KR102669178B1 - Connection apparatus of steel pipe to ring bit, reinforcement apparatus of direct boring and it's installation method - Google Patents

Abstract

The present invention relates to a ring bit and a steel pipe connecting device, a direct drilling reinforcement device, and a method of installing the same, a ring bit in which a pilot connected to a power means can be detachably coupled and capable of drilling a drilling surface, and the ring bit rotates. It includes a shoe that can be coupled to the shoe, a steel pipe portion that is connected to the shoe and can move along the ring bit and through which the rod of the power means can penetrate, and a shoe key member that couples the shoe and the steel pipe portion.
The inner circumferential diameter of the shoe key member is larger than the outer circumferential diameter of the shoe, and at least a portion of the shoe key member is broken and retracted between the shoe and the steel pipe portion to come into close contact with the steel pipe portion.

Description

Ring bit and steel pipe connection device, direct boring reinforcement device and its installation method {Connection apparatus of steel pipe to ring bit, reinforcement apparatus of direct boring and it's installation method}

The present invention relates to a ring bit and steel pipe connecting device, a straight drilling reinforcement device, and a method of installing the same.

In general, grout or grouting refers to the injection of filler into cracks and cavities in the ground for water leak prevention work or soil stability in civil engineering work, and the filler (also called 'grout material') is charged using gravity or a pump.

This grouting method installs a steel pipe in the ground, installs a packer inside the steel pipe, injects grout material and solidifies it, making the steel pipe and the ground one, and increases the shear strength of the soil and rock. The injection is carried out inside the steel pipe. Therefore, it is a very advantageous construction method in terms of constructability and economic feasibility.

Typically, the steel pipe grouting method consists of drilling the ground, inserting a steel pipe with a strainer installed into the drilling hole, inserting a sealing material between the steel pipe and the drilling hole, and injecting cement while installing the packer. However, since this method inserts the steel pipe after drilling, it is less practical in soft soil ground where the drill hole is difficult to maintain because it makes insertion of the steel pipe difficult due to the collapse of the drill hole and the mixing of foreign substances.

To solve this problem, a direct perforation method has been proposed in which a steel pipe is inserted simultaneously with perforation.

The straight drilling device includes a bit that pierces the perforation surface, a shoe that connects the steel pipe and the bit, and a rod that penetrates the steel pipe and is detachably connected to the bit as a pilot. The rod transmits the rotational force generated by the drive device to the bit through the pilot, allowing the bit to rotate. As the bit rotates, it pierces the perforation surface to form a perforation hole, and the steel pipe is inserted into the perforation hole along the bit. When the steel pipe is inserted to the set depth, the pilot is separated from the bit and discharged out of the steel pipe along with the rod.

Meanwhile, steel pipes are standardized and produced to certain specifications. If the depth of the drilling hole is deeper than the length of the standardized steel pipe, it is necessary to connect the standardized steel pipe to insert the steel pipe. The connection of the steel pipes was made by welding. And the shoes and steel pipes are also joined by welding on site.

The on-site welding method required the inconvenience of installing welding equipment and required a lot of work time for welding.

Republic of Korea Patent Publication No. 10-2020-0079384 (2020.07.03.) Republic of Korea Registered Utility Model No. 20-0352180 (May 24, 2004)

The present invention provides a technology that can improve installation efficiency by quickly and easily connecting the bit that perforates the perforation surface and the steel pipe section at the direct drilling site.

A straight drilling reinforcement device according to an embodiment of the present invention includes a ring bit capable of drilling a drilling surface and a pilot connected to a power means being detachably coupled, a shoe to which the ring bit is rotatably coupled, and It includes a steel pipe part that is connected to the shoe and can move along the ring bit and through which the rod of the power means can penetrate, and a shoe key member that couples the shoe and the steel pipe part.

The inner circumferential diameter of the shoe key member is larger than the outer circumferential diameter of the shoe, and at least a portion of the shoe key member may be broken and retracted between the shoe and the steel pipe portion to come into close contact with the steel pipe portion.

A shoe key groove in which the shoe key member is located is formed on the outer circumference of the shoe along the circumferential direction, and the bottom of the shoe key groove and the inner circumference of the shoe key member are formed as inclined surfaces and are concave so that the inner circumference of the shoe key groove is formed. It may get caught on the floor.

The depth of the shoe keyway may decrease from one side of the shoe to the other, and the thickness between the outer and inner circumferences of the shoe key member may become thinner from one side to the other.

The steel pipe unit may include a plurality of steel pipes, a connection part connecting adjacent steel pipes, and a steel pipe key member combining the connection part and the steel pipe.

The inner circumferential diameter of the steel pipe key member is larger than the outer circumferential diameter of the connection portion, and at least a portion of the steel pipe key member may be broken and retracted between the connection portion and the steel pipe to come into close contact with the steel pipe.

The connection part may include an insertion tube inserted into an adjacent steel pipe, and a flange formed around the outside of the insertion tube and in contact with an end of the steel pipe.

The steel pipe key member may be located between the insertion pipe and the steel pipe.

A steel pipe key groove in which the steel pipe key member is located is formed along the circumferential direction on the outer circumference of the insertion pipe. The bottom of the steel pipe key groove and the inner circumference of the steel pipe key member are formed as inclined surfaces, and the steel pipe key member is retracted. The inner circumference may be caught at the bottom of the steel pipe keyway.

The woven perforation reinforcement device may further include a coupling member disposed between the ring bit and the shoe to rotatably connect the ring bit and the shoe.

A ring bit and steel pipe connecting device according to an embodiment of the present invention connects a ring bit that perforates a perforated surface and a steel pipe inserted into the perforated surface along the ring bit, and the ring bit is rotatably coupled. It includes a shoe to which the steel pipe can be connected, and a shoe key member disposed between the shoe and the steel pipe to rotatably couple the ring bit and the shoe.

The inner circumferential diameter of the shoe key member is larger than the outer circumferential diameter of the shoe, and a shoe key groove in which the shoe key member is located is formed along the circumferential direction on the outer circumference of the shoe, and the bottom of the shoe key groove and the shoe. The inner circumference of the key member is formed as an inclined surface, and at least a portion of the shoe key member may be broken and retracted between the bottom of the shoe key groove and the steel pipe to come into close contact with the steel pipe.

A method of installing a straight hole reinforcement device according to an embodiment of the present invention includes the steps of placing a shoe key member, a portion of which is cut off to form an opening, in a shoe key groove formed in a shoe, retracting the shoe key member, and placing the shoe key member at a location where the shoe key member is located. It includes inserting a portion of the shoe into the interior of the steel pipe and combining the shoe with a ring bit.

The retracted shoe key member is spread between the steel pipe and the bottom of the shoe key groove so that its outer circumference is in contact with the inner circumference of the steel pipe.

The method of installing the straight perforation reinforcement device may further include the step of extending the length of the steel pipe.

The step of extending the length of the steel pipe includes forming a steel pipe keyway on the other end of the first steel pipe, one end of which is connected to the shoe, to join one side of the connection where the steel pipe key member is located, and forming a steel pipe keyway on one end of the second steel pipe. It may include the step of coupling the other side of the connection where the steel pipe key member is located.

The steel pipe key member is retracted to insert the connection part into the interior of the steel pipe, and the retracted steel pipe key member is spread between the steel pipe and the connection part so that the outer circumference is in contact with the inner circumference of the steel pipe.

The method of installing the direct drilling reinforcement device includes the steps of combining a pilot connected to a rod powered from a power means with a ring bit, drilling the perforated surface so that the steel pipe is inserted into the perforated surface, and then drilling the perforated surface. The method may further include removing the pilot separately from the ring bit and injecting grout material into the steel pipe inserted into the perforated surface.

According to an embodiment of the present invention, a shoe and a steel pipe coupled to a ring bit are joined using a shoe key member at a straight drilling site. Since the shoe and the steel pipe are not joined using the conventional welding method, there is no need to prepare a welding device at the direct drilling site, so the shoe and the steel pipe can be joined quickly and easily.

1 is a schematic diagram showing a woven perforation reinforcement device according to an embodiment of the present invention.
Figure 2 is an enlarged view of portion A of Figure 1.
Figure 3 is an exploded cross-sectional view of Figure 2.
Figure 4 is an exploded view of the shoe key member and steel pipe portion of Figure 3.
Figure 5 is an enlarged view of a portion of the steel pipe part of Figure 1.
Figure 6 is an enlarged view of part B of Figure 5.
Figure 7 is a perspective view showing the disassembled state of Figure 5.
Figure 8 is a block diagram showing a method of installing a straight perforation reinforcement device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Throughout the specification, similar parts are given the same reference numerals.

The ring bit and steel pipe connecting device according to an embodiment of the present invention can be applied to the straight drilling reinforcement device, which is an embodiment of the present invention. Hereinafter, the description will focus on the straight drilling reinforcing device to which the steel pipe connecting device is applied.

Then, a woven hole reinforcement device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

Figure 1 is a schematic diagram showing a woven perforation reinforcement device according to an embodiment of the present invention, Figure 2 is an enlarged view of portion A of Figure 1, Figure 3 is an exploded cross-sectional view of Figure 2, and Figure 4 is a shoe key of Figure 3. It is an exploded view of the member and the steel pipe portion. Figure 5 is an enlarged view of a portion of the steel pipe portion of Figure 1, Figure 6 is an enlarged view of portion B of Figure 5, and Figure 7 is a perspective view showing the exploded state of Figure 5.

Referring to Figures 1 to 7, the straight drilling reinforcement device 100 includes a ring bit consisting of a ring bit 10, a shoe 20, and a shoe key member 40, a steel pipe connection device, and a steel pipe portion 50. The goal is to improve installation efficiency by enabling quick and easy connection between the bit that drills the perforated surface and the steel pipe section at the direct drilling site.

The ring bit 10 includes a body 11 and a tip 12, and can form a drilling hole by processing the drilling surface while rotating.

The interior of the body 11 is penetrated along the longitudinal direction. A flange 111 is formed along the circumferential direction on one outer circumference of the body 11. The inner and outer edges of one side of the flange 111 are inclined surfaces.

An inner locking groove 112 having a first deep groove 112a and a second deep groove 112b is formed along the circumferential direction on the other outer periphery of the body 11. The bottom of the first deep groove 112a and the bottom of the second deep groove 112b are connected by an inclined surface. Based on the outer peripheral surface of the body 11, the depth h2 of the second deep groove 112b is smaller than the depth h1 of the first deep groove 112a. Here, the depth h2 of the second depth groove 112b may be half of the depth h1 of the first depth groove 112a.

A protruding key 113 protrudes from the pierced inner circumference of the body 11. A plurality of protruding keys 113 are formed at intervals along the inner circumference of the body 11.

The tips 12 protrude from the inclined surface of the flange 111 perpendicular to the inclined surface and are arranged in plurality at intervals along the circumferential direction. The tip 12 can process the perforated surface by rotating the body 11.

Meanwhile, a pilot 1 connected to a power means (not shown) through a rod 2 may be located inside the body 11. The pilot (1) is coupled with the protruding key (113). A guide groove (not shown) into which the protruding key 113 is inserted along the longitudinal direction is formed in the pilot (1), and a locking groove (not shown) into which the protruding key 113 is inserted along the outer circumference of the pilot (1) is formed at the end of the guide groove. (not shown) is formed. With the protruding key 113 located at the end of the guide groove, if the pilot 1 rotates in the opposite direction in which the locking groove is formed, the protruding key 113 may be inserted into the locking groove and become locked.

The power means generates rotational force using oil, compressed air, etc., and the rotational force is transmitted to the ring bit 10 through the rod 2 and the pilot 1, so that the ring bit 10 can rotate. The power means may apply impact to the pilot (1) through the rod (2) in addition to the rotational force.

The interior of the shoe 20 is penetrated along the longitudinal direction so that the pilot 1 can penetrate therethrough. The other side of the body 11 is inserted into one side of the shoe 20. One side of the shoe 20 faces the other side of the flange 111.

An outer locking groove 21 that matches the inner locking groove 112 is formed on one inner circumference of the shoe 20. The outer locking groove 21 is formed along the inner circumference of one side of the shoe 20. Here, the depth dimension h3 of the outer locking groove 21 is equal to the depth dimension h2 of the second depth groove 112b based on the inner peripheral surface of one side of the shoe 20.

A coupling member 30 is disposed in the inner locking groove 112 and the outer locking groove 21 to prevent separation of the shoe 20 and the body 11. The coupling member 30 is formed in a ring shape, and a portion thereof is broken to form an opening (not shown). When an external force is applied to the coupling member 30, the gap between the openings is narrowed and the coupling member 30 may be compressed. The inner circumferential diameter of the coupling member 30 is larger than the outer circumferential diameter of the other side of the body 11. The body 11 and the shoe 20 are coupled to each other in a closed state by placing the coupling member 30 in the first deep groove 112a. The compressed coupling member 30 generates elastic force and can be expanded by the elastic force to come into close contact with the inner circumference of the shoe 20. At this time, the inner circumference of the coupling member 30 may be located in the inner locking groove 112 and the outer circumference may be located in the outer locking groove 21. And according to the operation of the ring bit 10, the coupling member 30 may be located in the second deep groove 112b and connected to the outer locking groove 21.

The ring bit 10 and the shoe 20 are coupled by the coupling member 30 and are not separated. And when rotational force is transmitted through the pilot (1), the ring bit (10) can rotate. At this time, the shoe 20 may be fixed by an external force and may not rotate. However, the shoe 20 to which no external force is applied may rotate along the ring bit 10.

The outer circumference of the shoe 20 may be divided into one side and the other side by a virtual reference line, and the outer circumference diameter of the other side is smaller than the outer circumference diameter of one side. Accordingly, a step 22 is formed between them. The other side of the shoe 20 is inserted into the steel pipe portion 50. As the step 22 contacts the steel pipe portion 50, the shoe 20 is no longer inserted into the steel pipe portion 50.

A shoe keyway 23 is formed along the circumferential direction on the outer periphery of the other side of the shoe 20. The bottom of the shoe keyway 23 is formed as an inclined surface. The depth h4 of the bottom of the shoe keyway 23 becomes smaller as it moves from one side of the shoe 20 in the direction x to the other side of the shoe 20 due to an inclined surface. A plurality of shoe keyways 23 are formed on the outer circumference of the shoe 20 at intervals in the longitudinal direction.

The shoe key member 40 is disposed between the shoe 20 and the steel pipe portion 50 and couples the shoe 20 and the steel pipe portion 50 without separation. The shoe key member 40 is formed in the shape of a circular band, and a portion thereof is broken to form an opening 41. The shoe key member 40 can be retracted by applying an external force as the gap between the openings 41 is narrowed.

The outer circumference of the shoe key member 40 is formed as a flat surface, and the inner circumference is formed as an inclined surface corresponding to the bottom of the shoe key groove 23. However, the shoe key member 40 has a circular cross-sectional shape and a coil spring structure may be applied.

Accordingly, the thickness between the inner and outer circumferences of the shoe key member 40 is formed to become thinner as it goes from one side to the other side. The inner circumferential diameter of the shoe key member 40 is larger than the outer circumferential diameter of the other side of the shoe 20 based on the thickest part. Accordingly, the other side of the shoe 20 can be easily inserted into the shoe key member 40.

The shoe key member 40 is located in the shoe key groove 23 in a retracted state. At this time, elastic force is generated in the shoe key member 40, the inner circumference is in contact with the bottom of the shoe key groove 23, and one side of the shoe 20 can be inserted into the steel pipe portion 50.

When the external force is removed from the retracted shoe key member 40, the shoe key member 40 in which the elastic force occurred returns to its original state, and the outer circumference can be brought into close contact with the inner circumference of the steel pipe portion 50. And the sloping inner circumference of the shoe key member 40 can be caught while contacting the sloping bottom of the shoe key groove 23. The outer circumference of the shoe key member 40 is elastically adhered to the inner circumference of the steel pipe portion 50, so that the shoe 20 and the steel pipe portion 50 can be coupled. Accordingly, the shoe 20 and the steel pipe portion 50 can be quickly and easily combined at the direct drilling site without using a welding method.

Since the shoe key member 40 is disposed in each shoe key groove 23, the coupling force between the shoe 20 and the steel pipe portion 50 can be further increased.

Meanwhile, a locking protrusion (not shown) in contact with one surface of the shoe key member 40 may be formed around the inner circumference of the steel pipe portion 50 in contact with the shoe key member 40. When the shoe 20 is inserted into the steel pipe portion 50, the shoe key member 40 maintains a retracted state and is not caught in the locking protrusion. However, as the shoe key member 40 returns to its original state, the outer circumference comes into contact with the inner circumference of the steel pipe portion 50, and one surface of the shoe key member 40 may be caught in the catch. As the locking protrusion is caught by the shoe key member 40, the steel pipe portion 50 is not separated from the shoe 20 and can remain more firmly coupled.

In FIGS. 1 to 4, it is shown that there are two shoe key members 40 and shoe key grooves 23, but the number of shoe key members 40 and shoe key grooves 23 may be one or two or more. The number of shoe key members 40 and shoe key grooves 23 may vary depending on the design of the straight perforation guarantee device.

The steel pipe portion 50 includes a plurality of steel pipes, a connection portion 52, and a steel pipe key member 53.

The plurality of steel pipes consists of a first steel pipe (51a) and a second steel pipe (51b). The number of steel pipes may vary depending on the depth of the straight hole. One end of the first steel pipe 51a is connected to the shoe 20. The second steel pipe 51b is connected to the first steel pipe 51a through a connection portion 52. The rod 2 is located inside the first steel pipe 51a and the second steel pipe 51b and is connected to the pilot 1. The first steel pipe 51a is connected to the shoe 20 and can be inserted into the perforation surface along the ring bit 10.

The connection portion 52 includes an insertion tube 521 and a flange 522.

The insertion tube 521 is penetrated in the longitudinal direction, and one side is inserted into the first steel pipe 51a and the other side is inserted into the second steel pipe 51b.

The flange 522 is formed along the circumferential direction around the central outer circumference of the insertion tube 521. The ends of the first steel pipe 51a and the second steel pipe 51b are in contact with the flange 522, so the insertion pipe 521 inserted into the first steel pipe 51a and the second steel pipe 51b is not biased.

Steel pipe keyways 521a are formed along the circumferential direction on the outer periphery of one side and the other side of the insertion pipe 521. The steel pipe keyways 521a formed on the outer periphery of both sides are symmetrical with respect to the flange 522. The bottom of the steel pipe keyway 521a forms an inclined surface. Due to the inclined surface, the depth dimension of the steel pipe keyway 521a becomes smaller as it moves away from the flange 522 based on the outer peripheral surface of the insertion pipe 521. A plurality of steel pipe keyways 521a are formed at intervals along the longitudinal direction of the insertion pipe 521.

The steel pipe key member 53 is disposed between the insertion pipe 521 and the first and second steel pipes 51a and 51b to couple the insertion pipe 521 and the first and second steel pipes 51a and 51b. The steel pipe key member 53 is located in the steel pipe keyway 521a.

The outer circumference of the steel pipe key member 53 is formed as a flat surface, and the inner circumference is formed as an inclined surface corresponding to the bottom of the steel pipe keyway 521a. Accordingly, the thickness dimension between the inner and outer circumferences of the steel pipe key member 53 becomes thinner as the distance from the flange 522 increases.

The steel pipe key member 53 is formed in a circular band shape, and a portion thereof is broken to form an opening 531. When an external force is applied to the steel pipe key member 53, the gap between the openings 531 is narrowed and the steel pipe key member 53 can be retracted.

At this time, elastic force is generated in the steel pipe key member 53, the inner circumference is in contact with the bottom of the steel pipe keyway 521a, and the insertion pipe 521 can be inserted into the first and second steel pipes 51a and 51b.

When the external force is removed from the retracted steel pipe key member 53, the steel pipe key member 53 in which the elastic force occurred returns to its original state, and its outer circumference may come into close contact with the inner circumference of the first and second steel pipes 51a and 51b.

In addition, the inclined inner circumference of the steel pipe key member 53 may be caught while contacting the inclined bottom of the steel pipe keyway 521a. The outer circumference of the steel pipe key member 53 is elastically adhered to the inner circumference of the first and second steel pipes 51a and 51b, so that the insertion tube 521 and the first and second steel pipes 51a and 51b can be coupled. Accordingly, the first and second steel pipes 51a and 51b can be quickly and easily joined at the direct drilling site without using a welding method.

Since the steel pipe key member 53 is disposed in each steel pipe keyway 521a, the coupling force between the insertion pipe 521 and the first and second steel pipes 51a and 51b can be further increased.

Next, the installation method of the straight perforation reinforcement device will be described with reference to FIG. 8.

Figure 8 is a block diagram showing a method of installing a straight perforation reinforcement device according to an embodiment of the present invention.

The method of installing the straight perforation reinforcement device includes the steps of placing a shoe key member in the shoe key groove of the shoe (S10), retracting the shoe key member (S20), combining the shoe and the steel pipe (S30), and combining the ring bit and the shoe. Includes a combining step (S40). The method of installing the straight perforation reinforcement device includes extending the length of the steel pipe (S50), combining the pilot and the ring bit (S60), drilling the perforated surface (S70), and separating the pilot from the ring bit (S80). ) and may further include the step of injecting grout material into the interior of the steel pipe (S90).

In the step of placing the shoe key member in the shoe key groove of the shoe (S10), the shoe 20 and the shoe key member 40 are combined. Since the inner circumferential diameter of the shoe key member (40) is larger than the outer circumferential diameter of the other side of the shoe (20), the other side of the shoe (20) is inserted into the inside of the shoe key member (40) and the shoe key member (40) is connected to the shoe key groove. Place it at (23).

In the step of retracting the shoe key member (S20), the shoe key member 40 is retracted using a tool such as a compression device or clamp. At this time, the shoe key member 40 is retracted by the gap between the openings 41 and its inner circumference is in contact with the inner circumference of the shoe key groove 23. And the outer circumferential diameter of the shoe key member 40 is equal to the outer circumferential diameter of the other side of the shoe 20.

In the step of combining the shoe and the steel pipe (S30), the other side of the shoe 20 is inserted into the interior of the steel pipe while the shoe key member 40 is retracted. As the external force compressing the shoe key member 40 is removed, the shoe key member 40 returns to its original state by elastic force, and the outer circumference comes into elastic contact with the inner circumference of the steel pipe. The sloping inner perimeter of the shoe key member 40 is in contact with the sloping bottom of the shoe key groove 23. As the shoe key member (40) moves to the lower part of the shoe key groove (23), the shoe key member (40) is inserted between the bottom of the shoe key groove (23) and the inner circumference of the steel pipe, so that the shoe (20) and the steel pipe are firmly connected. It is fixed.

In the step of combining the ring bit and the shoe (S40), the other side of the ring bit 10 is inserted into one side of the shoe 20 to couple the ring bit 10 and the shoe 20. At this time, the coupling member 30 is placed in the inner locking groove 112 and retracted, and the portion of the ring bit 10 where the coupling member 30 is located is inserted into the shoe 20. When the external force that retracts the coupling member 30 is removed, the coupling member 30 returns to its original state and its outer circumference is located in the outer locking groove 21. When the inner part of the coupling member 30 is located in the inner locking groove 112 and the outer part is located in the outer locking groove 21, the ring bit 10 is rotatably coupled to the shoe 20.

In the step of extending the length of the steel pipe (S50), the length of the steel pipe can be extended by considering the perforation depth. To extend the length of a steel pipe, a plurality of steel pipes are arranged and adjacent steel pipes are joined inseparably using a connection portion 52 and a steel pipe key member 53. The step of extending the length of the steel pipe (S50) includes the step of coupling one side of the connection portion 52, where the steel pipe key member 53 is located, to the other end of the first steel pipe, one end of which is connected to the shoe 20 (S501), and the second end of the steel pipe. It includes a step (S502) of coupling one end of the steel pipe with the other side of the connection portion where the steel pipe keyway 521a is formed and the steel pipe key member 53 is located.

The steel pipe key member 53 is retracted to insert the connection portion 52 into the interior of the steel pipe, and the retracted steel pipe key member 53 is spread between the steel pipe and the connection portion 52 so that the outer circumference is in contact with the inner circumference of the steel pipe. .

In the step of combining the pilot and the ring bit (S60), the pilot (1) connected to the rod (2) is inserted into the steel pipe and combined with the ring bit (10). The pilot (1) is detachably coupled to the ring bit (10) using a key. The step of combining the pilot and the ring bit (S60) can be performed before the step of extending the length of the steel pipe (S50).

In the step of drilling the perforated surface (S70), the rod and the power means are connected and the tip 12 of the ring bit 10 is brought into contact with the perforated surface. The power means is driven to transmit rotational force to the ring bit (10) through the pilot (1). The ring bit 10 rotates to drill a hole surface. At this time, the steel pipe is connected to the ring bit 10 through the shoe 20 and is inserted into the perforation surface along the ring bit 10.

In the step of separating the pilot from the ring bit (S80), when the steel pipe is inserted into the perforation surface at a set depth, the pilot (1) is separated from the ring bit (10) and pulled out to the outside of the perforation surface. Since the pilot (1) and the ring bit (10) are coupled using a key, the ring bit (10) and the pilot (1) can be easily separated just by rotating the pilot (1).

In the step of injecting the grout material into the steel pipe (S90), the grout material is injected into the steel pipe. Direct perforation reinforcement devices reinforce the perforated surface together with the hardening grout material.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

1: Pilot 2: Rod
100: Straight perforation reinforcement device
10: Ring bit 11: Body
111: Flange 112: Inner locking groove
112a: first deep groove 112b: second deep groove
113: Projection key 12: Tip
20: Shoe 21: Outer locking groove
22: Step 23: Shoe keyway
30: Coupling member 40: Shoe key member
41: opening 50: steel pipe part
51a: first steel pipe 51b: second steel pipe
52: Connection 521: Insertion tube
521a: steel pipe keyway 522: flange
53: steel pipe key member 531: opening

Claims (13)

A ring bit in which a pilot connected to the power means can be detachably coupled and capable of drilling a perforation surface,
A shoe rotatably coupled to the ring bit and having a shoe keyway formed along the circumferential direction on the outer circumference,
A steel pipe part connected to the shoe and capable of moving along the ring bit and through which the rod of the power means can penetrate, and
A shoe key member formed in the shape of a circular band, a portion of which is broken to form an opening, and which connects the shoe and the steel pipe portion in the shoe key groove.
Including,
The shoe key groove where the shoe key member is located is formed in plurality at intervals in the longitudinal direction on the outer circumference of the shoe, and the bottom of the shoe key groove and the inner circumference of the shoe key member are formed as inclined surfaces. The outer circumference of the key member is formed as a plane, the inner circumferential diameter of the shoe key member is larger than the outer circumferential diameter of the shoe, and the gap between the openings is narrowed by an external force and the inner circumference is compressed to the bottom of the shoe key groove. The outer circumference of the flat surface is in close contact with the inner circumference of the steel pipe portion, the depth of the shoe key groove decreases from one side of the shoe to the other side, and the thickness between the outer circumference and the inner circumference of the shoe key member is from one side to the other side. It gets thinner in each direction
Direct perforation reinforcement device. delete delete In paragraph 1:
The steel pipe part
revenge steel pipe,
Connections connecting neighboring steel pipes and
A steel pipe key member connecting the connection portion and the steel pipe.
Includes,
The inner circumferential diameter of the steel pipe key member is larger than the outer circumferential diameter of the connection portion, and at least a portion of the steel pipe key member is broken and retracted between the connection portion and the steel pipe and is in close contact with the steel pipe.
Direct perforation reinforcement device. In paragraph 4,
The connection part is
An insertion tube inserted into the interior of an adjacent steel tube, and
A flange formed around the outer circumference of the insertion tube and in contact with the end of the steel pipe.
Includes
The steel pipe key member is located between the insertion pipe and the steel pipe.
Direct perforation reinforcement device. In paragraph 5,
A steel pipe key groove in which the steel pipe key member is located is formed along the circumferential direction on the outer circumference of the insertion pipe. The bottom of the steel pipe key groove and the inner circumference of the steel pipe key member are formed as inclined surfaces, and the steel pipe key member is retracted. The inner circumference hangs at the bottom of the steel pipe keyway.
Direct perforation reinforcement device. In paragraph 1:
Direct perforation reinforcement device further comprising a coupling member disposed between the ring bit and the shoe to rotatably connect the ring bit and the shoe. By connecting a ring bit that perforates the perforated surface and a steel pipe inserted into the perforated surface along the ring bit,
A shoe that can be rotatably coupled to the ring bit, to which the steel pipe can be connected, and has a shoe keyway formed along the circumferential direction on the outer circumference, and
A shoe key member formed in the shape of a circular band, a portion of which is cut off to form an opening, and which connects the steel pipe and the shoe in the shoe key groove and has a flat outer circumference.
Includes,
The shoe key groove in which the shoe key member is located is formed in plurality at intervals in the longitudinal direction on the outer circumference of the shoe, and the bottom of the shoe key groove and the inner circumference of the shoe key member are formed as inclined surfaces, and the shoe key groove is formed in plurality at intervals in the longitudinal direction. The inner circumferential diameter of the key member is larger than the outer circumferential diameter of the shoe and is compressed as the gap between the openings is narrowed by an external force, so that the inner circumference is caught at the bottom of the shoe keyway and the outer circumference of the plane is in close contact with the inner circumference of the steel pipe. , the depth of the shoe key groove decreases from one side of the shoe to the other side, and the thickness between the outer and inner circumferences of the shoe key member becomes thinner from one side to the other side.
Ring bit and steel pipe connecting device. A step of placing a shoe key member formed in the shape of a circular band, a portion of which is cut off to form an opening, in a shoe key groove formed along the circumferential direction of the shoe;
Retracting the shoe key member,
Inserting the portion of the shoe where the shoe key member is located into the interior of the steel pipe, and
Step of combining the ring bit and the shoe
Includes,
The shoe key groove where the shoe key member is located is formed in plurality at intervals in the longitudinal direction on the outer circumference of the shoe, and the bottom of the shoe key groove and the inner circumference of the shoe key member are formed as inclined surfaces. The outer circumference of the key member is formed as a plane, the inner circumferential diameter of the shoe key member is larger than the outer circumferential diameter of the shoe, and the gap between the openings is narrowed by an external force and the inner circumference is compressed to the bottom of the shoe key groove. The outer circumference of the flat surface is in close contact with the inner circumference of the steel pipe, the depth of the shoe key groove decreases from one side of the shoe to the other side, and the thickness between the outer circumference and inner circumference of the shoe key member is from one side to the other side. It gets thinner in each direction
How to install a straight hole reinforcement device. In paragraph 9:
A method of installing a straight perforation reinforcement device further comprising extending the length of the steel pipe. In paragraph 10:
The step of extending the length of the steel pipe is
A steel pipe key groove is formed at the other end of the first steel pipe, one end of which is connected to the shoe, to join one side of the connection portion where the steel pipe key member is located, and
A step of combining one end of the second steel pipe with the other side of the connection where the steel pipe keyway is formed and the steel pipe key member is located.
containing
How to install a straight hole reinforcement device. In paragraph 11:
The steel pipe key member is retracted to insert the connection part into the inside of the steel pipe, and the retracted steel pipe key member is spread between the steel pipe and the connection part so that the outer circumference is in contact with the inner circumference of the steel pipe. A method of installing a straight hole reinforcement device. In paragraph 9:
A step of combining a pilot connected to a rod powered from a power means with a ring bit,
Perforating the perforated surface so that the steel pipe is inserted into the perforated surface,
After drilling the perforation surface, separating the pilot from the ring bit and withdrawing it;
Injecting grout material into the interior of the steel pipe inserted into the perforated surface
containing more
How to install a straight hole reinforcement device.

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