Real-time detection system and detection method for super-long bored pile elevation

Abstract

The invention discloses a detecting system and a detecting method for real-time detecting of elevation of a super-long hole bored grouting pile. The detecting system comprises an extension guiding pipe installed at the bottom of a grouting pile guiding pipe, a buoy sleeving the outer side of the extension guiding pipe, a plurality of ultrasonic probes, and a data reader, the plurality of ultrasonic probes are installed at the lower end of the outer side of a material hopper, and are configured to detect the height of the buoy, the plurality of ultrasonic probes are connected with the data reader, and the top surface of the buoy is a polished surface. The emissivity of ultrasonic waves in an intersurface between concrete and a floating layer can be increased by setting of the buoy during anunderwater concrete pouring process, the ultrasonic probes receive reflected ultrasonic waves exceeding a threshold value, on the one hand the emissivity of the ultrasonic waves can be increased, theelevation of a concrete pouring surface is more precise, the occurrence of over-grouting can be reduced, the amount of the concrete is reduced, and engineering cost is reduced; on the other hand, theelevation of the hole bored grouting pile can be accurately controlled, the probability of the occurrence of over-grouting can be reduced, and the over-grouting amount of each time of over-grouting can be reduced.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a real-time detection system and detection method for the elevation of super-long 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

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