JP6824322B2 - How to check the member mounting position - Google Patents

Description

The present invention relates to a method for confirming a member mounting position in a welded structure.

Conventionally, in order to confirm whether or not a member has been attached to a predetermined position of a particularly large welded structure as designed, the actual size has been measured with a measuring instrument such as a measure.

On the other hand, for example, as in Patent Document 1, there is known a three-dimensional shape / position quality evaluation method for evaluating the three-dimensional shape / position quality of an evaluation object. This method has a data input process, a feature extraction process, and a quality evaluation process, and quality evaluation is performed on the evaluation object from the measured measurement data after coordinate conversion in which alignment is performed and the CAD data of the evaluation object. I try to do.

JP-A-2009-264965

The method as in Patent Document 1 is performed for quality evaluation of small products, and does not include quality evaluation of large welded structures such as bridge girders.

On the other hand, when measuring a large welded structure with a tape measure or the like, it is difficult to measure by one person, it is necessary to measure by a plurality of people, and it takes a very long time. For this reason, it is not realistic to check everything within the limited time in the process, and leakage may occur.

After the product is completed by main welding with the mounting position of the mounting member shifted, if a problem such as interference of the mounting member occurs when assembling at the site, the work must be stopped and the mounting member must be remounted. Problems occur.

The present invention has been made in view of this point, and an object of the present invention is to enable a small number of people to easily and surely confirm whether or not a component is installed in a correct position.

In order to achieve the above object, the first invention covers a method of confirming a member mounting position for confirming a mounting position of a mounting member in a welded structure.

And the above confirmation method is
A design shape storage process that stores the three-dimensional design shape of the welded structure in a storage device in advance,
The welded structure mounting process for mounting the welded structure before the main welding to which the mounting member is attached, and
The measuring instrument placement process of arranging the three-dimensional shape measuring instrument at a position where the shape of the welded structure can be imaged,
The three-dimensional shape measurement process of measuring and transmitting the shape of the welded structure using the three-dimensional shape measuring instrument, and
Differences in which the three-dimensional measurement shape measured by the three-dimensional shape measuring instrument by a computer is compared with the three-dimensional design shape stored in advance, and the presence or absence of a difference in the mounting position in the plate thickness direction of the mounting member is extracted. Extraction process and
The difference specification step of visually indicating the mounting member whose difference has been extracted by the above computer on the display unit, and
Among the differences specified on the display unit, the mounting position correction presence / absence determination process for determining whether or not the mounting position of the mounting member needs to be changed, and
The configuration includes a mounting position correction execution step of remounting the mounting member for which it is determined that the mounting position needs to be changed to the same correct position as the above three-dimensional design shape.

According to the above configuration, by using a three-dimensional shape measuring instrument that can measure even a large welded structure, even one person can easily measure the outer shape of the welded structure. Then, by comparing and clarifying the three-dimensional design shape memorized in advance and the actually measured three-dimensional measurement shape, it is more accurate with a smaller number of people than the conventional measurement with a measure by multiple people. The mounting position can be confirmed quickly. Then, by correcting the mounting position when the mounting position is different, it is possible to prevent the process from proceeding to the subsequent process as it is. In addition, "main welding" refers to welding performed to satisfy the necessary conditions as a product such as welding strength, as opposed to welding for mounting mounting members (also referred to as temporary welding, temporary welding, and assembly welding). Say.

In the second invention, in the first invention,
The three-dimensional design shape is a shape that takes into consideration the bending due to its own weight before the main welding of the mounting member and the shrinkage allowance due to welding.

The final finished product shape is the finished shape after welding, and the mounting position of the mounting member is confirmed in the temporarily fixed state before the main welding, and in reality, the mounting member If the shape is not designed in consideration of its own weight and shrinkage during welding, differences in mounting positions will be detected in many parts. However, according to the above configuration, the three-dimensional design shape is a shape that takes into consideration the deflection due to its own weight before the main welding of the mounting member and the shrinkage allowance due to welding, so that it is more accurate and more accurate by comparing with the three-dimensional measurement shape. It is possible to reliably extract mistakes in the mounting position of the mounting member.

In the third invention, in the first or second invention,
The welded structure is a plate girder block that forms part of the bridge girder.
The mounting member is a steel plate before main welding positioned on the plate girder block.

The plate girder block is generally a large welded structure, and it is very difficult and time-consuming to confirm the mounting position of the mounting member by actual measurement with a measure or the like, but according to the above configuration, mounting is easy and reliable. It is possible to extract mistakes in the mounting position of members.

In the fourth invention, in the third invention,
The welded structure is a large welded structure having a length of 10 m or more.

Especially for large welded structures of 10 m or more, the final product after the welding process is transported to the site and assembled at the site. Therefore, if there is a mistake in the mounting position, the work is interrupted and the mounting position is corrected. It has to be done, and it has a great influence on the whole work process. However, according to the above configuration, it is possible to easily and surely extract an error in the mounting position of the mounting member, so that the mounting position can be corrected on site. Be prevented.

As described above, according to the present invention, it is possible to easily and surely confirm whether or not the parts are mounted in the correct positions with a small number of people.

It is a perspective view for demonstrating the method of confirming the member mounting position which concerns on embodiment of this invention. It is a perspective view which shows a part of the plate girder block enlarged. (A) shows the NC ruled instruction figure, (b) shows the correct mounting position, and (c) shows the wrong mounting position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a method for confirming a member mounting position according to an embodiment of the present invention, in which, for example, a steel plate as a mounting member (for example, a vertical stiffener 3 and a horizontal stiffener 3) in a plate girder block 1 as a welded structure is used. This is a method of confirming the mounting position of the rigid material 4).

This plate girder block 1 is a large welded structure having a length of 10 m or more, and as shown in an enlarged view in FIG. 2, a vertical stiffener 3 and a horizontal stiffener 4 are predetermined on the I-shaped plate girder body 2. Welded in position. In the following description, confirmation of the mounting position of the vertical stiffener 3 or the horizontal stiffener 4 will be described, but the present invention is not limited to this.

The manufacturing process of the plate girder block 1 is as follows: (1) assembly of the plate girder body 2, (2) welding of the plate girder body 2, (3) assembly of the vertical stiffener 3 and the horizontal stiffener 4, and (4) vertical stiffener. The procedure is as follows: welding 3 and the horizontal stiffener 4 and (5) strain correction.

This confirmation method is performed after the assembling step of the vertical stiffener 3 and the horizontal stiffener 4 in (3). In the assembly process of the vertical stiffener 3 and the horizontal stiffener 4 of (3), only temporary welding is performed, and so-called main welding is not performed.

Conventionally, confirmation of this mounting position has required a large number of people to measure using a tape measure or the like, and it takes a very long time. For this reason, it is not realistic to check everything within the limited time in the process, and it was possible to confirm the presence or absence of mounting, but all the deviations in the mounting position of the plate thickness are all. It was difficult to do with the mounting members of.

As shown in FIG. 3A, a ruled writing instruction 5 is written on the plate girder body 2 by NC. Originally, as shown in FIG. 3B, the vertical stiffener 3 and the horizontal stiffener 4 come to the apex 6 side of the mountain, and the outer surface thereof is attached so as to follow the ruled instruction 5. Mounting is performed by temporary welding such as spot welding. However, since the operator performs the mounting while looking at the ruled instruction 5, as shown in FIG. 3 (b), the side to which the vertical stiffener 3 and the horizontal stiffener 4 should be mounted (the peak 6 side of the mountain). May be installed on the opposite side.

If this condition is overlooked by actual measurement with a major or the like, if the vertical stiffener 3 and the horizontal stiffener 4 are welded in the main welding of (4) and shipped as they are, when the plate girder block 1 is assembled on site, it is vertical. If the mounting positions of the stiffener 3 and the horizontal stiffener 4 are deviated by the plate thickness, assembly may not be possible.

In that case, all the welds of the vertical stiffener 3 and the horizontal stiffener 4 must be removed and reattached in the correct position.

During that time, there is a problem that the work at the site is interrupted and the process is significantly delayed.

However, in the confirmation method of the present embodiment, first, in the design shape storage step, the three-dimensional design shape of the plate girder block 1 is stored in the server 13 in advance. The three-dimensional design shape memorized at this time is the deflection (camber value) and welding due to the weight of the plate girder block 1 before the main welding of the vertical stiffener 3 and the horizontal stiffener 4 and before assembling as a bridge girder. It is a shape that takes into account the correction value such as the shrinkage allowance due to. In short, the dimensions of the plate girder block 1 are determined so that when the plate girder block 1 is finally assembled as a bridge girder, the plate girder block 1 and other parts can be assembled as designed. Deformation due to welding deformation is conceivable. Therefore, in a personal computer 12 or the like, using software installed in advance, the three-dimensional CAD data of the final product shape is calculated and created in advance in consideration of the above correction value, and the server 13 as a storage device or Store it in the personal computer 12.

Next, as shown in FIG. 1, in the plate girder block mounting step, the plate girder block 1 to which the vertical stiffener 3 and the horizontal stiffener 4 are attached is mounted. At this time, the vertical stiffener 3 and the horizontal stiffener 4 are placed so that the mounting positions can be clearly seen.

Next, in the measuring instrument arrangement step, the three-dimensional shape measuring instrument is arranged at a position where the shape of the plate girder block 1 can be imaged. As the three-dimensional shape measuring instrument, for example, a 3D laser scanner mounted on an omnidirectional camera is used. The 3D scanner 10 can measure a three-dimensional shape in a range of about 0.6 m to 60 m at a horizontal 360 ° and a vertical 300 ° using a laser, for example. The three-dimensional shape measuring instrument is not limited to this, but an instrument having a wide measuring range is used so as to be able to measure a large welded structure as in the present embodiment.

Next, in the three-dimensional shape measuring step, the shape of the plate girder block 1 is measured using the 3D scanner 10. In some cases, measurement may be performed by a plurality of 3D scanners 10, or the 3D scanner may be repositioned at another position for measurement. The data measured by the 3D scanner 10 is transmitted to a personal computer 12 or a tablet as a computer via a wireless LAN router 11 or the like. Further, it may be stored in the server 13.

Next, in the difference extraction step, the three-dimensional measurement shape measured by the 3D scanner 10 and the three-dimensional design shape stored in advance are compared, and the vertical stiffener 3 and the horizontal stiffener 4 are in the plate thickness direction. Extract the presence or absence of differences in mounting positions. Specifically, it is determined whether or not there is a deviation in the mounting position in the plate thickness direction as shown in FIG. 3 (b). For this determination, software or the like pre-installed on the personal computer 12 may be used. For example, software extracts a portion where the error is larger than a predetermined value. Compare the mounting position of the vertical stiffener 3 and the horizontal stiffener 4 in the plate thickness direction in the three-dimensional design shape with the measured mounting position of the vertical stiffener 3 and the horizontal stiffener 4 in the plate thickness direction. ..

Next, in the difference identification step, the personal computer 12 visually indicates the portion where the error of the mounting position is larger than the predetermined value in red by the software. The display may be performed on the display unit 14 of the personal computer 12 or on the screen of the tablet.

Next, in the mounting position correction presence / absence determination step, the operator determines whether or not it is necessary to change the mounting positions of the vertical stiffener 3 and the horizontal stiffener 4 among the differences indicated on the display unit. To do. The color-coded portion displayed on the display unit 14 is confirmed, and for example, if it is determined that a mounting error in the plate thickness direction has occurred, it is determined that the mounting position needs to be changed.

In some cases, the difference may be confirmed with a VR device including a headset. Then, the part where the mounting position is wrong can be easily confirmed in the virtual space using the VR device. The operator confirms this explicit difference and visually grasps that the mounting position is incorrect. For example, if the mounting position is deviated by the plate thickness, most of the vertical stiffener 3 and the horizontal stiffener 4 are clearly shown in red or the like, and it is easy to find an error in the mounting position and correct it. Can be judged.

Next, in the mounting position correction execution step, the temporary welding of the vertical stiffener 3 and the horizontal stiffener 4 that are determined to require correction of the mounting position is removed, and the temporary welding is placed at the same correct position as the three-dimensional design shape. Reinstall by etc.

Next, the process proceeds to the subsequent step (4) welding of the vertical stiffener 3 and the horizontal stiffener 4.

As described above, in the present embodiment, by using the 3D scanner 10 that can measure even the large plate girder block 1, even one person can measure the outer shape of the plate girder block 1. Then, by comparing and clarifying the three-dimensional design shape memorized in advance and the actually measured three-dimensional measurement shape, it is more accurate with a smaller number of people than the conventional measurement with a measure by multiple people. The mounting position can be confirmed quickly. As a result, it is possible to prevent the process from proceeding to the subsequent process as it is by correcting the mounting position when the mounting position is different.

Further, the final finished product shape is the finished shape after welding, and the mounting position of the vertical stiffener 3 and the horizontal stiffener 4 is confirmed in the temporarily fixed state before the main welding. However, in reality, if the vertical stiffener 3 and the horizontal stiffener 4 are not shaped in consideration of their own weight and shrinkage during welding, differences in mounting positions will be detected in many parts. However, in the present embodiment, the three-dimensional design shape is a shape that takes into consideration the bending of the vertical stiffener 3 and the horizontal stiffener 4 due to their own weight before the main welding and the shrinkage allowance due to the welding. By comparing, it is possible to more accurately and surely extract an error in the mounting position of the vertical stiffener 3 and the horizontal stiffener 4.

If the welded structure is a large plate girder block 1 of 10 m or more as in the present embodiment, the final product after the welding process is transported to the site and assembled at the site. Therefore, if there is an error in the mounting position, the work is performed. It is necessary to interrupt and correct the mounting position, which has a large effect on the entire work process. However, according to the present embodiment, the mounting position of the vertical stiffener 3 and the horizontal stiffener 4 is easily and surely determined. Since mistakes can be extracted, correction of the mounting position in the field is surely prevented.

Therefore, according to the method for confirming the member mounting position according to the present embodiment, it is possible to easily and surely confirm whether or not the parts are mounted at the correct positions with a small number of people.

(Other embodiments)
The present invention may have the following configuration with respect to the above embodiment.

That is, in the above embodiment, the large plate girder block 1 has been described as the welded structure, but the present invention is not limited to this, and can be applied to other large welded structures such as bridge box girders.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and applications.

1 plate girder block
2 Plate girder body
3 Vertical stiffener (mounting member)
4 Horizontal stiffener
5 Rule writing instruction
6 mountain peaks
10 3D scanner (3D shape measuring instrument)
11 Wireless LAN router
12 Personal computer (computer / storage device)
13 Server (storage device)
14 Display

Claims (4)

In the method of confirming the member mounting position for confirming the mounting position of the mounting member in the welded structure,
A design shape storage process that stores the three-dimensional design shape of the welded structure in a storage device in advance,
The welded structure mounting process for mounting the welded structure before the main welding to which the mounting member is attached, and
The measuring instrument placement process of arranging the three-dimensional shape measuring instrument at a position where the shape of the welded structure can be imaged,
The three-dimensional shape measurement process of measuring and transmitting the shape of the welded structure using the three-dimensional shape measuring instrument, and
Differences in which the three-dimensional measurement shape measured by the three-dimensional shape measuring instrument by a computer is compared with the three-dimensional design shape stored in advance, and the presence or absence of a difference in the mounting position in the plate thickness direction of the mounting member is extracted. Extraction process and
The difference specification step of visually indicating the mounting member whose difference has been extracted by the above computer on the display unit, and
Among the differences specified on the display unit, the mounting position correction presence / absence determination process for determining whether or not the mounting position of the mounting member needs to be changed, and
A method for confirming a member mounting position, which comprises a mounting position correction execution step of remounting a mounting member determined to need to be changed in the mounting position to the same correct position as the above three-dimensional design shape. In the method for confirming the member mounting position according to claim 1,
The three-dimensional design shape is a method for confirming a member mounting position, which is characterized in that the shape considers bending due to its own weight before main welding of the mounting member and shrinkage allowance due to welding. In the method for confirming the member mounting position according to claim 1 or 2,
The welded structure is a plate girder block that forms part of the bridge girder.
A method for confirming a member mounting position, wherein the mounting member is a steel plate before main welding positioned on the plate girder block. In the method for confirming the member mounting position according to claim 3,
A method for confirming a member mounting position, wherein the welded structure is a large welded structure having a length of 10 m or more.

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