Method for laying ore pulp pipelines in quicksand bed section

Abstract

The invention relates to laying of large-calibre long-distance transportation pipelines for pulp and provides a method for laying ore pulp pipelines in a quicksand bed section. Pipe ditches are excavated by sections. The method comprises the following steps of: (1) arranging sealing structures to block excavated pipe ditches and pipe ditches to be excavated; (2) excavating the pipe ditches to be excavated, injecting water into the excavated ditches at the same time until completion; (3) sealing both ends of each pipeline, and moving the pipelines to the pipe ditches so that the pipelines float on water surface; (4) injecting water into the pipelines or pressing the pipelines to the bottom of the ditches through a counterweight; and (5) backfilling the ditches. Quick sands are prevented from flowing into the ditches by using the osmotic pressure of water, the surrounding sand bed is extruded and compacted through osmotic pressure to avoid the collapse of ditch walls and the land subsidence of pipeline ditch edges, and the pipeline ditches are convenient to form. After backfilling, most of injected water penetrates into ground, and the rest of injected water is extruded back to ground surface due to backfilling. Therefore, construction is convenient and quick, and the construction cost is low. The method provided by the invention is applicable to the laying of ore pulp pipelinesin the quick sand bed section.

Description

technical field [0001] The invention relates to the laying of large-diameter and long-distance transmission pipelines for slurry, in particular to a method for laying slurry pipelines in quicksand layers. Background technique [0002] Large-diameter, long-distance slurry pipelines are widely used in ore transportation, especially in remote mines. Slurry pipelines are arranged according to the terrain and terrain, and strive to be straight to reduce the length of the line and avoid too many turns. The line selection should avoid passing through areas with excessive terrain fluctuations, and minimize the number of pumping stations and the generation of accelerated flow; the line should be as far as possible Avoid landslides, collapses, subsidence, debris flows, swamps, quicksand and other geologically bad areas, active fault zones and densely populated areas in areas with seismic intensity greater than seven degrees. However, no matter whether it is to use the surface surface...

AI Technical Summary

Problems solved by technology

Due to the vast area of ​​the large-diameter long-distance pipe slurry channel, the cost of using the above-mentioned deep-layer mixing pile and high-pressure rotary grouting pile is too high