Trimming and welding method for HDPE membrane for high-curvature side slope

Abstract

The invention discloses a trimming and welding method for an HDPE membrane for a high-curvature side slope. The trimming and welding method comprises the following steps of a, determining a midpoint trimmed line which passes through the midpoint of the longitudinal edge of the HDPE membrane and is parallel to a slope line; b, setting the midpoint trimmed line as an actual trimmed line after the midpoint trimmed line horizontally moves towards the central direction of the HDPE membrane for an offset distance, wherein the actual trimmed line passes through the longitudinal edge of the HDPE membrane; c, trimming the HDPE membrane along the actual trimmed line, trimming a trimmed membrane, and retaining the left membrane on the side slope; d, rotating the trimmed membrane for 180 DEG to ensure that an untrimmed longitudinal edge II of the trimmed membrane is overlapped on an untrimmed longitudinal edge I of the left membrane, a trimmed longitudinal edge II of the trimmed membrane aligns to a trimmed longitudinal edge I of the left membrane, and meanwhile a horizontal edge II of the trimmed membrane aligns to a horizontal edge I, connected with the untrimmed longitudinal edge I, of the left membrane; and e, welding. An integrated longitudinal edge parallel to the slope line is formed after the left membrane and the trimmed membrane are welded together, so that a laying included angle is eliminated.

Description

technical field [0001] The invention relates to the field of laying HDPE films in landfills, in particular to a method for cutting and splicing HDPE films on large curvature slopes. Background technique [0002] Most of the landfills in the southern region are valley-shaped, and they are built along the mountains. The reservoir area is often built on the basis of the mountain by using the existing mountain shape through simple surface cleaning and slope repair. The completed landfill reservoir basically maintains the original mountain shape. Topography and landform, the reservoir basin presents a conical shape with a wide upper mouth and a narrow bottom, but several levels of platforms are built on the slope for anchoring anti-seepage materials. Such as figure 1 Shown is a schematic plan view of a typical valley-type landfill 100. It can be seen from the figure that due to the alternating landform characteristics of the original mountain ridges and depressions, the anchorag...

AI Technical Summary

Problems solved by technology

[0005] (1) During the anti-seepage construction of the valley-type landfill, due to the limitation of terrain conditions, the transportation of anti-seepage materials often cannot use machinery and has to rely on low-efficiency manual transportation, which is expensive

The remaining membranes trimmed at the angle of laying will be transferred out of the off-site storage yard, which will increase additional transshipment procedures and construction costs

[0006] (2) In the irregularly curved terrain, it is difficult to match the cut diaphragm to a reusable part with the same specification due to the difference in the length of the diaphragm and the included angle θ of the diaphragm, and it can only be applied after further trimming Part of the material will be wasted if it is cut to a smaller size; and if the cut membrane is small in size, it will be difficult to reuse and become waste scraps, resulting in a waste of all materials

The construction procedure is complicated, laborious and laborious, increasing the construction cost

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