GRID STRUCTURE DISMANTLING METHOD

Abstract

A grid structure dismantling method is disclosed. The grid structure includes a plurality of rod member groups and a plurality of upright posts, the plurality of rod member groups include a first rod member group and a second rod member group, the first rod member group is connected to the second rod member group, and the plurality of upright post are connected to the second rod member group. The grid structure dismantling method includes: identifying a plurality of key rod member groups from the plurality of rod member groups, with each of the key rod member groups corresponding to a respective one of the upright posts; and dismantling all key rod members in each of the plurality of key rod member groups to make the grid structure collapse.

Description

TECHNICAL FIELD

The present disclosure relates to the technical field of grid structure dismantling, and in particular, to a grid structure dismantling method.

BACKGROUND

In related art, a blasting dismantling method and a reverse dismantling method are usually used to dismantle a grid structure. The blasting dismantling method requires a use of explosives which requires a certain approval process, resulting in prolonged construction period, and the use of explosives is noisy and uncontrollable, having certain safety risks. Moreover, the reverse dismantling method requires a use of supporting devices for assistance, resulting in high dismantling costs. Moreover, this method requires reverse dismantling of all rod members of the grid structure, necessitating long-time high-altitude operations by workers, which is cumbersome and time-consuming. Therefore, it is necessary to study and improve the grid structure dismantling method in response to the above problems.

SUMMARY

The present disclosure aims to solve at least one of the technical problems existing in the related art. To this end, a grid structure dismantling method is proposed herein, which can make the grid structure collapse by dismantling a portion of rod members of the grid structure, thus dismantling the grid structure.

According to the grid structure dismantling method of a first aspect of an embodiment of the present disclosure, the grid structure includes a plurality of rod member groups and a plurality of upright posts, the plurality of rod member groups include a first rod member group and a second rod member group, the first rod member group is connected to the second rod member group, and the plurality of upright posts is connected to the second rod member group. The grid structure dismantling method includes:

• • identifying a plurality of key rod member groups from the plurality of rod member groups, with each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts; and
  • dismantling all key rod members in each of the plurality of key rod member groups to make the grid structure collapse.

The grid structure dismantling method according to an embodiment of the present disclosure has at least following beneficial effects. Compared with traditional blasting dismantling and reverse dismantling methods, the grid structure dismantling method of the present disclosure is shorter in dismantling period, and the grid structure can be rapidly collapsed only by determining key rod member groups of the grid structure in advance, dismantling the corresponding key rod member groups during construction and damaging main support points of the grid structure, thus achieving a purpose of dismantling the grid structure. In addition, when the key rod member groups are dismantled, there is no need to use additional supporting devices, reducing construction costs.

According to some embodiments of the present disclosure, the identifying includes: simulating and analyzing dismantling of the grid structure with finite element analysis software; and identifying each of the plurality of key rod member groups respectively based on a stress change of at least one of non-dismantled rod members during a dismantling process.

According to some embodiments of the present disclosure, two adjacent upright posts are selected to be a first upright post and a second upright post, respectively, where the dismantling includes:

• • dismantling all rod members of a key rod member group corresponding to the first upright post;
  • dismantling all rod members of a key rod member group corresponding to the second upright post, so that portions of the grid structure corresponding to the first upright post and the second upright post collapse; andwhere above steps are repeated until the grid structure completely collapses.

According to some embodiments of the present disclosure, the grid structure includes a rectangular square pyramid grid structure, and the key rod member group corresponding to the second upright post includes a first key rod member, a second key rod member, and a third key rod member.

According to some embodiments of the present disclosure, the simulating includes:

• • a first round of simulation, in which, on a basis of dismantling all rod members of the key rod member group corresponding to the first upright post, stress changes of the at least one of non-dismantled rod members of the second rod member group which is connected to the second upright post are successively simulated and analyzed after each single rod member of the second rod member group which is connected to the second upright post is dismantled, and after being dismantled, a rod member that results in a greatest stress change of the at least one of non-dismantled rod members of the second rod member group which is connected to the second upright post is determined as the first key rod member;
  • a second round of simulation, in which, on a basis of dismantling the first key rod member, the stress changes of the at least one of non-dismantled rod members of the second rod member group which is connected to the second upright post are further successively simulated and analyzed after each single rod member of the second rod member group which is connected to the second upright post is dismantled, and after being dismantled, a rod member that results in a greatest stress change of the at least one of non-dismantled members of the second rod member group which is connected to the second upright post is determined as the second key rod member; and
  • repeating above simulating and analyzing processes until the grid structure partially collapses, thereby identifying all key rod members included in the key rod member group corresponding to the second upright post.

According to some embodiments of the present disclosure, the grid structure includes a rectangular square pyramid grid structure, the second rod member group includes a plurality of web rods, each of the plurality of upright posts is connected to a plurality of corresponding web rods respectively, and all key rod members of each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts are all the corresponding web rods which are connected to the respective one of the plurality of upright posts.

According to some embodiments of the present disclosure, the grid structure includes a rectangular square pyramid grid structure, the second rod member group includes a plurality of web rods, each of the plurality of upright posts is connected to a plurality of corresponding web rods respectively, and all key rod members of each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts are all the corresponding web rods which are connected to the respective one of the plurality of upright posts, and the plurality of upright posts include a first upright post, a second upright post, and a third upright post, where the first upright post is adjacent to the second upright post, and the second upright post is adjacent to the third upright post. The dismantling includes:

• • dismantling all corresponding web rods connected to the first upright post;
  • retaining at least one of the corresponding web rods connected to the second upright post, and dismantling other web rods connected to the second upright post except the at least one of the corresponding web rods which is retained;
  • dismantling all corresponding web rods connected to the third upright post; and
  • dismantling the at least one of the web rods retained at the second stand.

According to some embodiments of the present disclosure, the grid structure includes a rectangular square pyramid grid structure, the second rod member group includes a plurality of web rods, each of the plurality of upright posts is connected to a plurality of corresponding web rods, a key rod member group corresponding to each of the plurality of upright posts respectively comprises a plurality of corresponding web rods connected to a respective one of the plurality of upright posts, the plurality of upright posts include a first upright post, a second upright post, a third upright post, and a fourth upright post, and the first upright post, the second upright post, the third upright post and the fourth upright post are arranged in sequence at four corners of a rectangle. The dismantling includes:

• • dismantling all corresponding web rods connected to the first upright post;
  • retaining at least one of the corresponding web rods connected to the second upright post, and dismantling other web rods connected to the second upright post except the at least one of the corresponding web rods which is retained;
  • dismantling all corresponding web rods connected to the third upright post; and
  • dismantling all corresponding web rods connected to the fourth upright post.

According to some embodiments of the present disclosure, the grid structure dismantling method further includes: breaking roof panels around the plurality of upright posts and around the plurality of rod member groups before dismantling the plurality of the key rod member groups.

According to some embodiments of the present disclosure, the grid structure dismantling method further includes: preparing a lifting device to allow a person to be hoisted in air to dismantle the plurality of key rod member groups before dismantling the plurality of key rod member groups.

Additional aspects and advantages of the present disclosure will be set forth in part in the following description, and in part will be obvious from the description, or may be learned by practice of the present disclosure.

BRIEF DESCRIPTION OF DRAWINGS

The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments, in which

FIG. 1 is a schematic diagram of a grid structure according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the grid structure in FIG. 1 from another perspective;

FIG. 3 is a flowchart of a grid structure dismantling method according to a first aspect of an embodiment of the present disclosure;

FIG. 4 is a flowchart of identifying according to an embodiment of the present disclosure;

FIG. 5 is a flowchart of dismantling according to an embodiment of the present disclosure;

FIG. 6 is a flowchart of simulating according to an embodiment of the present disclosure;

FIG. 7 is a flowchart of the dismantling according to another embodiment of the present disclosure; and

FIG. 8 is a flowchart of the dismantling according to yet another embodiment of the present disclosure.

REFERENCE NUMERALS

• • grid structure 100, upper chord 110, first rod member group 120, lower chord 130, web rod 140, second rod member group 150, upright post 160;
  • first upright post 200, second key rod member 210, third key rod member 220, first key rod member 230, second upright post 240, third upright post 250, fourth upright post 260.

DETAILED DESCRIPTION

Embodiments of the present disclosure are described in detail below, examples of the embodiments are illustrated in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are merely used to explain the present disclosure, which are not to be understood as limiting the present disclosure.

In the description of the present disclosure, it is to be understood that, referring to orientation description, the instructed orientations or positional relationships, for example, upper, lower, front, rear, left, right, etc., are based on the orientations or positional relationships shown in the accompanying drawings, merely for ease of description of the present disclosure and simplification for the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, which, therefore, are not to be construed as limiting the present disclosure.

In the description of the present disclosure, “several” refers to more than one; “a plurality of” refers to two or more; “greater than”, “less than”, “over” and the like are understood as excluding the number referred to; and “above”, “below”, “within” and the like are understood to include the number referred to. If described, “first” and “second” are merely for a purpose of distinguishing technical features, and not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence relationship of indicated technical features.

In the description of the present disclosure, unless otherwise explicitly limited, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine specific meanings of the above words in the present disclosure in combination with a specific content of the technical scheme.

In the description of the present disclosure, description of reference terms “one embodiment”, “some embodiments”, “illustrative embodiments”, “examples”, “specific examples”, or “some examples” etc. means that specific features, structures, materials, or characteristics combined with the embodiments or descriptions of the examples are contained in at least one embodiment or one example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

The grid structure dismantling method according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings of the specification.

Referring to FIGS. 1 and 3, according to a grid structure dismantling method of a first aspect of an embodiment of the present disclosure, the grid structure 100 includes a plurality of rod member groups and a plurality of upright posts 160. The plurality of rod member groups include a first rod member group 120 and a second rod member group 150. The first rod member group 120 is connected to the second rod member group 150, and each of the plurality of upright posts 160 is connected to the second rod member group 150 respectively. The grid structure dismantling method includes:

• • S100, identifying a plurality of key rod member groups from the plurality of rod member groups, with each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts 160; and
  • S200, dismantling all key rod members in each of the plurality of key rod member groups to make the grid structure 100 collapse.

Specifically, the plurality of upright posts 160 provide main structural supports for the grid structure 100. One end of each of the plurality of upright posts 160 is fixed to ground respectively, and another end of each of the plurality of upright posts 160 is connected to some rod members of the second rod member group 150 respectively. A plurality of rod members of the first rod member group 120 support a roof, and the second rod member group 150 is connected to the first rod member group 120 to provide support force for the first rod member group 120.

In step S100, the rod member groups are first identified and the plurality of key rod member groups are selected from the rod member groups. Since a support of the rod member groups depends on the upright posts 160, a rod member of each of the key rod member groups is a rod member which is connected to a responding one of the upright posts 160. Therefore, each of the upright posts 160 has a corresponding one of the plurality of key rod member groups. A method for identifying the key rod member groups can be selected as analysis by simulation software or mechanical analysis by mathematical methods.

In step S200, the key rod members of the identified key rod member groups are dismantled, and main support points of the grid structure 100 are destroyed, thereby causing the grid structure 100 to collapse under sudden stress changes. When the key rod members of all key rod member groups are dismantled, an overall collapse and dismantling of the grid structure 100 can be realized.

Compared with traditional blasting dismantling and reverse dismantling methods, the grid structure dismantling method of the present disclosure has a shorter dismantling period, and the grid structure 100 can rapidly collapse merely by determining key rod member groups of the grid structure 100 in advance and dismantling corresponding key rod member groups during construction, thereby achieving a purpose of grid structure 100 dismantling. In addition, when the key rod member groups are dismantled, there is no need to use additional supporting devices, thus reducing construction costs.

Referring to FIG. 4, according to some embodiments of the present disclosure, the identifying further includes: S110, simulating and analyzing the dismantling of the grid structure with finite element analysis software; and identifying each of the plurality of key rod member groups based on a stress change of at least one of non-dismantled rod members during a dismantling process.

Specifically, after one rod member is dismantled, a stress of another rod member which is not dismantled changes accordingly. When stresses of all other rod members change greatly, it means that the dismantled one rod member is a rod member that provides greater support force, and the dismantled one rod member is marked as a key rod member of a corresponding one of the key rod member groups. A process of dismantling one of the rod members and comparing stress changes of other non-dismantled rod members is repeated until a certain number of rod members are dismantled and the grid structure 100 collapses. At this time, all the dismantled rod members are the key rod members of the corresponding one of the key rod member groups.

Referring to FIGS. 2 and 5, according to some embodiments of the present disclosure, two adjacent upright posts 160 are selected to be a first upright post 200 and a second upright post 240, respectively. The dismantling includes:

• • S210, dismantling all rod members of a key rod member group corresponding to the first upright post 200;
  • S220, dismantling all rod members of a key rod member group corresponding to the second upright post 240, so that portions of the grid structure 100 corresponding to the first upright post 200 and the second upright post 240 collapse; and
  • S230, repeating above steps until the grid structure 100 completely collapses.

Specifically, in step S210, after all key rod members of the key rod member group corresponding to the first upright post 200 are dismantled, due to a pull of the rod members of the second upright post 240, no collapse occurs even though the rod member group of the first upright post 200 is subjected to a stress change. After all rod members of the key rod member group corresponding to the second upright post 240 are dismantled in step S220, pulling force of the rod members of the second upright post 240 to the rod members of the first upright post 200 is reduced, and the rod member group of the first upright post 200 experiences a sudden stress change and begins to collapse. At the same time, the rod member group of the second upright post 240 collapses synchronously under a pull of the rod member group of the first upright post 200, thereby realizing the collapse of the portions of the grid structure 100 corresponding to the first upright post 200 and the second upright post 240. In step S230, a dismantling operation of two adjacent upright posts 160 is repeated, so as to achieve a purpose of a complete collapse of the grid structure 100.

Referring to FIG. 2, according to some embodiments of the present disclosure, the grid structure 100 includes a rectangular square pyramid grid structure 100, and the key rod member group corresponding to the second upright post 240 includes a first key rod member 230, a second key rod member 210, and a third key rod member 220.

Specifically, when the grid structure 100 is a rectangular square pyramid grid structure 100, after all rod members of the key rod member group corresponding to the first upright post 200 are dismantled, the first key rod member 230, the second key rod member 210 and the third key rod member 220 of the key rod member group corresponding to the second upright post 240 continue to be dismantled, so that the collapse of portions of the grid structure 100 corresponding to the first upright post 200 and the second upright post 240 can be achieved. In this embodiment, the collapse can be realized by dismantling a least number of key rod members, thus improving a dismantling efficiency.

Referring to FIGS. 2 and 6, according to some embodiments of the present disclosure, the simulating includes:

• • S111, a first round of simulation, in which, on a basis of dismantling all the rod members of the key rod member group corresponding to the first upright post, stress changes of at least one of non-dismantled rod members in the second rod member group connected to the second upright post are successively simulated and analyzed after each single rod member of the second rod member group which is connected to the second upright post is dismantled, and after being dismantled, a rod member that results in a greatest stress change in the at least one of non-dismantled members of the second rod member group which is connected to the second upright post is determined as the first key rod member 230;
  • S112, a second round of simulation, in which, on a basis of dismantling the first key rod member, stress changes of the at least one of non-dismantled rod members in the second rod member group which is connected to the second upright post are further simulated and analyzed successively after each single rod member of the second rod member group which is connected to the second upright post is dismantled, and after being dismantled, a rod member that results in a greatest stress change in the at least one of non-dismantled members of the second rod member group which is connected to the second upright post is determined as the second key rod member 210; and
  • S113, repeating above simulating and analyzing processes until a portion of the grid structure collapses, thereby identifying all the key rod members included in the key rod member group corresponding to the second upright post.

Based on above steps, in step S111, a rod member that provides maximum support force among the rod members connected to the second upright post 240 is identified as the first key rod member 230. In step S112, on the basis of dismantling the first key rod member 230, a rod member that provides maximum support force is identified as the second rod member. In step S113, the above simulation and analysis steps are repeated until the grid structure 100 collapses in a Nth round of simulation. At this time, the first key rod member 230, the second key rod member 210, etc., and the Nth key rod member included in the key rod member group corresponding to the second upright post 240 are obtained. By applying the simulation method of this embodiment, it can be concluded that when the grid structure 100 is the rectangular square pyramid grid structure 100, the key rod members of the key rod member group corresponding to the second upright post 240 are the first key rod member 230, the second key rod member 210, and the third key rod member 220.

Referring to FIGS. 1 and 2, according to some embodiments of the present disclosure, the grid structure 100 includes the rectangular square pyramid grid structure 100, the second rod member group 150 includes a plurality of web rods 140, each of the plurality of upright posts 160 is connected to a plurality of corresponding web rods 140, all key rod members of each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts 160 are all the corresponding web rods 140 which are connected to the respective one of the plurality of upright posts 140.

Specifically, when the grid structure 100 is the rectangular square pyramid grid structure 100, after analysis by finite element simulation software, it can be seen that in response to all the plurality of corresponding web rods 140 connected to two adjacent upright posts 160 being dismantled, the portions of the grid structure 100 corresponding to the two adjacent upright posts 160 collapses. Therefore, a collapse and dismantling of the grid structure 100 can be realized by dismantling all the plurality of corresponding web rods 140 connected to each of the upright posts 160.

Each of the plurality of rod member groups of the rectangular square pyramid grid structure 100 specifically includes a plurality of upper chords 110 and a plurality of lower chords 130. The web rods 140 are easier to be identified and distinguished than the upper chords 110 and the lower chords 130, which helps to improve a dismantling efficiency. In addition, collapse only occurs in response to all the plurality of corresponding web rods 140 connected to each of the two adjacent upright posts 160 being dismantled, so that a collapse timing is easy to control, which can effectively reduce possible safety hazards.

Referring to FIGS. 1, 2 and 7, according to some embodiments of the present disclosure, the grid structure 100 includes the rectangular square pyramid grid structure 100, the second rod member group 150 includes a plurality of web rods 140, each of the plurality of upright posts 160 is connected to a plurality of corresponding web rods 140, all key rod members of each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts 160 are all the corresponding web rods 140 which are connected to the respective one of the plurality of upright posts 140, and the plurality of upright posts 160 include a first upright post 200, a second upright post 240, and a third upright post 250, in which, the first upright post 200 is adjacent to the second upright post 240, and the second upright post 240 is adjacent to the third upright post 250.

The dismantling includes:

• • S240, dismantling all corresponding web rods 140 connected to the first upright post 200;
  • S245, retaining at least one of corresponding web rods 140 connected to the second upright post 240, and dismantling other corresponding web rods 140 connected to the second upright post except the at least one of the corresponding web rods 140 which is retained;
  • S250, dismantling all corresponding web rods 140 connected to the third upright post 250; and
  • S255, dismantling the at least one of corresponding web rods 140 retained at the second upright post 240.

Specifically, based on above steps, when the grid structure 100 is the rectangular square pyramid grid structure 100, in step S240, the grid structure 100 has not yet collapsed after all corresponding web rods 140 connected to the first upright post 200 are dismantled. In step S245, at least one of the corresponding web rods 140 connected to the second upright post 240 is retained. Sufficient pulling force is provided for corresponding rod members at the first upright post 200 by the at least one of the corresponding web rods 140 which is retained, such that the grid structure 100 does not collapse after a portion of the web rods 140 of the second upright post 240 are dismantled. In step S250, after all the corresponding web rods 140 connected to the third upright post 250 are dismantled, since the pulling force of the at least one of the corresponding web rods 140 retained at the second upright post 240 is still sufficient to maintain a stability of corresponding rod members at the third upright post 250, the grid structure 100 will not collapse. In step S255, after the at least one of the corresponding web rods 140 retained at the second upright post 240 is dismantled, the pulling force provided by the at least one of retained rod members disappears, and the other rod members are incapable of maintaining the stability, so that portions of the grid structure 100 corresponding to the first upright post 200, the second upright post 240 and the third upright post 250 collapse. The overall collapse of the grid structure 100 can be achieved by repeating the dismantling of this embodiment. By applying the dismantling step of this embodiment, the number of corresponding upright posts 160 in a single collapse can be increased and the number of collapses can be reduced.

Referring to FIGS. 1, 2 and 8, according to some embodiments of the present disclosure, the grid structure 100 includes the rectangular square pyramid grid structure 100, the second rod member group 150 includes a plurality of web rods 140, each of the plurality of upright posts 160 is connected to a plurality of corresponding web rods 140, a key rod member group corresponding to each of the plurality of upright posts 160 respectively includes a plurality of corresponding web rods 140 connected to a respective one of the plurality of upright posts 140, and the plurality of upright posts 160 include a first upright post 200, a second upright post 240, a third upright post 250, and a fourth upright post 260, in which, the first upright post 200, the second upright post 240, the third upright post 250 and the fourth upright post 260 are arranged in sequence along four corners of a rectangle. The dismantling includes:

• • S260, dismantling all corresponding web rods 140 connected to the first upright post 200;
  • S265, retaining at least one of corresponding web rods 140 connected to the second upright post 240, and dismantling other corresponding web rods 140 connected to the second upright post 240 except the at least one of the corresponding web rods 140 which is retained;
  • S270, dismantling all corresponding web rods 140 connected to the third upright post 250; and
  • S275, dismantling all corresponding web rods 140 connected to the fourth upright post 260.

Specifically, based on above steps, when the grid structure 100 is the rectangular square pyramid grid structure 100, in step S260, after all the corresponding web rods 140 connected to the first upright post 200 are dismantled, the grid structure 100 has not yet collapsed. In step S265, at least one of the corresponding web rods 140 connected to the second upright post 240 is retained. Sufficient pulling force is provided for corresponding rod members at the first upright post 200 by the at least one of the corresponding web rods 140 which is retained, such that the grid structure 100 does not collapse after a portion of the web rods 140 of the second upright post 240 are dismantled. In step S270, after all the corresponding web rods 140 connected to the third upright post 250 are dismantled, since the pulling force of the at least one of the web rods 140 retained at the second upright post 240 is still sufficient to maintain the stability of corresponding rod members at the third upright post 250, the grid structure 100 will not collapse. In step S275, after all the corresponding web rods 140 connected to the fourth upright post 260 are dismantled, since all web rods 140 of the fourth upright post 260 and the adjacent first upright post 200 are dismantled, and all web rods 140 of the fourth upright post 260 and of the adjacent third upright post 250 are dismantled, portions of the grid structure 100 corresponding to the first upright post 200, the third upright post 250 and the fourth upright post 260 collapse. Since the collapse of the first upright post 200, the third upright post 250 and the fourth upright post 260 causes a large deformation pulling to the entire grid structure 100, the pulling force of the at least one of the web rods 140 retained at the second upright post 240 is less than a force caused by the large deformation pulling, portions of the grid structure 100 corresponding to the second upright post 240 collapse synchronously under an action of the large deformation pulling, thereby realizing a synchronous collapse of the portions of the grid structure 100 corresponding to the first upright post 200, the second upright post 240, the third upright post 250, and the fourth upright post 260.

Taking the specific rectangular square pyramid grid structure 100 as an example, the rectangular square pyramid grid structure 100 includes a first upright post 200, a second upright post 240, a third upright post 250, and a fourth upright post 260. Each of the upright posts 160 is connected with four oblique web rods 140, respectively. First of all, four oblique web rods 140 of the first upright post 200 are dismantled. Secondly, three oblique web rods 140 of the second upright post 240 are dismantled. Then, four oblique web rods 140 of the third upright post 250 are dismantled. Finally, four oblique web rods 140 of the fourth upright post 260 are dismantled. At this time, the first upright post 200, the third upright post 250 and the fourth upright post 260 collapse first, and the second upright post 240 subsequently collapses under an action of an large deformation pulling of the first upright post 200, the third upright post 250 and the fourth upright post 260. With one collapse, the overall collapse and dismantling of the entire grid structure 100 is realized.

When the grid structure 100 is merely provided with four upright posts 160, that is, the first upright post 200, the second upright post 240, the third upright post 250 and the fourth upright post 260, the dismantling method of this embodiment can be used to realize a one-time collapse of the entire grid structure 100. When the grid structure 100 is provided with other upright posts 160 besides the first upright post 200, the second upright post 240, the third upright post 250 and the fourth upright post 260, the dismantling method of this embodiment can also effectively reduce the number of collapses and increase the collapsed area corresponding to the one-time collapse.

According to some embodiments of the present disclosure, the grid structure dismantling method further includes: breaking roof panels around the plurality of upright posts 160 and around the plurality of rod member groups before dismantling the key rod member groups.

Specifically, before the grid structure 100 is dismantled, roof panels of original building are often connected to the rod member groups. The roof panels have a certain weight and are prone to ejection and splashing after collapse. If the grid structure 100 collapses together with the roof panels, there will be a greater safety risk, and it is not conducive to a subsequent recovery of each rod member of the rod member groups. Therefore, before the key rod member groups are dismantled, dismantling the roof panels around the upright posts 160 and around the rod member groups is beneficial to subsequent dismantling operations and improves a safety factor of dismantling the grid structure 100.

According to some embodiments of the present disclosure, the grid structure dismantling method further includes: preparing a lifting device to allow a person to be hoisted in air to dismantle the plurality of key rod member groups before dismantling the key rod member groups.

Specifically, when collapsing, the grid structure 100 falls in a direction of gravity. If a hydraulic shearing vehicle is used to dismantle the rod members, the hydraulic shearing vehicle needs to be operated at a specific position to avoid being crushed by the hydraulic shearing vehicle, which brings a certain space restriction. Furthermore, when the grid structure 100 collapses, if not retracted in time, scissor arms of the hydraulic shearing vehicle may be easily hit by the rod members to cause damage. Since the rod members that need to be dismantled are located in air, an operator of the hydraulic shearing vehicle does not have a good working view.

A worker is hoisted in the air by the lifting device to carry out the dismantling operations of the key rod member groups, without too much space restriction. As long as the worker is located above the grid structure 100, injuries to the worker can be avoided when the grid structure 100 collapses. Moreover, the worker is more flexible when dismantling rod members and can more easily identify the key rod members that need to be dismantled, thereby improving the efficiency of the dismantling step.

The embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the above embodiments. Within a scope of knowledge possessed by those of ordinary skill in the art, various variations can be made without departing from the purpose of the present disclosure. In addition, the embodiments of the present disclosure and the features in the embodiments may be combined with each other without conflict.

Claims

1. A grid structure dismantling method, wherein the grid structure comprises a plurality of rod member groups and a plurality of upright posts, the plurality of rod member groups comprise a first rod member group and a second rod member group, the first rod member group is connected to the second rod member group, and each of the plurality of upright posts is connected to the second rod member group respectively; wherein the grid structure dismantling method comprises: identifying a plurality of key rod member groups from the plurality of rod member groups, with each of the plurality of key rod member groups corresponding to a respective one of the plurality of upright posts; anddismantling all key rod members in each of the plurality of key rod member groups to make the grid structure collapse.

2. The grid structure dismantling method of claim 1, wherein the identifying comprises: simulating and analyzing dismantling of the grid structure with finite element analysis software; and identifying each of the plurality of key rod member groups based on a stress change of at least one of non-dismantled rod members during a dismantling process.

3. The grid structure dismantling method of claim 2, wherein the dismantling comprises making the grid structure completely collapse by repetitively: selecting two adjacent upright posts from the plurality of upright posts to be a first upright post and a second upright post, respectively; wherein the dismantling comprises:dismantling all rod members of a key rod member group corresponding to the first upright post;dismantling all rod members of a key rod member group corresponding to the second upright post, so that portions of the grid structure corresponding to the first upright post and the second upright post collapse.

4. The grid structure dismantling method of claim 3, wherein the grid structure comprises a rectangular square pyramid grid structure, and the key rod member group corresponding to the second upright post comprises a first key rod member, a second key rod member, and a third key rod member.

5. The grid structure dismantling method of claim 4, wherein the simulating comprises: a first round of simulation, in which, on a basis of dismantling all the rod members of the key rod member group corresponding to the first upright post, stress changes of the at least one of non-dismantled rod members of the second rod member group which is connected to the second upright post are successively simulated and analyzed after each single rod member of the second rod member group which is connected to the second upright post is dismantled, and after being dismantled, a rod member that results in a greatest stress change of the at least one of non-dismantled rod members of the second rod member group which is connected to the second upright post is determined as the first key rod member;a second round of simulation, in which, on a basis of dismantling the first key rod member, stress changes of the at least one of non-dismantled rod members of the second rod member group which is connected to the second upright post are further successively simulated and analyzed after each single rod member of the second rod member group which is connected to the second upright post is dismantled, and after being dismantled, a rod member that results in a greatest stress change of the at least one of non-dismantled members of the second rod member group which is connected to the second upright post is determined as the second key rod member; andrepeating above simulating and analyzing processes until a portion of the grid structure collapses, thereby identifying all the key rod members included in the key rod member group corresponding to the second upright post.

6. The grid structure dismantling method of claim 1, wherein the grid structure comprises a rectangular square pyramid grid structure, the second rod member group comprises a plurality of web rods, each of the plurality of upright posts is connected to a plurality of corresponding web rods which form a respective one of the key rod member group corresponding to the each of the plurality of upright posts.

7. The grid structure dismantling method of claim 1, wherein the grid structure comprises a rectangular square pyramid grid structure, the second rod member group comprises a plurality of web rods, each of the plurality of upright posts is connected to a plurality of corresponding web rods which form a respective one of the key rod member group corresponding to the each of the plurality of upright posts, and the plurality of upright posts comprise a first upright post, a second upright post, and a third upright post; wherein the first upright post is adjacent to the second upright post, wherein the second upright post is adjacent to the third upright post; wherein the dismantling comprises: dismantling all corresponding web rods connected to the first upright post;retaining at least one of corresponding web rods connected to the second upright post, and dismantling other web rods connected to the second upright post except the at least one of the corresponding web rods which is retained;dismantling all corresponding web rods connected to the third upright post; anddismantling at least one of the web rods retained at the second upright post.

8. The grid structure dismantling method of claim 1, wherein the grid structure comprises a rectangular square pyramid grid structure, the second rod member group comprises a plurality of web rods, each of the plurality of upright posts is connected to a plurality of corresponding web rods which form a respective one of the key rod member group corresponding to the each of the plurality of upright posts, the plurality of upright posts comprise a first upright post, a second upright post, a third upright post, and a fourth upright post; and the first upright post, the second upright post, the third upright post and the fourth upright post are arranged in sequence at four corners of a rectangle; wherein the dismantling comprises: dismantling all corresponding web rods connected to the first upright post;retaining at least one of corresponding web rods connected to the second upright post, and dismantling other web rods connected to the second upright post except the at least one of the corresponding web rods which is retained;dismantling all corresponding web rods connected to the third upright post; anddismantling all corresponding web rods connected to the fourth upright post.

9. The grid structure dismantling method of claim 1, further comprising: breaking roof panels around the plurality of upright posts and around the plurality of rod member groups before dismantling the plurality of the key rod member groups.

10. The grid structure dismantling method of claim 1, further comprising: preparing a lifting device to allow a person to be hoisted in air to dismantle the plurality of key rod member groups before dismantling the plurality of key rod member groups.