Abstract
The article discusses modern technologies for the construction of shallow underpass pedestrian tunnels (UPTs) built under existing transport highways. A technology for building such tunnels is proposed, in which, at the first stage, a tongue-and-groove fence is indented across the carriageway along the grapples, which will serve as the enclosing structure of the tunnel. Then, support beams and a monolithic cladding are arranged along its ends, along which, after gaining strength, traffic can be allowed to resume its motion. The effective modes of steel sheet piling immersion and its fastening systems are substantiated, which allows ensuring the stability of tunnel structures and reducing technological impacts on the roadway surface. The works on the soil development, the installation of the tunnel foundation, waterproofing and drainage system, as well as finishing works will be carried out under the tunnel floor without traffic having to be stopped. Based on the performed technical and economic calculations, it was found out that the proposed technology, compared with the traditional one implemented in an open pit, allows reducing the duration of traffic stops by 2 times, and, when using prefabricated tunnel elements, it will be by 1.18 times. The total duration of work is reduced by 1.38 times. The article presents the technological schemes of work production, lists of machines and equipment necessary for the practical implementation of the method.
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