CN111395409A - Seepage-proofing structure for emergency site construction and construction method of seepage-proofing structure - Google Patents
Seepage-proofing structure for emergency site construction and construction method of seepage-proofing structure Download PDFInfo
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- CN111395409A CN111395409A CN202010375638.9A CN202010375638A CN111395409A CN 111395409 A CN111395409 A CN 111395409A CN 202010375638 A CN202010375638 A CN 202010375638A CN 111395409 A CN111395409 A CN 111395409A
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Abstract
The invention discloses an anti-seepage structure for construction of an emergency site and a construction method of the anti-seepage structure, wherein the anti-seepage structure comprises a flat compacted base layer, a compacted clay layer, a composite anti-seepage layer, an upper protection layer and a fine sand cushion layer which are sequentially arranged from bottom to top, the composite anti-seepage layer comprises a GC L pad and a HDPE geomembrane which are sequentially arranged from bottom to top.
Description
Technical Field
The invention relates to the technical field of site seepage prevention, in particular to an seepage prevention structure for construction of emergency sites such as medical treatment and a construction method of the seepage prevention structure.
Background
Site seepage prevention is an important component of conventional building engineering and is related to the use safety and service life of buildings/structures. Similarly, site seepage prevention is indispensable important engineering content in the construction of emergency projects such as medical treatment and the like, can effectively prevent the disordered migration of domestic sewage, medical wastewater and polluted surface water generated by medical activities, can effectively inhibit the diffusion of pathogens to the outside while reducing the environmental risk, and thus realizes the safety protection of site environment and crowd health.
The anti-seepage structure design of emergency sites for medical treatment and the like is different from conventional buildings and municipal engineering, and not only needs to face the common problem of service of an anti-seepage system of the site, but also ensures the reliability, durability and safety of the anti-seepage system in certain special service environments (such as special water environments, stress environments, infection environments and the like). Meanwhile, due to the particularity of an emergency project, the anti-seepage structure of the field also has the characteristics of short construction period, convenience and quickness in construction, convenience in material allocation, easiness in quality control and the like, so that the practical requirement of rapid construction is met.
Xujianling et al mentioned in the protective structure layer for preventing ground pollution in their research, a mixture of cement, water glass, fly ash, hydrated lime and precipitated slurry is used as a hardened layer, and a PE film with the thickness of 0.01-0.25 mm is selected as a pollutant leakage protective layer of a field; the research of Shehrui et al on 'a pollution blocking structure and method constructed based on an anti-seepage system' provides that the pollution blocking effect can be realized by using a liquid drainage guide layer, a protective layer, an anti-seepage layer, a compacted soil cushion layer and a compacted garbage layer as basic structure layers for expanding the volume of a landfill site; in the landfill site with the anti-seepage function researched by the super-built forest et al and the anti-seepage structure with the double-layer HDPE (high-density polyethylene) film composite lining for the domestic garbage landfill site with large seepage quantity researched by the Xinxin et al, composite anti-seepage layers with double-layer film structures and the like are provided according to the characteristics of application sites.
The defects of the prior art are as follows:
the existing site seepage-proofing research mainly focuses on pollution prevention and control of landfill sites and chemical sites, and the designed seepage-proofing layer has a complex structure; meanwhile, the hardened layer using cement as a main material has the problems of long maintenance period and complicated construction, and is not favorable for the control of the construction period.
In contrast, at present, no related research and report on the seepage-proofing structure for construction of emergency sites such as medical treatment and the like exists at home and abroad, and related researchers still seek an emergency site seepage-proofing structure and method which are simple to implement and obvious in effect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an anti-seepage structure for emergency site construction and a construction method of the anti-seepage structure.
The invention discloses an anti-seepage structure for construction of an emergency site, which comprises:
the device comprises a leveling and compacting base layer, a compacting clay layer, a composite impermeable layer, an upper protective layer and a fine sand cushion layer which are arranged from bottom to top in sequence;
the composite impermeable layer comprises a GC L pad and a HDPE geomembrane which are sequentially arranged from bottom to top.
As a further improvement of the invention, a geogrid layer is arranged between the leveling and compacting base layer and the compacting clay layer;
the geogrid layer is a biaxial stretching plastic geogrid, and the tensile strength of the biaxial stretching plastic geogrid per linear meter is not less than 20kN/m in nominal.
As a further improvement of the invention, the degree of compaction of the smooth compacted base layer is not less than 90%;
the thickness of the compacted clay layer is not less than 30cmThe degree of compaction is not less than 90 percent, and the permeability coefficient is not more than 1 × 10- 5cm/s, and the longitudinal and transverse gradients of the compacted clay layer are 2-4%.
As a further improvement of the invention, the GC L pad is attached to an HDPE geomembrane, and the GC L pad has a specification of not less than 4800g/m2And the thickness of the HDPE geomembrane is 1.5-2.0 mm.
As a further improvement of the invention, the upper protective layer is a non-woven geotextile, and the specification of the non-woven geotextile is not less than 600g/m2。
As a further improvement of the invention, the particle size of the fine sand in the fine sand cushion layer is 0.25-0.35 mm, and the thickness of the fine sand cushion layer is not less than 20 cm.
The invention also discloses a construction method of the anti-seepage structure, which comprises the following steps:
compacting the existing site foundation layer to form a smooth compacted foundation layer;
paving clay on the leveling and compacting base layer and compacting to form a compacted clay layer;
sequentially laying a GC L pad and a HDPE geomembrane on the compacted clay layer to form a composite impermeable layer;
laying an upper protective layer on the composite impermeable layer;
and paving fine sand on the upper protective layer to form a fine sand cushion layer.
As a further improvement of the invention, the method also comprises the following steps:
laying a geogrid on the leveling and compacting base layer to form a geogrid layer;
and paving clay on the geogrid layer and compacting to form a compacted clay layer.
As a further improvement of the invention, the GC L cushion is laid in a lap joint mode, the lap joint width is not less than 30cm, bentonite particles are spread in a lap joint area, and the dosage of the bentonite particles is not less than 0.5kg/m2；
The HDPE geomembrane is laid in a lap joint mode, the lap joint width is not less than 120mm, and the lap joint area is welded by a double-seam hot melting method.
As a further improvement of the invention, the method also comprises the following steps:
anchoring the composite impermeable layer; wherein the anchor point is not less than 30cm higher than the leveling and compacting base layer.
Compared with the prior art, the invention has the beneficial effects that:
1. the geotechnical material adopted in the anti-seepage structure has wide sources, is convenient to obtain, can fully meet the special requirements on raw material allocation under the emergency conditions of medical treatment and the like, and has strong pertinence;
2. the seepage-proofing structure can be further provided with a selectable layer, namely a geogrid layer; the concrete characteristics of the field can be further reinforced and reinforced, the bearing capacity of the foundation is improved, the uneven settlement of the field is resisted, and the safety and the stability of the upper-layer structure are improved;
3. the construction method of the anti-seepage structure is convenient to construct and strong in operability, and is matched with the own technical requirements and quality guarantee measures of the earth work materials, so that the anti-seepage effect of the whole project can be conveniently controlled and evaluated;
4. the seepage-proofing structure provided by the invention expands the application of the traditional geotechnical material in the special seepage-proofing field.
Drawings
Fig. 1 is a sectional view of an anti-seepage structure for emergency site construction according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of an anti-seepage structure for emergency site construction according to another embodiment of the invention;
fig. 3 is a flowchart of an impermeable structure construction method for emergency site construction according to an embodiment of the present invention;
fig. 4 is a flowchart of an impermeable structure construction method for emergency site construction according to another embodiment of the present invention.
In the figure:
1. the method comprises the following steps of leveling and compacting a base layer, 2, compacting a geogrid layer, 3, compacting an clay layer, 4, a composite impermeable layer, 401, a GC L pad, 402, a HDPE geomembrane, 5, an upper protective layer and 6, a fine sand cushion layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
example 1:
as shown in figure 1, the invention provides an anti-seepage structure for construction of an emergency site, which comprises a flat and compacted base layer 1, a compacted clay layer 3, a composite anti-seepage layer 4, an upper protective layer 5 and a fine sand cushion layer 6 which are sequentially arranged from bottom to top, wherein the composite anti-seepage layer 4 comprises a GC L pad (sodium bentonite waterproof pad) 401 and a HDPE geomembrane (high density polyethylene geomembrane) 402 which are sequentially arranged from bottom to top.
On the basis of the anti-seepage structure, each layer of the structure is specifically designed as follows:
the leveling and compacting base layer 1 is formed by compacting the existing site base layer, and in order to ensure the anti-seepage effect of the leveling and compacting base layer, the leveling and compacting base layer 1 needs to ensure that the compactness is not less than 90 percent, preferably 93 percent.
The compacted clay layer 3 of the present invention has a thickness of no less than 30cm, preferably 30cm, a degree of compaction of no less than 90%, preferably 90%, and a permeability coefficient of no greater than 1 × 10-5cm/s, preferably 1 × 10-5cm/s; the longitudinal and transverse gradients of the compacted clay layer 3 are 2-4%, preferably 3%, and the surface flatness error of the compacted clay layer 3 after the paving is finished is not more than 2cm/m2And no impurities; the design of the vertical and horizontal slopes of the compacted clay layer 3 is beneficial to the rapid drainage of the infiltration liquid and the reduction of the accumulated water on the composite impermeable layer 4.
The GC L pad 401 and HDPE soil of the inventionThe working film 402 is tightly attached to inhibit the formation of voids, and the specification of the GC L pad 401 is not less than 4800g/m2Preferably 4800g/m2The thickness of the HDPE geomembrane 402 is 1.5-2.0 mm, preferably 2.0mm, the GC L pad 401 is laid in a lap joint mode, the lap joint width is not less than 30cm, preferably 40cm, bentonite particles are spread in a lap joint area of the GC L pad 401, and the using amount of the bentonite particles is not less than 0.5kg/m2Preferably 0.6kg/m2The HDPE geomembrane 402 is laid in a widening lap joint mode, the lap joint width is not less than 12cm, preferably 15cm, the overlapped HDPE geomembrane is welded by a double-seam hot melting method preferentially, of course, other welding methods can be adopted in the implementation process, and a suitable welding method can be selected by a person skilled in the art according to specific conditions in the implementation process for welding.
The upper protective layer 5 is non-woven geotextile, and the specification of the non-woven geotextile is not less than 600g/m2Preferably 600g/m2(ii) a The upper protection layer 5 and the compacted clay layer 3 are used for realizing the upper and lower protection of the composite impermeable layer 4.
The grain diameter of the fine sand in the fine sand cushion layer 6 is 0.25-0.35 mm, preferably 0.25mm, and the thickness of the fine sand cushion layer 6 is not less than 20cm, preferably 30 cm. According to the invention, through the structural gaps among the fine sands in the fine sand cushion layer 6, the water retention of the upper layer can be reduced, and the structure is prevented from being soaked by liquid.
As shown in fig. 3, the present invention provides a method for constructing the impermeable structure shown in fig. 1, including:
s11, compacting the existing site foundation layer to form a smooth compacted foundation layer 1;
s12, paving clay on the leveling and compacting base layer 1 and compacting to form a compacted clay layer 3;
s13, sequentially paving a GC L pad 401 and a HDPE geomembrane 402 on the compacted clay layer 3 to form a composite impermeable layer 4;
s14, anchoring the composite impermeable layer 4; wherein the anchoring point is not less than 30cm higher than the leveling and compacting base layer 1;
s15, laying a protective layer 5 on the composite impermeable layer 4;
and S16, paving fine sand on the upper protective layer 5 to form a fine sand cushion 6.
And S17, leveling the surface of the fine sand cushion layer 6 to meet the requirement of the levelness of the structure.
The anti-seepage structure and the construction method are mainly applied to construction of medical and other emergency sites, the structure and the construction method of the anti-seepage structure are wide in material sources, simple in construction, easy to control quality and strong in operability, the anti-seepage construction of the site can be completed in a short time, the ground pollution is effectively prevented, and time is won for construction of upper-layer structures.
Example 2:
as shown in figure 1, the invention provides an anti-seepage structure for emergency site construction, which comprises a smooth and compacted base layer 1, a geogrid layer 2, a compacted clay layer 3, a composite anti-seepage layer 4, an upper protective layer 5 and a fine sand cushion layer 6 which are sequentially arranged from bottom to top, wherein the composite anti-seepage layer 4 comprises a GC L cushion (bentonite waterproof cushion) 401 and a HDPE geomembrane (high-density polyethylene geomembrane) 402 which are sequentially arranged from bottom to top.
On the basis of the anti-seepage structure, each layer of the structure is specifically designed as follows:
the specific design of the leveling and compacting base layer 1, the compacting clay layer 3, the composite impermeable layer 4, the upper protective layer 5 and the fine sand cushion layer 6 is the same as that of the embodiment 1;
the geogrid layer 2 is a biaxial tension plastic geogrid, and the specification of the biaxial tension plastic geogrid is that the nominal tensile strength per linear meter is not less than 20kN/m, and is preferably 35 kN/m. The geogrid layer 2 plays a role in reinforcing a foundation and controlling uneven settlement, and can increase the stability of an upper impermeable layer and a structure.
As shown in fig. 4, the present invention provides a method for constructing the impermeable structure shown in fig. 2, including:
s21, compacting the existing site foundation layer to form a smooth compacted foundation layer 1;
s22, laying geogrids on the leveling and compacting base layer 1 to form a geogrid layer 2;
s23, paving clay on the geogrid layer 2 and compacting to form a compacted clay layer 3;
s24, sequentially paving a GC L pad 401 and a HDPE geomembrane 402 on the compacted clay layer 3 to form a composite impermeable layer 4;
s25, anchoring the composite impermeable layer 4; wherein the anchoring point is not less than 30cm higher than the leveling and compacting base layer 1;
s26, laying a protective layer 5 on the composite impermeable layer 4;
and S27, paving fine sand on the upper protective layer 5 to form a fine sand cushion 6.
And S28, leveling the surface of the fine sand cushion layer 6 to meet the requirement of the levelness of the structure.
The anti-seepage structure and the construction method are mainly applied to construction of medical and other emergency sites, the structure and the construction method of the anti-seepage structure are wide in material sources, simple in construction, easy to control quality and strong in operability, the anti-seepage construction of the site can be completed in a short time, the ground pollution is effectively prevented, and time is won for construction of upper-layer structures.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An anti-seepage structure for construction of emergency sites, comprising:
the device comprises a leveling and compacting base layer, a compacting clay layer, a composite impermeable layer, an upper protective layer and a fine sand cushion layer which are arranged from bottom to top in sequence;
the composite impermeable layer comprises a GC L pad and a HDPE geomembrane which are sequentially arranged from bottom to top.
2. The barrier structure of claim 1, wherein a geogrid layer is disposed between the flattened compacted base layer and the compacted clay layer;
the geogrid layer is a biaxial stretching plastic geogrid, and the tensile strength of the biaxial stretching plastic geogrid per linear meter is not less than 20kN/m in nominal.
3. The barrier structure of claim 1, wherein the smooth compacted base layer has a degree of compaction of not less than 90%;
the thickness of the compacted clay layer is not less than 30cm, the degree of compaction is not less than 90%, and the permeability coefficient is not more than 1 × 10-5cm/s, and the longitudinal and transverse gradients of the compacted clay layer are 2-4%.
4. The barrier structure of claim 1, wherein the GC L pad is attached to an HDPE geomembrane and the GC L pad has a gauge of not less than 4800g/m2And the thickness of the HDPE geomembrane is 1.5-2.0 mm.
5. The barrier structure of claim 1, wherein the upper protective layer is a nonwoven geotextile, and the nonwoven geotextile has a gauge of not less than 600g/m2。
6. The seepage-proofing structure of claim 1, wherein the fine sand in the fine sand cushion layer has a particle size of 0.25-0.35 mm, and the thickness of the fine sand cushion layer is not less than 20 cm.
7. A method for constructing an impermeable structure according to any one of claims 1 to 6, comprising:
compacting the existing site foundation layer to form a smooth compacted foundation layer;
paving clay on the leveling and compacting base layer and compacting to form a compacted clay layer;
sequentially laying a GC L pad and a HDPE geomembrane on the compacted clay layer to form a composite impermeable layer;
laying an upper protective layer on the composite impermeable layer;
and paving fine sand on the upper protective layer to form a fine sand cushion layer.
8. The method of constructing as claimed in claim 7, further comprising:
laying a geogrid on the leveling and compacting base layer to form a geogrid layer;
and paving clay on the geogrid layer and compacting to form a compacted clay layer.
9. The construction method according to claim 7, wherein the GC L pad is laid in an overlapping manner, the overlapping width is not less than 30cm, bentonite particles are spread in an overlapping area, and the dosage of the bentonite particles is not less than 0.5kg/m2；
The HDPE geomembrane is laid in a lap joint mode, the lap joint width is not less than 120mm, and the lap joint area is welded by a double-seam hot melting method.
10. The method of constructing as claimed in claim 7, further comprising:
anchoring the composite impermeable layer; wherein the anchor point is not less than 30cm higher than the leveling and compacting base layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010375638.9A CN111395409A (en) | 2020-05-07 | 2020-05-07 | Seepage-proofing structure for emergency site construction and construction method of seepage-proofing structure |
| PCT/CN2020/118075 WO2021223358A1 (en) | 2020-05-07 | 2020-09-27 | Seepage-proof structure for use in emergency site construction and construction method for seepage-proof structure |
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| CN202010375638.9A CN111395409A (en) | 2020-05-07 | 2020-05-07 | Seepage-proofing structure for emergency site construction and construction method of seepage-proofing structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021223358A1 (en) * | 2020-05-07 | 2021-11-11 | 北京高能时代环境技术股份有限公司 | Seepage-proof structure for use in emergency site construction and construction method for seepage-proof structure |
| CN114370028A (en) * | 2021-11-18 | 2022-04-19 | 银川中铁水务集团有限公司 | Method for laying geomembrane on gravel soil substrate |
| CN114525818A (en) * | 2022-02-11 | 2022-05-24 | 中钢集团马鞍山矿山研究总院股份有限公司 | Construction method of combined anti-seepage body with horizontal anti-seepage function and vertical anti-seepage function |
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| US5846024A (en) * | 1997-01-03 | 1998-12-08 | Mao; James | Landfill system and method for constructing a landfill system |
| US5961437A (en) * | 1997-09-08 | 1999-10-05 | Lockheed Martin Idaho Technologies Company | Multi-layer waste containment barrier |
| CN201512779U (en) * | 2009-10-22 | 2010-06-23 | 北京高能时代环境技术股份有限公司 | Seepage control structure used in red mud disposal sites |
| CN201554043U (en) * | 2009-12-14 | 2010-08-18 | 苏州市环境卫生管理处 | Middle anti-seepage liner structure for preventing local sinking in refuse landfill |
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| CN111395409A (en) * | 2020-05-07 | 2020-07-10 | 北京高能时代环境技术股份有限公司 | Seepage-proofing structure for emergency site construction and construction method of seepage-proofing structure |
| CN212294766U (en) * | 2020-05-07 | 2021-01-05 | 北京高能时代环境技术股份有限公司 | A seepage prevention structure for construction of emergent place |
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2020
- 2020-05-07 CN CN202010375638.9A patent/CN111395409A/en active Pending
- 2020-09-27 WO PCT/CN2020/118075 patent/WO2021223358A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021223358A1 (en) * | 2020-05-07 | 2021-11-11 | 北京高能时代环境技术股份有限公司 | Seepage-proof structure for use in emergency site construction and construction method for seepage-proof structure |
| CN114370028A (en) * | 2021-11-18 | 2022-04-19 | 银川中铁水务集团有限公司 | Method for laying geomembrane on gravel soil substrate |
| CN114370028B (en) * | 2021-11-18 | 2024-03-12 | 银川中铁水务集团有限公司 | Laying method of geomembrane on gravel soil substrate |
| CN114525818A (en) * | 2022-02-11 | 2022-05-24 | 中钢集团马鞍山矿山研究总院股份有限公司 | Construction method of combined anti-seepage body with horizontal anti-seepage function and vertical anti-seepage function |
| CN114525818B (en) * | 2022-02-11 | 2023-07-28 | 中钢集团马鞍山矿山研究总院股份有限公司 | Construction method of combined impermeable body with horizontal impermeable and vertical impermeable functions |
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