Pre-Engineered Steel Workshop With Crane Beam For Heavy Industry Production Workshop

The main load-bearing components including main portal frame beams, steel columns, crane beams, column base plates, and heavy-duty corbels adoptQ355B high-strength structural steel, with partial super-large cross-section components adopting welded H-shaped steel processed by integral welding. Compared with ordinary Q235 steel, Q355B steel has higher yield strength, better low-temperature toughness, stronger compression and bending resistance, and excellent fatigue resistance, which can effectively resist dynamic impact loads generated by crane frequent operation, avoid structural deformation and local buckling, and ensure the overall stability of the workshop under long-term heavy load.

For super-span and super-heavy load workshop projects, high-standard hot-rolled H-beams and box-section steel columns are preferentially used. The steel strictly controls the content of five core elements: carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). Low phosphorus and low sulfur content effectively avoid cold brittleness and hot brittleness of steel, ensuring excellent welding performance and structural safety of key components such as crane beams and column supports.

Secondary auxiliary components such as roof purlins, wall girts, column and roof bracing systems, tie rods, struts, and connecting brackets adopt high-quality Q235B carbon structural steel. These components undertake the functions of structural reinforcement, overall stabilization, enclosure fixation, and load transfer. With moderate strength, good plasticity and excellent processing performance, they can well cooperate with the main steel frame to disperse wind load, seismic load and local auxiliary load, and improve the overall rigidity and integrity of the workshop structure.

The workshop is equipped with high-strength high-tensile bolts, welding rods matching steel grades, and professional anti-corrosion coating materials. All bolts and fasteners undergo anti-rust and anti-oxidation treatment; the welding materials are strictly matched with the base metal to ensure welding seam strength and toughness consistent with the steel body. The multi-layer anti-corrosion paint system is environmentally friendly and weather-resistant, which can effectively resist industrial atmospheric corrosion, dust erosion and temperature difference changes in heavy industry production environments.

After the steel plates, hot-rolled profiles and auxiliary materials enter the factory, professional inspectors check the material certificates, chemical composition reports and mechanical property test reports one by one. Conduct sampling inspection on the thickness, flatness, surface quality and material grade of steel products to eliminate unqualified raw materials. Classify and store qualified Q355B high-strength steel and Q235B carbon steel separately to avoid material mixing, and lay a foundation for subsequent precision processing.

Adopt CNC automatic cutting machines and plasma cutting equipment for precise blanking of steel plates and profiles. According to construction drawings and processing files, complete the cutting of H-beam web, flange plate, crane beam plate and various connecting plates. The cutting size error is strictly controlled within ±1mm to ensure the matching accuracy of subsequent assembly. Remove cutting slag, burrs and sharp edges after cutting to avoid affecting welding and assembly quality.

Carry out manual and mechanical integrated assembly of cut steel parts. For key components such as welded H-beams and crane beams, use professional assembly equipment for precise grouping, ensure the verticality of webs, the flatness of flanges and the overall symmetry of components. Fix the assembled components with positioning welding to prevent displacement and deformation during formal welding, ensuring the overall geometric accuracy of load-bearing components.

Adopt submerged arc automatic welding process for formal welding of main components, with stable welding current and uniform welding speed, forming full and dense welding seams. For key stressed parts such as crane beam welding seams, column stiffener plates and corbel connecting welds, adopt multi-layer multi-pass welding technology to improve welding seam strength and fatigue resistance. After welding, remove welding slag and spatter, and inspect the appearance of welding seams to eliminate defects such as air holes, incomplete penetration and welding cracks.

After welding, all components are subject to professional thermal correction and mechanical correction treatment. Effectively eliminate welding deformation and internal stress generated during processing, ensure the flatness, straightness and verticality of steel beams and steel columns meet industrial standards, avoid structural bending and torsion deformation after on-site installation, and guarantee the stable stress of the crane beam system under dynamic load.

Adopt CNC drilling equipment for precise hole opening of component connecting parts, bolt holes and mounting holes. The hole position accuracy and aperture size are strictly controlled to ensure the seamless matching of on-site assembly and bolt installation. Complete the end milling and groove processing of key components to improve the tightness and stability of structural connection nodes.

All steel components undergo shot blasting rust removal treatment to reach Sa2.5 high-standard cleanliness, completely removing surface oxide scale, rust and oil stains. After pretreatment, apply multi-layer anti-corrosion coating including anti-rust primer, intermediate coating and weather-resistant topcoat. The coating thickness is uniform and adheres firmly, which can effectively resist industrial corrosion and extend the service life of steel structures. All painted components are placed in a dust-free workshop for natural curing to ensure coating forming quality.

After the completion of component processing and painting, conduct full-size dimensional inspection, appearance quality inspection and performance sampling test. Qualified products are numbered, classified and packaged with professional protective materials to prevent collision deformation and coating damage during transportation. Arrange special vehicles for closed transportation to ensure complete and intact delivery of on-site installation components.

Verify the factory qualification certificate, chemical composition analysis report and mechanical property test report of all steel materials, welding materials and coatings. Conduct random sampling re-inspection of steel tensile strength, yield strength, elongation and five-element composition. Reject all unqualified materials to ensure that the base material performance of main and secondary steel structures fully matches the design load standard of heavy workshops.

Arrange special quality inspectors to track and inspect each processing link in real time, including cutting size accuracy, assembly gap, welding process parameters, welding seam appearance and correction effect. Focus on inspecting the processing quality of key load-bearing components such as crane beams and steel columns, and correct unqualified processes in time to avoid batch quality problems.

For key welding seams of crane beams, main beams and corbel nodes, professional nondestructive testing is carried out, including ultrasonic testing (UT) and radiographic testing (RT). Detect internal hidden defects such as welding cracks, incomplete penetration and inclusions, ensure 100% qualified rate of key welding seams, and avoid structural safety hazards caused by welding defects under long-term dynamic load.

Conduct full-size re-measurement of finished steel components to check the overall size, flatness, verticality and hole position accuracy. Conduct sampling test on the coating thickness, adhesion and weather resistance of the painted surface. For special heavy-load components, conduct static load test and fatigue resistance simulation test to verify the bearing capacity and structural stability of the components, ensuring that they adapt to frequent crane operation working conditions.

Before delivery, conduct final overall inspection of all finished products, sort out all inspection reports, material certificates and test data, and form complete product quality files for archiving and delivery. Ensure that each batch of products has traceable quality records, providing reliable quality guarantee for on-site installation and long-term safe operation of the heavy industrial steel workshop.