Inner support connecting device for deep foundation pit supporting system

Abstract

The invention relates to the technical field of foundation pit supporting, in particular to an inner supporting connecting device for a deep foundation pit supporting system, which comprises a connector pipe, a supporting assembly is movably mounted in the connector pipe, the supporting assembly comprises a push head, a belt wheel I and a driving shaft, the push head is inserted into the side wall of the connector pipe in a sliding manner, and the belt wheel I is arranged on the side wall of the connector pipe. And the driving shaft is movably inserted into the connector pipe. Through cooperation between the locking assembly and the clamping assembly, after the inner supporting structures are connected through bolts, the inner supporting structures are always squeezed mutually, welding between all sections of structures is not needed, the tightness between the inner supporting structures and the assembling efficiency are improved, meanwhile, after using is completed, operation such as cutting is not needed for the inner supporting structures, and the assembling efficiency is improved. The inner supporting structures can still continue to be used, the cost of the deep foundation pit supporting system is reduced, and it is ensured that force borne by all the inner supporting structures is the same in the deep foundation pit supporting process through switching of locking and unlocking of the outer pushing plate on the pushing head.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to an internal support connection device for deep foundation pit support systems. Background Technology

[0002] In early construction projects, the scale was relatively small and the foundation pits were shallow, so the requirements for the support system were not high. Simple slope excavation or simple support methods such as wooden piles could meet the project needs. However, with the acceleration of urbanization, deep foundation pit construction in urban centers is often limited by site constraints, making it impossible to use steep slope excavation. At the same time, the impact on surrounding buildings and underground pipelines must be considered. This necessitates more effective foundation pit support technology. Existing deep foundation pit support internal support structures typically use steel supports. Before construction, the steel support structure is fixed with bolts and then welded together. After assembly, it is installed using specialized hoisting equipment. During installation, prestress is applied to the steel supports, and inspection is performed. After confirming no abnormalities, the steel support structure was fixed by welding. However, during assembly, welding was still required after bolting, which not only prevented the complete recycling of the steel support structure but also increased costs and reduced assembly efficiency. Furthermore, the need for welding during fixing meant that the steel support structure needed to be cut during dismantling, resulting in low dismantling efficiency and further increasing costs. In addition, the steel support required multiple manual inspections during the internal support process to ensure that it was always in contact with the walers. However, when the steel support and walers were not in contact, timely adjustments could not be made, making manual inspection inefficient and failing to ensure the stability and safety of the internal support structure. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art by proposing an internal support connection device for deep foundation pit support systems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An internal support connection device for a deep foundation pit support system includes a connecting head tube. A support assembly is movably installed inside the connecting head tube. The support assembly includes a pusher, a pulley, and a drive shaft. The pusher is slidably inserted into the side wall of the connecting head tube. The drive shaft is movably inserted into the inside of the connecting head tube. A support plate is integrally formed inside the connecting head tube. The pulley is movably installed at the bottom of the support plate. The drive shaft is movably inserted into the inside of the pulley and is threadedly engaged. A locking assembly is movably mounted above the support plate. The locking assembly includes a rack and a gear. The gear is slidably mounted on the outside of the drive shaft, and the rack is fixedly mounted on the side wall of the push head. The gear and the rack mesh with each other. A clamping assembly is movably mounted on the side wall of the pusher. The clamping assembly includes a sliding frame, a rotating cylinder, and a rotating ring. The sliding frame is slidably mounted above the support plate. The rotating cylinder is rotatably mounted above the sliding frame. The rotating cylinder is movably fitted onto the outside of the drive shaft and is threadedly engaged. The rotating ring is rotatably mounted on the top of the gear and slidably mounted below the sliding frame. A drive assembly is movably mounted on the outer side of the pulley, the drive assembly being located at the bottom of the support plate, and the drive assembly being used to control the extension and retraction of the push head.

[0005] In the aforementioned internal support connection device for a deep foundation pit support system, a connecting block is rotatably mounted on the side wall of the drive shaft, and support rods are rotatably mounted on both sides of the connecting block. One of the support rods is rotatably connected to the side wall of the push head near the connecting head tube, and the other support rod is rotatably connected to the side wall of the connecting head tube. The inner push plate is fixedly installed inside the connecting head tube.

[0006] In the aforementioned internal support connection device for a deep foundation pit support system, the side wall of the drive shaft is provided with a second sliding groove, the inside of the gear is integrally formed with a slide bar, the slide bar is slidably installed inside the second sliding groove, and the side wall of the rack is rotatably installed with a roller, the roller abutting against the inner wall of the connecting head tube.

[0007] In the aforementioned internal support connection device for a deep foundation pit support system, an outer push plate is slidably inserted into the side wall of the push head, and a sliding rod three is integrally formed on the side wall of the outer push plate. A sliding groove one is opened inside the push head, and the sliding rod three is slidably installed inside the sliding groove one. An air pressure chamber and a movable chamber are opened inside the push head. A piston two and a sliding plate are fixedly connected to the side wall of the outer push plate, and the piston two and the sliding plate are slidably installed inside the air pressure chamber and the movable chamber, respectively.

[0008] In the aforementioned internal support connection device for a deep foundation pit support system, the top of the support plate is integrally formed with a second side plate, a second spring is provided between the second side plate and the sliding plate, the top of the sliding frame is integrally formed with a sealing cylinder, an air pipe is provided between the air pressure chamber and the sealing cylinder, and the top of the rotating ring is integrally formed with a first piston, which is slidably installed inside the sealing cylinder.

[0009] In the aforementioned internal support connection device for a deep foundation pit support system, the top of the rotating ring is provided with a sliding groove three, a sliding plate is slidably installed inside the sliding groove three, the sliding plate passes through the top of the sliding frame, the side wall of the sliding plate is integrally formed with a sliding ball, the outer side of the rotating cylinder is provided with a spiral sliding groove, and the sliding ball is slidably installed inside the spiral sliding groove.

[0010] In the aforementioned internal support connection device for a deep foundation pit support system, the top of the sliding frame has two side plates three integrally formed, the sliding plate is slidably installed between the two side plates three, the side wall of the side plate three is provided with a U-shaped sliding groove, the side wall of the sliding plate is integrally formed with a sliding rod two, and the sliding rod two is slidably installed inside the U-shaped sliding groove.

[0011] In the aforementioned internal support connection device for a deep foundation pit support system, the drive assembly includes a second pulley, a synchronous toothed belt, and two third pulleys. The second pulley is rotatably mounted on the bottom of the support plate, and a coupling is fixedly mounted on the bottom of the second pulley. A sliding rod is rotatably mounted inside each of the two third pulleys, and the sliding rod is slidably mounted on the side wall of the support plate. The synchronous toothed belt is movably fitted onto the outside of the first pulley, the second pulley, and the two third pulleys. A side plate is integrally formed at the bottom of the connecting head tube, and a spring is provided between the sliding rod and the side plate.

[0012] Compared with existing technologies, the advantages of this invention are: The locking and clamping components, which are movable above the support plate, ensure that the internal support structures remain mutually compressed after being bolted together, eliminating the need for welding between each section. This improves the tightness between the internal support structures and the efficiency of assembly. Furthermore, after use, there is no need for cutting or other operations on the internal support structures, allowing them to remain usable and reducing the cost of the deep foundation pit support system. When the pusher head contacts the waler, the locking and unlocking of the pusher head, controlled by the outer push plate, ensures that each internal support structure bears the same force during deep foundation pit support. To avoid the impact of varying forces on the internal supports on the effectiveness of the foundation pit support, when the deep foundation pit sidewall drives the waler to squeeze the pusher head, the meshing of the rack and gears locks the pusher head, improving the support effect of the pusher head and waler and preventing the pusher head from shrinking inward. When the deep foundation pit sidewall drives the waler to move outward, the outer push plate detects the gap between the pusher head and the waler. When a gap exists between the pusher head and the waler, the drive shaft can promptly drive the pusher head to move towards the waler and engage with it, reducing the number of times and frequency of maintenance required by workers on the internal support structure, while improving the stability and safety during the internal support process. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the pusher head in this invention; Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the internal structure of the connecting head tube in this invention; Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle; Figure 8 This is a disassembly diagram of the outer component of the drive shaft in this invention; Figure 9 This is a disassembly diagram of the clamping component in this invention; Figure 10 This is a schematic diagram of the pusher head in this invention; Figure 11 This is a schematic diagram of the structure of the push plate in this invention; Figure 12 This is a schematic diagram of the connecting head tube in this invention; Figure 13 This is a schematic diagram of the driving component in this invention.

[0014] In the diagram: 1. Connecting head tube; 11. Support plate; 12. Push head; 121. Slide groove one; 122. Air pipe; 123. Rack; 124. Roller; 125. Air chamber; 126. Movable chamber; 13. Pulley one; 131. Side plate one; 132. Pulley two; 133. Coupling; 134. Slide rod one; 135. Synchronous toothed belt; 136. Spring one; 137. Pulley three; 14. Side plate two; 21. Drive shaft; 211. Support rod; 212. Connecting head. 213. Inner push plate; 214. Slide groove two; 22. Sliding frame; 221. Side plate three; 222. Slide plate; 223. U-shaped slide groove; 224. Rotary cylinder; 225. Spiral slide groove; 226. Sliding ball; 227. Sealing cylinder; 228. Slide rod two; 23. Gear; 231. Rotary ring; 232. Piston one; 233. Slide groove three; 234. Sliding bar; 31. Outer push plate; 311. Slide rod three; 312. Piston two; 313. Slide plate; 314. Spring two. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0017] Reference Figure 1 - Figure 13 As shown, an internal support connection device for a deep foundation pit support system includes a connecting head pipe 1. A support assembly is movably installed inside the connecting head pipe 1. The support assembly includes a pusher 12, a pulley 13, and a drive shaft 21. The pusher 12 is slidably inserted into the side wall of the connecting head pipe 1, and the drive shaft 21 is movably inserted into the inside of the connecting head pipe 1. A support plate 11 is integrally formed inside the connecting head pipe 1. The pulley 13 is movably installed at the bottom of the support plate 11, and the drive shaft 21 is movably inserted into the inside of the pulley 13 and is threadedly engaged. A locking assembly is movably installed above the support plate 11. The locking assembly includes a rack 123 and a gear 23. The gear 23 is slidably installed on the outside of the drive shaft 21, and the rack 123 is fixedly installed on the side wall of the push head 12. The gear 23 and the rack 123 mesh with each other. A clamping assembly is movably mounted on the side wall of the pusher 12. The clamping assembly includes a sliding frame 22, a rotating cylinder 224, and a rotating ring 231. The sliding frame 22 is slidably mounted on the top of the support plate 11. The rotating cylinder 224 is rotatably mounted on the top of the sliding frame 22. The rotating cylinder 224 is movably fitted onto the outside of the drive shaft 21 and is threadedly engaged. The rotating ring 231 is rotatably mounted on the top of the gear 23 and slidably mounted below the sliding frame 22. A drive assembly is movably mounted on the outer side of pulley 13. The drive assembly is located at the bottom of support plate 11 and is used to control the extension and retraction of push head 12.

[0018] like Figure 1 , Figure 2 , Figure 6 and Figure 10 As shown, a connecting block 212 is rotatably mounted on the side wall of the drive shaft 21. Support rods 211 are rotatably mounted on both sides of the connecting block 212. One of the support rods 211 is rotatably connected to the side wall of the push head 12 near the connecting head tube 1. The other support rod 211 is rotatably connected to the side wall of the inner push plate 213. The inner push plate 213 is fixedly installed inside the connecting head tube 1.

[0019] like Figure 3 , Figure 8 and Figure 13As shown, the drive assembly includes pulley 2 132, synchronous toothed belt 135, and two pulleys 3 137. Pulley 2 132 is rotatably mounted on the bottom of support plate 11. A coupling 133 is fixedly mounted on the bottom of pulley 2 132. Slide rod 134 is rotatably mounted inside each of the two pulleys 3 137. Slide rod 134 is slidably mounted on the side wall of support plate 11. Synchronous toothed belt 135 is movably fitted on the outside of pulley 1 13, pulley 2 132, and the two pulleys 3 137. A side plate 131 is integrally formed at the bottom of the connecting head tube 1. A spring 136 is provided between slide rod 134 and side plate 131.

[0020] When the connecting head tube 1 and the push head 12 are located on the side wall of the waler, the worker fixes the output shaft of the external motor and the coupling 133 and starts the external motor. At this time, the pulley 22 drives the pulley 13 to rotate through the synchronous toothed belt 135, so that the drive shaft 21 moves downward through the drive of the pulley 13. During the downward movement of the drive shaft 21, the two support rods 211 rotate downward and extend, so that the drive shaft 21 and the push head 12 move closer to the waler. When the push head 12 touches the waler, the external motor can be removed.

[0021] like Figure 7 , Figure 8 and Figure 10 As shown, the drive shaft 21 has a second groove 214 on its side wall, and the gear 23 has an integrally formed slide bar 234 inside. The slide bar 234 is slidably installed inside the second groove 214. The rack 123 has a roller 124 rotatably installed on its side wall, and the roller 124 abuts against the inner wall of the connecting head tube 1.

[0022] In this process, after the pusher head 12 contacts the waler, the gear 23 and the rack 123 mesh. When the sidewall of the deep foundation pit pushes the pusher head 12 by driving the waler, the pusher head 12 drives the gear 23 to rotate through the rack 123. The gear 23 drives the drive shaft 21 to rotate. At this time, the pulley 13 is fixed to the bottom of the support plate 11, causing the drive shaft 21 to move downward. The two support rods 211 continue to push the pusher head 12 to press against the waler. Through the meshing of the rack 123 and the gear 23, the pusher head 12 is locked, improving the support effect of the pusher head 12 against the waler and preventing the pusher head 12 from shrinking inward.

[0023] like Figure 2 , Figure 5 , Figure 10 and Figure 11As shown, an outer push plate 31 is slidably inserted into the side wall of the push head 12. A slide rod 311 is integrally formed on the side wall of the outer push plate 31. A slide groove 121 is opened inside the push head 12. The slide rod 311 is slidably installed inside the slide groove 121. A pressure chamber 125 and a movable chamber 126 are opened inside the push head 12. A piston 2 312 and a slide plate 313 are fixedly connected to the side wall of the outer push plate 31. The piston 2 312 and the slide plate 313 are slidably installed inside the pressure chamber 125 and the movable chamber 126, respectively.

[0024] like Figures 3-10 As shown, the top of the support plate 11 is integrally formed with a side plate 2 14, and a spring 2 314 is provided between the side plate 2 14 and the slide plate 313. The top of the sliding frame 22 is integrally formed with a sealing cylinder 227, and an air pipe 122 is provided between the air pressure chamber 125 and the sealing cylinder 227. The top of the rotating ring 231 is integrally formed with a piston 1 232, and the piston 1 232 is slidably installed inside the sealing cylinder 227.

[0025] Before the pusher head 12 contacts the waler, the outer push plate 31 moves away from the side wall of the pusher head 12 by the contact of the second spring 314, causing the second piston 312 to pull the first piston 232 upward through the air chamber 125 and the air pipe 122. The rotating ring 231 drives the gear 23 to move upward with the first piston 232, causing the gear 23 and the rack 123 to separate, and the pusher head 12 is unlocked. At this time, the pusher head 12 moves towards the waler by the drive of the external motor and the drive shaft 21. After the push head 12 contacts the waler, the outer push plate 31 contacts the side wall of the push head 12. At this time, the piston 212 drives the rotating ring 231 and the gear 23 to move downward through the piston 1 232, so that the gear 23 and the rack 123 mesh, and the push head 12 is locked. The switching of locking and unlocking of the push head 12 by the outer push plate 31 ensures that each internal support structure bears the same force during the deep foundation pit support process, and avoids the effect of foundation pit support being affected by different forces borne by the internal supports.

[0026] Further reference Figure 5 and Figure 6 As explained, a branch pipe (not shown in the figure) extends outward from the side wall of the trachea 122. When it is necessary to disassemble the internal support structure, the branch pipe is fixedly connected to the external air pump. The external air pump draws air from the inside of the trachea 122, causing the piston 232 to drive the rotating ring 231 and gear 23 to move upward and unlock the pusher head 12. At this time, the drive shaft 21 reverses through the drive of the external motor and pulley 13, and drives the pusher head 12 to retract.

[0027] like Figure 3 and Figures 7-9As shown, the top of the rotating ring 231 is provided with a sliding groove 233, and a sliding plate 222 is slidably installed inside the sliding groove 233. The sliding plate 222 passes through the top of the sliding frame 22. The side wall of the sliding plate 222 is integrally formed with a sliding ball 226. The outer side of the rotating cylinder 224 is provided with a spiral groove 225, and the sliding ball 226 is slidably installed inside the spiral groove 225. The top of the sliding frame 22 is integrally formed with two side plates 221, and the sliding plate 222 is slidably installed between the two side plates 221. The side wall of the side plate 221 is provided with a loop-shaped sliding groove 223, and the side wall of the sliding plate 222 is integrally formed with a sliding rod 228, which is slidably installed inside the loop-shaped sliding groove 223.

[0028] During the process of the pusher head 12 contacting the waler, the outer push plate 31 and the waler remain in contact. When the sidewall of the deep foundation pit moves the waler outward, the outer push plate 31 moves along with the waler, causing the piston 212 to drive the rotating ring 231 upward through the piston 1 232. At this time, the pusher head 12 is in an unlocked state. During the upward movement of the rotating ring 231, the sliding plate 222 moves upward along with the rotating ring 231, causing the sliding plate 222 to drive the rotating ring 231 upward through the ball bearing 226 and the spiral groove 225. The cylinder 224 rotates, and the drive shaft 21 moves downward through the rotation of the cylinder 224, causing the push head 12 to move towards the waler and abut against the waler. The outer push plate 31 detects the gap between the push head 12 and the waler, so that when there is a gap between the push head 12 and the waler, the drive shaft 21 can promptly drive the push head 12 to move towards the waler and abut against the waler, reducing the number of times and frequency of maintenance by workers on the internal support structure, while improving the stability and safety during the internal support process.

[0029] The working principle and usage of this invention are explained in detail below: Before the push head 12 contacts the waler, the outer push plate 31 moves away from the side wall of the push head 12 through the contact of the second spring 314, causing the second piston 312 to pull the first piston 232 upward through the air chamber 125 and the air pipe 122. The rotating ring 231 drives the gear 23 to move upward with the first piston 232, causing the gear 23 and the rack 123 to separate, and the push head 12 is unlocked. At this time, the worker drives the pulley 13 to rotate through the external motor, causing the drive shaft 21 to move downward through the drive of the pulley 13. During the downward movement of the drive shaft 21, the two support rods 211 rotate downward and extend, causing the drive shaft 21 and the push head 12 to move closer to the waler. When the push head 12... After contact with the waler, the outer push plate 31 and the side wall of the push head 12 come into contact. The worker removes the external motor. At this time, piston 2 312 drives the rotating ring 231 and gear 23 to move downward through piston 1 232, so that gear 23 and rack 123 mesh, and push head 12 is locked. The outer push plate 31 switches between locking and unlocking push head 12 to ensure that each internal support structure bears the same force during the deep foundation pit support process, so as to avoid the different forces borne by the internal supports affecting the foundation pit support effect. When the deep foundation pit side wall drives the waler to squeeze the push head 12, push head 12 drives gear 23 to rotate through rack 123. Gear 23 drives drive shaft 21 to rotate. At this time, pulley 13 is fixed to the bottom of support plate 11, so that drive shaft 21 moves downward and the two supports Rod 211 continues to push push head 12 against the waler. Through the meshing of rack 123 and gear 23, push head 12 is locked, improving its support effect on the waler and preventing it from retracting inwards. During the process of push head 12 contacting the waler, when the deep pit sidewall moves the waler outwards, the outer push plate 31 moves along with the waler, causing piston 212 to drive rotating ring 231 upwards via piston 1 232. At this time, push head 12 is unlocked. During the upward movement of rotating ring 231, sliding plate 222 moves upwards along with rotating ring 231, causing sliding plate 222 to drive rotating cylinder 224 to rotate. Drive shaft 21 moves downwards through the rotation of rotating cylinder 224, causing push head 12 to move towards the waler and contact it. The purlin, through the detection of the gap between the push head 12 and the purlin by the outer push plate 31, allows the drive shaft 21 to promptly drive the push head 12 to move towards the purlin and abut against it when a gap exists between the push head 12 and the purlin. This reduces the number of times and frequency of maintenance by workers on the internal support structure, while improving the stability and safety during the internal support process. Through the cooperation between the locking component and the clamping component, the internal support structure is always pressed against each other after being connected by bolts, eliminating the need for welding between each section of the structure. This improves the tightness between the internal support structures and the efficiency of the internal support structure assembly. Furthermore, after use, there is no need for cutting or other operations on the internal support structure, allowing it to continue to be used, thus reducing the cost of the deep foundation pit support system.

[0030] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An internal support connection device for a deep foundation pit support system, comprising a connecting head pipe (1), characterized in that: The connecting tube (1) is movably fitted with a support assembly, which includes a pusher (12), a pulley (13) and a drive shaft (21). The pusher (12) is slidably inserted into the side wall of the connecting tube (1), and the drive shaft (21) is movably inserted into the inside of the connecting tube (1). The connecting tube (1) is integrally formed with a support plate (11). The pulley (13) is movably installed at the bottom of the support plate (11), and the drive shaft (21) is movably inserted into the inside of the pulley (13) and is threadedly engaged. A locking assembly is movably installed above the support plate (11). The locking assembly includes a rack (123) and a gear (23). The gear (23) is slidably installed on the outside of the drive shaft (21). The rack (123) is fixedly installed on the side wall of the push head (12). The gear (23) and the rack (123) mesh with each other. The side wall of the pusher (12) is movably mounted with a clamping assembly, which includes a sliding frame (22), a rotating cylinder (224), and a rotating ring (231). The sliding frame (22) is slidably mounted above the support plate (11), and the rotating cylinder (224) is rotatably mounted above the sliding frame (22). The rotating cylinder (224) is movably fitted onto the outside of the drive shaft (21) and is threadedly engaged. The rotating ring (231) is rotatably mounted on the top of the gear (23), and the rotating ring (231) is slidably mounted below the sliding frame (22). A drive assembly is movably mounted on the outer side of the pulley (13), the drive assembly being located at the bottom of the support plate (11), the drive assembly being used to control the extension and retraction of the push head (12).

2. The internal support connection device for a deep foundation pit support system according to claim 1, characterized in that: A connecting block (212) is rotatably mounted on the side wall of the drive shaft (21). Support rods (211) are rotatably mounted on both sides of the connecting block (212). One of the support rods (211) is rotatably connected to the side wall of the push head (12) near the connecting head tube (1). The other support rod (211) is rotatably connected to the side wall of the inner push plate (213). The inner push plate (213) is fixedly installed inside the connecting head tube (1).

3. The internal support connection device for a deep foundation pit support system according to claim 1, characterized in that: The drive shaft (21) has a second sliding groove (214) on its side wall. The gear (23) has an integrally formed sliding strip (234) inside. The sliding strip (234) is slidably installed inside the second sliding groove (214). The rack (123) has a roller (124) rotatably installed on its side wall. The roller (124) abuts against the inner wall of the connecting head tube (1).

4. The internal support connection device for a deep foundation pit support system according to claim 1, characterized in that: The pusher (12) has an outer push plate (31) slidably inserted into its side wall. The side wall of the outer push plate (31) is integrally formed with a slide rod three (311). The pusher (12) has a slide groove one (121) inside. The slide rod three (311) is slidably installed inside the slide groove one (121). The pusher (12) has a pressure chamber (125) and a movable chamber (126) inside. The side wall of the outer push plate (31) is fixedly connected with a piston two (312) and a slide plate (313). The piston two (312) and the slide plate (313) are slidably installed inside the pressure chamber (125) and the movable chamber (126), respectively.

5. The internal support connection device for a deep foundation pit support system according to claim 4, characterized in that: The top of the support plate (11) is integrally formed with a side plate two (14), and a spring two (314) is provided between the side plate two (14) and the slide plate (313). The top of the sliding frame (22) is integrally formed with a sealing cylinder (227), and an air pipe (122) is provided between the air pressure chamber (125) and the sealing cylinder (227). The top of the rotating ring (231) is integrally formed with a piston one (232), and the piston one (232) is slidably installed inside the sealing cylinder (227).

6. The internal support connection device for a deep foundation pit support system according to claim 1, characterized in that: The top of the rotating ring (231) is provided with a sliding groove three (233), and a sliding plate (222) is slidably installed inside the sliding groove three (233). The sliding plate (222) passes through the top of the sliding frame (22), and a sliding ball (226) is integrally formed on the side wall of the sliding plate (222). A spiral groove (225) is provided on the outer side of the rotating cylinder (224), and the sliding ball (226) is slidably installed inside the spiral groove (225).

7. The internal support connection device for a deep foundation pit support system according to claim 6, characterized in that: The top of the sliding frame (22) has two side plates (221) integrally formed. The sliding plate (222) is slidably installed between the two side plates (221). The side wall of the side plate (221) is provided with a spiral groove (223). The side wall of the sliding plate (222) is integrally formed with a sliding rod (228). The sliding rod (228) is slidably installed inside the spiral groove (223).

8. The internal support connection device for a deep foundation pit support system according to claim 1, characterized in that: The drive assembly includes a second pulley (132), a synchronous toothed belt (135), and two third pulleys (137). The second pulley (132) is rotatably mounted on the bottom of the support plate (11). A coupling (133) is fixedly mounted on the bottom of the second pulley (132). A slide rod (134) is rotatably mounted inside each of the two third pulleys (137). The slide rod (134) is slidably mounted on the side wall of the support plate (11). The synchronous toothed belt (135) is movably fitted on the outside of the first pulley (13), the second pulley (132), and the two third pulleys (137). A side plate (131) is integrally formed at the bottom of the connecting head tube (1). A spring (136) is provided between the slide rod (134) and the side plate (131).

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