CB/T 4513-2020 in English
VALIDThe design specification and fixing of hydraulic rack and pinionjacking system for self-elevating units
- Issued on:2020-09-14
- Implemented on:2021-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本标准规定了自升式平台液压齿轮齿条升降系统的设计、安装要求。
本标准适用于圆桩腿自升式平台液压齿轮齿条升降系统的设计、安装及检验。
Introduction
Analysis of the core content of the standard
CB/T 4513-2020 standard specifies the technical requirements for the full life cycle of the hydraulic rack and pinion jacking system of self-elevating platforms, with the key points including:
| Technical elements | Design requirements | Installation requirements |
|---|---|---|
| Load type | 6 types of working loads (including storm loads) | Dry dock/land installation conditions |
| Safety factor | Static load 1.67/combined 1.25 | Straightness ≤1mm |
| Redundant design | FMEA analysis mandatory requirements | Independent inspection space reserved |
Detailed explanation of key technical parameters
5.2.1 Load classification system
The standard establishes a three-level load system: rated load (normal operation), preload (storm simulation), storm load (limit condition). Among them, the preload support load is required to reach 120% of the storm value to ensure the system safety margin.
5.3.2 Brake device design
Adopt a fail-safe design, the static braking capacity formula is: TB=1.2×Tf/i, and the dynamic braking needs to consider the transmission efficiency η. A typical case shows that the braking torque of a 4,000-ton platform needs to be ≥850kN·m.
Key points of installation process
6.3.3 Precision control
After welding, the mounting frame must meet the following requirements: - Tolerance of center distance between lifting units of the same pile leg ±2mm - Wedge gap <0.1mm (feeler gauge detection) - Refer to GB/T 34000-2016 for structural alignment
6.4.7 Electronic control system
Dual-channel control design (centralized + pile side), tilt alarm threshold 0.5°, emergency stop requires independent circuit and forced reset.
Standard Evolution Analysis
Main upgrades compared to the previous version:
1. Added mandatory FMEA analysis clause (5.1.1)
2. Detailed calculation method for storm condition load
3. Clarified gear fatigue verification standard (tooth root safety factor ≥ 1.5)
Implementation suggestions
- Design phase requires simultaneous verification with CCS specifications
- Perform 3D laser scanning positioning before installation
- It is recommended to add an online rack wear monitoring system
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