Design and Acceptance Criteria for Outdoor Display Steel Structures
Steel structure design requirements
1, outdoor advertising facilities Steel structure design and construction shall not be damaged by the attached buildings, structures, structural safety and use of functions. Design should be based on the original structure of the security check, and make assessment conclusions.
2, the choice of outdoor advertising facilities steel structure program, should consider the steel structure production, transportation, installation and concrete construction requirements, as well as advertising facilities, architectural modeling and after the completion of the maintenance of the city and the environment impact.
3, outdoor advertising facilities Steel design and construction, in addition to the implementation of the provisions of this Code, should still meet the existing national standard "building structure load specification" GB 50009, ((steel structure design specifications "GB 50017, ((concrete structure design Specifications GB 50010, "foundation design code" GB 50007, "building seismic design code" GB 50011 and so on. Materials and facilities quality acceptance should be consistent with the current national standard "steel structure construction quality acceptance" GB 50205, (Code for Construction Quality Acceptance of Concrete Structures) GB 50204. Lightning Protection and Grounding In addition to complying with the existing national standard "Code for Lightning Protection of Buildings" GB 500057, it is also necessary to comply with the regulations on urban management and outdoor advertising And management practices.
4, outdoor billboard structure of the security level can be divided into three levels:
(1) an important place, or an important advertisement, or a bill of credit for a period of more than 20 years;
(2) secondary advertisements in sub-critical locations with a useful life of more than 5 years for secondary billboards;
(3) located in the open space, the destruction of personal risk is small, the importance of advertising is small, and the use of life of not more than 5 years for the three billboards.
5, outdoor billboard steel structure selection, layout and construction should be easy to make, install, maintain, and make the structure of a single force, to reduce stress concentration. Outdoor billboard steel structure is mainly subjected to wind load, should adopt fasting structure, and strive to reduce the wind area.
(1) exposed to outdoor environment in the billboards used steel (steel pipe, channel, flat steel) the minimum wall thickness should not be less than 3mm, the diameter of the round bar should not be less than 10mm, welded steel angle should not be less than L45X4 or L56X36X4, bolts Connected angle should not be less than L50X5,
(2) outdoor billboard steel structure should be based on the structure and load the load to design a reliable support system.
LED display
Acceptance of steel structure
<A> Acceptance of the basic provisions:
1, led display steel structure construction unit should have the corresponding steel structure construction qualification, construction site quality management should have the corresponding construction technology standards, quality management system, quality control and inspection system, the construction site should be responsible for the project technology Person approval of the construction organization design, construction and other technical documents.
2, the construction of steel construction quality acceptance, must be used by the measurement test, calibration of qualified measuring instruments.
3, steel structure engineering should be the following provisions of the construction quality control:
(1) the use of raw materials and finished products should be carried out acceptance. Where the safety and function of raw materials and finished products should be in accordance with the provisions of the provisions of the reinspection, and should be supervised engineers (construction unit technical person in charge) witnessed sampling,
(2) the process should be based on construction technical standards for quality control, each process is completed, should be checked;
(3) between the relevant professional types of work should be carried out inspection, and by the supervision engineer (construction unit technical person in charge) inspection and approval.
4, steel structure construction quality acceptance should be in the construction unit self-test basis, in accordance with the inspection batch, sub-project, sub-division (sub-Division) project. Steel Division (sub-branch) project sub-project division should be in accordance with the current national standard "construction quality acceptance of a unified standard" GB 50300 implementation. The steel structure sub-project shall consist of one or several inspection lot, and the inspection items of each item shall be divided according to the provisions of this specification.
5, sub-project inspection batch quality standards should meet the following requirements:
(1) the master project must meet the requirements of the qualified quality standards of this specification;
(2) General items The test results shall have 80% and above checkpoints (values) in accordance with the requirements of the qualified quality standards of this specification, and the maximum value should not exceed 1.2 times the allowable deviation.
6, quality inspection records, quality certification documents and other information should be complete.
(1) sub-project qualified quality standards should meet the following requirements:
(2) the inspection items included in the project shall meet the quality standards of this Code;
(3) sub-project contains the inspection batch quality inspection records should be complete.
7, when the steel construction quality does not meet the requirements of this specification, should be treated as follows:
(1) reworked or replaced by the rework (with) pieces of inspection lot, should be re-acceptance;
(2) by a qualified testing unit to identify the design requirements to meet the inspection requirements, should be accepted;
(3) Qualified testing unit inspection and identification can not meet the design requirements, but the original design unit approved to meet the structural safety and use of the function of the inspection lot can be accepted;
(4) Sub-items, sub-projects, which have been reworked or reinstated, can be subject to acceptance of technical solutions and consultation documents, although they can be changed to meet the requirements of safety.
(5) through the repair or reinforcement treatment still can not meet the requirements of the safety of the use of steel structure of the project, is strictly prohibited acceptance.
<B> steel:
1, steel, steel casting varieties, specifications, performance, etc. should be consistent with the existing national product standards and design requirements. The quality of imported steel products should meet the design and contract requirements of the standard requirements. Check the number: Check all. Inspection methods: check the quality of qualified documents, Chinese logo and inspection reports.
2, the steel is one of the following circumstances, should be sampled re-inspection, the results of the re-inspection should be consistent with the existing national product standards and design requirements.
(1) foreign imports of steel;
(2) mixed steel;
(3) plate thickness equal to or greater than 40mm, and the design of the Z-performance requirements of the thick plate;
(4) building structure safety level for the first, large span steel structure in the main force used by the steel components;
(5) design of re-inspection requirements of steel;
(6) the quality of doubt on the steel.
Check the number: Check all. Inspection method Check the retest report.
<3> Welding materials:
1, welding materials, specifications, specifications, performance should meet the existing national product standards and design requirements.
Check the number: Check all. Inspection method: Check the quality of welding materials qualified documents, Chinese logo and inspection reports.
<4> Coating material:
1, steel structure anti-corrosion coatings, thinner and curing agent and other materials varieties, specifications, performance, etc. should be consistent with the existing national product standards and design requirements. Check the number: Check all. Inspection methods: check the product quality certification documents, the Chinese logo and inspection reports.
2, steel structure fire retardant coating varieties and technical performance should meet the design requirements, and should go through a qualified testing organizations to meet the relevant provisions of the current national standards. Check the number: Check all. Inspection methods: check the product quality certification documents, the Chinese logo and inspection reports.