JPH06294279A - Roof shield construction method and device therefor - Google Patents

Abstract

PURPOSE:To safely excavate a roof tunnel and to reduce the construction cost of the tunnel. CONSTITUTION:Traveling rails 4, 5 are laid on respective right and left bottom pilot tunnels 2, 3 excavated at a necessary interval from each other, and a roof shield device 10 having a roof 15 extending between the bottom pilot tunnels 2, 3, a transverse rail 22, and an excavator 23 which travels transversely along the transverse rail 22, is placed on the traveling rails 4, 5 so that it can travel thereon. With the excavator 23 traveling transversely along the transverse rail 22, the working face between the bottom pilot tunnels 2,3 is excavated into a ring shape and the roof shield device 10 is propelled along the traveling rails 4, 5 to construct a segment 19 on the outer peripheral surface of the ring- shaped excavated portion between the bottom pilot tunnels 2, 3 at the rear of the roof shield device 10. The above processes including transverse excavation, propulsion of the roof shield device, and construction of the segment are repeated to construct a roof tunnel 37.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a construction method for constructing a tunnel having a large width (a flat shape), a construction method as shown in FIGS. 8 to 11 has been used. That is, first, as shown in FIG. 8, after excavating two bottom guide tunnels a and b extending in parallel at a required distance on the left and right by a known means, both bottom guide tunnels a and b are excavated. As shown in FIG. 9, a substantially L-shaped concrete wall c which will later become a side wall of the tunnel and a part of the roadbed is formed at each of the outer and lower corners by casting.

Next, an entire range f surrounded by a line connecting the bottoms of the concrete walls c and c in a straight line and a line connecting the upper sides of the outer surfaces of the concrete walls c and c in a semicircular shape. The earth and sand are manually dug or excavated by an excavating machine such as a backhoe, and as shown in FIG. 10, a semi-circular shield excavator A is installed movably in the excavating direction between the upper sides of both concrete walls c, c. To be done. While advancing the shield excavator A in accordance with the excavation of the tunnel, well-known means are provided behind the shield excavator A between the horizontal portions below the concrete walls c and c and the semicircular portions above. Then, concrete is poured to construct a tunnel E having a large width as shown in FIG.

[0004]

However, in the above-mentioned conventional tunnel construction method, at the same time, excavating a wide range of earth and sand in a range that connects the upper direction and the lower direction of both left and right concrete walls, that is, substantially the entire cross section of the tunnel. Therefore, the excavation cross-sectional area becomes large and there is a risk that the earth and sand of the face will collapse and collapse, which poses a problem in terms of work safety, and in order to excavate this wide range of earth and sand at the same time, a shield excavator must be installed. It had to be large in size, resulting in high manufacturing costs and high construction costs.

The present invention has been devised in order to solve the above-mentioned conventional problems, and it is possible to reduce the safety of tunnel construction and the construction cost by dividing and excavating a pair of bottom tunnels. It is an object of the present invention to provide a roof shield construction method and a device therefor configured as described above.

[0006]

According to the present invention, a traveling rail is laid on each of two bottom guide shafts excavated at a required distance on the left and right sides, and the traveling rail is provided on both traveling rails. A roof shield device having a roof extending across a bottom tunnel and a traverse rail and having an excavating device traversing along the traverse rail is movably mounted, and the excavating device traverses along the traverse rail. While excavating the front surface between both bottom tunnels in a ring shape while propelling the roof shield device along the traveling rail, the outer peripheral surface of the ring excavated portion between both bottom tunnels at the rear part of the roof shield device. A roof shield construction method characterized by building a roof tunnel by assembling segments, repeating these steps of traverse excavation, roof shield device propulsion, and segment assembly, and the required space between left and right A traveling rail laid on each of the two bottom guide tunnels that are arranged and excavated, and a roof shield device that can travel along the traveling rails and that is straddled across the two bottom guide tunnels. The roof shield device includes a traverse rail provided between the upper sides of the both bottom guide shafts, a segment assembly device provided at a rear portion in the excavation direction, and a traverse rail along the traverse rail. A roof shield device, comprising: an excavating device that is supported and excavates a front surface of the roof shield device in a ring shape; and the excavating device includes a traverse stand that traverses along a traverse rail by a traverse drive device. A moving rod supported on the traverse table so as to move back and forth by a jacking jack, and a rotary cutter attached to a front end of the moving rod so as to be vertically tiltable by a tilting jack. Those of the roof shield apparatus according to claim and.

[0007]

According to the first and second aspects of the present invention, after excavating the earth and sand on the front surface by the cutter of the excavator in the roof shield device, the excavator is traversed along the traverse rail to a predetermined position, and the earth and sand on the front surface is again removed. Excavate. By repeating this excavation, the entire width of the traverse rail, that is, the earth and sand in front of the bottom tunnel is excavated in a ring shape. Simultaneously with this excavation, segments are assembled on the outer peripheral surface of the ring-shaped excavated portion behind the roof shield device by the segment assembly device. After the traverse excavation, the roof shield device is propelled along the traveling rail for a predetermined distance, and then the traverse excavation by the excavator, the roof shield device propulsion, and the segment assembly work are repeated to repeat the work between the bottom tunnels. Build a tunnel.

According to the invention of claim 3, the front and rear positions of the rotary cutter of the excavator are moved by the excavation jack in relation to the excavation state of the roof shield device, and the rotary cutter is tilted up and down by the tilting jack. Excavate the earth and sand in front of the roof shield device up and down several times.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a roof shield construction method and its apparatus according to the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of a roof shield construction method and an apparatus therefor according to the present invention. As shown in FIG. 5, from a vertical shaft 1 vertically excavated from the ground, as shown in FIG. , Two bottom tunnels that extend in parallel with the required spacing on the left and right 2,
3 is excavated by hand or by mechanical means, and left and right traveling rails 4, 5 are laid in each of the bottom guide tunnels 2, 3.

The bottom guide shafts 2 and 3 are excavated in advance while being reinforced by commonly known reinforcing means.
In the excavated bottom tunnels 2 and 3, a substantially L-shaped concrete wall 6 which will later become a side wall of the tunnel and a part of the roadbed is formed by casting. At the time of this concrete pouring, the base of the fixture 7 is embedded together, the rail base 8 is fixed to the fixture 7, and the traveling rails 4 and 5 are laid on the rail base 8. A discharge conveyor 9 for discharging excavated earth and sand to the outside is attached to the rail base 8 so as to be freely movable.

The roof shield device 10 is placed on the traveling rails 4, 5 of the bottom guide shafts 2, 3. The roof shield device 10 has a frame body 11 having a curved middle and high length extending across the upper portions of the bottom tunnels 2 and 3, and the support legs 12 are provided at the lower ends on both sides of the frame body 11. The mounted traveling base 13 is mounted so as to travel on the traveling rails 4 and 5 via traveling wheels 14. A curved roof 15 extending between the upper portions of the bottom tunnels 2 and 3 is integrally fixed to the upper side of the frame body 11,
A movable hood 17 having a hydraulic jack 16 is provided on the front side of the roof 15, and a roof 15 is provided on the rear side while traversing along a curved rail 18 for the assembly device.
Segment assembly device 2 for assembling the segment 19 at the rear part
No. 0, and a propulsion jack 21 for propelling the roof shield apparatus 10 by taking a reaction force to the assembled existing segment 19a.

A traverse rail 22 curved along the frame body 11 is attached to the roof shield device 10, and an excavator 23 is attached to the traverse rail 22.
Is provided. In the illustrated case, two excavation devices 23 are provided. As shown in FIGS. 2 to 4, the excavation device 23 is supported so as to be traversable along the traverse rail 22 via traverse wheels 24 and meshes with a gear 25 provided on the traverse rail 22. A traverse table 29 in which traverse is driven by a traverse driving device 28 including a traverse motor 27 having a pinion 26, a moving rod 30 movably supported forward and backward with respect to the traverse table 29, and the movement. A rotary cutter 32 attached to the front end of the rod 30 via a cutter driving device 31, and a digging jack 3 for moving the moving rod 30 back and forth with respect to the traverse table 29.
3 and 3. Further, a cutter driving device 31 supporting the rotary cutter 32 is attached to the front end of the moving rod 30 so as to be vertically tiltable via a pin 34, and the cutter driving device 31 and the moving rod 30 are tilted. A rotary cutter 3 is installed in the vertical position between the front ends.
Tilt jacks 35, 36 for tilting the direction of 2 up and down are provided. In the figure, 37 indicates a ring-shaped roof tunnel formed between the bottom tunnels 2 and 3.

Next, a method of constructing the ring-shaped roof tunnel 37 with the roof shield device having the above structure will be described. As shown in FIG. 5, two bottom guide shafts 2 and 3 extending in parallel at the right and left of the bottom of the vertical shaft 1 are excavated by a known manual excavation or mechanical means, and the excavation is performed. Rail stand 8 for each of the bottom tunnels 2 and 3
The left and right traveling rails 4, 5 are laid via the.

Subsequently, on the traveling rails 4 and 5, a traverse rail 22 extending upward between the bottom guide shafts 2 and 3 and curving upward is provided.
Like the traverse rail 22, the roof shield apparatus 10 having the roof 15 curved upward and having the segment assembly apparatus 20 at the rear is movably mounted, and the traverse rail of the roof shield apparatus 10 is further mounted. An excavation device 23 equipped with a rotary cutter 32 that traverses the traverse rail 22 and moves forward and backward to excavate the earth and sand on the front surface of the roof shield device 10 in a ring shape is installed on 22.

In this state, the excavation jack 33 pushes the front surface of the rotary cutter 32 of the excavator 23 against the surface of the earth to be excavated to rotate the rotary cutter 32, so that the excavator 23 traverses along the traverse rail 22 and the rotary cutter. 32 Excavate earth and sand on the front side in a ring shape. After repeating this excavation, when the front surface of the rotary cutter 32 is excavated to the extension limit of the excavation jack 33, that is, when the front surface is excavated so that the roof shield device 10 can be advanced by repeating the excavation work, the excavation jack is performed. Rotating cutter 3 by reducing 33
After pulling in 2, the extension of the propulsion jack 21 that takes a reaction force in the existing segment 19a advances the entire roof shield device 10 along the traveling rails 4 and 5 for a required distance, and the excavation by the rotary cutter 32 is performed again. Repeat the work to perform, and at the same time as this excavation, the segment assembly device 2
By assembling the segment 19 at the rear part by 0 and connecting both bottom guide tunnels 2 and 3 to each other, a ring-shaped roof tunnel 37 is constructed between the bottom guide tunnels 2 and 3.

When the rotary cutter 32 of the excavator 23 is vertically tilted by the tilting jacks 35 and 36 to excavate the earth and sand on the front surface of the roof shield device 10 up and down a plurality of times, FIG. As shown in FIG. 6, first, the rotary cutter 32 is turned upward by the tilting jacks 35 and 36 to excavate the upper earth and sand between the bottom tunnels 2 and 3, and then, as shown in FIGS. The rotary cutter 32 is directed downward by the jacks 35 and 36 to excavate the earth and sand below the excavated portion, whereby the earth and sand on the front surface are excavated so that the roof shield device 10 can move forward. In any case, the excavated roof tunnel 3
The excavated earth and sand falling along 7 is received by a discharge conveyor 9 mounted movably on a rail base 8 and discharged outside.

The present invention is not limited to the above-described embodiment, but the mechanism of the excavator provided on the traverse rail, for example, the rotary cutter has a drum shape, and the excavating blade is provided on the peripheral surface of the excavator. While excavating the front side of the sand while traversing, or using a disk-type rotary cutter and a drum-type rotary cutter together, the number of rotary cutters is not limited, and within the range not departing from the gist of the present invention. Of course, various changes can be made.

[0018]

According to the first and second aspects of the present invention, the roof tunnel between the two bottom tunnels can be excavated by the roof shield device in the minimum necessary range, and at the same time, the roof is excavated. Since the segment of the tunnel is assembled, not only can the excavation cross-sectional area of the roof tunnel be reduced to prevent landslides at the face, but even if the face has a small landslide, the worker There is no danger, and it is possible to safely excavate, and since the upper surface of the roof tunnel has a safety strength secured by the segments, the earth and sand below it can be safely excavated by any excavation method. Further, even when constructing a tunnel with a large width, at least two steps of excavating the cross section of the entire tunnel from the roof part and the lower part are performed, so that the tunnel can be constructed with a shield excavator that is smaller than conventional ones. It also has the effect of reducing the overall construction cost.

According to the third aspect of the invention, it is possible to further reduce the size of the shield excavation device and increase the work efficiency.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention viewed in a tunnel excavation direction, in which the left half and the right half are viewed from different positions.

FIG. 2 is a view on arrow AA of FIG.

3 is a BB direction arrow view of FIG. 2 with a part omitted.

FIG. 4 is a side view of the excavator.

FIG. 5 is a side view showing an outline of a roof shield construction method.

FIG. 6 is a front view showing a state of excavation by the excavator.

7 is a front view showing another excavation state of FIG. 6. FIG.

FIG. 8 shows an example of a conventional shield construction method, and is a front view showing construction of two parallel bottom tunnels.

FIG. 9 is a front view showing a concrete wall formation state in the bottom tunnel, which is carried out after FIG.

FIG. 10 is a front view showing an installed state of the shield excavation device, which is carried out after FIG.

FIG. 11 is a front view of a tunnel with a large width, which is constructed after the shield method and is carried out after FIG.

[Explanation of symbols]

2, 3 ... Bottom guide shaft 28 ... Traverse drive device 4, 5 ... Traveling rail 29 ... Traverse stand 10 ... Roof shield device 30 ... Moving rod 15 ... Roof 32 ... Rotating cutter 19 ... Segment 33 ... Excavation jack 20 ... Segment assembly device 35, 36 ...
..Tilting jacks 22 .... Transverse rails 37 ... Roof tunnel 23 ...

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Fujimoto 11-1 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima Heavy Industry Co., Ltd.

Claims (3)

[Claims] 1. Two excavated pieces are arranged at a required interval on the left and right.
An excavation device in which a traveling rail is laid on each of the bottom guide shafts of the book, a roof and a traverse rail extending between the both bottom guide shafts are provided on the both traveling rails, and traverses along the traverse rail. A roof shield device equipped with is movably mounted, and while excavating the excavating device along a traverse rail, the front face between both bottom tunnels is excavated in a ring shape, and the roof shield device is used as a traveling rail. A roof tunnel is constructed by assembling segments on the outer peripheral surface of the ring-shaped excavation part between the bottom tunnels at the rear of the roof shield device and repeating these steps of transverse excavation, roof shield device promotion, and segment assembly. Roof shield construction method characterized by: 2. The two excavated bodies are arranged at a required interval on the left and right.
The roof shield device comprises a traveling rail laid on each of the bottom guide shafts of the book, and a roof shield device that can travel along the traveling rails and is laid across between the bottom guide shafts. A traverse rail provided between the upper sides of the two bottom guide shafts, a segment assembly device provided at a rear portion in the excavation direction, and a roof shield device supported so as to traverse along the traverse rail. And a drilling device for drilling the front surface of the vehicle in a ring shape. 3. The excavation device includes a traverse table which traverses along a traverse rail by a traverse drive device, and a moving rod which is supported by the traverse table so as to be moved back and forth by an excavation jack.
3. The roof shield device according to claim 2, comprising a rotary cutter attached to the front end of the moving rod so as to be vertically tiltable by a tilting jack.