ARRANGEMENT FOR CASTING IN SECTIONS OF A PRESTRESSED CONCRETE BRIDGE IN ACCORDANCE WITH THE CANTILEVER CONSTRUCTION METHOD

摘要

The arrangement comprises one or several casting carriages (3) with front and back runners (5, 15) which co-operate with traversing rails (2, 2a, 2b) and a previously cast bridge section (1). The rear runners abut the underside of the traversing rails. The rear section (23) of the casting carriage is anchored in traversing trolleys equipped with runners (15). The rear section of the casting carriage is linked with runner trolleys by means of a parallelepiped-shaped frame (28-30) with joints in all four corners so arranged that the frame can be swung out laterally about its two lower joint axes (26, 27) (figs. 1 and 3). In order to stabilise the casting carriage a tensioning device is provided between the rear section (23, 30, 33) of the casting carriage and the previously cast concrete bridge section (1, 18), the said tensioning device being capable of regulation in height and intended for prestressing the tie-rods (38) which are fixed between the bridge deck (18) an a part (30) of the casting carriage's rear section (23) (Fig. 4). For casting in sections of concrete bridges from a bridge pier with superimposed bridge head by way of anchoring section using two casting carriages traversing in opposite directions, which however to begin with are partly dismantled and linked with one another, the arrangement comprises for linking the forward front sections (122) of the casting carriages two substantially plane coupling frames (150) which extend between the front sections (122) their distance from one another corresponding to the gauge of the traversing rails. Each coupling frame has an upper and a lower substantially horizontal flange (151-154) of adjustable length, and the flanges are linked with one another by means of diagonal threaded tie-rods (157, 158) the length of which is also adjustable.