JP3713262B2 - Double pipe drilling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double-pipe type drilling device used for drilling a rock wall on the surface surrounding a tunnel ceiling or the like when excavating a tunnel, for example. At the same time, the present invention relates to an improvement of a double-pipe type drilling device having a drilling head attached to the tip of an inner rod extending through an embedded pipe (outer pipe).
[0002]
[Prior art]
This type of drilling device is generally provided with a drilling unit that is attached to the tip of an inner rod inserted into an outer pipe (buried pipe) and exposed from the tip of the outer pipe, and this drilling unit is connected to the inner rod. The outer pipe and the inner rod are pushed into the ground while drilling in the ground by operating with a rock drilling machine, and after the drilling is finished, the inner rod is extracted from the outer rod and collected, and the outer rod is grounded (See Patent Document 1).
[0003]
In the drilling device of the prior art, the drilling unit (drill unit) consists of a drill bit (center drill) for drilling the central hole of the rock wall and a ring bit (side drill) for expanding the central hole. The drill bit is assembled to the ring bit so as to be removable from the ring bit to be left in the drill hole. Moreover, the ring bit of this drilling unit is connected to an outer pipe, the drilling bit is connected to an inner rod, and the inner rod is connected to a rock drill.
[0004]
However, this prior art drilling device manufactures the drilling bit and the ring bit of the drilling unit separately and detachably combines them, so that the work of assembling the drilling bit and the ring bit and the drilling bit Assembling work of the connecting portion for connecting the outer pipe is required, and there is a drawback that workability is low.
[0005]
Further, since the drilling bit and the ring bit are separate bodies, the manufacture of the drilling unit is complicated and expensive, and the mechanical strength between these bits is low.
[0006]
In particular, in this prior art, the ring bit is coupled to the drilling bit by a bayonet method, but the drilling impact force of the drilling bit is mutually determined by the bayonet method of the outer periphery of the drilling bit and the inner periphery of the ring bit. Therefore, the area of the transmission portion is small, the transmission efficiency of the excavation striking force is low, and therefore the excavation efficiency is low and the excavation speed per unit time is low.
[0007]
[Patent Literature]
Japanese National Patent Publication No. 8-504904
[Problems to be solved by the invention]
The problem to be solved by the present invention is for a double-pipe type drilling adapted to be able to easily manufacture a drilling unit with high strength and therefore to perform drilling work efficiently and accurately. To provide a drilling device.
[0009]
Another problem to be solved by the present invention is to provide a double-pipe type drilling device capable of drilling at a high drilling speed by transmitting a drilling striking force on a surface with a large transmission area to the drilling unit. There is.
[0010]
[Means for Solving the Problems]
The problem solving means of the present invention comprises a drilling unit attached to the tip of an inner rod surrounded by an outer pipe embedded in a drilling hole and connected to a shank rod of a rock drill, and the outer pipe, the inner rod, in a double-tube type boring drill location where the to push the outer pipe while drilling the ground by drilling unit is operated by the rock drill into the ground together with the inner rod, drilling unit, the central bore A drill bit unit for drilling a hole and a ring bit part for expanding the diameter of the central hole, and a drill unit connecting means for detachably connecting the drill unit to the inner rod. Another object of the present invention is to provide a double pipe type drilling device for drilling.
[0011]
In the problem-solving means of the present invention, the drilling unit connecting means includes a bit adapter connected to the tip of the inner rod, and the bit adapter is inserted into the drilling unit and rotated to rotate the drilling unit. A drilling unit coupling portion coupled to the adapter coupling portion may be included.
[0012]
The drilling unit connecting means further includes a casing shoe that is rotatably fitted to the bit adapter. The casing shoe is connected to the outer pipe by welding or the like, and the ring bit portion of the drilling unit. It is possible to have a ring bit coupling portion that is secured to the inner periphery but coupled so as to be rotatable.
[0013]
The drilling unit coupling portion of the bit adapter has a coupling head to be engaged with the inner end of the drilling unit, and the adapter coupling portion of the drilling unit has a vertical groove to be passed by the coupling head and the drilling unit. It preferably consists of a meshing part to be meshed with the coupling head.
[0014]
Thus, when the drilling device for double-pipe type drilling is provided with a drilling unit in which the drilling bit part and the ring bit part are integrated, the drilling bit and the ring bit are cast once (or Therefore, the drilling unit can be manufactured easily and inexpensively, and the mechanical strength between the drill bit and the ring bit is high, so that the drilling operation can be performed reliably.
[0015]
Since the bit adapter transmits the drilling striking force to the drilling unit through the contact portion between the upper end surface of the coupling head and the inner end surface of the drilling unit, the drilling striking force transmitted from the inner rod to the bit adapter is A large contact area between the coupling head and the drilling unit is transmitted to the drilling unit (an integrated body of the drilling bit part and the ring bit part). Can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described in detail with reference to the drawings. A double-pipe type drilling device 10 according to the present invention is used when excavating a tunnel 1 or the like as shown in FIGS. In order to receive the natural ground 2 in advance for the purpose of reinforcing the ground of the anchor in the pit in advance, an outer pipe (buried pipe) 12 is obliquely driven along the upper edge 3a of the face 3 to the natural ground portion 2a above it. Used to do.
[0017]
As shown in FIG. 2, a plurality of outer pipes 12 are placed side by side along the ceiling of the tunnel 1. As shown in FIG. 1, each outer pipe 12 has a predetermined length by sequentially adding a plurality of pipe units 12A1, 12A2, 12A3, and the like made of steel pipe having a length of several meters.
[0018]
In order to embed the outer pipe 12 in front of the face 3, a hollow inner rod 16 connected to the shank rod 14S of the rock drill 14 and inserted into the outer pipe 12 is used as shown in FIG. . As shown in FIG. 1, the inner rod 16 is formed by sequentially connecting a plurality of unit rods 16 </ b> A <b> 1, 16 </ b> A <b> 2, 16 </ b> A <b> 3, etc. via a coupling 18. The shank rod 14 </ b> S of the rock drill 14 is coupled to the rear end of the inner rod 16 through the shank rod coupling coupling 20.
[0019]
The double-pipe type drilling device 10 for drilling according to the present invention comprises a drilling unit 22 attached to the tip of an inner rod 16 and a drilling unit connecting means for detachably connecting the drilling unit 22 to the inner rod 16. 24.
[0020]
As shown in FIGS. 3 and 4, the hole drilling unit 22 is composed of a crown-shaped integral body of a hole drilling bit portion 26 and a ring bit portion 28 that are integrally formed with each other. The drilling unit 22 which is a crown-shaped unit is preferably made by casting steel, but can also be made by cutting. The drilling bit portion 26 and the ring bit portion 28 have cemented carbide tips 26T and 28T embedded so as to be exposed at the front end surfaces thereof. The drilling bit portion 26 has a function of drilling the central hole 2b in the rock wall of the natural ground 2, and the ring bit portion 28 has a function of expanding the diameter of the central hole 2b.
[0021]
The drilling unit connecting means 24 includes a bit adapter 30 having a female screw coupling portion 30T to which a male screw at the tip of the inner rod 16 is coupled. The bit adapter 30 is inserted into the coronal drilling unit 22 and rotated. A drilling unit coupling portion 32 coupled to the coronal drilling unit is provided. Further, the drilling unit 22 has an adapter coupling portion into which the drilling unit coupling portion 32 is inserted corresponding to the bit adapter 30 and the bit adapter 30 is coupled by relative rotation with the drilling unit coupling portion 32. 33.
[0022]
More specifically, the drilling unit coupling portion 32 of the bit adapter 30 includes a coupling head 32H that enters the drilling unit 22 and is coupled to the drilling unit 22, and the coupling head 32H is disposed below the coupling head 32H. Two arc-shaped protrusions (male meshing portions) of the drilling unit 22 to be described later have two arc-shaped recesses (female meshing portions) 32R that engage and mesh with each other. The bit adapter 30 has two vertical grooves 30G on its outer surface (see FIGS. 7 and 8). These vertical grooves 30G are described after the hole drilling unit 22 when inserted into the hole drilling unit 22. It has a function of escaping the arc-shaped ridge and a function of guiding slime generated during excavation to the outer pipe 12. The lower end of the vertical groove 30G ends before the female screw coupling portion, and has an inclined surface that guides slime to the outer pipe 12 (see FIGS. 3 and 4).
[0023]
On the other hand, the bit coupling portion 33 of the drilling unit 22 has two guide grooves 33G through which the coupling head 32H of the bit adapter 30 can pass on the inner circumference corresponding to the ring bit portion 28, and between these guide grooves 33G. consists two arcuate protrusions meshing with provided arcuate recess thereunder to retaining the coupling head 32H in (female engaging portion) 32R to engage input a bond head 32H (male engaging portion) 33P Yes.
[0024]
The bit adapter 30 screwed to the inner rod 16 is inserted into the drilling unit 22 with its coupling head 32H so that the longitudinal groove 30G faces the arc-shaped protrusion 33P of the drilling unit 22, and then together with the inner rod 16 The bit adapter 30 is rotated relative to the drilling unit 22 (in the same direction as the rotation direction during excavation) to engage the arc-shaped protrusion 33P of the drilling unit 22 and the arc-shaped recess 32R of the bit adapter 30. Accordingly, it can be seen that the bit adapter 30 is coupled to the hole drilling unit 22 in a bayonet manner through the coupling portions 32 and 33.
[0025]
In particular, it should be noted that the upper end surface of the coupling head 32H of the bit adapter 30 is engaged with the inner upper end surface of the hole drilling unit 22. The striking force at the time of excavation is transmitted from the inner rod 16 to the inner end surface of the drilling unit 22 through the upper end surface of the coupling head 32H of the bit adapter 30, while the rotational force is applied to the arc-shaped protrusion 32P of the bit adapter 30 and the cutting force. It is transmitted by meshing with the wall of the arc-shaped recess 33R of the hole unit 22.
[0026]
As shown in FIGS. 1 and 2, the drilling unit connecting means 24 further includes a casing shoe 34 that is rotatably fitted to the bit adapter 32, and the casing shoe 34 is inclined at the tip of the outer pipe 12. have opposite inclined surfaces 34C corresponding to the surface 12C, it is connected to the outer pipe 12 by welding groove portion formed between these inclined surfaces 12C and 34C. In FIG. 3, a symbol W indicates a welded portion between the casing shoe 34 and the outer pipe 12.
[0027]
The casing shoe 34 has a ring bit coupling portion 36 that is secured to the inner periphery of the ring bit portion 28 of the drilling unit 22 but is coupled so as to be rotatable. The ring bit coupling portion 36 is engaged with the annular groove 38 formed in the outer periphery of the casing shoe 34 and has a semicircular cross section, and the inner end 28F of the lower end of the ring bit portion 28 to prevent the ring bit coupling portion 36 from coming off. It consists of a flexible wire coupling member 40. The wire coupling member 40 is engaged in an annular groove 38 of the casing shoe 34 that is inserted into the ring bit portion 28 through the wire through hole 28H that opens to the outer surface of the ring bit portion 28 and penetrates into the inner space thereof. Entered.
[0028]
The bit adapter 30 and the casing shoe 34 respectively have shoulder portions 30S and 34S that engage with each other on their opposing surfaces, and these shoulder portions 30S and 34S are coupled to the drilling unit 22 with the bit adapter 30. In this state, they are engaged with each other and the pushing force from the inner rod 16 is transmitted to the outer pipe 12 via the casing shoe 34 to push the outer pipe 12.
[0029]
As shown in FIGS. 3 to 6, the drilling unit 22 is drilled in the center hole 2b with drilling water provided in the drilling bit part 26 and pumped from the inner rod 16 to the hollow part 30H of the bit adapter 30. It has a bifurcated water guide hole 42 that guides the ground to be crushed by spraying it onto the rock wall. Further, the hole drilling unit 22 has two counterflow holes 44 that are provided close to the two outlets of the water guide hole 42 and for backflowing slime that is crushed by the hole water. These backflow holes 44 communicate with the outer pipe 12 via the two vertical grooves 30G (see FIGS. 7 and 8) of the bit adapter 30, so that the slime flows back through the outer pipe 12 and is discharged. Is done.
[0030]
In this way, the drilling unit 22 attached to the tip of the inner rod 16 receives impact force and rotational force from the shank rod 14S of the rock drill 14 via the inner rod 16, as shown in FIG. At the same time, the pressure water pumped through the inner rod 16 is ejected from the water guide hole 42 of the drilling unit 22 to drill the ground portion 2a ahead of the front end opening of the outer pipe 12, and the outer pipe 12 As shown in FIG. 1, since a pushing force is received from the bit adapter 30 connected to the inner rod 16 via the casing shoe 34, the bit adapter 30 is moved forward with the drilling (drilling) by the drilling unit 22.
[0031]
After the outer pipe 12 is driven into the natural ground 2 with a predetermined length, the bit adapter 30 at the tip of the inner rod 16 is pulled out from the outer pipe 12 of the drilling unit 22, and the inner rod 16 is collected together with the bit adapter 30. To do. Therefore, the integral drilling bit portion 26, ring bit portion 28, and casing shoe 34 of the drilling unit 22 remain left in the ground. Since the bit adapter 30 inserted into the drilling unit 22 is removed from the drilling unit 22 and collected, it is possible to minimize material left behind in the ground and reduce waste of material costs. I understand.
[0032]
Thereafter, an injection pipe connected to an injection machine for injecting an injection material such as silica resin (not shown) through a hose is drawn into the outer pipe 12, and the injection material is filled into the outer pipe 12, and a part of the injection pipe is filled with the outer pipe. It leaks around the outer pipe 12 through a large number of discharge holes (not shown) of the pipe 12, and hardens the injection material inside and outside to receive the ground portion 2 a in front of the face 3.
[0033]
In the above embodiment, the bit adapter 30H has two longitudinal grooves 30G, and the drilling unit coupling portion 32 has two arc-shaped recesses 32R, and accordingly the adapter of the drilling unit 22 The coupling portion 33 includes two arc-shaped protrusions 33P, but the number thereof may be three or more.
[0034]
【The invention's effect】
According to the present invention, as described above, the drilling bit part in which the drilling unit drills the central hole and the ring bit part that expands the central hole drilled by the drilling bit are integrated. Since the drill bit and ring bit can be manufactured by a single process such as casting, the drilling unit can be manufactured easily, and therefore, even if the drill bit is left in the ground, it is generally inexpensive. In addition, the mechanical strength between the drilling bit portion and the ring bit portion is high, and the drilling operation can be performed reliably without destroying the drilling unit that receives a large impact.
[0035]
In particular, since the bit adapter transmits a striking force to the drilling unit through the contact portion between the upper end surface of the coupling head and the inner end surface of the drilling unit, the striking force transmitted from the inner rod to the bit adapter is A large contact area between the coupling head and the drilling unit is transmitted to the drilling unit (an integrated body of the drilling bit part and the ring bit part). Therefore, the impact force received by the entire drilling unit is high and the drilling speed is improved. can do.
[Brief description of the drawings]
FIG. 1 is a schematic sectional side view illustrating a state in which one outer pipe (buried pipe) is buried while excavating the ground using the drill device of the present invention.
FIG. 2 is a schematic front sectional view for explaining the state of FIG. 1 from the front.
FIG. 3 is an enlarged longitudinal sectional view of a main part of the drill device of the present invention.
4 is a longitudinal sectional view of an exploded state of a drilling unit used in the drill device of FIG. 3;
FIG. 5 is a front view of the hole drilling unit of FIG. 3;
6 is a rear view of the hole drilling unit of FIG. 3;
7 is a cross-sectional view taken along line VII-VII in FIG.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tunnel 2 Ground mountain 2a Ground mountain part 2b Drilling hole part 3 Face 4 Support work 10 Drill apparatus 12 Outer pipe (buried pipe)
12A1 Pipe unit 12A2 Pipe unit 12A3 Pipe unit
12C inclined surface 14 rock drill 14S shank rod 16 hollow inner rod 16A unit rod 18 coupling 20 shank rod coupling coupling 22 drilling unit 24 drilling unit connecting means 26 drilling bit portion
26T Carbide Tip 28 Ring Bit 28H Wire Through Hole
28T Carbide Chip 30 Bit Adapter 30H Hollow Hole
30T female thread coupling part 30G vertical groove
30S shoulder 32 drilling unit coupling portion 32H coupling head 32R arc-shaped recess (female meshing portion)
33 Bit adapter coupling portion 33G Guide groove 33P Arc-shaped protrusion (male meshing portion)
34 Casing shoe
34C opposite slope
34S shoulder portion 36 ring bit joint portion 38 annular groove 40 wire joint member 42 bifurcated water guide hole 44 backflow hole
W weld

Claims (4)

A drilling unit is attached to the tip of an inner rod that is connected to a shank rod of a rock drill surrounded by an outer pipe embedded in the drilling hole, and the outer pipe and inner rod are operated by the rock drill. Then, in the double pipe type drilling device for drilling the outer pipe with the inner rod while drilling the ground with the drilling unit, the drilling unit drills the central hole. consists integrally of coronary the ring bit portion whose diameter increases the central hole and drilling bit portion which, in that the boring unit includes a drilling unit connection means for removably connected to said inner rod Features a double-pipe drilling device for drilling.   2. The double-pipe type drilling device for drilling according to claim 1, wherein the drilling unit connecting means includes a bit adapter connected to a tip of the inner rod, and the bit adapter is connected to the drilling unit. A double-pipe drilling device having a drilling unit coupling portion coupled to an adapter coupling portion of the drilling unit by inserting / rotating into the drilling unit.   The double-pipe type drilling device for drilling according to claim 2, wherein the drilling unit connecting means further includes a casing shoe rotatably fitted to the bit adapter, A double-pipe type cutting machine comprising a ring bit coupling portion connected to the outer pipe and secured to the inner periphery of the ring bit portion of the drilling unit, but coupled so as to be rotatable. Drilling device for holes.   The double-pipe drilling device for drilling according to claim 2 or 3, wherein the drilling unit coupling portion of the bit adapter has a coupling head to be engaged with an inner end of the drilling unit, The adapter coupling portion of the drilling unit is composed of a vertical groove through which the coupling head passes and a meshing portion to be meshed by relative rotation with respect to the coupling head of the drilling unit. Drilling device for system drilling.

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