JP7807045B2 - Drainage pipe joint and guide member used in drainage pipe joint - Google Patents

Description

The present invention relates to a drainage pipe joint that is inserted into a penetration in a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors, and to which a horizontal drainage branch pipe on the floor slab is connected, as well as a guide member used in the drainage pipe joint.

Patent Document 1 describes a drain pipe fitting used in building drainage systems. The drain pipe fitting 100 described in Patent Document 1 includes a body 120 through which drainage water flows, as shown in Figure 13. The body 120 of the drain pipe fitting 100 is formed with an upper receptacle 122 at its upper end to which a drainage standpipe (not shown) on an upper floor is connected, and a lower end connection portion 124 at its lower end to which a drainage standpipe (not shown) on a lower floor is connected. Furthermore, as shown in Figures 13 and 14, a plurality of horizontal branch pipe receptacles 126 are formed circumferentially on the upper side surface of the body 120 of the drain pipe fitting 100 to which horizontal drainage branch pipes (not shown) on the floor slab are connected. Furthermore, on the inner wall surface of the body 120 of the drain pipe fitting 100, a first swivel guide 128 and a second swivel guide 129 are provided at a position lower than the horizontal branch pipe receptacle 126, with a phase difference of 180°, for swirling the drainage water flowing down inside the body 120.

Japanese Patent Application Laid-Open No. 2017-119960

In the drain pipe fitting 100, the first swirl guide 128 and the second swirl guide 129 swirl the drainage water flowing downward, generating two swirling flows along the inner wall surface of the body 120. This creates an air core in the center of the body 120, preventing negative pressure inside the body 120 and ensuring the drainage performance of the drain pipe fitting 100. However, as buildings become taller, it becomes more difficult to create an air core in the center of the body 120 of the drain pipe fitting 100. For this reason, drain pipe fittings used in super-high-rise buildings are designed to increase the vertical dimension of the body and the number of swirl guides to further swirl the drainage water flowing downward. Therefore, drain pipe fittings 100 for mid- to high-rise buildings generally have different structures from those for super-high-rise buildings. This makes it necessary to prepare two types of fittings: drain pipe fittings 100 for mid- to high-rise buildings and drain pipe fittings for super-high-rise buildings.

The present invention was made to solve the above problems, and the technical objective of the present invention is to increase the versatility of drainage pipe joints so that they can be used in buildings ranging from mid-rise to super-high-rise buildings.

The above-mentioned problems are solved by various inventions. The first invention is a drain pipe fitting that is inserted into a penetration in a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors, and to which a horizontal drainage branch pipe on the floor slab is connected. The fitting includes a body for allowing the drainage water to flow downward, an upper receptacle formed at the upper end of the body and connected to the drainage standpipe of the upper floor, a horizontal branch pipe receptacle formed on the upper side of the body and connected to the horizontal drainage branch pipe, and a swivel guide formed on the inner surface of the body below the horizontal branch pipe receptacle to swirl the flowing drainage water. A guide member is configured to be retrofitted below the upper receptacle for swirl- ing the drainage water flowing down from the drainage standpipe of the upper floor and guiding it to the swivel guide on the inner surface of the body. When retrofitted, the guide member is inserted through the upper receptacle and attached to the underside of the upper receptacle.

According to the present invention, a guide member can be retrofitted to the underside of the upper receptacle to swirl the wastewater flowing down from the drainage standpipe on the upper floor and guide it to the swirl guide on the inner circumferential surface of the body. Therefore, by retrofitting the guide member to the underside of the upper receptacle, the wastewater flowing down from the drainage standpipe on the upper floor can be swirled and guided to the swirl guide on the inner circumferential surface of the body. This allows the synergistic effect of the guide member and the swirl guide to strongly swirl the flowing wastewater. In other words, by retrofitting a guide member to a drainage pipe fitting for mid- to high-rise buildings, it can be used as a drainage pipe fitting for super-high-rise buildings. In this way, by retrofitting the guide member or omitting the guide member, the drainage pipe fitting can be used for super-high-rise buildings or mid- to high-rise buildings, thereby increasing the versatility of the drainage pipe fitting.

According to the second invention, the guide member comprises a cylindrical portion with an outer flange portion at its upper end and a swivel guide main body portion fixed to the inside of the cylindrical portion. The guide member is attached to the underside of the upper receptacle by inserting the cylindrical portion into an inner flange portion formed at the lower end of the upper receptacle and overlapping the outer flange portion of the cylindrical portion over the inner flange portion from above. In other words, by overlapping the outer flange portion of the guide member over the inner flange portion at the lower end of the upper receptacle from above, the guide member can be attached to the underside of the upper receptacle, making it easier to attach the guide member to the drain pipe fitting.

According to the third invention, a strip-shaped vertical wall portion is formed on the inside of the cylindrical portion of the induction guide member, protruding radially inward from the cylindrical portion at a fixed width downstream of the downstream end of the swivel guide main body portion. The wastewater swirling as guided by the swivel guide main body portion of the induction guide member and the wastewater flowing down along the vertical wall portion merge together, and the combined wastewater is guided to the swivel guide on the inner circumferential surface of the body portion.

According to the fourth invention, the thickness of the guide member is set to a value smaller than half the thickness of the body. In other words, because the guide member is sufficiently thin compared to the body of the drain pipe fitting, the reduction in the flow path area within the body due to the installation of the guide member can be minimized.

According to the fifth aspect of the present invention, the guide member is made of stainless steel. This makes the guide member less susceptible to corrosion and increases its strength. As a result, even a thin guide member does not reduce its durability against the inner wall of the body.

According to the sixth aspect of the invention, the upper receptacle is provided with a sealant that provides a watertight seal between the upper receptacle and the drainage standpipe on the upper floor, and the guide member is molded integrally with the sealant. This makes it easier to attach the guide member to the underside of the upper receptacle. It also makes it less likely for the guide member to come off the upper receptacle.

According to the seventh invention, there is provided a guide member for use in a drainage pipe joint that is inserted into a penetration portion of a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors, and to which a horizontal drainage branch pipe on the floor slab is connected. The guide member is attached to the underside of the upper receptacle of the drainage pipe joint to which the drainage standpipe of the upper floor is connected, and includes a cylindrical portion with an outer flange portion at its upper end, and a swivel guide main body portion fixed to the inside of the cylindrical portion to swivel the drainage water flowing down from the drainage standpipe of the upper floor. The cylindrical portion is inserted into an inner flange portion formed at the lower end of the upper receptacle, and the outer flange portion of the cylindrical portion is overlapped from above on the inner flange portion, thereby attaching the cylindrical portion and swivel guide main body portion to the underside of the upper receptacle.

According to the eighth invention, a guide member is used in a drainage pipe joint that is inserted into a penetration part of a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors, and to which a horizontal drainage branch pipe on the floor slab is connected. The guide member is attached to the underside of the upper receptacle of the drainage pipe joint to which the drainage standpipe of the upper floor is connected, and is equipped with a swivel guide main body that swivels the wastewater flowing down from the drainage standpipe of the upper floor. The upper receptacle of the drainage pipe joint is equipped with a sealant that provides a watertight seal between the upper receptacle and the drainage standpipe of the upper floor, and the swivel guide main body is molded integrally with the sealant.

This invention increases the versatility of drainage pipe fittings, allowing them to be used in buildings ranging from mid-rise to super-high-rise buildings.

1 is a side view of a drainage system using a drainage pipe joint according to a first embodiment of the present invention. FIG. 1 is a plan view of a drainage pipe joint according to a first embodiment of the present invention. FIG. 3 is a longitudinal cross-sectional view of the drainage pipe joint (a cross-sectional view taken along the arrows III-III in FIG. 2 (as seen from the front)). 4 is a longitudinal cross-sectional view of the auxiliary guide and swivel guide in the body of the drain pipe joint (a cross-sectional view taken along the IV-IV arrow in FIG. 3 (viewed from the left side)). FIG. 4 is a plan view of an induction guide member that is retrofitted to the drainage pipe joint. FIG. 3 is a partially cutaway side view of the induction guide member as seen from the front. FIG. 4 is an exploded side view of the induction guide member. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7 (a vertical cross-sectional view seen from the left side). 10 is a graph showing the pressure distribution inside the pipe when a certain amount of wastewater is flowed into a drainage system using a joint with an induction guide and a drainage system using a joint without an induction guide. FIG. 10 is a partially cutaway perspective view of a seal-cum-guide member according to a first modified example of the present invention. FIG. 10 is a longitudinal cross-sectional view of a drainage pipe joint according to a modified example (2). FIG. 10 is a longitudinal cross-sectional view of a drainage pipe joint according to a modified example (3). FIG. 1 is a longitudinal cross-sectional view of a conventional drainage pipe joint. FIG. 1 is a plan view of a conventional drainage pipe joint.

[Embodiment 1]
A drain pipe fitting according to a first embodiment of the present invention will be described below with reference to Figures 1 to 10. The drain pipe fitting 20 according to this embodiment is a drain pipe fitting used in drainage facilities in mid- to high-rise buildings, such as apartment buildings and office buildings, and in super-high-rise buildings. Here, the front, back, left, right, and up and down shown in the figures correspond to the front, back, left, right, and up and down of the drain pipe fitting.

<Overview of drainage facilities>
As shown in Figure 1, the drainage system includes drainage pipe joints 20 installed on each floor, penetrating the floor slab CS separating the upper and lower floors of the building, drainage standpipes 70 connecting the drainage pipe joints 20 on each floor, and horizontal drainage branch pipes 75, 76 that are installed on the floor of each floor and connected to the drainage pipe joints 20 on each floor. The drainage pipe joints 20 are inserted into through-holes CH in the floor slab CS while covered with fire-resistant and sound-proof covering material 80 (see the two-dot chain line). After the construction of the drainage system is completed, the through-holes CH are backfilled with mortar M, thereby fixing the drainage pipe joints 20 to the floor slab CS.

<Overview of the drainage pipe joint 20>
The drain pipe joint 20 is a joint that joins the drainage water led by the drainage stand pipe 70 on the upper floor and the drainage horizontal branch pipes 75, 76 and allows it to flow down to the drainage stand pipe 70 on the lower floor. The drain pipe joint 20 is a joint made of cast iron and has a cylindrical body 21 for allowing the drainage water to flow down, as shown in Figures 1 and 3.

As shown in FIG. 1, the upper end of the body 21 of the drain pipe fitting 20 is formed with an upper receptacle 22 into which the lower end insertion port 70s of the drain standpipe 70 is inserted. As shown in FIG. 3, the upper receptacle 22 has a cylindrical portion 22e formed in a roughly cylindrical shape and an inner flange portion 22f provided at the lower position of the cylindrical portion 22e. A rubber tubular sealant 32 is housed within the cylindrical portion 22e of the upper receptacle 22, and is placed on the inner flange portion 22f to provide a watertight seal between the lower end insertion port 70s of the drain standpipe 70 and the upper receptacle 22. As shown in FIG. 3, a guide member 50 is supported on the inner flange portion 22f of the upper receptacle 22. As described below, the guide member 50 is a member for rotating wastewater flowing down from the drain standpipe 70 on the upper floor counterclockwise.

As shown in Figures 1 and 3, the body 21 of the drain pipe fitting 20 has an expanded diameter below the inner flange 22f of the upper receptacle 22, forming a large-diameter cylindrical section 23 with a larger inner diameter than the upper receptacle 22. Furthermore, as shown in Figure 2, horizontal branch pipe receptacles 24, into which horizontal drain branch pipes 75, 76 are inserted and connected, are formed circumferentially at 90° intervals on the left and front sides of the upper side of the large-diameter cylindrical section 23 of the body 21. As shown in Figure 3, the horizontal branch pipe receptacles 24 are formed at the boundary between the body 21 and the horizontal branch pipe receptacle 24, against which the upper end surfaces of the horizontal drain branch pipes 75, 76 can abut. Here, a rubber seal (not shown) is housed inside the horizontal branch pipe receptacle 24 to seal between the horizontal drain branch pipes 75, 76 and the horizontal branch pipe receptacle 24, as in the case of the upper receptacle 22. In this embodiment, the horizontal branch pipe receptacles 24 are formed on the front and left sides of the body 21 of the drain pipe fitting 20, but the number and mounting positions of the horizontal branch pipe receptacles 24 can be changed circumferentially as needed.

As shown in Figures 1 and 3, a tapered section 25 is formed below the large-diameter cylindrical section 23 of the body 21 of the drain pipe fitting 20, with the diameter gradually decreasing downward. Furthermore, a cylindrical lower-end insertion section 27 is formed below the tapered section 25 of the body 21. As shown in Figure 1, the large-diameter cylindrical section 23, which is located below the horizontal branch pipe receptacle 24, the tapered section 25, and the upper part of the lower-end insertion section 27 of the body 21 of the drain pipe fitting 20 are housed within the through-hole CH in the floor slab CS. The upper receptacle 70u of the drainage stand pipe 70 on the lower floor is connected to the lower-end insertion section 27 of the body 21, which protrudes downward from the through-hole CH in the floor slab CS.

As shown in Figures 2 to 4 (cross-sectional view taken along the arrows IV-IV in Figure 3), the inner wall surface of the body 21 of the drain pipe fitting 20 is formed with an auxiliary guide 31 and a swirl guide 34 for swirling the flowing wastewater counterclockwise along the inner wall surface of the body 21. As shown in Figures 2 and 3, the swirl guide 34 is a guide blade that receives the wastewater that has been swirled counterclockwise by the induction guide member 50 provided below the upper receiving port 22 and swirls it further. The auxiliary guide 31 is positioned directly below the induction guide member 50 and is a guide blade that receives the wastewater that was not received by the induction guide member 50 and swirls it counterclockwise. As a result, two swirling flows flow along the inner wall surface within the body 21 of the drain pipe fitting 20: a swirling flow created by the induction guide member 50 and the swirl guide 34, and a swirling flow created by the auxiliary guide 31.

<Regarding the Induction Guide Member 50>
The guide member 50 is a component for rotating wastewater flowing down from the drainage standpipe 70 on the upper floor counterclockwise. It is used when modifying the specifications of a drainage pipe fitting 20 for mid- to high-rise buildings for use in ultra-high-rise buildings (buildings over 60 meters tall). The guide member 50 is molded, for example, from epoxy-coated stainless steel (thickness t = 1.2 mm). As shown in Figures 5 to 7, the guide member 50 is composed of a swivel guide main body 52 for rotating wastewater counterclockwise and a cylindrical support member 54 that circumferentially surrounds the swivel guide main body 52. The cylindrical support member 54 attaches the guide member 50 to the lower side of the upper receptacle 22 of the drainage pipe fitting 20 and prevents wastewater flowing down from the drainage standpipe 70 from splashing radially outward within the body 21 and backflowing into the horizontal drainage branch pipes 75 and 76. The cylindrical support portion 54 is composed of a cylindrical portion 54e that is inserted into the inner flange portion 22f of the upper socket 22, and an outer flange portion 54f that is formed at the upper end of the cylindrical portion 54e and placed on the inner flange portion 22f. The outer diameter of the cylindrical portion 54e of the cylindrical support portion 54 is set to a value that is approximately equal to the inner diameter of the inner flange portion 22f of the upper socket 22. The height of the cylindrical support portion 54 (cylindrical portion 54e) is set to be greater than 40 mm to prevent backflow of drainage into the horizontal drain branch pipes 75, 76, and further set to a value that does not protrude below the insertion stopper 24s, as shown in FIG. 3.

As shown in Figure 5, the swivel guide main body 52 is fixed to the front inner peripheral surface of the cylindrical portion 54e of the cylindrical support portion 54. As shown in Figures 5 to 7, the swivel guide main body 52 includes a planar arc-shaped arc vertical wall portion 52e that is superimposed on the inner peripheral surface of the cylindrical portion 54e of the cylindrical support portion 54, and a swivel guide portion 52x that causes the wastewater that flows down to swivel counterclockwise. As shown in Figures 5 and 6, the arc vertical wall portion 52e of the swivel guide main body 52 includes an upstream vertical wall portion 52j formed on the upstream edge in the circumferential direction of the arc vertical wall portion 52e, and an end vertical wall portion 52w formed on the downstream edge in the circumferential direction.

As shown in Figures 6 and 7, the arc-shaped vertical wall portion 52e of the swivel guide main body 52 is composed of a portion that is housed within and overlaps the cylindrical portion 54e of the cylindrical support portion 54, and a portion that protrudes downward from the cylindrical portion 54e. The overlapping portions of the arc-shaped vertical wall portion 52e of the swivel guide main body 52 and the cylindrical portion 54e of the cylindrical support portion 54 are joined together by welding. In other words, the thickness of the overlapping portion between the arc-shaped vertical wall portion 52e of the swivel guide main body 52 and the cylindrical support portion 54 is 1.2 mm x 2 = 2.4 mm.

As shown in Figure 6, the arc-shaped vertical wall portion 52e of the swivel guide main body 52, which protrudes downward from the cylindrical portion 54e of the cylindrical support portion 54, has a side shape (side shape as viewed from the front) that is approximately a right triangle. A swivel guide portion 52x is formed at the lower end of the arc-shaped vertical wall portion 52e of the swivel guide main body 52, corresponding to the hypotenuse of the right triangle, so as to protrude from the arc-shaped vertical wall portion 52e toward the center of the cylindrical support portion 54. As shown in Figures 2 and 5, the swivel guide portion 52x has a planar shape that is approximately a flattened semicircle. The protruding end 52y of the swivel guide portion 52x, which protrudes from the arc-shaped vertical wall portion 52e toward the center of the cylindrical support portion 54, is linear, and this linear protruding end 52y is parallel to the axis of the left horizontal branch pipe receptacle 24 in plan view (see Figure 2). Here, if the drain pipe joint 20 has a nominal diameter of, for example, 100 mm, the dimension from the protruding end 52y of the swivel guide section 52x to the center of the drain pipe joint 20 is set to approximately 20 mm so as not to interfere with the formation of an air core within the body section 21.

As shown in Figure 6 and elsewhere, the swivel guide portion 52x of the swivel guide main body 52 is inclined by an angle θ1 in the circumferential direction relative to the axis (dashed line) of the cylindrical portion 54e (the angle is inclined so that the right side is lower when viewed from the front). Here, angle θ1 is set to, for example, θ1 = 50°. As a result, wastewater flowing down from the drainage standpipe 70 on the upper floor is received by the swivel guide portion 52x of the swivel guide main body 52 and rotates left along the arc-shaped vertical wall portion 52e, as shown in Figure 5. Furthermore, as shown in Figure 8, the swivel guide portion 52x is inclined by an angle θ2 in the radial direction so that the protruding end 52y side is lower than the arc-shaped vertical wall portion 52e side. Here, angle θ2 is set to, for example, θ2 = 25°. This makes it less likely for the flowing wastewater to splash at the swivel guide portion 52x of the swivel guide main body 52. This prevents the air core inside the body 21 of the drain pipe fitting 20 from being closed due to wastewater splashing.

As shown in Figure 5, an upstream vertical wall portion 52j formed on the upstream edge of the arcuate vertical wall portion 52e is located at the upstream end of the swivel guide portion 52x of the swivel guide main body 52. The upstream vertical wall portion 52j is formed in a strip shape and is bent approximately 90 degrees toward the center of the cylindrical support portion 54 relative to the arcuate vertical wall portion 52e. As shown in Figure 6 and other figures, the upstream vertical wall portion 52j is formed to extend vertically from the upper end of the arcuate vertical wall portion 52e of the swivel guide main body 52 to a height position equal to the upstream end of the swivel guide portion 52x. This allows the downstream wastewater to be guided by the upstream vertical wall portion 52j and efficiently directed to the swivel guide portion 52x.

A vertical edge wall portion 52w formed on the downstream edge of the arc-shaped vertical wall portion 52e is located downstream of the downstream end of the swivel guide portion 52x of the swivel guide main body 52. Here, the dimension W (see Figure 8) between the downstream end of the swivel guide portion 52x and the vertical edge wall portion 52w is set to approximately 20 mm when the drain pipe fitting 20 has a nominal diameter of, for example, 100 mm. As shown in Figure 5, the vertical edge wall portion 52w is formed in a strip shape and is bent approximately 90° toward the center of the cylindrical support portion 54 relative to the arc-shaped vertical wall portion 52e. As shown in Figure 6, etc., the vertical edge wall portion 52w is formed to extend vertically from the upper end position of the arc-shaped vertical wall portion 52e of the swivel guide main body 52 to its lower end position, which is at the same height as the downstream end of the swivel guide portion 52x. As a result, the wastewater flowing down along the vertical wall portion 52w at the edge of the swivel guide main body 52 is guided by the swivel guide portion 52x, turns left, and merges with the wastewater that has passed through the swivel guide portion 52x.

The wastewater guided by the swivel guide portion 52x and swirling left merges with the wastewater flowing down along the vertical edge wall portion 52w, and the combined wastewater is guided to the swivel guide 34 formed on the rear inner peripheral surface of the tapered portion 25 of the body portion 21, as shown in Figure 3. If the dimension W between the downstream end of the swivel guide portion 52x and the vertical edge wall portion 52w is set to greater than approximately 20 mm, the combined wastewater will flow more easily in the circumferential direction than below the body portion 21, as described above, and the amount of wastewater guided to the swivel guide 34 will decrease. Furthermore, if the dimension W between the downstream end of the swivel guide portion 52x and the vertical edge wall portion 52w is set to less than approximately 20 mm, the combined wastewater will flow more easily toward the center of the body portion 21, and the amount of wastewater guided to the swivel guide 34 will decrease. Therefore, by setting the dimension W between the downstream end of the swivel guide portion 52x and the vertical edge wall portion 52w to approximately 20 mm, the combined wastewater can be efficiently guided to the swivel guide 34. Here, the vertical edge wall portion 52w may be formed only on the portion of the downstream edge of the arcuate vertical wall portion 52e of the swivel guide main body portion 52 that protrudes downward from the cylindrical portion 54e of the cylindrical support portion 54.

<Regarding the swivel guide 34>
As shown in Fig. 3, the swivel guide 34 is a guide vane that receives the wastewater that has been swung left by the swivel guide main body 52 of the induction guide member 50 and causes it to further swivel left. The swivel guide 34 is formed at the tapered portion 25 of the body 21, at a position rotated 180° from the swivel guide main body 52 of the induction guide member 50 (a position facing the body in a plan view), as shown in Fig. 2 etc. The swivel guide 34 is formed integrally with the body 21 of the drain pipe fitting 20 when the body 21 is cast, as shown in Fig. 4. The wall thickness of the body 21 is set to approximately 5 mm.

As shown in Figure 2, the swivel guide 34 has a generally flattened semicircular planar shape that extends from the inner circumferential surface of the tapered portion 25 of the body portion 21 toward the center of the body portion 21. The swivel guide 34 has a linear extension end 34y that extends from the inner circumferential surface of the tapered portion 25 toward the center of the body portion 21, and this linear extension end 34y is parallel to the axis of the left-side horizontal branch pipe receptacle 24 in a plan view. Here, if the drain pipe fitting 20 has a nominal diameter of, for example, 100 mm, the distance from the extension end 34y of the swivel guide 34 to the center of the drain pipe fitting 20 is set to approximately 40 mm so as not to interfere with the formation of an air core within the body portion 21.

As shown in Figure 3, the swivel guide 34 is inclined at an angle β in the circumferential direction with respect to the axis (dashed line) of the body 21 (inclined so that the left side is lower when viewed from the front). Here, the angle β is set to, for example, β = 30°. As a result, the wastewater guided by the swivel guide main body 52 of the induction guide member 50 is received by the swivel guide 34 as shown in Figure 3, and the synergistic effect of the induction guide member 50 and the swivel guide 34 causes the flowing wastewater to make a strong left-handed rotation.

<About the auxiliary guide 31>
As shown in Figure 2 (see dotted line), the auxiliary guide 31 is a guide vane that is positioned directly below the induction guide member 50 and receives drainage water that was not received by the induction guide member 50 and causes it to turn left. The auxiliary guide 31 is formed from the lower part of the large-diameter cylindrical portion 23 of the body portion 21 to the upper part of the tapered portion 25, as shown by the two-dot chain line in Figure 3. The auxiliary guide 31 is formed integrally with the body portion 21 when the body portion 21 of the drain pipe fitting 20 is cast, as shown in Figure 4. Like the swivel guide portion 52x of the induction guide member 50, the auxiliary guide 31 is formed in a generally flattened semicircular shape in plan view so as to protrude from the inner circumferential surface of the body portion 21 toward the center of the body portion 21, as shown in Figure 2. The auxiliary guide 31 has a linear projection 31y that projects from the inner peripheral surface of the body 21 toward the center of the body 21, and the linear projection 31y is parallel to the axis of the left-side horizontal branch pipe socket 24 in a plan view. Here, if the drain pipe joint 20 has a nominal diameter of 100 mm, for example, the dimension from the projection 31y of the auxiliary guide 31 to the center of the drain pipe joint 20 is set to approximately 20 mm so as not to interfere with the formation of an air core within the body 21.

As shown in Figure 3, the auxiliary guide 31 is inclined circumferentially by an angle α with respect to the axis (dashed line) of the body 21 (inclined so that the right side is lower when viewed from the front). Here, the angle α is set, for example, to α = 50° = θ1. As a result, wastewater that is not received by the swiveling guide main body 52 of the guiding member 50 and flows down along the inner surface of the body 21, such as wastewater flowing in from the horizontal drainage branch pipes 75 and 76, is received by the auxiliary guide 31 and rotated left, as shown in Figure 3.

<Handling of drainage pipe joint 20>
When the drain pipe fitting 20 is used in a super-high-rise building (a building over 60 meters tall), the guide member 50 is set on the drain pipe fitting 20. Specifically, the swivel guide main body 52 (swivel guide portion 52x) of the guide member 50 is positioned so that it overlaps the auxiliary guide 31 of the body 21 of the drain pipe fitting 20 in plan view and is rotated 180° relative to the swivel guide 34, as shown in FIG. 2 . In this state, the cylindrical portion 54e of the cylindrical support portion 54 of the guide member 50 is passed through the inner flange portion 22f of the upper socket 22 of the drain pipe fitting 20. Then, when the outer flange portion 54f of the cylindrical support portion 54 of the guide member 50 is placed on the inner flange portion 22f of the upper socket 22, the outer flange portion 54f and the inner flange portion 22f are bonded together with a rubber adhesive. This completes the setting of the guide member 50 on the drain pipe fitting 20. In this state, the cylindrical seal material 32 is set into the upper socket 22 of the drain pipe joint 20.

By setting the guide member 50 to the drain pipe fitting 20 in this way, the wastewater flowing down from the drainage standpipe 70 on the upper floor is received by the swivel guide portion 52x of the guide member 50 (swivel guide main body portion 52) and rotates left along the arc-shaped vertical wall portion 52e, as shown in Figure 5. Furthermore, the wastewater flowing down along the edge vertical wall portion 52w of the guide member 50 (swivel guide main body portion 52) merges with the wastewater that has passed through the swivel guide portion 52x. As a result, the combined wastewater is guided to the swivel guide 34 formed on the rear inner surface of the tapered portion 25 of the body portion 21 and further rotates left by the swivel guide 34. In other words, the synergistic effect of the guide member 50 and the swivel guide 34 causes the flowing wastewater to strongly rotate left.

In addition, wastewater that is not received by the swivel guide main body 52 of the guiding guide member 50 and flows down along the inner surface of the body 21, such as wastewater flowing in from the horizontal drainage branch pipes 75 and 76, is received by the auxiliary guide 31 and swirled to the left, as shown in Figure 3. In this way, two swirling flows flow along the inner wall surface within the body 21 of the drainage pipe fitting 20: one swirling flow caused by the guiding guide member 50 and swirl guide 34, and one swirling flow caused by the auxiliary guide 31. Therefore, even when the drainage pipe fitting 20 is used in a super-high-rise building, an air core can be well formed within the body 21 of the drainage pipe fitting 20, ensuring drainage performance.

When the drain pipe fitting 20 is used for mid- to high-rise buildings, it is used without the induction guide member 50 attached. This allows the wastewater flowing down the inner surface of the body 21 of the drain pipe fitting 20 to be received by the front auxiliary guide 31 and the rear swivel guide 34 and swirled to the left. This allows two swirling flows to flow along the inner wall surface within the body 21 of the drain pipe fitting 20, caused by the auxiliary guide 31 and the swivel guide 34. This allows an excellent air core to be formed within the body 21 of the drain pipe fitting 20, ensuring drainage performance suitable for mid- to high-rise buildings.

Figure 9 shows a graph of the pressure distribution inside the pipes when drain pipe fittings 20 (fittings with guides) equipped with guide members 50 and drain pipe fittings 20 (fittings without guides) without guide members 50 are installed on each floor of a drainage test facility (test tower) and drainage is actually flowing. The horizontal axis of the graph represents the pressure inside the pipes (Pa), and the vertical axis represents the number of floors of the test tower, which simulates a building. Here, both the fittings with guides and the fittings without guides have a nominal diameter of 100 mm, and a fixed amount of drainage (6.5 L/sec) is flowing through both. Pressure gauges are installed in fixed positions inside the horizontal drainage branch pipes 75 connected to the drain pipe fittings 20 on each floor. Furthermore, pressure measurements on each floor (1F to 5F) are performed by continuously measuring the pressure inside the pipes for a fixed period of time while drainage is flowing.

In the graph in Figure 9, the white circles and solid line represent the minimum internal pipe pressure when a guided fitting is used, while the black circles and solid line represent the maximum internal pipe pressure when a guided fitting is used. Furthermore, the white circles and dotted line represent the minimum internal pipe pressure when a non-guide fitting is used, while the black circles and dotted line represent the maximum internal pipe pressure when a non-guide fitting is used. For example, on the fifth floor, when a guided fitting is used, the internal pipe pressure varies between approximately -200 Pa and approximately 20 Pa. In contrast, when a non-guide fitting is used, the internal pipe pressure varies between approximately -320 Pa and approximately 10 Pa. This is thought to be because, with guided fittings, the strong swirling flow effectively creates an air core within the pipe, thereby minimizing negative pressure. Furthermore, the swirling flow and air core facilitate the flow of wastewater through the pipe, minimizing the increase in maximum pressure.

As with the fifth floor, even from the fourth floor to the first floor, when using a guided fitting, negative pressure can be kept lower than when using a fitting without a guided fitting. Furthermore, when using a guided fitting, positive pressure can be kept lower than when using a fitting without a guided fitting. Particularly on lower floors, the discharged water is forced to suddenly change direction, which can easily cause a hydraulic jump (the discharged water jumps and blocks the air's escape route), resulting in a tendency for positive pressure. However, when using a guided fitting, the swirling flow and air core make it easier for the discharged water to flow through the pipe, and positive pressure can be kept lower than when using a fitting without a guided fitting.

<Advantages of the drain pipe joint 20 according to this embodiment>
According to the drain pipe fitting 20 of this embodiment, a guide member 50 can be retrofitted below the upper receptacle 22 to swirl wastewater flowing down from the drain standpipe 70 on the upper floor and guide it to the swivel guide 34 on the inner circumferential surface of the body 21. Therefore, by retrofitting the guide member 50 below the upper receptacle 22, the wastewater flowing down from the drain standpipe 70 on the upper floor can be swirled and guided to the swivel guide 34 on the inner circumferential surface of the body 21. This allows the synergistic effect of the guide member 50 and the swivel guide 34 to strongly swirl the flowing wastewater. In other words, retrofitting the guide member 50 to a drain pipe fitting 20 for mid- to high-rise buildings allows it to be used as a drain pipe fitting 20 for super-high-rise buildings. By retrofitting the guide member 50 or omitting the guide member 50, the drain pipe fitting 20 can be used for super-high-rise buildings or mid- to high-rise buildings, thereby increasing the versatility of the drain pipe fitting 20.

Furthermore, by overlapping the outer flange portion 54f of the guide member 50 with the inner flange portion 22f at the lower end of the upper receptacle 22 from above, the guide member 50 can be attached to the underside of the upper receptacle 22, making it easy to attach the guide member 50 to the drain pipe fitting 20. Furthermore, the thickness of the guide member 50 (maximum 1.2 mm x 2) is thinner than the thickness of the body 21 (approximately 5 mm), minimizing the reduction in flow path area within the body 21 due to the attachment of the guide member 50. Furthermore, because the guide member 50 is made of stainless steel, it is resistant to corrosion and has high strength. As a result, even a thin guide member 50 does not reduce durability against the inner wall of the body 21.

<Modification 1>
The present invention is not limited to the above embodiment, and modifications are possible within the scope of the present invention. For example, in this embodiment, as shown in Fig. 3, the outer flange portion 54f of the guide member 50 is overlapped from above with the inner flange portion 22f at the lower end of the upper receptacle 22, thereby attaching the guide member 50 to the lower side of the upper receptacle 22. However, as shown in Fig. 10, it is also possible to use a seal-cum-guide member 320 in which the guide member 50 and the tubular seal material 32 housed in the upper receptacle 22 are integrally molded.

<Regarding the sealing and guide member 320>
The seal/guide member 320 is made of rubber and comprises a tubular seal portion 321 and a drainage guide portion 354. The tubular seal portion 321 has the same configuration as the tubular seal member 32. That is, the tubular seal portion 321 comprises a covering cylindrical portion 324 that covers the inner circumferential surface of the upper receptacle 22, a pleated seal body portion 322 provided on the upper inner circumferential side of the covering cylindrical portion 324, and a lower flange portion 324f with a U-shaped cross section formed at the lower end position of the covering cylindrical portion 324. The lower flange portion 324f of the tubular seal portion 321 rests on the inner flange portion 22f of the upper receptacle 22.

A cylindrical portion 354e of the drainage guide portion 354, which is inserted into the inner flange portion 22f of the upper receptacle 22, is provided below the lower end flange portion 324f of the tubular seal portion 321. A swivel guide main body 352 is provided below the cylindrical portion 354e of the drainage guide portion 354. The swivel guide main body 352 has the same configuration as the swivel guide main body 52 of the induction guide member 50. The swivel guide main body 352 includes an arc-shaped vertical wall portion 352e provided on the lower extension of the cylindrical portion 354e, and a swivel guide portion 352x that rotates the downstream drainage water counterclockwise. Stainless steel 355 is inserted into the swivel guide portion 352x. A vertical edge wall portion 352w is formed on the edge of the arc-shaped vertical wall portion 352e located downstream of the swivel guide portion 352x. In this way, by using the seal/guide member 320, which integrates the cylindrical seal material 32 and the guide member 50, it is possible to prevent the guide member 50 from falling over time. It also makes it easier to attach the seal/guide member 320 to the drain pipe joint 20.

In addition, while this embodiment shows an example in which the guide member 50 or the seal/guide member 320 is attached to a cast iron drain pipe fitting 20, it is also possible to attach the guide member 50 or the seal/guide member 320 to a resin drain pipe fitting, for example. Furthermore, this embodiment shows an example in which the guide member 50 is attached to a drain pipe fitting 20 that has an auxiliary guide 31 and a swivel guide 34 on the inner surface of the body 21, but by attaching the guide member 50 to a drain pipe fitting that only has a swivel guide 34, the drain pipe fitting can be used in high-rise buildings.

<Modifications 2 and 3>
In this embodiment, the drain pipe fitting 20 is used in a super-high-rise building by attaching the guide member 50 to a drain pipe fitting 20 for mid- to high-rise buildings, i.e., a drain pipe fitting 20 having a swivel guide 34 and an auxiliary guide 31 within the body 21. However, as shown in FIG. 11 , the guide member 50 can also be attached to a drain pipe fitting 60 without a swivel guide, such as a drain pipe fitting that can join drainage water from the lowest floor of a building. That is, the guide member 50 is inserted through the upper receptacle 62 of the drain pipe fitting 60 and set on the inner flange portion 62f of the upper receptacle 62. This further amplifies the swirling flow of drainage water flowing down from upper floors within the drain pipe fitting 60, thereby improving the drainage performance of the drain pipe fitting 60. Furthermore, as shown in FIG. 12 , the guide member 50 can also be attached to a conventional drain pipe fitting (MD fitting) 65 without a swivel guide.

20...Drainage pipe joint 21...Body portion 22...Upper socket 22f...Inner flange portion 24...Horizontal branch pipe socket 31...Auxiliary guide 32...Cylindrical sealing material (sealing material)
34: Swivel guide 50: Induction guide member 52: Swivel guide main body 52w: Edge vertical wall portion (vertical wall portion)
54...Cylindrical support portion 54e...Cylindrical portion 54f...Outer flange portion 60...Drainage pipe joint 65...Three-way drainage pipe joint 70...Drainage stand pipe 75...Drainage horizontal branch pipe 76...Drainage horizontal branch pipe 320...Seal and guide member CS...Floor slab

Claims (7)

A drainage pipe joint that is inserted into a penetration part of a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors, and to which a drainage horizontal branch pipe on the floor slab is connected,
a body portion for allowing wastewater to flow downward;
an upper receiving port formed at an upper end position of the body portion and to which a drainage standpipe of the upper floor is connected;
a horizontal branch pipe receiving port formed on an upper side surface of the body portion and to which the horizontal drainage branch pipe is connected;
a swirl guide formed on an inner circumferential surface of the body portion located below the horizontal branch pipe receiving port, for swirling the drainage water flowing down;
It is equipped with
A guide member is configured to be retrofittable below the upper receiving port to rotate the drainage water flowing down from the drainage standpipe of the upper floor and guide it to the rotating guide on the inner peripheral surface of the body portion,
When the induction guide member is retrofitted, it is inserted through the upper receptacle and attached to the lower side of the upper receptacle ,
The induction guide member includes a cylindrical portion having an outer flange portion at an upper end thereof, and a swivel guide main body portion fixed to the inside of the cylindrical portion,
The guide member is a drainage pipe fitting that is attached to the underside of the upper receiving port by inserting the cylindrical portion into the inner flange portion formed at the lower end of the upper receiving port and overlapping the outer flange portion of the cylindrical portion from above on the inner flange portion . 2. The drain pipe joint according to claim 1,
a strip-shaped vertical wall portion that protrudes radially inward of the cylindrical portion with a constant width at a position downstream of the downstream end of the turning guide main body portion on the inside of the cylindrical portion of the induction guide member,
A drainage pipe fitting in which drainage water that is guided and rotated by the swivel guide main body portion of the induction guide member and drainage water that flows down along the vertical wall portion merge together, and the merged drainage water is guided to the swivel guide on the inner surface of the body portion. A drain pipe joint according to any one of claims 1 to 2,
A drain pipe joint in which the thickness dimension of the induction guide member is set to a value smaller than half the thickness dimension of the body portion. 4. The drain pipe joint according to claim 3,
The drainage pipe joint, wherein the induction guide member is made of stainless steel. A drainage pipe joint that is inserted into a penetration part of a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors, and to which a drainage horizontal branch pipe on the floor slab is connected,
a body portion for allowing wastewater to flow downward;
an upper receiving port formed at an upper end position of the body portion and to which a drainage standpipe of the upper floor is connected;
a horizontal branch pipe receiving port formed on an upper side surface of the body portion and to which the horizontal drainage branch pipe is connected;
a swirl guide formed on an inner circumferential surface of the body portion located below the horizontal branch pipe receiving port, for swirling the drainage water flowing down;
It is equipped with
A guide member is configured to be retrofittable below the upper receiving port to rotate the drainage water flowing down from the drainage standpipe of the upper floor and guide it to the rotating guide on the inner peripheral surface of the body portion,
When the induction guide member is retrofitted, it is inserted through the upper receptacle and attached to the lower side of the upper receptacle ,
The upper receiving port is provided with a sealant that provides a watertight seal between the upper receiving port and the drainage standpipe of the upper floor,
The drainage pipe joint, wherein the guide member is integrally molded with the sealing material . A guide member used in a drainage pipe joint that is inserted into a penetration part of a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors and to which a drainage horizontal branch pipe on the floor slab is connected,
a cylindrical portion having an outer flange portion at an upper end thereof, the cylindrical portion being attached to the lower side of the upper receiving port to which the drainage standpipe of the upper floor is connected in the drainage pipe joint;
a swivel guide main body portion fixed to the inside of the cylindrical portion and swirling the drainage water flowing down from the drainage standpipe of the upper floor;
It is equipped with
the cylindrical portion is inserted into an inner flange portion formed at the lower end of the upper receiving port, and the outer flange portion of the cylindrical portion is overlapped with the inner flange portion from above, thereby attaching the cylindrical portion and the swivel guide main body portion to the lower side of the upper receiving port ,
a strip-shaped vertical wall portion having a constant width and protruding radially inward from the cylindrical portion is formed on the inside of the cylindrical portion at a position downstream of the downstream end of the turning guide main body portion,
An induction guide member in which wastewater that is guided and rotated by the swivel guide main body portion and wastewater that flows down along the vertical wall portion merge together, and the merged wastewater is guided to a swivel guide formed on the inner surface of the body of the drain pipe fitting . A guide member used in a drainage pipe joint that is inserted into a penetration part of a floor slab separating the upper and lower floors of a building to connect the drainage standpipes between the upper and lower floors and to which a drainage horizontal branch pipe on the floor slab is connected,
The drain pipe joint is configured to be attached to the underside of the upper receiving port to which the drainage standpipe of the upper floor is connected, and is provided with a swivel guide main body that swivels the drainage flowing down from the drainage standpipe of the upper floor,
The upper socket of the drain pipe joint is provided with a sealant that provides a watertight seal between the upper socket and the drainage standpipe of the upper floor,
The turning guide body is a guide member that is integrally formed with the sealing material.