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Unformatted text preview: C E M 6 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 C E M 6 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 C E M 6 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 takeoff 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 C E M 6 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 C E M 6 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 C E M 6 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 C E M 6 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 C E M 6 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 C E M 6 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 C E M 6 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 C...
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This note was uploaded on 03/17/2012 for the course CEM 602 taught by Professor Amrkandile during the Spring '10 term at American University in Cairo.
 Spring '10
 AmrKandile

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