Moulds And Shuttering

Moulds And Shuttering


Moulds And Shuttering:

As concrete is deposited in a semi-liquid or plastic state on the site of the work to be executed, some means must be provided by which it can be formed and maintained in place until the material has finally set or hardened in the required shape.

The means necessary for this purpose vary widely, according to circumstances. For example, if it is
desired merely to form a foundation bed in the ground, the concrete can be filled and rammed into an excavation the bottom and sides of which will suffice to retain the material, and to constitute the most simple form of mould. Again, where concrete has to be spread in the form of a slab upon the ground, or deposited in a mass above ground level, the surface of the earth can be utilized to support the concrete, but timber or metal shuttering, or some form of curb, must be provided along the edges so as to confine the material within required limits. Where the concrete has to be employed in more complex forms, such as columns, arches, beams, girders, trusses, framed structures and complete buildings, bridges, reservoirs or ships, the temporary falseworks or moulds for the reception and support of the concrete, until such time as it has set hard enough to carry its own weight, are of somewhat elaborate character according to the nature of the work to be executed. This point is exemplified by Fig. 16, which shows part of the extensive timber work erected for the construction of
a long range of two-storey dock sheds at Manchester.

Moulds And Shuttering





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