Drainage pipe joint and guide member used in drainage pipe joint

Abstract

To increase the versatility of a drain pipe joint so that the drain pipe joint can be used in middle-rise, high-rise, and other buildings as well as in super high-rise buildings.SOLUTION: A drain pipe joint that is inserted through a penetration part of a floor slab to connect drain vertical pipes between the upper and lower floors, and to which a horizontal drain branch pipe is connected comprises a trunk part 21, an upper receptacle 22 formed at the upper end position of the trunk part 21, a transverse branch pipe receptacle 24 formed on the upper side of the trunk part 21, and a swirl guide 34 that is formed on the inner peripheral surface of the trunk part 21 located below the transverse branch pipe receptacle 24 and that swirls the waste water flowing down. On the lower side of the upper receptacle 22 is a guide member 50 for swirling the wastewater flowing down from the vertical pipes and guiding it to the swirl guide 34 on the inner peripheral surface of the trunk part 21 configured to be retrofittable. The guide member 50 is inserted from the upper receptacle 22 and attached to the lower side of the upper receptacle 22 when retrofitted.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to 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 vertical pipes between the upper and lower floors, and to which a horizontal drainage branch pipe on the floor slab is connected, and to a guide member used in the drainage pipe joint. [Background technology]

[0002] Patent Document 1 describes a drain pipe fitting used in a building's drainage system. The drain pipe fitting 100 described in Patent Document 1 includes a body 120 through which drainage water flows down, as shown in Fig. 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) of an upper floor is connected, and a lower end connection portion 124 at its lower end to which a drainage standpipe (not shown) of a lower floor is connected. In addition, as shown in Figs. 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 receiving port 126, with a phase shift of 180° to rotate the drainage water flowing down within the body 120. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-119960 Summary of the Invention [Problem to be solved by the invention]

[0004] In the drain pipe fitting 100, the first swirl guide 128 and the second swirl guide 129 swirl the flowing wastewater, 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 often designed to increase the vertical dimension of the body and the number of swirl guides to further swirl the flowing wastewater. 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.

[0005] The present invention has been made to solve the above problems, and the technical object 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 buildings to super-high-rise buildings. [Means for solving the problem]

[0006] The above-mentioned problems are solved by the following inventions. The first invention is a drain 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 of the upper and lower floors and to which a horizontal drainage branch pipe on the floor slab is connected, the drain pipe joint having a body for allowing the drainage water to flow downward, an upper receptacle formed at the upper end of the body and to which the drainage standpipe of the upper floor is connected, a horizontal branch pipe receptacle formed on the upper side of the body and to which the horizontal drainage branch pipe is connected, and a swirl guide formed on the inner peripheral surface of the body located below the horizontal branch pipe receptacle for circling the flowing downflowing drainage water, and a guide member that can be retrofitted below the upper receptacle for circling the drainage water flowing down from the drainage standpipe of the upper floor and guiding it to the swirl guide on the inner peripheral surface of the body, and the guide member is inserted through the upper receptacle and attached to the underside of the upper receptacle when retrofitted.

[0007] 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, retrofitting a guide member to a drainage pipe fitting for mid- to high-rise buildings allows it to be used as a drainage pipe fitting for super-high-rise buildings. 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.

[0008] According to a second aspect of the present invention, the guide member includes a cylindrical portion having an outer flange portion at its upper end and a swivel guide main body portion fixed to the inside of the cylindrical portion, and 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 easy to attach the guide member to the drainage pipe joint.

[0009] According to the third invention, a strip-shaped vertical wall portion is formed inside the cylindrical portion of the induction guide member, protruding radially inward of the cylindrical portion with a constant width at a position downstream of the downstream end of the swivel guide main body portion, and the wastewater that is guided and swivels 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 merged wastewater is guided to the swivel guide on the inner surface of the body portion.

[0010] According to the fourth aspect of the present 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 joint, it is possible to minimize the reduction in the flow path area within the body due to the installation of the guide member.

[0011] 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 decrease its durability against the inner wall of the body.

[0012] According to the sixth aspect of the present 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 easy to attach the guide member to the underside of the upper receptacle. It also makes it difficult for the guide member to come off the upper receptacle.

[0013] According to the seventh invention, there is provided a guide member used 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 configured to be attached to the underside of the upper receiving port of the drainage pipe joint to which the drainage standpipe of the upper floor is connected, and comprises a cylindrical portion with an outer flange portion at its upper end, and a swivel guide main body portion that is fixed to the inside of the cylindrical portion and swivels 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 receiving port, and the outer flange portion of the cylindrical portion is overlapped from above on the inner flange portion, so that the cylindrical portion and the swivel guide main body portion are attached to the underside of the upper receiving port.

[0014] According to the eighth invention, there is provided 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 vertical pipes between the upper and lower floors, and to which a horizontal drainage branch pipe on the floor slab is connected, the guide member being attached to the underside of the upper receiving port of the drainage pipe joint to which the drainage vertical pipe of the upper floor is connected, and having a swivel guide main body that swivels the drainage flowing down from the drainage vertical pipe of the upper floor, the upper receiving port of the drainage pipe joint being provided with a sealing material that seals the space between the upper receiving port and the drainage vertical pipe of the upper floor in a watertight manner, and the swivel guide main body being integrally molded with the sealing material. [Effects of the Invention]

[0015] According to the present invention, the versatility of the drainage pipe joint is increased, and the drainage pipe joint can be used in buildings ranging from mid-rise buildings to super-high-rise buildings. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a side view of a drainage system using a drainage pipe joint according to a first embodiment of the present invention. [Figure 2] 1 is a plan view of a drainage pipe joint according to a first embodiment of the present invention. [Figure 3] 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)). [Figure 4] 4 is a vertical cross-sectional view of an auxiliary guide and a swivel guide in the body of the drainage pipe joint (a cross-sectional view taken along the arrows IV-IV in FIG. 3 (as seen from the left side)). [Figure 5] FIG. 4 is a plan view of an induction guide member that is retrofitted to the drainage pipe joint. [Figure 6] FIG. 3 is a partially cutaway side view of the induction guide member as seen from the front. [Figure 7] FIG. 4 is an exploded side view of the induction guide member. [Figure 8] 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). [Figure 9]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. [Figure 10] FIG. 10 is a partially cutaway perspective view of a seal-cum-guide member according to a first modified example of the present invention. [Figure 11] FIG. 10 is a vertical cross-sectional view of a drainage pipe joint according to a modified example (2). [Figure 12] FIG. 10 is a vertical cross-sectional view of a drainage pipe joint according to a modified example (3). [Figure 13] FIG. 1 is a longitudinal cross-sectional view of a conventional drainage pipe joint. [Figure 14] FIG. 1 is a plan view of a conventional drainage pipe joint. DETAILED DESCRIPTION OF THE INVENTION

[0017] [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.

[0018] <Outline of drainage facilities> As shown in Figure 1, the drainage equipment includes drainage pipe joints 20 installed on each floor, penetrating the floor slab CS that separates the upper and lower floors of the building, drainage standpipes 70 that interconnect the drainage pipe joints 20 on each floor, and drainage horizontal 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 equipment is completed, the through-holes CH are backfilled with mortar M, thereby fixing the drainage pipe joints 20 to the floor slab CS.

[0019] <Overview of Drainage Pipe Fitting 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, 3, etc.

[0020] As shown in FIG. 1, an upper receptacle 22 is formed at the upper end of the body 21 of the drain pipe fitting 20, into which the lower end insertion port 70s of the drainage standpipe 70 is inserted and connected. As shown in FIG. 3, the upper receptacle 22 has a cylindrical portion 22e formed in a substantially cylindrical shape and an inner flange portion 22f provided at the lower position of the cylindrical portion 22e. A rubber tubular sealant 32 is placed on the inner flange portion 22f within the cylindrical portion 22e of the upper receptacle 22, providing a watertight seal between the lower end insertion port 70s of the drainage 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. The guide member 50 is a member for rotating wastewater flowing down from the drainage standpipe 70 on the upper floor counterclockwise, as described below.

[0021] 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 socket 22, forming a large-diameter cylindrical section 23 with an inner diameter larger than that of the upper socket 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 at 90° intervals in the circumferential direction on the left and front sides of the upper side surface 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, with insertion stoppers 24s 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, just like the upper socket 22. In this embodiment, an example is shown in which horizontal branch pipe receiving ports 24 are formed on the front and left sides of the body 21 of the drain pipe fitting 20, but the number of horizontal branch pipe receiving ports 24 and their installation positions can be changed circumferentially as appropriate.

[0022] 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 drainage pipe fitting 20, with the diameter gradually decreasing downward. Furthermore, a cylindrical lower-end insertion portion 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 socket 24, the tapered section 25, and the upper part of the lower-end insertion portion 27 of the body 21 of the drainage 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 portion 27 of the body 21, which protrudes downward from the through-hole CH in the floor slab CS.

[0023] As shown in Figures 2 to 4 (cross-sectional view taken along the arrows IV-IV in Figure 3), an auxiliary guide 31 and a swirl guide 34 are formed on the inner wall surface of the body 21 of the drain pipe fitting 20 to cause the flowing wastewater to swirl left 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 left by the induction guide member 50 provided below the upper receiving port 22 and causes it to swirl 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 causes it to swirl left. Therefore, within the body 21 of the drain pipe fitting 20, two swirl flows flow along the inner wall surface: a swirl flow caused by the induction guide member 50 and the swirl guide 34, and a swirl flow caused by the auxiliary guide 31.

[0024] <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, and 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 resin-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 part 54 that circumferentially covers the swivel guide main body 52. ​​The cylindrical support part 54 is a component that 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 part 21 and from flowing back into the horizontal drainage branch pipes 75, 76. Cylindrical support portion 54 is composed of a cylindrical portion 54e that is inserted into inner flange portion 22f of upper socket 22, and an outer flange portion 54f that is formed at the upper end of cylindrical portion 54e and placed on inner flange portion 22f. Here, the outer diameter of cylindrical portion 54e of cylindrical support portion 54 is set to a value that is approximately equal to the inner diameter of inner flange portion 22f of upper socket 22. Furthermore, the height of cylindrical support portion 54 (cylindrical portion 54e) is set to be greater than 40 mm from the perspective of preventing backflow of drainage into horizontal drain branch pipes 75, 76, and further set to a value that does not protrude below insertion stopper 24s, as shown in FIG. 3.

[0025] As shown in Fig. 5, the swivel guide main body 52 is fixed to the front inner circumferential surface of the cylindrical portion 54e of the cylindrical support portion 54. As shown in Figs. 5 to 7, the swivel guide main body 52 includes an arc-shaped vertical wall portion 52e having a planar arc shape that is superimposed on the inner circumferential 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 Figs. 5 and 6, the arc-shaped 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-shaped vertical wall portion 52e, and an end vertical wall portion 52w formed on the downstream edge in the circumferential direction.

[0026] 6 and 7, the arcuate vertical wall portion 52e of the swivel guide main body 52 is composed of a portion that is housed in 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 portion of the arcuate 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. That is, the thickness of the overlapping portion of the arcuate vertical wall portion 52e of the swivel guide main body 52 and the cylindrical support portion 54 is 1.2 mm × 2 = 2.4 mm.

[0027] As shown in Fig. 6, the arcuate 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 viewed from the front) that is substantially a right-angled triangle. A swivel guide portion 52x is formed at the lower end position of the arcuate vertical wall portion 52e of the swivel guide main body 52, which corresponds to the hypotenuse of the right-angled triangle, so as to protrude from the arcuate vertical wall portion 52e toward the center of the cylindrical support portion 54. As shown in Figs. 2 and 5, the swivel guide portion 52x has a substantially flattened semicircular planar shape. A protruding end 52y of the swivel guide portion 52x protrudes from the arcuate vertical wall portion 52e toward the center of the cylindrical support portion 54 and is formed linearly, so that the linear protruding end 52y is parallel to the axis of the left horizontal branch pipe receptacle 24 in plan view (see Fig. 2). Here, if the drain pipe fitting 20 has a nominal diameter of, for example, 100 mm, the dimension from the protruding end 52y of the swivel guide portion 52x to the center of the drain pipe fitting 20 is set to approximately 20 mm so as not to interfere with the formation of an air core within the body portion 21.

[0028] As shown in FIG. 6 and other figures, the swivel guide portion 52x of the swivel guide main body 52 is inclined by an angle θ1 in the circumferential direction with respect 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 side). Here, the angle θ1 is set to, for example, θ1 = 50°. As a result, wastewater flowing down from the drainage stand pipe 70 on the upper floor is received by the swivel guide portion 52x of the swivel guide main body 52 and turns left along the arc-shaped vertical wall portion 52e, as shown in FIG. 5. Furthermore, as shown in FIG. 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, the angle θ2 is set to, for example, θ2 = 25°. This makes it difficult for the flowing wastewater to splash at the position of the swivel guide portion 52x of the swivel guide main body 52. This prevents the air core in the body 21 of the drain pipe joint 20 from being closed due to the drainage water splashing.

[0029] As shown in Fig. 5, an upstream vertical wall portion 52j formed on the upstream edge of the arcuate vertical wall portion 52e is disposed 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° relative to the arcuate vertical wall portion 52e toward the center of the cylindrical support portion 54. As shown in Fig. 6 and other figures, the upstream vertical wall portion 52j is formed to extend in the vertical direction from the upper end position 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 led to the swivel guide portion 52x.

[0030] A vertical edge wall portion 52w formed on the downstream edge of the arc-shaped vertical wall portion 52e is disposed downstream of the downstream end of the swivel guide portion 52x of the swivel guide main body 52. ​​Here, the dimension W (see FIG. 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 joint 20 has a nominal diameter of, for example, 100 mm. As shown in FIG. 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 FIG. 6 and other figures, 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 a lower end position that is at the same height as the downstream end of the swivel guide portion 52x. Therefore, the wastewater flowing down along the end edge vertical wall portion 52w of the swivel guide main body portion 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.

[0031] Then, the wastewater guided by the swivel guide portion 52x and swiveling left and the wastewater flowing down along the vertical edge wall portion 52w join together, and the joined wastewater is guided to the swivel guide 34 formed on the rear inner circumferential surface of the tapered portion 25 of the body 21, as shown in Fig. 3. Here, if the dimension W between the downstream end of the swivel guide portion 52x and the vertical edge wall portion 52w is made larger than approximately 20 mm, the joined wastewater flows more easily in the circumferential direction than below the body 21, as described above, and the amount of wastewater guided to the swivel guide 34 decreases. On the other hand, if the dimension W between the downstream end of the swivel guide portion 52x and the vertical edge wall portion 52w is made smaller than approximately 20 mm, the joined wastewater flows more easily toward the center of the body 21, and the amount of wastewater guided to the swivel guide 34 decreases. 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 that protrudes downward from the cylindrical portion 54e of the cylindrical support portion 54 at the downstream edge of the arcuate vertical wall portion 52e of the swivel guide main body portion 52.

[0032] <About the turning 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.

[0033] 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 the linear extension end 34y is parallel to the axis of the left-side horizontal branch pipe socket 24 in a plan view. Here, if the drain pipe fitting 20 has a nominal diameter of, for example, 100 mm, the dimension 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.

[0034] As shown in Fig. 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 (the angle is 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 leading / leading guide member 50 is received by the swivel guide 34 as shown in Fig. 3, and the synergistic effect of the leading / leading guide member 50 and the swivel guide 34 causes the flowing wastewater to make a strong leftward turn.

[0035] <About Supplementary Guide 31> As shown in FIG. 2 (see dotted line), the auxiliary guide 31 is a guide vane that is arranged directly below the induction guide member 50 and receives the wastewater that the induction guide member 50 could not receive 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 FIG. 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 FIG. 4. Like the swivel guide portion 52x of the induction guide member 50, the auxiliary guide 31 is formed in a substantially flattened semicircular shape in plan view so as to protrude from the inner peripheral surface of the body portion 21 toward the center of the body portion 21, as shown in FIG. 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 fitting 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 fitting 20 is set to approximately 20 mm so as not to interfere with the formation of an air core within the body 21.

[0036] As shown in Fig. 3, the auxiliary guide 31 is inclined at an angle α in the circumferential direction 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 to, for example, α = 50° = θ1. As a result, wastewater that is not received by the swivel guide main body 52 of the guiding member 50 and flows down along the inner circumferential 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 Fig. 3.

[0037] <Handling of drainage pipe fitting 20> When the drainage pipe fitting 20 is used in a super-high-rise building (a building over 60 meters tall), the guide member 50 is set to the drainage pipe fitting 20. That is, 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 drainage 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 drainage 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-based adhesive. This completes the setting of the guide member 50 to the drainage pipe fitting 20. In this state, the cylindrical seal material 32 is set into the upper socket 22 of the drain pipe joint 20.

[0038] By setting the guide member 50 to the drain pipe joint 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 (the swivel guide main body portion 52) and turns left along the arc-shaped vertical wall portion 52e, as shown in FIG. 5 . Furthermore, the wastewater flowing down along the edge vertical wall portion 52w of the guide member 50 (the 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 circumferential surface of the tapered portion 25 of the body portion 21 and further swivels left by the swivel guide 34. That is, the synergistic effect of the guide member 50 and the swivel guide 34 causes the flowing wastewater to strongly swivel left.

[0039] Furthermore, wastewater that is not received by the swivel guide main body 52 of the guiding guide member 50 and flows down along the inner circumferential surface of the body 21, such as wastewater flowing in from the horizontal drainage branch pipes 75, 76, is received by the auxiliary guide 31 and swirled left, as shown in Figure 3. In this way, within the body 21 of the drain pipe fitting 20, two swirling flows flow along the inner wall surface: a swirling flow caused by the guiding guide member 50 and the swirl guide 34, and a swirling flow caused by the auxiliary guide 31. Therefore, even when the drain pipe fitting 20 is used in a super high-rise building, an air core can be well formed within the body 21 of the drain pipe fitting 20, ensuring drainage performance.

[0040] When the drain pipe fitting 20 is used for mid- to high-rise buildings, it is used without the induction guide member 50 set. As a result, the wastewater flowing down along the inner surface of the body 21 of the drain pipe fitting 20 is received by the front auxiliary guide 31 and the rear swivel guide 34 and swivels to the left. As a result, two swirling flows caused by the auxiliary guide 31 and the swivel guide 34 flow along the inner wall surface inside the body 21 of the drain pipe fitting 20. This allows an air core to be well formed inside the body 21 of the drain pipe fitting 20, ensuring drainage performance suitable for mid- to high-rise buildings.

[0041] Figure 9 shows a graph of the pressure distribution inside the pipes when drainage pipe fittings 20 with guide members 50 (fittings with guide members) and drainage pipe fittings 20 without guide members 50 (fittings without guide members) are installed on each floor of a drainage experimental facility (experimental 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 experimental tower, which simulates a building. Here, both the guide- and non-guide-fittings used have a nominal diameter of 100 mm, and a fixed amount of drainage (6.5 L / s) is flowing through both. Pressure gauges are installed in fixed positions in the horizontal drainage branch pipes 75 connected to the drainage pipe fittings 20 on each floor. Furthermore, pressure measurements on each floor (1F to 5F) were performed by continuously measuring the pressure inside the pipes for a fixed period of time while drainage is flowing.

[0042] In the graph of Figure 9, the open circles and solid line represent the minimum internal pressure when a guided fitting is used, while the black circles and solid line represent the maximum internal pressure when a guided fitting is used. The open circles and dotted line represent the minimum internal pressure when a non-guide fitting is used, while the black circles and dotted line represent the maximum internal pressure when a non-guide fitting is used. For example, on the fifth floor, when a guided fitting is used, the internal pressure varies between approximately -200 Pa and approximately 20 Pa. In contrast, when a non-guide fitting is used, the internal 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 the air core facilitate the flow of wastewater through the pipe, suppressing the increase in maximum pressure.

[0043] As with the fifth floor, 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. Also, when using a guided fitting, positive pressure can be kept lower than when using a fitting without a guided fitting. In particular, 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 escape route), which tends to create positive pressure. However, when using a guided fitting, the swirling flow and air core make it easier for the discharged water to flow inside the pipe, and positive pressure can be kept lower than when using a fitting without a guided fitting.

[0044] <Advantages of the drainage pipe joint 20 according to this embodiment> According to the drain pipe fitting 20 of this embodiment, a guide member 50 can be retrofitted to the lower side of the upper receptacle 22 to swirl wastewater flowing down from the drainage 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 to the lower side of the upper receptacle 22, the wastewater flowing down from the drainage 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.

[0045] 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 joint 20. Furthermore, the thickness of the guide member 50 (maximum 1.2 mm × 2) is thinner than the thickness of the body 21 (approximately 5 mm), so the reduction in the flow path area within the body 21 due to the attachment of the guide member 50 can be minimized. Furthermore, because the guide member 50 is made of stainless steel, the guide member 50 is resistant to corrosion and has high strength. As a result, even a thin guide member 50 does not reduce its durability against the inner wall of the body 21.

[0046] <Change example 1> Here, the present invention is not limited to the above-described embodiment, and modifications are possible within the scope of the present invention. For example, in this embodiment, as shown in Fig. 3, an example is shown in which the guide member 50 is attached to the lower side of the upper socket 22 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 socket 22 from above. 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 socket 22 are integrally molded.

[0047] <Regarding the seal / 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 peripheral surface of the upper socket 22, a pleated seal main body portion 322 provided on the upper inner peripheral side of the covering cylindrical portion 324, and a lower end flange portion 324f with a U-shaped cross section formed at the lower end position of the covering cylindrical portion 324. The lower end flange portion 324f of the tubular seal portion 321 is placed on the inner flange portion 22f of the upper socket 22.

[0048] A cylindrical portion 354e of the drainage guide portion 354, which is inserted into the inner flange portion 22f of the upper receiving port 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 a lower extension of the cylindrical portion 354e and a swivel guide portion 352x that causes the drainage water flowing downstream to swivel 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-cum-guide member 320 that integrates the cylindrical sealing material 32 and the guide member 50, it is possible to prevent the guide member 50 from falling over time. In addition, it also becomes easier to attach the seal-cum-guide member 320 to the drain pipe joint 20.

[0049] Furthermore, in this embodiment, an example has been shown in which the guide member 50 or the seal / guide member 320 is attached to the cast iron drainage pipe fitting 20, but it is also possible to attach the guide member 50 or the seal / guide member 320 to a resin drainage pipe fitting, for example. Furthermore, in this embodiment, an example has been shown in which the guide member 50 is attached to the drainage pipe fitting 20 which is provided with the auxiliary guide 31 and the swivel guide 34 on the inner circumferential surface of the body 21, but by attaching the guide member 50 to a drainage pipe fitting which is provided only with the swivel guide 34, the drainage pipe fitting can be used in super high-rise buildings.

[0050] <Change examples 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 in 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 inside 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. [Explanation of symbols]

[0051] 20···Drainage pipe fitting 21. Torso 22 Upper socket 22f Inner flange 24 Horizontal branch pipe socket 31. Auxiliary guide 32 Cylindrical sealing material (sealing material) 34. Swivel guide 50....Induction guide member 52 Swivel guide body 52w...Edge vertical wall part (vertical wall part) 54 Cylindrical support part 54e Cylindrical part 54f Outer flange 60···Drainage pipe fitting 65···Three-way drain pipe joint 70···Drainage stack pipe 75...Drainage side branch pipe 76...Drainage side branch pipe 320··Seal and guide member CS···Floor slab

Claims

1. 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. 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.

3. 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. 4. The drain pipe joint according to claim 3, The drainage pipe joint, wherein the induction guide member is made of stainless steel.

5. 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.

6. 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 an 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 projecting radially inwardly of 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.

7. 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.

Images