Method and equipment for repairing welded joints in steel decks

Abstract

To provide a repair method and a repair device for a welded part of a steel plate deck that can inspect and repair striking-through of a welded part in a trough rib without making a person enter the trough rib.SOLUTION: A self-running-type inspection device mounted with a camera 26 is made to run, along a longitudinal direction of a trough rib 3, in the trough rib 3, and an image of a welded part in the trough rib 3 photographed with the camera 26 of the inspection device is outputted to an external monitor, so as to measure a position of striking-through of the welded part confirmed by the monitor, and a self-running-type scraping-off device 20 is moved to the position of the striking-through, so that the scraping-off device 20 scrapes off a weld bead 4a having the striking-through caused.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a method and device for repairing welds in a trough rib welded to a steel deck of a bridge, the method and device repairing penetration through a weld in a trough rib. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as a deck used in bridges, a steel deck formed by welding a reinforcing steel trough rib to the underside of a flat deck plate made of steel plate has been known (see, for example, Patent Document 1).

[0003] The trough rib is formed in a roughly U-shape and is joined to the steel plate of the deck plate by fillet welding. When welding, a U-shaped groove is formed on the joining end surface of the trough rib, and welding is performed from the outside of the trough rib along the longitudinal direction of the trough rib. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-307561 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when fillet welding is performed from the outside of the trough rib, melt-through may occur in the welded portion. In such a case, the weld bead that has melted through remains on the inside of the trough rib, but since the trough rib has a sealed structure with partition walls provided at multiple locations in the longitudinal direction, the weld bead that has melted through cannot be visually confirmed from the outside during or after welding.

[0006] On the other hand, in recent years, steel decks that do not have a bulkhead inside the trough rib and use an air drying system to ventilate the inside of the trough rib are becoming more common. Since the inside of the trough rib of such a steel deck is not sealed with a bulkhead, it is considered possible to inspect the entire inside of the trough rib from an opening at one end in the longitudinal direction. However, the opening of the trough rib is not large enough for a person to enter, and the total length is long (e.g., 25 m), so there is a problem that it is difficult to manually inspect and repair the welds inside the trough rib.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a method and device for repairing welds in steel decks that can inspect and repair welds in trough ribs without the need for personnel to enter the trough ribs. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a method for inspecting and repairing welds in a trough rib welded to a deck plate of a steel deck, comprising the steps of: moving a self-propelled inspection device equipped with a camera through the trough rib in the longitudinal direction of the trough rib; and outputting an image of the weld in the trough rib captured by the camera to an external monitor; By measuring the distance from a predetermined position in the longitudinal direction of the trough rib to the inspection device, The position of the strike-through portion of the weld confirmed by the monitor is measured, and a self-propelled scraping device is moved to the position of the strike-through portion and the strike-through weld bead is scraped off by the scraping device.

[0009] In order to achieve the above object, the present invention provides a steel deck weld repair device that inspects and repairs weld penetration in a trough rib welded to a deck plate of a steel deck, the device comprising: a self-propelled inspection device equipped with a camera that travels within the trough rib along the longitudinal direction of the trough rib; a monitor that is disposed outside the trough rib and outputs an image of the weld in the trough rib captured by the camera; By measuring the distance from a predetermined position in the longitudinal direction of the trough rib to the inspection device,The welding apparatus is provided with a position measuring means for measuring the position of the penetration part of the weld confirmed by the monitor, and a self-propelled scraping device for moving to the position of the penetration part measured by the position measuring means and scraping off the penetrated weld bead.

[0010] As a result, the inspection device checks for the presence or absence of a weld bead that has penetrated through the trough rib, and the weld bead that has penetrated through the trough rib is scraped off by the scraping device, making it possible to inspect and repair the weld penetration in the trough rib without a person having to enter the trough rib. Effect of the Invention

[0011] According to the present invention, it is possible to inspect and repair the weld penetration in the trough rib without a person entering the trough rib. Inside the This makes it possible to efficiently inspect and repair weld penetration in a factory or on an existing bridge, thereby improving the quality and durability of the steel deck. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a partial perspective view of a steel deck showing one embodiment of the present invention; [Diagram 2] Partial perspective view of a steel deck with the underside facing upward [Diagram 3] Front view of the main part of the steel deck [Figure 4] Front cross-sectional view of the main part of the steel deck [Diagram 5] Plan view of the inspection device [Figure 6] Inspection device block diagram [Figure 7] Plan view of scraping device [Figure 8] Plan view of the rotary blade [Figure 9] Enlarged side view of the main part of the rotary blade [Figure 10] Block diagram of scraping device [Figure 11] FIG. 2 is a plan view showing the operation of the inspection device; [Figure 12] Diagram showing monitor screen [Figure 13] FIG. 2 is a plan view showing the operation of the scraping device; [Figure 14] Front cross-sectional view of the main part showing the weld bead cutting process [Figure 15] Front cross-sectional view of the main part showing the weld bead cutting process [Figure 16] Front cross-sectional view of the main part showing the weld bead cutting process [Figure 17] FIG. 13 is a front cross-sectional view of a main part of another embodiment of the scraping device; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 1 and 2 show one embodiment of the present invention, illustrating a weld repair method for inspecting and repairing weld penetration in a trough rib of a steel deck, and an apparatus used therefor.

[0014] The steel deck 1 shown in the figure has a flat deck plate 2 made of steel plate, and multiple reinforcing trough ribs 3 are welded to the underside of the deck plate 2. The trough ribs 3 are made of steel material formed into an approximately U-shape, and are welded to the deck plate 2 with the steel deck 1 turned upside down in a factory or the like as shown in Figures 2 and 3. At that time, a V-shaped groove is formed on the joint end surface of the trough rib 3, and welding is performed from the outside of the trough rib 3 along the longitudinal direction.

[0015] When fillet welding is performed from the outside of the trough rib 3, the welded portion 4 may sometimes melt through to the inside of the trough rib 3. In such a case, the weld bead 4a that has melted through remains on the inside of the trough rib 3 as shown in FIG.

[0016] The repair device of this embodiment is composed of a self-propelled inspection device 10 for inspecting whether or not there is a weld bead 4a that has penetrated through the trough rib 3, and a self-propelled scraping device 20 that scrapes off the weld bead 4a in the trough rib 3.

[0017] The inspection device 10 comprises an apparatus main body 11 capable of entering the trough rib 3, a traveling device 12 for traveling the apparatus main body 11, an operation unit 13 for remotely operating the traveling device 12, a camera 14 mounted on the apparatus main body 11, a monitor 15 for outputting images from the camera 14, and a measuring tool 16 as a position measuring means for measuring the position of the apparatus main body 11.

[0018] The traveling device 12 is made up of a drive mechanism, a steering mechanism, a battery, etc. (not shown), and drives wheels 11a attached to the device body 11 to make the device body 11 travel.

[0019] The operation unit 13 is connected to the traveling device 12 wirelessly or by wire, and allows an operator to operate the traveling device 12, such as moving the device main body 11 forward, backward, steering, etc.

[0020] The camera 14 is a well-known high-definition camera that captures an image in front of the device main body 11 and has a function of recording the captured image.

[0021] The monitor 15 is connected to the camera 14 wirelessly or by wire, and is disposed on the operator's side together with the operation unit 13 .

[0022] The measuring tool 16 is a strip-shaped measuring tape used in known tape measures, one end of which is connected to the rear end of the device body 11 and the other end of which is disposed outside the trough rib 3.

[0023] The scraping device 20 comprises an apparatus main body 21 capable of entering the trough rib 3, a traveling device 22 for traveling the apparatus main body 21, a holding device 23 capable of holding the apparatus main body 21 within the trough rib 3, a cutting machine 24 for scraping off the weld bead 4a that has penetrated through into the trough rib 3, an operating unit 25 for remotely operating the traveling device 22, the holding device 23 and the cutting machine 24, a camera 26 mounted on the cutting machine 24, and a monitor 27 for outputting images from the camera 26.

[0024] The traveling device 22 is made up of a drive mechanism, a steering mechanism, a battery, etc. (not shown), and drives the wheels 21a attached to the device body 21 to make the device body 21 travel.

[0025] The holding device 23 has a pair of holding parts 23a provided on both side surfaces of the device body 21, and each holding part 23a is provided so as to be movable in the width direction of the device body 21 by a driving mechanism such as a cylinder (not shown). Also, each holding part 23a is provided with a guide roller 23b that abuts against the inner surface of the trough rib 3.

[0026] The cutting machine 24 includes an arm 24a rotatably mounted on the device body 21, a cutting head 24b mounted on the tip of the arm 24a, and a rotary blade 24c attached to the cutting head 24b. The cutting head 24b is moved to a cutting position by the arm 24a, and the cutting object is cut off by the rotary blade 24c. The rotary blade 24c is provided at four equal intervals around the rotation shaft 24d as shown in FIG. 8, and rotates horizontally around the rotation shaft 24d by a driving mechanism such as a motor (not shown). In addition, the rotary blade 24c is formed so that the cutting edge angle θ is equal to the angle between the inner surface of the trough rib 3 and the deck plate 2 as shown in FIG. 9. A guide portion 24e that abuts against the inner surface of the trough rib 3 is provided above the rotary blade 24c, and the abutment surface of the guide portion 24e and the rotary blade 24c are formed to be flush with each other with respect to the inner surface of the trough rib 3.

[0027] The operating unit 25 is connected wirelessly or by wire to the traveling device 22, the holding device 23 and the cutting machine 24, allowing the operator to operate the traveling device 12, such as moving the device main body 21 forward, backward and steering, and to operate the holding device 23, such as moving each holding part 23a, and the cutting machine 24, such as rotating the arm 24a and rotating the rotary blade 24c.

[0028] The camera 26 is a well-known high-definition camera and is adapted to capture an image of the cutting position of the cutting machine 24 .

[0029] The monitor 27 is connected to the camera 26 wirelessly or by wire, and is disposed on the operator's side together with the operation unit 25 .

[0030] The inspection step by the inspection device 10 and the scraping step by the scraping device 20 will be described below with respect to the method for repairing a welded portion in this embodiment.

[0031] First, in the inspection process, the main body 11 of the inspection device 10 is placed at one end side in the trough rib 3, and is made to travel toward the other end side in the trough rib 3 as shown in Fig. 11. During this, the main body 11 travels while capturing an image in front of it with a camera 14, and the image is output to a monitor 15 and recorded as a video in a storage device (not shown). The monitor 15 displays the deck plate 2 and the inner surface of the trough rib 3 on a screen 15a as shown in Fig. 12, and the operator travels the main body 11 while watching the image on the monitor 15. In addition, a measuring tool 16 is fed into the trough rib 3 together with the traveling main body 11.

[0032] Here, when the operator confirms from the image on the monitor 15 that a weld bead 4a has appeared at the boundary between the deck plate 2 and the trough rib 3, which has penetrated through into the trough rib 3, the device body 11 is stopped at the position of the weld bead 4a, and the position of the weld bead 4a is measured by the measuring tool 16. In this case, as shown in Fig. 11, the distance L from the device body 11 to one end of the trough rib 3 is measured by reading the scale on the measuring tool 16, and the measured distance is recorded as the position of the weld bead 4a.

[0033] Next, in the scraping process, the device body 21 of the scraping device 20 is placed at one end side in the trough rib 3, and the device body 21 is moved toward the other end side in the trough rib 3 to the position of the weld bead 4a. At that time, since the measured distance L from one end of the trough rib 3 to the weld bead 4a is recorded in the inspection process, the device body 21 is moved to the position of the weld bead 4a based on the distance L. In addition, the position and state of the weld bead 4a are confirmed by the image recorded by the camera 14. After the device body 21 is moved to the cutting work position as shown in FIG. 13, each holding part 23a of the holding device 23 is moved toward the outside in the width direction to abut against the inner side surface of the trough rib 3, and the device body 21 is held so as not to move in the width direction. At that time, each holding part 23a of the device body 21 abuts against the inner side surface of the trough rib 3 via the guide roller 23b, so that the device body 21 is held in a state in which it can move in the front-rear direction (the longitudinal direction of the trough rib 3).

[0034] Next, the weld bead 4a is scraped off by the cutter 24 of the scraping device 20. That is, as shown in FIG. 14, the cutting head 24b is moved to the cutting position by the arm 24a, and as shown in FIG. 15, the rotary blade 24c is rotated while being pressed against the weld bead 4a to cut the weld bead 4a. At that time, the weld bead 4a is cut along the boundary portion between the deck plate 2 and the trough rib 3 while the device body 21 is moved in the front-rear direction by the traveling device 22. In addition, since the cutting edge angle θ of the rotary blade 24c is equal to the angle between the inner surface of the trough rib 3 and the deck plate 2, the weld bead 4a is cut so as to be flush with the inner surface of the trough rib 3, and the guide portion 24e abuts against the inner surface of the trough rib 3 during cutting, so that the movement of the cutting edge of the rotary blade 24c is restricted at the inner surface position of the trough rib 3. In such cutting work, the cutting location is displayed on a monitor 27 by a camera 26, and while watching the image, an operator performs the cutting work by operating the cutting machine 24 and the traveling device 22. By cutting off the weld bead 4a in this manner, the through-hole portion on the inner surface of the trough rib 3 is repaired so as to be flush with the other portions, as shown in FIG.

[0035] Thus, according to this embodiment, the self-propelled inspection device 10 equipped with the camera 14 is made to travel within the trough rib 3 along the longitudinal direction of the trough rib 3, and the image of the welded portion within the trough rib 3 captured by the camera of the inspection device 10 is output to the external monitor 15, the position of the welded portion confirmed by the monitor 15 is measured, and the self-propelled scraping device 20 is moved to the position of the welded portion, and the welded bead 4a that has been scraped off by the scraping device 20 is scraped off by the scraping device 20. This makes it possible to inspect and repair the welded portion within the trough rib 3 without a person entering the trough rib 3. As a result, inspection and repair of the welded portion within the trough rib 3 that does not have a bulkhead inside can be efficiently performed in a factory or an existing bridge, and the quality and durability of the steel deck can be improved.

[0036] In addition, a measuring tool 16 having one end connected to the main body 11 of the inspection device 10 is used, and the position of the penetration portion of the weld is measured by measuring the distance L from a predetermined longitudinal position (one end) of the trough rib 3 to the main body 11 with the measuring tool 16, so that the position of the penetration portion of the weld can be easily measured without using a complicated structure.

[0037] Furthermore, since the scraping device 20 is provided with a holding device 23 that holds the device body 21 of the scraping device 20 within the trough rib 3 by abutting against the inner surface of the trough rib 3, by holding the device body 21 within the trough rib 3 during cutting, the cutting work can be performed stably.

[0038] In addition, since the scraping device 20 has a rotary blade 24c having a blade angle θ equal to the angle between the inner surface of the trough rib 3 and the deck plate 2, the weld bead 4a can be cut so that it is flush with the inner surface of the trough rib 3, and the weld bead 4a that has penetrated through the trough can be almost completely removed.

[0039] Furthermore, a guide portion 24e that abuts against the inner surface of the trough rib 3 is provided near the rotating blade 24c, and by abutting the guide portion 24e against the inner surface of the trough rib 3 during cutting, the movement of the cutting edge of the rotating blade 24c is regulated at the inner surface position of the trough rib 3. This prevents excessive cutting by the rotating blade 24c and enables accurate cutting of the weld bead 4a that has penetrated through to the back.

[0040] In the above embodiment, the weld bead 4a that has penetrated through the back is scraped off by cutting it with the rotary blade 24c. However, instead of the cutting machine 24 of the scraping device 20, a grinder 28 may be used as in another embodiment shown in FIG. 17, and a spherical grinding wheel 28a attached to the tip of the grinder 28 may be rotated and pressed against the weld bead 4a to grind and scrape off the weld bead 4a that has penetrated through the back.

[0041] Moreover, the above embodiment is merely an example of the present invention, and the configurations of the inspection device 10 and the scraping device 20 are not limited to those described in the above embodiment. [Explanation of symbols]

[0042] 1...steel deck, 2...deck plate, 3...trough rib, 4...welded portion, 4a...weld bead, 10...inspection equipment, 11...main body of equipment, 12...traveling device, 13...operation unit, 14...camera, 15...monitor, 20...scraping device, 21...main body of equipment, 22...traveling device, 23...holding device, 24...cutting machine, 25...operation unit, 26...camera, 27...monitor, 28...grinder.

Claims

1. A method for repairing welds in a steel deck, which inspects and repairs weld penetration in a trough rib welded to a deck plate of a steel deck, comprising: A self-propelled inspection device equipped with a camera is moved inside the trough rib along the longitudinal direction of the trough rib, An image of the welded portion in the trough rib captured by the camera is output to an external monitor; By measuring the distance from a predetermined position in the longitudinal direction of the trough rib to the inspection device, the position of the penetration part of the weld confirmed by the monitor is measured, and A self-propelled scraping device is moved to the location of the welded part, and the scraped part is scraped off by the scraping device. A method for repairing welded joints in steel decks, comprising:

2. A measuring tool having one end connected to the inspection device is used to measure the distance from a predetermined position in the longitudinal direction of the trough rib to the inspection device, thereby measuring the position of the penetration portion of the weld.

2. The method for repairing a welded portion of a steel deck according to claim 1.

3. The weld bead is scraped off by a scraping device while the scraping device is held inside the trough rib by a holding device that abuts against the inner surface of the trough rib.

3. The method for repairing a welded portion of a steel deck according to claim 1 or 2.

4. The weld bead is scraped off using a rotary blade having a blade angle equal to the angle between the inner surface of the trough rib and the deck plate.

4. A method for repairing a welded portion of a steel deck according to claim 1, 2 or 3.

5. A steel deck weld repair device that inspects and repairs weld penetration in a trough rib welded to a deck plate of a steel deck, A self-propelled inspection device equipped with a camera that travels inside the trough rib along the longitudinal direction of the trough rib; a monitor that is disposed outside the trough rib and outputs an image of the welded portion inside the trough rib captured by the camera; a position measuring means for measuring a position of a penetration portion of the weld confirmed by a monitor by measuring a distance from a predetermined position in the longitudinal direction of the trough rib to an inspection device; and a self-propelled scraping device which moves to the position of the through-penetration portion measured by the position measuring means and scrapes off the through-penetration weld bead. A steel deck weld repair device characterized by the above.

6. The position measuring means is composed of a measuring tool having one end connected to the inspection device, and measures the position of the penetration portion of the weld by measuring the distance from a predetermined position in the longitudinal direction of the trough rib to the inspection device with the measuring tool.

6. The steel deck weld repair device according to claim 5.

7. A holding device is provided for holding the scraping device within the trough rib by contacting the inner surface of the trough rib.

7. The steel deck weld repair device according to claim 5 or 6.

8. The scraping device has a rotary blade having a cutting edge angle equal to the angle between the inner surface of the trough rib and the deck plate.

8. The steel deck weld repair device according to claim 5, 6 or 7.

Images