Wing plate type advanced small pipe used for advance support of soft broken surrounding rock tunnel
A technology of leading small conduits and crushing surrounding rock, applied in tunnels, tunnel linings, shaft equipment, etc., can solve the problems of high labor intensity, affecting safety, difficult to fully diffuse the slurry, etc., to improve the support strength and increase the diffusion radius. , the effect of increasing the support area
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0018] figure 1 , figure 2 Among them, the small conduit 1 is made of hot-rolled seamless steel pipe. Slurry overflow holes 3 are drilled on the upper part and the left and right sides of the small conduit 1, which are distributed in a quincunx shape; the top of the small conduit 1 is tapered and closed. The outer diameter of the small conduit 1 is φ30-50mm, the thickness is 3mm, and the aperture of the overflow hole 3 is φ8-10mm. The slurry overflow holes 3 are arranged in a quincunx shape with a spacing of 10cm, and no holes are drilled within 0.6m of the tail to prevent slurry leakage. The airfoil plate 2 is welded on the left and right sides of the small conduit 1, and the welding seam is located below the left and right slurry holes 3 of the small conduit 1. The airfoil 2 is a hot-rolled steel plate with a horizontal length of 15 cm and a thic...
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