Fabricated cofferdam structure and double-lock-catch cofferdam unit thereof

Abstract

The utility model relates to a fabricated cofferdam structure and a double-lock-catch cofferdam unit thereof. Each double-lock-catch cofferdam unit comprises a cofferdam box body, steel pipe piles, first lock catch connectors and second lock catch connectors, and each first lock catch connector of one double-lock-catch cofferdam unit is correspondingly connected with each second lock catch connector of another adjacent double-lock-catch cofferdam unit in an inserted mode. Every two adjacent double-lock-catch cofferdam units define a water stopping space through cooperation of the first lock catch connectors and the second lock catch connectors. Through cooperation of the two first lock catch connectors and the two second lock catch connectors, the splicing reliability of the two double-lock-catch cofferdam units can be improved, meanwhile, a water stopping space is conveniently formed, and the water stopping effect of the splicing position is improved. And meanwhile, the steel pipe piles are fixedly connected with the inner wall of the cofferdam box body, the advantages of a steel sheet pile cofferdam and a lock catch steel pipe cofferdam are effectively fused, the structural strength is enhanced, the applicability in complex geology and deepwater foundation construction is improved, splicing is convenient, and the water resisting property is good.

Description

Technical Field

[0001] The present application relates to the technical field of cofferdam construction, and in particular to an assembled cofferdam structure and a double-locking cofferdam unit thereof. Background Art

[0002] With the rapid development of bridge construction in my country, underwater pier construction technology is also constantly improving. Steel cofferdams are widely used in underwater pier construction due to their high overall rigidity, good water-stopping performance, and mature construction technology.

[0003] Currently, commonly used steel cofferdams include steel sheet pile cofferdams and locking steel pipe cofferdams. Locking steel pipe cofferdams generally consist of a main steel pipe, a welded C-shaped locking steel pipe on one side, and an I-beam on the other. However, in actual construction, this type of locking steel pipe generally has problems with the locking snaps interlocking tightly, making it very prone to leakage during deep-water construction. Steel sheet pile cofferdams are usually constructed by splicing and installing steel sheet piles. However, in areas with high flow rates, the thin steel sheet piles have poor structural stability and are therefore not suitable for ultra-deep foundation pits or water areas. To ensure the overall structural strength and stability, multiple auxiliary steel plates are usually required for reinforcement. This operation is relatively cumbersome and consumes a lot of steel. Utility Model Content

[0004] Based on this, it is necessary to provide an assembled cofferdam structure and a double-locking cofferdam unit thereof that can ensure structural stability and improve water-stopping effect in order to address the above problems.

[0005] A double-locking cofferdam unit, which includes a cofferdam box, steel pipe piles, a first locking joint and a second locking joint. The cofferdam box includes a first docking wall panel and a second docking wall panel, and the first docking wall panel and the second docking wall panel are respectively used to dock with adjacent double-locking cofferdam units; the steel pipe piles are inserted into the cofferdam box and fixedly connected to the inner wall of the cofferdam box; the number of the first locking joints is two, and the two first locking joints are both arranged on the first docking wall panel, and the two first locking joints are spaced apart along the width direction of the first docking wall panel; the number of the second locking joints is two, and the two second locking joints are both arranged on the second docking wall panel, and the two second locking joints are spaced apart along the width direction of the second docking wall panel.

[0006] In one embodiment, the first docking wall panel includes two first mounting plates and two first splicing plates, the two first mounting plates are spaced apart and located on the same plane, the two first locking joints are respectively arranged on the outer walls of the two first mounting plates, one side edge of each first splicing plate is correspondingly connected to the side edge of one first mounting plate facing the other first mounting plate, and the other side edge is connected to the steel pipe pile, and the outer wall surfaces of the two first splicing plates form a "V"-shaped space.

[0007] In one embodiment, the second docking wall panel includes two second mounting plates and two second splicing plates, the two second mounting plates are spaced apart and located on the same plane, the two second locking joints are respectively arranged on the outer walls of the two second mounting plates, one side edge of each second splicing plate is correspondingly connected to the side edge of one second mounting plate facing the other second mounting plate, and the other side edge is connected to the steel pipe pile, and the outer wall surfaces of the two second splicing plates form a "V"-shaped space.

[0008] In one embodiment, the cofferdam box also includes two panels, the first docking wall panel and the second docking wall panel are arranged opposite to each other at intervals, and the two opposite sides of each panel are respectively connected to the first docking wall panel and the second docking wall panel, and the inner walls of the two panels are both abutted against the steel pipe piles.

[0009] In one embodiment, the cofferdam box further includes a plurality of vertical ribs, and at least two of the vertical ribs are spaced apart on the inner walls of the first docking wall panel, the second docking wall panel, and the two panels.

[0010] In one embodiment, the number of the steel pipe piles is two, and the two steel pipe piles are arranged at intervals in the cofferdam box. The cofferdam box also includes a partition and at least two reinforcing plates. The partition is located between the two steel pipe piles, and the opposite two sides of the partition are respectively connected to the two panels. One side of at least one reinforcing plate is connected to the partition, and the other opposite side is connected to one steel pipe pile. One side of at least another reinforcing plate is connected to the partition, and the other opposite side is connected to another steel pipe pile.

[0011] In one embodiment, each of the steel pipe piles is connected to the partition plate via two reinforcing plates, and the distance between the two reinforcing plates on the steel pipe pile is smaller than the distance between the two reinforcing plates on the partition plate.

[0012] In one embodiment, in two adjacent double-locking cofferdam units in the horizontal direction, the two first locking joints of one double-locking cofferdam unit can be respectively plugged into the two second locking joints of the other double-locking cofferdam unit to form a water-stop space; among the first locking joints and the second locking joints that are plugged into each other, one is a "C"-shaped locking tube, and the other is a "T"-shaped steel bar or an "I"-shaped steel bar.

[0013] A prefabricated cofferdam structure comprises at least two double-locking cofferdam units as described above, each first locking joint of one double-locking cofferdam unit is plugged into each second locking joint of another adjacent double-locking cofferdam unit, and the two adjacent double-locking cofferdam units form a water-stop space through the cooperation of the first locking joint and the second locking joint.

[0014] In one embodiment, the water-stop space is filled with a water-stop, or the water-stop space and the space enclosed by the first locking joint and the second locking joint are filled with a water-stop; wherein the water-stop is a filler formed by a mixture of clay, sawdust and butter; or the water-stop may also include mud mortar and / or concrete.

[0015] The above-mentioned assembled cofferdam structure and its double-locking cofferdam unit, during construction, two double-locking cofferdam units are arranged adjacent to each other, so that the first docking wall plate of one double-locking cofferdam unit is arranged relative to the second docking wall plate of the other double-locking cofferdam unit, each first locking joint of one double-locking cofferdam unit is correspondingly plugged into each second locking joint of the other adjacent double-locking cofferdam unit, and the two adjacent double-locking cofferdam units form a water-stopping space through the cooperation of the first locking joint and the second locking joint. By arranging the cooperation of the two first locking joints and the two second locking joints, not only can the splicing reliability of the two double-locking cofferdam units be improved, but it can also facilitate the formation of a water-stopping space and improve the water-stopping effect of the splicing position. At the same time, the steel pipe piles of the double-locking cofferdam unit are passed through the cofferdam box and fixedly connected to the inner wall of the cofferdam box. The use of steel pipe piles can strengthen the structural strength of the cofferdam box, so that the combined cofferdam can be used in deepwater areas. The above-mentioned double-locking cofferdam unit and prefabricated cofferdam structure effectively combine the advantages of steel sheet pile cofferdam and locking steel pipe cofferdam, enhance structural strength, improve applicability in complex geological and deep-water foundation construction, and are easy to splice and have good water-proof properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of various elements are drawn only as examples in the drawings and are not necessarily drawn to true scale.

[0019] Figure 1 Schematic diagram of the structure of a double-locking cofferdam unit in one embodiment.

[0020] Figure 2 for Figure 1 The shown figure is a top view of the local structure of the double-lock cofferdam unit in the spliced ​​state.

[0021] Figure 3 for Figure 1 A partial top view of the double-locking cofferdam unit is shown.

[0022] Figure 4 It is a partial top view of the double-locking cofferdam unit in the first embodiment.

[0023] Figure 5 It is a partial top view of the double-locking cofferdam unit in the second embodiment.

[0024] Figure 6 It is a partial top view of the double-locking cofferdam unit in the third embodiment.

[0025] Description of reference numerals:

[0026] Double-locking cofferdam unit 10; cofferdam box 100; first docking wall panel 110; first mounting plate 112; first splicing plate 114; second docking wall panel 120; second mounting plate 122; second splicing plate 124; panel 130; vertical rib 140; partition 150; reinforcement plate 160; first locking joint 200; second locking joint 300; steel pipe pile 400; water-stop space 20. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] See Figure 1 and Figure 2 The assembled cofferdam structure in one embodiment of the present application is formed by splicing at least two double-locking cofferdam units 10, which can at least ensure structural stability and improve water-stopping effect.

[0029] Specifically, the double-locking cofferdam unit 10 includes a cofferdam box 100, a first locking joint 200, a second locking joint 300, and a steel pipe pile 400. The cofferdam box 100 includes a first docking wall panel 110 and a second docking wall panel 120, each of which is used to dock with an adjacent double-locking cofferdam unit 10. The steel pipe pile 400 is inserted into the cofferdam box 100 and fixedly connected to the inner wall of the cofferdam box 100. There are two first locking joints 200, both of which are provided on the first docking wall panel 110 and spaced apart along the width of the first docking wall panel 110. There are two second locking joints 300, both of which are provided on the second docking wall panel 120 and spaced apart along the width of the second docking wall panel 120.

[0030] During splicing, each first locking joint 200 of a double-locking cofferdam unit 10 corresponds to each second locking joint 300 of another adjacent double-locking cofferdam unit 10, and the two adjacent double-locking cofferdam units 10 form a water-stop space 20 through the cooperation of the first locking joint 200 and the second locking joint 300.

[0031] During construction, two double-locking cofferdam units 10 are arranged adjacent to each other, so that the first docking wall plate 110 of one double-locking cofferdam unit 10 is arranged opposite to the second docking wall plate 120 of the other double-locking cofferdam unit 10, and each first locking joint 200 of one double-locking cofferdam unit 10 is correspondingly plugged into each second locking joint 300 of the other adjacent double-locking cofferdam unit 10. The two adjacent double-locking cofferdam units 10 form a water-stopping space 20 through the cooperation of the first locking joint 200 and the second locking joint 300. By arranging the cooperation of the two first locking joints 200 and the two second locking joints 300, not only can the splicing reliability of the two double-locking cofferdam units 10 be improved, but it is also convenient to form the water-stopping space 20, thereby improving the water-stopping effect of the splicing position. The steel pipe piles 400 of the double-locking cofferdam unit 10 are installed within the cofferdam box 100 and fixedly connected to the inner wall of the cofferdam box 100. The steel pipe piles 400 enhance the structural strength of the cofferdam box 100, enabling the modular cofferdam to be used in deepwater applications. The double-locking cofferdam unit 10 and assembled cofferdam structure effectively combine the advantages of steel sheet pile cofferdams and locking steel pipe cofferdams, enhancing structural strength and improving applicability in complex geological and deepwater foundation construction. Furthermore, the structure offers easy assembly and excellent water-blocking properties.

[0032] In one embodiment, the waterstop space 20 is filled with a waterstop. By filling the waterstop space 20 with a waterstop, the waterstop effect at the joint of the two double-locking cofferdam units 10 can be further improved, and the possibility of water seepage can be reduced. Specifically, the waterstop is a filler formed by a mixture of clay, sawdust and butter. By filling the mixture of clay, sawdust and butter, the sealing effect at the joint is improved while facilitating filling. In other embodiments, the waterstop can also be mud mortar and / or concrete, etc. The concrete can be ordinary concrete, UHPC high-performance concrete, etc. The assembled cofferdam structure can be changed from a temporary structure to a permanent cofferdam, forming a permanent anti-collision structure for the bridge pier.

[0033] In this embodiment, the space enclosed by the first locking joint 200 and the second locking joint 300 is filled with a water stop. Filling the space enclosed by the first locking joint 200 and the second locking joint 300 with the water stop not only improves the water stop effect, but also improves the connection reliability of the spliced ​​first locking joint 200 and the second locking joint 300.

[0034] See Figure 1 and Figure 3 In one embodiment, the first docking wall panel 110 includes two first mounting plates 112 and two first splicing plates 114. The two first mounting plates 112 are spaced apart and located on the same plane. Two first locking joints 200 are respectively provided on the outer walls of the two first mounting plates 112. One side of each first splicing plate 114 is connected to the side of one first mounting plate 112 facing the other first mounting plate 112, and the other side is connected to the steel pipe pile 400. The outer walls of the two first splicing plates 114 form a "V"-shaped space. The V-shaped structure formed by the two first splicing plates 114 can utilize the principle of triangular stability to increase the cofferdam box 100's ability to resist torsional deformation and reduce the possibility of torsional deformation during splicing and installation.

[0035] In one embodiment, the second docking wall panel 120 includes two second mounting plates 122 and two second splicing plates 124. The two second mounting plates 122 are spaced apart and located on the same plane. Two second locking joints 300 are respectively provided on the outer walls of the two second mounting plates 122. One side of each second splicing plate 124 is connected to the side of one second mounting plate 122 facing the other second mounting plate 122, and the other side is connected to the steel pipe pile 400. The outer walls of the two second splicing plates 124 enclose a "V"-shaped space. The V-shaped structure formed by the two second splicing plates 124 can utilize the principle of triangular stability to increase the cofferdam box 100's ability to resist torsional deformation and reduce the possibility of torsional deformation during splicing and installation.

[0036] like Figure 2 As shown, when two double-locking cofferdam units 10 are spliced ​​together, the outer walls of the two first splicing plates 114 form a "V"-shaped space, which connects with the outer walls of the two second splicing plates 124 to form a "V"-shaped space, forming a waterstop space 20. The two "V"-shaped spaces can increase the size of the waterstop space 20, thereby facilitating a more compact filling of the waterstop material, thus resolving the problem of the traditional waterstop space 20 being narrow and difficult to fill with waterstop fillers.

[0037] See Figure 1 and Figure 3 In one embodiment, the cofferdam box 100 further includes two panels 130. The first docking wall panel 110 and the second docking wall panel 120 are spaced apart and arranged opposite to each other. The two panels 130 are spaced apart and opposite to each other, and the opposite sides of each panel 130 are respectively connected to the first docking wall panel 110 and the second docking wall panel 120. The inner walls of the two panels 130 are in abutment with the steel pipe piles 400. By providing the two panels 130, the first docking wall panel 110 and the second docking wall panel 120 can enclose a space to accommodate the steel pipe piles 400.

[0038] Specifically, the cofferdam box 100 further includes a plurality of vertical ribs 140, with at least two vertical ribs 140 spaced apart on the inner walls of the first docking wall panel 110, the second docking wall panel 120, and the two face panels 130. The vertical ribs 140 enhance the structural strength of the first docking wall panel 110, the second docking wall panel 120, and the two face panels 130, thereby improving the cross-sectional properties of the overall structure and thereby ensuring the compressive stability of the cofferdam box 100.

[0039] In this embodiment, there are two steel pipe piles 400, spaced apart within the cofferdam box 100. The cofferdam box 100 also includes a partition 150 and at least two reinforcing plates 160. The partition 150 is located between the two steel pipe piles 400, with two opposing sides of the partition 150 connected to the two panels 130. At least one reinforcing plate 160 has one side connected to the partition 150 and the other, opposing side connected to one steel pipe pile 400. At least one other reinforcing plate 160 has one side connected to the partition 150 and the other, opposing side connected to another steel pipe pile 400. The provision of the reinforcing plates 160 further improves the reliability of the connection between the steel pipe piles 400 and the cofferdam box 100, ensuring structural strength. Furthermore, the provision of two steel pipe piles 400 allows the double-locking cofferdam unit 10 to have a certain transverse dimension, facilitating assembly and formation of an assembled cofferdam structure.

[0040] In other embodiments, the number of the steel pipe piles 400 can be one, three, or other numbers according to the splicing requirements of the assembled cofferdam structure. To reduce the difficulty of splicing, the number of the steel pipe piles 400 of the double-locking cofferdam unit 10 should not be too many.

[0041] In one embodiment, each of the steel pipe piles 400 is connected to the partition 150 via two reinforcement plates 160, and the spacing between the two reinforcement plates 160 on the steel pipe piles 400 is smaller than the spacing between the two reinforcement plates 160 on the partition 150. By installing the reinforcement plates 160 at different positions on both sides, a nearly triangular space can be formed, thereby utilizing the principle of triangular stability to enhance the torsional deformation resistance of the double-locking cofferdam unit 10.

[0042] See Figure 1 and Figure 3 In this embodiment, in two double-locking cofferdam units 10 adjacent in the horizontal direction, the two first locking joints 200 of one double-locking cofferdam unit 10 can be respectively plugged into the two second locking joints 300 of the other double-locking cofferdam unit 10 to form a water-stop space 20; among the first locking joints 200 and the second locking joints 300 that are plugged into each other, one is a "C"-shaped locking tube, and the other is a "T"-shaped steel bar or an "I"-shaped steel bar.

[0043] Specifically, the first locking joint 200 is a C-shaped locking tube, and the second locking joint 300 is a T-shaped steel bar or an I-shaped steel bar. In this embodiment, the C-shaped locking tube is further filled with a waterstop. The double locking cofferdam unit 10 of the double CT locking joint of the present application not only reduces the difficulty of splicing, but also improves the waterstop effect.

[0044] like Figure 4 As shown, in another embodiment, the first locking joint 200 and the second locking joint 300 of a double-locking cofferdam unit 10 are both "C"-shaped locking tubes, then the first locking joint 200 and the second locking joint 300 of the two adjacent double-locking cofferdam units 10 spliced ​​with the double-locking cofferdam unit 10 can both be "T"-shaped steel bars or "I"-shaped steel bars.

[0045] like Figure 5 As shown, in one embodiment, when the double-lock cofferdam unit 10 is used at the corner of the assembled cofferdam structure, the second docking wall panel 120 can be arranged at a right angle to the first docking wall panel 110. Figure 6 As shown, in another embodiment, when the double-locking cofferdam unit 10 is used at the corner of the assembled cofferdam structure, the cofferdam box 100 can be set into an "L"-shaped structure, and the first locking joint 200 and the second locking joint 300 are respectively set at the two ends of the "L"-shaped structure.

[0046] See Figure 1 and Figure 2The above-mentioned double-locking cofferdam unit 10 and prefabricated cofferdam structure, formed by splicing multiple double-locking cofferdam units 10, has high structural rigidity and is suitable for deep foundation pits or deep water areas. The cofferdam box 100 + steel pipe pile 400 welding connection structure is used to reduce the difficulty of production and realize factory production and assembly installation. The double CT locking joint reduces the insertion accuracy requirements. The water-stop space 20 enclosed by the double CT locking joint is filled with water-stopping materials, which effectively improves the water-stopping effect and solves the problem of traditional locking water-stopping.

[0047] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the directions or positional relationships indicated by these terms are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description.

[0048] The description does not indicate or imply that the device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0049] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0050] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A double-lock cofferdam unit, characterized in that: The double-lock cofferdam unit comprises: A cofferdam box body, comprising a first docking wall panel and a second docking wall panel, wherein the first docking wall panel and the second docking wall panel are respectively used to dock with adjacent double-locking cofferdam units; Steel pipe piles, which are inserted into the cofferdam box and fixedly connected to the inner wall of the cofferdam box; a first locking joint, wherein the number of the first locking joints is two, the two first locking joints are both provided on the first docking wall panel, and the two first locking joints are spaced apart along the width direction of the first docking wall panel; and The second locking joints are two in number, both of which are arranged on the second docking wall panel, and the two second locking joints are arranged at intervals along the width direction of the second docking wall panel.

2. The double-lock cofferdam unit according to claim 1, characterized in that: The first docking wall panel includes two first mounting plates and two first splicing plates. The two first mounting plates are arranged at intervals and located on the same plane. The two first locking joints are respectively arranged on the outer walls of the two first mounting plates. One side edge of each first splicing plate is correspondingly connected to the side edge of one first mounting plate facing the other first mounting plate, and the other side edge is connected to the steel pipe pile. The outer wall surfaces of the two first splicing plates form a "V"-shaped space.

3. The double-lock cofferdam unit according to claim 1, characterized in that: The second docking wall panel includes two second mounting plates and two second splicing plates. The two second mounting plates are arranged at intervals and located on the same plane. The two second locking joints are respectively arranged on the outer walls of the two second mounting plates. One side edge of each second splicing plate is correspondingly connected to the side edge of one second mounting plate facing the other second mounting plate, and the other side edge is connected to the steel pipe pile. The outer wall surfaces of the two second splicing plates form a "V"-shaped space.

4. The double-lock cofferdam unit according to claim 2, characterized in that: The cofferdam box also includes two panels, the first docking wall panel and the second docking wall panel are arranged opposite to each other at intervals, and the two opposite sides of each panel are respectively connected to the first docking wall panel and the second docking wall panel, and the inner walls of the two panels are both abutted against the steel pipe piles.

5. The double-lock cofferdam unit according to claim 4, characterized in that: The cofferdam box further includes a plurality of vertical ribs, and at least two of the vertical ribs are spaced apart on the inner walls of the first docking wall plate, the second docking wall plate, and the two panels.

6. The double-lock cofferdam unit according to claim 4, characterized in that: There are two steel pipe piles, and the two steel pipe piles are arranged at intervals in the cofferdam box. The cofferdam box also includes a partition and at least two reinforcing plates. The partition is located between the two steel pipe piles, and the opposite two sides of the partition are respectively connected to the two panels. One side of at least one reinforcing plate is connected to the partition, and the other opposite side is connected to one steel pipe pile. One side of at least another reinforcing plate is connected to the partition, and the other opposite side is connected to another steel pipe pile.

7. The double-lock cofferdam unit according to claim 6, characterized in that: Each of the steel pipe piles is connected to the partition plate via two reinforcing plates, and the distance between the two reinforcing plates on the steel pipe pile is smaller than the distance between the two reinforcing plates on the partition plate.

8. The double-locking cofferdam unit according to any one of claims 1 to 7, characterized in that: In the two double-locking cofferdam units adjacent in the horizontal direction, the two first locking joints of one double-locking cofferdam unit can be respectively plugged into the two second locking joints of the other double-locking cofferdam unit to form a water-stop space; among the first locking joints and the second locking joints that are plugged into each other, one is a "C"-shaped locking tube, and the other is a "T"-shaped steel bar or an "I"-shaped steel bar.

9. An assembled cofferdam structure, characterized in that: The assembled cofferdam structure includes at least two double-locking cofferdam units as described in claims 1-8, each first locking joint of one double-locking cofferdam unit corresponds to and is plugged into each second locking joint of another adjacent double-locking cofferdam unit, and the two adjacent double-locking cofferdam units form a water-stop space through the cooperation of the first locking joint and the second locking joint.

10. The assembled cofferdam structure according to claim 9, characterized in that: The water-stop space is filled with a water-stop object, or the water-stop space and the space enclosed by the first locking joint and the second locking joint are filled with a water-stop object; wherein the water-stop object includes mud mortar or concrete.

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