JP2002256580A - Manhole structure, cut-off flexible joint for manhole, and construction method for manhole structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole structure not affected by earth pressure of embedded earth and capable of enough exhibiting flexibility and cut-off performance of a cylindrical flexible body between a manhole and a pipe. SOLUTION: In this manhole structure 1, a manhole 2 made of concrete and a pipe 3 are connected by a cut-off flexible joint 4 for the manhole. In the manhole structure 1, the cut-off flexible joint 4 for the manhole is provided with a rigid cylindrical body 5 and an inside cylindrical flexible body 6 of the cylindrical body 5. The cylindrical body 6 is formed by an elastic body 6. One end part 6a of the cylindrical flexible body 6 is press-bonded and fixed to the inner surface of the cylindrical body 5, and the other end part 6b of the cylindrical flexible body 6 is press-bonded and fixed to the outer periphery of the pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole structure in which a manhole is connected to a pipe such as a sewer pipe, a watertight flexible joint for a manhole for obtaining such a manhole structure, and a method of constructing the manhole structure.

[0002]

2. Description of the Related Art Conventionally, the connection between a manhole and a pipe has been mainly carried out by a method of wrapping concrete at a connection portion. However, since water is likely to enter due to cracks caused by waiting for concrete hardening time, land subsidence, earthquakes, etc., water-tight flexible joints made of rubber or soft plastic are being used in many cases. It has become.

[0003] Even if the relative positional relationship between the manhole and the pipe is displaced due to displacement of the ground or the like, such a joint can follow such displacement and maintain watertightness.

[0004] As a watertight flexible joint for a manhole, one described in Japanese Patent Application Laid-Open No. 9-32020 is known.

FIG. 29 shows a known water shutoff flexible joint. FIG. 29 is a longitudinal sectional view of a conventional manhole connection structure.

In the manhole connection structure 161, one end 162a of the rubber flexible portion 162 is connected to the drilled surface 2 of the manhole 2.
a with an expansion band 163, and the other end 162 b of a rubber flexible portion 162 that covers the outer periphery of the pipe 3 such as a sewer is fastened with a fastening band 164, and the rubber flexible section 152 is attached to the pipe 3.
Is fixed by crimping.

As a result, in the manhole connection structure 161, the joint between the manhole 2 and the pipe 3 such as a sewer is made flexible and water-tight is ensured (Japanese Patent Laid-Open No. Sho 51-10).
652).

[0008] A flexible joint using a rigid collar is also known ["Seismic Flexible Joint S Joint (trade name)", published by Nihon Zenith Pipe Co., Ltd., July 2001). FIG. 30 is a sectional view of another manhole connection structure constructed by such a flexible joint.

In such a manhole structure, as shown in FIG. 30, a flexible joint 201 is attached to a steel collar 202 with a fixing band 203 and a pipe 3 with a fastening band 204. Mortar 206
The method of filling and fixing with is adopted.

[0010]

According to the study of the present inventor, in a joint as shown in FIG. 29, a method of fixing a cylindrical rubber molded product to a manhole drilling surface with an expansion band is generally used. However, it has been found that this method cannot be applied to a sewer pipe having a large drilling diameter of 400 mm or more because the extension band protrudes from the drilling surface.

On the other hand, in the joint as shown in FIG. 30, since the steel collar 202 is used, the extension band does not protrude from the drilled surface of the manhole.

However, according to the research of the present inventors,
In the joint shown in FIG. 30, it was found that the bellows portion was deformed as shown in FIG. FIG. 31 is a sectional view of a manhole connection structure in buried soil.

When the flexible joint 201 is attached and fixed to the rigid collar 202 and the pipe 3 and back-filled, when the earth pressure F is applied by the buried soil 207, the bellows portion 201a of the flexible joint 201 becomes like 201b. It is compressed and deformed.

The bellows portion 201b that has been compressed and deformed
When the displacement of the pipe in the direction occurs, it cannot be expanded or contracted, the portion B in the vicinity of the fixing band 203 is locally elongated, and when the displacement is large, the portion B is broken or the flexible joint 201 is fixed. There is a risk of detachment from the band 203. Such a danger may occur in a joint as shown in FIG. 29 as well.

According to the study of the present inventor, the manhole is manufactured in a factory, and the hole into which the sewer pipe is inserted is cored to a designated position by a concrete drilling machine before shipment.
The flexible portion made of rubber was fixed to the drilled surface by pressure bonding with an extension band. However, it was found that the drilled surface was not necessarily smooth, and there was a high risk of water leakage.

Diamond is embedded in the cutting edge of a concrete drilling machine, and it cuts both mortar and aggregate. However, the vibration of the drilling machine causes irregularities of about 2 to 3 mm. In particular, when the drilling speed is increased, the unevenness increases.

Further, the concrete itself contains some air bubbles, which may also cause irregularities. These irregularities on the drilled surface are likely to cause water leakage.

The rubber flexible portion is required to be fixed to the manhole drilled surface with an expansion band by pressure bonding and to stop water, and to absorb displacement while withstanding water pressure. The rubber portion must have a certain degree of hardness and be non-creep rubber. .

However, in the case of such a rubber material, the expansion force of the expansion band alone cannot completely follow the unevenness of the manhole drilling surface and may leak water.

FIG. 32 is a vertical cross-sectional view showing a press-fit state between a drilled surface of a manhole and a rubber flexible portion. As shown in FIG. 32, the drilling surface 2a of the manhole 2 has irregularities,
Even if an attempt is made to press the rubber flexible joint 171 with the expansion band 172, sufficient adhesion cannot be obtained.

Further, as the number of drilling increases, the cutting edge of the drilling machine wears, and the drilling diameter decreases by 2 to 3 mm. Then
Crimping cannot be performed with a predetermined extension band.

In order to solve the above-mentioned problems, it is necessary to install a water-stopping flexible joint by a manufacturer that manufactures manholes that have a good quality control.

An object of the present invention is to provide a manhole structure capable of sufficiently exhibiting the flexibility and waterproofness of a tubular flexible body between a manhole and a pipe without being affected by earth pressure of a buried soil. It is to get.

Further, the object of the present invention is to provide a manhole without being affected by unevenness, curvature, and design error of a drilled surface of a manhole.
An object of the present invention is to obtain a manhole structure exhibiting excellent water stopping properties.
It is a further object of the present invention to provide a watertight flexible joint for manholes which is excellent in flexibility and waterstop of a tubular flexible body.

[0025]

According to the present invention, there is provided a manhole structure in which a concrete manhole and a pipe are connected by a watertight flexible joint for manholes. A rigid tubular body, comprising a tubular flexible body inside the tubular body, the tubular flexible body is formed from an elastic body, one end of the tubular flexible body is It is crimped and fixed to the inner surface of the cylindrical body,
The present invention relates to a manhole structure, wherein the other end of the tubular flexible body is crimped and fixed to the outer periphery of the pipe, a watertight flexible joint for manhole used in the manhole structure, and a method of constructing the manhole structure. Things.

The present inventor has made various trials and examined various manhole structures capable of sufficiently exhibiting the flexibility and the waterproofness of a flexible joint without being affected by the earth pressure of the buried soil.

As a result, the present inventor provided a flexible joint for manholes to be applied to a joint portion between a concrete manhole and a pipe, and provided a tubular body for securing a space outside the pipe, It has been found that the presence of the tubular flexible body in the space between the body and the pipe allows the connecting portion to have a highly water-resistant flexible structure.

Based on this finding, the present inventor has concluded that the tubular flexible body between the tubular body and the pipe has a flexible connecting portion, and the displacement of the pipe is not affected by the earth pressure. It can demonstrate flexibility,
They have found that watertightness can be maintained, and have reached the present invention.

According to the manhole structure of the present invention, a space capable of exhibiting the flexibility and watertightness of the tubular flexible body is secured between the rigid tubular body and the pipe. The cylindrical flexible body is not affected by the earth pressure after burial,
Follows the relative displacement between the manhole and the tube well and maintains water tightness.

[0030]

Embodiments of the present invention will be described.
In order to obtain a manhole structure having excellent water-stopping properties, the present inventors further prototyped and examined various water-stopping flexible joints.

As a result, the present inventor has found that when the conventional rubber flexible joint is directly fixed to the drilled surface of the manhole by press-fitting with an expansion band, if the manhole diameter is small or the pipe diameter is large, the expansion band is used. It has been found that it is difficult to crimp a rubber flexible joint uniformly over the entire circumference of a manhole drilling surface.

FIG. 33 is a longitudinal sectional view of a conventional manhole structure. FIG. 34 is a cross-sectional view of the manhole structure of FIG.

In the manhole structure 181, the extension band 1
As shown in FIGS. 33 and 34, 82 is made of steel, and even if the left and right sides of the extension band 182 are aligned with the drilling surface 2a that is full outside the manhole 2, the top and bottom of the extension band 182 are partially Therefore, the function of crimping the rubber flexible joint 183 cannot be sufficiently performed.

It is possible to match the extension band to the arc of the manhole, but in this case the extension force escapes in the longitudinal direction of the tube, again failing to sufficiently fulfill the function of crimping the rubber flexible joint.

Based on these findings, the present inventors have prototyped a flexible manhole joint which can be applied to manhole drilled holes having various curved surfaces without being affected by the diameter of the manhole and the diameter of the pipe in a state of extremely high water stopping. ,investigated.

As a result, the present inventor provided a manhole flexible joint to be applied to a joint between a concrete manhole and a pipe manufactured in a factory, and provided a cylindrical body for securing a space outside the pipe. It has been found that the presence of the cylindrical rubber flexible body in the space between the cylindrical body and the tube allows the joint to have a highly water-resistant flexible structure.

The inventor of the present invention provided a band-shaped water-stopping material made of a low modulus elastomer in a gap between the outer periphery of the cylindrical body and the diameter of the manhole hole, and compressed the band-shaped water-stopping material with a compression tool. As a result, it has been found that water can be reliably stopped between the outer peripheral surface of the cylindrical body and the manhole drilling surface.

According to the present invention, one end of the tubular flexible body is fastened to the outer periphery of the tube with a fastening band and fixed by crimping, and the opposite end of the tubular flexible body is attached to the inner surface of the tubular body. Is fixed by crimping with an expansion band, and the cylindrical flexible body between the cylindrical body and the pipe can have a flexible structure at the joint.

In the present invention, the compression tool has a ring-shaped flange, a slide ring, a nut and a bolt. Such a compression tool can compress the band-shaped waterproof material from inside or outside the manhole.

In such a compression tool, the bolt is fastened to the nut, so that the slide ring compresses the band-shaped water blocking material in the pipe axis direction, and the compressed band-shaped water blocking material transmits stress in the direction perpendicular to the pipe axis, and Surface pressure is generated between the peripheral surface and the manhole drilling surface, and water can be reliably stopped between these surfaces.

In the present invention, the irregularities on the drilled surface of the manhole
Water leakage due to the curved surface of manhole drilling and errors can be prevented. Further, according to the present invention, it is not necessary to attach the manhole in advance in the manhole drilling portion as in the conventional flexible joint, and even after completion of the laying of the sewer pipe as in the propulsion method, the connection structure between the manhole and the pipe is constructed. It is possible.

In the manhole structure of the present invention, a concrete manhole and a pipe are connected by a watertight flexible joint for manhole.

(1) Waterproof Flexible Joint for Manhole The watertight flexible joint for manhole according to the present invention comprises a rigid tubular body and a tubular flexible body inside the tubular body. .

Further, the watertight flexible joint for manholes according to the present invention comprises a rigid tubular body, a tubular flexible body inside the tubular body, and a band-like waterproof material outside the tubular body. And a compression tool.

(1-1) Cylindrical Body The cylindrical body used in the present invention is provided outside the pipe, and has a space between the pipe and the cylindrical body for inserting a cylindrical flexible body. . In addition, such a tubular body can be a base for pressing the band-shaped water-stopping material provided outside the tubular body to the hole of the manhole.

The tubular body has the rigidity necessary for pressing the band-shaped water blocking material into the hole of the manhole and for fixing the tubular flexible body with the extension band.

The material of the cylindrical body may be metal such as stainless steel, aluminum, rust-proof plated steel, rust-proof coated steel, hard plastic such as vinyl chloride resin, ABS resin, PET, and fiber reinforced plastic such as FRP. At least one selected from the group consisting of: Each of these materials is desirable because it hardly corrodes. In addition, it is desirable to select a fixing band, a fastening band, a positioning plate, and the like to be described later from these materials.

In particular, such a tubular body is preferably made of steel, and is preferably a tubular one such as a cylindrical tube, and more preferably one having excellent corrosion resistance, for example, one made of stainless steel.

According to the present invention, the space between the cylindrical body and the hole of the manhole can be filled with mortar or the like and can be fixed with water stoppage. As a result, the tubular body is firmly connected to the manhole, and a structure capable of exhibiting the water stopping property is obtained.

The mortar uses a fast-hardening cement, and a water-stopping mortar which has a small shrinkage and excellent adhesiveness and waterproofness is suitable.

(1-1-1) Flange The flange according to the present invention may be provided with a flange. Such a flange can contact the outer wall of the manhole to perform positioning between the manhole and the tubular body.

The positioning by the flange can be performed by a flange having an outer diameter larger than the diameter of the manhole when the cylindrical body is inserted into the hole of the manhole from the outside of the manhole.

It is desirable that the flange be made of a material which is hardly corroded, such as stainless steel or hard plastic.

In the present invention, a water blocking material can be provided between at least one of the space between the cylindrical body and the wall of the manhole and between the flange and the wall of the manhole. Such waterproof material is
As a water stop layer, it functions to prevent groundwater or the like that intrudes from between the drilled portion of the manhole and the cylindrical body.

The water-stopping material is not particularly limited, but as the water-stopping layer, a butyl rubber-based sealing material having excellent adhesiveness to ready-mixed concrete or mortar, or a water-swelling material which reacts with water and expands to exhibit water-stopping properties. It is desirable to use a sealing material. Particularly preferably, a butyl rubber-based sealing material can be used.

(1-2) Cylindrical Flexible Body The tubular flexible body according to the present invention can have one end fixed to the inner surface of the tubular body by an expansion band and the other end connected to a fastening band. Thus, it can be fixed to the outer periphery of the pipe by crimping.

In the present invention, such a tubular flexible body is formed from an elastic body. Such an elastic body needs to be flexible enough to absorb the displacement between the manhole and the pipe, but is not particularly limited, and includes elastic bodies made of various materials.

The elastic material used for the tubular flexible body according to the present invention is styrene-butadiene rubber, EPDM, CR
And at least one selected from the group consisting of synthetic rubber, natural rubber, soft vinyl chloride resin, vinyl chloride-based elastomer, styrene-based thermoplastic elastomer, and the like.

Of these elastic bodies, rubber is particularly preferred. The reason is that the tubular flexible body formed of rubber has elasticity in the material itself, can be expanded and contracted, and is suitable for exhibiting the followability to the displacement of the pipe.

(1-2-1) Bellows The cylindrical flexible body according to the present invention is not particularly limited in shape, material and the like, but the tubular flexible body is provided with a bellows. be able to. Such a bellows part moves and expands and contracts smoothly, making the tubular flexible body more flexible. The cylindrical flexible body having such a bellows portion is excellent in the displacement of the relative position between the manhole and the pipe, in particular, the flexibility and the waterproofness against the displacement and the pushing displacement of the pipe.

According to the present invention, at least the bellows of the tubular flexible body can be accommodated in the space between the tubular body and the pipe. Such a bellows portion exerts sufficient flexibility against displacement between the manhole and the pipe without being affected by the earth pressure of the buried soil, and maintains watertightness.

Further, according to the present invention, when the bellows portion is extended due to the displacement of the tube, the bellows portion can be accommodated in the space between the tubular body and the tube. In such a case, the bellows portion secures a space that can be sufficiently extended between the tubular body and the pipe, and is extremely effective for watertightness of the manhole structure.

The cylindrical body used in such a case has such a length that the bellows part can be accommodated in the space between the cylindrical body and the pipe even if the bellows part is extended due to the displacement of the pipe being withdrawn. Having.

(1-3) Band Waterproof Material The band waterproof material used in the present invention is formed of a material such as vulcanized rubber, liquid rubber, or the like. It is made of a material that is sandwiched and generates a compression restoring force.

Further, the band-shaped water blocking material is made of a material which easily transmits the compressive restoring force of the rubber material to the drilled surface of the manhole and the outer peripheral surface of the cylindrical body, and which can easily follow the unevenness of the drilled surface of the manhole. Things.

Such a band-shaped waterproof material is formed from a low modulus elastomer. Such a low modulus elastomer is an elastomer having a surface hardness of 10 or less in a type A hardness tester specified in JIS K6253.

Such elastomers are not restricted by any material, and can be crosslinked products of various rubbers such as natural rubber and synthetic rubber alone or as a mixture, thermoplastic elastomers such as vinyl chloride, urethane and block polymers, or foams thereof. The body is usable.

In particular, in the present invention, the water-stopping property is a necessary function. In view of this point, preferably, natural rubber or synthetic rubber is used as a raw material and non-foamed extremely low-hardness crosslinking (generally vulcanization) ) Good body.

(1-4) Compression Tool The compression tool used in the present invention includes a flange, a slide ring,
It has bolts and nuts.

The flange is provided on the outer surface of the cylindrical body, the nut is fixed to the outer surface of the cylindrical body, and a band-shaped water blocking material is provided between the flange and the slide ring.

In the present invention, the bolt moves the slide ring toward the flange by tightening the bolt into the nut. At this time, the band-shaped water stopping material is compressed in the axial direction of the cylindrical body, and the band-shaped water stopping material swells in the direction of the drilling surface of the manhole and adheres closely.

The compression tool is preferably made of steel, and is particularly preferably made of stainless steel, which has excellent corrosion resistance.

The flange and the slide ring may have a flat plate shape, but preferably have a convex portion on the surface in contact with the band-shaped water blocking material. When the contact surface with the belt-shaped water blocking material is convex, a larger surface pressure can be generated in the direction perpendicular to the tube axis, and the water blocking effect of the obtained manhole structure is also enhanced.

The bolt and the nut can be provided from the inner wall side of the manhole. At this time, three or more sets of guides, bolts, and nuts can be attached to the inner wall side of the manhole of the cylindrical body. Further, the number of bolts and nuts can be increased as the diameter of the target pipe connected to the manhole increases.

Preferably, the compression tool according to the present invention includes a guide having an L-shaped cross section. A nut is fixed to a vertical part of the guide, and a tubular body is fixed to a horizontal part of the guide.

It is preferable that the vertical portion of the guide has a length just protruding above the wall surface of the manhole.
This is because the vertical portion of the guide hits the inner or outer wall of the manhole, and the watertight flexible joint for the manhole is not pushed into the outside or inside of the manhole, and the joint is positioned at a predetermined position.

The guide having an L-shaped cross section is preferably made of steel, and is particularly preferably made of, for example, stainless steel which has excellent corrosion resistance. In addition, the portion exposed in the manhole can be subjected to a treatment such as anticorrosion coating or resin coating.

(4) Detachment Prevention Device It is preferable that a detachment prevention device is provided on the outer surface of the flange of the compression device used in the present invention. Such a stopper prevents a manhole water-tight flexible joint from being inserted into a drilled portion of a manhole.

[0094] The slip-off preventing device includes a pipe and a steel rod longer than the pipe. Such a pipe is fixed to the outer surface of the flange and is arranged in a vertical direction when the manhole structure is viewed in a longitudinal section. The steel rod described above is inserted into such a pipe. The upper end of such a rod is provided with a stopper having an outer diameter larger than the inner diameter of the pipe.

In the manhole structure of the present invention, the lower end of the rod projects on the outer wall surface of the manhole,
The water stop flexible joint inserted from the inner surface of the manhole can be prevented from coming off to the inner surface side of the manhole.

(2) Extension Band The extension band according to the present invention is one in which one end of a cylindrical flexible body is fixed to the inner surface of the cylindrical body by pressure bonding.

The extension band is preferably made of steel, and is particularly preferably made of stainless steel having excellent corrosion resistance.

(3) Fastening Band The fastening band according to the present invention is such that the other end of the cylindrical flexible body is fastened to the outer periphery of the tube by pressure bonding.

The fastening band is preferably made of steel, like the expansion band, and is preferably made of stainless steel having excellent corrosion resistance.

(4) Seal Ring In the present invention, a seal ring can be provided between the tubular body and the pipe so that earth and sand do not flow from outside the manhole structure. Such a seal ring can prevent earth and sand from entering between the tubular body and the pipe and between the tubular body and the tubular flexible body, thereby preventing movement of the bellows portion.

The material of the seal ring is rubber, urethane,
A foam such as polyethylene or polystyrene is suitable.

(5) Support Rubber In the present invention, a support rubber for supporting the end of the pipe can be provided between the tubular body and the pipe. Such a support rubber can buffer the earth pressure of the buried soil received by the pipe and an impact force due to a vehicle or the like, and also facilitates the positioning at the time of installation of the pipe. The material of the supporting rubber is suitably a vulcanized rubber molded product.

(6) Push-in Buffer Rubber Further, in the present invention, a push-in cushion rubber can be provided between the tubular body and the pipe to buffer the push-in displacement of the pipe into the inside of the manhole structure. The push cushion rubber is provided near the inner end of the manhole of the tubular body, and can buffer the plunging of the pipe into the manhole due to an earthquake or the like.

The manhole structure of the present invention has been devised for the connection between the large-diameter pipe and the manhole. As is apparent from the above description, the connection between the medium- and small-diameter pipes and the manhole is provided. It can also be applied to this.

The present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a manhole structure according to an example of the present invention. FIG. 2 is a front view of the manhole structure of FIG.

As shown in FIGS. 1 and 2, in the manhole structure 1, a concrete manhole 2 and a pipe 3 are connected by a manhole waterproof flexible joint 4.

The watertight flexible joint 4 for manholes has a rigid tubular body 5 and a tubular flexible body 6 inside the tubular body 5, and the tubular flexible body 6 is made of an elastic material. Is formed.

One end 6a of the tubular flexible body 6 is
The other end 6b of the tubular flexible body 6 is fixed by pressure to the outer periphery of the tube 3.

FIG. 3 is a longitudinal sectional view of the manhole structure of FIG. FIG. 4 is a horizontal sectional view of the manhole structure of FIG.

As shown in detail in FIGS. 3 and 4, in the manhole structure 1, one end 6 a of the tubular flexible body 6 is attached and fixed to the inner space side of the tubular body 5 by the fixing band 7. The other end 6 b of the tubular flexible body 6 is attached and fixed to the pipe 3 by a fastening band 8. The mortar 9 is used to stop and fix the space between the cylindrical body 5 and the drilled portion 2a.

A seal ring 10 is provided at the outer end of the manhole 2 of the tubular body 5, and a backup material 11 is set at the inner end of the manhole 2 and finished with a decorative mortar 12. ing. In order to reduce the amount of mortar, an auxiliary backup material 11a may be partially used behind the decorative mortar 12 in the horizontal direction of the pipe as shown in FIG.

Further, the cylindrical body 5 is provided with a positioning plate as a flange portion 13 for determining the mounting position of the cylindrical body 5 and facilitating the mounting work.

FIG. 5 is a partial sectional view of an example of a watertight flexible joint for manholes. As shown in FIG. 5, in the watertight flexible joint 4 for manholes, a tubular flexible body 6 is attached to a tubular body 5 with a fixing band 7. In the tubular flexible body 6,
A bellows part 6c is provided.

A positioning plate as a flange 13 is provided outside the cylindrical body 5, and a stopper 14 for positioning the cylindrical flexible body 6 and preventing displacement thereof is provided inside the cylindrical body 5.

The tubular member 5 is provided with a band fastening window 15. The band fastening window 15 is used for inserting the pipe into the watertight flexible joint 4 for manholes, positioning the pipe, and then fastening the fastening band 8. Therefore, after the operation is completed, it is necessary to close the band fastening window 15 with some rigid plate.

FIG. 6A is a side view of an example of a tubular flexible body, and FIG. 6B is a front view of the tubular flexible body of FIG. 6A. As shown in FIGS. 6A and 6B, the tubular flexible body 6 includes one end 6a fixed to the tubular body, the other end 6b fixed to the pipe, and the bellows 6c. Have.

FIG. 7 (a) is a side view of an example of a cylindrical body, and FIG. 7 (b) is a front view of the cylindrical body of FIG. 7 (a).
As shown in FIGS. 7A and 7B, the tubular body 5 has a band mounting window 15, and a flange 13 is provided.

FIG. 8 is a longitudinal sectional view showing a state after backfilling of the manhole structure. As shown in FIG. 8, the manhole structure 1 includes a watertight flexible joint 4 for manholes,
After being fixed to the manhole 2 with the seal ring 10 attached, it is backfilled. The earth pressure of the buried soil 16 is applied to the manhole structure 1.

FIG. 9 is a longitudinal sectional view showing a state in which the tube has been displaced. The manhole structure 1 is in a state 6d in which the extraction displacement C occurs in the tube 3 and the bellows portion 6c of the tubular flexible body 6 is extended. The bellows portion 6c is accommodated in the inner space of the tubular body 5 even in the extended state.

FIG. 10 is a side view of a manhole structure according to another embodiment of the present invention. FIG. 11 is a longitudinal sectional view of the manhole structure of FIG. FIG. 12A is a side view of a cylindrical body according to another example of the present invention, and FIG. 12B is a front view of the cylindrical body of FIG.

As shown in FIGS. 10 and 11, in the manhole structure 21, the cylindrical body 2 shown in FIGS.
5 is attached to the manhole 2 using the watertight flexible joint 24 for manholes. In the tubular body 25, a flange 33 and a water blocking layer 37 are provided.

In the manhole structure 21, an irregular shaped water-swelling sealing material 38 is provided on the drilled surface 2 a of the manhole 2 for improving the water stoppage.

Further, in the manhole structure 21, by providing the water blocking layer 37 between the outer surface of the manhole 2 and the flange 33, intrusion of groundwater or the like from outside the manhole 2 can be prevented.

Furthermore, in the manhole structure 21, when a butyl rubber-based sealing material is used for the water blocking layer 37, the manhole structure exhibits an adhesive property to mortar and the like, and thus a manhole structure exhibiting even more excellent water stopping property is obtained. The manhole structure 21
Then, the tube 2 is supported by the support rubber 39.

FIG. 13 is a longitudinal sectional view of the manhole structure of FIG. 11 viewed from the inside of the manhole. As shown in FIG.
In the manhole structure 21, the waterproof mortar 29 is installed in the gap between the drilled portion 2 a of the manhole 2 and the tubular body 25, and the decorative mortar 32 is installed in the gap between the pipe 3 and the tubular body 25, 3 is supported by a support rubber 39.

FIG. 14 is a longitudinal sectional view of a manhole structure according to still another embodiment of the present invention. FIG. 15 is a cross-sectional view of the manhole structure of FIG. FIG. 16A is a longitudinal sectional view of an example of the push cushion rubber, and FIG. 16B is a sectional view of FIG.
FIG. 4 is a front view of a push-in cushion rubber.

As shown in FIGS. 14 and 15, in the manhole structure 41 of this example, a cylindrical portion as shown in FIG. Is provided. The pushing buffer rubber 60 is provided with a projection 60 a having a thickness for buffering the end of the tube 3.

In the manhole structure 41, even if the pushing displacement D occurs in the pipe 3, the displacement is absorbed by the R portion of the pushing cushion rubber 60, and the manhole structure 41 causes the pipe 3 due to an earthquake or the like.
Can be prevented from being destroyed by pushing.

In the manhole structure 41, a watertight flexible joint 44 for a manhole having a tubular flexible body having a bellows portion.
Is used. The manhole structure 41 has a decorative mortar 52 on the manhole 2 side, and a water blocking layer 57 is provided on the surface of the flange 53 and the cylindrical body 45.
The mortar 49 is filled between the drilled portion 2a and the cylindrical body 45, and the manhole 2 between the pipe 3 and the cylindrical body 45 is filled.
A seal ring 50 is provided at an end in the outward direction.

FIG. 17 is a longitudinal sectional view of a manhole structure according to still another example of the present invention. FIG. 18 is a longitudinal sectional view of a manhole structure according to still another example of the present invention. FIG. 19 shows FIG.
8 is an enlarged longitudinal sectional view of a part of the manhole structure of FIG.

FIG. 20 is a cross-sectional view of the manhole structure of FIG. FIG. 21 is a front view of the joint portion of the manhole structure in FIG. 18 as viewed from the inside. FIG.
It is a perspective view of the 21st water stop flexible joint for manholes.

FIG. 23 is a sectional view showing a construction example of the manhole structure of the present invention. FIG. 24 is a rear view of the water stopping flexible joint for manholes during construction. FIG. 25 is a back view of the watertight flexible joint for manholes after construction. FIG.
FIG. 26 is a side view of the water stopping flexible joint for manholes in FIG. 25.

FIG. 27 is a longitudinal sectional view of a manhole structure according to still another example of the present invention. FIG. 28 is a cross-sectional view of a manhole structure according to still another example of the present invention.

FIG. 17 shows a manhole structure according to another embodiment of the present invention, in which a watertight flexible joint 104 for a manhole according to another embodiment of the present invention is inserted into a drilled portion of a manhole and set. It is shown.

Manhole structure 101 of another example of the present invention
Is a manhole structure in which a concrete manhole 2 and a pipe 3 are connected by a manhole waterproof flexible joint 104.

The manhole water-stopping flexible joint 104 is composed of a rigid tubular body 105, a tubular flexible body 106 inside the tubular body 105, and a belt-like water-stopping material 107 outside the tubular body 105.
And a compression tool 108.

The compressor 108 includes a flange 109, a slide ring 110, bolts 112a and 112b, and nuts 113a and 113b.

The flange 109 is provided on the outer surface of the cylindrical body 105, and the nuts 113a and 113b are
5, and between the flange 109 and the slide ring 110, a band-shaped waterproof material 107 is provided.

The tubular flexible body 106 is formed of rubber, and the belt-shaped water blocking material 107 is formed of a low modulus elastomer.

One end 106a of the tubular flexible body 106 is fixed to the inner surface of the tubular body 105 by crimping with an expansion band 116, and the other end 106b of the tubular flexible body 106 is connected to the pipe 3 by a fastening band 117. It is clamped and fixed to the outer circumference. Since the tubular flexible body 106 has a tubular shape, the tubular flexible body 106 surrounds the tube 3 from the periphery.

The cylindrical body 105 and the tube 3 are formed into a cylindrical flexible body 10.
The connection at 6 secures a space between the tubular body 105 and the pipe 3, and can absorb expansion / contraction displacement, bending displacement, shear displacement, and the like of the sewer pipe without applying a load to the sewer pipe.

[0127] The extension band 116 is
Is fixed inside the cylindrical body 105. Extension band 116
Is a cylindrical flexible body 1 whose circumference extends and expands radially.
06 is pressed against the inside of the tubular body 105. Cylindrical flexible body 10 with extension band 116
The attachment of the end 106a of No. 6 to the inside of the cylindrical body 105 is as follows.
An appropriate adhesive may be selected and fixed.

Further, the other end 106b of the tubular flexible body 106 serves as a tube-side mounting portion, and is fixed by tightening from the outside of the tube 3 using a fastening band 117.
Similarly to the end 106a of the tubular flexible body 106 described above, the end 106b and the tube 3 can be fixed using a band and an adhesive together.

In the compression device 108, the bolts 112a, 11
2b are screwed into the nuts 113a, 113b, so that the bolts 112a, 112b
10 is moved in the direction of the flange 109, and the band-shaped waterproof material 107 is compressed in the axial direction of the tubular body 105;
The band-shaped water blocking material 107 swells in the direction of the drilling surface 2a of the manhole 2 and is in close contact with the drilling surface 2a.

FIGS. 18 to 21 show a manhole structure 131 according to an example of the present invention, in which a watertight flexible joint 124 for a manhole of another example is inserted into a hole of a manhole and set. It is shown.

The manhole structure 131 according to an example of the present invention
The manhole structure is a manhole structure in which a concrete manhole 2 and a pipe 3 are connected by a watertight flexible joint 124 for a manhole.
The cylindrical body 125 is shortened in the manhole inner direction,
A guide 111a or the like having an L-shaped cross section is fixed to an end of the cylindrical body 125 in the manhole inside direction, and a nut 113a or the like is fixed to a vertical portion 115a or the like of the guide 111a or the like.

The watertight flexible joint 124 for the manhole comprises a rigid tubular body 125, a tubular flexible body 106 inside the tubular body 125, and a belt-like waterproof material 107 outside the tubular body 125.
And a compression tool 128.

The compression tool 128 includes a flange 109, a slide ring 110, and guides 111a and 111 having an L-shaped cross section.
b, 111c, 111d, bolts 112a, 112b,
112c, 112d and nuts 113a, 113b, 1
13c and 113d, respectively.

The flange 109 is provided on the outer surface of the cylindrical body 125 and has guides 111a, 111b, 111c,
111d horizontal parts 114a, 114b, 114c, 11
4d is fixed to the cylindrical body 125, and the nut 113
a, 113b, 113c, 113d are guides 111a,
Vertical portions 115a, 11b of 111b, 111c, 111d
5b, 115c, and 115d, respectively.
Between the flange 109 and the slide ring 110, a belt-shaped water blocking material 107 is provided.

The tubular flexible body 106 is made of rubber, and the belt-shaped water blocking material 107 is made of a low modulus elastomer.

One end 106a of the tubular flexible body 106 is fixed to the inner surface of the tubular body 125 by crimping by an expansion band 116, and the other end 106b of the tubular flexible body 106 is connected to the pipe 3 by a fastening band 117. It is clamped and fixed to the outer circumference. Since the tubular flexible body 106 has a tubular shape, the tubular flexible body 106 surrounds the tube 3 from the periphery.

The cylindrical body 125 and the pipe 3 are connected to the cylindrical flexible body 10.
The connection at 6 secures a space between the tubular body 125 and the pipe 3, and can absorb expansion / contraction displacement, bending displacement, shear displacement, and the like of the sewer pipe without applying a load to the sewer pipe.

[0138] The extension band 116 is
Is fixed inside the cylindrical body 125. Extension band 116
Is a cylindrical flexible body 1 whose circumference extends and expands radially.
06 is pressed against the inside of the cylindrical body 125. Cylindrical flexible body 10 with extension band 116
The attachment of the end 106a of No. 6 to the inside of the cylindrical body 125 is as follows.
An appropriate adhesive may be selected and fixed.

The other end 106b of the tubular flexible body 106 serves as a tube-side mounting portion, and is fixed by tightening from the outside of the tube 3 using a fastening band 117.
Similarly to the end 106a of the tubular flexible body 106 described above, the end 106b and the tube 3 can be fixed using a band and an adhesive together.

In the compression tool 108, the bolts 112a and the like are tightened into the nuts 113a and the like.
12a and the like move the slide ring 110 in the direction of the flange 109.
The belt-shaped water blocking material 107 swells in the direction of the drilling surface 2a of the manhole 2 and is in close contact with the drilling surface 2a.

FIG. 18 shows a watertight flexible joint 1 for a manhole.
It is a figure which shows the state of the vicinity of the band-shaped waterproof material 107 formed from the low modulus elastomer when the bolt is tightened after 24 is inserted. The band-shaped waterproof material 107 compressed in the pipe axis direction is extruded in a direction perpendicular to the pipe axis, and is brought into close contact with the outer periphery of the cylindrical body 125 and the drilling surface 2 a of the manhole 2, and at the same time, a surface pressure is applied. Is fixed to the hole of the manhole 2.

FIG. 22 is a perspective view of the watertight flexible joint for manhole of one example of the present invention used in the manhole structure shown in FIGS.

As shown in FIG. 22, a watertight flexible joint 124 for a manhole according to still another embodiment of the present invention is shown in FIGS.
It is used to connect a concrete manhole 2 and a pipe 3 as shown in FIG.

The watertight flexible joint 124 for the manhole includes a rigid tubular body 125, a tubular flexible body 106 inside the tubular body 125, and a belt-like waterproof material 107 outside the tubular body 125.
And a compression tool 128.

The compression tool 128 includes a flange 109, a slide ring 110, an L-shaped cross section guide 111a, a bolt 112a, etc., and a nut 11 shown in FIGS.
3a and the like.

As shown in FIGS. 18 to 20 and 22, the flange 109 is provided on the outer surface of the cylindrical body 125.
A horizontal portion 114a such as a guide 111a is fixed to the cylindrical body 125, a nut 113a is fixed to a vertical portion 115a such as the guide 111a, and a flange 109 is formed.
A belt-shaped water blocking material 107 is provided between the slide ring 110 and the slide ring 110.

In the watertight flexible joint 124 for a manhole,
One end 106a of the tubular flexible body 106 is
Thus, it is press-fitted and fixed to the inner surface of the cylindrical body 125.

In FIGS. 18 to 22, the watertight flexible joint 124 for manholes is provided with four L-shaped cross-section guides in the upper, lower, left and right directions. Guides can be provided, and the number of bolts and nuts can be increased.

In the present invention, as shown in FIG. 23, the watertight flexible joint 124 for a manhole is connected to the manhole 2 as shown in FIG.
And can be used to connect the manhole 2 and the pipe 3.

In this case, first, the watertight flexible joint 124 for the manhole is inserted into the hole 2 b of the manhole 2. The outer diameter of the watertight flexible joint 124 for manholes is
There is no problem if it is smaller than the size of the hole 2b.

As shown in FIG. 23, a manhole flexible joint 124 may be inserted from the inside of the manhole 2 or a manhole flexible joint may be inserted from the outside of the manhole (not shown). .

FIG. 23 shows that after the pipe 3 such as a sewer is laid between the shafts by the propulsion method, the watertight flexible joint 124 for a manhole of the present invention is drilled from the inside of the manhole 2 into the drilled surface of the manhole 2. It is a figure which shows that it inserts in the clearance gap between 2a and the pipe 3.

In this case, the watertight flexible joint 1 for manholes
Tightening the bolts 112a and the like 24 into the nuts 113a and the like,
0 in the direction of the flange 109, and
7 is compressed in the axial direction of the cylindrical body 125, and the
Can be bulged in the direction of the drilling surface 2a of the manhole 2 so that the band-shaped waterproof material 107 can be brought into close contact with the drilling surface 2a.

In the watertight flexible joint 124 for a manhole,
After inserting the watertight flexible joint 124 for the manhole into the drilled portion 2b of the manhole 2, the bolts 112a on the upper, lower, left and right sides can be evenly tightened.

By tightening the bolts 112a and the like, the slide ring 110 can be moved to the outside of the manhole 2, and the belt-like water stop between the flange 109 fixed to the outer periphery of the cylindrical body 125 and the slide ring 110 is formed. The material 107 is compressed in the pipe axis direction by the movement of the slide ring 110, but has no escape.

Therefore, in the obtained manhole structure,
Band-shaped waterproof material 107, outer periphery of cylindrical body 125 and manhole 2
When the gap between the hole 2a and the hole 2a is filled and tightened continuously, surface pressure is generated between the outer peripheral surface of the cylindrical body 125 and the hole 2a of the manhole 2 to stop water.

[0157] The other end 106b of the tubular flexible body 106 is fastened to the outer periphery of the pipe 3 by a fastening band 117 so as to be fixed by pressure bonding.

In the present invention, as shown in FIGS. 18 to 21, the length of the vertical portion of the L-shaped guide attached to the inside of the manhole of the cylindrical body is such that it protrudes from the wall surface of the manhole. By inserting the water-stopping flexible joint for manholes into the drilled portion of the manhole until the water strikes the inner wall of the manhole, the water-stopping flexible joint for manholes can be set at a predetermined position. This guide also prevents the watertight flexible joint for manholes of the present invention from coming off due to the pull-out force during an earthquake.

In the present invention, as shown in FIGS. 20, 24 to 36, the flange 1 of the watertight flexible joint 124 for a manhole is used.
09 can be provided with stoppers 118a and 118b on the outer surface.

The stoppers 118a and 118b include pipes 119a and 119b and steel rods 120a and 120b longer than the pipes 119a and 119b. The pipes 119a and 119b are fixed to the outer surface of the flange 109. The pipes 119a and 119b are arranged in a vertical direction when the manhole structure 131 is viewed in a longitudinal section.

In the pipes 119a and 119b, there is a rod 1
20a and 120b are inserted and the rods 120a and 12b
At the upper end of Ob, the stoppers 121a and 121b having outer diameters larger than the inner diameters of the pipes 119a and 119b are provided.

[0162] The stoppers 118a and 118b are
When the watertight flexible joint for manhole 124 is inserted into the drilled hole of the manhole 2, the watertight flexible joint for manhole 1
The rod 120a and the like are placed in the pipe 119a and the like so as not to increase the outer diameter of the pipe 24.

FIG. 24 shows a watertight flexible joint 1 for a manhole.
FIG. 4 is a diagram illustrating a state in which the hole 24 is being inserted into the hole of the manhole 2 as viewed from the outside of the manhole 2.

In FIG. 24, pipes 119a and 119b are provided outside the flange 109 fixed to the cylindrical body 125.
Is fixed, and round bars or the like smaller than the pipe inner diameter can be used for the rods 120a and 120b inserted into the pipe 115. Although the upper end of the round steel is provided with a stopper, it may be provided at the lower end, that is, at both ends.

When the watertight flexible joint 124 for the manhole is completely inserted into the hole of the manhole 2, the rods 120a, 1
The lower ends 122a and 122b of 20b project on the outer wall surface of the manhole 2.

FIG. 25 is a diagram showing this state. The rods 120a and 120b of the stoppers 118a and 118b drop when the flange 109 fixed to the tubular body 125 passes through the outer wall of the manhole 2 and is caught on the outer wall of the manhole 2 to serve as a stopper. FIG. 25 is a side view showing this state.

In the present invention, the wall of the manhole is sandwiched between the stopper and the protrusion of the L-shaped guide,
It can withstand withdrawal of the watertight flexible joint for manholes due to the withdrawal of the pipe during an earthquake, and the pushing in of the flexible watertight joint for manholes due to external water pressure.

In the present invention, a tubular flexible body 126 as shown in FIG. 27 can be used. One end 126a of the tubular flexible body 126 attached to the tubular body 125 is bent in a direction opposite to the pipe 3 to be fixed in a folded structure, and the other portions are fixed to the tubular flexible body 106.
Is fixed to the pipe 3 in the same manner as in the above. Such a manhole structure 141 is advantageous because it easily absorbs displacement in shape.

Further, in the present invention, the manhole structure 151 can be constructed by using the watertight flexible joint 134 for manhole as shown in FIG. The watertight flexible joint 134 for manholes is the watertight flexible joint 12 for manholes.
Unlike FIG. 4, it has a slide ring 140, a band-shaped waterproof material 137 formed of a low modulus elastomer, and a flange 139.

In the waterhole flexible joint 134 for manholes,
The slide ring 140, the band-shaped waterproof material 137, and the flange 139 are formed in accordance with the arc of the manhole 2.

Further, in such a manhole structure 151,
The end 106a of the tubular flexible body 106 is extended
When crimping and fixing to the cylindrical body 125 with
6c can be freely extended outside the manhole 2 within the range of the cylindrical body 125.

[0172]

According to the present invention, it is possible to prevent unevenness of the manhole drilling surface, water leakage due to the curved surface of the manhole drilling and errors. Further, according to the present invention, it is not necessary to attach the manhole in advance in the manhole drilling portion as in the conventional flexible joint, and even after completion of the laying of the sewer pipe as in the propulsion method, the connection structure between the manhole and the pipe is constructed. It is possible.

[Brief description of the drawings]

FIG. 1 is a side view of a manhole structure according to an example of the present invention.

FIG. 2 is a front view of the manhole structure of FIG.

FIG. 3 is a longitudinal sectional view of the manhole structure of FIG.

FIG. 4 is a horizontal sectional view of the manhole structure of FIG. 1;

FIG. 5 is a partial cross-sectional view of an example of a watertight flexible joint for manholes.

FIG. 6A is a side view of an example of a tubular flexible body, and FIG. 6B is a front view of the tubular flexible body of FIG.

FIG. 7A is a side view of an example of a cylindrical body,
(B) is a front view of the cylindrical body of (a).

FIG. 8 is a longitudinal sectional view showing a state after backfilling of the manhole structure.

FIG. 9 is a vertical cross-sectional view showing a state in which extraction displacement has occurred in the pipe.

FIG. 10 is a side view of a manhole structure according to another example of the present invention.

11 is a longitudinal sectional view of the manhole structure of FIG.

FIG. 12A is a side view of a cylindrical body of another example according to the present invention, and FIG. 12B is a front view of the cylindrical body of FIG.

13 is a longitudinal sectional view of the manhole structure of FIG. 11 as viewed from the inside of the manhole.

FIG. 14 is a longitudinal sectional view of a manhole structure according to still another example of the present invention.

FIG. 15 is a cross-sectional view of the manhole structure of FIG.

FIG. 16A is a longitudinal sectional view of an example of the push cushion rubber, and FIG. 16B is a front view of the push cushion rubber of FIG.

FIG. 17 is a longitudinal sectional view of a manhole structure according to an example of the present invention.

FIG. 18 is a longitudinal sectional view of a manhole structure according to another example of the present invention.

FIG. 19 is an enlarged longitudinal sectional view of a part of the manhole structure of FIG. 18;

20 is a cross-sectional view of the manhole structure of FIG.

FIG. 21 is a front view of the joint portion of the manhole structure of FIG. 18 as viewed from the inside.

FIG. 22 is a perspective view of the water stopping flexible joint for manholes of FIGS.

FIG. 23 is a cross-sectional view showing a construction example of the manhole structure of the present invention.

FIG. 24 is a back view of a water stop flexible joint for manholes during construction.

FIG. 25 is a rear view of the watertight flexible joint for manholes after construction.

26 is a side view of the water stopping flexible joint for manholes of FIG. 25. FIG.

FIG. 27 is a longitudinal sectional view of a manhole structure according to still another example of the present invention.

FIG. 28 is a cross-sectional view of a manhole structure according to still another example of the present invention.

FIG. 29 is a longitudinal sectional view of a conventional manhole connection structure.

FIG. 30 is a sectional view of another conventional manhole connection structure.

FIG. 31 is a sectional view of a manhole connection structure in buried soil.

FIG. 32 is a longitudinal sectional view showing a crimped state between a drilled surface of a manhole and a rubber flexible portion.

FIG. 33 is a longitudinal sectional view of a conventional manhole structure.

FIG. 34 is a cross-sectional view of the manhole structure of FIG.

[Explanation of symbols]

1,21,41,101,131,141,151 Manhole structure 2 Manhole 3 Tube 4,24,44,104,124,134 Waterproof flexible joint for manhole 5,25,45,105,125 Cylindrical body 6 , 26, 46, 106, 126 tubular flexible body 6a one end 6b other end 6c bellows 7 fixing band 8 fastening band 9,49 mortar 10,50 seal ring 11 backup material 12,32,52 decorative mortar 13, 23 Flange 14 Stopper 15 Band fastening window 16 Buried soil 37, 57 Waterproof layer 38 Sealing material 39 Support rubber 49 Waterproof mortar 60 Push-in buffer rubber 60a Projection 107, 137 Band-like waterproof material 108, 128 Compressor 109, 139 Flange 110, 140 Slide ring 111a, 111b, 111c, 1 11d Guide 112a, 112b, 112c, 112d Bolt 113a, 113b, 113c, 113d Nut 114a, 114b, 114c, 114d Horizontal part 115a, 115b, 115c, 115d Vertical part 106a, 126a, 162a One end 116, 163, 172 Expansion band 106b , 162b The other end 117, 164 Fastening band 2a Drilled surface 118a, 118b Prevention tool 119a, 119b Pipe 120a, 120b Rod 121a, 121b Detachment prevention part 122a, 122b Lower end 161 Manhole connection structure 162 Rubber flexible part 171 Rubber Flexible joint 201 Flexible joint 202 Rigid collar 203 Fixed band 204 Fastening band 205 Drill hole 206 Mortar 207 Buried soil

Continuing from the front page (72) Inventor Shuichi Suzuki 5351 Minamioka, Hinokawa-cho, Fukuyama City, Hiroshima Pref. ) Inventor Kozo Fujii 5351 Minamioka, Minoshima-cho, Fukuyama-shi, Hiroshima F-term within Hayakawa Rubber Co., Ltd. 2D047 BA27

Claims (16)

[Claims] 1. A manhole structure wherein a concrete manhole and a pipe are connected by a manhole waterproof joint, wherein the manhole waterproof joint is a rigid tubular body,
A tubular flexible body inside the tubular body, wherein the tubular flexible body is formed of an elastic body, and one end of the tubular flexible body is provided on an inner surface of the tubular body. A manhole structure which is crimped and fixed, and wherein the other end of the tubular flexible body is crimped and fixed to the outer periphery of the tube. 2. The manhole structure according to claim 1, wherein the tubular body has a flange, and the flange is in contact with an outer wall of the manhole. 3. A water-stopping material is provided between at least one of the cylindrical body and the wall of the manhole and between at least one of the flange and the wall of the manhole. Item 4. The manhole structure according to any one of Items 1 to 3. 4. The tubular flexible body has a bellows portion, and the bellows portion is accommodated in a space between the tubular body and the pipe. 4. The manhole structure according to any one of 3. 5. The manhole according to claim 4, wherein, when the bellows portion is extended due to the displacement of the tube, the bellows portion is accommodated in a space between the tubular body and the tube. Construction. 6. A seal ring is provided between the cylindrical body and the pipe so as to prevent earth and sand from flowing in from the outside of the manhole structure.
The manhole structure according to any one of the above. 7. The manhole according to claim 1, wherein a support rubber for supporting an end of the tube is provided between the cylindrical body and the tube. Construction. 8. A push cushion rubber is provided between said tubular body and said pipe, for buffering a push displacement of said pipe into said manhole structure. The manhole structure according to any one of the above. 9. The watertight flexible joint for manholes includes a band-shaped waterstop material outside the tubular body, and a compression tool, wherein the compression tool includes a flange, a slide ring, a bolt, and a nut. Wherein the flange is provided on the outer surface of the tubular body, the nut is fixed to the outer surface of the tubular body, and the band-shaped waterproof material is provided between the flange and the slide ring. Wherein the band-shaped waterproof material is formed of a low modulus elastomer, and the bolt moves the slide ring in the direction of the flange by tightening the bolt into the nut, and The water blocking material is compressed in the axial direction of the cylindrical body, and the band-shaped water blocking material swells in the direction of the drilling surface of the manhole and is in close contact with the drilling surface. Item 1 9. The manhole structure according to any one of items 8 to 8. 10. A watertight flexible joint for manholes used for connecting a concrete manhole and a pipe, wherein the flexible watertight joint for manholes comprises: a rigid tubular body;
A tubular flexible body inside the tubular body, wherein the tubular flexible body is formed of an elastic body, and one end of the tubular flexible body is pressed against an inner surface of the tubular body. A watertight flexible joint for manholes, wherein the other end of the tubular flexible body is fixed to the outer periphery of the pipe by pressure bonding. 11. The watertight flexible joint for manholes,
A belt-shaped water blocking material outside the cylindrical body, and a compression tool, the compression tool includes a flange, a slide ring, a bolt and a nut, and the flange is provided on an outer surface of the cylindrical body. Wherein the nut is fixed to the outer surface of the cylindrical body, and the band-shaped water stopping material is provided between the flange and the slide ring, and the band-shaped water stopping material is a low modulus elastomer. When the watertight flexible joint for manholes is inserted into a drilled portion of the manhole, the bolts move the slide ring in the direction of the flange by tightening the bolts in the nuts. The band-shaped water blocking material is compressed in the axial direction of the tubular body, and the band-shaped water blocking material swells in the direction of the drilling surface of the manhole and closely adheres to the drilling surface. Manhole for waterproofing friendly shaken joint to claim 10. 12. The watertight flexible joint for manholes according to claim 11, wherein the slide ring has a convex portion on a surface in contact with the band-like waterstop material. 13. A guide having an L-shaped cross section is fixed to said cylindrical body, and a vertical portion of said guide has a length protruding above a wall surface of said manhole. 13. The water-stopping flexible joint for manhole according to 11 or 12. 14. A stopper is provided on an outer surface of the flange, wherein the stopper includes a pipe and a steel rod having a length longer than the pipe, wherein the pipe is connected to the flange. The pipe is arranged in a vertical direction when the manhole structure is viewed in a longitudinal section, the rod is inserted into the pipe, and the upper end of the rod is The pipe has a slip-off preventing portion having an outer diameter larger than the inner diameter of the pipe. The watertight flexible joint for manholes according to any one of claims 11 to 13, which protrudes. 15. In obtaining a manhole structure in which a concrete manhole and a pipe are connected by a manhole waterproof joint, the manhole waterproof joint is a rigid cylindrical body,
A tubular flexible body inside the tubular body, wherein the tubular flexible body is formed of an elastic body, and one end of the tubular flexible body is pressed against an inner surface of the tubular body. A fixed manhole, wherein the watertight flexible joint for manhole is inserted into a drilled portion of the manhole, and the other end of the cylindrical flexible body is fastened to an outer periphery of the pipe by pressure bonding. Construction method of the structure. 16. The watertight flexible joint for manholes,
A belt-shaped water stopping material outside the cylindrical body, and a compression tool, the compression tool includes a flange, a slide ring, a bolt and a nut, and the flange is provided on an outer surface of the cylindrical body. Wherein the nut is fixed to the outer surface of the tubular body, and the band-like water stopping material is provided between the flange and the slide ring, and the band-like water stopping material is a low modulus elastomer. The bolt is fastened to the nut, the slide ring is moved by the bolt in the direction of the flange, the band-shaped water blocking material is compressed in the axial direction of the tubular body,
The method for constructing a manhole structure according to claim 15, wherein the band-shaped waterproof material is swelled in the direction of the drilled surface of the manhole, and the belt-shaped waterproof material is adhered to the drilled surface.