Cofferdam convenient to close

Abstract

The utility model relates to the technical field of cofferdams, and particularly discloses a cofferdam convenient to close, which comprises a fence and a pile chain cofferdam, the pile chain cofferdam comprises fixed piles and a chain net, the fixed piles are fixed to the river bottom, and the chain net is arranged on the fixed piles and protects water flow in multiple directions; the fence is arranged outside the pile chain cofferdam and installed at the river bottom through the positioning piles. The cofferdam is used for solving the problem that the closure gap of the cofferdam is inconvenient to close in the prior art.

Description

A cofferdam that facilitates closure Technical Field

[0001] This utility model relates to the field of cofferdam technology, specifically to a cofferdam that is easy to close. Background Technology

[0002] A cofferdam is a temporary water-retaining structure built around the construction area of ​​a building in water conservancy projects or other water-related construction projects to create dry construction conditions. A cofferdam can block water flow, isolate the construction area from external water bodies, allow construction to proceed under dry conditions, ensure the construction quality and safety of underwater components such as foundations and piers, and guide water flow along a designed channel to ensure smooth river flow during construction and prevent scouring and disturbance of the construction area.

[0003] Closing refers to the process of constructing a dam or bridge by starting construction from both ends and finally joining them in the middle. Closing a cofferdam refers to the process of constructing both ends of a cofferdam simultaneously and then joining them in the middle to form a complete cofferdam. The section of the cofferdam where the closure is performed is called the "closing section," and the point where the closure occurs is called the "dragon's mouth," also known as the "closing mouth."

[0004] When diverting water from major rivers, building cofferdams is a challenging task, especially when the cofferdams are being closed. The water flow at the closure point is too rapid, with a high velocity and strong scouring force, which can easily erode the cofferdams on both sides and the bottom of the riverbed at the closure point. It can also easily wash away the stones used for filling, making the construction of the cofferdam very difficult. Summary of the Invention

[0005] This invention provides a cofferdam that facilitates closure, thereby solving the problem in the prior art where the closure of the cofferdam at the slit is inconvenient.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A cofferdam that facilitates closure includes a fence and a pile-chain cofferdam; the pile-chain cofferdam includes fixed piles and a chain net, the fixed piles are fixed to the riverbed, the chain net is set on the fixed piles, and the chain net protects against water flow in multiple directions; the fence is set outside the pile-chain cofferdam and is installed on the riverbed by positioning piles.

[0008] Furthermore, the fence includes an outer perimeter fence and an inner perimeter fence, with a gap between the outer perimeter fence and the inner perimeter fence, and a positioning post is installed in the gap.

[0009] Furthermore, the pile chain cofferdam includes two rows of evenly distributed fixed piles, which form a rectangular structure, with the chain mesh fixed to the outer wall of the rectangular structure; it also includes pressure chains, which are distributed crosswise on the top of the two rows of fixed piles; and a barrier is provided between the two fixed piles at both ends of the rectangular structure.

[0010] Preferably, the pile chain cofferdam is provided in four sets, with two sets of pile chain cofferdams placed horizontally parallel to each other and two sets of pile chain cofferdams placed vertically parallel to each other.

[0011] Furthermore, a first stabilizing bar is provided at the bottom of the outer perimeter guardrail, and a second stabilizing bar is provided at the bottom of the inner perimeter guardrail.

[0012] Furthermore, both the outer and inner perimeter fencing have a wave-like structure.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0014] This utility model is equipped with a fence and a pile chain cofferdam. The pile chain cofferdam includes fixed piles and a chain net. The chain net can effectively block the loss of silt and other materials, reducing the impact on the surrounding environment. The closure section is generally set downstream. The water flow after being screened by the chain net is not mixed with silt. After the pile chain cofferdam is installed, the difficulty of closure is reduced when filling the last part of the fence. Attached Figure Description

[0015] Figure 1 is a perspective view of this utility model.

[0016] Figure 2 is a bottom view of this utility model.

[0017] Figure 3 shows the structure of the fence after it has been flipped over.

[0018] Figure 4 is a three-dimensional view of the pile chain cofferdam.

[0019] The labels in the diagram are as follows: 1-Outer perimeter fence, 2-First stabilizing bar, 3-Inner perimeter fence, 4-Second stabilizing bar, 5-Positioning post, 6-Fixing post, 7-Chain net, 8-Pressure chain, 9-Barrier bar. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, so as to provide a better understanding of the concept of the present utility model, the technical problem solved, the technical features constituting the technical solution and the technical effects brought about.

[0021] As shown in Figures 1-3, a cofferdam designed for easy closure includes a fence and a pile-chain cofferdam. The pile-chain cofferdam includes fixed piles 6 and a chain net 7. The fixed piles 6 are fixed to the riverbed, and the chain net 7 is installed on the fixed piles, providing protection against water flow from multiple directions. The fence is installed outside the pile-chain cofferdam and is mounted on the riverbed via positioning piles. The fence performs the function of blocking water flow and isolating the construction area from the external water body, as is the case with conventional cofferdams. The purpose of the pile-chain cofferdam is that the chain net 7 forms a continuous protective surface, protecting against water flow from multiple directions, preventing silt and debris carried by the water flow from entering the construction area, and preventing silt from flowing out of the construction area. Simultaneously, its flexible structure disperses the impact force of the water flow. After the pile-chain cofferdam is installed, the water flow within the construction area and downstream of the construction area is free of silt and debris, protecting the construction area inside the pile-chain cofferdam and facilitating the closure of the fence. Closure refers to the construction of a structure that begins at both ends and joins at the middle. However, with existing fences, the presence of silt and debris in the water flow leads to significant scouring force on the cofferdam, making closure difficult. This invention incorporates a pile chain cofferdam within the fence. During installation and subsequent closure, the water flow is filtered by the pile chain cofferdam, reducing scouring force and lowering the difficulty of closure. Secondly, this invention uses a fence, while existing technologies often use concrete or earth and stone. Because precise connections are required during closure, improper handling can easily create weak points. Under water pressure and other external forces, this can lead to cracks, leaks, or even damage in the closure section, significantly impacting the efficiency and quality of the closure construction. This invention uses a fence, which can be made of metal plates or other sufficiently strong components. The connection during closure is between metal plates, reducing the likelihood of weak points in the closure section. This results in higher installation efficiency and quality, and easier dismantling.

[0022] Furthermore, the fence includes an outer perimeter fence 1 and an inner perimeter fence 3, with a gap between the outer perimeter fence 1 and the inner perimeter fence 3, within which a positioning post 5 is installed. The outer perimeter fence 1 and the inner perimeter fence 3 form a double-layered support. The gap between the outer perimeter fence 1 and the inner perimeter fence 3 allows for independent support; damage to either the outer perimeter fence 1 or the inner perimeter fence 3 will not immediately affect the water flow blocking effect. In practical work, based on the specific project plan and actual site conditions, the placement position of the chain-link cofferdam is precisely determined, and the outer perimeter fence 1 and the inner perimeter fence 3 together construct a relatively stable frame structure. The gap between the outer perimeter fence 1 and the inner perimeter fence 3, with the positioning post 5 installed within the gap, facilitates precise positioning and layout by construction personnel based on the construction site and plan, allowing for the installation of the outer perimeter fence 1 and the inner perimeter fence 3 only after the orientation is determined.

[0023] As shown in Figure 4, the pile chain cofferdam further includes two rows of evenly distributed fixed piles 6, forming a rectangular structure. A chain mesh 7 is fixed to the outer wall of the rectangular structure. It also includes pressure chains 8, which are intersectingly distributed at the top of the two rows of fixed piles 6. Barrier strips 9 are installed between the two fixed piles 6 at both ends of the rectangular structure. The barrier strips 9 serve the same function as the chain mesh 7. Since installing only one side of the chain mesh 7 facilitates installation and disassembly, barrier strips 9 are installed at both ends of the rectangular structure formed by the two rows of fixed piles 6 to achieve the effect of blocking silt. The spacing between the fixed piles is preferably 1.5m, and the diameter of the fixed piles 6 is 10cm, forming a continuous protective surface. The 1.5m spacing between the fixed piles 6 creates a reasonable force-bearing system, allowing each pile to work collaboratively and evenly distribute the load when subjected to external forces, avoiding localized stress concentration. Simultaneously, the 10cm diameter ensures that the fixed piles 6 have sufficient support to bear various external forces on the cofferdam, such as water flow impact and earth pressure, when inserted into the riverbed or foundation.

[0024] First, a chain-linked cofferdam is inserted into the riverbed, and then filling is carried out. This facilitates the cofferdam closure and makes the closure less susceptible to erosion at the closure point, reducing the difficulty of closure. The spacing and arrangement of the fixed piles 6 are reasonably designed to ensure the structural stability of the closure section and improve the quality and reliability of the closure.

[0025] Preferably, four sets of pile chain cofferdams are provided, with two sets placed horizontally parallel and two sets placed vertically parallel. Providing four sets of pile chain cofferdams can protect against water flow from multiple directions, preventing mud, sand, and debris carried by the water from entering the construction area.

[0026] Furthermore, a first stabilizing rod 2 is provided at the bottom of the outer perimeter guardrail 1, and a second stabilizing rod 4 is provided at the bottom of the inner perimeter guardrail 3. The first stabilizing rod 2 and the second stabilizing rod 4 are inserted into the riverbed to prevent the outer perimeter guardrail 1 and the inner perimeter guardrail 3 from shifting or tilting.

[0027] Furthermore, both the outer perimeter guardrail 1 and the inner perimeter guardrail 3 are wave-shaped structures. The impact of water flow is strong, and the wave-shaped outer perimeter guardrail 1 and inner perimeter guardrail 3 offer greater strength.

[0028] Preferably, the chain mesh 7 is made of galvanized steel wire. The galvanized steel wire chain mesh 7 can effectively block the mud, sand and debris carried by the water flow, protecting the construction area inside the cofferdam. At the same time, its good processing performance can be cut and bent according to actual needs, making it easy to fix and connect with metal piles in different locations. After the cofferdam has completed its mission, the galvanized steel wire chain mesh 7 can be recycled and reused as a metal material.

[0029] The terms "connection" and "fixing" appearing in this utility model description can refer to fixed connection, processing and forming, welding, or mechanical connection. The specific meaning of the above terms in this utility model should be understood according to the specific circumstances.

[0030] In the description of this utility model, the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc., are used only to indicate the orientation or positional relationship for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cofferdam that facilitates closure, characterized in that: It includes a fence and a pile chain cofferdam; the pile chain cofferdam includes fixed piles (6) and a chain net (7), the fixed piles (6) are fixed to the riverbed, the chain net (7) is set on the fixed piles, and the chain net (7) protects the water flow in multiple directions; the fence is set outside the pile chain cofferdam, and the fence is installed on the riverbed by positioning piles.

2. The cofferdam for easy closure according to claim 1, characterized in that: The fence includes an outer perimeter fence (1) and an inner perimeter fence (3), with a gap between the outer perimeter fence (1) and the inner perimeter fence (3), and a positioning post (5) is installed in the gap.

3. The cofferdam for easy closure according to claim 1, characterized in that: The pile chain cofferdam includes two rows of evenly distributed fixed piles (6), which form a rectangular structure. The chain net (7) is fixed to the outer wall of the rectangular structure. It also includes pressure chains (8), which are distributed crosswise on the top of the two rows of fixed piles (6). A barrier (9) is provided between the two fixed piles (6) at both ends of the rectangular structure.

4. The cofferdam for easy closure according to claim 1, characterized in that: The pile chain cofferdam consists of four sets, with two sets placed horizontally parallel and two sets placed vertically parallel.

5. A cofferdam for easy closure according to claim 2, characterized in that: The outer perimeter fence (1) is provided with a first stabilizing bar (2) at the bottom, and the inner perimeter fence (3) is provided with a second stabilizing bar (4) at the bottom.

6. A cofferdam for easy closure according to claim 2, characterized in that: Both the outer perimeter fence (1) and the inner perimeter fence (3) are wave-shaped structures.

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