Soilless cofferdam
By using soilless cofferdam structures and employing isolation frames and waterproof membranes to isolate the construction area, the problems of complex construction and water pollution associated with existing cofferdam structures are solved, achieving low-cost and pollution-free construction results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN PIPELINE ENG GROUP
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-21
AI Technical Summary
Existing cofferdam structures, such as Larsen pile cofferdams and earth cofferdams, have problems such as high construction technology requirements, high costs, or easy pollution of water sources.
The soilless cofferdam structure is adopted, including an isolation frame and a waterproof membrane. The isolation frame is composed of right-angled triangular supports, and the waterproof membrane is made of waterproof geotextile. It is fixed to the river channel and bank slope by connecting rods and fixing methods to form an isolated construction area.
It achieves convenient, low-cost, and pollution-free construction, and is suitable for construction needs in rivers and shallow water areas.
Smart Images
Figure CN224531713U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cofferdam construction technology, and in particular relates to a soilless cofferdam. Background Technology
[0002] Currently, common cofferdam structures include Larssen pile cofferdams and earth cofferdams. Larssen pile cofferdams require concrete to be poured into the piles, which has high requirements for construction technology and high construction costs. Earth cofferdam structures require filling the space between two steel plates with sand. Although this type of cofferdam structure has low construction costs, it is prone to water pollution, and subsequent targeted decontamination of the water is required, which brings inconvenience to production. Utility Model Content
[0003] In view of this, the present invention aims to propose a soilless cofferdam to improve the ease of cofferdam construction, reduce construction costs, and reduce environmental pollution caused by construction.
[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0005] A soilless cofferdam includes an isolation frame arranged along the edge of the construction area in the river channel. The two ends of the isolation frame extend to the bank slope of the river channel. The water-facing surface of the isolation frame is sloping and covered with a waterproof membrane. The waterproof membrane and the bank slope enclose and form a cofferdam structure that separates the construction area from the river channel.
[0006] Furthermore, the isolation frame is a scaffolding structure, including several right-angled triangular supports arranged sequentially along the edge of the construction area. Each right-angled triangular support includes horizontal bars, vertical bars, and diagonal bars connected by fasteners. The horizontal bars and vertical bars are the two right-angled sides of the right-angled triangle, and the horizontal bars are set close to the bottom of the water. The diagonal bars are the hypotenuses of the right-angled triangle and are set facing the water. The diagonal bars of the several right-angled triangular supports enclose the water-facing surface of the isolation frame.
[0007] Along the edge of the construction area, the diagonal rods of several right-angled triangular supports are connected by connecting rods.
[0008] Furthermore, several diagonal bracing rods are provided between the horizontal bar and the diagonal bar.
[0009] Furthermore, sandbags are used along the edge of the construction area to press and fix the bottom of the waterproof membrane to the riverbed, pressure bars are used to press and fix the waterproof membrane to the water-facing side of the isolation frame, or ropes are used to fasten and fix the top of the waterproof membrane to the isolation frame.
[0010] Furthermore, the waterproof membrane is a waterproof geotextile.
[0011] Furthermore, a striped tarpaulin layer is laid on the water-facing side of the waterproof membrane.
[0012] Compared with existing technologies, the soilless cofferdam described in this utility model has the following advantages:
[0013] (1) In this utility model, a soilless cofferdam structure is used to isolate the construction area from other areas of the river. Compared with soil cofferdam and Larsen pile cofferdam structure, soilless cofferdam structure is simple and easy to construct. Moreover, this construction will not pollute the water source and is suitable for construction in isolated areas in rivers or waters with shallow water levels.
[0014] (2) In this utility model, the isolation frame that constitutes the soilless cofferdam support is a scaffold structure, and can be adapted to the shape and size of the construction cofferdam. The entire device can be reused, which improves the convenience of construction and reduces the construction cost. Attached Figure Description
[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0016] Figure 1 This is a schematic diagram of a soilless cofferdam as described in this embodiment, viewed from above the bank slope;
[0017] Figure 2 This is a schematic diagram of a soilless cofferdam as described in this embodiment, viewed from within the river channel.
[0018] Figure 3 This is a schematic diagram of the right-angled triangular support structure in this embodiment;
[0019] Figure 4 A top view showing the arrangement of right-angled triangular supports at the bend of the soilless cofferdam.
[0020] Explanation of reference numerals in the attached figures:
[0021] 1-River channel; 2-Construction area; 3-Waterproof membrane; 4-Bank slope; 5-Right-angled triangular support; 51-Diagonal brace; 52-Upright pole; 53-Horizontal bar; 54-Diagonal brace; 6-Sandbag; 7-Connecting rod; 8-Isolation frame; 81-Corner. Detailed Implementation
[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0026] like Figure 1 , Figure 2 As shown, a soilless cofferdam includes an isolation frame 8 arranged along the edge of the construction area 2 within a river channel 1. The isolation frame 8 extends at both ends to the bank slope 4 corresponding to the construction area 2 within the river channel 1. The water-facing side of the isolation frame 8 (the side of the cofferdam facing the water flow in the river channel) is sloping and covered with a waterproof membrane 3, with the high end of the waterproof membrane 3 extending above the river water surface. The waterproof membrane 3 is preferably a waterproof geotextile. During construction, to improve the isolation effect of the waterproof membrane 3 and prevent damage, a woven fabric layer can be placed between the waterproof membrane 3 and the water-facing side of the isolation frame 8, and a striped fabric layer can be placed on the water-facing side of the waterproof membrane 3 (the side of the waterproof membrane in contact with the water flow in the river channel). The waterproof membrane 3 also extends at both ends to the bank slope 4. The waterproof membrane 3 and the bank slope 4 enclose and form a cofferdam structure that separates the construction area 2 from the river water area, facilitating targeted construction work by personnel within the construction area.
[0027] Specifically, the isolation frame 8 is a scaffolding structure, comprising several right-angled triangular supports 5 arranged sequentially along the edge of the construction area 2. The structure of the right-angled triangular supports 5 is as follows: Figure 3As shown, it includes a horizontal bar 53, an upright bar 52, and a diagonal bar 51. The horizontal bar 53, upright bar 52, and diagonal bar 51 are sequentially connected by scaffolding fixing fasteners to form a right-angled triangular support structure. The horizontal bar 53 and upright bar 52 are the two right-angled sides of the right-angled triangle, and the horizontal bar 53 is close to the bottom of the river channel 1. The diagonal bar 51 is the hypotenuse of the right-angled triangle and is oriented towards the water flow in the river channel. The diagonal bars 51 of the several right-angled triangular supports 5 together form the water-facing surface of the isolation frame 8, and the waterproof membrane 3 is laid on the water-facing surface. In this utility model, several diagonal bracing rods 54 are set between the horizontal bar 53 and the diagonal bar 51 to support the diagonal bar 51, thereby improving the support strength of the water-facing side of the right-angled triangular support 5 and ensuring the support stability of the right-angled triangular support 5.
[0028] To further improve the stability of the isolation frame 8, connecting rods 7 are used to connect the diagonal bars 51 of several right-angled triangular supports 5 along the edge of the construction area 2, thereby connecting several right-angled triangular supports 5 into a whole, improving the stability of the cofferdam structure and ensuring construction safety.
[0029] In this utility model, the right-angled triangular support 5 at the corner 81 of the soilless cofferdam corresponding to the isolation frame 8 is arranged as follows: Figure 4 As shown, the right-angled triangular bracket 5 at this position is arranged with a corresponding corner 81 shape. Similarly, the connecting rod 7 is used to connect the right-angled triangular bracket 5 at this position to ensure the stability of the isolation frame 8 at its corner 81 position.
[0030] In this utility model, the waterproof membrane 3 is fixed by the following structure: sandbags 6 are used to press the bottom end of the waterproof membrane 3 tightly to the bottom of the river channel 1 along the edge of the construction area 2; pressure rods (parallel to the diagonal rod 51, not shown in the figure, the pressure rods are connected and fixed to the isolation frame 8) are used to press the waterproof membrane 3 tightly to the water-facing side of the isolation frame 8; or ropes are used to tie the top end of the waterproof membrane 3 to the isolation frame.
[0031] The wastewater cofferdam structure described in this utility model is simple, easy to construct, and reusable, which reduces production costs. The cofferdam construction is a pollution-free construction method, which improves the ease of construction.
[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A soilless cofferdam, characterized in that: The structure includes an isolation frame (8) arranged along the edge of the construction area (2) within the river channel (1). The isolation frame (8) extends to the bank slope (4) of the river channel (1) at both ends. The water-facing surface of the isolation frame (8) is a slope and is covered with a waterproof membrane (3). The waterproof membrane (3) and the bank slope (4) enclose and form a cofferdam structure that separates the construction area (2) from the river channel.
2. The soilless cofferdam according to claim 1, characterized in that: The isolation frame (8) is a scaffold structure, including several right-angled triangular supports (5) arranged sequentially along the edge of the construction area (2). The right-angled triangular supports (5) include horizontal bars (53), vertical bars (52) and diagonal bars (51) connected by fasteners. The horizontal bars (53) and vertical bars (52) are the two right-angled sides of the right-angled triangle, and the horizontal bars (53) are set close to the bottom of the water. The diagonal bars (51) are the hypotenuse of the right-angled triangle, and the diagonal bars (51) are set facing the water. The diagonal bars (51) of the several right-angled triangular supports (5) enclose the water-facing surface of the isolation frame (8). Along the edge of the construction area (2), the diagonal rods (51) of several right-angled triangular supports (5) are connected by connecting rods (7).
3. The soilless cofferdam according to claim 2, characterized in that: Several diagonal bracing rods (54) are provided between the horizontal bar (53) and the diagonal bar (51).
4. The soilless cofferdam according to claim 1, characterized in that: Use sandbags (6) along the edge of the construction area (2) to press the bottom of the waterproof membrane (3) tightly to the bottom of the river (1), use pressure bars to press the waterproof membrane (3) tightly to the water-facing side of the isolation frame (8), or use ropes to tie the top of the waterproof membrane (3) to the isolation frame.
5. A soilless cofferdam according to claim 1, characterized in that: The waterproof membrane (3) is a waterproof geotextile.
6. The soilless cofferdam according to claim 1, characterized in that: The waterproof membrane (3) has a layer of colored tarpaulin laid on the water-facing side.