JP2003278174A - Fixing method of flexible joint, expansion band and connecting structure of manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide further high close fitting property between a flexible joint and a manhole hole part. <P>SOLUTION: This fixing method of flexible joint for fixing a flexible joint to the hole part of a manhole comprises (1) a process for preparing the flexible joint, the flexible joint having a manhole-side cylindrical part to be fixed to the hole part; (2) a process for preparing an expansion band 1, the expansion band 1 having an annular member 2 having a cut part 3 at least in one position and a rigid collar 4 for housing both end parts 3a and 3b of the cut part 3 in a slidable state; (3) a process for arranging the expansion band 1 on the inside of the manhole-side cylindrical part of the flexible joint; (4) a process for sliding both the end parts 3a and 3b of the cut part 3 within the rigid collar 4 to extend the diameter of the annular member 2; and (5) a process for fixing both the end parts 3a and 3b of the cut part 3 to fix the annular member 2 in the diameter-extended state, and fixing the manhole-side cylindrical part to the hole part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a flexible joint to a drilled portion of a manhole, an expansion band used in such a method, and a connection structure for a manhole obtained by using the expansion band.

[0002]

2. Description of the Related Art A manhole used for sewage pipe surface maintenance, where the direction and slope of a sewer pipe change, or where the pipe diameter changes, is made by placing concrete at the connection between the manhole and the main pipe. The method of winding up was used. However, if the relative positions of the main pipe and manhole are displaced due to ground deformation such as ground subsidence or an earthquake, the concrete lining part may crack or be pulled out of the manhole.
There was a drawback that unknown water invaded and sewage leaked.

In recent years, rubber flexible joints have been widely used, which can absorb the displacement even if the relative positions of the manhole and the main pipe are displaced, and can maintain the waterproof property. 7 and 8 are a longitudinal sectional view and a partial longitudinal sectional view showing an attached state and an expansion band of a conventional flexible joint.

[0004]

As shown in FIG. 7, when a displacement of the pipe 103 from the manhole 102 such as B occurs while the pipe 103 is connected to the manhole 102 at a mounting angle θ, it is flexible. The joint 104 is locally pulled, and the shearing force is locally applied to the portion A of the expansion band 105.

An extension band 105 having a cutting portion 107 as shown in FIG. 8 is generally used, and the extension jig 1
The cutting part 107 is expanded by using 06 or the like, and the wedge piece 108 is inserted into the cutting part 107 as shown in FIG. 8 or the both ends of the expansion band of the cutting part are provided with a claw or a locking part to expand the diameter. A method is used in which the claw is fitted into the locking portion and fixed.

[0006] However, when the pipe comes out at the attachment angle θ and a displacement occurs, a shearing force acts on the expansion band, and when stress is concentrated on one side of the cut portion of the expansion band, stress is applied to the expansion band. The twisting occurs, the locking part comes off, and the expansion band falls off.

The above-mentioned phenomenon is apt to occur due to ground subsidence, an earthquake, etc., but there is a demand for a method in which the expansion band does not fall off even if a shearing force is locally applied to the expansion band.

An object of the present invention is to obtain even higher adhesion between the flexible joint and the manhole drilling portion.

[0009]

According to the present invention, in fixing a flexible joint to a drilled portion of a manhole, (1) a step of preparing a flexible joint, wherein the flexible joint is the drilled portion A step of having a manhole-side tubular portion fixed to the, and (2) a step of preparing an expansion band, wherein the expansion band has an annular member having a cut portion at at least one location, and the cut portion. And (3) arranging the expansion band inside the manhole-side tubular portion of the flexible joint, (4) the cutting. Sliding both ends of the ring member in the rigid collar to expand the annular member,
And (5) fixing both ends of the cut portion, fixing the annular member in an expanded state, and fixing the manhole-side tubular portion to the drilled portion, fixing the flexible joint. It relates to the method.

Further, the present invention is an expansion band used for expanding a flexible joint and fixing it to a drilled portion of a manhole, wherein the expansion band has an annular member having at least one cut portion, A rigid collar accommodating both ends of the cut portion in a slidable state, and when the expansion band is expanded, the sliding of both ends of the cut portion within the rigid collar and the The present invention relates to an expansion band in which the annular member is fixed in an expanded diameter state by fixing both ends of the cut portion.

Furthermore, the present invention provides a manhole connection structure in which a drilled portion of a manhole and a pipe are connected by a flexible joint, wherein the flexible joint is fixed to the drilled portion. An annular member having a cutting portion at least at one location, the manhole-side tubular portion being expanded in diameter by an expansion band and being fixed to the drilled portion, A rigid collar accommodating both ends of the cutting part, and the annular member is fixed in an expanded state by sliding the both ends of the cutting part in the rigid collar and fixing the both ends of the cutting part. The present invention relates to a manhole connection structure characterized in that

The present inventor has found that when a pipe having a mounting angle is attached to the drilled portion of the manhole, the adhesion between the drilled portion of the manhole and the flexible joint is not sufficient.

Even if the flexible joint is attached to the drilled portion of the manhole, and then the pipe mounting port of the flexible joint is bent in accordance with the mounting angle of the pipe, the flexible joint is provided between the drilled portion of the manhole and the flexible joint. A part with poor water tightness occurs.

According to the research conducted by the present inventor, it has been found that the cause of this is an expansion band used for fixing the flexible joint to the drilled portion of the manhole.

That is, for a band for fixing a flexible joint to a connection hole of a manhole, generally, a ring-shaped rigid band is cut at one place, and a cutting portion is opened and fixed by an expansion jig. Since the expansion force acts in the horizontal direction, the end of the expansion band near the cutting part is less likely to receive compressive stress on the connection hole surface, and the expansion band is expanded and fixed with the circumference of the expansion band disconnected at the end. The flexible joint only adheres insufficiently to the surface of the manhole connection hole.

Based on such knowledge, the present inventor examined various means for fixing the flexible joint to the manhole drilling portion with high adhesion.

As a result, the present inventor accommodated the cut ends of the expansion band in a rigid collar and slidable within the collar so that the lack of a circumferential line between the cut ends caused the collar to fall. The present invention has been accomplished by finding that the expansion band is expanded to a state of a nearly perfect circle by being supplemented by the outer circumference of the above, and the flexible joint can be fixed to the drilled portion of the manhole with high adhesion.

In the present invention, the extension band is at least one.
An annular member having a cut portion at a position and a rigid collar that accommodates both ends of the cut portion in a slidable state are provided.

The ring means a ring-like shape,
Includes rings, spirals, etc. The shape of the annular member according to the present invention is such that the manhole-side tubular portion of the flexible joint can be fixed to the drilled portion of the manhole with good adhesion.

The rigid collar according to the present invention accommodates both ends of the cut portion of the annular member in a slidable state. When the diameter of the annular member is expanded by an expansion jig or the like, both ends of the cutting portion move in the rigid collar, and the space between both ends opens. Both ends of the cut portion opened by the expansion of the annular member are fixed by appropriate means.

According to the present invention, since a predetermined annular member is simply expanded in diameter with an expansion jig or the like, expansion work is easy as in the conventional case. Further, according to the present invention, both ends of the cut portion of the annular member can be moved along the circumferential line of the expansion band within the rigid collar to expand the diameter of the annular member, thereby covering the cut portion of the annular member. Since the rigid collar compensates for the missing portion on the outer periphery of the annular member, it is possible to obtain a substantially uniform crimping force to the manhole drilling portion even near the cut portion of the annular member.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described. (1) Manhole The present invention can be sufficiently applied to various manholes, for example, a small manhole, a normal No. 1 manhole, a manhole having a size larger than those, or a manhole made of various materials. .

(1-1) Drilling Portion The manhole according to the present invention is provided with a drilling portion for connecting pipes. The size and shape of the hole of the drilled portion,
The forming means and the like are not particularly limited. The flexible joint according to the present invention is fixed to the drilled portion of the manhole.

(2) Pipe The present invention can be applied to connecting various pipes to manholes. The tube is not particularly limited, and tubes having various diameters, materials, shapes, etc. can be used.

(2) Flexible Joint The flexible joint according to the present invention has a manhole-side tubular portion fixed to the drilled portion of the manhole. In the present invention, the tubular shape means a shape having an outer peripheral portion and an internal space surrounded by the outer peripheral portion. The internal space may have a cross-sectional shape such as a circle, a triangle, a polygon such as a quadrangle, or a shape that can be variously deformed. A cylinder includes a cylinder.

The flexible joint may be various conventionally used joints and may be formed of various materials. Examples of such a material include at least one material selected from the group consisting of elastic materials such as natural rubber, synthetic rubber, soft plastic, and thermoplastic elastomer.

(3) Expansion Band The expansion band of the present invention is used for expanding the flexible joint and fixing it to the drilled portion of the manhole. The expansion band includes an annular member having a cut portion at at least one location, and a rigid collar that accommodates the cut portion in a slidable state.

(4) Annular member The annular member according to the present invention has a cut portion at at least one position. The annular member forms the main body of the expansion band and exhibits the original function of the expansion band.

Both ends of the cut portion of the annular member slide in the rigid collar when the expansion band is expanded. Further, the annular member is fixed in an expanded state by fixing both ends of the cut portion of the annular member.

(4-1) Expansion of Annular Member In the present invention, the annular member can be expanded using an expansion device such as a jack and various expansion means without any particular limitation.

(4-2) Fixing of the annular member Both ends of the cut portion of the annular member opened by expansion can be fixed so as to maintain the expanded state by suitable means without particular limitation.

Suitable fixing means are, for example, fixing portions such as projections such as claws provided on the annular member, locking portions provided on the rigid collar, fixing portions and stoppers for fixing tools provided on the annular member, and the like. The combination with various fixing tools can be mentioned.

Fixing portions are provided at both ends of the cut portion of the annular member, locking portions for engaging with the fixing portions are provided in the rigid collar, and the annular member is expanded by the engagement of the fixing portions and the engaging portions. Can be fixed in the state.

Further, fastening parts for fasteners are provided at both ends of the cut portion of the annular member, windows for inserting the fixtures are provided in the rigid collar, and the fixtures are provided between the windows and the fastening parts for fixtures. By inserting, the annular member can be fixed in the expanded state.

The fixing means can be formed of the above-mentioned hard resin, plastic, metal which is hard to corrode, or the like.

The fixing member for the annular member, the projections such as the claws provided on the annular member, and the fixing member for the fixture according to the present invention are made of hard vinyl chloride resin, ABS resin [acrylonitrile, butadiene, and styrene (tertiary). Copolymer resin], PET (polyethylene terephthalate) resin, etc., nylon, etc., and at least one material selected from the group consisting of various plastics, or rustproof steel, stainless steel, etc. It can be formed from at least one material selected from the group consisting of difficult metals and the like.

(5) Rigid Collar The rigid collar according to the present invention, when the expansion band is expanded,
Allows sliding of the cutting portion of the annular member within the rigid collar.

Further, such a rigid collar can serve to fix the annular member in the expanded state by providing the engaging portion for fixing the end of the cut portion of the annular member.

As described above, the rigid collar according to the present invention enables movement of the cut end portion due to the expansion of the annular member inside thereof, while the outer periphery of the rigid collar is substantially uniform in the circumferential direction of the expansion band. Allows for expansion.

The rigid collar according to the present invention and the locking portion provided on the rigid collar can be formed of the above-mentioned resin, nylon, plastic, or metal which is not easily corroded.

(6) Manhole Connection Structure In the manhole connection structure of the present invention, when connecting the manhole drilling portion and the pipe by a flexible joint, the expansion joint described above is used to connect the flexible joint to the manhole drilling portion. It can be installed by fixing to.

In such a manhole connection structure, the manhole-side tubular portion of the flexible joint is expanded by the expansion band and fixed to the drilled portion of the manhole.

The flexible joint can be connected to the pipe by fixing the tubular portion of the flexible joint to the pipe as usual.

In the manhole connection structure of the present invention, the expansion band is fixed in an expanded state by sliding and fixing the cut portion of the annular member within the rigid collar, and the manhole-side tubular portion of the flexible joint is the manhole. It has extremely high watertightness because it is expanded almost uniformly in the direction of the drilled part.

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view showing an expansion band according to an example of the present invention. FIG. 2 is a front view of the extension band of FIG.
FIG. 3 is a front view showing a state in which the expansion band of FIG. 2 is expanded by an expansion device. FIG. 4 is a front view showing an expansion band of another example of the present invention. FIG. 5 is a perspective view showing an expansion band of still another example of the present invention. FIG. 6 is a vertical cross-sectional view of the manhole structure of one example of the present invention.

In the present invention, when the flexible joint is expanded and fixed to the manhole connection hole with a rigid band, the structure shown in FIGS.
The extension band shown in can be used.

FIG. 1 shows an example extension band 1 of the present invention. In FIG. 1, the expansion band 1 is shown enlarged. The cut portion 3 of the annular member 2 has both end portions 3a and 3b.
Both are in the central portion of the rigid collar 4, and the band locking claws 5a, 5b of the annular member 2 and the collar locking claw 6a of the rigid collar 4,
6b are engaged in the rigid collar 4. FIG. 2 is a front view of the expansion band 1 of FIG. 1, and shows the entire expansion band 1.

FIG. 3 shows a case where the expansion band 1 of FIG. 2 is expanded by an expansion device. A bearing pedestal 8 is provided on one side of the jack 7, and a jack pedestal 10 connected to an extension jig 9 is provided on the other side. The bearing pedestal 8 is applied to the extension band 1, and the extension locking portions 11 and 12 of the extension jig 9 are locked to the extension support portions 13 and 14 of the extension band 1.

By jacking up the jack 7, the space between the expansion locking portions 11 and 12 is expanded, and the expansion band 1
Is expanded and expanded, and the band locking claws 5a and 5b and the collar locking claws 6a and 6b are engaged with each other, and the expansion band 1
Is fixed in the expanded state.

As shown in FIGS. 1 to 3, the annular member 2 of the expansion band 1 is provided with a cut portion 3, and both end portions 3 a and 3 b of the cut portion 3 are located inside the both ends of the rigid collar 4. Has been inserted into.

When the expansion band 1 is expanded by the jack 7 and the expansion jig 9 as shown in FIG. 3, both ends 3a and 3b of the annular member 2 are connected by the rigid collar 4 as shown in detail in FIG. In this state, it moves along the space in the rigid collar 4 and widens the space.

As described above, the expansion band 1 can be expanded in a state where the circumferential line of the expansion band is secured, and uniform compressive stress can be obtained to the connection hole, so that the expansion band 1 can be formed as a manhole hole. It is possible to obtain excellent water tightness with the flexible joint.

In the present invention, as shown in detail in FIG. 1, the band locking claws 5a, 5a, are formed near the both ends 3a, 3b of the annular member 2.
A fixing part such as 5b is provided, locking parts such as collar locking claws 6a and 6b are provided in the rigid collar 4, and the annular member 2 is easily expanded and fixed by engaging both at the time of expansion. You can

FIG. 4 shows an extension band 21 according to another example of the present invention.
Shows the state of expansion at the two cutting portions 23a and 23b.

As described above, when the cutouts 23a and 23b are provided at the two places on the expansion band 21 using the rigid collar 24, the expansion jigs 29a and 29b are attached to the cutouts 23a and 23b, respectively, and the jack 27 simultaneously cuts the cutouts 23a and 23b. Can be expanded and both ends of the annular member 22 can be fixed in the rigid collar 24.

An expansion band having two or more cut portions is useful when fixing a flexible joint to a manhole having a large drilling diameter. This is because if the connection hole of the manhole is large, the circumference of the expansion band becomes long, and it becomes difficult to uniformly expand the entire circumference of the expansion band at one cut portion.

In FIG. 4, the annular member 22, the rigid collar 24, the jack 27, the expansion jigs 29a and 29b,
The jack pedestals 30a, 30b, band locking claws 25a, 25b, collar locking claws, expansion locking parts, expansion supporting parts, etc., which are not shown in an enlarged view, are the same as those in FIGS.

FIG. 5 shows an extension band 4 according to still another example of the present invention.
The rigid collar 44 has a window 55 on the inner peripheral side of the central portion. From the window 55, the cut portion 43 of the annular member 42 can be seen in the central portion of the rigid collar 44. Stoppers 45a, 4 are provided on both ends 43a, 43b of the cutting portion 43.
5b are provided at opposite positions.

In the expansion band 41 of this example, the space between the expansion support portions 53 and 54 is expanded to form stopper stopper portions 45a and 45.
When the distance between b is expanded, the stopper 46 can be inserted between them through the window 55 and the expansion band 41 can be fixed in the expanded state. As a result, the same effect as that of the extension band described above can be obtained.

FIG. 6 shows a manhole connection structure 61 according to an example of the present invention, in which a drilled portion 62a of a manhole 62 and a pipe 63 are connected by a flexible joint 64. The flexible joint 64 has a manhole side tubular portion 65 fixed to the drilled portion 62a, and the manhole side tubular portion 65 is expanded by the expansion band 1 and fixed to the drilled portion 62a.

As shown in FIG. 1, the expansion band 1 is provided with an annular member 2 having a cut portion 3 at at least one place, and a rigid collar 4 accommodating both end portions 3a and 3b of the cut portion 3. . The annular member 2 has a cutting portion 3 in the rigid collar 4.
Of both ends 3a, 3b of sliding member 3 and both ends 3 of cutting portion 3
It is fixed in an expanded state by fixing a and 3b.

In FIG. 6, the pipe 63 is attached to the drilled portion 62a of the manhole 62 at the attachment angle θ. Flexible joint 64
Even if the tube side tubular portion 66 of is bent in the attachment angle θ direction of the tube 63,
Since the manhole-side tubular portion 65 is fixed to the drilled portion 62a of the manhole 62 with high adhesion by the expansion band 1, there is no problem of water leakage or intrusion of unknown water in the manhole connection structure.

[0063]

According to the present invention, since a predetermined annular member is simply expanded in diameter with an expansion jig or the like, expansion work is easy as in the conventional case.

Further, according to the present invention, both ends of the cut portion of the annular member can be moved along the circumferential line of the expansion band in the rigid collar to expand the diameter of the annular member. Since the rigid collar covering the portion compensates for the missing portion on the outer periphery of the annular member, it is possible to obtain a substantially uniform pressure-bonding force to the manhole drilling portion even near the cut portion of the annular member.

[Brief description of drawings]

FIG. 1 is a perspective view showing an expansion band according to an example of the present invention.

2 is a front view of the extension band of FIG. 1. FIG.

FIG. 3 is a front view showing a state in which the expansion band in FIG. 2 is expanded by an expansion device.

FIG. 4 is a front view showing an expansion band according to another example of the present invention.

FIG. 5 is a perspective view showing an expansion band according to still another example of the present invention.

FIG. 6 is a vertical cross-sectional view of a manhole structure according to an example of the present invention.

FIG. 7 is a vertical cross-sectional view showing a mounted state of a conventional flexible joint.

FIG. 8 is a partial vertical sectional view showing an expansion band of a conventional flexible joint.

[Explanation of symbols] 1,21,41 expansion band 2,22,42 Ring member 3,23,43 Cutting part 3a, 3b, 43a, 43b Both ends 4,24,44 Rigid collar 5a, 5b Band locking claw 6a, 6b Color locking claw 7 jacks 8 bearing pedestal 9 Expansion jig 10 jack pedestal 11,12 Extended locking part 13, 14, 53, 54 Expansion support 45a, 45b Stopper stopper 46 Stopper 55 windows 61 Manhole connection structure 62 manhole 62a Drilling part 63 tubes 64 Flexible joint 65 Manhole side tubular part 66 Tube side tubular part

Continued front page    (72) Inventor Satoshi Suyama             Hayakawago, 5351 Minamioka, Minooshima-cho, Fukuyama City, Hiroshima Prefecture             Mu Co., Ltd. F-term (reference) 2D047 BA27

Claims (5)

[Claims] 1. A method of fixing a flexible joint to a drilled portion of a manhole, comprising: (1) preparing a flexible joint, wherein the flexible joint is fixed to the drilled portion. And (2) a step of preparing an expansion band, wherein the expansion band is capable of sliding an annular member having a cut portion at at least one location and both ends of the cut portion. And (3) arranging the expansion band inside the manhole-side tubular portion of the flexible joint, (4) both ends of the cut portion are the rigid collar. Sliding the inside to expand the diameter of the annular member, and (5) fixing both ends of the cutting portion to fix the annular member in the expanded state, and the manhole-side tubular portion to the drilled portion. It is characterized by including a step of fixing Fixing method of the joint. 2. An expansion band used for expanding a flexible joint and fixing it to a drilled portion of a manhole, wherein the expansion band includes an annular member having a cut portion at at least one position, and the cut portion. A rigid collar that accommodates both ends in a slidable state, and when expanding the expansion band, slides both ends of the cut portion within the rigid collar and both ends of the cut portion. An expansion band characterized in that the annular member is fixed in an expanded state by fixing the portion. 3. A fixing part is provided at each of both ends of the cutting part, and a locking part for engaging with the fixing part is provided in the rigid collar, and the fixing part and the locking part are provided. The expansion band according to claim 2, wherein the annular member is fixed in a radially expanded state by engagement with a portion. 4. A fastener retaining portion is provided at each of both ends of the cutting portion, and the rigid collar has windows, and the fixing collar retaining portion has a window between the fastener retaining portions. The expansion band according to claim 2, wherein the annular member is fixed in a diameter-expanded state by inserting the fixing tool. 5. A manhole connection structure in which a drilled portion of a manhole and a pipe are connected by a flexible joint, wherein the flexible joint has a manhole-side tubular portion fixed to the drilled portion. The manhole-side tubular portion is expanded in diameter by an expansion band and is fixed to the drilled portion, and the expansion band has an annular member having a cut portion at least at one location, and both end portions of the cut portion. A rigid collar that holds the annular member, and the annular member is fixed in an expanded state by sliding of both ends of the cutting portion and fixing of both ends of the cutting portion within the rigid collar. Connection structure for manholes.