The following relates to a sliding construction method by hydraulic thruster, in particular to an accumulative sliding construction method of segmental track-changing for unequal-span structure.
The degree of mechanization, automation and informatization of construction is one of the important indicators of the level of building construction technology in a country or region. Compared with the labor-intensive and extensive construction mode of traditional building production, mechanized construction is an effective way to improve engineering quality and reduce labor costs. For example, for construction environment with limited horizontal transportation or limited installation and utilization of hoisting machinery or vertical transportation equipment, accumulative sliding installation technology is often used for steel structure construction, which can greatly improve the construction environment, the construction efficiency, construction quality, and safety, and shorten the construction period with lower engineering cost.
However, the existing accumulative sliding construction methods mostly apply to regular structures. Traditional accumulative sliding construction technology is not applicable for unequal-span structure, as the sliding track couldn't match various intervals of the sliding shoes or the sliders arranged on each sliding main truss/beam. Considering above defects, extensive, labor-intensive and low-tech construction mode such as high-altitude spread operation method is still used for current construction of unequal-span steel structure, which is time-consuming and laborious, and not easy to ensure the construction quality and safety.
The prosperous construction market in China has become the largest construction market in the world due to the rapid development of social economy and the acceleration of urbanization. With the improvement of people's material life, the pursuit of spiritual and cultural life and the improvement of aesthetic taste, higher requirements are also put forward for the modeling and artistic expression of buildings. A large number of buildings present unequal-span, complex structural forms. Thus, a new mechanized sliding construction technology is proposed and studied in order to transform the large-scale, labor-intensive and extensive backward construction production mode in China.
An aspect relates to an accumulative sliding construction method of segmental track-changing for unequal-span structure. The application solves the sliding construction problem of the unequal-span structure with large span alteration.
The present application discloses an accumulative sliding construction method of segmental track-changing for unequal-span structure, which is suitable for unequal-span structure including at least three main trusses/beams with different spans, and the construction method comprises the following steps:
Step 1, designing a sliding track; dividing the unequal-span structure into at least two sliding sections and an individual truss/beam according to structural span variation, wherein each sliding section comprises a sliding main truss/beam and a set of secondary trusses/beams connected;
the sliding track is designed into a plurality of parallel track segments, the number of the track segments is equal to the number of the sliding zone blocks, each track segment is offset from the adjacent track segment by a certain distance, and the certain distance is respectively corresponding to the span differentials between every two adjacent main trusses/beams;
Step 2, analyzing the sliding process of the unequal-span structure; the weight of the sliding structure and the track layout, the specification, quantity and layout of the sliding hydraulic thrusters are determined;
Step 3, installing the track segments and an assembly platform; installing the track segments are arranged according to the design of Step 1, and the assembly platform used to assemble the structure is mounted to a first track segment, wherein the first track segment extends onto the assembly platform;
Step 4, sliding process begins; a first main truss/beam assembled on the assembly platform, and pushed away from the assembly platform by a set of hydraulic thrusters, wherein at least one assembled temporary auxiliary device for anti-overturning is arranged for preventing the first main truss/beam from overturning during the sliding process;
after the first main truss/beam leaving the assembly platform, a second main truss/beam is assembled on the assembly platform, and at least one set of secondary trusses/beams between the sliding main truss/beam and the second main truss/beam to form a first sliding section, then the assembled temporary auxiliary device for anti-overturning is detached;
Step 5, track-changing process; pushing the sliding section and the second main truss/beam in the fourth step 4 forward by the hydraulic thrusters until the first main truss/beam reaches a position where the first track segment and its adjacent track segment, a second track segment overlaps;
due to different track gauges of the track segments, each main truss/beam is provided with at least one slider at positions corresponding to track gauges of the track segments that the main truss/beam slides through ensuring the main truss/beam leaves the first track segment and slides on the second track segment to perform a track-changing process.
According to one aspect of the construction method of the present application, as the span of the main truss/beam is smaller than the track gauge of the track segment which it engages with, the both ends of main truss/beam are attached with assembled temporary lengthening auxiliary structure. The span of the main truss/beam is enlarged to the track gauge between the track segments for engaging with the track segments.
According to an aspect of the construction method of the present application, the assembled temporary lengthening auxiliary structure includes a plurality of sub-units, the length of each sub-unit is determined by the differential of the track gauges between two adjacent track segments of the track segments.
According to an aspect of the construction method of the present application, as the sliding main truss/beam passes one of the track segments, the sub-units corresponding to the one of the track segments are removed.
According to an aspect of the construction method of the present application, as the span of the main truss/beam is larger than the track gauge of the track segment which the main truss/beam engages with, the main truss/beam is divided into the initial sliding unit and the rear-mounted units which that are installed at both ends of the initial sliding unit, wherein the span of the initial sliding unit is equal to the track gauge of the track segment. Therefore, the initial sliding unit smoothly slides at the first track segments.
According to an aspect of the construction method of the present application, the rear-mounted units comprise a plurality of sub-units, the length of each sub-unit corresponding to differences in track gauges of two adjacent track segments of the track segments, as the main truss/beam passes one of the track segments and switches to another track segment with different track gauge, the subsequent sub-units are assembled so that the spans thereof are adapted to slide on the subsequent track segments.
According to an aspect of the construction method of the present application as the sliding main truss/beam passes one of the track segments, the sub-units corresponding to the next one of the track segments could be mounted so as to continue the sliding process on the subsequent track segments.
According to an aspect of the construction method of the present application folding hinges are used for mounting the rear-mounted unit to the initial unit, as well as connection between sub-units of the rear-mounted units, and as the sliding main truss/beam passes one of the track segments, the sub-units corresponding to the next one of the track segments are unfolded. Thus, all the rear-mounted units are installed initially, and the corresponding sub-units are opened when the track segments are switched.
According to an aspect of the construction method of the present application, the connections between the main truss/beam and the assembled temporary lengthening auxiliary structure, the connections between the initial sliding unit and the rear-mounted unit, the connections between the sub-units of the assembled temporary lengthening auxiliary structure, and the connections between the sub-units of the rear-mounted unit are formed by channel steels and high strength bolts, which facilitates the installation.
According to an aspect of the construction method of the present application, in Step 4 of the construction method, before pushing the first main truss/beam to slide, the assembled temporary auxiliary device for anti-overturning is arranged in the front and rear of the first main truss/beam.
The assembled temporary auxiliary device for anti-overturning is L-shaped or triangular welded by section steel or steel plate. One end of the assembled temporary auxiliary device for anti-overturning is temporarily fixed with the main truss/beam through bolts, and the other end of the assembled temporary auxiliary device for anti-overturning is arranged on the sliding track segments. Sliders are arranged between the assembled temporary auxiliary device for anti-overturning and the sliding track segments ensure the relative sliding smoothness between the two. The first set of hydraulic thrusters is mounted on the main truss/beam and propels the sliding main truss/beam to a predetermined position.
According to an aspect of the construction method of the present application, In order to the facilitation of the track-changing process, the prior track segments and the subsequent track segments could be provided with export free cuts and import free cuts, respectively, so that the sliding structure could switch between the track segments with different track gauges to continue to slide. As mentioned above, the length of the overlap of two adjacent track segments is long enough for removing and installing the hydraulic thrusters on the prior and subsequent track segments.
The segmental track-changing cumulative sliding construction method of unequal-span structure of the present application, not only solves the engineering problem that the traditional accumulative sliding construction method is difficult to implement on unequal-span structure, but also effectively alter the extensive, labor-intensive and low-technology-level construction mode that the unequal-span steel structure construction still largely adopts, such as the high-altitude bulk method and the like. The method overcomes the defects of construction method of the structure, such as time-consuming, labor-consuming, as well as the difficulty to guarantee the construction quality and safety. The mechanization and automation of construction is improved, and the construction period and cost are saved.
The present disclosure will be described hereinafter in details with reference to the figures and the embodiments, obviously, the figures to be described below are merely embodiments of the present disclosure. For those skilled in the art, other figures may be obtained according to these figures without any creative work.
In order that the objectives, technical solutions, and advantages of the present disclosure will become more apparent, specific embodiments of the present disclosure will be further described with reference to the accompanying drawings.
Embodiment 1 of the present application is shown in
When the sliding construction of the unequal-span structure is carried out by sliding from a side with larger-span to a side of smaller-span due to restriction of construction site conditions, the method of segmental track-changing for unequal-span structure includes the following steps.
(1) The sliding track is designed and arranged. As shown in
According to the division of the unequal-span structure, the sliding track is divided into three track segments 61, 62 and 63 with different track gauges. The track gauge of each track segment corresponds to the span of a sliding section, and the distances that each track segment offsets from its adjacent track segment in the span direction is shown as L1, L2, respectively.
(2) Based on the analysis of the whole process of accumulative sliding, the weight of the sliding structure and the track layout, the specification, quantity and layout of the sliding hydraulic thrusters 71, 72, 73 and 74 are determined, as shown in
(3) The track segments and assembly platform are installed. As shown in
The track segment 63 may extend onto the assembly platform as desired, as shown in
(4) The sliding process begins. As shown in
The first set of hydraulic thrusters 71 could be installed on the first main truss/beam 21 after the installation of the first main truss/beam 21 and the assembled temporary lengthening auxiliary structure 212, and then the first set of hydraulic thrusters 71 controlled by a computer control system is employed to push the first main truss/beam 21 to travel along the track segments 63.
(5) Track-changing process begins: track-changing process is required when the sliding structure, for example the first main truss/beam 21 is switched between the track segments due to different track gauges of track segments 61-63.
As shown in
1. The first main truss/beam 21, which is of the minimum span length, needs to slide through all three track segments 63, 62 and 61 in sequence. As shown in
The length of the assembled temporary lengthening auxiliary structure 212 is determined by differentials of the track gauges of the track segments 61, 62 and 63, which is shown as L1+L2 in
2. As shown in
3. The sets of hydraulic thrusters 71, 72 controlled by the computer control system is employed to push the first sliding section to advance until the first main truss/beam 21 reaches an overlap portion of two adjacent track segments, which is shown as the overlap portion of track segments 63 and 62 in
4. Then the first set of hydraulic thrusters 71 could be removed from the track segments 63 and installed at the track segments 62; and the sub-unit of length L2 of the assembled temporary lengthening auxiliary structure 212 for sliding on the track segments 63 could be removed. Afterwards, the first sliding section is pushed forward by the sets of hydraulic thrusters 71 and 72 controlled by the computer control system, and the track-changing process of the first main truss/beam 21 is completed by through the sliders 91 arranged on the first main truss/beam 21, as shown in
As mentioned above, the overlap is long enough for removing the hydraulic thrusters from prior track segments and installing the hydraulic thrusters on the subsequent track segments. To facilitate the track-changing process, the prior track segments and the subsequent track segments could be provided with export free cuts and import free cuts, respectively, to facilitate detaching the slider 91 from the track segments 63 and engaging with the track segments 62.
(6) Accumulative sliding is implemented. The second main truss/beam is assembled on the assembly platform 8 and then it is connected with the first sliding main truss/beam by the secondary truss/beam therebetween according to design requirements to form a whole, after that respective set of hydraulic thrusters could be arranged. With reference to the method of substeps 3 and 4 of step (5), the assembly process and the track-changing sliding for the second and third sliding trusses/beams are sequentially completed. The fourth main truss/beam 24 is installed when all three sliding sections are in position, and the installation of the whole structure is completed, as shown in
In the present embodiment, as shown in
After the first main truss/beam 21 and the second main truss/beam 22 are integrally connected, the assembled temporary auxiliary device for anti-overturning 13 arranged for the first main truss/beam 21 can be removed.
As shown in
The structure of the slider 91 is shown in detail in
Embodiment 2 of the present application is shown in
When the unequal-span roof or floor structure in the first embodiment shown in the
(1) The sliding track is designed and arranged. As shown in
The track segments, the track beam, the track beam support structure, the sliders 91, and the connection between the sliders 91 and the sliding main trusses/beams are same as those in the first embodiment, as shown in
(2) Based on the analysis of the whole process of accumulative sliding, the weight of the sliding structure and the track layout, the specification, quantity and layout of the sliding hydraulic thrusters 71, 72, 73 and 74 are determined, as shown in
(3) The track segments and assembly platform are installed. As shown in
(4) The first main truss/beam is pushed to slide initially.
1. Initial sliding is prepared. The first main truss/beam 24 is divided into an initial sliding unit 24a and rear-mounted units. The span of initial sliding unit 24a matches the track gauge of the track segments 63. The rear-mounted unit is divided into a plurality of sub-units, the length of each sub-unit is determined by the differential between the track gauges of two adjacent track segments, as shown in
2. The assembled temporary auxiliary device for anti-overturning 13 and the first set of hydraulic thruster 71 are arranged at the front and rear of the initial sliding unit 24a in its sliding direction, as shown in
(5) The track-changing process for each sliding section is performed. The sliding process of each sliding section is analyzed and the tracks that each sliding section successively slides through are determined, then the sliders 91 could be arranged at corresponding positions of the initial sliding unit 24a and the rear-mounted unit for track-changing between track segments with different track gauges. Taking the first sliding main truss/beam 24 as an example:
1. The first main truss/beam 24, which is of the largest span length, needs to slide through all three track segments 63, 62 and 61 in sequence. As shown in
2. The initial sliding unit 24a is assembled on the assembly platform 8 together with corresponding sliders 91 and the first set of hydraulic thrusters 71, as shown in
3. The sets of hydraulic thrusters 71 and 72 is controlled by the computer control system to push the sliding section containing the initial sliding unit 24a forward until the initial sliding unit 24a reaches the overlap portion of the track segments, which is shown as the overlap portion of track segments 63 and 62 in
4. Rear-mounted units 24b with length of L1, which is corresponding to the track gauge between the track segments 62 and the track segments 63, are assembled at both ends of the initial sliding unit 24a. The first set of hydraulic thrusters 71 is removed from the track segments 63 and installed at the track segments 62, as shown in
Preferably, the sub-units 24B and 24C of the rear-mounted unit may be pre-connected to the initial sliding unit 24a by dedicated hinges 27, when sliding through a track segments with smaller track gauges, the subunits could be folded, as shown in
The overlap is long enough for removing the hydraulic thrusters from prior track segments and installing the hydraulic thrusters on the subsequent track segments. To facilitate the track-changing process, the prior track segments and the subsequent track segments could be provided with export free cuts and import free cuts, respectively, to facilitate detaching the slider 91 from the track segments 63 and to engage with the track segments 62.
(6) Accumulative sliding is implemented. The second sliding main truss/beam is assembled on the assembly platform 8 and then it is connected with the first sliding main truss/beam by the secondary truss/beam therebetween according to design requirements to form a whole, after that respective set of hydraulic thrusters could be arranged. With reference to the method of substeps 3 and 4 of step (5), the assembly process and the track-changing sliding for the second and third sliding trusses/beams could be sequentially completed. The fourth sliding main truss/beam 21 could be installed when all three sliding sections are in position, and the installation of the whole structure is completed, as shown in
The above embodiments describe the sliding construction for unequal-span structure comprising four main trusses/beams with different spans and three sets of secondary trusses/beams. In actual construction, the method can be applied to sliding construction for unequal-span structure including different numbers of main trusses/beams with different spans. For example, for the unequal-span structure whose number of main trusses/beams with different spans is n, to apply sliding construction according to the present application, the number of track segments could be n−1, and the number of hydraulic thrusters, etc. could be n.
This application claims priority to PCT Application No. PCT/CN2020/077990, having a filing date of Mar. 5, 2020, the entire contents of which are hereby incorporated by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2020/077990 | 3/5/2020 | WO | 00 |