Lift Shaft

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Methodology for Casting of Lift

Core walls


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For the construction of lift core walls ,For the construction of lift core walls ,

a combination of L&T wall formwork systema combination of L&T wall formwork systemwithwith

lift shaft system for supporting internal shutterslift shaft system for supporting internal shutters

andand

Travelling climbing system for External shuttersTravelling climbing system for External shuttersis suggestedis suggested

This gives the advantage of a fasterThis gives the advantage of a faster

progress for lift cores without waiting forprogress for lift cores without waiting for

the floor slab to completethe floor slab to complete


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With the suggested methodology, the lift core walls canWith the suggested methodology, the lift core walls can

progress ahead independent of the slab castingprogress ahead independent of the slab casting


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Typical section of a lift core wall showing inside and outsideTypical section of a lift core wall showing inside and outside

shutters with supporting platform arrangementshutters with supporting platform arrangement


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Formwork details:

L&T Wall formwork with Travelling climbingsystem (CB 150F) used for Outer face of corewall.

L&T Lift shaft platform system used with wallformwork for Inner face / opening.

Outer shutter panels are supported on a pair ofbrackets.

Each pair of shutter panel with brackets havingin-built safety such as necessary handrails forconcreting & shutter platforms.

Tower cranes used for lifting of shutters from one


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The lift shaft platform system is suitable for lift core / RC-walls close to each other.

The Climbing Formwork System comprises of shaft main beam resting in pocketsprovided in the already cast RC-Wall. The cross beams are provided over this.Wooden planks over the cross beams form the lift shaft platform. Leveling of the

platform is possible by operation of spindle within the gravity pawls.

The main beam have gravity pawls which unlocks it self from the pockets when liftedupwards and lock itself at the next pocket location. The gravity pawls are hingedand have one way movement only, the platform thus has high levels of safety.

The platform as a whole alongwith the main beam, gravity pawls, cross beams andplatform can be lifted as one unit.

This platform facilitates resting of the wall formwork and alignment.

Ideal system for speedy

construction.

Eliminates the need for

scaffolding to support the Wall

Formwork. High levels of safety - full proof

system.

Minimum skill & operation for

anchoring & shuttering at each

level.

Liftshaft

platformrestingin thepockets

SALIENT FEATURESSYSTEM DESCRIPTION:

Details showing the arrangement of Lift shaft platform and shutters insideDetails showing the arrangement of Lift shaft platform and shutters inside

Lifting Bkt.

Sling fromCrane

To be cast

Pocket to suitPawl

Freshly cast

Pocket to suitPawl Climbing

Pawl Lift shaftPlatform

Already CastWall

Lifting Bkt.

Sling fromCrane

To be cast

Pocket to suitPawl

Freshly cast

Pocket to suitPawl Climbing

Pawl Lift shaftPlatform

Already CastWall

Sling fromCrane

To be cast

Freshly cast

Climbing Pawl

Lift shaft Platform

Already CastWall

Pocket to suit Pawllift shaftplatformbeing

lifted tothe nextlevel

Sling fromCrane

To be cast

Freshly cast

Climbing Pawl

Lift shaft Platform

Already CastWall

Pocket to suit Pawllift shaftplatformbeing

lifted tothe nextlevel


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Details showing the climbing system 150 F and shutters outside

SHIFTING OF PANELTO NEXT LEVEL USINGCRANE

VERTICAL WALER

ROLL BACKOF SHUTTERS


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L&T Formwork System is being used for the

construction of the LIFT CORE WALLS

Project: TSI Business Park At Hyderabad

Contractor: M/s. Shapoorji Pallonji & CoLtd.

The total catered area is :

2 sets of lift core(typ floor) of phase I=1140 sqm2 sets of lift core(typ floor) of phase II/III=1650 sqm

The total catered area :2790 sqm


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Structure details Total number of lift core = 5 (Two in phase I, Two

in phase-II and One in phase3)

Thickness of wall 230mm (Inner) & 350mm/500mm (Outer)

Total number of vertical floors/ pours is 23 Pouring height per lift 4.00m (max.)

The formwork is designed for:Design lateral concrete Pressure : 41.6 kN/Sq.m

Allowable rate of pour :1.00 m /hour


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Plan of Lift core wall shuttering for phase 1Plan of Lift core wall shuttering for phase 1


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Method statement1. Casting of Starter with timber sides to suit walldimensions.

2. Assembly of formwork: (For 1st Pour)

3.Removal of formwork (for 1st

Pour)

4.Erection of Inside/outside platforms and erectionof formwork for second/next lift and concreting

5. De-shuttering of formwork and transfer to nextlevel along with platforms with the help of crane.

Step 4&5 repeated till the entire structure is


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Method statement ..contdAssembly of formwork: (For 1st Pour)

1. Placing of Shutter panel, check the line and level, then placing along the

one side of the wall.2. Inserting the Tierods upto other side wall surface covered by PVC pipe at

the required locations (ie. As per scheme drawing & design calculations)

3. Placing of other side Shutter panel and check the edges with plumb, thenplacing other shutter panels continuously.

4. Extending the Tie rods and fixing with Anchor plate & wingnut.5. Placing Alignment props / Supporting bracket with Head adapter assembly& Foot adapter assembly.

6. Joining the shutter panels together by Splices with Connecting pins.

7. Fixing of Timber spacers (for wall thickness) on the top between theshutter panels

8. Plumbing of shutters by using alignment struts / plumb bobs.,Checking thestraight line/Checking the wall thickness at the top.

9. Universal inside corners and Universal outside fixing to be fixed accordingto the requirements of wall corners.

10.Stop anchors, Ties ,Anchor cones covered with PVC sleeves to be fixed forsubsequent lift done for climbing system. Place the shaft pocket for shaft


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12 MMDENS PLY

ALIGNMENTSYSTEM

H16 - BEAM

WORKINGPLATFORM

STD. STEELWALER

LIFTINGBRACKET

C /S ELEVATION

WALL FORMWORK SYSTEM

STEEL WALER

12 MM THK PLY.

TIE SYSTEM

H-BEAMS

PLAN


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Method statement ..contd

Removal of formwork:

First removal of Tie rods, Alignment struts, accessories

Removal of shutters (each separately) with the help ofcrane

Cleaning and shifting of shutter panels (with alignmentprops / supporting brackets) to next lift / length.


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Method statement ..contdCB150F-making

1. After dismantling the shutters, remove anchor cone using DKspanner and fix climbing cone.

2. Climbing bracket 150F 2 nos (to suit stop anchor location whichis already left in conc.) should be made as a set by bracing with NB 40pipes and couplers.

3. Fix working platforms with ISMC runners and 2 thick planks.

4. Fix the Vertical waling (roler below the waler should sit over thebracket and scissor action spindle (in collapsed condition) with the helpof Locking pins.

5. Brace the vertical walers properly with horizontal and Diagonal byNB 40 pipes & couplers.

6. Fix the vertical waler with Climbing bracket tightly with wedges toprevent movement.

7. Fix Handraill post on each bracket and hand railing at 2 levels

should be done with NB 40 pipes & couplers.


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Climbing system 150F with outside shuttersClimbing system 150F with outside shutters


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Method statement ..contdCB150F/Lift shaft platforms erection

1 Lift the entire assembly of climbing bracket 150F (by putting thesling on the top of the vertical walers) with the help of crane and placeover the climbing cone correctly. Lock the climbing bracket with thelocking pin to arrest upward movement of bracket from climbing conehead.

2 Follow the procedures described in the assembly of wall formwork,however the alignment props to be removed.

3. Vertical walers should be connected with horizontal walers usingwaling to bracket holders.

4. Top leveling of shutters and adjustment of verticality done byadjusting the screws at the bottom of the vertical walers. Aligning ofshutters should be done with Scissor action spindles.

5. Check the verticality of the shutter using plumb bob.

6. Make lift shaft platform at ground with climbing pawl.

7. Shift the platform with help of crane & place it where the pocketsalread rovided.


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Botom View of shaft platform insideBotom View of shaft platform inside


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Lift shaft platform with inside shuttersLift shaft platform with inside shutters


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Method statement ..contdDismantling and shifting to next level after concreting of typical

pour

Roll back the shutters from concrete face.

Put the crane sling in the hook provided in the Vertical waler.

Take out the locking pin in the climbing bracket, so that the climbing

bracket can be free for lifting. Lift the entire assembly (including shutter panel and climbing bracket

150F assembly) and place it in next position.

Remove Inner shutter panels & shift by crane to available placetemporarily. (low level slab if any)

Lift the Inner shaft platform to next higher level. This entire operation is repeated to complete the core wall

Folded Dowel bars will be taken out by chipping & Bent to requiredposition.

Structural consultants should approve the slab casting & freestandingheight of core walls.


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Lift Shaft

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