JP4810285B2 - Drainage system - Google Patents

Description

  The present invention relates to a drainage system including a drainage collecting pipe joint interposed for each floor with respect to a drainage stack of a multi-layered building, and a plurality of side branch pipes connected to the drainage collecting pipe joint.

  In multi-layer buildings such as apartment houses, hotels, and hospitals, drainage stacks that run vertically through each floor are provided for drainage. Further, the drainage stack is provided with a drainage collecting pipe joint for each floor, and a plurality of horizontal branch pipes are connected to each drainage collecting pipe joint. For example, when used in a multi-story building, the side branch pipe is connected to the drain pipe of a household facility such as a toilet, bath, sink, and sink that is installed at one end of the house. The end is connected to the drainage collecting pipe joint described above, and the drainage from the household equipment is allowed to flow to the drainage collecting pipe joint.

  In addition, a plurality of side branch pipes are connected to such a drainage collecting pipe joint at substantially the same height, and two of the side branch pipes face each other (mutual pipes face each other). Connected). In such a connection state, when a strong drainage such as toilet drainage flows from one side branch pipe to the drainage collecting pipe joint, the drainage jumps over the drainage collecting pipe joint because the drainage has a strong momentum. It may flow into the side branch pipe. The toilet drainage naturally contains a large amount of filth, so if the toilet drainage flows into the other side branch pipe and does not flow down to the drainage collecting pipe joint, it remains indoors from the other side branch pipe. There was a problem that a bad smell came up.

  The mechanism by which strong drainage flows into the opposite side branch pipes will be described using two specific examples of toilet drainage.

  First, the wall-draining toilet 140 as shown in FIG. 13 has a drainage dropping part 120a on the back of the wall, that is, after the drainage is dropped by the first bent part 124, the second bent part 125 below the floor. Therefore, the drainage is bent in the horizontal direction and guided to the drainage collecting pipe joint 110. The drainage of this toilet pipe flows along the curved surface of the inner wall of the second bent portion 125 after the water strength becomes strong due to the fall at the first bent portion 124, and as shown by the arrow in the figure due to the strong water force. , Jumps upward (winds up to the top of the tube). Moreover, since the wall drain type toilet pipe has two bent portions as described above, and the distance from the second bent portion 125 to the drainage collecting pipe joint 110 is short, a floor drain type toilet pipe (described later) In many cases, the horizontal portion 121 becomes shorter. Accordingly, the drained water jumping (rolling up to the top of the pipe) as described above jumps over the drainage collecting pipe joint 110 without landing on the pipe bottom of the horizontal portion 121 and flows into the opposite side branch pipe 130. I was sorry.

  Further, a floor drain type toilet 140 as shown in FIG. 14 often uses a method called a siphon type, and this method has a feature that the momentum of drainage increases. Since this toilet drainage is extremely strong, the drainage reaches the mouth of the opposite side branch pipe 130 and flows into the interior, or as shown by the arrows in the figure, a part of the toilet drains inside the side branch pipe 130. Or had flowed into.

Therefore, Patent Document 1 proposes a drainage collecting pipe joint for preventing the inflow of drainage into such an opposite lateral branch pipe. In this drainage collecting pipe joint, two pipe ports are provided in an orthogonal direction, and an elbow joint is integrally provided in one of the pipe ports. In the present invention, since the two side branch pipes connected to the drainage collecting pipe joint do not face each other, strong drainage such as toilet drainage does not flow from one side branch pipe into the other side branch pipe. .
JP 2004-84394 A

  However, in a multi-layered building, the piping space for installing the drainage collecting pipe joint is limited, and the drainage collecting pipe joint described above has an elbow joint integrally, and the volume must be increased accordingly. Therefore, there was a problem that it could not fit in the piping space.

  Moreover, when manufacturing such a drainage collecting pipe joint, the drainage collecting pipe joint and the elbow joint are integrally formed, so that an expensive mold having a complicated shape is separately required, which increases the manufacturing cost. There was a problem such as.

  Furthermore, since one side branch pipe is connected to the drainage collecting pipe joint via the elbow joint, the pipe axis of the one side branch pipe and the other side branch pipe is shifted. For this reason, the design of the piping of the side branch pipe may be limited as compared with the conventional drainage collecting pipe joint connected to the side branch pipe in a substantially opposite state.

  The present invention has been made in view of such circumstances, and its purpose is to allow two side branch pipes to be connected to a drainage collecting pipe joint in an opposing state, while drainage from one side branch pipe is the other. It is intended to provide a drainage system that can prevent the pipe from flowing into the horizontal branch pipe, can cope with a limited piping space, and can use an existing drainage pipe joint in a multi-layered building.

  In order to solve the above-described problems, a drainage system according to the present invention includes a drainage collecting pipe joint interposed on each floor with respect to a drainage stack of a multi-layer building, and a plurality of side branches connected to the drainage collecting pipe joint. A drainage system in which two of the horizontal branch pipes are substantially opposed to each other by the drainage collecting pipe joint, and at least one of the horizontal branch pipes is provided with a dropping portion where the drainage falls. In one horizontal branch pipe, an upper wall of a predetermined region of the horizontal portion is bulged inward and both side walls are bulged outwardly in a horizontal portion formed on the drainage collecting pipe joint side from the dropping portion. It is characterized in that a drainage speed reduction part is provided.

  According to the present invention as described above, the drainage deceleration part has the upper wall of the predetermined part of the horizontal part (substantially horizontal or slightly inclined) bulged inward and the both side walls bulged outward. Therefore, the drainage diffuses at the portion where the both side walls of the drainage reduction portion are widened and collides with the side walls at the portion where the drainage returns to the narrower width, thereby reducing the flow rate of the drainage. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint and flows into the opposite side branch pipes.

  That is, in the wall drainage type toilet piping, the drainage that jumps at the second bent portion collides with the portion bulging inside the upper portion of the drainage deceleration portion, so that the drainage falls to the tube bottom while weakening the water force, The drainage does not flow over the drainage collecting pipe joint and flows into the opposite side branch pipe.

  Moreover, it is preferable that the cross-sectional area of the said drainage deceleration part shall be 90 to 110% of range with respect to the cross-sectional area of areas other than the drainage deceleration part in a horizontal part.

  If the ratio of the cross-sectional area of the drainage reduction part is less than 90%, the drainage may flow in a full state in the drainage reduction part, so that the toilet is caused by the siphon phenomenon caused by the full water condition in the pipe. There is a risk of draining even the trap seal water. Moreover, since the material cost required for manufacture of a drainage deceleration part will increase when the ratio of the cross-sectional area of a drainage deceleration part exceeds 110%, it is unpreferable.

  Further, the drainage system of the present invention includes a drainage collecting pipe joint interposed for each floor with respect to the drainage stack of the multi-layered building, and a side branch pipe connected to the drainage collecting pipe joint. In the drainage system in which two of the side branch pipes are substantially opposed to each other by the drainage collecting pipe joint, a predetermined area of the horizontal part is meandered in the horizontal direction in the horizontal part of at least one of the side branch pipes. It is characterized in that a drainage speed reduction portion formed by the above is provided.

  According to the present invention, the drainage reduction part is formed by meandering the horizontal part of the horizontal branch pipe in the horizontal direction in a predetermined region, so that the wastewater collides with the side wall of the drainage reduction part. The flow rate of drainage is weakened. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint and flows into the opposite side branch pipes.

  In addition, the drainage speed reducing portion has substantially the same pipe axis on the inflow side and the outflow side, and one side wall of the drainage speed reduction portion protrudes inward in a substantially V shape in a top sectional view and the other side wall. May be a substantially semicircular arc as viewed from above and projecting outward.

  In this case, since the pipe shafts of the inflow side and the outflow side of the drainage reduction unit are substantially the same, a simple piping design similar to that of a conventional side branch pipe can be performed.

  In addition, one side wall of the drainage deceleration portion is projected inward in a substantially V shape (angle of 45 ° or less) in the upper cross section, and the other side wall is projected outward in a substantially semicircular shape in the upper cross section. The length of the side branch pipe can be shortened, and the side branch pipe can be satisfactorily installed even in a place where the installation space of the side branch pipe is limited.

  In addition, the drain speed reducing portion has substantially the same pipe axis on the inflow side and the outflow side, and the cross section area of the drain speed reduction portion is 90 to the cross sectional area of the region other than the drain speed reduction portion in the horizontal portion. The range may be 110%, and the distance between the inflow side end and the outflow side end of the drainage reduction unit may be the shortest.

  In this case, since the pipe shafts of the inflow side and the outflow side of the drainage reduction unit are substantially the same, a simple piping design similar to that of a conventional side branch pipe can be performed.

  Further, the cross-sectional area of the drainage speed reduction part is in the range of 90 to 110% with respect to the cross-sectional area of the region other than the drainage speed reduction part in the horizontal part, and the distance between the inflow side end part and the outflow side end part of the drainage speed reduction part Therefore, the length of the side branch pipe can be shortened, and the side branch pipe can be satisfactorily installed even in a place where the installation space of the side branch pipe is limited.

  Further, the projection surface of the pipe cross section in the region other than the drain speed reduction portion in the horizontal portion, and the pipe cross section at the location where the displacement is the largest in the region of the drain speed reduction portion from the side branch pipe in the region other than the drain speed reduction portion. The overlap width with the projection surface may be 1/3 or less of the inner diameter of the tube in the horizontal portion.

  In this case, since there is almost no drainage that passes without colliding with the tube wall, the flow rate of the drainage is reduced. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint and flows into the opposite side branch pipes.

  Further, the drainage system of the present invention includes a drainage collecting pipe joint interposed for each floor with respect to the drainage stack of the multi-layered building, and a side branch pipe connected to the drainage collecting pipe joint. In the drainage system in which two of the side branch pipes are substantially opposed to each other by the drainage collecting pipe joint, a predetermined region of the horizontal part is cranked horizontally in at least one of the side branch pipes. It is characterized in that a drainage speed reduction part formed by bending in a shape is provided.

  According to the present invention as described above, the drainage reduction part is formed by bending the horizontal part of the horizontal branch pipe in a crank shape in the horizontal direction in a predetermined region. It will collide with the pipe wall and the drainage flow rate will be weakened. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint and flows into the opposite side branch pipes.

  In addition, the overlapping width between the projection surface of the pipe cross section on the inflow side of the drainage reduction portion in the horizontal portion and the projection plane of the pipe cross section on the outflow side of the drainage reduction portion is 1/3 of the pipe inner diameter in the horizontal portion. The following may be used.

  In this case, since there is almost no drainage that passes without colliding with the tube wall, the flow rate of the drainage is reduced. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint and flows into the opposite side branch pipes.

  In addition, the drainage deceleration unit may be provided with a swirl flow blocking barrier that blocks swirl flow at a predetermined position. Here, the swirling flow is because the pipe bottom on the inflow side of the meandering drainage speed reduction part is a curved surface, and the drainage runs up along the pipe wall from the pipe surface on the inflow side of the drainage speed reduction part, It refers to the drainage that flows in the direction of the tube axis while turning without any weakening of the water.

  In this case, since a swirl flow blocking barrier that inhibits swirling flow is provided at a predetermined position of the drainage deceleration unit, the swirling flow collides with the swirling flow blocking barrier, thereby weakening the water force and finally draining Stops turning. Therefore, it is possible to reliably prevent the drainage having a strong water flow from jumping over the drainage collecting pipe joint and flowing into the opposing lateral branch pipe.

  The drainage system of the present invention prevents the drainage from one side branch pipe from flowing into the other side branch pipe while allowing the two side branch pipes to be connected to the drainage collecting pipe joint in an opposed state. It is possible to cope with a limited piping space, and it is possible to use an existing drainage pipe joint in a multi-layer building.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
An example in which the present invention is applied to a wall drain type toilet pipe will be described with reference to FIGS.

  1A is a side view showing the drainage system in the present embodiment, FIG. 1B is a plan view showing the drainage system, FIG. 2 is a cross-sectional view corresponding to FIG. 1A, and FIGS. These are sectional drawings which show each Example of a drainage deceleration part, In these FIG. 3 thru | or FIG. 5, (a) is a sectional side view, (b) is a horizontal sectional view, (c) is an AA sectional view. The figure and (d) are BB line sectional views.

  The drainage system 1 of the present embodiment includes a drainage collecting pipe joint 10 and two side branch pipes 20 and 30 facing each other.

  The drainage collective pipe joint 10 is provided for each floor with respect to a drainage stack 50 piped vertically through each floor of a multilayered building or the like. A plurality of side branch pipes 20 and 30 to be described later are connected to the drainage collecting pipe joint 10, and two of the side branch pipes 20 and 30 face each other at substantially the same height in the drainage collecting pipe joint 10. It is in a state.

  One end of the horizontal branch pipe 20 is connected to a drain pipe of a household facility such as a toilet, a bath, a sink, and a wash basin in the residence, and the other end is connected to the drain collecting pipe joint 10. Further, the horizontal branch pipe 20 is formed with a dropping portion 20a where the drainage falls, and the horizontal portion between the floor 61 and the floor slab 62 is disposed on the side of the drainage collecting pipe joint 10 from the dropping portion 20a of the horizontal branch pipe 20. 21 is formed.

  The horizontal portion 21 is provided with a drain speed reducing portion 22 in a predetermined area of the horizontal portion 21.

  As shown in FIG. 3, the drainage speed reduction part 22 has a shape in which the upper wall 22a of the drainage speed reduction part 22 bulges inward and the side walls 22b and 22c bulge outward. As a result, the drainage diffuses at the inlet 22d where the side walls 22b, 22c of the drainage speed reduction part 22 are widened, and collides with the pipe walls 22b, 22c at the both sides at the outlet 22e returning to a narrower width. This slows down the flow rate of the waste water. Further, as shown in FIG. 2, the drainage from the toilet 40 falls at the dropping portion 20 a and jumps by the second bent portion 25 as indicated by an arrow in the figure. It collides with the portion 22a bulging inward, thereby falling to the tube bottom while weakening the water force, so that the drainage does not jump over the drainage collecting pipe joint 10 and flow into the opposite side branch tube 30.

  Here, it is preferable that the cross-sectional area of the drainage speed reduction part 22 is 90 to 110% of the cross-sectional area of the region other than the drainage speed reduction part 22 in the horizontal part 21. If the ratio of the cross-sectional area of the drainage deceleration unit 22 is less than 90%, the drainage may flow in a full state in the drainage deceleration unit 22, so the siphon phenomenon caused by the occurrence of a full condition in the pipe As a result, there is a possibility that even the trap water of the toilet 40 or the like is drained. Moreover, since the material cost required for manufacture of the drainage deceleration part 22 will increase when the ratio of the cross-sectional area of the drainage deceleration part 22 exceeds 110%, it is unpreferable.

  The drainage decelerating part 22 is not particularly limited as long as the upper wall bulges inward and both side walls bulge outward, not limited to the example shown in FIG. For example, a shape as shown in FIG. 4 or 5 can also be used.

  In the drainage speed reduction part 22 shown in FIG. 4, the length of the bulging portion 22a is approximately halved compared to that shown in FIG. In this way, by shortening the length of the drainage speed reducing portion 22, the length of the horizontal branch pipe 20 in the tube axis direction is shortened, so that no installation space is required, so that the degree of freedom of installation is higher. It becomes.

  The drainage speed reduction part 22 shown in FIG. 5 forms the bulging part 22a in a substantially V shape in a side sectional view, so that the length of the bulging part 22a is about a quarter of that shown in FIG. It is said. Therefore, the length of the drainage speed reducing portion 22 is shorter than that shown in FIGS. 3 and 4 described above, and accordingly, the length of the side branch pipe 20 in the tube axis direction is shortened, further reducing the installation space. In addition, the degree of freedom of installation becomes higher.

[Embodiment 2]
An example in which the present invention is applied to a floor drain type toilet pipe will be described with reference to FIGS.

  FIG. 6 shows a drainage system according to the present embodiment, FIG. 6 (a) is a side view showing the drainage system, and FIG. 6 (b) is a plan view showing the drainage system.

  The drainage system 1 of the present embodiment includes a drainage collecting pipe joint 10 and two side branch pipes 20 and 30 facing each other.

  The drainage system 1 of the present embodiment has the same configuration as that of the first embodiment described above except for the drainage reduction part 22 provided in the horizontal part 21 of the side branch pipe 20, so The same reference numerals are given and the description thereof is omitted, and only the drainage speed reduction unit 22 which is a difference will be described.

  As shown in FIGS. 6B and 7, the drainage speed reduction part 22 in the present embodiment is formed by meandering the horizontal part 21 of the horizontal branch pipe 20 in the horizontal direction in a predetermined region. As a result, as shown by arrows in FIG. 6B, the wastewater collides with the pipe wall of the drainage speed reduction unit 22, and the drainage flow velocity is weakened. And the flow into the opposite lateral branch pipe 30 is reduced.

  The drainage reduction part 22 is not particularly limited as long as it is meandering in the horizontal direction. For example, as shown in FIG. 8, the inner diameter of the pipe extends from the inflow side 22d to the outflow side 22e of the drainage reduction part 22. Is substantially constant, or has two meandering portions 22f as shown in FIG.

  Further, as shown in FIG. 8 described above, the drain speed reducing portion 22 has substantially the same pipe axis on the inflow side 22d and the outflow side 22e, and one side wall of the drain speed reduction portion 22 is substantially in a top sectional view. It is preferably V-shaped and protrudes inward, and the other side wall protrudes outward in a substantially semicircular shape when viewed from above. In this case, since the pipe axes of the inflow side 22d and the outflow side 22e of the drainage speed reducing unit 22 are substantially the same, a simple piping design similar to that of the conventional side branch pipe 20 can be performed. In addition, since one side wall of the drainage speed reducing unit 22 is substantially V-shaped when viewed from the upper cross section and protrudes inward, and the other side wall is substantially semicircular when viewed from the upper cross section and protrudes outward, the side branch pipe 20 The length can be shortened, and the side branch pipe 20 can be satisfactorily installed even in a place where the installation space of the side branch pipe 20 is limited.

  In addition, the drain speed reducing portion 22 has substantially the same pipe axis on the inflow side 22d and the outflow side 22e, and the cross sectional area of the drain speed reducing portion 22 in the region other than the drain speed reducing portion 22 in the horizontal portion 21. On the other hand, it is preferable that the range is 90 to 110%, and that the distance between the end of the inflow side 22d and the end of the outflow side 22e of the drainage reduction unit 22 is the shortest. In this case, since the pipe axes of the inflow side 22d and the outflow side 22e of the drainage speed reducing unit 22 are substantially the same, a simple piping design similar to that of the conventional side branch pipe 20 can be performed. In addition, the cross-sectional area of the drainage speed reduction part 22 is in a range of 90 to 110% with respect to the cross-sectional area of the region other than the drainage speed reduction part 22 in the horizontal part 21, and the inflow side 22d end and the outflow side of the drainage speed reduction part 22 Since the distance to the end of 22e is the shortest, the length of the side branch pipe 20 can be shortened, and the side branch pipe 20 can be satisfactorily used even in a place where the installation space of the side branch pipe 20 is limited. Can be installed.

  Further, in any of the above-described examples of FIGS. 7 to 9, as shown in FIG. 7, the projection surface 26 a of the pipe cross-section 26 in the region other than the drainage reduction part 22 in the horizontal part 21, and the drainage reduction part 22. The overlap width 28 with the projection surface 27a of the pipe cross section 27 at a position most deviated from the lateral branch pipe 20 in the area other than the drainage speed reducing portion 22 in the area of 1) is 1/3 or less of the pipe inner diameter 29 in the horizontal portion 21. It is preferable that Thereby, since there is almost no waste water that passes without colliding with the pipe wall, the flow rate of the waste water is reduced. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint 10 and flows into the opposite lateral branch pipe 30.

  Furthermore, the drainage speed reduction part 22 is not limited to the meandering type as described above, and for example, as shown in FIG. 10, the horizontal part 21 of the side branch pipe 20 is bent in a crank shape in the horizontal direction in a predetermined region. It may be formed by.

  Even in this case, as shown in FIG. 10, projection of the projection surface 26 a of the pipe cross-section 26 on the inflow side 22 d of the drain speed reduction portion 22 and the pipe cross-section 27 of the outflow side 22 e of the drain speed reduction portion 22 in the horizontal portion 21. It is preferable that the overlap width 28 with the surface 27 a is 1/3 or less of the tube inner diameter 29 in the horizontal portion 21. Thereby, since there is almost no waste water that passes without colliding with the pipe wall, the flow rate of the waste water is reduced. Therefore, the drainage with a strong water flow jumps over the drainage collecting pipe joint 10 and flows into the opposite lateral branch pipe 30.

  By the way, in the case where the drainage speed reduction part 22 is formed by meandering or bending in a crank shape as described above, the drainage is swirling in the drainage speed reduction part 22 (while turning without any weakening of the water force). There is a strong tendency to become drainage flowing in the pipe axis direction. For this reason, in the drainage deceleration part 22 in this Embodiment, it is good to provide the swirl flow inhibition barrier 23 which inhibits a swirl flow in the predetermined position.

  That is, as shown in FIG. 12, the drainage with a strong water flow that has traveled straightly runs up from the tube bottom on the inflow side 22d of the drainage reduction unit 22 along the tube wall and becomes a swirl flow X with almost no weakening of the water flow. It flows while turning to the side 22e. In addition, the wastewater that has traveled obliquely along the bottom of the pipe on the inflow side 22d of the drainage speed reduction unit 22 becomes a swirling flow Y in the vicinity of the outlet of the drainage speed reduction unit 22 and flows while swirling to the outflow side 22e with almost no weakening of water. To go. Thereafter, since the swirling flows X and Y are swirling in opposite directions, they collide with each other at the upper part of the outflow side 22e of the drain speed reducing unit 22 and become a flow Z that goes straight to the drain collecting pipe joint 10. This flow Z has a small amount of flow velocity reduction in the direction of the pipe axis. Therefore, when the water flow from the toilet 40 is extremely strong, the flow Z jumps over the drainage collecting pipe joint 10 and flows into the opposite side branch pipe 30. There was something to do.

  Therefore, as shown in FIG. 11, the first swirl flow blocking barrier 23 a is placed on the upper part of the pipe wall of the outlet 22 e of the drain speed reducing unit 22 in a direction substantially orthogonal to the swirl flow X shown in FIG. If the second swirl flow blocking barrier 23b is provided in a direction substantially orthogonal to the first swirl flow blocking barrier 23a, the first swirl flow blocking barrier 23a blocks the swirling flow X, and the second swirling flow blocking barrier 23b blocks the swirling flow Y. Inhibit. This will weaken the drainage and eventually stop turning. Therefore, it is possible to reliably prevent the drainage having a strong water flow from jumping over the drainage collecting pipe joint 10 and flowing into the opposing side branch pipe 30.

  Here, in the floor drainage type toilet 40, when draining the sewage in the toilet 41, there is a type in which a swirl vortex is formed in the toilet 41 by running water and the surface of the toilet 41 is drained while being washed. . In such toilet piping, the swirling vortex may cause swirling to form a swirling flow in front of the drain speed reducing unit 22 in the side branch pipe 20. Therefore, when the drainage swirls counterclockwise with respect to the flow direction, the swirling flow is formed by bending the drainage reduction portion 22 to the left with respect to the drainage flow direction in a meandering or crank shape. Can be extinguished. On the contrary, when the drainage turns clockwise, the drainage speed reduction part 22 is formed by meandering or bending in a crank shape on the right side with respect to the flow direction of the drainage. Can be extinguished. Therefore, it is possible to reliably prevent the drainage having a strong water flow from jumping over the drainage collecting pipe joint 10 and flowing into the opposing side branch pipe 30.

  The swirl flow blocking barrier 23 is not particularly limited as long as the swirl flow X and Y can be blocked. For example, any one of the inflow side 22d, the intermediate position 22g, and the outflow side 22e of the drainage speed reduction unit 22 can be used. One or a plurality of pipe walls can be provided. The swirl flow blocking barrier 23 is preferably provided on the upper wall of the tube as much as possible, so that waste water or solid matter flowing together with the drainage does not stay in the swirl flow blocking barrier 23.

  Moreover, you may use the drain deceleration part 22 demonstrated in Embodiment 2 for the floor drain type toilet piping demonstrated in Embodiment 1. FIG.

The drainage system in Embodiment 1 of this invention is shown, Fig.1 (a) is a side view, FIG.1 (b) is a top view. It is sectional drawing corresponding to Fig.1 (a) which shows the drainage system in Embodiment 1 of this invention. FIG. 3 shows a drain reduction part in Embodiment 1 of the present invention, FIG. 3A is a side sectional view, FIG. 3B is a horizontal sectional view, and FIG. 3C is a sectional view taken along line AA in FIG. FIG. 3 and FIG. 3D are cross-sectional views taken along line BB in FIG. Fig. 4 shows another example of the drainage speed reducing portion according to Embodiment 1 of the present invention, in which Fig. 4 (a) is a side sectional view, Fig. 4 (b) is a horizontal sectional view, and Fig. 4 (c) is A in Fig. 4 (a). -A sectional view, FIG.4 (d) is BB sectional drawing in Fig.4 (a). Fig. 5 shows still another example of the drainage reduction portion in the first embodiment of the present invention, Fig. 5 (a) is a side sectional view, Fig. 5 (b) is a horizontal sectional view, and Fig. 5 (c) is in Fig. 5 (a). AA line sectional view and Drawing 5 (d) are BB line sectional views in Drawing 5 (a). The drainage system in Embodiment 2 of this invention is shown, Fig.6 (a) is a side view, FIG.6 (b) is a top view. FIG. 7A is a sectional view, and FIG. 7B is a diagram for explaining an overlapping width of projection surfaces, showing a drainage reduction portion in Embodiment 2 of the present invention. It is sectional drawing which shows the other example of the drainage deceleration part in Embodiment 2 of this invention. It is sectional drawing which shows the further another example of the drainage deceleration part in Embodiment 2 of this invention. FIG. 10A is a cross-sectional view, and FIG. 10B is a diagram for explaining the overlapping width of projection planes, showing still another example of the drainage reduction portion in Embodiment 2 of the present invention. It is sectional drawing which shows the further another example of the drainage deceleration part in Embodiment 2 of this invention. It is explanatory drawing which shows the swirl | vortex flow in a drainage deceleration part. It is the schematic which shows the piping of the toilet of the conventional wall drainage. It is the schematic which shows the piping of the toilet of the conventional floor drainage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drainage system 10 Drainage collecting pipe joint 20 Side branch pipe 20a Falling part 21 Horizontal part 22 Drain reduction part 23 Swirling flow inhibition barrier 23a First swirl flow inhibition barrier 23b Second swirl flow inhibition barrier 30 Opposing side branch pipe 40 Toilet 50 Drainage standpipe

Claims (2)

A drainage collecting pipe joint interposed on each floor with respect to the drainage stack of the multilayer building,
A plurality of side branch pipes connected to the drainage collecting pipe joint,
In the drainage system in which two of the side branch pipes are substantially opposed to each other at the drainage collecting pipe joint, and at least one of the side branch pipes is provided with a falling portion where the drainage falls.
The upper wall of a predetermined region of the horizontal portion is bulged inward and the both side walls are bulged outward in a horizontal portion formed on the drainage collecting pipe joint side from the dropping portion of the one side branch pipe. A drainage system characterized by a drainage reduction part. The drainage system according to claim 1,
The drainage deceleration section, the cross-sectional area, waste water system which is in the range 90 to 110% with respect to the cross-sectional area of the region other than the drainage deceleration section in the horizontal section.

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