GB730389A - Improvements relating to shuttering for concrete and the like - Google Patents

Abstract

730,389. Casting concrete structures in situ. LIND & CO., Ltd., P., and HOLLAND, H. A. May 15, 1953 [May 29, 1952], No. 13719/52. Class 20 (2). Shuttering for concrete walls, more particularly walls of structures such as a cooling tower wherein the perimeter of the wall varies gradually as the height increases, comprises rectangular panels 11 retained in position by vertical members 1 supported solely by a previously built part of the wall 7, a gap between adjacent vertical edges of neighbouring panels 11 being filled by sheet metal strips 2 running the length of the inner faces of the vertical members and overlapping the inner faces of the panels 11, thus enabling the horizontal distance between neighbouring vertical members to vary as required by the shape of the structure. The strips 2 may be bent slightly in plan, Fig. 2, to be tangential to the curvature of the wall at the centre of the panels 11. The shuttering of a lift being concreted, is supported by the shuttering immediately below, which is left in place for this purpose, the vertical members of two such stages of shuttering being joined by a cleat 4 which permits the vertical members to be set at a small angle as seen in side view to enable the wall to curve in vertical profile. The lower edge of a panel 11 of a lift being concreted, is supported by the upper edge of a panel 11 immediately below and is located thereon by an upwardly projecting horizontal cleat 12 which is provided along the upper edge of each panel. The upper edges of the panels 11 of the lift being concreted, are held in place by wedges 14 driven downwards between the cleats 12 and crosspieces 9 secured to the vertical members 1. The shuttering may be used on both sides of the wall with the bolts 8 passing through vertical members 1 on opposite sides of the wall and through precast concrete distance pieces 10. The shuttering may be used on only one face of the wall. As an alternative to providing precast concrete distance pieces 10 the vertical members 1 on both sides of the wall may have cleats or vertical extensions bolted to them and be held apart in any suitable way. An alternative form of panel can be formed of vertical boards held together by the cleat 12 along the top and by a second horizontal cleat a short distance from the bottom. When the diameter of the tower decreases sufficiently, these cleats can be sawn through and a board removed.