CN202577233U

CN202577233U - River bottom impervious structure of geomembranes

Info

Publication number: CN202577233U
Application number: CN 201220202645
Authority: CN
Inventors: 潘瑞; 李江峰; 于德发; 王玉磊
Original assignee: BEIJING ZHENGHE HENGJI BINSHUI ECOLOGY ENVIRONMENTAL MANAGEMENT Co Ltd
Current assignee: BEIJING ZHENGHE HENGJI BINSHUI ECOLOGY ENVIRONMENTAL MANAGEMENT Co Ltd
Priority date: 2012-05-08
Filing date: 2012-05-08
Publication date: 2012-12-05
Anticipated expiration: 2022-05-08

Abstract

The utility model relates to a river bottom impervious structure of geomembranes. The river bottom impervious structure comprises a geomembrane layer and a geomembrane protection layer sequentially paved on a consolidated substrate. The geomembrane layer is composed of a plurality of the geomembranes spliced by a thermofussion welding method. The geomembrane comprises a composite geomembrane, the composite geomembrane comprises two clothes and one film, the geomembrane layer also comprises a geotechnical cloth paved tightly close to the geomembrane layer, the geotechnical cloth comprises a bottom layer cloth and an upper layer cloth, the geotechnical clothes are sewn to be connected, and the geomembrane protection layer comprises a loam layer and a cobble layer which are sequentially paved. The river bottom impervious structure is simple in structure, favorable in impervious effect after pavement, long in service life and simple in pavement and is suitable for large-scale popularization and application. The river bottom impervious structure can be used for 40 years to 50 years and does not leak under the condition of clear water, as well as can be used for 30 years to 40 years and does not leak under the condition of waste water.

Description

The river bed leakage preventing structure of geomembrane

Technical field

The utility model relates to a kind of river bed leakage preventing structure, and especially a kind of river bed leakage preventing structure that adopts geomembrane is mainly used in the river bed seepage control project.

Background technology

At present, the enhancing of Along with people's environmental consciousness, the application of geomembrane in the river bed antiseepage is handled is more and more widely.But present geomembrane anti-seepage structure also has following shortcoming: 1, geomembrane is damaged easily, and especially the puncture resistance for the various plants root system is lower, leaks easily, and application life is short; 2, geomembrane is changed frequently, and constructional difficulties when changing geomembrane, replacement cost are too high; 3, undesirable for the antiseepage treatment effect of current water; 4, lay the cost height, be not suitable for large-area construction.

The utility model content

In order to overcome the above-mentioned defective of prior art, the purpose of the utility model is to provide a kind of river bed leakage preventing structure of geomembrane, can improve anti-seepage effect, cracky not, and long service life is laid simply, and cost is low, can use on a large scale.

The main technical schemes that the utility model adopts is:

A kind of river bed leakage preventing structure of geomembrane is included in geotechnological rete and the geomembrane overcoat laid successively in the substrate of compacting.

Said geotechnological rete is spliced by some geomembranes.

The geomembrane that is layed in the upper reaches can overlap on the geomembrane in downstream.

Said geomembrane comprises composite geo-membrane.

Said composite geo-membrane can be a cloth two films, a cloth one film or two cloth, one film.

Said geotechnological rete also comprises is close to the geotextiles that said composite geo-membrane is laid.

Said geotextiles is to be layed in the bottom cloth below the said composite geo-membrane and/or to be layed in the upper strata cloth above the said composite geo-membrane.

Can glued joint or sweat soldering between the plastic foil of said composite geo-membrane, between the cloth of said composite geo-membrane, can sew up each other between the said geotextiles.

Above-mentioned any described river bed leakage preventing structure is preferably, and said geomembrane overcoat comprises loam layer and the cobble layer of laying successively.

Soil in the said loam layer is not more than the fine earth that sieves of 3mm for particle diameter.

The beneficial effect of the utility model is:

Because geomembrane is laid in the substrate of compacting, helps to prevent the substrate sedimentation, has reduced in the long-term use of geomembrane after laying and broken, for permanent being suitable for of geomembrane laid good basis because of hydraulic pressure, substrate sedimentation etc. causes;

Owing to be provided with the geotextiles that can improve the geomembrane mechanical performance in the above and below of geomembrane, particularly, can geotextiles be set again in the above and below of composite geo-membrane; Both improved the tensile property of geomembrane; Can play the certain protection effect to geomembrane again, prevent that external force from causing the damage of geomembrane, and; Can select specific geotextiles to lay according to actual needs, satisfy the needs under the multiple situation;

Owing on geomembrane, also laid loam layer and boulder bed as the geomembrane overcoat, not only can alleviate geomembrane and corroded, like the erosion to geomembrane such as various chemical pollutants, ultraviolet ray by the external world; Improved the application life of geomembrane; And, can also make the geomembrane of laying more firm, improved application life; Reduce maintenance costs such as replacing, be suitable for large-area applications.

Description of drawings

Fig. 1 is the cross-sectional structure sketch map of an embodiment of the utility model;

Fig. 2 is the laying sequential schematic (solid arrow is represented water (flow) direction among the figure, and dotted arrow is represented the laying order of geotechnological rete) of geotechnological rete of an embodiment of the utility model;

Fig. 3 is the geomembrane connecting method sketch map of an embodiment of the utility model.

The specific embodiment

, through the specific embodiment the utility model is described in more detail the utility model in order better to explain below in conjunction with accompanying drawing so that better understand.

Referring to Fig. 1 to Fig. 3, the utility model provides a kind of river bed leakage preventing structure of geomembrane, is included in the geotechnological rete 8 and geomembrane overcoat laid successively in the substrate 1 of compacting.

Said geotechnological rete is spliced by some geomembranes 4.

The geomembrane that is layed in the upper reaches can overlap on the geomembrane in downstream.The lap-joint 42 of upper reaches geomembrane and downstream geomembrane can weld or not weld, and lap width is preferably and is not less than 20cm.

Said geomembrane comprises composite geo-membrane 10.

Said geotextiles is preferably nonwoven.Because nonwoven is a kind of polymeric staple fiber dimension chemical material; Normally through acupuncture or heat is sticking is shaped, have advantages of higher tensile strength and extensibility, it is with after geomembrane combines; The tensile strength and the anti-puncture ability of geomembrane have not only been increased; And, also increased the friction factor of contact surface because nonwoven surface is coarse, help relatively stable between geomembrane and the geotextiles.

Said geotextiles is to be layed in the bottom cloth 14 below the said composite geo-membrane and/or to be layed in the upper strata cloth 13 above the said composite geo-membrane.

Seam between seam between the cloth of said composite geo-membrane and the said geotextiles is preferably the certain distance that staggers, with mechanical performance and the whole anti-seepage effect that improves geotechnological rete.

Common Type of Welding is two welding beads.

The lap width of thermofussion welding place is not less than 10cm usually.Be preferably and be not less than 12.5cm, to obtain best cost performance.

The method of said geomembrane continuous laying can for: with N width of cloth geomembrane 40 lay finish after; Folded certain-length is oppositely turned on the limit of need welding, and being preferably and oppositely turning over folded length is 60cm ± 5cm, N+1 width of cloth geomembrane oppositely is layed on the N width of cloth geomembrane again; Adjust the lap width of two width of cloth geomembranes; With the welding of two width of cloth geomembranes, after the welding upset of N+1 width of cloth geomembrane is forward after the adjustment, continues laying and get final product.

Seaming position 41 (being the welding position) between adjacent two width of cloth geomembranes certain distance that should stagger is preferably and is not less than 1m.

When the upper and lower surface of said geomembrane all was equipped with said geotextiles, the continuous laying method of said geotechnological rete was: lay N width of cloth lower floor cloth 3, re-lay N width of cloth geomembrane; Re-lay N width of cloth upper strata cloth 5, weld N+1 width of cloth geomembrane again, sew up N+1 width of cloth lower floor cloth again; Re-lay N+1 width of cloth lower floor cloth; Re-lay N+1 width of cloth geomembrane, weld N+1 width of cloth upper strata cloth again, re-lay N+1 width of cloth upper strata cloth.

Said fabric adopts portable sack closer (being closer) to sew up, and adopts the high tenacity polyester fiber silk thread, and the needle gage during stitching is 6mm ± 1mm.

Above-mentioned any described river bed leakage preventing structure is preferably, and said geomembrane overcoat comprises the loam layer of laying successively 6 and cobble layer 7.

The impurity that should not contain easy damaged geomembranes such as weeds, wood, stone in the said loam layer.

Be preferably with the main component of fine earth material of sieving as the loam layer.

Be preferably soil in the said loam layer is not more than 3mm for particle diameter the fine earth that sieves.

Be preferably the closer to the earth material of geotechnological rete thin more.

The earth material that is preferably near said geotechnological rete is a clay.

Said loam layer is laid artificial compacting in back and/or small machine compacting, is preferably compaction in layers.

The degree of compaction of said loam layer is not less than 0.96.

Said earth the thickness of the layer is not less than 20cm.

Said substrate rolls at the bottom of the moisture-free basis real, and in the certain depth scope, the compacted density of the soil matrix of undisturbed soil is not less than 0.85, and the relative density of the husky base of undisturbed soil is not less than 0.65, and the 3:7 graded sand and stone rams the compacted density of banketing and is not less than 0.96.

Be preferably substrate especially basal plane 2 (promptly be used to lay the surface of geotechnological rete, be called for short basal plane) do not contain foreign material.

Said foreign material comprise various hard thing, the pricking objects that easily geomembrane caused damage such as sharp stone, tile, fragment of brick, glass, branch and tree root.

Since substrate particularly the cleaning of substrate surface for guaranteeing that good anti-seepage effect is most important; Be the key that improves anti-seepage effect, therefore, the substrate particularly various foreign material of basal plane must thoroughly be removed totally; Even do not allow basal plane that local concavo-convex phenomenon is arranged; Especially coup injury geomembrane easily such as sharp stone in addition, is passed in time easily to grow gradually and have for tree root etc. and is pierced through the dangerous foreign material of geomembrane and also must remove; Eliminate long-term hidden danger, prolong effective antiseepage life-span of geomembrane.

The utility model simple in structure, construction easily, and the anti-seepage effect after laying is good; Long service life, can use under the clear water condition 40 years～50 years non-leakage, can use under the sewage condition 30 years～40 years non-leakage; And lay with low costly, be applicable to large-scale promotion application.

Claims

1. the river bed leakage preventing structure of a geomembrane is characterized in that being included in geotechnological rete and the geomembrane overcoat of laying successively in the substrate of compacting.

2. river bed according to claim 1 leakage preventing structure is characterized in that said geotechnological rete is spliced by some geomembranes.

3. river bed according to claim 2 leakage preventing structure, the geomembrane overlap joint that it is characterized in that being layed in the upper reaches is on the geomembrane in downstream.

4. river bed according to claim 3 leakage preventing structure is characterized in that said geomembrane comprises composite geo-membrane.

5. river bed according to claim 4 leakage preventing structure is characterized in that said composite geo-membrane is a cloth two films, a cloth one film or two cloth, one film.

6. river bed according to claim 5 leakage preventing structure is characterized in that said geotechnological rete also comprises the geotextiles of being close to said composite geo-membrane laying.

7. river bed according to claim 6 leakage preventing structure is characterized in that said geotextiles is to be layed in the bottom cloth below the said composite geo-membrane and/or to be layed in the upper strata cloth above the said composite geo-membrane.

8. river bed according to claim 7 leakage preventing structure is characterized in that glueing joint or sweat soldering between the plastic foil of said composite geo-membrane, sews up each other between the cloth of said composite geo-membrane, between the said geotextiles.

9. according to claim 1,2,3,4,5,6,7 or 8 described river bed leakage preventing structures, it is characterized in that said geomembrane overcoat comprises loam layer and the cobble layer of laying successively.

10. river bed according to claim 9 leakage preventing structure is characterized in that the soil in the said loam layer is not more than the fine earth that sieves of 3mm for particle diameter.