Floor slab (steel bearing plate, building profiled steel plate) is made of galvanized steel plate by cold rolling, and its cross section is V-shaped, U-shaped, trapezoidal or similar. It is mainly used as a permanent template, but it can also be used for other purposes. It is called composite floor slab, floor slab, steel bearing slab, profiled steel plate, floor slab, steel floor slab, composite floor slab, galvanized steel bearing slab, galvanized floor slab, composite floor slab, architectural profiled steel plate, composite floor slab, etc. , can also be divided into: open floor, fully enclosed floor, dovetail floor (also called necking) 2. In the use stage, the bearing plate, as the tensile reinforcement of the concrete floor, also improves the stiffness of the floor and saves the amount of reinforcement and concrete. 3. The embossing on the surface of the pressure plate makes the bearing plate and concrete have the greatest binding force, making them form a whole, and with the stiffening ribs, the bearing plate system has high strength. 4. In the cantilever state, the bearing plate is only used as a permanent template. The length of cantilever can be determined according to the section characteristics of floor. In order to prevent the cantilever plate from cracking, it is necessary to provide negative reinforcement at the support according to the design of the structural engineer. 5. The floor of our company has passed the fire resistance limit test of the national fixed fire extinguishing system and the fire resistance component quality test center. As a composite floor, there is no need to spray fire, which greatly reduces the engineering cost. Products and applications are widely used in power plants, power equipment companies, automobile exhibition halls, steel structure factories, cement warehouses, steel structure offices, airport terminals, railway stations, stadiums, concert halls, grand theaters, large supermarkets, logistics centers, Olympic venues and other steel structure buildings. Product test A, dynamic load test, qualified floor needs to go through multiple groups of dynamic load tests to get the shear bond coefficient of composite plate, test the bond ability between floor and concrete, and get the design load it bears on a large span. B, fire resistance test, using three groups of floors to do 1.5 hours, 2 hours and 3 hours loading fire resistance test in the fire resistance laboratory, and measuring the temperature distribution in the floor at the same time to test whether the floor meets the heat insulation requirements and how the positive bending moment resistance is in the fire resistance stage. Structure and application of floor slab profiles are 0.8mm thick, 1.0mm wide, 1.2mm wide, 688mm~940mm high and 5 1mm~76mm high. The floor slab of the engineering floor works together with the reinforced concrete structure, which is a composite structure. Laying a floor slab and connecting it with a steel beam, wherein the end part of the floor slab is welded with the steel beam through penetration spot welding, and the middle part of the floor slab is welded with the steel beam through penetration; The connection of floor bearing plate adopts special clamping pliers to bite the hole; The galvanized insert plate for the plug is spot-welded with the floor and steel beam. If the plasma cutting machine is used to cut the special-shaped floor in the arc area, the incision is smooth and the galvanized layer on the surface is complete. Floor welding adopts manual arc spot welding. The covered electrode is E4303, with a diameter of 3.2mm, and the penetration solder joint is 1 6 mm. The original design solder joint spacing is 305mm, and then the solder joint is increased to1times, so as to ensure that the floor slab will not deform when the operator walks and the end of the floor slab will not leak slurry when concrete is poured. When the elevation of the floor structure changes inconsistently, the measures of welding steel bars are taken to make the horizontal structure gradually transition. When the elevation decreases, the I-beam web is welded with angle steel; When the elevation rises, the I-beam flange is welded with the channel steel. When there are reserved holes in the floor, and the size is generally greater than 500mm×500mm, the first opening measure is adopted, that is, welding steel joists on steel beams to increase the rigidity of the hole, disconnecting the steel mesh at the hole and welding with the steel beams; When the size of the hole is less than 500mm×500mm, the post-opening measures shall be taken, that is, a plug partition plate shall be added on the floor, and the steel mesh can be penetrated. After concrete pouring, steel bars can be cut off. Matters needing attention in floor slab installation are generally 5~9.0m×8~ 15m, the spacing between secondary beams is 3m, and the blanking length of floor slab is 4.97~8.97m, which makes transportation and installation difficult, especially in areas with circular arcs. The blanking length is controlled at 3 ~ 6 m, which can avoid the problem that it cannot be hoisted between secondary beams during vertical transportation. Special soft slings are used to lift the floor. Check whether the soft sling is torn or cut off every time it is hoisted. When the floor is placed on the steel beam, the probe should be prevented. When laying materials, operators should wear safety belts and ensure that they are fixed on the surrounding safety ropes during laying. Welding adopts penetration spot welding connection. Before welding, leftover materials should be prepared for arc trial welding, and the welding current should be adjusted. Because there is no horizontal formwork and vertical support at the bottom of the floor slab, the cloth should not be too concentrated when pouring concrete, and the flat vibrator should be used to share the vibration in time. Installation process of bearing plate The construction process of bearing plate is generally as follows: elastic thread → plate cleaning → lifting → plate laying → cutting → pressing → side welding → end welding → leaving holes → plugging → acceptance → vertical bar laying → embedded parts → pouring → maintenance. Of course, so many processes are inseparable from good labor organization, and the following processes can also be handled separately according to the actual situation on site. The ILO should be divided into two groups. The first group is responsible for transporting materials, including clearing and transshipment, until the floor is accurately hoisted to the construction site according to the construction progress, including five riggers; The second group is responsible for laying, including reinforcement, cutting, installation and leaving holes. Every three people are a group, responsible for an internode, and four groups work at the same operational level at the same time. When the steel bar is bound and concrete is poured in the next working procedure, assign special personnel to strengthen the maintenance of the laid floor slab. The concrete method is as follows: (1) First, the center line of steel beam pops up in the floor laying area, and the center line of main beam is the control line for laying the floor at a fixed position. The center line of the main girder controls the lap width of the floor slab and the steel beam, and determines the welding spot position of the floor slab and the steel beam. The center line of the secondary beam will determine the welding position of the penetration welding stud. Because it is difficult to observe the specific position of the flange of the secondary beam after the floor is laid, the center line and flange width of the secondary beam should be bounced back to the center line of the main beam, and the center line and flange width of the secondary beam should be bounced back to the floor on the surface of the secondary beam when fixing the studs. (2) In the stacking area, the floor shall be cleaned by layers and partitions according to the bill of materials, marked with numbers, and the layers, areas and numbers shall be clearly distinguished, marked with a marker pen and accurately transported to the designated construction site. (3) When hoisting, use special soft slings to ensure that the floor slab is not deformed as a whole or curled locally. For the design of multi-storey steel structure, the installation process of three-storey and one-section column is generally adopted (not to mention single-storey steel structure). When installing the floor slab, it should be constructed synchronously with the steel structure column beam, with a difference of at least three layers. Therefore, the floor can only be hoisted between the upper beams and columns, and the hoisting operation should be controlled in layers between the beams and columns. (4) using plasma cutting machine or shearing machine to cut corners. When cutting unreeling, the allowance should be controlled within 5 mm, and measures should be taken to prevent slurry leakage when pouring concrete. (5) The joint between the floor slab and the floor slab side plate is pressed by occlusal pliers, so that a single floor slab is connected into a whole floor slab. Spot weld the side of the floor first, then fix the two ends, and finally fix them with bolts. (6) Strengthen concrete curing.
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