China Railway Fifth Survey and Design Institute Group Co.
China Railway Fifth Survey and Design Institute Group Co.
Zheng J.,China Power Engineering Consulting Group Corporation |
Sang M.,China Railway Fifth Survey and Design Institute Group Co.
Journal of Geomatics | Year: 2017
Nowadays, German Single-line Surveying Method is commanly used in GRN Plane Network measurement. But it has several problems which still needs improvement, such as low work efficiency, great labor and its accuracy is easy to be affected by manual measurement. Aimed at the shortage of the German Single-line Surveying Method, this paper proposes a new method-Double-line Whole Network Surveying Method, and compares the results of the two methods mentioned above. Results show that the new method can not only meet the accuracy requirements, but also improve the on- site work efficiency and suits better for China's High-speed Rail construction. In addition, the new method has the characteristics such as net-shaped rules, the symmetry, can also be used for the remeasurement of CP III , which can improve on-site work efficiency greatly.
Li H.,Beijing Jiaotong University |
Ren G.,Beijing Jiaotong University |
Lian Y.,Beijing Jiaotong University |
Zhu B.,Beijing Jiaotong University |
And 3 more authors.
Optics Letters | Year: 2016
We present the viability of exploiting a current hollow-core photonic bandgap fiber (HC-PBGF) to support orbital angular momentum (OAM) states. The photonic bandgap intrinsically provides a large refractive index spacing for guiding light, leading to OAM transmission with low crosstalk. From numerical simulations, a broad OAM±1 mode transmission window with satisfied effective index separations between vector modes(>10-4) and low confinement loss (<3 dB?km) covering 240 nm bandwidth is observed. The OAM purity (defined as normalized power weight for OAM mode) is found to be affected by the modal effective area. Simulation results also show HC-PBGF based OAM transmission is immune to fabrication inaccuracies near the hollow core. This work illustrates that HC-PBGF is a competitive candidate for high-capacity communication harnessing OAM multiplexing. © 2016 Optical Society of America.
You D.-M.,Transport Management Institute |
Li L.,China Railway Fifth Survey and Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2015
Research purposes: There is only Lanzhou-Lianyungang Railway in Lianyungang area now. Qingdao-Lianyungang Railway and Lianyungang-Yancheng Railway which have started at the end of 2013 will build coastal railway channel. Lianyungang-Zhenjiang Railway is proposed to build at 2015 year, Xuzhou-Lianyungang passenger dedicated line in planning is provided on the construction schedule, and then Lianyungang will become cohesion of five direction key area of Xuzhou, Yancheng, Huai'an, Rizhao and Lianyungang East. Through the analysis of the current situation of Lianyungang area railway, overall consideration of construction project and planning project in the area, this paper conducted the system research to connection scheme and the interval scheme, from economic and technological rationality and construction time of selection, proposed the best scheme of leading Lianyungang-Zhenjiang Railway into Lianyungang region in order to improve the general layout. Research conclusions: Research conclusions are as follows: (1) Lianyungang-Zhenjiang Railway can adopt two schemes of directly leading into Lianyungang station and leading integration to the Lianyungang-Yancheng Railway Dongji station into Lianyungang station. (2) After comprehensive comparison, the scheme of leading integration to Lianyungang-Yancheng Railway Dongji station into Lianyungang station is recommended, and the solution can be taken to start additional reverse line to compensate for the lack of the long-term Lianyungang ~ Lianyungang East transport capacity, which makes the program more economic and reasonable. (3)This research result can be applied to general plan regional planning research. ©, 2015, Editorial Department of Journal of Railway Engineering Society. All right reserved.
Dou J.,Construction Headquarters of the Fugu Coal Dedicated Railway Line |
Chen D.,China Railway Fifth Survey and Design Institute Group Co.
Modern Tunnelling Technology | Year: 2014
In light of the clearance intrusion of the primary support in the Sujiawan tunnel, this paper determines relevant parameters for controlling support deformation based on checking the support structure and secondary lining with MIDAS-GTS software and analyzing the geological conditions of the tunnel body. Reasonable countermeasures are proposed after the analysis of required construction technologies, including strengthening geological surveys of the top of the tunnel's central line, improving the drainage system, enhancing the support system with an increased reserved deformation allowance, and intensifying tunnel monitoring and measurements. ©, 2014, Editorial Office of "Modern Tunnelling Technology". All right reserved.
Zhang Z.,China Railway Fifth Survey and Design Institute Group Co.
Modern Tunnelling Technology | Year: 2014
During metro construction, the problems arising from the excavation of mined tunnels passing existing structures have drawn more and more attention. Based on the construction of the Daguanying station of the Beijing metro line 7 and the principles of stratum-structure interaction, this paper simulates the construction of a mined tunnel passing 4 small existing pilot headings and analyzes the influences of the construction on the deformation, stress of the pilot headings, surface settlement, and nearby pipelines. It is concluded that the construction creates an obvious disturbance of the existing structures and after the reinforcement of the passing sections, the deformation of the pilot headings, stress concentration on both sides, and surface settlement are well controlled.
Wang R.,Jiangsu Jianzhu School Institute |
Zhang W.,China Railway Fifth Survey and Design Institute Group Co.
Applied Mechanics and Materials | Year: 2014
As residential industrialization is still in the primary stage in China, it has become the important and difficult points that must be worked out immediately to realize the modernization of housing industry to analyze and resolve restricting elements in the development of residential industrialization. The premise and safeguard is policy specification, the basis and important support is technology system, the significant method is production models while the key point is that people understand and accept industrialized residence. © (2014) Trans Tech Publications, Switzerland.
Lu Y.-J.,China Railway Fifth Survey and Design Institute Group Co.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2014
Soil filling above an existing shallow-buried tunnel probably leads to deformation of tunnel lining and reduction of the safety factor and even leads to destroying of tunnel lining and detriment to traffic safety. The filling project of a planned park to be executed above the Changqiangling Tunnel of the Yangpingguan-Ankang Railway was taken as an example. Selecting some typical sections, the influence of different filling thicknesses on the existing shallow-buried tunnel was analyzed numerically and the allowable filling thickness was determined.The research results indicate as follows: Filling above the existing shallow-buried tunnel causes monolithic lining settlement and basically symmetrical lining settlement on both left and right sides and produces gradually reduced displacements from vault to invert of the tunnel; the post-filling safety factors of the monolithic lining are decreased but by a not-large magnitude, however, the safety factors of the abutment and vauet become so low as to cause cracks possibly to occur; the displacement at the vault increases almost linearly with increasing of the filling thickness, so the allowable filling thickness should be sets as 0.3H~0.4H(H representing the covering depth of the existing tunnel) to control displacements; by analyzing a number of sections, the curve of allowable filling is obtained for the fill zone, then filling within the range of this curve and adoption of corresponding engineering measures can insure the operation safety of the existing tunnel. The proposed method is simple, easy to execute and accurate in meeting engineering requirements, so it can be used to guide engineering practice and provide reference to similar engineering projects.
Liu J.,China Railway Fifth Survey and Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2013
Research purposes: Combined with construction of a (48+4×80+48)m rigid frame-continuous girder bridge in a high seismic intensity area, the effects of applying the fluid viscous damper, lock-up device, double spherical seismic isolation bearing and shock absorber to the long multi-span rigid frame-continuous girder bridge are analyzed and compared respectively, and the main parameters that affect to the effect of seismic isolation design are discussed to provide the basis for the reasonable selection of seismic isolation measures. Research conclusions: (1) It is necessary to make the seismic design for the long multi-span rigid frame-continuous girder bridge in a high seismic intensity area because the seismic response to the rigid frame pier is rather big. (2) The analysis results show that the four seismic isolation measures of using the fluid viscous damper, lock-up device, double spherical seismic isolation bearing and shock absorber have their own advantages and disadvantages. The first two measures are only available for the bridge in longitudinal direction. The latter two measures are available for the bridge in both longitudinal direction and in transverse direction. (3) Reasonably selecting seismic isolation measure and its main parameters is very important to the seismic design of long multi-span rigid frame-continuous girder bridges in a high seismic intensity area. (4) The research results can be used in guiding for seismic design of bridge.
Wan Y.,China Railway Fifth Survey and Design Institute Group Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013
For the "four-Electricity" integration of High-Speed Railway, this paper briefly describes the status and problem of the current SCADA system, presents a solution of SCADA system based on cloud computing, and introduces the basic concept of Hadoop platform, discusses in detail Hadoop-based design and technology roadmap for the large-scale, wide-area, distributed SCADA system, and provides a useful exploration on design method.
Guo Q.,China Railway fifth survey and Design Institute Group Co.
Advanced Materials Research | Year: 2011
The assessment of the interaction between a new tunnel and existing residential or office building is an important issue in urban area. In this study, special protection design for existing structures is introduced based on an actual engineering project of urban tunnel closely passing beneath an existing residential building. Cavern-pile construction method and deep grouting technique with ultra-advanced steel pipe are used in this project to efficiently control the settlement of the stratums on top of tunnel. Additionally, the effect of tunneling on the existing residential building is investigated through finite element calculations. The load condition, deformation and stability of the tunnel elements beneath building are also analyzed. Then, on the basis of calculated results, it is concluded that the new tunnel constructed by cavern-pile method causes small ground settlement, therefore it does not considerably affects the existing building. The safety of resident is guaranteed. © (2011) Trans Tech Publications.