JPH10331593A - Leading cutter for back-filling material injection pipe of shield excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breaking of a cutter, particularly during excavation of a hard wall, by cutting a wall in front of a back-filling injection pipe projected form the outer surface of a shield main body. SOLUTION: A storage recess 11 is formed in an opening 9 formed in a shield main body 2 located in front of a back-filling material injection pipe, and a rotary cutter 41 driven and rotated by a cutter drive 14 and allowed to freely move in and out by a cutter moving device is placed within the storage recess 11. The rotary cutter 41 is provided with an outer-peripheral-groove cutting bit for cutting reinforcing fibers held within a hard wall, an outer- peripheral-surface cutting bit for cutting a cut plane where a groove is formed, and an intake through which debris excavated is taken into the storage recess 1, and a soil discharging device 10 whereby the excavated debris taken into the storage recess 11 is discharged into a pressure chamber is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing material injection pipe for injecting a backfill agent between a lining body excavated in a tunnel and at the rear of a shield machine and a ground. For a backing material injection pipe to prevent breakage of the backing material injection pipe when excavating through the wall of hard ground, rock, launch hole, intermediate hole, arrival hole in a shield excavator protruding from the outer surface of Regarding the preceding cutter.

[0002]

2. Description of the Related Art FIGS. 5 to 8 show an example of this type of shield machine. This is one in which a plurality of backing agent injection pipes 3 are protrudingly provided at predetermined intervals along the circumferential direction at a rear portion of an outer peripheral surface of a shield body 2 having a cutter head 1 rotatably provided at a front portion. 6 (see FIG. 6), the cutter head 1 is driven to rotate to excavate the cutting face 4 to excavate the tunnel 5, and at the same time, to pass the backing agent through the backing agent injection pipe 3 from within the shield body 2. Tube 3
The backing agent such as mortar is ejected rearward from the rear end opening 3a, and the ejected backing agent is attached to the inner surface of the segment 6 and the tunnel 5, which are the primary lining body assembled behind the shield body 2. To fill the gap between them.

As shown in FIGS. 7 and 8, the backing agent injection pipe 3 projects outward from the outer peripheral surface of the shield main body 2, so that the backing agent injection pipe 3 on the outer peripheral surface of the shield main body 2 is provided. 3
A plurality of fixed bits 7 are protrudingly provided at appropriate positions in front of the tunnel 5. 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. It is configured.

[0004]

In the above-mentioned conventional configuration,
Because the cutting ability of the fixed bit 7 is low, for example, a hard wall body for retaining rocks at starting, intermediate, and arrival pits of a hard rock or a tunnel (for example, NOMST wall: a high-strength concrete using limestone coarse aggregate and carbon fiber When excavating a hard ground such as one embedded with a strength reinforcing material) with the cutter head 1, it is difficult to reliably cut the hard ground with the fixed bit 7, and the backing agent injection pipe 3 may be damaged. is there. In addition, since the cut piece cannot be taken into the shield body 2, the cut piece is unevenly interposed between the inner peripheral surface of the tunnel 5 and the shield body 2 and the segment 6,
It adversely affects the ground and the shield body 2.

SUMMARY OF THE INVENTION In view of the above problems, the present invention reliably cuts hard rock and hard walls at the starting, intermediate and reaching holes without damaging the backing agent injection pipe, and shielding the cut pieces from shielding. An object of the present invention is to provide a leading cutter for a backing agent injection pipe of a shield machine capable of being taken into a main body and excavating well.

[0006]

In order to achieve the above object, the invention according to claim 1 has a cutter head that is driven to rotate at a front portion of a shield body, and a rear outer surface of a shield body is provided at a rear outer surface of the shield body. A backing agent injection pipe leading cutter for a shield excavator in which a backing agent injection pipe for injecting a backfill agent between the primary lining body assembled in step 1 and the ground is provided, and the outer peripheral surface of the shield body A storage recess formed at an appropriate position in front of the backing agent injection pipe, a rotary cutter disposed so as to be able to retreat outward from the storage recess, and a mud feed pipe and storage connected to the storage recess. An earth removal device comprising a drain pipe communicating from the recess to the pressure chamber at the rear of the cutter head, wherein the rotary cutter has a groove cutting bit for forming a groove on the cutting surface, and a cutting surface on which the groove is formed. Surface cutting bit to cut the It is provided with a the inlet incorporate pieces into the storage recess.

According to the above configuration, when excavating a hard ground such as a hard rock or a hard wall, the cutter head is rotated with the tip of the rotary cutter protruding outside from the outer peripheral surface of the shield body. By driving and moving the shield body forward, the hard ground is excavated to form a tunnel. At the same time, the rotary cutter is driven to rotate during the passage 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 rotary cutter driven to rotate has a high cutting ability. For example, even a hard wall body reinforced with reinforcing fibers such as a NOMST wall for earth retaining is first embedded in the wall body by a groove cutting bit. Cut the reinforced fiber short,
Then, by shaving the wall itself with a face cutting bit,
The hard wall in front of the backing agent injection tube can be reliably cut off, and there is no possibility that the backing agent injection tube is damaged.

[0009] Further, the excavated earth and sand and the cuttings are taken into the accommodating recess from the inlet of the rotary cutter, and sent to the pressure chamber from the mud pipe by the earth discharging device. There is no non-uniform interposition between the surface and the shield body and the segments, and the ground and the shield body are not adversely affected by the cut pieces.

According to a second aspect of the present invention, there is provided a groove cutting bit for forming a groove on the surface of a workpiece, a surface cutting bit for cutting a grooved surface, and a cutting tool. And an inlet for taking the piece into the storage recess.

According to the above construction, in addition to cutting the hard ground by advancing the shield excavator with the rotary cutter protruding, the advancing of the shield excavator is stopped at regular intervals,
Perforate the hard ground by protruding the rotating cutter every stop,
By making this perforated portion continuous, it is possible to excavate the hard ground in front of the backing agent injection pipe. As described above, the leading hole can be excavated in any hard ground in two ways, and its application range is wide.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. The same members as those in the related art are denoted by the same reference numerals, and description thereof is omitted.

Back filler injection tube 3 on the outer peripheral surface of shield body 2
An opening 9 is formed at a position further forward and facing the inside of the atmosphere chamber 2c of the shield main body 2. A bottomed cylindrical outer cylinder 12 is fixed to the opening 9 on the back surface of the skin plate 2a, and a storage recess 11 with an earth discharging device 10 is formed. Further, in the shield main body 2, a rotary cutter 41 disposed in the storage recess 11 so as to be able to move back and forth in the radial direction of the shield main body 2, a cutter driving device 14 for driving the rotary cutter 41 to rotate, A cutter retracting device 15 for driving the cutter 41 to extend and retract along the radial direction of the shield body 2, and a gate 1 for opening and closing the opening 9.
6 are provided.

As shown in FIGS. 1 and 2, the rotary cutter 41 is set to have substantially the same diameter as the width of the backing agent injection pipe 3.
An inner cylinder 42 slidably and rotatably disposed in the outer cylinder 12 via the bearing bush 17, a cross frame 43 laid in a cross shape in the inner cylinder 42, and an inner cylinder 42 of the cross frame 43. And a cutter portion 44 fixed to a tip portion projecting upward.

As shown in FIGS. 3 and 4, the cutter section 44 has a cross frame 44b on a ring frame 44a.
Are fixed, and bit mounting frames 44c are erected 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 for making a surface contact with the cutting surface and cutting, is attached to the outer peripheral side of the cross frame 44b and the bit mounting frame 44c at the front in the rotation direction. A plurality of arc-shaped outer peripheral groove cuttings, which are one of the groove cutting bits for forming a circumferential groove on a cutting surface at a predetermined pitch and projecting from a cutting surface by a bit 45A and cutting a reinforcing fiber or the like contained in hard ground. Bits 46A protrude at predetermined intervals in the axial direction. Further, a tip surface cutting bit 45B, which is one of the surface cutting bits for cutting in contact with the cutting surface, is attached to the tip surfaces of the cross frame 44b and the bit mounting frame 44c, and protrudes from the cutting surface formed by the end surface cutting bit 45B. The tip groove cutting bit 46B, which is one of a plurality of arc-shaped groove cutting bits for forming a groove in the rotation direction at a predetermined pitch in the radial direction and cutting a reinforcing fiber or the like contained in the hard ground, is formed in the radial direction. It is projected at predetermined intervals. Then, the cross frame 4 in the ring frame 44a
The space between 4b is formed as an intake 47 of the cutting piece communicating with the housing recess 11.

As shown in FIGS. 1 and 2, the cutter driving device 14 includes a seal box in which a cutter shaft 21 protruding from the center of the lower surface of the cross frame 13b is fixed to the bottom wall of the outer cylinder 12. 18 and is rotatably supported by a bearing 20 of a moving frame 19. Then, the drive motor 25 attached to the moving frame 19 is
It is configured to be linked to the cutter shaft 21 via a chain 23 and a chain 24. Therefore, this drive motor 2
By driving the rotary cutter 5, the rotary cutter 41 can be driven to rotate.

As shown in FIG. 2, the cutter retracting device 15 has a pair of left and right hydraulic cylinders 28 such as hydraulic and pneumatic via a connecting pin 27 on a bracket 26 projecting from the outer peripheral surface of the outer cylinder 12. And each of its hydraulic cylinders 2
The distal ends of the eight piston rods 28a are connected to a pair of left and right arms 29 projecting from the moving frame 19 via connecting pins 30, respectively. Therefore, the rotary cutter 41 can be reciprocated along the radial direction of the shield main body 2 by driving each hydraulic cylinder 28 to expand and contract.

As shown in FIG.
Mud pipe 32 with on-off valve 31 connected to storage recess 11
And the pressure chamber 2 at the rear of the cutter head 1 from the storage recess 11.
b.

As shown in FIG. 2, the gate plate 16b is slidably fitted in a gate recess 16a formed in the upper part of the outer cylinder 12, and the gate plate 16
b, hydraulic or pneumatic cylinder 34
It is opened and closed by.

In the above construction, when a hard wall such as a NOMST wall for excavation is to be excavated by the cutter head 1, the gate 16 is opened and the opening 9 is opened as shown by a virtual line in FIG. Then, the rotary cutter 41 is moved by the cutter retracting device 15 so that the cutter portion 44 protrudes outward from the outer peripheral surface of the shield main body 2. Then, by rotating the cutter head 1 and moving the shield body 2 forward, the hard wall is excavated to form a preceding groove. Then, the rotary cutter 41 is rotationally driven by the cutter driving device 14, and the front part of the backing agent injection pipe 3 on the inner peripheral surface of the tunnel formed in the hard wall is cut. At this time, first, the circumferential groove is formed on the cutting surface by the outer circumferential groove cutting bit 46A, and the reinforcing fibers contained therein are cut, and the outer circumferential surface cutting bit 4 is formed on the cut surface where the groove is formed.
By excavating the 5A in surface contact, the hard wall body in which the reinforcing fibers are embedded 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 collected cut pieces are passed through the mud feed pipe 32.
After the slurry is turned into slurry by the muddy water supplied into the storage recess 11 through the cutter head 1, the slurry flows into the pressure chamber 2 b on the cutter head 1 side through the drain pipe 33, and the slurry is transported together with the excavated earth and sand by the cutter head 1. Is discharged to the ground.

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), so that the earth and sand flows into the storage recess 11 from the opening 9. Can be prevented to prevent the collapse of the ground.

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 stopped, the rotary cutter 41 is protruded and moved by the cutter retracting device 15 to form a preceding hole in the hard ground. At this time, a groove in the rotation direction is formed on the cutting surface by the tip groove cutting bit 46B, and the tip surface cutting bit 45B is brought into surface contact with the cut surface on which the groove is formed and cut, whereby the hard fiber in which the reinforcing fiber is embedded is formed. The wall can be effectively cut and removed. By repeating this, the preceding hole can be formed by connecting the preceding holes to prevent the backing agent injection tube 3 from being damaged. In addition to the preceding groove excavation by the outer peripheral groove cutting bit 46A and the outer peripheral surface cutting bit 45A, the distal groove cutting bit 46B and the distal surface cutting bit 4A
By using 5B together, all kinds of hard ground can be excavated and the life of the bit can be prolonged.

According to the above embodiment, the rotary cutter 4
1 is driven to rotate, so that the cutting ability is high. For example, even a hard wall such as a NOMST wall for earth retaining can be reliably cut by the combination of the outer peripheral groove cutting bit 46A and the peripheral surface cutting bit 45A, There is no possibility that the backing material injection tube 3 is damaged. Further, the cut pieces are taken into the shield main body 2 via the earth discharging device 10, and the cut pieces are uneven between the inner peripheral surface of the tunnel 5 and the shield main body 2 and the segment 6 as in the related art. , The cutting pieces do not adversely affect the ground or the shield body 2.

[0024]

As described above, according to the first aspect of the present invention, the rotary cutter driven by rotation has a high cutting ability, and is hardened by reinforcing fibers such as a NOMST wall for earth retaining. Even on the wall, first, the reinforcing fiber inside the wall is cut short using a groove cutting bit, and then the wall itself is cut off using a surface cutting bit, so that the hard wall in front of the backing agent injection pipe is reliably cut off. Therefore, the leading groove can be formed, and there is no possibility that the backing agent injection tube is damaged.

Further, the excavated earth and sand and the cuttings are taken into the accommodating recess from the inlet of the rotary cutter and sent to the pressure chamber from the mud pipe by the earth discharging device. There is no non-uniform interposition between the surface and the shield body and the segments, and the ground and the shield body are not adversely affected by the cut pieces.

According to the second aspect of the present invention, in addition to cutting the hard ground by advancing the shield excavator with the rotary cutter protruding, the advance of the shield excavator is stopped at regular intervals and stopped. The hard ground is pierced by protruding the rotary cutter every time and the perforated portion is made continuous, so that the hard ground in front of the backing agent injection pipe can be excavated.
As described above, the leading hole can be excavated in any hard ground in two ways, and its application range is wide.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a preceding cutter for a backing material injection pipe of a shield machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the preceding cutter.

FIG. 3 is a plan view showing a cutter section of the rotary cutter.

FIG. 4 is a side view showing a cutter section of the rotary cutter.

FIG. 5 is a schematic plan view showing a prior cutter device for a backing 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 10 Discharge device 11 Storage recess 14 Cutter drive device 15 Cutter retraction device 16 Gate 32 Mud feed pipe 33 Drain pipe 41 Rotary cutter 45A Outer peripheral surface Cutting Bit 45B Outer Groove Cutting Bit 46A Tip Cutting Bit 46B Tip Groove Cutting Bit 47 Inlet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shingo Takahashi 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Within Hitachi Zosen Corporation (72) Inventor Shinji Kabuki 5 Nishikujo, Konohana-ku, Osaka-shi, Osaka Hitachi Shipbuilding Co., Ltd. (72) Inventor Yuji Tanaka 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka

Claims (2)

[Claims] A shield head is provided at the front of a shield body and is rotatably driven. A backfilling agent is injected into a rear outer surface of the shield body between a primary lining body assembled at the rear of the shield body and a ground. A backing material injection pipe leading cutter of a shield machine in which a backing material injection pipe to be disposed is provided, and a storage recess formed at an appropriate position forward of the backing material injection pipe on the outer peripheral surface of the shield body; A discharge cutter comprising a rotary cutter disposed so as to be able to retreat outward from the storage recess, a mud feed pipe connected to the storage recess, and a drain pipe connected from the storage recess to a pressure chamber at the rear of the cutter head. The rotary cutter, the rotary cutter, a groove cutting bit for forming a groove on the cutting surface, a surface cutting bit for cutting the grooved cutting surface, and an inlet for taking the cutting piece into the storage recess. Characterized by the provision of Urakomi injection pipe leading cutter Rudo excavator. 2. A groove cutting bit for forming a groove in a cutting surface, a surface cutting bit for cutting a grooved cutting surface, and an inlet for taking a cutting piece into a storage recess at a tip end surface of a rotary cutter. 2. A preceding cutter for a backing agent injection pipe of a shield machine according to claim 1, further comprising: