JP3778648B2 - Shield engraving machine for corner excavation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a shield excavation for corner excavation for excavating a corner portion of an outer peripheral wall when constructing an outer peripheral wall of a tunnel having a large diameter and a rectangular cross section by excavating a plurality of tunnels and connecting their lining bodies. Related to the machine.
[0002]
[Prior art]
When excavating a conventional (ultra) large-diameter tunnel, it has been conventionally proposed to construct an outer peripheral wall around the large-diameter tunnel in order to reliably maintain the collapsed earth pressure. This outer peripheral wall is the primary lining body of a small-diameter tunnel, for example, the assembled segments are connected to each other to construct the outer peripheral wall. However, when the small-diameter tunnel to be excavated is a tunnel having a circular cross section, A tunnel with a rectangular cross section is desirable because it is necessary to remove excess earth and sand for connecting the lining bodies. Moreover, when connecting the primary lining body of the small diameter tunnel of a rectangular cross section, it is easy to form a large diameter tunnel of a rectangular cross section.
[0003]
[Problems to be solved by the invention]
By the way, when constructing the outer peripheral wall of a large-diameter tunnel with a rectangular section by arranging the lining bodies of small-diameter rectangular section tunnels, it is particularly troublesome at the corners of the corners, usually by two shield machines. The formed rectangular small diameter tunnel is formed to connect the primary lining bodies.
[0004]
However, there are problems that it takes time to dig two shield machines in the corner portion and to connect the lining bodies, and high accuracy is required and the cost is high.
[0005]
The invention according to claim 1 of the present invention solves the above-mentioned problems and excavates and covers the corner portion in a short time with high accuracy and low cost when constructing the outer peripheral wall of the large-diameter rectangular section tunnel. An object of the present invention is to provide a shield excavator for corner excavation that can form a work body.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention is configured to construct a peripheral wall of a tunnel having a large diameter and a rectangular cross section by excavating a plurality of tunnels and connecting their covering bodies. A shield excavator for excavating a corner portion of an outer peripheral wall, comprising an L-shaped shield main body, a plurality of cutter heads arranged at the front of the shield main body, and a front end portion serving as the cutter head A plurality of cutter actuators that constitute a parallel link manipulator by a plurality of telescopic actuators that are rotatably connected and whose rear end portions are rotatably connected to the shield main body, and are arranged at the rear of the shield main body L An erector device for assembling a primary lining segment along the cross section, and each cutter head is orthogonal to the shield axis by the cutter driving device. It is obtained by configured to excavate the shield body in front of the natural ground by reciprocating in the space including the surface.
[0007]
According to the above configuration, each cutter driving device reciprocates the plurality of cutter heads in a range that does not interfere within a plane orthogonal to the shield axis, thereby excavating an L-shaped tunnel in the front ground. A segment with a cross-section can be assembled. Therefore, the corners can be efficiently excavated in a short time and the segments can be assembled with high accuracy.
[0008]
According to the invention of claim 2, each cutter head having the above structure has a cutter face plate formed by combining columnar frames in a lattice shape, earth and sand intakes formed in spaces between the columnar frames, and the columnar frames. And a number of protruding cutter bits.
[0009]
According to the above configuration, the cutter head can secure the necessary strength over the entire surface with a simple structure, can ensure a wide closed surface and effectively support the collapsed earth pressure, and can provide an intake of excavated earth and sand. It can be arranged uniformly over the entire surface, and excavated sediment can be taken in and discharged efficiently.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of the shield machine for corner excavation according to the present invention will be described with reference to FIGS.
[0011]
First, an outline of a tunnel having a large-diameter rectangular section excavated by this shield machine will be described with reference to FIGS. For example, as shown in FIG. 6, the large-diameter tunnel has a rectangular cross section, and two road spaces B and C are formed inside the large-diameter tunnel lining body A, and road spaces B and C having a normal width Wa are formed. The large-diameter tunnel covering body A gradually expands from the width W1 to W2 from one end of the width W1 to the other end of the width W2 where the wide road spaces B and C such as ramps and toll gates are formed. It is formed to be.
[0012]
As shown in FIGS. 7 (a) and 7 (b), this large-diameter tunnel lining body A has an L-shaped cross section tunnel cover formed in an L-shaped cross section tunnel excavated by the shield machine of the present invention at the four corners. The construction body F, the center rectangular tunnel covering body G in the center, and the connecting rectangular tunnel covering body H connecting the L-shaped cross section tunnel covering body F and the center rectangular tunnel covering body G are configured.
[0013]
Next, the shield machine of the present invention for excavating an L-shaped tunnel will be described.
1 to 5, reference numeral 1 denotes a shield main body having an L-shaped cross section, and two cutter heads 2A and 2B which are smaller than the cross section of the shield main body 1 and divided into two on the diagonal line connecting the corner portions are provided at the front portion thereof. Has been placed. In the front part of the shield main body 1, a pressure chamber 3 is formed to hold a collapsed earth pressure and a pressure chamber 6 is formed. Two cutter drives for driving the cutter heads 2A and 2B to the pressure partition 3 respectively. Devices 4 and 4 are arranged. Each of the cutter driving devices 4 and 4 is a set of two, each having a front end portion rotatably connected to the cutter head 2 and a rear end portion rotatably connected to the pressure bulkhead 3 of the shield body 1. It is constituted by a parallel link manipulator composed of hydraulic cutter drive cylinders 5A to 5H which are a total of eight sets of four telescopic actuators.
[0014]
Each of the cutter heads 2A and 2B is formed into a pentagon obtained by dividing an L shape somewhat smaller than the cross section of the shield body 1 into two along the diagonal line, and a plurality of columnar frames 32 are provided in the pentagonal frame frame 31. Are cut and connected in a slanted lattice pattern at predetermined intervals to form a cutter face plate 30, and a columnar frame 32 and a through space surrounded by the frame 31 and the columnar frame 32 are formed in the earth and sand intake port 33. A large number of cutter bits 34 and 35 project from the outer periphery of the frame frame 31 and the front surface of the columnar frame 32 at predetermined intervals.
[0015]
As shown in FIG. 3, the parallel link manipulator constituting the cutter head driving device 4 has a base R of the eight cutter driving cylinders 5 </ b> A to 5 </ b> H, the pressure bulkhead 3 which is a platform, and a rectangular rectangle R in front view. It is connected to the vicinity of the corner via a rotary joint 21. Further, the front end portions of the cutter driving cylinders 5A to 5H are connected to the rear surfaces of the cutter heads 2A and 2B as end effectors through the rotary joints 22 in the vicinity of the corners of the rhombus D that is vertically long in front view.
[0016]
The rotary joints 21 and 22 of the cutter driving cylinders 5A to 5H may be spherical joints or universal joints, but in this embodiment, the rotational range is wide in the driving direction and narrow in the direction perpendicular to the rotational direction. As shown in FIG. 4, a spherical bush specification joint is used. That is, a pair of fixed brackets 24 project from the pressure bulkhead 3 or the attachment member 23 of the cutter head 2, and a movable bracket 25 that projects loosely between the fixed brackets 24 projects from the cutter drive cylinders 5A to 5H. Yes. A spherical bush 26 is rotatably fitted in a spherical recess 25a formed in the movable bracket 25, and a pin hole 26a is formed in the spherical bush 26. A support pin 27 is passed through a pin hole of the fixed bracket 24 and a pin hole 26a of the spherical bush 26, and the pressure bulkhead 4 or the cutter head 2 and the cutter driving cylinders 5A to 5H are connected. Therefore, the cutter driving cylinders 5A to 5H can be rotated in a wide range around the support pin 27, and can be rotated in a narrow range within a plane including the axis of the support pin 27 by the spherical bush 26.
[0017]
As shown in FIG. 2, the pressure bulkhead 3 has a mud pipe 7 </ b> A penetrating the upper part and connected to the pressure chamber 6, and a mud pipe 7 </ b> B penetrating the lower part and connected to the pressure chamber 6. A soil removal device is configured. The pressure bulkhead 3 is provided with an agitator 8 that rotates the stirring blades to stir and fluidize the excavated sediment.
[0018]
At the rear part of the shield body 1, three erector devices 11A, 11B, and 11C for assembling the segment F, which is a primary lining body, are disposed. As shown in FIG. 5, the erector devices 11 </ b> A to 11 </ b> C each have a movable frame 13 that is guided by a guide rail 12 and can be shifted in the vertical direction or the horizontal direction, and an axis that is parallel to the shield axis of the movable frame 13. The revolving frame 14 is provided around the revolving frame 14, and the segment holding device 16 is provided on the revolving frame 14 through the revolving link arm 15 so as to be able to be retracted and retracted. Can be assembled into an L-shaped cross section.
[0019]
In addition, a plurality of propulsion jacks 17 for propelling the shield main body 1 are provided at the rear part of the shield main body 1 using the segments F assembled by the above-described elector devices 11A to 11C as reaction force receivers.
[0020]
In the above configuration, when excavating the tunnel, the hydraulic oil supplied and discharged from the hydraulic pump to the cutter head drive device 4 is controlled by a cutter drive control device (not shown), and the cutter drive cylinders 5A to 5H are controlled to expand and contract. The cutter heads 2A and 2B are driven to reciprocate in the left and right directions and the up and down directions in a plane orthogonal to the shield axis, and the ground bits are excavated by the cutter bits 34 and 35. Then, the excavated sediment is taken into the pressure chamber 6 from the sediment intake 33, mixed with the mud supplied from the mud pipe 7A, and stirred by the agitator 8 to give appropriate fluidity, and then the mud is discharged. It is discharged from the tube 7B. Also, the cutter heads 2A and 2B are controlled to expand and contract each cutter drive cylinder 5A to 5H, thereby causing the cutter heads 2A and 2B to move in parallel in the front-rear direction according to the soil and excavation conditions, and to tilt with respect to the plane orthogonal to the shield axis. It is possible to excavate satisfactorily, and to easily excavate and control the attitude of the shield body 1.
[0021]
According to the above embodiment, the two cutter heads reciprocally driven in the vicinity of the plane perpendicular to the shield axis by the cutter driving devices 4 and 4 comprising parallel link manipulators at the front of the shield body 1 having an L-shaped cross section. Since 5A and 5B are arranged, a tunnel having an L-shaped cross section can be excavated in front of the shield main body 1 at a time, and the segment F can be assembled into an L-shaped cross section by the elector apparatuses 11A to 11C. Therefore, the corner portion of the outer peripheral wall A of the large-diameter rectangular tunnel can be constructed with high accuracy in a short time by a single excavation machine, and the construction cost can be reduced.
[0022]
Further, since the cutter driving device 4 is constituted by a parallel link manipulator composed of eight sets of four cutter driving cylinders 5A to 5H, the cutter head 2 can be stably supported at four locations and can transmit power. The space of the pressure partition 3 can be made large within the mounting position of the base end portion of the cylinders 5A to 5H, and the degree of freedom of installation of the supply / discharge mud pipes 7A, 7B, the agitator 8, and the like can be expanded.
[0023]
Further, since the cutter heads 2A and 2B are formed by the rectangular frame 31 and the columnar frame 32 combined in a lattice shape, the cutter face plate 30 is formed, and the earth and sand intakes 33 are evenly arranged on the cutter face plate 30. Thus, the necessary strength can be ensured over the entire surface, and the excavated earth and sand can be uniformly taken into the pressure chamber 6 to enable stable excavation.
[0024]
【The invention's effect】
As described above, according to the first aspect of the present invention, each cutter driving device reciprocally drives a plurality of cutter heads in a range that does not interfere with each other in a plane orthogonal to the shield axis, thereby providing a front ground. An L-shaped cross section can be excavated in a mountain and an L-shaped segment can be assembled. Therefore, the corners can be efficiently excavated in a short time and the segments can be assembled with high accuracy.
[0025]
Further, according to the invention of claim 2, the cutter head can ensure the necessary strength over the entire surface with a simple structure, can ensure a wide closed surface and effectively indicate the collapse earth pressure, Can be arranged uniformly over the entire surface, and the excavated earth and sand can be taken in and discharged efficiently.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a shield machine for corner excavation according to the present invention.
FIG. 2 is a side sectional view of the shield machine.
FIG. 3 is a schematic front view showing a cutter driving device of the shield machine.
FIG. 4 is a cross-sectional view showing a rotary joint of the cutter driving device.
FIG. 5 is a rear view of the shield machine.
FIG. 6 is a perspective view showing an outline of a large-diameter rectangular tunnel excavated using the shield machine.
7A and 7B are cross-sectional views showing the excavation procedure of the large-diameter rectangular tunnel, FIG. 7A being a cross-sectional view at a narrow position, and FIG. 7B being a cross-sectional view at a wide position. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield body 2A, 2B Cutter head 3 Pressure partition 4 Cutter drive device 5A-5H Cutter drive cylinder 7A Mud pipe 7B Drain pipe 11A-11B Elector device 17 Propulsion jack 30 Cutter face plate 31 Frame frame 32 Columnar frame 33 Sediment intake 34, 34 Cutter bit F segment (L-shaped tunnel lining body)
A Large-diameter rectangular tunnel lining body

Claims (2)

A corner excavation shield machine that excavates the corner of the outer peripheral wall when constructing the outer peripheral wall of a tunnel with a large diameter and a rectangular cross section by excavating a plurality of tunnels and connecting the lining bodies. ,
A shield body having an L-shaped cross section, a plurality of cutter heads arranged at the front portion of the shield body, a front end portion being rotatably connected to the cutter head, and a rear end portion being freely rotatable to the shield body A plurality of cutter driving devices that constitute a parallel link manipulator by a plurality of connected telescopic actuators, and an erector device that is arranged at the rear of the shield body and assembles a primary lining segment along an L-shaped cross section,
A shield excavation for excavating a corner portion, wherein the cutter head is configured to excavate a natural ground in front of the shield body by reciprocating each cutter head in a space including a plane perpendicular to the shield axis by the cutter driving device. Machine. Each cutter head includes a cutter face plate formed by combining columnar frames in a lattice shape, earth and sand intake ports formed in spaces between the columnar frames, and a number of cutter bits protruding from the columnar frames. 2. A shield machine for excavating a corner according to claim 1, wherein the shield machine is a corner excavator.

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