JP2007010077A - Gas shut-off technique for regeneration-repaired pipeline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To actualize low-cost gas shut-off work by easily and quickly performing gas shut-off to a regeneration-repaired pipeline branching from a branch line without excavating a road. <P>SOLUTION: Gas shut-off is performed by inserting a shut-off tool into the regeneration-repaired pipeline formed by giving lining treatment to attached pipelines B1, B2 including a vertical joint part C2. In this case, there are a drilling step of mounting a drill machine 10 at an upper end C2<SB>0</SB>for opening a resin reservoir J in the vertical joint part C2 and a shut-off step of inserting the shut-off tool through an opening in the upper end C2<SB>0</SB>into the vertical joint part C2 for shutting off gas distributing in the attached pipelines B1, B2. In the drilling step, a suction hose which is connected at one end to a mounting port 10C communicated with a drilling gas exhaust space inside the drill machine 10 is connected at the other end to a negative pressure collecting container 12 for collecting in the negative pressure collecting container 12 drilling gas produced in the resin reservoir J during drilling. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a gas shut-off method having a vertical joint part whose upper end can be opened in the middle of an attached pipe line, and opening the upper end and inserting a shut-off jig, wherein the attached pipe including the vertical joint part The present invention relates to a gas cutoff construction method for a corrected and repaired pipeline in which the cutoff jig is inserted into a corrected and repaired pipeline whose lining is processed.

  In general, in order to draw a gas pipe line from a main pipe attached under a road into a private house or the like, a pipe line having a form as shown in FIG. 1 is provided. That is, from this branch pipe A attached under the road, the pipe B1 is branched via the branch joint portion C1, and this pipe B1 is attached from the road side across the boundary S to the private land side ( (The pipeline attached from the boundary S to the road side is called “supply pipe”, and the pipeline attached to the private land side is called “inner pipe”). In the private land, a vertical joint C2 is provided in the middle of the auxiliary pipes B1 and B2, and a pipe B2 downstream from the vertical joint C2 is connected to the gas meter M through a vertical pipe. And connected to piping in the house provided with gas plugs V1, V2 at the ends.

  As described above, it is general that the pipe branched from the main branch A is subjected to a lining process in order to repair the old pipe. As the lining method at this time, a resin lining method for forming a resin layer on the inner surface of the pipe line, or a reverse sealing method for bonding a tube-shaped sealing material to the inner surface of the pipe line while being reversed is known (for example, (See Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 08-141501 JP 09-70889 A

The upper end C2 ₀ of the vertical joint portion C2 described above are openable plug is mounted, by inserting the closing member to remove the plug in the vertical joint portion C2, the vertical joint portion C2 to the downstream side It is possible to shut off the gas supply. However, if the lining process described above is applied to the conduit B1, B2 comprising vertical joint portion C2 would resin reservoir accompanying lined near the upper end C2 ₀ in the vertical joint portion C2 is formed since, thereby will be closed upper end C2 _0, it is impossible to perform interruption of gas supply by the closing member as described above.

  Therefore, for a pipeline that has been repaired and repaired in such a manner, a gas bag is attached to the branch joint portion C1 of the main branch A after excavating the road portion, and the branch joint portion C1 A gas blocking work is performed in which the upper end plug is opened and a blocking jig is inserted into the branch joint C1. In addition, when it is difficult to excavate the road part, after excavating the excavable part in the private land and exposing the pipe lines B1 and B2, it is also carried out by pressure-bonding and shutting off using a hydraulic squeeze device Yes.

  However, in the former case, it takes a considerable time (usually 30 minutes or more) from excavating the road portion to completing the gas shutoff, and there is a problem that it cannot be handled in an emergency. Furthermore, when excavating a road portion, there is a problem that the cost for restoring the original road (especially paved road) and the disposal cost of industrial waste associated with the road excavation increase and the construction cost increases. In the latter case, the lining formed on the inner surface of the pipeline is damaged, so when the gas supply is resumed after the gas is shut off, it is necessary to replace the pipeline, resulting in a large-scale construction. There is a problem that must be done.

  On the other hand, as described in, for example, JP-A-10-151505, a cutting jig for opening a resin reservoir near the upper end of the vertical joint C2 has been proposed. When the upper end of the vertical joint portion C2 is opened, the scraped resin residue is mixed into the downstream side of the pipe line, which causes a problem of adversely affecting equipment such as a gas meter installed on the downstream side. In addition, since the resin adheres to the inner surface of the vertical joint portion C2, there is a problem that even if a shut-off jig is inserted, the shut-off portion cannot be brought into close contact with the inner surface, and gas shut-off cannot be performed effectively. .

  The present invention has been proposed in order to cope with such a situation, and gas excision can be easily and quickly performed on a corrected and repaired pipe branched from this branch pipe without excavating the road side. It can be performed and low-cost gas shut-off work can be realized, and when inserting a shut-off jig into a pipeline that has been repaired, a good shut-off jig can be prevented by preventing the resin debris from entering the downstream side. It is an object of the present invention to be able to ensure the blocking performance by.

  In order to achieve such an object, the present invention includes, in one aspect, a gas which has a vertical joint part whose upper end can be opened in the middle of an attached pipe line, and opens the upper end and inserts a shut-off jig. A gas shut-off method for performing shut-off, wherein the shut-off jig is inserted into a corrected and repaired pipe line in which the attached pipe line including the vertical joint portion is lined. A drilling step for mounting and opening a resin reservoir in the vertical joint portion; and a blocking step for blocking a gas flow in the attached pipe line by inserting a blocking jig into the vertical joint portion from the opening at the upper end. In the perforating step, one end of the suction hose, one end of which is connected to a mounting port communicating with a perforated waste discharge space inside the perforator, is connected to the negative pressure recovery container, and the perforated residue of the resin pool generated during perforation Is recovered in the negative pressure recovery container. It is characterized in.

  In addition, in addition to the above-described features, in the drilling step, the blocking portion of the inner surface of the vertical joint portion is smoothed by the scraping action of the drilling machine.

  In addition, in addition to the above-described characteristics, each of the steps is performed through a gas bag attached to the upper end.

  According to the gas shut-off method for repaired pipelines with these characteristics, the resin pool in the vertical joint formed by the lining process is opened in the drilling process, and the shut-off process is performed from which the shut-off jig is inserted. Therefore, if the vertical joint portion is a pipeline existing in private land, gas can be shut off promptly without excavating the road side. At this time, in the perforating step, one end of the suction hose connected to the attachment port communicating with the perforated waste discharge space inside the perforator is connected to the negative pressure recovery container, so that the resin reservoir generated during perforation can be obtained. Since the perforated debris is collected in the negative pressure recovery container, the perforated debris of the resin is not mixed downstream and does not adversely affect devices such as a gas meter.

  Also, in the drilling process, the cutting part of the vertical joint part is smoothed by the scraping action of the drilling machine, so that the blocking jig can be brought into close contact with the smoothed blocking part and good blocking is achieved. The blocking performance by the jig can be ensured.

  Furthermore, since these steps are performed through a gas bag attached to the upper end of the vertical joint portion, it is possible to realize a safe operation with the gas ejection to the periphery being minimized.

  According to the above-described features, according to the gas shut-off method for the corrected repaired pipe according to the present invention, the gas shut-off can be easily and quickly performed on the corrected repaired pipe branched from the branch pipe without excavating the road side. This can be done and a low-cost gas shut-off work can be realized. Further, when inserting the blocking jig into the corrected pipeline, it is possible to prevent the resin residue from being mixed into the downstream side and to secure a blocking performance with a good blocking jig.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 2-4 is explanatory drawing explaining the gas interruption | blocking construction method of the corrected repair completed pipe line which concerns on embodiment of this invention. In an embodiment of the present invention, the upper end C2 ₀ in the middle of the attached pipe B1, B2 having a vertical joint portion C2 openable to expose the vertical joint portion C2 by drilling a private property or the like, is opened from the upper end C2 ₀ to insert a closing member in the vertical joint C2, it is intended to cut off the gas supply to the downstream side than that. At this time, it is assumed that the auxiliary pipes B1 and B2 including the vertical joint portion C2 are subjected to correction repair by a lining process, and as shown in FIG. 2, the upper end in the vertical joint portion C2 in the vicinity of C2 _0, the resin reservoir J is formed, in a state in which the upper end C2 ₀ is blocked.

In contrast, by attaching the drilling machine 10 to the upper end C2 ₀ of the vertical joint C2, it is opened by piercing the resin reservoir J of the vertical joints C2. The drilling machine 10 includes a drill 10A and a hole saw 10B that make a hole in the center, and one end of the suction hose 11 is connected to the attachment port 10C. As shown in FIG. 3, a punching waste discharge space 10 </ b> D is formed inside the punching machine 10, and one end of the suction hose 11 is connected to an attachment port 10 </ b> C communicating with the punching waste discharge space 10 </ b> D. Become.

  The other end of the suction hose 11 is connected to the negative pressure recovery container 12 via the valve 13. The negative pressure recovery container 12 is a hollow pressure-resistant container provided with a pressure gauge 12 </ b> A communicating with the inside, and is connected to a suction pump 16 via a filter 14 and a valve 15.

When the resin reservoir J in the vertical joint C2 is to be drilled by the drilling machine 10, the valve 13 is closed and the valve 15 is opened, and the negative pressure recovery container 12 is previously in a negative pressure state by the suction pump 16, wearing the drilling machine 10 to the upper end C2 _0, perforating with opened valve 13 by closing the valve 15. Thereby, the resin residue at the time of drilling is recovered in the negative pressure recovery container 12 by the negative pressure suction force in the negative pressure recovery container 12, and the resin residue is mixed into the downstream side of the vertical joint portion C2. Can be prevented.

  Further, after opening the resin reservoir J with the hole saw 10B of the punching machine 10, the blocking portion of the inner surface of the vertical joint C2 is smoothed by the scraping action of the hole saw 10B as necessary (see FIG. 3). The inner surface of the vertical joint portion C2 may be uneven due to the adhesion of the resin, and if there is such an unevenness in the blocking portion on the inner surface of the vertical joint portion C2, good blocking performance by the blocking jig can be obtained. Therefore, over-gas is generated. In order to prevent this, the blocking portion of the inner surface of the vertical joint C2 is smoothed by using the scraping action of the drilling machine 10 described above.

Then, after these steps have been completed, as shown in FIG. 4, remove the drilling machine 10 from the upper end C2 ₀ of the vertical joints C2, by inserting the closing member 20 from the upper end C2 ₀ was opened, the vertical joint C2 is gas shut off. As the blocking jig 20, a known jig called an ST stopper can be used.

  A more specific process of the gas shut-off method for the corrected and repaired pipeline according to the embodiment of the present invention is summarized as follows according to FIG.

First, as preparatory process S1, private land etc. are excavated and the vertical joint part C2 is exposed. Then, the soil attached to the upper end C2 ₀ of the vertical joint portion C2 is removed by a wire brush. On the other hand, the valve 13 of the negative pressure recovery container 12 is closed and the valve 15 is opened, and the suction pump 16 is connected to the valve 15 side so that the inside of the negative pressure recovery container 12 is in a negative pressure state in advance.

Then, as the upper end opening process of the vertical joint, loosen the plugs of the upper end C2 _0, the gas bag is attached to the upper end C2 _0, remove the plug in the gas bag. The upper C2 ₀ to drilling machine 10 the mounting (S3), to connect the negative pressure circuit housing 12 which is a negative pressure in advance to the drilling machine 10 via a suction hose 11.

Then, by opening the drilling machine 10 side of the valve 13, perforating the resin reservoir J of the upper end C2 ₀ to drive the drilling machine 10 (S5). Resin perforations generated during the perforation are collected in the negative pressure recovery container 12 by a negative pressure. When the resin reservoir J is opened, the valve 13 is closed and the negative pressure recovery container 12 is removed (S6).

Then, remove the drilling machine 10 in a gas bag which is attached to the upper end C2 ₀ (S7). At this time, pre-closing member to leave put into the gas bag, at the same time removing the drilling machine 10, by inserting the closing member 20 from the open mouth of the upper end C2 ₀ (S8), expanded insertion after closing member Then, the gas cutoff is completed as shown in FIG. 4 (S9).

  At this time, when the gas flowing downstream is detected and the lining in the vertical joint C2 is not smooth and sufficient shutoff performance cannot be obtained even with the shutoff jig, drilling by the punching machine 10 is performed again. Then, the inner surface of the vertical joint C2 is smoothed by the scraping action of the drilling machine 10 as shown in FIG.

  Since the embodiment of the present invention has such a feature, it is possible to easily and quickly perform a gas shut-off on the corrected and repaired pipeline branched from the branch without excavating the road side, Low-cost gas shut-off work can be realized. Further, when inserting the blocking jig into the corrected pipeline, it is possible to prevent the resin residue from being mixed into the downstream side and to secure a blocking performance with a good blocking jig.

It is explanatory drawing which shows the pipe installation form at the time of drawing in a gas pipe line from the main branch pipe attached below the road to the house of a private land. It is explanatory drawing explaining the gas interruption | blocking construction method of the corrected repair completed pipe line which concerns on embodiment of this invention. It is explanatory drawing explaining the gas interruption | blocking construction method of the corrected repair completed pipe line which concerns on embodiment of this invention. It is explanatory drawing explaining the gas interruption | blocking construction method of the corrected repair completed pipe line which concerns on embodiment of this invention. It is explanatory drawing which shows the flow of the gas interruption | blocking construction method of the corrected pipeline which concerns on embodiment of this invention.

Explanation of symbols

A Main branch pipe B1, B2 Pipe line C1 Branch joint part C2 Vertical joint part C2 ₀ Upper end 10 Drilling machine 10A Drill 10B Hole saw 10C Mounting port 10D Perforated waste discharge space 11 Suction hose 12 Negative pressure recovery container 13, 15 Valve 14 Filter 16 Suction Pump 20 shut-off jig

Claims (3)

A gas shut-off method having a vertical joint part, the upper end of which can be opened in the middle of the attached pipe line, and a gas shut-off method in which the upper end is opened and a shut-off jig is inserted, wherein the attached pipe includes the vertical joint part. In the gas shut-off method of inserting the shut-off jig into the corrected and repaired pipeline that lined the road,
A drilling step of attaching a drilling machine to the upper end, and opening a resin reservoir in the vertical joint part;
A blocking step of blocking a gas flow in the auxiliary pipe line by inserting a blocking jig into the vertical joint from the opening at the upper end,
In the perforating step, one end of a suction hose connected to a mounting port communicating with a perforated waste discharge space inside the perforator is connected to a negative pressure recovery container, and a perforated residue of a resin pool generated during perforation is removed. A gas barrier construction method for a corrected and repaired pipe line, wherein the gas is recovered in the negative pressure recovery container.   2. The gas barrier construction method for a corrected and repaired pipeline according to claim 1, wherein, in the drilling step, the blocking portion of the inner surface of the vertical joint portion is smoothed by a scraping action of the drilling machine.   3. The gas shut-off method for a corrected and repaired pipeline according to claim 1, wherein each of the steps is performed via a gas bag attached to the upper end.

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