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Lecture 3- Planning Earthwork Construction

Lecture 3- Planning Earthwork Construction - CEM 602...

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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s CEM 602 Construction Methods Lecture 3 Earthwork Construction
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Earthwork Construction L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 2
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Planning for Earthwork The planning for earthwork is usually filled with uncertainties that need to be decreased The main uncertainty is in the quantities of soil excavated The quantity take-off not only needs to determine total quantity of earthmoving but types of earth moved “Mass excavation” involves moving substantial volumes of earth (primary part of the project) L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 3
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Planning for Earthwork “Structural Excavation” is excavation work is support of the construction of other structural elements Work is performed in a confined area and is usually vertical Volumes is not a large factor, but complexity of moving earth in a confined area Other risk in earthwork are concerned with the types of earth actual encountered Differing site conditions (DSC) are grounds for claims L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 4
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Planning Earthwork Most contracts have DSC Clauses There are two types of DSC Type 1: when actual conditions differ materially from those “indicated in the contract” Type 2: when actual conditions differ from reasonable expectations The presence of DSC clauses do not remove the responsibility of the contractor Contractors have to perform field investigations L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 5
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Graphical Presentation of Earthwork Horizontal distances in project (usually highways) is denoted by stations Station refers to a distance of 100ft, while the number after the plus sign refer to number of feet after the station Three kinds of views are used in contract documents: Plan view: Looking down on the project Profile view: Cut view along the centerline Cross section: Plan cutting work vertically L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 6
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Graphical Presentation of Earthwork Plan view L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 7
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Graphical Presentation of Earthwork Profile view L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 8
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Graphical Presentation of Earthwork Cross section view L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 9
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C E M 6 0 2 C o n s t r u c t i o n M e t h o d s Graphical Presentation of Earthwork Cross section view is used to determine the quantities of materials Adjustments should be made for thickness of pavement structure L e c t u r e 3 - E a r t h w o r k C o n s t r u c t i o n 10
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