A Method of Determining the Elevation of Drilled Cast-in-situ Pile Using Laser Line Meter

Abstract

The invention discloses a method for determining the elevation of a bored pile through a cross line laser. The method includes the steps that an elevation control pile is arranged on the ground; marks are marked on a drill rod and a sliding staff; the cross line laser is used for controlling the elevation of the bottom of a drill hole and the elevation of the top of the bored pile. The method has the advantages that leveling work is not needed, and therefore efficiency is improved; data calculation is not needed, and therefore time is shortened; a measuring line does not need to be used for measuring the depth of the bottom of the hole, and therefore the number of employed measuring professionals is greatly decreased. A supervision acceptance procedure can be finished at night, and therefore construction is accelerated. In a word, according to the method, the elevation of the bored pile is easy, convenient and rapid to achieve effortlessly, labor is saved, the construction cost is reduced, the construction is accelerated, and construction efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of civil construction, and in particular relates to a method for determining the elevation of bored piles by using a laser line thrower. Background technique [0002] In the traditional bored pile construction, the casing must be buried in advance at the hole, its function is to control the hole position of the bored pile; the second is to control the elevation of the bottom of the hole after drilling by measuring the elevation of the top surface of the casing. That is to control the drilling depth. Because the casing needs to be buried before each pile is driven in, and the elevation of the casing cannot be accurately controlled, so the top elevation of each casing of each pile is different, so it is necessary to measure the height of each pile casing The elevation of the top surface, and the depth of driving each pile relative to the top surface of the casing through calculation. However, this traditiona...

AI Technical Summary

Problems solved by technology

Because it is impossible to bury the casing at each pile position at the same time, the casing can only be pulled out after one pile is drilled and then buried to the next pile. That is to say, an elevation measurement is required every time the casing is buried. This leads to an increase in the frequency of measurements, which is prone to measurement errors

[0005] (2) The amount of calculation is large and it is easy to cause errors

[0006] The measured data needs to be calculated one by one relative to ±0.000, so that the specific hole depth of each pile can be obtained, which will undoubtedly increase the calculation amount and cause calculation errors

[0007] (3) Use measuring rope to measure the drilling depth, which is a waste of manpower and has a large error

[0008] During the drilling process, someone must continuously measure the size from the bottom of the hole to the top surface of the casing with a measuring rope, so as to judge whether the design elevation of the bottom of the hole has been drilled, which is a waste of manpower and the measurement data is inaccurate

[0009] (4) Continuous construction day and night requires more surveyors

Each shift of measurement requires at least 3 professional surveyors for real-time control, including 1 person to measure the ruler, 1 person to observe, and 1 person to re-measure and record data. If calculated as 3 working days per day, 3 measurement teams with a total of 9 people are required can be completed, which will increase the investment of professionals

[0011] (5) The line of sight is affected at night, the supervisor cannot implement the acceptance procedure, and the site is stagnant

[0012] Due to the dim light during construction at night, accurate readings cannot be made through the leveling rod, and the conditions for leveling measurement are not available, which will easily lead to the loss of control of the height of the cast-in-situ pile

In addition, it is also difficult for the supervisory engineer at the side station to check and accept the depth of the hole, and it is likely to ask for re-inspection during the day, so that subsequent construction cannot be carried out, resulting in on-site delays and mechanical stagnation, affecting the construction progress

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