Publish Time: 2025-02-15 Origin: Site
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● Understanding the Scaffold Runway System
● Key Design Considerations for Maximum Stability
● Best Practices for Design and Implementation
● FAQ
>> 1. What is a scaffold runway system?
>> 2. How do I determine the appropriate load capacity for my scaffold runway system?
>> 4. What tests are required after installing a scaffold runway system?
A scaffold runway system is an invaluable asset on construction sites, enabling the safe and efficient movement of materials, particularly when used with hoists[6]. However, its effectiveness hinges on its stability. Designing a scaffold runway system for maximum stability requires meticulous planning, careful component selection, and adherence to safety standards. This article explores the key considerations in designing a stable scaffold runway system, supported by technical information and best practices.
A scaffold runway system typically consists of a horizontal track suspended from a scaffold structure, along which a trolley or hoist can move to lift and transport loads[1]. The system clamps onto existing scaffolding, offering a flexible solution for material handling[2]. The primary goal of the design is to ensure that the system can bear the intended load safely and without excessive deflection or risk of collapse[1].
1. Load Capacity (SWL/WLL)
- The first step is to determine the Safe Working Load (SWL) or Working Load Limit (WLL) required for the scaffold runway system[1]. This dictates the selection of appropriate components, including the track, trolley, and support structures.
- Niko's scaffold runway systems, for example, offer various load trolleys to accommodate different SWLs, ranging from 80 kg to 2000 kg[1][2].
- Example: If you need to lift materials weighing up to 500 kg, you would select a load trolley and track system rated for at least that weight[1].
2. Track Selection and Layout
- The track must be robust enough to handle the maximum expected load without excessive deflection.
- Available in straight and curved sections, the track layout should optimize material flow and minimize unnecessary bends or inclines[2].
- The modular design allows for easy extension and reconfiguration to suit changing site conditions[2].
- Example: Use straight tracks for long, linear movements and curved sections for navigating corners. Junction switches can be added for changes in direction[2].
3. Support Structure and Spacing
- The scaffolding itself must be strong enough to support the weight of the runway system and the loads it will carry[1].
- Ensure the scaffolding design is strong enough to support the runway system weight and has enough support points to suspend it from. Support point loadings can be supplied upon request[1].
- Intermediate supports are positioned along the track lengths at specified intervals to prevent sagging and maintain stability[1]. The support centers depend on the specific system and the load[2].
- Example: For an SRS24 system with a 125 kg capacity, the track support centers should be no more than 1.0 meter apart[2]. For an SRS27 system with a 1600kg capacity, the track support centers should be no more than 1.0 meter apart[2].
4. Bracing and Connections
- Proper bracing is essential to prevent lateral movement and ensure the overall stability of the scaffold structure[5].
- Horizontal members should be adequately secured to prevent lateral movement and should not have splices between support points[7].
- Connecting devices between frames should provide positive engagement in tension and compression[7].
- Example: Use cross bracing on the scaffolding to resist wind loads and maintain structural integrity.
5. Foundation and Ground Conditions
- Scaffolds must be installed on surfaces that can adequately support the loads they apply[4].
- The ground must be well- compacted and leveled. Mud and soft soil should be replaced with compacted gravel or crushed stone[4].
- Scaffolds installed on any type of soil or gravel must be supported by a sill plate[4].
- Example: Use sill plates made from spruce, pine, or fir (SPF) planks that are a minimum of 50 mm x 250 mm (2 in. x 10 in.) to distribute the load evenly[4].
6. Anchoring and Tie- Ins
- The scaffold should be adequately secured at vertical intervals not exceeding three times the least lateral dimension of the scaffold, measured at the base, to prevent lateral movement[7].
- If mesh, netting, or knotted tarp is added to a scaffold structure, the design drawing for the scaffold must be re- engineered by a professional engineer to include these elements, ensuring the scaffold can withstand potential wind forces[8].
- Example: Tie the scaffold to the building at regular intervals to provide additional stability, especially in windy conditions.
7. Fall Arrest Compatibility
- Some components of the scaffold runway system should be approved per EN795 for fall arrest, providing an additional layer of safety for workers[2].
1. Pre- Installation Checks: Before installing the system, ensure the scaffolding design is strong enough to support the runway system weight and has enough support points to suspend it from[1]. Also ensure that the system will be fitted onto a level scaffolding structure[1].
2. Testing: After installation, thorough testing must be carried out by a competent person before the system is put into service[1]. Tests include:
- Deflection Test: Measure deflection at SWL, ensuring it does not exceed 1/300th of the span between supports or 1/200th of the cantilever length[1].
- Proof Load Test: Apply 125% of SWL[1].
- Function Test: Verify proper operation of all components[1].
- Static Test: Apply 125% of SWL[1].
- Dynamic Test: Apply 110% of SWL[1].
- Consult with a qualified engineer to ensure the scaffold runway system is designed and installed correctly.
- Adhere to all relevant safety standards and regulations.
- Regularly inspect the system for wear and tear, and perform maintenance as needed.
- Provide comprehensive training to workers on the safe use of the system.
Designing a stable scaffold runway system demands a holistic approach that considers load capacity, track layout, support structure, bracing, foundation, and anchoring. Adhering to safety standards, performing thorough testing, and implementing best practices will ensure a safe and efficient material handling solution on any construction site. By carefully considering each design element and prioritizing safety, construction companies can maximize the benefits of a scaffold runway system while minimizing the risks.
A scaffold runway system is an overhead track system attached to scaffolding, designed to support and move materials using trolleys or hoists[6].
Determine the Safe Working Load (SWL) or Working Load Limit (WLL) required for the system based on the heaviest materials you will be lifting[1]. Select components, such as the track and trolley, that are rated for at least that weight[1].
Ensure the scaffolding is strong enough to support the weight of the runway system and the loads it will carry[1]. Properly space intermediate supports to prevent sagging[1]. The ground must be well-compacted and leveled[4].
Required tests include a deflection test at SWL, a proof load test at 125% SWL, a function test, a static test at 125% SWL, and a dynamic test at 110% SWL[1].
Engaging a qualified engineer is critical to ensure that the system is designed and installed correctly, meets all safety standards and regulations, and can safely handle the intended loads[7][8].
[1] https://niko.co.uk/bmcms/uploads/Scaffolding%20Runway%20Handbook%2006-2018.4.pdf
[2] https://www.ulslifting.com/lifting-equipment/scaffold-runway-system/
[3] https://www.niko.eu.com/wp-content/uploads/2019/08/Scaffolding_runways_June_2019_UK.pdf
[4] https://www.safemanitoba.com/Page%20Related%20Documents/resources/GD_ScaffoldsAndOtherElevatedWorkPlatforms_16SWMB.pdf
[5] https://search-ohs-laws.alberta.ca/legislation/occupational-health-and-safety-code/part-23-scaffolds-and-temporary-work-platforms/
[6] https://liftingequipmentstore.com/products/scaffold-runway-system-for-hoists
[7] https://ohsguide.ihsa.ca/en/topic/scaffolds_safeguards
[8] http://www.ontario.ca/page/achieve-compliance-construction-sites-access-and-egress-work-area