CN110761307B - Earth-rock cofferdam water seepage treatment structure and construction method - Google Patents
Earth-rock cofferdam water seepage treatment structure and construction method Download PDFInfo
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- CN110761307B CN110761307B CN201910969622.8A CN201910969622A CN110761307B CN 110761307 B CN110761307 B CN 110761307B CN 201910969622 A CN201910969622 A CN 201910969622A CN 110761307 B CN110761307 B CN 110761307B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
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Abstract
A water seepage processing structure of an earth-rock cofferdam comprises a closure dike, wherein a sub cofferdam is arranged at the position of a downstream slope foot of the closure dike, underwater concrete is poured on a river bed between the sub cofferdam and the closure dike, and a clay core wall is filled above the underwater concrete. The construction method of the water seepage treatment structure comprises the following steps: 1) filling the prop dam: adopting a one-way single prop vertical plugging method to fill the dike; 2) closing the cofferdam: building a sub cofferdam at the position of a downstream slope toe of the closure prop bank, and pouring underwater concrete on a river bed between the sub cofferdam and the closure prop bank; 3) laying a drain pipe: laying a plurality of drainage pipes along the direction of a riverbed above the underwater concrete, and draining the seepage water in the weir body; 4) filling a clay core wall: and filling a clay core wall above the underwater concrete, and filling an inverted filter layer on the two sides of the upstream and downstream of the clay core wall. By adopting the structure and the construction method, the anti-seepage effect can be improved after the cofferdam is closed on the riverbed, the water seepage of the weir body is effectively reduced, and the frequent drainage cost is reduced.
Description
Technical Field
The invention relates to the technical field of hydropower station closure construction, in particular to an earth-rock cofferdam water seepage treatment structure and a construction method.
Background
In the construction of water conservancy and hydropower engineering in high mountain canyon areas, a construction method of diversion tunnel diversion and river bed one-time interception is generally adopted. Before the dam construction, the construction of upstream and downstream cofferdams needs to be carried out, and the dam construction in dry land is guaranteed. The key problem of cofferdam construction is seepage prevention treatment, and seepage prevention parts mainly comprise a contact surface of a weir body and a river bed, a contact surface of the weir body and a bank slope and the like. The method of clay inclined wall seepage control, clay core wall seepage control and the like is generally adopted, but the two seepage control methods have the following defects:
1. the stacking phenomenon of stones exists in the cofferdam weir body, so that a leakage channel is easy to form;
the cofferdam generally needs to be constructed underwater, and the underwater condition is difficult to find. In the construction of the cofferdam and the dike, the dike meets the uneven foundation section. The connection of the stones in the filled cofferdam stones and the rugged foundation can form stone stacking phenomenon to form a leakage channel; particularly, larger stones are required to be used for closure at the closure opening, so that the possibility of forming a leakage channel is high, water seepage is high, and the cofferdam is difficult to close.
2. The position of a cofferdam weir body leakage channel cannot be accurately judged, and a targeted measure is difficult to take;
after the weir body is filled, the slope angle of the upstream surface of the weir body is basically below the water surface, the leakage channel is difficult to find, and even if the upstream surface is filled with clay for plugging, the leakage channel still hidden in the weir body cannot take corresponding countermeasures, and the treatment effect is poor.
3. The frequent drainage cost is increased, the equipment investment is large, and the engineering cost is increased;
after the cofferdam is filled, the water seepage phenomenon exists in the cofferdam under the common condition, if the seepage-proofing effect is poor, the frequent water discharge in the foundation pit is large, the equipment investment is large, and the water discharge cost is correspondingly increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing an earth-rock cofferdam water seepage treatment structure and a construction method, which can improve the seepage prevention effect, effectively reduce the water seepage of a weir body and reduce the frequent drainage cost after the cofferdam on a riverbed is closed.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides an earth-rock cofferdam infiltration processing structure, includes closure dike, characterized by: the closure hip is characterized in that a sub cofferdam is arranged at the downstream toe position of the closure hip, underwater concrete is poured on a riverbed between the sub cofferdam and the closure hip, and a clay core wall is filled above the underwater concrete.
In a preferable scheme, a plurality of drainage pipes along the direction of the riverbed penetrate through the clay core wall at a position close to the bottom, and the drainage pipes are communicated with the lower reaches of the clay core wall.
In a preferred scheme, a flange plate is arranged at one end of the drain pipe positioned at the downstream.
In a preferred scheme, reverse filtering layers are arranged on the two sides of the upstream and downstream of the clay core wall.
In the preferred scheme, underwater cast-fill stone slag, underwater cast-fill clay and slope protection block stones are sequentially filled on the upstream slope surface of the closure dike from bottom to top, and underwater cast-fill clay is filled between the downstream slope surface of the closure dike and a clay core wall.
A construction method of an earth-rock cofferdam water seepage processing structure comprises the following steps:
1) dam filling
Adopting a one-way single prop vertical plugging method to fill the dike;
2) cofferdam airtight device
Building a sub cofferdam at the downstream toe position of the closure prop bank, and pouring underwater concrete on a river bed between the sub cofferdam and the closure prop bank by using a conduit method until the underwater concrete is flush with the top surface of the sub cofferdam;
3) laying of drainage pipes
After the strength of the poured underwater concrete reaches the standard, laying a plurality of drainage pipes along the direction of the riverbed above the underwater concrete, and draining the seepage water in the weir body;
4) clay core wall filling
And filling a clay core wall above the underwater concrete, and filling an inverted filter layer on the two sides of the upstream and downstream of the clay core wall.
In the preferable scheme, in the step 1), after the closure embankment is filled, underwater cast-fill stone slag, underwater cast-fill clay and slope protection block stones are sequentially filled on the upstream slope surface of the closure embankment.
In a preferred embodiment, in the step 4), after the completion of the filling of the inverted filter layer, the downstream end of the drain pipe is blocked by using a flange.
In the preferable scheme, after the drainage pipe is plugged, underwater throwing and filling clay is filled in the area between the downstream slope surface of the closure dike and the clay core wall.
In a preferable scheme, in the step 3), after the drainage pipe is laid, the sub cofferdams are continuously heightened to be consistent with the upstream horizontal plane of the cut-off hip dike.
The earth-rock cofferdam water seepage treatment structure and the construction method provided by the invention have the following beneficial effects by adopting the structure and the method:
(1) the construction is simple, the cost is low, the water seepage problem of the cofferdam is effectively solved, and the purpose of closing the air of the cofferdam is achieved;
(2) the frequent drainage cost is reduced, the labor can be effectively saved, the equipment investment is reduced, and the cost is saved;
(3) the construction speed is high, and the working efficiency is greatly improved;
(4) the main body construction is carried out in dry land, and the engineering quality is guaranteed;
(5) the treatment effect of the weir body water seepage problem is obvious.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is an overall cross-sectional view of the present invention.
Fig. 2 is an elevation view of a clay core of the present invention.
Fig. 3 is a top view of a clay core of the present invention.
In the figure: the underwater concrete dam comprises a closure prop dike 1, a sub cofferdam 2, underwater concrete 3, a flange plate 4, a drain pipe 5, a clay core wall 6, a reverse filtering layer 7, underwater cast-fill stone slag 8, underwater cast-fill clay 9 and slope protection block stones 10.
Detailed Description
Example 1:
as shown in fig. 1-3, the earth-rock cofferdam water seepage processing structure comprises a closure dike 1, wherein a sub cofferdam 2 is arranged at the downstream toe position of the closure dike 1, underwater concrete 3 is poured on a river bed between the sub cofferdam 2 and the closure dike 1, and a clay core wall 6 is filled above the underwater concrete 3.
In a preferred scheme, a plurality of drainage pipes 5 along the direction of the river bed are arranged on the clay core wall 6 at a position close to the bottom in a penetrating way, and the drainage pipes 5 are communicated with the upstream and the downstream of the clay core wall 6.
In a preferred scheme, a flange plate 4 is arranged at one end of the drain pipe 5 positioned at the downstream.
The flange 4 plugs the drain pipe 5 after the seepage drainage operation in the sub cofferdam 2 is finished, so that the seepage of the slope of the upstream closure dike 1 into a construction area in the subsequent work is avoided.
In a preferred scheme, the upstream and downstream sides of the clay core wall 6 are provided with inverted filter layers 7.
In the preferred scheme, underwater cast-in-place stone slag 8, underwater cast-in-place clay 9 and slope protection block stones 10 are sequentially filled on the upstream slope surface of the closure dike 1 from bottom to top, and the underwater cast-in-place clay 9 is filled between the downstream slope surface of the closure dike 1 and the clay core wall 6.
Example 2:
as shown in fig. 1, a construction method of an earth-rock cofferdam water seepage treatment structure is characterized by comprising the following steps:
1) dam filling
Adopting a one-way single prop vertical plugging method to fill the dike;
2) cofferdam airtight device
Building a sub cofferdam 2 at the downstream toe position of the closure hip 1, and pouring underwater concrete 3 on the river bed between the sub cofferdam 2 and the closure hip 1 by using a conduit method until the underwater concrete is flush with the top surface of the sub cofferdam 2;
3) laying of drainage pipes
After the strength of the poured underwater concrete 3 reaches the standard, a plurality of drainage pipes 5 along the direction of the riverbed are laid above the underwater concrete 3, and water seepage in the weir body is discharged;
4) clay core wall filling
And a clay core wall 6 is filled above the underwater concrete 3, and an inverted filter layer 7 is filled on the two sides of the upstream and downstream of the clay core wall 6.
In the preferable scheme, in the step 1), after the closure dike 1 is filled, underwater cast-fill stone slag 8, underwater cast-fill clay 9 and slope protection block stones 10 are sequentially filled on the upstream slope surface of the closure dike 1.
In a preferred embodiment, in the step 4), after the completion of the filling of the inverted filter 7, the downstream end of the drain pipe 5 is sealed by a flange.
In the preferable scheme, after the drain pipe 5 is plugged, underwater clay 9 is filled in the area between the downstream slope surface of the closure dike 1 and the clay core wall 6.
In a preferable scheme, in the step 3), after the drain pipe 5 is laid, the sub-cofferdam 2 is continuously raised to be consistent with the upstream horizontal plane of the cut-off hip dam 1.
In a preferred embodiment, when the clay core wall 6 is filled, the upstream cofferdam is raised and thickened at the same time until the design size is reached.
By adopting the mode, the construction steps of the anti-seepage structure are simplified, the cost for arranging the anti-seepage structure is reduced, the water seepage problem of the cofferdam is effectively solved, and the aim of closing the air of the cofferdam is finally fulfilled; in practical application, the seepage-proofing efficiency of the seepage-proofing structure is greatly improved, so that main construction engineering is carried out in dry land, the engineering quality is guaranteed, and the manpower and material resource investment for frequent drainage is reduced.
Claims (8)
1. A construction method of an earth-rock cofferdam water seepage treatment structure is characterized by comprising the following steps: the earth-rock cofferdam water seepage processing structure comprises a closure dike (1), wherein a sub cofferdam (2) is arranged at the downstream toe position of the closure dike (1), underwater concrete (3) is poured on a river bed between the sub cofferdam (2) and the closure dike (1), and a clay core wall (6) is filled above the underwater concrete (3);
the construction method of the earth-rock cofferdam water seepage treatment structure comprises the following steps:
1) dam filling
Adopting a one-way single prop vertical plugging method to fill the dike;
2) cofferdam airtight device
Building a sub cofferdam (2) at the downstream toe position of the closure prop bank (1), and pouring underwater concrete (3) on the river bed between the sub cofferdam (2) and the closure prop bank (1) by using a conduit method until the underwater concrete is flush with the top surface of the sub cofferdam (2);
3) laying of drainage pipes
After the strength of the poured underwater concrete (3) reaches the standard, laying a plurality of drainage pipes (5) along the direction of the riverbed above the underwater concrete (3) to drain the water seepage in the closure dike (1);
4) clay core wall filling
And a clay core wall (6) is filled above the underwater concrete (3), and an inverted filter layer (7) is filled on the two sides of the upstream and downstream of the clay core wall (6).
2. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 1, characterized in that: the water drainage pipe (5) penetrates through the position, close to the bottom, of the clay core wall (6), and the water drainage pipe (5) is communicated with the upstream and the downstream of the clay core wall (6).
3. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 2, characterized in that: one end of the drain pipe (5) positioned at the downstream is provided with a flange plate (4).
4. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 1, characterized in that: underwater cast-filling stone slag materials (8), underwater cast-filling clay (9) and slope protection block stones (10) are sequentially filled on the upstream slope surface of the closure dike (1) from bottom to top, and the underwater cast-filling clay (9) is filled between the downstream slope surface of the closure dike (1) and the clay core wall (6).
5. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 1, characterized in that: in the step 1), after the closure dike (1) is filled, underwater cast-fill stone slag materials (8), underwater cast-fill clay (9) and slope protection block stones (10) are sequentially filled on the upstream slope surface of the closure dike (1).
6. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 1, characterized in that: and in the step 4), after the reverse filter layer (7) is filled, the downstream end of the drain pipe (5) is sealed by using a flange.
7. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 6, characterized in that: and after the drainage pipe (5) is plugged, filling underwater throwing and filling clay (9) in an area between the downstream slope surface of the closure dike (1) and the clay core wall (6).
8. The construction method of the earth-rock cofferdam water seepage treatment structure of claim 1, characterized in that: in the step 3), after the drain pipe (5) is laid, the sub cofferdam (2) is continuously heightened to be consistent with the upstream horizontal plane of the closure dike (1).
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| CN113529761B (en) * | 2020-04-22 | 2023-08-18 | 中国电建集团华东勘测设计研究院有限公司 | Cofferdam group structure with broken line type earth-rock cofferdam and construction method |
| CN113073665A (en) * | 2021-03-19 | 2021-07-06 | 中国葛洲坝集团市政工程有限公司 | Cofferdam dike dam filling and closure construction method |
| CN115450236A (en) * | 2022-09-15 | 2022-12-09 | 中国葛洲坝集团国际工程有限公司 | Cofferdam anti-seepage structure and construction method thereof |
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| CN104264698A (en) * | 2014-09-05 | 2015-01-07 | 中国葛洲坝集团国际工程有限公司 | Construction method of clay core earth rock cofferdam |
| JP6266821B2 (en) * | 2017-03-13 | 2018-01-24 | 五洋建設株式会社 | Deadline structure and deadline method |
| CN208201895U (en) * | 2018-05-09 | 2018-12-07 | 中建三局基础设施建设投资有限公司 | A kind of shallow water soft base jumbo bag cofferdam |
| CN208346835U (en) * | 2018-06-06 | 2019-01-08 | 中国葛洲坝集团基础工程有限公司 | Environmental type earth-rock cofferdam structure |
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