Waterproof and anti-seepage foundation pit steel cofferdam

Abstract

The present invention discloses a waterproof and anti-seepage foundation pit steel cofferdam, comprising a plurality of steel pipe piles connected end to end. The steel pipe piles comprise: a steel pipe pile body having a casting space therein; a notch structure comprising a pair of male notches and a pair of female notches; and a lock structure comprising a male lock head and a female lock head. The male lock head comprises a first extension plate, a first fixed shaft, a male locking block, and a male locking pin; and the female lock head comprises a second extension plate, a second fixed shaft, a female locking plate, and a female locking pin. The present invention can reduce the pile gap caused by the piling process, reduce the amount of waterproof concrete used, achieve good waterproof and anti-seepage effects, and improve construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering, and more particularly to a waterproof and anti-seepage steel cofferdam for a foundation pit. Background Art

[0002] The foundation pit is an underground space formed by excavating downward from the ground. When the foundation pit is excavated, since the groundwater level is higher than the bottom of the excavation, groundwater will continue to seep into the foundation pit. In order to ensure that the foundation pit can be constructed under dry conditions and to prevent slope instability, foundation sand flow, pit bottom uplift, pit bottom pipe burst and a decrease in foundation bearing capacity, a retaining structure needs to be set up. The retaining structure includes piles, walls, crown beams and other ancillary components. The pulling effect during the pile driving process during construction will cause a certain gap to form between the piles. In order to prevent groundwater leakage, waterproof bags are usually set on the outside of the retaining structure or concrete retaining walls are built. However, their height is limited and they cause pollution to the soil environment outside. Therefore, there is an urgent need for a retaining structure that can prevent groundwater from infiltrating the excavated foundation pit. Summary of the Invention

[0003] The present invention provides a waterproof and anti-seepage foundation pit steel cofferdam, which can reduce the pile gap caused by the piling process, reduce the usage of waterproof concrete, has good waterproof and anti-seepage effects, and improves construction efficiency.

[0004] In order to achieve these purposes and other advantages according to the present invention, a waterproof and anti-seepage foundation pit steel cofferdam is provided, comprising a plurality of steel pipe piles connected end to end, the steel pipe piles comprising:

[0005] The steel pipe pile body has a casting space inside;

[0006] A notch structure comprising a pair of male notches and a pair of female notches, wherein the pair of male notches are arranged one after the other on the downstream side of the steel pipe pile body, and the pair of female notches are arranged one after the other on the upstream side of the steel pipe pile body, wherein the pair of male notches of two adjacent steel pipe piles are respectively engaged with the pair of female notches, and a connecting chamber is formed between the pair of male notches and the pair of female notches, wherein the connecting chamber has a casting space inside.

[0007] The lock structure includes a male lock head and a female lock head, the male lock head includes a first extension plate, a first fixed shaft, a male lock block, and a male lock pin, the female lock head includes a second extension plate, a second fixed shaft, a female lock plate, and a female lock pin, the first extension plate and the second extension plate are arranged in front and behind and are respectively arranged on the downstream side and upstream side of the steel pipe pile body, the first fixed shaft and the second fixed shaft are respectively arranged on the first extension plate and the second extension plate, the male lock block is a "フ"-shaped structure, and one end of the male lock block is rotatably connected to the first fixed shaft through a bearing The male locking pin is fixedly arranged at the inner angle of the male locking block, and the other end of the male locking block is provided with a locking hook, and the female locking plate is vertically arranged on the second extension plate, and the female locking plate is provided with a locking mouth, and the size of the locking mouth is set: after the two adjacent steel pipe piles are flush, the other end of the male locking block passes through the locking mouth of the female locking plate, and the locking hook of the male locking block stops at the female locking plate, and the female locking pin is a "Z"-shaped structure, one end of the female locking pin is rotatably connected to the second fixed shaft through a bearing, and the other end of the female locking pin is detachably connected to the male locking pin through a connecting piece.

[0008] Preferably, a plurality of steel pipe piles connected end to end are enclosed to form a square steel cofferdam, wherein the steel pipe piles include linearly connected "O"-shaped side steel pipe piles and "L"-shaped angle steel pipe piles located at the corners.

[0009] Preferably, the length of the front male slot is smaller than that of the rear male slot, the length of the front female slot is larger than that of the rear female slot, the bending direction of the male slot is opposite to that of the female slot, and anti-seepage rubber strips are respectively provided in front of the shorter male slot and behind the shorter female slot.

[0010] Preferably, the connection chamber has a steel cage inside, the height of which is no higher than the locking structure.

[0011] Preferably, the steel cage is formed by binding the top corners of two steel cages with stirrups.

[0012] Preferably, the male locking block is further provided with a barb, and after two adjacent steel pipe piles are aligned, the locking hook and barb of the male locking block are respectively located on the downstream side and upstream side of the locking opening, and the barb of the male locking block is stopped by the female locking plate.

[0013] The present invention has at least the following beneficial effects:

[0014] First, the steel pipe piles of the present invention are connected end to end, and the bite connection is achieved through the groove structure, and the locking connection is achieved through the lock structure. The underground continuous wall is formed by pouring concrete inside the steel pipe pile body and the connection chamber. Compared with pouring concrete outside the steel cofferdam, the pouring amount of concrete is reduced, and it has good waterproof and anti-seepage effects, reduces pollution to the environment, and improves construction efficiency.

[0015] Second, there is no restriction on the shape of the steel pipe pile body, as long as it has a closed space, such as square or round. The extension plate on the downstream side of the steel pipe pile body is provided with a pair of male notches, and the extension plate on the upstream side is provided with a pair of female notches. The shapes of the male notches and the female notches match. The pair of male notches and the pair of female notches of adjacent steel pipe pile bodies are buckled and connected during the piling process. Concrete can be poured inside the connection chamber, which isolates both the inside and the outside of the steel cofferdam.

[0016] Third, the male lock head and the female lock head are located inside the connecting chamber between the male notch and the female notch, and the height of the male lock head and the female lock head is located at the upper part of the steel pipe pile body, which is convenient for further locking in the final stage of piling. The first extension plate and the second extension plate are arranged parallel to the male notch and the female notch, and a first fixed axis is arranged on the first extension plate, and the male locking block is an irregular eccentric structure. A male locking pin is arranged at the inner angle of the male locking block, and when the male locking pin is subjected to external force, it drives the male locking block to rotate around the first fixed axis, and the locking hook of the male locking pin moves clockwise. The locking hook can be a curved hook structure, and a second fixed axis is arranged on the second extension plate. When the female locking pin is subjected to external force, it can rotate around the second fixed axis, and a locking port is arranged on the female locking plate, which can be used for the male locking pin to pass through when it moves clockwise. After passing through, due to the design of the locking hook, it cannot be reset by counterclockwise reverse movement.

[0017] Fourth, when using the present invention, the steel pipe piles are installed in sequence by piling from the upstream side to the downstream side. When piling, the male notch of the steel pipe pile body to be installed on the downstream side is aligned with the female notch of the installed steel pipe pile body on the upstream side. When piling to the second extension plate close to the first extension plate, a connecting piece is used to connect the female locking pin and the male locking pin, for example, through a connecting tube, or by an embedded plug-in connection, and then the piling is continued. The second extension plate continues to descend, and the female locking pin drives the male locking pin to move, thereby driving the male locking block to rotate around the first fixed axis until the steel pipe pile body to be installed on the downstream side is in place, that is, the adjacent steel pipe pile bodies are flush in height, the other end of the male locking block passes through the locking mouth, and the locking mouth stops at the female locking plate to achieve locking, and the next step of pouring can be carried out.

[0018] Fifth, the steel cofferdam is designed to be square to facilitate closed maintenance conditions for the foundation pit. The U-shaped side steel pipe piles can be connected one by one through a notch structure and a lock structure. The L-shaped angle steel pipe piles at the corners connect the two perpendicular side steel pipe piles to further ensure the water-stopping effect of the corners. The length design of the male and female notches notches not only facilitates the prefabrication of steel pipe piles of the same model and specifications, but also forms staggered connection points, improving the anti-seepage effect of the steel cofferdam. The anti-seepage rubber strips are designed in the shorter male and female notches to form a double-layer anti-seepage structure. The design of the steel cage can further improve the mechanical strength, thereby improving the closed sealing effect. The steel cage can be hoisted by roughly lowering it and then accurately positioning it before piling. Specifically, the steel cage and the female lock of the installed steel pipe pile body on the upstream side are staggered and lowered. After the steel cage is lowered to the bottom, it is moved horizontally to the inside of the connection chamber. Then, the male notch of the steel pipe pile body to be installed on the downstream side is aligned with the female notch of the installed steel pipe pile body on the upstream side and piled. The top corners of the two steel cages are tied so that the two steel cages fill the entire connection chamber, improving the pouring effect. The male locking block is equipped with a barb. After the male locking pin moves clockwise through the locking mouth, due to the design of the locking hook, it cannot be reset by moving counterclockwise. Due to the design of the barb, it cannot continue to move clockwise, further achieving the locking effect.

[0019] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a technical solution of the present invention;

[0021] Figure 2 This is a structural schematic diagram of a working state of the lock structure of the present invention;

[0022] Figure 3 This is a structural schematic diagram of another working state of the lock structure of the present invention;

[0023] Figure 4 This is a schematic structural diagram of the male lock head of the present invention;

[0024] Figure 5 This is a schematic structural diagram of the female lock of the present invention;

[0025] Figure 6 This is a schematic diagram of the locking structure of the male locking pin and the female locking pin according to the present invention. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0027] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0028] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] like Figure 1-6 As shown, the present invention provides a waterproof and anti-seepage foundation pit steel cofferdam, including a plurality of steel pipe piles connected end to end, the steel pipe piles comprising:

[0030] The steel pipe pile body 1 has a pouring space inside;

[0031] The notch structure includes a pair of male notches 2 and a pair of female notches 3. The pair of male notches 2 are arranged one after the other on the downstream side of the steel pipe pile body 1, and the pair of female notches 3 are arranged one after the other on the upstream side of the steel pipe pile body 1. The pair of male notches 2 of two adjacent steel pipe piles are respectively engaged with the pair of female notches 3. A connecting chamber is formed between the pair of male notches 2 and the pair of female notches 3, and the interior of the connecting chamber has a casting space.

[0032] The lock mouth 13 structure includes a male lock head 4 and a female lock head 5. The male lock head 4 includes a first extension plate 6, a first fixed shaft 7, a male lock block 8, and a male lock pin 9. The female lock head 5 includes a second extension plate 10, a second fixed shaft, a female lock plate 12, and a female lock pin 11. The first extension plate 6 and the second extension plate 10 are arranged one after the other and are respectively arranged on the downstream side and the upstream side of the steel pipe pile body 1. The first fixed shaft 7 and the second fixed shaft are respectively arranged on the first extension plate 6 and the second extension plate 10. The male lock block 8 is a "フ"-shaped structure. One end of the male lock block 8 is rotatably connected to the first fixed shaft 7 through a bearing. The male locking pin 9 is fixedly set at the inner angle of the male locking block 8, and the other end of the male locking block 8 is provided with a locking hook 14. The female locking plate 12 is vertically arranged on the second extension plate 10, and the female locking plate 12 is provided with a locking mouth 13. The size of the locking mouth 13 is set as follows: after two adjacent steel pipe piles are flush, the other end of the male locking block 8 passes through the locking mouth 13 of the female locking plate 12, and the locking hook 14 of the male locking block 8 is stopped by the female locking plate 12, and the female locking pin 11 is a "Z"-shaped structure. One end of the female locking pin 11 is rotatably connected to the second fixed shaft through a bearing, and the other end of the female locking pin 11 is detachably connected to the male locking pin 9 through a connecting piece.

[0033] In the above technical solution, the steel pipe piles of the present invention are connected end to end, and the bite connection is achieved through the groove structure, and the locking connection is achieved through the lock 13 structure. An underground continuous wall is formed by pouring concrete inside the steel pipe pile body 1 and inside the connection chamber. Compared with pouring concrete outside the steel cofferdam, the amount of concrete poured is reduced, and it has good waterproof and anti-seepage effects, reduces pollution to the environment, and improves construction efficiency.

[0034] There is no restriction on the shape of the steel pipe pile body 1, as long as it has a closed space, such as a square or round shape. The extension plate on the downstream side of the steel pipe pile body 1 is provided with a pair of male slots 2, and the extension plate on the upstream side is provided with a pair of female slots 3. The shapes of the male slots 2 and the female slots 3 match. The pair of male slots 2 and the pair of female slots 3 of the adjacent steel pipe pile bodies 1 are buckled and connected during the piling process. Concrete can be poured inside the connection chamber, which isolates both the inside and the outside of the steel cofferdam.

[0035] The male lock head 4 and the female lock head 5 are located inside the connecting chamber between the male notch 2 and the female notch 3. The height of the male lock head 4 and the female lock head 5 is located at the upper part of the steel pipe pile body 1, which is convenient for further locking in the final stage of piling. The first extension plate 6 and the second extension plate 10 are arranged parallel to the male notch 2 and the female notch 3. A first fixed axis 7 is arranged on the first extension plate 6, and the male locking block 8 is an irregular eccentric structure. A male locking pin 9 is arranged at the inner angle of the male locking block 8. When the male locking pin 9 is subjected to external force, it drives the male locking block 8 to rotate around the first fixed axis 7, and the locking hook 14 of the male locking pin 9 moves clockwise. The locking hook 14 can be a curved hook structure. A second fixed axis is arranged on the second extension plate 10. When the female locking pin 11 is subjected to external force, it can rotate around the second fixed axis. A locking port 13 is arranged on the female locking plate 12. The locking port 13 can be used for the male locking pin 9 to pass through when it moves clockwise. After passing through, due to the design of the locking hook 14, it cannot be reset by counterclockwise reverse movement.

[0036] When using the present invention, steel pipe piles are installed from the upstream side to the downstream side by piling. When piling, the male groove 2 of the steel pipe pile body 1 to be installed on the downstream side is aligned with the female groove 3 of the installed steel pipe pile body 1 on the upstream side. When piling to the second extension plate 10 close to the first extension plate 6, a connecting piece is used to connect the female locking pin 11 to the male locking pin 9, for example, through a connecting tube, or by an embedded plug-in connection, and then the piling is continued. The second extension plate 10 continues to descend, and the female locking pin 11 drives the male locking pin 9 to move, thereby driving the male locking block 8 to rotate around the first fixed axis 7 until the steel pipe pile body 1 to be installed on the downstream side is in place, that is, the adjacent steel pipe pile bodies 1 are flush in height, and the other end of the male locking block 8 passes through the locking port 13, and the locking port 13 stops at the female locking plate 12 to achieve locking, and the next step of pouring can be carried out.

[0037] In another technical solution, a square steel cofferdam is formed by connecting several steel pipe piles end to end. These steel pipe piles include linearly connected "U"-shaped side steel pipe piles and "L"-shaped angle steel pipe piles located at the corners. The square steel cofferdam design facilitates closed maintenance conditions for the foundation pit. The "U"-shaped side steel pipe piles can be connected one by one through a notch structure and a lock structure 13. The L-shaped angle steel pipe piles at the corners connect the two perpendicular side steel pipe piles to further ensure the water-stopping effect at the corners.

[0038] In another technical solution, the length of the front male notch 2 is shorter than that of the rear male notch 2, the length of the front female notch 3 is longer than that of the rear female notch 3, the bending direction of the male notch 2 is opposite to that of the female notch 3, and an anti-seepage rubber strip is provided in front of the shorter male notch 2 and behind the shorter female notch 3. The length design of the male and female notches 2 and 3 facilitates the prefabrication of steel pipe piles of the same model and specifications, and also forms staggered connection points, thereby improving the anti-seepage effect of the steel cofferdam. The anti-seepage rubber strips are designed at the shorter male and female notches 2 and 3 to form a double-layer anti-seepage structure.

[0039] In another technical solution, the interior of the connecting chamber is provided with a steel cage, the height of which is no higher than the structure of the lock opening 13. The design of the steel cage can further improve the mechanical strength, thereby improving the closing and sealing effect.

[0040] In another technical solution, the steel cage is formed by the top corners of two steel cages tied with stirrups. The steel cage can be hoisted and lowered roughly before pile driving, specifically by lowering the steel cage and the female lock head 5 of the installed steel pipe pile body 1 on the upstream side, staggering them and lowering them. After the steel cage is lowered to the bottom, it is moved horizontally into the connection chamber. Then, the male notch 2 of the steel pipe pile body 1 to be installed on the downstream side is aligned with the female notch 3 of the installed steel pipe pile body 1 on the upstream side, and the piles are driven. The top corners of the two steel cages are tied so that the two cages fill the entire connection chamber, improving the pouring effect.

[0041] In another technical solution, the male locking block 8 is further provided with a barb 15. When two adjacent steel pipe piles are aligned, the locking hook 14 and the barb 15 of the male locking block 8 are respectively located on the downstream and upstream sides of the locking opening 13, and the barb 15 of the male locking block 8 is stopped by the female locking plate 12. The male locking block 8 is provided with the barb 15. After the male locking pin 9 moves clockwise through the locking opening 13, due to the design of the locking hook 14, it cannot move counterclockwise to reset, and due to the design of the barb 15, it cannot continue to move clockwise, thereby further achieving a locking effect.

[0042] The number of devices and processing scales described herein are intended to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be readily apparent to those skilled in the art.

[0043] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A waterproof and anti-seepage foundation pit steel cofferdam, comprising a number of steel pipe piles connected end to end, characterized in that: The steel pipe pile comprises: The steel pipe pile body has a casting space inside; A notch structure comprising a pair of male notches and a pair of female notches, wherein the pair of male notches are arranged one after the other on the downstream side of the steel pipe pile body, and the pair of female notches are arranged one after the other on the upstream side of the steel pipe pile body, wherein the pair of male notches of two adjacent steel pipe piles are respectively engaged with the pair of female notches, and a connecting chamber is formed between the pair of male notches and the pair of female notches, wherein the connecting chamber has a casting space inside. The lock structure includes a male lock head and a female lock head, the male lock head includes a first extension plate, a first fixed shaft, a male lock block, and a male lock pin, the female lock head includes a second extension plate, a second fixed shaft, a female lock plate, and a female lock pin, the first extension plate and the second extension plate are arranged in front and behind and are respectively arranged on the downstream side and upstream side of the steel pipe pile body, the first fixed shaft and the second fixed shaft are respectively arranged on the first extension plate and the second extension plate, the male lock block is a "フ"-shaped structure, and one end of the male lock block is rotatably connected to the first fixed shaft through a bearing The male locking pin is fixedly arranged at the inner angle of the male locking block, and the other end of the male locking block is provided with a locking hook, and the female locking plate is vertically arranged on the second extension plate, and the female locking plate is provided with a locking mouth, and the size of the locking mouth is set: after the two adjacent steel pipe piles are flush, the other end of the male locking block passes through the locking mouth of the female locking plate, and the locking hook of the male locking block stops at the female locking plate, and the female locking pin is a "Z"-shaped structure, one end of the female locking pin is rotatably connected to the second fixed shaft through a bearing, and the other end of the female locking pin is detachably connected to the male locking pin through a connecting piece.

2. The waterproof and anti-seepage foundation pit steel cofferdam according to claim 1, characterized in that: A number of steel pipe piles connected end to end form a square steel cofferdam. The steel pipe piles include linearly connected "O"-shaped side steel pipe piles and "L"-shaped angle steel pipe piles located at the corners.

3. The waterproof and anti-seepage foundation pit steel cofferdam according to claim 1, characterized in that: The length of the front male slot is shorter than that of the rear male slot, the length of the front female slot is longer than that of the rear female slot, the bending direction of the male slot is opposite to that of the female slot, and anti-seepage rubber strips are respectively provided in front of the shorter male slot and behind the shorter female slot.

4. The waterproof and anti-seepage foundation pit steel cofferdam according to claim 1, characterized in that: The interior of the connecting chamber is provided with a steel cage, the height of which is no higher than the locking structure.

5. The waterproof and anti-seepage foundation pit steel cofferdam according to claim 4, characterized in that: The steel cage is formed by binding the top corners of two steel cages with stirrups.

6. The waterproof and anti-seepage foundation pit steel cofferdam according to claim 1, characterized in that: The male locking block is also provided with a barb. After two adjacent steel pipe piles are aligned, the lock hook and barb of the male locking block are respectively located on the downstream side and upstream side of the lock mouth, and the barb of the male locking block is stopped by the female locking plate.

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