Use new type of large hardness zero shrinking paddle frame solidified bolt
Several problems to be paid attention to during construction (1) When CGM grouting is manually stirred, add 2/3 of water, stir 2. Then add the remaining water and continue to stir until uniform; (2) Stirring place should be as close as possible Grouting location, and the amount of mixing depends on the amount of use, to ensure that the printing and n will be used up; (3) bolts should be kept clean and rust-free, after the insertion, the horizontal position and top height should be corrected and fixed; (4) It is strictly forbidden to shake and insert the grout during the filling process of the grouting hole. After the grouting is finished, the bolts shall not be adjusted. (5) When the surface is found to have bleeding, the cement-based grouting material should be laid. Drain the water. Effect During the whole construction process, we strictly followed the process, and the various links were adjusted in a reasonable and orderly manner. The grouting and reduction gearbox installation was completed only with h.
It has been identified that the vertical expansion ratio is 0.03%, the compressive strength (the maintenance age is 1 day) is the shaking Ml, a, the steel bar bonding strength is 15MPao or more. The data is obtained under the condition of curing age of 1 day, and the above indicators have been reached. The requirements for the strength of grouting anchor bolts can be tested.
The CGM grouting treatment of the broken bolts saved the curing time for 6 days, and the XY21 Han two drills saved the bolt removal time by 2 days, so that the whole construction process saved 8 days than our estimated time. ZIM270x28 (X) average grinding volume of 29t / h, 8 days can grind coarse powder 29x24x8 = 5568t, fine powder 4454.4t (yield so%), to avoid the loss of sales in the workshop million yuan, at the same time, this The adoption of the method has accumulated experience for dealing with similar problems in the future.
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