CN111636539B

CN111636539B - Assembled longitudinal and transverse guide drainage system for refuse landfill and construction method thereof

Info

Publication number: CN111636539B
Application number: CN202010518469.XA
Authority: CN
Inventors: 黄河; 罗彪; 罗正东; 沈程鹏; 尹鸿达; 胡勇; 李检保; 王倩; 谢测坤
Original assignee: Yueyang City Road & Bridges Construction Co; Xiangtan University
Current assignee: YUEYANG CITY ROAD & BRIDGES CONSTRUCTION Co.; Xiangtan University
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-04-16
Anticipated expiration: 2040-06-09
Also published as: CN111636539A

Abstract

The invention discloses an assembled longitudinal and transverse guide and drainage system for a refuse landfill and a construction method thereof. The assembled longitudinal and transverse guide and drainage system for the refuse landfill comprises a liner structure, a reservoir body guide and drainage structure and a longitudinal and transverse guide and drainage system, wherein the liner structure comprises a tamped clay bottom layer, a geomembrane, a tamped clay surface layer and an UHPC (ultra high performance polycarbonate) injection impermeable layer; the storehouse body guide drainage structure comprises a UHPC collecting well, a steel grating well cover, a circular pipeline port, a storehouse body geotechnical composite drainage network, a storehouse body cleaning crushed stone layer and a clay sealing layer; the longitudinal and transverse drainage system comprises a UHPC core drainage pipe, a UHPC longitudinal drainage pipe, a UHPC transverse drainage pipe, a submersible sewage pump, a lifting rope and a drainage hose. The invention adopts the assembly type construction, has short construction period and reliable and durable structure, can control the main water level of the percolate for a long time, and has the advantages of good drainage effect, long life cycle and low maintenance cost.

Description

Assembled longitudinal and transverse guide drainage system for refuse landfill and construction method thereof

Technical Field

The invention relates to the technical field of refuse landfill drainage guide, in particular to an assembled longitudinal and transverse drainage guide system for a refuse landfill and a construction method thereof.

Background

Landfill is an important method for treating municipal solid waste. Landfill sites lacking strict seepage prevention and drainage measures are a huge pollution source, generated leachate pollutes underground water, and overflowed landfill gas pollutes air. Most of the conventional landfill sites lack effective drainage measures, and the problems of unstable landslide, landfill gas explosion, fire and the like of a garbage stack body caused by more percolate and landfill gas accumulated in the landfill sites; the distortion and even damage of the common guide pipe are easily caused by the operation of large machinery at the upper part and the sedimentation of the garbage pile body, and the repair and the replacement are difficult; well drilling construction is usually adopted for later-stage construction of the guide bar system, the construction is complicated, the work amount is large, the guide bar effect is not good, and the landfill gas leakage pollution environment is easily caused.

In order to solve the problems of percolate accumulation and seepage and reduce the leakage risk of landfill gas, the invention provides an assembled longitudinal and transverse drainage guide system for a refuse landfill and a construction method thereof, which can control the main percolate level in the refuse landfill for a long time and improve the landfill gas collection rate and the stability of a refuse dump slope. The UHPC core guide and exhaust pipe, the UHPC longitudinal guide and exhaust pipe and the UHPC transverse guide and exhaust pipe of the longitudinal and transverse guide and exhaust system are all prefabricated by ultra-high performance concrete (UHPC) materials with ultra-high strength, high crack resistance and high durability, can reduce the influence of the lateral displacement and uneven settlement of a garbage stack on the guide and exhaust system, can resist the corrosion of percolate, and has the advantages of reliable structure, high construction speed, good guide and exhaust effect, long life cycle and low maintenance cost.

Disclosure of Invention

The invention aims to provide an assembled longitudinal and transverse guide row system for a refuse landfill and a construction method thereof, wherein the assembled longitudinal and transverse guide row system is reliable in structure, high in construction speed, good in guide row effect, long in life cycle and low in maintenance cost.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an assembled longitudinal and transverse guide and drainage system for a refuse landfill comprises a liner structure, a reservoir body guide and drainage structure and a longitudinal and transverse guide and drainage system, wherein the liner structure comprises a tamped clay bottom layer, a geomembrane, a tamped clay surface layer and a spraying UHPC (ultra high performance concrete) impermeable layer which are sequentially stacked from outside to inside;

the storehouse body drainage guide structure comprises a UHPC (ultra high Performance concrete) collecting well, a steel grating well cover, a circular pipeline port, a storehouse body geotechnical composite drainage net, a storehouse body cleaning gravel layer and a clay sealing layer, wherein the UHPC collecting well is arranged at the center of the bottom of the liner structure, the steel grating well cover is arranged on the UHPC collecting well, the circular pipeline port is formed at the center of the steel grating well cover, the storehouse body geotechnical composite drainage net and the storehouse body cleaning gravel layer are sequentially laid on the UHPC spraying impermeable layer, and the clay sealing layer is arranged at the tops of the storehouse body geotechnical composite drainage net and the storehouse body cleaning gravel layer;

the longitudinal and transverse drainage system comprises a UHPC core drainage pipe, a UHPC longitudinal drainage pipe, a UHPC transverse drainage pipe, a submersible sewage pump, a lifting rope and a drainage hose; the UHPC core drainage guide pipe, the UHPC longitudinal drainage guide pipe and the UHPC transverse drainage guide pipe are wrapped with geotextile and a geotechnical composite drainage network from inside to outside, the UHPC core drainage guide pipe is vertically arranged on the UHPC collecting well in cooperation with a circular pipe opening, the UHPC longitudinal drainage guide pipe is arranged on the side wall of the liner structure, and the UHPC transverse drainage guide pipe is transversely arranged inside the garbage pile body; the submersible sewage pump is bound with a lifting rope and is placed in the UHPC collecting well; the UHPC core drainage guide pipe and the UHPC longitudinal drainage guide pipe are communicated with an off-site landfill gas collecting device; one end of the drainage hose is connected with the submersible sewage pump, and the other end of the drainage hose is connected with the off-site leachate collecting device.

In a further improvement, the bottom of the liner structure is formed into an inverted quadrangular frustum pyramid with the height of 300-500 mm, so that leachate can be guided to a UHPC (ultra high performance polycarbonate) collecting well; the thicknesses of the tamped clay bottom layer and the tamped clay surface layer are consistent and are both 180-260 mm; the spraying UHPC impermeable layer is arranged on the surface of the tamped clay surface layer, and the thickness of the spraying UHPC impermeable layer is 20-40 mm.

The further improvement is that the length of the UHPC collecting well is 1000-1200 mm, the width is 1000-1200 mm, and the height is 1000-1200 mm; the diameter of the circular pipe orifice is 600-1000 mm, and a strip-shaped water leakage grating is further arranged on the steel grating well cover.

In a further improvement, the UHPC core drainage guide pipe is vertically arranged on the UHPC collecting well in a way of being matched with a circular pipe opening; the inner diameter of the UHPC core guide exhaust pipe is the same as that of the circular pipeline opening; the inner diameter of the UHPC core guide exhaust pipe is 600-1000 mm, and the thickness of the UHPC core guide exhaust pipe is 30-50 mm; through holes distributed in a quincunx shape are formed in the periphery of the UHPC core drainage pipe, and the through holes are not formed within 1000-1200 mm of the top of the UHPC core drainage pipe, so that landfill gas leakage and rainwater are prevented from entering a longitudinal and transverse drainage system; the UHPC core row-guide pipe is provided with a first round rabbet matched with the UHPC transverse row-guide pipe, and the diameter of the first round rabbet is 200-300 mm.

The further improvement is that the diameter of the UHPC longitudinal guide exhaust pipe is 400-500 mm; through holes distributed in a quincunx shape are formed in the periphery of the UHPC longitudinal drainage guide pipe, and the through holes are not formed within 1000-1200 mm of the distance from the top of the UHPC longitudinal drainage guide pipe; and a second round rabbet matched with the UHPC transverse guide exhaust pipe is arranged on the UHPC longitudinal guide exhaust pipe, and the diameter of the second round rabbet is 200-300 mm.

In a further improvement, one end of the UHPC transverse guide and exhaust pipe is in matched butt joint with a first circular rabbet on the UHPC core guide and exhaust pipe, the other end of the UHPC transverse guide and exhaust pipe is in matched butt joint with a second circular rabbet on the UHPC longitudinal guide and exhaust pipe, and the UHPC transverse guide and exhaust pipe inclines towards the UHPC core guide and exhaust pipe by 3%, so that percolate can be guided to the UHPC core guide and exhaust pipe; the diameter of the UHPC transverse guide exhaust pipe is 200-300 mm; the UHPC transverse drainage guide pipe is placed downwards, one side of the UHPC transverse drainage guide pipe is not provided with through holes, and the other pipe bodies are provided with quincunx-shaped distributed through holes to form a percolate flow guide channel.

In a further improvement, the diameter of the through hole is 20-40 mm.

The further improvement is that the UHPC injection impervious layer is formed by injecting UHPC materials, and the UHPC collecting well, the UHPC core drainage pipe, the UHPC longitudinal drainage pipe and the UHPC transverse drainage pipe are all prefabricated by UHPC materials.

In further improvement, the composition and parts by weight of the UHPC material are as follows: 270-304 parts of Portland cement; 25-38 parts of steel fiber; 482-615 parts of quartz sand; 115-140 parts of fly ash; 14-28 parts of silica fume; 5-8 parts of a water reducing agent; and 68-92 parts of mixing water.

A construction method of an assembled longitudinal and transverse guide row system for a refuse landfill comprises the following steps:

the method comprises the following steps: measuring and paying off, and excavating earth and stone;

step two: prefabricating a UHPC collecting well with a designed size, a UHPC core drainage pipe, a UHPC longitudinal drainage pipe and a UHPC transverse drainage pipe;

step three: leveling a field, paving a tamped clay bottom layer, removing surface coarse particles, leveling, paving a geomembrane, continuously paving a tamped clay surface layer, and finally completing spraying of an UHPC (ultra high performance concrete) impermeable layer by spraying construction, wherein the bottom of the liner structure is formed into an inverted quadrangular frustum with the height of 300-500 mm and is used for guiding percolate to an UHPC (ultra high performance concrete) collecting well;

step IV: hoisting a prefabricated UHPC collecting well and placing the UHPC collecting well at the central position of the bottom of the liner structure, placing a steel grating well cover on the UHPC collecting well, and sequentially laying a storehouse body geotechnical composite drainage net and a storehouse body cleaning gravel layer on the sprayed UHPC impermeable layer;

step five: the surface of the UHPC core drainage pipe is wrapped with geotechnical cloth and a geotechnical composite drainage network from inside to outside, and the UHPC core drainage pipe is vertically placed on a UHPC collecting well in cooperation with a circular pipe opening;

step (c): the surface of the UHPC longitudinal drainage pipe is wrapped with geotextile and a geotechnical composite drainage net from inside to outside, and the UHPC longitudinal drainage pipe is placed on the side wall of the liner structure;

step (c): the surface of the UHPC transverse guide and discharge pipe is wrapped with geotextile and a geotechnical composite drainage network from inside to outside, a garbage stack is filled to a design height, the UHPC transverse guide and discharge pipe is lifted, one side without a through hole is placed downwards, one end of the UHPC transverse guide and discharge pipe is matched and butted with a first circular rabbet on the UHPC core guide and discharge pipe, the other end of the UHPC transverse guide and discharge pipe is matched and butted with a second circular rabbet on the UHPC longitudinal guide and discharge pipe, and the UHPC transverse guide and discharge pipe inclines 3% towards the direction of the UHPC core guide and discharge pipe at the moment, so that percolate can be guided to the UHPC core guide and;

step (v): one end of a drainage hose is connected with a submersible sewage pump, the other end of the drainage hose is connected with an off-site leachate collecting device, a lifting rope is tied on the submersible sewage pump, and the submersible sewage pump is lowered into a UHPC collecting well through a UHPC core drainage pipe and a circular pipeline opening;

step ninthly: arranging clay sealing layers at the positions 1000-1200 mm away from the top of the refuse landfill site and on the tops of the reservoir soil engineering composite drainage net and the reservoir body cleaning gravel layer, wherein the clay sealing layers are used for preventing landfill gas from leaking and preventing rainwater from entering the reservoir body drainage guide structure;

step (r): and finally, communicating the UHPC core guide-discharge pipe and the UHPC longitudinal guide-discharge pipe with an off-site landfill gas collecting device, and finally finishing the fabricated longitudinal and transverse guide-discharge system for the refuse landfill.

The invention has the technical effects that:

(1) the UHPC core drainage guide pipe, the UHPC longitudinal drainage guide pipe and the UHPC transverse drainage guide pipe are all prefabricated by UHPC materials; the UHPC material has ultrahigh strength, so that the risk of breakage and failure of the guide and discharge pipe under the action of the action force of the overlying garbage pile is effectively reduced; the UHPC material also has high crack resistance and high durability, can resist the corrosion of percolate, ensures the continuity and effectiveness of a drainage guide system and improves the life cycle of a refuse landfill;

(2) the longitudinal and transverse drainage guide system can control the main percolate level in the refuse landfill for a long time, improve the landfill gas collection rate and the stability of the refuse pile side slope, change the collected landfill gas into valuable, and use the valuable as clean energy, thereby protecting the environment and saving resources;

(3) the longitudinal and transverse guide and drainage system adopts assembly type construction, has short construction period and reliable and durable structure, can effectively reduce the influence of the lateral displacement and the uneven settlement of the garbage pile on the guide and drainage system, and also has the advantages of good guide and drainage effect, long life cycle and low maintenance cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic cross-sectional view of a vertical/horizontal drainage guide system according to the present invention;

FIG. 2 is a schematic top view of a vertical/horizontal drainage guide system according to the present invention;

FIG. 3 is a cross-sectional view taken along line 1-1 of FIG. 2;

FIG. 4 is a schematic view of the structure of a UHPC collection well and a steel grating well cover according to the present invention;

FIG. 5 is a schematic top view showing the connection of the UHPC core row-guide pipes, the UHPC longitudinal row-guide pipes and the UHPC transverse row-guide pipes according to the present invention;

FIG. 6 is a schematic view of the structure of UHPC core row-guide tube of the present invention;

FIG. 7 is a schematic view of the structure of a UHPC longitudinal row-guiding pipe of the present invention;

fig. 8 is a schematic structural view of a UHPC transverse drainage pipe of the present invention.

The system comprises a base layer, a soil layer, a surface layer, a sealing layer, a soil layer, a cleaning gravel layer, a soil sealing layer, a core UHPC pipe guide and discharge pipe 11, a longitudinal UHPC pipe guide and discharge pipe 12, a transverse UHPC pipe guide and discharge pipe 13, a submersible sewage pump 14, a lifting rope 15, a water discharge hose 16, a geotextile 17, a soil composite water discharge net 18, a first circular rabbet 19, a second circular rabbet 20, a garbage pile 21, a through hole 22 and a water leakage grating 23, wherein the base layer is made of tamped clay 1, the surface layer is made of tamped clay 3, the impermeable layer is made of sprayed UHPC 4, the collecting well is made of UHPC 6, the well cover is made of steel grating, the circular pipeline opening is made of steel grating 7, the soil composite water discharge net 8, the cleaning gravel layer is.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 8, the invention provides an assembled longitudinal and transverse guiding and discharging system for a refuse landfill, which comprises a liner structure, a reservoir body guiding and discharging structure and a longitudinal and transverse guiding and discharging system, wherein the liner structure comprises a tamped clay bottom layer 1, a geomembrane 2, a tamped clay top layer 3 and a spraying UHPC impermeable layer 4 which are sequentially stacked from outside to inside. The rammed clay bottom layer 1 and the rammed clay surface layer 3 are consistent in thickness and are both 220mm, and the spraying UHPC impermeable layer 4 is arranged on the surface of the rammed clay surface layer 3 and is 30mm in thickness.

The storehouse body guide and drainage structure comprises a UHPC collecting well 5, a steel grating well cover 6, a circular pipe port 7, a storehouse body geotechnical composite drainage network 8, a storehouse body cleaning gravel layer 9 and a clay sealing layer 10. The UHPC collecting well 5 is arranged at the center of the bottom of the liner structure, the steel grating well cover 6 is arranged on the UHPC collecting well 5, the circular pipeline port 7 is formed at the center of the steel grating well cover 6 and is used for being matched with the UHPC core guide and discharge pipe 11, the storehouse body geotechnical composite drainage network 8 and the storehouse body cleaning gravel layer 9 are sequentially laid on the UHPC spraying impermeable layer 4, and the clay sealing layer 10 is arranged at the tops of the storehouse body geotechnical composite drainage network 8 and the storehouse body cleaning gravel layer 9 and is used for preventing landfill gas leakage and rainwater from entering the storehouse body guide and discharge structure.

It should be further explained that the length of the UHPC collecting well 5 is 1000-1200 mm, the width is 1000-1200 mm, the height is 1000-1200 mm, the diameter of the circular pipeline opening 7 is 600-1000 mm, and the steel grating well cover 6 is also provided with a strip-shaped water leakage grating 23.

The bottom of the pad structure is shaped as an inverted quadrangular frustum with a height of 400mm, facilitating the guiding of the percolate to the UHPC collection well 5.

The longitudinal and transverse drainage system comprises a UHPC core drainage pipe 11, a UHPC longitudinal drainage pipe 12, a UHPC transverse drainage pipe 13, a submersible sewage pump 14, a lifting rope 15 and a drainage hose 16; the UHPC core drainage guide pipe 11, the UHPC longitudinal drainage guide pipe 12 and the UHPC transverse drainage guide pipe 13 are all wrapped with geotextile 17 and a geotechnical composite drainage network 18 from inside to outside, the UHPC core drainage guide pipe 11 is matched with a circular pipe opening 7 to be vertically arranged on the UHPC collecting well 5, the UHPC longitudinal drainage guide pipe 12 is arranged on the side wall of the liner structure, and the UHPC transverse drainage guide pipe 13 is transversely arranged inside the garbage pile body 21. The submersible sewage pump 14 is bound with a lifting rope 15 and placed in the UHPC collecting well 5, and if the submersible sewage pump 14 fails, the submersible sewage pump can be taken out for repair or replacement through the lifting rope 15. The UHPC core guide-exhaust pipe 11 and the UHPC longitudinal guide-exhaust pipe 12 are communicated with an off-site landfill gas collecting device. One end of the drainage hose 16 is connected with the submersible sewage pump 14, and the other end is connected with the off-site leachate collecting device.

It should be further explained that the inner diameter of the UHPC core row-guide tube 11 is the same as the circular duct opening 7, the inner diameter of the UHPC core row-guide tube 11 is 600-1000 mm, and the thickness is 30-50 mm. Through holes 22 distributed in a quincunx shape are formed in the periphery of the UHPC core drainage pipe 11, and the through holes 22 are not formed within 1000-1200 mm of the top of the UHPC core drainage pipe 11, so that landfill gas leakage and rainwater are prevented from entering the longitudinal and transverse drainage systems. The UHPC core row-guide pipe 11 is provided with a first round rabbet 19 matched with the UHPC transverse row-guide pipe 13, and the diameter of the first round rabbet 19 is 200-300 mm.

The diameter of the UHPC longitudinal drainage pipe 12 is 500mm, the periphery of the UHPC longitudinal drainage pipe 12 is provided with quincunx-shaped distributed through holes 22, and the through holes 22 are not formed within 1200mm of the top of the UHPC longitudinal drainage pipe 12, so that landfill gas leakage and rainwater are prevented from entering a longitudinal and transverse drainage system. And a second round rabbet 20 matched with the UHPC transverse guide exhaust pipe 13 is arranged on the UHPC longitudinal guide exhaust pipe 12, and the diameter of the second round rabbet 20 is 300 mm.

It should be further noted that, the UHPC transverse pipe 13 is at a third distance from the top of the garbage stack 21, one end of the UHPC transverse pipe 13 is in matched butt joint with a first circular rabbet 19 on the UHPC core pipe 11, and the other end of the UHPC transverse pipe 13 is in matched butt joint with a second circular rabbet 20 on the UHPC longitudinal pipe 12, and inclines 3% toward the UHPC core pipe 11, which is favorable for guiding the percolate to the UHPC core pipe 11. The diameter of the UHPC transverse drainage pipe 13 is 300 mm; the UHPC transverse drainage guide pipe 13 is placed downwards, one side of the UHPC transverse drainage guide pipe is not provided with through holes 22, the other pipe bodies are provided with the through holes 22 distributed in a quincunx shape, a percolate guide channel is formed, and particularly, the diameter of each through hole 22 is 30 mm.

The UHPC injection impermeable layer 4 is formed by injecting UHPC materials, and the UHPC collecting well 5, the UHPC core discharge guide pipe 11, the UHPC longitudinal discharge guide pipe 12 and the UHPC transverse discharge guide pipe 13 are all formed by prefabricating UHPC materials. Specifically, the UHPC material comprises the following components in parts by weight: 280 parts of Portland cement; 28 parts of steel fiber; 520 parts of quartz sand; 122 parts of fly ash; 20 parts of silica fume; 7 parts of a water reducing agent; 78 parts of mixing water.

In order to realize the assembled longitudinal and transverse guide row system for the refuse landfill, the invention provides a construction method based on the assembled longitudinal and transverse guide row system for the refuse landfill, which comprises the following steps:

step two: prefabricating a UHPC collecting well 5 with a designed size, a UHPC core drainage pipe 11, a UHPC longitudinal drainage pipe 12 and a UHPC transverse drainage pipe 13;

step three: leveling a field, paving a tamped clay bottom layer 1, removing surface coarse particles, leveling, paving a geomembrane 2, continuously paving a tamped clay surface layer 3, finishing spraying construction to finish spraying a UHPC (ultra high performance concrete) impermeable layer 4, and forming the bottom of a liner structure into an inverted quadrangular frustum with the height of 400mm for guiding percolate to a UHPC (ultra high performance concrete) collecting well 5;

step IV: hoisting a prefabricated UHPC collecting well 5 and placing the UHPC collecting well at the center of the bottom of the liner structure, placing a steel grating well cover 6 on the UHPC collecting well 5, and sequentially laying a storehouse body soil engineering composite drainage network 8 and a storehouse body cleaning gravel layer 9 on the sprayed UHPC impermeable layer 4;

step five: the surface of the UHPC core drainage guide pipe 11 is wrapped with geotechnical cloth 17 and a geotechnical composite drainage network 18 from inside to outside, and the UHPC core drainage guide pipe 11 is vertically placed on the UHPC collecting well 5 in cooperation with the circular pipe orifice 7;

step (c): the surface of the UHPC longitudinal drainage guide pipe 12 is wrapped with geotextile 17 and a geotechnical composite drainage net 18 from inside to outside, and the UHPC longitudinal drainage guide pipe 12 is placed on the side wall of the liner structure;

step (c): the surface of the UHPC transverse guide and exhaust pipe 13 is wrapped with geotextile 17 and a geotechnical composite drainage network 18 from inside to outside, a garbage stack body 21 is filled to a designed height, the UHPC transverse guide and exhaust pipe 13 is lifted, one side without a through hole 22 is placed downwards, one end of the UHPC transverse guide and exhaust pipe 13 is in matched butt joint with a first circular rabbet 19 on the UHPC core guide and exhaust pipe 11, the other end of the UHPC transverse guide and exhaust pipe is in matched butt joint with a second circular rabbet 20 on the UHPC longitudinal guide and exhaust pipe 12, and the UHPC transverse guide and exhaust pipe 13 inclines 3% towards the UHPC core guide and exhaust pipe 11 at the moment, so that percolate is guided to the UHPC core guide and exhaust;

step (v): one end of a drainage hose 16 is connected with a submersible sewage pump 14, the other end of the drainage hose is connected with an off-site leachate collecting device, a lifting rope 15 is tied on the submersible sewage pump 14, and the submersible sewage pump is lowered into a UHPC collecting well 5 through a UHPC core drainage pipe 11 and a circular pipeline opening 7;

step ninthly: a clay sealing layer 10 is arranged at the position 1200mm away from the top of the refuse landfill site and on the top of the reservoir soil engineering composite drainage network 8 and the reservoir body cleaning gravel layer 9, and is used for preventing landfill gas from leaking and preventing rainwater from entering a reservoir body drainage guide structure;

step (r): and finally, communicating the UHPC core guide-discharge pipe 11 and the UHPC longitudinal guide-discharge pipe 12 with an off-site landfill gas collecting device, and finally finishing the fabricated longitudinal and transverse guide-discharge system for the refuse landfill.

While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the specification and the embodiments, which are fully applicable to various fields of endeavor for which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. The utility model provides a horizontal drainage guide system is indulged with assembled to landfill, includes liner structure, storehouse body drainage guide structure and indulges horizontal drainage guide system, its characterized in that: the liner structure comprises a tamped clay bottom layer (1), a geomembrane (2), a tamped clay surface layer (3) and a spraying UHPC (ultra high performance polycarbonate) impermeable layer (4) which are sequentially stacked from outside to inside;

the storehouse body drainage guide structure comprises a UHPC (ultra high performance) collecting well (5), a steel grating well cover (6), a circular pipeline port (7), a storehouse body geotechnical composite drainage network (8), a storehouse body cleaning gravel layer (9) and a clay sealing layer (10), wherein the UHPC collecting well (5) is arranged at the center of the bottom of the liner structure, the steel grating well cover (6) is arranged on the UHPC collecting well (5), the circular pipeline port (7) is formed at the center of the steel grating well cover (6), the storehouse body geotechnical composite drainage network (8) and the storehouse body cleaning gravel layer (9) are sequentially laid on the UHPC spraying impermeable layer (4), and the clay sealing layer (10) is arranged at the tops of the storehouse body geotechnical composite drainage network (8) and the storehouse body cleaning gravel layer (9);

the longitudinal and transverse drainage system comprises a UHPC core drainage pipe (11), a UHPC longitudinal drainage pipe (12), a UHPC transverse drainage pipe (13), a submersible sewage pump (14), a lifting rope (15) and a drainage hose (16); the UHPC core drainage guide pipe (11), the UHPC longitudinal drainage guide pipe (12) and the UHPC transverse drainage guide pipe (13) are wrapped with geotextile (17) and a geotechnical composite drainage network (18) from inside to outside, the UHPC core drainage guide pipe (11) is vertically arranged on the UHPC collecting well (5) in a manner of being matched with the circular pipeline port (7), the UHPC longitudinal drainage guide pipe (12) is arranged on the side wall of the liner structure, and the UHPC transverse drainage guide pipe (13) is transversely arranged inside the garbage stack body (21); the submersible sewage pump (14) is bound with a lifting rope (15) and is placed in the UHPC collecting well (5); the UHPC core guide-exhaust pipe (11) and the UHPC longitudinal guide-exhaust pipe (12) are communicated with an off-site landfill gas collecting device; one end of the drainage hose (16) is connected with the submersible sewage pump (14), and the other end of the drainage hose is connected with the off-site leachate collecting device;

through holes (22) distributed in a quincunx shape are formed in the periphery of the UHPC core guide exhaust pipe (11), and the through holes (22) are not formed within 1000-1200 mm of the top of the UHPC core guide exhaust pipe (11); one side of the UHPC transverse drainage guide pipe (13) is placed downwards and is not provided with through holes (22), and the other pipe bodies are provided with the through holes (22) distributed in a quincunx shape to form a percolate flow guide channel.

2. The fabricated transverse and longitudinal drainage system for landfill sites of claim 1, wherein: the bottom of the liner structure is formed into an inverted quadrangular frustum pyramid with the height of 300-500 mm and used for guiding percolate to a UHPC (ultra high performance polycarbonate) collecting well (5);

the thicknesses of the tamped clay bottom layer (1) and the tamped clay top layer (3) are consistent and are both 180-260 mm;

the spraying UHPC impermeable layer (4) is arranged on the surface of the tamped clay surface layer (3) and is 20-40 mm thick.

3. The fabricated transverse and longitudinal drainage system for landfill sites of claim 1, wherein: the length of the UHPC collecting well (5) is 1000-1200 mm, the width is 1000-1200 mm, and the height is 1000-1200 mm; the diameter of the circular pipeline opening (7) is 600-1000 mm, and a strip-shaped water leakage grating (23) is further arranged on the steel grating well cover (6).

4. The fabricated transverse and longitudinal drainage system for landfill sites of claim 1, wherein: the inner diameter of the UHPC core guide exhaust pipe (11) is the same as that of the circular pipeline opening (7); the inner diameter of the UHPC core guide exhaust pipe (11) is 600-1000 mm, and the thickness is 30-50 mm;

the UHPC core row-guide pipe (11) is provided with a first round rabbet (19) matched with the UHPC transverse row-guide pipe (13), and the diameter of the first round rabbet (19) is 200-300 mm.

5. The fabricated transverse and longitudinal drainage system for landfill sites of claim 1, wherein: the diameter of the UHPC longitudinal guide exhaust pipe (12) is 400-500 mm;

through holes (22) distributed in a quincunx shape are formed in the periphery of the UHPC longitudinal exhaust guide pipe (12), and the through holes (22) are not formed within 1000-1200 mm of the top of the UHPC longitudinal exhaust guide pipe (12);

and a second round rabbet (20) matched with the UHPC transverse guide exhaust pipe (13) is arranged on the UHPC longitudinal guide exhaust pipe (12), and the diameter of the second round rabbet (20) is 200-300 mm.

6. The fabricated transverse and longitudinal drainage system for landfill sites of claim 1, wherein: one end of the UHPC transverse guide and exhaust pipe (13) is in matched butt joint with a first round rabbet (19) on the UHPC core guide and exhaust pipe (11), the other end of the UHPC transverse guide and exhaust pipe (13) is in matched butt joint with a second round rabbet (20) on the UHPC longitudinal guide and exhaust pipe (12), and the UHPC transverse guide and exhaust pipe is inclined 3% towards the UHPC core guide and exhaust pipe (11), so that percolate can be guided to the UHPC core guide and exhaust pipe (11); the diameter of the UHPC transverse drainage pipe (13) is 200-300 mm.

7. The fabricated transverse and longitudinal drainage system for landfill sites of claim 4, 5 or 6, wherein: the diameter of the through hole (22) is 20-40 mm.

8. The fabricated transverse and longitudinal drainage system for landfill sites of claim 1, wherein: the UHPC injection impermeable layer (4) is formed by injecting UHPC materials, and the UHPC collecting well (5), the UHPC core discharge guide pipe (11), the UHPC longitudinal discharge guide pipe (12) and the UHPC transverse discharge guide pipe (13) are all prefabricated by UHPC materials.

9. The fabricated transverse and longitudinal drainage system for landfill sites of claim 8, wherein: the UHPC material comprises the following components in parts by weight: 270-304 parts of Portland cement; 25-38 parts of steel fiber; 482-615 parts of quartz sand; 115-140 parts of fly ash; 14-28 parts of silica fume; 5-8 parts of a water reducing agent; and 68-92 parts of mixing water.

10. A construction method of the fabricated transverse and longitudinal guide row system for the refuse landfill based on the system as claimed in claim 1, wherein the system comprises the following steps: the method comprises the following steps:

step two: prefabricating a UHPC collecting well (5) with a designed size, a UHPC core drainage pipe (11), a UHPC longitudinal drainage pipe (12) and a UHPC transverse drainage pipe (13);

step three: leveling a field, paving a tamped clay bottom layer (1), removing surface coarse particles, leveling, paving a geomembrane (2), continuously paving a tamped clay surface layer (3), and finally completing spraying of an UHPC (ultra high performance concrete) impermeable layer (4) by spraying construction, wherein the bottom of the liner structure is formed into an inverted quadrangular frustum with the height of 300-500 mm and is used for guiding the percolate to an UHPC (ultra high performance concrete) collecting well (5);

step IV: hoisting a prefabricated UHPC collecting well (5) and placing the well at the center of the bottom of the liner structure, placing a steel grid well cover (6) on the UHPC collecting well (5), and sequentially laying a reservoir soil engineering composite drainage network (8) and a reservoir clean gravel layer (9) on the sprayed UHPC impermeable layer (4);

step five: the surface of the UHPC core drainage guide pipe (11) is wrapped with geotextile (17) and a geotechnical composite drainage network (18) from inside to outside, and the UHPC core drainage guide pipe (11) is matched with the circular pipeline port (7) and vertically placed on the UHPC collecting well (5);

step (c): the surface of the UHPC longitudinal drainage pipe (12) is wrapped with geotextile (17) and a geotechnical composite drainage net (18) from inside to outside, and the UHPC longitudinal drainage pipe (12) is placed on the side wall of the liner structure;

step (c): the surface of the UHPC transverse guide and exhaust pipe (13) is wrapped with geotextile (17) and a geotechnical composite drainage network (18) from inside to outside, a garbage stack body (21) is filled to a designed height, the UHPC transverse guide and exhaust pipe (13) is lifted, one side without a through hole (22) is placed downwards, one end of the UHPC transverse guide and exhaust pipe (13) is in matched butt joint with a first round rabbet (19) on the UHPC core guide and exhaust pipe (11), the other end of the UHPC transverse guide and exhaust pipe is in matched butt joint with a second round rabbet (20) on the UHPC longitudinal guide and exhaust pipe (12), and the UHPC transverse guide and exhaust pipe (13) inclines 3% to the UHPC core guide and exhaust pipe (11) at the moment and is used for guiding percolate to the UHPC core guide and exhaust;

step (v): one end of a drainage hose (16) is connected with a submersible sewage pump (14), the other end of the drainage hose is connected with an off-site leachate collecting device, a lifting rope (15) is tied on the submersible sewage pump (14), and the drainage hose is lowered into a UHPC collecting well (5) through a UHPC core drainage pipe (11) and a circular pipe opening (7);

step ninthly: arranging a clay sealing layer (10) at the top of the reservoir soil engineering composite drainage net (8) and the reservoir body cleaning gravel layer (9) at a distance of 1000-1200 mm from the top of the refuse landfill;

step (r): and finally, communicating the UHPC core guide-discharge pipe (11) and the UHPC longitudinal guide-discharge pipe (12) with an off-site landfill gas collecting device, and finally finishing the fabricated longitudinal and transverse guide-discharge system for the refuse landfill.