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    Building Technology 5 (Waffle Slab or Grid Slab) Presentation

    Uploaded by

    Jonica Mae Jomadiao
    This document discusses grid slab or waffle slab construction. It describes the characteristics of a two-way concrete slab reinforced in two directions, creating a waffle-like pattern on the underside. The process of constructing a waffle slab involves preparing the building site, installing utilities and formwork, laying out void-creating waffle boxes, installing reinforcement steel, and pouring the concrete. Waffle slabs are used for large spans in buildings like libraries, communication centers, and parking garages due to advantages like lightweight construction and stability.

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    Download as PPTX, PDF, TXT or read online from Scribd

    Building Technology 5 (Waffle Slab or Grid Slab) Presentation

    Uploaded by

    Jonica Mae Jomadiao
    241 views20 pages
    This document discusses grid slab or waffle slab construction. It describes the characteristics of a two-way concrete slab reinforced in two directions, creating a waffle-like pattern on the underside. The process of constructing a waffle slab involves preparing the building site, installing utilities and formwork, laying out void-creating waffle boxes, installing reinforcement steel, and pouring the concrete. Waffle slabs are used for large spans in buildings like libraries, communication centers, and parking garages due to advantages like lightweight construction and stability.

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    Original Title

    BUILDING TECHNOLOGY 5 (WAFFLE SLAB OR GRID SLAB) PRESENTATION

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    This document discusses grid slab or waffle slab construction. It describes the characteristics of a two-way concrete slab reinforced in two directions, creating a waffle-like pattern on the underside. The process of constructing a waffle slab involves preparing the building site, installing utilities and formwork, laying out void-creating waffle boxes, installing reinforcement steel, and pouring the concrete. Waffle slabs are used for large spans in buildings like libraries, communication centers, and parking garages due to advantages like lightweight construction and stability.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    241 views20 pages

    Building Technology 5 (Waffle Slab or Grid Slab) Presentation

    Uploaded by

    Jonica Mae Jomadiao
    This document discusses grid slab or waffle slab construction. It describes the characteristics of a two-way concrete slab reinforced in two directions, creating a waffle-like pattern on the underside. The process of constructing a waffle slab involves preparing the building site, installing utilities and formwork, laying out void-creating waffle boxes, installing reinforcement steel, and pouring the concrete. Waffle slabs are used for large spans in buildings like libraries, communication centers, and parking garages due to advantages like lightweight construction and stability.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 20

    BUILDING TECHNOLOGY 5: ALTERNATIVE

    BUILDING CONSTRUCTION SYSTEMS

    GRID SLAB OR WAFFLE SLAB

    GROUP NO.9

    CAMUA, PATRICK KENT B.


    DELA CRUZ, AARON ROBERT S.
    FULGENCIO, BIANCA MAE F.
    JOMADIAO, JONICA MAE D.
    YŇIGUEZ, MARCOS FRANCISCO R.
    GRID SLAB OR WAFFLE SLAB
    - A two-way concrete slab reinforced by ribs in two
    direction

    CHARACTERISTICS
    - has two directional
    reinforcement
    Fig. 1 two directional reinforcement

    - the top portion is generally


    smooth but the underside has a shape
    like a WAFFLE

    Fig. 2 underside portion of the slab


    FEATURES
    - Slab Thickness: 85-100 mm
    - Internal Beams: 100-200 mm wide
    - use of cardboard slab panel/void formers
    (waffle pods)
    - slab panels are on 1m grid (approximately)
    - used on flat sites and wholly above ground

    Fig. 3 waffle pods Fig. 4 sample dimension of waffle slab


    Plastic “domes”

    Fig. 14 Plastic Domes

    Steel“domes”
    Fig. 15 Steel Domes
    Fig. 5 Flat grid or waffle slab reinforced concrete floor.
    GRID SLAB OR WAFFLE
    SLAB
    PROCESS
    1. Prepare the building path. It has to be a clean and
    leveled building surface.

    2. Install underground utilities, and place the perimeter


    formwork.

    3. Then layout the waffle boxes. This boxes create


    voids in the foundation, also it has to be laid out
    correctly.
    CEILING

    Fig. 6 view of floor slab with reinforcement

    FLOOR

    Fig. 7 view of ceiling slab


    4. Install the reinforcement steel for maximum
    slab strength.

    5. If everything is in place and inspected, pour


    over the concrete.
    FLOOR
    (SECTION)
    Fig. 8 floor slab section view

    CEILING
    Fig. 9 view of the ceiling
    GRID SLAB OR WAFFLE
    SLAB
    APPLICATION
    APPLICATION OF FLAT
    GRID/WAFFLE SLAB
    • It can be used as both ceiling and floor slab,
    usually in areas having huge spans
    • It is usually used for specialized projects
    involving clean rooms
    • It is used in projects such as centers, airports,
    parking garages commercial and industrial
    buildings requiring extra stability
    EXAMPLES OF GRID/ WAFFLE SLAB BUILDINGS

    • YALE UNIVERSITY LIBRARY-NEW HAVEN,CONNECTICUT

    Fig. 10 Yale University Library-New Haven in Connecticut


    EXAMPLES OF GRID/ WAFFLE SLAB BUILDINGS

    • METROPOL PARASOL-SEVILLE, SPAIN

    Fig. 11 Metropolitan Parasol-Seville in Spain


    EXAMPLES OF GRID/ WAFFLE SLAB BUILDINGS

    • LODYTEL COMMUNICATION DEVELOPMENT CENTER-


    MADRID, SPAIN

    Fig. 12 Lodytel Communication Development Center in Madrid, Spain


    GRID SLAB OR WAFFLE
    SLAB
    ADVANTAGES
     LIGHTWEIGHT
     HOLD LONGER SPAN
     MORE STABLE THAN TRADITONAL SLAB
     CAN SAVE 15%CONCRETE & 10% STEEL
     GOOD RESISTANCE TO VIBRATION
     CRACK ANG SAGGING RESISTANT
    Fig. 13 Difference of Waffle slab in other types of slab.
    GRID SLAB OR WAFFLE
    SLAB
    DISADVANTAGES
     Construction requires strict supervision and skilled labor.
     The casting forms or molds required for pre-cast units are very
    costly.
     Headroom is reduced , hence greater storey height.
     Creates problem in lighting facilities and hanging pipes or ducts.
     Difficult to prefabricate reinforcement.
     Curved partitions are hard to build.
     Low fire rating.
    Fig. 16 Stripping plastic dome after removal of
    temporary plywood deck

    Fig. 17 Plastic dome formwork being


    assembled.
    References
    • http://www.slideshare.net/agawade34/flat-grid-waffle-slab
    • https://prezi.com/rbzrg3h3-zlq/waffle-slab/
    • http://civildigital.com/ribbed-waffle-slab-system-advantages-disadvantages/
    • http://documents.tips/documents/waffle-slab-pptpptx.html
    • http://www.ulmaconstruction.com/en/formwork/slab-formwork/waffle-formwork-
    for-grid-slabs-recub
    • https://deniseweber.files.wordpress.com/2012/08/img_21262.jpg
    • https://www.yatzer.com/sites/default/files/styles/featured/public/article_images/
    2577/thumb.jpg?itok=PhQA0ujf
    • http://media.virbcdn.com/cdn_images/resize_1280x2400/c4/e72f7e8f3069be64-
    05.jpg

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