Diameter-expanding concrete pipe pile, diameter-expanding device, and diameter-expanding method

Abstract

The invention discloses an expanding concrete tubular pile as well as an expanding device and an expanding method. The expanding concrete tubular pile is formed by a concrete tubular pile, a built-in belt, a small round hole, a check valve, an injection pipe, a pressure air pipe, a rubber air upper chamber, a rubber air lower chamber, a rubber air upper chamber air hole, a rubber air lower chamber air hole, a slurry outlet hole, a concrete tubular pipe expanding annular belt, a check valve end, a rubber pad, a guide rod, a tension spring, rectangular sectional ring, a support rod, an elastic barb, a connecting rod and a spring hanging ring. The expanding concrete tubular pile as well as the expanding device and the expanding method disclosed by the invention are scientific and reasonable, simple in structure and convenient in construction, can thoroughly solve the difficulty of expanding of prefabricated concrete tubular piles with relative low cost, and can greatly improve the bearing capacity of the concrete tubular piles, thus providing technical guarantee for wide application of the concrete tubular piles.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a string-shaped diameter-expanding concrete pipe pile, a diameter-expanding device and a diameter-expanding method. Background technique [0002] Pile foundation is one of the important components of buildings and structures. At present, the commonly used foundation piles can be divided into two categories: prefabricated piles and cast-in-place piles according to the form of piles. Among them, prefabricated piles include steel pipe piles, precast concrete piles, precast concrete pipe piles, etc. The advantages are that the pile making process is factory construction, the construction speed is fast, and the pollution to the environment is small. The prefabricated piles are driven or pressed into the soil by machinery, and the joint action of the piles and the soil is used to provide compression, pullout, bending or horizontal bearing capacity. Cast-in-situ piles include bored cas...

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Problems solved by technology

Compared with cast-in-situ piles, concrete pipe piles have the advantages of fast construction speed, low cost, high pile body strength, and easy control of construction quality, and have been widely used in various fields of civil engineering. Previously, the shape of the pile body has been determined, and it is difficult to expand the diameter of the concrete pipe pile. Although some patented technologies have tried hard in this regard, there has been no substantial progress, such as CN 102191772 A prefabricated reaming pile and its construction method, only in Two narrow wings protrude from the pile end of the cross-section pile, and the effect is very small; CN 203475423 U is a kind of prestressed high-strength concrete pipe pile with a static pressure enlarged head. The frictional resistance of the circle is completely lost, and the total bearing capacity of the general formation not only does not increase but decreases

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