JP2005282587A - Removing device for anticorrosion sleeve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technique whereby an anticorrosion sleeve can be completely removed in the state of uninterruptive water without dropping into a pipe. <P>SOLUTION: This device is provided with a diameter enlarging cutter for a piping branch hole, and a center drill inserted into the anticorrosion sleeve prior to the diameter enlarging cutter and capable of removing the anticorrosion sleeve from the piping branch hole after the diameter is increased in the state of being inserted into the anticorrosion sleeve. The diameter enlarging cutter has the inside diameter larger than the outside diameter of an upper end enlarged diameter part of the anticorrosion sleeve, or the inside diameter whereby a lower end fitting claw of the anticorrosion sleeve can be cut. The center drill is provided with the outside diameter whereby tight insertion into the anticorrosion sleeve is possible or a fitting part elastically protruded and capable of being fitted to a lower end of the anticorrosion sleeve. Further, the center drill is provided with a reamer smaller than the inside diameter of the anticorrosion sleeve on a tip. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for removing an existing anticorrosion sleeve in a state of constant water in a diameter increasing work of a pipe branch portion of a water main pipe made of a metal pipe.

  For example, a corrosion prevention sleeve (also referred to as a rust prevention sleeve) as shown in, for example, Patent Document 1 is installed in a pipe branch portion of a water main pipe made of a metal pipe such as a cast iron pipe. In the diameter increase construction, a method of increasing the diameter of the branch portion and dropping the anticorrosion sleeve into the main pipe is performed.

JP 2001-304487

  According to the above construction method, although the anti-corrosion sleeve can be removed in a state of constant water, the anti-corrosion sleeve dropped in the main pipe becomes clogged and causes water discharge failure and rust, which is not preferable. However, the present condition is that there was no construction method that could remove the anticorrosion sleeve in the state of constant water other than the construction method.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a technique capable of completely removing the anticorrosion sleeve without dropping it into the pipe and in a state of constant water. It is to be.

  In order to achieve the above-described object, in the present invention, the diameter of the pipe branch hole is increased, and is inserted into the anticorrosion sleeve prior to the diameter increasing cutter, and after being increased in the state of being inserted into the anticorrosion sleeve. An anti-corrosion sleeve removal device was constructed from a center drill capable of pulling out the anti-corrosion sleeve from the pipe branch hole. This device is inserted into the branch pipe of the saddle water faucet attached to the water main pipe in a state of constant water, and the diameter of the branch hole is increased by the diameter increasing cutter with the center drill penetrated through the anticorrosion sleeve. Do. When the apparatus is removed after the diameter increase, the anticorrosion sleeve is pulled out together with the center drill.

  By the way, there are several types of anticorrosion sleeves. Therefore, in the case where the anticorrosion sleeve has an upper end enlarged diameter portion that engages with the opening surface of the pipe branch hole, the diameter increasing cutter has an inner diameter equal to or larger than the outer diameter of the enlarged diameter portion. According to this means, the anticorrosion sleeve can be removed without damaging it, so that it is possible to avoid mixing the cut pieces of the anticorrosion sleeve into the pipe. At this time, the diameter of the branch hole is increased beyond the diameter-enlarged portion of the anticorrosion sleeve. In this means, even if the locking claw described below is present at the lower end of the anticorrosion sleeve, the anticorrosion sleeve is pulled out from the branch hole after the diameter increase if the locking claw is smaller in diameter than the enlarged diameter portion at the upper end. Can do.

  On the other hand, when the anticorrosion sleeve includes a lower end locking claw that engages with the branch hole in the pipe, the diameter increasing cutter has an inner diameter capable of cutting the locking claw. According to this means, the anticorrosion sleeve can be pulled out while minimizing the degree of diameter increase to the same diameter as that of the body portion of the anticorrosion sleeve. In addition, in this means, when the diameter expansion part mentioned above exists in the upper end of an anticorrosion sleeve, this diameter expansion part is also cut | disconnected by the cutter for diameter increase.

  On the other hand, there are two ways of pulling out the anticorrosion sleeve by the center drill. One of them is a mode in which the center drill and the anticorrosion sleeve are frictionally engaged by setting the outer diameter of the center drill to a diameter that can be tightly inserted into the anticorrosion sleeve. According to this means, since the center drill and the inner diameter of the anticorrosion sleeve are substantially the same diameter, it is possible to avoid the anticorrosion sleeve from being inclined to the left and right when being pulled out.

  The other one is to provide a locking portion that elastically protrudes from the center drill and can be locked to the lower end of the anticorrosion sleeve. According to this means, after the locking portion expands and contracts to a small diameter and passes through the anticorrosion sleeve, the center drill is further lowered so that the locking portion is exposed from the lower end of the anticorrosion sleeve and at the same time the locking portion is elastic. Thus, the anticorrosion sleeve can be pulled out together with the center drill while maintaining the engaged state.

  In order to prevent cutting powder and the like from being mixed into the pipe, it is preferable that the anticorrosion sleeve is not damaged as much as possible at the time of removal, but rust or the like may occur on the inner surface of the anticorrosion sleeve over time. In such a case, it is difficult to insert the center drill into the anticorrosion sleeve only by pushing without rotating the center drill. Therefore, in the present invention, means for selectively providing a reamer having a diameter equal to or smaller than the inner diameter of the anticorrosion sleeve at the tip of the center drill is selectively used.

  As described above, according to the present invention, since the center drill for pulling out the anticorrosion sleeve is provided at the tip of the diameter increasing cutter, the anticorrosion sleeve can be removed without dropping into the pipe at the same time as the branch hole diameter increasing work. it can. Further, by changing the diameter of the diameter increasing cutter, it is possible to perform the diameter increasing and removal work while corresponding to various anticorrosion sleeves.

  Furthermore, by making the outer diameter of the center drill close enough to be inserted into the anti-corrosion sleeve, the center drill can be tightly inserted into the anti-corrosion sleeve by pushing in. It can be avoided. Further, the anticorrosion sleeve can be pulled out more reliably by providing an engaging portion that elastically protrudes from the center drill and can be engaged with the lower end of the anticorrosion sleeve.

  Furthermore, by providing a reamer having an inner diameter equal to or smaller than the inner diameter of the anticorrosion sleeve at the tip of the center drill, the center drill can be more reliably inserted into the anticorrosion sleeve, and the above-described extraction can be performed reliably.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an anticorrosion sleeve removal apparatus according to a first embodiment of the present invention. In the figure, 1 is a cutter for increasing the diameter, and 2 is a center drill provided at the tip of the cutter 1, both of which are arranged up and down on a coaxial line. The diameter increasing cutter 1 is a conventionally known one, and its end 1a can be attached to a rotary tool (not shown) or its attachment 3. The center drill 2 is provided with a reamer 2b at the front end of the body portion 2a, and is provided with a locking portion 2c made of a return claw elastically biased outward.

  The work process comprising the removal device having the above-described configuration will be described with reference to FIGS. 2 to 6. First, a saddle water faucet 4 is attached to the water main pipe P, and its valve body 5 is in an open state. That is, it is the state of the indefinite water with which water flow was maintained. Reference numeral 6 denotes a cylindrical rotary tool for drilling the main pipe P connected to the upward water passing portion of the saddle water faucet 4, and a branch pipe (not shown) usually has a lateral water passage through the saddle water faucet 4. Connected to the part. The saddle water faucet 4 has a built-in anticorrosion sleeve 8 located in the branch hole 7 of the water main pipe P. The anticorrosion sleeve 8 has an enlarged diameter portion 8b that engages with the opening surface of the branch hole 7 at the upper end of the trunk portion 8a, and a lower end engaging member for preventing the branch hole 7 from coming off inside the water main pipe P. It has a pawl 8c.

  In this unrestricted water state, the removal device is inserted into the rotary tool 6 (FIG. 2), and the removal device is lowered through the valve body 5 in the opened state to insert the center drill 2 into the rust prevention sleeve 8 (FIG. 3). ). At this time, since the reamer 2b having the same diameter as the inner diameter of the anticorrosion sleeve 8 is provided at the tip of the center drill 2, rust and the like adhering in the anticorrosion sleeve 8 are ground by the reamer 2b. The anticorrosion sleeve 8 can be inserted more reliably. During this time, the locking portion 2c of the center drill 2 has its tapered surface pressed by the anticorrosion sleeve 8 and contracts to a small diameter, so that the insertion of the center drill 2 is not hindered.

  When the removal device is further lowered, the locking portion 2c of the center drill 2 is exposed from the lower end of the rust prevention sleeve 8, and at the same time, the locking portion 2c is elastically expanded in diameter (FIG. 4). Here, the body 2 a of the center drill 2 is substantially the same as the inner diameter of the anticorrosion sleeve 8, while the engaging portion 2 c has a diameter that can be engaged with the lower end of the anticorrosion sleeve 8.

  The lowering is continued and the diameter increasing cutter 1 is rotated by the rotary tool described above to increase the diameter of the branch hole 7 (FIG. 5). Here, since the diameter increasing cutter 1 is set to have substantially the same diameter as the body portion 8a of the anticorrosion sleeve 8, the upper end enlarged diameter portion 8b and the lower end locking claw 8c of the anticorrosion sleeve 8 are cut when the diameter is increased. . Accordingly, the anti-corrosion sleeve 8 falls out of the branch hole 7 'after the diameter increase, but the barrel 2a of the center drill 2 is set to be almost the same as the inner diameter of the anti-corrosion sleeve 8. Therefore, when the diameter is increased, the anti-corrosion sleeve 8 Are lowered together with the center drill 2 inserted.

  Subsequently, the anticorrosion sleeve 8 is removed by pulling out the removal device (FIG. 6). That is, since the engaging portion 2c of the center drill 2 is engaged with the lower end of the anticorrosion sleeve 8, the anticorrosion sleeve 8 can be removed simultaneously with the withdrawal of the removal device. Moreover, since the trunk | drum 2a of the center drill 2 is set substantially the same as the internal diameter of the anti-corrosion sleeve 8, the anti-corrosion sleeve 8 does not incline and can be drawn straight up.

  Next, FIG. 7 shows the removal apparatus according to the second embodiment, and FIGS. 8 to 10 show the work procedure by the removal apparatus. Also in this embodiment, the configuration and installation mode of the anticorrosion sleeve 8, and the removal device including the diameter increasing cutter 10 and the center drill 20 are the same as those in the above embodiment, but this embodiment related to the differences. First, the diameter increasing cutter 10 has an inner diameter that is greater than or equal to the enlarged diameter portion 8a of the anticorrosion sleeve 8, and the center drill 20 has a reamer 20a that matches the inner diameter of the anticorrosion sleeve 8 at the tip. The intermediate locking portion is omitted, and instead, the outer diameter of the barrel portion 20b is made to coincide with the inner diameter of the anticorrosion sleeve 8, and the barrel portion 20b can be tightly inserted into the anticorrosion sleeve 8.

  Thus, according to the removal device, the valve body 5 is opened from the rotary tool 6 branched by the saddle faucet 4 and is inserted and lowered in the state of constant water (FIG. 8). After being inserted into the anticorrosion sleeve 8 (FIG. 9), the diameter of the branch hole 7 is increased by the diameter increasing cutter 10 so that the center drill 20 is withdrawn through the branch hole 7 ′ after the diameter increase. The anticorrosion sleeve 8 can be removed while being tightly inserted into the body 20a of the drill 20 (FIG. 10).

Overall view of the device of the present invention according to the first embodiment Process diagram showing the work procedure by the equipment (device insertion process to the branch pipe) Process diagram showing the work procedure by the equipment (center drill insertion process to the anticorrosion sleeve) Process diagram showing work procedure by the equipment (center drill penetration process) Process diagram showing work procedure by the equipment (diameter increasing process) Process diagram showing the work procedure by the equipment (drawing process) Overall view of the device of the present invention according to the second embodiment Process diagram showing the work procedure by the equipment (device insertion process to the branch pipe) Process diagram showing the work procedure by the equipment (center drill insertion process to the anticorrosion sleeve) Process diagram showing the work procedure by the equipment (drawing process)

Explanation of symbols

1, 10 Cutter for increasing diameter 2, 20 Center drill 3 Attachment 4 Saddle faucet 5 Valve element 6 Rotating tool 7 Branch hole 8 Anticorrosion sleeve P Water main

Claims (6)

A cutter for increasing the diameter of a pipe branch hole, and a center that is inserted into the anti-corrosion sleeve prior to the cutter for increasing the diameter and that can be pulled out of the pipe branch hole after the diameter increase while being inserted into the anti-corrosion sleeve Anti-corrosion sleeve removal device consisting of a drill. The anti-corrosion sleeve removing device according to claim 1, wherein the diameter increasing cutter has an inner diameter equal to or greater than an outer diameter of the upper-end enlarged portion of the anti-corrosion sleeve. The anti-corrosion sleeve removing device according to claim 1, wherein the diameter increasing cutter has an inner diameter capable of cutting a lower end engaging claw of the anti-corrosion sleeve. 4. The anticorrosion sleeve removing device according to claim 1, 2 or 3, wherein the center drill has an outer diameter capable of being tightly inserted into the anticorrosion sleeve. 4. The anticorrosion sleeve removal device according to claim 1, wherein the center drill has an engaging portion that elastically protrudes and can be engaged with a lower end of the anticorrosion sleeve. 6. The anticorrosion sleeve removing device according to any one of claims 1 to 5, wherein the center drill includes a reamer having an inner diameter of the anticorrosion sleeve or less at the tip.

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