High pressure jet grout pump
High pressure jet grout pump can be used for a variety of applications, such as ground improvement, soil stabilization, and concrete repair. Jet grouting involves using a high-pressure pump to inject grout into the soil to create columns or walls of grout. This technique can be used to stabilize soils, create underground barriers, and repair concrete structures by filling voids and cracks.
The high-pressure rotary spraying method of high-pressure jet grout pump uses a drilling rig to drill a grouting pipe with a nozzle into a predetermined position in the soil layer so that the slurry or water and (air) form a high-pressure jet of 20-40 MPa from the nozzle to perforate, disturb and damage the soil. At the same time, the drill pipe is gradually raised at a certain speed, forcing the mud to mix with the soil particles. After the grout is solidified, a cylindrical consolidation body (that is, the jet grouting pile) is formed in the soil to achieve the purpose of strengthening the foundation or preventing water seepage.
According to different injection methods, injection grouting of high-pressure jet grout pumps can be divided into the single-pipe methods, double-pipe methods, and three-pipe methods.
1. Single-pipe method: single-layer injection pipe, only cement slurry is injected.
2. Double-pipe grouting method: also known as grouting and gas injection method, it uses double-pipe grouting to simultaneously inject high-pressure cement slurry and air two medium jets into horizontal jets to impact and destroy the soil. Under the combined action of the high-pressure mud and the airflow around the outer ring, the energy of the damaged soil increases significantly, and finally, a large consolidated body is formed in the soil.3. The three-pipe method is a method of grouting, water injection, and gas injection, which uses triple grouting pipes to transport water, gas, and slurry respectively. The cylindrical airflow is surrounded by high-pressure water generated by high-pressure generators such as high-pressure pumps, and high-pressure water jets and air coaxial jets cut the soil to form larger gaps. The cement slurry is then injected at low pressure into the cut and broken foundation with a slurry pump. The nozzle rotates and lifts, so that the cement slurry mixes with the soil, solidifies in the soil, and forms a large consolidated body. The solidification diameter can reach 2m.
