Apparatus and method for measuring the elevation of concrete filling surface of bored pile

Abstract

The invention discloses a drilling hole caisson pile concrete pouring surface level measurement device and method. The measurement device includes a mounting bracket, a power mechanism, an adjustableclutch mechanism, a connecting rod mechanism and a vane wheel; the mounting bracket is positioned on a pile opening sleeve of a drilling hole caisson pile, the power mechanism is installed on the mounting bracket and connected with the connecting rod mechanism through the adjustable clutch mechanism, and the vane wheel is installed on the bottom of the connecting rod mechanism and positioned at adesigned level position of the top of the pile. By adopting the adjustable clutch mechanism, a main torque value can be preset to adapt to different slurry formulas and concrete different in label number, the application range is enlarged, and the measurement precision is improved; on the other hand, the vane wheel is positioned at the designed level position of the top of the pile, the level of the drilling hole caisson pile can be accurately controlled, occurrence of an overfilling phenomenon can be reduced, the consumption of the concrete is decreased, the quantity of redundant concrete waste blocks to be chiselled and removed is reduced at the same time, and the engineering cost is lowered.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a device and method for measuring the elevation of the concrete filling surface of bored piles. Background technique [0002] With the rapid development of my country's economy, there are more and more large buildings (structures) such as various buildings, bridges, and port terminals. Bored piles have become one of the main foundation forms of buildings (structures) due to their unique economic and technical advantages. Bored piles are mostly made of underwater concrete. In order to ensure the quality of the piles, the concrete is often required to exceed the design elevation by a certain height, and the superfilled part is chiseled after the excavation of the foundation pit. Since the hole is filled with mud during the pouring process, there is a laitance layer on the concrete at the top of the pile, so it is difficult to know exactly where the concrete pouring surface is....

AI Technical Summary

Problems solved by technology

Since the hole is filled with mud during the pouring process, there is a laitance layer on the concrete at the top of the pile, so it is difficult to know exactly where the concrete pouring surface is.

[0003] At present, the routine practice on site is to measure the top elevation of bored piles with the weight hammer method. This method is time-consuming, labor-intensive and has large errors. Excessive over-filling is not uncommon.

On the one hand, it leads to a lot of waste of concrete materials and increases the project cost; on the other hand, during the excavation process of the foundation pit, the super-filled part must be manually removed, which increases the cost and difficulty of the project, and also brings redundant removal Difficulties in burying abandoned concrete blocks and corresponding environmental protection issues

With the advancement of science and technology, engineers have developed an ultrasonic altimeter for the elevation of the concrete filling surface. However, due to the laitance layer on the top of the bored pile, the laitance layer and the anisotropy of the particles in the concrete layer, the ultrasonic scattering and diffusion phenomenon is serious. , so that in many cases only a small part of the sound wave is reflected back to the orifice probe, which cannot meet the minimum limit requirement of the probe induction, resulting in defects such as low accuracy, poor reliability and poor stability of the test results, which greatly affect The scope of application of the ultrasonic height meter for the elevation of the concrete pouring surface

Images