CN112195862A - Anti-seepage joint structure of geomembrane anti-seepage panel and concrete anti-seepage wall and construction method - Google Patents
Anti-seepage joint structure of geomembrane anti-seepage panel and concrete anti-seepage wall and construction method Download PDFInfo
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- CN112195862A CN112195862A CN202010938965.0A CN202010938965A CN112195862A CN 112195862 A CN112195862 A CN 112195862A CN 202010938965 A CN202010938965 A CN 202010938965A CN 112195862 A CN112195862 A CN 112195862A
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- seepage
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
Abstract
The invention discloses an impervious joint structure of a geomembrane impervious panel and a concrete impervious wall and a construction method, wherein the impervious joint structure comprises the concrete impervious wall, a formwork-enlarging area and a cushion layer with certain inclination angles are sequentially arranged on one side of the concrete impervious wall, which is close to a warehouse slope, a supporting layer which is bent upwards and extends is arranged above the formwork-enlarging area and the cushion layer, and one end of the supporting layer, which is close to the concrete impervious wall, is sunken downwards to form a groove; a geomembrane anti-seepage panel is laid on the surface of the supporting layer, and the bottom end of the geomembrane anti-seepage panel is fixedly connected with the concrete anti-seepage wall; and the upper part of the geomembrane anti-seepage panel is densely filled with the fine powder filler in the area corresponding to the groove, and the surface of the fine powder filler is covered with the reinforced geomembrane. The invention provides a geomembrane and foundation concrete impervious wall connecting joint structure which is convenient and fast to construct, safe and reliable, ensures that the seepage of a reservoir (dam) is prevented to form a closed whole, and reduces the leakage loss.
Description
Technical Field
The invention relates to the field of reservoir and dam seepage-proofing engineering, in particular to a seepage-proofing joint structure of a geomembrane seepage-proofing panel and a concrete seepage-proofing wall and a construction method.
Background
In recent years, geomembrane seepage prevention technology is widely applied to seepage prevention design of reservoirs and dams. In general, the anchoring of the geomembrane to the peripheral structure is an important part of the geomembrane anti-seepage structure and is also a key technical problem for the research of the anti-seepage structure. Different anchoring types are adopted according to different conditions of surrounding buildings and foundations, so that the safety and reliability of the connecting structure are guaranteed. For the engineering of seepage control by adopting a geomembrane on a dam or a bank, when the engineering is connected with a foundation concrete seepage control wall, water leakage of a reservoir is often caused by unreasonable connection structure, and the engineering safety is influenced in serious cases. How to ensure the quality of the seepage-proofing structure of the geomembrane panel and the foundation concrete seepage-proofing wall through certain measures, prolong the service life of the seepage-proofing structure and reduce the seepage loss of a reservoir is an important technology in the design and operation of hydropower engineering.
Based on the situation, the invention provides an anti-seepage joint structure of a geomembrane anti-seepage panel and a concrete anti-seepage wall and a construction method, which can effectively solve the problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-seepage joint structure of a geomembrane anti-seepage panel and a concrete anti-seepage wall and a construction method. The invention provides a geomembrane and foundation concrete impervious wall connecting joint structure which is convenient and fast to construct, safe and reliable, ensures that the seepage of a reservoir (dam) is prevented to form a closed whole, and reduces the leakage loss.
In order to solve the technical problems, the invention is realized by the following technical scheme:
on one hand, the invention provides an impervious joint structure of a geomembrane impervious panel and a concrete impervious wall, which comprises the concrete impervious wall, wherein a mold increasing area and a cushion layer with certain inclination angles are sequentially arranged on one side of the concrete impervious wall, which is close to a warehouse slope, a supporting layer which is bent upwards and extends is arranged above the mold increasing area and the cushion layer, and one end of the supporting layer, which is close to the concrete impervious wall, is sunken downwards to form a groove;
a geomembrane anti-seepage panel is laid on the surface of the supporting layer, and the bottom end of the geomembrane anti-seepage panel is fixedly connected with the concrete anti-seepage wall; the upper part of the geomembrane anti-seepage panel is densely filled with fine powder filler in the area corresponding to the groove, and the surface of the fine powder filler is covered with a reinforced geomembrane; the fine filler powder can permeate into the geomembrane seepage-proofing panel or the gap of the reinforced geomembrane under the action of gravity and water power, so that the self-healing effect of the seepage-proofing structure is realized.
As a preferred technical scheme of the invention, the bottom end of the geomembrane impervious panel is bent upwards along the wall body of the concrete impervious wall and is fixedly connected with the concrete impervious wall through an anchoring piece to form a closed impervious system.
As a preferred technical scheme of the invention, one end of the reinforced geomembrane is hermetically connected with the geomembrane anti-seepage panel, and the other end of the reinforced geomembrane is fixedly connected with the concrete anti-seepage wall through an anchoring piece.
As a preferable technical scheme of the invention, the fine filler is fine sand or fine sandy soil.
On the other hand, the invention also provides a construction method of the anti-seepage joint structure of the geomembrane anti-seepage panel and the concrete anti-seepage wall, which comprises the following steps:
a. filling a dam or a reservoir bank cushion layer in a layered mode, and pouring a concrete impervious wall on the water facing side of the cushion layer;
b. excavating a bedding material in the range of the mold increasing area, and filling the mold increasing area in the range in a layered mode;
c. after the construction of the cushion layer and the mold increasing area is finished, filling a support layer, performing fillet repairing treatment on the base surface of the support layer, removing oversize particles on the surface, and synchronously paving a geomembrane anti-seepage panel;
d. locally roughening the concrete impervious wall, and anchoring the geomembrane impervious panel and the concrete impervious wall by adopting an anchoring part;
e. filling fine powder filler layer by layer;
f. and paving a reinforced geomembrane to protect the fine filler.
In the step b, a gravel cushion material is adopted in the mold expansion area, and the porosity of the gravel cushion material is higher than that of the cushion layer and is generally less than 16%.
As a preferred technical solution of the present invention, in the step c, the geomembrane impermeable panels in the range of the formwork-adding area are spread and maintained with a certain looseness, and the length direction of each geomembrane is parallel to the axis of the impermeable wall, so as to reduce the seams.
In the step f, one end of the reinforced geomembrane is anchored on the foundation concrete seepage-proofing wall through an anchoring part, the middle part of the reinforced geomembrane is pre-arched, the other end of the reinforced geomembrane is firmly adhered to the geomembrane seepage-proofing panel through an adhesive, and the adhesion length is 20-30 cm.
As a preferred embodiment of the present invention, the anchoring process step includes: chiseling the anchoring part of the concrete impervious wall, leveling by adopting an SR leveling layer, laying an SR impervious adhesive tape layer, covering a geomembrane impervious panel or a reinforced geomembrane, covering an SR impervious protective cover sheet, fixing by adopting a stainless steel plate, and anchoring by adopting a stainless steel expansion bolt.
As a preferred technical scheme, the geomembrane anti-seepage panel is of a two-cloth one-film structure, the specifications of the upper and lower layers of geotextile are 10-20 kN/m, and the thickness is 1-2 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. when the geomembrane anti-seepage panel has holes and tension cracks in the operation period, the powder fine filler fills cracks or defect parts in time under the action of the self weight and the hydraulic action, so that the ideal effect of self-healing of the structure is achieved, and the leakage amount and the defect development speed can be controlled even if the defects are serious; in addition, the reinforced geomembrane has a downward acting force on the fine powder filler after being subjected to the pressure of a water head, so that the self-healing effect of the fine powder filler on the geomembrane anti-seepage panel is further enhanced; meanwhile, the reinforced geomembrane can also receive the counterforce from the fine powder filler, and a counterfort effect (self-healing) is generated on the reinforced geomembrane.
2. Bed course, increase mould district and support layer all arrange to storehouse slope outside direction slope, and its advantage lies in: a groove is conveniently formed between the concrete impervious wall and the groove, and a foundation space is provided for filling the fine powder filler; and the extension direction of the anti-seepage joint is the same as the extension direction of the reservoir slope, so that the anti-seepage joint can better bear the pressure from a water head, and the stability of the anti-seepage joint structure of the geomembrane anti-seepage panel and the concrete anti-seepage wall is ensured.
3. The reinforced geomembrane is adopted to carry out secondary sealing on the geomembrane anti-seepage panel and the concrete anti-seepage wall, so that the auxiliary anti-seepage effect is achieved, the reliability of the anti-seepage structure is improved, and the fine powder filler on the upper part of the geomembrane anti-seepage panel is protected from loss.
4. The geomembrane seepage-proofing panel adopts a reverse slope-folding design at the bottom end, and is anchored on the vertical wall of the concrete seepage-proofing wall by using an anchoring part, the bottom end of the geomembrane is made into a broken line type, the length of the geomembrane is greater than that of the straight line type so as to adapt to the requirement of structural settlement deformation, and the geomembrane can bear certain foundation deformation after water storage of a reservoir and is not easy to be pulled and cracked.
5. The lower part of the geomembrane is provided with a mold increasing area, the porosity required during filling and rolling is less than 16 percent, the rolling requirement of the bedding material is higher, and the deformation of the geomembrane foundation can be controlled after the reservoir stores water.
6. The anti-seepage structure has the characteristics of reliable structure and convenience in construction.
Drawings
FIG. 1 is a typical cross-sectional view of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
As shown in fig. 1 to 2, the embodiment is suitable for the hydropower and water conservancy project in which the dam or the bank adopts the geomembrane and the joint exists between the geomembrane and the foundation concrete impervious wall, and the seepage-proofing effect of the reservoir is ensured and the seepage loss of the reservoir is reduced by arranging the reasonable seepage-proofing structure. The present embodiment mainly comprises a geomembrane seepage-proofing panel 1, a reinforced geomembrane 2, a concrete seepage-proofing wall 3, an anchoring piece 4, a fine filler 5 (fine material or fine sand soil), a cushion layer 6, a formwork-increasing area 7, a supporting layer 8 and other stones or foundations 9.
The invention provides a seepage-proofing joint structure of a geomembrane seepage-proofing panel and a concrete seepage-proofing wall, which comprises the concrete seepage-proofing wall 3, wherein a mold increasing area 7 and a cushion layer 6 with certain inclination angles are sequentially arranged on one side of the concrete seepage-proofing wall 3 close to a warehouse slope, a supporting layer 8 which is bent upwards and extends is arranged above the mold increasing area 7 and the cushion layer 6, and one end of the supporting layer 8, close to the concrete seepage-proofing wall 3, is downwards sunken to form a groove; the geomembrane anti-seepage panel 1 is laid on the surface of the support layer 8, and the bottom end of the geomembrane anti-seepage panel 1 is fixedly connected with the concrete anti-seepage wall 3; the upper part of the geomembrane anti-seepage panel 1 is densely filled with fine powder fillers 5 in the area corresponding to the groove, and the surface of the fine powder fillers 5 is covered with a reinforced geomembrane 2; the powder fine filler 5 can permeate into the gaps of the geomembrane seepage-proofing panel 1 or the reinforced geomembrane 2 under the action of gravity and water power, so that the self-healing effect of the seepage-proofing structure is realized.
The geomembrane anti-seepage panel 1 is generally designed by adopting two cloth layers and one film layer, a composite geomembrane or a geomembrane with separated film cloth can be adopted, and the specification of the upper and lower layers of geomembranes is 10-20 kN/m; the thickness of the geomembrane anti-seepage panel 1 is determined by calculation according to the characteristics of an acting water head, a supporting layer 8 and the like, and is generally 1-2 mm. The geomembrane impervious panel 1 is anchored on the vertical wall of the foundation concrete impervious wall 3 through an anchoring part 4. The geomembrane anti-seepage panel 1 adopts a deformation amount generated by the action of water pressure of a fold line type reserved structure at the joint part, and adopts fine powder filler 5 for anti-seepage protection.
The upper parts of the geomembrane seepage-proofing panel 1 and the foundation concrete seepage-proofing wall 3 are additionally provided with a reinforced geomembrane 2 for reinforcing the seepage-proofing structure at the position and playing a role of a first defense line for preventing local seepage of the reservoir.
The concrete impervious wall 3 is a dam foundation or a vertical impervious structure at the bottom of a reservoir, adopts a reinforced concrete structure, and is fixed with the geomembrane impervious panel 1 and the reinforced geomembrane 2 by the anchoring parts 4. The grade of the concrete impervious wall 3 is not lower than C25; the thickness of the wall body is determined according to the calculation of the allowable hydraulic gradient, and is generally 0.6-1.2 m.
The cushion material of the cushion layer 6 has good gradation, stable internal structure or stable self-reverse filtration, the maximum grain diameter is 80-100 mm, the content of particles smaller than 5mm is preferably 35-55%, and the content of particles smaller than 0.075mm is preferably 4-8%; has low compressibility and high shear strength after compaction, and the permeability coefficient is preferably i multiplied by 10-4～10-3cm/s; the construction method has good construction characteristics, and the thickness of the cushion material is 40 cm.
The supporting layer is a supporting structure of the geomembrane and is formed by mixing broken stones and fine sand, the maximum particle size is 20mm, and the thickness of the supporting layer is 20 cm.
The embodiment provides a construction method of an anti-seepage joint structure of a working membrane anti-seepage panel and a concrete anti-seepage wall, which comprises the following steps:
a. filling a dam or a reservoir bed course 6 in layers, and pouring a concrete impervious wall 3 on the water facing side of the bed course 6;
b. excavating bedding materials in the range of the mold increasing area 7, and filling the mold increasing area 7 in the range in a layered mode;
the mould-increasing area 7 is filled with a gravel cushion material, and the porosity of the gravel cushion material is lower than that of the cushion layer 6 and is generally less than 16%.
c. After the construction of the cushion layer 6 and the mold adding area 7 is finished, filling the support layer 8, performing fillet trimming treatment on the base surface of the support layer 8, removing the oversize particles on the surface, and synchronously paving the geomembrane anti-seepage panel 1;
paving the geomembrane impervious panel 1 within the range of the formwork augmentation area 7, keeping a certain looseness, and enabling the length direction of each geomembrane to be parallel to the axis of the concrete impervious wall so as to reduce seams. The bottom end of the geomembrane impervious panel 1 is bent upwards along the wall body of the concrete impervious wall 3 and is fixedly connected with the concrete impervious wall 3 through an anchoring piece 4 to form a closed impervious system.
d. Locally roughening the concrete impervious wall 3, and anchoring the geomembrane impervious panel 1 and the concrete impervious wall 3 by using an anchoring part 4;
the anchoring part 4 comprises an SR leveling layer, an SR anti-seepage rubber strip, an SR anti-seepage protection cover plate, a stainless steel plate and a stainless steel expansion bolt. Roughening the anchoring part of the concrete impervious wall 3, leveling by adopting an SR leveling layer, laying an SR seepage-proofing adhesive tape, covering the geomembrane seepage-proofing panel 1 or the reinforced geomembrane 2, covering the SR seepage-proofing protective cover sheet, fixing by adopting a stainless steel plate, and anchoring by adopting a stainless steel expansion bolt. SR base glue is smeared among the SR leveling layer, the seepage-proofing adhesive tape, the geomembrane seepage-proofing panel 1 or the reinforced geomembrane 2, and an edge sealing agent is smeared on the edge of the SR seepage-proofing protective cover sheet. For northern cold regions, countersunk bolts can also be used to replace stainless steel nuts.
e. Filling fine powder filler 5 in layers;
the fine filler 5 is fine material or fine sand, when the geomembrane anti-seepage panel has local holes and defects, the fine filler 5 can perform silting anti-seepage on damaged parts under the action of self weight and water pressure, and the ideal effect of self-healing is achieved.
f. And paving the reinforced geomembrane 2 to protect the fine powder filler 5.
One end of the reinforced geomembrane 2 is anchored on the foundation concrete impervious wall 3 through an anchoring part 4, the middle part is pre-arched, the other end of the reinforced geomembrane is firmly adhered with the geomembrane impervious panel 1 through an adhesive, and the adhesion length is 20-30 cm.
According to the description and the drawings of the invention, the person skilled in the art can easily manufacture or use the geomembrane anti-seepage panel and concrete anti-seepage joint structure of the invention and can produce the positive effects recorded in the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a geomembrane impervious face plate and concrete impervious wall's anti-seepage joint structure which characterized in that: the concrete impervious wall comprises a concrete impervious wall (3), wherein a formwork increasing area (7) and a cushion layer (6) with a certain inclination angle are sequentially arranged on one side of the concrete impervious wall (3) close to a warehouse slope, a supporting layer (8) which is bent upwards and extends is arranged above the formwork increasing area (7) and the cushion layer (6), and one end, close to the concrete impervious wall (3), of the supporting layer (8) is downwards sunken to form a groove;
the geomembrane anti-seepage panel (1) is laid on the surface of the support layer (8), and the bottom end of the geomembrane anti-seepage panel (1) is fixedly connected with the concrete anti-seepage wall (3); a fine powder filler (5) is densely filled in a region above the geomembrane anti-seepage panel (1) and corresponding to the groove, and a reinforced geomembrane (2) covers the surface of the fine powder filler (5); the powder fine filler (5) can permeate into the gaps of the geomembrane seepage-proofing panel (1) or the reinforced geomembrane (2) under the action of gravity and water power, and the self-healing effect of the seepage-proofing structure is realized.
2. The anti-seepage joint structure of geomembrane anti-seepage panel and concrete anti-seepage wall according to claim 1, characterized in that: the bottom end of the geomembrane impervious panel (1) is bent upwards along the wall body of the concrete impervious wall (3) and is fixedly connected with the concrete impervious wall (3) through the anchoring piece (4) to form a closed impervious system.
3. The anti-seepage joint structure of geomembrane anti-seepage panel and concrete anti-seepage wall according to claim 1, characterized in that: one end of the reinforced geomembrane (2) is hermetically connected with the geomembrane anti-seepage panel (1), and the other end of the reinforced geomembrane is fixedly connected with the concrete anti-seepage wall (3) through an anchoring piece (4).
4. The anti-seepage joint structure of geomembrane anti-seepage panel and concrete anti-seepage wall according to claim 1, characterized in that: the fine filler (5) is fine sand or fine sand soil.
5. A method for constructing an impervious joint structure of a geomembrane impervious panel and a concrete impervious wall according to claim 1, which comprises the following steps:
a. filling a dam or a reservoir bank cushion layer (6) in a layered mode, and pouring a concrete impervious wall (3) on the water facing side of the cushion layer (6);
b. excavating bedding materials in the range of the mold increasing area (7), and filling the mold increasing area (7) in the range in a layered mode;
c. after the construction of the cushion layer (6) and the mold increasing area (7) is finished, filling the supporting layer (8), carrying out fillet trimming treatment on the basic surface of the supporting layer (8), removing oversize particles on the surface, and synchronously paving the geomembrane anti-seepage panel (1);
d. locally roughening the concrete impervious wall (3), and anchoring the geomembrane impervious panel (1) and the concrete impervious wall (3) by using an anchoring piece (4);
e. fine filler (5) of powder is filled in layers;
f. paving the reinforced geomembrane (2) to protect the fine powder filler (5).
6. The construction method of the anti-seepage joint structure of the geomembrane anti-seepage panel and the concrete anti-seepage wall according to claim 5, wherein the construction method comprises the following steps: in the step b, a broken stone bedding material is adopted in the mold expansion area (7), and the porosity of the broken stone bedding material is lower than that of the bedding layer (6), and is generally less than 16%.
7. The construction method of the anti-seepage joint structure of the geomembrane anti-seepage panel and the concrete anti-seepage wall according to claim 5, wherein the construction method comprises the following steps: in the step c, the geomembrane anti-seepage panel (1) in the range of the formwork increasing area (7) is paved, certain looseness is kept, and the length direction of each geomembrane is parallel to the axis of the concrete anti-seepage wall so as to reduce seams.
8. The construction method of the anti-seepage joint structure of the geomembrane anti-seepage panel and the concrete anti-seepage wall according to claim 5, wherein the construction method comprises the following steps: in the step f, one end of the reinforced geomembrane (2) is anchored on the foundation concrete impervious wall (3) through an anchoring part (4), the middle part is pre-arched, the other end of the reinforced geomembrane is firmly adhered with the geomembrane impervious panel (1) through an adhesive, and the adhesion length is 20-30 cm.
9. The construction method of the geomembrane impervious panel and concrete impervious wall barrier joint structure according to claim 5, wherein said anchoring treatment step comprises: roughening the anchoring part of the concrete impervious wall (3), leveling by adopting an SR leveling layer, laying an SR impervious adhesive tape, covering a geomembrane impervious panel (1) or a reinforced geomembrane (2) above the SR impervious adhesive tape, covering an SR impervious protective cover sheet, fixing by adopting a stainless steel plate, and anchoring by adopting a stainless steel expansion bolt.
10. The construction method of the anti-seepage joint structure of the geomembrane anti-seepage panel and the concrete anti-seepage wall according to claim 5, wherein the construction method comprises the following steps: the geomembrane anti-seepage panel (1) is of a two-cloth one-film structure, the specifications of the upper and lower layers of geotextile are 10-20 kN/m, and the thickness is 1-2 mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103243681A (en) * | 2013-05-16 | 2013-08-14 | 黄河勘测规划设计有限公司 | Flexible connection method for geomembrane for earth and rockfill dam seepage proofing and concrete building |
| CN103526724A (en) * | 2013-10-25 | 2014-01-22 | 中国水电顾问集团中南勘测设计研究院有限公司 | Anchoring impervious structure in which reservoir bottom geomembrane is connected with reservoir periphery drainage gallery peripheral joints |
| US20170198451A1 (en) * | 2016-01-08 | 2017-07-13 | Powerchina Huadong Engineering Corporation Limited | Cofferdam deformation-adaptive impervious structure and construction method of composite geomembrane |
| CN109338998A (en) * | 2018-10-12 | 2019-02-15 | 中水电第十工程局（郑州）有限公司 | A kind of stainless steel faceplate rock-fill dams |
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2020
- 2020-09-09 CN CN202010938965.0A patent/CN112195862A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103243681A (en) * | 2013-05-16 | 2013-08-14 | 黄河勘测规划设计有限公司 | Flexible connection method for geomembrane for earth and rockfill dam seepage proofing and concrete building |
| CN103526724A (en) * | 2013-10-25 | 2014-01-22 | 中国水电顾问集团中南勘测设计研究院有限公司 | Anchoring impervious structure in which reservoir bottom geomembrane is connected with reservoir periphery drainage gallery peripheral joints |
| US20170198451A1 (en) * | 2016-01-08 | 2017-07-13 | Powerchina Huadong Engineering Corporation Limited | Cofferdam deformation-adaptive impervious structure and construction method of composite geomembrane |
| CN109338998A (en) * | 2018-10-12 | 2019-02-15 | 中水电第十工程局（郑州）有限公司 | A kind of stainless steel faceplate rock-fill dams |
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Application publication date: 20210108 |
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