(1) Material quality requirements (1) High-strength large hexagon bolt connection pair for steel structure connection, torsion-shear type high-strength bolt connection pair, high-strength bolt for steel grid, ordinary bolt, rivet, self-tapping nail, rivet, nail, anchor bolt, Standard parts such as anchor bolts and standard fittings such as nuts and washers shall have a quality certificate or certificate. (II) Quality control during construction (1) The steel structure fabrication and installation unit shall carry out the anti-slip coefficient test and re-inspection of the high-strength bolt-joined friction surface according to the current national standard “Specifications for the Acceptance of Steel Structure Engineering Construction Quality†gb50205-2001; The friction surface of the friction surface shall be tested separately for the friction surface resistance coefficient, and the results shall meet the design requirements. When the high-strength connecting node is designed according to the pressure type connection or the tension type connection, the friction surface anti-slip coefficient test and re-inspection may not be performed.
We supply various flood light, including
mini flood light, square flood light, solar flood light etc.
The below information will help you to know
more about flood light.
Why is a flood light called flood light?
The word
'flood' has nothing to do with water. They are called flood lights because they
are flooding the area with light.
What is a flood light used for?
Flood light bulbs are specifically designed
to light outdoor areas. Flood lights work by [flooding" an area with light.
They can produce wider beams of light, usually up to 120 degrees. These area
lights are great for illuminating larger outdoor spaces while maintaining the
same wattage or lumen output as a spotlight.
What are the Best Places to Place
Floodlights?
1. Your Yard.
2. Home or Business Entrance. A floodlight
aimed at your front door keeps it bright and easy to see. ...
3. Blind Spots. ...
4. Pathways and Steps. ...
5. Parking Areas. ...
If you want to know more about the products
in Flood Light, please click the product details to view parameters, models,
pictures, prices and other information about Flood Light, Solar Flood Lights
Outdoor, Floodlight Led, Outdoor Flood Light Fixtures.
Whatever you are a group or individual, we
will do our best to provide you with accurate and comprehensive message about
Flood Light!
Flood Light,Solar Flood Lights Outdoor,Floodlight Led,Outdoor Flood Light Fixtures NINGBO LONGFLIGHT INTELLIGENT TECHNOLOGY CO.,LTD , https://www.long-flight.com
(2) High-strength large hexagon bolt connection pair and torsion-shear type high-strength bolt connection pair shall be shipped with the test report of torque coefficient and tightening axial force (prestress), and shall be randomly sampled at the site. Its torque factor and pre-stress.
(2) For high-strength bolt connection, the friction surface of the component must be processed. The anti-slip coefficient after treatment should meet the design requirements. The methods include sandblasting, spraying (polishing) pills, pickling, and grinding wheel grinding. When grinding with a manual grinding wheel, the grinding direction should be perpendicular to the force direction of the member, and the grinding range is not less than 4 times the bolt hole diameter. The treated friction surface shall be protected and shall not be marked on the friction surface. The re-inspection of the anti-slip coefficient of the friction surface shall be carried out by the production unit and the installation unit in accordance with the manufacturing batch.
(3) Common bolt connection fastening requirements:
1 Ordinary bolt fastening should start from the middle, symmetrically to both sides, and large joints should be double-threaded.
2 When the ordinary bolt is used as the permanent connecting bolt, the flat washer should be placed on the bolt head and the nut side when tightening. There should be no more than two washers on the bolt head side and no more than one washer on the nut side.
3 Permanent ordinary bolt fastening should be firm and reliable, and the exposed thread should not be less than 2 buckles. For bolted connections that are subjected to dynamic loads or important parts, when designing anti-loose requirements, a nut or spring washer with anti-loose means should be used, and the spring washer should be placed on the nut side.
(4) High-strength bolts should be freely threaded into the bolt holes, and should not be gas-cut and reamed; the maximum hole expansion should not exceed 1.2d (d is the bolt diameter).
(5) When installing high-strength bolts, install bolts and nails first, and high-strength bolts should not be used as mounting bolts.
(6) High-strength bolt fastening requirements:
1 High-strength bolts should be tightened after the component mounting accuracy is adjusted.
2 When the torsion-cut high-strength bolt is installed, the side of the nut with the round table should face the chamfered side of the washer.
When installing the three large hexagonal high-strength bolts, the side with the chamfered washer under the bolt head should be toward the bolt head. The side of the nut with the round table should face the chamfered side of the washer.
4 Torque wrench for screwing and inspection should be calibrated before the shift, after the shift, the torque accuracy error of the wrench should not exceed ± 5%; the torque accuracy error of the test wrench should not exceed ± 3%.
5 When applying the screw, apply torque to the nut.
6 The tightening sequence of the high-strength bolts shall be such that all the bolts in the bolt group are evenly stressed, and the screws are applied from the middle to the edge of the joint. The initial and final tightening shall be performed in a certain order. The bolts installed on the same day shall be completed at the end of the day, and the exposed thread shall be 2 to 3 buckles.
7 torsion-cut high-strength bolts, to end the final twist of the tail of the plum blossoms. 
Steel structure fastener connection engineering: material quality requirements and quality control of construction process