Concrete cofferdam with functions of retaining wall and measuring weir
By combining concrete cofferdams, anti-seepage walls on both banks, and water measuring weirs to form a closed anti-seepage system, the problems of space constraints and high investment caused by the independent setting of cofferdams, water measuring weirs, and retaining walls downstream of rockfill dams are solved. This achieves the functions of flood control during construction and seepage measurement during permanent construction, thereby reducing project costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2026-04-03
AI Technical Summary
In existing technologies, the downstream cofferdam, the downstream weir, and the downstream retaining wall of the rockfill dam are set up independently, resulting in a compact layout of structures and high project investment.
Design a concrete cofferdam that combines the functions of a retaining wall and a measuring weir. By combining the permanent structures of the retaining wall and measuring weir behind the dam with the temporary concrete cofferdam, an integrated structure is formed, including the concrete cofferdam, the seepage prevention walls on both banks, the measuring weir, and the temporary water-retaining steel plate, which together form a closed seepage prevention system.
It optimizes the spatial layout of buildings, reduces project investment, improves reliability, and realizes the functions of flood control during construction and permanent seepage measurement, which has broad guiding significance and promotional value.
Smart Images
Figure CN224078216U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water conservancy and hydropower engineering technology, specifically to a concrete cofferdam that combines the functions of a retaining wall and a measuring weir. Background Technology
[0002] During the construction phase, a downstream cofferdam is typically installed behind the rockfill dam to block floods during construction. In the permanent operational phase after construction, a retaining wall is required behind the dam to maintain slope stability, and a measuring weir is installed to measure seepage. In existing technologies, most rockfill dams have their downstream cofferdam, measuring weir, and retaining wall installed independently, resulting in a compact structure layout and high project investment. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides a concrete cofferdam that combines the functions of a retaining wall and a water measuring weir, effectively solving the aforementioned problems.
[0004] The technical solution adopted in this utility model is as follows:
[0005] This utility model provides a concrete cofferdam that combines the functions of a retaining wall and a measuring weir, including a concrete cofferdam, anti-seepage walls on both banks, a measuring weir, and a temporary water-retaining steel plate.
[0006] The concrete cofferdam is set at the toe of the slope of the dam back slope, and the anti-seepage walls on both sides of the concrete cofferdam are set; the concrete cofferdam and the anti-seepage walls on both sides together form a closed anti-seepage system; the water measuring weir is set at the top of the concrete cofferdam, and the temporary water-retaining steel plate is set in the weir groove of the water measuring weir.
[0007] Preferably, the foundation of the concrete cofferdam is excavated down to a relatively impermeable layer of bedrock.
[0008] Preferably, the seepage-proof walls on both banks overlap with the concrete cofferdam body, and the lower part extends into the relatively impermeable layer of bedrock.
[0009] Preferably, the length of the measuring weir is longer than the width of the top of the concrete cofferdam, and the portion of the measuring weir extending out of the top of the cofferdam is supported by a concrete support structure poured at the bottom.
[0010] Preferably, the temporary water-retaining steel plate is embedded in the weir groove of the measuring weir on both sides and at the bottom, and its top is flush with the top of the concrete cofferdam.
[0011] Preferably, the drainage mattress of the slope behind the dam is connected to the front side of the measuring weir.
[0012] The concrete cofferdam that combines the functions of a retaining wall and a measuring weir provided by this utility model has the following advantages:
[0013] By combining permanent structures such as the retaining wall and measuring weir behind the dam with temporary structures such as the concrete cofferdam, the spatial layout of the structures is optimized, the project investment is reduced, and the project is simple, convenient, and highly reliable. It has broad guiding and promotional significance. Attached Figure Description
[0014] Figure 1 This is a plan view of the concrete cofferdam that combines the functions of a retaining wall and a measuring weir provided by this utility model.
[0015] Figure 2 This is a cross-sectional schematic diagram of a concrete cofferdam that combines the functions of a retaining wall and a water measuring weir, provided by this utility model.
[0016] Among them: 1---concrete cofferdam; 2---seepage prevention walls on both banks; 3---water measuring weir; 4---temporary water-retaining steel plate; 5---drainage mattress; 6---slope protection behind the dam; 7---water measuring weir support structure. Detailed Implementation
[0017] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0018] See Figure 1 and Figure 2 This utility model provides a concrete cofferdam that combines the functions of a retaining wall and a measuring weir, including a concrete cofferdam 1, anti-seepage walls on both banks 2, a measuring weir 3, and a temporary water-retaining steel plate 4.
[0019] The concrete cofferdam 1 is set at the toe of the slope of the downstream slope 6 of the dam. The foundation of the concrete cofferdam 1 is excavated to the relatively impermeable layer of bedrock. During the construction period, it is used as a downstream cofferdam of the dam foundation pit to block floods during the construction period. During the permanent operation period, it is used as a retaining wall for the downstream slope of the dam and a seepage prevention wall for the water measuring weir.
[0020] The two sides of the concrete cofferdam 1 are provided with the anti-seepage walls 2; the anti-seepage walls 2 overlap with the cofferdam body of the concrete cofferdam 1, and the lower part extends into the relatively impermeable layer of bedrock.
[0021] The concrete cofferdam 1 and the two bank anti-seepage walls 2 together form a closed anti-seepage system; thus, it can block downstream floods during the construction period and be used as a water measuring weir anti-seepage wall during the permanent operation period.
[0022] The measuring weir 3 is installed at the top of the concrete cofferdam 1. The measuring weir 3 is arranged in conjunction with the concrete cofferdam 1, and the arrangement can be such that the drainage mat 5 of the downstream slope 6 is connected to the front side of the measuring weir 3. The length of the measuring weir 3 is longer than the width of the top of the concrete cofferdam 1, and the suspended portion of the measuring weir 3 extending beyond the top of the cofferdam is supported by a concrete support structure 7 cast at the bottom. During permanent operation, the concrete cofferdam 1 and the anti-seepage walls 2 on both banks together form a closed anti-seepage system, allowing dam seepage water to pass through the measuring weir 3 to measure the dam seepage.
[0023] The temporary water-retaining steel plate 4 is installed inside the weir channel of the measuring weir 3. During the construction period, it is used to block downstream floods and protect the weir plate of the measuring weir 3. Specifically, the temporary water-retaining steel plate 4 is embedded in the weir channel of the measuring weir 3 on both sides and at the bottom, and its top is flush with the top of the concrete cofferdam 1.
[0024] This utility model provides a concrete cofferdam that combines the functions of a retaining wall and a measuring weir. It integrates a permanent structure—a retaining wall and a measuring weir downstream of the dam—with a temporary concrete cofferdam to form a unified structure. Through this combination of permanent and temporary functions, it serves as a concrete cofferdam during construction to block downstream floods; during permanent operation, it functions as both a retaining wall and a measuring weir to prevent seepage, thus providing the function of a measuring weir for measuring dam seepage. Therefore, this application is simple, convenient, and highly reliable. Since it eliminates the need for separate downstream cofferdams, measuring weirs, and retaining walls downstream of the rockfill dam, it reduces project investment.
[0025] The following is an example:
[0026] This embodiment provides a concrete cofferdam that combines the functions of a retaining wall and a measuring weir, including a concrete cofferdam 1, two anti-seepage walls 2 on both banks, a measuring weir 3, and a temporary water-retaining steel plate 4.
[0027] The concrete cofferdam 1 is located at the toe of slope 6 behind the dam, with its axis nearly perpendicular to the river channel. The foundation of the cofferdam is excavated to the relatively impermeable layer of bedrock. The elevation of the cofferdam crest is determined by comprehensively considering the water-blocking requirements during construction, the water-measuring weir operation requirements during operation, and the soil-retaining requirements of the slope behind the dam. The maximum height of the cofferdam is about 10m.
[0028] The two-sided seepage barrier walls 2 are located on the shoulders of the concrete cofferdam 1, overlapping with the cofferdam body, and extending into the relatively impermeable layer of bedrock. The axis of the two-sided seepage barrier walls 2 is selected comprehensively based on geological and construction conditions, and together with the concrete cofferdam 1, they form a closed seepage prevention system.
[0029] The measuring weir 3 is located in the center of the original river channel and is positioned on top of the concrete cofferdam 1. A concrete measuring weir structure is reserved on top of the concrete cofferdam 1. The measuring weir concrete structure is approximately 4m long and 2m wide. The drainage mattress 5 of the dam and the slope dam behind the dam extends to the front of the measuring weir 3. Since the length of the measuring weir 3 is generally longer than the width of the top of the concrete cofferdam 1, a concrete support structure 7 is poured for the suspended part of the measuring weir 3 extending above the top of the cofferdam. During the permanent operation period, the concrete cofferdam 1 and the anti-seepage walls 2 on both banks together form a closed anti-seepage system, allowing the dam seepage water to pass through the measuring weir 3 and measuring the dam seepage.
[0030] The temporary water-retaining steel plate 4 is arranged in the weir groove of the measuring weir 3, downstream of the weir plate of the measuring weir 3. The temporary water-retaining steel plate 4 is about 30mm thick and is made of stainless steel. It is embedded 10cm into the weir groove of the measuring weir 3 on both sides and bottom. The top is flush with the top of the concrete cofferdam 1. During the construction period, it is used to block downstream floods and protect the weir plate of the measuring weir 3.
[0031] This utility model provides a concrete cofferdam that combines the functions of a retaining wall and a measuring weir, which has the following advantages: by combining the permanent structures of the retaining wall and measuring weir behind the dam with the temporary concrete cofferdam, the spatial layout of the structures is optimized and the project investment is reduced through this combination of permanent and temporary structures. It is simple, convenient, and highly reliable, and has broad guiding and promotional significance.
[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A concrete cofferdam with the functions of retaining wall and water measuring weir, characterized in that, The concrete cofferdam (1), the diaphragm wall (2) on both sides of the cofferdam, the measuring weir (3) and the temporary steel plate (4) for retaining water. The concrete cofferdam (1) is arranged at the toe of the downstream pressure slope (6), and the diaphragm wall (2) is arranged on both sides of the cofferdam (1); the concrete cofferdam (1) and the diaphragm wall (2) form a closed impermeable system; the measuring weir (3) is arranged on the top of the concrete cofferdam (1), and the temporary steel plate (4) for retaining water is arranged in the weir groove of the measuring weir (3).
2. The concrete cofferdam with the functions of retaining wall and water measuring weir according to claim 1, characterized in that, The foundation of the concrete cofferdam (1) is excavated to the relatively water-impermeable layer of the bedrock.
3. The concrete cofferdam with the functions of retaining wall and water measuring weir according to claim 1, characterized in that, The diaphragm wall (2) is overlapped with the cofferdam body of the concrete cofferdam (1) and is deeply arranged in the relatively water-impermeable layer of the bedrock.
4. The concrete cofferdam with the functions of retaining wall and water measuring weir according to claim 1, characterized in that, The length of the measuring weir (3) is longer than the width of the top of the concrete cofferdam (1), and the overhanging part of the measuring weir (3) is supported by the concrete support structure (7) poured at the bottom.
5. The concrete cofferdam with the functions of retaining wall and water measuring weir according to claim 1, characterized in that, The temporary steel plate (4) for retaining water is embedded in the weir groove of the measuring weir (3) on both sides and at the bottom, and is flush with the top of the concrete cofferdam (1) at the top.
6. The concrete cofferdam with the functions of retaining wall and water measuring weir according to claim 1, characterized in that, The drainage cushion (5) of the downstream pressure slope (6) is connected to the front side of the measuring weir (3).