Slip form construction is a method where concrete is poured into a continuously moving form to construct structures without joints. There are two main types - vertical slip forming used for tall structures like buildings and towers, and horizontal slip forming for pavement. The moving formwork is supported by hydraulic jacks and remains intact until the entire structure is completed, allowing faster construction at lower cost compared to traditional formwork. Slip forming produces monolithic, jointless structures but requires careful planning of the construction process and a skilled workforce.

1. SLIP FORM CONSTRUCTION
SUBMITTED BY :
NEERU HOODA
B. ARCH 7TH SEM

2. CONTENTS
Slip form
i. Introduction
ii. Types of slip form
iii. Procedure
iv. Advantage
v. Aplications
vi. Process efficiency
vii. Sustainability features
viii.Precautions
ix. Summary , limitation
x. Refrences

3. INTRODUCTION
• 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.
• 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.
Overview
In the slip form method, paving is done using a
special-purpose slip form paver, without installing
framing.
With this method, concrete structures with
the same cross-section are finished continuously
using a steel mold.
This system is used for ordinary concrete slabs and
continuous reinforced concrete slabs.

4. 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

5. •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 :
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.

6. 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.

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.
•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.

8. ADVANTAGES:
.
•The formwork needs to be continually removed to newer locations and then re-erected.
•Continuous use of manpower and lifting equipment like cranes.
• 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.

9. APPLICATIONS OF SLIP-FORM
CONSTRUCTION
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.
Capital Gate Tower,
Abu Dhabi
King Abdul-Aziz Airport
Inn Canal, Germany

10. PROCESS EFFICIENCY :
 Fast construction can be achieved by
careful planning of the construction
process. Crane availability is critical for
normal jump form.
 Self-climbing formwork cuts down the
requirement for crane time
considerably. By allowing the crane to
be used for other construction work this
may reduce the total number of cranes
needed on site.
 The formwork is independently
supported, so the shear walls and core
walls can be completed ahead of the
rest of the main building structure. This
can help to provide stability to the main
structure during its construction and can
have the beneficial effect of taking the
jump form core off the project critical
path.

11. SUSTAINABILITY FEATURES :
 The formwork system is easy to
clean and reuse with little formwork
waste generated compared to
traditional formwork.
 Climbing formwork systems offer
simplicity, safety and cost
effectiveness for certain high-rise
building structures.
 The repetitive nature of the work,
combined with the engineered nature
of the formwork, allows fine tuning of
the construction operations, which in
turn leads to minimal concrete
wastage.
 Many repeated uses of formwork are
possible before maintenance or
replacement is needed, the number
of uses depending on the quality of
the surface finish of concrete
specified.

12. 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.

13. SUMMARY
• Slip form construction is a construction method in which concrete is poured into a continuously moving
form.
• There are two types of slip-forms; vertical and horizontal.
• Slip-form construction consumes very less time but requires careful planning of construction process to
achieve high production rates.
• Due to continuous concrete pouring in slip-form construction it produces better concrete joint less and
watertight structures.
• Slip form systems require a few but highly skilled workforce.
• Slip-forming is also used in the construction of tapered structures involving changing thicknesses in walls,
diameters and/or shapes.
LIMITATIONS
Not to be constructed large span slab
Need very skillfull labour
Construction cost is very high