Construction method for prefabricated tubular pile with expanding head

Abstract

The construction method of prefabricated tubular piles with enlarged heads is a method for strengthening the foundation in building foundation engineering. In the construction process, the method of forming enlarged heads at the pile ends is as follows: 1) Use the pile driving machine to place the prefabricated The pipe pile (1) and the hollow pile point (2) sink to the predetermined elevation, 2) in the prefabricated pipe pile (1), hammer down with the pressure rod (3) to make the hollow pile point (2) continue to press down, 3) Put filler (4) between the hollow pile tip (2) and the prefabricated pipe pile (1), 4) hammer down with the pressure rod (3) to expand the filler downward and around, and compact it, 5) Repeat steps 3 and 4 until the enlarged reinforcement area at the pile end is formed, and an enlarged head is formed at the pile end. The method greatly improves the bearing capacity of the pile, improves the physical and mechanical index of the soil at the pile end, avoids the softening of the soil at the pile end, and reduces the construction cost.

Description

technical field [0001] The invention relates to a method for reinforcing foundations in building foundation engineering, and belongs to the technical field of civil engineering pile foundation construction methods. Background technique [0002] In building foundation engineering, a large number of pile structures are used. Prefabricated pipe piles are the most widely used because of their advantages such as high strength, low material consumption, fast construction speed, relatively low cost, and easy quality assurance. Pipe piles are divided into prestressed pipe piles, high-strength thin-walled pipe piles and other forms. Because most of the prefabricated pipe piles are sunk into the soil by static pressure or hammering, they are all linear. In order to increase the bearing capacity of prefabricated pipe piles, there are currently a few technologies that can be used to construct the expansion head in the foundation at the bottom of the pile, but these construction methods...

AI Technical Summary

Problems solved by technology

In order to increase the bearing capacity of prefabricated pipe piles, there are currently a few technologies that can be used to construct the expansion head in the foundation at the bottom of the pile, but these construction methods either need to be filled with water to form holes, which brings difficulties to the concrete pouring, or the concrete is poured It is easy to cause damage to the prefabricated pipe pile, and the pile tip sinks very little, so it is difficult to form an enlarged head, and the quality of the project is difficult to guarantee

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