Guangzhou Steel News: Steel Engineering steel column means test requirements
Means should be checked before entering the member list member, commodity inspection certificate and design documents; the factory pre-assembled components had assembled on site, should be based on pre-assembled record. And member to conduct a comprehensive examination, including dimensions, bolt hole location and diameter, quantity and quality fittings, weld, conflicts surface, anti-corrosion coating, etc. to check for member deformation, defect, failure, it shall be in the ground to correct, repair, processing, after passing devices.
1, lifting
According to steel column shape, face, length, crane performance and other specific conditions, determine device hanging point location and number of steel columns. Commonly used methods hoisting steel columns rotation method, delivery method, sliding method, for heavy-duty steel columns can be dual-lift crane.
(Rotation method) steel columns transported to the site, a crane from the side, while lifting and rotation, and the column was rotated around the column foot steel column lift.
(Coasting method) Lift column with 1 to 2 behind the crane, make steel column column foot slip means a method in place to reduce frictional resistance between the column foot and the ground, laying the taxiway.
(Delivery method) Dual or multiple machines lift crane, one of the vice unit. In order to reduce friction with the ground foot steel column resistance, deputy machine hanging point selection in steel column below, cooperation from the host hooks; with the host of lifting, walking or swing deputy confidential, will be delivered to the column foundation foot steel column above and auxiliary machinery uncoupling unloaded, the host will place the column means.
Generally use a little positive hanging steel columns, lug located in capitals, pillar straight and easy on the proofreading; lifting points can be placed in the column length of 1/3, steel column tilted, not easy for the proofreading; for fine long steel columns, steel columns to prevent deformation, can be two or more points.
If the hoisting rope is directly binding on steel column itself, we need to pay attention to the four corners of the steel columns do corners prevent rope was cut; lashing place in order to prevent damage to the steel column partial extrusion, increase to strengthen the board, to increase the trellis column strut.
Before lifting the first floor finishing clean and roots, the operator in the steel column to the top of the foundation After hanging, each stand a good position, hold the pedestal and position it in the foundation board, stop drop down to hook in the column when the foundation board, with a crowbar to pry the column, so where to align the center line of the column foundation, after checking the column foot axis aligned with the root plate, immediately spot welding positioning. If you are already welded connector plate pedestal, after a crane to align bolt connecting plate steel columns, steel columns down to the root bottom surface immediately with nut steel columns.
Dual or multiple machines should try to use the same type of a lifting crane, according to crane capacity, lifting points on the load distribution, each crane load should not exceed 80% of their respective lifting capacity, dual-lift crane, during operation , to cooperate with each other, coordinate action to prevent a crane weightlessness leaving another crane overload, forming accidents. Guangzhou Steel
2, steel columns Proofreading
The main component of steel, such as: columns, beams, roof trusses, roof rack, support, etc., should be immediately proofing device. And permanently fixed, should be proofread before a large apparatus, which is proof, however, and will affect the overall structure of the correct position, it is not allowed.
Column bottom level: According to the actual length of steel columns, column base flatness and capitals to distance from the bottom of the column, the column points to ensure top elevation value, and then decided to adjust the value of the foundation elevation.
Vertical and horizontal crosshairs: the bottom of the steel column production, steel punch in the next column base plate straight face play each other four faces, each face one point, with three points and crosshairs align bedrock surface can compete to reach the dotted line coincidence, if the deviation can be borrowed lines.
Straightness Column: Two columns theodolite looking at 90 ° angle on both sides of the straight, correct use of wind cable rope. After the first nut to constantly adjust the floor below, until it meets the requirements, screw on the floor above the double nut; loosen the cable wind rope, steel columns in a free condition, and then review the theodolite, such as small deviation, adjust and meet the requirements under the nut, The double nut tightening; corrected after the end of the nut and screw welding solid. Guangzhou Steel
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