jnpgroup services provided:
- Structural Design
- Civil Design
- Surface Wwater Design
- Existing Building And Structure Investigation And Analysis
- RC Duct Design And Detail
- Tanking Advice
- Construction Method Statements
Effluent Facility
The project was to provide a new temporary effluent facility and refurbishment of an existing facillity between two working laboratory buildings at the grove centre for GE Healthcare. jnpgroup were appointed as structural and civil consultants for both phases of the work.
The Site
The existing effluent facility which served two working laboratory buildings, was built in the 1950’s and was in need of restoration. The work had to be carried out without affecting laboratory operations or production. Therefore a temporary effluent facility had to be constructed to divert services and thus allow the original facility to be refurbished.
The Design
The existing below ground facility was poorly lit and was difficult to access plus the roof to the facility occupied valuable yard area between the buildings. Recent surveys had highlighted issues with the open double containment tanks and therefore a new facility or refurbished facility was required. To provide this facility the existing one had to be demolished and a temporary facility built to keep the labs operating.
The temporary system required the construction of a below ground tank with accessible ducts. The tank had to be double contained and installed as a water tight chamber in an area frequently used by forklift trucks, in close proximity to the neighbouring buildings, the existing below ground facility, services and ducts. Precast ring chambers were set on a concrete base with all the ring joints sealed with a specialist material before installing the tank. Once the tank was in place with all pipework joint s connected from the ducts a precast concrete lid was carefully placed over it.
Once the temporary facility was up and running the existing facility was decommissioned and removed. The existing structure was then surveyed and reviewed taking note of the proposals to install new double contained stainless steel tanks within the facility below. The existing tanks were removed and their concrete support structure was modified to suit the requirements of the new facility with the construction of new walls and raised floors before the entire below ground facility was coated in a specialist water resistant tanking material “Metflex”.
The stainless steel tanks were then delivered to site and craned into place. Their actual positions were then surveyed to establish accurate positions for new access ladders and walkways to be designed and detailed. These were required to access pipe connections and monitoring points, whilst establishing structural support locations.
Once the below ground facility was in place the roof to the facility could be constructed. This was to be built in precast concrete and provided with a water tight surface suitable for use with forklifts but it had to be removable, in case one of the tanks had to be taken out in the future. Therefore the location of each plank and the access buildings had to be carefully planned.
The floor planks were provided with a structural topping which was coated in “Metflex” before a laid to fall screed was placed over the surface. The main access housing was provided with a lifting beam to assist with the removal of pump sections and required removable sections of floor to be detailed in the correct place.
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