KR20140048721A - Drilling apparatus - Google Patents

Abstract

A drilling device comprises a guide device, a pilot bit part, and expandable wings. The guide device comprises: a device body having an air hole penetrated along a central axis and upper and lower body parts separated based on a piston part protruding from the central circumference; hanging protrusion parts formed on the lateral surface of the lower body part; and guide protrusion parts formed on the bottom of the lower body part. The pilot bit part comprises: a bit part body having a receiving groove for receiving the lower body part to be rotated, hanging sill parts protruding from the inner surface of the receiving groove to restrict the rotation of the lower body part due to the interaction with the hanging protrusion parts, and entrances for expandable wings arranged on the lateral surface; and multiple first rotary bits mounted on the bottom of the bit part body to be rotated. Each expandable wing comprises: a wing body inserted in one of the entrances for expandable wings and having a guide groove formed thereon to make the wing body draw into or out from the entrances for expandable wings by the interaction with the guide protrusion parts; and multiple second rotary bits mounted on the outer side of the wing body to be rotated.

Description

Drilling apparatus

The present invention relates to an excavation device, and more particularly to an excavation device provided in the hammer bit equipment used to construct a steel pipe underground.

When it is necessary to reinforce the ground to support the load of the upper structure at the construction sites such as buildings, ports, and roads, a method of making a solid foundation by inserting steel pipe into the ground and filling the inside of the steel pipe with concrete, etc. is used. . Hammer bit equipment is used to construct steel pipes underground. In general, the hammer bit equipment includes a rotating device, a striking device and a drilling device.

The method of constructing steel pipe underground by hammer bit equipment is roughly divided into reverse circulation drill (RCD) bit method and extended bit method. RCD bit method is a method of removing the excavated soil inside the steel pipe by directly injecting the steel pipe into the strata using a hammer, and sucked back the excavated soil inside the steel pipe using the RCD bit. Expansion bit method connects expansion bit and steel pipe by attaching casing shoe to expansion bit and welding casing shoe with steel pipe. Afterwards, the steel pipe is inserted by pulling down the steel pipe while giving an up and down impact through the hammer while the expansion bit is extended.

On the other hand, in order to press the steel pipe below the rock layer, the ground layer must be drilled wider than the outer diameter of the steel pipe. However, in the case of the conventional RCD bit method, it is difficult to extend the bit entered through the inside of the steel pipe. Even the technique of applying the bit extension method is often not able to lift after drilling because of the lack of rock drilling ability and the problem of shrinking to lift to the ground through the inside of the steel pipe after drilling. In this case, the extended bit technique can be used.

By the way, according to the conventional expansion bit method hits the expansion bit with the force of the vertical movement of the hammer piston to the downward excavation. Hammering requires a lot of air pressure bar oil has the disadvantage of rising costs. In order to reduce oil cost, the drilling bit is not hammered and the expansion bit is rotated to excavate, so that the expansion bit is not hit. Excavation does not progress.

United States Patent No. 5,787,999 (August 4, 1998 announcement)

An object of the present invention is to provide an excavation apparatus that can reduce the oil cost by being able to expand the drilling in the ground and drilling work by rotation.

Excavation device according to the present invention for achieving the above object is a device body formed with an upper shaft portion and a lower shaft portion around the piston portion through which the air hole penetrates along the central axis and protrudes along the center circumference, and the side of the lower shaft portion A guide device having a formed locking protrusion and a guide protrusion formed at a lower end of the lower shaft portion; An accommodation groove for rotatably receiving the lower shaft portion is formed, and a locking jaw portion for restricting rotation of the lower shaft portion is formed on the inner surface of the accommodation groove by restricting the rotation of the lower shaft portion, and a bit part in which entrances for expansion wings are formed on the side surface thereof. A pilot bit unit having a body, and a plurality of first rotating bits rotatably mounted at a lower end of the bit unit body; And a wing body inserted into the expansion wing entrances, respectively, and a guide groove is formed in the wing body to draw out or pull out the wing body through the expansion wing entrance through interaction with the guide protrusion. It includes; extending wings having a second rotational bit rotatably mounted to the lead portion of the wing body.

According to the present invention, the ground layer can be crushed and drilled only by the rotation of the pilot bit portion without hitting the pilot bit portion up and down by hammering. In addition, it is possible to expand the perforation by the rotation of the second rotary bit by expanding the expansion wings in the ground, and to advance the perforation by the rotation at the same time as the perforation expansion. As a result, the oil cost can be reduced.

1 is a cross-sectional view of an excavation device according to an embodiment of the present invention.
2 is a perspective view of the guide device of FIG.
3 is an exploded perspective view of the pilot bit unit of FIG.
4 is a cross-sectional view of FIG. 3.
5 is a perspective view of the expansion wing of FIG.
6 is an exploded perspective view of the extension wing of FIG. 5;
7 and 8 are views for explaining a pull-out operation example of the expansion wing of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of an excavation device according to an embodiment of the present invention. FIG. 2 is a perspective view of the guide device of FIG. 1. FIG. 3 is an exploded perspective view of the pilot bit unit of FIG. 1. 4 is a cross-sectional view of FIG. 3. 5 is a perspective view of the expansion wing of FIG. 1. 6 is an exploded perspective view of the expansion wing of FIG. 5.

1 to 6, the excavator includes a guide device 110, a pilot bit portion 120, and expansion wings 130.

The guide device 110 includes a device body 111, a locking protrusion 115, and a guide protrusion 116. The air hole 117 is formed through the device body 111 along the central axis. The air hole 117 receives high pressure air from the outside. The device body 111 has an upper shaft portion 113 and a lower shaft portion 114 formed around the piston portion 112 protruding along the center circumference.

The piston portion 112 has a larger diameter than the upper shaft portion 113 and the lower shaft portion 114. The piston part 112 serves to pull the steel pipe 10 into the hole while pushing the upper end of the casing shoe 11 coupled to the lower end of the steel pipe 10 downward. On the outer circumferential surface of the piston 112, a plurality of discharge grooves for discharging sludge such as soil or gravel generated during the excavation process may be formed.

The upper shaft 113 rotates by the rotary drive device and moves up and down by the lift drive device, thereby enabling the guide device 110 to rotate and / or move up and down. The lower shaft portion 114 may have a diameter lower than that of the upper portion. A pin groove 114a to which the ring-shaped pin 118 is fastened along the outer circumferential surface may be formed at an upper portion of the lower shaft portion 114. The ring-shaped pin 118 is also fastened to the pin groove 124 formed on the inner circumferential surface of the bit body 121, so that the pilot bit portion 120 is not separated from the guide device 110 in the vertical direction.

The locking protrusion 115 is formed at the side of the lower shaft 114. The locking protrusion 115 may interact with the locking jaw portion 123 formed on the inner surface of the receiving groove 122 of the bit body 121 to limit the rotation of the lower shaft 114. The locking protrusion 115 may include three locking protrusions 115a spaced at equal intervals. The locking jaw 123 may include three locking jaws 123a spaced at equal intervals. The locking projections 115a at the time of rotation of the lower shaft portion 114 have a size that can be moved in each of the spaces formed between the locking jaws 123a. Accordingly, the guide device 110 may be limited to forward and reverse rotation only up to a certain angle with respect to the pilot bit unit 120.

Guide protrusion 116 is formed at the bottom. The guide protrusion 116 may have the same number of guide protrusions 116a as the number of the extension wings 130. Each of the guide protrusions 116a may have a curved shape with a radius gradually increasing from the center of the lower shaft portion 114 to the outside. When the extension wings 130 are disposed at equal intervals, the guide protrusions 116a may be disposed at equal intervals.

The pilot bit portion 120 includes a bit portion body 121 and a plurality of first rotating bits 126. The bit part body 121 is provided with a receiving groove 122 for rotatably accommodating the lower shaft portion 114. A locking jaw portion 123 is formed on the inner surface of the accommodation groove 122. In addition, the pin groove 124 is formed on the inner surface of the accommodation groove 122 to correspond to the pin groove 114a of the lower shaft portion 114. An air hole 121a may be formed in the bit body 121 to communicate with the air hole 117 of the device body 111. The sludge discharge groove 121b may be formed at the side of the bit part body 121.

The bit part body 121 may be formed to have a diameter smaller than the diameter of the piston part 112. Accordingly, the upper end of the casing shoe 11 disposed around the bit part body 121 corresponds to the lower end of the piston part 112, whereby the piston part 112 pushes the upper end of the casing shoe 11 downward. The steel pipe 10 can be dragged down into the perforation. Sides of the bit part body 121 is formed with the entrance 125 for the expansion wing.

The first rotation bits 126 are rotatably mounted at the lower end of the bit body 121. When the bit body 121 is rotated by the rotation of the guide device 110, the first rotation bits 126 are respectively mounted at the bottom of the bit body 121 to enable smooth rotation. When the bit body 121 is rotated while the first rotating bits 126 are in contact with the ground layer, the first rotating bits 126 are rotated by friction with the ground layer. Can proceed. Since the first rotation bit 126 breaks the ground layer while rotating, the first rotation bit 126 may receive a small load when the ground layer is broken. The first rotation bit 126 may have button tips 126a formed on an outer surface thereof to increase the crushing effect.

The first rotation bits 126 may be mounted to the bit body 121 in a form where the rolling surface is inclined with respect to the horizontal surface. Accordingly, the first rotation bits 126 may increase the effect of crushing the ground layer while taking a smaller load during rotation.

The extension wings 130 have a wing body 131 and a second rotating bit 136, respectively. The wing body 131 is inserted into the expansion wing entrance 125 and slides to be withdrawn or drawn through the expansion wing entrance 125. The second rotation bit 136 is rotatably mounted to the lead portion of the wing body 131. For example, an inclined surface may be formed at the bottom outer edge of the wing body 131, and a mounting groove 132 for mounting the second rotation bit 136 may be formed on the inclined surface.

The second rotary bit 136 may have a bit rotation axis 137, a bit roller 138, and button tips 139. Bit rotation shaft 137 is installed in the mounting groove 132 of the wing body 131, the outer end is higher than the inner end. The bit roller 138 is rotatably installed on the bit rotation shaft 137 and is formed to partially protrude from the mounting groove 132. Accordingly, the bit rollers 138 may be disposed with the rolling surface inclined with respect to the side of the perforation. Accordingly, the second rotation bit 136 may increase the effect of crushing the lateral strata of the perforation while the load is smaller during rotation.

The button tips 139 may be formed on the circumferential and outer sides of the bit roller 138. Since the rolling surface of the bit roller 138 is inclined with respect to the side of the perforation, when the wing body 131 is expanded, the outer side of the bit roller 138 first contacts the side strata of the perforation. As the button tips 139 formed on the outer side of the bit roller 138 begin to break the lateral strata of the perforations first, the load on the bit roller 138 can be further reduced.

The wing body 131 is formed with a guide groove 133 which draws or draws out the wing body 131 through the door 125 for the expansion wing by interacting with the guide protrusion 116a. The guide groove 133 has a shape in which the guide protrusion 116a is inserted and guided to slide the wing body 131 according to the rotation of the guide protrusion 116a. This will be described below with reference to FIGS. 7 and 8.

As illustrated in FIG. 7, the guide protrusions 116a are in contact with the locking jaws 123a of the pilot bit portion so that the locking protrusions 115a of the guide device 110 can no longer rotate counterclockwise. Are positioned in the guide grooves 133 such that the extension wings 130 are retracted into the pilot bit portion 120.

In this state, as shown in FIG. 8, when the locking projections 115a of the guide device 110 rotate clockwise in a state where the rotation of the pilot bit portion 120 is suppressed by the frictional force with the ground layer, the guide The protrusions 116a are guided by the guide grooves 133 while rotating together with the locking protrusions 115a to allow the extension wings 130 to be pulled out of the pilot bit part 120. At this time, when the locking projections 115a abut against the locking jaws 123a such that they do not rotate in the clockwise direction, the extension wings 130 are drawn out to the maximum. Meanwhile, although three extension wings 130 are illustrated as being provided, it is also possible to provide one, two, four, or more.

For example, the process of excavating the ground layer by the excavating device having the above-described configuration will be described with reference to FIGS. 1 to 8.

First, the piston part 112 of the guide device 110 is inserted into the steel pipe 10, and the casing shoe 11 is disposed around the upper side of the pilot bit part 120 to be coupled to the lower end of the steel pipe 10. In addition, the engaging projections 115a of the guide device 110 abut against the locking jaws 123a of the pilot bit portion 120 so that the locking projections 115a do not rotate in the counterclockwise direction so that the extension wings 130 are connected to the pilot bit portion ( 120). When the guide bit 110 is rotated counterclockwise in a state where the pilot bit part 120 is brought into contact with the ground, the pilot bit part is maintained while the extension wings 130 remain in the pilot bit part 120. 120 rotates integrally with the guide device 110. In this process, as the ground layer is broken by the rotation of the first rotation bits 126, the drilling operation is performed. As the drilling operation continues, the drilling apparatus descends along the drilling hole, and the steel pipe 10 is also pushed down by the piston part 112.

Subsequently, when the ground layer is to be drilled wider than the outer diameter of the steel pipe 10 in the ground, the guide device 110 is rotated in the clockwise direction. At this time, since the rotation of the pilot bit unit 120 is suppressed by the frictional force with the ground layer, the locking protrusions 115a of the guide device 110 are gradually deviated from the locking jaws 123a. Accordingly, the guide protrusions 116a are also moved along the guide grooves 133 such that the extension wings 130 are gradually drawn out from the pilot bit part 120. Since the extension wings 130 are rotated at the same time as they are drawn out from the pilot bit part 120, the inner diameter of the perforations may be gradually widened while the side strata of the perforations are broken by the rotation of the second rotation bits 136.

Thereafter, when the extension wings 130 are to be returned to lift the excavator from the steel pipe 10 to the outside, the guide device 110 is raised while rotating in the counterclockwise direction. Then, the upper surface of the expansion wings 130 is in contact with the lower end of the casing shoe 11, the rotation of the expansion wings 130 is suppressed by the friction force. In this state, when the guide device 110 continues to rotate in the counterclockwise direction, the guide protrusions 116a move along the guide grooves 133 to introduce the extension wings 130 into the pilot bit portion 120. do. When the locking protrusions 115a are brought into contact with the locking jaws 123a so that they cannot rotate in the counterclockwise direction, the extension wings 130 are fully inserted into the pilot bit part 120. Then, the pilot bit portion 120 is in a state that can be inserted into the steel pipe 10, the pilot bit portion 120 is external from the steel pipe 10 together with the guide device 110 when the guide device 110 is raised. Can be salvaged.

As described above, the ground layer may be crushed and drilled only by the rotation of the pilot bit unit 120 having the first rotation bit 126 without hitting the pilot bit unit 120 by hammering. In addition, by expanding the extension wings 130 in the ground can be expanded by the rotation of the second rotary bit 135, it is possible to advance the drilling by the rotation at the same time as the drilling expansion. As a result, the oil cost can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10. Steel pipe 11. Casing shoe
110..Guide device 112..Piston part
115..Jump protrusion 116..Guide protrusion
120. Pilot bit section 123. Jamming jaw section
125..Exit for extension wing 126..1st rotating bit
130..Extension wing 133..Guide groove
136..2nd rotation bit

Claims (3)

An air hole penetrates along a central axis and a device body having an upper shaft portion and a lower shaft portion formed around a piston portion protruding along a center circumference, a locking protrusion formed on a side of the lower shaft portion, and a guide protrusion formed at a lower end of the lower shaft portion. A guide device provided;
An accommodation groove for rotatably receiving the lower shaft portion is formed, and a locking jaw portion for restricting rotation of the lower shaft portion is formed on the inner surface of the accommodation groove by restricting the rotation of the lower shaft portion, and a bit part in which entrances for expansion wings are formed on the side surface thereof. A pilot bit unit having a body, and a plurality of first rotating bits rotatably mounted at a lower end of the bit unit body; And
The wing body having a wing body respectively inserted into the expansion wing entrances, the guide body is formed in the wing body for the drawing or withdrawal operation of the wing body through the entrance for the expansion wing by interacting with the guide projection, the wing Expansion wings having a second rotational bit rotatably mounted to a lead-out portion of the body;
Excavator comprising a. The method of claim 1,
The second rotation bit,
A bit rotation shaft provided with an outer end higher than an inner end in a mounting groove of the wing body;
A bit roller rotatably installed on the bit rotation shaft and formed to partially protrude from the mounting groove, and
And a button tip formed on a circumferential surface and an outer side of the bit roller. The method of claim 1,
The first rotating bits are excavating apparatus, characterized in that each of the rolling surface is mounted on the body of the bit portion in a form inclined with respect to the horizontal plane.

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