CN204715304U - Cofferdam slope protection structure - Google Patents

Abstract

The utility model discloses a cofferdam slope protection structure. Including the cofferdam (1) piled up around the foundation pit with backfill soil and gravel; the cross-sectional shape of the cofferdam is trapezoidal, and the transition material (2) is laid on the slope of the cofferdam upstream surface, and steel bars are stacked on the surface of the transition material The gabion (3) is sprayed with a concrete slurry layer (4) on the surface of the steel gabion. The utility model sets a transition material between the earth and rock slag body and the steel gabion that constitute the earth and rock cofferdam, and plays the role of anti-filtration; Water scouring ability; spraying concrete on the surface of the cofferdam can reduce the surface roughness of the reinforced gabion, ensure smooth flow and increase flow capacity. The utility model can greatly improve the anti-scouring ability of the slope of the cofferdam, and is simple in construction. It can especially resist the erosion of floods with large flow and high velocity, solves the problem of the stability of the slope of the cofferdam under repeated washing by floods, and enhances the The anti-scouring capacity of the cofferdam weir slope.

Description

A cofferdam slope protection structure

technical field

The utility model relates to a cofferdam slope protection structure, which belongs to the technical field of cofferdam engineering in water conservancy and hydropower projects.

Background technique

In the construction of water conservancy and hydropower projects, it is often necessary to build temporary cofferdams to prevent water from entering the foundation pit so that permanent buildings can be built in the foundation pit. The facing surface of the existing earth-rock cofferdam generally adopts the slope protection structure of large stones. When filling the cofferdam, dump trucks are used to throw large stones directly on the slope to form the facing surface of the cofferdam. Self-weight and anti-scourability to protect the slope of the cofferdam from water erosion. The large stone slope protection structure of this cofferdam is convenient and quick to construct, and the cost is low, but its ability to resist water erosion is limited, especially when it is currently built on large rivers. Water conservancy facilities often encounter large-flow floods, and the cofferdams are washed away from time to time.

Utility model content

The purpose of the utility model is to provide a cofferdam slope protection structure to improve the anti-scouring ability of the cofferdam slope surface, which is simple in construction and can especially resist the erosion of floods with large flow and high velocity.

Technical scheme of the utility model:

A cofferdam slope protection structure, including a cofferdam piled around the foundation pit with backfill soil and stone slag; Reinforced gabion, the surface of the reinforced gabion is sprayed with concrete slurry layer.

In the aforementioned cofferdam slope protection structure, the transition material is gravel with a particle size of 2-200 mm, and the thickness of the transition material is 500-800 mm.

In the aforementioned cofferdam slope protection structure, the length, width and height of the reinforced gabion are rectangular cages of 2m×1m×1m or 1m×1m×1m; the rectangular cages are filled with stones with a particle size of 300-500mm.

In the aforementioned cofferdam slope protection structure, the steel bar gabions are stacked stepwise along the slope of the upstream surface of the cofferdam, and the adjacent steel bar gabions are connected by steel bars.

In the aforementioned cofferdam slope protection structure, the thickness of the concrete slurry layer is 100-200 mm.

Compared with the prior art, the utility model sets a transition material between the earth and rock slag body and the steel gabion forming the earth-rock cofferdam to play the role of reverse filtration; The stability of the facing surface and the ability to resist water erosion; spraying concrete on the surface of the cofferdam can reduce the surface roughness of the reinforced gabion, ensure smooth flow and increase flow capacity. The utility model can greatly improve the anti-scouring ability of the slope of the cofferdam, the construction is simple, and it can especially resist the erosion of the flood with large flow and high velocity, and solves the problem of the stability of the slope of the cofferdam under the repeated washing of the flood. The anti-scouring capacity of the cofferdam weir slope.

Description of drawings

Fig. 1 is the structural representation of the utility model.

The marks in the drawings are: 1-cofferdam, 2-transition material, 3-reinforced gabion, 4-concrete slurry layer.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but not as any limitation to the utility model.

A cofferdam slope protection structure, as shown in Figure 1. Including the cofferdam 1 piled up around the foundation pit with backfill soil and gravel; the cross-sectional shape of the cofferdam 1 is trapezoidal, and the transition material 2 is laid on the slope facing the water of the cofferdam 1, and the surface of the transition material 2 is stacked with reinforced stones The cage 3 is sprayed with a concrete slurry layer 4 on the surface of the reinforced gabion 3 . The transition material 2 is gravel with a particle size of 2-200 mm, and the thickness of the transition material 2 is 500-800 mm. The reinforced gabion 3 is a rectangular cage with a length, width and height of 2m×1m×1m or 1m×1m×1m; the rectangular cage is filled with stones with a particle size of 300-500mm. Reinforced gabions 3 are stacked stepwise along the slope facing the water of the cofferdam 1, and adjacent reinforced gabions 3 are connected by reinforcing bars. The thickness of the concrete slurry layer 4 is 100-200 mm.

Example

During specific implementation, implement according to the following steps:

1. First, fill the earth-rock cofferdam. When the cofferdam 1 is being filled, as the cofferdam body rises, the transition material 2 is laid on the upstream weir surface simultaneously, and the transition material 2 is rolled and compacted, and the reinforced gabion 3 Stack leveling position. The particle size of the transition material 2 can be 2-200 mm, and the thickness can be 50-80 cm.

2. Synchronously step back from bottom to top to stack the reinforced gabion 3. The size of the reinforcement cage can be 2m×1m×1m or 1m×1m×1m (length×width×height), and stones are artificially stacked in the reinforcement cage, and the particle size of the stones can be 300-500mm.

3. Finally, spray plain concrete on the entire slope to form a concrete slurry layer 4 protection surface, and the thickness of the sprayed concrete can be 10-20cm.

Claims (5)

1. a cofferdam protective slope structure, comprises the cofferdam (1) piled in foundation ditch surrounding with backfill and rock ballast; It is characterized in that: the shape of cross section of cofferdam (1) is trapezoidal, the slope of cofferdam (1) upstream face is equipped with Transition Materials (2), and Transition Materials (2) surface is stacked with reinforced gabion (3), and reinforced gabion (3) surface is sprayed with concrete pulp layer (4).

2. cofferdam protective slope structure according to claim 1, it is characterized in that: the rubble that described Transition Materials (2) is particle diameter 2 ~ 200mm, Transition Materials (2) thickness is 500 ~ 800mm.

3. cofferdam protective slope structure according to claim 1, is characterized in that: the length, width and height of described reinforced gabion (3) are the rectangle cage of 2m × 1m × 1m or 1m × 1m × 1m; The stone of particle diameter 300 ~ 500mm is filled with in rectangle cage.

4. cofferdam protective slope structure according to claim 1, is characterized in that: described reinforced gabion (3) along the stepped stacking in slope by cofferdam (1) upstream face, through bar connecting between adjacent reinforced gabion (3).

5. cofferdam protective slope structure according to claim 1, is characterized in that: described concrete pulp layer (4) thickness is 100 ~ 200mm.