JP5276062B2 - Watertight performance test apparatus and watertight performance test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To examine a water-tight property of a junction between a steel swivel joint ring and tube bodies without reducing an operability even if a distance between end faces of the tube bodies are increased. <P>SOLUTION: A device for examining a water-tight property between opposing tube bodies P, P and a steel swivel joint ring J in a state where the steel swivel joint ring J joins on edge parts on outer peripheral surfaces of the opposing tube bodies P, P comprises an annular frame 2; a plurality of pressing members 3 having arcuate peripheral surfaces extendable and withdrawable in a radial direction with respect to the annular frame 2; an endless seal member 4 installed on the plurality of pressing members 3; and an endless gasket 5 arranged on an internal peripheral surface of the steel swivel joint ring at a preset distance from an end surface of one of the tube bodies P1. The seal member 4 is pressed via the pressing member 3 by an internal peripheral surface side edge part of the one of the tube bodies P1 and an internal peripheral surface of the gasket 5, and a pressurizing water is supplied to an annular space defined by the steel swivel joint ring J, the one of the tube bodies P1, the gasket 5, and the seal member 4 to examine the water-tight property of the joint between the steel swivel joint ring J and the one of the tube bodies P1. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a test apparatus and a test method for testing the watertight performance of a joint between a steel joint and a tubular body.

  In general, a pipe body provided with a receiving opening at one end and an insertion opening provided at the other end, for example, a receiving opening facing a reinforced plastic composite pipe (FRPM pipe) in which glass fiber reinforced plastic and aggregate (mortar) are sequentially laminated. It is practiced to sewage pipes and the like by joining the inserts in order. When constructing pipes such as sewer pipes, if pipes are connected in parallel for each block, the pipe body at the tip of one block and the pipe body at the tip of the other adjacent block are finally connected. It is necessary to join. In such a case, steel joints are fitted over and joined to the outer peripheral surfaces of adjacent and opposing pipe bodies (see, for example, FIG. 10 of Patent Document 1).

  A sealing material is disposed between the inner peripheral surface of the steel joint ring and the outer peripheral surface of each tubular body, and the joint between the steel joint ring and each tubular body is sealed. Therefore, when joining a pipe body via a steel joint, it is necessary to confirm the sealing performance by the sealing material between the steel joint and each pipe. Specifically, a test band provided with an annular packing is disposed between the inner peripheral surface side edge portions of opposing pipe bodies joined via steel joint rings, and the annular packing is attached to the inner circumference of each pipe body. The inner peripheral surface of the opposite pipe body is sealed by pressing each of the surface side edge portions through a pressure plate, and a pressurized fluid, for example, a water pump is applied to the inner peripheral surface side of the steel joint through an annular packing. The pressurized water is supplied through the test piece, and the sealing performance of the joint portion by the sealing material between the steel joint ring and each tubular body is tested (for example, see Patent Document 2).

JP 9-328804 A JP 2000-266630 A

  By the way, when opposing pipes are joined using steel joints, the opening (interval) between the end faces of the opposing pipes increases as the pipe diameter increases. For this reason, in the test apparatus using the test band described above, the test band having a size corresponding to the tube diameter of the tube body, that is, between the end surfaces separated in correspondence with the space between the end surfaces of the opposite tube bodies. Is required. For example, in the case of a tube diameter of 1800 mm, the interval between the end surfaces of the opposite tube bodies is 450 mm, and the width of the test band is required to be 610 mm. On the other hand, if a test band with a large width corresponding to a large gap between the end faces of the pipe body is manufactured, the weight increases and the workability decreases when the pipe is transported in the pipe line, and it passes through the curved part of the pipe line. It can't be done. In addition, the amount of water that must be supplied to the inner peripheral surface side of the steel joint is required, and the test time is inevitably increased.

  The present invention has been made in view of such a problem, and even if the interval between the end faces of the tubular body is increased, the watertight performance of the joint portion between the steel joint ring and the tubular body is not reduced. It is intended to provide a watertight performance test apparatus and a test method thereof.

The water-tightness performance test apparatus of the present invention includes a tubular body and a steel body in a state in which a steel joint ring having an inner diameter corresponding to the outer diameter of the tubular body is joined across the outer peripheral surface side edge of the opposing tubular body having the same outer diameter . In an apparatus for testing watertight performance with a joint ring, an annular frame, a plurality of pressing members each having an arcuate peripheral surface and capable of moving forward and backward in a radial direction with respect to the annular frame, and a plurality of pressing members are mounted. It has a thickness corresponding to the step between the endless seal member and the inner peripheral surface of the steel joint ring and the inner peripheral surface of the pipe body . An endless gasket disposed on the inner peripheral surface, and the seal member is pressed through the pressing member over the inner peripheral surface side edge of one of the tubes and the inner peripheral surface of the gasket, Annular space defined by ring, one tube, gasket and seal member Is characterized in that to test the watertight performance of the joint portion between the pressurized fluid is supplied steel Tsugiwa and one pipe body.

According to the present invention, a gasket having a thickness corresponding to a level difference between the inner peripheral surface of the steel joint and the inner peripheral surface of the tubular body at the joint portion between the steel joint to be tested and the tubular body. After being arranged on the inner peripheral surface of the steel joint at a set interval from the end surface of the steel tube, the pressing member is pushed out in the diameter-expanding direction to extend over the inner peripheral surface side edge of the tubular body and the inner peripheral surface of the gasket. The sealing member is brought into contact and sealed. Next, a pressurized fluid is supplied to the annular space defined by the steel joint, the pipe, the gasket, and the seal member, and the watertight performance of the joint between the steel joint to be tested and the pipe is tested.

  As a result, even if the interval between the end surfaces of the tube increases corresponding to the tube diameter of the tube, the gasket should be arranged on the inner peripheral surface of the steel joint ring at a set interval from the end surface of the tube. Therefore, it is possible to test the watertight performance of the joint at a constant interval without enlarging the test apparatus. Therefore, in the pipeline, the test apparatus can be conveyed to the test position through the curved portion of the pipeline as before, and workability is not reduced. Further, when pressurized water is used as the pressurized fluid, it is not necessary to carry more water corresponding to the interval between the tube bodies to the test position, and the test time does not increase.

In this invention, it is preferable that a supporting member is arrange | positioned between the said gasket and the end surface of the other pipe body. Thereby, it is possible to support the gasket disposed at a set interval from the end surface of one tube body so as not to move in the axial direction via the support member disposed between the end surface of the other tube body. it can. Therefore, there is no possibility that the gasket is unexpectedly shifted in the axial direction and detached, and the watertight performance test can be surely performed. The support member has the same width in the axial direction and distance between the end face and the gasket of another side of the tube.

  In the present invention, it is preferable that the gasket is formed of two inner and outer layers, and the hardness of the outer layer is smaller than the hardness of the inner layer. As a result, even if the weld bead or the like bulges or has irregularities on the inner peripheral surface of the steel joint, the outer layer can absorb them, and the gasket and the steel joint The sealing performance between the inner peripheral surfaces can be ensured. Further, when the sealing member is pressed against the gasket via the pressing member, a constant reaction force can be obtained depending on the hardness of the inner layer, and excessive compression deformation can be prevented.

  In the present invention, it is preferable that the gasket is formed of three layers in which an intermediate layer is sandwiched between inner and outer support layers, and the hardness of both support layers is smaller than the hardness of the intermediate layer. As a result, even if a weld bead or the like bulges on the inner peripheral surface of the steel joint ring or there are irregularities, the outer holding layer can absorb these, and the gasket and the steel The sealability between the inner peripheral surfaces of the joint ring can be ensured. Further, when the sealing member is pressed against the gasket via the pressing member, a certain reaction force can be obtained by the hardness of the intermediate layer through the inner holding layer, and excessive compression deformation can be prevented.

The water-tightness performance test method of the present invention includes a tubular body and a steel body in a state where a steel joint ring having an inner diameter corresponding to the outer diameter of the tubular body is joined across the outer peripheral surface side edge of the opposing tubular body having the same outer diameter . a method of testing a watertight performance of the Tsugiwa, at a set interval gasket having a thickness corresponding to the step between the inner peripheral surface of the inner peripheral surface and the tube of the steel Tsugiwa from the end face of one of the tubular body The steel joint is disposed on the inner peripheral surface of the steel joint ring, and the space between the inner peripheral surface side edge of one tubular body and the inner peripheral surface of the gasket is sealed through a sealing member. The pressurized fluid is supplied through the seal member to the annular space defined by the tube body, the gasket, and the seal member, and the watertight performance of the joint portion between the steel joint and one tube body is tested. Is.

According to the present invention, at the joint between the steel joint to be tested and the tubular body, the inner circumferential surface of the steel joint and the inner circumferential surface of the tubular body at a set interval from the end face of one tubular body. After disposing a gasket having a thickness corresponding to the difference in level on the inner peripheral surface of the steel joint ring, a gap between the inner peripheral surface side edge of one tubular body and the inner peripheral surface of the gasket is interposed via a seal member. And seal. Next, the pressurized fluid is supplied through the seal member to the annular space defined by the steel joint, the one pipe body, the gasket, and the seal member, and the watertight performance of the joint between the steel joint and the one pipe body. To test.

  As a result, even if the interval between the end surfaces of the tube increases corresponding to the tube diameter of the tube, the gasket should be arranged on the inner peripheral surface of the steel joint ring at a set interval from the end surface of the tube. Therefore, it is possible to test the watertight performance of the joint at a constant interval. Therefore, it is not necessary to increase the size of the sealing member or the like in accordance with the interval between the end faces of the tube body, the test can be performed in the same manner as before, and workability is not deteriorated.

The water-tightness performance test method of the present invention includes a tubular body and a steel body in a state where a steel joint ring having an inner diameter corresponding to the outer diameter of the tubular body is joined across the outer peripheral surface side edge of the opposing tubular body having the same outer diameter . a method of testing a watertight performance of the Tsugiwa, at a set interval gasket having a thickness corresponding to the step between the inner peripheral surface of the inner peripheral surface and the tube of the steel Tsugiwa from the end face of one of the tubular body The steel joint is disposed on the inner peripheral surface of the steel joint ring, and the space between the inner peripheral surface side edge of one tubular body and the inner peripheral surface of the gasket is sealed through a sealing member. of the tube, supplies pressurized fluid through the seal member to an annular space which is partitioned by a gasket and a sealing member, to test the watertight performance of the joint portion between the steel Tsugiwa and one pipe body, then, the gasket Is disposed on the inner peripheral surface of the steel joint at a set interval from the end surface of the other pipe body, The inner peripheral surface side edge of the tube body and the inner peripheral surface of the gasket are sealed with a seal member, and the annular space defined by the steel joint, the other tube body, the gasket, and the seal member is formed. A pressurized fluid is supplied through the seal member, and the watertight performance of the joint between the steel joint and the other pipe is tested.

According to the present invention, at the joint between the steel joint to be tested and the tubular body, the inner circumferential surface of the steel joint and the inner circumferential surface of the tubular body at a set interval from the end face of one tubular body. After disposing a gasket having a thickness corresponding to the difference in level on the inner peripheral surface of the steel joint ring, a gap between the inner peripheral surface side edge of one tubular body and the inner peripheral surface of the gasket is interposed via a seal member. And seal. Next, the pressurized fluid is supplied through the seal member to the annular space defined by the steel joint, the one pipe body, the gasket, and the seal member, and the watertight performance of the joint between the steel joint and the one pipe body. To test. When the test for watertightness of the joint between the steel joint and one pipe is completed, the gasket is arranged on the inner peripheral surface of the steel joint at a set interval from the end face of the other pipe. After the installation, the gap between the inner peripheral surface side edge of the other tubular body and the inner peripheral surface of the gasket is sealed through a seal member. Next, pressurized fluid is supplied through the seal member to the annular space defined by the steel joint, the other tube, the gasket, and the seal member, and the watertight performance of the joint between the steel joint and the other tube. To test.

  As a result, even if the interval between the end surfaces of the tube increases corresponding to the tube diameter of the tube, the gasket should be arranged on the inner peripheral surface of the steel joint ring at a set interval from the end surface of the tube. Therefore, it is possible to test the watertight performance of the joint at a constant interval. Therefore, it is not necessary to increase the size of the sealing member or the like in accordance with the interval between the end faces of the tube body, the test can be performed in the same manner as before, and workability is not deteriorated.

  ADVANTAGE OF THE INVENTION According to this invention, even if the space | interval between the end surfaces of a pipe body becomes large, the watertight performance of the junction part of a steel joint ring and a pipe body can be tested, without reducing workability | operativity.

It is a front view which shows one Embodiment of the watertight performance test apparatus of this invention with a tubular body. FIG. 2 is a side view showing the test apparatus of FIG. It is an expanded sectional view of the principal part which abbreviate | omits and shows the test state of the watertight performance of the junction part of a steel joint ring and one pipe body. It is a longitudinal cross-sectional view of FIG. It is a perspective view which abbreviate | omits and shows the test state shown in FIG. It is a longitudinal cross-sectional view which shows the test state of the watertight performance of the junction part of a steel joint ring and the other pipe body corresponding to FIG. It is sectional drawing explaining the connection state by the connection jig of a unit spacer.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment of a watertight performance test apparatus 1 according to the present invention.

  The watertight performance test apparatus 1 is mounted over an annular frame 2, a plurality of pressing members 3 having an arcuate peripheral surface and capable of moving forward and backward in the radial direction with respect to the annular frame 2, and a plurality of pressing members 3. An endless seal member 4, an endless gasket 5 disposed on the inner peripheral surface of the steel joint J, and an axial direction of the gasket 5 disposed between the gasket 5 and the end surface of the pipe P And a supporting member 6 for preventing the movement of the lens. The left and right wheel bases 7 rotatably supporting the front and rear wheels 7a are removably connected to the annular frame 2 via bolts and nuts (not shown), and connected to the front and rear of the left and right wheel bases 7 respectively. 71 is detachably connected via a bolt and nut (not shown).

  The annular frame 2 has a plurality of shallow box-like shapes (in the embodiment, three at intervals of 120 degrees) formed by extending a peripheral wall on the inner peripheral surface side periphery of the outer surface plate 21 curved in an arc shape. The segments 2A are sequentially connected in the circumferential direction via bolts and nuts. A plurality of nuts 22 are welded to the annular frame 2 through the outer surface plate 21 of the segment 2A at a set interval in the circumferential direction corresponding to the plurality of pressing members 3, respectively. Bolts 23 are screwed together. Further, on the outer surface plate 21 of the segment 2 </ b> A in the annular frame 2, as will be described later, a guide hole 21 a through which a pair of guide rods 35 provided in each pressing member 3 can be inserted is point-symmetric with respect to the center of the nut 22. Formed in position.

  Each pressing member 3 connects a seal holding member 32 having a U-shaped cross section to the outer peripheral surface side of the arc-shaped pressing plate 31 and a pair of reinforcements spaced in the axial direction on the inner peripheral surface side of the pressing plate 31. Ribs 33 are formed upright. A pressing portion 34 against which the tip of the bolt 23 provided on the annular frame 2 is abutted is provided at the center portion of the holding plate 31, while each reinforcing rib 33 is provided on the outer surface plate 21 of the segment 2 </ b> A in the annular frame 2. A pair of guide rods 35 are welded to point-symmetrical positions with respect to the center of the pressing portion 34 so as to protrude inward corresponding to the guide holes 21a formed in the above.

  As shown in FIG. 4, the seal member 4 is formed in a substantially flat C shape with a contact portion 4 a protruding at positions separated from each other on the left and right sides, and is mounted over the seal holding member 32 of the pressing member 3. As will be described later, the seal member 4 is provided on the inner peripheral surface side edge of the pipe P and in the vicinity of the end surface of the pipe P, and is disposed on the inner peripheral surface of the steel joint J. The left and right contact portions 4a have a width that allows them to contact each other.

  The gasket 5 is disposed on the inner peripheral surface of the steel joint J over the entire circumference, and corresponds to the step so as to fill the step between the inner peripheral surface of the steel joint J and the inner peripheral surface of the pipe P. The cross section is formed in a square shape.

Here, the gasket 5 is made of chloroprene rubber, styrene-butadiene rubber or the like, and has a two-layer structure of an inner layer 5A and an outer layer 5B. And the inner layer 5A is JIS K
The hardness measured in accordance with 6253 “Vulcanized Rubber and Thermoplastic Rubber—How to Obtain Hardness” is 65 to 75, preferably 70, and the hardness of the outer layer 5B is 40 to 50, preferably 45. Thus, the thickness of the inner layer 5A is set larger than the thickness of the outer layer 5B. Thereby, even if the weld bead bulges on the inner peripheral surface of the steel joint J, the bulge of the weld bead can be absorbed because the hardness of the outer layer 5B is small (soft). Moreover, when the inner layer 5A has a large hardness (hard), as will be described later, a constant reaction force is obtained when the inner layer 5A is pressed by the pressing member 3 via the seal member 4, and excessive deformation due to the pressing is prevented. Can do.

  As shown in detail in FIG. 5, the support member 6 includes a plurality of shallow box-shaped unit spacers 6 </ b> A formed by extending a peripheral wall on the inner surface side peripheral edge of the arc-shaped outer surface plate in the circumferential direction via bolts and nuts. They are connected in order to form a ring. The unit spacer 6A is provided with a support plate 61 that can be advanced and retracted via bolts and nuts with respect to one peripheral wall in the axial direction. As a result, the support member 6 has a steel joint J between the gasket 5 disposed on the inner peripheral surface of the steel joint J and the end face of the pipe P facing the pipe P to be tested. Is arranged in an annular shape on the inner peripheral surface of the, and supports the side surface of the gasket 5 to prevent movement in the axial direction.

  In this case, among the unit spacers 6A of the support member 6, the unit spacers 6A disposed on the pipe bottom portion of the steel joint J have left and right wheel bases 7 provided on the annular frame 2 as shown in FIG. A pair of transfer plates 62 are arranged at intervals to correspond to the wheels 7a. Since the left and right wheels 7a, 7a of the wheel base 7 cross over the transfer plates 62, 62, the test apparatus 1 can be smoothly moved between the opposing pipe bodies P, P via the transfer plate 62.

  Next, a case where the watertight performance of the joint portion between the steel joint J and the pipe P is tested using the test apparatus 1 configured as described above will be described.

  Here, the opposing pipe bodies P, P are fitted with and joined to the steel joint J over the outer peripheral faces thereof, and the inner peripheral face of the steel joint J and the outer peripheral faces of the pipes P, P A sealing material S is disposed between the steel joints J and the pipes P and P are sealed (see FIG. 4).

  Through the manhole close to the joint between the steel joint J to be tested and the pipe P, the segment 2A of the annular frame 2, the plurality of pressing members 3, the wheel base 7, the connecting arm 71, the seal member 4, the gasket 5, The unit spacer 6A and the like of the support member 6 are carried into the pipeline. In the pipe line, the wheel base 7 is connected to the segment 2A disposed below the annular frame 2 via bolts and nuts, and the front and rear connecting arms 71 are connected to the left and right wheel bases 7 via bolts and nuts. And connect them so that they can run in the pipeline.

  In this state, the vehicle travels in the pipeline and transports the lower segment 2A to the vicinity of the position where the watertight performance of the joint between the steel joint J and the pipe P is tested. At the same time, other segments 2A and a plurality of holding members 3 are transported to the vicinity of the test position using a cart not shown, and although not shown in detail, it is necessary for a pump cart with a tank and a hand pump and for testing. Water is also transported to the vicinity of the test position using a plurality of plastic tanks.

  When the vicinity of the test position is reached, the segment 2A is sequentially connected to the lower segment 2A via a bolt and nut to form the annular frame 2. Next, the pair of guide rods 35 of the pressing member 3 are inserted into the guide holes 21 a formed in the outer surface plate 21 of each segment 2 </ b> A in the annular frame 2, and the plurality of pressing members 3 are attached in order in the circumferential direction of the annular frame 2. Next, the seal member 4 is wound around and mounted on the seal holding members 32 of the plurality of pressing members 3.

  In this case, the bolt 23 screwed to the annular frame 2 is set to have a small protruding amount from the outer surface plate 21, and the pressing member 3 with which the pressing portion 34 is abutted against the tip is supported at the reduced diameter position. Therefore, the seal member 4 can be easily wound around the seal holding member 32 of the pressing member 3.

  On the other hand, the gasket 5 is disposed on the inner peripheral surface of the steel joint J in the vicinity of the end face of the one pipe P1, corresponding to the joint between the steel joint J to be tested and the one pipe P1. To do. Next, the unit spacer 6A of the support member 6 is arranged on the pipe bottom of the steel joint J between the end face of the gasket 5 and the other pipe body P2, and the unit spacers 6A are sequentially arranged in the circumferential direction with reference to the unit spacer 6A. The support member 6 is assembled by connecting via bolts and nuts and forming an annular shape. At this time, in the process of forming the support member 6 by sequentially connecting the unit spacers 6A, the support plate 61 is protruded from the peripheral wall of the unit spacer 6A via the bolt and nut, and is abutted against the end face of the other tubular body P2. By adjusting the protruding length of the plate 61, the side surface of the gasket 5 is supported so that the interval between the end surfaces of the gasket 5 and the one tubular body P1 is set.

  Next, after slightly moving the test device 1 to the test position to stop the wheel 7a, the bolts 23 provided on the annular frame 2 are screwed to protrude from the outer plate 21, and the corresponding pressing portions 3 of the respective pressing members 3 are pressed. By pressing, the contact portion 4a of the seal member 4 is pushed outward so as to come into contact with the inner peripheral surface side edge of the one tubular body P1 and the inner peripheral surface of the gasket 5. Similarly, the plurality of pressing members 3 are pushed out almost equally for each pressing member 3 facing 180 degrees, and all the pressing members 3 are pushed out, so that the contact portion 4a of the seal member 4 is placed inside one pipe P1. The peripheral edge of the peripheral surface side and the inner peripheral surface of the gasket 5 are brought into contact with each other almost uniformly and compressed and deformed, and the inner peripheral surface of one pipe P1 and the inner peripheral surface of the gasket 5 are sealed.

  Thereafter, a water injection port (not shown) provided in the lower pressing member 3 and a discharge port of the hand pump are connected by piping, the water in the tank is pressurized by operating the hand pump, and the steel joint J, It is supplied to an annular space defined by the pipe body P1, the gasket 5 and the seal member 4. When pressurized water is filled in the annular space by supplying pressurized water, it can be confirmed that the pressurized water leaks from an air vent hole (not shown) provided in the upper pressing member 3 and is filled over the entire circumference. Thereafter, the air vent hole is closed, the hand pump is further operated, and pressurized water is supplied until the set pressure is reached. The pressure of the pressurized water can be grasped by a pressure gauge provided in a pipe connected to the discharge port of the hand pump.

  The quality of the water tightness of the joint between the steel joint J and one pipe P1 has sufficient water tightness if no pressure drop occurs even after the set time has elapsed after supplying pressurized water to the set pressure. Can be judged. Further, if the joint portion can be observed externally, it can also be confirmed by the presence or absence of water leakage to the outer peripheral surface of one tube P1.

  Thus, if the watertight performance of the joint part of the steel joint J and one pipe P1 was tested, after the water was collected in the tank through the water inlet, the bolts 23 were loosened, and the holding member 3 After releasing the pressure on the inner peripheral surface of one pipe body P1 of the seal member 4 and the inner peripheral surface of the gasket 5 and moving the pressing member 3 to the reduced diameter position, the test apparatus 1 is slightly moved from the test position. Let Next, the interval between the adjacent unit spacers 6A is narrowed so that the whole is smaller than the inner diameter of the tube P, and then the gasket 5 is moved so as to approach the end surface of the other tube P2. Then, after rotating the support member 6 180 degrees so that the front and rear are interchanged in the pipe line, the diameter of the adjacent unit spacers 6A is increased to increase the diameter, and the whole contacts the inner peripheral surface of the steel joint J. Let Further, the gap between the gasket 5 and the end face of the other tubular body P1 is adjusted to the set distance along the peripheral wall on the side facing the peripheral wall provided with the support plate 61 of the support member 6.

  Then, if the bolt 23 is tightened and the contact portion 4a of the seal member 4 is pressed against the inner peripheral surface side edge of the other tubular body P2 and the inner peripheral surface of the gasket 5 through the pressing member 3, As described above, pressurized water is supplied to the annular space defined by the steel joint J, the other pipe P2, the gasket 5, and the seal member 4 through the water inlet, and the steel joint J and the other pipe P2 are supplied. Test the watertight performance of the joint with.

  In this manner, when the test of the watertight performance of the joint portion between the pipe body P and the steel joint J is completed, the test may be performed again by transporting to the next test position.

  As a result, even if the pipe diameter of the pipe body P is increased and the interval between the end faces of the pipe body P is increased, the gasket 5 is placed at a set interval on the end face of the pipe body P to be tested. By arranging the test apparatus 1 on the inner peripheral surface, it becomes possible to always perform tests at regular intervals without increasing the size of the test apparatus 1. Therefore, when the test apparatus 1 is transported in the pipeline, it is the same as before. It can be conveyed through the curved part of the pipeline. Further, the amount of water required for the test is constant regardless of the interval between the end faces of the tube, and it is not necessary to carry a large amount of water to the test position, and the test time is not prolonged.

  In the embodiment described above, the annular support member 6 formed by connecting a plurality of unit spacers 6A is used to prevent the gasket 5 from moving in the axial direction. Depending on the interval, a support member is not always necessary, and a plate member, a bar, or the like may be disposed in the circumferential direction between the end face of the tube P and the gasket 5 to provide a support member.

  In the above-described embodiment, the gasket 5 is exemplified by the two-layer structure including the inner layer 5A and the outer layer 5B. However, the three-layer structure in which the intermediate layer having a higher hardness is sandwiched between the inner and outer holding layers having the same hardness and a lower hardness. It doesn't matter.

  Furthermore, although the case where unit spacer 6A, 6A which comprises the supporting member 6 is connected via a volt | bolt nut was illustrated, the connection jig as shown in FIG. 7 is also employable.

  Furthermore, although the case where pressurized water was supplied and the watertight performance of a joint part was tested was demonstrated, you may utilize compressed air as a pressurized fluid.

DESCRIPTION OF SYMBOLS 1 Test apparatus 2 Annular frame 2A Segment 3 Holding member 4 Sealing member 4a Contact part 5 Gasket 5A Inner layer 5B Outer layer 6 Support member 6A Unit spacer 7 Wheel base P Pipe body J Steel joint

Claims (6)

Test the watertight performance of the tubular body and steel joint with the steel joint having an inner diameter corresponding to the outer diameter of the tubular body joined to the outer peripheral surface side edge of the opposite tubular body having the same outer diameter. In the apparatus, an annular frame, a plurality of pressing members each having an arcuate peripheral surface and capable of moving forward and backward in the radial direction with respect to the annular frame, an endless seal member mounted over the plurality of pressing members, and steel Endless having a thickness corresponding to the step between the inner peripheral surface of the joint ring and the inner peripheral surface of the pipe, and disposed on the inner peripheral surface of the steel joint at a set interval from the end face of one of the pipes The seal member is pressed through the pressing member over the inner peripheral surface side edge of the one tubular body and the inner peripheral surface of the gasket, and the steel joint ring, one tubular body, the gasket and Steel joint by supplying pressurized fluid to the annular space defined by the seal member Watertight performance test apparatus characterized by testing the watertight performance of the joint between one pipe body.   The watertight performance test apparatus according to claim 1, wherein a support member is disposed between the gasket and an end face of the other tubular body.   2. The watertight performance test apparatus according to claim 1, wherein the gasket is formed of two layers of inner and outer layers, and the hardness of the outer layer is smaller than the hardness of the inner layer.   The watertight performance test apparatus according to claim 1, wherein the gasket is formed of three layers in which an intermediate layer is sandwiched between inner and outer support layers, and the hardness of both support layers is smaller than the hardness of the intermediate layer. apparatus. Test the watertight performance of the tubular body and steel joint with the steel joint having an inner diameter corresponding to the outer diameter of the tubular body joined to the outer peripheral surface side edge of the opposite tubular body having the same outer diameter. in the method, the inner peripheral surface and the tube inner peripheral surface of the steel Tsugiwa at a set interval gasket from the end face of one of the tube having a thickness corresponding to the step between the inner peripheral surface of the steel Tsugiwa And between the inner peripheral surface side edge of one tube body and the inner peripheral surface of the gasket is sealed through a seal member, and the steel joint ring, one tube body, the gasket and the seal member A water-tight performance test method characterized in that a pressurized fluid is supplied to a partitioned annular space through a seal member to test the water-tight performance of a joint between a steel joint and one pipe body. Test the watertight performance of the tubular body and steel joint with the steel joint having an inner diameter corresponding to the outer diameter of the tubular body joined to the outer peripheral surface side edge of the opposite tubular body having the same outer diameter. in the method, the inner peripheral surface and the tube inner peripheral surface of the steel Tsugiwa at a set interval gasket from the end face of one of the tube having a thickness corresponding to the step between the inner peripheral surface of the steel Tsugiwa And between the inner peripheral surface side edge of one tube body and the inner peripheral surface of the gasket is sealed through a seal member, and the steel joint ring, one tube body, the gasket and the seal member the pressurized fluid supplied through the seal member in the space compartmented annular tested the watertight performance of the joint portion between the steel Tsugiwa and one pipe body, then sets the gasket from the end face of the other tube Arranged on the inner peripheral surface of the steel joint at an interval, the inner peripheral surface side edge of the other pipe body and the gas A space between the inner peripheral surface of the steel plate and the inner peripheral surface of the steel plate through a seal member, and a pressurized fluid is supplied to the annular space defined by the steel joint, the other pipe, the gasket and the seal member through the seal member; A method for testing watertightness, comprising testing the watertightness of a joint between a steel joint and the other pipe.

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