construction of bored piling works in karst terrain are becoming more and more common, performing concealed works in karst terrain comes with
Method statement of Hydro Test
Full description
Full description
DINDINGS CONSTRUCTION SDN BHD METHOD OF STATEMENT FOR RECTIFICATION OF HONEYCOMBS 1.0
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OBJEVTIVE 1.1 To outline the method statement for rectification of Loose Concrete and honeycombs. SCOPE 2.1 This method of statement applies to all activities associated with grouting works at site of our scope. PURPOSE 3.1 This method of statement describes the procedure and inspection instructions to be followed during application of Grouting works. This has to ensure that all activities are in full compliance with requirements as per manufacturer’s standards.
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SOURCES 4.1 SikaGrout-215 (Product Data Sheet)
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WORK SEQUENCE 5.1 Identify the loose concrete and honeycombs defective area 5.2 The affected defective area is cleaned, brushed, hammered or chiselled to remove the loose concrete and small particle such as sands and dusts. 5.3 Hack off all the loose concrete until sound and solid concrete is achieved. 5.4 All the leftover concrete dust is then washed away with water or blown using compressed air. This is to ensure good bonding between the concrete and the repair material. 5.5 Ensure that the surface is clean and free from oil, grease or any loose material. 5.6 Non-shrink grout SikaGrout 215 is then mixed according to the supplier’s instructions: i. Pre-dose the required volume of clean water into a clean mixing vessel. For a flowable mix, use 3.60l – 4.00l of water per 25kg bag. Add the powder slowly into the pre-measured clean water and mix mechanically for at least 3 minutes with a slow speed mixer or until a smooth, uniform consistency is achieved. ii. Place about 70% - 80% of the premeasured clean water (depending on consistency required - refer to mix ratio) into a clean container and gradually add the whole bag of SikaGrout – 215 into it while continuously mixing. Add the remaining water until the desired consistency is obtained. iii. Mix for 2 to 3 minutes with a slow speed drill (500 rpm max). 5.7 5.8 5.9
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Using a masonry trowel, a layer of the non-shrink grout is then applied onto the surface of the affected area. Level the surface to the required shape and finishing. The affected area shall be brushed / trowel smoothly. The repaired area will be hardened after about 4 to 5 hours.
MACHINERY, EQUIPMENT, TOOLS AND MATERIAL 6.1 Brush 6.2 Non-Shrink Grout (SikaGrout-215) 6.3 Hammer 6.4 Chisel 6.5 Electrical Breaker
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6.6 Plain Water 6.7 Trowel LABOUR INVOLVED 7.1 Supervisor 7.2 Worker
: 1 person (according to the respective PIC) : 5 workers (3 – hacking, 2 – Patching)
SAFETY 8.1 All relevant personnel shall be made familiar to this method of statement. 8.2 All related personnel must be wearing necessary PPEs. 8.3 All necessary precautions must be taken for working with high places and necessary scaffoldings. 8.4 Material contains cement, which may produce an allergic effect. Keep out of reach of children.
