Installation of the installation platform and removal of the grid (1) The scaffolding installation platform uses full house red scaffolding. Technical requirements: step distance 115m, plant spacing 210m, each layer height should not exceed 6m, local bearing capacity is 1t per point, 300400kg per square meter, scaffolding height is 300mm high and low under the grid, the work surface is covered with scaffolding board And locked.
(2) Demolition of roof slabs and steel trusses While the scaffolding is erected, the roof slabs are removed simultaneously. After the scaffolding installation platform is set up, the steel truss and the grid support are cut by gas welding, and the gird support is removed.
(3) Demolition and installation of the grid (2) Renovation of the furnace at least 4a overhaul 1 time, the cost is about 200,000 yuan, an average of 50,000 yuan per year. The original boiler is overhauled once a year, and the cost is about 550,000 yuan. In comparison, the annual overhaul cost is about 500,000 yuan.
(4) The installation of the insulating glass roof of the insulating glass is started when the fireproof coating is applied after the grid is installed.
Grid engineering material selection and processing production procedures (1) high-frequency welded steel pipe used for grid rods, seamless steel tubes and steel plates are made of Q235 steel specified by ordinary carbon steel technical conditions GB700) 990, and the tensile strength is guaranteed. , elongation, yield point and carbon phosphorus limit content.
(2) No grain nut (3) 40Gr steel specified in GB3077)880 for high-strength bolts and fastening screws. (4) Cone head, sealing plate, and non-ribbed nut (5) The welding rod adopts the E4303 and E5016 welding rods specified by the low carbon and low alloy high strength welding rods. (6) The materials used in the grid have a factory certificate, and the MA-level test station issues a physical and chemical test report and a warranty certificate provided by the steel mill. (7) All parts of the bolt ball node grid are processed and manufactured in the factory. Processing sequence: According to various specifications, material y, y processing, y polishing, rust removal, second-degree anti-rust primer. Bolt ball 45 steel forging type, using special fixtures on the lathe to complete the bolt hole processing of various geometric angles, high-strength bolts use Jiangdu high-strength bolt factory products, and the rest of the parts are self-processing. Selection and production of lighting roofing materials (1) Select 5mm transparent float glass from Qinhuangdao Yaohua Glass Factory, cut according to the specific size and hang into the cleaning tank to clean, dry the laminated glue, first make laminated glass, add aluminum box The rubber and glass original sheets are rushed into the inert gas and sealed with waterproof tape. The whole production process is completed in the factory and is transported by steam to the construction site. (2) According to the fire protection level of the building, the TF)1 special waterproof coating and the fireproof time limit of 015h are adopted for the second-level fireproofing requirements. The construction of the fireproof coating is carried out synchronously with the installation of the grid and the steel structure. Construction method (1) The installation of the bolt ball node grid is installed by the high-altitude bulk splicing method, and the construction starts to extend to the other end along the longitudinal end of the building. (2) Node installation sequence: first install the lower string node, then install the upper string node, first assemble the intermediate node, and extend to both sides. (3) Column installation sequence: first install the lower chord, then install the chord and the belly rod. After the lower string node is assembled, the upper string ball is mounted on the two webs and one upper string to form a herringbone assembly, and then assembled with the lower string node. (4) During the assembly process, it is not advisable to tighten the bolts once. It is necessary to install one or two rows of grid strip units along the lateral direction of the building. After accurate measurement and correction, all the high-strength bolts can be tightened into place before continuing. Installation, during which the axis position, elevation and vertical deviation should be checked at any time. If it is found to be larger than the allowable deviation of the construction process, correct it in time. (5) During the whole process of installation and removal of the grid, the rods should be carried out under non-stress conditions. In order to prevent the individual support points from being concentrated under the process of dismantling, according to the self-weight deflection value of each structure at the support points, the partition is adopted. The support point is removed in stages or reduced by an equal step of no more than 10mm. After the grid is installed, the size and elevation should be measured. After the verification is correct, the support is temporarily fixed. After the roof load is added, The support bolts can be fixed and the support plate and the civil pre-embedded plate welded. (6) Install the support on the upper chord, tighten the bolts, weld the rafters and start to install the insulating glass. The installation sequence is symmetrical from the side to the middle. The hollow glass is fixed with double-sided tape, and the silicon enamel structural adhesive is filled inside. The solidification period is 21d, the butt glass joint is 15mm, the sponge rod is filled, and the silicon sponge is used to fill the air seal. The solidification period is 10d, and the V-shaped aluminum strip is coupled with the frame in the longitudinal direction to form the roof. Conclusion Because the bolt ball node grid can be removed and the construction position is moved, the engineering transformation is completed in only 15 days, and the original rods are used, and the bolt ball is more than 70%. After the acceptance of the relevant departments, the quality meets the requirements.
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