Research on Construction Technology of Inclined Pylon of Single Pylon Cable-Stayed Bridge without Backstays

2011 ◽  
Vol 90-93 ◽  
pp. 1168-1172
Author(s):  
Ying Lei Zhu
Keyword(s):  
Computational Model ◽  
Henan Province ◽  
Construction Technology ◽  
Box Girder ◽  
Construction Period ◽  
Cable Stayed Bridge ◽  
New Type ◽  
Complex Construction ◽  
Longitudinal Cracks ◽  
Selection Of

A new type of cable-stayed bridge, single pylon cable-stayed bridge without backstays is used in the Zhenshui Road Bridge in Xinmi City, China’s Henan Province, which adopts PC box girder with corrugated steel webs. It has many advantages such as light girder deadweight, low pylon height and avoiding webs longitudinal cracks. This novel bridge is adopted firstly in China. Cast-in-place method with bracket is used in the construction of the bridge’s inclined pylon because of its complex construction technology and tight construction period. In this paper, interests are focus on the scheme comparison and selection of bracket construction, the establishment of bracket’s computational model and the result of numeric analysis etc. The chief aim of this investigation was provides useful reference and enlightenment to similar bridge types.

The Key Technology of Skew Continuous Prestressed Concrete Box Girder Bridges with Incremental Launching Method

2008 ◽  
Vol 400-402 ◽  
pp. 639-644
Author(s):  
Zhong Chu Tian ◽  
Guo Liang Zeng ◽  
Min Chen ◽  
Hai Ling Yue
Keyword(s):  
Prestressed Concrete ◽  
Construction Technology ◽  
Box Girder Bridges ◽  
Mountain Area ◽  
Box Girder ◽  
Construction Period ◽  
Girder Bridges ◽  
Skew Bridges ◽  
Concrete Box Girder Bridges ◽  
The Cost

Incremental launching method is a construction technology for prestressed concrete continuous bridges widely used in China. In the incremental launching method, the superstructure of a bridge is erected from one side of bridge longitudinally to the opposite bank. Compared with other technology for bridge erection methods, it may reduce the cost of labor, shorten the construction period and save the assembly yard. So it is a competitive construction method for medium-span prestressed concrete continuous bridges. A large number of skew bridges will be built especially at mountain area, so it is very necessary to research on incrementally launching method for skew bridges. The objective of the study presented in this paper is to introduce the method used in the Lishui Bridge in Zhangjiajie city of China.

Construction Technology of Jiu-Jiang Yangtze River Highway Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1274-1278 ◽  
Author(s):  
Yong Tao Zhang ◽  
Xin Li ◽  
Xin Peng You
Keyword(s):  
Yangtze River ◽  
Control Measures ◽  
Highway Bridge ◽  
Construction Technology ◽  
Box Girder ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
North Side ◽  
Steel Box Girder ◽  
Main Girder

Jiu-Jiang Yangtze River Highway Bridge, with a main span of 818m, is another long span hybrid girder cable-stayed bridge which connects Jiang Xi province and Hu Bei province in China. Steel box girder is adopted in main span and north side span, and main girder of south side span and south tower nearby is designed of concrete box girder. The pylon is concrete structure, with the height of 242.3m and H-shape. There are 216 cables used in this bridge, of which are assembled by parallel strands. Jiu-Jiang Yangtze River Highway Bridge began to construct in 2009, and was closed in December, 2012. The bridge opened to traffic officially in the next year. Design concept, construction method and vibration control measures about Jiu-Jiang Yangtze River Highway Bridge are introduced in this article.

Research on Lifting Techniques of Large Segments of Steel Box Girder of Chongqi Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 1094-1098 ◽  
Author(s):  
Hong Zhang ◽  
Ren Zhong Zhou
Keyword(s):  
Security Risk ◽  
Box Girders ◽  
Box Girder ◽  
Steel Box Girder ◽  
Site Characteristics ◽  
New Type ◽  
Floating Crane ◽  
And Performance ◽  
Lifting Techniques ◽  
Selection Of

Techniques of lifting large segments of steel box girder by floating crane is used in construction of Chongqi Bridge. Considering the hydrological environment on the site, characteristics of steel box girders and performance parameters of floating crane, the selection of floating crane is carried out. To ensure hoisting work achieve function and safety, a new type of lifting device named Self-balance lifting device is designed, and the lifting-points design is optimized to make the reaction of all lifting-points of large segments equal. In the erection process of large segments, the security risk control is analyzed to ensure the steel box girders and lifting equipments safety.

Selection of worm species and packing in a new type of biologic reactor for sludge reduction

2014 ◽  
Author(s):  
S.X. Li ◽  
Z.H. Wang ◽  
D.M. Li ◽  
W.W. Duan ◽  
S. Mei ◽  
...  
Keyword(s):  
Sludge Reduction ◽  
New Type ◽  
Selection Of

scholarly journals Construction Technology and Mechanical Properties of a Cement-Soil Mixing Pile Reinforced by Basalt Fibre

2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Yingwei Hong ◽  
Xiaoping Wu ◽  
Peng Zhang
Keyword(s):  
Mechanical Properties ◽  
Core Sample ◽  
Strength Test ◽  
Construction Technology ◽  
Basalt Fibre ◽  
Soil Mixing ◽  
New Type ◽  
Tensile Splitting Strength ◽  
Cement Soil ◽  
Drilling Core

A new type of cement-soil mixing pile reinforced by basalt fibre is proposed for increasing the bearing capacity of cement-soil mixing piles. This work primarily consists of three parts. First, the process of construction technology is proposed, which could allow uniform mixing of the basalt fibre in cement-soil. Second, the optimal proportions of the compound mixtures and the mechanical properties of the pile material are obtained from unconfined compression strength test, tensile splitting strength test, and triaxial shear test under different conditions. Third, the reliability of the construction technology, optimal proportions, and mechanical properties are verified by testing the mechanical properties of the drilling core sample on site.

scholarly journals Development of KASP Markers for Germplasm Characterization and Fingerprinting Identification of Broccoli in China

2020 ◽  
Author(s):  
Yusen Shen ◽  
Jiansheng Wang ◽  
Huifang Yu ◽  
Xiaoguang Sheng ◽  
Zhenqing Zhao ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Marker Assisted Selection ◽  
Genetic Relationships ◽  
Cost Effective ◽  
Germplasm Characterization ◽  
2D Barcode ◽  
New Type ◽  
Generation Sequencing ◽  
Kasp Markers ◽  
Selection Of

Abstract Background: Broccoli (Brassica oleracea var. italica) is a vegetable widely cultivated in China. Many new-type broccoli cultivars were bred and developed by Chinese breeders during the recent three decades. However, the broccoli cultivar nomenclature and detailed information of genetic relationships among broccoli germplasms are unclear. Results: The present study identified millions of SNPs by next-generation sequencing of 23 representative broccoli lines. Through several steps of selection, 100 SNPs were successfully converted into KASP markers, and used to evaluate the genetic diversity, genetic relationship, and population structure of 392 broccoli accessions, which represent the mainly broccoli breeding materials in China. The initial, introduced and improved accessions were well clustered, though some accessions were overlapped between groups, probably reflecting the fact that breeding activities led to genetic similarities. To make the KASP genotyping more efficient and cost-effective, 25 of the 100 KASPs were selected for fingerprinting of all accessions, and the 2D barcode contained fingerprinting information were generated for elite varieties. Conclusion: The KASP markers developed in this study provided an efficient way for germplasm characterization, DNA fingerprinting, seed purity identification, and marker-assisted selection of broccoli in China.

scholarly journals Strategy and Technique of High Efficiency Balancing in Field for Turbo-Generator Units with Large Capacity

2021 ◽  
Vol 2101 (1) ◽  
pp. 012011
Author(s):  
Wenfang Cai ◽  
Songyuan Lu ◽  
Zhengfeng Wu ◽  
Guangyao Ying ◽  
Wenjian Wu
Keyword(s):  
High Efficiency ◽  
Large Capacity ◽  
Construction Period ◽  
Vibration Data ◽  
Influence Coefficients ◽  
Turbo Generator ◽  
Accurate Judgment ◽  
Key Techniques ◽  
Selection Of ◽  
Modal Method

Abstract Abstract.This paper aims at the high efficiency of field balancing for turbo-generator with large capacity currently, and introduces the strategies and key techniques of the rotor system balancing with practical cases of power plant in field. The acquisition, analysis and former processing of the original vibration data for balance calculation are included. Furthermore, they involve complete measuring points and conditions, accurate judgment for the types of unbalance exciting force and selection of stable vibration data, all these could reduce the blindness of balancing effectively. The strategies and techniques also contain the determination for axial plane of unbalance by the modal method, then the optimal steps and the plane of adding weight are chosen during the implementation of balancing. Besides, this paper also introduces the analysis and selection of influence coefficients and the phase of trial weight, these can help determine the final correction weight accurately in order to guarantee the balancing process prompt and efficient. Meanwhile, the restriction of practical location for adding weight and construction period of maintenance and production for the units should be considered during the high efficiency balancing in field. These strategies and techniques of high efficiency balancing have practical application value in promoting the technology of field balancing for turbo- generator units with large capacity.

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