KR101704216B1 - Expansion core bit for core drill - Google Patents

Abstract

The present invention relates to an expansion core bit for core drilling used for repairing a fixing ring installed to fix a bell unit installed to a quay so as to fix ships to the bollard or a quay, will be.
The present invention relates to an expanded core bit for core drilling, A main body in which a fastening screw portion screwed to a drive shaft of the core drill is formed at the upper end and is inserted into a hole formed by the core bit and the lower end is sealed by the cover; A plurality of bit projections formed circumferentially in the body so as to be positioned above the cover; A bit assembly including excavation bits which are exposed to and from the plurality of bit projection and extraction holes; A pressing means for pressing the excavating bit toward the bit projecting and retracting hole when the drive shaft is engaged with the clamping screw portion and allowing the excavating bit to be pulled into the bit projecting and recessing hole when the driving shaft is separated from the fastening screw portion, In order to repair the bollard or the fixing ring, an annular expansion part is formed in the hole drilled with the core bit so that the repair material is inserted into the bollard or the fixing ring. Thus, the bollard or the fixing ring is firmly installed, It will be possible.

Description

Expansion core bit for core drill}

The present invention relates to an expansion core bit for core drilling used for repairing a fixing ring installed to fix a bell unit installed to a quay so as to fix ships to the bollard or a quay, More specifically, in order to repair the bollard or the fixing ring, an annular expansion part is formed in the hole drilled with the core bit so that the repair material is inserted into the bollard or the fixing ring, so that the bollard or the fixing ring is firmly installed. To provide an expanded core bit for core drilling that allows the core to be drilled.

Fixed hooks, which are installed on the wharf to fix the boats, are fixed to the bollard or the pier to fix the fenders to prevent the collision of the side of the ship.

In general, as a method of repairing a bollard or a fixing ring, a bollard is separated from an anchor bolt, an anchor bolt or a ring exposed on a concrete surface is cut, and a hole is drilled around the anchor bolt After removing the core by a method of separating the core, an anchor bolt is inserted into the hole together with a repair material such as a cement mortar, and the repair material is cured.

This method is generally used because it can repair the fixing ring for bollard or fenders at low cost.

However, in the above-mentioned method, there is a problem that the repair material filled in the hole together with the anchor bolt is not firmly fused with the existing concrete, and is separated from the hole due to external impact.

On the other hand, a method of increasing the coupling strength between concrete and a repair material by forming an extension in the hole formed by the core bit may be proposed. However, in the case of a core bit used in the past, Korean Patent Publication No. 10-2014-0022287 (2014.02.24 A core bit for a core drill is proposed which has a coupling portion to be coupled to a core drill, a shank integrally provided with the coupling portion, a shank having a predetermined diameter, a plurality of holes provided on an outer peripheral surface of the shank, A plurality of grooves having an inclination angle of 30-80 degrees from the upper end toward the lower end with respect to the rotation direction are formed at regular intervals in the inner and outer circumferential surfaces of the tip, .

Another example is a separable core drill of the Korean Registered Utility Model (Y1) 20-0381846 (Apr. 26, 2005), which is composed of a cylindrical separable core drill mounted on a drill and perforating stone, asphalt, A coupling including a first coupling groove formed with a plurality of concave grooves on the lower outer peripheral portion, a drill mounting portion mounted with a drill on an inner circumferential surface of the upper surface, and a first insertion portion formed with a concave end on a lower outer peripheral portion, ; A second fastening groove having a plurality of "a" -shaped concave grooves formed on a lower outer circumferential portion thereof, and a second fastening groove having a plurality of " A tube having a first seating portion formed with a receiving end and a second insertion portion formed with a receiving end at a lower outer periphery, A plurality of second fastening portions protruding to be mounted on the second fastening groove on the upper inner circumference, a second seating portion formed with a concave / convex shape to receive the second inserting portion, A bit made of a machining tip to which a diamond is attached; As shown in FIG.

In the case of the core drills described above, the structure for improving the workability and the lower end coupled with the bit are separated so as to improve the usability of the core drill. However, functions for forming the extension part to be provided in the present invention are provided These technologies are not being used.

KR 1020140022287 A 2014.02.24. KR 200381846 Y1 2005.04.06.

When replacing the old fixture of the bollard or fence device installed in the conventional pier, the core drill is simply inserted into the pier and the maintenance material is poured into the pierced hole to fix the anchor bolt. There is a problem that the anchor bolt and the repairing material are separated from the hole to the cylinder by the external impact, and the present inventors have researched the present invention in order to solve the above problems.

That is, in the present invention, an annular expansion part can be formed in the hole by inserting the expanded core bit provided in the present invention into the hole after separating the core from the structure in which the core bit is punched into the dock. The repair material filled in the hole is cured after being infiltrated into the expanded portion to serve as an anchor, so that an operation for preventing the detachment of the anchor bolt and the repair material from the hole by the external impact, The present invention has been completed based on the technical problem of the present invention.

According to an aspect of the present invention, in constructing an expanded core bit for a core drill, A main body in which a fastening screw portion screwed to a drive shaft of the core drill is formed at the upper end and is inserted into a hole formed by the core bit and the lower end is sealed by the cover; A plurality of bit projections formed circumferentially in the body so as to be positioned above the cover; A bit assembly including excavation bits which are exposed to and from the plurality of bit projection and extraction holes; A pressing means for pressing the excavating bit toward the bit projecting and retracting hole when the drive shaft is engaged with the clamping screw portion and allowing the excavating bit to be pulled into the bit projecting and recessing hole when the driving shaft is separated from the fastening screw portion, .

 The bit assembly includes a link that is pivotally connected to the excavation bit at one end with the pin; An upper fixture and a lower fixture rotatably connected to the other end of the link with a pin; And a fixing bolt for fixing the lower fixing body to the cover.

Third, the pressing means includes a rod integrally formed on an upper side of the upper fixing body and having a spring holding plate on the upper side; An upper spring positioned above the spring seat plate; A spring pressing plate installed on the upper spring such that an upper push button is located on the fastening screw portion; A lower spring positioned on the lower rod of the spring seat plate; And a spring support ring fixed to the body to support the lower spring and having a hole through which the rod passes at the center.

In the case of using the expanded core bit for core drilling according to the present invention, when the drive shaft of the core drill is fastened to the fastening screw portion after inserting the expanded core bit in the state where the primary hole is drilled using the core drill, When the expanded core bit is driven in this state, the excavating bit provided in the bit assembly is moved outward by the urging force of the upper spring provided on the pressing means, thereby forming the annular extending portion inside the hole It is possible to simplify the expansion work in the hole which is not possible in the prior art.

In addition, when the extension part is formed in the hole as described above, when it is used to replace the old part of the fixing bollard for the bollard or the fender installed in the wharf, the maintenance material filled in the hole is cured in the state of being introduced into the expansion part, So that it is possible to prevent the anchor bolt and the repair material from being detached from the hole into the cylinder even if an external impact is applied in the state of maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view showing a preferred embodiment of an expanded core bit for core drilling according to the present invention;
Fig. 2 is an exploded perspective view of Fig.
Fig. 3 is a cross-sectional view of the expanded core bit for core drilling provided by the present invention
Fig. 4 is a flowchart showing an operation sequence of forming an enlarged portion in a hole by using the present invention

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of an expanded core bit for core drilling provided in the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a preferred embodiment of an expanded core bit for a core drill according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is a cross- Respectively.

As shown in the drawing, the core bit for core drill 1 according to the present invention is mounted on the upper end of the main body 2 to be coupled to the drive shaft 110 of the core drill 100, Are joined together.

The main body 2 has a pipe structure and its lower end is sealed by a cover 4. [ In the present invention, only the lower end portion 2a in which the bit assembly 10 is built is expanded so that the frictional resistance can be minimized in a state where the main body 2 is inserted into the hole 200. In the lower end portion 2a, A plurality of bit projecting / recessing holes 5 are formed so as to penetrate inside and outside. Such a configuration can minimize the area where the hole 200 and the main body 1 are rubbed together, thereby providing the function of making the main body 1 easy to insert.

The plurality of bit projecting and retracting holes 5 are formed to be narrow in width and longer in the axial direction and the excavating bit 11 coupled to the bit projecting and retracting hole 5 is tightly fitted in the width direction, And is provided so as to be capable of providing a sufficient clearance for vertically moving up and down in the longitudinal direction.

The excavation bit 11 is included in the bit assembly 10 and the bit assembly 10 is connected to the excavation bit 11 and the link 12 and the upper fixture 13 and the lower fixture 14 Lt; / RTI >

The combination of these is made such that one end of the link 12 is coupled to the upper end and the lower end of the excavating bit 11 exposed inside the main body 2 by means of the pin 15, The other end of the assembled link 12 is connected to the upper fixture 13 by a pin 15 so as to be rotatable and the other end of the link 12 assembled to the lower end of the excavation bit 11 is connected to the lower fixture 14 ) To be rotatable. The lower fixture 14 is fixed to the cover 4 by using a fixing bolt 16 which is coupled to the cover 4 side. The excavation bit 11 is formed so as to be able to crush concrete by coupling a bit of cemented carbide or diamond to the outside of the hole 200.

The bit assembly 10 is urged by the upper pressing means 20.

The pressing means 20 presses the excavating bit 11 toward the bit projecting and dropping hole 5 when the driving shaft 110 is coupled to the clamping screw portion 3 so that excavation can be performed, The drilling bit 11 is pulled into the bit projecting and depressing hole 5 when the drill bit 110 is separated, thereby making it impossible to excavate the bit.

A rod 21 having an upper spring holding plate 22 is formed integrally with the upper holding body 13 of the bit assembly 10 and an upper spring 23).

The push button 25 is located above the upper spring 23 and the push button 25 is located within the fastening thread 3. [ A lower spring 26 disposed on the rod 21 is disposed below the spring holding plate 22 and a lower spring 26 is supported by a spring support ring 27 fixed to the main body 2. [ I can do it. At this time, the spring support ring 27 is configured to provide a structure in which a hole through which the rod 21 passes is formed at the center and is fixed to the main body by the bolts 28 engaged at the main body 2 side.

The elastic force of the upper spring 23 in the pressing means 20 is configured to be stronger than the elastic force of the lower spring 26.

When the push button 25 is pressed by the drive shaft 110 as described above, the upper spring 23 and the lower spring 26 are pressed simultaneously to press the bit assembly 10, The lower spring 26 is inflated and the spring holding plate 22 formed at the upper end of the rod 21 expands and the pressing force of the lower spring 26 is released. .

The upper fixture 13 of the bit assembly 10 integrally formed with the rod 21 is moved upward together with the upper fixture 13 and the link 12, And the link 12 connecting the excavation bit 11 and the lower fixture 14 is extended in the axial direction to move the excavation bit 11 inwardly of the main body 2 And the like.

The assembly of the present invention is carried out by inserting the spring pressing plate 24 with the push button 25 upward so that the lower spring 4 of the main body 2 is detached, The spring support ring 27 is connected to the bolt 28 engaged with the main body 2 in a state in which the spring holding plate 24 at the upper end of the rod 21 on which the bit assembly 10 is assembled And then the cover 4 is joined to the lower side of the lower end 2a and the fixing bolt 16 is fastened to the side of the cover 4 to fasten the lower fixture 14 of the bit assembly 10 to the cover 4. [ It is fixed.

Fig. 4 shows an operation flow chart for forming an extension in a hole using the present invention.

An example of forming the extension 300 in the hole 200 drilled with the core bit using the core bit for core drilling 1 according to the present invention is as follows: Drilling, (3) forming the extension, (4) separating the core drill, and (5) withdrawing the expanded core bit. Hereinafter, each procedure will be described in more detail.

(1) Extension core bit input

The expanded core bit 1 is first inserted into the perforated hole 200 by joining the core bit to the core drill in the concrete structure such as a pier.

At this time, the excavating bit 11 is positioned in the bit projecting / recessing hole 5 formed in the main body 2, so that the expanded core bit 1 is naturally drawn into the hole 200.

(2) Core Drill Coupling

The drive shaft 110 of the core drill 100 is engaged with the fastening screw portion 3 provided at the upper end of the main body 2 while the expanded core bit 1 is inserted into the hole 200 as described above.

When the drive shaft 110 is coupled to the fastening screw portion 3, the push button 25, which is located in the fastening screw portion 3, is pressed by the drive shaft 110. At this time, the upper spring 23 and the lower spring 26 The upper fixture 13 of the bit assembly 10 is pressed toward the lower fixture 14 and the upper fixture 13 and the lower fixture 14 are pressed against the bit assembly 10, The excavation bit 11 interconnected with the excavator 12 is urged toward the wall surface of the hole 200.

(3) Formation of extension part

When the core drill 100 is driven in a state where the upper spring 23 and the lower spring 26 are pressed while the drive shaft 110 of the core drill 100 is engaged with the drill bit 11, (300).

(4) Core drill is separated

Since the excavating bit 11 of the expanded core bit 1 is inserted into the expanded portion 300 in the state where the extended portion 300 is formed as described above, impossible.

In order to separate the expanded core bit 1 from the hole 200, the drilling bit 11 located in the extension part 300 must first be moved to the inside of the main body 2, The drive shaft 110 of the core drill 100 is separated from the fastening screw portion 3 only by a pitch.

When the drive shaft 110 is separated as described above, the lower spring 26 positioned in the spring support ring 27 fixed to the main body 2 is expanded and the spring holding plate 22 at the upper end of the rod 21 is moved upward Since the lower fixture 14 of the bit assembly 10 is fixed to the cover 4, the upper fixture 13 is moved upward to pull the link 12, The excavating bit 11 coupled with the pin 15 is moved from the enlarged portion 300 to the main body 2 so that the extended core bit 1 can be separated.

(5) Extraction of core bits

The extended core bit 1 is inserted into the hole 200 in a state in which the driving shaft 110 of the core drill 100 is separated so as to be caught by only the pitch of the fastening screw portion 3 and the excavating bit 11 is moved toward the main body 2. [ ).

In the present invention, it is proposed to repair a fixing ring or the like which is provided to fix a bollard which is installed at a wharf to fix a ship, It is obvious that the present invention can be applied variously to the maintenance work of the machine.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of protection of the present invention should not be limited to the described embodiment, but should be determined by the equivalents as well as the claims that follow.

1: (for core drilling) Expanded core bit 2: Body
2a: lower end portion 3: fastening screw portion
4: cover 5: bit of immigration
10: bit assembly 11: excavation bit
12: link 13: upper fixture
14: lower fixture 15: pin
16: fixing bolt 20: pressing means
21: rod 22: spring seat plate
23: upper spring 24: spring pressure plate
25: push button 26: lower spring
27: spring support ring 28: bolt
100: core drill 110: drive shaft
200:

Claims (3)

In constituting the expanded core bit (1) for core drilling,
The core drill 100 has a pipe structure in which a fastening screw portion 3 screwed to the drive shaft 110 is formed at the upper end and is inserted into the hole 200 formed by the core bit, (2);
A plurality of bit projecting and depressing holes 5 formed in the main body 2 in the circumferential direction so as to be positioned above the cover 4;
A bit assembly (10) including excavation bits (11) protruding and retracting into and out of said plurality of bit projecting and recessing holes (5);
When the drive shaft 110 is coupled to the fastening screw portion 3, the excavating bit 11 is pressed toward the bit projecting / retracting hole 5 so that excavation can be performed, and the drive shaft 110 is separated from the fastening screw portion 3 (20) for pulling the excavation bit (11) into the bit emergence hole (5) and making excavation impossible;
The bit assembly (10) comprises a link (12) having one end pivotally connected to the excavating bit (11) with a pin (15);
An upper fixture 13 and a lower fixture 14 rotatably connected to the other end of the link 12 by a pin 15;
And a fixing bolt (16) for fixing the lower fixture (14) to the cover (4).
delete The method of claim 1,
The pressing means 20 includes a rod 21 integrally formed on the upper side of the upper fixing body 13 and having a spring holding plate 22 at an upper end thereof;
An upper spring (23) placed on the upper side of the spring holding plate (22);
A spring pressing plate 24 provided on the upper spring 23 so that the upper push button 25 is positioned on the fastening screw portion 3;
A lower spring 26 positioned on the lower rod 21 of the spring seat plate 22;
And a spring support ring (27) fixed to the main body (2) and supporting the lower spring (26) and having a hole through which the rod (21) passes at the center.

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