Heavy-duty bolted trusses aren’t ordinary trusses "with random bolts screwed on"—they’re heavy-duty trusses assembled using high-strength bolts (Grade 10.9/8.8) + precision connection plates. Instead of welding, they rely entirely on bolts to "lock" Truss sections in place. This design not only supports ton-level loads but also allows disassembly and reassembly (e.g., relocating during workshop equipment upgrades). For scenarios that demand both "stability and flexibility"—such as factory heavy equipment frames, logistics warehouse load-bearing platforms, and large outdoor maintenance frames—they are the perfect choice. I. First, Understand: Why Is It "Stable"? The Core Lies in "Bolts + Connection Structure"
Compared to welded trusses, the stability of heavy-duty bolted trusses doesn’t come from "rigidity of welded joints," but from "bolt preload + connection plate fit." The key lies in two points:
1. Strong Bolts, Tight Locking
They use Grade 10.9 high-strength bolts (3 times stronger than ordinary Grade 4.8 bolts). During installation, a torque wrench must be used to tighten them to the "rated torque" (typically 150–200 N·m). The bolts generate "preload," which presses the connection plates of two truss sections tightly together. Even when suspending 5 tons of equipment, the joint gap won’t loosen.
2. Precision Connection Plates, No Wobble Under Load
The connection plates at both ends of the truss are "CNC-machined," with a flatness error ≤ 0.2mm and precise bolt hole alignment (deviation ≤ 1mm). Reinforced Bolt On Truss Design During assembly, the two connection plates fit perfectly—unlike ordinary trusses where "misaligned plates concentrate force on a single bolt." Even under vibration (e.g., from a workshop stamping machine), force is evenly distributed across all bolts.
II. 2 Common Types of Heavy-Duty Bolted Trusses—Choose Based on "Scenario Needs"
They are mainly divided into "steel square-tube models" and "steel triangular models," with distinct uses. Avoid random selection:
1. Steel Square-Tube Heavy-Duty Bolted Trusses (Focus on "Powerful Vertical Load-Bearing")
Structural Features: Square-tube cross-section (300×300mm–600×600mm) with a wall thickness of 5–12mm. "Thickened connection plates" (15–20mm thick, with 8–12 bolt holes each) are welded to both ends. Grade 10.9 high-strength bolts (M16–M24 specifications) are used.
Core Advantages:
Top-Tier Vertical Load-Bearing: A 300×300mm model can withstand 6 tons with an 8-meter span (e.g., supporting 3 layers of heavy racks, 2 tons per layer); a 600×600mm model can withstand 15 tons with a 12-meter span (for hanging large crane accessories).
Flexible Assembly/Disassembly: Simply unscrew the bolts to disassemble into sections, which can be relocated and reinstalled during workshop upgrades—unlike welded trusses that are "permanently fixed and immovable."
Applicable Scenarios:
Logistics Warehouses: Load-bearing frames for heavy storage racks (3–5 meters tall, used for storing metal materials and heavy parts).
Factory Workshops: Operating platform frames for production lines (2 meters tall, capable of holding 6 workers + 3 tons of equipment), suspension frames for heavy tools (for hanging 5-ton hydraulic equipment).
Note: Square Truss After tightening the bolts, "mark them" (draw a line across the bolt and connection plate with paint). Durable Bolt On Truss Structure If the lines are out of alignment during subsequent inspections, it indicates that the bolts have become loose and need to be tightened again. 2. Steel Triangular Heavy-Duty Bolted Trusses (Focus on "Strong Torsion Resistance + Large Spans")
Core Advantages:
Strong Torsion Resistance: A truss with a 10-meter span can hold a 4-ton fan and remain untwisted even in a level-5 side wind—30% more torsion-resistant than a square-tube truss of the same specification.
Flexible Spans: Can achieve a maximum span of 20 meters (with one support column added in the middle), Square Truss Rigging Hardware suitable for large workshop spaces (e.g., a 15-meter-wide workshop, Heavy Duty Bolt On Truss System for building equipment frames spanning the entire workshop). Applicable Scenarios:
Factory Workshops: Square Truss for Event Stages Suspension frames for heavy machinery (5-ton robotic arm rails), overhead equipment frames in workshops (for hanging conveyors and heavy lighting). Outdoor Industrial Areas: Maintenance platform frames for large equipment (8–12 meters tall), outdoor heavy-duty billboard frames (15–20 meter spans).
Key Requirement: For outdoor use, "Heavy Duty Bolt-On Truss hot-dip galvanization + spray coating" (coating thickness ≥ 120μm) is mandatory to prevent bolts from rusting and seizing. Inspect bolts annually and replace any that are rusted promptly.
Wuxi Zhongshengwei Metal Products Co., Ltd.
Contact Now