A quick-assembly suspended box cofferdam without bottom sealing and installation method

Abstract

The application discloses a kind of free bottom sealing quick assembly hoisting box cofferdams and installation methods, belong to hoisting cofferdam technical field, including hoisting system, formwork system and weir bottom overturning system, hoisting system is located in the four around of formwork system, formwork system is located in weir bottom overturning system top side, hoisting system includes the positioning support system welded in the four around of formwork system, the bottom of positioning support system two sides is provided with load-bearing support system, formwork system includes two groups of integral wallboard and side panel connected in sequence, two groups of integral wallboard bottom side are rotatably connected with overturning bottom plate through folding, overturning bottom plate is located in weir bottom overturning system top side, weir bottom overturning system includes the bottom mould fixed support welded in the bottom of overturning bottom plate, bottom mould fixed support bottom side is provided with overturning structure through longitudinal beam, the hoisting box cofferdams of the application disclosed in this application are economical, effectively shorten construction period, reduce potential safety hazard and convenient to disassemble and assemble.

Description

Technical Field

[0001] This invention relates to the field of hoisting cofferdam technology, and in particular to a bottomless, rapid-assembly hoisting cofferdam and its installation method. Background Technology

[0002] There are several methods for constructing inter-column tie beams underwater: using caisson cofferdams or underwater steel cofferdams to ensure a waterless operating environment. Among these, the common method for constructing caisson cofferdams involves pouring underwater concrete to seal the bottom. The concrete for sealing the bottom and the bottom formwork of the caisson are invested in one go, resulting in high costs and a long construction period. The method for constructing underwater steel cofferdams can be carried out by driving steel sheet piles and lowering single-wall or double-wall steel cofferdams. However, this method has high requirements for riverbed geology, limited adaptability, a long construction period, and high costs.

[0003] As mentioned above, the existing underwater construction process for inter-column tie beams is complex, cumbersome, and costly. Therefore, considering the project characteristics, especially the tie beams which are not deep and are relatively small in size, it is urgent to design a simple, economical, and reusable underwater caisson cofferdam. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to propose a cofferdam that is economical, saves money, effectively shortens the construction period, reduces safety hazards, and is easy to assemble and disassemble.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The present invention provides a bottomless, quick-assembly, suspended cofferdam, comprising a hoisting system, a template system, and a cofferdam bottom tilting system. The hoisting system is located around the template system, and the template system is located on the top side of the cofferdam bottom tilting system.

[0007] The suspension system includes a positioning support system welded around the template system, and load-bearing support systems are provided on both sides of the bottom of the positioning support system;

[0008] The template system includes two sets of integral wall panels and side panels connected sequentially to each other. The bottom sides of the two sets of integral wall panels are connected to a flip-bottom plate by hinges. The flip-bottom plate is located on the top side of the weir bottom flip-bottom system.

[0009] The weir bottom overturning system includes a bottom formwork fixing support welded to the bottom side of the overturning bottom plate, and the bottom side of the bottom formwork fixing support is provided with an overturning structure through longitudinal beams.

[0010] A preferred embodiment of the present invention is that the positioning support system includes connecting vertical beams disposed on opposite sides of two sets of integral wall panels. A double-channel steel positioning beam is disposed on the top side of the connecting vertical beams of the same two sets. A connecting screw is disposed between the double-channel steel positioning beam and the connecting vertical beam. Connecting nuts are screwed to both ends of the connecting screw to fix the connection between the double-channel steel positioning beam and the connecting vertical beam. A tension / compression member is disposed between the connecting vertical beams on opposite sides of the two sets of integral wall panels, and the tension / compression member is located above the two sets of integral wall panels.

[0011] A preferred embodiment of the present invention is that the tension / compression member includes a connecting pressure rod connecting two sets of connecting vertical beams, and threaded steel tie rods are provided at both ends of the connecting pressure rod. The threaded steel tie rods pass through the connecting vertical beams and are fixed by tie rod nuts.

[0012] A preferred embodiment of the present invention is that the load-bearing support system includes upper load-bearing beams disposed on both sides of the bottom of two sets of double-channel steel positioning beams, and lower load-bearing beams disposed on both sides of the bottom of the longitudinal beams. The upper and lower load-bearing beams are connected at both ends by hangers and locked in place by connecting nuts.

[0013] A preferred embodiment of the present invention is that the outer walls of the integral wall panel and the side panel are provided with a number of sets of back ribs at equal intervals, and the back ribs are fixed to the connecting vertical beams by welding.

[0014] The two sets of flip-top plates are close to each other on one side as the opening and closing end, and semi-circular protective grooves are symmetrically arranged on both sides of the two sets of opening and closing ends.

[0015] A preferred embodiment of the present invention is that the bottom formwork fixing support includes a support frame welded from several sets of support beams. Two sets of support frames are provided and are correspondingly arranged on the top side of the longitudinal beam. Two sets of annular support beams are symmetrically arranged on one side of the two sets of support frames, and the two ends of the flipping bottom plate are flush with the two ends of the support frame.

[0016] A preferred embodiment of the present invention is that the flipping structure includes several sets of brackets welded to the bottom sides of two sets of longitudinal beams, a rotating rod is provided between the several sets of brackets, a meshing gear is provided on the outer wall of the rotating rod, the meshing gears on both sides are meshed with each other, the brackets and the meshing gears are staggered, a rotating rod is provided at both ends of the rotating rod, and a fixing plate is installed on the top side of the two sets of rotating rods near the longitudinal beams.

[0017] A preferred embodiment of the present invention is that rubber waterstop strips are provided on the inner walls of the two sets of support frames and the annular support beams that are close to each other, and water-swellable waterstop strips are provided on the other three sides of the support frames.

[0018] A method for installing a bottomless, rapid-assembly cofferdam includes the following steps:

[0019] Step 1: After the construction platform is erected, the upper load-bearing beam is erected on the construction platform. After adjusting the plane position of the upper load-bearing beam, the two ends of the upper load-bearing beam are bolted to the construction platform.

[0020] Step 2: Weld the overall wall panel and side panel in sequence. Weld several sets of back ribs to the outer side of the overall wall panel and side panel in sequence. Weld several sets of hinges to one side of the flip-top plate. Use hoisting equipment to attach the flip-top plate to the bottom side of the overall wall panel. Weld the other end of the hinges to the overall wall panel to complete the installation of the template system.

[0021] Step 3: Weld the connecting vertical beams to the back ribs on one side of the integral wall panel, with two sets welded on one side. Weld the double-channel steel positioning beams to the top side of the connecting vertical beams and erect them on the upper load-bearing beam. Install the connecting pressure rods between the two sets of connecting vertical beams. After passing the threaded steel tie rods through the connecting vertical beams and connecting pressure rods, fix them with tie rod nuts to create horizontal tension and pressure between the two connecting vertical beams to form a self-locking mechanism, thus completing the installation of the positioning support system.

[0022] Step 4: Weld and fix the support frame and the corresponding flipped bottom plate of the ring support beam. Weld the longitudinal beam to both sides of the bottom of the support frame. Weld multiple brackets in sequence at the position of the longitudinal beam according to the design. After the rotating rod passes through the hole of the bracket, weld multiple meshing gears to the rotating rod. Weld the rotating rod to both ends of the rotating rod to complete the installation of the weir bottom flipping system.

[0023] Step 5: Hoist the installed template system, weir bottom tilting system, and positioning support system onto the upper load-bearing beam. After passing the connecting bolts through the double-channel steel positioning beam and the upper load-bearing beam, fix them with connecting nuts to secure the double-channel steel positioning beam and the upper load-bearing beam together, effectively transferring force. Lower the lower load-bearing beam support under the longitudinal beam, adjust the elevation of the cofferdam, install the lifting rods to connect the upper load-bearing beam and the lower load-bearing beam, and fix them with connecting nuts.

[0024] Step 6: Fit the two sets of fixing plates onto the two sets of rotating rods on both sides respectively, so that the meshing gears on both sides are kept in a meshing state and do not rotate, so as to ensure that the flipping base plate is in a closed state.

[0025] A preferred embodiment of the present invention is that, in step 4, a rubber waterstop strip is inserted on one side where the support frame connects to the annular support beam, and water-swellable waterstop strips are inserted on the other three sides.

[0026] The beneficial effects of this invention are as follows:

[0027] During the construction of the platform in the water, the additional gravity and buoyancy at different stages of the cofferdam construction should be calculated in advance to ensure that the platform in the water can support the additional load of the cofferdam.

[0028] The caisson cofferdam is integrally welded, lightweight, and can be hoisted as a whole, reducing workload; the caisson cofferdam uses a steel bottom formwork instead of concrete sealing, which can be reused, saving construction costs;

[0029] The dismantling of the bottom formwork of the cofferdam is carried out by gear meshing through rod transmission. The vertical rotating rod extends out of the water surface, avoiding underwater construction by personnel. This reduces the skill requirements for personnel and minimizes safety hazards.

[0030] Rubber waterstops and water-swellable waterstops are pre-installed between the components of the cofferdam to ensure water-stopping effect while avoiding underwater plugging operations.

[0031] The load-bearing support of the suspension system uses hangers, which are easy to install and dismantle and can adapt to different construction stages of the cofferdam. The tension and compression members of the suspension system include ring compression members and threaded steel tie rods. The ring compression members provide inward lateral pressure support for the wall panels, and the threaded steel tie rods provide outward lateral pressure support for the wall panels. They can be dismantled at certain stages to facilitate the construction of tie beams. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the cofferdam installation structure provided in a specific embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the hoisting system structure provided in a specific embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the template system structure provided in a specific embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the weir bottom overturning system provided in a specific embodiment of the present invention.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 10. Hanging system; 101. Positioning support system; 111. Double-channel steel positioning beam; 112. Connecting nut; 113. Connecting bolt; 114. Connecting vertical beam; 115. Threaded steel tie rod; 116. Tie rod nut; 117. Connecting pressure rod; 102. Load-bearing support system; 121. Upper load-bearing beam; 122. Lower load-bearing beam; 123. Hanging rod; 20. Formwork system; 201. Integral wall panel; 202. Tilting bottom plate; 203. Side panel; 204. Folding; 205. Back rib; 206. Semi-circular protective groove; 30. Weir bottom tilting system; 301. Bottom formwork fixing support; 331. Support frame; 332. Ring support beam; 302. Tilting structure; 311. Rotating rod; 312. Rotating rod; 313. Fixing plate; 314. Meshing gear; 315. Bracket; 321. Longitudinal beam. Detailed Implementation

[0038] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] A bottomless, quick-assembly caisson cofferdam includes a hanging system 10, a template system 20, and a cofferdam bottom tilting system 30. The hanging system 10 is located around the template system 20, and the template system 20 is located on the top side of the cofferdam bottom tilting system 30.

[0040] The hanging system 10 includes a positioning support system 101 welded around the template system 20. The positioning support system 101 has load-bearing support systems 102 on both sides of its bottom. The load-bearing support system 102 includes two sets of upper load-bearing beams 121 and lower load-bearing beams 122 on both sides of the bottom of the longitudinal beam 321. The upper load-bearing beams 121 and lower load-bearing beams 122 are connected at both ends by hangers 123 and locked and fixed by connecting nuts 112.

[0041] The template system 20 includes two sets of integral wall panels 201 and side panels 203 connected in sequence. The bottom sides of the two sets of integral wall panels 201 are rotatably connected to a flipping bottom plate 202 via a hinge 204. The flipping bottom plate 202 is located on the top side of the weir bottom flipping system 30.

[0042] The weir bottom overturning system 30 includes a bottom formwork fixing support 301 welded to the bottom side of the overturning bottom plate 202, and the bottom formwork fixing support 301 has an overturning structure 302 provided on the bottom side through a longitudinal beam 321.

[0043] The flipping structure 302 includes several sets of brackets 315 welded to the bottom sides of two sets of longitudinal beams 321. A rotating rod 312 is arranged between the several sets of brackets 315. The outer wall of the rotating rod 312 is provided with a meshing gear 314. The meshing gears 314 on both sides are meshed with each other. The brackets 315 and the meshing gears 314 are staggered. Rotating rods 311 are provided at both ends of the rotating rod 312. A fixing plate 313 is installed on the top side of the two sets of rotating rods 311 near the longitudinal beams 321.

[0044] After the construction platform is erected, the load-bearing support system 102 is first installed on the platform. The assembled formwork system 20 is welded to the top side of the longitudinal beam 321, and the positioning support system 101 of the hanging system 10 is welded to both sides of the integral wall panel 201. At the same time, the load-bearing support system 102 supports the weir bottom tilting system 30, and the tilting structure 302 is welded to the bottom side of the longitudinal beam 321 through the bracket 315 to facilitate the assembly and disassembly of the tilting bottom plate 202. The joints of the entire structure are prevented from seeping through rubber waterstops and water-swellable waterstops. The assembled weir bottom tilting system 30, formwork system 20, and positioning support system 101 of the hanging system 10 are then hoisted upright. The entire assembly is suspended on the upper load-bearing beam 121, fixing the positioning support system 101 and the upper load-bearing beam 121 together for effective force transmission. During use, the two sets of rotating rods 311 on one side drive the rotating rods 312 to rotate, thereby causing the rotating rods 312 on both sides to drive the meshing gears 314 on both sides to rotate and engage. The fixing plate 313 is fitted between the two sets of rotating rods 311, keeping the meshing gears 314 engaged. Simultaneously, the rotation of the rotating rods 312 causes the bracket 315 and longitudinal beam 321 to cause the tilting bottom plate 202 to tilt upwards under the action of the hinge 204, thus closing the tilting bottom plate 202 and ensuring a dry working environment during pumping. The cofferdam is isolated using a flip-top plate 202. After construction, the lower load-bearing beam 122 is removed, and the fixing plate 313 is taken off. The rotating rod 311 drives the rotating rod 312 to rotate, causing the meshing gear 314 to change from an engaged state to a disengaged state. This causes the longitudinal beam 321 to drive the flip-top plates 202 on both sides to flip under the action of the hinge 204, thus freeing the bottom of the entire cofferdam. The entire cofferdam is then lifted using lifting equipment and transferred to the next cap beam construction platform for reuse. The cofferdam is installed using integral welding, and the integral lifting process facilitates rapid assembly and disassembly, reducing workload and shortening the work cycle. The cofferdam uses a steel bottom formwork instead of concrete for sealing the bottom. The process is reusable and cost-effective; the removal of the bottom formwork of the cofferdam is achieved through the transmission of meshing gears 314 via rotating rods 311 and 312, with the rotating rods 311 extending above the water surface, avoiding underwater construction and reducing the skill requirements for personnel, thus minimizing safety hazards and effectively improving construction safety; rubber waterstops and water-swellable waterstops are pre-installed between the cofferdam components to ensure water-stopping effect while avoiding underwater plugging operations; the positioning support system 101 in the hanging system 10 is welded to the integral wall panel 201 of the formwork system 20 to provide buoyancy support after the cofferdam is pumped out, avoiding the need for counterweighting to resist buoyancy.

[0045] As a possible implementation of this solution, preferably, the positioning support system 101 includes connecting vertical beams 114 disposed on the opposite sides of the two sets of integral wall panels 201. Double-channel steel positioning beams 111 are disposed on the top side of the connecting vertical beams 114 of the same two sets. Connecting screws 113 are disposed between the double-channel steel positioning beams 111 and the connecting vertical beams 114. Connecting nuts 112 are screwed to both ends of the connecting screws 113 to fix the connection between the double-channel steel positioning beams 111 and the connecting vertical beams 114. Tension-compression members are disposed between the connecting vertical beams 114 located on the opposite sides of the two sets of integral wall panels 201. The tension-compression members are located above the two sets of integral wall panels 201.

[0046] The connecting vertical beam 114 is made of channel steel, and the connecting screw 113 is made of precision rolled threaded steel. The connecting screw 113 is connected to the load-bearing support system 102 to transmit the gravity and buoyancy at different stages to the load-bearing support system 102. The connecting vertical beam 114 transmits the gravity and buoyancy of the template system 20 to the double-channel steel positioning beam 111.

[0047] As a possible implementation of this solution, preferably, the tension / compression member includes a connecting pressure rod 117 that connects two sets of connecting vertical beams 114. The connecting pressure rod 117 has threaded steel tie rods 115 at both ends. The threaded steel tie rods 115 pass through the connecting vertical beams 114 and are fixed by tie rod nuts 116.

[0048] The gravity and buoyancy of the template system 20 are transmitted to the double-channel steel positioning beam 111 through the connecting vertical beam 114; the adjacent connecting vertical beams 114 are laterally stabilized by threaded steel tie rods 115 and connecting pressure rods 117 combined with tie rod nuts 116 to resist the lateral pressure transmitted by part of the side panel 203.

[0049] As a possible implementation of this solution, preferably, the outer walls of the integral wall panel 201 and the side panel 203 are provided with several sets of back ribs 205 at equal intervals, and the back ribs 205 are fixed to the connecting vertical beam 114 by welding.

[0050] The two sets of flip-top plates 202 are close to each other on one side as the opening and closing ends. The two sets of opening and closing ends are symmetrically provided with semi-circular guard grooves 206. A 2 cm gap is reserved between the two sets of semi-circular guard grooves 206 to facilitate the flip-top plates 202 to be flipped.

[0051] The back rib 205 is made of channel steel. The back rib 205 is welded and fixed to the connecting vertical beam 114 and the side panel 203 respectively, so as to transmit the force to the double channel steel positioning beam 111.

[0052] As a possible implementation of this solution, preferably, the bottom formwork fixing support 301 includes a support frame 331 welded from several sets of support beams. Two sets of support frames 331 are provided and are correspondingly provided on the top side of the longitudinal beam 321. Two sets of annular support beams 332 are symmetrically provided on one side of the two sets of support frames 331. The two ends of the flipping bottom plate 202 are flush with the two ends of the support frame 331.

[0053] The two sets of support frames 331 and the annular support beam 332 are provided with rubber waterstop strips on one inner wall close to each other, and the other three sides of the support frame 331 are provided with water-swellable waterstop strips.

[0054] The bottom formwork fixing support 301 is made of channel steel, which allows the longitudinal beam 321 to drive the two sets of support frames 331 to rotate under the action of the bracket 315. Since the support frame 331 is welded to the rotating bottom plate 202, it drives the rotating bottom plate 202 to open or close, replacing the concrete sealing process. It can be reused repeatedly, saving costs. The rubber waterstop strip is filled in, which can not only achieve the water-stopping effect, but also can be well clamped to the steel casing of the pile foundation. The water-swellable waterstop strip is filled in to achieve the water-stopping effect.

[0055] A method for installing a bottomless, rapid-assembly cofferdam includes the following steps:

[0056] Step 1: After the construction platform is erected, the upper load-bearing beam 121 is erected on the construction platform. After adjusting the plane position of the upper load-bearing beam 121, the two ends of the upper load-bearing beam 121 are bolted to the construction platform.

[0057] Step 2: Weld the integral wall panel 201 and the side panel 203 in sequence. Weld several sets of back ribs 205 in sequence on the outer side wall of the integral wall panel 201 and the side panel 203. Weld several sets of hinges 204 on one side of the flip-top plate 202. Use hoisting equipment to attach the flip-top plate 202 to the bottom side of the integral wall panel 201. Weld the other end of the hinge 204 to the integral wall panel 201 to complete the installation of the template system 20.

[0058] Step 3: Weld the connecting vertical beam 114 to the back rib 205 on one side of the integral wall panel 201, and weld two sets on one side. Weld the double-channel steel positioning beam 111 to the top side of the connecting vertical beam 114 and erect it on the upper load-bearing beam 121. Install the connecting pressure rod 117 between the two sets of connecting vertical beams 114. After passing the threaded steel tie rod 115 through the connecting vertical beam 114 and the connecting pressure rod 117, fix it with the tie rod nut 116 so that horizontal tension and pressure are generated between the two connecting vertical beams 114 to form a self-locking mechanism, and complete the installation of the positioning support system 101.

[0059] Step 4: Weld and fix the support frame 331 and the annular support beam 332 to the corresponding flipped bottom plate 202. Weld the longitudinal beam 321 to both sides of the bottom of the support frame 331. Weld multiple brackets 315 in sequence at the position of the longitudinal beam 321 according to the design. After the rotating rod 312 passes through the hole of the bracket 315, weld multiple meshing gears 314 to the rotating rod 312. Weld the rotating rod 311 to both ends of the rotating rod 312 to complete the installation of the weir bottom flipping system 30.

[0060] Step 5: Hoist the installed template system 20, weir bottom tilting system 30, and positioning support system 101 onto the upper load-bearing beam 121. Pass the connecting bolt 113 through the double-channel steel positioning beam 111 and the upper load-bearing beam 121 and fix it with the connecting nut 112 to fix the double-channel steel positioning beam 111 and the upper load-bearing beam 121 together, effectively transmitting force. Lower the lower load-bearing beam 122 and support it under the longitudinal beam 321. Adjust the elevation of the cofferdam, install the lifting rod 123 to connect the upper load-bearing beam 121 and the lower load-bearing beam 122, and fix it with the connecting nut 112.

[0061] Step 6: Fit the two sets of fixing plates 313 onto the two sets of rotating rods 311 on both sides respectively, so that the meshing gears 314 on both sides remain engaged and do not rotate, so as to ensure that the flipping base plate 202 is in the closed state.

[0062] To ensure the structural dimensions and water-stopping effect of the cofferdam, all components were factory-processed and trial-assembled before being transported to the site for final assembly. After the hanging system 10, template system 20, and weir bottom tilting system 30 were installed in their respective positions, the rotating rod 311 was used to drive the rotating rod 312 to engage the meshing gears 314. The fixing plate 313 was used to keep the two sets of meshing gears 314 in a meshed state, preventing rotation and ensuring that the tilting bottom plate 202 was in a closed state. Water was pumped out of the weir to create a dry working environment, and the template system 20 of the cofferdam was treated with an isolation layer. To prevent concrete adhesion, the side formwork of the cap beam is installed on the formwork system 20 of the cofferdam. After the cap beam reinforcement is tied, concrete is poured. After the cap beam reaches the required strength, the side formwork of the cap beam is removed, and water is injected into the cofferdam. After the water levels inside and outside are level, the lower load-bearing beam 122 is removed, the fixing plate 313 on the rotating rod 311 is taken off, and the rotating rod 312 is pulled to make the meshing gear 314 rotate, thereby driving the flipping bottom plate 202 to flip, so that the bottom of the entire cofferdam is detached. The entire cofferdam is then lifted by lifting equipment and transferred to the next cap beam construction platform for reuse.

[0063] As a possible implementation of this solution, preferably, in step 4, a rubber waterstop strip is inserted on the side where the support frame 331 connects to the annular support beam 332, and water-swellable waterstop strips are inserted on the other three sides, so as to achieve the water-stopping effect and at the same time be well clamped to the steel casing of the pile foundation.

[0064] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A bottomless, quick-assembly, suspended cofferdam, characterized in that: It includes a hanging system (10), a template system (20) and a weir bottom overturning system (30), wherein the hanging system (10) is located around the template system (20) and the template system (20) is located on the top side of the weir bottom overturning system (30); The hanging system (10) includes a positioning support system (101) welded around the template system (20), and load-bearing support systems (102) are provided on both sides of the bottom of the positioning support system (101). The template system (20) includes two sets of integral wall panels (201) and side panels (203) connected in sequence. The bottom sides of the two sets of integral wall panels (201) are rotatably connected to a flip-bottom plate (202) via hinges (204). The flip-bottom plate (202) is located on the top side of the weir bottom flip system (30). The weir bottom overturning system (30) includes a bottom formwork fixing support (301) welded to the bottom side of the overturning bottom plate (202), and the bottom formwork fixing support (301) is provided with an overturning structure (302) through a longitudinal beam (321).

2. The bottomless, rapid-assembly, caisson cofferdam according to claim 1, characterized in that: The positioning support system (101) includes connecting vertical beams (114) disposed on the opposite side of the two sets of integral wall panels (201). Each of the two sets of connecting vertical beams (114) on each side is provided with a double-channel steel positioning beam (111). A connecting screw (113) is provided between the double-channel steel positioning beam (111) and the connecting vertical beam (114). The two ends of the connecting screw (113) are screwed with connecting nuts (112) to fix the connection between the double-channel steel positioning beam (111) and the connecting vertical beam (114). A tension and compression member is provided between the connecting vertical beams (114) on the opposite side of the two sets of integral wall panels (201). The tension and compression member is located above the two sets of integral wall panels (201).

3. The bottomless, rapid-assembly, caisson cofferdam according to claim 2, characterized in that: The tension and compression member includes a connecting compression rod (117) that connects two sets of connecting vertical beams (114). The connecting compression rod (117) has threaded steel tie rods (115) at both ends. The threaded steel tie rods (115) pass through the connecting vertical beams (114) and are fixed by tie rod nuts (116).

4. The bottomless, rapid-assembly, caisson cofferdam according to claim 3, characterized in that: The load-bearing support system (102) includes an upper load-bearing beam (121) set on both sides of the bottom of two sets of double-channel steel positioning beams (111) and a lower load-bearing beam (122) set on both sides of the bottom of the longitudinal beam (321). The upper load-bearing beam (121) and the lower load-bearing beam (122) are connected at both ends by a hanger (123) and locked and fixed by a connecting nut (112).

5. The bottomless, rapid-assembly, caisson cofferdam according to claim 4, characterized in that: The outer walls of the integral wall panel (201) and the side panel (203) are provided with several sets of back ribs (205) at equal intervals, and the back ribs (205) are fixed to the connecting vertical beam (114) by welding; The two sets of flip-top plates (202) are close to each other on one side as the opening and closing end, and semi-circular protective grooves (206) are symmetrically arranged on both sides of the two sets of opening and closing ends.

6. The bottomless, rapid-assembly, caisson cofferdam according to claim 5, characterized in that: The bottom formwork fixing support (301) includes a support frame (331) welded from several sets of support beams. There are two sets of support frames (331), which are correspondingly set on the top side of the longitudinal beam (321). Two sets of annular support beams (332) are symmetrically arranged on one side of the two sets of support frames (331). The two ends of the flipping bottom plate (202) are flush with the two ends of the support frame (331).

7. A bottomless, rapid-assembly, caisson-lifting cofferdam according to claim 6, characterized in that: The flipping structure (302) includes several sets of brackets (315) welded to the bottom side of two sets of longitudinal beams (321). A rotating rod (312) is arranged between the several sets of brackets (315). A meshing gear (314) is provided on the outer wall of the rotating rod (312). The meshing gears (314) on both sides are meshed with each other. The brackets (315) and the meshing gears (314) are staggered. Rotating rods (311) are provided at both ends of the rotating rod (312). A fixing plate (313) is installed on the top side of the two sets of rotating rods (311) near the longitudinal beam (321).

8. A bottomless, rapid-assembly, caisson-lifting cofferdam according to claim 7, characterized in that: The two sets of support frames (331) and the annular support beam (332) are provided with rubber waterstop strips on one side of their inner walls, and the other three sides of the support frame (331) are provided with water-swellable waterstop strips.

9. The installation method of a bottomless, rapid-assembly, suspended cofferdam according to claim 8, characterized in that: Includes the following steps: Step 1: After the construction platform is erected, the upper load-bearing beam (121) is erected on the construction platform. After adjusting the plane position of the upper load-bearing beam (121), the two ends of the upper load-bearing beam (121) are bolted to the construction platform. Step 2: Weld the integral wall panel (201) and the side panel (203) in sequence. Weld several sets of back ribs (205) in sequence on the outer side wall of the integral wall panel (201) and the side panel (203). Weld several sets of hinges (204) on one side of the flip-top plate (202). Use hoisting equipment to attach the flip-top plate (202) to the bottom side of the integral wall panel (201). Weld the other end of the hinge (204) to the integral wall panel (201) to complete the installation of the template system (20). Step 3: Weld the connecting vertical beam (114) to the back rib (205) on one side of the integral wall panel (201), and weld two sets on one side. Weld the double-channel steel positioning beam (111) to the top side of the connecting vertical beam (114) and erect it on the upper load-bearing beam (121). Install the connecting pressure rod (117) between the two sets of connecting vertical beams (114). After passing the threaded steel tie rod (115) through the connecting vertical beam (114) and the connecting pressure rod (117), fix it with the tie rod nut (116) so that the two connecting vertical beams (114) generate horizontal tension and pressure to form self-locking, and complete the installation of the positioning support system (101). Step 4: Weld and fix the support frame (331) and the ring support beam (332) to the corresponding flipped bottom plate (202). Weld the longitudinal beam (321) to both sides of the bottom of the support frame (331). Weld multiple brackets (315) in sequence at the position of the longitudinal beam (321) according to the design. After the rotating rod (312) passes through the hole of the bracket (315), weld multiple meshing gears (314) to the rotating rod (312) accordingly. Weld the rotating rod (311) to both ends of the rotating rod (312) to complete the installation of the weir bottom flipping system (30). Step 5: Hoist the installed template system (20), weir bottom overturning system (30) and positioning support system (101) onto the upper load-bearing beam (121). After passing the connecting bolt (113) through the double-channel steel positioning beam (111) and the upper load-bearing beam (121), fix it with the connecting nut (112) to fix the double-channel steel positioning beam (111) and the upper load-bearing beam (121) together, so as to effectively transmit force. Lower the lower load-bearing beam (122) under the longitudinal beam (321), adjust the elevation of the cofferdam, install the hoisting rod (123) to connect the upper load-bearing beam (121) and the lower load-bearing beam (122), and fix it with the connecting nut (112). Step 6: Fit the two sets of fixing plates (313) onto the two sets of rotating rods (311) on both sides respectively, so that the meshing gears (314) on both sides remain engaged and do not rotate, so as to ensure that the flipping base plate (202) is in a closed state.

10. The installation method of a bottomless, rapid-assembly, suspended cofferdam according to claim 9, characterized in that: In step 4, a rubber waterstop strip is inserted on the side where the support frame (331) connects to the annular support beam (332), and water-swellable waterstop strips are inserted on the other three sides.

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