JP2829496B2 - Universal joint used for small-diameter PVC manholes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint used for a small-diameter PVC manhole or a small-diameter PVC square.

[0002]

2. Description of the Related Art As is well known, at present, concrete manholes are still used on public roads even after PVC pipes are used for sewer mains.
Therefore, the appearance of PVC manholes is strongly demanded.

Accordingly, the present applicant has developed a small diameter manhole made of PVC, which has been substantially scaled up, based on many years of experience with a small diameter made of PVC for home use. The product has already been provided.

[0004] By the way, in the case of such a small-diameter manhole made of PVC, there is a demand for a small-diameter manhole having a universal joint as in the case of a small-diameter PVC made of PVC, and therefore, a small-diameter manhole shown in FIG.

[0005] This will be described with reference to a prototype example shown in FIG.
Reference numeral 1 denotes an injection or blow-molded PVC manhole body, which is provided with a check tube joint 2 upward, a universal joint 3 on the upstream side, and a port 4 on the downstream side.

The structure of the universal joint itself is the same as that shown in, for example, Japanese Patent Publication No. 61-53597 and Japanese Patent Publication No. 1-23933. Using a T-shaped masu body,
This T-shaped horizontal part is further blow-molded to make a shell 5,
The core 7 is pressed and inserted into the shell 5 via an O-ring 6 so that the core 7 can be slid freely and closely.
In addition, the sewage pipe 8 on the upstream side is joined by TS. This core 7
Is provided with a stopper 9 like a normal TS bonding structure.

However, in the PVC manhole having the universal joint 3, the sewage pipe 8 on the upstream side is set to θ ≒ with respect to the horizontal.
When used upward with a maximum swing angle of 15 °, there is a problem that a waste pool 10 is generated at the bottom of the shell 5.

On the other hand, in a sewage system having a universal joint for connecting pipes or a universal joint, a proposal has been made to eliminate such a waste reservoir 10. For example, in Japanese Utility Model Publication No. 4-1436, in a universal joint for pipe connection, a shell for joining a sewer pipe on the downstream side, and this shell via an O-ring,
And a core pressed and inserted so as to slide tightly in a free direction, and an upstream sewer pipe is inserted up to the stopper of the core in this core. So that it is higher than the axis of the sewer pipe on the downstream side. Therefore, even if the core is rotated in a free direction on a horizontal plane, no waste is generated in the shell.

However, in the proposed universal joint for pipe connection, when the drainage pipe on the upstream side is used upward with a maximum swing angle of about 15 ° with respect to the horizontal, waste remains in the shell. In addition, Jiko 61-170
No. 93 discloses, in a sewage masquerade having a universal joint, a shell integrally molded with a main body,
A core pressed and inserted so as to slide freely in a free direction via an O-ring, and a drain pipe on the upstream side is inserted into the core up to a stopper of the core, and
The bottom of the shell is made to be the same arc and horizontal as the arc bottom of the main body so that the bottom of the shell has no dirt recess.

[0010] However, in the sewage tank having the proposed universal joint, since the bottom of the shell is formed in an arcuate and horizontal shape, there are the following problems. Since the lower half of the entire circumference of the shell is not spherical, the core may come off from the shell. If the core comes off from the shell, the O-ring is interposed, so the core is pressed and inserted into the shell again. That can be tedious on site. Of the contact positions of the shell and the core, the contact position on the core side changes due to close sliding, so that when an O-ring is fitted on the core side, a portion that does not seal occurs,
The O-ring is to be fitted on the shell side, which makes it difficult to form the O-ring groove, thus impairing the sealing performance.

[0011]

SUMMARY OF THE INVENTION Accordingly, the present invention is to completely solve the various problems of the prior art, and the gist of the present invention is as follows. In a PVC manhole body provided with a horizontal upstream side universal joint and a horizontal downstream side drain pipe joint, respectively, the universal joint is provided on a shell, a core having a normal spherical portion, and an O provided on the core side. When the core is not provided with a stopper and a drain pipe connecting short pipe for inserting the drain pipe on the upstream side without a stopper is inserted and adhered to make the pipe horizontal, the short pipe is slightly projected into the manhole body. A universal joint used for a small-diameter manhole made of PVC, which is characterized in that a waste pool is not formed by the above-mentioned method. Freely Hands, in PVC manholes respectively, shell with conventional spherical portion the universal joint, constituted by an O-ring provided in the core and the core side,
When the core is not provided with a stopper, and a short pipe for connecting a sewer pipe for inserting a sewer pipe on the upstream side is inserted and adhered to be horizontal,
3. A universal joint used for a small-diameter PVC manhole or the like, wherein the waste pipe is not formed by slightly projecting the short pipe into the inspection cylinder, and 3) the ceiling side of the core according to claim 1 or 2. A universal joint used for a small-diameter PVC manhole, wherein an upstream side of the core is regulated so as not to be lower than horizontal by providing a stopper which comes into contact with the shell. Or a universal joint used for a small-diameter PVC manhole or the like, wherein the PVC manhole of No. 3 is used for a PVC house.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a sectional view of a principal part of a first embodiment of the present invention, FIG. 2 is a sectional view of a principal part of a second embodiment, and FIG. 3 is a sectional view of a principal part of a third embodiment. The illustration and description of the same parts as those shown in FIG.

These embodiments are suitable for a small-sized manhole made of PVC having a universal joint buried at a depth of about 2 m under a relatively narrow public road. Sewage pipe to connect is 100-200mm
φ, the inspection cylinder of this manhole is preferably 300 mmφ in size.

In FIG. 1, reference numeral 11 denotes a part of an inspection tube provided in an injection-molded PVC manhole. An opening 12 is provided in a tube wall of the inspection tube 11, and the opening 12 is provided with an injection member. The fitting portion 14 of the formed shell 13 is internally fitted with an adhesive, and the curved flange 15 of the shell 13 is bonded to the outer peripheral surface of the opening 12. That is, the shell 13 includes the normal spherical portion 16 and the connecting pipe inclination permitting portion 1.
In addition to 7, on the opposite side, the fitting portion 14 and the curved flange 15 are provided. In this shell 13,
An injection molded core 19 is inserted via an O-ring 18. The core 19 slides closely against the shell 13 in a free direction as usual.

In this case, the core 19 is not provided with a normally provided stopper (see reference numeral 9 in FIG. 4). A short pipe 20 with a rubber ring socket is inserted into the core 19. Therefore, the spigot 21 of the short pipe 20 with the rubber ring socket is provided when the short pipe 20 is in a horizontal state.
The protruding part slightly protrudes from the inner surface of the inspection tube 11 and is inserted into and adhered to the core 19. Since the stopper is not provided as described above, the notch step 2 is formed on the outer periphery of the core 19 on the inspection cylinder side.
2 can be provided. As a result, even if the adhesive surface with the spigot 21 is extended, interference with the shell 13 does not occur.

By the way, the projecting amount of the spigot 21 can be adjusted even when the short tube 20 is used upward with respect to the horizontal so that the maximum swing angle of θ {15} is possible as usual. Are located on an extension of the inner surface of the inspection tube 11. Of course, if the projecting amount of the short tube 20 is smaller than this,
A waste pool is generated at the bottom of the shell 13, and if it is larger than this, the internal space of the inspection tube 11 will be occupied more.

Further, the short pipe 20 with a rubber ring socket is provided with a rubber ring socket 23 on the opposite side of the spigot 21, and a lip seal 24 is fitted thereto. Therefore, when a sewer pipe (not shown) on the upstream side is inserted into the rubber ring receiving portion 23,
Since a swing angle of about 5 ° is obtained, the universal joint of this embodiment has a swing angle of about 20 ° as a whole. Therefore, in a small-diameter manhole with this universal joint,
At the construction site, the sewer pipe on the upstream side is
Can be connected freely in a range of about 20 ° swing angle, which is very convenient
3. The core 19 and the short tube 20 do not come off.

Next, a second embodiment will be described. FIG.
Is different from the first embodiment in that the fitting portion 1 of the shell 13 is provided on the ceiling side of the cutout step portion 22 of the core 19.
A tongue piece 25 is provided in contact with the inner surface of the core 4, and the tongue piece 25 is used as a stopper to restrict the rotation so that the upstream side of the core 19 does not become lower than horizontal as shown in the figure.

Next, a third embodiment will be described. FIG.
In the third embodiment, the difference between the second embodiment and the second embodiment is that the universal joint is not the inspection cylinder 11 but the manhole body 2.
6 is provided integrally on the upstream side in the horizontal direction.

Next, the operation of these embodiments will be described. In a production factory, an opening 12 is provided in the inspection cylinder 11. On the other hand, a core 19 on which an O-ring 18 is fitted is pressed and inserted into the shell 13. A short pipe 20 with a rubber ring socket is inserted into the core 19 and bonded and bonded. The shell 13 of the universal joint with a short pipe thus assembled is connected to the inspection cylinder 11
And is adhesively bonded.

Next, the inspection cylinder 11 having the universal joint
Alternatively, the manhole body 26 is brought to the construction site, the inspection cylinder 11 is appropriately cut, and connected to the manhole body 26 by, for example, rubber ring bonding. Next, if a sewer pipe on the upstream side is connected to the rubber ring receiving portion 23, a waterfall dropping pipe can be laid within a range of a swing angle of about 20 °.

In each of the above embodiments, a small-diameter PVC manhole is described. However, the present invention is not limited to this, and a small-diameter PVC cavity for home use may be used.

[0023]

According to the present invention, a stopper is not provided on the core of the universal joint, and when a short pipe for connecting a sewer pipe is inserted and bonded to the core to make it horizontal, the core is slightly projected into the manhole body. Therefore, not only the waste pool is not generated, but also the core does not fall out of the shell having the normal spherical portion. Moreover,
As in the case of a normal universal joint, the formation of the O-ring groove becomes easy on the core side, so that the sealability is good (for example,
Even when used at the maximum swing angle of 15 °, there is no portion where sealing is not generated).

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 4 is a diagram showing an example of a conventional prototype.

[Explanation of symbols]

11 ... inspection cylinder, 13 ... shell, 18 ... O-ring, 19 ...
Core, 20 ... short tube

Claims (4)

(57) [Claims] 1. A PVC manhole body provided with an upwardly-examined inspection cylinder joint, a laterally upstream universal joint, and a laterally downstream sewer pipe joint, wherein the universal joint is a normal spherical part. shell with, core and
An O-ring provided on the core side , and a short-circuit for connecting a sewer pipe for inserting a sewer pipe on the upstream side without providing a stopper on the core.
When the horizontally insert bonding the tube to form a waste reservoir by Rukoto is slightly protrude said short tube manhole <br/> the reel body
Universal joint for use in PVC small diameter manhole or the like, characterized in that there is no. 2. A PVC manhole provided with an upwardly inspecting cylinder, a laterally downstream sewage pipe joint, and a laterally universal joint provided on the inspection cylinder, wherein the universal joint has a normal spherical portion. Shell, core and
An O-ring provided on the core side , and a short-circuit for connecting a sewer pipe for inserting a sewer pipe on the upstream side without providing a stopper on the core.
When inserted bonding the tubes to the horizontal shape, a universal joint for use in PVC small diameter manhole or the like, characterized in <br/> that does not form a waste reservoir by Rukoto is slightly protrude the short tube in the inspection tube . 3. The ceiling of the core according to claim 1 or 2 ,
A stopper is provided to abut the well and the upstream side of the core is horizontal.
A universal joint for use in small-diameter PVC manholes, etc., which is regulated so that it does not face downward . 4. A universal joint for use in a small-diameter PVC manhole, wherein the PVC manhole according to claim 1, 2, or 3 is used for a PVC house.