Prestressed pipe pile construction method under boulder group geological conditions

Abstract

The invention relates to a pipe pile construction method, in particular to a prestressed pipe pile construction method under boulder group geological conditions. According to the method, a down-the-hole hammer drilling process is adopted for guide hole construction; during pile sinking construction, first cement mortar is poured in a pile hole, and then a static pile driver is utilized to press a pipe pile into the pile hole; during pile head fixing construction, a #-shaped fixing frame formed by connecting fasteners is utilized to fix a pile head through a steel pipe at the position of an orifice of the pile hole, a splayed steel pipe is adopted to support two ends of the #-shaped fixing frame, the lower end of the steel pipe is embedded in a soil layer; and after the cement mortar is hardened and is integrated with surrounding rock stratums and the pipe pile, prestressed pipe pile construction is finished. According to the prestressed pipe pile construction method, a hole forming speed is quick, a construction period is short, and construction cost can be reduced by over 10%; by adopting a mode of pouring the cement mortar in the guide hole, pipe pile side pressure, end bearing capacity and the position of the pile side can be guaranteed, and side-direction stress safety of the pipe pile can be guaranteed; a pile head fixing head is simple, construction is convenient, verticality of the pipe pile is guaranteed, and bearing capacity of the prestressed pipe pile is also effectively improved.

Description

technical field [0001] The invention relates to a construction method for pipe piles, in particular to a construction method for prestressed pipe piles under the geological conditions of boulder groups. Background technique [0002] At present, the pilot holes in pipe pile construction generally use equipment such as rotary drilling rigs, impact hammers, reverse circulation drilling rigs, full casing and full rotary drilling rigs, etc. These equipments have problems of fast wear of drilling tools, easy fracture of drill pipes, and serious mud pollution to varying degrees. , construction quality is not guaranteed, etc., and for the lead holes under the geological conditions of the boulder group, the above-mentioned equipment has the problem of slow hole forming speed or even difficulty in completing the lead holes; in the pile sinking and pile fixing construction, due to the diameter of the lead hole It is larger than the diameter of the pipe pile, and the depth of the pilot ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the above-mentioned problems existing in the construction of pipe piles under the geological conditions of existing boulder groups, and provides a method for fast hole formation, saving construction costs, ensuring the bearing capacity of pipe piles, and preventing pile heads from being displaced due to horizontal forces. Construction method of prestressed pipe piles under the geological conditions of isolated boulder groups

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