Water stop structure for watertightness test device

Abstract

To ensure watertightness even when using high-pressure test fluid.SOLUTION: A water stop structure for a watertightness test device includes: an annular covering body 10; a first extension member 20 and a second extension member 30; and a fluid supply unit 40 for supplying test fluid. The fluid supply unit 40 comprises: a tubular member 41 which is inserted through a through-hole 18 formed in the annular covering body 10; an outer peripheral pressing member 43 which is made of a metal material that presses the periphery of the through-hole 18 on the outer peripheral surface of the annular covering body 10; an inner peripheral pressing member 45 which is made of a metal material that presses the periphery of the through-hole 18 on the inner peripheral surface of the annular covering body 10; and a fastening member 46 which tightens the outer peripheral pressing member 43 and the inner peripheral pressing member 45 in a direction of coming close to each other.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a water stop structure of a water tightness test device used when performing a water tightness test on a connection part of a pipe.

Background Art

[0002] For example, when connecting a plurality of pipes on-site to form a waterway or the like, it is necessary to confirm on-site whether the water tightness of the connection part of the pipe satisfies predetermined requirements. When performing this confirmation, a water tightness test device as disclosed in Patent Document 1 is used, for example. The water tightness test device of Patent Document 1 includes a rubber annular covering body that covers the connection part of the pipe from the inside, and a sleeve that can be expanded in diameter. During the test, the sleeve is expanded in diameter to bring the annular covering body into close contact with the inner peripheral surface of the pipe, and a test fluid is injected at a predetermined pressure from a rubber fluid injection plug provided on the annular covering body between the annular covering body and the inner peripheral surface of the pipe. Then, it is possible to determine whether the water tightness satisfies the predetermined requirements based on the pressure change of the test fluid thereafter.

[0003] Further, in Patent Document 1, a flange portion is provided at the base of the fluid injection plug for injecting the test fluid. By covering this flange portion with a rubber sheet, the sealing performance between the fluid injection plug and the annular covering body is ensured.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in order to ensure the accuracy of the waterproof test, there is a requirement to increase the pressure of the test fluid. In the case of Patent Document 1, since the structure is such that only the flange portion of the fluid injection plug is covered with a rubber sheet, it is considered that the pressure resistance of the joint portion between the fluid injection plug and the annular covering is likely to be a problem. That is, since the annular covering is made of rubber, the fluid injection plug is also made of rubber, and moreover, the sheet covering its flange portion is also made of rubber, when the pressure of the test fluid increases, all of the annular covering, the flange portion of the fluid injection plug, and the rubber sheet will stretch, and there is a risk that they will not be able to withstand high pressure.

[0006] The present disclosure is made in view of such a point, and the object thereof is to ensure water stoppage even when using a high-pressure test fluid.

Means for Solving the Problem

[0007] In order to achieve the above object, in one aspect of the present disclosure, it is possible to assume a water stoppage structure of a waterproof test device for testing the water tightness of the connection portion between the first pipe and the second pipe. The water stoppage structure of the waterproof test device is formed so as to extend from the inner peripheral surface of the first pipe to the inner peripheral surface of the second pipe, and includes a rubber annular covering along both inner peripheral surfaces, a first expansion member that presses the first pipe side on the inner peripheral surface of the annular covering against the inner peripheral surface of the first pipe, a second expansion member that presses the second pipe side on the inner peripheral surface of the annular covering against the inner peripheral surface of the second pipe, and a fluid supply portion provided in the annular covering for supplying a test fluid to the space formed between the outer peripheral surface of the annular covering and the first pipe and the second pipe.

[0008] The fluid supply unit includes a cylindrical member inserted into a through-hole formed in the annular covering, an outer peripheral pressing member made of a metal material that presses around the through-hole on the outer peripheral surface of the annular covering and has an outer peripheral side insertion hole through which the cylindrical member is inserted, an inner peripheral pressing member made of a metal material that presses around the through-hole on the inner peripheral surface of the annular covering and has an inner peripheral side insertion hole through which the cylindrical member is inserted, and a fastening member that fastens the outer peripheral pressing member and the inner peripheral pressing member in a direction approaching each other.

[0009] According to this configuration, the annular covering is pressed against the inner peripheral surface of the first pipe by the first expansion member and against the inner peripheral surface of the second pipe by the second expansion member, thereby completing the installation of the annular covering. In this state, the test fluid is supplied through the cylindrical member of the fluid supply unit into the space formed between the outer peripheral surface of the annular covering and the first pipe and the second pipe, and by measuring the pressure change of the test fluid, the result of the waterproofness test can be obtained. In this configuration, since the outer peripheral pressing member and the inner peripheral pressing member of the fluid supply unit are fastened by the fastening member, the outer peripheral pressing member presses around the through-hole on the outer peripheral surface of the annular covering, and the inner peripheral pressing member presses around the through-hole on the inner peripheral surface of the annular covering. As a result, the periphery of the through-hole of the annular covering is pressed and deformed in the thickness direction, so that the inner peripheral surface of the through-hole is strongly adhered to the outer peripheral surface of the cylindrical member, exhibiting high water-stopping performance.

[0010] Also, a sealing material made of vulcanized rubber or thermoplastic rubber may be provided between the outer peripheral pressing member and the periphery of the through-hole on the outer peripheral surface of the annular covering. Also, a sealing material made of vulcanized rubber or thermoplastic rubber may be provided between the inner peripheral pressing member and the periphery of the through-hole on the inner peripheral surface of the annular covering. According to this configuration, the water-stopping performance between the outer peripheral pressing member and the outer peripheral surface of the annular covering can be further enhanced by the sealing material, and the water-stopping performance between the inner peripheral pressing member and the inner peripheral surface of the annular covering can be further enhanced by the sealing material.

[0011] Further, by filling a part of the sealing material into the through hole of the annular covering body and interposing it between the inner peripheral surface of the through hole and the outer peripheral surface of the cylindrical member, the water stoppage property between the inner peripheral surface of the through hole and the outer peripheral surface of the cylindrical member can be further enhanced.

[0012] Further, a thread groove may be formed on the outer peripheral surface of the cylindrical member. In this case, the fastening member can be configured to include a nut that screws into the thread groove of the cylindrical member. The thread groove may be continuously formed from one axial end portion to the other end portion of the cylindrical member. Thereby, since the screwing range of the nut is expanded, it is possible to cope with the thinning of the annular covering body during fastening, and a high fastening force can be maintained.

Advantages of the Invention

[0013] As described above, according to this configuration, there are a cylindrical member inserted into the through hole formed in the annular covering body, and an outer peripheral side pressing member and an inner peripheral side pressing member made of a metal material that respectively press around the through hole on the outer peripheral surface of the annular covering body and around the through hole on the inner peripheral surface of the annular covering body. Since the outer peripheral side pressing member and the inner peripheral side pressing member are fastened in a direction approaching each other, even if the test fluid is at a high pressure, the water stoppage property between the through hole and the cylindrical member can be enhanced.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0016] FIG. 1 is a diagram for explaining the use of a waterproof test apparatus 1 to which a waterproof structure according to an embodiment of the present invention is applied. This waterproof test apparatus 1 is an apparatus used to confirm on-site whether the waterproofness of the connection part of pipes 101 and 102 satisfies predetermined requirements when a plurality of pipes 101 and 102 are connected on-site to form a water channel or the like. In this embodiment, the case where the first pipe 101 and the second pipe 102 are connected will be described. However, the number of pipes to be connected is not limited to two, and any number of pipes can be used, and the waterproofness of the connection part between any two pipes can be confirmed by the waterproof test apparatus 1. Further, in this embodiment, the case where both the first pipe 101 and the second pipe 102 are circular pipes will be described. However, the present invention can also be applied when the waterproofness of the connection part of pipes other than circular pipes is confirmed by the waterproof test apparatus 1.

[0017] The first pipe 101 and the second pipe 102 may be, for example, pipes made of concrete, pipes made of resin, or pipes made of metal. Further, the first pipe 101 and the second pipe 102 may be existing pipes that have already been installed and are in use, or new pipes.

[0018] The watertightness test device 1 includes an annular covering 10, a first expansion member 20, a second expansion member 30, a fluid supply unit 40, a pipe 50, a supply / discharge device 60, and a measuring instrument 70. The annular covering 10 is formed so as to extend from the inner peripheral surface of the first pipe 101 to the inner peripheral surface of the second pipe 102, and is composed of a rubber member having an annular shape along both of the inner peripheral surfaces, and has water impermeability. The outer peripheral length of the annular covering 10 corresponds to the inner peripheral lengths of the first pipe 101 and the second pipe 102 for which the watertightness test is to be performed. If the first pipe 101 and the second pipe 102 have a small diameter, the outer peripheral length of the annular covering 10 is shortened accordingly, and if the first pipe 101 and the second pipe 102 have a large diameter, the outer peripheral length of the annular covering 10 is lengthened accordingly. The same applies to the peripheral lengths of the first expansion member 20 and the second expansion member 30.

[0019] FIG. 2 shows cross-sections of the annular covering 10, the first expansion member 20, the second expansion member 30, the first pipe 101, and the second pipe 102. In this FIG. 2, a gap S is formed between the first pipe 101 and the second pipe 102, but this gap S may not be formed. The width direction of the annular covering 10 is the left-right direction in FIG. 2 and corresponds to the direction in which the first pipe 101 and the second pipe 102 are arranged (pipe axis direction). The thickness direction of the annular covering 10 is the up-down direction in FIG. 2 and corresponds to the wall thickness direction of the first pipe 101 and the second pipe 102.

[0020] On the outer peripheral surface (the lower surface in FIG. 2) of the annular covering 10, a plurality of first ridge portions 11 are formed on the side of the first pipe 101. The plurality of first ridge portions 11 are arranged at intervals in the width direction of the annular covering 10. Each first ridge portion 11 extends continuously over the entire circumference in the circumferential direction of the annular covering 10. On the side of the second pipe 102 of the outer peripheral surface of the annular covering 10, a plurality of second ridge portions 12 are formed in the same manner as the first ridge portions 11. The plurality of second ridge portions 12 are arranged at intervals in the width direction of the annular covering 10. Each second ridge portion 12 extends continuously over the entire circumference in the circumferential direction of the annular covering 10. The first ridge portions 11 and the second ridge portions 12 are in contact with the inner peripheral surfaces of the first pipe 101 and the second pipe 102, respectively. The first ridge portions 11 and the second ridge portions 12 may be formed as necessary and may be omitted.

[0021] At the end of the annular covering 10 on the side of the first pipe 101, a first lip-shaped portion 13 is formed. The first lip-shaped portion 13 protrudes in a direction approaching the inner peripheral surface of the first pipe 101 and extends continuously over the entire circumference in the circumferential direction of the annular covering 10. At the end of the annular covering 10 on the side of the second pipe 102, a second lip-shaped portion 14 is formed. The second lip-shaped portion 14 protrudes in a direction approaching the inner peripheral surface of the second pipe 102 and extends continuously over the entire circumference in the circumferential direction of the annular covering 10. The first lip-shaped portion 13 and the second lip-shaped portion 14 are in contact with the inner peripheral surfaces of the first pipe 101 and the second pipe 102, respectively. The first lip-shaped portion 13 and the second lip-shaped portion 14 may be formed as necessary and may be omitted.

[0022] On the inner peripheral surface (the upper surface in FIG. 2) of the annular covering 10, a first recess 15 is formed on the side of the first pipe 101. The first recess 15 is continuously formed over the entire circumference in the circumferential direction of the annular covering 10, and a first expansion member 20 is adapted to fit into the first recess 15. The first recess 15 and the first ridge portion 11 are arranged to correspond to each other in the front-back direction (thickness direction) of the annular covering 10, and the first ridge portion 11 is located directly behind the first recess 15.

[0023] A second recess 16 is formed on the inner peripheral surface of the annular covering 10 on the side of the second tube 102. The second recess 16 is continuously formed over the entire circumference in the circumferential direction of the annular covering 10, and the second expansion member 30 is fitted into the second recess 16. The second recess 16 and the second ridge portion 12 are arranged to correspond to each other in the front-back direction (thickness direction) of the annular covering 10, and the second ridge portion 12 is located directly behind the second recess 16.

[0024] In a portion closer to the center in the width direction than the first recess 15 of the annular covering 10, a first bulging portion 10a that bulges inward of the annular covering 10 is formed. Also, in a portion closer to the center in the width direction than the second recess 16 of the annular covering 10, a second bulging portion 10b that bulges inward of the annular covering 10 is formed. Further, in a portion closer to the center in the width direction than the first bulging portion 10a of the annular covering 10, a third bulging portion 10c that bulges outward of the annular covering 10 is formed. Moreover, in a portion closer to the center in the width direction than the second bulging portion 10b of the annular covering 10, a fourth bulging portion 10d that bulges outward of the annular covering 10 is formed. The first bulging portion 10a, the second bulging portion 10b, the third bulging portion 10c, and the fourth bulging portion 10d are continuous over the entire circumference in the circumferential direction of the annular covering 10. The center in the width direction of the annular covering 10 is the portion between the third bulging portion 10c and the fourth bulging portion 10d.

[0025] The annular covering 10 includes a reinforcing material 17. The reinforcing material 17 is composed of, for example, a mesh made of fibers having almost no stretchability such as aramid fibers. The reinforcing material 17 is provided along the inner peripheral surface of the annular covering 10 over the entire circumference and is continuously provided from inside the first recess 15 to inside the second recess 16. The reinforcing material 17 may be provided as needed, and the range in which the reinforcing material 17 is provided can also be set to an arbitrary range. In this embodiment, the reinforcing material 17 is provided so as to include the portion where the fluid supply portion 40 is provided (the center in the width direction of the annular covering 10). The reinforcing material 17 may be embedded in the middle portion in the thickness direction of the annular covering 10.

[0026] A fluid supply part 40 is provided at the central part in the width direction of the annular covering 10. The fluid supply part 40 is a part for supplying a test fluid from the outside to a space R formed between the outer peripheral surface of the annular covering 10 and the first pipe 101 and the second pipe 102. When a gap S is formed between the first pipe 101 and the second pipe 102, the gap S is included in the space R. Further, the space R is formed between the first ridge part 11 and the second ridge part 12. The test fluid is, for example, water, but is not limited to water, and various fluids can be used as the test fluid.

[0027] As shown in FIG. 3, the fluid supply part 40 includes a cylindrical member 41 formed in a cylindrical shape, an outer peripheral side sealing member 42, an outer peripheral side pressing member 43, an inner peripheral side sealing member 44, an inner peripheral side pressing member 45, and a fastening member 46. As shown in FIG. 4, in the central part in the width direction of the annular covering 10, a through hole 18 penetrating the annular covering 10 in the thickness direction is formed in a part where the fluid supply part 40 is provided. The through hole 18 is circular, and the diameter of the through hole 18 is set to be the same as the outer diameter of the cylindrical member 41 or smaller than the outer diameter of the cylindrical member 41.

[0028] The cylindrical member 41 is a member inserted into the through hole 18 of the annular covering 10, and is made of a member having high rigidity and high strength such as metal, for example. The length of the cylindrical member 41 is set to be longer than the thickness dimension of the annular covering 10, and both axial end portions of the cylindrical member 41 in the state of being inserted into the through hole 18 protrude from the inner peripheral surface and the outer peripheral surface of the annular covering 10, respectively. Both axial end surfaces of the cylindrical member 41 are open.

[0029] A thread groove 41a is formed on the outer peripheral surface of the cylindrical member 41. The entire outer peripheral surface of the cylindrical member 41 is threaded, and the thread groove 41a is continuously formed from one axial end portion to the other end portion of the cylindrical member 41. Note that the thread groove 41a may not be formed in the axial intermediate portion of the cylindrical member 41. In this case, the thread groove 41a is formed in one axial end side portion and the other end side portion of the cylindrical member 41.

[0030] The outer peripheral pressing member 43 is made of a metal material that presses around the through-hole 18 on the outer peripheral surface of the annular covering 10, and has an outer peripheral insertion hole 43a through which the cylindrical member 41 is inserted. The outer shape of the outer peripheral pressing member 43 is circular. Also, the outer peripheral insertion hole 43a is circular, and the diameter of the outer peripheral insertion hole 43a is set to be slightly larger than the outer diameter of the cylindrical member 41. Concavities and convexities may be provided on the surface of the outer peripheral pressing member 43 on the side of the annular covering 10. Thereby, stress concentration locations can be provided by the outer peripheral pressing member 43, and the water stoppage performance can be further improved.

[0031] Examples of the metal material constituting the outer peripheral pressing member 43 include iron, stainless steel, aluminum alloy, etc., but are not limited thereto, and any material having a strength such that it hardly deforms by the fastening force of the fastening member 46 may be used. Also, the thickness of the outer peripheral pressing member 43 can be, for example, 0.5 mm or more, or 1.0 mm or more, but is not particularly limited, and it may have a thickness such that it hardly deforms by the fastening force of the fastening member 46. Also, the outer diameter of the outer peripheral pressing member 43 is set to be 2 times or more, or 3 times or more the diameter of the through-hole 18.

[0032] The inner peripheral pressing member 45 is made of a metal material that presses around the through-hole 18 on the inner peripheral surface of the annular covering 10, and has an inner peripheral insertion hole 45a through which the cylindrical member 41 is inserted. In the present embodiment, since the inner peripheral pressing member 45 and the outer peripheral pressing member 43 are composed of the same member, the outer diameter, inner diameter, and wall thickness of the inner peripheral pressing member 45 and the outer peripheral pressing member 43 are equal. Note that the inner peripheral pressing member 45 and the outer peripheral pressing member 43 may be composed of members having different shapes. For example, the outer diameter of one may be smaller than the outer diameter of the other, the inner diameter of one may be smaller than the inner diameter of the other, or the wall thickness of one may be thinner than the wall thickness of the other.

[0033] The outer peripheral sealing member 42 is a member provided between the outer peripheral pressing member 43 and around the through hole 18 on the outer peripheral surface of the annular covering body 10, and is composed of vulcanized rubber or thermoplastic rubber. In this embodiment, the outer peripheral sealing member 42 has a disc shape and has an outer diameter equal to the outer diameter of the outer peripheral pressing member 43. An insertion hole 44a through which the cylindrical member 41 is inserted is formed in the central portion of the outer peripheral sealing member 42. The insertion hole 44a is circular. The thickness of the outer peripheral sealing member 42 may be the same as the thickness of the outer peripheral pressing member 43, may be thicker than the outer peripheral pressing member 43, or may be thinner.

[0034] The inner peripheral sealing member 44 is a member provided between the inner peripheral pressing member 45 and around the through hole 18 on the outer peripheral surface of the annular covering body 10, and can be the same member as the outer peripheral sealing member 42. The thickness of the inner peripheral sealing member 44 may be the same as the thickness of the inner peripheral pressing member 45, may be thicker than the inner peripheral pressing member 45, or may be thinner. Only one of the inner peripheral sealing member 44 and the outer peripheral sealing member 42 may be provided.

[0035] The fastening member 46 is a member for fastening the outer peripheral pressing member 43 and the inner peripheral pressing member 45 in a direction approaching each other. That is, the length of the cylindrical member 41 is set to be longer than the dimension obtained by adding the thickness of the annular covering body 10, the thickness of the outer peripheral sealing member 42, the thickness of the outer peripheral pressing member 43, the thickness of the inner peripheral sealing member 44, and the thickness of the inner peripheral pressing member 45. The fastening member 46 includes a nut 47 and a socket 48 that are screwed into the thread groove 41a of the cylindrical member 41. The nut 47 is a member that is screwed onto the outer peripheral side of the annular covering body 10 in the cylindrical member 41 and is arranged so as to contact the outer peripheral pressing member 43. The nut 47 is composed of a thin nut having an axial dimension of, for example, 10 mm or less, or 8 mm or less. A groove extending in the radial direction may be formed on the surface of the nut 47 on the side opposite to the outer peripheral pressing member 43. Thereby, the test fluid flowing out from the cylindrical member 41 can be supplied to the space R through the groove of the nut 47.

[0036] Socket 48 is formed as a cylindrical member made of the same metal as the cylindrical member 41 and is composed of a member with both ends open. Threads that engage with the thread groove 41a of the cylindrical member 41 are formed on the inner peripheral surface of the socket 48. One end of the socket 48 is screwed into the inner peripheral side of the annular cover 10 in the cylindrical member 41 and communicates with the cylindrical member 41. As a result, the space R is connected to the socket 48 via the cylindrical member 41, enabling the flow of fluid from the socket 48 to the space R. As shown by the phantom line in FIG. 2, one end of a test fluid pipe 50 is connected to the other end of the socket 48.

[0037] By tightening the socket 48 and the nut 47, the outer peripheral side pressing member 43 and the inner peripheral side pressing member 45 approach each other. When the outer peripheral side pressing member 43 and the inner peripheral side pressing member 45 approach each other, the outer peripheral side sealing material 42 and the inner peripheral side sealing material 44 are pressed in the thickness direction and deformed. As a result, a part of the outer peripheral side sealing material 42 and the inner peripheral side sealing material 44 is filled into the through hole 18 and intervenes between the inner peripheral surface of the through hole 18 and the outer peripheral surface of the cylindrical member 41.

[0038] The first expansion member 20 can be composed of, for example, a metal annular member. After applying a force in the direction in which the outer diameter of the first expansion member 20 expands and then maintaining the expanded state, the first pipe 101 side on the inner peripheral surface of the annular cover 10 can be pressed against the inner peripheral surface of the first pipe 101. There are multiple types of such expansion members, for example, those disclosed in Patent Document 1 above, and any of them can be used.

[0039] The second expansion member 30 is configured in the same manner as the first expansion member 20. After applying a force in the direction in which the outer diameter of the second expansion member 30 expands and then maintaining the expanded state, the second pipe 102 side on the inner peripheral surface of the annular cover 10 can be pressed against the inner peripheral surface of the second pipe 102.

[0040] As described above, the pipe 50 shown in FIG. 1 is connected to the socket 48 and also to the water supply and drainage device 60. The water supply and drainage device 60 incorporates a pump (not shown) that feeds water as the test fluid into the pipe 50. When an operator performs a predetermined operation, the pump operates to feed water into the pipe 50. The pressure of the water can be adjusted arbitrarily. Further, a measuring instrument 70 is connected to the pipe 50, and the pressure of the test fluid in the pipe 50 can be constantly measured. The operator can grasp the pressure change of the test fluid by looking at the display of the measuring instrument 70. After the test, the test fluid can be discharged from the space R by the water supply and drainage device 60.

[0041] Incidentally, the measuring instrument 70 may be an electronic device. In this case, the pressure change of the test fluid can be automatically recorded, and based on the record, it can be confirmed whether the watertightness satisfies the predetermined requirements.

[0042] (Function and Effect of Embodiment) According to this embodiment, the annular covering 10 is pressed against the inner peripheral surface of the first pipe 101 by the first expanding member 20 and against the inner peripheral surface of the second pipe 102 by the second expanding member 30, thereby completing the installation of the annular covering 10, and a space R is formed between the outer peripheral surface of the annular covering 10 and the first pipe 101 and the second pipe 102. In a state where the space R is formed, the test fluid is supplied into the space R through the cylindrical member 41 of the fluid supply unit 40. The test fluid fills the space R and the space R is filled with the test fluid. By measuring the pressure change of the test fluid in the space R with the measuring instrument 70, the result of the watertightness test can be obtained. The pressure of the test fluid can be, for example, 0.5 MPa or more. During the test, a portion of the pipe 50 on the side of the water supply and drainage device 60 rather than the measuring instrument 70 is closed by a valve (not shown).

[0043] During the test, a high pressure is acting on the space R. However, in this embodiment, since the outer peripheral pressing member 43 and the inner peripheral pressing member 45 of the fluid supply unit 40 are fastened by the fastening member 46, the outer peripheral pressing member 43 presses around the through hole 18 on the outer peripheral surface of the annular covering 10, and the inner peripheral pressing member 45 presses around the through hole 18 on the inner peripheral surface of the annular covering 10. As a result, the periphery of the through hole 18 of the annular covering 10 is pressed in the thickness direction and deformed in the direction of thinning, so that the inner peripheral surface of the through hole 18 closely adheres to the outer peripheral surface of the cylindrical member 41, exhibiting high water tightness.

[0044] In addition, the water tightness between the outer peripheral pressing member 43 and the outer peripheral surface of the annular covering 10 can be further enhanced by the outer peripheral sealing material 42, and the water tightness between the inner peripheral pressing member 45 and the inner peripheral surface of the annular covering 10 can be further enhanced by the inner peripheral sealing material 44.

[0045] Furthermore, since a part of the outer peripheral sealing material 42 and a part of the inner peripheral sealing material 44 are filled in the through hole 18 of the annular covering 10 and are interposed between the inner peripheral surface of the through hole 18 and the outer peripheral surface of the cylindrical member 41, the water tightness can be further enhanced.

[0046] The above-described embodiment is merely an example in all respects and should not be construed in a limiting manner. Furthermore, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

Industrial Applicability

[0047] As described above, the water stop structure of the water tightness test device according to the present disclosure can be used, for example, when a plurality of pipes are connected on site to form a water channel or the like.

Explanation of Reference Numerals

[0048] 1 Water tightness test device 10 Annular covering 18 Through hole 20 First expansion member 30 Second expansion member 40 Fluid supply unit 41 Cylindrical member 41a Thread groove 42 Outer peripheral side sealing material 43 Outer peripheral side pressing member 44 Inner peripheral side sealing material 45 Inner peripheral side pressing member 46 Fastening member 47 Nut 48 Socket 101 First pipe 102 Second pipe

Claims

1. A watertight structure of a watertightness test device for testing the watertightness of a connection portion between a first pipe and a second pipe, An annular covering made of rubber that is formed so as to extend from the inner peripheral surface of the first pipe to the inner peripheral surface of the second pipe and that extends along both inner peripheral surfaces, A first expansion member that presses the first pipe side of the inner peripheral surface of the annular covering against the inner peripheral surface of the first pipe, A second expansion member that presses the second pipe side of the inner peripheral surface of the annular covering against the inner peripheral surface of the second pipe, A fluid supply unit that is provided on the annular covering and that supplies a test fluid to a space formed between the outer peripheral surface of the annular covering and the first pipe and the second pipe, The fluid supply unit includes a cylindrical member that is inserted into a through hole formed in the annular covering, an outer peripheral side pressing member made of a metal material that presses around the through hole on the outer peripheral surface of the annular covering and that has an outer peripheral side insertion hole through which the cylindrical member is inserted, an inner peripheral side pressing member made of a metal material that presses around the through hole on the inner peripheral surface of the annular covering and that has an inner peripheral side insertion hole through which the cylindrical member is inserted, and a fastening member that fastens the outer peripheral side pressing member and the inner peripheral side pressing member in a direction in which they approach each other. A watertight structure of a watertightness test device.

2. In the watertight structure of the watertightness test device according to Claim 1, A sealing material made of vulcanized rubber or thermoplastic rubber is provided at least in one of the space between the outer peripheral side pressing member and the periphery of the through hole on the outer peripheral surface of the annular covering and the space between the inner peripheral side pressing member and the periphery of the through hole on the inner peripheral surface of the annular covering. A watertight structure of a watertightness test device.

3. In the watertight structure of the watertightness test device according to Claim 2, The sealing material is provided in both the space between the outer peripheral side pressing member and the periphery of the through hole on the outer peripheral surface of the annular covering and the space between the inner peripheral side pressing member and the periphery of the through hole on the inner peripheral surface of the annular covering. A watertight structure of a watertightness test device.

4. In the watertight structure of the watertightness test device according to Claim 2, A part of the sealing material is filled in the through hole of the annular covering and is interposed between the inner peripheral surface of the through hole and the outer peripheral surface of the cylindrical member. A watertight structure of a watertightness test device.

5. In the watertight structure of the watertightness test device according to Claim 1, A thread groove is formed on the outer peripheral surface of the cylindrical member, The water stop structure of the watertightness test device, wherein the fastening member includes a nut screwed into the screw groove of the cylindrical member.

6. In the water stop structure of the watertightness test device according to claim 5, The screw groove is continuously formed from one axial end portion to the other end portion of the cylindrical member, and the water stop structure of the watertightness test device.

7. In the water stop structure of the watertightness test device according to claim 5, The nut is screwed onto the outer peripheral side of the annular covering in the cylindrical member, The fastening member includes a socket with both ends open, One end portion of the socket communicates with the cylindrical member in a state where it is screwed onto the inner peripheral side of the annular covering in the cylindrical member, A pipe for test fluid is connected to the other end portion of the socket, and the water stop structure of the watertightness test device.

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