Pumped storage power plant tail water retained rock step blasting safety protection method

A pumped-storage power station and safety protection technology, which is applied in the field of underwater rock sill blasting safety protection, can solve problems such as threatening the construction safety of workshops, and achieve the effects of convenient slag cleaning and scientific and reasonable design.

Active Publication Date: 2009-09-16
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During blasting demolition, if effective safety protection measures are not taken, under the action of blasting vibration and water shock waves, huge impact pressure will be generated on the tail water inspection door and trash rack, threatening the construction safety of the plant

Method used

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  • Pumped storage power plant tail water retained rock step blasting safety protection method
  • Pumped storage power plant tail water retained rock step blasting safety protection method
  • Pumped storage power plant tail water retained rock step blasting safety protection method

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Experimental program
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Embodiment Construction

[0019] refer to figure 1 , build a water bubble curtain at a distance of 5±1m from the blasting rock sill, and build a porous stacked beam door at a distance of 20±5m from the water bubble curtain. The blasting rock ridge 2 is built at the blasting position of the lower reservoir 1 . The lower reservoir is provided with a water retaining gate 12 for the inlet and outlet of the lower reservoir.

[0020] The water bubble curtain is composed of 20±3 steel pipes 3, the pipe length is 20m, and the pipe distance is 3m. Two rows of φ1.5mm holes are drilled on each pipe, and the distance between the holes is 50-70mm. The distance between each steel pipe and the air compressor Air pipe is connected. 5 minutes before ignition, use two 9m3 / min, 2-4×105Pa air compressors to supply air to each steel pipe, so that the air volume per meter of steel pipe is greater than 0.008m3 / s. In the two-phase curtain layer, due to the compressibility of the bubbles, part of the energy of the water sho...

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Abstract

The invention discloses a pumped storage power plant tail water retained rock step blasting safety protection method, and relates to an underwater rock step blasting safety protection method. A bladder curtain and porous stoplog gates are constructed outside a rock step to be blasted; the bladder curtain consists of a plurality of steel pipes; two rows of holes are bored on each steel pipe; and each steel pipe is connected with an air pipe of an air compressor. The porous stoplog gates consist of a steel frame and bamboo rafts; I sections are arranged on both sides of the stoplog gate of eachhole; the two sides of each I section are fixed on round flow splitting support piers through steel plates and expansion bolts; each stoplog gate is in welded connection through channel steel, the I sections and angle bars; a layer of vertical bamboo gangway is spread on the water inlet surfaces of the stoplog gates; and simultaneously safety nets are arranged on the tops of flow splitting support piers on the top and both sides of a single hole stoplog gate. The method adopts the proposal of arranging the bladder curtain plus the steel frame, the bamboo rafts and the safety nets to replace aproposal of the stoplog gate, has scientific and reasonable design, protects a trash rack and a tail gate against the damage and the influence of the blasting, and brings about easy spoil removal, short manufacturing and installation time limits, and low manufacturing, installation and demolition cost.

Description

technical field [0001] The invention relates to a safety protection method for underwater rock sill blasting. Background technique [0002] Generally speaking, the construction of the tailwater system of large-scale hydropower stations mainly adopts the reserved rock sill method, which can save construction time and reduce project costs in the early stage of construction, but after the tailwater system construction is completed, the reserved rock sill must be removed , The demolition involves underwater blasting and safety protection issues. [0003] Since the rock sill is close to the completed water diversion tunnel and its auxiliary buildings, it is about 15.0m away from the outlet (inlet) outlet of the lower dam, and the nearest to the trash rack groove is about 38m; the closest to the tailwater gate groove is about 82m; The rock ridge is connected to the reserved side wall, and is 52m away from the 2# water intake of the West Main Canal on the right bank; the traffic t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/02F42D5/045
Inventor 唐健胡代清陈秋杨洪涛彭福元沙保卫李凤丹冯钢声
Owner STATE GRID CORP OF CHINA
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