JP3693465B2 - Leading cutter for backfilling pipe of shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a lining body that is excavated in the tunnel and assembled at the rear of the shield machine, and a backfilling agent injection pipe for injecting a backfilling agent between the ground and the outer surface of the shield body are projected. The present invention relates to a leading cutter for a backfilling agent injection pipe for preventing breakage of the backfilling agent injection pipe when passing through the excavation of a hard ground or bedrock, a start hole, an intermediate hole, and a wall of an arrival hole in a shield machine.
[0002]
[Prior art]
Conventionally, there exist some which are shown in FIGS. 5-8 as an example of this kind of shield machine. 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 shield body 2 provided with the cutter head 1 rotatably at the front part at a predetermined interval along the circumferential direction. (See FIG. 6), the cutter head 1 is driven to rotate to excavate the face 4 to excavate the tunnel 5, and at the same time, the inside of the shield body 2 passes through the back agent injection pipe 3 to inject this back agent. The inner periphery of the segment 6 and the tunnel 5 which is a primary lining body in which a backing agent such as mortar is ejected rearward from the rear end opening 3a of the pipe 3 and the ejected backing agent is assembled behind the shield body 2 The gap between the surfaces is filled.
[0003]
As shown also in FIGS. 7 and 8, the back agent injection pipe 3 protrudes outward from the outer peripheral surface of the shield body 2, so that the front side of the back agent injection pipe 3 on the outer peripheral surface of the shield body 2. A plurality of fixed bits 7 are projected at appropriate positions, and the inner surface of the tunnel 5 is cut by the plurality of fixed bits 7 as the shield body 2 advances, so that the backing agent injection pipe 3 is not damaged. ing.
[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 hard wall for starting a hard rock or a tunnel, a middle wall or a retaining wall of an arrival mine (for example, NOMST wall: high strength concrete using limestone coarse aggregate) When excavating a hard ground such as a high-strength reinforcing material made of carbon fiber) with the cutter head 1, it is difficult to reliably cut the hard ground with the fixed bit 7, and a backing agent injection tube 3 may be damaged. Further, since the cut piece cannot be taken into the shield body 2, the cut piece is non-uniformly interposed between the inner peripheral surface of the tunnel 5 and the shield body 2 and the segment 6, so Adversely affected.
[0005]
In view of the above-mentioned problems, the present invention does not damage the backing agent injection pipe by securely cutting even the hard wall of the hard bedrock, starting, middle, or reaching hole, and the cutting piece is placed in the shield body. It is an object of the present invention to provide a leading cutter for a back-filling agent injection pipe of a shield machine that can be taken in and excavated well.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 has a cutter head that is rotationally driven at the front portion of the shield body, and a primary lining body and a ground that are assembled on the rear outer surface of the shield body at the rear portion of the shield body. This is a leading cutter for a backfilling agent injection pipe of a shield machine in which a backfilling agent injection pipe for injecting a backfilling agent between the piles is provided, and is forward of the backfilling agent injection pipe on the outer peripheral surface of the shield body. A storage recess formed in a proper position, a rotary cutter that is arranged so as to be able to move out of and out of the storage recess and rotate around the axial center in the tunnel radial direction, and a mud pipe and storage connected to the storage recess A drainage device comprising a drainage pipe communicating with the pressure chamber at the rear of the cutter head from the recess , and a groove cutting bit for forming a groove on the cutting surface on the rotary cutter, and a cutting with the groove formed Surface cutting bit to cut the surface When it is obtained by providing the inlet incorporate shavings in the storage recess.
[0007]
According to the above configuration, when excavating hard ground such as hard rock or hard wall, the cutter head is driven to rotate with the tip of the rotary cutter protruding outward from the outer peripheral surface of the shield body. By advancing the shield body, the hard ground is excavated to form a tunnel. At the same time, the rotary cutter is driven to rotate to cut the hard ground in front of the backing agent injection pipe on the inner peripheral surface of the tunnel.
[0008]
As described above, the rotationally driven rotary cutter has a high cutting ability. For example, even in the case of a hard wall reinforced with a reinforcing fiber such as a soil retaining NOMST wall, the reinforcing fiber is first embedded in the wall by a groove cutting bit. Is cut short, and then the wall body itself is scraped off with a surface cutting bit, so that the hard wall body in front of the backfilling agent injection tube can be surely cut, and the backfilling agent injection tube is not likely to be damaged.
[0009]
In addition, since the excavated sediment and cutting pieces are taken into the accommodating recess from the intake of the rotary cutter and sent from the sludge pipe to the pressure chamber by the earth removing device, the cutting pieces are shielded from the inner peripheral surface of the tunnel and the shield as in the past. There is no non-uniform intervening between the main body and the segment, and the ground pieces and the shield main body are not adversely affected by the cut pieces.
[0010]
According to the second aspect of the present invention, a tip groove cutting bit for forming a groove on a cutting surface on a tip surface of the rotary cutter, a tip surface cutting bit for cutting a cutting surface on which the groove is formed, and a cutting piece are stored in the recess And an intake to be taken in.
[0011]
According to the above configuration, in addition to advancing the shield machine with the rotary cutter protruding and cutting the hard ground, the shield machine is stopped at regular intervals and the rotary cutter is protruded at each stop. The hard ground in front of the back-filling agent injection pipe can be excavated by drilling the hard ground and continuing the drilled portion. Thus, it is possible to excavate the leading hole in any hard ground by two methods, and its application range is wide.
[0012]
.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as the past, and description is abbreviate | omitted.
[0013]
An opening 9 is formed at a location facing the inside of the atmospheric chamber 2c of the shield body 2 in front of the backing agent injection pipe 3 on the outer peripheral surface of the shield body 2. A bottomed cylindrical outer cylinder 12 is fixed to the back surface of the skin plate 2 a in the opening 9 to form a storage recess 11 with a soil removal device 10. Further, in the shield main body 2, a rotary cutter 41 disposed in the storage recess 11 so as to be freely retractable in the radial direction of the shield main body 2, a cutter driving device 14 for rotationally driving the rotary cutter 41, and a rotation A cutter retracting device 15 for driving the cutter 41 in and out along the radial direction of the shield body 2 and a gate 16 for opening and closing the opening 9 are provided.
[0014]
As shown in FIGS. 1 to 2, the rotary cutter 41 is set to have substantially the same diameter as the width of the back-filling agent injection tube 3, and is arranged to be slidable and rotatable in the outer cylinder 12 via the bearing bush 17. The inner cylinder 42, a cross frame 43 installed in a cross shape in the inner cylinder 42, and a cutter portion 44 fixed to a tip portion of the cross frame 43 protruding above the inner cylinder 42. ing.
[0015]
As shown in FIGS. 3 and 4, the cutter portion 44 has a cross frame 44b fixed on a ring frame 44a, and a bit mounting frame 44c standing on the ring frame 44a at regular intervals in the circumferential direction. . An outer peripheral surface cutting bit 45A, which is one of the surface cutting bits to be cut in contact with the cutting surface, is attached to the front portion in the rotational direction on the outer peripheral side of the cross frame 44b and the bit mounting frame 44c, and the outer peripheral surface cutting is performed. Cutting a plurality of arc-shaped outer circumferential grooves, which is one of groove cutting bits that protrude from the cutting surface by the bit 45A and form a circumferential groove on the cutting surface at a predetermined pitch and cut reinforcing fibers or the like contained in the hard ground. Bits 46A protrude in the axial direction at predetermined intervals. Further the end face of the cross frame 44b and the bit mounting frame 44c, with the one side cutting bit for cutting in surface contact with the cutting surface leading end surface cutting bit 45B is attached, from the cutting surface by the distal end surface cutting bit 45B A tip groove cutting bit 46B, which is one of a plurality of arc-shaped groove cutting bits that protrude and form grooves in the rotational direction at a predetermined pitch in the radial direction and cut reinforcing fibers or the like contained in the hard ground, is provided in the radial direction. It protrudes at predetermined intervals. A space between the cross frames 44 b in the ring frame 44 a is configured as a cutting piece intake 47 that communicates with the housing recess 11.
[0016]
As shown in FIGS. 1 and 2, the cutter driving device 14 has a cutter shaft 21 protruding from the center of the bottom surface of the cross frame 13 b that penetrates a seal box 18 fixed to the bottom wall portion of the outer cylinder 12. Then, it is rotatably supported by the bearing 20 of the moving frame 19. A drive motor 25 attached to the moving frame 19 is coupled to the cutter shaft 21 via sprocket wheels 22 and 23 and a chain 24. Therefore, the rotary cutter 41 can be driven to rotate by driving the drive motor 25.
[0017]
As shown in FIG. 2, the cutter retracting device 15 is provided with a pair of left and right hydraulic cylinders 28 such as hydraulic pressure and pneumatic pressure via a connecting pin 27 on a bracket 26 protruding from the outer peripheral surface of the outer cylinder 12. 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 connecting pins 30. Therefore, the rotary cutter 41 can be reciprocated along the radial direction of the shield body 2 by driving each fluid pressure cylinder 28 to extend and contract.
[0018]
As shown in FIG. 1, the earth discharging device 10 includes a mud pipe 32 with an on-off valve 31 connected to the storage recess 11 and a mud pipe connected from the storage recess 11 to the pressure chamber 2 b at the rear of the cutter head 1. 33.
[0019]
As shown in FIG. 2, the gate 16 has a gate plate 16b slidably fitted in a gate recess 16a formed in the upper portion of the outer cylinder 12, and is connected to the gate plate 16b. The fluid pressure cylinder 34 opens and closes.
[0020]
In the above configuration, when excavating a hard wall body such as a soil retaining NOMST wall with the cutter head 1, the gate 16 is opened to open the opening 9 as shown by the phantom line in FIG. The rotary cutter 41 is moved by the retracting device 15 so that the cutter portion 44 protrudes outward from the outer peripheral surface of the shield body 2. Then, by rotating the cutter head 1 and moving the shield body 2 forward, the hard wall body is excavated to form a leading groove. Then, the rotary cutter 41 is rotationally driven by the cutter driving device 14 to cut the front portion of the back-filling agent injection tube 3 on the inner peripheral surface of the tunnel formed on the hard wall. At this time, first, a circumferential groove is formed on the cutting surface by the outer circumferential groove cutting bit 46A, and the embedded reinforcing fiber is cut, and the outer circumferential surface cutting bit 45A is brought into surface contact with the cutting surface on which the groove is formed and excavated. Thus, the hard wall body in which the reinforcing fibers are contained can be effectively cut. Then, the cut pieces are collected from the inlet 47 of the rotary cutter 41 into the storage recess 11, and the recovered cut pieces are slurried by the muddy water supplied into the storage recess 11 through the mud pipe 32, and then the mud is discharged. It flows into the pressure chamber 2b on the cutter head 1 side through the pipe 33, and is discharged to the ground by slurry transport together with excavated sediment by the cutter head 1.
[0021]
In addition, 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 sediment from flowing into the storage recess 11 from the opening 9. Can prevent the collapse of natural ground.
[0022]
In another excavation type, the shield body 2 is intermittently moved at intervals smaller than the excavation diameter of the rotary cutter 41, and when the stop is stopped, the rotary cutter 41 is protruded and moved by the cutter retracting device 15 so that a leading hole is formed in the hard ground. Form. At this time, a groove in the rotational direction is formed on the cutting surface by the tip groove cutting bit 46B, and the tip surface cutting bit 45B comes into surface contact with the cutting surface on which the groove is formed to cut, so that the reinforcing fiber is contained in the hard surface. The wall body can be effectively cut off. By repeating this, it is possible to form a leading groove that continues the leading hole and prevents damage to the backfilling agent injection tube 3. In addition to the preceding groove excavation by the outer peripheral groove cutting bit 46A and the outer peripheral surface cutting bit 45A, by using the front end groove cutting bit 46B and the front end surface cutting bit 45B in combination, all kinds of hard ground can be excavated, Life can be extended.
[0023]
According to the above embodiment, since the rotary cutter 41 is driven to rotate, the cutting ability is high, and a combination of the outer peripheral groove cutting bit 46A and the outer peripheral surface cutting bit 45A even with a hard wall body such as a soil retaining NOMST wall. Thus, the cutting can be surely performed, and the backing agent injection tube 3 is not likely to be damaged. Further, the cutting piece is taken into the shield main body 2 through the earth removing device 10, and the cutting piece is not uniform between the inner peripheral surface of the tunnel 5 and the shield main body 2 and the segment 6 as in the prior art. Therefore, the cut pieces do not adversely affect the natural ground and the shield main body 2.
[0024]
【The invention's effect】
As described above, according to the first aspect of the present invention, the rotary cutter that is rotationally driven has a high cutting ability. For example, even a hard wall reinforced with reinforcing fibers such as a soil retaining NOMST wall, By cutting the reinforcing fibers contained in the wall body with a groove cutting bit, and then cutting off the wall body with a surface cutting bit, the hard wall body in front of the backfilling agent injection pipe is surely cut to form a leading groove. And there is no risk of damaging the backfilling tube.
[0025]
In addition, since the excavated sediment and cutting pieces are taken into the accommodating recess from the intake of the rotary cutter and sent from the sludge pipe to the pressure chamber by the earth removing device, the cutting pieces are shielded from the inner peripheral surface of the tunnel and the shield as in the past. There is no non-uniform intervening between the main body and the segment, and the ground pieces and the shield main body are not adversely affected by the cut pieces.
[0026]
According to the second aspect of the invention, in addition to advancing the shield machine with the rotary cutter protruding and cutting the hard ground, the shield machine is stopped at regular intervals and rotated at every stop. The hard ground in front of the back-filling agent injection pipe can be excavated by causing the cutter to protrude to perforate the hard ground and making this perforated part continuous. Thus, it is possible to excavate the leading hole in any hard ground by two methods, and its application range is wide.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a leading cutter for a back-filling agent injection pipe of a shield machine according to an embodiment of the present invention.
FIG. 2 is a transverse sectional view of the preceding cutter.
FIG. 3 is a plan view showing a cutter portion of the rotary cutter.
FIG. 4 is a side view showing a cutter portion of the rotary cutter.
FIG. 5 is a schematic plan view showing a preceding cutter device for a backfilling agent injection pipe in a conventional shield machine.
FIG. 6 is a schematic front view of the main part.
FIG. 7 is an enlarged cross-sectional view of the main part.
FIG. 8 is a side view of the main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutter head 2 Shield main body 2b Pressure chamber 3 Backing agent injection pipe 9 Opening part 10 Earth removal apparatus 11 Storage recessed part 14 Cutter drive device 15 Cutter withdrawal apparatus 16 Gate 32 Mud pipe 33 Mud pipe 41 Rotating cutter 45A outer peripheral surface Cutting bit
45B Tip cutting bit
46A Peripheral groove cutting bit 46B Tip groove cutting bit 47 Inlet

Claims (2)

Backing agent injection that has a cutter head that is rotationally driven at the front of the shield body, and injects a backfilling agent between the primary lining body assembled at the rear of the shield body and the ground on the rear outer surface of the shield body. A preceding cutter for a backfilling agent injection pipe of a shield machine in which a pipe is disposed,
A storage recess formed on the outer peripheral surface of the shield body in front of the backfilling agent injection tube, and a rotary cutter that rotates about the axis in the tunnel radial direction and is arranged to be able to move out of and out of the storage recess. And a soil discharge device comprising a mud pipe connected to the storage recess and a drain pipe connected to the pressure chamber at the rear of the cutter head from the storage recess ,
The rotary cutter is provided with a groove cutting bit for forming a groove on a cutting surface, a surface cutting bit for cutting a cutting surface on which the groove is formed, and an intake for taking a cutting piece into a storage recess. Leading cutter for backfilling agent injection pipe of shield machine.   A tip groove cutting bit for forming a groove on the cutting surface, a tip surface cutting bit for cutting the cutting surface on which the groove is formed, and an inlet for taking the cutting piece into the storage recess are provided on the tip surface of the rotary cutter. The preceding cutter for the backfilling agent injection pipe of the shield machine according to claim 1.

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