Abstract

The present invention provides a coupling metal fitting for mutually coupling flanges of adjacent earth retaining members in which a plurality of coupling holes are formed in the flanges, the coupling metal fitting comprising a coupling metal fitting body portion, an insertion portion to be inserted into a coupling hole formed in a flange, and a clamping portion to clamp an edge of a flange together with the coupling metal fitting body portion. The insertion portion is formed so as to be inclined by a prescribed angle to the direction of extension of the coupling metal fitting body portion so that the lateral edge of a step portion joining the coupling metal fitting body portion and the insertion portion abuts the opening edge of a coupling hole when the coupled adjacent flanges are displaced relative to each other in the radial direction of a drilled hole, and such that the angle between the insertion portion and the step portion is an acute angle. A leading end portion of the insertion portion contacts a flange when the insertion portion is attached to said flange and flanges are coupled to each other.

IPC Classes  ?

• E21D 5/10 - Lining shaftsLinings therefor with iron or steel in the form of tubbing
• E02D 29/05 - Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location lineMethods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench