Research and Application for Gap-Type Conductor Tension Stringing Machines

2014 ◽  
Vol 536-537 ◽  
pp. 1566-1569
Author(s):  
Zhen Chen ◽  
Kun Bai ◽  
Jun Wang
Keyword(s):  
Construction Technology ◽  
Construction Costs ◽  
Construction Period ◽  
Construction Task

Gap-type conductor stringing and currently existing conventional tension stringing construction technology are not identical, explore two old wires with a new gap-type conductor, which is two-pulling-one wire stringing construction technology. In this paper two-pulling-one running board is designed and manufactured to meet the stringing construction technology. The experiment results show that the system greatly improves the efficiency of the stringing, at the same time reduces construction costs, saves a lot of manpower and time, ensures the construction period, safely and efficiently completes the construction task.

Sewer System for Improving Flood Control in Tokyo: A Step towards a Return Period of 70 Years

1994 ◽  
Vol 29 (1-2) ◽  
pp. 303-310 ◽  
Author(s):  
Kazuyuki Higuchi ◽  
Masahiro Maeda ◽  
Yasuyuki Shintani
Keyword(s):  
Return Period ◽  
Flood Control ◽  
Rainfall Intensity ◽  
Runoff Coefficient ◽  
Large Drop ◽  
Construction Costs ◽  
Sewer System ◽  
Construction Period ◽  
Metropolitan Government ◽  
Under Construction

The Tokyo Metropolitan Government has planned future flood control for a rainfall intensity of 100 mm/hr, which corresponds to a return period of 70 years, and a runoff coefficient of 0.8. Considering that the realization of this plan requires a long construction period and high construction costs, the decision was made to proceed by stages. In the first stage, the improvement of the facilities will be based on a rainfall intensity of 75 mm/hr (presently 50 mm/hr), corresponding to a return period of 17 years, and a runoff coefficient of 0.8. In the next stage the facilities will be improved to accommodate a rainfall intensity of 100 mm/hr. In the Nakano and Suginami regions, which suffer frequently from flooding, the plan of improvement based on a rainfall intensity of 75 mm/hr is being implemented before other areas. This facility will be used as a storage sewer for the time being. The Wada-Yayoi Trunk Sewer, as a project of this plan, will have a diameter of 8 m and a 50 m earth cover. This trunk sewer will be constructed considering several constraints. To resolve these problems, hydraulic experiments as well as an inventory study have been carried out. A large drop shaft for the trunk sewer is under construction.

Design Analysis of Shallow Embedded Column Foot of Reactive Powder Concrete Pole

2013 ◽  
Vol 459 ◽  
pp. 582-588
Author(s):  
Yu Zhuo Jia ◽  
Xin Min Yu ◽  
Liang Zhang
Keyword(s):  
Transmission Lines ◽  
Working Condition ◽  
Simulation Analysis ◽  
Reactive Powder Concrete ◽  
Construction Technology ◽  
Operation Condition ◽  
Element Analysis ◽  
Construction Period ◽  
Reactive Powder ◽  
Ansys Workbench

According to the existing specifications, design shallow embedded column foot of 500kV self-supporting partially prestressed reactive powder concrete pole, and perform numerical simulation of column foot stress under actual working condition by using finite element analysis software ANSYS WORKBENCH. Results show that the mechanical characteristic of shallow embedded column foot is good. It can well transmit larger axial pressure, pulling resistance and horizontal force generated by top load of RPC pole. Through the simulation analysis we found that shallow embedded column foot has high safety reliable degree under operation condition, can be used in the current 500 kV transmission lines; In terms of construction technology performance, construction of shallow embedded column foot is simple and quick, can effectively reduce the complexity of construction, shorten the construction period.

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.

Study on Dam Construction Technology without Foundation

2012 ◽  
Vol 170-173 ◽  
pp. 1903-1906
Author(s):  
Hong Xia Wang ◽  
Ya Hui Gao
Keyword(s):  
High Pressure ◽  
Dam Construction ◽  
Construction Technology ◽  
Construction Period ◽  
Speed Up

In the impervious system of dam construction technology without foundation and the cofferdam, the cut-off wall, seepage curtain or high-pressure jet, oblique wall, etc. do not exist. It does not require pumping pit and need a lot of pit excavation. the technology can save a lot of investment and greatly speed up the construction speed, shorten the construction period. To study dam construction technology without foundation, the method is technically feasible, and no adverse consequences, completely meet the project needs.

scholarly journals Research on the Factors of Extremely Short Construction Period under the Sufficient Resources based on Grey- DEMATEL-ISM

2021 ◽  
Author(s):  
Jun-long Peng ◽  
Chao Peng ◽  
Meng-yao Wang ◽  
Ke Hu ◽  
Du-bin Wu
Keyword(s):  
Influencing Factors ◽  
Construction Projects ◽  
Process Model ◽  
Technology Policy ◽  
Grey System Theory ◽  
Construction Technology ◽  
Grey System ◽  
Five Dimensions ◽  
Factors Affecting ◽  
Construction Period

Abstract Under the condition of sufficient resources, there are many factors affecting the realization of extremely short construction period of engineering construction projects. Based on literature review and questionnaire survey, this paper firstly selected 17 influencing factors from the five dimensions of design, management, technology, policy and environment. And the factor analytic hierarchy process model was established based on Grey-DEMATEL-ISM. The model introduced the improved grey system theory and combined decision-making trial and evaluation laboratory (DEMATEL) with interpretative structural modeling method (ISM). In addition, the model can not only identify the critical factors in the system, but also present the internal logical relationship between the influencing factors through the multi-level hierarchical structure diagram. Finally, through the analysis of the influencing factors of extremely short construction period under the sufficient resources, it defined that the key factor is construction technology and the secondary factor is construction safety organization. The research results provide a theoretical basis for managers to realize the extremely short construction period under the sufficient resources.

scholarly journals Research status and trend of comprehensive technology for Multi-storey transportation hub construction

2021 ◽  
Vol 248 ◽  
pp. 03063
Author(s):  
Shi Jing-xian
Keyword(s):  
High Speed ◽  
Great Difficulty ◽  
Construction Technology ◽  
Transportation Industry ◽  
Application Research ◽  
Construction Period ◽  
Research Status ◽  
Construction Organization ◽  
At Home

With the development of China's transportation industry, a lot of expressways have been built, and Multi-storey transportation hubs are built for the interchange of high-speed. Due to the limitation of terrain and traffic, there are many spans in the interchange Multi-storey transportation hub, which has a tight construction period and a great difficulty in construction organization. This paper first sorts out the development and research of comprehensive technology of Multi-storey transportation hub construction at home and abroad, and then analyzes and summarizes the research of Multi-storey transportation hub construction at present, the application research of Swivel Construction Technology in hub project, and the application status of BIM Technology in Multi-storey transportation hub project.

scholarly journals Regulation of the construction period in the Russian Federation

2021 ◽  
pp. 56-62
Author(s):  
Konstantin Evgenevich Salnikov
Keyword(s):  
Production Capacity ◽  
State Regulation ◽  
Theory And Practice ◽  
Construction Sector ◽  
Construction Process ◽  
Construction Costs ◽  
Technical Problems ◽  
Building Regulations ◽  
Construction Period ◽  
Capital Construction

The subject of this research is the regulatory relations arising in the process of reducing construction period as a branch of material production that carries out the erection and reconstruction of buildings and structures of different purposes. The object of this research is the construction sector as a whole; enterprises of various forms of ownership that operate within the investment and construction sector; organizational-legal relations between the parties to the investment and construction process; state regulation in the sphere of capital construction. The aim goal is to examine the key issues in regulating construction period; assess duration of the processes and allocation resources. The author focused on such aspects of the topic as the restricted (recommended) application of building regulations; actualization of the provisions of building regulations with regards to housing construction; development of the time or network schedules for building and construction works; enlarged construction costs standards; factors of variation of the construction period. Special attention is given to the rational variants of organizing the construction process for changing the normative duration based on the made decisions. The scientific novelty is defined by lack of knowledge on the questions of improvement, theoretical, experimental and technical-economic substantiation of technological processes, methods and forms of organizing construction and its production capacity with regards to the problems of reducing construction period. The importance of this work for the national economy lies in studying the theory and practice of reducing construction period, and seeking solutions for the scientific and technical problems of construction through development and creation of the competitive construction technologies and organizational-technological solutions that ensure intensification of the processes of erection, reconstruction, and modernization of buildings and structures while reducing labor, material-technical, fuel and energy resources.

scholarly journals Heat Treatment of Basalt Fiber Reinforced Expanded Clay Concrete with Increased Strength for Cast-In-Situ Construction

Fibers ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 67
Author(s):  
Makhmud Kharun ◽  
Sergey Klyuev ◽  
Dmitry Koroteev ◽  
Paschal C. Chiadighikaobi ◽  
Roman Fediuk ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Compressive Strength ◽  
Basalt Fiber ◽  
Construction Costs ◽  
Construction Period ◽  
Analysis And Evaluation ◽  
Infrared Rays ◽  
Heat Treated ◽  
Increased Strength

Expanded clay concrete (ECC) is a promising structural material for buildings due to its light weight and heat- and sound-insulating properties. Adding basalt fibers (BFs) in ECC reduces its brittleness and enhances its mechanical properties. The heat treatment (HT) of BF-reinforced ECC can significantly accelerate the strength growth during cast-in-situ construction, which allows the reduction of the turnover of the formwork and the construction period, as well as leading to lower construction costs. This paper presents an HT technology for load-bearing structures, containing a BF-reinforced ECC mix and using infrared rays for cast-in-situ construction. The issue of the strength growth of BF-reinforced ECC during HT has been studied. Microsilica and fly ash were added to the ECC mix to obtain a compressive strength of more than 20 MPa. Four different mixes of ECC with chopped BFs in the ratios of 1:0, 1:0.0045, 1:0.009 and 1:0.012 by weight of cement were studied. Test specimens were heated by infrared rays for 7, 9, 11, 13, 16 and 24 h. Then, the heat-treated specimens were tested for compressive strength after 0.5, 4, 12 and 24 h cooling periods. The analysis and evaluation of the experimental data were carried out based on probability theory and mathematical statistics. Mathematical models are proposed for forecasting the strength growth of BF-reinforced ECC during cast-in-situ construction.

Construction Technology Research on Revolving Conical Pullout Anchor

2016 ◽  
Vol 858 ◽  
pp. 10-14
Author(s):  
Jun Chao Ma ◽  
Cheng Bin Yang ◽  
Hong Ming Yu
Keyword(s):  
Reference Values ◽  
Fine Aggregate ◽  
Construction Technology ◽  
Technology Research ◽  
Pullout Capacity ◽  
Aggregate Concrete ◽  
Construction Period ◽  
Anchor Cable ◽  
Drilling Pipe ◽  
Prestressed Anchor

To solve the anti-float problems of underground buildings (structures) more economically, environmentally and effectively. The paper putted forward a construction technology of revolving conical pullout anchors based on researching and improving to the traditional pullout measures. That was a method that the conical anchor head was installed on the drilling pipe and screwed into the stable soil under the influence of drilling pipe. When pulling the drilling pipe, the fine aggregate concrete were poured into the edge. Furthermore, prestressed anchor cable should be strained which connected with the anchor head to keep a good connect with the beam so that it could improve pullout capacity. The conundrums of long construction period and high cost had effectively solved. This technique also had provided great reference values for the congener construction.

Rapid Construction Technology for Railroad Concrete Infrastructure: Microwave Heat Curing Technology

2015 ◽  
Author(s):  
Taehoon Koh ◽  
Seonkeun Hwang ◽  
Junghoon Yoo ◽  
Donggeun Lee
Keyword(s):  
Heating System ◽  
Curing Temperature ◽  
Cold Weather ◽  
Concrete Lining ◽  
Construction Technology ◽  
Construction Process ◽  
Construction Period ◽  
Heat Curing ◽  
Rapid Construction ◽  
Microwave Heat

The cast-in-place concrete lining construction process represents about 25% of the total railroad tunnel construction period. Moreover, the construction period for lining concrete depends on the speed of the curing process of the lining concrete. Therefore, in cold weather when the air temperature in mountain railroad tunnel is consistently 10 degrees or below, equipment for heat insulation of cast-in-place concrete lining, such as a portable fossil fuel heater, must also be prepared to maintain an appropriate curing temperature in the tunnel. It generally takes about 24 to 36 hours to reach the compressive strength (3 to 5MPa) required to remove the lining form. Recently, microwave heat curing technology has been developed as a way of substantially reducing the concrete curing time, to achieve a reduction in the total construction period. The microwave heating system developed in this technology is comprised of a microwave generator, cavity, insulator, and exothermic body (microwave irradiated pyrogen). In this system, microwaves generated from the magnetron are irregularly reflected inside the cavity, and rapidly heat up the exothermic body so that the heat is transferred to the lining form and the concrete in turn, resulting in the accelerated hydration of concrete. Based on the field test data from the construction of the railroad tunnel cast-in-place concrete lining, it is found that this technology is able in 6 to 12 hours to complete the curing of concrete lining sufficiently to remove the form. It is hoped that this approach will substantially reduce the construction period and cost of tunnel lining, even during cold-weather.

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