JP2007217896A - Leg part bend for drain pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To most closely arrange a bend body to a slab under surface, by arranging a cleaning port in the lowest position to the bend body. <P>SOLUTION: This leg part bend has the bend body 5 having a straight pipe part 7 and a circular arc-shaped bend part 8 and a lid 6 for blocking up the cleaning port 4 formed in a side part 8a of the bend part 8. A connecting port 13 for a vertical drain pipe for connecting the vertical drain pipe 2 is formed in an end part of the straight pipe part 7. A connecting port 14 for a horizontal main drain pipe for connecting the horizontal main drain pipe 3 is formed in an end part of the bend part 8. The cleaning port 4 is arranged in a position near the connecting port 14 for the horizontal main drain pipe more than a bisectional point E of the bend part 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a leg bend used for a drain pipe in a building.

Conventionally, in a drainage pipe in a building, a leg bend is used as a joint for changing a pipe line from a vertical drainage stack to a horizontal drainage horizontal main pipe.
The leg bend includes a bent portion (bend portion) only, or a straight portion provided on the upper portion. Some leg bends are provided with a cleaning port to remove foreign substances clogged inside.

For example, the leg bend described in Patent Document 1 has a drainage stand connection port to which a drainage stand pipe is connected at one end thereof, and a drainage horizontal main pipe connection to which a drainage horizontal main pipe is connected to the other end. A bend body having a mouth is provided.
The bend body has a straight pipe portion and an arc-shaped bend portion. As shown in FIG. 13 of Patent Document 1, a midway portion of the straight pipe portion of the bend body is inserted into a through hole formed in the slab, and the through hole is fixed to the slab by being filled with mortar or the like. .

The bend portion of the bend main body is provided with a circular cleaning port on the side thereof through the tube wall. A lid is detachably provided at the cleaning port. The cleaning port is closed by a lid during normal times, and the inside of the pipeline can be cleaned by removing the lid during maintenance.
The cleaning port is disposed at the center of the bend portion in a side view.
Japanese Utility Model Publication No. 7-12696

For example, in places where piping space is limited, such as in a pit, leg bends should be installed in the upper position as much as possible so that the drainage horizontal main pipe can be placed close to the bottom surface of the ceiling slab in order to use the space as effectively as possible. Is desired.
However, in the conventional leg bend, the cleaning port is provided in the center of the bend, so when trying to bring the leg bend closer to the lower surface of the slab, the cleaning port becomes too close to the lower surface, Since it becomes difficult to perform the cleaning work and to attach / remove the lid to / from the cleaning port, there are cases where the limited piping space cannot be used effectively.

  The present invention has been made in view of the above circumstances, and the bend main body is provided as close to the lower surface of the slab as possible so that the cleaning port is disposed at a position as low as possible with respect to the bend main body. An object is to provide a leg bend that can be made.

In order to achieve the above object, the present invention has taken the following technical means.
That is, the leg bend according to the present invention is a drain pipe leg provided with a bend body having a straight pipe portion and an arc-shaped bend portion, and a lid for closing a cleaning port formed on a side portion of the bend portion. In the bend, forming a drainage stack connection port for connecting a drainage stack to the end of the straight pipe part, forming a drainage horizontal main pipe connection port for connecting a drainage horizontal main pipe to the end of the bend part, The cleaning port is provided at a position closer to the drainage horizontal main pipe connection port than the bisection point of the bend portion.

  According to this, since the cleaning port is provided at a position closer to the connection port for the drainage horizontal main pipe than the bisection point of the bend portion, the cleaning port can be arranged at a position as low as possible with respect to the bend body. Thus, the bend body can be provided as close to the lower surface of the slab as possible. Therefore, piping space can be saved, and for example, in the pit, it is possible to obtain a wide distance from the floor surface to the piping.

The lid has a cylindrical plug portion that fits into the cleaning port, and an end surface of the plug portion has a curved shape that is continuous with the inner surface of the bend portion. Positioning means for positioning the lid when the plug is fitted into the cleaning port is provided between the plug and the plug.
According to this, it is possible to prevent the lid from being displaced from a predetermined position and the end surface of the plug portion and the inner surface of the bend portion from becoming discontinuous. Therefore, the end surface of the plug portion of the lid and the inner surface of the bend portion are always continuous so that the water can be smoothly drained without impairing drainage.

The positioning means includes an arcuate inner surface part and a linear inner surface part formed in the cleaning port, an arcuate surface part formed on the plug part and facing the arcuate inner surface part, and the linear inner surface part. And a linear surface portion facing each other.
According to this, since the linear inner surface portion of the cleaning port and the linear surface portion of the lid face each other, the lid is positioned with respect to the cleaning port, so when the lid is attached to the cleaning port, The end surface is always continuous with the inner surface of the side of the bend. Therefore, the solid matter in the waste water hits the protruding portion of the plug and causes noise, and the solid matter does not accumulate in the inner surface recess of the cleaning port, and can smoothly flow without disturbing the flow of the waste water.

Further, the edge of the cleaning port on the inner surface side of the bend body and the edge of the end of the plug portion are chamfered, and the upstream portion of the edge of the plug portion is the upstream portion of the edge of the cleaning port. And the downstream portion of the edge portion of the cleaning port is chamfered more than the downstream portion of the edge portion of the plug portion.
According to this, even if a gap is formed between the cleaning port and the plug part of the lid, the drainage is made to be the joint portion (gap) by making the chamfer of the downstream portion larger than the upstream portion of the gap. ), The flow is disturbed as much as possible so that it can be discharged more smoothly downstream.

A bolt for fixing a lid is fixed around the cleaning port, and the lid has a flange portion for fixing the lid itself to the bend body. Is formed with an insertion hole through which the bolt is inserted, and the lid is guided to the bend main body side by inserting the bolt into the insertion hole.
According to this, according to this, the bolt can be used so as to guide (guide) the lid to the cleaning port, and the lid can be easily attached.

  According to the present invention, the bend main body can be provided as close as possible to the lower surface of the slab so that the cleaning port is disposed in a position as low as possible with respect to the bend main body.

The best mode for carrying out the present invention will be described below with reference to the drawings.
The leg bend 1 according to the present invention is used for, for example, a drainage pipe of a high-rise building, and connects the drainage stack 2 and the drainage horizontal main pipe 3 to change the pipe path from the vertical direction (vertical direction) to the horizontal direction. Is for.
As shown in FIGS. 1 to 3, the leg bend 1 includes a bend main body 5 in which a cleaning port 4 is formed in the middle portion and a lid 6 that closes the cleaning port 4. The bend main body 5 has a cylindrical shape and is of a so-called neck type having a straight pipe portion 7 and a bend portion 8.

  As shown in FIG. 1, a pipe hole 10 penetrating vertically is formed in the slab 9 on the lowest floor, and the leg bend 1 is inserted into the hole 10 for the pipe. The hole 10 is filled with mortar or the like, whereby the straight pipe part 7 and a part of the bend part 8 of the leg bend 1 are fixed in the hole 10. In this state, the straight pipe portion 7 of the leg bend 1 protrudes upward from the upper surface 9 a of the slab 9, and the bend portion 8 protrudes downward from the lower surface 9 b of the slab 9.

In this way, by configuring the bend body 5 with the straight pipe portion 7 and the bend portion 8, it is possible to fix the bend portion in a state where a part of the bend portion enters the hole 10. It can arrange | position as close to the lower surface of as much as possible.
Further, the straight pipe portion 7 is fixed to the upper surface 9a side of the slab 9 via the floor band 11, and the drainage horizontal main pipe 3 connected to the bend portion 8 projects downward from the lower surface 9b of the slab 9. It is fixed to the lower surface 9b side of the slab 9 via a holding band 12 provided on the tip side of the hanging bolt.

A drainage stack connection port 13 for connecting the drainage stack 2 is formed at one end of the bend body 5, that is, at the end of the straight pipe section 7.
The bend portion 8 is formed with a tube diameter that is larger than that of the straight tube portion 7, and is bent in a circular arc shape with a predetermined radius of curvature. A drainage horizontal main pipe connection port 14 for connecting the drainage horizontal main pipe 3 is formed at an end of the bend portion 8 (the other end of the bend main body 5).

The cleaning port 4 is formed in the side portion 8 a of the bend portion 8 of the bend body 5. Here, “formed on the side” means that the cleaning port 4 is provided so as to be shifted laterally from the center line C of the bend body 5 in a plan view (see FIG. 3). As shown in FIG. 3, the cleaning port 4 is provided on both side portions 8 a and 8 a of the bend portion 8.
In this embodiment, the cleaning port 4 provided in the side portion 8a of the bend portion 8 is provided such that the center F thereof coincides with the center line D of the bend portion 8 in a side view.

As shown in FIG. 3, the cleaning port 4 is formed inside a cylindrical portion 15 formed so as to protrude radially outward from the outer surface of the bend portion 8. The cleaning port 4 is a space partitioned by the inner surface of the cylindrical portion 15.
The cleaning port 4 has an arcuate inner surface portion 17 and a linear inner surface portion 18. That is, the inner surface of the cylindrical portion 15 includes a curved surface portion and a flat surface portion, the arc-shaped inner surface portion 17 refers to this curved surface portion, and the linear inner surface portion 18 refers to the flat surface portion. In addition, “arc shape” means that the edge of the curved surface portion is expressed in an arc shape in the side view shown in FIG. 2, and “linear shape” means that the edge of the flat surface portion is in the side view. It is expressed in a straight line.

  As shown in FIGS. 1 and 2, the linear inner surface portion 18 is formed above the center line D of the bend portion 8 in a side view. By doing so, the linear inner surface portion 18 is located in the ventilation region where air flows in the bend portion 8 or is provided in a position where a relatively low drainage flow flowing in the bend portion 8 passes. Thus, the drainage can be made to flow smoothly without impairing drainage.

Further, the linear inner surface portion 18 is formed with a predetermined inclination in a side view.
For example, the inclination of the linear inner surface portion 18 is set as follows. That is, the center F of the cleaning port 4 is set so as to coincide with the arc-shaped center line D of the bend portion 8 as described above, and the tangent to the center line D at this point (center F) and the straight line The inner surface portion 18 is set to be substantially parallel to the side view.

By setting the inclination of the linear inner surface portion 18 in this way, the linear inner surface portion 18 is formed in a direction substantially along the flow of the drainage in the bend portion 8, and therefore, solid matter or the like The drainage can flow without resistance without hitting the interface perpendicularly.
The cleaning port 4 is provided near the drainage horizontal main pipe connection port 14 in the side portion 8 a of the bend portion 8. Here, the “position near the drainage horizontal main connection port” means that at least the center F of the cleaning port 4 bisects the bend portion 8 in the direction along the center line D in the side view of the bend portion 8 ( Hereinafter, it is located closer to the drainage horizontal main connection port 14 side than the bisection point E). The “center of the cleaning port” refers to the center of curvature of the arc portion of the arc-shaped inner surface portion 17 of the cleaning port 4 in a side view as shown in FIG.

More preferably, the “position near the connection port for the drainage horizontal main pipe” of the cleaning port 4 is such that the entire cleaning port 4 and the center of curvature G of the arc-shaped center line D of the bend portion 8 in a side view are the bisectors. It is good to be formed so that it may be located between the straight line X1 which connects E, and the edge part of the connection port 14 for drainage horizontal main pipes.
Thus, by providing the cleaning port 4 at a position closer to the drainage horizontal main pipe connection port 14 than the bisection point E of the bend portion 8, the cleaning port 4 is positioned as low as possible with respect to the bend body 5. Will be placed. Therefore, even when the leg bend 1 is provided as close to the lower surface 9b of the slab 9 as possible in a limited piping space such as in a pit, the pipe can be cleaned via the cleaning port 4. In addition, the space below the leg bend 1 can be used effectively.

  A bolt 19 for fixing the lid 6 to the bend main body 5 is provided around the cleaning port 4. The bolt 19 is provided so as to protrude from the top surface 15 a of the cylindrical portion 15 along the cylindrical center direction of the cylindrical portion 15. One end of the bolt 19 is fixed to the top surface 15 a of the cylindrical portion 15. The cylinder portion 15 is provided with a plurality of bolts 19 (four in the illustrated example around one cleaning port 4). The bolt 19 plays a role of a guide pin when the lid 6 is attached to the cleaning port 4, and has an effect of easily positioning and guiding to the cleaning port 4 when the lid 6 is installed at a predetermined angle.

As shown in FIGS. 6 and 7, the lid 6 has a flange portion 21 for fixing the lid 6 itself to the bend main body 5 and a cylindrical plug portion 22 that fits into the cleaning port 4.
The flange portion 21 is formed with an insertion hole 23 through which the bolt 19 provided in the cylindrical portion 15 is inserted. A plurality of (four in the illustrated example) insertion holes 23 are formed in the flange portion 21.

  The lid 6 is formed by inserting the plug portion 22 into the cleaning port 4, inserting a bolt 19 provided around the cleaning port 4 into the insertion hole 23 of the flange portion 21, and fitting and tightening a nut 24 on the bolt 19. The flange portion 21 is fixed to the bend main body 5 in a state where the flange portion 21 is in contact with the top surface 15a of the cylindrical portion 15. A packing 25 is provided between the flange portion 21 and the top surface 15a of the cylindrical portion 15.

As described above, since the bolt 19 is fixed to the cylindrical portion 15, the bolt 19 can be easily inserted into the insertion hole 23 of the flange portion 21 of the lid 6, and thus the screw hole for screwing the bolt 19 into the cylindrical portion 15. Compared with the case where the screw hole and the insertion hole 23 of the flange portion 21 are aligned and fixed with a bolt, the lid 6 can be easily attached and detached.
The plug portion 22 is formed in a cylindrical shape whose end is closed, and is formed so as to protrude from one end surface of the flange portion 21.

  The end surface 22 a of the plug portion 22 has a curved surface shape that is continuous with the inner surface of the bend body 5 when the lid 6 is attached to the cleaning port 4. Since the bend portion 8 is formed in a cylindrical shape and curved in an arc shape in a side view, the inner surface of the side portion 8a of the bend portion 8 is around the cylinder center in the cross section of the bend portion 8. It is curved in an arc shape (see FIG. 4), and is a complicated curved surface curved in an arc shape in a side view.

The end surface 22a of the plug portion 22 of the lid 6 has a curved surface similar to the arc shape around the cylindrical center of the bend portion 8 in the same manner as the inner surface shape of the side portion 8a of the bend portion 8. The bent portion 8 is curved so as to match the arcuate curve in side view.
That is, as shown in FIG. 8, the bend portion 8 of the bend body 5 is curved in an arc shape, and the degree of the bend is based on the center line D of the bend body 5. The radius of curvature of the curve gradually decreases toward the center of curvature G, and the radius of curvature of the curve gradually increases toward the opposite side. In accordance with this, the inner surface of the bend portion 8 is set. Is such that the degree of curvature gradually changes in the direction along the straight line X1, and the end surface 22a of the plug portion 22 of the lid 6 is continuous with the inner surface of the bend portion 8. The curve shape is such that the degree of curvature gradually changes in a direction along a straight line X2 connecting the center of curvature G of the center line D of the bend portion 8 and the center F of the cleaning port 4.

On the outer peripheral surface of the stopper portion 22 of the lid 6, an arcuate surface portion 27 that faces the arcuate inner surface portion 17 of the cleaning port 4 and a linear surface portion 28 that faces the linear inner surface portion 18 of the cleaning port 4 are formed. Has been.
Here, "arc shape" means that a part of the edge 22b of the plug portion 22 is expressed in an arc shape when the end surface 22a of the plug portion 22 is viewed from the front. This means that a part of the edge 22b of the plug portion 22 is expressed in a straight line.

  Positioning means 29 is provided between the cleaning port 4 and the plug portion 22 of the lid 6 to position the lid 6 when the plug portion 22 is fitted into the cleaning port 4. The positioning means 29 includes an arcuate inner surface portion 17 and a linear inner surface portion 18 formed in the cleaning port 4, an arcuate surface portion 27 formed on the plug portion 22 and facing the arcuate inner surface portion 17, and The linear inner surface portion 18 and the linear surface portion 28 facing each other are provided.

  In a state where the lid 6 is attached to the bend body 5, the plug portion 22 is fitted into the cleaning port 4, and the plug portion 22 is formed by facing the linear inner surface portion 18 of the cleaning port 4 and the linear surface portion 28 of the plug portion 22. Positioning is performed and the lid 6 is regulated so as not to rotate around the cylindrical center of the plug portion 22. If the lid 6 is fixed to the bend main body 5 in this state, the end surface 22a of the plug portion 22 is always in a state of being continuous with the inner surface of the bend main body 5.

Therefore, the end surface 22a of the plug portion 22 and the inner surface of the bend main body 5 are not displaced, and the end portion of the plug portion 22 does not protrude from the inner surface of the bend main body 5 and the cleaning port 4 is not dented. It is possible to prevent the solid matter from colliding with the end portion of the plug portion 22, or to collect the solid matter in the concave portion on the inner surface of the cleaning port 4, and to prevent the generation of washing bubbles, thereby facilitating drainage.
In FIG. 5, the edge 4a of the cleaning port 4 on the inner surface side of the bend body 5 is chamfered over the entire periphery, and the edge 22b of the end of the plug portion 22 is also chamfered over the entire periphery. Yes. In addition, the arrow shown in FIG. 5 has shown the direction through which waste_water | drain flows.

As shown in FIG. 5, the chamfering of the edge portion 4 a of the cleaning port 4 and the chamfering of the edge portion 22 b of the end portion of the plug portion 22 are different in degree.
In other words, the upstream portion 31 of the edge 22 b of the plug portion 22 is chamfered larger than the upstream portion 32 of the edge 4 a of the cleaning port 4. Further, the downstream portion 34 of the edge portion 4 a of the cleaning port 4 is chamfered larger than the downstream portion 33 of the edge 22 b of the plug portion 22.

  In a state where the plug portion 22 is fitted into the cleaning port 4, there is a slight gap between the plug portion 22 and the cleaning port 4, in other words, between the outer peripheral surface of the plug portion 22 and the inner peripheral surface of the tube portion 15. A gap (in FIG. 5, an upstream gap is indicated by a symbol J and a downstream gap is indicated by a symbol K), and a downstream portion (upstream gap J) is provided for each of the gaps J and K. In this case, the upstream portion 31 of the plug portion 22 corresponds to this, and in the case of the downstream gap K, the downstream portion 34 of the cleaning port 4 corresponds to this). (In the case of the upstream gap J, the upstream portion 32 of the edge 4a of the cleaning port 4 corresponds to this, and in the case of the downstream gap K, the downstream portion 33 of the edge 22b of the plug portion 22 corresponds to this. Even if the drainage passes through the joint part, the part on the downstream side with respect to the gap Since the chamfer is greatly chamfered, the drainage flows smoothly without disturbing the flow, and foreign matter in the drainage is present in the upstream portion 31 of the plug portion 22 and the downstream portion 34 of the cleaning port 4. You can avoid getting caught.

The present invention is not limited to the above-described embodiment, and various changes and modifications can be made.
For example, the positioning means 29 of the lid 6 is not limited to the above-described case, and as shown in FIG. 9, a concave strip portion 36 formed on the inner surface of the cylindrical portion 15 of the bend portion 8 along the cylindrical center direction, and the lid The cap 6 can be formed by a convex portion 37 formed on the outer peripheral surface of the plug portion 22, and the lid 6 can be positioned by fitting the concave portion 36 and the convex portion 37. Further, as shown in FIG. 10, the concave portion 36 is formed on the outer peripheral surface of the plug portion 22 along the longitudinal direction, and the convex portion 37 is formed on the inner peripheral surface of the cylindrical portion 15 of the bend portion 8. The lid 6 can also be positioned by forming it.

  As shown in FIGS. 9 and 10, positioning of the lid 6 is performed by providing positioning means 29 in a part of the periphery of the cleaning port 4 and also by providing positioning means 29 at the corresponding position in the corresponding plug portion 22. Can do.

  The present invention can be used, for example, for building drainage piping.

It is a side view of a piping way using a leg part bend. It is a longitudinal cross-sectional view of a neck type leg bend. It is a top view of a leg bend. It is an AA arrow line sectional view of FIG. It is a BB arrow line partial sectional view of FIG. It is a top view of a lid | cover. It is a side view of a lid. It is a longitudinal cross-sectional view of a leg bend. It is a longitudinal cross-sectional view of the leg bend which shows the other example of a positioning means. It is a longitudinal cross-sectional view of the leg bend which shows the other example of a positioning means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg part bend 2 Drainage standpipe 3 Drainage horizontal main pipe 4 Cleaning port 4a Edge 5 Bend main body 6 Lid 7 Straight pipe part 8 Bend part 8a Side part 13 Drainage vertical pipe connection port 14 Drainage horizontal main pipe connection port

Claims (5)

In a drain pipe leg bend comprising a bend body having a straight pipe portion and an arc-shaped bend portion, and a lid for closing a cleaning port formed on a side portion of the bend portion,
A drainage stand connection port for connecting a drainage standpipe to the end of the straight pipe part is formed, a drainage horizontal main pipe connection port for connecting a drainage horizontal main pipe to the end part of the bend part, and the cleaning port However, the drain pipe leg bend is provided at a position closer to the drain horizontal main pipe connection port than the bisection point of the bend section. The lid has a cylindrical plug portion that fits into the cleaning port, and the end surface of the plug portion has a curved shape that is continuous with the inner surface of the bend portion,
2. A drainage pipe according to claim 1, wherein positioning means for positioning the lid is provided between the cleaning port and the plug portion of the lid when the plug portion is fitted into the cleaning port. Leg bend.   The positioning means includes an arcuate inner surface portion and a linear inner surface portion formed at the cleaning port, an arcuate surface portion formed at the plug portion and facing the arcuate inner surface portion, and the linear inner surface portion. The leg part bend for drainage piping according to claim 2 provided with a straight surface part to do. The edge of the cleaning port on the inner surface side of the bend body and the edge of the end of the plug are chamfered,
The upstream portion of the edge of the plug portion is chamfered larger than the upstream portion of the edge portion of the cleaning port, and the downstream portion of the edge portion of the cleaning port is more downstream than the downstream portion of the edge of the plug portion. The leg bend for drainage pipe according to claim 2 or 3, wherein the leg bend is greatly chamfered.   Bolts for fixing the lid are fixed around the cleaning port, and the lid has a flange portion for fixing the lid itself to the bend main body. The insertion hole which penetrates the said volt | bolt is formed, It is comprised so that a lid may be guided to the bend main body side by inserting the said volt | bolt in the said insertion hole. The bend part for drain piping of any one of Claims.

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