Mechanical Vibration Clause Samples
The Mechanical Vibration clause sets standards and requirements for acceptable levels of vibration produced by machinery or equipment during operation. It typically outlines measurement methods, permissible vibration thresholds, and responsibilities for monitoring and addressing excessive vibration. For example, it may require regular testing of installed equipment to ensure compliance with specified vibration limits, and mandate corrective actions if those limits are exceeded. The core function of this clause is to protect equipment integrity, ensure safety, and minimize disruption or damage caused by excessive mechanical vibrations.
Mechanical Vibration. Concrete during and immediately after depositing shall be thoroughly compacted; unless otherwise provided, the compaction shall be done by mechanical vibration to the following requirements:- The concrete shall be compacted by means of a mechanical vibrator operated within the mass of concrete. when required by the Superintending Engineer vibration shall be supplemented by hand spading. The concrete shall be spaded by hand in all covers and angles of the forms, and along from faces while it is being vibrated. The concrete shall be vibrated with a frequency of not less than 3,500 impulses per minute. The vibration shall be of sufficient intensity and duration to cause flow or settlement in to place and complete compaction. Over vibration shall be avoided. The mechanical vibrator shall be: of a type and design approved by the Superintending Engineer. It shall be adequately powered and capable of transmitting vibration of the required frequency to the concrete. A sufficient number of mechanical vibrators shall be provided on the job so that each batch may be thoroughly compacted immediately after placing and that there will be no delay in placing and compacting ensuring batches. The vibrator shall be applied to the concrete, immediately after depositing and so manipulated that the concrete is reduced to a uniform plastic mass thoroughly compacted. It shall be thoroughly compacted around the reinforcement and worked into the corners and angles of the forms. The forms of the reinforcement shall not be vibrated. Concrete shall be placed in layers of uniform thickness not exceeding 300mm (12") and the apparatus so operatea tna the vibrating element aoes not penetrate through the layer of the fresh concrete and disturb the partially hardened concrete in lower layers. Vibrators shall not be pushed into or withdrawn from the mass of concrete too rapidly. The water content of the concrete shall be the minimum necessary to produce uniformly dense concrete free from aggregate pockets or honeycombing 10-16-12 Surface Finish: Immediately following the removal of forms all cavities produced by the removal of form ties and all other hooks and depressions honey-comb spots, broken edges of corners and other defect, shall be thoroughly cleaned, saturated with water and carefully pointed and rendered smoothly with mortar of cement and fine aggregate mixed in the proportions used in the ▇▇▇▇▇ of concrete that is being finished and of as dry a consistency as is possible to use, ...
Mechanical Vibration. All concrete for exposed concrete work shall be vibrated, using needle vibrators -30/32 mm. Surface or trough vibrators may be permitted to be used for thin slabs. External vibrators for walls may be allowed but this shall be done carefully to safeguard the displacement of the shuttering. Vibrators shall only be operated by skilled labour; over or under vibration shall not be permitted. Any spillage, or leakage, which is unavoidable and which flows down the exposed concrete surfaces, shall be immediately washed away with clean water and brush. Exposed concrete members shall be finished to desired surface while the concrete is still green.