JPH1137906A - Inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for inspecting a deformation capability under the press of a cylindrical body being used as the flexible part of a flexible tube. SOLUTION: An inspecting device 10 has a casing 14 that can accommodate a cylindrical body 12 and water 70 for applying pressure to the cylindrical body, and a movable member 16 being retained in the casing so that it can be linearly moved. The cylindrical body 12 is arranged in the movement direction of a movable member 16 or a direction that is at right angle to the movement direction, and is watertightly fixed at both end parts. The inspecting device, furthermore, includes means 18 and 19 for driving the movable member to deform the cylindrical body, means 20 and 21 for measuring force being required for the deformation of the cylindrical body, and a means 22 for detecting the degree of the deformation of the cylindrical body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus used for inspecting the deformability of a tubular body applied to a flexible portion of a flexible tube under pressure.

[0002]

2. Description of the Related Art When a pipeline installed in the ground receives an external force from the surrounding ground due to the action of an earthquake, a difference in the amount of displacement between the pipes constituting the pipeline occurs, and these connecting portions are damaged, Sediment and groundwater in the surrounding ground may flow into the pipeline from the damaged portion, thereby impairing the function as the pipeline. Therefore, in order to prevent damage to the pipeline during an earthquake, a part of the pipeline constituting the pipeline may be a flexible tubular body having a flexible tubular body, for example, a rubber tubular body. Proposed. According to this, it is considered that when displacement occurs between the pipes, the tubular body of the pipes is deformed, and this deformation avoids damage to the connecting portion between the pipes.

[0003] By the way, the flexible tube is placed underground
It receives the earth pressure of the surrounding ground and the water pressure by groundwater, and receives the external force of the earthquake under such pressurization. As for the cylindrical body constituting the flexible portion of the flexible tube, its material, structure, and the like are selected on the assumption that the flexible tube is used in such a situation. However, it is not guaranteed that the thus selected tubular body will deform as expected when subjected to an earthquake under pressure.

Therefore, it is desirable to know the behavior of the tubular body when receiving an external force under pressure. However, conventionally, there has been no apparatus for inspecting the deformability of the cylindrical body, which is a steel member of the flexible portion, in a state where the cylindrical body is pressed from the periphery thereof.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for inspecting the deformability of a cylindrical body used as a flexible portion of a flexible tube under pressure. Another object of the present invention is to provide an apparatus for inspecting watertightness when the cylindrical body is deformed under pressure.

[0006]

According to the present invention, there is provided an inspection apparatus for inspecting the deformability of a cylindrical body applied to a flexible portion of a flexible tube under pressure, according to the present invention. A casing capable of containing water for applying pressure to the body, and a movable member held in the casing so as to be capable of linear movement, wherein the cylindrical body is perpendicular to the direction of movement of the movable member. A casing and a movable member which are disposed in the casing so as to be fixed at both ends thereof in a watertight manner, driving means for driving the movable member to deform the tubular body, and the tubular body Measuring means for measuring the force required for deformation of the cylindrical body, and detecting means for detecting the degree of deformation of the cylindrical body.

Another inspection apparatus according to the present invention is a casing capable of storing the cylindrical body and water for applying pressure to the cylindrical body, and is held in the casing so as to be capable of linear movement. A movable member, wherein the cylindrical body is disposed in the casing so as to extend in the direction of movement of the movable member, and a casing and a movable member fixed at both ends thereof in a watertight manner; and Driving means for driving the movable member to deform, and measuring means for measuring the force required to deform the cylindrical body,
Detecting means for detecting the degree of deformation of the cylindrical body.

[0008] Still another inspection apparatus according to the present invention comprises a casing capable of accommodating the tubular body and water for applying pressure to the tubular body, and a first casing held in the casing and orthogonal to each other. A movable member which is selectively movable linearly in a direction and a second direction, wherein the tubular body is disposed in the casing so as to be perpendicular to the first direction, and both ends thereof , A casing and a movable member respectively fixed in a watertight manner, a first drive unit for driving the movable member in the first direction to deform the tubular body, and a first drive unit. First measuring means for measuring a force required to deform the cylindrical body, and second driving means for driving the movable member in the second direction to deform the cylindrical body. , By the second driving means. And a detection means for detecting a second measuring means for measuring the force required to deform the tubular member, the degree of deformation of the tubular body.

The casing of each inspection device has a hole that communicates with the inside of the tubular body when the tubular body is disposed inside the casing.

[0010]

According to the present invention, according to the present invention, the cylindrical body is fixed to the casing and the movable member at both ends thereof in a watertight manner, and the casing is filled with water. Under a predetermined water pressure. Further, since the cylindrical body is disposed in the casing so as to be perpendicular to the direction of movement of the movable member, the movable member is driven by the driving unit under a predetermined water pressure, and The tubular body can be deformed by applying a shearing force to the tubular body. The magnitude of the force required to deform the cylindrical body at this time can be measured by the measuring means, and the degree of deformation of the cylindrical body can be detected by the detecting means. As a result, the relationship between the amount of deformation of the tubular body under pressure and the external force can be known.

According to the present invention, the tubular body is disposed in the casing so as to extend in the direction of movement of the movable member, and the movable means is driven by the drive means under a predetermined water pressure. A tensile force or a compressive force is exerted on the cylindrical body to deform the cylindrical body in the axial direction. The magnitude of the force required to deform the cylindrical body at this time can be measured by the measuring means, and the degree of deformation of the cylindrical body can be detected by the detecting means. As a result, the relationship between the amount of deformation of the tubular body under pressure and the external force can be known.

Further, according to the present invention, the tubular body is arranged in the casing so as to be perpendicular to the first direction, and the first driving means operates under a predetermined water pressure. By driving the movable means, a force in the first direction, that is, a shearing force is exerted on the cylindrical body to deform the cylindrical body. The magnitude of the force required to deform the cylindrical body at this time can be measured by the first measuring means, and the degree of deformation of the cylindrical body can be detected by the detecting means. Further, the movable means is driven by the second driving means, and the second body is moved to the cylindrical body.
, I.e., an axial force to deform the cylindrical body in the axial direction. The magnitude of the force required to deform the cylindrical body at this time can be measured by the second measuring means, and the degree of deformation of the cylindrical body can be detected by the detecting means. As a result, the relationship between the amount of deformation of the tubular body under pressure and the external force can be known.

Further, according to the present invention, since the casing has a hole communicating with the cylindrical body when the cylindrical body is disposed therein, an inspector can clean the inside of the cylindrical body. You can see it. Therefore, when the cylindrical body is deformed, an inspector can check whether or not water leaks from the cylindrical body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, there is shown an inspection apparatus 10 according to the present invention and a flexible tubular body 12 to be inspected.

The tubular body 12 to be inspected includes a rubber body, a plurality of rubber rings and a steel ring which are alternately superimposed and bonded, and the like. Therefore, it is used to constitute a part (flexible portion) of a flexible tube (not shown) which is a kind of a tube buried in the ground. That is, the tubular body 12 constitutes the flexible tube in cooperation with a plurality of rigid portions made of concrete, steel, or the like, at least one of which is alternately arranged and joined in a watertight manner.

The inspection device 10 applies a water pressure around the cylindrical body 12 in order to inspect the deformability of the cylindrical body 12 provided for such use, and deforms the cylindrical body 12 under the water pressure. Having a structure for generating

More specifically, the inspection apparatus 10 includes a casing 14 capable of storing a tubular body 12 to be inspected and water for applying pressure to the tubular body 12, a movable member 16 disposed in the casing 14, A driving unit for driving the movable member 16, a measuring unit for measuring a force required to deform the cylindrical body 12, and a detecting unit 22 for detecting the degree of deformation of the cylindrical body 12. Is provided.

The inspection apparatus shown in FIG. 1 applies a driving means (first driving means) 18, which is a mechanism for applying a shearing force to the cylindrical body 12 to cause deformation, and applies an axial force to the cylindrical body 12. Driving means (second driving means) 19 as a mechanism for applying the force, measuring means (first measuring means) 20 and measuring means (second measuring means) 21 for measuring the force required for these deformations And both deformation imparting mechanisms and both measuring means are selectively activated. However, the inspection device for inspecting the deformability of the cylindrical body 12 may include one of the two deformation applying mechanisms and the two measuring means.

The casing 14 includes a cylindrical main body 24,
It has a pair of disc-shaped end plates 26 and 28 that are detachably and water-tightly fixed to both open ends of the main body, respectively, and are horizontally supported via four legs 30 attached to the main body 24. I have.

In the illustrated example, the main body 24 and the end plates 26, 2
A plurality of bolts and nuts 8 pass through a flange joint 32 provided at each open end of the main body 24, each end plate 26, 28, and a packing (not shown) disposed therebetween. It is integrated using an assembly 34.

The illustrated main body 24 is provided for the purpose described below.
It has a length dimension that can accommodate two cylindrical bodies 12 in series in the axial direction. The main body 24 is provided therein with a bottom plate 36 (see FIG. 5) and a top plate 38 which extend over the entire length of the main body 24. The space between these plates 36, 38 substantially occupies the space in the casing 14. Defined in Therefore, the movable member 16 includes the two plates 36,
38, the cylindrical body 12 and the water are accommodated between the plates 36, 38. In this example, the tubular body to be inspected is the tubular body 12 on one end plate 26 side.

One end plate 26 of the casing has a hole 40 provided at the center thereof. The hole 40 has a diameter smaller than the inner diameter of the tubular body 12.

The movable member 16 is formed of a flattened cylindrical body having an outer diameter larger than the outer diameter of the cylindrical body 12, and has one end face (the end face facing the end plate 26) at the center thereof. A hole 42 having a diameter smaller than the inner diameter of the body 12;
The other end face (the end face facing the end plate 28) is closed.

The movable member 16 is located at the center of the casing main body 24 in the axial direction, and is disposed so that both end faces thereof are opposed to the end plates 26 and 28, respectively, in a direction crossing the casing main body 24 (more in detail). Is the body 28
(A direction in which a horizontal straight line extends in a direction perpendicular to the axis of.).

In the inspection, when the deformation due to the application of the shearing force is caused, the pair of cylindrical members 12
6 are arranged in series on both sides (see FIG. 2 and FIG. 3), and when deformation due to the application of the axial force is obtained,
A single tubular body 12 is disposed between the movable member 16 and one end plate 26 (see FIG. 4).

Each of the pair of cylindrical bodies 12 arranged in series is arranged coaxially with the end plates 26, 28 at one end thereof, and is fixed to the end plates 26, 28 in a watertight manner. .
In addition, the other end of each tubular body 12 is coaxially arranged on the movable member 16 and is fixed in a watertight manner. At this time, as for the cylindrical body 12 on the end plate 26 side, one end thereof surrounds the hole 40 of the end plate, and the other end surrounds the hole 42 of one end face of the movable member 16.
0 and 42 communicate with the inside of the cylindrical body 12.

The single cylindrical body 12 whose deformation capability is to be inspected in the axial direction is the same as one of the pair of cylindrical bodies 12, that is, the hole 40 of the end plate 26 is provided at one end thereof. And is water-tightly fixed to the end plate 26, and at the other end is coaxially arranged with the hole 42 of the movable member and is water-tightly fixed to the movable member.

When the casing 14 is filled with water as a result of fixing the tubular body 12 in a watertight manner, water does not enter the tubular body 12 and the movable member 16,
Receives water pressure on its outer peripheral surface, and the cylindrical body 12 and the movable member 16 receive buoyancy.

Further, since the internal space of the cylindrical body 12 and the hole 40 of one end plate 26 communicate with each other, the hole 4 of the end plate 26
0, from the outside of the casing 14, the casing 1
It is possible to observe the inner surface of the cylindrical body 12 in the inside 4, thereby checking whether or not the cylindrical body 12 has leaked water. In addition, the code | symbol 43 is each end plate 26,28.
2 shows a plurality of ribs for reinforcing the.

The fixing of the ends of the tubular members 12 to the movable member 16 and the end plates 26 and 28 can be performed, for example, by passing through the end surfaces of the movable member 16 and the end plates 26 and 28, respectively. This can be done with a plurality of bolts 41 screwed into the end of the twelve. The work of fixing the tubular body 12 to the movable member 16 can be performed by inserting a hand into the inside of the hole 42 of the movable member 16. Each tubular body 12 and each end plate 26,
28, and between each tubular body 12 and the movable member 16, packings (not shown) for maintaining watertightness between them are arranged.

The movable member 16 also has a pair of opposed projections 44 and 46 projecting downward and upward respectively from the bottom and top of the cylindrical body forming its main body. Each of the protrusions 44 and 46 has a free end formed of a horizontal flat surface, and the movable member 16 is placed on the lower plate 36 with the free end of the lower protrusion 42 in contact with the lower plate 36. . In this mounted state, the axis of the movable member 16 is located below the axis of the main body 18 (see FIG. 5). For this reason,
The tubular member 12 fixed to the movable member 16 and the end plates 26, 28 of the casing is slightly bent. The movable member 16 floats by buoyancy when the casing 14 is filled with water. By this floating, the lower convex portion 44 separates from the bottom plate 36, and the free end of the convex portion 46 at the top comes into contact with the top plate 38. At this time, the movable member 16
Are aligned with the axis of the main body 24, and the bending of each tubular body 12 disappears (see FIG. 6).

The cylindrical body 12 disposed in the casing 14
The first driving means 18 for applying the shearing force to the power transmitting means comprises a pair of single-acting hydraulic jacks. Both hydraulic jacks are
The movable members 16 are arranged in opposite directions on a horizontal straight line orthogonal to the axis of the movable member 16. In both jacks, the cylinders 48 are inside the movable member 16 and are fixed to the movable member 16 in a watertight manner, and the rods 50 project from the respective cylinders 48 to the outside of the movable member 16.

Each rod 50 has a pair of force transmitting members 52 fixed at its distal end to the main body 24 of the casing.
And is disposed at the center in the axial direction of the main body 24,
The pair is in contact with a pair of force transmitting members 52 extending in the direction of the horizontal straight line across the main body 24 toward each other. The movable member 16 is held between these force transmitting members 52 via both hydraulic jacks.
In the floating state shown in (1), the axes of both hydraulic jacks and the axis of both force transmitting members 52 are located on substantially the same straight line. The movable member 16 can be moved in the direction of the horizontal straight line by simultaneously extending and contracting the hydraulic jacks. Due to the movement of the movable member 16, the cylindrical body 12 receives a shearing force, and the cylindrical body 12 is deformed.

In the illustrated example, each force transmitting member 52 includes a large diameter portion 54 and a small diameter portion 56 that are coaxially continuous, and the large diameter portion 54 has a flat surface 58. On the other hand, the rod 50 of each hydraulic jack has a tip portion 60 that is a part of a spherical surface. For this reason, the rod 50 and the force transmitting member 52 make point contact with each other. Because of this point contact, the force transmitting member 52
, And the axis of the hydraulic jack, even if there is a slight deviation, the same size as when these axes are on a common straight line using both force transmitting members 52 as a reaction force body. A force is exerted on the movable member 16.

Further, due to such point contact, the movable member 16 is held on the main body 24 of the casing so as to be linearly movable in the axial direction.

In the illustrated example, the two force transmitting members 5
2 are respectively disposed in a pair of hollow protrusions 62 provided on the main body 24 and facing each other.

Each projecting portion 62 is formed of a cylindrical body penetrating the side of the main body 24 and fixed to the main body in a watertight manner. Each cylindrical body has one end opening to the inside of the main body 24 and the other end provided with a hole 64 having a smaller diameter than the opening hole of the one end.

On the other hand, the tip 60 of the rod 56 of each hydraulic jack is within the open end of each protrusion 62. For this reason, the sliding range of the tip portion 60 of the rod with respect to the flat surface 58 of the large diameter portion of the force transmitting member is limited to the inside diameter of the tip portion 60.

The first measuring means 2 is connected to the other end of each projection 62.
0 is fixed and closes the hole 64 of the protrusion 62. With this closure, water leakage from the protrusion 62 is prevented. Further, the distal end portion of the small diameter portion 56 of the force transmitting member extends through the hole 64 of each projection 62 and is fixed to the first measuring means 20. Thereby, the load on each hydraulic jack, that is, the force exerted on the movable means 16 from each hydraulic jack is transmitted to the first measuring means 20 via each force transmitting member 52, and the magnitude of the force is measured by the first measuring means 20. Is detected.

The first measuring means 20 comprises, for example, a load cell as shown.

The cylindrical body 1 deformed by receiving the shearing force
The detecting means 22 for detecting the degree of deformation 2 is composed of a potentiometer type displacement transducer. This displacement converter has a main body 66 having a built-in potentiometer, and a wire 68 for detecting displacement extending from the main body, and the potentiometer converts displacement of the wire 68 into and out of the main body 66 into a voltage to detect a displacement. . In the illustrated example, the converter main body 66 is attached to one end surface of the movable member 16,
The tip of the wire 68 is fixed to one end plate 26 so that the wire and the axis of the tubular body 12 are parallel. The detecting means 52 may be another device or a measure for detecting the amount of displacement electrically or mechanically, instead of the converter.

Therefore, the degree of deformation of the cylindrical body 12, that is, the amount of deformation can be known by reading the output value of the converter.

The linear movement of the movable member 16 for causing the cylindrical body 12 to deform is performed in water. That is, after the casing 14 is filled with the water 70, the first drive unit 18 is operated. Thereby, the cylindrical body 12 is deformed under water pressure. The water 70 can be pumped by operating a pump 71 connected to the main body 24 of the casing 14. Further, the magnitude of the water pressure to be exerted on the cylindrical body 12 can be changed by changing the amount of water supplied by the pump 71.

In the illustrated example, since two cylindrical bodies 12 are symmetrically arranged on both sides of the cylindrical body 12, each cylindrical body 12 generated when the shearing force is applied is directed toward the movable member 16. The horizontal forces acting on each other are offset. This allows
The linear motion of the movable member 16 excluding the influence of the horizontal force can be ensured. In addition, since the tubular body 12 is in a floating state in water under buoyancy, the influence of gravity and the frictional force, which are factors that cause a large error in the measured value of the shearing force, are substantially eliminated. Shear force can be exerted on body 12.

Next, referring to FIG. 4, the second driving means 1
9 and the second measuring means 21 will be described.

The second drive means 19 comprises a single double-acting hydraulic jack. This hydraulic jack is a casing 1
4 through the center of the other end plate 28 and the casing 1
The cylinder 72 is fixed to the end plate 28 in a water-tight manner and extends along the axis 4 and a rod 74 extends from the cylinder 72 into the casing 14. The rod 74 has a tip portion 76 which is a part of a spherical surface, like the rod 50 in the first driving means.

The second measuring means 21 comprises a load cell as in the first measuring means 20. The load cell is fixed to the center of the other end surface of the movable member 16.

The load cell serving as the second measuring means 21 has a force transmitting member 78 similar to the force transmitting member 52 described above.
Is fixed, and extends on the axis of the movable member 16 toward the end plate 28. The force transmitting member 78 is fixed to the load cell at the small diameter portion 80, and the flat surface 84 of the large diameter portion 82 is in contact with the tip portion 76 of the rod of the hydraulic jack.

The vicinity of the rod tip 76 and the force transmitting member 7
Flange joints 86 and 88 orthogonal to these axes are fixed to the small diameter portion 80 of FIG. Using a plurality of bolt and nut assemblies 90, the flanges 86, 8
By interconnecting the rods 8, the rod 74 and the force transmission member 78 can be interconnected. Thus, when the hydraulic jack serving as the second measuring means 21 is operated, a pressing force or a tensile force is applied to the movable member 16, and the movable member 16 can be linearly moved in the axial direction of the casing 14. At this time, the distal end portion 60 of the rod of the first driving means 18 slides on the flat surface 60 of each force transmitting member 52 in the axial direction.

FIG. 4 shows that a tensile force is applied to the movable member 16.
The state which deformed the cylindrical body 12 in the axial direction is shown. Prior to the application of the tensile force, the amount of advance of the rod 50 from the cylinder 48 of each of the hydraulic jacks fixed to the movable member 16 is set to be substantially the same, thereby moving the movable member 16 to the diameter of the main body 24 of the casing. It is located approximately at the center in the direction. Thereby, when the casing 14 is filled with the water 70 and the movable member 16 floats, both the axis of the tubular body 12 and the axis of the movable member 16 are substantially located on the axis of the casing 14.

By moving the movable member 16 in the axial direction in the water, the cylindrical body 12 can be deformed by tension. The degree of the deformation at this time can be detected by the detecting means 22. The rod 74 of the driving means 19
Is moved in the opposite direction, that is, to the left in the figure, the deformation of the cylindrical body 12 due to compression can be caused. The degree of deformation at this time can be detected by the detecting means 22.

Needless to say, as shown in FIGS. 2 and 3, when the cylindrical body 12 is deformed by the application of the above-mentioned shearing force, the two flange joints 86, 88 by the bolt / nut assembly 90 are used. Do this after breaking the interconnect.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view showing a part of an inspection device according to the present invention for inspecting the deformability of a flexible tubular body under pressure.

FIG. 2 is a cross-sectional plan view of the inspection device according to the present invention.

FIG. 3 is a cross-sectional plan view of the inspection device, showing a state where a shearing force is applied to the cylindrical body to deform the cylindrical body.

FIG. 4 is a cross-sectional plan view of the inspection device, showing a state where a tensile force is applied to the cylindrical body to deform the cylindrical body.

FIG. 5 is a conceptual sectional view showing a relationship between the casing and the movable member when no water is stored in the casing.

FIG. 6 is a conceptual sectional view showing a relationship between the casing and the movable member when the inside of the casing is filled with water.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inspection apparatus 12 Cylindrical body 14 Casing 16 Movable member 18, 19 First and second drive means 20, 21, First and second measurement means 22 Detection means

Claims (4)

[Claims] An apparatus for inspecting the deformability of a tubular body applied to said flexible portion of a tube having a flexible portion under pressure, wherein said tubular body and said tubular body are pressurized. And a movable member held in the casing so as to be capable of linear movement,
A casing and a movable member which are arranged in the casing so that the tubular body is perpendicular to the direction of movement of the movable member, and are fixed at both ends thereof in a watertight manner; and to deform the tubular body. An inspection including a driving unit for driving the movable member, a measuring unit for measuring a force required for deformation of the cylindrical body, and a detecting unit for detecting a degree of deformation of the cylindrical body. apparatus. 2. An apparatus for examining the deformability of a tubular body applied to said flexible portion of a tube having a flexible portion under pressure, wherein said tubular body and said tubular body are pressurized. And a movable member held in the casing so as to be capable of linear movement,
A casing and a movable member which are arranged in the casing so that the tubular body extends in the movement direction of the movable member and are fixed at both ends thereof in a watertight manner, and the movable member for deforming the tubular body. An inspection apparatus comprising: driving means for driving; measuring means for measuring a force required for deforming the cylindrical body; and detecting means for detecting a degree of deformation of the cylindrical body. 3. An apparatus for inspecting the deformability of a tubular body applied to said flexible portion of a tube having a flexible portion under pressure, wherein said tubular body and said tubular body are pressurized. And a first direction and a second direction which are held in the casing and which are orthogonal to each other and which can accommodate water for imparting
A movable member that can be selectively linearly moved in a direction, wherein the tubular body is disposed in the casing so as to form a right angle with respect to the first direction, and water-tightly fixed at both ends thereof. A casing and a movable member, and first driving means for driving the movable member in the first direction to deform the tubular body;
A first measuring means for measuring a force required to deform the cylindrical body by the driving means, and a second measuring means for driving the movable member in the second direction to deform the cylindrical body. Driving means, a second measuring means for measuring a force required for deformation of the cylindrical body by the second driving means, and a detecting means for detecting a degree of deformation of the cylindrical body. Inspection equipment, including. 4. The inspection device according to claim 1, wherein the casing has a hole communicating with the inside of the tubular body when the tubular body is disposed inside the casing.