SU1476146A1 - Roof bolt setting method - Google Patents

Abstract

The invention relates to the field of fastening of mine workings and makes it possible to reduce the energy consumption for feeding a hardening dispersion-reinforced mixture into the hole by increasing the reinforcement ratio directly in the hole. A two-channel injector / I / 2 is installed in the drilled hole 1. One channel 2 has holes 3, with a diameter less than the length of reinforcing fibers, which are made of basalt or aluminoborosilicate fiberglass. An internal delivery 5 and an external suction 6 hose are connected to AND 2, through which the dispersion-reinforced mixture is respectively injected and simultaneously sucked. The latter passes through the holes 3 in the channel I 2, and the fibers are filtered out. Their content in the mixture in the hole 1 increases. The mixture pressure And 2 is pushed from the bottom of the hole 1 to the mouth. The hole 1 and the cracks in the rock around it are filled with a hardening mixture with a high reinforcement ratio. 2 hp ff, 2 ill.

Description

6 suction hoses, through which the dispersion-reinforced mixture is respectively injected and simultaneously sucked. The latter passes through the holes 3 in the channel I 2, and the fibers are filtered out. Content

them in the mixture in borehole 1 is enlarged. The pressure of the mixture And 2 is pushed from the bottom of the hole 1 to the mouth. The hole 1 and the cracks in the rock around it are filled with a hardening mixture with a high reinforcement ratio. 2 hp f-ly. 2 Il.

one

The invention relates to the fastening of mine workings, and in particular to methods of fastening anchors made of dispersion-reinforced concrete, and can be used in the construction of underground structures, the operating conditions of which provide for contact with aggressive alkaline or acid-containing aqueous medium temperature range, the possibility of seismic shocks.

The aim of the invention is to reduce the energy consumption for feeding a hardening dispersion-reinforced mixture into the hole by increasing the reinforcement ratio directly in the hole.

Figure 1 shows a borehole, filling the mixture with an injector (dispersed reinforcement is conventionally shown with strokes, and cement-sand mixture is shown with dots); Figure 2 shows the preferred directions of movement of these components in the borehole and the injector (the solid line corresponds to the dispersed reinforcement, and the dotted line to the cement-sand mixture).

i

The method is carried out as follows.

In the reinforced massif, a hole is drilled with the specified diameter, depth, and density of installation of anchors. A rigid dual-channel injector 2 is made into the hole, made, for example, in the form of a hollow cylinder with double walls and a beveled end, in which there are holes 3 with a diameter of 5-10 mm for passing cement-sand mixture 4 into the suction channel of the injector. The holes 3, whose diameter is less than the length of the reinforcing elements, simultaneously prevent the removal of fibers from the hole,

the length of which is usually 20-30 mm. At the other end of the injector, internal pressure 5 and external suction 6 material flexible hoses are connected to the internal cavity and the cavity between two walls with a transverse dimension of 15-20 mm. They, in turn, are connected to the injection and suction pumps, respectively (not shown). The external dimensions of the injector are determined by the diameter and depth of the holes. The injected injector should be at a distance of 150-200 mm from the bottom of the hole.

The prepared dispersion-reinforced mixture with basalt fiber or fiber of aluminosilicate fiberglass is fed under pressure through the internal channel of the injector. The reinforcement ratio of the supplied feed mixture 7 corresponds to the optimum for the processes of preparing and transporting the mixture. At the bottom of the hole 8, a circular motion of the mixture occurs due to the supporting pressure of the mixture 7 and the skoshenchennmu end face of the injector. At the same time, part of the cement-sand mixture is pressed through the holes 3 into the external channel of the injector and is sucked out for reuse. In zone 8, the final mixture is formed with filtered fibers and the reinforcement ratio (volume content of fibers) is higher than in the initial mixture.

In the process of filling the hole with the mixture, the injector, for example, using a mechanical manipulator (not shown), is slowly removed from the hole so as not to reduce the supporting pressure in the zone of formation of the final mixture, and the mixture is repeatedly passed through the injection-suction equipment. Thus, the entire hole is filled with the formed mixture. At the same time, the cement-sand mixture of fractures is actively filled in the massif in the area of the hole. The parameters of the filling process (pressure of the mixture, the speed of movement of the injector) are selected depending on the specified properties of the anchor, type of mixture, degree of disturbance of the fixed array.

Claims (3)

1. Method of installing an anchor, including drilling a hole, installing an injector and forcing through it a hardening mixture dispersed-reinforced with fibers, with a gradual pushing of the injector from the bottom of the hole to the mouth the pressure of the mixture, about t l y u u i6 0 so that, in order to reduce the energy supply to the hole, the hardening dispersion-reinforced mixture by increasing the reinforcement ratio directly in the hole, the last two-channel injector is installed in which one of the channels has openings with a diameter less than the length of the reinforcing fibers it is sucked into the hole through the holes in the injector channel and the fibers are filtered out. 2. The method according to claim 1, about tl and h and h - y and with the fact that the fibers are made of basalt. 3. Method pop. 1, characterized by the fact that the fibers are made of aluminosilicate fiberglass.  /  g t $ ///////// 1