Foundation pit supporting structure

Abstract

The utility model relates to the technical field of foundation pit engineering, and discloses a foundation pit supporting structure which comprises a plurality of supporting piles inserted into the bottom of a foundation pit in the depth direction of the inner wall of the foundation pit and distributed at equal intervals in the length direction or the circumferential direction of the inner wall of the foundation pit, and further comprises cross beams and anchor cables. Each cross beam comprises a first supporting block and a second supporting block which are arranged in the interval direction of every two adjacent supporting piles, the two opposite ends of each first supporting block and the corresponding second supporting block are detachably connected, and the two opposite ends of each first supporting block and the corresponding second supporting block are fixed to the corresponding two adjacent supporting piles correspondingly. The anchor cable comprises two supporting rods, one ends of the two supporting rods are connected with the first supporting block and the second supporting block correspondingly, and the other ends of the two supporting rods obliquely extend downwards and are inserted into a soil body on the inner wall of the foundation pit so as to support the cross beam. The foundation pit supporting structure can solve the problem that an existing foundation pit supporting structure can not be recycled due to the fact that a concrete structure is used for transversely supporting the supporting piles.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit engineering, and particularly relates to a foundation pit support structure. Background Technique

[0002] In the field of foundation pit engineering, with the continuous growth of the demand for urban underground space development, the importance of foundation pit support technology has become increasingly prominent. In the traditional foundation pit support system, the cantilever support pile is widely used because of its simple construction and strong adaptability. During the construction of the foundation pit, the support pile is vertically inserted into the bottom of the foundation pit along the inner wall of the foundation pit, providing effective support for the inner wall of the foundation pit, effectively preventing the collapse of the foundation pit and ensuring the construction safety. In order to enhance the stability of the support pile, transverse support structures such as capping beams and waist beams are usually arranged between adjacent support piles, effectively dispersing the pressure on the inner wall of the foundation pit, enhancing the connection between the support piles, preventing the overturning and displacement of the support piles, and thus significantly improving the stability and bearing capacity of the entire support system. However, at the same time, many problems that cannot be ignored have also arisen.

[0003] The transverse support structures such as capping beams and waist beams are all made of non-recyclable concrete materials. Once the construction is completed, they become permanent construction waste, which is difficult to recycle and causes serious waste of resources. Moreover, the processes such as the pouring and curing of concrete take a long time, prolonging the overall construction period.

[0004] In view of the above problems, developing a foundation pit support structure to replace the traditional concrete structures such as capping beams and waist beams is of great significance for promoting the progress of foundation pit engineering technology and the sustainable development of the construction industry. Content of the Utility Model

[0005] (I) Technical Problems to be Solved

[0006] The utility model provides a foundation pit support structure for solving the above technical problems.

[0007] (II) Technical Solutions

[0008] To solve the above technical problems, the utility model provides the following technical solutions: A foundation pit support structure includes a number of support piles inserted into the bottom of the foundation pit along the depth direction of the inner wall of the foundation pit, and each support pile is equally spaced along the length direction or the circumferential direction of the inner wall of the foundation pit. The foundation pit support structure further includes:

[0009] A cross beam, including a first support block and a second support block arranged along the interval direction between two adjacent support piles. The opposite ends of the first support block and the second support block are detachably connected, and the opposite ends are respectively fixed on two adjacent support piles;

[0010] The anchor cable includes two support rods. One end of each of the two support rods is connected to the first support block and the second support block respectively, and the other ends both extend obliquely downward and are inserted into the soil body on the inner wall of the foundation pit to support the cross beam.

[0011] Furthermore, on the opposite ends of the aforementioned first support block and second support block, there are respectively a groove and a convex part, and they are spliced through the groove and the convex part.

[0012] Furthermore, the aforementioned cross beam further includes a first cushion block and / or a second cushion block. The first cushion block and / or the second cushion block is inserted between the first support block and the second support block, and the first cushion block is arranged at the bottom of the groove, and the second cushion block is arranged at the end face of the notch of the groove, so that the opposite ends of the first support block and the second support block respectively abut against and are fixed on two adjacent support piles.

[0013] Furthermore, there are two of the aforementioned second cushion blocks, which are respectively arranged on the two side notch end faces of the groove. The cross beam further includes a limiting block. The two ends of the limiting block are integrally connected to the two second cushion blocks respectively and are located above the convex part.

[0014] Furthermore, a first through hole is provided on the aforementioned first support block, and a second through hole is provided on the second support block. The first through hole and the second through hole are respectively used for the two support rods of the same anchor cable to pass through;

[0015] In the soil body on the inner wall of the foundation pit, there are a first insertion hole and a second insertion hole that are cross-connected. The first insertion hole is coaxially arranged with the first through hole, and the second insertion hole is coaxially arranged with the second through hole. The first insertion hole and the second insertion hole are respectively used for one end of the two support rods of an anchor cable to be inserted, and the two support rods cross and contact each other in the soil body on the inner wall of the foundation pit.

[0016] Furthermore, a fixing layer is provided between the support rod and the inner walls of the first insertion hole and the second insertion hole. The fixing layer is used to fix the support rod in the soil body on the inner wall of the foundation pit and fix the cross section of the two support rods.

[0017] Furthermore, the aforementioned fixing layer is formed by the solidification of the slurry injected into the first insertion hole and the second insertion hole;

[0018] The anchor cable further includes a limiting plate, which is arranged on the support rod and is located between the cross section of the two support rods and the cross beam. There is a grouting port on the limiting plate, and the limiting plate is used to concentrate the slurry at the cross section of the two support rods.

[0019] Furthermore, the aforementioned anchor cable further includes an anchor plate, which is fixedly connected to one end of the support rod outside the inner wall of the foundation pit.

[0020] Furthermore, the opposite ends of the aforementioned first support block and second support block are both provided with arc-shaped support surfaces, and the support surfaces are used to contact the outer peripheral wall surface of the support pile.

[0021] (3) Beneficial effects

[0022] Compared with the prior art, a foundation pit support structure provided by the utility model has the following beneficial effects:

[0023] When installing the foundation pit support structure provided by the utility model, first, determine the horizontal installation spacing between two adjacent support piles, and then insert a plurality of support piles into the foundation pit at equal intervals according to the preset spacing; then, detachably connect the opposite ends of the first support block and the second support block to form a cross beam, and at the same time fix the opposite ends of the first support block and the second support block to two adjacent support piles respectively; finally, insert one end of two support rods obliquely downward into the soil body on the inner wall of the foundation pit, and connect the other ends of the two support rods to the first support block and the second support block respectively to support the cross beam; when backfilling the foundation pit, cut off the support rods along the inner wall of the foundation pit, and then disassemble the first support block and the second support block, and the cross beam can be removed from between two adjacent support piles, realizing the removal of the foundation pit support structure. It can be seen that the foundation pit support structure replaces the concrete horizontal support structures such as the capping beam and the waist beam, and is horizontally supported between two adjacent support piles, saving the processes of concrete pouring, curing, etc., thus shortening the construction period. After the construction of the cross beam is completed, it can be disassembled and recycled, greatly reducing resource waste, reducing the construction cost, and the cross beam can be provided with oblique support through the anchor cable, effectively improving the stability and safety of the foundation pit support structure. Description of the drawings

[0024] Figure 1 It is a schematic diagram of the foundation pit support structure axially cut along the support rod in the embodiment;

[0025] Figure 2 is Figure 1 the enlarged schematic diagram at A in

[0026] Figure 3 It is a connection schematic diagram of the support pile, the first support block, the second support block and the anchor cable in the embodiment;

[0027] Figure 4 It is a connection schematic diagram of the support pile, the first support block, the second support block, the first cushion block and the second cushion block in the embodiment;

[0028] Figure 5 It is a cross-sectional view of the support pile, the first support block, the second support block, the first cushion block and the second cushion block in the embodiment.

[0029] Reference numerals in the drawings:

[0030] 1, support pile;

[0031] 2. Crossbeam; 21. First support block; 211. First through hole; 22. Second support block; 221. Second through hole; 23. First cushion block; 24. Second cushion block; 25. Limit block; 26. Support surface;

[0032] 3. Anchor cable; 31. Support rod; 32. Limit plate; 321. Grouting port; 33. Anchor plate;

[0033] 4. Foundation pit; 41. First jack;

[0034] 5. Groove; 6. Convex part; 7. Fixed layer. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] The present utility model provides a foundation pit support structure, which is used to solve the problem that the existing foundation pit support structure uses a concrete structure for lateral support of support piles and cannot be recycled.

[0037] Refer to Figure 1 、 Figure 2 and Figure 3 as shown in, Figure 1 is a schematic cross-sectional view of the foundation pit support structure along the axial direction of the support rod in the embodiment, Figure 2 is Figure 1 the enlarged schematic view at A in, Figure 3 is the connection schematic view of the support pile, the first support block, the second support block and the anchor cable in the embodiment. This foundation pit support structure includes a support pile 1, a crossbeam 2 and an anchor cable 3.

[0038] The number of support piles 1 is several. Several support piles 1 are inserted into the bottom of the foundation pit 4 along the depth direction of the inner wall of the foundation pit 4, and several support piles 1 are equally spaced along the length direction or the circumferential direction of the inner wall of the foundation pit 4.

[0039] The crossbeam 2 includes a first support block 21 and a second support block 22. The first support block 21 and the second support block 22 are arranged along the interval direction between two adjacent support piles 1, and the opposite ends of the first support block 21 and the second support block 22 are detachably connected, and the opposite ends of the first support block 21 and the second support block 22 are respectively fixed on two adjacent support piles 1.

[0040] The anchor cable 3 includes two support rods 31. One ends of the two support rods 31 are respectively connected to the first support block 21 and the second support block 22, and the other ends both extend obliquely downward and are inserted into the soil body on the inner wall of the foundation pit 4 to support the cross beam 2. In this way, the support rod 31 can provide an oblique support for the cross beam 2, effectively preventing the cross beam 2 from displacing or deforming due to external loads, and further ensuring the stability and safety of the entire foundation pit support structure.

[0041] When installing the foundation pit support structure of the above technical solution, first, determine the horizontal installation spacing between two adjacent support piles 1, and then insert a number of support piles 1 at equal intervals in the foundation pit 4 according to the preset spacing; then, detachably connect the opposite ends of the first support block 21 and the second support block 22 to form the cross beam 2, and at the same time fix the opposite ends of the first support block 21 and the second support block 22 to two adjacent support piles 1 respectively; finally, insert one ends of the two support rods 31 obliquely downward into the soil body on the inner wall of the foundation pit 4, and connect the other ends of the two support rods 31 to the first support block 21 and the second support block 22 respectively to support the cross beam 2. When backfilling the foundation pit 4, cut off the support rods 31 along the inner wall of the foundation pit 4, and then disassemble the first support block 21 and the second support block 22, and the cross beam 2 can be removed from between two adjacent support piles 1 to realize the demolition of the foundation pit support structure. It can be seen that the foundation pit support structure replaces the concrete horizontal support structures such as the capping beam and the waist beam with the cross beam 2, and the horizontal support is between two adjacent support piles 1, saving the processes such as concrete pouring and curing, thus shortening the construction period, and the cross beam 2 can be disassembled for recycling after construction is completed, greatly reducing resource waste and lowering the construction cost.

[0042] The opposite ends of the first support block 21 and the second support block 22 can be detachably connected by means such as mortise and tenon structure, bolt connection, snap connection or magnetic attraction connection, and the opposite ends of the first support block 21 and the second support block 22 can be fixed to the support pile 1 by means such as hoop or tight connection. One end of the support rod 31 can be connected to the first support block 21 or the second support block 22 by means such as screwing or clamping, and the other ends of the two support rods 31 can be fixedly connected by grouting or static friction with the soil body.

[0043] Refer to Figure 1As shown in the figure, a crossbeam 2 can be arranged between two adjacent retaining piles 1, or more than one crossbeam 2 with different heights can be arranged, and more than one cable anchor 3 can also be arranged accordingly. The crossbeams 2 and cable anchors 3 with different heights can be constructed layer by layer from top to bottom. Specifically, during construction, the foundation pit 4 can be first excavated to the installation positions of the first-layer crossbeam 2 and cable anchor 3; then, a groove is dug in the soil at the bottom of the pit between two adjacent retaining piles 1, and then the crossbeam 2 is assembled and placed into the groove. Next, the above steps are repeated to install the cable anchor 3; after the cable anchor 3 is installed, the earthwork excavation continues, and the foundation pit 4 is excavated to the installation positions of the second-layer crossbeam 2 and cable anchor 3, and then the second-layer crossbeam 2 and cable anchor 3 are installed. By repeating this process continuously, several crossbeams 2 and cable anchors 3 with different heights can be arranged between two adjacent retaining piles 1. The more the number of crossbeams 2 and cable anchors 3 arranged between two adjacent retaining piles 1, the better the supporting effect on the two adjacent retaining piles 1, and the more stable the foundation pit support structure.

[0044] Refer to Figure 2 As shown in the figure, in an embodiment of the crossbeam 2, the opposite ends of the first support block 21 and the second support block 22 respectively have a groove 5 and a protrusion 6, and are spliced through the groove 5 and the protrusion 6. In this way, by moving the first support block 21 and the second support block 22 into the space between two adjacent retaining piles 1 and then moving the first support block 21 and the second support block 22 towards each other vertically, the protrusion 6 can be inserted into the groove 5 to form the crossbeam 2, and the opposite ends of the first support block 21 and the second support block 22 can be respectively abutted and fixed on the two adjacent retaining piles 1 to complete the installation of the crossbeam 2 and the retaining pile 1; conversely, by moving the first support block 21 and the second support block 22 away from each other vertically, the protrusion 6 can be removed from the groove 5, and then the first support block 21 and the second support block 22 can be removed from the space between the two adjacent retaining piles 1 to complete the disassembly of the crossbeam 2. It can be seen that the crossbeam 2 of the foundation pit support structure can be quickly spliced and formed through the mortise and tenon structure formed by the groove 5 and the protrusion 6, which is convenient for quickly installing and disassembling the crossbeam 2 on site and effectively improves the construction efficiency.

[0045] The above groove 5 can be arranged at one end of the first support block 21 or the second support block 22, and the protrusion 6 can be arranged at one end of the second support block 22 or the first support block 21, so as to achieve splicing.

[0046] Refer to Figure 4 and Figure 5 As shown in the figure, Figure 4 is a schematic connection diagram of the retaining pile, the first support block, the second support block, the first cushion block and the second cushion block in the embodiment. Figure 5It is a cross-sectional view of the retaining pile, the first support block, the second support block, the first cushion block and the second cushion block in the embodiment. On the basis of the above embodiment in which the first support block 21 and the second support block 22 are spliced through the groove 5 and the convex part 6, the cross beam 2 further includes a first cushion block 23 and / or a second cushion block 24. The first cushion block 23 and / or the second cushion block 24 is inserted between the first support block 21 and the second support block 22, and the first cushion block 23 is located at the bottom of the groove 5, and the second cushion block 24 is located at the end face of the notch of the groove 5, so that the opposite ends of the first support block 21 and the second support block 22 respectively abut against and are fixed on two adjacent retaining piles 1. In this way, due to possible construction errors during the installation of the retaining pile 1, the actual lateral spacing between two adjacent retaining piles 1 may be greater than the preset spacing, resulting in the inability to fix both ends of the cross beam 2 on two adjacent retaining piles 1. Inserting any one of the first cushion block 23 and the second cushion block 24 between the first support block 21 and the second support block 22 can extend the length of the cross beam 2 to compensate for the construction error of the lateral spacing between the two retaining piles 1, ensuring that both ends of the cross beam 2 can stably support two adjacent retaining piles 1; the first cushion block 23 and the second cushion block 24 can also be inserted between the first support block 21 and the second support block 22 at the same time, which can better disperse and transfer the pressure between the first support block 21 and the second support block 22, improving the structural strength and stability of the cross beam 2.

[0047] Refer to Figure 4 and Figure 5 As shown, on the basis of the above embodiment in which the cross beam 2 further includes the second cushion block 24, the number of the second cushion blocks 24 is two, which are respectively located on the end faces of the two sides of the notch of the groove 5. The cross beam 2 further includes a limiting block 25, and both ends of the limiting block 25 are integrally connected to the two second cushion blocks 24 and are located above the convex part 6. In this way, the limiting block 25 and the two second cushion blocks 24 are connected to form a U-shaped structure, which can prevent the second cushion block 24 from falling off downward between the first support block 21 and the second support block 22, effectively ensuring the structural stability of the cross beam 2.

[0048] Refer to Figure 1 and Figure 4As shown, based on any of the above embodiments, the first support block 21 has a first through hole 211, and the second support block 22 has a second through hole 221. The first through hole 211 and the second through hole 221 are respectively used for two support rods 31 of the same cable anchor 3 to penetrate. First insertion holes 41 and second insertion holes (not shown in the figure) are drilled in the soil body on the inner wall of the foundation pit 4. The first insertion holes 41 and the second insertion holes are cross-connected. The first insertion hole 41 and the first through hole 211 are coaxially distributed, and the second insertion hole and the second through hole 221 are coaxially distributed. The first insertion hole 41 and the second insertion hole are respectively used for one end of two support rods 31 of a cable anchor 3 to be inserted, and the two support rods 31 cross and contact each other in the soil body on the inner wall of the foundation pit 4. In this way, after the cross beam 2 and the retaining piles 1 are installed, the first through hole 211 and the second through hole 221 on the cross beam 2 can facilitate drilling the soil body on the inner wall of the foundation pit 4 to form cross-connected first insertion holes 41 and second insertion holes; it can also facilitate guiding the two support rods 31 to be inserted into the first insertion hole 41 and the second insertion hole respectively through the first through hole 211 and the second through hole 221, and making the two support rods 31 cross and contact each other in the soil body on the inner wall of the foundation pit 4. The two support rods 31 cross and contact each other in the soil body on the inner wall of the foundation pit 4, and can support each other, thereby improving the support effect on the cross beam 2 and further ensuring the stability and safety of the entire foundation pit support structure.

[0049] Referring to Figure 1 As shown, based on the embodiment in which the first insertion hole 41 and the second insertion hole are drilled in the soil body on the inner wall of the above foundation pit 4, fixing layers 7 are provided between the support rods 31 and the inner walls of the first insertion hole 41 and the second insertion hole. The fixing layer 7 is used to fix the support rods 31 in the soil body on the inner wall of the foundation pit 4 and fix the intersection of the two support rods 31. In this way, the fixing layer 7 can firmly fix the support rods 31 in the soil body, ensuring the stability and reliability of the cable anchor 3 in the soil body. At the same time, the fixing layer 7 can fix the intersection of the two support rods 31, thereby forming a more stable support structure, further improving the support effect on the cross beam 2, and ensuring the stability and safety of the entire foundation pit support structure.

[0050] Referring to Figure 1 and Figure 2 As shown, in one embodiment of the fixing layer 7, the fixing layer 7 is formed by curing the slurry injected into the first insertion hole 41 and the second insertion hole. The cable anchor 3 further includes a limiting plate 32. The limiting plate 32 is arranged on the support rod 31 by welding or integral connection, etc., and the limiting plate 32 is located between the intersection of the two support rods 31 and the cross beam 2. The limiting plate 32 has a grouting port 321. The limiting plate 32 is used to concentrate the slurry at the intersection of the two support rods 31. In this way, the slurry can be injected from the grouting port 321 at the intersection of the two support rods 31. During the grouting process, the limiting plate 32 can compress the slurry and control the grouting volume to ensure the effective injection and curing of the slurry, thereby forming a stable fixing layer 7.

[0051] The above slurry can use concrete slurry. After the slurry solidifies, it can form concrete to firmly fix the two support rods 31 in the soil mass and fix the intersection of the two support rods 31.

[0052] Refer to Figure 1 and Figure 2 As shown, on the basis of the embodiment in which the two support rods 31 of the above anchor cable 3 respectively penetrate through the first through hole 211 and the second through hole 221, the anchor cable 3 further includes an anchor plate 33. The anchor plate 33 is fixedly connected to one end of the support rod 31 located outside the inner wall of the foundation pit 4 by means of welding or screwing. In this way, the anchor plate 33 can effectively prevent the support rod 31 from completely passing through the cross beam 2 and inserting into the soil mass on the inner wall of the foundation pit 4 and separating from the cross beam 2, so as to ensure that the anchor cable 3 can continuously and stably provide support for the cross beam 2.

[0053] Refer to Figure 3 , Figure 4 and Figure 5 As shown, on the basis of any of the above embodiments, the opposite ends of the first support block 21 and the second support block 22 both have arc-shaped support surfaces 26 for contacting the outer peripheral wall surface of the retaining pile 1. In this way, the cross beam 2 is supported on two adjacent retaining piles 1 through the support surfaces 26. The arc-shaped support surfaces 26 can effectively increase the contact area between the cross beam 2 and the retaining pile 1 to ensure that the cross beam 2 can stably contact and support the retaining pile 1.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foundation pit support structure includes a number of support piles inserted into the bottom of the foundation pit along the depth direction of the inner wall of the foundation pit, and the support piles are equally spaced along the length direction or circumferential direction of the inner wall of the foundation pit. It is characterized in that, The foundation pit support structure further includes: A cross beam, including a first support block and a second support block arranged along the interval direction between two adjacent support piles. The opposite ends of the first support block and the second support block are detachably connected, and the opposite ends are respectively fixed on two adjacent support piles; A cable anchor, including two support rods. One ends of the two support rods are respectively connected to the first support block and the second support block, and the other ends both extend obliquely downward and are inserted into the soil body on the inner wall of the foundation pit to support the cross beam.

2. The retaining structure for foundation pit according to claim 1, characterized in that, The opposite ends of the first support block and the second support block are respectively provided with a groove and a convex part, and are spliced through the groove and the convex part.

3. The retaining structure for foundation pit according to claim 2, wherein, The cross beam further includes a first cushion block and / or a second cushion block. The first cushion block and / or the second cushion block are inserted between the first support block and the second support block, and the first cushion block is arranged at the bottom of the groove, and the second cushion block is arranged at the end face of the notch of the groove, so that the opposite ends of the first support block and the second support block respectively abut against and are fixed on two adjacent support piles.

4. A foundation pit support structure according to claim 3, characterized in that, There are two second cushion blocks, which are respectively arranged on the end faces of the two sides of the notch of the groove. The cross beam further includes a limiting block. The two ends of the limiting block are integrally connected to the two second cushion blocks respectively and are located above the convex part.

5. A foundation pit support structure according to any one of claims 1-4, characterized in that, A first through hole is provided on the first support block, and a second through hole is provided on the second support block. The first through hole and the second through hole are respectively used for the two support rods of the same cable anchor to penetrate through; A first insertion hole and a second insertion hole which are cross-connected are provided in the soil body on the inner wall of the foundation pit. The first insertion hole is coaxially arranged with the first through hole, and the second insertion hole is coaxially arranged with the second through hole. The first insertion hole and the second insertion hole are respectively used for one end of the two support rods of a cable anchor to be inserted, and the two support rods are in cross contact in the soil body on the inner wall of the foundation pit.

6. The retaining structure for foundation pit according to claim 5, characterized in that, A fixing layer is provided between the support rod and the inner walls of the first insertion hole and the second insertion hole. The fixing layer is used to fix the support rod in the soil body on the inner wall of the foundation pit and fix the cross intersection of the two support rods.

7. A foundation pit support structure according to claim 6, characterized in that, The fixing layer is formed by curing the slurry injected into the first insertion hole and the second insertion hole; The cable anchor further includes a limiting plate, which is arranged on the support rod and is located between the cross intersection of the two support rods and the cross beam. A grouting port is provided on the limiting plate, and the limiting plate is used to concentrate the slurry at the cross intersection of the two support rods.

8. A foundation pit support structure according to claim 5, characterized in that, The cable anchor further includes an anchor plate, which is fixedly connected to one end of the support rod outside the inner wall of the foundation pit.

9. A foundation pit support structure according to any one of claims 1 - 4, 6 - 8, characterized in that, The opposite ends of the first support block and the second support block are both provided with arc-shaped support surfaces, and the support surfaces are used to contact the outer peripheral wall surface of the support pile.

Images