JP2011162992A - Multi-layer lightweight h-shaped steel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide inexpensive lightweight H-shaped steel for use in a steel structure of a structure and a low-rise building, etc., which has efficient cross-sectional performance, that is, high cross-sectional performance per mass, and which dispenses with rust-proof coating. <P>SOLUTION: This multi-layer lightweight H-shaped steel is characterized as follows: a width-direction portion of a long preplated steel plate is formed by being bent in an approximately H-shaped cross section; a flange, which has the steel plate superposed by being folded back at an angle of 180° from a leading end of the approximately H-shaped cross-section flange, and a central portion of an outside web 3 are each made of a veneer; a bent shape of an inside flange 2 and that of a corner of each of the webs (3 and 4) are curved; the inside webs 4 formed near both side ends of the long side of the steel plate are pressure-bonded by abutting on U-shaped plate pieces 5 protruding in parallel with the outside web 3 at a predetermined interval, respectively; and a rectangular hole 6 formed in plate piece working is provided on the center line of the outside web 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention is a lightweight H-shaped steel material used for a steel structure of a building or a low-rise building, has an efficient cross-sectional performance, is formed by bending a plated steel plate without welding, and is excellent in economic efficiency. The present invention relates to a lightweight H-shaped steel material.

2. Description of the Related Art Conventionally, H-section steel used for structures and steel structures of buildings is formed into a predetermined cross-sectional shape in a hot rolling process at a steel mill. When beam is manufactured at a steel frame manufacturing factory, H-shaped steel is cut into a predetermined length, drilled, and then rust-proofed or plated if necessary. It is common. In recent years, in response to cost reduction, a welded H-shaped steel (a flange material and a steel plate of a web material are continuously joined by high-frequency welding) is used for a steel frame of a low-rise building.

However, for the welded H-section steel, the base plate such as the plated steel strip, which is continuously fed, is positioned with the upper, lower, left and right rolls, and is welded with high frequency while pressing. The thickness and dimensions of the H-section steel are required. Depending on the situation, the roll is changed and manufactured. For this reason, it takes a great amount of roll costs and roll replacement time to produce various types of dimensions, resulting in an increase in equipment costs and a decrease in production efficiency. Therefore, a web formed by caulking and joining a pair of C-shaped steel bars back to back, and a flange extending in the opposite direction from both ends of the web, a reinforcing flange is provided on the whole or a part of the flange along the longitudinal direction. An assembled H-section steel characterized by being crimped is disclosed in Japanese Patent Application Laid-Open No. 2007-186939 (first known example).

Next, in Japanese Patent Application Laid-Open No. 2002-004495 (second known example), a pre-plated steel plate is bent to form a beam member, the webs of the pair of beam members are overlapped, and the webs are joined together. A method is disclosed in which the beam members are integrated by caulking and are less likely to buckle.

Further, in Japanese Patent Application No. 2009-261463 (third known example), the width direction of the long steel plate is bent into a substantially H-shaped cross-section, and then folded back 180 degrees from the front end of the flange having the substantially H-shaped cross-sectional shape. There is disclosed a double flange lightweight section steel characterized by a double steel sheet flange and a light H-section steel whose central portion is composed of a single sheet.

Further, in Japanese Patent Application Laid-Open No. 11-040443 (fourth known example), a metal plate is provided at least in an end portion in the longitudinal direction of a main body portion formed into a shape steel material by bending a belt-like metal plate along the longitudinal direction. There is disclosed an architectural frame member characterized in that overlapping overlapping portions are formed and a connector is tightly fixed between metal plates of the overlapping portions.

JP 2007-186939 A JP 2002-004495 A Japanese Patent Application No. 2009-261463 JP 11-040443 A

However, in the H-section steel according to the first to fourth known examples, various problems may occur in the quality at the time of manufacturing the H-section steel member and the connection stability of the overlapped portion.

First, in the case of the first known example, it can be evaluated that the cross-sectional performance per unit mass is high with an efficient cross-sectional shape, but long light grooved steels are back to back and at intervals of 100 mm in the longitudinal direction. Caulking is performed, and reinforcing flange strips are installed on the upper and lower sides of both flanges to perform caulking. However, this method is easy to cause defects because each member is assembled. For example, when the roll forming of light grooved steel is cut, the cross section is slightly deformed, and the bending angle of the flange portion and the web is slightly different at the center and end of the shaped steel. If strips are installed on the top and bottom of the flange and caulking is performed, the strips follow the cross-sectional shape of the light groove steel, causing bending of the member. In addition, the steel plates at the locations joined by caulking are tightly attached, but the steel plates at the portions not subjected to caulking are in a floating state, and each condition is different, so dimensional errors and bending of parts after assembly Problems such as twisting are likely to occur, and quality problems are expected.

Next, in the case of the second known example, the plate thickness of the flange portion of the member cross section is half that of the web portion. Therefore, the area effective for the secondary moment of section, that is, the area of the flange portion that is the farthest from the neutral axis of the member is extremely small, and the sectional performance per unit mass (member sectional area × mass) is low. For this reason, it is particularly expensive when used as a beam material.

Subsequently, in the case of the third known example, since the plate thickness of the flange portion is twice the web plate thickness and the cross-sectional shape is efficient, it can be evaluated that the cross-sectional performance per mass is high. However, since the bending R dimension of the corner of the flange and the web is formed at 1 t (1 times the plate thickness), the buckling strength is lowered. Moreover, a manufacturing method, for example, a fixing method between webs to be polymerized is not disclosed.

Further, in the case of the fourth known example, while forming a superposed portion where the metal plate overlaps at least the end portion in the longitudinal direction of the main body portion formed into a shape steel material shape by bending the belt-like metal plate along the longitudinal direction. The connection tool is narrowly fixed between the metal plates of the superposed portion. That is, the connection reinforcement and stability of the members are disclosed for the main purpose, and since the specific manufacturing method is not disclosed, the manufacturing method remains unclear. However, since the shape is complicated, a large amount of equipment costs and processing time ( Production efficiency), dimensional accuracy, quality control, etc. may occur, and high costs are expected.

  As a result of studying to solve the above problems, the inventor of the present invention has overlapped a portion effective for the cross-section secondary moment, that is, two sheets of the flange and the web part of the web that are the farthest from the neutral axis of the member. It is desirable to double the cross-sectional area and to increase the buckling strength by making the corner bend shape of the inner flange and each web a large curve. Therefore, a lightweight H-section steel with an efficient cross-sectional shape and high cross-sectional performance can be obtained, and furthermore, by using a pre-plated steel plate, the painting process can be omitted, and the integrated web is integrated. As a means of this, the long inner web is fixed by crimping with a plate piece on the outer web at a predetermined interval to eliminate the need for rust prevention coating (in the case of welding joining, repair of the plating layer is required). I came up with what I can do. The gist is as follows.

(1) A flange in which the width direction of a pre-plated long steel plate is bent into a substantially H-shaped cross-section, and the steel plate is overlapped by bending 180 degrees from the front end of the flange having the substantially H-shaped cross-section, and an outer web The inner web is formed of a single plate, the bent shape of the inner flange and each corner of the web has a curve, and the inner web formed in the vicinity of both side edges of the long side of the steel plate has the outer side at a predetermined interval. A U-shaped plate piece projecting in parallel to the web is pressed against the U-shaped plate piece, and has a rectangular hole formed at the time of processing the plate piece on the center line of the outer web. Multi-layer lightweight H-section steel.

(2) A lip and a flange in which the width direction of a pre-plated long steel plate is bent and formed into a substantially H-shaped cross-section, and the steel plate is superposed by bending 180 degrees from the lip end of the substantially H-shaped cross-sectional shape; The center portion of the outer web is formed of a single plate, the bent shape of the inner flange and the corner of each web has a curve, and the inner web formed in the vicinity of both ends of the long side of the steel plate has a predetermined interval. A U-shaped plate piece projecting in parallel to the outer web and pressed against the U-shaped plate piece, and has a rectangular hole formed during the processing of the plate piece on the center line of the outer web; Multi-layer lightweight H-section steel characterized by

(A) According to the multilayer lightweight H-section steel according to the present invention, the sectional area is doubled by doubling the steel plate such as a flange and a lip at a location effective for the sectional secondary moment. Mentor is getting bigger. Also, the bent shape of the inner flange and the corner of each web is made a large curve, and the vertical portion of the outer web is made as small as possible to increase the buckling strength. Therefore, even with the same external dimensions as the conventional one, the balance of the plate thickness arrangement (corresponding to the stress with the minimum cross-sectional area) is superior to the conventional technique, so an efficient cross-sectional shape is formed. High cross-sectional performance per unit mass (member cross-sectional area × mass) can be obtained. That is, it is rational from the mechanical point of view to increase the thickness of only the portion where the stress is applied, rather than disposing the same thickness steel plate in the entire region, and it is economical because high cross-sectional performance per unit mass is obtained. In view of the direction of the secondary moment of the cross-section, it is particularly effective when used for a steel-structured beam member, a frame material for outer wall panels, and the like.

(B) According to the multilayer lightweight H-section steel according to the present invention, the web joining method in which the pre-plated steel plates are polymerized is different from the conventional connecting methods such as spot welding and caulking. In this technique, a long inner web is brought into contact with a plate piece protruding from the outer web at a predetermined interval, and the plate piece is formed and crimped into a U shape by a press machine or the like. The webs are integrated with each other to enhance the bonding strength. Accordingly, the rust-proof coating is omitted, and the connection strength is increased and stabilized, so that productivity can be increased and manufacturing can be performed at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of the multilayer light weight H-section steel concerning this invention, (a) is AA sectional drawing. It is explanatory drawing which shows the cutting position of a plate piece in a plating long steel plate (plate shape). It is a figure explaining the outline of member allocation by AA sectional drawing of FIG. It is explanatory drawing 1 which shows the processing procedure of a multilayer light weight H-section steel. It is explanatory drawing 2 which shows the process sequence of multilayer light weight H-section steel. It is explanatory drawing 3 which shows the process sequence of multilayer light weight H-section steel. It is explanatory drawing 4 which shows the process sequence of multilayer light weight H-section steel. It is explanatory drawing which shows the processing procedure of the plate piece of a superposition | polymerization part, (a) Sectional drawing and top view before a process, (b) Sectional drawing of steel plate bending (at the time of plate piece generation | occurrence | production), (c) Pre-processing -It is sectional drawing at the time of a piece bending. It is sectional drawing which shows an example of the lip groove H-section steel of the multilayer light weight H-section steel concerning this invention.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 to 9. The material of the lightweight H-shaped steel material is a metal material such as a hot dip galvanized steel plate or a hot 55% aluminum-zinc alloy plated steel plate, and preferably has a thickness of about 1.0 to 3.2 mm, but is particularly limited. is not. The machine to be manufactured is not particularly limited. For example, as a method of forming a lightweight H-shaped steel material, it can be formed by any one of a pultrusion method, a press method, a roll forming method, and the like. In addition, the plate piece processing can be performed by a press machine or by a complex machine facility in which each machine is combined.

Example 1
FIG. 1 is a schematic view showing an example of a multilayer lightweight H-section steel according to the present invention. In this example, it comprises an outer flange 1, an inner flange 2, an outer web 3, an inner web 4, a plate piece 5, a rectangular hole 6 and a bending corner 7. Hereinafter, it demonstrates along this.

FIG. 2 is an explanatory view showing the cutting position of the plate piece in the plated long steel plate (flat plate shape), and FIG. 3 is a cross-sectional view in the width direction of the plated long steel plate, showing the positions of the respective members. ing. First, as shown in FIG. 2, an H-shaped cut-out (partially enlarged view) is arranged at a predetermined position corresponding to the plate piece 5 on the center line of the long plate steel plate width at intervals of about 250 to 400 mm in the longitudinal direction. (Refer to) Processing. The length of the cut line varies depending on the width of the plate piece, but is about 30 to 60 mm along the center line of the web, and the length of each of the other two cut lines is the size of the inner web 4 Depending on the diameter of the bending corner 7, it is about 50 to 100 mm.

Next, as shown in FIG. 4, the inner web 4 is formed by bending a portion corresponding to the bending corner 7 in the vicinity of both ends of the long side of the plated steel plate by 90 degrees. The bending R dimension (radius) value at that time is preferably determined in consideration of the position of the bolt hole for the end joint in the longitudinal direction of the H-shaped steel material and the buckling strength of the web. For example, the bolt hole position (not shown) requires that the plate materials are superposed in parallel, and precisely the nut position (not shown) is required, so the straight portion is large and the R dimension is The smaller one is preferable, but considering the buckling strength, it is preferable that the straight portion is smaller and the R dimension is larger. Therefore, as a guideline, the R dimension of the bending corner 7 is about 4t to 10t (4 to 10 times the plate thickness) although it depends on the shape dimension of the H-shaped steel material. The shape of the desired curved bend radius is not a circle having the same horizontal / vertical ratio, but is preferably a curved line having a different horizontal / vertical ratio. That is, when the flange portion is short and the web portion is long, the hole position of the bolt in the flange portion is sufficiently secured, and the cross-section of the single plate portion of the web becomes small and is difficult to buckle. Thereby, it is possible to cope with the construction surface and stress with a minimum cross-sectional area, and an efficient cross-sectional shape and high cross-sectional performance per unit mass (member cross-sectional area × mass) can be obtained.

Subsequently, as shown in FIGS. 4 to 5, folding is performed 180 degrees from the turning point a as a base point, the outer flange 1 and the inner flange 2 are overlapped, and further, as shown in FIG. Next, as shown in FIG. 7, bending is performed by applying side pressure to the outer flange 1 and simultaneously applying pressure from the upper part to the two corners of the bending corner 7 as shown in FIG. And form into an H shape.

FIG. 8 is an explanatory diagram in which the outer web 3 and the inner web 4 of the overlapping portion are integrated by a plate piece 5. Hereinafter, it demonstrates along this. FIG. 8A is an H-shaped cross-sectional view and a plan view of the plate piece 5 before processing, and a cutting process C is performed on the center line of the web in advance. First, as shown in FIG. 8 (b), the punch 8 is pushed from the side of the outer web 3 directly above the notch line C, the relevant steel plate of the notching work is bent, and the L-shaped parallel plate piece 5 is bent. To form. Next, as shown in FIG. 8 (c), the punch 8 is pushed into the center of the web (center between the plate pieces 5) from the inner web 4 side in the direction of the die 9, whereby the plate piece 5 is A multilayer light-weight H-section steel is produced in which the inner web 4 and the outer web 3 are firmly integrated by being molded and crimped into a U-shape. The size of the multilayer lightweight H-section steel is about 150 to 300 mm in web size, about 100 to 150 mm in flange size, and about 6 to 12 m in length.

(Example 2)
FIG. 9 is a cross-sectional view showing an example of a lip groove H-shaped steel of a multilayer lightweight H-section steel according to the present invention. FIG. 9 shows an outer flange 1, an inner flange 2, an outer web 3, an inner web 4, a lip 10, It consists of a plate piece 5 and a folding line d. Hereinafter, it demonstrates along this.

As shown in FIG. 9, the H shape formed by the molding process described in the first embodiment is further bent at a right angle from the fold line D to produce the lip 10. Then, as shown in FIG. 8, the outer web 3 and the inner web 4 are processed by the above-described procedure in which the plate pieces 5 are integrated, and the lip groove H-shaped multi-layer lightweight H-shaped steel is formed. Steel is produced. The size of the lip groove H-section steel is about 150 to 300 mm in web size, about 100 to 150 mm in flange size, about 20 to 30 mm in lip size, and about 6 to 12 m in length.

As described above, the multilayer lightweight H-section steel according to the present invention is an economical lightweight H-steel material that emphasizes efficient cross-sectional performance and eliminates the need for rust-proof coating. In particular, the utility for the housing industry is extremely large.

DESCRIPTION OF SYMBOLS 1 Outer flange 2 Inner flange 3 Outer web 4 Inner web 5 Plate piece 6 Rectangular hole 7 Bending corner
8 Punch 9 Die 10 Lip A Folding point B Bending point C Cutting line D Folding line

Claims (3)

A pre-plated long steel sheet is bent in the width direction of a substantially H-shaped cross section, and a flange obtained by overlapping the steel sheets by bending 180 degrees from the front end of the flange having the substantially H-shaped cross section, and a central portion of the outer web are The inner web is formed of a single plate, and the bent shape of the inner flange and each corner of the web has a curve, and the inner web formed in the vicinity of both ends of the long side of the steel plate is parallel to the outer web at a predetermined interval. A multi-layer characterized in that a U-shaped plate piece projecting is pressed against and pressed, and has a rectangular hole formed at the time of processing the plate piece on the center line of the outer web. Lightweight H-section steel. The multilayer lightweight H-section steel according to claim 1, wherein the flange tip is inwardly bent into an L shape and has a lip. The width direction of the pre-plated long steel plate is bent to have a substantially H-shaped cross section, and the flange, lip, etc., where the steel plate is superposed, and the central portion of the outer web are composed of a single plate, The bent shape of the web corner has a curve, and the long inner web is fixed with a U-shaped plate piece on the outer web at a predetermined interval, and is rectangular on the outer web center line. The multilayer light-weight H-section steel according to claim 1 or 2, which relates to a method for producing a light-weight H-section steel having a hole having a shape.

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