JPH06221952A - Water pressure testing apparatus for pipe - Google Patents

Abstract

PURPOSE:To enable the testing of a water pressure of a pipeline regardless of the size of a pipe or the entry of an inspector by a method wherein a freely movable wheel is driven to be moved within the pipe, positioned with a monitor camera and lighting and a jack is operated to get a rubber ring tight on an internal wall of the pipe for the formation of a closed space. CONSTITUTION:A front base plate 1 and a rear base plate 2 are arranged in the direction of the axis of a pipe and both ends thereof are pierced with four tension bars 12 to be clamped together with a nut 13. Wheels 11 and 12 free to run are pivoted on both the base plates 1 and 2 and moved in the pipe with a drive mechanism so that a detection position is determined with a lighting 7 and a monitor camera 8 mounted on the front of the front base plate 1. Then, an oil pressure is supplied with a hydraulic pipe 16 in the tail to operate a hydraulic jack 6 so that a gradient surface 41 of a front slide cylinder 4 and a gradient surface 51 of a rear slide cylinder 5 are moved outward, causing rubber rings 3A and 3B attached to the base plates 1 and 2 to be pressed onto the internal surface of the pipe. Thus, a closed space is formed at a coupling part or the like desired to test a water pressure thereby enabling the testing of the water pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe hydraulic testing machine.

[0002]

2. Description of the Related Art For example, in a water pipe line laid in the ground or a pipe system installed as a part of factory equipment, a water pressure test for checking the presence of water leakage at pipe joints. is necessary. The joining means differs depending on the type of pipe, and the main structure is the joining structure of welding for steel pipes and for sockets and inserts for cast iron pipes. With any of these pipe types, there is no change in assuming a hydraulic test for the purpose of guaranteeing after installation, but the number of joints is extremely large, and a hydraulic test is performed at all of these locations. Therefore, the quality of the efficiency has a great influence on the efficiency of the entire piping work. For that reason, there have been many proposals for water pressure tests, each of which contributes to the rationalization of inspection.

For example, FIG.
It is quoted from the Japanese Patent Publication, and is intended for the joining of cast iron pipes as shown in the figure. The inner surface of the cast iron pipe is cement-lined, but the sealing material 1 with an L-shaped cross section, which is made of rubber magnet material, is provided at the tip of the insertion port where the iron material is exposed and the rear end of the receiving port.
01A and 101B are attached, and the bolt 10 is inserted from the pipe axis side of the sealing material through the seal band 102 and the annular frame 103.
4 is attached, the bolt 104 is rotated from the inner surface of the pipe to press the seal band 102, and the closed space V is formed.

Further, FIG. 5 shows another conventional technique, and shows a test instrument in which a tubular hollow elastic body 105 and an elastic ring body 106 are combined and integrally attached to a support frame 107 on the inner surface of a joint portion of a pipe ( This hollow elastic body 10 is fixed as in A).
5, a fluid having a pressure higher than a predetermined hydraulic test pressure is press-fitted into the inside of 5 to elastically deform the hollow elastic body, and is crimped to the inner surface of the tube as shown in FIG. It is the structure which forms the closed space V of.

[0005]

As illustrated in the above two prior arts, in the water pressure test of the joint portion of the pipe, a jig for testing is attached from the inner surface of the pipe body to the inner surface and sealed. The main method is to form a space and press fit a fluid for hydraulic test (not shown) into this space to inspect for leakage. However, the pipes such as cast iron pipes that are the target of the actual water pressure test not only occur when the inspector has a diameter that allows them to sneak into the pipes, but also frequently when they are small pipes that cannot be infiltrated. Therefore, in this case, the conventional technique described above is started,
Most of the prior art cannot be applied. Even if the inspector is a medium-large pipe that can be infiltrated, the inspector may not be able to enter the inside due to construction reasons. For example, in a partial repair such as replacing only a part of the existing pipeline, there is a problem that it is difficult to confirm by a hydraulic test after repair and renewal.

In order to solve the above problems, it is an object of the present invention to provide a testing machine which can easily perform a hydraulic test of a joint part of a pipe and other pipe lines without an inspector sneaking into the pipe. To do.

[0007]

A pipe hydraulic tester according to the present invention includes front and rear substrates 1 and 2 each having wheels 11 and 21 that can travel in the pipe and connected to each other in the axial direction of the pipe.
The rubber rings 3A and 3B, which are mounted on the respective inward side surfaces of the base plate and whose axial sides are sloped surfaces 31A and 31B, and the reverse sloped surfaces 41 at the same angle as the sloped surfaces 31A and 31B of the rubber rings,
A front sliding cylinder 4 and a rear sliding cylinder 5 each having 51 facing outward are supported in a water-sealed state between the front substrate 1 and the rear substrate 2, and the sliding cylinders 4 and 5 are moved in the axial direction. The above problem is solved by having the hydraulic jack 6 and the driving means and the detecting means for operation.

Further, in this basic configuration, it is a very preferable embodiment that the detecting means comprises an illumination 7 and a monitor camera 8 mounted on the front surface of the front substrate 1.

[0009]

3A and 3B are schematic front views showing the operation of the present invention. The water pressure tester is inserted near the test location inside the pipe, and travels outside the pipe or under the operation of the vertical shaft for installation work by means of wheels inside the pipe. Confirmation of the target inspection location is carried out by using a detection means mounted in front of the hydraulic testing machine, for example, an illumination and a monitor camera to determine the position of the hydraulic testing machine. At the time of this traveling (Fig. A), the hydraulic jack built in the machine was not operating, and the front and rear sliding cylinders 4 and 5 between the two boards 1 and 2 were recently approaching each other, and the reverse inclined surface thereof was formed. Without pushing up the inclined surfaces of the rubber rings 3A, 3B,
Both rubber rings are separated from the inner surface of the pipe P while being contracted in the axial direction.

The state of FIG. B is a schematic diagram of the positional relationship of each member when the position of the hydraulic tester is determined and the hydraulic test is performed.
That is, the operation of the hydraulic system from the outside of the pipe or from the vertical position starts, and the hydraulic jack 6 operates to expand the mutual positions of the front and rear sliding cylinders 4 and 5. As a result, the slanting surface 31 of the rubber ring with which the reverse slanting surfaces 41 and 51 of the moving sliding cylinder are engaged is lifted up like a wedge is pushed, and the two contacting surfaces press each other to move the rubber ring toward the inner surface of the pipe. It is forced to elastically deform toward and approaches, and finally comes into close contact with the inner surface. In this way, a closed space V surrounded by both rubber rings, the inner surface of the pipe P, and the joint portion is formed, and the presence or absence of leakage of water by supplying the test water for the water pressure test to the space from the separately provided water supply pipe. From outside the tube.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view showing one of the embodiments of the present invention, and FIGS. 2 (A), (B), (C) and (D) are A-A, BB, C- in FIG. Each cross section and side view of C are shown, respectively. In each drawing, the water pressure tester inserted into the cast iron pipe P includes a front substrate 1 and a rear substrate 2 in front and rear (right in FIG. 1 is the front) in the pipe axis direction, and each of the substrates has two substrates. Wheels 11 and 21 for traveling are pivotally supported. The drive mechanism (not shown) rotates the wheels for traveling. Four tension bars 12 parallel to the tube axis pass through both ends of both boards, and nuts 13 are screwed from the outer surface to integrally fasten them. An illumination 7 and a monitor camera 8 are attached to the front surface of the front substrate 1 to detect and position a joint portion to be subjected to a water pressure test. A hydraulic jack 6 is supported between the two substrates, and hydraulic pressure for operation is supplied by a hydraulic pipe 61 at the rear. A hydraulic jack requires water-tight protection to prevent test water from entering during a water pressure test.
In this example, the tubular portion integrally connected to the rear sliding barrel 5 has a double pipe structure of an outer barrel 52 and an inner barrel 53, and a Titon-shaped rubber ring 54 is sandwiched between the outer barrel and the inner barrel. It is set such that the test water is blocked by the rubber ring 54 and cannot enter the hydraulic jack 6 installed inside the inner pipe. The rod of the hydraulic jack is supported by a sliding spacer 62 around the rod, and the rod expands and contracts according to the operation of the hydraulic mechanism.

The reverse slope 41 of the front sliding cylinder 4 and the rear sliding cylinder 5
The reverse slope surface 51 of the above is slidably engaged at the same angle with the slope surfaces 31A and 31B of the rubber rings 3A and 3B attached to the front and rear substrates 1 and 2, respectively, so that the sliding cylinder is moved forward and backward by the rubber. It is converted into elastic deformation in the outer peripheral direction of the wheel, which is manifested, and finally the operation of the hydraulic jack appears as attachment / detachment of the rubber wheels 3A, 3B to the inner surface of the pipe.

In addition to the above, a water supply pipe 55 for supplying the test water from the rear and an inlet 56 for supplying the test water, an air vent 57 for smoothly advancing the water supply, and the like are appropriately provided to set the water pressure test so as to proceed efficiently. is doing.

[0014]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, regardless of the inner diameter of the pipe, the inspector does not sneak into the pipe, and the water pressure at the joint portion of the pipe is maintained regardless of the form of the pipe. The test can be carried out efficiently. Since all inspection work is carried out by remote control from outside the pipe, or from the vertical resistance in the middle of the pipe, the inspector does not need to work in a narrow pipe, and can concentrate on careful inspection, so that in terms of occupational safety, The effect of significantly improving the inspection reliability as compared with the conventional one is remarkable. There is no particular strict limitation on the type of pipe, and there is an advantage that it can be applied to standard pipes of several kinds of diameters in common if the length of the inclined surface is sufficient, which is not inferior to conventional ones.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

2 is a sectional view taken along the line AA (A), a sectional view taken along the line BB of FIG.
It is a CC cross section (C) and a right side view (D).

3 (A) and 3 (B) are front views for explaining the operation of the embodiment.

FIG. 4 is a vertical sectional front view showing a conventional technique.

FIG. 5 is a vertical sectional front view showing another conventional technique.

[Explanation of symbols]

 1 Front Substrate 2 Rear Substrate 3 Rubber Wheel 4 Front Sliding Cylinder 5 Front Sliding Cylinder 5 Rear Sliding Cylinder 6 Hydraulic Jack 7 Illumination 8 Monitor Camera 11 Wheel 12 Tension Bar 13 Nut 21 Wheel 31 Slope 41 Reverse Slope 51 Reverse Slope 52 Outer Cylinder 53 Inner cylinder 54 Rubber ring 55 Water supply pipe 56 Injection port 57 Air bleeding 61 Oil supply pipe 62 Sliding spacer P pipe (cast iron pipe) V Sealed space

Claims (2)

[Claims] 1. A front substrate 1 and a rear substrate 2, each of which is provided with wheels 11 and 21 which can travel in a pipe, and which are connected to each other in the pipe axial direction, and a front substrate 1 and a rear substrate 2, respectively. Rubber rings 3A, 3B whose sides are sloped surfaces 31A, 31B
And a front sliding cylinder 4 and a rear sliding cylinder 5 each having outwardly sloped surfaces 41 and 51 at the same angle as the sloped surfaces 31A and 31B of the rubber ring.
A hydraulic jack 6 which is supported between the front substrate 1 and the rear substrate 2 in a water-sealed state and moves the front sliding cylinder 4 and the rear sliding cylinder 5 in the axial direction, and driving means and detecting means for operation. A hydraulic tester for pipes, characterized by being equipped with. 2. The front substrate 1 according to claim 1, wherein the detection means is a front substrate 1.
A water pressure tester for pipes, which comprises an illumination 7 and a monitor camera 8 attached to the front of the pipe.