KR101119199B1 - Reverse circulation drill apparatus - Google Patents

Abstract

PURPOSE: A reversely circulating excavation apparatus is provided to prevent damage to a gear by maintaining the water-tightness of a gear box unit. CONSTITUTION: A reversely circulating excavation apparatus comprises multiple drill pipes(100), stabilizers(200), a bit body unit(300), and a gear box unit(400). The drill pipes are vertically connected to each other. The stabilizers are formed in the drill pipes to prevent the horizontal movement of the drill pipes. The bit body unit is connected to the drill pipes and has multiple roller bits. The gear box unit is formed between one side of the drill pipes and the bit body unit and supplies driving force to the bit body unit to rotate the bit body unit.

Description

Reverse Circulation Excavator {REVERSE CIRCULATION DRILL APPARATUS}

The present invention relates to a reverse circulation excavation device, and more particularly, to a reverse circulation excavation device capable of excavating a dredging surface on which an underwater structure is installed to install an underwater structure.

In general, industrial facilities require a lot of industrial water, and in particular, power generation facilities are usually constructed in coastal areas to secure sufficient water resources.

As one example of the power generation facilities, a nuclear power generation facility is a power generation facility for generating electricity by generating steam from water of a steam generator using heat generated during nuclear fission of uranium, and operating a turbine with the power of the steam.

The steam used to operate the turbine is cooled in the condenser, made of water, and sent back to the steam generator. At this time, the cooling water used is the hot water and is discharged through the vertical sphere when it is used for cooling sufficiently as sea water.

However, the reason why the warm drainage is discharged from the deep is that when the warm drainage is discharged through the sea floor, the temperature of the seawater is mixed with the deep seawater, which is relatively low.

As such, in-depth intake and drainage facilities are mainly applied to thermal power plants, steel mills, and general industrial facilities in addition to nuclear power plants.

Recently, a reverse circulation drill (RCD) method is widely used when constructing such an intake / drainage facility, and a reverse circulation excavation device is used to excavate a dredging surface in the RCD method, and Patent Publication No. 10-0880365 discloses such a method. A reverse circulation excavation device is disclosed.

As can be seen from Korean Patent Publication No. 10-0880365, the reverse circulation excavation device is provided with a bit to excavate the dredging surface at the bottom, the bit is to rotate the dredging surface while rotating. When a plurality of gears provided in the gear box connected to the driving unit providing the driving force rotates, the bit is rotated in conjunction with the plurality of gears.

By the way, such a reverse circulation excavation device, due to the nature of the excavation work is carried out in the water arranges the gear box in conjunction with the bit out of the water surface. This is to prevent water from penetrating into the gearbox when the gearbox is placed in water, so that the driving force of the gear falls, and thus it is not operated smoothly or is rusted or damaged due to moisture contact.

However, when the plurality of gears are placed out of the surface in this manner, the distance between the plurality of gears and the bits is too far, so that the driving force transmitted to the bits is weakened, so that the excavation work may be slowed.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is provided with a gear box unit for rotating the bit body unit provided with a roller bit to be directly connected to the bit body unit to be submerged in water, but the gear box unit The purpose of the present invention is to provide a reverse circulation excavation device in which internal watertightness is maintained to prevent damage to the gear and improve driving force of the bit body unit.

According to the present invention for achieving the above object, a plurality of drill pipes connected in the vertical direction; A plurality of stabilizers provided along outer peripheries of the plurality of drill pipes to prevent horizontal movement of the plurality of drill pies; A bit body unit connected to the plurality of drill pipes connected thereto and having a plurality of roller bits for digging a dredging surface; And a gear box unit provided between the plurality of drill pipes connected to the bit body unit and transmitting a driving force to the bit body, wherein the gear box unit is configured to prevent water from penetrating into the gear box. It is coupled to one side of the gear box unit provides a reverse circulation excavation device comprising a sealing unit to improve the watertight holding force of the gear box unit.

According to the present invention, the watertightness inside the gearbox can be maintained even when the gearbox is placed in water for the operation of discharging the excavated soil in the form of slime by coupling the sealing unit to one side of the gearbox unit equipped with the gear. Moisture penetration is prevented, and through this the gear box unit can be directly connected with the bit body unit, so that the driving force of the bit body unit can be greatly improved.

In addition, because the gear box unit is located directly below the bit body unit, the driving force is transmitted directly to the bit body unit instead of being transmitted through the drill pipe. It is possible to provide a reverse circulation excavation device which is reduced to improve the stability of the excavation operation.

1 is a front view showing a partial cross-section of the reverse circulation excavation device according to an embodiment of the present invention.
FIG. 2 is a front view showing a partial cross section of the drill pipe according to FIG. 1. FIG.
3 is a plan view of the gear box unit according to FIG. 1.
4 is a cross-sectional view of the gear box unit according to FIG. 1.
5 is an enlarged cross-sectional view of "A" of FIG.
6 is a bottom view of the bit body unit according to FIG. 1.
7 is a bottom view of a bit body unit according to another exemplary embodiment of the present invention.
8 is a cross-sectional view of the swivel joint portion according to the embodiment of the present invention.
9 is an enlarged cross-sectional view of a portion “B” of FIG. 8.
10A is a plan view of a fixed swivel joint and a rotary swivel joint.
10B is a side view of the fixed swivel joint and the rotary swivel joint.
FIG. 11 is an enlarged partial view of the portion “C” of FIG. 10B.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

The reverse circulation drilling rig according to the present invention includes a plurality of drill pipes 100 connected to each other, a plurality of stabilizers 200 provided along an outer circumference of the drill pipe 100, and a bit body connected to the drill pipe 100. The unit 300 includes a gear box unit 400 provided between the drill pipe 100 and the bit body unit 300.

Drill pipe 100 may be provided by connecting a plurality in the vertical direction so that the bit body unit 300 is close to the excavated portion of the dredging surface. This can increase the overall length of the reverse circulation drilling rig. In addition, the drill pipe 100 may be further connected to the bit body unit 300 in the excavation depth.

For example, the drill pipe 100 has flanges formed at both sides in a length direction thereof, so that when the plurality of drill pipes 100 are connected, the drill pipes 100 may be coupled by bolting after contacting the flanges. The plurality of drill pipes 100 may be formed to have various different lengths, and for connection of the plurality of drill pipes 100, the drill pipes 100 may have the same diameter. However, when the drill pipe 100 requires a predetermined or more rigidity as the drilling depth deepens, the diameter or the thickness of the drill pipe 100 may be adjusted according to the required rigidity.

Drill pipe 100 has a discharge passage 110 for discharging the slime excavated by the bit body unit (300, 300 ') mixed with water is formed along the central axis, discharge passage 110 ) Is connected to the discharge holes 330 and 330 'formed in the bit body unit 300 to be described later.

And the air supply passage 130 is formed symmetrically with respect to the discharge passage 110, for example. Air supply passage 130 is formed so that the air (air) supplied from the outside of the reverse circulation excavation device is transmitted to the bit body unit (300,300 '), the high pressure air is supplied through the air supply passage 130 As a result, the slime excavated by the bit body units 300 and 300 'may be pushed up through the high-pressure air and discharged to the outside.

The stabilizer 200 may be provided to be spaced apart from each other on the outer circumferential surface of the drill pipe 100 is connected to a plurality. The stabilizer 200 serves to stably clamp (back) the reverse circulation excavation device in contact with the inner circumferential surface of the casing or the side of the excavated portion when the reverse circulation excavation device is excavated.

For example, the stabilizer 200 may be provided with a hydraulic cylinder, thereby more strongly clamping the casing or clamping the excavated portion, thereby serving to help stabilize the excavation work.

On the other hand, since the stabilizer 200 can be adjusted in size according to the diameter of the casing and the excavated portion, even if the excavation with a reverse circulating digging device having a different diameter, only the bit body unit (300,300 ') is replaced continuously Excavation work can proceed.

The gear box unit 400 is provided between one side of the plurality of drill pipes 100 connected to each other and the bit body unit 300 to provide a driving force for the bit body unit 300 to rotate.

The gear box unit 400 is fitted with a gear box 410 having a hollow along a central axis, a main gear 420 inserted into the hollow in the gear box 410 along the circumferential direction of the main gear 420. A plurality of auxiliary gears 430 and one side of the gear box 410 includes a sealing unit 450 that prevents water from penetrating into the gear box 410 to maintain watertightness inside the gear box 410. do.

The gear box 410 may be formed in a cylindrical shape, as described above, a hollow is formed along a central axis, and one side of the gear box 410 may include a main gear 420 and an auxiliary gear 430 therein. It can be opened so that it can be.

The main gear 420 and the auxiliary gear 430 provided inside the gear box 410 mesh with and rotate. The roller bit 310 provided in the bit body unit 300 connected to the gear box unit 400 may rotate in conjunction with the meshing rotation of the main gear 420 and the auxiliary gear 430.

The above-described sealing unit 450 is coupled to the open portion of the gear box 410 to prevent the water from penetrating into the gear box 410 is the main gear 420 and the auxiliary gear 430 is rusted or damaged Serves to prevent this from happening.

The sealing unit 450 includes an outer ring 451, an inner wear ring 453, a seal housing 455, and a sealing member 457.

The outer ring 451 is coupled to the hollow inner circumference of the gear box 410 is fastened by the main gear 420 and the bolt. The inner wear ring 453 is coupled to the outer circumference of the outer ring 451 but is fastened by the main gear 420 and the bolt. Finally, the seal housing 455 is coupled to the outer circumference of the inner wear ring 451, and is fastened by a bolt to one side of the gear box 410.

The sealing member 457 is provided between the outer wear ring 451 and the inner wear ring 453, and between the inner wear ring 453 and the seal housing 455. The sealing member 457 is provided with the sealing member. Sealing grooves 453a and 455a which may be provided with 457 are formed.

The sealing members 457 may be spaced apart from each other, and a plurality of sealing grooves 453a and 455a provided with the sealing members 457 may be formed to be spaced apart from each other.

In an embodiment of the present invention, the sealing member 457 may be provided in the form of an oil-seal in which grease is injected into the “U” shaped packing, for example. Therefore, the sealing unit 450 may further include a grease automatic injector capable of automatically injecting grease.

For example, the grease autoinjector is a grease pumping device (not shown) for supplying grease supplied from the outside to the sealing unit 450, a grease ripple 459 mounted to the sealing unit 450, a grease pumping device and grease It may include a hose (not shown) provided between the ripple 459 to connect the grease pumping device and the grease ripple 459. However, referring to FIG. 5, only the configuration of the grease ripple 459 is shown in the drawing of the grease automatic injector, which is a portion connected to the sealing unit 450.

When the sealing unit 450 is provided with a grease ripple 459, a grease ripple 459 coupled to the outer ring 451 is provided in the sealing groove 453a provided in the inner wear ring 453 as shown in FIG. 5. ) May inject grease, and the grease ripple 459 coupled to the seal housing 455 may inject grease into the sealing groove 455a provided in the seal housing 455.

The grease is injected to prevent water from penetrating into the gear box 410 of the gear box unit 400 located in the water during the excavation operation. In addition, the sealing member 457 is provided with a "U" shaped packing so that the upper end (opened portion) of the "U" in the direction in which the pressure acts, so that the upper end (opened portion) of the "U" in the direction in which the pressure acts. ), The watertightness can be enhanced. Thus, with the sealing member 457 provided in the form of the "U" -shaped packing, the grease is supplied to the gap at a predetermined pressure, so that the resistance to the action of the pressure is higher and more reliable water tightness can be ensured.

And through this gap in the “U” shaped packing, grease leaks out of the water into a gap between the outerwear ring 451 and the innerwear ring 453 and a gap between the innerwear ring 453 and the seal housing 455. There is also an effect that can be prevented. For example, the inner wear ring 453 and the seal housing 455 are each provided with four sealing members 457, one of which sealing member 457 to withstand the internal pressure of the gear box 410 It is provided to withstand the external pressure of the gear box 410 and is provided to maintain the watertight.

That is, one of the four "U" -shaped packings provided to withstand the internal pressure is provided so as to be arranged to open the inner side of the gear box 410, the other three "U" -shaped packing is the gear box The portion that is flared to the outer side of the 410 is provided to be arranged.

As described above, when the grease is continuously injected through the grease ripple 459, the gap of the “U” -shaped packing is further increased by the pressure at which the grease is injected, thereby further improving the sealing effect.

On the other hand, the gear box unit 400 as described above may be provided once again covered by the gear box drum 401 because the excavation operation of the reverse circulation excavation device can be made in water, the gear box drum 401 Covered by it can have an effect to assist in preventing the penetration of water.

In addition, since the water box of the gear box unit 400 ensures the watertightness, the gear box unit 400 may be connected to the bit body unit 300 in a neighborhood, and thus the driving force of the bit body units 300 and 300 ′ may be greatly improved. have.

In the prior art, it was difficult to maintain the watertightness of the gearbox unit, so that the gearbox unit was spaced far from the bit body unit in case the reverse circulation excavation device was to perform the underwater excavation work. Therefore, the gearbox unit is provided to be located outside the water when the reverse circulation drilling apparatus is underwater, and the driving force is not properly transmitted to the bit body unit as the distance between the gear box unit and the bit body unit increases.

However, when the sealing unit 450 is coupled to the gear box unit 400 to improve the watertight holding force as in the embodiment of the present invention, the gear box unit 400 may be located in the water, and the gear box unit 400 and the bit Since the body units 300 and 300 'may be closely connected, the driving force of the bit body units 300 and 300' may be improved as described above.

The bit body units 300 and 300 ′ connected to the gear box unit 400 are connected to the connection pipe 100 by the gear box unit 400 and also serve to excavate a dredging surface.

The bit body units 300 and 300 ′ are provided with a plurality of roller bits 310 and 310 ′ which directly excavate the dredging surface on one side in contact with the dredging surface. For example, in the exemplary embodiment of the present invention, as illustrated in FIGS. 6 and 7, the plurality of roller bits 310 and 310 ′ may be provided helically based on the central axis of the bit body units 300 and 300 ′.

The bit body units 300 and 300 'are provided with discharge holes 330 and 330' which are symmetrical with respect to the central axis. As the plurality of roller bits 310 and 310 'are provided in a helical manner, when the bit body units 300 and 300' drill the dredging surface, the slime mixed with the excavated soil and the bit body unit is formed by the spiral guides of the roller bits 310 and 310 '. It may be discharged to the discharge holes (310,310 ') formed in (300,300').

6 and 7 illustrate bit body units 300 and 300 ′ having different diameters, and the bit body unit 300 ′ illustrated in FIG. 7 includes the bit body unit 300 illustrated in FIG. 6. Is larger than diameter.

Regardless of the size of the diameters of the bit body units 300, 300 ′, the roller bits 310, 310 ′ are identically formed spirally with respect to the central axis. In addition, in the case of the bit body unit 300 ′ having a larger diameter as illustrated in FIG. 7, the roller bit 310 ′ may be formed only in a partial region. In addition, the spaced apart intervals of the discharge holes 330 'formed in the large bit body unit 300' are farther than the spaced apart intervals of the discharge holes 330 formed in the small diameter bit body unit 300. Can be formed.

The discharge holes 330 and 330 'may be formed separately from each other when viewed from the side where the roller bits 310 and 310' are provided, but as an example, the discharge holes 330 and 330 'are directed toward the side connected to the gear box unit 400. The discharge holes 330 and 330 'spaced apart from each other may be connected to each other.

When the slime is discharged through the discharge holes 330 and 330 ′, the slime may be easily discharged through the discharge passage 110 formed in the drill pipe 100.

8 is a cross-sectional view of a swivel joint part according to an embodiment of the present invention, FIG. 9 is an enlarged cross-sectional view of a portion “B” of FIG. 8, FIG. 10A is a plan view of a fixed swivel joint and a rotary swivel joint, and FIG. 10B is a fixed swivel Side view of the joint and the rotary swivel joint, and FIG. 11 is an enlarged side view of the portion “C” of FIG. 10B.

8 to 11, the reverse circulation excavation device according to the embodiment of the present invention may further include a swivel joint part 500, and the swivel joint part 500 is provided in the master boom although not shown in the drawing. Can be.

Swivel joint portion 500 may be disposed on the upper side of the drill pipe 100 may be rotatably provided so as to be fastened by matching with the drill pipe 100, as described above is provided in the master boom It can be placed on the jack-up pants with the master boom in case of reverse circulation excavation at sea.

The swivel joint part 500 may include a body 501, a rod 530, a fixed swivel joint 513, a rotary swivel joint 511, and a hydraulic cylinder 550.

The main body 501 may be provided with a rod 530 to which the drill pipe 100 is detachably fastened. As described above, a part of the swivel joint part 500 may be rotated so as to be engaged with the drill pipe 100, and for example, the rod 530 may be rotated by a predetermined angle.

More specifically, the rod 530 may be rotated by a predetermined angle by the fixed swivel joint 513 and the rotary swivel joint 511. The fixed swivel joint 513 and the rotary swivel joint 511 are fitted in such a manner that the rod 530 can be engaged with the drill pipe 100 through the registration (rod 530 and all the fastening positions of the drill pipe 100 coincide with each other). To rotate the rod 530 by a predetermined angle.

10A and 10B illustrate a fixed swivel joint 513 and a rotary swivel joint 511. As shown in the drawing, the fixed swivel joint 513 and the rotary swivel joint 511 may be formed in the same shape. have. The rotary swivel joint 511 is engaged with the fixed swivel joint 513 so as to be rotatable by a predetermined angle, and for example, the fixed swivel joint 513 is disposed below the rotary swivel joint 511.

The swivel joints 511 and 513 protrude in one direction to the circular body, but are spaced between the uneven parts 511a and 513a which are spaced apart along the circumferential direction of the circular body and the uneven parts 511a and 513a. The grooves 511b and 513b may be formed. Referring to Fig. 10A, the portions marked with the "凸" shape represent the uneven parts 511a and 513a, and the portions marked with the "凹" shape represent the groove parts 511b and 513b.

When the fixed swivel joint 513 and the rotary swivel joint 511 are engaged with each other, the fixed swivel joint 513 is disposed below the rotary swivel joint 511, and then the uneven portion 513a of the fixed swivel joint 513 is provided. And the uneven parts 511a of the rotary swivel joint 511 may face each other. At this time, the uneven portion 513a of the fixed swivel joint 513 corresponds to the uneven portion 511b of the rotary swivel joint 511, and the uneven portion 511a of the rotary swivel joint 511 is a fixed swivel joint 513. The fixed swivel joint 513 and the rotary swivel joint 511 may be engaged with the recess 513b of FIG.

The fixed swivel joint 513 may be fixedly coupled to the main body 501 of the swivel joint part 500, and the rotary swivel joint 511 may be fixedly coupled to the rod 530 such that the rod 530 is a rotary swivel joint. In conjunction with 511, the rotation angle may be rotated by a predetermined angle. The predetermined angle may be set larger than the center angle between the fasteners spaced apart along the circumferential direction at one end of the drill pipe 100 fastened to the rod 530.

Referring to FIG. 10A, the size of the center angle b of the recesses 511b and 513b may be larger than the size of the center angle a of the recesses 511a and 513a. Therefore, when the fixed swivel joint 513 and the rotary swivel joint 511 are engaged, the rotary swivel joint 511 by the difference between the center angle b of the recesses 511b and 513b and the center angle a of the recesses and recesses 511a and 513a. ) May rotate relative to the fixed swivel joint 513. That is, the difference between the angle of the center angle b of the recesses 511b and 513b and the center angle a of the recesses and protrusions 511a and 513a may be a preset angle.

Therefore, the difference between the center angle (b) of the grooves (511b, 513b) and the center angle (a) of the uneven portions (511a, 513a) is the center angle between the fasteners spaced apart along the circumferential direction at one end of the above-described drill pipe 100 It can be set larger.

For example, the difference between the center angle b of the recesses 511b and 513b and the center angle a of the recesses and recesses 511a and 513a may be 18 °, and the angle of 18 ° may be drilled. One of the fasteners spaced apart in the circumferential direction at one end of the pipe 100 may have a larger value than the center angle between fasteners that are angles formed with respect to the center of the drill pipe 100.

Accordingly, when the fixed swivel joint 513 and the rotary swivel joint 511 are engaged, the rotary swivel joint 511 may rotate with respect to the fixed swivel joint 513 within an angle range of 0 ° to 18 °. Accordingly, the rod 530 coupled with the rotary swivel joint 511 is rotated within a preset angle (0 ° to 18 ° angle) together with the rotary swivel joint 511, and the rod 530 and the drill pipe 100 are rotated. The fastening position can be matched so that fastening is possible through matching.

Meanwhile, as shown in FIG. 11, recessed portions 511b and 513b are provided with recessed regions on both sides contacting the recessed and projecting portions 511a and 513a so as to have a step, and a sliding member (not shown) in the recessed region. May be provided. For example, the sliding member may be provided with a bearing tape, and the fixed swivel joint 513 and the rotary swivel joint 511 are provided in the direction of gravity, so that only the recess 513b of the fixed swivel joint 513 provided below is provided. A sliding member may be provided.

The height of the sliding member provided in the recess 513b of the fixed swivel joint 513 is higher than the height of the step. Therefore, when the rotary swivel joint 511 and the fixed swivel joint 513 are engaged, the uneven portion 511a of the rotary swivel joint 511 is in direct contact with the sliding member, and the recess 513b of the fixed swivel joint 513 is different. Indirect contact with the sliding member. Accordingly, friction between the fixed swivel joint 513 and the rotary swivel joint 511 can be prevented, and the rotary swivel joint 511 can be rotated more smoothly by the sliding member.

On the other hand, the rotary swivel joint 511 that rotates by a predetermined interval with respect to the fixed swivel joint 513 is connected to the hydraulic cylinder 550 providing a rotational driving force can be rotated by the hydraulic cylinder 550.

In the conventional reverse circulation drilling rig, since the gear box unit is provided on the upper side of the drill pipe, the drill pipe 100 may also be rotated together by driving of the gear box unit, so that the drill pipe 100 and the swivel joint part 500 may be rotated. When the coupling was to rotate the drill pipe 100 was able to easily match the fastening position.

In the embodiment of the present invention, since the gear box unit 400 is provided below the drill pipe 100 so that the drill pipe 100 is not rotated, the rod 530 of the drill pipe 100 and the swivel joint part 500. It was difficult to match the fastening position so that the mated and fastened. However, by having the fixed swivel joint 513 and the rotary swivel joint 511 in the swivel joint part 500 as in the embodiment of the present invention, the rotary swivel joint 511 connected to the rod 530 is a predetermined angle range And the rod 530 is also rotated together with the rotary swivel joint 511 so that the rod 530 and the drill pipe 100 can be easily matched to each other so that the rod 530 can be engaged by mating. It can have an effect.

As described above, when the reverse circulation excavation device according to the embodiment of the present invention is used, the sealing unit is coupled to the gear box unit providing the driving force to the bit body unit, thereby maintaining the watertightness inside the gear box. Therefore, the gearbox unit can be arranged in the water even if the reverse circulation excavation device performs the excavation work underwater, and since the bit body unit and the gear box unit can be directly connected, the driving force of the bit body unit can be improved.

In addition, since a plurality of roller bits of the bit body unit for digging the dredging surface is provided spirally around the central axis, the slime generated by excavation by the bit body unit is guided to the spiral shape of the roller bit and discharged through the discharge hole. Can be.

In addition, since the gear box unit is directly connected to the bit body unit and positioned under the reverse circulation excavation device, the stability and verticality of the excavation work may be improved. Conventionally, when the gear box unit is located on top of the reverse circulation drilling rig and the gear box unit operates to rotate the bit body unit, the drill pipe provided between the gear box unit and the bit body unit can also rotate together. For this reason, as the reverse circulation excavation work progresses, vibrations are generated due to the rotation of the entire reverse circulation excavation device, thereby lowering the stability of the excavation work, and there is a problem in that the verticality is not kept constant.

However, as in the embodiment of the present invention, when the gear box unit is directly connected to the bit body unit and positioned below the reverse circulation drilling rig, only the bit body unit is rotated even if the gear box unit is operated to rotate the bit body unit. Therefore, the vibration due to the excavation work is significantly reduced, thereby improving stability, and maintaining the verticality of the excavation work.

As described above, the detailed description of the embodiment of the reverse circulation excavation device described the features of the reverse circulation excavation device according to the present invention on the background of the case used in the sea, but this is only an exemplary description and the reverse circulation according to the present invention. The excavation device can be used equally on land as well as at sea.

In particular, in reverse circulation excavation (RCD), in order to discharge the slime using water during excavation, the watertightness of the gear box unit 400 needs to be maintained the same as at sea as well as at sea. Therefore, the reverse circulation excavation device according to the embodiment of the present invention is not limited to the sea or the land, but can be used anywhere the reverse circulation excavation method is applied.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: drill pipe 110: discharge passage
130: air supply passage 200: stabilizer
300, 300 ': Bit body unit 310, 310': Roller bit
330, 330 ': discharge hole 400: gear box unit
410: gear box 420: main gear
430: auxiliary gear 450: sealing unit
451: wear ring 453: wear ring
455: seal housing 457: sealing member

Claims (19)

In the reverse circulation excavation device,
A plurality of drill pipes connected in the vertical direction;
A plurality of stabilizers provided along outer peripheries of the plurality of drill pipes to prevent horizontal movement of the plurality of drill pipes;
A bit body unit connected to the plurality of drill pipes connected thereto and having a plurality of roller bits for digging a dredging surface; And
It includes a gear box unit provided between the plurality of drill pipe and the bit body unit connected to transmit a driving force to the bit body,
The gear box unit,
And a sealing unit coupled to one side of the gear box unit to prevent water from penetrating into the gear box to improve the watertight holding force of the gear box unit. The method of claim 1,
The gear box unit,
A main gear coupled to an inner circumferential side of the gear box unit; And
And a plurality of auxiliary gears engaged with the main gears along the circumferential direction of the main gears. The method of claim 2,
The sealing unit,
An outer ring coupled to one inner circumference of the gear box unit and bolted to the main gear;
An inner wear ring coupled to an outer circumference of the outer wear ring and bolted to the main gear; And
It includes a seal housing coupled to the outer circumference of the inner wear ring bolted to one side of the gear box unit,
And a sealing member for maintaining watertightness between the outer wear ring and the inner wear ring and between the inner wear ring and the seal housing. The method of claim 3, wherein
The sealing member is an oil seal in which grease is injected,
The gear box unit is a reverse circulation excavation device which is further provided with a grease automatic injector for injecting the grease. The method of claim 4, wherein
And said sealing member is a "U" shaped packing. The method of claim 3, wherein
The inner wear ring and the seal housing are formed with a sealing groove in which the sealing member may be provided.
The sealing groove is a reverse circulation excavation device which is formed with a plurality of spaced apart from each other. The method of claim 3, wherein
The sealing member is provided with a plurality,
At least one of the sealing member is provided to withstand the internal pressure of the gear box unit,
At least one or more of the sealing member is capable of withstanding the external pressure of the gear box unit, it is provided with a reverse circulation excavation device which is provided to maintain the watertight. The method of claim 1,
The roller bit is a reverse circulating excavation device is provided with a plurality of the spiral is arranged on the side of the bit body unit facing the dredging surface with respect to the central axis of the bit body unit. The method of claim 8,
The bit body unit is a reverse circulation excavation device is formed with a discharge hole for discharging the excavated soil excavated by the roller bit. The method of claim 9,
The excavating earth is guided by the roller bit arranged in a spiral is discharged through the discharge hole is a reverse circulation excavation device. The method of claim 9,
The discharge hole is a reverse circulation excavation device connected to the drill pipe. The method of claim 11,
The drill pipe includes a discharge passage formed to be connected to the discharge hole along the central axis of the drill pipe; And
And an air supply passage formed to be symmetrical with respect to the discharge passage to supply air from the outside. The method of claim 1,
It is disposed on the upper side of the drill pipe, the reverse circulation excavating device further comprises a swivel joint part is rotatably provided for fastening through matching with the drill pipe. The method of claim 13,
The swivel joint part,
main body;
A rod provided at a lower portion of the main body and to which the drill pipe is detachably fastened;
A fixed swivel joint fixedly coupled to the main body;
A rotary swivel joint fixedly coupled to the rod and rotating relative to the fixed swivel joint; And
And a hydraulic cylinder for providing a rotational driving force to the rotary swivel joint. 15. The method of claim 14,
The rotary swivel joint is engaged with the fixed swivel joint to be rotatable by a predetermined angle,
The fixed swivel joint is a reverse circulation excavation device disposed below the rotary swivel joint. The method of claim 15,
The rotary swivel joint and the fixed swivel joint,
An uneven portion protruded from one side of the body to be spaced apart along the circumferential direction of the body; And
Includes a recess formed in the spaced space between the uneven portion,
And a convex-concave portion of the rotary swivel joint is engaged with the concave portion of the fixed swivel joint to be rotatable by the predetermined angle. 17. The method of claim 16,
And the predetermined angle is set to be greater than a center angle between fasteners spaced apart in one end of the drill pipe along the circumferential direction. 17. The method of claim 16,
The recessed portion is provided with a recessed area is formed to have a step on both sides in contact with the uneven portion, the reverse circulation excavation device provided with a sliding member in the recessed area. The method of claim 18,
And said sliding member is a bearing tape.

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