CN211849628U - Self-healing horizontal barrier structure - Google Patents
Self-healing horizontal barrier structure Download PDFInfo
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- CN211849628U CN211849628U CN202020098341.8U CN202020098341U CN211849628U CN 211849628 U CN211849628 U CN 211849628U CN 202020098341 U CN202020098341 U CN 202020098341U CN 211849628 U CN211849628 U CN 211849628U
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Abstract
The utility model relates to a horizontal separation structure of self-healing type for the pollution risk management and control in industry pollution place, it includes from bottom to top in proper order and covers compaction soil bed course, under protective layer, artifical membrane barrier layer, liquid spraying rete, epimembranal protective layer, clean soil layer on polluting the place. The utility model provides a separation structure has the multilayer protection, blocks pollution upwards diffusion, and the separation is effectual. The liquid spraying film layer added with the root-resisting agent is applied, so that the barrier structure can resist root puncture and has self-healing property, the surface layer of the structure can automatically recover to be in a closed state after being punctured by external force, damage and leak are reduced, and barrier failure is avoided.
Description
Technical Field
The utility model relates to an environmental protection technology field, concretely relates to horizontal separation structure of self-healing type.
Background
Due to the change and adjustment of industrial structure and urban layout, a batch of moved and closed industrial enterprises are produced in recent years, and according to relevant laws and regulations, if the original site of the industrial site is polluted, the polluted site needs to be treated before the use property of the original soil is changed and secondary development and utilization are carried out. In the past, source treatment techniques have been generally used to remediate these industrial contaminated plots. However, for some heavily polluted plots, a small amount of pollutants still remain after source treatment measures, and other plots have large buried depth and low pollution concentration, are not exposed to the periphery, do not need to be treated by chemical or physical methods, can adopt risk control measures to block pollution paths, and achieve the purpose of pollution treatment.
The barrier technology comprises horizontal barrier and vertical barrier, the horizontal barrier technology is adopted in few cases in China at the present stage, and materials such as impermeable concrete, clay, GCL, HDPE films and the like are generally adopted to form a horizontal barrier structure singly or in combination. When the rigid materials such as concrete are adopted, the deformation resistance is low, stress is easy to generate, cracks are easy to appear, and the later development and construction can be influenced. When flexible materials such as clay and HDPE films are adopted, due to small hardness, the built pollution blocking structure is very easy to be penetrated by vegetation roots and foreign matters to generate damaged parts, and pollution diffusion risks can be brought if the pollution blocking structure is not found to be repaired in time, so that a receptor is damaged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a horizontal separation structure of self-healing type makes it can be resistant root puncture and have self-healing nature, receives external force and punctures the back structure top layer and can automatic recovery airtight state, reduces damage, leak, avoids the separation inefficacy.
In order to achieve the above object, the utility model adopts the following technical scheme:
a self-healing horizontal barrier structure is characterized by comprising a compacted soil cushion layer, a lower protective layer, an artificial membrane impermeable layer, a liquid spraying film layer and an upper protective layer which are sequentially covered on a polluted site from bottom to top; the protective layer is non-woven geotechnical cloth under the membrane and on the membrane, the barrier layer of artifical membrane is high density polyethylene membrane, liquid spraying rete spraying in the surface of barrier layer of artifical membrane.
The self-healing horizontal barrier structure, wherein: and compacting the surface of the polluted site to form a compacted polluted soil base layer, wherein the flatness of the compacted polluted soil base layer is less than 2cm per cubic meter.
The self-healing horizontal barrier structure, wherein: the compacted soil cushion layer is made of compacted natural clay, the thickness is 75-91.4cm, the compaction coefficient is 0.9, and the flatness is less than 2cm per square meter.
The self-healing horizontal barrier structure, wherein: the lower protective layer and the upper protective layer are respectively formed by a plurality of non-woven geotextiles through hot bonding, and the specification is not less than 600g/m2Of joined non-woven geotextilesThe width of the lap joint between the two is 200 plus or minus 20 mm.
The self-healing horizontal barrier structure, wherein: the anti-seepage layer of the artificial membrane is formed by hot-melting and connecting a plurality of high-density polyethylene membranes, the lap joint width between the connected high-density polyethylene membranes is 100 +/-20 mm, the breadth is more than 6.5m, the thickness is 1.5mm-2.0mm, and the permeability coefficient is less than 10-7m/s。
The self-healing horizontal barrier structure, wherein: and a clean soil layer with the thickness of not less than 45cm is laid on the upper protective layer of the film.
The self-healing horizontal barrier structure, wherein: the edge of the lower protective layer, the edge of the artificial membrane impermeable layer, the edge of the liquid spraying membrane layer and the edge of the upper protective layer of the membrane are fixed on the vertical face of the vertical separation wall through bolts, and a part of the membrane is reserved and reversely wrapped on the bolts and fixedly connected with the membrane on the vertical face through extrusion welding.
The self-healing horizontal barrier structure, wherein: the edges of the lower protective layer, the artificial membrane impermeable layer, the liquid spraying film layer and the upper protective layer of the membrane are downwards embedded into the anchoring ditch and filled with soil and tamped, and the upper part of the soil filling area is covered with a protection block.
The utility model has the advantages of as follows: the multilayer protective measures are adopted, the liquid spraying film layer added with the root-resisting agent component is applied, the structure can resist root puncture, the self-healing performance is realized, the surface layer can be restored to a closed state after being punctured by external force, the damage and the leak are reduced, and the barrier failure caused by external environment disturbance is avoided. Moreover, the utility model discloses the construction is simple, can accomplish the construction of separation system in the short time to can realize good separation effect to the pollution.
Drawings
Fig. 1 is the utility model discloses a self-healing type horizontal separation structure section sketch map.
Fig. 2 is the structural schematic diagram of the seamless connection between the middle horizontal separation structure film layer and the vertical separation structure through the bolt.
Fig. 3 is a schematic structural view of the middle horizontal barrier structure film layer of the present invention fixed by rammed earth in the anchoring ditch.
Reference numerals: compacting the base layer 1; compacting the soil cushion layer 2; a lower protective layer 3; an artificial membrane impermeable layer 4; liquid spraying the film layer 5; an on-film protective layer 6; cleaning the soil layer 7; vertical barrier walls 8; an expansion bolt 9; performing extrusion welding 10; an anchoring trench 11; an anchoring groove break 12; filling soil 13; and a revetment 14.
Detailed Description
As shown in fig. 1, the utility model provides a self-healing horizontal barrier structure, which comprises a compacted soil cushion layer 2 covering a polluted site from bottom to top, a lower protective layer 3, an artificial membrane impermeable layer 4, a liquid spraying film layer 5, an upper protective layer 6 and a clean soil layer 7;
compacting the surface of the polluted site to form a compacted polluted soil base layer 1, wherein the flatness of the compacted polluted soil base layer 1 is less than 2cm per cubic meter;
the compacted soil cushion layer 2 is made of compacted natural clay, the thickness is 75-91.4cm, the compaction coefficient is 0.9, and the flatness is less than 2cm per square meter; the compacted soil mat layer 2 serves as a first pollution barrier layer to prevent pollutants from migrating upwards;
the lower protective layer 3 is formed by thermally bonding and connecting a plurality of pieces of non-woven geotextile, has the characteristics of ageing resistance and corrosion resistance, plays a role in protecting the artificial membrane impermeable layer 4, and has the specification of not less than 600g/m2The lap width between the connected non-woven geotextiles is 200 plus or minus 20 mm; the edge of the lower protective layer 3 is in seamless connection or fixed connection with the vertical separation structure, preferably, the edge can be in fixed connection with the vertical separation wall through bolts or rammed earth through anchoring ditches;
the artificial membrane impermeable layer 4 is formed by hot-melting and connecting a plurality of high-density polyethylene films (HDPE films), the lap width between the connected high-density polyethylene films is 100 +/-20 mm, the width needs to be larger than 6.5m for reducing the number of seams, the thickness is 1.5mm-2.0mm, and the permeability coefficient is less than 10-7m/s; the edge of the artificial membrane impermeable layer 4 is in seamless connection or fixed connection with the vertical separation structure, preferably, the artificial membrane impermeable layer can be connected with the vertical separation wall through bolts or fixed through rammed earth of an anchoring ditch; the artificial membrane impermeable layer 4 is used as a second pollution barrier layer to prevent pollutants from migrating upwards;
the liquid spraying film layer 5 adopts a bi-component root-resistant rubber asphalt spraying material as a third pollution blocking layer, so that the pollution blocking effect is enhanced, and a surface layer structure with root resistance and self-healing performance is formed;
the bi-component root-resistant rubber asphalt spraying material is formed by a component A and a component B in a proportioning ratio, wherein the component A comprises the following components in parts by weight: 10-90 parts of emulsified asphalt, 10-90 parts of water-based latex, 5-50 parts of water-based tackifying resin, 10-50 parts of polar latex and 0.1-15 parts of root-resisting agent; the component B is a solution formed by dissolving a mixture in water, wherein the mixture comprises the following components in percentage by mass: 92-99.9% of calcium chloride and 0.1-8% of composite aluminum-iron polymer, wherein the admixture accounts for 1-20% of the weight of the solution; the mass ratio of the component A to the component B is 5-10: 1;
the liquid spraying film layer 5 is sprayed by high-pressure spraying equipment, and the component A and the component B are mixed in the air and separated out water to form a film to form the liquid spraying film layer 5; during spraying operation, the spray gun is perpendicular to the spraying base layer, and is sprayed for multiple times once until the thickness is 1.5-3mm, and the spraying is required to be uniform without generating gaps; brushing and scraping for reinforcement are needed when the construction is carried out on the part which is easy to be damaged;
the membrane upper protective layer 6 is formed by thermally bonding and connecting a plurality of non-woven geotextiles, the lap joint width of the connected non-woven geotextiles is 200 +/-20 mm, the membrane upper protective layer has the characteristics of ageing resistance and corrosion resistance, protects the artificial membrane impermeable layer 4 and the liquid spraying membrane layer 5, and has the specification of not less than 600g/m2(ii) a The edge of the protective layer 6 on the film is in seamless connection or fixed connection with the vertical separation structure, preferably, the edge can be connected with the vertical separation wall through bolts or fixed through rammed earth of an anchoring ditch;
the thickness of the covering soil of the clean soil layer 7 can be determined by combining with a field future planning scheme according to related requirements, and the minimum thickness is not less than 45 cm.
After the barrier structure is built, barrier engineering performance detection is required, and later-period environment supervision including long-term environment monitoring and system control is carried out on the land parcel.
The steps of connecting the film layers to the vertical barrier structure through the bolts are as follows, as shown in fig. 2:
1) fixing the film on the vertical surface of the vertical barrier wall 8 by using expansion bolts 9, and reserving a part of film;
2) and reversely wrapping the reserved film on the expansion bolt 9 and performing extrusion welding 10 on the reserved film and the extending part on the vertical surface to achieve the fixing and seepage-proofing effects.
The steps of ramming the soil in the film layers by using the anchoring ditches are as follows, as shown in fig. 3:
1) engineering measures are adopted to dig out the anchoring ditch 11, and the anchoring ditch 11 is made into an arc-shaped structure at the downward turning part 12;
2) tamping and fixing the edges of the membrane in the anchoring ditch 11 by filling soil 13;
3) the upper part of the region of the fill 13 is covered with a revetment 14.
Correspondingly, the utility model provides a pollution separation method based on prevention of seepage system founds, including following step:
(1) and (5) measuring and paying off, and determining the pollution range.
(2) And flattening and compacting the polluted soil foundation layer 1.
(3) And paving a compacted soil cushion layer 2 on the polluted soil foundation layer 1.
(4) And laying a lower protective layer 3 on the compacted soil cushion layer 2.
(5) An artificial membrane impermeable layer 4 is laid on the lower protective layer 3.
(6) And spraying a liquid film on the artificial film impermeable layer 4.
(7) And after the liquid spraying film layer 5 is solidified, an upper film protective layer 6 is laid.
(8) A clean soil layer 7 is laid on the membrane upper protective layer 6.
Therefore, the utility model has the advantages of as follows: adopt multilayer safeguard measure and applied the liquid spraying rete 5 that adds root-blocking agent composition, make the structure can be able to bear the root puncture, and have self-healing, receive external force to puncture the back top layer and can resume airtight state, reduce damage, leak, avoid receiving external environment disturbance to cause the separation inefficacy. Moreover, the utility model discloses the construction is simple, can accomplish the construction of separation system in the short time to can realize good separation effect to the pollution.
The construction method of the present invention will be described below with reference to several examples.
First embodiment
And (5) measuring and paying off, and determining the pollution range.
And (4) flattening the compacted polluted site, wherein the error of the flatness of the compacted base layer per cubic meter is 2cm at most.
And paving a compacted soil cushion layer 2 on the compacted base layer, namely, flattening and compacting the clay layer, wherein the compaction coefficient is 0.9, the thickness is 75cm, and the error of flatness per square meter is 2cm at most.
A lower protective layer 3 is laid on the compacted soil cushion layer 2, the lower protective layer 3 adopts non-woven geotextile with the specification of 600g/m2And each frame is connected by thermal bonding, and the lap joint width is 200 mm.
An artificial membrane impermeable layer 4 is laid on the lower protective layer 3, the artificial membrane impermeable layer 4 is made of a high-density polyethylene membrane, the thickness is 1.5mm, the width is 6.5m, and the permeability coefficient of the artificial membrane impermeable layer 4 is less than 10-7m/s, and the width of the lap joint is 100 mm.
The liquid spraying film layer 5 is sprayed by high-pressure spraying equipment, the component A and the component B are intersected and mixed in the air, and water is separated out to form a film, so that the liquid spraying film layer 5 is formed. During spraying operation, the spray gun is perpendicular to the spraying base layer, the spraying is carried out for multiple times once until the thickness is 2mm, the spraying is uniform, and no gap is generated. When the construction is carried out on the part which is easy to be damaged, brushing and blade coating are carried out for reinforcement. The mass ratio of the component A to the component B is 5:1, wherein the component A is prepared from the following raw materials in parts by weight; 50 parts of anionic emulsified asphalt, 15 parts of anionic aqueous carboxyl neoprene latex, 15 parts of anionic aqueous polyterpene resin, 10 parts of anionic aqueous carboxyl polyterpene latex and 1 part of root-resisting agent. The component B is a solution formed by dissolving a blend in water, wherein the blend comprises 99% of calcium chloride and 1% of composite aluminum-iron polymer by mass percent, and the blend accounts for 10% of the weight of the solution.
Laying an upper protective layer 6 of the membrane after the liquid spraying membrane layer 5 is solidified, wherein the upper protective layer 6 of the membrane adopts non-woven geotextile with the specification of 600g/m2And each frame is connected by thermal bonding, and the lap joint width is 200 mm.
The film structure edges of the lower protective layer 3, the artificial film impermeable layer 4, the liquid spraying film layer 5 and the upper protective layer 6 are connected with the vertical separation wall 8 (cement-bentonite separation wall) through bolts and welded points.
And laying a clean soil layer 7 with the thickness of 45 cm.
Second embodiment
And (5) measuring and paying off, and determining the pollution range.
And (4) flattening the compacted polluted site, wherein the error of the flatness of the compacted base layer per cubic meter is maximally 1cm after compaction.
And paving a compacted soil cushion layer 2 on the compacted base layer, flattening and compacting the clay layer, wherein the compaction coefficient is 0.9, the thickness is 90cm, and the maximum error of flatness per square meter is 1 cm.
A lower protective layer 3 is laid on the compacted soil cushion layer 2, the lower protective layer 3 adopts non-woven geotextile with the specification of 650g/m2And each frame is connected by thermal bonding, and the lap joint width is 210 mm.
An artificial membrane impermeable layer 4 is laid on the lower protective layer 3, the artificial membrane impermeable layer 4 is made of a high-density polyethylene membrane, the thickness is 2mm, the width is 8m, and the permeability coefficient is less than 10-7m/s, and the width of the lap joint is 100 mm.
The liquid spraying film layer 5 is sprayed by high-pressure spraying equipment, the component A and the component B are intersected and mixed in the air, and water is separated out to form a film, so that the liquid spraying film layer 5 is formed. During spraying operation, the spray gun is perpendicular to the spraying base layer, the spraying is carried out for multiple times once until the thickness is 3mm, the spraying is required to be uniform, and no gap is generated. When the construction is carried out on the part which is easy to be damaged, brushing and blade coating are carried out for reinforcement. The mass ratio of the component A to the component B is 5:1, wherein the component A is prepared from the following raw materials in parts by weight; 10 parts of anionic emulsified asphalt, 10 parts of anionic aqueous carboxyl neoprene latex, 20 parts of anionic aqueous polyterpene resin, 45 parts of anionic aqueous carboxyl polyterpene latex and 1 part of root-resisting agent. The component B comprises 99 percent of calcium chloride and 1 percent of composite aluminum-iron polymer by mass percent, and is dissolved in water to prepare the calcium chloride with the weight concentration of 10 percent.
Laying an upper protective layer 6 of the membrane after the liquid spraying membrane layer 5 is solidified, wherein the upper protective layer 6 of the membrane adopts non-woven geotextile with the specification of 600g/m2And each frame is connected by thermal bonding, and the lap joint width is 210 mm.
The film structure edges of the lower protective layer 3, the artificial film impermeable layer 4, the liquid spraying film layer 5 and the upper protective layer 6 are tamped and fixed by filling soil in the anchoring ditch and covered by the protection brick, and the turning part of the anchoring ditch is made into an arc-shaped structure.
And laying a clean soil layer 7 with the thickness of 100 cm.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A self-healing horizontal barrier structure is characterized by comprising a compacted soil cushion layer, a lower protective layer, an artificial membrane impermeable layer, a liquid spraying film layer and an upper protective layer which are sequentially covered on a polluted site from bottom to top; the protective layer is non-woven geotechnical cloth under the membrane and on the membrane, the barrier layer of artifical membrane is high density polyethylene membrane, liquid spraying rete spraying in the surface of barrier layer of artifical membrane.
2. A self-healing horizontal barrier structure according to claim 1, wherein: and compacting the surface of the polluted site to form a compacted polluted soil base layer, wherein the flatness of the compacted polluted soil base layer is less than 2cm per cubic meter.
3. A self-healing horizontal barrier structure according to claim 1, wherein: the compacted soil cushion layer is made of compacted natural clay, the thickness is 75-91.4cm, the compaction coefficient is 0.9, and the flatness is less than 2cm per square meter.
4. A self-healing horizontal barrier structure according to claim 1, wherein: the lower protective layer and the upper protective layer are respectively formed by a plurality of non-woven geotextiles through hot bonding, and the specification is not less than 600g/m2Is connected toThe overlap width between the non-woven geotextiles of (1) is 200 +/-20 mm.
5. A self-healing horizontal barrier structure according to claim 1, wherein: the anti-seepage layer of the artificial membrane is formed by hot-melting and connecting a plurality of high-density polyethylene membranes, the lap joint width between the connected high-density polyethylene membranes is 100 +/-20 mm, the breadth is more than 6.5m, the thickness is 1.5mm-2.0mm, and the permeability coefficient is less than 10-7m/s。
6. A self-healing horizontal barrier structure according to claim 1, wherein: and a clean soil layer with the thickness of not less than 45cm is laid on the upper protective layer of the film.
7. A self-healing horizontal barrier structure according to claim 1, wherein: the edge of the lower protective layer, the edge of the artificial membrane impermeable layer, the edge of the liquid spraying membrane layer and the edge of the upper protective layer of the membrane are fixed on the vertical face of the vertical separation wall through bolts, and a part of the membrane is reserved and reversely wrapped on the bolts and fixedly connected with the membrane on the vertical face through extrusion welding.
8. A self-healing horizontal barrier structure according to claim 1, wherein: the edges of the lower protective layer, the artificial membrane impermeable layer, the liquid spraying film layer and the upper protective layer of the membrane are downwards embedded into the anchoring ditch and filled with soil and tamped, and the upper part of the soil filling area is covered with a protection block.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139873A (en) * | 2020-01-16 | 2020-05-12 | 中科鼎实环境工程有限公司 | Self-healing horizontal barrier structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139873A (en) * | 2020-01-16 | 2020-05-12 | 中科鼎实环境工程有限公司 | Self-healing horizontal barrier structure |
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