Fissure-contained rock soil stratum prestressed anchor cable grouting and anchoring construction method

Abstract

The invention discloses a fissure-contained rock soil stratum prestressed anchor cable grouting and anchoring construction method. Multiple prestressed anchor cables uniformly distributed on the same one plane are adopted to reinforce a slope to be reinforced; the method comprises the following steps: (1) the rock mass joint fissure development degree of each rock stratum is determined; (2) the lengths of anchoring sections and the hole port positions of anchor cable holes are determined; the prestressed anchor cables include anchor cable bodies, primary grouting pipes and secondary grouting pipes; anchoring tools are mounted at the back ends of the anchor cable bodies; and the anchor cable bodies include multiple steel strands; and (3) the prestressed anchor cables are grouted and anchored: when any one prestressed anchor cable is grouted and anchored, the construction includes the steps of drilling, placement of the anchor cables, normal-pressure grouting, high-pressure grouting, tensioning of the anchor cables and anchor sealing. The method is simple in steps, reasonable in design, convenient to construct, high in construction efficiency and excellent in use effect, and can conveniently and quickly finish the reinforcing process of the slope to be reinforced; and the adopted prestressed anchor cables are low in cost and higher in anchoring force, and can effectively reinforce the slope to be reinforced.

Description

Technical field [0001] The invention belongs to the technical field of rock-soil stratum reinforcement construction, and particularly relates to a construction method for grouting and anchoring a pre-stressed anchor cable in a rock-soil layer containing fractures. Background technique [0002] Fractured rocky soil layers refer to rocky soil layers with fissures, and fissures refer to rock mass joint fissures. Therefore, fractured rocky soil layers mainly refer to fractured rock layers, such as karst fractured stratum, weathered rock layer, etc. For rock and soil layers, two grouting methods, namely "mortar pump sealing grouting method" and "secondary split grouting method" are usually used for reinforcement. Among them, the "mortar pump sealing grouting method" refers to the installation of a grouting pipe for the orifice after sealing the orifice of the anchor cable with quick-setting cement. One end of the orifice grouting pipe extends into the orifice, and the other end is con...

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Problems solved by technology

In actual construction, the above two reinforcement methods can effectively squeeze out water and air and have the advantages of rust resistance and durability, but the scope of application is narrow, and they are only suitable for soft rock or soil formations, and the above two reinforcement methods have the following five Insufficient aspects: ① Did not check complex geological conditions and find out the development of fractures in strata at different stages; ② Cannot completely remove the water and sand in the cave; Pressure grouting, the second splitting grouting can not achieve the fullness of the grout, can not effectively fill the rock-soil cracks and rock seepage gaps, and the grouting anti-leakage effect is poor; ④ There is no reasonable grouting for each anchor cable, so the construction is difficult , the construction progress is slow, the cost is high, and there is a lot of waste; ⑤The pull-out test of the anchor cable cannot reach the maximum load value and bearing capacity, and the project quality cannot be guaranteed, the anchoring quality is poor, and the cost is high

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