JP3821593B2 - Ring expansion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ring expansion device that expands a fitting ring for a pipe joint that imparts sufficient water sealability to a flexible pipe joint that connects a manhole and a connecting pipe.
[0002]
[Prior art]
Usually, manholes scattered in piping systems such as drainage are flexible so that they do not break or leak even if an external force such as an earthquake is applied to the mounting holes in which the upstream and downstream pipes are pierced through the concrete peripheral wall. Are connected via flexible pipe joints made of a rubber material or the like.
FIG. 5 is a cross-sectional view of the main part of the manhole and the connecting pipe in a state where the connection is completed, and FIG. 6 is a front view showing the fitting ring 6 for pipe joint and the attachment ring expanding device 13 for expanding the ring 6.
[0003]
A conventional fitting ring 6 for a pipe joint is formed by fitting a part of a flexible pipe joint 4 having flexibility into an attachment hole 2 that is formed through the peripheral wall of the manhole 1, and further, on the inner peripheral surface of the pipe joint 4. The pipe joint mounting ring 6 is expanded concentrically with the pipe joint 4, thereby sealing between the outer peripheral surface of the pipe joint 4 and the inner surface of the mounting hole 2. On the other hand, the end portion on the side opposite to the manhole of the pipe joint 4 is tightened so that the outer peripheral surface of the pipe joint 4 is bound to the connection pipe 3 inserted into the pipe joint 4 by another attachment ring 5. The connection was complete.
[0004]
For example, as disclosed in Japanese Patent Application Laid-Open No. 10-195900, the pipe joint mounting ring 6 is formed integrally with a flange portion 8 along a circumferential edge thereof, and further, both ends after the expansion. The hoop portion 7 is formed in an annular shape with an overlap region 13 sufficient to enable locking of the portions 7a and 7b, and further, the inner peripheral side end portion of the hoop portion 7 in the overlap region OL 7b and the vicinity thereof, as shown in enlarged view in FIGS. 7 and 8, the flange portion 8 is removed to avoid contact with the flange portion 8 at the outer peripheral side terminal portion 7a of the hoop portion 7. The nail | claw bridge | crosslinked between the both inner side walls of the outer peripheral side terminal part 7a of the said hoop part 7 by arrange | positioning the several ratchet-shaped nail | claw part 9 on the inner peripheral surface of the said inner peripheral side terminal part 7b vicinity. The claw portion 9 is formed in the receiving portion 10 so that it can be locked in a reverse direction. It had been.
[0005]
On the other hand, the mounting ring expansion device 13 is, for example, as disclosed in Japanese Patent Laid-Open No. 10-195901, via a beam portion 14 and a first pivot 17 and a second pivot 18 along the longitudinal direction of the beam portion 14. The first leg portion 15 and the second leg portion 16 are swingably suspended, and extend from one end portion of the beam portion 14 toward the axis of the second pivot 18 along the longitudinal direction of the beam portion 14. A sliding screw portion 19 for sliding the second leg portion 16 along the leg sliding spans SL, a first support shaft 21 of the first leg portion 15 and a second support shaft 22 of the second leg portion 16. And an extension screw portion 20 that extends in parallel with the sliding screw portion 19 and swings and expands the second leg portion 16 along the leg swing span swan SW.
[0006]
The attachment ring expanding device 13 appropriately performs the leg sliding span slan SL by the sliding screw part 19 and the leg swinging span SW by the extension screw part 20 according to the expansion diameter of the pipe joint attachment ring 6. The first leg portion 15 and the second leg portion 16 are slid and expanded while adjusting, and the fitting ring 6 for pipe fitting is attached to each of the extended leg receiving portions 11 and 12 disposed in the vicinity of the both end portions 7a and 7b. By bringing the end portions 15a and 16b of the respective leg portions into contact with each other, the fitting ring 6 for pipe fitting is expanded to a predetermined diameter, so that the outer peripheral surface of the pipe fitting 4 and the inner surface of the fitting hole 2 are sealed. I was trying.
[0007]
[Problems to be solved by the invention]
However, the attachment ring expansion device 13 concentrates the expansion force from the terminal portions 15a, 16b of the respective leg portions to the respective expansion leg receiving portions 11, 12, so that each of the expansion leg receiving portions 11, 12 is provided. As a result, the pipe fitting mounting ring 6 cannot be expanded to a predetermined diameter, and the sealing performance between the outer peripheral surface of the pipe joint 4 and the inner surface of the mounting hole 2 may be significantly reduced. .
[0008]
The present invention eliminates the above-mentioned problems of the prior art, and provides a mounting ring expansion device that can easily handle manhole mounting holes and various variations in the diameters of pipe fittings or variations in manufacturing in the same dimension and can be easily mounted. It is intended to provide.
[0009]
[Means for Solving the Problems]
An object of the present invention is to insert a part of a flexible pipe joint into a mounting hole provided in a peripheral wall of a manhole and to make a pipe concentrically with the pipe joint along the inner peripheral surface of the pipe joint. A ring expansion device that expands a joint attachment ring via an expansion ring and seals an outer peripheral surface of the pipe joint and an inner surface of the attachment hole; the ring expansion device comprising: a beam portion; a length of the beam portion; A first leg and a second leg suspended in a swingable manner along a first pivot and a second pivot, respectively, and a first support shaft and a second leg of the first leg. An extension screw portion extending between the second support shafts so as to be substantially parallel to the beam portion and swinging and expanding the both leg portions along the leg swing swing span; and lower end portions of the both leg portions. First and second locking claw portions disposed; and the expansion ring is disposed in front of both end portions of the annular hoop body. It is accomplished by a ring expansion apparatus characterized by comprising a first and a second locking claw portion provided with engageable locking claw receiving portion.
[0010]
Furthermore, this object of the present invention is achieved by a ring expansion device in which the expansion ring is formed by disposing each expansion handle in the vicinity of each locking claw receiving portion.
[0011]
Furthermore, the object of the present invention is achieved by a ring expansion device in which the expansion ring is pivotally supported by a hinge portion so that any one of the locking claw receiving portions is pivoted.
[0012]
[Action]
In the mounting ring expanding device of the present invention, a part of the pipe joint having flexibility is inserted into the mounting hole that is pierced through the peripheral wall of the manhole, and the pipe joint extends along the inner peripheral surface of the pipe joint. A ring expansion device that expands the fitting ring for a pipe joint concentrically with the expansion ring and seals an outer peripheral surface of the pipe joint and an inner surface of the attachment hole; The beam part, the first leg part and the second leg part suspended swingably along the longitudinal direction of the beam part via the first pivot and the second pivot, respectively, and the first leg part Extending between the first support shaft of the second support shaft and the second support shaft of the second leg portion so as to be substantially parallel to the beam portion, the both leg portions swinging and expanding along the leg portion swinging span. The extension screw portion and the first and second locking claws disposed at the lower end portions of the both leg portions The expansion ring includes the locking claw receiving portion capable of engaging the first and second locking claw portions with both end portions of the annular hoop body. An outer peripheral surface of the annular hoop body of the expansion ring expanded by a ring expansion device is brought into contact with substantially the entire peripheral area of an inner peripheral surface of the pipe joint mounting ring with substantially the same expansion force. The ring is expanded to a predetermined diameter.
[0013]
Furthermore, in the ring expansion device according to the present invention, the expansion ring is formed by disposing the expansion handles in the vicinity of the locking claw receiving portions, so that the expansion ring enters the fitting ring for fitting at the start of expansion. In order to facilitate the mounting operation of the expansion ring, the diameter of the expansion ring is once manually reduced below the diameter of the fitting ring for fittings by the expansion handles.
[0014]
Furthermore, in the ring expansion device according to the present invention, the expansion ring is configured such that any one of the locking claw receiving portions is pivotally supported by the hinge portion so that the locking claw is supported by the hinge portion. By rotating any one of the receiving portions and shortening the effective circumference of the annular hoop body of the expansion ring, the diameter of the expansion ring is further reduced than the diameter of the fitting ring for fittings.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the mounting ring expansion device of the present invention will be described in detail below with reference to the accompanying drawings. In addition, about the member which is common in the conventional attachment ring for pipe joints mentioned above, it demonstrates using the same code | symbol.
FIG. 1 is a front view of the ring expansion device 50 and the expansion ring 30 of the present invention immediately before the start of the expansion operation of the pipe fitting mounting ring 6, and FIG. 2 is just before the end of the expansion operation of the pipe fitting mounting ring 6. 3 is a front view of the ring expansion device 50 and the expansion ring 30 according to the present invention, FIG. 3 is an enlarged front view of the main parts of the ring expansion device 50 and the expansion ring 30 according to the present invention in FIG. 2, and FIG. FIG. 6 is a perspective view showing one locking claw receiving portion 36 of the expansion ring 30 and its periphery.
[0016]
As with the conventional pipe joint mounting ring 6 described above, the pipe joint mounting ring 6 targeted by the ring expansion device 40 of the present invention is also flexible in the mounting hole 2 formed through the peripheral wall of the manhole 1. A part of the pipe joint 4 is inserted and expanded concentrically with the pipe joint 4 along the inner peripheral surface of the pipe joint 4, so that the gap between the outer peripheral surface of the pipe joint 4 and the inner surface of the mounting hole 2 is increased. It is intended to seal.
Further, the fitting ring 6 for a pipe joint is formed so that the flange portion 8 is integrally formed along the circumferential end edge thereof, and further, the expanded end portions 7a and 7b can be locked. The hoop portion 7 is formed in an annular shape having a wrap region OL. Further, the inner peripheral side terminal portion 7b of the hoop portion 7 in the overlap region OL and the vicinity thereof are formed by removing the flange portion 8. While avoiding contact with the flange portion 8 at the outer peripheral side terminal portion 7a of the hoop portion 7, a plurality of ratchet-like claws 9 are disposed on the inner peripheral surface in the vicinity of the inner peripheral side terminal portion 7b. Thus, the claw portion 9 is formed on the claw receiving portion 10 which is bridged between both inner side walls of the outer peripheral side terminal portion 7a of the hoop portion 7 so as to be able to be locked in a non-reverse manner.
[0017]
On the other hand, the ring expansion device 40 of the present invention includes a beam portion 41 and a first leg portion 42 that is swingably suspended along a longitudinal direction of the beam portion 41 via a first pivot 44 and a second pivot 45, respectively. And extending between the second leg 43 and the first support shaft 46 of the first leg 42 and the second support shaft 47 of the second leg 43 so as to be substantially parallel to the beam portion 41. An expansion screw portion 48 that swings and expands both the leg portions 42 and 43 along the leg portion swinging span SW, and first and second engagement members disposed at the lower end portions 42a and 43a of the both leg portions 42 and 43, respectively. The pawl portions 50 and 51 are provided. Reference numeral 50a denotes a bolt through hole.
[0018]
In addition, the expansion ring 30 of the present invention includes each locking claw receiving portion 35, which can engage the first and second locking claws 50, 51 of the ring expansion device 40 with both end portions of the annular hoop body. 36, and a side wall of one of the locking claw receiving portions 35 is provided with a bolt through hole 35a on the same axis as the bolt through hole 50a of the first locking claw portion 50. The first locking claw portion 50 can be fixed to the locking claw receiving portion 35 in advance.
In order to facilitate the expansion operation of the pipe joint mounting ring 6, it is preferable to dispose the expansion handles 38 and 39 in the vicinity of the locking claw receiving portions 35 and 36. Furthermore, the expansion ring 30 can further reduce the diameter of the expansion ring 30 by pivotally supporting any one of the locking claw receiving portions 35 and 36 by a hinge portion 37.
[0019]
Further, as shown in FIGS. 3 and 4 in an enlarged manner, the one locking claw receiving portion 36 is formed on the inner peripheral surface in the vicinity of one end portion 31a of the hoop portion 31 that occupies most of the annular hoop body. The fixed hoop 33 is welded to the inner peripheral surface near the one end 34a of the turning hoop 34 that is pivotally supported in the direction of the arrow CC via the hinge 37.
The extension handle 39 is disposed on a member of the hinge portion 37 attached to the upper surface of the fixed hoop portion 33, and extends in the width direction from the fixed hoop portion 33 with a length that allows manual operation. .
[0020]
The other locking claw receiving portion 35 is held on the inner peripheral surface near the other end portion 32b of the fixed hoop portion 32 welded on the inner peripheral surface in the vicinity of the other end portion 31b of the hoop portion 31. The extension handle 38 is disposed at the rear of the other locking claw receiving portion 35.
In addition, the vicinity of the one end portion 32a of the fixed hoop portion 32 is located above the other end portion 31b of the hoop portion 31 so as to avoid contact with the plurality of ratchet-shaped claws 9. is doing.
[0021]
In the ring expansion device 40 of the present invention configured as described above, first, the diameter of the expansion ring 30 in a natural state is temporarily set for the pipe joint by the expansion handles 38 and 39 of the expansion ring 30 at the expansion start stage. After manually reducing the diameter of the mounting ring 6 to be equal to or less than the diameter of the mounting ring 6 and inserting the expansion ring 30 into the diameter of the fitting ring 6 for fittings, a nut portion 49 of the expansion screw portion 48 of the main body of the ring expansion device 40. Is rotated by using a jig such as a spanner, and the first and second leg portions 42 and 43 are swung and expanded along the leg swirling span swan SW.
The first and second locking claws 50, 51 disposed at the lower ends 42 a, 43 a of the legs 42, 43 are recessed portions in the locking claw receiving portions 35, 36 of the expansion ring 30. When the rotation of the expansion screw portion 48 is continued, the outer peripheral surface of the annular hoop portion 31 eventually expands to substantially the same area as the inner peripheral surface of the fitting ring 6 for fittings. The pipe fitting mounting ring 6 is expanded to a predetermined diameter by contacting with force.
[0022]
Further, when the diameter of the fitting ring 6 for pipe fitting according to the present invention is relatively small, the one locking claw receiving portion 36 is pivoted and folded around the hinge portion 37 to substantially form the expansion ring 30. After shortening the peripheral length, the diameter of the expansion ring 30 is reduced by the expansion handles 38 and 39.
In the expansion ring 30 according to the present invention, any one of the respective locking claw receiving portions 35 and 36 may be pivotally supported by the hinge portion 37, but each of the locking claw receiving portions 35 is supported. , 36 are formed so as to be rotatable, no inconvenience arises.
[0023]
【The invention's effect】
The ring expansion device of the present invention described above has the following new effects. That is, in the mounting ring expanding device of the present invention, a part of the pipe joint having flexibility is inserted into the mounting hole that is pierced in the peripheral wall of the manhole, and along the inner peripheral surface of the pipe joint, A ring expansion device for expanding the mounting ring for a pipe joint concentrically with a pipe joint through the expansion ring and sealing an outer peripheral surface of the pipe joint and an inner surface of the mounting hole; The apparatus includes the first leg part and the second leg part that are swingably suspended through the first pivot and the second pivot, respectively, along the longitudinal direction of the beam part, and the first leg. Extending to be substantially parallel to the beam portion through the first support shaft of the leg portion and the second support shaft of the second leg portion, the both leg portions are swung along the leg swing span. The first and second screw portions disposed at the lower end portions of the both leg portions And the expansion ring includes the locking claw receiving portion capable of engaging the first and second locking claw portions with both end portions of the annular hoop body. Therefore, the outer peripheral surface of the annular hoop body of the expansion ring expanded by the ring expansion device abuts substantially the entire peripheral area of the inner peripheral surface of the pipe joint mounting ring with substantially the same expansion force, and the tube The pipe fitting mounting ring can be expanded to a predetermined diameter without damaging any member of the fitting mounting ring.
[0024]
Furthermore, in the ring expansion device according to the present invention, the expansion ring is formed by disposing the expansion handles in the vicinity of the locking claw receiving portions, so that the expansion ring enters the fitting ring for fitting at the start of expansion. In order to facilitate the mounting operation of the expansion ring, the diameter of the expansion ring can be once manually reduced below the diameter of the fitting ring for fitting by the expansion handles.
[0025]
Furthermore, in the ring expansion device according to the present invention, the expansion ring is configured such that any one of the locking claw receiving portions is pivotally supported by the hinge portion so that the locking claw is supported by the hinge portion. It is possible to further reduce the diameter of the expansion ring than the diameter of the fitting ring for fitting by rotating any one of the receiving portions and shortening the effective circumference of the annular hoop body of the expansion ring. Became.
[Brief description of the drawings]
FIG. 1 is a front view of a ring expansion device and an expansion ring of the present invention immediately before starting an expansion operation of a fitting ring 6 for a pipe joint.
FIG. 2 is a front view of the ring expansion device and the expansion ring according to the present invention immediately before the end of the fitting expansion operation for a pipe joint.
FIG. 3 is an enlarged front view of a main part of the ring expansion device and the expansion ring of the present invention in FIG. 2;
FIG. 4 is a perspective view showing one locking claw receiving portion and its periphery of the expansion ring of the present invention.
FIG. 5 is a cross-sectional view of main parts of a manhole and a connecting pipe in a state where connection is completed.
FIG. 6 is a front view showing an attachment ring for a pipe joint and a conventional attachment ring expansion device for expanding the ring.
7 is an enlarged plan view showing a main part of the fitting ring for a pipe joint in FIG. 6. FIG.
8 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manhole 2 Mounting hole 3 Connection pipe 4 Pipe fitting 5 Another mounting ring 6 Pipe fitting mounting ring 7 Hoop part 8 Flange part 9 Claw part
10 Nail holder
11 Extension leg holder
12 Extension leg holder
OL overlap area
13 Conventional mounting ring expansion device
14 Beam section
15 First leg
16 Second leg
17 Axis 1
18 Second Axis
19 Sliding screw part
20 Expansion screw
21 First spindle
22 Second spindle
SL leg sliding span
SW Leg swinging span
30 Expansion ring of the present invention
31 Hoop section
32 Fixed hoop
33 Fixed hoop
34 Swivel hoop
35 Claw receiving part
36 Claw receiving part
37 Hinge
38 Expansion handle
39 Expansion handle
40 Ring expansion device of the present invention
41 Beam section
42 First leg
43 Second leg
44 Axis 1
45 Axis 2
46 First spindle
47 Second spindle
48 Extension thread
49 Nut
50 First locking claw
51 Second locking claw

Claims (3)

A portion of the flexible pipe joint (4) is fitted into the mounting hole (2) provided in the peripheral wall of the manhole (1), and the pipe joint extends along the inner peripheral surface of the pipe joint (4). A ring that expands the fitting ring for pipe fitting (6) concentrically with (4) via the expansion ring (30), and seals the outer peripheral surface of the pipe fitting (4) and the inner surface of the fitting hole (2). An expansion device (40),
The ring expansion device (40) is suspended swingably along a longitudinal direction of the beam portion (41) and the beam portion (41) via a first pivot (44) and a second pivot (45), respectively. The first leg (42) and the second leg (43), the first support shaft (46) of the first leg (42), and the second support shaft (47) of the second leg (43). ) Extending threadedly extending substantially parallel to the beam part (41) and extending the leg parts (42, 43) along the leg part swinging span (SW) (48) And first and second locking claws (50, 51) disposed at the lower ends (42a, 43a) of the legs (42, 43).
The expansion ring (30) includes a locking claw receiving portion (35, 36) capable of engaging the first and second locking claw portions (50, 51) with both end portions of the annular hoop body. A ring expansion device characterized by comprising: The ring expansion according to claim 1, characterized in that the expansion ring (30) comprises an expansion handle (38, 39) arranged in the vicinity of the respective locking claw receiving portion (35, 36). apparatus. 3. The expansion ring (30) is pivotally supported by one of the locking claw receiving portions (35, 36) so as to be pivotable by a hinge portion (37). Ring expansion device.

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