scholarly journals Design of bridge blasting demolition

2021 ◽  
Vol 352 ◽  
pp. 00002
Author(s):  
Stefan Jangl ◽  
Vladimir Kavicky ◽  
Michal Pilat
Keyword(s):  
Service Life ◽  
Lower Cost ◽  
Construction Safety ◽  
The Other ◽  
Safety Control

The paper presents the design of bridge blasting demolition scheme. The blasting methods has become the preferred method for bridge demolition not only in war period but also where bridge service life is exceeded. Compared with the other demolition method, blasting evince more advantages as higher demolishing progress, lower cost and easier construction safety control. The design of bridge blasting demolition scheme contents blasting position, blasting parameters and safety protections.

High temperature / radiation hardened capable ARM® Cortex®-M0 microcontrollers

2016 ◽  
Vol 2016 (HiTEC) ◽  
pp. 000046-000050
Author(s):  
R. Bannatyne ◽  
D. Gifford ◽  
K. Klein ◽  
C. Merritt
Keyword(s):  
High Temperature ◽  
Lower Cost ◽  
Cmos Technology ◽  
The Other ◽  
Device Performance ◽  
High Radiation ◽  
Plastic Package ◽  
Radiation Hardened ◽  
Temperature Radiation ◽  
On Chip

Abstract VORAGO Technologies has developed a pair of ARM Cortex M0 MCUs designed from the ground up to be high temperature capable. One of these devices is specifically developed for high temperature applications, the other adds capabilities that make it suitable for use in high radiation environments as well. These devices are fabricated using a modified version of commercial bulk 130nm CMOS technology utilizing our HARDSIL® technology, which provides immunity to the increased effects of latchup and EOS encountered at higher application temperatures. In addition to the processor these devices include features more typical of low temperature SoCs including on-chip memory, timers, and communications peripherals. In addition to the ceramic package and die format typically utilized at high temperature, a new lower-cost plastic package is available that has been characterized at higher temperatures. These devices have been characterized at temperatures up to 200C and results showing the latchup behavior and device performance are provided. Some of the tradeoffs involved in creating such devices are discussed, as well as some of the similarities and tradeoffs in creating a radiation hardened devices vs. a high temperature device.

scholarly journals Method for a cloud based remaining-service-life-prediction for vehicle-gearboxes based on big-data-analysis and machine learning

2020 ◽  
Vol 84 (4) ◽  
pp. 305-314
Author(s):  
Daniel Vietze ◽  
Michael Hein ◽  
Karsten Stahl
Keyword(s):  
Machine Learning ◽  
Big Data ◽  
Service Life ◽  
Operating Time ◽  
The Other ◽  
Learning Approaches ◽  
State Of Health ◽  
Remaining Service Life ◽  
Other Hand ◽  
The One

AbstractMost vehicle-gearboxes operating today are designed for a limited service-life. On the one hand, this creates significant potential for decreasing cost and mass as well as reduction of the carbon-footprint. On the other hand, this causes a rising risk of failure with increasing operating time of the machine. Especially if a failure can result in a high economic loss, this fact creates a conflict of goals. On the one hand, the machine should only be maintained or replaced when necessary and, on the other hand, the probability of a failure increases with longer operating times. Therefore, a method is desirable, making it possible to predict the remaining service-life and state of health with as little effort as possible.Centerpiece of gearboxes are the gears. A failure of these components usually causes the whole gearbox to fail. The fatigue life analysis deals with the dimensioning of gears according to the expected loads and the required service-life. Unfortunately, there is very little possibility to validate the technical design during operation, today. Hence, the goal of this paper is to present a method, enabling the prediction of the remaining-service-life and state-of-health of gears during operation. Within this method big-data and machine-learning approaches are used. The method is designed in a way, enabling an easy transfer to other machine elements and kinds of machinery.

Proactive Construction Safety Control: Measuring, Monitoring, and Responding to Safety Leading Indicators

2013 ◽  
Vol 139 (10) ◽  
pp. 04013010 ◽  
Author(s):  
Matthew R. Hallowell ◽  
Jimmie W. Hinze ◽  
Kevin C. Baud ◽  
Andrew Wehle
Keyword(s):  
Construction Safety ◽  
Leading Indicators ◽  
Safety Control

Construction Safety Control and Management on Extra-Large Underwater Caisson in Taizhou Bridge

2013 ◽  
Vol 361-363 ◽  
pp. 1124-1128
Author(s):  
Xiao Yong Liu ◽  
Xin Wang ◽  
Er Qiang Zhang
Keyword(s):  
Suspension Bridge ◽  
Construction Safety ◽  
Type Structure ◽  
Control Technology ◽  
Three Dimension ◽  
Safety Control ◽  
Underwater Positioning ◽  
The World ◽  
New Type ◽  
Control And Management

The new-type structure of "three towers of two-span" suspension bridge with the main span of 2×1080m is put to use in Taizhou Bridge. The foundation of Middle Tower adopts an extra-large underwater caisson structure with the three dimension size about 58m×44m×76m, which has been so far the deepest underwater caisson in the world. The caisson is divided into two sections, that is, Steel Caisson on the bottom and Concrete Caisson on the top. The underwater positioning, landing of Steel Caisson and the height addition construction of Concrete Caisson are of great construction difficulties and thus brought high safety risk. In this paper, Taking Taizhou Bridge as background, the safety control technology and management of underwater caisson construction is presented, which can play a good reference for similar projects.

Stability and Safety Analysis of Braced Excavation for Subway Station during Construction under the Condition of Side Slope

2011 ◽  
Vol 99-100 ◽  
pp. 1166-1170 ◽  
Author(s):  
Yuan Hai Li ◽  
Ping Liu ◽  
Ji Qiang Liu ◽  
Xue Feng Han
Keyword(s):  
Safety Analysis ◽  
Construction Safety ◽  
The Other ◽  
Steel Pipe ◽  
Subway Station ◽  
Stability Coefficient ◽  
Braced Excavation ◽  
Side Slope ◽  
The Stability ◽  
Design And Construction

The main purpose of this paper is to analyze the stability and safety problems of braced excavation enclosure, surrounding strata and side slope during construction of Shangshuijing station in Shenzhen Metro Line 5. The paper presents stability discrimination of the braced excavation and side slope by discussing their force and deformation regularity using Flac3D, and puts forward some project proposals about its design and construction. The results show that: (1) The stability coefficient of braced excavation enclosure becomes smaller because of biasing impact of side slope, but this project can meet the stability requirements, (2) The biasing impact of side slope has little influence on deformation of surrounding strata starting on the other side of braced excavation without slope, and (3) To ensure construction safety under condition of side slope, the braced excavation should be excavated starting from the zone far from the side slope, steel pipe can be used as assistant reinforcement at the corner of side slope if necessary.

scholarly journals Reuse of red ceramic waste in the production of concrete for civil construction

2021 ◽  
Vol 10 (12) ◽  
pp. e536101220967
Author(s):  
Heberson Teixeira da Silva ◽  
Luély Souza Guimarães ◽  
Fernanda Andrade Dutra ◽  
Dayanne Caldeira Martins ◽  
Dilceu Silveira Tolentino Júnior ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Large Scale ◽  
Lower Cost ◽  
The Other ◽  
Partial Replacement ◽  
Uniaxial Compression Test ◽  
Ceramic Waste ◽  
Renewable Natural Resources ◽  
Excessive Consumption ◽  
Compressive Strength Of Concrete

In search of the reuse of waste from civil construction, studies are presented as an alternative on the insertion of this waste into materials so that they become ecologically viable and at a lower cost. In this scope, there is the red ceramic waste (RCW), which is largely produced both in renovation works and in the stage of transporting construction components such as bricks, slabs, and floors. On the other hand, the use of cement is of great proportions, which raises concerns about the excessive consumption of non-renewable natural resources, especially in large-scale projects. Thus, the study aimed to evaluate the mechanical properties of compressive strength of concrete with partial replacement of cement by RCW and to verify the influence at different breakage ages (7, 14, 21, and 28 days). Five mixes were used, the first with 100% cement, and the others with crushed RCW to replace 5%, 10%, 15%, and 20% of the cement, and the resistance obtained according to percentages and ages was also verified of RCW through the uniaxial compression test. Thus, it was observed that for replacements of up to 15%, the strength losses were not significant, suggesting the feasibility of its use in works with high concrete demands, such as in dams.

scholarly journals The Influence of Ice-Resistant Coatings Characteristics to the Energy Efficiency of Ice-Going Ships

2021 ◽  
Vol 320 ◽  
pp. 01007
Author(s):  
V.A. Veselov ◽  
M.V. Kitaev ◽  
P.O. Pastukhov ◽  
O.E. Surov
Keyword(s):  
Energy Efficiency ◽  
Friction Coefficient ◽  
Power Plant ◽  
Service Life ◽  
Frictional Resistance ◽  
Experimental Tests ◽  
Operating Conditions ◽  
The Other ◽  
Low Friction ◽  
Ice Navigation

The main purpose of ice-resistant coatings designed for icebreakers and ice navigation ships is the ability to protect of the ship’s hull in the most severe operating conditions. The special coatings certified by the Classification Societies for ice abrasion can provide this protection. These coatings allow to reduce the required thickness of the ship’s hull and reduce the construction weight of the ships. On the other hand, these coatings must have a low friction coefficient, which reduce the frictional resistance of the hull on ice and fuel consumption, increase the service life of the ship and power plant, reduce CO2 emissions into the atmosphere and affect to the operational and economic efficiency of the ship. In this paper, we present the results of experimental tests of friction coefficient on ice for various types of ice-resistant coatings and analysis the influence of ice-resistant coatings characteristics to the energy efficiency of ice-going ships.

Failure Analysis Power Cycling Tool – FAPCT

2010 ◽  
Author(s):  
Yi Yun Chua
Keyword(s):  
Failure Analysis ◽  
Lower Cost ◽  
The Other ◽  
Hardware Cost ◽  
Power Cycling ◽  
User Friendly

Abstract One of the problems for failure analysis (FA) is to perform power cycling to stress the motherboard in order to duplicate the failure. The other problem is the timing is not synchronizing correctly. For this purpose, a user-friendly with extra feature program called Failure Analysis Power Cycling Tool (FAPCT) was developed to resolve problems associated with power cycling and enhance the AC cycling tools, which is more suitable for FA purpose. With this hardware and software, the FAE is provided one more option to duplicate intermittent or other issues that need to do power cycling to capture the failure. The hardware cost is only about 600 USD, which is consider at the lower cost hardware for a FA tools to do power cycling although there is some limitation compare to some hardware available in the market.

Wood Splitting Machine for Tea and Bakery Industries

2021 ◽  
Author(s):  
W.K. Lankapura ◽  
◽  
K.G. Alahapperuma ◽  
Keyword(s):  
Sri Lanka ◽  
Rural Areas ◽  
Lower Cost ◽  
The Other ◽  
Food Preparation ◽  
Household Food ◽  
Almost All ◽  
Hydraulic Devices ◽  
Rural Industries ◽  
Fire Wood

In Sri Lanka, firewood is regarded as a common conventional fuel, mainly in food preparation purposes. Essentially due to economically availability, firewood has still been using as the main source to lit fire in rural areas. Other than for household food preparation, firewood is still the main source of generating heat in food related rural industries, such as tea factories, bakeries, hotels etc. In tea factories and in some of the bakeries, firewood is used in mass scales. Even tons of fire wood is used in each of them, per day. To make easy burning, the wood logs need to be cut in to small pieces. In almost all such places, wood splitting is done manually. It finds very difficult to split wood logs by using an axe. This needs time and more manpower. On the other hand, an additional cost is involved for workers’ payment. If the wood splitting can be mechanized, it may be huge beneficial for such industries as tea factories and bakeries etc. Therefore, this project is aimed to introduce a wood splitting machine, which has the specific objectives of efficient supply of usable level firewood at a shorter time with lower cost and without much manpower to split firewood logs. Lower maintenance requirement together with lower failure frequencies may be added advantages, when compared to the hydraulic devices [4].

Sign in / Sign up

Export Citation Format

Share Document