JP2013213539A - In-pipe air discharging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-pipe air discharging method capable of easily and efficiently discharging air staying in a fluid pipe to the outside, without using a special device or the like.SOLUTION: An in-pipe air discharging method discharges staying air 5 stayed in a fluid pipe 1 to the outside of the fluid pipe 1 via communicating holes 3b-3d connecting the inside and outside of the fluid pipe 1. A sliding body 6 slidable with an inner surface of the fluid pipe 1 is introduced into the fluid pipe 1, the sliding body 6 is slid along a pipe conduit toward the communicating hole 3d, the staying air 5 in the fluid pipe 1 is captured on an outer surface of the sliding body 6, and the staying air 5 captured on the outer surface of the sliding body 6, is discharged outside the fluid pipe 1 via the communicating holes 3b-3d.

Description

  The present invention relates to an in-pipe air discharge method for discharging stay air staying in a fluid pipe to the outside of the fluid pipe through a communication hole communicating between the inside and the outside of the fluid pipe.

  A conventional method for exhausting air in a pipe is provided with a bulging chamber section that swells larger than the pipe diameter of the pipe constituting the pipe, and a float valve mechanism provided in a rising pipe section disposed above the bulging chamber section. The fluid flowing in the pipe constituting pipe is caused to flow into the bulging chamber portion to slow down the flow velocity, and at the same time, the fluid staying in the outer peripheral portion in the bulging chamber portion is entrained to cause a disturbance in the flow. Due to the decrease in the flow velocity and the turbulent flow, the air in the fluid is floated upward and discharged to the outside through the float valve mechanism. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2008-256158 (pages 4, 5 and 4)

  However, in Patent Document 1, when the fluid staying in the outer peripheral portion in the bulging chamber portion is entrained, there is a possibility that bubbles or the like may be newly generated by stirring the fluid, and efficiently to the outside. Could not exhaust. In addition, there is a problem in that a process for attaching the bulging chamber portion to the pipe constituting pipe is separately required, and the cost for the operation is increased.

  The present invention has been made paying attention to such problems, and provides an in-pipe air discharge method capable of easily and efficiently discharging the air staying in a fluid pipe without using a special device or the like. The purpose is to do.

In order to solve the above-described problem, the pipe air discharge method of the present invention includes:
In-pipe air discharging method for discharging staying air staying in a fluid pipe to the outside of the fluid pipe through a communication hole communicating inside and outside of the fluid pipe,
A sliding body slidable with the inner surface of the fluid pipe is introduced into the fluid pipe, the sliding body is slid along the pipeline toward the communication hole, and the retained air in the fluid pipe is moved to the outer surface of the sliding body. The trapped air trapped on the outer surface of the sliding body is discharged out of the fluid pipe through the communication hole.
According to this feature, as the sliding body introduced into the fluid pipe is slid along the pipe line toward the communication hole, the stagnant air is captured by the sliding body and sent out to the communication hole. Since the staying air is efficiently discharged to the outside, the exhausting operation can be easily performed. Further, since the staying air is exhausted to the outside by using the communication hole that communicates the inside and the outside of the fluid pipe, no special device is required for exhausting the staying air to the outside of the fluid pipe. Can be suppressed.

The pipe air discharge method of the present invention comprises:
The sliding body sliding along the pipe line toward the communication hole is led out of the fluid pipe through the communication hole.
According to this feature, since the sliding body is led out of the fluid pipe together with the staying air exhausted to the outside through the communication hole, it is not necessary to collect the sliding body from the inside of the fluid pipe, and the operation can be easily performed. At the same time, the accumulated air can be efficiently exhausted without remaining in the fluid pipe.

The pipe air discharge method of the present invention comprises:
The sliding body has a specific gravity lighter than that of the fluid flowing in the fluid pipe.
According to this feature, the sliding body can be slid in the fluid pipe together with the fluid flowing in the fluid pipe only by introducing the sliding body into the fluid pipe, and the sliding body is pressed against the inner surface of the pipe top by buoyancy. The staying air staying on the inner surface of the top of the tube can be reliably captured without escaping.

The pipe air discharge method of the present invention comprises:
The sliding body introduced into the fluid pipe is formed to be approximately the same as the inner diameter of the fluid pipe in the pipe diameter direction and longer than the inner diameter of the fluid pipe in the pipe axis direction. It is said.
According to this feature, the sliding body is formed in the pipe diameter direction to be approximately the same size as the inner diameter of the fluid pipe, so that it covers not only the entire cross section of the fluid pipe and traps stagnant air without leakage, but also in the pipe axis direction. Since the inner diameter of the fluid pipe is formed to be longer than the inner diameter of the fluid pipe, there is no risk that the sliding body that slides on the inner face of the fluid pipe along the pipe will rotate around the axis perpendicular to the pipe axis, and the trapped stay It is possible to prevent the air from flowing back more than the sliding body.

The pipe air discharge method of the present invention comprises:
A plurality of recesses are provided on the outer surface of the sliding body.
According to this feature, since the plurality of recesses are formed on the outer surface of the sliding body, the sliding body slides in the fluid pipe while accommodating the staying air in the recess. Can be efficiently exhausted.

The pipe air discharge method of the present invention comprises:
After the sliding body is slid toward the communication hole, a suction device capable of moving in the fluid pipe and having a suction function is introduced into the fluid pipe.
According to this feature, by introducing the suction device into the fluid pipe, even if small bubbles that cannot be captured and partitioned by the sliding body remain, the bubbles can be sucked.

The pipe air discharge method of the present invention comprises:
The suction device includes an image acquisition unit that acquires an image in the fluid pipe, and an image display unit that displays the image acquired by the image acquisition unit outside the fluid pipe.
According to this feature, by introducing a suction device equipped with an image acquisition means into the fluid pipe, the air bubbles remaining in the fluid pipe after introduction of the sliding body are suctioned while being visually recognized by the image display means provided outside the fluid pipe. Can prevent air bubbles from being lost.

It is a side view which shows the newly installed pipe line in Example 1. FIG. It is a side view which shows the state which is washing the new pipeline. It is a side view which shows the state which has introduce | transduced the sliding body in the fluid pipe | tube. It is a side view which shows the state which the sliding body is sliding along a pipe line. It is a side view which shows the state which introduced the suction device in the fluid pipe | tube in Example 2. FIG. (A) is a top view which shows a suction device, (b) is a side view similarly, (c) is a front view similarly. It is a front view which shows the modification of a sliding body.

  EMBODIMENT OF THE INVENTION The form for implementing the pipe | tube air discharge | emission method which concerns on this invention is demonstrated below based on an Example.

  The pipe air discharge method according to the first embodiment will be described with reference to FIGS. 1 to 4 and FIG.

  FIG. 1 shows a new pipeline Z newly established in a predetermined section in the ground. This new pipeline Z is connected to, for example, an existing fluid pipe network, and fluid flowing through the fluid pipe network is contained in the interior. And a branch pipe portion 2a, 2b, 2c, 2d extending upward from the fluid pipe 1. Further, the upstream and downstream ends of the new pipeline Z are closed by a gate valve (not shown), that is, the new pipeline Z in FIG. It has become. In this embodiment, the fluid flowing through the fluid pipe network flows from the upstream side, which is the branch pipe portion 2a side, to the downstream side, which is the branch pipe portion 2d side.

  The fluid pipe 1 of the present embodiment is made of, for example, ductile cast iron used for waterworks, is formed in a substantially circular shape in cross section, and the inner peripheral surface is covered with a mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. The fluid flowing inside the fluid pipe is not limited to, for example, clean water, but may be gas, liquid mixture of gas or gas and liquid, in addition to industrial water, agricultural water, sewage and the like.

  The branch pipe portions 2 a, 2 b, 2 c, 2 d of the present embodiment are disposed at predetermined intervals in the pipe axis direction of the fluid pipe 1. More specifically, the branch pipe portion 2 a includes a communication hole 3 a that is disposed at the upstream end portion in the newly established pipeline Z and communicates with the inside and outside of the fluid pipe 1. The branch pipe part 2 b is disposed adjacent to the downstream side with respect to the branch pipe part 2 a and includes a communication hole 3 b communicating with the inside and the outside of the fluid pipe 1. The branch pipe portion 2 c is disposed adjacent to the downstream side with respect to the branch pipe portion 2 b and includes a communication hole 3 c that communicates with the inside and the outside of the fluid pipe 1. The branch pipe portion 2d is provided at a downstream end portion in the new pipeline Z and includes a communication hole 3d communicating with the inside and the outside of the fluid pipe 1. Further, a repair valve case 35 in which a repair valve (not shown) that can be opened and closed by an operation portion 36 is connected to the upper flange 21 of each branch pipe portion 2a, 2b, 2c, 2d in a sealed manner. An air valve 4 for discharging air to the outside is attached above the repair valve case 35. In this embodiment, the branch pipe part and the communication hole are extended to four places in the fluid pipe. However, the present invention is not limited to this. For example, the branch pipe part and the communication hole may be provided in one or three places. Moreover, five or more places may be provided, and a desired quantity may be provided. Furthermore, although the air valve 4 is connected to the distal end portion of the branch pipe portion of the present embodiment, an appropriate connection member may be connected. In this case, for example, the connection member is connected to the tube axis of the fluid pipe. It may extend perpendicular to the substantially horizontal direction.

  First, the new pipe line Z is washed. The washing method of the newly established pipeline Z will be described. The air valve 4 of the branch pipe portions 2a and 2d is removed, the repair valve is operated by the operation portion 36, and the communication holes 3a and 3d are opened. Thereafter, a cleaning body 11 for cleaning the inner peripheral surface of the fluid pipe 1 is introduced into the fluid pipe 1 through the communication holes 3a and 3d. The cleaning body 11 of the present embodiment is, for example, a substantially spherical pig having substantially the same diameter as the inner diameter of the fluid pipe 1 or a slightly larger diameter in the natural state, and is formed of a material having relatively elasticity and flexibility. ing. Note that the cleaning body is not limited to this, and a bag body or the like that is inflated by press-fitting air therein may be used.

  Then, as shown in FIG. 2, the gate valve disposed on the upstream side of the new pipeline Z described above is opened. As a result, the fluid flowing through the fluid pipe network flows into the fluid pipe 1 of the new pipeline Z, and the washing body 11 is pushed downstream by the fluid flow and the fluid pressure. Therefore, the cleaning body 11 moves downstream while sliding on the inner peripheral surface of the fluid pipe 1, and the cleaning body 11 polishes the inner peripheral surface of the fluid pipe 1 and collects dust and other contaminants attached to the inner peripheral surface. At the same time, it is led out of the fluid pipe 1 through the communication hole 3d.

  Thus, after the washing pipe 11 has been washed by the washing body 11, the air valves 4 are respectively attached to the upper flanges 21 of the branch pipe portions 2a and 2d, and are arranged on the downstream side of the above-described new pipe Z. The gate valve is opened, and the fluid pipe network and the new pipe line Z are communicated with each other while the air in the new pipe line Z is exhausted out of the fluid pipe 1 by the air valves 4. At this time, in the fluid pipe 1, the air in the new pipe line Z cannot be exhausted from the air valve 4, and the staying air 5 may stay on the inner surface of the top of the pipe in the fluid pipe 1 (see FIG. 3).

  Next, the in-pipe air discharge method of the present invention will be described. As shown in FIG. 3, the staying air 5 staying in the fluid pipe 1 is removed using the sliding body 6 that can slide on the inner surface of the fluid pipe 1. In this method, the fluid pipe 1 is discharged out of the fluid pipe 1 through the communication holes 3a, 3b, 3c, and 3d communicating with each other. The sliding body 6 of this embodiment has an inner surface formed of rubber or the like and has elasticity, and an outer surface is formed of a woven fabric or the like. When the sliding body 6 slides with the inner surface of the fluid pipe 1, the inner surface of the fluid pipe 1 is covered. It is hard to hurt. Further, the sliding body 6 has a specific gravity that is lighter than the fluid flowing in the fluid pipe 1.

  First, the air valve 4 of the branch pipe portions 2a and 2d is removed, and the sliding body 6 is inserted into the branch pipe portion 2a through the communication hole 3a opened by a repair valve (not shown). At this time, the communication hole 3d is closed by the repair valve. Thereafter, press fitting means such as a pump (not shown) is connected to the branch pipe portion 2a through the repair valve case 35, and fluid is press-fitted into the fluid pipe 1 by the press fitting means. Along with this, the sliding body 6 is pushed out and introduced into the fluid pipe 1. The sliding body 6 introduced into the fluid pipe 1 is formed to be approximately the same size as the inner diameter of the fluid pipe 1 in the pipe diameter direction of the fluid pipe 1, and from the inner diameter of the fluid pipe 1 in the pipe axis direction of the fluid pipe 1. Is also formed long (see FIG. 4).

  Further, as shown in FIG. 4, the communication hole 3d of the branch pipe portion 2d is opened. Accordingly, the fluid flowing in the fluid pipe 1 generates a discharge flow and a pressure difference that are discharged out of the fluid pipe 1 through the communication hole 3d of the branch pipe portion 2d. As described above, since the sliding body 6 has a specific gravity lighter than the fluid flowing in the fluid pipe 1, the sliding body 6 multiplies the discharge flow and pressure difference toward the outside of the fluid pipe 1, thereby sliding the sliding body 6. The trapped air 5 in the fluid pipe 1 is captured on the outer surface of the fluid pipe 1 and slides along the pipe line toward the communication hole 3d.

  Thus, by only introducing the sliding body 6 into the fluid pipe 1, the sliding body 6 can slide in the fluid pipe 1 together with the fluid flowing in the fluid pipe 1, and the sliding body 6 can also be buoyant by the buoyancy. Therefore, the staying air 5 staying on the inner surface of the top portion of the pipe can be reliably captured without escaping. Furthermore, since the sliding body 6 is formed in the pipe diameter direction to be approximately the same size as the inner diameter of the fluid pipe 1, it can cover almost the entire cross section of the fluid pipe 1 and capture the stagnant air 5 without leaking. Since the fluid pipe 1 is formed to be longer than the inner diameter of the fluid pipe 1, there is no risk that the sliding body 6 that slides on the inner surface of the fluid pipe 1 along the pipe line rotates around the orthogonal axis of the pipe axis. It is possible to prevent the trapped staying air 5 from flowing backward from the sliding body 6.

  When the sliding body 6 that has captured the staying air 5 reaches the branch pipe portion 2 b, the staying air 5 that has been trapped by the sliding body 6 is sent into the branch pipe portion 2 b and passes through the communication hole 3 b and the air valve 4. Exhausted out of the fluid pipe 1. Similarly, when the sliding body 6 that has captured the staying air 5 reaches the branch pipe portion 2c, the staying air 5 that has been trapped by the sliding body 6 is sent out into the branch pipe portion 2c, and the communication hole 3c and the air The fluid is exhausted outside the fluid pipe 1 through the valve 4. After that, similarly, when the sliding body 6 that has captured the staying air 5 reaches the branch pipe portion 2d, the staying air 5 that has been trapped by the sliding body 6 so far is sent into the branch pipe portion 2d and passes through the communication hole 3d. Exhausted out of the fluid pipe 1. In short, the stagnant air 5 is captured by the sliding body 6 and sent out to the communication holes 3b, 3c, and 3d, and the stagnant air 5 is efficiently discharged to the outside through the communication holes 3b, 3c, and 3d. It can be performed.

  Then, the sliding body 6 that has slid along the pipe line toward the communication hole 3d is led out of the fluid pipe 1 through the communication hole 3d. Thereby, since the sliding body 6 is led out of the fluid pipe 1 together with the staying air 5 exhausted to the outside through the communication hole 3d, it is not necessary to collect the sliding body 6 from the fluid pipe 1 and work can be easily performed. While being able to perform, it can exhaust efficiently, without the residence air 5 remaining in the fluid pipe | tube 1. FIG.

  As described above, the in-pipe air discharge method of the present invention discharges the staying air 5 staying in the fluid pipe 1 to the outside of the fluid pipe through the communication holes 3b, 3c, 3d communicating with the inside and outside of the fluid pipe 1. In this method, a sliding body 6 slidable with the inner surface of the fluid pipe 1 is introduced into the fluid pipe 1, and the sliding body 6 is slid along the pipeline toward the communication hole 3d. The staying air 5 in the fluid pipe 1 is captured on the outer surface of the sliding body 6, and the staying air 5 captured on the outer surface of the sliding body 6 is discharged out of the fluid pipe 1 through the communication holes 3b, 3c, and 3d. According to this, as the sliding body 6 introduced into the fluid pipe 1 is slid along the pipe line toward the communication hole 3d, the stagnant air 5 is captured by the sliding body 6 and the communication holes 3b, 3c. 3d, and the staying air 5 is efficiently discharged to the outside through the communication holes 3b, 3c, and 3d, so that the exhausting operation can be easily performed. Furthermore, since the staying air 5 is exhausted to the outside by using the communication holes 3b, 3c, and 3d communicating with the inside and outside of the fluid pipe 1, there is a special case for exhausting the staying air 5 to the outside with respect to the fluid pipe 1. An apparatus is not required and the cost can be suppressed.

  The sliding body 6 of this embodiment has an inner surface made of rubber or the like and an outer surface made of woven fabric or the like. As a modification of the sliding body of the present invention, as shown in FIG. The sliding body 6 ′ may be covered with an elastic member 7 whose outer surface is formed in a substantially lattice shape, and the elastic member 7 may form a plurality of recesses 7a on the outer surface of the sliding body 6 ′. According to this, the sliding body 6 ′ slides in the fluid pipe 1 while accommodating the staying air 5 in the recess 7 a, so that the staying air 5 can be prevented from being missed and efficiently exhausted.

  Next, the pipe air discharge method according to the second embodiment will be described with reference to FIGS. 5 and 6. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  In the pipe air discharge method of the present embodiment, the slide body 6 is slid toward the communication hole 3d as in the above-described embodiment, and then the fluid pipe 1 can be moved in the fluid pipe 1 and the suction function can be achieved. The provided suction device 10 is introduced. As shown in FIG. 6, the suction device 10 includes a suction portion 10a provided at the tip portion and provided with a pump or the like not shown therein, and extends from the rear end portion of the suction portion 10a to the outside through the communication hole 3a. A suction hose 10b, a camera unit 10c which is an image acquisition means of the present invention for acquiring an image in the fluid pipe 1 attached to the suction unit 10a, and externally from the rear end of the camera unit 10c through the communication hole 2a. An image acquired by the camera unit 10c, which is provided outside the fluid pipe 1, and a weight 10f which is a relatively heavy object provided on the side of the distal end facing the suction unit 10a. And a monitor unit 10e which is an image display means of the present invention.

  As shown in FIG. 5, the state inside the fluid pipe 1 is confirmed from the outside of the fluid pipe 1 by introducing the suction device 10 and projecting the image inside the fluid pipe 1 acquired by the camera section 10c on the monitor section 10e. be able to. At this time, for example, even if small bubbles 15 that are not captured and partitioned by the sliding body 6 may remain in the fluid pipe 1, the bubbles 15 are sucked by the suction portion 10a, and the fluid pipe is passed through the suction hose 10b. It can be exhausted outside. Furthermore, since the image of the inside of the fluid pipe 1 is acquired by the camera unit 10c and the bubble 15 can be sucked while being visually recognized by the monitor unit 10e provided outside the fluid tube 1, it is possible to prevent the bubble 15 from being dropped. Further, since the weight 10f provided at the tip of the suction device 10 is located on the lower side, the suction part 10a on the side opposite to the weight 10f is located on the upper side, that is, on the side close to the inner surface of the top of the tube. The air bubbles 15 remaining on the inner surface of the top of the tube can be reliably sucked.

  In this embodiment, the suction part 10a is provided with a suction hose 10b and exhausts the bubbles 15 to the outside via the suction hose 10b. However, the present invention is not limited to this, and only the suction part is introduced into the fluid pipe. Alternatively, the air bubbles may be taken into the suction part and led out of the fluid pipe together with the air bubbles taken in by the suction part.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the sliding body 6 slides in the fluid pipe 1 by multiplying the fluid flowing in the fluid pipe 1. However, the present invention is not limited to this, and an operating means that allows the sliding body to be operated from the outside. It is also possible to slide inside the fluid pipe by operating the sliding body. The sliding body 6 is introduced through the communication hole 3a and the sliding body 6 is led out from the communication hole 3d. However, the present invention is not limited to this, and the sliding body is introduced into the fluid pipe from the predetermined communication hole, and stagnant air is formed on the outer surface. Then, the sliding body may be moved to the predetermined communication hole by the operation means and led out from the communication hole.

  Further, for example, in the above-described embodiment, the sliding body 6 is formed so as to be approximately the same as the inner diameter of the fluid pipe 1 in the pipe diameter direction and longer than the inner diameter of the fluid pipe 1 in the pipe axis direction. As long as the moving body slides on the inner surface of the fluid pipe and captures the staying air, the moving body may have, for example, a substantially spherical shape, or various shapes having a larger cross section than the flow down section of the fluid pipe in a natural state. And may be elastically contracted along the flow-down cross section of the fluid pipe and introduced into the fluid pipe. In addition, the sliding body 6 of the present embodiment has an inner surface made of rubber or the like and has elasticity, and an outer surface is made of a woven fabric or the like. The sliding body may be made of various resin materials or sponge materials, for example. Or a bag-like body that is inflated by injecting air into the inside.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2a-2d Branch pipe part 3a-3d Communication hole 4 Air valve 5 Stagnant air 6, 6 'Slide body 7 Elastic member 7a Recessed part 10 Suction device 10a Suction part 10c Camera part (image acquisition means)
10e Monitor unit (image display means)
11 Cleaning body 15 Air bubbles

Claims (7)

In-pipe air discharging method for discharging staying air staying in a fluid pipe to the outside of the fluid pipe through a communication hole communicating inside and outside of the fluid pipe,
A sliding body slidable with the inner surface of the fluid pipe is introduced into the fluid pipe, the sliding body is slid along the pipeline toward the communication hole, and the retained air in the fluid pipe is moved to the outer surface of the sliding body. A method for exhausting air in a pipe, wherein the trapped air trapped on the outer surface of the sliding body is discharged out of the fluid pipe through the communication hole.   2. The pipe air discharge method according to claim 1, wherein the sliding body that has slid along the pipeline toward the communication hole is led out of the fluid pipe through the communication hole.   3. The pipe air discharge method according to claim 1, wherein the sliding body has a specific gravity lighter than that of the fluid flowing in the fluid pipe.   The sliding body introduced into the fluid pipe is formed to be approximately the same as the inner diameter of the fluid pipe in the pipe diameter direction and longer than the inner diameter of the fluid pipe in the pipe axis direction. The method for exhausting air in a pipe according to any one of claims 1 to 3.   5. The pipe air discharge method according to claim 1, wherein a plurality of recesses are provided on an outer surface of the sliding body.   6. A suction device capable of moving through the fluid pipe and having a suction function is introduced into the fluid pipe after the sliding body is slid toward the communication hole. The air discharge method in a pipe | tube as described in 2.   The said suction device is provided with the image acquisition means which acquires the image in a fluid pipe | tube, and provided the image display means which displays the image acquired by the said image acquisition means outside a fluid pipe | tube. How to discharge air in the pipe.

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