4. Presentation on Formwork 2 by Neeraj Jha Delhi

7/21/2019 4. Presentation on Formwork 2 by Neeraj Jha Delhi

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DepartmentofCivilEngineering

IITDelhi

Step 8: Concrete pouring

and compaction

Step 9: Striking of wall

formwork

Construction steps for MIVAN55

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Pitampura TV Tower in New Delhi,

235 m height

constructed

using slipform

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Straight Slipform-Actual photograph57


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Straight Slipform- Schematic view58

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Part Plan of a typical slipform

Part plan for

straight

slipform

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Slipforming for tapered structures60


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Inclined slip form

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Slipform for chimney in progress

Slipform in

progress for

the chimney

A chimney of

275 m height,

30 m base

diameter, and

20.8 m top

diameter was

built by using

slipform

method at

Anpara in U.P.

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Tapered slipform

275 m high

RCC

slipformed

tapered

chimney at 2x 500 MW

Anpara

Thermal

Power Station

in U.P.

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Construction of Pier using slipform

Construction

of Pier(Jammu

Udhampur

Raillink

Project)

Concrete pier

of 80 m

height was

constructed

using slipform

for the Jammu

Udhampur

Railway

bridge

project.

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Slipforming of octagonal shaped RCC bridge piers

Slipforming of

octagonal

shaped RCC

bridge piers

in progress for

the Panvel

River Viaduct

at Ratnagiri

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Flying formwork

The flying form is a system of formwork which is assembled

into form units usually at ground and is located to form

concrete elements at the site location. The form units are

further relocated at new location with virtually no disassembly

of parts to form concrete elements.

The flying forms are more common in high rise buildings for

rapid cycle construction where in large repetitions are possible

and thus justifying their relatively high initial cost of

fabrication.

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Flying formwork

In case of flying formwork all the members are assembled

together to allow lifting of the whole system in one piece which is

in contrast of hand set forms.

A typical flying formwork consists of sheathing member

(mostly plywood), trusses or shores, wooden beams as stringers

and joists.

Joists are timber or aluminium beams connected in most cases

to deep trusses.

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Step-1

Forms are preassembled at ground level

Entire assembly is lifted and placed on existing floor or at

desired level by crane and hoist line.

Flying Formwork Cycle

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Step-2

Form assembly Is then moved and placed into exact

position by movable dollies.



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Step-3

Form assembly is adjusted to correct height and attached

firmly with other modules.

Reinforcement steel is fixed and electrical, mechanical and

plumbing work is done.


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Step-4

Form assembly support systems are lowered to bring the

form down.

This process is done by the hydraulic jacks places under the

formwork.


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Step-5

Then the form assembly is moved to the edge of the

support system by dollies.

Special attention on its movement has to be given.



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Step-6

Form assembly tilts when about half of assembly is out of

the floor slab.

Again the formwork is hoisted to the upper level fot the

next cast.


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Table Forms

Another variant of flying form.

Capable of providing very high speed of

construction.

Used primarily for multi- storey building (such as

residential flats, hotels, hostels, offices and

commercial buildings) construction works with

regular plan layouts and long repetitive structures.

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operation procedure75

Assembling the table form at the ground level

Shifting to the location where the floor is to be cast.

After aligning the formwork, the reinforcement is tied and provisions forother services are laid.

Concrete is poured and allowed to gain strength.

The formwork is struck with the help of jacks and without disassembly oftable form it is rolled towards the faade (exterior) of the building.

From here the table form is picked up by crane for locating it to upperstory.


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Table formwork being flown76

Table

formworkbeing flown to

its new

location

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Table formwork77

Table

formwork

being

positioned

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Transportation arrangement78

Transportation

arrangement

for table

formwork


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Table form in practice79

Extensive use

of Table format Oberoi

Mall Project

Site Mumbai

(Courtesy

L&T)

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Table module being shifted80

Table module

being shifted

to new

location (Note

the props in

folded

position)

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Table module being transported using crane81

Table module

being

transported

using crane

(note thelifting fork)


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Table form being shifted on trolley82

Table form

being shiftedon trolley to

the desired

location

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PERI Table Formwork83

Peri offers modular tables which are pre assembled

for immediate use.

The modules are available in four standard sizes

which allow optimal adjustment to the building. The

sizes are:

Table Module VT 200/215 x 400




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Peri Uniportal Table form84

PERI Uniportal

Table form


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Table swivel head85

Table swivel

head used inprops

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Skytable form -PERI86

Skytable form

(see the

trusses)

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Tunnel form

Fixed bracing.

Need to dismantle into smaller modules before reuse.


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Tunnel form

Wall and ceilings are cast together.

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Tunnel formwork system89

Tunnel

formwork

system

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Construction steps-Tunnel form90

Construction

of starter wall

for the tunnel

formwork

system

Documents

4. Presentation on Formwork 2 by Neeraj Jha Delhi