Assembled steel sheet pile enclosure structure, and construction apparatus and construction method therefor

Abstract

The present invention relates to an assembled steel sheet pile enclosure structure and a construction apparatus and construction method therefor. A waterproof curtain of the enclosure structure is formed by continuously assembling a plurality of steel sheet piles. Guide-rail-type steel enclosing purlins are detachably connected to the waterproof curtain. Self-adaptive flange devices are detachably connected to the guide-rail-type steel enclosing purlins. A hydraulic device, a moving pile clamping device, a vertical rod, and a fixed pile clamping device of the construction apparatus are sequentially connected from bottom to top and are fixed to one side of a base; a counterweight block is fixed on the other side of the base; and pressure-adjustable tires are arranged at the bottom of the base. The construction method comprises: a pushing rod moving towards a foundation pit; a connecting rod assembly driving a moving gear to extend out of a housing and be engaged with a rack of the corresponding guide-rail-type steel enclosing purlin; driving the moving gear to rotate and drive the corresponding self-adaptive flange device to slide to a steel support mounting position along the rack; the pushing rod moving in the direction facing away from the foundation pit; the connecting rod assembly driving the moving gear to be disengaged from the rack; and a brake synchronously extending out of the housing and being meshed and fixed with the rack.

Description

Assembled steel sheet pile retaining structure and construction equipment and method thereof Technical Field

[0001] The present invention relates to the technical field of foundation pit enclosure in municipal engineering in soft soil areas, and in particular to an assembled steel sheet pile enclosure structure and construction equipment and a construction method thereof. Background Art

[0002] Currently, steel sheet pile retaining structures are commonly used in municipal construction projects, such as underground passages and subway stations. These structures offer advantages such as high pile strength, tight connections between piles, excellent water-blocking properties, flexible and simple construction, a short installation period, and reusable sheet piles. The construction process for steel sheet pile retaining structures is as follows: surveying and setting out, positioning piles, pile sinking, pile inspection, soil excavation, construction of purlins and supports, structural backfill, and finally, sheet pile removal (for permanent structures, this is not necessary).

[0003] There are two main methods for driving steel sheet piles: static pile driving and hammer pile driving. Steel sheet piles are usually driven with the pile head applied at the end, meaning the pile driver "clamps" one end and drives the pile vertically into the soil. This method makes it difficult to control the verticality of the pile body during burial. Furthermore, because the length of the steel sheet pile is much greater than its width and thickness, its rigidity is low. During the driving process, the pile body is prone to buckling due to the pressure of the pile driver at the upper end and the resistance of the soil at the lower end. This affects the construction quality of the steel sheet pile retaining structure and may lead to potential safety issues. Furthermore, after excavation, the steel purlins are often welded to the steel sheet pile body and need to be cut after the structure is completed, making the construction process relatively cumbersome.

[0004] Summary of the Invention

[0005] The existing steel sheet pile enclosure structure and its construction method are subject to the problems of buckling during the installation of steel sheet piles, which affects the construction quality and safety of the steel sheet pile enclosure structure. In addition, the construction process is cumbersome and the construction efficiency is low. The purpose of the present invention is to provide an assembled steel sheet pile enclosure structure and its construction equipment and method.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an assembled steel sheet pile enclosure structure, comprising:

[0007] Waterproof curtain, which is made of multiple steel sheet piles assembled continuously along the four sides of the foundation pit;

[0008] The guide rail type steel purlin comprises a horizontally arranged guide beam detachably connected to the waterproof curtain, and a rack extending through the side of the guide beam;

[0009] An adaptive flange device is detachably connected to the guide beam of the guide rail steel purlin, comprising a housing with a middle partition, a push rod, a gear assembly, a connecting rod assembly, a spring assembly, a driver, and a brake disposed within the housing, the push rod and the gear assembly being located on either side of the middle partition, a pair of connecting rod assemblies being symmetrically disposed on either side of the push rod, one end of the connecting rod assembly being hinged to the push rod and the housing, respectively, and the other end thereof passing through the middle partition and connected to the end bearing of the gear assembly, the spring assembly being disposed between the push rod and the middle partition and respectively abutting against both;

[0010] The push rod moves toward the foundation pit under the elastic force of the spring group, and the connecting rod assembly drives the gear assembly to move toward each other. The moving gear of the gear assembly extends out of the housing and engages with the rack of the guide rail steel purlin. The brake connected to one end of the push rod is in a separated state from the rack. The driver drives the moving gear to rotate, causing the adaptive flange device to slide along the guide rail steel purlin to the foundation pit steel support installation position.

[0011] The other end of the push rod is connected to the foundation pit steel support. The push rod moves away from the foundation pit, and the connecting rod assembly drives the gear assembly to move toward each other. The moving gear of the gear assembly retracts into the housing and simultaneously pushes the brake out of the housing and is clamped and fixed with the rack.

[0012] The assembled steel sheet pile enclosure structure of the present invention comprises a waterproof curtain, a guide rail type steel purlin and an adaptive flange device. The waterproof curtain is continuously assembled by a plurality of steel sheet piles. The guide rail type steel purlin is horizontally arranged and detachably connected to the waterproof curtain. The adaptive flange device is detachably connected to the guide crossbeam of the guide rail type steel purlin. The push rod moves toward the direction close to the foundation pit under the action of the spring group, and the connecting rod assembly drives the gear assembly to move toward each other, so that the moving gear extends out of the shell and meshes with the rack of the guide rail type steel purlin. The driver drives the moving gear to rotate, driving the adaptive flange device to slide along the rack of the guide rail type steel purlin to the installation position of the foundation pit steel support, thereby realizing the function of automatically adjusting the horizontal position of the adaptive flange device; after the front end of the push rod is connected to the foundation pit steel support, the push rod is controlled to move away from the foundation pit, and the connecting rod assembly drives the gear assembly to move toward each other, the moving gear disengages from the rack and retracts into the shell, and the push rod The brake is pushed out of the housing simultaneously and clamped to the rack to realize the braking function under the stress state of the foundation pit steel support; since the steel sheet piles, guide rail steel purlins and adaptive flange devices are all prefabricated components in the factory, the manufacturing accuracy of each component is guaranteed; the components are assembled into an integrated retaining structure through detachable connections, which avoids welding operations, reduces the construction difficulty of the retaining structure and shortens the construction period; after the construction of the internal structure of the foundation pit is completed, the components can be recycled and reused, reducing the project cost; the adaptive flange device uses a gear rack mechanism to automatically slide along the guide rail steel purlin to the installation position of the foundation pit steel support, and is clamped to the rack by the brake. Construction personnel can remotely and automatically control the sliding and braking of the adaptive flange device, so that the flange device can adapt to the installation position of the foundation pit steel support, improve the efficiency of the automated assembly operation of the retaining structure, and ensure the safety of on-site construction operations.

[0013] Furthermore, the steel sheet pile is provided with a plurality of pairs of concave snap-in openings at intervals along its length direction, and each pair of concave snap-in openings are symmetrically arranged along the thickness direction of the steel sheet pile and are non-through-through arranged on both sides of the steel sheet pile, and each concave snap-in opening is composed of a concave snap-in groove and an embedded opening that are interconnected from the outside to the inside.

[0014] Furthermore, the guide beam of the guide rail type steel purlin is a steel beam with a C-shaped cross section, and a rack is arranged through the middle of the inner side of the web of the guide beam, and the teeth of the rack are facing the direction of the foundation pit. A plurality of convex snap-in slots are arranged at intervals along the length extension direction of the outer side of the web of the guide beam, and the plurality of convex snap-in slots correspond to the positions of the concave snap-in slots in the horizontal direction of the waterproof curtain, and the convex snap-in slots match the concave snap-in slots of the steel sheet piles. The external elastic mechanical snap-in device arranged at the end of the convex snap-in slot matches the embedded slot of the steel sheet pile, so that the guide beam can be snap-connected to the waterproof curtain.

[0015] Furthermore, the shell of the adaptive flange device includes an outer ring shell, an inner ring shell, a bottom plate, a middle partition plate, a limit plate and a head ring. The outer ring shell and the inner ring shell are both hollow cylindrical structures. The head ring is embedded in one end of the outer ring shell, and two outer ring hinges are symmetrically arranged along the axis of the shell at the other end of the outer ring shell. One end of the connecting rod assembly is hingedly connected to the outer ring hinge. One end of the inner ring shell is connected to the outer ring shell, and the other end is connected to the bottom plate. The middle partition plate is vertically arranged in the middle of the inner ring shell cavity, and a hole is opened in the middle of the bottom plate. The moving gear and the brake can pass through the hole in sequence under the push of the push rod; the two wing plate ends of the guide beam They are respectively connected with T-joints set through, a pair of C-grooves and a pair of bayonet plates are symmetrically set on the outside of the base plate, the T-joint is tightly embedded in the groove of the C-groove, and the bayonet plate with an L-shaped cross-section is bolted to the outer end of the C-groove and clamps the T-joint, so that the adaptive flange device can be snap-connected to the guide rail steel purlin, a pair of limit plates are horizontally and symmetrically arranged between the middle partition plate and the base plate along the axis of the inner ring shell to form two limit cavities, and a pair of bearings of the gear assembly are respectively embedded in the two limit cavities; a long hole is opened in the middle of the limit plate, and the rotating shaft of the gear assembly passes through the long hole and can slide along the long hole.

[0016] Furthermore, the gear assembly includes a rotating shaft, a moving gear, a bearing, a sliding ring and a sliding ring hinge. The moving gear is fixed to the middle of the rotating shaft, and the moving gear is meshed with the motor gear of the driver. A pair of bearings are respectively embedded in two limiting cavities formed by the limiting plate, the middle partition plate and the bottom plate. The two ends of the rotating shaft pass through the long holes of the limiting plate and are fixedly connected with a pair of bearings, and the rotating shaft can slide along the long holes of the limiting plate, so that the gear assembly can adjust the distance between it and the rack under the action of the top thrust; the sliding ring is wrapped around the bearing and forms a whole with the bearing bottom plate and the bearing top plate located on both sides of the bearing. A sliding ring hinge is arranged on the outside of the sliding ring, and the other end of the connecting rod assembly is hingedly connected to the sliding ring.

[0017] Furthermore, the driver includes a motor, a motor shaft and a motor gear. The motor is vertically arranged on one side of the shell. The motor, motor shaft and motor gear are connected in sequence. The motor gear is located in the middle of the shell and meshes with the moving gear of the gear assembly.

[0018] Furthermore, the push rod includes a cylinder base, a cylinder body, a piston rod, a flange and a base hinge. The cylinder body is fixed to the cylinder base, and the cylinder body is embedded in the inner cavity of the shell and can slide horizontally along its axis. One end of the piston rod is sleeved in the inner cavity of the cylinder body and can move relative to the cylinder body. The other end of the piston rod is fixed to the flange, and the flange is connected to the foundation pit steel support bolts. A pair of base hinges are symmetrically arranged on the edge of the cylinder base along the axis of the shell, and a connecting rod of the connecting rod assembly is hingedly connected to the cylinder base hinge.

[0019] Furthermore, the connecting rod assembly consists of a connecting rod 1, a connecting rod 2 and a connecting rod 3, which are hingedly connected end to end in sequence. The connecting rod 1 and the connecting rod 3 are both I-shaped rods. The two ends of the connecting rod 1 are respectively hingedly connected to the cylinder base at the bottom of the push rod and the connecting rod 2. The connecting rod 2 is an L-shaped rod. A hinge is respectively provided in the middle and at both ends of the connecting rod 2. The hinge located in the middle position is hingedly connected to the outer ring hinge fixed to the outer ring shell, and the hinges located at both ends are respectively hingedly connected to the connecting rod 1 and the connecting rod 3. The two ends of the connecting rod 3 are respectively hingedly connected to the end of the connecting rod 2 and the sliding ring hinge.

[0020] Furthermore, the spring group is symmetrically arranged along the axis of the shell and is respectively located on both sides of the through hole of the middle partition. The spring group includes a spring rod, a spring sleeve and a spring. One end of the spring rod is connected to the middle partition, and one end of the spring sleeve is connected to the push rod. The spring sleeve is sleeved on the spring rod and can slide relative to the spring rod. The spring is sleeved on the outside of the spring rod and the spring sleeve.

[0021] Furthermore, the brake is a plate-shaped structure, one end of the brake is fixed to the push rod, and the other end is provided with teeth matching the rack, and the teeth of the brake can engage with the rack.

[0022] Furthermore, the steel sheet pile is symmetrically provided with a pair of slots and a pair of sealing holes on both sides along its width direction. The cross section of the slot is V-shaped, the pointed end of the slot is located at the edge of the steel sheet pile, and the other end of the slot is connected with the sealing hole. The hollowing depth of the slot and the sealing hole in the steel sheet pile is greater than the excavation depth of the foundation pit. The lower part of the hollow part of the steel sheet pile is solid. The slots of two adjacent steel sheet piles are arranged correspondingly and are spliced ​​by inserting cross steels into the slots of the two adjacent steel sheet piles. The sealing holes are used for injecting waterproof sealing slurry.

[0023] The present invention also provides a construction device for an assembled steel sheet pile enclosure structure, which includes a base, an adjustable pressure tire, a fixed pile clamp, a mobile pile clamp, a vertical pole, a hydraulic device, a leveling device, and a counterweight. A plurality of adjustable pressure tires are symmetrically arranged on both sides of the base. The hydraulic device, the mobile pile clamp, the vertical pole, and the fixed pile clamp are sequentially connected and fixed to one side of the base from bottom to top. The fixed pile clamp is used to temporarily fix the steel sheet piles. The mobile pile clamp can move vertically under the action of the hydraulic device and is used to drive the steel sheet piles. The leveling device is arranged on the top of the fixed pile clamp. The counterweight is fixed to the other side of the base. The fixed pile clamp and the mobile pile clamp are both provided with a pair of clamps that can extend and retract in the horizontal direction. The clamps can be clamped and fixed with a concave snap-in on both sides of the steel sheet pile. The construction device for the assembled steel sheet pile enclosure structure solves the problem of difficulty in controlling the position and verticality during the existing steel sheet pile driving process. Moreover, the construction equipment has a low net height and can successfully complete pile driving construction under limited space.

[0024] In addition, the present invention also provides a construction method of an assembled steel sheet pile enclosure structure, the steps of which are as follows:

[0025] S1: Prefabricate a corresponding number of steel sheet piles, rail-type steel purlins, and adaptive flange devices, drive multiple steel sheet piles into the ground one by one, and assemble multiple steel sheet piles continuously to form an integral waterproof curtain;

[0026] S2: After excavating the foundation pit to a certain depth, install the guide rail steel purlin horizontally and detachably connect it to the waterproof curtain. Snap the adaptive flange device onto the guide beam of the guide rail steel purlin, and install the rack through the side of the guide beam.

[0027] S3: When the flange is not connected to the foundation pit steel support, the push rod moves toward the foundation pit under the elastic force of the spring group, the brake and the rack are in a separated state, and the connecting rod assembly drives the gear assembly to move toward each other, so that the moving gear of the gear assembly extends out of the housing and engages with the rack. The driver drives the moving gear to rotate, driving the adaptive flange device to slide horizontally along the guide rail steel purlin to the steel support installation position;

[0028] Connect the foundation pit steel support bolts to the flange plate, move the push rod away from the foundation pit, and the connecting rod assembly drives the gear assembly to move toward each other, so that the moving gear of the gear assembly is separated from the rack. At the same time, the brake extends out of the housing and engages with the rack, so that the adaptive flange device is clamped and fixed to the guide rail steel purlin. When the push force reaches the set requirement, the push rod is pressed against the middle partition through the spring group;

[0029] This process is repeated to complete the installation of foundation pit steel supports one by one;

[0030] S4: Rebuild the underground structure, remove the foundation pit steel support, adaptive flange device and guide rail steel purlin, and pull out the steel sheet piles.

[0031] The construction method of the assembled steel sheet pile retaining structure of the present invention is as follows: first, a plurality of steel sheet piles are driven into the ground one by one and continuously assembled into an integral waterproof curtain, a guide rail type steel purlin is horizontally arranged and detachably connected to the waterproof curtain, and an adaptive flange device is clamped on the guide beam of the guide rail type steel purlin. When the push rod moves horizontally toward the foundation pit under the action of the spring group, the connecting rod assembly drives the moving gear to move in opposite directions, so that the moving gear is engaged with the rack of the guide rail type steel purlin. The control system controls the driver to drive the moving gear to rotate, driving the adaptive flange device to move horizontally along the guide beam to the steel support installation position; the steel support bolt is connected to the flange plate of the push rod. When the push rod is controlled to move away from the foundation pit, the connecting rod assembly drives the moving gear to move in opposite directions, and the moving gear disengages from the rack and retracts into the shell. At the same time, the brake extends out of the shell and is clamped and fixed with the rack of the guide rail type steel purlin. The adaptive flange device uses a gear rack mechanism to automatically slide along the guide-type steel purlin to the steel support installation position, and is clamped and fixed to the rack by a brake. Construction personnel can remotely and automatically control the sliding and braking of the adaptive flange device, so that the flange device can adapt to the installation position of the foundation pit steel support, improving the efficiency of the automated assembly operation of the enclosure structure and ensuring the safety of on-site construction operations.

[0032] Furthermore, the step S1 further includes:

[0033] S101: Using construction equipment for assembled steel sheet pile retaining structures, the steel sheet piles are lifted vertically, the fixture of the fixed pile clamp extends outwards to clamp and fasten the concave snaps on both sides of the steel sheet piles, the hydraulic device lifts the mobile pile clamp, and after the fixture of the mobile pile clamp extends outwards to clamp and fasten the concave snaps on both sides of the steel sheet piles, the fixture of the fixed pile clamp is released, the hydraulic device retracts, and the mobile pile clamp drives the steel sheet piles to descend synchronously and drive them into the soil. After the mobile pile clamp descends to the bottom, the fixture of the fixed pile clamp extends outwards again and clamps and fastens the concave snaps on both sides of the steel sheet piles. The fixture of the mobile pile clamp releases the steel sheet pile until a concave snap on the top of the steel sheet pile is exposed to the ground, which is used for water blocking during construction and pulling after the structure is completed;

[0034] S102: After multiple steel sheet piles are continuously driven into the ground, the slots between adjacent steel sheet piles are aligned, cross steel is embedded in two adjacent slots, and waterproof sealing slurry is driven into the sealing holes, so that the multiple steel sheet piles are consolidated into a waterproof curtain.

[0035] Furthermore, step S2 also includes: embedding multiple convex snap-fits of the guide beam of the guide rail type steel purlin into multiple concave snap-fits in the horizontal direction of the waterproof curtain, so that the guide rail type steel purlin is snap-connected to the waterproof curtain, and the C-shaped groove of the adaptive flange device is mounted on the T-shaped joint of the guide rail type steel purlin, and the snap-fit ​​plate bolts are fixed to the outside of the C-shaped groove, so that the adaptive flange device is snap-connected to the guide rail type steel purlin. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 shows the steel sheet piles in one embodiment of the assembled steel sheet pile enclosure structure of the present invention;

[0037] FIG2 is a schematic structural diagram of a concave bayonet of a steel sheet pile according to an embodiment of the present invention;

[0038] FIG3 is a top view of FIG1 ;

[0039] FIG4 is a schematic structural diagram of a cross steel plate according to an embodiment of the present invention;

[0040] FIG5 is a perspective view of a guide rail type steel purlin according to an embodiment of the present invention;

[0041] FIG6 is a side view of an adaptive flange device and a guide rail type steel purlin according to an embodiment of the present invention;

[0042] FIG7 is a schematic structural diagram of an adaptive flange device and a guide rail type steel purlin according to an embodiment of the present invention;

[0043] FIG8 is a cross-sectional view taken along line AA of FIG7 ;

[0044] FIG9 is a schematic structural diagram of a guide rail type steel purlin according to an embodiment of the present invention;

[0045] FIG10 is a side view of FIG9;

[0046] FIG11 is a top view of FIG9;

[0047] FIG12 is a schematic structural diagram of an adaptive flange device according to an embodiment of the present invention;

[0048] FIG13 is a schematic structural diagram of a housing according to an embodiment of the present invention;

[0049] FIG14 is a schematic structural diagram of a gear assembly according to an embodiment of the present invention;

[0050] FIG15 is a schematic structural diagram of a spring assembly according to an embodiment of the present invention;

[0051] FIG16 is a schematic structural diagram of a push rod according to an embodiment of the present invention;

[0052] FIG17 is a schematic structural diagram of a connecting rod assembly according to an embodiment of the present invention;

[0053] FIG18 is a schematic structural diagram of the construction equipment of the assembled steel sheet pile enclosure structure of the present invention;

[0054] FIG19 is a sectional view taken along line BB of FIG18 ;

[0055] FIG20 is a schematic diagram of a construction method of an assembled steel sheet pile enclosure structure according to the present invention;

[0056] FIG21 is a schematic diagram of the assembled steel sheet pile retaining structure of the present invention after construction is completed.

[0057] The numbers in the figure are as follows:

[0058] Steel sheet pile 10; concave snap-in 11; concave snap-in slot 111; embedded opening 112; snap-in slot 12; sealing hole 14; cross steel 15; guide rail steel purlin 100; convex snap-in 101; guide beam 102; T-joint 103; rack 104;

[0059] Adaptive flange device 200; driver 210; motor shaft 211; motor gear 212; housing 220; outer ring shell 221; head ring 222; elastic pad 222′; sliding gasket 223; outer ring hinge 224; middle partition 225; limit plate 226; bottom plate 227; bayonet plate 228; inner ring shell 229; gear assembly 230; moving gear 231; rotating shaft 232; sliding ring hinge 2 33; bearing 234; sliding ring 235; bearing bottom plate 236; bearing top plate 237; flange 240; spring assembly 250; spring 251; spring rod 252; spring sleeve 253; push rod 260; piston rod 261; cylinder body 262; cylinder base 263; base hinge 264; brake 265; connecting rod assembly 270; connecting rod 1 271; connecting rod 272; connecting rod 3 273;

[0060] Construction equipment 40 of an assembled steel sheet pile retaining structure; a base 41; a pressure-adjustable tire 42; a fixed pile clamp 46; a movable pile clamp 44; a vertical pole 45; a hydraulic device 43; a leveling device 47; a counterweight 48; and a clamp 49. DETAILED DESCRIPTION

[0061] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in very simplified form and not in exact proportions, and are only used for the purpose of conveniently and clearly explaining the embodiments of the present invention.

[0062] For the convenience of description, the "up" and "down" mentioned below are consistent with the up and down directions in the accompanying drawings. The front end refers to the end facing the foundation pit, and the rear end refers to the end close to the steel sheet pile 10, but this cannot be a limitation of the technical solution of the present invention.

[0063] Example 1

[0064] 1 to 17 illustrate the assembled steel sheet pile enclosure structure of the present invention, which includes:

[0065] Waterproof curtain, which is made of multiple steel sheet piles assembled continuously along the four sides of the foundation pit;

[0066] The guide rail type steel purlin 100 includes a guide beam 102 which is horizontally arranged and detachably connected to the waterproof curtain, and a rack 104 which is provided through the side of the guide beam 102;

[0067] The adaptive flange device 200 is detachably connected to the guide beam 102 of the guide rail steel purlin 100. It includes a housing 220 with a middle partition 225, a push rod 260, a gear assembly 230, a connecting rod assembly 270, a spring assembly 250, a driver 210, and a brake 265 disposed within the housing 220. The push rod 260 and the gear assembly 230 are respectively located on either side of the middle partition 225. A pair of connecting rod assemblies 270 are symmetrically disposed on either side of the push rod 260. One end of the connecting rod assembly 270 is hinged to the rear end of the push rod 260 and the housing 220, respectively, and the other end thereof passes through the middle partition 225 and is connected to the end bearing 234 of the gear assembly 230. The spring assembly 250 is disposed between the push rod 260 and the middle partition 225 and respectively abuts against both.

[0068] The push rod 260 moves toward the foundation pit under the elastic force of the spring assembly 250, and the connecting rod assembly 270 drives the gear assembly 230 to move toward it. The moving gear 231 of the gear assembly 230 extends out of the housing 220 and meshes with the rack 104 of the guide rail steel purlin 100. The brake 265 connected to the rear end of the push rod 260 is separated from the rack 104. The control system (not shown) controls the driver 210 to drive the moving gear 231 to rotate, so that the adaptive flange device 200 slides along the guide rail steel purlin 100 to the foundation pit steel support installation position;

[0069] The front end of the push rod 260 is connected to the steel support of the foundation pit. The control system controls the push rod 260 to move away from the foundation pit. The connecting rod assembly 270 drives the gear assembly 230 to move toward each other. The moving gear 231 of the gear assembly 230 retracts into the shell 220 and synchronously pushes the brake 265 out of the shell 220 and is clamped and fixed to the rack 104.

[0070] The assembled steel sheet pile enclosure structure of the present invention includes a waterproof curtain, a guide rail steel purlin 100 and an adaptive flange device 200. The waterproof curtain is continuously assembled by a plurality of steel sheet piles 10. The guide rail steel purlin 100 is horizontally arranged and detachably connected to the waterproof curtain. The adaptive flange device 200 is detachably connected to the guide beam 102 of the guide rail steel purlin 100. The push rod 260 moves toward the foundation pit under the action of the spring group 250, and the connecting rod assembly 270 drives the gear assembly 230 to move toward each other, so that the moving gear 2 31 extends out of the housing 220 and meshes with the rack 104 of the guide rail steel purlin 100. The driver 210 drives the moving gear 231 to rotate, driving the adaptive flange device 200 to slide along the rack 104 of the guide rail steel purlin 100 to the installation position of the foundation pit steel support, thereby realizing the function of automatically adjusting the horizontal position of the adaptive flange device 200. After the front end of the push rod 260 is connected to the foundation pit steel support, the push rod 260 is controlled to move away from the foundation pit, and the connecting rod assembly 270 drives the gear assembly 230 to move toward each other, and the moving gear 2 31 is separated from the rack 104 and retracted into the housing 220, and the push rod 260 simultaneously pushes the brake 265 out of the housing 220 and is clamped and fixed with the rack 104, realizing the braking function under the stress state of the foundation pit steel support; since the steel sheet pile 10, the guide rail type steel purlin 100 and the adaptive flange device 200 are all prefabricated components in the factory, the manufacturing accuracy of each component is guaranteed; the components are assembled into an integrated enclosure structure through detachable connections, avoiding welding operations, reducing the construction difficulty of the enclosure structure and shortening the construction period; in the foundation pit After the construction of the partial structure is completed, the various components can be recycled and reused, reducing the project cost; the adaptive flange device 200 uses the gear rack 104 mechanism to automatically slide along the guide rail steel purlin 100 to the foundation pit steel support installation position, and is clamped and fixed to the rack 104 through the brake 265. Construction personnel can remotely and automatically control the sliding and braking of the adaptive flange device 200, so that the flange device can adapt to the installation position of the foundation pit steel support, improve the efficiency of the automatic assembly operation of the enclosure structure, and ensure the safety of on-site construction operations.

[0071] As shown in Figures 1 and 2, the steel sheet pile 10 is provided with multiple pairs of recessed notches 11 spaced apart along its length. Each pair of recessed notches 11 is symmetrically arranged along the thickness of the steel sheet pile 10 and is non-throughout, located on either side of the pile. Each recessed notch 11 consists of a continuous recessed slot 111 and an internal notch 112, from the outside to the inside. The recessed slot 111 mates with the convex notch 101 on the web of the guide beam 102, while the internal notch 112 mates with an externally resilient mechanical snap-fit ​​device at the end of the convex notch 101, enabling the rail-type steel purlin 100 to be snap-fitted to the waterproof curtain. The steel sheet pile 10 of this embodiment is approximately 20-30 cm thick, and the recessed notches 11 are approximately 1 / 4-1 / 5 the thickness of the sheet. A plurality of pairs of recessed snap-fits 11 spaced apart along the length direction of the steel sheet pile 10 can be snap-connected with the clamp 49 of the pile clamp of the construction equipment 40, making it convenient for the construction equipment 40 to clamp the steel sheet pile 10 to carry out pile sinking and pile extraction construction, and also making it convenient for construction personnel to flexibly and quickly adjust the installation position of the guide rail steel purlin 100 and the adaptive flange device 200 according to the installation height of the foundation pit steel support at the construction site.

[0072] As shown in Figures 9 to 11, the guide beam 102 of the guide rail type steel purlin 100 is a steel beam with a C-shaped cross section. A rack 104 is provided through the middle of the inner side of the web of the guide beam 102, and the teeth of the rack 104 are facing the direction of the foundation pit. A plurality of convex snap-in slots 101 are provided at intervals along the length extension direction of the outer side of the web of the guide beam 102. The plurality of convex snap-in slots 101 correspond to the positions of the concave snap-in slots 11 in the horizontal direction of the waterproof curtain, and the convex snap-in slots 101 and the external elastic mechanical snap-in device provided on the top match the concave snap-in slots 11 of the steel sheet pile 10, so that the guide beam 102 can be snap-connected to the waterproof curtain; further, the two wing plate ends of the guide beam 102 are respectively connected with a through-set T-joint 103, and the C-shaped groove of the adaptive flange device 200 is snap-connected to the T-joint, so that the adaptive flange device 200 is snap-connected to the guide rail type steel purlin 100.

[0073] As shown in FIG13 , the shell 220 of the adaptive flange device 200 includes an outer ring shell 221 , an inner ring shell 229 , a bottom plate 227 , a middle partition plate 225 , a limit plate 226 and a head ring 222 . The outer ring shell 221 and the inner ring shell 229 are both hollow cylindrical structures. The outer ring shell 221 is arranged close to one side of the foundation pit, and its inner diameter is 1 to 5 mm larger than the outer diameter of the cylinder body 262 of the push rod 260, and the cylinder body 262 can slide freely in the horizontal direction of the inner cavity of the outer ring shell 221; the front end of the outer ring shell 221 is embedded with the head ring 222, and the rear end of the head ring 222 is provided with an elastic pad 222′, and the front end of the cylinder body 262 is in contact with the elastic pad 222′ to cushion the impact of the cylinder body 262; the inner diameter of the head ring 222 is smaller than the outer diameter of the cylinder body 262 and larger than the outer diameter of the cylinder piston rod 261, so that the cylinder piston rod 261 can pass freely along the hole in the middle of the head ring 222; the rear end of the outer ring shell 221 is symmetrically provided with two outer ring hinges 224 along the axis of the shell body 220, and one end of the connecting rod assembly 270 is hingedly connected to the outer ring hinge 224. The inner ring shell 229 is arranged near one side of the steel sheet pile 10. The front end of the inner ring shell 229 is connected to the outer ring shell 221, and the rear end thereof is connected to the bottom plate 227. The middle partition plate 225 is vertically arranged in the middle of the cavity of the inner ring shell 229. A hole is opened in the middle of the bottom plate 227. The moving gear 231 and the brake 265 can pass through the hole in sequence under the push of the push rod 260; a pair of C-shaped grooves and a pair of bayonet plates 228 are symmetrically arranged on the outside of the bottom plate 227. The T-shaped joint 103 of the guide beam 102 is tightly embedded in the groove of the C-shaped groove. The bayonet plate 228 with an L-shaped cross-section is bolted to the outer end of the C-shaped groove and clamps the T-shaped joint 103 of the guide beam 102, so that the adaptive flange device 200 can be snap-connected to the guide rail type steel purlin 100. In addition, a sliding gasket 223 is provided on the inner surface of the C-shaped groove. The sliding gasket 223 is made of polytetrafluoroethylene material to reduce sliding friction. A pair of limiting plates 226 are horizontally and symmetrically arranged between the middle partition plate 225 and the bottom plate 227 along the axis of the inner ring shell 229 to form two limiting cavities. A pair of bearings 234 of the gear assembly 230 are respectively embedded in the two limiting cavities to limit the gear assembly 230. A long hole is provided in the middle of the limiting plate 226, and the rotating shaft 232 of the gear assembly 230 passes through the long hole and can slide along the long hole. The middle partition plate 225 is also provided with a through hole for the connecting rod 3 273 of the connecting rod assembly 270, the moving gear 231, and the brake 265 to pass through.

[0074] As shown in Figure 8, the driver 210 includes a motor (not shown), a motor shaft 211 and a motor gear 212. The motor is vertically arranged on one side of the housing 220 and is connected to the control system signal. The motor, motor shaft 211 and motor gear 212 are connected in sequence. The motor gear 212 is located in the middle of the housing 220 and is engaged with the moving gear 231 of the gear assembly 230. The motor drives the motor gear 212 to rotate in forward and reverse directions, thereby driving the moving gear 231 of the gear assembly 230 to rotate synchronously, so that construction personnel can adjust the horizontal position of the adaptive flange device 200 by controlling the opening and closing of the motor.

[0075] As shown in Figure 14, the gear assembly 230 includes a rotating shaft 232, a moving gear 231, a bearing 234, a sliding ring 235 and a sliding ring hinge 233. The moving gear 231 is fixed to the middle of the rotating shaft 232, and the moving gear 231 is meshed with the motor gear 212 of the driver 210. A pair of bearings 234 are respectively embedded in the two limiting cavities formed by the limiting plate 226, the middle partition plate 225 and the bottom plate 227. The two ends of the rotating shaft 232 respectively pass through the long holes of the limiting plate 226 and are embedded and connected with the pair of bearings 234, and the rotating shaft 232 can move along the limiting plate 226. The long strip hole slides, so that the gear assembly 230 can adjust the distance between it and the rack 104 under the action of the top thrust; further, the bearing 234 is wrapped with a sliding ring 235, and forms a whole with the bearing bottom plate 227 and the bearing top plate 237 located on both sides of the bearing 234, so that the rotating shaft 232 can rotate freely in the sliding ring 235, and a sliding ring hinge 233 is set on the outside of the sliding ring 235. The other end of the connecting rod assembly 270 is hingedly connected to the sliding ring 235, and the sliding ring 235 is pulled by the connecting rod assembly 270 to drive the gear assembly 230 to move horizontally.

[0076] As shown in Figure 16, the push rod 260 includes a cylinder base 263, a cylinder body 262, a piston rod 261, a flange 240 and a base hinge 264. The rear end of the cylinder body 262 is fixed to the cylinder base 263. The cylinder body 262 is embedded in the inner cavity of the outer ring shell 221 and can slide horizontally along its axis. One end of the piston rod 261 is sleeved in the inner cavity of the cylinder body 262 and can move relative to the cylinder body 262. The other end of the piston rod 261 is fixed to the flange 240. The flange 240 is connected to the foundation pit steel support bolts. A pair of base hinges 264 are symmetrically arranged on the edge of the cylinder base 263 along the axis of the shell 220. The connecting rod 271 of the connecting rod assembly 270 is hingedly connected to the hinge of the cylinder base 263; the push rod 260 is connected to the control system signal.

[0077] As shown in Figure 17, the connecting rod assembly 270 consists of a connecting rod 1 271, a connecting rod 272 and a connecting rod 3 273, which are hingedly connected end to end. The connecting rod 1 271 and the connecting rod 3 are both I-shaped rods. The two ends of the connecting rod 1 271 are respectively hingedly connected to the cylinder base 263 at the bottom of the push rod 260 and the connecting rod 2 272. The connecting rod 2 272 is an L-shaped rod. A hinge is provided in the middle and at both ends of the connecting rod 2 272. The hinge located in the middle is hingedly connected to the outer ring hinge 224 fixed to the outer ring shell 221, and the hinges located at both ends are respectively hingedly connected to the connecting rod 1 271 and the connecting rod 3 273. The two ends of the connecting rod 3 273 are respectively hingedly connected to the end of the connecting rod 2 272 and the sliding ring hinge 233. The connecting rod assembly 270 can be used to achieve the conversion of the pushing direction, so that the gear assembly 230 and the pushing rod 260 move towards each other, that is, the moving gear 231 and the brake 265 move in opposite directions, and the sliding and braking of the adaptive flange device 200 are achieved through the extension and retraction of the pushing rod 260.

[0078] As shown in Figures 7 and 15, in this embodiment, two spring groups 250 are symmetrically arranged along the axis of the shell 220 and are respectively located on both sides of the through hole of the middle partition 225. The spring group 250 includes a spring rod 252, a spring sleeve 253 and a spring 251. One end of the spring rod 252 is connected to the middle partition 225, and one end of the spring sleeve 253 is connected to the cylinder base 263. The spring sleeve 253 is sleeved on the spring rod 252 and can slide relative to the spring rod 252. The spring 251 is sleeved on the outside of the spring rod 252 and the spring sleeve 253. When the foundation pit steel support is not connected, the spring group 250 is in a semi-compressed state. The elastic force of the spring group 250 tightens the front end of the push rod 260 against the elastic pad 222' of the head ring 222, and the rear end of the push rod 260 is against the spring group 250.

[0079] As shown in Figure 8, the brake 265 is arranged between the two spring groups 250. The brake 265 is a plate-shaped structure. The front end of the brake 265 is fixed to the push rod 260, and the rear end thereof is provided with teeth matching the rack 104. The teeth of the brake 265 can engage with the rack 104, thereby realizing the braking of the adaptive flange device 200. The positions of the brake 265 and the moving gear 231 are staggered to avoid interference between the two.

[0080] As shown in Figures 3 and 4, the steel sheet pile 10 is also symmetrically provided with a pair of slots 12 and a pair of sealing holes 14 on both sides along its width direction. The cross section of the slot 12 is V-shaped, and the pointed end of the slot 12 is located at the edge of the steel sheet pile 10, and the other end of the slot 12 is connected to the sealing hole 14; the hollowing depth of the slot 12 and the sealing hole 14 in the steel sheet pile 10 is slightly greater than the excavation depth of the foundation pit, and the lower part of the hollow part of the steel sheet pile 10 is solid. As shown in Figure 21, the dotted line represents the excavation depth of the foundation pit, and the dotted line represents the hollowing depth of the slot 12 and the sealing hole 14. The slots 12 of two adjacent steel sheet piles 10 are correspondingly arranged and spliced ​​by inserting the cross steel 15 into the slots 12 of the two adjacent steel sheet piles 10. The sealing hole 14 is used to drive a waterproof sealing slurry. After the waterproof sealing slurry fills the sealing holes 14 and the slots 12 of the two adjacent steel sheet piles 10, multiple continuously arranged steel sheet piles 10 are fixed into an integrated waterproof curtain.

[0081] Example 2

[0082] 18 and 19 illustrate the construction equipment 40 of the assembled steel sheet pile enclosure structure of this embodiment, which includes a base 41, an adjustable pressure tire 42, a fixed pile clamp 46, a mobile pile clamp 44, a vertical pole 45, a hydraulic device 43, a leveling device 47 and a counterweight 48. A plurality of adjustable pressure tires 42 are symmetrically arranged on both sides of the base 41. The hydraulic device 43, the mobile pile clamp 44, the vertical pole 45 and the fixed pile clamp 46 are sequentially connected and fixed to one side of the base 41 from bottom to top. The fixed pile clamp 46 is used to temporarily fix the steel sheet pile 10. The mobile pile clamp 44 can move vertically under the action of the hydraulic device 43 and is used to drive the steel sheet pile 10. The leveling device 47 is provided on the top of the fixed pile clamp 46 for real-time monitoring of the position and verticality of the steel sheet pile 10. A counterweight 48 is fixed to the other side of the base 41 to prevent the pile driver from becoming unbalanced due to excessive soil resistance during pile sinking. A pair of clamps 49 are provided on the inside of the fixed pile clamp 46 and the movable pile clamp 44, which can extend and retract in the horizontal direction. An external spring mechanical snap device is provided at the end of the clamp 49. The clamp 49 and the external spring mechanical snap device can be clamped and fixed with a concave snap-in 11 on both sides of the steel sheet pile 10 to ensure the stability of the steel sheet pile 10. During the pile sinking process, if the leveling device 47 shows that the verticality of the pile body is incorrect, it is leveled by the pressure drop of multiple pressure-adjustable tires 42, which solves the problem of difficulty in controlling the position and verticality during the existing steel sheet pile 10 driving construction process. Moreover, the construction equipment 40 has a low net height and can successfully complete the pile sinking construction under limited space.

[0083] Example 3

[0084] 20 and 21 illustrate the construction method of the assembled steel sheet pile enclosure structure according to the embodiment 1, the specific steps are as follows:

[0085] S1: Survey and stake out the ground and carry out relevant treatment on the foundation. Construction equipment and other equipment are brought to the site. A corresponding number of steel sheet piles 10, rail-type steel purlins 100 and adaptive flange devices 200 are prefabricated in the factory and transported to the construction site in batches according to the construction schedule. Multiple steel sheet piles 10 are driven into the ground one by one. Multiple steel sheet piles 10 are continuously assembled into an integral waterproof curtain.

[0086] S2: After the foundation pit soil is excavated to a certain depth, the guide rail steel purlin 100 is horizontally arranged and detachably connected to the waterproof curtain. The adaptive flange device 200 is snapped onto the guide beam 102 of the guide rail steel purlin 100, and the rack 104 is provided through the side of the guide beam 102;

[0087] S3: When the flange 240 is not connected to the foundation pit steel support, the push rod 260 moves toward the foundation pit under the elastic force of the spring 251 group 250 and presses against the elastic pad 222' of the head ring 222. The brake 265 and the rack 104 are in a separated state. The connecting rod assembly 270 drives the gear assembly 230 to move toward each other, so that the moving gear 231 of the gear assembly 230 extends out of the housing 220 and meshes with the rack 104. The driver 210 drives the moving gear 231 to rotate, driving the adaptive flange device 200 to slide horizontally along the guide rail type steel purlin 100 to the steel support installation position;

[0088] The steel support is bolted to the flange 240, and the push rod 260 applies a push force to the steel support. When the push force is greater than the elastic force of the spring group 250, the length of the spring group 250 begins to be compressed, and the cylinder body 262 gradually moves toward the rear end, and pulls the gear assembly 230 away from the rack 104 through the connecting rod assembly 270, so that the moving gear 231 is separated from the rack 104. At the same time, the brake 265 at the rear end of the cylinder body 262 extends out of the middle hole of the bottom plate 227 and engages with the rack 104, so that the adaptive flange device 200 is clamped and fixed to the guide rail type steel purlin 100. When the push force reaches the set requirement, the push rod 260 is tightly pressed against the middle partition plate 225 through the spring group 250. At this time, the spring group 250 is in a fully compressed state.

[0089] This process is repeated to complete the installation of steel supports one by one;

[0090] S4: The underground structure is rebuilt, the steel supports, the adaptive flange device 200 and the guide rail type steel purlin 100 are removed, and the construction equipment 40 pulls out the steel sheet piles 10.

[0091] The construction method of the assembled steel sheet pile enclosure structure of the present invention comprises the following steps: first, a plurality of steel sheet piles 10 are driven into the ground one by one and assembled into an integral waterproof curtain; a guide rail type steel purlin 100 is horizontally arranged and detachably connected to the waterproof curtain; an adaptive flange device 200 is snapped onto the guide beam 102 of the guide rail type steel purlin 100; when the push rod 260 moves horizontally toward the foundation pit under the action of the spring group 250, the connecting rod assembly 270 drives the moving gear 231 to move toward each other, so that the moving gear 231 and the rack 10 of the guide rail type steel purlin 100 are in contact with each other. 4 are meshed, and the control system controls the driver 210 to drive the moving gear 231 to rotate, driving the adaptive flange device 200 to move horizontally along the guide beam 102 to the steel support installation position; the steel support bolt is connected to the flange plate 240 of the push rod 260, and when the push rod 260 is controlled to move away from the foundation pit, the connecting rod assembly 270 drives the moving gear 231 to move toward each other, and the moving gear 231 disengages from the rack 104 and retracts into the housing 220. At the same time, the brake 265 extends out of the housing 220 and is clamped and fixed to the rack 104 of the guide rail type steel purlin 100. The adaptive flange device 200 utilizes the gear rack 104 mechanism to automatically slide along the guide rail steel purlin 100 to the steel support installation position, and is clamped and fixed to the rack 104 through the brake 265. Construction personnel can remotely and automatically control the sliding and braking of the adaptive flange device 200, so that the flange device can adapt to the installation position of the foundation pit steel support, thereby improving the efficiency of the automated assembly operation of the enclosure structure and ensuring the safety of on-site construction operations.

[0092] The step S1 further includes:

[0093] S101: As shown in FIG20 , the construction equipment 40 of the assembled steel sheet pile enclosure structure as described in Example 2 is used to vertically lift the steel sheet pile 10, and the clamp 49 of the fixed pile clamp 46 extends outward to clamp and fasten the concave snap-in slots 11 on both sides of the steel sheet pile 10. The hydraulic device 43 lifts the mobile pile clamp 44. After the clamp 49 of the mobile pile clamp 44 extends outward to clamp and fasten the concave snap-in slots 11 on both sides of the steel sheet pile 10, the clamp 49 of the fixed pile clamp 46 is released, and the hydraulic device 43 retracts. The mobile pile clamp 44 drives the steel sheet pile 10 to descend synchronously and drive it into the soil. After the mobile pile clamp 44 descends to the bottom, the clamp 49 of the fixed pile clamp 46 extends outward again and clamps and fastens the concave snap-in slots 11 on both sides of the steel sheet pile 10. The clamp 49 of the mobile pile clamp 44 releases the steel sheet pile 10 until a concave snap-in slot 11 at the top of the steel sheet pile 10 is exposed to the ground for water blocking during construction and pulling after the structure is completed.

[0094] S102: After multiple steel sheet piles 10 are continuously driven into the ground, the positions of the slots 12 between adjacent steel sheet piles 10 correspond to each other, the cross steel 15 is embedded in two adjacent slots 12, and waterproof sealing slurry is driven into the sealing holes 14, so that the multiple steel sheet piles 10 are consolidated into an integrated waterproof curtain.

[0095] Since the steel sheet piles 10 are pre-arranged with multiple pairs of concave bayonets 11 along the length direction, the clamps 49 of the pile clamps of the construction equipment 40 can cooperate with the concave bayonets 11 of the steel sheet piles 10, so that the pile clamps clamp the vertically arranged steel sheet piles 10 and drive the steel sheet piles 10 into the soil one by one under the push of the hydraulic device 43. The pile bodies of the steel sheet piles 10 are in a good stress state during driving and are not prone to bending and deformation. Multiple pairs of concave bayonets 11 are arranged along the length direction of the steel sheet piles 10, and the layout positions and quantities of the guide rail steel purlins 100 and the steel supports can be adjusted according to the requirements of the present invention. On-site construction requires flexible adjustment and strong applicability; during pile driving construction, the leveling device 47 on the top of the construction equipment 40 is used to monitor the position and verticality of the steel sheet pile 10 in real time, and the verticality of the steel sheet pile 10 is adjusted by the pressure drop of the adjustable pressure tires 42 arranged in multiple directions, thereby ensuring the quality of pile driving construction; moreover, the piles are horizontally connected by embedding the cross steel 15 into the card slot 12, and sealing is achieved by injecting impermeable sealing slurry into the gap between the card slot 12 and the cross steel 15, thereby improving the overall water-stopping performance of the waterproof curtain.

[0096] Step S2 further includes: inserting multiple convex snap-fittings 101 on the outer side of the web of the guide beam 102 of the guide rail steel purlin 100 into multiple concave snap-fittings 11 on the horizontal direction of the waterproof curtain, so that the guide rail steel purlin 100 is snap-fitted to the waterproof curtain; fitting the C-shaped groove of the bottom plate 227 of the adaptive flange device 200 onto the T-shaped joint 103 of the guide rail steel purlin 100, and bolting the snap-fitting plate 228 to the outer side of the C-shaped groove, so that the adaptive flange device 200 is snap-fitted to the guide rail steel purlin 100. The snap-fitting connection of the guide rail steel purlin 100 to the waterproof curtain avoids welding work, facilitates assembly and disassembly, and facilitates subsequent steel support connection and layout.

[0097] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of the claims.

Claims

1. An assembled steel sheet pile enclosure structure, characterized in that: include: Waterproof curtain, which is made of multiple steel sheet piles assembled continuously around the foundation pit; The guide rail type steel purlin comprises a guide beam which is horizontally arranged and detachably connected to the waterproof curtain, and a rack which is arranged through the side of the guide beam; An adaptive flange device is detachably connected to the guide beam of the guide rail steel purlin, and comprises a shell provided with a middle partition, a push rod, a gear assembly, a connecting rod assembly, a spring assembly, a driver and a brake arranged in the shell, the push rod and the gear assembly are respectively located on both sides of the middle partition, a pair of connecting rod assemblies are symmetrically arranged on both sides of the push rod, one end of the connecting rod assembly is respectively hinged to the push rod and the shell, and the other end thereof passes through the middle partition and is connected to the end bearing of the gear assembly, and the spring assembly is arranged between the push rod and the middle partition and respectively abuts against the two; The push rod moves toward the foundation pit under the elastic force of the spring group, and the connecting rod assembly drives the gear assembly to move in the opposite direction. The moving gear of the gear assembly extends out of the housing and meshes with the rack of the guide rail steel purlin. The brake connected to one end of the push rod is separated from the rack. The driver drives the moving gear to rotate, so that the adaptive flange device slides along the guide rail steel purlin to the installation position of the foundation pit steel support. The other end of the push rod is connected to the foundation pit steel support. The push rod moves away from the foundation pit, and the connecting rod assembly drives the gear assembly to move in the opposite direction. The moving gear of the gear assembly retracts into the shell and simultaneously pushes the brake out of the shell and is clamped and fixed with the rack.

2. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The steel sheet pile is provided with a plurality of pairs of concave snap-in openings at intervals along its length direction, each pair of concave snap-in openings are symmetrically arranged along the thickness direction of the steel sheet pile and are non-through arranged on both sides of the steel sheet pile, and each concave snap-in opening is composed of interlocking concave snap-in grooves and embedded openings from outside to inside.

3. The assembled steel sheet pile enclosure structure according to claim 2 is characterized in that: The guide beam of the guide rail type steel purlin is a steel beam with a C-shaped cross section. A rack is arranged through the middle of the inner side of the web of the guide beam, and the teeth of the rack are facing the direction of the foundation pit. A plurality of convex snap-in openings are arranged at intervals along the length extension direction on the outer side of the web of the guide beam. The plurality of convex snap-in openings correspond to the positions of the concave snap-in openings in the horizontal direction of the waterproof curtain. The convex snap-in openings match the concave snap-in grooves of the steel sheet piles. The external elastic mechanical snap-in device arranged at the end of the convex snap-in opening matches the embedded opening of the steel sheet pile, so that the guide beam can be snap-connected to the waterproof curtain.

4. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The housing of the adaptive flange device comprises an outer ring shell, an inner ring shell, a bottom plate, a middle partition plate, a limit plate and a head ring. Both the outer ring shell and the inner ring shell are hollow cylindrical structures. The head ring is embedded in one end of the outer ring shell, and two outer ring hinges are symmetrically arranged at the other end of the outer ring shell along the axis of the housing. One end of the connecting rod assembly is hingedly connected to the outer ring hinge. One end of the inner ring shell is connected to the outer ring shell, and the other end is connected to the bottom plate. The middle partition plate is vertically arranged in the middle of the inner ring shell cavity, and a hole is opened in the middle of the bottom plate. The moving gear and the brake can pass through the hole in sequence under the push of the push rod; the two wing plate ends of the guide beam are respectively A T-joint is connected to be set through, a pair of C-grooves and a pair of bayonet plates are symmetrically arranged on the outer side of the bottom plate, the T-joint is tightly embedded in the notch of the C-groove, and the bayonet plate with an L-shaped cross-section is bolted to the outer end of the C-groove and clamps the T-joint, so that the adaptive flange device can be snap-connected to the guide rail type steel purlin, a pair of limit plates are horizontally and symmetrically arranged between the middle partition plate and the bottom plate along the axis of the inner ring shell to form two limit cavities, and a pair of bearings of the gear assembly are respectively embedded in the two limit cavities; a long hole is opened in the middle of the limit plate, and the rotating shaft of the gear assembly passes through the long hole and can slide along the long hole.

5. The assembled steel sheet pile enclosure structure according to claim 4 is characterized in that: The gear assembly includes a rotating shaft, a moving gear, a bearing, a sliding ring and a sliding ring hinge. The moving gear is fixed to the middle of the rotating shaft, and the moving gear is meshed with the motor gear of the driver. A pair of bearings are respectively embedded in two limiting cavities formed by a limiting plate, a middle partition plate and a bottom plate. The two ends of the rotating shaft respectively pass through the long holes of the limiting plate and are embedded and connected with a pair of bearings, and the rotating shaft can slide along the long holes of the limiting plate, so that the gear assembly can adjust the distance between it and the rack under the action of the top thrust; the sliding ring is wrapped around the bearing and forms a whole with the bearing bottom plate and the bearing top plate located on both sides of the bearing. A sliding ring hinge is arranged on the outside of the sliding ring, and the other end of the connecting rod assembly is hingedly connected to the sliding ring.

6. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The driver includes a motor, a motor shaft and a motor gear. The motor is vertically arranged on one side of the housing. The motor, the motor shaft and the motor gear are connected in sequence. The motor gear is located in the middle of the housing and meshes with the moving gear of the gear assembly.

7. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The push rod includes a cylinder base, a cylinder body, a piston rod, a flange and a base hinge. The cylinder body is fixed to the cylinder base, which is embedded in the inner cavity of the shell and can slide horizontally along its axis. One end of the piston rod is sleeved in the inner cavity of the cylinder body and can move relative to the cylinder body. The other end of the piston rod is fixedly connected to the flange, and the flange is connected to the foundation pit steel support bolts. A pair of base hinges are symmetrically arranged on the edge of the cylinder base along the axis of the shell, and a connecting rod of the connecting rod assembly is hingedly connected to the cylinder base hinge.

8. The assembled steel sheet pile enclosure structure according to claim 5 is characterized in that: The connecting rod assembly consists of a connecting rod 1, a connecting rod 2 and a connecting rod 3 which are hingedly connected head to tail in sequence. The connecting rod 1 and the connecting rod 3 are both I-shaped rods. The two ends of the connecting rod 1 are respectively hingedly connected to the cylinder base at the bottom of the push rod and the connecting rod 2. The connecting rod 2 is an L-shaped rod. A hinge is respectively provided in the middle and at both ends of the connecting rod 2. The hinge located in the middle position is hingedly connected to the outer ring hinge fixed to the outer ring shell, and the hinges located at both ends are respectively hingedly connected to the connecting rod 1 and the connecting rod 3. The two ends of the connecting rod 3 are respectively hingedly connected to the end of the connecting rod 2 and the sliding ring hinge.

9. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The spring group is symmetrically arranged along the axis of the shell and is respectively located on both sides of the through hole of the middle partition. The spring group includes a spring rod, a spring sleeve and a spring. One end of the spring rod is connected to the middle partition, and one end of the spring sleeve is connected to the push rod. The spring sleeve is sleeved on the spring rod and can slide relative to the spring rod. The spring is sleeved on the outside of the spring rod and the spring sleeve.

10. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The brake is a plate-shaped structure, one end of which is fixed to the push rod, and the other end of which is provided with teeth matching the rack, and the teeth of the brake can mesh with the rack.

11. The assembled steel sheet pile enclosure structure according to claim 1 is characterized in that: The steel sheet pile is also symmetrically provided with a pair of slots and a pair of sealing holes on both sides along the width direction thereof, the slot cross section is V-shaped, the pointed end of the slot is located at the edge of the steel sheet pile, the other end of the slot is connected with the sealing hole, the hollowing depth of the slot and the sealing hole in the steel sheet pile is greater than the excavation depth of the foundation pit, the lower part of the hollowed part of the steel sheet pile is solid, the slots of two adjacent steel sheet piles are arranged correspondingly, and are spliced ​​by inserting the cross steels of the two adjacent steel sheet pile slots, and the sealing holes are used for driving watertight sealing slurry.

12. The construction method of the assembled steel sheet pile enclosure structure according to any one of claims 1 to 11, characterized in that: Here are the steps: S1: Prefabricate a corresponding number of steel sheet piles, rail-type steel purlins and adaptive flange devices, drive multiple steel sheet piles into the ground one by one, and assemble multiple steel sheet piles continuously into an integral waterproof curtain; S2: After the foundation pit soil is excavated to a certain depth, the guide rail steel purlin is horizontally arranged and detachably connected to the waterproof curtain, the adaptive flange device is buckled to the guide beam of the guide rail steel purlin, and the rack is set through the side of the guide beam; S3: When the flange of the push rod of the adaptive flange device is not connected to the foundation pit steel support, the push rod moves toward the foundation pit under the elastic force of the spring group, the brake and the rack are in a separated state, and the connecting rod assembly drives the gear assembly to move in the opposite direction, so that the moving gear of the gear assembly extends out of the housing and meshes with the rack, and the driver drives the moving gear to rotate, driving the adaptive flange device to slide horizontally along the guide rail steel purlin to the steel support installation position; Connect the foundation pit steel support bolts to the flange plate, move the push rod away from the foundation pit, and the connecting rod assembly drives the gear assembly to move in the opposite direction, so that the moving gear of the gear assembly is separated from the rack. At the same time, the brake extends out of the housing and meshes with the rack, so that the adaptive flange device is clamped and fixed to the guide rail steel purlin. When the push force reaches the set requirement, the push rod is pressed against the middle partition through the spring group; This process is repeated to complete the installation of foundation pit steel supports one by one; S4: Rebuild the underground structure, remove the foundation pit steel support, adaptive flange device and rail-type steel purlin, and pull out the steel sheet piles.

13. The construction method of the assembled steel sheet pile enclosure structure according to claim 12, characterized in that: The steel sheet pile is also symmetrically provided with a pair of slots and a pair of sealing holes on both sides along the width direction thereof, the slot cross section is V-shaped, the pointed end of the slot is located at the edge of the steel sheet pile, the other end of the slot is connected with the sealing hole, the hollowing depth of the slot and the sealing hole in the steel sheet pile is greater than the excavation depth of the foundation pit, the lower part of the hollowed part of the steel sheet pile is solid, the slots of two adjacent steel sheet piles are correspondingly arranged, and are spliced ​​by inserting the cross steel of the slots of the two adjacent steel sheet piles, the sealing hole is used to set the watertight sealing slurry, and the step S1 also includes: S101: Lift the steel sheet pile vertically, the clamp of the fixed pile clamp extends outward to clamp and fasten the concave snaps on both sides of the steel sheet pile, the hydraulic device lifts the mobile pile clamp, and after the clamp of the mobile pile clamp extends outward to clamp and fasten the concave snaps on both sides of the steel sheet pile, the clamp of the fixed pile clamp is released, the hydraulic device retracts, the mobile pile clamp drives the steel sheet pile to descend synchronously and drives it into the soil, after the mobile pile clamp descends to the bottom, the clamp of the fixed pile clamp extends outward again and clamps and fastens the concave snaps on both sides of the steel sheet pile, the clamp of the mobile pile clamp releases the steel sheet pile until a concave snap at the top of the steel sheet pile is exposed to the ground, which is used for water blocking during construction and pulling after the structure is completed. pull; S102: After multiple steel sheet piles are continuously driven into the ground, the positions of the slots between adjacent steel sheet piles correspond to each other, the cross steel is embedded in two adjacent slots, and a waterproof sealing slurry is driven into the sealing hole, so that the multiple steel sheet piles are consolidated into a waterproof curtain.

14. The construction method of the assembled steel sheet pile enclosure structure according to claim 12, characterized in that: The housing of the adaptive flange device comprises an outer ring shell, an inner ring shell, a bottom plate, a middle partition plate, a limit plate and a head ring. Both the outer ring shell and the inner ring shell are hollow cylindrical structures. The head ring is embedded in one end of the outer ring shell, and two outer ring hinges are symmetrically arranged at the other end of the outer ring shell along the axis of the housing. One end of the connecting rod assembly is hingedly connected to the outer ring hinge. One end of the inner ring shell is connected to the outer ring shell, and the other end is connected to the bottom plate. The middle partition plate is vertically arranged in the middle of the inner ring shell cavity, and a hole is opened in the middle of the bottom plate. The moving gear and the brake can pass through the hole in sequence under the push of the push rod; the two wing plate ends of the guide beam are respectively A through-set T-joint is connected, a pair of C-grooves and a pair of bayonet plates are symmetrically arranged on the outer side of the bottom plate, the T-joint is tightly embedded in the notch of the C-groove, the bayonet plate with an L-shaped cross-section is bolted to the outer end of the C-groove and clamps the T-joint, so that the adaptive flange device can be snap-connected to the guide rail steel purlin, a pair of limit plates are horizontally and symmetrically arranged between the middle partition plate and the bottom plate along the axis of the inner ring shell to form two limit cavities, and a pair of bearings of the gear assembly are respectively embedded in the two limit cavities; a long hole is opened in the middle of the limit plate, and the rotating shaft of the gear assembly passes through the long hole and can slide along the long hole; The step S2 also includes: embedding multiple convex snap-ins of the guide beam of the guide rail steel purlin into multiple concave snap-ins in the horizontal direction of the waterproof curtain, so that the guide rail steel purlin is snap-connected to the waterproof curtain, and the C-shaped groove of the adaptive flange device is sleeved on the T-shaped joint of the guide rail steel purlin, and the snap-in plate is bolted to the outside of the C-shaped groove, so that the adaptive flange device is snap-connected to the guide rail steel purlin.

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