JPH0218292A - Manufacture of crane guarder - Google Patents

Abstract

PURPOSE:To contrive the substantial reduction of welding labor hours by folding a steel plate of predetermined length into a section of squared shape with one end open to form a set of guarder members by butt welding and welding an auxiliary horizontal stiffener to function as the backing strip, when a guarder for an overhead traveling crane or the like is manufactured. CONSTITUTION:A steel plate of predetermined length is folded into a section of squared shape with one end open, forming a set of guarder members 11, 12 of different height in the erection part. A main horizontal stiffener 14 is parallelly welded to be opposed facing to both internal surfaces of the guarder member 11 in its lengthwise direction. Further a vertical stiffener 15, having notched parts 15a, is welded in a required quantity in a span direction with a predetermined space to an internal wall part of the guarder member 11, while an auxiliary horizontal stiffener 16 is opposed facing to an inner opening edge 11b of the guarder member 11 along this opening edge 11b, further one part of the stiffener 16 is welded so as to protrude to the upper along the internal wall of the guarder member 11. Subsequently, an opening part 12a of the guarder member 12 is inserted to the upper of an opening part 11a, thereafter opening edge mated surfaces and the horizontal stiffener 16 are integrally welded from both sides. Finally, a traversing rail is welded to the guarder member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a crane girder that supports the weight of an overhead crane or the like.

(Prior Art) A method of manufacturing a conventional box-shaped crane girder will be described with reference to FIGS. 10 to 17. First, as shown in Fig. 1O, two web materials 1.1 (the negative one is not shown) cut into predetermined lengths are placed on a surface plate.
After making a predetermined mark at a position of about 1/4 to 115 of the depth H of this web material L (downward position M from the upper flange material side which is the compression side), mark the main horizontal stiffener 2 at a predetermined interval. ,2.
..., and the main horizontal stiffeners 2, 2. ... and the lower flange material side, which is the tension side, at a predetermined interval between horizontal stiffeners 3, 3. ..., it is actually welded from both sides W1
do.

On the other hand, as shown in Fig. 11, the upper flange material 4 cut to a predetermined length is placed on the north surface plate, and after making a predetermined marking on the upper surface of the upper flange material 4, the required number of marks are made in the span direction. Vertical stiffeners 5,5. ... are planted at right angles at predetermined intervals and temporarily welded W2. Then, as shown in FIG. 12, the vertical stiffeners 5, 5, 1 and 2 are suspended vertically by a crane or the like (as shown in the diagram). . . , the upper flange material 4 and the inner joint surfaces of the web materials 1, 1, and the web material 1.1 and the vertical stiffener 5.5. ...Which joint surface should be temporarily welded W3? Then, after correcting the camber and sag of the crane girder in this state, as shown in the 11:1 diagram, the earth flange material 4 and the web materials I, 1. Inner joint surface with vertical stiffener 5
,5. ... and the joint surface of the -1 flange material 4, the vertical stiffeners 5, 5. ... and the joint surface of the web material 1.1 and the vertical stiffeners 5, 5. ...and each stiffener 2.2. ...and 3,3. . . . Main welding W4 is performed on the joint surfaces with...

Therefore, as shown in FIG. 14, the outer joint surface of the web material 1.1 and the lower flange material 6 is attached with the lower flange material 6 attached to the upper surface of the web material 1.1 to form a box shape. Do temporary welding W.

Then, as shown in Figure 1S, this crane girder is placed sideways on the surface plate. At, the outer joint surfaces of the upper and lower flange materials 4 and 6 and the web material 1.1 are main welded W6.

Then, as shown in FIG. 16, this crane crane gutter is reversed, and the outer joint surfaces of the upper and lower flange materials 4 and 6 and the opposite web materials 1 and 1 are welded W7.

Finally, as shown in FIG. 17, the transverse rail 7 of the hoisting machine is placed on the upper surface of the upper 7 lung member 4, and the crane girder is completed by welding.

(Problem to be solved by the invention 1-)) However, in the conventional manufacturing method, as shown in FIG. Since there are six welding points on each joint surface, there is a problem that the number of welding steps increases because there are many welding points.

Also, upper and lower flange materials 4 and 6 and web material l.

1 was processed and manufactured separately, which caused the problem of requiring a large manufacturing space within the factory.

The present invention has been made to solve the above-mentioned conventional problems.

(Means for Solving the Problems) In order to solve the above problems, the method for manufacturing a crane girder of the present invention comprises bending a steel plate into a U-shaped cross section and forming a pair of girder members with different heights of upright portions. Main horizontal stiffeners are welded in parallel to each other in the longitudinal direction of the girder member with the higher height of one of the girder members, and the inner wall of the girder member is Welding a required number of vertical stiffeners having notches in the section in the span direction at predetermined intervals, and arranging compensating horizontal stiffeners to face the inner opening edge of the girder member along the opening edge, and after welding a part of the girder member so as to protrude upward along the inner wall of the girder member, and then inserting the opening of the other girder member above the opening of the girder member so as to face each other; The girder member has a structure in which the opening edge mounting surfaces of the girder members and the horizontal stiffener are integrally welded from both outer sides of the girder members.

(Function) Using the above method, only two main welding parts were required for the crane girder, and the horizontal stiffener could function as a backing metal for the butt weld, so the welded parts were reliable. I was able to significantly improve my performance. Further, the crane girder can be manufactured by simply storing the girder member having a U-shaped cross section on a surface plate.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 9.

FIG. 1 is a front view of an overhead crane manufactured according to the present invention;
FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. In Figure 1, 8 is a crane girder, 9 is a crane girder 8
A hoisting machine runs rampant along the road.

10 is its transverse rail.

In FIG. 3, reference numerals 11 and 12 designate a pair of girder parts IJ formed by bending steel plates of a predetermined length so that they have a U-shaped cross section.・- carder member 1
1 and 12 have the same widths Ai- and Ai (') and are formed with different heights lal and 82 of their standing parts, and the various widths A and heights B are 9-joules I,. 'C has been mass-produced.Using these girder members 1i and 12,
Crane'I! The process of manufacturing 41. to 8 will now be described.

1 2 ・Force girder member i i゛・f, i.e., the girder member 1N with the higher height of the raised part, and the opening +1a of r- with the 11 direction ii''B I 3, placed on L-, between the garter members of the ζ rotor -'r-,-,7,i
As shown in Fig. 4 and Fig.
] 4 are welded in parallel with each other at a predetermined interval. Attach to this main horizontal stiffener 14.1 (height Ht++Pz when openings 11a + 2a of girder members 11 and 12 are erected y1 facing each other) c 8th FA
) downward 1/4-1. , '5 and 5, maf'-1
Gap between adjacent horizontal stiffeners 14.14. is a dimension slightly larger than the thickness of the vertical stiffener 15 described in "4" below.

Inside the gutter member 11 formed in this way, as shown in FIG.
．． The height C of the vertical stiffener 15 when inserted from the opening 11a of the girder member 11 through the gap t1 of 14 is:
Girder member 11. , +2 openings 11a, 11a are formed to be slightly larger than the inner width of the height (B++Bz) when they are combined facing each other. It is something that Each of the four corners of this vertical stiffener I5 has a notch (1sc) to fit the bent part of the girder member 11, and a notch is provided at the approximate center of the side surface in contact with the inner opening edge jib of the girder member 11. Parts 15a and +5a are formed. This Jo eel-shaped pigtail is @direct stiffener! 5 are planted at right angles, and the joint surfaces between the inner wall of the gutter member 11 and the vertical stiffeners 15, and the joint surfaces between the main horizontal stiffeners 14 and the vertical stiffeners 15 are straightened. 6 to be welded, 4 = inner opening edge of girder member 11], Ib, fJS7! ], the compensating horizontal stiffener F4 material 1616 is made to face along the opening edge, and this compensating horizontal stiffening material 16 and the inner surface of the girder member 1.1 are welded. The installation of this compensating horizontal stiffener 16 is done vertically! (The compensating horizontal stiffener 16 is placed on the water section 15b of the notch 15a of the stiffener 15, and a part of it is welded along the inner wall of the garter member 11. The water replenishment stiffener 16 is made of steel such as angle steel or channel steel.

Accordingly, as shown in FIG. 8, from above the opening 11a of this garter member 11, the other girder member 12, that is, the girder member 12 with a lower height of the upright part, is placed so that its opening 12a faces the other girder member 12. Let it be inserted. At this time, girder member 1
The inner opening edge 12b of the vertical stiffener 15 is in close contact with the northern extension of the flat stiffener I6. Height when +2 is assembled (BI+ 82
), so that when the inner surface of the girder member 12 is in contact with the vertical stiffener 15, the opening edge mating surfaces of each girder member 11 and 12 are as shown in FIG. As shown, an appropriate route interval L2 can be maintained.

Then, the crane girder 8 is formed by simultaneously welding the opening edge mating surfaces of both girder members 11 and 12 and the compensating horizontal stiffener 16 from both sides of the girder members 11 and 12 using an automatic welding machine. Note that this welding position is not particularly limited, and the crane gutter 8 is placed horizontally at 41.
Of course, it is also possible to weld one side at a time in the opposite direction. Further, as shown in FIG. 9, the girder member 11
．． If the edges of the opening 12 are provided with a groove as desired, welding with deeper penetration can be performed. In addition, the compensating horizontal stiffener 16 functions as a water-moisture stiffener for the crane girder 8, and each girder member J1 and 1 is butt-welded.
It also has an opportunity f7 as a backing money of 2.

Finally, after inverting the crane girder 8 formed in this way, as shown in FIG. Complete 8.

(Effects of the Invention) By manufacturing a crane girder by the method described in detail above, the present invention provides the following effects.

■Since the crane girder requires only two main welding parts, welding time is greatly reduced and work efficiency is significantly improved.

■As welding man-hours are reduced, production costs are reduced and production can be completed in a short delivery time.

■ By making the horizontal stiffener function as a backing metal in the welded part, the reliability of this butt welded part can be significantly improved.

□□□) The crane girder can be manufactured by simply storing the girder member, which has a U-shaped cross section, on a surface plate, so the production space in the factory is significantly smaller than in the past.

Since the crane is manufactured using girder members that have been made (Φ modularized 1/pre-produced), the quality is stable.

[Brief explanation of drawings]

Fig. 1 is a front view of the overhead crane of the present invention, and Fig. 2 is a front view of the overhead crane of the present invention.
3, 4, and 6 to 8 are sectional views showing the process of manufacturing a crane girder according to the present invention, and FIG. 5 is a sectional view taken along the line 9 is an enlarged sectional view of the section ■ in FIG. 8, and FIGS. 10 to 14 are perspective views showing the manufacturing process of a conventional crane girder. 1 is a sectional view showing a conventional crane girder manufacturing process. 8...-Crane girder 11... Gutter member 11a
...Opening part 11b...Inner opening edge 12...
・Girder part JA12a...Opening part 14...Main horizontal stiffener 15...Vertical stiffener 15...Notch part
16...Compensation horizontal stiffener patent Applicant Nippon Hoist Co., Ltd. Figure 1 Figure 4 Figure 8 Crane gear Figure 5 Figure 6 Figure 10 Figure 11 Figure 8 Figure 9 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17

Claims (1)

[Claims] (1) A pair of girder members with different heights of upright parts are formed by bending a steel plate into a U-shaped cross section, and the longitudinal direction of the girder member with the higher height of the upright part of the pair of girder members Main horizontal stiffeners are welded in parallel to each other on both sides of the inner side, and vertical stiffeners having cutouts approximately in the center of the sides are placed on the inner wall of the girder member at predetermined intervals. In addition to welding the required number of welds in the span direction, the inner opening edge of the girder member is
Compensating horizontal stiffeners are placed opposite to each other along the edge of the opening, and a portion thereof is welded so as to protrude upward along the inner wall of the girder member. , after inserting the other girder member with the opening facing each other, the opening edge mating surfaces of both the girder members and the horizontal stiffener are integrally welded from both outsides of the both girder members. A method for manufacturing a crane girder, characterized by: