The long anchor cable is an advantageous measure to restrain the deformation of the rock mass after excavation and to reinforce the unstable rock mass.
The long anchor cable support member is a deep hole with a certain diameter that is reinforced, and then the steel wire or steel hinge wire with the anchor head is put into the hole and locked by tension to achieve the purpose of reinforcing the rock mass. Or fill the full hole with cement mortar to unite the steel rope or steel hinge line, and after it is united, it can strengthen the unstable rock mass. The typical structure of a long anchor cable is as follows.
The structure of the long anchor cable mainly includes:
A. Anchor head The anchor head of the long anchor cable has a mechanical anchor head, a bonded cat head and a composite drill bit combined with the two, which is a kind of mechanical drill bit.
The cemented drill bit is formed after the steel wire or steel strand is drilled and drilled, and the cement mortar is filled in a length of the bottom of the hole to be solidified.
B. The shaft part of the rod body is usually made of steel wire or steel strand. Since the steel strand of the steel strand has a large diameter, the stranded strand formed by the combination is more rigid and easy to be placed in the hole, and because the surface is not Oiling eliminates the cleaning process and ensures the grip strength between the cement mortar and the application.
In the production practice, high-strength round steel is also used to make the rod body. When the hole depth is large, the rod body is connected by a plurality of fixed length rods through threads (or other means).
C. The long cable anchor of the wire loop is a measure adopted in the case where the rock mass to be reinforced is thick, and it is long and the force of tension is large (several hundred kilograms to several thousand kilobytes or more). Therefore, a plurality of flexible noose cables are generally placed in the holes to jointly bear a large tensile stress. In order to make these strands not entangled in each other in the holes, each of them is erected by a wire loop at a certain distance along the entire length of the anchor hole to achieve this purpose. The wire loop is shown.
D. The stoppage of the stop valve is generally placed on the upper part of the first grouting section to ensure the design length of the first grouting section. The grouting hole is provided on the grouting pipe to allow the grouting pipe to pass through and inject mortar into the bottom of the hole. When filling the required length according to the design, the one-way reverse closing on the stop valve closes to avoid the outflow of the mortar, thus forming the first grouting section, that is, forming the bonded bit. The length of the first grouting section depends on the tensile force, the cement mortar marking, the bonding strength of the mortar column and the wall of the hole, and the strength of the cement mortar and the grip of the shaft.
E. The bearing plate of the bearing plate of the orifice is connected with the guiding pipe as a whole. The guiding pipe part comprises a human anchor hole, and the bearing plate covers the opening to bear the pressure from the tensioning jack when the tensioning body is pulled, to protect the hole The rock mass in the mouth part does not collapse. The bearing surface should be perpendicular to the axis of the anchor hole to ensure the tensile quality.
F. Anchor block and anchor plug When prestressing is applied to the anchor case by using the prestressed long anchor cable, the applied prestressing force is locked by the anchor block and the anchor plug outside the orifice, and the structural form of the anchor block and the anchor plug.
The long anchor cable support member is a deep hole with a certain diameter that is reinforced, and then the steel wire or steel hinge wire with the anchor head is put into the hole and locked by tension to achieve the purpose of reinforcing the rock mass. Or fill the full hole with cement mortar to unite the steel rope or steel hinge line, and after it is united, it can strengthen the unstable rock mass. The typical structure of a long anchor cable is as follows.
The structure of the long anchor cable mainly includes:
A. Anchor head The anchor head of the long anchor cable has a mechanical anchor head, a bonded cat head and a composite drill bit combined with the two, which is a kind of mechanical drill bit.
The cemented drill bit is formed after the steel wire or steel strand is drilled and drilled, and the cement mortar is filled in a length of the bottom of the hole to be solidified.
B. The shaft part of the rod body is usually made of steel wire or steel strand. Since the steel strand of the steel strand has a large diameter, the stranded strand formed by the combination is more rigid and easy to be placed in the hole, and because the surface is not Oiling eliminates the cleaning process and ensures the grip strength between the cement mortar and the application.
In the production practice, high-strength round steel is also used to make the rod body. When the hole depth is large, the rod body is connected by a plurality of fixed length rods through threads (or other means).
C. The long cable anchor of the wire loop is a measure adopted in the case where the rock mass to be reinforced is thick, and it is long and the force of tension is large (several hundred kilograms to several thousand kilobytes or more). Therefore, a plurality of flexible noose cables are generally placed in the holes to jointly bear a large tensile stress. In order to make these strands not entangled in each other in the holes, each of them is erected by a wire loop at a certain distance along the entire length of the anchor hole to achieve this purpose. The wire loop is shown.
D. The stoppage of the stop valve is generally placed on the upper part of the first grouting section to ensure the design length of the first grouting section. The grouting hole is provided on the grouting pipe to allow the grouting pipe to pass through and inject mortar into the bottom of the hole. When filling the required length according to the design, the one-way reverse closing on the stop valve closes to avoid the outflow of the mortar, thus forming the first grouting section, that is, forming the bonded bit. The length of the first grouting section depends on the tensile force, the cement mortar marking, the bonding strength of the mortar column and the wall of the hole, and the strength of the cement mortar and the grip of the shaft.
E. The bearing plate of the bearing plate of the orifice is connected with the guiding pipe as a whole. The guiding pipe part comprises a human anchor hole, and the bearing plate covers the opening to bear the pressure from the tensioning jack when the tensioning body is pulled, to protect the hole The rock mass in the mouth part does not collapse. The bearing surface should be perpendicular to the axis of the anchor hole to ensure the tensile quality.
F. Anchor block and anchor plug When prestressing is applied to the anchor case by using the prestressed long anchor cable, the applied prestressing force is locked by the anchor block and the anchor plug outside the orifice, and the structural form of the anchor block and the anchor plug.
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