The following is the analysis of steel floor decking and steel truss floor decking brought to you by Zhongda Consulting for your reference.
Floor decking (steel decking, building profiled steel plate) is made of galvanized steel plate that is rolled and cold-bent. Its cross-section is V-shaped, U-shaped, trapezoidal or similar to these shapes. , primarily used as a permanent template, but can also be selected for other uses. It is called composite floor slab, floor decking, steel decking, profiled steel plate, floor slab, steel floor decking, composite floor slab, galvanized steel decking, galvanized floor slab, galvanized floor decking, composite floor decking , composite floor slabs, floor steel decks, construction profiled steel plates, composite floor slabs, etc., which are further divided into: open floor decks, fully closed floor decks, dovetail floor decks (also called shrinkage floor decks) Main features 1: It adapts to the requirements of rapid construction of the main steel structure, can provide a firm working platform in a short time, and can adopt the flow construction of laying profiled steel plates on multiple floors and pouring concrete slabs in layers. 2: During the use stage, the floor deck serves as the tensile steel bar for the concrete floor slab, which also increases the stiffness of the floor slab and saves the amount of steel bars and concrete. 3: The embossing on the surface of the profiled board creates the maximum bonding force between the floor decking and the concrete, making the two form a whole. Together with the stiffening ribs, the floor decking system has a high bearing capacity. 4: Under cantilever conditions, the floor decking only serves as a permanent formwork. The length of the overhang can be determined according to the cross-sectional characteristics of the floor deck. In order to prevent the cantilever plate from cracking, it is necessary to add negative reinforcement at the support according to the design of the structural engineer. 5: Our company's floor decking has passed the fire resistance limit test of the National Fixed Fire Extinguishing System and Fire-Resistant Component Quality Inspection Center. As a combined floor decking, fireproof spraying is not required, thus greatly reducing the project cost. Product Application Products are widely used in power plants, power equipment companies, automobile showrooms, steel structure factories, cement warehouses, steel structure offices, airport terminals, train stations, stadiums, concert halls, grand theaters, large supermarkets, logistics centers, Olympic Games Stadiums, stadiums and other steel structure buildings. Product test a. Dynamic loading test. Qualified floor decking needs to undergo several sets of dynamic loading tests to obtain the shear-bonding coefficient of the composite board. Test the bonding ability between the floor decking and concrete to determine its long-span performance. the design load to be borne. b. Fire resistance test: 3 groups of floor slabs were used in the fire resistance laboratory to perform 1.5-hour, 2-hour and 3-hour loading fire resistance tests. At the same time, the temperature distribution in the floor slabs was measured to test whether the floor deck met the thermal insulation requirements. In terms of fire resistance, What is the positive bending moment resistance capability of the stage. The structure and use of floor decking. Floor decking profiles are 0.8mm, 1.0mm, and 1.2mm wide, 688mm~940mm wide, and 51mm~76mm high. Engineering floor decking and reinforced concrete structures work together and are composite structures. . The floor decking slabs are laid and connected to the steel beams. The ends of the slabs are penetrated and spot welded to the steel beams. Bolts are used to penetrate and weld the steel beams in the middle. The floor decking slabs are connected with special clamping pliers to bite and press holes. The plugs are made with special Spot welding of galvanized plug plates to floor decking and steel beams. If the special-shaped floor decking with arc area is cut using a plasma cutting machine, the cut will be smooth and the galvanized layer on the surface will be complete. The floor decking plate is welded using manual arc spot welding. The welding rod is E4303 with a diameter of 3.2mm and a penetration welding point of 16mm. The original design of the welding spot spacing was 305mm. Later, the welding spots were doubled to ensure that the floor decking plate is not blocked when the operator walks. Deformation, no grout leakage from the end of the floor deck when concrete is poured. When the elevation of the floor structure changes inconsistently, measures are taken to add welded steel to make the horizontal structure transition into steps. When the elevation is lowered, welded angle steel is added to the web of the I-beam; when the elevation is raised, welded channel steel is added to the flange of the I-beam. When encountering a reserved opening on the floor, the size is generally larger than 500mm×500mm. When the hole is opened first, measures are adopted, that is, welded steel joists are added to the steel beams to separate them to increase the stiffness of the opening. The mesh steel bars are disconnected at the opening and connected with the opening. Section steel welding; when the opening size is less than 500mm×500mm, post-opening measures are taken, that is, adding plugging and dividing plates on the floor deck, mesh steel bars are connected, and the steel bars can be cut after the concrete is poured and formed. Precautions for installation of the floor deck steel structure column mesh The spacing is generally 5~9.0m×8~15m, the spacing between secondary beams is 3m, and the cutting length of the floor decking is 4.97~8.97m. Transportation and installation are difficult, especially when the floor decking is lifted vertically from the arc area. It is difficult to thread the sleeve between the secondary beams from top to bottom, and it disrupts the normal process of secondary beam welding. Controlling the cutting length to 3~6m can avoid the problem of being unable to be lifted between secondary beams during vertical transportation. Special soft slings are used when lifting floor deck slabs.
Every time you lift, check whether the soft sling is torn or cut. Probes should be prevented when floor decking is resting on steel beams. Operators should wear safety belts when laying materials and ensure that they are fixed on the surrounding safety ropes while laying. Penetration spot welding is used for welding connections. Before welding, leftover materials should be prepared for arc test welding and the welding current should be adjusted. Since there is no horizontal formwork and vertical support at the bottom of the floor deck, the cloth should not be too concentrated when pouring concrete. Use a flat vibrator in time. Divide the vibration. Installation process of deck deck The construction process of floor deck is roughly as follows: elastic line → board cleaning → lifting → board layout → cutting → pressing → side welding → end welding → leaving holes → sealing → acceptance → studs → Laying reinforcement → embedding parts → pouring → curing. Of course, so many processes are inseparable from good labor organization. The following processes can also be handled separately according to the actual situation on site. The labor organization should be divided into two groups. The first group is responsible for transporting materials, including cleaning and unloading, until the floor decking is accurately lifted to the construction site according to the construction progress. There are 5 people including the crane; the second group is responsible for laying. Including laying reinforcement, cutting, installation and leaving holes. Each group of three people is responsible for one section, and four groups work at the same time on the same operating level. When the next process is tying steel bars and pouring concrete, special personnel should be assigned to strengthen the maintenance of the laid floor decking. The specific method is: (1) First pop up the center line of the steel beam in the paving area. The center line of the main beam is the control line for the fixed position of the floor deck slab. The center line of the main beam controls the overlap width of the floor deck and the steel beam, and determines the location of the penetration welding between the floor deck and the steel beam. The centerline of the secondary beam will determine where the penetration weld studs will be welded. Since it is difficult to observe the specific position of the secondary beam flange after the floor decking is laid, the center line of the secondary beam and the width of the secondary beam flange should be rebounded on the center line of the main beam. When fixing the bolts, the center line of the secondary beam and the width of the secondary beam flange should be adjusted. Then it bounces back to the floor deck on the secondary beam surface. (2) Clear out the layered partitions of floor decking boards at the stocking site according to the material list, and indicate the number. Clearly distinguish the layers, areas, and numbers, mark them with a marker, and accurately transport them to the designated construction site. (3) Use special soft slings when lifting to ensure that the floor decking panels do not deform as a whole and do not curl locally. Multi-story steel structures generally use a 3-story one-column installation process. (Needless to say, single-story structures) When installing floor decking, it should be constructed simultaneously with the steel structure columns and beams, and there should be at least a 3-story difference. Therefore, when lifting the floor deck slab, the sleeves can only be inserted between the beams and columns on the upper floor, and the lifting work should be controlled between the beams and columns in layers. (4) Use a plasma cutting machine or wrench shears to cut the corners. The margin when cutting and laying out should be controlled within 5mm. Measures should be taken when pouring concrete to prevent slurry leakage. (5) The connection between the floor decking board and the side panels of the floor decking board is pressed using bite pliers, so that the single floor decking boards are connected into a whole board. First, spot weld the sides of the floor decking, then fix the two ends, and finally fix it with bolts. (6) Strengthen concrete maintenance.
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