3.1 Steel member manufacturing process.
3.2. Steel component scheduling and material preparation.
3.2.1. Procurement of special steels.
1. Ordinary Q355B steel plate, double fixed length (length and width) procurement cycle is about 45 days;
2. The procurement cycle of high-strength steel with Q420 and above, plate thickness greater than 40mm, Z-direction performance, and flaw detection grade requirements is about 60 days.
3.2.2. Confirm the requirements for steel material backup materials.
According to the specifications of the steel column and the steel beam, it is split into plates, and then the width and length are fixed according to the length and width group of the plates, if the length cannot be fixed, the length can be unified, and finally spliced in the length direction of the steel member.
3.2.3. Capacity and scheduling.
According to the size of the project's welding filling, the proportion of welders and riveters in the factory, the normal scheduling of production and material preparation is usually considered 45-60 days of procurement cycle, and the general processing and manufacturing cycle of ordinary components is about 35-40 days.
3.3 Steel entry and exit requirements.
1. Steel entering the factory: it is necessary to hold the quality assurance certificate, procurement budget list and delivery list of the steel mill;
2. Steel factory: It is necessary to hold the factory certificate, the steel witness sampling retest report, the welding consumables inspection report, the flaw detection report or quick report issued by the flaw detection unit, and each inspection batch should also pay the corresponding inspection batch delivery information and delivery list.
3.4 Steel component transportation requirements.
1. Conventional steel components: the length is generally not more than 175 meters, width not more than 3 meters, height not more than 28 meters.
2. Oversized steel components: transportation routes in East China, the height does not exceed 35 meters (related to the bridge hole), the width does not exceed 46 meters, the length is determined according to the transport route; If the ultra-low board car is used, the height does not exceed 45-5 meters, but the width cannot be extra-wide, otherwise the toll booth will not be passable.
3. Transportation of special oversized steel components: plan the whole process of transportation routes in advance and conduct on-site surveys, and review the passability and load of vehicles such as overpasses, toll stations, rest areas, bridge culverts, pipe corridors above roads and bridges, high-voltage transmission and distribution networks, signal lights and traffic signs, etc. Road transportation is severely restricted, and appropriate consideration can be given to water transportation as the mainstay, supplemented by roads, on-site investigation of wharves along the line, river bridges, wharf loading and unloading machinery and equipment capacity, etc.
4.1 Principles of construction deployment.
1. Introduction to the project.
Structural system, the minimum and highest point height of the steel structure installation, the main components and composition, the minimum and maximum lifting weight of a single component, the typical cross-sectional size and material of the component, and the maximum amount of steel.
2. Technical preparation.
Detailed design and determination of steel structure construction, welding process qualification test, flame cutting process qualification test, coating process qualification test and other preparatory work.
3. Plane layout.
It mainly carries out on-site water, electricity, dissipation, material storage yard, traffic road planning, and hoisting stations of main machinery and equipment.
4. Selection and organization of construction plans.
1) Comparative analysis and selection of steel structure installation methods and processes; Selection and analysis of hoisting equipment (commonly used truck cranes, crawler cranes, tower cranes); Analysis and determination of steel structure installation sequence, partition and installation process;
2) Preparation and entry organization of labor, schedule, resource and material allocation plan, and large machinery and equipment allocation plan.
4.2. Ergonomic analysis of welders.
1. A skilled welder can complete the welding volume of 20kg of electrode in 8 hours, and the weld category is a first-class full penetration weld;
2. Weld category: first-class full penetration weld; 30mm thickness steel plate, 1 person 9 hours welding 24 meters of extension; 40mm thickness steel plate, 1 person 9 hours welding 18 meters extended; 50mm thickness steel plate, 1 person, 1 person, 9 hours welding4 meters of extension; 60mm thickness steel plate, 1 person 9 hours welding 1 extension meter; 70mm thickness steel plate, 1 person 9 hours welding 08 meters extended;
4.3. Riveting ergonomics analysis.
The components of large bolt group nodes are more difficult to install in situ at high altitude, and are generally assembled on the ground, and are hoisted into a whole truss by slicing, segmenting or assembly.
4.4. Analysis of the installation time of super high-rise outrigger truss and ring truss.
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