Views:7 Author:Site Editor Publish Time: 2019-07-03 Origin:Site
Traditional concrete building slabs generally use cast-in-place slabs to match the construction method of the formwork frame. With the continuous development of building requirements and related technologies, especially the rapid emergence of steel structures and the diversification of building shapes, the construction method of cast-in-place plates exposes its inevitable problems.
The main performance of the cast-in-place board is that the workload of the on-site formwork is large and the overall economic performance is poor. In the high-rise steel structure, the use of the profiled steel plate is a common method of floor construction, but with the emergence of a new process of truss decking sheet, breaking the past pattern, replacing the cast-in-place plate and the profiled steel plate Board. The reinforced truss floor slab is a combined structural system in which the main stressed steel bars in the slab are processed into reinforced concrete trusses by special equipment in the factory, and then the reinforced concrete trusses are welded together with the galvanized steel sheets. After pouring concrete, a reinforced concrete slab is formed, which is subjected to the load during use.
Reinforced truss floor slabs are still used in the construction industry, but many of them sell reinforced truss floor slabs when they encounter problems, but they don't know how to answer them, because the laymen watch the excitement and the insiders look at the doorways. Perhaps the customer will ask you how much the span of the secondary beam is used, and how thick the reinforced truss floor is to be used. I believe many customers will say a lot.
In quality, we may have overlooked some problems. The thickness of the truss truss floor is directly linked to the height of the concrete in addition to the span of the secondary beam. When the thickness of the truss truss is determined, the truss truss During the construction process, the height of the welding nails is guaranteed to be about 25 mm lower than the total thickness of the floor. The thickness of the reinforced concrete truss floor is generally between 100mm and 260mm, and the thickness of the concrete is relatively low. For example, when the wave height of the reinforced truss floor is 70mm, the height of the concrete is kept at 100mm. The force mode and combination mode of the reinforced truss floor slab are reasonable, and the overall rigidity of the cast-in-place concrete can be easily completed and constructed. The steel bars in the reinforced concrete truss floor are processed into reinforced concrete trusses, and then the reinforced concrete trusses and the galvanized steel plates are welded into one formwork. The formwork system uses the steel bars in the concrete floor slab and the construction formwork to be integrated into one. . The components that can withstand the weight of the concrete and the construction load during the construction phase can be used as the lateral support of the steel in the construction stage. During the use, the reinforced concrete truss and concrete work together to withstand the load.
Steel plates do not need to participate in the force, do not use fire-resistant and anti-corrosion coatings, and do not need to worry about the repair problems after the fire. Safe and economical, the bottom of the board is flat, the net height is guaranteed, the height of the two-way floor is consistent, and it has good seismic performance. It solves the problem of two-way reinforcement of the closed plate, and the spacing of the steel bars and the thickness of the concrete protection layer are guaranteed. In any case, after the reinforced truss floor slab is in place, the vertical steel bars at the ends and the steel beams shall be spot welded firmly.
The bottom mold and the steel beam are spot welded along the width direction of the plate, and the welding is performed by manual arc welding at a pitch of not more than 300 mm. After laying a certain area, the bottom ribs of the slab must be tied in time to prevent the truss from being laterally unstable. At the same time, it must be temporarily supported according to the design requirements, and ensure that the support is stable and reliable. The opening of the floor slab must be reinforced with steel bars and side dies according to the design requirements. When the slab concrete reaches the design strength, the steel bars of the reinforced concrete truss can be cut. In the case of a change in the shape of the plane, the end of the reinforced truss can be cut, and the end of the welded end support can be repaired. The above is to explain the development trend of the circular reinforced concrete truss floor, I hope to help you solve the problem.
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