JPH0735501A - Steel pipe end face perpendicularity measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] A steel pipe end face perpendicularity measuring device that can always measure the end face squareness of a steel pipe from the front regardless of the measurement position, and can clearly determine the flatness of the pipe. To provide. [Structure] The pipe end face perpendicularity measurement gauge main body is composed of a measurement terminal having a measurement terminal bar, a digital display dial gauge, a measurement terminal pressing piece, and a fixed magnet having a main body support. Fix it with a fixed magnet at a position opposite to the pipe end face that is the object to be measured, move the measurement terminal to the pipe end face and contact it, display the movement amount on the digital display dial gauge, and measure the movement amount at multiple points. An end face perpendicularity measuring device for steel pipes that can measure angles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe end face perpendicularity measuring device.

[0002]

2. Description of the Related Art In recent years, a platform structure capable of withstanding long-term use even under the severe environment associated with the development of deep-sea ocean oil fields is required. TLP (Tension Leg Pl
atform) is adopted. The steel pipe used for this TLP must be constructed by continuously welding in an oil field reaching a water depth of 200 to 2000 m. In this construction, steel pipes are welded to each other continuously, but for that purpose, it is necessary that the steel pipes to be continuously welded have the same diameter and the steel pipe ends are smooth. Requires accurate measurement method. In particular, in order to measure the smoothness of the steel pipe end, the end face perpendicularity gauge as a conventional measuring method is actually measured by using a micrometer or the like having only one face.

[0003]

However, since the above-described measuring method using the micrometer is composed of the measuring gauge which is seen only on one side, in the case of downward measurement, the value of the measuring instrument must be viewed from below. There is a problem that it is extremely difficult to see. Corresponding to these problems, the object of the present invention is to directly observe the end face perpendicularity of the steel pipe from the front regardless of the measurement position, and to determine the flatness of the pipe clearly. An object is to provide an angle measuring device.

[0004]

SUMMARY OF THE INVENTION The gist of the invention is that a pipe end face perpendicularity measuring gauge main body is fixed with a measuring terminal having a measuring terminal bar, a digital display dial gauge, a measuring terminal pressing piece and a main body support. The pipe end face perpendicularity measuring gauge body is composed of a magnet, and is fixed to a position opposite to the pipe end face as the object to be measured by a fixed magnet, and the measuring terminal is moved in contact with the pipe end face, and the moving amount is digitally displayed. The steel pipe end face perpendicularity measuring device is characterized in that the end face angle can be measured by measuring the amount of movement at a plurality of points.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall view of an apparatus for measuring an end face perpendicularity of a steel pipe according to the present invention. As shown in FIG. 1, a measuring terminal bar 3 having a measuring terminal 2 is provided in the end face perpendicularity measuring gauge body 1, and a spring 4 is provided at the tip of the measuring terminal bar 3 so that the measuring terminal pressing piece 5 has an arrow. When pushed from the direction, the measurement terminal bar 3 is configured to elastically move forward and backward.

[0006]

According to this structure, the fixed magnet 6 attached to the pipe end face perpendicularity measuring gauge body is fixed to, for example, a chamfering device (not shown) for the end face of the steel pipe, and the circumference of the end face of the steel pipe is fixed. Move the measuring terminal pressing piece in the direction of the arrow along
When the measuring terminal 2 is brought into contact with the end face of the steel pipe, the amount of movement of the measuring terminal pressing piece at the time of contact is transmitted to the digital display dial 7 via the tracing stylus bar 8, and the position of the end face of the steel pipe is measured at that position. It FIG. 2 is A-A of FIG.
FIG. Reference numeral 9 is a main body supporting tool for supporting the main body of the perpendicularity measuring pipe end face. The main body support tool 9 is formed integrally with the fixed magnet 6.

[0007]

[Examples] When measuring the squareness of the end face of a steel pipe, first, after processing the end face of the steel pipe, a marking line is inserted on the end face at a position 100 mm from the weld bead edge. Next, 90 degrees from the reference position in the circumferential direction.
Write at the positions of °, 180 ° and 270 °. The end face perpendicularity measurement gauge main body is chamfered with a fixed magnet between the chamfering devices where the end face perpendicularity measurement gauge main body is arranged facing the steel pipe end face so that the measuring parts come to the four positions. Stick to the device. And the gap between the measuring terminal and the steel pipe end surface is 6m.
Set with m as a reference, and press the dial gauge at that time to 0 to set the display to 0.00. From that state, at the position where the position of the outer peripheral end surface of the steel pipe was moved by 90 ° in the circumferential direction from the writing position, which is a 4-division position, push the measuring terminal piece from the fixed magnet side to move the measuring terminal to the steel pipe end surface from the measuring terminal bar. Contact. Read and record the digital display dial gauge display value at that time.

Next, the steel pipe is rotated by 180 ° and the same measurement is performed. From the difference between the facing positions, the following squareness equation shown in FIG. 3, squareness = [(a−c ′) − (c−a ′) / 2] = [(+
0.5)-(-0.5)-{(-0.5)-(+ 0.
5)} / 2] = 1.0 (mm) is calculated. For example, the steel pipe end face angle is read as a digital indicator display value ± 0.5 mm as shown in FIG. Then the squareness is 1.0
Since it is mm and the standard spec is 1.5 mm or less, it is determined that the circularity is substantially round. Thus, regardless of the measurement position of the end face angle of the steel pipe, the digital display dial gauge installed at the front can always be easily viewed, and the angle state can be clearly determined in a short time.

[0009]

As described above, in the conventional case, it is necessary to observe from the lower surface depending on the measuring position, even though the end face angle of the steel pipe is measured under a narrow environmental condition and the measuring position is changed. On the other hand, the present invention makes it possible to always observe and measure from the front position regardless of the measurement position,
Moreover, it is an excellent end face angle measuring device for steel pipes that can measure accurately.

[Brief description of drawings]

FIG. 1 is an overall view of an end face perpendicularity measuring device for steel pipes according to the present invention,

2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing one measurement value when the device of the present invention is used.

[Explanation of symbols]

 1 End face perpendicularity measuring gauge main body 2 Measuring terminal 3 Measuring terminal bar 4 Spring 5 Measuring terminal pressing piece 6 Fixed magnet 7 Digital display dial 8 Measuring element bar 9 Main body support

Claims (1)

[Claims] 1. A pipe end face perpendicularity measuring gauge main body comprises a measuring terminal having a measuring terminal bar, a digital display dial gauge, a measuring terminal pressing piece, and a fixed magnet having a main body supporting member. Is fixed by a fixed magnet at a position opposite to the pipe end face which is the object to be measured, and the measurement terminal is moved into contact with the pipe end face,
The amount of movement is displayed on the digital display dial gauge,
An end face perpendicularity measuring device for a steel pipe, wherein an end face angle can be measured by measuring a moving amount at a plurality of points.