JP2000220376A - Pipe roof method - Google Patents

Abstract

(57) [Summary] [Problem] To extend a long excavation or pipe,
Provided is a construction method that can be performed with high precision along the planned excavation line regardless of the curve, and that can efficiently install multiple adjacent pipes. SOLUTION: A drill hole (H) for building a pipe using a long drill rod (12) and a drill bit (22).
Is excavated, a long pipe (14) is built in the borehole (H), a predetermined number of pipes (14) are built, and then an injection material (MS) is injected into and out of the pipe (14). When drilling the drill hole (H), the drill rod (1) is fixed along the scheduled line (TV) of the pipe roof while correcting the drilling trajectory.
2) and the drill bit (22) are advanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe roof construction method, and more particularly to a pipe roof construction method in which a plurality of pipes are erected along a predetermined line of a pipe roof and above a cross section of the tunnel before excavating the tunnel. .

[0002]

2. Description of the Related Art Such a pipe roof construction method is widely used because it can excavate a tunnel or the like safely and reliably in a construction environment where it is difficult to support the pipe roof construction method.

FIG. 20 shows an outline of a tunnel pipe roof construction method by a pipe roof construction method, and is arranged above or around a region PT corresponding to a tunnel cross section to be excavated along a predetermined line TV of a pipe roof. 3 shows a state in which a plurality of pipes 14. By constructing a plurality of pipes 14..., It functions as a roof that supports the earth pressure above or around the tunnel, thereby making the operation inside the tunnel safe.

However, in the conventional pipe roof method, drilling accuracy is poor and direction control during drilling cannot be performed. Therefore, when a long drilling is performed, the position of the drilling hole is separated from a desired position. The problem exists. For example, as shown in FIG. 20, out of the plurality of pipes 14, the pipes are separated from the planned line TV of the pipe roof as shown by a two-dot chain line, and function as a pipe roof. Becomes difficult.

Conventionally, as shown in FIG. 21, widened portions W are provided intermittently, and pipes are laid every short section between the widened portions W. However, as a result of building pipes every short section, drilling holes, building pipes, injecting mortar and cement milk
Work must be repeated many times,
The labor expended in the work is enormous. Furthermore, in the conventional pipe roof method, the curved portion cannot be constructed with a few exceptions, and the construction is performed only on the straight portion.
Exceptionally, the method of constructing the curved portion is performed only when the diameter of the pipe is large, and the construction cost is high. Therefore, at present, it is not practically used.
In FIG. 22, when the scheduled line TV of the pipe roof is curved, the end 14E of the straight pipe 14 is separated from the scheduled line of the pipe roof, and functions as a pipe roof. Things become difficult.

As another prior art, for example, there is a fore-piling method. However, in the fore-piling method, it is necessary to change the setup for drilling, excavating and supporting. In addition, as shown in FIG. 23, the fore piling method requires an extra excavation part ADC, but the extra excavation part ADS
The cost of processing large amounts of excavated soil and the cost of the injecting agent to be injected into the excavated area cannot be ignored.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and is not limited to excavation or pipe laying in a straight line or a curved line.
An object of the present invention is to provide a pipe roof construction method that can be performed with high precision along a predetermined line of a pipe roof having a long distance exceeding 0 m and that does not generate a surplus portion for excavation.

[0008]

As a result of various studies, the inventor measured a drilling position with a measuring instrument, and pushed and pulled a long drill rod with a horizontal hole drilling machine while correcting the drilling direction or the drilling trajectory. By applying the so-called “lead drill method” in which the ground is excavated (or drilled) by rotating the ground, it is judged to be extremely effective for the pipe roof method by the pipe roof method or the fore-piling method.

According to the pipe roof method of the present invention, a step of drilling a drill hole for pipe installation using a drill rod and a drill bit, a step of installing a pipe in the drill hole drilled by the step, Injecting an injection material into and out of the pipes after the number of pipes has been built.In the step of excavating the excavation hole, a drill rod and a drill bit are fixed along a predetermined line of the pipe roof while correcting a drilling trajectory. It is characterized by progress.

In the pipe roof method according to the present invention, a drill rod having a drill bit at a tip is inserted into a pipe,
Excavating the ground in a state where the drill bit protrudes from the tip of the pipe, simultaneously excavating a drill hole for pipe installation and installing the pipe, collecting a drill rod and a drill bit, Injecting the injection material into and out of the pipes after the number of pipes has been installed.In the excavation and installation process, advance the drill rod and pipe along the planned line of the pipe roof while correcting the excavation trajectory. It is characterized by being confused.

Further, according to the pipe roof construction method of the present invention, a drill rod having a drill bit at the tip is inserted into the pipe, and the ground is drilled in a state where the drill bit protrudes from the tip of the pipe. A step of simultaneously drilling a hole and laying a pipe; a step of separating a drill bit from a drill rod to collect a drilling knit other than a drill bit; and In the step of excavating and erection, the drill rod and the pipe are advanced along the scheduled line of the pipe roof while correcting the excavation trajectory.

The pipe roof method according to the present invention comprises the steps of: drilling a drill hole for building a pipe using a drill rod and a drill bit; and injecting an injection material into the drill hole drilled by the step. Erecting a pipe in a drill hole filled with the injection material, wherein the step of drilling the drill hole advances a drill rod and a drill bit along a predetermined line of the pipe roof while correcting a drilling trajectory. It is characterized by having.

[0013] Alternatively, the pipe roof method of the present invention uses a drill rod and a drill bit and a step of drilling a drilling hole for pipe installation in a state filled with muddy water mixed with an injecting material, and drilling by the step. Erecting a pipe in the borehole, wherein the step of drilling the borehole advances the drill rod and the drill bit along a predetermined line of the pipe roof while correcting the drilling trajectory. .

In addition to the above, according to the pipe roof construction method of the present invention, a drill rod having a drill bit at a tip is inserted into a pipe, and muddy water mixed with an injection material is mixed with the drill bit protruding from the tip of the pipe. Excavating the ground in the filled state, including a step of simultaneously injecting an injection material, excavating a drill hole for pipe installation and installing a pipe, and a step of collecting a drill rod and a drill bit; In the step of excavation and erection, the drill rod and the pipe are advanced along the scheduled line of the pipe roof while correcting the excavation trajectory.

In the pipe roof method according to the present invention, a drill rod having a drill bit at a tip is inserted into a pipe.
The ground is excavated with the drill bit protruding from the end of the pipe and filled with muddy water mixed with the injection material, and injection of the injection material, excavation of a drill hole for pipe installation, and installation of the pipe are performed. Including the step of performing simultaneously and the step of separating the drill bit from the drill rod and recovering the drilling knitting other than the drill bit, the step of performing injection, drilling and erection along the scheduled line of the pipe roof while correcting the drilling trajectory The drill rod and the pipe are advanced.

In practicing the present invention, if the drilling step of the drilling hole precedes the pipe setting step, the drilling step for drilling the pipe using the drill rod and the drill bit is performed in advance. Engage the joint provided on the pipe built with the drill and the joint provided on the drill rod, the drill rod drills while being guided by the pipe joint, and It is preferable to drill a drilling hole for pipe installation so as to be connected and built.

In the case where the excavation of the drilling hole for pipe installation and the installation of the pipe are performed simultaneously, the step of excavating the drilling hole for pipe installation and the installation of the pipe at the same time are performed first. Engage the joint provided on the pipe that was erected and the joint provided on the pipe that is excavating late, the later pipe excavated while being guided by the joint of the preceding pipe, It is preferable that the pipe is built so as to be built in connection with the pipe built earlier.

In the case where the drilling step of the drilling hole precedes the step of laying the pipe, in the step of drilling the drilling hole for pipe building using a drill rod and a drill bit, a guide pipe is attached to the drill rod. And the large diameter ring of the guide tube was passed through the pipe that was previously built, and the drill rod was guided by the pipe that was previously built to perform drilling, and thus was built earlier It is preferable to drill a drilling hole for pipe installation so as to be built in connection with the pipe.

In the case where the excavation of the pipe hole and the pipe are simultaneously performed, the excavation of the pipe hole and the pipe are simultaneously performed. Attach the guide pipe to the pipe to be erected and pass the large diameter ring of the guide pipe through the previously erected pipe, and the later pipe will be excavated and erected while being guided by the previously erected pipe. It is preferable that the pipe is built so as to be connected to the pipe previously built.

Further, in practicing the present invention, the pipes can be built with an interval between them.

Here, in the present invention, when drilling a drill hole using a drill rod and a drill bit or by positioning the drill rod inside a pipe, the drilling position is measured by a measuring instrument, and the drilling direction is measured. Or, while correcting the drilling trajectory,
Drilling (or drilling) the ground by operating a drill rod or pipe using a horizontal hole drilling machine.

According to the present invention having such a configuration, when drilling a drill hole, the drill rod and the drill bit are advanced along the scheduled line of the pipe roof while correcting the drilling trajectory. If the excavation trajectory deviates from the desired trajectory, the trajectory can be corrected immediately. Similarly, when a long drill rod is inserted into a long pipe and excavation of the ground and embedding of a long pipe are performed simultaneously with the drill bit protruding from the end of the pipe, the drilling is performed. Since the drill rod and the long pipe are advanced along the planned line of the pipe roof while correcting the trajectory, even if the drilling trajectory deviates from the desired trajectory, the trajectory can be corrected immediately.

That is, according to the present invention, a long drill or a pipe can be built with high accuracy along a planned drilling line using a long drill rod or a long pipe. As a result, a long drill rod or a long pipe can be used, so that it is not necessary to provide a widened portion, and it is not necessary to perform the work separately for each short section.

Further, since a plurality of long pipes are embedded,
Excessive excavation such as the fore piling method does not occur.

Further, by using a joint between the joints or using a guide tube, the pipe previously built can be
Since it can be used as a drill rod for drilling an adjacent drilling hole or as a guide member for a pipe to be erected later, a plurality of pipes can be quickly built in a predetermined linear shape.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of the present invention will be described. Here, in the drawings, the same members are denoted by the same reference numerals.

FIGS. 1 to 5 show an outline of a cross section of a tunnel forming a support by a tunnel excavation and its auxiliary method, more specifically, a pipe roof method according to the present invention. In FIG. 1, reference symbol G denotes a ground on which a tunnel is to be excavated, reference numeral PT denotes an area corresponding to a cross section of the tunnel to be excavated, and a two-dot chain line TV denotes a region of the tunnel to be excavated. The plan line is shown, and reference numeral 1
0 indicates a horizontal hole excavator.

The horizontal hole drilling machine 10 has a function of rotating, pushing, and retracting the drill rod 12 and controlling the direction by using a bit (not shown) at the tip of the drill rod 12 to schedule the pipe roof of the tunnel. Line T
Excavate the ground G directly above -V. More specifically, the position just above and around the region PT corresponding to the tunnel cross section is excavated along the scheduled line TV of the pipe roof. In FIG. 1, a drill hole (indicated by a dotted line in FIG. 1) that is drilled using the drill rod 12 is indicated by a reference symbol H.

Next, as shown in FIG.
Drilled hole H excavated while controlling the direction using (FIG. 1)
Then, a steel pipe (or pipe) 14 for a pipe roof is erected by the horizontal hole excavator 10. Here, the horizontal hole drilling machine 10 has a function of rotating, pushing and pulling not only the drill rod 12 but also the pipe 14.

Although not explicitly shown, the drilling may be performed by the pipe 14 itself instead of setting the pipe 14 in the drill hole H drilled by using the drill rod 12. Also in this case, the ground G is excavated along the scheduled line TV of the pipe roof by rotating, pushing and pulling the long pipe 14 having the excavation bit at the tip by the horizontal hole excavator 10. You do it.

In FIG. 3, a pipe 14 is erected by drilling using a drill rod 12, or a hole is drilled by the pipe 14 itself, and then mortar is injected into and out of the pipe 14 by a mortar injection mechanism (not shown). Note that FIG.
Reference numeral 14M in the inside indicates a pipe into which mortar is injected inside and outside.

After a predetermined number of pipes 14M into which mortar is injected inside and outside are formed in this way, as shown in FIGS. 4 and 5, a tunnel T is excavated along a predetermined line TV of the pipe roof. . Here, a support can be formed on the ceiling portion of the tunnel T by the pipe 14 and the injected mortar.

Here, when arranging the pipe 14, FIG.
However, the present invention is not limited to the arrangement in an arc shape as shown in FIG. As shown in FIG. 6, in the pipe roof method,
The pipes 14 can be arranged so as to avoid the planned shape of the tunnel cross section or the underground structure SG.
According to the present invention, when performing the pipe roof method, a plurality of pipes can be built at regular intervals, or as shown in FIG. More specifically, as shown in FIG. 25, there are three types of separation or contact between a plurality of adjacent pipes.
That is, as shown in FIG. 25A, both the adjacent pipes 14, 14 and the surrounding grout filling portions 50, 50 are separated from each other, and as shown in FIG.
The pipes 14, 14 are separated but the grout filling part 5
0 and 50 are in contact with each other, and as shown in FIG. 25C, pipes 14 are in contact with each other (naturally, grout filling portions 50 and 50 are also in contact with each other). There is. Then, the state in which the pipes are erected without gaps corresponds to both the state in FIG. 25 (B) and the state in FIG. 25 (C). In the state shown in FIG. 25 (b), the pipes are integrated via the grout, and there is no problem in the effect of preventing the sediment around the pipe from collapsing and the effect of stopping water.

FIGS. 7-16 show various embodiments for drilling with a drill rod (see FIG. 1) and for erection of a pipe 14. FIG. FIG.
1 shows the most basic embodiment in the excavation process using the step S1 and the step of erection of the pipes 14 at regular intervals.

In FIG. 7, first, as shown in FIG. 7A, a measuring device 20 and a drill bit 22 are provided at the tip of a drill rod 12 (see FIG. 1; not shown in FIG. 7). . Here, the measuring device 20 detects which part of the ground G is excavated by the bit 22. The vent sub 21 is a device for controlling the excavation along the planning line TV. The bit 22 is appropriately selected depending on the soil properties of the ground G and the like. The tip of the drill rod 12, the measuring device 20, and the bit 22 are collectively referred to as “drilling knitting”, and the whole is denoted by reference numeral 30.

In FIG. 7A, an arrow D indicates the direction of excavation and traveling by excavation knitting.

When the excavation of the predetermined excavation hole H is completed,
As shown in FIG. 7B, the excavated formation is pulled out from the excavated hole H and collected. In FIG. 7B, the arrow P indicates the direction in which the excavated knitting 30 is pulled out.

Then, as shown in FIG. 7C, the pipe 14 for the pipe roof is inserted into the drilled hole H. Here, the pipe 14 has such flexibility as to be able to follow the curvature or the like of the drill hole H, and the horizontal hole drilling machine 10 shown in FIG.
(Not shown in FIG. 7). The arrow D14 in FIG. 7C indicates the direction in which the pipe 14 is inserted or erected.

When the pipe 14 is installed in the excavation hole H, as shown in FIG. 7 (d), MS such as cement milk or mortar is filled into the pipe 14 (injection into the inside).
Then, the inside of the pipe 14 is filled (back injection). This forms a pipe into which mortar is injected inside and outside, as indicated by reference numeral 14M in FIG.

FIG. 8 also shows another embodiment of the excavation process using the drill rod 12 and the step of erection of the pipes 14 at regular intervals. First, as shown in FIG. 8 (a), a drill rod 1 having a drill bit 22s at the tip is provided.
2 is inserted inside the long pipe 14 and the drill bit 22 is inserted.
It is configured such that only s protrudes from the tip of the pipe 14. Then, using the horizontal hole excavator 10 (not shown in FIG. 8), the excavation by the excavation knitting and the installation of the pipe 14 are simultaneously performed. Here, the outer diameter of the bit 22s is configured to be variable and is larger than the outer diameter of the pipe 14 during excavation.
This is a bit of a type smaller than the inner diameter of No. 4.

When the excavation of the predetermined excavation hole H is completed,
The diameter until the outer diameter of the bit 22s becomes smaller than the inner diameter of the pipe 14 is reduced, and as shown in FIG.
To drilling formation 30 (the tip of drill rod 12, measuring device 2
0, vent sub 21, and bit 22s) are withdrawn and collected. However, as shown in FIG. 8B, the pipe 14 remains as it is.

Then, as shown in FIG. 8 (c), MS such as cement milk or mortar, a chemical solution, or self-hardening mud is filled inside the pipe 14 (filling injection), and filled outside the pipe 14 (back filling filling). ). Accordingly, in FIG.
As shown by 4M, a pipe is formed into which mortar is injected inside and outside.

FIG. 9 shows still another embodiment of the drilling process using the drill rod 12 and the step of erection of the pipes 14 at regular intervals. In FIG. 9A, similarly to the process shown in FIG. 8A in the embodiment of FIG. 8, the drill rod 12 provided with the drill bit 22A at the tip is inserted into the inside of the long pipe 14, Only the drill bit 22A is configured to protrude from the tip of the pipe 14, so that the horizontal drilling machine 10 (not shown in FIG. 9) is used to simultaneously perform the drilling by the drilling knitting and the embedding of the pipe 14. Do.

Although not clearly shown, the excavating bit 22A used in the embodiment of FIG. 9 is not of a type having a reduced outer diameter. This bit 22A has a predetermined hole H
Is excavated, the rod 12 or the measuring device 20
(Not shown in FIG. 9: see FIG. 7). As for the structure for separating the excavation bit 22A, an existing separable excavation bit may be applied as it is.

When the excavation of the predetermined excavation hole H is completed,
As shown in FIG. 9B, the bit 22A is cut off from the rod 12 or the measuring device 20 (not shown in FIG. 9; see FIG. 7), and the pipe 14 remains as it is, except for the bit 22A from the excavation hole H. The excavation organization 30 is pulled out and collected. In other words, the embodiment of FIG. 9 is different from the embodiment of FIG. 8 in that the bit 22A is filled in.

Then, as shown in FIG. 9 (c), MS such as cement milk or mortar, a chemical solution, or self-hardening mud is filled inside the pipe 14 (filling and filling), and filled outside the pipe 14 (filling and filling). 3) to form a pipe into which mortar is injected inside and outside, as indicated by reference numeral 14M in FIG.

FIGS. 7 to 9 show an embodiment in the excavation step using the drill rod 12 and the step of erection of the pipes 14 at regular intervals.

FIGS. 10 to 16 show an embodiment in which adjacent pipes are erected in a state where gaps between the pipes erected in the previous process are eliminated.

In the embodiment of FIG. 10, first, in step (a), the excavation hole H is formed in the ground G by the excavation formation 30 at the tip of the rod 12 using the horizontal hole excavator 10 (not shown in FIG. 10). Excavate. When a predetermined drilling hole H is drilled, the drill rod 12 and the drilling knitting 30 are pulled out in the direction of the arrow P as shown in FIG. Then, in the step (c), the pipe 14A is erected.

Here, step (a) shown in FIG.
(B) and (c) are substantially the same as steps (a), (b) and (c) in the embodiment of FIG. However, the difference is that a pipe 14A used in the embodiment shown in FIG. 10 is provided with a joint 14J.

Next, as shown in FIG. 10D, the excavation hole H2 continuous with the excavation hole H is formed by the rod 12A having the joint 12J that engages with the joint 14J of the pipe 14A and the excavation knitting at the tip. Excavate. At this time, as shown in FIGS. 10D and 10E, excavation is performed in the direction of arrow D in a state where the joint 12J of the rod 12A is engaged with the joint 14J of the pipe 14A. And joint 14J
And the joint 12J acts as a guide member, and the rod 1
2A and excavation at the tip (bit 22, measuring device 20)
Is guided to excavate the excavation hole H2 in a state continuous with the excavation hole H (a state without a gap: a state shown in (b) and (c) of FIG. 25).

When a predetermined drilling hole H2 is drilled while being guided by the joint 14J of the pipe 14A, the rod 12
Pull out A and the excavation organization at the tip. Then, as shown in FIG. 10F, the pipe 14A is erected in the excavation hole H2. As is clear from FIG. 10F, the joint 14J of the newly erected pipe 14A is engaged with the joint 14J of the already erected pipe. In other words,
The engagement of the joints 14J of the adjacent pipes 14A guides the newly erected pipes, and the erected pipes 14A are continuous or have no gap ((b) in FIG. 25, (B) (C).

When a predetermined number of pipes 14A are laid without any gaps between adjacent pipes 14A (states shown in (b) and (c) of FIG. 25), as shown in (g) of FIG. For simplicity of illustration, only two pipes are shown erected), MS such as cement milk or mortar
Is filled into the inside of the pipe 14 (injection into the inside), and the pipe 14
Is filled (back injection).

FIG. 11 exemplifies the shape of a joint 14J provided on the pipe 14A.
The male / female joint indicated by -1 is called a two-port type, the joint indicated by (b) is called a WL (A) type, the joint indicated by (c) is called a WL (B) type, The joint shown in d) is called the CH type. Furthermore, it is also possible to use a joint as shown in FIG. The joint shown in FIG. 11E is a combination of a male joint and a female joint, and has an effect of preventing a twist or a rolling phenomenon at the joint.

In the embodiment shown in FIG. 12, first, as shown in FIG. 12A, a drill rod 1 provided with a drill bit 22s at the tip is provided.
2 is disposed inside the long pipe 14A provided with the joint 14J, and only the drill bit 22s is attached to the pipe 14A.
It protrudes from the tip. And the horizontal hole excavator 10
(Not shown in FIG. 12) using a drilling knitting (drill rod 12 tip, measuring device, bit 22s),
The installation of the pipe 14A is performed at the same time. Bit 22s
Is a type whose outer diameter changes, and is larger than the outer diameter of the pipe 14 at the time of excavation, but smaller than the inner diameter of the pipe 14 at the time of collecting the excavated knitting.

When the excavation of the predetermined excavation hole H is completed,
The outer diameter of the bit 22s is reduced until the outer diameter of the bit 22s becomes smaller than the inner diameter of the pipe 14, and as shown in FIG.
And the bit 22 is pulled out and collected. Here, FIG.
Steps (a) and (b) indicated by
Except for the point that J is provided, it is substantially the same as the steps (a) and (b) in the embodiment of FIG.

Next, as shown in FIG. 12C, the erected pipe 14A (reference numeral 14A-1 in FIG. 12C).
At the position adjacent to the bit 22s, the rod 12, and the pipe 14A having a configuration as shown in FIG.
-2, the excavation of the excavation hole H2 and the pipe 14A-
And 2 are simultaneously built. Here, when excavation and erection are performed simultaneously, the pipe 14 previously erected
A-1 joint 14J and newly built pipe 1
Excavation is performed in the direction of arrow D with the joint 14J of 4A-2 engaged. That is, the preceding pipe 14A-
The first pipe 14A acts as a guide member so that the excavation hole H2 is excavated continuously with the excavation hole H previously excavated or with no gap.
-2.

When a predetermined excavation hole H2 is excavated while being guided by the joint 14J of the preceding pipe 14A-1, the rod 12A and the excavation knit at the tip are pulled out as shown in FIG. 12 (b). Here, the pipe 14A-1 and the pipe 1
4A-2, the fitted pipe 14A is in a continuous state due to the engagement between the joints 14J.

If adjacent pipes 14A of a predetermined number (only two pipes are shown in FIG. 12 for simplicity of illustration) are erected without gaps (states shown in (b) and (c) in FIG. 25). For example, as shown in FIG. 12 (d), MS such as cement milk or mortar is filled inside the pipe 14 (filling injection) and filled outside the pipe 14 (back filling injection).

In the embodiment shown in FIG. 13, the drill bit 22A to be used is not of the type whose outer diameter is reduced. The bit 22A has a configuration that can be easily separated from the rod 12 or the measuring device 20 (not shown in FIG. 13: see FIG. 7) when a predetermined drilling hole H is drilled.
The rest is substantially the same as the embodiment of FIG.

In the embodiment of FIG. 14, first, in step (a), the excavation hole H is formed in the ground G by the excavation formation 30 at the tip of the rod 12 using the horizontal hole excavator 10 (not shown in FIG. 14). Excavate. When the predetermined drilling hole H has been drilled, the drill rod 12 and the drilling knitting 30 are pulled out in the direction of arrow P as shown in FIG.

Then, in the step (c), the pipe 14B
Build in. Here, (c) and (d) of FIG.
As shown by, a guide tube 34 is attached to the pipe 14B, and the other side of the guide tube 34 is
It is attached to the rod 12 having the excavation formation 30. That is, the rod 12 having the excavation formation 30 and the pipe 14 </ b> B are connected via the guide pipe 34.
Therefore, at the same time when the pipe 14B is erected in the excavation hole H, the excavation hole H2 continuous with the excavation hole H is excavated.

When the pipe 14B is set in the excavation hole H, the rod 12 and the guide tube 34 are recovered (FIG. 14).
(E).

Then, as shown in FIG. 14F, a new pipe 14B-2 is erected in the excavation hole H2. This pipe 14B-2 is also connected to the rod 12 via the guide pipe 34. I have. Therefore, at the same time when the pipe 14B-2 is erected, a new excavation hole H3 that is continuous with the excavation hole H2 is excavated by the excavation formation 30 at the rod tip.

When the predetermined number of pipes 14B have been set up in this manner (only three pipes are shown in FIG. 14 (g) for simplicity of illustration), MS such as cement milk or mortar is transferred to the pipe 14B. Is filled (injection into the inside) and filled (outside injection) outside the pipe 14B.

In the embodiment shown in FIG. 15, first, as shown in FIG. 15A, a drill rod 1 having a drill bit 22s at its tip is provided.
2 are arranged inside the long pipe 14B-1, and only the drill bit 22s protrudes from the tip of the pipe 14B-1. Then, the horizontal hole excavator 10 (FIG. 15)
(Not shown)), and excavation by the excavation formation and erection of the pipe 14B-1 are simultaneously performed. Bit 22s
Is a type whose outer diameter changes, which is larger than the outer diameter of the pipe 14B-1 at the time of excavation, but is smaller than the inner diameter of the pipe 14B-1 at the time of excavation and knitting recovery.

When the excavation of the predetermined excavation hole H is completed,
The outer diameter of the bit 22s is reduced until it becomes smaller than the inner diameter of the pipe 14B-1, and as shown in FIG.
With the pipe 14B-1 remaining, the drill rod 12 and the bit 22s are pulled out from the drill hole H and collected.

Next, as shown in FIGS. 15C and 15D, one ring R-1 of the guide tube 34A is passed through the pipe 14B-1 that has been erected, and the other ring R-2. Is attached to the pipe 14B-2 to be built later.
This pipe 14B-2, like the pipe 14B-1,
In combination with the bit 22s and the like, excavation of the excavation hole H2,
The pipe 14 </ b> B- 2 is configured to be installed at the same time. However, in the pipe 14B-2, the pipe 14B-1 previously built by the guide pipe 34A.
Therefore, the excavation hole H and the excavation hole H2 are continuous, and the pipes 14B-1 and 14B-2 do not leave a gap (a state shown in (b) and (c) of FIG. 25). It is built.

If the adjacent pipes 14B are erected without gaps (states shown in FIGS. 25 (b) and (c)), as shown in FIG. 12 (d) (for simplification of the drawing) ,
Only two pipes are shown), MS such as cement milk or mortar is filled inside the pipe 14 (filling injection), and filled outside the pipe 14 (back filling injection).

In the embodiment shown in FIG. 16, the digging bit 22A used is not of the type whose outer diameter is reduced. The bit 22A is configured to be easily separated from the rod 12 or the measuring device 20 (not shown in FIG. 16: see FIG. 7) when a predetermined drilling hole H is drilled.
Others are substantially the same as the embodiment of FIG.

The operation of the above-described embodiment of the present invention will be described with reference to FIGS. According to the present invention described above, the drill rod 12
If an error occurs in the direction of the excavation or drilling by the excavation bit 22 (22s, 22A) during excavation by the drilling or installation of the pipe 14 (14A, 14B), the direction can be corrected. Excavation and pipe embedding can be performed with high accuracy along the scheduled line TV of the pipe roof. Although not explicitly shown,
In FIG. 17, a portion indicated by reference numeral 50 is a portion where the trajectory was corrected at the time of excavation or pipe installation. At this point, as shown in FIG. 20, the accuracy of the excavation direction cannot be increased, and when a long excavation or a pipe is built,
The position of the drill hole and the pipe position is the scheduled line T of the pipe roof.
The present invention is superior to the prior art which is separated from -V.

In the prior art, in order to prevent the position of the excavation hole and the position of the pipe from being separated from the scheduled line TV of the pipe roof, a widened portion W is provided as shown in FIG. It must be constructed for each short section. On the other hand, according to the illustrated embodiment, it is possible to perform the excavation with the long drill rod 22 and the installation of the long pipe without providing the widened portion W.

Further, according to the above-described embodiment, since the drilling with the long drill rod 22 and the erection of the long pipe are performed, the case where the curved boring is performed in the area indicated by reference numeral BB in FIG. In this case, the direction may be continuously corrected in the area. On the other hand, in the prior art, excavation or pipe laying in a curved portion is hardly practical.

In addition to this, as shown in FIG. 19, according to the present invention, preloading by a pipe is performed over a long distance (long) range. Therefore, unlike the conventional fore-piling method shown in FIG. 23, no excessive excavation portion of the tunnel is generated.

The embodiments shown in FIGS. 6 and 10 and subsequent figures mainly show a case where the pipes 14 are connected to each other so as to eliminate the gap therebetween, but the embodiments shown in FIGS. As shown in the drawing, it is of course possible to perform the construction with an interval between the pipes 14. FIG. 24 shows a front view of the case where the present invention is applied to the pipe roof construction method in tunnel excavation work, and a region indicated by a symbol T in FIG. 24 is a tunnel cross section.

The illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention. In other words, the present invention provides modifications and the like of the illustrated embodiment,
It is within the technical scope. For example, in the illustrated embodiment, the pipe laying step precedes the injected material injecting step, but the pipe can be erected after injecting and filling the injected material into the pipe digging hole. Alternatively, it is also possible to drill a drilling hole for pipe installation while filling with muddy water mixed with an injection material, and to simultaneously perform the drilling step and the injection material injection step.

[0077]

The effects of the present invention are listed below. (1) Excavation or pipe laying can be performed with high accuracy over a long distance along the planned line of the pipe roof. (2) There is no need to provide the widened portion W, and there is no need to perform the work separately for each short section. Therefore, the entire construction period of the tunnel excavation and the tunnel excavation auxiliary construction method can be shortened. (3) The surplus digging part is reduced. (4) Excavation and pipe installation can be performed efficiently. (5) A plurality of pipes can be erected without forming a gap between adjacent pipes or without forming a gap in a grout material filling region. (6) Construction can be performed along the planned line of the curved pipe roof.

[Brief description of the drawings]

FIG. 1 is a diagram showing an excavation step in one embodiment of the present invention.

FIG. 2 is a view showing a main part of a pipe laying process in the embodiment of FIG. 1;

FIG. 3 is a diagram showing a state in which pipe laying has been completed in the embodiment of FIG. 1;

FIG. 4 is a view showing a step of excavating a tunnel in the embodiment of FIG. 1;

FIG. 5 is an enlarged view showing the vicinity of the tunnel entrance of FIG. 4;

FIG. 6 is a view showing a state in which a plurality of pipe roofs are connected and erected in a curved shape.

FIG. 7 is a view showing one embodiment of pipe roof installation.

FIG. 8 is a view showing an embodiment different from FIG. 7 in which a pipe roof is built.

FIG. 9 is a view showing an embodiment different from FIGS. 7 and 8 in which a pipe roof is built.

FIG. 10 is a view showing an embodiment different from FIGS. 7 to 9 in which a pipe roof is built.

FIG. 11 is a view showing an example of a joint.

FIG. 12 is a view showing an embodiment different from FIGS. 7 to 11 in which a pipe roof is built.

FIG. 13 is a view showing an embodiment different from FIGS. 7 to 12 in which a pipe roof is built.

FIG. 14 is a view showing an embodiment different from FIGS. 7 to 13 in which a pipe roof is built.

FIG. 15 is a view showing an embodiment different from FIGS.

FIG. 16 is a view showing an embodiment different from FIGS. 7 to 15 in which a pipe roof is built.

FIG. 17 is a diagram for explaining the operation and effect of the embodiment of the present invention.

FIG. 18 is a diagram different from FIG. 17 for explaining the operation and effect of the embodiment of the present invention.

FIG. 19 is a diagram for explaining the operation and effect of the embodiment of the present invention, which is different from FIGS. 17 and 18;

FIG. 20 is a view for explaining a problem of the conventional pipe roof construction method.

FIG. 21 is a view for explaining another problem of the conventional pipe roof method.

FIG. 22 is a view for explaining still another problem of the conventional pipe roof method.

FIG. 23 is a view for explaining another problem of the conventional pipe roof method.

FIG. 24 is a front sectional view showing an embodiment in which pipes are arranged at intervals.

FIG. 25 is a sectional view schematically showing a positional relationship between adjacent pipes.

[Explanation of symbols]

G: The ground where the tunnel is to be excavated PT: An area corresponding to the cross section of the tunnel to be excavated TV: Planned excavation line of the tunnel 10: Horizontal hole excavator 12: Drill Rod H, H2, H3 ... Drilling hole 14, 14A, 14B, 14M ... Pipe 12J ... Joint provided on drill rod 14J ... Joint provided on pipe 20 ... Measurement device 21 ...・ Vent sub 22,22s, 22A ・ ・ ・ Drilling bit 30 ・ ・ ・ Drilling organization MS ・ ・ ・ Cement milk or mortar etc. 34,34A ・ ・ ・ Guide pipe W ・ ・ ・ Wide enlarged part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shohei Kato 3-20-16 Nishiazabu, Minato-ku, Tokyo Inside the Japan Ocean Drilling Co., Ltd. (72) Inventor Hiroyuki Sekino 3-chome Nishiazabu, Minato-ku, Tokyo No. 20-16 Japan Sea Ocean Drilling Co., Ltd. F-term (reference) 2D054 AC15

Claims (11)

[Claims] 1. A step of drilling a drill hole for building a pipe using a drill rod and a drill bit, a step of building a pipe in a borehole drilled by the step, and building a predetermined number of pipes And then injecting an injection material into and out of the pipe, wherein in the step of excavating the excavation hole, the drill rod and the drill bit are advanced along the planned line of the pipe roof while correcting the excavation trajectory. Characterized pipe roof construction method. 2. A drill rod having a drill bit at a tip is inserted into a pipe, the ground is drilled with the drill bit protruding from the tip of the pipe, and drilling of a drill hole for building a pipe and building of a pipe are performed. Including the step of simultaneously performing the digging, the step of collecting the drill rod and the digging bit, and the step of pouring the injection material into and out of the pipes after laying a predetermined number of pipes. A pipe roof method wherein a drill rod and a pipe are advanced along a predetermined line of the pipe roof while correcting a drilling trajectory. 3. A drill rod having a drill bit at a tip is inserted into a pipe, the ground is drilled with the drill bit protruding from the tip of the pipe, and a drill hole for building a pipe and drilling of a pipe are performed. And a step of separating a drill bit from a drill rod to collect a drilling knit other than the drill bit, and a step of injecting an injection material into and out of the pipe after a predetermined number of pipes have been built. A pipe roof construction method wherein a drill rod and a pipe are advanced along a predetermined line of a pipe roof while correcting a drilling trajectory in a step of excavating and erection. 4. A step of using a drill rod and a drill bit to drill a drill hole for erection of a pipe, a step of injecting an injection material into the drill hole drilled by the step, and filling the injection material. Erecting a pipe in the borehole, wherein the step of drilling the borehole advances a drill rod and a drill bit along a predetermined line of the pipe roof while correcting a drilling trajectory. Pipe roof method. 5. A step of using a drill rod and a drill bit and filling a muddy water mixed with an injection material to drill a drilling hole for pipe installation, and building a pipe in the drilling hole drilled by the step. A step of drilling the drilling hole, wherein a drill rod and a drill bit are advanced along a predetermined line of the pipe roof while correcting a drilling trajectory. 6. A drill rod having a drill bit at its tip is inserted into a pipe, and the ground is drilled with the drill bit protruding from the tip of the pipe and filled with muddy water mixed with an injecting material. Including the steps of simultaneously injecting material, drilling a drill hole for pipe building, and building a pipe, and collecting a drill rod and a drill bit, the step of performing injection, drilling, and building involves a drilling trajectory. A pipe roof construction method wherein a drill rod and a pipe are advanced along a predetermined line of a pipe roof while correcting the above. 7. A drill rod having a drill bit at its tip is inserted into a pipe, and the ground is drilled with the drill bit protruding from the tip of the pipe and filled with muddy water mixed with an injection material. Injection and excavation including a step of simultaneously injecting material, excavating a drill hole for pipe installation, and embedding a pipe, and a step of separating a drill bit from a drill rod and collecting a drilling organization other than the drill bit. The pipe roof method is characterized in that a drill rod and a pipe are advanced along a predetermined line of the pipe roof while correcting a drilling trajectory in a step of performing the erection. 8. A step of digging a drill hole for laying a pipe using a drill rod and a drill bit, wherein a joint provided on a pipe previously laid and a joint provided on the drill rod are engaged. The drill rod performs drilling while being guided by a pipe joint, thereby drilling a drilling hole for pipe installation so as to be installed in connection with a previously built pipe. 4. The pipe roof method according to any one of items 4 and 5. 9. A step of simultaneously excavating a drilling hole for pipe embedding and embedding a pipe, wherein the joint is provided on a pipe which has been previously built and a pipe which is subsequently excavated. The new pipe is excavated while being guided by the joint of the preceding pipe. Any one of claims 2, 3, 6, and 7,
Item pipe roof method. 10. A step of drilling a drilling hole for pipe erection using a drill rod and a drill bit, by attaching a guide pipe to the drill rod and passing a large-diameter ring of the guide pipe through the pipe previously erected. Wherein the drill rod is guided by a pipe to be erected first and performs digging, thereby digging a digging hole for pipe erection so as to be erected in connection with the pipe to be erected earlier. 1,
4. The pipe roof method according to any one of items 4 and 5. 11. A step of simultaneously excavating an excavation hole for erection of a pipe and erection of a pipe, wherein a guide pipe is attached to a pipe to be erected later and a guide pipe is attached to a pipe erected earlier. Through the large-diameter ring, the subsequent pipe is excavated and erected while being guided by the previously erected pipe, so that it is erected in conjunction with the earlier erected pipe. The pipe roof method according to any one of 2, 3, 6, and 7.