A water-stopping and leak-proofing structure and water-stopping and leak-proofing method for locking steel pipe pile cofferdam

Abstract

The present invention discloses a water-stopping and leak-proofing structure and a water-stopping and leak-proofing method for a locking steel pipe pile cofferdam, comprising a first semi-arc plate, a second semi-arc plate and a third semi-arc plate, the inner concave surface of the second semi-arc plate can fit with the outer wall of the first locking steel pipe pile constituting the cofferdam, the inner concave surface of the third semi-arc plate can fit with the outer wall of the second locking steel pipe pile constituting the cofferdam, the first locking steel pipe pile and the second locking steel pipe pile are adjacent; one side of the outer convex surface of the first semi-arc plate is sealedly connected to one side of the outer convex surface of the second semi-arc plate, the other side of the outer convex surface of the first semi-arc plate is sealedly connected to one side of the outer convex surface of the third semi-arc plate, the top of the first semi-arc plate is flush with the tops of the second semi-arc plate and the third semi-arc plate, the bottom of the first semi-arc plate is flush with the bottoms of the second semi-arc plate and the third semi-arc plate, a cavity is formed between the outer convex surfaces of the first semi-arc plate, the second semi-arc plate and the third semi-arc plate, and the leak-proofing effect of the present invention is good.

Description

Technical Field

[0001] The invention belongs to the technical field of locking steel pipe pile cofferdam construction, and particularly relates to a water stopping and leak plugging structure and a water stopping and leak plugging method for locking steel pipe pile cofferdam. Background Art

[0002] As a common form of underwater foundation pit support, the locking steel pipe pile cofferdam has a deep driving depth. Whether the locking steel pipe piles at the bottom of the foundation pit are leaking can only be fully discovered after excavation. The C9 type locking steel pipe pile cofferdam is usually plugged while the foundation pit is excavated.

[0003] At present, for small amounts of water leakage, C9 type locking steel pipe piles generally adopt methods such as filling butter, cotton wool, wooden wedges, etc. in the locking buckle to achieve good treatment results; however, if the leakage is large and accompanied by sand gushing, a large amount of mud and high-pressure water flow makes it impossible to start the plugging operation. At this time, the general filling plugging method is no longer applicable and cannot solve the leakage problem well. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a water-stopping and leak-proofing structure and a water-stopping and leak-proofing method for a locking steel pipe pile cofferdam, which is suitable for leak-proofing operations when there is a large amount of water leakage in the locking steel pipe pile cofferdam accompanied by sand gushing, and has a good leak-proofing effect.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] A water-stopping and leak-proofing structure for a locking steel pipe pile cofferdam, comprising a first semi-arc plate, a second semi-arc plate and a third semi-arc plate, wherein the inner concave surface of the second semi-arc plate can fit with the outer wall of the first locking steel pipe pile constituting the cofferdam, and the inner concave surface of the third semi-arc plate can fit with the outer wall of the second locking steel pipe pile constituting the cofferdam, and the first locking steel pipe pile and the second locking steel pipe pile are adjacent; one side of the outer convex surface of the first semi-arc plate is sealedly connected to one side of the outer convex surface of the second semi-arc plate, and the other side of the outer convex surface of the first semi-arc plate is sealedly connected to one side of the outer convex surface of the third semi-arc plate, the top of the first semi-arc plate is flush with the tops of the second semi-arc plate and the third semi-arc plate, and the bottom of the first semi-arc plate is flush with the bottoms of the second semi-arc plate and the third semi-arc plate, and a cavity for filling a water-stopping and leak-proofing medium is formed between the outer convex surfaces of the first semi-arc plate, the second semi-arc plate and the third semi-arc plate.

[0007] Furthermore, it also includes a first limiting guide member and a second limiting guide member, the first limiting guide member is used to limit and guide the connecting end of the first semi-arc plate and the second semi-arc plate after being connected to the outer wall of the first locking steel pipe pile, and the second limiting guide member is used to limit and guide the connecting end of the first semi-arc plate and the third semi-arc plate after being connected to the outer wall of the second locking steel pipe pile.

[0008] Further, the first limiting guide and the second limiting guide both include a first unit plate, a second unit plate and a third unit plate, one side end of the second unit plate is vertically connected to one side end of the first unit plate, the other side end of the second unit plate is vertically connected to one side end of the third unit plate, the extension direction of the other side end of the first unit plate is opposite to the extension direction of the other side end of the third unit plate, the first unit plate of the first limiting guide is used to connect to the outer wall of the first locking steel pipe pile, and the first unit plate of the second limiting guide is used to connect to the outer wall of the second locking steel pipe pile.

[0009] Furthermore, the first unit plate is an arc-shaped plate that matches the outer walls of the first locking steel pipe pile and the second locking steel pipe pile.

[0010] Further, the top end of the second unit board is flush with the top ends of the first unit board and the third unit board, and the bottom end of the second unit board is flush with the bottom ends of the first unit board and the third unit board.

[0011] Furthermore, a blade foot following the shape of the first semi-arc-shaped plate is provided at the bottom of the first semi-arc-shaped plate.

[0012] A water-stopping and leak-proofing method for a locking steel pipe pile cofferdam, using the water-stopping and leak-proofing structure, comprises:

[0013] When leakage occurs between the first locking steel pipe pile and the second locking steel pipe pile constituting the cofferdam, the water-stopping and leak-proofing structure is driven downward from between the first locking steel pipe pile and the second locking steel pipe pile on the outside of the cofferdam, and during the driving downward, the inner concave surface of the second semi-arc plate of the water-stopping and leak-proofing structure is fitted with the outer wall of the first locking steel pipe pile, and the inner concave surface of the third semi-arc plate of the water-stopping and leak-proofing structure is fitted with the outer wall of the second locking steel pipe pile, until the bottom of the water-stopping and leak-proofing structure is lower than the set distance of the leakage position, the downward driving is stopped, and the water-stopping and leak-proofing medium is filled into the cavity.

[0014] Furthermore, before the downward driving, the first limiting guide is fixed to the outer wall of the first locking steel pipe pile, and the second limiting guide is fixed to the outer wall of the second locking steel pipe pile on the outside of the cofferdam. During the downward driving, the connecting end of the first semi-arc plate and the second semi-arc plate is moved downward along the first limiting guide, and the connecting end of the first semi-arc plate and the third semi-arc plate is moved downward along the second limiting guide.

[0015] Furthermore, when the first position limiting guide member is fixed on the outer wall of the first locking steel pipe pile, the top end of the first position limiting guide member is flush with the top end of the first locking steel pipe pile; when the second position limiting guide member is fixed on the outer wall of the second locking steel pipe pile, the top end of the second position limiting guide member is flush with the top end of the second locking steel pipe pile.

[0016] Furthermore, before filling the water-stopping and leak-proofing medium into the cavity, the mud and sand impurities that have infiltrated into the cavity are cleaned.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The present invention provides a water-stopping and leak-proofing structure for a locking steel pipe pile cofferdam, which adopts a second semi-arc plate fitted with the outer wall of the first locking steel pipe pile constituting the cofferdam and a third semi-arc plate fitted with the outer wall of the second locking steel pipe pile constituting the cofferdam, and cooperates with the sealing connection with the first semi-arc plate, so that a cavity for filling a water-stopping and leak-proofing medium is formed between the outer convex surfaces of the first semi-arc plate, the second semi-arc plate and the third semi-arc plate. When leak-proofing is required and the leakage is large, the water-stopping and leak-proofing structure of the present invention is used to insert the water-stopping and leak-proofing structure into two adjacent ones that need to be plugged. Between the locking steel pipe piles, because the inner concave surface of the second semi-arc plate fits with the outer wall of the first locking steel pipe pile constituting the cofferdam, the inner concave surface of the third semi-arc plate fits with the outer wall of the second locking steel pipe pile constituting the cofferdam, and together with the first semi-arc plate forms a cavity, a large amount of water leakage and sand gushing can be turned into a small amount of seepage to prevent sand gushing, and then the water-stopping and leak-proof medium is filled in the cavity, and after the water-stopping and leak-proof medium in the cavity solidifies, the water seepage is completely sealed. It can be seen that the present invention is suitable for plugging operations when there is a large amount of water leakage and sand gushing in the locking steel pipe pile cofferdam, and the plugging effect is good.

[0019] Furthermore, a first limit guide and a second limit guide are provided, and the first limit guide and the second limit guide are fixed on the corresponding locking steel pipe piles, and jointly guide, limit and fix the water-stopping and leak-proofing structure formed by the first semi-arc plate, the second semi-arc plate and the third semi-arc plate, so as to facilitate the downward installation of the water-stopping and leak-proofing structure and facilitate operation. At the same time, the water-stopping and leak-proofing structure is positioned to prevent the water-stopping and leak-proofing structure from shifting after being impacted, thereby improving reliability when the water-stopping and leak-proofing medium is subsequently injected into the cavity.

[0020] The present invention provides a method for water stopping and plugging leakage of a locking steel pipe pile cofferdam. When a large amount of leakage occurs between a first locking steel pipe pile and a second locking steel pipe pile constituting the cofferdam, a water stopping and plugging structure is driven downward from between the first locking steel pipe pile and the second locking steel pipe pile on the outside of the cofferdam, so that the inner concave surface of the second semi-arc plate of the water stopping and plugging structure fits with the outer wall of the first locking steel pipe pile, and the inner concave surface of the third semi-arc plate of the water stopping and plugging structure fits with the outer wall of the second locking steel pipe pile. The downward driving is stopped until the bottom of the water stopping and plugging structure is lower than a set distance from the leakage position, and a water stopping and plugging medium is filled into the cavity. When the water stopping and plugging medium is solidified, the water stopping and plugging work at the leakage position of the cofferdam is completed. This method can turn a large amount of water leakage and sand gushing into a small amount of water seepage, prevent sand gushing, greatly improve the plugging effect of the plugging work when a large amount of water seepage and sand gushing occurs, and is easy to operate.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the coordination of a water-stopping and leak-proofing structure for locking steel pipe pile cofferdam of the present invention after the water-stopping and leak-proofing is completed;

[0024] Figure 2 It is a three-dimensional schematic diagram of a water-stopping and leak-proofing structure for locking a steel pipe pile cofferdam according to the present invention in one embodiment;

[0025] Figure 3 It is a top view schematic diagram of a water-stopping and leak-proofing structure for locking steel pipe pile cofferdams of the present invention;

[0026] Figure 4It is a three-dimensional schematic diagram of a water-stopping and leak-proofing structure for locking steel pipe pile cofferdams of the present invention;

[0027] Figure 5 The present invention is a schematic front view of a water-stopping and leak-proofing structure for locking a steel pipe pile cofferdam.

[0028] In the figure: 1-first semi-arc plate; 2-second semi-arc plate; 3-third semi-arc plate; 4-cavity; 5-first locking steel pipe pile; 6-second locking steel pipe pile; 7-first limiting guide; 8-second limiting guide; 9-blade foot; 10-C9 lock; a-first unit plate; b-second unit plate; c-third unit plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] As a specific embodiment of the present invention, Figure 4 and Figure 5 As shown, the present invention provides a water-stopping and leak-proofing structure for a locking steel pipe pile cofferdam, comprising a first semi-arc plate 1, a second semi-arc plate 2 and a third semi-arc plate 3, the inner concave surface of the second semi-arc plate 2 can fit with the outer wall of the first locking steel pipe pile 5 constituting the cofferdam, the inner concave surface of the third semi-arc plate 3 can fit with the outer wall of the second locking steel pipe pile 6 constituting the cofferdam, and the first locking steel pipe pile 5 and the second locking steel pipe pile 6 are adjacent. One side of the outer convex surface of the first semi-arc plate 1 is sealedly connected to one side of the outer convex surface of the second semi-arc plate 2, the other side of the outer convex surface of the first semi-arc plate 1 is sealedly connected to one side of the outer convex surface of the third semi-arc plate 3, the top of the first semi-arc plate 1 is flush with the tops of the second semi-arc plate 2 and the third semi-arc plate 3, and the bottom of the first semi-arc plate 1 is flush with the bottoms of the second semi-arc plate 2 and the third semi-arc plate 3. In one embodiment, one side of the outer convex surface of the first semi-arc plate 1 is fixedly connected to one side of the outer convex surface of the second semi-arc plate 2 by welding, and the other side of the outer convex surface of the first semi-arc plate 1 is fixedly connected to one side of the outer convex surface of the third semi-arc plate 3 by welding. Figure 4 As shown, after the first semi-arc plate 1 is connected to the second semi-arc plate 2 and the third semi-arc plate 3, a cavity 4 for filling with a water-stopping and leak-proofing medium is formed between the outer convex surfaces of the first semi-arc plate 1, the second semi-arc plate 2 and the third semi-arc plate 3.

[0031] Specifically, when the water-stopping and leak-proofing structure provided in this embodiment is used to stop water and leak of the locking steel pipe pile cofferdam, when leakage occurs between the first locking steel pipe pile 5 and the second locking steel pipe pile 6 constituting the cofferdam, the water-stopping and leak-proofing structure provided in this embodiment is used to stop water and leak of the locking steel pipe pile cofferdam. Figure 1 As shown, on the outside of the cofferdam, the water-stopping and leak-proofing structure is driven downwards from between the first locking steel pipe pile 5 and the second locking steel pipe pile 6. When driving downwards, the inner concave surface of the second semi-arc plate 2 of the water-stopping and leak-proofing structure is fitted with the outer wall of the first locking steel pipe pile 5, and the inner concave surface of the third semi-arc plate 3 of the water-stopping and leak-proofing structure is fitted with the outer wall of the second locking steel pipe pile 6. The downward driving is stopped until the bottom of the water-stopping and leak-proofing structure is lower than the set distance of the leakage position, and the water-stopping and leak-proofing medium is filled into the cavity 4. When the water-stopping and leak-proofing medium solidifies, the water-stopping and leak-proofing work at the leakage position of the cofferdam is completed. Preferably, before filling the water-stopping and leak-proofing medium into the cavity 4, the mud and sand impurities that have infiltrated into the cavity 4 are cleaned first to ensure that the water-stopping and leak-proofing medium can better exert its performance in the cavity 4. Preferably, the water-stopping and leak-proofing medium adopts cement slurry.

[0032] On the basis of the above-mentioned embodiment, as a more preferred embodiment, Figure 2 and Figure 3 As shown, the water-stopping and leak-proofing structure also includes a first limiting guide member 7 and a second limiting guide member 8, wherein the first limiting guide member 7 is used to limit and guide the connecting end of the first semi-arc plate 1 and the second semi-arc plate 2 after being connected to the outer wall of the first locking steel pipe pile 5, and the second limiting guide member 8 is used to limit and guide the connecting end of the first semi-arc plate 1 and the third semi-arc plate 3 after being connected to the outer wall of the second locking steel pipe pile 6.

[0033] Specifically, combined with Figure 1As shown, before driving downward, on the outside of the cofferdam, the first limiting guide 7 is fixed on the outer wall of the first locking steel pipe pile 5, and the second limiting guide 8 is fixed on the outer wall of the second locking steel pipe pile 6. Preferably, the first limiting guide 7 is fixed on the outer wall of the first locking steel pipe pile 5 by welding, and the second limiting guide 8 is fixed on the outer wall of the second locking steel pipe pile 6 by welding. In order to facilitate the driving operation, when the first limiting guide 7 is fixed on the outer wall of the first locking steel pipe pile 5, the top of the first limiting guide 7 is flush with the top of the first locking steel pipe pile 5; similarly, when the second limiting guide 8 is fixed on the outer wall of the second locking steel pipe pile 6, the top of the second limiting guide 8 is flush with the top of the second locking steel pipe pile 6. When driving downward, the connection end of the first semi-arc plate 1 and the second semi-arc plate 2 is moved downward along the first limiting guide 7, and the connection end of the first semi-arc plate 1 and the third semi-arc plate 3 is moved downward along the second limiting guide 8. The first limiting guide member 7 realizes the guiding and limiting effects on the connecting end of the first semi-arc plate 1 and the second semi-arc plate 2, and the second limiting guide member 8 realizes the guiding and limiting effects on the connecting end of the semi-arc plate 1 and the third semi-arc plate 3. The first limiting guide member 7 and the second limiting guide member 8 jointly guide, limit and fix the water-stopping and leak-plugging structure formed by the first semi-arc plate 1, the second semi-arc plate 2 and the third semi-arc plate 3, which is convenient for downward installation of the water-stopping and leak-plugging structure and easy operation.

[0034] As a more preferred embodiment, Figure 2 and Figure 3 As shown, the first limiting guide member 7 and the second limiting guide member 8 provided by the present invention both include a first unit plate a, a second unit plate b and a third unit plate c. Specifically, one side end of the second unit plate b is vertically connected to one side end of the first unit plate a, and the other side end of the second unit plate b is vertically connected to one side end of the third unit plate c. The extension direction of the other side end of the first unit plate a is opposite to the extension direction of the other side end of the third unit plate c. Preferably, the top end of the second unit plate b is flush with the top ends of the first unit plate a and the third unit plate c, and the bottom end of the second unit plate b is flush with the bottom ends of the first unit plate a and the third unit plate c; one side end of the second unit plate b is fixedly connected to one side end of the first unit plate a by welding, and the other side end of the second unit plate b is fixedly connected to one side end of the third unit plate c by welding. The first unit plate a of the first limiting guide 7 is used to connect with the outer wall of the first locking steel pipe pile 5, and the third unit plate c of the first limiting guide 7 is used to guide and limit the connecting end of the first semi-arc plate 1 and the second semi-arc plate 2; the first unit plate a of the second limiting guide 8 is used to connect with the outer wall of the second locking steel pipe pile 6, and the third unit plate c of the second limiting guide 8 is used to guide and limit the connecting end of the first semi-arc plate 1 and the third semi-arc plate 3.

[0035] On the basis of the above-mentioned embodiment, preferably, the first unit plate a is an arc-shaped plate that matches the outer walls of the first locking steel pipe pile 5 and the second locking steel pipe pile 6, so that the first unit plate a can better fit with the outer walls of the locking steel pipe piles, making the connection structure more reliable and firm.

[0036] On the basis of the above-mentioned embodiment, as a more preferred embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a blade foot 9 following the shape of the first semi-arc plate 1 is provided at the bottom of the first semi-arc plate 1, that is, the curvature of the blade foot 9 is the same as that of the first semi-arc plate 1. By providing the blade foot 9, during the driving process of the first semi-arc plate 1, the second semi-arc plate 2 and the third semi-arc plate 3 can be offset toward the first locking steel pipe pile 5 and the second locking steel pipe pile 6, that is, the blade foot 9 makes the second semi-arc plate 2 and the first locking steel pipe pile 5 fit more closely, and at the same time makes the third semi-arc plate 3 and the second locking steel pipe pile 6 fit more closely.

[0037] An embodiment is described in detail below in conjunction with the C9 locking steel pipe pile cofferdam to facilitate a better understanding of the present invention.

[0038] like Figure 1 As shown, the first locking steel pipe pile 5 and the second locking steel pipe pile 6 of the C9 locking steel pipe pile cofferdam are connected by a C9 locking buckle 10. The water stopping and leak plugging method of the C9 locking steel pipe pile cofferdam is as follows:

[0039] One side of the outer convex surface of the first semi-arc plate 1 is welded to one side of the outer convex surface of the second semi-arc plate 2, and the other side of the outer convex surface of the first semi-arc plate 1 is welded to one side of the outer convex surface of the third semi-arc plate 3. The second semi-arc plate 2 and the third semi-arc plate 3 are symmetrically arranged relative to the center line of the first semi-arc plate 1. A blade foot 9 is provided at the bottom of the first semi-arc plate 1. A cavity 4 for filling a water-stopping and leak-proofing medium is formed between the outer convex surfaces of the first semi-arc plate 1, the second semi-arc plate 2 and the third semi-arc plate 3.

[0040] According to the overall size of the first locking steel pipe pile 5 and the second locking steel pipe pile 6 of the C9 locking steel pipe pile cofferdam, the position marks of the first limiting guide 7 and the second limiting guide 8 are made on the back sides of the first locking steel pipe pile 5 and the second locking steel pipe pile 6 respectively;

[0041] The first unit plate a of the first limiting guide 7 and the second limiting guide 8 are welded to the back side of the first locking steel pipe pile 5 and the second locking steel pipe pile 6 according to the measurement mark position, and the weld is a full penetration weld. The third unit plate c of the first limiting guide 7 guides and limits the connection end of the first semi-arc plate 1 and the second semi-arc plate 2, and the third unit plate c of the second limiting guide 8 guides and limits the connection end of the first semi-arc plate 1 and the third semi-arc plate 3;

[0042] Insert the lower end of the connection end between the first semi-arc plate 1 and the second semi-arc plate 2 and the lower end of the connection end between the first semi-arc plate 1 and the third semi-arc plate 3 into the first limiting guide 7 and the second limiting guide 8;

[0043] Use a pile driver to drive the water-stopping and leak-proofing structure composed of the first semi-arc plate 1, the second semi-arc plate 2 and the third semi-arc plate 3 to the designed depth. When the bottom of the water-stopping and leak-proofing structure is 1m lower than the leaking and sand gushing part, check whether the second semi-arc plate 2 and the third semi-arc plate 3 are in close contact with the outer walls of the first locking steel pipe pile 5 and the second locking steel pipe pile 6. The driving depth can be appropriately increased according to whether the water leakage in the cofferdam is reduced.

[0044] Use high-pressure water flow to clean the silt in the cavity 4 to the designed depth, use a measuring rope to measure the depth to meet the requirements, use a shovel to clean the silt around the closed cavity 4, use a hard water pipe to flush and lower it, and use a shovel to check the silt cleaning situation around the cavity 4 to ensure that the silt is cleaned up;

[0045] Insert a nylon pipe with a diameter of 10 cm into the cavity 4, and let the bottom of the pipe go deep into the designed depth. Lower the grouting pipe into the nylon pipe to the designed depth, and use a grouting machine to inject grout into the pipe to fill the cavity 4.

[0046] After the strength of the cement slurry in the cavity 4 reaches the design requirement, the leak is stopped, which can ensure leak-stopping and water-proofing.

[0047] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A water-stopping and leak-proofing structure for locking steel pipe pile cofferdam, characterized in that: The invention comprises a first semi-arc plate (1), a second semi-arc plate (2) and a third semi-arc plate (3), wherein the inner concave surface of the second semi-arc plate (2) can be fitted with the outer wall of a first locking steel pipe pile (5) constituting a cofferdam, and the inner concave surface of the third semi-arc plate (3) can be fitted with the outer wall of a second locking steel pipe pile (6) constituting a cofferdam, and the first locking steel pipe pile (5) and the second locking steel pipe pile (6) are adjacent to each other; one side of the outer convex surface of the first semi-arc plate (1) is sealed to one side of the outer convex surface of the second semi-arc plate (2), and the first semi-arc plate (2) is sealed to one side of the outer convex surface of the second semi-arc plate (2). The other side of the outer convex surface of the first semi-arc plate (1) is sealedly connected to one side of the outer convex surface of the third semi-arc plate (3); the top of the first semi-arc plate (1) is flush with the tops of the second semi-arc plate (2) and the third semi-arc plate (3); the bottom of the first semi-arc plate (1) is flush with the bottoms of the second semi-arc plate (2) and the third semi-arc plate (3); and the outer convex surfaces of the first semi-arc plate (1), the second semi-arc plate (2) and the third semi-arc plate (3) jointly form a cavity (4) for filling a water-stopping and leak-proofing medium; It also includes a first limiting guide member (7) and a second limiting guide member (8), wherein the first limiting guide member (7) is used to limit and guide the connection end of the first semi-arc plate (1) and the second semi-arc plate (2) after being connected to the outer wall of the first locking steel pipe pile (5), and the second limiting guide member (8) is used to limit and guide the connection end of the first semi-arc plate (1) and the third semi-arc plate (3) after being connected to the outer wall of the second locking steel pipe pile (6); The first limiting guide (7) and the second limiting guide (8) both comprise a first unit plate (a), a second unit plate (b) and a third unit plate (c); one side end of the second unit plate (b) is vertically connected to one side end of the first unit plate (a); the other side end of the second unit plate (b) is vertically connected to one side end of the third unit plate (c); the extension direction of the other side end of the first unit plate (a) is opposite to the extension direction of the other side end of the third unit plate (c); the first unit plate (a) of the first limiting guide (7) is used to be connected to the outer wall of the first locking steel pipe pile (5); and the first unit plate (a) of the second limiting guide (8) is used to be connected to the outer wall of the second locking steel pipe pile (6).

2. A water-stopping and leak-proofing structure for locking steel pipe pile cofferdam according to claim 1, characterized in that: The first unit plate (a) is an arc-shaped plate that matches the outer walls of the first locking steel pipe pile (5) and the second locking steel pipe pile (6).

3. The water-stopping and leak-proofing structure for locking steel pipe pile cofferdam according to claim 1 is characterized in that: The top end of the second unit plate (b) is flush with the top ends of the first unit plate (a) and the third unit plate (c), and the bottom end of the second unit plate (b) is flush with the bottom ends of the first unit plate (a) and the third unit plate (c).

4. The water-stopping and leak-proofing structure for locking steel pipe pile cofferdam according to claim 1 is characterized in that: The bottom of the first semi-arc plate (1) is provided with a blade foot (9) conforming to the shape of the first semi-arc plate (1).

5. A method for stopping water leakage in a locking steel pipe pile cofferdam, characterized in that: The water-stopping and leak-proofing structure according to any one of claims 1 to 4 comprises: When leakage occurs between the first locking steel pipe pile (5) and the second locking steel pipe pile (6) constituting the cofferdam, the water-stopping and leak-proofing structure is driven downward from between the first locking steel pipe pile (5) and the second locking steel pipe pile (6) on the outside of the cofferdam. During the driving downward, the inner concave surface of the second semi-arc plate (2) of the water-stopping and leak-proofing structure is made to fit with the outer wall of the first locking steel pipe pile (5), and the inner concave surface of the third semi-arc plate (3) of the water-stopping and leak-proofing structure is made to fit with the outer wall of the second locking steel pipe pile (6). The driving downward is stopped until the bottom of the water-stopping and leak-proofing structure is lower than the set distance of the leakage position, and the water-stopping and leak-proofing medium is filled into the cavity (4).

6. A method for stopping water and plugging leaks of a locking steel pipe pile cofferdam according to claim 5, characterized in that: Before the downward driving, the first limiting guide (7) is fixed to the outer wall of the first locking steel pipe pile (5) and the second limiting guide (8) is fixed to the outer wall of the second locking steel pipe pile (6) on the outer side of the cofferdam. During the downward driving, the connecting end of the first semi-arc plate (1) and the second semi-arc plate (2) is moved downward along the first limiting guide (7), and the connecting end of the first semi-arc plate (1) and the third semi-arc plate (3) is moved downward along the second limiting guide (8).

7. A method for stopping water and plugging leaks of a locking steel pipe pile cofferdam according to claim 6, characterized in that: When the first position-limiting guide member (7) is fixed on the outer wall of the first locking steel pipe pile (5), the top end of the first position-limiting guide member (7) is flush with the top end of the first locking steel pipe pile (5); when the second position-limiting guide member (8) is fixed on the outer wall of the second locking steel pipe pile (6), the top end of the second position-limiting guide member (8) is flush with the top end of the second locking steel pipe pile (6).

8. The method for stopping water leakage of a locking steel pipe pile cofferdam according to claim 5, characterized in that: Before the water-stopping and leak-blocking medium is filled into the cavity (4), mud and sand impurities that have infiltrated into the cavity (4) are cleaned.

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