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    Ribbed Formwork

    Introduction


    RIB21 – an expanded metal sheet product used in permanent formwork for concrete. The precision engineered open mesh profile enables the development of dense concrete indentations on the face of the ribs, creating a superior key for the second phase pour.

     

    Primarily used in construction joint applications and stop ends RIB21 can also be used to form wall, beam and column surfaces and slab soffits.

     

    Benefits

    • Offers increased productivity.

    • Outperforms traditional prepared joints in shear and bond when formed correctly.

    • Reduces the concrete pore/water pressures apparent with materials such as timber and steel, resulting in a reduction of supports required.

    • Eliminates preparation of the joint surface, thus allowing reinforced fixing to continue without a break.

    • Allows concrete pours to be visually monitored, reducing the risk of voids or honeycombing within the concrete.

    • Allows a high rate of rise of pour to be achieved.

    • Offers versatility and can be used with ribs running horizontally or vertically, curved and in water retaining structures.

    • Permanently installed, unlike temporary timber formwork that must be removed after concrete is cast.

     

    Formwork Applications

    • Construction joint stopends

    • Vertical construction joint stopends

    • Deep construction joints

    • Permanent wall and column formwork

    • Permanent soffit formwork

    • Industrial floor slabs

    • Water retaining & excluding structures

    • Curved, inclined and top formwork

     

    • Sprayed concrete background


    Standard joint with timber support

     

    High Rib Mesh

     

    Standard joint with centre water stop

     

     

    Permanent soffit formwork

     

    When more than one sheet is used,the ends should project at least 75mm past intermediate supports. At end supports, such as the blockwork wall shown on left, there should be at least 50mm of bearing.

     

    High Rib Mesh

     

    *supporting falsework and steel reinforcement are the responsibility of the Temporary Works/Structural Engineer.

     

    Installation Details

     

     

    The table below indicates the safe clear distance between the centres of vertical supports for RIB21 used in construction joints up to 3m in depth. The horizontal clear distance between the supports depends on the depth of the joint and the selected method of support to the RIB21.

     

    The table below indicates the safe clear distance between the centres of vertical supports for RIB21 used in construction joints up to 3m in depth. The horizontal clear distance between the supports depends on the depth of the joint and the selected method of support to the RIB21.

     

     

    The RIB21 sheets are used with the ribs horizontally pointing into the concrete, and spanning perpendicular to the vertical supports.

     

    The theoretical pressure is calculated using Table 2 in CIRIA Report 108 with a concrete density of 25 kn/m3, for a base/column/wall; and applied to concrete Groups 1 to 5.

     

    The clear distance between supports is measured as the actual centres when using steel reinforcement or the clear inside dimension when using timber supports.

     

    The acceptable clear distances calculated for a rectangular pressure diagram has been increased by a factor of 1.2 to allow for the triangular shape of the concrete pressure diagram applied to the joint face.

     

    The calculations assume that the full weight density head of concrete applies. It is unlikely that the maximum design

    pressure will be reached for joints greater than 1500mm.

     

    Support Systems

     

    RIB21 can be used with all traditional support systems such as timber, rebar, scaffold poles, proprietary wailings and soldiers.

     

    RIB21

    • Fastens by wire tying to steel/rebar or by nailing to timber supports.

    • Fixed with the ribs running horizontally or vertically and supported at right angles.

    • Ensure 21mm ribs point into the area being prepared for the concrete pour.

    • Apply the same concrete cover as the rebar.

    • Achieve cover zones by using timber strip at top and bottom edges.

    • Fix between the top and bottom mats of reinforcement.

    • Join adjacent sheets by nesting outer ribs and wire tying.

    • Support and overlap end on end sheets by a minimum of 50mm.

    • Fix overlapping sheets of RIB21 by wire tying sheets tightly together in order to reduce the gap between the sheets.

     

    Concrete details

    • RIB21 can be used with most grades of concrete.

    • Pour concrete 500mm away from RIB21.

    • Vibrating pokers should be used 450mm away from RIB21 and operated until concrete begins to bleed through mesh profile.

    • Monitor pour carefully and operate bursts of 5-10 seconds in instances where poker is closer than 450mm.

    • Remove excess grout, taking care not to disturb the concrete RIB21 face.

     

    Technical Data

     

    Material

     

     

    RIB21 formwork is manufactured from hot dipped zinc coated steel DX51D+Z275 to BS EN 10327 : 2004.

     

     

    Dimensions

     

    RIB21 formwork is available in three thickness grades and in lengths of 2000mm, 2500mm, 3000mm. Other lengths available on request.

     

    High Rib Mesh

     

    High Rib Mesh

    High Rib Mesh

    High Rib Mesh

     

    Productive process

     

    High Rib Mesh

     

    Pictures

     

    High Rib Mesh

     

    High Rib Mesh

     

    High Rib Mesh

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