Multistage bag-type compression anchor bar

Abstract

The multiple section bag type extruding anchor bolt for reinforcing foundation pit, slope, tunnel and underground engineering in complicated stratum includes one bolt body connected to the guide head, and one tubular fabric bag around the anchoring section of the bolt body. The tubular fabric bag has diameter 5-10 cm greater than that of the anchor bolt hole, the guide head end tied to the bolt body and the upper end tied to the bolt body together with the inserted grouting pipe so that cement slurry or cement mortar may be deposited into the bag. The multiple section bag type extruding anchor bolt has simple structure, capacity of inhibiting flow loss of cement slurry or cement mortar, increased radial extrusion force and raised upright resistance, and is especially suitable for use in bad ground.

Description

technical field [0001] The invention relates to a multi-section bag-type extruded bolt, which is used for reinforcement and protection of foundation pits, side slopes, tunnels and underground projects in various complex formations. Background technique [0002] In the reinforcement and protection technology of foundation pits, slopes, tunnels and underground projects, anchor rods are widely used. There are many types of anchor rod bodies, each with its own characteristics, and the corresponding construction methods are basically the same. In the existing anchor rod, after drilling in the formation, the anchor rod body is packed into the borehole, and then cement slurry or cement mortar is poured into the space between the rod body and the borehole through a grouting pipe for anchoring. Existing bolt technology for loose or groundwater fluidity of the soil layer and joint cracks developed rock formations or dissolved rock formations, the loss of cement slurry is large, can no...

AI Technical Summary

Problems solved by technology

For loose or groundwater fluid soil layers and rock formations with developed joints and cracks or eroded rock formations, the existing bolt technology has a large loss of cement slurry and cannot guarantee the fullness and integrity of the grouting body; it is used for large compression deformation Due to the lack of radial extrusion during grouting, the weak soil layer will weaken the bond friction strength between the anchor and the formation

In a word, in the complex stratum mentioned above, the use of the current anchor bolt structure will seriously reduce the anchor pullout force, the anchoring effect will be poor, and the long-term safety and reliability of the project will be damaged.

Images