Construction Technical Measures and Control of Concrete Temperature Cracking for a Mass Flat Plate Type Raft Foundation

2014 ◽  
Vol 484-485 ◽  
pp. 717-721 ◽  
Author(s):  
Jing Liang Yu ◽  
Dong Yang
Keyword(s):  
Foundation Engineering ◽  
Construction Technology ◽  
Temperature Changes ◽  
Raft Foundation ◽  
Concrete Temperature ◽  
Temperature Parameter ◽  
Slab Foundation ◽  
And Control ◽  
Foundation Structure ◽  
Plate Type

The mass flat raft foundation Section is large and Cement is in large quantities, the temperature changes in the larger cement hydration heat of the water releasing, the temperature stress is main reason reducing cracking. According to the basement of a project of Guangzhou large slab raft foundation engineering as an example, Discussing the construction technology measures of early crack of large volume concrete of raft plate in the process of construction,. The results show that it Can effectively prevents the slab foundation structure cracking and achieves good results through controlling Concrete materials and concrete temperature Parameter such as the lifting machine temperature and the pouring temperature and the expansion joint or the whole pouring length.

Planning and Control in Construction of LW3-1 Jacket

2013 ◽  
Vol 467 ◽  
pp. 277-281
Author(s):  
Shao Ning Han ◽  
Hong Wang ◽  
Hang Wu ◽  
Pi Song Sun ◽  
Yu Hui Xue ◽  
...  
Keyword(s):  
Quality Control ◽  
Process Control ◽  
Deep Water ◽  
Construction Technology ◽  
Structural Dimension ◽  
Planning And Scheduling ◽  
Comprehensive Management ◽  
Planning And Control ◽  
Traditional Classification ◽  
And Control

According to Chinese traditional classification, large-sized jackets weight over 10,000 tons and stand in over 100-meter water. Large-sized jackets are different from the normal in construction tonnage, structural dimension and quality control requirements as well as construction difficulty. More complicated construction technology and programme, higher grade of materials, stricter control requirements on node weld and higher risks all need matched stricter, more meticulous and more comprehensive management in planning and scheduling. Combined with construction of LW3-1 deep-water jacket, this paper describes the planning, tracking progress, process control and optimization.

Quality Control of Envelope Insulation Building under Construction

2011 ◽  
Vol 71-78 ◽  
pp. 78-81
Author(s):  
Yun Xue ◽  
Guo Ming Dong ◽  
Hui Xia Wen
Keyword(s):  
Energy Saving ◽  
Implementation Process ◽  
Building Energy ◽  
Construction Technology ◽  
High Consumption ◽  
Building Energy Saving ◽  
Energy Saving Technology ◽  
Under Construction ◽  
And Control ◽  
Technical Measures

China building energy-saving technology is in the early stages of the development with energy high consumption and low energy efficiency. It is especially important to control each link of the building energy-saving for energy conservation. In construction of the envelope structure exists Some prominent effects ，such as the compilation and implementation of the construction technology, the review of design alteration, the performance measurement of materials and components, and control of construction technical measures, we should be implemented related inspection and control in all stages of the implementation process.

scholarly journals Noise Source Identification of a Ring-Plate Cycloid Reducer Based on Coherence Analysis

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Bing Yang ◽  
Yan Liu
Keyword(s):  
High Performance ◽  
High Reliability ◽  
Coherence Analysis ◽  
Noise Sources ◽  
Ring Plate ◽  
Speed Reducer ◽  
Noise Test ◽  
Analysis System ◽  
And Control ◽  
Plate Type

A ring-plate-type cycloid speed reducer is one of the most important reducers owing to its low volume, compactness, smooth and high performance, and high reliability. The vibration and noise tests of the reducer prototype are completed using the HEAD acoustics multichannel noise test and analysis system. The characteristics of the vibration and noise are obtained based on coherence analysis and the noise sources are identified. The conclusions provide the bases for further noise research and control of the ring-plate-type cycloid reducer.

An In-Depth Look at the Effectiveness of Smart Materials for Monitoring and Control of Composite Structural Panels

2002 ◽  
Author(s):  
Mark Riley ◽  
Farid Taheri
Keyword(s):  
Fiber Optics ◽  
Smart Materials ◽  
Maintenance Cost ◽  
Monitoring And Control ◽  
Temperature Changes ◽  
Reinforced Composite ◽  
Operations And Maintenance ◽  
Day To Day Operations ◽  
And Control ◽  
Marine Vessels

In recent years the field of smart structures, including sensing and control, has been growing at an extraordinary rate. As of today, however, there has been relatively little work performed in applying this technology for monitoring and control of offshore and marine structures. In offshore environment, structures are subjected to critical loading cycles (e.g., wave action, temperature changes, and heavily corrosive environment to name a few), unparalleled to those in any other environment. With the costs that are associated with the manufacturing of marine vessels and structures, and their day-to-day operations and maintenance cost, the selection of an effective method of monitoring their performance and integrity, as well as their control is of paramount importance. In this paper, we will present a brief, yet detailed description of the different smart materials that are available for structural monitoring and control, such as electrorheological fluids, shape memory alloys, fiber optics, piezoelectrics, and magnetostrictives. We will also discuss the applications of these materials, including their advantages and shortfalls. The outlined discussion will help the reader to select the most optimum smart material for a given application. The paper will further discuss an ongoing investigation of a piezoelectric system that is currently being developed for implementation into fiber-reinforced composite panels used in marine vessel applications.

Thermodynamic Characterization and Dynamic Simulation of a Micro Algae Air Lift Photobioreactor

2011 ◽  
Author(s):  
Adrian Avila ◽  
Antonio Bula ◽  
Rafael Go´mez ◽  
Jorge Mendoza ◽  
Arnaldo Verdeza
Keyword(s):  
Pid Controller ◽  
System Analysis ◽  
Energy Content ◽  
Ambient Conditions ◽  
Promising Alternative ◽  
Thermodynamic Characterization ◽  
Temperature Changes ◽  
Algae Growth ◽  
Linear Differential ◽  
And Control

Micro algae production as a source of fatty biomass that can be used to produce biofuels is a promising alternative that needs to be thoroughly evaluated. The tendency to increase production and energy content and to reduce water usage has had an impact in the development of photobioreactors, due to the versatility of this equipment to control and optimize the production parameters. This system requires an adequate scheme for monitoring and controlling the variables such as temperature, light intensity, carbon dioxide and oxygen supply, in order to guarantee the micro algae growth. This paper presents a control strategy for algae growth in an airlift photobioreactor. A thermodynamic characterization was performed and the dynamic behavior of the system is modeled for system analysis and control. A mathematical model is developed using the equations describing the process. A PID controller is set to evaluate the parameters that control algae growth. The results show that the photobioreactor presents a substantial sensitivity to room temperature changes, and this is considered as the main disturbance of the process. For the dynamic characterization a non-linear differential equations-based model was developed, and after tuning a PID controller it was found that the system was robust to changes in ambient conditions.

Research on Mass Concrete Construction Techonogy of Raft Foundation of Hongyun Building

2013 ◽  
Vol 690-693 ◽  
pp. 709-713 ◽  
Author(s):  
Su Hua Yin ◽  
Yuan Huang ◽  
Ying Hui Yuan
Keyword(s):  
Temperature Control ◽  
Mass Concrete ◽  
Construction Technology ◽  
Concrete Construction ◽  
Core Tube ◽  
The Core ◽  
Raft Foundation ◽  
Concrete Base

The foundation of A tower of Hongyun building is made of raft board foundation which is 4200mm in the thickness and 3500mm beside side of the core tube. It is researched that the raft foundation mass concrete construction technology is expatiated from temperature and cracks of the raft foundation and the temperature control and monitoring of the concrete base slab construction and concrete curing.

scholarly journals Analysis on Construction Technology and Reinforcement Technology of Building Foundation

2021 ◽  
Vol 5 (6) ◽  
pp. 38-41
Author(s):  
Hua Guo
Keyword(s):  
Critical Role ◽  
Foundation Engineering ◽  
Construction Technology ◽  
Construction Engineering ◽  
Foundation Construction ◽  
Building Foundation ◽  
Safety And Stability

In the field of construction engineering, foundation engineering plays a critical role. In actual construction, we must first effectively regulate the foundation construction to ensure the safety and stability of the entire building in order to improve the overall quality of the project. It's also important to look into the technologies that go into building foundations. The construction technology and reinforcing technology of building foundations are examined in this study as a reference.

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