High-frequency vibration-punching base expansion grouting pipe pile and construction method thereof

Abstract

The invention discloses a high-frequency vibration-punching base expansion grouting pipe pile and a construction method of the high-frequency vibration-punching base expansion grouting pipe pile. A match-end-shaped rubble and concrete composite body coated with cement slurry is arranged at the lower end of a high-frequency vibration-punching base expansion grouting pipe pile body, and is formed by construction waste and the cement slurry in a condensation mode, and the average diameter of the construction waste ranges from 3 cm to 8 cm. The construction method comprises the steps that hammering and static pressing are carried out on the pipe pile according to the design requirements so that the pipe pile body can have the designed elevation, a high-frequency vibration punching device is used for carrying out vibration punching on the bottom of the pipe pile body, the bottom of the pipe pile body is filled with small-particle construction waste and the cement slurry, and the rubble and concrete composite body is formed at the lower end of the pipe pile body. The high-frequency vibration-punching base expansion grouting pipe pile has high supporting strength, and the high bearing capacity of the high-frequency vibration-punching base expansion grouting pipe pile is ensured through the rubble and concrete composite body. According to the construction method of the high-frequency vibration-punching base expansion grouting pipe pile, the high-frequency vibration-punching grouting pipe pile can effectively penetrate through a sand layer and a crust, construction efficiency is high, the construction cost is low, the single high-frequency vibration-punching base expansion grouting pipe pile is high in bearing capacity, high efficiency and environmental friendliness are achieved, and the construction method is applicable to the situation that a free drop hammer is used in the pipe pile body to tamp the construction waste so that an expanded head can be formed.

Description

technical field [0001] The invention relates to a building structure and a construction method, in particular to a high-frequency vibratory bottom expansion grouting pipe pile and a construction method thereof. Background technique [0002] Prestressed concrete pipe piles are referred to as PC and PHC pipe piles for short. It has factory production, prestressed steel bar tensioning on the pile body, concrete steam curing, high-pressure steam curing, high concrete strength, stable and reliable quality, high degree of standardized production, hoisting and transportation, The convenience of on-site construction and other features are welcomed by the majority of owners, designers and construction units. [0003] Since the introduction of this technology in Guangdong in the early 1990s, prestressed concrete pipe piles have spread all over the country from the production of pipe piles to the construction of pipe piles. Also from steel wire rope back pressure to the current large ...

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Problems solved by technology

[0004] However, no matter the hammering or static pressure construction method is used for the construction of pipe piles, most of them are soil-squeezing piles, which will inevitably be squeezed by piles and the soil will be disturbed, which will change the stress state of the soil and cause a large compaction of the compact cohesive soil. effect, it is easy for multi-pile cap piles and piles with dense pile spacing to re-extrude the pressed pile soil and float up, and the pile ends are "suspended" so that the bearing capacity of the pile cannot meet the design requirements. Take supplementary piles Or reinforcement treatment plan, which is time-consuming and economical, and due to different geological conditions, improper selection of equipment, pile forest phenomenon is more common during construction and excavation, because the design depth is not reached, and the pipe pile exceeds the pile top elevation 1-3 meters

In addition, during the construction of pipe piles, friction piles are generally used as the bearing capacity of single piles in general design, and the bearing capacity of single piles is relatively small compared with the concrete strength of the pile body, and the advantages of pile height and concrete are not fully utilized. Therefore, in view of the above problems, it is necessary to design The equipment and construction technology of high-frequency vibratory bottom-expanding grouting pipe piles overcome the shortcomings of existing pipe piles and construction

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