Steel sheet pile cofferdam and construction method thereof

Abstract

The invention discloses a steel sheet pile cofferdam and a construction method thereof, and relates to the technical field of cofferdams, the steel sheet pile cofferdam comprises a plurality of steel sheet piles, and every two steel sheet piles are detachably connected; the steel sheet pile comprises a pile body, a plurality of movable parts and a control assembly. A cavity is formed in the pile body; the movable part is movably connected with the pile body; the sliding piece is in sliding connection with the pile body; the driving piece is located in the cavity; after the pile body is inserted into soil, the multiple movable parts move to the limiting position in the direction close to the pile body, the driving part is located at the bottom of the cavity, and the end, away from the driving part, of the sliding part is located above the pile body. The driving part can sequentially drive the multiple movable parts to move in the direction away from the cavity from bottom to top in the upward moving process. The steel sheet piles can be conveniently pulled out of soil, so that the dismantling process of the steel pipe pile cofferdam is more convenient, and the construction efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of cofferdams, and in particular to a steel sheet pile cofferdam and a construction method thereof. Background Art

[0002] A cofferdam is a temporary retaining structure built for the construction of permanent water conservancy facilities during water conservancy project construction. Its main function is to prevent water and soil from entering the construction site of the building so that drainage, foundation pit excavation and construction of buildings can be carried out within the cofferdam.

[0003] Among them, steel sheet pile cofferdam is a commonly used cofferdam form, which is particularly suitable for retaining structures in deep water or deep foundation pits. It uses steel sheet piles as the main material, and the steel sheet piles are driven into the soil by a pile driver or other methods to form a continuous and closed retaining structure to prevent water and soil from entering the construction area.

[0004] For steel pipe pile cofferdams constructed on soil with high water content, when they need to be dismantled, the stickiness of the soil and the clamping force of the soil on the steel sheet piles make it difficult to pull out the steel sheet piles, affecting the construction efficiency when dismantling the steel pipe pile cofferdam. Summary of the invention

[0005] The present application provides a steel sheet pile cofferdam and a construction method thereof, which can facilitate the extraction of the steel sheet piles from the soil, thereby making the removal process of the steel pipe pile cofferdam more convenient and improving the construction efficiency.

[0006] On the one hand, the present application provides a steel sheet pile cofferdam, which adopts the following technical solution: A steel sheet pile cofferdam comprises a plurality of steel sheet piles, wherein two of the steel sheet piles are detachably connected to each other; The steel sheet pile comprises a pile body, a plurality of movable parts and a control assembly; The pile body is in a rectangular plate-like structure as a whole and has a cavity inside; The plurality of movable parts are respectively arranged on one side of the pile body in the thickness direction, and the movable parts are movably connected with the pile body in the thickness direction of the pile body; the movable part has a force-bearing part at one end close to the pile body, and the force-bearing part has a wedge-shaped structure; when the movable part moves to the extreme position in the direction close to the pile body, the force-bearing part is located in the cavity, and the surface of the movable part is flush with the surface of the pile body; The control assembly comprises a sliding member and a driving member; the sliding member is slidably connected to the pile body along the length direction of the pile body, one end of the sliding member is located in the cavity and the other end is located outside the pile body; the driving member is located in the cavity, one end of the sliding member located in the cavity is connected to the driving member, and one end of the driving member close to the movable member has a wedge-shaped structure; After the pile body is inserted into the soil, the multiple movable parts all move to the extreme position in the direction close to the pile body, the driving part is located at the bottom of the cavity, and the end of the sliding part away from the driving part is located above the pile body; at this time, the sliding part slides upward to drive the driving part to move upward, and during the upward movement of the driving part, the multiple movable parts can be driven in sequence from bottom to top to move in the direction away from the cavity.

[0007] By adopting the above technical solution, when the steel sheet pile needs to be pulled out of the soil, the sliding part is controlled to slide upward to drive the driving part to move upward, so that multiple movable parts can be driven outward in sequence from bottom to top to push the soil on one side of the pile body to move away from the pile body, thereby loosening the soil, making it easier for the subsequent driving part to abut against the top of the pile body and drive the pile body to move upward and be pulled out of the soil, thereby making the removal process of the steel pipe pile cofferdam more convenient and improving construction efficiency.

[0008] Optionally, the steel sheet pile further comprises a plurality of locking components, and the locking components are arranged at one end of the pile body through which the sliding member passes; The locking assembly includes a locking piece, which is movably connected to the pile body, and has a locking portion at one end of the locking piece close to the sliding piece, and a locking groove matched with the locking portion is provided on the sliding piece; when the driving piece is located at one end of the cavity away from the locking assembly, the locking portion is aligned with the locking groove along the movable direction of the locking piece.

[0009] By adopting the above technical solution, the locking assembly can make the sliding part have two states: free sliding and sliding locking. This makes it convenient for construction personnel to locate the driving part at the bottom of the cavity and put the sliding part in a sliding locking state when the steel sheet pile needs to be inserted into the soil; when the steel sheet pile needs to be pulled out, the sliding part is in a free sliding state.

[0010] Optionally, the locking assembly further comprises an operating member; the pile body is provided with a first socket and a second socket for inserting the operating member, and the first socket and the second socket both penetrate the pile body in a direction away from the cavity to form an opening; One end of the operating member has a wedge-shaped structure, and the side of the locking member facing away from the cavity also has a wedge-shaped structure; when the locking member moves to an extreme position in a direction away from the sliding member, the operating member can be inserted into the first socket to drive the locking member to move in a direction close to the sliding member, so that the locking portion can be inserted into the locking groove; when the locking portion is plugged into the locking groove, the operating member can be inserted into the second socket to drive the locking member to move to an extreme position in a direction away from the sliding member.

[0011] By adopting the above technical solution, construction workers can conveniently control the movement of the locking member according to needs, and at the same time can effectively improve the position stability of the locking member after controlling the movement of the locking member, thereby making the use of the locking assembly more convenient and reliable.

[0012] Optionally, the steel sheet pile further includes a plurality of first elastic members, both ends of which are respectively connected to the movable member and the pile body, and can drive the movable member to have a tendency to move toward the direction approaching the cavity to an extreme position and maintain the position.

[0013] By adopting the above technical solution, the movable part can be conveniently kept in a position where the surface is flush with the surface of the pile body, thereby facilitating the insertion of the steel sheet pile into the soil. At the same time, the movable part can be quickly moved and reset after loosening the soil during the process of pulling the steel sheet pile out of the soil, thereby reducing the probability of soil entering the cavity through the gap between the movable part and the pile body.

[0014] Optionally, the driving member forms a seal in the cavity, and when the movable member moves to an extreme position in a direction away from the cavity, a gap is formed between the movable member and the pile body.

[0015] By adopting the above technical solution, during the upward movement of the driving part, the gas can be driven to push the movable part outward, so that the gas can be blown out through the gap between the movable part and the pile body, thereby increasing the frequency of the movable part loosening the soil and further reducing the probability of soil entering the cavity through the gap between the movable part and the pile body.

[0016] Optionally, the steel sheet pile further includes a plurality of elastic seals, which are arranged on the pile body, and the plurality of seals are respectively located around the plurality of movable parts.

[0017] By adopting the above technical solution, the sealing member can improve the sealing performance between the movable member and the pile body, thereby further reducing the probability of soil entering the cavity through the gap between the movable member and the pile body.

[0018] Optionally, the steel sheet pile further comprises an airbag, and the airbag is arranged at an end of the cavity close to an end of the sliding member away from the driving member; A plurality of air flow channels are provided inside the pile body, an air cavity is provided inside the seal, and both ends of the plurality of air flow channels are respectively connected to the airbag and the plurality of seals; when the seal expands due to the inflation of the air cavity, the seal can drive the adjacent movable parts to move in a direction away from the cavity.

[0019] By adopting the above technical solution, during the process of pulling out the steel sheet piles, when the driving member moves to abut against the airbag, the airbag can be squeezed to drive the sealing member to inflate and expand through multiple air flow channels, thereby pushing the corresponding movable member outward to further loosen the soil, thereby further facilitating the pulling out of the steel sheet piles.

[0020] Optionally, when the force applied by the driving member to the airbag is greater than the gravity of the steel sheet pile and exceeds a certain value, the airbag is deformed by the force.

[0021] By adopting the above technical solution, when the driving member moves upward to abut against the airbag and applies an upward force to the pile body through the airbag, the pile body can be driven out. When the resistance of the soil to the pile body is large, the force applied by the driving member to the airbag will increase and squeeze the airbag, thereby reducing the resistance of the soil to the pile body.

[0022] Optionally, the steel sheet pile further comprises a buffer component, and the buffer component is arranged at one end of the cavity close to the airbag; The buffer assembly includes an abutment plate and a plurality of second elastic members; the abutment plate is connected to the airbag and is located between the airbag and the driving member; the two ends of the second elastic member are respectively connected to the abutment plate and the pile body, and has the function of driving the abutment plate to move in a direction away from the airbag to an extreme position and maintain it; when the abutment plate moves in a direction away from the airbag to an extreme position, the movable member remains in a position state where it moves to an extreme position close to the cavity.

[0023] By adopting the above technical solution, the buffer component can reduce the wear of the airbag caused by direct contact between the driving part and the airbag, and at the same time can facilitate the airbag to remain filled when the resistance of the soil to the pile body is small, thereby further reducing the probability of external soil entering the cavity through the gap between the movable part and the pile body due to the expansion of the seal.

[0024] On the other hand, the present application also provides a construction method of a steel sheet pile cofferdam, which adopts the following technical solution: A construction method of a steel sheet pile cofferdam, used for constructing the above-mentioned steel sheet pile cofferdam, comprises the following steps: Inserting a plurality of the steel sheet piles in sequence to form a connection between adjacent steel sheet piles; when inserting the steel sheet piles, inserting the steel sheet piles into the soil with the driving member located at the bottom of the cavity; Construction is carried out in a space enclosed by a plurality of the steel sheet piles; After the construction is completed, the plurality of steel sheet piles are pulled out in sequence. When pulling out the steel sheet piles, the driving member is first controlled to move upward by the sliding member, and the plurality of movable members are driven to move in a direction away from the cavity from bottom to top in sequence, so that the soil on one side of the pile body is loosened from bottom to top. Then, an upward force is applied to the pile body by the driving member, so that the pile body is driven to move upward and be pulled out of the soil.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. In the process of pulling out the steel sheet piles, the surrounding soil can be loosened before pulling them out, reducing the resistance of the soil to the pulling out of the steel sheet piles, thereby making the removal process of the steel pipe pile cofferdam more convenient and improving the construction efficiency; 2. In the process of pulling out the steel sheet pile, the surrounding soil is loosened by the movable parts, which can effectively reduce the probability of external soil entering the cavity through the gap between the movable parts and the pile body; 3. During the process of pulling out the steel sheet piles, when the soil resistance to the steel sheet piles is large, the movable parts can be driven to loosen the soil according to demand, and the resistance of the soil to the steel sheet piles can be reduced in time. At the same time, a good seal is maintained between the movable parts and the pile body, making the process of pulling out the steel sheet piles more convenient, labor-saving and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a portion of a steel sheet pile cofferdam according to an embodiment of the present application; Figure 2 : is a schematic diagram of the structure of the steel sheet pile in the embodiment of the present application (the structure connected with other steel sheet piles is omitted); Figure 3 yes Figure 2 The cross-sectional view along the AA line; Figure 4 yes Figure 3 The enlarged view of point B in the middle; Figure 5 yes Figure 3 Enlarged view of point C in the middle; Figure 6 yes Figure 5 A schematic diagram of the structure when the locking member releases the sliding lock of the sliding member.

[0027] Explanation of the reference numerals: 1. Steel sheet pile; 2. Pile body; 21. Cavity; 22. Air flow channel; 23. First socket; 24. Second socket; 3. Movable part; 31. Force-bearing part; 4. Control assembly; 41. Sliding part; 411. Locking groove; 42. Driving part; 5. Locking assembly; 51. Locking part; 511. Locking part; 52. Operating part; 6. Sealing part; 61. Air cavity; 7. Airbag; 8. Buffer assembly; 81. Abutment plate; 82. Second elastic part; 9. First elastic part. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-6 This application is described in further detail.

[0029] Embodiment 1: The embodiment of the present application discloses a steel sheet pile cofferdam, which can enclose a construction area of ​​a desired shape and size on soil with a high water content. The steel sheet pile cofferdam can prevent water and soil from entering the construction area, thereby facilitating construction workers to excavate foundation pits and build buildings in the construction area.

[0030] Reference Figure 1 and Figure 2 The steel sheet pile cofferdam includes a plurality of steel sheet piles 1, and the steel sheet piles 1 are in a rectangular plate-like structure as a whole. During the construction of the steel sheet pile cofferdam, the steel sheet piles 1 need to be driven into the soil one by one by a pile driver or other methods, so that the steel sheet piles 1 are in a vertical position in the length direction after being inserted into the soil. In this embodiment, for the convenience of the drawing display, only a part of the steel sheet pile cofferdam (the structure after the plurality of steel sheet piles 1 are connected) is shown.

[0031] When adjacent steel sheet piles 1 are inserted into the soil, one end of the steel sheet pile 1 in the width direction can be connected to one end of another steel sheet pile 1 in the width direction, and the adjacent steel sheet piles 1 have a certain sealing after being connected, so that multiple steel sheet piles 1 can be inserted into the soil and connected to each other to form a construction area. In this embodiment, it is preferred that adjacent steel sheet piles 1 are detachably connected by means of a clamping block and a clamping groove, and the steel sheet pile 1 can be inserted into the soil in a vertical direction in a vertical position in the length direction to form a connection with the adjacent steel sheet piles 1; since the clamping is a common prior art, it will not be described in detail here, and it is only briefly shown in the accompanying drawings.

[0032] Reference Figure 2 and Figure 3 The steel sheet pile 1 includes a pile body 2, a plurality of movable parts 3, a control component 4, a locking component 5, a plurality of sealing components 6, an airbag 7 and a buffer component 8.

[0033] The pile body 2 is a rectangular plate-like structure as a whole, and one end of the pile body 2 in the length direction has a tip structure that facilitates its insertion into the soil. When the steel sheet pile 1 is inserted into the soil, the tip structure of the pile body 2 is located at the bottom of the pile body 2. The pile body 2 has a cavity 21 inside, and the shape of the cavity 21 is a rectangular parallelepiped structure, and the length direction and width direction of the cavity 21 are respectively parallel to the length direction and width direction of the pile body 2. In this embodiment, for the convenience of the drawing, the tip structure of the pile body 2 is omitted.

[0034] Multiple movable parts 3 are respectively installed on one side of the pile body 2 in the thickness direction, and the multiple movable parts 3 are symmetrically distributed on the pile body 2. In this embodiment, six movable parts 3 are installed on one side of the pile body 2, and the six movable parts 3 are evenly spaced along the length direction of the pile body 2. After the steel sheet pile cofferdam is constructed, the movable parts 3 will be located on the side of the pile body 2 away from the construction space.

[0035] Reference Figure 2 and Figure 4 The movable member 3 is a rectangular plate-shaped structure as a whole, and the movable member 3 is movably connected to the pile body 2, and the movable direction of the movable member 3 is parallel to the thickness direction of the pile body 2. After the movable member 3 is installed on the pile body 2, the length direction of the movable member 3 is parallel to the width direction of the pile body 2, and the width direction is parallel to the length direction of the pile body 2.

[0036] The end of the movable part 3 close to the cavity 21 has a force-bearing portion 31. During the movement of the movable part 3 relative to the pile body 2, the force-bearing portion 31 can enter and exit the cavity 21, and the movable part 3 can keep the cavity 21 sealed to a certain extent. When the movable part 3 moves to the extreme position in the direction close to the cavity 21, the end face of the movable part 3 away from the cavity 21 is flush with the corresponding end face of the pile body 2, and the force-bearing portion 31 is completely located in the cavity 21; when the movable part 3 moves to the extreme position in the direction away from the cavity 21, the end of the movable part 3 away from the cavity 21 protrudes relative to the end face of the pile body 2, and the force-bearing portion 31 just completely leaves the cavity 21.

[0037] A plurality of first elastic members 9 are also installed between the movable member 3 and the pile body 2. The two ends of the first elastic member 9 are respectively fixedly connected to the movable member 3 and the pile body 2, and have a tendency to drive the movable member 3 to move to the extreme position in the direction close to the cavity 21 and maintain it. In this embodiment, the first elastic member 9 is preferably a tension spring; since the tension spring is a common prior art, it will not be described in detail here, and it is only briefly shown in the drawings.

[0038] Reference Figure 3 and Figure 4 , multiple sealing members 6 correspond to multiple movable members 3 one by one, the sealing members 6 are annular and elastic, and the sealing members 6 are fixedly mounted on the pile body 2 and surround the corresponding movable members 3. During the movement of the movable members 3 relative to the pile body 2, the corresponding sealing members 6 can seal the gap between the movable members 3 and the pile body 2. In this embodiment, the sealing members 6 are preferably made of rubber material.

[0039] The airbag 7 is fixedly mounted on the pile body 2 and is located at one end of the cavity 21 away from the tip structure of the pile body 2. The airbag 7 has a certain elasticity. When the gas in its internal space increases, the airbag 7 expands, and when the gas in the internal space decreases, the airbag 7 shrinks. In this embodiment, the airbag 7 is preferably also made of rubber material.

[0040] The seal 6 has an air cavity 61 inside. When the gas inside the air cavity 61 increases, the seal 6 will also expand, and during the expansion process, the seal 6 can drive the corresponding movable part 3 to move in the direction away from the cavity 21; when the gas inside the air cavity 61 decreases, the seal 6 will also shrink. When the seal 6 shrinks to an extreme state, the corresponding movable part 3 is in a position state of moving toward the cavity 21 to an extreme position.

[0041] A plurality of airflow channels 22 are provided in the external structure of the pile body 2, and the plurality of airflow channels 22 correspond to the plurality of sealing members 6 one by one. The two ends of the airflow channels 22 are respectively connected to the interior of the airbag 7 and the air cavity 61 of the corresponding sealing member 6. When the airbag 7 is in a normal state (i.e., not squeezed by external force), the plurality of sealing members 6 are all in a state of shrinking to an extreme state.

[0042] The buffer assembly 8 includes an abutting plate 81 and a plurality of second elastic members 82 .

[0043] The abutment plate 81 is installed in the cavity 21 and is located on the side of the airbag 7 close to the tip structure of the pile body 2. The abutment plate 81 is fixedly connected to the airbag 7, and the abutment plate 81 is movably connected to the pile body 2 along the length direction of the pile body 2. The abutment plate 81 is a rectangular plate-shaped structure as a whole, and the abutment plate 81 is installed in a position state in which its thickness direction is parallel to its own movement direction.

[0044] The second elastic member 82 is installed on the side of the abutment plate 81 close to the airbag 7, and its two ends are fixedly connected to the abutment plate 81 and the pile body 2, respectively, and has a tendency to drive the abutment plate 81 to move away from the airbag 7 to the extreme position and maintain it, and the airbag 7 is in a normal state at this time. In this embodiment, the second elastic member 82 is preferably a compression spring.

[0045] When the abutment plate 81 is subjected to an upward force that is greater than the sum of the gravity of the steel sheet pile 1 and the resistance that needs to be overcome to pull the steel sheet pile 1 out of the soil (including the force of the second elastic member 82, the elastic force of the airbag 7, etc.), the abutment plate 81 can move to squeeze the airbag 7, thereby shrinking the airbag 7 and expanding the multiple sealing members 6.

[0046] The control assembly 4 includes a sliding member 41 and a driving member 42. The driving member 42 is installed in the cavity 21. One end of the sliding member 41 in the length direction is fixedly connected to the driving member 42. The sliding member 41 passes through the end of the pile body 2 away from its tip structure and is slidably connected to the pile body 2. At the same time, it passes through the abutment plate 81, and the sliding direction of the sliding member 41 is parallel to its own length direction and the length direction of the pile body 2. During the sliding of the sliding member 41 relative to the pile body 2, its two ends in the length direction remain respectively located in the cavity 21 and on the side of the pile body 2 away from its tip structure.

[0047] During the sliding of the sliding member 41 relative to the pile body 2, the driving member 42 will move in the cavity 21 accordingly. When the sliding member 41 slides to the extreme position in the direction close to the tip structure of the pile body 2, the driving member 42 will be located at one end of the cavity 21 close to the tip structure and abut against the inner wall of the cavity 21, and the driving member 42 will be located at one side of the plurality of movable members 3 close to the tip structure of the pile body 2; when the sliding member 41 slides to the extreme position in the direction away from the tip structure of the pile body 2, the driving member 42 will be located at one end of the cavity 21 close to the tip structure of the pile body 2 and abut against the abutment plate 81, and the driving member 42 will be located at one side of the plurality of movable members 3 close to the airbag 7.

[0048] The driving member 42 has a wedge-shaped structure on one side close to the movable member 3 . The movable member 3 also has wedge-shaped structures at both ends in the width direction of the force-bearing portion 31 . The wedge-shaped structure on the driving member 42 matches the wedge-shaped structure on the force-bearing portion 31 .

[0049] After the steel sheet pile 1 is inserted into the soil, when the driving member 42 moves in the direction close to the airbag 7 at one end of the cavity 21 close to the tip structure of the pile body 2, the wedge-shaped structure of the driving member 42 will contact the wedge-shaped structures on the force-bearing parts 31 of multiple movable members 3 in sequence from bottom to top; during the contact between the wedge-shaped structure of the driving member 42 and the wedge-shaped structure of the force-bearing part 31, the corresponding movable member 3 can be driven to move in the direction away from the cavity 21 to the extreme position, at which time the movable member 3 can push the soil outside it, thereby loosening the soil and reducing the resistance of the soil during the extraction of the steel sheet pile 1, and then the movable member 3 will move and reset under the action of the first elastic member 9.

[0050] Furthermore, it is preferred that the size of the driving member 42 matches the size of the cavity 21, so that the driving member 42 can keep the cavity 21 sealed during its movement in the cavity 21. At this time, when the driving member 42 moves toward the airbag 7 at one end of the cavity 21 close to the tip structure of the pile body 2, the driving member 42 will drive the air above it to blow out through the gap between the movable member 3 and the pile body 2 above it, so as to effectively prevent the external soil from entering the cavity 21 through the gap between the movable member 3 and the pile body 2.

[0051] When the driving member 42 moves toward the direction approaching the airbag 7 until it contacts and abuts against the abutment plate 81, at this time, if the resistance to be overcome in order to pull the steel sheet pile 1 out of the soil is small, the force that drives the driving member 42 to move upward can act on the pile body 2 through the abutment plate 81 and the airbag 7 in succession, thereby helping the pile body 2 to be pulled out of the soil; at this time, if the resistance to be overcome in order to pull the steel sheet pile 1 out of the soil is large, the force that drives the driving member 42 to move upward can drive the abutment plate 81 to move upward relative to the pile body 2 to squeeze the airbag 7, causing the multiple sealing members 6 to swell and push the corresponding movable members 3 to move in the direction away from the cavity 21 to loosen the soil, thereby reducing the resistance to be overcome in order to pull the steel sheet pile 1 out of the soil, thereby facilitating the subsequent pulling out of the pile body 2 from the soil.

[0052] Reference Figure 2 and Figure 3 The locking assembly 5 is installed at one end of the pile body 2 away from its tip structure, and can lock the sliding of the sliding member 41 relative to the pile body 2, so that the sliding member 41 has two states: free sliding and sliding locking.

[0053] Reference Figure 3 and Figure 5 The locking assembly 5 includes a locking member 51 and an operating member 52 .

[0054] The locking member 51 is installed inside the end of the pile body 2 away from the tip structure and located on one side of the sliding member 41 . The end of the locking member 51 close to the sliding member 41 has a locking portion 511 . The sliding member 41 is provided with a locking groove 411 matched with the locking portion 511 .

[0055] Reference Figure 5 and Figure 6 , the locking member 51 is movably connected to the pile body 2, and the moving direction of the locking member 51 is perpendicular to the sliding direction of the sliding member 41; when the driving member 42 moves to the extreme position in the direction close to the tip structure of the pile body 2, the locking portion 511 is aligned with the locking groove 411 along the moving direction of the locking member 51. At this time, the locking member 51 can move to the extreme position in the direction close to the sliding member 41, so that the locking portion 511 and the locking groove 411 are plugged and matched, and the sliding member 41 is restricted from sliding relative to the pile body 2; when the locking member 51 moves to the extreme position in the direction away from the sliding member 41, the locking portion 511 will be located on one side of the sliding member 41, and the sliding member 41 can slide freely relative to the pile body 2.

[0056] The operating member 52 is a rectangular parallelepiped structure as a whole, and one end of the operating member 52 in the length direction has a wedge-shaped structure; the part of the locking member 51 away from the locking portion 511 also has a wedge-shaped structure on the side away from the airbag 7, and the wedge-shaped structure on the operating member 52 is compatible with the wedge-shaped structure on the locking member 51.

[0057] The end of the pile body 2 away from the tip structure is provided with a first socket 23 and a second socket 24 adapted to the operating member 52, and the first socket 23 and the second socket 24 are both located on the side of the locking member 51 away from the airbag 7. The operating member 52 can be inserted into the first socket 23 or the second socket 24 with its wedge-shaped structure facing different states, and when the operating member 52 is inserted into the first socket 23 or the second socket 24, the wedge-shaped structure of the operating member 52 can contact and abut against different positions of the wedge-shaped structure of the locking member 51.

[0058] When the locking member 51 moves to the extreme position in the direction approaching the sliding member 41, the operating member 52 is inserted into the first socket 23 at this time, and the wedge structure on the operating member 52 can cooperate and abut against one end of the wedge structure on the locking member 51, and at this time the operating member 52 can limit the movement of the locking member 51 in the direction away from the sliding member 41, so that the locking portion 511 remains plugged in and matched with the locking groove 411; at this time, the operating member 52 is inserted into the second socket 24, and the wedge structure on the operating member 52 can cooperate and abut against the other end of the wedge structure on the locking member 51, and at this time the operating member 52 can drive the locking member 51 to move to the extreme position in the direction away from the sliding member 41.

[0059] When the locking member 51 moves to the extreme position in the direction away from the sliding member 41, the operating member 52 is inserted into the second socket 24 at this time, the wedge structure on the operating member 52 can cooperate and abut against one end of the wedge structure on the locking member 51, and at this time the operating member 52 can limit the movement of the locking member 51 in the direction close to the sliding member 41, so that the locking member 51 maintains a distance from the sliding member 41; at this time, the operating member 52 is inserted into the first socket 23, the wedge structure on the operating member 52 can cooperate and abut against the other end of the wedge structure on the locking member 51, and at this time the operating member 52 can drive the locking member 51 to move to the extreme position in the direction close to the sliding member 41.

[0060] The implementation principle of a steel sheet pile cofferdam in the embodiment of the present application is: When the steel sheet pile 1 needs to be pulled out of the soil, the locking assembly 5 is first controlled to release its sliding lock on the sliding member 41, and then the sliding member 41 is controlled to slide upward relative to the pile body 2 to drive the driving member 42 to move upward in the cavity 21; in the process of the driving member 42 moving upward until it abuts against the abutment plate 81, multiple movable members 3 can be driven from bottom to top to move outward to loosen the soil, and at the same time, the gas in the cavity 21 can be driven to blow out through the gap between the movable member 3 and the pile body 2, further loosening the soil while effectively preventing the outside soil from entering, thereby reducing the resistance of the soil to the pile body 2 before the pile body 2 is pulled out upward; After the driving member 42 moves upward until it abuts against the abutment plate 81, if the resistance of the soil to the pile body 2 is small at this time, the force of the driving member 42 on the pile body 2 can directly drive the pile body 2 to be pulled out upward; if the resistance of the soil to the pile body 2 is large at this time, the driving member 42 will drive the abutment plate 81 to move upward relative to the pile body 2 to squeeze the airbag 7, and the gas inside the airbag 7 will enter the interior of the multiple sealing members 6 through the multiple air flow channels 22 to expand the sealing members 6. After the sealing members 6 are expanded, they can not only improve their sealing effect but also push the corresponding movable member 3 out a certain distance, thereby loosening the soil around the pile body 2 again, until the resistance of the soil to the pile body 2 is reduced to the extent that the pile body 2 can be pulled out upward.

[0061] Embodiment 2: The present application embodiment discloses a construction method of a steel sheet pile cofferdam, which is used to construct a steel sheet pile cofferdam as described in Example 1, comprising the following steps: S1. Insert multiple steel sheet piles 1 in sequence to form connections between adjacent steel sheet piles 1; when inserting the steel sheet piles 1, insert the steel sheet piles 1 into the soil with the driving member 42 located at the bottom of the cavity 21.

[0062] Reference Figure 1 and Figure 2 After determining the position where the steel sheet pile 1 needs to be inserted according to the shape and size of the required steel sheet pile cofferdam, the state of the steel sheet pile 1 is adjusted, and the position of the sliding member 41 is locked by the locking assembly 5. At this time, the locking member 51 is plugged into the locking groove 411 on the sliding member 41 through the locking portion 511, and the operating member 52 is inserted into the first socket 23; then, multiple steel sheet piles 1 are inserted into the soil in turn, and when another steel sheet pile 1 is inserted into one side of the steel sheet pile 1 inserted into the soil, the adjacent steel sheet piles 1 are snap-fitted to form a connection, until multiple steel sheet piles 1 are inserted into the soil and enclosed to form a steel sheet pile cofferdam.

[0063] S2. Construction is carried out in a space enclosed by a plurality of steel sheet piles 1.

[0064] Drainage, excavation of foundation pits and construction of buildings in the construction space within the steel sheet pile cofferdam.

[0065] S3. After the construction is completed, multiple steel sheet piles 1 are pulled out in sequence. When pulling out the steel sheet piles 1, the driving member 42 is first controlled to move upward by the sliding member 41, and multiple movable members 3 are sequentially driven from bottom to top to move in a direction away from the cavity 21, so as to loosen the soil on one side of the pile body 2 from bottom to top; then an upward force is applied to the pile body 2 by the driving member 42, so as to drive the pile body 2 to move upward and be pulled out of the soil.

[0066] Reference Figure 3 and Figure 6When removing the steel sheet pile cofferdam, first adjust the state of the plurality of steel sheet piles 1 so that the locking assembly 5 releases the sliding lock of the sliding member 41 relative to the pile body 2. At this time, a certain distance is maintained between the locking member 51 and the sliding member 41, and the operating member 52 is inserted into the second socket 24; then, pull out the plurality of steel sheet piles 1 from the soil in turn, apply force upward at the end of the sliding member 41 away from the driving member 42, and during the process of the driving member 42 moving upward, first drive the plurality of movable members 3 to move outward in turn from bottom to top. Loosen the soil and, at the same time, drive the gas in the cavity 21 to blow out through the gap to prevent external soil from entering, and then apply force to the pile body 2 to pull the pile body 2 out of the soil; when the pile body 2 cannot move upward with the driving member 42 due to excessive resistance from the soil, the driving member 42 will drive the abutment plate 81 to move upward to squeeze the airbag 7, and after the airbag 7 shrinks, it drives multiple sealing members 6 to expand, thereby driving multiple movable members 3 to move outward again to loosen the soil, until the pile body 2 can overcome the resistance of the soil and be pulled out.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steel sheet pile cofferdam, characterized in that: Comprising a plurality of steel sheet piles (1), wherein two of the steel sheet piles (1) are detachably connected; The steel sheet pile (1) comprises a pile body (2), a plurality of movable parts (3) and a control component (4); The pile body (2) is in the form of a rectangular plate as a whole and has a cavity (21) inside; The plurality of movable parts (3) are respectively arranged on one side of the pile body (2) in the thickness direction, and the movable parts (3) are movably connected to the pile body (2) in the thickness direction of the pile body (2); the movable part (3) has a force-bearing portion (31) at one end close to the pile body (2), and the force-bearing portion (31) has a wedge-shaped structure; when the movable part (3) moves to an extreme position in a direction close to the pile body (2), the force-bearing portion (31) is located in the cavity (21), and the surface of the movable part (3) is flush with the surface of the pile body (2); The control assembly (4) comprises a sliding member (41) and a driving member (42); the sliding member (41) is slidably connected to the pile body (2) along the length direction of the pile body (2), one end of the sliding member (41) is located in the cavity (21) and the other end is located outside the pile body (2); the driving member (42) is located in the cavity (21), the end of the sliding member (41) located in the cavity (21) is connected to the driving member (42), and the end of the driving member (42) close to the movable member (3) has a wedge-shaped structure; After the pile body (2) is inserted into the soil, the plurality of movable members (3) all move to an extreme position in a direction close to the pile body (2), the driving member (42) is located at the bottom of the cavity (21), and the end of the sliding member (41) away from the driving member (42) is located above the pile body (2); at this time, the sliding member (41) can slide upward to drive the driving member (42) to move upward, and during the upward movement of the driving member (42), the plurality of movable members (3) can be driven in sequence from bottom to top to move in a direction away from the cavity (21).

2. A steel sheet pile cofferdam according to claim 1, characterized in that: The steel sheet pile (1) further comprises a plurality of locking components (5), and the locking components (5) are arranged on an end of the pile body (2) through which the sliding member (41) passes; The locking assembly (5) comprises a locking member (51) which is movably connected to the pile body (2); an end of the locking member (51) close to the sliding member (41) has a locking portion (511), and a locking groove (411) matched with the locking portion (511) is formed on the sliding member (41); when the driving member (42) is located at an end of the cavity (21) away from the locking assembly (5), the locking portion (511) is aligned with the locking groove (411) along the movable direction of the locking member (51).

3. A steel sheet pile cofferdam according to claim 2, characterized in that: The locking assembly (5) further comprises an operating member (52); a first socket (23) and a second socket (24) for inserting the operating member (52) are provided on the pile body (2), and the first socket (23) and the second socket (24) both penetrate the pile body (2) in a direction away from the cavity (21) to form an opening; One end of the operating member (52) has a wedge-shaped structure, and a side of the locking member (51) facing away from the cavity (21) also has a wedge-shaped structure; when the locking member (51) moves to an extreme position in a direction away from the sliding member (41), the operating member (52) can be inserted into the first socket (23) to drive the locking member (51) to move in a direction close to the sliding member (41), so that the locking portion (511) can be inserted into the locking groove (411); when the locking portion (511) is plugged into the locking groove (411), the operating member (52) can be inserted into the second socket (24) to drive the locking member (51) to move to an extreme position in a direction away from the sliding member (41).

4. The steel sheet pile cofferdam according to claim 1, characterized in that: The steel sheet pile (1) further comprises a plurality of first elastic members (9), the two ends of each of which are respectively connected to the movable member (3) and the pile body (2), and are capable of driving the movable member (3) to move in a direction close to the cavity (21) to an extreme position and maintain the tendency thereof.

5. A steel sheet pile cofferdam according to claim 4, characterized in that: The driving member (42) forms a seal in the cavity (21), and when the movable member (3) moves in a direction away from the cavity (21) to an extreme position, a gap is formed between the movable member (3) and the pile body (2).

6. A steel sheet pile cofferdam according to claim 5, characterized in that: The steel sheet pile (1) further comprises a plurality of elastic sealing members (6), wherein the sealing members (6) are arranged on the pile body (2), and the plurality of sealing members (6) are respectively located around the plurality of movable members (3).

7. A steel sheet pile cofferdam according to claim 6, characterized in that: The steel sheet pile (1) further comprises an airbag (7), and the airbag (7) is arranged at an end of the cavity (21) close to an end of the sliding member (41) away from the driving member (42); The pile body (2) has a plurality of airflow channels (22) formed inside, the sealing member (6) has an air cavity (61) inside, and the two ends of the plurality of airflow channels (22) are respectively connected to the airbag (7) and the plurality of sealing members (6). When the sealing member (6) expands due to the inflation of the air cavity (61), the sealing member (6) can drive the adjacent movable member (3) to move in a direction away from the cavity (21).

8. The steel sheet pile cofferdam according to claim 7, characterized in that: When the force applied by the driving member (42) to the airbag (7) is greater than the gravity of the steel sheet pile (1) and exceeds a certain value, the airbag (7) is deformed by the force.

9. The steel sheet pile cofferdam according to claim 7, characterized in that: The steel sheet pile (1) further comprises a buffer component (8), wherein the buffer component (8) is arranged at one end of the cavity (21) close to the airbag (7); The buffer assembly (8) comprises an abutment plate (81) and a plurality of second elastic members (82); the abutment plate (81) is connected to the airbag (7) and is located between the airbag (7) and the driving member (42); two ends of the second elastic member (82) are respectively connected to the abutment plate (81) and the pile body (2), and has the function of driving the abutment plate (81) to move in a direction away from the airbag (7) to an extreme position and maintaining the position; when the abutment plate (81) moves in a direction away from the airbag (7) to an extreme position, the movable member (3) remains in a position state in which it moves to an extreme position close to the cavity (21).

10. A method for constructing a steel sheet pile cofferdam, used for constructing a steel sheet pile cofferdam as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Inserting a plurality of the steel sheet piles (1) in sequence so that adjacent steel sheet piles (1) are connected; when inserting the steel sheet piles (1), the steel sheet piles (1) are inserted into the soil in a position where the driving member (42) is located at the bottom of the cavity (21); Construction is performed in a space enclosed by a plurality of the steel sheet piles (1); After the construction is completed, the plurality of steel sheet piles (1) are pulled out in sequence. When the steel sheet piles (1) are pulled out, the driving member (42) is first controlled by the sliding member (41) to move upward, and the plurality of movable members (3) are sequentially driven from bottom to top to move in a direction away from the cavity (21), thereby loosening the soil on one side of the pile body (2) from bottom to top. Then, an upward force is applied to the pile body (2) by the driving member (42), thereby driving the pile body (2) to move upward and be pulled out of the soil.

Images