JPH11166244A - Joint construction, expansion fixed band and positioning device of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide joint construction capable of mounting a flexible joint on an excavated hole surface in a manhole at an optical compressive quantity. SOLUTION: Joint construction having an excavated hole surface 3 and a flexible joint 4 and mounting the flexible joint 4 on the excavated hole surface 3 is provided. The joint construction is so constituted that it is equipped with an excavated hole adherence section 4a closely adhering the flexible joint 4 to the excavated hole surface 3, a rigid expansion fixed band 5 is provided on the inside of the excavated hole adherence section 4a, clamping devices 8 and 9 and a guide groove 7 are provided on the expansion fixed band 5, the guide groove 7 is provided along the longitudinal direction of the expansion fixed band 5, the clamping devices 8 and 9 are made to pass through the guide groove 7, the expansion fixed band 5 is expanded and that the clampling devices 8 and 9 are clamped. By the constitution, the excavated hole adherence section 4a is expanded and pushed to the excavated hole surface 3 from the inside of the excavated hole adherence section 4a and is closely adhered to the excavated hole surface 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for connecting a sewer pipe or the like to a borehole of a manhole, an extension fixing band used for the joint structure, and a pipe positioning for positioning the sewer pipe or the like with respect to the borehole of the manhole. Related to the device.

[0002]

2. Description of the Related Art FIG. 10 is a longitudinal sectional view of a conventional manhole structure. As shown in FIG. 10, the connection part 70 between the manhole 1 and the sewer pipe 2 has conventionally been mainly made of a concrete roll 60 that fills the connection part 70 with mortar or concrete and stops water. In this concrete roll 60, there is a disadvantage that curing time is required until the concrete hardens at the time of construction, and cracks are generated due to uneven settlement or earthquake after the construction, and water leakage or unknown water intrusion is likely to occur. .

[0003] A watertight joint made of flexible rubber or soft plastic has been proposed for this concrete winding method. This flexible joint can follow the displacement even when the relative positional relationship between the manhole and the pipe is displaced due to displacement of the ground or the like. FIG. 9A is a rear view of such a water stop flexible joint. FIG. 9B is a longitudinal sectional view of such a water stop flexible joint. FIG. 9A shows a step of attaching the water stop flexible joint 54 to the drilled surface 3 of the manhole 1 as viewed from the inside of the manhole 1. FIG.
(B) is a water stop flexible joint 5 attached to the manhole 1.
4 is cut in the length direction. As shown in FIGS. 9 (a) and 9 (b), the water stop flexible joint 54 uses an expansion ring 56 of a certain length and a special jack 57 to
By always expanding the expansion ring to the same length, it is mechanically attached to the drilled surface 3 of the manhole 1.

After the flexible joint is attached to the manhole, a sewer pipe is inserted into the flexible joint and fixed.
In order to make the sewage flow smoothly, it is necessary to adjust the pipe position. In order to determine the position of the pipe, as shown in FIG.
And the position of the tube is adjusted.

[0005]

In the above-described method of attaching a flexible joint to a manhole drilling surface as described above, the jigs for drilling the manhole have variations in the diameter of the forsaw and wear of the forsaw blade. The variation of the drilling diameter and the variation of the drilling diameter due to the difference in the drilling method occur. For this reason, if the drilling diameter is larger than the design if the expansion ring is always fixed at the same expansion length, the set compression amount will not be reached,
It may not be able to withstand water pressure and groundwater may enter.

Further, the method of adjusting the position of the pipe by packing the crosspiece or the like is inferior in accuracy, and since the crosspiece or the like is rigid, the shock received by the pipe cannot be absorbed and the shock is transmitted to the manhole body. become.

An object of the present invention is to attach a flexible joint to a drilled surface of a manhole with an arbitrary amount of compression, and to accurately position a pipe such as a sewer pipe on the drilled surface of the manhole.

[0008]

According to the present invention, there is provided a joint structure comprising a drilled surface of a manhole and a flexible joint, wherein the flexible joint is attached to the drilled surface. The flexible joint has a drilling contact portion that is in close contact with the drilling surface, and a rigid extension fixing band is disposed inside the drilling contact portion, and a fastener is attached to the extension fixing band. A guide groove is provided, the guide groove is provided along a length direction of the extension fixing band, the fastener is passed through the guide groove, and the extension fixing band is expanded, According to a joint structure in which the fastener is tightened so that the drilled contact portion is expanded and pressed from the inside of the drilled contact portion toward the drilled surface to be in close contact with the drilled surface. It is.

The present invention also relates to a pipe positioning device for positioning a pipe connected to the drilling surface with respect to a drilling surface of a manhole, wherein the pipe positioning device comprises an elastic body and a rigid body. And a plurality of rigid expansion and contraction jigs, wherein the elastic body is disposed on the outer periphery of the tube, the plate is disposed on the outer periphery of the elastic body, and one end of each of the expansion and contraction jigs is provided on the plate. A pipe positioning device in which the other end of each of the telescopic jigs is pressed against the drilled surface, and each of the telescopic jigs is expanded and contracted to adjust the distance between the drilled surface and the pipe. It is related to.

The inventor of the present invention has found that the water pressure resistance of the joint structure is significantly improved by expanding the expansion fixing band and fixing the expansion fixing band at an arbitrary position where the flexible joint has reached a predetermined compression amount. The inventors have found that the present invention has been achieved.

Further, the present inventor has proposed that the impact of the pipe is reduced by interposing an elastic body for absorbing the impact of the pipe such as a sewer pipe and a rigid expansion / contraction jig between the pipe and the manhole hole. The present inventors have found that it is possible to relax the position of the pipe and to accurately position the pipe, and have completed the present invention.

According to the joint structure of the present invention, the expansion fixing band can be expanded by an arbitrary amount of compression, and the flexible joint can be brought into close contact with the drilled surface of the manhole. Further, according to the pipe positioning device of the present invention, it is possible to accurately position these pipes at predetermined positions on the drilled surface of the manhole while absorbing the impact of pipes such as sewer pipes.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the joint structure of the present invention, a rigid expansion fixing band is used to attach a water-stopping flexible joint to a drilled surface of a manhole. The extension fixing band has a fastener and a guide groove. This guide groove is provided along the length direction of the expansion fixing band, and the expansion fixing band has a portion where the water-stopping flexible joint is in close contact with the drilling surface of the manhole, that is, a drilling contact portion. It is arranged inside.
The fastener is passed through the guide groove, the expansion fixing band is expanded, and the fastener is tightened, so that the drilling close contact portion of the water-stop flexible joint expands from the inside toward the drilling surface of the manhole. It is pressed and adheres to the drilling surface.

The waterstop flexible joint used in the present invention may have a substantially cylindrical tubular portion made of an elastic material. The tubular portion of the water-stopping flexible joint is expanded and pressed from the inside toward the manhole drilling surface and fixed by the rigid expansion fixing band of the present invention.

The extended fixing band of the present invention may be in the form of a rigid ring. The ring-shaped expansion fixing band has a fastener and a guide groove, and the space between the locking tools is expanded by an appropriate expansion tool. The fixing band is extended and fixed. Such extended fixed band
If the water stop flexible joint can be brought into close contact with the manhole drilling surface with an arbitrary compression amount, the joint may be expanded and fixed by various appropriate means.

The extended fixed band of the present invention may be one in which one part of the circumference of the ring is cut in a direction perpendicular to the ring surface. One end of the cut end of the ring is provided with a plate-shaped guide having a groove in the center. The other end of the cut end of the ring is provided with a fastener passed through the guide groove. The fastener slides in the guide groove and is fastened at a predetermined position. The guide groove and the fastener function to separate the cut ends of the ring from each other and to provide a predetermined expansion width to the expansion fixing band to fix the band.

A bolt and a nut can be used in the fastener according to the present invention. In such a joint structure, the flexible joint can be more securely and firmly brought into close contact with the drilled surface of the manhole. In this case, the bolt is provided in advance on the extension fixing band. The bolt is passed through the guide groove and arranged at a predetermined position, and the nut is tightened so as to press the guide groove from the end of the bolt.

Further, in the joint structure of the present invention, a bolt and a nut are used as fasteners, and at least one wedge-shaped object is provided on the expansion fixing band, and the wedge-shaped object is formed with a tip portion having a width smaller than the width of the guide groove. It is preferable to design so as to have a base portion having a width larger than the width of the guide groove. In such a joint structure, when the bolt is tightened with the nut, the tip of the wedge-shaped object passes through the guide groove, and the bottom side of the wedge-shaped object is fixed by biting into the guide groove. Even if it is loosened, it is possible to prevent the expansion fixing band from loosening. Such a joint structure can prevent the bolt from loosening due to vibration of a vehicle or the like after construction, or prevent the band from returning to the original state due to the expansion reaction force of the expansion band, and can maintain the expansion force of the band for many years. .

According to the present invention, an elastic body, a rigid plate, and a plurality of rigid expansion / contraction jigs are included in order to determine the positions of the drilled surface of the manhole and the pipe connected to the drilled surface. A tube positioning device is used. Various telescopic jigs can be used as long as they can be adjusted so that the distance between the pipe and the drilling surface can be kept constant.

An expansion / contraction jig composed of a bolt, a nut, and a rigid cylindrical body can be used as the tube positioning device. A rigid plate is pressed against one end of the bolt, and a nut is fastened to the other end of the bolt. The nut is pressed against one end of the tubular body, and the other end of the tubular body is pressed against the drilled surface of the manhole. In such a pipe positioning device, by adjusting the tightening position of the nut, the distance between the drilled surface of the manhole and the pipe can be accurately adjusted, and the pipe can absorb shocks such as an earthquake and a car.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a joint structure according to an example of the present invention. FIG. 2 is a front view of the joint structure of FIG. 1 as viewed from inside a manhole. FIG. 3 is a front view of the joint structure of FIG. 1 as viewed from the outside of the manhole.

As shown in FIG. 1 and FIG.
And the pipe 2 are connected by a water stop flexible joint 4. The extended fixing band 5 according to an example of the present invention is a part of a ring. The hole is expanded and the hole contact portion 4a is in close contact with the hole surface 3 of the manhole 1. The pipe 2 is passed through the tubular portion 4 b of the water-stopping flexible joint 4, and is fixed by a fastening band 17. A bolt 8 is passed through a groove 7 provided at the center of the guide 6, and the extended fixing band 5 is fastened and fixed by tightening the bolt 8 with a nut 9.

The extended fixed band 5 shown in FIGS.
A ring-shaped band partially cut is used.
At one cut end of the band, a guide 6 having one end fixed to the inner peripheral surface of the end of the band is provided, and the guide 6 has a groove 7 at the center. One bolt 8 is fixed to the other cut end of the band toward the center of the ring. After expanding the fixed band 5 by a predetermined amount with the bolt 8 inserted in the guide groove 7, The nut 9 is tightened to fix the guide 6 to the bolt 8 at the other end of the extension fixing band 5. Thereby, the extension fixing band 5 can be fixed at an arbitrary position in the guide 6.

FIG. 3 shows the locking members 18, 18 '. These locking members 18 and 18 ′ are used when expanding the expansion fixing band 5. These locks are separated from one another using a suitable expansion tool to expand the expansion fixation band to the desired position.

FIGS. 1 and 2 show a tube positioning apparatus according to an embodiment of the present invention. The pipe 2 is positioned with respect to the drilling surface 3 by the pipe positioning device 10 according to an example of the present invention. The pipe positioning device 10 is provided along the outer circumference of the pipe 2, and the elastic body 1 is provided on the side in contact with the pipe 2.
A rigid cylindrical body 15 is disposed on the side where the plate 1 and the rigid plate 12 are in contact with the drilling surface 3. In these telescoping jigs 16, a bolt 13 for tightening a nut 14 to a predetermined position has one end inserted into the cylindrical body 15, and the other end of the bolt 13 is pressed against the rigid plate 12. I have. In such an expansion / contraction jig, the position of the pipe 2 with respect to the drilling surface 3 can be adjusted by adjusting the position at which the nut 14 is tightened. If a female screw is provided inside the cylindrical body, no nut is required.

As shown in FIG. 2, the tube positioning device 10
Then, the telescopic jigs 16 are provided from three directions, and the height of each telescopic jig is adjusted, so that the pipe 2 can be adjusted to a desired position. Each extension jig may be of the same type or of a different type.

FIG. 4A is a front view of the pipe positioning device after construction. FIG. 4 (b) is a side view of the tube positioning device of FIG. 4 (a). FIG. 4A is a tube positioning device viewed from the inside of a manhole, and FIG.
It is a tube positioning device viewed from the side of the tube. FIG. 4 (a)
As shown in FIG. 4 and FIG.
At 0, the elastic body 11 and the rigid plate 12 are each divided into two parts, and are connected to each other between their ends to surround the tube 2. Bolt 13, nut 14,
A total of four telescopic jigs 16 composed of the tubular body 15 are arranged, and support the rigid plate 12 from the periphery.

FIG. 5 is a plan view of an example of the extension fixing band. In FIG. 5, the end of the guide 6 is fixed to one end 5 ′ of the expansion fixing band by welding 21. This guide 6
Is provided with a groove 20 at the center thereof. A bolt 8 is provided at the other end 5 ″ of the extension fixing band, and a nut 9 is tightened from above so as to sandwich the guide groove 20. After being slid along 8 and expanded to a desired position, it is tightened by bolts 8 and nuts 9.

FIG. 6A is a perspective view of another example of the extension fixing band. FIG. 6B is a cross-sectional view of the extension fixing band of FIG. 6A taken along the line AA ′. FIG. 6 (c)
FIG. 7 is a cross-sectional view of the extended fixing band of FIG. As shown in FIG. 6A, two bolts 8, 8 'are fixed in a groove 20 at the center of the guide 6. Between bolts 8 and 8 ', A-
A wedge-shaped object 30 having a bottom side width a larger than the guide groove width b is provided as shown in the section A '. When the guides 6 are tightened by the bolts 8 and 8 'and the nuts 9 and 9', respectively, a section taken along the line AA 'in FIG. 6B and a line BB' in FIG.
As shown in the cross-section, the tip of the wedge-shaped object cuts into the groove 20 to exert the effect of fixing the guide 6 and preventing displacement.

FIG. 7A is a longitudinal sectional view of still another extension fixing band. FIG. 7B is an enlarged perspective view of a part of the extension fixing band of FIG. 7A. 7 (a) and 7 (b), the extension fixing band 5 is attached by the fixing device 40. The fixing device 40 prevents the extension fixing band 5 from being pushed into the inside of the manhole.

The fixing device 40 includes an extended fixing band 5
And a positioning tool 41 attached to the push prevention tool 42.
The push-in prevention device 42 includes a locking portion, for example, a portion including the bolt 8 and the nut 9, and a protrusion 43 formed by bending one end of the push-in prevention device 42. The positioning tool 41 is provided with a positioning groove 44 in the length direction thereof, so that the restraining portion 4 for restraining the surface of the manhole 1 is provided.
1a is provided. The positioning tool 41 bends from the drilling surface 3 to the outer periphery of the manhole 1 around the drilling surface 3 to form a restraining portion 41 a to restrain the surface of the manhole 1.

As shown in detail in FIG. 7B, the positioning tool 41 is provided with a positioning groove 44. The positioning groove 44 has a bolt 8
The nut 8 is fastened to the bolt 8. The protruding portion 43 of the push-in prevention tool 42 has a tip inserted into the positioning groove 44 and a bottom portion cut into the positioning groove 44. The end of the push-in prevention device 42 is fixed to the expansion fixing band 5 by welding.

By fixing the extension fixing band in this manner, it is possible to prevent the flexible joint and the like from being pushed into the inside of the manhole by the soil water pressure after construction. Also,
In such a fixing device, since the shape of the drilled portion and the outer shape of the manhole at the drilled portion differ depending on the type of manhole, it is desirable that the length of the fixing device can be freely adjusted.
With the configuration shown in FIGS. 7A and 7B, the locking portion can be slid into the positioning groove, and the extended fixing band can be fixed at the optimum position without shifting.

In any of the above-mentioned examples, the materials of the extension fixing band, the wedge-shaped object, the guide, the rigid plate, the cylindrical body, the push-in prevention tool, the positioning tool, etc. are stainless steel, aluminum, rust-proof plated steel, rust-proof steel. Metals such as coated steel,
Alternatively, a hard plastic such as a vinyl chloride resin, an ABS resin, or polyethylene terephthalate, or a plastic reinforced with a fiber such as FRP can be used. As the elastic body, styrene-butadiene rubber, EP
It can be selected from synthetic rubbers and natural rubbers such as DM and chloroprene, and soft vinyl chloride resins, vinyl chloride-based elastomers, and styrene-based thermoplastic elastomers.

Test Example 1 FIG. 8 is a sectional view of a test device for a joint structure. As schematically shown in FIG. 8, the drilled portion of the manhole 1 is
(A) to (c), an extension fixing band made of stainless steel is arranged, an EPDM rubber water-stop flexible joint 4 having a JIS-A hardness of 60 is attached, and the pipe 2 is connected to the jack 51 using a jack 51. To the flexible joint, and a test container 50 was set outside the manhole. The pipe 2 was a vinyl chloride pipe having a nominal diameter of 200 mm, the manhole 1 was a No. 1 manhole, and the bore diameter was 304 mm or 309 mm. In addition, as shown in FIG. 8, even in a state where the central axis of the pipe 2 was displaced by the angle θ, a water leak test at a water pressure of 1 kgf / cm ² for 3 minutes was performed.

As a result, drilling diameters of 304 mm and 309 m
No occurrence of water leakage was observed in any of m. Also, in the test in which the central axis of the pipe was displaced by 15 degrees, no water leakage was observed for both the hole diameters of 304 mm and 309 mm.

Test Example 2 As shown in FIGS. 4 (a) and 4 (b), the pipe positioning device 10 was attached to the pipe 2, and the position of the drilled surface 3 and the pipe 2 was turned by the nut 14. Adjusted. It was easily and accurately attached to the set position.

[0038]

As is apparent from the above description, according to the present invention, the flexible joint can be fixed at the optimum position by the expansion fixing band even if the diameter of the manhole is varied, and the wedge-shaped object is provided in the guide groove. The bite-in and fixation can prevent the displacement of the flexible joint, and can obtain stable watertightness. In addition, the pipe positioning device can easily and accurately adjust the position of the pipe, and the elastic body provided on the pipe side can absorb the shock received by the pipe, preventing damage to the pipe and maintaining the flow gradient of sewage. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint structure according to an example of the present invention.

FIG. 2 is a front view of the joint structure of FIG. 1 as viewed from inside a manhole.

FIG. 3 is a front view of the joint structure of FIG. 1 as viewed from the outside of the manhole.

FIG. 4A is a front view of the pipe positioning device after construction. (B) is a side view of the tube positioning device of (a).

FIG. 5 is a plan view of an example of an extension fixing band.

FIG. 6A is a perspective view of another example of an extension fixing band. (B) is sectional drawing which cut | disconnected the extended fixing band of (a) along the AA 'line. (C) is sectional drawing which cut | disconnected the extended fixing band of (a) along the BB 'line.

FIG. 7A is a longitudinal sectional view of still another extension fixing band. (B) is the perspective view which expanded a part of expansion fixed band of (a).

FIG. 8 is a cross-sectional view of a test device for a joint structure.

FIG. 9 (a) is a rear view of the water stop flexible joint.
(B) is a longitudinal sectional view of a water stop flexible joint.

FIG. 10 is a longitudinal sectional view of a conventional manhole structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Pipe 3 Drilled surface 4,54 Waterproof flexible joint 4a Drilled hole contact portion 4b Tubular portion 5 Extended fixed band 5 'One end of extended fixed band 5 "The other end of extended fixed band 6 Guide 7,20 Guide grooves 8, 8 ', 13 Bolts 9, 9', 14 Nuts 10 Pipe positioning device 11 Elastic body 12 Rigid plate 15 Cylindrical body 16 Telescopic jig 17 Fastening band 18, 18 'Locking tool 30 Wedge-shaped object 40 Fixing device 41 Positioning tool 41a Restraining part 42 Push-in prevention tool 43 Projecting part 44 Positioning groove 55 Crosspiece 56 Expansion ring 57 Special jack 70 Connection part 60 Concrete roll-up

Claims (6)

[Claims] 1. A joint structure comprising a drilled surface of a manhole and a flexible joint, wherein the flexible joint is attached to the drilled surface. It has a drilling contact portion that is in close contact with the hole surface, a rigid extension fixing band is arranged inside the drilling contact portion, and a fastener and a guide groove are provided in the extension fixing band. The guide groove is provided along the length direction of the extension fixing band, the fastener is passed through the guide groove, the extension fixing band is expanded and the fastener is tightened, The joint structure, wherein the drilling contact portion is expanded and pressed from the inside of the drilling contact portion toward the drilling surface to be in close contact with the drilling surface. 2. A push prevention device having a locking portion is attached to the extension fixing band, a positioning tool having a positioning groove is attached to the push prevention device, and the positioning groove is The positioning tool is provided in the length direction, and the positioning tool is provided with a restraining portion for restraining the surface of the manhole, and a tip having a width smaller than the width of the positioning groove and the positioning groove are provided. A protruding portion having a bottom portion having a width larger than the groove width is provided on the push-in preventing device, the surface of the manhole is restrained by the restraining portion, and the locking portion and the protruding portion are aligned with the positioning portion. When the locking portion is locked by being passed through the groove, the bottom side portion of the protruding portion bites into the positioning groove, and the extended fixing band is prevented from being pushed into the manhole. 2. The method according to claim 1, wherein
The described joint structure. 3. A rigid extended fixed band used for attaching a flexible joint to a drilled surface of a manhole, wherein the flexible joint has a drilled contact portion that is in close contact with the drilled surface. The extended fixing band has a fastener and a guide groove, and the guide groove is provided along a length direction of the extended fixing band, and the extended fixing band is provided inside the hole contact portion. A band is arranged, the fastener is passed through the guide groove, the extended fixed band is expanded, and the fastener is tightened, so that the drilled contact portion is cut from the inside of the drilled contact portion. An extended fixing band, which is expanded and pressed toward a hole surface, and the drilling contact portion is closely attached to the drilling. 4. The fastener according to claim 1, wherein the fastener comprises a bolt and a nut, and the extended fixing band is provided with at least one wedge-shaped member. A bottom portion having a width larger than the groove width of the guide groove, and when the bolt is tightened by the nut, a tip portion of the wedge-shaped object passes through the guide groove, and the bottom portion of the wedge-shaped object is Biting into the guide groove, even if the bolt and the nut are loosened,
The extension fixing band according to claim 3, wherein the extension fixing band is prevented from being loosened. 5. A pipe positioning device for positioning a pipe connected to a drilling surface with respect to a drilling surface of a manhole, the pipe positioning device comprising: an elastic body; a rigid plate; Including a plurality of rigid expansion and contraction jigs, wherein the elastic body is disposed on the outer periphery of the tube, the plate is disposed on the outer periphery of the elastic body, and one end of each of the expansion and contraction jigs is pressed against the plate, The other end of each of the telescopic jigs is pressed against the drilled surface, and each of the telescopic jigs is expanded and contracted, the distance between the drilled surface and the pipe is adjusted, and the pipe is positioned at a predetermined position. A tube positioning device, characterized in that: 6. Each of the telescopic jigs includes a bolt, a nut, and a rigid tubular body, one end of the bolt is pressed against the plate, and the nut is fastened to the other end of the bolt. A nut is pressed against one end of the cylindrical body, and the other end of the cylindrical body is pressed against the drilling surface,
The tube positioning device according to claim 5, wherein a distance between the hole and the tube is adjusted by adjusting a tightening position of the nut.