JP2005214898A - Pressure-proof test device in tube fitting part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-proof test device in a tube fitting part of excellent workability. <P>SOLUTION: This pressure-proof test device arranged with a sleeve 12 inside the tube fitting, and pressure-connected with inner walls of adjacent tubes by band-like members 21, 21' having rigidity and flexibility to obtain water tightness is arranged with the two band-like members 21, 21' divided circumferential-directionally into a plurality of portions, hinge-joined in divided parts, having an outer part of an overlapped part formed into a tapered shape, and for pressurizing the adjacent tubes respectively, and diameter-enlarging structural chains 25, 25' of large sectional force having rigidity in an inner side of the two band-like members 21, 21'. In the pressure-proof test device, piston cylinder devices 28, 29 are combined, the sleeve 12 is pressure-connected respectively to the inner walls of the adjacent tubes of the tube fitting via the band-like members 21, 21', and a deformation following property to a tube inner wall face, and a rigidity function to counteract the expanding sleeve and band-like members are exhibited to secure water tightness uniform over the whole ares. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure test apparatus in which a sleeve is disposed inside a pipe joint portion, and is pressure-bonded to an inner wall of an adjacent pipe by a band-shaped member having rigidity and flexibility to obtain water tightness.

  In the pipeline construction, a water pressure test is performed on the pipe joint, and in the aging pipe survey, a water leak test is performed on the pipe joint. In such a water pressure test, an apparatus using a member having a ring-like structure commonly called a test band or the like is used. The test band can expand the rubber sleeve placed inside the pipe joint and crimp it to the adjacent pipe inner wall, thereby forming a sealed space on the inner periphery of the pipe joint, It is used for pressurizing the sealed space to determine the presence or absence of water leakage.

  In such a pipe joint water pressure test, the rubber sleeve that maintains water tightness is not deformed against the flexibility of attaching the rubber sleeve to the pipe joint with equal pressure and the water pressure for determining the water leakage of the pipe joint. The rigidity function is a necessary condition for the ring-shaped member. FIG. 6 shows an example of a conventional water pressure test apparatus in a pipe joint. In this water pressure test apparatus, a rubber sleeve s that maintains watertightness is disposed inside a pipe joint portion, and a large number of pressing fittings u are used to press the rubber sleeve s against the inner wall of the pipe t. The pressing metal u is radially attached to the bolts w provided on the circular holder v, and by tightening each bolt w, the rubber sleeve s is crimped to the inner wall of the pipe to obtain water tightness. The pressurized fluid in the pipe joint portion may be air other than water.

  However, the tube t is not concentric, but the center axis of the tube is not on the same straight line, due to differences in inner diameter due to manufacturing tolerances, differences in joints at the time of construction, bending, flattening of the pipe cross section due to earth pressure, etc. Usually it is not. For this reason, it has been necessary to adjust the amount of protrusion of the metal fitting u according to the direction and appropriately adjust the tightening force. Such adjustment work must be performed inside the narrow pipe t, and the workability is not good without any problem. Among them, since it is necessary to adjust the protruding amount of the pressing metal by the bolt operation, it is difficult to judge whether or not the feeding amount of all the bolts w is proper. s cannot be pressurized vertically. As a result, the pressure limit for obtaining water tightness may be lowered.

Utility model registration No. 2081443 Utility model registration No. 1945264 Utility Model Registration No. 1934989 Japanese Utility Model Sho 62-14354 Japanese Utility Model Sho 61-65337 Japanese Utility Model Sho 61-65336 No. 58-663340 Shokai 52-21887 Shoko 40-1918 No. 38-24199

  This invention is made paying attention to the said point, The subject is providing the pressure | voltage resistant test apparatus in a pipe joint part with favorable workability | operativity. Moreover, the other subject of this invention is providing the pressure | voltage resistant test apparatus in the pipe joint part which can ensure water-tightness at a high level.

  In order to solve the above-mentioned problems, the present invention relates to a pressure-resistant test apparatus in which a sleeve is disposed inside a pipe joint portion, and a band-shaped member having rigidity and flexibility is crimped to the inner wall of an adjacent pipe to obtain water tightness. Prepare two band-shaped members that pressurize the adjacent pipes as the shaped members, divide each band-shaped member into multiple parts in the circumferential direction, join the divided parts with hinges, and overlap both ends of the multiple parts Furthermore, the outside of the overlapped portion is tapered, and a rigid structural chain with a large cross-sectional force is placed inside the two band-shaped members, and the piston cylinder device is combined with the structural chain. In addition to the structure chain that expands in diameter, the inner end of the overlapping portion of the band-shaped member and the structure chain are engaged with each other so that the band-shaped member is expanded in diameter, and the band The member and the structural chain are loosely stopped at important points, and the sleeve is crimped to the inner wall of each adjacent pipe of the pipe joint part via the band-shaped member, and the contact point between the band-shaped member and the structural chain becomes the fulcrum of the arch. By dividing into a large number of arches of the chain, it can exhibit deformation followability to the inner wall surface of the pipe and a rigid function that can resist the sleeve and band-like member to be expanded, so that uniform water tightness can be secured over the entire area. It is a measure to do.

  The pressure test apparatus of the present invention is synonymous with a so-called test band, and is different from the conventional water pressure test apparatus in that it is intended to obtain water tightness in the pipe joint portion by a sleeve arranged inside the pipe joint portion. I'm doing it. Therefore, a so-called rubber sleeve or a sleeve made of a material having elasticity that can exhibit the same water tightness as that of the sleeve is used.

  A band-shaped member is used as means for pressing the sleeve against the inner wall of the tube to ensure water tightness. The band-shaped member shall be of two separate left and right strips that are crimped to the ends of the adjacent pipes, has flexibility along the inner wall of the pipe, and has a cross-sectional force that does not buckle due to the axial force due to expansion. Must be. For this purpose, individual band-like members are formed using a tough material such as a steel plate, and each band-like member is divided into a plurality of parts in the circumferential direction, and the parts can be folded and hinged by hinge joining. It shall comprise. Both ends of the individual band-like members are overlapped at the time of expansion, and the outer overlapping portion in contact with the sleeve is tapered so that smoothness is maintained.

A two-strand structural chain is used to individually expand the two band-like members from the inside and crimp the sleeve against the inner wall of the tube. A structural chain bears stress as a structural material, and can be defined as having a chain structure having the rigidity necessary for that purpose. It is also necessary for this structural chain to have a large section force, that is, a moment of section, or a section modulus.

  In order to expand the diameter of the two band-shaped members, one or more piston cylinder devices using a liquid as a working fluid are used together with the two-structure chain. The piston-cylinder device can be combined with a structural chain to increase or decrease the chain circumferential length, whereby the sleeve is connected to the inner wall of each pipe joint portion via two band-shaped members. Crimp to. The piston-cylinder device is therefore structurally part of the structural chain and can provide the output necessary for crimping the sleeve to the inner wall of the tube.

  However, it is desirable that the piston-cylinder device is mounted at the position of the structural chain opposite to the position of the hinge that allows the band-shaped member to be folded. The structural chain and the band-shaped member are engaged so that the two band-shaped members and the structural chain can be expanded and contracted in one piece, and the mounting and collecting operations can be performed with one touch, and the workability can be significantly improved. It is necessary to be able to be engaged with the inner end of the overlapping portion of the band-shaped member by means, and to be loosely stopped using a stopper so that it cannot be removed at a critical point.

  In the pressure test apparatus of the present invention having such a configuration, the contact point between the band-shaped member and the structure chain becomes an arch, and is divided into a number of arches of the structure chain, so that the deformation followability to the inner wall of the pipe is improved, A uniform watertightness can be ensured over the entire circumference. That is, the combination of the band-shaped member and the structural chain according to the present invention provides deformation followability with respect to the inner wall surface of the pipe, and at the same time, retains the sleeve and the band-shaped member that expands and deforms during the pressure test, and is high in order to ensure water tightness. It will exhibit the rigidity function.

  Since the sealed space is formed in the pipe joint portion by the pressure test apparatus of the present invention, the water pressure test can be performed by applying pressure to the space. The pressure source used in the operation of pressurizing the sealed space of the pipe joint and determining the presence or absence of water leakage may be water pressure, air pressure, or other fluid pressure. In addition, the pressure source of the above-mentioned piston cylinder apparatus needs to be a hydraulic pressure.

  Since the present invention is configured and operates as described above, it is caused by a difference in inner diameter based on a pipe manufacturing tolerance in a pipe joint portion, a step difference or bending of the joint at the time of construction, flattening of the pipe due to earth pressure, etc. Therefore, even in a situation where the central axis of the pipe is deviated from the same axis line or is not in a concentric relationship, the sleeve for maintaining the water tightness is formed by two band-shaped members and the inner wall of each part of the adjacent pipe. On the other hand, since pressure can be applied with an equal pressure, it is possible to simultaneously satisfy the conflicting functions of the deformation followability based on the flexibility function of the band-shaped member and the rigidity function of the band-shaped member that does not deform against the water pressure. As a result, the water-tightness can be ensured at a high level, and the workability according to the present invention until the tube joint is water-tight by the sleeve is very good. Unlikely to.

Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows an example of a pressure test apparatus 10 in a pipe joint according to the present invention, 11 and 11 'are pipes constituting the pipe joint, and 12 is a cylindrical member arranged on the inner surface thereof. Shows a sleeve, tube 11,
11 'is made of concrete, and the sleeve 12 is a so-called rubber sleeve. Pipe joint 13
As shown in FIGS. 4 and 5, it is sealed with a water sealing member 14 as a watertight means interposed between adjacent pipes 11 and 11 ', and a sleeve 12 is disposed on the inner surface. This is a place where a sealed space surrounded by the pipes 11 and 11 ′, the pipe water blocking member 14 and the sleeve 12 is formed.

  Sealing portions 16 and 16 'made of a rubber material whose hardness is softer than the rubber material of the sleeve 12 are used for the water-stop portion of the sleeve 12 covering the inner surface of the pipe joint portion 13 to obtain airtightness and watertightness. Yes. That is, the softer sealing members 16 and 16 'exhibit the effect of filling the unevenness of the inner wall of the aging pipe line to ensure airtightness and watertightness. The seal members 16 and 16 'are arranged so as to be fitted into the recesses 18 and 18' between the seal rods 17 and 17 'in contact with the inner walls of the tubes 11 and 11' (FIG. 3).

  In order to pressurize the sleeve 12 in contact with the inner wall of the adjacent tubes 11 and 11 ′, two band-shaped members 21 and 21 ′ divided into three parts and joined by two hinge portions 19 are adjacent to each other. 11 and 11 'are arranged inside the sleeve 12 respectively. The two band-shaped members 21 and 21 'have the same structure, and are made of a tough material such as a steel strip so that both end portions 22 and 23 overlap each other even at the maximum diameter expansion. In addition, the end portion 22 that is outward when superimposed is shaped so that the cross-sectional shape is tapered.

Each of the two band-shaped members 21 and 21 ′ has a three-divided configuration, and both end portions 22 and 23 having tip portions that become overlapping portions are hingedly connected to the central portion 24 so as to be foldable. Two structural chains 25 and 25 ′ having a large cross-sectional force are disposed on the inner portions of the band-shaped members 21 and 21 ′. The two-structure chains 25 and 25 'are formed by connecting link members 26 in a chain shape with a shaft member 27, and connecting a plurality of piston cylinder devices 28, 29, and 29 in series, and expanding and contracting the pistons. Thus, the entire circumference can be increased and decreased. In the illustrated example, one piston cylinder device 28 is used for folding, and the two piston cylinder devices 29, 29 are used for diameter expansion. All the piston cylinder devices 28, 29, 29 are provided at positions facing the hinge 19 portion. The two structural chains 25, 25 'can be engaged with support points 36, 37 planted on the inner end 23 of the band-like members 21, 21', and are also indicated by bolts and nuts at key points. It is stopped loosely to such an extent that it cannot be removed by the stopper 31 made. In the figure, reference numeral 32 denotes a hydraulic pump as a pressure source, which is connected to each piston cylinder device 28, 29, 29 by hydraulic hoses 33, 34, 34.

The pressure test apparatus 10 according to the present invention configured as described above includes two band-shaped members 21,
21 'and the structural chains 25, 25' can be handled in an integrated state,
Since it can also be carried into the interior of 11 ', the work is easy. The operation of making the sealed space of the pipe joint portion 13 by the apparatus 10 of the present invention is performed as follows. At the time of carrying in, of course, the piston cylinder devices 28, 29, 29 are contracted, the two structural chains 25, 25 'are bent, and the respective band-like members 21, 21' are bent and become small. It is the state of FIG.

First, the hydraulic pump 32 is operated to extend the folding piston cylinder device 28. As a result, a tension force is generated between the support point 35 fixed to one of the band-shaped member centers 24 and the support point 36 fixed to the band-shaped member end portion 23, and two strips follow the extension of the piston cylinder device 28. The band members 21, 21 'operate so that both end portions 22, 23 are lifted. During this time, even if the chain link is bent as shown in FIG. 1, the two band-shaped members 21 and 21 'are expanded with the extension of the piston-cylinder device 28, and the peripheral length is increased. Since it is pulled, it automatically becomes almost circular without the operator's hand.

  In order to bring the two band-shaped members 21 and 21 ′ into the expanded state from this state, the hydraulic pump 32 is further operated to drive the expanded pistol cylinder devices 29 and 29. Due to the extension of the piston cylinder devices 29 and 29, the support point 37 fixed to the one end portion 23 of the band-like members 21 and 21 'and the connecting shaft members 27 and 27' of the structural chains 25 and 25 'serve as contact points to expand the diameter. In accordance with the extension of the piston cylinder device 29, the band-like members 21, 21 'are individually expanded in diameter according to the state of the inner wall of the adjacent pipe. Thus, the apparatus of the present invention is in a suitable diameter-expanded state (FIG. 2), where the so-called test band is completely installed. In this state, the contact between the band-shaped members 21 and 21 'and the structural chains 25 and 25' serves as a fulcrum of the arch, and the sleeve 12 is divided into a plurality of arches of the structural chains 25 and 25 '. Therefore, watertightness can be secured.

For the pressure test, a pressurizer 38 is used to pressurize the pressure in the sealed space of the pipe joint portion 13 which is in a watertight state by a test band that has been attached through the pressure hose 39 and the pressure inlet 41, A total 40 will confirm the degree of decompression. FIG. 2 illustrates this situation. Further, FIG. 5 shows that the pipe joint portion 13 is caused by a difference in inner diameter due to manufacturing tolerances, a step difference or bending of the joint at the time of construction, flattening of the pipe due to earth pressure, etc. The test band wearing state in a situation where concentric circles are not relevant is shown. In the apparatus of the present invention, the two band-shaped members 21 and 21 'individually expand the diameters of the tubes 11 and 11' and crimp the sleeve 12, respectively. Necessary and sufficient confidentiality can be maintained. Reference numeral 42 denotes an air vent when the pressurized fluid is water.

  As the confidentiality test at the pipe joint, the most frequently used apparatus has the form shown in FIG. 6, and as described above, the workability in the narrow pipe is extremely bad and the weight is heavy. The device of the present invention has good workability and does not have the drawbacks shown in the prior art, while it cannot be used. There is a possibility that it can be used for pressure resistance testing.

Explanatory drawing before the operation | movement which shows an example of the pressure | voltage resistant test apparatus in the pipe joint part which concerns on this invention. Explanatory drawing which similarly shows the state after an action | operation. The cross-sectional view of what constitutes the device of the present invention. The cross-sectional view of this invention applied to the pipe joint part. The cross-sectional view of this invention which shows the state corresponding to the shift | offset | difference of an adjacent pipe | tube. Explanatory drawing which shows the representative example of the conventional test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pressure-resistant test apparatus 11, 11 'Pipe 12 Sleeve 13 Pipe joint part 14 Pipe water stop member 19 Hinge 21, 21' Band-shaped member 22, 23 Both ends of band-shaped member 24 Central part 25, 25 'structure of band-shaped member Chain 28, 29 Piston cylinder device 35, 36, 37 Supporting point

Claims (3)

A pressure-resistant test device that arranges a sleeve inside a pipe joint and presses the inner wall of an adjacent pipe by a band-like member having rigidity and flexibility to obtain watertightness, and pressurizes the adjacent pipe as a band-like member. Two band-shaped members are prepared, and each band-shaped member is divided into a plurality of portions in the circumferential direction, and the divided portions are joined by hinges, and both ends of the plurality of portions are overlapped and the outside of the overlapped portion is A taper-shaped band-shaped member with a large cross-sectional force and a rigid structural chain is placed inside the two band-shaped members. A piston cylinder device is combined with the structural chain. Engage the inner end of the overlapping part of the band-shaped member with the structural chain so that the diameter of the member is expanded, and loosen the band-shaped member and the structural chain at important points. The stopper and the sleeve are respectively crimped to the inner wall of the adjacent pipe of the pipe joint portion through the band-shaped member, and the contact point between the band-shaped member and the structure chain serves as a fulcrum of the arch, and is divided into a number of arches of the structure chain. Thus, a pressure test apparatus in a pipe joint that exhibits deformation followability to the inner wall surface of the pipe and a rigid function that can resist the sleeve and band-like member to be expanded, and can ensure uniform watertightness throughout the entire area. A piston cylinder device is installed at the position of the structure chain opposite to the hinge that allows the band-shaped member to be folded. By operating the piston cylinder device, the band-shaped member and the structure chain can be mounted and folded with one touch. The pressure resistance test apparatus according to claim 1. The pressure resistance test apparatus according to claim 1, wherein the structural chain is loosely stopped so as to be relatively movable in the circumferential direction with respect to the support portion implanted at the inner end portion of the band-shaped member.

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