Pretreatment method for guaranteeing normal ultrasonic detection inside cast-in-situ bored pile

Abstract

The invention discloses a pretreatment method for guaranteeing normal ultrasonic detection inside a cast-in-situ bored pile. The pretreatment method comprises the major steps that butt joint of a pile foundation reinforcement cage and a sounding pipe at a hole mouth can be conducted in a conventional construction method, the pile foundation reinforcement cage is fixed to a construction plane after butt joint is completed, and then a polyethylene tube is inserted into the sounding pipe to a designed bottom elevation; after the polyethylene tube is inserted and fixed, an upper sealing end plate of the sounding pipe is welded and fixed to the top end of the sounding pipe, and it is guaranteed that the polyethylene tube is exposed out and fixed to an anchor block; and in the process of pile foundation concrete pouring, the opening of the polyethylene tube is sealed with adhesive tape, and it is guaranteed that impurities including concrete and the like are prevented from entering the polyethylene tube. The pretreatment method for guaranteeing normal ultrasonic detection inside the cast-in-situ bored pile is mainly used for pouring of pile foundations under the geological, weather and hydrologic conditions of soft ground, large number of sand layers contained, frequent sea wind throughout the year under the effect of ocean currents and tendency of precipitation in the summer; the situation that in the connection process of the sounding pipe, part of sand holes are filled with grout, and the sounding pipe is contaminated and blocked can be avoided; and the smoothness of the sounding pipe in the construction process is guaranteed so that pile foundation detection can be conducted.

Description

technical field [0001] The invention relates to a pretreatment method for ensuring the normal detection of ultrasonic waves in bored piles. Background technique [0002] At present, cast-in-situ piles have been used in many construction projects as an important foundation type in our country. Common construction methods of bored piles include positive circulation construction, reverse circulation construction, and rotary drilling construction. Cast-in-situ piles are underground concealed projects. Due to many construction procedures, the technological processes are closely connected with each other, and the construction process of the main procedures is underground. Underwater, it is not easy to monitor. At the same time, there are many factors that affect the normal construction and construction quality, and it is difficult to predict them all. Therefore, defects in various forms such as shrinkage, mud inclusion, segregation, and broken piles will inevitably occur, affectin...

AI Technical Summary

Problems solved by technology

[0004] The foundation is soft and contains a large amount of sand. Under the action of sea currents, there are many sea breezes all year round, and the geological, meteorological and hydrological conditions that are prone to precipitation in summer have a great impact on the construction of bored piles. Therefore, it is necessary to ensure that the acoustic measurement during construction The smoothness of the pipe can control the pile quality of the bored pile at any time, but there is no means of quality inspection for the pile body under the geological, meteorological, and hydrological conditions.

Images