Slip Form Construction technology for the Construction of high rise buildings. it is efficient and less time consuming.

1. SLIP FORM CONSTRUCTION
BY :
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2. 1. Introduction
2. Slip form
INDEX
i. Introduction
ii. Procedure
iii.Types of slip form
iv.Advantage
v. Precautions
vi.Application of
slip form

3. Introduction
• Slip-form Technique is one of the most productive techniques for
construction of High-rise structures like communication towers,
chimneys, bridge piers, silos etc.
• Vertical Slip forming allows concrete to be erected as a monolithic or
a joint-less structure, while reducing overall project duration.
Slipform paving has enabled concrete road pavements, airport
aprons, taxiways, runways, canal lining etc.
• Slip-form Technique has also been successfully applied to various
structures including offshore drilling platforms and nuclear facilities
etc.

4. • Slip form construction, or
continuously formed construction,
is a construction method in which
concrete is poured into a
continuously moving form.
• Basically, this method involves the
continuous placing of concrete in a
shallow mould having the same
plan as the building to be
constructed. This rigid mould, or
"slip-form" as it is called, forms the
working deck which is jacked
slowly upwards at a controlled rate
until the required elevation is
reached.
Introduction

5. •Method of vertically extruding a
reinforced concrete section and is
suitable for construction of core walls
in high-rise structures – lift shafts,
stair shafts, towers.
•The formwork rises continuously, at a
rate of about 300 mm per hour,
supporting itself on the core and not
relying on support or access from
other parts of the building or
permanent works.
SLIP FORM
TECHNOLOGY

6. • Allows for the continuous pouring
of concrete into walls of a
structure and only stops when the
full required height of the
structure has been reached.
• The height of the formwork is
designed in such a way that while
the top of the formwork is being
filled by concrete the lowest layer
of concrete poured earlier has
already gained an initial set. When
the formwork is moved upwards
the concrete that is then exposed
remains firm.
Slip Form
Technology

7. Procedure
• Assembly can only start once the
foundations are in place and the
wall starter is in correct
alignment.
• Slip form shuttering is aligned
with the help of yokes.
• Horizontal crossbeams connect
these yokes.
• Hydraulic jacks are attached to
these crossbeams for
simultaneous upward movement.
• Height of the slip form ranges
from 1.1 to 1.5 meters.

8. • Yokes and crossbeams also used to
support the working platform.
• Structure should be rigid and shape
maintained at all times.
• Make sure there is no lag or else it
prevents the structure from free
upward movement
• It is also possible to reduce wall
thicknesses
• as the construction gains height and
arrangements have to be made in the
slip form structure that will enable
such reduction at regular intervals.
Procedure

10.  It is necessary to use a low slump concrete in slip forming processes where the
formwork is moved horizontally in order for the slab or pavement to retain its
shape as the paving machine advances.
 Presently, slip form pavements use "high early strength" concrete, which
achieves the required strength in approximately 12 hours, as compared to
conventional concrete which requires 5-14 days.
 The water content of this type of concrete is lower than it is for standard
material, resulting in improved strength as well as improved resistance to the
permeation of salt, thereby increasing the finished concrete's resistance to
deterioration from chloride ions.
Structural Concerns

11. 1. VERTICAL SLIP-FORM
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.
Generally, the slip-form rises at a
rate which permits the concrete to
harden by the time it emerges from
the bottom of the form.
TYPES OF SLIP-FORM
CONSTRUCTION

12. 2. HORIZONTAL SLIP-FORM
In horizontal slip forming for
pavement and traffic separation walls,
concrete is cast, vibrated, worked, and
settled in place while the form itself
slowly moves ahead. This method was
initially devised and utilized in
Interstate Highway construction
initiated during the 1950s.

13. • Slip form methods of construction can also be adapted to horizontal structures
and are used for paving, canals, and tunneling.
• The technique is more in use for structures that have continuous walls
like silos , chimneys, and piers for very tall bridges.
• It has also been successfully used for construction of buildings, although this
requires the manner of leaving inserts for openings like doors and windows to
be decided well in advance, as well as also any necessary inserts to support
floor slabs after the walls are constructed.
HORIZONTAL SLIP FORM

14. 3. TAPERED SLIP-FORMING
• Slip-forming is also used in the
construction of conical chimneys,
cooling towers, piers and other tall
concrete structures involving constant
or changing thicknesses in walls,
diameters and/or shapes.
• A form is used with sections which
overlap so that one gradually slides over
the other. This is commonly done in
chimney construction but it is not
satisfactory for architectural concrete
because the lap shows.
• While the tapered slip-forming process
is similar to that used on the standard
slip-forming, it requires greater
attention, contractor experience and
expertise ensures the success of such
projects.

15. ADVANTAGES
•A major cost of concrete structure
construction is the required formwork
to retain the concrete till it can be
safely de-shuttered and be able to
support itself and other imposed
loads.
•The formwork needs to be
continually removed to newer
locations and then re-erected.
•Continuous use of manpower and
lifting equipment like cranes.

16. • In the case of slip form building, the
formwork is erected only once and
remains intact until the entire
structure is completed.
• Great reduction in the cost of
formwork as well as time saving for
re-erection.
• Cost effective
• The reduction in the movement of
formwork and workers also leads
to far more safe working conditions
that also make it a major advantage.
Advantages

17. PRECAUTIONS
• Concrete is continuously protected against
loss of moisture and rapid temperature
changes for 7 days
• Unhardened concrete is protected from rain
and flowing water
• Prevent plastic shrinkage
• Plastic cracks are filled by injection of epoxy
resin.

18. APPLICATIONS
Slip-form construction is used for tall structures, such as towers, buildings,
and dams, as well as horizontal structures, such as roadway barriers. It
enables continuous, non-interrupted, cast-in-place joint-less concrete
structures which have superior performance characteristics over construction
methods using discrete form elements. Slip forming relies on the quick setting
properties of concrete, and requires a balance between quick-setting capacity
and workability.
King Abdul-Aziz Airport, Jeddah, Saudi
Arabia

19. Capital Gate Tower, Abu Dhabi, UAE

20. Thank You