Method for manufacturing a PHC tubular pile in soft soil region through chambering and grouting

Abstract

The invention provides a method for manufacturing a PHC tubular pile in a soft soil region by chambering and grouting. The method comprises the following steps that: the pile end at the base of the PHC tubular pile sunken in construction is provided with an enlarged head plate; the enlarged head plate is subjected to chambering to form a square, circular, triangular or elliptical gap in the construction process; in the pile sinking process, grout, cement mortar or residual grout scrap is filled in the gap; the grouting materials achieve the function of protecting the wall in the pile sinking process; and after being solidified, the grouting materials can increase the resistance of the pile end and the frictional resistance of the pile side and improve the interaction between the pile and soil. The method has the effect of providing the simple method for improving the compression resistance, pulling resistance and horizontal force resistance of the PHC tubular pile in the soft soil region, fully exerts the strength of a tubular pile body, can reduce the friction of the soil on the pile body in the pile sinking process, protects an anticorrosive dope, has the action of seepage protection on cracks of the pile body, improves the impermeable effect; and the strength of the grouting materials after being solidified reaches between 3 and 15 MPa. With the method, the bearing capacityof the PHC tubular pile can be improved to 150 to 300 percent; the comprehensive construction cost can be saved by 20 to 60 percent; and the social economic benefit is improved.

Description

technical field [0001] The invention relates to the technical field of foundation in civil engineering, in particular to a method of forming pores around high-strength prestressed pipe piles by means of reaming. The formed high bearing capacity, high pullout resistance, high horizontal force resistance and good anti-seepage effect are a method for making a reaming grouting PHC pipe pile in a soft soil area. Background technique [0002] With the development of social economy, pretensioned high-strength prestressed concrete pipe piles (referred to as PHC pipe piles) are a commonly used pile type, as shown in Figure 1. In 2008, the national annual output has exceeded 300 million meters, and it has been widely used in various buildings. PHC pipe piles have the advantages of high strength, economy, and fast construction period. The strength of the pile body can reach 80MPa, which is much higher than other foundation piles. The bearing capacity of the pile takes the lower value...

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Problems solved by technology

Although such things have a certain effect, they often require a variety of equipment matching combinations, the construction process is complicated and the construction efficiency is low, and it is difficult to obtain better social and economic benefits.

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