CN109469056B - Sanitary landfill liner layer assembled anchoring structure - Google Patents

Abstract

The invention relates to a new assembled anchoring structure for the liner layer of a sanitary landfill, and belongs to the technical field of environmental protection. A liner layer is provided on the slope of the landfill. The liner layer is specifically an anti-seepage membrane in the middle and geotextiles on both sides. A fiberglass anchor shell is provided at the top of the slope or at the middle platform. Through prefabricated The concrete pile is fixed in the anchoring trench, the liner layer is folded in the fiberglass anchor shell, and the anchor is inserted laterally for fixation. The fiberglass anchor is trapezoidal, with a perforated partition in the middle and gravel on the upper part. The anchoring structure adopts prefabricated construction, and the components can be standardized and has the function of collecting and guiding leachate.

Description

Sanitary landfill liner assembly anchoring structure

Technical field

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

Background technique

With the development of the national economy and the improvement of urbanization level, the generation of municipal solid waste is increasing rapidly. There are three main final disposal methods for municipal solid waste: sanitary landfill, composting and incineration. Among them, sanitary landfill is currently the most commonly used waste disposal technology in the world. It is based on scientific site selection and adopts necessary site protection treatment methods and reasonable landfill structures to minimize and eliminate the impact of garbage on the environment, especially groundwater pollution. In recent years, many cities have been building large-scale domestic waste landfills.

In urban sanitary landfills, a liner system must be installed to prevent leachate from seeping into the ground and causing groundwater contamination. During the landfill process, garbage is filled in layers and blocks. Due to the continuous accumulation and compression of garbage and the action of landfill operation vehicles, tension will be formed in the liner layer and the liner system may lose its original shape. In order to prevent this phenomenon from happening, anchoring areas are generally set up at the top of the slope or at the platform of the segmented slope.

The anchorage of the liner layer of the landfill generally adopts a trench anchor system, usually with a rectangular cross-section. The edges of the geomembrane and protective fabric are folded in the trench and fixed by pouring cement concrete. During the construction process of this traditional trench anchor system, the side walls and bottom of the trench need to be reinforced. The amount of work is large, the concrete pouring and curing period on the liner layer is long, and if the liner layer under the concrete anchor is damaged, , maintenance and reinforcement are difficult. Therefore, it has certain limitations in terms of functionality and practical performance.

Contents of the invention

Purpose of the invention: The present invention proposes a new assembled anchoring structure for the liner layer of a sanitary landfill. It can solve or improve the problems of traditional trench anchoring systems such as large workload, long construction period, and difficulty in maintenance and reinforcement.

Technical solutions:

The sanitary landfill liner layer assembled anchoring structure is characterized in that: the structure is set on the side slope of the garbage landfill; it includes a liner layer covering the side slope;

The liner layer includes an anti-seepage membrane in the middle and geotextile layers on both sides;

An intermediate platform is provided in the middle section of the slope;

A fiberglass anchor shell is buried in the middle platform; the liner layer is folded into the fiberglass anchor shell and fits the inner wall;

The fiberglass anchor shell has a trapezoidal cross-section, the bottom corners are rounded, and the top has an edge parallel to the middle platform;

There is a FRP anchor in the FRP anchor shell, and the liner layer is sandwiched between the FRP anchor shell and the FRP anchor;

A horizontal perforated partition is provided in the middle of the fiberglass anchor, and the top of the perforated partition is filled with gravel.

Vertical concrete anchor piles are provided at the bottom of the pit for placing the fiberglass anchor shell; the fiberglass anchor shell is fixed to the top of the concrete anchor pile through expansion bolts and rubber gaskets.

The fiberglass anchor shell is narrow at the top and wide at the bottom, with a bottom width of 1000mm and a height of 800mm; the bottom is provided with a groove to provide space for the expansion bolt caps and keep the bottom surface of the fiberglass anchor shell free of protrusions.

The fiberglass anchor is trapezoidal, with a bottom width of 880mm, an upper width of 600mm, and a gravel particle size range of 5 to 20mm.

Concrete anchor pile, the length of the pile is 2.5m, the diameter is 20cm, the bottom is tapered, and the upper end is equipped with a reserved hole.

The thickness of the fiberglass anchor shell is 25mm. The thickness of the fiberglass anchor is 15mm.

Advantages and effects:

The new assembled anchoring structure of the liner layer of the sanitary landfill proposed by the present invention can be prefabricated in the factory and constructed on-site, and the components are standardized, which can improve work efficiency and shorten the construction period. On the premise of meeting the anchoring technical requirements, it can solve the problems of traditional trench anchoring systems such as large engineering volume, long construction period, and difficulty in maintenance and reinforcement. In addition, the new assembled anchoring structure of the liner layer of the sanitary landfill of the present invention not only has the anchoring function, but also has the function of collecting and guiding leachate, which can improve the efficiency of leachate treatment in the landfill and make the overall layout of the landfill more scientific. Reasonable, safe and reliable.

Picture description:

Figure 1 Schematic diagram of the assembled anchoring structure of the liner layer of the sanitary landfill;

Figure 2 Detailed view of fiberglass anchor shell;

Figure 3 Detailed view of fiberglass anchor;

Marked in the picture:

1 side slope; 2 anti-seepage membrane; 3 geotextile layer; 4 intermediate platform; 5 fiberglass anchor shell; 6 expansion bolts; 7 rubber gaskets; 8 concrete anchor piles; 9 fiberglass anchors; 10 perforated partitions.

Detailed ways:

The present invention will be further described below in conjunction with the accompanying drawings: As shown in Figure 1, a trench is excavated at the top of the slope or at the middle platform, and prefabricated concrete anchor piles are driven into the bottom of the trench, and then the fiberglass anchor shell is expanded through Bolts and rubber gaskets are fixed to the upper end of the concrete anchor pile. The grooves on both sides of the anchor shell are backfilled until the top surface is level. Fold the lower geotextile, anti-seepage geomembrane, and upper geotextile of the liner material into the FRP anchor shell in sequence, install the FRP anchor through transverse insertion, and fill the perforated partitions inside the anchor with gravel.

As shown in Figures 2 and 3, the anchor shell and anchor body are both made of fiberglass, which has the advantages of high strength and corrosion resistance. The cross-section shapes of both are trapezoidal, narrow at the top and wide at the bottom. The bottom width of the anchor shell is 1000mm and the height is 800m. The bottom width of the anchor body is 880mm and the top width is 600mm. The liner layer is fixed by the tight combination of the two and the inability to rotate relative to each other.

The thickness of the fiberglass anchor shell is 25mm. The thickness of the fiberglass anchor is 15mm.

The bottom of the fiberglass anchor shell has a groove to provide space for the expansion bolt cap, keeping the inner bottom of the anchor shell flat and free of protrusions, and does not affect the installation of the anchor. A perforated partition is set in the middle of the FRP anchor, and the upper part is filled with gravel with a particle size range of 5 to 20 mm. The leachate penetrates into the anchor through the gravel layer, is pumped into the transportation pipeline at an appropriate location, and is finally purified.

The concrete anchor pile is 2.5m long and 20cm in diameter. The bottom is tapered to facilitate construction and piling, and the upper end is equipped with a reserved hole to facilitate the insertion of expansion bolts. The spacing of the longitudinal rows of concrete anchor piles along the anchor shell can be determined based on factors such as the stress on the liner layer.

Claims (4)

1. Sanitary landfill liner layer assembled anchoring structure, characterized in that: the structure is set on the slope (1) of the garbage landfill; it includes a liner layer covering the slope (1); The liner layer includes an anti-seepage membrane (2) in the middle and geotextile layers (3) on both sides; An intermediate platform (4) is provided in the middle section of the side slope (1); A fiberglass anchor shell (5) is buried in the middle platform (4); the liner layer is folded into the fiberglass anchor shell (5) and fits the inner wall; The fiberglass anchor shell (5) has a trapezoidal cross-section, the bottom corners are rounded, and the top has an edge parallel to the middle platform (4); A fiberglass anchor (9) is provided in the fiberglass anchor shell (5), and the lining layer is sandwiched between the fiberglass anchor shell (5) and the fiberglass anchor (9); A horizontal perforated partition (10) is provided at the middle position inside the fiberglass anchor (9), and gravel is filled above the perforated partition (10); Vertical concrete anchor piles (8) are provided at the bottom of the pit for placing the fiberglass anchor shell (5); the fiberglass anchor shell (5) is fixed to the concrete anchor pile (8) through expansion bolts (6) and rubber gaskets (7) )top; The fiberglass anchor shell (5) is narrow at the top and wide at the bottom, with a bottom width of 1000mm and a height of 800mm; the bottom is provided with a groove to provide space for the cap of the expansion bolt (6) to keep the internal bottom surface of the fiberglass anchor shell (5) free of protrusions; The fiberglass anchor (9) is trapezoidal, with a bottom width of 880mm, an upper width of 600mm, and a gravel particle size ranging from 5 to 20mm. 2. The sanitary landfill liner layer assembled anchoring structure according to claim 1, characterized by: concrete anchor piles (8), the length of the pile is 2.5m, the diameter is 20cm, the bottom is tapered, and the upper end is provided with a reserved hole. . 3. The sanitary landfill liner assembly-type anchoring structure according to claim 1, characterized in that: the thickness of the fiberglass anchor shell (5) is 25mm. 4. The sanitary landfill liner assembly-type anchoring structure according to claim 1, characterized in that: the thickness of the fiberglass anchor (9) is 15mm.