JP2000337079A - Double pipe type drilling method, device therefor, and buried pipe pushing adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely push a buried pipe into the ground, without causing deformation and breaking of the connection between a buried pipe, the shank rod of a rock drill and an inner rod nor causing noises nor failing to push the buried pipe, by pushing the buried pipe without the intervention of the shank rod. SOLUTION: A pushing adapter 32 provided in such a way as to surround a striking coupling 20 is disposed between the rear end face of a buried pipe 10 and the body end face of a rock drill 12 and the feeding power of the rock drill 12 is directly transmitted to the buried pipe 10 to push the buried pipe 10 into the ground. The striking force and rotating force of the shank rod 14 of the drill 12 are imparted to an inner rod 16 via the striking coupling 20, whereby drilling is effected using a drilling bit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, excavating a tunnel, drilling a plurality of buried pipes such as steel pipes into a rock wall on the surface surrounding the ceiling or the like of the tunnel while drilling and receiving. Regarding the drilling method used in the above, in more detail, drilling bits attached to the tip of the inner rod inserted into the buried pipe are exposed from the tip of the buried pipe and operated by a rock drill. The present invention relates to an improvement of a double-pipe drilling method in which a buried pipe and an inner rod are pushed in while drilling, and after the drilling, the inner rod is pulled out from the buried pipe and collected.

[0002]

2. Description of the Related Art In this type of double-pipe drilling method, a drill bit that is attached to the tip of an inner rod inserted into a buried pipe and exposed from the tip of the buried pipe is operated by a rock drill. In this method, the buried pipe and inner rod are pushed into the ground while drilling the inside, and after the drilling, the inner rod is extracted from the buried pipe and collected, and the buried pipe is buried underground.

When this method is used as a precedent method for tunnel excavation work, an injection material such as silica resin is then injected into a buried pipe buried underground, and this injection material is injected into the buried pipe. And hardens around the buried pipe by diffusing to the outside of the buried pipe through the discharge hole of the buried pipe to reinforce the ceiling and side walls of the tunnel.

In one prior art double pipe drilling method, as shown in FIG. 11, an inner rod 16 is connected to a shank rod 14 of a rock drill 12 and the impact force of the shank rod 14 is reduced. The drilling bit 22 attached to the tip is driven while receiving the torque and the rotational force. The buried pipe 10 receives the impact force and the rotational force from the impact coupling 20 connecting the shank rod 14 and the inner rod 16. The rocking drill 1 receives the impact force and the rotational force from the shank rod 14 of the rock drilling machine 12 by engaging the tip shoulder 40a of the driving jig 40 with the rear end face 10a of the buried pipe 10.
2 and pushed into the ground (see, for example, JP-A-8-121073).

However, in this prior art, since the driving jig 40 hits the rear end face 10a of the buried pipe 10 by receiving the impact force from the shank rod 14 of the rock drill 12, the buried pipe 10
Is easily deformed, noise is generated when the burial pipe 10 is hit, and the driving jig 40 further strikes the rear end face of the buried pipe 10 in reaction to the impact force of the driving jig 40.
May tend to come off from the rear end face 10a of the buried pipe 10, which may cause a failure in pushing the buried pipe 10. Also,
Although not shown, a short rod is used between the shank rod 14 and the inner rod 16, and the driving jig 40 may be connected to the short rod.
In this case, the short rod is the inner rod 1
Since the pushing force of the buried pipe 10 is also borne in addition to the pushing force of the drill bit 6 and the drill bit 22, there is a possibility that a large load is applied to the connecting portion and the portion is deformed or damaged.

[0006]

SUMMARY OF THE INVENTION One problem to be solved by the present invention is to make it possible to push a buried pipe without passing through a shank rod so that a connection between a buried pipe and a connecting portion between a shank rod and an inner rod is made. An object of the present invention is to provide a double-pipe type drilling method capable of reliably pushing a buried pipe into the ground without causing deformation and damage, generating noise, and failing to push the buried pipe.

Another problem to be solved by the present invention is that the buried pipe can be pushed in without using a shank rod so that the buried pipe and the connecting portion between the shank rod and the inner rod are deformed and damaged, and noise is reduced. It is an object of the present invention to provide a buried pipe pushing apparatus for a double pipe drilling method, which can surely push a buried pipe into the ground without generating or failing to push the buried pipe.

Still another problem to be solved by the present invention is that the buried pipe is pushed in without passing through the shank rod to deform and break the buried pipe and the connecting portion between the shank rod and the inner rod, to generate noise, and to bury the buried pipe. An object of the present invention is to provide a buried pipe pushing adapter for a double pipe drilling method, which is used to securely push a buried pipe into the ground without causing a failure of pushing.

[0009]

SUMMARY OF THE INVENTION A first object of the present invention is to attach to a tip of an inner rod inserted into a buried pipe and connected to a shank rod of a rock drill and to be exposed from the tip of the buried pipe. The burial pipe and inner rod are pushed into the ground by a double pipe method while drilling the ground by operating a drill bit with a rock drill, and after drilling is completed, the inner rod is pulled out from the buried pipe and collected. In the double pipe drilling method, the rear end face of the buried pipe and the end face of the rock drill body are connected via the feed force transmission means to transmit the feed force of the rock drill to the buried pipe and the buried pipe is grounded. The present invention provides a double-pipe drilling method characterized in that a drilling bit is drilled by applying a striking force and a rotational force of a shank rod of an excavator to an inner rod on the other hand. .

A second object of the present invention is a double-pipe drilling method according to the first object, wherein the feed force transmitting means comprises a shank rod of a rock drill and the shank rod and inner shaft. Consists of a push-in adapter disposed between the end face of the rock drill body and the buried pipe so as to surround the striking coupling connecting the rod, so that the feed force of the rock drill is transmitted to the buried pipe via the push-in adapter. It is another object of the present invention to provide a double-pipe drilling method characterized by the following.

A third object of the present invention is to provide a double-pipe drilling method according to the second object of the present invention, wherein a hole between a push-in adapter and a rock drill or between a push-in adapter and a buried pipe is provided. The present invention is to provide a double-pipe type drilling method characterized by disposing an interval adjusting collar in a hole.

A fourth object of the present invention is to provide a double-pipe drilling method according to the second object of the present invention, wherein the push adapter is inserted into the underground to a predetermined depth at the rear end of the buried pipe. It is another object of the present invention to provide a double-pipe drilling method characterized in that the pipe is driven into the ground together with a buried pipe until it is pushed in, and after the drilling is completed, the push-in adapter is recovered from the ground.

A fifth object of the present invention is to provide a drilling bit which is inserted into a buried pipe and is attached to a tip of an inner rod connected to a shank rod of a rock drill and exposed from the tip of the buried pipe. A buried pipe pushing device for a double pipe drilling method, in which a buried pipe and an inner rod are pushed into the ground by a double pipe method while drilling the ground by operating a machine, A feed force transmitting means for transmitting a feed force of the rock drill is provided on the rear end face, and the feed force transmitting means surrounds the shank rod of the rock drill and the hitting coupling connecting the shank rod and the inner rod. A double-pipe drilling machine, characterized in that the push-in adapter is arranged between the end face of the drilling machine and the buried pipe and transmits the feed force of the rock drill to the buried pipe. And to provide a use buried pipe pushing device.

According to a sixth aspect of the present invention, there is provided a buried pipe pushing adapter used in a double pipe type drilling method according to the first aspect or a buried pipe pushing apparatus according to the fifth aspect. A rock drill shank rod and an adapter body disposed between the end face of the rock drill body and the buried pipe so as to surround the sleeve connecting the shank rod and the inner rod, and bury the feed force of the rock drill. An object of the present invention is to provide a buried pipe pushing adapter for a double pipe type drilling method, which is transmitted to a pipe.

As described above, the power transmission system for pushing the buried pipe and drilling the inner rod is separated, and the inner rod drills by receiving power from the shank rod of the rock drill.
When the buried pipe is pushed by using the feed force (propulsion force) of the rock drill, the striking force and the rotating force from the shank rod of the rock drill are not applied to the buried pipe, and therefore the In addition to not causing deformation or breakage of the end surface, there is no generation of noise, and the pushing force does not come off from the buried pipe due to the recoil of the impact, so that the buried pipe can be pushed securely into the ground. .

Further, if the impact force from the shank rod of the rock drill is not applied to the buried pipe, no excessive force is applied to the portion connecting the shank rod and the inner rod, and therefore, there is no breakage between them. Therefore, the double-pipe drilling operation can be performed efficiently and reliably.

The push-in adapter can appropriately adjust the gap between the rear end face of the burial pipe and the end face of the rock drilling machine by using the gap adjusting collar in combination, and therefore, the feeding force of the rock drilling machine can be adjusted. Can be transmitted reliably.

Further, the pushing adapter is driven into the ground together with the buried pipe until the last end of the buried pipe is pushed into the ground to a predetermined depth, and after the drilling is completed, the pushed adapter is recovered from the ground. Can be driven into a position higher than a shoring used for excavating a tunnel, for example, so that tunneling work such as concrete lining work can be easily performed thereafter.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. The present invention typically employs a method for excavating a tunnel 1 or the like as shown in FIGS. In order to reinforce the ground deep inside the pit in advance and to receive the ground 2 in advance, many buried pipes 10 are obliquely driven along the upper edge 3a of the face 3 in the ground part 2a above the face 3a. As shown in FIG. 3, each buried pipe 10 has a predetermined length by sequentially adding a plurality of buried pipe units 10A made of steel pipes each having a length of several meters. In the example of FIG. 1, three buried pipe units 10A1,
10A2 and 10A3 are sequentially added to one buried pipe 1
0 is formed.

As will be described later, after the buried pipe 10 is buried along the upper edge 3a of the face 3 by the rock drill 12 mounted on the jumbo 24, a predetermined injection material is injected through the buried pipe 10. After the injection material is hardened and the ground portion 2a is received in advance, the excavator (not shown) which is replaced with the jumbo 24 and enters the tunnel 1 enters the tunnel 1.
The face 3 is moved forward by digging, and a support 4 is applied every time the face 3 advances.

In order to bury the buried pipe 10 in front of the cutting face 3, as shown in FIGS. 3 and 4, a hollow pipe connected to the shank rod 14 of the rock drill 12 and inserted into the buried pipe 10 is used. An inner rod 16 is used. The inner rod 16 is formed by sequentially connecting a plurality of unit rods 16A via a coupling 18 as shown in FIG. The shank rod 14 of the rock drill 12 has a striking coupling 2
0 is connected to the rear end of the inner rod 16.

As shown in FIG. 3, a drill bit 22 is attached to the tip of the inner rod 16, and the drill bit 22 transmits a striking force and a rotational force from the shank rod 14 of the rock drill 12 via the inner rod 16. In response to this, the ground portion 2a in front of the tip opening of the buried pipe 10 is drilled, and the buried pipe 10 is buried by moving forward through the drilled portion.

The rock drill 12 and the buried pipe 10 are mounted on a feeder 28 held on a boom 26 of a jumbo 24, as shown in FIG.
Is pushed by the feed force (propulsive force) of the feeder 28 while being pushed into the drilled portion of the ground 2 by a method described later.

Although not shown, drilling water is supplied through the inner rod 16, and slime generated as the drilling progresses is fed through the inner rod 16 and discharged from the drill bit 22. The water flows backward through the buried pipe 10 due to the pore water and is discharged. As shown in FIG.
Is cast into the ground 2 with a predetermined length, and then the inner rod 1
6 is withdrawn from the buried pipe 10 and collected.

Thereafter, an injection pipe connected via a hose to an injection machine (not shown) for injecting an injection material such as silica resin is drawn into the buried pipe 10, and the injection material is filled into the buried pipe 10. The part is leaked around the buried pipe 10 through a large number of discharge holes (not shown) of the buried pipe 10, the injected material inside and outside is hardened, and the ground portion 2 a in front of the face 3 is received first.

As shown in FIGS. 4 and 5, the drilling method according to the present invention employs a feed force transmitting means 30 disposed between the rear end face 10a of the buried pipe 10 and the main body end face 12a of the rock drill 12.
Thus, the feed force of the feeder 28 of the jumbo 24 is transmitted to the buried pipe 10 via the rock drill 12 to push the buried pipe 10 into the ground 2.

As shown in FIG. 4, the feed force transmitting means 30 includes a shank rod 14 of the rock drill 12, a striking coupling 20 for connecting the shank rod 14 and the inner rod 16, and an inner rod 16. And a push adapter 32 disposed between the rock drill 12 and the buried pipe 10 so as to surround the rock drill 12. The push adapter 32 has a function of transmitting a feed force applied from the feeder 28 of the jumbo 24 to the rock drill 12 to the buried pipe 10. The push adapter 32 is used for the shank rod 1.
Depending on the length of the rod 4, it may be arranged so as to surround only the shank rod 14 and the striking coupling 20, but this is the case where the rear end of the inner rod 16 enters the buried pipe 10. .

As shown in FIG.
Consists of an adapter body 32A in the form of a sleeve, the rear end face 32a of which engages with the body end face 12a of the rock drill 12 and the shoulder 32c of its front end 32b engages with the rear end face 10a of the buried pipe 10. , Small diameter portion 32 forward of shoulder 32c
d is fitted into the inner periphery of the rear end of the buried pipe 10. still,
In FIG. 5, reference numeral 33 denotes a discharge hole provided in the adapter main body 32A of the push-in adapter 32 to discharge the slime flowing backward in the buried pipe 10.

Next, a method of burying the buried pipe 10 by the double-pipe drilling method of the present invention will be described. As shown in FIG. 5, the shank rod 14 of the rock drill 12 is embedded in the buried pipe 10.
Of the rock drilling machine 12 by inserting the drilling bit 22 attached to the tip of the inner rod 16 through the tip opening of the buried pipe 10. 14 hitting forces F1
And the rotational force F2 is transmitted to the drill bit 22 via the inner rod 16 to drill the ground portion 2a. Accordingly, the inner rod 16 and the drill bit 22 are advanced by the feed force of the feeder 28 mounted on the boom 26 of the jumbo 24 while being driven by the shank rod 14 of the rock drill 12 (see FIG. 6B).

On the other hand, at the rear end of the buried pipe 10, as shown in FIGS.
6 and a push-in adapter 32 is fitted toward the front of the body of the rock drilling machine 12 so as to surround the hitting coupling 20 and its front and rear portions, and a shoulder 32c of a front end 32b of the push-in adapter 32 has a rear end face of the buried pipe 10. The small diameter portion 32d is fitted into the inner peripheral surface of the rear end of the buried pipe 10 so as to engage with 10a. In this way, the push-in adapter 3
2 is arranged between the rear end face 10 a of the buried pipe 10 and the main body end face 12 a of the rock drill 12.

Therefore, the buried pipe 10 does not receive the striking force F1 and the rotating force F2 of the shank rod 14 of the rock drilling machine 12, and is formed by drilling a hole 2b (see FIG. The rock drill 12 is pushed in the inside by the feeder force (feeder force) F3 (see FIG. 6A). As described above, the inner rod 16 moves forward by receiving the feed force from the rock drill 12 together with the buried pipe 10, and the inner rod 16 drives the drill bit 22 while receiving the forward movement. Drilling of bit 22, inner rod 16 and buried pipe 10
Will be performed at the same time.

As described above, since the buried pipe 10 is formed by connecting a plurality of buried pipe units 10A, the first buried pipe unit 10A1 is pushed into the ground portion 2a and the rear end thereof is cut into the face 3. When approaching, the next buried pipe unit 1
0A2 is connected to the previous buried pipe unit 10A1 and is pushed into the ground portion 2a. Similarly, the next (last in the illustrated example) buried pipe unit 10A3 is connected to the buried pipe unit 10A2 and It is pushed into the part 2a. Adjacent buried pipe units 10A may be connected by screw connection, or a small diameter portion in front of a not-shown front end shoulder (step) of the buried pipe unit 10A at the rear end of the buried pipe unit 10A at the front. And may be connected by taper fitting or other appropriate connecting means.

In particular, the final buried pipe unit 10A3 is
It is preferable to be connected to the buried pipe unit 10A2 in a fitting manner. The reason is that, in this way, the final buried pipe unit 10A3 is
A2 can be easily pulled out from the drilled portion. In this case, the rear end of the buried pipe 10 does not protrude downward from the support 4 and remains there. This is advantageous because Of course, construction can be performed without pulling out the last buried pipe unit 10A3.

On the other hand, the inner rod 16 can have a length corresponding to the length of the buried pipe 10 by successively adding a plurality of unit rods 16A.
Are screwed together by a coupling 18.

As can be seen from FIG. 3, the buried pipe unit 10
When the length of A and the length of the unit rod 16A do not match, the shank rod 14 of the rock drill 12 is
6, the distance D between the front end face 12a of the rock drill 12 and the rear end face of the buried pipe 10 changes, so that the length of the buried pipe unit 10A and the unit rod 16A are corresponding. Is preferred. However, it is difficult to completely match the length of the buried pipe unit 10A and the length of the unit rod 16A, and if these mismatches are not so large, as shown in FIG. Distance adjusting collar 34 between the main body front end face 12a
May be inserted. The gap adjusting collar 34 may be inserted in a shoulder engagement manner between the shoulder 32 c of the front end 32 b of the push adapter 32 and the rear end face of the buried tube 10.

Also, as shown in FIG. 8, the push adapter 32 is unitized so that two or more push adapter units 32U can be added according to the change in the interval D. Further, as shown in FIG. The push-in adapter unit 32U and the spacing adjustment collar 34 may be combined.

In the above embodiment, the push adapter 3
2 is not pushed into the ground part 2a,
Although it was used in a state where it protruded backward from the face of the face 3, as shown in FIG.
The push-in adapter 32 may be pushed into the ground so that the rear end face 3 is driven above the shoring 4, and after the drilling, the push-in adapter 32 may be pulled out from the ground and collected. In this way, the push-in adapter 32 can serve to drive the final buried pipe unit 10A3 so as to match the shoring 4, so that the concrete lining work on the inner surface of the tunnel is facilitated thereafter, which is advantageous. It is.

[0038]

According to the present invention, as described above, the power transmission system for pushing the buried pipe and drilling the inner rod is separated, and the inner rod receives power from the shank rod of the rock drilling machine. The drilling is performed, and the buried pipe is pushed by using the feed force received by the rock drill, so that the burial pipe does not receive the impact force or the rotation force from the shank rod of the rock drill, Therefore, the end face of the buried pipe will not be deformed or damaged, no noise will be generated, and the pushing force will not come off from the buried pipe due to the recoil of the impact. You can push it.

Further, since the impact force from the shank rod of the rock drill is not applied to the buried pipe, no excessive force is applied to the portion connecting the shank rod and the inner rod, and therefore these portions are not applied. The breakage does not occur, and the double-pipe drilling operation can be performed efficiently and reliably.

The push-in adapter can be suitably adjusted to the gap between the rear end face of the buried pipe and the front end face of the rock drill by using the gap adjusting collar together.
The feed force of the rock drill can be reliably transmitted to the buried pipe.

Further, the push-in adapter is driven into the ground together with the buried pipe until the last end of the buried pipe is pushed into the ground to a predetermined depth. After the drilling is completed, the push-in adapter is recovered. Can be driven above a shoring used for excavating a tunnel, for example, so that tunneling work such as concrete lining work can be easily performed thereafter.

[Brief description of the drawings]

FIG. 1 is a schematic sectional side view illustrating a state where a tunnel is excavated by using the method of the present invention.

FIG. 2 is a schematic front sectional view illustrating a state where a tunnel is excavated using the method of the present invention from the front of FIG. 1;

FIG. 3 is an enlarged vertical sectional view of one buried pipe cast in the ground.

FIG. 4 is a partial vertical sectional view of a disassembled state of a feed force transmitting means used in the method of the present invention.

FIG. 5 is a longitudinal sectional view of an assembled state of the feed force transmitting means used in the method of the present invention.

6A and 6B illustrate a state in which a buried pipe and an inner rod are driven by the method of the present invention. FIG. 6A is a schematic explanatory view illustrating a state in which the buried pipe is pushed in, and FIG. It is a schematic explanatory view explaining a state.

FIG. 7 is a longitudinal sectional view when the feed force transmitting means is formed by using a press-fit adapter together with an interval adjusting collar.

FIG. 8 is a longitudinal sectional view in a case where the feed force transmitting means is composed of two or more push-in adapter units that are combined according to a change in the distance between the buried pipe and the rock drill.

FIG. 9 is a longitudinal section in the case where the feed force transmitting means is formed by combining two or more push-in adapter units combined in accordance with a change in the gap between the buried pipe and the rock drill and the gap adjusting collar. FIG.

FIG. 10 is a schematic cross-sectional view of a usage example in which a pushing adapter is pushed into the ground so as to push the last end of a buried pipe to a height position of a support.

FIG. 11 is a longitudinal sectional view showing a state in which a buried pipe and an inner rod are driven by a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel 2 Ground 2a Ground 2b Drilling part 3 Face 10 Buried pipe 12 Rock drill 14 Shank rod 16 Hollow inner rod 16A Unit rod 18 Coupling 20 Striking coupling 22 Drilling bit 24 Jumbo 26 Boom 28 Feeder Reference Signs List 30 feeder force transmitting means 32 push-in adapter 32A adapter body 32U push-in adapter unit 32a rear end 32b front end 32c shoulder 32d small diameter portion 34 interval adjustment collar 40 driving jig 40a tip shoulder

Claims (6)

[Claims] 1. A drill bit that is inserted into a buried pipe and is attached to a tip of an inner rod connected to a shank rod of a rock drill, and is exposed from the tip of the buried pipe by the rock drill to operate underground. In the double-pipe drilling method, the buried pipe and the inner rod are pushed into the ground by a double pipe method while drilling, and after the drilling, the inner rod is extracted from the buried pipe and collected. The rear end face of the burial pipe and the main body end face of the rock drill are connected via feed force transmitting means to transmit the feed force of the rock drill to the buried pipe to push the buried pipe into the ground. A double-pipe drilling method, wherein a drilling bit is drilled by applying a striking force and a rotating force of a shank rod of the excavator to the inner rod. 2. The drilling method according to claim 1, wherein said feed force transmitting means includes a shank rod of said rock drill and a percussive coupling for connecting said shank rod and an inner rod. Comprising a pushing adapter disposed between the end face of the rock drill body and the buried pipe so as to surround the rock drill, and transmitting the feed force of the rock drill to the buried pipe via the pushing adapter. A double pipe method for drilling. 3. The double-pipe drilling method according to claim 2, wherein a gap adjusting collar is arranged between the push-in adapter and the rock drill or between the push-in adapter and the buried pipe. A double-pipe drilling method. 4. The double-pipe drilling method according to claim 2, wherein the push-in adapter is sunk together with the buried pipe until the rearmost end of the buried pipe is pushed into the ground to a predetermined depth. A double-pipe drilling method, wherein the pushing adapter is recovered from the ground after the drilling is completed. 5. A drill bit that is inserted into a buried pipe and is attached to a tip of an inner rod connected to a shank rod of a rock drill and is exposed from the tip of the buried pipe by the rock drill to operate underground. A buried pipe for a double pipe type drilling method, wherein the buried pipe and the inner rod are pushed into the ground by a double pipe method while drilling holes. A feed force transmitting means for transmitting a feed force of the rock drill, wherein the feed force transmitting means surrounds the shank rod of the rock drill and a percussion coupling connecting the shank rod and the inner rod; A double pipe comprising a push adapter disposed between an end face of a main body and the buried pipe, wherein the push adapter transmits a feed force of the rock drill to the buried pipe. Buried pipe pushing equipment for drilling method. 6. A buried pipe pushing adapter used in the buried pipe pushing apparatus according to claim 1 or the buried pipe pushing apparatus according to claim 5, wherein the shank rod and the shank of the rock drilling machine are provided. An adapter body is disposed between the rock drill and the buried pipe so as to surround a percussion coupling connecting the rod and the inner rod, and transmits a feed force of the rock drill to the buried pipe. A buried pipe pushing adapter for a double pipe drilling method.