JP2004353444A - Drainpipe bend and drain piping system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainpipe bend that prevents any increase in positive pressures within drainpipes caused by blockage at the bend, is not restricted in its application direction or application positions, and is simple in structure. <P>SOLUTION: In a drainpipe bend of which the pipe body 2 is curved relative to the pipe axis, and in which a pipe end 3 is formed at both ends of the pipe body 2, an air vent space 4 larger in internal diameter than other parts is formed at the bending part of pipe body 2 in the direction of the pipe axis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drain pipe bend and a drain pipe system.

As shown in FIG. 30, in a drainage pipe system adopted in a multi-story building such as an apartment house, an offset portion 101 may be provided at a lower end portion of a vertical main pipe 100 that is piped vertically through each floor. In this offset portion 101, a horizontal portion 104 is connected to a hanging portion 105 by using a bend 102.
However, in the piping using only the bend 102, the inside of the bend 102 is blocked by the drainage flow (see FIG. 7 used in the description of the bend 1 of the present invention described later), and the air loses the escape space. An abnormal positive pressure was generated as a cause, and a backflow sometimes occurred in the drainage device 106 connected to the standing main pipe 100 at a relatively low floor.

Therefore, the offset portion 101 is provided with an air vent pipe 107 that bypasses the horizontal portion 104 and the hanging portion 105. However, this makes the piping work troublesome, and there are cases where the space cannot be adopted due to space. For this reason, a contrivance has been made to provide a swirl vane for drainage flow (for example, see Patent Document 1 and the like) and a ventilation path having a double pipe structure (for example, see Patent Document 2 and the like) as the bend 102. .
JP-A-8-105088 JP-A-8-68085

In the conventional various bends provided with the swirl vanes for the drain flow as described above and the ventilation path of the double pipe structure, the direction in which the drain flow hits the swirl vanes for the drain flow, and the air introduction port in the ventilation path, respectively. It has to be directed upstream in the direction of drainage, so that its use is limited.
In addition, these conventional bends can be used only as a portion connecting the horizontal portion 104 and the hanging portion 105 as the offset portion 101. That is, for example, it cannot be used in a portion where horizontal portions are connected in a horizontal hook shape in the left-right direction.

However, even in a bend used in a portion where such horizontal portions are connected to each other in a plane hook shape in the left-right direction, the drainage flow becomes a swirling flow along the inner circumferential surface of the pipe due to the inertia of the curve due to the curve inertia. Blockage may occur. Therefore, conventionally, as a countermeasure in this case, the air vent pipe 107 must be provided.
The present invention has been made in view of the above circumstances, and it is intended to prevent the occurrence of positive pressure due to blockage in a pipe in a bend, and further, the use direction is not limited, and the use place is not limited. It is an object of the present invention to provide a drain pipe bend and a drain pipe system having a simple structure without limitation.

In order to achieve the above object, the present invention has taken the following measures.
That is, the drainage pipe bend according to the present invention has a pipe with a bent pipe axis, and pipe ends for connecting pipe members are provided on both sides of the pipe. In the bent portion of the pipe body, a ventilation space having an expanded pipe inner diameter is formed along the pipe axis direction.
The ventilation space is preferably formed by expanding the inside diameter of the tube toward one side along the bending direction of the bent portion, but is not limited to this, and is not limited to the inside or outside of the curve. It may swell.

With such a configuration, since air can be circulated through the ventilation space, no blockage in the pipe due to the drainage flow occurs, and therefore, no abnormal positive pressure is generated, so that the backflow of the drainage flow is prevented. Will be. In this case, if the ventilation space is formed so as to expand the inner diameter of the tube, and if the ventilation space is provided on the side of the tube, the direction of use or use as the bend, The location is not limited.
In addition, the said ventilation space can also be made to be provided toward the opposite both sides with respect to the bending part of a pipe. By doing so, the use direction in the left-right direction is not limited.

Further, the drain pipe bend according to the present invention may be one in which the inner diameter of the pipe at the bent portion of the pipe is larger than the nominal diameter of the pipe end. A ventilation space can be formed in the body.
In this case, the diameter expansion of the pipe body may be coaxial with the pipe axis connecting the pipe ends on both sides, or the difference in inner diameter caused by the diameter expansion may be made in any of the radial directions. You may make it eccentric.
In the case where eccentricity is also involved in expanding the diameter, the position of the ventilation space can be determined from the outer shape. In addition, since the difference in inner diameter caused by the diameter increase can be effectively used as the ventilation space, it is possible to secure a wider ventilation space as compared with the case where only the coaxial diameter is increased.

It is preferable that the eccentric direction of the tube is directed to one side (lateral direction) along the bending direction of the tube.
When only the diameter is increased without eccentricity, the tubular body does not have a structurally remarkable appearance, so that there is an advantage that the production becomes easy and that the use state does not give a sense of incongruity.
It is preferable that the pipe is formed by connecting a joint pipe forming a pipe end on both sides and a bent pipe forming a bent portion.

In this case, the joint pipe is preferably inserted into both ends of the bent pipe section. And it is preferable that the axis of the pipe end formed by the joint pipe and the axis of the bent pipe be eccentric.
That is, the joint pipe has one end connected to the end of the bent pipe part and the other end connected to another pipe member, the nominal diameters of both ends are different, and the axial centers of both ends are different. Are eccentric to each other.
On the other hand, if only the diameter is increased without eccentricity, the two may be connected coaxially so that the different diameter pipe is sandwiched between the joint pipe and the bent pipe portion. Therefore, for example, by connecting a conventional bend and a short straight pipe having a small nominal diameter with an increaser or the like, it is possible to configure the bend of the present invention in which only the diameter is increased.

Such a pipe body of the drain pipe bend according to the present invention may have a bending direction connected from the horizontal portion to the hanging portion, or a bending direction connected from the horizontal portion to the left and right horizontal portions. And can be used freely. That is, it is not limited in terms of use.
On the other hand, in the drainage pipe system according to the present invention, a horizontal main pipe is connected to a lower portion of a vertical main pipe, and an offset portion having a downward bent portion is formed on the horizontal main pipe. The drain pipe bend was used.

  A horizontal main pipe is connected to a lower part of the vertical main pipe, and a horizontal bent part having a hook shape in a plan view having a primary bend part and a secondary bend part is formed on the horizontal main pipe. The drainage pipe bend of the present invention is used as a secondary bend.

  ADVANTAGE OF THE INVENTION The bend for drainage piping which concerns on this invention prevents generation | occurrence | production of the positive pressure resulting from blockage in a pipe in a bend. In addition, the structure is simpler without limiting the direction of use and the place of use.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of a drain pipe bend 1 according to the present invention.
The drain pipe bend 1 has a pipe 2 with a bent pipe axis. On both sides of the pipe 2, pipe ends 3 for connecting other pipe members are formed. In the present embodiment, a 90 ° bend that turns the two pipe ends 3 to each other at 90 ° is provided, and the two pipe ends 3 have a certain degree of straight pipe portion 2a to enable insertion at the time of piping. The one formed as the one secured by the length is shown. The tube 2 may be made of resin or metal.

  The pipe 2 has a ventilation space 4 at a middle part in the pipe axis direction in which the inner diameter of the pipe is partially expanded. The ventilation space 4 is provided corresponding to the bent portion of the pipe body 2, and does not extend to the straight pipe portion 2 a near the pipe ends 3. The ventilation space 4 is provided so as to bulge toward one side of the tube 2 in the bending direction. The "side" at this time is assumed to be a point at which the curve of the pipe axis of the pipe body 2 moves in a mountainous manner. To say

The area in which the ventilation space 4 is formed (the length of the tube 2 along the pipe axis direction), the opening area toward the inside of the tube 2 (the opening width along the inner circumferential direction of the tube 2), and the capacity of the ventilation space 4 The (depth swelling radially outward from the inner surface of the tube 2) may be appropriately set according to the inner diameter of the tube 2, the degree of bending of the tube shaft, and the like. In short, it is only necessary that the ventilation space 4 be opened within a range in which the inside of the pipe 2 can be blocked due to the drainage flow (see FIG. 7).
The drain pipe bend 1 having such a configuration is, for example, as shown in FIG. 5, in the case of a drain pipe system in which an offset portion 101 is provided at the lower end of a vertical main pipe 100, the horizontal portion 104 of the offset portion 101 Used to connect the depending portion 105.

When drainage flows from the main pipe 100 side through the horizontal portion 104 in such a pipe state, the drainage flow flowing into the drainage pipe bend 1 from the horizontal portion 104 is overpowered as shown in FIG. Even if it is likely to cause blockage in the pipe due to collision with the front wall surface of 2, since the ventilation space 4 is open on the side, air can be passed through this ventilation space 4. Distribution becomes possible.
Therefore, the blockage in the pipe due to the drainage flow does not occur, so that the blockage in the pipe does not cause an abnormal positive pressure to be generated upstream of the drain pipe bend 1. Therefore, in a multi-story building or the like in which this drainage pipe system is adopted, backflow is prevented by drainage equipment (see reference numeral 106 in FIG. 30) connected to the main pipe 100 at a relatively low floor.

  In addition, since the drainage pipe bend 1 is provided with the ventilation space 4 on the side of the pipe 2, its use direction is not limited to a location connecting the horizontal portion 104 to the hanging portion 105. Absent. For example, as shown in FIG. 6, the drain pipe bend 1 may be used to connect the horizontal portion 104 to the horizontal portion 110 facing rightward, or the drainage pipe bend 1 may be further connected to the left side ("front" in FIG. 6). This drain pipe bend 1 can be used for connection to the horizontal portion 111 in the direction described as "). In these places of use, it is preferable that the ventilation space 4 is piped so as to be above the pipe 2.

In the case of such a drainage pipe system, the drainage flow becomes a swirling flow along the inner peripheral surface of the pipe body 2 due to the inertia of the curve, so that even if an attempt is made to cause blockage in the pipe, this blockage in the pipe can be prevented. In addition, even if the horizontal portions 104, 110 and the like are instantaneously or temporarily filled with water, the air is allowed to flow through the ventilation space 4 and positive pressure is reliably prevented from being generated. Will be.
FIG. 8 shows a second embodiment of the drain pipe bend 1 according to the present invention.
The drain pipe bend 1 of the second embodiment is different from that of the first embodiment in that a ventilation space is provided in the pipe 2 toward opposite sides of the bent portion. In this way, even if, for example, differences are provided in the pipe ends 3 of the pipe body 2 with respect to the hole diameter, the joint shape, the length of the straight pipe portion 2a, etc., the drainage pipe bend is used. The use direction in the left-right direction as 1 is not limited at all. Therefore, there can be obtained an advantage that cost and handling problems do not occur at all in terms of use and manufacturing.

Other configurations, structures, operational effects, and the like are substantially the same as those in the first embodiment, and thus detailed description thereof will be omitted.
9 to 11 show a third embodiment of the drain pipe bend 1 according to the present invention.
The drainage pipe bend 1 of the third embodiment increases the inner diameter d1 of the pipe at the bent portion of the pipe 2 from the nominal diameter d0 of the pipe end 3, and further calculates the difference between the inner diameters caused by the expansion. It is eccentric (the eccentric part is indicated by an arrow X in FIGS. 10 and 11). Here, the nominal diameter of the pipe end 3 refers to an inner diameter substantially used for water flow in the pipe end 3, and for example, a pipe 15 connected to the pipe port 3. Is equivalent to the inner diameter of the tube 15. In the case where a pipe (not shown) on the connection side is externally fitted to the pipe end 3, it corresponds to the inner diameter of the pipe end 3.

Since the pipe 2 is expanded in diameter and eccentric as described above, when the drainage is allowed to flow through the pipe 2, the drainage tends to flow with inertia and the ventilation space 4 is provided on the eccentric side. (Shown by hatching in FIGS. 10 and 11). Therefore, the flow of air is allowed and secured through the ventilation space 4, and the generation of positive pressure is reliably prevented. Therefore, no blockage in the pipe due to the drainage flow occurs, and therefore, no abnormal positive pressure is generated on the upstream side of the drain pipe bend 1 due to the blockage in the pipe.
In order to form an eccentric portion (arrow X) in the tube 2, in the third embodiment, the tube ends 3 provided on both sides of the tube 2 are replaced with a bent tube portion which is a main portion in the tube 2. The joint pipe 10 is formed as a member separate from 2A, and the joint pipe 10 itself is eccentric. That is, the bent pipe portion 2A of the pipe body 2 is not eccentric.

In this case, the joint pipe 10 is inserted so as to fit inside both ends of the bent pipe portion 2A. The axis of the pipe end 3 formed by the joint pipe 10 is eccentric with the axis of the bent pipe 2A.
That is, the joint pipe 10 has one end inserted into the end of the bent pipe portion 2A and the other end into which another pipe member is inserted, the nominal diameters of both ends are different, and the shafts of both ends are different. The hearts are eccentric to each other.
With such a structure, the bent tube portion 2A of the tube body 2 is easily manufactured. In addition, by changing the attachment angle of the joint pipe 10 with respect to the bent pipe portion 2A, the eccentric state as the bend 1 can be arbitrarily changed, and as a result, the formation position of the ventilation space 4 with respect to the inner peripheral surface of the pipe body 2 can be changed. It can be set appropriately. As a result, fine adjustment according to the position where the bend 1 is used, drainage conditions, and the like can be performed. In addition, if a straight pipe that is not eccentric is connected to the bent pipe portion 2A instead of the joint pipe 10, there is an advantage that it can be formed and used as a normal bend.

FIG. 12 shows a drain pipe system 20 according to the present invention constructed using the bend 1 of the third embodiment described above. In the drainage pipe system 20, a horizontal main pipe 120 is connected to a lower portion of the vertical main pipe 100, and an offset portion 122 having a downward bent portion 121 is formed on the horizontal main pipe 120. The bend 1 is used as the part 121.
FIG. 13 shows another example of the drain pipe system 20 according to the present invention constructed using the bend 1 of the third embodiment. In the drainage pipe system 20, a horizontal main pipe 120 is connected to a lower part of the vertical main pipe 100, and the horizontal main pipe 120 is formed into a hook-like horizontal bending having a primary bending portion 125 and a secondary bending portion 126 to the left and right. A part 127 is formed, of which the bend 1 is used as the secondary bending part 126.

14 to 18 show a fourth embodiment of the drain pipe bend 1 according to the present invention.
The drain pipe bend 1 of the fourth embodiment is substantially the same as the bend 1 of the above-described third embodiment (see FIGS. 9 to 11), and is an example in which details are embodied as actual products. It is. As is clear from these drawings, in the joint pipe 10 formed separately from the bent pipe section 2A, a deformed section bulging in the outer circumferential direction which is deviated in order to cause eccentricity at a portion connected to the bent pipe section 2A. 16 is formed, the thickness of the deformed portion 16 is reduced as much as possible to increase the material cost, suppress the weight increase, and prevent the occurrence of molding distortion.

19 to 23 show a fifth embodiment of the drain pipe bend 1 according to the present invention.
The drainage pipe bend 1 of the fifth embodiment is obtained by coating the bend 1 of the fourth embodiment (see FIGS. 9 to 11) with an outer layer 17 for fire resistance.
The refractory material used for the outer layer 17 is cement mortar, fiber mortar, or the like. Fiber mortar is a mixture of aggregate, silica sand, calcium carbonate, barlite, glass wool, rock wool, organic wool, and the like mixed with cement. As an example of the composition, 52% of Portland cement, 25% of aggregate, 20% of inorganic fibers, 3% of organic fibers, and other appropriate materials such as ceramics and cements are mixed.

  FIG. 24 is a table summarizing experimental methods and results of examining the effect of the expanding direction of the bend (tube) on the pressure inside the offset piping. As is apparent from FIG. 24, although there are some differences depending on the direction of the eccentricity, there is a large difference in the maximum pressure generated between the expanded bend and the bend that does not expand (in short, the conventional bend). Is recognized. Needless to say, the expanded bend has succeeded in suppressing the pipe pressure. Among the expanded bends, there is a bend in which the pipe body 2 is not coaxial with the pipe axis connecting the pipe ends 3 on both sides but is only coaxial with the pipe axis (see “ Core diameter) is also included.

For this reason, the bend 1 according to the present invention is such that the pipe body 2 is not coaxial with the pipe axis connecting the pipe ends 3 on both sides, but is only coaxial with the pipe body and is only expanded in diameter. Shall be included.
FIGS. 25 to 28 show the case where the bend 1 of the present invention is adopted for each pipe when the offset is taken for 1 to 3 layers and when the offset is a small offset less than 1 layer. It summarizes the test facilities and the results of examining the effects on the water. As the bend 1 of the present invention, the one described in the fourth embodiment (FIGS. 9 to 11) was used.

As is clear from these figures, it is confirmed that the bend 1 of the present invention is superior to the conventional bend as the effect of suppressing the maximum pressure and the minimum pressure when the offset is set to any height. I have.
26 and 27, in addition to the test equipment using the conventional bend and the test equipment using the bend 1 of the present invention, a vent valve is further provided while using the bend 1 of the present invention. The test equipment was set up, and the results obtained by this test equipment are also shown. The vent valve is provided on the condition that it is provided between the connection between the standing main pipe (the lower end thereof) and the bend 1 of the present invention before the offset.

When the results are compared between the case where the vent valve is not used and the case where the vent valve is used among the test facilities using the present invention bend 1, it is recognized that the use of the vent valve enhances the effect of suppressing the minimum pressure. From these facts, it can be found that when the offset level is high, it is preferable to use the vent valve together with the use of the bend 1 of the present invention.
FIG. 29 summarizes test facilities and results obtained by examining the effect of the bend 1 of the present invention on the pressure in the pipe when the horizontal main pipe is continuously and horizontally bent.
As is apparent from FIG. 29, it has been confirmed that the bend 1 of the present invention is more excellent in the effect of suppressing the maximum pressure than the conventional bend even in the portion where the horizontal main pipe is bent horizontally.

By the way, the present invention is not limited to the above-described embodiments, and can be appropriately changed according to the embodiments.
For example, the drain pipe bend 1 is not limited to use in a multi-story building. Further, the material for forming the drain pipe bend 1, the pipe diameter size, the degree of bending of the pipe axis, and the like are not limited at all. The pipe straight pipe portion 2a near the pipe end 3 can be replaced with another type such as a receptacle (socket or mechanical) type, a flange joint type, or the like.

  In the drain pipe system 20 shown in FIG. 12 and FIG. 13, it is of course possible to replace the bend 1 of the third embodiment with the bend 1 of the first or second embodiment.

It is a perspective view showing a 1st embodiment of the bend for drainage pipes concerning the present invention. FIG. 2 is a side view corresponding to FIG. 1. FIG. 3 is a front view corresponding to FIG. 2. FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2. It is a side view showing an example of the drainage pipe system using the bend for drainage pipes concerning the present invention. It is a top view showing another example of the drainage pipe system using the bend for drainage pipes concerning the present invention. It is a sectional side view showing the state where the drainage flow flows in the bend for drainage piping concerning the present invention. It is a front view showing a 2nd embodiment of the bend for drainage pipes concerning the present invention. It is a sectional side view showing a 3rd embodiment of the bend for drainage pipes concerning the present invention. FIG. 10 is a sectional view taken along line BB when the drainage pipe bend of FIG. 9 is used in a horizontal direction. FIG. 10 is a sectional view taken along line CC when the drainage pipe bend of FIG. 9 is used in a vertical direction. It is a perspective lineblock diagram of the drainage pipe system concerning the present invention constructed using the bend of a 3rd embodiment. FIG. 13 is a perspective configuration diagram of a drainage pipe system according to the present invention, showing another construction example different from FIG. 12. It is a side view showing a 4th embodiment of the bend for drainage pipes concerning the present invention. FIG. 15 is a sectional view taken along line D1-D2-D3-D4 of FIG. FIG. 15 is a view taken along line EE in FIG. 14. FIG. 15 is a view taken along line FF of FIG. 14. FIG. 15 is a plan sectional view with respect to FIG. 14. It is a side view showing a 5th embodiment of the bend for drainage pipes concerning the present invention. FIG. 20 is a sectional view taken along line G1-G2-G3-G4 of FIG. FIG. 20 is a view taken along line HH of FIG. 19. FIG. 20 is a view taken on line JJ of FIG. 19. FIG. 20 is a plan sectional view with respect to FIG. 19. It is a summary of the experimental methods and results of investigating the effect of the expanding direction of the bend (tube) on the pressure inside the offset piping. It is a summary of test facilities and results of examining the effect on the pressure in the pipe when the bend of the present invention is used for one-layer offset. 9 is a table summarizing test facilities and results of examining the effect on the pipe pressure when the bend of the present invention is used for a two-layer offset. It is a summary of test facilities and results of examining the effect on the pressure in the pipe when the bend of the present invention is used for three-layer offset. It is a summary of test facilities and results of examining the effect on the pipe pressure when the bend of the present invention is used for a pipe having a small offset. It is a summary of test facilities and results of examining the effect of the bend of the present invention on the pressure in the pipe when the bend of the present invention is used for a pipe in which a horizontal main pipe is continuously horizontally bent. It is a side view showing the conventional drainage pipe system.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Bend for drainage pipe 2 Pipe 3 Pipe end 4 Ventilation space 20 Drainage pipe system 100 Vertical main pipe 104 Horizontal part 105 Hanging part 110 Horizontal part 111 Horizontal part 120 Horizontal main pipe 121 Downward bent part 122 Offset part 125 Primary bent part 126 Secondary bend 127 Horizontal bend

Claims (10)

  In a drainage pipe bend having a pipe (2) having a bent pipe axis and pipe ends (3) formed on both sides of the pipe (2), a pipe inner diameter is provided at a bent portion of the pipe (2). A bend for drainage piping, wherein a ventilation space (4) is formed along the pipe axis direction.   The ventilation space (4) is formed by expanding the inner diameter of the tube toward one side along the bending direction of the bent portion of the tube (2), or by increasing the inner diameter of the tube toward the opposite sides. 2. The drain pipe bend according to claim 1, wherein the bend is formed by inflating.   In a drainage pipe bend having a pipe (2) with a bent pipe axis and pipe ends (3) formed on both sides of the pipe (2), the bent portion of the pipe (2) is a pipe end. A bend for a drainage pipe characterized in that the inner diameter of the pipe is larger than the nominal diameter of (3), and a ventilation space (4) can be formed in the pipe by the difference in inner diameter caused by the expansion.   The bent portion of the pipe body (2) is configured such that the difference in inner diameter caused by the expansion is decentered in one of the radial directions to form a ventilation space (4) in the pipe deviated to the eccentric side. The bend for a drainage pipe according to claim 3, characterized in that:   The drain pipe bend according to claim 4, wherein the eccentric direction of the pipe (2) is directed to one side along the bending direction of the pipe (2).   The drain pipe bend according to claim 3, characterized in that the diameter of the pipe (2) is increased coaxially with respect to a pipe axis connecting the pipe ends (3) on both sides.   The said pipe (2) is comprised by the connection of the joint pipe (10) which forms the pipe end part (3) of both sides, and the bending pipe part (2A) which forms a bending part. The bend for drainage pipe according to any one of claims 1 to 6.   In a drainage pipe system in which a horizontal main pipe (120) is connected to a lower portion of a vertical main pipe (100) and an offset portion (122) having a downwardly bent portion (121) is formed with respect to the horizontal main pipe (120), A drain pipe system comprising the drain pipe bend (1) according to any one of claims 1 to 7 as the bent portion (121).   A horizontal main pipe (120) is connected to the lower part of the vertical main pipe (100), and the horizontal main pipe (120) has a hook-and-eye type having a left and right primary bend (125) and a secondary bend (126). In a drain pipe system having a horizontal bent portion (127) formed therein, the drain pipe bend (1) according to any one of claims 1 to 7 is used as the secondary bent portion (126). A drainage pipe system characterized by the above.   A joint pipe (10) forming a pipe end of a pipe body, which has both ends in the axial direction, the nominal diameters of the both ends are different, and the axes of both ends are eccentric to each other. And fitting pipe.

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