Digging, spraying, pressing and grouting pile and construction method and special drilling machine thereof

Abstract

The invention discloses a digging, spraying, pressing and grouting pile and a construction method and a special drilling machine thereof. The special drilling machine can scrape a soil layer around a pile body at the positions of a diameter expanding body and a wing plate on the surface of a pile hole into a cavity of the diameter expanding body with the depth of 10-20 cm and a groove of the wing plate with the depth of 10-20 cm and the width of 5-10 cm by using a scraper; cement paste which is sprayed in a rotating and fixed mode rises to the soil layer at the position of the diameter expanding body and the wing plate or rises to be filled in the cavity of the diameter expanding body or the soil layer in the groove of the wing plate which is scraped, loosened, dug and expanded by the soil scraper, and water in the cement paste permeates into the soil layer which is not loosened to soften a soil body; then high-pressure cement paste impacts and cuts in the softened soil layer in a jet mode to slump a hole wall of the cavity of the diameter expanding body or the groove of the wing plate groove scraped by the scraper, the area of the cavity of the diameter expanding body or the groove of the wing plate is thickened and deepened, concrete can be pressed into the cavity of the diameter expanding body or the groove of the wing plate to be connected with the pile body, the pile body is connected with the wing plate and the double-frustum diameter expanding body through the concrete, and the concrete is bonded with surrounding cemented soil and a compacted soil layer, so that the settlement deformation of a single pile is small, and the bearing capacity of the single pile is doubled or above.

Description

technical field [0001] The invention relates to a digging and spraying pressure grouting pile, in particular to a digging and spraying pressure grouting pile with a double-cone diameter expanding body or a wing plate on the pile body, a construction method thereof and a special drilling rig. Background technique [0002] The long auger bored grouting pile widely used at present has fast construction speed and good quality. I invented the Chinese patent with the patent number ZL201810087422.5 and the name "spray-expanded extrusion composite pile and its construction method and the spiral spray-expanded extrusion drilling rig used in this method". The pile body of the pile consists of a pile body, a double cone The pile body is composed of a platform expander and a pile end. The pile body is equipped with a double-cone-shaped expander and a wing plate perpendicular to the axis of the pile. The double-cone expander is located at the vertical position of the pile body and has a ...

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Problems solved by technology

I invented the Chinese patent with the patent number ZL201810087422.5 and the name "spray-expanded extrusion composite pile and its construction method and the spiral spray-expanded extrusion drilling rig used in this method". The pile body of the pile consists of a pile body, a double cone The pile body is composed of a platform expander and a pile end. The pile body is equipped with a double-cone-shaped expander and a wing plate perpendicular to the axis of the pile. The double-cone expander is located at the vertical position of the pile body and has a high deformation modulus and shear resistance. The strength of the soil layer position, although compared with the long auger bored pressure-grown pile, the single pile bearing capacity can be increased by 1 to 3 times under the same geological conditions, but the current "spray-expanded extrusion composite pile and its construction method and the method used When the "Spiral Spray Expansion Squeeze Drilling Rig" is used in hard soil layers, the expansion size of the pile body of the double-cone truncated diameter expander is generally 10-25cm in the clay layer, and 10-30cm in the sandy soil and silt layers. The output width and thickness are 3×10cm, and there is a problem that the expansion size of the double-cone frustum expander and the wing plate are small

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