A kind of hard rock tunnel excavation construction method
A technology of tunneling and construction methods, which is applied to tunnels, earthwork drilling, mining equipment, etc., to achieve the effects of saving investment costs, improving recycling rates, and improving construction efficiency
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Embodiment 1
[0044] For the surrounding rock with relatively soft texture, the construction method is as follows: the face 1 is divided into an upper half 6 and a lower half 7 along the midline, and a cantilever roadheader is used to excavate the upper part of the upper step. A deep groove 2 is cut from the bottom to the top at the midpoint of the midline. The depth of the deep groove 2 is 100cm and the width is 50cm. Then the deep groove 2 is used as the centerline to separate the width of the deep groove 2 from the bottom to the top. A number of equally spaced deep grooves 2 are formed, and a supporting stone wall 3 is formed in the middle of the adjacent deep grooves 2. The width and height of the supporting stone wall 3 are the same as the width and depth of the deep groove 2. In order to prevent the support of the upper half 6 When the wall is broken, it affects the inverted arch 8 and the lower half 7 of the palm face 1, so the upper end and the lower end of each supporting stone wall...
Embodiment 2
[0046]For the surrounding rock with relatively hard texture, due to the relatively hard material, that is, during the construction process, the accident of collapse of the inverted arch 8 is not easy to occur. 7. Use the cantilever roadheader to excavate the upper part of the upper step. Specifically, use the cutting head to cut a deep groove 2 from bottom to top at the midpoint of the midline. The depth of the deep groove 2 is 100cm and the width is 50cm, and then use this The deep groove 2 is the distance between the center line and the width of the deep groove 2 on both sides, and then several equally spaced deep grooves 2 are cut from bottom to top. The deep groove 2 is covered with the entire upper half 6 of the face 1. 2. A supporting stone wall 3 is formed in the middle, and several parallel deep grooves 2 divide the upper half 6 of the face 1 into several supporting stone walls 3. The width and height of the supporting stone wall 3 are the same as the width and depth of...
Embodiment 3
[0048] Different from Embodiment 1, in this embodiment, the depth of the deep groove 2 is 120cm and the width is 60cm, the size of the corresponding supporting stone wall 3 is 120cm in height and 60cm in width, and the size of the hole 4 is 60cm in depth and 60cm in width. 60cm.
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