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A calibration method of transient electromagnetic instrument for rotary spraying operation

A technology of transient electromagnetic instrument and calibration method, which is applied in the direction of basic structure test, construction, basic structure engineering, etc., can solve the problems that it is difficult to take remedial methods and cannot make up for material waste, so that the monitoring results are clear and intuitive, and the main problems are eliminated. Noise source, input lossless effect

Active Publication Date: 2020-12-04
BEIJING ZHONGYAN DADI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drilling and coring is the most direct and widely used detection method. It belongs to the posterior method. The problem is that even if the pile diameter is found to be too small, it is difficult to take remedial measures; if the pile diameter is found to be too large, it is impossible to compensate for the material waste of

Method used

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  • A calibration method of transient electromagnetic instrument for rotary spraying operation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023]Choose an outdoor site for the test. The test site is clay soil. The test process is as follows:

[0024]Such asfigure 1 As shown, a method for calibrating a transient electromagnetic instrument for rotary jet grouting operation is characterized in that the method for real-time monitoring of the quality and size of the pile diameter during jet grouting pile construction based on the transient electromagnetic instrument adopts the following steps:

[0025]Step 1: Determine the jet grouting test plan. The jet grouting pile design pile diameter d is 2.0m, the pile length L is 10m, the jet grouting slurry is cement slurry, the cement slurry water-cement ratio is 1.2, and the actual pre-test results are in the cement slurry Incorporate appropriate amount of additives;

[0026]Step 2: Instrument preparation, according to the design value d of the jet grouting pile diameter, select the matching transient electromagnetic instrument collector and its host;

[0027]Step 3: Pre-test preparation. Put...

Embodiment 2

[0037]Choose an outdoor site for the test. The test site is clay soil. The test process is as follows:

[0038]Such asfigure 1 As shown, a method for calibrating a transient electromagnetic instrument for jet grouting operation is characterized in that the method for real-time monitoring of the quality and size of the pile diameter during jet grouting pile construction based on the transient electromagnetic instrument adopts the following steps:

[0039]Step 1: Determine the jet grouting test plan. The jet grouting pile design pile diameter d is 1.5m, the pile length L is 15m, the jet grouting slurry is cement slurry, the cement slurry water-cement ratio is 1, and the actual pre-test results are in the cement slurry Incorporate appropriate amount of additives;

[0040]Step 2: Instrument preparation, according to the design value d of the jet grouting pile diameter, select the matching transient electromagnetic instrument collector and its host;

[0041]Step 3: Pre-test preparation. Put the ceme...

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Abstract

The invention discloses a calibration method of a transient electromagnetic instrument for rotary jet grouting operation and belongs to the technical aspect of construction quality monitoring of a rotary jet grouting pile in the foundation treatment field. The calibration method comprises the following steps: determining the scheme of a rotary jet grouting test; preparing instruments; preparing apre-test; carrying out pre-test; carrying out a rotary jet grouting test; analyzing the testing results; and popularizing and applying the results. According to the calibration method, the transient electromagnetic method is adopted to carry out visual construction on deep-layer concealed engineering to realize real-time monitoring and dynamic control purposes, the monitoring instrument is light and easy to carry and simple and time-saving to operate, clear and visualized in monitoring result, has the characteristics of being high in precision, simple in step, flexible and fast, low in investment and nondestructive, and is suitable for popularization and application.

Description

Technical field[0001]The invention relates to the technical aspect of the construction quality monitoring of jet grouting piles in the field of foundation treatment, and particularly relates to a method for calibrating a transient electromagnetic instrument for jet grouting operations.Background technique[0002]The transient electromagnetic field method is a time domain artificial source electromagnetic detection method based on the principle of electromagnetic induction. It uses step-shaped electromagnetic pulse excitation, uses an ungrounded loop to launch a primary field underground. After the primary field is powered off, the induced secondary field generated by the underground medium is measured over time to find various geological A method of geophysical prospecting for targets.[0003]The jet grouting pile is to use a drilling rig to place the jet grouting pipe and nozzle drill at the design elevation of the bottom of the pile. After the pre-prepared slurries are passed through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 宋伟杰李建平朱庆凯刘光磊武思宇吴梦龙侯恩品
Owner BEIJING ZHONGYAN DADI TECH CO LTD