JP3288891B2 - Waterproof flexible joint for manhole and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint, and particularly to a manhole suitable for use in a joint between a concrete manhole (hereinafter abbreviated as a manhole) and a sewer pipe (hereinafter abbreviated as a pipe). The present invention relates to a water stoppable flexible joint and a method of constructing the same.

[0002]

2. Description of the Related Art Conventionally, in order to connect a manhole to a pipe, a hole larger than the outer diameter of the pipe to be used is previously drilled in the outer wall of the manhole, and after the pipe is attached to this hole, mortar or concrete is driven into the hole. The gap between the manhole and the pipe was eliminated. However, in the method of driving mortar or concrete, there is a problem that the joint is not flexible, the pipe may be broken due to non-sinking, and water may be leaked, and a repair cost is required. In addition, backfill cannot be performed until the mortar or concrete is hardened, and when concrete is driven in, there is also a problem that a work requiring skill such as a formwork assembling work has to be performed.

As a watertight joint for manholes which solves these problems, the present applicant has disclosed in Japanese Utility Model Publication No. 4-29190, as shown in FIGS.
A cylindrical portion 42 that is coaxially inserted into an end of a tube (not shown).
And a manhole waterproof joint 41 comprising: a protrusion 43 protruding in two axial directions at one end of a cylindrical portion 42; and an edge 44 attached to the cylindrical portion 42 in a radial direction in a brim shape. I have.

As shown in FIG. 7, a watertight joint 41 for a manhole disclosed in Japanese Utility Model Publication No. 4-29190 described above has a hole 51a formed in an outer wall 51b of the manhole 51.
With the protruding portion 43 inserted therein, the edge portion 44 and the outer wall 51b of the manhole 51 are fixed with an adhesive 52, and the cylindrical portion 42 and the tube 42 are fixed with an adhesive layer 54 and a fastening band 55. . Thereafter, the pipe 53 is connected to the manhole 51 by providing a mortar 56 and the like between the protrusion 43 and the hole 51a. Thereby, the manhole 5
A good water stopping effect can be obtained at the connection between the pipe 1 and the pipe 53.

[0005]

In the watertight joint for manholes having the above-described structure, an adhesive 52 such as butyl rubber is used for joining the edge portion 44 to the outer wall surface of the manhole, and the adhesive is also applied to the outer wall surface of the manhole. A layer was formed, and the edge 44 provided with the pressure-sensitive adhesive 52 was stuck on the pressure-sensitive adhesive layer.

However, the construction site of the joint according to the present invention is underground formed by excavation of the ground, and the humidity is high. There was a problem that the pasting work became difficult.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a watertight flexible joint for manholes, which can follow the displacement even if the pipe is largely bent and can maintain good watertightness, and is easy to construct, and a construction method thereof.

[0008]

SUMMARY OF THE INVENTION A watertight flexible joint for a manhole according to the present invention is a flexible joint for a manhole which is applied to a joint portion between a manhole and a pipe, and is coaxially inserted into an end of the pipe. A cross section S having a cylindrical portion and a width protruding in the axial direction over the entire periphery of one end of the cylindrical portion, the outer peripheral cylindrical portion having a width not protruding from a drilled hole formed in the outer wall of the manhole.
A flexible portion, a waterproofing adhesive provided on the outer peripheral surface of the outer peripheral cylindrical portion of the flexible portion, and an expansion band for pressing the waterproofing adhesive to the drilled hole from inside the outer peripheral cylindrical portion. It is a feature.

Further, the method for installing a watertight flexible joint for manholes according to the present invention is the method for installing a watertight flexible joint for manholes described above, wherein the expansion band is expanded to stop the outer peripheral cylindrical portion. After pressing and fixing the inside of the drilled hole of the manhole via a water-based adhesive, the pipe is inserted into the cylindrical portion, and the portion of the water-blocking adhesive layer inside the cylindrical portion is tightened with a fastening band from the outside to be fixed by pressure bonding. It is characterized by the following.

[0010]

In the construction described above, the S-shaped flexible portion provided on the entire circumference of the cylindrical portion absorbs the displacement even if the pipe is bent so large that it cannot follow with the conventional watertight joint after construction, and By pressing the waterproofing adhesive part of the outer cylindrical part of the S-shaped flexible part with the expansion band from the inside, the adhesion between the inner side of the manhole drilled hole and the outer cylindrical part becomes strong, Can be enhanced.

In the construction method of the present invention, the watertight flexible joint for a manhole having the above-described configuration is used, and the space between the pipe and the cylindrical portion and the space between the manhole and the outer peripheral cylindrical portion are fixed by pressure bonding with an adhesive. Since it has a watertight structure, it can be easily constructed without using any mortar or the like. Therefore, there is no need for skilled work such as formwork assembly work,
In addition, it is not necessary to wait for the backfill until the effect of the mortar or concrete, the construction can be performed in a short time of about 20 minutes, and the backfill operation can be performed after the construction.

[0012]

FIG. 1 is a view showing the construction of an example of a watertight flexible joint for manholes according to the present invention. In the example shown in FIG.
The watertight flexible joint 1 for manholes comprises a cylindrical portion 2 for holding an end of a pipe (not shown), and a flexible portion 3 having an S-shaped cross section provided to protrude in the axial direction all around one end of the cylindrical portion 2. It is composed of The flexible portion 3 includes a bent portion 3a having an S-shaped cross section and an outer cylindrical portion 3b following the bent portion 3a. The outer cylindrical portion 3b has a width that does not protrude from a drilled hole formed in an outer wall of the manhole. It is configured as follows.

On the outer peripheral surface of the outer cylindrical portion 3b of the flexible portion 3, a water-blocking pressure-sensitive adhesive layer 4 of butyl rubber or the like is provided over the entire circumference, and although not visible in FIG. At a position corresponding to the water-blocking pressure-sensitive adhesive layer 4 on the surface, an extension band 5 for pressing the water-blocking pressure-sensitive adhesive layer 4 to the inside of a manhole hole at the time of construction is provided. In this law, the extension band 5 is provided with a plurality of slip prevention metal fittings 10 and is constructed so as to withstand water pressure from the inside by engaging the slip prevention metal fitting 10 with the inner wall surface of the manhole. . If the construction place is a place where there is no pressure from the inside, the shift prevention metal fitting 10 can be omitted.
Further, as in the conventional case, an adhesive layer 6 is provided on the inner surface of the end of the cylindrical portion 2 that holds the pipe, and a fastening band 7 is provided at a position corresponding to the adhesive layer 6 on the outer surface of the end of the cylindrical portion 2. Provided.

FIG. 2 is a view for explaining an example of a method for constructing a watertight flexible joint for manholes according to the present invention. In FIG. 2, first, the watertight flexible joint 1 for a manhole having the structure shown in FIG. 1 is inserted into a drilled hole 12 formed in the outer wall of the manhole 11 to a predetermined position and attached. If the extension band 5 has the slip-prevention metal fitting 10, the slip-prevention metal fitting 10 is engaged with the inner side surface of the manhole 11, and if the slip-prevention metal fitting 10 is absent, the state is unchanged.
By expanding the expansion band 5 using a predetermined expansion jig, the outer peripheral cylindrical portion 3b and the water-blocking pressure-sensitive adhesive layer 4 are pressed against the inner surface of the drilled hole 12 and the water-stopping flexible joint 1 for manhole is connected to the manhole 11. In the drilled hole 12. Thereafter, the extension jig is removed, the pipe 13 is inserted into the cylindrical portion 2, and the portion of the adhesive layer 6 of the cylindrical portion 2 is tightened from the outside with a fastening band 7 to be fixed by pressure bonding. The installation of the joint 1 is completed. In addition, 8 is a backup material provided as needed, and 9 is a decorative mortar also provided as needed.

FIG. 3 is a diagram showing an example of an extension band 5 in the watertight flexible joint for manholes of the present invention. FIGS. 4 and 5 show examples of an extension jig adapted to the extension band 5 shown in FIG. FIG. 3 is a diagram illustrating a configuration. First, the extension band 5 shown in FIG. 3 has a length in which both ends of one band overlap when attached, and an extension jig mounting portion 21 as a locking member is provided inside the both ends. It is composed. When the extension band 5 is expanded after the attachment, the overlapping both ends slide, and the stopper 22 is installed in a state where the outer peripheral cylindrical portion 3b and the water-blocking adhesive 4 are sufficiently pressed against the inner surface of the hole 12. It is fixed.

The extension jig 23 shown in FIG. 4 has a pair of U-shaped arms 24-1, 24-2 each having an open end.
Are rotatably connected by a hinge 25 at one end. At the center of both arm members 24-1 and 24-2,
A bar screw portion 25 and a push-spread portion 26 are provided to form an expanded portion. On the other ends of the arms 24-1 and 24-2, extension band attachment portions 27-1 and 27-2 with which the extension jig attachment portion 21 of the extension band 5 shown in FIG. ing. Therefore, by rotating the spread portion 26,
The interval between the extension band attachment portions 27-1 and 27-2 gradually widens, and the extension band 5 can be extended.

The extension jig 23 shown in FIG. 5A comprises a slide rail 32 having a rack 31 and a slide member 34 having a pinion 33. The pinion 33 rotates on the rack 31 so that the slide rail 32 is rotated. Band insertion plate 35-1 and the band insertion plate 35 of the slide member
The structure gradually widens between -2. For this reason, as shown in FIG. 5B, the band inserting plates 35-1 and 35-2 are engaged with the extension jig mounting portion 21 of the extension band 5 to set the extension jig 23, and When the pinion 33 is driven, the extension band 5 can be extended. 36 is a handle for driving the pinion 33, 37 is a stopper for controlling the movement of the pinion 33 in the reverse direction, and 38 is a slide rail stopper.

The material constituting the cylindrical portion 2 and the flexible portion 3 of the water-stopping flexible joint 1 for manholes of the present invention is not particularly limited as long as it has flexibility. Since it is often used, it is preferable to use natural rubber imparted with bacterial resistance. In addition, the pressure-sensitive adhesive layers 4 and 6
The material is not particularly limited, but butyl rubber having good adhesiveness and durability is preferably used.

[0019]

As is clear from the above description, according to the watertight flexible joint for manholes of the present invention, an S-shaped flexible portion is provided on the entire circumference of the cylindrical portion, so that the conventional shutoff after the construction is completed. By absorbing the displacement even if the pipe bends to the extent that it can not follow with the water joint, and by pressing the waterproofing adhesive part of the outer cylindrical part of the S-shaped flexible part with the expansion band from the inside,
The adhesion between the inside of the borehole of the manhole and the outer peripheral cylindrical portion is strengthened, and the waterproofness can be enhanced.

Further, according to the method for constructing a watertight flexible joint for manholes of the present invention, the watertight flexible joint for manholes having the above-described configuration is used, and the space between the pipe and the cylindrical portion and between the manhole and the outer peripheral cylindrical portion are used. Is press-fixed with an adhesive to form a watertight structure, so that it can be easily installed without using any mortar or the like. Therefore, there is no need for skilled work such as formwork assembly work, and there is no need to wait for backfilling until the effect of mortar and concrete, and construction can be performed in a short time of about 20 minutes, and Backfill work can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a watertight flexible joint for manholes of the present invention.

FIG. 2 is a view for explaining an example of a method for installing a watertight flexible joint for manholes according to the present invention.

FIG. 3 is a diagram showing a configuration of an example of an extension band used in the watertight flexible joint for manholes of the present invention.

FIG. 4 is a diagram showing a configuration of an example of an expansion jig used in the construction method of the present invention.

FIG. 5 is a view showing the configuration of another example of an expansion jig used in the construction method of the present invention.

FIG. 6 is a diagram showing a configuration of an example of a conventional manhole waterproof joint.

FIG. 7 is a view for explaining an example of a conventional method for constructing a watertight joint for manholes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof flexible joint for manholes 2 Cylindrical part 3 Flexible part 3a Bent part 3b Outer peripheral cylindrical part 4, 6 Adhesive layer 5 Expansion band 7 Fastening band 11 Manhole 12 Drilled hole 13 Pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 1/024 E02D 29/12 E03F 5/02 F16L 5/02 F16L 27/02

Claims (6)

(57) [Claims] 1. A manhole flexible joint applied to a joint portion between a manhole and a pipe, comprising: a cylindrical part coaxially inserted into an end of the pipe; A flexible portion having an S-shaped cross section whose outer peripheral cylindrical portion does not protrude from a drilled hole formed in the outer wall of the manhole; a water-blocking adhesive provided on an outer peripheral surface of the outer cylindrical portion of the flexible portion; A watertight flexible joint for manholes, comprising an expansion band for pressing an aqueous pressure-sensitive adhesive into the drilled hole from the inside of the outer peripheral cylindrical portion. 2. The extension band has locking portions at both inner end portions, and by expanding these locking portions, the outer peripheral cylindrical portion is fixed to the inside of the drilled hole via a water-blocking adhesive. The watertight flexible joint for manholes according to claim 1, which is structured. 3. The watertight flexible joint for manholes according to claim 1, wherein the extension band has a displacement preventing member. 4. The method for constructing a watertight flexible joint for a manhole according to claim 1, wherein the displacement preventing member is engaged with an inner wall surface of the manhole or in a state as it is. After the expansion band is expanded and the outer peripheral cylindrical portion is pressed and fixed inside the drilled hole of the manhole via the water-blocking adhesive, a pipe is inserted into the cylindrical portion, and the water-blocking adhesive inside the cylindrical portion is inserted. A method for constructing a watertight flexible joint for manholes, wherein a portion of the agent layer is tightened and fixed from outside by a fastening band. 5. When expanding the extension band, a pair of U-shaped arm members having both ends open are connected rotatably at one end by a hinge, and the arm member is pushed and expanded by the extension portion. 5. The method according to claim 4, wherein an expansion jig having a structure in which the other ends of the pair of arm members gradually widen is used. 6. The expansion band includes a slide rail having a rack and a slide member having a pinion, and the pinion rotates on the rack to insert the band insertion plate of the slide rail and the band of the slide member. 5. The method for constructing a watertight flexible joint for manholes according to claim 4, wherein an expansion jig having a structure in which a space between the plate and the plate gradually expands is used.