High Strength Bolt Connection Prefab Steel Building Stable Frame Workshop Factory Storage Warehouse

The high-strength bolt connection prefabricated steel building is a modern, modular industrial construction solution specially designed for factory workshops, storage warehouses, logistics hubs, and light-to-medium industrial production bases. Adopting a fully prefabricated steel frame system and high-strength bolt assembly technology, this product completely abandons traditional on-site welding construction methods, realizing standardized factory pre-processing, unified quality control, and fast on-site assembly. The overall structure adopts a stable rigid frame system with high structural integrity, outstanding rigidity, and excellent deformation resistance, which can adapt to complex terrain and diverse industrial usage environments. Suitable for large-span, large-space industrial buildings, it effectively solves the problems of long construction cycles, unstable on-site welding quality, poor structural stability, and high later maintenance costs of traditional concrete and welded steel buildings. It is the preferred green and efficient building solution for modern industrial construction.

All primary and secondary steel components, including steel columns, H-beam main beams, purlins, support frames, and connecting plates, are precisely cut, drilled, and polished by automated CNC equipment in the factory. The unified bolt hole positioning accuracy ensures zero error docking on-site, and all structural connections adopt high-strength bolts instead of welding, which greatly improves the overall stability, durability, and safety of the building frame. The product supports personalized customization of span, eaves height, load standard, and anti-corrosion grade, meeting the construction needs of different production and storage scenarios.

This series of prefab steel buildings adopts national and international steel structure design standards, with standardized and serialized technical parameters, ensuring structural safety and engineering practicability. The core parameters are as follows:

The main frame adopts Q355B high-strength structural steel, with a yield strength of ≥355MPa and an ultimate tensile strength of 560–720MPa. The secondary structures such as purlins and wall beams adopt Q235B hot-rolled steel, with stable mechanical properties and strong toughness. All steel sections are standard H-beams, C-purlins, and Z-purlins, with uniform wall thickness and no deformation, ensuring the basic bearing capacity of the frame. The steel material has passed strict tensile, compression, and bending tests, with a Poisson’s ratio of 0.3, meeting the structural mechanical design requirements of industrial buildings.

The whole building adopts 10.9-grade high-strength carbon steel bolts for full connection, with optional specifications of M16, M20, M22, and M24. The bolt yield strength reaches ≥930MPa, and the ultimate strength is up to 1150MPa. All bolt connections adopt friction-type anti-slip design, with a joint slip resistance coefficient of ≥0.45. The pre-tightening force of the bolt is precisely controlled by professional torque wrenches, ensuring uniform stress of each connecting node. Compared with ordinary bolts and welding joints, the high-strength bolt connection improves the overall joint bearing capacity by 12%–30%, and the node stability is not affected by construction environment and human factors.

Single-span net span range: 6m–48m, multi-span combined span can reach more than 100m, without intermediate support columns, maximizing the internal usable space. Eaves height customizable range: 4m–20m, meeting the installation requirements of industrial equipment, overhead cranes, and high-stack storage. Standard bay distance: 6m–9m, which can be adjusted according to load requirements. The overall structural dimensional tolerance is controlled within ±2mm, ensuring the overall flatness and stability of the building frame.

Two anti-corrosion treatment processes are optional: hot-dip galvanizing and multi-layer epoxy anti-corrosion painting. The hot-dip galvanizing layer thickness is ≥85μm, with a service life of more than 30 years in conventional industrial environments; the epoxy paint system includes primer, intermediate paint, and topcoat, with a total film thickness of ≥120μm, which can resist coastal salt spray, industrial acid and alkali corrosion, and mechanical wear. The roof and wall panels adopt color steel sandwich panels (rock wool/glass wool insulation), with a thickness of 50mm–100mm, having heat preservation, heat insulation, and fireproof performance.

The product adopts a rigid frame integral structure with high-strength bolt modular connection, forming a unified and stressed overall force system. The "strong column and weak beam" structural design optimizes the force transmission path of the frame, effectively avoiding structural deformation and node damage. The bolted connection nodes have good ductility, which can disperse external impact force and structural stress, and will not produce welding cracks, welding deformation, and residual stress defects common in welded structures. The overall frame has strong integrity, good wind resistance, earthquake resistance, and pressure resistance, and can maintain structural stability under extreme weather and complex working conditions.

Different from traditional building methods that require on-site welding, concrete pouring, and long maintenance cycles, all components of this prefab steel building are completed with cutting, drilling, and anti-corrosion treatment in the factory. On-site construction only requires bolt assembly and overall calibration, which reduces on-site construction procedures by more than 60%. The construction speed is 3–5 times faster than traditional steel buildings, and a standard 1000-square-meter warehouse can be completed in 7–10 working days. It greatly shortens the project investment cycle, enables enterprises to put production and storage into use in advance, and improves economic benefits.

The high-strength bolt connection avoids the oxidation rust and fatigue damage of welding joints. The bolt nodes have standardized specifications, and local replacement and maintenance can be completed quickly without overall structural overhaul. Equipped with high-standard anti-corrosion and weather-resistant treatment, the steel frame is effectively isolated from air, moisture, and industrial corrosive media. The overall service life of the building can reach 30–50 years, far exceeding that of ordinary welded steel buildings and concrete buildings. In addition to this, the steel structure materials are 100% recyclable, meeting green building and environmental protection requirements, with low later operation and maintenance costs.

The large-span frame design eliminates dense intermediate columns, making the internal space open and regular, with a space utilization rate of more than 95%. It can freely adapt to industrial production line layout, large equipment placement, and high-density goods storage. The structural design supports the installation of 3t–50t overhead cranes, ventilation systems, lighting systems, and fire protection systems, and can be flexibly modified and expanded according to later production and storage upgrade needs. It is widely applicable to machinery manufacturing, electronic processing, food factories, logistics warehouses, raw material storage, and other scenarios.

The main frame is professionally calculated and optimized by finite element analysis, with stable static load bearing capacity. The roof uniform live load standard is 0.5–1.2kN/㎡, the floor bearing capacity can reach 3–10kN/㎡ according to customization, which can meet the stacking load of heavy goods and the walking load of production equipment. The bolt connection nodes have uniform static stress, no local stress concentration, and the ultimate static bearing capacity of a single bolt node can reach 282kN, ensuring that the structure does not produce plastic deformation under long-term static load.

Aiming at the dynamic load caused by crane operation and equipment vibration in industrial workshops, the high-strength bolt connection structure has excellent fatigue resistance. The friction-type bolt joint can buffer and disperse dynamic vibration, avoid structural resonance and node loosening, and maintain stable bearing capacity under long-term alternating dynamic load. Experimental verification shows that the structural fatigue life is far higher than the industrial building design standard, which can adapt to long-term frequent crane operation and mechanical vibration working conditions.

The overall frame adopts an optimized wind-resistant structure, which can resist wind loads of 0.5–0.9kN/㎡ (corresponding to 12-level typhoon resistance). The roof and purlin system is densely arranged with high stability, which can effectively bear snow loads of 0.3–1.0kN/㎡, avoiding roof collapse and deformation caused by heavy snow accumulation in winter. The closed bolt connection system ensures that the structural stress is balanced under wind and snow loads, with no loose nodes or structural displacement.

The steel frame has excellent ductility and seismic toughness, and the bolted flexible connection can absorb and consume seismic energy effectively. The overall structure can resist earthquake intensity of 8 degrees, avoiding overall collapse and local damage during earthquakes. Compared with rigid welded structures, the bolt connection structure has better seismic buffer performance, which can maximize the safety of personnel and equipment in the building.

This high-strength bolt connection prefab steel building is widely used in various industrial and commercial scenarios, including large industrial production workshops, heavy-duty equipment factories, logistics storage warehouses, cold storage warehouses, factory comprehensive buildings, and temporary permanent industrial venues. It is especially suitable for projects with high requirements for construction speed, structural stability, load performance, and later expandability, and is an ideal modern industrial building solution for medium and large enterprises.

Qingdao Tisin Steel Structure Construction Technology Co., Ltd. are engaged to provide integrated solution of steel structure workshop, warehouse and multi-storey steel building, including preliminary layout consulting, structural design, fabrication, delivery solution and installation guidance. Our production capacity is 2500 ton per month. The overall space of our factory is around 30,000m2. We own the advanced laser cutting machines, H beam production line, BOX production line, as well as CNC Press Brake and CNC Shearing Machine.