JP7621922B2 - Pipe joint, piping structure using said pipe joint, and construction method of said piping structure - Google Patents

Description

The present invention relates to a pipe joint that connects at least three pipes, two upper and lower pipes and a horizontal branch pipe, which are mainly used for drainage piping in buildings, and in particular to a pipe joint that can easily align the pipe axis (axial core) of the part where the horizontal branch pipe is connected (horizontal branch pipe connection part) with the pipe axis (axial core) of the horizontal branch pipe even if they do not align, a piping structure using the pipe joint, and a construction method for the piping structure.

Apartment buildings, office buildings, and the like are equipped with water supply and drainage facilities. Of these, drainage facilities are well known as having a typical drainage piping structure with vertical pipes (standing pipes) that run vertically through each floor of the building, horizontal branch pipes installed on each floor, and pipe joints (manufacturing joints) that connect these. For example, in the case of drainage facilities connected to a wall-drained Western-style toilet, a horizontal branch pipe is connected to the drain outlet (receiving port) of the Western-style toilet, and the horizontal branch pipe is connected to the horizontal branch pipe connector of the pipe joint.

Recently, for example, when a toilet is changed due to indoor renovations, etc., there are cases where a change in the size and/or shape of the side branch pipe connected to the pipe fitting is required. Conventional pipe fittings are embedded in the floor slab and the main body of the pipe fitting is fixed. In addition, in many conventional pipe fittings, the side branch pipe connection part to which the side branch pipe is connected is formed integrally with the main body, or the side branch pipe connection part is connected to the main body in an undetachable manner using adhesives or the like. With such conventional pipe fittings, it is difficult to change the size and/or shape of the side branch pipe connection part. In other words, with such conventional pipe fittings, there is a problem that in order to change the specifications of the side branch pipe, major construction work is required, such as removing the pipe fitting embedded in the floor slab and re-embedding the pipe fitting with the changed side branch pipe connection part in the floor slab.

JP 2019-007306 A (Patent Document 1) discloses a joint that solves these problems. The joint disclosed in this Patent Document 1 comprises a main pipe having an engaged portion on its outer circumferential surface, and a branch pipe having an engaging portion that can engage with the engaged portion and configured to be detachable from the main pipe, and is characterized in that, when the engaged portion and the engaging portion are in an engaged state, the relative positions of the engaged portion and the engaging portion are determined in the circumferential direction centered on the axis of the branch pipe.

With this joint, 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 a branch pipe that matches the size and/or shape of the side branch pipe can be replaced.

JP 2019-007306 A

However, there are different specifications for the drain height (drain core height) of wall-drain Western-style toilets. In the case of wall-drain Western-style toilets, a side branch pipe is connected to the drain of the Western-style toilet, and the side branch pipe is connected to a pipe joint, but when remodeling to a Western-style toilet with a different height specification (this does not mean that the invention is limited to application during remodeling, but may be applied to new construction), there is a problem that the side branch pipe connected to the drain of the Western-style toilet cannot be connected to the pipe joint, that is, a problem caused by the misalignment of the pipe axis on the vertical line.

However, the pipe joint disclosed in Patent Document 1 cannot solve such problems. Although the above-mentioned problems are caused by the misalignment of the pipe axes on a vertical line, a problem of being unable to connect a side branch pipe to the pipe joint may also occur due to the misalignment of the pipe axes on a horizontal line.
The present invention was developed in consideration of the above-mentioned problems, and its object is to provide a pipe fitting that connects at least three pipes, namely two upper and lower pipes and a horizontal branch pipe, which can easily align the pipe axis of the part of the pipe fitting where the horizontal branch pipe is connected to the pipe axis of the horizontal branch pipe even if they do not coincide, a piping structure using this pipe fitting, and a construction method for this piping structure.

In order to achieve the above object, the pipe joint according to the present invention, the piping structure using the pipe joint, and the construction method for the piping structure employ the following technical means.
That is, a pipe joint according to one aspect of the present invention is a pipe joint for connecting at least three pipes, namely, two upper and lower pipes and a side branch pipe, and includes an upper pipe connection portion for connecting an upper pipe, a lower pipe connection portion for connecting a lower pipe, a side branch pipe connection portion provided between the upper pipe connection portion and the lower pipe connection portion in the vertical direction and for connecting a side branch pipe, and a side branch pipe connection member for connecting the side branch pipe connection portion and the side branch pipe, the side branch pipe connection member being detachably connected to the side branch pipe connection portion by a bayonet structure, The branch pipe connecting member has a circular tube shape with openings of different diameters at both ends, one of the openings with a larger diameter is connected to the horizontal branch pipe connecting portion, and the tube axis of the one opening does not coincide with the tube axis of the other opening, so that when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion using a bayonet structure, the tube axis of the other opening in the horizontal branch pipe connecting member is offset up and down on a vertical line passing through the tube axis of the horizontal branch pipe connecting portion or offset left and right on a horizontal line passing through the tube axis of the horizontal branch pipe connecting portion.

Preferably, the bayonet structure is configured such that the inner peripheral surface of the side branch pipe connecting portion is provided with a plurality of approximately L-shaped engaging grooves, the outer peripheral surface of the one opening of the side branch pipe connecting member is provided with a plurality of engaging protrusions that engage with the engaging grooves, and the side branch pipe connecting member is inserted into the side branch pipe connecting portion and rotated around the tube axis of the one opening, so that the engaging protrusions reach the end of the engaging groove and are positioned, and the side branch pipe connecting member is connected to the side branch pipe connecting portion, and the tube axis of the other opening of the side branch pipe connecting member is offset up and down on a vertical line passing through the tube axis of the side branch pipe connecting portion or offset left and right on a horizontal line passing through the tube axis of the side branch pipe connecting portion.

More preferably, the engagement grooves are provided in at least two pairs with the tube axis of the horizontal branch pipe connecting part as the center of symmetry, and the engagement grooves provided at the point-symmetrical positions are the same size, and the engagement protrusions are provided in at least two pairs with the tube axis of one of the openings in the horizontal branch pipe connecting member as the center of symmetry, and the engagement protrusions provided at the point-symmetrical positions are the same size, and there are sets with different sizes of the engagement grooves and the engagement protrusions, so that when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting part by a bayonet structure, the tube axis of the other opening in the horizontal branch pipe connecting member can be selected to be eccentric upward or downward on a vertical line passing through the tube axis of the horizontal branch pipe connecting part.

More preferably, the engagement grooves can be configured so that the ends of at least one set of the engagement grooves are located on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion, and the engagement protrusions can be configured so that when the pipe axis of the other opening in the horizontal branch pipe connecting member is eccentric upward, at least one set of the engagement protrusions are located on a vertical line passing through the pipe axis of one of the openings.
More preferably, the engagement groove and the engagement protrusion are arranged in at least two sets with the tube axis as the center of point symmetry, with one set being arranged in a horizontal position and the other set being arranged in a vertical position, and the size of the engagement groove is larger at the horizontal position than at the vertical position, and the size of the engagement protrusion is larger at the horizontal position than at the vertical position, or the size of the engagement groove is smaller at the horizontal position than at the vertical position, and the size of the engagement protrusion is smaller at the horizontal position than at the vertical position.

More preferably, the engagement grooves are arranged in a set of two vertically positioned with the pipe axis of the horizontal branch pipe connecting part as the center of symmetry, and the two engagement grooves are the same size, and the engagement protrusions are arranged in a set of two vertically positioned with the pipe axis of one of the openings in the horizontal branch pipe connecting member as the center of symmetry, and the two engagement protrusions are the same size.
More preferably, the engaging grooves are arranged in a set of two horizontally positioned with the pipe axis of the horizontal branch pipe connecting part as the center of symmetry, and the two engaging grooves are the same size, and the engaging protrusions are arranged in a set of two horizontally positioned with the pipe axis of one of the openings in the horizontal branch pipe connecting member as the center of symmetry, and the two engaging protrusions are the same size.

A piping structure according to another aspect of the present invention is a piping structure using any one of the pipe joints described above.
Furthermore, an installation method according to yet another aspect of the present invention is a method for installing the above-mentioned piping structure, comprising the steps of: before connecting the horizontal branch pipe connecting member to the horizontal branch pipe connecting portion by a bayonet structure, determining whether it is necessary to align the pipe axis of the horizontal branch pipe with the pipe axis of the horizontal branch pipe connecting portion when the pipe axis does not coincide with the pipe axis of the horizontal branch pipe connecting portion in a top or side view; if it is determined that it is necessary to align the pipe axis of the other opening, determining whether to offset the pipe axis of the other opening in the horizontal branch pipe connecting member in a top or bottom or left or right direction; and connecting the horizontal branch pipe connecting member to the horizontal branch pipe connecting portion by a bayonet structure such that when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion, the pipe axis of the other opening in the horizontal branch pipe connecting member is offset up and down on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion or offset left and right on a horizontal line passing through the pipe axis of the horizontal branch pipe connecting portion.

The present invention provides a pipe fitting that connects at least three pipes, two upper and lower pipes and a horizontal branch pipe, and that can easily align the pipe axis of the part of the pipe fitting where the horizontal branch pipe is connected with the pipe axis of the horizontal branch pipe even if they do not align, as well as a piping structure that uses the pipe fitting and a construction method for the piping structure.

1A to 1C are diagrams for explaining problems solved by a pipe joint 10 according to an embodiment of the present invention. FIG. 2 is a five-view diagram showing the piping of the drainage piping structure 1002U and the drainage piping structure 1002D shown in FIG. FIG. 2 is a five-view diagram showing the piping of the drainage piping structure 1004U and the drainage piping structure 1004D shown in FIG. FIG. 5 is a five-view diagram showing piping of a drainage piping structure 1005U and a drainage piping structure 1005D different from those of FIG. 2 and FIG. 3. 1A is a perspective view of an upper eccentric pipe joint 10U in which the pipe joint 10 according to the embodiment of the present invention is eccentric to the upper side, and FIG. 1A is a perspective view of a lower eccentric pipe joint 10D in which the pipe joint 10 according to the embodiment of the present invention is eccentric downward, and FIG. 1A and 1B are two-sided views of a pipe joint body 100 constituting a pipe joint 10 according to an embodiment of the present invention. 2 is a two-sided view of a lateral branch pipe connecting member 140 constituting a pipe joint 10 according to an embodiment of the present invention. FIG. 1A is a diagram for explaining a procedure for causing upward eccentricity in a pipe fitting 10 according to an embodiment of the present invention, and FIG. 1B is a diagram for explaining a procedure for causing downward eccentricity in the pipe fitting 10 according to an embodiment of the present invention. 9(A) and a diagram showing an engagement groove and an engagement protrusion (engagement claw) of the bayonet structure in FIG. 9(A). FIG. 9(B) and a diagram showing an engagement groove and an engagement protrusion (engagement claw) of the bayonet structure in FIG. 9(B). FIG. 1A to 1C are diagrams for explaining a pipe joint 10 according to an embodiment of the present invention, which is capable of being eccentric up and down but not eccentric to the left and right. FIG. 2 is a schematic diagram showing the relationship between an engagement groove and an engagement protrusion (engagement claw) of a bayonet structure in a pipe joint according to an embodiment (basic form) of the present invention. 11 is a schematic diagram showing the relationship between an engagement groove and an engagement protrusion (engagement claw) of a bayonet structure in a pipe joint according to a first modified example of an embodiment of the present invention. FIG. 13 is a schematic diagram showing the relationship between an engagement groove and an engagement protrusion (engagement claw) of a bayonet structure in a pipe joint according to a second modified example of an embodiment of the present invention. FIG. 13 is a schematic diagram showing the relationship between an engagement groove and an engagement protrusion (engagement claw) of a bayonet structure in a pipe joint according to a third modified example of an embodiment of the present invention. FIG.

The following describes in detail the pipe fitting 10 according to an embodiment of the present invention, the piping structure using the pipe fitting 10, and the construction method of the piping structure with reference to Figures 1 to 16. In the following description, the pipe fitting 10 will be described first, followed by the construction method, and finally the pipe fitting according to the modified embodiment of the present invention. The piping structure constructed by the construction method according to the present embodiment (for example, as shown in Figures 1 to 4) is the piping structure according to the present embodiment. In addition, the state in which the pipe fitting 10 according to the present embodiment is eccentric to the upper side may be referred to as the upper eccentric pipe fitting 10U, and the state in which it is eccentric to the lower side may be referred to as the lower eccentric pipe fitting 10D. In addition, the vertical direction and the up-down direction, and the horizontal direction and the left-right direction have the same meaning, so they may be described without distinguishing between them. Furthermore, there are cases where no explanation is given for publicly known technology relating to the structure and function of the bayonet structure itself (for example, the bayonet structure itself described in Patent Document 1), and the engagement groove in the bayonet structure is sometimes simply referred to as a groove, and the engagement protrusion that engages with the engagement groove is sometimes referred to as an engagement claw or simply as a claw.

First, with reference to FIG. 1, a problem to be solved by a pipe joint 10 according to the present embodiment will be described.
Fig. 1 is a side view of a drainage piping structure using a pipe joint 10 according to the present embodiment for connecting a wall-draining type Western-style toilet. The upper two figures in Fig. 1 are drainage piping structures 1002U and 1002D further including a pipe joint 1022 (separate from the pipe joint 10) having a horizontal branch pipe connection between a pipe joint buried in a floor slab and the pipe joint 10 according to the present embodiment (as also shown in Fig. 2), and the lower two figures in Fig. 1 are drainage piping structures 1004U and 1004D not including a pipe joint 1022 having a horizontal branch pipe connection in the drainage piping structures 1002U and 1002D (as also shown in Fig. 3). In addition, five-sided views showing the piping of the drainage piping structures 1002U and 1002D shown in Fig. 1 are shown in Fig. 2, and five-sided views showing the piping of the drainage piping structures 1004U and 1004D shown in Fig. 1 are shown in Fig. 3.

As mentioned above, there are different height dimensions for the drain height (drain core height) of wall-drain type Western-style toilets. The two diagrams on the left side of Figure 1 are for Western-style toilets with the receiving port (drain core) on the upper side (Western-style toilet wall drain height H(1) = 155 mm specification), and the two diagrams on the right side of Figure 1 are for Western-style toilets with the receiving port (drain core) on the lower side (Western-style toilet wall drain height H(2) = 120 mm specification).

In the present embodiment, one type of pipe fitting 10 is used in these four cases to connect the Western-style toilet to the pipe fitting 10 via a horizontal branch pipe 1030 (which is slightly inclined downward toward the drainage direction). Here, although not limited to this pipe fitting 10, the position of the pipe axis of the horizontal branch pipe connection part can be changed in the vertical direction (up and down) by 35 mm (as a variable length), which is the difference between 155 mm and 120 mm. Note that the variable length of 35 mm is merely one example (it could be 30 mm, etc.).

The drainage piping structure 1002U and drainage piping structure 1004U on the left side of Figure 1 show structures using an upper eccentric pipe joint 10U in which the horizontal branch pipe connection part of the pipe joint 10 is eccentric to the upper side, corresponding to the case where the receiving port (drainage core) of the Western-style toilet is on the upper side (H(1) = 155 mm), and the drainage piping structure 1002D and drainage piping structure 1004D on the right side of Figure 1 show structures using a lower eccentric pipe joint 10D in which the horizontal branch pipe connection part of the pipe joint 10 is eccentric to the lower side, corresponding to the case where the receiving port (drainage core) of the Western-style toilet is on the lower side (H(2) = 120 mm).

The pipe joint according to the present invention is not limited to a pipe joint in which the position of the pipe axis can be changed in the vertical direction (up and down direction), but may be a pipe joint in which the position of the pipe axis can be changed in the horizontal direction (left and right direction).
As shown in FIG. 2, the pipe fitting 10 of this embodiment may be employed in a drainage piping structure 1002U and a drainage piping structure 1002D that include a pipe fitting 1022 (separate from the pipe fitting 10) having a horizontal branch pipe connection portion between a pipe fitting 1024 buried in a floor slab and the pipe fitting 10 of this embodiment, and as shown in FIG. 3, the pipe fitting 10 of this embodiment may be employed in a drainage piping structure 1004U and a drainage piping structure 1004D that do not include a pipe fitting 1022 having a horizontal branch pipe connection portion in the drainage piping structure 1002U and the drainage piping structure 1002D.

In addition to the pipe fitting 10 of this embodiment, Figures 2 and 3 also show an upper pipe 1010, a lower pipe 1020, a pipe fitting 1022 (separate from the pipe fitting 10) having a horizontal branch pipe connection portion, a pipe fitting 1024 buried in the floor slab, and a pipe 1026 connected below the pipe fitting 1024.
Furthermore, as shown in Fig. 4, the pipe fitting according to the present invention may be a pipe fitting 11 that is integrally provided with a side branch pipe connecting part that is separate from the side branch pipe connecting part that can be vertically eccentric. Fig. 4(A) shows a drainage piping structure 1005U employing an upper eccentric pipe fitting 11U in which the side branch pipe connecting part of the pipe fitting 11 is eccentric to the upward side, and Fig. 4(B) shows a drainage piping structure 1005D employing a lower eccentric pipe fitting 11D in which the side branch pipe connecting part of the pipe fitting 11 is eccentric to the downward side.

Although this pipe joint 11 has three lateral branch pipe connection parts and only one lateral branch pipe connection part at the top that can be vertically eccentric is provided, the present invention is not limited to this. The pipe joint according to the present invention may be a pipe joint that connects at least three pipes, i.e., two upper and lower pipes and a lateral branch pipe, and the number of lateral branch pipes to be connected may be multiple as shown in Fig. 4 (three in Fig. 4), and furthermore, since it is sufficient that at least one of the lateral branch pipe connection parts connecting the multiple lateral branch pipes is vertically eccentric, all three lateral branch pipe connection parts of the pipe joint 11 shown in Fig. 4 can be vertically eccentric.
In the following, a description will be given of the pipe joint 10 employed in the drainage piping structure shown in Fig. 3. In the following description, the pipe joint 10 that is vertically eccentric and not horizontally eccentric will be mainly described, but as described above and below, the present invention includes pipe joints that are vertically eccentric and horizontally eccentric.

[Pipe fittings]
A pipe joint 10 according to the present embodiment will be described with reference to FIGS.
First, the general structure of the pipe fitting 10 will be described with reference to Figure 5, which shows an upper eccentric pipe fitting 10U in which the pipe fitting 10 in this embodiment is eccentric to the upper side, Figure 6, which shows a lower eccentric pipe fitting 10D in which the pipe fitting 10 is eccentric to the lower side, Figure 7, which shows a pipe fitting main body 100 that constitutes the pipe fitting 10, and Figure 8, which shows a lateral branch pipe connecting member 140 that constitutes the pipe fitting 10.

As described above, this pipe fitting 10 is a pipe fitting that connects at least three pipes, two upper and lower pipes (upper pipe 1010 and lower pipe 1020) and a side branch pipe (side branch pipe 1030 shown in FIG. 1 but not shown in FIG. 5 and FIG. 6). This pipe fitting 10 includes an upper pipe connection part 110 that connects the upper pipe 1010, a lower pipe connection part 120 that connects the lower pipe 1020, a side branch pipe connection part 130 that is provided between the upper pipe connection part 110 and the lower pipe connection part 120 in the vertical direction and connects the side branch pipe 1030, and a side branch pipe connection member 140 that connects the side branch pipe connection part 130 and the side branch pipe 1030. The upper pipe connection part 110, the lower pipe connection part 120, and the side branch pipe connection part 130 (which are separate members from the side branch pipe connection member 140) constitute a pipe fitting main body 100 that is integrally formed. In addition, a watertight gasket 150 is sandwiched between the side branch pipe connection part 130 and the side branch pipe connection member 140.

Note that the upper pipe connection part 110 and the lower pipe connection part 120 only need to be able to be connected to the upper pipe 1010 and the lower pipe 1020, respectively. Since the structures of the upper pipe connection part 110 and the lower pipe connection part 120 are not directly related to the present invention, the structures (shapes) of the upper pipe connection part 110 and the lower pipe connection part 120 may not be consistent in the figures (for example, the perspective view and the plan view shown in FIG. 7).

The horizontal branch pipe connecting member 140 is detachably connected to the horizontal branch pipe connecting section 130 by a bayonet structure. As shown in FIG. 8, the horizontal branch pipe connecting member 140 has a circular pipe shape with openings of different diameters at both ends, and one large opening 144 with a larger diameter is connected to the horizontal branch pipe connecting section 130, and the tube axis of one large opening 144 and the tube axis of the other small opening 146 do not coincide as shown in FIG. 8(C). When the horizontal branch pipe connecting member 140 is connected to the horizontal branch pipe connecting section 130 by the bayonet structure, as shown in FIG. 5 and FIG. 6, the tube axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is eccentric up and down on a vertical line passing through the tube axis of the horizontal branch pipe connecting section 130 or eccentric left and right on a horizontal line passing through the tube axis of the horizontal branch pipe connecting section.

As a part of this bayonet structure, as shown in FIG. 7, a plurality of (four in this case) approximately L-shaped engagement grooves 132 are provided on the inner surface of the lateral branch pipe connection portion 130, and as shown in FIG. 8, a plurality of (four in this case) engagement protrusions 142 that engage with the engagement grooves 132 are provided on the outer surface of one of the large openings 144 in the lateral branch pipe connection member 140. As shown in Figures 5 and 6, the horizontal branch pipe connecting member 140 is inserted into the horizontal branch pipe connecting section 130 (the engagement protrusion 142 is inserted into the starting end 132S of the engagement groove 132), and rotated around the tube axis of one of the large openings 144 in the horizontal branch pipe connecting member 140 (by rotating in the direction of arrow R shown in Figures 10 and 11 described below), so that the engagement protrusion 142 reaches the end 132E of the engagement groove 132 from the starting end 132S shown in Figure 7 and is positioned, and the horizontal branch pipe connecting member 140 is connected to the horizontal branch pipe connecting section 130, so that the tube axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset up and down on a vertical line passing through the tube axis of the horizontal branch pipe connecting section 130, or offset left and right on a horizontal line passing through the tube axis of the horizontal branch pipe connecting section 130.

Here, in the bayonet structure shown in the figure, although the number and positions are just an example, engagement grooves 132 are provided in four locations in the up, down, left, and right directions, and engagement protrusions 142 that engage with engagement grooves 132 are provided in four locations in the up, down, left, and right directions. By making engagement grooves 132B and engagement protrusions 142B in the left and right directions larger than engagement grooves 132A and engagement protrusions 142A in the up and down direction, it is possible to allow vertical decentering but not horizontal decentering, but it is possible to allow vertical decentering and horizontal decentering by making all four locations the same size.
The case in which the pipe joint 10 according to this embodiment is capable of vertical eccentricity but not horizontal eccentricity will be described in more detail below.

At least two pairs of engagement grooves 132 are provided (here, two pairs) with the pipe axis of the horizontal branch pipe connection part 130 as the center of symmetry, and the engagement grooves 132 provided at the point symmetrical positions are the same size. In detail, as shown in FIG. 7, the left engagement groove 132B and the right engagement groove 132B are provided as one pair with the same size with the pipe axis of the horizontal branch pipe connection part 130 as the center of symmetry, and the upward engagement groove 132A and the downward engagement groove 132A are provided as one pair with the same size with point symmetry, for a total of two pairs of engagement grooves 132. That is, one of at least two pairs (here, two pairs) of engagement grooves 132 provided with the pipe axis of the horizontal branch pipe connection part 130 as the center of symmetry is provided in a horizontal position (left-right direction), and the other of the two pairs is provided in a vertical position (up-down direction).

At least two pairs of engagement protrusions 142 are provided (here, two pairs) with the tube axis of one large opening 144 in the horizontal branch pipe connecting member 140 as the center of symmetry, and the engagement protrusions 142 provided at the point symmetrical positions are the same size. In detail, as shown in FIG. 8, the upper engagement protrusion 142A and the lower engagement protrusion 142A are provided as one pair with the same size with the tube axis of one large opening 144 in the horizontal branch pipe connecting member 140 as the center of symmetry, and the left engagement protrusion 142B and the right engagement protrusion 142B are provided as one pair with the same size with point symmetry. That is, of at least two pairs (here, two pairs) of engagement protrusions 142 provided with the tube axis of one large opening 144 in the horizontal branch pipe connecting member 140 as the center of symmetry, one pair is provided in a horizontal position (left-right direction), and the other pair is provided in a vertical position (up-down direction).

There are pairs of engagement grooves 132 and engagement protrusions 142 with different sizes. Here, the size of one pair of engagement grooves 132B and engagement protrusions 142B in the left-right direction is larger than the size of one pair of engagement grooves 132A and engagement protrusions 142A in the up-down direction.
It is not possible to engage a set of engagement protrusions 142B in the left-right direction with a set of engagement grooves 132A in the up-down direction (it is not possible to insert the engagement protrusions 142 into the starting ends 132S of the engagement grooves 132). Note that, here, the engagement grooves and engagement protrusions are arranged in pairs in point symmetry, and there are two such sets of point symmetry, and the different sets have different sizes, but since there are sets with different sizes of engagement grooves and engagement protrusions, it is also possible that there are three such sets of point symmetry, and one of the sets has a different size from the other two sets (these two sets have the same size).

Here, the different sizes of the engagement groove and the engagement protrusion refer to the circumferential length of the inlet portion 132S of the engagement groove 132 and the circumferential length of the engagement protrusion 142, but the present invention is not limited to the sizes of these parts. For example, if the groove width in the tube axis direction other than the inlet portion 132S of the engagement groove 132 and the thickness in the tube axis direction of the engagement protrusion 142 are different, the engagement protrusion 142 cannot be fitted into the engagement groove 132, so such sizes in the tube axis direction (groove width, protrusion thickness) are acceptable, and the sizes of other parts may also be different.
Therefore, when the horizontal branch pipe connecting member 140 is connected to the horizontal branch pipe connecting section 130 using a bayonet structure, the pipe axis of the other small opening in the horizontal branch pipe connecting member 140 can be selected to be either eccentric upward (upper eccentric pipe joint 10U shown in Figure 5) or eccentric downward (lower eccentric pipe joint 10D shown in Figure 6) on a vertical line passing through the pipe axis of the horizontal branch pipe connecting section 130.

Although the size of the engagement grooves 132 is larger in the horizontal position (left-right direction) than in the vertical position (up-down direction) and the size of the engagement protrusions 142 is larger in the horizontal position (left-right direction) than in the vertical position (up-down direction) in the above description, the size of the engagement grooves 132 may be smaller in the horizontal position (left-right direction) than in the vertical position (up-down direction) and the size of the engagement protrusions 142 may be smaller in the horizontal position (left-right direction) than in the vertical position (up-down direction) in the opposite manner. In this case, it is not possible to engage a set of engagement protrusions 142 in the vertical direction with a set of engagement grooves 132 in the horizontal direction (inserting the engagement protrusions 142 into the starting ends 132S of the engagement grooves 132), so that vertical eccentricity is possible but horizontal eccentricity is not possible.
A method of constructing a piping structure using the pipe joint 10 according to this embodiment having the above-described structure will be described in detail below with reference to FIGS.

[Installation method]
- Determination step: First, before connecting the lateral branch pipe connecting member 140 to the lateral branch pipe connecting section 130 using a bayonet structure, it is determined whether or not it is necessary to align the tube axis of the lateral branch pipe 1030 with the tube axis of the lateral branch pipe connecting section 130 when the tube axis does not coincide with the tube axis of the lateral branch pipe 1030 in a top or side view.
As described above, the pipe joint according to the present invention does not exclude vertical and horizontal eccentricity, but since the main purpose is to achieve vertical eccentricity as shown in Fig. 1, horizontal eccentricity will not be taken into consideration in the description of the next step and subsequent steps of this construction method. In this determination step, if the pipe axis of the horizontal branch pipe 1030 does not coincide with the pipe axis of the horizontal branch pipe connecting part 130 in a top view and it is necessary to make them coincident, it is sufficient to use a vertically eccentric and horizontally eccentric pipe joint in which the above-mentioned four engagement grooves 132 and engagement protrusions 142 are all the same size, and to determine whether the pipe axis is to be eccentric to the left or right, and to connect the horizontal branch pipe connecting member 140 to the horizontal branch pipe connecting part 130 by a bayonet structure so that the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is eccentric to the left or right on a horizontal line passing through the pipe axis of the horizontal branch pipe connecting part 130 when the horizontal branch pipe connecting member 140 is connected to the horizontal branch pipe connecting part 130.

Next, if it is determined that the two need to be aligned, it is determined whether the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 should be offset upward or downward. For example, as in the left-hand side of FIG. 1, when the receiving port (drainage center) of the Western-style toilet is on the upper side (Western-style toilet wall drain height H(1) = 155 mm specification), the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset upward, and when the receiving port (drainage center) of the Western-style toilet is on the lower side (Western-style toilet wall drain height H(2) = 120 mm specification), as in the right-hand side of FIG. 2, the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset downward.

Connection step: Next, a watertight gasket 150 is sealed in so that when the horizontal branch pipe connecting member 140 is connected to the horizontal branch pipe connecting section 130, the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset upward or downward on a vertical line passing through the pipe axis of the horizontal branch pipe connecting section 130, and the horizontal branch pipe connecting member 140 is connected to the horizontal branch pipe connecting section 130 using a bayonet structure.
At this time, when the center is to be offset upward on a vertical line, construction is performed as shown in FIG. 9(A) and FIG.

(9A1) The other small opening 146 in the horizontal branch pipe connecting member 140 is positioned approximately on the upper side, (9A2) the horizontal branch pipe connecting member 140 is inserted into the horizontal branch pipe connecting section 130 (the engagement protrusion 142 is inserted into the start end 132S of the engagement groove 132), and (9A3) the horizontal branch pipe connecting member 140 is rotated in the direction of arrow R around the pipe axis of one large opening 144 in the horizontal branch pipe connecting member 140, so that the engagement protrusion 142 reaches from the start end 132S to the end end 132E of the engagement groove 132 shown in Fig. 7. At this time, the horizontal branch pipe connecting member 140 is positioned and connected to the horizontal branch pipe connecting section 130, and the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset upward on a vertical line passing through the pipe axis of the horizontal branch pipe connecting section 130.
At this time, when the center is to be offset downward on the vertical line, construction is performed as shown in FIG. 9(B) and FIG.

(9B1) The other small opening 146 in the horizontal branch pipe connecting member 140 is positioned approximately downward, (9B2) the horizontal branch pipe connecting member 140 is inserted into the horizontal branch pipe connecting section 130 (the engagement protrusion 142 is inserted into the start end 132S of the engagement groove 132), and (9B3) the horizontal branch pipe connecting member 140 is rotated in the direction of arrow R around the pipe axis of one of the large openings 144 in the horizontal branch pipe connecting member 140, so that the engagement protrusion 142 reaches from the start end 132S to the end end 132E of the engagement groove 132 shown in FIG. 7. At this time, the horizontal branch pipe connecting member 140 is positioned and connected to the horizontal branch pipe connecting section 130, and the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset downward on a vertical line passing through the pipe axis of the horizontal branch pipe connecting section 130.

As described above, the bayonet connection is achieved by rotating the lateral branch pipe connecting member 140 in the direction of arrow R (clockwise) around the tube axis of one of the large openings 144 in the lateral branch pipe connecting member 140. However, if the engagement groove 132 and the engagement protrusion are changed to positions that are linearly symmetrical with respect to the vertical or horizontal axis, the bayonet connection can also be achieved by rotating in the opposite direction of arrow R (counterclockwise). In other words, by changing the positions of the engagement groove 132 and the engagement protrusion, bayonet connection is possible in either rotation direction (the direction of arrow R (clockwise), the opposite direction of arrow R (counterclockwise)).

In this construction method, in the pipe fitting 10 according to the present embodiment, as shown in FIG. 12(A), the size of the engagement groove 132 is set so that the engagement groove 132B in the horizontal position (left-right direction) is larger than the engagement groove 132A in the vertical position (up-down direction), and as shown in FIG. 12(B), when the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is offset upward (the same applies when it is offset downward due to symmetry), the size of the engagement protrusion 142 is set so that the engagement protrusion 142B in the horizontal position (left-right direction) is larger than the engagement protrusion 142A in the vertical position (up-down direction). Therefore, as shown in FIG. 12(B), vertical offset is possible, but as shown in FIG. 12(C), left-right offset is not possible because the larger engagement protrusion 142B cannot be inserted into the start end 132S of the smaller engagement groove 132A.

When installed in this manner, the pipe joint 10 according to the present embodiment has the following structure, and therefore the installation work is easy.
The engagement grooves 132 provided in the lateral branch pipe connection portion 130 of the pipe fitting main body 100 constituting the pipe fitting 10 are such that the end 132E of at least one set (here, one set) of engagement grooves 132 is located on a vertical line passing through the pipe axis of the lateral branch pipe connection portion 130, as shown by dotted lines in Figures 10 (C) and 11 (C).

As shown in Figure 8 (D) , when the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 that constitutes the pipe fitting 10 is offset upward (the same applies if it is offset downward due to symmetry), at least one set (one set here) of engaging protrusions 142 is located on a vertical line passing through the pipe axis of one large opening 144 in the horizontal branch pipe connecting member 140.
Due to this structure, when connected using a bayonet structure (when the engagement protrusion 142 reaches from the starting end 132S to the ending end 132E of the engagement groove 132 shown in Figure 7), the tube axis of the other small opening 146 in the horizontal branch pipe connecting member 140 is positioned at the uppermost or lowermost side.

Furthermore, an L-shaped arrow 138M is provided on the outer peripheral surface 138 of the horizontal branch pipe connection part 130, corresponding to the position of the upper engagement groove 132A among the multiple (four locations in this case) generally L-shaped engagement grooves provided on the inner peripheral surface of the horizontal branch pipe connection part 130. A start position 138MS, which is a position other than the tip of the arrow, of this L-shaped arrow 138M matches the position of the start end 132S of the engagement groove 132, and an end position 138ME, which is the position of the tip of the arrow, matches the position of the end 132E of the engagement groove 132. Furthermore, triangular marks 148M are provided on the maximum outer periphery 148 of one of the large openings 144 in the side branch pipe connecting member 140 (at two locations above and below) corresponding to the position of the shortest engagement protrusion 142A and the position of the longest fitting protrusion 142A (the shortest and longest shown in Figure 8 (D)) among the multiple (four here) engagement protrusions 142 provided on the maximum outer periphery 148 of one of the large openings 144 in the side branch pipe connecting member 140.

Therefore, the triangular mark 148M is aligned with the starting position 138MS of the L-shaped arrow 138M, and the horizontal branch pipe connecting member 140 is rotated in the direction of arrow R around the pipe axis of one of the large openings 144 in the horizontal branch pipe connecting member 140 to the end position 138ME of the L-shaped arrow 138M (rotated until the triangular mark 148M is aligned with the end position 138ME of the L-shaped arrow 138M), so that the engagement protrusion 142 reaches the end 132E from the starting end 132S of the engagement groove 132 shown in FIG. 7. At this time, the horizontal branch pipe connecting member 140 is positioned and connected to the horizontal branch pipe connecting section 130, and the pipe axis of the other small opening 146 in the horizontal branch pipe connecting member 140 can be offset upward or downward on a vertical line passing through the pipe axis of the horizontal branch pipe connecting section 130. In this way, the pipe joint 10 according to this embodiment has favorable workability.

As described above, the pipe fitting of this embodiment, the piping structure using this pipe fitting, and the installation method for this piping structure are a pipe fitting that connects at least three pipes, two upper and lower pipes and a horizontal branch pipe, and even if the pipe axis of the part of the pipe fitting where the horizontal branch pipe is connected does not coincide with the pipe axis of the horizontal branch pipe, the pipe fitting can easily be made to coincide.
Finally, a first modified example, a second modified example, and a third modified example of the embodiment of the present invention will be described with reference to Figures 13 to 16. To facilitate understanding of the three modified examples, Figure 13 is a diagram showing the (basic) relationship between the engagement groove and the engagement claw (engagement protrusion) in the pipe joint 10 (which can be vertically eccentric but not horizontally eccentric) according to the embodiment described above. Here, in Fig. 13(A), the size of the engagement groove (sometimes simply referred to as groove) is larger in the horizontal position (left-right direction: suffixes 2, 4) than in the vertical position (up-down direction: suffixes 1, 3) (Groove 1 = Groove 3 < Groove 2 = Groove 4), and the size of the engagement protrusion (sometimes simply referred to as claw) is larger in the horizontal position (left-right direction) than in the vertical position (up-down direction) (Claw 1 = Claw 3 < Claw 2 = Claw 4), while Fig. 13(B) is the opposite of Fig. 13(A), in that the size of the engagement groove is smaller in the horizontal position (left-right direction) than in the vertical position (up-down direction) (Groove 1 = Groove 3 > Groove 2 = Groove 4), and the size of the engagement claw is smaller in the horizontal position (left-right direction) than in the vertical position (up-down direction) (Claw 1 = Claw 3 > Claw 2 = Claw 4). The three modified examples shown below are pipe joints that are vertically eccentric but not horizontally eccentric, just like the basic type shown in Fig. 13.

[First Modification]
The positions and number of grooves and claws of a pipe joint according to a first modification will be described with reference to Fig. 14. In this first modification, there are two pairs of grooves with the pipe axis of the horizontal branch pipe connecting part 130 as the center of symmetry, and two pairs of claws with the pipe axis of the horizontal branch pipe connecting part 130 as the center of symmetry, and some pairs have different sizes of grooves and claws (here, there are only two pairs, so the sizes of the grooves and claws differ for different pairs). This is the same as the grooves and claws in the pipe joint 10 according to the above-mentioned embodiment, but it is different in that the positions of the grooves and claws are not arranged up, down, left, and right. In this first modification, as in Figs. 13(A) and 13(B), in Fig. 14(A), groove 1 = groove 3 < groove 2 = groove 4, and claw 1 = claw 3 < claw 2 = claw 4, and in Fig. 14(B), the opposite of Fig. 14(A), groove 1 = groove 3 > groove 2 = groove 4, and claw 1 = claw 3 > claw 2 = claw 4. However, since the grooves and claws are not provided at equal intervals up, down, left, and right as in the pipe fitting 10 of the embodiment described above, even if the grooves and claws are all the same size, it is possible to achieve the characteristic that upper eccentricity and lower eccentricity can be selectively performed without allowing left and right eccentricity.

[Second Modification]
The positions and numbers of grooves and claws of a pipe joint according to a second modified example will be described with reference to Fig. 15. In this second modified example, in addition to two pairs of grooves each having a point symmetric center about the pipe axis of the horizontal branch pipe connecting part 130 shown in Fig. 13(A) and two pairs of claws each having a point symmetric center about the pipe axis of the horizontal branch pipe connecting part 130, the sizes of the grooves and claws differing between different pairs (Groove 1 = Groove 3 < Groove 2 = Groove 4, and Claw 1 = Claw 3 < Claw 2 = Claw 4), four more grooves (Groove 5, Groove 6, Groove 7, Groove 8) and four claws (Claw 5, Claw 6, Claw 7, Claw 8) are provided.

Here, it should be noted that as long as the basic shape shown in FIG. 13(A) is satisfied, the size of grooves 5 to 8 is not limited as long as it matches the claws 5 to 8, and even if grooves 5 to 8 and claws 5 to 8 are all the same size, grooves 5 to 8 and claws 5 to 8 must be positioned with the tube axis of the horizontal branch pipe connection part 130 as the center of point symmetry (point symmetrical position about the tube axis center) in order for them to be eccentric up and down (in addition to not being able to be eccentric to the left and right, which is impossible in the basic shape). In other words, even if the sizes of these four are the same, grooves 5 to 8 and claws 5 to 8 must be positioned in point symmetrical positions about the tube axis center.

Furthermore, it should be noted that, while satisfying the relationship Groove 1 = Groove 3 < Groove 2 = Groove 4 shown in the basic form in Figure 13 (A), if grooves 5 to 8 and claws 5 to 8 are not all the same size as described above, the grooves (groove 5 and groove 7, groove 6 and groove 8) and claws (claws 5 and claws 7, claws 6 and claws 8) that are point-symmetrical about the tube axis center must be the same size, otherwise they will not be able to be top-bottom off-center (in addition to not being able to be left-right off-center, which is not possible with the basic form). In other words, when the sizes of these four are not the same, the grooves and claws that are point-symmetrical about the tube axis center must be the same size.

[Third Modification]
The positions and numbers of grooves and pawls of a pipe joint according to a second modified example will be described with reference to FIG.
As shown in Figure 16 (A), in the pipe fitting of the third modified example, the engagement grooves are arranged in a set of two vertically positioned with the pipe axis of the horizontal branch pipe connecting portion 130 as the center of symmetry, and the two engagement grooves are the same size (Groove 1 = Groove 2), and the engagement protrusions are arranged in a set of two vertically positioned with the pipe axis of one large opening 144 in the horizontal branch pipe connecting member 140 as the center of symmetry, and the two engagement protrusions are the same size (Claw 1 and Claw 2) (Claw 1 = Claw 2).

Also, as shown in Figure 16 (B) , in the pipe fitting of the third modified example, the engagement grooves are arranged in a set of two horizontally positioned with the pipe axis of the horizontal branch pipe connecting portion 130 as the center of symmetry, and the two engagement grooves are the same size (Groove 1 = Groove 2), and the engagement protrusions are arranged in a set of two horizontally positioned with the pipe axis of one large opening 144 in the horizontal branch pipe connecting member 140 as the center of symmetry, and the two engagement protrusions are the same size (Claw 1 and Claw 2) (Claw 1 = Claw 2).
Even with the pipe joint according to the third modified example shown in Figures 16(A) and 16(B), it is possible to achieve the feature that left and right eccentricity is not permitted and upper eccentricity and lower eccentricity can be selectively performed.

In this way, in the pipe fittings according to the first and second modified examples described above, the engagement grooves (grooves) and engagement protrusions (claws) are provided in at least two pairs with the pipe axis of the horizontal branch pipe connection part 130 as the center of symmetry, and the engagement grooves (grooves) and engagement protrusions (claws) provided in point-symmetrical positions are the same size (including all being the same size), or the condition that there are pairs with different sizes of the engagement grooves 132 and the engagement protrusions 142 is satisfied. In the pipe fittings according to the third modified example described above, the engagement grooves (grooves) and engagement protrusions (claws) are provided in pairs with the pipe axis of the horizontal branch pipe connection part 130 as the center of symmetry, and the engagement grooves (grooves) and engagement protrusions (claws) are the same size. These pipe fittings according to the first to third modified examples also achieve the same effect as the above-mentioned embodiment (selectively performing upper and lower eccentricity without left and right eccentricity).

In the pipe fitting according to the embodiment and the pipe fitting according to the first and second modified examples described above, the number of pairs of two engaging grooves (grooves) and two engaging projections (claws) is an even number, but the present invention is not limited to this even number, and it may be one pair as in the pipe fitting according to the third modified example described above, or it may be an odd number of pairs, such as three pairs (two of which are the same size and one of which is a different size from the other two pairs).

It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

The present invention is preferable for a pipe joint that connects at least three pipes, two upper and lower pipes and a horizontal branch pipe, which are mainly used for drainage piping in buildings, and is particularly preferable in that even if the pipe axis (axial core) of the part where the horizontal branch pipe is connected in the pipe joint (horizontal branch pipe connection part) does not coincide with the pipe axis (axial core) of the horizontal branch pipe, it can be easily aligned.

REFERENCE SIGNS LIST 10 Pipe joint 100 Pipe joint body 110 Upper pipe connection part 120 Lower pipe connection part 130 Side branch pipe connection part 140 Side branch pipe connection member 150 Water stop packing

Claims (10)

A pipe joint for connecting at least three pipes, including two upper and lower pipes and a horizontal branch pipe,
an upper pipe connection portion for connecting an upper pipe;
A lower pipe connection portion for connecting the lower pipe;
a horizontal branch pipe connection portion provided between the upper pipe connection portion and the lower pipe connection portion in the vertical direction and configured to connect a horizontal branch pipe;
a lateral branch pipe connecting member that connects the lateral branch pipe connecting portion and the lateral branch pipe,
the side branch pipe connecting member is detachably connected to the side branch pipe connecting portion by a bayonet structure,
the lateral branch pipe connecting member has a circular tube shape with openings having different diameters at both ends, one opening having a larger diameter is connected to the lateral branch pipe connecting portion, and the tube axis of the one opening does not coincide with the tube axis of the other opening,
A pipe fitting characterized in that, when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion by a bayonet structure, the pipe axis of the other opening of the horizontal branch pipe connecting member can be offset up and down on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion, and can be offset left and right on a horizontal line passing through the pipe axis of the horizontal branch pipe connecting portion. A pipe joint for connecting at least three pipes, including two upper and lower pipes and a horizontal branch pipe,
an upper pipe connection portion for connecting an upper pipe;
A lower pipe connection portion for connecting the lower pipe;
a horizontal branch pipe connection portion provided between the upper pipe connection portion and the lower pipe connection portion in the vertical direction and configured to connect a horizontal branch pipe;
a lateral branch pipe connecting member that connects the lateral branch pipe connecting portion and the lateral branch pipe,
the lateral branch pipe connecting member is detachably connected to the lateral branch pipe connecting portion by a bayonet structure,
the lateral branch pipe connecting member has a circular tube shape with openings having different diameters at both ends, one opening having a larger diameter is connected to the lateral branch pipe connecting portion, and the tube axis of the one opening does not coincide with the tube axis of the other opening,
A pipe fitting configured such that, when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion by a bayonet structure, the pipe axis of the other opening of the horizontal branch pipe connecting member can be selectively offset up and down on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion, or offset left and right on a horizontal line passing through the pipe axis of the horizontal branch pipe connecting portion, and the pipe axis of the other opening is offset in either the up, down, left or right direction to align the pipe axis of the horizontal branch pipe with the pipe axis of the horizontal branch pipe connecting portion when they do not coincide in top or side view . A pipe joint for connecting at least three pipes, including two upper and lower pipes and a horizontal branch pipe,
an upper pipe connection portion for connecting an upper pipe;
A lower pipe connection portion for connecting the lower pipe;
a horizontal branch pipe connection portion provided between the upper pipe connection portion and the lower pipe connection portion in the vertical direction and configured to connect a horizontal branch pipe;
a lateral branch pipe connecting member that connects the lateral branch pipe connecting portion and the lateral branch pipe,
the side branch pipe connecting member is detachably connected to the side branch pipe connecting portion by a bayonet structure,
the lateral branch pipe connecting member has a circular tube shape with openings having different diameters at both ends, one opening having a larger diameter is connected to the lateral branch pipe connecting portion, and the tube axis of the one opening does not coincide with the tube axis of the other opening,
When the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion by a bayonet structure, a tube axis of the other opening of the horizontal branch pipe connecting member is vertically offset on a vertical line passing through a tube axis of the horizontal branch pipe connecting portion,
As the bayonet structure, a plurality of substantially L-shaped engagement grooves are provided on an inner peripheral surface of the side branch pipe connecting portion, and a plurality of engagement protrusions that engage with the engagement grooves are provided on an outer peripheral surface of the one opening of the side branch pipe connecting member,
The lateral branch pipe connecting member is inserted into the lateral branch pipe connecting portion and rotated around the pipe axis of one of the openings, so that the engagement protrusion reaches an end of the engagement groove and is positioned, and the lateral branch pipe connecting member is connected to the lateral branch pipe connecting portion, so that the pipe axis of the other opening of the lateral branch pipe connecting member is offset vertically on a vertical line passing through the pipe axis of the lateral branch pipe connecting portion,
At least two pairs of the engagement grooves are provided with a center of symmetry about the pipe axis of the horizontal branch pipe connecting portion, and the engagement grooves provided at the point-symmetric positions have the same size,
The engaging projections are provided in at least two sets of two with the pipe axis of the one opening of the lateral branch pipe connecting member as the center of symmetry, and the engaging projections provided at the point-symmetrical positions have the same size,
There are pairs of the engagement groove and the engagement projection having different sizes,
A pipe fitting characterized in that, when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion by a bayonet structure, the pipe axis of the other opening of the horizontal branch pipe connecting member can be selected to be either upwardly eccentric or downwardly eccentric on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion. At least one pair of the engagement grooves has an end located on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion,
The pipe fitting according to claim 3, characterized in that when the pipe axis of the other opening of the lateral branch pipe connecting member is eccentric upward, at least one set of the engaging protrusions is located on a vertical line passing through the pipe axis of the one opening. The engagement groove and the engagement protrusion are provided in at least two pairs of symmetry with respect to the tube axis, one pair being provided in a horizontal position and the other pair being provided in a vertical position,
The size of the engagement groove is larger in a horizontal position than in a vertical position, and the size of the engagement protrusion is larger in a horizontal position than in a vertical position,
or
5. The pipe joint according to claim 4, wherein a size of said engagement groove is smaller in a horizontal position than in a vertical position, and a size of said engagement projection is smaller in a horizontal position than in a vertical position. The engaging grooves are provided in pairs at vertical positions with the pipe axis of the horizontal branch pipe connecting portion as the center of symmetry, and the two engaging grooves are the same size,
The pipe fitting according to claim 3, wherein the engaging projections are provided in a pair in a vertical position with the pipe axis of one of the openings in the horizontal branch pipe connecting member as a center of point symmetry, and the two engaging projections are the same size. The engagement grooves are provided in a pair in a horizontal position with the pipe axis of the horizontal branch pipe connecting portion as a center of point symmetry, and the two engagement grooves are the same size,
The pipe fitting according to claim 3, wherein the engaging protrusions are provided in a pair in a horizontal position with the pipe axis of one of the openings in the horizontal branch pipe connecting member as a center of point symmetry, and the two engaging protrusions are the same size. A piping structure using a pipe fitting according to any one of claims 1 to 7. A method for constructing the piping structure according to claim 8, comprising the steps of:
a step of determining whether or not it is necessary to align a tube axis of the side branch pipe with a tube axis of the side branch pipe connecting portion when the tube axis does not coincide with a tube axis of the side branch pipe in a top view or a side view before connecting the side branch pipe connecting member to the side branch pipe connecting portion by a bayonet structure;
a step of determining in which direction, up, down, left or right, the tube axis of the other opening should be offset when it is determined that the two openings need to be aligned;
an installation method comprising: connecting the horizontal branch pipe connecting member to the horizontal branch pipe connecting portion using a bayonet structure so that, when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion, the pipe axis of the other opening of the horizontal branch pipe connecting member is offset up and down on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion, or offset left and right on a horizontal line passing through the pipe axis of the horizontal branch pipe connecting portion. A method for constructing a piping structure using a pipe joint that connects at least three pipes, including two upper and lower pipes and a horizontal branch pipe, comprising:
The pipe joint comprises:
an upper pipe connection portion for connecting an upper pipe;
A lower pipe connection portion for connecting the lower pipe;
a horizontal branch pipe connection portion provided between the upper pipe connection portion and the lower pipe connection portion in the vertical direction and configured to connect a horizontal branch pipe;
a lateral branch pipe connecting member that connects the lateral branch pipe connecting portion and the lateral branch pipe,
the lateral branch pipe connecting member is detachably connected to the lateral branch pipe connecting portion by a bayonet structure,
the lateral branch pipe connecting member has a circular tube shape with openings having different diameters at both ends, one opening having a larger diameter is connected to the lateral branch pipe connecting portion, and the tube axis of the one opening does not coincide with the tube axis of the other opening,
When the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion by a bayonet structure, a tube axis of the other opening of the horizontal branch pipe connecting member is vertically offset on a vertical line passing through the tube axis of the horizontal branch pipe connecting portion, or is horizontally offset on a horizontal line passing through the tube axis of the horizontal branch pipe connecting portion,
The construction method includes:
a step of determining whether or not it is necessary to align a tube axis of the side branch pipe with a tube axis of the side branch pipe connecting portion when the tube axis does not coincide with a tube axis of the side branch pipe in a top view or a side view before connecting the side branch pipe connecting member to the side branch pipe connecting portion by a bayonet structure;
a step of determining in which direction, up, down, left or right, the tube axis of the other opening should be offset when it is determined that the two openings need to be aligned;
an installation method comprising: connecting the horizontal branch pipe connecting member to the horizontal branch pipe connecting portion using a bayonet structure so that, when the horizontal branch pipe connecting member is connected to the horizontal branch pipe connecting portion, the pipe axis of the other opening of the horizontal branch pipe connecting member is offset up and down on a vertical line passing through the pipe axis of the horizontal branch pipe connecting portion, or offset left and right on a horizontal line passing through the pipe axis of the horizontal branch pipe connecting portion.

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