CN221276510U

CN221276510U - Cushion layer water stopping stem for bank slope of gravity dam

Info

Publication number: CN221276510U
Application number: CN202323266324.3U
Authority: CN
Inventors: 余鹏明; 周泽阳; 常亮; 王军忠; 崔文轩
Original assignee: PowerChina Northwest Engineering Corp Ltd
Current assignee: PowerChina Northwest Engineering Corp Ltd
Priority date: 2023-11-30
Filing date: 2023-11-30
Publication date: 2024-07-05
Anticipated expiration: 2033-11-30

Abstract

The utility model provides a bedding water stopping stem for a bank slope of a gravity dam, which comprises the following components: the groove is paved along the cushion layer of the gravity dam, the cushion layer is paved on bedrock, a mortar leveling layer is paved at the bottom of the groove, micro-expansion concrete is filled in the groove, and copper water stop and rubber water stop are vertically pre-buried at the upper part of the expansion concrete. The utility model can improve the integrity and reliability of the dam seepage-proofing and water-stopping system by only adopting common conventional materials in the existing gravity dam construction without arranging a new building, specially preparing novel materials, influencing the construction period of the gravity dam and interfering the construction of other parts of the dam.

Description

Cushion layer water stopping stem for bank slope of gravity dam

Technical Field

The utility model belongs to the technical field of hydraulic and hydroelectric engineering construction, and particularly relates to a bedding water stopping stem for a bank slope of a gravity dam.

Background

The gravity dam is a traditional dam type which maintains stability by utilizing self gravity and is widely applied to hydraulic and hydroelectric engineering. The water stopping system is an important component for preventing seepage of the dam and is mainly positioned at each permanent joint in the dam body. By arranging the concrete plug and the asphalt well and adopting the measures such as copper water stop and rubber water stop, the water stop measures in the dam body are mature, and the seepage in the gravity dam is generally well controlled through extensive verification. The seepage prevention of the dam not only consists of water stop in the dam, but also is influenced by factors outside the dam body such as seepage around the dam. The existing gravity dam seepage prevention means mainly comprises curtain grouting. The curtain grouting has a relatively general good effect on seepage of the lower part of the dam foundation, can form an effective water interception layer below a foundation surface, and forms a dam seepage prevention system together with water stopping in the dam body. But a water seepage channel is also arranged between curtain grouting below the building base surface and seepage prevention water in the dam body. Particularly, a gap is also formed between the cushion layer and the dam body at the cushion layer position of the gravity dam. Particularly, in the high concrete dam in the areas with larger temperature difference, the good seepage prevention effect can not be achieved by singly arranging contact grouting, so that the whole dam seepage prevention system has weak short plates.

Disclosure of utility model

In view of the above, the present utility model aims to provide a bedding water stop stem for a bank slope of a gravity dam, which solves or partially solves the above drawbacks.

The utility model provides a bedding water stopping stem for a bank slope of a gravity dam, which comprises the following components: the groove is paved along the cushion layer of the gravity dam, the cushion layer is paved on bedrock, a mortar leveling layer is paved at the bottom of the groove, micro-expansion concrete is filled in the groove, and copper water stop and rubber water stop are vertically pre-buried at the upper part of the micro-expansion concrete.

The utility model also has the following optional features.

Optionally, the cross section of the groove is in a trapezoid structure, the slope ratio of the slopes at two sides of the groove is m=p/20, and P is the strength index of the concrete of the cushion layer.

Optionally, the strength index of the micro-expansive concrete in the groove is consistent with the concrete of the cushion layer.

Optionally, the distance between the copper water stop and the rubber water stop in the groove is H/3~H/2, and H is the depth of the groove.

Optionally, the bottom width of the groove is L, l=2h0, h=h0/2, H0 is the thickness of the pad layer, and H is the depth of the groove.

The cushion water stopping stem for the bank slope of the gravity dam does not need to be provided with a new building, does not need to specially prepare novel materials, does not influence the construction period of the gravity dam and does not interfere with the construction of other parts of the dam, and only adopts common conventional materials in the construction of the existing gravity dam, such as water stopping, mortar, concrete and other conventional materials of other parts of the dam, so as to construct trapezoid grooves, cushion layers, mortar leveling layers, micro-expansion concrete and water stopping contained in the structure, and the size, shape and composition of the structure are simpler. The structure can improve the integrity and reliability of the dam seepage-proofing and water-stopping system, and has the advantages of simple engineering construction process flow and investment saving.

Drawings

FIG. 1 is an elevation view of a finished state of a mat stem of the present utility model;

FIG. 2 is a side view of the completed state of the mat stem of the present utility model;

FIG. 3 is an isometric view of the finished state of the bedding water stop stem of the present utility model;

FIG. 4 is a cross-sectional view showing the completed state of the water stop stem of the mat according to the present utility model.

In the above figures: 1. a groove; 2. a gravity dam; 3. a cushion layer; 4. a bedrock; 5. mortar leveling layer; 6. micro-expansion concrete; 7. copper water stopping; 8. rubber water stop.

The present utility model will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

Example 1

Referring to fig. 1, 2, 3 and 4, an embodiment of the present utility model proposes a bedding water stop stem for a bank slope of a gravity dam, comprising: the gravity dam comprises a groove 1, wherein the groove 1 is paved along a cushion layer 3 of a gravity dam 2, the cushion layer 3 is paved on a bedrock 4, a mortar leveling layer 5 is paved at the bottom of the groove 1, micro-expansion concrete 6 is filled in the groove 1, and copper water stop 7 and rubber water stop 8 are vertically pre-buried at the upper part of the micro-expansion concrete 6.

The grooves 1 are distributed at the positions of the left and right bank slope dam foundations and extend towards the river bed dam foundations. The highest elevation of the upper part of the groove 1 is the reservoir check flood level, and the lowest elevation of the lower part is the elevation of the base surface minus the depth H of the groove 1.

The copper water stop 7 and the rubber water stop 8 at other parts of the gravity dam 2 can be directly adopted if the requirements of the width interval are met. The copper water stop 7 prepared on site is connected at a horizontal straight section by adopting lap joint double-sided welding, the lap joint length is not less than 20mm, the special-shaped joint is prefabricated or purchased to be shaped in a factory, and the surface of the welded joint is smooth and free of sand holes or cracks. Aggregate with the grain diameter larger than 40mm should be removed from the concrete close to the copper water stop 7, and the concrete below and around the copper water stop 7 should be vibrated and compacted so as to ensure that the concrete is tightly combined with the copper water stop 7 and avoid forming cavities around the copper water stop 7. The rubber water stop 8 connection should adopt vulcanization thermal bonding.

Example 2

Referring to fig. 4, on the basis of embodiment 1, the cross section of the groove 1 is in a trapezoid structure, the slope ratio of the inclined planes at two sides is m=p/20, and P is the strength index C20 of the concrete of the cushion layer 3.

When the water stopping system is in actual use, the calculation parameters of the section slope ratio m take an engineering preliminary design report and an engineering geological investigation report as calculation basis, so that the construction workload and the engineering quantity are reduced on the premise of ensuring the reliability and the stability of the water stopping system.

Example 3

Referring to fig. 4, on the basis of example 1, the strength index of the micro-expansive concrete 6 in the groove 1 is identical to that of the concrete of the cushion layer 3.

The strength of the micro-expansive concrete 6 in the groove 1 is designated as C20 and corresponds to the concrete of the cushion layer 3. The thickness of the mortar leveling layer 5 meets the requirement of eliminating the uneven surface of the cushion layer 3 after the concrete is poured. The allowable deviation of the surface evenness of the mortar is not more than 4mm.

Example 4

Referring to fig. 4, on the basis of embodiment 1, the bottom width of the groove 1 is L, l=2h0, h=h0/2, H0 is the thickness of the pad layer 3, and H is the depth of the groove 1.

Pad thickness h0=1m, bottom width l=2m of groove 1, and depth h=0.5m of groove 1.

Example 5

Referring to fig. 4, on the basis of example 4, the distance between the copper water stop 7 and the rubber water stop 8 in the groove 1 is H/3~H/2, H being the depth of the groove 1.

The depth h=0.5 m of the groove 1, and the distance between the copper water stop 7 and the rubber water stop 8 is 0.18-0.25 m.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims. The components and structures not specifically described in this embodiment are well known in the art and are not described in detail herein.

Claims

1. A bedding water stem for a gravity dam's bank slope, comprising: the gravity dam comprises a groove (1), wherein the groove (1) is paved along a cushion layer (3) of the gravity dam (2), the cushion layer (3) is paved on a bedrock (4), a mortar leveling layer (5) is paved at the bottom of the groove (1), micro-expansion concrete (6) is filled in the groove (1), and copper water stop (7) and rubber water stop (8) are vertically pre-buried at the upper part of the micro-expansion concrete (6).

2. Bedding water stop stem for a bank slope of a gravity dam according to claim 1, characterized in that the cross section of the groove (1) is in a trapezoid structure, the slope ratio of the slopes on both sides is m=p/20, and P is the strength index of the concrete of the bedding (3).

3. Bedding water stop stem for a bank slope of a gravity dam according to claim 1, characterized in that the strength designation of the micro-expanded concrete (6) in the groove (1) corresponds to the concrete of the bedding (3).

4. Bedding water stop stem for a bank slope of a gravity dam according to claim 1, characterized in that the distance between the copper water stop (7) and the rubber water stop (8) in the groove (1) is H/3~H/2, H being the depth of the groove (1).

5. Bedding water stop stem for a bank slope of a gravity dam according to claim 1, characterized in that the bottom width of the groove (1) is L, L = 2h0, H = H0/2, H0 is the thickness of the bedding (3) and H is the depth of the groove (1).