insttalation of buried pipeline

8/8/2019 Insttalation of Buried Pipeline

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PRESENTED BY

PRASAD.P.BHOSALE

TODEPT.OF PIPING DESIGN AND ENGINEERING

MIT COLLEGE OF ENGG. AND TECH.

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1) SOIL1) TRENCHING

2) BEDDING3) HAUNCHING4) BACKFILL5) COMPACTING TECHNIQUES

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SOIL PLAY MOST IMPORTANT ROLE ININSATTALATION OF BURIED PIPELINE.ASTM D 2487 DEFINES SOIL CLASSESCLASSIFICATION IS DONE ON THE BASISOF FOLLOWING PROPERTIES

1) Percentages of gravel, sand, and fines

2) Shape of grain-size distribution curve3) Plasticity and compressibility

characteristics.

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FOR MAXIMUM PIPE STRENGTH, THEWIDTH OF TRENCH SHULD BERESTRICATED TO WHAT IS ESSENTIAL TOSAFETY POSITIONTRENCH WIDTH OF RIGID PIPE ANDFLEXIBLE PIPE IS NOT SAME.

FOR RIGID PIPE, NO SPECIALREQUIREMENT FOR TRENCH WIDHNEEDED,BUT FOR FLEXIBLE PIPE, ITNEEDED

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BASE OF THE TRENCHPREPARATION ONLY REQUIRED WHENTHE TRENCH BOTTOM IS UNSTABLE

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1) TO BRING THE TRENCH BOTTOM UP TO THE GRADE2) TO PROVIDE UNIFORM LOGITUDINAL SUPPORT OF

THE PIPE.3) AVOID BLOCKING TO BRING THE PIPE TO GRADE4) PROVIDE SPECIFIED DENSITY AROUND PIPE5) ASTM 2321 PROVIDES A CLASSIFICATION CHART FOR

DETERMINED THE TYPE OF BEDDIND FOR VARYING

CONDITION.

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1) IT COVER THE SPACE BETWEEN TOP OF BEDDING TOSPRINGLINE OF PIPE

2) TO OPTIMIZE PIPE STRENGTH BY PROVIDING ENOUGH

SIDE SUPPORT TO PIPE3) IT PROTECT PIPING MATERIAL,COATING ANDENCASEMENT FROM DAMAGED

4) HELP TO ENCOMPASSES THE BEDDING ZONE

5) COMPACT HAUNCHING AS REQUIED TO ACHIEVEDDENSITY SPECIFIED FOR BACKFILL MATERIAL

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IT SHOULD BE BROUGHT TO THE SPECIFIEDDENSITY AROUND THE PIPE

BACKFILL MATERIAL SHOULD BE FREE OFLUMPS,CLODS,BOULDERS AND DERBIS .

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Depth of coverDepth of waterPipe materialCompaction method available

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BACKFILL

INTIALBACKFILL

FINALBACKFILL

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THE MATERIAL USED IN FILLING ATRENCH,FROM BEDDING TO FINISHEDSURFACE

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MECHANICAL COMPACTIONVIBRATIONFLOODING JETTINGFLUSHINGHIGH VELOCITY IMPACTSLURRY AND FLOWABLE FILL

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densify the soil by rolling, kneading, pressing,impacting, vibrating, or any combination.. Heavy equipment (compactors, loaders,scrapers, etc. ) must not operate close to thestructuremisalignment, deflection, and high inducedstress may occur.

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Loose soil can be compacted by vibrating itwith vibro plates and vibrating rollersSome compaction of the embedment can beachieved by vibrating the pipe itself

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Soil density greater than critical can beachieved by jetting.This technique is particularly attractive for soilcompaction around large buried structures.

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1) compaction can be achieved by droppingfrom a sufficient height, blowing, slinging, etc

2) Better control is achieved if dry soil is blownor slung into place

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THANK YOU