Prefabricated Building-in Metallic Construction Joints Flooring engineering has been developed into a systematic engineering of floor structure, surface treatment, sealing, surface performance and combination properties. There are more strict requirements for flooring engineering of working efficiency, flatness and levelness, attractiveness and durability, cost controls, etc. Prefabricated building-in metallic construction joints are new building materials which are applied accompany with those new materials, new techniques, new equipments and new technologies in the field of flooring engineering, such as steel fiber, laser screed machine, liquid hardener, and so on. Corresponding to the higher requirements to construction technique and floor, the processing and protection for all kinds of joints of concrete floor and slab is particularly prominent and important. Prefabricated building-in metallic construction joints provide an ideal solution to this.Traditional concrete placing and casting job need many labors in formwork, elevation measuring & surveying, dowel bars inserting and the removal of forms after the completion of casting work. It is easy to deform for wood template, while steel template need to be coated with release agent. Removing the forms will possibly damage the concrete. The edges of construction joints are the weaknesses. The template is not so straight usually, so cutting down to be straight at the edge will be easy to form the second seam which is easily to collapse after the concrete put into use.Construction joints is very important to avoid irregular crack appears to the floor. If it is not protected, the floor will quickly be destroyed after put into use; it means expensive repair cost for the ground. Not only cause ugly appearance, but also cause expensive damage for the material handling vehicle on the uneven floor surface. To repair the damaged floor will be inevitably influences owner’s producing activities.Prefabricated building-in metallic construction joints are used to create a boundary in which to contain a day’s concrete pour. As the concrete sets and contracts, the two sides of the joint are gradually pulled apart horizontally. Plate Dowels fixed through the centre stop the slabs moving vertically and allow for load transfer between the two sections of the floor. Once the floor has contracted, the gap between the two sides of the joint can simply be filled with a suitable joint sealant.The grid-cut face, comprising a series of punched rectangular holes, means the joint can be cut at any point along its length and still firmly hold the concrete.Prefabricated building-in metallic construction joints are manufactured by factories with unified specifications, so they are more flat and beautiful after installation. They can provide more effectively protection to the joints of concrete floor, not only making it much durable, but also saving a lot of labors.There is not special requirement to the substrate which is due to the prefabricated building-in metallic construction joints, and the joints adapt to current national standards or specifications. They are appropriate for the flooring construction of large area.The technology of prefabricated building-in metallic construction joints doesn’t need the pouring sequence just like that of traditional technology, if the transportation permits, you can pour concrete to the next space anytime. If combine with laser screed machine, a day’s concrete pour will break through the limits of traditional methods. The economical efficiency and flexibility in construction period are very outstanding. While the methods of traditional formwork erecting and dividing pouring area will limit the advantages of laser screed machine.The new building material of prefabricated building-in metallic construction joints has a brilliant market application prospect.
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