Structure and Design:
1, when selecting the steel structure of outdoor advertising facilities, the requirements of steel structure production, transportation, installation and concrete construction should be considered, as well as the impact of the architectural shape and maintenance of advertising facilities on the city environment after completion.
(2) The design and construction of the steel structure of outdoor advertising facilities shall not destroy the structural safety and use function of the attached buildings and structures. During the design, the safety of the original structure should be checked and an evaluation conclusion should be made.
3, the safety level of outdoor billboard structure can be divided into three levels:
(1) in an important position, or important advertising, or the service life of more than 20 years for the first class billboard;
(2) The second-important advertisement in the second-important position, and the service life of more than 5 years is the second-level billboard;
(3) Located in an open space, the personal danger is small when destroyed, the importance of advertising is small, and the service life is not more than 5 years.
(4) The selection, layout and construction of outdoor billboard steel structure should be easy to make, install and maintain, and make the structure single and clear to reduce stress concentration. Outdoor billboard steel structure mainly bear wind load, it is appropriate to use a fasting structure, and strive to reduce the wind area.
(1) The minimum wall thickness of the section steel (steel pipe, channel steel, flat steel) used in the outdoor environment should not be less than 3mm, the diameter of the round steel should not be less than 10mm, the Angle steel of the welded structure should not be less than L45X4 or L56X36X4, and the Angle steel of the bolted connection should not be less than L50X5.
(2) The outdoor billboard steel structure should be designed according to the structural form and the load it is subjected to reliable support system.
5, outdoor advertising facilities steel structure design and construction, in addition to the implementation of the provisions of this code, Still should comply with the current national standards “building structure load code” GB 50009,((steel structure design code “GB 50017,(concrete structure design code” GB 50010, “foundation design code” GB 50007, “building seismic design code” GB 50011 and other relevant provisions. The acceptance of materials and construction quality shall meet the requirements of the current national standard “Code for Acceptance of Construction Quality of Steel Structure Engineering” GB 50205,(Code for Acceptance of construction quality of Concrete structure engineering “GB 50204. Lightning protection and grounding in addition to complying with the provisions of the current national standard “lightning protection Design Code for buildings” GB 500057, should also comply with the city management regulations and outdoor advertising Settings planning and management methods.
Acceptance check
< 1 > Basic Regulations for acceptance:
1. The construction quality acceptance of steel structure engineering shall be carried out on the basis of the self-inspection of the construction unit, according to the inspection batch, sub-project, and sub-division (sub-division) project. The division of sub-projects in the steel structure division (sub-division) project shall be implemented in accordance with the provisions of the current national standard “Unified Standard for Acceptance of Construction Quality of Construction Projects” GB 50300. The sub-project of steel structure shall be composed of one or several inspection batches, and the inspection batches of each sub-project shall be divided according to the provisions of this code.
2. The construction unit of the steel structure project shall have the corresponding qualification for the construction of the steel structure project, the quality management of the construction site shall have the corresponding construction technical standards, quality management system, quality control and inspection system, and the construction site shall have the construction organization design, construction plan and other technical documents approved by the project technical leader.
(3) The acceptance of the construction quality of the steel structure project must adopt the measuring instruments that have been verified and calibrated.
4. When the construction quality of steel structure engineering does not meet the requirements of this code, it shall be dealt with in accordance with the following provisions:
(1) The inspection lot of the rework or replacement of the structure (assembly) shall be re-accepted;
(2) The inspection batch that can meet the design requirements detected by a qualified testing unit shall be accepted;
(3) The test and identification of qualified testing units do not meet the design requirements, but the inspection batch that can meet the structural safety and use function can be accepted by the original design unit;
(4) After repair or reinforcement treatment of sub-items and sub-projects, although the shape of the changed size but still meet the safety requirements, can be accepted according to the treatment of technical plans and negotiation documents.
(5) The steel structure division project that cannot meet the requirements of safe use through repair or reinforcement treatment is strictly prohibited from acceptance.
5. Construction quality control of steel structure projects shall be carried out in accordance with the following provisions:
(1) The raw materials and finished products used shall be accepted on site. All raw materials and finished products related to safety and function shall be reinspected in accordance with the provisions of this code, and shall be witnessed by the supervision engineer (technical person in charge of the construction unit) for sampling and sample delivery;
(2) Quality control shall be carried out in each process according to the construction technical standards, and inspection shall be carried out after each process is completed;
(3) The handover inspection shall be carried out between the relevant professional types and shall be inspected and approved by the supervision engineer (technical person in charge of the construction unit).
6. The quality standard of the sub-project inspection batch shall comply with the following provisions:
(1) The main control project must meet the requirements of the qualified quality standards of this code;
(2) The inspection results of general items should be 80% or more of the checkpoints (values) in line with the requirements of the qualified quality standards of this code, and the maximum value should not exceed 1.2 times the allowable deviation value.
7. Quality inspection records, quality certification documents and other information should be complete.
(1) The qualified quality standard of the sub-project shall comply with the following provisions:
(2) Each inspection batch included in the sub-project shall comply with the qualified quality standards of this Code;
(3) The quality acceptance records of each inspection batch included in the sub-project shall be complete.
< 2 > Steel:
1, the variety, specifications, performance of steel, steel castings should meet the current national product standards and design requirements. The quality of imported steel products shall meet the requirements of the design and contract standards. Check quantity: All checks. Inspection method: Check the quality certificate, Chinese mark and inspection report, etc.
(2) The steel belonging to one of the following circumstances should be sampled for reinspection, and the reinspection results should meet the current national product standards and design requirements.
(1) Imported steel; (2) Steel mixed batch; (3) The plate thickness is equal to or greater than 40mm, and the thick plate with Z-direction performance requirements is designed; (4) The safety grade of the building structure is level 1, and the steel used in the main stressed members of the long-span steel structure; (5) Design steel with reinspection requirements; (6) Steel with doubtful quality.
Check quantity: All checks. Inspection method Check the reinspection report.
< 3 > Coating materials:
1, steel structure anticorrosive coating, diluent and curing agent and other materials, specifications, performance, etc. should meet the current national product standards and design requirements. Check quantity: All checks. Inspection method: Check the quality certificate, Chinese mark and inspection report of the product.
2, the variety and technical performance of steel structure fire retardant coatings should meet the design requirements, and should be tested by qualified testing institutions in line with the provisions of the current national standards. Check quantity: All checks. Inspection method: Check the quality certificate, Chinese mark and inspection report of the product.
Welding materials: The variety, specifications and performance of welding materials shall meet the current national product standards and design requirements. Check quantity: All checks. Inspection method: Check the quality certificate documents, Chinese marks and inspection reports of welding materials.
