KR101290010B1 - Explosion volume inflation type lock bolt and construction method using the same - Google Patents

Abstract

Provides explosion-expandable rock bolts.
The present invention is a rock bolt is inserted into a fixed hole drilled in a predetermined depth in the construction surface, the explosive part is filled in the internal space to a certain amount of explosives to generate an explosive force when the power is applied; The inlet to which the explosion part is inserted is formed at one end, and the other end is provided with an arrangement hole inside the body having a certain length, and when the explosion of the explosion portion inserted into the arrangement hole in the inside of the drilling hole Metal tube that expands and expands in volume: penetrates through the first outlet hole through which the other end of the positive and negative terminal cables electrically connected at one end of the explosion unit is drawn out and is screwed with the female thread formed at the inlet to seal the inlet. A second sealing part which is formed through the first sealing part and a pair of second drawing holes through which the positive and negative terminal cables are respectively drawn out, and is assembled at an end of the first sealing part to cover and seal the first drawing hole; .

Description

Explosion Volume Inflatiopn Type Lock Bolt and Construction Method uisng the Same}

The present invention relates to a rock bolt in which the volume is expanded by the explosive force and a construction method for reinforcing the same by using the same, and more specifically, the volume and the outer diameter are artificially expanded and expanded by the explosive force of the initiator in the state of being inserted into the drilling hole. The present invention relates to an explosive volume expansion type rock bolt capable of shortening the construction period by obtaining sufficient basic fixing force, and easy installation and construction, and a construction method using the same.

In general, rock bolts are a kind of geotechnical method such as underground structures, tunnels, or bolts or roof bolts used therein.

The rock bolt is constructed in such a way that a drilling device is drilled to have a drilling hole having a diameter of approximately 36 to 40 mm and a depth of 2 m or more on a construction surface such as a rock or soil around a tunnel, and is fixed in the hole.

1 is a block diagram showing a lock bolt according to the prior art, a conventional lock bolt is shown in Figure 1, the bolt member 10 of a predetermined length to be fitted into the drilled hole drilled in a predetermined depth in the construction surface and , The bolt member 10 is composed of a fixing plate 11 and a fixing nut 12 for finishing.

There are two ways to construct such rock bolts. One is when the rock on the direct ceiling, which is easy to separate, is strong, and the rock is hung on the rock directly. It is a combination of easy-to-finish layers of rock to create a beam or purlin to support anti-pressure.

Based on these two principles, the method of bonding the rock bolt to the rock includes a front end bonding method and a front side bonding method.

Based on the bonding method, the two methods are commonly divided into mechanical (wedge), resin and mortar types, and rock bolts can be used in various ways such as thickness and length depending on the condition of the rock. have.

Such rock bolts form perforations in the ground including mountain rocks in civil construction, especially tunnel construction.

At this time, a predetermined number of explosives, for example, dynamite, are exploded in the perforated hole to break the rock and widen the foundation hole of the tunnel, and then drill the foundation tunnel at a constant height and width. In order to prevent the collapse of the foundation tunnel to put a myriad of rock bolts (foundation bolts), mesh-shaped mesh is installed, and the concrete is finally poured to perform the reinforcement film construction.

This reinforcing film construction is to first drill a hole for rock bolts to be inserted into the rock by using a rock drill or a crusher, and then cast cement mortar in the hole and insert the rock bolt or the rock bolt, and then cement cement mortar. When the cement mortar that is poured is completely hardened, the rock bolt is firmly fixed in the rock.

Here, by installing a plurality of conventional lock bolts at predetermined intervals, it will be able to withstand the concrete load sprayed on the mesh body while maintaining a fixed state firmly.

However, since the conventional rock bolt has a basic force by a fixing force fixed by the hardening of cement mortar, which is cast first or later in the drilling hole drilled on the construction base surface, the fixing force when the cement mortar hardening does not have sufficient strength In addition to this can lead to poor construction, if the curing time is slow, the construction cost acted as a factor.

In addition, since the process of pouring cement mortar into a drilled hole formed on the foundation surface of the foundation is required separately, the entire process is complicated and acts as a factor for prolonging the construction period.

(Patent Document 1) KR2007-0026740 A

(Patent Document 2) KR2007-0026741 A

The present invention is to solve the problems as described above, the object is to artificially expand and expand the volume and outer diameter by the explosive force of the initiator in the state of being placed inside the drilling hole can obtain a sufficient basic fixing force, installation And it is to provide an explosive volume expansion type rock bolt and a construction method using the same, which can shorten the construction period by easy construction.

As a specific means for achieving the above object, the present invention, in the lock bolt is inserted into a fixed hole drilled in a predetermined depth on the construction surface, a certain amount of explosive agent to explode when the power is applied to generate an explosive force in the internal space Filled explosion; The inlet to which the explosion part is inserted is formed at one end, and the other end is provided with an arrangement hole inside the body having a certain length, and when the explosion of the explosion portion inserted into the arrangement hole in the inside of the drilling hole Metal tube that expands and expands in volume: penetrates through the first outlet hole through which the other end of the positive and negative terminal cables electrically connected at one end of the explosion unit is drawn out and is screwed with the female thread formed at the inlet to seal the inlet. A second sealing part which is formed through the first sealing part and a pair of second drawing holes through which the positive and negative terminal cables are respectively drawn out, and is assembled at an end of the first sealing part to cover and seal the first drawing hole; It provides an explosive volume expansion type rock bolt, characterized in that it comprises a.

Preferably, the metal tube is provided on the outer surface of the corrugated cross section at regular intervals in the circumferential direction so as to expand the outer surface area during the volume expansion caused by the explosion of the explosion portion.

Preferably, the placement hole is provided with an inner wrinkled portion on the corrugated cross section at regular intervals in the circumferential direction on the inner surface so as to expand the outer surface area during the volume expansion caused by the explosion of the explosive portion.

Preferably, the second sealing part penetrates a pair of assembling holes corresponding to the pair of fastening holes formed on both left and right sides of the first drawing hole, respectively, so that the first pair of fastening members are fastened to the fastening holes through the assembly holes. It is integrally combined with the seal.

More preferably, the second sealing part is assembled to the placement groove recessed to a certain depth so as to form the pair of fastening holes on the bottom surface.

Preferably, the metal tube has a connecting flange having an outer diameter extended at an end thereof, and the connecting flange can be formed on an outer surface of the connecting flange so as to fix a fixing plate attached to a construction surface on which the drilling hole is perforated. It is provided with a ring-shaped fixing flange which is in contact with the fixing plate by having a female screw portion screwed with the screw portion.

Preferably, the metal tube body is provided with a hollow cylinder cylinder fixture interposed between the inner surface of the inlet of the drilling hole and the outer surface of the metal tube.

In addition, the present invention is a method for constructing a rock bolt to reinforce the construction surface, the step of drilling to form a drilling hole of a predetermined depth in the construction surface; A metal tube having an explosive part filled in the inner space and inserted into the placement hole, and a first drawing hole through which the positive and negative terminal cables electrically connected to the explosion portion are drawn out so as to seal the inlet of the placement hole; Preparing a lock bolt including a first sealing part and a second sealing part assembled with a first sealing part to cover and seal the first drawing hole with a pair of second drawing holes through which the positive and negative terminal cables are drawn out, respectively. step ; Temporarily fixing the lock bolt by placing the hole in the drilling hole; Expanding the volume of the metal tube such that the outer surface is tightly fixed in the drilling hole by the explosive force of the explosive part exploded when the power is applied through the positive and negative terminal cables; It provides a construction method using an explosion-expansion-type rock bolt, characterized in that it comprises a.

Preferably, the step of temporarily fixing the lock bolt is made by a hollow cylinder-shaped fixture is disposed between the outer tube of the metal tube and the inner surface of the drilling hole.

Preferably, the step of temporarily fixing the lock bolt further comprises a step of attaching a fixing plate to the construction surface by a fixing flange coupled to the connection flange formed at the end of the metal tube to securely close.

The present invention as described above has the following effects.

(1) Since the explosive force is generated by inserting power into the explosive part embedded in the metal tube after being inserted into the drilled hole drilled on the construction surface, the volume of the metal tube disposed in the perforated hole can be expanded by the explosive force. It is possible to secure sufficient foundation fixing force by increasing the fixing force of the tube.

(2) The process of inserting the rock bolt into the construction surface by inserting and placing the rock bolt in the drilling hole drilled on the construction surface is simple and simple, and the additional process of casting cement mortar becomes unnecessary. The construction period can be shortened and the cost of construction can be reduced.

1 is a block diagram showing a lock bolt according to the prior art.
Figure 2 is an overall assembly view showing an explosive volume expansion type rock bolt according to a preferred embodiment of the present invention.
Figure 3 is an exploded perspective view showing an explosive volume expansion type rock bolt according to a preferred embodiment of the present invention.
Figure 4 is a construction cross-sectional view showing an explosion-expansion-type rock bolt according to a preferred embodiment of the present invention.
5 is a sectional view taken along line AA in Fig.
6a to 6c is a construction flowchart using an explosive volume expansion type rock bolt according to a preferred embodiment of the present invention.

The objects, features and advantages of the present invention described above will become more apparent from the following detailed description. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Explosion volume expansion type rock bolt 100 according to a preferred embodiment of the present invention, as shown in Figures 2 to 5, occurs when the explosives are exploded in a state of being inserted into a drilled hole drilled in a predetermined depth on the construction surface It includes an explosive part 110, a metal tube 120, the first and second sealing parts 130, 140 so as to secure a fixed force that is expanded by the explosive force to be firmly fixed to the construction surface.

The explosion unit 110 is filled with a predetermined amount of explosives in the inner space to explode when the power is applied to generate an explosion force.

The explosive unit 110 is a hollow cylinder cartridge 111 having a predetermined size of the inner space so that the explosive agent 119 such as chemicals or dynamite is filled, and a sealing member for sealing the open inlet of the cartridge 111 ( One end of the detonator 113 and the detonator 113 inserted into the explosive agent 119 through the 112 and the other end of the detonator 119 are electrically connected to the other end of the detonator 119. It includes a positive and negative terminal cable (114, a, 114b) for applying power to the detonator 113 to the explosion.

In this case, the explosive 119 filled in the cartridge 111 rapidly discharges a current to the metal oxide causing an oxidation reaction instead of the explosives or dynamite, thereby expanding the medium in the process of oxidizing the electrolyte and the metal oxide contained in the cartridge. And 'expanded metal mixture' to be exothermic may be selectively employed and used. Detailed technical details of the 'expanded metal mixture' are disclosed in Korean Patent Publication No. 213577 or Korean Patent Publication No. 2003-0006083. It is.

In other words, the metal expanded as a oxidizing agent, the metal powder is increased in volume by an exothermic reaction while being oxidized by the metal salt, and the reaction accelerator for promoting the oxidation reaction of the metal salt and the metal powder and the like to form a rapidly expanding metal mixture.

Such metal salts include iron nitrate {Fe (NO3) 3}, copper nitrate {Cu (NO3) 2}, barium nitrate {Ba (NO 3) 4}, manganese nitrate {Mn (NO3) 4}, magnesium nitrate {Mg ( NO3)}, nitrates such as potassium nitrate {KNO3}, sodium nitrate {NaNO3}, calcium nitrate {Ca (NO3) 2}, ferric trioxide (Fe2O3), triiron tetraoxide (Fe2O4), copper oxide (CuO), manganese dioxide Metal oxides such as (MnO 2), nickel trioxide (Ni 2 O 3), and lead oxide (PbO) may be used, and the metal powder may be aluminum (Al) sodium (Na), potassium (K), lithium (Li), magnesium ( Reducing agents such as Mg), calcium (Ca), manganese (Mn), barium (Ba), chromium (Cr), silicon (Si) and the like may be used.

The oxidation promoter may be sodium sulfate (NaSO 4), magnesium sulfate (MgSO 4), iron sulfate (FeSO 4), manganese sulfate (MgSO 4), nickel sulfate (NiSO 4), calcium sulfate (CaSO 4), or the like. As an electric spark induction electrolyte for promoting the oxidation reaction of the powder, a liquid in which a small amount of ammonium borate, nitrate, sulfate, and the like is dissolved in glycerine and alcohols such as ethylene glycol and the like can be used.

The metal tube 120 is formed of a tube body in which the body volume is expanded to generate a fixed force by expanding the outer diameter of the body in the perforation hole drilled on the construction surface by the explosive force generated when the explosion unit 110 is exploded.

The metal tube 120 is formed to penetrate the inlet 121 to one end so that the explosion unit 110 can be inserted, the other end is provided with a mounting hole 122 in which the other end is sealed in the body (120a) long do.

Here, the metal tube 120 is provided with an outer pleat portion 125 having a corrugated cross section on the outer surface at regular intervals in a circumferential direction so that the outer surface area can be enlarged during the volume expansion caused by the explosion of the explosion portion 110. desirable.

At the same time, the arrangement hole 122 into which the explosion unit 110 is placed is also disposed inside the corrugation unit 126 having a corrugated cross section on the inner surface so as to expand the external surface area during the volume expansion caused by the explosion of the explosion unit 110. ) Is preferably provided at regular intervals in the circumferential direction.

Accordingly, the outer surface of the metal tube 120 and the inner surface of the placement hole 122 are formed by the inner and outer corrugations 125 and 126 on the corrugated cross section. The grooves are formed to have a plurality of grooves and grooves in parallel with the placement holes in the direction, and the inner and outer corrugations 125 and 126 may be expanded by the explosive force of the explosive portion to enable volume expansion without destroying the metal tube 120. .

 In addition, the inner and outer surfaces of the metal tube can be expanded to be radially expanded in the radial direction by the explosive force of the explosive portion, so that the metal tube can be firmly fixed to the inner surface of the drilling hole without additional cement mortar.

The explosive force of the explosive part may control the amount of explosive agent used in accordance with the tensile strength according to the material of the metal tubular body so as to prevent construction failure such as breakage or bursting of the metal tubular body in the drilling hole during construction.

The first sealing part 130 is formed of a metal cylinder 131 to seal the inlet of the placement hole 122 is inserted into the explosion portion.

The metal cylindrical body 131 penetrates through the first drawing hole 132 through which the other ends of the positive and negative terminal cables 114a and 114b electrically connected at one end to the explosion unit 110 at the center of the body are simultaneously drawn out. A male screw portion 134 is provided at the end to be assembled by screwing with the female screw portion 121a formed at the inlet 121.

Accordingly, the anode and cathode terminal cables 114a and 114b exposed to the outside from the placement hole of the metal tube 120 while the detonator 113 is inserted into the explosive agent 119 of the explosion unit 110 are The outside is drawn out through the first drawing hole 132 formed through the center of the body of the metal cylindrical body 131, and the anode and cathode terminal cables 114a and 114b are drawn out through the first drawing hole 132. Between the metal tube body 120 and the metal cylinder body 131 by screwing the male screw portion 134 formed at the end of the metal cylindrical body 131 and the female screw portion 121a formed at the inlet 121 in the closed state. The bond is made.

The second sealing part 140 includes a plate body 141 assembled to an end of the first sealing part 130 so as to cover and seal the first drawing hole 132 formed through the metal cylinder 131.

The plate body 141 penetrates through the pair of second drawing holes 142a and 142b so that the positive and negative terminal cables 114a and 114b simultaneously drawn out through the first drawing hole 132 may be guided out. It can be made of a substantially disk-like metal or plastic material.

In addition, the plate body 141 penetrates the pair of fastening holes 133 and the pair of assembling holes 143 corresponding to the left and right sides of the first outlet hole 132, respectively, to be fastened to the fastening holes through the assembly holes. It is preferable to be integrally coupled with the first sealing part 130 by a pair of fastening members 145.

Here, the plate body 141 is assembled to the placement groove 136 recessed to a predetermined depth so that the pair of fastening holes 133 are formed on the bottom surface in order not to protrude from the end of the first sealing part 130. It is preferable.

On the other hand, at the end of the metal tube 120 corresponding to the inlet 121 is provided with a connecting flange 127 of the outer diameter is extended, the connection flange 127 in the construction surface on which the drilling hole (H) is perforated A ring-shaped fixing flange closely attached to the fixing plate is provided with a female screw portion 128a coupled to the male screw portion 127a formed on the outer surface of the connecting flange 127 so as to fix the fixing plate F attached thereto. And (128).

In addition, the metal tube 120 has an inner surface of the inlet of the hole H and the metal tube to prevent separation of the metal tube 120 from the hole H formed in the ceiling surface during the tunnel construction. It is to provide a hollow park cylinder fixture 129 interposed between the outer surface of the 120.

Accordingly, the fixing plate (F) attached to the construction surface on which the drilling hole (H) is formed can be firmly fixed by the fixing flange 128 screwed to the connection flange of the metal tube 120. The explosion of the explosive portion by the metal tube 120 inserted into the hole of the drilling hole H by the hollow-cylinder cylinder fixing body 129 interposed between the drilling hole H and the metal tube 120 by its own weight. It is possible to prevent the construction failure to be drawn out before the volume expansion by.

In the process of constructing the explosion-expanded rock bolt having the above-described configuration, first, as shown in FIG. 6A, a perforated hole H having a predetermined depth is formed in a construction surface such as a rock portion or an inclined surface of the tunnel using a perforator. Perforate.

Then, the explosion unit 110 is inserted into the placement hole 122, the explosion unit 110 through the first drawing hole of the first sealing unit 130 is assembled to seal the inlet of the placement hole 122 A second having a pair of outlet holes 142a and 142b with which the positive and negative terminal cables 114a and 114b electrically connected to each other are simultaneously drawn out and the drawn negative and positive terminal cables 114a and 114b are respectively externally drawn out. After preparing the explosive volume expansion type lock bolt 100 in which the sealing part 140 is assembled at the end of the first sealing part 130, as shown in FIG. 6B, the second sealing part 140 is exposed to the outside. The explosive volume expansion type lock bolt 100 is assembled and prepared to be inserted into the drilling hole (H) and temporarily fixed.

At this time, the outer pleated portion on the corrugated cross-section on the outer surface to increase the friction force between the explosion-expandable rock bolt 100 and the drilling hole (H) inserted into the drilling hole to prevent separation of the temporarily fixed rock bolt It is desirable to temporarily fix the hollow tube cylindrical fixture 129 between the metal tube 120 and the inner surface of the drilling hole (H).

Here, the explosive volume expansion type rock bolt 100 is shown and described as being constructed in a drilled hole that is drilled to a certain depth to reinforce the ceiling surface of the tunnel construction site, but is not limited to this to reinforce the inclined construction surface In order to be drilled to a certain depth may be installed in the hole.

In addition, the lock bolt 100 may be temporarily fixed to the drilling hole (H), and then the fixing plate (F) may be attached to the construction surface to closely fix the lock bolt 100, which may be an end of the metal tube 120. It may be made by a fixed flange 128 screwed to the connection flange 127 formed in.

Subsequently, a power supply unit electrically connected to the positive and negative terminal cables 114a and 114b externally drawn out through a pair of second drawing holes 142a and 142b provided in the plate body 141 of the second sealing unit 140, respectively. When the current is supplied to the detonator 113 through the 115, the detonator is discharged to form a plasma channel, and the explosive agent embedded in the cartridge 111 is exploded by the high heat and shock wave energy generated in the plasma channel. will be.

Accordingly, as shown in FIG. 6C, the metal tube body 120 has an external corrugation portion 125 having a corrugated cross section formed on an outer surface of the metal tube body 120 by an explosive force generated when an explosive agent is exploded, As the inner pleats 126 formed on the inner surface of the placement hole 122 is unfolded, the volume expansion is made to expand the outer diameter in the radial direction, thereby increasing the adhesion between the drilling hole and the metal tube inserted into the foundation. It can increase the fixing force.

In this case, the inlet of the metal tube 120 is sealed by the metal cylinder 131 of the first sealing part 130 and the plate body 141 of the second sealing part 140 to be continuously assembled to the The flame generated during the explosion of the explosion unit 110 is not ejected to the outside can be used safely.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

110: explosion portion 111: cartridge
112: sealing member 113: detonator
114a, 114b: positive and negative terminals 115: power supply
120: metal tube 121: inlet
122: arrangement hole 125,126: inner and outer wrinkles
127: connection flange 128: fixed flange
130: first sealing part 131: metal cylindrical body
132: first withdrawal hole 133: fastener
140: second sealing part 141: plate body
142a, 142b: second drawing hole 143: assembly

Claims (10)

In the rock bolt is inserted into a fixed hole drilled in a certain depth on the construction surface,
An explosive part in which a certain amount of explosive is filled in the inner space to explode and generate explosive power when the power is applied;
The inlet to which the explosion part is inserted is formed at one end, and the other end is provided with an arrangement hole inside the body having a certain length, and when the explosion of the explosion portion inserted into the arrangement hole in the inside of the drilling hole Metal tube that expands and expands in volume:
A first seal for sealing the inlet by providing a metal cylindrical body screwed with the female thread formed in the inlet through the first outlet hole through which the other end of the positive and negative terminal cables electrically connected to the explosion part is drawn out; Wealth and
A second sealing part formed through the pair of second drawing holes through which the positive and negative terminal cables are drawn out, and assembled at an end of the first sealing part to cover and seal the first drawing hole; Lt; / RTI >
The second sealing part is integrally formed with the metal cylindrical body by a pair of fastening members fastened to the fastening holes through the assembly holes, respectively, through the pair of fastening holes formed on the left and right sides of the first drawing hole and a pair of fastening holes corresponding to the fastening holes. It includes a plate body coupled to,
The plate body is assembled to a placement groove formed in a predetermined depth recessed in the upper end of the metal cylinder to form the pair of fastening holes on the bottom surface,
The metal tube has a connecting flange having an outer diameter extended at an end thereof, and the connecting flange has a male screw portion and a screw formed on an outer surface of the connecting flange to fix a fixing plate attached to a construction surface on which the drilling hole is drilled. Explosion volume expansion type lock bolt, characterized in that it comprises a ring-shaped fixing flange in contact with the fixing plate having a female screw portion to be coupled. The method of claim 1,
The metal tube is explosive volume expansion type rock bolt, characterized in that the outer surface is provided with a predetermined period in the circumferential direction to the outer surface irregularities on the corrugated cross section on the outer surface to expand the external surface area when the explosion by the explosion. The method of claim 1,
The arrangement hole has an explosion volume expansion type rock bolt, characterized in that the inner surface is provided with a predetermined period in the circumferential direction on the inner surface in the circumferential direction so as to expand the external surface area during the volume expansion by the explosion of the explosion. delete delete delete The method of claim 1,
The metal tubular body has an explosion-expanded expansion-type rock bolt, characterized in that it comprises a hollow cylinder cylinder holding body interposed between the inlet inner surface of the drilling hole and the outer surface of the metal tube. delete delete delete

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