Patent Application
20200024818
The present invention relates to the field of concrete support structures, in particular to a pulling-out device for a prefabricated concrete support wall.
A foundation pit support structure is used to ensure the safety of the construction of an underground major structure and the environment surrounding the foundation pit. Temporary retaining, reinforcement, protection, underground water control and other measures taken for the foundation pit are often used for foundation pit protection, slope protection engineering and the like.
After use of the foundation pit support structure, the foundation pit support structure needs to be pulled out of the foundation pit for the next cycle. For the existing concrete support walls, when they are pulled out, a clamping head of a pile drawing machine is used for clamping the head of the concrete support wall, and simultaneously, a vibrating machine for vibrating is employed. As the amplitude of the vibrating machine is increased, a lifting hook is tensed so as to slowly lift the concrete support wall, and the vibrating machine stops until a hoist can directly lift the concrete support wall. By using this pulling-out way, the top of the concrete support wall is prone to being damaged under the action of repeated hammering and pulling-out. Furthermore, the concrete support wall is tensed as a whole during pulling out, so that the concrete has poor tensile performance and is prone to being damaged.
The technical problem to be solved in the present invention is to provide a pulling-out device for a prefabricated concrete support wall, which can effectively prevent concrete from being damaged when the concrete support wall is pulled out and thus prolong the service life of the concrete support wall.
In order to solve the above technical problems, the following technical solution for the present invention is provided.
A pulling-out device for a prefabricated concrete support wall is provided, a vertical hollow tube is pre-buried in the prefabricated concrete support wall, the pulling-out device includes a pulling-out mechanism disposed in the hollow tube by penetration, the lower end of the pulling-out mechanism is fixedly arranged in the prefabricated concrete support wall and positioned at the lower end of the hollow tube, a first fixing device for tensing the pulling-out mechanism is arranged at the upper end of the pulling-out mechanism, and the first fixing device is not connected with the prefabricated concrete support wall.
Further, the pulling-out mechanism is a first steel stranded wire, the first fixing device includes a lifting beam, a first steel stranded wire clamp and a first anchor plate arranged between the upper end surface of the lifting beam and the first steel stranded clamp, the upper end of the first steel stranded wire passes through the lifting beam and is fixed at the upper end of the lifting beam through the first steel stranded wire clamp, and the lifting beam contacts the upper end surface of the prefabricated concrete support wall under the action of the first steel stranded wire.
Further, a first U-shaped protecting plate is arranged at the lower end of the lifting beam, the prefabricated concrete support wall is clamped in a U-shaped slot of the first U-shaped protecting plate, and a through hole for enabling the first steel stranded wire to pass through is formed in the first U-shaped protecting plate.
Further, the side surfaces of the U-shaped slot of the first U-shaped protecting plate are arc-shaped surfaces, the center of a circle of each arc-shaped surface is positioned on the outer side of the first U-shaped protecting plate, and stiffening ribs are arranged on the outer sides of the first U-shaped protecting plate.
Further, the pulling-out mechanism is a second steel stranded wire, a groove is formed in the upper end of the prefabricated concrete support wall, a second U-shaped protecting plate is arranged in the groove, the first fixing device includes a rectangular steel and a second steel stranded wire clamp, which are arranged at the upper end surfaces of the second U-shaped protecting plate and positioned in the groove, the upper end of the rectangular steel is open, a lifting hole is formed in the side wall of the rectangular steel, the second steel stranded wire clamp is arranged in the rectangular steel, the upper end of the second steel stranded wire passes through the second U-shaped protecting plate and the rectangular steel and is fixed to the rectangular steel through the second steel stranded wire clamp, and the rectangular steel contacts the end surface of the groove under the action of the second steel stranded wire.
Further, a second fixing device for fixing the first steel stranded wire or the second steel stranded wire is pre-buried at the lower end of the hollow tube positioned in the prefabricated concrete support wall, the second fixing device includes a second anchor plate positioned at the lower end of the hollow tube, and a third steel stranded wire clamp is arranged below the second anchor plate.
Further, a protecting steel plate is arranged at the bottom end of the prefabricated concrete support wall, and the second fixing device is connected with the protecting steel plate by welding.
Further, the protecting steel plate is detachably connected at the bottom end of the prefabricated concrete support wall, stiffening ribs extending to the interior of the prefabricated concrete support wall are arranged on the inner side of the protecting steel plate or concrete extending to the interior of the prefabricated concrete support wall is poured on the inner side of the protecting steel plate.
Further, the pulling-out mechanism is a steel boom, an external thread is arranged at the upper end of the steel boom, the first fixing device includes a sleeve provided with an internal thread, the lower end of the sleeve is in threaded connection with the upper end of the steel boom, and the upper end of the sleeve is in threaded connection with a lifting ring.
Further, a reserved hole which is coaxial and communicated with the hollow tube is formed in the upper end surface of the prefabricated concrete support wall, and the diameter of the reserved hole is larger than that of the hollow tube.
Compared with the prior art, the present invention has the following beneficial effects: When the pulling-out device for the prefabricated concrete support wall of the present invention is used for manufacturing the prefabricated concrete support wall, by pre-burying the vertical hollow tube in the prefabricated concrete support wall, enabling the pulling-out mechanism to pass through the hollow tube and fixing the lower end of the pulling-out mechanism in the prefabricated concrete support wall, the upper end of the pulling-out mechanism can be placed freely in the hollow tube and extends to the upper part of the prefabricated concrete support wall. When the prefabricated concrete support wall needs to be pulled out after use, the upper end of the pulling-out mechanism is fixed to the first fixing device, then the first fixing device is fixed to a hoist or a crane, and then the hoist or the crane is started to lift the prefabricated concrete support wall.
In the process of lifting the prefabricated concrete support wall by the pulling-out device for the prefabricated concrete support wall of the present invention, as the first fixing device is only fixedly connected with the upper end of the pulling-out mechanism but not actually fixedly connected with the prefabricated concrete support wall, when the hoist or the crane drives the first fixing device to go up, the first fixing device drives the pulling-out mechanism to go up, the pulling-out mechanism applies a pressure from the bottom to the top to the prefabricated concrete support wall at the bottom of the prefabricated concrete support wall, so that the prefabricated concrete support wall is pressed as a whole during pulling out, the stress is reasonable, the compressive strength of the concrete can be fully utilized, therefore, the concrete is effectively prevented from being damaged, and the service life and the cycling ratio of the prefabricated concrete support wall are improved.
In order to enable the technical problems, technical solutions, and advantages of the present invention to be clearer, the present invention will be described below in detail in conjunction with the drawings and the specific embodiments.
The present invention provides a pulling-out device for a prefabricated concrete support wall, as shown in
When the pulling-out device for the prefabricated concrete support wall of the present invention is used for manufacturing the prefabricated concrete support wall 1, by pre-burying the vertical hollow tube 1-1 in the prefabricated concrete support wall 1, passing the pulling-out mechanism through the hollow tube 1-1 and fixing the lower end of the pulling-out mechanism in the prefabricated concrete support wall 1, the upper end of the pulling-out mechanism can be placed freely in the hollow tube 1-1 and extends to the upper part of the prefabricated concrete support wall 1.When the prefabricated concrete support wall 1 needs to be pulled out after use, the upper end of the pulling-out mechanism is fixed to the first fixing device 4, then the first fixing device 4 is fixed to a hoist or a crane, and then the hoist or the crane is started to lift the prefabricated concrete support wall 1.
In the process of lifting the prefabricated concrete support wall 1 by the pulling-out device for the prefabricated concrete support wall of the present invention, as the first fixing device 4 is only fixedly connected with the upper end of the pulling-out mechanism and not actually fixedly connected with the prefabricated concrete support wall 1, when the hoist or the crane drives the first fixing device 4 to go up, the first fixing device 4 drives the pulling-out mechanism to go up, the pulling-out mechanism applies the pressure from the bottom to the top to the prefabricated concrete support wall 1 at the bottom of the prefabricated concrete support wall 1, so that the prefabricated concrete support wall 1 is pressed as a whole during pulling out, the stress is reasonable, the compressive strength of the concrete can be fully utilized, the concrete is effectively prevented from being damaged, and the service life and the cycling ratio of the prefabricated concrete support wall 1 are improved.
In the present invention, the pulling-out mechanism can adopt the structural form of the steel stranded wire or the steel boom, and several embodiments of the pulling-out are given as follows:
As shown in
In the above Embodiment 1, in order to further prevent the lifting beam 4-2 at the lifting point from being partially damaged, a first anchor plate 4-4 can also be arranged between the upper end surface of the lifting beam 4-2 and the first steel stranded wire clamp 4-1 to increase the contact area between the first steel stranded wire clamp 4-1 and the lifting beam 4-2.
In the above embodiment 1, in the process of pulling out the prefabricated concrete support wall 1, in order to prevent the lifting beam 4.2 from rotating relative to the prefabricated concrete support wall 1 and further affecting the pulling out of the prefabricated concrete support wall 1, a first U-shaped protecting plate 4-3 is preferably arranged at the lower end of the lifting beam 4-2, the prefabricated concrete support wall 1 is clamped in a U-shaped slot of the first U-shaped protecting plate 4-3, and a through hole 4-3-1 is formed in the first U-shaped protecting plate 4-3 for enabling the first steel stranded wire 2 to pass through. As shown in
The first U-shaped protecting plate 4-3 can also be connected with the side surfaces of the prefabricated concrete support wall 1 by adopting bolts to further prevent the lifting beam 4-2 from rotating, wherein internal thread sleeves 1-3 for connecting with the bolts are pre-buried in the side surfaces of the prefabricated concrete support wall 1, a long circular hole 4-3-2 in the vertical direction is formed in the first U-shaped protecting plate 4-3, and the long circular hole is used for preventing the lifting beam 4-2 from being stressed during lifting.
In addition, lifting lugs 4-7 for lifting can also be welded on the lifting beam 4-2.
Preferably, in the above Embodiment 1, as shown in
As shown in
As shown in
As shown in
In the above Embodiment 1 and Embodiment 2, in order to reinforce the connection strength between the first steel stranded wire 2 or the second steel stranded wire 2′ and the prefabricated concrete support wall 1, a second fixing device 3 for fixing the first steel stranded wire 2 or the second steel stranded wire 2′ is preferably pre-buried at the lower end of the hollow tube 1-1 positioned in the prefabricated concrete support wall 1, the second fixing device 3 includes a second anchor plate 3-1 positioned at the lower end of the hollow tube 1-1, and a third steel stranded wire clamp 3-2 is arranged below the second anchor plate 3-1.
In addition to adopting the above structure as the second fixing device 3, those skilled in the art can select other steel stranded wire end fixing devices meeting the above principles, for example, a lifting ring is pre-buried in the prefabricated concrete support wall 1, and the lower end of the first steel stranded wire 2 or the second steel stranded wire 2′ is fixed to the lifting ring, while the implementation of the technical scheme of the present invention will not be affected.
In the above Embodiments 1-4, a protecting steel plate 1-2 is preferably arranged at the bottom end of the prefabricated concrete support wall 1, wherein, in Embodiments 1 and 2, as shown in
As an improvement of the above Embodiments 1-3, the protecting steel plate 1-2 is preferably detachably connected at the bottom end of the prefabricated concrete support wall 1.As shown in
The protecting steel plate 1-2 mainly relies on extrusion and friction with the prefabricated concrete support wall 1 and anti-shearing capacity of the countersunk head screw 7 when the prefabricated concrete support wall 1 is hammered into the soil, and stiffening ribs can be arranged in the protecting steel plate 1-2 or the concrete is filled in the protecting steel plate 1-2 to prevent damage to the protecting steel plate.
The protecting steel plate 1-2 can be divided into two parts, wherein a detachable part is only arranged in the position corresponding to the first steel stranded wire clamp 3-2 on the prefabricated concrete support wall 1, an undetachable part is positioned in another position at the bottom of the prefabricated concrete support wall 1, and a rabbet is arranged at the joint of the detachable part and the undetachable part for flushing the surfaces of the two.
Further, in the above Embodiments 1 and 4, as shown in
In Embodiment 1, in order to prevent the first steel stranded wire 2 from retracting into the hollow tube 1-1 during the use of the prefabricated concrete support wall 1, an end socket 8 can be arranged at the top end of the first steel stranded wire 2, and the end socket 8 is placed in the reserved hole 1-5. When the prefabricated concrete support wall 1 is pulled out by the first steel stranded wire 2, after the steel stranded wire 2 is pulled out through the end socket 8, the end socket 8 can be detached from the steel stranded wire 2 and the steel stranded wire 2 can be fixed to the second steel stranded wire clamp 4-1. As shown in
In Embodiment 3, the lower end of the sleeve 4-1″ can extend into the reserved hole 1-5 to be in threaded connection with the steel boom 2″, and the upper end of the sleeve 4-1″ extends out of the reserved hole 1-5 to be in threaded connection with the lifting ring 4-2″, so that the lifting ring 4-2″ is positioned above the prefabricated concrete support wall 1 to facilitate the connection between the lifting ring 4-2″ and the hoist or the crane.
It should be noted that, in the present invention, the first steel stranded wire clamp 4-1, the second steel stranded wire clamp 4-2″ and the third steel stranded wire clamp 3-2 can adopt special clamps for fixing the steel stranded wires in the prior art, and the lifting beam 4-2 can be designed according to actual needs.
In the process of pulling out the prefabricated concrete support wall 1, as the upper ends of the first steel stranded wire 2, the second steel stranded wire 2′ and the steel boom 2″ can swing back and forth, in order to prevent the first steel stranded wire 2, the second steel stranded wire 2′ and the steel boom 2″ from causing partial damage to the prefabricated concrete support wall 1 by repeated scratch and collision with the concrete, the hollow tube 1-1 pre-buried in the upper part of the prefabricated concrete support wall 1 is a steel tube preferably, and the hollow tube 1-1 pre-buried in another position of the prefabricated concrete support wall 1 can be a plastic tube made of PVC and the like. In addition, a lubricating agent can also be smeared on the surface of the steel stranded wire 2 to reduce the friction between one of the first steel stranded wire 2, the second steel stranded wire 2′ and the steel boom 2″ and the hollow tube 1-1.
The above embodiments are preferred embodiments of the present invention. It should be noted that, those skilled in the art can also make a number of improvements and modifications without departing from the principles of the present invention, and the improvements and modifications should also be regarded as being within the protection scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201810113427.0 | Feb 2018 | CN | national |
| 201820192975.2 | Feb 2018 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/092744 | 6/26/2018 | WO | 00 |
