Weak surface rock slope grouting method and anchor tube for grouting

Abstract

The invention discloses a weak-plane rock side slope grouting method and an anchor pipe for grouting. An anchor hole is drilled; the diameter of the anchor hole is more than the outside diameter of the anchor pipe body of at least 100 mm; the anchor pipe is placed in the anchor hole; concrete is filled in the anchor hole mouth; suspended grout in a double layer stirring mill is pressed to the anchor pipe for grouting by a grouting pump; when the grouting flow rate is more than the flow rate of grout absorption by rock or the grouting pressure is larger than the shearing resisting intensity of fissure filling in a shallow layer rock body, a grout returning valve is started in order that the grout in the hole returns to a grout storage barrel of the double layer stirring mill for circulating grouting. The weak-plane rock side slope grouting method and the anchor pipe for grouting effectively solve the difficult problems that the prior pressing in type grouting is easy to leak the grout, can not completely fill the fissure and can not be suitable for reinforcing the shallow layer. The circulating grouting method of the invention enlarges the grouting scope, improves the injection rate by the single hole, can effectively reinforce the water seepage and corrosion resisting capacity in the interlayer of the side slope and improve the stabilizing capacity of the whole side slope. The anchor pipe of the invention has the advantages of simple structure, easy manufacture and low costs.

Description

technical field

[0001] The invention relates to a rock mass internal reinforcement method and a device used in geotechnical engineering, in particular to a grouting reinforcement method and a grouting device used for rock slopes with weak interlayers. Background technique

[0002] In geotechnical engineering, rocky slopes with weak interlayers are prone to landslides under the action of rainfall and groundwater. At present, in order to prevent shallow landslides caused by water erosion piping on weak interlayer rock slopes, there are mainly two reinforcement methods used: one is the combined method of bolt reinforcement rock formation and shotcrete sealing slope surface; the other It is used for high-pressure grouting in rock formations to fill karst caves, faults, weak interlayers and joint fissures.

[0003] There are serious shortcomings in the joint reinforcement method of anchor bolt and spray mix: the temperature difference between the atmosphere and the rock layer ca...

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