CN113897984A - Connection type of impervious wall concrete cap and geomembrane and construction method thereof - Google Patents
Connection type of impervious wall concrete cap and geomembrane and construction method thereof Download PDFInfo
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- CN113897984A CN113897984A CN202111153848.4A CN202111153848A CN113897984A CN 113897984 A CN113897984 A CN 113897984A CN 202111153848 A CN202111153848 A CN 202111153848A CN 113897984 A CN113897984 A CN 113897984A
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- concrete
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- cap
- groove
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- 239000002131 composite material Substances 0.000 claims abstract description 46
- 239000010426 asphalt Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004873 anchoring Methods 0.000 claims abstract description 5
- 230000001680 brushing effect Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- 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
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
- E02D19/185—Joints between sheets constituting the sealing aprons
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The invention discloses a connection type of a concrete cap of a cut-off wall and a geomembrane and a construction method thereof, which comprises the steps of determining the position of the concrete cut-off wall; filling construction platforms on two sides of the position of the concrete impervious wall; pouring concrete guide walls on the construction platform along two sides of the center line of the concrete impervious wall; grooving holes in the concrete guide wall, and pouring the concrete impervious wall, wherein the top of the concrete impervious wall is flush with the construction platform; chiseling concrete in a chiseling area at the top of the water facing side of the concrete impervious wall to form a groove with a right-angled trapezoid cross section; brushing asphalt on the inner bottom wall and the right side wall of the groove, and pasting the composite geomembrane on an asphalt layer; anchoring the composite geomembrane on the bottom wall of the groove by using an anchor bolt, and upwards extending the composite geomembrane on the right side wall in the groove to keep vertical and fix; concrete is poured on two sides of the composite geomembrane to form a concrete cap, and the tail end of the composite geomembrane extends out of the top of the concrete cap. The invention has good water-stopping and seepage-proofing effects, convenient construction and lower engineering investment cost.
Description
Technical Field
The invention relates to the technical field of cofferdam construction of hydraulic engineering, in particular to a connection type of a concrete cover cap and a geomembrane of an impervious wall and a construction method thereof.
Background
In water conservancy and hydropower engineering, the earth-rock cofferdam is generally divided into an underwater throwing filling part and an above-water rolling part, the underwater throwing filling part and a covering layer are generally impervious by using concrete impervious walls, the above impervious walls are generally impervious by using composite geomembranes, and the impervious walls are connected with the composite geomembranes through concrete caps.
Because the concrete of the impervious wall is poured underwater in the early stage, the concrete cap is poured in the later stage in a normal state, the concrete cap is always in an eccentric stress state due to the water pressure, the self weight of the weir body filler and the extrusion effect caused by the poisson effect, the joint of the concrete cap and the impervious wall is easy to stretch and separate or shear and slide to form a concentrated leakage channel, and meanwhile, the joint surface between the concrete cap and the impervious wall and the guide wall is easy to form the leakage channel to cause water leakage and water seepage.
Disclosure of Invention
The invention aims to provide a connection type of a concrete cover cap of an impervious wall and a geomembrane and a construction method thereof, which have the advantages of good water-stopping and seepage-proofing effects, convenient construction and lower engineering investment cost.
The invention provides a construction method for connecting a concrete cap of an impervious wall and a geomembrane, which comprises the following steps:
step 1: determining the position of the concrete impervious wall;
step 2: filling construction platforms on two sides of the position of the concrete impervious wall;
and step 3: pouring concrete guide walls on the construction platform along two sides of the center line of the concrete impervious wall;
and 4, step 4: grooving holes in the concrete guide wall, and pouring the concrete impervious wall, wherein the top of the concrete impervious wall is flush with the construction platform;
and 5: chiseling concrete in a chiseling area at the top of the water facing side of the concrete impervious wall to form a groove with a right-angled trapezoid cross section;
step 6: brushing asphalt on the inner bottom wall and the right side wall of the groove, and pasting the composite geomembrane on an asphalt layer;
and 7: anchoring the composite geomembrane on the bottom wall of the groove by using an anchor bolt, and upwards extending the composite geomembrane on the right side wall in the groove to keep vertical and fix;
and 8: concrete is poured on two sides of the composite geomembrane to form a concrete cap, and the tail end of the composite geomembrane extends out of the top of the concrete cap.
Further, the thickness of the chiseling area is half of that of the concrete impervious wall, and the depth is 0.5 m.
Further, the composite geomembrane is arranged along the center line of the concrete impervious wall in the vertical direction, and the length of the composite geomembrane extending out of the top end of the concrete cap is not less than 1 m.
The invention also provides a connection type of the concrete cap and the geomembrane of the impervious wall, which comprises a construction platform, a concrete guide wall, the concrete impervious wall, a chiseling area, a composite geomembrane and the concrete cap, wherein the concrete impervious wall is positioned below the construction platform, the concrete guide wall is positioned above the construction platform and symmetrically arranged along the central line of the concrete impervious wall, the chiseling area is positioned at the top of the water facing side of the concrete impervious wall and is a groove with a right trapezoid cross section, the bottom wall and the right side wall in the groove are provided with asphalt layers, the composite geomembrane is covered on the asphalt layers, the composite geomembrane is anchored at the bottom wall in the groove through anchor bolts and vertically extends upwards along the right side wall in the groove, the concrete cap is poured along the two sides of the composite geomembrane, and the composite geomembrane extends out of the top end of the concrete cap to form a closed impervious body.
Furthermore, the concrete impervious wall is thick at the top and thin at the bottom, and the top end of the concrete impervious wall is flush with the construction platform.
Furthermore, the distance between the two concrete guide walls is the thickness of the upper end of the concrete impervious wall.
Further, the concrete block is connected with the concrete guide wall clamping groove.
Further, the concrete guide wall includes horizontal part and vertical portion, and vertical portion cross-section is right trapezoid, and right trapezoid hypotenuse is located upstream face one side, and horizontal part lateral surface protrusion in concrete cap lateral surface.
Further, the anchor bolt is M16 model.
The invention has the beneficial effects that:
(1) the invention reduces the water seepage probability of the connecting surface between the concrete cap and the top of the concrete diaphragm wall and improves the anti-seepage effect of the cofferdam.
(2) The invention does not need to separately arrange rubber water stop between the impervious wall and the concrete cap, thereby saving the engineering investment.
(3) The invention adopts an anchor bolt and embedded composite geomembrane anchoring mode, and improves the connection stability of the composite geomembrane and the concrete cover cap.
(4) The construction method is simple and easy to popularize.
Drawings
Fig. 1 is a schematic structural diagram of a connection type of a impervious wall concrete cap and a geomembrane.
Fig. 2 is a flow chart of a construction method of a connection type of a impervious wall concrete cap and a geomembrane.
The labels in the figure are: a construction platform 1; a concrete guide wall 2; a concrete impervious wall 3; a chiseling area 4; a composite geomembrane 5; 6, asphalt; an anchor bolt 7; a concrete cap 8; a water-facing surface 9; a water-backed surface 10.
Detailed Description
The present invention will be further described with reference to the structures or terms used herein. The description is given for the sake of example only, to illustrate how the invention may be implemented, and does not constitute any limitation on the invention.
The invention provides a connection type of a concrete cap and a geomembrane of an impervious wall, which comprises a construction platform 1, a concrete guide wall 2, a concrete impervious wall 3, a chiseling area 4, a composite geomembrane 5, asphalt 6, an anchor bolt 7 and a concrete cap 8 as shown in figure 1. The concrete impervious wall 3 is positioned below the construction platform 1. Two concrete guide walls 2 are symmetrically arranged above the construction platform 1 along the central line of the concrete impervious wall 3, and the distance between the two concrete guide walls is the thickness of the upper end of the concrete impervious wall 3. The concrete impervious wall 3 is thick at the top and thin at the bottom, and the top end of the concrete impervious wall is flush with the construction platform 1.
Referring to fig. 1, the left side of the concrete cut-off wall 3 is an upstream surface 9, and the right side thereof is a downstream surface 10.
The chiseling area 4 is positioned at the top of the upstream surface 9 of the concrete impervious wall 3 and is a groove with a right trapezoid cross section, the thickness of the chiseling area is half of that of the concrete impervious wall 3, and the depth of the chiseling area is 0.5 m.
The bottom wall and the right side wall in the groove are provided with the asphalt layer 6, and the composite geomembrane 5 covers the asphalt layer 6 to increase the bonding strength.
The composite geomembrane 5 is anchored to the bottom wall in the groove through an anchor bolt 7 with the model M16, the firm strength is increased, the anchor bolt vertically extends upwards along the right side wall in the groove, and a concrete cover cap 8 is poured along the two sides of the composite geomembrane 5 to fill the grooves of the chiseled-off areas 4. That is to say, concrete block 8 is connected with concrete cut-off wall 3 top, is connected with concrete guide wall 2 draw-in groove simultaneously, and the draw-in groove is connected and is prevented concrete block 8 and slide.
The composite geomembrane 5 is vertically arranged along the center line of the concrete impervious wall 3, and the length of the composite geomembrane extending out of the top end of the concrete cap 8 is not less than 1m, so that a closed impervious body is formed.
The invention also provides a construction method of the connection type of the impervious wall concrete cap and the geomembrane, as shown in figure 2, comprising the following steps:
step 1: determining the position of the concrete impervious wall 3;
step 2: filling construction platforms 1 on two sides of the position of the concrete impervious wall 3;
and step 3: pouring concrete guide walls 2 along two sides of the center line of the concrete impervious wall 3 on the construction platform 1;
and 4, step 4: a groove hole is formed in the concrete guide wall 2, a concrete impervious wall 3 is poured, and the top of the concrete impervious wall is flush with the construction platform 1;
and 5: within 24 hours after the concrete impervious wall 3 is poured, chiseling the concrete in the chiseling area 4 at the top of the water-facing surface 9 side of the concrete impervious wall 3 to form a groove with a right-angled trapezoid cross section, wherein the thickness of the groove is half of the thickness of the concrete impervious wall 3, and the depth of the groove is 0.5 m;
step 6: brushing asphalt on the inner bottom wall and the right side wall of the groove, stripping geotextiles on two sides of the composite geomembrane 5, and then sticking the composite geomembrane 5 on the asphalt layer 6;
and 7: anchoring the composite geomembrane 5 on the inner bottom wall of the groove by using an anchor bolt 7 with the model number of M6;
and 8: extending the composite geomembrane 5 on the right side wall of the groove in the step 7 upwards, keeping the composite geomembrane vertical and fixing;
and step 9: concrete is poured on two sides of the composite geomembrane 5 to form a concrete cap 8, and the tail end of the composite geomembrane 5 extends out of the top of the concrete cap 8 by a length not less than 1 m.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.
Claims (9)
1. A construction method for a connection type of a concrete block of an impervious wall and a geomembrane is characterized by comprising the following steps:
step 1: determining the position of the concrete impervious wall (3);
step 2: filling construction platforms (1) on two sides of the position of the concrete impervious wall (3);
and step 3: pouring concrete guide walls (2) on the construction platform (1) along two sides of the center line of the concrete impervious wall (3);
and 4, step 4: grooving holes in the concrete guide wall (2), and pouring the concrete impervious wall (3), wherein the top of the concrete impervious wall is flush with the construction platform (1);
and 5: chiseling concrete in a chiseling area (4) at the top of one side, facing the water surface (9), of the concrete impervious wall (3) to form a groove with a right-angled trapezoid cross section;
step 6: brushing asphalt on the inner bottom wall and the right side wall of the groove, and sticking the composite geomembrane (5) on the asphalt layer (6);
and 7: anchoring the composite geomembrane (5) on the inner bottom wall of the groove by using an anchor bolt (7), and upwards extending the composite geomembrane (5) on the right side wall in the groove to keep vertical and fix;
and 8: concrete is poured on two sides of the composite geomembrane (5) to form a concrete cap (8), and the tail end of the composite geomembrane (5) extends out of the top of the concrete cap (8).
2. Construction method according to claim 1, characterised in that the chiseling area (4) has a thickness of half the thickness of the concrete diaphragm wall (3) and a depth of 0.5 m.
3. The construction method according to claim 1, wherein the composite geomembrane (5) is vertically arranged along the center line of the concrete impervious wall (3) and extends out of the top end of the concrete cap (8) by a length of not less than 1 m.
4. A connection type of a concrete cap and a geomembrane of a cut-off wall is characterized by comprising a construction platform (1), a concrete guide wall (2), a concrete cut-off wall (3), a chiseling area (4), a composite geomembrane (5) and the concrete cap (8) as claimed in claims 1 to 3, wherein the concrete cut-off wall (3) is positioned below the construction platform (1), the concrete guide wall (2) is positioned above the construction platform (1) and symmetrically arranged along the central line of the concrete cut-off wall (3), the chiseling area (4) is positioned at the top of one side of a water facing surface (9) of the concrete cut-off wall (3) and is a groove with a right trapezoid cross section, the groove inner bottom wall and the right side wall are provided with an asphalt layer (6), the composite geomembrane (5) covers the asphalt layer (6), the composite geomembrane (5) is anchored at the groove inner bottom wall through an anchor bolt (7) and vertically extends upwards along the groove right side wall, the concrete caps (8) are poured along the two sides of the composite geomembrane (5), and the composite geomembrane (5) extends out of the top ends of the concrete caps (8) to form a closed anti-seepage body.
5. A kind of diaphragm wall concrete block and geomembrane connection type according to claim 4, characterized in that, the concrete diaphragm wall (3) is thick at the top and thin at the bottom, and its top is flush with the construction platform (1).
6. A kind of connection type of impervious wall concrete cap and geomembrane as claimed in claim 4, characterized in that, the distance between two concrete guide walls (2) is the thickness of the upper end of the concrete impervious wall (3).
7. A kind of diaphragm wall concrete block and geomembrane connection type according to claim 4, characterized in that, the concrete block (8) is connected with the concrete guide wall (2) neck.
8. The connection type of the concrete cap and the geomembrane of the impervious wall according to claim 4, wherein the concrete guide wall (2) comprises a horizontal part and a vertical part, the section of the vertical part is in a right trapezoid shape, the inclined edge of the right trapezoid is positioned on the side facing the water surface (9), and the outer side surface of the horizontal part protrudes out of the outer side surface of the concrete cap (8).
9. A type of connection of a concrete diaphragm cap with a geomembrane according to claim 4, wherein the anchor bolt (7) is M16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111153848.4A CN113897984A (en) | 2021-09-29 | 2021-09-29 | Connection type of impervious wall concrete cap and geomembrane and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111153848.4A CN113897984A (en) | 2021-09-29 | 2021-09-29 | Connection type of impervious wall concrete cap and geomembrane and construction method thereof |
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| CN113897984A true CN113897984A (en) | 2022-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111153848.4A Pending CN113897984A (en) | 2021-09-29 | 2021-09-29 | Connection type of impervious wall concrete cap and geomembrane and construction method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001064985A (en) * | 1999-08-26 | 2001-03-13 | Nabco System Kk | Retaining wall work method and retaining wall structure for preparation or building site of the like |
| CN105951857A (en) * | 2016-06-27 | 2016-09-21 | 中国电建集团成都勘测设计研究院有限公司 | Composite anti-seepage wall used in hydraulic cofferdam engineering and construction method thereof |
| CN110158542A (en) * | 2019-06-17 | 2019-08-23 | 中国电建集团华东勘测设计研究院有限公司 | The Lossless connection structure and construction method of cut-pff wall and nut cap concrete |
-
2021
- 2021-09-29 CN CN202111153848.4A patent/CN113897984A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001064985A (en) * | 1999-08-26 | 2001-03-13 | Nabco System Kk | Retaining wall work method and retaining wall structure for preparation or building site of the like |
| CN105951857A (en) * | 2016-06-27 | 2016-09-21 | 中国电建集团成都勘测设计研究院有限公司 | Composite anti-seepage wall used in hydraulic cofferdam engineering and construction method thereof |
| CN110158542A (en) * | 2019-06-17 | 2019-08-23 | 中国电建集团华东勘测设计研究院有限公司 | The Lossless connection structure and construction method of cut-pff wall and nut cap concrete |
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Application publication date: 20220107 |