How to issue a billboard security test report - Database & Sql Blog Articles

High-power led lamp beads 1W white light Sanan 30mil high power LED lamp beads imitation lumens

How to issue a billboard security test report;
How to issue a billboard safety test report, the safety of outdoor billboards is mainly concentrated in these aspects: most of the roof billboards are only supported by several angle irons or steel pipes, fixed on the floor with expansion bolts; Large column outdoor billboards, considering the vertical load, but not considering the horizontal load, so even if there is a large pedestal, it is still blown down when the wind is strong; the billboards in the field, with the current air quality of Hangzhou, In the past two years or so, its wind resistance has been reduced by about half, but this problem has not caused the relevant departments to pay attention to prevent the billboards from falling into the wind. The competent authorities should do a good job in the security review system. The important thing is to design the source. Prevent. Companies adhering to the "sincere solidarity, diligence and self-discipline, efficient and high quality" purpose of serving the community. The company has strong technical strength and reasonable professional structure. It has a group of high- and medium-level technical titles who have long been engaged in architectural design, building construction, building structure safety appraisal, quality inspection and structural reinforcement. They have identified the structural safety of houses. With rich experience in quality inspection and structural reinforcement, it is competent for all types of housing safety appraisal. The company adopts advanced testing instruments and equipment at home and abroad, provides quality services to customers according to the current national standards, and conducts structural safety testing and identification for the “five no” projects in accordance with the relevant documents issued by the Guangdong Provincial Construction Department. At the same time, our company also specializes in housing safety appraisal in civil litigation for municipal, district-level courts and municipal arbitration committees. The company has strong technical strength and reasonable professional structure. It has a group of high- and mid-level technical titles who have long-term experience in building design, building construction, building structure safety appraisal, quality inspection and structural maintenance and reinforcement. Among them: 4 senior engineers in building construction technology, 1 national registered construction engineer, 1 national second-class registered architect, 5 professional building structural engineers); 6 persons holding national accreditation qualification certificates, holding level 1 4 persons in the structural engineering appraisers qualification certificate. How to issue a billboard safety test report, Shenzhen Zhongzheng Engineering Technology Co., Ltd. is dedicated to serve you, undertake the national business scope, provide free technical consulting services, contact telephone, 15999691719 Li Manager

First, how to issue a billboard security test report - the main content of billboard security detection:

(1) Material strength testing;

(2) Connection. The inspection of the quality and performance of the billboard structure can be divided into welding connections, welding studs (bolt) connections, bolted connections, high-strength bolting and other items.

(3) Steel component size and deviation.

(4) Defects, damage and deformation. The inspection of the appearance quality of steel can be divided into uniformity, whether there are interlayers, cracks, non-metallic inclusions and obvious segregation.

(5) Construction. For the detection and calculation of the slenderness ratio of the rod, the size of the rod can be measured according to the regulations, and the slenderness ratio of the rod should be calculated in actual size.

(6) Painting. The quality of steel structure protective coatings shall be tested in accordance with the relevant national product standards for coating quality.

(7) Billboard dynamics. The billboard can be dynamically tested to obtain parameters such as the frequency and amplitude of the vibration to analyze the dynamic characteristics between the billboard and the building.

(8) Safety identification. According to the above test results, the safety appraisal is carried out according to the "Technical Regulations for Outdoor Advertising Facilities" CEC S1482003.

(9) For the billboards standing on the roof of the building, in addition to the detection of the above items, the review of the carrying capacity of the original roof structure should be carried out, and the design review and construction quality of the connection measures between the billboard and the original building roof should be carried out. Detection.

Second, how to issue a billboard safety test report - the design of the steel structure is the most important link, which directly determines the safety of the entire steel structure. The outdoor billboard steel structure requires a qualified design unit to design.

The loads on the outdoor billboard structure are divided into permanent loads and variable loads. The permanent load has the influence of structural weight, weight of attachment, water buoyancy, soil weight of landing billboard, earth pressure or foundation deformation on structural bearing capacity. Variable loads have wind loads, frequent earthquake loads, installation or maintenance loads, temperature changes, etc. The load on the outdoor billboard shall be as specified in the Code for Loads of Building Structures GB50009. For outdoor billboard design, the following load combinations should be selected based on the possible simultaneous loading:
Combination I: Combination of variable and permanent loads.
Combination II: During the construction phase, it should be combined according to possible construction loads (such as structural weight, scaffolding, material tools, crowds, wind, etc.).
Combination III: Gravity load combined with seismic load.
The wind load is the main variable load of the outdoor billboard structure, and the collapse of the main outdoor steel structure billboard is caused by the wind load. The wind load standard value Wk per unit area at the height z acting on the outdoor billboard structure is calculated as follows:
Wk = βzμsμzW0
Wk—the standard value of wind load (kN/ m2);
Wo———Basic wind pressure (kN/ m2);
Zz————the wind vibration coefficient at height z;
Ss—the wind load shape factor;
Zz———The coefficient of variation of wind pressure height at height z.
The floor billboard structure should consider the influence of wind vibration caused by the pulsating wind. When the basic natural vibration period of the structure is less than 0.25s, the wind vibration effect may not be considered. The billboard on the wall of the building should be integrated with the building to consider the influence of wind vibration. In addition to the wind vibration effect of the building, the billboard on the roof of the building should also consider the basic self-vibration period of the billboard itself to check its wind-induced vibration. The calculation of seismic action can be carried out in accordance with the provisions of GB 50011 of the Code for Seismic Design of Buildings. Outdoor billboard steel structures with an earthquake fortification intensity of 7 degrees must be seismically designed. In particular, roof billboards and wall billboards for high-rise and multi-storey buildings should consider earthquakes together with buildings when conditions permit. For the overhanging structures such as cantilever trusses and cantilever beams of billboards, vertical seismic action should also be considered. The selection, arrangement and construction of the outdoor billboard steel structure should be easy to manufacture, install, and maintain safely, and make the structure stress simple and clear, reducing stress concentration. The outdoor billboard steel structure is mainly subjected to wind loads, and a structure with a small wind receiving area should be adopted. The minimum wall thickness of steel plates (steel pipes, channel steels and flat steels) used for billboards exposed to outdoor environments shall not be less than 3 mm, and the diameter of round steel used shall not be less than 10 mm. If the welded members are welded, the angle steel used shall not be suitable. Less than ∟45×4 or ∟56×36×4, the bolted angle steel should not be less than ∟50×5. The outdoor billboard structure should be based on the structural form and the load it is subjected to to provide a reliable support system to ensure the overall stability of the structure. In the Technical Regulations for Outdoor Advertising Facilities Steel Structure (CECS148-2001): Floor-mounted billboard steel structure, under the action of wind load (standard value), the horizontal displacement of the apex of the structure should not exceed 1/100 of the height of the point. The allowable deflection of the beam is L/150 (L is the beam span). Wall-mounted billboard steel structure, under the action of wind load (standard value), the allowable deflection of the cantilever beam is L/150 (L is the length of the cantilever). For various forms of billboard steel structures, when using a flat or space frame structure, the length-to-thin ratio λ of the members shall not exceed the following provisions: pressure chord, diagonal rod, cross rod: 150; auxiliary rod: 200; Tie rod: 250; structural calculation of outdoor steel structure billboards, such as manual calculation, long cycle, labor intensity, there are many mature steel structure computer processing software, such as 3D3S, ANSAY, etc., such software can be directly The steel structure model is built by computer, and the load condition is input, and the force state of each component is conveniently and intuitively calculated to judge the rationality of the material selection.

Third, how to issue a billboard security test report - what is the LED billboard:
LED Emitting Diode (LED) is a solid-state semiconductor device that can directly convert electrical energy into light. It changes the principle of tri-color toner illumination of incandescent tungsten filament and energy-saving lamps. Glowing. LEDs have become a high-profile new generation of light sources with their incomparable characteristics of traditional lighting fixtures, and are known as promising green lighting sources.
2.1 Advantages of LEDs 1 Energy-saving Traditional lamps can generate a large amount of heat energy when they are energized, and consume a large amount of electricity. LEDs can convert all electrical energy into light energy without causing energy waste, and the energy utilization rate can reach 80%. The LED is a cold light source, and the node efficiency is very obvious compared with the conventional incandescent lamp and fluorescent lamp. A 10 to 12 W LED light source emits light energy comparable to that of a 35-150 W incandescent lamp. The same lighting effect, white LED energy consumption is 1/10 of incandescent lamps, 1/4 of energy-saving lamps, in contrast, LED light sources are 80% to 90% more energy efficient than traditional light sources.
2 Long life LED is a solid-state semiconductor device. Unlike traditional incandescent lamps, there are no wearing parts such as glass and tungsten wire. The lamp body itself uses epoxy resin, which is stronger and stronger than the traditional glass, even if it is strongly collided. It will not be easily damaged and the failure rate is extremely low. The service life of LED lamps is up to 100000h or more, which is several times or even several times that of general light sources. It can be used for a long time without replacement, saving labor and related expenses, and is more suitable for places that are difficult to replace, which brings great convenience.

Fourth, how to issue a billboard security test report - the company undertakes the following national business scope:
1. Safety appraisal before renting a house (for lease contract)
2, the house changes the use of safety identification and change the use of functional identification
3. Industrial plant safety appraisal
4. Safety appraisal of house quality
5. Judicial arbitration commissioned identification
6, building renovation and reinforcement
7. Demolition of house safety appraisal
8. Building foundation bearing capacity, seismic identification
9. Safety appraisal of house decoration and decoration
10. Safety appraisal of construction surrounding houses
11. Identification of the age of the building
12. Identification of buildings after the disaster
13. Modern building identification
14. Detection and identification of “five no” engineering buildings
15. Evaluation of house damage level and identification of house safety accidents
16. Anti-seismic testing of schools and kindergartens

The company publicly promises to the society: correctly perform administrative functions, meet the needs of the society, provide reliable testing data to the society with rigorous, realistic, objective, fair, scientific and accurate attitude, and comprehensively ensure high-tech means, professional standards and good occupations. Morality provides fair, equitable, scientific, accurate, high-quality and efficient technical services to the society; strictly enforces relevant laws, regulations, norms, standards and working procedures; we will provide you with the most professional prices and the most enthusiastic service. The most reasonable test and appraisal report issued by the test and appraisal report has impartiality and legal effect; we are now dedicated to providing customers with various types of housing appraisal and testing technical services.