Polyurethane grouting micro-pile with pile bag and its construction method and application method

Abstract

The invention discloses a polyurethane grouting micropile with a pile bag as well as a construction method and an application method of the polyurethane grouting micropile. The polyurethane grouting micropile is characterized by comprising an outer grouting pipe, the flexible pile bag arranged on the outer grouting pipe in a sleeving manner, and polyurethane foams filled in the outer grouting pipe and the flexible pile bag, wherein a bag opening of the flexible pile bag is hermetically connected with the outer wall at one end of the outer grouting pipe. The micropile has the advantages of high single pile bearing capacity, good foundation embedding and fixing capability, simplicity and quickness for construction, controllable pile shape and diameter, low grout consumption, short working period and no quality accidents of diameter reduction and pile breakage.

Description

technical field [0001] The invention belongs to the technical field of foundation reinforcement and deviation correction, and in particular relates to a polyurethane grouting miniature pile with a pile bag and a construction method and an application method thereof. Background technique [0002] For buildings and structures built on weak foundations, if effective foundation treatment measures are not considered or taken during the design or construction phase, large-area land subsidence will easily occur after completion. If the foundation soil is weak and uneven, excessive differential settlement will occur. Cracks are generated in the building structure, which endangers the safety of the structure. [0003] Micropile is a new type of pile with the characteristics of high bearing capacity, fast construction, and flexible layout. It is widely used in reinforcement projects such as reconstruction and correction of buildings, flood control dams, tower foundations, and slopes. ...

AI Technical Summary

Problems solved by technology

[0006] (1) The flower tube cement grouting pile method uses cement as the grouting material. The cement particle size is large and there are many coarse particles. The maximum particle size can reach 90-100 μm. When the water ash is relatively large, the stability of the slurry is poor and it is easy to separate. Thickening back, unable to effectively pour into fine cracks;

[0007] (2) The construction equipment of flower tube cement grouting pile method is relatively large. Since cement is a granular material, the diameter of the hole is relatively large, and the disturbance to the existing buildings is relatively large;

[0008] (3) When the flower tube cement grouting pile method is hardened, the pile body is hardened, and the solid phase volume shrinks, which reduces the bonding strength between the hardened stone and the irrigated foundation, and reduces the bearing capacity of the foundation;

[0009] (4) The grouting range of flower tube cement grouting into pile method is uncontrollable. For example, in the fill with large pores, the penetration radius is large, which will easily cause waste of cement grout;

[0010] (5) The flower tube cement grouting pile method mainly adjusts the grouting pressure of the high-pressure cement pump, and cannot control the diameter, influence range, and shape of the pile body;

[0011] (6) The grouting piles need a certain amount of curing time to form strength, and the reinforcement areas of buildings need to be closed for construction, which will have a certain impact on production and operation activities

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