JPH02118408A - Camber quantity detecting method for steel structure member - Google Patents

Abstract

PURPOSE:To accurately measure a camber quantity in safety by irradiating a cross intersection point and the intersection point of the member edge of a longitudinal cross line with beam spots from a couple of laser oscillators and picking up an image of both spots by a video camera. CONSTITUTION:The steel structure member 1 consists of a web 2 and upper and lower flanges 3. A rack 5 is mounted in a free run state on rails 4 which are laid on both lengthwise sides of the member 1. A laser oscillator 6 with a cross ruling device, laser oscillators 7 and 7 which project only laser spots, and the video camera 8 are mounted on the rack 5. A cross ruling line 11 is projected from the oscillator 6 so that the cross intersection point comes to the center of the web 2 and the cross lateral line contacts both edges of the flanges 3; and beam spots 12 and 12 are projected on the cross intersection point and the intersection of the longitudinal cross line and the weld surface of the flanges from the oscillators 7 and 7. Then the spots 12 and 12 are picked up by the camera 8, image processing 9 is performed, and the distance between the image points of the spots 12 and 12 is measured on a monitor TV 10 to detect the camber quantity 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting the amount of camber of a steel structure member, which is suitable for detecting the amount of camber of a main girder, main structure, etc. of a bridge product.

[Conventional technology]

In order to detect the camber amount of each main girder and main structure after the temporary assembly of the main girder and main structure of a long steel bridge member, conventionally, as shown in the perspective view of Fig. 3, one girder was constructed together with the web 2. On the flange 3 to be
4, the operator stops with the surveying rod 15, and another worker visually measures using the transit 17 from the measurement stage 16 at another position, and the worker on the flange 3 moves the measurement point 14 one after another. , the amount of camber is detected based on the difference in measured values between the measurement points 14.

However, with such a detection method, there is a possibility that an error may occur depending on the position of the eyes and the like.

In addition, slab anchors are placed at the feet of workers on the temporary assembly members.
Many stand dowels are welded together, making them difficult to move and creating a high risk of falling.

Furthermore, there is a problem in that the amount of camber is not measured at the stage of manufacturing the parts, but is known at the stage after temporary assembly.

[Problem to be solved by the invention]

The present invention was proposed in view of these circumstances, and
It is an object of the present invention to provide a method for detecting the amount of camber of a steel structure member, which can accurately and precisely measure the amount of camber in a non-contact manner, and can easily, reliably, and safely measure even long members.

[Means to solve the problem]

To this end, the present invention includes mounting a laser oscillator with a marking device, a pair of laser oscillators and a video camera that emit only the beam spot on a frame that can run along the longitudinal direction of a steel structure member, The cross-shaped line from the oscillator is irradiated onto the surface of the member so that the cross-crossing point is at the camber measurement point and the cross-cross line is in contact with the edge of the member, and the beam spot from the pair of laser oscillators is set at the cross-crossing point. The method is characterized in that the beam is irradiated to the intersection point of the member edge of the cross vertical line, the two beam spots are imaged by the video camera, and the amount of camber is measured from the distance between the two beam spots.

[Effect]

With the above-described configuration, it is possible to obtain a method for detecting the amount of camber of a steel structure member, which can accurately and precisely measure the amount of camber in a non-contact manner, and which can easily, reliably, and safely measure even a long member.

〔Example〕

An embodiment of the method for detecting the amount of camber of a steel structure member according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the method of the present invention, and FIG. 2 is a front view of the same.

In the above figure, a steel structure member 1 is composed of a web 2 and upper and lower flanges 3, and a frame 5 is mounted on rails 4 laid on both sides along the longitudinal direction of this steel structure member 1 so as to be freely movable. , the pedestal 5 is equipped with a laser oscillator 6 with a marking device that draws cross-shaped lines, two laser oscillators 7 and 7 that emit only laser spots, and a video camera 8. Further, an image processing device 9 and a monitor TVIO are connected in series to the video camera 8.

In such a device configuration, a cross-shaped line 11 is drawn from the laser oscillator 6 with a line-drawing device, and the point of intersection is located on the web 2.
The laser oscillator 7.7 emits a beam spot of 12°12 at the cross point and the intersection of the vertical cross and the welding surface of the flange 3, respectively. The two beam spots 12.12 are captured by the video camera 8, and the image processing device 9 binarizes the brightness and darkness to perform image processing. The distance between the image points is measured, and the camber amount 13 is detected and grasped.

Thus, according to this method, lasers are irradiated toward the web 2 from the laser oscillator a6 with a scoring device mounted on the pedestal 5 and the two laser oscillators 7.
The video camera 8 captures the two beam spots that illuminate the
The camber amount 13 can be detected simply by capturing the steel structure member 1. Therefore, the camber amount 13 can be detected and grasped with high accuracy without coming into contact with the steel structure member 1. Furthermore, by changing the length of the cross-ruled line 11 or by moving the mount 5 along the rail 4 as appropriate, the camber amount of even a long member can be easily, reliably and safely measured in a factory.

〔Effect of the invention〕

In short, according to the present invention, a laser oscillator with a marking device and a pair of laser oscillators and a video camera that emit only a beam spot are mounted on a frame that can run along the longitudinal direction of a steel structure member, The cross-shaped line from the laser oscillator is irradiated onto the surface of the above-mentioned member so that the cross-crossing point is at the camber measurement point and the cross-shaped horizontal line is in contact with the edge of the member, and the beam spots from the pair of laser oscillators are set at the cross-shaped line. By irradiating the intersection point and the member edge intersection point of the cross vertical line, imaging the two beam spots with the video camera, and measuring the amount of camber from the distance between the two beam spots, it is possible to measure the camber accurately in a non-contact manner. The camber of steel structure members can be measured accurately and accurately, and can be measured easily, reliably, and safely even for long members.
The present invention is industrially extremely useful because it provides a method for detecting amounts.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the camber amount detection method for a steel structure member according to the present invention, and FIG. 2 is a front view of the same. FIG. 3 is a perspective view showing a conventional camber amount detection method. DESCRIPTION OF SYMBOLS 1... Steel structure member, 2... Web, 3... Flange, 4... Rail, 5... Frame, 6... Laser oscillator with marking device, 8... Video camera , 9...Monitor TV, 11...Beam spot, 1

Claims (1)

[Claims] A laser oscillator with a marking device, a pair of laser oscillators that emit only the beam spot, and a video camera are mounted on a frame that can run along the longitudinal direction of the steel structure member, and cross markings can be drawn from the laser oscillator with a marking device. The beam spot from the pair of laser oscillators is irradiated onto the surface of the member so that the cross-crossing point is at the camber measurement point and the cross-cross horizontal line is in contact with the member edge, and the beam spot from the pair of laser oscillators is applied to the cross-crossing point and the member edge intersection of the cross-vertical line. A method for detecting the amount of camber in a steel structure member, characterized in that the two beam spots are imaged by the video camera and the amount of camber is measured from the distance between the two beam spots.