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Safety Distance Standards for Personnel Within the Working Radius of the Wet Spray Boom Arm
Release time:
2025-12-22
Source:
Author:
Summary:
I. Basis for Safety Distance Standards
According to GB 50870-2013, "Unified Standard for Safety Technology in Construction," and ISO 21873-2:2009:
1. Basic safety radius = Maximum boom extension length × 1.2
2. Dynamic work zone = Base radius + 3m buffer zone
3. Minimum clearance distance = Turning radius + 5 m
Typical numerical reference:
20m-class boom: Safe radius 24m + 3m buffer
30m-class boom: Safe radius 36m + 3m buffer
II. Tiered Management of Hazardous Areas
| Area Type | Range Definition | Personnel Control Requirements |
| Core Hazard Zone | Sector within ±120° directly below the boom | Entry of any personnel is strictly prohibited |
| Secondary Alert Zone | Non-core area within the safety radius | Only licensed operators permitted |
| Peripheral Monitoring Zone | Buffer Zone Range | Install Physical Barriers |
III. Security Protection Technical Measures
1. Intelligent Anti-Collision System: Laser scanner (detection range: 0.5–30 m); ultrasonic sensors (covering blind spots); emergency stop response time ≤ 0.3 seconds.
2. Mechanical Limit Devices: Hard limit switches (redundant design); angle encoders (accuracy ±0.1°); load limiters (automatic locking upon overload).
3. Visualization aids: LED warning lights at the boom’s end; ground projection warning lines; audio-visual alarm system (>85 dB).
IV. On-site Management Standards
1. Pre-job preparations: Check the effectiveness of all safety devices; remove any obstacles within the radius of operation; conduct a safety briefing (all relevant personnel must sign).
2. Operational Control: Assign a dedicated safety officer for each piece of equipment; maintain unobstructed communication (using a walkie-talkie system); immediately halt extension if wind speed exceeds 8 m/s.
3. Emergency Handling
Mechanical locking activated in the event of a sudden power outage.
Personnel entering accidentally triggered a Level 3 alarm:
Level 1: Automatic Speed Reduction
Level 2: Stop the action
Level 3: Emergency Recall
V. Handling Special Operating Conditions
1. Cross-operation: Maintain a clear distance of 10 meters from other equipment; implement staggered construction agreements.
2. Confined spaces: Reduce the working radius to 80%; increase observation posts (one post every 15 meters).
3. Nighttime construction: Illuminance ≥ 50 lux; reflective markings cover the entire surface.
VI. Key Points for Training and Assessment
1. Operators: 8-hour specialized training annually; simulated emergency drills (quarterly).
2. Other personnel: Safety awareness education (before entering the site); periodic refresher training (twice a year).
3. Assessment criteria: Theoretical exam (≥90 points); practical skills assessment (100% compliance).
VII. Accident Case Analysis
A warning about a tunnel construction accident: Unauthorized entry into the core zone (within 3 meters of the boom arm); failure of the safety system (sensor not calibrated); direct economic loss: 850,000 yuan.
Corrective measures: Upgrade dual-system protection; add physical fencing; strengthen pre-duty inspections.
By strictly enforcing safety distance management, the accident rate can be reduced by more than 90%. It is recommended to establish a three-in-one protection system comprising "human defense + technological defense + institutional defense."
RELATED INFORMATION
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
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