JP3112747B2 - Self-piercing mini pipe roof construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary for stabilizing a face of a tunnel, reinforcement of a side wall in excavation of a shaft, pre-installation of a support pipe in case of insufficient ground strength, perforation for a well point, and the like. Concerning the method of construction.

[0002]

2. Description of the Related Art Conventionally, in excavation of a tunnel, a hole is drilled in the ground to prevent the top end of the excavated portion from collapsing, a reinforcing pipe is inserted into the hole, and cement is inserted into and out of the pipe. There is a method of forming rock bolts by filling milk.

[0003] In the above-mentioned construction method, in the case of a ground which is easily collapsed and has rough holes, if a pipe is to be inserted into the hole after the hole is drilled, the hole is broken and the pipe cannot be inserted. Therefore, a method of inserting the pipe 27 into the hole 41 simultaneously with the perforation was considered (FIG. 18).

However, according to this method, if the length of the pipe 27 protruding into the excavated tunnel is shortened, the drilling machine approaches the top end of the tunnel at the end of drilling, so that the installation angle θ of the pipe 27 cannot be reduced. . Also, pipe 2
If the projecting length of the pipe 7 into the tunnel is increased, the pipe 27 hits the H-shaped support steel 46 to be built next.
7 cannot be made small.

[0005]

SUMMARY OF THE INVENTION Under such circumstances,
In the method shown in FIG. 18, the installation angle θ of the pipe 27 is increased. Then, the distance from the lower surface of the hole 41 to the top of the excavated tunnel becomes large, and the ground below the hole 41 falls off as a spalling portion 60, so that extra excavation increases.

[0006] Further, the only lock bolt approaching the ground where there is a risk of peeling off is only the lock bolt applied immediately before. Therefore, it is necessary to wait until the cement milk of the lock bolt applied immediately before hardens. Cannot excavate tunnel.

Further, since the pipe 27 is also inserted into the mouth of the hole 41, the interval between the portions where the mouth coking is performed becomes small, so that it is difficult to perform caulking and it is not possible to perform the mouth coking having high pressure resistance. For this reason, the injection pressure of cement milk as a fixing material must be reduced, and the fixing of the lock bolt becomes uncertain.

The present invention has been made in view of the above-mentioned problems, and has a small installation angle θ of a pipe to prevent the ground from falling off, and can exert a reinforcing effect in a short time. A technical problem is to make a self-drilling minipipe roof construction method that is easy to perform.

[0009]

SUMMARY OF THE INVENTION A self-piercing mini-pinch according to the present invention is provided.
Ipurufu construction method, the rear end of the pipe 27 provided with a note Deana 28, a pipe insert 35 is mounted, the rod 11 provided with perforations bit 16 at the tip, rotatable on the pipe insert 35 and the pipe 27 inserted in, fitted with a rear end of the rod 11 to the rotation shaft 2 of the drilling machine 1, when drilling a hole 41 into the natural ground 40 by the drilling machine 1 simultaneously, after the pipe 27
Until the end is inserted farther from the mouth of the hole 41, the pie
After pushing the flop 27 into the hole 41, the drilling machine 1 as before
Serial rod 11 and retract the pipe insert 35,
Characterized by leaving the pipe 27 at the back of the hole 41
And

[0010]

According to the present invention, the pipe 27 is pushed into the hole 41 of the ground 40 by the pipe insertion tool 35 at the time of drilling.
The pipe 27 inserted into the hole 41 together with the drilling of the hole 41 withdraws the rod 11 and the pipe insertion tool 35 from the hole 41, and is left behind the hole 41. Pipe 27 does not exist.

Therefore, the base of the pipe 27 does not hinder the installation of the H-type supporting steel 46 or the like to be installed next. Further, since the pipe 27 is pushed through the pipe insertion tool 35, the drilling machine 1 The installation angle θ of the pipe 27 can be reduced as shown in FIG. 16 without excessively approaching the top end or the like.

When the installation angle θ of the pipe 27 is reduced, the distance from the lower surface of the hole 41 to the top end of the excavated tunnel or the like is reduced, and when the fixing material is filled and fixed in the hole 41, the mini-pipe roof is fixed. The excavation of the ground below is prevented, and the excavation is reduced.

In addition, the mini-pipe roof that prevents the ground from falling off has a small installation angle θ, and the base of the pipe roof extends along the top of the tunnel. The base of the mini-pipe roof installed before that also contributed to the reinforcement of the top.

Further, since the pipe 27 does not exist at the mouth of the hole 41, the mouth caulking 49 can be easily constructed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 17 are diagrams for explaining one embodiment of the present invention. The apparatus used in this embodiment is mainly shown in FIGS.

The drilling machine 1 used in this embodiment is formed as a drifter. The drilling machine 1 is mounted on a guide slide 3 so as to be able to slide back and forth. There is a standing riser 4 (Fig. 1).

The rotary shaft 2 of the drilling machine 1 has a sleeve 8
The sleeve 8 is formed so as to be screwed and attached to the sleeve 8, and the sleeve 8 is formed so as to be screwed and attached to the rear end of a rod 11 provided with a left thread 12 at both ends. The drill bit 16 is formed so that it can be screwed to the tip of the hole (FIG. 2).

The piercing bit 16 is shown in FIGS. 3 and 4. A projection 18 is provided at the base of the head stem 17 of the piercing bit 16.
A rotation pin 19 is provided on the head stem 17 so that the head sleeve 20 externally fitted to the head stem 17 cannot be rotated with respect to the head stem 17 and can slide back and forth within a predetermined range. It is fitted. At the tip of the head sleeve 20, a pilot bit 23 is provided.
The head sleeve 20 is provided with an enlarged bit 21. The enlarged bit 21 is located at a position where the head stem 17 is pushed into the head sleeve 20 (FIG. 3). The enlarged diameter bit 21 is formed so as to protrude to the side and to fit in the head sleeve 20 at a position where the head stem 17 is pulled out from the head sleeve 20 (FIG. 4).

A front blow hole 24 is provided at the center of the front end of the pilot bit 23, and a lateral blow hole 25 facing in a right angle direction and a rearward blow hole 25 facing obliquely rear are formed in the side surface of the pilot bit 23. A hole 26 is provided.

The piercing bit 16 can be formed with only the pilot bit 23 except for the diameter expanding bit 21. If the ground is soft even if the diameter expanding bit 21 is removed as described above, the pilot bit 23
The hole 41 drilled at the front end of the hole 41 can be enlarged to a large diameter by the horizontal blow blown out from the horizontal blow hole 25.

The pipe insertion tool 35 into which the rod 11 is rotatably inserted has the same outer diameter as the outer diameter of the pipe 27, and the tip is formed in a small diameter portion 36.
(See FIG. 1).
-Figure 5). The distal end of the pipe insertion tool 35 is not formed in the small diameter portion 36, but is formed in a large diameter, and is formed in a tapered shape in which the inner diameter of the distal end is enlarged. It can also be formed as follows. In the case where the tip of the pipe insertion tool 35 is externally fitted to the rear end of the pipe 27, even if the tip of the pipe insertion tool 35 is slightly deformed,
The tip does not crimp on the pipe 27.

Therefore, when the pipe insertion tool 35 is separated from the rear end of the pipe 27, the fitting portion does not separate and the pipe 27 can be reliably prevented from being pulled out together with the pipe insertion tool 35.

The tip of the pipe insertion tool 35 can be formed so as to be simply attached to the rear end of the pipe 27. The pipe 27 into which the rod 11 is rotatably inserted is formed of a steel pipe,
As shown in the figure, several spouting holes 28 are provided on both sides, and the spouting holes 28 are connected to the spouting hole 28 on one side and the spouting hole on the other side in order to prevent the strength of the pipe 27 from being deteriorated. The holes 28 are provided at shifted positions.

Next, a method of the embodiment of the present invention will be described. In this embodiment, as shown in FIG. 8, the boring machine 1 is retracted to the rear end of the guide slide 3, and the rotating shaft 2 of the boring machine 1 is rotated.
The sleeve 8 is attached by screwing.

Next, as shown in FIG. 9, the rod 11 is inserted into the sent riser 4, and the rear portion of the rod 11 is rotatably inserted into the pipe insertion tool 35. Then, as shown in FIG. 10, the rear end of the rod 11 is attached by screwing to the sleeve 8 attached to the rotating shaft 2, and the drill bit 16 is attached by screwing to the tip of the rod 11.

Next, the enlarged diameter bit 21 of the drill bit 16 is housed in the drill bit 16 and, as shown in FIG. 11, a pipe 27 is externally fitted to the rod 11 so that the rod 11 can rotate. The rear end of the pipe 27 is fitted to the small-diameter portion 36 at the front end of the pipe insertion tool 35 by external fitting. Next, as shown in FIG. 12, the boring machine 1 is set at a predetermined boring position according to a setting method. At this time, the guide slide 3 of the drilling machine 1 is extended, and drilling is started. For drilling, the rod 11 is rotated while the rod 11 and the pipe 27 are advanced by the drilling machine 1, and the hole 41 is drilled in the ground 40 by the drill bit 16.

In the piercing by the piercing bit 16, the slime generated by the piercing due to the rotation of the pilot bit 23 is sent backward by the front blow blown out from the front blow hole 24.

Then, the hole 41 is enlarged by the lateral blow blown out from the horizontal blow hole 25, and the slime generated by the perforation until then is blown out of the hole 41 by the backward blow blown out from the backward blow hole 26. It is what you send out.

Further, the hole 41 enlarged by the lateral blow is reliably pierced by the diameter-enlarging bit 21 into an enlarged cylindrical shape. However, when the diameter of the diameter-enlargement bit 21 is soft, as described above, the diameter-enlargement bit 21 is not always necessary.

When the drilling of the hole 41 is completed, as shown in FIG. 13, the slime 42 in the pipe 27 is discharged as shown in FIG. Until the end reaches the mouth of the hole 41, the drilling machine 1 is retracted, the rod 11 is pulled out, and the slime 42 is removed.
Is discharged. Thereby, the rear end of the pipe 27 is
1 is inserted deeper than the mouth.

Then, as shown in FIG.
Is completed, and the rod 11 and the pipe insertion tool 35 are recovered. Then, the pipe 27 is left in a portion deeper than the mouth in the hole 41 formed in the ground 40, and the perforation of the hole 41 of the self-drilling type mini pipe roof construction method and the installation of the pipe 27 as a reinforcing material are completed.

The hole 41 formed in the ground 40 as described above
The pipe 27 left inside is inserted into the hole 4 by the pipe insert 35.
1, the pipe 27 does not exist at the mouth of the hole 41 as shown in FIG. 17.

Therefore, the injection pipe 5 which is opened near the rear end of the pipe 27 (the mouth side of the hole 41) is connected to the pipe 27.
5 and an air bleeding pipe 56 that is open near the tip of the pipe 27, and between the injection pipe 55 and the outer circumference of the air bleeding pipe 56, the mirror sprayed concrete wall 48 and the like,
Fill the quick-setting cement to form the mouth caulking 49,
The mouth of the hole 41 is closed.

Next, when the cement milk is injected from the injection pipe 55, the cement milk is filled in the pipe 27, and the cement milk is injected through the injection hole 28 of the pipe 27.
Is also filled in the hole 41 outside the.

The air in the pipe 27 is directly discharged from the air release pipe 56, and the air in the hole 41 is transmitted from the pipe 2.
7 flows into the pipe 27 from the tip, and the air release pipe 5
6 to the outside. When the inside of the hole 41 and the pipe 27 is filled with cement milk, cent milk flows out of the air vent pipe 56, so that the filling of cement milk is stopped.

Since the pipe 27 does not exist at the mouth of the hole 41, the distance between the inner wall of the hole 41 and the injection pipe 55 and the air release pipe 56 increases, and the mouth caulking 49
The cement milk can be formed easily and reliably, and the filled cement milk does not leak from the mouth. Therefore, the injection pressure of the cement milk is set to a high pressure, and the minipipe roof firmly fixed to the ground can be formed.

[0037]

According to the present invention, the pipe insertion tool 35 is mounted on the rear end of the pipe 27, and the pipe 27 and the pipe insertion tool 35 are attached.
Drilling bit 16 is inserted through the rod 11 provided with, after drilling a hole 41 into the natural ground 40 by drilling bits 16, the pipe 27
Until the rear end of the pipe is inserted deeper than the mouth of the hole 41.
7 is pushed into the hole 41, and the pipe 27 is left behind the hole 41.

According to the present invention, the pipe 27 is
5, the base of the pipe 27 does not protrude out of the hole 41 because it is pushed into the hole 41. Therefore, it does not hinder the installation of the H-type support steel 46 or the like to be installed next, and the drilling machine 1 is mounted on the pipe 27 via the pipe insertion tool 35. And the installation angle θ of the pipe 27 can be reduced as shown in FIG.

When the installation angle θ of the pipe 27 is reduced, the distance from the lower surface of the hole 41 to the top of the excavated tunnel or the like is reduced. The lower ground is prevented from falling off and the excavation is reduced.

In addition, the installation angle θ of the mini-pipe roof is reduced, and the base portion extends along the top end of a tunnel or the like, so that not only the mini-pipe roof constructed immediately before but also the mini-pipe roof constructed immediately before it is constructed. The base also contributes to reinforcement of the top end and the like, and can prevent the ground from falling off.

Furthermore, since the pipe 27 does not exist at the mouth of the hole 41, the mouth caulking 49 can be easily and reliably carried out, the fixing material can be injected at a high pressure, and a mini-pipe roof firmly fixed to the ground can be formed. In addition, the ground can be prevented from falling off.

[Brief description of the drawings]

FIG. 1 is a side view of a drilling machine and the like used in an embodiment of the present invention.

FIG. 2 is a side view of a rod and the like used in one embodiment of the present invention.

FIG. 3 is a side view of a drill bit used in one embodiment of the present invention.

FIG. 4 is a side view of a drill bit used in one embodiment of the present invention.

FIG. 5 is a side view of a pipe and a pipe insert used in one embodiment of the present invention.

FIG. 6 is a side view of a pipe used in one embodiment of the present invention.

FIG. 7 is an assembly view of a rod and the like used in one embodiment of the present invention.

FIG. 8 is a diagram showing a starting state of a method according to an embodiment of the present invention.

FIG. 9 is a view showing a mounted state of a rod or a pipe insertion tool according to the embodiment of the present invention.

FIG. 10 is a diagram showing a mounting state of a drill bit according to a method of an embodiment of the present invention;

FIG. 11 is a view showing an attached state of a pipe according to a method of one embodiment of the present invention;

FIG. 12 is a diagram showing a state before the start of drilling in the method of the embodiment of the present invention.

FIG. 13 is a diagram showing a state in which perforation is completed in the method of the embodiment of the present invention.

FIG. 14 is a diagram showing a slime discharge state in the method of the embodiment of the present invention.

FIG. 15 is a view showing a state in which the rod has been extracted by the method of the embodiment of the present invention;

FIG. 16 is a diagram showing a construction state of a construction method according to an embodiment of the present invention.

FIG. 17 is a diagram showing a state in which a fixing material is filled in a hole constructed by a method according to an embodiment of the present invention.

FIG. 18 is a diagram for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling machine 2 Rotating shaft 11 Rod 16 Drilling bit 21 Diameter expansion bit 27 Pipe 28 Outlet hole 35 Pipe insertion tool 40 Ground 41 Hole θ Mini-pipe roof installation angle

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuji Tsuruta 26-5 Ikeda-Nishimachi, Neyagawa-shi, Osaka Toho Metal Co., Ltd. Neyagawa Plant (56) References JP-A-2-308087 (JP, A) JP-A-6 173 578 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/04 E21B 19/24

Claims (1)

(57) [Claims] The rear end of the 1. A pipe 27 provided with a note Deana 28 rotates, the pipe insert 35 is mounted, the rod 11 provided with perforations bit 16 at the distal end, the pipe insert 35 and the pipe 27 The rod 11 is attached to the rotating shaft 2 of the drilling machine 1 and the ground 4
And a rear end of the pipe 27 at the same time.
Until the pipe is inserted deeper than the mouth of the hole 41.
After pushing the 27 into the hole 41, retracting the drilling machine 1 and the <br/> rod 11 and the pipe insert 35, prior to
And characterized by leaving a serial pipe 27 at the back of the hole 41
Self-drilling mini pipe roof construction method.