JP5547614B2 - Replacement method for attached equipment - Google Patents

Description

  The present invention relates to a method for exchanging ancillary equipment, and it is novel to install ancillary equipment such as an air valve, a fire hydrant, etc., which is provided in a flange connection with a T-shaped pipe formed in the upper part of the main pipe of the water distribution pipe. More particularly, the present invention relates to a replacement method for an accessory installed in a large-diameter pipe having a diameter of 1200 to 2400 mm.

  In general, water distribution pipes are equipped with ancillary equipment such as an air valve for removing air in the pipe and sucking air into the pipe, and a fire hydrant used for fire fighting and draining work in the water pipe. Is provided by being flange-bonded to a T-shaped pipe formed at the upper part of the water distribution main pipe. As the air valve, a single-mouth air valve is installed at a nominal diameter of 350 mm or less, and a double-mouth air valve is installed at a diameter of 400 mm or more. In the case of a fire hydrant, a single-mouth fire hydrant is installed with a pipe having a nominal diameter of 100 to 250 mm, a double-mouth fire hydrant is used with a pipe having a nominal diameter of 300 to 350 mm, and there are an underground type and a ground type.

  In addition, as described above, the diameter of the T-tube provided in the large-diameter pipe increases, and correspondingly, the joint flange with the short T-tube interposed between the accessory facilities is also provided. It becomes a large one of about 600 mm.

  If an accessory such as an air valve installed in such a large-diameter pipe breaks down, it will not be possible to stop the water, and it will be forced to work in an undisturbed state, which is very difficult. It is highly dangerous.

  Although the applicant investigated the prior art documents regarding the present invention, the applicant could not find any documents that are related to the present invention and seem to be similar.

  Conventionally, the problem to be solved by the present invention is that the replacement work of the auxiliary equipment in the large-diameter pipe has to be performed in an undisturbed state of water, and is practically impossible especially for an old installation. This is the point that there is no method for performing this in a short period of time with high accuracy and without danger.

  In order to solve this problem, the replacement method for the attached equipment according to the present application is to excavate from the ground surface to the lower area of the water distribution main, support the piping with support materials, and provide a T-shape provided above the water distribution main. A base plate is attached to the circumference of the pipe, a metal belt that suppresses the lower half circumference of the pipe and the pipe is fastened with bolts, and the flange is joined to the top of the short pipe that is flanged to the T-shaped pipe Bolts that replace the bolts and nuts of the equipment, and then attach a working device having a casing surrounding the T-tube to the attached equipment on the foundation plate, and then pour water into the casing to fasten the T-tube and the short pipe. Remove the attachment and the short pipe from the upper part of the casing, and remove it with the working valve in use. Insert the new auxiliary equipment and the new short pipe from the upper part of the casing and insert them from the upper part of the casing. Positioning the Nji is characterized by bolting the new stub tube and T-tube flange from the upper housing.

  In addition, according to the replacement method of the accessory equipment according to the present application, the operation of removing the bolt after the water injection is performed by a bolt driver from above the casing, and the casing is set on the lower pipe and the lower pipe. The upper tube is set on the central tube and the upper tube, and the bolt driver and the lifting shaft are inserted therethrough, and the lower tube is formed with a viewing window.

  In addition, according to the replacement method of the accessory equipment according to the present application, an insertion port of a peeling device is formed in the lower pipe, and when the packing interposed between the flanges of the T-shaped tube and the short tube is not peeled off, the insertion is made from this insertion port. It is characterized in that the packing is peeled off by a peeling device, and the flange joint bolt of the short pipe and the T-shaped pipe is finally rearranged upward.

  The auxiliary equipment replacement method according to the present invention is configured as described above. Therefore, the work can be executed accurately in the state of constant water, the work is not dangerous, no special skill is required, and the cost and time can be greatly reduced.

It is a figure which shows a 1st process. It is a figure which shows a 2nd process. It is a figure which shows a 3rd process. It is a figure which shows a 4th process. It is a figure which shows a 5th process. It is a figure which shows a 6th process. It is a figure which shows a 7th process. It is a figure which shows an 8th process.

  This was realized by configuring as illustrated in the drawings and described in the examples.

  Next, an example of a preferred embodiment of the present invention will be described with reference to the drawings. In the figure, 1 indicates a pipe, in particular, a pipe for water conveyance from a reservoir (dam), and the area around the double-mouthed air valve 2 to be replaced from the ground surface is excavated to the lower area of the pipe 1 as shown in FIG. The pipe 1 is exposed.

  The double-mouth air valve 2 described above is installed by being flange-bonded to an upper flange of a short pipe 4 that is flange-bonded to a flange of a T-shaped pipe 3 provided on the upper surface of the pipe 1. A foundation plate 5 is mounted around the T-tube 3 on the upper surface of the pipe 1. The base plate 5 has a flat upper surface, and bolts 6, 6... Are installed near the outer periphery of the upper surface for joining and fastening a lower flange of a lower pipe of a construction apparatus described later. Further, on both sides of the lower surface of the foundation plate 5, legs 7, 7a... Are integrally provided along the rounded surface of the upper surface of the pipe 1, and the upper portion of the center portion 7 is a T-shaped tube. Since it is in contact with 3, a large area is used for reinforcement. In the figure, reference numerals 37 and 37 denote metal belts that suppress the lower half circumference of the pipe 1. The metal belts 37, 37 are firmly fastened by fastening bolts 41, 41 between the leg bodies 7a, 7a of the base plate 5 described above. In the figure, 38 and 38 are support members below the pipe 1. Further, in the figure, 39 and 39 are closed lids for testing the water pressure in the pipe. In the present construction method, the closed lids 39 and 39 are not actually provided and are in an indefinite water state. Reference numeral 40 denotes a viewing window for checking the position inside the pipe 1.

  In this first step, the tightening bolt nut 8 between the double-ended air valve 2 and the short tube 4 is replaced, and the tightening bolt nut 9 between the short tube 4 and the T-shaped tube is replaced. At this time, the bolt nut 9 is changed from the originally upward direction to the downward direction to prevent the bolt from dropping in the subsequent process, and the bolt nut 9 is removed in several places, and the subsequent process, that is, the new short pipe It is assumed that the positioning for the installation can be easily performed. Further, the cap 10 and the cover of the double-ended air valve 2 are removed.

  Next, in the second step, a construction apparatus is attached to the upper surface of the foundation plate 5 described above. This construction apparatus has a casing 11 surrounding the periphery of the T-shaped tube 3, the short tube 4, and the double-ended air valve 2, and the casing 11 includes a lower tube 12 surrounding up to the upper side of the double-ended air valve 2, A cylindrical central tube 13 that is flanged to the lower tube 12 and an upper lid body 14 that is flanged to the upper portion of the central tube 13 are configured.

  The casing 11 has the bolts 6, 6... Inserted into the bolt holes of the lower flange of the lower tube 12, and tightened with nuts from above, and a positioning member 15 is provided around the lower tube 12. The supporting member 16 having the positioning member 15 joined by flange is fixed on the pipe 1 by the supporting member 17. Prior to the mounting of the casing 11, the flange of the T-shaped tube 3 is reused. Therefore, in order to reinforce the flange, a cylindrical reinforcing member 18 is associated with the bolts 9, 9,. Installed.

  Further, an insertion hole 20 for the lifting shaft 19 is formed in the center of the upper lid body 14, and the lifting shaft 19 is inserted into the casing 11 through the insertion hole 20. At the lower end of the lifting shaft 19, a fixing portion 21 is formed which is fitted with a bolt remaining above the double-ended air valve 2 with the cover removed and integrated with the double-ended air valve 2. In addition, wire support rings 22, 22... Are provided around the insertion hole 20 on the upper surface of the upper lid body 14, and wires 23, 23 with the support rings 22, 22 interposed are provided at the upper end of the lifting shaft 19. In addition, the upper pressure arm 28 passes through both end holes. Reference numeral 24 denotes an operation lever for the wire 23.

  In the subsequent third step, the upper lid 14 of the casing 11 is once removed, and water is poured into the casing 11 from above to fill the casing 11 with water. This water injection operation is to inspect the water pressure in the casing 11. In this filled state, the upper lid body 14 is again flange-joined to the central tube 13, and the bolt 9 is linearly moved near the outer periphery of the upper lid body 14. The bolt driver 27 is inserted from the insertion hole 2b provided at the position corresponding to the above, and the bolts 9 changed downward are sequentially removed. This operation is performed while visually confirming from the viewing window 25 formed in the lower tube 12.

  Wire support rings 22, 22 are provided around the insertion hole 26 of the upper lid 14, and the wires 23, 23 with the support rings 22, 22 interposed on an upper pressure arm 28 provided at the upper end of the bolt driver 27. It is passed through the provided ring. As described above, reference numeral 24 denotes an operation lever for the wire 23. The bolts 9 are removed by the bolt driver 27 by the action of the upper pressure arm 28 at the upper end of the lifting shaft 19 so that pressure is applied from above and the lower flange of the short pipe 4 is connected to the flange of the T-shaped pipe 3. It is performed in a state where it is strongly pressed against.

  In the fourth step, when the above-described removal of the bolts 9, 9,... Is completed, the water filled in the casing 11 is drained using a pressure relief valve provided on the upper lid 14 although not particularly shown. Next, a pull-up wire 29 is attached to a ring provided on the top of the pull-up shaft 19, and the double-mouthed air valve 2 and the short pipe 4 are pulled up together using a winch or the like. At this time, the bolts that fasten the central tube 13 and the upper lid body 14 are released, the upper lid body 14 is removed, the double-mouth air valve 2 and the short pipe 4 are taken out of the casing 11 and removed.

  In this operation, when the double-mouthed air valve 2 and the short pipe 4 are moved from the lower pipe 12 into the central pipe 13, a plate-like work valve (control valve) previously stored in the support member 16 is used. 30 is inserted into the lower tube 12 through a slit formed in the wall surface of the lower tube 12. This insertion operation is performed by operating a long bolt 33 protruding from the outer end of the support member 16. Further, the long bolt 33 is operated by a guide rail 32 integrally equipped with a work valve 30. When the work valve 30 enters the lower pipe 12, it overflows with water overflowing from the T-shaped pipe 3. Although pushed, the water is deterred to a certain level by its weight. Since the working valve 30 is heavy, it requires power for movement, and rollers 31 are provided as movement assistance. Further, since the guide rail 32 is closed from the support member 16 in the slit of the lower pipe 12, there is no risk of water leakage even during water injection. This water leakage can be prevented by providing a check valve plate on the inner surface of the slit.

  Further, prior to this lifting operation, when the packing interposed between the T-shaped tube 3 and the short tube 4 is not peeled off, the peeling device is inserted from the peeling device insertion port 34 formed at a position corresponding to the joint portion. Then, the packing is forcibly removed.

  Next, in the fifth step, the above-described lifting shaft 19 is used as an insertion shaft for a new repair valve 35 or the like, and an insertion positioning tool 36 is attached to a fixing portion 21 provided at the lower end of the shaft 19. The new short pipe 4a is attached in an integrally connected state, and the wire 29 is released together with the upper lid 14 from the winch or the like, suspended and inserted into the casing 11. A needle corresponding to the bolt hole in the flange of the T-shaped tube 3 is attached to the bolt hole of the flange of the new short pipe 4a, and positioning is performed by aligning this needle with the bolt hole. That is, the shaft 19 and the positioning tool 36 can be rotated.

  By this insertion and lowering, the lower end of the needle pushes down the work valve 30 in the lower pipe 12 and returns it to the guide rail 32. At this time, the long bolt 33 is operated to lower the guide rail 32 and the work valve 30. The casing 11 is restored by pulling back from the tube 12 into the support member 16. When this positioning operation is completed, the fixing portion 21 and the positioning tool 36 are once lifted and removed, the shaft 19 is lowered again, and is pressed by the upper pressure arm 28 from above the new repair valve 35.

  In the sixth step after the positioning and pressing, the bolt driver 27 is inserted through the insertion hole 26 of the upper lid 14 in the same manner as the third step described above, and the flanges of the new short tube 4a and the T-shaped tube 3 are bolted. Tighten by. This bolt is provided in advance at the tip of the bolt driver 27.

  When the above bolting operation is completed, the casing 11 is drained, it is confirmed that there is no water leakage from the joining of the T-shaped tube 3 and the new short tube 4a, and the casing 11 and its associated members and devices are connected to the piping 1 (Seventh step).

  Following this removal operation, all of the shaft 19 holding the foundation plate 5 and the new repair valve 35 and the auxiliary member 36 interposed between the lower end of the shaft 19 and the new repair valve 35 are removed. Next, the bolts 9, 9... That fasten the T-shaped tube 3 and the new short tube 4a by flange joining are rearranged one by one. Finally, an efficient rapid air valve is attached to the repair valve 35, its function is confirmed, and the process ends (eighth process).

  The auxiliary equipment replacement method according to the present embodiment is configured as described above for the air valve. The present invention is not limited to this air valve, and can of course be applied to a fire hydrant that is flange-joined to a T-tube.

DESCRIPTION OF SYMBOLS 1 Piping 2 Double-mouthed air valve 3 T-shaped pipe 4 Short pipe 4a New short pipe 5 Foundation plate 6 Bolt 7 Leg 7a Leg 8 Bolt 9 Bolt 10 Cap 11 Casing 12 Lower pipe 13 Central pipe 14 Upper lid 15 Positioning member 16 Support member 17 Support member 18 Reinforcement member 19 Shaft 20 Insertion hole 21 Fixing part 22 Support ring 23 Wire 24 Operation lever 25 Viewing window 26 Insertion hole 27 Bolt driver 28 Upper pressure arm 29 Lifting wire 30 Work valve 31 Roller 32 Guide rail 33 Long Bolt 34 Peeling device insertion port 35 Repair valve 36 Auxiliary member 37 Metal belt 38 Bearing base 39 Closing lid 40 Viewing window 41 Fastening bolt

Claims (5)

  Excavate from the surface to the lower area of the water distribution main, support the piping with support materials, attach a foundation plate to the circumference of the T-shaped pipe provided at the top of the water distribution main, and lower the lower half of the foundation plate and piping Fasten the metal belt to be restrained with bolts, replace the bolt nuts of the attached equipment flanged to the upper part of the short pipe flanged with the T-shaped pipe, and then attach it from the T-shaped pipe on the foundation plate A working device having a casing surrounding the equipment is attached, water is poured into the casing, a bolt for fastening the T-shaped pipe and the short pipe is removed, and the accessory equipment and the short pipe are integrated from above the casing to work the working valve. The new accessory and new short pipe are integrated and inserted from above the casing, positioned on the T-tube flange, and the new short pipe and T-tube flange are inserted from above the casing. Exchange method of accessory equipment, characterized in that the bolting di.   The work for removing the bolt after the above water injection is performed by a bolt driver from above the casing, and the replacement method for the attached equipment according to claim 1.   The casing is composed of a lower tube, a central tube set on the lower tube, and an upper lid body that is set on the central tube and through which the bolt driver and the lifting shaft are inserted. A viewing window is formed in the lower tube. The replacement method for an accessory equipment according to claim 1, wherein the accessory equipment is replaced.   An insertion port of a peeling device is formed in the lower pipe, and when the packing interposed between the flanges of the T-shaped tube and the short tube is not peeled off, the packing is peeled off by the peeling device inserted from the insertion port. 4. Replacement method for ancillary equipment according to item 1 of items 1 to 3.   The method for exchanging ancillary equipment according to one of claims 1 to 4, wherein the flange joint bolts of the short pipe and the T-shaped pipe are finally rearranged upward.

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