JP2543622B2 - Manhole pipe fittings and manhole piping construction method. - Google Patents

Description

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

[Conventional technology]

Some manholes have a structure that prevents sewage and the like flowing into the manhole from directly flowing down the inner bottom surface of the manhole and eroding it.

FIG. 3 shows an example of a conventional structure of this kind, which is called a so-called inner auxiliary pipe structure. Manhole 50
A pipe joint 60 having a substantially T-shape is fixed to the upper portion of the peripheral wall portion 51. The first connecting portion 61 to be connected to the inflow pipe (outside pipe component) 10 outside the manhole 50 in the pipe joint 60 is
After the through hole formed in the peripheral wall portion 51 of the manhole 50 is previously penetrated from the inside to the outside and positioned, the mortar is packed and fixed in the through hole. In addition, in the pipe joint 60, the second connecting portion 62 located inside the manhole 50 has its axis oriented in the vertical direction, and the lower portion of the second connecting portion 62 extends vertically along the inner surface of the peripheral wall portion 51 of the manhole 50. A secondary pipe (inner piping component) 20 installed in the direction is connected. The auxiliary pipe 20 has a 90 ° bend pipe 21 at its lower end, which is attached to the manhole 50.
Is located on the invert portion 52 provided at the bottom of the. The vent pipe 21 allows the sewage that has flowed down the sub pipe 20 to flow horizontally into the manhole 50 by changing its flow direction.

[Problems to be Solved by the Invention]

In the pipe fitting method used for the conventional manhole and the manhole piping construction method using the same, in order to connect the inflow pipe 10 to the manhole 50, the pipe joint 60 must be fixed to the peripheral wall portion 51 before that. Must be side dish. 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 becomes narrower due to the protrusion of the second connecting portion 62, and the manhole
It becomes very difficult to make the invert part 52 on the bottom of the 50. Therefore, traditionally, the manhole was first
The invert portion 52 of 50 is 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 and the auxiliary pipe 20 is connected to the second connecting portion 62. Connecting,
I had no choice but to adopt the construction procedure. 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 technology, and the purpose thereof is to provide a manhole pipe joint that can perform a manhole and a pipe work around the manhole in a desired construction procedure, and a manhole. It is about to provide a pipe construction method.

[Means for solving the problem]

The present invention has been made to achieve the above object, and the gist thereof is the following (1) pipe joint for manhole,
(2) There is a manhole piping construction method.

(1) A pipe joint 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 second connection portion,
The manhole is connected to the first connecting portion and is formed of a large-diameter cylindrical portion having an inner diameter substantially equal to or larger than the outer diameter of the cylindrical portion. A pipe joint for a manhole, characterized in that the connection ends of the pipe parts arranged in the are inserted and joined.

(2) The second connecting portion of the pipe fitting for manhole is made to penetrate the wall portion of the manhole so that the tip of the second connecting portion is flush with the inner surface of the wall portion or slightly protrudes inward of the manhole. This manhole fitting is fixed to the wall of the manhole, and then the connecting end of the piping part inside the manhole is inserted into the large-diameter cylindrical part of the second connecting part for joining. Pipe construction method.

[Action]

Even if the second connection portion of the manhole pipe joint is fixed through the wall of the manhole, the connection end of the piping component inside the manhole can be inserted and connected to the large-diameter cylindrical portion of the second connection portion.

Further, since the tip of the second connecting portion is made to hardly project into the inside of the manhole, the manhole pipe joint is used for the work when the manhole invert part is manufactured after the manhole pipe joint is attached to the manhole. Will not get in the way. Therefore, the flexibility of the construction procedure in the manhole and the piping work around the manhole becomes greater than in the past.

〔Example〕

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.
In the manhole pipe joint 1, the left side in the drawing is the first connecting portion 2 and the right side is the second connecting portion 3.

The second connecting portion 3 has a large-diameter cylindrical portion 5 which is formed by inserting and joining one end of a large-diameter cylindrical body having an inner diameter substantially equal to the outer diameter of the cylindrical portion 4 to the cylindrical portion 4 connected to the first connecting portion 2. Is formed.

As described above, the second connecting portion may be configured by forming the large-diameter tubular portion 5 by expanding the one end of the tubular portion 4 without inserting the large-diameter tubular body. The inner diameter of the large-diameter tubular portion 5 may be larger than the outer diameter of the tubular portion 4.

Further, the length of the large-diameter cylindrical portion 5 may be any length as long as it can securely hold the connecting portion of the piping component arranged inside the manhole inserted and joined here, and the thickness of the peripheral wall portion of the manhole. It does not matter whether it is smaller or larger.

In addition, a groove 6 for a sealing ring is provided near the end of the first connecting portion 2.
Are projected annularly.

In this embodiment, the manhole fitting 1 is made of a hard plastic such as hard vinyl chloride, and sand grains are attached to one surface of the outer peripheral surface of the large-diameter cylindrical portion 5 although not shown. The so-called sanding process is performed so that the mortar or the like can be easily bonded.

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

In advance, as shown in FIG. 2, the peripheral wall portion 51 of the manhole 50.
A through hole 53 larger than the second connection portion 3 of the manhole pipe joint 1 is bored in the upper part of the. 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 an adhesive 55 such as mortar to fix the manhole pipe joint 1 to the manhole 50. 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.

When installed as described above, the manhole fitting 1 hardly projects into the manhole 50. Therefore, even after the manhole fitting 1 is installed, the manhole fitting 1 for the manhole 50 is installed at the bottom of the manhole 50. 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, regarding the pipe construction around the manhole 50 after attaching the manhole fitting 1 to the manhole 50,
Description will be made with reference to the drawings.

When connecting the inflow pipe (piping component outside the manhole) 10 to the manhole fitting 1, after mounting a sealing ring (not shown) in the groove 6 of the first connecting portion 2 of the manhole fitting 1. , Insert the tip of the inflow pipe 10 into the first connecting portion 2 to attach it.

On the other hand, in the case of connecting the auxiliary pipe 20 to the manhole fitting 1, the central connecting end 22a of the substantially T-shaped fitting (piping component inside the manhole) 22 is bonded to the manhole fitting 1 with an adhesive. The large-diameter cylindrical part 5 of the
And the inner surface of the large-diameter cylindrical portion 5 of the manhole pipe joint 1 and the outer surface of the central connecting end 22a are bonded. At that moment,
The other two connecting ends 22b and 22c are positioned so as to face in the vertical direction, and the auxiliary pipe 20 is inserted and bonded to the downwardly connecting end 22b, and the auxiliary pipe 20 is attached to the peripheral wall portion 51 of the manhole 50. Along the top and bottom. Then, the 90 ° bend pipe 21 is joined to the lower end of the auxiliary pipe 20.

At the connecting end 22b of the substantially T-shaped pipe joint 22, the auxiliary pipes 20 and 90
° After joining the bend pipe 21, the central connection end of this pipe fitting 22
22a may be inserted into the large-diameter cylindrical portion 5 of the pipe fitting 1 for manholes and adhered thereto.

In this way, this manhole fitting 1 is
If the manhole pipe joint 1 is fixed to the manhole 50, the invert portion 52 can be manufactured by attaching the manhole pipe 50 in the above-mentioned positional relationship. as a result,
It becomes possible to adopt the construction procedure most suitable for the actual situation such as the progress status of construction.

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

〔The invention's effect〕

As described above, according to the present invention, the manhole pipe joint and the piping component inside the manhole are separate bodies, and the tip of the second connection portion of the manhole pipe joint is prevented from protruding almost inside the manhole. Since it is fixed to the peripheral wall of the manhole, the manhole pipe joint does not interfere with the work inside the manhole, and the manhole invert part can be manufactured after the manhole pipe joint is attached to the manhole.

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 one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a manhole fitting, and FIG. 2 is a manhole fitting showing a state of being fixed to a manhole. FIG. 3 is a vertical sectional view showing a state in which a pipe joint used in a conventional manhole is fixed to the manhole. DESCRIPTION OF SYMBOLS 1 ... Manhole pipe fitting, 2 ... 1st connection part, 3 ... 2nd connection part, 4 ... Cylindrical part, 5 ... Large diameter cylinder part, 10 ... Inflow pipe (manhole outside piping part), 22 ... Pipe fitting ( Piping parts inside the manhole), 22a ... connection end, 50 ... manhole, 51 ... peripheral wall part, 51a ... inner surface.

Claims (2)

(57) [Claims] 1. 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 pipe joint, the second connecting portion is continuously provided in a tubular portion connected to the first connecting portion, and is configured by a large-diameter tubular portion having an inner diameter substantially equal to or larger than the outer diameter of the tubular portion. A pipe joint for a manhole, wherein a connecting end of a piping component arranged inside the manhole is inserted and joined to the second connecting portion. 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. The manhole pipe fitting is fixed to the wall of the manhole, and then the connecting end of the piping component inside the manhole is inserted into the large-diameter tubular part of the second connecting part for joining. Manhole piping construction method.