| 摘要 |
<p>Proposed is a formwork (1) which can be used to produce concrete surfaces of different curvature. The mould has a panelling (2) whose curvature can be adjusted, supports (3) which support the panelling, and a brace structure which is applied to the supports (3) a certain distance away from the panelling (2) and which is made up of individual brace elements (4, 5) spanning the gaps between the supports (3). The brace structure is conveniently attached to the sides of the supports (3) remote from the panelling (2). The curvature of the panelling (2) is varied by altering the effective length of the brace elements (4, 5) between the supports (3). The formwork elements facing each other on opposite sides of the mould are braced with respect to each other by means of tie rods (6). A cross-bar (4) is used as the brace element, engaging with a formwork element through at least two supports (3) and acting at the same time as a thrust block for a tie rod (6). Each tie rod is thus fitted between two supports, the forces in the tie rod being transmitted to the supports. The effective length of the cross-bar can also be varied by displacing its point of attachment along the longitudinal axis of the cross-bar and at right angles to the direction in which the supports run. Thus not only can the cross-bar be used as an adjustable brace element to change the curvature of the panelling (2), but it also takes up the tensile forces in the structure.</p> |
