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Climbing formwork is a special type of formwork for large vertical concrete structures.
Climbing formworks will represent an effective solution for structures that require
seamless walls, or their form is very repetitive.
Types of Climbing Forms
There are several types of climbing formwork, depending on the type of building being
built. They can move on their own, using hydraulic or electric jacks, commonly known
as ‘self –climbing formwork’, orthey can be relocated with cranes and other
equipments. There is also a gliding formwork,called Slipform, that is similar to self-
climbing formwork, but it is moving continuously (when pouring is being made) instead of
periodically like the self-climbing formwork, that it is static when pouring is in process.
Crane picked-up jump forms are typically used on buildings of five stories or
more; fully self-climbing jump form systems are generally used on structures with more
than 20 floor levels.
Components of Climbing Forms
Normally, this type of formwork is constructed fromsteel members. Concrete form panels
are attached to this frame; some of them supported on rollers. After the concrete
walls are poured, the formwork is released and moved away from the wall. Then, if self
climbing formwork is being used, jacks lift the frame up to the next level or to the next
area where it will be used. This is normally a relatively fast procedure. Thisvideo will
explain in details the process used in the construction using climbing forms.
Once the climbing formwork is in position, the formwork panels are closed, and the next
concrete wall is poured. The cycle continues, which is normally three to five days.
Faster times have been achieved. However, the limiting factor to faster times is usually
the construction of the floor slabs, which are done as a separate process.
Where to Use Climbing Forms
This type of formwork is recommended in large structures like:
Skyscrapers
Bridge Pylons
Airport Control Towers
High Rise Buildings
Elevator Shafts
Benefits of Using Climbing Formworks
They usually do not require a crane to move them.
Increase construction speed is obtained by allowing the vertical and horizontal
parts of a building to be built concurrently.
It minimizes labor time and has a better productivity rate (these systems are
designed for repetitive use off the critical path).
It does not need additional supports to the formwork (it is supported by the walls just
poured).
Normally, they provide an area for use as a scaffold.
High quality surface finishes can be achieved.
Can sustain high winds(better productivity on windy days).
The formwork system is easy to clean and reuse with little formwork waste generated
compared to traditional formwork.
Other protection systems (Screens) can be hung off a big Jump Form and climbed with
the system.
Long lengths can be obtained combining different section for each particular
project.
Some formwork systems can be used at an inclined angle.
Once the learning curve has passed, performance will be optimized.
The reduced use of scaffolding and temporary work platforms results in less
congestion on site.
Concrete Forms Related Information
Insulated Concrete Forms
Self Climding Forms Uses on Bridges
Cantilever Company-Self Climbing Experts
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Prefabrication
Prefabrication in Hong Kong Kong Public Housing
The Jump Form System
THE JUMP FORM SYSTEM
Fully mechanised public housing construction in Hong Kong in the late 1990's involves the following features:
i. the use of a climbing formwork system (sometimes referred to asself-climbing or self-lifting) to construct the central core walls,
ii. precast facades and steel panel formwork (or alternatively climbing formwork) to construct the residential wings,
iii. aluminium system soffit formwork to construct the floor slabs.
The central core is typically constructed ahead of the residential wings by using a climbing formwork system. The wings then "spiral" around the central core.
The jump form illustrated here is a climbing formwork system developed by Leighton Contractors (Asia) Ltd.
The animation illustrates the process. A frame is constructed from structural steel members over the
