BS 227:1995 pdf download.H-section steel arches for use in mines.
1 Scope This British Standard specifies requirements for H-section steel arches for use in underground roadways in mines. This standard applies to semi-circular and double radiused profile arches and cambered and flat-top arches. This standard excludes H-section steel arches used in roadway junction structures. In addition to the definitive requirements, this standard also requires the items detailed in 6.1, 6.2, 7.1 and 7.5 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied. NOTE Dimensions on figures are in millimetres.
2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments.
4 Information and requirements to be agreed and to be documented
4.1 The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made and verified: a) for double radiused arches, the support base width (see 6.2); b) for cambered and flat top arches, the beam lengths and support heights (see 7.1).
4.2 The following item to be agreed between the contracting parties which are specified in the clauses referred to shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented item shall be satisfied before a claim of compliance with the standard can be made and verified. For all H-section members, the requirement, if any, for strut holes (see 6.1, 6.2 and 7.5).
6 Semi-circular and double radiused arches 6.1 Semi-circular arches Semi-circular arches shall be of a semi-circular profile with parallel legs, or splayed legs inclined at between 6° and 6° 4½ to the vertical, and shall conform to the parameters specified in Table 3 and illustrated in Figure 6. They shall have joints positioned by reference to a) the number of members per arch, b) the crown angle and c) the chord length, all as specified in Table 3 and illustrated in Figure 6.
BS 227 pdf download.