JPS6320161A - Flange notching method for h-shape - Google Patents

Abstract

PURPOSE:To smooth the cutting work of the flange of an H-shape and to improve the efficiency by locating the notching start point of the flange upper face at equal distance from the web axial line by each flange piece and performing the cutting by inclining to the external side of the web face. CONSTITUTION:In case of notching both the side flanges 2a, 2b of an H-shape by a gas cutting, the notching start points 5a, 5b of the flange upper face are respectively made close to a web 1 axial line and located at equal distance from the axial line by leaving the flat face which is not subjected to the gas cutting between both starting points. The slanting notch line toward the outside is set extending over the flange lower face 4a, 4b of each flange piece from these each notching start point 5a, 5b and the position like cutting off the majority part of the corner parts 7a, 7b of the joining part of respectively adjoining web face 1. And after performing a gas cutting along the slanting notch line from the notching start points 5a, 5b, the remaining parts 7a', 7b' of the corner parts 7a, 7b are shaped with their grinding by a grinder and a smooth cut face is formed.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method for gas cutting when the end flange of an H-shaped steel is notched and inserted into the inner diameter of another H-shaped steel to be used as a column and beam material for a steel structure. This invention relates to a flange notch method for H-beam steel.

[Conventional technology]

Conventionally, when cutting the end flange of an H-shaped steel and inserting it into the inner diameter of another H-shaped steel to make a column and beam material, the first step was to gas-cut the 7 flanges of the H-shaped steel, as shown in the perspective view of Figure 5. Set the cutting torch perpendicularly to the 2 sides of the flange of the H-beam steel, gas cut the flange 2 at a point about 3 mm away from the 1 side of the web, and then cut the flange 2 as shown in the perspective view of Figure 6. After finishing the corner 8 part 7a of 2 and web 1 with a grinder, the remaining 2C of the flange
is gas cut.

In this way, in the conventional cutting method, the corner 8 portion 7a is finished using a grinder to obtain a uniform and good cut surface before cutting the remaining portion. The working time also occupies a large portion of the work involved in notching the flange of H-beam steel.

However, if the flange 2 notch is cut closer to the web surface by approximately 3 mm from the web surface shown in FIG. 5, a large amount of molten slag may adhere to the web surface, and The possibility of cutting notches in the surface increases.

Furthermore, once the cutting notch is inserted, a large amount of work time is required to repair the weld overlay and finish with a grinder. For this reason, as shown in FIG. 5, it is necessary to cut the flange 2 from a direction perpendicular to the flange surface at a position approximately three boundaries away from the surface of the web 1. It is unavoidable that a large amount of work time is required to finish the parts using a grinder.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
The flange of H-beam steel can be cut smoothly and efficiently, and the grinder work can be greatly reduced, molten slag does not adhere to the web surface, there are no notches, and the quality of the flange notch is improved. It is an object of the present invention to provide an improved method for notching a flange of an H-shaped steel.

[Means for solving problems]

To this end, when cutting the flange of H-beam steel by gas cutting, the present invention moves the notch starting points on the upper surface of the flange of both side flange pieces closer to the web axis, leaving a flat surface that will not be gas cut between the two starting points, and away from the axis. at positions equidistant from each other, and inclined outward from the starting point of each of the notches to a position where a majority of the 8 corners of the joints between the lower surfaces of the flange of each of the flange pieces and the respective adjoining web surfaces are removed. A cutout line is set, and each of the flange pieces on both sides is gas-cut along the inclined cutout line.

[For production]

With the above configuration, the starting point of the gas cutting notch is secured on the flat surface of each flange piece, and the majority of the 8 corners of the joint between the flange lower surface and the web surface are removed, and the cut is made on the flange upper surface. It is performed with an inclination from the side near the web axis to the outside of the web surface.

〔Example〕

One embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a schematic diagram showing the method for cutting out the flange of the H-shaped steel of the present invention, and Fig. 2
The figure is a front view of the main part after notching, FIG. 6 is a perspective view of the main part after finishing with a grinder, and FIG. 4 is a perspective view of the main part after cutting off the remaining part of the flange.

In the above figure, when cutting out the flange piece 2a on one side around the web 1 at the end of the H-shaped steel, the position of the notch starting point 5a is the same as the position of the notch starting point 5b when cutting out the flange piece 2b on the other side. 7 lunge upper surface 3a', 3
The position is such that a flat surface 3C can be secured on b.

Therefore, the distance Sa between the notch starting point 5a and the extension line of the web surface 1a is equal to the distance sb between the other notch starting point 5b and the extension line of the web surface 1b.

When the flange piece 2a is gas-cut using a line passing through the contact point 6a between the flange lower surface 4a and the web surface 1a from this notch starting point 5a as the notch line 8a, the flange lower surface 4a and the web surface are cut as shown in FIG. Corner 8 of the joint with 1a
The majority of the portion 7a is removed, leaving only a very small remaining portion 7a.

Next, when the flange piece 2b is gas-cut using the notch line 8b as a line passing through the contact point 6b between the flange lower surface 4b and the web surface 1b from the notch starting point 5b, as shown in FIG. Corner 8 of the joint with surface 1b
The majority part of part 7b is removed and only a very small part 7b' remains.
Only .

In such gas cutting, the cutting angle θa.

θb are equal, the notch starting points 5a and 5b are both secured on the smooth flat surface 6C on the flange upper surfaces 3a and 3b, and the cutting direction is from the web axis toward the outside of the web surface. Moreover, since the cutting lengths are also equal, gas cutting can be carried out smoothly.

After cutting out the seven lunge pieces 2a and 2b in this way,
The remaining portions 7a' and 7b' of the corner 8 are ground and shaped using a grinder to form a smooth cut surface as shown in FIG. 3, and then cut along the cutting lines 9 and 10 as shown in FIG. 7 By gas cutting the notched remaining portions 2c of the flange pieces 2a and 2b, it is possible to obtain an H-shaped steel with a notched flange.

According to this method, the following effects can be achieved.

(1) Each notch starting point 5a, 5b is connected to each flange piece 2a, 2
b is secured on the flat surface 3c, and the cutting length S
A and Sb are also equal.

This allows gas cutting to be carried out smoothly and efficiently.

(2) Flange lower surfaces 4a, 4b and web surface 1a.

Since the majority of the corners 7a and 7b at the joint with 1b are cut off, the grinding work can be greatly reduced.

G] Gas cutting is performed on the web 1 of the flange upper surfaces 3'a and 3b.
Since it is performed with an inclination from the axial center side to the outside of the web surfaces 1a and 1b, molten slag does not adhere to the web surfaces 1a and 1b, and no notch damage occurs, improving the quality of the flange notch. .

〔Effect of the invention〕

In short, according to the present invention, when notching a flange of H-shaped steel by gas cutting, the notch starting points on the upper surface of the flange of both side flange pieces are moved closer to the web axis, leaving a flat surface that will not be gas cut between the two starting points. and from the starting point of each notch to a position where the majority of the 8 corners of the joint between the flange lower surface of each flange piece and the adjoining web surface are cut out. By setting an inclined notch line and gas-cutting each of the flange pieces on both sides along the inclined notch line, the flange of the H-shaped steel can be cut smoothly and efficiently, and the grinder work can be cut by a wide margin. The present invention is industrially extremely useful because it provides a 7-flange notch method for H-beam steel that improves the quality of the flange notch without molten slag adhering to the web surface or notch damage. It is something.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of the method of notching a flange of H-shaped steel according to the present invention, Fig. 2 is a front view of the main part after notching, Fig. 3 is a perspective view of the main part after finishing with a grinder, and Fig. 4 The figure is a perspective view of the main part after cutting off the flange remainder. FIG. 5 and FIG. 6 are perspective views of main parts showing the inside and the after of notching, respectively, in the conventional notching method. 1... Web, 2a, 2b... Flange piece, 3a. 3b...Top surface of flange, 3c...Flat surface of flange, 4a, 4b, bottom surface of flange, 5a, 5b...
・Notch starting point, 6a, 6b... Notch line contact point, 7a,
7b・, Corner 8, 7a, 7b...
Corner R portion remaining, 8a, 8b...notch line, 9.1
0... Cutting line.

Claims (1)

[Claims] When cutting the flange of H-shaped steel by gas cutting, the starting point of the notch on the top surface of the flange of the flange pieces on both sides is
Place them close to the web axis, leaving a flat surface that will not be gas cut between the two starting points, and position them equidistant from the axis.
And an outward inclined notch line is set from the starting point of each of the above-mentioned notches to a position where the majority of the corner R portion of the joint between the flange lower surface of each of the above-mentioned flange pieces and the respective adjoining web surfaces is cut off. A method for cutting a flange of an H-shaped steel, characterized in that each of the flange pieces on both sides is gas-cut along the inclined notch line.