Day-Long Shuttering Activities (Columns, Walls, Footings etc.)
Modelling column shuttering using box, boards, planks or custom forms in Baevr
Generic shuttering is a sequence of three processes: (1) assembly (2) shuttering-in-place during other operations such as bar bending and concrete and (3) dismantling. Baevr addresses the particular case where the duration between assembly and dismantling is shorter than the reporting period of 24 hours, as Day-Long Shuttering. Day long shutters are employed for columns, footings, pile-caps, walls, and marker shoes. The shutters are fixed after the rebar works are completed.
Typical Side Shuttering Methods
Common methods of day-long shutters are as follows:
Custom Board method:
Shuttering Board of custom sizes are used for each side of the shutter and clamped together by a suitable mechanism. Two clamps – one at top and other at bottom are considered as default. If a column size is 300×600, the 300 side may be associated with 12″ board and 600 side with 24″ board. Consequently, 8′ boards may be used for 2.1m column lift, accounting for a wastage of one feet.
Poling Boards or Planks:
In this method, shuttering is assembled at site using planks, runners and wales. The method can be directly operated without additional parameters, unless it is desired to quantify the exact quantity of runners and clamps by using respective input coefficients in take-off.
In this method, a stretcher bond blockwork or half-brick-wall is constructed as the formwork and left in place. Usually, employed for irregular shapes and large sizes of forming, and requires specification of type of block, masonry mortar grade and thickness of blockwork.
Pile caps, footings etc. may require diagonal clamps at the corner. Wall forms may use cross-tie anchors, as additional components.
Column Shuttering Methods
In this method, commercially available box assemblies, including the bolts for clamping are used for column shuttering. For 2.8m lift of column size 300×600, specify 12″x24″x10′ column box for single lift or 12″x24″x7′ column box for two lifts.
Custom-made Pier Forms:
These are made specifically for the project based on the shape and size of the column or pier. As these are made to order, the wastage and clamping detail is already addressed during manufacture. Hence, it is only necessary to specify the area of shuttering.
Column shuttering is integrally accompanied by strutting of the forms. Struts are provided for lateral support of formwork and prevent movement in position and verticality. These struts may be done using steel pipe struts or wooden struts. Steel pipe struts comprise of hollow circular sections that are covered by end-plates at both ends and are identified by diameter (nominal bore) and length. On the other hand, Casuarina struts are measured by weight, and are identified arbitrarily as thick/thin and long/short.
One or two cover blocks are placed, usually at the top, during final fixing of column shutters, to maintain cover for rebar.
Column shuttering may be associated with a permanent or short-duration scaffold, if required for purpose of access or lateral support. Column rebars may (not) be lapped just before shuttering and concreting takes place soon after shuttering.
Wall Shuttering Methods
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