Method of Improving Mechanical Performance of Integral Abutment Support Pile Using H-type Concrete Pile

Abstract

The invention relates to a method for improving integral type seamless bridge and bridge abutment pile foundation stress performance by an H-shaped concrete pile, and belongs to the field of bridges. The method comprises the following steps that (1) a sustaining pile is simulated through a finite element software and compared with an experiment pile, under the condition that the sustaining pile is in accordance with the experiment pile, the section of the sustaining is designed to an H-shaped section which enables a pile body to have optimal stress performance, and the strong axis and the weak axis of the H-shaped section are clear; (2) concrete with super high toughness is prepared; (3) moulding and bar laying are carried out, a concrete sustaining pile with super high toughness is divided into multiple units to be prefabricated, the end section of each unit is in a rectangular shape, and the middle section of each unit is in an H shape; (4) the multiple units are connected into a whole through connecting steel plates and bolts, the connecting position gradually changes from the solid rectangular section segment to the H-shaped section segment, and multiple threaded rods stretches out and at least stretches into the one fourth position of the next unit; (5) multiple threaded shearing nails are arranged on the pile head of the sustaining pile, and cast-in-place is carried out on the whole bridge abutment. The method can effectively reduce the horizontal anti-thrust rigidity of the pile, significantly increase the durability of the pile, and save the high maintenance cost.

Description

technical field [0001] The invention relates to a method for improving the mechanical performance of an integral seamless bridge abutment pile foundation by using an H-shaped ultra-high toughness concrete pile, which can be used to support the integral seamless bridge abutment and belongs to the field of bridges. Background technique [0002] The domestic and foreign research results on the supporting piles of integral bridge abutments mainly focus on the analysis and calculation methods of ordinary piles under the action of conventional loads (such as temperature and other deformations), such as prefabricated prestressed concrete piles and H-shaped steel piles. etc. These studies paved the way for its rational design and construction under normal service loads. Because the integral seamless abutment bridge can not only save expensive bearings, save the cost of maintenance and replacement of bearings, but also has good integrity and seismic performance, which can effectively...

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problems that ordinary concrete support piles have large horizontal thrust resistance stiffness, and when the integral abutment produces large longitudinal displacement under the action of temperature difference and load, cracks appear in the pile body or even the steel bars corrode, which eventually leads to failure of the bridge. A method for improving the mechanical performance of integral abutment support piles by using H-shaped concrete piles, which is convenient in design and construction, can effectively reduce the horizontal thrust stiffness of piles, significantly increase the durability of piles, and save high cost maintainance fee

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