(57) A prefabricated guiding member or casting guide (2,24,32,40,60) for use when casting
concrete floors or similar casted surfaces and adapted to be permanently mounted along
opposite sides of a regtangular casting field (A,B,C,Fig.9) with mutually flushing
top sides (10) previous to the casting operation, the guiding member (24) being shaped
as an elongate casted member with cross section either as an inverted T (2,24,40,60)
or being L-shaped (32), i.e. having a marked foot portion (14) and either an upright
central web portion or an upright web portion at one side of the foot portion (32).
The guiding member (24) being at least at one outside provided with corrugated surface
(26) while the opposite outside preferably has a smoot outside (28) which may even
be almost plane. Hereby it is possible in a better manner to control the formation
of shrink cracks to actually occur preferebly along said smoot outside (28) of the
guiding member (24). By furthermore providing this smoot outside (28) with an upper
joint member (30) it is possible entirely to eliminate the result of unavoidable setting
cracks along the guiding member (24) as the joint member (30) after the casting operation
and setting is substituted by a permanent joint of elastic material. By the casting
of concrete floors the field casted first is mounted with guiding members (24) in
such a manner that corrugated outsides (26) facing all the sides of the field as it
is found that shrink cracks mostly are seen along the last casted side of the guiding
member (24).
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