KR20080089733A - Hammer drill with air pressure impact apparatus - Google Patents

Abstract

A hammer drill with an air pressure impact device is provided to employ a pair of bit chuck rings having a semi-circular shape and a grasp unit at one side of an outer circumference of the bit chuck ring. A hammer drill includes an air pressure impact device(100). The air pressure impact device includes a casing adaptor(110), a casing hammer(120), a hydraulic air supplying head unit(130), a piston rod(140), a bit chuck(150), a bit hammer ring(160), and a bit chuck ring(170). The casing adaptor is coupled with a rear end of a casing pipe. The casing hammer has a cylindrical shape. The casing hammer is provided with a cylinder. The hydraulic air supplying head unit includes a check valve(132). The piston rod reciprocates in the cylinder. The bit chuck is coupled with the casing adaptor. The bit hammer ring prevents the casing adaptor from being separated. The bit chuck ring reduces elasticity of the casing adaptor.

Description

Hammer drill with air pressure impact apparatus

1 is an overall perspective view of a perforator equipped with a pneumatic strike device according to the present invention.

Figure 2 is an exploded perspective view of a perforator equipped with a pneumatic strike device according to the present invention.

Figure 3 is an enlarged perspective view of the main portion of the bit hammer of the pneumatic strike device according to the present invention.

4 is a cross-sectional view of a perforator equipped with a pneumatic impact device according to the present invention.

5 and 6 is a cross-sectional view of the operating state of the perforator equipped with a pneumatic impact apparatus according to the present invention.

Figure 5 is a cross-sectional view of the pre-operation state of the perforator equipped with a pneumatic impact apparatus according to the present invention.

Figure 6 is a cross-sectional view of the post-operation state of the punching machine equipped with a pneumatic impact apparatus according to the present invention.

Figure 7 is an embodiment of a state of use of the punching machine equipped with a pneumatic impact device according to the present invention.

* Description of the major symbols in the drawings *

M: Drive Motor P: Drilling Machine

10 casing pipe 12 male thread

20: caching bit 100: pneumatic strike device

110: casing adapter 112: female thread

114: step 116: compressed air discharge groove

120: casing hammer 122: cylinder

130: pneumatic supply head 132: check valve

140: piston rod 142: hitting groove

150: beat chuck 152: through hole

154: fitting groove 160: beat hammer ring

170: beat chuck ring 172: gripping means

The present invention relates to a perforator equipped with a pneumatic striker, and more particularly, to drill a pipe hole in the ground or rock to insert the anchor (reinforcement, pipe) of the stress material in the soft ground or poor topigo soil with poor geological conditions By having a separate pneumatic strike length at the rear end of the caching bit of the punching machine to be applied, the punching force is applied to the punching machine side during the drilling work for stabilization of the ground, and it is possible to perform a straight drilling with excellent quality according to the straightness of the drilling. The present invention relates to a perforator equipped with a pneumatic percussion apparatus which can reduce the reduction and fast workability, and thus shorten the air and reduce the cost.

In general, a perforator (P) according to the prior art for drilling holes for inserting anchors (reinforcing bars and pipes) as stress materials in soils with poor geological conditions or low toffee heights is easy to drill by breaking rocks, etc., at the ends. The caching bit 20 is provided at the front end of the puncher P, and the driving motor M is provided at the rear end thereof so that the punching machine P is rotated by the drive motor M and the caching bit 20 is rotated. Consists of a structure formed to puncture the ground.

The drilling work by the conventional boring machine is not able to secure the stability of the soil with poor geological conditions or low topigo height, and the construction using such a conventional boring machine is a variety of methods such as surface reinforcement, ground reinforcement, tunnel reinforcement, dam foundation treatment, etc. It is widely used in the field. That is, when the construction of the surface reinforcement, ground reinforcement, tunnel reinforcement, dam foundation treatment, etc. through the drilling machine according to the prior art of the structure as described above, when drilling in the ground drilling anchor (reinforcement, pipe) only by rotating the drill It is.

However, such a conventional punching machine simply drills the ground while the drill bit provided at the front end rotates in the drive motor, and the drilling time is increased, and there are problems such as delay in air, increase in construction cost, and increase in labor cost. If the drill bit is located on an obstacle such as a rock layer during ground drilling, the rock plate layer is broken and bored by the frictional force of the drill bit that is rotated, but when the hardness of the obstacle such as rock layer is high, the drill bit rotates The excavation of, but the straightness is shifted, the efficiency is inefficient. That is, as described above, there is a problem that can cause a significant delay of the air through this process, and when the construction of the surface reinforcement, ground reinforcement, tunnel reinforcement, dam foundation treatment, etc. By delaying, there arises a problem that the construction cost increases with the delay of the entire air.

In addition, as described above, when the conventional boring machine is located in the boring obstacles such as the rock layer in the ground, the drill bit according to the rotation of the drill shaft is spaced apart at one side by the boring obstacles such as the rock layer, and may not be able to deviate vertically. Frequent If the drilled drilling as described above does not have a straightness, it is difficult to insert the anchor (reinforcement, pipe), the work efficiency is reduced, the delay of the air is generated and the quality of the drilled drilling is poor.

Therefore, the present invention has been created to solve the problems described above, by providing a pneumatic strike device at the rear end of the perforator equipped with a caching bit, further increase the perforation power of the perforator at the time of the drilling operation and accordingly It is an object of the present invention to provide a perforator equipped with a pneumatic impact device that reduces cost.

In addition, the present invention is the drill bit and the perforated casing of the front end by the pneumatic strike device further provided to be biased toward one side of the drilling direction to be punctured upon encountering a drilling obstacle such as a rock layer in the ground during the ground drilling work It is another object of the present invention to provide a perforator equipped with a pneumatic strike device capable of maintaining the quality of straight drilling by drilling to have straightness without interrupting the drilling operation.

The perforator equipped with the pneumatic impact device of the present invention for achieving the above object is a drive motor (M), a casing pipe (10) provided to rotate in combination with the drive motor (M), the casing pipe ( 10) In the perforator P provided with a caching bit 20 provided to be rotated at the front end and perforated the ground, the rear end of the casing pipe 10 of the perforator P is coupled to one side and driven to the other side. Combination with the motor (M) is provided so as to rotate, pneumatic strike device 100 is provided to strike the rear end of the casing pipe 10 by the pneumatic pressure by the compressor to be individually operated, casing drilling operation and downhamma The punching work is individually performed, and the casing and the downhammer are combined to perform a double punching work simultaneously performing the casing drilling and the downhammer drilling.

Here, the pneumatic strike device 100 includes a casing adapter 110 having a female screw 112 coupled to a rear end of the casing pipe 10 at one side of the inner edge thereof; A casing hammer 120 formed in a cylindrical shape in a longitudinal direction and having a cylinder 122 formed therein; One side is coupled to maintain the airtight on the other side of the casing hammer 120, the other side is coupled to the drive motor (M) is rotated, the inside is connected to the compressor is provided with a check valve 132 to control the compressed air is provided A pneumatic supply head portion 130; A blow groove 142 is formed at one side, and the piston rod 140 is provided to reciprocate in the cylinder 122 formed inside the casing hammer 120 by pneumatic pressure supplied from the pneumatic supply head 130. Wow; A fitting groove 154 is formed at one outer periphery in the circumferential direction, and a coupling through hole 152 is formed therein, and a plurality of wedge-shaped protrusions 156 are formed at the outer periphery in the circumferential direction to the casing hammer 120. A bit chuck 150 coupled to one side of the casing adapter 110 through which the casing adapter 110 is coupled through the coupling through hole 152; The bit hammer ring 160 is coupled to one end of the casing adapter 110 coupled through the coupling hole 152 of the bit chuck 150, and is formed to prevent the casing adapter 110 from being separated from the bit chuck 150. )and; Is coupled between the bit chuck 150 and the casing adapter 110 includes a bit chuck ring 170 is formed so as to control the damping force of the casing adapter 110 hit by the reciprocating motion of the piston rod 140 to control Characterized in that.

On the other hand, the casing adapter 110 of the pneumatic strike device 100 is formed in a cylindrical shape of a multi-stage to reduce the diameter in the longitudinal direction from one side to the other side, the female thread 112 is provided on one side of the casing pipe 10 Is coupled to the rear end, a plurality of step projections 114 having an outer diameter formed larger than the inner diameter of the bit hammer ring 160 to be caught on the other side is formed, the reciprocating motion by pneumatic The piston rod 140 is hit by the other end formed with a plurality of step projections 114 of the casing adapter 110 is characterized in that the impact force is transmitted to the casing pipe 10 side.

In addition, the bit hammer ring 160 of the pneumatic strike device 100 is preferably provided in a pair of semi-circle shape, furthermore, the bit chuck ring 170 is provided in a pair of semi-circle shape, It is preferable that gripping means 172 is provided on one side of each outer edge.

With reference to the accompanying drawings, a configuration of a perforator equipped with a pneumatic impact device according to the present invention as described above will be described in detail.

1 is an overall perspective view of a perforator equipped with a pneumatic striking device according to the present invention, Figure 2 is an exploded perspective view of a perforator equipped with a pneumatic striking device according to the present invention, Figure 3 is a bit of the pneumatic striking device according to the present invention An enlarged perspective view of the main portion of the hammer, Figure 4 is a cross-sectional view of a perforator equipped with a pneumatic impact device according to the present invention, Figures 5 and 6 are cross-sectional view of the operating state of the perforator equipped with a pneumatic impact device according to the invention, Figure 5 Is a cross-sectional view of the pre-operation state of the perforator equipped with a pneumatic strike device according to the present invention, Figure 6 is a cross-sectional view of the post-operation state of the perforator equipped with a pneumatic strike device according to the present invention, Figure 7 is a pneumatic pressure Example of the state of use of a punching machine equipped with a striking device.

As shown in Figures 1 to 4, the punching machine equipped with a pneumatic strike device according to the present invention between the rear end of the conventional punching machine (P) having a casing pipe (10) provided with a caching bit 20 and the drive motor Pneumatic strike device 100 is provided with a connection configuration. Here, in the conventional drilling machine P having the casing pipe 10 provided with the caching bit 20, the male screw 12 is formed at the other end of the opposite side provided with the caching bit 20. On the other hand, the detailed configuration of the caching bit 20, casing pipe 10 and the like of the punching machine (P) has the same configuration as a conventional punching machine, the detailed configuration is omitted in order to clarify the gist of the present invention.

Here, the pneumatic strike device 100 is provided between the conventional perforator (P) and the drive motor, as shown in Figure 2 or 3, the pneumatic strike device 100 is casing adapter 110, casing hammer 120, a pneumatic supply head 130, a piston rod 140, a bit chuck 150, a bit hammer ring 160, a bit chuck ring 170, and the like.

The casing adapter 110 is formed in a multistage cylindrical shape whose outer diameter is reduced in the longitudinal direction from one side to the other side. Here, the casing adapter 110 is provided with a female screw 112 so that the male screw 12 formed at the rear end of the perforator P is coupled to one end of the inner edge having the maximum outer diameter. In addition, a plurality of stepped protrusions 114 are formed along the outer periphery once so as to be caught by the bit hammer ring 160 described later. A plurality of compressed air discharge grooves 116 are formed between one side end and the other end. Here, the compressed air discharge groove 116 is filled with compressed air to the cylinder 122 in the casing hammer 120 to be described later, the compressed air is discharged along the compressed air discharge groove 116 according to the separation of the bit hammer. It is formed to be.

The casing hammer 120 is formed to have a cylindrical shape in the longitudinal direction and penetrates inward to form a cylinder 122. Here, one side of the casing hammer 120 is coupled to the pneumatic supply head 130 to be described later, the other side is coupled to the bit hammer chuck 150 to be described later, a high-pressure compression generated by a compressor (not shown) Preferably, air is coupled to maintain airtight so that pneumatic pressure is applied to the cylinder 122.

The pneumatic supply head 130 is coupled to the other side of the casing hammer 120 described above to one side, and rotated is coupled to the drive motor (M) to the other side. In addition, a check valve 132 is provided inside the pneumatic supply head 130 to control the inflow of compressed air generated by the compressor into the cylinder 122 of the casing hammer 120.

The piston rod 140 is formed in the longitudinal direction in the cylindrical shape, the impact groove 142 is formed at one end, by the compressed air intermittently supplied from the check valve 132 of the pneumatic supply head 130 It is provided to reciprocate in the cylinder 122 inside the casing hammer 120 by the high pressure pneumatic pressure is formed.

The bit chuck 150 is one side of the casing adapter 110 is coupled, the other side is coupled to one side of the casing hammer 120, the coupling through hole 152 is formed therein, the coupling through hole 152 Is formed while the diameter is reduced while forming a stage from one side to the other side. In addition, a fitting groove 154 into which the bit chuck ring 170 to be described later is fitted is formed at one side edge to which the casing adapter 110 is coupled. On the other hand, a plurality of wedge-shaped protrusions 156 formed on the other outer edge in the circumferential direction, while the bit chuck 150 is coupled to one end of the casing hammer 120 while maintaining airtightness and the striking force of the pneumatic strike device 100. By vibrating by the beating can be firmly coupled to prevent the deviation of the bit chuck 150 from the casing hammer 120.

The bit hammer ring 160 is coupled to the bit chuck 150 of the casing adapter 110 described above, and then coupled to one end of the plurality of stepped protrusions 114 of the casing adapter 110 to the casing adapter 110. Is formed to prevent deviation from the bit chuck 150. Here, the bit hammer ring 160 is preferably made of a pair of semi-circular.

The bit chuck ring 170 is formed as a pair of semi-circular rings, and the holding means 172 is formed on one side of the ring-shaped outer edge of each semi-circle. Here, the bit chuck ring 170 is coupled to the fitting groove 154 formed on the outer circumference of the bit chuck 150 as described above when performing the operation of transmitting the striking force by pneumatic to the rear end of the perforator for drilling the ground piston It is positioned to increase the resilience of the casing adapter 110 hit by the reciprocating motion of the rod 140, when the damping force is attenuated between the bit chuck 150 and the casing adapter 110 to form a control do.

That is, when drilling the ground, the bit chuck ring 170 is separated from between the bit chuck 150 and the casing adapter 110 so that the impact force is increased on the perforator P provided at the tip end, and then drilled in a predetermined depth. When extending the casing pipe 10 of the perforator P in order to drill deeper drilling depth of the ground, the pneumatic strike device 100 is rotated in reverse to separate the casing pipe 10 and the casing adapter 110 and pneumatic strike Another casing pipe 10 further provided between the device 100 and the casing pipe 10 is secured to perform a perforated casing operation.

The operation and effects of the punching machine equipped with the pneumatic strike device of the present invention according to the configuration as described above will be described in detail through the embodiment.

As shown in Figure 5 or 6, the present invention is provided with a separate pneumatic strike device 100 at the rear end of the perforator (P). Here, the internal thread 112 is provided at the inner edge of the casing adapter 110 of the pneumatic strike device 100 is coupled to the male screw 12 formed at the rear end of the punching machine (P). After the perforator P is coupled to the pneumatic strike device 100, the driving motor M is coupled to the rear end of the pneumatic strike device 100.

Here, as shown in Figure 4, the pneumatic strike device 100 is provided with a casing adapter 110 is fitted to be adjusted to be spaced apart through the coupling through hole 152 of the bit chuck 150. The semi-circular bit hammer ring 160 is coupled to the plurality of step protrusions 114 of the other end of the casing adapter fitted to the bit chuck 150 so that the casing adapter 110 is not separated from the bit chuck 150. To combine.

Next, the bit chuck 150 coupled to the casing adapter 110 is coupled to one end of the casing hammer 120. At this time, the wedge-shaped protrusion 156 formed on the other end side of the bit chuck 150 is tightly coupled to the casing hammer 120 while maintaining airtightness. Then, the piston rod is coupled to the other end side of the casing hammer 120, the pneumatic supply head 130 having a check valve is coupled. Then, the pneumatic supply head 130 is coupled to the drive motor (M) is rotatable in accordance with the rotation of the drive motor (M). In addition, the compressed air generated by the compressor (not shown) is communicated to flow into the casing hammer 130 through the pneumatic supply head 130.

Thus screwed with the male screw 12 formed on the rear end of the casing pipe 10 to the female screw 112 provided at the inner circumference of the casing adapter 110 of the pneumatic strike device 100 coupled to the drive motor (M). The perforator P is coupled with the pneumatic striker 100. Therefore, to perform the drilling work for drilling of the ground drilling machine equipped with a pneumatic strike device of the present invention configured as described above for the basic construction during construction of surface reinforcement, ground reinforcement, tunnel reinforcement, dam foundation treatment, etc. Located on site

Next, after the punching machine equipped with a pneumatic strike device is located in the drilling work site, the driving motor (M) is driven to rotate the punching machine (P) and the pneumatic strike device (100) to start drilling at the position to be drilled on the ground. . At this time, as the caching bit 20 provided at the tip of the puncher P rotates, the drilling of the ground begins. When the drilling of the ground is started by the caching bit 20 of the front end while the drilling machine P rotates as described above, the drilling machine P is connected by the pneumatic strike device 100 coupled between the rear end of the drilling machine P and the driving motor M. Hitting the back end.

Here, as shown in FIG. 5, the compressed air generated by the compressor is introduced through the pneumatic supply head 130 formed on the other side of the pneumatic strike device 100. The compressed air introduced in this way is opened until a predetermined pressure is reached by the check valve 132 provided inside the pneumatic supply head 130 to allow the compressed air to flow therein.

Next, as shown in FIG. 6, when the internal pressure of the cylinder 122 of the casing hammer 120 reaches a predetermined pressure by the check valve 132 of the pneumatic supply head 130, the check valve 132 Interrupt the compressed air so that it does not flow in any more. Thereafter, the piston rod 140 provided inside the cylinder is quickly moved to the perforator P side by the compressed air at the same time as the check valve 132 is interrupted, and a blow groove formed at one end of the piston rod 140 to be moved ( The other end of the casing adapter 110 connected to 142 is hit. At this time, the compressed air is transmitted to the casing adapter 110 and at the same time, it is discharged to the outside through a plurality of compressed air discharge grooves 116 formed on the other end to the casing adapter 110 by the piston rod 140 Will end the blow.

Next, the casing adapter 110 hit at the end of the blow is received by the impact force of the piston rod 140 to the rear end side of the punching machine (P) coupled to the female screw 112 of one inner peripheral edge of the casing adapter (110). The striking force is transmitted to apply the rotational force and the striking force to the caching bit 20 rotated at the tip of the perforator P at the same time so that the ground perforation is performed quickly.

Next, after the striking force is transmitted, the casing adapter 110 coupled to the bit chuck 150 is inserted into the gap of the fitting groove 154 formed on the outer circumference of the bit chuck 150 together with the punching of the rear end of the puncher P. The piston rod 140 provided inside the cylinder 122 by the other end of the casing adapter 110 spaced apart by the momentary moment generated by the elastic force generated by the casing hammer 120, the pneumatic supply The head 130 is moved to the side.

The piston rod 140 moved in this way is repeatedly generated by the compressed air is intermittently introduced through the check valve 132 of the pneumatic supply head 130, the impact force is continuously transmitted to the casing adapter 110, FIG. As shown in FIG. 7, the drilling operation of the ground by the drilling machine P can be quickly performed by placing the drilling position of the ground.

For example, by hitting the casing adapter 110 through the piston rod 140 reciprocated by pneumatic pressure, such as nailing the rear end of the drilling machine (P) by the pneumatic strike device 100, the casing It is as if hitting the rear end of the punching machine (P) by the adapter (110). Therefore, when the ground is drilled by the caching bit 20, by hitting the punching work by the rotation at the same time, it is possible to perform a fast drilling work, as well as obstacles such as a rock appears during the drilling work ground by the perforator As the drilling of the straightness is lowered to improve the straightness of the excavation through the pneumatic strike device 100 to the portion where the drilling quality is poor, it is possible to perform excellent drilling work.

On the other hand, after a certain depth of drilling work on the ground, in order to drill deeper to extend the drill shaft (not shown) in the rear end of the punching machine (P) provided with the caching bit 20. Here, in order to extend the drill shaft, the coupling of the punching machine P is first released from the casing adapter 110 of the pneumatic strike device 100 coupled with the punching machine P. At this time, the separation of the perforator (P) and the casing adapter (110) is to reverse the drive motor (M) to release the coupling.

Here, before separating the perforator P and the casing adapter 110, the bit chuck ring 170 having the holding means 172 is coupled between the bit chuck 150 and the bit hammer 110. As such, when the bit chuck ring 170 is coupled, the reciprocation of the piston rod 140 by the compressed air is reduced, and at the same time, the elastic force of the casing adapter 110 generated after applying the striking force to the casing adapter 110 is a bit. As the bit chuck ring 170 compensates and fills the gap between the chuck 150 and the bit hammer 110, the striking force stops.

Therefore, the piston rod 140 is returned to the original state in the cylinder 122 of the casing hammer 120 by the bit chuck ring 170, thereby stopping the striking force of the pneumatic strike device 100 to pneumatic strike device Load drilling (downhammer) work is possible without additional separation such as separation of 100. When drilling bit is located on obstacle such as rock layer during ground drilling, work to crush rock plate layer by drilling drill force which rotates However, if there is an obstacle such as the electric floor, it is possible to carry out the double drilling, that is, the casing drilling and the down hammer drilling, together with the down hammer at the same time, while the driving motor (M) does not stop down. Along with the hammer, it is possible to quickly perform the dual drilling of the casing drilling and the down hammer drilling.

In detail, when the striking force is suddenly stopped by the bit chuck ring 170 and only the rotational force of the driving motor M is transmitted to the pneumatic strike device 100, the down hammer rod in the casing pipe 10 together with the down hammer is provided. Is combined to perform a double punch. Thus, during the double drilling operation, the drilling power of the drilling machine is further increased to reduce the speed of construction and its cost, and to maintain the quality of the straight drilling by increasing the efficiency and the straightness.

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, for those skilled in the art that various modifications are possible without departing from the scope of the invention, such modifications are It is within the scope of the claims.

The present invention is provided with a pneumatic strike device at the rear end of the drill bit provided with a drill bit, thereby further increasing the drilling force of the drilling machine during the drilling operation, there is an effect that the quick construction and the resulting cost is reduced.

In addition, the present invention is the drill bit and the perforated casing of the front end by the pneumatic strike device further provided to be biased toward one side of the drilling direction to be punctured upon encountering a drilling obstacle such as a rock layer in the ground during the ground drilling work By having a, there is an advantage that can maintain the quality of the linear drilling by drilling to have a straightness without interrupting the drilling operation.

Claims (5)

A driving motor (M), a casing pipe (10) coupled to the driving motor (M) and rotated, and provided at the tip of the casing pipe (10), rotated, and a caching bit (20) provided to drill the ground. In the boring machine (P) provided with, The rear end of the casing pipe 10 of the perforator P is coupled to one side, and coupled to the driving motor M to the other side to be rotated, and provided to strike the rear end of the casing pipe 10 by pneumatic pressure by a compressor. Pneumatic strike device 100 is formed to be able to operate individually, Drilling machine equipped with a pneumatic strike device, characterized in that the drilling and downhammer drilling operation of the casing can be performed separately, and the double drilling operation for simultaneously performing the casing drilling and downhammer drilling operations by combining the casing and the downhammer is possible. . The method of claim 1, The pneumatic strike device 100 is A casing adapter 110 having a female thread 112 coupled to the rear end of the casing pipe 10 at one side thereof; A casing hammer 120 formed in a cylindrical shape in a longitudinal direction and having a cylinder 122 formed therein; One side is coupled to maintain the airtight on the other side of the casing hammer 120, the other side is coupled to the drive motor (M) is rotated, the inside is connected to the compressor is provided with a check valve 132 to control the compressed air is provided A pneumatic supply head portion 130; A blow groove 142 is formed at one side, and the piston rod 140 is provided to reciprocate in the cylinder 122 formed inside the casing hammer 120 by pneumatic pressure supplied from the pneumatic supply head 130. Wow; A fitting groove 154 is formed at one outer periphery in the circumferential direction, and a coupling through hole 152 is formed therein, and a plurality of wedge-shaped protrusions 156 are formed at the outer periphery in the circumferential direction to the casing hammer 120. A bit chuck 150 coupled to one side of the casing adapter 110 through which the casing adapter 110 is coupled through the coupling through hole 152; The bit hammer ring 160 is coupled to one end of the casing adapter 110 coupled through the coupling hole 152 of the bit chuck 150, and is formed to prevent the casing adapter 110 from being separated from the bit chuck 150. )and; Is coupled between the bit chuck 150 and the casing adapter 110 includes a bit chuck ring 170 is formed so as to control the damping force of the casing adapter 110 hit by the reciprocating motion of the piston rod 140 to control Boring machine equipped with a pneumatic strike device, characterized in that. The method of claim 2, The casing adapter 110 of the pneumatic impacting device 100 is formed in a cylindrical shape having a plurality of stages of which diameter is reduced in the longitudinal direction from one side to the other side, and the female screw 112 is provided at one side of the casing pipe 10. Is coupled to the end, a plurality of step projections 114 having an outer diameter formed larger than the inner diameter of the bit hammer ring 160 to be caught on the other side of the bit hammer ring 160 is formed, Pneumatic pressure, characterized in that the other end is formed by the piston rod 140 reciprocating by the pneumatic pressure to the other end formed with a plurality of step projections 114 of the casing adapter 110 is transmitted to the casing pipe 10 side Perforator equipped with a striking device. The method of claim 2, Bit hammer ring 160 of the pneumatic strike device 100 is equipped with a pneumatic strike device, characterized in that provided in a pair of semi-circular shape. The method of claim 2, Bit chuck ring 170 of the pneumatic strike device 100 is provided in a pair of semi-circular shape, the pneumatic strike device, characterized in that the holding means 172 is provided on one side of each outer edge of the semi-circular shape boring machine.

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