Ground strengthened high pressure rotary spraying pile construction technique

Abstract

The invention discloses a construction technology for a high-pressure rotary churning pile for foundation stabilization, which comprises the following steps: 1. a center point of the high-pressure rotary churning pile is determined; 2. a hole is dug on the center point by adopting a hole digging machine until the hole penetrates a concrete foundation and a pond slag layer; 3. a high-injection drilling machine is arranged in place and adjusted to be stabilized, a drill bit of the high-injection drilling machine is aligned to the center point, and the angle of a drill rod is adjusted to be consistent with the designed pile inclination angle; 4. a high-pressure grouting pump of the high-injection drilling machine is opened, a drilling tool is slowly sunk for drilling a hole after the high-pressure grouting pump of the high-injection drilling machine is normally operated, and simultaneously water is delivered into the grouting hole until the designed elevation is reached; and 5. the prepared chemical serum is poured into a filtering aggregate bin, water delivery is converted into serum delivery by a high-pressure pump, and a serum delivery pump is opened for serum delivery, stands and performs spraying for 20 to 40 seconds at the bottom of the pile, and is rotated and simultaneously lifted until the designed pile top elevation is reached. Compared with the prior art, the construction technology has the advantages of suitability for various different soil qualities with hard surface layers, high construction efficiency, low cost, small equipment loss, and superiority suitable for different construction environments.

Description

technical field [0001] The invention relates to a high-pressure rotary grouting pile construction technology for foundation reinforcement in the field of foundation treatment of construction engineering. Background technique [0002] At present, the traditional high-pressure jet grouting pile construction method used for foundation reinforcement is usually to use a drilling rig to drill a grouting pipe with a nozzle to the design level of the soil layer after determining the center position of the pile, and use high-pressure equipment to make the chemical grout flow at high pressure. The form of flow is ejected from the nozzle and impacts the rotary-cut soil. At the same time, the drill pipe rotates at a certain speed and gradually lifts up at a certain speed, so that the slurry and soil particles are forcibly mixed. After the slurry is solidified, it will be in the soil. form a solid body with a certain strength. This method has the advantages of convenient construction, s...

AI Technical Summary

Problems solved by technology

However, this method uses a high-jet pile machine to directly drill down to form a hole, and the drill pipe is sunk by the self-weight of the pile machine, which is only suitable for pile formation where the surface layer is a weak soil layer.

However, in the actual construction process, there are few construction sites that meet this construction condition. The surface layer of most sites is slag layer or miscellaneous fill soil layer, which makes it difficult for the drilling rig to drill down; if it is forced to drill down, it will easily cause equipment damage. loss

Therefore, using the above method, there are disadvantages such as high equipment loss, low construction efficiency, long construction period, and even failure to construct during construction.