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General construction of composite hollow bolt grouting technology and points

Source: Time:2017-03-27 16:45:16 frequency:

Construction methods and points of composite hollow bolt :

1, the composite hollow bolt, after the initial shotcrete construction measure according to the design requirements set before drilling the hole, make a mark, adopt YT28 blower gun drill hole drilling, according to the calibration hole is apart from the margin of error is plus or minus 150 mm, 40 mm diameter or greater, a depth of 610 cm or more.

2, anchor must approach used after inspection, without inspection or not qualified anchor is strictly prohibited.

3, anchor to straight before use, cleaning, degreasing, insert length shall not be less than 95% of the length of the design, which shall not be less than 570 cm. Bolt after installation shall not be arbitrarily knock.

4, anchor in strict accordance with the standard installation work design, plate and close to the spray layer.

5, grouting mortar by the hollow anchor rod body inside the hollow hole from the connection on the pulp out of the mouth into the anchor hole wall with steel rod body, the gap of anchor hole filled with mortar from bottom to top, from the exhaust pipes of air inside the anchor hole until back to slurry, grouting plug immediately after the completion of installation, in case of slurry backflow pipe outside.

6, composite hollow bolt grouting material appropriate USES mastic than appropriate is 1:1 ~ 1 to 1. 2 (weight ratio) of cement mortar, water cement ratio is 0.4 ~ 0.5. Using cement mortar sand particle size should not be greater than 2.5 mm.

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