High-pressure jet grouting pile is to inject cement slurry into the soil layer by using high-pressure rotary nozzle and mix it with soil to form continuous overlapping cement and solid. The construction occupies less land, has little vibration and low noise, but it is easy to pollute the environment and has high cost, so it is not suitable for special soil that cannot be solidified by shotcrete.
According to the characteristics of engineering geology, in order to ensure the pile quality, it is necessary to choose high-power drilling rig and supporting fixture with strong clamping ability. According to geological conditions, single pipe method and double pipe method can be selected, which are suitable for construction in silty soil and muddy soil respectively.
The equipment of high-pressure jet grouting pile can be simply divided into: geological pore-forming equipment, stirring pulping equipment, gas supply, water supply and slurry supply equipment.
In the process of pile test construction, the phenomenon of "drilling" often occurs because of the strong adsorption of the mud layer on the drill pipe, and the pile test construction cannot be carried out smoothly. Aiming at the phenomenon of "drilling", the contact surface between drilling rig fixture and drill pipe is treated, and the contact surface is set into a strip to prevent the drill pipe from slipping off the fixture; Using double pipe construction, the surface of drill pipe can be wrapped with airflow, and an airflow isolation layer is formed between silt and drill pipe, which reduces the adsorption force of soil layer and prevents the phenomenon of "drilling".
The preparation of construction equipment plays a very important role in the whole construction process.
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