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Wyświetlanie 1-3 z 3
Tytuł:
Production of full-scale experimental modular specimens of the steel and concrete composite cable space frame
Autorzy:
Gasii, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/111113.pdf
Data publikacji:
2017
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
module
tube
plate
hole
welding
bolt
moduł
rura
płyta
otwór
spawanie
śruba
Opis:
The steel and concrete composite cable space frame is a new type of space roof structure that was designed in Poltava National Technical Yuri Kondratyuk University and fully patented. The article presents procedure preparation of prototype of steel and concrete composite cable space frame in full scale. The main focus is on the specifics of the technological operations of preparation and production of steel and concrete elements of the structure. There is technological sequence of operations in the article also. The full-scale experimental structure consists of the space steel and concrete composite modules and flexible modular steel elements, which are combined with each other via single-bolt connections. The space steel and concrete composite module consists of monolithic reinforced concrete slab and a structural lattice that is made from steel tubes. Production of steel parts of structure were carried out at the factory of building structures and concrete performed under conditions close to those of the construction site.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2017, 3-4; 13-17
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal support design for galleries located in poor quality rock mass and under the influence of mining works
Autorzy:
Vazquez-Silva, Daniel
Prendes-Gero, Maria-Belen
Álvarez-Fernández, Martina-Inmaculada
González-Nicieza, Celestino
Laín-Huerta, Carlos
López-Gayarre, Fernando
Powiązania:
https://bibliotekanauki.pl/articles/1853849.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beton natryskowy
śruba
łuk stalowy
support design
back analysis
numerical implementation
bolt
shotcrete
yieldable steel arch
Opis:
In this work, the sup port of two general galleries located in poor quality rock mass and subjected to the influence of high thickness coal layer exploitations is designed and optimized. The process is carried out in four phases:A first preliminary support is defined employing different geomechanical classifications and applying the New Austrian Tunnelling Method (NATM) using bolts and shotcrete.An instrumentation campaign is carried out with the goal of analysing the behaviour of the support. The study noticed the failure of the support due to the time of placement of the different elements.A back-analysis using the Flac and Phases software has allowed the evaluation of the properties of the rock mass and the support, the study of the influence of the time of placement on the component elements (bolts and shotcrete), and the redefinition of that support.Subsequently, a new support is designed and optimized through numerical modeling after the start of mining without experience in these sizes of sublevel caving that caused the failure of the previously designed support. The new support is formed by yieldable steel arches that are more suitable to withstand the stresses generated by nearby mining work.
Źródło:
Archives of Mining Sciences; 2020, 65, 4; 851-867
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supporting problems at an island mining face in Shanxi, China. Case study based on field observation
Autorzy:
Feng, Xiaowe
Powiązania:
https://bibliotekanauki.pl/articles/2064428.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
coal mine support
bolt
support optimization
field observation
support failure
podparcie w kopalni węgla
śruba
optymalizacja podparcia
obserwacja terenowa
uszkodzenie podparcia
Opis:
In this paper, field observation is conducted in Fujiaao Coal Mine, Linfen city in Shanxi province, China, which is unique because of its island-typed mining layout. Firstly, geology, layout of the coal cutting face, supporting pattern are presented and details are also provided. Then the problems are discussed and analyzed based on existing bolting theories. It finds out the length of the cable bolt is too long, which requires long time to drill boreholes, whilst the effectiveness is limited due to the illogical combination between cable bolt function zone and rock bolt function zone. Also, the face place allocated to rock bolt is very likely to cause line contact between its edge and steel belt, thus the bearing force is tremendously weakened and solely determined by strength of belt. Furthermore, field observation proves the low active supporting effects to roof, thus leading obvious roof sink even without the disturbance of mining activity. Eventually, some solutions are proposed with the intention to improve the situation based on the economic and technical considerations, including bolting in humidity environment, rational cable bolt length, wise choice of face plate, and ways to increase pretension force. The viewpoints and comments of this study can be referred by practitioners in coal mines sharing same difficulties.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 257--267
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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