JPH0712907U - Simple inner diameter measuring device for steel pipes - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a simple inner diameter measuring device for steel pipes that can measure the inner diameter of steel pipes extremely easily, with high precision and in a short time, and in which the deformed state of the pipe can be clearly identified. To do. [Constitution] The inner diameter measuring main body frame is composed of a radial frame and a horizontal frame. The inner diameter measuring main body frame is configured to be rotatable by a rotary shaft having a connecting bar and a bearing extending over the radial frame which constitutes the main body frame, and one end of the radial frame. A simple inner diameter measuring device for steel pipes, in which the apparent diameter of the body frame can be expanded or contracted by gripping the open lever and the close lever, which are loosely attached to the other end and connected to the measuring piece by a rope. [Effect] The present invention is a simple inner diameter measuring device for a steel pipe, which makes it possible to measure the inner diameter of the steel pipe with extremely high precision in a short time with a simple device, and which allows the deformation state of the pipe to be clearly identified.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a simple inner diameter measuring device for steel pipes.

[0002]

[Prior art]

 In recent years, due to the development of deep water offshore oil fields, a platform structure capable of withstanding long-term use is required even in the severe environment, and TLP (Tension Leg Platform) effective as this deep water platform is adopted. . The steel pipe used for this TLP must be constructed by continuous 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 to have an accurate measuring method because the steel pipes to be continuously welded have the same diameter. There is. Therefore, the conventional method of measuring the inner diameter of a steel pipe is to measure the inner circumference of the steel pipe manually by using a measuring tape, a caliper, and a micrometer.

That is, FIG. 5 is a view showing a conventional micrometer for measuring the inner diameter of a steel pipe. FIG. 5 (A) is a sectional view in the length direction of the steel pipe, and FIG. 5 (B) is a side view. As shown in FIG. 5 (A), the annular body 14 is provided with a scale 15 composed of four screw bodies, and the inner diameter when the scale 15 is brought into contact with the inside of the steel pipe 12 is measured by the micrometer 16. To do. In this way, the four points are brought into contact with each other, further rotated by 45 °, the position of the steel pipe is shifted, and the inner diameters of the total of eight points of the four points are measured. In this way, the circular body 14 is manually inserted from the end of the steel pipe 12 and the screws are turned until the scales 15 come into contact with the inner surface of the steel pipe, and the inner diameter is measured at the time of contact. Reference numeral 17 is a bead portion.

[0004]

[Problems to be solved by the device]

 However, the measuring method using the measuring tape described above has a problem in accuracy. In addition, the measuring method using a caliper or a micrometer as shown in Fig. 5 is difficult for the general public who does not have a profession in measuring, because the measuring method such as a caliper or a micrometer is difficult to measure, and a troublesome experience is required. However, there is a problem that the deformation state of the steel pipe is unknown. In order to solve these problems, the purpose of the present invention is to make it possible to measure the inner diameter of a steel pipe extremely easily with high accuracy and in a short time, and moreover, to clarify the deformed state of the pipe. It is to provide a measuring device.

[0005]

[Means for Solving the Problems]

 The gist of the invention is that the inner diameter measuring main body frame is composed of a radial frame and a horizontal frame, and is configured to be rotatable by a rotary shaft having a measuring piece, a connecting bar and a bearing on the radial frame constituting the main body frame. At the same time, one end of the steel pipe is loosely attached to the radial frame and the other end is connected to the measuring piece by a rope, and the diameter of the main body frame can be expanded or reduced by gripping the open and close levers. It is in the dimension measuring device.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall view of an inner diameter measuring apparatus according to the present invention. As shown in FIG. 1, the main body frame 1 is composed of eight radial frames 2 and a horizontal frame 3 forming the same number of octagons. The measuring piece 4 attached to the radial frame 2 has a connecting bar 5 The open lever 6 has one end loosely attached to the radial frame 2 and the other end connected to the measuring piece 4 by the rope 8. Similarly, the closing lever 7 is also measured by the radial frame 2 and the rope 8. It is connected to the fixed piece 4.

FIG. 2 is a cross-sectional view of a connecting portion of a body frame and a connecting bar according to the present invention. As shown in FIG. 2, the measuring piece 4 is integrally formed on the radial frame 2 via the measuring piece 4, the connecting bar 5 and the rotating shaft 10 having the bearing 9, and the measuring piece 4 is rotatable by the rotating shaft. Is configured. FIG. 3 is a perspective view of a connecting portion according to the present invention. The measuring frame 4 is connected to the radial frame 2, the horizontal frame 3 forming an octagon, and the connecting bar 5, and the rotary shaft 10 is integrally connected to the radial frame 2 via a holding plate 18. Further, the position of the measuring piece 4 can be adjusted by the elongated hole 11 provided in the holding plate 18, and the measuring piece 4 can be set to a predetermined size in advance. The radial frame is composed of a rectangular hollow body to reduce the weight.

With such a structure, when the closing lever 7 is first grasped together with the radial frame 2, the rope 8 is pulled, the measuring piece 4 connected thereto is rotated counterclockwise, and further the connecting bar is 5 operates in series so that each measuring piece rotates counterclockwise, and each measuring piece tilts in the direction in which it lies down, so that the outer diameter of the measuring device is apparently reduced. On the contrary, when the opening lever 6 is integrally gripped with the radial frame 2, the ropes 8 are stretched in the same manner as described above, the respective measurement pieces 4 rotate clockwise, and the measurement pieces are tilted in the rising direction. The diameter is apparently large.

[0009]

[Action]

 The inner diameter positioning operation using the body frame according to the present invention will be described in detail below. FIG. 4 is a view showing a state in which the main body frame according to the present invention is inserted into the inner surface of the steel pipe and positioned inside. First, the closing lever 7 is grasped and inserted into the steel pipe 12 in a state where the apparent diameter of the main body frame 1 is reduced, and the collar 13 is pressed against the end face of the steel pipe. Next, the open lever 6 is gripped, and the measuring piece 4 comes into contact with the steel pipe surface in the state where the main body frame is expanded, contrary to the above-mentioned closing lever. In that state, first, the gap of each piece is inspected using a 1 mm gap gauge. Then, using a 2 mm gap gauge, similarly inspect the gap of each piece. As a result, according to the jack-up necessity judgment standard, MAX and the symbol of the need for jack-up are directly written on the steel pipe at the maximum gap. Also, write MIN at the position where the bridge is in contact with the steel pipe. In this way, the straightening amount of the steel pipe can be measured with a simple device.

[0010]

【Example】

 When measuring the inner diameter of the steel pipe, hold the closing lever of the inner diameter measuring body frame, set it to the steel pipe measuring position with the diameter of the main body frame reduced, and press the three flanges onto the end, first from the welding bead edge. Insert a writing line on the outer surface of the 100 mm position. Insert the inner diameter measuring main body frame into the steel pipe so that the measuring part comes to the writing position. After that, the opening lever is grasped, the diameter of the main body frame is enlarged, the measuring piece is brought into contact with the steel pipe surface, and then the gap of each piece is inspected using each gap gauge of 1 mm and 2 mm. As a result, the jack-up necessity judgment criteria are followed. If the total diameter gap is 2 mm or less, a jack-up unnecessary symbol is directly entered on the steel pipe as a criterion for determining whether jack-up is required. In addition, when the measurement pieces (diameters) facing each other with a 1 mm gap gauge pass through each other, or with one end piece, there is a gap that does not pass at one end, and when there is more than 2 mm at both ends, use a 2 mm gap gauge. Then, when passing with one end piece, each needs to be jacked up. In this way, the necessity of jacking up is determined. Next, jack-up positioning and straightening amount measurement are performed using a caliper. The jack-up is performed by using a caliper, but the above-mentioned MAX and MIN positions are measured with a caliper although there is a clearance of 2 mm or more in diameter required.

When the brush strokes (MAX) and (MIN) do not intersect at 45 ° and 90 ° (when they are adjacent to each other) (MAX) may have the maximum diameter near the weld bead, This part is also measured and the larger part is defined as (MAX). The diameter intersecting with the diameter at the (MAX) position at 90 ° is (MIN). The correction amount in this case is displayed as-. Then, determine the jack-up amount for a straightening amount of 2.1 mm or more. In this way, it is possible to very easily determine whether or not the jack-up is necessary by using the simple inner diameter positioning measuring device according to the present invention, and after the determination, use a caliper or the like. The amount of correction can be easily measured. As a result, the inner diameter of the steel pipe can be measured with high accuracy and in a short time by a simple method, and the deformation state of the pipe can be clearly identified.

[0012]

[Effect of device]

 As described above, according to the present invention, the inner diameter of a steel pipe can be measured with a simple device with extremely high accuracy in a short time, and the state of deformation of the pipe can be clearly identified. It is in a simple inner diameter measuring device.

[Brief description of drawings]

FIG. 1 is an overall view of an inner diameter dimension measuring device according to the present invention,

FIG. 2 is a sectional view of a connecting portion of a body frame and a connecting bar according to the present invention;

FIG. 3 is a perspective view of a connecting portion according to the present invention;

FIG. 4 is a view showing a state in which a main body frame according to the present invention is inserted into an inner surface of a steel pipe and positioned inside thereof;

FIG. 5 is a view showing a conventional micrometer for measuring the inner diameter of a steel pipe.

[Explanation of symbols] 1 main body frame 2 radial frame 3 horizontal frame 4 measuring piece 5 connecting bar 6 open lever 7 close lever 8 rope 9 bearing 10 rotating shaft 11 long hole 12 steel pipe 13 collar 14 annular body 15 scale 16 micrometer 17 beads Part 18 Suppression plate

Claims (1)

[Scope of utility model registration request] 1. An inner diameter measuring main body frame is composed of a radial frame and a horizontal frame. The radial frame constituting the main body frame is configured to be rotatable by a rotary shaft having a measuring piece, a connecting bar and a bearing, and one end of which is rotatable. Simplified inner diameter measuring device for steel pipe characterized in that the apparent diameter of the main body frame can be expanded and contracted by gripping the open lever and the close lever, which are loosely attached to the radial frame and the other end is connected to the measuring piece by a rope. .