Pressure steel pipe contact grouting void detection method and device

A penstock, contact grouting technology, applied in sustainable construction, climate sustainability, infrastructure testing, etc., can solve problems such as difficulty in grouting quality inspection, and achieve low cost, simple instrument erection, and simple and easy-to-obtain devices. Effect

Active Publication Date: 2021-09-24
STATE GRID XINYUAN +2
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AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that it is difficult to detect the grouting quality of penstock lined steel pipe tunnels in hydropower stations, the present invention provides a penstock steel contact grouting void detection method and device, which will not cause secondary damage to penstock steel pipes, and can be used for the internal expansion of grouted concrete. Test, the detection data has higher accuracy, and the operation method is simple, the device is easy to erect, and the detection efficiency is high

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  • Pressure steel pipe contact grouting void detection method and device
  • Pressure steel pipe contact grouting void detection method and device
  • Pressure steel pipe contact grouting void detection method and device

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0034] Such as Figure 3 ~ Figure 5 As shown, this embodiment provides a method for detecting voids in contact grouting of penstocks, including:

[0035] Step 1: Check whether the grouting hole on the penstock is blocked. If the grouting hole is blocked by concrete, it is advisable to use a percussion drill with a drill bit diameter slightly smaller than the inner diameter of the grouting hole to dredge it. The drilling depth should be slightly greater than the length of the grouting pipe. But do not drill into the surrounding rock formation;

[0036] Step 2: Select the section to be detected;

[0037] Step 3: Select a grouting hole on the section to be detected as the air inlet hole, and the other grouting holes on the section to be detected that are not used as the air inlet hole and the grouting holes on the adjacent sections of the section to b...

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Abstract

The invention relates to the field of water conservancy and hydropower, in particular to a pressure steel pipe contact grouting void detection method. The pressure steel pipe contact grouting void detection method comprises the steps that a grouting hole in a pressure steel pipe is dredged; a to-be-detected section is selected; one grouting hole is selected on the to-be-detected section is selected as an air inlet hole, the other grouting holes, which are not used as the air inlet holes, on the to-be-detected section and the grouting holes on the adjacent sections of the to-be-detected section are used as monitoring holes, connecting pipes are arranged on the air inlet holes and the monitoring holes, and air flow sensors are arranged on the connecting pipes; air is fed into the connecting pipes of the air inlet holes; and recording is carried out after the reading of each air flow sensor is stable, and the data of each air flow sensor before the step 4 are compared. The invention further relates to a pressure steel pipe contact grouting void detection device. During detection, secondary damage to the pressure steel pipe is avoided, testing is carried out in grouting concrete, detection data has higher accuracy, the operation method is simple and convenient, the device is easy to erect, and the detection efficiency is high.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower, in particular to a method and device for detecting voids of pressure steel pipe contact grouting. Background technique [0002] The penstock of a hydropower station refers to the pipeline that transports water from the reservoir, the forebay or the surge chamber to the turbine in the power plant. It has the characteristics of high water head and low installation elevation. It is mostly arranged in the surrounding rock to form an underground buried pipe. For a tunnel with multi-layer lining, the function of the pipeline steel lining is to bear part of the internal water pressure and prevent seepage, and the function of backfilling concrete is to transfer part of the internal water pressure to the surrounding rock. Therefore, the backfill concrete must be closely combined with the steel lining and surrounding rock to form a combination of steel lining-concrete lining-surrounding rock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00E02D2600/10Y02B10/50Y02E10/20
Inventor 茹松楠李作舟周开涛刘汉东胡广柱薛方方刘杨秦鸿哲赵浩龙小刚郑成成张朋飞姜泽明王甲亮
Owner STATE GRID XINYUAN
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