JP2001336168A - Fixing ring for flexible joint for connecting pipe of manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing ring for a flexible joint for connecting pipes of a manhole which is excellent in workability and can flexibly cope with the size of the through hole and fluctuation of the shape and securely seal the pipe. SOLUTION: A fixing pipe P of a flexible joint 8 for connection pipes of a manhole 6 widened in the diameter and fixed along the peripheral internal face of the flexible joint 8 that a part of the joint is inserted in the through hole 62 formed on the pedripheral wall of the manhole, is made of an elastic material and provided with a C-shaped circular plate 1 in side view, a locking part 16 formed at one end 19 of the circular pate 1, and a part 10 to be locked formed at the other end 19 of the circular plate 1 to engage with the locking part 16. The outer diameter is reduced while resisting the elasticity of the circular plate 1 to form a circle. The locking part 16 is engaged with the part 10 to be locked. The circular plate 1 can be widened by the elastic restoring force when it is unlocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing ring of a flexible joint for connecting a manhole to a pipe, which is attached to a flexible joint for connecting a pipe to a manhole from the inside and imparts waterproofness to the flexible joint.

[0002]

2. Description of the Related Art Generally, manholes 6 are provided at predetermined intervals in a pipe 7 for drainage or the like. At this manhole, part of the pipe 7 is inserted into a slightly larger through-hole 62 formed in the manhole peripheral wall 61 from the viewpoint of ground displacement, earthquake countermeasures, etc. They are connected by a flexible joint 8 (FIG. 8). The flexible joint 8 is tightened from the outside with an external band 91 to secure a seal between the flexible joint 8 and the pipe 7. On the other hand, at the location of the through hole 62, the fixing ring 92 is expanded from the inside of the flexible joint 8 to push and expand the flexible joint 8, thereby closing the gap between the flexible joint 8 and the through hole wall 62 a of the manhole 6. Thus, the waterproofness at the connection portion is ensured. As for the fixing ring 92, various types have been proposed so far (JP-A-11-13078).
JP-A-10-195900, JP-A-9-195900
No. 144043).

[0003]

However, the conventional product 92
Had the following problems. First, when the through hole 62 formed in the manhole 6 has an elliptical shape, the fixing ring 92 may not be able to expand the diameter following the hole 62, and water may leak. The shape and size of the through hole 62 vary, and the through hole 6
It is said that it is difficult to always form a perfect circle. However,
Since the conventional fixing ring 92 expands concentrically, the perfect circular fixing ring 92 hits the through-hole wall 62a, making sealing difficult. Second, a considerable force is required to spread the fixing ring 92, and in the related art, a hydraulic jack is used (Japanese Patent Laid-Open No. 9-250658) or a screw is used (Japanese Patent Laid-Open No. 11-13078). JP, JP-A-10-195901, JP-A-5-15-1
No. 8490). As a result, the work was troublesome and the work time was long. Third, when the diameter of the through hole 62 becomes large (a in FIG. 9), the radius of the peripheral wall 61 of the manhole 6 influences and cannot be stopped by the fixing ring 92. Of course, if the size of the flexible joint 8 is reduced as shown in FIG. 9 (b), it can be stopped by the fixing ring 92. However, if the size of the flexible joint 8 is reduced, the diameter of the joined pipe is inevitably reduced, causing a problem. Fourth, since the size of the through-holes 62 varies, the conventional fixing ring 92, which expands only to a certain size, is difficult or incomplete to install, and causes water leakage.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and is excellent in workability, and can flexibly cope with variations in the sizes and shapes of through holes, and can fix a flexible joint for pipe connection of a manhole which can be reliably sealed. The purpose is to provide a ring.

[0005]

In order to achieve the above object,
The gist of the invention described in claim 1 is that the manhole pipe connection is fixed in diameter along the peripheral inner surface of the pipe connection flexible joint partly inserted into a through hole formed in the manhole peripheral wall. In the fixing ring of the flexible joint, a side view C made of an elastic body
An annular plate, a locking portion provided at one end of the annular plate, and a locked portion provided near the other end of the annular plate and engaged with the locking portion, While the outer diameter of the annular plate is reduced while being against the elasticity of the annular plate, it is rounded into an annular shape so that the locking portion can be engaged and locked with the locked portion. A fixing ring for a flexible joint for pipe connection of a manhole, wherein the diameter of the annular plate can be expanded.

According to a second aspect of the present invention, the fixing ring of the flexible coupling for connecting a manhole to a pipe according to the first aspect of the present invention further comprises a band covered on the outer periphery of the annular plate. The diameter of the annular plate is increased by releasing the engagement of the locking portion, and the circumferential length of the band wound around the outer periphery of the annular plate is increased. The fixing ring of the flexible coupling for connecting a manhole to a pipe according to the invention of claim 3 forms a small projection at one end of the annular plate in claim 1 or 2, while the other end area of the annular plate has When the annular plate is rolled in a direction in which its outer diameter decreases,
A saw tooth is formed on the side opposed to the one end portion so as to mesh with the small projection, and the saw tooth has a tooth shape that allows the small projection to slide only in the radial direction of the annular plate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a fixing ring of a flexible joint for connecting a manhole to a pipe according to the present invention will be described in detail. 1 to 7 show an embodiment of a fixing ring (hereinafter, simply referred to as a “fixing ring”) of a flexible joint for connecting a manhole to a pipe according to the present invention. FIG. 1 is a partially exploded perspective view, and FIG. FIG. 3 is a partial cross-sectional view showing an engagement state between the locking portion and the locked portion; FIG. 4 is an enlarged perspective view showing an engagement state between the locking portion and the locked portion; 6 is a longitudinal sectional view of the fixing ring, FIG. 6A is an initial state diagram of the annular plate, FIG. 6B is a reduced state diagram of the annular plate in which the locking portion is engaged and locked with the locked portion, and FIG. () Is a state diagram of the annular plate in which the engagement lock of (b) is released. FIG. 7 is a plan view of the fixing ring when the manhole has a large through hole. 2 and 5, illustration of the locking portion and the locked portion is omitted.

The fixing ring P is attached to the flexible joint 8 connecting the pipe 7 to the manhole 6 from the inside, and imparts waterproofness to the flexible joint 8 (see reference numeral 92 in FIG. 8).
The fixing ring P is fixed by expanding the diameter of the fixing ring P along the inner peripheral surface of the flexible joint 8 for pipe connection, a part of which is inserted into the through hole 62 formed in the manhole peripheral wall 61. The fixing ring P includes the annular plate 1, the locking portion 16, the locked portion 10, and the band 4.

The annular plate 1 is formed by press-forming stainless steel spring steel into a C-shape in side view having an opening 12 at the center. The annular plate 1 is shaped like a spring washer with a slightly twisted C-shaped strip in side view (FIGS. 1 and 2). While the outer diameter of the annular plate 1 can be reduced and reduced into a ring shape while resisting the elasticity of the annular plate 1, the annular plate 1 can be expanded by the elastic restoring force of the spring steel when the hand is released. Return to. When the annular plate 1 is in a free state (initial state), it has a C-shape obtained by cutting a part of the ring plate. However, the ring-shaped plate 1 does not have to be literally a C-shape. An annular plate 1 in the state of being overlapped as described above also becomes the annular plate 1 referred to in the present invention. In FIG. 1, one end 19 and the other end 18 are drawn with a slight distance between them so that the respective parts can be easily understood. However, when the two parts overlap, the overlapping part G as shown in FIG. Touch Although only one annular plate 1 is illustrated in FIG. 1, the required number (here, three) is prepared for the fixing ring P (FIG. 5).

In this embodiment, a small projection 15 is formed at one end 19 of the annular plate 1. Then, the other end portion 18 of the annular plate 1
In the area, when the annular plate 1 is rounded in the direction of decreasing the outer diameter,
On the side facing the one end 19, the saw teeth 11 meshing with the small projections 15 are formed. The saw tooth 11 is an annular plate 1
The tooth shape is such that the small projections 15 can slide only in the radially expanding direction. In the sawtooth tooth 11, each tooth profile meshing with the small protrusion 15 is inclined upward in a “∠” shape toward the end (the other end 18) to form a peak 11 a, and then descends almost vertically to form a valley 11 b. I do. On the other hand, the small projection 15 has its end face 15
a protrudes toward the saw tooth 11 perpendicularly to the plate surface of the annular plate 1, and a convex portion inclined downward from the apex to the plate surface position of the annular plate 1 so as to match the “∠” -shaped tooth profile of the saw tooth 11. It has become. Therefore, the small protrusion 15 is the saw tooth 1
1 can be moved in the radially expanding direction of the annular plate 1 by sliding on the upper inclined surface, but cannot be moved in the radially decreasing direction of the annular plate 1, that is, in the direction of reducing the outer diameter of the annular plate 1 and rolling it into an annular shape. When trying to move in the diameter reducing direction of the annular plate 1, the end face 1 of the small projection 15
This is because 5a is caught on the vertical surface forming the valley 11b of the sawtooth tooth 11. The tooth width of the saw tooth 11 matches the width of the strip as shown in the figure.

The locking portion 16 is a stopper that can be engaged with the locked portion 10 provided on the other end portion 18 of the annular plate 1 and locked to the locked portion 10. The engagement between the locking portion 16 and the locked portion 10 becomes possible when the outer diameter of the annular plate 1 is reduced while being rounded into a ring shape while resisting the elasticity of the annular plate 1. The locking portion 16 of the present embodiment is a hook-like projection 16 a that projects in an L shape toward the center of the ring of the annular plate 1 at the lower edge of the one end 19 of the annular plate 1.

The locked portion 10 is a locking device that can engage and lock the locking portion 16. Locked part 10 here
The annular plate 1 is adapted to engage with the hook-shaped protrusion of the locking portion 16.
Is a protruding piece that projects laterally from the inner peripheral edge toward the surface of the annular plate 1 at the one end 19 described above. The locked part 10 is the other end 1
At 8, it is provided at a position slightly in the body from the end. When the outer diameter of the annular plate 1 is small and rounded while resisting the elasticity of the annular plate 1, the attachment position of the locked portion 10 is
6 can be engaged and locked. However, even if the locking portion 16 is engaged with the locked portion 10 against the elasticity of the annular plate 1, when the locking portion 16 is released, the locking plate 16 is separated by the elastic restoring force of the spring steel, and the annular plate 1 expands in diameter. Return to the original state.

The band 4 is a metal band which is covered on the outer periphery of the annular plate 1. The band plate of the present embodiment is substantially C-shaped in side view as shown in FIG. 1, and includes a band portion 41 and a guide portion 42 which is bent in a flange shape inward from both side edges of the band portion. Band 41
Is set to be slightly larger than the total thickness width of the number of annular plates 1 to be accommodated. The band 41 covers the outer periphery 14 of the annular plate 1. In this embodiment, as shown in FIG.
Are used, so that the band 4 can be wound around the outer periphery 14 of the annular plate 1 and covered in a stable state. The C-shaped mouth of the band 4 is slightly widened to cover the outer periphery of the annular plate 1, and then the tongue piece 43 at the end of the band is inserted into the end of the other band 4, and the band 4 is inserted. It is attached to the outer periphery 14 of the annular plate 1 so as to be wound once.

Next, a fixing ring P using the above components
An example of the assembling procedure and the attaching operation of the fixing ring P will be described. First, the outer diameter of the annular plate 1 is reduced while being opposed to the elasticity of the spring steel, and the annular plate 1 is rounded into an annular shape. Three annular plates 1
In each case, the locking portion 16 is engaged and locked with the locked portion 10 to reduce the outer diameter of the annular plate 1. Next, these annular plates 1 are overlaid. At this time, it is preferable to overlap the annular plates 1 with the overlapping portions of the annular plates 1 slightly shifted. This is because the thickness of the three annular plates 1 is leveled. Thereafter, the outer periphery 14 of the annular plate 1 is wound around the band 4. That's it. The assembly of the fixing ring P is completed.

In such a state where the fixing ring P is completed,
The annular plate 1 is smaller than the initial outer diameter and is housed in the band 4. The fixing ring is arranged as it is on the inner peripheral surface of the flexible joint set in the through hole of the manhole.
Thus, the engagement lock between the locking portion 16 and the locked portion 10 is released. Unlocking is performed by scraping off the protruding piece serving as the locked portion 10 with a tool such as a rag or by prying between the locking portion 16 and the locked portion 10 with a driver or the like. Then, the elastic restoring force (elastic repulsive force) of the annular plate 1 which has been forcibly pressed and contracted works, and the annular plate 1 becomes large in an instant and its outer diameter increases. While the small projection 15 slides on the saw tooth 11, the annular plate 1 becomes large. Accordingly, the circumferential length of the band 4 wound around the annular plate 1 increases. When the main fixing ring P is disposed along the inner peripheral surface of the pipe connection flexible joint 8 as described above, the diameter of the annular plate 1 is increased, and the flexible joint 8 is pressed against the through-hole wall 62a of the manhole 6 to seal. I will be. Under the sealing condition, the fixing ring P has not yet completely restored to its original state, and the elastic restoring force strongly presses the flexible joint to enhance the sealing function. By any chance
Even if the elastic restoring force drops due to aging, the small projections 15 are held on the saw teeth 11 and the sealing function is not deteriorated. The fluid flowing in the pipe 7 passes through the portion of the opening 12 and communicates with the reservoir T in the manhole 6 without water leakage. In the present embodiment, since the band body 4 is wound around the outer periphery 14 of the annular plate 1, the sealing performance is further improved. The band 41 of the band 4 presses the flexible joint 8 against the through-hole wall 62a, instead of pressing the flexible joint 8 against the through-hole wall 62a at the thin and thick portion of the annular plate 1, so that line contact to surface contact do not occur. As a result, sealing can be performed more reliably.

Next, the movement of the outer diameter of the annular plate 1 in the mounting operation of the fixing ring P will be described with reference to FIG. Annular plate 1
Based on the outer diameter Dφ when is incorporated in the band (b in FIG. 6), the outer diameter of the annular plate 1 in the free state is, for example, about (D + 13 to 16) φ (a in FIG. 6). . The unit is [mm]. From the free state, an external force is applied against the elasticity of the annular plate 1 as shown by an arrow in FIG. 6 (b), the diameter of the annular plate 1 is reduced to near the minimum diameter, and the locking portion 16 is engaged with the locked portion 10. By doing so, the outer diameter of the annular plate 1 is reduced to Dφ. The annular plate 1 becomes smaller and becomes a fixed ring P wound around the band 4. The fixing ring P is set on the inner peripheral surface of the pipe connection flexible joint 8 as described above in a state where the annular plate 1 is engaged and locked. Thereafter, the engagement lock is released. Although the outer diameter of the annular plate 1 is elastically restored by releasing the engagement lock, the outer diameter of the annular plate 1 is, for example, (D + 10 or less) φ.
(C in FIG. 6). Therefore, the repulsive force of the annular plate 1 still remains, and the annular plate 1 presses the pipe-connecting flexible joint 8 against the through-hole wall. FIG.
Is a concave portion formed by cutting the inner peripheral edge of one end portion 19 of the annular plate 1 into a concave shape. The recess 16b
1 has a configuration in which, when the outer diameter of the annular plate 1 is reduced while resisting the elasticity of the annular plate 1, it can be engaged and locked to the locked portion 10 similarly to the locking portion 16 of FIG.

The diameter of the fixing ring P constructed as described above can be instantaneously expanded by releasing the engagement between the locking portion 16 and the locked portion 10 by using a tool or the like. Excellent in properties. Locking part 16 and locked part 10
When the fixing ring P in which the annular plate 1 in which the engagement ring is locked is covered with the band body 4 is commercialized, the engagement lock is released only with a rag or the like at the installation site of the fixing ring P. It becomes very easy. At the time of attachment, when the engagement lock of about one or two fixing rings P is released, the positional deviation of the flexible joint 8 for pipe connection is corrected, and then, the engagement locks of the remaining fixing rings P are released. Thus, a displacement at the time of mounting can be avoided. Since the annular plate 1 still has an elastic restoring force even when the diameter of the fixing ring P is expanded, the elastic joint 8 is moved to the manhole 6 by using the elastic restoring force.
Can be pressed and sealed against the through-hole wall 62a. Since the sealing is performed by the strong elastic repulsive force of the spring steel, there is no fear of water leakage. Further, when the band 4 is covered on the outer periphery of the annular plate 1, the outer periphery of the fixing ring P becomes the band 41 of the band 4, so that the surface of the band 41 is formed on the perforated wall 62 a of the manhole 6. As it comes to be pressed, the water stopping performance is further improved. The gap between the flexible joint 8 and the through-hole wall 62a is reliably filled. Further, when the diameter of the through hole 62 becomes large as shown in FIG. 9A, the hole cannot be stopped by the conventional fixing ring 92. However, in the present invention, as shown in FIG. If a certain band 4 is adopted, water can be stopped without difficulty. In addition, as described above, the saw tooth 11 and the small protrusion 15
Is formed, even if the elastic restoring force of the spring steel relating to the annular plate 1 is reduced and the outer diameter of the annular plate is to be reduced, the small projections 15 are held by the saw teeth 11 to prevent this. P can exert a sealing function for a long time.

The present invention is not limited to the embodiment described above, but can be variously modified within the scope of the present invention depending on the purpose and application. Annular plate 1, locking part 16, locked part 1
The shape, size, number, material, etc. of the band 0, the band 4, and the like can be appropriately selected according to the application. The locking portion 16 and the locked portion 10 need only be able to engage and lock against each other against the elasticity of the annular plate 1.
With respect to the shapes of the locking portion 16 and the locked portion 10 shown in the embodiment, both can be replaced.

[0019]

As described above, the fixing ring of the flexible joint for connecting a manhole to a pipe according to the present invention has an excellent effect that the diameter can be easily expanded and the size and shape of the through hole can be flexibly handled. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing an embodiment of a fixing ring of a flexible joint for connecting a manhole to a pipe according to the present invention.

FIG. 2 is a side view of an annular plate.

FIG. 3 is a partial sectional view showing an engagement state between a locking portion and a locked portion.

FIG. 4 is an enlarged perspective view showing an engagement state between a locking portion and a locked portion.

FIG. 5 is a longitudinal sectional view of a fixing ring.

6A is an initial state diagram of the annular plate, and FIG. 6B is a diagram of a reduced diameter state of the annular plate in which the locking portion is engaged and locked with the locked portion.
(C) is a state diagram of the annular plate from which the engagement lock of (b) is released.

FIG. 7 is a plan view of the fixing ring when the diameter of the through hole is large.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Annular plate 10 Locked part 14 Outer periphery 11 Saw tooth 15 Small projection 16 Locking part 18 Other end 19 One end 4 Band 6 Manhole 62 Through hole 8 Flexible joint for pipe connection P Fixing ring

Claims (3)

[Claims] 1. A fixing ring for a flexible connection for manhole connection, the diameter of which is fixed along the inner peripheral surface of the flexible connection for pipe connection, a part of which is inserted into a through hole formed in the peripheral wall of the manhole. A C-shaped annular plate made of an elastic body, a locking portion provided at one end of the annular plate, and a engaged member provided near the other end of the annular plate and engaged with the locking portion. And a stop,
While the outer diameter of the annular plate is reduced while being against the elasticity of the annular plate, it is rounded into an annular shape so that the locking portion can be engaged and locked with the locked portion. A fixing ring for a flexible joint for pipe connection of a manhole, wherein a diameter of an annular plate can be expanded. 2. The apparatus according to claim 2, further comprising: a band body covered on an outer periphery of the annular plate, wherein the annular plate is expanded in diameter by releasing the engagement between the locking portion and the locked portion. 2. The fixing ring for a flexible joint for pipe connection of a manhole according to claim 1, wherein the circumference of the wound strip is increased. 3. A small projection is formed at one end of the annular plate, and at the other end region of the annular plate, when the annular plate is rolled in a direction in which the outer diameter decreases, the one end is formed. The manhole according to claim 1 or 2, wherein a saw tooth is formed on the opposite side so as to mesh with the small projection, and the saw tooth has a tooth shape that allows the small projection to slide only in the radial direction of the annular plate. Fixing ring for flexible joint for pipe connection.