GB/T 1955-2019 in English
VALIDConstruction winch
- Issued on:2019-10-18
- Implemented on:2020-09-01
- File Format:PDF
- Delivery:Via email within 5 business days
$534.00
| Standard No: | GB/T 1955-2019 |
| Document status: | VALID |
| Title in English: | Construction winch |
| Title in Chinese: | 建筑卷扬机 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-10-18 |
| Implemented on: | 2020-09-01 |
| Superseding: |
GB/T 1955-2008 Construction winch
|
| Professional Classification: | GB-National Standard |
| Related Keywords: | steel core wire rope accurate calculation
construction winch introduction standard evolution high load conditions wire rope factor no distinction wire rope selection calculation diameter calculation formula wire rope |
| Related Topics: | gb/t1955-2002
gb/t1955 Machine Construction Instruments gb1955 construction hoist GB/T1955-2019 GBT1955 GBT1955-2002 GBT1955-2008 GBT1955-2019 hoist Construction hoist safety regulations Construction Pop Roller Safety Assessment gb/t1955-2017 gbt1955-2019 |
《GB/T 1955-2019建筑卷扬机》由TC328（全国建筑施工机械与设备标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Standard Evolution and Major Technical Changes
| Changed Items | 2008 Edition | 2019 Edition | Technical Significance |
|---|---|---|---|
| Scope of Application | Horizontal/inclined working conditions are not specified | Extended to horizontal/inclined moving loads | Adapt to more complex engineering scenarios |
| Brake Torque Requirements | 1.5 times below M6 | 1.75 times of M6 and above | Improve safety under high load conditions |
| Wire Rope Factor | No distinction between steel core types | Added K'2 coefficient for steel core wire rope | Accurate calculation of breaking force |
Core parameter system
1. Working level division
According to the load state and total working time, the winch is divided into 8 levels from M1 to M8:
| Load state | Nominal load spectrum coefficient Km | Typical application scenario |
|---|---|---|
| Light | 0.125 | Occasional lifting of light materials |
| Medium | 0.250 | Conventional construction |
| Heavy | 0.500 | Frequent lifting of heavy equipment |
| Extra heavy | 1.000 | Special scenarios such as petrochemical and mining |
2. Key design parameters
- Safety factor of wire rope: Increasing from 3.15 for M1 to 9.0 for M8
- Drum pitch ratio: Positively correlated with the working level (11.2 for M1 to 25 for M8)
- Braking distance≤1.5% of the rated speed in 1 minute
Analysis of key technical requirements
1. Braking system specifications
Non-slipping winches must be equipped with normally closed brakes, and the braking torque requirements are:
| Working level | Torque multiple | Verification method |
|---|---|---|
| M1-M5 | ≥1.5 times static moment | 125% rated load overload test |
| M6-M8 | ≥1.75 times static moment |
2. Wire rope selection calculation
Diameter calculation formula: d ≥ C√Fe, where the coefficient C needs to be determined according to the wire rope type:
| Wire rope type | Natural fiber core K' | Independent steel core K'1 |
|---|---|---|
| 6×7 | 0.332 | 0.359 |
| 8×19 | 0.293 | 0.346 |
Implementation Suggestions and Maintenance Points
1. Selection Guide
- Select the working level according to the average daily working time (see Appendix A Table A.2)
- M6 and above levels should be selected in special environments such as mines
- When using double drums, the total load must not exceed the rated value of a single drum
2. Safety Operation Specifications
- The wire rope outside the reference layer needs to be unloaded according to the instructions
- Rope angle control: grooved drum ≤4°, smooth drum ≤2°
- Check the wear of the brake daily
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