Foundation pit supporting device capable of effectively preventing foundation pit from collapsing

Abstract

The foundation pit supporting device capable of effectively preventing the foundation pit from collapsing comprises foundation pit supporting plates, supporting plate splicing connecting pieces are fixedly connected to the left sides and the right sides of the foundation pit supporting plates, and the supporting plate splicing connecting pieces on the adjacent foundation pit supporting plates are detachably connected. Anti-bending mechanisms are fixedly arranged on the foundation pit supporting plates, the anti-bending mechanisms extend in the left-right direction, and the anti-bending mechanisms on the adjacent foundation pit supporting plates are detachably connected with each other; a connecting cross beam is fixedly connected to the front side face of the foundation pit supporting plate and extends in the left-right direction, the connecting cross beam is detachably connected with one end of an auxiliary supporting mechanism, the other end of the auxiliary supporting mechanism extends downwards and is used for being supported at the bottom of a foundation pit, and the adjacent auxiliary supporting mechanisms are detachably connected with each other. According to the foundation pit supporting device capable of effectively preventing the foundation pit from collapsing, all the auxiliary components and the supporting plate can be connected into a whole, the integrity and the pressure resistance are better, and the foundation pit can be effectively prevented from collapsing.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit support, in particular to a foundation pit support device which can effectively prevent the foundation pit from collapsing. Background Art

[0002] Foundation pit support refers to the support, reinforcement and protection measures for the side walls of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. In the field of foundation pit support technology, Larsen steel sheet piles are often used as support plates to support shallow foundation pits. The common form is to insert the embedded end of the Larsen steel sheet pile into the foundation pit, and then support the foundation pit with the Larsen steel sheet piles;

[0003] The existing foundation pit support device has the following problems. For example, when the existing splicable support plates are spliced, only the support plates are often spliced, and the various auxiliary support mechanisms are not connected as a whole, resulting in fewer connection points, thereby making its integrity and compression resistance poor. Utility Model Content

[0004] In order to solve the problem of poor integrity and compressive resistance of support plates after splicing in the background technology, the utility model proposes a foundation pit support device which can effectively prevent foundation pit collapse.

[0005] The technical solution of the utility model is: comprising a foundation pit support plate,

[0006] The left and right sides of the foundation pit support plates are fixedly connected with support plate splicing connectors, and the support plate splicing connectors on adjacent foundation pit support plates are detachably connected to each other;

[0007] An anti-bending mechanism is fixedly provided on the foundation pit supporting plate, the anti-bending mechanism extends in the left-right direction, and the anti-bending mechanisms on adjacent foundation pit supporting plates are detachably connected to each other;

[0008] A connecting crossbeam is fixedly connected to the front side of the foundation pit support plate, and the connecting crossbeam extends in the left-right direction. One end of the connecting crossbeam is detachably connected to the auxiliary support mechanism. The other end of the auxiliary support mechanism extends downward and is used to support the bottom of the foundation pit. Adjacent auxiliary support mechanisms are detachably connected to each other.

[0009] The lower end of the foundation pit supporting plate is fixedly connected with a mounting base, and the lower surface of the mounting base is fixedly connected with an embedded pile.

[0010] Preferably, the support plate splicing connector includes a fixed support frame, the fixed support frame is fixedly connected to the right side of the foundation pit support plate, and a support plug-in frame is fixedly connected to the right side of the foundation pit support plate, and the support plug-in frame is located below the fixed support frame;

[0011] A connecting bracket is fixedly connected to the left side of the foundation pit support plate, and a locking socket adapted to the locking bracket is provided on the connecting bracket, and the connecting bracket can be inserted into the gap between the fixed support frame and the supporting bracket;

[0012] A locking piece extending in the up-down direction is arranged on the fixed support frame. The length of the locking piece is adjustable and the lower end of the locking piece can extend to the bottom of the fixed support frame and be inserted into the locking socket.

[0013] Preferably, the locking member includes a connecting column, which extends in the up-down direction, the lower end of the connecting column is fixedly connected to a slide, the lower end of the slide is fixedly connected to a locking plug frame, and the locking plug frame extends in the up-down direction, the upper end of the connecting column is fixedly connected to a handle, the handle is located outside the fixed support frame, a slide groove is provided inside the fixed support frame, the slide groove extends in the up-down direction, the interior of the slide groove is connected to the socket, the lower end of the connecting column is located inside the slide groove, the outer surface of the slide is slidably connected to the interior of the slide groove, a spring is fixedly connected between the upper surface of the slide and the top wall of the slide groove, and the spring is sleeved on the connecting column.

[0014] Preferably, the anti-bending mechanism includes a telescopic frame which is telescopic at both ends, the telescopic frame is fixedly connected to the front side of the foundation pit support plate, the telescopic frame is provided with a stopper, the stopper is used to lock the telescopic frame from being telescoped in the left and right directions, the telescopic frame is provided with a telescopic frame splicing piece, the telescopic frame splicing piece is used to be detachably connected to the telescopic frame on the adjacent foundation pit support plate.

[0015] Preferably, the telescopic frame includes a main supporting beam, a right sliding bracket and a left sliding bracket, the interior of the main supporting beam is provided with a guide slot extending along the left and right directions, the left end of the guide slot is slidably provided with a left sliding bracket extending along the left and right directions, and the right end of the guide slot is slidably provided with a right sliding bracket extending along the left and right directions.

[0016] Preferably, the stopper includes a threaded locking port and a locking bolt, two bolt sockets are provided on the upper surface of the main supporting beam, and the upper surfaces of the right sliding bracket and the left sliding bracket are provided with a plurality of threaded locking ports spaced apart on the left and right sides, and the interior of the threaded locking port is provided with a threaded structure matching the locking bolt, the two bolt sockets and the interiors of the corresponding upper and lower threaded locking ports are both plugged with locking bolts, and the interiors of the threaded locking ports are both threadedly connected to the lower ends of the corresponding locking bolts.

[0017] Preferably, the telescopic frame splicing component includes a left connecting frame and a right connecting frame, the left connecting frame is fixedly connected to the left end of the left sliding frame, the right connecting frame is fixedly connected to the right end of the right sliding frame, the left connecting frame and the right connecting frame are located in left-right correspondence, a connecting slot adapted to the left connecting frame is provided inside the right connecting frame, an inner bolt hole which is transparent from top to bottom is provided on the upper surface of the left connecting frame, and a bolt insertion hole which is transparent from top to bottom is provided on the right connecting frame;

[0018] When the left connecting frame is inserted into the connecting slot of the right connecting frame, the inner bolt hole corresponds to the bolt insertion hole up and down, and a fixing bolt is inserted into both the inner bolt hole and the bolt insertion hole.

[0019] Preferably, the auxiliary support mechanism includes a mounting bracket, which is fixedly connected to the front side of the connecting beam, and the mounting bracket is detachably connected to the upper end of the connecting support rod, and the lower end of the connecting support rod is fixedly connected to a support seat, and a support seat connecting mechanism is fixedly connected to the support seat, and the support seat connecting mechanism is used to detachably splice two adjacent support seats.

[0020] Preferably, the support seat connection mechanism includes a screw rack, which is fixedly connected to the left end of the front side of the support seat, a screw is inserted inside the screw rack, a turntable is fixedly connected to the right end of the screw, and a connecting frame is fixedly connected to the right end of the front side of the support seat, and a threaded connection hole matching the screw is provided inside the connecting frame.

[0021] Preferably, a plurality of ground nails are fixedly connected to the lower surface of the support seat.

[0022] The advantages of the utility model are as follows: the various auxiliary components on the support plate can also be connected as a whole, with better integrity, and can jointly bear the pressure when subjected to force, thereby making its compression resistance better, and can effectively avoid the collapse of the foundation pit caused by the bending or tipping of the support plate when subjected to force. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the main structure of Example 1;

[0025] Figure 2 This is a schematic diagram of the partial cross-sectional structure of the support plate splicing connector of Example 1.

[0026] In the figure, 1 is a foundation pit support plate, 2 is a mounting base, 3 is an embedded pile, 4 is a ground nail, 5 is an anti-bending mechanism, 51 is a main supporting beam, 52 is a right sliding bracket, 53 is a left sliding bracket, 54 is a left connecting frame, 55 is a right connecting frame, 56 is a threaded locking port, 57 is a locking bolt, 6 is a supporting seat, 7 is a connecting beam, 8 is a mounting bracket, 9 is a supporting plate splicing connector, 91 is a fixed supporting frame, 92 is a connecting column, 93 is a sliding frame, 94 is a locking bracket, 95 is a supporting bracket, 96 is a spring, 97 is a handle, 98 is a connecting bracket, 10 is a connecting rod, 11 is a supporting seat connecting mechanism, 111 is a screw bracket, 112 is a screw, 113 is a connecting frame, and 114 is a turntable. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1: This embodiment aims to provide a foundation pit support device that can effectively prevent foundation pit collapse.

[0029] according to Figure 1 to Figure 2As shown, the left and right sides of the foundation pit supporting plate 1 are fixedly connected with supporting plate splicing connectors 9, and the supporting plate splicing connectors 9 on adjacent foundation pit supporting plates 1 are detachably connected to each other. The supporting plate splicing connectors 9 include a fixed support frame 91, and the fixed support frame 91 is fixedly connected to the right side of the foundation pit supporting plate 1. A supporting plug-in frame 95 is fixedly connected to the right side of the foundation pit supporting plate 1, and the supporting plug-in frame 95 is located below the fixed support frame 91. A connecting plug-in frame 98 is fixedly connected to the left side of the foundation pit supporting plate 1. A locking socket adapted to the locking plug-in frame 94 is provided on the connecting plug-in frame 98. The connecting plug-in frame 98 can be inserted into the gap between the fixed support frame 91 and the supporting plug-in frame 95. A locking piece extending in the up and down direction is provided on the fixed support frame 91. The length of the locking piece is adjustable and its lower end can extend to the bottom of the fixed support frame 91 and be inserted in the locking socket. The locking piece includes a connecting column 9 The locking bracket 94 is fixedly connected to the upper end of the connecting column 92, and the lower end of the connecting column 92 is fixedly connected to the sliding bracket 93. The lower end of the sliding bracket 93 is fixedly connected to the locking bracket 94, and the locking bracket 94 extends in the upper and lower directions. The upper end of the connecting column 92 is fixedly connected to the handle 97, and the handle 97 is located outside the fixed support frame 91. The interior of the fixed support frame 91 is provided with a slide groove, which extends in the upper and lower directions. The interior of the slide groove is connected to the socket. The lower end of the connecting column 92 is located inside the slide groove, and the outer surface of the slide groove is slidably connected to the interior of the slide groove. A spring 96 is fixedly connected between the upper surface of the slide 93 and the top wall of the slide groove. The spring 96 is sleeved on the connecting column 92, so that the connecting bracket 98 on the adjacent foundation pit support plate 1 can be locked in the gap between the fixed support frame 91 and the support bracket 95 through the plug-in component, so that the two adjacent foundation pit support plates 1 can be detachably connected.

[0030] An anti-bending mechanism 5 is fixedly provided on the foundation pit supporting plate 1, and the anti-bending mechanism 5 extends in the left-right direction. The anti-bending mechanisms 5 on adjacent foundation pit supporting plates 1 are detachably connected to each other, and the anti-bending mechanism 5 includes a telescopic frame that is telescopic at both ends, and the telescopic frame is fixedly connected to the front side of the foundation pit supporting plate 1. The telescopic frame includes a main supporting crossbeam 51, a right sliding bracket 52 and a left sliding bracket 53. A guide slide groove extending in the left-right direction is provided inside the main supporting crossbeam 51, and a left sliding bracket 53 extending in the left-right direction is slidably provided at the left end of the guide slide groove, and a right sliding bracket 52 extending in the left-right direction is slidably provided at the right end of the guide slide groove. A telescopic frame splicing piece is provided on the telescopic frame, and the telescopic frame splicing piece is used to be detachably connected to the telescopic frame on the adjacent foundation pit supporting plate 1. The telescopic frame splicing piece includes a left connecting frame 54 and a right connecting frame 55. 4 is fixedly connected to the left end of the left sliding bracket 53, and the right connecting frame 55 is fixedly connected to the right end of the right sliding bracket 52. The left connecting frame 54 and the right connecting frame 55 are located in the left and right positions. A connecting slot adapted to the left connecting frame 54 is provided inside the right connecting frame 55. An inner bolt hole which is transparent from top to bottom is provided on the upper surface of the left connecting frame 54, and a bolt insertion hole which is transparent from top to bottom is provided on the right connecting frame 55. When the left connecting frame 54 is inserted into the connecting slot of the right connecting frame 55, the inner bolt hole and the bolt insertion hole correspond to each other from top to bottom, and fixing bolts are inserted into the inner bolt hole and the bolt insertion hole together. The extension and retraction of the telescopic frame facilitates the connection between adjacent anti-bending mechanisms 5. When the anti-bending mechanisms 5 of the foundation pit supporting plates 1 on the four working surfaces are connected together, an integral mouth-shaped supporting structure is formed, thereby supporting the foundation pit supporting plates 1 to prevent the foundation pit supporting plates 1 from being bent under force.

[0031] A stopper is provided on the telescopic frame, which is used to lock the telescopic frame's telescopic extension in the left and right directions. The stopper includes a threaded locking opening 56 and a locking bolt 57. Two bolt sockets are provided on the upper surface of the main supporting beam 51. The upper surfaces of the right sliding bracket 52 and the left sliding bracket 53 are provided with a plurality of threaded locking openings 56 spaced apart from each other on the left and right sides, and the interior of the threaded locking opening 56 is provided with a threaded structure matching the locking bolt 57. The two bolt openings and the interiors of the corresponding threaded locking openings 56 are both plugged with locking bolts 57, and the interiors of the threaded locking openings 56 are both threadedly connected to the lower ends of the corresponding locking bolts 57, and the telescopic extension of the left and right ends of the telescopic frame is locked by the locking bolts 57.

[0032] A connecting crossbeam 7 is fixedly connected to the front side of the foundation pit supporting plate 1, and the connecting crossbeam 7 extends in the left and right direction. One end of the connecting crossbeam 7 is detachably connected to the auxiliary support mechanism, and the other end of the auxiliary support mechanism extends downward and is used to support the bottom of the foundation pit. Adjacent auxiliary support mechanisms are detachably connected to each other. The auxiliary support mechanism includes a mounting bracket 8, which is fixedly connected to the front side of the connecting crossbeam 7. The mounting bracket 8 is detachably connected to the upper end of the connecting support rod 10. The specific detachable connection method is to insert the upper end of the connecting support rod 10 into the interior of the mounting bracket 8, and then fix the connecting support rod 10 to the interior of the mounting bracket 8 by fixing bolts. The lower end of the connecting rod 10 is fixedly connected to a support seat 6, and a plurality of ground nails 4 are fixedly connected to the lower surface of the support seat 6. A support seat connecting mechanism 11 is fixedly connected to the support seat 6, and the support seat connecting mechanism 11 is used to detachably splice two adjacent support seats 6. The support seat connecting mechanism 11 includes a screw rack 111, and the screw rack 111 is fixedly connected to the left end of the front side surface of the support seat 6. A screw 112 is inserted into the screw rack 111, and a turntable 114 is fixedly connected to the right end of the screw 112. A connecting frame 113 is fixedly connected to the right end of the front side surface of the support seat 6, and a threaded connection hole matching the screw 112 is provided inside the connecting frame 113.

[0033] The lower end of the foundation pit support plate 1 is fixedly connected with a mounting base 2, and the lower surface of the mounting base 2 is fixedly connected with an embedded pile 3, and the embedded pile 3 can be column-shaped or plate-shaped.

[0034] Working principle: During the working process, the construction personnel first place the foundation pit support plate 1 at the bottom of the foundation pit, and then pull the handle 97 on one foundation pit support plate 1, so that the handle 97 drives the connecting column 92 connected thereto upward, and the connecting column 92 drives the slide 93 upward, thereby driving the locking bracket 94 upward. During the upward process of the locking bracket 94, the spring 96 between the slide 93 and the top wall of the slide groove is compressed, and then the construction personnel insert the connecting bracket 98 on another foundation pit support plate 1 into the fixed support frame 91 and the support In the gap between the plug racks 95, the locking socket on the connecting plug rack 98 corresponds to the position of the slide slot up and down, and then the construction personnel release the handle 97. Under the action of the elastic deformation of the spring 96, the slide rack 93 drives the locking plug rack 94 to slide downward and insert into the interior of the locking socket, so that the two foundation pit support plates 1 are connected as one. The construction personnel connect the foundation pit support plates 1 on all working surfaces in the foundation pit as one according to the above method, and then apply downward pressure to the foundation pit support plates 1 as a whole, so that the embedded piles 3 are inserted into the bottom of the foundation pit.

[0035] After the foundation pit support plate 1 is assembled, the construction workers pull the right sliding bracket 52 and the left sliding bracket 53 to slide left and right in the guide groove until the left connecting frame 54 on one foundation pit support plate 1 is inserted into the connecting slot of the right connecting frame 55 on another adjacent foundation pit support plate 1, and at the same time make the inner bolt hole correspond to the bolt insertion hole up and down, and then insert the fixing bolt into the inner bolt hole and the bolt insertion hole, so that the left connecting frame 54 and the right connecting frame 55 become a whole, completing the connection between the two adjacent anti-bending mechanisms 5, and the construction workers connect the anti-bending mechanisms 5 on the foundation pit support plates 1 on all working surfaces in the foundation pit as a whole according to the above method, so that the whole is a frame-shaped support structure, thereby supporting the foundation pit support plate 1 to prevent it from bending when subjected to force.

[0036] Then the construction workers insert the connecting support rod 10 into the installation bracket 8 on the foundation pit support plate 1, and then fix it with fixing bolts. In this process, the construction workers insert the ground nails 4 on the support seat 6 into the bottom of the foundation pit, thereby quickly installing the auxiliary support mechanism and the foundation pit support plate 1. The construction workers install all auxiliary support mechanisms on the corresponding foundation pit support plates 1 according to the above method.

[0037] When all the auxiliary support mechanisms are installed on the foundation pit support plate 1, the construction workers insert the screw 112 on one support seat 6 into the interior of the connecting frame 113 on the other support seat 6, and then rotate the turntable 114. The rotation of the turntable 114 drives the screw 112 to rotate. The rotation of the screw 112 enables it to be threadedly connected with the threaded connection hole in the connecting frame 113, thereby connecting the two support seats 6 to form a whole.

[0038] When all the components on the foundation pit support plate 1 are connected, it becomes a whole. Since all the components are connected, there are more connection points and the integrity is stronger. After the foundation pit support plate 1 is subjected to pressure, the various components are connected together to bear the pressure together, making it more resistant to pressure and providing better support for the foundation pit. It can effectively prevent the collapse of the foundation pit caused by the bending or tipping of the foundation pit support plate 1 after being compressed.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A foundation pit support device that can effectively prevent foundation pit collapse, characterized in that: It comprises a foundation pit support plate (1), The left and right sides of the foundation pit support plate (1) are both fixedly connected with support plate splicing connectors (9), and the support plate splicing connectors (9) on adjacent foundation pit support plates (1) are detachably connected to each other; An anti-bending mechanism (5) is fixedly provided on the foundation pit supporting plate (1), the anti-bending mechanism (5) extends in the left-right direction, and the anti-bending mechanisms (5) on adjacent foundation pit supporting plates (1) are detachably connected to each other; A connecting crossbeam (7) is fixedly connected to the front side of the foundation pit support plate (1), and the connecting crossbeam (7) extends in the left-right direction. The connecting crossbeam (7) is detachably connected to one end of the auxiliary support mechanism, and the other end of the auxiliary support mechanism extends downward and is used to support the bottom of the foundation pit. Adjacent auxiliary support mechanisms are detachably connected to each other. The lower end of the foundation pit support plate (1) is fixedly connected to a mounting base (2), and the lower surface of the mounting base (2) is fixedly connected to an embedded pile (3).

2. A foundation pit support device capable of effectively preventing foundation pit collapse according to claim 1, characterized in that: The support plate splicing connector (9) comprises a fixed support frame (91), the fixed support frame (91) is fixedly connected to the right side surface of the foundation pit support plate (1), a support plug-in frame (95) is fixedly connected to the right side surface of the foundation pit support plate (1), and the support plug-in frame (95) is located below the fixed support frame (91); A connecting bracket (98) is fixedly connected to the left side of the foundation pit support plate (1), and a locking socket adapted to the locking bracket (94) is provided on the connecting bracket (98). The connecting bracket (98) can be inserted into the gap between the fixed support frame (91) and the support bracket (95); A locking piece extending in the up-down direction is provided on the fixed support frame (91); the length of the locking piece is adjustable and the lower end of the locking piece can extend to the bottom of the fixed support frame (91) and be inserted into the locking socket.

3. A foundation pit support device capable of effectively preventing foundation pit collapse according to claim 2, characterized in that: The locking member comprises a connecting column (92), wherein the connecting column (92) extends in the up-down direction, the lower end of the connecting column (92) is fixedly connected to a slide frame (93), the lower end of the slide frame (93) is fixedly connected to a locking plug frame (94), and the locking plug frame (94) extends in the up-down direction, the upper end of the connecting column (92) is fixedly connected to a handle (97), the handle (97) is located outside the fixed support frame (91), a slide groove is provided inside the fixed support frame (91), the slide groove extends in the up-down direction, the inside of the slide groove is connected to the socket, the lower end of the connecting column (92) is located inside the slide groove, the outer surface of the slide frame (93) is slidably connected to the inside of the slide groove, a spring (96) is fixedly connected between the upper surface of the slide frame (93) and the top wall of the slide groove, and the spring (96) is sleeved on the connecting column (92).

4. The foundation pit support device capable of effectively preventing foundation pit collapse according to claim 1 is characterized in that: The anti-bending mechanism (5) comprises a telescopic frame with both left and right ends being telescopic, the telescopic frame being fixedly connected to the front side of the foundation pit support plate (1), the telescopic frame being provided with a stopper for locking the telescopic frame from telescoping in the left and right directions, and the telescopic frame being provided with a telescopic frame splicing piece for detachably connecting with a telescopic frame on an adjacent foundation pit support plate (1).

5. A foundation pit support device capable of effectively preventing foundation pit collapse according to claim 4, characterized in that: The telescopic frame comprises a main supporting crossbeam (51), a right sliding bracket (52) and a left sliding bracket (53); a guide slide groove extending in the left-right direction is provided inside the main supporting crossbeam (51); a left sliding bracket (53) extending in the left-right direction is slidably provided at the left end of the guide slide groove; and a right sliding bracket (52) extending in the left-right direction is slidably provided at the right end of the guide slide groove.

6. A foundation pit support device capable of effectively preventing foundation pit collapse according to claim 5, characterized in that: The stopper comprises a threaded locking opening (56) and a locking bolt (57); the upper surface of the main support beam (51) is provided with two bolt sockets; the upper surfaces of the right sliding bracket (52) and the left sliding bracket (53) are provided with a plurality of threaded locking openings (56) spaced apart from each other on the left and right sides; the inside of the threaded locking openings (56) is provided with a threaded structure matching the locking bolt (57); the two bolt sockets and the inside of the corresponding threaded locking openings (56) above and below are both plugged with locking bolts (57); and the inside of the threaded locking openings (56) are both threadedly connected to the lower ends of the corresponding locking bolts (57).

7. The foundation pit support device capable of effectively preventing foundation pit collapse according to claim 5 is characterized in that: The telescopic frame assembly comprises a left connecting frame (54) and a right connecting frame (55), wherein the left connecting frame (54) is fixedly connected to the left end of the left sliding frame (53), and the right connecting frame (55) is fixedly connected to the right end of the right sliding frame (52), the left connecting frame (54) and the right connecting frame (55) are located in corresponding positions on the left and right sides, and the right connecting frame (55) is provided with a connecting slot adapted to the left connecting frame (54), the upper surface of the left connecting frame (54) is provided with an inner bolt hole which is transparent from top to bottom, and the right connecting frame (55) is provided with a bolt insertion hole which is transparent from top to bottom; When the left connecting frame (54) is inserted into the connecting slot of the right connecting frame (55), the inner bolt hole corresponds to the bolt insertion hole in the upper and lower parts, and a fixing bolt is inserted into both the inner bolt hole and the bolt insertion hole.

8. The foundation pit support device capable of effectively preventing foundation pit collapse according to claim 1 is characterized in that: The auxiliary support mechanism comprises a mounting bracket (8), the mounting bracket (8) being fixedly connected to the front side of the connecting crossbeam (7), the mounting bracket (8) being detachably connected to the upper end of the connecting support rod (10), the lower end of the connecting support rod (10) being fixedly connected to a support seat (6), the support seat (6) being fixedly connected to a support seat connecting mechanism (11), the support seat connecting mechanism (11) being used to detachably splice two adjacent support seats (6).

9. A foundation pit support device capable of effectively preventing foundation pit collapse according to claim 8, characterized in that: The support seat connection mechanism (11) comprises a screw rod insertion rack (111), the screw rod insertion rack (111) is fixedly connected to the left end of the front side surface of the support seat (6), a screw rod (112) is inserted into the screw rod insertion rack (111), a rotating disk (114) is fixedly connected to the right end of the screw rod (112), a connecting rack (113) is fixedly connected to the right end of the front side surface of the support seat (6), and a threaded connection hole matching the screw rod (112) is provided inside the connecting rack (113).

10. The foundation pit support device capable of effectively preventing foundation pit collapse according to claim 8, characterized in that: A plurality of ground nails (4) are fixedly connected to the lower surface of the support seat (6).

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