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

Abstract

A method for constructing pipe piles while drilling for building or bridge foundations. The construction steps are to cover high-strength prestressed concrete pipes or steel pipes with drill pipes on the ground first, and install impactors and reaming retractable drill bits at the front ends of the drill pipes. , Follow the pipe while drilling, follow the pipe retaining wall, drill to the design elevation, stop drilling, withdraw from the reaming to shrink the drill bit, use the mud pump to clean the mud and sediment, pour concrete into the pipe, and simultaneously inject pressure grout to the outside of the pipe wall , stop when concrete and grout reach the ground; the object of the invention is to propose a construction method with fast construction speed, reliable quality, less material consumption, high bearing capacity of piles, mechanized operation, and environmental protection. In the construction method of bored cast-in-place piles, the use of mud retaining walls pollutes the environment, the hole is easy to collapse during the drilling process, the quality of concrete pouring is unstable, and the prestressed pipe piles are easy to cause the soil to rise. The strength of the pile body constructed by the invention is high. , There is no sediment at the bottom of the pile, and the pile end is completely rock-socketed, which can reach more than 2 times the bearing capacity of the same diameter bored pile.

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...

AI Technical Summary

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

Images