JP2003160945A - Flexible coupling for manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible coupling, with which a work of modifying the connection between an existing manhole and a pipe into an earthquake resistant structure can be completed inside the manhole. <P>SOLUTION: The flexible coupling (a) is fitted into the gap between a drilled hole and the end of the pipe from the inside of the manhole body. The flexible coupling has tapered surfaces 14, 24, which is the tapered front ends of coupling members 4, 5 fixed to the inside and outside of a sleeve 1 via inside and outside rings 2, 3, respectively. When the tapered surfaces 14, 24 are pressed into the gap, the flexible seals 15, 25 on the tapered surfaces come in slide contact with the interior wall of the drilled hole or exterior wall of the pipe as the seals deform elastically, thus the coupling (a) is ultimately fixed between the interior wall of the drilled hole and the exterior wall of the end of the pipe. Coupled together via the bendable coupling (a), the manhole body and the pipe are held flexible in their move, being able to follow the fluctuation of the ground due to earthquake, differential settlement and the like. Thus, breakage of the pipe on the connection with the manhole can be prevented and the watertightness of the pipe is also maintained. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting pipes such as water and sewage to a manhole drilling hole, and more specifically, to a seismic-resistant structure at the connection between an existing manhole and pipe. A flexible joint for repair.

[0002]

2. Description of the Related Art For the connection between a pipe body and a manhole body, the pipe body is inserted into a hole drilled on the peripheral wall of the manhole in the old days,
Mortar or the like is filled and fixed between the outer peripheral surface of the tubular body and the inner surface of the drilled hole. However, if the connection between the manhole and the pipe was fixed with mortar, etc., it could not follow the earthquake or uneven settlement of the ground, and the pipe was damaged at the connection,
A situation such as breakage occurs.

Therefore, after the Great Hanshin Earthquake, the above-mentioned connection structure has undergone a seismic retrofitting work. Of course, for the newly installed pipeline, a seismic resistant joint structure is used to connect the manhole main body and the tubular body to each other so that their connecting portions have flexibility.

[0004]

However, when the existing pipe line connecting the manhole body and the pipe body with mortar or the like is to be retrofitted with a seismic structure, the manhole body and the pipe body portion connected to the manhole body should be replaced with new ones. If you want to replace it with a new one, install a rubber joint in the factory at the drilling hole of the manhole body in advance, carry it into the field, insert the tube into the rubber joint, and tighten the rubber joint from the outside with a tightening band. Means such as tightening and fixing are taken. However, in the connection work described above, the manhole body and the pipe body connected to the manhole body are replaced with new ones. Therefore, a wide area where the pipeline is buried must be dug up, and the connection work must be performed outside the manhole and pipe body. Since the excavation is performed in the above-mentioned manner, a work space must be secured for the excavation, resulting in a large-scale construction and a problem that the repair work cost increases. In order to eliminate such inconvenience, the mortar between the drilled hole of the manhole body and the pipe end inserted into the drilled hole is shaved to form a donut-shaped gap, and a resin or the like is formed in the gap. However, there is a problem that the filling work of the resin is difficult when the construction site is a water place, and that the filled resin does not provide sufficient elasticity and the earthquake resistance is insufficient. It was

The present invention has been made in view of the above-mentioned problems of the prior art, and the purpose thereof is to:
An object of the present invention is to provide a flexible joint that can complete the work of repairing the connection between the existing manhole and the pipe body into a seismic resistant structure inside the manhole and can obtain a sufficient seismic effect after the work is completed.

[0006]

In order to achieve the above object, the present invention is directed to the inside of the manhole body with respect to the gap between the drilled hole of the manhole body and the end of the pipe body inserted into the drilled hole. A flexible joint that is loaded from to connect the tubular body to a drilled hole, the inner and outer peripheral surfaces of a sleeve having an outer diameter that can be inserted between the drilled inner wall and the outer wall of the tubular body end portion, A plurality of ring reinforcements are fixed at predetermined intervals in the axial direction of the sleeve, and a plurality of inner and outer joint members are arranged by engaging with each ring reinforcement, and the joint members are provided on the inner and outer peripheral surfaces of the sleeve. A ring streak is fitted into a recess provided on the inner or outer circumference of the annular rubber along which the front and rear annular rubbers are connected to each other by the concave and convex engaging means provided on the front and rear ends to be fixed to the sleeve peripheral surface. The taper shape where the front end side of the rubber is tapered It is possible to insert from the inside of the manhole body into the interspace, and it is also possible to press the inner wall or outer wall while elastically deforming the inner or outer circumference of the annular rubber that slidably contacts the inner wall of the drilled hole or the outer wall of the pipe body in the gap. It is characterized by having a flexible seal portion.

Here, the sleeve having an outer diameter that can be inserted between the inner wall of the hole and the outer wall of the end of the pipe body is the same as that of the peripheral wall of the sleeve and the inner wall of the hole and the outer wall of the end of the pipe body. It is preferable that the outer diameter is such that a certain degree of gap is formed. The sleeve may be made of metal, hard synthetic resin, or the like, but a metal sleeve is preferable in consideration of welding and fixing ring reinforcement (rebar) to the inner and outer peripheral surfaces of the sleeve. Further, in order to more securely fix the inner and outer joint members that engage with the respective ring muscles, it is preferable to bond the inner and outer joint members to the sleeve with an adhesive or the like. In particular, the inner and outer joint members, which are on the tip side in the insertion direction with respect to the gap between the drilled hole of the manhole body and the end of the pipe body, may be fixed to the sleeve together with an adhesive or the like in order to prevent curling during insertion. .

When the flexible joint is attached to an existing pipe line in which the manhole body and the pipe body are connected by mortar or the like, the mortar and the like are shaved from the inside of the manhole body to form a hole for the manhole body and the hole. A gap is secured between the pipe body and the end of the tubular body, and the flexible joint is loaded into the gap from the inside of the manhole body. In the flexible joint, the joint member fixed to the inner and outer peripheral surfaces of the sleeve via the ring muscle has a taper shape in which the front end side is tapered, and the flexible seal portion of each joint member in the gap portion, Since it comes into sliding contact with the inner wall of the drilled hole or the outer wall of the drilled body while elastically deforming, it is pushed into the gap and is fixedly mounted between the inner wall of the drilled hole and the outer wall of the end of the tubular body. Therefore, the loading operation can be completed inside the manhole. And since the manhole body and the pipe body are connected by the flexible joint, flexibility is maintained,
By following changes in the ground due to earthquakes, uneven ground subsidence, etc., it is possible to prevent damage to the pipe at the connection with the manhole and maintain watertightness. The flexible joint corresponds to various manholes having different peripheral wall thicknesses (drilling lengths) by appropriately selecting the length of the sleeve and the numbers of inner and outer ring reinforcements and inner and outer joint members to be arranged therein. You can

Further, in the flexible joint of the present invention, the sleeve, the inner and outer ring reinforcements, and the inner and outer joint members are formed in a substantially circular ring shape in accordance with the circular inner wall of the hole drilled in the plane peripheral wall of the rectangular manhole. For example, while the connection between the rectangular manhole and the pipe body can be supported, the sleeve, the inner and outer ring reinforcements, and the inner and outer joint members are formed in a curved ring shape in accordance with the curved inner wall of the drilled hole formed in the cylindrical peripheral wall of the circular manhole. By doing so, it is possible to cope with the connection between the circular manhole and the pipe body.

Further, according to the flexible joint of the present invention, the inner joint member is mounted only on the inner peripheral surface of the sleeve, and the outer joint member is not mounted on the outer peripheral surface of the sleeve. By filling with a filling material such as foaming resin or mortar to connect the pipe to the drilled hole, it is possible to handle cases where the gap between the drilled inner wall and the pipe outer wall is smaller than expected. Can be done.

The flexible joint of the present invention can be used not only for retrofitting existing manholes and pipes for earthquake resistance, but also for connecting new manholes and pipes.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the present invention will be described below with reference to the drawings. 1 to 5, a is a flexible joint, b is a manhole body in a circular manhole, and c is
Is a hole formed in the peripheral wall, e is an end of the pipe body d inserted into the hole c, and f is a gap between the inner wall of the hole c and the outer wall of the pipe end e. As shown, the flexible joint a is formed of a sleeve 1, a plurality of inner and outer ring reinforcements 2 and 3, and a plurality of inner and outer joint members 4 and 5.

The sleeve 1 includes an inner wall of the drilled hole c and an end portion e of the tube body.
Is a metal sleeve having an outer diameter that can be inserted into the gap f leaving a similar gap between the inner wall and the outer wall of the inner ring reinforcement 2 and outer ring reinforcement 3 welded to each other. It is fixed by.

The inner ring reinforcements 2 are annular reinforcing bars fixed along the inner peripheral surface of the sleeve 1. In the illustrated example, three inner ring reinforcements 2 are fixed at equal intervals in the axial direction of the sleeve 1. Has been done. The outer ring reinforcements 3 are annular reinforcing bars fixed along the outer peripheral surface of the sleeve 1. In the illustrated example, the three outer ring reinforcements 2 are arranged at equal intervals in the axial direction of the sleeve 1 and on the inner side thereof. They are fixed at positions corresponding to the ring muscles 2, respectively.

The inner joint member 4 is an annular rubber arranged along the inner peripheral surface of the sleeve 1, and each inner ring member 2
The inner ring reinforcement 2 is fitted to the fitting recess 11 provided on the outer periphery of the ring, and the unevenness is formed by the locking projection 12 provided on the front end side and the locking recess 13 provided on the rear end side. It is fixed to the inner peripheral surface of the sleeve 1 in a state where the front and rear inner joint members 4 and 4 are connected by the engaging means. The inner joint member 4 is formed so that the front end side, which is the front side when the flexible joint a is pushed into the gap f, is the tapered surface 14, and can be easily pushed into the gap f. Further, the inner joint member 4 has a flexible seal portion 15 which is elastically deformed and press-contacts with the outer wall at an inner peripheral portion of the gap f that is in sliding contact with the outer wall of the tube end portion e. Sealing part 15
The slit 15a is formed on the inner peripheral portion of the annular rubber, so that the tongue-shaped flexible seal piece 15 is formed in front of and behind the slit 15a.
b and 15b are provided.

The outer joint member 5 is an annular rubber arranged along the outer peripheral surface of the sleeve 1, and each outer ring member 3
The outer ring reinforcement 3 is fitted into the fitting recess 21 provided on the inner periphery, and the engaging projection 22 is provided on the front end side and the engaging recess 23 is provided on the rear end side. The front and rear outer joint members 5, 5 are fixed to the outer peripheral surface of the sleeve 1 by the concave-convex engaging means. Further, the outer joint member 5 is formed so that the front end side, which is the front side when the flexible joint a is pushed into the gap portion f, is a tapered surface 24 and can be easily pushed into the gap portion f. Further, the outer joint member 5 has a flexible seal portion 25, which is elastically deformed and comes into pressure contact with the inner wall, at an outer peripheral portion of the outer peripheral portion of the clearance f which is in sliding contact with the inner wall of the drilled hole c. 25 is a tongue-shaped flexible seal piece 25b, 25 formed in the front and rear of the slit 25a by forming a slit 25a on the outer periphery of the annular rubber.
b is formed.

The sleeve 1 and the inner and outer ring muscles 2,
3. The inner and outer joint members 4, 5 are each formed in a curved annular shape so as to match the curved inner wall of the drilled hole c formed along the cylindrical peripheral wall of the manhole body b in the circular manhole.

When using the flexible joint a of the present example having the above-mentioned structure to perform seismic retrofitting work on the connection portion of an existing pipeline, first, the peripheral wall of the manhole body b in the pipeline to be repaired According to the thickness of the hole, that is, the length of the drilled hole c, and the length of the sleeve 1 and the inner and outer ring streaks 2 and 3 to be arranged therein.
The number of inner and outer joint members 4 and 5 is appropriately selected, and the flexible joint a corresponding to the drilled hole c is prepared in advance. Then, in the field, as shown in FIG. 3, the manhole body b
The mortar g and the like connecting the manhole body b and the tube end portion e are cut from the inside to secure a gap f between the inner wall of the drilled hole c and the outer wall of the tube end portion e. Next, as shown in FIG. 4, the flexible joint a is loaded into the clearance f from the inside of the manhole body b. The flexible joint a can be easily inserted into the clearance f because the joint members 4 and 5 inside and outside the sleeve 1 are tapered with the tapered surfaces 14 and 24 on the front side in the insertion direction. 4, 5 flexible seal parts 1
Flexible seal pieces 15b and 25b in 5 and 25, respectively
Move in the clearance f while elastically deforming and slidingly contacting the inner wall of the drilled hole c and the outer wall of the tube end e, and are pushed into the clearance f to be pushed into the drilled hole c and the tube end e. It is fixedly mounted between the outer wall and the outer wall. After the loading of the flexible joint a is completed, if necessary, as shown in FIG. 5, from the rear end side of the gap portion f (inside the manhole body b), a foaming resin h such as urethane is formed.
And finish the inner surface with urethane resin to complete the work. As a result, the manhole main body b and the pipe body d are water-tightly connected by the flexible joint a in a state where the flexibility is maintained. Following this, it is possible to prevent damage to the tubular body d at the connection portion with the manhole and to maintain watertightness.

FIG. 6 shows a flexible joint a'used for seismic retrofitting of a hole c'opened in a planar peripheral wall of a manhole body b'in a rectangular manhole and a tube body end e.
That is, in the flexible joint a ′ of this example, the sleeve 1, the inner and outer ring stiffeners 2 and 3, and the inner and outer joint members 4 and 5 of the flexible joint a of the above-described embodiment are the holes c ′ and It is formed into a substantially circular ring shape so as to fit the inner wall of the perfect circle.
Further, in this example, the inner and outer ring streaks 2 and 3 are fixed to the front and rear end portions of the sleeve 1 by welding in correspondence with the manhole body b'having a relatively thick peripheral wall and a long hole c '. The case where the inner and outer joint members 4 and 5 are arranged on the ring muscles 2 and 3 is shown. Other configurations, loading work, effects, and the like are the same as those of the above-described embodiment, and thus duplicated illustration and description will be omitted.

Then, also in this flexible joint a ',
Similar to the flexible joint a of the above-described embodiment, the manhole body b ′ and the pipe body d are water-tight in a state where the manhole body b ′ and the pipe body d are kept flexible by loading from the inside of the rectangular manhole into the gap f. Can be connected in a shape.

In this example, when the drilled hole c'is short, the inner and outer ring surfaces of the sleeve 1 prepared in accordance with the length of the hole c'are set to have inner and outer ring streaks 2 and 3 at regular intervals. The inner and outer joint members 4 and 5 may be arranged. Further, when the drilling hole c is long in the above-mentioned example, the inner and outer peripheral surfaces of the sleeve 1 prepared according to the length thereof are arranged in front and rear. The inner and outer ring reinforcements 2 and 3 may be fixed to both ends by welding, and the inner and outer joint members 4 and 5 may be arranged on the ring reinforcements 2 and 3.

FIG. 7 shows the above-mentioned flexible joint a or a '.
2 shows an embodiment in which the outer joint member 5 is not attached to the outer peripheral surface of the sleeve 1 and the inner joint member 4 is attached only to the inner peripheral surface of the sleeve 1. That is, the flexible joint a ″ of this example
After assembling the above-described flexible joint a or a ′ and carrying it to the site, the outer diameter of the gap f between the drilled hole c or c ′ and the pipe end e is smaller than expected, and the outer joint When the insertion dimension of the member 5 cannot be secured, each outer joint member 5 is attached to the sleeve 1
A flexible member a ″ is formed by removing the outer peripheral surface from the inner peripheral surface of the sleeve 1 and attaching each inner joint member 4 to the flexible member a ″. 1 A foaming resin such as urethane or a filling material j such as mortar is filled between the outer peripheral surface and the inner wall of the drilled holes c or c'to connect the tubular body d to the drilled holes c, c '. . Other configurations, loading work, effects, and the like are the same as those of the above-described embodiment, and thus duplicated illustration and description will be omitted. Also in this flexible joint a ″, similarly to the flexible joint a or a ′ of the above-described embodiment, the operation is performed from the inside of the rectangular manhole to load it into the gap f and to form the manhole body b or b ′. Tube d
It goes without saying that they can be connected in a watertight manner while the flexibility is maintained.

Although the example of the embodiment of the flexible joint according to the present invention has been described with reference to the drawings, the present invention is not limited to the illustrated examples, and the techniques described in the scope of the claims. It goes without saying that various changes can be made within the scope of the intellectual thought.

[0024]

Since the flexible joint of the present invention is constructed as described above, the flexibility is maintained by loading the manipulator from the inside of the manhole into the gap between the manhole body and the end of the pipe body. The manhole and the pipeline can be connected in a watertight manner in the closed state. Therefore, when repairing the connection between the manhole body and the pipe body in the existing pipeline to an earthquake-resistant structure, it is possible to perform the construction without excavating the soil, etc.
In addition, even if the site is a water site, it is possible to easily perform the work, and it is possible to ensure the earthquake resistance while reducing the construction period and the construction cost. Further, since the inner and outer joint members are arranged on the inner and outer peripheral surfaces of the sleeve via the ring streak, it is possible to determine whether the manhole body has a perfect circular shape or a curved shape due to the difference between the circular shape and the rectangular shape, The size of the hole,
Depending on the conditions such as the length and the size of the gap, which vary depending on the site where the pipeline is buried, the sleeves, inner and outer ring reinforcements, the true circular shape of the inner and outer joint members, the curved annular shape, and the sleeve length,
A flexible joint having various configurations can be manufactured by appropriately selecting the number and locations of the respective ring muscles and joint members. Therefore, there are many effects such as being able to deal with various conditions that differ for each pipeline burying site.

[Brief description of drawings]

FIG. 1A is a perspective view showing an example of an embodiment of a flexible joint according to the present invention, in which a part is cut away, and FIG. 1B is an enlarged sectional view of a main part thereof.

FIG. 2 is a plan sectional view showing a usage state of the flexible joint shown in FIG. 1 in a circular manhole.

FIG. 3 is a cross-sectional view showing an example of a mortar cut state before the flexible joint shown in FIG. 1 is attached to an existing circular manhole.

FIG. 4 is an enlarged sectional view of an essential part showing a state in which the flexible joint shown in FIG. 1 is being attached to an existing circular manhole.

5 is an enlarged cross-sectional view of an essential part showing a state after mounting the flexible joint shown in FIG. 1 on an existing circular manhole.

FIG. 6 is a cross-sectional view showing a state after mounting a flexible joint mounted on a rectangular manhole.

FIG. 7 is an enlarged sectional view of an essential part showing a state after mounting the flexible joint with the outer joint member removed.

[Explanation of symbols]

a, a ', a ": flexible joint 1: Sleeve 2: Inner ring muscle 3: Outer ring muscle 4: Inner joint member 5: Outer joint member 11,21: Mating recess 12,22: Locking protrusion 13,23: Locking recess 14,24: Tapered surface 15,25: Flexible seal part 15b, 25b: Flexible seal pieces b, b ': Manhole body c, c ': drilling d: tube e: Tube end f: gap j: Filler

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16L 41/08 F16L 41/02 Z

Claims (4)

[Claims] 1. A flexible body which is loaded from the inside of the manhole body into a gap between the drilled hole of the manhole body and the end of the pipe body inserted into the drilled hole to connect the pipe body to the drilled hole. A plurality of ring streaks are formed on the inner and outer peripheral surface of the sleeve having an outer diameter that can be inserted between the hole inner wall and the outer wall of the tubular body end at predetermined intervals in the axial direction of the sleeve. Along with fixing, a plurality of inner and outer joint members are provided by engaging with each ring muscle, and the joint member has a ring muscle in a recess provided on the inner or outer circumference of the annular rubber along the inner and outer peripheral surfaces of the sleeve. In addition to fitting, the concave and convex engaging means provided at the front and rear ends connect the front and rear annular rubbers to each other and are fixed to the sleeve peripheral surface, and the front end side of the annular rubber is tapered so that the manhole is formed in the gap. Allows insertion from inside the body,
Further, a flexible seal portion for elastically deforming and press-contacting the inner wall or the outer wall is provided on the inner or outer circumference of the annular rubber slidably contacting the inner wall of the drilled hole or the outer wall of the tubular body in the clearance. Flexible joint. 2. The sleeve, the inner and outer ring reinforcements, and the inner and outer joint members are formed in a substantially circular ring shape in conformity with the circular inner wall of the drilled hole formed in the planar peripheral wall of the rectangular manhole. The flexible joint for a manhole according to claim 1. 3. The sleeve, the inner and outer ring reinforcements, and the inner and outer joint members are formed in a curved annular shape so as to match the curved inner wall of the hole drilled in the cylindrical peripheral wall of the circular manhole. The flexible joint for a manhole according to 1. 4. The inner joint member is mounted only on the inner peripheral surface of the sleeve, the outer joint member is not mounted on the outer peripheral surface of the sleeve, and a foaming resin or mortar is filled between the outer peripheral surface of the sleeve and the inner wall of the drilled hole. The flexible joint for a manhole according to any one of claims 1 to 3, wherein the flexible joint is filled with a material to connect the tubular body to the drilled hole.