JP2014009734A - Replacement method of pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of safely replacing an existing pipeline installed in an enclosure into a new pipeline in a short time.SOLUTION: A method of replacing an existing pipeline (a) installed in an enclosure 3 into a new pipeline moves the existing pipeline (a) within the enclosure 3; cuts the existing pipeline to a predetermined length in the same place; sequentially removes the existing pipelines from the enclosure 3; joins the new pipeline divided into plural ones with each other in the same place; and sequentially moves the new pipeline from the same place to the enclosure 3. According to this invention, the removal of an existing pipeline and the installation of a new pipeline can be performed in the same place and work efficiency is improved.

Description

  The present invention relates to a method for replacing an existing pipe installed on a premises with a new pipe.

  Various pipes are installed on the premises provided in buildings and various facilities. In the renovation work of buildings and various facilities, there is a case where the existing pipes installed on the premises in this way are replaced with new pipes. Conventionally, in this pipe replacement work, the entire premises are opened, and after removing the heat insulating material attached around the pipes, the pipes are cut to an appropriate length using a ceparso on the premises. The pipes were sequentially carried out from the premises. Moreover, after carrying out the existing piping from the premises in this way, new piping was carried in.

  For example, the cutting length of the pipe is shorter than the interval between the columns provided on the premises, and the pipe shortened in such a way is lifted from the premises using a chain block, then dropped from the gantry and moved in the passage. Then, the piping is taken out from the carry-out port. For example, Patent Document 1 discloses a duct hoisting device that lifts and constructs a duct in a large space factory or the like. Patent Document 2 discloses a method for preventing a piping module from being displaced during transportation by temporarily fixing it to a gantry.

Japanese Utility Model Publication No. 61-18296 JP 2012-37024 A

  Here, conventionally, the work for separating the pipe and the work for taking out the pipe are sequentially performed while moving the separator and the chain block along the campus. In addition, after unloading existing piping from the premises, new piping was loaded into the same location. However, the pitch of the pedestal for taking out the piping is about 3 to 3.5 m, and the number of times of cutting and the work for taking out may exceed about 90 times. In addition, other work was delayed while moving the Sepaso and chain blocks along the campus. In addition, it takes time and effort to change the lifting equipment such as tools and hanging objects every time it is moved, resulting in poor work efficiency.

  In particular, the premises where cold water piping is provided are used as maintenance passages. However, since the work passage is narrow, it is difficult to move workers if piping materials and tools are placed on the passage. In addition, existing steam pipes and the like pass through the campus, and there is heat dissipation and air leakage. The campus is hot and humid, and the working environment is not good. Furthermore, there are cases where the finish of existing piping is asphalt jute winding, but there are circumstances in which welding and gas cutting cannot be used because city gas piping is also laid on the premises. In addition, when exchanging cold water piping, the construction period must be removed and newly constructed within 5 months from the cold water stop in November to the start of supply in March of the following year. There were also circumstances.

  This invention is made | formed in view of this point, and it aims at providing the method which can replace | exchange the existing piping installed in the premises with new piping safely in a short period of time.

  In order to achieve the above object, according to the present invention, there is a method for replacing an existing pipe installed in a campus with a new pipe, the existing pipe is moved in the campus, and the existing pipe is installed at the same place. Is cut into a predetermined length, the existing pipes are sequentially removed from the campus, new pipes divided into a plurality are joined at the same place, and the new pipes are sequentially moved to the campus. A pipe replacement method is provided.

  In this pipe replacement method, the existing pipe is supported by the bearing device on the campus, the existing pipe is moved on the campus using the bearing device, and the new pipe is moved on the campus using the bearing device. Anyway. In this case, for example, the bearing device is interposed between the free bearing that moves the pipe, the bearing frame that supports the free bearing, and the free bearing and the bearing frame, and adjusts the angle of the free bearing. When the existing bearing is moved and the existing pipe is moved, the free bearing installation metal is interposed between the free bearing and the bearing mount, and when the new pipe is moved, the free bearing is installed. The free bearing may be directly supported on the bearing mount without interposing a hardware. In addition, you may make it mount existing piping directly on the said free bearing. Moreover, the flange part for joining new piping may be provided in the edge part of the new piping divided | segmented into plurality, and you may make it mount new piping on the said free bearing via a conveyance stand.

  According to the present invention, it is possible to remove an existing pipe and install a new pipe at the same place, thereby improving work efficiency. In this case, by proceeding with the plan with the cooperating company, not only can the process be shortened, but also the cost awareness can be shared. In the case of the conventional construction method, the movement distance between the material and the worker is increased, the efficiency is lowered, and the number of artificials is increased. The pipe replacement method of the present invention can be adopted regardless of existing or new construction.

  By adopting the so-called “free bearing method” in which existing piping or new piping is moved on the premises using a bearing device, the construction period and cost can be further reduced.

  Also, when joining new pipes, it is possible to join them using bolts, etc., by using flanges provided at the ends of the pipes, reducing the work burden at the site, and by flaring, etc. Including factory processing of the flange portion, the number of workers can be reduced from 800 to about 500, for example. Moreover, by flaring the flanges at the factory and delivering them to the site, the construction period can be further shortened, leading to a reduction in man-hours. In addition, by placing a new pipe on the free bearing via the transport stand, when moving the new pipe on the premises, the flange provided at the end of the pipe does not get in the way, and the pipe moves smoothly. , Work easier.

It is a top view of the premises where piping is installed. It is sectional drawing of the premises where piping is installed. It is explanatory drawing of the bearing apparatus used for the piping replacement | exchange method concerning embodiment of this invention, and has shown the state which mounted | wore the free bearing construction metal fitting. It is explanatory drawing of the bearing apparatus used for the piping replacement | exchange method concerning embodiment of this invention, and has shown the state which removed the free bearing construction metal fitting. It is explanatory drawing of the existing piping installed in the campus. It is a perspective view of the new piping used for the piping replacement | exchange method concerning embodiment of this invention. It is the front view which looked at the state which mounted existing piping directly on the free bearing from the conveyance direction of piping. It is explanatory drawing of the piping replacement | exchange method concerning embodiment of this invention, and has shown the state which removes the existing piping from a campus. It is explanatory drawing of the piping replacement | exchange method concerning embodiment of this invention, and has shown the state which carries in new piping in a campus. It is the side view which looked at the state which mounted new piping on the free bearing via the conveyance stand from the side of the conveyance direction of piping. It is the front view which looked at the state which mounted new piping on the free bearing via the conveyance stand from the conveyance direction of piping.

  Embodiments of the present invention will be described below. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in Figs. 1 and 2, for buildings such as hospitals and schools, and various facilities such as factories, research laboratories, station buildings, airports, etc. 3 is provided. In this premises 3, various pipes a are installed, for example, a cold water pipe, a hot water pipe, a steam pipe, a gas pipe and the like are installed. Further, support posts 4 are arranged at appropriate intervals on the campus 3.

  Various pipes a installed in the premises 3 may need to be replaced due to deterioration due to corrosion, renovation of the machine building 1 or the building building 2, increase / decrease or change of facilities, and the like. For example, a construction for increasing the diameter of a cold water pipe from 300A to 350A through the same route. Further, the extension distance of the premises 3 is, for example, about 200 m, and the pipe a is, for example, 300 m long. Therefore, in the following embodiment, a method for replacing the pipe a1 such as the existing cold water pipe installed in the premises 3 with a new pipe a2 will be described.

  As shown in FIG. 3, the bearing device 10 used in the embodiment of the present invention includes a pair of left and right free bearings 11 that move a pipe a (a1, a2), a bearing base 12 that supports the free bearings 11, A free bearing installation metal 13 for adjusting the angle of the free bearing 11 is provided between the free bearing 11 and the bearing mount 12. The free bearing 11 includes a rotatable ball 15 on the upper surface, and can support the pipe a <b> 1 and the transport frame 40 movably with the ball 15, as will be described later. A bolt 16 is attached to the bottom surface of the free bearing 11, and the bolt 16 is passed through a long hole 17 provided on the top surface of the bearing base 12 and tightened with a nut 18, whereby the free bearing 11 is mounted on the bearing base 12. It is fixed to. For the free bearing 11, for example, an ISB ball bear manufactured by Iguchi Kiko Co., Ltd. can be used.

  As shown in FIG. 3, the free bearing installation metal 13 has a triangular wedge shape. As shown in FIG. 3, the free bearing installation metal 13 is interposed between the free bearing 11 and the bearing base 12, so that the left and right free bearings 11 are connected to each other. The angle can be adjusted to tilt inward. As will be described later, when the existing pipe a1 is removed from the premises 3, as shown in FIG. 3, a free bearing installation metal 13 is interposed between the free bearing 11 and the bearing mount 12, and the left and right free bearings 11 are interposed. The existing pipe a <b> 1 is placed on the ball 15 of the free bearing 11 in a state in which is inclined inward.

  On the other hand, as shown in FIG. 4, the free bearing 11 is placed directly on the upper surface of the bearing mount 12 (without the free bearing mount 13 being interposed), and the bolt 16 is passed vertically through the long hole 17. The free bearing 11 can also be directly fixed to the bearing mount 12 by tightening. As will be described later, when a new pipe a2 is carried into the premises 3, as shown in FIG. 4, the free bearing 11 is directly supported on the bearing mount 12 (without the free bearing mounting metal 13 interposed), and the free bearing A new pipe a <b> 2 is placed on the eleven balls 15 via the transport frame 40.

  In this way, the bearing device 10 has a state in which the free bearing installation metal 13 is interposed between the free bearing 11 and the bearing mount 12 as shown in FIG. 3, and the free bearing 11 as shown in FIG. The state can be appropriately changed to a state in which the bearing base 12 is directly supported (without interposing the free bearing base 13). Since the bolts 16 of the free bearing 11 are passed through the long holes 17 of the bearing mount 12, the free bearing 11 is inclined as shown in FIG. 3 and the free bearing 11 is shown in FIG. It is possible to pass the bolt 16 smoothly through the long hole 17 and fix it with the nut 18 in any state where the bolt 16 is passed vertically through the long hole 17.

  In the embodiment of the present invention, the existing pipe a1 previously installed in the premises 3 is a circular pipe having a flat peripheral surface without a protrusion such as a flange on the peripheral surface. For example, a 300 A pipe is used as the existing pipe a1.

  As shown in FIG. 5, the existing pipe a <b> 1 is fixed by an existing frame 20 constructed on the premises 3. The existing pipe a <b> 1 is placed on the support member 21 and fixed to the existing frame 20. The upper part of the existing pipe a1 is pressed by a U-shaped stopper 22, and both lower ends of the U-shaped stopper 22 are passed through the existing frame 20 and tightened with nuts 23 to The pipe a1 is attached to the support material 21. Further, a heat insulating material (heat insulating sleeper) 24 is mounted around the existing pipe a1.

  In the embodiment of the present invention, as shown in FIG. 6, a new pipe a <b> 2 that is installed on the premises 3 by replacing the existing pipe a <b> 1 is provided with flange portions 31 at both ends of the circular pipe portion 30. The flange portion 31 is provided with a bolt hole 32 for passing a joining bolt (not shown). For the circular pipe portion 30, for example, a 350A pipe is used. The new pipe a <b> 2 is formed by a method in which both ends of the circular pipe part 30 (pipe) are flared at the factory, or the flange part 31 is connected to both ends of the circular pipe part 30 by welding or the like.

  Next, the exchange method according to the embodiment of the present invention will be described in more detail. First, a place for cutting and removing the existing pipe a1 is selected. In this case, it is preferable to select a place that is convenient for carrying out the existing pipe a1 or carrying in the new pipe a2 and is easy to work on. And in the selected place, a chain block (not shown) is installed above the pipe a1.

  Moreover, in the premise 3, the heat insulating material 24 with which the circumference | surroundings of the existing piping a1 were mounted | worn is removed. The heat insulating material 24 may be removed by appropriately cutting the heat insulating material 24 with a cutter and removing it from the existing pipe a1.

  And the bearing apparatus 10 is mounted | worn with the existing piping a1 which peeled off the heat insulating material 24 and was made naked. In this case, as shown in FIG. 7, the bearing mount 12 of the bearing device 10 can be fixed to the existing frame 20 constructed on the premises 3 using bolts 35 or the like. In this way, the bearing device 10 can be attached to the premises 3 using the existing frame (support steel material) 20.

  Further, in the process of removing the existing pipe a1, as described above with reference to FIG. 3, a wedge-shaped free bearing installation metal 13 is interposed between the free bearing 11 and the bearing mount 12, and the left and right free bearings 11 are mounted. The angle is adjusted so as to incline each other. Then, as shown in FIG. 7, the existing pipe a <b> 1 stripped of the heat insulating material 24 is placed directly on the ball 15 of the free bearing 11.

  If the extension distance of the premises 3 is about 200 m, for example, if about 25 bearing devices 10 (about 50 free bearings 11) are attached to the premises 3, the entire existing pipe a1 is replaced by the bearing devices 10. Become supportable. And after supporting the existing piping a1 to the bearing apparatus 10 in this way, the support material 21 and the U-shaped stopper 22 which have fixed the piping a1 to the existing frame 20 are removed.

  Next, as shown in FIG. 7, the existing piping a1 installed in the campus 3 is sequentially cut to an appropriate length and removed from the campus 3. That is, at a place where a chain block (not shown) is installed, the existing pipe a1 is cut to a predetermined length, and the existing pipe a1 cut from the premises 3 is sequentially taken out.

  There are cases where city gas piping or the like is laid on the premises 3. Therefore, it is preferable to use a saver saw 36 or the like in the work of cutting the existing pipe a1 so that fire does not come out. The length of the existing pipe a1 to be cut may be set so that the column 4 does not get in the way when the existing pipe a1 cut from the premises 3 is lifted, for example, cut to a length of about 20 m. To do.

  Then, the cut existing pipe a <b> 1 is lifted by a chain block (not shown) and placed on a carriage 37 disposed in the vicinity of the premises 3. When the existing pipe a1 is lifted, a nylon sling is hung on the pipe a1 and is slowly lifted and placed on the carriage 37 while being supported by an operator. And it puts on the trolley | bogie 37 and moves the existing piping a1 to a desired location.

  In this way, at the place where the chain block (not shown) is installed, the existing pipe a1 is cut by the saver saw 36, the cut existing pipe a1 is placed on the carriage 37 and sequentially carried out, and the existing pipe from the premises 3 is removed. Remove all a1. Since the existing pipe a1 is supported by the bearing device 10, the existing pipe a1 can be sequentially slid to the place where the chain block (not shown) is installed in the premises 3. Then, at the place where the chain block (not shown) is installed, the existing pipe a1 is cut to a desired length by the saver saw 36, and the cut existing pipe a1 is placed on the carriage 37 and carried out. repeat. Thus, the existing pipe a1 can be removed from the premises 3 at the same place where the chain block (not shown) is installed.

  And after removing all the existing piping a1 from the premise 3, next, the new piping a2 is carried in to the vicinity of the premise 3. When carrying in a new pipe a2, as shown in FIG. 9, the new pipe a2 placed on the carriage 37 is moved to the vicinity of the premises 3, and the new pipe a2 is moved to a position where it can be lifted by a chain block (not shown). Let Then, the new pipe a <b> 2 moved to the vicinity of the premises 3 is lifted by a chain block (not shown) and is sequentially lowered to the premises 3.

  When carrying in a new pipe a2, as described above with reference to FIG. 4, the free bearing 11 of the bearing device 10 is directly supported on the bearing mount 12 (without the free bearing mount 13 being interposed). . Then, the new pipe a <b> 2 lowered to the premises 3 is placed on the ball 15 of the free bearing 11 through the transport mount 40 as shown in FIGS. 10 and 11.

  The load capacity of the free bearing 11 is, for example, about 150 kg / 1. On the other hand, if the new pipe a2 is, for example, a 350A pipe, it is about 410 kg including a fixed pipe flange. Therefore, it is sufficient to support the transport frame 40 on which the new pipe a <b> 2 is placed with the four free bearings 11.

  Then, at a position where a chain block (not shown) is installed, new pipes a2 are sequentially carried into the premises 3, the new pipes a2 are joined together, and the joined new pipes a2 are sequentially moved to the premises 3. In this case, as shown in FIG. 9, the new pipes a <b> 2 are joined to each other by abutting the flange parts 31 provided at the ends of two adjacent new pipes a <b> 2, and the bolt holes 32 provided in the flange part 31. The two flange portions 31 are joined to each other through bolts or the like.

  Then, as shown in FIG. 9, the new pipe a2 divided into a plurality of parts and carried in is sequentially carried into the premises 3 at the position where the chain block (not shown) is installed. Then, the new pipes a <b> 2 are joined together and sequentially moved to the premises 3. Thus, by installing the new pipe a2 on the entire campus 3, for example, the existing pipe a1 of 300A can be increased in diameter to the new pipe a2 of 350A.

  And after installing the new piping a2 in the whole premise 3, the support material etc. are attached and the new piping a2 is fixed to the existing frame 20. FIG. Thereafter, air pressure / water pressure tests are conducted to check for leaks in the new pipe a2, and then the heat insulating material is attached, and the construction is completed. For example, in the case of a cold water pipe or the like, final water filling is further performed and delivery is possible.

  According to the replacement method described above, the removal of the existing pipe a1 and the installation of the new pipe a2 can be performed in the same place, so that the work efficiency is improved and the loading / unloading date and loading / unloading space are limited. But it will be possible to construct. In addition, by adopting the so-called “free bearing method” in which the existing piping a1 and the new piping a2 are moved on the premises 3 by using the bearing device 10, the piping movement on the premises 3 is facilitated, further shortening the construction period and reducing the construction cost Reduction can be achieved. For example, the construction can be completed while the cold water stoppage period is short.

  Moreover, when joining new piping a2, it becomes possible to join using a bolt etc. by using the flange part 31 provided in the edge part of piping a2, and a field welding etc. can be abbreviate | omitted. Therefore, the work load is reduced, and the construction can be performed even in the premises 3 where the working environment is not good in a situation where the fire cannot be used such as high temperature and high humidity or welding. Further, flushing accompanying welding is not necessary.

  Moreover, the flare processing and welding work of the flange part 31 can be performed in a factory, and the non-fired construction method construction on the spot becomes possible. Moreover, by flaring the flange portion 31 at the factory and delivering it to the site, the construction period is further shortened, which leads to artificial reduction. Including factory processing of the flange portion 31 by flare processing or the like, the number of workers can be reduced from, for example, about 800 to about 500.

  Since the flange portion 31 is provided in the new pipe a2, the flange portion 31 becomes an obstacle when transported by the bearing device 10 as it is. However, as described with reference to FIGS. By placing the new pipe a2 and supporting it by the free bearing 11, the flange portion 31 does not get in the way, and the new pipe a2 can be smoothly transported on the premises 3, and the work becomes easy. In this embodiment, the example in which the existing pipe a1 having no flange is replaced with a new pipe a2 having the flange portion 31 has been described. According to such an embodiment, the existing pipe a1 without a flange can be sent out as it is placed on the bearing device 10, and the new pipe a2 with the flange portion 31 is carried on the transport gantry 40. It is possible to avoid using the flange portion 31. Moreover, when the conveyance mount 40 is used, it can be set as a flat delivery surface, without using the free bearing mounting metal 13 as previously demonstrated in FIG. However, such a replacement operation of the bearing device 10 (free bearing erected metal 13) may be performed only when necessary in accordance with the presence or absence of the flange 31. For example, when both the existing pipe a and the new pipe a2 have no flange, it is only necessary to always attach the free bearing erection metal 13 to the bearing device 10 and incline the left and right free bearings 11 inward. On the other hand, when both the existing pipe a and the new pipe a2 have flanges, the free bearing erection hardware 13 is always removed from the bearing device 10 to form a flat delivery surface and carried on the carriage 40. .

  The present invention is useful for exchanging various pipes provided on the premises of buildings and various facilities.

a piping a1 existing piping a2 new piping 1 machine building 2 building building 3 premises 4 support 10 bearing device 11 free bearing 12 bearing mount 13 free bearing installation hardware 15 ball 16 bolt 17 long hole 20 existing frame 21 support material 22 stopper 23 Nut 24 Insulating material 30 Circular pipe part 31 Flange part 35 Bolt 36 Saver saw 37 Carriage 40 Transport stand

Claims (5)

A method of replacing existing piping installed on the premises with new piping,
Move the existing piping on the premises, cut the existing piping to a predetermined length at the same place, and sequentially remove the existing piping from the premises,
A new pipe divided into a plurality of parts is joined at the same place, and the new pipe is sequentially moved to the premises.   In the campus, the existing piping is supported by a bearing device, the existing piping is moved on the campus using the bearing device, and the new piping is moved on the campus using the bearing device. Item 2. The pipe replacement method according to Item 1. The bearing device includes a free bearing that moves a pipe, a bearing frame that supports the free bearing, and a free bearing installation metal that is interposed between the free bearing and the bearing frame to adjust an angle of the free bearing. Have
When moving the existing piping, interpose the free bearing installation hardware between the free bearing and the bearing mount,
3. The pipe replacement method according to claim 2, wherein, when a new pipe is moved, the free bearing is directly supported by the bearing base without interposing the free bearing mounting metal.   The pipe replacement method according to claim 3, wherein an existing pipe is directly placed on the free bearing. At the end of the new pipe divided into multiple parts, a flange part for joining the new pipes is provided,
The pipe replacement method according to claim 3, wherein a new pipe is placed on the free bearing via a transport frame.

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