The Application and Construction of Light Steel Roof Truss in the Hydropower Station Tunnel

2012 ◽  
Vol 538-541 ◽  
pp. 3160-3164
Author(s):  
Xiao Ping Wang ◽  
Qi Tao Zhan ◽  
Jie Xu
Keyword(s):  
Operation Time ◽  
Field Investigation ◽  
Installation Space ◽  
Hydropower Station ◽  
Tunnel Construction ◽  
Space And Time ◽  
Power House ◽  
Assembly Area ◽  
Roof Truss ◽  
Steel Roof

The hydropower station tunnel construction is crossover operation and environment is poor. Installation space and time are limited. The paper introduces corresponding measures and installation method.Through field investigation and vast demonstration, using electric hoist and little bridge machine in equipment assembly area can avoid the effect to power house equipment installation and reduce crossover operation time. Using installation platform on the little bridge in hydro-generator area can reduce the use of the little bridge machine and improve the installation efficiency .

scholarly journals Evaluation of the Influence Caused by Tunnel Construction on Groundwater Environment: A Case Study of Tongluoshan Tunnel, China

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Jian Liu ◽  
Dan Liu ◽  
Kai Song
Keyword(s):  
Indicator System ◽  
Field Investigation ◽  
Assessment Method ◽  
Tunnel Construction ◽  
Moderate Degree ◽  
Tunnel Excavation ◽  
Construction Period ◽  
Environmental Investigation ◽  
Groundwater Environment

Problems related to water inflow during tunnel construction are challenging to designers, workers, and management departments, as they can threaten tunneling project from safety, time, and economic aspects. Identifying the impacts on groundwater environment resulting from tunnel drainage and making a correct assessment before tunnel construction is essential to better understand troubles that would be encountered during tunnel excavation and helpful to adopt appropriate countermeasures to minimize the influences. This study presents an indicator system and quantifies each indicator of Tongluoshan tunnel, which is located in southwest China with a length of 5.2 km and mainly passes through carbonate rocks and sandstones, based on field investigation and related technological reports. Then, an evaluation is made using fuzzy comprehensive assessment method, with a result showing that it had influenced the local groundwater environment at a moderate degree. Information fed back from environmental investigation and hydrologic monitoring carried out during the main construction period proves the evaluation, as the flow of some springs and streams located beside the tunnel route was found experiencing an apparent decline.

scholarly journals The Role of Water and Lithology on the Deformation and Failure of an Anaclinal Rock Slope in a Hydropower Reservoir

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Ming-liang Chen ◽  
Peng-fei Lv ◽  
Wen-ze Nie ◽  
Chang-ming Tan ◽  
Zhi-hua Bai ◽  
...  
Keyword(s):  
Traffic Safety ◽  
Deformation Process ◽  
Human Life ◽  
Field Investigation ◽  
Global Navigation Satellite Systems ◽  
Tectonic Activity ◽  
Hydropower Station ◽  
Crushed Rock ◽  
Surface Zone ◽  
Protection Measures

A series of settlement, cracking, and collapse of the Zhengjiaping slope has been increasingly developing since October 2015 during impoundment at the Dagangshan Hydropower Station. It is a dangerous signal, which means thatlandslide potential will be existed for the Zhengjiaping slope and poses greatthreat to the operation of hydropower station and traffic safety. Related slope protection measures and research studies have been implemented accordingly in the Zhengjiaping slope to prevent and control adverse influences on property security and human life in the reservoir area. In order to understand the geological and hydrological settings of the Zhengjiaping slope and its surroundings, a field investigation was carried out to determine the lithological composition and toppling/sliding deformation characteristics using exploratory adit and site boreholes. The large deformation process in the apparently deformed area was analyzed using borehole inclinometers and global navigation satellite systems (GNSS). It was found that the apparently deformed area zone was characterized by crushed rock masses, with only a small amount of slope deposits and the sliding deformation occurring in Zone I. The deformation process of the reservoir landslide was considered to be a complex integration of the geological effects of various adverse factors. Impoundment and heavy rainfall are the direct causes of sliding deformation. During the preparation of the basic conditions for sliding, lithology, tectonic activity, and artificial disturbances play an important role, including the sliding mass and the sliding surface zone.

Shoe-Pots, Patajos, and the Principle of Whimsy

1976 ◽  
Vol 41 (3) ◽  
pp. 386-391
Author(s):  
Keith A. Dixon
Keyword(s):  
Field Investigation ◽  
The Other ◽  
Broad Category ◽  
Space And Time ◽  
Single Criterion

The traditional broad category of shoe-shaped pots (or bird-forms or patojos) is invalid for analytic purposes. It is a catch-all category for vessels which may have had different histories, uses, and meanings. One kind, the culinary shoe-pot, does form a distinctive class with a special use in cooking and was widely distributed in space and time. Previous researchers, including Varner, Beals, and Sisson most recently, have generated spurious problems and have been led to erroneous conclusions. The following recommendations are explained: (1) culinary shoe-pots should not be classified with bird or foot effigies, although they sometimes become effigies as visual puns; (2) they should not be grouped with other asymmetrical pots on the single criterion of horizontal body elongation without considering the other vessel attributes; (3) further ethnographic and linguistic field investigation should be done where culinary shoe-pots are still used; (4) primary and secondary uses of culinary shoe-pots should not be confused.

24m Steel Roof Truss Static Test Research of Changchun FAW-Volkswagen Golf Shop

2012 ◽  
Vol 517 ◽  
pp. 928-931
Author(s):  
Yan Min Yang ◽  
Xiao Juan Xie
Keyword(s):  
Stress State ◽  
Intersection Point ◽  
Simple Construction ◽  
Static Test ◽  
Roof Truss ◽  
Chord Member ◽  
Actual Stress ◽  
The Web ◽  
Good Agreement ◽  
Steel Roof

The steel roof truss rod is widely used in Chinese building industrue, because of the reasonable force, the design and simple construction, the good economic indicators, attractive appearance and many other advantages. Based on a pin 24m steel roof truss static test research and the results, which is based on the rigid and hinged to calculate, show that the steel roof truss which has the property that the web member axis intersection point and the chord member centroid are coincident, is in a good agreement according the calculation of rigid or hinge compared with the actual stress state.

Structural behaviors of steel roof truss exposed to pool fire

2012 ◽  
Vol 19 (7) ◽  
pp. 2054-2060 ◽  
Author(s):  
Chang-kun Chen ◽  
Wei Zhang
Keyword(s):  
Pool Fire ◽  
Roof Truss ◽  
Structural Behaviors ◽  
Steel Roof

scholarly journals Analisa Produktivitas Tenaga Kerja Pada Pekerjaaan Rangka Atap

2019 ◽  
Vol 5 (2) ◽  
pp. 20-27
Author(s):  
Mulyadi Mulyadi ◽  
Hasnawati Hasnawati ◽  
Muhammad Ridha
Keyword(s):  
Building Construction ◽  
Construction Work ◽  
Work Time ◽  
Lightweight Steel ◽  
Work Volume ◽  
Roof Truss ◽  
Implementation Time ◽  
Type C ◽  
Object Of Study ◽  
Steel Roof

Productivity is an important factor in determining the success of a construction work. Increased productivity will reduce work time, and that means it will reduce costs. In general, the value of productivity is determined by the factor of the volume of work, implementation time, and the number of workers. In order to get the job done well, a planning effort is needed by paying attention to these factors. For this reason, this study was conducted to determine the value of productivity in one component of building construction work, namely lightweight steel roof truss work. The object of study was the work of lightweight steel roof truss 4 (four) project sites, namely the 4 x 25 Shop Houses Construction Project in Meulaboh, West Aceh, the Building of the Rector & Administration Bureau Building of STKIP Bina Bangsa Getsempena Banda Aceh, the Construction of the Getsempena Lhoksukon North Aceh STIKES Building and the Construction of North Aceh RIKI STIKes Building, Bina Nusantara Idi, East Aceh. The roof truss material used is type C Truss 75 0.75 Thickness. The volume of roof truss work is planned to be 2022.38 m2. The study was conducted through field observations by directly recording the volume of work, the duration of each stage of work, and the number of workers involved. The results of the analysis show that the productivity value for roof truss works is obtained by an average of 2,062 m2 / hour or 16,499 m2 / day. In the implementation of roof truss work, the amount of labor used is the same in all segments, so the value of productivity tends to be determined by the magnitude of the ratio between the volume of work and the effective time of implementation. Thus, if the amount of work volume can be completed in a shorter time then the value of productivity will increase

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