JP2653979B2 - Locking ring of flexible pipe joint for manhole and its mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking ring for a flexible pipe joint for a manhole of a sewer pipe and a device for mounting the same.

[0002]

2. Description of the Related Art A connecting pipe such as an inflow pipe or an outflow pipe is connected to a sewage manhole underground. Since the pipe is damaged due to uneven settlement of the manhole body and the connecting pipe, the connecting portion between the manhole and the connecting pipe has flexibility. Generally, a flexible material such as rubber is used for such a connection portion.
The shape and the manner of engagement with the manhole are various. For example, there are means such as bonding to the outside of the manhole main body and press-fitting into a gap between a hole drilled in the body of the manhole and the outer diameter of the connection pipe. In addition, the flexible pipe joint is formed in a reducer shape, and the thin end of the reducer-shaped pipe joint is closely fitted to the outer diameter of the connection pipe, and the thick end is connected to the manhole. There is a means for loosely inserting the flexible pipe joint into the inside of the pipe mounting hole, and fixing the flexible pipe joint to the manhole by press-fitting the inside of the hole from the inside with an enlarged-diameter ring.

When such a flexible pipe joint is loosely inserted into a connection pipe mounting hole of a manhole and locked with a ring, as disclosed in Japanese Patent Application Laid-Open No. Sho 51-10652, A part of the circumference of the ring for locking the pipe joint is bent in a V-shaped concave shape toward the inner diameter side, and this ring is set at a predetermined position of the flexible pipe joint. Was pressurized from the inside diameter side, and the flexible pipe joint was locked in the manhole hole by means of pushing up the V-shape to expand outward.

[0004]

SUMMARY OF THE INVENTION The above-mentioned JP-A-51-10
In the conventional method as disclosed in Japanese Patent No. 652, it is necessary to precisely control the pressure of the jack. That is, in general, the pressure tends to increase. This can cause cracks in the rubber. If there is a hole at the end of the manhole frame, concrete may be destroyed.

The present invention relates to a ring-shaped device for loosely inserting a flexible pipe joint into a connection pipe mounting hole of a manhole, and then fixing and locking the inserted portion in the hole. It is an object of the present invention to provide a locking ring for a flexible pipe joint for manholes, which is an improvement on the technique disclosed in JP-A-10652, and a device for mounting the same.

[0006]

The present invention takes the following technical means in order to solve the above problems. That is, the locking ring of the present invention is configured such that the large-diameter end of the flexible pipe joint whose outside diameter is fitted to the connecting pipe and the large-diameter end is fitted inside the inside diameter of the connecting pipe mounting hole of the manhole is connected to the connecting pipe of the manhole. A steel flat plate ring to be crimped to the inner surface of the mounting hole, this ring is formed in a ring smaller than the circumference to be crimped, and an expandable cut portion is provided on the circumference of the ring so that the diameter can be expanded, Attached to the outer circumference of the ring over the cut portion is a circumferential extension member, and mounted on both sides of the cut portion on the inner periphery of the ring are means for expanding the ring, and the circumferential extension member has one end connected to the ring.
Fixed to the outer circumference, the other end is pressed against the opposite end of the expanded cut section
A locking ring for a flexible pipe joint for manholes, wherein a locking claw is formed .

[0007] In the locking ring, the circumferential Tsugiashi member is fixed at one end to the outer periphery of the ring, since the other end to form a locking claw jostling the opposite ends of the cutting portions extend, and expanded the ring Later, it can be easily fixed in the expanded state. Also, a plurality of the opposite ends of the locking ring may be provided in the circumferential direction, or a plurality of locking claws may be provided in the circumferential direction,
A plurality of both may be provided, and the diameter of the enlarged diameter of the locking ring can be matched to the site situation, which is preferable.

As means for expanding the diameter of the ring, a Z-shaped wedge receiver which is provided opposite to the inner diameter of the ring on both sides of the cut portion and has a taper in the direction of the ring axis is provided.
As a device for expanding the diameter of the ring using the Z-shaped wedge receiver, the ring is mounted using a mounting device described below.
It is suitable. As the mounting device, a wedge-shaped expansion piece that engages with the taper of the Z-shaped wedge receiver and pushes the taper apart, a reaction force beam provided with a center for advancing the expansion piece, and a reaction force beam A manhole flexible pipe joint mounting device composed of two reaction force claws attached to both ends and locked to the side surface of the ring is used. It is preferable to use a screw device as the extension piece advancing means because it can be easily manually operated in the manhole.

The means for expanding the diameter of the ring may be a protrusion having a rectangular cross section parallel to the ring axis direction, provided on the inner diameter of the ring on both sides of the cut portion. As a device for mounting a flexible pipe joint by expanding the diameter of the ring, a pair of expansion pieces for expanding the ring by expanding the interval between the projections having the rectangular cross section and a base of the pair of expansion pieces are provided. A manhole flexible comprising a clevis for holding the extension pieces openably with each other by pin connection, a moving means for moving the clevis in the radial direction, and a stable seat for receiving a reaction force of the moving means on the pipe. Sex fitting fittings can be used. This clevis moving means is preferably a turnbuckle, because the work in a narrow manhole becomes easy.

[0010]

The locking ring of the flexible pipe joint for manholes according to the present invention is a flat steel ring, which is mounted by expanding its diameter. The ring is provided with a cut portion on the circumference of the ring so that the circumference can be expanded, and the cut portion is expanded and expanded to expand the diameter, and the expanded portion is connected by a circumferential extension member. The circumferential extension member is structured so that the expanded portion can be automatically extended when the diameter of the ring is enlarged. One end of the ring is
Fixed to the outer circumference, the other end is pressed against the opposite end of the cut section
The member is formed with a locking claw.

[0011] In this case, the other end portion of the cut opposite ends,
By mounting a plurality of the hooks individually in the circumferential direction or providing a plurality of hooks in the circumferential direction, the diameter of the enlarged diameter of the hook ring can be adjusted.

Various mechanisms and devices can be used as a means for expanding the cut portion and expanding the diameter of the ring. However, in order to easily perform the construction in the restricted work space inside the manhole at the site, It is appropriate to use a wedge force for expanding a taper provided opposite to both sides of the cut portion. For this purpose, it is preferable to provide a Z-shaped wedge support tapering each other in the ring axis direction across the cut portion. And, the same taper as the opposing taper of this Z-shaped wedge receiver is provided on both sides, and a wedge-shaped expansion piece for expanding this taper is inserted into the tapered portion of the Z-shaped wedge receiver of the ring. Then, a manual attachment device for expanding the taper portion by advancing the expansion piece and expanding the diameter of the ring is used. This mounting device requires a wedge-shaped expansion piece for expanding the taper and a reaction force device for advancing the expansion piece. A screw device such as a screw jack is used as the extension piece advancing means. The screw device is preferable because a strong thrust can be manually generated in a narrow manhole without requiring a hydraulic device or the like.

As a means for expanding the diameter of the ring, instead of the above-mentioned Z-shaped wedge receiver, one of a rectangular cross section parallel to the ring axis direction is used.
It may be a pair of protrusions. As a device for expanding the diameter of the ring, a pair of expansion pieces for expanding the diameter of the ring by expanding the distance between the pair of projections having a rectangular cross section, and opening the pair of expansion pieces by pin-joining the bases thereof. Clevis for holding the legs freely, moving means for moving the clevis in the radial direction,
The diameter can be easily increased by using a mounting device having a stable seat for receiving the reaction force of the moving means on the pipe.

[0014]

FIG. 18 shows a manhole 10 to which the present invention is applied.
0 is a perspective view illustrating the relationship among the connection pipe 101, the connection pipe 101, and the flexible pipe joint 102. The manhole 100 is buried in the ground, and FIG. 18 shows only a member at the base of the manhole. Above this, the skeleton of the manhole is assembled to the surface of the ground. FIG. 19 is a partially enlarged view of the flexible pipe joint 102 of FIG. The flexible pipe joint 102 is formed of a flexible material such as rubber, and has a reducer shape with one end having a small diameter and the other end having a large diameter. The small-diameter end 103 is closely fitted to the connecting pipe 101, and the large-diameter end 104 is connected to the manhole 100 by a locking ring (not shown) mounted in a circumferential groove 105. It is crimped and fixed to the inner surface of the tube mounting hole 106. FIG. 7 shows a longitudinal sectional profile of an embodiment of such a flexible pipe joint, and FIG. 6 is a front view as seen from the large diameter side. Flexible pipe joint 1
In the small-diameter end 103, a seal ridge 107 is formed on the inner diameter of the small-diameter end 103, and the ridge 107 closely fits the outer diameter of the connection pipe 101. A circumferential groove 108 provided on the outer periphery is a seat such as a steel band for tightening the outer diameter of this portion. The large-diameter end portion 104 has a seal ridge 109 on the outer diameter. The seal ridges 109 are pressed together with the packing 110 on the inner surface of the hole of the manhole to form a seal.
A circumferential groove 105 is formed in the inner diameter of the large-diameter end portion 104, and circumferential ridges 111 and 112 are provided at the edge thereof. The large-diameter end portion 104 is crimped and fixed to the inner surface of the connection pipe mounting hole 106 of the manhole 100 by a locking ring mounted in the circumferential groove 105. The notch 113 shown in FIG. 6 is provided for the operation of locking the locking ring.

FIG. 1 is a partial view of a locking ring 1 of a flexible pipe joint for manholes according to an embodiment of the present invention. FIG. 1A is a plan view of the locking ring 1 as viewed from the inside, and FIG. 1B is a side view. FIG. 2 is a side view seen from the same direction as FIG. 1B, but shows a state after the locking ring 1 is expanded in diameter. The locking ring 1 of the flexible pipe joint for manholes of the embodiment is a steel plate ring for pressing the flexible pipe joint 102 to the inner surface of the connection pipe mounting hole 106 of the manhole. FIG. 1 shows a part of the circumference of the locking ring 1. The locking ring 1 is formed as a ring having a circumference smaller than the circumference to be crimped. As shown in FIG. 3, the cross section of the ring 1 is formed in a U-shape with a flange 1a so as to increase the bending rigidity of the ring.

The locking ring 1 has a circumferentially expandable cutting portion 2. When the cut portion 2 is expanded, the diameter of the locking ring 1 can be expanded. On the inner circumference of the ring 1, Z-shaped wedge receivers 3 and 3 a are provided so as to straddle the cut portion 2.
The Z-shaped wedge receivers 3 and 3a are tapered on both sides of the cut portion 2 so as to face each other, and are used for expanding the diameter of the locking ring 1. The Z-shaped wedge bearings 3 and 3a are fixed to the inner diameter of the locking ring 1 by plug welding 4.
The ring 1 has tapers 5 and 5a that face each other in the axial direction. FIG. 4 shows the Z-shaped wedge receiver 3a.
4A is a plan view, and FIG. 4B is a side view. When the Z-shaped wedge receivers 3 and 3a are pushed and spread in the radially expanding direction using a mounting device described later, the cutting portion 2 is expanded, and FIG.
The state shown in FIG.

On the outer peripheral side of the locking ring 1, an arcuate circumferential foot member 11 is attached across both sides of the cutting portion 2. When the cut portion 2 is expanded to expand the ring 1, the circumferential extension member 11 bridges the expanded portion to connect the ring 1, maintains the expanded state of the ring 1, and connects the flexible pipe joint to the manhole. Crimp on the inner surface of the hole. The circumferential extension member 11 has one end 12 fixed to the outer periphery of the ring 1 by plug welding 13. The other end 15 extends along the outer diameter of the ring 1,
A locking claw 14 is formed at a portion near the other end 15. The locking claws 14 abut against the opposing ends of the expanded cutting portion 2 and press against each other, hold the enlarged circumference, and keep the flexible pipe joint pressed against the inner diameter of the manhole hole.

FIG. 5 is a developed view showing details of the circumferential foot member 11, FIG. 5 (a) is a plan view, FIG. 5 (b) is a side view, FIG.
(C) is a front view. One end 12 is provided with a hole 13a for plug welding, and a reinforcement 16 is provided on the side surface of the locking claw 4 to secure the rigidity of the ring 1 in the expanded cut portion 2. I am trying to do it. Next, a mounting device 30 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 8A is a plan view of the mounting device 30, and FIG.
(B) is a side view thereof.

Mounting device 30 for flexible joint for manhole
Comprises an extension piece 31 and means 32 for advancing the extension piece 31
, The reaction force beam 33 and the reaction force claw 34 as main constituent members. The extension piece 31 has a wedge shape which engages with the tapers 5, 5a of the Z-shaped wedge supports 3, 3a shown in FIG. FIG.
5A is a rear view, FIG. 5B is a plan view, and FIG. 5C is a view taken along the line CC in FIG. The extension piece 31 is a forward means 3
A second mounting portion 41 is provided at the rear end and has a tapered edge 42 on the side that forms a wedge. This edge is shown in FIG.
A groove 43 is provided as shown in FIG.
3 is a taper 5, 5 of the Z-shaped wedge receiver 3, 3a shown in FIG.
a. The advancing means 32 is a screw rod that is screwed into the female screw at the center of the reaction force beam 33, and is twisted by the handle 36 to move the extension piece 31 forward and backward with respect to the reaction force beam 33. The reaction force beam 33 has reaction force claws 34 attached to both ends thereof with pins 38. The tip of the reaction claw 34
It has hooks 37.

The method of using this device is as follows.
FIG. 10 is an explanatory diagram showing a use state of the mounting device 30,
(A) is a plan view, (b) is a side view showing a portion of the expansion piece 31, and (c) is a side view showing a reaction force claw 34. The ring 1 is set in the concave groove 105 of the flexible pipe joint 102 shown in FIG. 12, and the flexible pipe joint 102 is inserted into the connection pipe mounting hole 106 of the manhole 100. FIG. 10 (c)
As shown in FIG. 10, the reaction force claw 34 of the mounting device 30 is hooked on the flange 1 a of the ring 1, and as shown in FIG.
The extension piece 31 is engaged with the Z-shaped wedge receiver 3a. By turning the handle 36 at the rear of the attachment device 30, the extension piece 31 is
When the robot is advanced leftward toward (a), the reaction force beam 3
3 supports the reaction force of the extension piece 31, and the extension piece 31 moves the Z-shaped wedge supports 3, 3a in the direction of pushing and separating. The wedge holders 3 and 3a are open on both sides, and the locking ring 1 is
Expanded from and expanded. At the position where the locking ring 1 has spread to a predetermined size, the locking claw 14 of the arcuate circumferential foot member 11 engages with the extended end of the ring 1 as shown in FIG. After that, even if the expansion piece 31 of the attachment device 30 is retracted to loosen the wedge, the ring 1 does not return to the original diameter. In this embodiment, the outer diameter is 10 mm
I made it bigger.

The ring 1 with the cut portion 2 expanded has a flexible pipe joint crimped and fixed to the inner surface of the connection pipe mounting hole of the manhole, thereby securely locking the flexible pipe joint. Next, a technique for expanding the diameter of the locking ring 1 using another mounting device 50 shown in FIG. 11 will be described. FIG. 14 is a plan view of an expanded portion showing a state of (a) before expansion and (b) after expansion of the locking ring 1 of another embodiment.

As means for expanding the diameter of the ring 1, the Z
Instead of the wedge holder, protrusions 6 having a rectangular cross section parallel to the axial direction of the ring 1 are provided on both sides of the cut portion 2. FIG.
It is explanatory drawing which shows the use condition of the ring attachment device 50 which expands this ring 1. FIG. A stabilizing seat 55 for taking a reaction force of the mounting device 50 is provided on the inner diameter of the ring 1, and a pair of expansion pieces 51, 51 are engaged with the projections 6, 6 in an open state. The ring mounting device 50 pushes the clevis 52 by a turnbuckle 53 using a screw 54. As shown in FIG. 13, since the two extension pieces 51, 51 are pin-coupled to the clevis 52 so as to be freely opened, the extension pieces 51, 51 push out the projections 6, and as a result, the ring 1 can be enlarged. FIG. 12 shows a state after the diameter expansion.

By appropriately designing the angle formed by the expansion pieces 51 before and after the diameter expansion, the ring mounting apparatus 50 can generate a very large force in the expansion direction with respect to the pressing force due to the turnbuckle. it can. Next, FIG.
Examples in which the enlarged diameter of the locking ring 1 can be adjusted to 5, 16, and 17 will be described. FIG. 15 shows a state before such expansion of the locking ring 1. In this embodiment, a second opposing end 62 projecting in the circumferential direction from the opposing end 61 is attached to the opposing end 61 of the cut portion 2 of the locking ring 1 separately from the opposing end 61. This second
The opposite end 62 of the cut portion is attached so as not to prevent the opposite end 61 of the cut portion from engaging with the locking piece 14, and is formed so as to be able to lock itself with the locking piece 14. I have. This attachment is fixed by welding. FIG.
Reference numeral 6 denotes a state in which the diameter of the locking ring 1 is expanded, and the facing end 61 and the locking piece 14 of the circumferential extension member 11 are locked. If the pipe joint is sufficiently crimped in this state, the mounting of the locking ring is completed. If the crimping is insufficient, the diameter is further increased, and as shown in FIG.
2 and the locking piece 14 are locked, and the second stage is fixed. In the embodiment, the second stage is fixed such that the outer diameter of the locking ring is expanded by 2 mm. If necessary, this enlarged dimension can be multi-stepped. Further, in the above-described embodiment, the example in which the number of the opposing ends is increased is described.

According to the embodiment shown in FIGS. 15 to 17, it is possible to adjust the enlarged diameter of the locking ring 1 according to the actual situation.

[0025]

As described above, the locking ring of the flexible pipe joint for manholes according to the present invention is configured as described above, so that the diameter expansion size can be determined in advance to one or more. Does not expand. Therefore, no abnormal force is applied to the rubber of the flexible pipe joint and the manhole body. Installation work can be easily performed in factories and burial sites. The lock ring of the present invention is stably mounted, as is apparent from its structure, but can be removed after setting. Therefore, if the opening position of the connection pipe mounting hole is wrong, the flexible joint can be removed and used again.

[Brief description of the drawings]

FIG. 1 is a partial view of a locking ring of a flexible pipe joint for manholes of an embodiment before the diameter of the locking ring is increased.

FIG. 2 is a partial side view of the locking ring of the flexible coupling for manholes according to the embodiment after the diameter of the locking ring has been increased;

FIG. 3 is a cross-sectional view of a locking ring of a flexible pipe joint for manholes according to an embodiment.

FIG. 4 is an explanatory view of a Z-shaped wedge support.

FIG. 5 is an explanatory view of a circumferential extension member.

FIG. 6 is a front view of a flexible fitting.

FIG. 7 is a longitudinal section profile of a flexible fitting.

8A is a plan view and FIG. 8B is a side view of the mounting device.

FIG. 9 is a three-sided view of the extension piece.

FIG. 10 is an explanatory diagram showing a use state of an extension piece.

FIG. 11 is an explanatory diagram showing a use state of another extension piece.

FIG. 12 is an explanatory diagram showing a use state of the extension piece of FIG. 11;

FIG. 13 is a partial perspective view of the extension piece of FIG. 11;

FIG. 14 is a front view of (a) before expansion and (b) after expansion of the locking ring of the embodiment.

FIG. 15 is a front view of a locking ring according to another embodiment before expansion.

FIG. 16 is a front view of the locking ring of another embodiment after the first-stage expansion.

FIG. 17 is a front view of a locking ring according to another embodiment after a second-stage expansion.

FIG. 18 is a perspective view showing a relationship between a manhole and a connection pipe.

FIG. 19 is a partially enlarged view of a flexible pipe joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Locking ring 2 Cutting part 3 Wedge receiver 4 Plug welding 5 Taper 6 Projection 12 One end 11 Circular joint foot member 14 Locking claw 13 Plug welding 16 Reinforcement 15 Other end 31 Expansion piece 30 Mounting device 33 Reaction force beam 32 Forwarding means 36 Handle 34 Reaction Force Claw 38 Pin 37 Hook 43 Groove 41 Mounting Part 50 Mounting Device 51 Extension Piece 52 Clevis 53 Turnbuckle 54 Screw 55 Stability Seat 61 Opposite End 62 Second Opposite End 101 Connection Pipe 100 Manhole 103 End 102 Flexibility Fitting 105 Circumferential groove 104 End 107 Projection 106 Mounting hole 109 Projection 108 Circumferential groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuo Nakazato 751 Shin Maruko-cho, Nakahara-ku, Kawasaki City Nichicon Corporation (72) Inventor Takeo Tsukada 751 Shin-Maruko-cho, Nakahara-ku Kawasaki City Nichicon Corporation (56) References JP-A-5-18490 (JP, A)

Claims (8)

(57) [Claims] 1. A large-diameter end of a flexible pipe joint whose small-diameter end is fitted externally to a connecting pipe and whose large-diameter end is internally fitted to the inner diameter of a connecting pipe mounting hole of a manhole is attached to the inner surface of the connecting pipe mounting hole of the manhole. A steel flat plate ring to be crimped, wherein the ring is formed as a ring smaller than the circumference to be crimped, and an expandable cut portion is provided on the circumference of the ring so that the diameter can be increased. At the same time, a circumferential extension member is attached to the outer periphery of the ring by straddling, means for expanding the ring are attached to both sides of the cut portion of the inner periphery of the ring , and one end of the peripheral extension member is fixed to the outer periphery of the ring.
Locking claw that presses against the opposite end of the cut section
Locking ring manhole for flexible pipe joint, characterized in that the formation of the. 2. A locking ring manhole for flexible pipe joint according to claim 1, characterized by providing a plurality of said opposing end or and locking claws. 3. The wedge bearing, wherein the means for expanding the diameter of the ring is a Z-shaped wedge receiver which is provided opposite to the inner diameter of the ring on both sides of the cut portion and has a taper in the direction of the ring axis. Locking ring for flexible pipe joints for manholes. 4. A wedge-shaped expansion piece that engages with the taper of the Z-shaped wedge receiver to push out the taper, a reaction beam provided with the expansion piece advancing means at the center, and two ends of the reaction beam. An attachment device for a flexible joint for manholes, comprising: two reaction force claws attached to a side surface of a ring. 5. The apparatus according to claim 4 , wherein the extension piece advancing means is a screw device. 6. The manhole according to claim 1, wherein the means for expanding the diameter of the ring is a protrusion having a rectangular cross section parallel to the ring axis direction, provided on the inner diameter of the ring on both sides of the cut portion. Locking ring for flexible fittings. 7. A pair of expansion pieces which are engaged with the projections having a rectangular cross section according to claim 6 to expand the interval between the projections to expand the diameter of the ring, and a pin connection between the bases of the pair of expansion pieces. And a clevis for holding the expansion piece openably, a moving means for moving the clevis in the radial direction, and a stabilizing seat for receiving a reaction force of the moving means on the pipe. Mounting device for flexible fittings. Wherein said moving means is attached devices manhole for flexible pipe joint according to claim 7, characterized in that the turnbuckle.