JPH0757960B2 - Manhole fittings and manhole piping - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe joint used by being fixed through a wall portion of a manhole, and a manhole piping construction method using the pipe joint.

[Prior Art] Some manholes have a structure in which sewage or the like flowing into the manhole is prevented from directly hitting the inner bottom surface of the manhole to erode the manhole. FIG. 3 shows an example of a conventional structure of this kind, which is called a so-called inner auxiliary pipe structure. The upper portion of the peripheral wall portion 51 of the manhole 50 is substantially T
A pipe fitting 60 having a V shape is fixed. In the pipe joint 60, the first connecting portion 61 to be connected to the inflow pipe (outside pipe component) 10 outside the manhole 50 is a peripheral wall portion of the manhole 50 in advance.
After the through hole opened in 51 is penetrated from the inside to the outside and positioned, the mortar is packed and fixed in the through hole. Further, in the pipe joint 60, the second connecting portion pipe 62 located inside the manhole 50 has its axis oriented vertically.
A sub-pipe (inner piping component) 20 attached in the up-down direction along the inner surface of the peripheral wall portion 51 of the manhole 50 is connected to the lower portion of the second connecting portion 62. The auxiliary pipe 20 has a 90 ° bend pipe 21 at its lower end, and is located above an invert portion 52 provided at the bottom of the manhole 50. This bend pipe 21
By this, the sewage that has flowed down the sub-pipe 20 changes its flow direction horizontally and flows into the manhole 50.

[Problems to be Solved by the Invention] In the conventional manhole pipe joint 60 and the manhole piping construction method using the same, in order to connect the inflow pipe 10 to the manhole 50, in addition to that, the pipe joint 60 has a peripheral wall. It must be fixed to part 51. On the other hand, when the pipe joint 60 is fixed to the peripheral wall portion 51, the inner upper portion of the manhole 50 is narrowed by the protrusion of the second connecting portion 62, and the work of manufacturing the invert portion 52 on the bottom portion of the manhole 50 becomes extremely difficult.
Therefore, conventionally, the invert portion 52 of the manhole 50 is first manufactured, then the pipe joint 60 is fixed to the manhole 50, and then the inflow pipe 10 is connected to the first connecting portion 61 of the pipe joint 60, The construction procedure of connecting the auxiliary pipe 20 to the connecting portion 62 had to be adopted. However, in actual construction, due to various reasons, there are cases where it is desired to precede the construction of the invert portion 52 with the construction of connecting the inflow pipe 10 to the manhole 50, or to carry out both works in parallel, which is a problem. It was

The present invention has been made in view of the above-mentioned problems of the conventional techniques, and an object thereof is to provide a manhole pipe joint capable of performing a manhole and a piping work thereabout in a desired construction procedure, and a manhole pipe. It is about to provide a construction method.

[Means for Solving the Problems] The present invention has been made to achieve the above object,
The gist is (1) Manhole pipe fittings below,
(2) There is a manhole piping construction method.

(1) A pipe for a manhole, which is fixed to a wall of a manhole and has a first connecting portion to be connected to a piping component outside the manhole and a second connecting portion to be connected to a piping component inside the manhole. In the joint, the second connecting portion has a double-pipe structure including a small-diameter tubular portion connected to the first connecting portion and a large-diameter tubular portion that surrounds the small-diameter tubular portion, and is formed between the small-diameter tubular portion and the large-diameter tubular portion. A pipe joint for a manhole, wherein a connecting end of a piping component arranged inside the manhole is inserted and joined into the formed ring-shaped space.

(2) The second connecting portion of the manhole pipe fitting is penetrated through the wall portion of the manhole, and the tip of the second connecting portion is flush with the inner surface of the wall portion or slightly protrudes inward of the manhole. Fix this manhole fitting to the wall of the manhole, and then insert the connecting end of the piping part inside the manhole into the ring-shaped space between the small-diameter tubular part and the large-diameter tubular part of the second connecting part. A manhole piping enforcement method characterized by being joined.

[Operation] Even if the large-diameter tubular portion of the second connection portion of the manhole fitting is fixed through the wall of the manhole, the pipe inside the manhole is provided in the ring-shaped space between the large-diameter tubular portion and the small-diameter tubular portion. The connection ends of the parts can be plugged in and connected.

Further, since the tip of the second connecting portion is made to hardly project to the inside of the manhole, when the manhole inversion portion is manufactured after the manhole pipe joint is attached to the manhole, the manhole pipe joint 1 is It does not interfere with work. Therefore, the flexibility of the construction procedure in the manhole and the piping work around the manhole becomes greater than in the past.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 and with reference to FIG.

FIG. 1 is a vertical cross-sectional view of a manhole fitting 1. The manhole fitting 1 has a first connecting portion 2 on the left side of the drawing,
The right side is the second connecting portion 3. The second connecting portion 3 has a double pipe structure composed of an inner small diameter tubular portion 4 and an outer large diameter tubular portion 5, and the small diameter tubular portion 4 is connected to the first connecting portion 2. One end of the large-diameter cylindrical portion 5 is joined to the small-diameter cylindrical portion 4, and a ring-shaped space 6 is provided between the small-diameter cylindrical portion 4 and the large-diameter cylindrical portion 5.
Are formed. In addition, a groove 7 for a sealing ring is provided in an annular shape in the vicinity of the end of the first connecting portion 2.

The manhole fitting 1 is used by being fixed to the manhole 50 as follows.

As shown in FIG. 2, a through hole 53 that is sufficiently larger than the second connecting portion 3 of the manhole pipe joint 1 is bored in the upper portion of the peripheral wall portion 51 of the manhole 50 in advance. Then, the second connecting portion 3 of the manhole pipe joint 1 is inserted into the through hole 53 from the outside to the inside of the manhole so that the tip of the second connecting portion 3 projects slightly inward from the inner surface 51a of the peripheral wall portion 51. After positioning, the through hole 53 is filled with mortar 55, the surface of the mortar 55 is finished with drainite 56, and the manhole 50 is fixed to the manhole pipe joint 1.
The tip of the second connecting portion 3 of the manhole fitting 1 may be flush with the inner surface 51a of the peripheral wall portion 51 of the manhole 50.

Since the manhole fitting 1 does not project to the inside of the manhole 50 when installed as described above, even after the manhole fitting 1 is installed, the manhole 50 is installed at the bottom of the manhole 50 at the time of the work. The pipe joint 1 does not get in the way. Of course, as in the conventional case, the manhole pipe joint 1 can be attached after the construction of the invert portion 52.

Next, piping construction around the manhole 50 after the manhole pipe joint 1 is attached to the manhole 50 will be described with reference to FIG.

When connecting the inflow pipe (piping component outside the manhole) 10 to the manhole fitting 1, the manhole fitting 1
After mounting a sealing ring (not shown) in the groove 7 of the first connecting portion 2, the tip of the inflow pipe 10 is inserted into the first connecting portion 2 and attached.

On the other hand, when connecting the auxiliary pipe 20 to the manhole pipe fitting 1, the central connecting end 22a of the substantially T-shaped pipe joint (piping component inside the manhole) 22 is connected to the ring-shaped space of the manhole pipe joint 1. 6 and the outer surface of the small diameter cylindrical portion 4 of the manhole pipe joint 1 and the inner surface of the central connecting end 22a are bonded. At that time, the other two connecting ends 22b and 22c are positioned so as to face in the vertical direction, and the connecting end 22b is directed downward.
The sub-tube 20 is inserted and adhered to, and the sub-tube 20 is arranged vertically along the peripheral wall portion 21 of the manhole 50. And the secondary pipe 20
Join the 90 ° bend pipe 21 to the lower end of the.

In this way, this manhole fitting 1
In contrast, if you attach it in the above-mentioned positional relationship,
The invert portion 52 can be manufactured after the manhole pipe joint 1 is fixed to the manhole 50. As a result, it becomes possible to adopt the construction procedure most suitable for the actual situation such as the progress status of the construction.

The present invention is not limited to the above-mentioned embodiment and various modes can be adopted.

[Effects of the Invention] As described above, according to the present invention, the tip of the second connecting portion of the manhole pipe joint is made to hardly project to the inside of the manhole. The manhole invert part can be manufactured after the manhole pipe joint is attached to the manhole without interfering with the work of. Therefore, there is an excellent effect that the degree of freedom in the construction procedure in the manhole and the piping work around the manhole becomes greater than ever.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a manhole pipe joint, and FIG. 2 is a manhole pipe joint fixed to a manhole. FIG. FIG. 3 is a longitudinal sectional view showing a state in which a conventional manhole pipe joint is fixed to a manhole. 1 ... Manhole pipe joint, 2 ... First connection part 3 ... Second connection part, 4 ... Small diameter cylinder part, 5 ... Large diameter cylinder part, 6 ... Ring space, 10 ... Inflow pipe (Piping parts outside the manhole), 22 …… Pipe fittings (Piping parts inside the manhole), 22a …… Connection end, 50 …… Manhole, 51 …… Peripheral wall part, 51a …… Inner surface.

Claims (2)

[Claims] 1. A first connecting portion which is fixed through the wall portion of the manhole and is connected to a pipe component outside the manhole,
In a manhole pipe joint having a second connecting portion to be connected to a piping component inside a manhole, the second connecting portion is a small diameter tubular portion continuous with the first connecting portion and a large diameter tubular portion surrounding the tubular portion. And a connecting end of a piping component arranged inside the manhole is inserted into and joined to a ring-shaped space formed between the small-diameter cylindrical portion and the large-diameter cylindrical portion. And pipe fittings for manholes. 2. A state in which the second connecting portion of the manhole pipe joint is penetrated through the wall portion of the manhole and the tip of the second connecting portion is flush with the inner surface of the wall portion or slightly protrudes inward of the manhole. And fix this manhole pipe joint to the wall of the manhole, and then insert the connecting end of the piping part inside the manhole into the ring-shaped space between the small-diameter cylinder part and the large-diameter cylinder part of the second connection part. The manhole piping enforcement method, which is characterized in that they are joined together.