A foundation pit telescopic sheet pile bracing enclosure and a construction method thereof

Abstract

This invention discloses a telescopic sheet pile support structure for foundation pits and its construction method, relating to the field of foundation pit support. It includes steel piles, square tubes and telescopic pipes, a protective structure, and a connecting structure. Retaining plates are slidably installed between adjacent steel piles. The telescopic pipes slide inside the square tubes, with the square tubes and telescopic pipes positioned between opposing steel piles. The protective structure is located on top of the square tubes, and the connecting structure is located on the protective structure. This invention utilizes a combination of protective covers, movable covers, support columns, and rubber plates. Two sets of protective structures can be prepared. The protective covers and movable covers are positioned on top of the square tubes and telescopic pipes, effectively shielding and protecting the tops of the square tubes and telescopic pipes, preventing direct contact between soil or concrete and the tops. It also adapts to square tubes and telescopic pipes of different lengths. Furthermore, when one set of protective covers is removed for washing, another set can be installed, allowing the square tubes and telescopic pipes to continue supporting operations.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support, and in particular to a foundation pit expansion sheet pile support structure and its construction method. Background Technology

[0002] A foundation pit is a pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. When constructing rainwater and sewage pipes, foundation pits are usually excavated. In order to prevent the foundation pit from collapsing, a type of foundation pit expansion sheet pile support structure is usually used to maintain and support the foundation pit internally.

[0003] A typical existing excavation pit expansion sheet pile support structure includes steel pipe piles, retaining plates, and expansion sheet pile support components. The steel pipe piles are inserted into the interior of the excavation pit, and two or more rows are arranged along the interior of the pit. The retaining plates are slidably installed between adjacent steel pipe piles in the same row to shield the soil on the inner wall of the excavation pit. The expansion sheet pile support components are placed between opposite steel pipe piles to support and protect the two opposite steel pipe piles.

[0004] Expansion sheet pile support assemblies typically include square tubes and telescopic tubes. The telescopic tubes are slidably fixed inside the square tubes, thus supporting two opposing steel pipe piles. However, expansion sheet pile support assemblies are usually placed directly inside the foundation pit, and the top is often not easily protected against falling soil or concrete. As a result, during pipeline laying, soil or concrete may fall directly onto the top of the expansion sheet pile support assembly, causing it to adhere directly to the top of the assembly after drying, making cleaning difficult and subsequent use inconvenient. Therefore, it is necessary to use a foundation pit expansion sheet pile support retaining structure that can protect the top of the expansion sheet pile support assembly from pollution. Summary of the Invention

[0005] The purpose of this invention is to provide a foundation pit expansion joint sheet pile support structure and its construction method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a foundation pit expansion joint sheet pile retaining structure, comprising: Steel piles, with retaining plates slidably installed between adjacent steel piles; A square tube and a telescopic tube, wherein the telescopic tube slides inside the square tube, and the square tube and the telescopic tube are placed between opposing steel piles; A protective structure is located at the top of the square tube and is used to shield and protect the top of the square tube and the telescopic tube. A connecting structure is located on the protective structure and is used to fix or separate the protective structure from the square tube.

[0007] Preferred options also include: The bracket is fixed to the outside of the steel pile, and the end of the square tube near the steel pile is located between adjacent brackets; The first pin slides through the adjacent bracket and the square tube; The second pin slides through the square tube and the telescopic tube; A lead screw, which is threadedly connected to the end of the telescopic tube opposite to the square tube; A nut, the nut being threaded onto the outside of a lead screw; An arc-shaped frame is installed at the end of the lead screw away from the telescopic tube; A storage structure is provided at the bottom of the square tube, and the storage structure is used to store the first pin, the second pin, and other tools.

[0008] Preferably, the protective structure includes: A protective cover is provided on the top of the square tube; The lower pressure frame is fixed to the top of the inner wall of the protective cover, and the bottom of the lower pressure frame is attached to the top of the first pin. A movable cover is provided on top of the telescopic tube, and the movable cover slides inside the protective cover; A support column, which is fixed to the top of the movable cover and slidably connected to the inside of the protective cover; The docking component includes: A docking frame, which is fixed to the top of the inner wall of the movable cover; A connecting part, the connecting part being located on the side of the mating frame; A limiting part is located on the side of the connecting part, the limiting part is slidably sleeved on the outside of the lead screw, and the limiting part is in contact with the side of the nut; An assembly column is fixed to the top of the telescopic tube and is slidably connected to the inside of the docking frame. A support member located inside the movable cover and used to support the movable cover.

[0009] Preferably, the protective structure further includes: A guide frame, which is fixed to the outside of the protective cover; A sliding plate, which is fixed to the outside of the movable cover and slidably connected to the inside of the guide frame; Indicator ruler, which is embedded in the side of the sliding plate away from the movable cover; A guide rail, which is fixed to the top of the square tube; A rubber sheet, which is fixed to the end of the movable cover near the steel pile; The first support plate is fixed to the top of the movable cover; The second support plate is fixed to the top of the protective cover, and the first and second support plates are used to support the removed protective cover.

[0010] Preferably, the support member includes: The support portion slides inside the guide rail; The support portion is located on the side of the support portion; An extension frame is located on the side of the support portion, and a shielding portion is fixed to the side of the extension frame. The shielding portion is located on the side of the square tube and close to the end of the second pin. The docking parts are located on top of the support and the extension frame, respectively, and the top of the docking parts is fixed to the top of the inner wall of the movable cover; A roller is rotatably connected to the bottom of the support.

[0011] Preferably, the connection structure includes: An assembly frame, which is fixed to the top of the inner wall of the protective cover; The plug-in post is fixed to the top of the square tube, and the bottom of the assembly frame is provided with a first sliding groove that is adapted to the plug-in post. Positioning element, the positioning element comprising: The support body slides between the assembly frame and the lower pressure frame, and the top of the protective cover is provided with a second sliding groove that is adapted to the support body; The locking part is located on the side of the support body and slides on the side of the assembly frame. The side of the plug-in post is provided with a positioning groove that matches the locking part. The frame is fixed to the top of the support.

[0012] Preferably, the connection structure further includes: A fixing rod is fixed between the lower pressure frame and the assembly frame, and the outer wall of the fixing rod is slidably connected to the support body; The first spring is sleeved on the outside of the fixed rod, and its two ends are fixed to the lower pressure frame and the support body, respectively. An extension frame is fixed to the top of the protective cover and located inside the frame.

[0013] Preferably, the storage structure includes: A storage frame, the storage frame being located at the bottom of the square tube; A cover plate, located on top of the storage frame; The support member includes: The lead-out part is fixed to the side of the plug-in post, and the side of the assembly frame is provided with a slot that matches the lead-out part. The support portion is located at the bottom of the lead-out portion; A support frame is fixed to the outside of the square tube, and the storage frame is located between the load-bearing part and the support frame; The mounting plate is fixed to the side of the storage frame, and the supporting part and the support frame are each provided with a sliding groove that is adapted to the mounting plate.

[0014] Preferably, the storage structure further includes: Locking element, the locking element comprising: A sliding body is located at the bottom of the storage frame, and the bearing part and the support frame are provided with grooves on opposite sides that are adapted to the end of the sliding body; A protective part is located at the bottom of the sliding body and is used to shield and protect the interior of the groove; The snap-fit ​​part is fixed to the top of the sliding body, the snap-fit ​​part is slidably inserted into the top of the groove and one end extends into the interior of the sliding groove, and the bottom of the mounting plate is provided with a snap-fit ​​groove that matches the snap-fit ​​part. The traction part is located at the top of the sliding body, and the top of the inner wall of the groove is provided with a circular groove that is adapted to the traction part. The pressing part is located at the end of the traction part away from the sliding body; The second spring is sleeved on the outside of the traction part; A guide ring is fixed inside a circular groove. The traction part is slidably connected to the inside of the guide ring. The two ends of the second spring are respectively fixed to the pressing part and the guide ring.

[0015] A construction method for a foundation pit expansion sheet pile support structure, applied to a foundation pit expansion sheet pile support structure, includes the following specific steps: Step 1: When it is necessary to construct retaining walls after the foundation pit excavation is completed, hoist the steel piles into the foundation pit. Then, according to the measured position, insert the steel piles into the corresponding positions at the bottom of the foundation pit. After the construction of multiple steel piles is completed, hoist the retaining plate to the foundation pit and place it between adjacent steel piles. Then, slide the retaining plate to connect with the steel piles and lower the retaining plate into the foundation pit. The retaining plate then protects the inner wall of the foundation pit by retaining soil. After the square tube and telescopic tube are pre-adjusted to their working length and the position of the arc frame through the second pin, hoist them between the corresponding steel piles. Then, place the end of the square tube on the adjacent support and make the first pin pass through the support and the square tube. Then, the arc frame abuts against the outside of the corresponding steel pile, thereby supporting the corresponding steel pile. Step Two: Next, bring the protective cover to the top of the square tube and slide the movable cover inside the protective cover, aligning the lengths of the movable cover and the protective cover with the positions of the square tube and the telescopic tube. Connect the assembly frame to the insertion post, and the mating frame to the assembly post. The limiting part limits the side of the nut, the blocking part limits the end of the second pin, and the pressing frame limits the top of the first pin. As the assembly frame moves downward, the locking part first presses against the top of the insertion post to push the locking part to slide horizontally, then pushes the support body to move. The support body compresses the first spring, and the first spring generates elastic force on the support body. As the assembly frame continues to move downward, when the locking part corresponds to the inside of the positioning groove, the elastic force of the first spring pushes the support body to drive the locking part to insert into the inside of the positioning groove, so that the protective cover and the square tube are aligned. The protective cover and the movable cover are fixed to shield and protect the top of the square tube and the telescopic tube. When it is necessary to lower the pipe into the pit, the frame is first pushed to slide horizontally. The frame drives the support body to move, and then the support body drives the locking part to disengage from the plug-in column. At this time, the position restriction of the assembly frame is released. Then the protective cover and the movable cover are lifted and separated. Then one of the first pins is detached upwards. Then the square tube is rotated in a circle with the other first pin as the center, so that the square tube and the telescopic tube are moved away from the relative steel piles. Then the pipe is lowered to the top of the lower square tube and the telescopic tube. The upper square tube and the telescopic tube are rotated back to the original position to continue to support the steel piles. Then the lower square tube is moved away from the relative steel piles in the same way, and the pipe continues to fall. Step 3: During the pre-adjustment of the square tube and telescopic tube, pull the sliding body downward to move it. The sliding body moves the locking part downward, thereby disengaging the locking part from the mounting plate. At this time, the position restriction of the mounting plate is released. Then, slide the storage frame between the bearing part and the support frame to remove the storage frame. Then, remove the cover plate to take out the first and second pins for use.

[0016] The technical effects and advantages of this invention are as follows: (1) The present invention utilizes a combination of protective cover, movable cover, support column, rubber plate, guide frame, sliding plate, first support plate and second support plate to prepare two sets of protective structures. The protective cover and movable cover are placed on the top of the square tube and telescopic tube. The sliding plate and guide frame allow the movable cover to slide inside the protective cover, which is beneficial for shielding and protecting the top of the square tube and telescopic tube, preventing soil or concrete from directly contacting the top of the square tube and telescopic tube. It is also beneficial for adapting to square tubes and telescopic tubes of different lengths. When one set of protective cover is removed and washed, another set of protective cover is installed so that the square tube and telescopic tube can continue to be supported without having to clean the square tube and telescopic tube separately in the pit. In addition, the first support plate and the second support plate are beneficial for supporting the protective cover and movable cover separated from the square tube. (2) By utilizing the combination of protective cover, pressure frame, support and docking parts, the protective cover is fixed to the square tube. The combination of pressure frame, support and docking parts provides synchronous limiting protection for the first pin, second pin and nut. This helps to protect the first pin, second pin and nut from movement while shielding the top of the square tube and telescopic tube, thereby improving the stability of the connection between the square tube and telescopic tube. (3) By utilizing the connection structure and the protective cover in combination, the assembly frame and the plug-in post are connected to each other to position the connection of the protective cover. The positioning component limits the relative position of the assembly frame and the plug-in post, which facilitates the connection and fixation or disassembly of the protective cover and the square tube, so as to quickly connect or disassemble the protective cover and the movable cover. (4) By utilizing the combination of storage structure and plug-in post, the storage frame stores the tools or accessories used for square tubes and telescopic tubes, such as the first and second pins, so that they can be carried and operated together with the square tubes and telescopic tubes. The carrier and support frame extended from the plug-in post are conducive to positioning the storage frame during installation. The locking component locks the storage frame, which in turn facilitates the synchronous use of the first and second pins and other tools with the square tubes and telescopic tubes. When operating the square tubes and telescopic tubes, the first and second pins can be directly taken out and used from inside the storage frame on them, which can prevent loss and provide storage protection. In addition, the carrier and support frame can directly support the bottom of the removed square tubes and telescopic tubes to prevent them from being contaminated when placed directly on the ground. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the protective cover of the present invention; Figure 3 This is a schematic diagram of the structure of the sliding plate of the present invention; Figure 4 This is a schematic diagram of the front cross-sectional structure of the protective cover of the present invention; Figure 5 This is a schematic diagram of the front cross-sectional structure of the storage frame of the present invention; Figure 6 This is a front cross-sectional view of the guide rail structure of the present invention; Figure 7 This is a schematic diagram of the structure of the support component of the present invention; Figure 8 This is a schematic diagram of the front cross-sectional structure of the docking frame of the present invention; Figure 9 This is a schematic diagram of the structure at the docking point of the present invention; Figure 10 This is a front cross-sectional view of the assembly frame of the present invention; Figure 11 This is a schematic diagram of the front structure of the mounting plate of the present invention; Figure 12 This is a schematic diagram of the front cross-sectional structure of the mounting plate of the present invention; Figure 13 This is a schematic diagram of the structure of the carrier component of the present invention.

[0018] In the diagram: 1. Steel pile; 11. Retaining plate; 12. Square tube; 13. Telescopic tube; 14. Support; 15. First pin; 16. Second pin; 17. Screw rod; 18. Nut; 19. Arc frame; 2. Protective structure; 21. Protective cover; 22. Lower pressure frame; 23. Moving cover; 24. Support column; 25. Guide frame; 26. Sliding plate; 261. Indicator ruler; 27. Connecting part; 271. Connecting frame; 272. Connecting part; 273. Limiting part; 274. Assembly column; 28. Supporting part; 281. Supporting part; 282. Supporting part; 283. Extension frame; 284. Covering part; 285. Connecting part; 286. Roller; 29. ​​Guide rail 210. Rubber sheet; 211. First support plate; 212. Second support plate; 3. Connecting structure; 31. Assembly frame; 32. Insertion post; 33. Positioning component; 331. Support body; 332. Locking part; 333. Frame; 34. Fixing rod; 35. First spring; 36. Extension frame; 4. Storage structure; 41. Storage frame; 42. Cover plate; 43. Bearing component; 431. Lead-out part; 432. Bearing part; 44. Support frame; 45. Mounting plate; 46. Locking component; 461. Sliding body; 462. Protective part; 463. Snap-fit ​​part; 464. Traction part; 465. Pressing part; 47. Second spring; 48. Guide ring; 49. Groove. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides, for example Figures 1-13The diagram shows a sheet pile support structure for a foundation pit, comprising steel piles 1, square tubes 12, telescopic pipes 13, a protective structure 2, and a connecting structure 3. The steel piles 1 are inserted into the foundation pit. The square tubes 12 and telescopic pipes 13 provide support and protection between the opposing steel piles 1. The square tubes 12 and telescopic pipes 13 are adjustable and fixed by a second pin 16. The telescopic pipes 13 have multiple equidistant adjustment holes that mate with the second pin 16 to accommodate pipe pits of different sizes. A retaining plate 11 is slidably installed between adjacent steel piles 1. The retaining plate 11 is internally composed of a steel frame, which helps to shield the soil on the inner wall of the foundation pit. The telescopic pipes 13 slide inside the square tubes 12, and the square tubes 12 and telescopic pipes 13 are positioned between the opposing steel piles 1. The protective structure 2 is located on top of the square tubes 12 and is used to shield and protect the tops of the square tubes 12 and telescopic pipes 13. The connecting structure 3 is located on the protective structure 2 and is used to fix or separate the protective structure 2 from the square tubes 12.

[0021] Furthermore, it also includes a bracket 14, a first pin 15, a second pin 16, a screw rod 17, a nut 18, an arc-shaped frame 19, and a storage structure 4. The bracket 14 facilitates the connection between the square tube 12 and the steel pile 1, and also supports the first pin 15. Two first pins 15 engage on one square tube 12; removing one first pin 15 allows the square tube 12 to rotate around the other first pin 15. The first pin 15 helps to fix the square tube 12 and the bracket 14, and also allows the square tube 12 to rotate around its center, enabling the pipe to be lowered into the pit. The second pin 16 helps to lock the relative position of the square tube 12 and the telescopic pipe 13. The screw rod 17 supports the arc-shaped frame 19 and can also support the arc-shaped frame 19. The position of 9 is finely adjusted. Nut 18 helps to lock the lead screw 17 and the telescopic tube 13. Arc frame 19 helps to abut against the opposite steel pile 1 to support the two opposite steel piles 1. Bracket 14 is fixed to the outside of the steel pile 1. The end of square tube 12 near the steel pile 1 is located between adjacent brackets 14. First pin 15 slides through adjacent brackets 14 and square tube 12. Second pin 16 slides through square tube 12 and telescopic tube 13. Lead screw 17 is threaded to the end of telescopic tube 13 away from square tube 12. Nut 18 is threaded onto the outside of lead screw 17. Arc frame 19 is installed at the end of lead screw 17 away from telescopic tube 13. Storage structure 4 is placed at the bottom of square tube 12. Storage structure 4 is used to store the first pin 15, the second pin 16 and other tools.

[0022] Specifically, the protective structure 2 includes a protective cover 21, a lower pressure frame 22, a movable cover 23, a support column 24, a connecting piece 27, and a support member 28. The top of the protective cover 21 is arc-shaped, which helps to shield and protect the top of the square tube 12, preventing the top of the square tube 12 from being directly attached to soil or concrete. It also helps to support the movable cover 23. The lower pressure frame 22 is L-shaped and integrally set with the protective cover 21. The lower pressure frame 22 can limit and protect the top of the first pin 15, preventing the first pin 15 from detaching upwards at will. Thus, the first pin 15 can be normally slidably connected with the bracket 14 and the square tube 12. In addition, a rubber sleeve can be fitted on the outside to increase friction, so that the first pin 15 does not need to be directly connected to the bracket 14 and the square tube 12. The square tube 12 has an interference fit, which facilitates the separation of the square tube 12 from the support 14. The movable cover 23 helps to shield and protect the top of the telescopic tube 13 and the lead rod 17, preventing direct adhesion of soil or concrete. The movable cover 23 and the protective cover 21 have an internal fit to accommodate square tubes 12 and telescopic tubes 13 of different lengths. Furthermore, one set of square tube 12 and other structures can be configured with two sets of protective covers 21 and movable covers 23. This allows for simultaneous support of the square tube 12 and telescopic tube 13 against the opposing steel piles 1. If one set of protective covers 21 becomes heavily contaminated, it can be directly separated from the square tube 12 for washing, and then replaced with another set of protective covers 21 for shielding and protection. This eliminates the need for internal protection of the square tube 12 and telescopic tube 13 within the foundation pit. The shrink tube 13 is cleaned for easy operation. Furthermore, it does not affect the normal support operation of the square tube 12 and the telescopic tube 13, nor does it affect their continued use. The top of the support column 24 is arc-shaped, allowing soil to fall down its slope. The support column 24 facilitates cooperation with the protective cover 21 to support the use of the movable cover 23. The protective cover 21 is placed over the top of the square tube 12. The lower pressure frame 22 is fixed to the top of the inner wall of the protective cover 21, and the bottom of the lower pressure frame 22 is attached to the top of the first pin 15. The movable cover 23 is placed over the top of the telescopic tube 13 and slides inside the protective cover 21. The support column 24 is fixed to the top of the movable cover 23 and slidably connected to the inside of the protective cover 21. The connecting piece 27... The assembly includes a docking frame 271, a connecting part 272, a limiting part 273, and an assembly column 274. The docking frame 271 facilitates vertical connection with the assembly column 274, thereby enabling the movable cover 23 to be directly and vertically positioned and installed with the telescopic tube 13, while preventing the movable cover 23 from sliding horizontally at will. The connecting part 272 facilitates connection between the docking frame 271 and the limiting part 273, providing support for the limiting part 273. The bottom of the limiting part 273 has a U-shaped opening, allowing it to be fitted onto the outside of the lead screw 17. The limiting part 273 provides lateral limiting protection for the nut 18 that fits against the telescopic tube 13, preventing the nut 18 from rotating freely and improving the stability of the lead screw 17. The assembly column 274 facilitates connection with the docking frame 271.To facilitate the positioning of the movable cover 23 within the protective cover 21, the usable lengths of the protective cover 21 and the movable cover 23 are directly determined and correspond to the square tube 12 and the telescopic tube 13. The mating frame 271 is fixed to the top of the inner wall of the movable cover 23. The connecting part 272 is located on the side of the mating frame 271. The limiting part 273 is located on the side of the connecting part 272, and the limiting part 273 is slidably sleeved on the outside of the lead screw 17. The limiting part 273 is fitted against the side of the nut 18. The assembly column 274 is fixed to the top of the telescopic tube 13 and is slidably connected to the inside of the mating frame 271. The support member 28 is located inside the movable cover 23 and is used to support the movable cover 23.

[0023] More specifically, the protective structure 2 also includes a guide frame 25, a sliding plate 26, an indicator ruler 261, a guide rail 29, a rubber plate 210, a first support plate 211, and a second support plate 212. The guide frame 25 is convenient to connect with the sliding plate 26, thereby facilitating the support and horizontal guidance of the sliding cover 23. The scale on the indicator ruler 261 is aligned with the side of the guide frame 25, allowing the specific moving position of the moving cover 23 to be observed, facilitating the direct sliding operation of the moving cover 23 into position. Simultaneously, data can be recorded to allow the moving cover 23 to slide directly to the corresponding scale position when using square tubes 12 and telescopic tubes 13 of different lengths. The guide rail 29 facilitates the rolling of the support part 281 and the roller 286 along its interior, thereby providing bottom support for the movement of the moving cover 23 and improving the stability of the moving cover 23. The rubber plate 210 extends to provide protection for the top of the lead screw 17 and the arc frame 19. Additionally, the rubber plate 210 can contact the steel pile 1. Even after deformation, it can still provide shielding and protection. The height of the first support plate 211 is greater than that of the second support plate 212. The first support plate 211 and the second support plate 212 facilitate the removal of the protective cover 21 and the movable cover 23 from the square tube 12. With the openings of the protective cover 21 and the movable cover 23 facing upwards, the first support plate 211 and the second support plate 212 can be used to place them directly on the ground to support the protective cover 21 and the movable cover 23. The guide frame 25 is fixed to the outside of the protective cover 21, and the sliding plate 26 is fixed. The sliding plate 26 is slidably connected to the inside of the guide frame 25 and is fixed to the outside of the movable cover 23. The indicator ruler 261 is embedded in the side of the sliding plate 26 away from the movable cover 23. The guide rail 29 is fixed to the top of the square tube 12. The rubber plate 210 is fixed to the end of the movable cover 23 near the steel pile 1. The first support plate 211 is fixed to the top of the movable cover 23 and the second support plate 212 is fixed to the top of the protective cover 21. The first support plate 211 and the second support plate 212 are used to support the removed protective cover 21.

[0024] Specifically, the support member 28 includes a support portion 281, a supporting portion 282, an extension frame 283, a docking portion 285, and a roller 286. The support portion 281 facilitates the rotation of the roller 286 on it. The supporting portion 282 facilitates the connection between the support portion 281 and the extension frame 283 to support the extension frame 283. The extension frame 283 is U-shaped, which facilitates the support of the shielding portion 284. The docking portion 285 facilitates the fixing of both the support portion 281 and the extension frame 283 to the inner wall of the movable cover 23. The roller 286 facilitates rolling along the inside of the guide rail 29 to support the movement of the movable cover 23. The support portion 281 slides on the guide rail 29. Inside the rail 29, the support part 282 is located on the side of the support part 281, the extension frame 283 is located on the side of the support part 282, and the side of the extension frame 283 is fixed with a shielding part 284, which is beneficial to shield and protect the two ends of the second pin 16, preventing the second pin 16 from sliding randomly, so as to improve the stability of the connection between the square tube 12 and the telescopic tube 13. The shielding part 284 is located on the side of the square tube 12 and close to the end of the second pin 16. The adjacent mating parts 285 are located on the top of the support part 281 and the extension frame 283 respectively. The top of the mating part 285 is fixed to the top of the inner wall of the movable cover 23. The roller 286 is rotatably connected to the bottom of the support part 281.

[0025] Furthermore, the connecting structure 3 includes an assembly frame 31, a plug-in post 32, and a positioning element 33. The assembly frame 31 facilitates support for the protective cover 21, and the plug-in post 32 facilitates connection with the assembly frame 31, thereby facilitating the positioning of the assembly frame 31 for the connection of the protective cover 21. The assembly frame 31 is fixed to the top of the inner wall of the protective cover 21, and the plug-in post 32 is fixed to the top of the square tube 12. The bottom of the assembly frame 31 has a first sliding groove adapted to the plug-in post 32. The positioning element 33 includes a support body 331, a locking part 332, and a frame 333. The support body 331 facilitates support for the locking part 332 and also facilitates the movement of the locking part 332. The bottom of the locking part 332 has an inclined surface, which facilitates pressing against the plug-in post 32 to directly achieve locking. In operation, the locking part 332 helps to limit the relative position of the assembly frame 31 and the plug-in post 32, which in turn facilitates the connection and fixation or disassembly of the protective cover 21 and the square tube 12, making operation convenient. It should be noted that the top of the frame 333 is trapezoidal, which helps to push the support 331 to move horizontally, so that the support 331 drives the locking part 332 to separate from the plug-in post 32. The support 331 slides between the assembly frame 31 and the lower pressure frame 22. The top of the protective cover 21 is provided with a second sliding groove that matches the support 331. The locking part 332 is located on the side of the support 331 and slides on the side of the assembly frame 31. The side of the plug-in post 32 is provided with a positioning groove that matches the locking part 332. The frame 333 is fixed to the top of the support 331.

[0026] Furthermore, the connecting structure 3 also includes a fixing rod 34, a first spring 35, and an extension frame 36. The fixing rod 34 facilitates the horizontal guidance of the sliding of the support body 331 and the deformation of the first spring 35. The elastic force of the first spring 35 facilitates the movement of the support body 331, which in turn facilitates the movement of the locking part 332, so that the locking part 332 returns to its original position after movement, making it easy to repeat the operation of the locking part 332. The extension frame 36 facilitates cooperation with the frame 333 to raise and protect the interior of the second slide groove. The fixing rod 34 is fixed between the lower pressure frame 22 and the assembly frame 31. The outer wall of the fixing rod 34 is slidably connected to the support body 331. The first spring 35 is sleeved on the outside of the fixing rod 34. The two ends of the first spring 35 are fixed to the lower pressure frame 22 and the support body 331, respectively. The extension frame 36 is fixed to the top of the protective cover 21 and located inside the frame 333.

[0027] Furthermore, the storage structure 4 includes a storage frame 41, a cover plate 42, a bearing member 43, a support frame 44, and a mounting plate 45. The storage frame 41 facilitates the storage of accessories such as the first pin 15 and the second pin 16 that are matched with the square tube 12 and the telescopic tube 13, allowing them to be carried together without disassembly, thus reducing the risk of loss. The cover plate 42 is directly placed on top of the storage frame 41, and with the cooperation of the bottom of the square tube 12, it limits the top position of the cover plate 42. The support frame 44 is U-shaped, which facilitates its sliding connection with one of the mounting plates 45 to support the installation of the storage frame 41. The mounting plate 45 facilitates the sliding of the storage frame 41 with the support frame 44 and the bearing member 432, enabling the sliding installation and support of the storage frame 41. The storage frame 41 is located at the bottom of the square tube 12, and the cover plate 42 is located at the top of the storage frame 41. The support member 43 includes an outlet 431 and a support part 432. The outlet 431 is convenient to connect with the plug post 32 and to support the support part 432. The support part 432 is convenient to slide with another mounting plate 45. The outlet 431 is fixed to the side of the plug post 32. The side of the assembly frame 31 is provided with a slot adapted to the outlet 431. The support part 432 is located at the bottom of the outlet 431. The support frame 44 is fixed to the outside of the square tube 12. The storage frame 41 is located between the support part 432 and the support frame 44. The mounting plate 45 is fixed to the side of the storage frame 41. The support part 432 and the support frame 44 are both provided with sliding grooves adapted to the mounting plate 45 on opposite sides.

[0028] Furthermore, the storage structure 4 also includes a locking element 46, a second spring 47, and a guide ring 48. The elasticity of the second spring 47 facilitates the movement of the pressing part 465, allowing it to return to its original position after moving the traction part 464 and the sliding body 461. This facilitates repeated operation of the locking part 463. The guide ring 48 allows the traction part 464 to slide within it and also supports the compression of the second spring 47. The locking element 46 includes a sliding body 461, a protective part 462, and a locking part 463. 3. The traction part 464 and the pressing part 465, the sliding body 461 facilitates the movement of the locking part 463, and also facilitates the support of the locking part 463. The protective part 462 facilitates the shielding and protection of the interior of the groove 49. The locking part 463 facilitates the fixing of the mounting plate 45 and the bearing part 432 or the support frame 44, so as to connect, fix or disassemble the storage frame 41. The traction part 464 facilitates the traction and support of the sliding body 461. The pressing part 465 facilitates the movement of the traction part 464, and also facilitates the movement of the sliding body 463. When the second spring 47 is pressed down, the sliding body 461 is located at the bottom of the storage frame 41. The supporting part 432 and the support frame 44 each have a groove 49 on their opposite sides that matches the end of the sliding body 461, facilitating the sliding of the sliding body 461 within it. The protective part 462 is located at the bottom of the sliding body 461 and is used to shield and protect the inside of the groove 49. The snap-fit ​​part 463 is fixed to the top of the sliding body 461, and the snap-fit ​​part 463 is slidably inserted into the top of the groove 49 with one end extending into the sliding groove. The bottom of the mounting plate 45 is provided with a slot that matches the snap-fit ​​part 463. The traction part 464 is located at the top of the sliding body 461. The top of the inner wall of the groove 49 is provided with a circular groove that matches the traction part 464. The pressing part 465 is located at the end of the traction part 464 away from the sliding body 461. The second spring 47 is sleeved on the outside of the traction part 464. The guide ring 48 is fixed inside the circular groove. The traction part 464 is slidably connected to the inside of the guide ring 48. The two ends of the second spring 47 are fixed to the pressing part 465 and the guide ring 48, respectively.

[0029] Working principle of this invention: When it is necessary to construct retaining walls after the excavation of the foundation pit, the steel pile 1 is hoisted into the foundation pit. Then, according to the measured position, the steel pile 1 is inserted into the corresponding position at the bottom of the foundation pit. After the construction of multiple steel piles 1 is completed, the retaining plate 11 is hoisted to the foundation pit and positioned between adjacent steel piles 1. Then, the retaining plate 11 is slidably connected to the steel pile 1, and the retaining plate 11 is lowered into the foundation pit. The retaining plate 11 then protects the inner wall of the foundation pit by retaining soil. Then, the square tube 12 and the telescopic tube 13 are pre-adjusted to their working length and the position of the arc frame 19 through the second pin 16, and then hoisted between the relative steel piles 1. Then, the end of the square tube 12 is placed on the adjacent support 14, and the first pin 15 is connected to the support 14 and the square tube 12. Then, the arc frame 19 is abutted against the outside of the relative steel pile 1, thereby supporting the relative steel pile 1. Then, bring the protective cover 21 to the top of the square tube 12, and slide the movable cover 23 inside the protective cover 21 so that the lengths of the movable cover 23 and the protective cover 21 correspond to the positions of the square tube 12 and the telescopic tube 13. Insert the assembly frame 31 into the insertion post 32, and fit the docking frame 271 into the assembly post 274. The limiting part 273 limits the side of the nut 18, the blocking part 284 limits the end of the second pin 16, and the pressing frame 22 limits the top of the first pin 15. As the assembly frame 31 moves downward, the locking part 332 first presses against the top of the insertion post 32 to push the locking part 332 to slide horizontally, and then pushes the support body 331 to move. The support body 331 compresses the first spring 35, and the first spring 35 generates elastic force on the support body 331. As the assembly frame 31 continues to move downward, when the locking part 332 corresponds to the inside of the positioning groove, the elastic force of the first spring 35 pushes the support body 331 to drive the locking part 332 to insert into the inside of the positioning groove, so that... The protective cover 21 is fixed to the square tube 12, and the protective cover 21 and the movable cover 23 provide shielding protection for the top of the square tube 12 and the telescopic tube 13. When it is necessary to lower the pipe into the pit, first push the frame 333 to slide horizontally. The frame 333 drives the support 331 to move, thereby causing the support 331 to disengage the locking part 332 from the plug-in post 32. At this time, the position restriction on the assembly frame 31 is released. Then, the protective cover 21 and the movable cover 23 are lifted upward and separated. One of the first pins 15 is disengaged upwards, and then the square tube 12 is rotated in a circle around the other first pin 15, so that the square tube 12 and the telescopic tube 13 are moved away from the relative steel pile 1. Then, when the pipe is lowered to the top of the lower square tube 12 and the telescopic tube 13, the upper square tube 12 and the telescopic tube 13 are rotated back to their original positions to continue supporting the steel pile 1. Then the lower square tube 12 is moved away from the relative steel pile 1 in the same way, and the pipe continues to fall. During the pre-adjustment of the square tube 12 and the telescopic tube 13, the sliding body 461 is pulled down to move, and the sliding body 461 drives the locking part 463 to move down, thereby causing the locking part 463 to disengage from the mounting plate 45. At this time, the position restriction of the mounting plate 45 is released, and then the storage frame 41 is slid between the bearing part 432 and the support frame 44 to remove the storage frame 41. Then the cover plate 42 is removed to take out the first pin 15 and the second pin 16 for use.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A telescopic sheet pile retaining structure for foundation pits, characterized in that: include: Steel pile (1), with retaining plates (11) slidably installed between adjacent steel piles (1). A square tube (12) and a telescopic tube (13), wherein the telescopic tube (13) slides inside the square tube (12), and the square tube (12) and the telescopic tube (13) are placed between opposing steel piles (1); The protective structure (2) is located on the top of the square tube (12) and is used to shield and protect the top of the square tube (12) and the telescopic tube (13). A connecting structure (3) is located on the protective structure (2) and is used to fix or separate the protective structure (2) from the square tube (12).

2. The expansive sheet pile retaining structure for foundation pits according to claim 1, characterized in that: Also includes: The bracket (14) is fixed to the outside of the steel pile (1), and the end of the square tube (12) near the steel pile (1) is located between adjacent brackets (14); The first pin (15) slides through the adjacent bracket (14) and square tube (12); The second pin (16) slides through the square tube (12) and the telescopic tube (13); A lead screw (17) is threaded to the end of the telescopic tube (13) away from the square tube (12); Nut (18), the nut (18) being threaded onto the outside of the lead screw (17); Arc-shaped frame (19), said arc-shaped frame (19) is installed at the end of the lead screw (17) away from the telescopic tube (13); Storage structure (4) is placed at the bottom of square tube (12) and is used to store the first pin (15), the second pin (16) and other tools.

3. The expansive sheet pile retaining structure for foundation pits according to claim 2, characterized in that: The protective structure (2) includes: A protective cover (21) is provided on the top of the square tube (12); The lower pressure frame (22) is fixed to the top of the inner wall of the protective cover (21), and the bottom of the lower pressure frame (22) is attached to the top of the first pin (15); A movable cover (23) is placed on top of the telescopic tube (13), and the movable cover (23) slides inside the protective cover (21); Support column (24), the support column (24) is fixed to the top of the movable cover (23) and is slidably connected to the inside of the protective cover (21); The docking member (27) includes: A docking frame (271) is fixed to the top of the inner wall of the movable cover (23); A connecting part (272) is located on the side of the docking frame (271); The limiting part (273) is located on the side of the connecting part (272), the limiting part (273) is slidably sleeved on the outside of the lead screw (17), and the limiting part (273) is attached to the side of the nut (18); Assembly column (274), the assembly column (274) is fixed to the top of the telescopic tube (13), and the assembly column (274) is slidably connected to the inside of the docking frame (271); Support member (28) is located inside the movable cover (23) and is used to support the movable cover (23).

4. The expansive sheet pile retaining structure for foundation pits according to claim 3, characterized in that: The protective structure (2) also includes: Guide frame (25), the guide frame (25) is fixed to the outside of the protective cover (21); A sliding plate (26) is fixed to the outside of the movable cover (23), and the sliding plate (26) is slidably connected to the inside of the guide frame (25); Indicator ruler (261), which is embedded in the side of the sliding plate (26) away from the movable cover (23); Guide rail (29), the guide rail (29) is fixed to the top of square tube (12); A rubber sheet (210) is fixed to the end of the movable cover (23) near the steel pile (1); The first support plate (211) is fixed to the top of the movable cover (23); The second support plate (212) is fixed to the top of the protective cover (21), and the first support plate (211) and the second support plate (212) are used to support the removed protective cover (21).

5. The expansive sheet pile retaining structure for foundation pits according to claim 4, characterized in that: The support member (28) includes: Support (281), which slides inside the guide rail (29); The support portion (282) is located on the side of the support portion (281); Extension frame (283), the extension frame (283) is located on the side of the support (282), and a shielding part (284) is fixed on the side of the extension frame (283). The shielding part (284) is located on the side of the square tube (12) and close to the end of the second pin (16). The docking part (285) is located on the top of the support part (281) and the extension frame (283) respectively, and the top of the docking part (285) is fixed to the top of the inner wall of the movable cover (23); A roller (286) is rotatably connected to the bottom of a support (281).

6. The expansive sheet pile retaining structure for foundation pits according to claim 5, characterized in that: The connection structure (3) includes: Assembly frame (31), said assembly frame (31) is fixed to the top of the inner wall of the protective cover (21); The plug-in post (32) is fixed to the top of the square tube (12), and the bottom of the assembly frame (31) is provided with a first sliding groove that is adapted to the plug-in post (32). Positioning element (33), the positioning element (33) includes: Support body (331), which slides between assembly frame (31) and pressure frame (22), and the top of the protective cover (21) is provided with a second sliding groove that is adapted to the support body (331); Locking part (332), the locking part (332) is located on the side of the support (331), the locking part (332) slides on the side of the assembly frame (31), and the side of the plug-in post (32) is provided with a positioning groove that is adapted to the locking part (332). The frame (333) is fixed to the top of the support (331).

7. The expansive sheet pile retaining structure for foundation pits according to claim 6, characterized in that: The connection structure (3) also includes: A fixing rod (34) is fixed between the lower pressure frame (22) and the assembly frame (31), and the outer wall of the fixing rod (34) is slidably connected to the support body (331); The first spring (35) is sleeved on the outside of the fixed rod (34), and the two ends of the first spring (35) are fixed to the lower pressure frame (22) and the support body (331) respectively. An extension frame (36) is fixed to the top of the protective cover (21) and located inside the frame (333).

8. The expansive sheet pile retaining structure for foundation pits according to claim 7, characterized in that: The storage structure (4) includes: Storage frame (41), the storage frame (41) is located at the bottom of square tube (12); A cover plate (42) is located on top of the storage frame (41); The support member (43) includes: Lead-out portion (431), the lead-out portion (431) is fixed to the side of the plug-in post (32), and the side of the assembly frame (31) is provided with a slot adapted to the lead-out portion (431); The support portion (432) is located at the bottom of the lead-out portion (431); A support frame (44) is fixed to the outside of the square tube (12), and the storage frame (41) is located between the bearing part (432) and the support frame (44); Mounting plate (45) is fixed to the side of storage frame (41). The bearing part (432) and the support frame (44) are provided with sliding grooves that are adapted to the mounting plate (45) on opposite sides.

9. The expansive sheet pile retaining structure for foundation pits according to claim 8, characterized in that: The storage structure (4) also includes: Locking element (46), said locking element (46) includes: The sliding body (461) is located at the bottom of the storage frame (41). The bearing part (432) and the support frame (44) are respectively provided with grooves (49) that are adapted to the end of the sliding body (461). The protective part (462) is located at the bottom of the sliding body (461) and is used to shield and protect the interior of the groove (49); The snap-fit ​​part (463) is fixed to the top of the sliding body (461). The snap-fit ​​part (463) is slidably inserted into the top of the groove (49) and one end extends into the interior of the sliding groove. The bottom of the mounting plate (45) is provided with a snap-fit ​​groove that is compatible with the snap-fit ​​part (463). The traction part (464) is located at the top of the sliding body (461), and the top of the inner wall of the groove (49) is provided with a circular groove that is adapted to the traction part (464). The pressing part (465) is located at the end of the traction part (464) away from the sliding body (461); The second spring (47) is sleeved on the outside of the traction part (464); The guide ring (48) is fixed inside the circular groove. The traction part (464) is slidably connected to the inside of the guide ring (48). The two ends of the second spring (47) are respectively fixed to the pressing part (465) and the guide ring (48).

10. A construction method for a foundation pit expansion sheet pile support structure, applied to the foundation pit expansion sheet pile support structure described in any one of claims 1-9, characterized in that: The specific usage steps are as follows: Step 1: When it is necessary to construct retaining walls after the excavation of the foundation pit, the steel piles (1) are hoisted into the foundation pit. Then, according to the measured position, the steel piles (1) are inserted into the corresponding positions at the bottom of the foundation pit. After the construction of multiple steel piles (1), the retaining plate (11) is hoisted to the foundation pit and positioned between adjacent steel piles (1). Then, the retaining plate (11) is slidably connected to the steel piles (1), and the retaining plate (11) is lowered into the foundation pit. The retaining plate (11) then protects the inner wall of the foundation pit by retaining soil. Then, the square tube (12) and the telescopic tube (13) are pre-adjusted to their working length and the position of the arc frame (19) are adjusted by the second pin (16). They are then hoisted between the relative steel piles (1). The end of the square tube (12) is placed on the adjacent support (14). The first pin (15) is then connected to the support (14) and the square tube (12). The arc frame (19) is then attached to the outside of the relative steel pile (1) to support the relative steel pile (1). Step 2: Then, bring the protective cover (21) to the top of the square tube (12), and slide the movable cover (23) inside the protective cover (21) so that the lengths of the movable cover (23) and the protective cover (21) correspond to the positions of the square tube (12) and the telescopic tube (13). Insert the assembly frame (31) into the plug-in post (32), and fit the docking frame (271) into the assembly post (274). The limiting part (273) limits the side of the nut (18), the blocking part (284) limits the end of the second pin (16), and the pressing frame (22) limits the first pin (18). 5) The top of the assembly frame (31) is limited. When the assembly frame (31) moves down, the locking part (332) first presses against the top of the plug post (32) to push the locking part (332) to slide horizontally, and then pushes the support body (331) to move. The support body (331) compresses the first spring (35). The first spring (35) generates elastic force on the support body (331). As the assembly frame (31) continues to move down, when the locking part (332) corresponds to the inside of the positioning groove, the elastic force of the first spring (35) pushes the support body (331) to drive the locking part (332) to the inside of the positioning groove. The protective cover (21) and the square tube (12) are connected to each other to fix the protective cover (21) and the square tube (12). The protective cover (21) and the movable cover (23) then shield and protect the top of the square tube (12) and the telescopic tube (13). When it is necessary to lower the pipe inside the pit, first push the frame (333) to slide horizontally. The frame (333) drives the support (331) to move, which in turn causes the support (331) to drive the locking part (332) to disengage from the plug-in column (32). At this time, the position restriction on the assembly frame (31) is released. Then, the protective cover (21) and the movable cover (23) are lifted upwards. Then, one of the first pins (15) is disengaged upwards, and the square tube (12) is rotated in a circle around the other first pin (15) so that the square tube (12) and the telescopic tube (13) are moved away from the relative steel pile (1). Then, when the pipe is lowered to the top of the lower square tube (12) and the telescopic tube (13), the upper square tube (12) and the telescopic tube (13) are rotated back to their original positions to continue supporting the steel pile (1). Then, the lower square tube (12) is moved away from the relative steel pile (1) in the same way, and the pipe continues to fall. Step 3: During the pre-adjustment of the square tube (12) and the telescopic tube (13), pull down the sliding body (461) to move it. The sliding body (461) drives the snap-fit ​​part (463) to move down, thereby causing the snap-fit ​​part (463) to disengage from the mounting plate (45). At this time, the position restriction on the mounting plate (45) is released. Then, the storage frame (41) slides between the bearing part (432) and the support frame (44) to remove the storage frame (41). Then, the cover plate (42) is removed to take out the first pin (15) and the second pin (16) for use.

Images