The construction of advanced anchor rods or advanced small steel pipe support should meet the requirements.
2014-08-24
(1) Fore-pushing anchor rods or fore-pushing small steel pipes should be used in conjunction with steel frame supports and should pass through the web of the steel frame;
(2) The external angle between the fore-pushing anchor rods or fore-pushing small steel pipes and the longitudinal excavation profile of the tunnel should be 5 to 10°, and the length should be greater than the cyclic advance, preferably 3 to 5m;
(3) Fore-pushing anchor rods should use early-strength cement mortar anchors;
(4) The insertion length of fore-pushing small steel pipes into drilled holes should not be less than 90% of the pipe length.
Shenyang Tengfei Iron Corporation
Shenyang Tengfei Steel Pipe Co., Ltd.
Address: No.6 A 3, No.13 Road, Economic and Technological Development Zone, Shenyang City, Liaoning Province
E-mail:tfwelcome@163.com
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