Patent GB-207863-A (GB)
Title: Improvements in or relating to sluice gates or weirs
IPC: E02B7/20
Filed: 1922-09-05
Abstract: 207,863. Ransomes & Rapier, Ltd., (Walton, E. C. B.). Sept. 5, 1922. Sluice-gates. - In sluicegates of the type described in Specification 190,698 comprising two inclined guide surfaces or flaps extending from the crest of the gate or weir, the inclination of the downstream guide surface or flap is kept constant and independent of the height of the crest. The length of the downstream guide surface is preferably between ¢H and 2H, where H is the maximum depth of water above the crest of the gate when the latter is at its normal working level, and the slope is between 1 in 3¢ and 1 in 5¢. As applied to a sliding gate 2, Fig. 3, of the ordinary type, an upstream flap 10 is hinged to the top of the gate, the other end of the flap sliding on a sill 12. A second flap 13 is fixed or hinged to the top of the gate. In the latter case the inclination of this flap may be maintained constant by guides in the piers or by suitable tackle. In the case of a new gate, the sliding gate 2 may be eliminated, the flaps being hinged to a member which constitutes the crest. The gate may be formed as a float 25, Fig. 6, having a suitably shaped upper surface, and vertically movable in a recess 26 in the channel. In the gate shown in Fig. 7, the downstream flap 13 is hinged to the upstream flap 10 by a hinge 31 forming the crest. The upstream flap 10 is hinged at 32 to the floor of the channel, and the inclination of the downstream flap 13 is maintained constant by means of a parallel linkage formed bv the flaps 10 and 13 and links 33 hinged to the floor of the channel and to the lower end of the flap 13. To prevent eddies and consequent silting under the flap 13, a further flap 35 is hinged at 36 to the outer end of the flap 13, the lower edge of this flap riding on the bed of the channel. The floor of the downstream channel may also be sloped at 42, and ducts 43 leading from the upstream water to an orifice 44 may be provided to flush out the space under the gate. The upper gate member 38 is formed as a counterweight connected by ropes 39 passing over pulleys 40, 41 to the flap 10 near the hinge 31. The gate may be raised and lowered by the ropes 39 or by other mechanism. The hinge at 31 is shown in detail in Fig. 8. The surface plate of the flap 10 is curved at its upper edge 46 to form a circular are, and the surface plate of the flap 13 is extended to abut tangentially at 47 against this arc. The shaft 48 forming the axis of the hinge is supported in the centre of the arc by webs 49, 50. The hinge 36 may be formed in the same manner. In the hinge 32, a plate 51, Fig. 9, fixed to the support abuts against the arc-shaped edge 52 of the surface plate of the flap 10. The upstream flap may be of the radial gate type, consisting of a skin plate 53, Fig. 10, carried on arms pivoted at 54 to the floor of the channel, and moving past a fixed sill 55 so as to make a practically watertight joint therewith. The downstream flap 13 is hinged at 56 to the upstream plate 53, and supported at its lower edge by arms 57 of a length equal to the distance between the pivots 54 and 56, forming a parallel linkage maintaining the flap 13 at a constant inclination in all positions of the gate. An upper gate 59 may also be provided.