Bolt round node frame engineering quality supervision system
The main points of the quality control of the grid project; the determination of the grid manufacturer: Because the general architectural design unit is responsible for the selection and design requirements of the grid, the grid manufacturer is responsible for the technical design of the grid, determining the materials, responsible for the production, construction and installation. Quality, so the determination of the grid manufacturers has a great impact on the quality of the project. The inspection of the manufacturers focuses on: qualification review; the manufacturer's process and its main production equipment; design capability and product quality assurance system; product testing methods. Prepare the work before the start of the project; strengthen the impact of the quality of the work process of the construction drawings. Review the design of the grid installation and construction organization. The key contents of the review are: the establishment of quality assurance system and technical management system; training certificate and employment certificate for special types of work; application of new technology.
The quality control of the grid material strengthens the access control of the grid engineering materials. The processing of the mesh structure parts has been factory-produced, and the acceptance quality of the steel components is very important. The components enter the site in addition to checking the quantity according to the schedule, and the quality control of the appearance sensory, geometric size, and the certificate inspection grid installation; construction Standard implementation, in which the pre-embedded bolts in the foundation are the focus of quality control, the spacing between the individual bolts and each set of bolts, the height deviation, directly affects the installation quality of the grid project. During construction, as far as possible during the construction of the main structure, the pre-embedded parts will be buried in time with the civil construction. Specifically, before the concrete is poured, the bolt set is accurately positioned by the theodolite, and the main ribs of the column are welded with the steel bars, and the bolts are protected at the same time. Thread buckle to prevent damage during concrete pouring; pay attention to the characteristics of the components and the main structure, expansion joints, lightning protection grounding for hidden inspection.
Quality control of the main structure of the grid. Control of bolt mounting quality. High-strength bolts and ordinary bolts are generally used for bolting in grid construction. For ordinary bolt connection, no more than two gaskets shall be placed on one end of each bolt. The bolt holes shall not be reamed with gas. After the bolts are tightened, the exposed threads shall not be less than two and the expansion control. Before the grid is painted, the surface of the brushing member shall not have foreign matter such as welding slag, oil stains, water and burrs. The number and thickness of the brushing shall comply with the design requirements.
When the net frame parts are stacked, the stacking site must be protected from rain and water, and kept dry. It should not be placed on the ground directly to prevent the components from rusting and contaminating the dirt. The loading and unloading trucks transported by the net frame should not be thrown to prevent collision. Bad components and paint; components should be rusted before installation. Quality control of roofing panel installation. The seam is made waterproof. Measurements should be performed after the grid is completed. The specific inspection standard is: the longitudinal and lateral length deviation of the grid is ≤±L/2000, and ≯30mm; the center bearing offset is ≤L/3000.
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