KR0171489B1 - Core drill - Google Patents

Abstract

The present invention relates to a rock excavation method and a cluster core drill and a rock core removing device used in the same, and in particular, by arranging an air hammer drill in a columnar shape to excavate a rock in a core shape, and a mandrel core with a hydraulic force in the digging hole. The present invention relates to a rock excavation method capable of achieving rapid and effective rock excavation by cutting and drawing, and a cluster core drill and rock core removing device used therein.

The present invention comprises the steps of excavating the rock in a ring thickness of a predetermined thickness to form a rock core in the center of the excavation surface; Cutting the lower end of the rock core with a hydraulic force; And drawing a rock core having the lower end separated to the outside to form a circular excavation hole. In addition, there is provided a cruising core drill and rock core removal apparatus used in the rock drilling method. According to the present invention, the rock excavation amount is remarkably reduced, so that the excavation speed is increased, and other work productivity is greatly improved.

Description

Cluster Core Drills Used for Rock Excavation

1 is an explanatory diagram showing the rock excavation method step by step according to the present invention.

2 is a cross-sectional view of the cluster core drill according to the present invention,

a) is a partial cross-sectional view in the longitudinal direction.

b) is a cross-sectional view taken along the line A-A 'of FIG.

c) is the bottom view in the B direction of said a).

d) is a bottom view showing a modified embodiment of the cluster core drill.

3 is a cross-sectional view of the air hammer drill provided in the cluster core drill according to the present invention.

4 is an operating state of the cluster core drill shown in FIG.

5 is a partial cross-sectional view of the rock core removal apparatus according to the present invention.

6 is an operational state diagram of the rock core removal apparatus shown in FIG.

7 is a partially cutaway perspective view of the cluster drill used in the rock drilling method according to the prior art.

8 is a configuration diagram of a general rock excavation device.

* Explanation of symbols for main parts of the drawings

10: annular excavated surface 15: rock core

20: circular excavation hole 30: cluster coredrill

32: casing 37 top cover

40: lower cover 47: tie bolt

70: rock core removal device 82: hydraulic cylinder

86: press surface 110: rock

120: excavator pipe 135: crane

P: annular space S, S1: circular space

The present invention relates to a cluster core drill used for rock excavation, and in particular, by arranging an air hammer drill in a columnar form to excavate the rock into a core form, and by cutting the rock core with hydraulic force from the excavation hole, it is quick and effective. The present invention relates to a cluster core drill used for rock excavation capable of rock excavation.

In general, the rock excavation method is to mount a cluster drill equipped with a plurality of air hammer drill to the excavator to hit the rock by the pressure of the air and to excavate the rock while rotating the cluster drill. Rock excavation device 100 used in such rock excavation method is shown in FIG. The rock excavation device 100 is equipped with a cluster drill 130 at the end of the excavation pipe 120 to drill the rock 110, etc., the excavation pipe 120 is mounted to equipment such as crane 135 It is mounted and rotated by the moving motor 140, the compressed air is supplied to the cluster drill 130 through the air compressor 145 and the compressed air supply pipe 150. In addition, the cluster drill 130 according to the related art has a plurality of air hammer drills 155 fixed to the inside of the hollow casing 152, as shown in FIG. 7, and the air hammer drill 155. Is fixed by covers 157a and 157b located at the upper and lower portions of the casing 152, and the covers 157a and 157b are coupled to the casing 152 by a plurality of bolt members 165, respectively. Will be. In addition, the upper end of the air hammer drill 155 is formed by the nut member 159 in the inner space (S1) of the upper cover (157a) to form a male screw portion (155a), the lower end is equipped with a drill bit (175) One step 160 is in close contact with the side wall 162 of the lower cover 157b, the lower cover 157b is coupled to the casing 152 by a plurality of bolt members 165, the nut member 159 of the By tightening, the air hammer drill 155 is fixed to the cluster drill 130.

However, the rock drilling apparatus 100 as described above is supplied with compressed air to a plurality of air hammer drill 155 fixed on the cluster drill 130, the drill bit 175 hits the rock, the cluster drill As the casing 152 of the 130 is rotated, the drill bit 175 is rotated while hitting the rock, and the rock forms a drilled hole having a size corresponding to the diameter of the cluster drill 130. Therefore, the conventional rock excavation method as described above has a problem that the amount of excavation of the rock is increased due to the large amount of excavation of the rock due to the rocking excavation while hitting the entire boring hole of the rock, and the productivity is reduced.

In order to solve this problem, a technique for greatly reducing the amount of excavation of rock has been proposed. This is to excavate the rock in a ring shape to form a rock core in the center of the excavation surface. The core drill used here is a drill tip made of artificial diamond in the lower end of the cylindrical casing in a ring shape, while rotating the cylindrical casing A rock core of a cylindrical shape is formed at a predetermined length inside the cylindrical casing. Then, the core drill is taken out, and the cylindrical rock core is hit by weight at the top and destroyed to form a ring-shaped excavation surface into a circular rock hole, and the rock core piece placed in the rock hole is attached to a crane or the like. As a grab facility to be mounted, the material is picked up, and then, as a core drill, an annular excavated surface is successively formed in the rock hole to form one long rock hole in turn.

However, this conventional method greatly reduces the excavation area, so the excavation work speed is made quite fast, but it takes a long time to break the cylindrical rock core into a plurality of pieces and pull it out of the rock hole. In particular, the depth that can be excavated at one time as a core drill is approximately 500 mm or less in consideration of removing the broken rock core, and therefore, the overall work time is long, resulting in a decrease in productivity.

The present invention is to solve the conventional problems as described above, by performing the ring digging operation in a state that significantly reduced the amount of rock excavation, the rock excavation is made quickly, the rock core formed on the annular excavation surface quickly It is an object of the present invention to provide a cluster core drill for use in rock excavation which greatly improves the work productivity according to removal at one time.

In order to achieve the above object, the present invention, in the device for excavating the rock embedded in its own weight by using an air hammer drill, the cylindrical inner tube and the external appearance of a certain size are overlapped to form an annular space therebetween And, the upper end of the inner tube and the exterior is integrally connected by a disc-shaped upper cover, the lower end is equipped with an annular lower cover, while a plurality of tie bolts connecting the upper and lower covers across the annular space A casing coupled and mounted to a crane through a connection device provided on the upper cover, the casing being free to move up and down and forward and reverse rotation; And, it is mounted at an equal interval in the annular space provided in the casing is arranged in an annular shape, each of the drill bit is mounted on the lower end to protrude to the lower portion of the lower cover, the compressed air is supplied inside the drill bit A plurality of air hammer drills hitting the rock by air compression force; By forming an annular excavation surface in the rock and to provide a cluster core drill used for rock excavation to form a rock core in the center thereof.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 shows a rock excavation method step by step according to the present invention. In the rock excavation method, as shown in a), when the ground is excavated while the rock 110 is exposed, a cylindrical protective wall W is hypothesized as conventionally around the rock to be excavated. And, as shown in Figure b) is to excavate the rock (110), in this case ring-shaped on the rock (110) using the cluster core drill 30 of the present invention as shown in Figure 2 To form the excavated surface (10). At this time, the thickness (d) of the excavating surface 10 is a size that can be inserted into the hydraulic cylinder 72 of the rock core removal device 70 to be described later.

Therefore, when the ring-shaped excavation surface 10 is formed in the rock 110 as described above, a cylindrical rock core 15 is formed at the center of the ring-shaped excavation surface 10. And, the rock core 15 formed as described above is to cut the lower end point of the rock core 15 by the hydraulic force by the rock core removal device 70 as shown in FIG. This is to cut the lower end of the rock core 15 is located in the annular cut surface 10 is one rock core 15 is cut state. Next, the rock core 15 cut at the lower end as described above is an annular cut surface using a drawing device such as grab that is drawn out to the outside by the rock core removing device 70 or is fixed and used by a crane. It is drawn out from (10) to form a circular excavation hole 20 as shown in Figure d) of FIG.

Further, as described above, the cluster core drill 30 enters the lower surface of the excavation hole 20 from which the rock core 15 has been removed, and processes the annular cut surface 10 again to form a deeper circular excavation hole ( 20) can be formed.

On the other hand, Figure 2 shows the cluster core drill 30 used for rock excavation of the present invention. The cluster core drill 30 has a structure in which a plurality of air hammer drills 200 are mounted on the cylindrical casing 32 in a circumferential direction, and the casings 32 have different diameters. A cylindrical inner tube 34a and an outer tube 34b are provided, and the inner and outer tubes 34a and 34b overlap each other to form an annular space P therebetween.

In addition, a disk-shaped diaphragm 35a is integrally connected to the upper end of the inner tube 34a and the outer tube 34b by welding to firmly support the inner tube 34a and the outer tube 34b, and the diaphragm 35a. A plurality of concave grooves 37a are formed on the lower surface of the upper portion, an air inlet 37b is formed on the inner surface of the upper portion, and the upper cover 37 which can be coupled to a crane through a connector 37c on the upper surface thereof. Is located. Further, an annular lower plate 35b is integrally welded to the lower end of the inner tube 34a and the outer tube 34b so as to close the annular space P, so that the inner tube 34a and the outer tube 34b are closed. The lower portion of the lower plate 35b has a lower cover 40 formed with a plurality of concave grooves 40a.

In addition, the upper and lower diaphragms 35a and 35b each have a plurality of through-holes 42a and 42b constituting an annular shape and coaxially with each other, and have an annular shape corresponding to the through-holes 42a and 42b. In the space (P), a plurality of air hammer drills 200 are mounted, cylindrical and housings 45 are mounted at equal intervals, respectively, and coupling means of the upper and lower covers 37 and 40 and the casing 32. As a result, a plurality of elongated tie bolts 47 extend across the annular space P.

The tie bolts 47 are each head portion 47a is located in the concave groove (40b) of the lower cover 40 and extends through the lower plate (35b) to the annular space (P), the upper plate ( It extends upward through 35a) and is fixed by the nut member 47b on the outside of the upper cover 37.

Therefore, the upper and lower lids 37 and 40 are connected by the tie bolts 47 integrally on the upper and lower diaphragms 35a and 35b. In addition, the casing 32 as described above forms a circular space on the inner surface of the inner tube 34a. In addition, a plurality of air hammer drills 200 are mounted to the casing 32, and the air hammer drills 200 are provided with respective housings 45 and through holes 42a and 42b of the casing 32. The upper and lower ends of the upper and lower lids 37 and 40 are respectively located in the recessed grooves 37a and 40a of the upper and lower lids 37 and 40, respectively, and the upper and lower lids 37 and 40 are disposed on the casing 32. When coupled by a plurality of tie bolts 47 is mounted on the casing 37.

In addition, the air hammer drill 200 mounted to the cluster core drill 30 has a cylindrical shape with a reduced diameter on the lower outer surface 220a of the top sub-220, as shown in FIG. Air inlets 222a and 222b are provided in the horizontal direction, and the upper end portion 222b forms a flat end portion. In addition, in the piston case 230 coupled to the lower surface of the top sub-220, the upper inner circumferential surface 230a forms a cylindrical structure, and the lower outer circumferential surface 220a of the top sub-220 is the peace cone case ( Fit to the upper inner peripheral surface (230a) of the 230, a plurality of air sealing ring (323) is fitted in the coupling portion.

In addition, the lower inner circumferential surface 230b of the piston case 230 also has a cylindrical structure, and the upper outer circumferential surface 240a of the drive sub 240 forms a cylindrical structure and the lower inner circumferential surface 230b of the piscon case 230. The upper outer peripheral surface 240a of the drive sub 240 is coupled to each other via a plurality of air sealing rings 242. In addition, when the air hammer drill 200 is respectively coupled to the housing 45 inside the casing 32, the upper end portion 220a of the top sub-220 that forms a flat end is a concave groove 37a of the upper cover 37. The air intake port 222a, 222b of the top sub-220 coincides with the air inlet 37b of the upper cover 37, while the inner upper surface of the concave groove 37a is fitted. When the cushioning member 225 having an elastic force is positioned so that the upper cover 37 and the cylindrical casing 32 are coupled by a plurality of tie bolts 47, the air hammer drill 200 may be fitted in a more stable state. To ensure that

In addition, a cylindrical dust collector 60 is integrally mounted on the upper side of the upper cover 37, and the inner tube 34a is formed on the upper side of the inner tube 34a and the exterior 34b constituting the casing 32. And through the outer tube (34b), the inner tube (34a) is in communication with the circular space (S) is formed.

The cluster core drill 30 of the present invention configured as described above is mounted to the excavation pipe 120 of the crane 135 as shown in FIG. 8 through a connecting member 37c, which is a conventional cluster drill 30 Is used instead. In this case, the driving motor 140 of the crane 135 rotates the casing 32 through the excavation pipe 120 and the connecting member 37c, and at the same time, the plurality of air hammer drills 202 are provided with compressed air. It is provided through the 145 and the compressed air supply pipe 150.

Therefore, the air hammer drill 200 has compressed air introduced into the piston case 230 through the air inlet 37b and the top sub 220b, and the piston 230a moves up and down, and thus the upper portion of the drill bit 240. By continuously hitting the surface, the drill bit 240 of the air hammer drill 200 disposed in an annular shape on the casing 32 strikes the rock 110 in an annular shape.

In this case, the rock 110 is excavated in an annular shape as shown in FIG. 4 by the rotational operation of the casing 32 and the striking operation of the synchronous hammer drill 200, and at this time, the inner tube 34a of the casing 32. As the space S formed at the center, a rock core 15 having a circular shape is formed. At this time, the rock dust formed during the excavation process is a space between the rock outer excavated surface 10a and the exterior 34b and the rock inner excavated surface 10b and the inner tube by the air spray pressure discharged after the blow operation of the air hammer drill 200. Raised through the space between the (34a) is collected in the dust collector 60 is integrally mounted to the upper cover (37), wherein the dust is raised in the inner tube (34a) of the inner tube (34a) and the appearance ( It is discharged from the inside of the casing 32 through the vent 65 passing through 34b).

This annular rock excavation is carried out by the length that can accommodate the rock core 15 of the inner circular space S of the casing 32, and the excavation is quick because the amount of rock excavation is significantly reduced compared with the conventional art. It is done.

On the other hand, a modified embodiment of the cluster core drill 30 is shown in Figure d) of FIG. The cluster core drill 30 is not coupled to the diaphragm 35b by the long tie bolt 47 with the lower cover 40 as shown in a) of FIG. 2, and surrounds the drill bit 240. The lower cover 35b is attached to the lower plate 35b using a plurality of bolts 69, so that the lower cover 35b may be attached in a block shape. In this structure, the upper cover (not shown) may also be attached to the upper plate. It can be mounted as a bolt.

However, the modified embodiment as described above can be excavated by the rotation operation of the casing 32, the blow operation of the air hammer drill 200 can be excavated in the annular rock 110 and the inner space (S) of the casing 32 ) Will form a cylindrical rock core (15).

When the excavation operation as described above is completed, the removal operation of the rock core 150 formed in a cylindrical shape is performed, which uses the rock core removal apparatus 70 as shown in FIG. The rock core removal device 70 is a disk-shaped cover 74 is integrally connected to the upper portion of the cylindrical conduit 72 to form a rigid reinforcement structure to form a space (S1) of a predetermined size therein, the disk-shaped cover ( 74 is formed with a hook 76 has a body portion 80 that can be moved up and down through the rope 78 to the crane. In addition, a plurality of hydraulic cylinders 82 are mounted at a lower portion of the cylindrical conduit 72 of the body portion 80, and the hydraulic cylinders 82 have an operating rod 84 of the cylindrical conduit 72. It is disposed in the radial direction toward the center line (X) of), and the pressing piece 86 having a pointed end is attached to the front end of the operation rod 84, respectively. In addition, the hydraulic cylinder 82 is connected to a separate hydraulic system 87 located on the ground is configured so that each operating rod 84 is moved forward, backward from the hydraulic cylinder body (82a).

The rock core removal apparatus 70 configured as described above is fitted from the upper portion of the rock core 15 so that the rock core 15 is inserted into the inner space S1 of the cylindrical conduit 72 constituting the body portion 80.

In this case, the hydraulic cylinders 82 fixed to the lower end of the body portion 80 are lowered through the annular excavation surface 10 formed by the cluster core drill 30, respectively, and the bottom surface of the annular excavation surface 10 ( 10c), wherein the operating rod 84 of the hydraulic cylinder 82 is located in the hydraulic cylinder body portion 82a. In this state, when the high pressure working fluid is supplied from the external hydraulic system 87 to the respective hydraulic cylinders 82, the working rod 84 is advanced, and at the same time, it is provided at the peak end of the working rod 84. The pressing pieces 86 are pressed against the outer circumferential surface of the rock core 15, respectively, and the rear surface of the hydraulic cylinder body portion 82a is supported by the rock outer shaft excavating surface 10a.

Then, by the continuous hydraulic supply, the working rod 84 of the hydraulic cylinder 82 moves forward from the solid line on FIG. 6 to the dotted line position, and therefore, the rock core 15 is erected on all sides by the sharp pressing piece 86. Very large pressure is applied from the rock core 15 is cut by forming a crack in the direction in which the pressing force of the operating rod 84 is applied, the pressing piece 86 pointed on this cutting surface This will be inserted.

When the lower portion of the rock core 15 is cut as in the shopping mall, the rock core 15 as described above is pushed by the pressing surface 86 on all sides of the lower surface fixed to the self-moving rod 84 of the hydraulic cylinder 82. Since it is supported from the bottom, the rock core 15 and the rock core removing device 70 are simultaneously lifted from the crane 135 to form a circular excavation hole 20. Then, the clustered core drill 30 as shown in FIG. 2 is inserted into the circular excavation hole 20 formed as described above, so that the annular excavation surface 10 is connected to the lower portion of the circular excavation hole 20. Forming, and by repeating the order of removing the rock core 15 formed in the lower surface of the circular excavation hole 20 through the general core removal device 70 can achieve the rock drilling operation.

According to the present invention as described above, by reducing the amount of rock excavation by digging the rock in a ring can achieve a rapid rock excavation operation, the cylindrical rock core formed during the excavation process is to cut the lower portion using the hydraulic action force And, because it can be removed quickly, rock drilling can proceed quickly to achieve shortening of air as well as the effect that can greatly improve the work productivity.

Claims (2)

In the device for excavating the rock 110 embedded in the ground using the air hammer drill 200, the cylindrical inner tube 34a and the outer surface 34b of a predetermined size are overlapped and inserted into the annular space (P) therebetween. ) And the upper end of the inner tube (34a) and the exterior (34b) are integrally connected by a disc-shaped upper cover (37), the lower end is equipped with an annular lower cover (40), the upper and lower A plurality of tie bolts 47 connecting the covers 37 and 40 are coupled across the annular space P, and connected to the crane 135 through a connecting device 37c provided in the upper cover 37. Casing 32 is mounted, free to move up and down, forward and reverse rotation; And, in the annular space (P) provided in the casing 32 is mounted at an equal interval and arranged in a ring shape, the drill bit 240 is mounted on the lower end, respectively, protruding to extend below the lower cover (40) Compressed air is supplied therein, and the drill bit 240 has a plurality of air hammer drills 200 hitting the rock 110 by the air compression force. 10) The cluster core drill used for rock excavation, characterized in that to form a rock core (15) in the center thereof. According to claim 1, wherein the upper surface of the upper cover 37 is formed with a cylindrical dust collecting groove 60, the casing 32 is a plurality of through the inner, outer tube (34a) (34b) on the upper side Crust core drill used for rock excavation, characterized in that the two vents 65 are formed.