JPH0715894U - Mounting structure for drilling bit and hollow tube - Google Patents

Abstract

(57) [Abstract] [Purpose] A mounting structure for a drill bit and a hollow tube, which allows the drill bit and the hollow tube to be easily mounted and easily separated from each other. provide.
In addition, a drilling bit that enables such a mounting structure is provided. [Structure] The mounting portion 4 of the boring bit 1 is provided with claws 7A, 7 for fitting in a groove 11 provided in the inner wall of the hollow tube body 2.
B and projections 8A, 8 that can be pressed from the hollow portion of the hollow tube body 2
B and. The protrusions 8A and 8B are connected to the hollow tubular body 2
When the steel material 3 or the like is inserted from the hollow portion and is pressed by its tip, the claws 7A and 7B retract. When the claws 7A, 7B and the groove 11 are fitted, when the claws 7A, 7B retract, the fitting is released. Then, the drill bit 1 and the hollow tube body 2 are easily separated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mounting structure for a drilling bit and a hollow pipe, which constitutes a drilling tool used when drilling soft ground or the like.

[0002]

[Prior art]

 Conventionally, the punching tool shown in Fig. 1 has been used for drilling soft ground, drilling when using the earth anchor method, drilling holes for draining water, drilling grout holes, and the like. That is, a perforating tool in which a perforating bit 1 called a lost bit or a Kronen bit is attached to a hollow tube body 2 called a casing head or a drive shoe is used. Then, the perforation bit 1 is rotated to perforate the ground. It should be noted that the hollow tube body 2 is appropriately connected with hollow tube bodies 21 and 22 called a casing or the like according to a length of a hole to be bored by a connecting member 31 called a casing coupling or the like.

After the soft ground or the like is drilled using this punching tool, a steel material is embedded in the hole for strengthening the soft ground. The method of burying steel is as shown in FIGS. 2 and 3. That is, after the boring is completed, the steel material 3 is inserted into the hollow portions of the hollow tubular bodies 22, 21, 2 (FIG. 2). Then, after the steel material 3 is inserted, the hollow tube bodies 22, 21, 2 are pulled out while pouring the grout material from the hollow portion of the hollow tube bodies 22, 21, 2 (FIG. 3). Further, the hollow tube bodies 22, 21, 2 may be pulled out without pouring the grout material.

At this time, the drill bit 1 must be left in the ground. This is because if the drill bit 1 is also pulled out, the steel material 3 is also pulled out at the same time, and the steel material 3 cannot be embedded in the ground. Therefore, it is preferable that the boring bit 1 and the hollow tube body 2 be mounted so as to be easily separated.

Conventionally, as shown in FIG. 1, a hollow tube 2 is provided with a notch at the edge, and the edge of the drill bit 1 is engaged with and attached to the notch. Then, the perforation bit 1 and the hollow tube body 2 were separated by the pressure when the grout material was poured. However, if the piercing bit 1 and the hollow tube body 2 are firmly engaged with each other, they may not be easily separated due to the pressure of the grout material. Further, if the engagement is such that the grout material is easily disengaged by the pressure, the perforation bit 1 and the hollow tube body 2 may be disengaged during the perforation.

When the grout material is not poured, the iron rod is inserted into the hollow portions of the hollow pipe bodies 22, 21 and 2 to separate the drill bit 1 from the hollow pipe body 2. The method of breaking the drill bit 1 or the hollow tube body 2 at the tip end is adopted. By this method, when the hollow tubular body 2 is destroyed, the hollow tubular body 2 cannot be reused, and the drilling material may be wasted.

[0007]

[Problems to be solved by the device]

 As described above, according to the conventional attachment structure of the drill bit 1 and the hollow tube body 2, there is a drawback in that they cannot be easily separated from each other, and troubles frequently occur when drilling soft ground. Therefore, in the present invention, by devising the mounting structure of the drill bit 1 and the hollow tube body 2, the two can be easily separated from each other.

[0008]

[Means for Solving the Problems]

 That is, the present invention provides a mounting structure of a drill bit and a hollow tube, wherein the drill bit has a claw for fitting into a groove provided in an inner wall of the hollow tube, and A protrusion that can be pressed from the hollow portion of the hollow tube is provided, and when the protrusion is pressed, the claw retracts, the fitting between the claw and the groove is released, and the bit for punching and the middle hole are formed. The present invention relates to a mounting structure for a boring bit and a hollow pipe, which is characterized in that the hollow pipe can be separated from the hollow pipe. Further, the present invention is a drill bit used for this mounting structure, comprising a blade tip portion for drilling and a mounting portion for mounting on a hollow tubular body, wherein the mounting portion has a middle portion. The claw for fitting into a groove provided on the inner wall of the hollow tubular body, and a projection that can be pressed from the hollow portion of the hollow tubular body are provided, and the claw retracts by pressing the projection. The present invention relates to a perforating bit.

[0009]

[Action]

 The perforation bit and the hollow pipe body are attached by fitting a claw provided in the attachment portion of the perforation bit into a groove provided in the inner wall of the hollow pipe body. Then, after the boring is completed, a steel material or the like is inserted into the hollow portion of the hollow tubular body. Then, the projection provided on the mounting portion of the drill bit is pressed by the tip of the steel material or the like. By pushing the projection, the claw retracts, and the fitting between the claw and the groove is released. Then, by further pressing the projection with the tip of steel material or the like, the drill bit and the hollow tubular body are separated from each other.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a front view of the drill bit 1 according to an example of the present invention, and FIG. 5 is a right side view of the drill bit 1. The perforating bit is composed of a cutting edge portion 30 and a mounting portion 40. The mounting portion 40 includes a rotating piece 5A and a rotating piece 5B. The turning piece 5A is provided with a claw 7A and a protrusion 8A. Further, the turning piece 5B is also provided with a claw 7B and a protrusion 8B. The turning piece 5A is rotatably attached by a shaft 6A, while the turning piece 5B is rotatably attached by a shaft 6B. A bolt 9A is embedded in the turning piece 5A on the blade tip 30 side, and one end of a spring 10A is connected to the bolt 9A. The other end of the shaft 10A is connected to the shaft 6B. On the other hand, a bolt 9B is also embedded in the turning piece 5B on the side of the cutting edge portion 30 thereof, and one end of a spring 10B is connected to the bolt 9B. The other end of the spring 10B is connected to the shaft 6A.

The following method is adopted to attach the drill bit 1 to the hollow tube body 2. That is, the protrusions 8A and 8B are pressed by fingers or the like to rotate the rotating pieces 5A and 5B inward, and the claws 7A and 7B are retracted. At this time, the springs 10A and 10B extend. Then, in this state, the attachment portion of the drill bit is inserted into the hollow portion of the hollow tube body 2 (FIG. 6). When the claws 7A and 7B reach the location of the groove 11 provided on the inner wall of the hollow tubular body 2, the elastic pieces tend to return to the springs 10A and 10B, causing the turning pieces 5A and 5B to move outward. Rotate. Therefore, the claws 7A and 7B project outward and fit into the groove 11 (FIG. 7). As described above, the hollow bit 1 and the hollow tubular body 2 are attached.

Next, in order to separate the drill bit 1 and the hollow tube body 2, the following method is adopted. That is, the steel material 3 and the like are inserted into the hollow portion of the hollow tube body 2. Then, the projections 8A and 8B are pressed by the tip of the steel material 3 or the like. Then, the rotating pieces 5A and 5B rotate inward, and the claws 7A and 7B retract (FIG. 8). Then, when the protrusions 8A and 8B are further pressed by the steel material 3 or the like, the drill bit 1 is separated from the hollow tube body 2 (FIG. 9).

FIG. 10 is a plan view showing a state in which the boring bit 1 and the hollow tube body 2 according to another example of the present invention are attached. FIG. 11 is an enlarged view of the vicinity of the portion where the claw 7A and the groove 11 are fitted together. In the drill bit 1 according to this example, the claws 7A and 7B are slidably inserted into the cylindrical body 15. The claws 7A and 7B are T-shaped. The springs 13A and 13B are inserted into the cylindrical body 15 in a state of pressing the head 7Aa of the claw 7A and the head 7Bb of the claw 7B. The springs 13A and 13B are contracted by the support rod 16 and exert a strong pressing force on the heads 7Aa and 7Bb. Further, springs 14A and 14B are inserted into the cylindrical body 15 outside the head 7Aa of the claw 7A and the head 7Bb of the claw 7B while pressing the heads 7Aa and 7Bb in opposite directions. With the support rod 16 pressing the springs 13A and 13B, the pressing force of the springs 13A and 13B is larger than the pressing force of the springs 14A and 14B. Therefore, the claws 7A and 7B project outward and fit in the groove 11 of the hollow tubular body 2.

The support rod 16 is provided with a protrusion 8. When the projection 8 is pressed by the steel material 3 or the like, the support rod 16 is disengaged and the springs 13A and 13B return to their original state. Then, the pressing force applied to the heads 7Aa and 7Bb by the springs 13A and 13B becomes extremely small, and the pressing force of the springs 14A and 14B becomes larger. Therefore, the heads 7Aa and 7Bb are pressed in the opposite direction, and as a result, the claws 7A and 7B are retracted inward. Then, when the fitting between the groove 11 and the claws 7A and 7B is released and the protrusion 8 is further pressed, the drill bit 1 and the hollow tube body 2 are separated (FIG. 12).

It should be noted that the present invention is not limited to the embodiment described above, and the claws 7A, 7B, etc., which can be fitted into the groove 11 provided on the inner wall of the hollow tubular body 2, and the hollow tubular body 2 Any shape and form can be used as long as it is a drill bit 1 having a mounting portion provided with protrusions 8A, 8B, 8 etc. that can be pushed from the hollow portion and can retract the claws 7A, 7B etc. when pushed. It can be attached to the hollow tube body 2 satisfactorily, and after piercing, both can be satisfactorily separated.

[0016]

[Effect of device]

 As described above, in the mounting structure of the drill bit and the hollow pipe body according to the present invention, the claws provided on the mounting portion of the drill bit are fitted into the grooves provided on the inner wall of the hollow pipe body. The drill bit can be easily attached to the hollow tube. Then, by inserting a steel material or the like into the hollow portion of the hollow tubular body and pressing the projection provided on the mounting portion of the drilling bit, the claw retracts and the claw and the groove are fitted together. Once released, the drill bit can be easily removed from the hollow tube. Therefore, it is not difficult to separate the drill bit from the hollow tube as is conventionally done, and it is not necessary to break the hollow tube to separate the two, and the drill bit is not drilled. It is possible to reduce troubles associated with work and to prevent waste of drilling material.

[Submission date] October 13, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

FIG. 10 is a plan view showing a state in which the boring bit 1 and the hollow tube body 2 according to another example of the present invention are attached. FIG. 11 is an enlarged view of the vicinity of the portion where the claw 7A and the groove 11 are fitted together. In the drill bit 1 according to this example, the claws 7A and 7B are slidably inserted into the cylindrical body 15. The claws 7A and 7B are T-shaped. The springs 13A and 13B are inserted into the cylindrical body 15 in a state of pressing the head 7Aa of the claw 7A and the head 7Bb of the claw 7B. The springs 13A and 13B are contracted by the support rod 16 and exert a strong pressing force on the heads 7Aa and 7Bb. The springs 13A and 13B may be integrated with each other through the hollow portion of the hollow support body 16 . Further, springs 14A and 14B are inserted into the cylindrical body 15 outside the head 7Aa of the claw 7A and the head 7Bb of the claw 7B while pressing the heads 7Aa and 7Bb in opposite directions. The pressing force of the spring 13A and 13B are, since they are designed to spring 1 4A and 14B pressing force magnitude Kunar so than in, pop out claw 7A及beauty 7B, fitted into the groove 11 of the hollow tube 2 They are in agreement.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The support rod 16 is provided with a protrusion 8. When the projection 8 is pressed by the steel material 3 or the like, the support rod 16 is disengaged and the springs 13A and 13B return to their original state , or the springs 13A and 13B are disengaged together with the support rod 16 . Then, the spring 13A及beauty 13B the head 7Aa and pressing force is extremely small Rukaarui which had given to the head 7Bb disappears, towards the pressing force of the spring 14A and 14B is increased. Therefore, the heads 7Aa and 7Bb are pressed in the opposite direction, and as a result, the claws 7A and 7B are retracted inward. Then, when the fitting between the groove 11 and the claws 7A and 7B is released and the protrusion 8 is further pressed, the drill bit 1 and the hollow tube body 2 are separated (FIG. 12).

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional punching tool including a drilling bit and a hollow tube.

FIG. 2 is a simplified diagram showing a method of burying a steel material after completion of perforation.

FIG. 3 is a simplified diagram showing a method of burying a steel material after completion of perforation.

FIG. 4 is a front view of a drill bit according to an example of the present invention.

5 is a right side view of the drill bit shown in FIG. 1. FIG.

FIG. 6 is a schematic view showing a mounting method for mounting a drill bit according to an example of the present invention to a hollow tube.

FIG. 7 is a schematic view showing an attachment method when attaching a drill bit according to an example of the present invention to a hollow tubular body.

FIG. 8 is a schematic view showing a detaching method when detaching the boring bit according to an example of the present invention from the hollow tubular body.

FIG. 9 is a schematic view showing a detaching method when detaching a boring bit according to an example of the present invention from a hollow tubular body.

FIG. 10 is a schematic view showing a state in which a boring bit according to another example of the present invention is attached to a hollow tubular body.

FIG. 11 is a schematic view showing the vicinity where the claw and the groove of the drill bit according to another example of the present invention are fitted together.

FIG. 12 is a schematic view showing a state in which a boring bit according to another example of the present invention is detached from a hollow tubular body.

[Explanation of symbols]

 1 Drilling Bit 2 Hollow Tube 7A Claw 7B Claw 8A Projection 8B Projection 8 Projection 11 Grooves Provided on Inner Wall of Hollow Tube 30 Blade Edge of Drilling Bit 40 Mounting Part of Drilling Bit

Claims (2)

[Scope of utility model registration request] 1. A mounting structure for a perforation bit and a hollow pipe, wherein the perforation bit has a claw for fitting into a groove provided in an inner wall of the hollow pipe, and the hollow pipe. A protrusion that can be pressed from the hollow portion of the body, and when the protrusion is pressed, the claw retracts, the fitting between the claw and the groove is released, and the drill bit and the hollow tube body An attachment structure for a drill bit and a hollow tube, characterized in that and can be separated from each other. 2. A bit for piercing, comprising a cutting edge portion for piercing and an attaching portion for attaching to a hollow tubular body, wherein the attaching portion is fitted into a groove provided on an inner wall of the hollow tubular body. A bit for perforation, comprising a claw for engaging with each other and a projection capable of being pressed from the hollow portion of the hollow tubular body, and by pushing the projection, the claw retracts.