scholarly journals Identification of Precast Parapet Work Activities in Elevated Railway Construction

2021 ◽  
Vol 2 (02) ◽  
pp. 52-61
Author(s):  
Pungky Dharma Saputra
Keyword(s):  
High Speed ◽  
Descriptive Analysis ◽  
Light Rail ◽  
Infrastructure Development ◽  
High Speed Rail ◽  
Work Activities ◽  
Railway Construction ◽  
Railway Infrastructure ◽  
Concrete Casting ◽  
Double Track

Railway infrastructure development is very massive in Indonesia. Many projects have been constructing since 2013, such as the Mass Rapid Transit (MRT), Light Rail Transit (LRT), Double-Double Track (DDT), and High-Speed Rail (HSR). And all of these projects were design with elevated structures. When applying precast parapet panel technology in the MRT project elevated section, the contractor didn’t have a reference for precast parapet work activities. Hence, it required new planning for its construction and took time. The project sample of this research was MRT Jakarta CP 103 Project. There were three stages in this research starting from documentation analysis, expert judgment, and respondent survey. There were 5 bridge construction experts and 30 respondents which were professional engineers asked for their recommendations and opinions. Descriptive analysis was applied to know the percentage of opinions. This research focuses on identifying precast parapet activities in elevated railway construction project. There are 14 activities that had been identified in this research, namely preparation, position survey, adjustment material installation, precast parapet panel shifting from trailer to the top of deck slab, precast parapet panel distribution, precast parapet panel installation, rebar parapet installation for concrete stitch, sealing work, concrete casting, formwork dismantling, and finishing. These activities will be very useful for similar precast parapet works in a future project.

scholarly journals Visions of a polycentric suburb : the evolution of car-centric design

2021 ◽  
Author(s):  
Mark Siemicki
Keyword(s):  
Urban Sprawl ◽  
High Speed ◽  
Light Rail ◽  
High Speed Rail ◽  
Southern Ontario ◽  
Commuter Rail ◽  
Suburban Cities ◽  
Emerging Issues ◽  
Rail Rapid Transit ◽  
Globalized World

The following thesis investigates emerging issues surrounding car-centric design know as urban sprawl and questions whether or not it is feasible and appropriate for cities to continue sprawling in a car-centric manner given changing conditions. Social, political, environmental and economical concerns have surfaced putting a damper on the once great "American Dream" raising concerns that car-centric design can prove detrimental to humanity. The roots of modernist design are discussed and the ideas behind modernists' intentions analyzed while juxtaposing modernist vision to the real outcomes of modernism. Modernist ideas are compared and contrasted to new and old theories that challenge the modernist ideals in order to propose a new direction for future urban development. The design project takes into account the importance of connection and network through infrastructure in a globalized world. Transit infrastructure (high speed rail, improved commuter rail, rapid transit and light rail) is proposed on a number of scales in the Southern Ontario region to act as a catalyst for responsible growth interconnecting future intensified polycentric suburban cities.

scholarly journals Technical parameters of high speed lines as the determinant for selection of rolling stock

2018 ◽  
Vol 180 ◽  
pp. 06007
Author(s):  
Jan Raczyński
Keyword(s):  
High Speed ◽  
Point Of View ◽  
Rolling Stock ◽  
High Speed Rail ◽  
Technical Parameters ◽  
Rail Vehicle ◽  
Railway Infrastructure ◽  
The One ◽  
Selection Of

Choosing a high-speed rail vehicle depends on many factors. On the one hand, there are requirements for ensuring the quality of service for passengers, on the other hand, there are constraints resulting from the parameters of available infrastructure. Also a relation of the benefit and financial costs associated with the purchase and the operation of rolling stock is essential. Technical characteristics of vehicles selected for operating a particular system is a compromise between the three groups of requirements. In this article technical parameters of railway infrastructure and rolling stock are classified and then analysed from the TSI requirements point of view.

Debt reliance will undermine Laos's development

2015 ◽  
Keyword(s):  
High Speed ◽  
National Development ◽  
Asian Development Bank ◽  
Infrastructure Development ◽  
Development Bank ◽  
High Speed Rail ◽  
Significant Development ◽  
Content Type ◽  
Manufacturing Sectors ◽  
Preparatory Work

Significance Alongside loans, the sale will support energy infrastructure development, part of Vientiane's national development and economic growth plans; Laos has also started preparatory work for a high-speed rail link with China and Thailand. However, there are fears that the rail scheme might bankrupt the country (the Asian Development Bank (ADB) in 2012 described it as "unaffordable") while the IMF warned in January that Laos could face wider financial stress, including debt defaults, after years of rapid credit growth and mounting public liabilities. Impacts Ceding the rail project's management to China increases the risk of Laos losing control over its financial affairs. The railway is unlikely to spur significant development of Laos's mining, agriculture and manufacturing sectors. Pledging future mining revenues as payment for loans will erode Laos's government income and public services.

Land Use and Transit Integration and Transit Use Incentives

1998 ◽  
Vol 1618 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Snehamay Khasnabis
Keyword(s):  
Land Use ◽  
High Speed ◽  
Private Investment ◽  
Light Rail ◽  
Urban Structure ◽  
Sources Of Information ◽  
Cooperative Research ◽  
High Speed Rail ◽  
Transportation Policies ◽  
Urban Activities

Planners have often looked on transportation policies as a means of controlling broad patterns of land use. It has been argued that past transportation policies have contributed to decentralization of urban activities resulting in congestion, traffic hazards, and environmental pollution. Others contend that urban land uses reflect location decisions by individual households and employers and that transportation is just one of the many factors that affect such decisions. Thus, public policies in transportation have very little opportunity to alter future land use. The exact effect of transit on the distribution of urban activities, the resulting urban structure, the level of congestion, and air quality is not fully understood. An attempt is made in this paper to document successful cases of transit and land use integration as well as the techniques used by different agencies to bring about such integration. Various studies under the Transit Cooperative Research Program on different aspects of transit and land use policies serve as the basic sources of information for this paper. Eight case studies are examined that encompass a variety of transit modes in urban North America. It is concluded that the accessibility advantages provided by transit may play a crucial role in the concentration of development and in creating economic opportunities. However, transit by itself is not sufficient to guarantee successful transit-focused development. Other major factors are supportive regional and local policies and private investment in concert with the transit program. Further, successful transit and land use integration does not necessarily imply the presence of a high-speed rail system. In a strong market, when support policies are in place, light rail and busways can also be used to channel urban growth.

scholarly journals Alternate Double Single Track Lines

2016 ◽  
Author(s):  
Zacarias Grande Andrade ◽  
Paola Moraga Contreras ◽  
Enrique Castillo Ron
Keyword(s):  
Travel Time ◽  
High Speed ◽  
Time Increase ◽  
Single Track ◽  
Maintenance Costs ◽  
Railway Infrastructure ◽  
Double Track

The paper discusses the advantages and shortcomings of alternate double single track (ADST) lines with respect to double track lines for high speed lines. ADST lines consists of sequences of double and single track segments optimally selected in order to reduce the construction and maintenance costs of railway lines and to optimize the timetables used to satisfy a given demand. The single tracks are selected to coincide with expensive segments (tunnels and viaducts) and the double tracks are chosen to coincide with flat areas and only where they are necessary. At the same time, departure times are adjusted for trains to cross at the cheap double track segments. This alternative can be used for new lines and also for existing conventional lines where some new tracks are to be constructed to reduce travel time (increase speed). The ADST proposal is illustrated with some examples of both types (new lines and where conventional lines exist), including the Palencia-Santander, the Santiago-Valparaíso-Viña del Mar and the Dublin-Belfast lines, where very important reductions (90 %) are obtained, especially where a railway infrastructure already exist.DOI: http://dx.doi.org/10.4995/CIT2016.2016.3426

scholarly journals The Impact of High-Speed Rail Opening on City Economics along the Silk Road Economic Belt

2020 ◽  
Vol 12 (8) ◽  
pp. 3176 ◽  
Author(s):  
Feng Li ◽  
Yang Su ◽  
Jiaping Xie ◽  
Weijun Zhu ◽  
Yahua Wang
Keyword(s):  
Economic Growth ◽  
High Speed ◽  
Silk Road ◽  
Growth Effect ◽  
Control Group ◽  
High Speed Rail ◽  
Large Cities ◽  
Railway Infrastructure ◽  
Silk Road Economic Belt ◽  
The Impact

Achieving transport connectivity is a priority in China’s “Belt and Road Initiative”. In order to further understand the impact of railway infrastructure on city-level economic expansion, we set cities with high-speed rail as the treatment group and those without high-speed rail as the control group, and a difference-in-differences (DID) technique was used to estimate the growth impact and heterogeneity of high-speed rail opening on the economic growth of cities along the New Silk Road Economic Belt. The main results are as follows: First, economic growth in cities with operational high-speed rail lines was significantly higher than those without high-speed rail. Second, the impact of high-speed rail on economic growth exhibited distinct heterogeneity. Large cities tend to have a stronger siphoning effect, resulting in more pronounced impact of high-speed rail opening on urban economic growth. Third, cities with higher marketization levels and higher government efficiency were shown to have stronger economic growth effect.

scholarly journals China's Eagerness to Export Its High-speed Rail Expertise to ASEAN Members

2015 ◽  
Vol 32 (2) ◽  
pp. 13-36 ◽  
Author(s):  
Yu Hong
Keyword(s):  
High Speed ◽  
Chinese Government ◽  
Infrastructure Development ◽  
High Speed Rail ◽  
Global Competitiveness ◽  
National Pride ◽  
Asean Member ◽  
Foreign Policies ◽  
Rise Of China ◽  
The Rise Of China

The Chinese government is adopting a 'going-out' strategy to promote China's high-end rail technology overseas and strengthen its global competitiveness. This article examines China's high-speed rail diplomacy towards the Association of Southeast Asian Nations (ASEAN) and uncovers the link between China's ambitious foreign policies towards the ASEAN and both national pride and commercial stakes in promoting high-speed rail in the region. It analyses the rationale behind China's high-speed rail development proposals for the ASEAN in the context of the rise of China and rivalry between China and Japan. China is especially eager to participate in the construction of high-speed railroads with ASEAN members. The high-speed rail link can forge regional economic integration within the ASEAN. For ASEAN member states, China is a key external investor and contractor for their infrastructure development. Nevertheless, China is facing serious challenges to the realization of its proposals.

A closer look at rail methodology in the BTS National Transportation Noise Map

2021 ◽  
Vol 263 (1) ◽  
pp. 5372-5381
Author(s):  
Amanda Rapoza ◽  
Meghan Shumway ◽  
Gary Baker ◽  
Peter Wilke
Keyword(s):  
High Speed ◽  
Light Rail ◽  
Urban Centers ◽  
High Speed Rail ◽  
Transportation Noise ◽  
Passenger Rail ◽  
Commuter Rail ◽  
Noise Data ◽  
Time Changes ◽  
Noise Map

In 2017, the Bureau of Transportation Statistics released the inaugural national, multi-modal transportation noise map prototype. The noise modeling and mapping effort was envisioned as a way to facilitate the geographic tracking of national trends and provide insight into transportation noise-related questions as changes occur over time - changes between modes, types of vehicles within modes and the geographic shifts of populations. How do changes in aircraft technology change the transportation noise landscape? Does increased high speed rail availability affect highway-related noise? How does a population shift away from urban centers affect the soundscape? The inaugural model included aviation and highway sources. The first update, released in November 2020, includes passenger rail-related noise in addition to aviation and highway sources. Operations in this new mode include commuter rail mainline, high-speed electric, light rail, heavy rail and streetcars, along with commuter rail horns at highway-rail grade crossings. The data for this noise map were modeled based on USDOT methods, with adjustments and simplifications to model on a national scale. This paper focuses on the modeling methods and geospatial approach used to develop the passenger rail noise data layer.

scholarly journals Maglev freight - one possible path forward in the U.S.A.

2018 ◽  
Vol 4 (3) ◽  
pp. 117-133
Author(s):  
Arthur Lester Wolek
Keyword(s):  
United States ◽  
High Speed ◽  
Energy Use ◽  
Magnetic Levitation ◽  
The United States ◽  
Dual Use ◽  
High Speed Rail ◽  
Freight Train ◽  
Railway Infrastructure ◽  
Magnetically Levitated

Background: As high-speed rail and other transportation technologies are moving forward and gaining funding in the United States, the push for MagLev is not receiving the necessary support that would make it a viable alternative in the near future. Major changes in the approach to implementing MagLev could make a better case for it, specifically for carrying freight. One alternative that has been considered in the past is the modification of existing freight railways to support MagLev. For this to be economically feasible and practical, such a solution has to be able to support both conventional freight trains and MagLev freight.    Aim: The successful application of Partially Magnetically-Levitated Freight (PMLF) technology achieved by integrating superconducting MagLev technology with current railroad design and operations. Methods: A MagLev freight system that is envisioned to use existing rail routes must be designed to be compatible with the existing railway infrastructure. To accomplish this, every component utilized by the railroads must be examined in detail to determine if and how it could be affected by the proposed PMLF. In addition, components that will need to be modified for PMLF operation must undergo a retrofit design and testing process. The design scope must also include an examination of all existing tasks and activities that are being performed by the railroads such as track maintenance and repair. Any procedures that affect or are affected by the addition of PMLF will need to be modified. Finally, superconducting MagLev technology must be optimized and advanced for application to PMLF.    Opinions and Discussions: The dual use of railway lines has substantial cost advantages when compared to building new dedicated MagLev freight corridors. In fact it could make the entire proposition very appealing if proven to be technically feasible. However, there are certain limitations and concerns that would cause policy makers to reject such a proposal unless such obstacles can be shown to be temporary and non-critical. Essential rail installations such as switches are presently difficult to modify in a way that would ensure reliable functionality for both MagLev and conventional freight trains, and grade crossings pose safety risks. It is difficult to envision the tremendous leap forward of merging MagLev with existing freight rail lines when much more basic technologies such as positive train control are not even fully implemented. Consequently, it is a challenge to advance MagLev in the United States where new dedicated freight corridors are considered to be cost-prohibitive and dual use railway lines pose uncertainties that railroad companies simply do not want to solve. However, there is one more solution has not been considered that would allow a MagLev freight train to navigate on existing railway infrastructure without disrupting traditional rail utilization. This solution is a partially magnetically-levitated freight train. Results: After reviewing the fundamental components, systems and operations of the railways in the United States, it will be feasible and practical to introduce magnetic levitation technology to assist in moving freight on existing rail routes. PMLF trains will be able to take advantage of magnetic levitation on sections where the track has been upgraded to allow its use and much higher speed while still being able to travel on unmodified sections with the same speed as traditional trains. Conclusion: Modifying existing freight rail with magnetic “quasi-lift” technology is a much lower cost alternative to building an entirely new MagLev infrastructure. This alternative will provide very important benefits including enhancing safety in the rail industry. In its first phase of implementation, the proposed PMLF system will levitate a significant portion of the weight of the train but still utilize the existing steel rails for traction and guidance. The most evident advantages of this approach include reduced wear on rail and other supporting elements, and a significant reduction in friction and energy use. Locomotives, freight cars and all other components could be made lighter and travel speeds will increase dramatically due to less impact and other effects. Later phases of implementation will focus on magnetic traction and guidance. The acceptance and success of this partially levitated system will eventually lead to fully levitated freight transport technology. Sometimes it is necessary to take smaller steps to achieve the desired future.

Sign in / Sign up

Export Citation Format

Share Document