— abrasion has made it challenging for the railway industry to use prestressed concrete as a railway sleeper especially on high speed tracks [8] Over the last three decades researchers in different parts of the world have been investigating the failures of con crete sleepers and looking for sustainable solutions Among
Yêu cầu trực tuyến →— The current paper deals with the numerical investigation of a unique designed pre stressed reinforced concrete railway sleeper for the design speed of 300 km/h as well as an axle load of 180 kN The authors applied different methodologies in their research traditional hand made calculations and two types of finite element software The
Yêu cầu trực tuyến →— In the present study two kinds of railway sleepers namely Indian sleeper RT2496/60 kg and Chinese type III prestressed concrete sleeper [CT III PCS] are considered to assess the performance under harsh loading conditions which arise due to modern high speed or semi high speed rails on ballasted tracks
Yêu cầu trực tuyến →About High Speed Rail; High Speed Rail; Hong Kong West Kowloon Station; High Speed Rail User Guide; Latest News; Overview; Smart tips for holiday travel on High Speed Rail; New sleeper train to Beijing and Shanghai; New Zhangjiajiexi route calling at Fenghuanggucheng station; Same day Flexi trip Arrangement; 20 ride Ticket 30 day Ticket
Yêu cầu trực tuyến →— However the high speed characteristic of high speed railroads with trains frequently traveling at speeds of 200 350 km/h demands extremely strict deformation criteria Therefore there is a need for more stringent disturbance control standards during shield tunnel construction [18] It is observed that single reinforcement measure may be
Yêu cầu trực tuyến →— The new type of Chinese high speed train named CR400 is used in the numerical model based on the ABAQUS software Fig 1 illustrates the configuration of the CR400 train composed of a set of cars where the length of one car is 25 m and the spacing between two wheelsets in one bogie is m The typical car consists of one car body
— Table 1 shows the requirement on the performance of cement used in the manufacture of concrete sleepers according to American European and Chinese standard which are AREMA CHAPTER 30 EN 13230 1 and GBT 37330 AREMA 2014; EN 13230 1 2016 1323; GBT 37330 2019 is observed that GBT 37330 and AREMA
Yêu cầu trực tuyến →— The high performance concrete HPC mixtures utilized Portland cement drinkable water crushed granite as coarse aggregate river sand as fine aggregate silica fume Superplasticizer and waste
Yêu cầu trực tuyến →The drum is then turned for 70 to 100 revolutions or about five minutes at mixing speed Concrete mixed in the yard The drum is turned at high speed or 12 15 rpm for 50 revolutions This allows a quick check of the batch The concrete is then agitated slowly while driving to the job site Concrete mixed in transit
Yêu cầu trực tuyến →— Fig 2 shows a sleeper vertically acted by train wheels and the bearing stress distribution under the sleeper The static axle load of a high speed train would be in the range of 170 190 kN depending on the tractive capabilities of the axle [2] The dynamic axle loads would be dependent on the train speed axle suspension system wheel
— 1 Introduction In recent years there was a fast development of the high speed railway in China However this infrastructure system is facing with challenges from severe weather conditions such as freeze thaw cycles downpour and scorching heat [1] [2] These challenges may result in a rapid change of moisture content in the subgrade
Yêu cầu trực tuyến →— High speed rail HSR has recently expanded its networks globally but its 350 km/h bridges have not yet been tested for high level earthquakes This study tests the typical HSR bridge on a
Yêu cầu trực tuyến →17 — Designed Mix Ratio of Concrete; High Strength Concrete Mix ; 1 Nominal Mix Ratio In nominal mixed concrete the proportion of mixing concrete ingredients is fixed and recommended by standard codes For M 15 grade of concrete mix the ratio is 1 2 4 which means 1 part cement 2 part sand and 4 part aggregate used to prepare concrete mix
— The high speed railway construction in China is undergoing a revolution These high speed railway trains 350 km/h have made the country s vast territory substantially smaller and changed the lifestyle socially and shown in Fig 1 a novel type ballastless slab form which consists of concrete track slab cement asphalt
Yêu cầu trực tuyến →In some countries concrete sleepers occupy an important position For example on the highest line categories in the UK pre stressed concrete ties are the only ones permitted by Network Rail standards Concrete sleeper advantages Cheaper; Easier to obtain; Less maintenance required; Longer service life; Disadvantages Hard to handle due to
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