Precast prestressed pipe pressure slurry approach bridge and site construction

Prestressed pipe pressure slurry in prestressed pipe pressure slurry in a beam factory construction, the construction site 1, on the production and living area layout is reasonable, orderly, main road application of concrete hardening. 2, prefabricated field should adopt C20 concrete hardening, concrete thickness is not less than 10 cm. 3, set up reasonable drainage and sewage treatment measures, to ensure that the floor smooth drainage and do not pollute the local environment. 4, the prefabricated field should be set up project summary, layout, safety civilization construction signs, etc. Second, precast beams and slabs pedestal requirements 1, pedestal setting on the geological good foundation as far as possible, otherwise should be reinforcement. Between the pedestal and construction of pavement and subgrade slope to have enough safe distance. 2, prefabricated beam pedestal pedestal and stock should be set with the contractor precast beam quantity and time limit for a project request, and a certain amount of leeway. 3, the pedestal of precast beam intensity should satisfy the requirement of the tension after pressure. Pedestal the camber ( Prestressing camber) Setting should meet the design requirements. 4, the side of the pedestal should be straight, there should be effective measures to prevent slurry. 5, with longitudinal slope of the bridge, on both ends of the pedestal bearing position should establish triangular wedge, ensure the levelness of the bearing, at the same time should also be considered when tensioning embedded steel plate activity. 6, prefabricated pedestal, beam pedestal spacing should be greater than 1. Five times the height of side form, so that the hoisting template. 7, T beam horizontal clapboard bottom die not got behind with the side form an organic whole, must adopt the bottom die alone, after the side form, had promised to dismantle diaphragm plate at the bottom of the mold can still support role, to avoid the diaphragm plate and flange and web junction caused by premature diaphragm plate concrete dangling crack. 3, 1, T beam, beam slab template requires the outer edge of the hollow slab template must be the whole new steel, the panel thickness is not less than 6 mm, and pay attention to the fine polishing steel welding joint. 2, the bottom of the pedestal mould shall be not less than 6 mm thick steel plate high, shall not adopt any concrete bottom die. When construction will steel embedded in concrete pedestal on the ceiling, and ensure the plate level off, smooth. In front of the precast construction should be brush anti-rust oil and plastic mulch to ensure the color of the bottom of the beam is consistent without rust, pedestal embedded rubber sealing strip requirements, identify the location of the stirrup significantly. 3, hollow slab template must be used within the steel mould and should have enough stiffness, requirements accurately, and firm, to ensure that the thickness of the plate girder roof, floor and sides. To prevent leak slurry, seams, a model with plastic film. 4, beam slab formwork should be installed straight and firm. Casting process, should be charge, check the template, template to prevent displacement deformation and make Bridges appear wavy. 5, according to the concrete vibrating compaction requirement of the lateral mode about at regular intervals with a vibrator attached type, on both sides of the staggered arrangement. 6, templates, stripping the seam an agent should careful modulation, besmear to brush, demoulding beauty thin seam an agent and make the template surface evenly, make sure beam piece of colour and lustre is consistent, the surface is bright and clean. 7, when liang set transverse slope, the beam wing plate must be prefabricated transverse slope. Four, gestures auxiliary facilities requirements 1, the rail gantry crane shall submit calculations of contractor and approved by the supervision engineer, lifting equipment before use should be try hanging, and deal with related inspection procedures. 2, the contractor shall configure sufficient covering insulation and beam slab concrete curing facilities such as automatic spray, winter construction should be installed steam curing equipment. 3, the contractor shall strengthen the Bridges, concrete mixing concentration of field construction road sclerosis and maintenance, necessary to widen the road section and reinforcement, ensure construction safety. Conclusion: precast beams and slabs task with good quality, ensure the precast beam erection as scheduled. Through carefully chosen and reasonable construction, cost savings, and to the greatest extent possible to reduce damage to the surrounding environment, embodies the concept of green construction. Therefore, during the construction of precast beam, the careful analysis, overall consideration, select the best beam position, a variety of materials ( Prestressed pipe pressure slurry, pedestal grouting material) Is the key of the project is completed.