Pipes and tubular conduits – With flow regulators and/or baffles – Flow facilitating
Reexamination Certificate
2000-02-18
2001-04-24
Hook, James (Department: 3752)
Pipes and tubular conduits
With flow regulators and/or baffles
Flow facilitating
C138S043000, C138S045000, C138S046000
Reexamination Certificate
active
06220301
ABSTRACT:
The present invention relates to a drainage system for a conduit having a conduit inflow and a conduit outflow.
Such drainage systems are known and customary in a very wide variety of shapes and designs. In particular, measures are often necessary for water conservation which are frequently much too expensive in terms of manufacture. For example, the authorities require retaining basins to protect outfalls, i.e. streams, rivers and lakes.
In addition, there is a need for action when newly built areas are developed if conduits in the old area of a town are overloaded. In particular unsealing and drainage are rarely adequate so that either buffer basins have to be constructed or lengths of conduit have to be replaced in order to protect the older parts of the town.
In addition, conventional drainage systems can usually only be regulated and directed at considerable expense, are expensive to maintain and are therefore associated with extremely high operating costs. In addition, the intention is in particular to improve the environmental protection while reducing the volume of the basins and, in particular, that of the conduits. In addition, there is to be a saving or reduction in investment costs.
The present invention is therefore based on the object of providing a drainage system which overcomes the abovementioned disadvantages and with which a large stream of combined sewage can be slowed down in an easy and cost-effective way, for example when there is heavy rain, the intention being to avoid discharge peaks.
In addition, floods are to be prevented and the operation of sewage treatment plants therefore optimized. In addition, the intention is that it will be possible to use such a drainage system in conventional conduit systems and/or retrofitted into conventional conduit systems while reducing the costs associated with installation, manufacture and maintenance.
The fact that at least one drainage obstacle which can be moved in the direction of flow is provided for limiting, directing, regulating or influencing a stream of water leads to this object being achieved.
In the present invention, a drainage obstacle according to the invention can be introduced into a conventional conduit. Preferably, two drainage obstacles, arranged one opposite the other, are introduced into a conduit. Said obstacles can be moved in an articulated fashion and in the direction of flow, in particular they can be pivoted on conduit walls, in particular secured to an inner wall of the conduit. They are held in a horizontal position with respect to the conduit wall by an energy accumulator element.
A gap is preferably formed between a drainage obstacle and the inner wall or between two adjacent drainage obstacles which are located one opposite the other. Said gap can also be dispensed within a closed position of rest.
A bottom outlet with, if appropriate, a drain which is let into a base in a countersunk fashion may also be provided underneath the drainage obstacle. An overflow may also be provided above an upper edge of the drainage obstacle in the conduit.
In the present invention, water flows into a prechamber of the conduit, and when there are very large quantities of water or mass flow rates, the level in the prechamber, and/or upstream of the drainage obstacle, rises very quickly. As a result, high pressure forces act on the drainage obstacle, which then yield to the pressure forces and correspondingly open a gap which may be formed. In this context, the gap may be enlarged in order to conduct onward the desired quantities of water so that, as far as possible, there is no overflow over the threshold. This system preferably operates in a purely mechanical way and can also be regulated in a purely mechanical way.
This serves essentially to reduce and absorb peak loads. Particularly in the case of rain events, the effect of the drainage obstacles is utilized in a selective fashion to dam up water. This serves as a brake on the drainage. Such drainage systems, in particular drainage obstacles, can be used as systems whose length is divided into sections or which are even in the form of a cascade. They are also suitable, in particular, for installation in previously existing shafts or conduits.
A calculated discharge is conducted onward, for example, to the next mount, via the bottom outlet between the base and at least one drainage obstacle. As rain increases, damming up occurs upstream of the at least one drainage obstacle. The substances contained in the water are precipitated and are conveyed to the sewage treatment part by the bottom current via the drain or via the bottom outlet.
Thus, a coarse separation of the combined sewage from impurities or pollutant loading can also be performed so that the rise in water mass is free of them. As a result, the quantity of water which is relieved by the opening of the drainage obstacle under the effect of pressure has less pollutant loading, which also leads to a reduction in the peaks. Overloaded conduits can therefore convey the quantity of water whose drainage is delayed.
It is not necessary to replace the conduits, and the volumes of new basins can be correspondingly reduced.
This drainage system can be configured by means of conduit network calculation and the dimensions of the drainage obstacles can correspondingly be determined precisely by such calculations.
In particular, optimizing wastewater systems by activating retention spaces in sewage systems and delaying drainage by the use of the drainage system according to the invention enables both existing and also new conduits to be utilized, while drainage peaks are reduced and discharges are slowed down.
In addition, floods can be avoided, while adjoining sewage treatment operations can also be optimized.
The complete conduit network can be operated in purely mechanical terms as a sponge in a very cost-effective way requiring little maintenance. In addition, such a drainage system can be retrofitted into any shaft and is particularly easy to regulate. The frequency of flooding can be minimized and as a result the loading of outfalls can be reduced.
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Bachman & LaPointe P.C.
Guthler Renate
Hook James
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