JP3640499B2 - Leading cutter device for backfilling agent injection pipe in shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leading cutter device for a backfilling agent injection pipe in a shield machine capable of cutting a portion facing the backfilling agent injection pipe on the inner peripheral surface of the tunnel excavated at the same time.
[0002]
[Prior art]
Conventionally, an example of this type of shield machine is shown in FIG. This is one in which a plurality of backing agent injection pipes 3 project from the rear part of the outer peripheral surface of the excavator main body 2 rotatably provided with the cutter head 1 at a predetermined interval along the circumferential direction. 5 (see FIG. 5), the cutter head 1 is driven to rotate to excavate the face 4 to excavate the tunnel 5 and at the same time pass through the backer agent injection pipe 3 from the inside of the machine 2. A back-filling agent such as mortar is ejected rearward from the rear end opening 3 a of the agent injection pipe 3, and the ejected back-filling agent is located between the segment 6 continuing behind the excavator main body 2 and the inner peripheral surface of the tunnel 5. The gap is filled.
[0003]
As shown in FIGS. 6 and 7, since the back agent injection pipe 3 protrudes outward from the outer peripheral surface of the excavator main body 2, the back agent injection pipe 3 on the outer peripheral surface of the excavator main body 2. A plurality of fixed bits 7 are protruded at a more suitable front position, and the inner peripheral surface of the tunnel 5 is cut with the plurality of fixed bits 7 as the excavator main body 2 moves forward, and the backing agent injection pipe 3 is damaged. I'm trying not to be.
[0004]
[Problems to be solved by the invention]
In the above conventional configuration, since the cutting ability of the fixed bit 7 is low, for example, a NOMST wall for earth retaining of a start tunnel, an intermediate mine, and an arrival mine of a shield tunnel (high-strength concrete using limestone coarse aggregate is made of carbon fiber. When excavating a hard ground such as a high-strength reinforcing material) with the cutter head 1, it is difficult to cut the hard ground with the fixed bit 7, and the cut earth and sand are inside the excavator body 2. Therefore, the cut earth and sand may be non-uniformly interposed between the inner peripheral surface of the tunnel 5 and the excavator main body 2 and the segment 6 and may adversely affect the natural ground and the excavator main body 2. .
[0005]
In view of the above problems, the present invention provides a leading cutter device for a backfilling agent injection pipe in a shield machine capable of reliably cutting even hard ground and capable of taking the cut earth and sand into the machine body. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a shield machine in which a backing agent injection pipe protrudes from the rear part of the outer peripheral surface of the machine main body provided with a cutter head rotatably at the front part. A concave portion with a soil removal device is formed at an appropriate position in front of the backing agent injection pipe on the outer peripheral surface of the excavator main body, and a rotary cutter is disposed in the concave portion so as to be movable in a radial direction of the excavator main body. A gate is provided to open and close the opening.
[0007]
In the above configuration, when excavating the hard ground, the cutting head is excavated by rotating the cutter head in a state where the tip of the rotary cutter protrudes to the outside from the outer peripheral surface of the excavator body, and the tunnel is Simultaneously with the excavation, the rotary cutter is rotationally driven to cut the portion of the inner peripheral surface of the tunnel facing the backing agent injection pipe, and the cut earth and sand are taken into the excavator body through the earth removing device, Backing agent such as mortar is ejected backward from the backfilling agent injection pipe, and the backfilling agent is filled in the gap between the segment following the back of the machine body and the inner peripheral surface of the tunnel. .
[0008]
In this case, since the rotary cutter is driven to rotate, the cutting ability is high, and even hard ground such as a soil retaining NOMST wall can be cut reliably, and there is no possibility of damaging the backing agent injection pipe. . In addition, the cut earth and sand are taken into the excavator main body through the earth removing device, and the cut earth and sand as in the past is unevenly distributed between the inner peripheral surface of the tunnel and the excavator main body and the segment. Since it is not interposed, the ground and excavation machine main body are not adversely affected by the cut earth and sand. Furthermore, after the excavation of the hard ground is completed, the opening is closed by the gate, thereby preventing the earth and sand from flowing into the recess from the opening and preventing the collapse of the natural ground.
[0009]
The invention according to claim 2 is characterized in that the earth removing device includes a mud feeding pipe communicating with the concave portion and a mud discharging pipe communicating the concave portion with a pressure chamber on the cutter head side.
[0010]
According to the above configuration, by supplying muddy water into the concave portion through the mud pipe, the cutting soil collected in the concave portion is made into a slurry, and then the slurry-like soil is passed through the mud pipe to the cutter head. It can be efficiently discharged to the ground by slurry transport together with the excavated sediment by the cutter head.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a back agent injection pipe preceding cutter device for a shield machine according to an embodiment of the present invention, and the front of the back agent injection pipe 3 on the outer peripheral surface of the machine 2 is shown. An opening 9 is formed at a location facing the atmospheric chamber of the excavator body 2, and a bottomed cylindrical outer cylinder 12 that forms a recess 11 with a soil removal device 10 communicating with the opening 9 is an excavator body. The rotary cutter 13 is fixed to the back surface of the outer wall portion 2, and the rotary cutter 13 is disposed in the recess 11 so as to be movable in the radial direction of the excavator main body 2, and the cutter driving device 14 and the rotary cutter for driving the rotary cutter 13 to rotate. 13 is provided with a cutter moving device 15 for reciprocating 13 along the radial direction of the excavator main body 2, and a gate 16 for opening and closing the opening 9 is provided.
[0012]
As shown in FIGS. 1 to 3, the rotary cutter 13 is set to have substantially the same diameter as the width of the back-filling agent injection tube 3 and is slidably and rotatably disposed in the outer cylinder 12 via a bearing bush 17. An inner cylinder 13a, a cross frame 13b laid in a cross shape in the inner cylinder 13a, and a cutter bit 13c fixed to a tip portion protruding above the inner cylinder 13a of the cross frame 13b. ing.
[0013]
As shown in FIGS. 1 and 2, the cutter driving device 14 passes through a seal box 18 that protrudes from the center of the lower surface of the cross frame 13 b and is fixed to the bottom wall portion of the outer cylinder 12. A cutter shaft 21 rotatably supported by the fixed bearing 20 and a drive motor 25 attached to the moving frame 19 and linked to the cutter shaft 21 via sprocket wheels 22 and 23 and a chain 24. The rotary cutter 13 can be driven to rotate by driving the drive motor 25.
[0014]
As shown in FIG. 2, the cutter moving device 15 includes a hydraulic cylinder 28 such as a pair of left and right hydraulic cylinders and pneumatic cylinders connected to a bracket 26 protruding from the outer peripheral surface of the outer cylinder 12 via a connecting pin 27. The tip of the piston rod 28a of each fluid pressure cylinder 28 is connected to a pair of left and right arms 29 projecting from the moving frame 19 via connection pins 30, respectively, and each fluid pressure cylinder 28 is driven to extend and contract. By doing so, the rotary cutter 13 can be reciprocated along the radial direction of the machine body 2.
[0015]
As shown in FIG. 1, the earth discharging device 10 includes a mud pipe 32 with an on-off valve 31 communicating with the recess 11 and a mud pipe 33 communicating the recess 11 with the pressure chamber 1 a on the cutter head 1 side. ing.
[0016]
As shown in FIG. 2, the gate 16 is opened and closed by a fluid pressure cylinder 34 such as a hydraulic cylinder or a pneumatic cylinder.
In the above configuration, when excavating a hard ground such as a soil retaining NOMST wall by the cutter head 1, as shown by a virtual line in FIG. 1, the gate 16 is opened and the opening 9 is opened. The cutter head 1 is driven to rotate in a state in which the rotary cutter 13 is moved in the radially outward direction by the cutter moving device 15 so that the tip of the rotary cutter 13 protrudes outside the outer peripheral surface of the main body 2 of the engraver. At the same time as excavating the face 4 and excavating the tunnel 5, the rotary cutter 13 is rotationally driven by the cutter driving device 14 to cut the portion of the inner peripheral surface of the tunnel 5 facing the backing agent injection pipe 3 and cutting it. The earth and sand are collected in the recess 11, and the collected earth and sand is made into a slurry form with the muddy water supplied into the recess 11 through the mud pipe 32, and then the slurry earth and sand is discharged into the mud pipe. 3 to flow into the pressure chamber 1a of cutter head 1 side via the by discharging to the ground a slurry transport integrally with excavation soil by the cutter head 1.
[0017]
In this case, since the rotary cutter 13 is driven to rotate, the cutting ability is high, and even the hard ground such as a soil retaining NOMST wall can be cut reliably, and the backing agent injection pipe 3 may be damaged. There is no. Further, the cut earth and sand are taken into the excavator main body 2 through the earth discharging device 10, and the earth and sand cut as in the prior art is formed between the inner peripheral surface of the tunnel 5, the excavator main body 2 and the segment 6. Since there is no non-uniform intervening therebetween, the cut earth and sand do not adversely affect the ground and the excavator main body 2.
[0018]
After the excavation of the hard ground, the gate 16 is closed and the opening 9 is closed (see the solid line in FIG. 1), thereby preventing soil and sand from flowing into the recess 11 from the opening 9. Prevent the collapse of.
[0019]
【The invention's effect】
According to the first aspect of the present invention, since the rotary cutter is driven to rotate, the cutting ability is high, and for example, it can be cut reliably even on hard ground such as a soil retaining NOMST wall. There is no risk of damage. In addition, the cut earth and sand are taken into the excavator main body through the earth removing device, and the cut earth and sand as in the past is unevenly distributed between the inner peripheral surface of the tunnel and the excavator main body and the segment. Since it is not interposed, the ground and excavation machine main body are not adversely affected by the cut earth and sand. Furthermore, after the excavation of the hard ground is completed, the opening is closed by the gate, thereby preventing the earth and sand from flowing into the recess from the opening and preventing the collapse of the natural ground.
[0020]
According to the second aspect of the present invention, by supplying muddy water into the recess through the mud pipe, the cut soil collected in the recess is made into a slurry, and then the slurry is removed from the mud pipe. Then, it can flow into the pressure chamber on the cutter head side and can be efficiently discharged to the ground by slurry transportation together with the excavated sediment by the cutter head.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a leading cutter device for a backfilling agent injection pipe in a shield machine according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the same.
FIG. 3 is a view taken along arrow AA in FIG. 2;
FIG. 4 is a schematic plan view showing a leading cutter device for a backfilling agent injection pipe in a conventional shield machine.
FIG. 5 is a schematic front view of the main part.
FIG. 6 is an enlarged cross-sectional view of the main part.
FIG. 7 is a side view of the main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutter head 1a Pressure chamber 2 Excavator main body 3 Backing agent injection pipe 9 Opening part 10 Earth removal apparatus 11 Recess 13 Rotating cutter 16 Gate 32 Mud pipe 33 Mud pipe

Claims (2)

In a shield machine with a back-filling agent injection pipe projecting from the rear part of the outer peripheral surface of the engraving machine main body provided with a cutter head rotatably at the front part, in front of the back-filling agent injection pipe on the outer peripheral surface of the machine A recess with a soil removal device is formed in the recess, a rotary cutter is disposed in the recess so as to be movable in a radial direction of the excavator body, and a gate for opening and closing the opening of the recess is provided. The leading cutter device for the backfilling agent injection pipe in the shield machine. 2. The back of the shield machine according to claim 1, wherein the earth removing device includes a mud pipe that communicates with the concave part and a mud pipe that communicates the concave part with a pressure chamber on the cutter head side. Leading cutter device for the filler injection tube.

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