CN209810895U - Horizontal drainage guide system of refuse landfill - Google Patents

Abstract

The utility model belongs to environment geotechnical engineering field especially relates to a horizontal drainage guide system of refuse landfill. Horizontal drainage guide system includes: a trench; the multilayer filling layers are sequentially laid in the ditch from bottom to top and are formed by piling up crushed stones and elastomers, and the mass ratio of the elastomers in the multilayer filling layers from bottom to top is sequentially reduced; and the drainage guide pipe is horizontally laid in the filling layer at the lowest layer. The utility model discloses can improve the life-span of calandria, improve the leachate drainage effect.

Description

Horizontal drainage system for landfill

technical field

The utility model belongs to the field of environmental geotechnical engineering, and in particular relates to a horizontal guide and drainage system of a garbage landfill and a construction method thereof.

Background technique

With the continuous increase of domestic waste production in my country, the processing load of landfills is also increasing year by year, which brings enormous pressure to the daily management and operation of landfills. Due to the fact that most of the waste landfills in my country have not implemented zonal landfill, coupled with the low operating efficiency of the bottom guide system of the waste landfill, and the long-term consolidation of the waste dump, the permeability of the waste dump is poor and other factors, resulting in landfill waste. The overall internal leachate level is high.

The above phenomenon directly leads to many unfavorable working conditions: (1) The pores for gas circulation in the pile are blocked, resulting in low efficiency of biogas flow into the gas well, and low biogas collection efficiency, which can easily cause methane leakage, which in turn leads to fires and explosions (2) The increase of pore saturation will directly lead to the decrease of the shear strength of the garbage dump, and the slope will easily cause landslide accidents; (3) The permeability of the garbage dump will decrease, and it is difficult to form a sufficient oxygen environment in the aerobic ventilation project , causing the aerobic restoration project to run slowly. Therefore, it is of great significance for the efficient operation of anaerobic and aerobic landfills to increase the drainage of leachate in landfills and minimize the water level of leachate.

Horizontal drainage wells are much better than vertical drainage wells in terms of leachate drainage effect, but the cost of building horizontal drainage wells is relatively high after the landfill project of garbage dumps is completed; when the landfill depth is large, due to Garbage dumps are prone to collapse, and it is difficult to carry out the construction of horizontal drainage wells. Therefore, the best construction period for horizontal drainage wells is pre-embedded when the garbage dumps are being filled.

In the process of realizing the utility model, the applicant finds that there are at least the following deficiencies in the prior art:

In the prior art, due to the uneven settlement of the landfill, the drainage pipes in the horizontal drainage wells are easily crushed by the upper garbage pile and are easily damaged. With the increase of the operating years of the landfill, the horizontal drainage The system mostly fails.

Utility model content

Aiming at the above-mentioned problems in the prior art, the utility model provides a horizontal drainage system for landfill and its construction method, so as to improve the drainage effect of leachate.

The utility model realizes above-mentioned purpose through following technical scheme:

On the one hand, the utility model discloses a horizontal guide system for landfills, the system includes:

ditch;

Multi-layer filling layer, the multi-layer filling layer is laid sequentially in the ditch from bottom to top, the filling layer is formed by stacking gravel and elastic body, and the elastic The mass ratio of the body decreases in turn;

The drainage pipe is laid horizontally in the bottommost filling layer.

Preferably, the elastomer in the filling layer is waste tire shreds.

Preferably, the elastomer in the filling layer is made of rubber, high-density polyethylene or a mixture of both.

Further, the filling layer is provided with two sides, including a first filling layer at the bottom and a second filling layer at the top, and a filter layer is arranged between the first filling layer and the second filling layer.

Further, the upper surface of the drain pipe is flush with the top of the first filling layer.

Further, in the first filling layer, the mass ratio of the elastomer to the gravel is 20%-35%, and the size of the elastomer is smaller than 3-4 times the maximum diameter of the gravel.

Further, in the second filling layer, the mass ratio of the elastomer to the crushed stone is 10%-15%, and the size of the elastic body is smaller than 2-3 times the maximum diameter of the crushed stone.

Preferably, the filter layer is a geotechnical filter, and both width ends of the geotechnical filter are anchored in the side walls of the ditch.

Further, geotextile is wrapped on the peripheral surface of the drainage pipe.

On the other hand, the utility model also provides a construction method of a horizontal drainage system in a landfill, the construction method comprising:

Digging ditches in the rubbish mass;

Laying part of the lowest fill layer at the bottom of the ditch to form the foundation for the construction;

Place the drainage pipe on the construction foundation, and continue to lay another part of the bottom filling layer on the construction foundation until the construction of the bottom filling layer is completed;

Lay the rest of the fill layer on top of the bottom fill layer in turn until the ditch is filled.

The beneficial effects of the utility model are:

In the horizontal drainage system of a landfill provided by the utility model, since the multi-layer filling layers are successively laid in the ditch from bottom to top, the drainage pipes are laid horizontally in the bottom filling layer, The filling layer is made of gravel and elastomer, so that the filling layer has the advantages of large pore structure and high permeability, which is beneficial to the flow of gas and leachate, and at the same time has a certain degree of flexibility. After the garbage dump is covered above the filling layer, it can form a certain protection for the drainage pipe, so that the drainage pipe is not easy to be damaged under the condition of the overlying load.

In addition, since the mass ratio of the elastomer in the multi-layered filling layer decreases sequentially from bottom to top, this not only makes the upper filling layer have sufficient strength to adapt to the support of the garbage fill, but also makes the lower filling layer relatively strong. The upper filling layer has greater flexibility. When the guide tube is under the action of the overlying load, the guide tube can move appropriately downward and sideways. Under the protection of this cushioning performance, the guide tube is not easy to be damaged. Further improve the service life of the drainage pipe and improve the drainage effect of leachate.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural schematic diagram of a kind of horizontal guiding system of landfill of the utility model embodiment;

Fig. 2 is a schematic diagram of the layout of the filter layer in the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Firstly, the embodiment of the utility model discloses a horizontal guide and drainage system for a landfill.

Fig. 1 is a schematic structural view of a horizontal guide and drainage system of a landfill according to an embodiment of the present invention. Referring to Fig. 1, the system includes:

ditch 1;

Multi-layer filling layer, the multi-layer filling layer is laid in the ditch sequentially from bottom to top, the filling layer is formed by accumulation of gravel and elastomer, and the mass ratio of elastomer in the multi-layer filling layer from bottom to top decreases successively;

The drainage pipe 2 is laid horizontally in the lowest filling layer.

In the horizontal drainage system of the landfill provided by the embodiment of the utility model, since the multi-layer filling layers are successively laid in the ditch from bottom to top, the drainage pipes are laid horizontally in the bottom filling layer , while the filling layer is made up of crushed stones and elastomers, so that the filling layer has the advantages of large pore structure and high permeability, which is beneficial to the long-term drainage of gas and leachate, and at the same time has a certain Flexible, when the top of the filling layer is covered with the garbage dump, it can form a certain protection for the drainage pipe, so that the drainage pipe is not easy to be damaged under the condition of the overlying load.

In addition, since the mass ratio of the elastomer in the multi-layered filling layer decreases sequentially from bottom to top, this not only makes the upper filling layer have sufficient strength to adapt to the support of the garbage fill, but also makes the lower filling layer relatively strong. The upper filling layer has greater flexibility. When the guide tube is under the action of the overlying load, the guide tube can move appropriately downward and sideways. Under the protection of this cushioning performance, the guide tube is not easy to be damaged. Further improve the service life of the drainage pipe and improve the drainage effect of leachate.

Preferably, the elastic body of the embodiment of the present utility model can be waste tire fragments, waste tire fragments have a wide range of sources, and are waste products. Under the condition that it is difficult to obtain gravel materials around the area where many landfills are located, waste tires can be used Fragments are used as a part of the guide material, which can save the cost of freight and filler purchase, and also realize the reuse of waste tires.

Of course, the elastic body in the embodiment of the present invention may also be one of rubber, high-density polyethylene or a mixture of the two, which is not limited in the embodiment of the present invention.

1, the filling layer of the embodiment of the present invention can be provided with two sides, including the first filling layer 3 at the bottom and the second filling layer 4 at the top, between the first filling layer 3 and the second filling layer 4 A filter layer 5 is provided.

Of course, the depth of the ditch can also be actually set for the filling layer, which is not limited by the embodiments of the present utility model.

Further, in the embodiment of the present utility model, the upper surface of the drain pipe 2 is flush with the top of the first filling layer 3 .

Further, in the first filling layer 3, the mass ratio of the elastomer to the gravel is 20%-35%, and the size of the elastomer is less than 3-4 times the maximum diameter of the gravel, while in the second filling layer 4, the elastomer The mass ratio of the crushed stone is 10%-15%, and the size of the elastic body is 2-3 times smaller than the maximum diameter of the crushed stone.

Fig. 2 is a schematic diagram of the layout of the filter layer in the embodiment of the utility model. With reference to Fig. 2, the filter layer 5 of the embodiment of the utility model can be a geotechnical filter, and the width ends of the geotechnical filter are anchored in the side wall of the ditch 1.

Further, a groove 6 is provided on the side wall of the ditch 1, and after the two ends of the width of the geotechnical screen are buried in the groove 6, the geotechnical screen is anchored by filling soil.

In order to prevent the filling layer from directly acting on the drainage pipe 2, the embodiment of the utility model also wraps a geotextile on the peripheral surface of the drainage pipe 2, and further improves the service life of the drainage pipe 2 without affecting the drainage. .

In addition, the embodiment of the present utility model also provides a construction method for the above-mentioned horizontal guiding and drainage system of the landfill, the construction method including:

Step 1: Dig a ditch in the garbage dump body, the ditch has a certain width and depth, and has integrity.

Step 2: laying a part of the lowest filling layer at the bottom of the ditch to form the construction foundation;

Step 3: Place the drainage pipe on the construction foundation, and continue laying another part of the bottom filling layer on the construction foundation until the construction of the bottom filling layer is completed. In this step, the drainage pipe can be wrapped with geotextiles. The bottom filling layer is filled to the upper surface close to the drain pipe;

Step 4: Lay the rest of the filling layers on the bottom filling layer in turn until the ditch is filled, and a filter layer can be laid between each filling layer.

The above-mentioned construction method has simple construction technology, strong operability, low requirements for on-site construction conditions, can save construction costs, and can also ensure construction quality.

After using the utility model, the operation of the guide and drainage system can be maintained for a long time, which greatly reduces the safety risk caused by poor collection of methane and leachate in the landfill.

The following examples are preferred embodiments of the present utility model, which are only used to facilitate the description of the present utility model, and are not intended to limit the present utility model in any way. Any person with ordinary knowledge in the technical field, if not departing from Within the scope of the technical features mentioned in the utility model, the equivalent embodiments that make partial changes or modifications using the technical content disclosed in the utility model, and do not deviate from the technical features of the utility model, still belong to the technology of the utility model within the range of features.

Claims (6)

1. A horizontal drainage system for a landfill, characterized in that the system comprises: ditch; A multi-layer filling layer, the multi-layer filling layer is sequentially laid in the ditch from bottom to top, and the filling layer is formed by accumulating gravel and elastomer; The drainage pipe is laid horizontally in the bottommost filling layer. 2. The horizontal drainage system of the refuse landfill according to claim 1, characterized in that, the elastomer in the filling layer is waste tire fragments. 3. The horizontal drainage system of a landfill according to claim 1, wherein the filling layer is provided with two sides, including a first filling layer at the bottom and a second filling layer at the top , a filter layer is arranged between the first filling layer and the second filling layer. 4 . The horizontal drainage system for landfill according to claim 3 , wherein the upper surface of the drainage pipe is flush with the top of the first filling layer. 5 . 5. The horizontal drainage system of the refuse landfill according to claim 3, wherein the filter layer is a geotechnical filter, and the two ends of the width of the geotechnical filter are anchored in the side wall of the ditch . 6 . The horizontal drainage system for waste landfill according to claim 3 , characterized in that, the peripheral surface of the drainage pipe is wrapped with a geotextile. 7 .