JP2008157703A - Water-tightness testing device for existing pipe, water-tightness testing system for existing pipe using the same, and water-tightness testing method for existing pipe using water-tightness testing device for existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a light-weighted water-tightness testing device easy to be operated and carried for an existing pipe, capable of applying high pressure onto an inner circumferential face of the existing pipe, for the purpose of inspecting an intrusion and an ejection in the existing pipe, a system using the water-tightness testing device for the existing pipe, and a water-tightness testing method for the existing pipe. <P>SOLUTION: The water-tightness testing device 10 for the existing pipe 20 is provided to cover the inner circumferential face 20a of the existing pipe 20 with an annular coating 12. The device 10 has a sleeve 16 installed diameter-expandably in an inside of the annular coating 12, and for bringing a projected close contact part 14 of the annular coating 12 into contact with the inner circumferential face 20a of the existing pipe 20, and a diameter expansion means 18. The diameter expansion means 18 has a body part 24 installed in an inside of the sleeve 16, the moving bodies 26 disposed in every prescribed interval in the body part 24, and provided movably along an circumferential face direction of the sleeve 16, and the sleeve 16 is diameter-expanded by the moving along the sleeve 16 circumferential face direction of the moving bodies 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an existing pipe water tightness test apparatus, an existing pipe water tightness test system, and an existing pipe water tightness test method using the existing pipe water tightness test apparatus for testing the water tightness of existing pipes.

  In general, fume pipes, ceramic pipes, rigid polyvinyl chloride pipes, etc. are widely used for existing pipes (ducts) buried underground. These existing pipes are normally buried in the ground, and, for example, short pipes (for example, earth pipes) formed individually are joined together at their ends.

  FIG. 13 is a diagram illustrating a state in which the short tubes are joined together at the end portions. As shown in the figure, the short tube 100 (short tubes 100-1 and 100-2) is formed such that the inner diameter of one end portion 100b thereof is slightly larger than the outer diameter of the other end portion 100a. Then, the other end portion 100a of the short tube 100-1 is fitted into one end portion 100b of the short tube 100-2 in a state where a rubber ring 102 formed of an elastic material such as rubber is interposed therebetween. A portion (joint portion) is formed. Thereby, the watertightness in the joining location of the short pipe 100 which forms an existing pipe is ensured. However, due to various factors, intrusion of groundwater or ejection of water pumped through the pipe as described below may occur due to cracks or defects (losing or cutting) of the rubber ring 102.

  Here, in the existing pipe described above, the pressure of the fluid flowing inside the existing pipe is lower than the pressure outside the existing pipe, and the pressure of the fluid flowing inside the existing pipe exists outside the existing pipe. There is an “inner pressure pipe” that is higher than the pressure of soil or water. For example, when a malfunction or crack of a rubber ring occurs due to a shift between sewer pipes, underground water, earth and sand, etc. existing outside the pipe enter the existing pipe. In this case, a change occurs in the ground around the pipe, which causes the hollowing out of the soil, the ground subsidence, or the occurrence of a collapse accident around the place where the penetration into the existing pipe occurs. In addition, the amount of water flowing inside the existing pipe is increased by the intrusion water, and the treatment capacity of the treatment facility of the water flowing through the existing pipe is pressed, so that the cost of treating the flowing water increases.

  On the other hand, when a crack or the like occurs in the internal pressure pipe, a situation occurs in which flowing water inside the pipe is ejected to the outside of the pipe. When this eruption occurs, excess water overflows around the pipe and flows out of the earth and sand, resulting in a sinking accident. Moreover, the situation where the planned water volume which a pipe | tube conveys originally is not achieved and the original function of a pipe | tube cannot be demonstrated is also assumed. For this reason, in any case of a sewer pipe or the like and an internal pressure pipe, it is an important inspection item to confirm the water tightness of the pipe joint or the like. In particular, if the amount of water sent to the buried pipe is further increased from the planned quantity of water, or if there is a problem such as environmental protection around the place where the buried pipe is installed, it is necessary to accurately perform the water tightness test on the existing pipe. There is.

  Here, as a method for inspecting the water tightness of the existing pipe, when the pipe diameter is 800 mm or more, a person enters the existing pipe, and water is submerged from a crack formed in the joint portion of the existing pipe or the inner peripheral surface of the pipe. In general, visual inspection is performed.

  Patent Document 1 discloses another technique for inspecting water immersion from a joint portion of an existing pipe buried in the ground. The technique disclosed in this document uses the pressure resistance test apparatus (10) illustrated in FIGS. In this test apparatus (10), first, a sleeve (12) formed of rubber or the like is disposed inside the pipe joint (see FIGS. 3 and 4). Next, the band-shaped member (21) formed of a steel plate or the like is disposed from the inside of the sleeve (12) (in the same document, the sleeve (12) is formed of rubber, for example). Furthermore, a structural chain (25) capable of a predetermined diameter expansion operation is arranged inside the band-shaped member (21), and the diameter of the structural chain (25) is expanded by the piston cylinder (28), so that the band-shaped member (21). And the sleeve (12) are pressed against the inner peripheral surface of the existing pipe. Thereby, a sealed space is formed between the sleeve (12) and the joint portion of the existing pipe, and water tightness is ensured. Then, a fluid pressure test is performed in which a fluid is sealed in the sealed space, a pressure is applied, and water tightness is inspected.

  Patent Document 2 discloses a technique for covering an existing pipe inner wall as a water stop means for an existing pipe. The repair covering body (C) disclosed in the same document is provided with an annular elastic sheet member (21) on the pipe inner peripheral surface (1a) as shown in FIG. A cylindrical sleeve (S) (in this document, the sleeve (S) is formed of a metal such as stainless steel) is disposed inside the sheet member (21). And in this state, the sleeve (S) is expanded in diameter (increasing its diameter), thereby forming a sealed portion between the elastic sheet member (21) and the pipe inner peripheral surface (1a), It is intended to stop the flooded parts of existing pipes. Thus, appropriate repair becomes possible by giving a water stop means to the pipe line 1.

JP 2005-214898 A JP 2003-130282 A

  In the case of an internal pressure pipe, it is difficult to determine whether the existing pipe joint or crack has a water tightness with respect to the internal water pressure by visual inspection. Similarly, even in the case of a sewer pipe or the like, watertightness cannot be confirmed accurately by visual observation.

  With the technique disclosed in Patent Document 1, a quantitative water tightness test using a pressure test device is possible. For this reason, a water tightness test using such a pressure test device is often applied to the water tightness check of existing pipes. However, in order to increase the diameter of the structural chain described above, the power of the hydraulic mechanism is usually required, and the entire apparatus is large, and the weight is heavy and workability is deteriorated. Therefore, much labor is required for inspection work. Further, the reliability of enclosing a high-pressure fluid in the sealed space is not high.

  The covering for repair described in Patent Document 2 enables appropriate repair of existing pipes. However, when a high-pressure water-tightness test is performed on the sealed part formed between the repair covering and the existing inner peripheral surface of the pipe, it has been confirmed by experiments that the sealed fluid leaks from the sealed part. Yes. Therefore, although the repair covering can be appropriately repaired, it is difficult to use it for a watertight test at a high pressure as it is. On the other hand, from the viewpoint of the environment and the like, it is necessary to confirm the water tightness of the existing pipe buried underground. In addition, it is pointed out that in any of the construction methods, the water-tightness confirmation method is a record determination by writing or taking a photograph of the measured value, and lacks accuracy.

  An object of the present invention is to accurately inspect the water tightness of a buried existing pipe, so that a high pressure can be applied to the inner peripheral surface of the existing pipe, and the existing pipe water tightness that is lightweight and easy to operate and carry. The purpose is to provide test equipment at a low cost. An existing pipe water-tightness test system that uses an existing pipe water-tightness test apparatus and has an easy configuration and enables accurate measurement is provided at a relatively low cost. Further, the existing pipe water-tightness test apparatus according to the present invention is provided. It is to provide an existing pipe water tightness test method that can be easily and effectively used.

The existing pipe water tightness test apparatus according to claim 1 is:
A part of the inner peripheral surface of the existing pipe is covered with an annular covering provided with protruding contact portions on both edges of the outer peripheral surface, and the outer periphery of the annular covering is brought into close contact with the inner peripheral surface of the existing pipe. In the existing pipe water tightness test apparatus for inspecting the water tightness of the existing pipe by sealing a fluid in a sealed state formed between a surface and an inner peripheral surface of the existing pipe in a pressurized state, the annular covering body A sleeve having a substantially cylindrical shape that is installed inside the tube so as to be capable of expanding the diameter, presses the inner peripheral surface of the annular covering body in an expanded state, and makes the annular covering member closely contact the inner peripheral face of the existing pipe; And a movable body installed at predetermined intervals on the main body portion so as to be movable toward the inner circumferential surface of the sleeve, and toward the inner circumferential surface of the sleeve. A diameter expanding means for performing a diameter expanding operation of the sleeve by the movement of And butterflies.

  With this configuration, the moving body of the diameter expanding means moves and presses the inner peripheral surface of the sleeve, and thus the sleeve is expanded and reinforced. In this expansion and reinforcement, since the moving body directly presses the inner peripheral surface of the sleeve, even if pressure is applied to the sealed space in order to perform a water tightness test, it is caused by this pressure. The bending and lifting of the sleeve are reliably prevented. In this way, the sleeve is not deformed in the water tightness test, and the state in which the annular covering body covers and seals the existing pipe inner peripheral surface is reliably maintained. Therefore, it is possible to perform a water tightness test at a higher pressure. Moreover, since the apparatus does not increase in size and complexity as a whole, it is possible to facilitate transportation and reduce the cost.

The existing pipe water tightness test apparatus according to claim 2 is:
The main body portion of the diameter expanding means includes a frame body formed in a substantially circular shape, and a female screw portion provided in the frame body at predetermined intervals and extending in a radial direction of the frame body, The moving body is formed as a bolt body and is screwed into the female screw portion to move in the sleeve inner circumferential direction.

  By using such a frame body, the main body portion can be formed in a light weight, and further, a strong structure that does not deform with respect to the force with which the moving body presses the inner circumferential surface of the sleeve can be obtained. Then, the bolt body (moving body) in a screwed state with the female screw portion is rotated to perform the above movement, and the sleeve inner peripheral surface is pressed by the tip portion. Therefore, the moving body can press the sleeve with a strong pressing force, and further fine adjustment of the moving amount of the moving body is facilitated.

The existing pipe water tightness test apparatus according to claim 3 is:
A tip portion of the moving body in the moving direction is formed in a substantially hemispherical shape.

  As described above, since the tip of the moving body is formed in a substantially hemispherical shape, even when the angle of pressing the sleeve inner peripheral surface of the moving body is slightly deviated, stable pressing to the sleeve inner peripheral surface is possible. A state can be formed.

The existing pipe water tightness test apparatus according to claim 4 is:
A plurality of the frame bodies of the main body portion of the diameter expanding means are arranged to face each other substantially in parallel at a predetermined interval.

  Thereby, the moving bodies provided in the frame bodies connected to each other press the sleeves. Therefore, the inner peripheral surface of the sleeve can be pressed uniformly over a wide range. In addition, the circular frame bodies are configured to support each other, and the inner diameter of the sleeve can be uniformly pressed in a stable state without causing a positional shift or the like.

The existing pipe water tightness test apparatus according to claim 5 is:
The protruding contact portion of the annular covering is formed such that a plurality of rows of protrusions continuous in the circumferential direction of the annular covering are inclined inward in the width direction of the annular covering. And

  The protrusion is compressed and pressed in the inclined direction during the water tightness test. Since a high pressure is applied to the sealed space, the protruding object is urged in a direction to rise from a state where it is compressed and pressed in the inclined direction. Therefore, even if some unevenness is formed on the inner peripheral surface of the existing pipe, the projecting object and the existing inner peripheral surface of the recess are in strong contact with each other in the recess, and the state where the inner peripheral surface is sealed is maintained. Thus, a sealed space for inspection can be reliably formed even on the inner peripheral surface of the existing pipe on which some unevenness is formed.

The existing pipe water tightness test apparatus according to claim 6 is:
The width of the annular cover and the sleeve and the height of the projecting contact portion so that the sealed space is large enough to cover the water stop means provided on the inner peripheral surface of the existing pipe for repairing the existing pipe. Is set.

  The water stop means is provided for repairing a crack or the like already occurring in an existing pipe to stop the water, but the sealed space should be sized to cover the water stop means. Thus, it is possible to perform a function test on the water tightness of the water stopping means applied to the existing pipe.

The existing pipe water tightness test system according to claim 7 is:
A sealed space formed between the existing pipe water tightness test apparatus according to any one of claims 1 to 6, and the annular covering of the existing pipe water tightness test apparatus and an inner peripheral surface of the existing pipe. A fluid supply device that supplies a fluid for inspection to the detector, a detector that supplies a predetermined amount of the fluid to the sealed space, measures a pressure change after the supply is stopped, and generates a measurement signal; and And a signal processing device for processing the measurement signal from the device and outputting the processed data and recording over time.

  Thereby, the system which can utilize effectively the function of the existing pipe water-tightness test apparatus of Claims 1-6 is provided. That is, a fluid for inspection is supplied to a sealed space formed between the annular covering and the inner peripheral surface of the existing pipe, and the flow rate and pressure change of the fluid are measured. Is to inspect. Therefore, it is possible to grasp the status of existing pipes and the like from the pressure change state.

The existing pipe water tightness test method according to claim 8 is:
The apparatus carrying-in process of carrying in the existing pipe water tightness test apparatus according to any one of claims 1 to 6 into the existing pipe in a state where the constituent members of the existing pipe water tightness test apparatus are separated from each other; The sleeve is installed inside the annular covering, the sleeve is expanded by the diameter expanding means, a part of the inner peripheral surface of the existing pipe is covered with the annular covering, and the outer peripheral surface of the annular covering A device installation step for forming a sealed space with the inner peripheral surface of the existing pipe, a fluid supply step for supplying an inspection fluid to the sealed space until a predetermined fluid pressure is reached, and a fluid after the supply is stopped A fluid pressure measuring step for measuring the pressure change of the fluid, a recording step for recording the measured pressure change over time, and a determination step for determining the water tightness of the existing pipe from the measurement recording result of the fluid pressure. It is characterized by having.

  As described above, the water tightness of the existing pipe can be quickly inspected by an easy procedure while effectively utilizing the functions of the existing pipe water tightness test apparatus according to claims 1 to 6. Moreover, since the existing pipe water-tightness test apparatus is carried into the existing pipe in a state where the respective constituent members are separated from each other, the apparatus can be easily carried in and installed.

  According to the water tightness test apparatus, the existing pipe water tightness test system, and the existing pipe water tightness test method according to the present invention, the water tightness of the existing pipe can be accurately inspected with a simple configuration. And the high water-tightness testing apparatus which is lightweight and easy to carry and install can be provided at low cost. Furthermore, by using the existing pipe water tightness test apparatus, the existing pipe water tightness test system can be configured easily and relatively inexpensively, and the existing pipe water tightness test system can be easily and accurately performed. .

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view illustrating the configuration of an existing pipe water tightness test apparatus according to the present invention. As shown in the figure, the existing pipe water tightness test apparatus 10 is formed of an elastic material (for example, rubber), and has an annular covering body 12 provided with protruding contact portions 14 on both edges of the outer peripheral surface, and a rigid body. And a substantially cylindrical sleeve 16 that expands the diameter within a predetermined range, and a diameter-expanding means 18 that has the same rigidity and expands the sleeve 16. Among these components, the annular covering 12 is installed at a test object location inside the existing pipe 20 having a substantially circular cross section, and the sleeve 16 is installed inside the annular covering 12 so that the diameter can be increased. is there.
Here, the annular covering body 12 is configured as an annular body having a predetermined width, and the projecting and adhering portions 14 are formed so as to project from both edges of the outer periphery as described above.

  The diameter expanding means 18 is mainly composed of a main body portion 24 and a moving body 26 that moves within a predetermined range, and these are made of steel. The main body portion 24 has a frame body 24a and a female screw portion 24b formed in a substantially circular shape. The female screw portion 24b is provided in the frame body 24a at an entire circumference (only part of which is shown in FIG. 1) at predetermined intervals, and each is set so as to extend in the radial direction of the frame body 24a.

  The moving body 26 is formed as a substantially rod-shaped bolt body composed of a male screw portion 26a and a head portion 26b provided at an end of the male screw portion 26a. Here, the front end portion 26c of the male screw portion 26a is formed so as to protrude slightly in a substantially hemispherical shape. The moving body 26 is provided on the main body portion 24 by screwing the male screw portion 26a with the female screw portion 24b. By rotating the head portion 26b, the distal end portion 26c is moved in the radial direction of the frame body 24a. It is configured to move. Thereby, in a state where the main body portion 24 is disposed inside the sleeve 16 formed in a substantially cylindrical shape, the moving body 26 moves radially, contacts and presses the inner peripheral surface of the sleeve 16, and the sleeve 16 described above. The diameter is expanded. As a result, the protruding contact portion 14 of the annular covering 12 is brought into contact with the inner peripheral surface 20a of the existing pipe 20 or strongly pressed, and the outer peripheral face of the annular covering 12 and the inner peripheral face 20a of the existing pipe 20 are A closed space is formed between the two. A test fluid (for example, water) is sealed in the sealed space at a predetermined pressure, and a necessary water tightness test is performed. As described above, the sealed space is formed by the annular covering 12 and the inner peripheral surface 20a of the existing pipe 20. And the protrusion contact | adherence part 14 will be located in the both ends (both edges) of sealed space. That is, the position where the projecting and adhering portion 14 is provided on the annular covering 12 is also the position where both ends of the sealed space for inspection formed by pressing the annular covering 12 against the inner peripheral surface 20a are formed. is there.

  FIG. 2 is an explanatory diagram of the annular covering 12. In the drawing, a cross-section in the width direction of the annular covering 12 is shown. In the present embodiment, the projecting and adhering portions 14 are arranged in a plurality of rows (on both edges) continuous in the circumferential direction of the annular covering 12. 4 rows of protrusions 14a. What is characteristic is that the shape of the protrusion 14 a has a shape inclined inward in the width direction of the annular covering 12.

  With this configuration, when the annular covering 12 is pressed against the existing pipe 20 by the sleeve 16, the protrusion 14 a is compressed and pressed in a state where the tip end portion is directed inward in the width direction of the annular covering 12. When a water tightness test is performed, a high pressure is applied to the sealed space formed between the annular covering 12 and the inner peripheral surface 20a of the pipe 20. For this reason, the protrusion 14a is urged in the direction of rising from the above-described compressed and pressed state. Therefore, even when the inner circumferential surface 20a of the existing pipe 20 is uneven, the projection 14a and the inner circumferential surface 20a are strongly contacted and sealed in the concave portion, so that the tight contact state is ensured. Maintained.

  FIG. 3 is an explanatory diagram of the sleeve 16. In the present embodiment, the sleeve 16 is foldable, and the sleeve 16 includes three constituent members 16-1, 16-2, and 16-3. These are made of steel. The constituent members 16-1, 16-2, and 16-3 can be made of various materials such as aluminum alloy and resin in addition to steel. Here, the end portions of the constituent member 16-1 and the constituent member 16-2 and the end portions of the constituent member 16-2 and the constituent member 16-3 are connected to each other by a hinge 22. And each component 16-1, 16-2, 16-3 has the structure which can rotate freely centering | focusing on the site | part connected with the hinge 22. As shown in FIG. Then, the constituent members 16-1, 16-2, 16-3 in a folded state are expanded, and the ends of the constituent members 16-1 and 16-3 are aligned with each other, so that the sleeve 16 has a substantially cylindrical shape. It is formed.

  With the above configuration of the sleeve 16, the sleeve 16 can be folded and easily handled when transported or carried into the existing pipe 20.

  FIG. 4 is an enlarged view of a main part of the diameter expanding means 18. As illustrated, the female screw portion 24b is provided such that the female screw portions 24b adjacent to each other are alternately positioned on the front surface and the back surface of the frame body 24a.

  With the configuration of the diameter expanding means 18 of the present embodiment, the moving body 26 moves by rotating the moving body (bolt body) 26 screwed into the female screw portion 24b. And the front-end | tip part 26c of the moving body 26 contact | abuts substantially perpendicularly to the internal peripheral surface of the sleeve 16 on extension of a moving shaft. That is, the moving body 26 has a configuration in which a distal end portion 26c that contacts the sleeve 16 is provided on the center line L of the male screw portion 26a serving as a moving axis.

  With this configuration, most of the force that acts on the moving body 26 in the pressing of the inner peripheral surface of the sleeve 16 of the moving body 26 directly acts on the moving shaft (male screw portion 26a) of the moving body 26 in the length direction thereof. It will be a thing. Therefore, even if a strong pressing force is applied to the moving body 26, the moving body 26 is not deformed. Accordingly, the inner peripheral surface of the sleeve 16 can be stably pressed. As a result, when a pressure is applied to the sealed space in order to perform a watertightness test, the sleeve 16 can be reliably prevented from being bent or lifted due to the pressure. For example, since the moving body 26 is not deformed even when a high pressing force is applied, the shape of the sleeve 16 pressed by the moving body 26 is maintained without being deformed in the water tightness test. Therefore, the pressing state to the inner peripheral surface 20a of the existing pipe 20 of the annular covering 12 is also maintained. In this way, the hermeticity of the sealed space is maintained, and the pressure required to perform the water tightness test can be stably applied to the sealed space.

  In addition, the moving body 26 is formed as a bolt body, and the moving body 26 that is screwed with the female screw portion 24b moves by rotating, so that fine adjustment of the moving amount of the moving body 26 is facilitated. Furthermore, since the tip end portion 26c is substantially hemispherical, the inner peripheral surface of the sleeve 16 is even when the angle at which the inner peripheral surface of the sleeve 16 of the moving body 26 is pressed slightly deviates from the original pressing angle. A stable pressing state can be formed.

  FIG. 5 is a view (shown as a cross section) illustrating a state in which the sleeve 16 and the diameter expanding means 18 are used and the annular covering 12 is pressed against the inner peripheral surface 20a of the existing pipe 20. In the present embodiment, the sleeve 16 is pressed by the moving body 26 on both surfaces of the frame body 24a of the diameter expanding means 18. The existing pipe water tightness test device 10 is installed in such a state. In the drawing, the part indicated by the two-dot chain line is a fluid injection plug 30 made of rubber attached to the through hole formed in the intermediate plate 34, the sleeve 16 and the annular cover 12. It will be described later. In the present embodiment, an intermediate plate 34 formed of an elastic member such as rubber is interposed between the moving body 26 and the sleeve 16. The sleeve 16 may be directly pressed.

  FIG. 6 is a perspective view for explaining another embodiment of the diameter expanding means. Here, the same elements as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. The diameter expanding means 38 of the present embodiment has a pair of frame bodies 36-1 and 36-2 having the same configuration as the frame body 24a of the embodiment shown in FIG. Used in combination in a parallel state. The frame bodies 36-1 and 36-2 are connected to each other using the three connecting plates 36b at a predetermined interval. Furthermore, female screw portions 36a are provided on the opposing sides of the frame bodies 36-1 and 36-2, and the moving body 26 is screwed into the female screw portions 36a. Here, the distance between the frame bodies 36-1 and 36-2 can be appropriately adjusted by selecting the connecting plate 36b to be used. The installation state of the female screw portion 36a on the frame bodies 36-1 and 36-2 is the same as that of the female screw portion 24b of the embodiment shown in FIG.

  FIG. 7 is a view illustrating a state in which the diameter expanding means 38 of the embodiment shown in FIG. 6 is used, the sleeve 16 is expanded in diameter, and the annular covering 12 is pressed against the existing pipe 20. In the present embodiment, the moving body 26 provided on the opposite side of the frame bodies 36-1 and 36-2 is configured to press the inner peripheral surface of the sleeve where the protruding contact portion 14 of the annular covering body 12 is located. ing. In addition, although this press is performed via the mediation plates 40-1 and 40-2 formed with the elastic member, you may press without using the mediation plates 40-1 and 40-2.

  As a result, the protruding contact portion 14 of the annular covering 12 is securely brought into close contact with the inner peripheral surface 20a of the existing pipe 20. Furthermore, in this Embodiment, the frame bodies 36-1 and 36-2 in the diameter expansion state of the sleeve 16 will be in the state which mutually supports. Therefore, the diameter expansion means 38 that presses the inner peripheral surface of the sleeve 16 at the inner peripheral side position of the sleeve 16 presses the inner periphery of the sleeve 16 in a stable state without causing a positional shift or the like. Can do.

  FIG. 8 is a perspective view for explaining still another embodiment of the diameter expanding means. Here, the same elements as those shown in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted. In the diameter expanding means 42 of the present embodiment, the three frame bodies 44-1, 44-2, 44-3 are connected using the connecting plate 36b so that their centers are aligned on a straight line and are connected substantially parallel to each other. ing. And about the frame body 44-1 and the frame body 44-3 which are located in both sides, the internal thread part 44a (corresponding to the internal thread part 36a of FIG. 6) is provided on the opposite side, and it moves to the internal thread part 44a. The body 26 is screwed. Further, the frame body 44-2 positioned at the center is provided with female screw portions 44a on both sides thereof, and the moving body 26 is screwed into the female screw portion 44a. Here, the installation state of the female screw portion 44a on the frame bodies 44-1, 44-2, 44-3 is the same as that of the female screw portion 24b of the embodiment shown in FIG.

  FIG. 9 is a diagram illustrating a state in which the diameter expanding means 42 of the embodiment shown in FIG. 8 is used, the sleeve 16 is expanded in diameter, and the annular covering 12 is pressed against the existing pipe 20. Thus, by using the diameter expanding means 42, the sleeve 16 is pressed by the moving body 26 at both ends and the center of the sleeve 16. Thereby, the sleeve 16 and the annular covering body 12 having a longer dimension can be used. Therefore, the watertightness test can be performed on the existing pipe 20 in a wider range. In the present embodiment, the mediating plates 46-1, 46-2, and 46-3 are interposed between the moving body 26 and the sleeve 16 for pressing.

  FIG. 10 is a diagram for explaining another embodiment of the existing pipe water tightness test apparatus according to the present invention. Here, the same reference numerals are given to the same elements as those shown in the embodiment of FIG. 9, and the description thereof is omitted. In the present embodiment, the annular covering 12 and the sleeve so that the sealed space 32 is large enough to cover the water stop means 45 provided on the inner peripheral surface 20a of the existing pipe 20 for repairing the existing pipe 20. The width of 16 and the height of the protruding contact portion 14 are set.

  Here, the water stop means 45 is mainly composed of a water stop ring covering body 47 having protrusions 47a at both ends and a water stop sleeve 49 capable of expanding the diameter within a predetermined range. Then, a water-stopping annular cover 47 is placed on the outer periphery of the water-stopping sleeve 49, the water-stopping sleeve 49 is expanded in diameter, and the water-stopping annular cover 47 is pressed against the inner peripheral surface 20 a of the existing pipe 20. It is. Thereby, the flooding location etc. of the existing pipe 20 are stopped and repaired. In the covering 42 for repair of this Embodiment, the watertightness of the water stop means 45 itself applied to the existing pipe 20 is tested by setting the sealed space 32 to a size that can cover the water stop means 45. It is possible to do.

  11A and 11B are diagrams illustrating a state where the annular covering 12 and the sleeve 16 of the existing pipe water tightness test apparatus 10 are installed on the existing pipe 20. FIG. 11A is a view of the existing pipe water tightness test apparatus 10 as seen from the front, and FIG. 11B is a view of the existing pipe water tightness test apparatus 10 as seen from the side. Here, for ease of explanation, the state where the diameter expanding means 18 is installed is omitted. The same elements as those shown in the embodiment of FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  Thus, in the state where the existing pipe water tightness test apparatus 10 is installed, the fluid injection hose 52 is connected to the fluid injection plug 30. Here, the fluid injection plug 30 is a water inlet for enclosing a fluid for inspection in a sealed space 32 formed between the annular cover 12 and the inner peripheral surface 20a of the existing pipe 20. The fluid is supplied to the sealed space 32 through a flow hole 30a formed in the fluid injection plug 30 (see FIG. 5).

  Moreover, the fluid injection plug 30 is provided in the annular covering body 12, and the fluid injection plug 30 and the annular covering body 12 are kept airtight so that no fluid leaks from between them. . As a means for maintaining the airtightness, for example, various means such as covering the flange portion of the fluid injection plug 30 with a rubber sheet or the like can be used. The sleeve 16 is provided with a projecting hole for projecting the fluid injection plug 30 into the sleeve 16.

  A detector 54 is connected to the hose 52. The detector 54 is a device that measures the supply state of the fluid for inspection to the sealed space 32 and generates a measurement signal. In the present embodiment, the detector 54 has a function of measuring both the flow rate and pressure of the test fluid.

  The fluid used for the water tightness test can be a gas such as air or a liquid such as water. Reference numeral 50 denotes an air vent plug. When a liquid is used as the fluid, the air in the sealed space 32 is discharged from the air vent plug 50. The air vent plug 50 has the same configuration as the fluid injection plug 30. In the present embodiment, a pressure gauge 51 is also attached to the air vent plug 50 so that the pressure inside the sealed space 32 can be visually observed. With the pressure gauge 51, for example, an operator in the vicinity of the existing pipe watertight device 10 can check the pressure.

  FIG. 12 is a diagram illustrating an existing pipe water tightness test system using the existing pipe water tightness test apparatus 10 and the detector 54 according to the embodiment shown in FIG. Here, for ease of explanation, the state where the diameter expanding means 18 is installed is omitted. This embodiment illustrates an example in which water is used as a fluid for inspection. As shown in the figure, in the present embodiment, the existing pipe water tightness test system 78 has a fluid supply device that supplies fluid to the existing pipe water tightness test apparatus 10. Further, it has a signal processing device 64 (including a recording unit for recording the processed signal on a predetermined sheet) that processes a predetermined signal from the detector 54. In addition, the processing apparatus power source 72 and the supply apparatus power source 70 are used as a power source required in order to operate the existing pipe water-tightness test system 78. Here, in the present embodiment, the fluid supply device is the fluid conveyance pump 62.

  One side of the fluid conveyance pump 62 is connected in communication with a tank 68 storing water 74 and a hose 56 (56-3). The other side of the fluid conveyance pump 62 is connected to the sealed space 32 via the hose 52 by the hose 56-2 and the hose 56-1 via the valve 75 for opening and closing. The above-described detector 54 is installed between the valve 75 and the sealed space 32. Thereby, the pressure in the sealed space 32 can be detected. The above configuration may change the form depending on the measurement conditions.

  The pressure and flow rate of the water 74 measured by the detector 54 are transmitted as an electrical signal to the signal processing device 64 via the cable 60 and output from the signal processing device 64 as a measurement value. Here, the pressure of the water 74 measured by the detector 54 is also the pressure of the water 74 enclosed in the sealed space 32. The processing device power source 72 and the supply device power source 70 use a power source. Further, if there is a place where the water 74 can be used, for example, a reservoir or the like, the water storage tank 68 is not particularly required.

  Next, a method (existing pipe water tightness test method) of performing a water tightness test of the existing pipe 20 using the existing pipe water tightness test apparatus 10 shown in FIG. 1 will be described. First, pretreatment such as washing is performed as necessary (preliminary washing step) such as removal of deposits attached to the inner peripheral surface 20a of the existing pipe 20 to be tested. A predetermined cleaning means such as a brush is used for cleaning. Next, the existing pipe water-tightness test apparatus 10 is carried into the existing pipe 20 in a state where the existing pipe water-tightness test apparatus 10 is separated into the annular covering body 12, the sleeve 16, and the diameter-expanding means 18. As described above, the existing pipe water tightness test apparatus 10 is carried into the existing pipe 20 in a state of being separated into the respective components. Accordingly, each component can easily pass through a manhole (usually 600 mm in diameter), an air valve opening, or the like, which is the carry-in route.

  Next, the existing pipe water tightness test apparatus 10 is installed in the existing pipe 20, and a sealed space 32 (see FIG. 5) is formed between the outer peripheral surface of the annular covering 12 and the inner peripheral surface 20 a of the existing pipe 20. (Device installation process). The procedure is as follows. First, the sleeve 16 is installed inside the annular cover 12 and combined in a cylindrical shape at an inspection location in the existing pipe 20, for example, at a joint portion between short pipes constituting the existing pipe 20. Next, the diameter-expanding means 18 is disposed inside the sleeve 16 whose diameter is increased in a substantially cylindrical shape. Then, the moving body 26 is moved to the inner peripheral surface of the sleeve 16, and the inner surface of the sleeve 16 is pressed by the tip portion 26c formed in a substantially hemispherical shape. By this pressing, the state in which the annular covering body 12 is strongly pressed against the inner peripheral surface 20a of the existing pipe 20 via the sleeve 16 (the expanded state) is maintained, and the above-described sealed space 32 is in a stable state. It is formed.

  Next, installation and connection of equipment and the like necessary for the water tightness test are performed. In the present embodiment, first, arrangement and connection of devices and the like necessary for the state shown in FIG. 12 are performed. Thereafter, the measurement fluid is supplied. As the procedure, first, the fluid transport pump 62 is used to supply water 74 as the inspection fluid to the sealed space 32. Here, the air in the sealed space 32 is exhausted from the air vent plug 50 provided in the sleeve 16 simultaneously with the sealing of the fluid. The air vent plug 50 is closed when the inspection fluid is filled in the sealed space 32. In this state, that is, in a state where the air vent plug 50 is closed and the hose 52 is connected to the fluid injection plug 30, the pressure of the filled water 74 is set to a predetermined value (for example, by supplying the water 74 by the fluid conveying pump 62 (for example, 0.5MPa) (fluid supply process). The pressure state at this time is performed while observing the scale of the pressure gauge 51, for example. Then, the operation of the fluid conveyance pump 62 is stopped. In this state, the valve 75 provided on the hose 56 is closed. After the valve 75 is closed, a change in the pressure (filling pressure) of the water 74 in the sealed space 32 is accurately detected by the detector 54 (fluid pressure measurement step). Here, the measurement value obtained by the detector 54 is output from the signal processing device 64. And the signal processor 64 is used, and the pressure change of the water 74 mentioned above is recorded in a recording part with time (recording process). This recorded data is output in various formats.

  And the determination process which determines the water-tightness of the existing pipe | tube 20 using the recorded output data is performed. By this step, for example, it is possible to determine a watertight state of a measurement location (such as a joint portion or a crack) of the existing pipe 20. That is, when the time transition of the pressure (filling pressure) of the water 74 in the sealed space 32 is observed, the inner peripheral surface 20a of the existing pipe 20 covered with the annular covering body 12 is not cracked and sealed. When the water 74 does not leak, the filling pressure of the water 74 does not drop from a certain value. On the other hand, when there is a crack or the like on the inner peripheral surface 20a of the existing pipe 20 and the water 74 leaks out of the existing pipe 20, the filling pressure of the water 74 is further reduced from the above-mentioned constant value. In some cases, the pressure continues to drop to near the external pressure of the existing pipe 20. Therefore, the water tightness of the existing pipe 20 can be inspected by changing the filling pressure of the sealed liquid in the sealed space 32. As described above, by using the existing pipe water tightness test apparatus 10 according to the present embodiment, it is possible to quickly inspect the water tightness of the existing pipe by an easy procedure.

  In addition, the pressure which encloses the water 74 in the sealed space 32 in the fluid supply process can be set to a desired pressure as appropriate, and can be 1.0 MPa or more, for example.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment shown in FIG. 1, the moving body 26 is formed as a bolt body. However, the moving body 26 is not limited to this. For example, the moving body 26 has a configuration in which the moving shaft moves hydraulically. Also good.

  In the embodiment shown in FIG. 5, an elastic plate made of rubber or the like may be interposed between the annular cover 12 and the sleeve 16, particularly between the protruding contact portion 14 and the sleeve 16. Thereby, the contact | adherence state to the existing pipe | tube 20 of the protrusion contact | adherence part 14 is stabilized.

  In addition, although the diameter expanding means 18 of the embodiment shown in FIGS. 1 and 4 is made of steel, it is made of a light alloy having the same strength as steel, for example, an aluminum alloy from the viewpoint of transportation and handling. May be. Since the specific gravity of the aluminum alloy is about 1/3 of that of the steel material, the aluminum alloy can be easily transported and carried into the existing pipe 20 by being formed of the aluminum alloy. Furthermore, the diameter expanding means 18 may be made of a synthetic resin. In addition, the main body 24 can be assembled so that handling such as transportation can be facilitated.

  In the embodiment shown in FIG. 8, the three frame bodies 44-1, 44-2, 44-3 are used for the diameter expanding means 42. However, four or more frame bodies are used. May be.

It is a disassembled perspective view explaining the structure of the existing pipe water-tightness test apparatus concerning this invention. It is a figure explaining the cyclic | annular covering body. It is a figure explaining the sleeve. It is a principal part enlarged view explaining the diameter expansion means. It is a figure explaining the state which used the sleeve and the diameter expansion means, and pressed the cyclic | annular covering body to the internal peripheral surface of the existing pipe. It is the perspective view explaining other embodiment of the diameter expansion means. It is the figure explaining the state which used the diameter expansion means of embodiment shown in FIG. 6, expanded the sleeve, and pressed the cyclic | annular covering body to the existing pipe | tube. It is the perspective view explaining further another embodiment of the diameter expansion means. It is the figure explaining the state which used the diameter-expansion means of embodiment shown in FIG. 8, expanded the sleeve, and pressed the cyclic | annular covering body to the existing pipe | tube. It is the figure explaining other embodiment of the existing pipe water-tightness test apparatus concerning this invention. It is the figure explaining the state which installed the cyclic | annular covering body of the water-tightness test apparatus, and the sleeve in the existing pipe | tube. (A) is the figure which looked at the water-tightness test apparatus from the front, (B) is the figure which looked at the water-tightness test apparatus from the side. It is the figure explaining the existing pipe water-tightness test system using the water-tightness test apparatus and detector of embodiment shown in FIG. It is the figure explaining the state which spliced short pipes in the edge part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Existing pipe water-tightness test apparatus 12 Annular covering body 14 Protrusion contact | adherence part 14a Protrusion 16 Sleeve 16-1, 16-2, 16-3 Constituent member 18 Diameter expansion means 20 Existing pipe 20a Inner peripheral surface 22 Hinge 24 Main part 24a Frame body 24b Female thread portion 26 Moving body 26a Male thread portion 26b Head portion 26c Tip portion 30 Fluid injection plug 32 Sealed space 36a Female thread portions 36-1, 36-2 Frame body 38 Diameter expansion means 42 Diameter expansion means 44-1 , 44-2, 44-3 Frame body 50 Air vent plugs 52, 56-1, 56-2, 56-3 Hose 54 Detector 60 Cable 62 Fluid supply device 64 Signal processing device 68 Water storage tank 70 Supply device power source 72 Treatment device power source 74 Water 78 Existing pipe water tightness test system

Claims (8)

A part of the inner peripheral surface of the existing pipe is covered with an annular covering provided with protruding contact portions on both edges of the outer peripheral surface, and the outer periphery of the annular covering is brought into close contact with the inner peripheral surface of the existing pipe. In an existing pipe water tightness test apparatus for inspecting the water tightness of the existing pipe by sealing a fluid in a pressurized state in a sealed space formed between a surface and the inner peripheral surface of the existing pipe,
A substantially cylindrical sleeve that is installed inside the annular cover so as to be capable of expanding the diameter, presses the inner peripheral surface of the annular cover in an expanded state, and makes the annular cover closely contact the inner peripheral surface of the existing pipe. When,
A main body provided on the inner side of the sleeve, and a movable body installed on the main body at predetermined intervals so as to be movable in the direction of the inner peripheral surface of the sleeve. A diameter expansion means for performing a diameter expansion operation of the sleeve by movement in a direction;
An existing pipe water-tightness testing device characterized by comprising: The main body portion of the diameter expanding means includes a frame body formed in a substantially circular shape,
An internal thread portion provided in the frame body at predetermined intervals and extending in a radial direction of the frame body,
2. The existing pipe water tightness test apparatus according to claim 1, wherein the movable body is formed as a bolt body and is screwed into the female screw portion to move in the inner circumferential direction of the sleeve.   The existing pipe water-tightness testing apparatus according to claim 1, wherein a tip end portion of the moving body in the moving direction is formed in a substantially hemispherical shape.   4. The existing pipe water tightness test apparatus according to claim 2, wherein a plurality of the frame bodies of the main body portion of the diameter expanding means are opposed to each other in parallel at a predetermined interval.   The protruding contact portion of the annular covering is formed in a shape in which a plurality of rows of protrusions continuous in the circumferential direction of the annular covering are inclined inward in the width direction of the annular covering. The existing pipe water-tightness test apparatus according to any one of claims 1 to 4.   The width of the annular cover and the sleeve and the height of the projecting contact portion so that the sealed space is large enough to cover the water stop means provided on the inner peripheral surface of the existing pipe for repairing the existing pipe. The existing pipe water tightness test apparatus according to any one of claims 1 to 5, wherein The existing pipe water tightness test apparatus according to any one of claims 1 to 6,
A fluid supply device for supplying a fluid for inspection into a sealed space formed between the annular covering of the existing pipe water tightness test apparatus and an inner peripheral surface of the existing pipe;
A detector for supplying a predetermined amount of the fluid to the sealed space, measuring a pressure change after the supply is stopped, and emitting a measurement signal;
A signal processing device that processes the measurement signal from the detector and outputs the processed data and records over time;
An existing pipe water tightness test system characterized by comprising: The apparatus carrying-in process of carrying in the existing pipe water tightness test apparatus according to any one of claims 1 to 6 into the existing pipe in a state where the constituent members of the existing pipe water tightness test apparatus are separated from each other;
The sleeve is installed inside the annular covering, the sleeve is expanded by the diameter expanding means, a part of the inner peripheral surface of the existing pipe is covered with the annular covering, and the outer peripheral surface of the annular covering An apparatus installation step for forming a sealed space with the inner peripheral surface of the existing pipe;
A fluid supply step of supplying a fluid for inspection until the fluid pressure reaches a predetermined fluid pressure;
A fluid pressure measuring step for measuring a pressure change of the fluid after the supply stop; and
A recording step of recording the measured pressure change over time;
A determination step of determining the water tightness of the existing pipe from the measurement record result of the pressure of the fluid;
An existing pipe water-tightness test method characterized by comprising:

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