Expandable water retaining cofferdam and construction method

Abstract

The invention provides a deployable water retaining cofferdam and a construction method. The deployable water retaining cofferdam comprises a transverse supporting structure in the water flow direction, a telescopic supporting structure perpendicular to the water flow direction, a flexible waterproof covering layer, a water stopping groove, an insertion type water stopping structure and a water sinking tank. According to the condition that the channel slope is actually uneven, the cofferdam can be completely attached to the channel slope through the foldable supporting structure perpendicular to the channel slope direction and the water filling type flexible water stop structure, and the risk of water leakage in the construction process is reduced. The cofferdam is composed of a metal structure frame and a flexible waterproof material covering the metal structure frame, and the overall weight of the cofferdam is greatly reduced. The whole cofferdam is symmetrically arranged, the structure is formed by splicing, and all facilities are easy to mount and dismount. The deployable water retaining cofferdam can adapt to the flowing water condition of a channel and meet the construction requirements of positioning, drainage, stability and the like.

Description

Technical Field

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

[0002] With the continuous development of science and technology, water conservancy projects are moving towards a safer and more efficient way. At present, the water diversion projects built at home and abroad mainly use open channels to convey water, supplemented by tunnels in some places, while there are few water diversion projects with deep tunnels as the main body. The concrete lining of the inner slope of the open channel water diversion channel will directly affect the loss rate and engineering safety during the water diversion process. Taking the South-to-North Water Diversion Project as an example, the middle line project mainly conveys water in the open channel. The engineering lining plate along the channel slope is relatively thin, and there is also an insulation plate with large deformation underneath. During the construction and operation period, due to the influence of construction quality, water erosion, temperature stress, etc., the channel lining plate may have various engineering problems such as concrete damage, cracks, bulge deformation, etc. However, the main canal of the middle line of the South-to-North Water Diversion Project does not have the conditions for water suspension and maintenance, so it is necessary to achieve underwater repair of the lining without water suspension.

[0003] At present, there are two main solutions for underwater repair of open channel linings. One is to use underwater non-dispersible concrete, polymer concrete or self-compacting concrete, which has high fluidity, high stability and high durability, and directly pour it into the damaged area on the shore to repair the damaged concrete slab underwater. However, there are problems such as low efficiency of material repair in a dynamic water environment, and even water pollution, which may affect the water quality safety of the South-to-North Water Diversion Project.

[0004] The second is to create a dry land construction environment by building cofferdams and realize large-scale lining structure repair. By building cofferdams, dry land construction can be created when the channel has a large flow of water, ensuring construction safety and preventing damage to water quality during the construction process as much as possible. However, most of the existing cofferdam structures are welded or spliced ​​with large side panels, which are difficult to adapt to the undulating channel slopes. When the slope area to be repaired is large, the weight of the entire cofferdam structure is too large, and the on-site processing error is large and the precision is low, which is prone to leakage, affecting the construction quality.

[0005] Therefore, how to improve the construction quality of lining structure repair projects has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0006] Based on the above problems, the present application provides an expandable water retaining cofferdam and a construction method to improve the construction quality of lining structure repair projects.

[0007] The present application provides a deployable water retaining cofferdam, the deployable water retaining cofferdam comprising:

[0008] A lateral support structure along the water flow direction, a retractable support structure perpendicular to the water flow direction, a flexible waterproof covering layer, a water stop groove, an inserted water stop structure and a submerged tank;

[0009] The transverse support structure includes a plurality of double-layer truss structures, adjacent double-layer truss structures are connected by a first bolt connection plate, and the plurality of double-layer truss structures are connected to the telescopic support structure by the first bolt connection plate, and the telescopic support structure is used to provide vertical support for the cofferdam;

[0010] The outer side of the retractable support structure is connected to the water stop groove, the water stop groove includes a first water stop groove and a second water stop groove, the first water stop groove and the second water stop groove both include an articulated joint and a channel-like steel, the side of the channel-like steel includes a channel-like steel hole, the first water stop groove and the second water stop groove are connected through the channel-like steel hole, and the first water stop groove and the second water stop groove are connected to the bottom of the retractable support structure through the articulated joint;

[0011] The submerged tank is connected to the lateral support structure and the telescopic support structure;

[0012] The inserted water-stopping structure is connected to the water-stopping groove;

[0013] The flexible waterproof covering layer covers the lateral supporting structure, the telescopic supporting structure and the outer side of the submerged tank, and the flexible waterproof covering layer is connected to the telescopic supporting structure and the submerged tank.

[0014] In a possible implementation, the double-layer truss structure includes:

[0015] The upper chord, the lower chord, the diagonal webs and the vertical webs, the vertical webs are located on both sides of the double-layer truss structure, the diagonal webs are evenly distributed between the vertical webs, the upper chord and the lower chord, and the double-layer truss structure provides lateral support for the cofferdam, withstands and transmits water pressure to the retractable support structure.

[0016] In a possible implementation, the retractable support structure includes:

[0017] Top connecting plate, multi-channel supporting steel channel structure, transverse connecting plate, foldable connecting rod, connecting plate with holes and limit holes;

[0018] The top connecting plate is located at the top of the retractable supporting structure, and a plurality of supporting steel trough structures are connected below the top connecting plate. The plurality of supporting steel trough structures are connected by the transverse connecting plate. The foldable connecting rod is arranged in the space formed by the plurality of supporting steel trough structures. The foldable connecting rod is connected to the supporting steel trough structure through the connecting plate with holes, and a plurality of foldable connecting rods are hingedly connected through the limiting holes.

[0019] In a possible implementation, the cofferdam further includes a hydraulic device:

[0020] The hydraulic device is connected to the foldable connecting rod, and is used to control the movement of the telescopic supporting structure and the lateral supporting structure connected thereto by controlling the extension and extension of the foldable connecting rod.

[0021] In a possible implementation, the submerged tank includes:

[0022] A submerged tank water pump, an upper cover plate, a lower bottom plate, a left cover plate, a right cover plate, a rear cover plate, a submerged tank connecting plate and a movable hinged structure;

[0023] The rear cover plate is connected to the submerged tank connecting plate through the movable hinge structure, the upper cover plate has an opening connected to the submerged tank water pump, the submerged tank connecting plate is fixedly connected to the lateral support structure and the retractable support structure, and the angle between the rear cover plate and the submerged tank connecting plate is adjusted through the movable hinge structure to adapt to different slope ratio conditions. At the same time, the water level in the submerged tank is adjusted through the water pump to adjust the deadweight of the cofferdam structure.

[0024] In a possible implementation, the inserted water-stopping structure includes:

[0025] Support plate, flushing water-stop rubber, sealing plate and plug-in water-stop structure water pump;

[0026] The water-filled waterproof rubber is anchored on the support plate, and the sealing plates are arranged on both sides of the flushing waterproof rubber. The sealing plate close to the side of the slope is connected to the inserted waterproof structure water pump. Water is filled into the flushing waterproof rubber through the inserted waterproof structure water pump, so that the rubber, the waterproof groove and the channel lining are in close contact.

[0027] The present application also provides a construction method of a deployable water retaining cofferdam, the method comprising:

[0028] Assemble the submerged water tank, the transverse support structure and the retractable support structure, fix the submerged water tank connection plate of the submerged water tank to the front of the transverse support structure and the retractable support structure, and adjust the angle of the hinged structure between the submerged water tank connection plate and the rear cover plate to an angle that adapts to the channel slope ratio of the construction site;

[0029] The foldable connecting rod is unfolded by a hydraulic device and fixed through a locking hole, driving the lateral support structure into place to obtain the first span structure;

[0030] hoisting the first span structure to a corresponding position above the water surface;

[0031] The first span structure and the submerged tank are lowered. After the first span structure is in place, the next span structure is unfolded and connected to the first span structure. After checking the safety of the connection, the structure is put into the water. After it is in place, the next span is connected until the entire cofferdam structure is fully submerged in water;

[0032] After the cofferdam structure is launched into the water and reaches the designated position, the inserted water-stop structure is inserted into the water-stop groove, and water is filled into the water-filled water-stop rubber;

[0033] Drain the inside of the cofferdam;

[0034] Concrete works are carried out inside the cofferdam structure after drainage is completed.

[0035] Compared with the prior art, this application has the following beneficial effects:

[0036] The existing cofferdam structures are mostly welded or spliced ​​with large side panels, which are difficult to adapt to the ups and downs of the channel slope and are prone to leakage. The cofferdam of the present application adopts a lateral support structure and a retractable support structure. Through the double-layer truss structure and the articulated joint design, the cofferdam can adapt to the ups and downs of the channel slope. This flexibility significantly improves the adaptability of the cofferdam under complex terrain conditions, reduces the risk of leakage, and ensures the construction quality. When repairing large-area slopes, the traditional cofferdam structure often increases the construction difficulty due to the heavy weight of the structure and the large on-site processing error. The present application adopts a double-layer truss structure and a retractable support structure to reduce the overall weight. At the same time, the first bolt connection plate and the first bolt connection plate are assembled, which is simple and quick to operate. This not only reduces the construction difficulty, but also shortens the installation time and improves the overall construction efficiency. In the prior art, the repair efficiency in a dynamic water environment is low and may even pollute the water source. The present application effectively realizes the water stopping function by designing an inserted water-stopping structure and a flexible waterproof covering layer to prevent water from seeping into the repair area. The flexible waterproof covering layer covers the entire outer side of the cofferdam and is connected to the retractable support structure and the submerged water tank, ensuring the waterproof performance of the entire structure and further improving the safety and reliability of the repair process. The deployable water retaining cofferdam of this application has significant advantages in terms of adaptability, weight, assembly convenience, water-stopping function, construction environment optimization and scalability. By using the cofferdam provided by this application, the construction quality of the lining structure repair project can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 A top view of a deployable water retaining cofferdam provided in an embodiment of the present application;

[0039] Figure 2 A transverse cross-sectional view of a deployable water retaining cofferdam provided in an embodiment of the present application;

[0040] Figure 3 A cross-sectional view perpendicular to the water flow direction of a deployable water retaining cofferdam provided in an embodiment of the present application;

[0041] Figure 4 A schematic structural diagram of a water stop groove of a deployable water retaining cofferdam provided in an embodiment of the present application;

[0042] Figure 5 A schematic structural diagram of a double-layer truss structure provided in an embodiment of the present application;

[0043] Figure 6 A schematic structural diagram of a retractable support structure provided in an embodiment of the present application;

[0044] Figure 7 A schematic diagram of the structure of a submerged tank provided in an embodiment of the present application;

[0045] Figure 8 A schematic structural diagram of an insertable water-stopping structure provided in an embodiment of the present application;

[0046] Fig. 9 A flow chart of a construction method for an expandable water retaining cofferdam provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] As described above, by building cofferdams, a dry land construction environment is created, and large-scale lining structure repairs are achieved. By building cofferdams, dry land construction is created when the channel has a large flow rate, ensuring construction safety and preventing damage to water quality during construction as much as possible. However, most of the existing cofferdam structures are welded or spliced ​​with large side panels, which are difficult to adapt to the undulating channel slopes. When the slope area to be repaired is large, the entire cofferdam structure is too heavy, and the on-site processing error is large and the precision is low, which is prone to leakage, affecting the construction quality.

[0048] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] Figure 1 A top view of a deployable water retaining cofferdam provided in an embodiment of the present application, Figure 2 A transverse cross-sectional view of a deployable water retaining cofferdam provided in an embodiment of the present application, Figure 3 A cross-sectional view perpendicular to the water flow direction of an expandable water retaining cofferdam provided in an embodiment of the present application.

[0050] In order to explain the deployable water retaining cofferdam more clearly, Figure 1-Figure 3 Provide explanation.

[0051] Figure 1 The arrow in the middle is perpendicular to the direction of water flow. Figure 1 The double-layer truss structure (1) may include a lateral support structure along the water flow direction, wherein the lateral support structure includes a plurality of double-layer truss structures (1). Figure 3 As shown, it is composed of three parts: left, middle and right. Adjacent double-layer truss structures (1) are connected by a first bolt connection plate (2). Multiple double-layer truss structures (1) are connected to a telescopic support structure (3) through the first bolt connection plate (2). The telescopic support structure (3) is used to realize the contraction and expansion of the structure and provide vertical support for the cofferdam structure.

[0052] In order to illustrate the water stop groove, the present application embodiment provides a structural schematic diagram of a water stop groove of a deployable water retaining cofferdam. Figure 4 A schematic structural diagram of a water stop groove of an expandable water retaining cofferdam provided in an embodiment of the present application.

[0053] The outer side of the telescopic support structure (3) is connected to a water stop groove (5). The water stop groove (5) comprises a first water stop groove (501) and a second water stop groove (502). Both water stop grooves are composed of a hinge joint (503) and a channel-like steel (504). The side of the channel-like steel (504) is opened to form a channel-like steel hole (505). The two water stop grooves are connected through the channel-like steel hole (505) and are connected to the bottom of the telescopic support structure (3) through a hinge joint.

[0054] The submerged tank (6) is connected to the lateral support structure and the telescopic support structure (3).

[0055] The inserted water-stop structure (7) is connected to the water-stop groove (6).

[0056] The flexible waterproof covering layer (8) covers the outside of the lateral support structure, the telescopic support structure (3) and the submerged tank (6), and the flexible waterproof covering layer (8) is connected to the telescopic support structure (3) and the submerged tank (6). The flexible waterproof covering layer (8) is used to waterproof the interior of the entire cofferdam, and after pumping out water, the interior of the cofferdam is ensured to be a dry environment.

[0057] Figure 5A schematic diagram of a double-layer truss structure provided in an embodiment of the present application, Figure 5 The double-layer truss structure comprises an upper chord (101), a lower chord (102), a diagonal web member (103) and a vertical web member (104). The vertical web member (104) is located on both sides of the double-layer truss structure. The diagonal web member (103) is evenly distributed between the vertical web member (104), the upper chord (101) and the lower chord (102). The double-layer truss structure provides lateral support for the cofferdam, and bears and transmits water pressure to the retractable support structure.

[0058] Figure 6 A schematic diagram of a retractable support structure provided in an embodiment of the present application, Figure 6 The invention comprises a top connecting plate (301), a plurality of supporting steel trough structures (302), a transverse connecting plate (303), a foldable connecting rod (304), a connecting plate with holes (305) and a limiting hole (306).

[0059] The top connecting plate (301) is located at the top of the telescopic support structure. The bottom of the top connecting plate (301) is connected to a plurality of supporting steel trough structures (302). The plurality of supporting steel trough structures (302) are connected via a transverse connecting plate (303). The transverse connecting plate (303) provides internal transverse support. A foldable connecting rod (304) is arranged in the space formed by the plurality of supporting steel trough structures (302). The foldable connecting rod (304) is connected to the supporting steel trough structure (302) via a connecting plate with holes (305). The plurality of foldable connecting rods (304) are hingedly connected via limiting holes (306).

[0060] The hydraulic device (4) is connected to the foldable connecting rod (304), and the hydraulic device (4) is used to control the movement of the telescopic support structure (3) and the lateral support structure connected thereto by controlling the extension and extension of the foldable connecting rod (304). When the foldable connecting rod (304) is extended, the supporting channel steel structure (302) moves accordingly, and the first water stop groove (501) and the second water stop groove (502) are extended under the drive of the supporting channel steel structure (302), thereby providing installation space for the inserted water stop structure (7).

[0061] Figure 7 A schematic structural diagram of a submerged tank provided in an embodiment of the present application, wherein the submerged tank comprises a submerged tank water pump (608), an upper cover plate (601), a lower bottom plate (602), a left cover plate (603), a right cover plate (604), a rear cover plate (605), a submerged tank connecting plate (606) and a movable hinged structure (607).

[0062] The rear cover plate (605) is connected to the submerged tank connection plate (606) via a movable hinge structure (607); the upper cover plate (601) is provided with a hole and is connected to the submerged tank water pump (608) via the hole; the submerged tank connection plate (606) is fixedly connected to the lateral support structure and the telescopic support structure (3); the angle between the rear cover plate (605) and the submerged tank connection plate (606) is adjusted via the movable hinge structure (607) to adapt to different slope ratio conditions; and the water level in the submerged tank is adjusted via the water pump (608) to adjust the deadweight of the cofferdam structure.

[0063] Figure 8 A schematic diagram of the structure of an insertable water-stopping structure provided in an embodiment of the present application is shown in FIG. Figure 8 The invention comprises a support plate (701), a flushing water-stopping rubber (702), a sealing plate (703) and an inserted water-stopping structure water pump (704).

[0064] The water-filled waterproof rubber (702) is anchored on the support plate (701), and sealing plates (703) are arranged on both sides of the flushing waterproof rubber (702). The sealing plate (703) close to the bank slope is connected to the inserted waterproof structure water pump (704), and water is filled into the flushing waterproof rubber (702) through the inserted waterproof structure water pump (704), so that the rubber and the waterproof groove and the channel lining are in close contact.

[0065] The existing cofferdam structures are mostly welded or spliced ​​with large side panels, which are difficult to adapt to the ups and downs of the channel slope and are prone to leakage. The cofferdam of the present application adopts a lateral support structure and a retractable support structure. Through the double-layer truss structure and the articulated joint design, the cofferdam can adapt to the ups and downs of the channel slope. This flexibility significantly improves the adaptability of the cofferdam under complex terrain conditions, reduces the risk of leakage, and ensures the construction quality. When repairing large-area slopes, the traditional cofferdam structure often increases the construction difficulty due to the heavy weight of the structure and the large on-site processing error. The present application adopts a double-layer truss structure and a retractable support structure to reduce the overall weight. At the same time, the first bolt connection plate and the first bolt connection plate are assembled, which is simple and quick to operate. This not only reduces the construction difficulty, but also shortens the installation time and improves the overall construction efficiency. In the prior art, the repair efficiency in a dynamic water environment is low and may even pollute the water source. The present application effectively realizes the water stopping function by designing an inserted water-stopping structure and a flexible waterproof covering layer to prevent water from seeping into the repair area. The flexible waterproof covering layer covers the entire outer side of the cofferdam and is connected to the retractable support structure and the submerged water tank, ensuring the waterproof performance of the entire structure and further improving the safety and reliability of the repair process. The deployable water retaining cofferdam of this application has significant advantages in terms of adaptability, weight, assembly convenience, water-stopping function, construction environment optimization and scalability. By using the cofferdam provided by this application, the construction quality of the lining structure repair project can be improved.

[0066] During the construction of the lining structure repair project, the lateral support structure, the retractable support structure, the flexible waterproof covering layer and their connections are all completed on the horseway and the bank slope. The horseway is a transportation road or platform in the water conservancy project.

[0067] The cofferdam is divided into several spans, each span consists of several retractable supporting structures connected to the left and right by the transverse supporting structure. The construction adopts the method of unfolding the spans, connecting and putting them into the water. When the structure of each span is assembled on the shore, the foldable connecting rod should be retracted into the channel steel.

[0068] The device is placed above the water surface by a winch and a crane, unfolded into the water, and after unfolding, the foldable connecting rod is locked through the limit hole to ensure the stability of the device structure. After the first span is completely submerged in water, the next span is unfolded, connected and submerged in water in sequence.

[0069] After the device is completely submerged in water, install the inserted water-stop structure, fill the water-filled water-stop rubber with water, adjust the water level of the submerged tank, and press the lining surface under the action of the structure's own weight to complete the water-stopping of the device and form a relatively closed space inside the device.

[0070] After that, the water inside the device is drained, and the water volume in the submerged tank is adjusted to form a dry construction environment, providing a safe working space for channel slope repair. After the damaged lining plate is repaired, the water in the water-filled water-stop rubber is discharged, and the channel water enters the device; then the device is recovered and disassembled using a winch and a crane to complete the repair of the damaged lining plate on the channel slope.

[0071] The present application also provides a Fig. 9 The construction method flow chart of the deployable water retaining cofferdam is shown in FIG. Fig. 9 Included:

[0072] S901: Assemble the submerged tank, the transverse support structure and the retractable support structure, fix the submerged tank connection plate of the submerged tank to the front of the transverse support structure and the retractable support structure, and adjust the angle of the hinged structure between the submerged tank connection plate and the rear cover plate to adapt to the channel slope ratio of the construction site.

[0073] It is understandable that materials need to be transported before assembly. The transverse support structure, the retractable vertical support structure, the water stop groove, the submerged water tank, the plug-in water stop structure and the flexible waterproof covering layer and other components can be transported to the channel repair construction site by a truck or other transportation device. The transverse support structure, the retractable vertical support structure and the submerged water tank are spliced ​​and connected together by on-site splicing. The submerged water tank connection plate of the submerged water tank is fixed to the front of the transverse support structure and the retractable support structure. The angle of the hinged structure between the submerged water tank connection plate and the rear cover plate is adjusted to an angle that adapts to the channel slope ratio of the construction site. At this time, the foldable connecting rod in the retractable vertical support structure is in a retracted state.

[0074] S902: The foldable connecting rod is unfolded by a hydraulic device and fixed through the locking hole, driving the lateral support structure into place to obtain the first span structure.

[0075] It is understandable that the foldable connecting rod needs to be unfolded before going to sleep. The foldable connecting rod can be unfolded by a hydraulic device and fixed through the locking hole, so as to drive the lateral support structure into place and obtain the first span structure.

[0076] S903: Lift the first span structure to the corresponding position on the water surface.

[0077] It will be appreciated that in order to simplify the installation steps, the flexible waterproof covering layer may be connected before entering the water.

[0078] Connect the flexible waterproof covering layer to the first span transverse support structure, the retractable vertical support structure and the submerged tank. With the help of a winch and a small crane, place the first span structure above the water surface along the channel slope. After checking the safety and reliability of the flexible covering material, prepare to enter the water.

[0079] S904: Lower the first span structure and the submerged tank. After the first span structure is in place, unfold the next span structure and connect it to the first span structure. After checking the safety of the connection, put the structure into the water. After it is in place, connect the next span until the entire cofferdam structure is fully submerged in water.

[0080] The first span structure and submerged tank are slowly unfolded and lowered through the control of the roller shutter and crane. After the first span structure is in place, the next span structure is unfolded and connected to the first span structure. After checking the safety of the connection, the structure is put into the water. After it is in place, the next span is connected until the entire cofferdam structure is fully submerged. During the launching process, the stress conditions of each hanging point need to be monitored to ensure that the stress of the hanging points is uniform as much as possible. At the same time, multiple monitoring points are arranged on the surface of the cofferdam to determine the position of the cofferdam, and the lateral deviation of the cofferdam structure is reduced through adjustment through upstream and downstream pulling equipment to ensure the accurate lowering position of the cofferdam. Observations should be carried out during the lowering process, and alarm measures should be designed. Once the monitoring value exceeds the design range, it needs to be adjusted in time.

[0081] The cofferdam is put into water one span at a time. With the help of lifting equipment and hydraulic devices, the first span structure is deployed into the water. After the first span structure and the submerged tank are in place, the next span is deployed, fixed and connected through the limit holes, and sent underwater. During the entry into the water, the speed of the cofferdam device entering the water is controlled by the lifting ropes arranged around the cofferdam structure to ensure the stability of the device under the impact of dynamic water until the cofferdam is completely submerged in water.

[0082] S905: After the cofferdam structure is launched into the water and reaches the designated position, the inserted water-stop structure is inserted into the water-stop groove, and water is filled into the water-filled water-stop rubber.

[0083] After the cofferdam structure is launched and reaches the designated position, the water stop structure is inserted through the bottom folding water stop groove and installed at the bottom of the cofferdam. Water is filled into the water-filled water stop rubber. During the process, the water pressure inside the water-filled water stop rubber must be closely monitored. After that, the cofferdam is drained. During the drainage process, the water level drop speed is controlled to avoid the slope instability caused by too fast a drop in the water level. At the same time, the water level in the submerged tank and the traction force of the pulling equipment are adjusted by the water pump to keep the cofferdam stable and ensure that the overall force of the cofferdam and the force of the lining plate are within the design requirements.

[0084] S906: Drain the inner part of the cofferdam.

[0085] After the inserted water-stop structure is in place, use a water pump to fill the water-filled water-stop rubber with water, and at the same time adjust the water volume in the submerged tank until the water-stop structure is completely in contact with the bottom of the channel to complete the water-stopping work; use a water pump to drain the cofferdam to create a dry land construction environment.

[0086] S907: Carry out concrete construction within the cofferdam structure after drainage is completed.

[0087] After the water inside the cofferdam is drained, the damaged lining plate of the channel slope is repaired. After the lining repair is completed, the water in the water-filled water-stop structure is drained, and after the cofferdam is filled with water again, the cofferdam structure is folded and retracted using a winch and a crane to complete the entire channel lining repair work.

[0088] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is merely schematic, in which the unit described as a separate component may or may not be physically separated, and the component prompted as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0089] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A deployable water retaining cofferdam, characterized in that: include: A lateral support structure along the water flow direction, a retractable support structure perpendicular to the water flow direction, a flexible waterproof covering layer, a water stop groove, an inserted water stop structure and a submerged tank; The transverse support structure includes a plurality of double-layer truss structures, adjacent double-layer truss structures are connected by a first bolt connection plate, and the plurality of double-layer truss structures are connected to the telescopic support structure by the first bolt connection plate, and the telescopic support structure is used to provide vertical support for the cofferdam; The outer side of the retractable support structure is connected to the water stop groove, the water stop groove includes a first water stop groove and a second water stop groove, the first water stop groove and the second water stop groove both include an articulated joint and a channel-like steel, the side of the channel-like steel includes a channel-like steel hole, the first water stop groove and the second water stop groove are connected through the channel-like steel hole, and the first water stop groove and the second water stop groove are connected to the bottom of the retractable support structure through the articulated joint; The submerged tank is connected to the lateral support structure and the telescopic support structure; The inserted water-stopping structure is connected to the water-stopping groove; The flexible waterproof covering layer covers the lateral supporting structure, the telescopic supporting structure and the outer side of the submerged tank, and the flexible waterproof covering layer is connected to the telescopic supporting structure and the submerged tank.

2. The cofferdam according to claim 1, characterized in that: The double-layer truss structure comprises: The upper chord, the lower chord, the diagonal webs and the vertical webs, the vertical webs are located on both sides of the double-layer truss structure, the diagonal webs are evenly distributed between the vertical webs, the upper chord and the lower chord, and the double-layer truss structure provides lateral support for the cofferdam, withstands and transmits water pressure to the retractable support structure.

3. The cofferdam according to claim 1, characterized in that: The retractable support structure comprises: Top connecting plate, multi-channel supporting steel channel structure, transverse connecting plate, foldable connecting rod, connecting plate with holes and limit holes; The top connecting plate is located at the top of the retractable supporting structure, and a plurality of supporting steel trough structures are connected below the top connecting plate. The plurality of supporting steel trough structures are connected by the transverse connecting plate. The foldable connecting rod is arranged in the space formed by the plurality of supporting steel trough structures. The foldable connecting rod is connected to the supporting steel trough structure through the connecting plate with holes, and a plurality of foldable connecting rods are hingedly connected through the limiting holes.

4. The cofferdam according to claim 3, characterized in that: The cofferdam further comprises a hydraulic device: The hydraulic device is connected to the foldable connecting rod, and is used to control the movement of the telescopic supporting structure and the lateral supporting structure connected thereto by controlling the extension and extension of the foldable connecting rod.

5. The cofferdam according to claim 1, characterized in that: The submerged tank comprises: A submerged tank water pump, an upper cover plate, a lower bottom plate, a left cover plate, a right cover plate, a rear cover plate, a submerged tank connecting plate and a movable hinged structure; The rear cover plate is connected to the submerged tank connecting plate through the movable hinge structure, the upper cover plate has an opening connected to the submerged tank water pump, the submerged tank connecting plate is fixedly connected to the lateral support structure and the retractable support structure, and the angle between the rear cover plate and the submerged tank connecting plate is adjusted through the movable hinge structure to adapt to different slope ratio conditions. At the same time, the water level in the submerged tank is adjusted through the water pump to adjust the deadweight of the cofferdam structure.

6. The cofferdam according to claim 1, characterized in that: The inserted water-stopping structure comprises: Support plate, flushing water-stop rubber, sealing plate and plug-in water-stop structure water pump; The water-filled waterproof rubber is anchored on the support plate, and the sealing plates are arranged on both sides of the flushing waterproof rubber. The sealing plate close to the side of the slope is connected to the inserted waterproof structure water pump. Water is filled into the flushing waterproof rubber through the inserted waterproof structure water pump, so that the rubber, the waterproof groove and the channel lining are in close contact.

7. A construction method for a deployable water retaining cofferdam, characterized in that: include: Assemble the submerged water tank, the transverse support structure and the retractable support structure, fix the submerged water tank connection plate of the submerged water tank to the front of the transverse support structure and the retractable support structure, and adjust the angle of the hinged structure between the submerged water tank connection plate and the rear cover plate to an angle that adapts to the channel slope ratio of the construction site; The foldable connecting rod is unfolded by a hydraulic device and fixed through a locking hole, driving the lateral support structure into place to obtain the first span structure; hoisting the first span structure to a corresponding position above the water surface; The first span structure and the submerged tank are lowered. After the first span structure is in place, the next span structure is unfolded and connected to the first span structure. After checking the safety of the connection, the structure is put into water. After it is in place, the next span is connected until the entire cofferdam structure is fully submerged in water; After the cofferdam structure is launched into the water and reaches the designated position, the inserted water-stop structure is inserted into the water-stop groove, and water is filled into the water-filled water-stop rubber; Drain the inside of the cofferdam; Concrete works are carried out inside the cofferdam structure after drainage is completed.

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