Cashflow RequirementsĪ condition assessment of exterior walls of a building is sometimes required even if repairs are not contemplated. Other factors may include serviceability, appearance and cost. The factors that affect the repair objectives include safety and structural integrity, performance and economic service life. If this information is not obtained, there could be a high risk of the repair failing.The extent of the condition assessment depends largely on the aims and objectives of the repair work. Condition Assessmentīefore undertaking repairs to the exterior walls or balconies of a building, a condition assessment to determine existing conditions and the nature and causes of poor performance and visible deterioration, must be conducted. Before you undertake any repairs, you need to consider the following factors. Giving the exterior cladding a face lift when it is needed makes a very old building look young and attractive and hence adds to the value of the building and individual units. Once de-moulded, the exposed surface of the unit can be treated in a variety of ways - acid-etched, smooth or coarse ground, grit or sand-blasted, rubbed or polished.The first impression one gets of a well maintained building is the way its exterior envelope looks. Increasingly, maximum use of off-site fabrication is being made by fixing other elements, from insulation to entire windows, during manufacture of precast panels. Timber moulds can be easily adjusted so that maximum use can be made of each basic mould, further contributing to cost efficiencies.īy inserting mats or rods in the base of the mould different designs and effects can be created - from false joints to intricate leaf patterns. A steel reinforcement cage is placed in the mould prior to the concrete being poured. Precast concrete panels are cast face-downwards in purpose-built moulds, usually made of either timber or fibre glass. The precast panels act as a form, providing the visible aesthetics of the system, while the cast-in-place portion provides the structural component of the system. In some cases, precast panels are used as formwork for cast-in-place concrete.The effectiveness of precast shear walls is largely dependent upon the panel-to-panel connections. Precast concrete shear wall panels are used to provide lateral load resisting system when combined with diaphragm action of the floor construction.Typical load-bearing wall units include solid wall panels, and window wall and spandrel panels. Load-bearing wall units resist and transfer loads from other elements and cannot be removed without affecting the strength or stability of the building.These units can usually be removed individually if necessary. Common cladding units include wall panels, window wall units, spandrels, mullions, and column covers. They are only designed to resist wind, seismic forces generated by their own weight, and forces required to transfer the weight of the panel to the support. These types of precast concrete panels do not transfer vertical loads but simply enclose the space. Precast cladding or curtain walls are the most common use of precast concrete for building envelopes.Highly articulated designs can be accommodated by the mouldable concrete mix, There are generally four types of precast panels used as part of building envelopes: Mixes designed to resemble natural stone can also be produced. Finishes can include acid-etched, smooth or coarse ground, grit or sand-blasted, rubbed or polished. Precast concrete panels are reinforced concrete units available in a wide range of mixes, colours and finishes. Precast Panel Types for Building Envelopes February.26.2016, By Mohammed Zaid, CEng.M.ASCE
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