JP2926279B2 - Tunnel excavation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavation method for excavating a tunnel while forming a slit along a tunnel excavation line by a slit forming apparatus.

[0002]

2. Description of the Related Art Conventionally, in a tunnel excavation method for excavating a tunnel in a bedrock, a method in which a bedrock is drilled in advance and an explosive is charged in the hole, and the bedrock is destroyed by using the explosive force of the explosive is generally adopted. ing. However, this method involves the danger of the operation due to the use of explosives, and has a problem that it is restricted in the area where it can be constructed due to noise and vibration. In recent years, various tunnel excavation methods using machines such as rock drills have been proposed in order to improve the above-mentioned problems.

[0003]

However, the conventional tunnel excavation method using a machine employs a method in which a large number of holes are formed in the rock and the rock is divided, so that it takes much time to excavate. And the amount of drilling per day is small,
There is a problem with poor work efficiency.

[0004] Further, since the finish around the tunnel excavation line is poor, it is necessary to perform a finishing operation along the tunnel excavation line using an excavator such as a rod header after excavation, and this finishing operation also requires much time. At the same time, there was a problem that the expenditure of the drilling tool was fast and the cost increased. SUMMARY OF THE INVENTION The present invention has been made for the purpose of improving the above-mentioned conventional problems, and an object of the present invention is to provide a tunnel excavation method in which a tunnel wall surface can be finished smoothly.

[0005]

According to the present invention, in order to achieve the above object, a slit is formed along a tunnel excavation line of a bedrock where a tunnel is to be excavated, and then a number of split rock holes are formed inside the slit. Then, the space is formed by splitting the core near the both ends of the tunnel excavation line and cutting the core, then starting the split rock toward the space from the split rock hole near the space, performing the split rock on the entire tunnel excavation line, A slightly larger number of split rock holes were drilled near both ends of the excavator to facilitate splitting and core cutting of this portion.

When the tunnel is excavated by the above method, the inner wall of the tunnel is finished smoothly, so that the finishing work of the inner wall of the tunnel after the excavation becomes unnecessary.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the method of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 denotes a slit forming apparatus during tunnel excavation, which is provided with a swingable plate on a guide cell 3 provided on an upper part of a mast 2 and side drills (both not shown) on both sides thereof. A line bit for forming a slit in the rock is provided at a tip of the plate, and a drill bit (neither is shown) is provided at a tip of the side drill. When a tunnel is excavated in a bedrock, a slit 5 is formed along a tunnel excavation line 4 using the slit forming apparatus 1 as shown in FIG.

In forming the slit 5, first, a line bit and a drill bit are positioned on the tunnel drilling line 4, and the plate is swung while drilling holes 6 at regular intervals by the drill bit. A slit 5 is formed between each hole 6 by a line bit attached to the tip. When the depth of the slit 5 reaches a preset depth, the line bit and the drill bit are moved, and the hole 6 and the slit 5 are drilled again following the hole 6 and the slit 5 already drilled.

[0008] The above operation is repeated to form a slit 5 along the arcuate tunnel planning line 4 first. After the arcuate slit 5 has been formed, the slit 5 is connected to the lower end of the arcuate tunnel excavation line 4 and is horizontally extended. One or a plurality of slits 7 are formed using the slit forming apparatus 1. Note that the arc-shaped slit 5 may be formed after the horizontal slit 7 is formed.

After the slits 5 and 7 have been formed along the tunnel excavation line 4 as described above, a rock drilling machine 9 is then inserted into the tunnel as shown in FIG. A number of split rock holes 10 are drilled. In the vicinity 11 of both ends, which is a connection portion between the arc-shaped slit 5 and the horizontal slit 7, a cut rock hole 10 is formed slightly larger than other portions.

When the slits 5, 7 and the rock hole 10 have been drilled as described above, the rock rocker 13 is put into the tunnel as shown in FIG. To rock. In the vicinity 11 of both ends, the fractured rock hole 10 is drilled slightly more than the other parts, and because it is close to the slits 5 and 7, the fractured rock can be formed relatively easily. In addition, as a method of split rock, a wedge is inserted into the split rock hole 10, and
Or using a breaker in combination, and a plurality of split rock drills 13 may be used in combination to increase excavation efficiency.

When the rocks near both ends are completed as described above, next, as shown in FIG.
A wedge is inserted into the nearby rock hole 10 and the rock is repeated toward the space 14 formed by the rock, thereby removing all the rock inside the slits 5 and 7 by cutting. By using the hydraulic breaker 15 as shown in FIG. 7, the efficiency can be further improved.

When the split rocks of the depths of the slits 5 and 6 formed in advance as described above are completed, the split rock is removed, and the slit forming apparatus 1 is put into the tunnel again, and the slits shown in FIGS. The operation is repeated, and slits 5 and 7 are formed in advance along the tunnel excavation line 4, so that the inner wall of the tunnel is finished smoothly, and the finishing work after the split rock is unnecessary, and the ground in the split rock is loosened. Can also be prevented.

[0013]

As described above in detail, according to the present invention, a slit is formed in advance along a tunnel excavation line, and then a split rock hole is formed in the tunnel excavation line, and split rock is started near both ends of the tunnel excavation line. As a result, since the entire inside of the tunnel excavation line is split, the inner wall of the excavated tunnel is finished smoothly and does not require finishing work after excavation. And near the both ends, there are slightly more rock holes than the other parts, and because it is close to the slit, it is relatively easy to cut rock and core. As a result, tunnel excavation can be carried out efficiently, and there is little loosening of the ground during excavation, so there is no need to cover the inner wall with concrete. Can be reduced and it is economical.

In addition, since cores are cut out near both ends of the tunnel excavation line and the rock is split, the wiping around the corners is finished cleanly, and it is not necessary to separately drill a cored hole.
It is also possible to omit the trouble of forming the coring hole.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a tunnel excavation method according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state where a slit is formed along a tunnel excavation line.

FIG. 3 is an explanatory view showing a state in which a split rock hole is formed.

FIG. 4 is an explanatory diagram of a drilled rock hole.

FIG. 5 is an explanatory view of a split rock state.

FIG. 6 is an explanatory diagram showing a space formed by the split rock.

FIG. 7 is an explanatory diagram of a state in which a rock break is performed using a hydraulic breaker.

[Explanation of symbols]

 4 Tunnel excavation line 5 Slit 7 Slit 10 Split rock hole 11 Near both ends 14 Space

Claims (1)

(57) [Claims] 1. After forming slits (5) and (7) along a tunnel excavation line (4) of a bedrock where a tunnel is to be excavated, a number of split rock holes (10 ) are formed inside the slits (5) and (7). ) were bored, When then forms a space (14) by coring and Wariiwa the vicinity of both ends tunneling line (4), the space (14) near the Wariiwa hole (1
0) to start the Wariiwa towards more space (14), performs Wariiwa overall the tunnel boring line (4), tunnel boring line (4)
Drill slightly larger rock holes (10) near both ends (11)
Tunnel excavation method that makes it easier to split rock and core .