JP2001193383A - Tunnel construction method and tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tunnel construction method and a tunnel capable of preventing collapse of a ceiling and the like over a considerable distance from a cutting face and allowing agent injection over a wide range in drilling a tunnel. SOLUTION: A jacking pipe 3 is forcibly inserted into a cutting face 102 by means of a jack 13 via a press ring 17. At the same time, a natural ground 101 is excavated by means of a semi-shield machine 5. Then, a worker injects an agent from the inside of the thrust tube 3 into the natural ground 101, and consequently, a protection roof for a planned tunnel 103 is constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel construction method and a tunnel.

[0002]

2. Description of the Related Art Generally, when a tunnel is excavated, the ground around the excavated space begins to loosen from that moment, and expands into the ground with time. In the surrounding ground, as the loosening progresses, the gap and the water content increase, causing a decrease in strength, increasing the earth pressure, increasing the temporal pressure, and further expanding in time, causing outflow of earth and sand, hollowing in the back and upper layers If the destruction progresses, it will have serious effects such as land subsidence, sinking, and landslides.

[0003] For this reason, countermeasures have been taken by auxiliary construction methods to protect the excavated surface, prevent the loosening from spreading, and stabilize the ground. As an auxiliary construction method, there is a pipe roof construction method or the like in which steel pipes are inserted and installed at a predetermined interval or continuously in a ceiling portion in front of a face to construct a protective roof made of steel pipes.

[0004]

However, in the pipe roof method, even if an attempt is made to inject a chemical, it can only be injected from the face side or from the ground, so the injection range of the chemical is limited. Further, the length of the steel pipe inserted into the ground cannot be made too long.

The present invention has been made in view of such problems, and an object thereof is to prevent a collapse of a ceiling portion or the like to a considerable distance from a face when excavating a tunnel. It is an object of the present invention to provide a tunnel construction method and a tunnel in which a chemical solution can be injected into a tunnel.

[0006]

According to a first aspect of the present invention, a plurality of propulsion pipes each having a drilling device are press-fitted from a face of a tunnel to an outer peripheral portion of a planned section of an undigged portion. And a method of constructing a tunnel characterized by preventing a ceiling portion from falling.

According to a second aspect of the present invention, there is provided a tunnel constructed by any one of the first to seventh aspects.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall view of a tunnel, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a schematic perspective view of the tunnel. As shown in FIG. 1 to FIG.
In the case of excavating the planned tunnel 103 in the area 01, when the ground 101 is soft ground such as white shirasu and the like, and there is a possibility of collapse or flooding at the face, the ground 10
Auxiliary construction method is required for the stability of 1.

In this embodiment, the planned tunnel 1
Prior to the excavation of 03, the propulsion pipe 3 is press-fitted from the transmission base 1 into the ground 101 located on the outer peripheral portion of the planned cross section of the planned tunnel 103 so that the propulsion pipes 3 are arranged in an arch shape. By injecting a chemical solution into the ground 101 from the inside of the press-fitted propulsion pipe 3, chemical solution injection ranges 45 and 47 are provided,
A protective roof for the planned tunnel 103 is constructed. This protective roof prevents loosening and collapse of the ground 101 when the planned tunnel 103 is excavated. The method for press-fitting the propulsion pipe 3 and the method for injecting the chemical solution will be described later in detail.

[0010] The transmitting base 1 is provided in the upper half 107 before the planned tunnel 103. Press-fitting of the propulsion pipe 3 and
After the injection of the chemical is completed, the planned tunnel 103 in the upper half 107
Next, the chemical solution injection range 51 is provided outside the upper half 107 to the lower half 109, and the planned tunnel 103 in the lower half 109 is excavated. Reference numeral 105 denotes an SL (spring line).

Next, a method of press-fitting the propulsion pipe 3 will be described. FIG. 4 is a sectional view of the starting base 1, and FIG.
It is B sectional drawing. As shown in FIG. 4 and FIG.
Is constructed by providing shotcrete 113 on the face 102 of the planned tunnel 103 and by providing propulsion reaction force receiving concrete 111 on the ceiling of the planned tunnel 103. A stage 23 is provided on the floor of the starting base 1 and in front of the face 102.

On the stage 23, the propulsion pipe 3 is
A movable starting base 21 for press-fitting the base 1 is provided. The movable starting frame 21 is provided with a work table 19 on which the propulsion pipe 3 is placed and on which the worker 11 can work.
Above 9, a supporting plate 15, a jack 13 for press-fitting the propulsion pipe 3, and a pressing ring 17 are provided in contact with the propulsion reaction force receiving concrete 111. The movable starting frame 21 is a stage 2
3 can be moved in a horizontal direction, and the height of the work table 19 can be adjusted by a jack 27. The jack 29 adjusts the position and height of the movable starting platform 21 according to the position and height of the propulsion pipe 3 to be press-fitted.
Plays the role of fixing 1.

The propulsion pipe 3 at the tip is provided with a semi-shield machine 5 as an excavator for the ground 101. The short propulsion pipes 3 are press-fitted into the ground 101 as one propulsion pipe 3 while being extended. The propulsion pipe 3 is positioned with respect to the face 102 by the wellhead ring 25. In addition, the propulsion pipe 3
By providing the semi-shielding machine 5 at the tip, the pipe diameter can be increased, and the worker 1
One can enter and work. A cutter 7 is provided at the tip of the semi-shield machine 5.

The position and height of the movable starting frame 21 are adjusted according to the position and height of the press-fitting propulsion tube 3, and the movable starting frame 21 is fixed by the jack 29. Through the pressing wheel 17,
With the jack 13, the propulsion pipe 3 is added and the face 10 is added.
Press into 2. At the same time, the ground 101 is excavated by the semi-shield machine 5 at the tip of the propulsion pipe 3.

After the propulsion to the destination is completed, the semi-shield machine 5 can house the cutter 7 and return the semi-shield machine 5 to the inside of the propulsion pipe 3 to collect it. The semi-shield machine 5 can be reused without the need for a pit. By repeating the press-fitting of the propulsion pipe 3, an arched protective roof with the propulsion pipe 3 is constructed in the ground 101 outside the ceiling of the planned tunnel 103.

As described above, the use of the semi-shield machine 5 allows the ground 101 to be irrespective of the anhydrous layer and the aquifer layer.
The meandering and deformation of the propulsion tube 3 are minimized, and the propulsion length is 10
It can be 0 meters or more. Further, by constructing an arched protective roof by the propulsion pipe 3, the rigidity of the propulsion pipe causes the ground 101 at the time of excavation of the planned tunnel 103 to be excavated.
Can be suppressed.

When the propulsion pipe 3 is press-fitted, high-concentration mud is used instead of water. Therefore, even if the strength of the ground 101 decreases, there is no danger that the ground 101 will flow out together with the water. The gap between the ground 101 and the ground 101 is filled with high-concentration muddy water. By performing the backfill injection 39 quickly, the looseness of the ground 101 due to excavation can be suppressed. Furthermore, since the face of the propulsion pipe 3 is pressed by the pressurized high-concentration muddy water, the face is less likely to collapse during propulsion.

Next, a method of injecting a chemical solution will be described.
FIG. 6 is a perspective view of the propulsion tube 3. The propulsion tube 3 is formed by adding a plurality of propulsion tubes 3 to one propulsion tube 3. FIG.
As shown in the figure, the propulsion pipes 3 are arranged at short intervals around the planned tunnel 103. An injection hole 31 is provided on a side surface of the propulsion pipe 3. The injection holes 31 have a predetermined pitch and are provided in a staggered arrangement so that discontinuous portions of the chemical solution injection range do not occur. The injection of the chemical solution is performed for the purpose of preventing the ground 101 from collapsing from the gap between the propulsion pipes 3 and stopping and blocking the ground 101 from water.

FIG. 7 to FIG. 10 are explanatory views of the chemical liquid injection method. As shown in FIG. 7, the backfill injection 39 is made around the propulsion pipe 3 at the time of press-fitting, and the injection hole 31 is provided with a blind cap 37. Next, as shown in FIG. 8, the primary injection of the chemical solution is performed after the propulsion pipe 3 is constructed and before the propulsion construction of the adjacent propulsion pipe 3 is performed. A valve 33 having an injection hose 41 connected to the injection hole 31 is attached. Ground 1 from injection hole 31
A chemical solution is permeated and injected into the primary chemical solution injection range 45 of No. 01. 1
The next chemical solution injection range 45 is a range that does not hinder the propulsion construction of the adjacent propulsion pipe 3. After the primary injection of the chemical solution, a blind cap 37 is attached to the injection hole 31 to prevent the injection material from deviating from the other injection hole 31.

Next, as shown in FIG. 9, after the propulsion work of the adjacent propulsion pipes 3 is completed, in order to stop water when the planned tunnel 103 excavates and to prevent the propulsion pipes 3 from collapsing from the gap.
A second injection of the drug solution is performed. Drill type drilling machine 4 for valve 33
9 is provided, and a drill hole 49 is provided up to the secondary chemical solution injection range 47 to remove slime. At this time, the injection effect of the first chemical liquid injection range 45 is confirmed by changes in the hardness, length, and the like of the slime.

Next, as shown in FIG. 10, the drill-type drilling machine 49 is removed from the valve 33, the injection hose 41 is attached to the valve 33, and the chemical liquid is injected into the secondary chemical liquid injection area 47. The chemical liquid penetrates into the secondary chemical liquid injection area 47 through the hole 49 in the gelled primary chemical liquid injection area 45. Until the planned range of the second chemical injection is reached, FIG.
And the operation of FIG. 10 are repeated. After the injection is completed, the blind cap 37 is attached to the injection hole 31. In addition, at the time of the primary injection of the chemical, similarly to the secondary injection, the chemical may be injected by drilling using a drill-type drilling machine 49. In this case, it is possible to confirm the effect of the backfill injection 39 of the propulsion pipe 3 and confirm the loosened area.

The above-described chemical solution injection process is repeated at each injection hole 31 to sequentially widen the chemical solution injection range from just before the propulsion pipe 3 to the tip end. Since the operator 11 can enter the inside of the propulsion pipe 3 in this chemical liquid injection step, the chemical liquid injection step can be performed while checking the effect of the chemical liquid injection by human power.

FIG. 11 is a diagram showing a chemical solution injection range around the propulsion pipe 3, and FIG. 12 is a diagram showing a chemical solution injection range of the entire planned tunnel 103. As shown in FIG. 11, a chemical solution can be injected into each of the propulsion tubes 3, and the gap between the propulsion tubes 3 can be filled with the primary chemical solution injection range 45. Therefore, collapse of the ground 101 from the gap between the propulsion pipes 3 can be prevented.

As shown in FIG.
As a whole, a primary chemical solution injection range 45 and a secondary chemical solution injection range 47 are formed around the arched propulsion pipe 3, and a protective roof of the planned tunnel 103 is constructed. In FIG. 12, the ground 101 outside the lower half 109 blocks groundwater coming from outside the protective roof in the upper half 107,
Before excavation of the lower half 109, the double-tube in-phase injection 51 is performed from within the upper half 107.

As described above, since the worker can move inside the propulsion pipe 3, the injection can be performed from the vicinity of the point where the chemical solution is to be injected, as compared with a normal face or injection of the chemical solution from the ground. Is significantly improved, and the injection effect can be easily confirmed. Further, even if the target location is very narrow, such as a gap between the propulsion pipes 3, the construction can be performed reliably, and re-injection can be performed at a poor injection location. further,
Since the propulsion pipe 3 is as long as about 100 m, it is possible to inject a chemical solution to a place far away from the face.

Further, injection at a low pressure is possible, and there is little influence on the structure. In addition, it becomes possible to inject a chemical solution with a short injection pipe, and it is possible to install the injection pipe with a simple machine that does not use water, such as a drill, instead of boring using water. There is no fear. In addition, you may make it freeze the circumference | surroundings of the propulsion pipe 3 instead of injection | pouring of a chemical | medical solution.

[0027]

As described in detail above, according to the present invention, when excavating a tunnel, it is possible to prevent the ceiling and the like from falling down a considerable distance from the face, and it is also possible to inject a chemical solution into a wide area. A tunnel construction method and a tunnel that can be provided can be provided.

[Brief description of the drawings]

Fig. 1 Overall view of tunnel

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic perspective view of a tunnel.

FIG. 4 is a cross-sectional view of the starting base.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a perspective view of the propulsion pipe 3.

FIG. 7 is an explanatory view of a chemical solution injection method.

FIG. 8 is an explanatory view of a chemical solution injection method.

FIG. 9 is an explanatory diagram of a chemical solution injection method.

FIG. 10 is an explanatory diagram of a chemical solution injection method.

FIG. 11 is a diagram showing a chemical solution injection range around a propulsion tube 3;

FIG. 12 is a diagram showing a chemical solution injection range of the entire planned tunnel 103;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Departure base 3 ... Propulsion pipe 5 ... Semi-shield machine 11 ... Worker 13, 27, 29 ... Jack 21 ... Movable starting frame 31 ... Injection hole 45 ... Primary chemical liquid injection range 47 ... Secondary chemical liquid injection range 101 ... Ground Mountain 103 ... Planned tunnel

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Sueo, Exit 3-12-10, Hakata-ekimae, Hakata-ku, Fukuoka, Fukuoka Prefecture F-term in Kashima Corporation Kyushu Branch (reference) 2D054 AC15 AD22 FA02 FA04

Claims (7)

[Claims] 1. A method for constructing a tunnel, comprising press-fitting a plurality of propulsion pipes provided with a drilling device from a face of the tunnel to an outer peripheral portion of a planned cross section of an unexcavated portion to prevent a ceiling from falling. . 2. The tunnel construction method according to claim 1, wherein the propulsion pipe is formed by adding a plurality of propulsion pipes. 3. The method according to claim 1, wherein a rear end of the propulsion pipe is pressed with a jack. 4. The method according to claim 1, wherein the propulsion tube has a plurality of injection holes on a side surface. 5. The tunnel construction method according to claim 1, wherein a worker can work inside the propulsion pipe. 6. The tunnel construction method according to claim 1, wherein a chemical solution is injected into the periphery of the propulsion pipe from inside the propulsion pipe. 7. The tunnel construction method according to claim 1, wherein the periphery of the propulsion pipe is frozen from inside the propulsion pipe. 8. A tunnel constructed by the tunnel construction method according to any one of claims 1 to 7.