bridge using pc strand

Low relaxation pc strand

ISO 9001:2008, ISO14001:2004 Qualified ;
Low relaxation PC strand application for large-span bridges on railways and highway,rock-soil anchoring project,
multi-story industrial buildings,stadiums,coal mines,domes for nuclear power stations and etc.
Manufacturer comply to standard ASTM A416, BS5896, AS1311, JISG3536, ISO6934, EN10138

Low Relaxation PC Strand The strand construction preparation, including working site layout, installation and test of machinery and equipment, personnel play and the purchase of materials and reserves and other preparatory work. The working place layout including drilling operations site planning, pool, concrete mixing space is flat, wind and hydropower pipeline layout and production, living rooms. The number of construction workers can be determined according to the play the number of machinery and equipment and construction conditions. In each class the group squad leader, drilling, grouting poured concrete group, air compressor drivers, anchor installation and tensioning.  Surveying required design documents, accurately set each anchor position, positioning accuracy: vertical and horizontal to ± 10cm.  2 pore-pore-forming process with the rig in place, Shi drilled three holes and hole cleaning job step. When the envelope structure foundation pit excavation to reach the anchor drilling position, the first to use steel and wood to take the battle Shi drilling operations platform. Drill rig in place require accurate positioning, design requirements, and ultimately into the hole position deviation is 10cm, hole deviation error does not exceed 2%. Facilities rig with generally wind dynamic impact rig in the loose Lot hole construction, to prevent hole collapse, should use eccentric drilling to follow up on the protection casing drilling, the drilling process, the ash was observed, mucking and air leakage good record of the weakness of the sliding surface, scattered surface surface location, to determine whether to enter the hole section stable rock (soil) layer, in order to ensure that the hole section into the stable geotechnical depth of not less than the design requirements of the anchor length. Considering Shen ballast thickness, the bottom of the hole should be super drill 30 to 50cm. Cleaning with high-pressure air into the hole, the hole wall, in order to protect the bond strength of the mortar with the hole wall. Drilling must be dry drilling, diamond is strictly prohibited. 3 the anchor cable fabrication and installation of anchor cable made of high strength, low relaxation strand, ultimate tensile strength of not less than 1860MPa. Anchor production and installation can be divided into cutting, rust and corrosion, welding cone point, lashing and into the hole six job step. Strand cutting length of the hole depth plus the reserved length and reserve length is generally 1.0 to 1.5m, with the position of the tensioning anchor models, number of lashing Festival like, pad pier and pad pier. Before lashing strand should be rust, anti-corrosion treatment, fabrication and installation of the whole process must avoid grease, dirt and other debris anchoring section strand. Strand links cloth was concentric circles, the center for the filling tube; the anchorage paragraph spacing 1 to 2m set the spacer frame and the engagement ring, the anchor cable section shape in order to increase the pullout resistance of the anchor cable, and the need set the orientation film, the anchor can be centered in the hole; the free section strand coat plastic tube, casing before the port should be a really good job every pulp measures, to prevent the grouting material invade the free section. Oriented cone anchor into the hole from the guiding role, it is welded to the anchor end of the section. Completion of the pore-forming process, artificial prefabricated anchor cable from the orifice into the bottom of the hole. Both operating process of the the grout filling points pulp and grouting. The anchor hole slurry of cement mortar, label requirements ≥ M35, with more than test preparation, adding appropriate early strength agent, to reduce tension waiting time, but the non-doped use in highly corrosive admixture. The mortar must be 525 # cement, sand sifting, plus early strength agent, mortar mixer Stir the slurry prior to the initial setting run out, and shall not be mixed with debris. Grouting a variety of methods commonly used pipe grouting and disposable pressure grouting, that is up from the bottom of the hole, the pressure not less than 0.6 to 0.8Mpa the mortar to date orifice overflowing, the grouting pipe does not pull out. This method is simple and good quality of grouting. Grouting operations at the same time, production of the corresponding mortar specimens, and buried in the landslide conservation in the tensioning process carried out for intensity.

PC Strand Application

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PC Wire and Strand Specialist

PC 2-wire strand,   PC 3-wire Strand,

PC 7-wire strand,   PC 19-wire Strand,

Unbonded PC Strand,   PC wire Manufacturer

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Add: daqiuzhuan industry area Jinghai,Tianjin 301605,China

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