reinforcing bar engineering

reinforcing bar engineering Reinforcing bar engineering Reinforcement engineering major construction method The construction process Steel raw material inspection Steel into the scene, the scene material member reinforced factory inspection certificate, and batch furnace, at the scene of the operator immediately sampling do reinforced second interview work, reinforced second interview via approval rear can use. Unqualified reinforced firmly clear exit, record and prepare the related material management. Reinforced materials approach and acceptance of the control flow chart Steel processing Reinforced piled up, the scene processing forming at the scene. Reinforced ingredients work by full-time reinforcement personnel in strict accordance with the specifications and design requirements, and according to the engineering construction progress and the loading ability of steel processing and supply plan. Steel processing flow operation system diagram Reinforced ingredients: ingredients according to drawings and specifications, especially of beam-column joints and reinforced the secret place, must first lofting. Order material must review and correct signature rear can carry on the processing. Steel bar with different length blanking principle: the same specification, the length is tie-in, ingredients as a whole; To continue long expected, by cutting short expected to reduce short head, reducing wear and tear. Steel cutting: the reinforcing steel cutter and grinding wheel cutting machine to cut steel. When cut off to ensure the blade and the impact of the blade edge distance, diameter < 20 mm of steel should be overlapping 1-2 mm, diameter of 20 mm or reinforcement should be about 3 mm, to ensure the blanking length of reinforcement. Stirrup molding: will cut steel according to the reinforcement of single partition, segmented, layered, parts, specifications for bending forming. Steel processing control key for processing, the ladder stirrup reinforcement, spacer frame, horse stool processing and processing quality of straight thread connection. Steel molding requirements Type to install the end structure processing method arc bending radius straight length Lower reinforced HPB235 plate 180 ? hook manual operation wave board reinforced diameter 1.5 times, and should not be less than the diameter of 10 d HPB235 plate bearing negative bending steel 90 ? hooked bar diameter is 1.5 times, and should not be less than the diameter comply with the design requirements HPB235 beam and column stirrup 135 ? hook is 2.5 times the diameter of the steel and should not be less than the radius of the main reinforcement 10 d HRB335 beam and column stirrup 135 ? bend hook molding machine molding is 2.5 times the diameter of the steel and should not be less than the radius of the main reinforcement 10 d HRB335 plate bearing negative bending steel 90 ? hooked bar diameter is 1.5 times, and should not be less than the diameter comply with the design requirements HRB400 beam and column stirrup 135 ? hook is 2.5 times the diameter of the steel and should not be less than the radius of the main reinforcement 10 d HRB400 plate bearing negative bending steel 90 ? hooked bar diameter is 1.5 times, and should not be less than the diameter comply with the design requirements Steel processing and allowable deviation Serial number project allow deviation (mm) 1 mechanical reinforcement length along the length direction of the net size + 10 2 turn up steel bending position plus or minus 20 3 in the stirrup net size + / - 5 Steel pile and identification requirements Raw material and finished product stack Steel raw material into the scene, according to the location of phased construction plan of the ground structure specification and model to pile up, can't at the place for unloading is convenient. Steel processing and shaping the area, division, layered, segmentation and component name, stacked in number order, the same parts reinforced or same member to pile up together, guarantee the construction is convenient. Reinforced logo The project of large amount of reinforcement and variety, the reinforcement approach after ordered stacking according to level, model separately, and to brush paint marking of steel at all levels, it is forbidden to mix. Steel bar electroslag pressure welding Construction preparation Reinforced preparation Level of reinforcement, diameter must meet the design requirements, have the factory certificate and retest report. Steel comes into play, should according to the current national standard "reinforced concrete with hot rolled ribbed steel bar" GBl499 rules draw specimens for mechanical property test, such as its quality must comply with the provisions of the relevant standards. To have the requirements for seismic resistance of the frame structure, its longitudinal stress the strength of the reinforcement should satisfy the design requirements; When the design has no specific requirements, for one, the secondary seismic grade, the strength of the inspection from the measured values shall meet the following requirements of the concrete structure engineering construction quality acceptance procedures "(GB50204-2002 article 5.2.1) : Reinforced the tensile strength and yield strength measured values of the ratio of the measured values should not be less than 1.25; Steel yield strength of the measured values and the ratio of strength standard values should not be greater than 1.3 concrete structure engineering construction quality acceptance procedures "article 5.2.2 (GB50204-2002). Electroslag pressure welding construction preparation The machines and prepare Manual electroslag pressure welding equipment including: welding power source, control box, the welding jig, flux tank, etc. Automatic electroslag pressure welding equipment (preferred) including: welding power source, control box, box operation, welding head, etc. Welding power source. Steel bar electroslag pressure welding appropriate USES secondary high no-load voltage (TSV) of ac or dc welding power source. (32 mm diameter and the steel welding, the welding power supply capacity of 600 a can be used; more than 32 mm diameter and steel welding welding power supply capacity should be adopted for 1000 a). When welding machine capacity is small, also can use a smaller capacity of the same model, with the performance of the two parallel machine. Electroslag pressure welding machine Flux preparation The performance of the flux should be comply with the provisions of the 5293 carbon steel submerged arc welding with flux. Micro HJ401 flux model, commonly used for smelting high manganese silicon manganese in low fluoride flux or high silicon low fluoride flux. Flux should be stored in dry warehouse, prevent to be affected with damp be affected with damp. If be affected with damp be affected with damp, before use must be approved by 250 ~ 300 ? for 2 h. Used in the recycling of flux, should remove the slag and sundry, and should be evenly mixed with the new flux used. Flux should be the factory certificate. Operation conditions Welders must have a valid welder examination certificate. Equipment should comply with the requirements. Welding jig should have enough stiffness, mobile flexible under the maximum allowable load, easy to operate. The diameter of the solder pot and rebar diameter welding, do not send in the welding process less bad. Voltmeter, time display should be equipped so that the operator grasp accurately the welding parameters. Power supply should comply with the requirements. When the power supply voltage drop is greater than 5%, it is unfavorable to welding. Workplaces shall have security protection measures, formulate and implement safety series measures, strengthen labor protection welders, prevent burns, electric shock, fire, explosion and burning machine. Pay attention to the joint position, pay attention to the same extent in joint reinforced area percentage, no