Earth-rock cofferdam that serves as both a seepage monitoring and construction water storage facility
By installing plastic drainage belts and drainage ditches inside the earth-rock cofferdam, the problem of incomplete cofferdam seepage monitoring was solved, enabling comprehensive seepage monitoring and storage of construction water, thus improving safety and construction reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-26
AI Technical Summary
In existing civil engineering projects, the monitoring of seepage in cofferdams is not comprehensive, which means that seepage flow meters cannot cover all monitoring points. This can lead to situations where there is a sudden increase in seepage but no abnormal data, which may cause safety accidents.
Plastic drainage belts and drainage ditches are installed inside the earth-rock cofferdam. The plastic drainage belts are divided into vertical, steeply inclined, and gently inclined sections to collect seepage water and monitor the flow rate through the drainage ditches. Gates are set up to store seepage water for construction water use.
It enables comprehensive monitoring of seepage in cofferdams and storage of construction water, preventing safety accidents and improving the coverage of seepage monitoring and the reliability of construction water.
Smart Images
Figure CN224281330U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an earth-rock cofferdam that combines seepage observation and construction water storage. It is applicable to the field of civil engineering technology. Background Technology
[0002] Construction diversion is a crucial technology in water conservancy and hydropower engineering. Currently, pumped storage power stations and reservoirs are under construction in China, with cofferdams typically ranging from 5 to 20 meters in height. During construction, it is essential to monitor seepage through these cofferdams, as excessive seepage can lead to safety incidents such as piping and dam failure. While flow meters are usually embedded within the cofferdam to monitor seepage, the large span of the cofferdam often prevents complete coverage of monitoring points, resulting in situations where seepage increases sharply without any abnormal data from the flow meters. Utility Model Content
[0003] The technical problem to be solved by this utility model is: to provide an earth-rock cofferdam that combines seepage observation and construction water storage, in view of the above-mentioned problems.
[0004] The technical solution adopted in this utility model is: an earth-rock cofferdam that combines seepage observation and construction water storage, comprising:
[0005] Earth-rock cofferdam body;
[0006] A number of plastic drainage belts are evenly distributed within the earth-rock cofferdam. The first end of the plastic drainage belt extends into the foundation below the earth-rock cofferdam, and the second end of the plastic drainage belt extends out of the downstream slope of the earth-rock cofferdam.
[0007] A drainage ditch is set at the downstream toe of the earth-rock cofferdam, below the second end of the plastic drainage belt, and is equipped with a measuring weir and a gate.
[0008] The plastic drainage strip includes a vertical section, a steeply inclined section, and a gently inclined section;
[0009] The vertical section is vertically installed in the foundation below the earth-rock cofferdam body. The upper end of the vertical section is connected to the steeply inclined section, which gradually slopes downstream from bottom to top. The upper end of the steeply inclined section is located in the middle of the earth-rock cofferdam body and is connected to the gently inclined section, which gradually slopes downward from upstream to downstream.
[0010] The connection between the steep and gentle slope sections is determined based on the seepage curve simulated by the earth-rock cofferdam model.
[0011] Shotcrete cladding is installed on the downstream slope of the earth-rock cofferdam body, within the area from the toe of the cofferdam to the plastic drainage strip.
[0012] The second end of the plastic drainage belt extends 10-20cm beyond the downstream slope of the earth-rock cofferdam.
[0013] The plastic drainage strip was replaced with a drainage pipe wrapped with sponge.
[0014] The beneficial effects of this utility model are as follows: This utility model collects the water flowing inside the cofferdam by using several plastic drainage belts evenly distributed within the cofferdam body. The water is discharged through the second end of the plastic drainage belts and collected by a drainage ditch. The drainage ditch is connected to a measuring weir for monitoring the seepage flow rate, and a gate is set up to store the seepage water of the cofferdam as reserve water for construction. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of an embodiment.
[0016] 1. Earth-rock cofferdam body; 2. Plastic drainage board; 3. Shotcrete facing; 4. Drainage ditch; 5. Anti-seepage inclined wall. Detailed Implementation
[0017] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0018] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0019] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0020] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.
[0021] Example 1: As Figure 1 As shown in the figure, this embodiment is an earth-rock cofferdam that combines seepage observation and construction water storage, including an earth-rock cofferdam body, plastic drainage belts, and drainage ditches.
[0022] In this example, several plastic drainage strips are evenly distributed within the earth-rock cofferdam. The first end of the plastic drainage strip extends into the foundation below the earth-rock cofferdam, and the second end extends 10-20cm beyond the downstream slope of the earth-rock cofferdam.
[0023] In this embodiment, the plastic drainage belt is divided into sections, which are vertical, steeply inclined and gently inclined from the first end to the second end. The vertical section is vertically installed in the foundation below the earth-rock cofferdam body. The upper end of the vertical section is connected to the steeply inclined section. The steeply inclined section gradually slopes downstream from bottom to top. The upper end of the steeply inclined section is located in the middle of the earth-rock cofferdam body and is connected to the gently inclined section. The gently inclined section gradually slopes downward from upstream to downstream.
[0024] In this embodiment, the junction between the steeply inclined section and the gently inclined section is located on or slightly above the seepage curve simulated by the earth-rock cofferdam model.
[0025] In this example, a drainage ditch is set up at the downstream toe of the earth-rock cofferdam. The drainage ditch is located below the second end of the plastic drainage belt and is used to receive the water discharged from the drainage belt. The drainage ditch is connected to a measuring weir and a simple gate is set up. The measuring weir is used to monitor the seepage flow. When the gate is closed, the seepage water of the cofferdam can be stored as reserve water for construction.
[0026] In this example, shotcrete is installed on the downstream slope of the earth-rock cofferdam, within the area from the toe of the dam to the plastic drainage strip.
[0027] Example 2: This example is basically the same as Example 1, except that a drainage pipe with an outer sponge is used instead of the plastic drainage strip in Example 1.
[0028] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A soil and rock cofferdam with water seepage observation and construction water storage, characterized in that, include: Earth-rock cofferdam body; A number of plastic drainage belts are evenly distributed within the earth-rock cofferdam. The first end of the plastic drainage belt extends into the foundation below the earth-rock cofferdam, and the second end of the plastic drainage belt extends out of the downstream slope of the earth-rock cofferdam. A drainage ditch is set at the downstream toe of the earth-rock cofferdam, below the second end of the plastic drainage belt, and is equipped with a measuring weir and a gate.
2. The soil and rock cofferdam with water infiltration observation and construction water storage function according to claim 1, characterized in that: The plastic drainage strip includes a vertical section, a steeply inclined section, and a gently inclined section; The vertical section is vertically installed in the foundation below the earth-rock cofferdam body. The upper end of the vertical section is connected to the steeply inclined section, which gradually slopes downstream from bottom to top. The upper end of the steeply inclined section is located in the middle of the earth-rock cofferdam body and is connected to the gently inclined section, which gradually slopes downward from upstream to downstream.
3. The earth-rock cofferdam that combines seepage observation and construction water storage according to claim 1, characterized in that: The connection between the steep and gentle slope sections is determined based on the seepage curve simulated by the earth-rock cofferdam model.
4. The earth-rock cofferdam that combines seepage observation and construction water storage according to claim 1, characterized in that: Shotcrete cladding is installed on the downstream slope of the earth-rock cofferdam body, within the area from the toe of the cofferdam to the plastic drainage strip.
5. The earth-rock cofferdam that combines seepage observation and construction water storage according to claim 1, characterized in that: The second end of the plastic drainage belt extends 10-20cm beyond the downstream slope of the earth-rock cofferdam.
6. The earth-rock cofferdam that combines seepage observation and construction water storage according to claim 1, characterized in that: The plastic drainage strip was replaced with a drainage pipe wrapped with sponge.