JP3749195B2 - Water pressure tester - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water pressure tester that inspects watertight performance before refilling a joint portion of a pipe such as a cast iron pipe buried in the ground, and is particularly effective for a small and medium diameter pipe.
[0002]
[Prior art]
When constructing a pipeline by inserting and joining another tube's insertion port in sequence with a watertight packing to the receiving port of one tube, it is not preferable that leakage occurs in that pipeline. Since leakage occurs at the pipe joint, it is necessary to test the water tightness of the pipe joint.
[0003]
In the water pressure test of the joint part, as described in Japanese Utility Model Publication No. 60-15155, etc., after joining work, a person enters the pipe with a water pressure tester called a test band at each joint part position. There is a technology that performs water pressure tests by manually spreading and adhering the band on the inner surface of the pipe to detect water leakage due to joint failure.
[0004]
The test that this person enters into the pipe line is to set the above test band to the corresponding joint part, but there are operations such as entering the pipe and tightening the fastening bolt, so the applicable diameter of the pipe is It can only be used in the case of 800mm or more, where people enter and do not interfere with work.
[0005]
For this reason, in the case of a diameter of 700 mm or less where a person cannot enter the pipe, the pipe (pipe) is filled with water after a certain length of pipe and a water pressure test is performed on each joint. At this time, the pipe cannot be backfilled until a water pressure test is performed and it is confirmed that there is no water leakage in the pipe. Also, if it is necessary to backfill the pipe before the water pressure test, or if there is a water leak in the water pressure test, it must be dug up and confirmed to identify the location of the water leak.
[0006]
Even in the construction of a pipe having a diameter of 700 mm or less, as a water pressure tester capable of determining the quality of the joint without human being entering the pipe, it is disclosed in Japanese Patent Laid-Open No. 2001-272300, and FIG. There is what is shown in.
[0007]
The water pressure tester A is composed of a watertight cylindrical body 10 that is closed on both sides. The cylindrical body 10 is formed with expansion / contraction portions 11 and 11 over the entire circumference with a certain length in the cylinder axis direction. A water injection hose 12 and an exhaust hose 13 that are open on the outer surface between the expansion / contraction portions 11 and 11 are connected, and a water injection hose 14 and an exhaust hose 15 that are open in the cylindrical body 10 are connected.
[0008]
For example, as shown in the figure, after inserting the insertion port 2 of the other pipe P through the watertight packing 3 into the receiving port 1 of one pipe P, one opening (pipe end) of the pipe P is inserted. The water pressure tester A is inserted into the pipe so that the joint part a is located between the both expansion and contraction parts 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14 and exhausted from the exhaust hose 15. If exhausted sufficiently, the hose 14 is closed and water is poured, and both expansion / contraction parts 11 and 11 are inflated as shown by chain lines in FIG. Watertight. Thereafter, water is injected between the expansion / contraction portions 11 and 11 from the water injection hose 12 and exhausted from the exhaust hose 13. When exhausted sufficiently, the hose 13 is closed and further water is injected, so that the water pressure at the joint portion a can be predetermined. For example, the hose 12 is closed and water leakage is inspected by a change in water pressure within a predetermined time in the joint part a.
[0009]
[Problems to be solved by the invention]
The cylindrical body 10 is usually made of a rubber tube. Conventionally, the central portion and both ends of the cylindrical body 10 are formed as a reinforcing layer 17 in which a reinforcing material such as cloth is embedded, and side plates 16 are fitted to both ends to form a steel band ( Steel band) 18 is fastened. In general, in order to perform a high water pressure test of the joint part a, it is necessary to apply a high water pressure also to the cylindrical body 10 to firmly press the expansion / contraction part 11 to the inner surface of the pipe P to make it watertight. In FIG. 14, when a high water pressure is applied to the cylindrical body 10, the end 10a of the cylindrical body 10 may be displaced from the cylindrical flange 16b of the side plate 16 (deviation: t) as shown in FIG. If the deviation t occurs, water leaks from the inside of the cylindrical body 10 or the water pressure in the cylindrical body 10 and the water pressure in the joint part a change, so that an accurate water pressure test is not performed.
[0010]
Moreover, when rubber | gum which can endure high water pressure is used for the cylindrical body 10, it is necessary to change the material of the reinforcement layer 17 to a high intensity | strength thing, such as a metal fiber, or to increase the number of windings. As a result, the flexibility of the entire cylindrical tube 10 is lost, and as shown in FIG. 15, the cylindrical body 10 does not shrink to its original state and the wrinkles b remain as shown in FIG. It may become the state of.
[0011]
Furthermore, as shown in FIG. 13, the water pressure tester A needs to be set so that the joint part a is located in the middle between the both expansion and contraction parts 11 and 11, and sufficient water pressure must be applied to the joint part a. However, as shown in FIG. 16, the set is not appropriate, the expansion / contraction part 11 may be displaced, and the joint part a may be blocked. If it is blocked, the water pressure is not properly applied to the joint part a, and an appropriate water pressure test is not performed. Further, when the reinforcing layer 17 deteriorates, as shown in the figure, the openings 12a and 13a of the water injection hose 12 and the exhaust hose 13 also approach the inner surface of the pipe P, and in the worst case, they are closed in contact with each other, thereby smooth water injection and exhaust. Cannot be performed. The deterioration of the reinforcing layer 17 becomes more severe as the applied water pressure of the cylindrical body 10 and the joint part a becomes higher.
[0012]
Further, if the hydraulic tester A is long, for example, as shown in FIG. 17, in the deformed tube portion, the hydraulic tester A does not advance smoothly in the deformed portion, and the joint portion A is connected to both expansion / contraction portions 11. , 11 may not be located.
[0013]
Furthermore, the water pressure tester A is provided with casters 19 at both ends so that the movement in the pipe P can be performed smoothly. However, conventionally, as shown in FIG. 18, the support rod (leg) 20 of the caster 19 is bolted to the cylindrical flange 16b of the side plate 16, and adjustment of the protrusion amount of the caster 19 makes the support rod 20 long. This is done by moving as shown by the arrow through the hole 20a. This work involves the work of loosening and tightening the front and rear bolts 20b, and is troublesome. Moreover, since the position of the caster 19 is also determined at the fastening position of the front and rear bolts 20b, the positional accuracy of the caster 19 depends on both the fastening position and the fastening degree. For this reason, if the position accuracy of the caster 19 is poor and it is not an appropriate position, the axial centers of the pipe P and the water pressure tester A are greatly separated, and there is a problem in applying uniform water pressure to the joint part a. Further, if the axial center is displaced, there is a problem that the entire circumference of the expansion / contraction part 11 is difficult to be brought into close contact with the inner surface of the pipe P.
[0014]
In view of the above circumstances, the present invention is, for example, a first object to be able to withstand a high water pressure test of 0.5 MPa or more, and a second object to be able to adjust the position of casters smoothly and accurately. It is an issue.
[0015]
[Means for Solving the Problems]
In order to achieve the first object, the present invention is configured to join a cylindrical fixing bracket to the entire circumference of the end edge of the expansion / contraction portion forming both sides of the cylindrical body on the same axis, and connect the fixing bracket to the cylinder. It was decided to screw onto the flange on the entire circumference of the side plate that closes the prison side of the body.
[0016]
This is because screwing can be firmly joined, so that even if a high water pressure is applied to the cylindrical body, the cylindrical body and the side plate are hardly displaced. For joining the expansion / contraction portion (cylindrical body) and the fixing bracket, means such as simultaneous baking adhesion at the time of rubber vulcanization can be adopted in addition to an adhesive.
[0017]
As another means, according to the present invention, a tension bar is stretched between side plates closing both sides of the cylindrical body, and a spring is provided on the tension bar to bias the side plates away from the tension bar. Normally, due to the urging force of the spring, the cylindrical body (expansion / contraction part) is in a state of being expanded and contracted. When water is injected into the cylindrical body (when water pressure is applied), the expansion / contraction part expands against the spring, If water pressure is removed, it is restored by the biasing force of the spring. For this reason, there is no fear that wrinkles will occur even if the expansion / contraction part has a high strength so as to withstand high water pressure.
[0018]
Furthermore, as another means, the present invention provides a plurality of projections between an opening portion of the water injection hose that opens to the outer surface between the two expansion / contraction portions, and the expansion / contraction portion, and forms a water conduit between the projections. It is.
[0019]
In this means, as shown in FIG. 16, even if the opening of the water injection hose approaches or comes into contact with the inner surface of the pipe due to deterioration of the expansion / contraction part or application of high water pressure, there are protrusions around the opening. Since a water channel is formed, an appropriate water pressure is applied to the joint through the water conduit. Also, even if the hydraulic pressure tester and the joint part are misaligned and the inside of the expansion / contraction part may block the joint part, a water conduit is formed by a protrusion inside the expansion / contraction part. Appropriate water pressure is applied to the joint through the water conduit.
[0020]
Thus, the formation of the water conduit is not necessarily required to form a space between the inner surface of the pipe and the cylindrical body by the reinforcing layer that does not expand, as will be described later, and the reinforcing layer portion that reliably secures the space. The cylindrical body can be shortened, and the length of the hydraulic tester itself can be shortened.
[0021]
As another means, the present invention fixes the end of the expansion / contraction part to the flange on the entire circumference of the side plate that closes both sides of the cylindrical body, and the outer periphery of the expansion / contraction part of the inner end edge of the fixed part. Fit a fixing ring that presses the expansion / contraction part inward, or fit a cylindrical fixture that can be reduced in diameter to the outer peripheral surface of the end edge of the expansion / contraction part. A cylindrical flange on the entire periphery of the side plate that closes both sides of the cylindrical body was fitted, and a buckle was fitted on the outer surface of the fixture and tightened.
[0022]
The expansion / contraction part is generally a tube made of an elastic body such as rubber, and when the end part is pushed inward, the turning-up of the tube due to the horizontal is reduced. In addition, if the expansion / contraction portion is pressed with a fixing tool that reduces the diameter, the fixing strength increases. In this way, if the bonding strength between the side plate and the end of the cylindrical body (expansion / contraction part) is increased, even if a high water pressure is applied to the cylindrical body, the displacement between the side plate and the tube is less likely to occur. The joining width in the length direction can be narrowed, and the length of the cylindrical body can be shortened.
[0023]
Furthermore, as another means, the present invention is provided with protrusions over the entire circumference of both the expansion and contraction portions so that the protrusions are pressed against the inner surface of the pipe. Compared with the case where the surface of the expansion / contraction part is in pressure contact, the direction in which the protrusion protruding from the surface is in pressure contact is surely made over the entire circumference, and the water tightness is high. Obtaining this high water tightness is suitable for the high water pressure test of the joint.
[0024]
In order to achieve the second problem, the present invention provides a support rod for the caster so as to be swingable in the cylindrical body, and a bolt provided in the cylindrical body is inserted into the support rod, A nut that prevents the support rod from swinging inward is screwed in, and the support rod is fixed at an arbitrary swing position by the screwing position of the nut.
[0025]
If the support rod is fixed at an arbitrary swing angle, the swing point of the support rod is fixed, and the position of the caster is determined by the swing angle. That is, since it is determined by one element, adjustment is easy and accuracy is high.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
One embodiment of the present invention that achieves the first object is a hydraulic tester for a joint part in which the insertion port of the other tube is inserted into the receiving port of one tube via a watertight packing, The water injection hose is formed of a watertight cylindrical body that is closed, and has an expansion / contraction portion over the entire circumference with a certain length in the cylinder axis direction, and is open to the outer surface between the expansion / contraction portions. There monitor and that it is connected, the opening to the water injection hose is connected to the cylindrical body, the tube, placed in the cylindrical body so that the joint portion is located between the two inflation and deflation portion, wherein Conventionally, water is injected from the water injection hose into the cylindrical body, the both expansion / contraction parts are inflated, pressure-welded over the entire inner surface of the pipe to make both sides of the joint part watertight, and water is injected from the water injection hose between the expansion / contraction parts. In a known hydraulic pressure tester, the expansion / contraction part is made of an elastic tube, and A cylindrical fixing bracket the entire circumference edge of the tube joined I is addressed on the same axis may be adopted a configuration in which set screw the mounting brackets to the entire periphery of the flange of the side plates closing both sides of said cylindrical body.
[0027]
In this configuration, the exhaust hose of the cylindrical body and the joint portion is not necessarily provided, but an exhaust hose can be provided as in the prior art, and at that time, only the joint portion side can be provided.
[0028]
As another embodiment, in the above-described conventionally known hydraulic pressure tester, the expansion / contraction part is made of a rubber tube, a tension bar is spanned between side plates closing both sides of the cylindrical body, It is possible to adopt a configuration in which a spring that biases the both side plates away is provided.
[0029]
In this configuration, one end of the tension bar penetrates the side plate closing the side surface of the cylindrical body movably with water tightness, a nut is screwed, and the spring is interposed between the side plate and the tension bar stopper. If it has, it can adjust the space | interval of the said side plate and a stopper with the screwing amount of the said nut.
[0030]
Furthermore, as another embodiment, in the above-described conventionally known hydraulic pressure tester, a plurality of protrusions are provided between the expansion / contraction portions from the opening portion of the water injection hose that opens on the outer surface between the expansion / contraction portions, The structure which formed the water conduit between protrusions can be employ | adopted. The shape and arrangement of the protrusions may be any as long as they can form a water conduit, and for example, a protrusion extending from the opening of the water injection hose to the expansion / contraction part can be employed.
[0031]
As another embodiment, in the above-described conventionally known hydraulic pressure tester, the expansion / contraction part is made of an elastic tube, and the flange of the entire side plate of the side plate closes both sides of the cylindrical body at the edges of the tube. To the outer periphery of the tube at the inner edge of the fixing portion, and a fixing ring that presses the tube inward is fitted, or the outer diameter of the entire circumference of the end of the tube expansion / contraction portion is reduced. A configuration in which a cylindrical fixture that can be fitted is fitted, a cylindrical flange of the entire circumference of the side plate that closes both sides of the cylindrical body is fitted to the inner circumference of the end edge of the tube, and a fastening band is fitted to the outer surface of the fixture Can be adopted.
[0032]
In the case where the latter fixing tool is fitted, if the cylindrical fixing tool is made of an elastic body such as rubber, the tube (expansion / contraction part) is almost the same quality, so both are familiar. The rubber absorbs irregularities caused by tightening of the fastening band, and the fixing force becomes uniform, and the water density over the entire circumference is also made uniform.
[0033]
As still another embodiment, in the above-described conventionally known hydraulic pressure tester, a protrusion extending over the entire circumference is provided in the both expansion and contraction portions, and the protrusion is pressed against the inner surface of the pipe. A configuration may be employed.
[0034]
As an embodiment of the invention that achieves the second problem, in the above-described conventionally known hydraulic pressure tester, a caster is provided around the cylindrical body so that the cylindrical body is movable, and the support rod of the caster is The bolt provided in the cylindrical body and swingably provided in the cylindrical body is inserted into the bolt, and the nut is screwed into the bolt to prevent the support rod from swinging inward. A configuration in which the support rod is fixed at an arbitrary swinging position by the screwing position of the nut may be employed.
[0035]
At this time, the displacement (twist) of the bolt with respect to the support rod accompanying the swinging of the support rod is absorbed by the movement of the bolt in the long hole by making the hole of the support rod through which the bolt is inserted into a long hole. As in the embodiment, well-known means such as absorption by rotation of the block 32 through which the bolt is inserted is appropriately adopted.
[0036]
Each of the above means and each embodiment thereof can be selectively used in combination with the two, three, etc., respectively, and the combined use can exhibit the respective actions and effects. Also, by appropriately selecting the degree of expansion of the expansion / contraction part, the applicable pipe diameter can be increased, for example, one or more diameters.
[0037]
【Example】
FIG. 1 to FIG. 4 show an embodiment, which is composed of a watertight high pressure resistant rubber cylindrical body 10 which is closed on both sides as in the prior art, and this cylindrical body 10 is separated by a certain length in the cylinder axis direction. The expansion / contraction portions 11, 11 are formed over the entire circumference, and the water injection hose 12 and the exhaust hose 13 that open to the outer surface between the expansion / contraction portions 11, 11 are connected, and the water injection that opens into the cylindrical body 10. The hose 14 and the exhaust hose 15 are connected.
[0038]
The cylindrical body 10 between the expansion / contraction portions 11 and 11 is a reinforcing layer 17 mixed with fibers and the like, and does not expand so much even when water pressure is applied as shown in FIG. On the middle outer periphery of the expansion / contraction part 11, a protrusion 21 is integrally formed over the entire periphery. The contact surface of the ridge 21 with the pipe P may be flat, but as shown in FIG. 12, a flange 21a is formed over the entire circumference (FIG. 12A), or one end 21b is formed over the entire circumference. Are formed in a wing shape obliquely (same as (b)), and a ridge 21c is formed over the entire circumference (same as (c)), so that the abutting portion is made flexible and the abutting area is reduced. By doing so, it is preferable to ensure uniform contact performance over the entire circumference and to increase the surface pressure per unit area. Thereby, even if it does not raise the water pressure in the below-mentioned cylindrical body 10 extremely, the processus | protrusion 21 can press-contact to the pipe P inner surface exactly, and sufficient watertightness of the expansion / contraction part 11 can be obtained. The number of the protrusions 21 is arbitrary, and the protrusions 21 may be integrated with the cylindrical body 10 or may be adhered by pasting or welding.
[0039]
The side plate 16 that closes the opening on both sides of the cylindrical body 10 is made of a steel plate or the like, and has cylindrical flanges 16a and 16b on both sides of the periphery, and the end portion of the cylindrical body 10 on the outer peripheral surface of both flanges 16a and 16b. 10a is fitted. A cylindrical rubber 22 reinforced by mixing fibers or the like is fitted on the outer peripheral surface of the cylindrical end 10a extending over both the flanges 16a and 16b, and a steel fastening band with a buckle is fitted on the outer periphery of the rubber 22. 18 is fitted, the band 18 is reduced in diameter by the buckle, and the end portion 10a of the cylindrical body 10 is pressed and fixed to the flanges 16a and 16b via the reinforcing rubber 22. At this time, the end 10a of the cylindrical body 10 bites into the groove 16c extending over the entire outer periphery of the flanges 16a and 16b, a high water stop surface pressure is obtained, and the fixing thereof is more reliable (see FIG. 4). . As the rubber 22, a material that does not reinforce without mixing fibers and the like, and other elastic bodies can be adopted.
[0040]
As shown in FIG. 3, a cylindrical fixing bracket 24 is joined and fixed to the end of the cylindrical body 10 with an adhesive, and the fixing bracket 24 is fastened to the flange 16b with bolts and nuts 25. The ten ends are firmly fixed to the side plate 16. Thereby, even if a high water pressure is applied in the cylindrical body 10, for example, a water pressure of 0.5 MPa or more is applied, the cylindrical body 10 is not displaced from the side plate 16.
[0041]
A tension bar 26 passes through the side plates 16 and 16, and nuts 27 are screwed into the ends thereof. In addition, a coil spring 28 is fitted into the tension bar 26 in the cylindrical body 10, and the spring 28 is positioned between the stopper 26 a fixed to the tension bar 26 and the side plate 16, and in a compressed state, the cylindrical body 10. The side plate 16 is fixed, and the cylindrical body 10 is normally extended by the biasing force. The urging force of the spring 28 is appropriately selected according to the screwing degree of the nut 27. The stopper 26a may have a screw nut structure, and the urging force of the spring 28 may be adjusted at the screw position of the nut (stopper 26a).
[0042]
A caster 19 is provided via a support rod 20 in the inner circumference of the outer flange 16 b of the side plate 16 in the fourth quarter. The position of the caster 19 is arbitrary, such as a quartile. As shown in FIG. 4, the support rod 20 is swingable in the radial direction of the flange 16b with a pin 31, and a bolt 33 erected on the flange 16b passes through a block 32 on the side surface. . The block 16 is rotatably fitted to the support rod 20, and the block 16 rotates around the fitting point to absorb the relative displacement of the bolt 33 with respect to the swinging of the support rod 20. Further, nuts 34 screwed into bolts 33 are pressed against both sides of the block 32, and after adjusting the protrusion degree of the caster 19 by making the support rod 20 an arbitrary swing angle as shown by a chain line from the solid line in FIG. By fastening the nuts 34, the position is fixed.
[0043]
As in the prior art, a moving rod (insertion rod) 30 can be attached to the side plate 16 with a clamp or the like. This hook 30 can be added, and is added by the length of the pipe P. For example, if the length of the collar 30 is 1.0 to 1.5 m, then 4 or 5 pipes are added if the pipe P is 5 to 6 m.
[0044]
This embodiment has the above-described configuration. Next, its operation will be described. The insertion port 2 of the subsequent (other) pipe P is connected to the insertion port 2 of the subsequent (other) pipe P and the watertight packing 3 is installed. After intervening and joining, as shown in FIG. 1, the hydraulic pressure tester A is inserted into the pipe from the receiving port 1 side of the backward pipe P, and the joint part a is connected between the expansion / contraction parts 11, 11. Is in the position. At this time, the caster 19 is adjusted so that the pipe P and the water pressure tester A have substantially the same axial center, and the water pressure tester A is inserted with the rod 30.
[0045]
In this state, as shown in FIG. 2, water is injected from the water injection hose 14 into the cylindrical body 10 to expand the cylindrical body 10 (expanded / contracted portion 11), and the expanded / contracted portions 11, 11 are pressed against the inner surface of the pipe P. . As a result, the joint portion a becomes a sealed space, and the exhaust hose 15 is appropriately closed by a valve (not shown). When the inside of the cylindrical body 10 reaches a specified water pressure, the valve (not shown) is closed and the water pressure is maintained. At this time, as shown by a chain line in FIG. 2, the exhaust port 15a of the cylindrical body 10 is preferably extended upward so that it can be exhausted smoothly.
[0046]
Thereafter, water is poured from the injection hose 12 into the sealed space of the joint part a. At this time, the air in the sealed space is exhausted from the exhaust hose 13, and if exhausted sufficiently, the exhaust hose 13 is closed by a valve (not shown). Water is injected from the water injection hose 12 until the inside of the sealed space (joint portion a) reaches a specified water pressure. When the water pressure reaches a specified water pressure, for example, 0.5 MPa, the injection hose 12 is closed by a valve (not shown), The inside is maintained at the specified water pressure. Incidentally, since the water injection from the water injection hose 12 into the joint part a flows downward from the water injection port 12a and is filled with water from the lower part, the water can be smoothly exhausted from the exhaust port 13a. Moreover, in order to exhaust reliably, it is good to provide the hose 13b from the exhaust port 13a to near the inner surface of the receiving port 1 as shown by a chain line in FIG. At this time, the hose 13b should be flexible so that the movement of the water pressure tester A is not hindered.
[0047]
The maintenance time is defined, and the defectiveness of the watertight packing 3, that is, the leakage state is inspected by the decrease of the water pressure in the sealed space within the specified maintenance time. When the inspection is completed, water is discharged from each of the hydraulic hoses 12, 13, 14, and 15 to contract the cylindrical body 10 and discharge water from the joint portion a. At this time, the spring 28 surely contracts (extends) the cylindrical body 10 without wrinkles b. Subsequently, the water pressure tester A is led out of the pipe P.
[0048]
If water leakage has occurred, the joint portion A is reinserted or the watertight packing 3 is replaced. If not, the next pipe P is connected and the water pressure inspection of the joint portion a is performed. The joint part a may be inspected every time one pipe P is connected, but after connecting any number of pipes P, the hydraulic pressure tester A is inserted, and all the joint parts a are sequentially tested. You may test the water pressure separately.
[0049]
FIG. 5 to FIG. 9 show another embodiment. This embodiment does not form the reinforcing layer 17 in the central portion of the cylindrical body 10, and from the water inlet 12a and the exhaust outlet 13a of the water injection hose 12 and the exhaust hose 13. A water conduit 41 is formed across the expansion / contraction part 11. As shown in FIGS. 6 and 7, the water conduit 41 can be formed by providing protrusions 42 over the required width in the circumferential direction, or by providing protrusions 43 as shown in FIG. 9. . The protrusions 42 and protrusions 43 may be provided integrally with the cylindrical body 10 as shown in FIGS. 6, 7 and 9, but are provided by bonding a separate object 44 as shown in FIG. 8. May be.
[0050]
In this embodiment, as shown by a chain line in FIG. 5, the center portion of the cylindrical body 10 swells, and the water injection hole 12a and the exhaust port 13a may be close to the inner surface of the pipe P to close the joint portion a. However, the formation of the water guide passage 41 by the protrusion 42 ensures a passage from the water injection hole 12a and the exhaust hole 13a into the joint portion a, so that water is smoothly injected and exhausted. Further, as shown in FIG. 16, even if the joint part a and the hydraulic pressure tester A are misaligned (see the chain line in FIG. 5) and the joint part a is blocked by the water conduit 41, similarly, Water is smoothly poured into the joint a. Also in this embodiment, the reinforcing layer 17 can be formed between the both expanded and contracted portions 11 and 11.
[0051]
FIG. 10 shows still another embodiment, in which the width of the flanges 16a and 16b of the side plate 16 is reduced and the length of the hydraulic pressure tester A is shortened. The fixing ring 51 is fitted to the outer periphery of the cylindrical body 10 so that the end edge 10a of the cylindrical body 10 is pushed slightly inward. In this pushed state, the cylindrical body 10 does not turn up from the edge of the flange 16b (side plate 16) when the cylindrical body 10 expands as indicated by a chain line in FIG. For this reason, as shown in the figure, the length of the hydraulic pressure tester A can be shortened as much as possible by omitting the flange 16a.
[0052]
Further, in this embodiment, the reinforcing layer 17 in the vicinity of the water injection hole 12a is not provided, and water injection and exhaust from the water injection hole 12a and the exhaust hole 13a are made smooth in the water guide passage 41, so that the space between the expansion and contraction portions 11 and 11 is shortened. This can also shorten the length of the water pressure tester A. Thus, by being able to shorten, as shown in FIG. 11, also in the joint part a of a deformed pipe part, the joint part a can be smoothly located between the both expansion / contraction parts 11 and 11. FIG.
[0053]
As in these embodiments, in the case where there is no reinforcing layer 17 in the water inlet 12a, most of the water pressure in the cylindrical body 10 acts on the diameter expansion of the expansion / contraction part 11 and smooth watertightness. Can be secured.
[0054]
The portion of the reinforcing layer 17 of the cylindrical body 10 can be constituted by a cylinder such as an iron plate or a resin plate. In addition, each example was a case of an S-shaped pipe joint of a ductile cast iron pipe, but the present invention is the same K-type, A-type, U-type, T-type, US-type, KF-type, UF-type, NS-type. Of course, the present invention can be applied to various types of joints such as the SII type, and can also be applied to various types of joints using rubber packing such as polyvinyl chloride pipes. Further, if the tension bar 26 can be bent by inserting a universal joint in the middle of the tension bar 26, the cylindrical body 10 can also be bent, and the passage of the bent portion such as the deformed pipe portion and the expansion / contraction portion 11 can be performed. Pressure welding is easy.
[0055]
【The invention's effect】
As described above, the present invention can withstand high water pressure by eliminating the displacement of the cylindrical body or forming a water conduit, and can perform a highly accurate water pressure test.
[0056]
In addition, by urging the both side plates in the direction away from each other by the spring, wrinkles are not generated when the cylindrical body is contracted, and damage due to the generation of wrinkles can be prevented. Furthermore, if a water conduit is formed, water is surely guided to the joint, and even if the hydraulic pressure tester and the joint are misaligned and the inside of the expansion / contraction part may block the joint, the water pressure test is performed without any problem. The length of the tester itself can be shortened in conjunction with ensuring the fixation of the side plate and the cylinder end.
[0057]
Further, according to the present invention, since the position adjustment of the moving caster is performed by changing one element, the operation is easy and the accuracy can be improved.
[Brief description of the drawings]
1 is a cross-sectional view of an operation of one embodiment. FIG. 2 is a cross-sectional view of an operation of the embodiment. FIG. 3 is an enlarged view of a main portion of FIG. FIG. 6A is a perspective view of the embodiment, FIG. 7B is a plan view of the embodiment, FIG. 7 is a cut side view for explaining the operation of the embodiment, and FIG. FIG. 9A is a plan view, FIG. 9B is a fragmentary cutaway front view of another embodiment, and FIG. 9B is a fragmentary cutaway front view of another embodiment. 11 is a sectional view of the main part of each example of the expansion / contraction part projection. FIG. 13 is a sectional view of the action of the conventional example. FIG. 14 is a sectional view of the action of the conventional example. Cross-sectional view of operation of conventional example [FIG. 16] Cross-sectional view of operation of conventional example [FIG. 17] Cross-sectional view of operation of conventional example [FIG.
A Water pressure tester P Pipe a Joint part 1 Receiving port 2 Inserting port 3 Watertight packing 10 Cylindrical body (rubber tube)
10a Cylindrical end 11 Expansion / contraction part 12, 14 Water injection hose 13, 15 Exhaust hose 16 Side plate 16a, 16b Side plate flange 17 Reinforcement layer 18 Fastening band 19 Caster 20 Caster support rod 21 Ridge 22 of expansion / contraction part Reinforcement rubber 24 Fixation Metal fitting 25 Bolt 26 Tension bar 27 Nut 28 Spring 30 Moving rod 31 Oscillating pin 32 Block 33 Adjustment bolt 34 Nut 41 Water conduit 42 Projection 43 Projection 51 Fixing ring

Claims (1)

A water pressure tester A for a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
The expansion / contraction portion 11 is made of an elastic tube, and a cylindrical fixture 24 is joined to the entire circumference of the tube 11 on the same axis, and the fixture 24 is connected to both sides of the cylindrical body 10. The water pressure tester is characterized in that it is screwed to the flange 16b of the entire circumference of the side plate 16 that closes the side plate.

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