A foundation pit support and reinforcement device and a support method

Abstract

The present invention relates to the technical field of foundation pit support, and specifically relates to a foundation pit support and reinforcement device and a support method. The device includes short columns and diaphragms arranged on the short columns, and further includes: a stress plate rotatably arranged on the diaphragm. By rotating a handwheel, the stress plate is deflected to fit foundation pit walls with different slopes, and then a rectangular airbag is inflated so that after expansion, it fills the gap between the stress plate and the foundation pit wall, replacing the function of filling soil. This device eliminates the need for soil filling, and is simple and convenient to install and disassemble. At the same time, if the rectangular airbag continuously receives the active earth pressure of the foundation pit wall, when the pressure reaches a certain value, a release component is used to deflect and release the diagonal strut to assist in supporting the diaphragm, thereby improving the support capacity of the main body of the device. At the same time, when the rectangular airbag continuously receives the active earth pressure of the foundation pit wall, it drives the deflection rod to deflect to deploy an elastic ribbon, reminding the staff that the device is continuously under pressure and warning the staff that the diagonal strut may deflect and be released.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and particularly to a foundation pit support reinforcement device and a support method. Background Art

[0002] In the foundation pit engineering of slope excavation, in the face of the problem that the slope width is insufficient due to space limitations in some sections, more refined and stable support measures are often required. At this time, the short column cross diaphragm support system becomes an effective solution. When implementing this system, first, the specially made short columns are accurately inserted into the ground near the lower part of the slope. These short columns, as the foundation of the support structure, need to have sufficient strength and stability. Subsequently, the cross diaphragms are carefully placed between the short columns and the slope, playing a key role in retaining soil and bearing weight. In order to further enhance the overall stability, it is also necessary to fill the gap between the cross diaphragm and the slope with soil. This not only helps to resist the lateral pressure and evenly disperse the soil pressure, but also improves the overall safety performance;

[0003] However, it should be noted that the process of filling the soil between the cross diaphragm and the slope is not easy. It requires construction workers to have a high degree of professional skills and patience to ensure the uniformity and compactness of the filled soil. This process is often time-consuming and labor-intensive. More importantly, when disassembling the short column cross diaphragm support system later, if not careful, it may cause the previously carefully filled soil to collapse, which will not only damage the completed engineering structure, but also pose a serious threat to the surrounding construction environment and personnel safety, with construction hazards that cannot be ignored. For this reason, we propose a foundation pit support reinforcement device and a support method. Summary of the Invention

[0004] One technical problem to be solved by this application is: how to design a support structure that is easy to install and disassemble.

[0005] To solve the above technical problem, the embodiment of this application provides a foundation pit support reinforcement device, including short columns and cross diaphragms arranged on the short columns, and further including:

[0006] A force-bearing plate, rotatably arranged on the cross diaphragm, and a deflection assembly connected to the force-bearing plate is arranged on the cross diaphragm, which is used to drive the force-bearing plate to deflect relative to the cross diaphragm and fit the foundation pit wall;

[0007] A rectangular airbag, fixedly connected to one side of the force-bearing plate and conductively connected to an external inflation device, and the external inflation device is used to inflate the rectangular airbag to fill the gap between the force-bearing plate and the foundation pit wall;

[0008] An inclined strut, rotatably connected to the cross diaphragm;

[0009] The release component is arranged on the diaphragm and connected with the diagonal support rod and the rectangular airbag. When the active earth pressure of the foundation pit wall on the rectangular airbag increases to a certain value, the release component is triggered to release the diagonal support rod to actively deflect and support the diaphragm.

[0010] In some embodiments, the bottom end of the force-bearing plate is fixedly connected to a shaft 1, and the shaft 1 is rotatably connected to the diaphragm;

[0011] The deflection assembly includes a second shaft fixedly connected to one side of the force-bearing plate, a first slide groove is provided on the transverse partition, a slider is slidably connected in the first slide groove, one end of the slider is also fixedly connected to the second shaft, a connecting rod is rotatably connected between the two second shafts, and sliding the slider drives the force-bearing plate to deflect;

[0012] A shaft three is rotatably connected to the transverse partition, a screw rod is fixedly connected to the shaft three, and the screw rod passes through the slider. Rotating the shaft three drives the slider to move.

[0013] In some embodiments, the connecting rod is symmetrically arranged with respect to the diaphragm, and two sliders, screws, and shafts 3 are provided corresponding to the connecting rods. One end of each of the two shafts 3 passes through the diaphragm and is fixedly connected to a beveled toothed disc 1. The diaphragm is rotatably connected with a shaft 4, and both ends of the shaft 4 are fixedly connected to a beveled toothed disc 2. The two beveled toothed discs 2 are meshed with the two beveled toothed discs 1 correspondingly.

[0014] A hand wheel is fixedly connected to one end of the shaft three.

[0015] In some embodiments, one end of the diagonal support rod is fixedly connected to the shaft five, the shaft five is rotatably connected to the transverse partition, and a torsion spring is sleeved on the shaft five, and the two ends of the torsion spring are respectively fixed to the shaft five and the transverse partition, and when the partition is in the retracted state, the torsion spring is in a torsion state under force;

[0016] A locking piece is provided on the transverse partition for locking the shaft five.

[0017] In some embodiments, the locking member comprises a rotating disk fixedly connected to the shaft five, the rotating disk is provided with a through hole one, the transverse partition is fixedly connected with a sliding sleeve, a locking pin is slidably connected in the sliding sleeve, and one end of the locking pin is located in the through hole one to lock the shaft five;

[0018] A spring 1 is sleeved on the locking pin, and two ends of the spring 1 are respectively fixed to the locking pin and the inner wall of the sliding sleeve. The locking pin is pulled to drive it to disengage from the through hole 1 to release the locking of the shaft 5.

[0019] In some embodiments, the release component includes a syringe fixedly connected to the diaphragm. A gas guide pipe is conductively connected to the syringe, and the gas guide pipe is conductively connected to a rectangular airbag. A piston is slidably connected in the syringe. One end of the piston is fixedly connected to a push rod, and one end of the push rod slidably passes through the syringe. A second spring is sleeved on the push rod, and two ends of the second spring are respectively in contact with and abutted against the piston and the inner wall of the syringe;

[0020] One end of the push rod is fixedly connected to a strip-shaped plate, and a guide groove member is formed on the strip-shaped plate. One end of the locking pin is fixedly connected to a cylindrical protrusion located in the guide groove member. Moving the push rod drives the cylindrical protrusion to slide along the guide groove member to drive the locking pin to move out.

[0021] In some embodiments, the guide groove member includes a vertical sliding groove formed on the strip-shaped plate. One end of the cylindrical protrusion is located in the vertical sliding groove, and moving the strip-shaped plate enables the cylindrical protrusion to slide along the vertical sliding groove;

[0022] The strip-shaped plate is provided with an inclined sliding groove communicating with the vertical sliding groove. Moving the strip-shaped plate drives the cylindrical protrusion to slide relative to the inclined sliding groove to drive the locking pin to move.

[0023] In some embodiments, a deflection rod is arranged on one side of the diaphragm. One end of the deflection rod is fixedly connected to a shaft six, and the shaft six is rotatably connected to the diaphragm. A plurality of elastic ribbons are fixedly connected between the deflection rod and the diaphragm. During the process of moving the push rod, the deflection rod is rotated to stretch the elastic ribbons;

[0024] A dial plate is fixedly connected to the shaft six. One end of the strip-shaped plate is fixedly connected to an L-shaped plate. A guide groove is formed at one end of the L-shaped plate. One end of the dial plate is rotatably connected to a shaft seven located in the guide groove. Moving the strip-shaped plate drives the deflection rod to deflect;

[0025] A trapezoidal limiting block is fixedly connected to the diaphragm for limiting the deflected diagonal brace;

[0026] A through hole two is formed on the rotating disc, and a horizontal sliding groove communicating with the inclined sliding groove is formed on the strip-shaped plate.

[0027] In some embodiments, one end of the diagonal brace is fixedly connected to a rectangular support plate, and a plurality of spikes are installed on one side of the rectangular support plate.

[0028] A foundation pit support method includes the following steps:

[0029] S1. Short columns are constructed on the foundation pit slope platform, and then the diaphragm is installed on the short columns;

[0030] S2. Rotate the handwheel to adjust the deflection angle of the stress plate to fit the foundation pit wall;

[0031] S3. Use an external inflation device to inflate the rectangular airbag to fill the gap between the stress plate and the foundation pit wall, completing the support of the foundation pit wall.

[0032] The present invention has at least the following beneficial effects:

[0033] 1. By rotating the handwheel to drive the deflection of the stress plate to fit the foundation pit wall with different inclination degrees, and then inflating the rectangular airbag so that it expands to fill the gap between the stress plate and the foundation pit wall, to replace the function of filling soil. This device does not require filling soil, and at the same time, the installation and disassembly are simple and convenient.

[0034] 2. During the working process of this device, if the rectangular airbag continuously receives the active earth pressure of the foundation pit wall, when the pressure reaches a certain value, the release component will be used to deflect and release the diagonal strut to assist in supporting the cross diaphragm, thereby improving the support capacity of the main body of the device.

[0035] 3. When the rectangular airbag of this device continuously receives the active earth pressure of the foundation pit wall, it will drive the deflection of the deflection rod to unfold the elastic ribbon, to remind the staff that the device is continuously under pressure, and at the same time, to warn the staff that the diagonal strut may deflect and release. Brief Description of the Drawings

[0036] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0037] Figure 2 is of the present invention Figure 1 is a schematic diagram of the sectional structure;

[0038] Figure 3 is of the present invention Figure 2 is a schematic diagram of the sectional structure;

[0039] Figure 4 is of the present invention Figure 1 is a schematic diagram of the sectional structure;

[0040] Figure 5 is of the present invention Figure 4 is a schematic diagram of the sectional structure;

[0041] Figure 6 is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0042] In the figure: 1 - short column; 11 - transverse diaphragm; 2 - stress plate; 3 - deflection assembly; 4 - rectangular airbag; 5 - diagonal brace; 6 - release assembly; 31 - shaft one; 32 - shaft two; 33 - chute one; 34 - slider; 35 - connecting rod; 36 - shaft three; 37 - screw; 38 - helical disk one; 39 - shaft four; 41 - helical disk two; 42 - handwheel; 43 - shaft five; 44 - torsion spring; 45 - locking part; 46 - rotating disk; 47 - through hole one; 48 - sliding sleeve; 49 - locking pin; 51 - spring one; 52 - syringe; 53 - air duct; 54 - piston; 55 - push rod; 56 - spring two; 57 - strip plate; 58 - guide groove part; 59 - cylindrical convex; 61 - vertical chute; 62 - inclined chute; 63 - deflection rod; 64 - shaft six; 65 - elastic ribbon; 66 - paddle; 67 - L-shaped plate; 68 - guide groove; 69 - trapezoidal limit block; 71 - through hole two; 72 - horizontal chute; 73 - rectangular support plate; 74 - spike; 75 - shaft seven. Specific implementation mode

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1: Please refer to Figures 1 - 5 , the present invention provides a technical solution: a foundation pit support and reinforcement device, including a short column 1 and a transverse diaphragm 11 arranged on the short column 1, and further including:

[0045] A stress plate 2, rotatably arranged on the transverse diaphragm 11, and a deflection assembly 3 connected to the stress plate 2 is arranged on the transverse diaphragm 11, which is used to drive the stress plate 2 to deflect and fit the foundation pit wall relative to the transverse diaphragm 11;

[0046] A rectangular airbag 4, fixedly connected to one side of the stress plate 2 and conductively connected to an external inflation device, and the external inflation device is used to inflate the rectangular airbag 4 to fill the gap between the stress plate 2 and the foundation pit wall;

[0047] A diagonal brace 5, rotatably connected to the transverse diaphragm 11;

[0048] A release assembly 6, arranged on the transverse diaphragm 11 and connected to the diagonal brace 5 and the rectangular airbag 4. After the active earth pressure of the foundation pit wall on the rectangular airbag 4 continuously increases to a certain value, the release assembly 6 is triggered to release the diagonal brace 5 to actively deflect and support the transverse diaphragm 11;

[0049] Specifically, when the device is in use, the force-bearing plate 2 is driven to deflect by rotating the handwheel 42 to fit the foundation pit walls with different slopes. Then, the rectangular airbag 4 is inflated so that after expansion, it fills the gap between the force-bearing plate 2 and the foundation pit wall, replacing the function of filling soil. This device eliminates the need for filling soil, and is simple and convenient to install and disassemble. Meanwhile, during the operation of this device, if the rectangular airbag 4 continuously receives the active earth pressure from the foundation pit wall, when the pressure reaches a certain value, the release component 6 will be used to deflect and release the diagonal strut 5 to assist in supporting the diaphragm 11, thereby improving the support capacity of the device main body. At the same time, when the rectangular airbag 4 continuously receives the active earth pressure from the foundation pit wall, it will drive the deflection rod 63 to deflect to deploy the elastic ribbon 65, reminding the staff that the device is continuously under pressure and warning the staff that the diagonal strut 5 may deflect and be released.

[0050] The bottom end of the force-bearing plate 2 is fixedly connected to a shaft one 31, and the shaft one 31 is rotatably connected to the diaphragm 11 through a bearing.

[0051] The deflection assembly 3 includes a shaft two 32 fixedly connected to one side of the force-bearing plate 2. A chute one 33 is opened on the diaphragm 11, and a slider 34 is slidably connected in the chute one 33. One end of the slider 34 is also fixedly connected to the shaft two 32. A connecting rod 35 is rotatably connected between the two shaft two 32s. Sliding the slider 34 drives the force-bearing plate 2 to deflect relative to the diaphragm 11 by using the connecting rod 35.

[0052] A shaft three 36 is rotatably connected to the diaphragm 11 through a bearing. A screw rod 37 is fixedly connected to the shaft three 36. The screw rod 37 passes through the slider 34 and is threadedly connected to it. Rotating the shaft three 36 drives the screw rod 37 to rotate, thereby driving the slider 34 to move.

[0053] Two connecting rods 35 are symmetrically arranged relative to the diaphragm 11, and two corresponding sliders 34, screw rods 37, and shaft three 36s are provided for each connecting rod 35 to improve the stability of the device. One end of each of the two shaft three 36s passes through the diaphragm 11 and is fixedly connected to a helical gear one 38. A shaft four 39 is rotatably connected to the diaphragm 11 through a bearing. Two helical gear two 41s are fixedly connected to both ends of the shaft four 39. The two helical gear two 41s are correspondingly meshed with the two helical gear one 38s. The thread directions of the two screw rods 37 are opposite.

[0054] A handwheel 42 is fixedly connected to one end of the shaft three 36.

[0055] During specific operation, the construction personnel arbitrarily rotate one handwheel 42. The two shaft three 36s are driven to rotate synchronously through the cooperation of the helical gear one 38 and the helical gear two 41, driving the two screw rods 37 to rotate, and then driving the two sliders 34 to slide, so as to push the force-bearing plate 2 to deflect and adjust by using the two connecting rods 35.

[0056] One end of the diagonal brace 5 is fixedly connected with a fifth shaft 43. The fifth shaft 43 is rotatably connected with the transverse diaphragm 11 through a bearing. A torsion spring 44 is sleeved on the fifth shaft 43. Two ends of the torsion spring 44 are respectively fixedly connected with the fifth shaft 43 and the transverse diaphragm 11. When the partition is in the retracted state, the torsion spring 44 is in a stressed and twisted state;

[0057] And a locking member 45 is arranged on the transverse diaphragm 11 for locking the fifth shaft 43 to maintain the retracted state of the diagonal brace 5.

[0058] The locking member 45 includes a rotating disk 46 fixedly connected to the fifth shaft 43. A first through hole 47 is formed in the rotating disk 46. A sliding sleeve 48 is fixedly connected to the transverse diaphragm 11. A locking pin 49 is slidably connected in the sliding sleeve 48. One end of the locking pin 49 is located in the first through hole 47 to lock the fifth shaft 43;

[0059] And a first spring 51 is sleeved on the locking pin 49. Two ends of the first spring 51 are respectively fixedly connected with the locking pin 49 and the inner wall of the sliding sleeve 48. Pulling the locking pin 49 drives it to disengage from the first through hole 47 to release the locking of the fifth shaft 43. At the same time, the first spring 51 is compressed and contracted to provide a self - restoring elastic force for it.

[0060] The release assembly 6 includes a syringe 52 fixedly connected to the transverse diaphragm 11. A gas guide pipe 53 is conductively connected to the syringe 52. The gas guide pipe 53 is conductively connected to the rectangular airbag 4. A piston 54 is slidably connected in the syringe 52. One end of the piston 54 is fixedly connected with a push rod 55. One end of the push rod 55 slidably passes through the syringe 52. A second spring 56 is sleeved on the push rod 55. Two ends of the second spring 56 are respectively in contact with and abutted against the piston 54 and the inner wall of the syringe 52;

[0061] And a strip - shaped plate 57 is fixedly connected to one end of the push rod 55. A guide groove member 58 is formed in the strip - shaped plate 57. One end of the locking pin 49 is fixedly connected with a cylindrical protrusion 59 located in the guide groove member 58. Moving the push rod 55 drives the cylindrical protrusion 59 to slide along the guide groove member 58 to drive the locking pin 49 to move and pull out.

[0062] The guide groove member 58 includes a vertical sliding groove 61 formed in the strip - shaped plate 57. One end of the cylindrical protrusion 59 is located in the vertical sliding groove 61. Moving the strip - shaped plate 57 enables the cylindrical protrusion 59 to slide along the vertical sliding groove 61;

[0063] An inclined sliding groove 61 is formed in the strip - shaped plate 57 and is conductively connected to the vertical sliding groove 61. Moving the strip - shaped plate 57 drives the cylindrical protrusion 59 to slide relative to the inclined sliding groove 61 to drive the locking pin 49 to move;

[0064] During the specific operation, when the active earth pressure of the foundation pit wall on the support device becomes larger and larger, it will squeeze the rectangular airbag 4 and increase its internal pressure. Then, it will push the piston 54 to move and compress the second spring 56 at the same time, and also push the strip plate 57 to move. In the initial moving distance of the strip plate 57, the cylindrical protrusion 59 slides along the vertical chute 61. During this process, the locking pin 49 will not be driven to move and unlock. Only when the air pressure in the rectangular airbag 4 reaches a certain value, the inclined chute 61 on the strip plate 57 will push the cylindrical protrusion 59 to move, so as to drive the locking pin 49 to move out of the first through hole 47. Subsequently, the torsion spring 44 resets to drive the inclined strut 5 to deflect and turn out quickly to assist in supporting the cross partition 11.

[0065] On one side of the cross partition 11, a deflection rod 63 is arranged. One end of the deflection rod 63 is fixedly connected with a sixth shaft 64. The sixth shaft 64 is rotationally connected with the cross partition 11 through a bearing. And between the deflection rod 63 and the cross partition 11, a plurality of elastic ribbons 65 are fixedly connected. During the process of moving the push rod 55, the deflection rod 63 is rotated to stretch the elastic ribbons 65, so as to remind the staff that the device is continuously under pressure, and at the same time warn the staff that the inclined strut 5 may deflect and release.

[0066] A dial plate 66 is fixedly connected to the sixth shaft 64. One end of the strip plate 57 is fixedly connected with an L-shaped plate 67. A guide groove 68 is opened at one end of the L-shaped plate 67. One end of the dial plate 66 is rotationally connected with a seventh shaft 75 whose one end is located in the guide groove 68. The seventh shaft 75 is slidably connected with the inner wall of the guide groove 68. Moving the strip plate 57 drives the L-shaped plate 67 to move, and then drives the dial plate 66 to deflect, so as to drive the sixth shaft 64 to rotate, and drive the deflection rod 63 to deflect.

[0067] A trapezoidal limit block 69 is fixedly connected to the cross partition 11, which is used to limit the deflected inclined strut 5 to improve the stability of the device.

[0068] And a second through hole 71 is opened on the rotating disc 46. A transverse chute 72 communicated with the inclined chute 61 is opened on the strip plate 57. Specifically, after the inclined strut 5 deflects and turns out, the second through hole 71 will be aligned with the locking pin 49. At this time, the locking pin 49 is reset by the first spring 51 to drive it to insert into the second through hole 71. At this time, the cylindrical protrusion 59 will slide along the transverse chute 72, and lock the deflected and turned-out inclined strut 5 again to improve the stability of the device.

[0069] Embodiment 2: Please refer to Figures 1 - 6 , the present invention provides a technical solution: Embodiment 2 is optimized on the basis of Embodiment 1;

[0070] One end of the inclined strut 5 is fixedly connected with a rectangular support plate 73. A plurality of spikes 74 are installed on one side of the rectangular support plate 73. When the inclined strut 5 deflects and turns out, the spikes 74 are used to insert into the soil to improve the stability of the device.

[0071] A foundation pit support method, comprising the following steps:

[0072] S1. Construct the short column 1 on the foundation pit slope platform, and then install the diaphragm 11 on the short column 1;

[0073] S2. Rotate the handwheel 42 to adjust the deflection angle of the stress plate 2 to fit the foundation pit wall;

[0074] S3. Use an external inflation device to inflate the rectangular airbag 4 to fill the gap between the stress plate 2 and the foundation pit wall, and complete the support of the foundation pit wall.

[0075] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0076] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention.

Claims

1. A foundation pit support and reinforcement device, comprising a short column (1) and a diaphragm (11) arranged on the short column (1), characterized in that: Also included are: The load-bearing plate (2) is rotatably arranged on the diaphragm (11), and the diaphragm (11) is provided with a deflection assembly (3) connected to the load-bearing plate (2) for driving the load-bearing plate (2) to deflect relative to the diaphragm (11) and to fit the foundation pit wall; A rectangular airbag (4) is fixedly connected to one side of the force-bearing plate (2) and is conductively connected to an external inflation device. The rectangular airbag (4) is inflated by the external inflation device to fill the gap between the force-bearing plate (2) and the foundation pit wall. The diagonal brace (5) is rotatably connected to the diaphragm (11); A release component (6) is arranged on the diaphragm (11) and connected to the diagonal support rod (5) and the rectangular airbag (4). When the active earth pressure of the foundation pit wall on the rectangular airbag (4) increases to a certain value, the release component (6) is triggered to release the diagonal support rod (5) to actively deflect and support the diaphragm (11); One end of the diagonal support rod (5) is fixedly connected to a fifth shaft (43), the fifth shaft (43) is rotatably connected to the transverse partition (11), and a torsion spring (44) is sleeved on the fifth shaft (43), and the two ends of the torsion spring (44) are respectively fixed to the fifth shaft (43) and the transverse partition (11), and when the transverse partition (11) is in a retracted state, the torsion spring (44) is in a torsion state under force; A locking member (45) is provided on the transverse partition (11) for locking the shaft five (43); The locking member (45) comprises a rotating disk (46) fixedly connected to the fifth shaft (43), the rotating disk (46) being provided with a through hole (47), a sliding sleeve (48) fixedly connected to the transverse partition (11), a locking pin (49) slidably connected in the sliding sleeve (48), one end of the locking pin (49) being located in the through hole (47) to lock the fifth shaft (43); A spring (51) is sleeved on the locking pin (49), and two ends of the spring (51) are respectively fixed to the locking pin (49) and the inner wall of the sliding sleeve (48), so that the locking pin (49) is pulled to disengage from the through hole (47) to release the locking of the shaft (43); The release assembly (6) comprises a syringe (52) fixedly connected to the diaphragm (11), an air guide tube (53) being conductively connected to the syringe (52), the air guide tube (53) being conductively connected to the rectangular air bag (4), a piston (54) being slidably connected inside the syringe (52), one end of the piston (54) being fixedly connected to a push rod (55), one end of the push rod (55) slidingly passing through the syringe (52), and a second spring (56) being sleeved on the push rod (55), the two ends of the second spring (56) respectively contacting and abutting against the piston (54) and the inner wall of the syringe (52); A strip plate (57) is fixedly connected to one end of the push rod (55), a guide groove (58) is provided on the strip plate (57), and one end of the locking pin (49) is fixedly connected to a cylindrical protrusion (59) whose end is located in the guide groove (58). Moving the push rod (55) drives the cylindrical protrusion (59) to slide along the guide groove (58), thereby driving the locking pin (49) to move and be pulled out.

2. The foundation pit support and reinforcement device according to claim 1, characterized in that: The bottom end of the force-bearing plate (2) is fixedly connected to a first shaft (31), and the first shaft (31) is rotatably connected to the transverse partition plate (11); The deflection assembly (3) includes a second shaft (32) fixedly connected to one side of the force-bearing plate (2). A first chute (33) is formed in the transverse partition plate (11). A slider (34) is slidably connected in the first chute (33). One end of the slider (34) is also fixedly connected to the second shaft (32). A connecting rod (35) is rotatably connected between the two second shafts (32). Sliding the slider (34) drives the force-bearing plate (2) to deflect; And a third shaft (36) is rotatably connected to the transverse partition plate (11). A screw rod (37) is fixedly connected to the third shaft (36). The screw rod (37) passes through the slider (34). Rotating the third shaft (36) drives the slider (34) to move.

3. The foundation pit support and reinforcement device according to claim 2, characterized in that: Two connecting rods (35) are symmetrically arranged relative to the transverse partition plate (11). And two sliders (34), screw rods (37), and third shafts (36) corresponding to the connecting rods (35) are provided. One end of each of the two third shafts (36) passes through the transverse partition plate (11) and is fixedly connected to a first bevel gear disk (38). A fourth shaft (39) is rotatably connected to the transverse partition plate (11). Two second bevel gear disks (41) are fixedly connected to both ends of the fourth shaft (39). The two second bevel gear disks (41) are correspondingly engaged with the two first bevel gear disks (38); And a hand wheel (42) is fixedly connected to one end of the third shaft (36).

4. The foundation pit support and reinforcement device according to claim 3, characterized in that: The guide groove member (58) includes a vertical chute (61) formed in the strip-shaped plate (57). One end of the cylindrical protrusion (59) is located in the vertical chute (61). Moving the strip-shaped plate (57) enables the cylindrical protrusion (59) to slide along the vertical chute (61); An inclined chute (62) communicating with the vertical chute (61) is formed in the strip-shaped plate (57). Moving the strip-shaped plate (57) drives the cylindrical protrusion (59) to slide relative to the inclined chute (62) to drive the locking pin (49) to move.

5. The foundation pit support and reinforcement device according to claim 4, characterized in that: A deflection rod (63) is arranged on one side of the transverse partition plate (11). One end of the deflection rod (63) is fixedly connected to a sixth shaft (64). The sixth shaft (64) is rotatably connected to the transverse partition plate (11). And a plurality of elastic ribbons (65) are fixedly connected between the deflection rod (63) and the transverse partition plate (11). During the process of moving the push rod (55), the deflection rod (63) is rotated to stretch the elastic ribbons (65); A dial plate (66) is fixedly connected to the sixth shaft (64). One end of the strip-shaped plate (57) is fixedly connected to an L-shaped plate (67). A guide groove (68) is formed at one end of the L-shaped plate (67). One end of the dial plate (66) is rotatably connected to a seventh shaft (75) with one end located in the guide groove (68). Moving the strip-shaped plate (57) drives the deflection rod (63) to deflect; A trapezoidal limit block (69) is fixedly connected to the transverse partition plate (11) for limiting the deflected diagonal brace (5); And a second through hole (71) is formed in the rotating disk (46). A transverse chute (72) communicating with the inclined chute (61) is formed in the strip-shaped plate (57).

6. The foundation pit support and reinforcement device according to claim 5, characterized in that: One end of the diagonal brace (5) is fixedly connected with a rectangular support plate (73), and a plurality of spikes (74) are installed on one side of the rectangular support plate (73).

7. A foundation pit support method, using the foundation pit support and reinforcement device as described in claim 6, characterized in that: The method includes the following steps: S1. Construct the short column (1) on the foundation pit slope platform, and then install the diaphragm (11) on the short column (1); S2. Rotate the hand wheel (42) to adjust the deflection angle of the stress plate (2) to fit the foundation pit wall; S3. Use an external inflation device to inflate the rectangular airbag (4) to fill the gap between the stress plate (2) and the foundation pit wall, and complete the support of the foundation pit wall.

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