JP2008045943A - Pressure testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the reliability of piping capable of confirming the pressurized water resistance for any type of pipe line making, capable of performing hydraulic pressure test at the connecting part of piping which is demanded of sealing performance. <P>SOLUTION: The pressing part 3 of the hydraulic pressure testing device 1 comprises a pressing plate 31 pressed to a connection part 51, while internally mounting the packing material 33 on the facing surface to the internal periphery surface of the connection part 51 separated into a plurality of separated around the internal surface of the connection parts 51; and an activating shafts 32 for pressing the pressing plate 31 in the radially outword direction. The pressing plate 31 and the packing material 33 are formed in a recessed groove state, the packing material 33 is provided with a means 41 for making the insertion part 54 follow the shape of the packing material 33 with respect to the receiving part 53 of the connecting part 51. Thereby, the pressing plate 31 is arranged over both the tips of the insertion part 54 and the receiving part 53 of the connection part 51, while the water-sealed testing space 11 is formed between the connecting part 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water pressure test apparatus at a joint portion of a pipeline.

  In a pipe line with a joint structure with multiple large-diameter pipes buried in the ground, straight pipes are formed by connecting straight pipes together, and bent pipes according to the bending angle are used for the bent parts. It is common. However, in such a pipe line, when the pipe is bent along a gentle curve with a small bending angle or depending on the action of earth pressure or the like in the embedding process, an angle is generated in the joint part between the straight pipes, and the It may become piping along the curve.

  In such a case, in the joint portion of the straight pipe, the opposing surfaces of the receiving port and the insertion port through the packing are not parallel to each other, and it is difficult to apply an equal water stop pressure to the packing with an angle. Therefore, it is necessary to confirm whether or not the joint portion satisfies the required water stoppage. Therefore, there has been a demand for an apparatus suitable for performing a water pressure test on a joint portion in a pipe line having a joint structure.

  Conventionally, as described in Patent Document 1, the hydraulic pressure test of the joint portion is performed by fitting an annular seal band across the inner peripheral surface of the end of the insertion port and the inner peripheral surface of the receiving port, and the seal band. Is pressed from the inside, thereby forming a sealed space inside the packing material of the joint portion, and injecting test water into the sealed space. In addition, such a water pressure test is performed by joining a joint part after a pipe joining operation, a person enters the pipe with a water pressure test device at each joint position, and the band is pushed and expanded on the inner surface of the pipe. Work to confirm whether there is a water leak due to a malfunction of

  Patent Document 2 describes a water pressure tester that inspects the watertight performance of a pipe joint before filling it back into the ground. This type of tester is designed to test by applying water pressure in a cylindrical tube, expanding a part thereof, and applying water pressure with the joint portion as a sealed space. That is, the joint portion is positioned between the expanded tubes, and the water pressure test can be performed by pouring water from the water injection hose into the expansion portion pipe.

Further, Patent Document 3 proposes a water-stop joint for sealingly connecting a pipe end of a drawn steel pipe drawn into the existing buried pipe and the existing buried pipe for the old pipe rehabilitation work. This water-stopping joint has a ring-shaped packing press fitting attached to the tip of a drawn steel pipe drawn into an existing buried pipe, a short pipe is connected to the opposite side, and the outer side of the short pipe is tightened to face the packing press fitting A push ring is fitted and arranged. Then, the first and second ring-shaped rubber packings are arranged opposite to each other between the fastening press ring and the packing pressing metal fitting, and between the first and second ring-shaped rubber packings and between the existing buried pipe and the short pipe. The spacer which forms a clearance gap between them is arrange | positioned, and it is comprised so that the water pressure test of a water stop part can be performed from the water injection hole of a short pipe.
Japanese Utility Model Publication No. 60-15155 JP 2003-294571 A JP 2002-213646 A

  Each of the various water pressure test devices as described above is used for joints between straight pipes in a pipeline, and it is assumed that the pipe inner surface on the receiving side and the insertion side are flush with each other. It is. Therefore, it cannot be said that it is sufficient to confirm the water-stopping property for a joint portion that forms a gently bent portion with a small bending angle as described above, and a test apparatus that can cope with various bending angles is necessary. It was.

  Accordingly, the present invention has been made in view of such problems, and it is possible to perform a water pressure test on a joint portion of a pipe for which water blocking is required for any pipe line. The present invention provides a water pressure test apparatus that can confirm the water pressure resistance of a water portion and can improve the reliability of piping.

  In order to achieve the above-described object, the water pressure test apparatus according to the present invention includes a test space support means arranged in an annular shape facing a pipe inner peripheral surface at a joint part between pipes sealed by a seal part, and this test. And a pressing portion that is connected to the space support means and covers the both ends of the insertion portion side and the receiving portion on the inner peripheral surface of the joint portion to form a test space. A presser plate that is formed with a curved surface that is divided into a plurality of circumferential directions along the surface and that is packed with a packing material on a surface facing the inner peripheral surface of the joint, and pressed against the joint, and each of these pressers It has a working shaft that supports and presses the plate radially outward, and the pressing plate and the packing material are formed in a substantially concave groove shape in cross section. Follow the bending angle of the insertion hole Subordinate means are provided, and the pressing space is supported by the test space support means so as to be along the inner peripheral surface of the joint portion, and the pressing force is applied to the operating shaft of the pressing portion and is connected to each operating shaft. The holding plate is placed across both the insertion port side and the receiving side tip of the inner peripheral surface of the joint part, and the packing material forms a test space by watertight sealing between the joint part by the follow-up means. It is characterized in that the water pressure test of the joint portion is made possible by pouring test water into the space.

  As follow-up means in the hydraulic test apparatus having the above-described configuration, inside the packing material, deformed hollow portions capable of supplying a fluid are formed on both side walls of the groove shape of the packing material, and these deformed hollow portions are A fluid supply line that can supply fluid from the outside of the packing material is connected, and by supplying fluid to each deformed hollow portion, the deformed hollow portion is expanded to change the shape of the side wall portion of the packing material, and the packing material The contact angle to the insertion slot is freely changeable.

  Further, as the follow-up means, a plurality of protrusions or a plurality of protrusions may be formed on the abutting surface where the packing material abuts on the inner peripheral surface of the joint port and the insertion port.

  Further, as the follow-up means, the contact surface on which the packing material contacts the inner peripheral surface of the joint port and the insertion port may be formed as an inclined surface having a predetermined inclination angle in the tube axis direction, In this case, the inclined surface of the packing material is preferably formed as an inclined surface whose outer side is higher than the inner side of the side wall portion.

  Further, as a follow-up means, a material having a lower hardness than the portion of the packing material excluding the vicinity of the abutting surface where the packing material abuts the inner periphery of the joint port and the insertion port. It is preferable that it is formed by.

  With such a characteristic configuration, it is easy to cause the holding plate of the pressing portion to follow the bending angle of the insertion port with respect to the receiving port of the joint portion, and both the front end portion on the insertion port side and the receiving side of the joint portion. It is possible to perform a reliable water pressure test by forming a test space that is also sealed in a watertight manner. Therefore, after filling the test space with water with a predetermined water pressure, it can be determined whether there is any water leakage from the seal part by checking whether there is any water leakage from the seal part, and the bending angle can be determined. Even if it has a pipeline, it is possible to check its reliability and put it in service.

  According to the water pressure test apparatus of the present invention configured as described above, it is possible to perform a water pressure test on a joint portion of a pipe for which water stoppage is required for any pipe line, The water pressure resistance of the pipe can be confirmed, and the reliability of the piping can be improved.

  Hereinafter, the best mode for carrying out a water pressure test apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view showing an example of a water pressure test apparatus according to the present invention, partially broken in the pipe axis direction of a pipe line, and FIG. 2 is a partial cross-sectional view showing an example of a pipe line for testing by the water pressure test apparatus. is there.

  The water pressure test apparatus 1 is a straight pipe in a pipe line buried in the soil, having a small bending angle and piped through a joint along a gentle curved line, or by an action such as earth pressure in the embedding process. When piping is formed along a gentle curve line with a slight angle formed between the joints, a water pressure test is performed on the joints of such pipes to confirm the water pressure resistance and water stoppage of the joints. It is possible to put it in service.

  The water pressure test apparatus 1 forms a test space 11 for performing a water pressure test in the joint portion 51 of the pipe line 5 on the inner peripheral surface of the joint portion 51. The water pressure test apparatus 1 of the present invention is provided with a test space support means 2 and a pressing portion 3. As shown in the figure, the water pressure test apparatus 1 is disposed in a joint portion 51 of the pipe 5, and the test space support means 2 supports the pressing portion 3 in the circumferential direction along the inner peripheral surface of the joint portion 51. .

  The joint portion 51 between the tubes is sealed inside and outside by a seal portion 52. The test space support means 2 includes an annular support member 21 arranged in an annular shape so as to face the inner peripheral surface of the joint portion 51 over the entire circumference, and the inner peripheral surface (bottom portion) of the joint portion 51. And a fixing portion 22 to be fixed to.

  The pressing portion 3 is connected to the annular support member 21 of the test space support means 2 and covers the distal end portions on the insertion port 54 side and the receiving port 53 side of the inner peripheral surface of the joint portion 51. Thus, a test space 11 is formed.

  The pressing portion 3 is formed by dividing the pressing plate 31 in the circumferential direction so as to be along the inner peripheral surface of the joint portion 51, and each is along the inner peripheral surface in the circumferential direction of the joint portion 51. It is formed with an appropriate curvature. And the pressing part 3 is provided with action shafts 32, such as a clamping bolt, which supports and presses these each pressing board 31 to radial direction outward. The pressing plate 31 of the pressing portion 3 includes a packing material 33 provided on the surface facing the inner peripheral surface of the joint portion. When the action shaft 32 is tightened, the pressing portion 31 is pressed against the joint portion 51 and the test space 11. The water-tight seal is possible.

  When the pipe line 5 embedded as described above has a crossing angle between the pipe shafts in the joint portion 51 when the peripheral surfaces of the receiving port 53 and the insertion port 54 are not parallel to each other, On the other hand, the insertion port 54 has a bending angle and has a positional relationship as shown in FIG. The bending angle of the insertion port 54 with respect to the receiving port 53 is, for example, about 1 to 2 degrees when the nominal diameter is 1000 mm or more.

  For such a pipe line 5, in the present invention, the packing material 33 of the pressing portion 3 is provided with a follower that can follow the bending angle of the insertion port 54 with respect to the receiving port 53 of the joint portion 51. Yes. By the following means of the packing material 33, it is possible to form a test space that is firmly fixed to the joint portion 51 having such a bending angle.

  FIG. 3 is an explanatory view showing the pressing portion in the water pressure test apparatus of the present invention by a partial cross section in the tube axis direction, and FIG. 4 shows another configuration of the pressing portion of the water pressure test apparatus in a partial cross section in the tube axis direction. It is explanatory drawing. In FIGS. 3 and 4, in order to make the drawings easier to see, hatching indicating a cross section is omitted in the constituent members such as the pipe and the pressing portion.

  In the illustrated embodiment, the pressing plate 31 of the pressing unit 3 of the hydraulic pressure test apparatus 1 and the packing material 33 provided in the pressing plate 31 are formed in a substantially concave groove shape along the tube axis direction. The holding plate 31 is formed in a substantially concave groove shape and is configured to cover the both ends of the insertion port 54 and the receiving port 53, and the inner surface side thereof is covered with the packing material 33 so that the receiving port 53 and the insertion port are covered. The packing material 33 is interposed between the packing material 33 and 54.

  The both side walls 331 and 331 having the groove shape of the packing material 33 are in contact with the inner peripheral surfaces of the receiving port 53 and the insertion port 54 of the joint portion 51 at the edge, and also cover the edge of the holding plate 31. So as to extend outward. The packing material 33 is provided with follow-up means for causing the shape of the packing material 33 to follow the bending angle of the insertion port 54 with respect to the receiving port 53 of the joint portion 51.

  As a follow-up means, a deformed hollow portion 41 is formed inside the packing material 33. As shown in the figure, the deformed hollow portions 41 are formed on the both side walls 331 and 331 of the groove shape of the packing material 33, respectively. Each deformed hollow portion 41 is formed in an approximately elliptical cross section or a similar shape to the inside from the upper portion of the side wall portion 331 to the extending portion.

  A fluid supply line 42 that can supply fluid from the outside of the packing material 33 is connected to each of the deformed hollow portions 41 so that the fluid can be supplied to the inside of the deformed hollow portion 41. The fluid supplied to the fluid supply line 42 may be either gas or liquid, and examples thereof include air and water. Further, the fluid supply line 42 is provided with a valve 43 outside the presser plate 31 so that the deformed hollow portion 41 can be expanded by supplying a necessary amount of fluid. Thereby, the shape of the side wall part 331 of the packing material 33 which contacts the inner peripheral surface of the insertion port 54 of the joint part 51 can be appropriately changed according to the contact angle to the insertion port 54. The degree of adhesion to the inner peripheral surface of the joint portion 51 can be increased.

  Further, in the illustrated embodiment, as the following means, a plurality of protrusions or a large number of protrusions 44 are provided on the contact surface 332 where the packing material 33 contacts the inner periphery of the receiving port 53 and the insertion port 54 of the joint portion 51. Is formed. The protrusions or protrusions 44 formed on the contact surface 332 may be any, and the degree of adhesion to the inner peripheral surface of the joint portion 51 can be increased as compared with the case where the contact surface 332 is smooth. The space between the joint portion 51 can be watertight.

  Furthermore, in the illustrated embodiment, the contact surface 332 of the packing material 33 is formed as an inclined surface having a predetermined inclination angle in the tube axis direction as the follower. The inclination of the contact surface 332 of the packing material 33 is preferably formed on an inclined surface whose outer side is higher than the inner side of the side wall portion 331 as shown in the figure. Moreover, the inclination of the contact surface 332 of the side wall part 331 may be formed not only in one of the opposing side wall parts 331 but in both.

  Further, as shown in FIG. 4, as a follow-up means, the vicinity portion 45 of the abutting surface 332 of the packing material 33 is formed of a material having a hardness lower than the hardness of the portion excluding the vicinity portion 45 of the abutting surface 332. May be. This also makes it possible to increase the degree of adhesion between the inner peripheral surface of the joint portion and the abutting surface 332 of the packing material 33, and it is possible to easily and reliably perform watertight sealing between the two.

  With such a configuration, in the hydraulic pressure test apparatus 1 of the present invention, the test space support means 2 supports the pressing portion 3 along the inner peripheral surface of the joint portion 51, and presses the action shaft 32 of the pressing portion 3. When the pressure is applied, the packing material 33 comes into contact with the insertion port 54 of the joint portion 51 and the inner peripheral surface of the receiving port 53. At this time, the contact surface 332 of the packing material 33 is inserted into the insertion port 54 and the receiving port 53 by supplying the fluid to the deformation hollow portion 41 and deforming it so as to follow the bending angle of the insertion port 54. Adheres closely to the inner peripheral surface. Such an operation is performed on all the pressing units 3.

  In addition, due to the action of the protrusions or protrusions 44 formed on the contact surface 332 of the packing material 33, the degree of adhesion with the inner peripheral surface of the joint portion 51 is increased, and the contact surface 332 is provided with an inclination. A reliable watertight seal is possible.

  As a result, a test space that is watertightly sealed between the joint portion 51 and the pressing plate 31 is formed over the entire circumference of the inner peripheral surface of the joint portion 51. Water is poured into the test space 11 which is closed by the pressing portion 3 and formed on the inner peripheral surface of the joint portion 51 by an appropriate pump device provided with a pressure gauge. The water pressure test is performed by injecting water having a predetermined water pressure into the test space 11 to fill the test space 11 and then checking whether there is any water leakage from the seal portion 52. Thereby, the presence or absence of the water pressure resistance in the joint part 51 can be grasped, it can be confirmed that a pipe having a bending angle is possible, and the reliability of the pipe line 5 can be increased.

  In the present invention, the follow-up means of the pressing plate 31 may be provided with any one of the above-described plural forms, or may be a combination of plural forms, and has high water tightness. It can be demonstrated to check the water pressure resistance and water stoppage of the joint portion 51.

  The present invention provides a pipe line embedded in the soil with a small bending angle, and when piping through a joint along a gentle curved line, or between straight pipes by the action of earth pressure or the like in the embedment process. In order to confirm the water pressure resistance and water stoppage of the joint by conducting a water pressure test at the joint of the pipe line when the joint is formed with a slight angle along the pipe and along a gently curved line. It can be suitably used.

It is explanatory drawing which partially fractures | ruptures and shows an example of the water pressure test apparatus of this invention in the pipe-axis direction of a pipe line. It is a fragmentary sectional view showing an example of a piping way which tests with a water pressure test device concerning the present invention. It is explanatory drawing which shows the structure of the pressing part of the water pressure test apparatus which concerns on this invention with the partial cross section of a pipe-axis direction. It is explanatory drawing which shows the other structure of the pressing part of the hydraulic test apparatus which concerns on this invention with the partial cross section of a pipe-axis direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water pressure test apparatus 11 Test space 2 Test space support means 3 Pushing part 31 Holding plate 32 Action shaft 33 Packing material 331 Side wall part 41 Deformation hollow part 42 Fluid supply line 43 Valve 44 Protrusion 5 Piping path 51 Joint part 52 Seal part 53 Receptacle 54 Insertion

Claims (6)

A test space support means arranged in an annular shape facing the pipe inner peripheral surface at the joint portion of the pipes sealed by the seal portion; and an insertion port side of the joint inner peripheral surface connected to the test space support means; It has a pressing part that covers the two tip parts on the receiving side and forms a test space,
The pressing portion is formed to have a curved surface that is divided into a plurality of circumferential directions along the inner peripheral surface of the joint portion, and is packed with a packing material on a surface facing the inner peripheral surface of the joint portion and is pressed by the joint portion. And a working shaft that supports and presses each of these presser plates radially outwardly,
The pressing plate and the packing material are formed in a substantially concave groove shape, and the packing material is provided with a follow-up means for causing the shape of the packing material to follow the bending angle of the insertion port with respect to the joint port.
The pressing space is supported by the test space support means so as to be along the inner peripheral surface of the joint portion, a pressing force is applied to the action shaft of the pressing portion, and a pressing plate connected to each action shaft is provided on the inner peripheral surface of the joint portion. It is arranged across the both ends of the insertion port side and the receiving port side, the packing material forms a test space by watertight sealing between the joints by the following means, and the test water is injected into the test space. A water pressure test apparatus characterized in that a water pressure test of a joint portion is made possible.   As the follow-up means, inside the packing material, deformed hollow portions capable of supplying fluid are formed on both side walls of the groove shape of the packing material, respectively, and these deformed hollow portions receive fluid from the outside of the packing material. A fluid supply line that can be supplied is connected, and by supplying fluid to each deformed hollow part, the deformed hollow part is expanded to change the shape of the side wall of the packing material, and the contact angle to the packing material insertion port The water pressure test apparatus according to claim 1, wherein the pressure is changeable.   2. A plurality of protrusions or a plurality of protrusions are formed on the contact surface where the packing material contacts the inner peripheral surface of the joint opening and the insertion opening as the follower means. 2. The water pressure test apparatus according to 2.   As the follow-up means, the contact surface on which the packing material contacts the inner peripheral surface of the joint port and the insertion port is formed as an inclined surface having a predetermined inclination angle in the tube axis direction. The water pressure test apparatus according to any one of claims 1 to 3.   5. The water pressure test apparatus according to claim 4, wherein the inclined surface of the packing material is formed into an inclined surface whose outer side is higher than the inner side of the side wall portion.   As a follow-up means, the portion of the contact surface where the packing material contacts the inner peripheral surface of the joint opening and the insertion port is formed of a material having a hardness lower than the hardness of the portion other than the vicinity of the packing material. The water pressure test apparatus according to claim 1, wherein the water pressure test apparatus is provided.

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