JP2023142667A - Pipe joint water-pressure test device - Google Patents

Abstract

To provide a pipe joint water-pressure test device that prevents wear of an elastic ring to secure water tightness.SOLUTION: A pipe joint water-pressure test device has: a main part 5; a first water cut-off unit 6 that is provided in an outer face on one end side in a pipe axis direction of the main part 5, and is tightly contactable with an inner face of a pipe 2 of jointed one, over a whole circumference in a circumferential direction; a second water cut-off unit 7 that is provided in an outer face on the other end side in the pipe axis direction of the main part 5, and is tightly contactable with an inner face of a pipe 3 of jointed other, over a whole circumference in the circumferential direction; and an extrusion device 8 that generates extrusion force along the pipe axis direction. Both water cut-off units 6 and 7 are configured to have: a fixing flange 11 that is fixed to the outer face of the main part 5; an oscillation flange 12 that can oscillate in the pipe axis direction by the extrusion force of the extrusion device 8, and is provided with a space separated from the fixing flange 11 in the pipe axis direction; and an elastic ring 13 that is provided so as to be across the fixing flange 11 and the oscillation flange 12, and deforms outward accompanied by approach of the fixing flange 11 and the oscillation flange 12 in the pipe axis direction to abut with the inner faces of the pipes 2 and 3.SELECTED DRAWING: Figure 3

Description

The present invention relates to a water pressure testing device for pipe joints.

In water and sewage or industrial water pipelines constructed with ductile iron pipes, etc., after the joint work is completed, water pressure is A test is conducted in which a load (for example, a pressure of 0.5 MPa) is applied. In the case of a large-diameter pipe with a nominal diameter of 900 or more (in some cases, the nominal diameter is 800 or 700), for example, a hydraulic test device according to Patent Document 1 below can be employed.

In the test using this water pressure testing device, first, a sealing material 5 (rubber ring) having a U-shaped circumferential cross section is placed on the inner surface of the pipe joint 1, and a water stop plate 8 is applied to the inner surface. Next, the water stop plate 8 is pressed outward by the reaction force plates 20 and 21 which are drawn outward in the pipe radial direction by the operation of the set screw 22, and this pressing force causes the tongue-shaped portion 7 of the sealing material 5 to be pushed into the socket. 2 and the inner surface of the socket 3, and an annular sealed space 33 for pressurized water filling is formed in the pipe joint part 1 (see Fig. 1, Fig. 7(b), etc. of Patent Document 1). ).

The test according to Patent Document 1 requires an operator to enter the pipe and operate the set screw 22, so it is difficult to apply to small diameter pipes in which the operator cannot enter. For this reason, in the case of small-diameter pipes, a test method in which the pipe is directly filled with water is often adopted. However, even small-diameter pipes require a large amount of water depending on the length of the construction section, although not as much as large-diameter pipes, which poses a problem in terms of cost.

As a test device that can be applied to small-diameter pipes, for example, a watertightness testing device according to Patent Document 2 below has been proposed. In this watertightness testing device, a first sealing device 10 is arranged facing the inner peripheral surface 4 of one of the joined pipes 1 and 5, and a first sealing device 10 is arranged facing the inner peripheral surface 7 of the other pipe 5. A second seal member 20 is arranged. The seal devices 10, 20 have ring bodies 11, 12, 21, 22 inserted through a support shaft 31, and ring-shaped seal bodies 15, 25 are provided between the ring bodies 11, 12, 21, 22. It is being When the two wheels 11, 12, 21, 22 move relatively toward each other, the seal bodies 15, 25 (elastic rings) expand in diameter and come into pressure contact with the inner circumferential surfaces 4, 7.

The rings 11 , 12 , 21 , 22 of both sealing devices 10 , 20 are configured to be moved toward each other by means of an actuation device 40 . This actuating device includes a hydraulic jack 41 disposed between one seal device 10 and the base plate 30, a transmission body 42 disposed between both seal devices 10 and 20, and the like. A pin 32 is provided at the free end of the support shaft 31 to restrict the movement limit of the wheel body 22.

When the hydraulic jack 41 is extended, the first sealing device 10 moves toward the second sealing device 20 while being guided by the support shaft 31, and first, the wheel body 12 of the first sealing device 10 is installed on the transmission body 42. The transmission body 42 comes into contact with the rubber packing 43 and moves together. Next, the rubber packing 44 on the opposite side of the transmission body 42 comes into contact with the wheel body 21 of the second sealing device 20 . In this state, when the hydraulic jack 41 is further extended, the pair of rings 11, 12, 21, 22 of both seal devices 10, 20 move relatively toward each other, and the diameter of the seal bodies 15, 25 is expanded. Moving outward, the outer circumferential surfaces 18, 28 of the seal bodies 15, 25 are brought into pressure contact with the inner circumferential surfaces 4, 7 of the tubes 1, 5 (paragraphs 0011 to 0022 of Patent Document 2, FIGS. 1, 2, etc.) ).

Utility Model Publication No. 63-240 Japanese Patent Application Publication No. 8-62089

In the configuration according to Patent Document 2, the first seal device 10 is freely guided in the axial direction by the support shaft 31, so when the speed of the extension movement of the hydraulic jack 41 is high, the first seal device 10 When the seal body 15 is strongly pinched between the two wheels 11 and 12 and expands in diameter while the first seal device 10 is moving in the axial direction, such as when the friction between the device 10 and the support shaft 31 is large. There is. Then, the expanded diameter seal body 15 slides on the inner circumferential surface 4 of the tube 1, and the seal body 15 on the first seal device 10 side is worn out compared to the seal body 25 on the second seal device 20 side. Watertightness may be impaired.

Furthermore, even if the diameters of the seal body 15 of the first seal device 10 and the seal body 25 of the second seal device 20 are expanded evenly, after each seal body 15, 25 contacts the inner surface of the tubes 1, 5, Since it is necessary to further press the seal bodies 15 and 25 against the inner surface of the seal bodies 15 and 25 in order to obtain a water-stop surface pressure, the seal body 15 of the first seal device 10, which has a longer sliding distance after contact, is better than the second seal. It tends to wear more easily than the seal body 25 of the device 20.

Therefore, an object of the present invention is to prevent wear of the elastic ring and ensure watertightness.

In order to solve the above problems, in this invention,
a main body extending along the tube axis;
a first water stop unit that is provided on the outer surface of the main body at one end in the tube axis direction and that can be brought into close contact with the inner surface of one of the connected tubes over the entire circumferential direction;
a second water stop unit that is provided on the outer surface of the other end of the main body in the tube axis direction and that can be brought into close contact with the inner surface of the other connected tube over the entire circumferential direction;
an extrusion device that generates an extrusion force along the tube axis direction;
The first water stop unit and the second water stop unit include a fixed flange fixed to the outer surface of the main body, and a fixed flange fixed to the outer surface of the main body, and a a sliding flange provided so as to be spaced apart from the fixed flange in the pipe axial direction; An elastic ring deforms outward as the pipe approaches the pipe and comes into contact with the inner surface of the pipe.

In this way, by making one of the pair of flanges in each water stop unit a fixed flange, even if the sliding flange is moved by the extrusion device, the elastic ring that spans the fixed flange and sliding flange will hardly move in the pipe axis direction. Don't move. Therefore, wear due to sliding between the elastic ring and the inner surface of the tube does not occur, and watertightness can be ensured.

In the above structure, the extrusion device may be provided between the first water stop unit and the second water stop unit. In this way, by providing an extrusion device between both water-stopping units and sharing the driving force of the sliding flanges of both water-stopping units with the extrusion device installed between both water-stopping units, both water-stopping units can be It is possible to equalize the pressure force acting on the inner surface of the tube from the elastic ring of the unit, ensuring higher watertightness.

In each of the above configurations, the extrusion device is a cylinder, and includes an inner cylinder integrated with the main body, an outer cylinder coaxially provided outside the inner cylinder, and an outer cylinder provided between the inner cylinder and the outer cylinder. An annular piston, which can be used as an annular piston. In this way, the pressure-receiving area of the piston of the cylinder can be increased, so even if the pressure of the working medium supplied to this cylinder is small, a large force can be applied to the sliding flange toward the fixed flange. .

In each of the above configurations, a biasing member may be provided between the fixed flange and the sliding flange to bias the flanges in a direction to separate them. In this way, after the hydraulic test, the fixed flange and the sliding flange can be quickly separated by the urging force of the urging member, and the diameter of the elastic ring can be reduced inward. Therefore, when moving the hydraulic test device to the next test position (joint), the elastic ring and the inner surface of the pipe do not slide, making it possible to move the hydraulic test device smoothly and preventing the elastic ring from sliding. It is possible to prevent the wear associated with

In each of the above configurations, the elastic ring has an overhanging portion that overhangs toward the inner wall of the tube beyond a pinching region sandwiched in the pipe axial direction by the fixed flange and the sliding flange, and an overhanging portion within the pinching region and the overhanging portion. and a recess formed on the tube axis side of the tube. By doing this, when the fixed flange and the sliding flange approach in the direction of the pipe axis, the elastic ring will easily protrude toward the inner wall of the pipe, so the tightness between the elastic ring and the inner wall of the pipe will be smoothed out. can be secured.

In this invention, by making one of the pair of flanges in each water stop unit a fixed flange, even if the sliding flange is moved by the extrusion device, the elastic ring spanning the fixed flange and the sliding flange will hardly move in the tube axis direction. Don't move. Therefore, wear due to sliding between the elastic ring and the inner surface of the tube does not occur, and watertightness can be ensured.

A sectional view showing a first embodiment (state before a water pressure test) of a water pressure test device for a pipe joint according to the present invention Diagram showing the positional relationship between the fixed flange and sliding flange in Figure 1 and the extrusion device A sectional view showing the state during a water pressure test using the water pressure test device shown in Figure 1. A sectional view showing a second embodiment (state before a water pressure test) of a water pressure test device for a pipe joint according to the present invention A diagram showing the positional relationship between the fixed flange and sliding flange in FIG. 4, and the extrusion device and biasing member. A sectional view showing the state during a water pressure test using the water pressure test device shown in Figure 4. A sectional view showing a third embodiment (state before a water pressure test) of a water pressure test device for a pipe joint according to the present invention A sectional view showing the state during a water pressure test using the water pressure test device shown in Figure 7. A sectional view showing a fourth embodiment (state before a water pressure test) of a water pressure test device for a pipe joint according to the present invention Cross-sectional view along line XX in Figure 9 10 is a sectional view showing a piston used in the hydraulic test device shown in FIG. 9, in which (a) is a first example, (b) is a second example, and (c) is a third example. A sectional view showing the state during a water pressure test using the water pressure test device shown in Figure 9.

A first embodiment of a water pressure testing device 1 for pipe joints (hereinafter abbreviated as water pressure testing device 1) according to the present invention is shown in FIGS. 1 and 2. This water pressure testing device 1 is a water-stop part of a pipe joint in which an insertion-side pipe body 2 in which an insertion port is formed and a receiving-side pipe body 3 in which a socket is formed are watertightly joined via a water-stop member 4. This is a device to check the soundness (watertightness) of the water.

This water pressure testing device 1 includes a main body 5 that extends along the tube axis direction, and is provided on the outer surface of one end of the main body 5 in the tube axis direction, and is installed on the inner surface of the connected insertion side tube body 2 (one tube). The first water stop unit 6 that can be in close contact with each other throughout the circumferential direction, and the inner surface of the receiving side pipe body 3 (the other pipe) that is provided on the outer surface of the main body part 5 on the other end side in the pipe axis direction and connected The main components are a second water stop unit 7 that can be brought into close contact with the tube over the entire circumferential direction, and an extrusion device 8 that generates an extrusion force along the tube axis direction.

The main body part 5 is a cylindrical member made of steel, and inner flanges 9 that stand up radially inward are formed at predetermined angular intervals in the circumferential direction on the inner surface of both ends in the tube axis direction. . Wheels 10 are provided at both ends of the main body 5 in the tube axis direction. The wheels 10 allow the hydraulic testing device 1 to be freely moved to any position along the tube axis direction.

The first water stop unit 6 and the second water stop unit 7 are slidable in the tube axis direction along the outer surface of the main body 5 by a fixed flange 11 fixed to the outer surface of the main body 5 and an extrusion force of the extrusion device 8. A sliding flange 12 is provided so as to straddle the fixed flange 11 and the sliding flange 12, and the fixed flange 11 and the sliding flange 12 are provided close to each other in the pipe axial direction. It has an elastic ring 13 that deforms outward as it moves and comes into contact with the inner surface of the insertion-side tube 2 or the receiving-side tube 3.

The fixed flange 11 is an annular plate-shaped member having a through hole with an inner diameter smaller than the inner diameter of the main body portion 5 and an outer diameter smaller than the inner diameters of the insertion side tube 2 and the receiving side tube 3. The outer circumferential edge is formed with an inclined surface whose thickness in the tube axis direction becomes smaller toward the outer circumference. The fixing flange 11 of the first water stop unit 6 is fixed to an inner flange 9 formed on one end side (the left side in FIG. 1) of the main body part 5 with bolts 14. Further, the fixing flange 11 of the second water stop unit 7 is fixed to an inner flange 9 formed on the other end side (the right side in FIG. 1) of the main body part 5 with bolts 14.

The sliding flange 12 is an annular plate-shaped member having an outer diameter smaller than the inner diameters of the insert-side tube 2 and the receiving-side tube 3, and in which a through hole with an inner diameter slightly larger than the outer diameter of the main body 5 is formed. It is. The outer circumferential edge is formed with an inclined surface whose thickness in the tube axis direction becomes smaller toward the outer circumference. The slope directions of the slopes formed on the pair of fixed flanges 11 and the sliding flange 12 are opposite to each other, and the slopes form a substantially V-shape. A water stop material 15 is provided between the sliding flange 12 and the outer surface of the main body portion 5.

The elastic ring 13 is located closer to the inner wall of the insertion-side tube 2 and the receiving-side tube 3 than the pinching area (the area indicated by arrow A in FIG. 1) sandwiched between the fixed flange 11 and the sliding flange 12 in the tube axis direction. It is a rubber ring having a substantially U-shaped cross section in the circumferential direction, and has an overhanging portion 16 that overhangs toward the direction, and a recess 17 formed within the sandwiching region and on the tube axis side of the overhanging portion 16.

In the reduced diameter state, this elastic ring 13 approaches the inner wall of each tube body 2, 3 at the center in the tube axis direction, and is slightly spaced apart from the inner wall of each tube body 2, 3 at both ends in the tube axis direction. It has a rounded shape in the tube axis direction. Further, one end of the elastic ring 13 in the tube axis direction is fixed to the fixed flange 11, and the other end is fixed to the sliding flange 12 by adhesive or other means.

The extrusion device 8 is a hydraulic cylinder provided between the first water stop unit 6 and the second water stop unit 7 on the outer surface side of the main body portion 5 . This extrusion device 8 has a cylindrical cylinder body 18 and two pistons 19 provided within the cylinder body 18. A rod 20 is connected to each piston 19, one rod 20 is connected to the sliding flange 12 of the first water stop unit 6, and the other rod 20 is connected to the sliding flange 12 of the second water stop unit 7. are connected to each.

A cylinder piping 21 is connected to the space between both pistons 19 in the cylinder body 18, and working water pressurized to a predetermined pressure is supplied through this cylinder piping 21. In this embodiment, one extrusion device 8 is provided above and one below the center of the tube axis, but the number and arrangement thereof can be changed as appropriate.

In this embodiment, a hydraulic cylinder is used as the extrusion device 8, but it is also possible to use other types of cylinders such as a hydraulic cylinder or a pneumatic cylinder, or a screw type drive device using an electric motor.

On the lower side between the first water stop unit 6 and the second water stop unit 7, there is a main body part 5, both water stop units 6, 7, and the connected insertion side pipe body 2 and receiving side pipe body 3. A water filling pressurizing pipe 22 that supplies pressurized water to the formed sealed space is provided, and an air venting pipe 23 that discharges air from the sealed space is provided on the upper side.

FIG. 3 shows a state during a water pressure test using the water pressure test apparatus 1 according to this embodiment. After moving the water pressure testing device 1 to the joint between the two tube bodies 2 and 3, working water is supplied from the cylinder piping 21 into the cylinder body 18 (between the two pistons 19). Then, both pistons 19 are moved in the tube axis direction so as to be separated by the hydraulic pressure of the working water.

As the piston 19 moves, each sliding flange 12 approaches its paired fixed flange 11 in the tube axis direction. Then, the elastic ring 13 provided so as to straddle the fixed flange 11 and the sliding flange 12 deforms so as to bulge outward in the radial direction and comes into contact with the inner surfaces of both the tubes 2 and 3. At this time, since the elastic ring 13 hardly moves in the tube axis direction, no wear occurs due to sliding between the elastic ring 13 and the inner surfaces of the tubes 2 and 3.

This elastic ring 13 is easily deformed by a small force when the fixed flange 11 and the sliding flange 12 approach in the tube axis direction due to the formation of the projecting portion 16 and the recessed portion 17. The diameter can be easily expanded toward the inner wall of 3. Therefore, a close contact between the elastic ring 13 and the inner walls of both the tube bodies 2 and 3 can be smoothly ensured. Further, the deformation of the elastic ring 13 is caused by the fixed flange 11 and the sliding flange 12 crushing the elastic ring 13 from both sides in the tube axis direction, and does not apply a force that stretches the elastic ring 13 outward in the radial direction. Therefore, deterioration of the elastic ring 13 due to repeated use is less likely to occur. In addition, by sharing the driving force of the sliding flanges 12 of both water stop units 6 and 7 with the extrusion device 8 provided between both water stop units 6 and 7, the elastic ring of both water stop units 6 and 7 It is possible to equalize the pressing force acting on the inner surfaces of both tube bodies 2 and 3 from 13, thereby ensuring higher watertightness.

When the elastic ring 13 of the first water stop unit 6 comes into contact with the inner surface of the insertion side tube 2 and the elastic ring 13 of the second water stop unit 7 comes into contact with the inner surface of the receiving side tube 3, the main body 5, A sealed space is formed by both water stop units 6, 7, and the connected insertion side pipe body 2 and receiving side pipe body 3. By supplying pressurized water to this closed space from the water filling pressurization piping 22 and removing the air accumulated in the upper part of the closed space from the air vent piping 23, this closed space is pressurized to a predetermined pressure (for example, 0.5 MPa). can be filled with pressurized water. After pressurizing to a predetermined pressure, it is maintained for a predetermined time (for example, 5 minutes), and watertightness is determined based on whether a predetermined test water pressure (for example, 0.4 MPa or more) can be maintained.

When the hydraulic test on the joint is completed, the supply of working water to the pressing device 8 (hydraulic cylinder) is cut off, the fixed flange 11 and the sliding flange 12 are separated, and the elastic ring 13 is reduced in diameter. , this elastic ring 13 and the inner surfaces of both tube bodies 2 and 3 are separated from each other. As a result, the pressurized water filled in the closed space is drained from the closed space. In this embodiment, the hydraulic cylinder used as the extrusion device 8 is a single-acting type that can pressurize from one side and apply pressure only in the direction of extruding the internal piston (not shown) in the discharge direction. However, by using a double-acting type with piping that pressurizes the internal piston in both the pushing direction and the returning direction, the sliding flange 12 can be forcibly returned to its original position, and the elastic ring 13 can be The diameter can be reduced more smoothly. Therefore, the hydraulic test device 1 can be quickly moved to the next test location (joint part), and the workability of the hydraulic test can be improved. Abrasion caused by sliding can be prevented.

Since this elastic ring 13 has one end in the tube axis direction fixed to the fixed flange 11 and the other end fixed to the sliding flange 12, the fixed flange 11 and the sliding flange 12 are fixed after the completion of the hydraulic test. By separating them, both ends of the elastic ring 13 are forcibly pulled in the tube axis direction, and the diameter of the elastic ring 13 can be reduced smoothly. In addition, since the elastic ring 13 has a rounded shape in the tube axis direction, when the hydraulic test device 1 is moved in the tube axis direction in the reduced diameter state, the elastic ring 13 It is possible to prevent a problem in which the end portion in the tube axis direction gets caught in the joint between the tube bodies 2 and 3.

A second embodiment of the hydraulic test device 1 according to the present invention is shown in FIGS. 4 and 5. This water pressure test device 1 has the same basic configuration as the water pressure test device 1 according to the first embodiment, but between the fixed flange 11 and the sliding flange 12 of the first water stop unit 6 and the second water stop unit 7. The difference is that a biasing member 24 is provided for biasing both flanges 11 and 12 in a direction to separate them. As this biasing member 24, an elastic body such as a spring can be used. In the following description of each embodiment, description of parts common to the hydraulic test apparatus 1 according to the first embodiment will be omitted.

FIG. 6 shows a state during a water pressure test using the water pressure test apparatus 1 according to this embodiment. Similarly to the above, in the hydraulic test using this hydraulic test device 1, when the test is completed, the supply of working water to the pressing device 8 (hydraulic cylinder) is cut off, and the fixed flange 11 and the sliding flange 12 are separated. By reducing the diameter of the elastic ring 13, the elastic ring 13 and the inner surfaces of the tubes 2 and 3 are separated from each other. In this embodiment, since the biasing member 24 is provided between the flanges 11 and 12, the biasing force thereof quickly separates the fixed flange 11 and the sliding flange 12, causing the elastic ring 13 to contract in diameter. Therefore, when moving the hydraulic test device 1 to the next test position (joint), the elastic ring 13 and the inner surfaces of both tubes 2 and 3 do not slide, making it difficult to move the hydraulic test device 1 smoothly. can. Therefore, the workability of this hydraulic test can be improved, and wear caused by sliding of the elastic ring 13 can be prevented.

In this embodiment, a single-acting extrusion device 8 is employed as in the first embodiment, but a double-acting extrusion device 8 may also be employed. In this way, even if the action of the biasing member 24 is insufficient, the sliding flange 12 can be reliably returned to its original position.

A third embodiment of the hydraulic test device 1 according to the present invention is shown in FIG. This water pressure test device 1 has the same basic configuration as the water pressure test device 1 according to the first embodiment, but has an extrusion device 8 (hydraulic cylinder) provided between the first water stop unit 6 and the second water stop unit 7. ) is different in that a link mechanism 25 rotatable around a rotation axis is provided at both ends.

FIG. 8 shows a state during a water pressure test using the water pressure test apparatus 1 according to this embodiment. In a hydraulic test using this hydraulic test device 1, a piston (not shown) is moved in the tube axis direction by the hydraulic pressure of working water supplied to the extrusion device 8, and each sliding flange 12 is fixed in pairs. approach the flange 11. According to this configuration, the link mechanism 25 can freely rotate around the rotation axis, so even if the insert-side tube 2 and the receiving-side tube 3 are bent relative to each other in the tube axis direction, the sliding The movable flange 12 can be smoothly moved along the tube axis direction of each tube body 2, 3. Further, since the extrusion device 8 does not need to be fixed to the main body 5, the structure can be simplified.

In this embodiment, a single-acting type extrusion device 8 is used as in each of the above embodiments, but a double-acting type extrusion device 8 can also be used. In this way, even if the action of the biasing member 24 is insufficient, the sliding flange 12 can be reliably returned to its original position.

A fourth embodiment of the hydraulic test device 1 according to the present invention is shown in FIG. This hydraulic testing device 1 has the same basic configuration as the hydraulic testing device 1 according to the first embodiment, but the configuration of the extrusion device 8 is different. That is, this extrusion device 8 includes an inner cylinder 26 that is integrated with the main body part 5, an outer cylinder 27 that is coaxially provided outside the inner cylinder 26, and two annular cylinders that are provided between the inner cylinder 26 and the outer cylinder. It has a piston 28. As shown in FIG. 10, struts 29 are provided between the inner cylinder 26 and the outer cylinder 27 at predetermined angular intervals in the circumferential direction (every 90 degrees in this figure) for connecting the two cylinders 26 and 27.

As shown in FIG. 11(a), the annular piston 28 is provided with rods 30 that protrude in the tube axis direction at predetermined angular intervals in the circumferential direction (every 90 degrees in this figure). Instead of this configuration, an annular member 33 may protrude from the annular piston 28 in the tube axis direction, as shown in FIG. 11(b), or act as the annular piston 28, as shown in FIG. 11(c). Alternatively, the annular member 33 may be configured to protrude in the tube axis direction from an elastic body such as rubber.

FIG. 12 shows a state during a water pressure test using the water pressure test apparatus 1 according to this embodiment. According to this configuration, the pressure-receiving area of the piston 28 can be increased compared to the hydraulic test device 1 according to the first embodiment to the third embodiment, so that the pressure of the working water supplied to the extrusion device 8 can be increased. Even if it is small, a large force can be applied to the sliding flange 12 toward the fixed flange 11.

In this embodiment, a single-acting type extrusion device 8 is used as in each of the above embodiments, but a double-acting type extrusion device 8 can also be used. In this way, even if the action of the biasing member 24 is insufficient, the sliding flange 12 can be reliably returned to its original position.

In each of the above embodiments, the extrusion device 8 is provided between the water stop units 6 and 7, and the sliding flanges 12 of the water stop units 6 and 7 are moved by the extrusion device 8, but for example, , each water stop unit 6, 7 is provided with an extrusion device 8, and each extrusion device 8 moves the sliding flange 12 of each water stop unit 6, 7 individually, or the extrusion device 8 is connected to both water stop units 6. , 7, and the sliding flanges 12 of both the water stop units 6, 7 can be moved via a link mechanism provided on the extrusion device 8.

Note that in the configurations according to the second to fourth embodiments, the biasing member 24 is interposed between the fixed flange 11 and the sliding flange 12, but similarly to the first embodiment, the biasing member 24 It is also possible to have a configuration that does not have.

The above-mentioned water pressure testing apparatus 1 is particularly suitable for water pressure testing of small diameter pipes, but can also be applied to water pressure testing of large diameter pipes without any problem.

The embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. Therefore, the scope of the present invention is indicated by the claims rather than the above description, and it is intended that equivalent meanings and all modifications to the claims are intended to be included.

1 Water pressure test device for pipe joints (water pressure test device)
2 tube (insertion side tube body)
3 Pipe (receiving side pipe body)
4 Water stop member 5 Main body part 6 First water stop unit 7 Second water stop unit 8 Extrusion device 9 Inner flange 10 Wheel 11 Fixed flange 12 Sliding flange 13 Elastic ring 14 Bolt 15 Water stop material 16 Overhanging part 17 Recessed part 18 Cylinder Main body 19 Piston 20 Rod 21 Cylinder piping 22 Water filling and pressure piping 23 Air vent piping 24 Urging member 25 Link mechanism 26 Inner cylinder 27 Outer cylinder 28 Piston 29 Support column 30 Rod 31 Cylinder water filling and pressure piping 32 Cylinder air vent piping 33 Annular member

Claims (5)

a main body portion (5) extending along the tube axis direction;
a first water stop unit (6) that is provided on the outer surface of the main body (5) at one end in the tube axis direction and that can be brought into close contact with the inner surface of one of the connected tubes (2) over the entire circumferential direction; ,
a second water stop unit (7) that is provided on the outer surface of the other end of the main body (5) in the tube axis direction and that can be brought into close contact with the inner surface of the other connected tube (3) over the entire circumferential direction; and,
an extrusion device (8) that generates an extrusion force along the tube axis direction;
The first water stop unit (6) and the second water stop unit (7) have a fixing flange (11) fixed to the outer surface of the main body (5), and the extrusion device (8). a sliding flange (12) provided spaced apart from the fixed flange (11) in the tube axial direction along the outer surface of the main body portion (5) by an extrusion force; and the fixed flange (11) and the sliding flange (12), and deforms outward as the fixed flange (11) and the sliding flange (12) approach in the tube axis direction. A hydraulic test device for a pipe joint, comprising an elastic ring (13) that abuts the inner surface of the pipe (2, 3). The hydraulic pressure test device for a pipe joint according to claim 1, wherein the extrusion device (8) is provided between the first water stop unit (6) and the second water stop unit (7). The extrusion device (8) is a cylinder, and includes an inner cylinder (26) integrated with the main body (5), an outer cylinder (27) coaxially provided outside the inner cylinder (26), and an inner cylinder (27) that is coaxially provided outside the inner cylinder (26). The hydraulic testing device for a pipe joint according to claim 1 or 2, further comprising an annular piston (28) provided between the cylinder (26) and the outer cylinder (27). Any one of claims 1 to 3, further comprising a biasing member (24) between the fixed flange (11) and the sliding flange (12) that biases both the flanges (11, 12) in a direction to separate them. Hydraulic pressure testing equipment for pipe fittings as described in Section. The elastic ring (13) has an overhanging portion () that overhangs toward the inner wall of the tube (2, 3) beyond a sandwiching region that is sandwiched in the tube axis direction by the fixed flange (11) and the sliding flange (12). 16); and a recess (17) formed within the sandwiching region and on the tube axis side of the overhang (16). Device.

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