Connecting structure of asphalt concrete core wall and concrete diaphragm wall

Abstract

The utility model belongs to the technical field of water conservancy and hydropower engineering construction, and particularly relates to a connecting structure of an asphalt concrete core wall and a concrete diaphragm wall. The structure is organically composed of a concrete diaphragm wall, an asphalt concrete core wall, a transition layer, a covering layer, a dam filling material, a cushion layer, a connecting section, a water stop and a detection pipe. The connecting structure is mainly used for connecting an asphalt concrete core wall and a concrete diaphragm wall of a deep covering layer. According to the utility model, the deformation of the asphalt concrete core wall and the concrete anti-seepage wall can be adjusted by injecting water into the cavities of the connecting sections, so that the stress of the whole anti-seepage structure is released, the problem that the settlement of the full-rigid concrete anti-seepage wall and the settlement of a covering layer are inconsistent is solved, and meanwhile, the project investment is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering construction, and specifically relates to a connecting structure of an asphalt concrete core wall and a concrete anti-seepage wall. Background Art

[0002] Asphalt concrete core wall is widely used in rockfill dam core wall and gravel dam core wall due to its large adaptive deformation capacity. In deep covering layer, it is often used in conjunction with concrete anti-seepage wall as the anti-seepage body of dam. In joint use, the connection between asphalt concrete core wall and concrete anti-seepage wall becomes a weak link, which is crucial to the integrity of the anti-seepage body. There are many studies on the connection methods between asphalt concrete core wall and concrete anti-seepage wall. For example, CN215759195U connects the asphalt concrete core wall with the concrete anti-seepage wall by setting a longitudinal copper waterstop on the upper part of the concrete corridor, setting rubber pad spacer material and two longitudinal copper waterstops on the lower part of the concrete corridor, and filling the corridor waterstop with high plasticity clay. It can improve the anti-seepage property of the connection between asphalt concrete core wall and concrete anti-seepage wall, but it is difficult to solve the problem of uneven settlement between rigid concrete anti-seepage wall and surrounding dam foundation, and it also increases the deformation difference between asphalt concrete core wall and dam shell material, which poses a safety hazard. In view of the problems of the prior art, for example, CN105464056A fills the arched connecting section with flexible anti-seepage material. When the settlement of the concrete anti-seepage wall in the dam foundation is inconsistent with that of the covering layer, the flexible anti-seepage material can be squeezed to release the deformation. The upper part of the arched connecting section of the structure is connected to the asphalt concrete core wall, which is not easy to construct. Since the asphalt concrete core wall is generally rolled and formed at high temperature, the soft asphalt concrete core wall is easily affected by the splitting of the arch under the action of construction pressure load or self-weight load. For example, CN109356102A connects the asphalt concrete core wall and the concrete anti-seepage wall in a vertical spatial dislocation and arranges a horizontal anti-seepage connection structure. This structure can solve the problem of inconsistent settlement of the rigid concrete anti-seepage wall and the covering layer. However, because it increases the length of the horizontal section, the engineering volume and investment are significantly increased. Utility Model Content

[0003] The utility model provides a connecting structure of an asphalt concrete core wall and a concrete anti-seepage wall, and aims to provide a solution to the problem of inconsistent settlement between a rigid concrete anti-seepage wall and a covering layer, and optimize the connecting structure, thereby saving engineering investment.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A connection structure of an asphalt concrete core wall and a concrete anti-seepage wall, comprising a concrete anti-seepage wall, an asphalt concrete core wall, a transition layer, a covering layer, a dam filling material, a cushion layer, a connecting section, a water stop and a detection tube; the concrete anti-seepage wall is vertically arranged, and covering layers are arranged on both sides thereof; the top of the concrete anti-seepage wall is connected to the vertically arranged asphalt concrete core wall through a connecting section; the detection tube is vertically arranged in the transition layer and is located on the downstream side of the connecting section, and its bottom is connected to the connection between the connecting section and the concrete anti-seepage wall; the cushion layer is arranged between the connecting section and the covering layer; the transition layer is arranged on the covering layer and connected to the connecting section and the side wall of the asphalt concrete core wall; the dam filling material is arranged on the outer wall of the transition layer; and water stops are arranged at the connection between the connecting section and the asphalt concrete core wall and at the connection between the connecting section and the concrete anti-seepage wall.

[0006] The top of the concrete anti-seepage wall is 0.4-0.8m higher than the base surface of the covering layer.

[0007] The width of the cushion layer exceeds the two sides of the connecting section by 20 cm; the thickness of the cushion layer is 10 to 20 cm.

[0008] The cushion layer is a plain concrete layer, and the concrete strength is C20.

[0009] The connecting section is an inverted concave structure, and the two side walls of the upper part of the connecting section are inclined to form a trapezoid that is narrow at the top and wide at the bottom, and an arc groove is arranged at the center of the top.

[0010] The distance between the top of the concave opening on the connecting section and the top of the concrete anti-seepage wall is not less than 50 cm, and the gap between the side wall of the concave opening and the vertical side wall of the concrete anti-seepage wall is 2 to 3 cm.

[0011] The water stop is made of copper; the gap of the water stop arranged between the concrete anti-seepage wall and the lower part of the connecting section is filled with polyurethane sealant.

[0012] The detection tube is a hollow galvanized steel tube; the detection tube is an integrated structure consisting of a vertical section and a bending section; the bending section is connected to the joint of the connecting section and the concrete anti-seepage wall; the top of the vertical section is connected to the atmosphere.

[0013] The horizontal width of the transition layer is 1.3 to 3.0 m.

[0014] Beneficial effects:

[0015] (1) The utility model is composed of a concrete anti-seepage wall, an asphalt concrete core wall, a transition layer, a covering layer, a dam filling material, a cushion layer, a connecting section, a water stop and a detection tube, and is mainly used for connecting an asphalt concrete core wall with a thick covering layer and a concrete anti-seepage wall. The utility model adjusts the deformation of the asphalt concrete core wall and the concrete anti-seepage wall by injecting water into the cavity of the connecting section, thereby releasing the stress of the entire anti-seepage structure and solving the problem of inconsistent settlement between the full rigid concrete anti-seepage wall and the covering layer.

[0016] (2) The utility model can simply detect the water level rise through the detection tube and evaluate the degree of dam settlement.

[0017] (3) The utility model has a simple structure and low cost, which effectively reduces the investment in the project.

[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] In the figure: 1. Concrete anti-seepage wall; 2. Asphalt concrete core wall; 3. Transition layer; 4. Cover layer; 5. Dam filling material; 6. Cushion layer; 7. Connection section; 8. Water stop; 9. Detection tube. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] according to Figure 1The asphalt concrete core wall and concrete anti-seepage wall connection structure shown in the figure comprises a concrete anti-seepage wall 1, an asphalt concrete core wall 2, a transition layer 3, a covering layer 4, a dam filling material 5, a cushion layer 6, a connecting section 7, a water stop 8 and a detection tube 9; the concrete anti-seepage wall 1 is vertically arranged, and the covering layer 4 is arranged on both sides thereof; the top of the concrete anti-seepage wall 1 is connected to the vertically arranged asphalt concrete core wall 2 through the connecting section 7; the detection tube 9 is vertically arranged in the transition layer 3 and is located on the downstream side of the connecting section 7, and its bottom is connected to the connection between the connecting section 7 and the concrete anti-seepage wall 1; the cushion layer 6 is arranged between the connecting section 7 and the covering layer 4; the transition layer 3 is arranged on the covering layer 4 and is connected to the connecting section 7 and the side wall of the asphalt concrete core wall 2; the dam filling material 5 is arranged on the outer wall of the transition layer 3; and water stops 8 are arranged at the connection between the connecting section 7 and the asphalt concrete core wall 2 and at the connection between the connecting section 7 and the concrete anti-seepage wall 1.

[0025] The utility model is mainly used for connecting the asphalt concrete core wall of a thick covering layer with a concrete anti-seepage wall, and solves the problem of inconsistent settlement between the full-rigid concrete anti-seepage wall and the covering layer.

[0026] The concrete anti-seepage wall 1 is mainly arranged in the covering layer 4 to prevent water from penetrating in the covering layer 4. No large excavation is required. A percussion drill or a trenching machine is directly used to dig grooves and pour concrete. The economic benefit is more prominent when the concrete anti-seepage wall 1 is used in a thick covering layer with a height of more than 50m. The depth and width of the concrete anti-seepage wall 1 are generally 0.5 to 1.0m deep into the rock layer, and the width is generally 0.6 to 1.3m.

[0027] Asphalt concrete core wall 2, as the main anti-seepage structure in the dam body, is determined according to relevant specifications, and its thickness is selected according to the dam height, engineering level, seismic requirements and construction conditions. The maximum thickness of the core wall bottom should be 1 / 110 to 1 / 70 of the dam height, and the minimum thickness of the core wall top should not be less than 40cm.

[0028] Furthermore, the top of the concrete cut-off wall 1 is 0.4 to 0.8 m higher than the foundation surface of the covering layer 4, creating conditions for the installation and implementation of the connecting section 7, and its main function is to limit the upstream and downstream horizontal displacement of the upper structure; in order to prevent the displacement of the upper structure from generating a large bending moment on the concrete cut-off wall, the height of the top of the concrete cut-off wall 1 above the foundation surface of the covering layer should be within 0.8 times the width of the concrete cut-off wall.

[0029] The cushion layer 6 is the leveling base of the structure of the utility model, which is arranged on the covering layer foundation surface on both sides of the concrete anti-seepage wall, and exceeds the connection section 7 by 20 cm on both sides; the thickness of the cushion layer 6 is preferably 10 to 20 cm, and a smaller value is taken when the gap on the covering layer foundation surface is smaller, and a larger value is taken when the gap on the covering layer foundation surface is larger; the cushion layer 6 is made of plain concrete, and the concrete strength is preferably C20.

[0030] When the thickness of the cover layer 4 is generally greater than 20 m, arranging the concrete anti-seepage wall 1 has greater advantages than large excavation.

[0031] The dam filling material 5 is generally cohesionless soil, gravel soil or rockfill.

[0032] Furthermore, the connecting section 7 is an inverted concave structure, and the upper side walls of the connecting section 7 are inclined, forming a trapezoid that is narrow at the top and wide at the bottom, and an arc groove is provided at the top center; the connecting section 7 is made of reinforced concrete, and the concrete strength is not less than C30.

[0033] Furthermore, the distance between the top of the concave opening on the connecting section 7 and the top of the concrete anti-seepage wall 1 is not less than 50 cm, and the gap between the side wall of the concave opening and the vertical side wall of the concrete anti-seepage wall 1 is 2 to 3 cm.

[0034] Furthermore, the water stop 8 is made of copper; the gap of the water stop arranged between the concrete anti-seepage wall 1 and the lower part of the connecting section 7 is filled with polyurethane sealant.

[0035] The connection section 7, the concave opening, the top of the concrete anti-seepage wall and the two water stops form a sealed cavity, and the height of the sealed cavity is not less than 50 cm. When the thickness of the covering layer 4 is large, the height of the sealed cavity can be appropriately increased.

[0036] In a specific application, the bottom end of the asphalt concrete core wall 2 is configured to be in an arc shape that matches the top of the connecting section 7 .

[0037] Furthermore, the detection tube 9 is a hollow galvanized steel tube; the detection tube 9 is an integrated structure consisting of a vertical section and a bent section; the bent section is connected to the connection section 7 and the concrete anti-seepage wall 1; the top of the vertical section exceeds the dam surface and is connected to the atmosphere.

[0038] The detection tube 9 is mainly used to detect the quality of the water-stopping construction in the sealed cavity and the later settlement of the dam; after the construction of the water-stop 8 and the connecting section 7 is completed, water is injected into the cavity through the detection tube 9, and the quality of the water-stopping construction is evaluated by detecting the water level reduction value; during the construction process, as the dam is filled and raised, the settlement of the dam can be evaluated by detecting the water level rise value.

[0039] If the construction of the water stop 8 does not meet the standards, or if the water stop fails in the later operation of the dam, the detection pipe 9 can also be used as a grouting pipe, mainly injecting polypropylene sealing material, so as to improve the overall water stop effect of the structure.

[0040] Furthermore, the horizontal width of the transition layer 3 is 1.3 to 3.0 m.

[0041] The transition layer 3 is arranged on both sides of the asphalt concrete core wall 2. After compaction, the transition layer 3 should have deformation coordination and permeability stability. The horizontal width of the transition layer should be 1.3 to 3.0 m, and the thickness should be appropriately increased in strong earthquake areas and areas with obvious changes in the slope.

[0042] The principle of the utility model is as follows:

[0043] After the construction of this structure is completed, the filling height of the dam rises and the load borne by the structure increases. Since the concrete anti-seepage wall has greater rigidity and less settlement, and the surrounding dam foundation covering layer has less rigidity and greater settlement, the water is pressed out by squeezing the cavity, releasing the structural stress of the anti-seepage body, thereby improving the reliability of the anti-seepage structure.

[0044] The utility model adjusts deformation by injecting water into the cavity, thereby releasing the stress of the entire anti-seepage structure, solving the problem of inconsistent settlement between the rigid concrete anti-seepage wall and the covering layer, and reducing the investment in the project.

[0045] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0048] The above is only a preferred embodiment of the utility model. The utility model will not be limited to these embodiments shown in this article, but should conform to the widest range consistent with the principles and novel features disclosed in this article. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model still fall within the scope of the technical solution of the utility model.

Claims

1. A connection structure of an asphalt concrete core wall and a concrete anti-seepage wall, characterized in that: The invention comprises a concrete anti-seepage wall (1), an asphalt concrete core wall (2), a transition layer (3), a covering layer (4), a dam filling material (5), a cushion layer (6), a connecting section (7), a water stop (8) and a detection tube (9); the concrete anti-seepage wall (1) is arranged vertically, and the covering layers (4) are arranged on both sides thereof; the top of the concrete anti-seepage wall (1) is connected to the vertically arranged asphalt concrete core wall (2) through the connecting section (7); the detection tube (9) is arranged vertically in the transition layer (3) and is located below the connecting section (7). On the upstream side, its bottom is connected to the connection point between the connecting section (7) and the concrete anti-seepage wall (1); the cushion layer (6) is arranged between the connecting section (7) and the covering layer (4); the transition layer (3) is arranged on the covering layer (4) and connected to the connecting section (7) and the side wall of the asphalt concrete core wall (2); the dam filling material (5) is arranged on the outer side wall of the transition layer (3); and water stops (8) are arranged at the connection points between the connecting section (7) and the asphalt concrete core wall (2) and the connection points between the connecting section (7) and the concrete anti-seepage wall (1).

2. The asphalt concrete core wall and concrete anti-seepage wall connection structure according to claim 1, characterized in that: The top of the concrete anti-seepage wall (1) is 0.4 to 0.8 m higher than the construction surface of the covering layer (4).

3. The asphalt concrete core wall and concrete anti-seepage wall connection structure according to claim 1, characterized in that: The width of the cushion layer (6) exceeds the two sides of the connecting section (7) by 20 cm; the thickness of the cushion layer (6) is 10 to 20 cm.

4. The asphalt concrete core wall and concrete anti-seepage wall connection structure as claimed in claim 1 or 3, characterized in that: The cushion layer (6) is a plain concrete layer, and the concrete strength is C20.

5. The asphalt concrete core wall and concrete anti-seepage wall connection structure as claimed in claim 1 or 3, characterized in that: The connecting section (7) is an inverted concave structure, and the upper side walls of the connecting section (7) are inclined, forming a trapezoid that is narrow at the top and wide at the bottom, and an arc groove is provided at the center of the top.

6. The asphalt concrete core wall and concrete anti-seepage wall connection structure as claimed in claim 5, characterized in that: The distance between the top of the concave opening on the connecting section (7) and the top of the concrete anti-seepage wall (1) is not less than 50 cm, and the gap between the side wall of the concave opening and the vertical side wall of the concrete anti-seepage wall (1) is 2 to 3 cm.

7. The asphalt concrete core wall and concrete anti-seepage wall connection structure according to claim 1, characterized in that: The water stop (8) is made of copper; the gap of the water stop arranged between the concrete anti-seepage wall (1) and the lower part of the connecting section (7) is filled with polyurethane sealant.

8. The asphalt concrete core wall and concrete anti-seepage wall connection structure according to claim 1, characterized in that: The detection tube (9) is a hollow galvanized steel tube; the detection tube (9) is an integrated structure consisting of a vertical section and a bent section; the bent section is connected to the connection between the connecting section (7) and the concrete anti-seepage wall (1); and the top of the vertical section is connected to the atmosphere.

9. The asphalt concrete core wall and concrete anti-seepage wall connection structure according to claim 1, characterized in that: The horizontal width of the transition layer (3) is 1.3 to 3.0 m.

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