JP2005030162A - Sub-pipe joint within manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily place a sub-pipe almost vertically inside a manhole in a simple structure irrespective of inclination of a drainage pipe which flows discharged water into a drainage inflow hole in the manhole. <P>SOLUTION: A joint body 10 is integrally formed with a saddle section 12 having a surface curved along an inner peripheral face of the manhole, lateral pipe section 15 having an opening of a drainage inflow port 14 at the saddle part 12 as well as an opening of a lateral pipe cleaning port 16 facing to the drainage inflow port 14 and also a vertical pipe section 19 which communicates with an inner bottom face of the lateral pipe section 15 and opens a sub-pipe connecting part 20 at the bottom end. A vertical pipe cleaning port 22 is opened on the upper side of the vertical pipe section 19, lateral pipe section 15 and a communicating section 21. A lateral lid member 25 which freely opens/shuts is provided to cover the lateral pipe cleaning port 16 of the joint body 10. A diameter of the lateral pipe section 15 of the joint body 10 is enlarged toward the drainage inflow port 14 while the diameter of the drainage inflow port 14 is formed larger than an outside diameter of the drainage pipe which inflows the discharged water into the manhole. An inside diameter of the vertical pipe section 19 of the joint body 10 is the same as or smaller than an inside diameter of the drainage pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sub-joint in a manhole that allows drainage from a drain pipe such as a sewer to flow into a sub pipe provided in the manhole.

  Generally, a concrete manhole has a structure in which a drainage inflow hole is drilled in a peripheral surface, and a drainage pipe is connected to the drainage inflow hole to allow drainage to flow into the manhole. In this configuration in which drainage flows from the drain pipe into the manhole, if there is a large drop from the position of the drain inflow hole to the invert part at the bottom of the manhole, a so-called waterfall falls and the impact due to the fall of the drainage causes an invert part of the manhole. There is a problem in that erosion is eroded, trash and other garbage are scattered, and noise is generated.

  Therefore, although the response varies depending on the local government, for example, according to the design guidelines of the Japan Sewerage Association, a sub-pipe is provided in the manhole when the head of the wastewater flowing into the manhole is 600 mm or more.

  On the other hand, from the viewpoint of ease of handling, economy, and ease of construction, synthetic resin drainage pipes and pipe fittings are widely used, and drainage pipes connected to the manhole drainage inlets. Synthetic resin products are used for the secondary pipe connected to the hole and the joint connecting the drain pipe and the secondary pipe.

  Conventionally, a drain pipe end formed by a synthetic resin is inserted into a drain inflow hole opened in the peripheral surface of the manhole, and the drain pipe is fixed to the inner peripheral surface of the manhole at the end of the drain pipe. The sub pipe joint in a manhole is connected, and the sub pipe shape | molded with the synthetic resin is connected to this sub pipe joint in a manhole (for example, refer patent document 1).

  However, when the drop from the drain pipe that requires a sub pipe to the manhole to the invert part is large, the slope of the drain pipe connected to the manhole is often large, and the terminal part is connected to the drain hole of the conventional manhole. In the configuration in which the drain pipe inserted is connected to the secondary pipe via a joint fixed to the inner peripheral surface of the manhole, the bending angle between the drain pipe connected to the joint and the secondary pipe is fixed at 90 °. When the drain pipe is inclined and inserted into the manhole, there is a problem that the drain pipe cannot be connected to the joint.

  Further, conventionally, as shown in FIG. 6, the joint 3 connecting the drain pipe 1 and the sub pipe 2 is not fixed to the inner peripheral surface of the manhole 4, and the end of the drain pipe 1 is inserted into the drain inlet hole 5 of the manhole 4. The joint 3 is connected to the terminal portion of the drainage pipe 1 and the sub pipe 2 is connected to the joint 3.

  In the configuration shown in FIG. 6, if the gradient of the drain pipe 1 is large, the secondary pipe 2 cannot be provided vertically, and the secondary pipe 2 disposed in the manhole 4 is parallel to the inner peripheral surface of the manhole 4. Therefore, there is a problem that the manhole 4 protrudes toward the center and the manhole 4 is narrowed.

Therefore, a configuration has been proposed in which a universal joint is used on the secondary pipe connection side or the drain pipe connection side of the joint so that the secondary pipe can be connected in parallel with the inner peripheral surface of the manhole even if the drain pipe has a gradient (for example, , See Patent Document 2).
Utility Model Registration No. 2592718 (Page 2, Fig. 3) Japanese Patent No. 3033078 (page 3-4, FIG. 3)

  The problem to be solved is that in the configuration in which the universal joint is provided on the drain pipe connection side or the sub pipe connection side of the joint, the structure becomes complicated and the number of parts increases.

  The present invention has been made in view of the above problems, and has a simple configuration, and a sub-pipe for flowing the drainage flowing from the drainage pipe is provided in the manhole regardless of the gradient of the drainage pipe for flowing the drainage into the drainage inlet hole of the manhole. It is intended to provide a sub-joint in a manhole that is easy to construct and is arranged substantially vertically.

  The sub-joint in a manhole according to the present invention has a curved surface shape along the inner peripheral surface of the manhole, a saddle portion that is fixed to the inner peripheral surface of the manhole, a drainage inlet is opened in the saddle portion, and the drainage flow A horizontal pipe part that opens the horizontal pipe cleaning port opposite to the inlet and a vertical pipe part that communicates with the inner bottom surface of the horizontal pipe part and that opens the sub pipe connection part at the lower end are integrally formed. A joint main body having a vertical pipe cleaning port opened above the communicating portion with the horizontal pipe portion; and a horizontal lid body for closing and closing the horizontal pipe cleaning port of the joint main body so as to be openable and closable. The diameter of the drainage inlet is increased toward the drainage inlet, and the drainage inlet is formed to have a larger diameter than the outer diameter of the drainage pipe for allowing drainage to flow into the manhole. The diameter is the same as the inner diameter or smaller than the inner diameter of the drain pipe.

  Then, a drain inflow hole is drilled in the manhole according to the position of the drain pipe, and the drain inflow hole opened in the joint body is aligned with the drain inflow hole of this manhole, and the saddle portion is fixed to the inner peripheral surface of the manhole. The horizontal pipe cleaning port of the joint body is closed with a horizontal lid.

  Also, the drain pipe end is inserted through the manhole drain through the manhole joint so that the open end of the drain pipe end faces the drain inlet of the joint body and the vertical pipe section of the joint body The secondary pipe is connected to the pipe connecting portion, and the lower end opening of the secondary pipe is brought close to the invert portion of the manhole.

  When constructing this secondary pipe, it is not necessary to connect the end of the drainage pipe directly to the side pipe part of the joint body, and the side pipe part of the joint body expands toward the drainage inlet and the drainage inlet Since the diameter of the drainage pipe is larger than that of the drainage pipe that allows the drainage to flow into the manhole, the drain pipe end can easily face the drainage inlet of the fitting body even if the drainage pipe has a gradient. The sub pipe can be disposed along the inner peripheral surface of the manhole, and the sub pipe does not protrude greatly into the manhole, so that the sub pipe can be easily constructed even if the drain pipe has a large gradient.

  Furthermore, since it is not necessary to directly connect the end of the drain pipe to the horizontal pipe section of the joint body, depending on the construction situation, the process of inserting the drain pipe end through the manhole joint into the drain hole of the manhole; The construction order of both processes, including the process of constructing the secondary pipe, can be appropriately performed.

  In this state, the drainage flowing through the drainage pipe flows into the drainage inlet of the joint body from the opening of the terminal part, and the drainage flows from the horizontal pipe part to the vertical pipe part and from the lower end opening part of the sub pipe to the invert part of the manhole. To leak. At this time, there is almost no drop from the lower end opening of the secondary pipe to the invert part of the manhole, and the invert part is not eroded by the drainage.

  In addition, the drainage that flows from the drainage pipe into the drainage inlet of the joint body and flows through the horizontal pipe part reliably flows into the vertical pipe part without flowing into the manhole from the horizontal pipe cleaning port closed by the horizontal lid. Be flowed down.

  Furthermore, by opening the horizontal pipe cleaning port closed by the horizontal lid, the horizontal pipe part can be inspected and cleaned from the horizontal pipe cleaning port, and the vertical pipe part and the secondary pipe are inspected from the opened vertical pipe cleaning port. Can be cleaned.

  In addition, even if the ground changes due to an earthquake or the like, the end portion of the drain pipe is not directly connected to the horizontal pipe portion of the joint body, so that the communication portion between the manhole and the drain pipe does not break.

  Next, the sub-joint in the manhole of the present invention is a guide surface inclined toward the inside of the vertical pipe portion at the communicating portion between the horizontal pipe portion of the joint body and the vertical pipe portion opened on the inner bottom surface of the horizontal pipe portion. Is formed.

  And the waste_water | drain which flows through a horizontal pipe part from the waste_water | drain inlet of a coupling main body flows out into a vertical pipe part smoothly along the guide surface of the communicating part inclined toward the inside of a vertical pipe part.

  Moreover, the sub pipe joint in a manhole of this invention closes the vertical pipe cleaning port of a joint main body so that opening and closing is possible with a vertical cover body.

  And the waste water which flowed out from the drain pipe flows into the horizontal pipe part from the drain inlet of the joint body.For example, even if the waste water which collided with the horizontal lid repels upward, the vertical lid opens the vertical pipe cleaning port. Splashing can be prevented, and by opening the vertical lid, the vertical pipe portion and the secondary pipe can be inspected and cleaned from the vertical pipe cleaning port.

  Furthermore, the sub-joint in a manhole of the present invention is provided with an annular water stop packing that surrounds the drainage inlet and is interposed between the inner peripheral surface of the manhole in the saddle portion of the joint body.

  And even if it does not connect a coupling main body and a drain pipe directly, the waste_water | drain which flowed into the drainage inflow port of a coupling main body does not leak from between a drainage inflow port and the inner peripheral surface of a manhole.

  Furthermore, the sub-joint in a manhole according to the present invention is a water stop packing provided in a saddle portion of a joint main body formed by a packing member having different elastic moduli on the inner peripheral side and the outer peripheral side.

  And, with the packing member having different elastic modulus of the water-stopping packing interposed between the saddle portion of the joint body and the inner peripheral surface of the manhole, the periphery of the drainage inlet of the joint body is in close contact with the inner peripheral surface of the manhole. It is possible to reliably prevent drainage leakage without generating a gap.

  The auxiliary pipe joint in the manhole of the present invention does not need to connect the terminal part of the drain pipe directly to the horizontal pipe part of the joint body when constructing the secondary pipe in the manhole, and the drain pipe has a gradient. However, the end of the drain pipe can easily face the drain inlet of the joint body and the sub pipe can be arranged along the inner peripheral surface of the manhole, so that the sub pipe does not protrude greatly into the manhole. Even if the slope of the drain pipe is large, the construction of the secondary pipe is easy, and the construction sequence of the process of inserting the drain pipe into the drain hole of the manhole and the process of arranging the secondary pipe in the manhole depends on the construction situation. Can be selected as appropriate.

  Furthermore, by opening the horizontal pipe cleaning port closed by the horizontal lid, inspection and cleaning of the horizontal pipe part and the drain pipe can be facilitated from the horizontal pipe cleaning port, and the vertical pipe part from the opened vertical pipe cleaning port. In addition, inspection and cleaning of the secondary pipe can be performed.

  In addition, even if ground changes occur due to an earthquake, the end of the drain pipe is not directly connected to the side pipe of the joint body, so the drain pipe inserted into the drain hole of the manhole and the drain inlet of the joint body There will be no breakage in the communication part.

  Moreover, the waste water which flowed into the horizontal pipe part from the drainage inlet of the joint main body flows smoothly into the vertical pipe part by the guide surface of the communication part between the horizontal pipe part and the vertical pipe part of the joint main body.

  Furthermore, the drainage flowing into the horizontal pipe from the drainage inlet of the joint body can be prevented from splashing out of the vertical pipe cleaning port by the vertical lid, and the vertical pipe and the secondary pipe can be opened by opening the vertical lid. Can be checked and cleaned.

  Even if the joint body and the drain pipe are not directly connected, the drainage that flows into the joint body drainage port leaks from the gap between the joint body drainage inlet and the manhole inner surface by the water stop packing. There is nothing.

  Further, by using a packing member having a different elastic modulus of the water-stopping packing interposed between the saddle portion of the joint body and the inner peripheral surface of the manhole, for example, by reducing the elastic modulus of the water-stopping packing on the inner peripheral side, The periphery of the drainage inlet of the joint main body is in close contact with the periphery of the drainage inflow hole on the inner peripheral surface of the inner peripheral surface, so that a gap is not generated and the leakage of the drainage can be reliably prevented.

  An embodiment of the present invention will be described with reference to FIGS.

  The joint body 10 is integrally formed of synthetic resin, and the joint body 10 is formed with an annular saddle portion 12 fixed to the inner peripheral surface of the manhole 11 on one side portion of the outer peripheral surface. The outer surface of the saddle portion 12 is formed on a curved mounting surface 12a along the inner peripheral surface of the manhole 11, and the saddle portion 12 is formed with an insertion hole 13 for fixing means such as a fixing bolt. Has been.

  The joint body 10 is formed with a lateral pipe portion 15 which is located inside the saddle portion 12 and opens a drainage inlet 14, and the lateral pipe portion 15 is expanded in diameter toward the drainage inlet 14. . Further, a horizontal pipe cleaning port 16 is opened on the other side of the joint body 10 in the horizontal pipe part 15 so as to face the drainage inlet 14. An annular fitting edge 17 is formed on the outer peripheral surface of the peripheral edge of the horizontal tube cleaning port 16, and a fixing hole 18 is formed in the upper and lower portions of the fitting edge 17, respectively.

  Further, the joint body 10 is formed with a vertical pipe portion 19 that is opened at the inner bottom surface of the horizontal pipe portion 15, and a sub pipe connection portion 20 is opened at the lower end of the vertical pipe portion 19. A cylindrical vertical tube cleaning port 22 is opened above the communication portion 21 between the vertical tube portion 19 and the horizontal tube portion 15.

  The drainage inlet 14 having an enlarged diameter of the horizontal pipe portion 15 of the joint body 10 is formed to have a larger diameter than the drainage pipe 23 for allowing the drainage to flow into the manhole 11, and the horizontal pipe portion 15 The vertical pipe portion 19 that is reduced in diameter toward the port 16 and communicates with the horizontal pipe portion 15 has an inner diameter that is the same as the inner diameter of the drain pipe 23 or smaller than the inner diameter of the drain pipe 23.

  Further, the communicating portion 21 of the vertical tube portion 19 formed on the inner bottom surface of the horizontal tube portion 15 of the joint body 10 has a guide surface 24 inclined in an arc from the horizontal tube portion 15 into the vertical tube portion 19. Is formed.

  Next, a horizontal lid body 25 formed of a synthetic resin that freely closes and opens the horizontal pipe cleaning port 16 of the joint body 10 is fitted into the horizontal pipe cleaning port 16 to close the horizontal pipe cleaning port 16. And a fixed cylinder portion 27. The protruding portion 26 of the horizontal lid 25 is formed in a shape along the inner peripheral surface of the vertical tube portion 19, and the fixed cylinder portion 27 formed around the protruding portion 26 is a fitting edge 17 of the joint body 10. A fitting groove 29 of a water-stopping O-ring 28 is formed on the outer peripheral surface of the fixed cylinder portion 27.

  Further, the horizontal lid body 25 is formed with insertion holes 30 communicating with the fixing holes 18 formed in the fitting edges 17 of the horizontal pipe cleaning port 16 of the joint body 10 at the vertical positions of the fixed cylinder portion 27, respectively. The fixing pin 31 inserted through the fixing hole 18 formed at the upper portion of the edge 17 is inserted through the insertion holes 30 and 30 formed in the fixing cylinder portion 27 of the horizontal lid body 25 to the fixing hole 18 below the fitting edge 17. The fixed cylinder portion 27 of the horizontal lid body 25 that is inserted and fitted to the fitting edge 17 of the horizontal pipe cleaning port 16 of the joint body 10 is fixed, and the horizontal lid body 25 is moved by the water pressure flowing through the horizontal pipe portion 15. Stops coming off.

  Further, the vertical lid body 32 that closes the vertical tube cleaning port 22 of the joint body 10 so as to be openable and closable is formed with a fitting edge 33 that is fitted to the outside of the vertical tube cleaning port 22.

  Next, an annular recess 34 is formed on the outer surface of the saddle portion 12 of the joint body 10. The recess 34 surrounds the drain inlet 14 and is interposed between the inner peripheral surface of the manhole 11. A water packing 35 is provided. The water-stop packing 35 includes an inner packing member 36 and an outer packing member 37 having different elastic moduli, and the inner packing member 36 has a smaller elastic modulus than the outer packing member 37. It has become.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 5, a drainage inflow hole 38 is drilled in the manhole 11 in accordance with the position of the drainage pipe 23, and a manhole joint 44 formed of rubber or the like is fitted into the drainage inflow hole 38. Is fixed in the drainage inflow hole 38 with mortar or the like.

  Further, the drainage inlet 14 formed in the joint body 10 is aligned with the drainage inlet 38 of the manhole 11, and the curved mounting surface 12a of the saddle portion 12 is brought into contact with the inner peripheral surface of the manhole 11, The saddle portion 12 is fixed to the inner peripheral surface of the manhole 11 with a fixing means such as a bolt inserted into the insertion hole 13 of the saddle portion 12, and the horizontal pipe cleaning port 16 of the joint body 10 is closed with the horizontal lid body 25. The vertical tube cleaning port 22 is closed with the vertical lid 32.

  In this state, the end portion of the drain pipe 23 is inserted into the manhole joint 44, the drain pipe 23 is held by the manhole joint 44, and the end portion of the drain pipe 23 is made to face the drain inlet 14 of the joint body 10.

  In addition, a secondary pipe 39 formed of synthetic resin is connected to the secondary pipe connecting portion 20 of the vertical pipe portion 19 of the joint body 10, and a bent pipe 40 is connected to the lower end of the secondary pipe 39, thereby The distal end of the bent tube 40 serving as the lower end opening of 39 is opened close to the invert part 41 of the manhole 11 and in parallel with the invert part 41. In this state, the sub pipe 39 is fixed to the inner peripheral surface of the manhole 11 by the fixing tool 42.

  When installing the sub pipe 39, it is not necessary to connect the end portion of the drain pipe 23 directly to the horizontal pipe portion 15 of the joint body 10, and the drain pipe 23 faces the end portion so as to face the drain inlet 14. In addition, the drain inlet 14 is larger in diameter than the drain pipe 23, and even if the drain pipe 23 has a gradient, the end of the drain pipe 23 can be easily connected to the drain inlet of the joint body 10. 14 can be arranged along the inner peripheral surface of the manhole 11, and the sub pipe 39 does not protrude greatly into the manhole 11, and even if the drain pipe 23 has a large gradient, The pipe 39 can be easily constructed.

  In addition, since the end portion of the drain pipe 23 is not directly connected to the lateral pipe portion 15 of the joint body 10, the end portion of the drain pipe 23 faces the drain inlet 14 of the joint body 10, and then the joint body It is not limited to the construction order of connecting the secondary pipe 39 to the secondary pipe connecting part 20 of the 10 vertical pipe part 19, but after connecting the secondary pipe 39 to the secondary pipe connecting part 20 of the vertical pipe part 19 of the joint body 10 It is also possible to construct the drain pipe 23 in such an order that the end portion of the drain pipe 23 faces the drain inlet 14 of the joint body 10.

  In this state, the waste water flowing through the drain pipe 23 flows into the drain inlet 14 of the joint body 10 from the end of the drain pipe 23, and the waste water flowing in from the drain pipe 23 flows laterally from the drain inlet 14 of the joint body 10. The drainage flows into the pipe section 15, drainage flows out to the vertical pipe section 19 along the guide surface 24 inclined toward the inside of the vertical pipe section 19, and drainage flows into the vertical pipe section 19 from the lower end opening of the auxiliary pipe 39. It flows into the invert part 41 of the manhole 11 and is drained from the drain pipe 43. At this time, there is almost no drop from the lower end opening of the sub pipe 39 to the invert part 41 of the manhole 11, and the invert part 41 is not eroded by the drainage flowing from the drain pipe 23.

  In addition, the drainage flowing into the drainage inlet 14 of the joint body 10 from the drainage pipe 23 and flowing through the side pipe portion 15 does not fall into the manhole 11 from the side pipe cleaning port 16 closed by the side cover body 25. Then, it flows down to the vertical pipe part 19 reliably.

  Furthermore, by opening the horizontal lid 25 that closes the horizontal pipe cleaning port 16, the horizontal pipe part 15 can be inspected and cleaned from the horizontal pipe cleaning port 16, and the drain pipe 23 can be inspected and cleaned.

  In addition, the drainage that flows from the drain pipe 23 into the drain inlet 14 of the joint body 10 and flows through the horizontal pipe portion 15 is longitudinally separated by the vertical lid 32 even if the drainage that collides with the horizontal lid 25 splashes upward. It is possible to prevent the vertical pipe portion 19 and the auxiliary pipe 39 from being inspected and cleaned by opening the vertical lid 32.

  Even if the joint body 10 and the drain pipe 23 are not directly connected, the waste water flowing from the drain inlet 14 of the joint body 10 is interposed between the drain inlet 14 and the inner peripheral surface of the manhole 11. The water-stopping packing 35 interposed between the saddle portion 12 of the joint body 10 and the inner peripheral surface of the manhole 11 is sealed by the packing members 36 and 37 having different elastic moduli. Since the inner packing member 36 has a lower elastic modulus than the outer packing member 37, for example, the mortar that fixes the manhole joint 44 around the drainage inlet 38 of the manhole 11 leaks out. Even if the surface is uneven, the packing member 36 having a low elastic modulus is in close contact with the inner peripheral surface of the manhole 11, so that there is no gap around the drainage inlet 14 of the joint body 10, and the leakage of drainage is ensured. Can be prevented.

  Further, by forming the packing member 36 on the inner peripheral side of the water-stopping packing 35 provided in the saddle portion 12 of the joint body 10 with a material having a property of expanding when impregnated with moisture, the periphery of the drainage inlet hole 38 of the manhole 11 is formed. And the water stop effect between the periphery of the drainage inlet 14 of the joint body 10 are more reliably enhanced.

  In addition, since the end portion of the drain pipe 23 is not directly connected to the horizontal pipe portion 15 of the joint body 10, the drain pipe 23 and the joint body held in the drain inflow hole 38 of the manhole 11 even if the ground changes due to an earthquake or the like. There is no breakage between the ten drainage inlets 14.

It is a vertical side view of the sub-joint in a manhole which shows one embodiment of this invention. It is a front view of the sub pipe joint in a manhole same as the above. It is a top view of the sub pipe joint in a manhole same as the above. It is a cross-sectional plan view of a sub-joint in a manhole same as the above. It is a vertical front view of the manhole which installed the sub pipe using the sub pipe joint in a manhole same as the above. It is a vertical front view of the manhole which installed the conventional inner sub-pipe.

Explanation of symbols

10 Fitting body
11 Manhole
12 Saddle
14 Drainage inlet
15 Horizontal pipe
16 Horizontal pipe cleaning port
19 Vertical pipe
20 Secondary pipe connection
21 Communication part
22 Vertical pipe cleaning port
23 Drain pipe
24 Guide plane
25 Horizontal cover
32 Vertical lid
35 still water packing
36, 37 Packing material

Claims (5)

A saddle portion that has a curved surface shape along the inner peripheral surface of the manhole and is fixed to the inner peripheral surface of the manhole. A drainage inlet is opened in the saddle portion, and a horizontal pipe cleaning port is formed opposite the drainage inlet. An open horizontal tube portion and a vertical tube portion communicating with the inner bottom surface of the horizontal tube portion and having a secondary tube connection portion opened at the lower end are integrally formed, and above the communication portion between the vertical tube portion and the horizontal tube portion. A joint body with a vertical pipe cleaning opening in the
A horizontal lid for closing and closing the horizontal pipe cleaning port of the joint body;
The horizontal pipe portion of the joint body expands toward the drainage inlet and the drainage inlet is formed to have a diameter larger than the outer diameter of the drainage pipe for allowing drainage to flow into the manhole.
A sub-joint in a manhole, wherein the inner diameter of the vertical pipe portion of the joint body is the same as the inner diameter of the drain pipe or smaller than the inner diameter of the drain pipe.   The guide surface inclined toward the inside of this vertical pipe part is formed in the communicating part of the horizontal pipe part of the joint body and the vertical pipe part opened in the inner bottom surface of this horizontal pipe part. Secondary pipe joint in manhole.   The sub pipe joint in a manhole according to claim 1 or 2, wherein the vertical pipe cleaning port of the joint body is closed with a vertical lid so as to be freely opened and closed.   4. A sub-manhole sub-port according to claim 1, wherein an annular water-stopping packing is provided in a saddle portion of the joint body so as to surround the drainage inlet and to be interposed between the inner peripheral surface of the manhole. Pipe fittings.   5. The sub-joint in a manhole according to claim 4, wherein the water-stop packing provided in the saddle portion of the joint body is formed by packing members having different elastic moduli on the inner peripheral side and the outer peripheral side.

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