JP2906394B2 - Fume pipe joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a medium / large-diameter fume pipe (inner diameter 500 mm to 3000 mm) and a manhole (assembly hole and cast-in hole) (inner diameter 900 to 3000 mm).

[0002]

2. Description of the Related Art In January of last year, the Hyogoken Nanbu Earthquake, which caused unprecedented damage mainly in Kobe City, also damaged sewage treatment plants and pumping stations. , Equipment and piping were damaged or broken.
The sewer sewers also suffered damage such as damage to manholes and pipes, meandering pipes and detached joints. In addition, even in normal construction, damage to the joint due to the ground and the construction method is a problem. By the way, the following structure can be cited as a connection between a medium- and large-diameter fume tube and a manhole that is currently performed. (1) Insert the fume tube 1 'into the connection hole (drilled hole) 9' of the manhole 2 ', and fill and fix the mortar 10' between them. (See Fig. 5) (2) Insert a fume tube fitted with a rubber ring into the connection hole (drilled hole) of the manhole, and fill and fix mortar between both. In both cases (1) and (2), the side end of the fume tube inserted into the connection hole of the manhole is formed in an arc shape so as to be flush with the inner side surface of the manhole.

[0003]

The conventional connection structure described above has no seismic resistance in the case of (1), and cannot prevent the problems such as damage due to the earthquake and disconnection of the joint as described above. Absent. In the case of (2), some vibration is absorbed by the rubber ring between the fume tube and the manhole, but it responds to pipeline fluctuation (vertical movement, axial expansion and contraction) due to the earthquake. I can't do that. Some small-diameter fume tubes with an inner diameter of up to 450 mm are partially compatible, but there is no one that can be used for each size from a medium diameter to a large diameter from 500 mm to 3000 mm.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a joint structure between a medium- and large-diameter fume pipe and a manhole that is excellent in seismic resistance against pipeline fluctuations (vertical movement, axial expansion and contraction) due to an earthquake without impairing water tightness.

[0005]

In order to achieve the above object, the present invention provides a technical means, a metal sleeve for connecting and fixing via a mortar into a connection hole formed in a lower peripheral wall of a manhole; It consists of an anti-seismic rubber ring fitted around the outer periphery of the connection part of the large-diameter fume pipe, and a plurality of circumferentially divided fixing bands that are fastened and fixed to the outside of the anti-seismic rubber ring. The diameter of the fume tube is the same as the inner diameter of the fume tube, and the open end side of the fixing band is bolted to the tip of a protruding portion of the metal sleeve protruding outward from the peripheral wall of the manhole. The medium / large-diameter fume tube referred to in the present invention has an inner diameter of 500 mm.
From about to 3000mm.

[0006] The end of the metal sleeve inserted into the connection hole of the manhole and fixed with resin mortar on the inner surface side of the manhole is formed in an arc shape so as to be flush with the inner surface of the manhole. The anti-seismic rubber ring fitted around the connection part of the medium / large diameter fume pipe may be a single ring having the same length as the insertion length of the medium / large diameter fume pipe with respect to the fixed band. In consideration of economy and the like, a narrow ring covering the above-mentioned length with a plurality of, for example, three or four, may be used. Although the earthquake-resistant rubber ring may be a solid body, by providing a hollow portion in the wall thickness, it is possible to cope with larger fluctuations.

[0007] Further, the fixing band divided into a plurality of parts in the circumferential direction for fastening and fixing to the outside of the above-mentioned seismic rubber ring can be divided into two parts, three parts, and the like. At least one ring member of the plurality of divisions may be connected and fixed in advance to the metal sleeve described above. In that case,
The ring member to be fixed is attached to the lower side of the outer periphery of the metal sleeve, so that a medium-sized or large-diameter fume tube in which an anti-seismic rubber ring is fitted to the fixed ring member can be mounted from above.

According to the above means, the middle / large diameter fume tube is integrated with the manhole via the metal sleeve and the fixing band, and the medium / large diameter fume tube is connected to the fixing band via the earthquake-resistant rubber ring. Therefore, fluctuations in the pipeline are absorbed by the rubber.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state in which a medium / large diameter fume pipe is connected to a manhole via a joint. In the drawing, reference numeral 1 denotes a medium / large diameter fume pipe, and 2 denotes a manhole. And the manhole 2 are connected by a joint A. The joint A includes a metal sleeve 3, a plurality of fixed bands 4 bolted to one side of the metal sleeve 3, and an outer periphery of the medium / large diameter fume tube 1 located inside the fixed band. And the inner diameter of the metal sleeve 3 is the same as the inner diameter of the medium / large-diameter fume tube 1, and a step is formed at the connection between the metal sleeve 3 and the medium / large-diameter fume tube 1. Does not occur. A side 3a of the metal sleeve 3 to be inserted into the connection hole 9 formed in the manhole 2 is formed in an arc shape so as to be flush with the inner surface of the manhole 2, and a protruding portion 3b protruding outward from the manhole 2. A fixing portion 4c for the fixing band 4 is formed on one end of the fixing band 4, and a screw hole in which the fixing band 4 is bolted 6 is formed in the mounting portion 3c.

A fixing band 4 bolted to the metal sleeve 3 is connected to a medium / large diameter fume tube 1 to be connected.
An arc-shaped three member 4-1 and 4- having a fume pipe fastening portion 4a having a diameter larger than the outer diameter of the metal sleeve 3 and a fixing portion 4b having an inner diameter substantially the same as the outer diameter of the metal sleeve 3 described above. 2, 4-3. One of the members 4-1 has a fixing portion 4b completely fixed to the mounting portion 3c of the metal sleeve 3 by bolting, and the other two members 4-2. , 4-3 mount the medium- and large-diameter fume tube 1 fitted with the anti-seismic rubber ring 5 on the fixed band member 4-1 fixed to the metal sleeve 3, and then cover the outer periphery thereof with each other. Are fastened to the metal sleeve 3 at the same time as the connection is tightened. The bolt holes in the fixing band members 4-2 and 4-3 for fixing the medium / large-diameter fume tube 1 after setting it on the metal sleeve 3 are made to be long holes. After the movement is adjusted in the direction, it can be fixed.

As shown in FIG. 4, the anti-seismic rubber ring 5 fitted on the outer periphery of the connecting portion of the medium / large diameter fume tube 1 has an inner surface (a surface which comes into contact with the outer surface of the medium / large diameter fume tube) having minute irregularities. The outer surface is formed as a mountain-shaped uneven surface, and a space 5a is formed in the thickness so as to cope with a larger variation. A plurality (three in the drawing) of the anti-seismic rubber ring 5 is fitted around the connection portion of the middle / large diameter fume pipe 1. Further, between the bottom of the fixed band 4 where the end faces of the medium and large diameter fume pipes face each other and the end face of the mounting portion 3c of the metal sleeve 3, a cushion rubber 8 made of a hard rubber sponge or the like is provided. Is attached.

Next, the procedure for installing the above-described joint will be described. (1) First, a predetermined number (three) of seismic rubber rings 5 are fitted one by one from the end face of the medium / large diameter fume tube 1 one by one. Then, the lubricant is applied to the three members 4-1, 4-2, and 4-3 forming the earthquake-resistant rubber ring 5 and the fixing band 4. At this time, a lubricant is also applied to bolts used for tightening the three members. (2) The metal sleeve 3 is put into the manhole 2 and is aligned with the connection hole (drilled hole) 9 formed in the peripheral wall of the manhole 2 and drawn toward the medium / large diameter fume pipe 1 to be connected. At this time, the curve inside the manhole 2 and the curve at the side end of the insertion side 3a of the metal sleeve 3 are matched. (3) One of the three members 4-1 constituting the fixing band 4 is completely fixed to the mounting portion 3c of the metal sleeve 3 by the bolt 6. (4) The metal sleeve 3 is rotated so that the completely fixed band member 4-1 is located below the medium / large diameter fume tube 1. (5) Align the fixing portions 4b of the remaining two members 4-2, 4-3 of the fixing band 4 with the mounting portions 3c of the metal sleeve 3, and attach the band members 4-2, 4-3 to the metal sleeve 3. Temporarily fix with bolts. (6) The three band members 4-1, 4-2, and 4-3 are gradually tightened with the bolts and nuts 11 with the water-swellable sealing material interposed therebetween.
At this time, do not overtighten one place and evenly tighten three places. The metal sleeve 3 is connected and integrated by filling the connection hole 9 of the manhole with the resin mortar 10.

With the above configuration, the medium / large diameter fume tube 1
Is integrated with the manhole 2 at the joint A, and the fluctuation of the pipeline is absorbed by the earthquake-resistant rubber ring 5. Since the inner diameter of the metal sleeve 3 is the same as the inner diameter of the medium / large fume tube 1, the diameter of the connection hole formed in the peripheral wall of the manhole is such that the conventional medium / large diameter fume tube 1 is directly connected to the manhole 2. The diameter may be smaller than the diameter of the connection hole (fume tube outer diameter + α) when the connection is made by inserting, thereby facilitating the drilling operation. Furthermore, if the conventional hole diameter is used, it is possible to connect a pipe one size larger. In addition, the drilling work may be the same diameter regardless of the pipe type and the pipe thickness, and the drilling work becomes easy. In addition, since the medium and large diameter fume pipes are joined to the metal sleeve, the end face of the fume pipe may be cut straight, which is easier than the conventional arc-shaped cutting work. Become.

[0014]

According to the joint structure of the present invention, the middle and large diameter fume tube is integrated with the manhole by a joint comprising a metal sleeve and a fixing band. Moreover, fluctuations in the pipeline (up and down movement,
Axial expansion and contraction) is absorbed by the rubber ring. Therefore,
It is possible to provide a joint excellent in earthquake resistance, which can surely prevent the fume pipe from coming off the manhole due to the earthquake. In addition, since the joint is a two-part type consisting of a metal sleeve and a plurality of fixed bands, it is possible to reduce the weight as compared with a joint having a single structure, and to save labor for the connection work. In addition, since the medium and large diameter fume pipes are joined to the metal sleeve, the end face of the fume pipe may be cut straight, which is easier than the conventional arc-shaped cutting work. Become.
Further, according to the configuration of the second aspect, the connection operation between the fume tube and the metal sleeve can be easily performed. Furthermore, according to the configuration of the third aspect, the metal sleeve is easy to manufacture without troublesome welding, and can provide an economical joint structure.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a fume tube and a manhole are connected by a joint according to the present invention.

FIG. 2 is an enlarged sectional view of a joint portion.

FIG. 3 is a longitudinal sectional view taken along line (3)-(3) of FIG. 2;

FIG. 4 is a sectional view showing an earthquake-resistant rubber ring.

FIG. 5 is a cross-sectional view showing a conventional connection structure between a fume tube and a manhole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Medium and large diameter fume tube 2 ... Large manhole 3 ... Metal sleeve 4 ... Fixed band 5 ... Seismic rubber ring A ... Joint

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16L 27/00-27/12 F16L 49/00 F16L 21/00-21/08

Claims (3)

(57) [Claims] 1. A joint structure between a middle / large-diameter fume pipe and a manhole, wherein the metal sleeve is connected and fixed via a mortar to a connection hole formed in a lower peripheral wall of the manhole;
It consists of an anti-seismic rubber ring fitted around the outer periphery of the connection part of the medium and large diameter fume pipe, and a plurality of circumferentially divided fixing bands that are fastened and fixed to the outside of the anti-seismic rubber ring. -The middle diameter and the large diameter, wherein the inner diameter of the fixing band is the same as the inner diameter of the large-diameter fume tube, and the open end side of the fixing band is bolted to the tip of a protruding portion protruding outward from the manhole peripheral wall of the metal sleeve. Fume pipe joint structure. 2. The fixed band is divided into three in the circumferential direction,
2. The joint structure for a medium / large diameter fume pipe according to claim 1, wherein one of the pipes is fixed in advance to a metal sleeve. 3. A metal sleeve in the joint structure, wherein a portion in direct contact with flowing water is made of a corrosion-resistant metal, and the other is made of another metal and connected and integrated by bolts and nuts. 3. The joint structure for a medium / large diameter fume pipe according to claim 1.