JPH07310493A - Tunnel excavation and tunnel inwall construction - Google Patents

Abstract

PURPOSE:To safely and efficiently drill a large aperture section tunnel without a risk of falling of a working face and a canopy in a mountenous area with many complicated layers and weak grounds. CONSTITUTION:A concrete track floor 25 is laid on bottom surfaces of an advanced pilot tunnel drilled at both side positions of a tunnel and a steel structured arch frame 3 free to travel is set on the concrete track floor 25 under a tunnel drilling method to drill a large aperture section tunnel by way of dividing it into two stages. A working face is drilled in an arch shape by a drum cutter 14 mounted free to move along the arch frame 3, and a remainder in the large aperture section tunnel left not drilled is drilled by this drilling. Concrete segment for a tunnel wall surface is temporarily assembled by using a concrete segment support frame free to travel on the track floor on the laid advanced pilot tunnel bottom surfaces in an arch shape, and the concrete segment temporarily assembled in the arch shape in the previously drilled arch drilled part is carried and set at a specified position by using the segment support frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for excavating a large-diameter cross-section mountain tunnel for constructing a highway, etc. and a method for constructing an inner wall of a tunnel. The present invention relates to a method of excavating a large-diameter cross-section tunnel and a method of constructing an inner wall of a tunnel, which excavates in various strata.

[0002]

2. Description of the Related Art Generally, when excavating a tunnel in a complicated stratum or soft ground, the excavation must be carried out while preventing the collapse. For this purpose, as a conventional method, first, an arch-shaped through groove is formed by cutting, scraps generated in the through-groove are scraped out, and then the inside of the through-groove is filled with concrete to form an arch-shaped concrete. A so-called ring-cut method for forming a temporary support is known.

Further, as a method and apparatus for making these steps continuous, and also for automating and labor saving, a proposal disclosed in Japanese Patent Publication No. 61-24512 is known. In this proposal, a movable frame in which a chain cutter for cutting, a pressure air tube for discharging cutting waste, an obturator insertion tube, and a hardening agent spray tube are sequentially arranged adjacent to each other is run along an arched guide member,
It is designed to automatically and continuously perform through-groove cutting, discharge of cutting waste, insertion of an obturator, and spraying of a hardening agent.

Further, in the tunnel excavation method described in Japanese Patent Laid-Open No. 204597/1990, a screw having a cutting tool at the tip is rotated and moved forward to cut the ground, and at the same time, cutting chips are discharged to form a cylindrical shape. A hole is formed, and the screw is retracted while discharging the room temperature curable material from the tip through a passage formed in the center of the screw in the axial direction, and the room temperature curable material is filled into the hole. This is a method of forming an arch-type temporary support by rotating the cutting tool provided at the tip of the screw forward to continuously form a cylindrical hole in the ground and immediately after that. The hole is filled with a room temperature curable material while the screw is retracted to form an arch-shaped temporary support so that the collapse can be prevented even in the soft ground.

[0005]

However, in a mountain tunnel of a highway, the excavation width is about 21 m or more,
The excavation height is more than 12m, and there is a high risk of face collapse and roof collapse due to the large-diameter cross section. Especially in mountainous areas, there are many complicated formations, and conventional tunnel excavation methods pose a safety problem. However, a tunnel excavation method suitable for these severe natural conditions has not yet been developed in terms of work efficiency and economic efficiency.

The present invention has been made in view of the above circumstances, and in a mountainous region with many complicated formations and soft ground, a tunnel with a large diameter section can be safely used without risk of face cutting or roof collapse. It is also an object of the present invention to provide a tunnel excavation method and a tunnel inner wall construction method that enable efficient excavation and construction.

[0007]

In order to achieve the above object, the present invention provides a tunnel excavation method for excavating a large-diameter cross-section tunnel in two steps. A first step of laying a concrete track floor, a second step of installing a steel-structured arch frame on the concrete track floor, and an arched face face by a drum cutter movably mounted along the arch frame And a fourth step of excavating the remaining portion in the large-diameter cross-section tunnel left unexcavated by the third step.

Further, in the method of excavating a large-diameter cross-section tunnel in two steps for tunnel construction, the first step of laying a concrete raceway floor on the bottom of the advanced tunnel excavated at both sides of the tunnel, the concrete raceway. An arch frame of steel structure that can run on the floor is installed, and a second step of excavating the face face in an arch shape by a drum cutter movably mounted along the arch frame, the advanced guide laid in the first step. The third step of temporarily assembling the concrete segment for the tunnel wall into an arch shape by using the concrete segment support frame that can run on the track floor at the bottom of the mine. Fourth, the concrete segment temporarily assembled in the above is transported and installed at a predetermined position by using the segment support frame. A tunnel inner wall construction method characterized by comprising a degree, when performing the temporary assembly particularly concrete segments for the tunnel wall arched,
Keep the arched concrete segment support frame along the tunnel wall flat and lying down,
In addition, when transporting and installing a concrete segment for a tunnel wall temporarily assembled in an arch shape using the segment support frame, the segment support frame having an arch shape along the tunnel wall is erected vertically. It is characterized by being in a closed state.

[0009]

Next, the operation of the present invention will be described. When excavating a large-diameter cross-section tunnel in two steps, first, both sides of the tunnel are excavated to form an advanced tunnel, and the advanced tunnel thus excavated. Concrete is placed on the bottom of the mine to form a concrete trackbed, and rails are laid on it to construct a concrete trackbed. After that, a movable steel-structured arch frame is arranged on the concrete track floor, and a face face is excavated in an arch shape by a drum cutter movably mounted along the arch frame. Next, the remaining portion of the large-diameter cross-section tunnel, which is not excavated by the drum cutter and is not excavated, is excavated to excavate the large-diameter cross-section tunnel.

Further, when a large-diameter cross-section tunnel is excavated in two steps to form the inner wall surface and the tunnel inner wall is constructed, first, both sides of the tunnel are excavated to form an advanced tunnel, and the excavated advanced tunnel is formed. Concrete is placed on the bottom of the tunnel to form a concrete track, and rails are laid on it to construct a concrete trackbed. After that, a movable arch frame of steel structure is arranged on the concrete track floor, and the face face is excavated in an arch shape by a ram cutter movably mounted along the arch frame. Next, the concrete segment support frame was laid horizontally in the space where the concrete segment support frame was excavated using the concrete segment support frame that can travel on the track floor on the bottom of the advanced tunnel. Temporarily assemble the segments into an arch. In this way, the concrete segment assembled in an arch shape is moved in a vertically standing state, and the concrete segment assembled in an arch shape in the excavated arched excavation portion is moved to a predetermined position by using the segment support frame. Then, the inner wall surface of the tunnel is formed by lifting it by jack and installing it in a regular position.

[0011]

EXAMPLES Examples for carrying out the tunnel excavation method and tunnel inner wall construction method according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view of the entire work site of this embodiment, FIG. 2 is a cross-sectional explanatory view showing an arch frame and a segment support frame placed on the front face of a face, and FIG. 3 is a front view of the entire arch frame. .

In the figure, an arch frame A is provided with a shield portion 4 on the outer periphery of a main body 3 having moving wheels 2 on both lower ends 1 of a steel structure having an arch shape. It is composed of the plates 5 and 6 and the upper and lower plates 7 and 8, and a space 9 between the front vertical plate 5 and the rear vertical plate 6 is used for operation and monitoring of a worker's passage and a front excavator. As the moving wheel 2, an endless roller that can withstand a heavy load capable of traveling on a steel plate is used. A round hole 10 is provided in the front and rear vertical plates 5 and 6, and an operator goes in and out of the round hole 10 during operation while observing the excavation state and when performing repair and inspection of the excavator. . In addition, the shield part 4
The upper plate 7 extends back and forth to form an excavation space 11 and a concrete segment assembly space 12. Further, the shield portion 4 is provided with a plurality of shield jacks 13 that move forward in the arch frame body 3 over the entire circumference.

As shown in FIGS. 3 and 4, the arch frame body 3 is provided with a drum cutter provided with a large number of picks 14a, for example, a support 15 of the ranging drum cutter 14, and the lower plate 8 of the shield portion 4. Arched rail 16 fixed to the front and arched rail 1 fixed to the front vertical plate 5
Rollers 18 are engaged with and supported by 7 and 7, respectively.
Further, as shown in FIGS. 4 and 5, when the support 15 is moved in an arc, the drive gear 20 is engaged with the arch-shaped rack 19 fixed to the front vertical plate 5, and the rotation from the motor 21 is reduced by the speed reducer. The drive gear 20 is rotated through the cylinder 22, and a cylinder 22 is provided between the ranging drum cutter 14 and the support body 15 so that the drum cutter 14 is attached to the support body 15.
Can be displaced.

In order to excavate the large-diameter cross-section tunnel T according to this embodiment, first, both sides of the tunnel are excavated and the advanced tunnel 2
3 is formed, concrete is placed on the bottom surface of the excavated advanced tunnel 23 to form a concrete track, and a rail 24 is laid on it to construct a concrete track bed 25. After that, the arch frame A having a steel structure having the wheels 2 at both lower ends 1 capable of traveling on a steel plate laid on the concrete track floor 25 is arranged, and the arch frame body 3 thereof is arranged.
The drive gear 20 meshed with the arch-shaped rack 19 fixed to the front vertical plate 5 of the main body 3 along the two arch-shaped rails 16 and 17 installed in the main body 3 is decelerated and moved, and at that time, the ranging drum cutter The excavation is performed while displacing 14 with respect to the support body 15, thereby excavating the face face in an arch shape. During this excavation, the arch frame A and the main body of the ranging drum cutter 14 are covered and protected by the upper plate 7 of the shield part 4. Next, the remaining excavation remaining part R other than the arch shape excavated by the ranging drum cutter 14 in the large diameter section tunnel is excavated by the general excavator D to complete the excavation of the large diameter section tunnel T.

Next, when constructing the inner wall of the excavated large-diameter cross-section tunnel T, the concrete segment support frame B shown in FIGS. 6 and 7 has a pin 28 at the center.
The arch support body 29 has a pair of L-shaped cross-sections and is rotatably connected to each other by a carriage 30 that runs on the rail 25 of the concrete roadbed 24. It is held by a support base 32 which can be rotated by a hydraulic cylinder 31 in the traveling direction. The arch support body 29 can be moved up and down with respect to the carriage 30 by the up and down hydraulic cylinders 33, and both lower end portions of the arch support body 29 can be opened by the left and right adjusting hydraulic cylinders 34. There is. Reference numeral 35 is a guide when the arch support body 29 is lifted by the vertical hydraulic cylinder 33.

In order to construct an inner wall in the tunnel T excavated by using the concrete segment support frame B of this embodiment, the support base 32 of the carriage 30 traveling on the rail 24 of the concrete track bed 25 constructed earlier is mounted. The arch support main body 29 is erected horizontally by the hydraulic cylinder 31 and then the arch support main body 29 is laid down horizontally, and then a large number of concrete segments 36 for tunnel wall surfaces are temporarily assembled in an arch shape on the arch support main body 29 having an L-shaped cross section.

In this way, the concrete segment 36 temporarily assembled in the shape of an arch is vertically erected by the hydraulic cylinder 31 via the support 32, and the truck 3 is provided.
0 moves on the rail 24. After the shield jack 13 of the arch frame body 3 is contracted, the truck 30 is stopped at a predetermined location where the inner wall of the excavated arch-shaped excavation portion should be constructed, and the concrete segment 36 assembled in the arch shape is moved up and down on the truck 30. Hydraulic cylinder 33
Is lifted along the guide 35, and both lower end portions of the arch support body 29 are expanded by the left and right adjusting hydraulic cylinders 34, so that the pair of foundation concrete segments 37 installed in advance in the concrete roadbed in the advanced tunnel 23. The above-mentioned temporarily assembled concrete segment 3
6 is placed to form the inner wall surface P of the tunnel. Cement milk is injected between the finally constructed concrete segment 36 and the tunnel to perform backfilling 38.

Further, as shown in FIG.
In the case of constructing a basic concrete trackbed 39 in which a horizontal concrete trackbed and a foundation concrete segment are integrally formed with each other, an L-shaped steel plate 40 is laid on the basic concrete trackbed 39 to endure a heavy load. An arch frame A having a plurality of rollers 41 runs on it. In addition, when the above-mentioned basic concrete raceway floor 39 is constructed, the concrete segment support frame B
In order to construct the inner wall of the large-diameter cross-section tunnel T excavated by using the concrete segment 36 assembled in an arch shape by stopping the trolley 30 at a predetermined place as described above.
Guide 3 by means of a hydraulic cylinder 33 for vertical movement of the carriage 30
5, the lower ends of the arch support body 29 are further expanded, and the temporarily assembled concrete segment 36 is placed on the foundation concrete raceway floor 39 in the advanced tunnel 23 in advance. The inner wall surface P is formed.

[0019]

According to the present invention described above, when excavating a large-diameter cross-section tunnel, first, an advanced tunnel is formed on both sides of the tunnel, and a concrete raceway floor is constructed in the advanced tunnel, and then this concrete is constructed. Since the face is excavated in an arch shape with an arch frame equipped with a drum cutter that can run on the orbit floor, there is no risk of face cutting or roof collapse in a large-diameter cross-section tunnel even in complex strata or in mountainous areas with soft ground. There is an effect that can be excavated safely and efficiently.

Further, when excavating a large-diameter cross-section tunnel, first, an advanced tunnel is formed on both sides of the tunnel, a concrete track floor is constructed in the advanced tunnel, and then a drum cutter is installed so that it can travel on the concrete track floor. The arch face is excavated in an arch shape by the mounted arch frame, and then the arch-shaped concrete segment support frame that can run on the track floor of the advanced guideway that was laid previously is horizontally laid down, and then the concrete segment for the tunnel wall surface is laid down. Is temporarily assembled in the shape of an arch, and the concrete segments assembled in the shape of an arch in this way are moved in a state of being vertically erected, and the concrete temporarily assembled in the shape of an arch in the excavated arch-shaped excavation part described above. Use the segment support frame to transport the segment to the specified position, and Therefore, the inner wall surface of the tunnel can be easily lifted to form a tunnel of large diameter safely and efficiently without danger of face collapse or roof collapse even in complicated strata or mountainous areas with soft ground. Not only that, there is an effect that the wall surface can be quickly constructed.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of the entire work site of this embodiment.

FIG. 2 is a cross-sectional explanatory view showing a work situation of the present embodiment.

FIG. 3 is a front view of the entire arch frame of the present embodiment.

FIG. 4 is a front view of the ranging drum cutter according to the present embodiment.

FIG. 5 is a plan view of the ranging drum cutter according to the present embodiment.

FIG. 6 is a side view of the concrete segment support frame of the present embodiment.

FIG. 7 is a front view of the concrete segment support frame of the present embodiment.

FIG. 8 is a front view of the inner wall of the large-diameter cross-section tunnel according to the present embodiment.

FIG. 9 is a partial cross-sectional explanatory view of another embodiment.

FIG. 10 is a partial explanatory view of a concrete segment support frame of another embodiment.

[Explanation of symbols]

 A Arch frame B Concrete segment support frame P Tunnel inner wall surface T Large diameter section tunnel 3 Arch frame body 4 Shield part 5 Front vertical plate 6 Rear vertical plate 7 Upper plate 8 Lower plate 11 Excavation space 12 Assembly space 13 Shield jack 14 Ranging drum Cutter 15 Support 23 Advanced tunnel 25 Concrete track floor 29 Arch support body 30 Cart 31 Hydraulic cylinder 32 Support stand 33 Vertical hydraulic cylinder 34 Horizontal adjustment hydraulic cylinder 36 Concrete segment 37 Foundation concrete segment 39 Foundation concrete raceway floor 41 Endless Coro

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masayuki Jozuka Inventor Masayuki Kazuka 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo Inside Expressway Technology Center (72) Hiroyuki Ito 2-28 Asahimachi, Omuta City, Fukuoka Prefecture Stock company Mitsui Miike Plant Miike Plant (72) Inventor Kikuo Sakai No. 102 Ueda, Tenpaku-cho, Tenpaku-cho, Nagoya City, Aichi Prefecture

Claims (4)

[Claims] 1. In a tunnel excavation method for excavating a large-diameter cross-section tunnel in two steps, a first step of laying a concrete track floor on the bottom of an advanced tunnel excavated at both sides of the tunnel, running on the concrete track floor. The second step of installing an arch frame of possible steel structure, the third step of excavating the face face in an arch shape by the drum cutter movably mounted along the arch frame, and the uncut portion by the third step And a fourth step of excavating the remaining portion in the large-diameter cross-section tunnel. 2. A method of performing excavation of a large-diameter cross-section tunnel in two steps for tunnel construction, the first step of laying a concrete raceway floor on the bottom of an advanced tunnel excavated at both sides of the tunnel, the concrete raceway. An arch frame of steel structure that can run on the floor is installed, and a second step of excavating the face face in an arch shape by a drum cutter movably mounted along the arch frame, the advanced guide laid in the first step. The third step of temporarily assembling the concrete segment for the tunnel wall into an arch shape by using the concrete segment support frame that can run on the track floor at the bottom of the mine. Fourth step of transporting and installing the temporarily assembled concrete segment at a predetermined position using the segment support frame The method for constructing an inner wall of a tunnel, which comprises: 3. When the concrete segment for the tunnel wall surface is temporarily assembled in an arch shape, the concrete segment supporting frame having an arch shape along the tunnel wall surface is horizontally laid down. The tunnel inner wall construction method according to claim 2. 4. When a concrete segment for a tunnel wall surface temporarily assembled in an arch shape is transferred and installed at a predetermined position using the segment support frame, an arch-shaped segment support frame along the tunnel wall surface is used. The method for constructing an inner wall of a tunnel according to claim 2, wherein the tunnel inner wall is vertically erected.