| 摘要 |
PURPOSE:To reduce the number of members and work load by assembling stairs from a support base which supports a floor plate at a certain height, an upper stairs unit which is installed on the upper stage side of the support base, and a lower stairs unit which is installed on the lower stage side of the support base. CONSTITUTION:Lower installing pieces 250, 250 of an upper stairs unit 2 and upper installing pieces 300, 300 of a lower stairs unit 3 are made to come into contact with the column 400 of a landing unit 4, bolts 5a, 5a,..., inserted into bolt insertion holes 400a,..., 250a,..., 300a,..., nuts 5b, 5b,... are fitted to tight- connect the lower part of the upper stairs unit 2 and the upper part of the lower stairs unit 3 with the landing unit 4. Besides, the upper installing pieces 200, 200 of the upper stairs unit 2 and a corridor on up-stairs, and the lower installing pieces 350, 350 of the lower stairs unit 3 and a corridor on down-stairs are tight-connected respectively in the same manner. |
