CN113089584A - Construction method of soil dam heightening anti-seepage PVC geomembrane - Google Patents
Construction method of soil dam heightening anti-seepage PVC geomembrane Download PDFInfo
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- CN113089584A CN113089584A CN202110290983.7A CN202110290983A CN113089584A CN 113089584 A CN113089584 A CN 113089584A CN 202110290983 A CN202110290983 A CN 202110290983A CN 113089584 A CN113089584 A CN 113089584A
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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
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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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
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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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/126—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of bituminous material or synthetic resins
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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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/127—Flexible prefabricated covering elements, e.g. mats, strips bags filled at the side
-
- 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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/128—Coherent linings made on the spot, e.g. cast in situ, extruded on the spot
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Revetment (AREA)
Abstract
The invention provides a construction method of an earth dam heightening impermeable geomembrane, which comprises the following steps: digging a groove at the dam crest of the original earth dam; providing a plurality of rolls of geotextile and conveying the geotextile to the top of the original earth dam, firstly spreading one side of the geotextile on the slope of the original earth dam, and then spreading the other side of the geotextile into the groove; and filling concrete to the top and the groove of the original earth dam to increase the height of the original earth dam to form a new earth dam. By adopting the technical scheme of the invention, the original dam heightening project is realized by adopting simple raw materials, the materials such as the geotextile and the geomembrane are light in weight, convenient to transport, short in purchasing period and low in purchasing cost, and are beneficial to improving the construction efficiency, the new concrete and the old concrete are tightly occluded with each other by arranging the groove structure, and the geotextile and the geomembrane are anchored by using the screw rod, so that the geotextile and the geomembrane are firmly anchored, the new concrete and the old concrete are stably occluded, the anti-seepage effect is improved, and interlayer slippage is prevented.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to a construction method of an earth dam heightening anti-seepage PVC geomembrane.
Background
A water retaining dam is a water retaining structure which intercepts water flow of river channels to raise the water level or adjust the flow. Can form a reservoir, raise the water level, regulate runoff and concentrate water head, and is used for flood control, water supply, irrigation, hydroelectric power generation, shipping improvement and the like. And can also adjust the river situation and protect river channels of the bank bed. The height of the existing retaining dam is fixed after the construction is finished, when the water level is sharply increased in an emergency environment event of a basin, water flow easily flows over the retaining dam, flood is leaked out, and unnecessary loss is caused, so that the original earth dam is heightened to deal with the emergency event,
in recent years, dam body heightening is specifically proposed for a batch of danger-eliminating reinforcement projects in some concrete dams. A large number of simulation calculation and field test results show that the combination problem of new and old concrete layers needs to be solved firstly in the concrete dam heightening project, the joint stress of the new and old concrete is ensured, the stress and deformation of the heightened dam body meet the standard requirements, and cracks, particularly harmful cracks, generated between newly-poured concrete and old concrete due to temperature shrinkage are reduced as far as possible. In addition, the deformation modulus of the newly poured concrete and the like should be consistent with those of the old concrete as much as possible, so that deformation is coordinated, and adverse effects on a dam body are avoided.
At present concrete layer face combines generally to be accomplished through methods such as chisel hair, dowel or laying keyway, and the keyway is arranged and is the banding and distributes along rivers or perpendicular rivers direction usually, and is discontinuous, has hidden danger such as new and old concrete aspect combination unstability, seepage, in case the seepage problem appears between the layer, and engineering measures such as chemical grout are handled through to the later stage, and work load is big, the expense is high, and along with the time extension, probably locate repeatedly the seepage. For example, in the prior art, publication numbers are: the patent document "CN 206941513U" discloses a structure for combining new and old concrete layers, which includes a first copper water stop and a second copper water stop located between an upstream dam facing and a downstream dam facing and respectively arranged along the upstream dam facing and the downstream dam facing; two pairwise connected rectangular frustum-shaped key groove (4) arrays are arranged in a dam surface area between the first copper water stop and the second copper water stop, the concave-convex directions of the adjacent rectangular frustum-shaped key grooves are opposite, and the top surfaces of the rectangular frustum-shaped key grooves are provided with dowel bars. By adopting the technical scheme described in the patent document, the problems that after the concrete dam is heightened, the new and old concrete layers are tightly and completely combined, slippage, leakage and the like between the layers are avoided, and the technical scheme described in the patent document is complex in structure, more and expensive in used raw materials, high in construction cost, long in raw material purchasing period and not beneficial to rapid construction.
Disclosure of Invention
In order to solve the technical problems, the invention provides a construction method of an earth dam heightening anti-seepage PVC geomembrane.
The invention is realized by the following technical scheme.
The invention provides a construction method of an earth dam heightening anti-seepage PVC geomembrane, which comprises the following steps:
the method comprises the following steps: digging a groove at the dam crest of the original earth dam;
step two: providing a plurality of rolls of geotextile and conveying the geotextile to the dam crest of the original earth dam in the step one, firstly spreading one side of the geotextile on the slope surface of the original earth dam, and then spreading the other side of the geotextile into the groove in the step one;
step three: and filling concrete on the dam top and the groove of the original earth dam in the step two, so that the original earth dam is heightened to form a new earth dam.
And in the first step, the grooves are dug and arranged on the split axis of the slopes on the two sides of the original dam.
In the first step, the depth of the groove is not less than 2m relative to the depth of the dam crest of the original dam.
And in the second step, at least two layers of geotextiles are spread along the slopes on the two sides of the original dam, and a PVC geomembrane is further spread between every two adjacent layers of geotextiles.
And step two, the geotextile is in multiple rolls, the multiple rolls of geotextile are gradually rolled and progressively spread along the slope surfaces at two sides of the original dam, and the lap joint width of two adjacent rolls of geotextile is not less than 8 cm.
The concrete performance in the third step meets the following technical conditions: strength of 1.5 to 4MPa, and elastic modulus of 500 to 1000 MPa.
The construction method of the soil dam heightened anti-seepage PVC geomembrane further comprises the following steps: and after the second step is finished, supporting the geotextile on the inner walls of the left side and the right side of the groove by using reinforcing steel bars.
The construction method of the soil dam heightened anti-seepage PVC geomembrane further comprises the following steps: and providing a screw rod and a nut, drilling a rib planting hole at the boundary edge of the dam crest and the slope surface of the original dam after the step two is completed, firstly, penetrating one end of the screw rod through the geotextile, then inserting the geotextile into the rib planting hole, and then screwing the nut at the other end of the screw rod to clamp the geotextile between the dam crest and the nut of the original dam.
The construction method of the soil dam heightened anti-seepage PVC geomembrane further comprises the following steps: and after the step two is finished, placing bagged sand at the edge of the junction of the top of the original dam and the slope surface of the original dam to prevent the geotextile from sliding off, and removing all the bagged sand before the step three is carried out.
And in the third step, the concrete mixing raw materials comprise water, cement, bentonite, sand and macadam, and the water cement ratio of the concrete is 1.95.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the old concrete of the original earth dam is covered by the geotextile and the PVC geomembrane, and then the new concrete is poured, the original earth dam heightening project is realized by adopting simple raw materials, the geotextile, the PVC geomembrane and other materials have light weight, are convenient to transport, have short purchase period and are beneficial to improving the construction efficiency, the newly poured concrete and the old concrete can be tightly occluded by arranging the mutually occluded groove structures between the new concrete and the old concrete, so that the slippage between layers caused by uneven stress of the new concrete and the old concrete is avoided, the geotextile and the PVC geomembrane are stably clamped, the interlayer leakage is avoided, the geotextile and the PVC geomembrane are also placed and arranged to slide, in addition, the geotextile and the PVC geomembrane are anchored by using the screw, the anti-seepage effect is further improved, and the new concrete and the old concrete are more tightly connected by the screw.
Drawings
Fig. 1 is a schematic structural view of the raised earth dam of the present invention.
In the figure: 1-original earth dam, 2-groove, 3-geotextile, 4-concrete, 5-PVC geomembrane, 6-steel bar, 7-screw, 8-nut and 9-bar planting glue.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, the invention provides a construction method of an earth dam with a high impervious PVC geomembrane, which comprises the following steps:
the method comprises the following steps: digging a trench 2 at the top of the original earth dam 1; furthermore, in the first step, the trench 2 is dug and arranged on the medial axis of the slope surfaces on the two sides of the original earth dam 1. In the first step, the depth of the groove 2 is not less than 2m relative to the depth of the dam top of the original earth dam 1.
Step two: providing a plurality of rolls of geotextile 3 and conveying the geotextile to the dam crest of the original earth dam 1 in the step one, firstly spreading one side of the geotextile 3 on the slope surface of the original earth dam 1, and then spreading the other side of the geotextile 3 into the groove 2 in the step one; in addition, in the second step, at least two layers of geotextile 3 are spread along the slope surfaces on the two sides of the original earth dam 1, and a PVC geomembrane 5 is further paved between the two adjacent layers of geotextile 3. And the PVC geomembrane 5 enables the adjacent two layers of geotextile 3 to be more tightly attached together, so that the anti-seepage effect is improved, the geotextile 3 in the step two is in a plurality of rolls, the plurality of rolls of geotextile 3 are gradually rolled and progressively spread along the slope surfaces on the two sides of the original earth dam 1, and the lap joint width of the adjacent two rolls of geotextile 3 is not less than 8 cm. The construction method of the heightened impervious PVC geomembrane for the earth dam further comprises the following steps: after the second step is completed, the geotextile 3 is supported on the inner walls of the left and right sides of the trench 2 by using the reinforcing steel bars 6. The nominal diameter of the steel bar 6 is not less than 20 mm.
Step three: and filling concrete 4 on the top of the original earth dam 1 and the groove 2 in the step two, so that the original earth dam 1 is heightened to form a new earth dam.
In addition, the performance of the concrete 4 in the third step meets the following technical conditions: strength of 1.5 to 4MPa, and elastic modulus of 500 to 1000 MPa. The construction method of the heightened impervious PVC geomembrane for the earth dam further comprises the following steps: and providing a screw rod 7 and a nut 8, drilling a rib planting hole at the boundary edge of the dam crest and the slope surface of the original dam 1 after the step two is completed, inserting one end of the screw rod 7 into the rib planting hole after the geotextile 3 penetrates through the screw rod 7, screwing the nut 8 at the other end of the screw rod 7, and clamping the geotextile 3 between the dam crest of the original dam 1 and the nut 8. The number of the screw rods 7 and the number of the nuts 8 are multiple pairs, and the distance between every two adjacent screw rods 7 is not more than 25 cm. The nominal diameter of the screw 7 is not less than 12mm, the length is not less than 250mm, and the depth of the planting hole relative to the dam crest of the original earth dam 1 is not less than 200 mm. On the one hand, screw rod 7 and nut 8 play the effect of anchor geotechnological cloth, PVC geomembrane, and on the other hand, screw rod 7 also makes the firm interlock of new and old concrete be in the same place with nut 8 to prevent to take place the interlayer and slide.
In addition, the construction method of the heightened impervious PVC geomembrane for the earth dam further comprises the following steps: after drilling the bar planting hole, removing all impurities in the bar planting hole, injecting bar planting glue 9 into the bar planting hole, after inserting one end of the screw 7 into the bar planting hole, standing for 24 hours until the bar planting glue 9 is completely condensed, and screwing the nut 8 at the other end of the screw 7. The construction method of the heightened impervious PVC geomembrane for the earth dam further comprises the following steps: and after the step two is finished, the bagged sand is placed at the edge of the junction of the top of the original dam 1 and the slope surface of the original dam to prevent the geotextile 3 from sliding off, and all the bagged sand is removed before the step three is carried out.
In addition, in the third step, the raw materials mixed with the concrete 4 comprise water, cement, bentonite, sand and macadam, and the water cement ratio of the concrete 4 is 1.95. Preferably the sand has a particle size of no more than 5 mm. The particle size of the crushed stone is 5mm to 10 mm. The density of the bentonite is 30kg/m 3.
By adopting the technical scheme of the invention, the old concrete of the original earth dam is covered by the geotextile and the PVC geomembrane, and then the new concrete is poured, the original earth dam heightening project is realized by adopting simple raw materials, the geotextile, the PVC geomembrane and other materials have light weight, are convenient to transport, have short purchase period and are beneficial to improving the construction efficiency, the newly poured concrete and the old concrete can be tightly occluded by arranging the mutually occluded groove structures between the new concrete and the old concrete, so that the slippage between layers caused by uneven stress of the new concrete and the old concrete is avoided, the geotextile and the PVC geomembrane are stably clamped, the interlayer leakage is avoided, the geotextile and the PVC geomembrane are also placed and arranged to slide, in addition, the geotextile and the PVC geomembrane are anchored by using the screw, the anti-seepage effect is further improved, and the new concrete and the old concrete are more tightly connected by the screw.
Claims (10)
1. A construction method of an earth dam heightening anti-seepage PVC geomembrane is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: digging a groove (2) on the top of the original earth dam (1);
step two: providing a plurality of rolls of geotextile (3) and conveying the geotextile to the dam crest of the original earth dam (1) in the step one, firstly spreading one side of the geotextile (3) on the slope surface of the original earth dam (1), and then spreading the other side of the geotextile (3) into the groove (2) in the step one;
step three: and filling concrete (4) on the dam crest and the groove (2) of the original earth dam (1) in the step two, so that the original earth dam (1) is heightened to form a new earth dam.
2. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: in the first step, the grooves (2) are dug and arranged on the medial axis of the slopes on the two sides of the original earth dam (1).
3. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: in the first step, the depth of the groove (2) is not less than 2m relative to the depth of the top of the original earth dam (1).
4. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: and in the second step, at least two layers of geotextiles (3) are spread along the slopes on the two sides of the original earth dam (1), and a PVC geomembrane (5) is further laid between every two adjacent layers of geotextiles (3).
5. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: and in the second step, the geotextile (3) is in multiple rolls, the multiple rolls of geotextile (3) are gradually rolled and progressively spread along the slope surfaces at two sides of the original earth dam (1), and the lap joint width of two adjacent rolls of geotextile (3) is not less than 8 cm.
6. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: in the third step, the performance of the concrete (4) meets the following technical conditions: strength of 1.5 to 4MPa, and elastic modulus of 500 to 1000 MPa.
7. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: the construction method of the soil dam heightened anti-seepage PVC geomembrane further comprises the following steps: and after the second step is finished, supporting the geotextile (3) on the inner walls of the left side and the right side of the groove (2) by using reinforcing steel bars (6).
8. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: the construction method of the soil dam heightened anti-seepage PVC geomembrane further comprises the following steps: and (2) providing a screw rod (7) and a nut (8), drilling a rib planting hole at the boundary edge of the dam top and the slope surface of the original earth dam (1) after the step two is completed, firstly, penetrating one end of the screw rod (7) through the geotextile (3) and then inserting the geotextile (3) into the rib planting hole, and then, screwing the nut (8) at the other end of the screw rod (7) to clamp the geotextile (3) between the dam top of the original earth dam (1) and the nut (8).
9. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: the construction method of the soil dam heightened anti-seepage PVC geomembrane further comprises the following steps: and after the step two is finished, the bagged sand is placed at the edge of the boundary between the top of the original earth dam (1) and the slope surface of the original earth dam to prevent the geotextile (3) from sliding off, and all the bagged sand is removed before the step three is carried out.
10. The construction method of the high-seepage-proofing PVC geomembrane for the earth dam as claimed in claim 1, wherein: and in the third step, the concrete (4) is mixed with raw materials comprising water, cement, bentonite, sand and broken stones, and the water cement ratio of the concrete (4) is 1.95.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110290983.7A CN113089584A (en) | 2021-03-18 | 2021-03-18 | Construction method of soil dam heightening anti-seepage PVC geomembrane |
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| CN202110290983.7A CN113089584A (en) | 2021-03-18 | 2021-03-18 | Construction method of soil dam heightening anti-seepage PVC geomembrane |
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2021
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