JP5709776B2 - Welded pipe shape measuring device - Google Patents

Description

  The present invention relates to a welded pipe shape measuring device for measuring the outer shape of a large-diameter pipe formed by welding plate materials molded by press working or the like.

In large-diameter pipes and elbows used in land boiler plants and the like, pipes and elbows in which plate materials molded by pressing or the like are combined by welding are generally used.
In the case of product inspection at a factory, or in the piping of existing land boilers and elbows, these pipes act on the pipe wall by the pressure of the fluid flowing inside the pipe. The acting stress of the pipe wall generated by the fluid pressure varies depending on the cross-sectional shape, and the progress of the durable life of the pipe changes.
From the viewpoint of pipe management, in order to perform non-destructive life prediction, it is effective to monitor bulging by measuring the outer diameter of the pipe and to perform simulation analysis by working stress using stress analysis.

Japanese Patent Laid-Open No. 6-185924 (Patent Document 1) is disclosed as an example of a dimension / shape measuring device for a steel pipe (pipe).
According to Patent Document 1, a distance detection signal provided with a distance detector provided facing the radial direction of the pipe, and continuously obtained in the circumferential direction of the pipe by rotating the pipe about the axis of the pipe; A technique is disclosed in which the diameter and roundness of an arbitrary position in the circumferential direction of a pipe can be measured by performing arithmetic processing on a signal obtained continuously from a sensor that detects the rotation angle of the pipe. .

JP-A-6-185924

  However, the disclosed technique of Patent Document 1 is a technique in which a steel pipe (pipe) is rotated around the axis of the pipe to calculate a signal from the distance sensor, and the measuring device cannot be easily moved. Yes, it is a device that cannot measure at the installation site such as a boiler plant by measuring the external shape of existing piping.

  The present invention was made in order to solve such problems. A measuring jig convenient for movement was manufactured, and the outer diameter shape of the manufactured piping, existing piping, or elbow was accurately and easily measured. An object is to provide an inexpensive and inexpensive device.

In order to solve this problem, the present invention is a welded pipe shape measuring device for measuring the outer diameter shape of a pipe to be measured by combining plate materials formed by pressing or the like by welding,
A ring member having an inner peripheral surface with a gap with respect to the outer peripheral surface of the pipe to be measured, and having an outer peripheral surface adjusted to a constant thickness with respect to the inner peripheral surface;
A plurality of measurement holes that are perforated along the normal direction at regular intervals on the entire circumference of the outer peripheral surface and at positions opposed to the center of the ring member;
A plurality of fixing member mounting holes which are drilled between the measurement holes along the normal direction at equal intervals in the circumferential direction of the outer peripheral surface, and fix the ring member to the pipe to be measured;
A plurality of fixing members that fit into the fixing member mounting holes and fix the ring member to the pipe to be measured;
A measuring instrument that is fitted into the measurement hole and measures the distance between the outer peripheral surface of the pipe to be measured and the inner peripheral surface of the ring member ,
The ring member is formed so that it can be divided into two along the circumferential direction, and a substantially rectangular groove is formed along the circumferential direction on the outer circumferential surface of the ring member, and the groove at the edge of the divided portion is formed. Both flanges have L-shaped connecting flanges fixed to the outside in the width direction,
Positioning knock pins and knock pin holes into which the knock pins are fitted are respectively formed on opposing surfaces of the connecting flange when connecting the divided ring members, and the connecting flange is attached to both end edges. In this state, each of the divided ring members has the same shape .

  According to this invention, by measuring the distance (normal direction) between the inner peripheral surface of the ring-shaped measuring device and the outer peripheral surface of the pipe to be measured, the outer diameter shape of the pipe to be measured can be accurately and easily obtained. It can be measured.

Further, the present invention, the ring member that is divided into two can be formed along the circumferential direction.

According to this invention, since the ring member is formed so as to be divided into two along the circumferential direction, the ring member can be externally fitted to the measured pipe without removing the existing measured pipe. Man-hours can be reduced and the operating efficiency of equipment using the pipe to be measured can be prevented from being reduced.
Further, since the ring members divided into two parts have the same shape with the connecting flange attached to both end edges, the manufacturing cost can be reduced.

Further, the present invention, the outer peripheral surface of the ring member, that is formed is substantially rectangular grooves along the circumferential direction.

  According to this invention, by making the outer peripheral surface of the ring member a concave groove structure, the rigidity of the portion is maintained, the roundness of the ring shape is ensured, and the movement can be facilitated by reducing the weight.

  In the present invention, it is preferable that a symbol indicating a measurement position be attached in the vicinity of the measurement hole.

  According to this invention, it is possible to prevent misidentification of the position when organizing the measurement results.

  In the present invention, it is preferable that the measurement hole is provided with a guide part for setting the measuring instrument to a specified position so that the measuring element of the measuring instrument moves along the normal direction.

  According to this invention, it is possible to easily perform high-precision measurement by preventing the movement direction of the probe from being shifted.

  Preferably, in the present invention, the measuring instrument is a dial gauge, and a support base for restricting a fitting allowance to the measurement hole is provided in a case in which a probe of the dial gauge advances and retreats. .

According to this invention, by determining the reference position for dial gauge measurement with the support base, it is possible to easily read the gap between the outer peripheral surface of the pipe to be measured and the inner peripheral surface of the ring.
In addition, the height of the support base can be replaced with the thickness of the inner peripheral surface and the outer peripheral surface of the ring member. In this case, the weight of the ring member increases, but the support base is arranged on the dial gauge side. As a result, the weight of the entire apparatus can be reduced and the cost can be reduced.

By adopting such a structure, by measuring the distance (normal direction) between the inner peripheral surface of the ring-shaped measuring device and the outer peripheral surface of the measured pipe, the outer diameter shape of the measured pipe can be accurately and Can be measured (calculated) easily.
Furthermore, by allowing the ring member to be divided into two in the circumferential direction, the ring member can be externally fitted to the pipe to be measured without removing the existing pipe to be measured. A decrease in the operating efficiency of the equipment being used can be minimized.

1 shows an overall schematic plan view according to an embodiment of the present invention. The AA arrow line view of FIG. 1 is shown. The A section enlarged view of FIG. 2 is shown, and a dial gauge mounting condition explanatory view is shown. The B section enlarged view of FIG. 2 is shown, and a piping and ring fixed condition figure is shown. The perspective view of the state which isolate | separated the ring connection part of the B section of FIG. 1 is shown. The perspective view of the dial gauge which concerns on this invention is shown.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

FIG. 1 is a plan view of a welded pipe shape measuring apparatus according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.
Reference numeral 1 denotes a ring which is a ring member. The ring 1 is fitted on the pipe 10 to be measured (hereinafter abbreviated as “pipe 10”) with a gap L1 (varies) and has a high roundness. A ring inner peripheral surface 1a formed with accuracy, a ring outer peripheral surface 1b whose thickness LT in the radial direction is adjusted to be constant with the ring inner peripheral surface 1a, and a further radius from both ends in the width direction of the ring outer peripheral surface 1b. Flange portions 1c and 1c extending outward in the direction are formed. A substantially rectangular recess 1g is formed by the ring outer peripheral surface 1b and the flange portions 1c, 1c.
This is intended to maintain rigidity as a measuring jig (measuring gauge mounting tool) and to reduce the weight and cost (material cost).

  A plurality of fixing screw holes 2 as fixing member mounting holes are provided along the circumferential direction of the ring 1 in the thickness LT portion of the ring inner peripheral surface 1a and the ring outer peripheral surface 1b. An inner screw is provided in the hole 2 along the normal direction. A fixing screw 9 as a fixing member is screwed into the fixing screw hole 2 so that the ring 1 and the pipe 10 are fixed. In the present embodiment, six fixing screw holes 2 are arranged at equal intervals over the entire circumference of the ring 1, but may be increased or decreased depending on circumstances.

In addition, the thickness LT of the ring inner peripheral surface 1a and the ring outer peripheral surface 1b is a measurement for measuring the gap dimension between the outer diameter of the pipe 10 and the ring inner peripheral surface 1a along the circumferential direction of the ring 1. A plurality of holes 3 are arranged along the normal direction.
An even number of measurement holes 3 are provided at equal intervals over the entire circumference of the ring 1, and each of the measurement holes 3 is disposed at a symmetrical position with respect to the center CL of the ring 1. In the present embodiment, 24 measurement holes 3 are provided, but can be increased or decreased in consideration of measurement accuracy.

And the code | symbol which shows the measurement position of each measurement hole 3 is attached | subjected to the outer surface of the flange part 1c. The code may be any number as long as it is identified by a numeral or alphabet as shown in FIG. In the case of this embodiment, it is a code in which numbers are arranged in a circle.
By attaching the reference numerals, it is easy to clarify the position collation between the pipe 10 side and the measured value, and accurate data can be obtained.
Further, the fixing screw hole 2 is provided in an intermediate portion between the adjacent measurement holes 3. This can provide a good effect in order to eliminate any influence (deformation of the ring 1) due to the reaction force when the ring 1 is fixed by the fixing screw 9.

In the present embodiment, as shown in FIG. 1, the ring 1 has a shape obtained by combining the upper and lower parts (in FIG. 1) of the ring connecting portion 5. It has become.
As shown in FIG. 5, the ring connecting portion 5 has an L-shaped connecting A flange 51 fixed (welded) to the outer side in the width direction of both flange portions 1c and 1c at the edge of the split portion of the A ring 11a.
The connection A flange 51 is fixed in such a shape that one side 51b of an L shape is welded to both flange portions 1c and 1c, and the other side 51a protrudes outward in the width direction from the flange portion 1c. On the other side 51a, a bolt 54 is provided via a positioning knock pin (press-fit) 53 protruding to the B ring 11b side, which will be described later, and a bolt hole provided in the connection B flange 52 fixed to the B ring 11b side. A screw hole (female screw) 51c to be screwed is provided.

On the other hand, the L-shaped connection B flange 52 is fixed to the position facing the connection A flange 51 (welding) on the outer side in the width direction of both flange portions 1c, 1c of the split portion edge of the B ring 11b facing the A ring 11a. Has been.
The connection B flange 52 is fixed in such a shape that one L-shaped portion 52b is welded to both flange portions 1c and the other 52a protrudes outward in the width direction from the flange portions 1c and 1c.
The other 52a has a knock pin hole 52d into which the knock pin 53 is inserted and a screw portion (male screw) of a bolt 54 that is screwed into the screw hole 51c (female screw) at a position facing the knock pin 53 on the other side 51a. A fastening hole 52c to be inserted is provided.
The knock pin 53 is used for easily assembling the positional relationship between the A ring 11a and the B ring 11b with high accuracy.
The A ring 11a and the B ring 11b have the same shape by attaching the connection B flange 52 to the other edge of the A ring 11a and attaching the connection A flange 51 to the other edge of the B ring 11b. Thus, the manufacturing cost can be reduced.

The assembly of the ring 1 is arranged so as to surround the pipe 10 with the A ring 11a and the B ring 11b, and the connection A flange 51 and the connection B flange 52 are corrected to face each other.
The knock pin 53 on the connection A flange 51 side is fitted into the knock pin hole 52d of the connection B flange 52, and the relative positional relationship between the A ring 11a and the B ring 11b is positioned as specified. Thereafter, the bolt 54 is inserted into the tightening hole 52c on the connection B flange 52 side and screwed into the screw hole 51c (female screw) of the connection A flange 51 to connect the A ring 11a and the B ring 11b. By doing so, the ring 1 is formed.
Thereafter, the ring 1 is fixed to the pipe 10 by tightening the fixing screws 9 screwed into the fixing screw holes 2 (six locations in the present embodiment).
However, when the fixing screw 9 is tightened, it may be adjusted while adjusting the gap L1 between the ring inner peripheral surface 1a of the ring 1 and the outer peripheral surface 10a of the pipe 10 to be substantially the same.
When the gap L1 is adjusted to be substantially the same, the range of the gap L1 value is narrowed, and the measurement values are easily arranged.

FIG. 3 is an enlarged view of a portion A in FIG. 2 and will be described based on a state in which the dial gauge 7 is attached to the portion.
FIG. 6 shows an external perspective view of the dial gauge 7 which is a measuring instrument. The dial gauge 7 is widely used.
A probe 73 is supported from the case main body 71 of the dial gauge 7 so as to be able to advance and retreat in the probe guide 71a. Reference numeral 72 denotes a dial portion for adjusting the scale of the dial gauge 7.
The support base 8 is fixed to the probe guide 71a with screws 81. The support base 8 acts as a stopper for keeping the insertion amount LG constant when the dial gauge 7 is inserted into each measurement hole 3 of the ring 1.
Further, a guide portion 1 e for allowing the measuring element 73 to advance and retreat in the normal direction of the ring 1 is formed at a portion where each measuring hole 3 is fitted with the measuring element guide 71 a.
The guide structure in this case reduces the fitting gap between the outer diameter of the probe guide 71a and the measurement hole 3 so that the axis of the probe 73 and the axis of the measurement hole 3 coincide with each other, The structure is such that the axis of the measuring element 73 is double-guided in the normal direction by the outer peripheral surface 1 b of the ring 1 and the joint surface of the support base 8.
Further, the height LH (normal direction) of the support base 8 is such that the protruding amount L3 of the tip 73a of the probe 73 protruding from the ring inner peripheral surface 1a toward the center of the ring 1 is slightly larger than the measurement range of the dial gauge 7. It is decided to become a lot. (Held constant)
At this time, the scale of the dial gauge 7 is adjusted to 0 (zero).
That is, it is determined by the height LH of the support base 8 and the radial thickness LT of the ring 1.

A method of outputting the measurement result will be described with reference to FIG.
The dial gauge 7 is inserted into the measurement hole 3 until the support base 8 contacts the outer peripheral surface 1b. The tip 73a of the probe 73 abuts on the outer peripheral surface 10a of the pipe 10, and moves backward within the probe guide 71a by the probe amount L2.
Since the protrusion amount L3 from the ring inner peripheral surface 1a is kept constant, the gap L1 between the ring inner peripheral surface 1a and the outer peripheral surface 10a of the pipe 10 becomes L3 = L3-L2.
This operation is performed for all the measurement holes 3.
The measurement hole 3 is an even-numbered element, and each measurement hole 3 is arranged with respect to the center CL of the ring 1. Accordingly, the outer diameter LP of the portion of the pipe 10 LP = LR− (L5 + L17) from the gap L1 (= L5 is changed for explanation) and the symmetrical position code L1 (= L17 is changed for explanation). ).
In this way, the amount of aging (expansion amount) of the pipe 10 can be obtained, and the life of the pipe can be estimated from this result by simulation analysis.
In this embodiment, a dial gauge is used as a measuring instrument. However, if the probe can be inserted in the normal direction of the ring through the measurement hole, the rear part of the micrometer type or the caliper is used. You can also measure using.

By adopting such a structure, the ring 1 can be divided in shape and the cross-sectional shape of the ring outer peripheral surface 1b is a rectangular recess 1g, so that it can be carried (moved) and handled by weight reduction. improves.
In addition, since it is possible to divide, it is possible to measure the piping with the piping installed in the existing land boiler plant to obtain the estimated data of the durable life of the piping (large diameter pipe), thereby shortening the measurement work. Can improve the operating rate of equipment and reduce costs by reducing man-hours.

  It can be provided as a welded pipe shape measuring device for measuring the outer shape of a large-diameter pipe formed by welding plate materials molded by pressing or the like.

1 Ring (ring member)
1a Ring inner peripheral surface (inner peripheral surface)
1b Ring outer peripheral surface (outer peripheral surface)
1c Flange part 1e Guide part 1g Groove (rectangular groove)
2 Fixing screw holes (fixing member mounting holes)
3 Measurement hole 5 Ring connection 7 Dial gauge (measuring instrument)
8 Support base 9 Fixing screw (fixing member)
10 Piping (Measuring piping)
11a A ring 11b B ring 51 Connecting flange A
52 Connecting flange B
73 Measuring element L1 Gap (distance between the outer peripheral surface of the pipe to be measured and the inner peripheral surface of the ring member)
L2 Probe L L3 Probe tip protrusion LP Pipe outer diameter LR Ring inner diameter

Claims (4)

A welded pipe shape measuring device for measuring the outer diameter shape of pipes to be measured by combining plate materials formed by pressing or the like by welding,
A ring member having an inner peripheral surface with a gap with respect to the outer peripheral surface of the pipe to be measured, and having an outer peripheral surface adjusted to a constant thickness with respect to the inner peripheral surface;
A plurality of measurement holes that are perforated along the normal direction at regular intervals on the entire circumference of the outer peripheral surface and at positions opposed to the center of the ring member;
A plurality of fixing member mounting holes which are drilled between the measurement holes along the normal direction at equal intervals in the circumferential direction of the outer peripheral surface, and fix the ring member to the pipe to be measured;
A plurality of fixing members that fit into the fixing member mounting holes and fix the ring member to the pipe to be measured;
A measuring instrument that is fitted into the measurement hole and measures the distance between the outer peripheral surface of the pipe to be measured and the inner peripheral surface of the ring member ,
The ring member is formed so that it can be divided into two along the circumferential direction, and a substantially rectangular groove is formed along the circumferential direction on the outer circumferential surface of the ring member, and the groove at the edge of the divided portion is formed. Both flanges have L-shaped connecting flanges fixed to the outside in the width direction,
Positioning knock pins and knock pin holes into which the knock pins are fitted are respectively formed on opposing surfaces of the connecting flange when connecting the divided ring members, and the connecting flange is attached to both end edges. In this state, the divided ring members have the same shape . The welded pipe shape measuring device according to claim 1 , wherein a sign indicating a measuring position is attached to the vicinity of the measuring hole. According to claim 1 or 2, characterized in that guide portion measuring element of the measuring instrument in the measuring hole is set to a defined position of the instrument to move along the normal direction is provided Welding pipe shape measuring device. The instrument is a dial gauge, according to claim 1 to 3, characterized in that support platform for regulating the fitting margin to the measuring hole in the case where the measuring element of the dial gauge is advanced and retracted is provided The welded pipe shape measuring device according to any one of the above.

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