WARNING Do not stand on or under liftwell while it is being lifted. This could result in personal injury or death.
- Do not drop or impact the liftwell.
- Liftwells should be stored horizontally and chocked, using only appropriate materials such as sandbags, tires, or other soft or pliable materials.
- Upon liftwell delivery and when lifting liftwell, visually inspect entire exterior surface of the liftwell for shipping or handling damage.
- If the liftwell must be moved by rolling, ensure that ground to be traversed is smooth and free of rocks, debris, or other hard objects.
- Do not roll or set the liftwell on any pipe stubout, accessory or appurtenance installed on the liftwell.
- The contractor is responsible for rigging, unloading and securing the liftwell.
- When lifting the liftwell in the horizontal position, use two slings with a spreader bar.
- Use a minimum of two lift lugs when pivoting the liftwell from horizontal to vertical.
- Utilize all lift lugs provided at the liftwell top for vertical lifting.
- Only a pliable strap or rope should contact the liftwell, do not use chains, steel cables or hard metallic slings.
Dimensions of the excavation should be wide enough to provide sufficient working room around the liftwell.
WARNING Collapsing excavation walls can cause injury or death. Do not enter the liftwell excavation unless necessary and in compliance with OHS regulations. Follow OHS guidelines for excavations.
LIFTWELLS Lower Liftwell onto Compacted Base then place Wet concrete around the Unit, until it covers the lock-in Rib plus meets the Ballast Quantity.
ANTI FLOATATION RING CONCRETE SLAB Use minimum 20 mpa concrete for anti-floatation and ballast Final concrete depth, size, thickness and reinforcements shall meet the minimum requirements in the instructions and applicable tables.
CAUTION Voids in the concrete slab around external structural anchors will result in product damage and environmental contamination.
Proper backfill selection and compaction are required for a proper installation.
CAUTION Not using approved backfill material may result in tank failure and environmental contamination.
If the liftwell is installed in the same excavation as an underground fibreglass tank, the backfill around the liftwell must also meet the tank backfill requirements so as to not compromise the tank installation. Tank backfill requirements are more restricted and stricter conformance to the tank backfill requirements in MAN 600 must be met for both the liftwell and tank.
CAUTION Always wear safety glasses and protective clothing when cutting on the liftwell, failure to do so can result in personal injury.
- Pipe penetration cutouts should be round holes and should be no larger than the pipe diameter plus 25mm.
- Accessories must be installed and used in strict accordance with the manufacturer’s instructions.
- All piping must have a flexible connector installed directly on the fitting or accessory to allow for a minimum 15mm differential settlement between the liftwell and the pipe.
- A flexible joint on each connecting pipe is required to relieve stresses from differential backfill movement or soil consolidation. Backfill should be added to the invert elevation of each connecting pipe, the connection made and sealed, before continuing to backfill.
WARNING To prevent fire or explosion hazard, Protec FRP recommends air driven tools whenever possible. DO NOT use power tools where flammable vapors or liquids exist. Also, when electric hand tools are used, be aware of potential shock hazards. Wear protective clothing and eye protection. Liftwells may be a confined space. Follow proper safety procedures.
Invert specified by Certified Engineer. The invert may be at any angle and may project up the liftwell any distance.
The liftwell is designed to support the dead weight of a thick square pad. The concrete pad must be designed to be self-supporting after cured. The pad shall be specified by the Certified Engineer.
FIBREGLASS FLAT TOPS WITHOUT TRAFFIC LOAD
- The pad must be larger than the liftwell a minimum of 300mm in all directions.
- Maximum 200mm concrete pad thickness.
FIBREGLASS FLAT TOPS WITH TRAFFIC LOAD
- The pad must be larger than the liftwell a minimum of 600mm in all directions.
- The Certified Engineer shall specify the pad strength and reinforcement so that the static weight of an 200mm thick square pad (no more than 600mm larger than the diameter of the liftwell centred on the liftwell) along with a dynamic T-44 traffic load must be distributed on the liftwell perimeter and not on the interior of the lid.
- If either the static pad load or the dynamic traffic load is exceeded, all of the pad and / or traffic loads must be supported by the soil around the liftwell and not by the liftwell itself.
CAUTION: Never allow an empty tank to remain in a wet hole, or a dry hole that may become wet unless anchoring and backfilling have been completed. Failure to anchor and backfill may damage the tank or surrounding property.
Firstly, make site preparation as per previous section.
Pump the water from the hole to maintain minimum water level. Add a minimum of 300mm of well-placed backfill material (Must Be Crushed Gravel) to the hole, and level the bed to assure uniform bottom support for the tank. Position the tank in the hole.
Partially ballast tank using water until it settles firmly on the prepared bed. Ballast level in a tank must never exceed water level in hole during installation. Use only enough ballast to sink the tank. One tank is level and ballasted, carefully place concrete ballast as per section C. then processed to sections D, E (if applicable), F, G and H.