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1. Technical preparation
(1) Fully familiar with the bar material blanking list, engineering specification requirements, and mechanical operating procedures. Proficiency in mechanical operation methods.
(2) Operating conditions
(3) For the storage site of raw steel reinforcement, the ground should be hardened and kept dry, and drainage ditch should be set around the site.
(4) The incoming steel bars are inspected by the technicians, and the three certificates are complete. According to the construction plan, they should be placed neatly according to the variety and specifications. They should be padded with bricks or wooden blocks, and should be more than 200mm above the ground. Depending on the weather conditions, add them if necessary. Cover with rain cloth.
(5) Set up a steel bar processing shed according to the location of the plan. The roof adopts corrugated asbestos tiles. The lighting used for night construction is hung on the roof and a lampshade is added. The wires are well insulated.
(6) Check the types and specifications of the on-site rebar stocks to check with the bill of materials. If it is found that the on-site rebar shortage cannot be resolved in the near future, negotiate with the technicians for replacement.
2. Process flow
(1) Operating points and technical requirements
(2) The surface of the steel bars used on site should be clean, free from damage, oil stains, and rust. Check before processing. If oily steel bars are found, they should be cleaned with washing powder. There are old rusted wire rod steel bars on the surface of the steel bars. Use a straightening machine. Derusting, thicker steel bars are derusted with a derusting machine. Old rusty steel bars shall not be used.
(3) The wire rod shall be straightened with a hoist, and the straight bar shall be corrected by a manual spanner. There shall be no obvious scratches when straightening the bar.
(4) Count the steel bars on the blanking list, use a cutting machine to cut the material, cut the long material first, and then cut the material, try to reduce the short end, hold the cut steel bar tightly when the material is broken, and when the punching blade retreats Feed the steel bars into the knife edge, keep the distance between the blades above 150 mm, and use pliers to clamp the feed when cutting the steel bars.
(5) When manually forming, the stirrups are formed by a hand wrench. Before bending the steel bars, draw a segment line according to the style and size required by the bill of materials. When bending, use slow force, and be steady at the end. Master the bending position so as not to bend too much or not to the required angle.
(6) Use mechanical molding for steel bars with a diameter above 12mm. Before molding, be familiar with the use of the reverse switch and the rotation direction of the working plate. When bending, you should change it at any time according to the thickness of the steel bar and the required arc bending diameter. Shaft sleeve.
(7) Requirements for hooks and bending of steel bars
(8) 180o bending hooks are to be made at the end of grade I steel bars, and the arc bending diameter D is 2.5 times the diameter d of the bent steel bars (φ6.5=15mm, φ8=20mm, φ10=25mm, φ12=30 ㎜), the length of the straight part is 3 times the diameter of the steel bar (φ6.5=18㎜, φ8=24㎜, φ10=30㎜, φ12=36㎜)
(9) For the 90-degree folding of the secondary steel bar end, the bending diameter D is 4 times the steel bar diameter d (Ф12=48mm, Ф14=56mm, Ф18=72mm, Ф20=80mm, Ф22=88 ㎜、Ф25=100㎜), see Figure 2.
(10) The bending diameter D of the bending part of the middle part of the bending steel bar is 5 times the steel bar diameter d (Ф22=110mm).
(11) The end of the steel bar is made with a 135-degree hook and the length is 10d (φ8=80mm, φ10=100mm).
2.2.7 Production of cushion
(12) Use 1:2 cement mortar to pre-make 500*50MM cushions, the thickness of which is the thickness of the protective layer, and the base floor cushions are made of small peas.
(13) The mat is prefabricated on site. The woodworker uses 2m long, 20mm wide wood strips to make a 50*50MM grid, and brushes the spacer. When making the mat, first lay the bamboo underground Plywood, then put on the mold, pour the mixed mortar into the box and level it, and embed 20-22 fired wire according to the used part.
(14) After the mat is made, the sacks are laid at 12H and watered and moistened. After 7 days of maintenance, a special person will be assigned to take care of it. The mat can be used after the final setting is reached.
(15) The specifications, dimensions, and squareness of the cushion blocks are required to meet the construction requirements, otherwise they are not allowed to be used.
3 Quality requirements
(1) Requirements for main control items
(2) The surface of the steel bar should be clean, free from damage, oil stains and old rust with grain or flakes.
(3) Rebar processing should be straight and without local twists.
(4) The specification, shape, size and quantity of processed steel bars must meet the design requirements and construction specifications
