Fabricated steel pipe sheet pile foundation pit supporting structure

Abstract

This invention relates to the field of foundation pit support engineering technology, specifically to a prefabricated steel pipe sheet pile foundation pit support structure. It mainly includes a pile pipe body, a first connecting part, and a second connecting part. The first connecting part is located at the end of the pile pipe body, and the second connecting part is located on the side of the pile pipe body. The design allows the connecting pipe head to be inserted into the connecting ring groove, enabling the two pile pipe bodies to be aligned without the use of positioning tools. This saves time and effort and is extremely convenient. The fixing structure firmly secures the aligned pile pipe bodies together without increasing the radial dimension, resulting in less resistance and lower power consumption during pile driving. Furthermore, it facilitates the disassembly of the two pile pipe bodies after construction, making it more practical. It also facilitates assembly work, leading to higher work efficiency and greater usability.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support engineering technology, specifically to a prefabricated steel pipe sheet pile foundation pit support structure. Background Technology

[0002] Steel pipe sheet piles are widely used in foundation pit support for building, municipal and water conservancy projects due to their high load-bearing capacity and good durability. Their structure consists of a single steel tubular unit.

[0003] The steel tubular unit has a first connection at each end, usually a flange or welded connection, for end-to-end assembly. However, the pre-installed flange increases the radial dimension of the pile, significantly increasing resistance during pile driving and consuming more power; welded connections require positioning tools for alignment, which is inconvenient.

[0004] The steel tubular unit has a second connecting part on both sides, which is mostly a tenon and mortise joint or a slot type, for assembling one side with the other side. However, the protrusion is fixed by friction after being inserted into the concave part, which has weak lateral bearing capacity and is prone to misalignment under load; the slot type requires precise alignment, which is difficult to install, and long-term stress can easily cause the slot to deform and the connection to loosen.

[0005] Meanwhile, the existing assembly method has poor sealing of gaps, which can easily lead to leakage, causing water to surge in the foundation pit, settlement of the surrounding soil, and even endangering construction safety.

[0006] Therefore, there is an urgent need to design a prefabricated steel pipe sheet pile foundation pit support structure to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a prefabricated steel pipe sheet pile foundation pit support structure to solve the problems existing in the assembly of the first and second connecting parts of the existing steel pipe sheet piles mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A prefabricated steel pipe sheet pile foundation pit support structure includes: a pile pipe body, a first connecting part and a second connecting part, wherein the first connecting part is located at the end of the pile pipe body and the second connecting part is located on the side of the pile pipe body.

[0010] Preferably, the first connecting part includes a docking ring groove and a connecting pipe head. The docking ring groove is formed on the end face of one end of the pile pipe body, and the connecting pipe head is fixedly connected to the end face of the other end of the pile pipe body. The connecting pipe head can be inserted into the inside of the docking ring groove. The pile pipe body is provided with a fixing structure for fixing the connecting pipe head inside the docking ring groove.

[0011] By adopting the above technical solution, people can align and connect the two pile pipe bodies without using positioning tools, which is time-saving, labor-saving and extremely convenient.

[0012] Preferably, the second connecting part includes an assembly tube body, an assembly sliding hole, a sealing strip, and a limiting strip. The assembly tube body is fixedly connected to one side of the pile pipe body. The assembly sliding hole is opened on the surface of the assembly tube body. The sealing strip is fixedly connected to the other side of the pile pipe body. The sealing strip can be inserted into the interior of the assembly sliding hole and can block it. The limiting strip is fixedly connected to the side of the sealing strip away from the pile pipe body. The limiting strip can be inserted into the interior of the assembly tube body and block the assembly sliding hole from the inside.

[0013] By adopting the above technical solution, the assembly sliding hole is blocked from both the inside and outside, resulting in better sealing and reducing the probability of leakage.

[0014] Preferably, the fixing structure is the welding mark at the joint surface of the two pile pipe bodies.

[0015] By adopting the above technical solution, not only can the connection and fixation between the two pile pipe bodies be achieved, but the radial dimension will not be increased, the resistance during pile driving will be smaller, and the power consumption will be lower.

[0016] Preferably, the fixing structure includes an inner perforation and an outer perforation. The inner perforation is opened on the connector head, and the outer perforation is opened on the pile pipe body. The outer perforation can be aligned with the inner perforation. A bolt is inserted inside the outer perforation. The bolt is threaded into the inner perforation. A groove is opened on the surface of the pile pipe body to accommodate the hexagonal end of the bolt.

[0017] By adopting the above technical solution, not only can the connection and fixation between the two pile pipe bodies be achieved, but the radial dimension will not be increased, the resistance during pile driving will be smaller, the power consumption will be lower, and it will be easier for people to separate the two pile pipe bodies after construction, making it more practical.

[0018] Preferably, bolts are replaced with rivets.

[0019] By adopting the above technical solution, not only can the connection and fixation between the two pile pipe bodies be achieved, but the radial dimension will not be increased, the resistance during pile driving will be smaller, the power consumption will be lower, and it will also facilitate people to carry out assembly work, resulting in higher work efficiency and greater practicality.

[0020] Preferably, one end of the assembled tube body has an assembly groove, and a C-shaped washer is filled inside the assembly groove. An assembly male bevel is formed on this end face of the assembled tube body, and an assembly convex ring is fixedly connected to the other end face of the assembled tube body. An assembly female bevel is formed on this end face of the assembled tube body. The assembly convex ring can be movably inserted into the assembly groove and squeeze the C-shaped washer. The assembly male bevel can be inserted into the assembly female bevel and achieve docking.

[0021] By adopting the above technical solution, the contact surface between the assembled pipe body on the upper pile pipe c and the assembled pipe body on the lower pile pipe d is increased, which helps to improve the sealing performance.

[0022] Preferably, the sealing strip includes a base stop, a sealing arc surface, and a base insert. The base stop is fixedly connected to the surface of the pile pipe body and is symmetrical to the assembled pipe body. The surface of the base stop away from the pile pipe body has a sealing arc surface, which can be tightly fastened to the surface of the assembled pipe body. The base insert located in the middle is fixedly connected to the inner wall of the sealing arc surface. The base insert can be inserted into the assembly sliding hole and block it. The side of the base insert away from the sealing arc surface is an arc surface, which can be flush with the inner wall of the assembled pipe body.

[0023] By adopting the above technical solution, the assembled pipe body can be reinforced, increasing the difficulty of deformation and helping to improve the sealing effect. At the same time, the interlocking action between the sealing arc surface and the surface of the assembled pipe body and the insertion action between the base insert and the assembly sliding hole can further enhance the sealing effect, resulting in an excellent sealing effect.

[0024] Preferably, the opening width of the assembly sliding hole on the outer surface of the assembly tube is greater than the opening width on the inner surface of the assembly tube, so that the base insert can fit against the inner wall of the assembly sliding hole.

[0025] By adopting the above technical solution, the contact area between the inner wall of the assembled sliding hole and the sealing arc surface can be increased, which helps to improve the sealing performance.

[0026] Preferably, the limiting strip includes a strip body and an elastic strip. Both the strip body and the elastic strip have an arc surface. The elastic strip has a convex groove. The strip body is movably inserted into the convex groove. The elastic strip is fixedly installed on the inner side of the base strip. The arc surfaces on the strip body and the elastic strip share a drive shaft under no-force conditions. A buffer part is formed at the end of the elastic strip. The elastic strip can be inserted into the assembled tube body and presses against the inner wall of the assembled tube body.

[0027] By adopting the above technical solution, the assembled sliding hole can be further sealed, resulting in a better sealing effect.

[0028] Preferably, a protruding plate is fixedly connected to the surface of the elongated body. The protruding plate extends through the opening of the U-shaped groove. A receiving groove is formed on the surface of the protruding plate. A sealing cap is bolted to the surface of the protruding plate, sealing the receiving groove. An expansion groove is formed on the inner wall of the receiving groove. Multiple fitting holes are formed on the inner wall of the receiving groove and on the elastic elongated body. The fitting holes on the elastic elongated body correspond one-to-one with the fitting holes on the inner wall of the receiving groove. A locking threaded post is embedded inside the fitting hole. The locking threaded post can only rotate. A base insert is formed on the base insert. It is provided with a threaded hole, and a locking threaded post is threadedly engaged with the threaded hole. A locking gear is fixedly sleeved on one end of the locking threaded post inside the receiving groove. A drive shaft is movably sleeved on one side of the inner wall of the receiving groove. An internal hexagonal socket is fixedly connected to the other end of the drive shaft. A positioning hole is opened on the end face of the protruding plate, and the internal hexagonal socket is slidably inserted into the positioning hole. A tool insertion hole is opened on the end face of the elastic strip, and the tool insertion hole is aligned with the positioning hole. A spiral worm gear is fixedly installed on the outside of the drive shaft, and the spiral worm gear meshes with the locking gear for transmission.

[0029] By adopting the above technical solution, when the pile body is driven into the pile, people can adjust the pressure between the elastic strip and the inner wall of the assembled pipe, thereby increasing the sealing performance and achieving a better sealing effect.

[0030] Preferably, a rectangular cavity is formed on one end face of the base baffle, and a displacement sliding hole is formed on the inner side of the base insert. The displacement sliding hole communicates with the rectangular cavity. A sliding insert is slidably inserted into the rectangular cavity. A linkage strip is fixedly connected to one surface of the sliding insert. The linkage strip is slidably inserted into the displacement sliding hole, and a water channel is formed between the two. A threaded hole is formed on the linkage strip. A filling chamber is formed between the surface of the sliding insert on one side of the linkage strip and the inner wall of the rectangular cavity. The filling chamber is filled with water-absorbing and expanding material. A positive inclined surface is formed at one end of the base baffle, and a reverse inclined surface is formed at the other end of the base baffle.

[0031] By adopting the above technical solution, when leakage occurs due to seal failure, the leaking water will enter the filling chamber through the water channel, absorb water and expand the material, and apply a thrust to the sliding strip away from the displacement hole, causing the elastic strip to deform further, increasing the sealing effect and making the sealing effect better.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] The design of the connector head, which can be inserted into the groove of the docking ring, allows for the alignment of two pile pipe bodies without the use of positioning tools. This operation is time-saving, labor-saving, and extremely convenient. The fixing structure firmly secures the two aligned pile pipe bodies together without increasing the radial dimension, resulting in less resistance and lower power consumption during pile driving. Furthermore, it facilitates the disassembly of the two pile pipe bodies after construction, making it more practical. It also facilitates assembly work, leading to higher work efficiency and greater usability.

[0034] The sealing strips can seal the assembly sliding holes from the outside, while the limiting strips can seal them from the inside, thus blocking the assembly sliding holes from both the inside and outside, resulting in better sealing and reducing the chance of leakage. The assembly convex ring can be movably inserted into the assembly circular groove and compress the C-shaped washer, which can increase the sealing performance. The assembly male bevel can be inserted into the assembly female bevel to achieve a mating arrangement, increasing the sealing contact surface and further enhancing the sealing performance. Through the cooperation of the base retaining strip, sealing arc surface, and base strips, the assembly... The reinforcement of the tube body increases the difficulty of deformation of the assembled tube body, which helps to further enhance the sealing effect. At the same time, the interlocking action between the sealing arc surface and the surface of the assembled tube body, as well as the insertion action between the base insert and the assembly sliding hole, can enhance the sealing effect. By setting the opening width of the assembly sliding hole on the outer surface of the assembled tube body to be greater than its opening width on the inner surface of the assembled tube body, the contact area between the inner wall of the assembly sliding hole and the sealing arc surface can be increased, which helps to enhance the sealing performance. The elastic strip can further seal the assembly sliding hole, resulting in an excellent sealing effect.

[0035] By using a limiting strip, the pressure between the elastic strip and the inner wall of the assembled pipe can be adjusted after the pile body is driven into place, thereby increasing the sealing performance. Through the cooperation of rectangular cavity, displacement sliding hole, sliding insert, linkage strip, filling chamber, and water-absorbing and swelling material, when leakage occurs due to seal failure, the leaking water will enter the filling chamber through the waterway. The water-absorbing and swelling material absorbs water and expands, applying a thrust away from the displacement sliding hole to the sliding insert, causing the elastic strip to deform further, further increasing the sealing effect. This is to deal with leakage caused by random deformation under external force, and the sealing effect is excellent. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0037] Figure 2 For the present invention Figure 1 A schematic diagram of the three-dimensional structure at one end;

[0038] Figure 3 For the present invention Figure 1 A schematic diagram of the three-dimensional structure at the other end;

[0039] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0040] Figure 5 For the present invention Figure 1 A schematic diagram of the three-dimensional structure assembled laterally;

[0041] Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle;

[0042] Figure 7 For the present invention Figure 1 A schematic diagram of the three-dimensional structure of the end-to-end assembly;

[0043] Figure 8 For the present invention Figure 7 Enlarged view at point C;

[0044] Figure 9 For the present invention Figure 7 Another three-dimensional structural diagram;

[0045] Figure 10 For the present invention Figure 9 Enlarged view at point D;

[0046] Figure 11 For the present invention Figure 1 A schematic diagram of the three-dimensional structure of the middle limiting strip;

[0047] Figure 12 For the present invention Figure 11 A schematic diagram of the split structure;

[0048] Figure 13 For the present invention Figure 12 A three-dimensional structural diagram of the central locking gear;

[0049] Figure 14 A three-dimensional structural diagram of the first type of pile head installed according to the present invention;

[0050] Figure 15 For the present invention Figure 14 Another three-dimensional structural diagram;

[0051] Figure 16 For the present invention Figure 15 A three-dimensional structural diagram of the first type of pile head in China;

[0052] Figure 17 This is a three-dimensional structural diagram of the second type of pile head of the present invention;

[0053] Figure 18 This is a three-dimensional structural diagram of the third type of pile head of the present invention.

[0054] In the picture:

[0055] 1. Main body of pile pipe; 1a. Left pile pipe; 1b. Right pile pipe; 1c. Upper pile pipe; 1d. Lower pile pipe;

[0056] 2. Assemble the pipe body; 201. Assemble the circular groove; 202. C-type washer; 203. Assemble the male bevel; 204. Assemble the convex ring; 205. Assemble the female bevel;

[0057] 3. Assemble the sliding holes;

[0058] 4. Sealing strip; 401. Base retaining strip; 402. Sealing arc surface; 403. Base strip; 404. Rectangular cavity; 405. Displacement sliding hole; 406. Sliding strip; 407. Linkage strip; 408. Filling chamber;

[0059] 5. Limiting strip; 501. Strip body; 502. Elastic strip; 503. T-shaped groove; 504. Buffer part; 505. Protruding plate; 506. Receiving groove; 507. Sealing cover; 508. Expanding groove; 509. Insertion hole; 510. Locking threaded post; 511. Threaded hole; 512. Locking gear; 513. Drive shaft; 514. Hexagonal socket; 515. Positioning hole; 516. Tool insertion hole; 517. Spiral worm gear;

[0060] 6. Connecting ring groove;

[0061] 7. Connect the pipe ends;

[0062] 8. Internal perforation;

[0063] 9. External perforation;

[0064] 10. Pile head; 101. Inner ring of joint; 102. Outer ring of mating; 103. First blocking block; 104. Second blocking block; 105. Inclined surface. Detailed Implementation

[0065] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0066] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0067] like Figures 1-18 As shown, this application provides a prefabricated steel pipe sheet pile foundation pit support structure, including: a pile pipe body 1, a first connecting part and a second connecting part, the first connecting part being disposed at the end of the pile pipe body 1, and the second connecting part being disposed on the side of the pile pipe body 1.

[0068] For the first embodiment, please refer to... Figure 1The first connecting part includes a docking ring groove 6 and a docking pipe head 7. The docking ring groove 6 is opened on the end face of one end of the pile pipe body 1, and the docking pipe head 7 is fixedly connected to the end face of the other end of the pile pipe body 1. The docking pipe head 7 can be inserted into the inside of the docking ring groove 6. The pile pipe body 1 is provided with a fixing structure for fixing the docking pipe head 7 inside the docking ring groove 6.

[0069] Please see Figure 1 and Figure 7 During assembly, the connecting head 7 on the upper pile pipe 1c is aligned with the mating groove 6 on the lower pile pipe 1d. Then, the upper pile pipe 1c is gradually lowered, and the connecting head 7 on the upper pile pipe 1c is inserted into the mating groove 6 on the lower pile pipe 1d. After that, the end faces of the two pile pipe bodies 1 are joined together, and then the two pile pipe bodies 1 are fixed together by a fixing structure, thereby fixing the connecting head 7 in the mating groove 6, achieving the purpose of connecting the end faces of the two pile pipe bodies 1.

[0070] In the second embodiment, the second connecting part includes an assembly tube body 2, an assembly sliding hole 3, a sealing strip 4, and a limiting strip 5. The assembly tube body 2 is fixedly connected to one side of the pile pipe body 1. The assembly sliding hole 3 is opened on the surface of the assembly tube body 2. The sealing strip 4 is fixedly connected to the other side of the pile pipe body 1. The sealing strip 4 can be inserted into the interior of the assembly sliding hole 3 and can block it. The limiting strip 5 is fixedly connected to the side of the sealing strip 4 away from the pile pipe body 1. The limiting strip 5 can be inserted into the interior of the assembly tube body 2 and block the assembly sliding hole 3 from the inside.

[0071] Please see Figure 1 , Figure 5 and Figure 6 During assembly, the sealing strip 4 and the limiting strip 5 on the left pile pipe 1a are aligned with the assembly sliding hole 3 and the assembly pipe body 2 on the right pile pipe 1b, respectively. Then, the left pile pipe 1a is moved closer to the position of the right pile pipe 1b. Next, the sealing strip 4 is inserted into the assembly sliding hole 3 to block the assembly sliding hole 3 from the outside. At the same time, the limiting strip 5 is inserted into the assembly pipe body 2 to block the assembly sliding hole 3 from the inside, thus sealing the assembly sliding hole 3.

[0072] In the third embodiment, the fixing structure is the welding mark at the joint surface of the two pile pipe bodies 1.

[0073] During assembly, welding is performed along the joint between the two pile pipe bodies 1 to achieve assembly and fixation between the two pile pipe bodies 1.

[0074] For the fourth embodiment, please refer to [link / reference]. Figure 1The fixing structure includes an inner through hole 8 and an outer through hole 9. The inner through hole 8 is opened on the connecting pipe head 7, and the outer through hole 9 is opened on the pile pipe body 1. The outer through hole 9 can be aligned with the inner through hole 8. A bolt is inserted inside the outer through hole 9. The bolt is threaded into the inner through hole 8. A groove is opened on the surface of the pile pipe body 1 to accommodate the hexagonal end of the bolt.

[0075] During assembly, the bolt is passed through the outer through hole 9 and inserted into the inner through hole 8. Then the bolt is rotated, and the bolt enters the inner through hole 8 under the action of the threaded engagement. Then the hexagonal end of the bolt is inserted into the countersunk groove, and the connecting pipe head 7 is fixed in the mating ring groove 6 to achieve the assembly purpose.

[0076] In the fifth embodiment, the bolts are replaced with rivets.

[0077] During assembly, the rivets are passed through the outer through hole 9 and the inner through hole 8. Then, the appropriate tools are used to apply force to the rivets. The rivets then deform and fix the butt joint head 7 in the mating ring groove 6, thus achieving the assembly purpose.

[0078] For the sixth embodiment, please refer to... Figure 2 , Figure 3 and Figure 7 , Figure 8 One end of the assembled tube body 2 has an assembly groove 201, and a C-shaped washer 202 is filled inside the assembly groove 201. An assembly male inclined surface 203 is provided on this end face of the assembled tube body 2. An assembly convex ring 204 is fixedly connected to the other end face of the assembled tube body 2. An assembly female inclined surface 205 is provided on this end face of the assembled tube body 2. The assembly convex ring 204 can be movably inserted into the assembly groove 201 and squeeze the C-shaped washer 202. The assembly male inclined surface 203 can be inserted into the assembly female inclined surface 205 and achieve docking.

[0079] Both the male inclined plane 203 and the female inclined plane 205 have V-shaped cross sections.

[0080] When the two pile pipe bodies 1 are aligned and connected, the assembly protrusion 204 is aligned with the assembly circular groove 201, and the assembly male inclined surface 203 is aligned with the assembly female inclined surface 205. When the pile pipe bodies 1 are aligned and connected, the assembly protrusion 204 is inserted into the assembly circular groove 201 and squeezes the C-shaped washer 202. The assembly male inclined surface 203 is inserted into the assembly female inclined surface 205 and connected. The assembly male inclined surface 203 and the inner wall of the assembly female inclined surface 205 are tightly fitted. A sealing gasket can also be set between the assembly male inclined surface 203 and the inner wall of the assembly female inclined surface 205 to further increase the sealing effect.

[0081] For the seventh embodiment, please refer to... Figure 3 and Figure 4 , Figure 6The sealing strip 4 includes a base stop 401, a sealing arc surface 402, and a base insert 403. The base stop 401 is fixedly connected to the surface of the pile pipe body 1 and is symmetrical with the assembled pipe body 2. The sealing arc surface 402 is provided on the surface of the base stop 401 away from the pile pipe body 1. The sealing arc surface 402 can be tightly fastened to the surface of the assembled pipe body 2. The base insert 403 located in the middle is fixedly connected to the inner wall of the sealing arc surface 402. The base insert 403 can be inserted into the assembly sliding hole 3 and block it. The side of the base insert 403 away from the sealing arc surface 402 is an arc surface, and the arc surface can be flush with the inner wall of the assembled pipe body 2.

[0082] During assembly, the base insert 403 is inserted into the assembly sliding hole 3 to block the assembly sliding hole 3 and increase the sealing performance. At the same time, the sealing arc surface 402 is fastened to the surface of the assembly tube 2 near the assembly sliding hole 3. The contact between the sealing arc surface 402 and the surface of the assembly tube 2 can increase the sealing performance. The fastening force applied by the sealing arc surface 402 to the assembly tube 2 increases the difficulty of deformation of the assembly tube 2, so that the opening width of the assembly sliding hole 3 is fixed, which helps to further increase the sealing performance and reduce the probability of leakage.

[0083] Eighth embodiment, please refer to Figure 6 The width of the opening of the assembly sliding hole 3 on the outer surface of the assembly tube 2 is greater than the width of the opening on the inner surface of the assembly tube 2, so that the base insert 403 can fit against the inner wall of the assembly sliding hole 3.

[0084] An elastic pad can be attached to the surface of the base insert 403. The elastic pad is located between the surface of the base insert 403 and the inner wall of the assembly sliding hole 3, which helps to further increase the sealing performance.

[0085] Ninth embodiment, please refer to Figure 4 and Figure 12 The limiting strip 5 includes a strip body 501 and an elastic strip 502. Both the strip body 501 and the elastic strip 502 have an arc surface. The elastic strip 502 has a convex groove 503. The strip body 501 is movably inserted into the convex groove 503. The elastic strip 502 is fixedly installed on the inner side of the base insert 403. The arc surfaces on the strip body 501 and the elastic strip 502 share a common central axis under no-force conditions. A buffer part 504 is formed at the end of the elastic strip 502. The elastic strip 502 can be inserted into the assembly tube 2 and presses against the inner wall of the assembly tube 2.

[0086] During assembly, as the limiting strip 5 is inserted into the assembly tube 2, the elastic strip 502 presses against the inner wall of the assembly tube 2 under its own elastic force. After the limiting strip 5 is installed in place, the elastic strip 502 blocks the assembly sliding hole 3 from the inside of the assembly tube 2, resulting in a better sealing effect.

[0087] After the two pile pipe bodies 1 are connected, the buffer parts 504 at the ends of the corresponding two elastic strips 502 are connected and compressed, which plays a sealing role.

[0088] For the tenth embodiment, please refer to [link / reference]. Figure 4 , Figure 11 and Figure 12 , Figure 13 A protruding plate 505 is fixedly connected to the surface of the elongated body 501. The protruding plate 505 protrudes from the opening of the U-shaped groove 503. A receiving groove 506 is formed on the surface of the protruding plate 505. A sealing cap 507 is bolted to the surface of the protruding plate 505, sealing the receiving groove 506. An expansion groove 508 is formed on the inner wall of the receiving groove 506. Multiple fitting holes 509 are formed on the inner wall of the receiving groove 506 and on the elastic elongated body 502. The fitting holes 509 on the elastic elongated body 502 correspond one-to-one with the fitting holes 509 on the inner wall of the receiving groove 506. A locking threaded post 510 is embedded in the fitting hole 509. The locking threaded post 510 can only rotate. A base insert 403 is formed on the base insert 403. A threaded hole 511 is provided, and a locking threaded post 510 is threadedly engaged with the threaded hole 511. A locking gear 512 is fixedly sleeved at one end of the locking threaded post 510 located inside the receiving groove 506. A drive shaft 513 is movably sleeved on one side of the inner wall of the receiving groove 506. An internal hexagonal sleeve 514 is fixedly connected to the other end of the drive shaft 513. A positioning hole 515 is provided on the end face of the protruding plate 505. The internal hexagonal sleeve 514 is slidably inserted into the positioning hole 515. A tool insertion hole 516 is provided on the end face of the elastic strip 502. The tool insertion hole 516 is aligned with the positioning hole 515. A spiral worm gear 517 is fixedly installed on the outside of the drive shaft 513. The spiral worm gear 517 meshes with the locking gear 512 for transmission.

[0089] During operation, a tool is inserted through the tool socket 516 and into the internal hexagon socket 514. Then, the internal hexagon socket 514 is rotated, which in turn drives the spiral worm gear 517 to rotate via the drive shaft 513. The spiral worm gear 517 then drives the locking threaded post 510 to rotate through its meshing with the locking gear 512. The locking threaded post 510 then moves into the threaded hole 511 under the action of the threaded engagement. The locking threaded post 510 then applies pressure to the long strip body 501 toward the assembly sliding hole 3. The long strip body 501 then applies pressure to the elastic strip 502, pressing the elastic strip 502 against the inner wall of the assembly tube body 2 to increase the sealing performance and increase the lateral bearing capacity, thereby increasing the deformation resistance.

[0090] Eleventh embodiment, please refer to Figure 2 , Figure 4 , Figure 10 , Figure 11 and Figure 12A rectangular cavity 404 is formed on one end face of the base baffle 401. A displacement sliding hole 405 is formed on the inner side of the base insert 403. The displacement sliding hole 405 communicates with the rectangular cavity 404. A sliding insert 406 is slidably inserted into the rectangular cavity 404. A linkage strip 407 is fixedly connected to one surface of the sliding insert 406. The linkage strip 407 is slidably inserted into the displacement sliding hole 405, and a water channel is formed between the two. A threaded hole 511 is formed on the linkage strip 407. A filling chamber 408 is formed between the surface of the sliding insert 406 on one side of the linkage strip 407 and the inner wall of the rectangular cavity 404. The filling chamber 408 is filled with water-absorbing and expanding material. A positive inclined surface is formed at one end of the base baffle 401, and a reverse inclined surface is formed at the other end of the base baffle 401.

[0091] The water-absorbing and swelling material can be any one of superabsorbent polymer, expanded clay, or expanded rubber.

[0092] When the pile pipe body 1 is successfully aligned, the positive inclined surface of one end of the foundation retainer 401 fits together with the negative inclined surface of the other end of the foundation retainer 401 to achieve a sealing effect. A sealing gasket can be placed between the positive and negative inclined surfaces to increase the sealing effect.

[0093] During operation, the main body 1 of the pile pipe undergoes slight deformation due to external forces, resulting in reduced fit between the sealing arc surface 402 and the surface of the assembled pipe body 2, between the foundation insert 403 and the inner wall of the assembled sliding hole 3, and between the foundation insert 403 and the elastic strip 502, causing leakage. The leaked water enters the filling chamber 408 through the gaps between the sealing arc surface 402 and the assembled pipe body 2, the gaps between the foundation insert 403 and the inner wall of the assembled sliding hole 3, the gaps between the foundation insert 403 and the elastic strip 502, and the water channel. Then, it absorbs water and expands, and applies a thrust to the sliding insert 406 away from the displacement sliding hole 405, causing the elastic strip 502 to deform further, increasing the sealing effect. The sealing effect is better, and at the same time, the lateral bearing capacity is greater and the deformation resistance is greater.

[0094] For the twelfth embodiment, please refer to... Figure 14-16 One end of the pile pipe body 1 is equipped with a pile head 10. The pile head 10 includes a joint inner ring 101, which is inserted into the docking ring groove 6 and fixed by a fixing structure. The end of the joint inner ring 101 is connected to a docking outer ring 102. A first shielding block 103 and a second shielding block 104 are symmetrically installed on the side of the docking outer ring 102. Inclined strips 105 are connected to the first shielding block 103 and the second shielding block 104. The first shielding block 103 corresponds to the assembled pipe body 2 and is used to separate the soil in the forward direction of the assembled pipe body 2 to prevent soil from entering the assembled pipe body 2. The second shielding block 104 corresponds to the limiting strip 5 and is used to protect the limiting strip 5 so that the limiting strip 5 will not directly rub against the soil, reducing friction loss. It is suitable for the settlement installation of the first pile pipe body 1.

[0095] The soil layers are separated to both sides by the slope on the inclined plane 105.

[0096] Please see Figure 17 Only the first shielding block 103 and the inclined plate 105 are installed on the outer ring 102. The first shielding block 103 corresponds to the assembled pipe body 2 and is used to separate the soil in the forward direction of the assembled pipe body 2 to prevent soil from entering the assembled pipe body 2. It is suitable for the pile pipe body 1 installed on the side of the first pile pipe body 1. At this time, the limiting strip 5 on the subsequently installed pile pipe body 1 is inserted into the assembled pipe body 2 on the priority installed pile pipe body 1.

[0097] Please see Figure 18 Only the second shielding block 104 and the inclined plate 105 are installed on the outer ring 102 to protect the limiting strip 5, so that the limiting strip 5 will not directly rub against the soil, reducing friction loss. This is suitable for the pile pipe body 1 installed on the side of the first pile pipe body 1. At this time, the assembled pipe body 2 on the subsequently installed pile pipe body 1 is sleeved on the limiting strip 5 on the priority pile pipe body 1.

[0098] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0099] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A prefabricated steel pipe sheet pile foundation pit support structure, comprising: The pile pipe body (1), the first connecting part and the second connecting part are characterized in that the first connecting part is disposed at the end of the pile pipe body (1) and the second connecting part is disposed on the side of the pile pipe body (1); The first connecting part includes a docking ring groove (6) and a docking pipe head (7). The docking ring groove (6) is opened on the end face of one end of the pile pipe body (1). The docking pipe head (7) is fixedly connected to the end face of the other end of the pile pipe body (1). The docking pipe head (7) is inserted into the inside of the docking ring groove (6). The pile pipe body (1) is provided with a fixing structure for fixing the docking pipe head (7) inside the docking ring groove (6). The second connecting part includes an assembly tube body (2), an assembly sliding hole (3), a sealing strip (4), and a limiting strip (5). The assembly tube body (2) is fixedly connected to one side of the pile pipe body (1). The assembly sliding hole (3) is opened on the surface of the assembly tube body (2). The sealing strip (4) is fixedly connected to the other side of the pile pipe body (1). The sealing strip (4) is inserted into the interior of the assembly sliding hole (3) and can block it. The limiting strip (5) is fixedly connected to the side of the sealing strip (4) away from the pile pipe body (1). The limiting strip (5) is inserted into the interior of the assembly tube body (2) and blocks the assembly sliding hole (3) from the inside. The limiting strip (5) includes a strip body (501) and an elastic strip (502). Both the strip body (501) and the elastic strip (502) have an arc surface. The elastic strip (502) has a convex groove (503). The strip body (501) is movably inserted into the convex groove (503). The elastic strip (502) is fixedly installed on the inner side of the base strip (403) in the sealing strip (4). The arc surfaces on the strip body (501) and the elastic strip (502) share a drive shaft under no-force conditions. A buffer part (504) is formed at the end of the elastic strip (502). The elastic strip (502) is inserted into the assembly tube (2). The elastic strip (502) presses against the inner wall of the assembly tube (2). A protruding plate (505) is fixedly connected to the surface of the elongated body (501). The protruding plate (505) protrudes through the opening of the U-shaped groove (503). A receiving groove (506) is formed on the surface of the protruding plate (505). A sealing cap (507) is bolted to the surface of the protruding plate (505). The sealing cap (507) seals the receiving groove (506). An expansion groove (508) is formed on the inner wall of the receiving groove (506). A plurality of fitting holes (509) are formed on the inner wall of the receiving groove (506) and on the elastic elongated body (502). The fitting holes (509) on the elastic elongated body (502) correspond one-to-one with the fitting holes (509) on the inner wall of the receiving groove (506). A locking threaded post (510) is embedded in the fitting hole (509). The locking threaded post (510) only rotates. A base insert (403) is formed on the base insert (403). The device has a threaded hole (511), and the locking threaded post (510) is threadedly engaged with the threaded hole (511). One end of the locking threaded post (510) located inside the receiving groove (506) is fixedly sleeved with a locking gear (512). A drive shaft (513) is movably sleeved on one side of the inner wall of the receiving groove (506). The other end of the drive shaft (513) is fixedly connected with an internal hexagonal sleeve (514). A positioning hole (515) is opened on the end face of the protruding plate (505), and the internal hexagonal sleeve (514) is slidably inserted into the positioning hole (515). A tool insertion hole (516) is opened on the end face of the elastic strip (502), and the tool insertion hole (516) is aligned with the positioning hole (515). A spiral worm gear (517) is fixedly installed on the outside of the drive shaft (513), and the spiral worm gear (517) meshes with the locking gear (512) for transmission.

2. The prefabricated steel pipe sheet pile foundation pit support structure according to claim 1, characterized in that, The fixing structure is the welding marks at the joint surfaces of the two pile pipe bodies (1) at their ends.

3. The prefabricated steel pipe sheet pile foundation pit support structure according to claim 1, characterized in that, The fixing structure includes an inner through hole (8) and an outer through hole (9). The inner through hole (8) is opened on the connecting pipe head (7), and the outer through hole (9) is opened on the pile pipe body (1). The outer through hole (9) and the inner through hole (8) are aligned. A bolt is inserted inside the outer through hole (9). The bolt is threaded into the inner through hole (8). A groove is opened on the surface of the pile pipe body (1). The groove is used to accommodate the hexagonal end of the bolt.

4. The prefabricated steel pipe sheet pile foundation pit support structure according to claim 3, characterized in that, Replace the bolts with rivets.

5. A prefabricated steel pipe sheet pile foundation pit support structure according to any one of claims 2-4, characterized in that, One end of the assembled tube (2) is provided with an assembly groove (201), and a C-shaped washer (202) is filled inside the assembly groove (201). An assembly male inclined surface (203) is provided on this end face of the assembled tube (2). An assembly convex ring (204) is fixedly connected to the other end face of the assembled tube (2). An assembly female inclined surface (205) is provided on this end face of the assembled tube (2). The assembly convex ring (204) is movably inserted into the assembly groove (201) and squeezes the C-shaped washer (202). The assembly male inclined surface (203) is inserted into the assembly female inclined surface (205) and achieves docking.

6. The prefabricated steel pipe sheet pile foundation pit support structure according to claim 5, characterized in that, The sealing strip (4) includes a base baffle (401), a sealing arc surface (402), and a base strip (403). The base baffle (401) is fixedly connected to the surface of the pile pipe body (1) and is symmetrical to the assembled pipe body (2). The sealing arc surface (402) is provided on the surface of the base baffle (401) away from the pile pipe body (1). The sealing arc surface (402) is tightly fastened to the surface of the assembled pipe body (2). The base strip (403) located in the middle is fixedly connected to the inner wall of the sealing arc surface (402). The base strip (403) is inserted into the assembly sliding hole (3) and blocks it. The side of the base strip (403) away from the sealing arc surface (402) is an arc surface. The arc surface is flush with the inner wall of the assembled pipe body (2).

7. A prefabricated steel pipe sheet pile foundation pit support structure according to claim 6, characterized in that, The width of the opening of the assembly sliding hole (3) on the outer surface of the assembly tube (2) is greater than the width of the opening on the inner surface of the assembly tube (2), and the base insert (403) can fit against the inner wall of the assembly sliding hole (3).

8. A prefabricated steel pipe sheet pile foundation pit support structure according to claim 7, characterized in that, A rectangular cavity (404) is formed on one end face of the base retaining strip (401), and a displacement sliding hole (405) is formed on the inner side of the base insert (403). The displacement sliding hole (405) communicates with the rectangular cavity (404). A sliding insert (406) is slidably inserted into the rectangular cavity (404). A linkage strip (407) is fixedly connected to one surface of the sliding insert (406), and the linkage strip (407) is slidably inserted into the displacement sliding hole (404). 5) A water channel is formed inside and between the two. The threaded hole (511) is opened on the linkage strip (407). The sliding insert (406) forms a filling chamber (408) between the surface of the linkage strip (407) on one side and the inner wall of the rectangular cavity (404). The filling chamber (408) is filled with water-absorbing and swelling material. One end of the base baffle (401) is provided with a positive inclined surface, and the other end of the base baffle (401) is provided with a reverse inclined surface.

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