An underwater pool wall concrete opening steel cofferdam supporting device

Abstract

The utility model discloses an underwater pool wall concrete opening steel cofferdam supporting device, including concrete pool wall and steel sheet cofferdam, the concrete pool wall is right angle trapezoid with steel sheet cofferdam, be equipped with framework structure between the concrete pool wall and steel sheet cofferdam, the steel sheet cofferdam is fixed in the inside of concrete pool wall through framework structure, the concrete pool wall is equipped with water conduit hole, be equipped with water conduit in the water conduit hole, still be equipped with concrete bottom wall under the concrete pool wall, still be equipped with support square tube and branch pipe on the concrete bottom wall, the framework structure is fixed on the concrete bottom wall through support square tube, this underwater pool wall concrete opening steel cofferdam supporting device can provide waterless operation surface under the normal water supply condition of water pool, realizes pool wall waterless opening operation, and the whole structure is stable and the sealing property is strong, can make in advance fast installation, also can be recycled, and the practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering facilities technology, and in particular to an underwater pool wall concrete perforated steel cofferdam support device. Background Technology

[0002] Existing traditional cofferdam structures mainly include earth-rock cofferdams, wooden piling cofferdams, burlap sack cofferdams, interlocking steel cofferdams, and double-arm steel cofferdams. Among these traditional cofferdam methods, earth-rock cofferdams are mainly suitable for situations with shallow water depth, low flow velocity, and low seepage in the riverbed soil. Wooden piling cofferdams are mainly suitable for shallow underwater foundations, but the columns of wooden piling cofferdams cannot be driven into the reinforced concrete pool structure, resulting in poor safety and stability. Earth-rock and burlap sack cofferdams, when in operation, not only consume a lot of manpower and resources in the intake pool but also pollute the water quality. Double-arm steel cofferdams and interlocking steel pipe cofferdams not only require large investments but are also unsuitable for opening and sealing operations on the side walls of the intake pool.

[0003] With the rapid development of the water conservancy engineering industry in recent years, the demand for high-quality drinking water sources has been increasing. Therefore, it is inevitable to drill holes in the existing intake forebay for water diversion. The modification of the intake bay is different from other structures, requiring the drilling operation to be carried out without affecting the normal water supply. However, the traditional cofferdams mentioned above are not suitable for drilling holes in the pool wall structure in water. Therefore, there is an urgent need for a cofferdam structure that can carry out drilling operations without water under normal water flow conditions in the pool. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned problems by providing an underwater pool wall concrete perforation steel cofferdam support device that can provide a waterless working surface under normal water flow conditions, realize waterless opening operation of the pool wall, has a stable overall structure and strong sealing performance, can be prefabricated and quickly installed, and can be recycled.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: an underwater pool wall concrete perforated steel cofferdam support device, comprising a concrete pool wall and a steel plate cofferdam, wherein the concrete pool wall and the steel plate cofferdam form a right-angled trapezoid, and a frame structure is provided between the concrete pool wall and the steel plate cofferdam, wherein the steel plate cofferdam is fixed to the inner side of the concrete pool wall through the frame structure, and a water inlet pipe hole is provided in the concrete pool wall, wherein a water inlet pipe is provided in the water inlet pipe hole.

[0006] Preferably, a concrete bottom wall is provided below the concrete pool wall, and a supporting square tube and a branch pipe are provided on the concrete bottom wall. The skeleton structure is fixed to the concrete bottom wall by the supporting square tube.

[0007] Preferably, the skeleton structure includes multiple longitudinal supports, transverse supports, diagonal supports, and square tubes. The longitudinal supports are vertically arranged along the height of the steel plate cofferdam. The transverse supports are welded between every two longitudinal supports. The diagonal supports are inclined and welded to the longitudinal supports and square tubes. One end of the square tube is welded to the longitudinal support, and the other end extends towards the concrete pool wall.

[0008] Preferably, the top of the skeleton structure is provided with a first channel steel parallel to the square tube, and the end of the first channel steel is provided with a second channel steel welded vertically. The second channel steel is fixedly connected to the concrete pool wall by expansion bolts.

[0009] Preferably, the steel plate cofferdam has an inwardly bent edge at the end of the vertical side, the bent edge is located between the second channel steel and the concrete pool wall, the bent edge and the concrete pool wall are provided with sealant, and the bent edge, the second channel steel and the concrete pool wall are fixedly connected by expansion bolts.

[0010] Preferably, rubber water-blocking curtains are provided at the joints between the steel plate cofferdam and the concrete pool wall and concrete bottom wall.

[0011] This utility model discloses an underwater pool wall concrete perforation steel cofferdam support device, comprising a concrete pool wall and a steel plate cofferdam. The concrete pool wall and the steel plate cofferdam form a right-angled trapezoid. A skeleton structure is provided between the concrete pool wall and the steel plate cofferdam. The steel plate cofferdam is fixed to the inner side of the concrete pool wall through the skeleton structure. A water inlet pipe hole is provided inside the concrete pool wall, and a water inlet pipe is provided in the water inlet pipe hole. A concrete bottom wall is also provided below the concrete pool wall. A supporting square tube and a branch pipe are provided on the concrete bottom wall. The skeleton structure is fixed to the concrete bottom wall through the supporting square tube. Compared with the prior art, this underwater pool wall concrete perforation steel cofferdam support device has the advantages of providing a waterless working surface under normal water flow conditions, realizing waterless perforation operation of the pool wall, and having a stable overall structure with strong sealing performance. It can be prefabricated and quickly installed, and can also be reused. Attached Figure Description

[0012] Figure 1 This is a top view of an underwater pool wall concrete perforated steel cofferdam support device according to the present invention.

[0013] Figure 2 This is a top view of the concrete pool wall and steel plate cofferdam in the underwater pool wall perforated steel cofferdam support device of this utility model.

[0014] Figure 3 This is a side sectional view of an underwater pool wall concrete perforated steel cofferdam support device according to the present invention.

[0015] Figure 4This is a schematic diagram showing the connection between the concrete pool wall and the steel plate cofferdam in this utility model.

[0016] Figure 5 This is a schematic diagram showing the connection between the concrete pool wall and the first and second channel steels in this utility model.

[0017] In the diagram: 1. Concrete pool wall; 11. Concrete bottom wall; 111. Branch pipe; 12. Water inlet pipe hole; 13. Water inlet pipe; 2. Steel plate cofferdam; 21. Folded edge; 3. Skeleton structure; 31. Longitudinal support; 32. Lateral support; 33. Diagonal support; 34. Square tube; 4. First channel steel; 5. Second channel steel; 6. Expansion bolt; 7. Supporting square tube; 8. Sealant; 9. Rubber water barrier curtain. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0019] Please refer to Figure 1-5 An underwater pool wall concrete perforated steel cofferdam support device includes a concrete pool wall 1 and a steel plate cofferdam 2. The concrete pool wall 1 and the steel plate cofferdam 2 are in the shape of a right trapezoid, that is, the steel plate cofferdam 2 is bent at an angle of 150-160°, which is conducive to backflow of water and avoids water flow impacting the cofferdam. A frame structure 3 is provided between the concrete pool wall 1 and the steel plate cofferdam 2. The steel plate cofferdam 2 is fixed to the inner side of the concrete pool wall 1 through the frame structure 3. A water inlet pipe hole 12 is provided in the concrete pool wall 1, and a water inlet pipe 13 is provided in the water inlet pipe hole 12.

[0020] When in use, the steel plate cofferdam 2 is connected to the concrete pool wall 1, forming a closed cofferdam inside, providing space for drilling.

[0021] The concrete pool wall 1 is provided below a concrete bottom wall 11, and a supporting square tube 7 is provided on the concrete bottom wall 11. The frame structure 3 is fixed to the concrete bottom wall 11 by the supporting square tube 7. In addition, a branch pipe 111 is provided on the concrete bottom wall 11, and a butterfly valve is provided on the branch pipe 111.

[0022] In this embodiment, the skeleton structure 3 includes multiple longitudinal supports 31, transverse supports 32, diagonal supports 33, and square tubes 34. The longitudinal supports 31 are vertically arranged and welded along the height of the steel plate cofferdam 2. The transverse supports 32 are welded between every two longitudinal supports 31. The diagonal supports 33 are inclined and welded to the longitudinal supports 31 and the square tubes 34. One end of the square tube 34 is welded to the longitudinal support 31, and the other end extends toward the concrete pool wall 1. The extended end is fixed by expansion bolts.

[0023] The top of the skeleton structure 3 is provided with a first channel steel 4 parallel to the square tube 34, and the end of the first channel steel 4 is provided with a second channel steel 5 welded vertically. The second channel steel 5 is fixedly connected to the concrete pool wall 1 by expansion bolts 6.

[0024] To improve the sealing performance of the steel plate cofferdam, the steel plate cofferdam 2 has an inwardly bent edge 21 at the end of its vertical side. The bent edge 21 is located between the second channel steel 5 and the concrete pool wall 1, and a sealant 8 is provided between the bent edge 21 and the concrete pool wall 1. The bent edge 21, the second channel steel 5, and the concrete pool wall 1 are fixedly connected by expansion bolts 6. After the expansion bolts are fixed, the second channel steel 5, the bent edge 21, the sealant 8, and the concrete pool wall 1 are tightly fitted together, which can achieve the sealing of the cofferdam and prevent water seepage.

[0025] In addition, rubber water-blocking curtains 9 are provided at the joints between the steel plate cofferdam 2 and the concrete pool wall 1 and the concrete bottom wall 11. The rubber water-blocking curtains 9 are flexible waterproof barriers made of high-strength rubber material, which have flexible compression characteristics. They are set at the gaps between the steel cofferdam and the concrete side wall and bottom plate to prevent water from seeping into the construction area through the gaps of the cofferdam, which can effectively solve the problem of water seepage and leakage of the steel cofferdam.

[0026] The construction steps for this underwater pool wall concrete perforated steel cofferdam support device are as follows:

[0027] 1. Due to the sedimentation of algae in the water storage tank, there is a certain layer of silt in the concrete of the underwater pool wall and foundation. In order to ensure that the steel plate cofferdam 2 is tightly attached to the concrete pool wall foundation, the concrete pool wall must be cleaned first.

[0028] 2. Welded frame structure and steel plate cofferdam;

[0029] 3. Rubber water-blocking curtains are installed along the edges of the steel plate cofferdam. When installing the rubber water-blocking curtains, ensure they are tightly fitted to the surface of the steel plate cofferdam to avoid gaps. Bolts, pressure strips, and other fixing devices are typically used to secure the water-blocking curtains to the steel plate cofferdam. Regularly check the sealing performance of the rubber water-blocking curtains and promptly clean any debris and sediment from the surface to ensure their long-term effective waterproofing performance. Strict quality control is required during installation to ensure a tight fit between the rubber water-blocking curtains and the steel cofferdam, preventing water seepage due to improper installation. As a highly efficient waterproofing facility, the rubber water-blocking curtain for steel cofferdams plays a vital role in modern engineering construction, effectively improving construction safety and efficiency.

[0030] 4. Hoisting the steel plate cofferdam to the predetermined position is one of the key steps in the construction of the steel cofferdam. It requires precise positioning and operation to ensure that the cofferdam can be installed accurately and safely.

[0031] 5. Sidewall expansion bolt fixing: In the construction of steel cofferdams, expansion bolts are used to connect the steel cofferdam to the concrete structure. Expansion bolts, through the principle of mechanical expansion, can provide strong anchoring force, ensuring the stability and safety of the steel cofferdam.

[0032] 6. Apply silicone structural sealant to the sidewalls; during the construction and use of steel plate cofferdams, applying silicone structural sealant to the sidewalls is an effective waterproofing and sealing measure. Silicone structural sealant has excellent waterproofing, weather resistance, and elasticity, and can effectively prevent water from seeping into the construction area through the joints or tiny gaps in the sidewalls of the steel cofferdam;

[0033] 7. Close the bottom butterfly valve to clean the sludge; after closing the butterfly valve, use a high-pressure water gun to disperse the sludge, and after the mud and water are mixed, open the butterfly valve and pump it into the sedimentation tank through the mud pump.

[0034] 8. Forming a closed cofferdam provides a working surface; by enclosing and isolating the water environment, the aquatic environment is transformed into a dry construction area, creating conditions for subsequent foundation construction. After the steel cofferdam is closed, a working surface is available for concrete pool wall demolition, pipeline laying, and concrete pouring. C30 self-compacting concrete is used. Once the concrete strength reaches the design strength, the formwork is removed.

[0035] 9. Remove internal supports and steel plate cofferdam connecting bolts, and clean the site; After the steel cofferdam construction is completed, removing internal supports and connecting bolts and cleaning the site is a crucial part of the final stage. This process must be carried out strictly in accordance with the construction plan and safety specifications to ensure the safety and efficiency of the dismantling operation; confirm whether the water level difference inside and outside the cofferdam is controllable to avoid leakage or structural instability during dismantling. Check the overall stability of the cofferdam structure to ensure that the dismantling operation will not cause collapse or tilting; dismantle internal supports (such as horizontal braces, diagonal braces, etc.) step by step according to the principle of "secondary first, then major". After each dismantling, check the stability of the cofferdam structure, and continue the work only after confirming that there are no abnormalities. Use gas cutting equipment or a cutting machine to separate the support structure from the cofferdam. Use a crane to lift the dismantled support components away from the site to avoid piling them up inside the cofferdam and affecting subsequent operations. This device can open the side wall under normal water flow conditions, overcoming the need for water sealing during pool operation; it has a stable overall structure with high strength and rigidity, and can withstand high water pressure and side wall concrete pressure. At the same time, the rubber water curtain can ensure water-free operation inside the cofferdam. The whole device can be prefabricated and quickly assembled on site, improving construction efficiency, and it can be disassembled and reused.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A support device for an underwater pool wall with perforated concrete and steel cofferdam, characterized in that, The system includes a concrete pool wall and a steel plate cofferdam. The concrete pool wall and the steel plate cofferdam are in the shape of a right trapezoid. A frame structure is provided between the concrete pool wall and the steel plate cofferdam. The steel plate cofferdam is fixed to the inside of the concrete pool wall through the frame structure. A water inlet pipe hole is provided inside the concrete pool wall, and a water inlet pipe is provided inside the water inlet pipe hole.

2. The underwater pool wall concrete perforated steel cofferdam support device according to claim 1, characterized in that, Below the concrete pool wall is a concrete bottom wall, and above the concrete bottom wall are supporting square tubes and branch pipes. The skeleton structure is fixed to the concrete bottom wall by the supporting square tubes.

3. The underwater pool wall concrete perforated steel cofferdam support device according to claim 1 or 2, characterized in that, The skeleton structure includes multiple longitudinal supports, transverse supports, diagonal supports, and square tubes. The longitudinal supports are vertically arranged along the height of the steel plate cofferdam. The transverse supports are welded between every two longitudinal supports. The diagonal supports are inclined and welded to the longitudinal supports and square tubes. One end of the square tube is welded to the longitudinal support, and the other end extends towards the concrete pool wall.

4. The underwater pool wall concrete perforated steel cofferdam support device according to claim 3, characterized in that, The top of the skeleton structure is also provided with a first channel steel parallel to the square tube, and the end of the first channel steel is provided with a second channel steel welded vertically. The second channel steel is fixedly connected to the concrete pool wall by expansion bolts.

5. The underwater pool wall concrete perforated steel cofferdam support device according to claim 1, characterized in that, The steel plate cofferdam has an inwardly bent edge at the end of the vertical side. The bent edge is located between the second channel steel and the concrete pool wall. Sealant is applied between the bent edge and the concrete pool wall. The bent edge, the second channel steel and the concrete pool wall are fixedly connected by expansion bolts.

6. The underwater pool wall concrete perforated steel cofferdam support device according to claim 1, characterized in that, Rubber water-blocking curtains are installed at the joints between the steel plate cofferdam and the concrete pool wall and concrete bottom wall.

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