CN104652371A - Overflow cemented rock-fill dam established based on old dam and construction method thereof - Google Patents
Overflow cemented rock-fill dam established based on old dam and construction method thereof Download PDFInfo
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- CN104652371A CN104652371A CN201510045483.1A CN201510045483A CN104652371A CN 104652371 A CN104652371 A CN 104652371A CN 201510045483 A CN201510045483 A CN 201510045483A CN 104652371 A CN104652371 A CN 104652371A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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Abstract
The invention relates to an overflow cemented rock-fill dam established based on an old dam and a construction method thereof. The overflow cemented rock-fill dam is established through sequentially laying a cemented sand and gravel dam layer and a rock-fill concrete coating layer on the surface of the old dam from inside to outside. The construction method comprises an old dam upstream and downstream surface construction method and an old dam top construction method. The old dam upstream and downstream surface construction method comprises the steps: cleaning a storehouse surface; setting up an upstream formwork and a downstream formwork; filling rocks; filling cemented sand and gravel materials; pouring self-sealing concrete. The old dam top construction method comprises the steps: heightening the dam top of the old dam; filling rocks to the dam top; pouring dam top self-sealing concrete; removing the upstream formwork and the downstream formwork. According to the overflow cemented rock-fill dam established based on the old dam and the construction method thereof, the rapid construction of rock-fill concrete and the cemented sand and gravel materials based on the old dam is realized, the procedure of arranging a seepage prevention panel on an upstream face is avoided, the construction is simplified, and the construction period is shortened.
Description
Technical field
The present invention relates to a kind of glue of crossing set up based on old dam and coagulate loose rock dam and construction method thereof, belong to structure and the technical field of construction of gelling loose rock dam.
Background technology
The main body of loose rock dam is with gravel embankment, is equipped with the dam that impervious body builds up; It is the one of earth and rockfill dam.The advantage on this dam to make full use of local natural materials, and can adapt to different geological conditionss, construction method is easier, and anti-seismic performance is good; Its deficiency generally need arrange construction diversion and flood releasing structure outside dam, and loose rock dam are after the certain time limit of use, and dam body there will be the problems such as crack, seepage, erosion attack, has a strong impact on the intensity of dam, stable and durability.Loose rock dam are widely used, and after problem, just remove, reconstruct, cost is very high, and construction period is long, administer bring very large difficulty to water conservancy.
And small power station in rural water retaining structure mostly is homogeneous earth dam, running for many years, there is the problems such as crack, seepage, erosion attack in earth dam, has a strong impact on the intensity of dam, stable and durability, affects performance and the safety of rural small hydropower project benefit.Therefore, dam body seepage, fluid erosion prevention process and reinforcement transformation need be carried out to homogeneous earth dam.
Small power station in rural water retaining structure mostly is homogeneous earth dam, and run for many years, the problems such as crack, seepage, erosion attack appear in earth dam, has a strong impact on the intensity of dam, stable and durability, affects performance and the safety of rural small hydropower project benefit.Therefore, dam body seepage and fluid erosion prevention process need be carried out to homogeneous earth dam to improve standard and reinforcement transformation.
Summary of the invention
In order to solve above-mentioned Problems existing, the invention discloses the glue of crossing set up based on old dam and coagulate loose rock dam and construction method thereof, its concrete technical scheme is as follows:
The glue of crossing set up based on old dam coagulates loose rock dam, comprises old dam, it is characterized in that surface, described old dam is equipped with cemented gravel dam layer and rock-fill concrete integument from inside to outside successively.
The antiseepage coefficient of described rock-fill concrete integument is 1.025 × 10
-8cm/s ~ 2.087 × 10
-8cm/s.
The thickness of described cemented gravel dam layer is required to be more than 3 times of cement sand and gravel material maximum particle diameter.
The outer side slope of described cemented gravel dam layer is than being 1:0.6 ~ 1:0.8, and the outer side slope of described rock-fill concrete integument can be 1:0.2 to 1:0.
That sets up based on old dam crosses the construction method that glue coagulates loose rock dam, comprises the construction method on surface, Jiu Ba upstream and downstream and the construction method at top, it is characterized in that the construction method on surface, described Jiu Ba upstream and downstream comprises the following steps:
(1) face, storehouse is cleared up: surface, old dam is cleared up;
(2) build upstream template and downstream template: correspondence sets up upstream template and downstream template outside the upstream side and downstream on old dam, described upstream template and downstream template all tilt towards old dam;
(3) enrockment: according to designing requirement width needed for the reserved cemented gravel dam layer in surface, Jiu Ba upstream and downstream, carry out enrockment in the position near upstream template and downstream template by excavator or the crane stockpile met the demands;
(4) fill cement sand and gravel material: between stockpile and surface, Jiu Ba upstream and downstream, fill cement sand and gravel material, form the cemented gravel dam layer on surface, Jiu Ba upstream and downstream;
(5) build automatic close concrete: the cemented gravel dam layer that step (4) is formed and old dam contour time, in upstream template, between downstream template and corresponding cemented gravel dam layer, carry out building of automatic close concrete, automatic close concrete is filled in the gap between stockpile, form rock-fill concrete, form the rock-fill concrete integument on surface, Jiu Ba upstream and downstream;
The construction method in described old dam crest portion comprises the following steps:
A () piles the dam crest on high old dam: the both sides stockpile enrockment of the dam crest on old dam, and builds with automatic close concrete, fills between the enrockment of the dam crest both sides on old dam with cement sand and gravel material;
(b) enrockment dam crest: when step (a) reaches height corresponding to design, stop filling cement sand and gravel material, use stockpile enrockment between upstream template and downstream template;
C () builds dam crest automatic close concrete: on the enrockment of the dam crest of step (b) gained, build automatic close concrete, and concrete enters into the gap of enrockment, forms rock-fill concrete, forms the rock-fill concrete integument of dam crest;
D () removes upstream template and downstream template.
In the construction method step (4) on surface, described Jiu Ba upstream and downstream, cement sand and gravel material constantly vibrates in casting process, and cement sand and gravel material part is clamp-oned in the gap of old dam surface gaps and stockpile.
The rock-fill concrete compressive strength that described step (5) is formed reaches 2.5Mpa, just can carry out step (6).
Rock-fill concrete (RFC), the enrockment by Large stone directly puts in storage, and then builds special automatic close concrete, fills stockpile space, forms rock-fill concrete.Rock-fill concrete adopts local enrockment as aggregate, reduces cement consumption, saves cost, and speed of application is fast, can effectively reduce the concrete heat of hydration, and have technique simple, construction link is few, can be used as homogeneous earth dam dam body seepage material and fluid erosion prevention material.
Cement sand and gravel material (CSG) adds water and cementitious material by the materials such as the channel sand gravel being easy near dam site obtain or excavation waste, then mixes and stirs with easy equipment, obtain a kind of dam material.This material is built a dam, and to have gel material content few, and cost is low, and heat of hydration temperature rise is low; Make full use of excavation waste, channel sand gravel, simplify preparation section, reduce costs, reduce the pollution to environment, can be used as homogeneous earth dam dam body fluid erosion prevention material.Because dam body requires only water and common cement sand and gravel material (CSG) anti-permeability performance is slightly poor, therefore take extra seepage control measure with common cement sand and gravel material (CSG) as needing downstream face thereon during dam body materials.
The present invention is based on cement sand and gravel material (CSG) and rock-fill concrete (RFC) two kinds of dam material pluses and minuses, the cement sand and gravel proposing a kind of old dam is set up mixes overflow dam and construction method thereof.Method of the present invention carries out combining building a dam with existing old dam for adopting rock-fill concrete and cement sand and gravel, and carry out cement sand and gravel material in close old dam part and fill, outermost layer builds rock-fill concrete, can play the advantage of bi-material simultaneously.
Patent of the present invention has the following advantages:
1. the present invention reinforces at Jiu Bashang, comparatively rebuilds new dam and reduces engineering quantity.
2. the present invention can carry out water level and crosses water higher than the flood of dam crest and regulate.
3. rock-fill concrete of the present invention and cement sand and gravel material all adopt local material to reduce costs, and can reduce the pollution to environment.
4. present invention achieves rock-fill concrete and the rapid construction on old dam foundation plinth of cement sand and gravel material, save the operation that upstream face arranges face slab for water retaining, simplify construction, reduction of erection time.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention,
Fig. 2 is enrockment of the present invention and the view of filling cement sand and gravel material,
Fig. 3 is the view after the present invention builds automatic close concrete,
Fig. 4 is the view that the present invention completes the construction of old dam crest portion,
Reference numerals list: 1-old dam, 2-cemented gravel dam layer, 3-rock-fill concrete integument, 4-upstream template, 5-downstream template, 6-stockpile, 7-cement sand and gravel material, 8-automatic close concrete.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further.Following detailed description of the invention should be understood only be not used in for illustration of the present invention and limit the scope of the invention.It should be noted that, these accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Fig. 1 is structural representation of the present invention, visible by reference to the accompanying drawings, and this glue of crossing of foundation based on old dam 1 coagulates loose rock dam, and comprise old dam 1, surface, described old dam 1 is equipped with cemented gravel dam layer 2 and rock-fill concrete integument 3 from inside to outside successively.The antiseepage coefficient of described rock-fill concrete integument 3 is 1.025 × 10
-8cm/s ~ 2.087 × 10
-8cm/s.The density of rock-fill concrete integument 3 is good, block water can divide and soak inside of the present invention, protection the present invention, life-extending.
The thickness of described cemented gravel dam layer 2 is required to be more than 3 times of cement sand and gravel material 7 maximum particle diameter.Guarantee that cemented gravel dam layer 2 inside can not exist the gap with cemented gravel dam layer 2 thickness not matched size, the arbitrary cross section of cemented gravel dam layer 2 is all relatively closely knit.
The outer side slope of described cemented gravel dam layer 2 is than being 1:0.6 ~ 1:0.8, and the outer side slope of described rock-fill concrete integument 3 can be 1:0.2 to 1:0.
That sets up based on old dam 1 crosses the construction method that glue coagulates loose rock dam, comprises the construction method on surface, upstream and downstream, old dam 1 and the construction method at top, it is characterized in that the construction method on surface, upstream and downstream, described old dam 1 comprises the following steps:
(1) face, storehouse is cleared up: surface, old dam 1 is cleared up;
(2) upstream template 4 and downstream template 5 is built: correspondence sets up upstream template 4 and downstream template 5 outside the upstream side and downstream on old dam 1, and described upstream template 4 and downstream template 5 all tilt towards old dam 1;
(3) enrockment: according to designing requirement width needed for the reserved cemented gravel dam layer 2 in surface, upstream and downstream, old dam 1, carry out enrockment in the position near upstream template 4 and downstream template 5 by excavator or the crane stockpile 6 met the demands;
(4) fill cement sand and gravel material 7: between stockpile 6 and surface, upstream and downstream, old dam 1, fill cement sand and gravel material 7, form the cemented gravel dam layer 2 on surface, upstream and downstream, old dam 1;
(5) automatic close concrete 8 is built: when cemented gravel dam layer 2 and old dam 1 that step (4) is formed are contour, in upstream template 4, between downstream template 5 and corresponding cemented gravel dam layer 2, carry out building of automatic close concrete 8, automatic close concrete 8 is filled in the gap between stockpile 6, form rock-fill concrete, form the rock-fill concrete integument 3 on surface, upstream and downstream, old dam 1;
The construction method at top, described old dam 1 comprises the following steps:
A () piles the dam crest on high old dam 1: both sides stockpile 6 enrockment of the dam crest on old dam 1, and builds with automatic close concrete 8, fills between the enrockment of the dam crest both sides on old dam 1 with cement sand and gravel material 7;
(b) enrockment dam crest: when step (a) reaches height corresponding to design, stop filling cement sand and gravel material 7, with stockpile 6 enrockment between upstream template 4 and downstream template 5;
C () builds dam crest automatic close concrete 8: on the enrockment of the dam crest of step (b) gained, build automatic close concrete 8, and concrete enters into the gap of enrockment, forms rock-fill concrete, forms the rock-fill concrete integument 3 of dam crest;
D () removes upstream template 4 and downstream template 5.
In the construction method step (4) on surface, upstream and downstream, described old dam 1, cement sand and gravel material 7 constantly vibrates in casting process, and cement sand and gravel material 7 part is clamp-oned in the gap of old dam 1 surface gaps and stockpile 6.
The rock-fill concrete compressive strength that described step (5) is formed reaches 2.5Mpa, just can carry out step (6).
The present invention, by filling automatic close concrete 8 in stockpile 6, play the effect of antiseepage, simplify construction, be positioned at the cemented gravel dam layer 2 on surface, old dam 1, permeate poor, the intensity in the 28 day length of time is about 4Mpa, for about 3 times of normal sands gravel material, in the present invention mainly as reinforcement material; The height that glue excessively of the present invention coagulates loose rock dam determines rational height according to the geographical environment of construction.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, also comprises the technical scheme be made up of above technical characteristic.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on manual, must determine its technical scope according to right.
Claims (7)
1. the glue of crossing set up based on old dam coagulates loose rock dam, comprises old dam, it is characterized in that surface, described old dam is equipped with cemented gravel dam layer and rock-fill concrete integument from inside to outside successively.
2. the glue of crossing set up based on old dam according to claim 1 coagulates loose rock dam, it is characterized in that the antiseepage coefficient of described rock-fill concrete integument is 1.025 × 10
-8cm/s ~ 2.087 × 10
-8cm/s.
3. the glue of crossing set up based on old dam according to claim 2 coagulates loose rock dam, it is characterized in that the thickness of described cemented gravel dam layer is required to be more than 3 times of cement sand and gravel material maximum particle diameter.
4. the glue of crossing set up based on old dam according to claim 3 coagulates loose rock dam, and it is characterized in that the outer side slope of described cemented gravel dam layer than being 1:0.6 ~ 1:0.8, the outer side slope of described rock-fill concrete integument can be 1:0.2 to 1:0.
5. coagulate the construction method of loose rock dam according to the arbitrary described glue excessively set up based on old dam of claim 1 ~ 4, comprise the construction method on surface, Jiu Ba upstream and downstream and the construction method at top, it is characterized in that the construction method on surface, described Jiu Ba upstream and downstream comprises the following steps:
(1) face, storehouse is cleared up: surface, old dam is cleared up;
(2) build upstream template and downstream template: correspondence sets up upstream template and downstream template outside the upstream side and downstream on old dam, described upstream template and downstream template all tilt towards old dam;
(3) enrockment: according to designing requirement width needed for the reserved cemented gravel dam layer in surface, Jiu Ba upstream and downstream, carry out enrockment in the position near upstream template and downstream template by excavator or the crane stockpile met the demands;
(4) fill cement sand and gravel material: between stockpile and surface, Jiu Ba upstream and downstream, fill cement sand and gravel material, form the cemented gravel dam layer on surface, Jiu Ba upstream and downstream;
(5) build automatic close concrete: the cemented gravel dam layer that step (4) is formed and old dam contour time, in upstream template, between downstream template and corresponding cemented gravel dam layer, carry out building of automatic close concrete, automatic close concrete is filled in the gap between stockpile, form rock-fill concrete, form the rock-fill concrete integument on surface, Jiu Ba upstream and downstream;
The construction method in described old dam crest portion comprises the following steps:
A () piles the dam crest on high old dam: the both sides stockpile enrockment of the dam crest on old dam, and builds with automatic close concrete, fills between the enrockment of the dam crest both sides on old dam with cement sand and gravel material;
(b) enrockment dam crest: when step (a) reaches height corresponding to design, stop filling cement sand and gravel material, use stockpile enrockment between upstream template and downstream template;
C () builds dam crest automatic close concrete: on the enrockment of the dam crest of step (b) gained, build automatic close concrete, and concrete enters into the gap of enrockment, forms rock-fill concrete, forms the rock-fill concrete integument of dam crest;
D () removes upstream template and downstream template.
6. the glue excessively set up based on old dam according to claim 5 coagulates the construction method of loose rock dam, it is characterized in that in the construction method step (4) on surface, described Jiu Ba upstream and downstream, cement sand and gravel material constantly vibrates in casting process, and cement sand and gravel material part is clamp-oned in the gap of old dam surface gaps and stockpile.
7. the glue excessively set up based on old dam according to claim 6 coagulates the construction method of loose rock dam, it is characterized in that the rock-fill concrete compressive strength that described step (5) is formed reaches 2.5Mpa, just can carry out step (6).
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Cited By (6)
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| CN104929081A (en) * | 2015-06-10 | 2015-09-23 | 北京华石纳固科技有限公司 | Enrockment concrete permeable dike and construction method thereof |
| CN107700435A (en) * | 2017-09-30 | 2018-02-16 | 清华大学 | The cementing rock-fill dams of rock-fill concrete core-wall and its construction method |
| CN110130278A (en) * | 2019-05-29 | 2019-08-16 | 中国水利水电科学研究院 | A kind of cementing rock-fill dams and its construction method |
| CN110468794A (en) * | 2019-07-24 | 2019-11-19 | 南通大学 | A kind of novel ecological permeable dike and its construction method |
| CN112962537A (en) * | 2021-03-08 | 2021-06-15 | 中国水电基础局有限公司 | Integrated pouring method for self-compacting rock-fill concrete dam body |
| CN113897912A (en) * | 2021-10-16 | 2022-01-07 | 浙江钱塘江水利建筑工程有限公司 | Rock-fill concrete masonry structure and construction method thereof |
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| CN104929081A (en) * | 2015-06-10 | 2015-09-23 | 北京华石纳固科技有限公司 | Enrockment concrete permeable dike and construction method thereof |
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| CN110468794A (en) * | 2019-07-24 | 2019-11-19 | 南通大学 | A kind of novel ecological permeable dike and its construction method |
| CN112962537A (en) * | 2021-03-08 | 2021-06-15 | 中国水电基础局有限公司 | Integrated pouring method for self-compacting rock-fill concrete dam body |
| CN113897912A (en) * | 2021-10-16 | 2022-01-07 | 浙江钱塘江水利建筑工程有限公司 | Rock-fill concrete masonry structure and construction method thereof |
| CN113897912B (en) * | 2021-10-16 | 2022-07-26 | 浙江钱塘江水利建筑工程有限公司 | Rock-fill concrete masonry structure and construction method thereof |
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