JP6916057B2 - Indirect drainage fittings, pipe connection method, and pipe connection structure - Google Patents

Description

The present invention relates to an indirect drainage joint that connects pipes that are so-called hell pipes.

Conventionally, it has been adopted as a drainage route for draining drainage of equipment such as a water heater, and prevents the drainage from flowing back from the drainage pipe on the downstream side and adversely affecting the equipment. The indirect drainage structure is already well known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-21166

However, when constructing the drainage route as described above, it may become a so-called hell pipe. Specifically, when the drainage pipe on the downstream side is arranged in advance and the drainage pipe for discharging the drainage drainage of the equipment is arranged after the equipment such as the water heater is installed. , Becomes a hell plumbing. In this case, since the positions of the drain drainage pipe and the drainage pipe on the downstream side are determined first, there is a problem that the connection work becomes difficult when connecting with the indirect drainage joint interposed therebetween.

Therefore, an object of the present invention is to provide an indirect drainage joint capable of easily performing connection work even if the hell piping is as described above.

Another object of the present invention is to provide a pipe connection method capable of easily performing connection work even if the pipe is hell.

The present invention is formed at the downstream end of the upstream drain pipe that has been piped in advance, and is formed at the end of the drain pipe on the upstream side where the drainage flowing from the upstream flows out, and at the upstream end of the drain pipe on the downstream side that has been piped in advance. On a drainage path portion including a downstream drainage pipe end portion into which drainage flowing from the upstream flows, and the upstream side drainage pipe end portion and the downstream side drainage pipe end portion facing each other in the vertical direction. An indirect drainage joint that connects the upstream drainage pipe end portion and the downstream drainage pipe end portion, and includes a nested outer joint portion and an inner joint portion, and the outer joint portion. At the upstream end of one of the inner joints, an inflow side connection to which the upstream drain pipe end is connected is formed, and the outer joint and the inner joint are formed. An outflow side connection portion to which the downstream side drain pipe end portion is connected is formed at the downstream end portion of the other joint portion, and the outer joint portion and the inner joint portion are vertically connected to each other. It is an indirect drainage joint characterized by being slidable.

In such a configuration, the outer joint portion and the inner joint portion are slid in the vertical direction to change the separation distance between the inflow side connection portion and the outflow side connection portion, and the separation distance is changed. Can be adjusted. Therefore, for example, after interposing the indirect drainage joint in a contracted state at a required position in the hell pipe, the indirect drainage joint is extended to easily connect the upstream drainage pipe and the downstream drainage pipe. be able to.

The drainage includes drainage drainage discharged from equipment arranged on the upstream side, rainwater discharged from a rain gutter arranged on the upstream side, and the like.

Further, it is arranged between the outer peripheral surface of the inner joint portion and the inner peripheral surface of the outer joint portion, and engages the inner joint portion and the outer joint portion with each other to make them relatively immovable. The means is provided, and the inner joint portion and the outer joint portion are engaged with each other by the engaging means in a state where the separation distance between the inflow side connection portion and the outflow side connection portion is minimized. A configuration is proposed.

With such a configuration, when the indirect drainage joint as a product is transported in a packed state, the inner joint portion and the outer joint portion can be fixed in a compact state. , Rattling is suppressed and damage during transportation can be prevented. In addition, workability is improved because the inner joint portion and the outer joint portion do not unintentionally separate during construction.

Further, it is proposed that a water passage portion for communicating the internal space of the joint portion and the outside of the joint portion is provided on the side peripheral portion of the other joint portion of the outer joint portion and the inner joint portion. Will be done.

With such a configuration, if the drainage flows backward from the end of the downstream drainage pipe toward the upstream, the drainage flowing back along the inner peripheral surface of the other joint can be directly discharged to the outside. can.

Further, a trap means is installed in the outer joint portion and the other joint portion of the inner joint portion to allow drainage to flow in the downstream direction and prevent an invading object from entering in the upstream direction. A configuration is proposed.

With such a configuration, if an insect or an odor as an invading object tries to enter upstream, the trap means blocks the invading object from entering, so that the invading object enters the upstream drainage pipe. It is possible to prevent it from reaching.

Here, the outer joint portion and the other joint portion of the inner joint portion are provided with a water passage portion for communicating the internal space of the joint portion with the outside of the joint portion, and the water passage member. It is desirable that the connecting member to which the outflow side connecting portion is arranged is provided as a separate member from each other, and the trap means is detachably attached to the lower end of the water passing member.

With such a configuration, by separating the water passage member and the connection member, the trap means attached to the lower end of the water passage portion can be easily taken out and maintenance work such as replacement can be performed. ..

The trap means may be a check valve that allows the drainage to flow in the downstream direction and prevents the drainage as an approaching object from flowing back in the upstream direction.

With such a configuration, if the drainage flows back upstream, the check valve blocks the backflow of the drainage, so that the drainage can be prevented from reaching the upstream drainage pipe. ..

Further, it is desirable that the water passing member and the connecting member are connected to each other by a bayonet mechanism.

In such a configuration, the other joint portion is slidable in the vertical direction with respect to the one joint portion. Therefore, when the bayonet mechanism is adopted, the water passing member and the connecting member are normally strengthened. The water passage member and the connecting member can be easily separated from each other in the vertical direction at the time of maintenance. Therefore, workability is remarkably improved.

Further, the inflow side connection portion is formed at the upstream end portion of the inner joint portion, and the inflow side connection portion and the upstream drainage pipe end portion are screwed together. It is proposed that the outer peripheral surface of the inner joint portion is formed with an engaged portion to which a tool used for screwing the inflow side connecting portion to the upstream side drainage pipe end portion is engaged.

With such a configuration, the inner joint portion can be easily and surely screwed to the upstream drainage pipe end portion by using a tool.

Further, the present invention is a pipe connection method using the indirect drainage joint, in which the inflow side connection portion and the upstream side drainage pipe end portion are connected, and the outer joint portion and the inner joint portion are connected to each other. By sliding one of them in the vertical direction to increase the separation distance between the inflow side connection portion and the outflow side connection portion, the outflow side connection portion and the downstream side drain pipe end portion are connected. Alternatively, the outflow side connection portion and the downstream side drain pipe end portion are connected, and either the outer joint portion or the inner joint portion is slid in the vertical direction to slide the inflow side connection portion. This is a pipe connection method characterized in that the inflow side connection portion and the upstream side drain pipe end portion are connected by increasing the separation distance between the and the outflow side connection portion.

In such a configuration, even in a situation where the upstream drainage pipe and the downstream drainage pipe are so-called hell pipes, the piping work of the indirect drainage joint can be easily and quickly performed.

Further, the present invention has a pipe connection structure using the above-mentioned indirect drainage joint, and the upstream side drainage pipe end is inserted into the inflow side connection portion to form the upstream side drainage pipe end and the inflow side. The upstream drainage pipe end is inserted into the relay pipe member to which the connection is connected or is fitted to the inflow side connection, and the upstream drainage pipe end and the inflow side connection are connected. It is a pipe connection structure characterized by being connected to and.

Further, the present invention has a pipe connection structure using the above-mentioned indirect drainage joint, in which the downstream drainage pipe end is inserted into the outflow side connection to form the downstream drainage pipe end and the outflow side. The downstream drainage pipe end is inserted into a relay pipe member to which the connection is connected or is fitted to the outflow side connection, and the downstream drainage pipe end and the outflow side connection are connected. It is a pipe connection structure characterized by being connected to and.

In such a pipe connection structure, since the inflow side connection part or the outflow side connection part can be connected in two types of pipe connection modes, the shape and dimensions of the upstream side drainage pipe end or the downstream side drainage pipe end. Plumbing work can be performed easily and quickly according to the above.

The indirect drainage joint of the present invention has an effect that the upstream drainage pipe and the downstream drainage pipe can be easily and quickly connected even in a situation where the pipe is a so-called hell pipe.

Further, the piping connection method of the present invention has an effect that the piping work of the indirect drainage joint can be easily and quickly performed even in a situation of so-called hell piping.

Further, the piping connection structure of the present invention has an effect that the piping work of the indirect drainage joint can be easily and quickly performed according to the situation at the site.

It is explanatory drawing which shows the use state of the joint for indirect drainage. It is an external perspective view of the joint for indirect drainage. The joint for indirect drainage is shown, (a) is a front view, and (b) is a vertical sectional view. The joint for indirect drainage is shown, (a) is a side view, and (b) is a vertical sectional view. It is explanatory drawing which shows the operation outline of a valve body, (a) shows a fluid backflow prevention state, and (b) shows a passing state. An indirect drainage joint in a state where the inner diameter reduced portion and the ridge portion are engaged is shown, (a) is a side view, and (b) is a vertical cross-sectional view. It is explanatory drawing which shows the process of connecting the joint for indirect drainage. It is explanatory drawing which shows the process of connecting the joint for indirect drainage. It is a vertical cross-sectional view which shows the state which the water passing member and the connecting member were separated. It is explanatory drawing which showed the pipe connection structure concerning another Example, (a) shows the state which connected the upstream side drainage pipe end part and drainage pipe part through a relay pipe member, (b) is upstream. The state where the end of the side drainage pipe and the drainage pipe are directly connected is shown. It is explanatory drawing which showed the pipe connection structure concerning another Example, (a) shows the state which connected the downstream side drainage pipe end part and drainage pipe part via a relay pipe member, (b) is downstream. The state where the end of the side drainage pipe and the drainage pipe are directly connected is shown.

An embodiment in which the indirect drainage joint of the present invention is used on a drainage path portion for draining drainage drainage of a water heater will be described in detail. The present invention is not limited to the examples shown below, and the design can be changed as appropriate.

As shown in FIG. 1, the indirect drainage joint 1 is arranged and used between the water heater 70 arranged on the upstream side and the drainage main 75 arranged on the downstream side. Specifically, the indirect drainage joint 1 is connected to the drain pipe portion 71, which is an upstream drainage pipe for discharging the drainage drainage of the water heater 70, and communicates with the stile 74 connected to the drainage main pipe 75. A drainage pipe portion 73, which is a downstream drainage pipe, is connected. The indirect drainage joint 1 has a function of indirectly draining the drainage drainage flowing from the upstream toward the drainage main 75.

Hereinafter, the configuration of the indirect drainage joint 1 will be described.
As shown in FIGS. 2 to 4, the indirect drainage joint 1 is inserted into the tubular outer joint portion 10 whose axial direction is the vertical direction and the inner side of the outer joint portion 10 and assembled in a nested manner. A tubular inner joint portion 30 is provided.

First, the outer joint portion 10 will be described.
As shown in FIGS. 2 to 4, the outflow where the downstream drainage pipe end portion 73a formed at the upstream end of the drainage pipe portion 73 is connected to the downstream end portion (lower end portion) of the outer joint portion 10. The side connection portion 11 is formed.

Further, the outer joint portion 10 includes a cylindrical water passing member 15 arranged on the upper side and a tubular connecting member 16 arranged on the lower side and including the outflow side connecting portion 11. Here, the water passing member 15 and the connecting member 16 are separate members from each other, and are connected by a known bayonet mechanism 17 so as to be detachable in the axial direction (vertical direction).

Further, a water passage portion 13 composed of a plurality of through holes for communicating the internal space 12 of the outer joint portion 10 and the outside of the outer joint portion 10 is provided on the side peripheral portion of the water passage member 15.

Further, as shown in FIGS. 3b and 4b, an inner diameter reduced portion 18 having a reduced inner diameter is formed at the upper end opening of the water passage member 15. The stopper function of the inner diameter reduced portion 18 will be described later.

On the other hand, as shown in FIGS. 3b and 4b, a check valve 20 as a trap means is detachably attached to the lower end of the water flow member 15. The check valve 20 has a function of allowing drainage drainage to flow in the downstream direction in the indirect drainage joint 1 and preventing the drainage from flowing back in the upstream direction.

More specifically, the check valve 20 has an elastically deformable valve structure in which drainage drainage can flow inside and the diameter is reduced toward the lower side. The discharge port 22 (see FIG. 5) formed at the lower end is closed by the pair of flat plate-shaped rims 23, 23 facing each other in normal contact with each other.

Next, the inner joint portion 30 will be described.
As shown in FIGS. 2, 3a and 4a, the upstream drainage pipe end 71a formed at the downstream end of the drain pipe 71 is connected to the upstream end (upper end) of the inner joint 30. The inflow side connecting portion 31 to be formed is formed in a female screw shape. As shown in FIG. 7a, the upstream drainage pipe end 71a of the drain pipe 71 has a male screw shape that can be screwed to the inflow side connection 31 of the inner joint 30, and the upstream drainage. The pipe end portion 71a and the inflow side connecting portion 31 are screwed together to fix each other.

Further, as shown in FIG. 2 and the like, an engaged portion 32 having a hexagonal columnar outer shape is formed on the outer peripheral surface of the inner joint portion 30. As a result, the work of screwing the inflow side connection portion 31 to the upstream side drainage pipe end portion 71a can be easily and quickly performed by engaging a general tool such as a hexagon wrench with the engaged portion 32. ..

Further, in the inner joint portion 30, a cylindrical sliding cylinder portion 35 inserted into the inner diameter reduced portion 18 of the outer joint portion 10 is formed in a portion below the engaged portion 32. Further, at the lower end of the sliding cylinder portion 35, a large diameter portion 36 having an outer diameter that cannot pass through the inner diameter reduced portion 18 of the outer joint portion 10 is formed.

In addition, a ridge portion 37 is formed in a circumferential shape on the outer peripheral surface of the upper end portion of the sliding cylinder portion 35. Specifically, the ridge portion 37 has an outer diameter slightly larger than the inner diameter of the inner diameter reduced portion 18 so that it can engage with the inner diameter reduced portion 18 of the outer joint portion 10.

Next, the operation mode of the outer joint portion 10 with respect to the inner joint portion 30 will be described.
Since the outer joint portion 10 and the inner joint portion 30 are assembled in a nested manner as described above, the outer joint portion 10 and the inner joint portion 30 are slidable in the vertical direction with respect to each other. Here, the sliding range of the outer joint portion 10 when the inner joint portion 30 is used as a reference is as follows.

That is, when the outer joint portion 10 is located at the upper limit as shown in FIGS. 6a and 6b, the inner diameter reduced portion 18 of the outer joint portion 10 and the ridge portion 37 of the inner joint portion 30 are engaged with each other. It becomes immovable to each other. As described above, when the inner diameter reduced portion 18 functions as a stopper, the separation distance between the outflow side connection portion 11 and the inflow side connection portion 31 in the indirect drainage joint 1 is minimized. The engaging means according to the present invention is configured by the inner diameter reduced portion 18 of the outer joint portion 10 and the ridge portion 37 of the inner joint portion 30.

On the other hand, as shown in FIG. 3, when the outer joint portion 10 is located at the lower limit, the inner diameter reduced portion 18 of the outer joint portion 10 and the large diameter portion 36 of the inner joint portion 30 are engaged with each other. .. At this time, in the indirect drainage joint 1, the separation distance between the outflow side connection portion 11 and the inflow side connection portion 31 becomes maximum.

Next, the steps of the connection method for connecting the indirect drainage joint 1 on the drainage path portion X will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7A, first, on the drainage path portion X between the drain pipe portion 71 and the drain pipe portion 73, which are both pre-piped and face each other in the vertical direction, the core of the drain pipe portion 73 is formed. To secure a space below the drain pipe portion 71 so that the indirect drainage joint 1 can intervene. In this case, the drain pipe portion 71 side may be bent to secure a space for connecting the indirect drainage joint 1.

Next, as shown in FIG. 7B, the inflow side connection portion 31 of the indirect drainage joint 1 is screwed onto the upstream drainage pipe end portion 71a of the drain pipe portion 71. At this time, since the engaged portion 32 is formed in the inner joint portion 30 of the indirect drainage joint 1, the work can be easily and quickly performed using a general tool such as a hexagon wrench. At this time, the indirect drainage joint 1 is in a state in which the inner diameter reduced portion 18 of the outer joint portion 10 and the ridge portion 37 of the inner joint portion 30 are engaged with each other. That is, the distance between the outflow side connection portion 11 and the inflow side connection portion 31 is the minimum.

After that, as shown in FIG. 8A, the core of the drainage pipe portion 73 is returned to the original position. In this state, the downstream drainage pipe end portion 73a of the drainage pipe portion 73 is located directly below the outflow side connection portion 11 of the indirect drainage joint 1.

Then, as shown in FIG. 8B, the outer joint portion 10 is pulled downward so as to disengage the inner diameter reduced portion 18 of the outer joint portion 10 and the ridge portion 37 of the inner joint portion 30. Then, the outflow side connection portion 11 and the downstream side drainage pipe end portion 73a of the drainage pipe portion 73 are connected, and the work of connecting the pipes is completed. As a result, the pipe connection structure according to the present invention is constructed.

In this way, the indirect drainage joint 1 does not forcibly fit between the drain pipe portion 71 and the drainage pipe portion 73, which has become a hell pipe, but slides the outer joint portion 10 and the inner joint portion 30 up and down. By moving, the drain pipe portion 71 and the drain pipe portion 73 can be connected in order.

In the normal state where the drain drainage does not flow in the state where the construction as shown in FIG. 1 is completed, the rims 23 and 23 of the check valve 20 are in close contact with each other as shown in FIG. 5 (a). The discharge port 22 is closed and the fluid backflow prevention state α is set. In such a state, the fluid (drainage or gas) in the drainage main 75 is prevented from flowing out to the upstream side of the check valve 20. Therefore, the fluid does not leak into the water heater 70 and the equipment is not damaged.

On the other hand, when the drain drainage flows out from the water heater 70 and a predetermined amount of drain drainage is accumulated in the check valve 20, the check valve 20 is elastically deformed by the weight of the drain drainage and is shown in FIG. 5 (b). As shown, the rim portions 23 and 23 have a shape that is separated from each other, and the discharge port 22 is in an open passing state β. In such a state, the drain drainage in the check valve 20 is appropriately discharged to the downstream side. Further, the indirect drainage joint 1 has a configuration in which the inner joint portion 30 is arranged on the upper side and the outer joint portion 10 is arranged on the lower side, and the drain drainage is from the inner joint portion 30 having a small inner diameter to the inner diameter. Since the structure is such that the drainage flows toward the large outer joint portion 10, the drain drainage is smoothly drained without staying in the indirect drainage joint 1. When the drain drainage accumulated in the check valve 20 is properly discharged, the check valve 20 returns to its original shape and returns to the fluid backflow prevention state α.

Even if the drainage from the drainage pipe portion 73 flows back to the indirect drainage joint 1, the backflow water can flow out from the internal space 12 through the water passage portion 13, so that the indirect drainage structure is appropriate. It has been built.

By the way, in the above-mentioned pipe connection method, an adhesive or the like may be applied in advance to the upstream side drainage pipe end portion 71a and the downstream side drainage pipe end portion 73a. In particular, since the upstream drainage pipe end portion 71a and the inflow side connecting portion 31 are fixed to each other by being screwed together, water leakage from the screwed portion may be prevented by using sealing tape.

Further, the connection method of the indirect drainage joint 1 is not limited to the above. For example, after connecting the downstream side drainage pipe end portion 73a and the outflow side connection portion 11 first, the upstream side drainage pipe end portion 71a and the inflow You may connect it to the side connection part 31.

Further, as shown in FIG. 9, with the indirect drainage joint 1 connected to the pipe, the bayonet mechanism 17 is released to divide the water flow member 15 and the connecting member 16 into upper and lower parts, and reverse from the gap. It is also possible to replace the check valve 20. With such a configuration, the maintenance work of the check valve 20 becomes easy.

In the above embodiment, the dimensions and shape of each part can be freely selected as appropriate.

Further, the outer joint portion 10 and the inner joint portion 30 are preferably made of synthetic resin from the viewpoint of ease of molding, but the present invention is not limited to this.

Further, as the configuration for connecting the water passing member 15 and the connecting member 16, of course, another configuration may be adopted instead of the bayonet mechanism.

Further, the check valve 20 is not limited to the above-mentioned configuration, and may have a configuration using, for example, a float (floating member). Further, the check valve 20 is not essential.

Further, the shape of the water passage portion 13 may have a configuration other than the above-mentioned shape. However, if it is composed of an excessively large through hole, insects or the like may enter from the outside and hinder the function of the indirect drainage joint 1, so it is desirable that the through hole has an appropriate size.

Further, the engaged portion 32 does not have to have a hexagonal column shape, and may have another shape. Further, for example, a hole into which a screwdriver or the like can be inserted may be provided, and the screwdriver or the like may be inserted into the hole to rotate the inner joint portion 30 around an axis. When the upstream drainage pipe end portion 71a has a straight pipe shape instead of a male screw shape, the shape of the inflow side connecting portion 31 may be a shape corresponding to this.

Further, the connection structure between the upstream drainage pipe end portion 71a and the inflow side connection portion 31 may be the structure shown below instead of the above-mentioned structure. That is, as shown in FIG. 10a, the relay pipe member 80 is externally fitted to the inflow side connecting portion 31, and the bushing 81 is interposed in the relay pipe member 80, and the relay pipe member 80 is upstream of the straight pipe shape. The side drain pipe end portion 710a may be inserted. In addition, the outer shape of the inflow side connecting portion 31 enables an indirect connection mode using the relay pipe member 80 as shown in FIG. 10a, and also a mode of directly connecting by screwing as shown in FIG. 10b. It is preferable that the structure has both of the two possible connection modes.

Further, the connection structure between the downstream drainage pipe end portion 73a and the outflow side connection portion 11 may be the structure shown below instead of the above-mentioned structure. That is, as shown in FIG. 11a, the relay pipe member 85 may be fitted onto the outflow side connecting portion 11, and the downstream drainage pipe end portion 730a may be further inserted into the relay pipe member 85. Further, as for the outer shape of the outflow side connecting portion 11, as shown in FIG. 11a, the downstream drainage pipe end portion 73a having a large diameter can be connected, and as shown in FIG. 11b, the downstream side having a small diameter is downstream. It is preferable that the structure is such that the end portion 73a of the side drain pipe can be connected.

Further, the outer joint portion 10 may be arranged on the upstream side and the inner joint portion 30 may be arranged on the downstream side.

Further, instead of the configuration in which the check valve 20 as a trap means is attached, a device (trap means) for preventing insects and odors as an invading object from entering toward the upstream is used. May be good.

Further, the indirect drainage joint 1 may be used as a path for discharging rainwater flowing through the rain gutter, instead of the above-mentioned usage pattern. For example, the lower end of the rain gutter arranged on the upstream side is connected to the inflow side connecting portion 31 of the indirect drainage joint 1, and the drainage communicating with the rainwater main arranged on the downstream side is connected to the outflow side connecting portion 11. A configuration in which the pipes are connected is proposed. The indirect drainage joint 1 having such a configuration has a function of indirectly draining rainwater flowing from the upstream toward the rainwater main.

1 Indirect drainage joint 10 Outer joint part 11 Outflow side connection part 12 Internal space 13 Water flow part 15 Water flow member 16 Connection member 17 Bayonet mechanism 20 Check valve (trap means)
30 Inner joint 31 Inflow side connection 32 Engagement 37 Protrusion 71 Drain pipe (upstream drain pipe)
71a, 710a Upstream drainage pipe end 73 Drainage pipe section (downstream drainage pipe)
73a, 730a Downstream drainage pipe end 80,85 Relay pipe member

Claims (2)

The upstream drainage pipe end, which is formed at the downstream end of the upstream drainage pipe that was previously piped and the drainage flowing from the upstream flows out,
Includes the downstream drainage pipe end, which is formed at the upstream end of the downstream drainage pipe that was previously piped and into which the drainage flowing from the upstream flows.
An indirect connection between the upstream drainage pipe end and the downstream drainage pipe end on a drainage path where the upstream drainage pipe end and the downstream drainage pipe end face each other in the vertical direction. It is a pipe connection structure using a drainage joint,
The joint for indirect drainage is
It has an outer joint and an inner joint that are assembled in a nested manner.
An inflow side connecting portion to which the upstream drainage pipe end portion is connected is formed at the upstream end portion of one of the outer joint portion and the inner joint portion.
An outflow side connection portion to which the downstream side drainage pipe end portion is connected is formed at the downstream end portion of the other joint portion of the outer joint portion and the inner joint portion.
Wherein Ri outer joint part and the inner joint part is slidably der each other in the vertical direction,
The upstream drainage pipe end is inserted into the inflow side connection portion to connect the upstream drainage pipe end portion and the inflow side connection portion, or a relay fitted externally to the inflow side connection portion. The upstream drainage pipe end is inserted into the pipe member to connect the upstream drainage pipe end and the inflow side connection.
Piping connection structure characterized by that. The upstream drainage pipe end, which is formed at the downstream end of the upstream drainage pipe that was previously piped and the drainage flowing from the upstream flows out,
Includes the downstream drainage pipe end, which is formed at the upstream end of the downstream drainage pipe that was previously piped and into which the drainage flowing from the upstream flows.
An indirect connection between the upstream drainage pipe end and the downstream drainage pipe end on a drainage path where the upstream drainage pipe end and the downstream drainage pipe end face each other in the vertical direction. It is a pipe connection structure using a drainage joint,
The joint for indirect drainage is
It has an outer joint and an inner joint that are assembled in a nested manner.
An inflow side connecting portion to which the upstream drainage pipe end portion is connected is formed at the upstream end portion of one of the outer joint portion and the inner joint portion.
An outflow side connection portion to which the downstream side drainage pipe end portion is connected is formed at the downstream end portion of the other joint portion of the outer joint portion and the inner joint portion.
The outer joint portion and the inner joint portion are slidable in the vertical direction with respect to each other.
The downstream drainage pipe end is inserted into the outflow side connection portion to connect the downstream side drainage pipe end portion and the outflow side connection portion, or a relay fitted externally to the outflow side connection portion. The downstream drainage pipe end is inserted into the pipe member to connect the downstream drainage pipe end and the outflow side connection.
Piping connection structure characterized by that.

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