Punching Metal Protective Screens Based on Elements Made of Rolled Sheets and Half Pipes

The object of the study is new design solutions for metal protective screens based on elements made of rolled sheets, half-pipes and guide pipes. Metal protective screens are used in the construction of underground transport structures  using a closed method. The protective screen prevents deformations and subsidence of the surface of overlying soil layers, road and railway bed. During the construction of tunnel-type structures under existing transport communications, the conditions for the safe operation of roads and railways must not be violated. In this case, special attention is paid to subsidence of the overlying soil layers. The magnitude of subsidence affects the possibility to operate roads and reduce the speed or completely stop traffic on the railway. Therefore, the stress-strain state of the proposed metal protective screens was studied using a calculation model developed on the basis of the finite element method. To improve the accuracy of calculating internal for-ces on punching individual structural elements of a metal protective screen, the Romberg method was used. The proposed designs and technologies of protective screens retain the advantages of those currently used, while simultaneously reducing the costs of constructing a protective screen, since the design solutions under study require less effort to push through indivi-dual elements, and, as a consequence, use less powerful equipment. Calculations of the stress-strain state of the proposed designs of protective screens have shown their viability. As a criterion for checking the operability, the maximum stresses perceived by individual parts of the structures were considered; they do not exceed the yield strength of the selected steel, and the maximum vertical and horizontal displacements of individual parts of the screens were calculated, which do not exceed those specified in the requirements of the Rules for Technical Operation of Railways in the Republic of Belarus and the Instructions for Current Maintenance of Railway Tracks in the Russian Federation. This confirms the operability of the proposed metal protective screens.

1. Ilyichev V. A. (ed.) (2004) Guidelines for the Integrated Development of Underground Space in Large Cities. Moscow, Publishing House of State Unitary Enterprise “Research Analytical Center”. 206 (in Russian).

2. Son I. B., Kim V. M., Ananidze G. A., Konkov A. A., Zubov V. A. (2012) Protective Screen Section. Patent Russian Federation no. RU 121860 (in Russian).

3. Son I. B., Kim V. M., Ananidze G. A., Konkov A. A., Zubov V. A. (2013) Method for Creating a Protective Screen. Patent Russian Federation no. RU 2501953 (in Russian).

4. Pribylskaya N. M., Bezugly A. A. (2022) Protective Screen for a Tunnel, or Pipe, or Tunnel-Type Overpass in Loose Soil (Options) and Method of its Construction. Patent BY no. 23710 (in Russian).

5. Pribylskaya N. M. (2023) Protective Screen Made of the Same Type of Elements for Tunnel Construction. Eurasian Patent no. EA042410 (in Russian).

6. Rules for the Technical Operation of the Railway in the Republic of Belarus, Approved by Decree of the Ministry of Transport and Communications of the Republic of Belarus on November 25, 2015 No.52. Available at: https://pravo.by/document/?guid=12551&p0=W21530414p (in Russian).

7. Instructions for the Current Maintenance of the Railway Track, Approved by the Order of JSC Russian Railways dated November 14, 2016 No.2288р. Available at: https://company.rzd.ru/api/media/resources/1503751?action=download (in Russian).

8. Pribylskaya N. M., Grechukhin V. A. (2022) Stress-Strained State оf а Protective Screen Made оf Pipes аnd Base Elements in Underground Construction. Metro i Tonneli [Subway and Tunnels], (1), 9–13 (in Russian).

9. SN [Construction Norms] 3.03.01–2019. Bridges and Pipes. Minsk, Minstroiarkhitektury, 2020. 286 (in Russian).

10. Kurochka P. N., Revyakin A. A., Son I. B., Kopylov A. B. (2015) Construction of Intersections at Different Levels of Existing Railways and Highways Without Stopping Train Traffic. Transportnoye Stroitelstvo = Transport Construction, (4), 14–17 (in Russian).