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| Bolt operation process flow |
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UpdateTime：[2012/1/4 9:42:05] Hits：[3436] From：TONRY MINING SAFETY SUPPORT TECHNOLOGY CO.,LTD
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The 1 hole
( 1) before drilling, according to the design requirements and the condition of soil layer, a hole, make a mark on.
( 2) operations in the face of venue to be flat, solid, drainage, field width greater than 4m.
( 3) the rig in place, should remain stable, the guide rod or shaft and the drill rod angle, and on the same axis.
( 4) drilling drilling for the geological department, using the common core drilling bit and pipe series. Drilling equipment according to the condition of soil layer anchor drilling machine or choose special geological drilling rig.
( 5) according to the soil condition choice of core drilling, also can choose to cooperate with non core drilling; drilling with casing, should be equipped with a sufficient number of length 0.5-1.0m short sleeve.
( 6) in the drilling process, should be careful operation, mental concentration, a reasonable grasp of drilling parameters, a reasonable grasp of the drilling speed, to prevent the drill, drill and other inner hole accident. Once the occurrence of accident in hole, should strive for all the time as soon as possible, and prepare all necessary accidents salvage tool.
( 7) drilling is finished, the water hole bottom sediment rinse until water returns, orifice.
2 anchor rod body assembly and placement
(1 ) according to the design and production of anchor, to make the anchor in the drilling center, should be in the anchor rod on the set of frame or the isolation rack ( crude steel rod along the axial direction at intervals of 1.0-2.0m set a fixed rack, strand or wire bundle every 1.0-1.5m set an isolation frame )
( 2) anchor bar or wire flat, straight, oil removing embroidery. Rod free section of plastic cloth or plastic pipe,. And the anchor connected by wire lashing.
( 3) placed the anchor rod body, should prevent the rod body twisting, bending, preferably with anchor grouting pipe together into a hole, tube end from the bottom hole as 50-100mm, the rod body in angle and inclination of borehole to maintain consistent, right after that the rod body is always in the center of the borehole.
( 4 ) if the hole wall collapse, should be through hole, hole cleaning, until able to smoothly into the anchor rod.
3 grouting
( 1) the grouting materials shall be determined according to design requirements, general appropriate selection of cement: sand = 1: 1-1: 2, water to cement ratio 0.38-0.45 cement mortar or cement water ratio 0.40-0.45 water slurry, if necessary, by adding a certain amount of additive and admixture.
( 2) slurry stirring uniform, sieving, mixing with slurry with, should be used up before the initial setting, grouting pipe shall be kept smooth.
( 3) the pressure grouting mortar pump the slurry through the grouting tube to the bottom of the hole, the hole bottom return orifice, orifice size or to overflow exhaust pipe to stop the exhaust, can stop grouting.
( 4) slurry hardening after full anchor solid, should fill slurry, grouting quantity shall not be less than the amount of calculation, the filling coefficient of 1.1-1.3.
( 5) when grouting, appropriate boundary perfusion side pull out pipe grouting. But attention should be paid to nozzle should be maintained in plasma surface, Grouting grouting pipe shall from time to time activities, to be slurry overflow hole mouth all pull out,
( 6) out of the casing, extubation should be paid attention to when reinforced with or without being taken out of the case, or should be pressed into straight to not bring up so far, continue to extubation.
( 7) the grouting should be completed and the exposed steel clean, and protect the.
4 tensioning and locking
( 1) according to the design and process requirements of installation of middle beam, and to ensure that each flat, beam and wall voids between the important attached compacting, and installed the supporting platform.
( 2) bolt tensioning at least a load applied ( i.e. 1 / 10 of the anchoring force, so that the fastening point ) and the rod body is completely flat, ensure a pull data accurate.
( 3) anchorage body and the pedestal of concrete strength are greater than 15MPa ( or at least 7 days after grouting, the curing time ) can be a pull.
( 4) bolt tensioning to 1.1-1.2 design axial tension #118alue when Nt, soil is sandy to maintain 10min for cohesive soil, maintaining a 15min, then unloaded to the load lock lock operation. Bolt tensioning load grading observation time to comply with the provisions of the table below.
( 5) bolt locking work, should be used to meet the technical requirements of the anchorage ( omitted) tensioning load grading observation time ( min ) sandy soil clay. Soil 0.1Nt 55 0.25Nt 55 0.50Nt 55 0.75Nt 55 1.0Nt 510 1.1-1.2Nt 1015 locking load 1010
( 6) the anchor rod is locked, if found to have obvious loss of prestress, should undertake compensating tensioning. |
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