Foundation pit supporting structure

Abstract

The utility model relates to a foundation pit supporting structure, and relates to the technical field of engineering construction, the foundation pit supporting structure comprises a supporting ring wall arranged in a foundation pit and an annular positioning piece used for positioning the supporting ring wall, and the supporting ring wall comprises a plurality of supporting clamping rings which are sequentially clamped and matched in the vertical direction; a limiting part is arranged at the bottom end of the supporting clamping ring, a limiting groove is formed in the limiting part, a limiting block is arranged at the top end of the supporting clamping ring, and the limiting block can be inserted into the limiting groove. The supporting clamping ring is clamped and matched, dismounting and mounting are convenient, and the effect that the foundation pit supporting structure can be reused is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of engineering construction, and in particular to a foundation pit support structure. Background Art

[0002] During the construction of underground pipelines, a large number of foundation pits and shafts need to be built. Construction workers enter the underground pipelines through these foundation pits and shafts to carry out construction work. After the construction is completed, the foundation pits and shafts need to be backfilled.

[0003] When constructing a foundation pit, it is necessary to set up a supporting structure on the inner wall of the foundation pit to reinforce the inner wall of the foundation pit. The supporting structure is mostly circular and has many different types, such as steel sheet piles, concrete piles, caissons, etc.

[0004] When backfilling the foundation pit, these supporting structures need to be dismantled. When dismantling the supporting structures, many materials are not easy to reuse, especially the concrete supporting structure, which is not easy to completely dismantle after construction. In order to solve the above problems, it is necessary to develop a detachable and reusable foundation pit supporting structure. Summary of the invention

[0005] The purpose of this application is to provide a foundation pit support structure that is easy to disassemble and assemble.

[0006] The foundation pit support structure provided in this application adopts the following technical solution:

[0007] A foundation pit support structure comprises a support ring wall placed in a foundation pit and an annular positioning member for positioning the support ring wall, wherein the support ring wall comprises a plurality of support clamps which are sequentially clamped and matched in a vertical direction;

[0008] A limiting portion is arranged at the bottom end of the supporting clamp ring, a limiting groove is arranged on the limiting portion, and a limiting block is arranged at the top end of the supporting clamp ring, and the limiting block can be inserted into the limiting groove.

[0009] By adopting the above technical scheme, when the foundation pit is excavated, as the depth of the foundation pit gradually increases, the number of supporting clamps is gradually increased, the limiting part on one supporting clamp is aligned with the limiting block on the other supporting clamp, the limiting block is inserted into the limiting groove, the two supporting clamps are connected to form a supporting ring wall, and when the foundation pit is excavated to the calibrated depth, the limiting block is withdrawn from the limiting groove, and then the supporting clamps are removed one by one, which is convenient for disassembly and assembly, and is conducive to the reuse of the foundation pit support structure.

[0010] Optionally, the limiting portion and the limiting block are staggered along the annular trajectory of the supporting clamp.

[0011] By adopting the above technical solution, the limit parts and limit blocks are staggered so that when adjacent supporting clamps are snapped together, the force points between the two limit clamps are staggered, making the connection more secure.

[0012] Optionally, a hoisting hole for hoisting is provided on the limit block.

[0013] By adopting the above technical solution, the setting of the lifting hole provides a lifting point for assembling the support clamp. When transporting the support clamp, the lifting rope is installed on the support clamp, and then the support clamp is erected on the support clamp located at the top of the foundation pit and the equipment is operated to pull the lifting rope to rotate the support clamp to complete the clamping.

[0014] Optionally, a support beam is detachably connected inside the support clamp.

[0015] By adopting the above technical solution, the setting of the support beam improves the ability of the support clamp to resist impact, and when the support clamp descends with the deepening of the foundation pit excavation, it can prevent the support clamp from being deformed.

[0016] Optionally, a ladder is provided between adjacent supporting clamps, and both ends of the ladder are detachably connected to the support beams in the corresponding supporting clamps.

[0017] By adopting the above technical solution and setting up a ladder, it is convenient for relevant personnel to enter and exit the foundation pit during and after the foundation pit is excavated.

[0018] Optionally, the annular positioning member includes a plurality of bored cast-in-place piles arranged around the retaining ring wall, and the bored cast-in-place piles abut against the peripheral side wall of the retaining clamp ring.

[0019] By adopting the above technical solution, a plurality of bored piles are driven into the support clamp ring to position the support clamp ring so as to prevent the possibility of the support ring wall being offset during the descent process.

[0020] Optionally, high-pressure rotary jet columns are provided between adjacent bored piles, and the peripheral side walls of the high-pressure rotary jet columns abut against the peripheral side walls of the corresponding two bored piles.

[0021] By adopting the above technical solution, bored piles are coordinated with high-pressure rotary jet columns to fill the gaps on the outer peripheral side of the annular positioning parts to prevent possible groundwater from breaking through the annular positioning parts, thereby ensuring that the supporting ring wall can stably support the foundation pit.

[0022] Optionally, a waterproof protective layer is provided between the annular positioning member and the supporting ring wall.

[0023] By adopting the above technical solution, the waterproof protective layer can further prevent groundwater from infiltrating into the supporting ring wall, and the waterproof protective layer indirectly connects the supporting ring wall and the annular positioning piece, thereby reducing the intensity of collision between the supporting ring wall and the annular positioning piece during the descent process, thereby protecting the supporting ring wall.

[0024] Optionally, one end of the waterproof protective layer is connected to the supporting clamp located at the bottom, and a guide wheel for guiding the movement of the waterproof protective layer is provided on the annular positioning member, and the waterproof protective layer is mounted on the guide wheel.

[0025] By adopting the above technical solution, the guide wheel can guide the waterproof protective layer. When the supporting clamp located on the opposite section descends, the waterproof protective layer will also be pulled and descend synchronously with the supporting clamp. The guide wheel prevents the waterproof protective layer from directly contacting the annular positioning piece when being pulled, and causing scratches when being pulled, so as to ensure the protective effect of the waterproof protective layer.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When excavating the foundation pit, as the depth of the foundation pit gradually increases, gradually increase the number of supporting clamps, align the limiting part on one supporting clamp with the limiting block on the other supporting clamp, insert the limiting block into the limiting groove, complete the plug-in connection between the two supporting clamps, and form a supporting ring wall. When the foundation pit is excavated to the calibrated depth, the limiting block is withdrawn from the limiting groove, and then the supporting clamps are removed one by one. Disassembly and assembly are convenient, which is conducive to the reuse of the foundation pit support structure.

[0028] 2. The offset limit parts and limit blocks make it possible for the force points between the two limit clamps to be staggered when the adjacent support clamps are clamped together, making the connection more secure. The setting of the lifting holes provides lifting points for assembling the support clamps. When transporting the support clamps, the lifting rope is installed on the support clamps, and then the support clamps are erected on the support clamps at the top of the foundation pit and the equipment is operated to pull the lifting rope to rotate the support clamps to complete the clamping.

[0029] 3. Bored piles are used in conjunction with high-pressure rotary jet columns to fill the gaps on the outer periphery of the annular positioning pieces to prevent possible groundwater from breaking through the annular positioning pieces, thereby ensuring that the retaining ring wall can stably support the foundation pit, and the waterproof protective layer can further prevent groundwater from infiltrating into the retaining ring wall. The waterproof protective layer indirectly connects the retaining ring wall with the annular positioning pieces, thereby reducing the severity of the collision between the retaining ring wall and the annular positioning pieces during the descent process, thereby protecting the retaining ring wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1is a top view of a foundation pit support structure in the present application;

[0031] Figure 2 It is a top view of the foundation pit support structure in this application after removing the guide wheel and the waterproof protective layer;

[0032] Figure 3 It is a schematic cross-sectional structure diagram of a foundation pit support structure in the present application;

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the supporting ring wall in this application;

[0034] Figure 5 It is a schematic diagram of the explosion structure of the supporting ring wall in this application.

[0035] In the figure, 1. foundation pit; 2. supporting ring wall; 21. supporting clamp; 22. limiting part; 221. limiting groove; 23. limiting block; 231. lifting hole; 3. annular positioning piece; 31. bored pile; 5. supporting beam; 6. ladder; 7. high-pressure rotary jet column; 8. waterproof protective layer; 9. guide wheel. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0037] A foundation pit 1 support structure, referring to Figure 1 and Figure 2 , including a retaining ring wall 2 placed in a foundation pit 1 and an annular positioning member 3 for positioning the retaining ring wall 2. The annular positioning member 3 includes a plurality of bored cast-in-place piles 31 arranged around the retaining ring wall 2. The bored cast-in-place piles 31 abut against the peripheral side wall of the retaining ring wall 2 for positioning the retaining ring wall 2.

[0038] When constructing the foundation pit 1 , the size and position of the foundation pit 1 are first determined, and then bored piles 31 are driven along the loop of the foundation pit 1 , the foundation pit 1 is excavated, and the supporting ring wall 2 is installed into the foundation pit 1 .

[0039] Reference Figure 2 and Figure 3 The supporting ring wall 2 includes a plurality of supporting clamps 21. In the present embodiment, the supporting clamps 21 are formed by casting concrete. In other embodiments, the supporting clamps 21 may also be made of metal materials to further enhance the overall strength of the supporting clamps 21.

[0040] Furthermore, a plurality of supporting clamps 21 are snap-fitted in sequence along the vertical direction. Specifically, a limiting portion 22 is provided at the bottom end of the supporting clamp 21 , a limiting groove 221 is provided on the limiting portion 22 , and a limiting block 23 is provided at the top end of the supporting clamp 21 , and the limiting block 23 can be inserted into the limiting groove 221 .

[0041] Combination Figure 4 and Figure 5 In this embodiment, the limit block 23 is detachably connected to the support clamp 21 by bolts. In other embodiments, the limit block 23 can also be integrally formed with the support clamp 21 to enhance the stability of the connection between adjacent support clamps 21. The cross-section of the limit block 23 is T-shaped. When the limit block 23 is inserted into the limit groove 221, the adjacent support clamps 21 are clamped together to ensure that the adjacent support clamps 21 move synchronously in the vertical direction.

[0042] When installing the supporting clamp 21, as the foundation pit 1 is excavated deeper, with the help of its own gravity, the supporting clamp 21 will cut the soil on the inner side of the foundation pit 1 in the vertical downward direction and descend. Correspondingly, the inner circle of the supporting clamp 21 located at the bottom is set in a cone shape to form a knife foot.

[0043] In addition, it should be noted that the limiting portion 22 is not provided on the support clamp ring 21 located at the bottom, so as to facilitate the cutting of the soil by the blade foot and ensure the smooth descending movement of the support clamp ring 21.

[0044] Further, refer to Figure 2 and Figure 3 A high-pressure rotary spray column 7 is provided between adjacent bored piles 31 , and the peripheral side walls of the high-pressure rotary spray column 7 abut against the peripheral side walls of the corresponding two bored piles 31 .

[0045] By cooperating with the bored piles 31 and the high-pressure rotary jet column 7, possible gaps on the outer peripheral side of the annular positioning member 3 are filled to prevent possible groundwater from breaking through the annular positioning member 3, thereby ensuring that the supporting ring wall 2 can stably support the foundation pit 1.

[0046] In addition, in order to further prevent groundwater from infiltrating the supporting ring wall 2, a waterproof protective layer 8 is arranged between the annular positioning piece 3 and the supporting ring wall 2. The waterproof protective layer 8 is arranged in a strip shape and is provided in multiple groups. Multiple groups of waterproof protective layers 8 are arranged around the supporting clamp 21, and the ends of adjacent waterproof protective layers 8 are overlapped in sequence.

[0047] In this embodiment, the waterproof protective layer 8 is made of nylon cloth, and one end of the waterproof protective layer 8 is connected to the supporting clamp 21 located at the bottom, and is pulled as the supporting clamp 21 descends. Furthermore, in order to guide the movement of the waterproof protective layer 8, a guide wheel 9 for guiding the movement of the waterproof protective layer 8 is provided on the annular positioning member 3, and the waterproof protective layer 8 is placed on the guide wheel 9.

[0048] Reference Figure 4 and Figure 5In order to strengthen the connection between adjacent supporting clamps 21, in the present embodiment, the limiting portion 22 and the limiting block 23 are staggered along the annular trajectory of the supporting clamp 21, and the multiple limiting blocks 23 located on the same supporting clamp 21 are spaced apart along the circumferential direction. When the adjacent supporting clamps 21 are engaged, the limiting portion 22 can first be arranged in the gap between the two limiting blocks 23, and then the supporting clamp 21 at the upper end is rotated to insert the limiting block 23 into the limiting groove 221.

[0049] Furthermore, combined with Figure 3 A plurality of lifting holes 231 for lifting are provided on the limit block 23 to provide lifting points for the assembly of the support clamp 21. In the present embodiment, 10 lifting holes 231 are provided on each limit block 23, and the 10 lifting holes 231 are evenly divided into two groups, wherein one group of lifting holes 231 is distributed on one side of the limit block 23 close to the center of the support clamp 21, and the other group of lifting holes 231 is distributed on one side of the limit block 23 away from the center of the support clamp 21, and the lifting holes 231 are arranged in sequence along the circumferential direction of the support clamp 21.

[0050] When transporting the support clamp 21, install the lifting rope on the support clamp 21, and then erect the support clamp 21 on the support clamp 21 which is located at the top in the foundation pit 1 at this time, and operate the equipment to pull the lifting rope to rotate the support clamp 21 to complete the clamping.

[0051] Reference Figure 3 and Figure 5 In order to strengthen the strength of the support clamp 21, a support beam 5 is provided in the support clamp 21. There are four support beams 5. The four support beams 5 are connected end to end in sequence and fixed in the support clamp 21 by bolts. Furthermore, a retractable ladder 6 is provided between adjacent support clamps 21. The number of the ladders 6 is 4, which are arranged one by one corresponding to the four support beams 5.

[0052] When installing the ladder 6, one end of the ladder 6 is plugged into the support beam 5 in one support clamp 21, and the other end of the ladder 6 is plugged into the support beam 5 in another support clamp 21, and then the bolts are screwed in. The ladder 6 is installed to facilitate relevant personnel to enter and exit the foundation pit 1.

[0053] In addition, when the two support clamps 21 have a tendency to rotate relative to each other, the ladder 6 connected to the support beam 5 limits the support clamps 21, thereby preventing the adjacent support clamps 21 from rotating relative to each other and causing the support clamps 21 to release the clamping fit.

[0054] When dismantling the supporting structure, first dismantle the ladder 6, then match the lifting rope with the lifting hole 231 on the limit block 23, and pull the supporting clamp 21 to rotate the supporting clamp 21. When the limit block 23 and the limit groove 221 are disengaged, install one end of the lifting rope on the crane, lift the supporting clamp 21, and repeat the above operation until the supporting clamp 21 is completely removed from the foundation pit 1.

[0055] The implementation principle of the embodiment of the present application is: when the foundation pit 1 is excavated, as the depth of the foundation pit 1 gradually increases, the number of supporting clamps 21 is gradually increased, and the limiting portion 22 on one supporting clamp 21 is aligned with the limiting block 23 on the other supporting clamp 21, so that the limiting block 23 is inserted into the limiting groove 221, and the connection between the two supporting clamps 21 is completed to form a supporting ring wall 2. When the foundation pit 1 is excavated to the calibrated depth, the limiting block 23 is withdrawn from the limiting groove, and then the supporting clamps are removed one by one. The disassembly and assembly are convenient, which is conducive to the reuse of the foundation pit support structure.

[0056] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A foundation pit support structure, characterized in that: It comprises a retaining ring wall (2) placed in a foundation pit (1) and an annular positioning member (3) for positioning the retaining ring wall (2), wherein the retaining ring wall (2) comprises a plurality of retaining clamping rings (21) which are sequentially clamped and matched in a vertical direction; A limiting portion (22) is provided at the bottom end of the supporting clamp ring (21), a limiting groove (221) is provided on the limiting portion (22), and a limiting block (23) is provided at the top end of the supporting clamp ring (21), and the limiting block (23) can be inserted into the limiting groove (221).

2. A foundation pit support structure according to claim 1, characterized in that: The limiting portion (22) and the limiting block (23) are staggeredly arranged along the annular track of the supporting clamp ring (21).

3. A foundation pit support structure according to claim 1, characterized in that: The limiting block (23) is provided with a hoisting hole (231) for hoisting.

4. A foundation pit support structure according to claim 1, characterized in that: The support beam (5) is detachably connected inside the support clamp (21).

5. A foundation pit support structure according to claim 4, characterized in that: A ladder (6) is provided between adjacent support clamps (21), and both ends of the ladder (6) are detachably connected to the support beam (5) in the corresponding support clamp (21).

6. A foundation pit support structure according to claim 1, characterized in that: The annular positioning member (3) comprises a plurality of bored cast-in-place piles (31) arranged around the supporting ring wall (2), and the bored cast-in-place piles (31) abut against the peripheral side wall of the supporting clamp ring (21).

7. A foundation pit support structure according to claim 6, characterized in that: A high-pressure rotary spray column (7) is provided between adjacent bored cast-in-place piles (31), and the peripheral side walls of the high-pressure rotary spray column (7) abut against the peripheral side walls of the corresponding two bored cast-in-place piles (31).

8. A foundation pit support structure according to claim 6, characterized in that: A water-proof protective layer (8) is provided between the annular positioning member (3) and the supporting ring wall (2).

9. A foundation pit supporting structure according to claim 8, characterized in that: One end of the waterproof protective layer (8) is connected to the supporting clamp (21) located at the bottom, and a guide wheel (9) for guiding the movement of the waterproof protective layer (8) is provided on the annular positioning member (3), and the waterproof protective layer (8) is mounted on the guide wheel (9).

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