Key technology for efficient and green drilling of variable diameter anchor against uplift in silty clay and weathered siltstone
In order to increase the drilling efficiency of variable diameter anchor against uplift in silty clay and fully and strongly weathered siltstone,the long spiral drilling machine was improved to provide air supply,the key technology for forming hole of variable diameter anchor against uplift was developed with the high-pressure rotary jet drilling machine for expanding hole after guiding hole of the long spiral drilling machine,and construction parameters were proposed.Based on the key technology and parameters,in addition to ensure that the anti-pull force meets the design requirement,time of construction technology of the high-pressure rotary jet drilling machine for expanding hole after guiding hole of the long spi-ral drilling machine is 13%less than that of construction technology of the conventional high-pressure rotary jet drilling machine.In view of dust generated by the long spiral drilling machine of high-pressure air supply,the dust reduction structure was developed to eliminate environmental problem and harm to the operators caused by dust so as to achieve green construction.
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维普
