JP2019099994A - Drain piping structure and drain piping method - Google Patents

Abstract

To provide the drain piping structure with a small manhole connected to a sewage main pipe, and the drain piping method therefor.SOLUTION: A drain piping structure 1 in which a small manhole 30 having an inspection port 33 is disposed in the sewage main pipe 10 buried underground in advance comprises: a sewage main pipe 10, a branch pipe 20 having an opening 22 attached to a hole part 11 provided in a penetrating manner in a pipe wall of the sewage main pipe 10, and the small manhole 30 extending from a pipe connection part 23 of the branch pipe 20 to the ground, wherein the branch pipe 20 has a saddle part 21 deposited on an outer peripheral surface around the hole part 11 in the sewage main pipe 10, the saddle part 21 is provided with the opening 22 communicating with the hole part 11, and a pipe connection part 23 for connecting a lower end of the small manhole 30 is extended from a periphery of the opening 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drainage piping structure in which a small manhole having an inspection port is disposed in a sewage main buried in the ground in advance, and a drainage piping method thereof.

  Conventionally, when newly providing a manhole to the sewage main buried in the ground in advance, the sewage main is cut, and the manhole is disposed at the cut portion (for example, see Patent Document 1) ).

JP, 2017-89308, A

  However, if it is the method of making manhole intervene in the part which cut and divided the necessary part of the main sewer, it is necessary to dig the circumference of the part to be intervened widely and deeply, and it will be the construction as a whole including the work of backfilling There is a problem that the period becomes long. In addition, there is a strong demand for reducing the amount of excavation as much as possible because the possibility of ground subsidence after construction will arise if the amount of excavation increases.

  Here, the existing sewage main has a certain gradient so that the drainage naturally flows down and can be drained, but the above-mentioned gradient changes due to the land subsidence after construction, and the drainage is clogged There is a risk of causing

  Further, in the conventional configuration as described above, there is also a problem that the divided portion becomes a so-called hell pipe, and the connection operation becomes extremely complicated.

  Then, this invention aims at providing the drainage piping structure which can arrange | position a small manhole simply with respect to a sewage main pipe, and its drainage piping method.

  The present invention is a drainage pipe structure in which a small manhole having an inspection port is disposed in a sewage main buried in advance in the ground, and the sewage main and the pipe wall of the sewage main are provided. A branch pipe having one end attached to a hole provided in a penetrating shape, and the small manhole extending toward the ground from the other end of the branch pipe, the branch pipe being the sewage The saddle portion as the one end portion deposited on the outer peripheral surface around the hole portion in the main pipe, the saddle portion is provided with an opening portion communicating with the hole portion, and the periphery of the opening portion From the above, a pipe connection portion as the other end portion for connecting the lower end portion of the small manhole is drawn out.

  In such a configuration, a small manhole can be newly retrofitted to the main sewage without dividing the main sewage. Specifically, since a large-scale operation for cutting the sewage main pipe is not necessary and the operation for providing the hole portion is sufficient, the digging amount as a whole is significantly reduced. Further, since the branch pipe is connected to the hole, the problem of so-called hell piping does not occur. Also, since there is no separation of the sewage main pipe, reverse gradient does not occur in the sewage main pipe.

  Moreover, the structure by which at least one part of the hole edge of the said hole of the said sewage main pipe is located in the inspection port of the said small manhole is proposed by planar view.

  With this configuration, the main sewer pipe can be viewed directly from the inspection port of the small manhole, and the inspection work of the main sewer can be performed easily and reliably.

  Furthermore, a configuration is proposed in which the central axis of the sewage main at the position of the hole of the sewage main and the central axis at the inspection port of the small manhole do not intersect.

  With this configuration, it becomes possible to retrofit a small manhole in an arrangement eccentrically to the main sewage without interfering with other buried pipes and the like buried around the main sewage. .

  Furthermore, a branch pipe for introducing drainage into the small manhole is connected to the small manhole, and a central axis of an inspection port in the small manhole corresponds to the central axis of the sewage main pipe. The configuration located on the branch pipe side is proposed as a reference.

  With this configuration, the excavating area of the ground when the branch pipe is newly embedded and the excavating area of the ground when the small manhole is newly embedded become partially common. Therefore, the amount of excavation on the ground can be dramatically reduced as a whole.

  Furthermore, the present invention is a drainage piping method in which a small manhole having an inspection port is newly provided to a sewage main buried in the ground in advance, and a hole is formed in a pipe wall of the sewage main. Including the steps of providing in a penetrating manner, attaching one end of the branch to the hole, and connecting the small manhole to the other end of the branch so as to extend toward the ground. The branch pipe includes a saddle portion as the one end portion deposited on an outer peripheral surface around the hole portion in the sewage main pipe, and the saddle portion is provided with an opening portion communicating with the hole portion. A drainage pipe method is characterized in that a pipe connection portion as the other end portion for connecting a lower end portion of the small manhole is drawn out from a peripheral edge of the opening portion.

  In such a configuration, a small manhole can be newly retrofitted to the main sewage without dividing the main sewage. Specifically, since a large-scale operation for cutting the sewage main pipe is not necessary and the operation for providing the hole portion is sufficient, the digging amount as a whole is significantly reduced. Moreover, since it is the structure which connects the said branch to the said hole, the problem of what is called hell piping does not arise, either. Also, since there is no separation of the sewage main pipe, reverse gradient does not occur in the sewage main pipe.

  In addition, a configuration is proposed in which at least a part of the hole edge of the hole of the sewage main pipe is located in the inspection port of the small manhole in plan view.

  With this configuration, the main sewer pipe can be viewed directly from the inspection port of the small manhole, and the inspection work of the main sewer can be performed easily and reliably.

  Furthermore, in the step of connecting the small manhole to the other end of the branch pipe, the central axis of the sewage main at the position of the hole of the sewage main and the central axis of the inspection port of the small manhole A configuration is proposed in which the small manholes are connected so that they do not intersect.

  With this configuration, it becomes possible to retrofit a small manhole in an arrangement eccentrically to the main sewage without interfering with other buried pipes and the like buried around the main sewage. .

  Furthermore, in the configuration including the step of connecting a branch pipe for introducing drainage into the small manhole to the small manhole, the inspection port in the small manhole when connecting the small manhole to the other end of the branch pipe A configuration is proposed in which the branch pipe and the small manhole are connected at a position disposed on the branch pipe side with reference to the central axis of the main sewer line with respect to the central axis of the main sewage.

  With this configuration, the excavating area of the ground when the branch pipe is newly embedded and the excavating area of the ground when the small manhole is newly embedded become partially common. Therefore, the amount of excavation on the ground can be dramatically reduced as a whole.

  The drainage piping structure of the present invention has the effect of being able to simply construct a piping structure in which a small manhole is connected to the sewage main pipe.

  The drainage piping method of the present invention also has the effect of being able to simply arrange a small manhole on the main sewerage line.

The drainage piping structure which concerns on Example 1 is shown, (a) is a top view of the state which removed the cover body, (b) is a longitudinal cross-sectional view of the state which attached the cover body. The procedure which builds the drainage piping structure which concerns on Example 1 is shown, (a) is a top view of the sewage main pipe which provided the hole part, (b) is an expansion longitudinal cross-sectional view. The procedure of constructing the drainage piping structure which concerns on Example 1 is shown, (a) is a top view which shows the state which connected the branch pipe to the sewage main pipe, (b) is an expansion longitudinal cross-sectional view. The procedure which builds the drainage piping structure which concerns on Example 1 is shown, (a) is a longitudinal cross-sectional view which shows the state which connected the main-body part, (b) is a longitudinal cross-sectional view which shows the state which further connected the straight pipe part. It is. The drainage piping structure which concerns on Example 2 is shown, (a) is a top view, (b) is a longitudinal cross-sectional view. The drainage piping structure which concerns on Example 3 is shown, (a) is a top view, (b) is a longitudinal cross-sectional view.

  An embodiment according to the drainage pipe structure of the present invention will be described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

Example 1
First, the outline of the drainage piping structure 1 will be described according to FIG. The drainage piping structure 1 includes a sewage main pipe 10, a branch pipe 20 connected to the sewage main pipe 10, a small manhole 30 connected to the branch pipe 20, and a branch pipe 40 connected to the small manhole 30. There is.

  Here, for example, the sewage main pipe 10 is an existing one buried in the ground in advance, and a circular hole portion 11 is formed in the pipe wall at the upper end portion of the sewage main pipe 10 which is the connection point of the small manhole 30 Are newly provided in a penetrating manner.

  Furthermore, one end of a branch pipe 20 is attached to the hole 11 described above. More specifically, one end of the branch pipe 20 is formed of a saddle-shaped saddle portion 21, and the saddle portion 21 is attached to the outer peripheral surface around the hole portion 11 of the sewage main pipe 10 with an adhesive or the like. ing.

  Further, an opening 22 communicating with the hole 11 is provided at the center of the saddle 21. Furthermore, from the peripheral edge of the opening 22, a straight pipe-shaped tube connection portion 23 is drawn out. The other end of the branch pipe 20 is configured by the pipe connection portion 23.

  The lower end of the small manhole 30 is attached to the pipe connection portion 23 which is the other end of the branch pipe 20. With this configuration, the small manhole 30 is extended from the pipe connection 23 toward the ground.

  Further, the small manhole 30 is formed at the upper end of the straight pipe portion 32 directly connected to the pipe connection portion 23 of the branch pipe 20, the straight pipe portion 32 extending upward from the main body portion 31, and And a cover (protective cover) 34 for closing the inspection port 33.

  The main body portion 31 includes an outlet portion 311 connected to the pipe connection portion 23 of the branch pipe 20 and an upper end opening portion 312 to which the straight pipe portion 32 is connected. Furthermore, a branch pipe connection port 35 is provided on the side wall of the main body 31, and the downstream end of the branch pipe 40 for introducing drainage into the small manhole 30 is connected to the branch pipe connection port 35. It is done.

  In the drainage piping structure 1 described above, the sewage flows through the existing sewage main pipe 10, and the drainage water flowing through the branch pipe 40 can join the sewage main pipe 10 via the small manhole 30. In addition, it is possible to inspect the sewage main pipe 10 and the like from the inspection port 33 of the small manhole 30.

  Next, steps of constructing the drainage piping structure 1 of the present embodiment will be described in order. Specifically, a drainage piping method will be described in which the small manhole 30 is newly connected to the existing sewage main pipe 10 and the drainage of the branch pipe 40 is newly joined to the sewage main pipe 10.

  First, as shown in FIGS. 2 (a) and 2 (b), the ground is excavated to expose the planned connection point of the sewage main 10 buried in the ground, and a hole is formed in the upper part of the exposed sewage main 10. The part 11 is pierced in a penetrating manner.

  Next, as shown in FIG. 3, the branch pipe 20 is connected to the hole 11 so that the outer peripheral surface around the hole 11 perforated in the sewage main pipe 10 is covered with the saddle portion 21. At this time, the hole 11 and the opening 22 of the branch pipe 20 communicate with each other, and the pipe connection portion 23 of the branch pipe 20 is opened upward.

  Furthermore, as shown to Fig.4 (a), the outflow port part 311 of the main-body part 31 in the small manhole 30 is connected to the pipe | tube connection part 23. As shown in FIG. At the same time, the downstream end of the branch pipe 40 is connected to the branch pipe connection port 35 of the main body 31.

  Then, as shown in FIG. 4 (b), the straight pipe portion 32 is connected to the upper end opening portion 312 of the main body portion 31. In addition, the full length of the straight pipe part 32 is suitably adjusted so that the inspection port 33 may become the height of the ground surface. Then, the lid 34 is attached to the inspection opening 33 to close the inspection opening 33.

  In the drainage piping method of constructing the drainage piping structure 1 described above, the small manhole 30 can be simply retrofitted easily without dividing the sewage main pipe 10 into right and left. That is, since the large-scale work of cutting the sewage main pipe 10 is unnecessary and the work of providing the hole portion 11 is sufficient, the digging amount as a whole is largely reduced. In addition, since the branch pipe 20 is connected to the hole portion 11, the main sewer pipe 10 does not become so-called hell piping. In addition, since a new pipe is not connected to the separated sewage main pipe 10, a reverse drainage does not occur in the new drainage path.

  In the configuration of the first embodiment, the inspection opening 33 is disposed immediately above the hole 11, and at least a part of the hole edge of the hole 11 is located in the inspection opening 33. Therefore, the inside of the sewage main pipe 10 can be viewed directly from the inspection port 33, and the inspection work of the sewage main pipe 10 can be performed easily and reliably.

Example 2
The drainage piping structure 2 of Example 2 will be described below according to FIG. In addition, what has the structure similar to Example 1 attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIG. 5, the drainage piping structure 2 includes a sewage main pipe 10, a branch pipe 50 connected to the sewage main pipe 10, a small manhole 30 connected to the branch pipe 50, and a branch connected to the small manhole 30. And a tube 40.

  Here, a circular hole 12 is newly provided in the pipe wall at the upper portion of the sewage main pipe 10 in a penetrating manner. Here, the hole 12 is not provided centering on the upper end (top) of the sewage main pipe 10, but is provided at a position lower than the upper end (top). In other words, the hole 12 is positioned obliquely upward with reference to the central axis CL1 of the sewage main pipe 10.

  Further, one end of the branch pipe 50 is attached to the hole 12. More specifically, a saddle portion 51 as one end portion of the branch pipe 50 is attached to the outer peripheral surface around the hole portion 12, and the opening portion 52 provided in the saddle portion 51 and the hole portion 12 of the sewage main pipe 10 Are in communication. And the pipe connection part 53 as the other end is drawn out obliquely upward from the peripheral edge of the opening 22, and the pipe connection part 53 is configured by a bent pipe so that the pipe connection part 53 is The upstream opening 531 opens vertically upward.

  Further, the lower end of the small manhole 30 is attached to the pipe connection portion 53 of the branch pipe 50. The configuration of the small manhole 30 and the branch pipe 40 is the same as that of the first embodiment.

  Next, a drainage piping method for constructing the drainage piping structure 2 will be described.

  First, the ground is excavated to expose the connection point of the sewage main 10 buried in the ground, and the hole 12 is pierced in the exposed sewage main 10 in a penetrating manner. In addition, specifically, the hole part 12 perforates the side by which the branch pipe 40 mentioned later among the upper parts of the sewage main pipe 10 is arrange | positioned.

  Next, the branch pipe 50 is connected to the hole 12. Further, the main body portion 31 of the small manhole 30 is connected to the pipe connection portion 53 of the branch pipe 50, and the downstream end portion of the branch pipe 40 is connected to the branch pipe connection port portion 35 of the main body portion 31.

  At this time, as shown in FIG. 5A, part of the hole edge of the hole 12 of the sewage main pipe 10 is located in the inspection port 33 of the small manhole 30 in plan view. With this configuration, the inside of the sewage main pipe 10 can be viewed directly from the inspection port 33 of the small manhole 30, and the inspection work of the sewage main pipe 10 becomes very easy.

  Further, the drainage piping structure 2 has a positional relationship in which the central axis CL1 of the sewage main 10 at the position of the hole 12 of the sewage main 10 and the central axis CL2 at the inspection port 33 of the small manhole 30 do not intersect. . As described above, by making the small manhole 30 eccentric to the sewage main pipe 10 with the central axes CL1 and CL2 not crossing each other, for example, another buried pipe 45 embedded around the sewage main pipe 10 Can be retrofitted newly with the small manhole 30.

  Furthermore, in the drainage piping structure 2, the central axis line CL2 of the inspection port 33 in the small manhole 30 is located on the branch pipe 40 side with reference to the central axis line CL1 of the sewage main pipe 10. In such a configuration, the excavating area of the ground when the branch pipe 40 is newly embedded and the excavating area of the ground when the small manhole 30 is newly embedded are partially common, and the excavation as a whole is performed. The amount can be dramatically reduced.

[Example 3]
The drainage piping structure 3 of the third embodiment will be described below according to FIG. In addition, what has the structure similar to Example 1, 2 attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIG. 6, the drainage piping structure 3 includes a sewage main pipe 10, a branch pipe 60 connected to the sewage main pipe 10, a small manhole 70 connected to the branch pipe 60, and a branch connected to the small manhole 70. And a tube 40.

  Here, in the hole portion 12 provided in the sewage main pipe 10, a saddle portion 61 as one end portion of the branch pipe 60 is attached to the outer peripheral surface around the hole portion 12. Moreover, the pipe connection part 63 protruded from the periphery of the opening part 62 provided in the branch pipe 60 is comprised with a bending pipe, and the upstream side opening part 631 of the pipe connection part 63 opens toward straight side. ing.

  Further, the lower end of the small manhole 70 is attached to the pipe connection portion 63. That is, a small manhole 70 extends from the pipe connection portion 63 toward the ground.

  More specifically, the small manhole 70 extends upward from the main body portion 71 connected to the pipe connection portion 63 of the support pipe 60 and the main body portion 71, and the upper end is opened on the ground to form an inspection port 73. A tube portion 72 and a lid 74 for closing the inspection port 73 are provided. In the main body portion 71, a mesh member having an inner bottom surface with a slope is preferably used.

  In addition, the side wall of the straight pipe portion 72 is provided with a branch pipe connection port 75 to which the downstream end of the branch pipe 40 for introducing the drainage into the small manhole 70 is connected.

  In this drainage piping structure 3, there is a positional relationship in which the central axis CL1 of the sewage main 10 at the position of the hole 12 of the sewage main 10 and the central axis CL3 at the inspection port 73 of the small manhole 70 do not intersect. Therefore, for example, other small buried pipes 45 can be avoided and the small manhole 70 can be newly retrofitted.

  Also in the drainage piping structure 3, the central axis CL3 of the inspection port 73 in the small manhole 70 is located on the branch pipe 40 side with reference to the central axis CL1 of the sewage main pipe 10. For this reason, the amount of excavation can be dramatically reduced as a whole.

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

  In addition, it is desirable that the branch pipe 40 for introducing the drainage into the small manholes 30, 70 be constructed so that the central axis of the branch pipe 40 is perpendicular to the central axis of the main sewage pipe 10. Further, the number of branch pipes 40 connected to the small manholes 30, 70 is not limited to one but may be plural. Further, the branch pipe 40 does not have to be connected to the small manholes 30, 70.

  In addition, in order to construct the drainage piping structures 1, 2 and 3, an intermediate member may of course be interposed in the required drainage path. Further, for example, a rubber ring may be disposed between the branch pipes 20, 50, 60 and the main body portions 31, 71 to prevent the leakage of drainage.

  Also, of course, other steps may be included in the procedure of constructing the drainage piping structures 1, 2, and 3.

1, 2, 3 Drainage piping structure 10 Sewage main pipes 11, 12, holes 20, 50, 60 Branch pipes 22, 52, 62 Openings 23, 53, 63 Pipe connection 30, 70 Small manhole 31, 71 Main body 33, 73 inspection port 34, 74 lid 35, 75 branch pipe connection port 40 branch pipe CL1 central axis line of sewage main pipe CL2 central axis line of inspection port CL3 central axis line of inspection port

Claims (8)

A drainage pipe structure in which a small manhole having an inspection port is disposed in a sewage main buried in advance in the ground,
Said main sewer,
A branch pipe having one end attached to a hole provided in a penetrating manner in the pipe wall of the sewage main;
The small manhole extending toward the ground from the other end of the branch pipe;
Equipped with
The branch pipe includes a saddle portion as the one end portion deposited on an outer peripheral surface around the hole portion in the sewage main pipe, and the saddle portion is provided with an opening portion communicating with the hole portion. A drainage pipe structure characterized in that a pipe connection portion as the other end portion for connecting a lower end portion of the small manhole is drawn out from a peripheral edge of the opening portion. The drainage piping structure according to claim 1, wherein at least a part of the hole edge of the hole of the sewage main pipe is located in the inspection port of the small manhole in plan view. The drainage piping structure according to claim 1 or 2, wherein the central axis of the sewage main at the position of the hole of the sewage main and the central axis at the inspection port of the small manhole do not intersect. . A branch pipe for introducing drainage into the small manhole is connected to the small manhole.
The drainage piping structure according to claim 3, wherein a central axis of the inspection port in the small manhole is located on the branch pipe side with reference to the central axis in the sewage main pipe. A drainage piping method in which a small manhole having an inspection port is newly provided to a sewage main buried in advance in the ground,
Providing a through hole in the pipe wall of the sewage main;
Attaching one end of the branch pipe to the hole;
Connecting the small manhole to the other end of the branch pipe so as to extend toward the ground;
Including
The branch pipe includes a saddle portion as the one end portion deposited on an outer peripheral surface around the hole portion in the sewage main pipe, and the saddle portion is provided with an opening portion communicating with the hole portion. A drainage pipe method characterized in that a pipe connection portion as the other end portion for connecting a lower end portion of the small manhole is put out from a peripheral edge of the opening portion. The drainage piping method according to claim 5, wherein at least a part of the hole edge of the hole portion of the sewage main pipe is located in the inspection port of the small manhole in plan view. In the step of connecting the small manhole to the other end of the branch pipe,
The small manhole is connected so that the central axis of the sewage main at the position of the hole of the sewage main and the central axis of the inspection hole of the small manhole do not intersect. The drainage piping method of claim 6. In the configuration including the step of connecting a branch pipe for introducing drainage into the small manhole to the small manhole,
When the small manhole is connected to the other end of the branch pipe, the central axis of the inspection port in the small manhole is located on the branch pipe side with reference to the central axis of the sewage main pipe The drainage piping method according to claim 7, wherein the branch pipe and the small manhole are connected.

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