EVA Method constructing structure of ethylene vinyl acetate waterproof sheet attaching to non-oven fabrics by a heat fuse on the tunnel shot-crete

摘要

The present invention relates to an integrated waterproof sheet construction method using a structure of an ethylene vinyl acetate (EVA) sheet of an integrated waterproof sheet, wherein the integrated waterproof sheet is formed by hot melting of the EVA sheet having a drain protrusion formed thereon and non-woven fabric to improve a water flowing cross section and drainage efficiency, and groundwater of a stabilizer is normally drained by the drain protrusion without being remained even if the non-woven fabric is occluded by fine particles while being adapted to drainage of the groundwater in an early excavation stage. More specifically, provided are an attachment strength reinforcing function and an extended drainage function at the same time. A central hot melting surface section is longitudinally formed at the center of a short lateral direction of the EVA sheet and a plurality of hot melting surface sections are symmetrically formed on both sides at a predetermined interval with respect to the central hot melting section to extend an attachment area, such that the attachment strength reinforcing function in accordance with extension of the attachment area solves a problem that the non-woven fabric is delaminated by point welding of the existing integrated waterproof sheet. A drainage cell (cf) fills between the hot melting sections excluding the hot melting section and a fine guided water path groove (b) is formed between the drainage protrusions of the drainage protrusion cell (cf) while forming a unit assembly cell (U) with vertical and horizontal drains (B, D) surrounding four sides of the drainage protrusion cell (cf), such that a water flow cross section is extended through a plurality of drainage paths, and thus the extended drainage function is provided to the EVA sheet structure.