Tunnel water seepage and harmful gas discharge structure and semi-closed ice-filled drilling construction method
A technology of harmful gases and construction methods, applied in tunnels, tunnel linings, drainage, etc., can solve problems such as high separation costs, difficulty in separating harmful gases from water, and high operational safety risks
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Embodiment 1
[0040] Such as figure 1 As shown, the tunnel 6 has no requirement for the discharge of harmful gases, and is mainly aimed at water seepage control. A tunnel water seepage and harmful gas discharge structure according to the present invention includes a water permeable pipe 1, and the water permeable pipe 1 is arranged in the water permeable section of the borehole In 21, the position of the borehole is determined according to the position of the water seepage point. It is drilled from the side wall of the tunnel 6 with an inclination. The inclination angle between the borehole and the horizontal plane is 5-10°. As with the grouting section 22, the length of the grouting section 22 is the same as the thickness of the lining concrete of the tunnel 6, and the length of the permeable section 21 is, for example, 5-10m, if the thickness of the lining concrete of the tunnel 6 is uncertain , the length of the grouting section 22 is 0.5-0.6m. A water-stop member 23 is set between the ...
Embodiment 2
[0047] A kind of semi-enclosed ice-filled drilling construction method according to the present invention adopts the discharge structure as described in Embodiment 1, and comprises the following steps:
[0048] a. According to the position and range of the water seepage point on the side wall of the tunnel 6 and the escape point of harmful gas (if any), correspondingly drill downwardly inclined boreholes;
[0049] b. Set a permeable pipe 1 in the permeable section 21 of the borehole, and then insert a drain pipe 4 into the permeable pipe 1, so that the port of the drain pipe 4 goes deep into the bottom of the permeable pipe 1;
[0050] c. Fill the permeable pipe 1 with ice cubes 3 and compact it, and then install a water-stop member 23 to block the permeable section 21;
[0051] d, enter the grout 24 into the borehole to form the grouting section 22, and complete the construction of the discharge structure; the grouting pressure can be increased during grouting, and the grout ...
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