A structure for preventing cracking and water leakage in the dam section of a concrete dam bank slope

Abstract

The invention discloses a structure for preventing cracking and water leakage of a bank slope section of a concrete dam, comprising a bank slope section dam body, bank slope bedrock, bank slope slope bedrock surface, and bank slope bedrock plane, wherein a first row of semicircular permeable pipes and a second row of semicircular permeable pipes are arranged inside the bank slope section dam body and on the bank slope slope bedrock surface, clay is filled inside the first row of semicircular permeable pipes and the second row of semicircular permeable pipes, a semicircular permeable drainage pipe in the direction of the slope is arranged inside the bank slope section dam body and on the bank slope slope bedrock surface, a semicircular permeable drainage pipe in the direction of the water flow is arranged inside the bank slope section dam body and on the bank slope bedrock plane, and a permeable geotextile is wrapped around the semicircular permeable drainage pipe in the direction of the slope and the semicircular permeable drainage pipe in the direction of the water flow. The structure effectively prevents water leakage from the dam body when the bank slope dam body shrinks and cracks are generated in the rock foundation through clay backfilled in the semicircular permeable pipe, and is convenient to construct, requires little investment, and has good effects.

Description

Technical Field

[0001] The invention relates to a structure for preventing concrete dam bank slope section from cracking and leaking water. Background Art

[0002] The bank slope section of the concrete gravity dam is a rock slope, so a steeper slope, such as 1:0.3, is often used during construction and excavation. The second reason is that the slope height is often higher due to the steepness of the bank slope. The third reason is that the deformation modulus of the concrete and the bedrock of the bank slope section are different, and the shrinkage deformation is inconsistent under the influence of temperature stress and humidity. Due to the above three reasons, the bank slope section of the concrete gravity dam is often contact grouting during the construction process, that is, by burying cooling water pipes, the cooling water is used to reduce the temperature of the dam body to a stable temperature field. Because the concrete dam body is large, the amount of cement used is large, and the hydration heat temperature rises, in order to reduce the temperature of the dam body to a temperature field, it is often necessary to pass water in the first phase, the second phase, or even the third phase. There are many construction procedures, the construction process is cumbersome, and the quality is not guaranteed. Although contact grouting has been carried out, there are still many projects in actual projects where cracks and water leakage occur at the junction of the bank slope dam section and the bedrock. The later treatment is very troublesome, time-consuming, and costly, and the effect is not very good. This brings inconvenience to the operation and management of the dam, and there is water leakage in the dam body, which poses a safety hazard. In engineering practice, cracks have appeared in Taolinkou Dam in Hebei, Panjiakou Dam, Chonghur Dam in Xinjiang, Longkou Dam, etc., resulting in water leakage in the dam body. Therefore, it is urgent to solve the above problems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a structure for preventing water leakage from cracking in the bank slope section of a concrete dam. Two semicircular permeable pipes are arranged in the bank slope section and clay is filled inside. When cracks occur between the bank slope section and the bedrock surface, clay particles flow out with the leakage water to block the gap, thereby effectively preventing water leakage from the dam body.

[0004] The technical solution of the present invention:

[0005] A structure to prevent cracking and water leakage in the bank slope section of a concrete dam. Before pouring the concrete of the bank slope section, two semicircular permeable pipes are arranged on the slope of the bank rock foundation, and clay is filled and compacted inside to form two clay water-stopping dikes. The good plasticity and adaptive deformation ability of the clay soil can adapt to the inconsistent deformation between the bank slope section and the bedrock, thereby achieving the effect of anti-seepage. On the downstream side of the dam section on the slope of the bank rock foundation, a semicircular permeable pipe is arranged along the slope, and on the plane of the bank rock foundation, a semicircular permeable pipe is arranged along the water flow direction to form a longitudinal and transverse drainage network to centrally remove the leakage water. Geotextile is wrapped around the outside of the semicircular permeable pipe to prevent the loss of clay particles, and to prevent fine particles in the clay from being carried away to play a role of anti-filtration protection. The good plasticity and adaptive deformation ability of the clay soil can adapt to the inconsistent deformation between the bank slope section and the bedrock, thereby achieving the effect of anti-seepage.

[0006] Beneficial effects of the present invention: This structure effectively prevents water leakage from the dam body when the dam body shrinks and cracks occur in the rock foundation through the clay backfilled in the semicircular permeable pipe, and is easy to construct, requires little investment, and has good effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structure that prevents cracking and water leakage in the concrete dam bank slope section.

[0008] Fig. 2 (a) is a schematic diagram of a semicircular permeable pipe;

[0009] Figure 2(b) is a schematic diagram of a semicircular permeable drainage pipe.

[0010] In the figure: 1 dam body of the bank slope dam section; 2 bank slope bedrock; 3 bank slope bedrock plane; 4 the first row of semicircular permeable pipes; 5 the second row of semicircular permeable pipes; 6 semicircular permeable drainage pipes flowing along the water flow; 7 semicircular permeable drainage pipes flowing along the slope; 8 bank slope bedrock surface; 9 clay; 10 permeable geotextile. DETAILED DESCRIPTION

[0011] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0012] like Figure 1 As shown, a structure for preventing cracking and water leakage of a concrete dam bank slope section comprises a bank slope dam section body 1, a bank slope bedrock 2, a bank slope slope bedrock surface 8, and a bank slope bedrock plane 3. A first row of semicircular permeable pipes 4 and a second row of semicircular permeable pipes 5 are arranged inside the bank slope dam section body 1 and on the bank slope slope bedrock surface 8, and clay 9 is filled inside the first row of semicircular permeable pipes 4 and the second row of semicircular permeable pipes 5. A semicircular permeable drainage pipe 7 is arranged along the slope on the bank slope slope bedrock surface 8 inside the bank slope dam section body 1. A semicircular permeable drainage pipe 6 is arranged along the water flow direction on the bank slope bedrock plane 3 inside the bank slope dam section body 1. The semicircular permeable drainage pipe 7 along the slope and the semicircular permeable drainage pipe 6 along the water flow direction are wrapped with a permeable geotextile 10.

[0013] The distance between the first row of semicircular water-permeable pipes 4 and the second row of semicircular water-permeable pipes 5 is ≥ 2.0 m;

[0014] The diameters of the first row of semicircular water-permeable pipes 4 and the second row of semicircular water-permeable pipes 5 are ≥ 30 cm, and the materials are but not limited to sand-free water-permeable pipes, and can also be steel pipes with holes;

[0015] The first row of semicircular water-permeable pipes 4 and the second row of semicircular water-permeable pipes 5 are filled with clay 9, the clay content of the clay is ≥ 20%, the plasticity index is ≥ 20%, and the heavy loam or heavy silty clay is preferred;

[0016] The diameter of the semicircular permeable drainage pipe 7 along the slope and the semicircular permeable drainage pipe 6 along the water flow is ≥30cm, and the material is but not limited to sand-free permeable pipe, and can also be a steel pipe with holes;

[0017] The following is a detailed description. In this embodiment, the construction is carried out according to the following steps: before pouring the concrete of the bank slope dam section, two semicircular permeable pipes are set on the slope of the bank rock foundation, and clay is filled and compacted inside to form two clay water stop embankments. Through the good plasticity and adaptive deformation ability of the clay soil, it can adapt to the inconsistent deformation of the bank slope dam section and the bedrock, thereby achieving the effect of anti-seepage. On the downstream side of the dam section on the slope of the bank rock foundation, a semicircular permeable pipe along the slope is laid, and on the plane of the bank rock foundation, a semicircular permeable pipe along the water flow direction is laid to form a longitudinal and transverse drainage network to centrally remove the seepage water. Geotextile is wrapped on the outside of the semicircular permeable pipe to prevent the loss of clay particles, which is used to prevent fine particles in the clay from being carried away and play a role of anti-filtration protection. Through the good plasticity and adaptive deformation ability of the clay soil, it can adapt to the inconsistent deformation of the bank slope dam section and the bedrock, thereby achieving the effect of anti-seepage, and the entire construction is completed.

[0018] The above examples are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited by this example alone, that is, any equivalent changes or modifications made to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A structure for preventing water leakage from cracking of concrete dam bank slope section, characterized in that: The structure for preventing cracking and water leakage of a concrete dam bank slope section comprises a bank slope section dam body (1), bank slope bedrock (2), a bank slope bedrock plane (3) and a bank slope bedrock surface (8); a first row of semicircular permeable pipes (4) and a second row of semicircular permeable pipes (5) are arranged inside the bank slope section dam body (1) and on the bank slope bedrock surface (8); clay (9) is filled inside the first row of semicircular permeable pipes (4) and the second row of semicircular permeable pipes (5); 1) a semi-circular permeable drainage pipe (7) is arranged along the slope inside and on the bank slope bedrock surface (8); a semi-circular permeable drainage pipe (6) along the water flow direction is arranged inside the bank slope dam section dam body (1) and on the bank slope bedrock plane (3); the semi-circular permeable drainage pipe (7) along the slope and the semi-circular permeable drainage pipe (6) along the water flow direction are wrapped with a permeable geotextile (10) on the outside; the clay (9) has a particle content of ≥20% and a plasticity index of ≥20%, and is heavy loam or heavy silty clay; On the downstream side of the upper dam section of the bank slope bedrock surface (8), a semi-circular permeable drainage pipe (7) is laid along the slope, and on the bank slope bedrock plane (3), a semi-circular permeable drainage pipe (6) is laid along the water flow to form a longitudinal and transverse drainage pipe network for centralized drainage of seepage water; By utilizing the good plasticity and deformation adaptability of clay, the inconsistency between the deformation of the dam body (1) and the bank slope bedrock (2) of the bank slope dam section can be accommodated, thereby achieving the effect of anti-seepage.

2. The structure for preventing water leakage from cracking of concrete dam bank slope section according to claim 1 is characterized in that: The spacing between the first row of semicircular water-permeable pipes (4) and the second row of semicircular water-permeable pipes (5) is ≥2.0 m.

3. The structure for preventing water leakage from cracking of concrete dam bank slope section according to claim 1 or 2, characterized in that: The diameter of the first row of semicircular water-permeable pipes (4) and the second row of semicircular water-permeable pipes (5) is ≥30 cm, and the material is sand-free water-permeable pipes or steel pipes with holes.

4. The structure for preventing water leakage from cracking of concrete dam bank slope section according to claim 1 or 2, characterized in that: The semicircular permeable drainage pipe (7) along the slope and the semicircular permeable drainage pipe (6) along the water flow have a diameter of ≥30 cm and are made of sand-free permeable pipe or steel pipe with holes.

5. The structure for preventing water leakage from cracking of concrete dam bank slope section according to claim 3 is characterized in that: The semicircular permeable drainage pipe (7) along the slope and the semicircular permeable drainage pipe (6) along the water flow have a diameter of ≥30 cm and are made of sand-free permeable pipe or steel pipe with holes.

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