JP4711982B2 - Inner / sub pipe joint and inner / sub pipe apparatus provided with the same - Google Patents

Description

  The present invention relates to an inner sub pipe joint that joins a sewer pipe connected to a manhole and an inner sub pipe provided in the manhole, and an inner sub pipe device including the same.

  Sewage discharged from homes and the like is collected into a manhole through a sewage pipe (inflow pipe) and flows into a downstream sewage pipe (outflow pipe) connected to the manhole. In this way, the sewage flows through the sewage pipes through several manholes and eventually reaches the sewage treatment plant.

  By the way, it is necessary to incline the sewer pipe so that filth is not clogged. However, in order to dispose the sewer pipe with a steep slope, it is necessary to bury the lower end portion of the sewer pipe deep in the ground. Therefore, in order to bury the sewer pipe deeply in the ground as described above, it is necessary to dig deeply into the ground, and the workability is not good. In addition, it is not preferable to arrange the sewage pipe with a steep slope because the sewage flow becomes too fast. Therefore, it is necessary to arrange the sewer pipe while being gently inclined.

  For example, even when a sewer pipe and a manhole are provided on a slope with a steep slope, as described above, the sewer pipe cannot be provided with a steep slope. Therefore, in such a case, if the sewage pipe and the manhole are arranged in accordance with the slope of the sloping ground, the difference between the inflow pipe and the outflow pipe must be increased. However, if the drop between the inflow pipe and the outflow pipe is large, the sewage that has flowed into the manhole from the inflow pipe is strongly struck against the bottom of the manhole. Therefore, in such a case, the manhole bottom surface may be eroded by sewage and damaged.

Therefore, in order to prevent damage to the inner bottom surface of the manhole, an inner sub-pipe device has been provided in the manhole (for example, see Patent Documents 1 and 2). The inner auxiliary pipe device includes an inner auxiliary pipe that guides sewage flowing from a high place in the manhole to the vicinity of the inner bottom of the manhole, and an inner auxiliary pipe joint that joins the inner auxiliary pipe to the inflow pipe. With such a configuration, the inner auxiliary pipe device alleviates the impact on the inner bottom surface due to the fall of sewage.
JP 2005-127062 A JP 2004-52235 A

  By the way, the inner secondary pipe device described in Patent Document 1 is installed in a manhole by the following method. First, the inner sub pipe joint is fixed to the inner surface of the manhole with an anchor bolt or the like so as to face the downstream opening of the inflow pipe in the manhole. Next, the inner sub pipe is joined to the inner sub pipe joint fixed to the inner surface of the manhole. According to such an installation method of the inner sub pipe device, the inner sub pipe must be joined to the inner sub pipe joint in the manhole. However, the manhole is small. Therefore, the attachment method has a problem that the attachment work becomes difficult and the work time becomes long. In addition, since the work in the manhole must be performed in an unstable state, great care has to be taken, and the worker is burdened physically and mentally.

  On the other hand, in order to solve the above-mentioned problems, an installation method is also used in which the inner sub pipe is joined to the inner sub pipe joint in advance on the ground, and the entire inner sub pipe device is fixed to the inner surface of the manhole collectively. ing. According to such an installation method, the installation work can be performed only once, so that the burden on the worker can be reduced.

  However, the weight of the entire inner sub pipe device in which the inner sub pipe and the inner sub pipe joint are joined is large. When the inner sub pipe device is installed in the manhole, the inlet of the inner sub pipe device (the inlet of the inner sub pipe joint) must be fitted in accordance with the position of the inlet of the inflow pipe connected to the manhole. I must. Specifically, the inner sub pipe device is positioned so that there is no step between the bottom of the inlet of the inner sub pipe joint body and the bottom of the inflow pipe (hereinafter referred to as the pipe bottom), and the anchor bolt Must be attached by etc. Therefore, as described above, when the inner sub-pipe and the inner sub-pipe joint are joined in advance, it is difficult for the worker to fix the positioning while holding the heavy inner sub-pipe device. Therefore, it takes a lot of time for the work, and the work while holding a heavy inner / sub pipe device for a long time is a heavy burden on the worker.

  The present invention has been made in view of such a point, and an object of the present invention is to provide an inner sub pipe joint that is easy to install and an inner sub pipe apparatus including the same, and to install the inner sub pipe apparatus. It is to reduce the burden on workers.

  An inner auxiliary pipe joint according to the present invention is an inner auxiliary pipe joint that joins an inflow pipe having an inflow port that is connected to a manhole and guides sewage into the manhole, and an inner auxiliary pipe provided in the manhole. An inner sub-joint body having an introduction port for introducing sewage into the interior and a discharge port for draining the internal sewage to the outside; an opening having an opening; A mounting base fixed to the inner surface of the manhole so that the opening faces the inlet, and when the inner sub-joint body is engaged with the mounting base, the inlet port is the opening. It is a confrontation with.

  The inner sub pipe joint has two members, an inner sub pipe joint main body and a mounting base. For this reason, when the mounting base is positioned so that the opening and the inlet face each other and fixed in the manhole, the inner sub-joint body can be introduced simply by engaging the inner sub-joint body with the mounting base. The mouth and the inlet can be easily opposed. Therefore, according to the above-mentioned inner / sub pipe joint, the inner / sub pipe joint can be easily mounted in the manhole while aligning the inlet and the inlet of the inner / sub pipe main body. Therefore, according to the inner sub pipe joint, even when the inner sub pipe is pre-joined to the inner sub pipe joint body, the time required for installation can be shortened, and the burden on the operator is reduced. Can be reduced.

  The inner sub-joint body includes a flange portion that protrudes radially outward from the outer peripheral edge of the introduction port, and the mounting base is at least below the opening of the surface facing the inner sub-joint body. A receiving portion for receiving the flange portion, the inner auxiliary pipe fitting main body and the mounting base being formed by placing the flange portion on the receiving portion. It is preferable to engage.

  Thus, according to the inner sub pipe joint, the inner sub pipe joint main body can be easily engaged with the mounting base. Therefore, it is possible to easily face the inlet of the inflow pipe and the inlet of the inner sub-joint body. Therefore, according to the inner sub pipe joint, even when the inner sub pipe is pre-joined to the inner sub pipe joint body, the time required for installation can be further shortened. Can be further reduced.

  The mounting base protrudes from the outer peripheral portion of the opening on the surface facing the inner sub-joint body to the inner sub-joint body side, and is formed as a part of the receiving portion or separately from the receiving portion Preferably, the guide portion guides the flange portion so that the introduction port faces the opening when the inner sub-joint body is engaged with the mounting base.

  This makes it easier to engage the mounting base and the inner / sub pipe joint body. Therefore, the installation of the inner sub pipe joint is further facilitated.

  By the way, from the viewpoint of smoothly introducing sewage from the inflow pipe to the inner sub-joint, it is desirable that no step be generated between the bottom of the inflow pipe and the bottom of the inlet of the inner sub-joint body. That is, the inner sub-joint body is preferably attached to the inner surface of the manhole so that the bottom of the inlet pipe and the bottom of the inlet of the inner sub-joint body are flush with each other.

  Therefore, it is preferable that the inner sub pipe joint is configured such that when the inner sub pipe joint main body and the mounting base are engaged, the bottom of the opening and the bottom of the introduction port are arranged without a step. .

  This makes it easy to attach the mounting base to the inner surface of the manhole so that the bottom of the opening of the mounting base and the bottom of the inflow pipe are arranged without any step, and the bottom of the inlet and the inlet. Can be arranged without a step.

  The surface of the mounting base that faces the manhole is a curved surface that curves with a predetermined curvature, and is used instead of the mounting base, and the surface that faces the manhole is curved with a curvature different from the predetermined curvature. It is preferable to further include at least one replacement mounting base that is a curved surface.

  According to the inner sub pipe joint, the mounting base can be fixed in close contact with the inner surface of the manhole by making the surface facing the manhole of the mounting base a curved surface that is curved with the curvature of the inner surface of the manhole. As a result, the attachment base can be easily attached, and the installation of the inner / sub pipe joint becomes even easier.

  The inner / sub pipe joint includes a replacement mounting base used instead of the mounting base. Therefore, manholes having different inner diameters can be dealt with by using a replacement mounting base having a curved surface with a curvature different from a predetermined curvature. Therefore, according to the above-mentioned inner / sub pipe joint, only a few types of attachment bases are prepared, and the inner / sub pipe joint can be attached to manholes having different inner diameters without increasing the kinds of inner / sub pipe joint bodies.

  The inner auxiliary pipe device according to the present invention includes an inner auxiliary pipe connected to the discharge port, extending downward from the discharge port, and bending along the inner bottom surface of the manhole.

  According to the inner sub pipe device, the installation in the manhole is facilitated, so that the burden on the worker can be reduced. Further, according to the inner sub pipe device, the sewage from the inflow pipe is gently guided to the inner bottom surface of the manhole. Therefore, even when the head between the inflow pipe and the outflow pipe is large, it is possible to prevent damage to the manhole inner bottom surface due to the sewage from the inflow pipe being strongly struck against the manhole inner bottom surface.

  According to the present invention, it is possible to provide an inner sub pipe joint that is easy to install and an inner sub pipe apparatus including the inner sub pipe joint, and to reduce the burden on workers who install the inner sub pipe apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
<< Configuration of Manhole Device 10 >>
FIG. 1 is a cross-sectional view illustrating a configuration of a manhole apparatus 10 in which an inner sub-pipe apparatus 1 according to the present embodiment is installed. First, with reference to FIG. 1, the structure of the manhole apparatus 10 which concerns on this embodiment is explained in full detail.

  The manhole device 10 includes a manhole 11, an inflow pipe 12 that guides sewage into the manhole 11, an outflow pipe 13 that guides sewage in the manhole 11 to the outside of the manhole 11, and the inner auxiliary pipe device 1 described above.

  The manhole 11 is buried in the ground. A lid 11 a is provided at the upper opening of the manhole 11. On the other hand, an invert portion 11 b having an inclined surface is formed on the inner bottom surface of the manhole 11 in order to allow sewage to flow smoothly toward the outflow pipe 13. Further, a ladder stage 11 c for raising and lowering workers is installed on the inner side surface of the manhole 11.

  The inflow pipe 12 and the outflow pipe 13 are each connected to the manhole 11. Specifically, the outflow pipe 13 is connected to the lower end portion of the manhole 11, and the inflow pipe 12 is connected above the outflow pipe 13. An inlet 14 is formed at the end of the inflow pipe 12 connected to the manhole 11.

<< Configuration of Inner Secondary Pipe Device 1 >>
The inner sub pipe device 1 is installed inside the manhole 11 and between the inflow pipe 12 and the invert part 11b. The inner sub pipe device 1 includes an inner sub pipe 2 made of a cylindrical body, and an inner sub pipe joint 3 that joins the inner sub pipe 2 and the inflow pipe 12 together.

<< Configuration of Inner Secondary Pipe 2 >>
The inner sub-tube 2 includes a straight tube 21 extending in a straight line and a curved tube 22. The straight pipe 21 has an upper end joined to a lower end of the inner sub pipe joint 3 and extends downward. Further, the bent pipe 22 has an upper end joined to a lower end of the straight pipe 21. The curved pipe 22 is bent along the invert part 11b. The inner sub pipe 2 is fixed to the inner side surface of the manhole 11 by a band 23 in the middle of the straight pipe 21.

<< Configuration of Inner / Sub Pipe Joint 3 >>
2 is an enlarged view of the inner auxiliary pipe joint 3 portion of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is an exploded perspective view of the inner sub pipe joint 3.

  As shown in FIGS. 2 to 4, the inner secondary pipe joint 3 includes an inner secondary pipe body 4 and a mounting base 5. As shown in FIGS. 2 and 3, the inner sub-joint body 4 and the attachment base 5 are formed to be engageable with each other and attached to the inner side surface of the manhole 11.

  As shown in FIG. 2, the inner sub-joint body 4 includes an introduction port 31 for introducing sewage into the interior, and a discharge port 32 for discharging the internal sewage to the outside. An inspection port 33 is formed at the upper end of the inner sub-joint body 4, and an inspection port 34 is formed at the end opposite to the introduction port 31. Further, the inner sub-joint body 4 includes a flange portion 36 that protrudes radially outward from the outer peripheral edge of the inlet 31. In the present embodiment, the inner sub-joint body 4 is integrally formed by injection molding. The inspection port 34 is closed by a lid 35 (not shown in FIG. 2, see FIG. 4) except during inspection.

  As shown in FIG. 4, the attachment base 5 is made of a plate-like body and has an opening 41. A substantially U-shaped receiving portion 42 is formed on the outer peripheral portion of the opening 41. The receiving part 42 is formed so as to protrude from the lower side and the side of the opening part 41. The receiving portion 42 is formed so as to be engageable with the flange portion 36 of the inner / sub pipe joint main body 4, and receives the tip portion of the flange portion 36 when engaged with the flange portion 36 (see FIG. 2). In the present embodiment, the receiving portion 42 is integrally formed with other portions of the mounting base 5. However, the receiving portion 42 may be formed separately from other portions of the mounting base 5.

  A portion 42a of the receiving portion 42 that protrudes from below the opening 41 supports the inner / sub pipe joint body 4 (see FIG. 2). On the other hand, the portion 42b of the receiving portion 42 that protrudes from the side of the opening 41 has an introduction port 31 (see FIG. 2) that is connected to the opening 41 when the inner sub-joint body 4 is engaged with the mounting base 5. It becomes a guide part which guides the flange part 36 so as to face each other.

  In addition, as shown in FIG. 3, the surface 5a which opposes the manhole 11 of the attachment base 5 is formed so that it may become a curved surface curved with the predetermined curvature 1 / R1. Here, the predetermined curvature 1 / R1 indicates the curvature of the inner surface of the manhole 11, and R1 is the radius of the inner periphery of the manhole 11.

  The above is the configuration of the manhole apparatus 10 according to the present embodiment. Next, a procedure for attaching the inner auxiliary pipe device 1 to the manhole device 10 will be described with reference to FIGS. 5 and 6.

  First, as shown in FIG. 5, the attachment base 5 is attached to the inner surface of the manhole 11. Specifically, the mounting base 5 is positioned so that the inlet 14 of the inflow pipe 12 (see FIG. 1) connected to the manhole 11 and the opening 41 of the mounting base 5 overlap. At this time, it positions so that a level | step difference may not arise in the bottom part of the opening part 41 of the attachment base 5, and the bottom part of the inflow port 14 (tube bottom of the inflow pipe 12). Then, after determining the position, the mounting base 5 is fixed to the inner surface of the manhole 11 by the anchor bolt 43.

  Next, as shown in FIG. 6, the inner sub-joint body 4 is attached to the attachment base 5 fixed to the inner surface of the manhole 11. It is assumed that the inner sub pipe 2 has already been joined to the inner sub pipe joint body 4.

  Specifically, the inner sub-joint body 4 is pressed against the upper end of the mounting base 5 and slid downward from above. Then, the flange portion 36 of the inner / sub pipe joint body 4 engages with the portion 42b protruding from the side of the opening portion 41 of the receiving portion 42, which is a guide portion, and is guided by the portion 42b.

  When the mounting base 5 is slid downward according to the guide, the lower end portion of the flange portion 36 eventually comes into contact with the portion 42a protruding from below the opening of the receiving portion 42 and is received by the portion 42a. In this way, the flange portion 36 of the inner / sub pipe joint body 4 is placed on the receiving portion 42 and supported by the receiving portion 42. As a result, the inner sub-joint body 4 and the mounting base 5 are engaged.

  The portion 42a protruding from below the opening of the receiving portion 42 has a step between the bottom of the inlet 31 and the bottom of the opening 41 when the inner sub-joint body 4 and the mounting base 5 are engaged. It is formed so as not to occur. Therefore, as described above, when the inner sub pipe joint body 4 and the mounting base 5 are engaged, the introduction port 31 (see FIG. 2) and the opening 41 face each other, and the bottom portion of the introduction port 31 and the opening are opened. The bottom of the portion 41 is flush with the bottom.

  As described above, in the inner sub pipe device 1, the inner sub pipe joint 3 has the two members of the inner sub pipe joint body 4 and the attachment base 5. For this reason, when the mounting base 5 is positioned and fixed in the manhole 11 so that the opening 41 and the inflow port 14 face each other, the inner / sub pipe joint body 4 is simply engaged with the mounting base 5 and then the inner / sub pipe is engaged. The inlet 31 and the inlet 14 of the pipe joint main body 4 can be easily opposed. Therefore, according to the inner sub pipe joint 3, the inner sub pipe joint 3 can be easily installed in the manhole while aligning the inlet 31 and the inlet 14 of the inner sub pipe main body 4. Therefore, according to the inner sub pipe joint 3, the inner sub pipe device 1 can be easily installed (positioned and fixed). Therefore, the inner sub pipe 2 is joined to the inner sub pipe joint body 4 in advance. However, the time required for installation of the inner sub-pipe apparatus 1 itself can be shortened. In addition, this can reduce the burden on the worker.

  Further, in the inner sub pipe device 1, the inner sub pipe joint main body 4 and the attachment base 5 are engaged by placing the flange portion 36 on the receiving portion 42. As a result, according to the inner sub pipe joint 3, the inner sub pipe main body 4 can be easily engaged with the mounting base 5. Therefore, the inlet 14 of the inflow pipe 12 and the inlet 31 of the inner sub-joint body 4 can be easily opposed to each other. Therefore, according to the inner sub pipe joint 3, even when the inner sub pipe 2 is joined to the inner sub pipe main body 4 in advance, the time required for installation can be further reduced. The burden on the worker can be further reduced.

  Further, in the inner auxiliary pipe device 1, the portion 42 b protruding from the side of the opening 41 in the receiving portion 42 of the attachment base 5 is introduced when the inner auxiliary pipe joint body 4 is engaged with the attachment base 5. It becomes a guide part that guides the flange part 36 so that the opening 31 faces the opening part 41. Therefore, the engagement operation between the mounting base 5 and the inner sub pipe joint body 4 becomes easier, and the installation of the inner sub pipe joint 3 becomes even easier. As described above, in this embodiment, the guide portion is formed as a part of the receiving portion 42 like the portion 42b protruding from the side of the opening 41, but the guide portion is the receiving portion 42. And may be formed as separate bodies.

  By the way, from the viewpoint of smoothly introducing the sewage from the inflow pipe 12 to the inner sub-joint 3, the bottom of the inflow pipe 12 (the bottom of the inlet 14) and the bottom of the inlet 31 of the inner sub-joint body 4 are provided. It is desirable that no step is generated. That is, the inner sub-joint body 4 is preferably attached to the inner surface of the manhole 11 such that the bottom of the inflow pipe 12 and the bottom of the inlet 31 of the inner sub-joint body 4 are flush with each other.

  In the inner sub pipe joint 3, when the inner sub pipe joint main body 4 and the mounting base 5 are engaged with each other, the bottom of the opening 41 and the bottom of the introduction port 31 are arranged without a step. Therefore, the attachment base 5 is easily attached to the inner surface of the manhole 11 so that the bottom of the opening 41 of the attachment base 5 and the bottom of the inflow pipe 12 are arranged without a step. The bottom portion of the introduction port 31 can be arranged without a step.

  Further, in the inner secondary pipe device 1, the surface 5 a facing the manhole 11 of the mounting base 5 is formed to be a curved surface that is curved with a curvature 1 / R <b> 1 of the inner surface of the manhole 11. Therefore, the mounting base 5 can be fixed in close contact with the inner surface of the manhole 11. As a result, the attachment base can be easily attached, and the installation of the inner / sub pipe joint becomes even easier.

  Further, in the inner auxiliary pipe device 1, the curved pipe 22 positioned at the lower end portion of the inner auxiliary pipe 2 is bent along the inverted portion 11 b formed on the inner bottom surface of the manhole 11. Therefore, according to the inner auxiliary pipe device 1, the sewage from the inflow pipe 12 is gently guided to the invert portion 11 b formed on the inner bottom surface of the manhole 11. Therefore, even when the head between the inflow pipe 12 and the outflow pipe 13 is large, the inner bottom surface of the manhole 11 is prevented from being damaged by the sewage from the inflow pipe 12 being strongly struck against the inner bottom surface of the manhole 11. can do.

  As shown in FIG. 2, in the inner sub pipe device 1, the opening 41 of the mounting base 5 and the inlet 31 of the inner sub pipe joint body 4 are formed to have a larger diameter than the inlet 14 of the inflow pipe 12. Has been. Thereby, the sewage from the inflow pipe 12 can be smoothly introduced into the inner sub pipe joint 3. In addition, the diameter of the opening 41 and the inlet 31 is larger than that of the largest diameter of the inflow pipes expected to be used, so that any inflow pipe is used. However, it is possible to provide the inner / sub pipe joint 3 that can be used. When the diameters of the opening 41 and the introduction port 31 are formed to be large in this way, for example, the inflow pipe 12 is not connected to the manhole 11 so as to be orthogonal to the side surface of the manhole 11, but seems to be connected obliquely. Even in such a case, it is possible to cope with the inner sub pipe joint 3.

  In addition, the shape of the receiving part 42 of the attachment base 5 is not restricted to the substantially U-shaped thing like this embodiment. For example, as shown to Fig.7 (a), you may form so that it may protrude from the upper direction of the opening part 41, the right side, and the downward direction. In such a case, the inner / sub pipe joint body 4 is engaged with the mounting base 5 by sliding the inner / sub pipe joint body 4 (see FIG. 4) in the direction indicated by the arrow in FIG. be able to.

  In addition, at this time, the part 42e which protruded from the downward direction of the opening part 41 among the receiving parts 42 will support the inner sub-joint main body 4 (refer FIG. 2). Further, in the receiving portion 42, the portion 42c protruding from the upper side of the opening 41 and the portion 42e protruding from the lower side introduce the inlet 31 (FIG. 2) when the inner sub-joint body 4 is engaged with the mounting base 5. Reference) becomes a guide portion for guiding the flange portion 36 so as to face the opening portion 41. Furthermore, a portion 42 d of the receiving portion 42 that protrudes from the right side of the opening 41 has an introduction port 31 (see FIG. 2) that is connected to the opening 41 when the inner sub-joint body 4 is engaged with the mounting base 5. When it comes to the opposite position, it becomes a stopper that restricts it from sliding any further.

  Further, as shown in FIG. 7B, the receiving portion 42 may be formed so as to protrude only from below the opening portion 41. In such a case, the flange portion 36 is guided to the receiving portion 42 so that the introduction port 31 (see FIG. 2) faces the opening portion 41 when the inner sub pipe joint body 4 is engaged with the mounting base 5. There is no guide part. However, even with such a mounting base 5, the inner sub pipe joint body 4 is attached to the mounting base 5 so that the flange portion 36 (see FIG. 4) of the inner sub pipe joint body 4 is positioned on the receiving portion 42. Then, the inlet / outlet port 31 (see FIG. 2) can be easily opposed to the opening 41 by sliding the inner sub-joint body 4 in the left-right direction. Therefore, unlike the prior art, it is not necessary to perform the positioning operation while holding the heavy inner / sub pipe device 1. Therefore, even with such a mounting base 5, the burden on the operator can be reduced.

<Second Embodiment>
As shown in FIG. 8, the inner sub pipe joint 3 of the inner sub pipe apparatus 1 according to the present embodiment includes the inner sub pipe joint 3 (the inner sub pipe joint body 4 and the mounting base 5) of the first embodiment, Replacement mounting bases 52 and 53 are further provided.

  The replacement mounting base 52 is formed such that the surface 52a facing the manhole 11 is a curved surface curved with a curvature 1 / R2 different from the curvature 1 / R1 of the surface 5a facing the manhole 11 of the mounting base 5. ing. The replacement mounting base 52 has substantially the same shape as the mounting base 5 except for the curvature of the curved surface. The replacement mounting base 53 is formed so that the surface 53a facing the manhole 11 is a curved surface curved with a curvature 1 / R3 different from the curvature 1 / R1. Further, like the replacement mounting base 52, the replacement mounting base 53 has substantially the same shape except for the curvature of the mounting base 5 and the curved surface. Other configurations are the same as those in the first embodiment.

  According to the inner sub-joint 3 of the present embodiment, the replacement mounting bases 52 and 53 are provided as described above. Therefore, for manholes 11 having different inner diameters, for example, manholes 11 having inner diameters R2 and R3 shown in FIG. 7, a replacement having a curved surface with a curvature 1 / R2 or a curvature 1 / R3 different from a predetermined curvature 1 / R1. By using the mounting base 52 or 53, it is possible to cope with it. Therefore, according to the inner sub pipe joint 3 according to the present embodiment, only a few types of mounting bases 5 (for example, replacement mounting bases 52 and 53) are prepared without increasing the types of the inner sub pipe joint body 4. It can be configured to be attachable to manholes 11 having different inner diameters.

  As described above, the present invention is useful for an inner auxiliary pipe joint that joins a sewage pipe connected to a manhole and an inner auxiliary pipe provided in the manhole, and an inner auxiliary pipe device including the same.

It is sectional drawing of the manhole apparatus in which the inner auxiliary pipe apparatus which concerns on this embodiment was installed. FIG. 2 is an enlarged view of an inner sub pipe joint portion of FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. It is the perspective view which disassembled the inner sub pipe joint. It is a figure which shows the procedure which attaches an inner auxiliary pipe apparatus to a manhole apparatus. It is a figure which shows the procedure which attaches an inner auxiliary pipe apparatus to a manhole apparatus. (A), (b) is a perspective view which shows the attachment base which concerns on a modification. It is a figure which shows the structure of the inner / sub pipe joint which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner / sub pipe apparatus 2 Inner / sub pipe 3 Inner / sub pipe joint 4 Inner / sub pipe joint main body 5 Mounting base 5a surface (surface facing a manhole)
10 Manhole device 11 Manhole 11b Invert part (inner bottom)
12 Inlet pipe 13 Outlet pipe 14 Inlet 21 Straight pipe 22 Curved pipe 31 Inlet port 32 Outlet port 36 Flange part 41 Opening part 42 Receiving part 52 Replacement mounting base 52a surface (surface facing the manhole)
53 Replacement mounting base 53a surface (surface facing the manhole)

Claims (6)

An inner auxiliary pipe joint that connects an inflow pipe connected to a manhole and having an inlet that guides sewage into the manhole and an inner auxiliary pipe provided in the manhole,
An inner sub-joint body comprising an inlet for introducing sewage into the interior, and an outlet for discharging the sewage inside to the outside;
An attachment base having an opening, formed to be freely engageable with the inner sub-joint body, and fixed to the inner surface of the manhole so that the opening faces the inflow port,
An inner sub pipe joint in which the introduction port faces the opening when the inner sub pipe joint main body is engaged with the mounting base. The inner sub pipe joint according to claim 1,
The inner sub-joint body includes a flange portion projecting radially outward from the outer peripheral edge of the introduction port,
The mounting base includes a receiving portion that protrudes from at least the lower portion of the opening facing the inner sub-joint body to the inner sub-joint body side and receives the flange portion.
The inner sub pipe joint main body and the attachment base are inner sub pipe joints that engage with each other when the flange portion is placed on the receiving portion. The inner sub pipe joint according to claim 2,
The mounting base protrudes from the outer peripheral portion of the opening on the surface facing the inner sub-joint body to the inner sub-joint body side, and is formed as a part of the receiving portion or separately from the receiving portion Provided with a guide portion,
The guide part is an inner / sub pipe joint that guides the flange part so that the introduction port faces the opening when the inner / sub pipe joint body is engaged with the mounting base. The inner sub-pipe joint according to any one of claims 1 to 3,
The inner / sub pipe joint is configured such that when the inner / sub pipe joint main body and the mounting base are engaged with each other, the bottom of the opening and the bottom of the introduction port are arranged without a step. The inner sub-pipe joint according to any one of claims 1 to 4,
The surface of the mounting base that faces the manhole is a curved surface that curves with a predetermined curvature.
The inner / sub pipe joint is further provided with at least one replacement mounting base that is used in place of the mounting base and whose surface facing the manhole is a curved surface curved with a curvature different from the predetermined curvature. . The inner sub-pipe joint according to any one of claims 1 to 5,
An inner auxiliary pipe device comprising: an inner auxiliary pipe connected to the outlet, extending downward from the outlet, and bending along the inner bottom surface of the manhole.

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