Title:
廻り階段用縦ささら材、及び、廻り階段の施工方法
Document Type and Number:
Japanese Patent JP7085713
Kind Code:
B2
Abstract:
To provide a construction method of a spiral stairway capable of constructing with only a wholly precut material in construction of a spiral stairway and constructing a spiral stairway in a short period of time extremely efficiently, and to provide a vertical string material used in the method.SOLUTION: A vertical string material for a spiral stairway has a vertically long shape, is formed to have an L-shape in a planar shape, and is constituted of a downstairs side portion 13 extending from an external corner portion 11 and an internal corner portion 12 toward downstairs side, and an upstairs side portion 14 extending toward an upstairs side. On an outside surface of the downstairs side portion 13, a first cutout groove 13a capable of making an inside end portion of a middle stage spiral step plate enter from the external corner portion 11 side to a direction of a downstairs side end edge 15 and supporting is formed. On an outside surface of the upstairs side portion 14, a second cutout groove 14a capable of making an inside end portion of an upper stage spiral step plate enter from an upstairs side end edge 16 side to a direction of the external corner portion 11 and supporting is formed at a position of a height which is higher than the first cutout groove 13a of the downstairs side portion 13 by one step of a stairway.SELECTED DRAWING: Figure 1
Inventors:
Mitsunori Ohno
Application Number:
JP2019108619A
Publication Date:
June 17, 2022
Filing Date:
June 11, 2019
Export Citation:
Assignee:
Dm Wood Lab Co., Ltd.
Yamashita Corporation
Daito Trust Co., Ltd.
Yamashita Corporation
Daito Trust Co., Ltd.
International Classes:
E04F11/025; E04F11/02
Domestic Patent References:
| JP3151452A | ||||
| JP7217133A | ||||
| JP2003278342A | ||||
| JP11181980A | ||||
| JP2015209693A |
Attorney, Agent or Firm:
Akihiro Takeda