JP4696489B2 - Drilling tool - Google Patents

Description

  The present invention relates to a drilling tool, and more particularly to a so-called double-pipe type drilling tool including a casing and a ring bit.

  Generally, double-pipe excavation tools are used, for example, for slope construction to prevent and stabilize steep slopes, and to improve weak ground such as strata with weak geology and cracks. (See, for example, Patent Document 1). The double-pipe excavation tool is provided at the tip of a widely used rock drill and is used for excavation of natural ground.

  For example, as shown in the cross-sectional view of the tip of the excavation tool in FIG. 10, the ring bit (lost bit) 101 constituting a part of the excavation part 110 provided at the tip of the excavation tool 100 extends in the circumferential direction near the rear end. Thus, the concave groove 102 is formed. Then, a retaining ring 103 is placed over the recessed groove 102, and the retaining ring 103 is fitted into a recessed groove 106 of the casing top 105 fixed to the casing pipe 104 to lock the ring bit 101. In this excavation tool 100, a device (not shown) having a tip as an excavation part (an inner bit or the like as an appropriate excavation part may be included) is built in the pipe casing 104. The Reference numeral 107 denotes a weld using a groove.

  By the way, after excavating a natural ground with the above-described excavation tool, the ring bit 101 and the casing pipe 104 that constitute a part of the excavation tool are left in the excavated hole, and other devices, rods, and the like are excavated. It is pulled out from the hole and collected. And a chemical | medical solution etc. are inject | poured in the casing pipe 104, the geology of the casing pipe 104 vicinity is improved, and a natural ground is made stable.

On the other hand, for example, in slope work for the purpose of preventing and stabilizing a steep slope, an appropriate anchor material is inserted after excavation. The anchor material has a length and strength sufficient for the stability of the natural ground, and is designed to stabilize the natural ground when the anchor material is inserted and the anchor material is fixed. That is, it is not necessary to leave the ring bit and the casing pipe in the natural ground after the anchor material is inserted. Therefore, even if it is in a ring bit and a casing pipe, if it is pulled out and collected in the same way as other devices and rods as described above, it can be used when excavating other parts again, and it can be used in slope work etc. Costs can be reduced.
JP 2000-80881 A

  The present invention has been made in view of the above circumstances, and is a double-pipe type that excavates holes for the purpose of preventing and stabilizing weak ground such as soft geology and cracked formations and steep slopes. After drilling the drilled object to form a hole, even though it is a drilling tool, after drilling the ring bit and the casing pipe after inserting and installing the anchor material as well as the device and rod, drill the hole in another place In some cases, it is an object to provide a drilling tool that can be fully recovered so that it can be reused.

In order to solve the above-mentioned problems, the present invention provides an excavation tool having the following means.
That is, the invention according to claim 1 is a casing pipe that is formed in a cylindrical shape with a built-in device that rotates around a central axis and presses an object to be excavated, and an excavation portion that is provided to protrude from the tip of the casing pipe. The excavation part is composed of a tip of an inner bit provided at the tip of the device and a tip of a ring bit provided at the outer periphery of the tip of the inner bit, and the ring bit is rotatably provided with respect to the casing pipe through the engagement member which is welded to the casing pipe, the inside of the engagement member and the casing pipe is casing shoe is disposed, The rear end of the engagement member and the front end of the casing pipe are joined together by welding, and on the inner peripheral surface of the casing pipe The outer peripheral surface of the serial casing shoe so as to be brought into contact with the engaging member and the casing shoe is characterized in that it is welded.

In the excavation tool according to the present invention, when the device is rotated, the inner bit provided at the distal end of the device also rotates, and the distal end constituting the excavation part suitably excavates the work to be excavated and rotates. The ring bit provided on the outer periphery of the tip of the inner bit to be excavated also preferably presses the work to be excavated. In addition, the casing pipe maintains its inner wall so that the excavated hole does not collapse. In this excavation tool, when the casing pipe is pulled out after excavating the work, the ring bit engaged with the casing pipe can be extracted at the same time. Therefore, the excavation tool that can excavate the work to be excavated and can also suitably collect various members constituting the excavation part provided at the tip of the excavation tool after the excavation of the hole is completed. It becomes.
Further, in the excavation tool according to the present invention, the rear end of the casing shoe provided inside the casing pipe comes into contact with a part of the device to be struck and is thereby pressed in the excavation direction. Therefore, the casing pipe is also suitably inserted into the excavated hole.

According to a second aspect of the present invention, in the excavation tool according to the first aspect, a pressed surface that intersects a pressing direction to the work to be excavated is formed at a rear end of the ring bit, and the pressed surface is formed on the pressed surface. A front end of the casing shoe is in contact, and a rear end of the casing shoe is in contact with and pressed against a part of the device.

  In the excavation tool according to the present invention, the ring bit is pressed from the device. Therefore, the tip of the ring bit constituting a part of the excavation part can excavate the work to be excavated suitably.

  The invention according to claim 3 is the excavation tool according to claim 1 or 2, wherein the inner bit is configured integrally with the device.

  In the excavation tool according to the present invention, it is not necessary to provide the inner bit as a separate member from the device. Therefore, the cost can be reduced also in producing the excavation tool. In addition, the excavating force is transmitted without going through another member, so that the excavating force is less likely to be lost, and the excavated object can be excavated appropriately.

  According to a fourth aspect of the present invention, in the excavation tool according to any one of the first to third aspects, the engagement member is configured by connecting a multi-part structure member in a circumferential direction. It is characterized by being.

  In the excavation tool according to the present invention, when the ring bit is attached to the tip of the casing pipe, it can be easily attached by connecting the divided engaging members. Therefore, it is easy to attach the ring bit to the casing pipe, and the working efficiency of the worker is enhanced.

  According to a fifth aspect of the present invention, in the excavation tool according to any one of the first to fourth aspects, the inner peripheral surface of the engagement member and the outer peripheral surface of the ring bit are respectively connected to each other. Corresponding uneven portions are provided.

  In the excavation tool according to the present invention, the engagement member and the ring bit are preferably engaged by the concavo-convex portions provided so as to correspond to each other. Moreover, the uneven | corrugated | grooved part enlarges a mutual contact area. Accordingly, the mutual engagement can be made more surely strong.

  According to the excavation tool according to the present invention, although it is a double-pipe excavation tool for excavating holes for the purpose of preventing and stabilizing weak ground such as soft geology and cracked formations and steep slopes After drilling the drilled object to form a hole, not only the device and rod, but also the anchor bit is inserted and installed, and the ring bit and casing pipe are reused when drilling a hole at another location. All can be recovered as possible.

Hereinafter, an embodiment of an excavation tool according to the present invention will be described with reference to the drawings.
1 is a side sectional view of a drilling tool provided in a rock drill, FIG. 2 is a front elevation view of the tip of the drilling tool shown in FIG. 1, FIG. 3 is a side sectional view of the device and a front view of the tip, and FIG. FIG. 5 is a side sectional view of the engaging member, FIG. 6 is a side sectional view of the casing shoe, and FIG. 7 is a side sectional view showing engagement of the casing pipe, the ring bit, and the engaging member. FIG. 8 is a side sectional view of an excavation tool provided with two step portions, and FIG.

  The excavation tool 1 shown in FIG. 1 has a cylindrical casing pipe 20 formed with an inner diameter larger than the maximum outer diameter of the device 10 so as to cover the outer periphery of the device 10 configured to be rotatable around a central axis O. Provided. Moreover, the ring bit 40 engaged through the engaging member 30 provided by welding is provided in the front-end | tip 20a of the said casing pipe 20, although it explains in full detail behind. A casing shoe 35 is welded to the inside of the engaging member 30 and the casing pipe 20 using a groove 28.

  Further, as can be seen from the front view of the tip shown in FIG. 2 as well, the tip 10a of the device 10 and the tip 40a of the ring bit 40 are embedded at appropriate locations. Thus, the excavation part 50 is formed. As will be described in detail later, the excavation unit 50 is a part that excavates the workpiece to be crushed and cut to form a hole. In the excavation part 50 of the excavation tool 1, the carbide chip T is directly embedded in the tip 10 a of the device 10 to configure the excavation part 50, but the device is not limited to this. The excavation part 50 may be configured by attaching an inner bit as a separate member to the tip 10a of the ten and burying the cemented carbide tip T at the tip of the inner bit.

  As shown in the side sectional view of FIG. 3A, the device 10 includes a drive mechanism engaging portion 12 behind the device body 11 formed in a substantially columnar shape (right side in the drawing). Although not shown, the device 10 is driven and rotated by a hammer mechanism and a rotation mechanism provided behind the device 10. The device body 11 is provided with a plurality of spline teeth 11a that protrude in the circumferential direction of the substantially cylindrical section and engage with the ring bit 40 in the vicinity of the front end thereof, protruding from the front end to the rear end at appropriate intervals. Then, the ring bit 40 is fitted into recesses 43 provided at appropriate similar intervals on the inner peripheral surface of the ring bit 40, and the ring bit 40 receives the circumferential rotational force of the device 10. In addition, a protruding portion 11 b protruding in the circumferential direction of the cross section is provided at the intermediate portion of the device body 11. Therefore, the front end (left side in the figure) of the protruding portion 11b is formed with a step portion 11c that contacts the rear end 35c of the casing shoe 35. As a result, when the device 10 is struck, the casing shoe 35 is pressed, and the rear end 40b of the ring bit 40 is pressed by the tip 35a of the casing shoe 35, so that the hammer mechanism is struck by the ring bit 40. Will be transmitted.

  Further, the drive mechanism engaging portion 12 is provided with a concave groove 12a that fits with a spline tooth provided in a rotation mechanism (not shown) in the circumferential direction of the substantially circular cylinder. In addition, a fitting insertion hole 12b is provided at the rear end of the driving mechanism engaging portion 12 for fitting the rod 19 that receives a hit from the hammer mechanism. Further, the inside of the device 10 is provided with an outflow hole 18 through which water or the like can flow out so that the excavation part 50 can excavate the work to be excavated. The outflow hole 18 is divided into a tip hole 18a connected to the device tip 10a constituting the excavation part 50, and a side hole 18b connected to the side of the device body 11 so that the earth and sand flow backward. Therefore, the side of the device body 11 is provided with an outlet 17 through which the earth and sand can be poured out so as to cut out the side.

  As shown in the front view of the front end of FIG. 3B, the front end 10a of the device 10 has a substantially circular cross section from the front, and the above-described carbide chip T is embedded in the end surface 10a. . Further, notched concave grooves 10b are provided at equal intervals in the circumferential direction on the side wall formed in a substantially cylindrical shape. As shown in the drawing, the notch groove 10b is formed in an asymmetric shape in which the cross section of the groove from the front is deformed.

  The casing pipe 20 is configured to be connected to an appropriate length according to the length of the hole to be excavated. An inclined portion 21 is provided at the front end 20a of the casing pipe 20 in order to serve as a groove 28 for welding the engagement member 30 and the casing shoe 35.

  Next, the ring bit 40 provided on the outer periphery of the tip 10a of the device 10 will be described. That is, as shown in FIGS. 4A and 4B, the ring bit 40 is formed in a substantially cylindrical shape having a circular cross section viewed from the front. Specifically, a concave portion 43 is formed which has an inner diameter that is substantially uniform and that is formed in a concave shape so as to be fitted to the spline teeth 11 a provided near the tip of the device body 11. Further, an embedded portion 41 having a thickness capable of embedding a carbide tip T is provided in the tip direction (left side in the figure) of the ring bit 40, and the carbide tip T is embedded in the embedded portion 41. A part of the excavation part 50 is formed. Further, a concave groove 42 that is continuous in the circumferential direction is provided on the outer periphery of the rear end (right side in the drawing). The concave groove 42 is a portion that is engaged with an engaging protrusion 32 provided on an engaging member 30 described later.

  Next, the engaging member 30 and the casing shoe 35 disposed between the casing pipe 20 and the ring bit 40 will be described. As shown in FIG. 5, the engaging member 30 is formed in a substantially annular shape and has an outer diameter that is substantially uniform. Further, an engagement protrusion 31 is formed on the inner peripheral surface so as to protrude inward from the vicinity of the tip (left side in the figure) in the circumferential direction, and the vicinity of the rear end also extends in the circumferential direction. Thus, an adhesive protrusion 32 that protrudes inward is formed.

  Further, as shown in FIG. 6, the casing shoe 35 is formed in a substantially annular shape, and has an inner diameter that is substantially uniform. Further, an adhesive recess 36 is formed on the outer peripheral surface so as to protrude outward in the circumferential direction in the vicinity of the front end (left side in the figure), and in the vicinity of the rear end, the casing pipe 20 is formed in the vicinity of the rear end. A side wall 37 is formed with an outer diameter matched to the inner diameter of the inner wall.

  Then, as described above, the groove 28 is provided at the tip 20a of the casing pipe 20 formed as described above, and the engagement member 30 and the casing shoe 35 are welded. That is, as shown in FIG. 7A, first, the ring bit 40, the casing shoe 35, and the casing pipe 20 are arranged from the distal direction (left side in the figure), and the cross-sectional circle is semicircular on the outer side. The engaging member 30 which consists of the left-right structure divided | segmented into 2 vertically is arranged. Then, as shown in FIG. 7B, the casing shoe 35 is fitted into the tip 20a of the casing pipe 20, and the outer peripheral surface of the casing shoe 35 is brought into contact with the inner peripheral surface of the casing pipe 20. Welded.

  Further, as shown in FIG. 7B, the rear end 40b of the ring bit 40 is brought into contact with the front end 35a of the casing shoe 35, and the above-described vertically divided engagement member 30 is divided. The ring bit 40 and the casing shoe 35 are connected in the circumferential direction so as to have a circular cross section so as to cover the outer peripheral surface, and engage with the tip 20a of the casing pipe 20 as shown in FIG. It is welded by a groove 28 formed between the rear end 30b of the member 30. Here, the adhesion protrusion 32 of the engagement member 30 and the adhesion recess 36 of the casing shoe 35 are suitably fitted. Therefore, the engagement member 30 is difficult to be detached from the casing pipe 20 and the casing shoe 35. In addition, since the said engaging member 30 is comprised by connecting the structure body of a multi-partition structure to the circumferential direction, it can be attached suitably.

  Thus, when the ring bit 40 is attached to the casing pipe 20, the engagement protrusion 31 provided on the outer peripheral surface of the engagement member 30 is suitably fitted in the concave groove 42 of the ring bit 40. The ring bit 40 is rotatable with respect to the casing pipe 20. Further, since the casing shoe 35 is provided inside the casing pipe 20, the rear end 35 c is formed so as to protrude from the casing pipe 20.

  In the excavation tool 1 configured as described above, when the device 10 is struck by the hammer mechanism via the rod 19, the stepped portion 11 c that forms a part of the device 10 has a struck force. The rear end 35c of the casing shoe 35 that comes into contact is pressed. Further, the front end 35 a of the casing shoe 35 presses the rear end 40 b of the ring bit 40 and transmits the pressing force received by the tapping to the excavation part 50. Therefore, the excavation part 50 excavates an object to be excavated suitably. Further, when the device 10 is rotated by the rotation mechanism, the ring bit 40 is rotated by spline fitting provided in the device main body 11, and the excavation unit 50 excavates the work to be excavated suitably.

  The excavation tool 1A shown in FIG. 8 shows an example in which a second step portion 11d is provided in addition to the step portion 11c that contacts the engaging member 30 of the device 10A provided in the excavation tool 1 described above. That is, in addition to bringing the step portion 11c of the device body 11 into contact with the rear end 35c of the casing shoe 35, the second step portion 11d is made to be pressed at the rear end 40b of the ring bit 40. 40c. Specifically, the device main body 11A is provided with a stepped second step portion 11d by reducing the diameter of the circular cross section of the device 11A, and the ring bit 40 has a rear end 40b of the pipe casing 20 at the rear end 40b. A pressed portion 40c is provided so as to protrude inward. As described above, if the excavating tool 1A is configured, the force hit by the hammer mechanism can be directly transmitted to the ring bit 40, so that excavation is more preferably performed when excavating an object to be excavated. Will be able to. In addition, in this excavation tool 1A, the part comprised similarly to the excavation tool 1 mentioned above attaches | subjects the same code | symbol, and abbreviate | omits the description.

  Further, the above-described excavating tools 1 and 1A are configured by adopting a so-called down-the-hole hammer type as a hammer mechanism for obtaining a hitting force, but the excavating tool 1B shown in FIG. This is an example of adopting the format. In the excavation tool 1B, a hole provided in the device 10B is formed to the vicinity of the excavation part 50, and the rod 19B is inserted to the vicinity of the tip of the device 10B. The rod 19B is formed with a larger diameter than the above-described excavating tools 1 and 1A. In addition, the part comprised similarly to the excavation tool 1 mentioned above attaches | subjects the same code | symbol, and abbreviate | omits the description. In this way, if the excavation tool 1B is configured, the distance between the rod 19B and the excavation part 50 can be configured to be short, the escape of the force hit by the hammer mechanism can be reduced, and the excavated object can be excavated more preferably. In addition, the device 10B can be further prevented from being bent.

  Excavation tools 1, 1 </ b> A, 1 </ b> B configured as described above dispose anchors after excavating an object to be excavated to form holes. In other words, in the excavation tool 1 shown in FIG. 1, after excavating the work to be excavated to form a hole, the device 10 is pulled out rearward (rightward in the drawing) together with the rod 19 and collected. At that time, in the hole, there are the casing pipe 20, an engagement member 30 integrated with the tip 20 a of the casing pipe 20 via a casing shoe 35, and a ring bit engaged with the engagement member 30. 40 is left. Thereafter, an appropriate anchor material is inserted into the remaining casing pipe 20.

  Then, after the anchor material is inserted into the casing pipe 20, the rear end of the casing pipe 20 is pulled backward (rightward in the figure). Then, the casing shoe 35 and the engaging member 30 integrated with the casing pipe 20 are also pulled rearward (rightward in the drawing). Further, the ring bit 40 engaged with the engagement member 30 is also pulled rearward (rightward in the figure) by the engagement. Therefore, all the remaining members of the excavation tool 1 described above are pulled out and collected. As a result, the extracted excavation tool 1 can be used again when excavating an object to be excavated in another place to form a hole, which leads to a reduction in cost for excavation work.

  It should be noted that the present invention is not limited to the above-described embodiment, and can be selected as appropriate without departing from the spirit of the present invention. For example, there is no problem even if the excavation part 50 is configured to expand the diameter.

It is a sectional side view of the excavation tool provided in a rock drill. FIG. 2 is a front view of the tip of the excavation tool shown in FIG. 1. It is the sectional side view and front-end | tip front view of a device. It is the sectional side view and front-end front view of a ring bit. It is a sectional side view of an engaging member. It is a sectional side view of a casing shoe. It is a sectional side view which shows engagement with a casing pipe, a ring bit, and an engaging member. It is a sectional side view of the excavation tool provided with two step parts. It is side sectional drawing of an excavation tool in the case of being used for what is called a top-the-hole hammer. It is a figure which shows the front-end | tip part of the conventional excavation tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation tool 10 Device 10a Tip of device 20 Casing pipe 30 Engagement member 40 Ring bit 40a Tip of ring bit 50 Excavation part O Center axis

Claims (5)

A casing pipe that is formed in a cylindrical shape with a built-in device that rotates around a central axis and presses an object to be excavated, and a drilling tool that includes a drilling portion provided to protrude from the tip of the casing pipe,
The excavation part includes a tip of an inner bit provided at the tip of the device and a tip of a ring bit provided at the outer periphery of the tip of the inner bit, and the ring bit is welded to the casing pipe. It is provided to be rotatable with respect to the casing pipe via a joint member ,
A casing shoe is disposed inside the casing pipe and the engaging member,
A rear end of the engaging member and a front end of the casing pipe are joined by welding, and an outer peripheral surface of the casing shoe is brought into contact with an inner peripheral surface of the casing pipe. An excavation tool, wherein a casing shoe is welded . At the rear end of the ring bit, a pressed surface that intersects the pressing direction to the excavated object is formed, and the tip of the casing shoe is in contact with the pressed surface, and the rear end of the casing shoe drilling tool according to claim 1 but characterized in that it is pressed in contact with a portion of the device.   The excavation tool according to claim 1 or 2, wherein the inner bit is configured integrally with the device.   The excavation tool according to any one of claims 1 to 3, wherein the engaging member is configured by connecting a multi-part structure member in a circumferential direction.   The uneven | corrugated | grooved part corresponding to each other is provided in the inner peripheral surface of the said engagement member, and the outer peripheral surface of the said ring bit, The Claim 1 characterized by the above-mentioned. The drilling tool described.

Images