An inner support connecting device for a deep foundation pit support system

Abstract

The application relates to the technical field of foundation pit support, in particular to an inner support connecting device for a deep foundation pit support system, which comprises a connecting head pipe, a support assembly movably mounted in the inner part of the connecting head pipe, the support assembly comprising a push head, a belt wheel one and a driving shaft, the push head being slidably inserted into the side wall of the connecting head pipe, and the driving shaft being movably inserted into the inner part of the connecting head pipe. Through cooperation between the locking assembly and the tightening assembly, after the inner support structure is connected through bolts, the inner support structures are always extruded to each other, welding between each structure is not needed, the compactness between the inner support structures and the efficiency during assembly are improved, after use, the inner support structure does not need to be cut and the like, the inner support structure can still be continuously used, the cost of the deep foundation pit support system is reduced, and through switching of the push head locking and unlocking of the outer push plate, the force borne by each inner support structure during deep foundation pit support is ensured to be the same.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, in particular to an inner support connecting device for deep foundation pit support system. BACKGROUND

[0002] In the early construction project, the scale is relatively small, the depth of foundation pit is shallow, and the requirement for support system is not high. Simple slope excavation or simple support method such as wood pile can meet the engineering demand. However, with the acceleration of urbanization process, when deep foundation pit construction is carried out in the urban center area, it is often limited by site and cannot use large slope for slope excavation. At the same time, the influence on surrounding buildings, underground pipelines and other factors needs to be considered. Therefore, more effective foundation pit support technology is needed. The existing inner support structure of deep foundation pit support usually adopts steel support. The steel support structure is fixed by bolt before welding and assembly. After assembly, it is installed by special hoisting equipment. During installation, prestress is applied to the steel support. After checking that there is no abnormality, it is fixed by welding. However, during assembly, welding is still needed after bolt fixation. This not only makes the steel support structure unable to be completely recycled, but also increases the cost and reduces the assembly efficiency. In addition, during the fixation, the steel support still needs to be fixed by welding. When the steel support is removed, it needs to be cut. This not only leads to low disassembly efficiency, but also further increases the cost. In addition, during the inner support process, the steel support needs to be checked by workers many times to ensure that the steel support always interferes with the surrounding purlin. However, when the steel support does not interfere with the surrounding purlin, it cannot be adjusted in time. This makes the manual inspection efficiency not high and cannot ensure the stability and safety of the inner support structure. SUMMARY

[0003] The purpose of the present application is to solve the problems in the background art and provide an inner support connecting device for deep foundation pit support system.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] An inner support connecting device for deep foundation pit support system, comprising a connecting head pipe, a support assembly movably mounted in the connecting head pipe, the support assembly comprising a push head, a belt pulley one and a driving shaft, the push head being slidably inserted into the side wall of the connecting head pipe, the driving shaft being movably inserted into the connecting head pipe, a support plate being integrally formed in the connecting head pipe, the belt pulley one being movably mounted at the bottom of the support plate, the driving shaft being movably inserted into the belt pulley one and being in threaded cooperation;

[0006] A locking assembly is movably mounted above the support plate, the locking assembly comprising a rack and a gear, the gear being slidably mounted on the outside of the driving shaft, the rack being fixedly mounted on the side wall of the push head, the gear and the rack being in engagement.

[0007] The side wall of the push head is movably provided with a tightening assembly, the tightening assembly comprises a sliding frame, a rotating drum and a rotating ring, the sliding frame is movably arranged above the support plate, the rotating drum is rotatably arranged above the sliding frame, the rotating drum is movably sleeved outside the driving shaft and is in threaded connection, and the rotating ring is rotatably arranged on the top of the gear and is movably arranged below the sliding frame.

[0008] The outer side of the pulley one is movably provided with a driving assembly, the driving assembly is located at the bottom of the support plate, and the driving assembly is used for controlling the extension and contraction of the push head.

[0009] In the inner support connecting device for the deep foundation pit support system, the side wall of the driving shaft is rotatably provided with a connecting block, both sides of the connecting block are rotatably provided with support rods, one of the support rods is rotatably connected with the side wall of the push head close to the side of the connecting head pipe one, and the side wall of the other support rod is rotatably connected with an inner push plate, and the inner push plate is fixedly arranged in the inner part of the connecting head pipe.

[0010] In the inner support connecting device for the deep foundation pit support system, the side wall of the driving shaft is provided with a sliding groove two, the inner part of the gear is integrally formed with a sliding strip, the sliding strip is movably arranged in the inner part of the sliding groove two, the side wall of the gear is rotatably provided with a roller, and the roller is in abutment with the inner wall of the connecting head pipe.

[0011] In the inner support connecting device for the deep foundation pit support system, the side wall of the push head is movably inserted with an outer push plate, the side wall of the outer push plate is integrally formed with a sliding rod three, the inner part of the push head is provided with a sliding groove one, the sliding rod three is movably arranged in the inner part of the sliding groove one, the inner part of the push head is provided with a gas pressure chamber and a movable chamber, the side wall of the outer push plate is fixedly connected with a piston two and a sliding disc, and the piston two and the sliding disc are movably arranged in the inner part of the gas pressure chamber and the movable chamber respectively.

[0012] In the inner support connecting device for the deep foundation pit support system, the top of the support plate is integrally formed with a side plate two, a spring two is arranged between the side plate two and the sliding disc, the top of the sliding frame is integrally formed with a sealing cylinder, a gas pipe is arranged between the gas pressure chamber and the sealing cylinder, the top of the rotating ring is integrally formed with a piston one, and the piston one is movably arranged in the inner part of the sealing cylinder.

[0013] In the inner support connecting device for the deep foundation pit support system, the top of the rotating ring is provided with a sliding groove three, a sliding plate is movably arranged in the inner part of the sliding groove three, the sliding plate penetrates the top of the sliding frame, the side wall of the sliding plate is integrally formed with a sliding bead, and the outer side of the rotating drum is provided with a spiral sliding groove, and the sliding bead is movably arranged in the inner part of the spiral sliding groove.

[0014] In the internal support connecting device for deep foundation pit support system, the top of the sliding frame is integrally formed with two side plates three, the sliding plate is slidingly installed between the two side plates three, the side wall of the side plate three is provided with a back-shaped sliding groove, the side wall of the sliding plate is integrally formed with a sliding rod two, and the sliding rod two is slidingly installed in the back-shaped sliding groove.

[0015] In the internal support connecting device for deep foundation pit support system, the driving assembly comprises a belt wheel two, a synchronous toothed belt and two belt wheels three, the belt wheel two is rotationally installed at the bottom of the support plate, the bottom of the belt wheel two is fixedly installed with a shaft coupling, the sliding rod one is rotationally installed in the inside of the two belt wheels three, the sliding rod one is slidingly installed on the side wall of the support plate, the synchronous toothed belt is movably sleeved on the outside of the belt wheel one, the belt wheel two and the two belt wheels three, the bottom of the connecting head pipe is integrally formed with a side plate one, and the spring one is arranged between the sliding rod one and the side plate one.

[0016] Compared with the prior art, the internal support connecting device for deep foundation pit support system has the following advantages:

[0017] The locking assembly and the tightening assembly movably installed above the support plate make the internal support structures always extrude each other after being connected by bolts, so that welding work between each structure is not needed, the tightness between the internal support structures is improved, the efficiency of assembling the internal support structures is improved, the internal support structures can still be used after use without cutting operation, the cost of the deep foundation pit support system is reduced, the force borne by each internal support structure is ensured to be the same during the deep foundation pit support process through the switching of the locking and unlocking of the push head by the outer push plate when the push head abuts against the surrounding purlin, the effect of the foundation pit support is avoided to be affected by the different forces borne by the internal supports, the push head is locked through the meshing of the rack and the gear when the side wall of the deep foundation pit extrudes the surrounding purlin to push the push head, the support effect of the push head surrounding purlin is improved, and the problem of the push head shrinking inward is avoided, the gap between the push head and the surrounding purlin is detected by the outer push plate when the side wall of the deep foundation pit moves outward to move the push head to the surrounding purlin and abut against the surrounding purlin in time when the gap exists between the push head and the surrounding purlin, the number and frequency of maintenance of the internal support structure by workers are reduced, and the stability and safety during the internal support process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure schematic view of the present application;

[0019] Figure 2 It is a whole structure sectional view of the present application;

[0020] Figure 3 It is an enlarged schematic view of A in the present application; Figure 2 ​

[0021] Figure 4 is a sectional view of the push head in the present application;

[0022] Figure 5 is an enlarged view of B in the present application Figure 4

[0023] Figure 6 is a structural schematic view of the inside of the connector tube in the present application;

[0024] Figure 7 is an enlarged view of C in the present application Figure 6

[0025] Figure 8 is a disassembled schematic view of the outside part of the drive shaft in the present application;

[0026] Figure 9 is a disassembled schematic view of the tightening assembly in the present application;

[0027] Figure 10 is a structural schematic view of the push head in the present application;

[0028] Figure 11 is a structural schematic view of the outer push plate in the present application;

[0029] Figure 12 is a structural schematic view of the connector tube in the present application;

[0030] Figure 13 is a structural schematic view of the drive assembly in the present application.

[0031] In the figure: 1, connector tube; 11, support plate; 12, push head; 121, sliding groove one; 122, air pipe; 123, rack; 124, roller; 125, air pressure chamber; 126, movable chamber; 13, pulley one; 131, side plate one; 132, pulley two; 133, coupling; 134, sliding rod one; 135, synchronous toothed belt; 136, spring one; 137, pulley three; 14, side plate two; 21, drive shaft; 211, support rod; 212, connecting block; 213, inner push disc; 214, sliding groove two; 22, sliding frame; 221, side plate three; 222, sliding plate; 223, back-shaped sliding groove; 224, rotating cylinder; 225, spiral sliding groove; 226, sliding bead; 227, sealing cylinder; 228, sliding rod two; 23, gear; 231, rotating ring; 232, piston one; 233, sliding groove three; 234, sliding strip; 31, outer push plate; 311, sliding rod three; 312, piston two; 313, sliding disc; 314, spring two. DETAILED DESCRIPTION

[0032] ​​Clearly, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] Referring to Figure 1 Figure 13 As shown in the figure, an inner support connecting device for a deep foundation pit support system, comprising a connecting head pipe 1, a support assembly is movably installed inside the connecting head pipe 1, the support assembly comprises a push head 12, a pulley one 13 and a drive shaft 21, the push head 12 is slidingly inserted into the side wall of the connecting head pipe 1, the drive shaft 21 is movably inserted into the inside of the connecting head pipe 1, the inside of the connecting head pipe 1 is integrally formed with a support plate 11, the pulley one 13 is movably installed at the bottom of the support plate 11, the drive shaft 21 is movably inserted into the inside of the pulley one 13 and is in threaded cooperation;

[0035] A locking assembly is movably installed above the support plate 11, the locking assembly comprises a rack 123 and a gear 23, the gear 23 is slidingly 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 are in engagement;

[0036] A tightening assembly is movably installed on the side wall of the push head 12, the tightening assembly comprises a sliding frame 22, a rotating cylinder 224 and a rotating ring 231, the sliding frame 22 is slidingly installed above the support plate 11, the rotating cylinder 224 is rotatably installed above the sliding frame 22, the rotating cylinder 224 is movably sleeved on the outside of the drive shaft 21 and is in threaded cooperation, the rotating ring 231 is rotatably installed on the top of the gear 23, and the rotating ring 231 is slidingly installed below the sliding frame 22;

[0037] A drive assembly is movably installed on the outside of the pulley one 13, the drive assembly is located at the bottom of the support plate 11, and the drive assembly is used to control the extension and contraction of the push head 12.

[0038] As Figure 1 , Figure 2 , Figure 6 and Figure 10 ​As shown, the side wall of the drive shaft 21 is rotatably installed with a connecting block 212, both sides of the connecting block 212 are rotatably installed with support rods 211, one of the support rods 211 is rotatably connected with the side wall of the side of the push head 12 close to the connector pipe 1, and the other support rod 211 is rotatably connected with an inner push plate 213, and the inner push plate 213 is fixedly installed in the inner part of the connector pipe 1.

[0039] As shown in Figure 3 , Figure 8 and Figure 13 , the drive assembly includes a pulley two 132, a synchronous toothed belt 135 and two pulley threes 137, the pulley two 132 is rotatably installed on the bottom of the support plate 11, the bottom of the pulley two 132 is fixedly installed with a shaft coupling 133, both the inner parts of the two pulley threes 137 are rotatably installed with slide rods one 134, the slide rods one 134 are slidably installed on the side wall of the support plate 11, the synchronous toothed belt 135 is movably sleeved on the outer sides of the pulley one 13, the pulley two 132 and the two pulley threes 137, the bottom of the connector pipe 1 is integrally formed with a side plate one 131, and the spring one 136 is arranged between the slide rod one 134 and the side plate one 131.

[0040] Among them, when the connector pipe 1 and the push head 12 are located on the side wall of the enclosing purlin, the worker fixes and connects the output shaft of the external motor with the shaft coupling 133 and starts the external motor, at this time, the pulley two 132 drives the pulley one 13 to rotate through the synchronous toothed belt 135, so that the drive shaft 21 moves downward through the drive of the pulley one 13, in the process of the drive shaft 21 moving downward, the two support rods 211 rotate downward and extend, so that the drive shaft 21 and the push head 12 are close to the enclosing purlin, and the external motor can be removed after the push head 12 abuts against the enclosing purlin.

[0041] As shown in Figure 7 , Figure 8 and Figure 10 , the side wall of the drive shaft 21 is provided with a sliding groove two 214, the inner part of the gear 23 is integrally formed with a sliding strip 234, the sliding strip 234 is slidably installed in the inner part of the sliding groove two 214, the side wall of the rack 123 is rotatably installed with a roller 124, and the roller 124 abuts against the inner wall of the connector pipe 1.

[0042] Among them, after the push head 12 abuts against the enclosing purlin, the gear 23 and the rack 123 are engaged, when the deep foundation pit side wall drives the enclosing purlin to extrude the push head 12, the push 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 one 13 is fixed on the bottom of the support plate 11, so that the drive shaft 21 moves downward, the two support rods 211 continue to push the push head 12 to extrude the enclosing purlin, through the engagement of the rack 123 and the gear 23, the push head 12 is locked, the supporting effect of the push head 12 on the enclosing purlin is improved, and the problem of the push head 12 shrinking inward is avoided.

[0043] As Figure 2 , Figure 5 , Figure 10 and Figure 11 shown, the side wall of the push head 12 is slidingly inserted with the outer push plate 31, the side wall of the outer push plate 31 is integrally formed with the sliding rod three 311, the inside of the push head 12 is provided with the sliding groove one 121, the sliding rod three 311 is slidingly installed in the inside of the sliding groove one 121, the inside of the push head 12 is provided with the air pressure bin 125 and the movable bin 126, the side wall of the outer push plate 31 is fixedly connected with the piston two 312 and the sliding disc 313, the piston two 312 and the sliding disc 313 are respectively slidingly installed in the inside of the air pressure bin 125 and the movable bin 126.

[0044] As Figures 3-10 shown, the top of the support plate 11 is integrally formed with the side plate two 14, the spring two 314 is arranged between the side plate two 14 and the sliding disc 313, the top of the sliding frame 22 is integrally formed with the sealing cylinder 227, the air pipe 122 is arranged between the air pressure bin 125 and the sealing cylinder 227, the top of the rotating ring 231 is integrally formed with the piston one 232, and the piston one 232 is slidingly installed in the inside of the sealing cylinder 227.

[0045] Among them, before the push head 12 abuts against the surrounding purlin, the outer push plate 31 moves out of the side wall of the push head 12 through the abutment of the spring two 314, so that the piston two 312 pulls the piston one 232 upward through the air pressure bin 125 and the air pipe 122, the rotating ring 231 drives the gear 23 to move upward with the piston one 232, so that the gear 23 and the rack 123 are separated, and the push head 12 is unlocked. At this time, the push head 12 is driven to move towards the surrounding purlin by the external motor and the driving shaft 21, when the push head 12 abuts against the surrounding purlin, the side wall of the outer push plate 31 abuts against the push head 12, at this time, the piston two 312 drives the rotating ring 231 and the gear 23 to move downward through the piston one 232, so that the gear 23 and the rack 123 are engaged, and the push head 12 is locked. Through the switching of the outer push plate 31 to lock and unlock the push head 12, it is ensured that the force borne by each internal support structure in the deep foundation pit support process is the same, and the effect of the foundation pit support is avoided to be affected by the different forces borne by the internal support.

[0046] Further described with reference to Figure 5 and Figure 6 , the side wall of the air pipe 122 leads outwardly to a branch pipe (not shown in the figure), when it is necessary to disassemble the internal support structure, the branch pipe is fixedly connected with an external air pump, the external air pump extracts the air in the inside of the air pipe 122, so that the piston one 232 drives the rotating ring 231 and the gear 23 to move upward and unlock the push head 12, at this time, the driving shaft 21 is reversely driven by the external motor and the driving pulley one 13, and drives the push head 12 to shrink.

[0047] As Figure 3 and Figures 7-9As shown, the top of the rotating ring 231 is provided with a sliding groove three 233, the inside of the sliding groove three 233 is slidably installed with a sliding plate 222, the sliding plate 222 penetrates 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 outside of the rotating drum 224 is provided with a spiral sliding groove 225, the sliding ball 226 is slidably installed in the inside of the spiral sliding groove 225, the top of the sliding frame 22 is integrally formed with two side plates three 221, the sliding plate 222 is slidably installed between the two side plates three 221, the side wall of the side plate three 221 is provided with a back-shaped sliding groove 223, the side wall of the sliding plate 222 is integrally formed with a sliding rod two 228, and the sliding rod two 228 is slidably installed in the inside of the back-shaped sliding groove 223.

[0048] Wherein, in the process of the push head 12 abutting against the enclosing purlin, the outer push plate 31 and the enclosing purlin always abut against each other, when the deep foundation pit side wall drives the enclosing purlin to move outward, the outer push plate 31 moves with the enclosing purlin, so that the piston two 312 drives the rotating ring 231 to move upward through the piston one 232, at this time, the push head 12 is in the unlocked state, in the process of the rotating ring 231 moving upward, the sliding plate 222 moves upward with the rotating ring 231, so that the sliding plate 222 drives the rotating drum 224 to rotate through the sliding ball 226 and the spiral sliding groove 225, the driving shaft 21 moves downward through the rotation of the rotating drum 224, so that the push head 12 moves to the direction of the enclosing purlin and abuts against the enclosing purlin, through the detection of the gap between the push head 12 and the enclosing purlin by the outer push plate 31, when there is a gap between the push head 12 and the enclosing purlin, the driving shaft 21 can timely drive the push head 12 to move to the direction of the enclosing purlin and abut against the enclosing purlin, which reduces the number and frequency of maintenance of the inner support structure by workers, and improves the stability and safety during the inner support process.

[0049] The specific working principle and use method of the application are explained in detail as follows: before the push head 12 abuts against the surrounding purlin, the outer push plate 31 is moved out of the side wall of the push head 12 by the abutment of spring 314, so that the piston 312 is pulled upward by the air pressure chamber 125 and the air pipe 122, the rotating ring 231 drives the gear 23 to move upward along with the piston 232, so that the gear 23 and the rack 123 are separated, the push head 12 is unlocked, at this time the worker drives the belt pulley 1 3 to rotate through the external motor, so that the driving shaft 21 moves downward through the driving of the belt pulley 1 3, in the process of downward movement of the driving shaft 21, the two supporting rods 211 rotate downward and extend, so that the driving shaft 21 and the push head 12 are close to the surrounding purlin, when the push head 12 abuts against the surrounding purlin, the worker removes the external motor, at this time the piston 312 drives the rotating ring 231 and the gear 23 to move downward through the piston 232, so that the gear 23 and the rack 123 are engaged, the push head 12 is locked, through the switching of the push head 12 locked and unlocked by the outer push plate 31, it is ensured that the force borne by each internal support structure in the process of deep foundation pit support is the same, so as to avoid that the different forces borne by the internal support affect the effect of foundation pit support, when the deep foundation pit side wall drives the surrounding purlin to extrude the push head 12, the push head 12 drives the gear 23 to rotate through the rack 123, the gear 23 drives the driving shaft 21 to rotate, at this time the belt pulley 1 3 is fixed at the bottom of the supporting plate 1 1, so that the driving shaft 21 moves downward, the two supporting rods 211 continue to push the push head 12 to extrude the surrounding purlin, through the engagement of the rack 123 and the gear 23, the push head 12 is locked, the supporting effect of the push head 12 on the surrounding purlin is improved, and the problem of inward contraction of the push head 12 is avoided, in the process that the push head 12 abuts against the surrounding purlin, when the deep foundation pit side wall drives the surrounding purlin to move outward, the outer push plate 31 moves along with the surrounding purlin, so that the piston 312 drives the rotating ring 231 to move upward through the piston 232, at this time the push head 12 is in an unlocked state, in the process that the rotating ring 231 moves upward, the sliding plate 222 moves upward along with the rotating ring 231, so that the sliding plate 222 drives the rotating cylinder 224 to rotate, the driving shaft 21 moves downward through the rotation of the rotating cylinder 224, so that the push head 12 moves to the direction of the surrounding purlin and abuts against the surrounding purlin, through the detection of the gap between the push head 12 and the surrounding purlin by the outer push plate 31, when there is a gap between the push head 12 and the surrounding purlin, the driving shaft 21 can drive the push head 12 to move to the direction of the surrounding purlin and abut against the surrounding purlin in time, the frequency and times of maintenance of the internal support structure by the worker are reduced, and the stability and safety in the process of internal support are improved, through the cooperation between the locking assembly and the tightening assembly, the internal support structure is always extruded after being connected by bolts, without welding work between each structure, the tightness between the internal support structures and the efficiency of assembly of the internal support structure are improved, and after use, the internal support structure can still be used without cutting operation, so that the cost of the deep foundation pit support system is reduced.

[0050] Further, the fixed connection described above should be understood in a broad sense unless otherwise specified and limited, for example, it can be welding, or gluing, or integrally formed, etc. The means familiar to those skilled in the art.

[0051] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An inner shore connection device for a deep foundation pit support system, comprising a connector pipe (1), characterized in that: The inside of the connecting head pipe (1) movably installs a supporting assembly, the supporting assembly includes a push head (12), a pulley one (13) and a driving shaft (21), the push head (12) is slidingly inserted into the side wall of the connecting head pipe (1), the driving shaft (21) is movably inserted into the inside of the connecting head pipe (1), the inside of the connecting head pipe (1) is integrally formed with a supporting plate (11), the pulley one (13) is movably installed at the bottom of the supporting plate (11), the driving shaft (21) is movably inserted into the inside of the pulley one (13) and is in threaded cooperation; The top of the supporting plate (11) movably installs a locking assembly, the locking assembly includes a rack (123) and a gear (23), the gear (23) is slidingly installed on the outside of the driving shaft (21), the rack (123) is fixedly installed on the side wall of the push head (12), the gear (23) and the rack (123) are in engagement; The side wall of the push head (12) movably installs a tightening assembly, the tightening assembly includes a sliding frame (22), a rotating cylinder (224) and a rotating ring (231), the sliding frame (22) is slidingly installed above the supporting plate (11), the rotating cylinder (224) is rotatably installed above the sliding frame (22), the rotating cylinder (224) is movably sleeved on the outside of the driving shaft (21) and is in threaded cooperation, the rotating ring (231) is rotatably installed on the top of the gear (23), the rotating ring (231) is slidingly installed below the sliding frame (22); The outside of the pulley one (13) movably installs a driving assembly, the driving assembly is located at the bottom of the supporting plate (11), and the driving assembly is used for controlling the extension and contraction of the push head (12).

2. The inner support connecting device for the deep foundation pit support system according to claim 1, characterized in that: The side wall of the driving shaft (21) rotatably installs a connecting block (212), both sides of the connecting block (212) rotatably install supporting rods (211), one of the supporting rods (211) is rotatably connected with the side wall of the push head (12) close to one side of the connecting head pipe (1), and the side wall of the other supporting rod (211) rotatably connects an inner push plate (213), and the inner push plate (213) is fixedly installed in the inside of the connecting head pipe (1).

3. The inner support connecting device for the deep foundation pit support system according to claim 1, characterized in that: The side wall of the driving shaft (21) is provided with a second sliding groove (214), the inside of the gear (23) is integrally formed with a sliding strip (234), the sliding strip (234) is slidingly installed in the inside of the second sliding groove (214), the side wall of the rack (123) rotatably installs a roller (124), and the roller (124) abuts against the inner wall of the connecting head pipe (1).

4. The inner bracing connection of a deep excavation bracing system of claim 1, wherein: The side wall of the push head (12) is slidingly inserted with an outer push plate (31), the side wall of the outer push plate (31) is integrally formed with a sliding rod three (311), the inside of the push head (12) is provided with a sliding groove one (121), the sliding rod three (311) is slidingly installed in the inside of the sliding groove one (121), the inside of the push head (12) is provided with a gas pressure bin (125) and a movable bin (126), the side wall of the outer push plate (31) is fixedly connected with a piston two (312) and a sliding disc (313), the piston two (312) and the sliding disc (313) are slidingly installed in the inside of the gas pressure bin (125) and the movable bin (126) respectively.

5. The inner strut connector of claim 4, wherein: The top of the support plate (11) is integrally formed with a side plate two (14), the sliding disc (313) and the side plate two (14) are provided with a spring two (314) therebetween, the top of the sliding frame (22) is integrally formed with a sealing cylinder (227), the gas pressure bin (125) and the sealing cylinder (227) are provided with a gas pipe (122) therebetween, the top of the swivel ring (231) is integrally formed with a piston one (232), the piston one (232) is slidingly installed in the inside of the sealing cylinder (227).

6. The inner bracing connection of a deep excavation bracing system of claim 1, wherein: The top of the swivel ring (231) is provided with a sliding groove three (233), the inside of the sliding groove three (233) is slidingly installed with a sliding plate (222), the sliding plate (222) penetrates through the top of the sliding frame (22), the side wall of the sliding plate (222) is integrally formed with a sliding bead (226), the outer side of the rotating drum (224) is provided with a spiral sliding groove (225), the sliding bead (226) is slidingly installed in the inside of the spiral sliding groove (225).

7. The inner strut connector of claim 6, wherein: The top of the sliding frame (22) is integrally formed with two side plates three (221), the sliding plate (222) is slidingly installed between the two side plates three (221), the side wall of the side plate three (221) is provided with a back-shaped sliding groove (223), the side wall of the sliding plate (222) is integrally formed with a sliding rod two (228), the sliding rod two (228) is slidingly installed in the inside of the back-shaped sliding groove (223).

8. The inner bracing connection of a deep excavation bracing system of claim 1, wherein: The driving assembly comprises a pulley two (132), a synchronous toothed belt (135) and two pulley threes (137), the pulley two (132) is rotationally installed at the bottom of the support plate (11), the bottom of the pulley two (132) is fixedly installed with a shaft coupling (133), the inside of the two pulley threes (137) is rotationally installed with a sliding rod one (134), the sliding rod one (134) is slidingly installed at the side wall of the support plate (11), the synchronous toothed belt (135) is movably sleeved at the outer side of the pulley one (13), the pulley two (132) and the two pulley threes (137), the bottom of the connecting head pipe (1) is integrally formed with a side plate one (131), the sliding rod one (134) and the side plate one (131) are provided with a spring one (136) therebetween.

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