A subgrade widening construction foundation pit support structure

Abstract

The application discloses a roadbed splicing construction foundation pit supporting structure and belongs to the technical field of foundation pit supporting structures, which comprises a foundation pit and further comprises: a supporting structure rotatably connected to the inner wall of the foundation pit; a driving structure connected between the two groups of supporting structures; a width adjusting structure connected to the two groups of supporting structures; and a step detection caliper located inside the foundation pit and used for detecting the excavation width and vertical height of the splicing step of the new and old roadbeds. The roadbed splicing construction foundation pit supporting structure adopts a plurality of supporting rods matched with a meshing type supporting belt to adhere to and support the side wall of the foundation pit, significantly increases the supporting contact area, and improves the overall stress stability of the foundation pit; the driving structure is used for realizing the overall quick displacement of the supporting device, and the supporting device does not need to be disassembled and reassembled, thereby guaranteeing the continuous and efficient construction of the foundation pit; the step detection caliper can synchronously detect the width and height dimensions of the step, the reading is intuitive, the structural dimensions of the roadbed excavation step are effectively guaranteed, the qualified rate and the work efficiency of the roadbed splicing construction are improved, and the construction quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support structure technology, specifically to a foundation pit support structure for roadbed widening construction. Background Technology

[0002] Chinese Patent (Publication No.: CN117626995A) discloses a prefabricated foundation pit support structure and its support method, including a support plate, an abutment component, and a support component. An abutment component is provided on one side of the support plate, and a support component is provided on the other side of the support plate. The support component supports the entire support structure, and the sliding support rod allows the overall support length and support angle of the support structure to be adjusted according to the actual situation, thereby improving the applicability of the support structure. The abutment component supports the sidewall of the foundation pit, allowing the abutment component to be tightly attached to the sidewall of the foundation pit, avoiding gaps between the abutment component and the sidewall of the foundation pit, and greatly improving the stability of the support.

[0003] The aforementioned technical solutions still have several shortcomings in practical applications of roadbed widening construction: First, the support structure is difficult to move. When the support position needs to be adjusted during continuous construction of the foundation pit, the support components must be disassembled and reinstalled, which is cumbersome and time-consuming, affecting the continuity and efficiency of construction. Second, the contact area between the support structure and the inner wall of the foundation pit is limited. When using distributed support plates, the concentrated stress can easily lead to excessive local stress on the sidewalls of the foundation pit, posing a risk of collapse. The stability of the support needs to be further improved. Therefore, in response to the special needs of roadbed widening construction, there is an urgent need for a foundation pit support structure with strong support stability and easy relocation to solve the above-mentioned problems of existing technologies. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the problem to be solved by the present invention is to provide a roadbed widening construction pit support structure to solve the problems in the background technology mentioned above.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A roadbed widening construction pit support structure includes a pit and further includes: a support structure rotatably connected to the inner wall of the pit for supporting the inner wall of the pit; a driving structure connected between two sets of support structures for driving the two sets of support structures to move within the inner wall of the pit; a width adjustment structure connected to the two sets of support structures for adjusting the width between the two sets of support structures; and a step detection caliper located inside the pit for detecting the excavation width and vertical height of the steps at the junction of the old and new roadbeds.

[0007] As a preferred embodiment of the present invention, the support structure includes: a first support, located on one inner wall of the foundation pit; a second support, located on the other inner wall of the foundation pit; a support rod, the end of which is rotatably connected to the first or the second support, and a support wheel is fixed on the support rod; and a support belt, wrapped around the surface of the support wheel, wherein the outer surface of the support wheel and the inner surface of the support belt are provided with concave teeth, and the concave teeth on the outer surface of the support wheel and the concave teeth on the inner surface of the support belt are engaged and connected.

[0008] As a preferred embodiment of the present invention, the driving structure includes: an outer bracket fixed to the side of the second support; an inner bracket fixed to the side of the first support, the end of the inner bracket being slidably connected to the inside of the outer bracket; a first C-shaped frame fixed to the outer bracket, with an outer rod rotatably connected inside; a second C-shaped frame fixed to the upper side of the inner bracket, with an inner rod rotatably connected inside, the inner rod being slidably connected to the inside of the outer rod via a spline shaft and a spline cylinder; and a bevel gear installed at the ends of the outer rod, the inner rod, and the support rod, the bevel gear at the end of the outer rod being connected to a set of support rods. The bevel gears at the ends of the guard rods are meshed together, and the bevel gear at the end of the inner rod is meshed with the bevel gear at the end of another set of guard rods; rack one is slidably connected to the surface of the outer bracket, and a pull ring is fixed at its end; ratchet one is fixed to the surface of the outer rod; gear one is rotatably connected to the surface of ratchet one, and gear one is meshed with rack one; pawl groove is opened in the inner wall of gear one, pawl one is slidably connected in the pawl groove, the end of pawl one is engaged in the inside of ratchet one, and a compression spring is installed in the pawl groove near the inside of pawl one.

[0009] As a preferred embodiment of the present invention, the width adjustment structure includes: a fixed frame, fixed to the inner side of the second support; a sliding frame, fixed to the inner side of the first support, with the end of the sliding frame slidably connected to the inside of the fixed frame; an extension seat, fixed to the second support, with the extension seat and the sliding frame connected by a multi-link; and a slider, slidably connected to the surface of the sliding frame, with one end connected to the inner side of the first support by a cylinder, and the other end rotatably connected to the multi-link by a rotating shaft.

[0010] As a preferred embodiment of the present invention, a locking structure is installed at the end of the support structure, the locking structure being used to lock the moving position of the support structure.

[0011] As a preferred embodiment of the present invention, the locking structure includes: a second ratchet, fixed to the end of the support rod; a pawl shaft, rotatably connected to the first or second support; a second pawl, mounted on the pawl shaft, with the end of the second pawl engaged with the second ratchet; and a support column, fixed to the first or second support, the support column being connected to the outside of the second pawl by a spring.

[0012] As a preferred embodiment of the present invention, the step detection caliper includes: a detection platform located inside the pit, with a sliding member slidably connected inside, the sliding member being connected to the inner wall of the upper side of the detection platform via an electric telescopic rod; a rotating pin rotatably connected to the sliding member, with a gear two fixed on its surface; guide rails connected to the outer surface of the detection platform, with lifting blocks slidably connected to the surfaces of two sets of guide rails; a rack two, located on the side of the lifting block, with both sets of rack two meshing with the gear two; a caliper detachably connected to the two sets of lifting blocks; a scale dial located on the outer surface of the gear two; and an indicator element disposed on the sliding member, the indicator element being located outside the scale dial.

[0013] As a preferred embodiment of the present invention, the sliding member is made of a transparent material.

[0014] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0015] The foundation pit support structure for the roadbed widening construction adopts multiple sets of support rods in conjunction with interlocking support belts to closely support the foundation pit sidewalls, significantly increasing the support contact area, improving the overall stress stability of the foundation pit, and preventing the collapse and deformation of the foundation pit sidewalls; the drive structure is used to realize the rapid overall relocation of the support device without disassembly and reassembly, ensuring continuous and efficient construction of the foundation pit.

[0016] The width adjustment structure can flexibly and adaptively adjust the spacing between the two sides of the support to adapt to different width foundation pit conditions; the one-way locking structure can reliably lock the rotation position of the support rod, avoid soil compression causing support loosening and failure, and ensure the safety and stability of the support; the step detection caliper can simultaneously detect the width and height of the step, with intuitive readings, effectively ensuring the structural dimensions of the roadbed excavation steps, improving the pass rate and the efficiency of roadbed widening construction, and ensuring construction quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a roadbed widening construction pit support structure provided for an embodiment of the present invention.

[0018] Figure 2 This is a top view of a roadbed widening construction pit support structure provided by the present invention.

[0019] Figure 3 This invention provides a schematic diagram of the support strip of a roadbed widening construction foundation pit support structure.

[0020] Figure 4 This is a schematic diagram of a width adjustment structure for a roadbed widening construction pit support structure provided by the present invention.

[0021] Figure 5 This is a schematic diagram of the driving structure of a roadbed widening construction pit support structure provided by the present invention.

[0022] Figure 6 This is a cross-sectional view of a rack in a roadbed widening construction pit support structure provided by the present invention.

[0023] Figure 7 This is a cross-sectional view of a roadbed widening construction pit support structure provided as an embodiment of the present invention.

[0024] Figure 8 for Figure 7 A magnified view of part A in the middle.

[0025] Figure 9 for Figure 3 A magnified view of part B in the middle section.

[0026] Figure 10 This invention provides a schematic diagram of a step inspection caliper for a roadbed widening construction pit support structure.

[0027] Attached reference numerals: 1. Excavation pit; 2. Support structure; 21. Support 1; 210. Support 2; 22. Support rod; 23. Support wheel; 24. Support belt; 25. Concave tooth; 3. Drive structure; 31. Outer support; 32. Inner support; 33. Chamfered frame 1; 331. Outer rod; 341. Rack 1; 342. Pull ring; 343. Gear 1; 344. Ratchet 1; 345. Pawl groove; 346. Pawl 1; 35. Chamfered frame 2; 36. Inner rod; 37. Bevel gear; 4. Width adjustment structure; 1. Fixed frame; 42. Sliding frame; 43. Extension seat; 44. Multi-link; 45. Slider; 46. Rotating shaft; 47. Cylinder; 5. Locking structure; 51. Ratchet II; 52. Pawl shaft; 53. Pawl II; 54. Support column; 55. Spring; 6. Step inspection caliper; 61. Inspection table; 62. Sliding component; 621. Electric telescopic rod; 63. Rotating pin; 64. Gear II; 65. Guide rail; 66. Lifting block; 661. Rack II; 67. Caliper; 68. Indicator; 69. Dial. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] See Figures 1-10A roadbed widening construction pit support structure includes a pit 1, and further includes: a support structure 2, rotatably connected to the inner wall of the pit 1, for supporting the inner wall of the pit 1; a driving structure 3, connected between two sets of support structures 2, for driving the two sets of support structures 2 to move within the inner wall of the pit 1; a width adjustment structure 4, connected to the two sets of support structures 2, for adjusting the width between the two sets of support structures 2; and a step detection caliper 6, located inside the pit 1, for detecting the excavation width and vertical height of the steps at the junction of the old and new roadbeds.

[0031] In one embodiment of the present invention, such as Figure 7 and Figure 8 As shown, the support structure 2 includes: support one 21, located on one side of the inner wall of the pit 1; support two 210, located on the other side of the inner wall of the pit 1; support rod 22, the end of which is rotatably connected to support one 21 or support two 210, and support wheel 23 is fixed on the support rod 22; support belt 24, which is wrapped around the surface of support wheel 23, and the outer surface of support wheel 23 and the inner surface of support belt 24 are provided with concave teeth 25, and the concave teeth 25 on the outer surface of support wheel 23 and the concave teeth 25 on the inner surface of support belt 24 are meshed and connected.

[0032] In this embodiment, as Figure 5 As shown, the drive structure 3 includes: an outer support 31, fixed to the side of the second support 210; an inner support 32, fixed to the side of the first support 21, with its end slidably connected to the inside of the outer support 31; a first frame 33, fixed to the outer support 31, with an outer rod 331 rotatably connected inside; a second frame 35, fixed to the upper side of the inner support 32, with an inner rod 36 rotatably connected inside, the inner rod 36 being slidably connected to the inside of the outer rod 331 via a spline shaft and a spline cylinder; and a bevel gear 37, installed at the ends of the outer rod 331, the inner rod 36, and the support rod 22, with the bevel gear 37 at the end of the outer rod 331 and a set of bevel gears 37 at the ends of the support rod 22 connected between them. The inner rod 36 is meshed with the bevel gear 37 at the end of the inner rod 36 and the bevel gear 37 at the end of another set of support rods 22. The rack 341 is slidably connected to the surface of the outer bracket 31, and a pull ring 342 is fixed at its end. The ratchet 344 is fixed to the surface of the outer rod 331. The gear 343 is rotatably connected to the surface of the ratchet 344, and the gear 343 is meshed with the rack 341. The pawl groove 345 is opened in the inner wall of the gear 343, and the pawl 346 is slidably connected in the pawl groove 345. The end of the pawl 346 is engaged in the inside of the ratchet 344, and a compression spring is installed in the pawl groove 345 near the inside of the pawl 346.

[0033] In this embodiment, during the roadbed widening construction, two sets of support 1 21 can support one side of the pit 1, and two sets of support 210 can support the other side of the pit 1. Support 1 21 and support 210 are equipped with multiple sets of support rods 22 and support wheels 23. The support wheels 23 are connected by support belts 24, so that the two sets of support belts 24 can support both sides of the pit 1 respectively. By supporting both sides of the pit 1 with the two sets of support belts 24, the contact area with the inner wall of the pit 1 is increased, thereby improving the overall stress stability of the pit, effectively preventing the collapse and deformation of the pit sidewall, and facilitating the excavation of the roadbed splicing steps inside the pit 1.

[0034] When the construction inside the foundation pit 1 is completed and the position of the support structure 2 needs to be moved, one end of the pull rope is tied to the pull ring 342 and the other end is tied to the tow truck. Starting the tow truck will cause it to move the rack 341 and the outer support 31 via the pull rope. During the movement of the rack 341, the rack 341 drives the gear 343 to rotate through meshing. At this time, the pawl 346 in the pawl groove 345 on the inner wall of the gear 343 is tightly engaged in the groove of the ratchet 344 under the elastic force of the compression spring, thereby causing the ratchet 344 and the outer rod 331 to rotate synchronously. The outer rod 331 drives the corresponding support rod 22 and support wheel 23 to rotate through the meshing transmission of the bevel gear 37 at its end; at the same time, the inner rod 36 is slidably connected to the outer rod 331 through the spline shaft and spline cylinder structure, and rotates synchronously with the outer rod 331. The bevel gear 37 at the end of the inner rod 36 drives the support rod 22 and support wheel 23 on the other side to rotate.

[0035] When the support wheel 23 rotates, the meshing of its surface teeth 25 with the inner surface teeth 25 of the support belt 24 drives the support belt 24 to roll along the inner wall of the pit 1, thereby moving the support structure 2. Simultaneously, the support structure 2 maintains a close and supportive relationship with the inner wall of the pit 1 during movement, preventing local instability of the pit sidewall. When it is necessary to stop the movement, the pull rope is released, and the pawl 346, under the action of the compression spring, remains engaged with the ratchet 344, preventing the outer rod 331 from rotating in the opposite direction and locking the position of the support structure 2.

[0036] When the position of the support structure 2 needs to be adjusted again, simply push the rack 341 to slide in the opposite direction on the surface of the outer bracket 31 by the tow truck. The rack 341 drives the pawl 346 in the pawl groove 345 to rotate in the opposite direction synchronously through the gear 343. At this time, the pawl 346 is squeezed and contracted into the pawl groove 345 by the inclined tooth surface of the ratchet 344, and no longer engages with the ratchet 344 for limiting. The gear 343 rotates freely and will not drive the outer rod 331 to reverse, thereby allowing the rack 341 to return to the initial position, which is convenient for the subsequent repositioning of the support structure 2 by pulling the rack 341 with the tow truck.

[0037] In one embodiment of the present invention, such as Figure 4 As shown, the width adjustment structure 4 includes: a fixed frame 41, fixed to the inner side of the second support 210; a sliding frame 42, fixed to the inner side of the first support 21, with the end of the sliding frame 42 slidably connected to the inside of the fixed frame 41; an extension seat 43, fixed to the second support 210, with the extension seat 43 and the sliding frame 42 connected by a multi-link 44; and a slider 45, slidably connected to the surface of the sliding frame 42, with one end connected to the inner side of the first support 21 by a cylinder 47, and the other end rotatably connected to the multi-link 44 by a rotating shaft 46.

[0038] By adopting the above technical solution, when it is necessary to increase the distance between the two sets of support structures 2, the cylinder 47 is activated, causing the piston rod of the cylinder 47 to extend and push the slider 45 to slide on the surface of the sliding frame 42 towards the extension seat 43. The slider 45 drives the multi-link 44 to unfold, thereby pushing support one 21 and support two 210 away from each other. At this time, the inner support 32 slides outward synchronously along the outer support 31, and the inner rod 36 extends outward along the splined cylinder of the outer rod 331 through the splined shaft, ensuring that the bevel gear 37 always remains in a meshed state and does not affect the transmission stability of the drive structure 3. When it is necessary to reduce the distance, the cylinder 47 is activated, causing the piston rod to retract and pull the slider 45 to slide in the opposite direction. The multi-link 44 folds, causing support one 21 to move closer to support two 210. The inner support 32 and the inner rod 36 retract synchronously, realizing flexible adjustment of the distance to adapt to the construction needs of foundation pits of different widths.

[0039] In one embodiment of the present invention, such as Figure 9 As shown, a locking structure 5 is installed at the end of the support structure 2, which is used to lock the moving position of the support structure 2. The locking structure 5 includes: a second ratchet 51, fixed to the end of the support rod 22; a pawl shaft 52, rotatably connected to the first support 21 or the second support 210; a second pawl 53, installed on the pawl shaft 52, with its end engaged with the second ratchet 51; and a support column 54, fixed to the first support 21 or the second support 210, which is connected to the outside of the second pawl 53 by a spring 55.

[0040] By adopting the above technical solution, when the support structure 2 needs to be moved, the drive component 34 drives the support rod 22 to rotate in the forward direction, and the ratchet 2 51 rotates in the forward direction with the support rod 22. At this time, the inclined surface of the teeth of the ratchet 2 51 generates a thrust on the pawl 2 53. This thrust overcomes the elastic preload of the spring 55 and pushes the pawl 2 53 to rotate outward around the pawl shaft 52, so that the engaging teeth of the pawl 2 53 disengage from the tooth gap of the ratchet 2 51.

[0041] When the support structure 2 moves to the designated position and is in a supported state, the support rod 22 and the support belt 24 tend to rotate in the opposite direction due to the pressure of the soil on the side wall of the pit. The ratchet 51 also tends to rotate in the opposite direction with the support rod 22. At this time, under the elastic preload of the spring 55, the pawl 53's locking teeth are firmly embedded in the tooth gap of the ratchet 51. Through the one-way locking structure of the ratchet 51 and the pawl 53, the reverse rotation of the ratchet 51 and the support rod 22 is restricted, thereby locking the support position of the support structure 2 and ensuring that the support belt 24 always maintains effective support force on the inner wall of the pit, avoiding support failure due to soil pressure.

[0042] In one embodiment of the present invention, such as Figure 10 As shown, the step detection caliper 6 includes: a detection platform 61 located inside the pit 1, with a sliding member 62 slidably connected inside, the sliding member 62 being connected to the upper inner wall of the detection platform 61 via an electric telescopic rod 621; a rotating pin 63 rotatably connected to the sliding member 62, with a gear 64 fixed on its surface; guide rails 65 connected to the outer surface of the detection platform 61, with lifting blocks 66 slidably connected to the surfaces of two sets of guide rails 65; a rack 661 located on the side of the lifting blocks 66, with both sets of racks 661 meshing with the gear 64; a caliper 67 detachably connected to the two sets of lifting blocks 66 via quick-release bolts; a scale 69 located on the outer surface of the gear 64; and an indicator 68 located on the sliding member 62, outside the scale 69. In this embodiment, the sliding member 62 is made of transparent material to facilitate observation of the readings on the scale 69.

[0043] By adopting the above technical solution, when it is necessary to inspect the excavation width and vertical height of the splicing steps of the old and new roadbeds in the foundation pit 1, the inspection platform 61 is first placed on the flat upper base surface at the connection of the old and new roadbed splicing steps, and one end of the two sets of calipers 67 is attached to one side vertical sidewall of the old and new roadbed splicing steps. Then, the electric telescopic rod 621 is activated. The electric telescopic rod 621 drives the sliding member 62 to slide smoothly downward in the inspection platform 61 according to the preset stroke. When the sliding member 62 slides, it will drive the two sets of racks 661 connected to it to slide downward. The racks 661 will drive the lifting blocks 66 to slide downward on the surface of the guide rail 65 until the calipers 67 at the ends of the two sets of lifting blocks 66 contact the old and new roadbed splicing steps respectively. The calipers 67 are specifically scale rulers, and the transverse width is inspected by attaching to the horizontal excavation surface of the steps.

[0044] When the calipers 67 at the ends of the two sets of lifting blocks 66 contact the joint steps of the old and new roadbeds, due to the difference in height between the old and new roadbed joint steps, the caliper 67 closer to the old roadbed first contacts the horizontal top surface of the old roadbed step and stops moving downwards, while the caliper 67 closer to the new roadbed continues to slide downwards with the lifting block 66 until it fits against the vertical end face of the new roadbed step. At this time, the continued downward movement of the lifting block 66 on the new roadbed side will cause the rack 661 on its side to move relative to the gear 64, thereby driving the gear 64 to drive the rotating pin 63 to rotate. The gear 64 simultaneously drives the rack 661 on the other side and the corresponding lifting block 66 to adjust their height, ensuring that both sets of calipers 67 are in close contact with the step detection surface. When gear 64 rotates, it will drive the dial 69 on its outer end face to rotate synchronously. The indicator 68 (red pointer) on the sliding member 62 will point to the corresponding scale relative to the dial 69. By reading the scale on the dial 69 of the indicator 68, the vertical height of the splicing step of the new and old roadbed can be detected simultaneously, thereby realizing the integrated synchronous detection of the excavation width and vertical height of the splicing step of the new and old roadbed.

[0045] Furthermore, the caliper 67 can be easily disassembled using quick-release bolts, allowing for the replacement of calipers 67 with different measuring ranges to meet the inspection needs of steps of different sizes.

[0046] The working principle of this invention is as follows: During the roadbed widening construction, the two sets of support belts 24 on the surfaces of support one 21 and support two 210 can respectively support both sides of the pit 1, increasing the contact area with the inner wall of the pit 1. When it is necessary to move the position of the support structure 2, by tying one end of the rope to the pull ring 342 and the other end to the tow truck, the tow truck is started. The tow truck will drive the rack one 341 and the outer bracket 31 to move through the pull rope, thereby causing the support wheels 23 inside support one 21 and support two 210 to rotate. Through the meshing action of the support wheels 23 and the concave teeth 25 on the surface of the support belt 24, the support belt 24 is driven to roll along the inner wall of the pit 1, realizing the movement of the support structure 2. There is no need to disassemble and reassemble the support structure 2, ensuring continuous and efficient construction of the pit 1.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roadbed widening construction pit support structure, comprising a pit (1), characterized in that, Also includes: The support structure (2) is rotatably connected to the inner wall of the pit (1) and is used to support the inner wall of the pit (1); The driving structure (3) is connected between the two sets of support structures (2) and is used to drive the two sets of support structures (2) to move within the inner wall of the pit (1); Width adjustment structure (4) is connected to the two sets of support structures (2) and is used to adjust the width between the two sets of support structures (2); The step inspection caliper (6) is located inside the foundation pit (1) and is used to inspect the excavation width and vertical height of the steps where the old and new roadbeds are spliced.

2. The roadbed widening construction pit support structure according to claim 1, characterized in that, The support structure (2) includes: Support 1 (21) is located on one side of the inner wall of the pit (1); Support 2 (210) is located on the inner wall of the other side of the pit (1); The support rod (22) is rotatably connected at its end to support one (21) or support two (210), and a support wheel (23) is fixed on the support rod (22); The support belt (24) is wrapped around the surface of the support wheel (23). The outer surface of the support wheel (23) and the inner surface of the support belt (24) are provided with concave teeth (25), and the concave teeth (25) on the outer surface of the support wheel (23) and the concave teeth (25) on the inner surface of the support belt (24) are engaged and connected.

3. The roadbed widening construction pit support structure according to claim 2, characterized in that, The driving structure (3) includes: The outer support (31) is fixed to the side of the second support (210); The inner support (32) is fixed to the side of the support (21), and the end of the inner support (32) is slidably connected to the inside of the outer support (31); The first type of bracket (33) is fixed on the outer support (31) and has an outer rod (331) rotatably connected inside; The second bracket (35) is fixed on the upper side of the inner bracket (32), and an inner rod (36) is rotatably connected inside. The inner rod (36) is slidably connected to the inside of the outer rod (331) through a spline shaft and a spline cylinder. A bevel gear (37) is installed at the ends of the outer rod (331), the inner rod (36) and the support rod (22). The bevel gear (37) at the end of the outer rod (331) is meshed with the bevel gear (37) at the end of a set of support rods (22), and the bevel gear (37) at the end of the inner rod (36) is meshed with the bevel gear (37) at the end of another set of support rods (22). Rack 1 (341) is slidably connected to the surface of the outer bracket (31), and a pull ring (342) is fixed at its end; Ratchet 1 (344) is fixed to the surface of the outer rod (331); Gear 1 (343) is rotatably connected to the surface of ratchet 1 (344), and gear 1 (343) is meshed with rack 1 (341); A pawl groove (345) is formed on the inner wall of gear one (343). Pawl one (346) is slidably connected in the pawl groove (345). The end of pawl one (346) is engaged in the interior of ratchet one (344). A compression spring is installed in the pawl groove (345) near the interior of pawl one (346).

4. The roadbed widening construction pit support structure according to claim 3, characterized in that, The width adjustment structure (4) includes: The fixing bracket (41) is fixed to the inside of the second support (210); The sliding frame (42) is fixed to the inner side of the support (21), and the end of the sliding frame (42) is slidably connected to the inside of the fixed frame (41); The extension seat (43) is fixed on the second support (210), and the extension seat (43) is connected to the sliding frame (42) by a multi-link (44); The slider (45) is slidably connected to the surface of the sliding frame (42). One end is connected to the inner side of the support (21) via a cylinder (47), and the other end is rotatably connected to the multi-link (44) via a rotating shaft (46).

5. The roadbed widening construction pit support structure according to claim 2, characterized in that, The end of the support structure (2) is equipped with a locking structure (5), which is used to lock the moving position of the support structure (2).

6. The roadbed widening construction pit support structure according to claim 5, characterized in that, The locking structure (5) includes: Ratchet 2 (51) is fixed to the end of the support rod (22); The pawl shaft (52) is rotatably connected to support one (21) or support two (210); Pawl 2 (53) is mounted on pawl shaft (52), and the end of pawl 2 (53) is engaged with ratchet 2 (51); The support (54) is fixed to support one (21) or support two (210), and the support (54) is connected to the outside of pawl two (53) by spring (55).

7. The roadbed widening construction pit support structure according to claim 1, characterized in that, The step detection caliper (6) includes: The testing platform (61) is located inside the pit (1), and a sliding component (62) is slidably connected inside. The sliding component (62) is connected to the upper inner wall of the testing platform (61) through an electric telescopic rod (621). Rotating pin (63) is rotatably connected to sliding member (62), and gear two (64) is fixed on its surface; Guide rails (65) are connected to the outer surface of the testing table (61), and lifting blocks (66) are slidably connected to the surfaces of the two sets of guide rails (65). Rack 2 (661) is provided on the side of the lifting block (66), and both sets of rack 2 (661) are meshed with gear 2 (64); The caliper (67) is detachably connected to two sets of lifting blocks (66); A dial (69) is formed on the outer surface of gear two (64); An indicator (68) is provided on the slider (62) and is located outside the dial (69).

8. The roadbed widening construction pit support structure according to claim 7, characterized in that, The slider (62) is made of transparent material.

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