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FORMWORK PRODUCTTECHNICAL GUIDE

Acrow Coreform SystemFormwork Solutions.

Features:

• Produces a fl ush fi nish concrete surface without surface steps

• Quick and easy initial assembly

• Quick and easy to strip and move from pour to pour

• Innovative stripping panels with built-in lifting lugs

• Compatible with Acrowall Panel System

• Self supporting

• Capable of sustaining a concrete pressure of 60 kPa

• Full range of ancillary equipment to provide upper level platforms.

Acrow Coreform System Features

ACROW Coreform System - Description

General Function and Assembly Details

The Acrow Coreform System has been developed to

provide a climbing, self supporting formwork system for

the forming of Lift and Stairwell cores. The system produces

a fl ush fi nish concrete surface with no surface steps

complying with AS 3610 class 3 surface fi nish.

The system is based on the use of Acrowall Panels to form

both faces of each wall. The external formwork is crane

handled in wall face segments after each pour and stored

ready for re-assembly after the slab has been poured.

Alternatively, for lift core construction that proceeds more

than one fl oor in advance of the slab a climbing external

form can be offered.

The internal wall formwork of the core remains in place

until after the slab above it is poured then it is lifted as a

complete segment.

The internal core formwork is constructed using Acrowall

panels and accessories with a Coreform Stripping Panel

Assembly incorporated in the centre of each face.

The formwork is supported via four Adjustable Plumbing

Screws on to two transverse Shear Beams which in turn

are supported by their end Shear Feet fi tting into pockets in

the previously poured section of the core wall. The internal

plan area of the core is decked out by plywood supported

by timber bearers spanning across the Shear Beams.

A platform at the top or at intermediate levels of the form can

be created using Acrowall Platform Brackets, timber planks

with aluminium ladders used for access between levels.

To strip the internal formwork and reposition it for the next

pour the following series of steps should be taken:

• All ties are removed.

• The Climbing Pocket Formers are extracted.

• The Locking Straps securing the three segments of the Coreform Stripping Panel are unlocked. The Stripping Panel then becomes three segments loosely joined by connecting bolts (two tapered Edge Panels with a Centre Lifting Wedge).

• The corner stiffening plates on the Acrowall Corner Panelsare disengaged. This allows a 2o movement of the panel to assist in the stripping process.

• Loosen the 4 bolts connecting the Centre Lifting Wedge to the 2 Tapered Edge Panels, this allows the Centre Lifting Wedge to be lifted upwards after braking its bond with the concrete. When the top locking hole is exposed insert the locking pin into it to hold the Wedge panel in place. The 4 connecting bolts should then be fi nger tightened to reduce excessive play, so that when the Centre Lifting Wedge is fully raised by the crane the action will pull the panels inward.

• The slings of the crane are attached to the lifting lugs at the top of each Centre lifting Wedge. Depending on the plan dimensions of the core, a lifting beam may be required.

• The crane then lifts the form, via the Centre Lifting Wedges, to free the form from the concrete. If necessary a crowbar may be used to break the bond between the concrete and the form face. If a crow bar is used , it must only be placed at the panel joints to prevent damage to the system or the plywood. When the bolts connecting the Centre Lifting Wedge to the Side Panels reach the end of the slots in which they are captive, the Coreform begins lifting clear of the concrete.

• The Shear Beams and their attached platform are linked to the formwork with chains so that as the form lifts, it also lifts the Shear Beams. The Shear Feet attached to the ends of the Shear Beam swivel downwards as they are lifted to the top of the pockets so that they clear the pockets.

• As the form is lifted gravity keeps the Shear feet in constant touch with the wall. When the Shear Feet reach the newly cast pockets at the top of the wall, the Shear Feet fl ip outwards into the Pocket ready to support the Coreform.

• When the form is allowed to sit back onto the Shear Beams it can be aligned by means of the Adjustable Plumbing Screw.

• When the crane is released the Centre Lifting Wedge may need to be assisted to be repositioned back into its original position setting the Coreform to size. Retighten the bolts making the Stripping panels an assembly again. The Striping Panel segment is then locked as an assembly by securing the Locking Straps.

• The Corner Panel stiffening plates should then be relocked to lock the Corner Panel into a right angle.

• The Pocket Formers can then be repositioned.

• After oiling the form surfaces of the internal and external form, fi xing the reinforcement and attaching any blockouts within the wall, the external form can then be placed into position and ties fi tted ready for the next pour.

• Note: As the top of the form maybe acting as the edge form for the slab, the top tie must always be repositioned after the removal of the external form.

• To eliminate possible hazards in the stripping and resetting processit is recommended that the following actions be undertaken:

(a) The mating edges of the three panel that make up the Coreform Stripping Panel Assembly must be cleaned of all grout and must be lubricated prior to their reassembly after the form is lifted and repositioned.

(b) Repair any damage to plywood or make up faces to prevent the damage creating an irregularity in the concrete face which will prevent the easy stripping and movement of the panels away from the concrete face.

(c) Clean and remove all concrete deposits from the form face and apply a form release agent before each pour.

We recommend the use of Acrow Lanolin Release Agent for oiling of the form and the use of Shell Cannery Grease on the Stripping Panel assemblies.

A Recommended Work Method Statement and a Hazard Identifi cation and Risk Assessment for the Coreform system is available from Acrow Formwork & Scaffolding Branch Offi ces.

Product Description Code No. Mass kg (nom.)

Coreform Stripping Panel Assembly

Supplied as a complete assembly featuring a Central Lifting Wedge and two Tapered Edge Panels held together by four Locking Plates and also featuring a captive Locking Pin.

3.9m Stripping Panel Assembly

3.0m Stripping Panel Assembly

CRFSP39

CRFSP30

254.5

195.5

Coreform Shear Beam

Used in conjunction with Shear Foot to provide the support for the Core formwork. No standard sizes stocked Beams are fabricated to suit site dimensions.

Coreform Shear Foot

Inserted into Shear Beam to transfer load to concrete wall structure.

CRFSF 1.8

Coreform Climbing Pocket Former

Used to form the pocket for the Shear Foot.

CRFCPF 1.3

Coreform Levelling Bracket

Used with Levelling Jack to level the form and transfer form mass to Shear Beam.

CRFLB 5.2

Coreform Adjustable Plumbing Screw

Used to transfer form mass to Shear Beam and to level the form.

CRFLJ 6.5

Acrowall components used in the Coreform System

ACROW Coreform System - Components

2700

1520

590

700

590

Tie Positions

120

2700

300 300

120 350 260

350

Acrowall Standard Panels

Heavy duty wallform panel capable of sustaining a concrete pressure of 60 kPa. Available in 8 widths from 300mm to 900mm.

Acrowall Internal Corner Panel

Provides a robust corner junction.

Acrowall Outer Corner Clamp

Used to provide a strong positive right angled corner.

Acrowall Alignment Clamp

Used to maintain alignment of the panels.

Acrowall Centring Tension Bolt

Used to maintain alignment of the panels.

CentralLiftingWedge

Lockinghole forlocking pin

Locking Strap

Locking Pin

Tapered Edge Panels

ACROW Coreform System - Application

Dis

cla

imer 1 Photographs/illustrations shown within this brochure are intended as expressing the diversity and possible applications of the product and as such must not

be used as assembly instructions.

2 In line with Acrow Formwork & Scaffolding Pty Ltd's commitment to continuous product development and improvement, the information contained in this brochure may be changed without notice.

3 Every effort has been made to give appropriate guidelines for the use of this product, however, Acrow Formwork & Scaffolding Pty Ltd accepts no responsibility for any loss or damage suffered by any person acting or refraining from action as a result of this information.

Should the users require any further information or guidance, they are encouraged to contact their local Acrow Formwork & Scaffolding Pty Ltd outlet.

Section through Shear Beam and Shear Footsupporting the Coreform through the Levelling Jacks

Section showing stripped Coreformrelocating into climbing pocket

Section through Coreform Stripping Panel

Plan showing position of Shear Beams

Coreform Stripping Panel Assembly

Central Lifting Wedge joined to side panels by loosefi tting bolts to allow the panel to slide up the Side panel.

Tapered Side Panelbolted to Acrowall Panel

AcrowallPanel

AcrowallPanel

CoreformStripping Panelin fully extendedposition.

See detail below

Timber bearers supported by Shear Beams, decked out with plywood to provide a low level working platform.

Shear Beams

Coreform Stripping Panel Assembliespositioned in the centre of each internal face.

Adjustable Plumbing Screw used as a support and to level the form

Acrowall Panel

Coreform LevellingBracket fi xed toAcrowall Panel

Chain to supportShear Beamswhen form is lifted

Shear Beam andShear Foot assembly

Timber bearerssecured toShear Beam

Lifting Chainattachment cleat

Tapered Side Panelbolted to Acrowall Panel

Formwork

Scaffolding

Industrial & Mining Scaffolding

Phone: 1300 138 362or contact your business development manager.www.acrow.com.au

Contact

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Octob

er 2011