JP4978905B2 - Pressure test equipment for pipe joints - Google Patents

Description

  In the present invention, a rubber sleeve that is attached to the inner wall of a pipe joint portion to form a ring-shaped airtight space is expanded by a jack with two flexible band-shaped members having a rigid portion and pressed against the inner wall. The present invention relates to a pressure test apparatus for obtaining airtightness.

  In pipe construction, a water pressure test is performed manually on pipe joints with a diameter of 800 mm or more. The water pressure test method is to attach a rubber sleeve to the inner wall of the pipe joint and jack the metal frame inside it. An airtight space is formed by expanding the diameter and pressing the rubber sleeve, and it is used to determine the presence or absence of water leakage by injecting a pressurized test fluid into this airtight space. Usually, 0.5 MPa is used as the upper limit of the pressure resistance test. Yes.

  Japanese Utility Model Publication No. 62-14354 is shown in FIGS. 6, 7, and 8 as an example of a pressure test apparatus for such a pipe joint. The pressure test apparatus shown in FIG. 6 includes a ring-shaped sealing material 40 that keeps hermeticity inside the pipe joint portion P1, and an annular metal pad 41 arranged along the inner peripheral surface of the sealing material 40. In addition, the annular metal frame 42 arranged along the inner peripheral surface has two strips, and is a pressure test apparatus that pressurizes the pipe joint portion P1 using the water injection port 48 and the air vent port 49. In the state of the pressure test apparatus shown in FIG. 7, the divided metal frame 42 is connected by a frame mounting bracket 43 and a bolt 44, and the divided portion 47 of the metal frame 42 is jacked to press the sealing material 40 against the inner wall P4. The jack 17 attached to the mounting bracket 45 expands the diameter, the adjustment bracket 46 is fixed to the split portion 47 of the metal frame 42 with a bolt 44, and an airtight space is formed inside the pipe joint portion P <b> 1 by the sealing material 40. The state of the pressure test apparatus shown in FIG. 8 is a state in which the jack 17 and the jack fitting 45 are removed from the state of the pressure test apparatus shown in FIG. The state of pressurization is shown.

  The adjacent pipes P2 and P3 of the pipe joint portion P1 have different inner diameters based on pipe manufacturing tolerances, different inner diameters depending on the pipe type, unevenness of the joints at the time of construction, bending, factors such as flattening of the pipe due to earth pressure, etc. Since the metal frame 42 is not inscribed in the same rotating surface, the metal frame 42 is a two-row separation type having a flexibility to press each of the end portions of the adjacent pipes P2 and P3, but all along the inner peripheral surface of the sealing material 40. There are cases in which the annular metal backing plate 41 covering the entire circumference and width becomes an obstacle, and the effect of making the metal frame 42 into the double strip type cannot be exhibited, and the sealing material 40 cannot be pressed evenly. Further, when the metal backing plate 41 is not attached and the gap 23 of the metal frame 42 is wide, there arises a problem that the sealing material 40 bulges due to the test pressure.

  The divided portion 47 of the metal frame 42 is expanded in diameter by the jack 17, and the adjustment metal fitting 46 is fixed and connected by the bolt 44 to maintain the expanded diameter state, the jack 17 and the jack mounting bracket 45 are removed, and a pressure resistance test is performed. However, since the adjusting frame 46 is fixed and connected with the bolt 44 in a state where the metal frame 42 of the mounting portion of the jack 17 is bent inward by the tension force of the diameter expansion action of the jack 17, the mounting portion of the jack 17 is connected. Therefore, in order to restore the bending of the metal frame 42 and obtain an even pressure, the jack 17 must be removed and a pressure resistance test must be performed.

  The inside of the pipe where the pressure test is performed is dark and narrow, and the working environment is bad. In particular, the work of attaching or removing the adjustment fitting 46 in the narrow space between the jack 17 and the metal frame 42 with the bolt 44, and the metal frame 42 are attached to the frame attachment fitting 43. The work of connecting with the bolt 44 or the work of removing it is an inefficient work.

  Since the maximum manufacturing tolerance of the inner diameter of the concrete pipe is ± 10 mm, the metal fitting 42 cannot be held in an appropriate diameter-expanded state unless the diameter-adjusting adjustment fitting 46 is stepless, and depending on the type of pipe, Since the inner diameters are different, the pressure test equipment is actually manufactured according to the type of tube. Since the flexible tube is flattened by earth pressure, if the diameter of the flexible tube 17 is repeatedly increased and the metal frame 42 is bent to conform to the flat state of the tube, high airtightness cannot be secured. There is a need for a versatile pressure test apparatus.

Japanese Utility Model Sho 62-14354 No. 58-663340 No. 40-01918

  The present invention has been made paying attention to the above-mentioned points, and the problem is that the adjacent pipes of the pipe joint part are different in inner diameter based on the pipe manufacturing tolerance, different in inner diameter depending on the pipe type, and different in the joint at the time of construction. A pressure-resistant testing device that can be accommodated by separating the flexible band-shaped member into two strips because it is not inscribed in the same rotating surface due to factors such as flattening of the pipe due to bending, earth pressure, etc., is known. The problem of separating the flexible band-shaped member into two strips without using an annular metal backing plate that prevents the rubber sleeve from expanding due to the test pressure from the gap between the two strips of the flexible band-shaped member; In order to improve the workability of the pressure test, which is a dark and narrow pipe work, the problem of enabling the pressure test to be performed with the split part of the flexible band-shaped member expanded with a jack and the pipe inner diameter are subject to manufacturing tolerances. There are differences within the scope To provide a pressure test device that solves the problems of expanding the adjustment range of diameter expansion, such as the fact that the inner diameter of the tube varies depending on the type of tube, and enabling stepless adjustment, and expanding the application range of the pressure test device. That is.

In order to solve the above problems, the present invention provides a rubber sleeve that is attached to the inner wall of the pipe joint portion to form a ring-shaped airtight space, a pressure inlet that injects a pressurized test fluid into the airtight space, Two flexible band-shaped members arranged in the longitudinal direction of the tube on the inner peripheral side of the rubber sleeve, a plurality of tie lots holding gaps between the two flexible band-shaped members, and the flexible band-shaped member A pressure-resistant test apparatus having a jack attached to both ends of the member for expanding the diameter of the flexible band-shaped member in the circumferential direction of the pipe and pressing the rubber sleeve, the circumferential direction of the flexible band-shaped member A divided part that is divided into a plurality of parts, an assembly-type hinge that connects these adjacent divided parts, a tapered part at the outer end where the both ends of the flexible band-shaped member are overlapped, and the flexible band Section A rigid portion formed at an attachment portion to which the jack is attached, a jack cradle fixed to an inner end portion of the overlapping portion of the flexible band-shaped member, and a jack fixed to an end portion of the rigid portion A pressure test apparatus for a pipe joint portion having a cradle and a trapezoidal sleeper along an arc of a flexible band-shaped member mounted between the jack cradle, wherein the jack of the flexible band-shaped member The rigid part formed in the mounting part is a rigid part that prevents bending due to the stretching force of the diameter expansion action, and by forming the rigid part, airtightness is ensured in a state where the diameter of the flexible band member is expanded with a jack It is a measure to do.

  A flexible band-shaped member is used as means for pressing the rubber sleeve against the inner wall of the tube and ensuring airtightness. The flexible band-shaped member is a double-strand type that presses against the end of each adjacent tube, and the tie-lot that appropriately holds the gap between the two strips of the flexible band-shaped member in accordance with the thickness of the rubber sleeve and the pressure test pressure. By attaching a plurality of parts, it is possible to keep the expansion of the rubber sleeve within a safe range even without a metal backing plate, and the characteristics of the two flexible band-shaped members are exhibited.

  The flexible band-shaped member of the jack mounting part that presses the rubber sleeve is bent inward by the tension force of the jack's diameter expansion action, and the pressure of the rubber sleeve is reduced. Detachment restores the deflection to obtain uniform pressure, but a rigid part is formed by attaching a reinforcing rib to the flexible band-shaped member of the jack mounting part, and the deflection due to the stretching force of the jack's diameter expansion action It is possible to ensure uniform airtightness over the entire inner wall of the pipe joint in a state where the diameter is increased by the jack.

  The bendable band-shaped member must be flexible along the inner wall of the tube and have a cross-sectional force that does not buckle due to an axial force due to diameter expansion. For this purpose, individual flexible band-like members are formed using a tough material such as a stainless steel plate, and further, the individual flexible band-like members are divided into a plurality of parts and connected by an assembly hinge. Both ends are overlapped when stretched, and the outer overlapping part that contacts the rubber sleeve is tapered to ensure a stepless diameter expansion state, and the end of the flexible band-shaped member is fixed with an adjusting bracket. There is no need to concatenate.

  When the flexible band-like member is made to follow the flattening of the tube, the rigid part of the flexible band-like member is attached to a part close to a perfect circle and fixed to the inner end of the overlapping part of the flexible band-like member. By inserting a plurality of trapezoidal sleepers along the arc of the flexible band-shaped member to be mounted between the jack cradle, the jack cradle fixed to the end of the rigid portion, and the jack cradle. It is possible to make the flexible band-like member follow the flattening of the pipe by supplementing the extension stroke and sequentially expanding the diameter with a jack. By appropriately selecting the overlapping allowance of the members, it is possible to expand the applicable pipe diameter range of the pressure test apparatus.

  Since the present invention is configured and operates as described above, the adjacent pipes in the pipe joint portion have different inner diameters based on pipe manufacturing tolerances, different inner diameters depending on pipe types, joint differences and bending during construction, By connecting two or more flexible band-shaped members that can be accommodated with a plurality of tie-lots held at appropriate intervals even in situations where they are not inscribed in the same rotational surface due to factors such as flattening of the tube due to pressure, etc. It is possible to keep the bulge of the rubber sleeve within a safe range, and a rigid part is formed by attaching a reinforcing rib to the flexible band-shaped member of the jack mounting part, and bending due to the tension force of the jack's diameter expansion action It is possible to ensure uniform airtightness over the entire inner wall of the pipe joint when the diameter is expanded with a jack, and each flexible band-like member is divided into multiple parts and assembled. Connected with a hinge, the ends of the flexible band-like member are overlapped when stretched, and the outer overlapping part that contacts the rubber sleeve is tapered to ensure a stepless diameter expansion state. By inserting multiple trapezoidal sleepers along the arc of the flexible band-shaped member to be installed between the jacks, the extension stroke of the jack is compensated, and by appropriately selecting the overlapping margin of the flexible band-shaped member, There is an effect that the working efficiency as the pressure test device is remarkably improved, such as expanding the applicable tube diameter range of the test device.

  Hereinafter, the pressure resistance test apparatus 10 of the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 is a longitudinal sectional view of a pressure test apparatus 10 in a pipe joint portion P1 according to the present invention. A rubber sleeve 11 is attached to inner walls P4 of adjacent pipes P2, P3 of a pipe joint portion P1, and a flexible band-like member 12 is attached. Are connected by tie lots 13, the gap 23 is regulated, the jack 17 and the trapezoidal sleeper 18 are mounted between the jack cradle 16A and the jack cradle 16B, and the diameter of the jack 17 is increased to compensate for the expansion stroke. An airtight space is formed, and a pressurized fluid is injected from the pressure inlet 14 to test the airtightness. The outer reinforcing rib 21 and the inner reinforcing rib 22 are provided on the flexible band-shaped member 12 of the mounting portion of the jack 17. To form the rigid portion 19 prevents the jack 17 from being bent due to the stretching force of the diameter-expanding action, and the jack 17 expands the diameter of the inner wall P4 of the pipe joint portion P1. Shows the pressure test device 10 capable of ensuring a airtight.

  The adjacent pipes P2 and P3 of the pipe joint part P1 subject to the pressure test are flattened due to differences in inner diameter based on pipe manufacturing tolerances, differences in inner diameter depending on the pipe type, joint differences or bending during construction, earth pressure, etc. It is normal not to be inscribed in the same rotating surface due to factors such as conversion. Therefore, the flexible band-shaped member 12 that expands the diameter of the rubber sleeve 11 that retains hermeticity and presses it against the inner wall P4 cannot be concentric with each of the adjacent pipes P2 and P3 unless it is a two-line separation type. It is. When the flexible band-shaped member 12 is a two-strip separation type, the rubber sleeve 11 swells from the gap 23 of the flexible band-shaped member 12, but the thickness of the rubber sleeve 11 is 10 mm and the pressure resistance test pressure is about 0.5 MPa. Then, by connecting with the tie lot 13 and restricting the gap 23 to 20 mm or less, the swelling of the rubber sleeve 11 can be kept within a safe range without using the metal backing plate 41 or the like, and the two lines of flexure The characteristic of the conductive band-like member 12 is exhibited.

  The pressure test state of the present invention is shown in FIG. 2, the rubber sleeve 11 is attached to the pipe joint portion P <b> 1, and both ends of the flexible band-like member 12 connected by the assembly type hinge 15 are overlapped. A jack 17 is mounted between the jack cradle 16A fixed to the end of the jack and the jack cradle 16B fixed to the end of the rigid portion 19 of the flexible band-shaped member 12, and according to the diameter expansion amount. The state in which the pressure-resistant test is carried out in a state where the trapezoidal sleepers 18 are sequentially inserted, the rubber sleeve 11 is pressed against the inner wall P4 of the pipe, and the jack 17 is attached is shown.

  FIG. 5 shows a cross-sectional view of the rigid portion 19 and the rubber sleeve 11 of the flexible band-shaped member 12 according to the present invention. The flexible band-shaped member 12 of the mounting portion of the jack 17 that presses the rubber sleeve 11 is Since the elastic rubber sleeve 11 is pressed inward by the stretching force of the diameter expanding action, the outer reinforcing rib 21 and the inner reinforcing rib 22 are welded to the flexible band-shaped member 12 of the mounting portion of the jack 17 to form the rigid portion 19. By preventing the bending due to the stretching force of the diameter expansion action of the jack 17 and making the outer overlapping portion of the flexible band-shaped member 12 into the tapered shape 20, the stepless diameter expansion adjustment can be performed smoothly. It is possible to ensure uniform airtightness over the entire inner wall P4 of the pipe joint portion P1 in a state where the diameter is expanded by the jack 17.

  The both ends of the flexible band-shaped member 12 are overlapped when the diameter is expanded, and the outwardly overlapped flexible band-shaped member 12 that contacts the rubber sleeve 11 has a tapered shape 20 with a gradient of about 5%. The flexible band-shaped member 12 can be easily overlapped, a stepless diameter expansion state is ensured, and the flexible band-shaped member 12 is overlapped with respect to the difference in inner diameter based on the pipe manufacturing tolerance and the difference in inner diameter depending on the tube type. By securing the margin, the effect of expanding the applicable pipe diameter range of the pressure test apparatus 10 is also exhibited.

  The jack cradle 16A, 16B fixed to the flexible band-shaped member 12 generates a bending moment in the flexible band-shaped member 12 due to the tensile force of the expansion of the jack, but the jack is in the direction in which the jack 17 is stretched. By using the jack cradle 16A, 16B with increased rigidity in the contact range between the center line direction of 17 and the flexible band-shaped member 12, the band 17 The function of converting the component force into the tangential direction of 12 and acting as an axial force is achieved, and the center line direction of the jack 17 is matched with the pin 25A joined to the jack cradle 16A and the pin 25B joined to the trapezoidal sleeper 18. Thus, it is possible to prevent an uneven load from acting on the jack 17.

  The operation state for the flexible tube is shown in FIG. 3, and the rubber sleeve 11 follows the bending of the tube. However, when the flexible band-shaped member 12 matches the short diameter of the flexible tube, it matches the bending portion 30 in the major axis direction. Since the flexible band-shaped member 12 is bent, the amount of diameter expansion by the jack 17 increases, and the extension stroke of the jack 17 may be insufficient. The shortage of the extension stroke of the jack 17 is compensated by mounting a plurality of trapezoidal sleepers 18. The trapezoidal sleeper 18 along the arc of the flexible band-shaped member 12 is placed on the jack cradle 16B of the two flexible band-shaped members 12 as shown in FIG. It becomes possible to keep.

  FIG. 4 shows a state in which the flexible band-shaped member 12 is divided into a size that can be loaded from a 600 mm manhole hole, connected by an assembly hinge 15 and a tie lot 13, and the integrated flexible band-shaped member 12 is folded. When the tube is moved in a folded state and extended, the diameter can be increased by the jack 17 and the workability is very good.

  The pressurized fluid used in the test for pressurizing the airtight space of the pipe joint portion P1 by the pressure test apparatus 10 of the present invention and determining the presence or absence of water leakage may be water pressure, air pressure, or other fluid pressure. Air pressure is recommended for the highest work efficiency. There are two methods for securing compressed air: a method in which compressed air from the ground is drawn into the pipe with a hose, and a method in which a battery and a small compressor are carried into the pipe. The latter is recommended because it is much more efficient and economical.

  The pressure test apparatus 10 is a pressure test apparatus 10 that has overcome the problems of the prior art and has greatly improved work efficiency as a pressure test at the pipe joint P1, and is used for a leak test and other pressure tests other than the pipe joint P1. There is a possibility.

The longitudinal cross-sectional view of the pressure | voltage resistant test apparatus in the pipe joint part which concerns on this invention. The cross-sectional view which shows the pressure | voltage resistant test state which concerns on this invention. The cross-sectional view which shows the diameter expansion state corresponding to the bending of the pipe | tube which concerns on this invention. The cross-sectional view which shows the folded state of the flexible band-shaped member which concerns on this invention. Sectional drawing of the rigid part of the flexible band-shaped member which concerns on this invention, and a rubber sleeve. The longitudinal cross-sectional view which shows the conventional pressure | voltage resistant test apparatus. The cross-sectional view which shows the diameter expansion state of the conventional pressure | voltage resistant test apparatus. The cross-sectional view which shows the pressure test state of the conventional pressure test apparatus.

Explanation of symbols

P1 Pipe joint part P2 Adjacent pipe P3 Adjacent pipe P4 Inner wall 10 Pressure resistance test device 11 Rubber sleeve 12 Flexible band-like member 13 Tylot 14 Pressure inlet 15 Assembled hinge 16A Jack fixed to end of flexible band-like member 12 Receiving base 16B Jack receiving base fixed to end of rigid portion 19 Jack 18 Trapezoidal sleeper 19 Rigid portion 20 Tapered shape 21 Outer reinforcing rib 22 Inner reinforcing rib 23 Gap 25A Pin 25B trapezoid joined to jack receiving base 16A Pin 30 joined to sleeper 18 of flexure
40 Sealing material 41 Metal pad 42 Metal frame 43 Frame mounting bracket 44 Bolt 45 Jack mounting bracket 46 Adjustment bracket 47 Dividing part 48 Water inlet 49 Air vent

Claims (1)

A rubber sleeve mounted on the inner wall of the pipe joint portion to form a ring-shaped airtight space, a pressure inlet for injecting a pressurized test fluid into the airtight space, and the length of the tube on the inner peripheral side of the rubber sleeve Two flexible band-shaped members arranged in a direction, a plurality of tie rods holding gaps between the two flexible band-shaped members, and a flexible band-shaped member attached to both ends of the flexible band-shaped member And a jack for expanding the member in the circumferential direction of the tube and pressing the rubber sleeve, and a splitting portion for dividing the flexible band-shaped member into a plurality of portions in the circumferential direction. An assembly-type hinge that connects adjacent divided parts, a tapered part at the outer end where the both ends of the flexible band-shaped member are overlapped, and the jack of the flexible band-shaped member are attached. A rigid portion formed in the attaching portion, a jack cradle fixed to an inner end of the overlapping portion of the flexible band-shaped member, a jack cradle fixed to an end of the rigid portion, and the jack And a trapezoidal sleeper along a circular arc of a flexible band-shaped member to be mounted between the cradle, and a pressure test apparatus for a pipe joint portion formed on the jack mounting portion of the flexible band-shaped member. The rigid portion is a rigid portion that prevents bending due to the stretching force of the diameter expansion action, and is characterized by ensuring airtightness in a state where the flexible band-shaped member is expanded in diameter by a jack by forming the rigid portion. Pressure test equipment at pipe joints.

Images