FORMWORK

Execution of Works

Fabrication of formwork

Typical form work details to perform the shape, lines, levels, dimensions & quality of concrete surfaces of Beams, Columns, RC Wall & Slab are attached separately in attachments. Permanent brick wall form work will be used for lower ground floor beams, pile caps, sump walls and lift walls where the waterproofing will be done. (Pile caps will not be water proofed) Examples: Pile caps & beams in the sump will be formed with sump base for waterproofing. Ply wood form and brick form, both will be used in the sides of pile caps up to the bottom of ground beams, inner face of ground beams at main entrance & most of the structural elements in other areas in ground floor considering the sequence of water proofing and the sequence of concrete casting. Refer drawings 230M/FW/06 and sheet 1, 2 & 3 in the attachments

Materials for Form Work

GI pipes, form ties, threaded bars and P-cones will be used to tie & brace the form work. In addition to that U jacks, T Jacks, Pipe supports and scaffolding frames with GI pipe bracing are used for supporting the form work.

Timber Panels : 12 mm thick marine plywood frame, with 1” x 2”, 2”x2”, 2’x4”, 4”x4”, 3”x4”

Other Accessories: Steel form tie, steel separators, chain, turn buckle, threaded bars.

Installation of form Panels

Cleaning the construction joint & marking, leveling will be completed before taking formwork panels for fixing.

Conduit, box-out, earthen rods and other embedded items will be fixed on reinforcement or on shuttering prior to align the shuttering on placing the shuttering. Free fabricated panels for columns, walls, slab beams & pile caps will be handled by using Tower Crane/ Mobile Crane or manually.

Markings / Setting out

Pile caps, Columns, walls in ground floor & lower ground floor will be marked on screed concrete as per the construction issued drawing / shop drawing.

For fixing bottom form work of beams, beam bottom levels will be measured from off line to structural floor level marked on column and position of beam will be measured from the grid line marked on columns faces & on floor slab.

TOOLS & MACHINERY

Power tools will be used for cutting and drilling of formwork materials. Work to be done using machinery such as planning, sizing timber and etc will be done in out side and brought to site. Common hand tools will also be used and lifting belts, lifting chains and cables will be used for moving formwork by crane.

MFE formwork tools

SAFETY & QUALITY ASSURANCE

Formwork surface preparation

Release agent will be applied before fixing of form work for columns. Release agents will be applied on slab and beams forms before laying reinforcement and ensure that the release agent does not “puddle” due to excessive application. No part of the reinforcement or construction joints should be coated with the release agent.

Forms shall be thoroughly cleaned and dust, debris, rust or other stains should be removed. Free water and saw dust will also be removed using Air Compressor or manually. The shutter surfaces will be cleaned before re use and maintain the minimum irregularities.

Construction Joint

Construction joint will be formed vertically, horizontally using ply wood, 2”x 2”and 1”x 2” timber. Loose aggregate and cement grout will be chipped off after removing stopped boards. MS water bar will be used at the construction joints in the water retaining walls such as walls in water sump. Key formation at the middle of ground slab along the construction joint will be made for the slab thicknesses more than 300mm.

Removal of Formwork and Supports

Minimum time for formwork stripping without admixtures.

Member Type	Member	Effective Span (m)	Minimum Stripping Time (days)
Vertical & Unloaded	Wall, Column, Beam Side	-	01
Vertical & Loaded	Wall, Column or Load bearing structure	-	03
Horizontal	Slab	< 3 m 3m – 6m >6m	Depend on 7days cube test results (minimum 7days.)
Horizontal	Beams	< 3 m 3m – 6m >6m	Maximum 14days and depend on 7days cube test result. Re-Propping will be done soon after removing F/W additional 7days.