---
title: "Jib (Boom)"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:JIB_BOOM"
  data_integrity_hash: "5f112314096e0e781fcadcbdaa8bf911"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:JIB_BOOM"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/jib-boom.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/jib-boom"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "15-80 m"
    unit: "m"
engineering_limits:
  max_safe_operating_point:
    value: 4500
    unit: "kNВ"
    consequence: "Euler-Bernoulli beam theory elastic buckling at critical stress Пѓ_cr = ПЂВІEI/(KL)ВІ where Пѓ_cr в‰¤ 250 MPa yield strength of S355 structural steel"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Fatigue crack propagation from cyclic loading exceeding О”K_th = 5 MPaв€љm threshold"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Ultrasonic phased array inspection every 5000 operating hours with crack growth rate monitoring using Paris' law da/dN = C(О”K)^m"
  - node_2:
      trigger: "Lateral-torsional buckling instability at slenderness ratio О» &gt; 120"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Stiffener plates at 2.5 m intervals with moment gradient factor C_b = 1.75 calculation per AISC 360-16 Chapter F"
bom_nodes:
  jib-sections:
    type: "part"
    urn: "URN:CNFX:ME:JIB_SECTIONS"
    interface_type: "physical-logic-coupled"
  trolley-rails:
    type: "component"
    urn: "URN:CNFX:ME:TROLLEY_RAILS"
    interface_type: "physical-logic-coupled"
  jib-tie-backstay:
    type: "component"
    urn: "URN:CNFX:ME:JIB_TIE_BACKSTAY"
    interface_type: "physical-logic-coupled"
  jib-foot-connection:
    type: "part"
    urn: "URN:CNFX:ME:JIB_FOOT_CONNECTION"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 4309:2010 - CRANES - WIRE ROPES - CARE, MAINTENANCE, INSTALLATION, EXAMINATION AND DISCARD"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 13001-2:2021 - CRANE SAFETY - GENERAL DESIGN - PART 2: LOAD ACTIONS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/jib-boom.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "32ccfb86882002f568b6db6f77871698e484c7134df2544883e0fe406fe36f92"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Jib (Boom)

## 1. Technical Definition
The horizontal structural member of a tower crane that extends outward to provide reach for lifting and moving loads.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **15-80 m**. Failure boundary: **Maximum bending moment of 4500 kNВ·m at 0.7L from tower connection**, Mechanism: **Euler-Bernoulli beam theory elastic buckling at critical stress Пѓ_cr = ПЂВІEI/(KL)ВІ where Пѓ_cr в‰¤ 250 MPa yield strength of S355 structural steel**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Fatigue crack propagation from cyclic loading exceeding О”K_th = 5 MPaв€љm threshold | 8 | Catastrophic brittle fracture at welded flange-to-web connection | Ultrasonic phased array inspection every 5000 operating hours with crack growth rate monitoring using Paris' law da/dN = C(О”K)^m |
| Lateral-torsional buckling instability at slenderness ratio О» &gt; 120 | 8 | Sudden jib collapse under combined bending and torsion | Stiffener plates at 2.5 m intervals with moment gradient factor C_b = 1.75 calculation per AISC 360-16 Chapter F |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | m | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Jib Sections](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/jib-sections.md) `(Standalone System)`
- [Jib Foot Connection](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/jib-foot-connection.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Tower Crane Mast**, **Hoist Mechanism**, **Counterweight System**  
**Downstream Applications**: Construction Projects, Heavy Equipment Installation, Prefabricated Building Components  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are used in manufacturing jib booms for tower cranes?
**A**: Jib booms are constructed from high-strength structural steel to withstand heavy loads and provide durability in industrial environments.

### Q: How does the jib tie (backstay) contribute to crane stability?
**A**: The jib tie or backstay provides critical tension support, counterbalancing the load on the extended jib to maintain structural integrity and prevent deflection.

### Q: What maintenance is required for jib trolley rails?
**A**: Regular inspection for wear, lubrication of moving parts, and alignment checks ensure smooth trolley operation and prevent premature component failure.

## 6. Manufacturing Compliance
- ISO 4309:2010 - CRANES - WIRE ROPES - CARE, MAINTENANCE, INSTALLATION, EXAMINATION AND DISCARD
- DIN EN 13001-2:2021 - CRANE SAFETY - GENERAL DESIGN - PART 2: LOAD ACTIONS

---
### рџ› пёЏ Engineering Resource Access
рџ”— **[Full Specification: Jib (Boom)](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/jib-boom)**

### рџЊђ Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: JIB_BOOM | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 6a6a6c72
