Cause Analysis of Construction Quality Accident of Water Well Drill Pipe Bored Pile

Classification:

Company News

Release time:

2019-08-23

【Summary Description】 Cause Analysis of Construction Quality Accident of Water Well Drill Pipe Bored Pile

水井钻杆

Analysis of bored pile in the construction process of possible accidents, the necessary prevention is to ensure the quality of bored pile pile, to ensure the smooth foundation of the important measures.

The bearing capacity of the foundation at the bottom of the 1. pile is insufficient.

water well drill pipeIn the construction of pile bottom foundation, the bearing capacity of pile bottom foundation is insufficient because the pile end is not supported on the bearing layer. This kind of situation generally occurs in complex stratum, and coring inspection shall be carried out first. If coring cannot be carried out, comprehensive consideration shall be made with reference to the adjacent coring situation, drilling speed, rock cuttings returned from mud and drilling situation (generally, when drilling to slightly weathered rock, the drill bit does not bouncing, the active drill pipe does not vibrate severely, and the drilling sound is very good) and engineering geological data.

Hole Wall Collapse in 2. Casing-Free Construction Method

Due to the change of the bearing layer of the soil during the construction of the cast-in-place pile without casing, the quality accident of hole wall collapse caused by water leakage and slurry leakage may occur. According to the analysis of such problems,water well drill pipeIt is found that the main reasons for the construction accident are: deformation or improper shape of the casing, and insufficient head pressure.

The underground water level has high bearing pressure: there is seepage water or no water in the gravel layer and other places, and the phenomenon of water running in the hole: the bulk density and concentration of mud are insufficient; The hole-forming speed is too fast to form mud film in the hole wall.

water well drill pipeWhen hole-making machinery is used to make holes at the bottom of the casing, the soil around the hole is touched. When the steel bar is placed, it collides with the hole wall, destroying the mud film and the hole wall. The mechanical force of the hole-making machine is too large, resulting in the weakening of the adhesion between the cylinder and the soil layer.

水井钻杆

Key words:

weilida drill