JP2012233322A - Sewerage main-manhole connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewerage main-manhole connection structure whose cylindrical joint is set in a circular mounting hole in the side wall of a manhole, and which is excellent in water-tightness, flexibility and connection strength.SOLUTION: In a sewerage main-manhole connection structure A, a cylindrical joint J which consists of a body rubber 3 having a large-diameter cylindrical part, a small-diameter cylindrical part having a lip 33 around the inner wall face, and a connection part, a large-diameter ring 4 to be internally fitted to the large-diameter cylindrical part, a small-diameter ring 5 to be externally fitted to the small-diameter cylindrical part, and a diameter-shrinkable ring 6 to be fitted into a recessed groove, and which is camber-shaped to advance as extending closer to the upper and lower ends and to retract as extending closer to the right and left ends, approximately to the inner wall shape of a circular mounting hole 11, is fitted through the internal of a manhole 1 into a front end 21, and a gap between the outer periphery of the cylindrical joint J and the inner wall of the circular mounting hole 11 is filled with a manhole filler m. Thus, the cylindrical joint J is set in the circular mounting hole 11.

Description

  The present invention relates to a connection structure between a sewer main and a manhole.

  Patent Document 1 discloses a connection structure between a sewer main and a manhole. Patent Document 2 discloses a rubber manhole joint.

JP-A-6-108525 JP 2002-326552 A

The said patent document 1 has the following subject.
Since the sewer main and the manhole are rigidly connected, they are vulnerable to earthquakes and the connected parts are easily damaged. The said patent document 2 has the following subject.
If the width is shortened so that the rubber manhole joint is hidden in the side hole, the seal portion between the outer periphery of the rubber manhole joint and the inner wall of the side hole is shortened, and the watertightness, flexibility and connection strength are remarkably inferior.

  If the width is increased in order to increase water tightness, flexibility and connection strength, the base end side of the rubber manhole joint will protrude into the manhole and become a protrusion inside the manhole, which may hinder the flow of sewage. It will interfere with maintenance. If the base end side of the rubber manhole joint is shifted outward so that it does not protrude inside the manhole, the tip end side of the rubber manhole joint will protrude greatly outside the manhole, and groundwater and earth and sand will flow into the manhole. It is easy to invite depression of the ground.

  An object of the present invention is to provide a connection structure between a sewer main and a manhole in which a cylindrical joint is accommodated in a circular mounting hole on a side wall of a manhole, and which is excellent in water tightness, flexibility, and connection strength.

(About claim 1)
The cylindrical manhole is embedded substantially vertically and has a circular mounting hole in the side wall.
A cylindrical sewer main is loosely fitted in the circular mounting hole.
A cylindrical joint is fitted into the manhole at the tip of the sewer main.

The cylindrical joint includes a main body rubber, a large-diameter ring, a small-diameter ring, and a reduced-diameter ring, and approximates the shape of the inner wall of the circular mounting hole.
The main rubber includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a lip around the inner wall surface, and a connecting portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion on the distal end side.

A large-diameter ring is fitted into the large-diameter cylindrical portion.
A small diameter ring is fitted on the small diameter cylindrical portion.
A reduced diameter ring is fitted on the outer periphery of the large diameter cylindrical portion.
The main rubber, large-diameter ring, small-diameter ring, and reduced-diameter ring each have a warped shape that advances as it approaches the upper and lower ends of the ring and retreats as it approaches the left and right ends of the ring.

The method for connecting the sewer main and manhole is as follows.
A large-diameter ring is fitted into the large-diameter cylindrical portion of the main rubber, and a small-diameter ring is externally fitted to the small-diameter cylindrical portion of the main rubber. In addition, you may externally fit a small diameter ring to a small diameter cylindrical part previously.
Next, when a reduced diameter ring is fitted to the outer periphery of the large-diameter cylindrical portion of the main rubber, a cylindrical joint is formed.

The sewer main is loosely fitted in the circular mounting hole of the manhole, and the cylindrical joint is fitted from the manhole to the tip of the sewer main.
The diameter-reducing ring reduces the diameter of the main rubber, the large-diameter and small-diameter rings prevent the main rubber from being deformed, and the lip provided around the inner wall surface of the small-diameter cylindrical part presses the outer peripheral surface of the sewer main. The water tightness between the sewer main and the cylindrical joint is ensured. In addition, in view of pressing the outer peripheral surface of the sewer main with the lip, the main sewer main is preferably a vinyl chloride bowl having a smooth surface.

The connection structure between the sewer main and the manhole of claim 1 has the following advantages.
Since the cylindrical joint fits in the circular mounting hole on the side wall of the manhole, it does not become a protrusion inside the manhole, does not hinder the flow of sewage, and does not interfere with maintenance.
Since the seal portion between the outer periphery of the rubber cylindrical joint and the circular mounting hole can be taken long, it is excellent in water tightness, flexibility and connection strength.

(About claim 2)
Since the main body rubber of the cylindrical joint approximates the shape of the inner wall of the circular mounting hole, a normal stainless steel fastening band cannot be used. The reason for this is that when a stainless steel fastening band is used, the stainless steel fastening band protrudes from the main rubber and cannot be tightened (see FIG. 8).
For this reason, after fitting a plurality of arc rings or cut arc rings to the outer circumference of the large-diameter cylindrical portion, the diameter of the arc ring is reduced using a diameter reducing tool, and welding, screwing, and latching are performed. The diameter of the ring is reduced to a single ring by connecting means such as.
Therefore, if the cylindrical joint is manufactured by approximating the inner wall shape of the circular mounting hole, all inner wall shapes can be handled.

(Claim 3)
The gap between the outer periphery of the cylindrical joint fitted at the tip of the sewer main and the inner wall of the circular mounting hole is filled with a manhole filler.
Thereby, the watertightness and connection strength between a cylindrical joint and a manhole are ensured.

(About claim 4)
The cylindrical manhole is embedded substantially vertically and has a circular mounting hole in the side wall.
A cylindrical sewer main is loosely fitted in the circular mounting hole.
A cylindrical joint is fitted into the manhole at the tip of the sewer main.

The cylindrical joint includes a main rubber, a large diameter reduced ring, a large diameter ring, a small diameter reduced ring, and a small diameter ring, and approximates the inner wall shape of a circular mounting hole.
The main rubber is composed of a large-diameter cylindrical portion, a small-diameter cylindrical portion located behind the large-diameter cylindrical portion, a large-diameter cylindrical portion whose diameter increases from the small-diameter cylindrical portion toward the front, and a large-diameter cylindrical portion and a diameter. It has a connection part which connects a large cylindrical part.

A large diameter reduction ring is fitted on the outer periphery of the large diameter cylindrical portion.
A large-diameter ring is fitted into the large-diameter cylindrical portion.
A small diameter reduction ring is fitted on the outer periphery of the small diameter cylindrical portion.
A small diameter ring is fitted into the small diameter cylindrical portion.

  The main rubber, the large diameter reduced ring, the large diameter ring, the small diameter reduced diameter ring, and the small diameter ring each have a warped shape that advances as it approaches the upper and lower ends, and retreats as it approaches the left and right ends of the ring.

The method for connecting the sewer main and manhole is as follows.
A small-diameter ring is fitted into the small-diameter cylindrical portion of the main rubber, and a large-diameter ring is fitted into the large-diameter cylindrical portion of the main rubber. Note that the large-diameter ring may be fitted into the large-diameter cylindrical portion first.
Next, a small diameter reduced ring is fitted on the outer circumference of the small diameter cylindrical portion of the main rubber, and a large diameter reduced ring is fitted on the outer circumference of the large diameter cylindrical portion of the main rubber to form a cylindrical joint. Note that the large-diameter reduced diameter ring may be fitted to the outer periphery of the large-diameter cylindrical portion first.

The sewer main is loosely fitted in the circular mounting hole of the manhole, and the cylindrical joint is fitted from the manhole to the tip of the sewer main.
The small diameter ring reduces the small cylindrical part of the main rubber, the large diameter ring reduces the large cylindrical part of the main rubber, and the large and small diameter rings prevent the main rubber from deforming. To do. This cylindrical joint elastically connects the sewer main to the manhole of the circular mounting hole.

The connection structure between the sewer main and the manhole according to claim 4 has the following advantages.
Since the cylindrical joint fits in the circular mounting hole on the side wall of the manhole, it does not become a protrusion inside the manhole, does not hinder the flow of sewage, and does not interfere with maintenance.
Since the seal portion between the outer periphery of the rubber cylindrical joint and the circular mounting hole can be taken long, it is excellent in water tightness, flexibility and connection strength.

(Claim 5)
Since the main body rubber of the cylindrical joint approximates the shape of the inner wall of the circular mounting hole, a normal stainless steel fastening band cannot be used. The reason for this is that when a stainless steel fastening band is used, the stainless steel fastening band is eroded from the main body rubber, so that fastening cannot be performed.
For this reason, after fitting a plurality of arc rings or cut arc rings to the outer circumference of the large-diameter cylindrical portion and the outer circumference of the small-diameter cylindrical portion, the arc ring is reduced in diameter using a diameter reducing tool. By using connecting means such as welding, screwing and latching, one circular ring is formed into a large diameter reduced ring and a diameter reduced diameter ring.
(About claim 6)
Fill the gap between the outer circumference of the cylindrical joint fitted in the tip of the sewer main and the inner wall of the circular mounting hole and the gap between the inner circumference of the cylindrical joint and the outer wall of the sewer main with the manhole filler. .
Thereby, the watertightness between a cylindrical joint and a manhole, and the watertightness and connection strength between a cylindrical joint and a sewer main are ensured.
In addition, since the gap between the inner periphery of the cylindrical joint and the outer wall of the sewer main is filled with a manhole filler, the water tightness can be maintained even with a fume ridge having an uneven surface of the sewer main.

It is explanatory drawing of the main body rubber | gum of the cylindrical joint used for Example 1 of the connection structure of the sewer main of this invention and a manhole. It is explanatory drawing of the cylindrical joint. It is explanatory drawing which shows the assembly | attachment of the cylindrical joint. It is explanatory drawing which shows a mode that an arc ring is diameter-reduced using a some diameter reducing tool. (A) is explanatory drawing which shows a mode that a cylindrical joint is engage | inserted in a sewer main, (b) is the connection structure of the sewer main and the manhole which concerns on Example 1. FIG. It is explanatory drawing of the main body rubber | gum of the cylindrical joint used for Example 2 of the connection structure of the sewer main and this invention of this invention. It is the connection structure of the sewer main which concerns on Example 2, and a manhole. It is explanatory drawing for demonstrating the reason a stainless steel fastening band cannot be used. In Example 2, it is explained that the large diameter reduced ring and the small diameter reduced ring reduce the diameter of the main rubber so that the outer periphery of the large ring and the inner surface of the large cylindrical portion are pressure-bonded to ensure watertight performance. It is explanatory drawing for doing. It is a side view of a single diameter reducing tool. It is a perspective view of the diameter reducing tool.

The connection structure between the sewer main and the manhole is such that the cylindrical sewer main is loosely fitted in a circular mounting hole drilled in the side wall of a cylindrical manhole that is embedded almost vertically, and approximated to the inner wall shape of the circular mounting hole. A cylindrical joint is inserted from the manhole into the tip of the sewer main.
The cylindrical joint includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a lip around the inner wall surface, a main body rubber having a connecting portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion on the distal end side, and a large-diameter portion. It consists of a large-diameter ring fitted inside the cylindrical portion, a small-diameter ring fitted externally to the small-diameter cylindrical portion, and a reduced-diameter ring fitted on the outer periphery of the large-diameter cylindrical portion. Each of the small-diameter ring and the reduced-diameter ring has a warped shape that advances as it approaches the upper and lower ends and retreats as it approaches the left and right ends.

  The connection structure between the sewer main and the manhole has a cylindrical joint that fits in the circular mounting hole on the side wall of the manhole. Since the seal portion between the outer periphery of the rubber cylindrical joint and the circular mounting hole can be taken long, it is excellent in water tightness, flexibility and connection strength.

Example 1 (corresponding to claims 1 to 3) of the present invention will be described with reference to FIGS.
In the sewer main and manhole connection structure A, a cylindrical sewer main 2 is connected to a circular mounting hole 11 of a cylindrical manhole 1 through a cylindrical joint J. The cylindrical joint J is similar in shape to the inner wall shape of the circular mounting hole 11, and includes a main rubber 3, a large diameter ring 4, a small diameter ring 5, and a reduced diameter ring 6 (see FIG. 2).

  The manhole 1 is embedded in a vertical state in a vertical shaft dug vertically in the ground, and a circular mounting hole 11 is formed in the side wall 12. The circular mounting hole 11 has a size capable of loosely fitting the sewer main pipe 2.

  The main rubber 3 includes a large-diameter cylindrical portion 32 having a positioning concave groove 31 around the outer wall, a small-diameter cylindrical portion 34 having a lip 33 around the inner wall surface, a large-diameter cylindrical portion 32, and a small-diameter cylindrical portion. And a connecting portion 35 that connects the front end 34 to the front end side. The main rubber 3 has a warped shape that advances as it approaches the upper and lower ends of the cylinder and retreats as it approaches the left and right ends of the cylinder (see FIGS. 1 and 3).

A large-diameter ring 4 (made of iron) is fitted into the large-diameter cylindrical portion 32.
The small diameter cylindrical portion 34 is fitted with a small diameter ring 5 (made of iron).
A reduced diameter ring 6 (made of iron) is fitted in the recessed groove 31 of the large diameter cylindrical portion 32.
The large-diameter ring 4, the small-diameter ring 5, and the reduced-diameter ring 6 have a warped shape that advances as it approaches the upper and lower ends of each ring and retreats as it approaches the left and right ends of each ring.

In the present embodiment, the diameter-reducing ring 6 includes a plurality of diameter-reducing tools 61 after fitting a cut arc ring 60 (see FIG. 3) into the concave groove 31 of the large-diameter cylindrical portion 32 of the main rubber 3. (See FIG. 4), the circular ring 60 is reduced in diameter, and is formed into a single ring by welding 62 (connection means) (see FIG. 2).
A gap between the outer periphery of the cylindrical joint J and the inner wall of the circular mounting hole 11 is filled with a manhole filler m (see FIG. 5B).

The sewer main and manhole connection structure A is constructed as follows.
In addition, the front-end | tip part 21 of the sewer main pipe 2 is loosely fitted by the circular attachment hole 11 opened in the side wall 12 of the manhole 1 {refer (a) of FIG. 5}.

As shown in FIG. 3, the large-diameter ring 4 is fitted into the large-diameter cylindrical portion 32 of the main rubber 3, and the small-diameter ring 5 is externally fitted to the small-diameter cylindrical portion 34 of the main rubber 3. An arc ring 60 is fitted into the groove 31 of the large cylindrical portion 32.
The fitting position of each member is such that, for example, the rotational position of the warped main rubber 3 is fixed so that it moves forward as it approaches the upper and lower ends of the cylinder and retreats as it approaches the left and right ends of the cylinder. It is fitted in a state in which the turning positions of the large diameter ring 4, the small diameter ring 5 and the circular ring 60 of the warped shape are matched so as to advance as it approaches the end and retreat as it approaches the left and right ends of each ring.

As shown in FIG. 4, a plurality of diameter reducing tools 61 are used, the circular ring 60, the large-diameter cylindrical portion 32 of the main rubber 3 and the large-diameter ring 4 are sandwiched by the sandwiching portion 64, and the tightening screw 65 is turned to rotate the arc. The arc ring 60 is reduced in diameter until the cut of the ring 60 is closed. In this state, the closed cut is welded 62 (connecting means) to form the reduced diameter ring 6.
The large-diameter ring 4 and the small-diameter ring 5 prevent the main body rubber 3 from being deformed, and the reduced-diameter ring 6 reduces the diameter of the main rubber 3 so that the outer circumference of the large-diameter ring 4 and the inner circumference of the large-diameter cylindrical portion 32 are obtained. The surface is pressure-bonded to ensure watertight performance {see (a) of FIG. 9}.
The diameter reducing tool 61 (made of metal) includes a substantially U-shaped sandwiching portion 64 in which a screw hole is formed in the outer plate 63, and a tightening screw 65 screwed into the screw hole (see FIG. 4). .

Next, the cylindrical joint J fitted with the reduced-diameter ring 6 is fitted into the distal end portion 21 of the sewer main pipe 2 from the manhole 1 (see FIG. 5A).
The reduced diameter ring 6 reduces the diameter of the main rubber 3, the large diameter ring 4 and the small diameter ring 5 prevent the main rubber 3 from being deformed, and a lip 33 provided around the inner wall surface of the small diameter cylindrical portion 34 is a sewer book. Since the outer peripheral surface of the pipe 2 is pressed, water tightness between the sewer main pipe 2 and the cylindrical joint J is ensured. In addition, in view of pressing the outer peripheral surface of the sewer main 2 with the lip 33, the sewer main 2 is preferably a vinyl chloride bowl having a smooth surface.

  Next, the gap between the outer periphery of the cylindrical joint J and the inner wall of the circular mounting hole 11 is filled with a manhole filler m {see FIG. 5 (b)}.

The sewer main and manhole connection structure A of this embodiment has the following advantages.
The tip 21 of the sewer main pipe 2 is loosely fitted in the circular mounting hole 11 opened in the side wall 12 of the manhole 1, and the cylindrical joint J whose outer shape approximates the inner wall shape of the circular mounting hole 11 is fitted in the tip 21. Therefore, the cylindrical joint J is accommodated in the circular mounting hole 11 in the side wall 12 of the manhole 1.
For this reason, the cylindrical joint J does not become a protrusion inside the manhole 1, does not hinder the flow of sewage, and does not disturb maintenance.
In addition, since the seal portion between the outer periphery of the cylindrical joint J and the circular mounting hole 11 can be taken long, the watertightness, flexibility, and connection strength are excellent.

  After fitting the cut arc ring 60 into the groove 31, the arc ring 60 is reduced in diameter using the diameter reducing tool 61, and the reduced diameter ring is made into one ring by welding 62 (connecting means). Therefore, the main rubber 3 can be uniformly tightened. In addition, since the main body rubber 3 of the cylindrical joint J approximates the shape of the inner wall of the circular mounting hole 11, the main rubber 3 cannot be tightened using a normal stainless steel tightening band 30 (see FIG. 8).

  A gap between the outer periphery of the cylindrical joint J fitted into the distal end portion 21 of the sewer main pipe 2 and the inner wall of the circular mounting hole 11 is filled with a manhole filler m. Thereby, the watertightness and connection strength between the cylindrical joint J and the manhole 1 are ensured.

A second embodiment (corresponding to claims 4 and 5) of the present invention will be described with reference to FIGS.
As shown in FIG. 7, in the sewer main and manhole connection structure B, a cylindrical sewer main 2 is connected to a circular mounting hole 11 of a cylindrical manhole 1 via a cylindrical joint K.

  The cylindrical joint K whose outer shape approximates the inner wall shape of the circular mounting hole 11 includes the main body rubber 7, a large diameter reduced ring 81, a large diameter ring 82, a small diameter reduced ring 83, and a small diameter ring 84. Have.

  The manhole 1 is embedded in a vertical state in a vertical shaft dug vertically in the ground, and a circular mounting hole 11 is formed in the side wall 12. The circular mounting hole 11 has a size capable of loosely fitting the sewer main pipe 2.

  The main rubber 7 includes a large-diameter cylindrical portion 72 in which a positioning groove 71 is provided around the outer wall, and a small-diameter cylindrical portion that is provided behind the large-diameter cylindrical portion 72 by providing a positioning groove 73 in the outer wall. 74, a diameter-expanded cylindrical portion 75 whose diameter increases from the small-diameter cylindrical portion 74 toward the front, and a connecting portion 76 that connects the diameter-expanded cylindrical portion 75 and the large-diameter cylindrical portion 72.

A large-diameter reduced-diameter ring 81 (made of iron) is fitted in the concave groove 71 of the large-diameter cylindrical portion 72.
A large-diameter ring 82 (made of iron) is fitted into the large-diameter cylindrical portion 72.
A small-diameter reduced-diameter ring 83 (made of iron) is fitted in the concave groove 73 of the small-diameter cylindrical portion 74.
A small diameter ring 84 (made of iron) is fitted into the small diameter cylindrical portion 74.

The main rubber 7 has a warped shape that advances as it approaches the upper and lower ends of the cylinder, and retreats as it approaches the left and right ends of the cylinder.
Further, the large-diameter reduced ring 81, the large-diameter ring 82, the small-diameter reduced-diameter ring 83, and the small-diameter ring 84 move forward as they approach the upper and lower ends of each ring, and retreat as they approach the left and right ends of each ring. It has a warped shape.

In the present embodiment, the large diameter reduction ring 81 has a plurality of diameter reductions similar to those in the first embodiment after fitting a cut arc ring into the concave groove 71 of the large diameter cylindrical portion 72 of the main rubber 7. A circular ring is reduced in diameter by using a tool, and is formed into one circular ring by welding (connecting means).
In this embodiment, the small diameter reduction ring 83 is formed by fitting a cut arc ring into the concave groove 73 of the small diameter cylindrical portion 74 of the main rubber 7 and then reducing the plurality of diameter reductions as in the first embodiment. A circular ring is reduced in diameter by using a tool, and is formed into one circular ring by welding (connecting means).

  The clearance between the outer periphery of the cylindrical joint K and the inner wall of the circular mounting hole 11 and the clearance between the inner periphery of the cylindrical joint K and the outer periphery of the sewer main pipe 2 are filled with manhole fillers m and n. (See FIG. 7).

The sewer main and manhole connection structure B is constructed as follows.
In addition, the front-end | tip part 21 of the sewer main pipe 2 is loosely fitted by the circular attachment hole 11 opened in the side wall 12 of the manhole 1. FIG.

A large-diameter ring 82 is fitted into the large-diameter cylindrical portion 72 of the main rubber 7, and a small-diameter ring 84 is internally fitted to the small-diameter cylindrical portion 74 of the main rubber 7.
Next, an arc ring to be a large diameter reduced diameter ring 81 is fitted into the concave groove 71 of the large diameter cylindrical portion 72 of the main rubber 7, and the small diameter reduced diameter is inserted into the concave groove 73 of the small diameter cylindrical portion 74 of the main rubber 7. A circular ring to be the ring 83 is fitted.

  The fitting position of each member is such that, for example, the rotational position of the warped body rubber 7 is fixed so that it moves forward as it approaches the upper and lower ends of the cylinder and retreats as it approaches the left and right ends of the cylinder. The warped shape large diameter ring 82, the small diameter ring 84, and the rotation positions of the respective arcuate rings are fitted in such a manner that it advances as it approaches the end and retreats as it approaches the left and right ends of each ring.

A plurality of diameter reducing tools similar to those of the first embodiment are used, the circular ring, the large-diameter cylindrical portion 72 of the main rubber 7 and the large-diameter ring 82 are sandwiched by the pinching portions, and the circular ring is rotated until the cut is closed by turning the tightening screw. Reduce the diameter. In this state, the closed cut is welded (connecting means) to form a large diameter reduced ring 81. Similarly, a plurality of diameter reducing tools similar to those of the first embodiment are used, the circular ring, the small diameter cylindrical portion 74 of the main rubber 7 and the small diameter ring 84 are sandwiched between the sandwiched portions, and the cut is closed by turning the tightening screw. Reduce the diameter of the arc ring to Then, in this state, the closed cut is welded (connecting means) to form a reduced diameter ring 83.
The large diameter ring 82 and the small diameter ring 84 prevent the main body rubber 7 from being deformed, and the large diameter reduced diameter ring 81 and the small diameter reduced diameter ring 83 reduce the diameter of the main body rubber 7.
The large diameter reducing ring 81 reduces the diameter of the large cylindrical portion 72 of the main rubber 7 so that the outer peripheral surface of the large diameter ring 82 and the inner peripheral surface of the large diameter cylindrical portion 72 are pressure-bonded to ensure watertight performance. .
Further, the small diameter reducing ring 83 reduces the diameter of the small diameter cylindrical portion 74 of the main body rubber 7 so that the outer peripheral surface of the small diameter ring 84 and the inner peripheral surface of the small diameter cylindrical portion 74 are pressure-bonded to ensure watertight performance. {See FIG. 9B}.

Next, the cylindrical joint K fitted with the large diameter reduced diameter ring 81 and the small diameter reduced diameter ring 83 is fitted into the distal end portion 21 of the sewer main pipe 2 from the inside 1 of the manhole.
Then, the manhole filling material m is filled in the gap between the outer circumference of the cylindrical joint K and the inner wall of the circular mounting hole 11 and the gap between the inner circumference of the cylindrical joint K and the outer wall of the sewer main pipe 2.

The sewer main and manhole connection structure B of this embodiment has the following advantages.
The tip 21 of the sewer main pipe 2 is loosely fitted in the circular mounting hole 11 opened in the side wall 12 of the manhole 1, and the cylindrical joint K whose outer shape approximates the inner wall shape of the circular mounting hole 11 is fitted in the tip 21. Therefore, the cylindrical joint K is accommodated in the circular mounting hole 11 on the side wall 12 of the manhole 1.
For this reason, the cylindrical joint K does not become a protrusion inside the manhole 1, does not hinder the flow of sewage, and does not disturb maintenance.
Moreover, since the seal part between the outer periphery of the cylindrical joint K and the circular mounting hole 11 can be taken long, the water tightness, the flexible performance, and the connection strength are excellent.

  After fitting a cut arc ring in the concave grooves 71 and 73, each arc ring is reduced in diameter using a diameter reducing tool, and is welded (connecting means) into one circular ring by large diameter reduction. Since the ring 81 and the reduced diameter ring 83 are used, the main rubber 7 can be uniformly tightened. Since the main rubber 7 of the cylindrical joint K approximates the shape of the inner wall of the circular mounting hole 11, the main rubber 7 cannot be tightened using a normal stainless steel tightening band.

A gap between the outer periphery of the cylindrical joint K fitted into the tip 21 of the sewer main pipe 2 and the inner wall of the circular mounting hole 11 and a gap between the inner circumference of the cylindrical joint K and the outer wall of the sewer main pipe 2 Filled with manhole filler m. Thereby, the watertightness between the cylindrical joint K and the manhole 1 and the watertightness between the cylindrical joint K and the sewer main 2 are ensured.
Since the gap between the inner periphery of the cylindrical joint K and the outer wall of the sewer main 2 is filled with the manhole filler m, the water-tightness is maintained even if the surface of the sewer main 2 is uneven. be able to.

The present invention includes the following embodiments in addition to the above embodiments.
a. The reduced-diameter ring, the large-diameter reduced-diameter ring, and the small-diameter-reduced-diameter ring may be an arc ring that is divided into a plurality of parts in addition to the cut arc ring. Further, the connecting means may be screwing, hooking or the like in addition to welding.
b. The large-diameter ring, small-diameter ring, reduced-diameter ring, large-diameter reduced-diameter ring, and small-diameter reduced-diameter ring may be a metal other than iron (eg, stainless steel).
c. The diameter reducing tool may be a single unit (see FIGS. 10 and 11). Moreover, you may use fasteners, such as a lever block and a chain block.

  If this sewer main and manhole connection structure is adopted, the cylindrical joint fits in the circular mounting hole on the side wall of the manhole, so it does not become a protrusion inside the manhole, does not hinder the flow of sewage, and disturbs maintenance. Don't be.

A, B Sewer main and manhole connection structure J, K Cylindrical joint m Manhole filler 1 Manhole 2 Sewer main 3, 7 Body rubber 4, 82 Large ring 5, 84 Small ring 6 Reduced ring 11 Circular mounting Hole 12 Side wall 21 Front end portion 32, 72 Large diameter cylindrical portion 33 Lip 34, 74 Small diameter cylindrical portion 35, 76 Connection portion 60 Arc ring 61 Diameter reducing tool 62 Welding (connection means)
75 Diameter expansion cylinder part 81 Diameter large diameter reduction ring 83 Diameter small diameter reduction ring

Claims (6)

A cylindrical sewer main is loosely fitted in a circular mounting hole opened in the side wall of a cylindrical manhole embedded substantially vertically, and a cylindrical joint approximating the inner wall shape of the circular mounting hole is inserted into the sewer from the manhole. It is a connection structure of a sewer main and a manhole fitted at the tip of a main pipe, and the cylindrical joint is
A main body rubber having a large-diameter cylindrical portion, a small-diameter cylindrical portion in which a lip is provided around an inner wall surface, and a connecting portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion on a distal end side;
A large-diameter ring fitted into the large-diameter cylindrical portion;
A small-diameter ring externally fitted to the small-diameter cylindrical portion;
It consists of a reduced diameter ring fitted on the outer periphery of the large diameter cylindrical portion,
The main rubber, large-diameter ring, small-diameter ring, and reduced-diameter ring each have a warped shape that advances as it approaches the upper and lower ends and retreats as it approaches the left and right ends. Construction.   The reduced diameter ring is welded in a state where a plurality of arc rings or a cut arc ring is fitted to the outer periphery of the large diameter cylindrical portion, and then the arc ring is reduced in diameter using a diameter reducing tool. 2. The sewer main and manhole connection structure according to claim 1, wherein the ring is formed into a single ring by connecting means such as screwing and hooking.   The clearance gap between the outer periphery of the said cylindrical joint fitted in the front-end | tip part of the said sewer main and the inner wall of the said circular attachment hole was filled with the manhole filler, The Claim 1 or Claim 2 characterized by the above-mentioned. Connection structure of the sewer main and manhole. A cylindrical sewer main is loosely fitted in a circular mounting hole opened in the side wall of a cylindrical manhole embedded substantially vertically, and a cylindrical joint approximating the inner wall shape of the circular mounting hole is inserted into the sewer from the manhole. It is a connection structure of a sewer main and a manhole fitted at the tip of a main pipe, and the cylindrical joint is
A large-diameter cylindrical portion, a small-diameter cylindrical portion located behind the large-diameter cylindrical portion, a large-diameter cylindrical portion whose diameter increases from the small-diameter cylindrical portion toward the front, and the large-diameter cylindrical portion and the diameter A main body rubber having a connecting portion for connecting the large cylindrical portion;
A large diameter reduction ring fitted on the outer periphery of the large diameter cylindrical portion;
A large-diameter ring fitted into the large-diameter cylindrical portion;
A small diameter reduction ring fitted to the outer periphery of the small diameter cylindrical portion;
It consists of a small diameter ring fitted inside the small diameter cylindrical part,
The main rubber, the large diameter reduced ring, the large diameter ring, the small diameter reduced ring, and the small diameter ring each have a warped shape that advances as it approaches the upper and lower ends and retreats as it approaches the left and right ends. A sewer main and manhole connection structure.   The large diameter-reducing ring and the small diameter-reducing ring are formed by fitting a plurality of arc rings or cut arc rings to the outer periphery of the large-diameter cylindrical portion and the outer periphery of the small-diameter cylindrical portion. The sewer main and manhole according to claim 4, wherein the circular ring is reduced in diameter by using a diameter tool and is formed into a single ring by a connecting means such as welding, screwing, or hooking. Connection structure.   A manhole is formed between the outer periphery of the cylindrical joint and the inner wall of the circular mounting hole fitted into the distal end portion of the sewer main, and the inner periphery of the circular joint and the outer wall of the sewer main. 6. The sewer main and manhole connection structure according to claim 4 or 5, wherein the structure is filled with a filler.

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