Why use slipform?
Slipform construction is undoubtedly the fastest and most economical way to build high-rise concrete structures. The slipform method builds structures at an average speed of 4 to 8 m per day (5-7 times faster than conventional industry). Slipform is a very safe construction method because it does not require continuous dismantling and reassembly of the formwork using heavy equipment such as cranes during the construction of concrete structures. The formwork only needs to be completely assembled on the ground once before pouring concrete.
Operating principle of slipform
Bygging-Uddemann first invented the hydraulically operated slipform technique in 1943 which we’re still developing and improving based on the same principle to this day. The hydraulic jack allows the entire formwork to continuously ascend for 24 hours at a rate of 25 to 30 mm at a time along the steel rod embedded in the concrete structure where curing is taking place.
Bygging-Uddemann also offers custom slipform methods that meet fast, safe and economical demands based on myriad experiences applying slipform methods to various concrete structures (silos, chimneys and other high-rise towers). For example, the slip-form method is applied to the conical tower in the wind power field.
Bygging-Uddemann’s reputation comes from slip foam and is an expert in all types of general slip foam, factory slip foam and conical slip foam.
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FAQ:
The slipform technique is based on hydraulic slipform jacks. The slipform jack is continuously lifting a complete formwork with work decks and workers, 25-30mm at the time, 24 hours a day – climbing on embedded steel tubes inside the curing concrete. As the concrete gradually cures, the slipform creates a seamless concrete structure in one pour from the bottom to the top.
The slipform technique offers a construction rate of 4m-8m per 24h. It’s undoubtedly the fastest and most economical construction method available for high-rise concrete structures – about 5-7 times faster compared with conventional methods.
It depends on several factors. Where the project is located, how complex it is and if we need to manufacture new parts, or if they are already in stock. As a rough approximation, assume 5 to 10 weeks for the design and preparation of slipform equipment from our workshop. Shipping within Sweden is estimated at one week, to Europe 2-3 weeks, to the USA and the Middle East 5 weeks, and to Africa and East Asia takes about 7 weeks. The supplier normally commits to a delivery schedule for its commitment.
We usually deliver our equipment in standard containers (20ft or 40ft). When equipment is to be sent between different parts of the world, it is done by boat. Transport from port to location and back to port is normally handled by the customer. Delivery terms can be made by agreement between the parties.
It depends a lot on the size and complexity of the project – from a few days to several weeks. The customer can undertake to assemble the equipment, or if it is agreed, it is done under the guidance of our supervisors.
The slipform process is not disturbed by rain. Excess water is not actively mixed into the concrete. In wet climates and particularly exposed areas, the slipform rig can be covered by a lightweight roof construction supported by the slipform yoke.
Inspection and maintenance during slipforming takes place regularly. Cleaning of formpanels, checking the function of pumps, hoses and jacks. This is done by our supervisors if we have one on site.
In addition to this, the slipform result also needs to be checked. This is usually done using a laser measuring equipment. Please note that control and measurement of the slipform results is always the customer’s responsibility. The construction process can be facilitated by giving the slipform operator access to the measurement results. Then easy adjustments can be made to optimize the result.
Depending on the size of the project, the dismantling takes from a few days to a few weeks. You can calculate that a disassembly takes about half as long as the first assembly. We will provide guidance on how to proceed and if we have a supervisor on site, he or she, will lead the work.
This depends a lot on the size of the project. Each project requires at least one main supervisor and enough concrete workers, carpenters, and welders to keep up with production (so that the sliding speed will remain constant). We usually send an expert to supervise the assembly and the slipform process, while the main contractor delivers the work staff.
Slipform is undoubtedly the fastest and most economical construction method available for high-rise concrete structures. The technique offers a construction rate of 4m-8m per 24h (about 5-7 times faster compared with conventional methods).
Suitable structures are for example: Silos, Bridge Piers, Grain Terminals, Caissons, Water Towers, Chimneys, LNG Tanks, Lining of Shafts, High Rise Residential Buildings, Control Towers etc.
슬립폼을 사용하는 이유?
슬립폼 공법은 의심할 여지 없이 고층 콘크리트 구조물을 건설하는 가장 빠르고 경제적인 방법입니다. 슬립폼 공법은 일일 평균 4m~8m 의 속도로 구조물을 건설 합니다(재래식 공업에 비해 5~7배 빠른 속도입니다). 슬립폼은 콘크리트 구조물의 건설 중에는 크레인등의 중장비를 이용한 지속적인 거푸집의 해체 및 재 조립이 불필요 하므로 매우 안전한 건설 공법 입니다. 거푸집은 콘크리트 타설 작업 전 지상에서 완전하게 한번 만 조립 하면 됩니다.
슬립폼 동작 원리
비깅우데만은 1943년 유압으로 작동하는 슬립폼 공법을 최초 발명 하였으며 현재에도 동일한 원리를 기반으로 지속적으로 발전 시키고 있습니다. 유압잭은 전체 거푸집을 양생이 이루어 지고 있는 콘크리트 구조물에 매립되는 스틸로드를 따라 한번에 25~30mm 씩 24시간 지속적으로 상승 동작하도록 하여 점진적으로 양생이 이루어 지는 콘크리트 구조물을 바닥에서 상부까지 하나의 이음매 없는 구조물로 제작 합니다.
Standard slipform set-up
Slipform for tapered & conical structures
Slipform for mass production
Specialized slipform solutions