Polystyrene on the bridge in the hollow mandrel

In recent years, conventional precast hollow mandrel tube mold air capsules. It is used as a core template superseding range of steel template. It is relatively light weight, simple structure, convenient installation and removal of the capsule air tube mold can be reused, the same applies to sizes, a larger number of prefabricated factory, but its price is high, not too low when the number of plates prefabricated economy. Two air capsule tube mold, only a single piece of hollow prefabricated, need to be strong after construction Concrete plug ends stripping, step increase, progress is slow; need professionals to operate, such as the extent of inflation, floating control , stripping time and other essentials easy to master. In this paper, specific examples of projects, precast hollow mandrel selected common alternative to traditional polystyrene foam core module that compared to the traditional air capsule tube molding, shaping template, steel and wood combination template, with easy-to-purchase, easy processing , low cost, simple operation, reduce process and other significant advantages, especially suitable for precast hollow slab bridge construction. Polystyrene which is characterized by prestressed hollow centralized prefabrication can be organized to save resources, reduce engineering costs, reduce construction site, the destruction of the natural environment and less pollution of air and water; short construction period, the construction process is relatively simple and mature. For the upper part of the 13m pre-tensioned prestressed concrete hollow plate beam, the project made use of polystyrene foam core mold, simple and intuitive than air capsule tube mold for precast prestressed concrete hollow slab once purchase, simultaneous multi-block Prefabricated, saving period; without Chaimo, a shape, more economical. 2 precast hollow polystyrene foam core construction process control module uses a layout, panels forming a pouring way. That is, after installation of prefabricated steel reinforcement and the outer mold is completed, temporarily blocked the installation of concrete transverse reinforcement, the first docking with transparent tape to the design length pieces of polystyrene foam mandrel penetration board, the use of PVC pipe directly into hole, accurate positioning and strengthening the core module firmly, and finally completed the installation of reinforced concrete capping and plug templates reinforcement, excessive vibration or excessive vibration leakage occurs due to leakage of vibration will affect the concrete dense, it will cause excessive vibration floating mandrel or offset. A blocked concrete and pouring a concrete slab body forming mandrel without removing it, pouring forming mandrel do not have to worry about rupture when vibrated. Polystyrene foam mold is used in the fermentation of polystyrene foam density per cubic meter of not less than 5kg-6kg, foam generally made 3m ~ 4m one, made by the manufacturer directly for the appropriate design size hollow inside Since lighter, hollow plate small increase in weight. With this in-mold hollow web and roof thickness to maintain a uniform consistency. 3 polystyrene foam mandrel construction process control using polystyrene foam shaping mandrel, mandrel how to ensure vibration compacting concrete bottom, how to make sure the bottom of the in-situ concrete quality is necessary to solve the problem. (1) the actual construction, the use of first pouring the floor, add mandrel, while pouring, while filling the segment construction methods, so that this problem has been solved. (2) from a good roof reinforcement lashing start at one end, first floor concrete pouring of the first paragraph, and ensure the concrete surface vibration compacting achieve the design thickness, manual removal of more concrete beyond the design elevation. Then placed in the reserve position mandrel, until the mandrel accurate positioning, on its three sides face every 1m placed into a plum-type pad, then lashing the roof and embedded steel, steel banding completed within half an hour. (3) The steel banding to be completed, the web and roof concrete pouring, pouring in on both sides of the web, special attention should be stratified balanced on both sides of the concrete rises, you do not have time interval. Both sides of the parallel vibration, to prevent mold around offset. When using vibrators vibrator should avoid touching prestressing tendons, reinforcement and formwork; strictly control the beam height control can not be pouring the concrete surface is too high, when the bridge in place to prevent a greater positive elevation error. After completion of the beam pouring flattened top, pull hair. To control the speed and placement of concrete decking thickness to ensure the quality of concrete at the bottom of the mandrel, shop materials to meet the edge, the edge vibration requirements. Vibration time strictly prohibited vibrators pull material and excessive vibration to avoid offset and floating mandrel. 4 Conclusion polystyrene foam mandrel tube compared to traditional air capsule mold, with light weight, easy to purchase, easy processing, low cost, simple operation, reduce the process and other significant advantages, it can make hollow top, bottom and side wall thickness dimensions can be effectively guaranteed, it solves the use of air capsules easy to deviate tube mold, resulting in hollow float top, side walls locally produced ultra-thin quality problems, especially for the construction of hollow slab bridge. Color bridge within Xinxiang Wanda mold factory is prestressed bridge with in-mold foam, Color Room, steel truss room, prestressed bridge with anchor plate, external wall insulation board and other professional production and processing company, has a complete, scientific quality management system. The company's integrity, strength and quality of products recognized by the industry. Welcome friends to visit, guidance and business negotiation. Our research and development with a polystyrene foam core templates bridge solves the problem of precast slab bridge capsule floating in inflatable roof thickness and technical problems, bridge hollow slab of polystyrene foam used in place of inflatable capsule, to ensure the accurate positioning within the mold and structure complete design size. Get the relevant experts and customer recognition and praise. Project: Henan Huai solid two standard high-speed civil, Henan Huai solid high-speed civil three standard, Henan Huai solid four-speed civil standard, Henan Huai solid civil six-speed standard, Henan Huai solid seven-speed civil standard, Henan Province, high-speed civil Deng three standard Henan Xichuan X110 line first precast plant, Xichuan X110 line third precast plant, Jing Hu set a new high-speed standard Pingdiquan mixing station, Beijing set a new high-speed standard Tuchengzi Hu a mixing station, Beijing set a new high-speed Hu 18 sets a standard mixing stations and other companies Sales Manager Zhao Tel: 13937394068 18703735315 Company Website: www.wsjxcg.com Address: Xinxiang City store industrial zone