LU504723B1

LU504723B1 - Anchoring structure of landfill liner cushion layer using rice husk ash concrete

Info

Publication number: LU504723B1
Application number: LU504723A
Authority: LU
Inventors: Li Mingfei
Original assignee: Univ Shenyang Technology
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2024-01-15

Abstract

The invention relates to an anchoring structure of a liner cushion layer of a municipal solid waste sanitary landfill, and belongs to the technical field of environmental protection. A liner cushion layer is arranged on the slope of the landfill site, the liner cushion layer is specifically a middle impervious membrane and geotextiles on both sides; an anchor shell of rice husk ash concrete is arranged at the top or middle platform of the slope, is fixed in an anchor groove through precast concrete piles. The liner cushion layer is folded in the rice husk ash concrete anchorage shell, the perforated PVC pipe at the upper part is arranged at the lower part in the anchorage shell, the rice husk ash concrete filler is poured around, gravel is filled at the upper part. The anchoring structure is partially prefabricated, some parts can be standardized.

Description

DESCRIPTION LU504723

ANCHORING STRUCTURE OF LANDFILL LINER CUSHION LAYER USING

RICE HUSK ASH CONCRETE

TECHNICAL FIELD

The invention relates to an anchoring structure of a liner cushion layer of a municipal solid waste sanitary landfill, and belongs to the technical field of environmental protection.

BACKGROUND

With the development of national economy and the improvement of urbanization level, the output of municipal solid waste is increasing sharply. There are three main final disposal methods of municipal solid waste: sanitary landfill, composting and incineration.

Sanitary landfill is the most commonly used garbage disposal technology in the world at present. Sanitary landfill is based on scientific site selection, adopting necessary site protection measures and reasonable landfill structure to minimize and eliminate the impact of garbage on the environment, especially on groundwater pollution. In recent years, many cities have been building large-scale domestic waste landfills.

In urban sanitary landfill, in order to prevent leachate from infiltrating into the ground and causing groundwater pollution, a liner system must be set up. In the process of landfill, garbage is landfilled in layers and blocks. Due to the continuous accumulation and compression of garbage and the effect of landfill vehicles, tension will be formed in the liner cushion layer, which may make the liner system lose its original function. In order to prevent this phenomenon, anchorage zones are generally set at the top of slopes or platforms of segmented slopes.

Generally, the anchorage system of liner cushion layer in landfill site adopts groove/504723 anchorage system, and most of them adopt rectangular section. The geomembrane and the edge of protective fabric are folded in the groove and fixed by pouring cement concrete. In the construction process of this traditional groove anchoring system, the side wall and bottom of the groove need to be reinforced, which requires a large amount of work, a long period of concrete pouring and curing on the cushion layer, and it is difficult to maintain and reinforce if the cushion layer under the concrete anchor body is damaged. Therefore, it has some limitations in functionality and practical performance.

SUMMARY

The purpose of the invention is to provide an anchoring structure of a landfill liner cushion layer using rice husk ash concrete, which can solve or improve the problems of large workload, long construction period, difficult maintenance and reinforcement and the like of the traditional groove anchoring system.

The technical scheme of the invention is as follows.

An anchoring structure of a landfill liner cushion layer using rice husk ash concrete is arranged on the slope of landfill and comprises a cushion layer covering a slope; the cushion layer comprises a middle impervious membrane and geotextile layers at two sides; the middle section of the slope is provided with an intermediate platform; the middle platform is buried with a rice husk ash concrete anchoring shell; the liner cushion layer is folded into the rice husk ash concrete anchoring shell and attached to the inner wall thereof; the rice husk ash concrete anchoring shell has a trapezoidal cross section, the bottom corner is rounded, and the top is provided with an edge parallel to the middle platform; a perforated PVC pipe is arranged in the rice husk ash concrete anchoring shell; rice husk ash concrete filler is poured around the perforated PVC pipe, and gravel is filled at the upper part until the middle platform is flush;

a vertical concrete anchor pile is arranged at the bottom of the pit for placing the ridé504723 husk ash concrete anchor shell; The rice husk ash concrete anchor shell is fixed on the top end of the concrete anchor pile through an expansion bolt and a rubber gasket.

In the anchoring structure of the landfill liner cushion layer using rice husk ash concrete, the rice husk ash concrete anchor shell is narrow at the top and wide at the bottom, with a bottom width of 1100mm and a height of 900mm; the bottom is provided with a groove to provide space for the bolt cap of the expansion bolt, and a steel mesh is arranged inside.

In the anchoring structure of the landfill liner cushion layer using rice husk ash concrete, the perforated PVC pipe has an inner diameter of 600mm and a wall thickness of 20mm, and the wall is provided with holes.

In the anchoring structure of the landfill liner cushion layer using rice husk ash concrete, the gravel has a particle size range of 5-30 mm and is arranged according to the principle of fine bottom and thick top.

In the anchoring structure of the landfill liner cushion layer using rice husk ash concrete, concrete anchor pile has a length of 1.5 m, a diameter of 25 cm, a conical bottom and a reserved hole at the upper end.

In the anchoring structure of the landfill liner cushion layer using rice husk ash concrete, the thickness of the rice husk ash concrete anchoring shell is 120 mm.

The invention has the following embodiment.

The anchoring structure of the landfill liner cushion layer of using rice husk ash concrete provided by the invention can adopt factory prefabrication, field assembly construction, and standardized manufacturing of the anchoring shell and the concrete anchor pile, so that the working efficiency can be improved, the construction period can be shortened, and the problems of large workload, long construction period, difficult maintenance and reinforcement and the like of the traditional groove anchoring system can be solved on the premise of meeting the anchoring technical requirements. In addition, the anchoring structure of the liner cushion layer of the landfill using rice husk ash concrete has the function of collecting, guiding and discharging leachate besides the anchoring function, which can improve the leachate treatment efficiency of the landfilU504723 and make the overall layout of the landfill more scientific, reasonable, safe and reliable.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a schematic diagram of the anchoring structure of the landfill liner cushion layer using rice husk ash concrete;

Fig. 2 is a detailed view of rice husk ash concrete anchorage shell. 1. slope; 2. impervious membrane; 3. geotextile layer; 4. intermediate platform; 5. rice husk ash concrete anchorage shell; 6. expansion bolt; 7. rubber gasket; 8. concrete anchor pile; 9. perforated PVC pipe; 10. rice husk ash concrete filler; 11. gravel

DESCRIPTION OF THE INVENTION

The invention will be further described with reference to the attached drawings: As shown in Figure 1, a trench is excavated at the top of the slope or at the middle platform, a prefabricated concrete anchor pile is driven at the bottom of the trench, and then the rice husk ash concrete anchor shell is fixed at the upper end of the concrete anchor pile through expansion bolts and rubber gaskets. The grooves on both sides of the anchorage shell are backfilled until the top surface is flat. Fold the lower geotextile, anti-seepage geomembrane and upper geotextile of the liner cushion layer in turn in the rice husk ash concrete anchorage shell, then place the perforated PVC pipe at the upper part in the lower part of the anchorage shell, pour rice husk ash concrete filler around it, and fill the upper part with gravel after it is cured.

As shown in Figure 2, the anchor shell is made of rice husk ash concrete, which has the advantages of light weight and low cost. The cross section is trapezoidal, narrow at the top and wide at the bottom. The bottom of the anchorage shell is 1100mm wide and 900m high, and the liner cushion layer is fixed by pouring rice husk ash concrete filler inside.

The bottom of the rice husk ash concrete anchorage shell is provided with a grooveU504723 which provides space for the bolt cap of the expansion bolt, keeps the bottom surface of the anchorage shell flat and free from protrusions, and does not affect the installation of the anchorage body.

PVC pipe has good tensile and compressive strength, smooth wall, little resistance to fluid, and its roughness coefficient is only 0.009, and its water conveyance capacity is 20% higher than that of cast iron pipe with the same diameter and 40% higher than that of concrete pipe. PVC water pipes have excellent acid resistance, alkali resistance and corrosion resistance, and are not affected by moisture and soil pH, and do not need any anti-corrosion treatment when laying. The upper part of PVC pipes is perforated to facilitate the inflow of leachate. The particle size range of the gravel filled in the upper part is 5-30 mm, and it is arranged according to the principle of fine bottom and thick top, which plays a filtering role in the inflow of leachate and prevents the PVC pipe from being blocked for a long time. Leachate is pumped out at appropriate locations and concentrated for purification.

The concrete anchor pile is 1.5m long and 25cm in diameter. The bottom is tapered to facilitate construction piling, and the upper end is provided with reserved holes to facilitate the insertion of expansion bolts. The longitudinal row spacing of concrete anchor piles along the anchorage shell can be determined according to factors such as the stress on the cushion layer.

The above is only the preferred embodiment of the present invention. For those skilled in the art, several improvements and embellishments can be made without departing from the principle of the invention, and these improvements and embellishments should also be regarded as the protection scope of the invention.

Claims

CLAIMS LU504723

1. An anchoring structure of a landfill liner cushion layer using rice husk ash concrete, characterized in that the structure is arranged on the slope (1) of landfill and comprises a cushion layer covering the slope (1); the cushion layer comprises a middle impervious membrane (2) and geotextile layers (3) at two sides; the middle section of the slope (1) is provided with an intermediate platform (4); the middle platform (4) is buried with a rice husk ash concrete anchoring shell (5); the liner cushion layer is folded into the rice husk ash concrete anchoring shell (5) and attached to the inner wall; the rice husk ash concrete anchoring shell (5) has a trapezoidal cross section, the bottom corner is rounded, and the top is provided with an edge parallel to the middle platform (4); a perforated PVC pipe (9) is arranged in the rice husk ash concrete anchoring shell (5); rice husk ash concrete filler (10) is poured around the perforated PVC pipe, and gravel (11) is filled at the upper part until the middle platform (4) is flush; a vertical concrete anchor pile (8) is arranged at the bottom of the pit for placing the rice husk ash concrete anchor shell (5); the rice husk ash concrete anchor shell (5) is fixed on the top end of the concrete anchor pile (8) through an expansion bolt (6) and a rubber gasket (7).

2. The anchoring structure of the landfill liner cushion layer using rice husk ash concrete according to claim 1, characterized in that the rice husk ash concrete anchor shell (5) is narrow at the top and wide at the bottom, with a bottom width of 1100mm and a height of 900mm; the bottom is provided with a groove to provide space for the bolt cap of the expansion bolt (6), and a steel mesh is arranged inside.

3. The anchoring structure of the landfill liner cushion layer using rice husk agh504723 concrete according to claim 1, characterized in that the perforated PVC pipe (9) has an inner diameter of 600mm and a wall thickness of 20mm, and the wall is provided with holes.

4. The anchoring structure of the landfill liner cushion layer using rice husk ash concrete according to claim 1, characterized in that the gravel (11) has a particle size range of 5-30 mm and is arranged according to the principle of fine bottom and thick top.

5. The anchoring structure of the landfill liner cushion layer using rice husk ash concrete according to claim 1, characterized in that concrete anchor pile (8) has a length of 1.5 m, a diameter of 25 cm, a conical bottom and a reserved hole at the upper end.

6. The anchoring structure of the landfill liner cushion layer using rice husk ash concrete according to claim 1, characterized in that the thickness of the rice husk ash concrete anchoring shell (5) is 120 mm.