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| Prestressed anchor rod construction preparation |
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UpdateTime：[2012/1/1 8:56:37] Hits：[2943] From：TONRY MINING SAFETY SUPPORT TECHNOLOGY CO.,LTD
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( a ) the construction preparation
The 1 material
( 1) prestressed anchor body material should choose the steel strand, steel wire with high strength or high strength rebar. When the prestressed #118alue is smaller or the bolt length is less than 20m, prestressed tendons also can use II or III grade steel.
( 2) cement paste materials: cement Ordinary portland cement, if necessary, by sulfate resistant cement, high alumina cement shall not be used. Fine aggregate should choose a particle size of less than 2mm in fine sand. Used to meet the requirements of the water quality of sewage, may use, may not use the pH #118alue is less than 4 of the acidic water.
( 3) the plastic sleeve material: should have sufficient strength, ensure the processing and installation process is not damaged, has water resistance and chemical stability, and cement mortar and preservatives in contact with no adverse reaction.
( 4) the isolation rack by steel, plastic or other rod body harmless material, not to use wooden isolation frame.
( 5): bolt anti-corrosion materials in the service life period, should maintain its durability, in the specified operating temperature or tensioning process without cracking, brittle or become fluid, not to the adjacent material adverse reactions occur, should maintain its chemical stability and waterproof performance, not on the free section deformation produces students any restrictions.
2 operating conditions
( 1) in the prestressed anchor before the construction, should according to the design requirements, soil and environmental conditions, and rational choice construction equipment, apparatus and process.
( 2) according to the design requirements and equipment specifications, models, to ensure the safety and smooth out enough for construction site.
( 3) before the construction, should carefully check raw material types, varieties, specifications and anchor the quality of the parts, and check the raw material and the main technical performance meet the design requirements.
( 4) anchorage construction, should take two anchor rod drilling, grouting, tensioning and locking of the experimental operation, examination of construction technology and equipment adaptability.
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