Slip formwork technique

Slip formwork Technique
Concrete Technology
Prepared by: Ghanashyam prajapati
(13CV088)

Content
Introduction
Types of Slip Forming
Structure Units Of Slip Forming
Structure Of Slip Forming
Advantages of Slip Forming

Introduction
Slip forming or slip form construction is a
construction method in which concrete is poured
into a continuously moving form.
Slip forming is used for tall structures (such as
bridges, towers, buildings, and dams), as well as
horizontal structures, such as roadways.
Concrete needs to be workable enough to be
placed into the form and consolidated (via
vibration), yet quick-setting enough to emerge
from the form with strength.

Types of Slip forming
1.Vertical Slip forming
In vertical slip forming the concrete form may
be surrounded by a platform on which workers
stand, placing steel reinforcing rods into the
concrete and ensuring a smooth pour.
Together, the concrete form and working
platform are raised by means of hydraulic jacks.
Construction of Silos , Chimneys.

2.Horizontal Slip Forming
In horizontal slip forming for pavement and
traffic separation walls concrete is laid down,
vibrated, worked, and settled in place while the
form itself slowly moves ahead.
This method was initially devised and utilized
in Highway construction.

Structural units of Slip
Formwork
• Slip formwork includes
• steel panels attached to frames,
• working platforms,
• hydraulic jacks,
• rods,
• pumps,
• distribution Centre and
• other connecting elements.

Structure of Slip Formwork
Slip formwork system is a system in which slip
forms are continuously raised by hydraulic
equipment. By this means the rising from 150 to
300 mm per hour depending on the concrete
hardening rate as the cast concrete can become
self-supporting very rapidly.
The system uses steel panels of special height,
which are fixed to working carcass consisting of
steel frames (yokes), trusses and fixing devices.

Carcass provide stability of the system design
and is a reliable base for the wooden flooring
used as a working platform for placement of
concrete, reinforcement and embedded parts for
doors and windows on its surface.
A hydraulic jack is placed on the top of each
frame. A high tensile steel jacking rod is passed
through the jack and is casted into the walls as it
rises. The jack consists of a cylinder and a pair of
upper and lower clamp mechanisms gripping the
rod and working in cycles.

The principle is that the jack works against the
lower clamp to lift the frame. When the pressure
is released upper clamp grips the rod and the
lower clamp is released and come up by spring
action.
Vertical reinforcement is retained in the correct
position using guides, which are fixed on the top
of the frames. Horizontal reinforcement is laid
under the frames and is bounded with the
vertical reinforcement.

Advantage of Slip formwork
 High speed of erection (works’ execution speed
increases) and as a result, rapid completion of
the project - considerable saving of time.
Minimal use of a crane, as formwork is lifted by
hydraulic jacks.
Uniformity of wall sections with the project
drawings, smooth wall surfaces are achieved by
the use of slip formwork.
Reduced labor costs due to the intensity of the
working process.

Slip formwork technique

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