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Summary of Contents for SISCO Brick Rebound Hammer
- Page 1 User Manual Brick Rebound Hammer Please read this manual carefully before using the product and keep it in a safe place.
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Page 2: Please Read First
Please read first Thank you for choosing SISCO company's products, we will be happy to provide you with high quality products and fast service. Before using our products, please be sure to read the contents of this manual carefully. 1. The manual in the process of compiling the contents... - Page 3 Catalogs 1. Overview..................1 2. Rebound meter construction..............2 The operation, maintenance and calibration of the rebound meter..3 4. Testing Techniques................6 Strength presumptions..............9 Appendix I. Conversion values of brick compressive strength in the measurement area................12...
- Page 4 1. Overview Brick rebound meter is a spring-driven impact hammer and through the impact rod impact sintered ordinary brick masonry or sintered porous brick masonry brick surface generated by the instantaneous elastic deformation of the restoring force, so that the impact hammer driven pointer rebound and indicate the rebound distance, the rebound value as a common brick masonry sintered brick masonry or sintered porous brick masonry brick compressive strength related to one of the...
- Page 5 2. Rebound meter structure Figure 1 illustrates the longitudinal cross-section of the brick rebound meter after impact. 1 - Fastening Nut 2 - Zeroing Screw 3 - Hook 4- Hook pin 5 - Button 6 - Housing 7 - Ejector Hammer 8 - Spring Seat 9 - Clamp Ring 10 - Sealing Felt Ring...
- Page 6 3. Operation, maintenance and calibration of rebound instrument Ⅰ Operation (1) Hold the striking rod against the surface of the brick sample, press the instrument gently to release the button, release the pressure to extend the striking rod, and hook up the striking hammer.
- Page 7 Ⅱ Maintenance The rebound instrument should be routinely maintained under any of the following circumstances: (1) Hit more than 2000 times; (2) When there is doubt about the detection value; (3) Steel anvil rate is not qualified; Conventional maintenance methods should meet the following requirements: (1) Unscrew the front cover and the tail cover, take off the ring and the pressure spring, make the hammer decoupling and take out the...
- Page 8 Ⅲ Verification Under any of the following circumstances, the rebound instrument shall be sent to the verification unit recognized by the competent authority for verification, and the qualified rebound instrument shall have a verification certificate; (1) Before the new rebound instrument is used; (2) Exceed the validity period of verification (validity period is half a year);...
- Page 9 4. Testing techniques ⅠGeneral provisions Sintered brick rebound method is applicable to presume the compressive strength of bricks in sintered ordinary brick masonry or sintered porous brick masonry, and is also applicable to detect the strength of lightweight aggregate concrete and other lightweight materials. It is not suitable for presuming the compressive strength of bricks in sintered common brick masonry or sintered porous brick masonry whose surfaces have been weathered or subjected to frost...
- Page 10 (2) In each brick on the measurement surface should be uniformly arranged 5 popping points. Selection of the bullet point should avoid defects on the surface of the brick. The distance between two adjacent points should not be less than 20mm, the impact point from the edge of the brick should not be less than 20mm, each point should only be bounced once, the rebound value readings should be estimated to 1.
- Page 11 R - the average rebound value of the jth measurement site in the ith measurement area. (3) The average compressive strength of bricks in the test area should be calculated according to the following formula: (4) The reference basis of this manual is the national standard "Technical Standard for On-site Inspection of Masonry Engineering"...
- Page 12 5. Strength presumption 1. The discordations and statistical outliers in the test data should be detected and eliminated according to the relevant Grubbs test method or Dixon test method in GB/T4884 of the current national standard "Statistical Processing of Data and Interpretation of Normal Sample Outliers Judgment and Treatment".
- Page 13 In the formula： Average strength of the same test unit (MPa). The number of test areas of the same test unit; The strength representative value of the measured area (MPa). The strength standard deviation (MPa) calculated according to n2 test areas of the same detection unit; Coefficient of strength variation of the same detection unit (4) Existing masonry works, each test unit of brick...
- Page 14 In the formula： a standard value of brick compressive strength of the same test unit (MPa). 2, when the coefficient of variation δ> 0.21, should be in accordance with Table 5.4-1, Table 5.4-2 in the compressive strength of the average value of the minimum value of the compressive strength of the unit of measurement presumed...
- Page 15 Appendix I Conversion value of compressive strength of brick in test area Average rebound Average rebound Common brick Common brick Perforated brick Perforated brick value value...
- Page 16 Average rebound Average rebound Common brick Common brick Perforated brick Perforated brick value value...
- Page 17 Average rebound Average rebound Common brick Common brick Perforated brick Perforated brick value value...
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