DE735618C - Lowerable roller weir - Google Patents

Description

Lowerable roller weir It is sometimes desirable for weir systems to bleed the overflowing water stream to a certain point of the weir crown, for example, in order to discharge floats to an increased extent here. Has used for this purpose weeping bodies, their defensive crowns with attachments in certain places ; or incisions are vcrsellpn; these have the effect; that when the Closure body at the deeper points of the weir crown the water first drains. -A disadvantage of this arrangement is that even in the normal Stowage position of the closure body a simultaneous water overflow over the entire width of the weir cannot be achieved because the incisions or essays generally do so impede.

With lowerable roller weirs, in which the closure body is known in the art; he -Unrolls on a support track, the 1 \? achteil described lets through Avoid the arrangement according to the invention. So here is in the normal stowage position an evenly continuous crown height available while lowering the roller his attack is first released at a certain point. Is achieved .this @ according to the invention in that the overflow edge of the weir has several in the Flow light of the water: having partial lengths offset from one another. The overflow edges lying upstream then give rise to the lowering of the roller their rotational movement free the overflow immediately, while the downstream overflow edges Maintain the water level and the water only flows over it when the roller is lowered further will.

It should be mentioned that for the purpose of controllable water drainage below the roll weirs with the roll body Cuts Ö. Like. Has provided. This older request is not, however, useful for overriding the weir to let the water flow away in such a way that the attack initially begins at certain points and here for. Purposes of ice evacuation etc. especially strong. is. Incidentally, the non-plane aspect was also disadvantageous in these older arrangements Location of the defensive sole.

On the basis of the drawing, which shows an embodiment of the invention, should this be explained in more detail, i In Fig. i is a weir roll in cross section indicated schematically and in Fig. a a schematic longitudinal view on a smaller scale Scale reproduced.

Part x of the roller (see ebb .. z) should first allow water to flow off, while parts y and z should only come into effect later. Accordingly, the part x has the cross-section a, b, c, f given in Dep. I, and the parts y and z show the cross-section a, U, d, e, f indicated water level is maintained by the whole roller.

In Fig.3 the same roller is shown in its lowered position. the Overfall edge has retained its height, however the overflow edge b is around that Dimension g lowered. Only when the water is lowered even further is the water over the canted flow.

Fig.q. shows a longitudinal view of the roller according to Fig.3.

The invention can not only apply to weir rollers with an attached dam wall can be applied, as the exemplary embodiment shows, but also at full Roller systems in which the roller body directly forms the retaining wall.

Claims (1)

PATENT CLAIM: Lowerable roller weir with evenly in the stowed position continuous crown height, characterized in that the overflow edge of the weir has several partial lengths offset from one another in the direction of flow, of which the upstream overflow edges caused the overflow when the roller is lowered release immediately; while the raid channels located downstream are the. Water level .still hold and only flow over when the roller is lowered further.