Modular steel cofferdam, construction device and construction method thereof

Abstract

The present application relates to a kind of modular steel cofferdam, including steel plate, support truss, joint frame, joint piece, the present application also provides special construction device of modular steel cofferdam, including connecting head, steel rope one, hoisting frame, traction assembly, balance adjusting assembly, steel rope two and connecting hook.The steel cofferdam provided by the present application is convenient to butt joint, the opening structure design of the upper end of joint frame reduces the difficulty of joint piece preliminary insertion into joint frame inside, shortens the time of alignment, the construction device provided by the present application adopts the design concept of " one static one dynamic " to adjust the balance condition of steel cofferdam after splicing, the right end of steel cofferdam after splicing is fixed point hoisting by the way of suspension traction, the component of detection, adjustment balance is placed above the left end of steel cofferdam after splicing, when steel cofferdam is not in horizontal state, only need to adjust the left end height of steel cofferdam by the collection and release of left steel rope one, until reach horizontal state can power off and stop operation.

Description

Technical Field

[0001] This invention relates to the field of steel cofferdam construction, specifically a modular steel cofferdam, construction device, and construction method. Background Technology

[0002] With the increasing number of long-span bridges and water-based construction projects, the construction of underwater foundations is crucial. Steel cofferdams, as an important temporary structure in underwater foundation construction, are temporary retaining steel structures built in water conservancy projects to support the construction of permanent water facilities. Their function is to prevent water and soil from entering the construction site, facilitating drainage within the cofferdam, excavation of the foundation pit, and construction of the structure. Due to their many advantages, they show great promise for application in underwater foundation construction. Currently, existing steel cofferdam technologies (such as...) are also used in the repair of flap gates in reservoirs. Figure 14 The steel cofferdam is used to achieve drainage, thus enabling waterless operations.

[0003] The construction of steel cofferdams requires steps such as assembly and launching. The following problems are often encountered during construction:

[0004] 1. Existing steel cofferdams are difficult to align in one go during hoisting and assembly, and may require multiple fine adjustments to achieve alignment, which is inefficient. In addition, trapezoidal steel cofferdams are mostly connected by utilizing the surrounding terrain, which can lead to difficulties in connection when the surrounding terrain is unfavorable.

[0005] 2. During the lowering of the steel cofferdam, the varying lengths of the ropes in the lifting equipment can lead to inconsistent lifting points, resulting in the cofferdam not being level. This can cause positional shifts and tilting, and further shifting after being lowered into the water. Because the assembled steel cofferdam is heavy and bulky, it is difficult to rebalance it as a whole, and the operation is cumbersome and complicated. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides a modular steel cofferdam, construction device, and construction method thereof.

[0007] The technical problem to be solved by this invention is achieved by the following technical solution: a modular steel cofferdam, including steel plates, supporting trusses, snap-fit ​​frames, and snap-fit ​​components. The supporting trusses are connected between the steel plates. A snap-fit ​​frame is installed at the front end of the steel plate. The upper end of the snap-fit ​​frame has an open structure. The open structure design reduces the difficulty of initially inserting the snap-fit ​​component into the snap-fit ​​frame and reduces the possibility of misalignment and failure to insert. A snap-fit ​​component is installed at the rear end of the steel plate. When snapping adjacent segmented steel cofferdams together, they are assembled by butt joint. The snap-fit ​​component is snapped into the snap-fit ​​frame to temporarily snap the adjacent segmented steel cofferdams together, and then further position locking is performed later.

[0008] In the construction of modular steel cofferdams, in addition to commonly used gantry cranes, pouring machines, and sludge suction machines, the aforementioned specialized construction device for modular steel cofferdams is also involved. This device is used to adjust the horizontal state of the steel cofferdam. The device includes a connector, a first steel rope, a lifting frame, a traction component, a balance adjustment component, a second steel rope, and a connecting hook. The left end of the connector is connected to the upper end of the first steel rope, and the lower end of the first steel rope passes through the traction component and connects to the lifting frame arranged on the left. The traction component is installed on the outer wall of the lifting frame arranged on the left. The traction component pulls the lower end of the first steel rope back and forth, thereby adjusting the height of the left end of the modular steel cofferdam. Balance adjustment components are symmetrically arranged at both ends inside the lifting frame. The structure between the balance adjustment component and the traction component is coordinated. The right end of the connector is connected to the lifting frame arranged on the right through the second steel rope. Connecting hooks are symmetrically and rotatably arranged at both ends of the lifting frame. The connecting hooks are connected to the supporting truss, providing a temporary hooking state, and the rotatable connection of the connecting hooks facilitates the connection.

[0009] The balance adjustment assembly includes a gravity component, a connecting cylinder, a T-frame, a contact plate, a power supply unit, an electric push rod, and a pushing component. The gravity component is rotatably connected to the lifting frame. A connecting cylinder is located in the middle of the gravity component, and its extended end is connected to the T-frame. The lower middle part of the T-frame is connected to the contact plate by a pin. Power supply units are symmetrically arranged at both ends of the gravity component. The power supply units are electrically connected to the electric push rods mounted on the gravity component. A pushing component is installed on the output end of the electric push rod. The pushing component is engaged with the traction assembly. When the contact plate is in a horizontal state and does not trigger any position of the power supply unit, the power supply unit is in an open circuit state. Adjusting the angle of the contact plate controls the opening and closing of the power supply unit's circuit. The electric push rod arranged on the right drives the pushing component backward, and the electric push rod arranged on the left drives the pushing component forward. The two pushing directions are opposite, respectively controlling the winding and unwinding of the steel rope.

[0010] As a preferred embodiment of the present invention, the traction assembly includes a connecting shell, a reversing roller, a resistance slider, and a guide rail frame. The connecting shell is installed on the outer wall of the hoisting frame arranged on the left side. The reversing roller is rotatably arranged inside the connecting shell, and the reversing roller plays the role of reversing direction. The lower end of the steel rope passes through the connecting shell and the reversing roller in sequence and is connected to the resistance slider. The resistance slider is slidably arranged in the guide rail groove opened in the hoisting frame, and the lower end of the resistance slider is connected to the arc-shaped guide rail frame.

[0011] As a preferred embodiment of the present invention, the left and right ends of the resistance slider are elastically connected to resistance members. The outer end of the resistance member is a spherical structure. The outer end of the resistance member is temporarily engaged in a spherical groove opened in the side wall of the guide rail groove. When the resistance slider is pushed with a slight force, the position of the resistance slider will not move back and forth due to the engagement between the elastically connected resistance member and the spherical groove. As the force increases, when a certain value is reached, even if the resistance member is engaged with the spherical groove, the resistance member is squeezed and compressed back into the resistance slider under the action of force. At this time, the resistance member is no longer engaged with the spherical groove, and the resistance slider can move smoothly.

[0012] As a preferred embodiment of the present invention, the pusher is engaged in the guide rail frame. When the electric push rod is not energized, the pusher only moves in a circular motion on the guide rail frame and does not drive the guide rail frame to move back and forth. The cross-section of the guide rail frame is a T-shaped structure.

[0013] As a preferred embodiment of the present invention, the power supply unit includes a power supply, an insulating shell, a conductive block, a contact block, and an elastic telescopic rod. Hidden slots are symmetrically provided at both ends of the gravity component. An insulating shell is provided at the side end of the T-shaped frame. The power supply located in the hidden slot, the conductive block located in the insulating shell, and the electric push rod are electrically connected. The power supply provides power. The contact block, which cooperates with the conductive block, is installed at the lower end of the elastic telescopic rod. The upper end of the elastic telescopic rod, made of insulating material, is connected to the insulating shell. The elastic telescopic rod always tends to push the contact block downwards.

[0014] As a preferred embodiment of the present invention, the lower end of the contact block is provided with an insulating post. After the rotating contact plate contacts the insulating post, it is pushed up synchronously with the contact block, thereby triggering the circuit. The contact block is made of conductive material.

[0015] As a preferred embodiment of the present invention, the pushing component includes a U-shaped component, a baffle, a movable block, a built-in spring, a snap-fit ​​component, and a tension rope. The upper end of the U-shaped component is connected to the outer wall of the baffle via a hinge, and the inner side of the baffle is connected to the U-shaped component via a tension rope. A movable block is slidably disposed in a movable groove opened in the middle of the U-shaped component. A built-in spring is connected between the movable block and the movable groove, and the built-in spring plays a role in resetting the movable block. A connecting rope is connected between the snap-fit ​​component at the lower end of the baffle and the movable block. The movable block is connected to the extended end of the electric push rod.

[0016] In a preferred embodiment of the present invention, the snap-fit ​​component includes a snap-fit ​​block, a connecting spring, a pressing block, a pressure-bearing block, and a working spring. The snap-fit ​​block is slidably disposed in an internal groove at the lower end of the baffle. A connecting spring connects the snap-fit ​​block to the internal groove, serving a resetting function. A snap-fit ​​groove is formed on the inner side of the snap-fit ​​block. The pressing block, corresponding to the snap-fit ​​groove, is horizontally slidably disposed in a T-shaped groove in the baffle. A drag-reducing roller, in contact with the inclined surface of the pressing block, is rotatably disposed on the pressure-bearing block. A working spring connects the upper end of the pressure-bearing block to the T-shaped groove, and the working spring continuously pushes the pressure-bearing block downwards. The trend is such that the baffle, which does not play a pushing role, is usually connected to the U-shaped part by a hinge. At this time, it may be squeezed by the moving guide rail, causing the baffle to adjust its angle. When the baffle adjusts its angle to the outside, the lower end of the pressure block is not squeezed and moves downward under the action of elasticity. At this time, the descending pressure block squeezes the pressing block to move outward, so that it is inserted into the locking groove, thereby locking the position of the locking block. This prevents the locking block from being passively inserted into the port position of the U-shaped groove due to the downward pulling movement of the connecting rope when the baffle adjusts its angle, which would prevent the baffle from rotating outward smoothly.

[0017] As a preferred embodiment of the present invention, a connecting rope is connected between the snap-fit ​​block and the movable block. The connecting rope is located in the U-shaped groove of the U-shaped component, and the port position of the U-shaped groove corresponds to the position of the built-in groove.

[0018] As a preferred embodiment of the present invention, a sliding block is provided on the outer edge of the contact plate. The sliding block at the initial height is engaged with the slide rail, which is set on the connecting plate. The connecting plate is installed on the lower side wall of the hoisting frame. When the contact plate is not lowered, the angle of the contact plate cannot change under the action of the sliding block and the slide rail, thereby positioning the angle of the gravity component. Due to the unequal width of the modular steel cofferdam, the angle of the steel rope in the traction is unequal, resulting in the unequal angle of the hoisting frame. Before the contact plate is lowered, the gravity component cannot be guaranteed to be in a vertical state but is in a locked state, ensuring the stability during its adjustment process and preventing swaying. After the contact plate is lowered, it indicates that the level needs to be adjusted. Then, the T-shaped frame and the contact plate are lowered as a whole by the connecting cylinder, thereby unlocking the angle adjustment of the contact plate.

[0019] Furthermore, the present invention also provides a construction method for a modular steel cofferdam, comprising the following steps:

[0020] S1. Assembly: The segmented steel cofferdam is assembled into a whole at the dock. After the assembly is completed, a steel wire mesh is laid at the bottom of the steel cofferdam, and a layer of non-woven fabric is laid on the steel wire mesh. Then, it is lifted onto the deck barge by a gantry crane and transported to the site to complete the initial positioning.

[0021] S2. Lifting and Leveling Adjustment: The bottom section of the steel cofferdam is lifted off the deck barge using the lifting equipment on the gantry. It is left to stand for 2-3 minutes. During this time, the balance of the bottom section of the steel cofferdam is adjusted by the traction component and the balance adjustment component. When the bottom section of the steel cofferdam is not level, the power supply is turned on to control the electric push rods to drive the corresponding pushers to adjust back and forth. The level of the bottom section of the steel cofferdam is adjusted by the raising and lowering of the steel cable through the traction component. After the leveling is adjusted, the lifting equipment is used to continue lifting it to a height that allows the deck barge to exit. After the deck barge exits, the lifting cable is slowly released, and the bottom section of the steel cofferdam is smoothly lowered into the water.

[0022] S3. Lifting: When the first set of steel cofferdams is lowered into the bottom of the channel, its top surface should be above the water surface. After the first set of steel cofferdams has sunk to a stable state, the lifting equipment is released. Then, the second set of steel cofferdams is lifted by a crane boat and positioned so that the upper and lower sections of the steel cofferdams are aligned. Then, the lifting cable is lowered so that the two sections contact each other and the position is locked. This process is repeated to lift the formed steel cofferdams and lower them to a stable position.

[0023] S4. Waterproofing tarpaulin laying: Unfold and lay the waterproofing tarpaulin flat on the top platform of the heightened steel cofferdam, and then put sandbags on the waterproofing tarpaulin to compact it with the riverbed.

[0024] S5. Drainage: After the waterproof cloth is laid, the water inside the steel cofferdam is pumped out using a drainage pump. During the drainage process, the stability and seepage of the cofferdam are closely monitored. If seepage is found, sandbags are placed at the corresponding seepage points to press down the bottom. If the cofferdam is found to be deformed, drainage is stopped immediately, the cause is analyzed, and reinforcement is carried out.

[0025] S6. Drying: After the water levels on both sides of the cofferdam are balanced, use a crane to lock the lifting ring at the float of the sandbag and lift the sandbags out to the bank one by one to dry. After all the sandbags are cleaned, the waterproof cloth floats to the surface. Use a crane to lock the lifting strap in the middle of the waterproof bag and lift the waterproof cloth out to the riverbank to dry.

[0026] S7. Bottom Sealing: The bottom of the steel cofferdam is sealed by pouring underwater concrete using the vertical tremie pipe method.

[0027] S8. Cleanup: Use boats to completely remove all construction debris from the river channel.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The modular steel cofferdam provided by the present invention is easy to connect. The design of the opening structure at the upper end of the snap-fit ​​frame reduces the difficulty of initially inserting the snap-fit ​​parts into the snap-fit ​​frame, shortens the alignment time, and can be successfully connected without considering the terrain when overlapping.

[0030] 2. The modular steel cofferdam construction device provided by this invention adopts the design concept of "one static and one dynamic" to adjust the balance of the assembled steel cofferdam. The right end of the assembled steel cofferdam is hoisted to a fixed point by means of suspension traction. The component for detecting and adjusting the balance is placed above the left end of the assembled steel cofferdam. When the steel cofferdam is not in a horizontal state, the height of the left end of the steel cofferdam can be adjusted by simply pulling and releasing the steel rope on the left side until it reaches a horizontal state. At this time, the power is cut off and the operation is stopped. At this time, it is in a balanced state. Then it is launched into the water and unhooked. Compared with the adjustment of the overall balance, this application adjusts the height of one side, which reduces the lifting force and the difficulty of operation.

[0031] 3. The balance adjustment component provided by the present invention is used to detect the horizontal status of the upper left end of the assembled steel cofferdam. When it is not in a horizontal state, the contact plate and the T-shaped frame are no longer arranged perpendicularly. The rotating contact plate triggers the corresponding power supply group, thereby triggering the electric push rod to drive the pusher to move forward or backward, and then cooperates with the traction component to retract the lower end of the steel rope. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a three-dimensional structural schematic diagram of the modular steel cofferdam of the present invention;

[0034] Figure 2 This is a construction flowchart of the present invention;

[0035] Figure 3 This is a schematic diagram of the construction device of the present invention;

[0036] Figure 4 This is a first structural schematic diagram of the steel rope, hoisting frame, traction assembly, balance adjustment assembly and connecting hook of the present invention;

[0037] Figure 5 This is a second structural schematic diagram of the steel rope, hoisting frame, traction assembly, balance adjustment assembly and connecting hook of the present invention;

[0038] Figure 6 This is the present invention. Figure 4 A sectional view;

[0039] Figure 7 This is a cross-sectional view of the electric push rod, the pusher, and the guide rail frame of the present invention;

[0040] Figure 8 This is the present invention. Figure 4 A magnified view of the area at point X;

[0041] Figure 9 This is the present invention. Figure 6 A magnified view of the area at point Y;

[0042] Figure 10 This is the present invention. Figure 7 A magnified view of the Z-axis;

[0043] Figure 11 This is a schematic diagram showing the hoisting position between the assembled steel cofferdam and this application;

[0044] Figure 12 This is a schematic diagram of the assembly of a modular steel cofferdam;

[0045] Figure 13 This is a plan view of the modular steel cofferdam;

[0046] Figure 14 This is a schematic diagram of a trapezoidal steel cofferdam. Detailed Implementation

[0047] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the following is a summary... Figures 1 to 14 The present invention will be further described below.

[0048] A modular steel cofferdam includes steel plates 1, supporting trusses 2, snap-fit ​​frames 3, and snap-fit ​​components 4. The supporting trusses 2 are connected between the steel plates 1. The snap-fit ​​frames 3 are installed at the front end of the steel plates 1. The upper end of the snap-fit ​​frames 3 has an open structure. The open structure design reduces the difficulty of initially inserting the snap-fit ​​components 4 into the snap-fit ​​frames 3 and reduces the possibility of misalignment and failure to insert. The snap-fit ​​components 4 are installed at the rear end of the steel plates 1. When snapping together adjacent segmented steel cofferdams, they are assembled by butt joint. The snap-fit ​​components 4 are snapped into the snap-fit ​​frames 3 to temporarily snap together adjacent segmented steel cofferdams. Further positioning is then performed later. After assembly, a wire mesh is laid at the lower end (water-facing side) of the steel cofferdam. The wire mesh is fixed to the supporting trusses 2 with saddle bolts. In addition, to prevent damage to the waterproof cloth by the trusses and wire mesh, a layer of non-woven fabric can be laid on the wire mesh.

[0049] After the steel cofferdam is heightened, a waterproof tarpaulin is laid on its top platform. The waterproof tarpaulin is custom-made into a double-layer integrated form of 28 meters * 15 meters. In order to facilitate laying, dismantling and hoisting, an air chamber and hoisting strap are set in the middle of the waterproof tarpaulin, and the 15cm range around the edges is reinforced. For the laying of the waterproof tarpaulin, the tarpaulin is first folded into a 28-meter-long shaft and transported to the top platform of the cofferdam. Large ropes are used to secure the ends of the tarpaulin on the bank, the roof of the semi-circular island, and in the river channel, pulling it forward. Personnel at the top of the cofferdam then open the tarpaulin. After the inflated portion of the tarpaulin is flattened, it is inflated to allow it to float on the water surface. The tarpaulin is then stretched forward until it is completely flat. During this stretching process, it is strictly forbidden for the tarpaulin to enter the water. After it is completely flattened, a sandbag is fixed at each meter along the end of the tarpaulin (the sandbags are custom-made from the tarpaulin into 100cm*50cm barrel-shaped bags, with a pull-out lock on the bag opening and a 2.5-meter-long rope. A lifting ring is attached to the end of the rope, and a plastic float is fixed at the end. The sandbags are filled with 3 / 4 coarse sand). After the sandbags are fixed, the tarpaulin is deflated, and the end of the tarpaulin is submerged in the water to compact it against the riverbed.

[0050] In the construction of modular steel cofferdams, in addition to commonly used gantry cranes, pouring machines, and sludge suction machines, the aforementioned specialized construction device for modular steel cofferdams is also involved. This device is used to adjust the horizontal state of the steel cofferdam. The device includes a connector 5, a first steel rope 6, a lifting frame 7, a traction assembly 8, a balance adjustment assembly 9, a second steel rope 10, and a connecting hook 11. The left end of the connector 5 is connected to the upper end of the first steel rope 6, and the lower end of the first steel rope 6 passes through the traction assembly 8 and is connected to the lifting frame 7 arranged on the left side. The traction assembly 8 is installed on the outer wall of the lifting frame 7 arranged on the left side. The traction component 8 pulls the lower end of the steel rope 6 back and forth, thereby adjusting the height of the left end of the modular steel cofferdam. The front and rear ends of the hoisting frame 7 are symmetrically equipped with balance adjustment components 9. The structure between the balance adjustment components 9 and the traction component 8 is coordinated. The right end of the connector 5 is connected to the hoisting frame 7 arranged on the right side through the steel rope 10. The front and rear ends of the hoisting frame 7 are symmetrically equipped with connecting hooks 11. The connecting hooks 11 are connected to the support truss 2, which is temporarily hooked. The rotational connection of the connecting hooks 11 facilitates the connection.

[0051] The balance adjustment assembly 9 includes a gravity component 91, a connecting cylinder 92, a T-shaped frame 93, a contact plate 94, a power supply unit 95, an electric push rod 96, and a pushing component 97. The gravity component 91 is rotatably connected to the lifting frame 7. The connecting cylinder 92 is located in the middle of the gravity component 91, and its extended end is connected to the T-shaped frame 93. The lower middle part of the T-shaped frame 93 is connected to the contact plate 94 by a pin. The power supply unit 95 is symmetrically arranged at both ends of the gravity component 91. The power supply unit 95 is connected to the electric push rod 96 mounted on the gravity component 91. The connection is electrical. A pusher 97 is installed on the output end of the electric push rod 96. The pusher 97 is engaged with the traction assembly 8. When the contact plate 94 is in a horizontal state, it does not trigger the power supply group 95 at any position. At this time, the power supply group 95 is in an open circuit state. The angle adjustment of the contact plate 94 controls the opening and closing of the circuit of the power supply group 95. The electric push rod 96 arranged on the right drives the pusher 97 to push backward, and the electric push rod 96 arranged on the left drives the pusher 97 to push forward. The two push directions are opposite, respectively controlling the winding and unwinding of the steel rope 6.

[0052] In practice, after the bottom section of the steel cofferdam is lifted and left to stand, the T-frame 93 and contact plate 94 are lowered as a whole by connecting cylinder 92. After lowering, the contact plate 94 is unlocked and freely overlaps the upper surface of the steel cofferdam. When the upper surface of the steel cofferdam is not horizontal, the contact plate 94 is simultaneously adjusted at an angle, which triggers the corresponding power supply group 95 at the end of the upward angle adjustment, thereby triggering the electric push rod 96 to drive the push component 97 to move, thus playing a role in winding and unwinding the steel rope 6, thereby adjusting the height of the left side of the modular steel cofferdam (the sectioned steel cofferdam is assembled into a modular steel cofferdam) until the upper surface of the steel cofferdam is horizontal. At this time, the contact plate 94 is not in contact with any power supply group 95. After the electric push rod 96 is de-energized, it stops winding and unwinding the steel rope 6. At this time, the modular steel cofferdam is horizontal, and the adjustment is completed.

[0053] The traction assembly 8 provided in this application mainly pulls the lower end of the steel rope 6 back and forth, thereby playing a role in raising and lowering. Specifically, the traction assembly 8 includes a connecting shell 81, a reversing roller 82, a resistance slider 83, and a guide rail frame 84. The connecting shell 81 is installed on the outer wall of the hoisting frame 7 arranged on the left side. The reversing roller 82 is rotatably arranged inside the connecting shell 81, and the reversing roller 82 plays a role in changing direction. The lower end of the steel rope 6 passes through the connecting shell 81 and the reversing roller 82 in sequence and is connected to the resistance slider 83. The resistance slider 83 is slidably arranged in the guide rail groove opened in the hoisting frame 7. The lower end of the resistance slider 83 is connected to the arc-shaped guide rail frame 84. The left and right ends of the resistance slider 83 are elastically connected to resistance elements, and the outer end of the resistance element is a ball. The structure has a surface structure. The outer end of the resistance element is temporarily engaged in a spherical groove opened in the side wall of the guide rail groove. When the resistance slider 83 is pushed with a slight force, the position of the resistance slider 83 will not move back and forth due to the engagement between the elastically connected resistance element and the spherical groove. As the force increases, when a certain value is reached, even if the resistance element is engaged with the spherical groove, the resistance element will be squeezed and compressed back into the resistance slider 83 under the action of force. At this time, the resistance element is no longer engaged with the spherical groove, and the resistance slider 83 can move smoothly. The pusher 97 is engaged in the guide rail frame 84. When the electric push rod 96 is not energized, the pusher 97 only moves in a ring on the guide rail frame 84 and will not drive the guide rail frame 84 to move back and forth. The cross-section of the guide rail frame 84 is a T-shaped structure.

[0054] During the actual deployment and retrieval process, the pusher 97 drives the guide rail frame 84 to move back and forth. When the guide rail frame 84 moves backward, it pulls the lower end of the steel rope 6 backward, shortening the length of the steel rope 6 exposed between the upper end of the connecting shell 81 and the connecting head 5, thereby increasing the height of the left end of the modular steel cofferdam. When the guide rail frame 84 moves forward, it pulls the lower end of the steel rope 6 forward, increasing the length of the steel rope 6 exposed between the upper end of the connecting shell 81 and the connecting head 5, thereby reducing the height of the left end of the modular steel cofferdam.

[0055] When the contact plate 94 is not in balance, the start switch in the power supply group 95 will be triggered, thereby driving the electric push rod 96 to work. The power supply group 95 specifically includes a power supply 951, an insulating shell 952, a conductive block 953, a contact block 954, and an elastic telescopic rod 955. The gravity member 91 has symmetrical hidden slots at both ends. The side end of the T-shaped frame 93 is provided with an insulating shell 952. The power supply 951 is installed in the hidden slot, the conductive block 953 is installed in the insulating shell 952, and the electric push rod 96 is installed in the electric push rod 96. The circuit is electrically connected, and the power supply 951 provides power. The contact block 954, which cooperates with the conductive block 953, is installed at the lower end of the elastic telescopic rod 955. The upper end of the elastic telescopic rod 955, which is made of insulating material, is connected to the insulating shell 952. The elastic telescopic rod 955 is always pushing the contact block 954 downward. The lower end of the contact block 954 is provided with an insulating post. After the rotating contact plate 94 contacts the insulating post, it pushes the contact block 954 upward synchronously, thereby triggering the circuit. The contact block 954 is made of conductive material.

[0056] During the actual circuit opening and closing process, after the contact plate 94 is lowered and freely overlaps with the upper end of the steel cofferdam, when the modular steel cofferdam is not in a horizontal state, its upper end will be arranged at an angle. The contact plate 94 is adjusted synchronously so that the end with the upward angle adjustment contacts the insulating column, and drives the contact block 954 to rise synchronously. After the contact block 954 rises, it contacts the conductive block 953, so that the power supply group 95 and the electric push rod 96 form a complete circuit. At this time, after the electric push rod 96 is energized, it drives the pusher 97 to move forward or backward.

[0057] The guide rail frame 84 is moved back and forth by the pusher 97, thereby driving the lower end of the steel rope 6 to move back and forth, thus playing the role of winding and unwinding the steel rope 6. Specifically, the pusher 97 includes a U-shaped part 971, a baffle 972, a movable block 973, an internal spring 974, a snap-fit ​​part 975, and a tension rope 976. The upper end of the U-shaped part 971 is connected to the outer wall of the baffle 972 by a hinge. The inner side of the baffle 972 is connected to the U-shaped part 971 by the tension rope 976. The movable block 973 is slidably arranged in the movable groove opened in the middle of the U-shaped part 971. The internal spring 974 is connected between the movable block 973 and the movable groove. The internal spring 974 plays the role of resetting the movable block 973. The snap-fit ​​part 975 at the lower end of the baffle 972 is connected to the movable block 973 by a connecting rope. The movable block 973 is connected to the extended end of the electric push rod 96.

[0058] The snap-fit ​​component 975 includes a snap-fit ​​block 9751, a connecting spring 9752, a pressing block 9753, a pressure-bearing block 9754, and a working spring 9755. The snap-fit ​​block 9751 is slidably disposed in an internal groove at the lower end of the baffle 972. A connecting spring 9752 connects the snap-fit ​​block 9751 to the internal groove, serving a resetting function. A snap-fit ​​groove is formed on the inner side of the snap-fit ​​block 9751. The pressing block 9753, corresponding to the snap-fit ​​groove, is horizontally slidably disposed in a T-shaped groove in the baffle 972. A drag-reducing roller, in contact with the inclined surface of the pressing block 9753, is rotatably disposed on the pressure-bearing block 9754. A working spring 9755 connects the upper end of the pressure-bearing block 9754 to the T-shaped groove. The working spring 9755 always exerts a downward pushing force on the pressure-bearing block 9754. The baffle 972 and the U-shaped component do not exert a pushing force. The connection between 971 is usually hinged. At this time, the baffle 972 may be squeezed by the moving guide rail 84, causing the baffle 972 to adjust its angle. When the baffle 972 adjusts its angle outward, the lower end of the pressure block 9754 is not squeezed and moves downward under the action of elasticity. At this time, the descending pressure block 9754 squeezes the pressure block 9753 to move outward, so that it is inserted into the locking groove, thereby locking the position of the locking block 9751. This prevents the baffle 972 from being pulled downward under the action of the connecting rope when the angle is adjusted, which would cause the locking block 9751 to be passively inserted into the port position of the U-shaped groove, causing the baffle 972 to be unable to rotate outward smoothly. The locking block 9751 and the movable block 973 are connected by a connecting rope, which is located in the U-shaped groove opened in the U-shaped part 971. The port position of the U-shaped groove corresponds to the position of the built-in groove.

[0059] In the actual adjustment process, taking the electric push rod 96 arranged on the right as an example, the electric push rod 96 on the right drives the pusher 97 to move backward. During the movement, due to the setting of the resistance component, the position of the resistance slider 83 and the guide rail frame 84 is temporarily stopped. The electric push rod 96 drives the movable block 973 to move backward. Under the action of the connecting rope, the locking block 9751 arranged in front moves downward, thereby inserting into the port position of the U-shaped groove. At this time, the position between the baffle 972 arranged in front and the U-shaped component 971 is locked (the baffle 972 arranged in rear and the U-shaped component 971 are still hinged). By pushing the extended end of the electric push rod 96 backward, the pusher 97 in the locked state drives the pusher 97 to move backward. The guide rail frame 84 and the resistance slider 83 move backward. Under the supporting force of the electric push rod 96, the resistance component disengages from the ball groove, allowing the resistance slider 83 to move smoothly backward. The backward-moving resistance slider 83 drives the lower end of the steel rope 6 to pull backward, shortening the length of the exposed steel rope 6 between the upper end of the connecting shell 81 and the connecting head 5, thereby increasing the height of the left end of the modular steel cofferdam (the electric push rod 96 on the other side does not drive the push component 97 to move, the movable block 973 is in the initial position, the locking blocks 9751 on the front and rear sides do not descend, and the U-shaped component 971 is still hinged to the front and rear baffles 972, so it will not obstruct the smooth movement of the guide rail frame 84 driven by the electric push rod 96 on the right side).

[0060] The outer edge of the contact plate 94 is provided with a sliding block. The sliding block at the initial height is engaged with the slide rail, which is set on the connecting plate 12. The connecting plate 12 is installed on the lower side wall of the hoisting frame 7. When the contact plate 94 is not lowered, the angle of the contact plate 94 cannot change under the action of the sliding block and the slide rail, thereby positioning the angle of the gravity component 91. Due to the unequal width of the modular steel cofferdam, the angle of the steel rope 6 in the traction is unequal, resulting in the unequal angle of the hoisting frame 7. Before the contact plate 94 is lowered, the gravity component 91 cannot be guaranteed to be in a vertical state but is in a locked state, ensuring its stability during the adjustment process and preventing swaying. After the contact plate 94 is lowered, it indicates that the level needs to be adjusted. Then, the T-shaped frame 93 and the contact plate 94 are lowered as a whole by the connecting cylinder 92, thereby unlocking the angle adjustment of the contact plate 94.

[0061] Furthermore, the present invention also provides a construction method for a modular steel cofferdam, comprising the following steps:

[0062] S1. Assembly: The segmented steel cofferdam is assembled into a whole at the dock. After the assembly is completed, a steel wire mesh is laid at the bottom of the steel cofferdam, and a layer of non-woven fabric is laid on the steel wire mesh. Then, it is lifted onto the deck barge by a gantry crane and transported to the site to complete the initial positioning.

[0063] S2. Lifting and Leveling Adjustment: The bottom section of the steel cofferdam is lifted off the deck barge using the lifting equipment on the gantry. It is left to stand for 2-3 minutes. During this time, the balance of the bottom section of the steel cofferdam is adjusted by the traction component and the balance adjustment component. When the bottom section of the steel cofferdam is not level, the power supply is turned on to control the electric push rods to drive the corresponding pushers to adjust back and forth. The level of the bottom section of the steel cofferdam is adjusted by the raising and lowering of the steel cable through the traction component. After the leveling is adjusted, the lifting equipment is used to continue lifting it to a height that allows the deck barge to exit. After the deck barge exits, the lifting cable is slowly released, and the bottom section of the steel cofferdam is smoothly lowered into the water.

[0064] S3. Lifting: When the first set of steel cofferdams is lowered into the bottom of the channel, its top surface should be above the water surface. After the first set of steel cofferdams has sunk to a stable state, the lifting equipment is released. Then, the second set of steel cofferdams is lifted by a crane boat and positioned so that the upper and lower sections of the steel cofferdams are aligned. Then, the lifting cable is lowered so that the two sections contact each other and the position is locked. This process is repeated to lift the formed steel cofferdams and lower them to a stable position.

[0065] S4. Waterproofing tarpaulin laying: Unfold and lay the waterproofing tarpaulin flat on the top platform of the heightened steel cofferdam, and then put sandbags on the waterproofing tarpaulin to compact it with the riverbed.

[0066] S5. Drainage: After the waterproof cloth is laid, the water inside the steel cofferdam is pumped out using a drainage pump. During the drainage process, the stability and seepage of the cofferdam are closely monitored. If seepage is found, sandbags are placed at the corresponding seepage points to press down the bottom. If the cofferdam is found to be deformed, drainage is stopped immediately, the cause is analyzed, and reinforcement is carried out.

[0067] S6. Drying: After the water levels on both sides of the cofferdam are balanced, use a crane to lock the lifting ring at the float of the sandbag and lift the sandbags out to the bank one by one to dry. After all the sandbags are cleaned, the waterproof cloth floats to the surface. Use a crane to lock the lifting strap in the middle of the waterproof bag and lift the waterproof cloth out to the riverbank to dry.

[0068] S7. Bottom Sealing: The bottom of the steel cofferdam is sealed by pouring underwater concrete using the vertical tremie pipe method.

[0069] S8. Cleanup: Use boats to completely remove all construction debris from the river channel.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction device for a modular steel cofferdam, the modular steel cofferdam comprising a steel plate (1), a supporting truss (2), a snap-fit ​​frame (3), and a first snap-fit ​​component (4), characterized in that: The steel plates (1) are connected by a support truss (2), a snap-fit ​​bracket (3) is installed at the front end of the steel plate (1), the upper end of the snap-fit ​​bracket (3) is an open structure, and a first snap-fit ​​piece (4) is installed at the rear end of the steel plate (1). The construction process of modular steel cofferdam involves a construction device for modular steel cofferdam. This construction device is used to adjust the horizontal state of the steel cofferdam. The construction device includes a connector (5), a steel rope (6), a hoisting frame (7), a traction component (8), a balance adjustment component (9), a steel rope (10), and a connecting hook (11). The left end of the connector (5) is connected to the upper end of the steel rope (6). The lower end of the steel rope (6) passes through the traction component (8) and is connected to the hoisting frame (7) arranged on the left. The traction component (8) is installed on the outer wall of the hoisting frame (7) arranged on the left. The balance adjustment component (9) is symmetrically arranged at the front and rear ends inside the hoisting frame (7). The structure between the balance adjustment component (9) and the traction component (8) is matched. The right end of the connector (5) is connected to the hoisting frame (7) arranged on the right through the steel rope (10). The connecting hook (11) is symmetrically arranged at the front and rear ends of the hoisting frame (7). The balance adjustment assembly (9) includes a gravity component (91), a connecting cylinder (92), a T-shaped frame (93), a contact plate (94), a power supply unit (95), an electric push rod (96), and a pusher (97). The gravity component (91) is rotatably connected to the hoisting frame (7). A connecting cylinder (92) is provided in the middle of the gravity component (91). The extended end of the connecting cylinder (92) is connected to the T-shaped frame (93). The lower middle part of the T-shaped frame (93) is connected to the contact plate (94) by a pin shaft. The power supply unit (95) is symmetrically arranged at the left and right ends of the gravity component (91). The power supply unit (95) is electrically connected to the electric push rod (96) installed on the gravity component (91). A pusher (97) is installed on the output end of the electric push rod (96). The pusher (97) is snap-fitted to the traction assembly (8). The angle adjustment of the contact plate (94) controls the opening and closing of the circuit of the power supply unit (95). The traction assembly (8) includes a connecting shell (81), a reversing roller (82), a resistance slider (83), and a guide rail frame (84). The connecting shell (81) is installed on the outer wall of the hoisting frame (7) arranged on the left side. The reversing roller (82) is rotatably arranged inside the connecting shell (81). The lower end of the steel rope (6) passes through the connecting shell (81) and the reversing roller (82) in sequence and is connected to the resistance slider (83). The resistance slider (83) is slidably arranged in the guide rail groove opened in the hoisting frame (7). The lower end of the resistance slider (83) is connected to the arc-shaped guide rail frame (84).

2. The construction device for a modular steel cofferdam according to claim 1, characterized in that: The left and right ends of the resistance slider (83) are elastically connected with resistance components. The outer end of the resistance component is a spherical structure, and the outer end of the resistance component is temporarily engaged in the spherical groove opened in the side wall of the guide rail groove. The pusher (97) is snapped into the guide rail frame (84), and the cross section of the guide rail frame (84) is a T-shaped structure.

3. The construction device for a modular steel cofferdam according to claim 1, characterized in that: The power supply unit (95) includes a power supply (951), an insulating shell (952), a conductive block (953), a contact block (954), and an elastic telescopic rod (955). The gravity component (91) has symmetrical hidden slots at both ends. The side end of the T-shaped frame (93) is provided with an insulating shell (952). The power supply (951) in the hidden slot and the conductive block (953) in the insulating shell (952) are electrically connected to the electric push rod (96). The contact block (954) that cooperates with the conductive block (953) is installed at the lower end of the elastic telescopic rod (955). The upper end of the elastic telescopic rod (955) made of insulating material is connected to the insulating shell (952).

4. The construction device for a modular steel cofferdam according to claim 3, characterized in that: An insulating post is provided at the lower end of the contact block (954), and the contact block (954) is made of conductive material.

5. The construction device for a modular steel cofferdam according to claim 1, characterized in that: The pusher (97) includes a U-shaped part (971), a baffle (972), a movable block (973), a built-in spring (974), a second snap-fit ​​part (975), and a tensioning rope (976). The upper end of the U-shaped part (971) is connected to the outer wall of the baffle (972) via a hinge. The inner side of the baffle (972) is connected to the U-shaped part (971) via the tensioning rope (976). The movable block (973) is slidably disposed in the movable groove opened in the middle of the U-shaped part (971). The built-in spring (974) is connected between the movable block (973) and the movable groove. The second snap-fit ​​part (975) disposed at the lower end of the baffle (972) is connected to the movable block (973) via a connecting rope. The movable block (973) is connected to the extended end of the electric push rod (96).

6. The construction device for a modular steel cofferdam according to claim 5, characterized in that: The second snap-fit ​​component (975) includes a snap-fit ​​block (9751), a connecting spring (9752), a pressing block (9753), a pressure block (9754), and a working spring (9755). The snap-fit ​​block (9751) is slidably disposed in the built-in groove at the lower end of the baffle (972). The connecting spring (9752) is connected between the snap-fit ​​block (9751) and the built-in groove. A snap-fit ​​groove is provided on the inner side of the snap-fit ​​block (9751). The pressing block (9753) corresponding to the position of the snap-fit ​​groove is horizontally slidably disposed in the T-shaped groove at the baffle (972). The drag-reducing roller that contacts the inclined surface of the pressing block (9753) is rotatably disposed on the pressure block (9754). The working spring (9755) is connected between the upper end of the pressure block (9754) and the T-shaped groove.

7. The construction device for a modular steel cofferdam according to claim 6, characterized in that: A connecting rope is connected between the snap-fit ​​block (9751) and the movable block (973). The connecting rope is located in the U-shaped groove opened in the U-shaped part (971), and the port position of the U-shaped groove corresponds to the position of the built-in groove.

8. The construction device for a modular steel cofferdam according to claim 1, characterized in that: The outer edge of the contact plate (94) is provided with a sliding block. The sliding block of the initial height is engaged with the slide rail. The slide rail is set on the connecting plate (12). The connecting plate (12) is installed on the lower side wall of the hoisting frame (7).

9. A construction method for a modular steel cofferdam, comprising the following steps, using the construction device for a modular steel cofferdam as described in any one of claims 1-8: S1. Assembly: The segmented steel cofferdam is assembled into a whole at the dock. After the assembly is completed, a steel wire mesh is laid at the bottom of the steel cofferdam, and a layer of non-woven fabric is laid on the steel wire mesh. Then, it is lifted onto the deck barge by a gantry crane and transported to the site to complete the initial positioning. S2. Lifting and Leveling Adjustment: The bottom section of the steel cofferdam is lifted off the deck barge using the lifting equipment on the gantry. It is left to stand for 2-3 minutes. During this time, the balance of the bottom section of the steel cofferdam is adjusted by the traction component and the balance adjustment component. When the bottom section of the steel cofferdam is not level, the power supply is turned on to control the electric push rods to drive the corresponding pushers to adjust back and forth. The level of the bottom section of the steel cofferdam is adjusted by the raising and lowering of the steel cable through the traction component. After the leveling is adjusted, the lifting equipment continues to lift it to a height that allows the deck barge to exit. After the deck barge exits, the lifting cable is slowly released, and the bottom section of the steel cofferdam is smoothly lowered into the water. S3. Lifting: When the first set of steel cofferdams is lowered into the bottom of the channel, its top surface should be above the water surface. After the first set of steel cofferdams has sunk to a stable state, the lifting equipment is released. Then, the second set of steel cofferdams is lifted by a crane and positioned so that the upper and lower sections of the steel cofferdams are aligned. Then, the lifting cable is lowered so that the two sections contact each other and the position is locked. This process is repeated to lift the formed steel cofferdams and lower them to a stable position. S4. Waterproofing tarpaulin laying: Unfold the waterproofing tarpaulin and lay it flat on the top platform of the heightened steel cofferdam. Then, put sandbags on the waterproofing tarpaulin to compact it with the riverbed. S5. Drainage: After the waterproof cloth is laid, the water inside the steel cofferdam is pumped out using a drainage pump. During the drainage process, the stability and seepage of the cofferdam are closely monitored. If seepage is found, sandbags are placed at the bottom of the corresponding seepage point. If the cofferdam is found to be deformed, drainage is stopped immediately, the cause is analyzed, and reinforcement is carried out. S6. Drying: After the water levels on both sides of the cofferdam are balanced, use a crane to lock the lifting ring at the floating point of the sandbag and lift the sandbags out to the shore to dry. After all the sandbags are cleaned, the waterproof cloth will float to the surface. Use a crane to lock the lifting strap in the middle of the waterproof cloth and lift the waterproof cloth out to the riverbank to dry. S7. Bottom Sealing: The bottom of the steel cofferdam is sealed by pouring underwater concrete using the vertical tremie pipe method. S8. Cleanup: Use boats to completely remove all construction debris from the river channel.

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