Stone acceptance project and standards

Stone acceptance projects and standards, in order to better complete the acceptance work, product processing to meet the required requirements, the inspectors should have relevant professional knowledge. The following talk about the acceptance of the project and standards and some minor misunderstandings.

First, the main control project of stone overall grinding acceptance

1. Inspection of stone: mainly including empty drums, broken, water spots and various pollutions;

2. Detection of protective treatment;

3. The compactness of the joint;

4. Flatness after rough grinding;

5. Gloss and clarity after overall polishing and polishing;

6. Anti-slipness, gloss and clarity after recrystallization hardening treatment;

7. It is strictly forbidden to use the angle grinder (universal grinder) for the trimming of the whole stone. It is not advisable to use the water-grinding sheet for grinding. The ground after the whole grinding of the stone should meet the national standards and design requirements.

Second, the overall grinding acceptance criteria

1. The flatness of the overall grinding of the stone

(1) Overall flatness within the construction range of 2m ± 1mm

(2) The flatness of the height difference (cut) between the two stones is 20cm ± 0mm

2. Gloss of stone grinding and recrystallization hardening

(1) The gloss of the stone after grinding and polishing is not less than 50 degrees. Because the gloss of the whole stone after polishing and polishing directly affects the result of the crystal hardening treatment, we recommend the gloss of the whole grinding of the stone: granite 70 Degree, marble 65 degrees, microcrystalline stone 70 degrees, synthetic stone 65 degrees, terrazzo 65 degrees, ceramic tiles 50 degrees, except for special stone varieties.

(2) Gloss after overall stone grinding and recrystallization hardening treatment: granite above 85 degrees, marble above 80 degrees, microcrystalline stone above 85 degrees, synthetic synthetic stone above 75 degrees, terrazzo more than 75 degrees, ceramic tile 75 Above the degree, except for special stone varieties.

3, the appearance quality of the stone after the overall grinding

(1) At a distance of 0.5m, no obvious scratches or dark scratches may be observed when viewed under the light, back light, front view or side view;

(2) Visually from 1.5m, there shall be no holes, and there shall be cracks in the depression;

(3) Visual inspection at a distance of 0.5 m, there shall be no jagged collapse or wear scars generated when the visible stone is integrally ground;

(4) The transition between the corners and the ungrounded joints shall be smooth, and no obvious pits and intersections shall be left, and the gloss shall meet the requirements of the large surface;

(5) The gloss should be visually observed, which can clearly reflect the reflection of the object, and the reflection of the object is not obviously distorted.

4, inspection method

2m with a straightness tolerance of ±0.2mm

The ruler is placed on the plane to be inspected, and the gap between the ruler and the board surface is measured with a feeler gauge. If the plate surface is convex, the feeler gauge should be measured. The maximum gap value at both ends of the ruler is added and the arithmetic mean value is taken, which is the actual difference of the convex profile. If the plate surface is concave, the value of the maximum gap in the middle should be measured, which is the difference of the actual concave shape.

5, inspection rules

The surface to be tested should be taken 15 cm away from the wall, column or other barrier.

6. In case of special stone varieties or special requirements, the surface of the stone that has not been damaged by the grinding is found before the whole grinding of the stone. After cleaning, the values ​​above ten are added to take the arithmetic mean, the lowest is The arithmetic mean of the gloss is the acceptance criteria after the overall grinding of the stone.

7. The detection of the mirror gloss is carried out in accordance with GB/T13891-92 "Method for Measuring the Girth of Architectural Finishing Materials". The gloss should be the average gloss, the point to be inspected should be at least 10 points, and the arithmetic mean is the gloss reading.

Third, the flatness of the gap after the ground stone is completely polished

1. Use a 20cm ruler and a seam to form a cross. Use a feeler gauge to measure the gap between the ruler and the board surface. The maximum feeler reading indicates the seam leveling difference;

2. The seam to be inspected should be carried out 15cm away from the wall, column or other obstruction;

Stone engineering procurement inspection to three misunderstandings.

1. Misunderstandings caused by small samples

The samples taken from different parts of the same large plate are quite different. If Party A receives the goods according to any one of the samples, it is simply impossible to meet the requirements of the sample.

2. Misunderstandings brought by large plates

Today's stone engineering has a strange phenomenon, that is, the board surface is getting bigger and bigger, the surface stone specification has a plate surface of 1500×1500mm, and the specifications of the wall stone dry hanging actually appear 1500×3000mm. Once the stone manufacturer raises an objection, Party A often asks: "Others can do it, why can't you do it?" The manufacturer immediately dumb. ”

3. Misunderstandings caused by small defects

Once Party A raises the issue of small defects on the board, it is difficult to answer.