INDUSTRY COMPONENT

Lacings

Lacings are structural cross-bracing components in lattice booms that provide diagonal reinforcement to resist buckling and torsional loads.

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Component Specifications

Definition
Lacings are diagonal or cross-shaped structural members in lattice boom construction that connect main chords to form triangular truss patterns. They transfer shear forces between chords, increase moment of inertia, and prevent local/global buckling under compressive and bending loads. Critical for maintaining geometric stability and load distribution in telescoping or fixed lattice sections.
Working Principle
Lacings work by creating triangulated truss structures that convert applied loads (compression, tension, bending) into axial forces along their length. They distribute stresses evenly across the boom cross-section, reduce unsupported chord length (slenderness ratio), and enhance torsional rigidity through geometric bracing patterns (single lacing, double lacing, or K-bracing).
Materials
High-strength low-alloy steel (HSLA) ASTM A572 Grade 50 or equivalent; yield strength ≥345 MPa, tensile strength ≥450 MPa. Corrosion-resistant coatings: hot-dip galvanizing (ISO 1461) or epoxy paint (ISO 12944).
Technical Parameters
  • Pattern Single diagonal, double diagonal, or K-type
  • Connection Bolted (grade 8.8 bolts) or welded (fillet welds per AWS D1.1)
  • Cross-section Round bar, flat bar, or angle iron
  • Spacing Ratio L/r ≤ 200 per ASME B30.5
  • Diameter/Thickness 10-50 mm typical
Standards
ISO 4301-1, DIN 15018, FEM 1.001

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Lacings.

lattice boom lacing crane structural bracing diagonal bracing components boom reinforcement truss bracing buckling resistance lifting equipment parts Lacings Lacings in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Lattice Boom

A structural component of a lattice boom crane consisting of interconnected steel members forming a truss structure for load lifting and positioning.

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Engineering Analysis

Risks & Mitigation
  • Fatigue cracking at connection points
  • Corrosion-induced section loss
  • Buckling due to improper slenderness ratio
  • Overload causing permanent deformation
FMEA Triads
Trigger: Cyclic loading and stress concentration at bolted/welded joints
Failure: Fatigue crack propagation leading to lacing fracture
Mitigation: Regular NDT inspections (ultrasonic testing), use of fatigue-resistant details (rounded edges), and proper preload in bolted connections
Trigger: Exposure to corrosive environments (marine, industrial)
Failure: Section loss reducing load-bearing capacity
Mitigation: Apply protective coatings (galvanizing, epoxy), implement corrosion monitoring, and schedule preventive maintenance
Trigger: Design error (excessive slenderness ratio L/r)
Failure: Elastic buckling under compressive loads
Mitigation: Follow ASME B30.5 spacing rules, use double lacings for long spans, and validate with FEA analysis

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Length tolerance ±2 mm per 1000 mm; straightness tolerance ≤1/1000 of length
Test Method
Load testing per ISO 4301 (1.25x rated load), ultrasonic testing for weld integrity, hardness testing per ISO 6506

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of lacings in a lattice boom?

Lacings provide diagonal reinforcement to form stable triangular truss patterns, transferring shear forces between main chords and preventing buckling under compressive and bending loads.

How are lacings typically connected in lattice booms?

They are connected via bolted joints (using high-strength bolts) or welded fillet joints, following standards like AWS D1.1 for welding or ISO 898-1 for bolting.

What materials are used for manufacturing lacings?

High-strength low-alloy steel (e.g., ASTM A572 Grade 50) with corrosion protection like hot-dip galvanizing or epoxy coatings, ensuring durability under outdoor and heavy-load conditions.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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