In the infrastructure industry, a three-arm arch installation trolley is a crucial piece of construction equipment, widely used in large-span, high-rise, or complex structure construction. Its unique structural design and efficient performance provide a convenient and safe working environment for construction workers. The three-arm arch installation trolley offers many advantages in tunnel construction, including:
1. Multi-arm collaborative operation reduces process transition time.
Equipped with three independent hydraulic working arms (typically consisting of a grabbing arm, an adjustment arm, and an auxiliary fixing arm), the equipment simultaneously completes the entire arch installation process: grabbing, transporting, positioning, temporary fixing, and bolting. This eliminates the need for manual relocation or waiting for individual arms to alternate between operations. For example, traditional manual installation of a single arch requires 8-12 people and takes 1.5-2 hours. A three-arm trolley requires only 3-5 people (operator and assistant), reducing the installation time to 30-45 minutes, increasing efficiency by 2-3 times.
2. Automated Assistance Reduces Time-Consuming Manual Intervention
Most mainstream three-arm trolleys integrate features such as hydraulic synchronous drive, one-touch homing, and preset arch spacing, eliminating the need for manual adjustment of arch positions. Some high-end equipment also supports "arch pre-assembly + trolley hoisting" mode, eliminating fragmented assembly within the tunnel and further shortening operation time.
3. Reduced Exposure to High-Risk Areas
Operators can operate from the trolley's cockpit or safety platform, eliminating the need to stand on temporary scaffolding or arches to perform manual lifting or high-altitude bolting. This completely eliminates key risks such as falls, impacts, and rockfall.
4. Comprehensive Equipment Safety Features
The trolley is equipped with stabilizing legs to prevent overturning, an emergency brake system for rapid shutdown in emergencies, and boom anti-collision sensors to prevent scraping against the tunnel wall or surrounding rock. The crawler-type travel mechanism adapts to uneven tunnel surfaces, minimizing the risk of equipment instability.
5. Laser positioning + 3D posture monitoring, ensuring millimeter-level error control
The equipment is equipped with a laser guidance system, inclination sensors, and displacement sensors, enabling real-time alignment with the tunnel's designed axis and automatic adjustment of the arch's horizontal and vertical position. This ensures a single arch's axis deviation of ≤50mm and verticality deviation of ≤2°, far exceeding the ±100mm tolerance standard for manual installation.
6. Hydraulic rigid support prevents arch shifting after installation
The boom features a highly rigid hydraulic locking function, which stabilizes the arch after positioning until the bolts are fully tightened. This prevents arch sinking or shifting caused by temporary manual fastening (such as wire tying), ensuring the integrity of the support structure.
7. Reduced Labor Costs: Compared to a traditional 12-person team, the trolley only requires 4-5 people. Based on a one-year tunnel construction cycle, this can save approximately 1-2 million yuan in labor costs.
8. Reduced Rework Costs: High-precision installation reduces the need for dismantling and reinstallation due to arch frame misalignment, thus avoiding material waste (the cost of a single I-beam arch frame is approximately 5,000-10,000 yuan).
The core value of the three-arm arch frame installation trolley lies in addressing the industry's pain points of low efficiency, high risk, and poor precision in tunnel arch frame installation by replacing manual labor with mechanization, improving precision through automation, and enhancing efficiency through multi-arm collaboration. It is particularly suitable for the rapid construction needs of long and large tunnels with complex geological conditions (such as high-speed rail tunnels and long highway tunnels), and is a key piece of equipment in the transition of modern tunnel engineering towards mechanization and intelligence.