Method for grouting and wall protection of a soft stratum pile foundation through steel casing

Abstract

The invention belongs to the technical field of constructional engineering, and relates to a method for grouting and wall protection of a soft stratum pile foundation through a steel casing. The method for grouting and wall protection of the soft stratum pile foundation through the steel casing comprises the steps that grouting pipes are arranged on the outer wall of the machined steel casing at equal intervals in the circumferential direction, and a plurality of layers of upper and lower grout overflowing holes are formed in each grouting pipe; after the steel casing provided with the grouting pipes is installed on a hard plastic stratum, grout is pressed and injected into a top grouting opening, the grouting pressure is adjusted according to the thickness of a soft stratum, grout with acertain thickness is pressed and grouted according to the wall of a grouting hole, and the grout flows out of a bottom grout outlet at first and then flows out of all layers of grout overflowing holesin sequence from bottom to top; after grouting is completed, the steel casing is pulled out, the pulling-out process is slowly carried out, the gap of the steel casing is filled with grout in a supplementing manner till the steel casing is completely pulled out, and a grout protection wall with certain strength is formed after the grout at the position of the original steel casing reaches the strength; and then pile foundation construction is conducted according to a conventional pile foundation. The construction cost is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a method for grouting a steel casing to protect a wall of a pile foundation in a weak stratum. Background technique [0002] my country's coastal areas, especially the Yangtze River Delta lacustrine plains, have complex geology, mainly composed of soft plastic clay, silt and fine sand, and fine sand formations, with wide divisions and large thicknesses, and the development of water areas is extremely common; under such geological conditions, the most conventional and economical The method is pile foundation pouring pile foundation system. In areas with particularly thick soft plastic clay, silt fine sand and fine sand stratum, piles are formed. Generally, deep steel casings are used to pass through the soft stratum and enter the hard plastic stratum to carry out hole filling of the pile foundation. In order to avoid quality defects of the deep soft plas...

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Problems solved by technology

[0002] my country's coastal areas, especially the Yangtze River Delta lacustrine plains, have complex geology, mainly composed of soft plastic clay, silt and fine sand, and fine sand formations, with wide divisions and large thicknesses, and the development of water areas is extremely common; under such geological conditions, the most conventional and economical The method is pile foundation pouring pile foundation system. In areas with particularly thick soft plastic clay, silt fine sand and fine sand stratum, piles are formed. Generally, deep steel casings are used to pass through the soft stratum and enter the hard plastic stratum to carry out hole filling of the pile foundation. In order to avoid quality defects of the deep soft plastic layer pile foundation at the top, the steel casing is generally not pulled out. After the pile foundation construction is completed, the casing is buried underground and cannot be recycled and reused. More steel is used. The steel casing is used in the construction of the pile foundation. Occupation costs are huge

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