Kilmac were appointed by Highland Spring Ltd. to carry out the formation of a new concrete hard standing area.
Highland Spring Ltd. required to form a new concrete hard standing area at the East end of their premises to allow an increase to their current parking facilities for HGV trailer units. This involved the formation of a new concrete hardstanding area at approximately 1,900m2, to allow for an access road, turning circle, and adjacent parking for trailer units. Drainage run-off system required to be installed to accommodate this additional hardstanding area, and was accommodated for by installation of a filter drain, discharging into an interceptor unit prior to making its way to a water course. Safety vehicle barrier was also installed along the perimeter of the slab. A fast curing concrete mix design was utilised on this project to allow vehicles and site plant to run upon the surface after a period of only 12 hours from pour. This was required to allow the correct works sequence for forming the slab, and also maintaining vehicle access around the building perimeter, as well as an emergency services route. Kilmac worked with concrete suppliers to develop a mix that allowed the correct flow characteristics & workability on-site, to allow the concrete to be poured and finished to specification, but then had a rapid curing process allowing the concrete to be used for vehicular traffic only 12 hours after pouring.
Site Constraints & Requirements:
- An existing watercourse is present adjacent to the site and required to be protected throughout construction from any silt or contamination run-off. This was achieved by erecting a temporary geotextile membrane barrier sheet fence, toed in to the ground, adjacent to the work zone. Straw bales were also used to allow any water run-off from site to be filtered before it reached the final geotextile membrane barrier fence.
- Emergency access routes, which crossed through the site, were to be maintained throughout construction process. This was dealt with by meeting with Client to understand the requirements fully and to ascertain the routes required. Our construction plan and access routes were created to take cognisance of this.
- An upgrade to the existing storm water outlet was required, along with the installation of a new petrol interceptor unit. This was carried out using deep excavation principles and temporary ground shoring equipment. Environmental protection measures were implemented to ensure pumped water from the excavation was filtered both during and after the pumping process to minimise silt content of resultant flow from the excavation.
- Access & Egress to the site for delivery vehicles was restricted by the plant’s operating schedules, and were to be adhered to and programmed around accordingly. Notwithstanding these operating schedules, the local community was also of high consideration to minimise the impact of these works on the local traffic routes and residential areas. Traffic management routes and guidelines on maximum speeds, etc. were implemented and enforced by ourselves in order to achieve this minimal impact.
- Newly constructed concrete slab required a fast curing time in order to reach a suitable strength to allow vehicles to run upon same. This was due to the fact that the new slab was directly adjacent to the building and formed part of an emergency access route for fire fighting vehicles, and the like. We achieved this by speaking directly to concrete suppliers and designed a mix that met the strength characteristics and consisted of additives to allow a fast curing time. The pour sequence and construction joint layout of the slab was planned and designed to take cognisance of the access requirements to ensure vehicle access routes were maintained as much as feasibly possible.
- Ground Improvement. The footprint of the concrete slab area required to reach a suitable formation bearing strength to facilitate the resultant loading of its end use. We looked at the design of this structural formation, and designed a system using a plastic strengthening mesh layer incorporated within the construction make-up of stone aggregate.
Site clearance over 2,000m2
Topsoil scrape of 1,000m3
Excavate & disposal of 1,200m3 subsoil
Import to fill of 800m3 of 6F2 material
Geo-grid strengthening membranes to area of 2,000m2
Import to fill of 500m3 of Type 1 material
Re-grade to topsoil areas and grass cultivate at 200m2
In-situ Concrete Works
Construct a reinforced concrete external yard slab of 1,800m2.
Construct Filter drain at a length of roughly 120m, incorporating new manholes and Klargester oil interceptor, and upgrade to existing storm water outfall.
Supply & installation of roughly 200m of Armco barrier to perimeter of service yard.