Static structures (e.g. – buildings) – Wall – ceiling – or floor designed for utilities – Having a passageway through the entire wall – ceiling – or...
Reexamination Certificate
2000-04-14
2002-07-30
Safavi, Michael (Department: 3635)
Static structures (e.g., buildings)
Wall, ceiling, or floor designed for utilities
Having a passageway through the entire wall, ceiling, or...
C052S302300, C285S125100
Reexamination Certificate
active
06425217
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention principally relates to a new building drainage system.
A conventional building drainage system used for apartment houses, detached houses, etc. generally includes a drainage stack (hereinafter, referred to as “stack”) passing through stories; appliance drainage pipes (hereinafter, referred to as “drainage pipes”) connected to water-service terminal appliances such as a kitchen and a basin provided on each of the stories and extending while being tilted at a slight slope with respect to a floor slab of the story; and a combined joint (hereinafter, referred to as “joint”) for connecting the drainage pipes on each story to the stack, the joint being provided on the same story; wherein waste water from the water-service terminal appliances on each story is discharged in the drainage pipes, being introduced to the joint provided on the same story, and is combined to a fluid flowing in the stack. At the joint of such a conventional drainage system, the drainage pipes cross the stack at an angle of 90° or slightly smaller than 90°, and therefore, the joint is required to have a large capacity, particularly, a large horizontal cross-section. As a result, there arise problems that the joint becomes heavy and expensive, and further becomes poor in the degree of freedom in design because the joint requires a wide space.
In other words, the vertical velocity component of a fluid flowing in each of the drainage pipes is significantly low, and accordingly, at the joint for connecting the drainage pipes to the stack, a cross-sectional occupancy of the fluid in the drainage pipes to a fluid in the stack becomes very large. As a result, a ventilation resistance caused when the fluid flowing in the drainage pipes is combined to the fluid flowing down in the stack becomes significantly large. For this reason, when combined with the fluid flowing down in the stack, the fluid flowing in the drainage pipes interferes with the fluid flowing in the stack, to increase the negative pressure in the stack, thereby causing breakage of sealing of a trap and abnormal noise.
A combined joint configured such that drainage pipes are connected to a stack while being tilted at a specific angle with respect to the stack has been disclosed; however, such a joint is intended to obliquely combine a fluid flowing in each drainage pipe to a fluid flowing in the stack. To be more specific, according to this joint, since the vertical velocity component of the fluid flowing in the drainage pipe is low, there arises the same problem as that described above.
Such a problem is basically due to the fact that the vertical velocity component of a fluid or waste water transversely flowing from appliances on each story is, at the combined joint provided at the same story, largely different from a vertical velocity of a fluid flowing down in the stack passing through the stories, to cause a negative pressure, thereby causing breakage of sealing of a trap and abnormal noise. To solve such a problem, the joint is required to be enlarged, resulting in the raised manufacturing cost. Also if there occurs breakage of sealing of a trap or the like, the sanitary function of the drainage system is lost. To avoid such an inconvenience, the maintenance for the drainage system must be frequently performed, which results in the raised maintenance cost.
A special drainage joint represented by a Solvent drainage system has been known. This joint is intended to make small the cause of generation of a negative pressure by largely expanding the horizontal cross-section of a combined portion and a connecting portion of a stack is offset. Such a joint, however, is large in size and weight, so that the manufacturing cost thereof is increased.
In general, according to the conventional building drainage system, waste water from a water-service terminal appliance is combined to that from another appliance at the same level, and is carried in a drain pipe with a slope in an open-channel manner, that is, in the state in which the drain pipe is not fully filled with the waste water. As a result, the drain pipe is required to be sufficiently thick and to have a standard slope, thereby causing a problem in giving a limitation to the degree of freedom in building plan.
According to the conventional building drainage system, even if there occurs clogging of a drain pipe or leakage of water from a deteriorated drain pipe, such a drain pipe cannot be repaired unless the interior of the building is partially broken, and the replacement of the drain pipe with a new drain pipe requires interruption of the use of the drain system and also requires a large cost. Further, according to the conventional building drainage system, since various kinds of waste water given to an environment by human activity are immediately combined to each other, there occurs a problem in which it is difficult to realize water-saving and make effective use of resources by recycle of heat and organic matters.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a new building drainage system capable of improving the problem of the prior art system, particularly, reducing the so-called ventilation resistance by press-feeding a fluid in each drainage pipe under a siphon phenomenon, thereby allowing the fluid to flow in the drainage pipe in a full-channel manner, that is, in a state in which the drainage pipe is fully filled with the fluid.
To achieve the above object, according to the present invention, there Is provided a building drainage system including: a drainage stack passing through stories in the vertical direction; appliance drainage pipes connected to water-service terminal appliances on each of the stories, each of the appliance drainage pipes including a transversely extending portion and a downwardly extending portion; and a combined joint for connecting the appliance drainage pipes provided on each of the stories to the drainage stack; wherein the combined joint for connecting the appliance drainage pipes provided on each of the stories to the drainage stack is at a level lower than that of a floor slab of the story, to sufficiently give a vertical velocity component to a fluid flowing in each of the appliance drainage pipes, thereby combining the fluid to a fluid flowing in the drainage stack.
Preferably, each of the appliance drain pipes has a transversely extending portion and a downwardly extending portion, and the combined joint is disposed at a level lower than that of the transversely extending portion of the appliance drain pipe by a specific distance. The specific distance may be in a range of 100 cm or more, preferably, 200 cm or more; or may be equivalent to the vertical length of one story of an apartment house or the like.
Preferably, each of the appliance drainage pipes is connected to the combined joint while being tilted at a specific angle with respect to the vertical line. The specific angle may be in a range of less than 45° preferably, less than 30°, more preferably, less than 15°. Most preferably, each of the appliance drainage pipes is vertically connected to the combined joint.
The appliance drainage pipes may be singly connected to the combined joint. Also, the appliance drainage pipes may have the same diameter. Further, each of the appliance drainage pipes may be a flexible resin pipe.
The transversely extending portions of the appliance drainage pipes on each of the stories are placed on the floor slab of the story with no slope. Further, a portion, to be connected to the drainage stack, of each of the appliance drainage pipes may be provided with a counter-flow preventive valve having a flow control function.
According to the building drainage system having the above configuration, various kinds of waste water from water-service terminal appliances are discharged to the independent drainage pipes each having the transversely extending portion and the downwardly extending portion, being increased in vertical velocity component during a period of flowing down in the downwardly exte
Furukawa Satohiro
Tsukagoshi Nobuyuki
Bridgestone Corporation
Safavi Michael
Sughrue & Mion, PLLC
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