JP2020176958A - Leakage test jig of existing pipe - Google Patents

Abstract

To inspect the presence of construction failures of a connection part of an existing pipe completely constructed from outside the pipe line.SOLUTION: A cylindrical packing 10 is provided with: first seal surfaces 23, 33 in contact with an outer peripheral surface of a first pipe element 80 and second seal surfaces 24, 34 in contact with an outer peripheral surface of a second pipe element 90; and a recess for forming air sump space around a connection part of an existing pipe. The cylindrical packing 10 is divided into a first packing element 20 and a second packing element 30. A housing 40 mounted to the outside of the cylindrical packing 10 is divided into a first housing element 50 and a second housing element 60. A fastening mechanism is provided which fastens the first housing element 50 and the second housing element 60. The housing 40 and the cylindrical packing 10 are provided with air passages 26, 53.SELECTED DRAWING: Figure 1

Description

The present invention can be used for a leak test jig for an existing pipe, particularly for an existing pipe for inspecting the possibility of water leakage due to a construction failure at a joint and a pipe connection in the existing pipe by changing the air pressure. Leakage test jig.

FIG. 11 is an explanatory view showing an example of a sewage pipe system extending from a water-related part of a high-rise building. In this sewage piping system, the trap 101 of the bathtub 100 such as a unit bath and the vertical pipe 200 are connected by a drawer pipe 110, a connecting pipe 120, and a merging pipe 210, and the water discharged from the trap 101 is a drawer pipe. It is discharged to the vertical pipe 200 via the 110, the connecting pipe 120, and the merging pipe 210. In such a sewage pipe system, the construction of the drawer pipe 110 within the range of the trap 101 indicated by reference numeral Z1 in the drawing and the bathroom wall (not shown) is performed by the bathroom contractor (unit bath contractor) at the time of bathroom installation. .. Further, the construction of the vertical pipe 200 and the merging pipe 210 in the range indicated by the reference numeral Z3 in the drawing is performed prior to the installation of the bathroom. Further, the construction of the connecting pipe 120 within the range indicated by the reference numeral Z2 in the drawing is performed after the construction of the merging pipe 210 and the construction of the drawer pipe 110 described above are performed.

On the other hand, in the sewage piping system shown in FIG. 11, the vertical pipe 200 and the merging pipe 210 in the range indicated by reference numeral Z3 are inspected for construction defects at the connection portion between the joint and the pipe. One of the test methods adopted for inspecting the presence or absence of construction defects is a full-empty test (see, for example, Patent Document 1). In this full-empty test, the presence or absence of construction defects in the piping system is inspected by changing the air pressure in the pipeline. Then, in the conventional full-empty test, a closed space is formed in the pipeline by airtightly sealing a predetermined portion of the pipeline with a stop balloon or the like inserted into the pipeline, and the air confined in the sealed space is formed. It was to inspect the pressure change after a certain period of time. Therefore, the conventional full-empty test has to be carried out sequentially each time during the piping construction. In addition, the vertical pipe 200, which uses a relatively large joint with a cleaning port capable of inserting a stop balloon into the pipe line, has been targeted. Therefore, the conventional full-empty test could not be applied to the existing pipes for which the construction was completed, and could not be applied to the pipes in which the joint with the cleaning port was not used.

Regarding this point, in the sewage piping system shown in FIG. 11, since the connecting pipe 120 in the range indicated by reference numeral Z2 is formed by a pipeline having a relatively small diameter, the joint interposed in the connecting pipe 120 is also small. However, it does not have a cleaning port. Further, since the shape of the trap 101 of the bathtub 100 such as the unit bath in the range indicated by the reference numeral Z1 is complicated, it is not possible to seal or insert the stop balloon. Moreover, the construction of the connecting pipe 120 is performed after the construction of the confluence pipe 210 and the construction of the drawer pipe 110 described above are completed. Therefore, the conventional full-empty test could not be applied to the connecting pipe 120.

Utility Model Registration No. 3215482 Gazette

As mentioned above, the conventional full-empty test cannot be applied to existing pipes for which construction has been completed, and also for pipes where a stop balloon cannot be inserted, such as when a joint with a cleaning port is not used. Could not be applied.

The present invention has been made in view of the above circumstances, and it is not necessary to airtightly seal a predetermined portion of the pipeline with a stop balloon or the like, and the existing pipe whose construction has been completed can be connected to the pipe from the outside of the pipeline. It is an object of the present invention to provide a new leakage test jig for existing pipes capable of inspecting the presence or absence of construction defects at the connection portion.

The leak test jig according to the present invention is attached to the existing pipe when inspecting the presence or absence of a defective portion of the existing pipe by changing the air pressure. Then, of the first tube element and the second tube element connected to the first tube element, the first sealing surface that contacts the outer peripheral surface of the first tube element and the second that contacts the outer peripheral surface of the second tube element. Sealing surfaces are provided separately at two locations in the axial direction, and air is provided between the first sealing surface and the second sealing surface and around the connection portion between the first pipe element and the second pipe element. With a cylindrical packing that is provided on the outside of the existing pipe at a position that covers the connection portion by being provided with a recess for forming a reservoir space and being divided at one or two locations in the circumferential direction. A housing that can be mounted on the outside of the cylindrical packing and that can be expanded / contracted and deformed in the radial direction of the cylindrical packing, and the housing can be deformed in the radial direction of the cylindrical packing. The first sealing surface and the second sealing surface of the mounted cylindrical packing are airtightly adhered to the outer peripheral surfaces of the first tube element and the second tube element, and the end surface of the divided portion of the cylindrical packing. It has a tightening mechanism for sealing the air reservoir space by making them airtightly adhere to each other, and the housing and the cylindrical packing are provided with an air passage leading to the recess. is there.

In the above, the first pipe element and the second pipe element include a joint and a pipe, and the connection portion between the first pipe element and the second pipe element is connected by inserting or screwing a pipe into the joint. A part, a connection part connected by inserting or screwing the other pipe into one pipe.

In a leak test jig having the above configuration, when performing a leak test, a cylindrical packing is attached to the outside of the existing pipe at a position covering the connection portion between the first pipe element and the second pipe element, and the cylindrical packing is formed. After mounting the housing on the outside of the packing, the cylindrical packing is radially reduced in diameter by a tightening mechanism, so that the first sealing surface and the second sealing surface of the cylindrical packing are formed into the first pipe element and the second. The first pipe element and the first pipe element are in a recess that is airtightly adhered to each outer peripheral surface of the pipe element, and the end faces of the divided portions of the cylindrical packing are airtightly adhered to each other and forms an air reservoir space of the cylindrical packing. The connection part with the two pipe elements faces. Then, after supplying air to the recess using the air passage provided in the housing and the cylindrical packing, positive pressure air is trapped in the recess and the pressure change after a certain period of time is inspected. By doing so, it is possible to inspect the presence or absence of construction defects at the connection portion. In the leak test jig having the above configuration, instead of the leak test method in which positive pressure air is confined in the recess and the pressure change is inspected after a certain period of time as described above, the housing and the cylindrical packing are used. It is possible to adopt a method of inspecting the pressure change after a certain period of time by confining negative pressure air in the recess after sucking from the recess using the provided air passage.

In the present invention, the cylindrical packing is divided at two points in the circumferential direction and is composed of two first and second packing elements having a semicircular front view, and the housing is the first and second packing elements. It is desirable that it is composed of two housing elements, a first and a second, which separately cover the two packing elements. When this configuration is adopted, the cylindrical packing can be easily mounted on the outside of the existing pipe, and the housing can be easily mounted on the outside of the cylindrical packing.

In the present invention, the circumferential length of the first packing element is longer than the circumferential length of the semicircular inner peripheral surface of the first housing element, and the circumferential length of the second packing element is It is desirable to adopt a configuration in which the length of the inner peripheral surface of the second housing element, which is semicircular in front view, is longer than the circumferential length. When this configuration is adopted, the cylindrical packing is deformed in the radial direction by the tightening mechanism, so that the end faces of the divided portions of the cylindrical packing can be reliably and airtightly adhered to each other.

In the present invention, the first packing element is joined to the inner peripheral surface of the first housing element, and one end and the other end of the first packing element in the circumferential direction are the circumference of the first housing element. Protruding from one end and the other end in the direction, the second packing element is joined to the inner peripheral surface of the second housing element, and one end and the other end in the circumferential direction of the second packing element are formed. It is desirable to adopt a configuration in which the second housing element protrudes from one end and the other end in the circumferential direction. When this configuration is adopted, the first packing element and the first housing element, and the second packing element and the second housing element can be handled as one component, respectively, so that the first pipe element and the second pipe element can be used. It is easy to attach them to the connection part quickly and easily.

In the present invention, a positioning mark is provided on the circumferential end surface of the first housing element or the second housing element, and by aligning the positioning mark with the end surface of the first tube element, the recess is formed with the first tube element. It is desirable to adopt a configuration in which the connection portion with the second pipe element faces. If this configuration is adopted, it is possible to accurately face the recess of the cylindrical packing at the connection portion between the first pipe element and the second pipe element.

In the present invention, the tightening mechanism includes a bifurcated first flange and a second flange separately provided at one end and the other end in the circumferential direction of the first and second housing elements, and the second flange. A screw shaft that is attached to the foldable position and is inserted into the crotch portion of the bifurcated first flange facing the second flange by standing up from the laid-down posture to the standing posture, and the screw shaft in the standing state. It is desirable to adopt a configuration in which the nut is screwed into and tightens the first flange facing the second flange. When this configuration is adopted, it becomes easy to quickly and accurately perform the operation for reducing the diameter of the housing by the tightening mechanism.

In the present invention, it is possible to adopt a configuration in which the first pipe element is a resin joint and the second pipe element is a resin pipe inserted into the resin joint and joined by an adhesive. is there. The resin joint includes a joint made of polyvinyl chloride or polyethylene, and the resin pipe includes a polyvinyl chloride pipe or a polyethylene pipe. This configuration corresponds to the configuration of the connecting pipe 120 described with reference to FIG.

As described above, the leak test jig according to the present invention can be applied to an existing pipe to which a conventional leak test jig cannot be applied. It can also be applied to pipes that do not use a relatively large joint with a cleaning port. Therefore, it becomes possible to easily carry out a leak test for each connection portion of the existing pipe for which construction has been completed. For example, as in the sewage pipe system shown in FIG. 11, it is possible to inspect the connection pipes constructed after the construction of the confluence pipes and the drawer pipes for the presence or absence of construction defects. Become.

It is a front view of the leakage test jig which concerns on embodiment of this invention. It is a front view of the 1st housing element. It is a view of arrow a of FIG. 2A. It is a front view of the 2nd housing element. It is a b arrow view of FIG. 3A. It is a front view of the 1st packing element combined with the 1st housing element. It is a view of arrow a of the 1st packing element of FIG. 4A. It is a front view of the 2nd packing element combined with the 2nd housing element. It is a b arrow view of the 2nd packing element of FIG. 5A. It is a front view of a screw shaft. It is a top view which showed the mounting structure of the screw shaft of FIG. It is a top view of the state which the 2nd housing element is attached to the existing pipe. It is sectional drawing corresponding to the part along the IX-IX line of FIG. It is an enlarged view of the IXB part of FIG. 9A. It is explanatory drawing which showed the deformation example of a recess. It is explanatory drawing which showed an example of the sewage piping system.

FIG. 1 is a front view of the leakage test jig T according to the embodiment of the present invention. The leak test jig T includes a cylindrical packing 10 made of an elastic material such as rubber, a metal housing 40, and a tightening mechanism 70. As can be inferred from FIG. 1, the cylindrical packing 10 is divided into two places (two places at 180 degree intervals) at equal intervals in the circumferential direction and formed in a substantially symmetrical shape. It is composed of an element 20 and a second packing element 30. Similarly, the housing 40 is also composed of an arcuate first housing element 50 and a second housing element 60 formed in a substantially symmetrical shape. Here, in a state where the housing 40 composed of the two members of the first housing element 50 and the second housing element 60 is mounted on the outside of the cylindrical packing 10, the diameter of the cylindrical packing 10 naturally increases in the radial direction. It can be transformed.

2A is a front view of the first housing element 50, FIG. 2B is a view taken along the arrow a of FIG. 2A, FIG. 3A is a front view of the second housing element 60, and FIG. 3B is a view taken along the arrow b of FIG. 3A. The first housing element 50 shown in FIGS. 2A and 2B is provided with a bifurcated first flange 51 projecting outward at one end and the other end in the circumferential direction. Reference numeral 52 indicates the crotch portion of the bifurcated first flange 51. Further, an air passage 53 is provided at the center of the first housing element 50 in the circumferential direction and the axial direction. On the other hand, the second housing element 60 shown in FIGS. 3A and 3B is provided with a bifurcated second flange 61 projecting outward at one end and the other end in the circumferential direction, respectively. The second flange 61 is provided with two screw holes 63 arranged in the axial direction of the second housing element 60. Reference numeral 62 indicates the crotch portion of the bifurcated second flange 61.

4A is a front view of the first packing element 20 combined with the first housing element 50, FIG. 4B is an arrow view of the first packing element 20 of FIG. 4A, and FIG. 5A is a combination with the second housing element 60. A front view of the second packing element 30 and FIG. 5B is a view taken along the line b of the second packing element 30 of FIG. 5A. The first packing element 20 and the second packing element 30 are formed in a substantially symmetrical shape. Then, by aligning the end faces 21 and 22 of one end and the other end of the first packing element 20 in the circumferential direction and the end faces 31 and 32 of the one end and the other end of the second packing element 30 in the circumferential direction, FIG. The cylindrical packing 10 shown in the above is formed. Therefore, the first packing element 20 and the second packing element 30 are provided with a portion provided in the cylindrical packing 10. That is, as shown in FIGS. 4B and 5B, the first packing element 20 and the second packing element 30 have the first sealing surfaces 23, 33 and the second sealing surfaces 24, 34 on their inner surfaces. It is provided separately at two locations in each direction, and recesses 25 and 35 are provided between the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34. The actions of the first sealing surfaces 23, 33, the second sealing surfaces 24, 34, and the recesses 25, 35 will be described later. Further, as shown in FIG. 4B, an air passage 26 leading to the recess 25 is provided at the center of the first packing element 20 in the circumferential direction and the axial direction.

FIG. 6 is a front view of the screw shaft 71, which is one of the components of the tightening mechanism 70, and FIG. 7 is a plan view showing the mounting structure of the screw shaft 71 of FIG. As shown in FIG. 6, the screw shaft 71 has a ring portion 72 at one end thereof. Further, as shown in FIG. 7, at the mounting location of the screw shaft 71, one end and the other end of the mounting shaft 73 in which the ring portion 72 of the screw shaft 71 is foldably fitted are formed by the mounting bolt 74. The ring portion 72 is screwed to the bifurcated second flange 61 of the second housing element 60, and the ring portion 72 is arranged on the crotch portion 62 of the bifurcated second flange 61. More specifically, the two mounting bolts 74, which are separately inserted into the bolt insertion holes provided at one end and the other end of the mounting shaft 73, are the two screw holes 63 and 63 of the bifurcated second flange 61. It is screwed into each separately. Further, a ring portion 72 of the screw shaft 71 is fitted in the central portion of the mounting shaft 73, and this ring portion 72 is arranged in the crotch portion 62 of the bifurcated second flange 61. As shown in FIG. 7, a nut 75 is screwed into the screw shaft 71.

In this embodiment, the tightening mechanism 70 includes a bifurcated first flange 51 of the first housing element 50, a screw shaft 71 foldably attached to the bifurcated second flange 61 of the second housing element 60, and a nut 75. have. Then, when the screw shaft 71 is raised from the inverted posture to the upright posture, the screw shaft 71 is inserted into the crotch portion 52 of the bifurcated first flange 51 of the first flange element 50 facing the bifurcated second flange 61. It has become so. Therefore, when the nut 75 is tightened after the screw shaft 71 is inserted into the crotch portion 52 of the bifurcated first flange 51, the bifurcated first flange 51 facing the bifurcated second flange 61 is tightened as shown in FIG.

As is apparent from FIG. 4A or FIG. 5A, in this embodiment, the circumferential length of the first packing element 20 is longer than the circumferential length of the front-view semicircular inner peripheral surface of the first housing element 50. The circumferential length of the second packing element 30 is longer than the circumferential length of the semicircular inner peripheral surface of the second housing element 60. Further, the first packing element 20 is bonded to the inner peripheral surface of the first housing element 50 with an adhesive, and one end and the other end in the circumferential direction thereof are one end and one end in the circumferential direction of the first housing element 50. It protrudes from the other end. Further, the air passage 26 of the first packing element 20 and the air passage 53 of the first housing element 50 communicate with each other. Similarly, the second packing element 30 is bonded to the inner peripheral surface of the second housing element 60 with an adhesive, and one end and the other end in the circumferential direction thereof are one end in the circumferential direction of the second housing element 60. And protruding from the other end.

Next, the procedure for mounting the leak test jig T on the existing pipe and the procedure for the leak test will be described.
FIG. 8 is a plan view showing a state in which the second housing element 60 to which the second packing element 30 is adhered is attached to the existing pipe. The existing pipe in the example shows a connection portion in which a second pipe element 90 made of a resin pipe made of polyvinyl chloride is inserted into a large diameter first pipe element 80 made of a resin joint made of polyvinyl chloride and joined with an adhesive. Has C. For such an existing pipe, as shown in FIG. 8, the second housing element 60 is fitted under the existing pipe with the recess 35 of the second packing element 30 aligned with the connection portion C. .. After that, the first housing element 50 to which the first packing element 20 is adhered is aligned with the second housing element 60 and fitted to the upper side of the existing pipe. Next, as described above, the screw shaft 71 of the tightening mechanism 70 is raised from the prone position to the upright position, inserted into the crotch portion 52 of the bifurcated first flange 51, and then the nut 75 is tightened. The bifurcated first flange 51 facing the second flange 61 is tightened, and the housing 40 is reduced in diameter and deformed as the first housing element 50 and the second housing element 60 approach each other.

9A is a cross-sectional view corresponding to the portion along the IX-IX line of FIG. 1, and FIG. 9B is an enlarged view of the IXB portion of FIG. 9A. When the above mounting procedure described with reference to FIG. 8 is performed, as shown in FIG. 9A, the recess 25 of the first packing element 20 and the recess 35 of the second packing element 30 forming the cylindrical packing 10 are formed. The connection part C of the existing pipe faces. Further, the first sealing surfaces 23 and 33 of the first packing element 20 and the second packing element 30 forming the cylindrical packing 10 are in close contact with the outer peripheral surface of the first pipe element 80, and the second seal thereof. The surfaces 24 and 34 are in close contact with the outer peripheral surface of the second pipe element 90. Further, the end faces 21 and 22 on one end side and the other end side of the first packing element 20 corresponding to the divided portion of the cylindrical packing 10 and the end faces 31 and 32 on the one end side and the other end side of the second packing element 30. Are in close contact with each other (see FIG. 1).

In the mounting state described above, the recess 25 of the first packing element 20 and the recess 35 of the second packing element 30 form an air reservoir space of the cylindrical packing 10. Therefore, when the leakage test is carried out, the recesses 25 and 35 as the air storage space are shown by utilizing the air passages 26 and 53 provided in the first packing element 20 and the first housing element 50 and communicating with each other. After supplying air as shown by the lower arrow of 9A, positive pressure air is confined in the recesses 25 and 35, and the pressure change after a certain period of time is inspected. This makes it possible to inspect the connection portion C for construction defects. Here, in the leak test according to the embodiment of the present invention, a leak test was carried out in which positive pressure air was confined in the recesses 25 and 35 to inspect the pressure change after a certain period of time, but instead of this leak test method. Then, after sucking into the recesses 25 and 35 as shown by the upper arrow in FIG. 9A, negative pressure air may be trapped in the recesses 25 and 35 to inspect the pressure change after a certain period of time. .. In FIG. 1, a coupling joint 300 for connecting a pipe such as a hose for air supply or suction during a leak test is provided in the air passage 53 (see FIG. 9A) of the first housing element 50 described above. It shows the one.

In FIG. 9A, a leak test jig T is mounted at a position covering a connection portion C between one end of the first pipe element 80 made of a resin joint and the second pipe element 90 made of a resin pipe to perform a leak test. However, for the leak test of the connection portion C1 between the other end of the first pipe element 80 and the other pipe element 95 made of a resin pipe, the leak test jig T is attached at a position covering the connection portion C1. It can be carried out by doing.

Further, when the leak test jig T is attached to the existing pipe, it is necessary to align the recess 35 of the second packing element 30 with the connecting portion C of the existing pipe as shown in FIG. Therefore, in this embodiment, in order to enable such alignment work to be easily and reliably performed, both end faces in the circumferential direction of the second housing 60 to which the second packing element 30 is combined are provided. Positioning marks 64 are provided to match the end faces of the first pipe element 80 (see FIGS. 8, 3A, and 3B). In this way, the operator can visually align the positioning mark 64 with the end face of the first pipe element 80, so that the recess 35 of the second packing element 30 is aligned with the connection portion C of the existing pipe. Can be easily and reliably performed. When the leak test jig T is attached to the existing pipe, the recess 35 of the second packing element 30 is not always aligned with the connection portion C of the existing pipe as shown in FIG. 8, and the first packing element is not always aligned. The recess 25 of 20 may be aligned with the connection portion C of the existing pipe. Therefore, in consideration of aligning the recess 25 of the first packing element 20 with the connecting portion C of the existing pipe, in this embodiment, the circumferential direction of the first housing 50 to which the first packing element 20 is combined. Positioning marks 54 that match the end faces of the first pipe element 80 are also provided on both end faces of the above (see FIGS. 2A and 2B).

FIG. 10 is an explanatory view showing a modified example of the recess 25 shown in FIG. 9B. The recess 25 shown in FIG. 9B is formed by a grooved surface and a tapered surface formed on the inner peripheral surface of the first packing element 20, whereas the recess 25 shown in FIG. 10 is the first. It is formed by an inner peripheral surface having the same diameter as the sealing surface 23. The recess 35 of the second packing element 30 is formed in a shape symmetrical to the recess 25 of the first packing element 20.

The first pipe element and the second pipe element to which the leakage test jig according to the present invention is applied include a joint and a pipe, and the connection portion between the first pipe element and the second pipe element is a pipe to the joint. It also includes a connection that is connected by inserting or screwing in, and a connection that is connected by inserting or screwing the other pipe into one pipe. Further, the first tube element and the second tube element may be made of something other than resin, for example, metal. Further, the joint as the first pipe element or the second pipe element also includes various joints such as a socket type, an elbow type, a T type, and a cross type.

Further, in the leakage test jig T according to the present invention, the inner peripheral diameters of the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34 of the first packing element 20 and the second packing element 30 are the first pipe elements. It is appropriately determined according to the outer peripheral diameter of the 80 and the second pipe element 90. Therefore, when the outer peripheral diameters of the first pipe element 80 and the second pipe element 90 are different, the inner peripheral diameters of the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34 are also different accordingly. When the outer diameters of the first pipe element 80 and the second pipe element 90 are the same, the inner peripheral diameters of the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34 are also commensurate with the diameter. The same diameter is set.

In the above embodiment, the cylindrical packing 10 is divided into two parts, a first packing element 20 and a second packing element 30, at two points in the circumferential direction. At this point, the cylindrical packing 10 is divided into two places in the circumferential direction. It is also possible to adopt the one divided only by. The cylindrical packing 10 divided only at one location in the circumferential direction can be attached to the existing pipe by utilizing the opening created by the diameter expansion by opening the divided portion and expanding the diameter. Further, also for the housing 40, although the two first housing elements 50 and the second housing element 60 are separated and separated in the embodiment, the two first housing elements and the second housing element are separated in the circumferential direction thereof. It is possible to attach the ends on one side to the outside of the cylindrical packing by utilizing the opening created by hinge-connecting the ends so as to be openable and closable and opening around the hinge-joining portion. Even in such a housing, the cylindrical packing can be expanded and contracted in the radial direction.

T Leakage test jig C, C1 Connection part 10 Cylindrical packing 20 First packing element 30 Second packing element 21,22,31,32 End face of the divided part of the cylindrical packing 23,33 First sealing surface 25,35 Concave Place (air reservoir space)
26,53 Air passage 33,34 Second sealing surface 40 Housing 50 First housing element 51 Bifurcated first flange 52 Bifurcated first flange crotch 54 Positioning mark 60 Second housing element 61 Bifurcated second flange 62 Bifurcated second flange Crotch part 71 Thread shaft 75 Nut 70 Tightening mechanism 80 1st pipe element 90 2nd pipe element

The present invention is used for a leak test jig for existing pipes, especially for inspecting the possibility of water leakage due to poor construction at a stepped connection between a joint and a pipe in an existing pipe by changing the air pressure. Regarding leak test jigs for existing pipes that can be used.

FIG. 10 is an explanatory view showing an example of a sewage pipe system extending from a water-related part of a high-rise building. In this sewage piping system, the trap 101 of the bathtub 100 such as a unit bath and the vertical pipe 200 are connected by a drawer pipe 110, a connecting pipe 120, and a merging pipe 210, and the water discharged from the trap 101 is a drawer pipe. It is discharged to the vertical pipe 200 via the 110, the connecting pipe 120, and the merging pipe 210. In such a sewage pipe system, the construction of the drawer pipe 110 within the range of the trap 101 indicated by reference numeral Z1 in the drawing and the bathroom wall (not shown) is performed by the bathroom contractor (unit bath contractor) at the time of bathroom installation. .. Further, the construction of the vertical pipe 200 and the merging pipe 210 in the range indicated by the reference numeral Z3 in the drawing is performed prior to the installation of the bathroom. Further, the construction of the connecting pipe 120 within the range indicated by the reference numeral Z2 in the drawing is performed after the construction of the merging pipe 210 and the construction of the drawer pipe 110 described above are performed.

On the other hand, in the sewage piping system shown in FIG. 10 , the vertical pipe 200 and the merging pipe 210 in the range indicated by reference numeral Z3 are inspected for construction defects at the connection portion between the joint and the pipe. One of the test methods adopted for inspecting the presence or absence of construction defects is a full-empty test (see, for example, Patent Document 1). In this full-empty test, the presence or absence of construction defects in the piping system is inspected by changing the air pressure in the pipeline. Then, in the conventional full-empty test, a closed space is formed in the pipeline by airtightly sealing a predetermined portion of the pipeline with a stop balloon or the like inserted into the pipeline, and the air confined in the sealed space is formed. It was to inspect the pressure change after a certain period of time. Therefore, the conventional full-empty test has to be carried out sequentially each time during the piping construction. In addition, the vertical pipe 200, which uses a relatively large joint with a cleaning port capable of inserting a stop balloon into the pipe line, has been targeted. Therefore, the conventional full-empty test could not be applied to the existing pipes for which the construction was completed, and could not be applied to the pipes in which the joint with the cleaning port was not used.

In this regard, in the sewage piping system shown in FIG. 10 , since the connecting pipe 120 in the range indicated by reference numeral Z2 is formed by a pipeline having a relatively small diameter, the joint interposed in the connecting pipe 120 is also small. However, it does not have a cleaning port. Further, since the shape of the trap 101 of the bathtub 100 such as the unit bath in the range indicated by the reference numeral Z1 is complicated, it is not possible to seal or insert the stop balloon. Moreover, the construction of the connecting pipe 120 is performed after the construction of the confluence pipe 210 and the construction of the drawer pipe 110 described above are completed. Therefore, the conventional full-empty test could not be applied to the connecting pipe 120.

Utility Model Registration No. 3215482 Gazette

As mentioned above, the conventional full-empty test cannot be applied to existing pipes for which construction has been completed, and also for pipes where a stop balloon cannot be inserted, such as when a joint with a cleaning port is not used. Could not be applied.

The present invention has been made in view of the above circumstances, and it is not necessary to airtightly seal a predetermined portion of the pipeline with a stop balloon or the like, and the existing pipe whose construction has been completed can be connected to the pipe from the outside of the pipeline. It is an object of the present invention to provide a new leakage test jig for existing pipes capable of inspecting the presence or absence of construction defects at stepped connection portions.

The leak test jig according to the present invention has an outer diameter of a first pipe element having a large outer diameter made of a resin joint and a resin pipe inserted into the first pipe element and joined by an adhesive. When inspecting the presence or absence of construction defects at the stepped connection part with the second pipe element with a small diameter by changing the air pressure , it is attached to the first pipe element and the second pipe element across the connection part. To.

In this leak test jig, the first sealing surface having a large inner peripheral diameter in contact with the outer peripheral surface of the first pipe element and the second sealing surface having a small inner peripheral diameter contacting the outer peripheral surface of the second pipe element And are provided separately at two locations in the axial direction, and a stepped connection portion between the first sealing surface and the second sealing surface is provided between the first sealing surface and the second sealing surface. There are recesses around it to form an air reservoir space, and the packing elements are divided into two semi-circular first and second packing elements in the front view at two locations at equal intervals in the circumferential direction . A cylindrical packing that can be attached to the outside of the first tube element and the second tube element at a position that covers the connection portion, a first housing element to which the first packing element is joined to the inner peripheral surface, and the second packing. A housing that is composed of two housing elements with a second housing element in which the elements are joined to the inner peripheral surface and can be expanded and contracted in the radial direction of the cylindrical packing, and the housing is contracted in the radial direction of the cylindrical packing. By deforming the diameter, the first sealing surface and the second sealing surface of the cylindrical packing are airtightly adhered to the outer peripheral surfaces of the first tube element and the second tube element, and the cylindrical packing is divided. It has a tightening mechanism for sealing the air reservoir space by making the end faces of the portions airtightly adhere to each other.

Further, the recess has an inner peripheral diameter larger than the outer peripheral diameter of the first pipe element, has a width narrower than the widths of the first sealing surface and the second sealing surface, and has a stepped shape. It is formed in an annular square groove shape that is arranged so as to face the end face of the first pipe element around the connection portion of the above.

Further, a positioning mark is provided on the circumferential end surface of the first housing element or the second housing element, and both the positioning mark and the groove wall surface of the concave groove having a square groove shape are located at the same position in the axial direction. By aligning either of these positioning marks or the groove wall surface with the end face of the first pipe element in the axial direction, the connection portion between the first pipe element and the second pipe element faces the recess. and with that, to the housing and the cylindrical packing, the air passage communicating with the recess plant is provided, is that.

In the present invention, the resin joint includes a joint made of polyvinyl chloride or polyethylene, and the resin pipe includes a polyvinyl chloride pipe or a polyethylene pipe. This configuration corresponds to the configuration of the connecting pipe 120 described with reference to FIG.

In the leak test jig having the above configuration, when the leak test is performed, the first packing element joined to the inner peripheral surface of the first housing element and the first packing element joined to the inner peripheral surface of the second housing element. 2 The packing element is mounted on the outside of the existing pipe at a position covering the stepped connection portion, and the cylindrical packing is radially reduced and deformed by a tightening mechanism to form the first sealing surface and the first sealing surface of the cylindrical packing. 2 The sealing surface is airtightly adhered to the outer peripheral surfaces of the first pipe element and the second pipe element, and the end faces of the divided portions of the cylindrical packing are airtightly adhered to each other, and the air storage space of the cylindrical packing. A stepped connection portion between the first pipe element and the second pipe element is made to face the recess forming the. Then, after supplying air to the recess using the air passage provided in the housing and the cylindrical packing, positive pressure air is trapped in the recess and the pressure change after a certain period of time is inspected. By doing so, it is possible to inspect the presence or absence of construction defects at the connection portion. In the leak test jig having the above configuration, instead of the leak test method in which positive pressure air is confined in the recess and the pressure change is inspected after a certain period of time as described above, the housing and the cylindrical packing are used. It is possible to adopt a method of inspecting the pressure change after a certain period of time by confining negative pressure air in the recess after sucking from the recess using the provided air passage.

In the present invention, since each of the first and second packing elements having a semicircular front view is joined to the inner peripheral surface of each of the first and second packing elements, it is formed on the outside of the existing pipe. Cylindrical packing can be easily attached. Further, in the present invention, a positioning mark is provided on the circumferential end surface of the first housing element or the second housing element, and both the positioning mark and the groove wall surface of the square groove-shaped recess are located at the same position in the axial direction. By aligning either of these positioning marks or the groove wall surface with the end face of the first pipe element in the axial direction, the connection portion between the first pipe element and the second pipe element faces the recess. It has become. With this configuration, it is possible to accurately face the recess of the cylindrical packing in the stepped connection portion between the first pipe element and the second pipe element.

In the present invention, one end portion in the circumferential direction and the other end of the first packing element, protrude from the circumferential direction of the one end and the other end of the first housing element, the circumferential direction of the one end portion of the second packing element It is desirable to adopt a configuration in which the other end portion protrudes from one end portion and the other end portion in the circumferential direction of the second housing element. When this configuration is adopted, the first packing element and the first housing element, and the second packing element and the second housing element can be handled as one component, respectively, so that the first pipe element and the second pipe element can be used. It is easy to attach them to the connection part quickly and easily.

In the present invention, the tightening mechanism includes a bifurcated first flange and a second flange separately provided at one end and the other end in the circumferential direction of the first and second housing elements, and the second flange. A screw shaft that is attached to the foldable position and is inserted into the crotch portion of the bifurcated first flange facing the second flange by standing up from the laid-down posture to the standing posture, and the screw shaft in the standing state. It is desirable to adopt a configuration in which the nut is screwed into and tightens the first flange facing the second flange. When this configuration is adopted, it becomes easy to quickly and accurately perform the operation for reducing the diameter of the housing by the tightening mechanism.

As described above, the leak test jig according to the present invention can be applied to an existing pipe to which a conventional leak test jig cannot be applied. It can also be applied to pipes that do not use a relatively large joint with a cleaning port. Therefore, it becomes possible to easily carry out a leak test for each connection portion of the existing pipe for which construction has been completed. For example, as in the sewage pipe system shown in FIG. 10 , it is possible to inspect the connection pipes constructed after the construction of the confluence pipes and the drawer pipes for the presence or absence of construction defects. Become.

It is a front view of the leakage test jig which concerns on embodiment of this invention. It is a front view of the 1st housing element. It is a view of arrow a of FIG. 2A. It is a front view of the 2nd housing element. It is a b arrow view of FIG. 3A. It is a front view of the 1st packing element combined with the 1st housing element. FIG. 4A is a view taken along the line a of the first packing element of FIG. 4A. It is a front view of the 2nd packing element combined with the 2nd housing element. It is a b arrow view of the 2nd packing element of FIG. 5A. It is a front view of a screw shaft. It is a top view which showed the mounting structure of the screw shaft of FIG. It is a top view of the state which the 2nd housing element is attached to the existing pipe. It is sectional drawing corresponding to the part along the IX-IX line of FIG. It is an enlarged view of the IXB part of FIG. 9A. It is explanatory drawing which showed an example of the sewage piping system.

FIG. 1 is a front view of the leakage test jig T according to the embodiment of the present invention. The leak test jig T includes a cylindrical packing 10 made of an elastic material such as rubber, a metal housing 40, and a tightening mechanism 70. As can be inferred from FIG. 1, the cylindrical packing 10 is divided into two places (two places at 180 degree intervals) at equal intervals in the circumferential direction and formed in a substantially symmetrical shape. It is composed of an element 20 and a second packing element 30. Similarly, the housing 40 is also composed of an arcuate first housing element 50 and a second housing element 60 formed in a substantially symmetrical shape. Here, in a state where the housing 40 composed of the two members of the first housing element 50 and the second housing element 60 is mounted on the outside of the cylindrical packing 10, the diameter of the cylindrical packing 10 naturally increases in the radial direction. It can be transformed.

2A is a front view of the first housing element 50, FIG. 2B is a view taken along the arrow a of FIG. 2A, FIG. 3A is a front view of the second housing element 60, and FIG. 3B is a view taken along the arrow b of FIG. 3A. The first housing element 50 shown in FIGS. 2A and 2B is provided with a bifurcated first flange 51 projecting outward at one end and the other end in the circumferential direction. Reference numeral 52 indicates the crotch portion of the bifurcated first flange 51. Further, an air passage 53 is provided at the center of the first housing element 50 in the circumferential direction and the axial direction. On the other hand, the second housing element 60 shown in FIGS. 3A and 3B is provided with a bifurcated second flange 61 projecting outward at one end and the other end in the circumferential direction, respectively. The second flange 61 is provided with two screw holes 63 arranged in the axial direction of the second housing element 60. Reference numeral 62 indicates the crotch portion of the bifurcated second flange 61.

4A is a front view of the first packing element 20 combined with the first housing element 50, FIG. 4B is an arrow view of the first packing element 20 of FIG. 4A, and FIG. 5A is a combination with the second housing element 60. A front view of the second packing element 30 and FIG. 5B is a view taken along the line b of the second packing element 30 of FIG. 5A. The first packing element 20 and the second packing element 30 are formed in a substantially symmetrical shape. Then, by aligning the end faces 21 and 22 of one end and the other end of the first packing element 20 in the circumferential direction and the end faces 31 and 32 of the one end and the other end of the second packing element 30 in the circumferential direction, FIG. The cylindrical packing 10 shown in the above is formed. Therefore, the first packing element 20 and the second packing element 30 are provided with a portion provided in the cylindrical packing 10. That is, as shown in FIGS. 4B and 5B, the first packing element 20 and the second packing element 30, on their inner surface, the inner circumference and the first sealing surface 23 and 33 diameter inner periphery is larger The second sealing surfaces 24 and 34, which are small in diameter, are provided separately at two locations in the axial direction, and the recesses 25 and 35 are provided between the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34. Is provided. The actions of the first sealing surfaces 23, 33, the second sealing surfaces 24, 34, and the recesses 25, 35 will be described later. Further, as shown in FIG. 4B, an air passage 26 leading to the recess 25 is provided at the center of the first packing element 20 in the circumferential direction and the axial direction.

FIG. 6 is a front view of the screw shaft 71, which is one of the components of the tightening mechanism 70, and FIG. 7 is a plan view showing the mounting structure of the screw shaft 71 of FIG. As shown in FIG. 6, the screw shaft 71 has a ring portion 72 at one end thereof. Further, as shown in FIG. 7, at the mounting location of the screw shaft 71, one end and the other end of the mounting shaft 73 in which the ring portion 72 of the screw shaft 71 is foldably fitted are formed by the mounting bolt 74. The ring portion 72 is screwed to the bifurcated second flange 61 of the second housing element 60, and the ring portion 72 is arranged on the crotch portion 62 of the bifurcated second flange 61. More specifically, the two mounting bolts 74, which are separately inserted into the bolt insertion holes provided at one end and the other end of the mounting shaft 73, are the two screw holes 63 and 63 of the bifurcated second flange 61. It is screwed into each separately. Further, a ring portion 72 of the screw shaft 71 is fitted in the central portion of the mounting shaft 73, and this ring portion 72 is arranged in the crotch portion 62 of the bifurcated second flange 61. As shown in FIG. 7, a nut 75 is screwed into the screw shaft 71.

In this embodiment, the tightening mechanism 70 includes a bifurcated first flange 51 of the first housing element 50, a screw shaft 71 foldably attached to the bifurcated second flange 61 of the second housing element 60, and a nut 75. have. Then, when the screw shaft 71 is raised from the inverted posture to the upright posture, the screw shaft 71 is inserted into the crotch portion 52 of the bifurcated first flange 51 of the first flange element 50 facing the bifurcated second flange 61. It has become so. Therefore, when the nut 75 is tightened after the screw shaft 71 is inserted into the crotch portion 52 of the bifurcated first flange 51, the bifurcated first flange 51 facing the bifurcated second flange 61 is tightened as shown in FIG.

As is apparent from FIG. 4A or FIG. 5A, in this embodiment, the circumferential length of the first packing element 20 is longer than the circumferential length of the front-view semicircular inner peripheral surface of the first housing element 50. The circumferential length of the second packing element 30 is longer than the circumferential length of the semicircular inner peripheral surface of the second housing element 60. Further, the first packing element 20 is bonded to the inner peripheral surface of the first housing element 50 with an adhesive, and one end and the other end in the circumferential direction thereof are one end and one end in the circumferential direction of the first housing element 50. It protrudes from the other end. Further, the air passage 26 of the first packing element 20 and the air passage 53 of the first housing element 50 communicate with each other. Similarly, the second packing element 30 is bonded to the inner peripheral surface of the second housing element 60 with an adhesive, and one end and the other end in the circumferential direction thereof are one end in the circumferential direction of the second housing element 60. And protruding from the other end.

Next, the procedure for mounting the leak test jig T on the existing pipe and the procedure for the leak test will be described.
FIG. 8 is a plan view showing a state in which the second housing element 60 to which the second packing element 30 is adhered is attached to the existing pipe. The existing pipe in the example is a stepped pipe in which a second pipe element 90 made of a resin pipe made of polyvinyl chloride is inserted into a large diameter first pipe element 80 made of a resin joint made of polyvinyl chloride and joined with an adhesive. It has a shaped connecting portion C. For such an existing pipe, as shown in FIG. 8, the second housing element 60 is fitted under the existing pipe with the recess 35 of the second packing element 30 aligned with the connection portion C. .. After that, the first housing element 50 to which the first packing element 20 is joined is aligned with the second housing element 60 and fitted to the upper side of the existing pipe. Next, as described above, the screw shaft 71 of the tightening mechanism 70 is raised from the prone position to the upright position, inserted into the crotch portion 52 of the bifurcated first flange 51, and then the nut 75 is tightened. The bifurcated first flange 51 facing the second flange 61 is tightened, and the housing 40 is reduced in diameter and deformed as the first housing element 50 and the second housing element 60 approach each other.

9A is a cross-sectional view corresponding to the portion along the IX-IX line of FIG. 1, and FIG. 9B is an enlarged view of the IXB portion of FIG. 9A. When the above mounting procedure described with reference to FIG. 8 is performed, as shown in FIG. 9A, the recess 25 of the first packing element 20 and the recess 35 of the second packing element 30 forming the cylindrical packing 10 are formed. The stepped connection portion C of the existing pipe faces. Further, the first sealing surfaces 23 and 33 of the first packing element 20 and the second packing element 30 forming the cylindrical packing 10 are in close contact with the outer peripheral surface of the first pipe element 80, and the second seal thereof. The surfaces 24 and 34 are in close contact with the outer peripheral surface of the second pipe element 90. Further, the end faces 21 and 22 on one end side and the other end side of the first packing element 20 corresponding to the divided portion of the cylindrical packing 10 and the end faces 31 and 32 on the one end side and the other end side of the second packing element 30. Are in close contact with each other (see FIG. 1).

In the mounting state described above, the recess 25 of the first packing element 20 and the recess 35 of the second packing element 30 form an air reservoir space of the cylindrical packing 10. Therefore, when the leakage test is carried out, the recesses 25 and 35 as the air storage space are shown by utilizing the air passages 26 and 53 provided in the first packing element 20 and the first housing element 50 and communicating with each other. After supplying air as shown by the lower arrow of 9A, positive pressure air is confined in the recesses 25 and 35, and the pressure change after a certain period of time is inspected. This makes it possible to inspect the connection portion C for construction defects. Here, in the leak test according to the embodiment of the present invention, a leak test was carried out in which positive pressure air was confined in the recesses 25 and 35 to inspect the pressure change after a certain period of time, but instead of this leak test method. Then, after sucking into the recesses 25 and 35 as shown by the upper arrow in FIG. 9A, negative pressure air may be trapped in the recesses 25 and 35 to inspect the pressure change after a certain period of time. .. In FIG. 1, a coupling joint 300 for connecting a pipe such as a hose for air supply or suction during a leak test is provided in the air passage 53 (see FIG. 9A) of the first housing element 50 described above. It shows the one.

In FIG. 9A, a leak test jig T is attached at a position covering a stepped connection portion C between one end of the first pipe element 80 made of a resin joint and the second pipe element 90 made of a resin pipe to perform a leak test. However, in the leak test of the stepped connection portion C1 between the other end of the first pipe element 80 and the other pipe element 95 made of a resin pipe, the position covering the connection portion C1 is shown. It can be carried out by attaching the leakage test jig T to the.

Further, when the leak test jig T is attached to the existing pipe, it is necessary to align the recess 35 of the second packing element 30 with the connecting portion C of the existing pipe as shown in FIG. Therefore, in this embodiment, in order to enable such alignment work to be easily and reliably performed, both end faces in the circumferential direction of the second housing 60 to which the second packing element 30 is combined are provided. Positioning marks 64 are provided to match the end faces of the first pipe element 80 (see FIGS. 8, 3A, and 3B). In this way, the operator can visually align the positioning mark 64 with the end face of the first pipe element 80, so that the recess 35 of the second packing element 30 is aligned with the connection portion C of the existing pipe. Can be easily and reliably performed. When the leak test jig T is attached to the existing pipe, the recess 35 of the second packing element 30 is not always aligned with the connection portion C of the existing pipe as shown in FIG. 8, and the first packing element is not always aligned. The recess 25 of 20 may be aligned with the connection portion C of the existing pipe. Therefore, in consideration of aligning the recess 25 of the first packing element 20 with the connecting portion C of the existing pipe, in this embodiment, the circumferential direction of the first housing 50 to which the first packing element 20 is combined. Positioning marks 54 that match the end faces of the first pipe element 80 are also provided on both end faces of the above (see FIGS. 2A and 2B).

In the above, the case where the recesses 25 and 35 of the first or second packing elements 20 and 30 are aligned with the connection portion C of the existing pipe by using the positioning marks 54 and 64 has been described. In this regard, in this embodiment, as is clearly shown in FIGS. 9A or 9B, the recesses 25 and 35 have an inner peripheral diameter larger than the outer peripheral diameter of the first pipe element 80 and. , The width is narrower than the widths of the first sealing surfaces 23, 33 and the second sealing surfaces 24, 34, and is arranged around the stepped connection portion C so as to face the end surface of the first pipe element 80. It adopts a structure that is formed in an annular square groove shape. Further, both the positioning marks 54 and 64 and the groove wall surfaces of the square groove-shaped recesses 25 and 35 are located at the same positions in the axial direction, and either of these positioning marks 54 and 64 or the groove wall surface is designated. By aligning with the end face of the 1-tube element 80 in the axial direction, the connecting portion C between the 1-tube element 80 and the 2nd tube element 90 faces the recesses 25 and 35. Then, the above-mentioned air passage 26 is connected to the above-mentioned recess 25.

The first pipe element made of a resin joint to which the leakage test jig according to the present invention is applied includes various joints such as a socket type, an elbow type, a T type, and a cross type.

Further, in the leakage test jig T according to the present invention, the inner peripheral diameters of the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34 of the first packing element 20 and the second packing element 30 are the first pipe elements. It is appropriately determined according to the outer peripheral diameter of the 80 and the second pipe element 90. Therefore, when the outer peripheral diameters of the first pipe element 80 and the second pipe element 90 are different, the inner peripheral diameters of the first sealing surfaces 23 and 33 and the second sealing surfaces 24 and 34 are also different accordingly. Determined by the diameter .

T Leakage test jig C, C1 Connection part 10 Cylindrical packing 20 First packing element 30 Second packing element 21,22,31,32 End face of the divided part of the cylindrical packing 23,33 First sealing surface 25,35 Concave Place (air reservoir space)
26,53 Air passage
24 , 34 2nd sealing surface 40 Housing 50 1st housing element 51 Bifurcated 1st flange 52 Bifurcated 1st flange crotch 54 Positioning mark 60 2nd housing element 61 Bifurcated 2nd flange 62 Bifurcated 2nd flange crotch 71 Screw Shaft 75 Nut 70 Tightening mechanism 80 1st pipe element 90 2nd pipe element

Claims (7)

It is a leakage test jig for the existing piping that is attached to the existing piping when inspecting the presence or absence of construction defects in the existing piping by changing the air pressure.
Of the first pipe element and the second pipe element connected to the first pipe element, the first sealing surface in contact with the outer peripheral surface of the first pipe element and the second sealing surface in contact with the outer peripheral surface of the second pipe element. Are provided separately at two locations in the axial direction, and an air storage space is provided between the first sealing surface and the second sealing surface and around the connection portion between the first pipe element and the second pipe element. A cylindrical packing that can be mounted on the outside of the existing pipe at a position that covers the connection portion by being provided with a recess for forming the above-mentioned portion and being divided at one or two locations in the circumferential direction.
A housing that can be mounted on the outside of the cylindrical packing and that can be expanded and contracted in the radial direction of the cylindrical packing.
By deforming the housing in the radial direction of the cylindrical packing, the first sealing surface and the second sealing surface of the cylindrical packing to which the housing is mounted are formed into the first pipe element and the second pipe. It has a tightening mechanism for hermetically adhering to each outer peripheral surface of the element and hermetically adhering the end faces of the divided portions of the cylindrical packing to seal the air reservoir space.
A leakage test jig for existing piping, characterized in that the housing and the cylindrical packing are provided with an air passage leading to the recess. The cylindrical packing is divided at two points in the circumferential direction and is composed of two first and second packing elements having a semicircular front view, and the housing is the first and second two packing elements. The leakage test jig for an existing pipe according to claim 1, which is composed of two housing elements, a first and a second housing element, which separately cover the existing pipe. The circumferential length of the first packing element is longer than the circumferential length of the semicircular inner peripheral surface of the first housing element, and the circumferential length of the second packing element is the second. The leakage test jig for an existing pipe according to claim 2, which is longer than the circumferential length of the semicircular inner peripheral surface of the housing element. The first packing element is joined to the inner peripheral surface of the first housing element, and one end and the other end of the first packing element in the circumferential direction are one end in the circumferential direction of the first housing element. And the other end, the second packing element is joined to the inner peripheral surface of the second housing element, and one end and the other end of the second packing element in the circumferential direction are the second housing. The leak test jig for an existing pipe according to claim 3, which protrudes from one end and the other end in the circumferential direction of the element. A positioning mark is made on the circumferential end surface of the first housing element or the second housing element, and by aligning the positioning mark with the end surface of the first pipe element, the first pipe element and the second pipe are placed in the recess. The leak test jig for an existing pipe according to any one of claims 2 to 4, wherein the connection portion with the element faces. The tightening mechanism can be tilted onto the bifurcated first flange and the second flange separately provided at one end and the other end in the circumferential direction of the first and second housing elements, and the second flange. It is screwed into the screw shaft inserted into the crotch portion of the bifurcated first flange facing the second flange and the screw shaft in the standing state by standing up from the prone position to the standing position. The leak test jig for an existing pipe according to any one of claims 2 to 5, further comprising a nut for tightening the first flange facing the second flange. The invention according to any one of claims 1 to 6, wherein the first pipe element is a resin joint, and the second pipe element is a resin pipe inserted into the resin joint and joined by an adhesive. Leakage test jig for existing pipes.

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