CN114733890A - A groundwater restoration and monitoring channel structure in a landfill area - Google Patents

Abstract

The invention provides a groundwater remediation and monitoring channel structure in a landfill area, which comprises a well pipe and a plurality of impermeable layers, wherein a filter layer is arranged at the bottom end opening of the well pipe, and the impermeable layers are sleeved on the well pipe. The underground water repairing and monitoring channel structure can be combined with each layer of soil structure after repairing through the impermeable layer to form an embedded structure, so that the soil of each layer is prevented from leaking along with the well pipe structure, and the channel structure for underground water repairing is effectively reserved while the soil structure is not influenced.

Description

A groundwater restoration and monitoring channel structure in a landfill area

technical field

The invention relates to a repairing channel structure, in particular to a groundwater repairing and monitoring channel structure in a landfill area.

Background technique

At present, many contaminated soil remediation projects in China usually carry out in-situ isolation and backfilling of the soil after the remediation and treatment standards have been met. For complex sites with complex soil and groundwater pollution, the groundwater remediation platform has a long period of time, and the effect is slow in the later period, and long-term monitoring is required. In order to achieve simultaneous water and soil treatment and long-term monitoring of groundwater at the bottom of the site, the overlap between the anti-seepage layer and the groundwater well is an engineering difficulty. Improper operation is often easy to cause damage to the soil barrier and landfill anti-seepage layer, causing the groundwater to meet the remediation standards. Secondary pollution of soil.

For the comprehensive treatment of contaminated soil landfill barrier and groundwater remediation, in order to ensure that the landfill barrier process and the groundwater remediation process are carried out simultaneously, or to implement the landfill barrier first and then perform groundwater in-situ remediation, it is necessary to build groundwater remediation in the landfill area of the site. In addition to monitoring the channel structure, while reserving injection wells, extraction wells or monitoring wells for groundwater restoration, the integrity of the landfill barrier and seepage prevention system is guaranteed.

SUMMARY OF THE INVENTION

The invention provides a groundwater restoration and monitoring channel structure in a landfill area, which can prevent leakage while reserving groundwater restoration wells.

The invention provides a groundwater repair and monitoring channel structure in a landfill area. The groundwater repair and monitoring channel structure includes a well pipe and several anti-seepage layers. The bottom port of the well pipe is provided with a filter layer. The seepage layer is sleeved on the well pipe.

Further, the well pipe further includes a plurality of reinforcement structures, and the anti-seepage layer is fixedly connected to the well pipe through the reinforcement structures.

Further, the reinforcing structure is a tube shoe structure.

Further, the well pipe, the pipe shoe structure and the anti-seepage layer are made of HDPE material.

Further, the outside of the well pipe is also covered with a non-woven geotextile layer.

Further, the filter layer is a non-woven geotextile layer.

Further, the groundwater restoration and monitoring channel structure further includes a plurality of counterweights, and the counterweights are installed on the well pipe at intervals.

Further, the groundwater restoration and monitoring channel structure further includes an anti-seepage sleeve, the diameter of the anti-seepage sleeve is larger than the diameter of the well pipe, and the anti-seepage sleeve is sleeved at the top of the well pipe, and The anti-seepage sleeve is spaced from the well pipe.

Furthermore, an anti-seepage layer is provided outside the anti-seepage sleeve, and the anti-seepage layer is fixedly connected with the anti-seepage sleeve.

Further, the groundwater restoration and monitoring channel structure further includes a protective casing, the protective casing is connected to the anti-seepage sleeve, and the protective casing is wholly or partially located above the anti-seepage casing.

Compared with the prior art, in the present invention, the anti-seepage layer is provided, so that the well pipe can be combined with each layer of the restored soil structure to form an embedded structure, so as to avoid the leakage of each layer of soil along with the well pipe structure. Under the condition of damage to the bottom of the landfill and the structure of the anti-seepage layer of the closed site, the groundwater restoration channel is reserved to realize the later restoration and management of groundwater and long-term monitoring, which can greatly shorten the project construction period and ensure the integrity of the landfill barrier system. At the same time, the groundwater restoration and monitoring channel structure of the present invention can also be used as a sampling channel after the landfill is completed to realize long-term monitoring of solid waste in the landfill area. If the soil at the sampling point exceeds the standard, it can also be used as an in-situ restoration. The channel for injecting medicine serves multiple purposes.

Description of drawings

1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the connection between the well pipe and the reinforcement structure according to the embodiment of the present invention.

1. Well pipe; 11. Strengthening structure; 2. Anti-seepage layer; 3. Filter layer; 4. Counterweight; 5. Anti-seepage sleeve; 6. Protective casing.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the present invention discloses a groundwater restoration and monitoring channel structure in a landfill area. The groundwater restoration and monitoring channel structure includes a well pipe 1 and several anti-seepage layers 2. The bottom port of the well pipe 1 is provided with a filter Layer 3, the anti-seepage layer 2 is sleeved on the well pipe 1.

The diameter of the well pipe 1 is from DN160 to DN200. The structure of each soil layer in the environment where the embodiment of the present invention is located is shown in Figure 1. After the pipe 1 penetrates the groundwater drainage layer, it is buried in the tamped base layer (compact degree 0.93), and the buried depth is ≥500mm, and the channel of the well pipe 1 is kept fixed and vertical. An anti-seepage layer 2 is arranged in the bottom anti-seepage structure layer, and the well pipe 1 passes through the anti-seepage layer 2 and is connected with the anti-seepage layer 2 in a sealed manner. After the top of the well pipe 1 protrudes from the ground by 200mm to 300mm, a pipe plug is installed at the top of the well pipe 1.

In the embodiment of the present invention, the anti-seepage layer 2 is provided, so that the well pipe 1 can be combined with the structure of the restored soil layers to form an embedded structure, so as to avoid the leakage of each layer of soil along with the structure of the well pipe 1, without damaging the filling Under the condition of the structure of the bottom of the landfill and the anti-seepage layer 2, the groundwater restoration channel is reserved to realize the post-remediation treatment and long-term monitoring of the groundwater, which can greatly shorten the construction period of the project and ensure the integrity of the landfill barrier system. At the same time, the groundwater restoration and monitoring channel structure of the present invention can also be used as a sampling channel after the landfill is completed to realize long-term monitoring of solid waste in the landfill area. If the soil at the sampling point exceeds the standard, it can also be used as an in-situ restoration. The channel for drug injection serves multiple purposes. In addition, in the embodiment of the present invention, the filter layer 3 is wrapped at the bottom of the well pipe 1, which can filter the inflowing water body and avoid the blockage of the well pipe 1 caused by inhalation of sediment and the like.

Optionally, the well pipe 1 further includes a plurality of reinforcement structures 11 , and the impermeable layer 2 is fixedly connected to the well pipe 1 through the reinforcement structures 11 .

Particularly, as shown in FIG. 2 , the reinforcing structure 11 is a tube shoe structure.

In particular, the well pipe 1, the pipe shoe structure and the anti-seepage layer 2 are made of HDPE material.

Among them, the tube boot structure consists of a tube sleeve and a tube skirt, both of which are welded by cutting HDPE diaphragms.

During construction, first put the tube boot on the outside of the well tube 1, use an extrusion welding machine to weld and fix the casing to the outer wall of the well tube 1, and then weld the tube skirt to the HDPE membrane impermeable layer 2 to form an integrated structure. After welding, an electric spark detector can be used for weld quality inspection.

By adopting the pipe shoe structure in the embodiment of the present invention, the exterior of the well pipe 1 can be mainly strengthened, so as to ensure that this part has strong anti-leakage performance and avoid groundwater pollution to the soil there.

Optionally, the outside of the well pipe 1 is also covered with a non-woven geotextile layer.

Among them, the non-woven geotextile was 600 g/m ² .

In the embodiment of the present invention, a non-woven geotextile layer is arranged outside the well pipe 1 to effectively protect the structure of the well pipe 1. At the same time, if the well pipe 1 leaks, the non-woven geotextile can effectively prevent the soil from falling into the well pipe 1. The cleanliness of the well pipe 1 is ensured to facilitate subsequent repair of the well pipe 1 .

Optionally, the filter layer 3 is a non-woven geotextile layer.

Optionally, the groundwater restoration and monitoring channel structure further includes a plurality of counterweights 4 , and the counterweights 4 are installed on the well pipe 1 at intervals.

Among them, as shown in FIG. 1 , in order to ensure that the passage of the well pipe 1 is vertical to the ground and is not easy to be tilted and overturned by lateral pressure during the landfill process, in the embodiment of the present invention, several counterweights 4 are provided, and adjacent counterweights 4 are provided. The interval between them is 3m-5m.

During construction, the well pipe 1 can be buried in layers. In the process of layered landfill, a set of counterweights 4 are set for every 3m-5m of the landfill. -300mm thick C20 concrete layer, height 500mm.

In the embodiment of the present invention, by arranging a plurality of counterweights 4, the well pipe 1 can be effectively fixed, vibration and shaking can be reduced, and force balance can be maintained.

Optionally, the groundwater restoration and monitoring channel structure further includes an anti-seepage sleeve 5, the diameter of the anti-seepage sleeve 5 is larger than the diameter of the well pipe 1, and the anti-seepage sleeve 5 is sleeved on the well. At the top of the pipe 1 , and the anti-seepage sleeve 5 is spaced from the well pipe 1 .

In particular, the anti-seepage sleeve 5 is provided with an anti-seepage layer 2 , and the anti-seepage layer 2 is fixedly connected with the anti-seepage sleeve 5 .

Among them, as shown in FIG. 1 , when long-term sampling and monitoring of the landfill is required, an anti-seepage sleeve 5 can be provided, and the anti-seepage sleeve 5 is an HDPE sleeve. The diameter of the anti-seepage sleeve 5 is DN1000, as shown in Figure 1. It is buried in the clay layer and planting soil layer of the anti-seepage structure layer of the closed site, and the buried depth is ≥1000mm, and is welded with the HDPE membrane anti-seepage layer 2. Because the anti-seepage sleeve There is a distance between the barrel 5 and the well pipe 1, so the anti-seepage sleeve 5 can be used as a sampling channel, which is convenient for the staff to sample the soil between the anti-seepage sleeve 5 and the well pipe 1 through the anti-seepage sleeve 5.

In particular, the groundwater restoration and monitoring channel structure further includes a protective sleeve 6 , the protective sleeve 6 is connected with the anti-seepage sleeve 5 , and the protective sleeve 6 is located above the anti-seepage sleeve 5 in whole or in part.

The protective sleeve 6 is made of steel. The protective casing 6 is buried in the ground to a depth of ≥200mm, and is fixed by pouring 100-200mm thick C20 concrete around the casing. - A protective cover plate is provided on the protective sleeve 6 and locked. - The diameter of the protective casing 6 is DN250-DN400; if the anti-seepage casing 5 is set outside the well pipe 1 channel as the sampling channel, the diameter of the steel protective casing 6 is DN1100-DN1200.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should After applying for the description, the specific embodiments of the present invention can still be modified or equivalently replaced, but these modifications or changes do not depart from the protection scope of the pending claims of the present invention.

Claims (10)

1. a groundwater restoration and monitoring channel structure in a landfill area, is characterized in that, described groundwater restoration and monitoring channel structure comprise well pipe, several anti-seepage layers, the bottom port of described well pipe is provided with filter layer, so The anti-seepage layer is sleeved on the well pipe. 2 . The groundwater restoration and monitoring channel structure in a landfill area according to claim 1 , wherein the well pipe further comprises a plurality of reinforcement structures, and the anti-seepage layer is fixedly connected to the well pipe through the reinforcement structures. 3 . 3 . The groundwater restoration and monitoring channel structure in a landfill area according to claim 2 , wherein the strengthening structure is a pipe shoe structure. 4 . 4 . The groundwater restoration and monitoring channel structure in a landfill area according to claim 3 , wherein the well pipe, the pipe shoe structure and the anti-seepage layer are made of HDPE material. 5 . 5 . The groundwater restoration and monitoring channel structure of claim 1 , wherein the outside of the well pipe is also covered with a non-woven geotextile layer. 6 . 6 . The groundwater restoration and monitoring channel structure in a landfill area according to claim 1 , wherein the filter layer is a non-woven geotextile layer. 7 . 7 . The groundwater restoration and monitoring channel structure according to claim 1 , wherein the groundwater restoration and monitoring channel structure further comprises a plurality of counterweights, and the counterweights are installed at intervals in the well. 8 . tube. 8 . The groundwater repair and monitoring channel structure according to claim 1 , wherein the groundwater repair and monitoring channel structure further comprises an anti-seepage sleeve, and the diameter of the anti-seepage sleeve is larger than the diameter of the the diameter of the well pipe, the anti-seepage sleeve is sleeved at the top of the well pipe, and the anti-seepage sleeve and the well pipe are spaced apart. 9 . The groundwater restoration and monitoring channel structure in a landfill area according to claim 8 , wherein an anti-seepage layer is provided outside the anti-seepage sleeve, and the anti-seepage layer is fixedly connected to the anti-seepage sleeve. 10 . . 10 . The groundwater restoration and monitoring channel structure in a landfill area according to claim 8 , wherein the groundwater restoration and monitoring channel structure further comprises a protective casing, and the protective casing is connected to the anti-seepage sleeve. 11 . , the protective sleeve is wholly or partially located above the anti-seepage sleeve.

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