JPS6231750Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a branch pipe, also called a collared socket pipe, used to connect a sewage attachment pipe to a sewer main pipe.

In general, pipe installation is the most important part of sewer pipe cleaning work, and pipes must be laid as specified and carried out to prevent water leaks. In other words, for example, sewage installation pipes that connect rainwater or sewage basins on roads with main sewer pipes are generally made of hard-fired ceramic pipes, but recently hard vinyl chloride pipes have been used. The pipe is approximately perpendicular to the center line of the main sewer pipe when viewed in plan, and the joint part is approximately 60 degrees downstream from the center line of the main pipe. Regulations have been established that the slope be upward and the gradient must be 10% or more. Therefore, when installing pipes, instead of digging the pipes one by one while joining them, the area from the main sewer pipe to the square is completely excavated, and then the sewer installation pipes are joined while adjusting the slope. It is essential that we continue to do so. In other words, when installing pipes, it is important to center each pipe. For this reason, various types of sewage pipes, such as straight pipes, curved pipes, and branch pipes, are prepared, and workers are required to perform predetermined installation while centering the pipes.

By the way, conventional branch pipes have the following inconveniences when performing centering work. That is, first of all, to give an overview of conventional general facilities, in Figures 1 and 2, when connecting the main sewer pipe 1 and the rainwater basin 2, a straight pipe 3 and a bent pipe 4 are used to install the sewer. Configure the tube. Here, the bent pipe 4 and the main sewer pipe 1 are joined via a branch pipe 6 having an arcuate plate called a collar or skirt 5. That is, a predetermined hole is bored in the main sewer pipe 1, the skirt 5 of the branch pipe 6 is positioned around the hole, and the skirt 5 and the main sewer pipe 1 are connected to each other.
Glue the outer circumferential surface of the More specifically, as shown in FIG. 2, the structure of the branch pipe 6 is made by air blow molding a semi-hardened vinyl chloride resin sheet and cutting it horizontally to form a semicircular skirt 5 and the center of the skirt 5. A connecting pipe 9 made of cured vinyl chloride and having a rubber ring 8 is adhered to the flange 7 with a bonding agent. Therefore, the socket 10 of the branch pipe 6 faces diagonally with respect to the main sewer pipe 1. That is, the center line a of the connecting pipe 9 is inclined at about 60 degrees in the downstream direction c with respect to the center line b of the sewer main pipe 1. In other words, it is designed to flow in at an angle of 60°. Further, the branch pipe 6 is connected to the rubber ring 8 through the rubber ring 8, for example.
A 30° bent pipe 4 is inserted and connected, and the sewage installation pipe is laid at right angles to the main pipe when viewed from above.

By the way, the branch pipe 6 generally includes the sewer main pipe 1.
(60° shape) with respect to the center line b of the main sewer pipe, as shown in the example shown in Figure 2, and one where the center line of the branch pipe is perpendicular to the center line of the main sewer pipe (not shown). Two types of branch pipes are commercially available: Natsutamono (90° shape).

On the other hand, as mentioned above, the sewage installation pipe is at right angles (α = 90°) to the center line of the main sewer pipe when viewed from above.
Because there are regulations that must be put in place,
The 60° branch pipe 6 must have a 30° diameter as shown in Figure 2.
A curved pipe 4 of ° is required. However, during the installation work in this case, the 30° bent pipe 4 is connected to the branch pipe 6.
When the bent pipe 4 is inserted into the socket 10 of
Since the direction of the bent pipe 4 can be freely changed within the rainwater basin, it is difficult to determine the direction of the bent pipe 4 toward the rainwater basin 2, which makes it difficult to center the branch pipe 4 and the rainwater basin 2.

In the case of a 90° branch pipe, centering work is easy during installation work, but since the center line of the branch pipe is perpendicular to the center line of the main sewer pipe, it does not comply with the above-mentioned sewerage installation regulations. not compatible.

Therefore, this invention was devised to eliminate the problems with the conventional 60° branch pipe, and essentially eliminates the need for a 30° bent pipe, although it has a downstream slope (60°) with respect to the main sewer pipe. The purpose is to provide a branch pipe for

The present invention is a sewage installation branch pipe for connecting a branch pipe to a main sewer pipe, and includes a skirt having a cylindrical wall portion shape that fits onto the outer wall of the main pipe, and a socket for connecting to the branch pipe. a neck connecting between the socket and the skirt, the socket having one end connected to the neck so that its central axis is at an angle of about 90° to the central axis of the main pipe; The neck is connected to the main pipe with its central axis at an angle of approximately 60° to the central axis of the main pipe, and The present invention relates to the branch pipe for a sewage pipe, characterized in that the cross section of the neck portion along a plane parallel to a tangent to the outer circumference of the pipe is circular.

Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the accompanying drawings. In FIG. 3, the center line a' of the flange 7 of the skirt 5 of the branch pipe 6 is inclined at an angle of about 60 degrees with respect to the center line b of the main sewer pipe. The center line a″ in 10 is perpendicular to the center line of the main sewer pipe 1.The lower part of the socket 10 is slightly enlarged to form a stepped portion 11, but the stepped portion 11 is the same. The skirt 5 is formed on a horizontal surface, and is bonded to the cut horizontal edge 12 of the flange 7 of the skirt 5 so that the entire edge is in contact with it.Therefore, the skirt 5 and the connecting pipe 9 are firmly bonded. Therefore, the socket 10 of the branch pipe 6 and the skirt 5 are formed by the double-walled neck formed by the flange 7 and the lower cylindrical portion of the stepped portion 11 of the connecting pipe 9. The shorter the neck, the more stable the branch pipe 6 will be relative to the main pipe, but if the cross section of this neck is a curved pipe with a circular generatrix, the bend angle will be approximately 60°. In order to have this, the neck becomes too long and the stability of the branch pipe 6 deteriorates.
Therefore, in the present invention, the neck consisting of the flange 7 and the lower part of the connecting pipe 9 is made into a straight pipe, and instead, the central axis a' of the neck is approximately 60 degrees from the central axis b of the main pipe.
The cross section along the plane parallel to the main pipe central axis b of the neck and the tangent to the main pipe outer periphery (direction perpendicular to the plane of the paper) that intersects at an angle of ° is a circle A, and therefore the central axis of the neck By making the cross section along the plane orthogonal to a′ into an elliptical shape B, the socket 10 having the central axis a″ orthogonal to the main pipe axis b can be
It can be connected to the mains with a short neck with an angle of inclination of approximately 60° to the mains.

In summary, the present invention, in a branch pipe used when connecting a sewer attachment pipe to a sewer main pipe, makes the center line of the flange provided on the skirt of the branch pipe inclined with respect to the center line of the main pipe. The center line of the socket of the connecting pipe inserted and bonded to the flange is made perpendicular to the center line of the main pipe, so that any horizontal cut surface of the connecting pipe is circular. Because it is a branch pipe, the opening where the sewage attachment pipe joins is inclined with respect to the inside of the main sewer pipe, so that the effluent from the sewage attachment pipe can flow smoothly into the main sewer pipe.
Moreover, since the center line of the outlet of the branch pipe is perpendicular to the center line of the main pipe, the number of parts can be reduced by eliminating the need for a bent pipe, which was at least necessary in a conventional branch pipe. When laying pipes from branch pipes glued to the main sewer pipe to rainwater basins, etc., it has various benefits such as making it easier to center the pipes, simplifying construction work in narrow residential areas, etc., and making it possible to accurately lay the specified pipes. It is. Further, since the flange and the connecting pipe inserted into and bonded to the flange are bonded evenly over the entire circumferential surface, they are firmly bonded, improving the reliability of the branch pipe.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a general sewerage pipe facility.
FIG. 2 is an enlarged plan view of FIG. 1, and FIG. 3 is a partially sectional side view of a branch pipe according to an embodiment of the present invention. 1... Main sewer pipe, 5... Skirt, 6... Branch pipe, 7... Flange, 9... Connecting pipe, a, a',
a″……center line, b……center line.

Claims (1)

[Scope of utility model registration request] A branch pipe for connecting a branch pipe to a main sewer pipe, which has a skirt having a cylindrical wall portion that fits onto the outer wall of the main pipe, a socket for connecting to the branch pipe, and the socket. and a neck for connecting with the skirt, and the socket is provided so that its central axis is at an angle of about 90° with respect to the central axis of the main pipe, and one end is connected to the neck. The central axis of the neck is about 60 degrees with respect to the central axis of the main pipe.
The neck is connected to the main pipe at an angle of Branch pipe for the said sewage installation pipe.