Long spiral double-pipe high-pressure stir-jet grouting pile construction method and device

Abstract

The invention relates to a long spiral double-pipe high-pressure stir-jet grouting pile construction method and a long spiral double-pipe high-pressure stir-jet grouting pile construction device. The method comprises the following steps of: according to the design requirements, determining the position of each pile, and drilling while jetting water at the high speed to form a slurry retaining wall, or jetting cement slurry when necessary; or directly drilling; and lifting the drill by adopting jet grouting, directional jet grouting or swing-jet grouting technology to perform stir-jet grouting until a pile is formed. The long spiral double-pipe high-pressure stir-jet grouting pile device comprises a hollow drill stem, a high-pressure slurry conveying pipe, a high-pressure water pipe, a stirring blade, a double-pipe jet grouting stirring drill, a double-pipe rotary grouting joint, a cement slurry conveying pipe, a high-pressure water conveying pipe, a high-pressure cement grouting pump, a high-pressure water pump and the like. Compared with the conventional stirring pile and stir-jet grouting pile, the long spiral double-pipe high-pressure stir-jetting pile device is suitable for not only mollisol, loose or slightly compact sandy soil, but also various soil layers, such as stiff clay, sandy gravel, muck and the like, and particularly has more obvious effect in the sandy gravel.

Description

Technical field: [0001] The invention relates to a new construction method and device for high-pressure jet-stirred cement-soil piles in construction engineering. It is mainly used for water-stop curtain and foundation treatment projects, and is suitable for construction in various soil layers, especially in humus soils. It is more advantageous in strata such as hard clay, sandy soil and gravel soil. Background technique: [0002] Although the water-cutting curtain technology and equipment formed based on ordinary rotary grouting piles and mixing piles have been widely used in foundation pit water-stop projects, they are not suitable for use in humus soil, hard clay, medium-dense to dense sandy soil, and pebble formations. Due to the limitations, such as the problems of not being able to stir or spray, or the formed piles being thicker and thinner at the bottom, adjacent piles piercing the crotch, or uneven quality, the water-cutting curtain piles have water leakage. [000...

AI Technical Summary

Problems solved by technology

[0004] 1. Single-weight pipes are used for construction, and the diameter of the pile is limited. In addition, the verticality of the construction of the long auger drilling machine is not well controlled, especially in the sand and pebble layer. According to the effect of excavation, some curtain piles and slope protection The pile body deviates greatly, thus forming a leakage gap in the same direction, the curtain water-stop effect is not very ideal, and water leakage occurs frequently;

[0005] 2. During the rotary spraying process, the lifting or lowering speed of the drilling rig does not match the rotary spraying speed. If the lifting speed is too fast, it is easy to form a threaded curtain pile, and the connected threads should form a leaking channel;

[0006] Although the drilling or hoisting speed of the drilling rig is controlled by adjusting the pulley block, one is that there are too many pulley blocks after the improvement, which is easy to fall off, and the maintenance time after falling off is long, which should cause buried drilling accidents; Only rotary grouting pile construction can be carried out), and other drilling rigs are still needed to assist in leading the holes, the construction efficiency is low, resulting in waste of resources and high construction costs

Images