CN209816797U - Earth-rock dam composite core wall structure - Google Patents
Earth-rock dam composite core wall structure Download PDFInfo
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- CN209816797U CN209816797U CN201920185955.7U CN201920185955U CN209816797U CN 209816797 U CN209816797 U CN 209816797U CN 201920185955 U CN201920185955 U CN 201920185955U CN 209816797 U CN209816797 U CN 209816797U
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Abstract
The utility model discloses a compound core wall structure of earth and rockfill dam, include: a centrally filled asphalt concrete core or clay core having a core foundation at the bottom thereof; an HDPE membrane tightly attached to the upstream surface of the asphalt concrete core or the clay core; wherein, before filling the asphalt concrete core or the clay core, the HDPE film is arranged on the upstream side of the asphalt concrete core or the clay core and the bottom of the HDPE film is embedded into the core foundation. The utility model discloses reduce the influence that the environment was filled out asphalt concrete core or clay core, promote the life-span and the stability of earth and rockfill dam prevention of seepage system.
Description
Technical Field
The utility model relates to an earth and rockfill dam core wall prevention of seepage technical field especially relates to an earth and rockfill dam composite core wall structure.
Background
In the design and construction of the earth-rock dam, the roller compacted asphalt concrete or the local cohesive soil is widely used as the impervious core wall material, in practice, the asphalt concrete or the cohesive soil as the impervious core wall damming material has strict specifications and test requirements on the construction process, but in the constructed roller compacted asphalt concrete core wall dam or the clay core wall dam, the problems of core wall defects and even seepage failure caused by dam settlement or construction quality and the like still exist in the later stage of part of the dams, so that a large amount of extra resources are needed for realizing the restoration of an impervious system, and the safe operation of the dams can be seriously influenced.
HDPE (high density polyethylene) films are widely used in civil engineering fields such as civil engineering, mines, water conservancy and environment, and are used as anti-seepage or isolation materials, so that the HDPE films have very good corrosion resistance, tear resistance and high stability; and the HDPE impermeable membrane with the thickness of 3mm and the width of more than 6 meters is produced in China, the HDPE membrane is mature by adopting a hot-melt welding or gluing technology, the welding quality is simple and convenient to detect, and the HDPE can not generate any harmful object.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the problem that above-mentioned prior art exists, providing a compound core wall structure of earth and rockfill dam, reducing the influence that the environment was filled out asphalt concrete core wall or clay core wall, promoting the life-span and the stability of earth and rockfill dam prevention of seepage system.
In order to realize the above object of the present invention, the following technical solutions are provided:
an earth and rockfill dam composite core wall structure comprising: a centrally filled base core having a core foundation at the bottom thereof; a HDPE membrane sheet in intimate contact with the upstream face of the base core; wherein prior to filling said base core, said HDPE film sheets are placed on the upstream side of the base core and embedded at the bottom thereof in said core foundation.
Preferably, the basic core is an asphalt concrete core, and the HDPE membrane is tightly attached to the asphalt concrete core by coating a cationic asphalt paint on the downstream side of the HDPE membrane.
Preferably, the HDPE film sheet is a HDPE film sheet with enhanced heat resistance.
Alternatively, preferably, the base core is a clay core and the HDPE membrane is attached to the clay core by applying a clay slurry coating to the downstream surface of the HDPE membrane.
Preferably, the HDPE film extensions are overlapped by heat welding or gluing.
Preferably, the top of the HDPE membrane is connected with a dam top wave-proof facility.
The beneficial effects of the utility model are embodied in the following aspect:
1) the utility model adopts the composite structure of HDPE film and asphalt concrete core wall or clay core wall, which can greatly improve the anti-seepage performance of asphalt concrete core wall or clay core wall, and can better compensate the crack defect possibly generated by asphalt concrete core wall or clay core wall, improve the stability and durability of anti-seepage system of earth and rockfill dam, and reduce the engineering investment and operation cost on the whole;
2) the utility model discloses a use of HDPE diaphragm reduces the use of materials such as asphalt concrete, clay and anti-filter material in the construction of earth and rockfill dam to a certain extent, reduce cost.
Drawings
Fig. 1 is a schematic structural view of a first embodiment of the composite core wall structure of an earth and rockfill dam of the present invention;
FIG. 2 is a construction flow chart of a first embodiment of the composite core wall structure of an earth and rockfill dam of the present invention;
fig. 3 is a schematic structural view of a second embodiment of the earth and rockfill dam composite core wall structure of the present invention;
fig. 4 is a construction flow chart of the second embodiment of the composite core wall structure of earth and rockfill dam of the present invention.
Description of reference numerals: 1-HDPE film; 21-asphalt concrete core wall; 31-concrete core wall foundation; 41-cationic asphalt paint coating; 51-an upstream transition layer; 61-a downstream transition layer; 71-upstream dam; 81-downstream dam; 22-clay core wall; 32-clay core wall foundations; 42-clay mud coating; 52-an upstream transition layer; 62-downstream backwash layer; 72-upstream dam; 82-downstream dam body; 9-shaping the template; 10-impervious curtain; 1 a-the bottom anchor end of the HDPE membrane.
Detailed Description
The utility model provides a compound core wall structure of earth and rockfill dam, include: a centrally filled base core; an HDPE membrane sheet 1 in close proximity to the upstream face of the base core.
The utility model discloses the HDPE membrane that will have good characteristics in the aspect of the prevention of seepage combines together with current earth and rockfill dam core wall material, can widen the application range of local damming material, reduces the influence that the environment was filled to earth and rockfill dam core wall, and then wholly strengthens earth and rockfill dam overall construction quality, promotes the life-span and the stability of earth and rockfill dam prevention of seepage system.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example one
The basic core in this embodiment is an asphalt concrete core 21.
As shown in fig. 1, the present embodiment provides an embankment dam HDPE film and asphalt concrete composite core wall structure, comprising: a centrally filled asphalt concrete core 21; HDPE membrane 1 is closely attached to the upstream face of asphalt concrete core 21.
In the embodiment, the downstream surface of the HDPE film 1 is coated with the cationic asphalt paint 41 to achieve close contact with the asphalt concrete core 21. And the HDPE film sheet 1 of the present embodiment is a HDPE film sheet with enhanced heat resistance.
The embodiment also provides a construction method of the HDPE film and asphalt concrete composite core wall, which comprises the following steps:
1. calculating and checking the structure of the HDPE film and asphalt concrete core earth-rock dam in the design stage to form a design drawing of the dam;
in the construction stage, excavation and seepage-proofing treatment are carried out on the foundation, and a concrete core wall foundation 31 is formed; during or after the construction of the concrete core wall foundation 31, arranging the HDPE membrane 1 at the upstream side of the asphalt concrete core wall 21 to be filled, embedding the bottom anchor of the HDPE membrane 1 into the concrete core wall foundation 31, and coating a cationic asphalt paint coating on the concrete core wall foundation 31 for surface treatment;
the requirement that the bottom anchor of the HDPE membrane 1 is embedded into the concrete core wall foundation 31 is that the bottom of the HDPE membrane 1 is connected with the concrete core wall foundation 31 into a whole. Firstly, paving and fixing the bottom of the HDPE membrane to a reinforcing mesh, and then pouring and anchoring the HDPE membrane and the reinforcing mesh together to be embedded in the concrete core wall foundation; and the other mode is that firstly, the HDPE concrete connecting lock is pre-embedded into the concrete core wall foundation and then is welded and connected with the HDPE membrane.
2. An asphalt concrete core 21 is filled in the center. In the embodiment, a construction process of laying the asphalt material by a vertical mold method or a vertical mold method is adopted.
Wherein the asphalt concrete core 21 is filled up in sections. As shown in fig. 2, the filling method of each ascending section is as follows:
a. installing a shaping template 9 at the position of the filled asphalt concrete core wall;
b. pouring or distributing asphalt concrete in the shaping template 9;
c. enabling the HDPE membrane 1 to abut against the shaping template, and sequentially distributing an upstream transition layer 51, a downstream transition layer 61, an upstream dam body 71 and a downstream dam body 81 which are respectively positioned on the upper and the downstream of the asphalt concrete core wall 21;
before the HDPE membrane 1 is abutted against the shaping template, a layer of cationic asphalt paint is uniformly coated on the downstream surface of the HDPE membrane 1 for strengthening the close fit between the HDPE membrane and the asphalt concrete core wall and reducing the influence of asphalt concrete at higher temperature on the HDPE membrane;
d. moving out the shaping template, rolling the asphalt concrete core wall firstly, and then sequentially rolling the upstream transition layer, the downstream transition layer, the upstream dam body and the downstream dam body according to the normal sequence of the prior art to ensure that the HDPE membrane 1 is tightly attached to the upstream surface of the asphalt concrete core wall;
the HDPE diaphragm is required to be tightly attached to the upstream transition layer 51 on the upstream side and the asphalt concrete core wall 21 on the downstream side in the installation process, gaps are reduced as much as possible, the HDPE diaphragm cannot be folded, and the filling parameters of the upstream transition layer 51, the downstream transition layer 61, the upstream dam body 71, the downstream dam body 81 and the asphalt concrete core wall 21 are determined by the existing standard or field test;
in practice, the HDPE film is selected to have a thickness of at least 1.5mm according to calculation, and a double-rough-surface HDPE film is adopted to realize better combination with the upstream transition layer 51 and the asphalt concrete core wall 21.
e. The HDPE membrane 1 extends along with the upward filling of the asphalt concrete core wall 21;
wherein, HDPE diaphragm 1 upwards fills up and upwards extends with the bank slope along with asphalt concrete core 21 when, adopts hot melt welding or sticky overlap joint and detects qualified, and the breadth height will make things convenient for the filling construction, and the shape and size of special places HDPE diaphragm such as toe cuts out on-the-spot as required.
3. Constructing to the top of the dam circularly according to the step 2, and anchoring the top of the HDPE membrane and the wave-proof facility 100 to form a composite system;
wherein, the HDPE membrane can be anchored and embedded with the concrete of the top wave-proof facility 100 or bonded with the concrete of the wave-proof facility 100 by adopting special glue.
The width of upstream transition layer 51 and asphalt concrete core 21 thickness are rationally optimized through the use of HDPE membrane to this embodiment, optimize dam structural design, can reduce engineering cost to a certain extent.
Example two
The base core in this embodiment is a clay core 22.
As shown in fig. 3, the present example provides an embankment dam HDPE film and clay composite core wall structure, comprising: a centrally filled clay core 22; HDPE membrane sheet 1 in close proximity to the upstream face of clay core 22.
In this embodiment, the downstream surface of the HDPE membrane 1 is coated with a clay slurry coating 42 to achieve a close fit with the clay core 22. The HDPE membrane 1 of this example is a standard HDPE membrane.
The embodiment also provides a construction method of the HDPE film and clay composite core wall, which comprises the following steps:
1. calculating and checking the HDPE film and the clay core earth-rock dam structure in the design stage to form a design drawing of the dam;
in the construction stage, excavation and seepage-proofing treatment are carried out on the foundation, and a clay core wall foundation 32 is formed; wherein, in the construction process of the clay core foundation 32, the HDPE membrane 1 is arranged at the upstream side of the clay core 22 to be filled and the bottom of the HDPE membrane 1 is embedded into the clay core foundation 32;
the bottom of the HDPE membrane 1 is embedded into the clay core wall foundation 32 in a mode that the bottom of the HDPE membrane is folded and pressed into a viscous soil body.
2. The clay core 22 is centrally filled.
Wherein the clay core 22 is filled up in sections. As shown in fig. 4, the filling method of each ascending section is as follows:
a. mechanical material distribution is carried out on the part where the clay core wall is filled according to the conventional method, and the material distribution is carried out on the downstream inverted filter layer 62 and the downstream dam body 82 which are positioned at the downstream of the clay core wall 22 according to the requirement;
b. the clay core wall 22, the downstream inverted filter layer 62 and the downstream dam 82 are rolled in sequence to be qualified;
c. repairing a slope of the upstream surface of the rolled clay core wall, and uniformly coating a clay slurry coating on the downstream surface of the cleaned HDPE membrane 1;
wherein, a layer of clay slurry coating is uniformly coated on the downstream surface of the HDPE membrane 1 and is used for strengthening the close fit between the HDPE membrane and the clay core wall;
d. sequentially distributing and rolling an upstream transition layer 52 and an upstream dam body 72 positioned at the upstream of the clay core wall 22 to ensure that the HDPE membrane 1 is tightly attached to the upstream surface of the clay core wall;
wherein, the HDPE membrane is required to be tightly attached to the upstream transition layer 52 on the upstream side and the clay core wall 22 on the downstream side in the installation process, gaps are reduced as much as possible, the HDPE membrane cannot be folded, and the filling parameters of the upstream transition layer 52, the downstream inverted filter layer 62, the upstream dam body 72, the downstream dam body 82 and the clay core wall 22 are determined by the existing standard or field test;
in practice, the HDPE films are selected by calculation to be at least 1.5mm thick and a double-roughened HDPE film is used to achieve better bonding with the upstream transition layer 52 and the clay core 22.
e. The HDPE membrane 1 extends with the clay core wall 22 filled upwards;
wherein, HDPE diaphragm 1 upwards fills and upwards extends with the bank slope along with clay heart wall 22, adopts hot melt welding or sticky overlap joint and detects qualified, and the breadth height will make things convenient for the filling construction, and the shape size of special places HDPE diaphragm such as toe cuts out on-the-spot as required.
3. Constructing to the top of the dam circularly according to the step 2, and anchoring the top of the HDPE membrane and the wave-proof facility 100 to form a composite system;
wherein, the HDPE membrane can be anchored and embedded with the concrete of the top wave-proof facility 100 or bonded with the concrete of the wave-proof facility 100 by adopting special glue.
The upstream transition layer 52 can replace the traditional upstream reverse filtration layer through the use of the HDPE film, the width of the clay core wall is optimized, the structural design of the dam is optimized, and the engineering cost can be reduced to a certain extent.
The utility model has the advantages that, adopted the composite construction of HDPE membrane and asphalt concrete core or clay core, the seepage prevention nature of promotion asphalt concrete core or clay core that can be very big can better compensate the crack defect that asphalt concrete core or clay core probably produced simultaneously, improves earth and rockfill dam seepage prevention system's stability and durability, has the effect that reduces engineering investment and working costs on the whole.
The utility model belongs to the application scope of the similar composite construction such as difference to other HDPE diaphragms, coating material types, detail processing that use multilayer structure.
Although the above is the detailed description of the present invention, the present invention is not limited thereto, and those skilled in the art can modify the principle of the present invention, therefore, various modifications performed according to the principle of the present invention should be understood as falling into the protection scope of the present invention.
Claims (6)
1. An earth and rockfill dam composite core wall structure comprising: basic core wall of filling between two parties, its bottom has the core wall basis, its characterized in that still includes:
a HDPE membrane sheet in intimate contact with the upstream face of the base core;
wherein prior to filling said base core, said HDPE film sheets are placed on the upstream side of the base core and embedded at the bottom thereof in said core foundation.
2. The earth and rock dam composite core wall structure of claim 1, wherein said primary core wall is an asphalt concrete core wall, and said HDPE membrane is tightly adhered to said asphalt concrete core wall by painting a cationic asphalt paint on a downstream surface thereof.
3. The earth and rock dam composite core wall structure of claim 2, wherein the HDPE membrane is an HDPE membrane having enhanced heat resistance.
4. The earth and rock dam composite core wall structure as recited in claim 1, wherein said primary core wall is a clay core wall, and said HDPE film sheets are intimately attached to said clay core wall by applying a clay slurry coating on the downstream side thereof.
5. An earth and rock dam composite core wall structure as claimed in claim 3 or 4, wherein the HDPE membrane extensions are lap welded or glued using heat.
6. The earth and rock dam composite core wall structure of claim 5, wherein the top of the HDPE membrane is connected to a wave protection device at the top of the dam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920185955.7U CN209816797U (en) | 2019-02-11 | 2019-02-11 | Earth-rock dam composite core wall structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920185955.7U CN209816797U (en) | 2019-02-11 | 2019-02-11 | Earth-rock dam composite core wall structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110004883A (en) * | 2019-02-11 | 2019-07-12 | 中国水电基础局有限公司 | A kind of compound core-wall structure of earth and rockfill dam and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110004883A (en) * | 2019-02-11 | 2019-07-12 | 中国水电基础局有限公司 | A kind of compound core-wall structure of earth and rockfill dam and construction method |
| CN110004883B (en) * | 2019-02-11 | 2024-03-26 | 中国水电基础局有限公司 | Composite core wall structure of earth-rock dam and construction method |
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