Detection method of leakage site position of underground concrete continuous wall

A detection method and leakage point technology, which can be applied in infrastructure testing, construction, infrastructure engineering, etc., can solve the problems of detection blind spots and high detection costs, reduce labor costs and material costs, and improve detection rates Effect

Active Publication Date: 2013-08-28
JIANGSU FANGJIAN ENG QUALIFICATION TESTING
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Problems solved by technology

[0016] The purpose of the present invention is to overcome the above deficiencies in the prior art, to provide a method for detecting leakage points in underground concrete continuous walls that does not require pre-embedded detection

Method used

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  • Detection method of leakage site position of underground concrete continuous wall
  • Detection method of leakage site position of underground concrete continuous wall

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[0038] The solution of the present invention will be described in detail below with reference to the drawings.

[0039] The underground concrete continuous wall is a concrete component. If the pouring is not dense, there will be voids or mud and sand mixed with slag. When the foundation pit is dewatered, the mud-sand slag part leaks under the action of groundwater pressure outside the foundation pit, and the mud-sand is gradually washed away by the leakage to form a gap. These voids will inevitably be filled by groundwater. The dielectric constants of concrete and water are quite different. Using the difference in the propagation speed of electromagnetic wave speed in different dielectric constant media, the leakage site can be found.

[0040] Velocity of electromagnetic waves in the medium:

[0041] ,

[0042] In the formula: V-the electromagnetic wave velocity in the medium; C-the electromagnetic wave velocity in the air; ε-the dielectric constant of the medium.

[0043] Electroma...

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Abstract

The invention relates to a detection method of a leakage site position of an underground concrete continuous wall. The detection method comprises the following steps of: (1) uniformly distributing a plurality of observation wells outside the underground concrete continuous wall; (2) pumping water inside the underground concrete continuous wall, observing the variation conditions of water levels in the observation wells outside the underground concrete continuous wall, and setting the primarily determined leakage direction; (3) after the primary leakage direction is set, determining the primary horizontal position of a leakage site by feeding and checking a tracer outside and inside the continuous wall; and (4) after the primary horizontal position of the leakage site is obtained, carrying out the detection by using a geological radar and an in-well antenna to determine the vertical position and the scale of the leakage site. The detection method has the beneficial effects that 1. the construction process of pre-embedding a pipe inside the concrete continuous wall is eliminated, and the human cost and the material cost are reduced, thereby being simple, convenient and economical; and 2. the joint part of a seam of the concrete continuous wall with a slot base can be detected so that the detection rate of the leakage site can be greatly improved.

Description

technical field [0001] The invention relates to the application technology of geological radar, in particular to a method for detecting the position of the leakage point of an underground concrete continuous wall. Background technique [0002] The underground concrete continuous wall is to excavate a narrow and long deep groove on the ground along the peripheral axis of the deep excavation project, and then pour reinforced concrete in the groove to form a continuous reinforced concrete wall underground. The underground enclosure structure with multiple functions such as foundation pit retaining soil, water interception, seepage prevention, and part of the foundation structure. Because the construction technology of the underground concrete diaphragm wall has little impact on the surrounding environment, the wall body has high rigidity, good integrity, fast construction speed, and can save earth and stone. It is one of the commonly used enclosure methods for deep foundation p...

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Application Information

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IPC IPC(8): E02D33/00
Inventor 邱文军
Owner JIANGSU FANGJIAN ENG QUALIFICATION TESTING
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