Traditional slipform

Slipform construction is a construction method for tall structures. The technique is similar in nature and application to jump form, but the formwork is raised vertically in a continuous process.

While the formwork grows upwards – concrete is continuously poured into a steel form. Forming, reinforcing and aftertreating are executed concurrently.

As the concrete gradually cures, the slipform creates a seamless concrete structure in one pour from the bottom to the top. In general, the works are carried out in 24 hours shift rotations, but slipforming only during the day is possible, as well.

Our traditional slipform system uses hydraulic jacks or a combination of slipforming and heavy lifting systems where beams, tower cranes or similar are lifted together with the slipform. As most of our fleet is based mainly on traditional slipforming, we can deliver all components and equipment on very short notice.

Reference projectsMore information

Suitable structures:

  • Silos
  • Grain Terminals
  • Water Towers
  • Chimneys
  • LNG Tanks
  • Lining of Shafts
  • High Rise Residential Buildings
  • Control Towers
  • Nuclear Power stations

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 technique

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.

Construction with traditional slipform made by Bygging Uddemann

The advantages of slipform construction

As previously mentioned, the slipform is significantly faster than the traditional ways of building tall concrete constructions. Since the slipform with the working deck constantly moves upwards, the workers always have a stable platform to work from, which significantly increases the safety of the staff. The actual reinforcement of the construction is also facilitated as the iron is easily transported up to the superior speed and cost effectiveness of the method. The molding reinforcement and finishing work occur while the mold is moving upwards. In some cases, cranes do not need to be used at all. In cases when cranes are used, they can follow the sliding form without having to be adjusted as the construction grows taller. The technology does not require any kind of specialist competence. Usually, the work takes place 24 hours a day but can be adapted to the customer’s wishes.

Facilitates complicated constructions

A slipform makes it possible to perform complex concrete constructions such as conically designed bridge abutments with cross-sections and varied thicknesses. We use three different slipforming techniques 𑁋 traditional, conical, and gantry slipform technique. More information about the different types can be found under the respective headings in the menu.
Hire a specialist with the right experience

We are specialized in all types of traditional and conical slipforming, and we have helped further develop the slipform technique for over 70 years. With our solid experience, we know what is required for a successful slipform construction and can tailor slipforming solutions to suit your specific needs. Over the years, we at Bygging-Uddemann have carried out a multitude of both famous and lesser-known slipform constructions with successful results all over the world. Contact Bygging-Uddemann for more information on how to successfully complete your project.

FAQ

What is slip form technique?

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.

How fast can Slipform be constructed?

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.

How much lead time is required to start a slipform project?

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.

How is the slipform equipment shipped and delivered? How long does it take?

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.

How much time it takes to set up a slipform operation?

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.

What happens to the concrete when it rains?

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.

How to inspect slipform equipment?

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.

How much time does it take to dismantle a slipform operation?

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.

Is slipform operation labour intensive?

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.

Where is slipform used?

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.