JPH07217215A - Assembling hardware for cast temporary structure - Google Patents

Abstract

PURPOSE:To facilitate the fitting work of a structural steel member, by providing a hollow to contain one side of an angle steel when the other side thereof is held by a fastening bolt and a support. CONSTITUTION:A metal fitting body 2 is made to have a nearly C-shaped form and a fastening bolt 4 is screwed in one side 3 of the C-shaped form and a support part 6 oppositely positioned against the bolt 4 is provided at the other side thereof. Since the fitting body 2 is constituted to have a nearly C-shaped form and one side 3 thereof is formed long to provide a screw hole 8, the bolt 4 is prevented from breaking and the hollow 7 is formed. When a H-shaped steel 20 and one side 21a of an able steel 21 are held by the support part 6 and fastened with the bolt 4, even if the other side 21b of angle steel 21 is erected, the side 21b is contained without obstacles and the steel 20 can be fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting temporary structure assembling metal fitting for mounting an H-shaped steel and a chevron steel used as structural steel materials when assembling a temporary structure.

[0002]

2. Description of the Related Art Conventionally, when assembling a temporary structure, it has been general to fix each structural steel material by welding, bolt fastening, or a combination of welding and bolt fastening. However, in order to fix the above steel materials by welding, only a specialized worker can work,
In addition, the work itself takes time. Disassembling is also troublesome, and there is the inconvenience that the melted steel material cannot be reused in many cases. In addition, when fastening with bolts, it takes time to align the hole positions of the bolts, and if the hole positions are misaligned, there is the inconvenience that the holes must be opened again. When the steel material is fixed by using the above welding and bolt fastening together, the above-mentioned various inconveniences occur at respective points.

Therefore, in order to eliminate the above-mentioned various inconveniences, as shown in FIG. 3, screw portions 31, 31 are provided at both ends of a body portion 30 formed in a substantially U shape, and the screw portions 3 are formed.
There is provided a forged assembly fitting configured so that bolts 32 and 32 are screwed into 1 and 31 respectively, and a structural steel material is sandwiched between the bolts 32 and 32 and tightened and fixed.

[0004]

However, since the above-mentioned conventional forged assembly metal fittings are formed by forging, the weight is heavy and the strength is insufficient. Also, since it deforms plastically with a small amount of force, when it is used for heavy temporary structures due to low clamping force, it is possible to secure the safety of the assembled temporary structure, which is the most important because the joint part becomes loose. There wasn't.

When assembling a temporary structure, H-shaped steel as structural steel is used for columns and girders, and angle steel is used for horizontal or vertical braces. Referring to FIG. 2, a chevron steel 21 that is a horizontal or vertical brace is attached in an X shape between two H-beams 20 and 20 that are columns or girders.
At the time of mounting, on the acute angle side 1A of the mounting portion A,
The angle becomes small and the conventional U-shaped metal fitting may not be used. Then, the angle steel 21 is changed to the H-shaped steel 2 from the side 2A having a large angle on the opposite side by the U-shaped metal fitting.
If you try to fix it to 0, you will have to fasten it over the rising part of the angle steel, so if the protruding length of the bolt becomes long and a large load is applied to the temporary structure itself,
There is an inconvenience that the strength is insufficient and the bolt is broken.

The present invention has been proposed in view of the above, and an angle steel is X-shaped between two H-shaped steels arranged at intervals.
The purpose of the present invention is to obtain a particularly effective casting metal fitting for a temporary structure when it is attached in a letter shape.

[0007]

In order to achieve the above object, the casting metal fitting for a temporary structure of the present invention has a metal fitting body formed in a substantially C shape, and one end portion side of the C shape is formed. The fastening bolts are screwed together, the other end side is provided with a support portion facing the above fastening bolts, and when one side of the angle steel is sandwiched by the above fastening bolt and the support portion, the other side of the angle steel is The recess to be included is formed in the metal fitting body.

Then, the above metal fitting body is set to C: 3.0-
4.0 wt%, Si: 2.0-3.5 wt%, Mn: 0.1
˜0.7 wt%, or even Cu: 0.1
2.0 wt%, Ni: 0.1 to 2.0 wt%, Mo: 0.0
5 to 0.5 wt% of one or more,
The balance is made of ductile cast iron consisting essentially of Fe and trace impurities, and after holding at 820 to 950 ° C for 0.5 to 5 hours, it is immediately cooled to 280 to 360 ° C and kept at that temperature for 0.5 hours or more. Austempered.

[0009]

With the above structure, the angled steel is provided along the H-shaped steel, and the H-shaped steel and one side of the angled steel are screwed to one end side of the metal fitting body formed in a substantially C shape. And the support portion formed on the other end side, the other side of the angle steel is raised even if it is inserted, so that the H-shaped steel and the angle steel are jointly tightened. Can be fixed.

The metal fitting body has a C: 3.0 to 4.0 wt.
%, Si: 2.0 to 3.5 wt%, Mn: 0.1 to 0.7
wt% or further Cu: 0.1-2.0 wt
%, Ni: 0.1-2.0 wt%, Mo: 0.05-0.
Austempered spheroidal graphite cast iron containing 5% by weight or more of 1 wt% or more and the balance substantially consisting of Fe and trace impurities has high strength, and even when used in heavy temporary structures, the joint It is safe because it does not come loose, and can be integrally molded because it is cast, and molding is easy. Moreover, because of its high strength, the wall thickness can be made thin and the size can be reduced, and the overall weight can be reduced.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a front view showing a state in which an angle steel 21 is attached to an H-shaped steel 20 by using the casting temporary structure assembling metal fitting 1 of the present invention. As shown in the figure, in the assembled metal fitting 1 of the present invention, the metal fitting body 2 is formed in a substantially C shape, the fastening bolt 4 is screwed to one end side 3 of the C shape, and the other end side 5 is formed. When the one side 21a of the chevron steel 21 is sandwiched between the fastening bolt 4 and the support portion 6, the concave portion that encloses the other side 21b of the chevron steel 21 is provided. 7 is formed on the metal fitting body 2 described above.

The metal fitting body 2 is formed into a substantially C-shape by casting, as will be described later. When the one end side 3 into which the fastening bolt 4 is screwed is formed long and the screw hole 8 is drilled, the fastening bolt is formed. 4 can be prevented from breaking. Since the concave portion 7 can be formed by forming the C-shaped one end portion side 3 to be long, the H-shaped steel 20 and the one side 21a of the angled steel 21 are received by the support portion 6 and the fastening bolt 4 is used together. When tightened, even if the other side 21b of the angle steel 21 is in the established state, the one side 21b is not included in the recess 7 and becomes an obstacle. Reference numeral 9 is a rib for preventing the metal fitting body 2 from being twisted.

If the casting temporary structure assembly metal fitting 1 according to the present invention is used, the rising side 21b of the angle steel 21 as described above.
Since the angle steel 21 can be attached to the H-shaped steel 20 in a state where the angle steel 21 is straddled,
There is no problem even when the angle steel 21 is attached in the X shape between the H-shaped steels 20 and 20 of the book.

The metal fitting body 2 has C: 3.0.
.About.4.0 wt%, Si: 2.0 to 3.5 wt%, Mn: 0.
1 to 0.7 wt%, or further Cu: 0.1
2.0 wt%, Ni: 0.1 to 2.0 wt%, Mo: 0.0
5 to 0.5 wt% of one or more,
The balance is made of ductile cast iron consisting essentially of Fe and trace impurities, and after holding at 820 to 950 ° C for 0.5 to 5 hours, it is immediately cooled to 280 to 360 ° C and kept at that temperature for 0.5 hours or more. Austempering is performed.

C: 3.0 to 4.0% by weight means that if it is less than 3.0%, chilling tends to occur, and if it exceeds 4.0%, dross increases when spheroidized. The reason why Si: 2.0 to 3.5 wt% is that if less than 2.0%, chilling is likely to occur and the castability becomes poor, and if too much, the graphite becomes coarse and the toughness decreases, so 3.5. % Or less, and Mn: 0.1 to 0.7 wt% is because if less than 0.1%, the hardenability during heat treatment is poor and 0.7
If it exceeds%, segregation at the boundary of the eutectic cell becomes remarkable and the toughness is lowered.

Cu: 0.1 to 2.0 wt% is an effective element because it has an effect of promoting bainite formation.
If it is less than 0.1 wt%, the effect is small. This is because if it exceeds 2.0%, the toughness decreases, and Ni: 0.1 to 2.0 wt% is an effective element because it has a banitizing promoting effect, but 0.1% If less than, the effect is weak. This is because if it exceeds 2.0%, the toughness decreases, and Mo: 0.05-
0.5 wt% is an effective element because it has a bainite promoting effect, but if it is less than 0.05%, the effect is small. This is because if it exceeds 0.5%, the toughness decreases.

The austenitizing temperature and time are set to 820 to 950 ° C. for 0.5 to 5 hours.
If the austenitizing temperature is lower than 20 ° C., uniform austenite cannot be obtained, and if the temperature exceeds 950 ° C., the amount of C dissolved in austenite increases, and the toughness after austempering decreases. This is because if the holding time is not less than 0.5 hours, uniform austenite cannot be obtained, and if it exceeds 5 hours, the austenite crystal grains become coarse and the mechanical properties deteriorate.

Further, the austempering temperature and time are set to 280 ° C. to 360 ° C. for 0.5 hours or more.
If it is less than 280 ° C, the toughness is low, and if it exceeds 360 ° C, the strength is low. This is because if the holding time is less than 0.5 hours, the isothermal transformation is not sufficiently performed and a complete bainite structure cannot be obtained.

When the metal fitting body 2 is formed as described above, since it has high strength, it can be made thin and lightweight. Further, since it can be integrally molded, it is easy to manufacture.

[0020]

As described above, in the casting temporary structure assembly metal fitting of the present invention, the metal fitting main body is formed in a substantially C-shape, and the fastening bolt is screwed to one end of the C-shape. A support portion facing the above fastening bolt is provided on the end side, and when one side of the angle steel is sandwiched by the above fastening bolt and the support portion, a recess containing the other side of the angle steel is formed into the above metal fitting body. Therefore, by using the assembly metal fitting of the present invention, it is possible to easily attach the angle steel to the X shape between the two H-shaped steels arranged at intervals.

Further, the metal fitting body has C: 3.0 to 4.0 wt.
%, Si: 2.0 to 3.5 wt%, Mn: 0.1 to 0.7
wt% or further Cu: 0.1-2.0 wt
%, Ni: 0.1-2.0 wt%, Mo: 0.05-0.
Austempered spheroidal graphite cast iron containing 5% by weight or more of 1 wt% or more and the balance substantially consisting of Fe and trace impurities has high strength, and even when used in heavy temporary structures, the joint It is safe because it does not come loose, and can be integrally molded because it is cast, and molding is easy. Moreover, because of its high strength, it can be made thin and compact, and can be made light in weight as a whole. Therefore, various inconveniences that have occurred in the past can be solved well, and it is effective and suitable as an assembly fitting of this kind.

[Brief description of drawings]

FIG. 1 is a front view showing a use state of an assembly fitting of the present invention.

FIG. 2 is a perspective view showing a preferred use position of the assembly metal fitting of the present invention.

FIG. 3 is a front view of a conventional assembly fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Assembly metal fitting 2 C-shaped metal fitting body 3 C-shaped one end side 5 C-shaped other end side 4 Fastening bolt 6 Support portion 7 Recessed portion 20 H-shaped steel 21 Angle steel

Claims (2)

[Claims] 1. A metal fitting body is formed into a substantially C-shape, a fastening bolt is screwed into one end of the C-shape, and a support portion facing the above-mentioned fastening bolt is provided on the other end thereof. An assembly metal fitting for a cast temporary structure, characterized in that, when one side of the angle steel is sandwiched between the fastening bolt and the supporting portion, a recess containing the other side of the angle steel is formed in the metal body. 2. The metal fitting body comprises C: 3.0 to 4.0 wt% and S
i: 2.0-3.5 wt%, Mn: 0.1-0.7 wt%, or further Cu: 0.1-2.0 wt%, N
i: 0.1 to 2.0 wt%, Mo: 0.05 to 0.5 wt%
One or more of these are contained, and the balance is made of ductile cast iron consisting essentially of Fe and trace impurities,
The casting temporary structure according to claim 1, wherein after being held at 820 to 950 ° C. for 0.5 to 5 hours, it is immediately cooled to 280 to 360 ° C. and subjected to an austempering treatment for holding at that temperature for 0.5 hour or more. Assembly metal fittings.