KR101029320B1 - Rock bolt and fixation method the rock bolt - Google Patents

Abstract

The present invention relates to a rock bolt for reinforcing rock crushing cod and a method for reinforcing rock crushing cod using the same, by manufacturing a rock bolt using an injection type C tube tube, by manufacturing a C type tube tube using a relatively inexpensive carbon steel pipe. As a result, the manufacturing cost of rock bolts can be reduced, and further construction costs can be reduced.

In addition, by expanding the rock bolt expansion process and grout material injection process simultaneously, the construction procedure can be simplified, thereby reducing the construction equipment and workforce used, and shortening the construction period. The grout material can be injected from the inside of the construction hole to quickly penetrate the grout material into the ground gap, so that the soft ground can be quickly responded, and the grout root penetrates deeply into the ground to make contact with the ground. As it can increase the binding force, it is effective for stabilization of the ground. Since it does not use water pressure, it is safe because there is little worry of corrosion by water, and it is easy to maintain after construction.

Rock bolt, extension, breaking, grout

Description

Rock bolt for reinforcing rock crushing section and method for reinforcing rock crushing section using it {ROCK BOLT AND FIXATION METHOD THE ROCK BOLT}

The present invention relates to a rock bolt for reinforcing rock crushing cod and to a rock crushing cod reinforcing method using the same by proceeding the expansion process of the rock bolt and the grout material injection process at the same time.

In general, rock bolts are used as supporting materials for stabilizing structures when constructing tunnels and underground storage areas in rock areas.

The rock bolt method using the rock bolt blasts the excavation hole to the required depth as a perforator in the rock excavation surface of the rock or tunnel exposed by blasting the rock, and injecting cement mortar after inserting the rock bolt in the excavation hole or After pre-injecting the cement mortar, the rock bolt is inserted, and the pressure plate is inserted into the end of the rock bolt protruding from the excavation hole through the shotcrete or concrete that has been poured into the outside of the excavation surface. The construction stabilized the structure with simple supporting force by rock bolts to prevent the rock collapse.

Conventional rock bolts are classified into wedge type, rotational expansion type, resin filling type, cement mortar filling type, etc., and wedge type and rotation expansion type are called mechanical fixing type. There is a method of injecting cement mortar after fixing the rock bolt, but since the construction procedure is complicated, such as mortar flows out of the excavation hole, the use is avoided.

In addition, the resin-filled type can be rapidly quenched with a chemical product to obtain initial tensile strength, but there is a problem that the durability changes due to chemical change over a long period of time, and the construction cost is high, and the cement mortar-filled type has an early drawing strength before curing. It was difficult to obtain.

On the other hand, the Republic of Korea Utility Model Publication No. 20-0149280 discloses a technique for preventing ground collapse lock bolts are installed to prevent the ground in the tunnel to collapse in advance.

This conventional rock bolt is described as being secured primarily by the locking piece having elastic force and at the same time secured secondary locking and fixing by the split fixing piece, but the inner peripheral surface of the hole according to the condition of the rock If it is made of soil, it will be able to settle, but if it is rock, the plate spring member of the fixed body will not be able to dig into it, and the primary body will not be able to be fixed by the elastic member. Since the slides are pulled outwards, the secondary fixing by the split fixing piece and the moving shaft is also impossible, and the fixing of the lock bolt is impossible.

Then, in the rock drilling, the tip of the rock bolt main body is fixed, and after the cement mortar is injected into the drilling hole, the flat washer is inserted and the nut is fastened to the end of the rock bolt main body to complete the fixing work. However, since it is injected from the outside after installing the rock bolt, the cement mortar cannot be evenly filled in the gap between the inner shaft of the hole and the rock bolt, and the cement mortar flows immediately after being injected with fluidity, thereby increasing the fixing force. There was a problem that became impossible.

In addition, the conventional rock bolt is a structure that inserts the rock bolt body on the inner circumferential surface of the rock and pulls it to the outside to fix the lock bolt while pulling the lock bolt body and tightening the lock nut. There was this.

Furthermore, in the conventional rock bolt, a three-part divided fixing piece having a circumferential shape is connected to a hemisphere and a connecting piece, respectively, and a locking piece that is opened in the outward direction is fixed to the side outer periphery of the divided fixing piece, and the locking piece and the connecting piece are divided. It is fixed with rivets in the state of being inserted into the fixing grooves formed on the outer periphery of the fixing piece, and the disc and the connecting piece are also fixed with rivets, and the fixing body is composed. There was this.

The present invention has been made to solve the problems of the prior art, has the following object.

First, the present invention can reduce the manufacturing cost of the rock bolt, and further to manufacture the rock bolt to the injection-type C tube tube to reduce the construction cost, to manufacture the C tube tube using a relatively inexpensive carbon steel pipe There is a purpose.

Second, the present invention can simplify the construction process, thereby reducing the construction equipment and workforce used, and can shorten the construction period to reduce the construction cost, expansion process of rock bolts and There is another purpose to allow the grout material injection process to proceed simultaneously.

Third, the present invention is to inject the grout material from the inside of the construction hole to quickly penetrate the grout material into the ground gap, it is possible to respond quickly to the soft ground, and to form a grout root that penetrates deeply into the ground and with the ground Another purpose is to increase cohesion.

Rock bolt for reinforcing rock crushing section to achieve the object of the present invention is made of a C-type tube tube, both ends of the C-type tube tube is constrained by the axial coupling of the first and second outer tubes of the band, respectively In addition, by welding between the inlet of the both ends and the first, second outer tube to be sealed, and forming a hole penetrating the C-type tube tube in the outer diameter of the first outer tube located at the rear of the entry direction of the outer tube Forming a grout inlet for filling the grout material therein, and forming a pressure relief process machined to break when the internal filling pressure of the grout is greater than an acceptable range in the outer diameter of the C-tube tube at the opposite end where the grout inlet is formed. It features.

The pressure relief processing part linearly processes a groove having a predetermined depth on the outer surface of the C-type tube tube, and forms a transverse cutting line in the circumferential direction and extends from both ends of the transverse cutting line toward the second outer tube, respectively. It is characterized by forming a longitudinal cutting line.

The pressure relief processing part linearly processes a groove having a predetermined depth on the outer surface of the C-tube tube, and forms a transverse cutting line in the circumferential direction, and extends from one end of the transverse cutting line toward the second outer tube. It is characterized by forming a longitudinal cutting line.

In addition, the pressure relief processing unit to process a groove having a predetermined depth on the outer surface of the C-tube tube linearly, forming a transverse cutting line in the circumferential direction, and extending from the center of the transverse processing line toward the second outer tube It is characterized by forming a direction overhead line.

In addition, the pressure relief processing is characterized in that the surface processing to have a predetermined depth on the outer surface of the C-type tube tube.

The C-type tube tube is characterized in that the carbon steel tube.

And, the carbon steel pipe is iron (Fe) 98.28 ~ 99.25% by weight, carbon (C) 0.10 ~ 0.30% by weight, silicon (Si) 0.2 ~ 0.5% by weight, manganese (Mn) 0.4 ~ 0.8% by weight, phosphorus (P) It is characterized by consisting of a composition of 0.02 to 0.06% by weight, sulfur (S) 0.02 to 0.06% by weight.

The grout material may be any one selected from cement, iron, asphalt, and chemical grout systems.

Method of reinforcing rock crushing cod for achieving the object of the present invention, the step of drilling a construction hole in the ground; Mounting a rock bolt in the construction hole; Connecting the first outer tube of the rock bolt to the adapter of the filling device and filling the grout material through the grout inlet; Allowing the C-type tube tube of the rock bolt to be expanded by the filling pressure of the grout material to be in close contact with the inner wall of the construction hole; Supplying the filling pressure of the grout material in excess so that the pressure relief processing part of the rock bolt is broken; And maintaining the filling pressure of the grout material so that the grout material discharged through the broken pressure release processing part fills the gap between the rock bolt and the construction hole and simultaneously penetrates into the gap between the ground to form the grout root.

And, when the pressure relief processing unit is broken characterized in that the incision surface is expanded to the outside of the C-tube tube to form a separation prevention projection fixed to the ground.

The present invention has the following effects.

First, the present invention is to manufacture a rock bolt using an injection type C tube tube, but by manufacturing a C-type tube tube using a relatively inexpensive carbon steel pipe, it is possible to reduce the manufacturing cost of the rock bolt, further reducing the construction cost Has an effect.

Secondly, the present invention can simplify the construction process by proceeding the expansion process of the rock bolt and the grout material injection process at the same time, it is possible to reduce the construction equipment and workforce used, and to shorten the construction period It has the effect of reducing the construction cost.

Third, the present invention is to inject the grout material from the inside of the construction hole to quickly penetrate the grout material into the ground gap, it is possible to respond quickly to the soft ground, and to bond with the ground by using the grout root penetrating deep into the ground It is effective in stabilizing the ground, and because it does not use water pressure, it is safe because there is little worry of corrosion by moisture, and it is easy to maintain after construction.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the rock bolt for reinforcing rock crushing cod according to the present invention and a method for reinforcing rock crushing cod using the same as follows.

Rock bolt

1 is a front view of a rock bolt according to the present invention.

Rock bolt 100 according to the present invention as shown in the drawings is a structure that is constructed for the reinforcement of the incision surface, such as rock crushing section, the configuration is provided with a C-shaped tube tube 110 extending in the longitudinal direction do.

C-type tube tube 110 is produced using a carbon steel steel pipe, briefly describe the manufacturing process, first proceeds to the primary molding process of plastic deformation of the circular steel pipe to have a "C" shaped cross section.

At this time, the primary molding is press-pressed so that the center upper surface of the circular steel pipe abuts the lower surface to process the cross section of the "C" shape.

At this time, the mold used is a linear press mold extending in the longitudinal direction so that the "C" cross-section can be continuously formed in the longitudinal direction.

And, as described above, the "C" shaped cross section that is primarily processed is open to the left and right, and undergoes a secondary processing step for filling in a round shape.

At this time, the mold used is a mold frame of the left and right half body shape to press the "C" shaped left and right outer surface of the steel pipe to be collected in the center.

The C-shaped tube tube 110 manufactured as described above has a shape similar to that of a circular steel tube, but if necessary, to secure an available area that can be expanded to the outside as much as the recessed area.

The C-type tube tube 110 can be produced using a carbon steel pipe, the carbon steel pipe is iron (Fe) 98.28 ~ 99.25% by weight, carbon (C) 0.10 ~ 0.30% by weight, silicon (Si) 0.2 ~ 0.5 weight %, Manganese (Mn) 0.4 to 0.8% by weight, phosphorus (P) 0.02 to 0.06% by weight, sulfur (S) is preferably produced in a composition of 0.02 to 0.06% by weight.

More preferably, iron (Fe) 98.77% by weight, carbon (C) 0.2% by weight, silicon (Si) 0.35% by weight, manganese (Mn) 0.6% by weight, phosphorus (P) 0.04% by weight, sulfur (S) 0.04% by weight It can be produced in a composition of%.

C-type tube tube 110 is coupled to the first and second outer tube 120, 130 in the form of a band at both ends of the tube to maintain the internal airtight (氣密).

The first and second outer tubes 120 and 130 are made of a tubular body having a ring-shaped cross section that is press-fitted to the outer diameter of the C-type tube tube 110 and restrains the ends of the C-type tube tube 110 from expanding. Play a role.

At this time, the C-type tube tube 110 is a state in which the end is open, so that the complete sealing through the welding operation with the first and second outer tubes (120, 130). That is, through the welding operation, the ends of the first and second outer tubes 120 and 130 are integrated with the ends of the C-type tube tube 110, and at the same time, the barrier layer is formed to completely seal the opening.

Here, the first and second outer tubes 120 and 130 may be manufactured and used in the form of a cap in which one end is blocked and the other end is opened.

In this case, the sealing operation may be completed only by a process of coupling the first and second outer tubes 120 and 130 and the C-type tube tube 110 by interference fit without a separate welding operation.

In this case, in order to improve sealing and bonding force, a method of injecting an adhesive into the caps of the first and second outer tubes 120 and 130 in advance and then curing the adhesive may be used.

The first and second outer tubes 120 and 130 coupled in the same manner as above are manufactured in the same shape, and for convenience, the second outer tube (see FIG. 7) is inserted into the construction hole 11 (see FIG. 7). 130), the outer side of the construction hole 11 is referred to as the first outer tube 120.

At this time, the outer diameter of the first outer tube 120 is formed with a grout injection hole 140 penetrating the C-type tube tube 110.

The grout inlet 140 further combines a separate adapter 160 (shown in FIG. 7) to inject the grout material 20 (shown in FIG. 6C) into the C-shaped tube tube 110. .

At this time, the grout material 20 is to be injected into the C-type tube tube 110 using a separate injection device (not shown), by injecting a predetermined pressure or more, C-type tube tube 110 is expanded to the outside. It acts as a deformable expander.

C-type tube tube 110 is expanded and deformed by the injection pressure of the grout material 20 is fixed to the inner wall of the construction hole (11).

In addition, the grout material 20 is released to the outside of the C-type tube tube 110 after the action of expanding the C-type tube tube 110, the space between the construction hole 11 and the rock bolt 100, of course, rock As a filling material to fill the gap, it will simultaneously play a role.

In order to perform such a role, the present invention is to be broken by the internal pressure when the internal filling pressure in the outer diameter of the C-type tube tube 110 of the opposite end where the grout injection hole 140 is formed is more than the allowable range. The processed pressure relief processing unit 150 is formed.

In more detail with respect to the pressure relief processing unit 150, the pressure relief processing unit 150 is to cut the outer surface of the C-type tube tube 110 to a predetermined thickness to form an artificial weakening portion.

At this time, the cutting depth for weakening is related to the expansion pressure of the C-type tube tube (110).

That is, the C-type tube tube 110 is sufficiently inflated in consideration of the injection pressure of the grout material 20 injected into the C-type tube tube 110, and then the pressure relief processing unit 150 is driven by the excess pressure. It is desirable to cut to a depth that can break naturally.

One or more pressure relief processing unit 150 is formed in the circumferential direction around the outer diameter of the C-type tube tube 110, so that the grout material 20 can be simultaneously released radially.

Hereinafter, with reference to the accompanying drawings will be described a modified embodiment of the pressure relief processing unit 150. 2 to 5 are enlarged perspective views showing various embodiments of the pressure relief processing unit of the rock bolt according to the present invention.

First, the pressure relief processing unit 150 as shown in FIG. 2 forms a lateral processing line 151 in the circumferential direction of the C-type tube tube 110, and the second outer tube from both ends of the lateral processing line 151. An example of forming a longitudinal overhead line 153 extending toward 130 is shown.

When viewed from the plane, the shape of the cutting groove of the "c" shape is processed, the shape after being broken by the excess pressure is shown as a virtual line, when looking at this, the cut surface of the pressure relief processing unit 150 When the pressure is released to the outside of the C-type tube tube (110) is unfolded in the form of hooks on the ground, thereby, the lock bolt 100 is prevented from falling out of the construction hole 11 by ground fluctuations or vibrations The protrusion 157 serves as a role.

Next, the pressure relief processing unit 150 as shown in Figure 3 is to process a groove having a predetermined depth on the outer surface of the C-type tube tube 110 linearly, to form a transverse processing line 151 in the circumferential direction, An example of forming a longitudinal overhead line 153 extending from one end of both sides of the transverse overhead line 151 toward the second outer tube 130 is shown.

When viewed from the plane, the shape of the "b" shaped cutting groove is processed, the shape after being broken by the excess pressure is shown as a virtual line, when looking at this, the cut surface of the pressure relief processing unit 150 When the pressure is released to the outside of the C-type tube tube (110) is unfolded in the form of hooks on the ground, thereby, the lock bolt 100 is prevented from falling out of the construction hole 11 by ground fluctuations or vibrations The protrusion 157 serves as a role.

The pressure relief processing unit 150 as shown in Figure 4 is to process a groove having a predetermined depth on the outer surface of the C-type tube tube 110 linearly, forming a transverse processing line 151 in the circumferential direction, transverse direction An example of forming a longitudinal overhead line 153 extending from the center of the overhead line 151 toward the second outer tube 130 is shown.

When viewed from the plane, the shape of the "T" shaped cutting groove is processed, the shape after being broken by the excess pressure is shown as a phantom line, looking at this, the cut surface of the pressure relief processing unit 150 When pressure is released, it is spread out to the outside of the C-type tube tube (110) to be nailed in the form of hooks, which prevents the lock bolt 100 from being pushed out of the construction hole (11) by ground fluctuations or vibrations. (157) will play a role.

The pressure relief processing unit 150 as shown in FIG. 5 shows an example of surface processing to have a predetermined depth on the outer surface of the C-type tube tube 110.

As shown in the figure, when cutting in a planar shape, the cutting depth at the center of the processing surface is relatively deepest.

Thus, when the fractured shape of the pressure relief processing unit 150 is viewed, it has a form cut in a straight line along the longitudinal direction as shown by the imaginary line of FIG. 5.

The pressure relief processing part 150 of FIG. 5 does not have the function of the anti-separation protrusion 157 as shown in FIGS. 2 to 4, but has an advantage of easy and fast processing.

Reinforcement Method of Rock Fracture Cod using Rock Bolts

Referring to the rock crushing reinforcement method using the rock bolt 100 of the present invention having the configuration as described above is as follows.

6A to 6C are enlarged cross-sectional views illustrating a construction process of the rock bolt according to the present invention, and FIG. 7 is a construction view showing a state in which the rock bolt according to the present invention is installed in a rock crushing section.

First, the construction hole 11 is drilled in the ground of a rock crushing section such as a tunnel construction site.

At this time, the diameter of the construction hole 11 is to be drilled slightly wider than the diameter of the lock bolt 100 to facilitate the operation of mounting the rock bolt 100 to the construction hole 11 can be easily carried out (see Fig. 6a). )

Looking at the mounting state of the lock bolt 100, the second outer tube 130 is inserted into the construction hole 11, the first outer tube 120 is mounted so as to protrude outside the construction hole (11). .

The first outer tube 120 protruding outside the construction hole 11 forms a grout injection hole 140 for injecting the grout material 20.

After the mounting work of the rock bolt 100 is completed, the grout material 20 is injected.

At this time, the grout material 20 may use any one selected from cement, iron, asphalt, and chemical grout.

The adapter 160 is coupled to the first outer tube 120 to inject the grout material 20. At this time, the adapter 160 is in a state connected with a filling device (not shown) for conveying the grout material 20 at high pressure.

The high-pressure injected grout material 20 forms an expansion pressure inside the C-type tube tube 110 so that the outer diameter of the C-type tube tube 110 extends toward the inner wall of the construction hole 11 (see FIG. 6B).

C-type tube tube 110 is in close contact with the inner wall of the construction hole 11 as the outer diameter is expanded.

As described above, after the rock bolt 100 is compressed to the inner wall of the construction hole 11 by the expansion of the C-type tube tube 110, the filling pressure of the filling device is increased to increase the excess pressure in the C-type tube tube 110. To be supplied.

As the excess pressure is supplied into the C-type tube tube 110, the pressure relief processing unit 150 of the rock bolt 100 is broken. (See FIG. 6C, FIG. 7)

The pressure relief processing unit 150 as described above forms an escape prevention protrusion 157 which is fixed to the ground by cutting the incision surface out of the C-type tube tube 110 when broken by excess pressure. It is preferable to unfold toward the entrance of the hole 11.

The grout material 20 discharged through the pressure relief processing unit 150 fills the gap between the rock bolt 100 and the construction hole 11 and penetrates into the gap between the ground to form the grout root 21. To stabilize.

When a plurality of pressure relief processing unit 150 is applied, it is preferable to break a plurality at the same time, but only a portion may be broken without breaking at the same time.

However, even if a part is broken, as the connection between the rock bolt 100 and the construction hole 11 into the gaps, the grout material 20 discharged from any one place can fill the entire construction hole 11. Achieve your purpose.

1 is a front view of a rock bolt according to the present invention.

2 to 5 is an enlarged perspective view showing various embodiments of the pressure relief processing unit of the rock bolt according to the present invention.

Figure 6a to 6c is an enlarged cross-sectional view showing the construction process of the rock bolt according to the present invention.

Figure 7 is a construction view showing a state in which the rock bolt according to the invention installed in the rock crushing section.

<Explanation of symbols for main parts of the drawings>

10: Ground 11: Construction Hall

20: grout ash 21: grout root

100: rock bolt 110: C type tube tube

120: first outer tube 130: second outer tube

140: grout injection hole 150: pressure relief processing

151: transverse cutting line 153: longitudinal cutting line

155: machining surface 157: separation prevention protrusion

160: adapter

Claims (11)

delete It is made of C-type tube tube 110, both ends of the C-type tube tube 110 is constrained by the axial coupling of the first and second outer tube 120, 130 of each of the band shape and of both ends It is welded between the inlet and the first and second outer tubes 120 and 130 to be sealed, and the C type is formed at the outer diameter of the first outer tube 120 located at the rear of the outer tube 120 and 130 in the entry direction. Forming a hole penetrating the tube tube 110 to form a grout injection hole 140 for filling the grout material 20 therein, the C-type tube tube 110 of the opposite end where the grout injection hole 140 is formed In the outer diameter, when the internal filling pressure of the grout is more than the allowable range, the pressure relief processing unit 150 is formed to be broken to form, The pressure relief processing unit 150 to process a groove having a predetermined depth on the outer surface of the C-type tube tube 110 in a linear manner, to form a transverse processing line 151 in the circumferential direction, the transverse processing line 151 Rock bolts for reinforcing rock fracture stool, characterized in that to form a longitudinal cutting line 153 respectively extending from both ends of the second outer tube (130) toward. It is made of C-type tube tube 110, both ends of the C-type tube tube 110 is constrained by the axial coupling of the first and second outer tube 120, 130 of each of the band shape and of both ends It is welded between the inlet and the first and second outer tubes 120 and 130 to be sealed, and the C type is formed at the outer diameter of the first outer tube 120 located at the rear of the outer tube 120 and 130 in the entry direction. Forming a hole penetrating the tube tube 110 to form a grout injection hole 140 for filling the grout material 20 therein, the C-type tube tube 110 of the opposite end where the grout injection hole 140 is formed In the outer diameter, when the internal filling pressure of the grout is more than the allowable range, the pressure relief processing unit 150 is formed to be broken to form, The pressure relief processing unit 150 to process a groove having a predetermined depth on the outer surface of the C-type tube tube 110 in a linear manner, to form a transverse processing line 151 in the circumferential direction, the transverse processing line 151 Rock bolts for reinforcing rock fracture stool, characterized in that to form a longitudinal cutting line 153 extending from the one end of both sides toward the second outer tube (130). It is made of C-type tube tube 110, both ends of the C-type tube tube 110 is constrained by the axial coupling of the first and second outer tube 120, 130 of each of the band shape and of both ends It is welded between the inlet and the first and second outer tubes 120 and 130 to be sealed, and the C type is formed at the outer diameter of the first outer tube 120 located at the rear of the outer tube 120 and 130 in the entry direction. Forming a hole penetrating the tube tube 110 to form a grout injection hole 140 for filling the grout material 20 therein, the C-type tube tube 110 of the opposite end where the grout injection hole 140 is formed In the outer diameter, when the internal filling pressure of the grout is more than the allowable range, the pressure relief processing unit 150 is formed to be broken to form, The pressure relief processing unit 150 to process a groove having a predetermined depth on the outer surface of the C-type tube tube 110 in a linear manner, to form a transverse processing line 151 in the circumferential direction, the transverse processing line 151 Rock bolt for reinforcing rock crushing section characterized in that it forms a longitudinal cutting line 153 extending from the center of the second outer tube (130) toward. It is made of C-type tube tube 110, both ends of the C-type tube tube 110 is constrained by the axial coupling of the first and second outer tube 120, 130 of each of the band shape and of both ends It is welded between the inlet and the first and second outer tubes 120 and 130 to be sealed, and the C type is formed at the outer diameter of the first outer tube 120 located at the rear of the outer tube 120 and 130 in the entry direction. Forming a hole penetrating the tube tube 110 to form a grout injection hole 140 for filling the grout material 20 therein, the C-type tube tube 110 of the opposite end where the grout injection hole 140 is formed In the outer diameter, when the internal filling pressure of the grout is more than the allowable range, the pressure relief processing unit 150 is formed to be processed to break, The pressure relief processing unit 150 is a rock bolt for reinforcing rock fracture stool characterized in that the surface processing to have a predetermined depth on the outer surface of the C-type tube tube (110). delete The method according to any one of claims 2 to 5, The C-type tube tube is iron (Fe) 98.28 ~ 99.25% by weight, carbon (C) 0.10 ~ 0.30% by weight, silicon (Si) 0.2 ~ 0.5% by weight, manganese (Mn) 0.4 ~ 0.8% by weight, phosphorus (P) Rock bolt for reinforcing rock crushing cod, characterized in that consisting of carbon steel pipe mixed with 0.02 ~ 0.06% by weight, sulfur (S) 0.02 ~ 0.06% by weight. delete It is made of C-type tube tube 110, both ends of the C-type tube tube 110 is constrained by the axial coupling of the first and second outer tube 120, 130 of each of the band shape and of both ends It is welded between the inlet and the first and second outer tubes 120 and 130 to be sealed, and the C type is formed at the outer diameter of the first outer tube 120 located at the rear of the outer tube 120 and 130 in the entry direction. Forming a hole penetrating the tube tube 110 to form a grout injection hole 140 for filling the grout material 20 therein, the C-type tube tube 110 of the opposite end where the grout injection hole 140 is formed In the outer diameter, when the internal filling pressure of the grout is more than the allowable range, the pressure relief processing unit 150 is formed to be processed to break, The pressure relief processing unit 150 is a rock bolt for reinforcing rock fracture stool characterized in that at the same time to form a large number around the outer diameter of the C-type tube tube (110). Drilling a construction hole 11 in the ground; Mounting the rock bolt (100) according to any one of claims 2 to 5 and 9 to the construction hole (11); Connecting the first outer tube 120 of the rock bolt 100 to the adapter 160 of the filling device, and filling the grout material 20 through the grout inlet 140; The C-type tube pipe 110 of the rock bolt 100 is expanded by the filling pressure of the grout material 20 to be in close contact with the inner wall of the construction hole 11; Supplying the filling pressure of the grout material 20 in excess so that the pressure relief processing part 150 of the rock bolt 100 is broken; And The grout material 20 discharged through the pressure relief processing unit 150 broken by maintaining the filling pressure of the grout material 20 fills the gap between the rock bolt 100 and the construction hole 11 and at the same time. Penetrating into the gap so that the grout root 21 is formed; Rock crushing cod reinforcement method using a rock bolt comprising a. The method of claim 10, Rock fracture crushing section using a rock bolt, characterized in that when the pressure-discharge processing unit 150 is broken, the incision surface is expanded to the outside of the C-type tube tube 110 to form a separation prevention protrusion 157 fixed to the ground. Reinforcement method.

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