Foundation pit supporting structure and construction method thereof

Abstract

The application relates to the technical field of building, and discloses a foundation pit supporting structure and a construction method thereof. The foundation pit supporting structure comprises a first supporting assembly used for supporting the side wall of a foundation pit, a first grouting cavity is arranged in the first supporting assembly; a second supporting assembly is arranged on the side of the first supporting assembly away from the side wall, a second grouting cavity is arranged in the second supporting assembly; a grouting assembly is arranged between the first supporting assembly and the second supporting assembly, the grouting assembly is provided with a grouting pipeline and a grout inlet, the first grouting cavity and the second grouting cavity are communicated, grouting material can be poured into the grout inlet, the grouting material can fill the grouting pipeline, the first grouting cavity and the second grouting cavity, and the first supporting assembly, the second supporting assembly and the grouting assembly can be connected through the solidified grouting material. The foundation pit supporting structure and the construction method thereof can reduce the deformation probability of the foundation pit supporting structure.

Description

Technical Field

[0001] This application relates to the field of building technology, and in particular to a foundation pit support structure and its construction method. Background Technology

[0002] To ensure the safety of underground structure construction and the surrounding environment of the foundation pit, foundation pit support structures are needed to support and protect the sidewalls of the foundation pit and its surrounding environment. In engineering practice, a suitable foundation pit support structure is usually selected after a comprehensive evaluation of the foundation pit's depth, soil conditions, and other working conditions. Multiple support methods can be combined in a reasonable manner to create a suitable foundation pit support structure.

[0003] When using traditional foundation pit support structures to support and protect deep foundation pits in soft soil, the foundation pit support structure will be subjected to compression due to the strong rheological properties of soft soil in the foundation pit. This increases the probability of deformation of the foundation pit support structure, which in turn can lead to deformation and damage of the entire foundation pit support structure. Summary of the Invention

[0004] This application provides a foundation pit support structure and its construction method, which can reduce the probability of deformation of the foundation pit support structure.

[0005] In a first aspect, embodiments of this application provide a foundation pit support structure for installation within a foundation pit, the foundation pit support structure comprising:

[0006] A first support assembly is used to support the sidewall of the foundation pit. The first support assembly is used to connect with the bottom wall of the foundation pit. The first support assembly is provided with a first grouting cavity.

[0007] A second support assembly is disposed on the side of the first support assembly opposite to the sidewall, the second support assembly is connected to the bottom wall, and the second support assembly is provided with a second grouting cavity; and

[0008] A grouting assembly is disposed between the first support assembly and the second support assembly. The grouting assembly is provided with a grouting pipe and a grout inlet connected to the grouting pipe. The first grouting cavity is connected to the second grouting cavity through the grouting pipe. By injecting grout into the grout inlet, the grout can fill the grouting pipe, the first grouting cavity, and the second grouting cavity, and the first support assembly, the second support assembly, and the grouting assembly are connected through the solidified grout.

[0009] In some embodiments, the first support assembly includes a plurality of parallel first piles extending along a first direction, the plurality of first piles being spaced apart along a second direction perpendicular to the first direction, a first grouting cavity being disposed on the first piles, and one end of the first piles being connected to the bottom wall; the second support assembly includes a plurality of second piles parallel to the first piles, each second pile corresponding to one of the first piles, a second grouting cavity being disposed on the second piles, and one end of the second piles being connected to the bottom wall.

[0010] In some embodiments, the first grouting cavity is located between the two ends of the first pile body along the first direction, the grouting pipeline is arranged along a third direction, the third direction is perpendicular to the first direction and perpendicular to the second direction, and the two opposite ends of the grouting pipeline along the third direction are respectively connected to the first grouting cavity and the second grouting cavity.

[0011] In some embodiments, the foundation pit support structure further includes a water-stop curtain, which is disposed between adjacent first piles.

[0012] In some embodiments, the foundation pit support structure further includes a crossbeam disposed between the first support component and the second support component, with the opposite ends of the crossbeam connected to the first support component and the second support component, respectively.

[0013] In some embodiments, the foundation pit support structure further includes a fastening assembly, which includes cables, adjusting rods, and fasteners, wherein...

[0014] The two ends of the cable are respectively connected to the grouting assembly and the adjusting rod. The end of the adjusting rod away from the cable slidably passes through the crossbeam and is detachably connected to the fastener. The fastener abuts against the crossbeam. By sliding the adjusting rod back and forth on the crossbeam, the grouting assembly can be moved closer to or away from the crossbeam.

[0015] In some embodiments, the fastening assembly further includes a slider that is slidably connected to the first support assembly or the second support assembly.

[0016] In some embodiments, the first support assembly includes a tube and fins connected to the tube, the fins being arranged parallel to the sidewall, the tube and the fins being used to jointly insert into the bottom wall.

[0017] In some embodiments, the grouting assembly includes a grouting ring and grouting pipes disposed at opposite ends of the grouting ring. The grouting pipeline includes a first pipeline disposed on the grouting ring and a second pipeline disposed on the grouting pipe. The grout inlet is disposed on the grouting ring. The second pipeline on one of the grouting pipes is connected to the first grouting cavity, and the second pipeline on the other grouting pipe is connected to the second grouting cavity.

[0018] Secondly, embodiments of this application provide a construction method for a foundation pit support structure as described in the first aspect, comprising:

[0019] The first support component and the second support component are disposed in the foundation pit, such that the first support component is connected to the bottom wall of the foundation pit, and the second support component is connected to the bottom wall;

[0020] The grouting pipeline of the grouting assembly is connected to the first grouting cavity, and the grouting pipeline is connected to the second grouting cavity;

[0021] The grouting material is injected into the grout inlet, so that the grouting material fills the grouting pipeline, the first grouting cavity and the second grouting cavity;

[0022] Wait for the grout to solidify so that the first support assembly, the second support assembly, and the grouting assembly are connected through the grout.

[0023] The foundation pit support structure provided in this application has the following advantages: Since the first support component is provided with a first grouting cavity, the second support component is provided with a second grouting cavity, and the grouting component located between the first support component and the second support component is provided with a grouting pipe and a grout inlet connected to the grouting pipe, and the first grouting cavity is connected to the second grouting cavity through the grouting pipe, after connecting the first support component and the second support component to the bottom wall of the foundation pit and using the first support component to support the side wall of the foundation pit, grouting material can be injected into the grout inlet, so that the grouting material fills the grouting pipe, the first grouting cavity and the second grouting cavity, and the first support component, the second support component and the grouting component are connected through the solidified grouting material. Thus, the first support component and the second support component can be used together to support the side wall of the foundation pit, and the connection strength between the first support component and the second support component is high, reducing the probability of deformation of the foundation pit support structure.

[0024] The construction method for the foundation pit support structure provided in this application has similar advantages over the prior art, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the foundation pit support structure in one embodiment of this application;

[0027] Figure 2 yes Figure 1 The top view of the foundation pit support structure shown;

[0028] Figure 3 yes Figure 1 A partial enlarged view of part A of the foundation pit support structure shown;

[0029] Figure 4 yes Figure 1 The left view of the foundation pit support structure shown;

[0030] Figure 5 This is a flowchart of a construction method for a foundation pit support structure in one embodiment of this application.

[0031] The markings in the diagram mean:

[0032] 100. Foundation pit support structure;

[0033] 10. First support assembly; 11. First grouting cavity; 12. First pile body; 13. Inserted pipe; 14. Fin; 15. First flange; 16. Second flange;

[0034] 20. Second support assembly; 21. Second grouting cavity; 22. Second pile; 23. Support plate;

[0035] 30. Grouting assembly; 31. Grouting pipeline; 32. Grout distribution ring; 33. Grout distribution pipe; 34. Grout inlet pipe;

[0036] 40. Still water curtain;

[0037] 50. Crossbeam;

[0038] 60. Fastening assembly; 61. Cable; 62. Adjusting rod; 53. Fastener; 64. Slider;

[0039] 200. Side wall. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] In this specification, references to "one embodiment," "some embodiments," or simply "embodiment" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. Furthermore, in one or more embodiments, specific features, structures, or characteristics may be combined in any suitable manner.

[0044] To illustrate the technical solution of this application, the following description is provided in conjunction with specific accompanying drawings and embodiments.

[0045] Please refer to Figure 1 and Figure 2 This application provides a foundation pit support structure 100 for installation in a foundation pit. The foundation pit support structure 100 includes a first support component 10, a second support component 20, and a grouting component 30.

[0046] The first support component 10 is used to support the side wall 200 of the foundation pit. The first support component 10 is used to connect with the bottom wall of the foundation pit. The first support component 10 is provided with a first grouting cavity 11.

[0047] The second support component 20 is located on the side of the first support component 10 away from the side wall 200. The second support component 20 is connected to the bottom wall and is provided with a second grouting cavity 21.

[0048] The grouting assembly 30 is located between the first support assembly 10 and the second support assembly 20. The grouting assembly 30 is provided with a grouting pipe 31 and a grout inlet connected to the grouting pipe 31. The first grouting cavity 11 is connected to the second grouting cavity 21 through the grouting pipe 31. By injecting grout into the grout inlet, the grout can fill the grouting pipe 31, the first grouting cavity 11 and the second grouting cavity 21, and the first support assembly 10, the second support assembly 20 and the grouting assembly 30 are connected by the solidified grout.

[0049] It is understandable that the grouting material can be concrete grout, etc. After the grouting material solidifies, the first support component 10, the second support component 20 and the grouting component 30 become a whole, which are used to jointly support the side wall 200 of the foundation pit. The stability is better, and the connection strength of the first support component 10 and the second support component 20 is high, which can reduce the probability of deformation of the foundation pit support structure 100.

[0050] The foundation pit support structure 100 provided in this application embodiment has a first grouting cavity 11 in the first support component 10, a second grouting cavity 21 in the second support component 20, and a grouting component 30 located between the first support component 10 and the second support component 20, which has a grouting pipe 31 and a grout inlet connected to the grouting pipe 31. The first grouting cavity 11 is connected to the second grouting cavity 21 through the grouting pipe 31. Therefore, when both the first support component 10 and the second support component 20 are connected to the bottom wall of the foundation pit, and the first support component 10 is used... After the sidewall 200 of the foundation pit is supported, grouting material can be injected into the grout inlet to fill the grouting pipe 31, the first grouting cavity 11 and the second grouting cavity 21. The first support component 10, the second support component 20 and the grouting component 30 are connected by the solidified grouting material. Thus, the first support component 10 and the second support component 20 can be used together to support the sidewall 200 of the foundation pit. The connection strength of the first support component 10 and the second support component 20 is high, which reduces the probability of deformation of the foundation pit support structure 100.

[0051] Please refer to this as well. Figure 5 The construction method of the foundation pit support structure 100 provided in this application embodiment includes the following steps:

[0052] S100: The first support component 10 and the second support component 20 are placed in the foundation pit, such that the first support component 10 is connected to the bottom wall of the foundation pit, and the second support component 20 is connected to the bottom wall.

[0053] S200: Connect the grouting pipe 31 of the grouting assembly 30 to the first grouting cavity 11, and connect the grouting pipe 31 to the second grouting cavity 21.

[0054] S300: Grouting material is injected into the grout inlet, so that the grouting material fills the grouting pipe 31, the first grouting cavity 11 and the second grouting cavity 21.

[0055] S400: Wait for the grout to solidify so that the first support component 10, the second support component 20 and the grouting component 30 are connected by the grout.

[0056] It is understood that the bottom end of the first support component 10 can be inserted into the bottom wall of the pit, and the bottom end of the second support component 20 can be inserted into the bottom wall of the pit or the second support component 20 can be abutted against the bottom wall of the pit.

[0057] In this embodiment, the first support component 10 includes a plurality of parallel first pile bodies 12, the first pile bodies 12 extending along a first direction, the plurality of first pile bodies 12 being spaced apart along a second direction, the second direction being perpendicular to the first direction, a first grouting cavity 11 being disposed on the first pile body 12, and one end of the first pile body 12 being used to connect to the bottom wall.

[0058] The second support component 20 includes a plurality of second pile bodies 22, which are arranged in parallel with the first pile body 12. Each second pile body 22 corresponds to one first pile body 12, that is, the plurality of second pile bodies 22 are arranged in a one-to-one correspondence with the plurality of first pile bodies 12. The second grouting cavity 21 is located on the second pile body 22, and one end of the second pile body 22 is connected to the bottom wall.

[0059] By adopting the above scheme, the structure of the first support component 10 and the structure of the second support component 20 are relatively simple, and the first support component 10 can support the side wall 200 of the foundation pit at multiple positions in the second direction.

[0060] Understandably, multiple first piles 12 can be set along the perimeter of the foundation pit, and soft soil is filled between the first piles 12 and the second piles 22 to further fix the first piles 12 and the second piles 22.

[0061] Optionally, the first grouting cavity 11 is located between the two ends of the first pile body 12 along the first direction, and the grouting pipeline 31 is arranged along a third direction, which is perpendicular to both the first and second directions. The two opposite ends of the grouting pipeline 31 along the third direction are respectively connected to the first grouting cavity 11 and the second grouting cavity 21. This arrangement facilitates the connection of the first support assembly 10, the second support assembly 20, and the grouting assembly 30 through the solidified grout.

[0062] The first pile body 12 is provided with a first opening (not shown in the figure) that communicates with the first grouting cavity 11, and the grouting pipe 31 is connected to the first grouting cavity 11 through the first opening. This arrangement allows the solidified grouting pipe 31 and the grouting material in the first grouting cavity 11 to form a T-shaped structure, thereby strengthening the traction and support of the first pile body 12 and the second pile body 22.

[0063] The second pile body 22 is provided with a second opening (not shown in the figure) that communicates with the second grouting cavity 21. The grouting pipe 31 is connected to the second grouting cavity 21 through the second opening. This arrangement allows the grouting material in the solidified grouting pipe 31 and the second grouting cavity 21 to form a T-shaped structure, thereby further strengthening the traction and support of the first pile body 12 and the second pile body 22.

[0064] Optionally, please refer to the following as well. Figure 4 The foundation pit support structure 100 also includes a water-stop curtain 40, which is located between adjacent first piles 12. This arrangement prevents water in the sidewalls 200 of the foundation pit from flowing into the pit.

[0065] Optionally, diagonal bracing columns (not shown in the figure) and a clamping mechanism (not shown in the figure) can be provided to support the first pile 12 and the second pile 22, so as to reduce the possibility of deformation and damage to the foundation pit support structure 100 caused by deformation of the first pile 12 and the second pile 22, thereby improving the stability of the foundation pit support structure 100.

[0066] Please refer to Figure 1 and Figure 2 In some embodiments, the foundation pit support structure 100 further includes a crossbeam 50, which is disposed between the first support component 10 and the second support component 20, and the two opposite ends of the crossbeam 50 are respectively connected to the first support component 10 and the second support component 20.

[0067] By adopting the above solution, the connection strength between the first support component 10 and the second support component 20 can be improved.

[0068] It is understandable that multiple crossbeams 50 can be spaced out along the first direction.

[0069] In this embodiment, the crossbeam 50 is located between the first pile body 12 and the second pile body 22. The two opposite ends of the crossbeam 50 are connected to the first pile body 12 and the second pile body 22 respectively. Each first pile body 12 corresponds to two crossbeams 50, and the two crossbeams 50 are respectively located at the upper and lower ends of the first pile body 12.

[0070] Please refer to this as well. Figure 3Optionally, the foundation pit support structure 100 also includes a fastening assembly 60, which includes a cable 61, an adjusting rod 62, and a fastener 53. The two ends of the cable 61 are connected to the grouting assembly 30 and the adjusting rod 62, respectively. The end of the adjusting rod 62 away from the cable 61 slidably passes through the crossbeam 50 and is detachably connected to the fastener 53. The fastener 53 abuts against the crossbeam 50. By sliding the adjusting rod 62 back and forth on the crossbeam 50, the grouting assembly 30 can be moved closer to or away from the crossbeam 50.

[0071] By adopting the above scheme, not only can the position of the grouting component 30 be adjusted by the fastening component 60 to ensure precise connection between the grouting pipe 31 of the grouting component 30 and the first grouting cavity 11 and the second grouting cavity 21, but the fastening component 60 can also be used to further enhance the connection strength between the first support component 10 and the second support component 20 after the grout has solidified.

[0072] Understandably, the adjusting rod 62 slides back and forth on the crossbeam 50 in the first direction.

[0073] Alternatively, fastener 53 may be a snap-fit, pin, or nut.

[0074] In this embodiment, the fastening assembly further includes a slider 64, which is slidably connected to the first support assembly 10 or to the second support assembly 20. This configuration allows the adjusting rod 62 to slide more smoothly when it reciprocates on the crossbeam 50.

[0075] It is understandable that the sliding direction of slider 64 relative to the first support component 10 and the sliding direction of slider 64 relative to the second support component 20 are both parallel to the first direction.

[0076] Optionally, the first support component 10 is provided with a slide rail, and the slider 64 is slidably connected to the slide rail; or, the first support component 10 is provided with a slide rod, and the slider 64 is slidably sleeved on the slide rod.

[0077] In this embodiment, the slider 64 is slidably connected to the first pile body 12 or the second pile body 22.

[0078] Understandably, the fastening assembly 60 can also ensure the parallelism between the first pile 12 and the second pile 22, and also plays a certain role in preventing the first pile 12 and the second pile 22 from deforming under stress in the later stage.

[0079] Optionally, multiple fastening components 60 may be arranged around the grouting component 30 at intervals, such as four, where two fastening components 60 are connected to the first support component 10 via sliders 64, and the other two fastening components 60 are connected to the second support component 20 via sliders 64.

[0080] Please refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, the first support assembly 10 includes a tube 13 and a fin 14 connected to the tube 13. The fin 14 is arranged parallel to the sidewall 200, and the tube 13 and the fin 14 are used to insert together into the bottom wall.

[0081] By adopting the above scheme, the contact area between the first support component 10 and the bottom wall of the pit along the third direction can be increased, thereby improving the anti-tilting performance of the pit support structure 100.

[0082] Optionally, one end of the fin 14 near the bottom wall of the pit is tapered to facilitate the insertion of the tube 13 and the fin 14 into the bottom wall.

[0083] One fin 14 is provided on each of the opposite sides of the insertion tube 13, so as to further increase the contact area between the first support assembly 10 and the bottom wall of the pit along the third direction, and improve the anti-tilting performance of the pit support structure 100.

[0084] Optionally, the first support assembly 10 is provided with a first flange 15, and the insertion tube 13 is provided with a second flange 16. The second flange 16 abuts against the bottom wall of the pit, and the first flange 15 and the second flange 16 are connected by bolts. In this way, not only can the stability of the first support assembly 10 be improved, but the connection between the first support assembly 10 and the insertion tube 13 can also be facilitated.

[0085] Optionally, the second support component 20 is provided with a support plate 23, which is used to abut against the bottom wall of the pit. This arrangement can increase the contact area between the second support component 20 and the bottom wall of the pit, thereby further improving the anti-tilting performance of the pit support structure 100.

[0086] In this embodiment, the insertion tube 13 is connected to the first pile body 12, and the support plate 23 is connected to the second pile body 22.

[0087] Please refer to Figure 1 In some embodiments, the grouting assembly 30 includes a grouting ring 32 and grouting pipes 33 disposed at opposite ends of the grouting ring 32. The grouting pipeline 31 includes a first pipeline disposed on the grouting ring 32 and a second pipeline disposed on the grouting pipe 33. The grout inlet is disposed on the grouting ring 32. The second pipeline on one of the grouting pipes 33 is connected to the first grouting cavity 11, and the second pipeline on the other grouting pipe 33 is connected to the second grouting cavity 21.

[0088] By adopting the above scheme, the grouting material can be injected into the first grouting cavity 11 and the second injection cavity simultaneously using the grouting ring 32.

[0089] Optionally, the grouting assembly 30 also includes a grout inlet pipe 34, which is connected to the first pipeline through a grout inlet.

[0090] The construction method of the foundation pit support structure 100 provided in the above embodiment includes the following steps:

[0091] Step 1: Drive the insertion tube 13 into the bottom wall of the pit. During the tube driving process, ensure that the fins 14 are parallel or nearly parallel to the side wall 200 of the pit until the second flange 16 on the insertion tube 13 comes into contact with the bottom wall of the pit.

[0092] Step 2: Connect the first flange 15 of the first pile body 12 and the second flange 16 on the insertion pipe 13, erect the second pile body 22 in the foundation pit and connect the crossbeam 50;

[0093] Step 3: Suspend the grouting ring 32 to the designated position via four cables 61, then adjust each adjusting rod 62 to tighten the four cables 61, while keeping the first pile body 12 and the second pile body 22 in a stable state perpendicular to the bottom wall of the foundation pit, and then weld the grouting ring 32 to the grouting pipe 33 together.

[0094] Step 4: Fix the water-stop curtain 40 between adjacent first piles 12, and then fill the space between the first pile 12 and the second pile 22 with soft soil.

[0095] Step 5: Connect the grouting pipe 34 to the grouting pump and inject grouting material into the grouting ring 32 until the grouting material fills the first grouting cavity 11 and the second grouting cavity 21 under pressure. After the grouting material solidifies, it forms a T-shaped reinforced concrete structure, which strengthens the traction and support of the first pile 12 and the second pile 22.

[0096] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A foundation pit support structure for installation within a foundation pit, characterised in that, The foundation pit supporting structure comprises: a first supporting assembly for supporting the sidewall of the foundation pit, the first supporting assembly being configured to be connected to a bottom wall of the foundation pit, the first supporting assembly being provided with a first grouting cavity; a second supporting assembly arranged on a side of the first supporting assembly away from the sidewall, the second supporting assembly being connected to the bottom wall, the second supporting assembly being provided with a second grouting cavity; and a grouting assembly arranged between the first supporting assembly and the second supporting assembly, the grouting assembly being provided with a grouting pipeline and a grouting inlet connected to the grouting pipeline, the first grouting cavity being connected to the second grouting cavity through the grouting pipeline, and the grouting assembly being configured to be connected to the first supporting assembly and the second supporting assembly through grouting material after the grouting material is injected into the grouting inlet.

2. The excavation support structure of claim 1, wherein, The first supporting assembly comprises a plurality of first piles arranged in parallel, the first piles extending along a first direction, and the first piles being arranged in parallel along a second direction, the second direction being perpendicular to the first direction, the first grouting cavity being arranged in the first piles, and one end of the first piles being configured to be connected to the bottom wall.

3. A foundation pit support structure according to claim 2, wherein The second supporting assembly comprises a plurality of second piles arranged in parallel with the first piles, each of the second piles corresponding to one of the first piles, the second grouting cavity being arranged in the second piles, and one end of the second piles being connected to the bottom wall.

4. The excavation support structure of claim 2, wherein, The first grouting cavity is arranged between two ends of the first piles along the first direction, the grouting pipeline is arranged along a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction, and opposite ends of the grouting pipeline are connected to the first grouting cavity and the second grouting cavity, respectively.

5. The excavation support structure of claim 1, wherein, The foundation pit supporting structure further comprises a waterproof curtain arranged between adjacent first piles.

6. A foundation pit retaining structure according to claim 5, wherein The foundation pit supporting structure further comprises a cross beam arranged between the first supporting assembly and the second supporting assembly, and opposite ends of the cross beam are connected to the first supporting assembly and the second supporting assembly, respectively. The foundation pit supporting structure further comprises a fastening assembly, the fastening assembly comprising a cable, an adjusting rod, and a fastener, wherein 7. A foundation pit retaining structure according to claim 6, wherein opposite ends of the cable are connected to the grouting assembly and the adjusting rod, respectively, one end of the adjusting rod away from the cable is slidably penetrated through the cross beam and detachably connected to the fastener, the fastener abutting against the cross beam, and the grouting assembly is configured to be moved closer to or away from the cross beam by reciprocally sliding the adjusting rod on the cross beam.

8. The excavation structure according to any one of claims 1 to 7, wherein The fastening assembly further comprises a sliding block, the sliding block being slidably connected to the first supporting assembly or the second supporting assembly. The first supporting assembly comprises a cannula and a fin connected to the cannula, the fin being arranged in parallel with the sidewall, and the cannula and the fin being configured to be inserted into the bottom wall together.

9. A retaining structure according to any one of claims 1 to 7, wherein The grouting assembly comprises a grout distribution ring and grout distribution pipes arranged at opposite ends of the grout distribution ring, the grouting pipeline comprises a first pipeline arranged in the grout distribution ring and a second pipeline arranged in the grout distribution pipes, and the grout inlet is arranged in the grout distribution ring, wherein the second pipeline on one of the grout distribution pipes is in communication with the first grouting cavity, and the second pipeline on the other grout distribution pipe is in communication with the second grouting cavity.

10. A method of constructing a foundation pit support structure according to any one of claims 1 to 9, characterized by, Comprise: arranging the first support assembly and the second support assembly in the foundation pit, so that the first support assembly is connected to the bottom wall of the foundation pit, and the second support assembly is connected to the bottom wall; arranging the grouting pipeline of the grouting assembly in communication with the first grouting cavity and the second grouting cavity; pouring the grouting material into the grout inlet, so that the grouting material fills the grouting pipeline, the first grouting cavity and the second grouting cavity; waiting for the grouting material to solidify, so that the first support assembly, the second support assembly and the grouting assembly are connected by the grouting material.

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