JP2023138491A - Joint for vertical pipe - Google Patents

Abstract

To provide a joint for a vertical pipe which is excellent in earthquake resistance and workability (which enables connection work of a vertical pipe to be conducted more easily than conventional methods).SOLUTION: A joint 1 for a vertical pipe connects an upper vertical pipe Tu with a lower vertical pipe Tl and has: a joint body 2 into which the upper vertical pipe Tu and the lower vertical pipe Tl are inserted; displacement restoration means which restores horizontal displacement in the upper vertical pipe Tu; and lower fixing means which fixes the lower vertical pipe Tl to the joint body 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vertical pipe joint used for connecting vertical pipes.

2. Description of the Related Art Piping has conventionally been installed inside buildings and along exterior walls to allow fluids such as gas and water to flow vertically relative to the ground. Such piping is provided by connecting a plurality of vertically arranged pipes (hereinafter also referred to as "vertical pipes"). The plurality of vertical pipes are connected by screwing, welding, etc. depending on the material and diameter of the pipes.

When an earthquake occurs, vertical pipes are subjected to forces that displace them horizontally and vertically. In particular, the vertical pipe is easily displaced in the horizontal direction due to its vertically arranged structure. Here, the horizontal displacement of a building when vibration occurs due to an earthquake or the like is described as an interstory displacement or an interstory displacement angle. Interstory displacement is horizontal displacement that occurs between upper and lower floors. Furthermore, the interstory displacement angle (interstory deformation angle) is the ratio of the interstory displacement to the height of each floor. Standpipes connected by screwing, welding, etc. may be deformed in places where stress tends to concentrate or where the strength is low due to earthquakes. Therefore, when designing piping for buildings, etc., it is necessary to consider the seismic design type and perform seismic analysis according to the structure of the building to prevent deformation, etc., which requires a lot of man-hours and is complicated. It is. In order to reduce such complexity, piping members having earthquake resistance have been proposed.

Patent Document 1 describes an earthquake-resistant piping system in which a lower connecting part of a drain pipe joint installed through a concrete slab on the upper floor of an apartment complex is inserted and connected to an upper socket of a drain pipe on the lower floor. The document describes a drainage facility in which the lower end of the drainage stand pipe is inserted and connected to the upper socket of a drain pipe joint installed by penetrating the concrete slab on the lower floor. In this drainage equipment, the upper socket of the drainage stack and the upper socket of the drainage pipe joint are designed to prevent the drainage stack from tilting when the drainage pipe joints on the upper and lower floors are horizontally displaced relative to each other due to interstory displacement during an earthquake. It is configured so as not to interfere with Further, the upper socket of the drainage stack and the upper socket of the drain pipe joint are configured to maintain watertightness. As a result, it is stated that the seismic performance of drainage equipment can be ensured.

Patent No. 5389431

By the way, as the working population has been decreasing in recent years, there has been a shortage of pipers and welders, and the average age of pipers and welders is rising. Conventional piping connection work requires work in narrow pipe spaces or at high places, such as in the ceiling, and is labor-intensive. Therefore, it is considered necessary to improve the workability of pipe connection work, taking into account the increasing number of elderly pipe and welding workers. Furthermore, in the future, it is expected that there will be a further shortage of workers, so it is necessary to increase the length of piping that can be connected in one day, shorten the construction period, and minimize the number of workers involved.

In the case of the drain pipe joint described in Patent Document 1, although it has seismic performance, the lower connecting part of the drain pipe joint penetrates the concrete slab on the upper floor and is inserted and connected to the upper receptacle of the drain vertical pipe on the lower floor. The configuration is as follows. Therefore, the length in the vertical direction is longer than at least the thickness of the concrete slab, and the size is considered to be relatively large. For this reason, it takes up a lot of work space, and it is thought that there is room for improvement in workability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint for vertical pipes that has excellent earthquake resistance and is easy to construct (making vertical pipe connection work easier than conventional methods). With the goal.

The vertical pipe joint of the present invention is a vertical pipe joint that connects an upper vertical pipe and a lower vertical pipe. It is characterized by having a displacement restoring means for restoring the horizontal displacement in the joint body, and a lower fixing means for fixing the lower vertical pipe to the joint body.

In the present invention, the vertical pipe joint may have an elastic body inside the joint main body, which contacts the lower end surface of the upper vertical pipe and absorbs vertical displacement of the upper vertical pipe.

Further, in the present invention, the lower fixing means may include a tightening member that substantially surrounds and tightens the lower vertical pipe.

Further, in the present invention, the joint body may have a swallowing allowance in which the upper end portion of the lower vertical pipe is accommodated when the lower vertical pipe is displaced in the vertical direction. Further, in the present invention, the vertical pipe joint has a spacer between the floor to which the vertical pipe joint is fixed and the joint body, which can be divided into a plurality of parts on a plane including the central axis of the vertical pipe joint, and the length of the spacer is The length may be greater than the length of the upper vertical pipe inserted into the joint body, and the length of the swallowing allowance may be greater than the length of the spacer.

In addition, in the present invention, the vertical pipe joint includes a sealing member that is provided in a groove formed in the inner circumferential portion of the axial end surface of the joint body and that comes into close contact with at least one of the upper vertical pipe and the lower vertical pipe. The flange member has a flange member to which a seal member is mounted between the joint body, and the flange member has a convex portion that fits into a groove portion of the joint body, and the seal member is pushed into the inside of the groove portion by the convex portion. May be accommodated.

By having the above structure, the vertical pipe joint of the present invention has excellent earthquake resistance because even if the upper vertical pipe is displaced when vibration occurs due to an earthquake or the like, the displacement can be restored. In addition, since the structure allows for miniaturization, it is easy to construct.

FIG. 1 is a perspective view of a first embodiment of a vertical pipe joint according to the present invention. It is a longitudinal cross-sectional view of the joint for vertical pipes of a 1st embodiment. FIG. 3 is a longitudinal sectional view of a state in which a standpipe is inserted into the joint of FIG. 2; FIG. 3 is a perspective view of a corrugated correction ring. FIG. 2 is a perspective view and a plan view of a correction ring made of a tight coil spring. It is a perspective view of 2nd Embodiment of the joint for vertical pipes based on this invention. It is a longitudinal cross-sectional view of the vertical pipe joint of 2nd Embodiment. FIG. 8 is a longitudinal cross-sectional view of a state in which a standpipe is inserted into the joint of FIG. 7; It is a figure for demonstrating the operation|movement when removing an upper vertical pipe. It is a figure which shows the state where the lower vertical pipe is exposed. It is a figure which shows the state where the lower end of the upper vertical pipe is exposed. It is a longitudinal cross-sectional view of 3rd Embodiment of the joint for vertical pipes based on this invention.

(First embodiment)
A first embodiment of a vertical pipe joint (hereinafter also simply referred to as a "joint") according to the present invention will be described based on FIGS. 1 to 3. FIG. 1 is a perspective view of a vertical pipe joint according to a first embodiment. As shown in FIG. 1, the vertical pipe joint 1 connects the tip (lower end) of the upper vertical pipe Tu and the tip (upper end) of the lower vertical pipe Tl by housing them inside the joint body 2. . Note that the vertical pipe joint 1 of the present invention is installed so that the axis of its central axis runs along the vertical direction. In the present invention, "upper side" and "lower side" refer to the upper side and lower side in the vertical direction, respectively. The vertical pipe joint 1 can connect, for example, a carbon steel pipe for piping called SGP (Steel Gas Pipe) pipe, a stainless steel pipe, a polyethylene pipe (PE pipe), and the like.

The joint body 2 is a substantially cylindrical member and is placed on a floor surface (not shown) that is an installation surface. The joint body 2 includes a housing 21 , an upper flange portion 22 provided around the upper end of the housing 21 , and a lower flange portion 23 provided around the lower end of the housing 21 . A plate flange 24 having a circular through hole in the center is arranged above the upper flange portion 22. By tightening bolts and nuts (not shown) through the through holes formed in the plate flange 24 and the upper flange portion 22, the lock ring (see FIG. 3), which is the tightening member 14, is tightened, and the vertical pipe Tl is fixed to the joint body 2. Further, the lower flange portion 23 is fixed to the floor by fastening with bolts and nuts.

The plate flange 24 and the upper flange portion 22 have an annular shape. The plate flange 24 and the upper flange portion 22 each have three bolt holes penetrating in the vertical direction. In the present invention, the term "circular shape" includes a form in which a part of a circular ring is cut out. The plate flange 24 is not limited to one member, but may be divisible or may be constructed from a combination of a plurality of members. When the plate flange 24 is divisible, it is preferable that the plate flange 24 has a structure that allows it to be attached or removed without inserting or removing the vertical pipe Tu into the through hole of the plate flange. It may also be constructed from other members. In this case, it is possible to attach it to the vertical pipe Tu at any time during construction, resulting in excellent workability. Further, the lower flange portion 23 has a substantially equilateral triangular shape and has three bolt holes penetrating in the vertical direction. Note that the shape of the flange is not limited to an annular shape or a triangle, but may be an ellipse, a polygon, or the like. The number of bolt holes is not limited to three, and for example, two to ten bolt holes may be arranged at equal intervals in the circumferential direction.

In the vertical pipe joint 1 shown in FIG. 1, the axial length L1 of the joint 1 is, for example, 80 mm to 220 mm. For example, since the vertical pipe joint 1 is placed on the floor, it is more axially The length can be shortened, making it easy to downsize. The diameter D1 of the plate flange 24 and the upper flange portion 22 is, for example, 80 mm to 240 mm. The length L2 of one side of the lower flange portion 23 is, for example, 120 mm to 360 mm.

FIG. 2 is a vertical cross-sectional view including the central axis of the joint before the vertical pipe is inserted, and FIG. 3 is a vertical cross-sectional view with the vertical pipe inserted. Inside the vertical pipe joint 1, a vertical pipe Tu is connected to the upper side, and a vertical pipe Tl is connected to the lower side (see FIG. 3). In the present invention, the direction along the central axis O of the vertical pipe joint 1 is referred to as the axial direction, and the direction perpendicular to the central axis O when viewed from the axial direction is referred to as the radial direction, and the direction around the central axis O in the plan view is referred to as the radial direction. The direction of rotation is called the circumferential direction.

As shown in FIG. 2, the vertical pipe joint 1 includes a joint body 2, a correction ring 3 as a displacement restoring means for restoring horizontal displacement in the upper vertical pipe Tu, and a vertical pipe joint 1 that connects the lower vertical pipe Tl to the joint body. 2. In the vertical pipe joint 1, a sealing member 5 and a fireproof packing 6 are installed between each member to seal the fluid flowing through the pipe. The seal member 5 and the fireproof packing 6 have a substantially elliptical cross section.

The vertical pipe joint 1 includes, inside a housing 21, an inner cylinder 9 that is pressed downward by a plate flange 24 by fastening bolts 7u and nuts 8u, and a retainer ring that is pressed downward by the inner cylinder 9. 10. In FIG. 2, the lower fixing means 4 includes a bolt 7u, a nut 8u, a plate flange 24, an inner cylinder 9, a retaining ring 10, and a tightening member 14. A sealing member groove is formed along the circumferential direction on the lower end surface of the plate flange 24 (not shown).

The inner cylinder 9 is a cylindrical member, and has an upper inner hole 11 having a substantially constant inner diameter into which the upper vertical pipe Tu is inserted. An outer circumferential groove 12a is formed on the outer circumferential surface of the inner cylinder 9, into which a part of a correction ring 3, which will be described later, is fitted. The outer circumferential groove 12a is formed at two locations on the upper side and the lower side of the inner cylinder 9, spaced apart in the axial direction. In addition, in order to suppress movement of the correction ring 3 in directions other than the horizontal direction, it is preferable that the correction ring 3 is mounted in the groove. The groove portion is not limited to the outer circumferential groove 12a of the inner cylinder 9, but may be an inner circumferential groove provided in the housing 21. These groove shapes are not particularly formed, and it is sufficient that a part of the correction ring 3 can be fitted therein. Further, the number of grooves such as the outer circumferential groove 12a is not limited to two.

The inner peripheral surface of the inner cylinder 9 is formed with a sealing member groove into which the sealing member 5 is mounted and a fireproof packing groove into which the fireproof packing 6 is mounted. The refractory packing groove is located further back (inner side) than the sealing member groove when viewed from the insertion side of the upper vertical pipe Tu. Moreover, a groove for a sealing member is formed on the upper end surface of the inner cylinder 9, and a groove for a fireproof packing is formed on the lower end surface.

The housing 21 has a lower inner hole 13 having a substantially constant inner diameter into which a lower vertical pipe is inserted. The inner peripheral surface of the housing around the lower inner hole 13 is formed with a sealing member groove into which the sealing member 5 is mounted and a fireproof packing groove into which the fireproof packing 6 is mounted. The fireproof packing groove is formed on the inner side (inner side) of the sealing member groove when viewed from the insertion side of the lower vertical pipe Tl.

As shown in FIG. 3, a substantially annular tightening member 14 that surrounds and tightens the vertical pipe Tl is provided below the presser ring 10 described above. Preferably, the clamping member 14 is formed from a metallic material. The tightening member 14 may have an annular shape that surrounds the vertical pipe Tl, but from the viewpoint of ease of diameter reduction, which will be described later, the tightening member 14 may be a substantially C-shaped member with an opening at one point in the circumferential direction. There may be. The tightening member 14 is not limited to a single member, and may be separable or may be configured by a combination of a plurality of members. The standpipe Tl is inserted into the housing 21 of the standpipe joint 1, and its upper end passes through the tightening member 14 and reaches the inner peripheral side of the retainer ring 10.

The outer peripheral side of the tightening member 14 has a tapered structure that decreases in diameter toward the bottom, and the corresponding portion of the housing 21 that accommodates the tightening member 14 also has a tapered structure that decreases in diameter toward the bottom. . Moreover, it is preferable that teeth portions are formed on the inner circumferential side of the tightening member 14 so as to bite into the outer circumferential surface of the vertical pipe Tl.

Since the vertical pipe joint 1 has the above configuration, the inner cylinder 9 is pressed downward by the plate flange 24 by fastening the bolt 7u and the nut 8u. The fastening force between the bolt 7u and the nut 8u is transmitted to the retaining ring 10 via the plate flange 24 and the inner cylinder 9. Further, when the clamping member 14 is pushed downward under the force of the retaining ring 10, the diameter of the clamping member 14 is reduced due to the tapered structure, and its teeth bite into the outer surface of the vertical pipe Tl. Thereby, the standpipe Tl is fixed (held) to the standpipe joint 1.

In addition, in FIG. 3, the vertical pipe joint 1 is configured to have a presser ring 10 and a tightening member 14 as the lower fixing means 4, but the tightening member 14 may be formed by integrating these. Also in this case, by tightening the bolts 7u and nuts 8u, the inner cylinder 9 is pressed downward by the plate flange 24, and the tightening force between the bolts 7u and the nuts 8u is applied via the plate flange 24 and the inner cylinder 9. Preferably, the structure is such that the force is transmitted to the attachment member 14 and converted into a tightening force of the tightening member 14. In this case, for example, the outer peripheral side of the lower part of the tightening member 14 may have a tapered structure in which the diameter decreases downward.

Two correction rings 3 are provided between the inner cylinder 9 and the housing 21. The correction ring 3 is, for example, an annular elastic body. As described above, the correction ring 3 is attached with a portion thereof fitting into the outer circumferential groove 12a of the inner cylinder 9. In addition, the correction ring 3 may be installed by providing an inner circumferential groove on the inner circumferential surface of the housing 21 and fitting a part of the inner circumferential groove into the inner circumferential groove. It may be fitted and installed. In FIG. 2, the correction ring 3 is in contact with both the inner cylinder 9 and the housing 21 over the entire circumference. In this embodiment, the correction ring 3 is in contact with both the inner tube 9 and the housing 21 over the entire circumference, but does not necessarily need to be in contact over the entire circumference. The correction ring may be in a form in which at least a portion thereof is in contact with both the inner cylinder 9 and the housing 21, respectively.

The correction ring 3 may have any shape as long as it can restore the interlayer displacement of the vertical pipe Tu, and is not limited to an annular shape. For example, the shape can be a polygon, a waveform, a cylinder, a polygonal cylinder, a corrugated cylinder, or the like. Here, the waveform means a shape in which peaks and valleys of a predetermined height difference are repeatedly formed in the circumferential direction or the axial direction of a ring or cylinder. Note that the peaks and valleys may be formed linearly or planarly, or may be formed curvedly or curvedly.

As an example of the correction ring, a corrugated correction ring will be explained based on FIG. 4. FIG. 4 is a perspective view of three types of corrugated correction rings. The straightening rings 3a and 3b shown in FIGS. 4(a) and 4(b) have a plurality of semicircular arc-shaped recesses R in the circumferential direction on the inner and outer circumferential sides of a rubber annular base material, respectively. By providing them at equal intervals, peaks and valleys with predetermined height differences are repeatedly formed. The correction ring 3a has a recess R on the outer peripheral side behind the recess R on the inner peripheral side, and the peaks and valleys on the inner and outer peripheral sides are formed at the same position on the circumference. In addition, the correction ring 3b has an outer circumferential recess R on the rear side of the intermediate portion between adjacent inner circumferential recesses R, and the peaks and valleys on the inner and outer circumferential sides are different on the circumference. formed in position. The orthodontic ring 3c shown in FIG. 4(c) has a substantially cylindrical base material made of metal (for example, stainless steel) formed into a substantially gear shape, and has trapezoidal peaks and valleys at a predetermined height difference in the circumferential direction. is formed repeatedly. The straightening ring 3c has a constant thickness in the radial direction, and can act as a leaf spring when displacement between layers of the vertical pipe occurs. In addition, although the correction ring 3c has a wavy cylindrical shape with an end (gap) in FIG. 4(c), it may have a shape without an end.

Further, as another example, a correction ring made of a tight coil spring will be explained based on FIG. 5. FIG. 5(a) is a perspective view of a correction ring made of a tight coil spring, and FIG. 5(b) is a plan view of the correction ring. As shown in FIG. 5, the correction ring 3d is composed of a close-contact coil spring made of metal (e.g., stainless steel) wire wound into a coil, and has an annular shape by connecting both ends of the close-contact coil spring. There is. In the correction ring 3d, the smaller the diameter of the coil (ring width W), the smaller the radius of curvature of the wire, and the larger the restoring force can be exerted. Note that part A of FIG. 5(b) shows a partial cross section of the correction ring 3d.

From the viewpoint of the magnitude of restoring force, the correction ring is preferably a corrugated metal correction ring or a correction ring made of a metal tight coil spring. In particular, when restoring a large interlayer displacement, a correction ring made of a metal tight coil spring is suitable.

Note that the displacement restoring means may be composed of an elastic body (such as rubber or a leaf spring) capable of restoring interlayer displacement, and its form is not limited to the correction ring 3 (ring-shaped member). For example, the displacement restoring means may include a plurality of elastic bodies arranged so as to surround the inner cylinder. In this case, each elastic body may be arcuate, spherical, ellipsoidal, rectangular, or the like.

As shown in FIG. 2, by providing the correction ring 3 between the inner cylinder 9 and the housing 21, the inner cylinder 9 is placed at a substantially constant distance from the housing 21 during normal times (when not vibrating). be done. When vibration occurs due to an earthquake or the like, the inner tube 9 absorbs the interlayer displacement of the vertical pipe Tu, and the straightening ring 3 can restore the displaced position of the vertical pipe Tu to the center position. Thereby, deformation and damage to the vertical pipe Tu can be suppressed, and fluid leakage can be prevented. The vertical pipe joint 1 of the present invention can suppress the interlayer deformation angle to 1/100 or less, for example.

In this way, in the vertical pipe joint of the first embodiment, by fastening the bolts and nuts provided on the plate flange, the lower fixing means fixes the lower vertical pipe, and the upper vertical pipe is fixed. The inserted inner cylinder absorbs the interlayer displacement, and the displacement restoring means provided between the joint body and the inner cylinder restores the horizontal displacement. That is, the tube axis of the upper vertical pipe can be returned to the central axis of the joint body (the tube axis can be returned to the conventional position). As a result, even when vibrations occur due to an earthquake, the displacement of the upper vertical pipe can be suppressed, resulting in excellent earthquake resistance. As a result, the seal surface pressure around the upper vertical pipe can be made uniform, and it can be expected that the sealing performance will be excellent over a long period of time. Furthermore, since it has a simple and compact structure as described above, it has excellent workability.

Further, as shown in FIG. 3, the vertical pipe joint 1 includes a washer 15 at the lower part of the inner periphery of the inner cylinder 9 that contacts the lower end surface of the vertical pipe Tu, and a washer 15 that extends the vertical direction of the vertical pipe Tu through the washer 15. It has an elastic body 16 (coil spring) that absorbs displacement. Specifically, the washer 15 and the elastic body 16 are housed in an enlarged diameter portion of the inner peripheral surface of the inner cylinder 9. The elastic body 16 is supported by a retaining ring 10 located below, and is adapted to receive the load of the vertical pipe Tu. By providing the elastic body 16 in the vertical pipe joint 1, vertical displacement of the vertical pipe Tu due to earthquakes or thermal expansion and contraction can be absorbed, and the load on the vertical pipe Tu, the vertical pipe Tl, and the vertical pipe joint 1 can be reduced. .

In FIG. 3, the elastic body 16 may be any elastic body capable of absorbing vertical displacement of the vertical pipe Tu, and is not limited to a coil spring. For example, the elastic body 16 may be an elastomer, a plate spring, or the like. In addition, in order to make it a simpler structure, the elastic body 16 and the washer 15 may be omitted in the vertical pipe joint 1.

As shown in FIG. 3, when the vertical pipe is connected, the upper end of the vertical pipe Tl does not abut against the joint member (the retaining ring 10 in FIG. 3) in the joint body 2, and a surplus space is formed. This surplus space becomes a swallowing allowance n in which the upper end portion of the vertical pipe Tl is accommodated when the vertical pipe Tl is displaced in the vertical direction. This swallowing allowance n can further reduce the load applied to the vertical pipe Tl when the vertical pipe Tl is displaced, and can also absorb errors in the length of the vertical pipe Tl.

The fireproof packing 6 is a member for preventing fluid leakage even when the standpipe joint 1 is exposed to high temperatures due to fire or the like. The fireproof packing 6 is made of, for example, a rubber composition obtained by kneading raw rubber, a graphite intercalation compound that thermally expands in an unfoamed state, and fillers, softeners, vulcanizing agents, etc. as necessary. It is manufactured by filling a mold, forming it, and then press vulcanizing it. The fireproof packing 6 thermally expands during a fire and fills the gap between the joint 1 and the vertical pipes Tu, Tl, thereby sealing the inner peripheral surface of the joint 1 and the outer peripheral surface of the vertical pipes Tu, Tl.

The sealing member 5 is in close contact with the outer peripheral surfaces of the vertical pipes Tu and Tl, and prevents the fluid passing through the vertical pipe joint 1 from leaking to the outside of the joint 1. The seal member 5 is a ring-shaped member made of an elastic material such as NBR (nitrile rubber) or fluororubber.

Next, an example of a construction procedure for connecting the stand pipes Tu and Tl using the stand pipe joint 1 of the first embodiment will be described using FIG. 3. The construction is carried out by a builder, for example, in steps (1) to (4). In step (1), the upper end of the vertical pipe Tl protruding from the floor (not shown) is inserted into the opening on the lower side (floor side) of the joint body 2. In step (2), the bolts 7u and nuts 8u that pass through the plate flange 24 and the upper flange portion 22 are fastened, and the tightening member 14 built into the joint body 2 is used to tighten the bolts 7u and nuts 8u, which are inserted through the plate flange 24 and the upper flange portion 22. Tighten the upper end of the vertical pipe Tl. In step (3), the lower end of the vertical pipe Tu is inserted into the upper opening of the joint 1 until it contacts the washer 15. In step (4), the anchor bolt 7a is installed upward (threaded portion facing upward) into the bolt hole formed in the floor. Anchor bolts 7a are inserted into the bolt holes of the lower flange portion 23 and fastened with nuts 8a to fix the joint body 2 to the floor. Through these steps (1) to (4), the construction work of connecting the vertical pipes Tu and Tl and fixing them to the floor can be easily performed. Moreover, according to the vertical pipe joint 1, the connection of the lower vertical pipe Tl can be completed only by work on the upper floor.

(Second embodiment)
A second embodiment of the vertical pipe joint according to the present invention will be described based on FIGS. 6 to 8. Note that the same components as those in the first embodiment described using FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 6 is a perspective view of a vertical pipe joint according to the second embodiment. As shown in FIG. 6, the vertical pipe joint 1A connects the lower end of the upper vertical pipe Tu and the upper end of the lower vertical pipe Tl by housing them inside the joint main body 2A.

The joint main body 2A is a substantially cylindrical member having a constricted portion 211 in the center thereof, the inner diameter of which is smaller than the inner diameter of the upper and lower openings and whose inner diameter is substantially constant. The joint main body 2A is arranged on a floor surface (not shown) via a floor fixing flange 18. The joint body 2A includes a housing 21A, an upper flange 22A provided around the upper end of the housing 21A, and a lower flange 23A provided around the lower end of the housing 21A. A seal flange (flange member) 19 having a circular through hole in the center is arranged on the upper flange portion 22A. A floor fixing flange (flange member) 18 having a circular through hole in the center is arranged below the lower flange portion 23A. The vertical pipe Tu is fixed to the joint main body 2A by fastening bolts and nuts (not shown) through the through holes formed in the seal flange 19 and the upper flange portion 22A. Further, by fastening bolts and nuts (not shown) through the through holes formed in the floor fixing flange 18 and the lower flange portion 23A, the vertical pipe Tl is fixed to the joint body 2A and the floor ( 8).

The shapes of the seal flange 19, the upper flange portion 22A, and the lower flange portion 23A are substantially annular, and have two bolt holes penetrating in the vertical direction. Further, the shape of the floor fixing flange 18 is approximately an equilateral triangle, and has three bolt holes for fixing to the floor material penetrating in the vertical direction near each vertex of the triangle. The floor fixing flange 18 further has two bolt holes that penetrate in the vertical direction and are used for fixing to the joint body 2A. Note that the seal flange 19 and the floor fixing flange 18 may be separable, and the shape of the flange may be adopted as appropriate.

In the vertical pipe joint 1A shown in FIG. 6, the axial length L3 of the joint 1A is, for example, 90 mm to 250 mm. This vertical pipe joint 1A is also placed on the floor surface, and compared to a pipe joint that is placed through a concrete slab, the length in the axial direction can be shortened, making it easier to downsize. The axial length L4 of the joint body 2A is, for example, 60 mm to 180 mm. The diameter D2 of the seal flange 19 is, for example, 50 mm to 130 mm. The length L5 of one side of the floor fixing flange 18 is, for example, 70 mm to 190 mm.

FIG. 7 is a vertical cross-sectional view including the central axis of the joint before the vertical pipe is inserted, and FIG. 8 is a vertical cross-sectional view of the joint with the vertical pipe inserted. Inside the standpipe joint 1A, a standpipe Tu is connected to the upper side, and a standpipe Tl is connected to the lower side (see FIG. 8).

As shown in FIG. 7, the vertical pipe joint 1A includes a joint main body 2A, a correction ring 3A as a displacement restoring means for restoring horizontal displacement in the upper vertical pipe Tu, and a vertical pipe joint 1A that connects the lower vertical pipe Tl to the joint main body. 2A. Moreover, the vertical pipe joint 1A has an upper fixing means 40 for fixing the upper vertical pipe Tu to the joint main body 2A. In the vertical pipe joint 1A, the seal member 5A is installed between the upper flange portion 22A of the housing 21A and the seal flange 19. In this case, by interposing the seal member 5A, a clearance C of approximately several mm is created between the upper flange portion 22A and the seal flange 19. Due to the clearance C between the upper flange portion 22A and the seal flange 19, the upper vertical pipe Tu tends to be inclined with respect to the central axis O. The seal member 5A has the role of sealing the fluid flowing through the pipe and absorbing interlayer displacement by providing a clearance C around the pipe. In the second embodiment, the interlayer displacement is easily absorbed by providing the clearance C, but the clearance C can also be eliminated. For example, a sufficient distance is formed between the upper vertical pipe Tu to be connected and the joint body 2A, and the interlayer displacement of the upper vertical pipe Tu can be absorbed by a displacement restoring means such as a straightening ring 3A provided therebetween. In this case, clearance C can be eliminated.

Further, a fireproof packing 6A is installed between the upper vertical pipe Tu and the lower vertical pipe Tl and the housing 21A. The fireproof packing 6A is attached with a portion of the housing 21A fitting into a groove to seal the fluid flowing through the pipe. The fireproof packing 6A has a substantially elliptical cross section.

The housing 21A has an upper inner hole 11A having a substantially constant inner diameter into which the upper vertical pipe Tu is inserted. The housing 21A has a sealing member groove in which the sealing member 5A is mounted on the inner circumference of the upper axial end surface. Further, on the inner peripheral surface above the constriction part 211 of the housing 21A, there are a refractory packing groove part into which the refractory packing 6A is installed, and an inner peripheral groove 12b into which a part of the straightening ring 3A is fitted. They are formed one by one. In the vertical pipe joint 1A, a sealing member 5A, a fireproof packing 6A, and a straightening ring 3A are arranged when viewed from the insertion side of the upper vertical pipe Tu. Note that the number of correction rings 3A is not limited to one.

The upper fixing means 40 includes a bolt 7u, a nut 8u, a seal flange 19, and a seal member 5A. A seal member groove is formed at the lower end of the inner peripheral side of the seal flange 19 . The seal member 5A is a substantially cylindrical member made of an elastic material such as rubber, and is mounted with a portion thereof fitting into the upper and lower seal member grooves. In the upper fixing means 40, by fastening the bolt 7u and the nut 8u, the sealing member 5A is attached and tightly adheres to the upper vertical pipe Tu so as to seal it (see FIG. 8). The upper fixing means 40 thus fixes the upper vertical pipe Tu to the joint body 2A and prevents fluid leakage.

The housing 21A has a lower inner hole 13A having a substantially constant inner diameter into which the lower vertical pipe Tl is inserted. The housing 21A has a circumferential sealing member groove in which the sealing member 5A is mounted on the inner circumference of the lower axial end surface. Furthermore, a refractory packing groove portion into which the refractory packing 6A is mounted is formed on the inner circumferential surface of the housing 21A below the constriction portion 211.

The lower fixing means 4A includes a bolt 7l, a nut 8l, a floor fixing flange 18, a seal member 5A, and a lock ring as a tightening member 14A. A sealing member groove is formed in the inner peripheral portion of the upper axial end surface of the floor fixing flange 18 . Like the seal member 5A of the upper fixing means 40, the seal member 5A is a substantially cylindrical member made of an elastic material such as rubber, and partially fits into the seal member grooves on the joint body side and the floor fixing flange side. It is installed. Similarly to the upper fixing means 40, in the lower fixing means 4A, by fastening the bolts 7l and nuts 8l, the lower vertical pipe Tl can be fixed to the joint main body 2A, and leakage of fluid can be prevented.

As shown in FIG. 8, an annular flat plate-shaped tightening member 14A is provided on the lower end surface of the seal member 5A to surround and tighten the vertical pipe Tl. It is preferable that the tightening member 14A is formed from a metal material. The upper end of the vertical pipe Tl passes through the tightening member 14A and is housed in the lower inner hole 13A (see FIG. 7) of the housing 21A. Note that the tightening member 14A is not limited to an annular shape, but may be a substantially C-shaped member having an opening at one location in the circumferential direction. The tightening member 14A is not limited to one member, but may be separable or may be configured by a combination of a plurality of members.

Further, the tightening member 14A may be fixed to the sealing member 5A, or may be provided separately without being fixed. When the tightening member 14A is not fixed to the sealing member 5A, the sealing members 5A provided on the upper side and the lower side of the joint body can have the same structure, so that the sealing members can be made into a common component. Therefore, during construction, the same seal member can be installed regardless of the installation location, and incorrect installation of the seal member can be prevented. In addition, by using common parts, it is possible to eliminate the trouble of selecting the appropriate sealing member according to the installation location, resulting in excellent workability. On the other hand, when the tightening member 14A is fixed to the sealing member 5A, the number of parts is reduced, resulting in a simpler structure and superior workability. For example, the sealing member 5A to which the tightening member 14A is fixed can be obtained by insert molding a rubber material into a mold in which the tightening member 14A is placed. Note that the tightening member 14A may be separately bonded and fixed to the molded seal member 5A.

In the tightening member 14A, by fastening the bolt 7l and nut 8l of the lower fixing means 4A, the sealing member 5A is reduced in diameter and bites into the outer surface of the vertical pipe Tl. As described above, the tightening member 14A is provided on the lower end surface of the sealing member 5A, and is in contact with the inner circumferential groove of the floor fixing flange 18. Therefore, the vertical pipe Tl is supported by the inner circumferential groove via the tightening member 14A. As a result, the standpipe Tl is fixed to the floor by the joint 1A, suppressing excessive displacement of the standpipe Tl in the event of an earthquake, etc., and making it more difficult for loads to be applied to the standpipe Tl and the joint 1A. Note that the joint 1A may not include the tightening member 14A and may be fixed only by the sealing member 5A.

One correction ring 3A is provided between the vertical pipe Tu and the inner peripheral surface of the housing 21A above the constriction 211. The correction ring 3A is, for example, an annular elastic body. As described above, the correction ring 3A is mounted with a portion of the correction ring 3A fitting into the inner circumferential groove 12b of the housing 21A. The straightening ring 3A is in contact with both the vertical pipe Tu and the housing 21A. The straightening ring 3A only needs to be in contact with both the vertical pipe Tu and the housing 21A at least partially, and may be in contact over the entire circumference. The shape (for example, see FIGS. 4 and 5), number, etc. of the correction ring 3A can be set in the same manner as in the case of the vertical pipe joint of the first embodiment.

In the vertical pipe joint of the second embodiment, it is preferable that the sealing member has a larger radial thickness and axial thickness than the correction ring. As a result, the sealing member made of an elastic material can effectively exhibit not only a sealing function but also a displacement absorbing function due to elastic deformation when vibration occurs, thereby providing superior displacement absorbing properties as a joint.

By providing the displacement restoring means between the upper vertical pipe and the housing, the upper vertical pipe is disposed at a substantially constant distance from the housing during normal times (when not vibrating). Further, when vibration occurs due to an earthquake or the like, the displacement restoring means absorbs horizontal displacement in the upper vertical pipe, thereby suppressing deformation and damage to the pipe and preventing fluid leakage.

In the vertical pipe joint of the second embodiment, the lower fixing means fixes the lower vertical pipe by fastening with bolts and nuts provided on the floor fixing flange, and the vertical pipe is provided between the upper vertical pipe and the housing. A displacement restoring means restores the horizontal displacement. As a result, similar to the first embodiment, both earthquake resistance and workability are achieved. Furthermore, as mentioned above, it has a simple and compact structure, so it has excellent workability.

As shown in FIG. 8, the vertical pipe joint 1A includes a washer 15 that contacts the lower end surface of the vertical pipe Tu, and an elastic body 16 that absorbs vertical displacement of the vertical pipe Tu through the washer. There is. In addition, the presence or absence of the elastic body 16 and the washer 15, the material, the shape, etc. of the vertical pipe joint 1A can be set in the same manner as in the case of the vertical pipe joint of the first embodiment.

As shown in FIG. 8, when the vertical pipe is connected, the upper end of the vertical pipe Tl does not abut against the joint member (the housing 21A in FIG. 8) in the joint main body 2A, and a surplus space is formed. This surplus space becomes a swallowing allowance n in which the upper end portion of the vertical pipe Tl is accommodated when the vertical pipe Tl is displaced in the vertical direction. This swallowing allowance n can further reduce the load applied to the vertical pipe Tl when the vertical pipe Tl is displaced, and can also absorb errors in the length of the vertical pipe.

Next, an example of a construction procedure for connecting the stand pipes Tu and Tl using the stand pipe joint 1A of the second embodiment will be described using FIG. 8. The construction is carried out by a builder, for example, in steps (1) to (3). In step (1), the bolt 7l is inserted upward into the bolt hole of the floor fixing flange 18. In this state, the upper end of the vertical pipe Tl protruding from the floor (not shown) is inserted into the through hole of the floor fixing flange 18, and the floor fixing flange 18 is placed on the floor. At this time, an anchor bolt provided upward in the bolt hole of the floor material is inserted into the floor fixing bolt hole of the floor fixing flange 18, and the anchor bolt and nut are fastened to fix the joint body 2A to the floor. (not shown). In step (2), the tightening member 14A and the sealing member 5A are fitted into the vertical pipe Tl, and then the joint body 2A is attached. The bolt 7l and nut 8l are fastened to fix the joint body 2A to the vertical pipe Tl. In step (3), the lower end of the vertical pipe Tu is inserted into the through hole of the seal flange 19, and the seal member 5A is fitted into the lower end of the vertical pipe. Subsequently, after inserting the lower end of the vertical pipe Tu into the joint main body 2A, the bolt 7u and nut 8u are fastened to fix the vertical pipe Tu to the joint main body 2A. Through these steps (1) to (3), the construction work of connecting the vertical pipes Tu and Tl and fixing them to the floor can be easily performed.

Although the construction method of the vertical pipe joint of the first embodiment and the second embodiment described above has been described in the case where the vertical pipe is fixed with the joint main body close to the floor, the construction method is not limited to this. As a construction method for the joint, for example, a spacer may be provided between the floor and the joint, and the vertical pipe may be fixed with the floor and the joint main body separated by a predetermined distance.

In addition to providing a splittable spacer between the floor and the joint body, a predetermined length of swallowing allowance is provided on the joint body to prevent the need to reconnect for some reason during construction, or to prevent aging of the standpipe. When it becomes necessary to remove the vertical pipe due to damage or damage, the vertical pipe can be easily removed. An example of the vertical pipe removal work will be described below with reference to FIGS. 9 to 11.

FIG. 9 shows a state of a standpipe joint according to a modification of the second embodiment before removal work. The vertical pipe joint 1A has a spacer 20 between the floor F to which the vertical pipe joint 1A is fixed and the joint main body 2A, and the vertical pipes Tu and Tl are connected with the floor F and the joint main body 2A apart. Fixed. In FIG. 9, the spacer 20 is a pair of half-shaped members that can be divided into two on a plane including the central axis O of the vertical pipe joint 1A. A pair of members constituting the spacer 20 are opposed to each other so as to surround the vertical pipe Tl, and are fixed by pressing the outer circumferential surface with a fixing tool such as a hose band (not shown). Each member constituting the spacer 20 has a flange portion 20a and a cylindrical portion 20b. A sealing member groove portion is formed at the inner circumferential upper end of the cylindrical portion 20b, into which the sealing member 5A and the tightening member 14A are mounted. The sealing member 5A is mounted with a portion thereof fitting into the sealing member groove. First, in order to release the vertical pipe Tl from the fixed state with the floor F, the nut 8l is loosened and the spacer 20 is removed. Here, the spacer 20 is divided into two parts along a plane including the central axis O of the vertical pipe joint 1A and removed. Note that the shape of the spacer 20 is not limited to the half-split shape. In addition to the form in which the spacer is divided into two along a plane including the central axis O, the spacer may include two or more members that are divided in a direction perpendicular to the central axis O.

FIG. 10 shows a state in which the spacer has been removed and the lower vertical pipe is exposed between the joint body and the floor. In this state, the joint body 2A is fixed to the lower end of the vertical pipe Tu via the seal member 5A. Next, the nut 8u is loosened to release the fixed state between the joint body 2A and the vertical pipe Tu.

FIG. 11 shows a state in which the joint body has moved downward and the lower end of the upper vertical pipe has been exposed. The joint main body 2A, which is no longer fixed to the vertical pipe Tu, can slide downward. Here, in this modification, as shown in FIG. 9, the length (axial length) Ls of the spacer 20 is the length of the lower end of the vertical pipe Tu inserted into the upper inner hole inside the joint body 2A. Larger than Lu. Further, the length Ln of the swallowing allowance n in the lower inner hole inside the joint body 2A in which the vertical pipe Tl is accommodated when the joint body 2A slides downward is greater than the length Ls of the spacer 20. . Thereby, as shown in FIG. 11, by sliding the joint body 2A to near the floor surface, the lower end of the vertical pipe Tu is exposed, and the lower end of the vertical pipe Tu can move freely. The upper end of the vertical pipe Tu (corresponding to the upper end of the lower vertical pipe on the upper floor) can also be removed by releasing the fixed state in the same manner.

In this way, when the vertical pipe joint of the present invention has a splittable spacer and the joint body has a swallowing allowance of a predetermined length, when removing the vertical pipe, it is necessary to remove the vertical pipe in order from the upper vertical pipe. Since there is no need to remove or cut the pipe, it is possible to remove joints and standpipes in the middle of piping, even in narrow pipe spaces. This reduces the burden of piping work such as removing and reinstalling the standpipe.

(Third embodiment)
A third embodiment of the vertical pipe joint according to the present invention will be described based on FIG. 12. Note that the same configurations as those in the second embodiment are given the same reference numerals, and detailed explanations will be omitted. FIG. 12 is a longitudinal cross-sectional view of the vertical pipe joint of the third embodiment with the vertical pipe inserted. As shown in FIG. 12, the vertical pipe joint 1B does not have a tightening member and is fixed by a seal member 5B. In addition, the vertical pipe joint 1B does not have a washer that contacts the lower end surface of the vertical pipe Tu and an elastic body that absorbs vertical displacement of the vertical pipe Tu through the washer, and has a simple structure. It has become. The vertical pipe joint 1B may include a washer that contacts the lower end surface of the vertical pipe Tu, and an elastic body that absorbs vertical displacement of the vertical pipe Tu through the washer. In this case, the same effects as in the first embodiment etc. are achieved.

As shown in FIG. 12, the housing 21B of the joint body 2B is a substantially cylindrical member. The vertical pipe joint 1B includes a seal member 5B provided between the upper vertical pipe Tu and the joint main body 2B, and a seal member 5B provided between the lower vertical pipe Tl and the joint main body 2B. One each on the upper side and one on the lower side. In addition, the sealing member 5B should just be provided between the joint main body 2B and at least one of the upper vertical pipe Tu and the lower vertical pipe Tl.

Here, in the vertical pipe joint 1B of the third embodiment, the mounting form of the seal member 5B is different from that of the second embodiment. Specifically, in the second embodiment, a part of the seal member is fitted into the seal member grooves on both the joint body side and the flange member side, whereas in the third embodiment, one part is fitted into the seal member grooves on both the joint body side and the flange member side. A seal member is fitted and installed inside the side seal member groove. As a result, the sealing member is not exposed to the outside in the clearance C portion.

As shown in FIG. 12, in the vertical pipe joint 1B, sealing member grooves G are formed in the inner peripheral portions of the upper and lower axial end surfaces of the joint body 2B. On the other hand, the seal flange 19 has an annular convex portion P protruding downward on the inner circumferential portion of the joint body 2B side, that is, on the inner circumferential portion of the lower axial end surface. There is. The protrusion P can be fitted into the sealing member groove G, and has a so-called inro structure. Specifically, when the protrusion P and the sealing member groove G are fitted together, the outer diameter of the protrusion P and the center of the inner diameter of the sealing member groove G can be aligned.

The sealing member groove G has a tapered structure in which the diameter decreases toward the center of the joint body 2B in a longitudinal cross-sectional view, and has an inclined surface. Moreover, the seal member 5B is in contact with the seal member groove G at the above-mentioned inclined surface. The seal flange 19 is in contact with the seal member 5B at the end surface of the convex portion P.

When the bolt and nut are fastened with the convex portion P inserted into the seal member groove G in which the seal member 5B is accommodated, the distance between the seal flange 19 and the joint body 2B becomes closer. As a result, the seal member 5B sandwiched between the convex portion P and the joint body 2B is deformed so as to expand in diameter in the outer circumferential direction and contract in the inner circumferential direction, and the vertical pipes Tu, Tl and the joint body 2B can be fully adhered to each of them. As shown in FIG. 12, the seal member 5B is pushed into the seal member groove G by the protrusion P, and is covered by the seal flange 19. In this way, by housing and installing the seal member 5B inside the vertical pipe joint 1B, deterioration of the seal member 5B due to exposure to the external environment (for example, chemicals, water, detergent, etc.) can be prevented. can do.

Moreover, although the seal flange 19 has been described above as a flange member, the floor fixing flange 18 also has a convex portion P that fits into the seal member groove G of the joint body 2B. In this case, the lower seal member 5B is also pushed in by the convex portion P and accommodated inside the seal member groove G.

Note that the vertical pipe joint of the third embodiment is not limited to the configuration shown in FIG. 12, but may have a configuration in which a convex portion is provided on the joint main body side and a sealing member groove portion is provided on the flange member side, for example. Specifically, the joint body may have an annular convex portion on the inner circumference side of the seal flange, and the flange member may have a seal member groove on the inner circumference side of the joint body. In this case as well, the convex portion of the joint body can fit into the sealing member groove of the flange member, so that the above-described effect of suppressing deterioration of the sealing member can be exerted.

The vertical pipe joint of the present invention can be used as a joint for pipes through which fluids such as gas such as LP gas and city gas, and water such as tap water and wastewater flow. In particular, it is suitable as a joint for gas piping because it has excellent sealing properties, earthquake resistance, and fire resistance.

The vertical pipe joint of the present invention may be any type of joint as long as the lower fixing means can fix the lower vertical pipe and the displacement restoring means inside the joint main body can restore horizontal displacement, and the internal arrangement of the joint The configuration of each member is not limited to the above-mentioned joint.

As described above, the joint of the present invention has excellent earthquake resistance and workability, and is therefore suitable as a joint for vertical pipes for various fluids.

1, 1A, 1B: Vertical pipe joint (joint)
2, 2A, 2B: Joint body 21, 21A, 21B: Housing 211: Narrow portion 22, 22A, 22B: Upper flange portion 23, 23A: Lower flange portion 24: Plate flange 3, 3A, 3a, 3b, 3c, 3d: Straightening rings 4, 4A, 4B: Lower fixing means 40, 40A: Upper fixing means 5, 5A, 5B: Seal members 6, 6A: Fireproof packing 7a: Anchor bolts 7u, 7l: Bolts 8a, 8u, 8l: Nut 9: Inner cylinder 10: Holding ring 11, 11A: Upper inner hole 12a: Outer groove 12b: Inner groove 13, 13A: Lower inner hole 14, 14A: Tightening member 15: Washer 16: Elastic body 18: Floor Fixed flange 19: Seal flange 20: Spacer 20a: Flange portion 20b: Cylindrical portion n: Insertion allowance C: Clearance F: Floor Tu, Tl: Vertical pipe O: Center axis R: Recess G: Seal member groove P: Convex Part W: Ring width

Claims (6)

A vertical pipe joint that connects an upper vertical pipe and a lower vertical pipe,
a joint body that passes through the upper standpipe and the lower standpipe; a displacement restoring means that restores horizontal displacement in the upper standpipe; and a joint body that fixes the lower standpipe to the joint body. A vertical pipe joint characterized in that it has a lower fixing means. The vertical pipe joint according to claim 1, further comprising an elastic body inside the joint main body, which abuts against a lower end surface of the upper vertical pipe and absorbs vertical displacement of the upper vertical pipe. . 3. The vertical pipe joint according to claim 1, wherein the lower fixing means includes a tightening member that substantially surrounds and tightens the lower vertical pipe. 2. The joint main body has a swallowing allowance in which an upper end portion of the lower vertical pipe is accommodated when the lower vertical pipe is displaced in the vertical direction. Fittings for vertical pipes described in . The vertical pipe joint has a spacer between the floor to which the vertical pipe joint is fixed and the joint main body, which can be divided into a plurality of parts on a plane including the central axis of the vertical pipe joint,
5. The spacer according to claim 4, wherein the length of the spacer is larger than the length of the upper vertical pipe inserted into the joint body, and the length of the swallowing allowance is larger than the length of the spacer. Fittings for vertical pipes as described. The vertical pipe joint includes a sealing member that is provided in a groove formed in an inner circumferential portion of an axial end surface of the joint body and that comes into close contact with at least one of the upper vertical pipe and the lower vertical pipe; a flange member for mounting the seal member between the joint body and the joint body;
The flange member has a convex portion that fits into the groove of the joint body, and the seal member is pushed by the convex portion and accommodated inside the groove. The vertical pipe joint described in item 2.

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