Novel tunnel advanced small guide pipe, advanced support system and construction method
An advanced small conduit and tunnel technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as failure to reach design pressure, influence on construction organization arrangements, and inability to spread and solidify grout, so as to ensure construction safety and avoid encirclement. Rock deformation hard to control effect
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0029] see figure 1 As shown, the embodiment of the present invention provides a new type of tunnel leading small catheter, which includes a catheter body 1 and a sleeve 2. One end of the catheter body 1 is provided with a grouting port, and the other end is provided with a number of grouting holes 11. The sleeve 2 is fixed. Located outside the conduit body 1 , the sleeve 2 covers a part of the grouting holes 11 , and another part of the grouting holes 11 is located on the side of the sleeve 2 away from the grouting port.
[0030] The casing 2 provided can close the grouting hole 11 that is not inserted into the surrounding rock, so as to avoid the situation of grout leakage when using the advanced small conduit for grouting operation, resulting in the insufficient grouting pressure in the surrounding rock. When the design pressure is reached...
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