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45 R E L A S T ® D E S I G N M A N U A L C1 Drill hole cleaning Compressed Air Cleaning CAC Cleaning for dry and wet drill holes with all diameter in noncracked and cracked concrete Standard hole drilling Stepped hole drilling 2a Starting from the bottom or back of the drill hole blow the hole clean using a hand pump 2b Check brush diameter Brush the hole with an appropriate sized wire brush > d b min a minimum of four times If the drill hole ground is not reached with the brush a brush extension shall be used Cleaning with a brush attached to a drilling machine or battery screwdriver is also possible 2c Finally blow the hole clean again with a hand pump After cleaning the drill hole shall be free of dust and oil The drill hole has to be protected against recontamination in an appropriate way until dispensing the mortar in the drill hole If necessary the cleaning has to be repeated directly before dispensing the mortar Inflowing water must no contaminate the drill hole again C2 Drill hole cleaning* Cleaning for dry wet and waterfilled drill holes for all diameters in noncracked concrete Standard hole drilling Stepped hole drilling 2a Rinse with water until clear water comes out 2b Check the brush diameter Brush the hole with an appropriate sized wire brush > d b min a minimum of two times in a twisting motion If the drill hole ground is not reached with the brush a brush extension must be used For stepped hole drilling it is also recommended to brush the bigger diameter hole with an appropriate sized wire brush a minimum of two times in a twisting motion 2c Rinsing again with water until clear water comes out Standard hole drilling Stepped hole drilling 2d Starting from the bottom or back of the drill hole blow the hole clean with compressed air min 6 bar a minimum of two times until return air stream is free of noticeable dust If the drill hole ground is not reached an extension shall be used 2e Check brush diameter Brush the hole with an appropriate sized wire brush > d b min a minimum of two times If the drill hole ground is not reached with the brush a brush extension shall be used Cleaning with a brush attached to a drilling machine or battery screwdriver is also possible For stepped hole drilling it is also recommended to brush the bigger diameter hole with an appropriate sized wire brush a minimum of two times in a twisting motion 2f Finally blow the hole clean again with compressed air min 6 bar a minimum of two times until return air stream is free of noticeable dust If the drill hole ground is not reached an extension shall be used After cleaning the drill hole shall be free of dust and oil The drill hole has to be protected against recontamination in an appropriate way until dispensing the mortar in the drill hole If necessary the cleaning has to be repeated directly before dispensing the mortar Inflowing water must not contaminate the drill hole again *The following drill hole cleaning procedure for diamond drilling is only to be taken as a recommendation This procedure is not covered by the technical approvals