JPH07115223B2 - Splice plate replacement method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for replacing a splice plate used for joining splice plates.

[Prior Art] Where there are roads on the lower side and the upper side, such as a grade separation road, for example, as shown in FIG. 6, a steel frame 1 having a gate shape is installed so as to straddle the road 4, and 1, a bridge-shaped road 6 on which a steel floor slab 5 is paved is placed so that a vehicle can travel on each of the lower road 4 and the upper road 6.

In the portal frame 1 of such a three-dimensional road, the base materials 1a and 1b are joined together by disposing the splice plate 2 at the joint portion between the base materials 1a and 1b in the horizontal portion and attaching them with a large number of bolts 3. .

Although the splice plate 2 for joining the base materials 1a and 1b is arranged so as to surround the joint portion, it may be necessary to replace the splice plate for repair or the like.

Conventionally, when replacing the splice plate 2,
As shown in the figure, the pillar 7 is erected and the bolt 3 is removed while the horizontal base material 1b is supported, the splice plate 2 is removed, and the newly prepared splice plate 2 is set and stopped with the bolt 3. Then, , The method of removing the pillar 7, or the base material 1 of the horizontal part as shown in FIG.
A detour 8 is provided on the side walls of a and 1b to connect both base materials 1a and 1b, and in this state, the bolt 3 is removed to splice plate 2
Was removed and a new splice plate 2 was attached, and so on.

[Problems to be Solved by the Invention] However, in the method of erecting the pillar 7 shown in FIG. 6 and replacing the splice plate 2, the pillar 7 is placed at the center of the road 4.
It is practically difficult to stand up the pillar 7 because the vehicle has to stand on the road 4 and the vehicle is running on the road 4.
In the method of connecting the base materials to each other and replacing the splice plate 2 with the detour shown in the figure, the work of providing the detour 8 is required.

Therefore, the present invention is intended to provide a method for replacing a splice plate in which a pillar cannot be erected without replacing the splice plate.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention cuts the splice plate a little and simultaneously groove-processes the abutting portions of both base materials, and thereafter, the groove of the base material. Butt weld the processed part, then cut the splice plate again a little and do the butt welding of the base material in the same way.Sequentially repeat the same operation to cut and divide the splice plate, then remove the bolts and remove the base material. Then, remove it and attach a new splice plate.

[Operation] When cutting the splice plate and butt welding of the base material are performed in parallel, when removing the splice plate,
Since the two faces are welded, the splice plate can be replaced without the need for struts or detours to support the base material.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention when replacing the splice plate 2 in the portal frame 1 in which the base materials 1a and 1b are joined by the splice plate 2, and the present invention is a high frequency grinder. 9 and the welding device 10.

When the base materials 1a and 1b have a square cross section, the base materials 1a and 1b are removed from the splice plate 2 on one surface.

First, as shown in FIG. 1, a high-frequency grinder 9 divides the splice plate 2 into two along the abutting surfaces of the base materials 1a and 1b, for example, within a required length range, for example, about the entire length of the splice plate 2 on one surface. Cut 1/10 length. When the abutting portions of the base materials 1a and 1b are exposed along the cutting line by this cutting, the groove of the abutting portions of the base materials 1a and 1b is simultaneously performed by the high frequency grinder 9 as shown in FIG. Next, butt welding of the base materials 1a, 1b subjected to the groove processing is applied to the base materials 1a, 1b by using a welding device 10 as shown in FIG.

The length of the groove processing that is performed at the same time as the cutting length that is cut and cut by the high frequency grinder 9 is in the range of about 1/10 of the total joining length of one surface, but the joining portion of the base materials 1a and 1b As shown in FIG. 3, since the splice plates 2 are on both inner and outer surfaces and the high frequency grinder 9 cuts only one of the two surfaces, even if the cutting length is one-tenth of the total joining length. Actually, only about 5% of the cross section is cut off, and since it is about the error of the JIS plate thickness, there is no problem in strength.

After the cutting of the splice plate 2 and the groove processing of the base materials 1a and 1b are performed as shown in Fig. 1 within the required length range as described above, the butt welding of the groove portions of the base materials 1a and 1b is performed. As shown in FIG. 2, thereafter, the same operation is repeated to cut one surface of the splice plate 2 having only one surface over the entire length, and butt-welding one surface of the base materials 1a and 1b. Third
In the figure, 11 is the cutting point of the splice plate 2, 12 is the base metal
Grooves 1a and 1b, and 13 are welded portions.

Next, as shown in FIG. 4, the splice plate 2 cut and divided on one surface is divided into bolts 1 one by one.
After removing this, remove it from the surface of the base materials 1a and 1b, and then replace the new splice plate 2 with the base materials 1a as shown in FIG.
Set at the joint of 1b and tighten the bolt 3 to secure the base materials 1a, 1b
To complete the replacement of the splice plate 2 on one side. In this case, since the base materials 1a and 1b are butt-welded, a new splice plate 2 is formed on the outside.
Although it is not necessary to attach the splice plate 1 to the splice plate 1 after welding, the welding inspection is necessary and the bolt holes 14 formed in the base materials 1a and 1b need to be filled in when joining only the butt welding portion 13. Attach and join.

As shown in FIG. 5, when the replacement of the splice plate 2 on one surface is completed, the splice plate 2 on the next surface is replaced. Also in this case, the cutting of the splice plate 2 by the high frequency grinder 9 and the base material 1 are carried out in the same manner as described above.
Grooving of a, 1b and butt welding of the base materials 1a, 1b that have been grooved by the welding device 10 are alternately repeated to proceed with the work of one splice plate 2 from one end to the other end.
After that, the divided splice plate 2 is removed, a new splice plate 2 is attached, work is sequentially performed on another surface, and replacement is performed over the entire circumference.

The cutting and the groove processing may be performed by means other than the high frequency grinder.

[Effects of the Invention] As described above, according to the method of replacing the splice plate of the present invention, the splice plate arranged at the joint portion of the base material is cut into small length ranges at the same time as the groove processing of the base material is performed. ,
While proceeding with the butt welding of the grooved base material in parallel, proceed along the entire length of the splice plate, then remove the divided splice plate from the base material surface and attach a new splice plate. Since the splice plate on another surface is replaced with a new one, it is possible to easily replace the splice plate in a place where the column cannot be erected, and it is not necessary to provide a bypass route in the base material, which is a large-scale operation. It is possible to achieve an excellent effect that work can be performed without providing equipment.

[Brief description of drawings]

1 and 2 are perspective views showing an example of an embodiment of the method of the present invention, FIG. 3 is a cross-sectional view of a base metal joint, and FIGS. 4 and 5 are replacement steps by the method of the present invention. FIG. 6 is a front view showing an example of a conventional method, and FIG. 7 is a plan view showing another example of the conventional method. 1a, 1b ... Base metal, 2 ... Splice plate, 3 ... Bolt, 9 ... High frequency grinder, 10 ... Welding device.

Claims (1)

[Claims] 1. A splice plate is cut little by little, and at the same time, a butt portion of a base material exposed at the cut portion is groove-processed, and then butt-welding of the groove-processed base material is performed, and the cutting and the base material are performed. Of the splice plate characterized by installing the new splice plate by removing the split splice plate from the base material by cutting the splice plate little by little while repeating the groove processing and the butt welding of the base material. Replacement method.