KR102110333B1 - Bumpy hole extention bits assembly and rock bolt construction method using bumpy hole - Google Patents

Abstract

The present invention relates to a method of constructing a rock bolt using an uneven groove expansion bit assembly and an uneven groove, specifically, a bit assembly to form an uneven groove by selectively expanding the side surface of a drilling hole after excavation of the ground and a lock using the same It relates to a bolt construction method. The present invention is a bit assembly that is fastened to a hammer having a piston that moves up and down, a body part that moves up and down by a piston, a guide part that is formed in an inclined direction from the bottom of the body part, and a slide that moves along the guide part by moving the body part. The housing includes a bit, a body portion, and an expansion hole, and an opening that protrudes when the expansion bit slides.

Description

Bit bolt assembly for uneven groove expansion and lock bolt construction method using uneven groove {BUMPY HOLE EXTENTION BITS ASSEMBLY AND ROCK BOLT CONSTRUCTION METHOD USING BUMPY HOLE}

The present invention relates to a method of constructing a rock bolt using an uneven groove expansion bit assembly and an uneven groove, specifically, a bit assembly to form an uneven groove by selectively expanding the side surface of a drilling hole after excavation of the ground and a lock bolt using the same It is related to the construction method.

In order to reinforce the ground, in general, the ground is drilled, a rock bolt is inserted into the drilled hole, and then a grout such as resin or mortar is injected into the hole and cured, and then the plate is fixed to the top of the lock bolt to reinforce the ground. Is used.

In the case of reinforcing the ground using this technique, since the constant axial force is maintained at the beginning of construction of the lock bolt, it shows the effect of reinforcing the ground, but after a certain period of time, cracks in the grout cured according to drying shrinkage, temperature change, humidity change, etc. This occurs, which leads to a reduction in the axial force of the lock bolt, which in turn reduces the effectiveness of the ground reinforcement.

In order to minimize the reduction of the effect of the reinforcement of the ground, it is effective to form a plurality of uneven grooves in the middle of the holes drilled when drilling the ground and inject grout into the whole of the drilling holes including the uneven grooves to cure.

In order to form a concave-convex groove in the drilling hole, 'borehole drilling device having an in-line extension wing and its driving method' (Republic of Korea Patent Publication No. 10-0685386), 'Drill for drilling the ground by which the drilling diameter can be expanded step by step' ( Republic of Korea Patent Publication No. 10-2013-0057161) has been disclosed. The technology disclosed in these patents has the advantage of installing the inner shaft, protruding the bit according to the installation direction of the shaft, and rotating the entire device to expand, but has the advantage of performing drilling and expansion. Since a considerable load is applied to the bit for forming the groove, there is a problem that the bit does not protrude properly, and the rotation does not occur smoothly.

In addition, since the groove is formed by rotation, it can be used only in a layer having weak ground strength, such as soil and weathering, and there is a problem in that it is difficult to use in hard ground having strong ground strength such as rock.

Republic of Korea Registered Patent Publication No. 10-0685386 (released on May 19, 2006) Republic of Korea Patent Publication No. 10-2013-0057161 (2013. 05. 31 published)

An object of the present invention is to provide a method for constructing a rock bolt using a bit assembly and an uneven groove capable of forming an uneven groove in a drilling hole of a ground having strong strength using impact energy generated by a blow of a piston.

In order to achieve the above object, the bit assembly for uneven groove expansion according to an embodiment of the present invention is a bit assembly that is fastened to a hammer having a piston that moves up and down and is inclined from the lower portion of the body portion that moves up and down by the piston. It includes a guide portion formed in the direction, a hole for sliding the slide along the guide by the movement of the body portion, a housing for receiving the body portion and the hole for expansion, and an opening protruding when the slide of the hole moves.

According to another embodiment of the present invention, the expansion bit of the bit assembly for uneven groove expansion is formed on one side of the movement guider installed on the guide portion, the movement guider, the projection protrusion projecting from the opening, and on the other side of the movement guider. , When the protruding protrusion is protruding, it is preferable to include a locking portion contacting the edge of the opening.

It is preferable that the protruding bit of the bit assembly for uneven groove expansion according to another embodiment of the present invention further includes a protruding tip formed by protruding a portion of the protruding protrusion relative to the rest.

It is preferable that the bit assembly for uneven groove expansion according to another embodiment of the present invention is disposed at the lower portion of the body portion, is deformed when the body portion moves downward, and includes an elastic portion that moves the body portion upward when restoring.

According to another embodiment of the present invention, a bit assembly for expanding an uneven groove has a wide upper portion and a lower portion having a narrow cross-section, and a guide portion formed on the inclined portion, and elastic between the body portion and the elastic portion. It is preferable that the transmission part is disposed, and the elastic transfer part has a narrow cross section and a lower cross section so as to contact the inclined part and the elastic part.

In the lower portion of the housing of the bit assembly for uneven groove expansion according to another embodiment of the present invention, a cover for accommodating an elastic transmission portion and an elastic portion is combined, and the cover is formed to be narrow in the lower direction and a cylindrically shaped extension in the lower direction. It is preferably composed of a supporting portion for supporting the portion.

In addition, the method for constructing a lock bolt using an uneven groove according to an embodiment of the present invention includes forming a drilling hole, forming an uneven groove in the drilling hole, and inserting a rock bolt into the drilling hole.

In the step of forming the uneven groove in the hole of the rock bolt construction method using the uneven groove according to another embodiment of the present invention, when the downward movement of the body portion, the expansion bit protrudes out of the housing through the opening and uneven around the hole A groove is formed, and when the body part moves upward, a hole for expansion is inserted into the housing through the opening.

According to another embodiment of the present invention, a method for constructing a lock bolt using an uneven groove is formed between a step of forming an uneven groove and a step of inserting a rock bolt, or after inserting a lock bolt, a grout in the hole and uneven groove ) Is further included, and after the step of inserting the lock bolt, the step of fastening the lock bolt is further included.

According to the present invention, the method for constructing a rock bolt using an uneven groove expansion bit assembly and an uneven groove can form and extend the uneven groove by only hitting the piston as the kinetic energy of the piston is transmitted from the body to the expansion bit.

In addition, since the movement direction of the expansion bit can be changed perpendicular to the movement direction of the body portion, the uneven groove can be formed and extended even on a hard ground unlike the conventional rotation method.

In addition, since the kinetic energy of the piston can be concentrated on the protruding tip formed in the expansion bit, uneven groove formation can be smoothly performed, and the initial load of the driving unit can be reduced.

In addition, since the outer surface of the cover moves along the perforation hole, there is an effect of preventing meander expansion.

1 is a view showing a state in which the uneven groove expansion bit assembly according to an embodiment of the present invention is installed in the driving unit.
2 and 3 are a front view and an exploded perspective view of the bit assembly for uneven groove expansion sequentially shown in FIG. 1.
FIG. 4 is an AA section view illustrated in FIG. 2.
5 is a perspective view of the body portion shown in FIG. 3.
FIG. 6 is a plan view of the bit assembly for expanding an uneven groove shown in FIG. 1.
7A to 7C are operating state diagrams of the bit assembly for uneven groove extension shown in FIG. 1.
8 is a bottom view of the cover, elastic portion, and elastic transfer portion removed from the bit assembly for uneven groove expansion shown in FIG. 7B.
9 is a flowchart of a method for constructing a lock bolt using a bit assembly for expanding an uneven groove shown in FIG. 1.
10 is a flowchart illustrating the steps of forming the uneven groove shown in FIG. 9.

In order to describe in detail that a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention, the most preferred embodiment of the present invention will be described with reference to the accompanying drawings.

First, it should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings.

In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

In the direction expressed in the contents described below prior to the detailed description of the present invention, the upper side of the "upper part" is the direction toward the housing 140 side with respect to the cover 170 shown in FIG. 2, and the "lower part" Below is defined as the direction toward the cover 170 with respect to the housing 140.

Hereinafter, a bit assembly for uneven groove expansion according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

1 is a view showing a state in which the uneven groove expansion bit assembly according to an embodiment of the present invention is installed in the driving unit.

Referring to Figure 1, the uneven groove expansion bit assembly (100, hereinafter referred to as 'bit assembly') is installed on the end of the drive unit 10, such as a hammer that uses a fluid as a power source, such as air pressure, to the ground as described above It is a device for expanding by forming an uneven groove around the formed hole.

2 and 3 are a front view and an exploded perspective view of the bit assembly for uneven groove expansion sequentially shown in FIG. 1.

And Figure 4 is an A-A section view shown in Figure 2, Figure 5 is a perspective view of the body portion shown in Figure 3;

The bit assembly 100 is fastened to a hammer having a piston 11 that moves up and down (shown in FIG. 1), and referring to FIGS. 2 to 5, the body portion 110 that moves up and down by the piston 11 ), A guide portion 120 formed in an oblique direction from the lower portion of the body portion 110.

In addition, the bit assembly 100 accommodates the expansion bit 130, the body portion 110 and the expansion bit 130 that slide along the guide portion 120 by the movement of the body portion 110, , A housing 140 in which an opening 141 protruding when the slide of the expansion bit 130 is moved is formed.

More specifically, the body portion 110 is a cylindrical shape in which a hollow is formed and communicated up and down inside, and a main bit installed at a lower portion of the driving portion 10 or a lower portion of the body portion 110 is a lower portion of the drilling hole. In the case of drilling in close contact with the ground, the piston 11 strikes the body portion 110 and generates kinetic energy in which the body portion 110 moves downward by the impact energy generated therefrom.

In addition, kinetic energy in which the body portion 110 moves upward is generated by the repulsive force generated by the main bit hitting the ground, and the body portion 110 hits the piston 11 and generates impact energy. As a result, kinetic energy in which the piston 11 moves upward is generated.

The guide portion 120 switches the movement direction of the expansion bit 130 with respect to the movement direction of the body portion 110 to protrude the expansion bit 130 in the radial direction of the body portion 110 It is a composition.

That is, by the movement of the body portion 110, the expansion bit 130 is moved by sliding along the guide portion 120, the expansion bit 130, the radial direction of the body portion 110, specifically The body portion 110 can be shifted vertically or diagonally.

The housing 140 is configured to protect and support the body portion 110 and the expansion bit 130, and is in a cylindrical shape in communication with the top and bottom, and is installed at the end of the driving portion 10 and the body portion ( 110) and the expansion bit 130 are disposed.

The housing 140 and the driving unit 10 may be combined, for example, by a screw coupling method, and a thread 142 that is mutually coupled to the inner or outer circumferential surface of the housing 140 and the driving unit 10 may be formed. .

And as another example, although not shown in the drawing, it can be combined in a fitting manner, and the upper part of the housing 140 is inserted and coupled to the lower part of the driving part 10.

Furthermore, in order to prevent separation by an unspecified external force, it is possible to fix the housing 140 and the driving unit 10 by separately using known fixing members such as bolts and pins.

The housing 140 is formed with an opening 141 for exposing the hole 130 to the outside.

More specifically, the opening 141 is formed to a size through which a portion of the expansion bit 130 passes and protrudes outward, and a plurality of the openings 141 are provided in the housing 140 as many as the number corresponding to the number of the expansion bits 130. ) Is formed spaced apart at regular intervals along the circumference.

The expansion bit 130 includes a movement guide 131 installed on the guide part 120 and a expansion protrusion 133 formed on one side of the movement guide 131 and protruding from the opening 141. .

And it is formed on the other side of the movement guider 131, and includes a locking portion 132 in contact with the edge of the opening 141 when the protruding protrusion 133 protrudes.

The guide part 120 is a protrusion having a 'T' shape in cross section, and the movement guider 131 is a 'U' type groove and is engaged with the guide part 120.

Accordingly, the expansion bit 130 is slided along the guide portion 120.

The protruding protrusion 133 is formed to protrude on one side of the movement guider 131, and supported by the housing 140 in a state fitted to the opening 141 as shown in FIG. 4 at a normal position. do.

That is, the bit assembling 100 can be easily inserted into the perforation hole by arranging the expansion bit 130 in the housing 140 while the expansion protrusion 133 is fitted in the opening 141. have.

Here, when the body portion 110 moves downward, the body portion 110 pushes the expansion bit 130, and the expansion bit 130 slides along the guide portion 120 and simultaneously The protruding projection 133 protrudes from the opening 141 to the outside of the housing 140. (FIG. 8)

Therefore, as the expansion bit 130 protrudes in the radial direction of the body portion 110, an uneven groove is formed and expanded around the perforation hole.

And when the body portion 110 is moved upward, the body portion 110 pulls the expansion bit 130, and the expansion bit 130 slides along the guide portion 120 and simultaneously expands the expansion The projection 133 is returned to the original position in the state fitted to the opening 141.

The protruding bit 130 further includes a protruding tip 134 formed by protruding a portion of the protruding protrusion 133 relative to the rest.

That is, when the protruding protrusion 133 applies an impact around the perforation, the force is distributed when the side of the protruding protrusion 133 is uniformly constant, but when the protruding tip 134 is formed, the protrusion As the force is concentrated on the tip 134, irregular grooves may be formed more smoothly, and further, the initial load of the driving unit 10 may be reduced.

As described above, in the case of drilling in close contact with the ground, kinetic energy is generated in which the body portion 110 and the piston 11 move upward by repulsive force.

However, when the uneven groove is formed in the middle section of the perforated hole, the repulsive force does not occur, so it is difficult to generate kinetic energy for moving the body portion 110 and the piston 11 upward.

To this end, the bit assembly 100 is disposed under the body portion 110, is deformed when the body portion 110 moves downward, and elastic to move the body portion 110 upward when restored. The unit 150 is further included.

More specifically, the elastic portion 150 is configured to move the piston 11 and the body portion 110 moved downward, when the piston 11 and the body portion 110 moves downward, the body The elastic portion 150 is compressed by the upper end of the elastic portion 150 by the portion 110.

In addition, the elastic part 150 is restored by the elastic energy of the elastic part 150 to generate kinetic energy in which the body part 110 moves upward, thereby causing the body part 110 to move upward.

Furthermore, kinetic energy in which the piston 11 moves upward is generated by the impact energy generated by the body portion 110 hitting the piston 11.

Here, the elastic portion 150 is a spring material, such as coil spring, mold spring, compression spring, natural rubber (Natural Rubber), BR (Butadiene Rubber), NBR (Nitrile-butadiene rubber), CR (Chloroprene Rubber), silicone A rubber material such as (silicon) may be used, and further, a known material having excellent rebound resilience, such as the above-mentioned material, may be used, and a known device capable of generating repelling force such as an oil / pneumatic accumulator (accumulator) may be used. Can be.

In addition, the elastic part may be implemented by combining any one or a plurality of the above-described materials and devices, or may be configured in a series or parallel form to adjust the amount of kinetic energy for upward movement of the body part.

Another role of the elastic part 150 is to push the body part 110 to contact the piston 11 when the bit assembly 100 is not selectively performing the expansion operation, so that the expansion bit 130 is provided with a housing ( 140).

In order to constrain the upward movement of the body portion 110, a lower portion of the body portion 110 is formed with an inclined portion 112 having a wide upper portion and a narrow lower portion.

More specifically, the inclined portion 112 is in the form of a cone that communicates with the hollow and decreases in diameter as it goes downward, and the upper end of the inclined portion 112 is caught in the opening 141 as shown in FIG. 4. As the upward movement of the body portion 110 is constrained.

In addition, the guide portion 120 is formed on the inclined portion 112 along the inclined direction of the inclined portion 112, so that the guide portion 120 is inclined from the lower portion of the body portion 110 as described above. Direction.

An elastic transfer unit 160 is disposed between the body portion 110 and the elastic portion 150, and the elastic transfer portion 160 is upper to make contact with the inclined portion 112 and the elastic portion 150 Is narrow and the lower part has a wide cross section.

More specifically, in addition to the function of supporting the body portion 110 and the elastic portion 150, the elastic transfer portion 160 transmits kinetic energy of the body portion 110 to the elastic portion 150, The elastic energy of the elastic part 150 functions as a medium for transmitting the body part 110.

The elastic transfer unit 160 includes a ring-shaped support 161 and a plurality of tip portions 162 inserted into the support 161 along the circumference of the support 161.

That is, as illustrated in FIG. 4, the support 161 is supported at the top of the elastic part 150 in a cylindrical shape, and the tip 162 is a mounting groove formed at a lower surface of the inclined part 112. 113, shown in FIG. 3).

Therefore, the inclined portion 112 having a narrow cross-section is firmly supported by the elastic transfer portion 160 to move the body portion 110 and compress or deform or restore the elastic portion 150, and the body portion 110. Energy transfer between the elastic parts 150 may be smoothly performed.

A cover 170 accommodating the elastic transfer part 160 and the elastic part 150 is coupled to a lower portion of the housing 140.

The cover 170 is composed of a cylindrical portion extending in the downward direction 172 and a support portion 171 formed narrowly in the lower direction to support the elastic portion 150.

The extension portion 172 is coupled to the lower portion of the housing 140, the outer surface of the extension portion 172 is moved in contact with the perforated hole, so there is an effect of preventing meander expansion.

Further, as the lower end of the elastic part 150 is firmly supported by the support part 171, stable deformation of the elastic part 150 may be realized.

In addition, when the lower cover is closed by the support part 171, the elastic transfer part 160, and the elastic part 150 are sequentially connected, when the body part 110 moves downward, the reaction force against it By generating and adding to the elastic energy of the elastic portion 150, the upward movement of the body portion 110 can be made more easily.

Further, by the upward movement of the body portion 110, the expansion bit 130 can be maintained in a flat state disposed inside the housing 140 so that the bit assembly 100 can be easily inserted into the hole. have.

In addition to the functions described above, the cover 170 may prevent foreign matters such as soil and dust generated when forming the uneven grooves from flowing into the housing 140 to secure the integrity of the bit assembly 100. .

FIG. 6 is a plan view of the bit assembly for expanding an uneven groove shown in FIG. 1.

Referring to FIG. 6, when the housing 140 is moved upwards or downwards, the housing 140 includes anti-shake parts 111 and 143 for preventing the body part 110 from shaking.

More specifically, the anti-oscillation parts 111 and 143 are grooves 143 formed on the inner circumferential surface of the housing 140 along the longitudinal direction of the housing 140, and the body portion 110 to correspond to the grooves 143. ) Is formed on the outer circumferential surface and inserted into the groove 143.

That is, the shaking of the body portion 110 is prevented by the shaking preventing portions 111 and 143, so that the movement of the body portion 110 can be made more stable.

In addition, it is possible to prevent accumulation of fatigue and reduction in kinetic energy of the body portion 110 that may occur when the body portion 110 hits the inner circumferential surface of the housing 140.

Hereinafter, an operating state of the bit assembly will be described with reference to FIGS. 7 and 8.

7A to 7C are operating state diagrams of the bit assembly for uneven groove expansion shown in FIG. 1, and FIG. 8 is a bottom view of the cover, elastic portion, and elastic transfer portion removed from the bit assembly for uneven groove expansion illustrated in FIG. 7B .

Referring to FIG. 7A, in the flat state, the protruding bit 130 is disposed inside the housing 140 while the protruding protrusion 133 is fitted into the opening 141.

The piston 11 moves downward to strike the body portion 110, thereby generating kinetic energy in which the body portion 110 moves downward.

And referring to Figure 7b, when the downward movement of the body portion 110, the body portion 110 pushes the expansion bit 130, the expansion bit 130 along the guide portion 120 As the slide moves, the expansion protrusion 133 protrudes out of the housing 140 through the opening 141 as shown in FIG. 8.

As the expansion bit 130 receives the kinetic energy of the body portion 110 and protrudes in the radial direction of the body portion 110, an uneven groove is formed and expanded around the perforation.

Here, as described above, when the protruding protrusion 133 applies an impact around the perforation hole, as the force is concentrated on the protruding tip 134, an uneven groove can be formed more smoothly, and furthermore, the driving part 10 ) Initial load can be reduced.

When the protruding bit 130 continues to move and the engaging portion 132 contacts the edge of the opening 141, the movement of the protruding bit 130 is stopped, and the protruding protrusion from the opening 141 The protrusion of 133 is restrained.

And referring to Figure 7c, the repulsive force is generated in the cover 170, the elastic portion 150 is restored by the elastic energy of the elastic portion 150, the kinetic energy of the body portion 110 moves upward Occurs, and the body portion 110 is moved upward.

And, when the body portion 110 is moved upward, the body portion 110 pulls the expansion bit 130, and the expansion bit 130 slides along the guide portion 120, and at the same time The expansion bit 130 is inserted into the interior of the housing 140 through the opening 141.

Furthermore, kinetic energy in which the piston 11 moves upward is generated by the impact energy generated by the body portion 110 hitting the piston 11 and resulting from this, and the bit assembly 100 is shown in FIG. 7A. It returns to the correct position shown.

Hereinafter, a method of constructing a lock bolt using the above-described bit assembly will be described with reference to FIGS. 1 to 10.

FIG. 9 is a flow chart of a method for constructing a lock bolt using the bit assembly shown in FIG. 1, and FIG. 10 is a flow chart embodying the step of forming the uneven groove shown in FIG. 9.

Referring to Figure 9, the lock bolt construction method (S100), first, to form a perforated hole (S110), such a perforated hole to fix the lock bolt by forming a perforated hole in the interior and exterior materials of a tunnel, rock, rock, building to be.

Thereafter, an uneven groove is formed using the bit assembly 100 (S120), and the uneven groove is to secure a space for making the fastening of the lock bolt better.

That is, since the grout can be more effectively cured in the concave-convex groove, the lock bolt can be firmly fastened, so that the lock bolt fastening is released even with a small impact when using only the punched hole.

More specifically, referring to FIG. 10, when the bit assembly 100 moves downward of the body portion 110, the expansion bit 130 protrudes out of the housing 140 through the opening 141. To form an uneven groove around the perforated hole. (S121)

And when the body portion 110 is moved upward, the expansion bit 130 is inserted into the interior of the housing 140 through the opening 141 (S122), the bit assembly 100 is a perforated hole When moving along, it is possible to prevent the expansion bit 130 from being caught around the perforation hole, and further, to prevent the breakage of the bit assembly 100, it is possible to obtain an effect of easy maintenance.

Here, as described above, when the main bit installed in the lower portion of the driving unit 10 or the lower portion of the body portion 110 is drilled in close contact with the ground, which is the lower end of the drilling hole, the main bit is applied to the reaction force generated by striking the ground. By generating the kinetic energy that the body portion 110 moves upward, the formation of the perforated hole and the formation of the uneven groove may proceed.

Alternatively, by generating a kinetic energy in which the body portion 110 moves upward by the repulsive force by the elastic energy of the elastic portion 150, the formation of an uneven groove in the middle region of the perforation hole may proceed.

Therefore, by using the bit assembly 100, it is possible to provide a more effective method of constructing a lock bolt since the contractor can construct an uneven groove more accurately at a desired position.

Thereafter, a grout such as resin or mortar is filled in the perforated hole and the uneven groove. (S130)

In the conventional rock bolt construction, only the perforated hole was filled with grout, but the present invention can be implemented so that the lock bolt can be fixed more effectively by filling the grout in the perforated hole and the uneven groove.

Thereafter, a lock bolt is inserted into the punched hole. (S140)

This is to prevent the dropping or to be used as a support hole by inserting a lock bolt into the inner and outer surfaces of a tunnel, rock, rock or building, and since it uses an uneven groove, it is possible to fix the lock bolt firmly in the drilling hole. have.

After this, tighten the lock bolt with a nut. (S150)

This has the effect of fixing the rock bolt more firmly in the tunnel, rock, rock, building exterior, interior materials.

Here, since the locking bolt insertion (S140) and the grout filling process (S130) can produce the same effect even if the order is changed, the grout filling process (S130) forms the uneven groove (S120) and the rock bolt. It may proceed between the process of inserting (S140), or after the process of inserting a rock bolt (S140),

Therefore, the contractor can selectively use the locking bolt insertion (S140) or the grout filling process (S130) selectively to increase the versatility.

As described above, the rock bolt construction method using the uneven groove expansion bit assembly and the uneven groove according to an embodiment of the present invention forms the uneven groove only by hitting the piston as the kinetic energy of the piston is transmitted from the body to the expansion bit And expand.

In addition, since the movement direction of the expansion bit can be changed perpendicular to the movement direction of the body portion, the uneven groove can be formed and extended even on a hard ground unlike the conventional rotation method.

In addition, since the kinetic energy of the piston can be concentrated on the protruding tip formed in the expansion bit, uneven groove formation can be smoothly performed, and the initial load of the driving unit can be reduced.

In addition, since the outer surface of the cover moves along the perforated hole, there is an effect of preventing meander expansion.

As described above, optimal embodiments have been disclosed in the drawings and specifications. Although specific terms have been used herein, they are only used for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: drive unit 11: piston
100: uneven groove expansion bit assembly 110: body portion
120: guide portion 130: expansion bit
140: housing 150: elastic part
160: elastic transfer unit 170: cover

Claims (9)

A bit assembly that is fastened to a hammer having a piston that moves up and down,
A body part which moves up and down by the piston;
A guide portion formed in an inclined direction from the lower portion of the body portion;
An expansion hole that slides along the guide portion by the movement of the body portion; And
A housing in which the body portion and the expansion bit are accommodated, and an opening that protrudes when the expansion bit slides; Including,
Further comprising an elastic portion disposed under the body portion,
A cover for accommodating the elastic part is coupled to a lower portion of the housing,
When the elastic portion moves downward, the lower portion is supported on the cover to undergo compression deformation, and the elastic portion is restored by elastic energy generated during compression deformation and moves the body portion upward,
The body assembly is repeatedly moved up and down by the piston and the elastic portion, the bit assembly for the uneven groove expansion, characterized in that the protruding bit repeatedly protruding from the housing.
According to claim 1,
The expansion bit is
A moving guide installed in the guide portion;
A protruding protrusion formed on one side of the movement guider and protruding from the opening; And
A locking portion formed on the other side of the movement guider and contacting the edge of the opening when the protruding protrusion protrudes;
A bit assembly for expanding an uneven groove comprising a.
According to claim 2,
The expansion bit is
A bit assembly for expanding a concave-convex groove further comprising a protruding tip formed by a part of the protruding protrusion protruding relatively from the rest.
delete According to claim 1,
The lower portion of the body portion is formed with an inclined portion having a wide upper section and a narrow lower section,
The guide portion is formed on the inclined portion,
An elastic transmission portion is disposed between the body portion and the elastic portion, and the elastic transfer portion has a narrow upper portion and a wide lower section so as to contact the inclined portion and the elastic portion.

The method of claim 5,
The cover is a bit assembly for uneven groove expansion, characterized in that it consists of a support portion for supporting the elastic portion is formed narrowly in the lower direction and the cylindrical shape extending in the lower direction.


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