JPH08144679A - Excavating tool - Google Patents

Abstract

PURPOSE: To avoid lowering in the excavation advanving speed even if depth of a hole to be excavated becomes larger. CONSTITUTION: In an excavating tool 110, a male spline 41 provided on a device 40, as a tool body, is engaged with a female spline 53 provided in an excavation pipe 50 so that at the time of excavation, the pipe 50 is rotated together with the device 40. Thus, sands and earth or rocks are prevented from being fixedly attached to the outer surface of the excavation pipe 50, and hence even if depth of a hole to be excavated becomes larger, frictional forces between the pipe 50 and sands and earth or rocks will not increase. Consequently, according to the invention, the excavating tool 110, wherein excavation advancing speed is not lowered even if depth of a hole to be excavated inreases, can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling tool for drilling a hole in the ground or rock in civil works such as anchor work, various well works, foundation pile work, etc. The present invention relates to a technique for improving a drilling tool so that the drilling speed does not decrease.

[0002]

2. Description of the Related Art Japanese Patent Application No.
7199. This excavating tool was invented for the purpose of improving the durability of the excavating device disclosed in Japanese Patent Laid-Open No. 63-11789, and as shown in FIGS. 4 to 7, this excavating tool 90 is ,
The device 10 is inserted through the drill pipe 30, and the pair of blocks 20 is attached to the bottom surface 10 a of the device 10.

As shown in FIG. 4, the device 10 is
A small diameter portion 10A having a spline groove 12 on the outer peripheral surface thereof, and a pair of insertion holes 1 into which the shaft portion 21 of the block 20 is inserted.
And a large-diameter portion 10B provided with 1, a rotational force of a hammer cylinder (not shown) is transmitted through the spline groove 12, and an impact force in the axial direction of the hammer (not shown) is also applied to the excavating pipe 30. It is adapted to be added to the upper surface 13a of the flange 13 that engages in the excavation direction.

As shown in FIGS. 4 to 7, the block 20 has a shaft portion 21 fitted in the insertion hole 11 of the device 10, and the device 10 integrally provided at the tip of the shaft portion 21. Of the main body 22 having a semicircular cross section having a cylindrical outer peripheral surface 22b having substantially the same radius as that of the outer peripheral surface of the main body, and a wear-resistant material such as cemented carbide implanted in a large number at the tip end surface of the main body 22 in the excavating direction And a large number of formed bits 23. (The illustration of the bit 23 is omitted in FIGS. 5 and 6.) Then, in this block 20, the shaft portion 21 is inserted into the insertion hole 11 of the device 10 with the flat end surfaces 22a thereof facing each other. It is rotatably fitted in and is fixedly held by the engaging pin 17 so as to be slidable in the axial direction by a predetermined dimension.

When the device 10 is rotated by the hammer cylinder in the excavating direction indicated by the arrow X in FIG. 4, the main body portion 22 receives excavation resistance against the ground or rock, and the shaft portion 21 rotates about its axis. As shown in FIG. 5, the flat end surfaces 22a contact each other to stop the rotation thereof, and one end of the flat end surface 22a has the device 1
The outer diameter of the outer peripheral surface 10b of 0 is increased by a predetermined amount to the outside in the radial direction. Then, as shown in FIG. 5 and FIG. 7, the portion of the main body portion 22 protruding from the outer peripheral surface 10b of the device 10 functions as an outer peripheral blade A, and serves to excavate the inner wall surface of the hole drilled in the ground or rock. . further,
The impact force of the hammer applied to the device 10 and the rotational force of the hammer cylinder are transferred to the block 20 via the device 10.
As a result, the block 20 crushes earth and sand or rocks by a large number of bits 23 planted on the tip end surface of the block 20 and excavates to move forward. At this time, the excavated earth and sand is supplied through the air holes 15a, 15b, 15c penetrating the device 10 as shown in FIGS. 4 and 7, and is blown out from the exhaust port 15d. It is moved in the discharge groove 14 along with the flow of the compressed air discharged when it falls, and is further discharged upward through the inside of the excavation pipe 30.

After the excavation is completed, when the hammer cylinder is rotated in the direction opposite to the excavation direction, each block 20 is rotated in the direction opposite to that during excavation due to the frictional force with the earth and sand, etc., as shown in FIG. The arcuate outer peripheral portion 22b of the main body portion 22 is in a diameter-reduced state in which the outer peripheral portion 22b of the device 10 is positioned inward of the outer peripheral surface 10b of the device 10 in the radial direction. As a result, the excavating tool 90 can be pulled upward from the excavating pipe 30. The excavation pipe 30 is left inside the excavated hole, and serves to reinforce the inner wall surface of the hole so that the inner wall surface does not collapse and the hole is buried.

[0007]

By the way, in the above-described excavating tool 90, the deeper the depth of the hole to be excavated, the greater the pressure of the ground or rock that acts on the outer peripheral surface of the excavating pipe 30. As a result, the outer peripheral surface of the excavation pipe 30 gradually adheres to the earth and sand and rocks, and the friction between the excavation pipe 30 and the ground or rock becomes large, so that the impact force applied to the device 10 advances the excavation pipe 30. Therefore, the excavation speed is gradually reduced, and in the worst case, it may not be possible to excavate. Further, in the anchor work, it is necessary to pull out the excavation pipe 30 from the soil after completing the excavation work, but in the excavation work using the above-described excavation tool 90,
Drilling pipe 30 sticks to the earth and sand and rocks
May not be able to be pulled out.

The present invention has been made in view of the above problems, and an object of the present invention is that sediment or rock adheres to the outer peripheral surface of a drill pipe even if the depth of the hole to be drilled becomes deep. (EN) An excavation tool which can prevent a decrease in excavation speed and can easily pull out an excavation pipe after excavation work.

[0009]

Means for Solving the Problems The above-mentioned problems are solved by arranging a tool body which pierces an excavation hole while rotating around an axis extending in the excavation direction or striking the axis, and surrounding the tool body. In a drilling tool that is provided and is engaged with the tool body in the drilling direction and is advanced in the drill hole integrally with the tool body, the drilling pipe is provided with respect to the tool body. Can be achieved by a drilling tool characterized by being engaged in a rotational direction.

[0010]

In the excavating tool of the present invention, since the excavating pipe engages with the tool body in the rotational direction, the excavating pipe moves forward in the excavation hole while rotating integrally with the tool body. As a result, it is possible to prevent the sediment and rocks from sticking to the outer peripheral surface of the drill pipe, and thus the friction between the drill pipe and the ground or rock becomes large even if the hole to be drilled is deep. There is no. Therefore, since the striking force applied to the tool body is not significantly consumed for advancing the excavation pipe, the excavation speed does not decrease even if the depth of the hole to be excavated becomes deep.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drilling tool according to the present invention will be described below in detail with reference to the drawings. Here, FIG. 1 is a side view showing a main part of a drilling tool according to a first embodiment of the present invention in a broken manner.
2 is an enlarged sectional view showing an essential part of an excavating tool according to a second embodiment of the present invention, and FIG. 3 is an enlarged sectional view showing an essential part of an excavating tool according to a third embodiment of the present invention. In the following description, the same parts as those of the conventional drilling tool 90 described above are designated by the same reference numerals, and the description thereof will be omitted.

First Embodiment A drilling tool 110 of the first embodiment is a female spline 53 provided on an inner peripheral surface of a drilling pipe 50 and a male spline provided on an outer peripheral surface of a large diameter portion 40B of a device 40 as a tool body. By engaging with 41, the drill pipe 50 is rotated integrally with the device 40, and since the configuration of the other parts is almost the same as the conventional drill tool 90 described above, In the following description, the characteristic part will be described in detail.

That is, as shown in FIG. 1, a male spline 41 is formed on the outer peripheral surface of the large diameter portion 10B of the device 40 of the excavating tool 110 of the first embodiment.

In the first embodiment, the excavating pipe 50 is divided into a thick first portion 51 and a thin second portion 52, and both of them are formed with their end faces abutted to each other. The outer peripheral surface is welded over the entire circumference so that it is coaxially integrated. And the first part 5
A female spline 53 that engages with the male spline 41 is formed on the inner peripheral surface of the end of the first block 20 side, and a step surface 54 is formed on the inner peripheral surface of the opposite end.

As a result, when the device 40 is inserted through the drill pipe 50, the male spline 41 of the device 40 and the male spline 53 of the drill pipe 50 are engaged in the rotational direction, so that the drill pipe 50 is connected to the device 40. Can be rotated together. In addition, the step portion 43 of the flange 42 provided on the device 40 comes into contact with the step portion 54 provided on the drill pipe 50, so that the drill pipe 5
0 is advanced together with the device 40 in the excavation direction.

When excavating the ground or rock using the excavating tool 110 of the first embodiment, the excavating pipe 50 is rotated integrally with the device 40 and is advanced in the excavating direction. Sediment or rock does not easily adhere to the outer peripheral surface 50a. This allows
Even if the pressure of the ground or rock that acts on the drill pipe 50 increases as the depth of the hole to be drilled increases, sediment or rock does not easily adhere to the outer peripheral surface of the drill pipe 50, and The frictional force with the ground or rock will not increase. Therefore,
Drilling pipe 5 against the frictional force with the ground or rock
Since the hammering force applied to the device 40 for advancing 0 is not consumed significantly, it is possible to prevent the excavation speed of the device 40 from decreasing even if the depth of the hole to be excavated becomes deep. it can.

That is, according to the excavating tool 110 of the first embodiment, since the excavating pipe 50 rotates integrally with the device 40, the excavating speed decreases even if the depth of the hole to be excavated becomes deep. Therefore, excavation work can be performed efficiently.

Embodiment 2 The drilling tool 120 of this embodiment 2 is the same as the above-mentioned embodiment 1 in which the means for rotationally engaging the drill pipe with the device is described.
This is different from the excavating tool 110 of. That is, as shown in FIG. 2, in the drilling tool 120 of the second embodiment, the groove 6 extending in the axial direction is formed on the outer peripheral surface 61 of the device 60.
2 is provided as a recess, and the drill pipe 65 has a pin 6 protruding radially inward from an inner peripheral surface 66 thereof.
7 have been planted. Then, by inserting the tip end portion of the pin 67 into the groove 62,
Are rotationally engaged with the device 60 so that they rotate together.

That is, in the excavating tool 120 of the second embodiment, in order to engage the device 60 and the excavating pipe 65 in the rotational direction, the pin 61 that requires a short axial dimension of the excavating pipe 65 is used. Drilling pipe 6
5 is extremely effective when the spline cannot be formed due to lack of a margin in the axial direction.

Third Embodiment The drilling tool 130 of the third embodiment includes the means for engaging the drill pipe with the device in the rotational direction.
This is different from the drilling tool 120 of That is, as shown in FIG. 3, in the drilling tool 130 of the third embodiment, the groove 8 extending in the axial direction is formed on the outer peripheral surface 81 of the device 80.
2 is recessed, and a key 88 is attached in a groove 87 that is recessed in the inner peripheral surface 86 of the excavating pipe 85 so as to extend in the axial direction. And the key 88
Is fitted into the groove 82 of the device 80, so that the drill pipe 85 is rotationally engaged with the device 80 and thus rotates integrally.

That is, in the excavating tool 130 of the third embodiment, since the key 88 is used to engage the device 80 and the excavating pipe 85 in the rotational direction, the outer peripheral surface 81 of the device 80 in the circumferential direction. It is extremely effective when it is not possible to form splines over the entire circumference. Further, since it is only necessary to form the grooves 82 and 87 in the device 80 and the drill pipe 85, respectively, there is an advantage that the device 80 and the drill pipe 85 can be easily manufactured as compared with the case of forming the spline, and a relatively large size. It also has the advantage that rotational torque can be transferred from the device 80 to the drill pipe 85.

It is needless to say that the excavating tool of the present invention is not limited to the above-mentioned embodiments, and the present invention can be applied to excavating tools having different tool bodies, for example.

[0023]

That is, the excavating tool of the present invention is provided with a tool body which pierces a drilling hole while rotating around an axis extending in the excavating direction, and which is arranged so as to surround the tool body. And a drill pipe that is engaged with the tool body to advance in the drill hole integrally with the tool body, wherein the drill pipe is engaged with the tool body in the rotation direction. Therefore, when excavating the ground or rock, the excavation pipe can be advanced in the excavation hole while being rotated integrally with the tool body, and the earth or sand or rocks on the outer peripheral surface can be easily moved. It does not stick to. As a result, even if the depth of the hole to be excavated is increased and the pressure of the ground or rock that acts on the drill pipe is increased, the friction between the drill pipe and the ground or rock is not increased, so that the ground or The hammering force applied to the tool body for advancing the excavation pipe against the frictional force with the bedrock is not consumed, and it is possible to prevent the excavation speed from decreasing. Therefore, according to the present invention, it is possible to provide an excavation tool that can efficiently perform excavation work without lowering the excavation speed even if the depth of the hole to be excavated becomes deep.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a drilling tool according to a first embodiment of the present invention in a cutaway manner;

FIG. 2 is an enlarged sectional view showing an essential part of a drilling tool according to a second embodiment of the present invention,

FIG. 3 is a cross-sectional view showing an enlarged main part of an excavating tool according to a third embodiment of the present invention.

FIG. 4 is an overall vertical cross-sectional view of a conventional drilling tool.

FIG. 5 is a front view illustrating a state in which the block of the conventional excavating tool shown in FIG. 4 is expanded in diameter.

FIG. 6 is a front view illustrating a state in which the block of the conventional excavating tool shown in FIG. 4 has a reduced diameter.

FIG. 7 is a perspective view for explaining the operation of the conventional excavating tool shown in FIG.

[Explanation of symbols]

 10 device (tool body) 10A small diameter part 10B large diameter part 11 insertion hole 12 spline groove 13 flange 14 discharge groove 15a air hole 15b air hole 15c air hole 15d exhaust port 17 locking pin 20 block 20R block 20L block 21 shaft part 22 Body part 22a Flat end face 22b Peripheral cylindrical surface 23 Bit 30 Drilling pipe 31 Step portion 32 Female spline 40 Device 40a Outer peripheral surface 41 Male spline 42 Flange 43 Step portion 50 Drilling pipe 51 First portion 52 Second portion 53 Male spline 54 step portion 60 device 61 outer peripheral surface 62 groove 65 excavation pipe 66 inner peripheral surface 67 pin 80 device 81 outer peripheral surface 82 groove 85 excavation pipe 86 inner peripheral surface 87 groove 88 key 90 conventional drilling tool 110 Example 1 according to the present invention Excavator Drilling tool according to the third embodiment of the 120 pieces of the drilling tool 130 present second embodiment according to the invention invention

Claims (1)

[Claims] 1. A tool main body which pierces a drill hole while rotating around an axis extending in the excavation direction or striking the axial direction, and a tool main body which is arranged so as to surround the tool main body and to the tool main body. An excavation tool that is engaged in the excavation direction and is advanced in the excavation hole integrally with the tool body, wherein the excavation pipe is rotationally engaged with the tool body. A drilling tool characterized by.