Main Truss Sections: Weight per meter 150-800 kg/m

Component Specifications

Definition

Main truss sections are critical structural components within boom structures of cranes, excavators, and similar heavy machinery. These sections consist of interconnected steel members arranged in triangular patterns to form rigid frameworks that distribute operational loads efficiently. They serve as the primary backbone of the boom, transferring forces from the load point to the machine's base while maintaining structural integrity under dynamic and static loading conditions.

Working Principle

Main truss sections operate on the principle of triangulation, where geometric stability is achieved through interconnected members forming triangles. This configuration minimizes bending moments and converts applied loads into axial forces (tension and compression) within individual members. The truss design optimizes strength-to-weight ratio, allowing the boom to handle significant loads while maintaining manageable weight. Load distribution follows statically determinate or indeterminate structural analysis principles, depending on the truss configuration.

Materials

High-strength low-alloy (HSLA) steel grades such as ASTM A572 Grade 50 or EN 10025 S355, with yield strengths typically ranging from 345-550 MPa. Materials may include weathering steel (ASTM A588) for corrosion resistance or quenched and tempered steels (ASTM A514) for maximum strength. Aluminum alloys (6061-T6, 7075-T6) are used in weight-critical applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	3-12 meters (standard sections)
Fatigue Life	≥100,000 cycles at maximum rated load
Weight Per Meter	150-800 kg/m
Design Safety Factor	2.5-4.0 (per ISO 8686)
Maximum Load Capacity	50-500 tons (depending on configuration)
Cross Section Dimensions	0.8-2.5 meters width, 0.6-1.8 meters depth

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 8686, ISO 20332, DIN 15018, DIN 4114, EN 13001

Parent Products

This component is used in the following industrial products

Boom Structure

The main structural framework of a ship unloader's boom that provides support and reach for material handling operations.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking at stress concentration points
Corrosion in harsh environments
Overloading beyond design limits
Improper assembly or connection failures
Material defects or manufacturing flaws

FMEA Triads

Trigger: Cyclic loading exceeding fatigue limits
Failure: Crack initiation and propagation in welded joints or high-stress areas
Mitigation: Implement regular non-destructive testing, design with adequate fatigue safety factors, use improved welding techniques and post-weld treatments

Trigger: Exposure to corrosive environments without adequate protection
Failure: Section thickness reduction and loss of structural integrity
Mitigation: Apply protective coatings (epoxy, zinc), use corrosion-resistant materials, implement regular inspection and maintenance programs

Trigger: Improper assembly or connection torque
Failure: Joint slippage or bolt failure leading to structural collapse
Mitigation: Follow manufacturer torque specifications, use calibrated torque tools, implement assembly verification procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2 mm for member lengths, ±1.5° for angular alignment, ±0.5 mm for hole positioning

Test Method

Static load testing to 125% of rated capacity, non-destructive testing (ultrasonic, magnetic particle), dimensional verification per engineering drawings

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Main Truss Sections

Manufacturer profiles associated with Main Truss Sections.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of main truss sections in boom structures?

Main truss sections serve as the primary load-bearing framework that transfers operational forces from the load point to the machine base while maintaining structural stability and rigidity.

How are main truss sections typically connected in boom assemblies?

Sections are connected using high-strength bolted joints (ASTM A325/A490 bolts) or welded connections, with pinned joints at articulation points to allow for boom extension and articulation.

What maintenance is required for main truss sections?

Regular inspection for cracks, corrosion, deformation, and bolt tightness; non-destructive testing (magnetic particle, ultrasonic) at recommended intervals; and protective coating maintenance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Main Truss Sections