# US 2019/0376283 A1 · Steel form

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- Number: US 2019/0376283 A1
- Document ID: US20190376283A1
- Status: Published application
- Kind: A1
- Application number: 16/549,310
- Filed: 2019-08-23
- Published: 2019-12-12
- Earliest claimed: 2017-02-28
- Assignees: Takenaka Corporation; Jfe Steel Corporation; Jfe Metal Products Corporation
- Applicants: Takenaka Corporation; Jfe Steel Corporation; Jfe Metal Products Corporation
- Inventors: Takayuki HIRAYAMA; Kazuto NAKAHIRA; Hirokazu NOZAWA; Yuuichirou OKUNO; Takahiro MACHINAGA; Naohiro FUJITA; Hiroto TAKATSU; Kenji YAMAZAKI; Yukio MURAKAMI; Tomohiro KINOSHITA; Takanori SHIMIZU; Seishi WATANABE; Hiroori YASUOKA
- Web page: https://patentgrep.com/patent/US20190376283A1

## CPC

- E04B 1/16: Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material (E04B1/32 - E04B1/36 take precedence)
- E04B 5/04: with beams {or slabs} of concrete or other stone-like material, e.g. asbestos cement (E04B5/08, E04B5/14 take precedence)
- E04B 1/167: {with permanent forms made of particular materials, e.g. layered products}
- E04B 5/40: with metal form-slabs
- E04C 3/293: the materials being steel and concrete (concrete with internal reinforcements or tensioning members E04C3/20)
- E04B 5/10: with metal beams or girders, e.g. with steel lattice girders (E04B5/14 takes precedence)
- E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001})
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)

## Abstract

A steel form is a steel form for forming a binding beam, including: a pair of Z-steels, wherein each of the pair of Z-steels is provided with a bottom plate portion and a side plate portion extending upward from the bottom plate portion, the bottom plate portion has a joining surface for joining the respective bottom plate portions of the pair of Z-steels to each other, and a groove portion allowing concrete placement is formed by the bottom plate portion and the side plate portion of each of the pair of Z-steels

## Claims

### Claim 1

A steel form for steel-framed concrete beam formation, comprising:
a pair of frame members, wherein
each of the pair of frame members is provided with a bottom plate portion and a side plate portion extending upward from the bottom plate portion,
the bottom plate portion has a joining surface for joining the respective bottom plate portions of the pair of frame members to each other, and
a groove portion allowing concrete placement is formed by the respective bottom and side plate portions of the pair of frame members.

### Claim 2 (depends on 1)

The steel form according to claim 1, wherein an allowable bending moment or an allowable shear force of the steel-framed concrete beam is calculated by Equation (1) below:
Fa=FRC+β·FS (Equation 1)
wherein,
Fa: an allowable bending moment or an allowable shear force of the steel-framed concrete beam,
FRC: an allowable bending moment or an allowable shear force of the concrete,
β: a burden factor of an allowable bending moment or an allowable shear force of the steel form, which is 0.5 or less, and
FS: an allowable bending moment or an allowable shear force of the steel form.

### Claim 3 (depends on 1)

The steel form according to claim 1, wherein
a part of the steel-framed concrete beam is joined to a girder, and
the steel form is provided with an end portion on the girder side in a longitudinal direction of the steel form, accommodated in the girder via, a notch formed in a side surface of the girder, and having a length equal to or greater than a cover thickness of the girder.

### Claim 4 (depends on 1)

The steel form according to claim 1, wherein a non-opening member for fixing the pair of side plate portions to each other is provided in a range from an upper end position of the pair of side plate portions to a position below the upper end position by one-third of a height of the pair of side plate portions.

### Claim 5 (depends on 1)

The steel form according to claim 1, wherein the steel form is provided with a flange portion extending outward from an upper end of the side plate portion.

### Claim 6 (depends on 5)

The steel form according to claim 5, wherein the steel form is provided with a reinforcing portion extending downward or upward from an outer end of the flange portion.