Construction method of drilling follow casting pile used for building or bridge foundation

Abstract

The invention relates to a construction method for a drilling following pipe pile for buildings or bridge foundation. The method includes the following construction procedures: First, a drill rod is used to cover a high strength pre-stress concrete pipe or a steel pipe on the ground; the front end of the drill rod is provided with an impinger and a broaching collapsible bit, which follows the drill and the pipe, protects the wall and drills into a design elevation; drilling is terminated, and the broaching collapsible bit exits; a mortar pump is used to pump out all the mortar and sediment; concrete is poured into the pipe and pressure grouting is conducted towards the outside of the pipe wall, and stopped until the concrete and the mortar reach the ground. The invention is to present a construction method with high construction speed, reliable quality, low material consumption, high pile bearing capacity, mechanical operation and environmental protection. The invention solves the deficiencies in the current drilling pouring pile construction methods that adoption of mortar to protect the wall pollutes the environment, snakes in hole are easy to occur during drilling, quality of concrete casting is unstable, and the pre-stress pipe piles are easy to make the soil rise and lower, etc. Piles constructed with the method has high strength, the pile bottom has no sediment, the pileends are all socketed, and can achieve more than twice bearing capacity of the drilling cast-in-place piles with the same diameter.

Description

technical field [0001] The invention relates to a construction method of pipe piles for building and bridge foundations, in particular to a construction method for drilling and following pipe piles for buildings or bridge foundations. Background technique [0002] At present, the construction methods of pile types commonly used in building foundations mainly include the following types: [0003] 1. Manual hole-digging pile: due to its low cost, simple construction, good pile quality, and high bearing capacity of a single pile, this method is often used in construction projects and bridge projects, but its disadvantages are: prone to collapse and collapse during construction Toxic gas poisoning accidents, the process of excavating piles and precipitation will damage the surrounding environment, which will easily bring safety hazards and safety accidents, and its use has been strictly restricted at present. [0004] 2. Drilling (punching) cast-in-situ piles: its advantages ar...

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Problems solved by technology

[0003] 1. Manual hole-digging pile: due to its low cost, simple construction, good pile quality, and high bearing capacity of a single pile, this method is often used in construction projects and bridge projects, but its disadvantages are: prone to collapse and collapse during construction Toxic gas poisoning accidents, the process of excavating piles and precipitation will damage the surrounding environment, which will easily bring safety hazards and safety accidents, and the use has been strictly restricted at present

[0004] 2. Drilling (punching) hole grouting pile: its advantages are: high degree of mechanization, flexible change of pile diameter, high bearing capacity of piles, and its disadvantages are: construction mud pollutes the environment and the cost is high

[0005] 3. Hammer-type immersed pipe pile: its advantages are: mechanized construction and low cost, its disadvantages are: low bearing capacity of piles, easy to cause pile breakage and necking phenomenon, construction quality is difficult to guarantee, and the use of this pile is restricted in urban areas type

[0006] 4. Hammering (vibration) driving into prestressed pipe piles: its advantages are: better construction quality, but disadvantages: the bearing capacity of the pile is not high, the noise is loud during construction, the pile diameter is limited, and there is an obvious soil squeezing effect. It is difficult to meet the requirements of single-column and single-pile. It is often used in the foundation of multi-storey and small high-rise buildings. Due to noise and vibration problems in the central area of ​​the city, its use is limited.

[0007] 5. Static pressure pile: its construction speed is fast, its quality is guaranteed, and its environmental impact is small. It is widely used in current construction projects, but the disadvantage is that the bearing capacity of the pile is not high, and the maximum pile pressure cannot meet the requirements of high bearing capacity. The pile bearing capacity is generally difficult to meet the requirements of single pile and single column, and there is an obvious soil squeezing effect

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