Geocast System
With the assistance of laser-guided accuracy, the Geocast System vertically excavates and continually casts, steel reinforced concrete retaining walls.
Because the Geocast System can work safely within 50mm of adjacent structures, it's able to provide architects and developers the benefit of including additional car spaces when planning underground car parks.
This in turn may increase the allowable number of apartments within a building, under council regulations.
The Advantages of the Geocast System
- Time saving due to its speed of construction
- Ability to work 50mm off the face of an adjoining boundary wall
- Water resistance - gives the ability to excavate in dry conditions
- No vibration which eliminates damage to adjoining structures
- Minimal noise
- Acceptable surface appearance
- Walers are not required when allowing for temporary sand anchors or internal bracing
All walls are designed and certified by our external consulting engineer, The Geocast System is operated as a six step process:
- Set up lasers
- Insertion of arm into ground
- Delivery of concrete and mixing of fibre into concrete truck
- Delivery of concrete through concrete pump to Geocast machine
- Arm commences trenching with sand being removed & simultaneously reinforced concrete being poured down back of the arm
- When section of wall completed, insert reinforced bars into wet concrete of Geocast wall
Engineering Specifications
Shoring Walls to Car Parks
The Geocast System specialises in creating underground shoring walls for basement car parks, with excavation possible to within 50mm of adjacent buildings. No other system can excavate to this proximity. After wall casting underground, the site is excavated to basement level and temporary sand anchors are installed for stability. The basement slab is then cast and the anchors removed – as permanent bracing is provided by the structure.
Watch Video
Geocast Walls in Water-charged Ground
In water-charged ground the Geocast system utilises a dewatering spear and continuous pumping to lower the water table while wall casting commences. The site is then excavated to basement level, temporary anchors installed and basement slab cast. The dewatering spears are then removed and the basement completed.
Watch Video
Geocast Walls for Multi-level Car Parks
The Geocast System can be applied to the construction of multi-level car parks. The normal process of Geocast underground shoring wall casting is carried out, then after site excavation to basement level, 3 rows of temporary anchors are installed. In Stage 2, the Geocast machine returns to caste a second level of underground shoring walls, with 3 more rows of temporary anchors then installed. Permanent bracing is provided by the structure when it is completed.
Watch Video
Tunnel Portals in Soft Soil Conditions
The Geocast System can be applied in the construction of underground tunnel portals in soft sand conditions. The System simultaneously excavates and castes two adjacent walls underground, followed by tunnel excavation and installation of temporary sand anchors. The final stage involves excavation to full tunnel depth, casting of basement slab, de-stressing of sand anchors and casting of concrete roof.
Watch Video
Cut and Cover Walls for Underpass Road Projects in Soft Soils
The Geocast System proves extremely effective in the creation of cuttings for road projects. By creating the retaining walls before excavation, time and stabilisation are both maximised. The inherent strength of the Geocast wall after excavation means it can be used to support overpasses above the excavated underpass.
Watch Video
Casteening and Seam Plotting for Shallow Sub-surface Mineral Deposits
The Geocast System can also be successfully used in the application of seam plotting when planning the mining of alluvial mineral deposits. In large areas, the Geocast machine excavates while samples are taken. The mineral seam is plotted across the excavated path to illustrate the deposit quickly and easily.
Watch Video
Construction of Road Barriers and Retaining Walls
Geocast walls can also be used in the construction of road barriers and retaining walls. By leaving the additional lengths of steel reinforcement bars in place, a concrete barrier can be constructed as a continuous barrier attached to the cantilever Geocast wall beneath the ground. The cantilever Geocast wall means it does not require temporary anchoring, and boast extraordinary strength to take high speed vehicle impact.
Watch Video
Contaminated Site and Water Seepage Control
In industrial areas where soil contamination is evident and the threat of seepage likely, the Geocast System can be applied to contain soil contamination within a specific area. As illustrated, the nature of the Geocast wall when combined with a basement slab, creates a seepage control wall to prevent contamination of surrounding properties. The surface land can then be released for commercial uses.
Watch Video
Levee Bank Construction
Geocast walls are a successful solution to give consolidation to levee banks, especially in flood-prone environments where the levee bank could be weakened by erosion. The Geocast wall is installed beneath the ground, at a greater depth than the height of the levee bank. It remains almost invisible unless severe erosion causes the levee bank to be compromised, and where nearby property would be threatened in this case, the Geocast all prevents flooding.
Watch Video
Foreshore Erosion Protection
Similar to using the Geocast System to support levee banks, it can also be applied to foreshore erosion protection in ocean-side environments that may have inferior, older forms of foreshore protection. The Geocast wall is caste immediately behind the existing barrier at a much greater depth. The old retaining wall is removed and the foreshore protected from erosion by the depth and cantilevered stability of the new Geocast wall.
Watch Video
Protection Walls to Foreshores
In ocean-side environments where protection walls to foreshores are required, the Geocast System offers a desirable solution. The wall is constructed close to the foreshore, offering significant depth and strength through its cantilevered design. The capacity for an additional section of wall above-ground can be utilised to protect the foreshore from wind, sea spray and soil erosion.
Watch Video
Other Services
Anchors
Geocast install their own temporary sand anchors
Nominal centres for each anchor is 3m
No walers are necessary for the anchors in a Geocast wall
Geocast can organise a Finite Element Analysis model of the Geocast wall and anchors (Wallap Analysis) if required
Excavation
Geocast can perform the excavation task if required
If anchors are to be installed, excavation needs to be done in stages which makes it more convenient if its done by Geocast
De-watering
Geocast has an alliance with Coates Shorco to undertake de-watering
Geocast through Coates Shorco can provide the flow chart modelling and water discharge testing