JPH05338987A - Columnar type crane main girder - Google Patents

Abstract

PURPOSE:To decrease the number of welded parts for producing a crane main girder at a low cost, by forming windows in each of the upper wall of a lower column and the lower wall of an upper column, inserting stiffeners and reinforcing plates from these windows and welding them respectively, and welding the upper column to the lower column as the lower wall of the upper column and the upper wall of the lower column are mated with each other. CONSTITUTION:A cylindrical upper column 1 and a cylindrical lower column 2, whose cross sections are squares whose four corners are round, are prepared, and a plural number of rectangular windows 5 are drilled through each of the lower wall 3 of the upper column 1 and the upper wall 4 of the lower column 2, while those window groups being shifted from each other concerning respective walls 3, and 4. Stiffeners 7 are inserted through the windows 5 of the upper column 1 and welded to the frame parts 9 between the windows 5, 5 of the lower wall 3 and the columnar surrounding walls 6 other than the lower wall 3, and reinforcing plates 8 are welded to the column inner walls 6, on the lower face of a lateral rail 11 laid on the upper face of the upper column 1, in those positions between the stiffeners 7, 7 at suitable intervals. Both columns 1, 2 are mutually overlapped with their 2 lower wall 3 and upper wall 4 serving as a mating surface, and the welding parts 15 on both sides of both walls 3, 4 at the mating face are welded together for composing a crane main girder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-type crane main girder that uses a column as a crane girder and has a small number of welding steps.

[0002]

2. Description of the Related Art Conventional crane main girders include box-type crane main girders in which steel plates are welded and combined, and it is easily conceivable to use a column as the crane main girder.

[0003]

Since the conventional box-type crane main girder 12 is assembled by welding steel plates with vertical or horizontal stiffeners 13 and 14 interposed as shown in FIGS. There are many drawbacks that the cost is high.

To use the column as a crane main girder, the traverse rail 11 is welded to the vertical plate of the column as shown in FIG. In order to attach the, the reinforcing plate 8 is required on the inner wall of the column under the traverse rail as shown in FIG.

Further, in order to prevent the steel plate of the column from buckling due to shearing force or bending moment, it is necessary to provide vertical or horizontal stiffening members 13, 14 as shown in FIGS. 5 and 6 of the box-type crane main girder 12. There is.

However, there is a drawback that it is difficult to weld and fix a reinforcing plate and a vertical or horizontal stiffening member to the inner wall of the column.

An object of the present invention is to provide a column-type crane main girder in which a stiffening material and a reinforcing plate can be easily welded to the inner wall of the column and the number of welding points is smaller than that of the conventional box-type crane main girder.

[0008]

A window is provided in the lower upper wall of the upper and lower columns, and a stiffening member and a reinforcing plate are welded to the inner wall of the column through the window, and the upper and lower columns are welded with the lower upper wall as a mating surface. And use it as the crane main girder.

[0009]

Since the windows 5 are provided in the lower upper walls 3 and 4 of the upper and lower columns 1 and 2, respectively, the stiffening material 7 and the reinforcing plate 8 can be inserted into the column inner wall 6 through the windows 5 and easily fixed by welding.

Further, since the upper and lower walls 3 and 4 in which the windows 5 of the upper and lower columns 1 and 2 are bored are welded as a mating surface to form the crane main girder 10, the welded portion 15 is more than the welded copper plate to be assembled. Less.

Further, the window 5 is formed in the lower upper walls 3 and 4 of the upper and lower columns 1 and 2 to reduce the weight of the crane main girder 10, and the horizontal frame portion 16 of the walls 3 and 4 other than the window 5 is provided. Plays the role of a horizontal stiffener, and the rigidity of the crane main girder 10 is increased.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The accompanying drawings showing an example of a crane main girder used for carrying out the present invention will be described in detail. 1 is a side view of a column-type crane main girder of the present invention, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a bottom view of an upper column, FIG. 4 is a plan view of a lower column, and FIGS. The box girder main girder.

Reference numerals 1 and 2 are upper and lower columns having a square tubular shape with rounded corners, and windows 5 and 5 as shown in FIGS. Slide a large number of holes.

Reference numeral 7 is a stiffening member, which is inserted from the window 5 of the upper column 1 and welded to the frame portion 9 between the windows 5 and 5 of the lower wall 3 and the column inner wall 6 other than the wall 3 to form a conventional vertical stiffener. Similar to the rigid member 13, the four corners are cut out.

Reference numeral 8 denotes a reinforcing plate similar to the conventional one, which is welded to the column inner wall 6 on the lower surface of the traverse rail 11 mounted on the upper surface of the upper column 1 at appropriate intervals between the stiffeners 7, 7 and is attached to the lower wall 3. It does not reach.

A column-type crane main girder 10 is constructed by stacking the upper column 1 and the lower column 2 with the lower upper walls 3 and 4 as a mating surface, and welding points 15 on both sides of the lower upper walls 3 and 4 respectively. ，
Weld 15.

[0017]

According to the present invention, with the above-mentioned structure, the number of welding points 15 is reduced as compared with the conventional box-type crane main girder 12, and the crane main girder can be provided at low cost.

Further, by forming the window 5 in the lower upper walls 3 and 4 of the mating surfaces of the upper and lower columns 1 and 2, the weight of the column-type crane main girder 10 itself is reduced and the mounting operation is simplified.

Further, the horizontal frame portions 16 of the lower upper walls 3 and 4 having the windows 5 formed therein except the windows 5 serve as a horizontal stiffening material to enhance the rigidity of the column-type crane main girder 10 and provide horizontal stiffening. It can be provided at a low price because it does not require wood.

[Brief description of drawings]

FIG. 1 is a side view of a column-type crane main girder of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a bottom view of the upper column.

FIG. 4 is a plan view of a lower column.

FIG. 5 is a vertical cross-sectional view of a main part of a conventional box-type crane main girder in which a transverse rail is mounted on a vertical plate of a box.

FIG. 6 is a longitudinal sectional view of an essential part of the traverse rail, which is attached by being shifted from the vertical plate of the box.

[Explanation of symbols]

 1 Upper column 2 Lower column 3 Lower wall 4 Upper wall 5 Window 6 Column inner wall 7 Stiffening material 8 Reinforcing plate 9 Frame part 10 Column type crane main girder 11 Traverse rail 12 Box type crane main girder 13 Vertical stiffening material 14 Horizontal reinforcement Rigid material 15 Welding point 16 Horizontal frame

Claims (1)

[Claims] A window is provided on each of the lower upper walls of the upper and lower columns,
A column-type crane main girder formed by welding a stiffening material and a reinforcing plate to the inner wall of the column through the window, and welding the upper and lower columns with the lower upper wall as a mating surface.