Carbon emission calculation of construction machinery during the expressway construction period

Prefabricated building, as a representative of modern architecture, has been vigorously promoted, and the traditional problems of large on-site labor and long construction period have been well solved. At present, the development focus of prefabricated building has shifted to the stage of low-carbon, environmental protection, green and energy-saving sustainable development. Whether green and low-carbon design is considered in the planning and design stage has the greatest impact on the whole life cycle of the building. Therefore, this paper mainly summarizes the concept and importance of green and low-carbon building design; The paper points out the embodiment of green and low-carbon concept in prefabricated building design; And how to calculate the carbon emission in the design stage; In view of the prefabricated building design stage to achieve a better green low-carbon state of optimization countermeasures.

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The Theory and Practice of Land Saving of Expressway Construction in China: A Case Study on Expressway of Kaifeng-Luoyang City

Traffic and Transportation Studies (2000) ◽

10.1061/40503(277)41 ◽

2000 ◽

Author(s):

Xuifang Fan ◽

Kening Wu ◽

Sulan Ma

Keyword(s):

Theory And Practice ◽

Expressway Construction ◽

Land Saving

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Impact Assessment of Dynamic Characteristics on the Hydraulic Driven Machinery Operation

Mechanical Engineering and Computer Science ◽

10.24108/0418.0001354 ◽

2018 ◽

pp. 1-12

Author(s):

A. D. Terenteva

Keyword(s):

Dynamic Error ◽

Total Error ◽

Soil Layer ◽

Hydraulic Drive ◽

Hydraulic Cylinder ◽

Working Mechanism ◽

Automated Control ◽

Vertical Coordinate ◽

Construction Machinery ◽

The Difference

In civil engineering in Russia, trenching for utilities is currently under digging. To perform such works, it is necessary to use high-precision construction machinery, because inaccurate performance of works can lead to the break down of existing utilities, thereby affecting the residents of nearby houses and demanding the additional works for renewal.The most universal labour saver to perform construction works is hydraulic driven single-bucket excavators, which provide up to 38% of works. Therefore, to improve technical characteristics that affect the accuracy of the work performed is an important task.High requirements for the performance of works are defined by existing construction regulations: an allowable soil layer to remain is at most 0.05 m. To fulfil such requirements, an exact assessment of the working mechanism position and a trench profile is necessary.Examination of a manually operated digging process shows that an operator provides operations untimely, however an automated control system can solve this problem. Dynamic phenomena in the working mechanism have the greatest impact on the accuracy of the works performed.To assess the bucket digging edge position accuracy, a mathematical model of the working mechanism has been created. Based on the cycle scheme of the working process, the excessive displacements of the hydraulic cylinder rods under the load are taken into account. By the end of the cycle, the difference between the specified and obtained positions along the vertical coordinate has been 0.0892 m.A dynamic error of the hydraulic drive system of the working mechanism is considered as a sum of the error due to excessive displacements of the hydraulic cylinder rods and the error due to delay of the hydraulic drive, with the latter being calculated for the average time of delay taking into account the data available in the literature. The total error of the bucket digging edge position of the working mechanism is 0.1176 m, which is 2 times more than the value of 0.05 mConformity of all the links with specification requirements does not guarantee compliance with the required displacement accuracy of the bucket digging edge, and, thus, the soil layer to remain in the base of the trench can exceed the regulated value of 0.05 m.

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CREATING WALKING LED TRANSIT STATIONS FOR WOMEN IN MALAYSIA

Malaysian Journal of Sustainable Environment ◽

10.24191/myse.v7i1.8912 ◽

2020 ◽

Vol 7 (1) ◽

pp. 99

Author(s):

Yong Adilah Shamsul Harumain ◽

Nur Farhana Azmi ◽

Suhaini Yusoff

Keyword(s):

Quality Of Life ◽

Developing Countries ◽

Public Transportation ◽

Carbon Emission ◽

The Other ◽

Walking Distance ◽

The Road ◽

On The Road ◽

Female User

Transit stations are generally well known as nodes of spaces where percentage of people walking are relatively high. The issue is do more planning is actually given to create walkability. Creating walking led transit stations involves planning of walking distance, providing facilities like pathways, toilets, seating and lighting. On the other hand, creating walking led transit station for women uncover a new epitome. Walking becomes one of the most important forms of mobility for women in developing countries nowadays. Encouraging women to use public transportation is not just about another effort to promote the use of public transportation but also another great endeavour to reduce numbers of traffic on the road. This also means, creating an effort to control accidents rate, reducing carbon emission, improving health and eventually, developing the quality of life. Hence, in this paper, we sought first to find out the factors that motivate women to walk at transit stations in Malaysia. A questionnaire survey with 562 female user of Light Railway Transit (LRT) was conducted at LRT stations along Kelana Jaya Line. Both built and non-built environment characteristics, particularly distance, safety and facilities were found as factors that are consistently associated with women walkability. With these findings, the paper highlights the criteria which are needed to create and make betterment of transit stations not just for women but also for walkability in general.

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