I don't know which company it is. You can consult Zhejiang Zhongtun Bridge, a leading enterprise of corrugated steel webs in China. Compared with the traditional flat web H-beam, the corrugated web H-beam not only meets the function, but also reduces the weight and improves the efficiency. It has been applied in the steel structure of civil buildings in China and has broad application prospects. Corrugated web is made by pin-less molding technology, with adjustable waveform, 3.5 meters in section height and 65438 04 mm in thickness. Compared with common forming and stamping methods, corrugated web has the advantages of fast processing speed, no residual stress after forming, easy control of forming rebound value and high forming accuracy. Key words: unconstrained forming of H-beam with corrugated web. China Library Classification. : TU39 1 Document ID: A ItemNo.:1672-3791(2013) 04 (b)-0079-01Project Overview The maximum span of the steel structure of Yantai Chaoshui Airport Terminal is 55. All steel beams are H-beams with corrugated webs. The maximum cross-section of steel beam is 3.5 m, the thickness of corrugated web reaches 14 mm, and the roof steel structure is about 7500 t. 2 Construction difficulties. The forming and manufacturing method of ordinary corrugated web H-beam can only process members with cross-section height less than 1 m and web thickness less than 5 mm, and there are few web waves, so it cannot be applied to the manufacturing of corrugated web H-beam in this project. 3 Key technologies and operation points 3. 1 Construction process: steel plate warehousing → steel plate cutting and blanking → steel plate fine cutting groove → corrugated web die forming → corrugated web splicing welding → corrugated web H-beam assembly → corrugated web H-beam welding → forming on standard steel platform → intermediate inspection of welding forming → fine drilling → factory pre-assembly → shot blasting and rust removal → painting compulsory paint → component packaging and delivery. 3.2 Key Technologies and Operating Points 3.2. 1 Preparation for Construction Be familiar with the design drawings before construction, work out work instructions for each process, make disclosure to all operators, and make clear the design intent and requirements. The three-dimensional model of the structure is established by Tekla software, and the construction drawing is refined. Before manufacturing, welding process evaluation should be carried out to determine welding process parameters. 3.2.2 NC plasma cutting of steel plate (1). (1) Before cutting, the oil stain, rust and moisture on the surface of the parent material should be removed, and the surface after cutting should be smooth and crack-free, and kerf compensation should be considered during cutting. (2) In order to ensure the blanking accuracy and eliminate the cutting deformation and stress, the steel plate with a thickness of less than or equal to 20 mm is cut by numerical control plasma underwater. (3) The steel plate with thickness greater than 20 mm is cut by numerical control flame. 3.2.3 Fine cutting and beveling of steel plate (1) flange plate, web plate, reinforcing plate and connecting plate. According to the requirements of welding process and field installation, numerical control plasma groove is adopted. (2) After cutting and blanking, removing the cutting hardening layer is beneficial to ensure the Z-direction performance of the thick plate and prevent the thick plate from delamination and tearing. 3.2.4 Pinless compression molding of corrugated web (1) Pinless compression molding device presses corrugated steel web. (2) Corrugated webs are formed by nail-free method, and there are no more than two compression nailing areas on the same section at the same time, and the steel plates on both sides are not nailed, so they can freely expand and contract during forming. (3) Before pressing, the steel plate must be accurately positioned and fixed to ensure that the pressed corrugated steel plate meets the design requirements. (4) During the pressing process, pay attention to the pressing direction and positioning of the steel plate to ensure that the groove direction is consistent with the process requirements. (5) In the pressing process, the machining allowance and welding deformation of the subsequent process must be considered, and the springback of bending deformation must be considered. According to the design requirements, the bending radius should be greater than 15 times the web thickness. (6) The corrugated steel web formed by pressing shall be free from defects such as cold bending crack, trend fracture, wave edge, corner crack, corner folding, longitudinal bending and twisting. 3.2.5 Splicing and welding of corrugated webs After the corrugated webs are formed, they are spliced and welded along the vertical direction of the webs. Submerged arc welding is used for welding, and the weld quality meets the quality requirements of full penetration first-class weld. 3.2.6 The assembly welding of H-beam with corrugated web (1) shall be carried out on a special jig, and the longitudinal jig and the transverse jig shall be set first. The rigidity of the jig frame is greater than that of the beam, and the levelness of the jig frame should be controlled within 2 mm, and it can only be used after inspection. (2) Install the jig frame. ① Assembly jig: spread the steel plate on a relatively flat cement floor, and a vertical straight line pops up on one side. A 12# channel steel is vertically placed every 2.5 m in a straight line, and diagonal braces are added outside the plane. Place a 50 cm section H-beam at a distance of 0/5 cm from the vertical channel steel/KLOC-,and the other H-beam shall be determined according to the beam size. For the vertical channel steel on the other side, the jack size of the top flange plate should be considered. (2) Welding jig frame: jig frames with 45 angles on both sides are erected with 14# channel steel, and the assembled H-shaped corrugated web beam is put into the jig frame for welding. 4 Assembly method and steps (1) Draw the floor template on the steel platform according to the assembly drawing. (2) Hoist the upper flange plate into the pre-assembled fixture, and spot weld it firmly with vertical channel steel to prevent rollover and injury. Spot welding adopts 50×50× 10 steel plate and channel steel. (3) Hanging the spliced corrugated web into the jig frame for positioning and positioning with the upper flange plate. (4) Lift the lower flange plate on the other side and position it with the web plate. The outer side of the lower flange plate is matched with the web plate. Can jack up 3 ~ 4 jacks at the same time, press the web with counterweight and jack up. When all spot welding is completed, the corrugated web steel beam is hoisted into the welding jig for welding. 5. Welding (1) All welding operations are factory welding, and the whole corrugated web beam of each construction segment is manufactured in the factory, and the factory welding is fully automatic or semi-automatic equipment welding. (2) Welding of H-beam with corrugated webs, including welding of connectors and welding between segments. All welds shall be