JP2019007306A - Fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint in which the size and shape of a lateral branch fitting portion can be easily changed. SOLUTION: A main pipe 2 having an engaged portion 16 on an outer peripheral surface 2r, and a branch pipe having an engaging portion engageable with the engaged portion 16 and configured to be detachable from the main pipe 2. , And the relative position between the engaged portion 16 and the engaged portion is determined in the circumferential direction about the axis of the branch pipe in the engaged state between the engaged portion 16 and the engaged portion. Has been done. [Selection diagram] Fig. 3

Description

  The present invention relates to a joint applicable to a drainage system or the like.

  In recent years, in multi-layer buildings such as apartment buildings, wastewater discharged from sanitary equipment etc. on each floor is collected from the sanitary equipment etc. on each floor via drainage pipes into drainage drainage pipes installed in the pipe shaft, It is drained into the sewer through curved pipes and horizontal pipes. In this way, in the drainage system for draining drainage discharged from sanitary equipment etc. on each floor to the sewer (hereinafter simply referred to as drainage system), the vertical pipe and the side branch pipe constituting the drainage pipe are connected. In addition, a collective joint (joint) having a main pipe capable of connecting a stand pipe to each of an upper end portion and a lower end portion and a branch pipe connected to a side surface of the main pipe and capable of connecting a lateral branch pipe is used. Yes.

  For example, in Patent Document 1, an upper trunk portion made of a thermoplastic resin that is disposed on a floor slab and has a receiving port to which a drain pipe on an upper floor is connected, and a portion embedded in the floor slab, The upper end connection portion connected to the lower end portion, the lower end connection portion projecting downward from the ceiling surface of the floor slab, and connected to the drain pipe on the lower floor, and the lower portion between the upper end connection portion and the lower end connection portion A drain pipe having a lower body portion made of a thermoplastic resin, and a thermoplastic resin interior member fitted inside the lower body portion. A coupling is disclosed.

JP 2014-134098 A

  Recently, the equipment used for sanitary equipment and drainage systems has been changed by, for example, indoor renovation after piping, and the specifications of the size and shape of the side branch pipe (also called horizontal pipe) inserted into the collective joint have been changed. May be required. Conventional collective joints including a drain pipe joint described in Patent Document 1 are embedded in a floor slab, and a main body portion of the joint is fixed. Further, in a conventional collective joint, a portion into which a side branch pipe is inserted (hereinafter sometimes referred to as a side branch insertion portion) is formed integrally with the main body portion, or the side branch insertion portion is bonded to the main body portion. Many of them are connected in a non-detachable state. Therefore, the conventional joint joint has a problem that it is difficult to change the size and shape of the lateral branch insertion portion. In such a configuration, in order to change the specifications of the side branch pipe, it is necessary to perform significant work such as removing the collective joint once embedded in the floor slab and embedding the collective joint with the modified side branch insertion part in the floor slab. Become.

  As a case corresponding to the above case, a flange structure may be employed in a cast iron joint or the like as the variable structure of the lateral branch insertion portion. However, the strength of the portion for fixing the screw is required, and there are other problems such as a heavy cast iron joint, poor fit of the cast iron joint, and reduced workability.

  This invention is made | formed in view of the above-mentioned situation, and provides the coupling which can change the size and shape of a horizontal branch insertion part easily.

  A joint according to the present invention includes a main pipe having an engaged portion on an outer peripheral surface, a branch pipe having an engaging portion engageable with the engaged portion, and configured to be detachable from the main pipe. And the relative positions of the engaged portion and the engaging portion are determined in the circumferential direction around the axis of the branch pipe in the engaged state between the engaged portion and the engaging portion. It is characterized by being.

  According to the above configuration, the branch pipe is detachably attached to the main pipe and can be connected to the main pipe at a predetermined relative position in the circumferential direction, so that it matches the size and shape of the side branch pipe. The branch pipe can be replaced. In addition, when the diameter of the side branch pipe is smaller than the diameter of the engaged portion of the main pipe, the horizontal branch pipe, the branch pipe, and the fluid flowing down the inside of the main pipe (for example, drainage etc.) do not stagnate. For this purpose, the branch pipe may be eccentrically connected to the main pipe so that the bottom end of the lateral branch pipe and the bottom end of the engaged part are substantially at the same height. According to the above-described configuration, the relative position between the engaged portion and the engaging portion is determined in the circumferential direction about the axis of the branch pipe. On the other hand, by setting the branch pipe to an appropriately eccentric position, the orientation and position of the branch pipe relative to the main pipe when the branch pipe is replaced can be easily adjusted.

  In the above-described joint, the engaged portion and the engaging portion can be relatively positioned by a bayonet structure, the bayonet claw is provided in the engaging portion, and the bayonet claw is provided in the engaged portion. An annular groove through which the bayonet claw fits can be formed. The annular groove can be inserted therethrough and can be connected to the annular groove and recessed along the axis in the center of the main pipe.

  According to the configuration described above, the bayonet claw is inserted into the annular groove, the branch pipe is rotated in the circumferential direction about the axis, and the bayonet claw is fitted into the recess, so that the branch pipe can be easily made with respect to the main pipe, and They can be connected at a predetermined relative position. Further, the connection between the branch pipe and the main pipe can be released by moving the bayonet claw from the recess to the annular groove and removing it from the annular groove.

  In the joint described above, the engaged portion and the engaging portion can be relatively positioned by screw tightening, and a threaded engagement surface is formed on the engaging portion. The engaged surface that can be brought into contact with the engaging surface can be screwed to the engaging surface, and the main pipe and the branch pipe are determined in the circumferential position in the circumferential direction when the screwing is completed. It may be formed as follows.

  According to the above-described configuration, the branch pipe is fitted to the engaged portion of the main pipe while rotating the branch pipe along the axis line so that the engaging surface is screwed to the engaged face. On the other hand, it is possible to easily connect at a predetermined relative position. Further, the connection between the branch pipe and the main pipe can be released by rotating the branch pipe in the opposite direction to the connection with the main pipe.

  In the above-described joint, the branch pipe has a fitting portion configured to be able to fit a pipe material on the side opposite to the side connected to the main pipe, and is elastic between the fitting portion and the pipe material. You may be comprised so that a member can be installed.

  According to the above-described configuration, the pipe material or the branch pipe expands or contracts depending on the temperature of the fluid flowing in the pipe material or the branch pipe, for example, in a state where the pipe material such as the resin pipe (that is, the horizontal branch pipe) is fitted into the branch pipe. Even in this case, expansion and contraction is absorbed by the elastic member, and the fitting state of the pipe material can be maintained well. By installing the elastic member in the branch pipe in advance, the pipe material of a length necessary for connecting to the branch pipe from the long pipe material is cut out and inserted into the fitting portion as described above. The influence of expansion and contraction of the branch pipe can be suppressed and the fitting state of the pipe material can be maintained well.

  In the above-described joint, a sealing member may be provided between the branch pipe and the main pipe in the engaged state.

  According to the above-described configuration, the water stoppage is enhanced in the engaged state between the branch pipe and the main pipe, so that leakage of fluid from the connecting portion between the branch pipe and the main pipe can be reliably prevented.

  According to the joint according to the present invention, the size and shape of the lateral branch insertion portion can be easily changed.

It is a side view of a drainage system provided with a joint of a first embodiment to which the present invention is applied and the joint. It is a side view of a part of the joint of the first embodiment to which the present invention is applied. It is a perspective view of a part of joint of a first embodiment to which the present invention is applied. It is a perspective view of a branch pipe of a joint of a first embodiment to which the present invention is applied. It is a perspective view of the modification of the branch pipe of the joint of a first embodiment to which the present invention is applied. It is a sectional side view of the collective joint in the engagement state of 1st embodiment to which this invention is applied. It is a one part perspective view of the joint of a second embodiment to which the present invention is applied. It is a perspective view of the branch pipe of the joint of a second embodiment to which the present invention is applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sound insulation cover for a joint and a joint to which the present invention is applied will be described with reference to the drawings. The drawings used in the following description are schematic, and the length, width, thickness ratio, and the like are not necessarily the same as the actual ones, and can be changed as appropriate.

(First embodiment)
As shown in FIGS. 1 and 2, a collective joint (joint) 1 according to an embodiment to which the present invention is applied is configured to be detachable from a main pipe 2 extending in the vertical direction and an outer peripheral surface 2 r of the main pipe 2. The two branch pipes 3 are provided. The axis lines J3A, J3B of the two branch pipes 3A, 3B are arranged on the same line along the left-right direction (that is, the horizontal direction), and are orthogonal to the axis line J2 of the main pipe 2. In the following description, the branch pipes 3A and 3B are referred to as a branch pipe 3 unless it is particularly necessary to distinguish between the branch pipes 3A and 3B, and this description is also applied to related components.

  A cylindrical short pipe 5 is fitted in the lower part of the main pipe 2 of the collective joint 1, and a tapered pipe 6 is fitted in the lower part of the short pipe 5. That is, a joint structure 8 is constituted by the collective joint 1, the short pipe 5, and the tapered pipe 6.

  As shown in FIG. 1, the joint structure 8 is used for a drainage system of a building (not shown) composed of multiple floors such as an apartment. Specifically, the joint structure 8 constitutes a horizontal branch pipe 7 for flowing down drainage discharged from sanitary equipment and the like on each floor, and a drainage vertical line in the pipe shaft, and the horizontal branch pipe 7 has flowed down. A vertical pipe 9 that allows the drainage to flow down to the lowest part of the drainage system is configured to be connectable.

  The lower part of the vertical pipe 9 (for example, the vertical pipe 9A) is fitted to the upper part of the main pipe 2 of the collective joint 1, and the upper part of another vertical pipe 9 (for example, the vertical pipe 9B) is connected to the lower part of the tapered pipe 6. It is mated. The taper tube 6 is formed so as to reduce in diameter as it proceeds downward. The inner diameter and outer diameter of the upper end portion of the tapered pipe 6 are appropriately set in consideration of the outer diameter of the short pipe 5 and the like. Further, the inner diameter and the outer diameter of the lower end portion of the tapered pipe 6 are appropriately set in consideration of the outer diameter of the vertical pipe 9 and the like.

  The downstream ends of the lateral branch pipes 7A and 7B are fitted into the branch pipes 3A and 3B of the collective joint 1, respectively.

  The joint structure 8 is inserted through a through-hole H formed in a concrete floor slab S interposed between floors adjacent in the vertical direction. Mortar M is filled between the side wall of the through hole H and the joint structure 8. In particular, the upper part of the collective joint 1, the short pipe 5, and the taper pipe 6 below the lower end of the branch pipe 3 is embedded in the mortar M.

  As shown in FIG. 2, the main pipe 2 of the collective joint 1 is provided at a cylindrical main body 12 having an axis J2 as a central axis, a fitting portion 14A provided at the upper end of the main body 12, and a lower end of the main body 12. And the engaged portion 16 provided on the side surface 12p of the main body 12.

  14 A of fitting parts are formed so that the standing tube 9A shown in FIG. 1 can be fitted inside. On the other hand, the fitting portion 14B is formed so that the short tube 5 can be fitted therein. In consideration of the thickness of the floor slab S shown in FIG. 1, the short pipe 5 is fitted into the fitting portion 14B with a predetermined length, and is fixed to the fitting portion 14B with an adhesive or the like, for example. . At the lower end of the short pipe 5 (that is, the end of the short pipe 5 opposite to the side where the main pipe 2 is connected), for example, a taper pipe 6 is externally fitted by an adhesive or the like. The short pipe 5 and the tapered pipe 6 are connected in a non-detachable state.

  As shown in FIGS. 2 and 3, the engaged portion 16 </ b> A includes a protruding portion 15 </ b> A protruding from the side surface 12 p of the main body 12 along the direction of the axis J <b> 3 </ b> A and a fitting provided at the tip of the protruding portion 15 </ b> A. 18A. The engaged portion 16B has a protruding portion 15B that protrudes from the side surface 12p of the main body 12 along the direction of the axis J3B, and a fitting portion 18B that is provided at the tip of the protruding portion 15B. The hollow portion of the projecting portion 15B and the hollow portion A18 of the fitting portion 18B communicate with the hollow portion of the main pipe 2.

  As shown in FIG. 3, the fitting portion 18B is formed in an annular shape with the axis line J3B as the central axis. Three annular grooves 20 are formed on the inner peripheral surface 18n of the fitting portion 18B at intervals from each other along the R3 direction (circumferential direction) centering on the axis line J3B. An insertion groove 24 extending from the annular groove 20 to the opening edge 22 of the fitting portion 18B along the axis J3B and opened to the opening edge 22 is formed at one end in the R3 direction of the annular groove 20 in plan view. Yes. At the other end of the annular groove 20 in the R3 direction, a fitting recess (recess) 26 is formed that is recessed toward the axis J2 (center side) of the main pipe 2 along the axis J3B in plan view.

  The fitting portion 18A is configured in the same manner as the fitting portion 18B, except that the axis line J3A is the central axis.

  As shown in FIG. 4, the branch pipe 3B is internally fitted to at least the fitting portion 18B shown in FIG. 3, and is formed in a cylindrical shape. In a state in which the branch pipe 3B is engaged with the main pipe 2 (hereinafter sometimes simply referred to as an engaged state), the branch pipe 3B on the side close to the main pipe 2 (that is, the base end side of the branch pipe 3B) is a protruding portion. It is formed in accordance with the shape of 15B.

  As shown in FIG. 4, in the engaged state, the branch pipe 3B far from the main pipe 2 (that is, the front end side of the branch pipe 3B) is expanded radially outward from the front end of the branch pipe 3B about the axis line J3B. A diameter flange portion 30 is provided. The inner diameter of the flange portion 30, that is, the diameter of the hollow portion A30 of the flange portion 30 is matched with the outer diameter of the side branch pipe 7B (see FIG. 1) fitted into the branch pipe 3B. An engaging portion 32 formed so as to be fitted in the fitting portion 18B is provided on the proximal end side of the branch pipe 3B from the flange portion 30 along the axis J3B. A bayonet claw 34 is provided on the outer peripheral surface 32r of the engaging portion 32 so as to protrude radially outward about the axis line J3B.

  The number of bayonet claws 34 is the same as the number of fitting recesses 26 in the R3 direction around the axis line J3B. The length of the bayonet claw 34 in the R3 direction is set to a length that allows the bayonet claw 34 to be fitted into the fitting recess 26 in consideration of the width of the fitting recess 26 in the R3 direction. Further, since the bayonet claw 34 can be fitted into the fitting recess 26, the relative positions of the engaged portion 16B and the engaging portion 32 are determined in the engaged state. That is, in the first embodiment, the engaged portion 16 and the engaging portion 32 can be relatively positioned by the bayonet structure (that is, the fitting structure of the bayonet claw 34 and the fitting recess 26). .

  In FIG. 4 etc., the three bayonet claws 34 are provided in the R3 direction. (One of the three bayonet claws 34 is not shown because it appears on the back side of the paper.) The number of bayonet claws 34 takes into account the size of the diameter of the hollow portion A18 shown in FIG. Although it is preferable to set appropriately, it is preferable that it is 2 or more and 4 or less, for example.

  If the outer diameter of the side branch pipe 7 (see FIG. 1) is substantially the same as the diameter of the hollow part A3 of the branch pipe 3B, the center of the hollow part A30 of the flange part 30 is aligned with the axis J3B as shown in FIG. overlapping. In particular, when the outer diameter of the lateral branch pipe 7 (see FIG. 1) is relatively smaller than the diameter of the hollow portion A3 of the branch pipe 3B, as shown in FIG. An opening 38 that is eccentric to the center is formed. In order to prevent the fluid flowing into the branch pipe 3B from passing through the inside of the side branch pipe 7B, in the engaged state, the height of the lower end of the hollow portion of the opening 38 is the hollow portion of the branch pipe 3B. It is preferably formed so as to be aligned with the height of the lower end of A3 or the lower end of the hollow portion of the side branch pipe 7B.

  From the viewpoint of easily realizing the engagement state as described above, the length in the R3 direction of the bayonet claw 34B in the vicinity of the lower end of the hollow portion of the opening 38 is the length in the R3 direction of the bayonet claw 34A other than the bayonet claw 34B. Are preferably different. In accordance with this, the width in the R3 direction of the fitting recess 26B in which the bayonet claw 34B is fitted is preferably different from the fitting recess 26A in which the bayonet claw 34A is fitted. In such a configuration, the bayonet claws 34A and 34B are simply fitted into the fitting recesses 26A and 26B, and the height of the lower end of the hollow portion of the opening 38 can be easily and reliably set to the hollow portion A3 of the branch pipe 3B. It is possible to align with the height of the lower end and the height of the lower end of the hollow portion of the lateral branch pipe 7B.

  The branch pipe 3A is configured in the same manner as the branch pipe 3B except that the axis J3A is the central axis.

  As shown in FIG. 6, a side branch pipe (tube material) 7 can be fitted to the distal end side of the branch pipe 3 (the side opposite to the side connected to the main pipe 2) along the directions of the axes J3A and J3B. It has the fitting part 28 comprised. The fitting portion 28 extends to the proximal end side of the flange portion 30 and the branch pipe 3. The fitting portion 28 is configured to be able to install an elastic member 42 between the side branch pipe 7. The elastic member 42 may be installed in the fitting part 28 in advance, or may be installed on the outer peripheral surface of the horizontal branch pipe 7 when the horizontal branch pipe 7 is fitted in the fitting part 28. If the elastic member 42 is installed in the fitting portion 28 in advance, it is possible to save the trouble of providing the elastic member 42 on the outer peripheral surface of the side branch pipe 7 during the insertion work of the side branch pipe 7, thereby improving work efficiency. 6 illustrates only one bayonet claw 34A, the annular groove 20, the insertion groove 24A, and the fitting recess 26A among the three bayonet claws 34, the annular groove 20, the insertion groove 24, and the fitting recess 26. The illustration of is omitted.

  As the elastic member 42, a known packing, rubber ring, or the like can be used, but it is not particularly limited as long as it can stop water between the branch pipe 3 and the lateral branch pipe 7.

  Further, a sealing member 40 is provided between the branch pipe 3 and the main pipe 2 in the engaged state. Specifically, the sealing member 40 is disposed between the wall surface 2s along the axis J2 of the main pipe 2 and the wall surface 3s of the branch pipe 3 facing the wall surface. The position of the sealing member 40 is not limited to the above position as long as the space between the branch pipe 3 and the main pipe 2 can be sealed. In addition, in FIG. 6, illustration of protrusion part 15A, 15B and fitting part 14A, 14B is abbreviate | omitted.

  As the sealing member 40, a known packing can be used, but it is not particularly limited as long as it has excellent water blocking properties and can seal between the branch pipe 3 and the main pipe 2.

  The collective joint 1, the short pipe 5, the tapered pipe 6, the side branch pipe 7 and the vertical pipe 9 are made of resin. Examples of the resin constituting these members include thermoplastic resins such as polyvinyl chloride resin and polypropylene resin. These members can be manufactured by a method such as injection molding. Furthermore, these members may be transparent. In particular, it is preferable that the branch pipe 3 is transparent because the insertion state of the side branch pipe can be observed from the outside.

  According to the collective joint 1 of the first embodiment described above, the branch pipe 3 is detachably provided to the main pipe 2 and can be connected to the main pipe 2 at a predetermined relative position in the R3 direction. Therefore, the branch pipe 3 suitable for the size and shape of the horizontal branch pipe 7 can be easily replaced. Further, when the diameter of the side branch pipe 7 is smaller than the diameter of the engaged portion 16 of the main pipe 2 and the diameter of the base end side of the branch pipe 3, the bottom end of the hollow portion of the side branch pipe 7 is engaged with the engaged end. The branch pipe 3 is eccentric with respect to the main pipe 2 so that the bottom end of the hollow part of the joint part 16 (or the bottom end of the hollow part on the base end side of the branch pipe 3) has substantially the same height. Can be linked in a state. Thereby, the drainage etc. which flow down the inside of the horizontal branch pipe 7, the branch pipe 3, and the main pipe 2 can be prevented from stagnation. By making the length of the bayonet claw 34B in the R3 direction different from the length of the bayonet claw 34A in the R3 direction, the engaged portion 16 and the engaging portion 32 in the R3 direction centering on the axis lines J3A, J3B of the branch pipe 3 Since the relative position is uniquely determined, the orientation, position, etc. of the branch pipe 3 with respect to the main pipe 2 can be appropriately and easily adjusted.

  Further, according to the collective joint 1 of the first embodiment, the bayonet claw 34 is inserted into the annular groove 20 through the insertion groove 24, the branch pipe 3 is rotated in the R3 direction around the axes J3A, J3B, and the bayonet claw By fitting 34 into the fitting recess 26, the branch pipe 3 can be easily connected to the main pipe 2 at a predetermined relative position. Further, the connection between the branch pipe 3 and the main pipe 2 can be released by moving the bayonet claw 34 from the fitting recess 26 to the annular groove 20 and removing it from the annular groove 20 via the insertion groove 24.

  Further, according to the collective joint 1 of the first embodiment, since the elastic member 42 can be installed between the fitting portion 28 and the lateral branch pipe 7, the lateral branch pipe 7 is fitted into the branch pipe 3. Even if the horizontal branch pipe 7 or the branch pipe 3 expands or contracts due to the temperature of the fluid (for example, drainage from the bath) flowing inside the horizontal branch pipe 7 or the branch pipe 3, for example, Expansion and contraction can be absorbed by the member 42 and the fitted state of the lateral branch pipe 7 can be maintained well. By installing the elastic member 42 in the branch pipe 3 in advance, the length necessary for connecting to the branch pipe 3 from a resin pipe or the like is cut off, and only inserted into the fitting portion 28 of the branch pipe 3, As described above, the influence of expansion and contraction of the horizontal branch pipe 7 and the branch pipe 3 can be suppressed, the fitting state of the horizontal branch pipe 7 can be maintained well, and the working efficiency can be increased. Of course, the elastic member 42 may be installed on the outer peripheral surface of the lateral branch pipe 7 when the lateral branch pipe 7 is fitted. Even in this case, the influence of the expansion and contraction of the lateral branch pipe 7 and the branch pipe 3 is suppressed. The insertion state can be maintained well, and the working efficiency can be increased.

  Moreover, according to the collective joint 1 of 1st embodiment, since the sealing member 40 is provided between the branch pipe 3 and the main pipe 2 in the engagement state, water-stopping property increases, and the branch pipe 3 and this main It is possible to reliably prevent fluid leakage from the connecting portion with the pipe 2.

(Second embodiment)
Next, the collective joint (joint) of the second embodiment to which the present invention is applied will be described. In addition, in the collective joint and drainage system component of the second embodiment, the same components as those of the collective joint 1 and drainage system of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The collective joint 1 according to the second embodiment includes a main pipe 2 and a branch pipe 3, and constitutes a joint structure 8 together with the short pipe 5 and the tapered pipe 6. The collective joint 1 is used in the drainage system shown in FIG.

  In the second embodiment, the engaged portion 16 and the engaging portion 32 can be relatively positioned by screw tightening. As shown in FIG. 8, the engagement portion 32 is formed with a threaded engagement surface 35 instead of the bayonet claw 34. The engaging surface 35 is configured by an outer peripheral surface 32 r of the engaging portion 32.

  As shown in FIG. 7, an engaged surface 50 in which a threaded engagement surface 35 is threadably engaged is provided on the inner peripheral surface 18n of the fitting portion 18B. The threaded length and width of the engaged surface 50 are such that the branch surface 3 is screwed into the innermost portion (that is, the center side of the main tube 2) in plan view while the engaging surface 35 is screwed into the engaged surface 50. In this state (screwing completion state), the main pipe 2 and the branch pipe 3 are appropriately set in a predetermined relative position in the R3 direction.

  According to the collective joint 1 of the second embodiment described above, the main pipe 2 is rotated while the branch pipe 3 is rotated along the axis lines J3A and J3B so that the engaging surface 35 is screwed to the engaged surface 50. By fitting into the fitting portion 28, the branch pipe 3 can be easily connected to the main pipe 2 at a predetermined relative position. Further, the connection between the branch pipe 3 and the main pipe 2 can be released by rotating the branch pipe 3 in the opposite direction to the connection with the main pipe 2.

  Since the collective joint 1 of the second embodiment has a screw-fastening structure instead of a bayonet structure, the same effect as the collective joint 1 of the first embodiment can be obtained according to the collective joint 1 of the second embodiment. . Moreover, in the collective joint 1 of 2nd embodiment, you may employ | adopt the modification similar to the collective joint 1 of 1st embodiment.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

  For example, in each of the above-described embodiments, as the collective joint 1, the branch pipes 3 </ b> A and 3 </ b> B including the hollow portion A <b> 30 are fitted to the plurality of engaged portions 16 included in the joint structure 8. For at least one of the parts 16, a lid member that does not have a hollow part may be fitted into the engaged part 16 of the joint structure 8 to close the engaged part 16 of the joint structure 8.

  In the above-described embodiments, the structure of the joint structure other than the part related to the present invention is simply shown. For example, a cover having a fireproof function and a sound insulation function is provided on part or all of the outer periphery of the joint structure 8. It may be. Further, a structure for rectifying the flow of the fluid that has flowed through the inside of the vertical pipe 9 or the side branch pipe 7 may be provided inside the joint structure 8.

1 ... Collective joint (joint)
2 ... main pipes 3, 3A, 3B ... branch pipes 16, 16A, 16B ... engaged portion 32 ... engaging portion

Claims (5)

A main pipe having an engaged portion on the outer peripheral surface;
A branch pipe having an engaging portion engageable with the engaged portion and configured to be detachable from the main pipe,
The relative positions of the engaged portion and the engaging portion are determined in the circumferential direction around the axis of the branch pipe in the engaged state between the engaged portion and the engaging portion. A joint characterized by The engaged portion and the engaging portion can be relatively positioned by a bayonet structure,
The engaging portion is provided with a bayonet claw,
An annular groove into which the bayonet claw can be inserted into the engaged portion, and a recess connected to the annular groove and recessed in the center of the main pipe along the axis in plan view, into which the bayonet claw fits The joint according to claim 1, wherein The engaged portion and the engaging portion can be relatively positioned by screw tightening,
The engagement portion is formed with a threaded engagement surface,
In the engaged portion, the engaged surface that can be brought into contact with the engaging surface can be screwed to the engaging surface, and the main pipe and the branch pipe are determined in the circumferential direction in the screwed state. The joint according to claim 1, wherein the joint is formed so as to be in the relative position.   The branch pipe has a fitting portion configured to fit a pipe material on a side opposite to the side connected to the main pipe, and an elastic member can be installed between the fitting portion and the pipe material. The joint according to any one of claims 1 to 3, wherein the joint is configured.   The joint according to any one of claims 1 to 4, wherein a sealing member is provided between the branch pipe and the main pipe in the engaged state.

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