2results about How to "Increase the grouting pressure" patented technology

The application relates to a deep-water pebble covering layer buried type lock steel pipe pile cofferdam water stop construction method, a steel casing is first inserted and driven at a designed insertion and driving position of a steel pipe pile, the steel pipe pile is inserted and driven to a rock layer below a pebble covering layer, a large-diameter steel pipe pile hole is formed, then clay is backfilled in the steel casing, and the steel casing is pulled out; a plurality of slurry outlet holes are formed on a pipe wall of a lower end of the steel pipe pile in advance, the steel pipe pile is inserted into the pile hole, clay in the steel pipe pile is removed, a grouting device is placed in the steel pipe pile, the grouting device forms a closed space in the steel pipe pile, cement slurry is pressed into the steel pipe pile through the grouting device, the cement slurry is pressed into a space between the steel pipe pile and the rock layer through the slurry outlet holes on the steel pipe pile under high pressure, the steel pipe pile is firmly combined with the rock layer, the steel pipe pile can be kept stable under the action of water flow impact, water outside the cofferdam can be prevented from penetrating into the cofferdam from the space between the steel pipe pile and the rock layer, and therefore the water stop effect of the cofferdam is improved.

The present application relates to the technical field of goaf treatment, and particularly relates to a coal mine goaf treatment system and method. The technical scheme comprises a roadway mold and a U-shaped steel plate for supporting the inner wall of the roadway, the roadway mold is provided with a connecting device for the U-shaped steel plate, one side of the roadway mold is provided in an open manner, and an arc-shaped discharging groove is formed in the top of the roadway mold. The present application can uniformly distribute the slurry, increase the grouting pressure by extruding the slurry, increase the slurry diffusion range, improve the grouting reinforcement effect, effectively eliminate the bubbles in the grouting slurry by extruding the slurry, improve the compactness of the grouting, realize the automatic pouring of the concrete roadway and the support of the concrete roadway, integrate the concrete roadway pouring, grouting reinforcement and support, greatly improve the efficiency of the concrete roadway pouring and the support efficiency, improve the goaf treatment efficiency, and do not need manual operation and support erection for the roadway, and the degree of automation is high.