Measurement & Quantification (Part 2), Lecture notes of Engineering Mathematics

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MODULE 1: MEASURING

QUANTITIES AND

ITEM OF WORKS IN

BUILDING

IN SITU

CONCRETE

WORKS

REINFORCEMENT

REINFORCEMENT

RULE OF MEASUREMENT  Measure separately for different types of steel bars  Measure separately for different size/diameter  Forming hooks, tying wire, spacers, cutting/splicing and bending are deemed included.  Chairs and connectors are deemed included unless not at discretion of contractor

REINFORCEMENT

CONCRETE COVER PROVISION  Concrete cover is the distance from the outer face of an element to the outer girth of reinforcement and is provided to ensure that there is adequate protection to steel reinforcements that are not exposed from the concrete and thus prevent rusting.

REINFORCEMENT

ANCHORAGE & LAP SPLICE LENGTH  Lap length is the length of bar overlap when bars are tied together for extending the reinforcement length.  Anchorage Length is the additional length of steel required to be inserted from one structural member into another structural member at the junction.

SAMPLE LAP SPLICE & ANCHORAGE TABLE

PROCEDURES FOR MEASURING REINFORCEMENT  Make sure to read the specifications or general notes and checked all notes on plans you will be using and all other relevant documents.  Study carefully the drawings and details given. Make sure that you understand clearly the details given.  Check if there is enough information given to be able to measure lengths. Be sure to check specifications and general notes.

PROCEDURES FOR MEASURING REINFORCEMENT  (^) Tick off or loop through bar marks measured to check if all reinforcement for the particular element has already been taken or measured.  If there are any uncertainties in the details, make a query on this.  Check for any assumptions made to be put in measurement notes.

MEASUREMENT OF BEAM REINFORCEMENT  (^) Typically, reinforcement to ordinary beams will comprise of top bar reinforcement, bottom bar reinforcement, links or stirrups and side bars.  (^) End conditions for beams are usually given with anchorage length, either given lengths in tabulated form or given as multiples of bar diameter.  Pay particular attention where anchorage length is measured from, which is usually from the inner face of support or from the centerline of support.

SAMPLE GIRDER/BEAM DETAIL