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Technical Guidance for Stability Control of Boom Arms in Wet-喷 Machine Construction of Inclined Shafts
Release time:
2025-12-25
Source:
Author:
Summary:
I. Typical Operating Conditions for Inclined Shaft Construction
Common construction parameters:
1. Tilt angle range: 15°–35° (maximum not exceeding 40°)
2. Shaft dimensions: diameter 4.5–6 m
3. Concrete spraying rate: 8–15 m³/h
II. Factors Affecting Stability
| Risk Factor | 15° Inclined Shaft | 30° Inclined Shaft | Control Requirements |
| Downward Force | 25%G | 50%G | <5% of Rated Load |
| Lateral Swing | ±1.2m | ±2.5m | <0.8m |
| Hydraulic Oil Level Difference | 15 cm | 30 cm | <10 cm |
III. Key Control Technologies
1. Leg Adaptive System: Pressure-compensated cylinder (adjusting speed: 0.5 m/min); three-dimensional tilt sensor (accuracy: 0.1°).
Calculation formula:
F_{leg} = \frac{G \cdot \sinθ + F_{jet}}{4 \cdot \cosα}
(θ = well inclination angle, α = leg deployment angle)
2. Dynamic balancing of the boom: Real-time adjustment of counterweights (adjustable from 0 to 500 kg); hydraulic dampers (damping ratio > 30%).
Speed Limit for Movement:
| Action | Level Roadway Speed | Inclined Shaft Speed |
| Stretch | 0.8 m/s | 0.3 m/s |
| Rotation | 1.2°/s | 0.5°/s |
3. Jet Reaction Compensation: Pressure-Flow Coupled Control
Recoil Prediction Model:
F_{recoil} = 0.16 \cdot Q \cdot \sqrt{P}
(Q = flow rate, m³/h; P = pump pressure, MPa)
IV. Security Monitoring System
1. Sensor Configuration**
| Type | Measurement Range | Accuracy | Installation Position |
| Inclinometer | ±45° | 0.01° | At the joints of each arm section |
| Strain Gauge | 0-5000 με | 1 με | Critical Weld Seam |
| Pressure Transmitter | 0-40 MPa | 0.1 MPa | All Cylinders |
2. Tier-3 Early Warning Mechanism
| Alert Level | Triggering Conditions | System Response |
| Beginner | Tilt deviation > 2° | Audio-visual alarm |
| Intermediate | Leg Pressure Difference > 8t | Automatic Leveling |
| Emergency | Vibration > 0.8g | Emergency arm retraction |
V. On-site Operation Standards
1. Construction Preparation: Wellbore scanning (to generate a 3D point cloud model); foundation treatment for support legs (bearing capacity > 0.2 MPa); no-load stability test (lasting 5 minutes).
2. Injection phase
A [Downhill Section] --> B [First Spray the Waist of the Arch]
B --> C [Segment Upward Shift]
C --> D [Final Cap]
3. Relocation Procedure: Retract the boom to the transport position; alternately extend and retract the outriggers (with a height difference of less than 20 cm each time); relocation speed < 0.2 m/s.
VI. Handling Special Operating Conditions
1. In the event of sudden water inflow: Immediately stop spraying; activate the hydraulic lock; and retract the equipment to a safe platform.
2. Rock layer fracturing: Reduce jetting pressure (by 30%); shorten the jetting distance (to 0.8–1 m); increase the amount of rapid-setting agent (by +2%).
3. Equipment failure: Backup power source activated (maintains operation for 30 minutes); mechanical locking device engaged; emergency lighting system activated.
VII. Key Points for Maintenance and Care
1. Daily inspections: Lubrication of outrigger slides (lithium-based grease); hydraulic oil contamination level (NAS 8 grade); detection of cracks in structural components (penetrant testing).
2. Regular maintenance
| Project | Plain Cycle | Inclined Shaft Cycle |
| Leg Bearing | 1000h | 500h |
| Hydraulic Oil | 2000h | 1000h |
| Steel wire rope | 6 months | 3 months |
8. Training and Assessment Standards
1. Theoretical Training: Mechanical Analysis of Inclined Shafts (4 academic hours); Emergency Response Procedures (2 academic hours).
2. Practical Assessment: 30° inclined shaft positioning accuracy (±5 cm); emergency arm-retraction operation (<60 seconds); system fault diagnosis.
3. Certification Requirements: A score of ≥90 on the theoretical exam; zero errors in practical operations; monthly refresher training.
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
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