First, the construction of ordinary fasteners:
1) For ordinary bolts used for permanent connection, when there is doubt about its quality or special requirements for design, it should be witnessed and sampled for re-inspection. The results of the re-inspection report should conform to the current national standard "fastener mechanical performance bolts, Screws and studs, GB3098.
2) The specifications of the rivets, nails and self-tapping screws used for the connection of thin steel plates shall be consistent with the connecting steel plates. The margins and spacing shall comply with the design requirements and standards.
3) When using ordinary bolts for permanent connection, it should be firm and stable and the external thread buckle should not be less than 2 buckles; the connection of self-tapping screws, nails and steel rivets and steel plates should be tightly packed and neatly arranged.
2. Before the steel structure is fabricated and installed, the construction unit shall re-test the anti-slip coefficient of the high-strength bolt-connecting friction surface. The treated friction surface shall be tested separately, and the test results shall meet the design requirements.1) The final tightening torque should be checked within 48 hours after the high-strength hex bolt connection is twisted. The result should meet the requirements of Appendix B of the specification GB50205-2001; the number of torsion-cut high-strength bolts is not twisted after the final screw is twisted. Should be greater than 5% of the total number, and make a record.
2) The torque of the high-strength bolt connection pair shall comply with the requirements and design requirements of the national standard JGJ82. After the final screwing, the exposed bolts shall be controlled at 2-3 buckles, and the number of exposed threads 1 and 4 buckles shall not exceed 10%.
3) The friction surface of high-strength bolts shall not have defects such as dirt, iron oxide, welding smash, spatter, burr, etc.; bolt holes shall not be applied by electricity or gas welding, and the hole diameter shall not exceed 1.2d (d is the diameter).
4) The connection between the high-strength bolt and the ball joint used in the grid should be firm, and the depth of the screw in the ball should not be less than 1.0d. There should be no looseness or cracks at the joint.
5) All parts are not allowed to be thrown when working at height, to avoid falling and hurting people; to do anti-rust treatment in time after screwing, in the open air or in the environment affected by corrosive gas, the gap should be waterproof and anti-corrosion treatment.
6) It should be checked whether the friction surface meets the design requirements, whether the bolts and apertures used meet the design requirements, and it is strictly forbidden to use the high-strength bolts as temporary mounting bolts.
Opical Fiber Concrete which is New, safety and high quality
* Low-loss optical window in the light-visible area, and ability to transmit visible light from end to end, but not including ultraviolet or infrared light
* The impression given by traditional concrete is always murky, but this dark-colored, lifeless concrete may be about to become a thing of the past. combining traditional concrete with fiber optics cable can produce transparent concrete. Combining the fair-faced concrete technology with light-guiding materials, through product research, the light-transmitting concrete is made into garden building products, decorative plates, decorative blocks, transparent concrete bricks, wallboards, etc
* As long as the light is shining on one side of the light-transmitting concrete (monochromatic light or 7 color light), it will be able to see these lights (non-guided infrared light) from the other side of the concrete. These lights can be both chaotic and heavenly like the star in the sky; it also can be arranged in different shapes according to actual needs, such as characters, text, drawings, etc.. Because the concrete itself has solid, heavy-duty, thermal insulation, light and transparent materials, and concrete composite can be made into garden construction products, decorative plates, decorative blocks, can also be used to make a variety of building materials.
* Light-transmitting concrete has a good working performance and a wide application prospect, as follows:
- Light transmission concrete light guide material is evenly distributed and has good light transmission performance. It can transmit visible and infrared light of different wavelengths, which greatly saves the general architectural lighting loss. It is a kind of green and low carbon building material. Works of different textures and colors have significant architectural energy-saving and decorative effects.
- Light-transmitting concrete has good thermal insulation properties and is used in accordance with related materials. It can be used in indoor fire escape, night guidance, and other special fields, and improves the safety of buildings, especially high-rise buildings.
- Compared with ordinary concrete, the light-transmitting concrete's bending strength is greatly improved, and various shapes can be made according to building requirements, which expands the practicality and applicability of building materials.
- Light-transmitting concrete This type of wall itself has a high appreciation value. It has great potential for application in hotels, restaurants, villas, and other buildings that require decoration, and provides a material basis for further improving the architectural aesthetic effect.
* No conductivity or heat transfer(Through the fibers no electrical power is sent, they remain always cold )
* Reduced energy cost
* No electrical hazard
* Long life-time
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