Construction and Civil Contracting SLIPFORM CONSTRUCTION

Construction and Civil Contracting SLIPFORM CONSTRUCTION

Slipform construction of the building core on the Bishops See project in Perth, WA SLIPFORM CONSTRUCTION 2

The advantages of the slipform system include: Greater speed and earlier completion of construction projects SRG is a well established professional engineering and contracting operation with over 50 years experience. We are currently operating from offices throughout Australia as well as Hong Kong and the Middle East. SLIPFORM SPECIALISTS SRG provides a complete slipform service. We maintain experienced teams of personnel available to assist in all aspects of construction including design, planning, programming and construction techniques relating to slipforming methods. It is essential that our experienced slipforming personnel are included at an early planning stage to ensure maximum benefit of the slipforming process to your project. SRG are well equipped to undertake projects wherever the location. Our proven track record and experience, as well as our focus on safety, quality and environment ensures SRG are the right people for the job. safety, quality, environment Safety, Quality and the Environment are paramount to SRG. We believe that responsible health and safety management as well as superior health and safety performance is integral to an efficient and successful project. Being a customer focused organisation with an intense desire to be the best in our field, SRG operates and complies with the requirements of the following Quality Management, Environmental Management and Occupational Health & Safety Management Systems. Occupational Health & Safety Management System AS/NZS 4801:2001 OHSAS 18001 Quality Management System ISO 9001:2008 Environmental Management System AS/NZS ISO 14001:2004 SRG has gained Federal Safety Commission accreditation and is also a founding member of the Post-Tensioning Institute of Australia (PTIA). 3

SLIPFORM CONSTRUCTION Slipform construction of a cement silo for BGC Cement in Kwinana, WA. The slipform technique is a rapid and economical construction method that can achieve considerable cost savings when compared with the cost of conventional formwork. The slipform construction system becomes viable on regular shaped structures generally four storeys or greater in height. Shorter slipforms can be economical where there are a number of near identical structures. The advantages of the slipform system include: Off site assembly Greater speed and earlier completion of construction projects Early completion of lift motor rooms and early installation of lifts, plumbing and electrical services Reduced craneage as forms are lifted by hydraulic jacks Reduced scaffolding and temporary work platforms as the slipform system contains its own platforms for working. This also results in a cleaner and less congested construction site A uniformity of wall sections and layouts can be achieved with the slipform method. Reduced labour costs, as the system provides an intensive work environment The slipform process involves the continuous upward movement of formwork by means of jack rods and hydraulic jacks. The slipform system is a hydraulically operated formwork system. Six tonne hydraulic jacks are mounted on strategically located steel yoking frames to lift the formwork as the concrete is poured into the forms. The formwork system uses 1,066mm high steel panels held rigidly by a framework built up from steel waler frames, trusses and bracing. The framework provides rigidity to the slipform as well as support for timber decking to form a working platform for placement of concrete, reinforcement steel and blockouts for doors and windows. The slipform process explanation continues 4

TYPICAL SECTION THROUGH SLIPFORM SYSTEM FOR VERTICAL STRUCTURES Concrete is poured into the forms in layouts of approximately 200mm. The setting rates of concrete are constantly monitored to ensure that it is matched with the speed at which the forms are raised. The jacks lift the forms approximately 25mm per stroke, generally producing a slipforming rate of 300mm to 450mm per hour. Slipforming can be performed on either a continuous basis (i.e. 24 hours per day), or a discontinuous basis (i.e. pouring to a predetermined height usually within one working day). As the formwork is raised, reinforcement is held in the correct position using guides fixed to the top of the yokes. Horizontal reinforcement is threaded under the yokes and tied to the vertical reinforcement. Blockouts for doors and windows can be formed with either timber or steel. These are installed as the slipform proceeds and can be stripped from the trailing decks. Similar methods are used for rebates that provide connections between beams, slabs and the slipform walls. When the formed concrete is exposed from the bottom of the steel forms it is treated to meet the specified finish. SRG s experienced engineering and operational personnel ensure the smooth operation of the slipforming process and control of verticality. SRG s technical staff are always available to advise on all aspects of slipforming including coordination of various trades to optimise resources. 5

TAPERED SLIPFORMING Mount Piper Power Station, 275m tall chimney stack tapered slipform construction at the coal powered power station located in Portland, New South Wales. Tapered slipform is required for the construction of conical chimneys, cooling towers, piers and other tall concrete structures involving constant or changing thicknesses in walls, diameters and / or shapes. SRG has been involved in the construction of tapered towers and chimneys from 50m to 275m high, with diameters changing from 25m to 6m, and wall thicknesses changing from 700mm to 250mm. planning require greater attention. The heights can often make the use of cranes impractical. SRG s experience and expertise ensures the success of such projects. While the tapered slipforming process is similar to that used on the standard slipform equipment, the logistics and 6

TYPICAL SECTION THROUGH SLIPFORM SYSTEM FOR TAPERED STRUCTURES Tapered slipform construction of the Telecom communications tower, located on the top of Mount Wellington in Hobart, Tasmania Tapered slipform construction of Collie Power Station, 160m tall. Collie, Western Australia 7

about us We are an Australian complex services company. We solve the challenging and difficult problems that others can t. Our vision is to make the complex simple for our customers. We have people working across Australia and the world bringing our unique blend of innovation, precision, technical excellence and safety to every mining and infrastructure project we touch. Since 1961, we have worked on many of the iconic stadiums, skyscrapers, bridges, dams, structures and mining projects, both here in Australia, and overseas. That s because we re not afraid to challenge what is considered possible. Issue 2016/04 Get to know us at srglimited.com.au australia / AFRICA / MIDDLE EAST / ASIA PACIFIC / HONG KONG CALL 1300 775 477 +61 8 9267 5400 SRGlimited.com.au