Free Donut Zero Structural Materials-FD420Ns

Free Donut Zero Structural Materials
Asahi Kasei Construction Materials Co., Ltd.

Asahi Kasei Construction Materials Co., Ltd.'s Response Status

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100.0%

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Company Review

4.8

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About This Product

Free Donut is a web through-hole reinforcement method for steel H-beams. Two free donuts reduce the burden during construction and enable economical design.

A female threaded ring is fitted onto a male threaded sleeve tube from both sides of the web using screw action, and the dedicated welding hole provided in the ring is plug welded to reinforce the beam through hole. The uniform and small amount of welding minimizes the distortion of the beam and has a great reinforcement effect. For φ420 to 580 sizes that do not use sleeves, we have added one-sided reinforcement to the lineup.

The combination of Free Donut Eight and Free Donut Zero enables economical design.

Features
■Reducing weight and welding amount・Free donuts enable effective reinforcement with less welding compared to conventional methods. The ring, which is lighter in proportion to its reinforcement effect, reduces the burden on the installer and contributes to improved work efficiency.
・Free Donut Zero uses a unique method of plug welding the holes in the product, which enables reinforcement with less welding than conventional methods.

■The performance of the beam through hole part is clear.・This is a construction method that has received a general rating from the Japan Building Center.
・The perforated section strength is determined based on many full-scale experiments and FEM analysis, making it easy to examine the seismic resistance of beams with through holes.

■Rational equipment design is possible.The distance from the beam end and beam top, as well as the spacing between through holes, can be reduced, expanding the range in which through holes can be installed to match equipment planning. (Separate strength study and regulation confirmation are required.)

*Other product numbers are available.

Model
There are 10 models for this product.

Product
Free Donut Zero Structural Materials

Handling Company
Asahi Kasei Construction Materials Co., Ltd.

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10 Models of Free Donut Zero Structural Materials

Click on the part number for more information about each product

Part Number	Price (excluding tax)	Fillet weld size Plug weld hole location	Fillet weld size Plug weld hole Hole diameter R1 (R2) mm	Weight kg	Through hole diameter d (nominal diameter)	Plate thickness mm	Material	Outer diameter Dr mm	Inner diameter (d) mm	Specification	Sleep length Ls mm
FD420Ns	Available upon quote	12	Φ31 (42)	17	Φ420	16	FD ring: SM-FD490A2, SM-FD490A3 Certified by the Minister of Land, Infrastructure, Transport and Tourism MSTL-320,MSTL-0579	604	420	Standard specification (one side reinforced)	-
FD500Ns	Available upon quote	12	Φ37 (50)	27	Φ500	19	FD ring: SM-FD490A2, SM-FD490A3 Certified by the Minister of Land, Infrastructure, Transport and Tourism MSTL-320,MSTL-0579	704	500	Standard specification (one side reinforced)	-
FD580Ns	Available upon quote	12	Φ37 (50)	36	Φ580	19	FD ring: SM-FD490A2, SM-FD490A3 Certified by the Minister of Land, Infrastructure, Transport and Tourism MSTL-320,MSTL-0579	804	580	Standard specification (one side reinforced)	-
FD100N	Available upon quote	4	Φ20	3	Φ100	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	181	102	High strength specification (reinforced on both sides)	60
FD125N	Available upon quote	4	Φ20	3.8	Φ125	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	207	127	High strength specification (reinforced on both sides)	60
FD150N	Available upon quote	4	Φ23	5.8	Φ150	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	256	151	High strength specification (reinforced on both sides)	60
FD175N	Available upon quote	8	Φ23	7.8	Φ175	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	300	175	High strength specification (reinforced on both sides)	60
FD200N	Available upon quote	8	Φ23	10	Φ200	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	346	200	High strength specification (reinforced on both sides)	60
FD250N	Available upon quote	8	Φ23	13	Φ250	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	396	249	High strength specification (reinforced on both sides)	60
FD300N	Available upon quote	8	Φ23	18	Φ300	9	FD ring: SM490A (JIS G 3106) FD sleeve: STK400 (JIS G 3444)	470	298	High strength specification (reinforced on both sides)	60

Click on the part number for more information about each product

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About Company Handling This Product

Asahi Kasei Construction Materials Co., Ltd.

Response Rate

100.0%

Response Time

4.7hrs

Company Review

4.8

Japan

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Free Donut Zero Structural Materials Asahi Kasei Construction Materials Co., Ltd.

Asahi Kasei Construction Materials Co., Ltd.'s Response Status

About This Product

■Reducing weight and welding amount

■The performance of the beam through hole part is clear.

■Rational equipment design is possible.

10 Models of Free Donut Zero Structural Materials

Other products of Asahi Kasei Construction Materials Co., Ltd.

About Company Handling This Product

Free Donut Zero Structural Materials
Asahi Kasei Construction Materials Co., Ltd.