3 developments tech spec sheet
- 1. Machine Specifications Technical specification of the machine: I Printer P1 (16m x 9m x 2,7m) I Concrete pump (13 kw, 20 bar, 7-180 l/min, 30m hose) I Nozzle (Φ 20, 30 or 50mm) I Concrete mixer (60-90 l/min, 4kw) I Air compressor (5 bar, 20l capacity) Wall Strengths The strengths of the wall depends on the types of cement mix used and we can use a whole range of different materials and testing is still going on and with different additives, here is a sample of test with one of our lower quality materials. Materials All concrete materials are sourced in accordance with the appropriate British Standard and in accordance with the ACP performance specifications. I Concrete typical 28 days strengths are 60N/mm² I Concrete strength at transfer 30 N/mm² I Water cement ratio 0.30 Maximum This includes are quick dry mix I Reinforcement typically 9.3mm dia. prestressing strand I We can use a number of materials, quick drying adhesive can be added to harden cement as we go along. Tolerances Cross-sectional tolerances are within limits set out in clause 6.2.8.3 of BS8110:1997. ACP acceptable tolerances for standard pressurised units are as follows I Length -5mm to +10mm I Width -0mm to +6mm I Thickness -2mm to +6mm I Squareness 12mm difference between diagonals I Socket positions -/+ 10mm I Lifter position -/+ 100mm I Flame Spread 4 or less I Smoke Contribution 0.0 or less Surface I Any flat surface can be built on but testing needs to be completed with regards weight loads and different types of surfaces. I Land should be level and straight and it is advised that the team could dig holes for the foundation and cement them and finish reinforced concrete slab. I More test will need to be done to see how the machine adapts to different surfaces. Assembly I A person with sufficient knowledge in housebuilding and programing in SketchUp, can learn to print with our printer in a few days. A mandatory course of training will be provided to operatives who have satisfied local Health and Safety and Construction site regulations and requirements. I The longest part of current printers is 6 metres at present. It is possible to make a printer that has smaller parts. I Assembly takes 4 operatives from 2-10 hours, dependent on their knowledge and ability. 3Developments Tech Spec sheet_Layout 1 28/07/2015 14:39 Page 1
- 2. Design All units are designed in accordance with BS 8110 and BS 5502. Unit design is typically to Class 3 with a limiting crack width of 0.1mm unless otherwise stated. Not all of the materials are approved for our printers, mixes would need to be supplied for testing before approval. Around 100 cubic metres of cement for a house of 12m x 8m would be required to be submitted for testing. I Maximum built area of printer is 16m x 8,5m. But this can be increased by moving the printer. I Holes / routes for plumbing, electrical and plug and go of fixtures and fittings can be incorporated in to the 3D CAD design as required so this is built into construction to minimise builders work for second fix items. Each house can be built bespoke so that all considerations can be taken into account by the machine for the particular build. I Trusses can be built and printed with the printer creating a strong surface. Any shape or structure that can be built with cement can be used and developed by the printer, usually to a higher standard. I The current printer model can print up to 2,70m in height. To print higher the printer can be raised with/on a support platform/scaffold I Foundation designs are as normal local requirements for a single storey brick house. I A house of 12m x 8m, would need approx. 100-150 cubic metres of material depending on design I The weight of the ‘ink’ or build material is 2,4 tons per cubic metre. It is packed in large bags that contain 1 cubic metre of material. I Each layer would be 15mm in height and would be 3o mm thick but we can vary this with our extruder based on conditions. I Current initial design require reinforcement at 3m (steel columns or reinforced concrete with steel reinforcing bars I A current partner we are working with is looking at including the bars into the print machine design but tests and meeting with building standards regulators that the strength in design of concrete pillars is more than enough strength to exceed building and safety regulations. I The technology is being used to build skyscrapers and is being developed by NASA to build in outer space so its adaptability is clear. I The material is mainly cement but we there are additives available for fast drying applications that allows it to set faster. Recycled and reclaimed concrete can be used in the printer after successful granulation as well as well as lavic ash based products I The material is an excellent insulator, which allows large amounts of heat be kept in the house. The material science team is presently experimenting with various mixes to improve this process. Build Details Residual Risks I The main cause of risk is the operative controlling the printer, and the quality of the mix pumped in to the printer. With the correct training and diligent operation risk is reduced. 3Developments Tech Spec sheet_Layout 1 28/07/2015 14:39 Page 2