A telescopic interlocking steel pipe pile structure for cofferdam closure and its working method

Abstract

This invention discloses a telescopic interlocking steel pipe pile structure and its working method for cofferdam closure. The structure includes a steel pipe pile and interlocking fasteners. The steel pipe pile is a hollow tube. The interlocking fasteners themselves can move radially within the steel pipe pile. A limiting bolt is provided on the interlocking fasteners, which can slide and lock radially within the steel pipe pile. The interlocking fasteners are rotatable within the steel pipe pile around the limiting bolts and are secured to the steel pipe pile. A first Larssen fastener is fixedly installed on the outer circumferential wall of the steel pipe pile. Cofferdam closure is achieved by connecting the first and second Larssen fasteners to the steel pipe piles. The beneficial effects of this invention are: by adjusting the movement distance of the interlocking fasteners in the radial direction of the steel pipe piles, other steel pipe piles can be connected to the first and second Larssen fasteners to achieve smooth cofferdam closure; furthermore, by adjusting the position of the limiting bolts before the interlocking fasteners are driven in, the interlocking fasteners can be easily positioned before driving.

Description

Technical Field

[0001] This invention relates to the field of bridge cofferdam construction technology, specifically to a telescopic steel pipe pile structure for cofferdam closure and its working method. Background Technology

[0002] During the construction of interlocking steel cofferdams, the difficulty in controlling underwater conditions, uneven foundations, and construction errors often lead to significant closure errors. Improper handling of the closure position can easily result in water leakage and poor stability during bridge foundation construction, ultimately affecting construction safety. Currently, two common construction methods are used in China to address errors in interlocking steel pipe piles. The first method involves strictly controlling the verticality and position of the interlocking steel pipe piles during driving to ensure the closure error meets construction requirements. The second method involves designing irregularly shaped rigid pipe piles or sheet piles based on the gap condition and error value during closure, ensuring successful closure of the steel cofferdam.

[0003] Among the aforementioned construction methods, the first approach strictly controls construction errors during the construction process to ensure smooth closure of the cofferdam. However, in actual construction, various factors such as riverbed geological conditions, construction machinery, and operators make error control difficult. Even if the construction error of a single steel pipe pile is within the required range, the cumulative error often fails to meet the construction requirements at the time of closure. The second approach requires measuring the closure point after the other steel pipe piles are driven before processing irregularly shaped piles. However, since bridge projects are often located in remote areas, the construction site generally lacks processing facilities, requiring custom processing in a factory. This can lead to temporary work stoppages and, with changes in river water conditions, can easily cause cofferdam deformation, posing a safety hazard. Therefore, designing a pre-processable, simple, and feasible interlocking steel pipe pile is an urgent problem that technical personnel in related fields need to solve. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the existing construction of cofferdam closure using interlocked steel pipe piles will produce large errors. The purpose of this invention is to provide a telescopic interlocked steel pipe pile structure and its working method for cofferdam closure. By moving the locking fastener in the radial direction of the steel pipe pile, the distance between the last one or several steel pipe piles at the closure joint can be adjusted. In addition, before the driving of this interlocked steel pipe pile structure, the position of the limiting bolt can be adjusted to facilitate the pre-driving positioning. After positioning, the limiting bolt is loosened to start the driving construction and complete the cofferdam closure.

[0005] This invention is achieved through the following technical solution:

[0006] A telescopic interlocking steel pipe pile structure for cofferdam closure includes:

[0007] Steel pipe piles, wherein the steel pipe piles are hollow pipes;

[0008] The locking element is movable in the radial direction of the steel pipe pile. The locking element is inserted into the steel pipe pile in a radially movable manner. The locking element is provided with a limit bolt. The limit bolt can slide and lock in the radial direction of the steel pipe pile. The locking element is inserted into the steel pipe pile in a rotatable manner around the limit bolt. The locking element is locked onto the steel pipe pile.

[0009] The first Larsen fastener is fixedly installed on the outer peripheral wall of the steel pipe pile;

[0010] Before the steel cofferdam of the lock-joint steel pipe pile structure is closed, adjust the position of the limiting bolt sliding in the radial direction of the steel pipe pile, lock the limiting bolt, measure the top distance between the top of the steel pipe pile and the top of the locking fastener, so that the locking fastener can be in place before being inserted into the steel pipe pile. After the locking fastener is in place, loosen the limiting bolt, and the locking fastener can be inserted into the steel pipe pile.

[0011] When the steel cofferdam of the lock-joint steel pipe pile structure is closed, the adjusting locking fastener on the outside of the steel pipe pile is connected to the steel pipe pile by adjusting the movement distance of the locking fastener in the radial direction of the steel pipe pile, so as to realize the smooth closure of the steel cofferdam of the lock-joint steel pipe pile structure.

[0012] Optionally, the steel pipe pile has multiple vertical openings on its sidewall, which are arranged in an array along the axial direction of the steel pipe pile. The locking fastener passes through the vertical openings and is inserted into the interior of the steel pipe pile.

[0013] Optionally, the locking element includes a steel plate, a bent buckle, and a second Larsen buckle;

[0014] The number of steel plates is multiple, and the steel plates are arranged in an array along the length direction of the second Larsen buckle. The second Larsen buckle is strip-shaped. The bending buckle and the second Larsen buckle are located at the left and right ends of the steel plate, respectively. The steel plate is inserted into the vertical opening of the steel pipe pile, the bending buckle is locked in the steel pipe pile, and the second Larsen buckle is fastened to the first Larsen buckle.

[0015] Optionally, the width of the bent buckle is greater than the width of the vertical opening, and the width of the bent buckle is greater than three times the width of the vertical opening.

[0016] Optionally, the bending angle of the bending buckle is less than 80°, and the bending buckle is used to prevent the locking element from detaching from the steel pipe pile.

[0017] Optionally, a rectangular opening is provided on the steel plate at the bottom of the locking member, the length direction of the rectangular opening being set from the bent buckle to the second Larsen buckle, and the rectangular opening is located on the lower side of the steel plate.

[0018] Optionally, the limiting bolt is inserted into the rectangular opening, and the limiting bolt can slide and lock within the rectangular opening along the length direction of the rectangular opening.

[0019] Optionally, the locking fastener and the first Larsen fastener are arranged symmetrically about the axis of the steel pipe pile.

[0020] Optionally, the locking element and the first Larsen buckle are on the same plane.

[0021] A working method for a telescopic interlocking steel pipe pile structure used for cofferdam closure includes the following steps:

[0022] Step 1): Arrange multiple steel plates in an array along the length of the second Larssen buckle, and weld the multiple steel plates to the second Larssen buckle;

[0023] Step 2): Weld the other side of each steel plate to the bending buckle to form a locking fastener, insert the locking fastener into the steel pipe pile (1), and weld the first Larsen buckle on the opposite side of the locking fastener. The steel pipe pile, the locking fastener and the first Larsen buckle together form a telescopic locking steel pipe pile structure.

[0024] Step 3): Before the steel cofferdam of the lock-lock steel pipe pile structure is closed, measure the top distance between the top of the first Larsen buckle on one side of the steel pipe pile and the top of the locking member on the opposite side of the first Larsen buckle. Move the locking member in the radial direction of the steel pipe pile and then fix the limiting bolt. After the second Larsen buckle is inserted into the vertical opening of the steel pipe pile, loosen the limiting bolt and then insert the locking member (2) into the steel pipe pile.

[0025] Step 4): After the driving is completed, clay can be backfilled inside the steel pipe piles, and the joint between the steel pipe piles and the steel plate can be sealed by welding to prevent water from outside the cofferdam from seeping into the steel pipe piles of the cofferdam.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] 1. The locking member of this invention is movable in the radial direction of the steel pipe pile. The locking member is radially inserted into the interior of the steel pipe pile. A limiting bolt is provided on the locking member, which can slide and lock in the radial direction of the steel pipe pile. The length of the locking member inserted into the steel pipe pile can be adjusted by the limiting bolt. The locking member is secured to the steel pipe pile. The first Larsen fastener is fixedly installed on the outer peripheral wall of the steel pipe pile. When the steel cofferdam is closed, the steel pipe piles on both sides of the closure opening are connected through this locking steel pipe pile structure by adjusting the movement distance of the locking member in the radial direction of the steel pipe pile, thereby achieving smooth closure of the steel pipe pile cofferdam. Furthermore, before driving the pile, the position of the limiting bolt can be adjusted to facilitate pre-driving positioning.

[0028] 2. The limiting bolt of the present invention is set in a rectangular opening. The limiting bolt can slide along the length direction of the rectangular opening and is then locked to the steel plate. By adjusting the position of the limiting bolt in the rectangular opening, the exposed length of the bottom of the locking element can be adjusted, which can limit the movement before construction and facilitate construction.

[0029] 3. The present invention has a simple structure and is easy to process. The steel pipe pile and the telescopic locking buckle are separate structures, which are easy to replace, greatly improving the effective utilization rate of materials, saving engineering materials, and reducing construction costs. The present invention can be processed before the cofferdam is closed, avoiding the need to measure the closure position and then process the locking steel pipe pile before the closure, thus ensuring the safety of engineering construction and shortening the construction period. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0031] Figure 1 This is a front view of the overall structure of the present invention;

[0032] Figure 2 This is a top view of the overall structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the steel pipe pile structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the locking mechanism structure of the present invention;

[0035] Figure 5 This is a partial structural schematic diagram of the locking element of the present invention;

[0036] Figure 6 This is a partial structural schematic diagram of the locking element of the present invention;

[0037] Figure 7 This is a schematic diagram of the Larsen buckle structure of the present invention;

[0038] Figure 8 This is a schematic diagram of the cofferdam closure structure of the present invention.

[0039] Attached reference numerals: 1. Steel pipe pile; 1.1. Vertical opening; 2. Locking fastener; 2.1. Steel plate; 2.1.1. Bending buckle; 2.2. Second Larssen fastener; 2.3. Rectangular opening; 2.4. Limiting bolt; 3. First Larssen fastener Detailed Implementation

[0040] In the description of this invention, the terms "front," "rear," "left," "right," "up," "down," "vertical," "horizontal," "high," "low," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0041] like Figure 1-2 As shown, this embodiment provides a telescopic interlocking steel pipe pile structure for cofferdam closure, including a steel pipe pile 1 and a locking fastener 2. The steel pipe pile 1 is a hollow pipe, and the locking fastener 2 itself can move in the radial direction of the steel pipe pile 1. The locking fastener 2 is inserted into the interior of the steel pipe pile 1 in a radially movable manner. A limit bolt 2.4 is provided on the locking fastener 2. The limit bolt 2.4 can slide and lock in the radial direction of the steel pipe pile 1. The length of the locking fastener 2 inserted into the interior of the steel pipe pile 1 can be adjusted by the limit bolt 2.4. The locking fastener 2 is locked on the steel pipe pile 1, and a first Larssen fastener 3 is fixedly set on the outer peripheral wall of the steel pipe pile 1.

[0042] During the closure of the steel cofferdam, the spacing of the locking fasteners 2 in the radial direction of the steel pipe piles 1 is adjusted to connect the two sides of the steel pipe pile 1 at the closure opening of the steel cofferdam, i.e., the two sides of the locking steel pipe pile structure, through this locking steel pipe pile structure, so as to achieve the smooth closure of the steel pipe pile 1 cofferdam. In addition, before the driving of the locking fasteners 2, the position of the limiting bolts 2.4 is adjusted to facilitate the positioning of the locking fasteners 2 before driving.

[0043] The first Larsen fastener 3 and the second Larsen fastener 2.2 are connected to the locking steel pipe piles 1 on both sides of the locking steel pipe pile structure at the closure joint of the steel cofferdam (e.g., ...). Figure 8 As shown in the figure, the cofferdam structure was successfully closed.

[0044] like Figure 3 As shown, the steel pipe pile 1 has multiple vertical openings 1.1 on its side wall. The vertical openings 1.1 are arranged in an array along the axial direction of the steel pipe pile 1. The locking fastener 2 passes through the vertical openings 1.1 and is inserted into the interior of the steel pipe pile 1. The locking fastener 2 can move radially within the vertical openings 1.1.

[0045] like Figure 4-5 As shown, the locking fastener 2 includes a steel plate 2.1, a bent buckle 2.1.1, and a second Larsen buckle 2.2 (as shown). Figure 7 (as shown);

[0046] There are multiple steel plates 2.1, which are arranged in an array along the length of the second Larssen buckle 2.2. The second Larssen buckle 2.2 is strip-shaped. The bent buckle 2.1.1 and the second Larssen buckle 2.2 are located at the left and right ends of the steel plate 2.1, respectively. The steel plate 2.1 is inserted into the vertical opening 1.1 of the steel pipe pile 1, and the bent buckle 2.1.1 is locked inside the steel pipe pile 1. The steel plate 2.1 is connected to the locking steel pipe pile 1 on both sides of the locking steel pipe pile structure of the steel cofferdam closure joint through the first Larssen buckle 3 and the second Larssen buckle 2.2, so as to realize the closure of the cofferdam structure.

[0047] The width of the bent buckle 2.1.1 is greater than the width of the vertical opening 1.1, and the width of the bent buckle 2.1.1 is greater than three times the length of the vertical opening 1.1. The bent buckle 2.1.1 can prevent the locking element 2 from coming out of the steel pipe pile 1, that is, the bending angle of the bent buckle 2.1.1 is less than 80°, and the bent buckle 2.1.1 abuts against the inner wall of the steel pipe pile 1.

[0048] like Figure 6 As shown, a rectangular opening 2.3 is provided on the steel plate 2.1 at the bottom of the locking fastener 2. The length direction of the rectangular opening 2.3 is set from the bent buckle 2.1.1 to the second Larsen buckle 2.2. The rectangular opening 2.3 is located on the lower side of the steel plate 2.1.

[0049] A limiting bolt 2.4 is inserted into the rectangular opening 2.3. The limiting bolt 2.4 can slide and lock within the rectangular opening 2.3 along the length of the rectangular opening 2.3.

[0050] The locking fastener 2 and the first Larssen fastener 3 are symmetrically arranged about the axis of the steel pipe pile 1, and the locking fastener 2 and the first Larssen fastener 3 are on the same plane.

[0051] Example 2

[0052] Based on Embodiment 1, this embodiment provides a working method for a telescopic interlocking steel pipe pile structure used for cofferdam closure, including the following steps:

[0053] Step 1): Arrange multiple steel plates 2.1 in an array along the length of the second Larssen buckle 2.2, and weld the multiple steel plates 2.1 to the second Larssen buckle 2.2;

[0054] Step 2): Weld the other side of each steel plate 2.1 to the bending buckle 2.1.1 to form a locking member 2. Insert the locking member 2 into the steel pipe pile 1. Weld the first Larsen buckle 3 on the opposite side of the locking member 2. The steel pipe pile 1, the locking member 2 and the first Larsen buckle 3 together form a telescopic locking steel pipe pile structure.

[0055] Step 3): Before the steel cofferdam of the interlocking steel pipe pile structure is closed, measure the top distance between the top of the first Larssen buckle 3 on one side of the steel pipe pile 1 and the top of the locking member 2 on the opposite side of the first Larssen buckle 3. Move the locking member 2 in the radial direction of the steel pipe pile 1 and then fix the limiting bolt 2.4. After the second Larssen buckle 2.2 is inserted into the vertical opening 1.1 of the steel pipe pile 1, loosen the limiting bolt 2.4 and then insert the locking member 2 into the steel pipe pile 1.

[0056] Step 4): After the driving is completed, clay can be backfilled inside the steel pipe pile 1, and the joint between the steel pipe pile 1 and the steel plate 2.1 can be sealed by welding to prevent water from outside the cofferdam from seeping into the steel pipe pile 1 of the cofferdam.

[0057] By adjusting the movement distance of the locking fastener 2 in the radial direction of the steel pipe pile 1, the steel pipe piles 1 on both sides of the steel cofferdam closure opening are connected through this locking steel pipe pile structure to achieve the smooth closure of the steel pipe pile cofferdam.

[0058] Furthermore, the limiting bolt 2.4 is locked onto the steel plate 2.1 at the bottom of the locking fastener 2. The limiting bolt 2.4 abuts against the outer wall of a steel pipe pile 1. Before the driving construction, the position of the limiting bolt 2.4 is adjusted to facilitate the locking fastener 2 to be in place before driving. After the locking fastener 2 is in place, the limiting bolt 2.4 is loosened to start the driving construction and complete the closure.

[0059] Example 3

[0060] Based on Examples 1-2, such as Figure 1 , 6 As shown, the limiting bolt 2.4 is set inside the rectangular opening 2.3. The limiting bolt 2.4 can slide along the length direction of the rectangular opening 2.3. The limiting bolt 2.4 is then locked onto the steel plate 2.1. The relative position and angle between the locking fastener 2 and the steel pipe pile 1 are different depending on the position of the limiting bolt 2.4 inside the rectangular opening 2.3.

[0061] When the limiting bolt 2.4 is close to the bending buckle 2.1.1, the locking part 2 is inserted into the steel pipe pile 1 by a large length;

[0062] When the limiting bolt 2.4 is close to the second Larsen buckle 2.2, the length of the locking fastener 2 inserted into the steel pipe pile 1 is relatively small.

[0063] Example 4

[0064] Based on all the above embodiments, the steel pipe pile 1 is a hollow steel pipe with vertical openings 1.1 set at fixed intervals in the pile body. The spacing and length between the two vertical openings 1.1 are determined according to the length of the steel pipe pile 1.

[0065] Steel plate 2.1 is an ordinary steel plate that matches the vertical opening 1.1. The first Larssen buckle 3 is welded to the outer peripheral wall of the steel pipe pile 1. Steel plate 2.1 is welded to the second Larssen buckle 2.2. The limiting bolt 2.4 is an ordinary bolt installed in the rectangular opening 2.3. Larssen buckle 3 is an ordinary Larssen buckle.

[0066] Furthermore, the movable and telescopic locking element 2 is partially installed inside the steel pipe pile 1, forming a component that can move radially and telescopically. The bending buckle 2.1.1 can prevent the locking element 2 from detaching from the steel pipe pile 1.

[0067] Furthermore, a limiting bolt 2.4 is provided at the bottom of the movable locking component 2, which cooperates with the rectangular opening 2.3 to limit the insertion of the locking component 2 into the steel pipe pile 1. This limits the insertion of the locking component 2 before construction and facilitates construction.

[0068] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A telescopic interlocking steel pipe pile structure for cofferdam closure, characterized in that, include: Steel pipe pile (1), wherein the steel pipe pile (1) is a hollow pipe; The locking fastener (2) is capable of moving in the radial direction of the steel pipe pile (1). The locking fastener (2) is radially movable and inserted into the interior of the steel pipe pile (1). The locking fastener (2) is provided with a limiting bolt (2.4). The limiting bolt (2.4) can slide and lock in the radial direction of the steel pipe pile (1). The locking fastener (2) is rotatable around the limiting bolt (2.4) and inserted into the interior of the steel pipe pile (1). The locking fastener (2) is locked onto the steel pipe pile (1). The first Larsen buckle (3) is fixedly installed on the outer peripheral wall of the steel pipe pile (1); Before the steel cofferdam of the lock-joint steel pipe pile structure is closed, adjust the position of the limiting bolt (2.4) sliding in the radial direction of the steel pipe pile (1), lock the limiting bolt (2.4), measure the top distance between the top of the steel pipe pile (1) and the top of the locking fastener (2) so that the locking fastener (2) can be in place before being driven into the steel pipe pile (1). After the locking fastener (2) is connected to the first Larsen buckle (3) on the adjacent steel pipe pile (1) and in place, loosen the limiting bolt (2.4), start the driving construction and complete the closure. When the steel cofferdam of the lock-joint steel pipe pile structure is closed, the adjusting locking fastener (2) on the outside of the steel pipe pile (1) is connected to the adjacent steel pipe pile (1) by adjusting the movement distance of the locking fastener (2) in the radial direction of the steel pipe pile (1), so as to realize the smooth closure of the steel cofferdam of the lock-joint steel pipe pile structure.

2. The telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 1, characterized in that, The steel pipe pile (1) has multiple vertical openings (1.1) on its side wall. The vertical openings (1.1) are arranged in an array along the axial direction of the steel pipe pile (1). The locking fastener (2) passes through the vertical openings (1.1) and is inserted into the interior of the steel pipe pile (1).

3. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 2, characterized in that, The locking element (2) includes a steel plate (2.1), a bent buckle (2.1.1), and a second Larsen buckle (2.2); The number of steel plates (2.1) is multiple. The steel plates (2.1) are arranged in an array along the length of the second Larsen buckle (2.2). The second Larsen buckle (2.2) is strip-shaped. The bending buckle (2.1.1) and the second Larsen buckle (2.2) are located at the left and right ends of the steel plate (2.1) respectively. The steel plate (2.1) is inserted into the vertical opening (1.1) of the steel pipe pile (1). The bending buckle (2.1.1) is locked in the steel pipe pile (1). The first Larsen buckle (3) and the second Larsen buckle (2.2) are connected to the locking steel pipe piles (1) on both sides of the locking steel pipe pile structure of the steel cofferdam closure joint, thus completing the closure of the cofferdam structure.

4. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 3, characterized in that, The width of the bent buckle (2.1.1) is greater than the width of the vertical opening (1.1), and the width of the bent buckle (2.1.1) is greater than three times the width of the vertical opening (1.1).

5. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 3, characterized in that, The bending angle of the bending buckle (2.1.1) is less than 80°, and the bending buckle (2.1.1) is used to prevent the locking element (2) from detaching from the steel pipe pile (1).

6. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 3, characterized in that, A rectangular opening (2.3) is provided on the steel plate (2.1) at the bottom of the locking member (2). The length direction of the rectangular opening (2.3) is set from the bent buckle (2.1.1) to the second Larsen buckle (2.2). The rectangular opening (2.3) is located on the lower side of the steel plate (2.1).

7. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 6, characterized in that, The limiting bolt (2.4) is inserted into the rectangular opening (2.3), and the limiting bolt (2.4) can slide and lock within the rectangular opening (2.3) along the length direction of the rectangular opening (2.3).

8. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 1, characterized in that, The locking fastener (2) and the first Larsen fastener (3) are arranged symmetrically about the axis of the steel pipe pile (1).

9. A telescopic interlocking steel pipe pile structure for cofferdam closure according to claim 8, characterized in that, The locking fastener (2) and the first Larsen buckle (3) are on the same plane.

10. A working method for a telescopic interlocking steel pipe pile structure used for cofferdam closure, employing the telescopic interlocking steel pipe pile structure as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1): Arrange multiple steel plates (2.1) in an array along the length of the second Larssen buckle (2.2), and weld the multiple steel plates (2.1) to the second Larssen buckle (2.2); Step 2): Weld the other side of each steel plate (2.1) to the bending buckle (2.1.1) to form a locking member (2). Insert the steel plate (2.1) of the locking member (2) into the vertical opening (1.1) of the steel pipe pile (1). Weld the first Larsen buckle (3) on the opposite side of the locking member (2). The steel pipe pile (1), the locking member (2) and the first Larsen buckle (3) together form a telescopic locking steel pipe pile structure. Step 3): Before the steel cofferdam of the lock-joint steel pipe pile structure is closed, measure the top distance between the top of the first Larssen buckle (3) on one side of the steel pipe pile (1) and the top of the locking fastener (2) on the opposite side of the first Larssen buckle (3). Move the locking fastener (2) in the radial direction of the steel pipe pile (1) and then fix the limiting bolt (2.4). After the locking fastener (2) is assembled with the first Larssen buckle (3) on the adjacent steel pipe pile (1), loosen the limiting bolt (2.4), start the driving construction and complete the closure. Step 4): After the driving is completed, clay can be backfilled inside the steel pipe pile (1), and the joint between the steel pipe pile (1) and the steel plate (2.1) can be sealed by welding to prevent water from outside the cofferdam from seeping into the steel pipe pile (1) of the cofferdam.

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