JP2005121057A - Balloon type duct passage opening and shutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To open and shut a duct passage by expanding a balloon. <P>SOLUTION: Two pieces of flanges 7 of a duct 2 are fastened with screws. Brackets 9 are installed on the periphery of the flanges at certain intervals, and bolts 10 facing are engaged with the brackets to an outward direction. A doughnut-shaped balloon 13 is stored between two flanges, and another balloon 16 is also stored inside the duct 2. In a drainpipe for blocking its stream, the bolts 10 are uniformly fastened, and the periphery of the flanges 7 is fixed on an inner wall of the drainpipe so as to expand the inner wall of the drainpipe 25. Then, both balloons are inflated with compressed air. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is an apparatus for closing or opening a flow path by installing it in a pipe such as a sewer pipe during construction.

  An apparatus for temporarily closing a sewer using a balloon is conventionally used in construction of a sewer pipe (see Patent Document 1 below). In this device, a donut-shaped balloon is fitted around a conduit, and when the balloon is inflated with compressed air in the sewer, the space between the sewer and the conduit is closed by the inflated balloon. It is tightened from around and held in the sewer pipe. In addition, another balloon is housed in the conduit, and when the air is inflated into the balloon, the interior of the conduit is closed and the flow of sewage can be stopped.

In such a conventional pipe opening / closing device, when the donut balloon is inflated, it comes into close contact with the inner wall of the sewage pipe to some extent, but the balloon expands in the axial direction (thickness direction) no matter how much air is pushed in after that. In other words, there is a drawback that the close contact force exerted on the inner wall of the sewer pipe does not increase and the switchgear is not stable.
Japanese Patent No. 2900022

  It is an object of the present invention to improve a conventional balloon-type pipeline opening / closing device so that the device itself can be firmly fixed in the pipeline.

  In the pipe line opening / closing device of the present invention, two scissors are supported around the conduit so as to be detachable with a space between each other. A donut-shaped balloon that closes the space between the conduit and the conduit is accommodated by press-fitting and expanding a fluid (gas or liquid) between the ridges. The conduit is provided with means for opening and closing the flow path therein.

  In this case, since the donut-shaped balloon is accommodated between the two ridges, the donut balloon is restrained by the two ridges when the fluid is press-fitted and inflated. Does not expand, only expands outward. Therefore, the balloon can exert a great pressure on the inner wall of the pipeline, which not only eliminates liquid leakage between the inner wall of the pipeline and the balloon, but also allows the opening / closing device itself to be firmly fixed in the pipeline. There is an effect that can be done.

  In addition, since the ridge is as large as the inner diameter of the pipe line, it should not be fixed to the conduit so that it can be removed. This facilitates storage and transportation to the construction site. Furthermore, it is preferable that the ridge is divided into several pieces in the circumferential direction, and the adjacent ones are connected with bolts (claim 2). In this way, a narrow place such as a manhole entrance can be passed, and it can be assembled in a manhole and installed in a pipeline.

  Preferably, a plurality of brackets are fixed at intervals along the periphery of the rod, screws are screwed outwardly to the brackets, and the bolts are tightened so that the tip is pressed against the inner wall of the pipeline. The peripheral edge portion may be held on the inner wall of the pipe (Claim 3). If it carries out like this, this apparatus can be reliably supported in a pipe line, and safety | security increases.

  The means for opening and closing the flow path in the conduit may be a valve device such as a butterfly valve, but as usual, it may be composed of a balloon that is accommodated in the conduit and expands and contracts by press-fitting and discharging fluid. (Claim 4).

  As shown in FIGS. 1 to 3, the pipe opening / closing device 1 welds a drum-shaped mounting base 3 with the center removed to the center of the conduit. Bolt holes 5 are formed at regular intervals on both end faces of the mounting base, and a cap nut is welded to the inner side of the mounting base 3 in accordance with the position of each bolt hole (FIG. 2).

  As shown in FIG. 1, the flanges 7 to be attached to both end faces of the mounting base are divided into two parts, and are tightened together with bolts 7d to be integrated. The bracket 9 is welded with a gap along the periphery of the flange 7, and a bolt is screwed outwardly to the nut 9a welded thereto. Since the inner surface of the sewer pipe is damaged when the tip of this bolt directly hits, a protective pad 11 is prepared. The protective pad 11 has a rubber plate 11a stretched on the outer surface of a metal box. Reference numeral 14 denotes a reinforcing material.

  The flange 7 configured in this manner is applied to the end surface of the mounting base 3, the bolt 12 is inserted into the bolt hole 7b drilled around the center hole 7a, and the tip thereof is screwed into the cap nut 6 inside the mounting base. Tighten. A donut-shaped balloon 13 is stored around the mounting base 3 (between the two scissors 7). This donut-shaped balloon is substantially the same as an automobile tire tube, and can be made of a rubber-based material. The air tube 13a of the balloon passes through the mounting base 3 and the flange 7 and pulls out (FIG. 2). Since the ridge 7 is divided into two, it is preferable that a protective sheet 15 such as a rubber plate is sandwiched between the ridge 7 so that the balloon 13 is not damaged at the joint 7c.

  Another balloon 16 (expanded like a bowl) is also stored inside the conduit 2. This balloon can also be made of the same material as the donut balloon. A metal air pipe 16 a extending from one end of the balloon 16 is supported by a bracket 17 fixed inside the conduit 2.

  FIG. 4 shows a state of repair work for the invert 21 at the bottom of the manhole 20. The work procedure is as follows. First, the manhole cover 22 is opened and the conduit 2 and the fence 7 are carried into the manhole 20. Put in.鍔 7 is divided into two so you can pass through the mouth of the manhole. The conduit 2 is elongate and passes through the mouth without problems. When carried in this way, as shown by a chain line in FIG. 4, the opening / closing device 1 is assembled on the assembly table 23 temporarily installed in the manhole.

  When the assembly is completed, the opening / closing device 1 is carried into the sewer pipe 25 as shown by a solid line in FIG. Next, the bolt 10 screwed to each bracket 9 is loosely tightened, and the pad 11 is sandwiched between the tip of the bolt and the inner surface of the sewer pipe. In this way, the bolts 10 are evenly tightened so that the inner wall of the sewage pipe 25 is pushed out, and the periphery of the trough 7 is fixed to the inner wall of the sewage pipe.

  Next, compressed air is sent from the compressor to the two balloons 13 and 16 to be expanded. The inner balloon 16 expands in a bowl shape and closes the inside of the conduit 2. The outer balloon 13 expands in a donut shape and closes between the conduit 2 and the sewer 25. The outer balloon 13 is inflated in the direction in which the diameter increases because both sides are sandwiched between the flanges 7. Therefore, the inflated balloon 13 is firmly attached to the inner surface of the sewer pipe 25, and the apparatus is held in a stable state.

  In this way, the sewage flowing into the manhole is blocked, and invert work can be performed in the manhole. As shown by a chain line in FIG. 4, if a hose 26 is connected to the end of the conduit 2 and the balloon 16 in the conduit 2 is contracted, the sewage can be discharged to another place through the hose.

It is an exploded perspective view of a pipe line opening and closing device. It is sectional drawing similarly. It is also a front view. The use condition of a pipe opening and closing device is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipeline switching device 2 Conduit 3 Mounting stand 7 ９ 9 Bracket 10 Bolt 13 Balloon 16 Balloon 25 Sewer pipe

Claims (4)

  A conduit and two reeds that are removably supported around the periphery of the conduit, and the conduit and the conduit by being press-fitted and expanded between the reeds and the reeds A balloon-type conduit opening / closing device comprising a donut-shaped balloon that closes the gap and means for opening / closing a flow path in the conduit.   The balloon-type pipeline opening / closing device according to claim 1, wherein the flange is divided into a plurality of parts in the circumferential direction, and the adjacent ones are connected to each other with bolts.   A plurality of brackets are fixed at intervals along the periphery of the flange, and bolts are screwed outwardly to the brackets, and the bolts are tightened so that the tip is pressed against the inner wall of the pipe. The balloon-type pipeline opening / closing device according to claim 1 or 2, wherein the portion is held on the inner wall of the pipeline.   4. A balloon-type pipeline opening / closing device according to claim 1, 2 or 3, wherein the means for opening and closing the flow path in the conduit comprises a balloon which is accommodated in the conduit and expands and contracts by press-fitting and discharging a fluid. apparatus.

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