Anti-seepage earth rock cofferdam structure

Abstract

The utility model belongs to the technical field of hydraulic engineering, and particularly relates to an anti-seepage earth rock cofferdam structure which comprises a horizontally-arranged concrete base plate. The concrete core wall is vertically arranged, and the bottom end of the concrete core wall vertically and downwards penetrates through the concrete base plate and extends into the ground; clay core protection walls, earth-rock mixed layers, isolation layers, concrete reinforcing layers, composite geomembranes and stone protection slopes are sequentially and symmetrically arranged on the two sides of the concrete core wall from inside to outside. The earth rock cofferdam with a good anti-seepage effect is formed by arranging a plurality of components such as the concrete base plate, the concrete core wall, the clay core protection wall, the earth rock mixing layer, the isolation layer, the concrete reinforcing layer, the composite geomembrane and the stone protection slope and designing the specific shape and structure of each component, and the service life of the earth rock cofferdam can be prolonged; good application prospects are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy projects, and particularly relates to an impervious earth-rock cofferdam structure. Background Art

[0002] In the construction of water conservancy and hydropower projects, it is often necessary to set up a cofferdam in the river channel to form a construction environment for sewage, so as to facilitate the construction within the cofferdam. Common cofferdams include earth-rock cofferdams, grass cofferdams, wooden board cofferdams, steel sheet pile cofferdams, etc. For some river channels with deep overburden in narrow river valleys, earth-rock cofferdams are generally used.

[0003] An earth-rock cofferdam has been publicly disclosed in the prior art. For example, the patent of CN209975545U discloses an earth-rock cofferdam adapted to high flow velocity, which includes a trapezoidal cofferdam body and an inner slope protection. The inner slope protection is laid on the inner side of the cofferdam body, and the inner slope protection is composed of multiple stone bags. The stone bag is formed by wrapping gravel with a wire cage. Since the inner slope protection is composed of stone bags, and the stone bag is formed by wrapping gravel with a wire cage, the inner slope protection has the performance of resisting scouring due to the gravel in the stone bag. Moreover, the stone bags form an integral structure, so that the gravel is not easily washed away by the high-flow velocity water. After the high-flow velocity water impacts the inner slope protection, it can be greatly reduced the scouring speed of the water flow on the cofferdam body after being blocked and buffered by the gravel in the stone bag. Therefore, the earth-rock cofferdam can adapt to high-flow velocity rivers.

[0004] It is undeniable that the earth-rock cofferdam adapted to high flow velocity disclosed in this patent can indeed achieve the above effects, but it still has certain deficiencies: Engineering practice has shown that the impervious performance of the cofferdam has become the key to affecting the quality of project construction. However, the earth-rock cofferdam adapted to high flow velocity disclosed in the above patent is prone to water seepage phenomenon and then instability under the action of repeated scouring of water flow, so that the overall stability of the entire earth-rock cofferdam needs to be improved.

[0005] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide an impervious earth-rock cofferdam structure to solve the problems existing in the earth-rock cofferdam adapted to high flow velocity in the background art.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] An impervious earth-rock cofferdam structure, comprising:

[0009] A horizontally arranged concrete substrate;

[0010] A vertically arranged concrete core wall, the bottom end of the concrete core wall vertically penetrates the concrete base plate and extends into the ground;

[0011] On both sides of the concrete core wall, a clay core wall protection, a soil-rock mixture layer, an isolation layer, a concrete reinforcement layer, a composite geomembrane and a stone slope protection are symmetrically arranged from the inside out in sequence; wherein, the top of the soil-rock mixture layer covers the top of the clay core wall protection; the top of the isolation layer is flush with the top of the soil-rock mixture layer; the top of the composite geomembrane covers the top of the concrete reinforcement layer and is flush with the top of the soil-rock mixture layer.

[0012] Preferably, at least two groups of ground piles with the bottom ends extending into the ground are symmetrically arranged at the bottom of the concrete base plate.

[0013] Preferably, a high-pressure jet anti-seepage paint is sprayed on the outer wall of the concrete core wall.

[0014] Preferably, the lower ends of the outer walls of the clay core wall protection, the soil-rock mixture layer, the isolation layer, the concrete reinforcement layer, the composite geomembrane and the stone slope protection all incline outwards; and the lower end of the isolation layer is inserted into the concrete base plate.

[0015] Preferably, a limiting groove is arranged at the top of the concrete reinforcement layer; a convex block corresponding to the limiting groove is arranged at the top of the stone slope protection.

[0016] Preferably, a connecting part is bent inwards at the bottom of the composite geomembrane, and the connecting part is located at the bottom of the concrete reinforcement layer.

[0017] Preferably, two rubber anti-scour feet are symmetrically arranged at both ends of the concrete base plate, and a fixing part in the shape of the letter "T" is integrally formed at the top of the inner end of the anti-scour feet; the outer ends of the anti-scour feet are rounded.

[0018] Preferably, grooves are arranged at both ends of the concrete base plate.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] (1) Through structures such as the composite geomembrane and the high-pressure jet anti-seepage paint arranged in the utility model, the anti-seepage performance is improved. The composite geomembrane is laid on the surface of the concrete reinforcement layer, and the composite geomembrane has good anti-seepage function as the first anti-seepage layer. The stone slope protection prevents the water flow from directly scouring the composite geomembrane and causing the loss of anti-seepage function. The steel bars arranged inside the stone slope protection play a role in strengthening its performance. After the concrete core wall is poured, the high-pressure jet anti-seepage paint is applied to it, so that it has the function of preventing water penetration as the second anti-seepage layer.

[0021] (2) The utility model improves the service life by setting structures such as anti - impact feet and concrete base plates. The anti - impact feet are fixed on the ground, and then the concrete base plate is poured. When the concrete base plate solidifies and forms, the anti - impact feet are connected to the concrete base plate as a whole. The structure of the rounded corners at the outer ends of the anti - impact feet and the grooves of the concrete base plate can guide the water flow and prevent the water flow from directly impacting the bottom of the stone cofferdam. In addition, the clay core wall closely adheres to the concrete core wall, which can prevent the concrete core wall from toppling, and the clay core wall can protect against the loss of the anti - seepage function caused by the peeling off of the high - pressure jet anti - seepage paint. Brief Description of the Drawings

[0022] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 is a schematic diagram of the partial structure at the high - pressure jet anti - seepage paint of the utility model;

[0024] Figure 3 is a schematic diagram of the partial structure at the composite geomembrane of the utility model.

[0025] Main reference numeral descriptions:

[0026] 1. Concrete base plate; 11. Ground pile; 12. Groove; 2. Concrete core wall; 21. High - pressure jet anti - seepage paint; 3. Clay core wall; 4. Earth - rock mixture layer; 5. Isolation layer; 6. Concrete reinforcement layer; 61. Limit groove; 7. Composite geomembrane; 71. Connection part; 8. Stone slope protection; 81. Protrusion; 9. Anti - impact foot. Detailed Embodiment

[0027] The technical solutions of the patent of the utility model will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the utility model.

[0028] Embodiment

[0029] Refer to the attached Figures 1 - 3 , a seepage - proof earth - rock cofferdam structure, comprising:

[0030] A horizontally arranged concrete base plate 1; At least two groups of ground piles 11 with the bottom extending into the ground are symmetrically arranged at the bottom of the concrete base plate 1, and the bottom of the ground piles 11 extends into the ground by 80 - 100 cm;

[0031] A vertically arranged concrete core wall 2, the bottom end of the concrete core wall 2 vertically penetrates the concrete base plate 1 and extends into the ground, and the bottom end of the concrete core wall 2 extends into the ground by 100 - 120 cm; The outer wall of the concrete core wall 2 is sprayed with high - pressure jet anti - seepage paint 21;

[0032] There are a clay core wall protection layer 3, a soil-rock mixture layer 4, an isolation layer 5, a concrete reinforcement layer 6, a composite geomembrane 7 and a stone revetment 8 symmetrically arranged on both sides of the concrete core wall 2 from the inside out in sequence; among them, the top of the soil-rock mixture layer 4 covers the top of the clay core wall protection layer 3; the top of the isolation layer 5 is flush with the top of the soil-rock mixture layer 4; the top of the composite geomembrane 7 covers the top of the concrete reinforcement layer 6 and is flush with the top of the soil-rock mixture layer 4. In addition, the lower ends of the outer walls of the clay core wall protection layer 3, the soil-rock mixture layer 4, the isolation layer 5, the concrete reinforcement layer 6, the composite geomembrane 7 and the stone revetment 8 are all inclined outward; and the lower end of the isolation layer 5 is inserted into the concrete base plate 1. Secondly, a limiting groove 61 is provided at the top of the concrete reinforcement layer 6; a convex block 81 corresponding to the limiting groove 61 is provided at the top of the stone revetment 8; a connecting part 71 is bent inward at the bottom of the composite geomembrane 7, and the connecting part 71 is located at the bottom of the concrete reinforcement layer 6, so that the concrete reinforcement layer 6, the composite geomembrane 7 and the stone revetment 8 can be connected more tightly and firmly.

[0033] In this embodiment, two rubber anti-scour feet 9 are symmetrically provided at both ends of the concrete base plate 1, and a letter "T"-shaped fixing part 91 is integrally formed at the top of the inner end of the anti-scour foot 9; the outer end of the anti-scour foot 9 is rounded, and grooves 12 are provided at both ends of the concrete base plate 1, so that the water flow can be guided to prevent the water flow from directly impacting the bottom of the earth-rock cofferdam.

[0034] During construction, pile holes corresponding to the concrete core wall 2 and the ground piles 11 are first dug on the ground, and then the concrete core wall 2 and the concrete base plate 1 are poured. The concrete core wall 2 and the ground piles 11 cooperate with the pile holes, which can prevent the earth-rock cofferdam from being displaced as a whole by the impact of the water flow and losing the cofferdam effect. After the concrete core wall 2 is poured, a high-pressure jet grouting anti-seepage paint 21 is sprayed on it to make the concrete core wall 2 have the anti-seepage function. In addition, before pouring the concrete base plate 1, the anti-scour feet 9 are first fixed on the ground, so that when the concrete base plate 1 solidifies and forms, the fixing part 91 of the anti-scour feet 9 will be firmly connected and fixed, and the anti-scour feet 9 and the concrete base plate 1 are connected as a whole to form an integral body. Then the clay core wall protection layer 3 is laid. The clay core wall protection layer 3 closely adheres to the concrete core wall 2, which can effectively prevent the concrete core wall 2 from toppling, and the clay core wall protection layer 3 can also prevent the high-pressure jet grouting anti-seepage paint 21 from falling off and losing the anti-seepage function. The soil-rock mixture layer 4 is laid on the clay core wall protection layer 3, and after the isolation layer 5 is set, the concrete reinforcement layer 6 is poured. The composite geomembrane 7 is laid on the surface of the concrete reinforcement layer 6 and the stone revetment 8 is poured. The stone revetment 8 can prevent the water flow from directly scouring the composite geomembrane 7 and losing the anti-seepage function.

[0035] The foregoing description of the specific exemplary embodiments of the present utility model is for purposes of illustration and exemplification. These descriptions are not intended to limit the present utility model to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present utility model and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the present utility model, as well as various different selections and changes. The scope of the present utility model is intended to be defined by the claims and their equivalents.

Claims

1. An anti-seepage earth-rock cofferdam structure, characterized in that: include: A concrete base plate set horizontally; A vertically arranged concrete core wall, the bottom end of which vertically penetrates the concrete base plate and extends into the ground; A clay core wall, a soil-rock mixture layer, an isolation layer, a concrete reinforcement layer, a composite geomembrane and a stone slope protection are symmetrically arranged on both sides of the concrete core wall from the inside to the outside; wherein the top of the soil-rock mixture layer covers the top of the clay core wall; the top of the isolation layer is flush with the top of the soil-rock mixture layer; the top of the composite geomembrane covers the top of the concrete reinforcement layer and is flush with the top of the soil-rock mixture layer.

2. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: At least two groups of ground piles with bottoms extending into the ground are symmetrically arranged at the bottom of the concrete base plate.

3. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: The outer wall of the concrete core wall is sprayed with high-pressure spray anti-seepage paint.

4. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: The outer walls of the clay core wall, soil-rock mixed layer, isolation layer, concrete reinforcement layer, composite geomembrane and stone slope protection are all inclined outwards; and the lower end of the isolation layer is inserted into the concrete base plate.

5. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: A limiting groove is arranged on the top of the concrete reinforcement layer; and a convex block corresponding to the limiting groove is arranged on the top of the stone slope protection layer.

6. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: The bottom of the composite geomembrane is bent inward to form a connecting portion, and the connecting portion is located at the bottom of the concrete reinforcement layer.

7. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: Two anti-collision feet made of rubber are symmetrically arranged at both ends of the concrete base plate, and a "T"-shaped fixing portion is integrally formed on the top of the inner end of the anti-collision foot; the outer end of the anti-collision foot is rounded.

8. The anti-seepage earth-rock cofferdam structure according to claim 1, characterized in that: Two ends of the concrete base plate are provided with grooves.

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