Middle and small span bridge grouting miniature steel pipe pile, pile foundation and construction methods thereof

Abstract

The invention discloses a middle and small span bridge grouting miniature steel pipe pile, a pile foundation and construction methods thereof. The pile construction method comprises the following steps of geological exploration; fixed-point drilling; hole cleaning; machining and manufacturing of a miniature steel pipe; welding of a centering frame; lowering of the miniature steel pipe and a grouting pipe; secondary hole cleaning; primary grouting; secondary grouting; and obtaining of the grouting miniature steel pipe pile with sealing and flattening. The pile foundation construction method comprises the following steps that the outer surfaces of the side walls of the pile tops are provided with a cushion layer, and group piles are connected into a whole through the cushion layer; and the outer surface of the side wall of the pile top of each pile above the cushion layer is uniformly welded with at least three reinforcing steel bars, and the reinforcing steel bars extend into a bearingplatform at at least 30 times of the diameter of the steel bars to obtain the grouting miniature steel pipe pile foundation. By combining the miniature steel pipe piles with a tunnel pipe shed grouting technology, the construction methods are simple to operate and high in pile forming quality, can solve the problems that surrounding buildings are influenced by pile body damages and static pressuretype pile pressing caused by traditional hammer type pile sinking and the like can be effectively solved and is capable of obviously improving the construction efficiency, reducing pollution and lowering the cost at the same time.

Description

technical field [0001] The invention relates to the technical field of bridge pile foundation construction, in particular to a small and medium-sized span bridge grouting miniature steel pipe pile and pile foundation and a construction method. Background technique [0002] Small and medium-sized span bridges refer to bridges with a total porous span length of 8-100m and a single-hole span within the range of 5-40m. With the vigorous development of highway traffic construction in our country, the importance of small and medium-sized bridge construction has attracted attention. Commonly used bridge foundations include enlarged foundations, bored pile foundations, and steel pipe pile foundations. When the ground conditions are complex and it is difficult to excavate construction, the traditional pile type can no longer meet the current needs. [0003] Micro steel pipe pile refers to a new type of steel pipe pile with a diameter of no more than 300mm and an aspect ratio of no l...

AI Technical Summary

Problems solved by technology

However, it does not limit the scope of use, there are many operating steps, and three special grouting processes are required. There is no indication of the operation after the steel pipe pile is poured, and the construction process is incomplete.

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