Extrusion formed precast pile stiffness core and cement soil combined Y-shaped pile and construction method thereof

Abstract

The invention relates to an extrusion formed precast pile stiffness core and cement soil combined Y-shaped pile. The Y-shaped pile is composed of an external cement soil cladding, a precast core pile and a precast end-open pile tip, wherein the cross section of the external cement soil cladding is Y-shaped and is formed through enclosing of a steel immersed tube in a constraint mode, the external cement soil cladding is coated with geotechnical cloth bags, and the precast core pile presses downwards perpendicularly along the center of the steel immersed tube and is embedded into a precast hollow pile tip. Back extrusion initial set type cement soil is shaped by means of the Y-shaped steel immersed tube, stability of forming of the Y-shaped pile is guaranteed, the precast core pile is inserted in the center, the advantages that the frictional resistance of the special-shaped pile side is large and the bearing capacity of the stiffness core composite pile is high are fully utilized, and technological and economical efficiency is high. The invention further discloses a construction method of the Y-shaped pile.

Description

technical field [0001] The invention relates to a cement-soil composite pile with a strong core and a construction method thereof, in particular to an extruded prefabricated pile with a cement-soil Y-shaped core with a strong core and a construction method. It belongs to the field of foundation treatment and is suitable for foundation treatment projects in soft soil areas and tall buildings. Background technique [0002] The requirements for foundation construction in the city are getting higher and higher. Not only does it require high cost performance, but also the environmental protection requirements of the pile-forming process are getting higher and higher. The existing pile-forming process is mostly cast-in-situ pile and prefabricated pile construction. The bored cast-in-place pile has high bearing capacity and good mechanical properties, but the bored cast-in-situ pile has the disadvantages of high cost, long construction time, slow construction speed, and environment...

AI Technical Summary

Problems solved by technology

However, the formation of cement soil by high-pressure rotary jet grouting method also has certain instability, which is mainly reflected in: the drilling or rotation speed of construction machinery, and the control of cement slurry supply speed need to be adjusted according to local conditions, otherwise it is easy to cause insufficient or insufficient cement content. Uniformity, resulting in broken piles or shortage; the lower soil is solid and the range of rotary spraying is insufficient, so that the diameter of the piles is insufficient, and the effect of reinforcing the soil is reduced

[0005] To sum up, there are various forms of foundation treatment, and the traditional pile foundation construction methods have their own advantages and disadvantages. The application of new technologies has achieved great construction benefits, but they also have their own construction difficulties and limitations, such as: Y-shaped sinking pipe grouting piles The side friction resistance is relatively large and the load-bearing performance is excellent, but the soil squeezing effect is obvious, and the weak area is easy to break and fail. shape, less friction on the opposite side

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