Device for detecting overfilling height of cast-in-situ bored pile in real time and detection method thereof

Abstract

The invention discloses a device for detecting the overfilling height of a cast-in-situ bored pile in real time and a detection method thereof. The device comprises a floating tray, a pressure box anda frequency acquisition instrument, the pressure box is mounted on the upper surface of the floating tray, the lower surface of the floating tray is connected with a threaded rod, and the threaded rod is provided with a counterweight. Concrete is poured into a drilled hole for the first time, the floating tray is placed down in the drilled hole and repeatedly lifted up and down to ensure that thefloating tray is in contact with a hybrid layer, after the floating tray is stable, the frequency of the pressure box is acquired, the pressure P of floating mud on the pressure box at different depths in the pouring process is calculated according to the measured frequency and a corresponding pressure box calibration coefficient, then the mud weight gamma is measured, and the distance between the pressure box and the orifice elevation is obtained according to P=gamma h so as to obtain the length of the bored pile.

Description

technical field [0001] The invention belongs to the technical field of pile foundation detection, and in particular relates to a device and a detection method for real-time detection of the overfilling height of bored piles. Background technique [0002] As the most effective measure to ensure the quality of the pile body, the detection of concrete overfilling height has been highly concerned by relevant professionals at home and abroad. The accuracy of the detection method can directly affect the quality and progress of the foundation construction. If the detection height is too high, it is easy to As a result, the construction personnel accelerated the lifting speed of the grouting pipe, so that the laitance layer was at the bottom of the pile or in the middle of the pile body, forming mud inclusions or broken piles. In addition, there were still major engineering quality problems that the pile length could not meet the design requirements due to insufficient irrigation. ;...

AI Technical Summary

Problems solved by technology

[0002] As the most effective measure to ensure the quality of the pile body, the detection of concrete overfilling height has been highly concerned by relevant professionals at home and abroad. The accuracy of the detection method can directly affect the quality and progress of the foundation construction. If the detection height is too high, it is easy to As a result, the construction personnel accelerated the lifting speed of the grouting pipe, so that the laitance layer was at the bottom of the pile or in the middle of the pile body, forming mud inclusions or broken piles. In addition, there were still major engineering quality problems that the pile length could not meet the design requirements due to insufficient irrigation. ; If the detection height is low, the final overfilling height of the pile top will be far greater than the design elevation, which will not only cause waste of materials, but also greatly increase the labor cost and external transportation cost of the later pile head removal, and at the same time make it difficult to excavate the earth on site , which seriously affected the progress of the construction

[0003] At present, the pile top elevation of bored piles is measured on-site by the heavy hammer detection method and the cone measurement method. To ensure that the iron parts reach the bottom of the hole, the thickness of the sediment at the top of the pile is obtained by subtracting the reading of the rope ruler from the total length of the rotating rod, so as to obtain the overfilling height of the concrete. Although this method is easy to operate, the detection result is very inaccurate; The working principle is to measure the length with a measuring cone in the conduit, lift the conduit to a certain length, measure the length of the conduit with a measuring disc after it is still, and subtract the measuring needle from the measuring disc to calculate the thickness of the pile top sediment, thereby obtaining the height of the concrete pile top , this method is relatively cumbersome to operate, and the detection results are also inaccurate. In addition, the above two methods cannot detect the superfill height of concrete in real time, which has a certain impact on the construction progress

Images