CN101748756B - Method for laying anti-seepage geomembrane - Google Patents
Method for laying anti-seepage geomembrane Download PDFInfo
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- CN101748756B CN101748756B CN2010100114358A CN201010011435A CN101748756B CN 101748756 B CN101748756 B CN 101748756B CN 2010100114358 A CN2010100114358 A CN 2010100114358A CN 201010011435 A CN201010011435 A CN 201010011435A CN 101748756 B CN101748756 B CN 101748756B
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Abstract
The invention relates to a method for laying anti-seepage geomembrane, which comprises the following steps: purposefully dividing a large-scale composite geomembrane into independent unit projects in advance; then laying the unit geomembranes while forming a unit airtight interval between the unit geomembrane and ground water and keeping certain vacuum degree. The method may directly break the conditions for inflation damage after the geomembrane is loaded, effectively prevent the inflation damage, conveniently and immediately detect and maintain the unit geomembrane and ensure strong operability and practicability.
Description
Technical field
The present invention relates to a kind of method for laying anti-seepage geomembrane, relate in particular to a kind of method for laying anti-seepage geomembrane with nondestructive testing and inflatable pre-treatment step.
Background technology
Geosynthetics is widely used in fields such as water conservancy, railway, harbour, speedway, urban construction and ecological environment, and its function mainly comprises antiseepage, reinforcement, filtering layer and draining (gas), isolation and protective effect etc.
Composite geo-membrane is as antiseepage type geosynthetics, be with plastic sheeting as the antiseepage base material, with the non-woven fabric compounded waterproof geotechnological impervious material that forms, wherein film plays waterproof, antiseepage effect, geotextile plays draining (gas), reinforced action.Because it has tension and advantage such as barrier performance is good, deformability is strong, integral body or local seepage control projects such as hydraulic structure such as reservoir area, dam body, cofferdam and garbage disposal plant now have been widely used in.
In geomembrane anti-seepage engineering previously, be subjected to the restriction of execution conditions, all should under comparatively dry environment, carry out the film body welding and lay.General, between geomembrane and the groundwater table unsaturated soil state, fixed its gas will be difficult to freely discharge under the imposed load effect.Particularly under the groundwater table conditions of higher of place, must the artificial dewatering when film body is laid, after film body is laid and finished, groundwater table will be replied, and the gas in the unsaturation soil body is sealed being forced to property up for safekeeping.Behind load application on the film body, as: reservoir filling, will produce subsidiary stress to unsaturated soil under the film, impel the fixed and exhaust of this part soil body sedimentation, owing to do not possess the anisotropy of free exhaust condition and ground, can cause the assembly of gas irregularities.When the load difference surpasses film body intensity on gas pressure of assembling and the film, will cause the film body inflatable to be destroyed, serious caused geomembrane anti-seepage engineering failure.At present, the solution of this problem is few, as outlet valve is set, but its specific aim, practicality, economic index are difficult to estimate.
Along with fast development of national economy, large-scale water storage project, bulky refuse treatment project etc. has obtained fast development.Adopt geomembrane more and more many, and the use scale is more and more big as the antiseepage body.The actual usable floor area of present single engineering surpasses 1.0 square kilometres, and construction project to be built plan usable floor area will be above 5.0 square kilometres.A large amount of use geomembrane like this, its raw material are produced, transit link, and geomembrane is laid damage such as the appearance of welding link and is inevitable.Except that weld seam, geo-membrane material integrality, geomembrane welding body integrality still do not have effective nondestructive testing, repairing means and estimate foundation.Up to now, extensive impermeable composite geomembrane system, the runtime does not have effective monitoring means, and seepage prevention system in case destroy can not be repaired substantially.
Summary of the invention
The present invention be directed to the existing in prior technology shortcoming, and provide a kind of method for laying anti-seepage geomembrane, adopt in this method and form between the unit air-tight section in the unit geomembrane, by to keeping certain vacuum between the unit air-tight section, can finish nondestructive testing and inflatable preliminary treatment to geomembrane in the time of by this laying method, its laying method is simple, workable, practical.
The present invention realizes by following technical measures: a kind of method for laying anti-seepage geomembrane, it comprises the steps:
1., in advance large-scale composite geo-membrane is divided into separately independently element project, lay then,
2., make between unit geomembrane and the underground water and to form between the unit air-tight section,
3., the outer skirt that is communicated with between setting and unit air-tight section, and by vacuum withdraw device, the gas of extracting unit airtight space also forms the vacuum of 10～80kPa.
The beneficial effect of this programme can be learnt according to the narration to such scheme, owing on purpose in advance large-scale composite geo-membrane is divided into separately independently element project, lay then, and make between unit geomembrane and the underground water and to form between the unit air-tight section and keep certain vacuum, this laying method can be found easily that in time the unit geomembrane is whether complete and can in time repair like this by airtight space being adopted vacuum maintenance detection method, and then determine whether whole geomembrane is complete, guarantee the quality of engineering; By control to vacuum under the film, groundwater table is risen side by side except that the gas in the unsaturated soil body, directly destroy geomembrane and load the condition that the back inflatable is destroyed, effectively prevent inflatable destruction, have this as seen, the 3rd step of this laying method can be finished nondestructive testing and pretreated two targets of inflatable simultaneously.Adopt this programme in the seepage control project runtime, can make things convenient for and in time the unit geomembrane be detected and safeguard, workable, practical.
The present invention efficiently solves following problems,
1. provide extensive geomembrane to lay the detection method and the objective evaluation foundation of not damaged, seamless, system.
2. utilize the method for detecting the breaking point air-flow, can specifically search damaged point of unit geomembrane and repairing in time, guarantee the integrality and the reliability of seepage control project.
3. the control of vacuum under the film can directly destroy geomembrane and load the condition that the back inflatable is destroyed, and effectively prevents inflatable destruction.
4. can directly observe the duty of operating geomembrane anti-seepage system, and make objective evaluation in view of the above.
5. by skirt outside the unit, can damage the geomembrane of emerged in operation and carry out the specific aim repairing.
The specific embodiment
For clearly demonstrating the technical characterstic of this programme,, this programme is set forth below by the specific embodiment an of the best.
The present invention is a kind of method for laying anti-seepage geomembrane, and it comprises the steps:
1., in advance large-scale composite geo-membrane is divided into separately independently element project, lay then,
2., make between unit geomembrane and the underground water and to form between the unit air-tight section,
3., the outer skirt that is communicated with between setting and unit air-tight section, and by vacuum withdraw device, the gas of extracting unit airtight space also forms the vacuum of 10～80kPa.
Be example with the big village of construction project to be built reservoir below, the economic benefit that this programme brings is described.
Big village reservoir is one of domestic regulating reservoir in south water to north East Route Project Shandong, design top water level 29.80m, corresponding maximum storage capacity 5,209 ten thousand m
3, design level of dead water 21.00m, minimum capacity of a reservoir 7,450,000 m
3, reservoir is regulated storage capacity 4,464 ten thousand m
3Reservoir box dam axis of dam length overall 8913.99m, about 6.5 square kilometres of the total floor space of reservoir engineering.
Whole box dam is not considering under the situation of seepage control measure that reservoir mean water year leakage reaches 1202.3 ten thousand m
3, account for 23.4% of aggregate storage capacity, account for 9.27% of year warehouse-in water yield, seepage is serious; Downstream row ditch, favorable to the people river, Liu Wuhe go out ease and are 0.55 to the maximum than falling, and, cause the dam seepage failure easily and break down than falling much larger than the infiltration permission of fissured clay and sandy loam.Therefore reservoir must be taked reliable seepage control measure.Reservoir adopts full storehouse to lay the impermeable composite geomembrane scheme.
Adopt the present invention, can eliminate the defective leakage is 440.4 ten thousand m
3/ year, by 1.623 yuan of calculating of every side's water (price cost), can reduce the loss every year about 714.7692 ten thousand yuan; Can eliminate inflatable and destroy seepage control project inefficacy or the partial failure that is caused, consider, can reduce about 6,000,000 m of water loss by crash rate 50%
3/ year, annual economic benefit can reach about 1,000 ten thousand yuan.Along with the understanding of water resource as strategic resource improves constantly, water price will further improve, and economic benefit of the present invention will be more remarkable.
The present invention can pass through existing techniques in realizing without the technical characterictic of describing, and does not repeat them here.Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (1)
1. method for laying anti-seepage geomembrane, it comprises the steps:
1., in advance large-scale geomembrane is divided into separately independently element project, lay then,
2., make between unit geomembrane and the underground water and to form between the unit air-tight section,
3., the outer skirt that is communicated with between setting and unit air-tight section, and by vacuum withdraw device, the gas of extracting unit airtight space also forms the vacuum of 10～80kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100114358A CN101748756B (en) | 2010-01-13 | 2010-01-13 | Method for laying anti-seepage geomembrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100114358A CN101748756B (en) | 2010-01-13 | 2010-01-13 | Method for laying anti-seepage geomembrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101748756A CN101748756A (en) | 2010-06-23 |
| CN101748756B true CN101748756B (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010100114358A Expired - Fee Related CN101748756B (en) | 2010-01-13 | 2010-01-13 | Method for laying anti-seepage geomembrane |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1482304A (en) * | 2002-09-09 | 2004-03-17 | 新疆西龙土工新材料股份有限公司 | Method of laying, welding and construction of canal seepage proof film |
| US20060002764A1 (en) * | 2002-09-30 | 2006-01-05 | Legge Kelvin R | Geotechnical barrier |
| CN101463657A (en) * | 2007-12-17 | 2009-06-24 | 贵阳铝镁设计研究院 | Manufacturing method of industrial impounding reservoir |
-
2010
- 2010-01-13 CN CN2010100114358A patent/CN101748756B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1482304A (en) * | 2002-09-09 | 2004-03-17 | 新疆西龙土工新材料股份有限公司 | Method of laying, welding and construction of canal seepage proof film |
| US20060002764A1 (en) * | 2002-09-30 | 2006-01-05 | Legge Kelvin R | Geotechnical barrier |
| CN101463657A (en) * | 2007-12-17 | 2009-06-24 | 贵阳铝镁设计研究院 | Manufacturing method of industrial impounding reservoir |
Non-Patent Citations (1)
| Title |
|---|
| 周骞等.输水明渠防渗土工膜的施工.《水利建设与管理》.2007,(第11期),25-28，34. * |
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| CN101748756A (en) | 2010-06-23 |
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Granted publication date: 20110921 Termination date: 20220113 |