civil engineering practice - dr.a.shah · q earthwork rates for machines are ... advantages &...
TRANSCRIPT
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2
Civil Engineering Practice
Labor vs Machinery Instructor:
Dr. Attaullah Shah
Lecture # 2
Department of Civil Engineering
Swedish College of Engineering and Technology-Wah Cantt.
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TYPES OF LABOR
SKILLED LABOR UNSKILLED LABOR
MANUAL LABOR MECHANICAL LABOR
LABOR
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MECHANICAL LABOR
• MAY BE DESCRIBED AS HEAVY
MACHINERY OPERATED BY FUEL AND
ELECTRICITY.
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MANUAL LABOUR
• HUMAN AND ANIMAL POWER
ASSISTED BY SIMPLE IMPLEMENTS
LIKE WHEEL BARROWS, NORMAL
PICK AXE AND SPADE ETC.
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SKILLED LABOR
• Includes persons having training inperforming jobs needing skill e.g:operators of mechanical and electricalequipments, drivers of all kinds , masons ,carpenters, electricians, blacksmiths etc.
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UNSKILLED LABOUR
• not requiring any particularskill e.g., laborers, helpers,mates, cleaners, oilmen,greasers, etc.
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ADVANTAGES OF MANUAL LABOUR
q Improves the economic conditions ofcommon people of the project area.
qIncreases the circulation of the moneyand the per capita income of the people.
q Earthwork rates for machines areinvariably higher than the correspondingrates through manual labor.
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MANUAL LABOUR VS CONSTRUCTION MACHINERY
• Here we will discuss the interaction between manual labor and construction machinery for different construction works separately.
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EXCAVATION
MACHINERY
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POWER SHOVEL
• used primarily to excavate earth andland it into trucks or tractor-pulledwagons or on the conveyer belts.
• may be mounted on crawler trucks andrubber tired wheels. But power shovelsmounted on rubber tired wheels havehigh speed w.r.t. crawler mounted units.
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CLASSIFICATION
POWER SHOVEL
FRONT SHOVEL
BACK HOE
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FRONT SHOVEL
• A front shovels bucket excavates inupward direction. It develops excavationbreakout force by crowding material awayfrom the machine. It is used to excavateabout the earth surface.
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BACK HOE
• A backhoe is in the form of a downwardare unit. It develops exaction breakoutforce by pulling the bucket toward themachine and curling the bucket inward.It is used to excavate below the earthsurface.
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FRONT SHOVEL
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FRONT SHOVEL
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BACK HOE
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BACK HOE
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SIZE OF A POWER SHOVEL
The size of a power shovel is indicated bythe size of the bucket, expressed in cubicyards. Power shovels are commonlyavailable in the following sizes: 3/8, 0.5,0.75, 1, 1.25, 1.5, 2 and 2.5 cub. Yds.
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APPLICATIONS
1. Embankment Digging
2. Loading into Haul Units
3. Side Casting
4. Dressing Slopes
5. Dumping on Soil Banks
6. Digging Shallow Trenches
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DRAG LINES
• It is a excavating unit to excavate earthand load it into hauling units, such astrucks or wagons or to deposit it inlevees, dams and spoil banks near the pitsfrom which it is excavated.
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23
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TYPES OF DRAG LINE
• Draglines may be dividedinto the following types:
1. Crawler–mounted
2. Wheel–mounted
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DRAG LINEADVANTAGE• it can be used over soft soil, when water
for handling loose, dry sands and graveland occurs at some distance below thesurface.
DISADVANTAGE• its output is lower than power shovel.
APPLICATIONS1. Bulk Pit Excavation
2. Digging Canal or a Ditch or near a pit
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DRAG LINE
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TRACTOR PULLED SCRAPERS
It is a excavating as well as carrying units.Tractor-pulled scrapers have establishedan important position in the earth movingfield.
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TYPE OF TRACTOR PULLED SCRAPERS
There are two types of tractor – pulled scrapers.
1.Crawler - Tractor Scrapers
2. Wheel - Tractor Scrapers
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1. CRAWLER - TRACTOR SCRAPERS
It is used for short haul distances, the crawler type tractor, pulling a rubber typed self loading scraper can move earth economically.
DISADVANTAGE
It has low speed w.r.t. wheel tractorscraper.
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WHEEL TRACTOR SCRAPERS
• It is used for long hauldistances; the higher speed of a wheeltype tractor pulled scraper will permit itto move earth more economically thanwith the crawler type tractor. Itsloading speed is lower w.r.t. crawlertractors but higher travel speed, willoffset this disadvantage.
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ADVANTAGES OF USE OF EXCAVATORS OVER
MANUAL LABOURS
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ADVANTAGES & DISADVANTAGE
• Excavators can excavate earth oversurface as well as below the earth surface
• Their excavation speed is high ascompared to use of manual labor.
• They can excavate soft soil, hard rockystrata canals, tunnels etc.
Disadvantage• Its use increase the cost factor. This
disadvantage is not so prominent becauseits use decrease the time of completion ofa project.
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EXCAVATION BY HAND
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EXCAVATION BY HAND
• Generally, it is desirable to use excavating equipment instead of excavation by laborers, however, at some jobsites the space is not
sufficient for equipment to operate.
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BULLDOZER
The term Bulldozer may be used in abroad sense to include both a bulldozerand an angle dozer. Bulldozers aremounted with the blades perpendicularto the direction of travel, while Angledozers are mounted with the blades setan angle with the duration of travel.
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BULLDOZER
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CLASSIFICATION
• On the basis of their mountings:
1. Crawler Tractor mounted
2. Wheel – Tractor mounted.
On the basis of lowering and rising theirblade, Bulldozer may be classified as cableor hydraulic controlled.
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APPLICATIONS/USES
1. Clearing land from timber andstumps.
2. Opening up pilot roads throughmountains and rocky terrain.
3. Moving earth for haul distances up toapproximately 300 feet.
4. Spreading earth fills
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APPLICATIONS/USES
5. Back filling trenches.
6. Clearing construction sties off debris.
7. Maintaining haul roads.
8. Clearing the floors of borrow andquarry pits.
9. Excavating ponds for stock water.
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COMPACTIONMACHINERY
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COMPACTION TECHNIQUES
Compaction is attained by applying energy to a soil by one of the following methods:
1- Kneading
2- Static Weight.
3- Vibration
4- Impact
5- Explosives
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TYPES OF COMPACTING ROLLERS
1 - PLAIN/FLAT WHEALED ROLLER
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TYPES OF COMPACTING ROLLERS
1 - PLAIN/FLAT WHEALED ROLLER
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TYPES OF COMPACTING ROLLERS
2- TAMPING ROLLER / SHEEP'S FOOT ROLLER
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Tandem Rollers
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MANUAL COMPACTION
LABOUR
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MANUAL COMPACTION
If necessary, soil compaction can also be done manually.
• THE RATE OF COMPACTION AND THE CHOICE OF LABOR DEPENDS UPON
• TYPE OF SOIL
• NUMBER OF LABORERS AVAILABLE
• TYPE OF EQUIPMENT USED
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HAULINGMACHINERY
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TRUCKS AND WAGONS
INTRO.
Hauling is the transportation of materialby mobile units over highways or countryroads. Transportation includes movementover rail, road or water; but hauling is aterm confined to the movement overroads such as with trucks, trailers orwagons.
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TYPES OF TRUCKSTrucks may be classified according to
• Size and type of engine, gasoline, diesel, butane, propane etc
• Number of gears.
• Kind of drive, two wheel, four wheel, six wheels etc.
• Number of wheels and axles
• Method of dumping the load, rear dump, side dump
• Class of material hauled, earth, rock etc.
• Capacity in tons or cubic yards.
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Truck and Asphalt Paver
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TRUCKS
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Concrete Placing Booms
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MANUAL TRANSPORTATION
LABOUR
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MANUAL TRANSPORTATION
FOR MANUAL TRANSPORTATION OF MATERIALS, LABOR CAN ALSO BE USED
THE RATE OF TRANSPORTATION MAILNLY DEPENDS UPON
• TYPE OF EQUIPMENT USED AND
• NUMBER OF LABORER AVAILABLE
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MANUAL TRANSPORTATION
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CONCRETE MIXING
MACHINERY
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CONCRETE MIXERS
INTRODUCTION.
Concrete mixers are used for mixing all the ingredients of concrete to make a mix of specified consistency
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CONCRETE MIXERS
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MIXER SIZES
• B.S. 1305 specifies the followingstandard sizes for batch type mixers:
• Tilting mixers: 3.5 T, 5T, and 7T,
• Non-tilting mixers: 5NT.7NT.10NT.14HNT 28NT. 56NT.
(The numbers indicate the mixed batchcapacity in cubic feet.)
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CONCRETE MIXING TRUCK
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Portable Concrete Batching Plant & Fixed Concrete Batching
Plants
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MANUAL MIXING OF CONCRETE
DISADVANTAGESDISADVANTAGES OF MANUAL MIXING OF CONCRETE
ARE
• IN MOST OF OUR SMALL PROJECTS THE MIXINGOF CONCRETE IS MAINLY DONE MANUALLY.
• REDUCTION IN STRENGTH• SEGREGATION OF COARSE AND FINE AGGREGATES• INCOMPLETE MIXING CAUSES NON UNIFORMITY
OF CEMENT IN CONCRETE. • FALSE SET OF CEMENT• WAISTAGE OF CEMENT SAND SLURRY• REDUCTION IN WORKABILITY OF CONCRETE
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VIBERATORS
MACHINERY
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VIBERATORS
Vibration is generally accepted as an economical, labour saving and quality improving method of compaction, which is used in most of concrete jobs. It is especially adapted to the stiffer consistencies associated with high quality conceit.
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VIBERATORS
EXTERNAL VIBRATORS INTERNAL VIBRATORS
VIBRATORS
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INTERNAL BIBERATORS
These are portable machines driven by compressed air, petrol or electric motors are most commonly used for compaction of concrete on various "in-situ" construction works
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INTERNAL VIBERATORS
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INTERNAL VIBERATORS
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EXTERNAL VIBERATORS
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MANUAL COMPACTION
THE PURPOSE OF VIBERATION IS TO REMOVE THE AIR VOIDS IN FRESH CONCRETE, THIS CAN ALSO BE DONE MANUALLY.
• THE RATE OF COMPACTION DEPENDS UPON TYPE OF EQUIPMENT USED AND DEPTH OF CONCRETE LAYER.
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LABOR LAYING CONCRETE MASONRY UNITS
LABOUR
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LABOR LAYING CONCRETE MASONRY UNITS
• CONCRETE MASONRY UNITS ARE LAID BY MASONS
• JOINTS ARE MADE BY SPREADING MORTAR ALONG THE INSIDE AND OUTSIDE HORIZONTAL AND VERTICLE EDGES
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LABOR LAYING CONCRETE MASONRY UNITS
• JOINTS MAY BE CUT SMOOTH WITH A STEEL TROWEL, OR THEY MAY BE TOOLED AS FOR BRICKS.
• THE JOINTS ARE MORE RESISTANT TO THE INFILTRATION OF MOISTURE WHEN THEY ARE TOOLED, BECAUSE THE TOOLING INCREASES THE DENSITY OF THE MORTAR.
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LABOR REQUIRED TO BUILD FORMS
LABOR
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LABOR REQUIRED TO BUILD FORMS
THE FACTORS THAT DETERMINE THE AMOUNT OF LABOR REQUIRED TO BUILD FORMS FOR COCRETE STRUCTURES INCLUDE
• SIZE OF THE FORMS
• KIND OF MATERIALS USED
• SHAPE OF THE STRUCTURE
• LOCATION OF THE FORMS
• RIGIDITY OF THE DIMENSIONS REQUIRED
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LABOR LAYING BRICKS
LABOUR
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LABOR LAYING BRICKS
• THE LABOUR HOURS REQUIRED TO LAY BRICKS VARY WITH A NUMBER OF FACTORS, SUCH AS THE
• QUALITY OF WORK
• TYPE OF BRICKS KIND OF MORTAR USED
• SHAPE OF THE WALLS
• KIND OF BOND PATTERN USED
• WEATHER CONDITIONS
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LABOUR EQUIPMENT
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LABOUR EQUIPMENT
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KERB PAVER
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KERB PAVER