Assembled cofferdam and construction method thereof

Abstract

The present application relates to an assembled cofferdam and a construction method thereof. In a plurality of groups of preset cofferdam units, each group of cofferdam units is plugged into a plug-in module through a matching piece to form a section of the cofferdam module. After hoisting a section of the cofferdam module to a designated location and lowering it to a designated elevation, the next section of the cofferdam module is hoisted. The next section of the cofferdam module is plugged into the lowered cofferdam module through a first locking joint and a second locking joint, and then lowered to a designated elevation until all the cofferdam modules are surrounded to form an assembled cofferdam. During splicing, no welding is required. The size and weight of each cofferdam module are small, and the load-bearing requirements for the hoisting equipment and the construction platform are low. During dismantling, it is only necessary to lift the cofferdam module and disassemble the various cofferdam units of the cofferdam module through the plug-in module and matching pieces. No cutting is required, and no underwater operation is required. The structure of the dismantled cofferdam unit is complete, which effectively improves the construction efficiency and reduces the construction cost.

Description

Technical Field

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

[0002] At present, in the field of underwater bridge foundation construction, steel sheet pile cofferdams and locking steel pipe cofferdams are two commonly used types of steel cofferdams. In the traditional cofferdam installation and construction, the main method is to assemble and lower the cofferdam as a whole. However, the overall assembly and lowering construction has problems such as high difficulty in operation and high requirements for equipment. In order to reduce the difficulty of construction, a construction method of on-site welding, assembly and lowering of segments has emerged. First, an operating platform is built in the river channel, and then the overall assembly of the steel cofferdam is carried out on the operating platform. After completing a full circle of assembly and lowering it to the predetermined position, the subsequent segments are assembled on the lowered steel cofferdam and welded together.

[0003] Although the method of welding and assembling in sections on site simplifies the construction process to a certain extent, the on-site welding and assembly has high requirements for weld quality and welding technology, and the construction operation process is complicated and difficult. In addition, since the steel cofferdam is an integral structure, underwater cutting is required during dismantling. The dismantling process is time-consuming and laborious, which is not only prone to safety accidents, but also not conducive to the secondary use of the steel cofferdam, increasing construction costs. Summary of the invention

[0004] Based on this, it is necessary to provide a prefabricated cofferdam and its construction method that can reduce the difficulty and complexity of construction and facilitate secondary utilization in order to address the above problems.

[0005] A construction method for an assembled cofferdam, the assembled cofferdam comprising at least two cofferdam units, the cofferdam units comprising a cofferdam box, a first locking joint and a second locking joint, the cofferdam box comprising a first docking wall plate and a second docking wall plate, the first docking wall plate and the second docking wall plate being respectively used to dock with adjacent cofferdam units; a matching piece is arranged on the outer wall of one end of the upper and lower ends of the cofferdam box, and a plug-in module is arranged on the end surface of the other end, and a plug-in space is formed in the plug-in module; the construction method comprises:

[0006] Step S1: Connecting a plurality of preset cofferdam units up and down through plug-in modules and matching parts to form a multi-section cofferdam module;

[0007] Step S2: after hoisting the cofferdam module described in the previous section to the designated location, lowering the current cofferdam module;

[0008] Step S3: After the current cofferdam module is lowered to the specified elevation, the next section of the cofferdam module is hoisted to the upper side of the cofferdam module that has been lowered;

[0009] Step S4: After the next section of the cofferdam module is connected to the cofferdam module that has been lowered through the first locking joint and the second locking joint, the next section of the cofferdam module is lowered until the next section of the cofferdam module is lowered to the specified elevation;

[0010] Step S5: cyclically executing steps S3 and S4 until all the cofferdam modules are surrounded to form an assembled cofferdam.

[0011] In one embodiment, the number of the first locking joints in each of the cofferdam units is two, and the two first locking joints are arranged at intervals along the width direction of the first docking wall plate; the number of the second locking joints in each of the cofferdam units is two, and the two second locking joints are arranged at intervals along the width direction of the second docking wall plate; the step S4 comprises:

[0012] After the next cofferdam module is connected with the cofferdam module that has been lowered through two first locking joints and two second locking joints respectively, the next cofferdam module is lowered until the next cofferdam module is lowered to a specified elevation; wherein, two adjacent cofferdam modules that have been lowered are surrounded by the cooperation of the two first locking joints and the two second locking joints to form a water-stop space;

[0013] After step S5, the following steps are also included:

[0014] Water-stop filling materials are poured and filled in each water-stop space of the assembled cofferdam until the height of the water-stop filling materials in the water-stop space is higher than the current water level.

[0015] In one embodiment, the step S5 further includes:

[0016] The bottom of the assembled cofferdam is sealed with concrete;

[0017] When the bottom seal concrete reaches a preset strength, water is pumped out of the assembled cofferdam, and water leakage of the inner wall of the assembled cofferdam is observed;

[0018] If the leaking location is below the riverbed, the first plugging material is used to plug the inner side of the fabricated cofferdam;

[0019] If the leakage location is above the riverbed, the second plugging material is used to seal the outer side of the assembled cofferdam.

[0020] In one embodiment, the step S5 until the cofferdam modules are surrounded to form an assembled cofferdam includes:

[0021] When each of the cofferdam modules is gathered to the last section, the positions and spacings of the two first locking joints on the cofferdam module spliced ​​with the last section of the cofferdam module and the positions and spacings of the two second locking joints are measured;

[0022] According to the position and spacing of the two first locking joints and the position and spacing of the two second locking joints, the position and spacing of the two first locking joints and the position and spacing of the two second locking joints of the last section of the cofferdam module are set;

[0023] After the first locking joint and the second locking joint of the last section of the cofferdam module are respectively connected with the first locking joint and the second locking joint of the two adjacent cofferdam modules, the last section of the cofferdam module is lowered to surround and form the assembled cofferdam.

[0024] In one embodiment, after the cofferdam module is lowered to the specified elevation, step S3 further includes:

[0025] Measure the current verticality of the cofferdam module described in the first section;

[0026] If the current verticality does not reach the preset verticality, the first section of the cofferdam module is pulled out from the bottom of the riverbed and readjusted and then lowered until the current verticality reaches the preset verticality;

[0027] Measure the current elevation and the current plane position of the cofferdam module described in the first section, and adjust the lowering height and the lowering plane position of the cofferdam module described in the first section according to the current elevation and the current plane position;

[0028] After step S4, the following steps are also included:

[0029] The current elevation and the current plane position of the next section of the cofferdam module are measured, and the lowering height and the lowering plane position of the next section of the cofferdam module are adjusted according to the current elevation and the current plane position.

[0030] In one embodiment, before step S2, the step further includes:

[0031] installing an auxiliary platform and installing a lowering system on the auxiliary platform;

[0032] An inner guide device is installed in the auxiliary platform, and an outer guide device is installed on the steel pipe pile of the auxiliary platform; the inner guide device and the outer guide device are spaced apart, and the cofferdam module can be arranged between the inner guide device and the outer guide device.

[0033] A prefabricated cofferdam, which is used in the construction method as described above, and includes at least two cofferdam units, wherein the cofferdam unit includes a cofferdam box, a first locking joint and a second locking joint, and the cofferdam box includes 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 cofferdam units; at the upper and lower ends of the cofferdam box, a matching piece is provided on the outer wall of one end, and a plug-in module is provided on the end surface of the other end, wherein a plug-in space is formed in the plug-in module; of the two cofferdam units adjacent to each other, the cofferdam unit located above and the cofferdam unit located below are plugged into the plug-in space of the plug-in module through the matching piece to form a cofferdam module, and the matching piece can be limitedly matched with the plug-in module; of the two cofferdam modules adjacent to each other on the left and right, the first locking joint of the cofferdam unit of one cofferdam module is plugged into the second locking joint of the cofferdam unit of the other adjacent cofferdam module.

[0034] In one of the embodiments, the plug-in module is connected to the side wall opening of the first docking wall panel to form a plug-in interface connected to the plug-in space, and the cofferdam unit located above is provided with one end of the mating piece which can be plugged into the plug-in space of the plug-in module of the cofferdam unit located below through the plug-in interface; the length of the first locking joint is consistent with the height of the first docking wall panel, and the two end faces of the first locking joint are respectively flush with the opposite two side edges of the first docking wall panel arranged in the height direction, the length of the second locking joint is consistent with the length of the first locking joint, and the upper end face of the second locking joint is flush with the side of the plug-in module away from the second docking wall panel; when two adjacent cofferdam modules are spliced ​​left and right, the seam of the first locking joints of the two adjacent cofferdam units of one cofferdam module is aligned with the second locking joint of a cofferdam unit of the other cofferdam module, and / or the seam of the second locking joints of the two adjacent cofferdam units of one cofferdam module is aligned with the first locking joint of a cofferdam unit of the other cofferdam module.

[0035] In one of the embodiments, the number of the first locking joints is two, the two first locking joints are both arranged on the first docking wall panel, and the two first locking joints are arranged at intervals along the width direction of the first docking wall panel; the number of the second locking joints is two, the two second locking joints are both 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; each first locking joint of one cofferdam module corresponds to and is plugged into each second locking joint of another adjacent cofferdam module, and the two adjacent cofferdam modules form a water-stop space through the cooperation of the first locking joint and the second locking joint.

[0036] In one embodiment, the bottom and the top of the cofferdam box are both open.

[0037] In one of the embodiments, a hoisting structure is provided on the cofferdam unit located at the top of the cofferdam module, and the hoisting structure is integrally formed on the cofferdam unit.

[0038] Compared with the prior art, the prefabricated cofferdam and its construction method of the present application have the following beneficial effects: during construction, among a plurality of preset groups of cofferdam units, the cofferdam units located at the top and the cofferdam units located at the bottom in each group of cofferdam units are plugged into the plug-in space of the plug-in module through matching parts to form a section of the cofferdam module. After hoisting a section of the cofferdam module to the designated location, lowering the current cofferdam module to the designated elevation, and then hoisting the next section of the cofferdam module, plugging the next section of the cofferdam module with the cofferdam module that has been lowered through the first locking joint and the second locking joint, and then lowering it to the designated elevation until all the cofferdam modules are surrounded to form an assembled cofferdam. During the entire splicing process, there is no need for welding, and the size and weight of the formed single cofferdam module are small, which can reduce the load-bearing requirements for the hoisting equipment and the construction platform. During dismantling, it is only necessary to lift the cofferdam modules one by one, and then disassemble the cofferdam units of each cofferdam module through plug-in modules and matching parts. No cutting or underwater operation is required during the entire dismantling process. The cofferdam unit structure after dismantling is intact and can be reused with reduced or even no subsequent processing, which effectively improves construction efficiency and reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 creative work.

[0041] 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 according to the true scale.

[0042] Figure 1 A top view of an assembled cofferdam in one embodiment.

[0043] Figure 2 It is a top view of two cofferdam units in the spliced ​​state.

[0044] Figure 3 Schematic diagram of the cofferdam unit structure Figure 1 .

[0045] Figure 4 Schematic diagram of the cofferdam unit structure Figure 2 .

[0046] Figure 5 Schematic diagram of the cofferdam unit structure Figure 3 .

[0047] Figure 6 It is a cross-sectional view of the first locking unit and the second locking unit in an unlocked state.

[0048] Figure 7 It is a cross-sectional view of the first locking unit and the second locking unit in a locked state.

[0049] Figure 8 This is a structural schematic diagram of the prefabricated cofferdam under construction.

[0050] Fig. 9 The present invention is a flow chart of a construction method of an assembled cofferdam in one embodiment.

[0051] Description of reference numerals:

[0052] Assembled cofferdam 1; cofferdam unit 10; cofferdam box 100; first docking wall plate 110; first mounting plate 112; first splicing plate 114; second docking wall plate 120; second mounting plate 122; second splicing plate 124; plug-in module 130; plug-in space 131; plug-in port 132; connecting plate 133; plug-in plate 134; limiting groove 135; plug-in component 136; matching component 140; panel 150; first locking joint 200; second locking joint Snap joint 300; steel pipe pile 400; first locking unit 500; first positioning member 510; first rotating member 520; first locking member 530; first locking hole 540; third locking hole 550; fourth locking hole 560; second locking unit 600; second positioning member 610; second rotating member 620; second locking member 630; second locking hole 640; third locking member 650; fourth locking member 660; water-stop space 20; auxiliary platform 30. DETAILED DESCRIPTION

[0053] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0054] See also Figure 1 and Figure 2 The assembled cofferdam 1 in one embodiment of the present application comprises at least two cofferdam units 10. A certain number of cofferdam units 10 are spliced ​​up and down to form a cofferdam module. Each cofferdam module is spliced ​​left and right, and finally gathered together to form an assembled cofferdam 1. The assembled cofferdam 1 of the present application can at least reduce the difficulty and complexity of construction and facilitate secondary use.

[0055] See also Figures 2 to 4 In one embodiment, the cofferdam unit 10 includes a cofferdam box 100, a first locking joint 200 and a second locking joint 300. The cofferdam box 100 includes a first docking wall plate 110 and a second docking wall plate 120. The first docking wall plate 110 and the second docking wall plate 120 are respectively used to dock with adjacent cofferdam units 10. At the upper and lower ends of the cofferdam box 100, a matching piece 140 is provided on the outer wall of one end, and a plug-in module 130 is provided on the end surface of the other end. A plug-in space 131 is formed in the plug-in module 130. In this embodiment, among the two adjacent cofferdam units 10, the cofferdam unit 10 located above and the cofferdam unit 10 located below are plugged into the plug-in space 131 of the plug-in module 130 through the matching piece 140 to form a cofferdam module, and the matching piece 140 can be limitedly matched with the plug-in module 130. In two adjacent cofferdam modules on the left and right, the first locking joint 200 of the cofferdam unit 10 of one cofferdam module is plugged into the corresponding second locking joint 300 of the cofferdam unit 10 of the other adjacent cofferdam module.

[0056] During construction, among the multiple groups of preset number of cofferdam units 10, the cofferdam units 10 located at the top and the cofferdam units 10 located at the bottom in each group of cofferdam units 10 are plugged into the plug-in space 131 of the plug-in module 130 through the matching piece 140 to form a section of the cofferdam module. After hoisting a section of the cofferdam module to the designated location, lower the current cofferdam module to the designated elevation, and then hoist the next section of the cofferdam module, plug the next section of the cofferdam module with the cofferdam module that has been lowered through the first locking joint 200 and the second locking joint 300, and then lower it to the designated elevation until the cofferdam modules are surrounded to form an assembled cofferdam 1. In the entire splicing process, welding is not required, and the size and weight of the formed single cofferdam module are small, which can reduce the load-bearing requirements for the hoisting equipment and the construction platform. During dismantling, it is only necessary to lift the cofferdam modules one by one, and then disassemble the cofferdam units 10 of each cofferdam module through the plug-in module 130 and the matching parts 140. No cutting or underwater operation is required during the entire dismantling process. The structure of the cofferdam unit 10 after dismantling is intact and can be reused without any subsequent processing, thereby effectively improving construction efficiency and reducing construction costs.

[0057] In one embodiment, the number of the first locking joints 200 in each cofferdam unit 10 is two, and the two first locking joints 200 are both arranged on the first docking wall plate 110, and the two first locking joints 200 are arranged at intervals along the width direction of the first docking wall plate 110. The number of the second locking joints 300 in each cofferdam unit 10 is two, and the two second locking joints 300 are both arranged on the second docking wall plate 120, and the two second locking joints 300 are arranged at intervals along the width direction of the second docking wall plate 120. Figure 2 As shown, during splicing, each first locking joint 200 of a cofferdam module corresponds to each second locking joint 300 of another adjacent cofferdam module, and the two adjacent cofferdam modules are surrounded by the cooperation of the first locking joint 200 and the second locking joint 300 to form a water-stopping space 20. By setting the cooperation of two first locking joints 200 and two second locking joints 300, not only can the splicing reliability of the two cofferdam modules be improved, but also it is convenient to form the water-stopping space 20, and improve the water-stopping effect of the splicing position.

[0058] Specifically, 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 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. 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 1 can be changed from a temporary structure to a permanent protective structure, forming a permanent anti-collision structure for the pier cap.

[0059] In one embodiment, the cofferdam unit 10 further includes a steel pipe pile 400, which is inserted into the cofferdam box 100 and fixedly connected to the inner wall of the cofferdam box 100. The steel pipe pile 400 can enhance the structural strength of the cofferdam box 100, so that the assembled cofferdam 1 can be applied in deep water or deep foundation pits. The cofferdam unit 10 effectively combines the advantages of the steel sheet pile cofferdam and the locking steel pipe cofferdam, enhances the structural strength, and improves the applicability in complex geological and deepwater foundation construction, and is easy to splice and has good water-proof properties.

[0060] See also Figures 3 to 5In 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 arranged 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 wall surfaces 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 triangle stability principle to increase the ability of the cofferdam box 100 to resist torsional deformation and reduce the possibility of torsional deformation during splicing and installation construction.

[0061] 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 arranged 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 wall surfaces of the two second splicing plates 124 form a "V"-shaped space. The V-shaped structure formed by the two second splicing plates 124 can utilize the triangle stability principle to increase the ability of the cofferdam box 100 to resist torsional deformation and reduce the possibility of torsional deformation during splicing and installation construction.

[0062] like Figure 2 As shown, when two cofferdam modules are spliced ​​together, that is, two cofferdam units 10 are spliced ​​together, the outer wall surfaces of the two first splicing plates 114 form a "V"-shaped space and the outer wall surfaces of the two second splicing plates 124 form a "V"-shaped space to connect and form a water-stop space 20. The two "V"-shaped spaces can increase the size of the water-stop space 20, thereby facilitating the filling of the water-stop material more densely, solving the problem of narrow water-stop space and difficulty in filling water-stop fillers in the traditional method.

[0063] See also Figures 3 to 5In this embodiment, in two adjacent cofferdam units 10 on the left and right, the two first locking joints 200 of one cofferdam unit 10 can be respectively plugged into the two second locking joints 300 of the other cofferdam unit 10 to enclose a water-stopping 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. 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 water-stopping material. The cofferdam unit 10 of the double CT locking joint of the present application can not only reduce the difficulty of splicing, but also improve the water-stopping effect.

[0064] See also Figure 3 and Figure 4 In this embodiment, the plug-in module 130 is arranged at the upper end of the cofferdam box 100 , and the matching piece 140 is arranged at the lower end of the cofferdam box 100 .

[0065] In one embodiment, the plug-in module 130 is connected to the side wall opening of the first docking wall plate 110 to form a plug-in port 132 connected to the plug-in space 131, and the end of the cofferdam unit 10 located above and provided with the matching piece 140 can be plugged into the plug-in space 131 of the plug-in module 130 of the cofferdam unit 10 located below through the plug-in port 132. By providing the plug-in port 132, it is convenient for the cofferdam unit 10 to be plugged into the plug-in space 131 of another cofferdam unit 10 from the side, thereby improving the convenience of assembly and splicing. Specifically, when the lower end of the cofferdam unit 10 located above is plugged into the plug-in space 131, the bottom wall of the cofferdam unit 10 located above can abut against the cofferdam box 100 of the cofferdam unit 10 located below, thereby improving the reliability of the connection.

[0066] Specifically, the plug-in module 130 includes a connecting plate 133 and two plug-in plates 134, the two plug-in plates 134 are arranged at intervals, the connecting plate 133 is arranged above the second docking wall plate 120, one side of the two plug-in plates 134 is respectively connected to the two opposite sides of the connecting plate 133, the other opposite sides of the two plug-in plates 134 are arranged at intervals to form a plug-in interface 132, and the connecting plate 133 and the two plug-in plates 134 enclose a plug-in space 131. The number of the matching pieces 140 is the same as the number of the plug-in plates 134, and the lower end of the cofferdam unit 10 located above can be plugged into the plug-in space 131 of the plug-in module 130 of the cofferdam unit 10 located below through the plug-in interface 132, so that the matching piece 140 and the plug-in plate 134 are limitedly matched.

[0067] In this embodiment, the cofferdam box 100 further includes two oppositely arranged panels 150 , the first docking wall panel 110 and the second docking wall panel 120 are arranged oppositely with an interval, and the first docking wall panel 110 and the second docking wall panel 120 and the two panels 150 together form the cofferdam box 100 .

[0068] In this embodiment, the plug-in board 134 can be formed by extending the panel 150 of the cofferdam box 100, that is, the plug-in board 134 can be an integrally formed structure with the panel 150. The two plug-in boards 134 are respectively extended from the two opposite panels 150 of the cofferdam box 100, and the plate is bent at the connection between the panel 150 and the plug-in board 134 to form a step supporting the upper cofferdam unit 10. The connecting plate 133 can be formed by extending the second docking wall plate 120, that is, the connecting plate 133 and the second docking wall plate 120 are an integral structure. The plate is bent at the connection between the connecting plate 133 and the second docking wall plate 120 to form a step supporting the upper cofferdam unit 10. By integrally forming the plug-in board 134 and the connecting plate 133 with the plate of the cofferdam box 100, not only the number of processed parts can be reduced, but also the sealing of the connection position and the structural reliability of the connection can be ensured.

[0069] In this embodiment, the plug-in module 130 also includes two plug-in components 136, which are respectively arranged on two plug-in boards 134. The plug-in components 136 may be "C"-shaped locking tubes, and the "C"-shaped locking tubes are arranged on the outer wall surface of the plug-in board 134. The opening of the "C"-shaped locking tubes passes through the plug-in board 134 and is connected with the plug-in space 131. The matching component 140 may be a "T"-shaped steel bar or an "I"-shaped steel bar, and the "T"-shaped steel bar or the "I"-shaped steel bar is inserted into the "C"-shaped locking tube. Since the first locking joint 200 and the second locking joint 300 are respectively a "C"-shaped locking tube and a "T"-shaped steel bar or an "I"-shaped steel, the existing structural parts can be directly used to form the plug-in components 136 and the matching components 140, further reducing the processing difficulty and processing cost.

[0070] In one embodiment, the length of the first locking joint 200 is consistent with the height of the first docking wall plate 110, and the two end surfaces of the first locking joint 200 are flush with the two opposite sides of the first docking wall plate 110 arranged in the height direction, the length of the second locking joint 300 is consistent with the length of the first locking joint 200, and the upper end surface of the second locking joint 300 is flush with the side of the plug-in module 130 away from the second docking wall plate 120. When two adjacent cofferdam modules are spliced ​​left and right, the joint of the first locking joint 200 of the two adjacent cofferdam units 10 of one cofferdam module is aligned with the second locking joint 300 of one cofferdam unit 10 of the other cofferdam module, and / or the joint of the second locking joint 300 of the two adjacent cofferdam units 10 of one cofferdam module is aligned with the first locking joint 200 of one cofferdam unit 10 of the other cofferdam module.

[0071] In the two cofferdam units 10 spliced ​​up and down, one cofferdam unit 10 can be separated from the other cofferdam unit 10 at the plug-in interface 132, but when the formed cofferdam modules are spliced ​​together, for the cofferdam module located in the middle, the joint of the first locking joints 200 of the two adjacent cofferdam units 10 of the middle cofferdam module is aligned with the second locking joints 300 of the cofferdam unit 10 on one side, and the joint of the second locking joints 300 of the two adjacent cofferdam units 10 of the middle cofferdam module is aligned with the first locking joints 200 of the cofferdam unit 10 on the other side. The cofferdam module located in the middle uses the cofferdam modules on both sides to limit its left and right movement. The cofferdam modules are finally spliced ​​to form an annular structure or a square structure connected end to end, which restricts the left and right movement of each cofferdam unit 10 as a whole. The top of the assembled cofferdam 1 after splicing will not have different heights due to the misaligned setting of its joints, nor will it be necessary to set cofferdam units 10 of different heights due to the misaligned setting of its joints.

[0072] See also Figure 3 , Figure 6 and Figure 7 In one embodiment, the cofferdam unit 10 further includes a first locking unit 500 and a second locking unit 600. The first locking unit 500 is arranged on the outer wall of the plug-in module 130 and is located near the side of the plug-in module 130 away from the cofferdam box 100. The second locking unit 600 is arranged on the outer wall of the lower end of the cofferdam box 100 and is located above the matching piece 140. In the two adjacent cofferdam units 10 in the height direction, the second locking unit 600 of the upper cofferdam unit 10 can be locked with the first locking unit 500 of the lower cofferdam unit 10. When the upper and lower cofferdam units 10 are spliced ​​together, the two cofferdam units 10 are locked together by the first locking unit 500 and the second locking unit 600 to prevent the upper and lower cofferdam units 10 from being separated during the lowering process.

[0073] In one embodiment, the first locking unit 500 includes a first positioning member 510, and the first positioning member 510 is a semi-conical structure. The second locking unit 600 includes a second positioning member 610, a second rotating member 620 and a second locking member 630. The second positioning member 610 is a semi-conical structure, and the second rotating member 620 is a semi-circular arc structure. The second rotating member 620 is clamped on the outer arc surface of the second positioning member 610 and can rotate around the center of the second positioning member 610. The second positioning member 610 faces the second rotating member 620 and the second rotating member 620 faces the inner wall of the second positioning member 610. One of the two is provided with the second locking member 630, and the other is provided with a second locking hole 640. In the locked state, part of the second rotating member 620 of the second locking unit 600 of the cofferdam unit 10 located at the top is located on the second positioning member 610, and the other part rotates to the first positioning member 510, so that the second locking member 630 can be inserted into the second locking hole 640.

[0074] like Figure 7 As described above, in the locked state, the second rotating member 620 is located on the side of the first positioning member 510 and the second positioning member 610 facing the plug-in port 132, and the second rotating member 620 is locked on the second positioning member 610 by the second locking member 630, thereby limiting the left and right movement of the upper and lower cofferdam units 10. In this embodiment, the upper surface of the first positioning member 510 can be flush with the upper surface of the plug-in module 130. When spliced ​​together, the upper surface of the first positioning member 510 is aligned with or directly connected to the lower surface of the second positioning member 610.

[0075] In this embodiment, the first locking unit 500 further includes a first rotating member 520 and a first locking member 530. The first rotating member 520 is a semicircular arc structure. The first rotating member 520 is clamped on the outer arc surface of the first positioning member 510 and can rotate around the center of the circle of the first positioning member 510. The first positioning member 510 faces the side of the first rotating member 520 and the first rotating member 520 faces the inner wall of the first positioning member 510. One of the two is provided with the first locking member 530, and the other is provided with the first locking hole 540. In the locked state, part of the first rotating member 520 of the first locking unit 500 of the cofferdam unit 10 located below is located on the first positioning member 510, and the other part rotates to the second positioning member 610, so that the first locking member 530 can be inserted into the first locking hole 540.

[0076] like Figure 7 As described above, in the locked state, part of the first rotating member 520 of the first locking unit 500 of the lower cofferdam unit 10 is located on the first positioning member 510, and the other part is rotated to the second positioning member 610. The cooperation between the first rotating member 520 and the second rotating member 620 improves the reliability of limiting the left and right movements of the upper and lower cofferdam units 10.

[0077] like Figure 6 As shown, in one embodiment, a first locking member 530 is provided on the first positioning member 510, a first locking hole 540 is provided on the inner wall of the first rotating member 520, a third locking hole 550 is further provided on the first positioning member 510, a fourth locking hole 560 is further provided on the inner wall of the first rotating member 520, the direction of the first locking hole 540 toward the fourth locking hole 560 is consistent with the direction of the third locking hole 550 toward the first locking member 530, and both are locking directions c. A second locking hole 640 is provided on the second positioning member 610, a second locking member 630 is provided on the inner wall of the second rotating member 620, a third locking member 650 is further provided on the inner wall of the second rotating member 620, a fourth locking member 660 is further provided on the second positioning member 610, the direction of the second locking member 630 toward the third locking member 650 and the direction of the fourth locking member 660 toward the second locking hole 640 are both locking directions c. As shown Figure 7 As shown, in the locked state, the first locking member 530 is inserted into the first locking hole 540, the fourth locking member 660 of the second positioning member 610 is inserted into the fourth locking hole 560 of the first rotating member 520, the second locking member 630 is inserted into the second locking hole 640, and the third locking member 650 of the second rotating member 620 is inserted into the third locking hole 550 of the first positioning member 510. By arranging the third locking member 650 to cooperate with the third locking hole 550, and the fourth locking member 660 to cooperate with the fourth locking hole 560, the reliability of locking the upper and lower cofferdam units 10 can be further improved.

[0078] See also Figures 1 to 3 In one embodiment, a hoisting structure is provided on the cofferdam unit 10 at the top of the cofferdam module, and the hoisting structure is integrally formed on the cofferdam unit 10. In this embodiment, a plug-in module 130 is provided on the upper end of a single cofferdam unit 10, while the upper end of the cofferdam unit 10 at the top of the single-section cofferdam module is not provided with a plug-in module 130, but a hoisting structure is provided. The hoisting structure facilitates the hoisting equipment to hoist the cofferdam module, and then facilitates the lowering of the cofferdam module, and facilitates the adjustment of the position of the cofferdam module during the lowering process.

[0079] Specifically, the steel pipe pile 400 of the uppermost cofferdam unit 10 extends from the cofferdam box 100 to form a hoisting structure, and a hoisting hole is provided on the portion of the steel pipe pile extending from the cofferdam box 100 to facilitate the fixed installation of the hoisting equipment. By directly extending the steel pipe pile to form a hoisting structure, the connection between the hoisting structure and the cofferdam unit 10 is more reliable and stable, ensuring the reliability during the hoisting process.

[0080] In one embodiment, the bottom and top of the cofferdam box 100 are both open. When the cofferdam units 10 are spliced ​​up and down to form a cofferdam module, the internal space of the cofferdam module can be connected from the bottom to the top. When the cofferdam module is lowered into the river water, the river water can be directly poured into the cofferdam module from the bottom of the cofferdam module. When the cofferdam module is inserted into the bottom of the riverbed, the soil at the bottom of the riverbed can directly enter the cofferdam module, and then during the construction process, there is no need to add concrete or water inside the cofferdam module to increase the counterweight, thereby simplifying the construction process.

[0081] See also Figures 1 to 3 , Figure 8 and Fig. 9 The present application also records a construction method of an assembled cofferdam 1, which is applicable to the assembled cofferdam 1 in the above-mentioned embodiment.

[0082] In one embodiment, the construction method of the assembled cofferdam 1 comprises the following steps:

[0083] Install the auxiliary platform 30, and install the lowering system on the auxiliary platform 30; install the inner guide device in the auxiliary platform 30, and install the outer guide device on the steel pipe pile of the auxiliary platform 30; the inner guide device and the outer guide device are arranged at intervals, and the cofferdam module can be arranged between the inner guide device and the outer guide device. Specifically, the lowering system is installed on the top of the steel casing in the auxiliary platform 30, and the surrounding purlin and inner support are installed on the inside, and the lowering system is lowered a certain distance to serve as the inner guide device. The corbel is welded on the steel pipe pile of the auxiliary platform 30 as the outer guide device.

[0084] Step S1: Multiple groups of preset cofferdam units 10 are spliced ​​up and down through the plug-in module 130 and the matching piece 140 to form a multi-section cofferdam module. Multiple cofferdam units 10 are divided into multiple groups, and each group of cofferdam units 10 can be spliced ​​to form a section of the cofferdam module, and the height of a section of the cofferdam module is the elevation of the assembled cofferdam 1. The preset number of cofferdam units 10 are connected through the plug-in module 130 and the matching piece 140, and the connection process is convenient and simple. They can be connected at the construction site, and then in the process of transportation and manufacturing, only a single cofferdam unit 10 needs to be processed, which reduces the difficulty of processing and transportation.

[0085] Step S2: After hoisting the cofferdam module described in Section 1 to the designated location, lower the cofferdam module described in Section 1. Specifically, a hoisting structure is provided at the top of the cofferdam module, and the lowering system can hoist the cofferdam module through the hoisting structure, and then control the cofferdam module to move between the inner guide device and the outer guide device for positioning, and then control the lowering system to lower the cofferdam module under the guidance of the inner guide device and the outer guide device.

[0086] Step S3: After the current cofferdam module is lowered to the specified elevation, the next section of the cofferdam module is hoisted to the upper side of the cofferdam module that has been lowered.

[0087] Specifically, when the first section of the cofferdam module is lowered to the specified elevation, the first section of the cofferdam module has been driven to the bottom of the riverbed. Then measure the current verticality of the first section of the cofferdam module; if the current verticality does not reach the preset verticality, pull the first section of the cofferdam module from the bottom of the riverbed, readjust it, and then lower it until the current verticality reaches the preset verticality. Measure the current elevation and current plane position of the cofferdam unit 10 of the first section, and adjust the lowering height and plane position of the cofferdam unit 10 of the first section according to the current elevation and current plane position. Since the installation accuracy of the first section of the cofferdam module directly determines the lowering accuracy of the subsequent cofferdam modules, it is necessary to ensure the verticality and position accuracy of the first section of the cofferdam module when it is lowered and driven to the bottom of the riverbed.

[0088] Step S4: After the next section of the cofferdam module is connected to the cofferdam module that has been lowered through the first locking joint 200 and the second locking joint 300, the next section of the cofferdam module is lowered until the next section of the cofferdam module is lowered to the specified elevation.

[0089] Specifically, the current elevation and the current plane position of the next cofferdam module are measured, and the lowering height and the lowering plane position of the next cofferdam module are adjusted according to the current elevation and the current plane position. In the subsequent lowering process of the cofferdam module, it is necessary to ensure the lowering height of the cofferdam module to ensure that the cofferdam module can be stably inserted into the bottom of the riverbed, ensure the lowering plane position to avoid the cofferdam module from tilting left and right, and also ensure the reliability of the connection between the cofferdam module and the adjacent cofferdam module.

[0090] Step S5: cyclically executing steps S3 and S4 until the cofferdam modules are gathered together to form an assembled cofferdam 1.

[0091] Specifically, step S5 includes:

[0092] Step S51: When the cofferdam modules are assembled to the last section, the positions and spacings of the two first locking joints 200 on the cofferdam module to be spliced ​​with the last section of the cofferdam module and the positions and spacings of the two second locking joints 300 are measured;

[0093] Step S52: according to the positions and spacings of the two first locking joints 200 and the positions and spacings of the two second locking joints 300, the positions and spacings of the two first locking joints 200 and the positions and spacings of the two second locking joints 300 of the last section of the cofferdam module are set;

[0094] Step S53: After the first locking joint 200 and the second locking joint 300 of the last section of the cofferdam module are respectively connected with the first locking joint 200 and the second locking joint 300 of the two adjacent cofferdam modules, the last section of the cofferdam module is lowered to surround and form the assembled cofferdam 1.

[0095] In order to prevent difficulties in the final closing, the first locking joint 200 and the second locking joint on the last section of the cofferdam module are welded on site according to actual conditions to ensure that effective closing can be completed. After the cofferdam module of the last section is lowered, the elevation and plane position are measured and verified.

[0096] In one embodiment, the step S5 further includes: pouring and filling water-stop fillers in each water-stop space 20 of the prefabricated cofferdam 1, until the height of the water-stop fillers in the water-stop space 20 is higher than the current water level. Specifically, each water-stop space 20 is filled with a waterproof canvas bag + a water-stop material filled with clay. Since the size of the water-stop space 20 is relatively large, it is possible to ensure that the water-stop space 20 is filled with clay by vibration, and the filling is more dense, so as to achieve the effect of isolating the water flow and ensure the water-stop effect of the prefabricated cofferdam 1. In another embodiment, a mixture of clay, sawdust, and butter can be filled, and the mixture is compacted in the water-stop space 20 by vibration to isolate the water flow channel and ensure the water-stop effect of the prefabricated cofferdam 1.

[0097] In one embodiment, after step S5, the method further includes:

[0098] The bottom of the assembled cofferdam 1 is sealed with concrete;

[0099] When the bottom seal concrete reaches a preset strength, water is pumped out of the assembled cofferdam 1, and the water leakage of the inner wall of the assembled cofferdam 1 is observed;

[0100] If the leaking location is below the riverbed, the first plugging material is used to plug the inner side of the assembled cofferdam 1;

[0101] If the leakage location is above the riverbed, the second plugging material is used to seal the outer side of the assembled cofferdam 1.

[0102] In this embodiment, when the bottom seal concrete reaches 100% strength, water is pumped out of the assembled cofferdam 1 to ensure that the bottom seal concrete is stable and reliable during the pumping process and will not be damaged by the pumping.

[0103] Specifically, if leakage is found during the pumping process, and the leakage position is below the riverbed, the inner side of the assembled cofferdam 1 is sealed with a plugging agent such as glass glue or epoxy resin. When the gap is large, it can be sealed by welding steel plates or plugging wooden tips. If the leakage position is above the riverbed, the outer side of the assembled cofferdam 1 is sealed, and the following measures can be taken: for smaller gaps, the gaps between the cofferdam boxes 100 are filled with slats, cotton wool or hemp wool; for wider gaps, hemp ropes mixed with butter can be used to fill the gaps. A plugging conduit can also be set above the leakage position on the outside of the cofferdam box 100, and the plugging conduit can be used to lower the plugging mixture to the position where the plugging is required. The plugging mixture can be formed by mixing coarse sand, sawdust, cement, etc.

[0104] In this embodiment, during the process of plugging the leak and pumping out water, the deformation of the cofferdam box 100 should be closely observed. If the cofferdam unit 10 is severely deformed, pumping out water should be stopped immediately and the cause should be found out.

[0105] The above-mentioned prefabricated cofferdam 1 and its construction method combine the advantages of steel sheet pile cofferdam and locking steel pipe cofferdam. The prefabricated cofferdam 1 has high structural rigidity and is suitable for deep and large foundation pits or deep waters. The cofferdam box 100 formed by welding steel pipe + steel plate reduces the difficulty of production and facilitates factory production and assembly installation. The double CT locking joint reduces the requirements for insertion accuracy and facilitates water stopping. During splicing and installation, there is no need for on-site welding, which reduces the risk of high-altitude welding operations. During hoisting, no large floating hoisting equipment is required, which reduces the safety risk of occupying the waterway. During dismantling, there is no need for underwater cutting operations. The structure of the cofferdam unit 10 after dismantling is intact, which is convenient for reuse, effectively improving construction efficiency and reducing construction costs.

[0106] In the description of the present application, it should be understood that if the terms "first" and "second" appear, these terms are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0107] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0108] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it 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. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0110] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An assembled cofferdam, characterized in that: The assembled cofferdam includes at least two cofferdam units, the cofferdam unit includes a cofferdam box, a first locking joint and a second locking joint, the cofferdam box includes a first docking wall panel and a second docking wall panel, the first docking wall panel and the second docking wall panel are respectively used to dock with adjacent cofferdam units; at the upper and lower ends of the cofferdam box, a matching piece is arranged on the outer wall of one end, and a plug-in module is arranged on the end surface of the other end, and a plug-in space is formed in the plug-in module; the plug-in module is connected to the side wall opening of the first docking wall panel to form a plug-in interface connected to the plug-in space, the length of the first locking joint is consistent with the height of the first docking wall panel, and the two end surfaces of the first locking joint are respectively flush with the opposite two side edges of the first docking wall panel arranged in the height direction, the length of the second locking joint is consistent with the length of the first locking joint, and the upper end surface of the second locking joint is flush with the side of the plug-in module away from the second docking wall panel; In the two adjacent cofferdam units above and below, the cofferdam unit located above is provided with one end of the matching piece which can be plugged into the plug-in space of the plug-in module of the cofferdam unit located below through the plug-in interface to form a cofferdam module, and the matching piece can cooperate with the plug-in module in a limited manner; in the two adjacent cofferdam modules left and right, the first locking joint of the cofferdam unit of one cofferdam module corresponds to the second locking joint of the cofferdam unit of the other adjacent cofferdam module, the joint of the first locking joint of the two adjacent cofferdam units of one cofferdam module is aligned with the second locking joint of a cofferdam unit of the other cofferdam module, and the joint of the second locking joint of the two adjacent cofferdam units of one cofferdam module is aligned with the first locking joint of a cofferdam unit of the other cofferdam module; wherein, the heights of the cofferdam units in the cofferdam module are consistent.

2. The assembled cofferdam according to claim 1, characterized in that: The plug-in module includes a connecting plate and two plug-in plates, the two plug-in plates are arranged relatively at intervals, the connecting plate is arranged above the second docking wall plate, one side of the two plug-in plates are respectively connected to the opposite two side sides of the connecting plate, the other opposite side sides of the two plug-in plates are arranged at intervals to form the plug-in interface, and the connecting plate and the two plug-in plates enclose the plug-in space; the number of the mating parts is consistent with the number of the plug-in plates, and each of the mating parts is limitedly matched with the corresponding plug-in plate; the cofferdam box body also includes two relatively arranged panels, the first docking wall plate and the second docking wall plate are arranged relatively at intervals, and the plug-in plate is formed by extending the panel of the cofferdam box body; the connecting plate is formed by extending the second docking wall plate.

3. The assembled cofferdam according to claim 1, characterized in that: There are two first locking joints, both of which are arranged on the first docking wall panel, and the two first locking joints are arranged at intervals along the width direction of the first docking wall panel; there are two second locking joints, 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; each first locking joint of one cofferdam module is plugged into each second locking joint of another adjacent cofferdam module, and two adjacent cofferdam modules form a water-stop space through the cooperation of the first locking joint and the second locking joint.

4. The assembled cofferdam according to any one of claims 1 to 3, characterized in that: The bottom and the top of the cofferdam box are both open; and / or a hoisting structure is provided on the cofferdam unit located at the top of the cofferdam module, and the hoisting structure is integrally formed on the cofferdam unit.

5. A method for constructing an assembled cofferdam, the method for constructing an assembled cofferdam being applied to the assembled cofferdam according to claim 1; characterized in that: The construction method comprises: Step S1: Connecting a plurality of preset cofferdam units up and down through plug-in modules and matching parts to form a multi-section cofferdam module; Step S2: after hoisting the cofferdam module described in the previous section to the designated location, lowering the current cofferdam module; Step S3: After the current cofferdam module is lowered to the specified elevation, the next section of the cofferdam module is hoisted to the upper side of the cofferdam module that has been lowered; Step S4: After the next section of the cofferdam module is connected to the cofferdam module that has been lowered through the first locking joint and the second locking joint, the next section of the cofferdam module is lowered until the next section of the cofferdam module is lowered to the specified elevation; Step S5: cyclically executing steps S3 and S4 until all the cofferdam modules are surrounded to form an assembled cofferdam.

6. The construction method of the assembled cofferdam according to claim 5, wherein the number of the first locking joints in each of the cofferdam units is two, and the two first locking joints are spaced apart along the width direction of the first docking wall plate, and the number of the second locking joints in each of the cofferdam units is two, and the two second locking joints are spaced apart along the width direction of the second docking wall plate; characterized in that: The step S4 comprises: After the next cofferdam module is connected with the cofferdam module that has been lowered through two first locking joints and two second locking joints respectively, the next cofferdam module is lowered until the next cofferdam module is lowered to a specified elevation; wherein, two adjacent cofferdam modules that have been lowered are surrounded by the cooperation of the two first locking joints and the two second locking joints to form a water-stop space; After step S5, the following steps are also included: Water-stop filling materials are poured and filled in each water-stop space of the assembled cofferdam until the height of the water-stop filling materials in the water-stop space is higher than the current water level.

7. The construction method of the assembled cofferdam according to claim 6, characterized in that: After step S5, the following steps are also included: The bottom of the assembled cofferdam is sealed with concrete; When the bottom seal concrete reaches a preset strength, water is pumped out of the assembled cofferdam, and water leakage of the inner wall of the assembled cofferdam is observed; If the leaking location is below the riverbed, the first plugging material is used to plug the inner side of the fabricated cofferdam; If the leakage location is above the riverbed, the second plugging material is used to seal the outer side of the assembled cofferdam.

8. The construction method of the assembled cofferdam according to claim 6, characterized in that: The step S5, until the cofferdam modules are surrounded to form an assembled cofferdam, comprises: When the cofferdam modules are gathered to the last section, the positions and spacings of the two first locking joints on the cofferdam module to be spliced ​​with the last section of the cofferdam module and the positions and spacings of the two second locking joints are measured; According to the position and spacing of the two first locking joints and the position and spacing of the two second locking joints, the position and spacing of the two first locking joints and the position and spacing of the two second locking joints of the last section of the cofferdam module are set; After the first locking joint and the second locking joint of the last section of the cofferdam module are respectively connected with the first locking joint and the second locking joint of the two adjacent cofferdam modules, the last section of the cofferdam module is lowered to surround and form the assembled cofferdam.

9. The construction method of the assembled cofferdam according to any one of claims 5 to 8, characterized in that: After the cofferdam module is lowered to the specified elevation, step S3 further includes: Measure the current verticality of the cofferdam module described in the first section; If the current verticality does not reach the preset verticality, the first section of the cofferdam module is pulled out from the bottom of the riverbed and readjusted and then lowered until the current verticality reaches the preset verticality; Measure the current elevation and the current plane position of the cofferdam module described in the first section, and adjust the lowering height and the lowering plane position of the cofferdam module described in the first section according to the current elevation and the current plane position; After step S4, the following steps are also included: The current elevation and the current plane position of the next section of the cofferdam module are measured, and the lowering height and the lowering plane position of the next section of the cofferdam module are adjusted according to the current elevation and the current plane position of the next section of the cofferdam module.

10. The construction method of the assembled cofferdam according to any one of claims 5 to 8, characterized in that: Before step S2, the following steps are also included: installing an auxiliary platform and installing a lowering system on the auxiliary platform; An inner guide device is installed in the auxiliary platform, and an outer guide device is installed on the steel pipe pile of the auxiliary platform; the inner guide device and the outer guide device are spaced apart, and the cofferdam module can be arranged between the inner guide device and the outer guide device.

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