JP2006016779A - Ventilation structure of underfloor piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation structure of underfloor piping, which can be easily constructed, and which can prevent destruction of seal water by immediately returning negative pressure, generated in the underfloor piping of a centralized batch drainage system, to normal pressure. <P>SOLUTION: In this ventilation structure of the underfloor piping, an underfloor header 2, to which an underfloor drain pipe is connected, and an outdoor home drainage basin 7 are connected together by means of a downstream-side drain pipe 3 passing through a foundation, and an upper part of the drainage header 2 and that of the drainage basin 7 communicate with each other via a vent pipe 5. The ventilation structure like this does not cause the destruction of the seal water, because air is sucked into the drainage header 2 from the drainage basin 7 through the vent pipe 5 so that the negative pressure can be immediately returned to the normal pressure (atmospheric pressure), even in the clogging of the drain pipe 3 and the generation of the negative pressure in an upstream-side drainage pipeline from the drainage header 2. Additionally, the ventilation structure can be more easily constructed than ever before, it eliminates the risk of a deterioration in the appearance of a building. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an aeration structure for an underfloor pipe that can immediately return a negative pressure generated in the underfloor pipe of a centralized collective drainage system to a normal pressure and prevent a sealing water breakage.

  In the underfloor piping of a centralized collective drainage system, when the amount of drainage increases and the water level in the piping rises, negative pressure is generated because the drainage blocks the bent or stepped portions in the piping and blocks ventilation in the piping, This negative pressure has a problem that the drainage of the drain pipe from water facilities such as a wash basin, a kitchen, a bathroom, and a toilet is destroyed.

  Conventionally, in order to alleviate and absorb the pressure fluctuation of such a centralized collective drainage system, a rising pipe is provided in the middle of the drainage pipe from the water facility on the upper floor to the drainage header and extended above the building. This was dealt with by exposing the upper end of the vent pipe to the outside through the end wall of the gable roof.

  However, as described above, the riser pipe extended upward and exposed to the outside can be returned to normal pressure even if negative pressure is generated in the drainage pipe because it is ventilated. Since the rising pipe is exposed to the outside through the wall surface, there is a problem that the construction is troublesome and expensive, and the appearance of the building is damaged. Further, in recent houses, there are cases where the space for installing the riser pipe cannot be secured depending on the position of the water facility.

  In addition, there is a vent valve attached to the upper end of the riser pipe, but since this vent valve uses a rubber plate as a valve body, the valve body becomes sticky due to moisture from the drainage pipe. There was also a problem that it stuck to the seat and did not operate smoothly, or was worried about the sound of the flaps when the valve body opened and closed. In addition, there is also a problem that it is necessary to cover the wall to install this ventilation valve.

On the other hand, in the underfloor piping facility for drainage, there is also known one that can prevent the destruction of the sealed water by connecting the downstream side of the drainage main pipe to an outdoor drainage pipe via a step junction pipe with a bypass pipe. (Patent Document 1). This underfloor piping facility for drainage has a problem that the step joint pipe with a bypass pipe is bulky, cumbersome to assemble, and requires a large buried space, so that the construction is not easy.
JP 2003-147826 A

  The present invention has been made to cope with the above problems, and its purpose is to immediately return the negative pressure generated in the underfloor piping of the centralized collective drainage system to normal pressure and prevent the destruction of the sealing water. An object of the present invention is to provide an underfloor piping ventilation structure that is extremely easy to construct.

  In order to solve the above problems, the underfloor ventilation structure according to the present invention connects an underfloor drainage header to which an underfloor drainage pipe is connected to an outdoor residential drainage basin through a downstream drainage pipe that penetrates the foundation. The upper part of the drainage header and the upper part of the residential drainage basin are communicated with each other through a vent pipe.

  In the underfloor piping ventilation structure of the present invention, it is preferable to connect one end of the ventilation pipe to the inspection port of the drainage header, and in particular, an O-ring seal that enhances airtightness and the ventilation pipe of the inspection port of the drainage header. It is desirable to provide a vent pipe connection port provided with a lock ring for preventing the drop off, and to connect one end of the vent pipe to the vent pipe connection port. Similarly, an O-ring seal that enhances airtightness and a vent pipe connection port with a lock ring that prevents the vent pipe from falling off are provided at the top of the house drainage basin, and the other end of the vent pipe is inserted and connected to this connection port. It is also desirable to do. The vent pipe is preferably a flexible pipe. Furthermore, a plurality of drainage headers may be connected in series, and upper portions of the drainage headers may be communicated with each other through a vent pipe.

  In the underfloor piping ventilation structure of the present invention, the upper portion of the underfloor drainage header to which the underfloor drainage pipe is connected and the upper portion of the residential drainage basin are communicated with the vent pipe. Even if a negative pressure is generated in the drainage pipe upstream from the drainage header, air is sucked into the drainage header through the vent pipe from the residential drainage basin and immediately returned to normal pressure (atmospheric pressure). Therefore, the negative pressure generated in the drainage pipe upstream from the header does not cause the sealing water breakage of the trap of the washstand, kitchen or other drainage device. In addition, since it is only necessary to connect the upper part of the drainage header and the upper part of the house drainage basin with a ventilation pipe, a step with a bypass pipe that requires troublesome assembly and requires a large burial space like the drainage underfloor piping facility of Patent Document The construction is much easier compared to the one with a junction pipe interposed, and the construction is much easier than the conventional one where a rising pipe is provided and its upper end is exposed outdoors. And there is no worry about the appearance of the building being damaged.

  Further, in the above-described ventilation structure, when one end of the ventilation pipe is connected to the inspection port of the drainage header, it is not necessary to provide a new connection port in the drainage header, so that the workability is further improved.

  In particular, the drain header inspection port is provided with an O-ring seal that enhances airtightness and a vent pipe connection port with a lock ring that prevents the vent pipe from falling off, and one end of the vent pipe is plugged into this vent pipe connection port. Then, it is possible to reliably prevent the vent pipe from falling off with the lock ring, and to ensure airtightness with the O-ring seal, thereby facilitating connection work.

  An upper part of the drainage basin is provided with an O-ring seal that enhances airtightness and a vent pipe connection port with a lock ring that prevents the vent pipe from falling off, and the other end of the vent pipe is inserted into this connection port for connection. However, the same effect as described above can be obtained.

  Further, when a flexible ventilation pipe is used, it can be bent freely, so that the workability is further improved.

  On the other hand, if there are many drainage pipes connected to the drainage header and multiple drainage headers are required, connecting multiple drainage headers in series and connecting the upper parts of the drainage headers with vent pipes will prevent pressure fluctuations. Since each drainage header immediately returns to the same normal pressure as the house drainage basin, the sealing water can be prevented from being destroyed.

  1 is an explanatory view of an underfloor piping ventilation structure according to an embodiment of the present invention, FIG. 2 is a perspective view showing a drainage header, FIG. 3 is a sectional view of a vent pipe connection port, and FIG. 4 is a drain header and vent pipe. FIG. 5 is a partially cutaway side view of a residential drainage basin.

  In the underfloor piping ventilation structure shown in FIG. 1, a synthetic resin drainage header 2 is installed on a concrete surface 1 under the floor of a house, and a wash basin, a kitchen, a bathroom, A drain pipe (not shown) from each water facility such as a toilet is connected. A downstream drainage pipe 3 is connected to the downstream side of the drainage header 2, and an upstream drainage pipe 4 (a drainage pipe serving as a main pipe) is connected to the upstream side. The downstream drainage pipe 3 is formed by connecting a plurality of synthetic resin pipes 3a by elbow joints 3b, and penetrates a concrete foundation (cloth foundation) 6 and is installed at the lower part of a house drainage basin 7 buried outdoors. It is connected to the connection port 7b. An inspection port 2a is provided in the upper part of the drainage header 2, and the inspection port 2a on the upper side of the drainage header 2 and the house drainage by a vent pipe 5 that penetrates a concrete foundation (cloth foundation) 6 along the downstream drainage pipe 3. The upper part of the ridge 7 is communicated.

  As shown in FIG. 2, the drainage header 2 is formed by arranging a plurality (two in the illustrated example) of header joints 2b made of synthetic resin such as polyvinyl chloride in a row and watertightly connected. A connecting port 2c for connecting a drain pipe from a wash basin or the like protrudes, and an inspection port 2a is formed at the center of the upper surface. A cap 2d is screwed into the inspection port 2a so as to be freely opened and closed. If the cap 2d is removed, the inside can be inspected and cleaned.

  As shown in FIGS. 3 and 4, a vent pipe connection port 8 is attached to the inspection port 2 a. The vent pipe connection port 8 is provided with a receiving port portion 8a of the vent tube 5 at one end of a 90 ° bent tube portion 8f formed of a synthetic resin such as polyvinyl chloride, and a flange portion 8e at the other end. Is provided. Two ring fitting grooves 8b are provided in the inner peripheral surface of the receiving portion 8a, a circular O-ring seal 8c is fitted in the inner groove, and an obtuse triangular cross-sectional shape is formed in the front groove. A lock ring 8d having a ring shape is fitted so as to protrude an acute inner peripheral edge toward the back of the receiving portion 8a. The O-ring seal 8c plays a role of improving the airtightness when the vent pipe 5 is inserted and connected to the receiving portion 8a, and the lock ring 8d functions to prevent the vent pipe 5 from falling off. Since the lock ring 8d has an obtuse triangular cross-sectional shape, the vent pipe 5 can be easily inserted, but when pulled out, the acute inner periphery is turned back and caught on the vent pipe 5 to generate resistance. Can be securely attached so as not to drop off.

  As shown in FIG. 4, the bent pipe portion 8f of the vent pipe connection port 8 penetrates through the cap 2d of the drainage header 2 and protrudes upward, and the flange portion 8e has the upper end opening edge of the inspection port 2a and the cap 2d. The vent pipe connection port 8 is attached to the drainage header 2.

  Further, the upstream drain pipe 4 connected to the upstream side of the drain header 2 is the same as the synthetic resin pipe of the downstream drain pipe 3 described above.

  The indoor drainage basin 7 is formed of a synthetic resin such as polyvinyl chloride. The upper side wall is provided with a vent pipe connection port 7a, and the lower side is provided with a connection port 7b of the downstream side drainage pipe 3 and a public bottom. A drain pipe connection port leading to the water pipe is provided. This residential drainage basin 7 is always kept at atmospheric pressure.

  The vent pipe connection port 7a of the house drainage basin 7 is also provided with two ring fitting grooves 7d in the receiving port portion 7c of the vent pipe 5, and a circular O-ring seal 8c is fitted on the back side. Since the lock ring 8d is fitted, the vent pipe 5 can be easily and surely inserted and connected so as to be airtight and not fall off.

  The vent pipe 5 for communicating the drainage header 2 and the indoor drainage basin 7 is made of a synthetic resin such as flexible polyethylene or soft polyvinyl chloride, a polyolefin-based elastomer or a synthetic rubber, and has a diameter of 10 to 10 mm. A flexible tube of about 60 mm is preferably used. The vent pipe 5 is not limited to a flexible pipe, but if a flexible pipe is used, it can be bent freely, so that the workability is further improved. Further, the diameter of the vent pipe 5 is not limited to the above range, but if it is smaller than 10 mm, it is too thin and the pressure in the pipe is difficult to return to normal pressure immediately, and conversely if it is thicker than 60 mm, the piping space increases. This is disadvantageous in that the workability deteriorates, and therefore, neither is preferable.

  The vent pipe 5 penetrates a concrete base (cloth foundation) 6 along the downstream drain pipe 3, and both ends of the vent pipe 5 are attached to the inspection port 2a of the drain header 2 and an outdoor pipe. The drainage pipe 2 and the household drainage basin 7 are communicated with each other through the vent pipe connection port 7 a on the upper part of the domestic drainage basin 7.

  The aeration structure of the underfloor pipe having the above-described structure is such that a large amount of drainage concentrates on the drainage header 2 from the washstand or kitchen, closes the downstream drainage pipe 3 and flows from the drainage header 2 to the upstream drainage pipe. Even if negative pressure occurs, air is immediately drawn into the drainage header 2 through the vent pipe 5 from the house drainage basin 7, so the pressure fluctuation in the drainage pipe is immediately relaxed and absorbed to normal pressure (atmospheric pressure). Returned. Accordingly, the negative pressure generated in the drainage pipe upstream from the drainage header 2 does not cause the sealing of the washstand, the trap of the kitchen or other drainage equipment, or the like. In addition, this ventilation structure requires only that the ventilation pipe connection port 8 provided in the upper part of the drainage header 2 and the ventilation pipe connection port 7a provided in the upper part of the domestic drainage basin are communicated with each other by the ventilation pipe 5. It is simple and does not require a large buried space, and there is no worry that the exterior of the building will be damaged.

  FIG. 6 is an explanatory view of an underfloor piping ventilation structure according to another embodiment of the present invention.

  When the number of drain pipes connected to the drain header 2 from a water facility such as a kitchen or a washroom is large, a single drain header 2 does not have enough connection ports 2c, so that it is necessary to install a plurality of drain headers. In this case, as shown in FIG. 6, the two drainage headers 2, 2 are connected in series by the upstream drainage pipe 4, and the vent pipe connection port 8 provided in the inspection port 2 a of one drainage header 2, The vent pipe 50 is connected to the vent pipe connection port 8 of the other drain header 2 so that the drain headers 2 and 2 are communicated with each other through the vent pipe 50. In this way, when negative pressure occurs, air is immediately sucked into the one drainage header 2 through the vent pipe 50 from the house drainage basin 7, and at the same time, air is also sucked into the other drainage header 2 by the vent pipe 50. Since the air is sucked in, the pressure fluctuation in the drainage pipe is immediately relaxed and absorbed, and returned to the normal pressure (atmospheric pressure) to prevent the sealing water from being destroyed. Since the other configuration of this embodiment is the same as that of the first embodiment described above, the same reference numerals are given to the same members in FIG.

  In the ventilation structure of the first and second embodiments described above, the ventilation pipe 5 extends along the downstream drainage pipe 3 and penetrates the foundation 6, but the ventilation pipe 5 does not extend along the downstream drainage pipe 3. You may make it pipe separately. Moreover, in the ventilation structure of Example 2, although both the drainage headers 2 and 2 were connected by the drainage pipe 4, you may connect the drainage headers 2 and 2 directly.

It is explanatory drawing which shows the ventilation structure of underfloor piping which concerns on one Embodiment of this invention. It is a perspective view which shows a waste_water | drain header. It is sectional drawing of a vent pipe connection port. It is an expanded sectional view of the connection part of a drainage header and a vent pipe. It is a partially cutaway side view of a residential drainage basin. It is explanatory drawing of the ventilation structure of underfloor piping which concerns on other embodiment of this invention.

Explanation of symbols

2 Drainage header 2a Inspection port 3 Downstream drainage pipe 5, 50 Vent pipe (flexible pipe)
6 Concrete foundation (cloth foundation)
7 Drainage basin 7a Vent pipe connection port 8 Vent pipe connection port 8c O-ring seal 8d Lock ring

Claims (6)

  The underfloor drainage header to which the underfloor drainage pipe is connected is connected to the outdoor premises drainage basin by the downstream drainage pipe that penetrates the foundation, and the upper part of the above drainage header and the upper part of the premises drainage basin are connected by the ventilation pipe. Ventilation structure for underfloor piping.   The vent structure for an underfloor pipe according to claim 1, wherein one end of the vent pipe is connected to the inspection port of the drainage header.   A vent pipe connection port equipped with an O-ring seal that enhances airtightness and a lock ring that prevents the vent pipe from falling off is provided at the inspection port of the drain header, and one end of the vent pipe is inserted and connected to this vent pipe connection port. The underfloor piping ventilation structure according to claim 2.   A vent pipe connection port equipped with an O-ring seal that enhances air tightness and a lock ring that prevents the vent pipe from falling off is provided at the upper part of the house drainage basin, and the other end of the vent pipe is inserted and connected to this connection port. The underfloor piping ventilation structure according to any one of claims 1 to 3, wherein the underfloor piping has a ventilation structure.   The vent structure for an underfloor pipe according to any one of claims 1 to 4, wherein the vent pipe is a flexible pipe.   2. The underfloor piping vent structure according to claim 1, wherein a plurality of drain headers are connected in series, and upper portions of the drain headers are communicated with each other through a vent pipe.

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