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Horizontal backfill grouting construction process of pressure conduit for hydraulic power plant

A construction technology and pressure pipeline technology, which is applied in the field of horizontal backfill grouting construction technology for pressure pipelines in hydropower stations, can solve the problems of large pipeline diameter, high pressure and affecting the quality of steel pipes.

Inactive Publication Date: 2009-04-29
SINOHYDRO BUREAU 5 +1
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  • Abstract
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Problems solved by technology

However, in some implementation processes, it is necessary to take into account factors such as the large drop of pressure pipes in this project, the large diameter of the pipe itself, and the use of high-strength steel for pressure pipes.
If the penstock steel pipe is found to withstand high water pressure after the dynamic load review and calculation, it will have an adverse effect on the stress of the steel pipe after the hole is opened, and even affect the quality of the steel pipe

Method used

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  • Horizontal backfill grouting construction process of pressure conduit for hydraulic power plant

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Embodiment Construction

[0014] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0015] refer to figure 1 , arrange 8 grouting pipelines within a grouting section of 41.6m and 80cm of the inner roof arch, cut and number the main pipes on site according to the buried length, and open holes according to the position of the branch pipes in the grouting section controlled by each numbered pipeline. The hole diameter is Φ20mm. Among them, 1~3, 5~7 are main grouting pipes, 4, 8 are auxiliary grouting pipes and exhaust pipes. A branch pipe is arranged every 1.4m on the control section of the main grouting pipe, and a branch pipe is arranged every 2.0m on the auxiliary pipe. The branch pipe outlet of the main grouting pipeline and the branch pipe outlet of the auxiliary pipeline are 3-5cm and 2cm away from the concrete spray protection surface respectively. Among them, the main pipe and the exhaust pipe are all galvanized iron pip...

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Abstract

The invention relates to a construction process for horizontal backfill grouting of a pressure pipeline of a hydraulic power station. The process adopts the horizontal backfill grouting construction, and steel pipes are not provided with holes, thereby solving the problem that the pressure steel pipes can not be punched, but the backfill grouting construction of the pressure steel pipes is necessary and achieving good effects.

Description

technical field [0001] The invention relates to a horizontal backfill grouting construction technology for pressure pipelines of hydropower stations. Background technique [0002] At present, when the pressure pipeline is backfilled and grouted, vertical holes are drilled radially along the pipeline for grouting. However, in some implementation processes, it is necessary to consider factors such as the large drop of the pressure pipeline of this project, the large diameter of the pipeline itself, and the use of high-strength steel for the penstock steel pipes. For example, after rechecking and calculating the dynamic load, it is found that the penstock is subjected to high water pressure, which will have an adverse effect on the force of the steel pipe after the hole is opened, and even affect the quality of the steel pipe. Therefore, we need to develop a new pressure pipe grouting method. Contents of the invention [0003] In order to solve the above problems, the prese...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B9/00
CPCY02E10/22Y02E10/20
Inventor 康建荣李福林葛鹏钊
Owner SINOHYDRO BUREAU 5