JPH0932480A - Cutter head for excavating concrete structures - Google Patents

Abstract

(57) [Abstract] [Problem] It is possible to effectively crush obstacles such as reinforced concrete structures, and the auxiliary construction method is as small as possible, and only the reinforced concrete penetration part of the side wall of the existing segment to be connected, the starting shaft, and the reaching shaft. Crush and penetrate. SOLUTION: An excavation cutter 25 for excavating the ground, which is rotatably supported by a front portion of a shield body 1, and a sediment intake 23.
In a cutter head for excavating a concrete structure in which a claw is formed, a cutting cutter device 27 having first to seventh rotary cutter bodies 31 to 31G capable of cutting a reinforcing bar on the front surface of the cutter head 7 and a concrete can be crushed. Crushing cutter device having a pair of roller cutter bodies 41A and 41B
28 and were placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure for excavating a reinforced concrete structure buried in the ground, for example, a PC pile, an existing tunnel segment, a protective wall of a starting or reaching vertical shaft without crushing the surroundings. A cutter head for excavating an object.

[0002]

2. Description of the Related Art Conventionally, when there is a reinforced concrete structure which cannot be excavated by a conventional shield machine during excavation, when a PC pile or the like is buried, a vertical shaft is dug from the ground and the PC pile or the like is excavated. Or the ground is improved by injecting a chemical solution or freezing to prevent the ground from collapsing, and a worker from the shield machine excavates the front of the cutter head and uses rock cutting, cutting tools, etc. Was crushed, and then the shield machine was started to resume excavation. In addition, when connecting the tunnel through the side of the existing tunnel segment, stop the shield machine just before the existing tunnel segment, improve the ground in front of the shield machine, and then the worker from the shield machine side. I went out and destroyed the connection surface of the existing tunnel segment with rock drilling, cutting tools, etc., removed the debris and connected the tunnel. Alternatively, a worker was excavating and crushing a through hole for connection from the existing tunnel segment side to the side wall. When starting the shield machine from the starting shaft, or when reaching the reaching shaft, the operator crushes and cuts the reinforced concrete or sheet pile etc. provided at the starting part or the reaching part of the shaft with a cutting tool and opens it. Was there.

[0003]

However, since the obstacles or the tunnel walls are crushed and removed manually by using the auxiliary construction method, a construction period and cost for the auxiliary construction method are required separately, and there is a risk in the work. There was a problem with it. In addition, as a conventional method for excavating an old buried pipe made of reinforced concrete, there is one that has a roller bit on the cutter head, but according to this method, a large pressing force is applied because the roller bit is pressed against an obstacle and crushed. Need and
In addition to adversely affecting the segment that receives the reaction,
Due to the large pressing force, the existing segment is crushed in a wide range including the penetrating portion, and there has been a problem that the repair of the connecting portion becomes large.

The present invention solves the above-mentioned problems and can effectively crush a reinforced concrete structure which is an obstacle with only a small amount of auxiliary construction, and the side wall of the existing segment to be connected, the starting shaft, and the reaching shaft. An object of the present invention is to provide a cutter head for excavating a concrete structure, which can crush and penetrate only a reinforced concrete penetrating portion of a shaft and can significantly reduce the construction period and cost.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a concrete structure rotatably supported by a front portion of a shield body and having an excavation cutter for excavating the ground and a sediment intake port. In a cutter head for excavating an object, a cutting cutter device capable of cutting a reinforcing bar and a crushing cutter device capable of crushing concrete are arranged in front of the cutter head.

Further, in the cutting device having the above structure, a plurality of disk-shaped rotary cutter bodies are rotatably arranged around an axis in a direction intersecting the shield axis and A hard cutting material is embedded in the outer peripheral portion, and a cutter rotating device for rotating each of these main bodies at high speed is provided.

Further, a cutting angle is formed on at least the side surface on the shield shaft center side on the outer peripheral portion of the rotary cutter body having the above structure. Further, the crushing cutter device having the above-described configuration includes a plurality of roller cutter bodies that are rotatably supported around a longitudinal axis, and a cutter moving device that moves these cutter bodies from the shield axial center side to the outer peripheral side. Then, insert the roller cutter body into the preceding hole formed corresponding to the shield shaft center part in the concrete structure,
Each of the roller cutter bodies is moved to the outer peripheral side by the cutter moving device to expand the leading hole.

Further, the crushing cutter device having the above structure is
A preceding hole excavating device for excavating a preceding hole having an outer diameter larger than the turning outer diameter of the roller cutter body moved to the shield axis side is provided, and the preceding hole excavating device is a single unit that can freely move forward and backward from the cutter head. Alternatively, it is composed of a plurality of core drill devices.

In the above structure, the ground is excavated by the excavating cutter, the reinforcing bar embedded in the concrete is cut by the cutting cutter device for the concrete structure, and the concrete is crushed by the crushing cutter device. Since it is destroyed, the reinforced concrete structure can be surely destroyed and penetrated only in a necessary area, and it is not necessary to perform a large-scale auxiliary construction method which has been conventionally required. Therefore, the construction period and cost can be significantly reduced.

Further, since the cutting main body of the cutting cutter device is rotated at a high speed, it is possible to reliably cut the reinforcing bars embedded in the concrete. Further, by forming a cutting angle on the outer peripheral portion of the cutting main body that swivels along with the swiveling of the cutter head, it is possible to effectively cut rebar and the like.

Furthermore, the crushing cutter device positioned on the shield shaft center side is fitted into the preceding hole formed in the concrete structure, and the crushing cutter device is moved to the outer peripheral side while rotating the cutter head. Thus, the leading hole can be gradually expanded to form a leading hole having a diameter corresponding to the cutter head. Therefore, only a small-scale auxiliary construction method is required to form a small-diameter leading hole in the concrete structure to be destroyed, and the pressing force of the cutter head against the concrete structure by the shield machine is sufficient. As a result, the construction period and cost can be significantly reduced, and the segment that receives the reaction force and the concrete structure to be crushed will not be adversely affected, and the crushed section will not expand more than necessary.

In addition, the preceding hole excavating device completely eliminates the need for an auxiliary construction method for forming an existing tunnel segment to be connected, a preceding hole from the reaching shaft, or a preceding hole from the shield machine side, so that the concrete structure can be safely and efficiently constructed. Can crush objects.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a shield machine having a cutter head for excavating a concrete structure according to the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the shield machine is a mud pressure type, and the shield body 1 is composed of a front body 1a and a rear body 1b which are foldably connected to each other via a center-folding jack 2 within a predetermined range. Has been done. A rotary partition wall 5 is rotatably supported via a swivel bearing 4 at the center of a pressure partition wall 3 provided at the front portion of the front body 1a, and the rotary partition wall 5 is supported by a plurality of support legs 6. The cutter head 7 is rotatably supported. Reference numeral 8 denotes a connecting leg which is provided through the shield shaft center O of the rotary partition wall 5 and connected to the cutter head 7, and which transmits and receives power and operation signals to and from the cutter head 7 via a slip ring and a rotary joint. . Further, the pressure partition wall 5 is provided with a mud feed pipe 10 for penetrating muddy water into the pressure chamber 9 at an upper part thereof, and a muddy pipe 11 for discharging muddy water and earth and sand and an agitator 12 for stirring at a lower part thereof. There is.

Revolving device 1 for rotationally driving the cutter head 7.
3 is a ring gear 14 provided on the outer periphery of the slewing bearing 4.
And a cutter drive pinion 15 that meshes with the ring gear 14, and a cutter drive motor 16 that rotationally drives the cutter drive pinion 15. 17 is an erector device provided on the rear body 1b to assemble the lining segment 18, and 19 is the assembled segment 1
8 is a propulsion jack for propelling the shield body 1 by using 8 as a reaction force.

As shown in FIG. 1, the cutter head 7 has a first spoke 21 arranged at a center position and a second spoke 22 which intersects the shield axis O of the first spoke 21 by 90 °. Four 90 ° fan-shaped cutter face plates 24 are provided on both sides of the first spokes 21 and the second spokes 22 via soil and sand intakes 23. The cutter face plate 24 is provided with a plurality of excavating cutters 25 that face the earth and sand intake 23 to excavate the ground, and a center bit 26 is attached to the shield shaft center O of the first spoke 21. In addition, the second spoke 2
2, a cutting cutter device 27 capable of cutting a steel material such as a reinforcing bar is provided at predetermined intervals, and the first spokes 21 are also provided.
Is a crushing cutter device that can crush concrete.
8 are provided.

As shown in FIGS. 3 and 4, the cutting cutter device 27 is a disk-shaped first to seventh rotary cutter body in which a hard cutting material such as a carbide tip or diamond is embedded in the outer peripheral portion. 31A to 31G, and first to third cutter rotating motors (cutter rotating devices) 32A to 32C that rotate and drive these units at high speed are provided. That is, as shown in FIG. 1, the first to seventh rotary cutter bodies 31A to 31G have short pitches (lengths of rebars to be cut) where the pitch p of the turning loci C1 to C7 caused by the turning of the cutter head 7 is substantially uniform. In such a manner, the ones closer to the shield axis O are alternately arranged on both sides.

Specifically, the second, fourth, and sixth rotary cutter bodies 31B, 31D, and 31F are the second spokes 2 on one side.
The front portion is arranged so as to project forward from a projecting hole 22a formed in the front surface of the No. 2. The second, fourth, and sixth rotary cutter bodies 31B, 31D, and 31F are rotatably supported around the radial interlocking shaft 33 and interlockingly coupled to each other, and the first cutter built in the second spoke 22. It is rotationally driven at high speed by the rotary motor 32A. Also, the first, third, fifth, and seventh rotary cutter bodies 31A, 31
C, 31E, 31G are arranged so that the front portions thereof respectively protrude forward from the protruding holes 22a of the second spokes 22 on the other side. The first, third, and fifth rotary cutter bodies 31A, 31C, and 31E are rotatably supported around the radial interlocking shaft 34 and interlockingly coupled to each other, and the second cutter built in the first spoke 21. Rotation motor 32B
Thus, it is rotationally driven at high speed via the bevel gear 35.
In addition, the rotary cutter body 31G arranged at the outermost position
Is arranged so that the rotary shaft is inclined so as to intersect the shield axis O in front of the cutter head 7, and the front end is located on the outer periphery of the cutter head 7, and the third cutter rotary motor 32C drives the bevel gear 36 at high speed. It is driven to rotate.

Further, the first to seventh rotary cutter bodies 31A to 31G have cutting angles α formed on both side surfaces of the outer peripheral portion thereof, and the turning movement causes the cutting angles α to come into contact with a reinforcing bar or the like for effective cutting. Is configured to. That is, as shown in FIG. 5, since the first to seventh rotary cutter bodies 31A to 31G having a diameter are pivotally moved around the shield axis O, for example, the shield axis O side is a plane perpendicular to the rotation axis. Then the cutting surface F perpendicular to the tangent line T
The cutting force is low because it abuts at an angle greater than 90 °. In order to solve this, a cutting angle α is formed in the direction in which the outer peripheral edge of each of the first to seventh rotary cutter bodies 31A to 31G becomes thinner toward the center side, and the cutting surface F has a cutting angle of 90 °.
It is configured to abut at an angle smaller than ° and to effectively cut the reinforcing bar.

As shown in FIGS. 6 to 9, the crushing cutter device 28 includes a pair of roller cutters 41A and 41B that are each movable in the radial direction, and a cutter moving device 43 that moves each of them in the radial direction. , A preceding hole excavating device 51 for forming a preceding hole H in a concrete structure C
It is composed of The roller cutter body 41A,
41B is a truncated cone shape and is rotatably supported about an axis parallel to the shield axis O, and is movably arranged along guide holes 42A and 42B formed in the radial direction on the front surface of the first spoke 21. Has been done. The preceding hole drilling device 5
1 is to form a preceding hole H in the concrete structure into which the roller cutter bodies 41A and 41B closest to the shield axis O are inserted, and from the earth and sand inlet 23 at the portion closest to the shield axis O. It is composed of a single core drill device 52 that projects forward of the cutter head 7.
Of course, two or four core drill devices may be provided on the same circumference.

That is, the roller cutters 41A and 41B
Has a pair of guide rails 44 arranged along the inner surfaces of the guide holes 42A, 42B of the second spokes 22, and is movable by being guided by these guide rails 44.
5 are provided respectively. The movable body 45 has a support shaft 46 protruding forward from the guide holes 42A and 42B.
The roller cutter bodies 41A and 41B are rotatably supported by the support shaft 46. Further, the cutter moving device 43 includes a pair of cutter moving cylinders 47A, 47 built in the second spokes 22.
B, each piston rod has the moving body 4
5 are connected to each other and moved.

In the core drill device 52, as shown in FIG. 8, a guide cylinder 53 is provided between the rear plate of the cutter head 7 and the rotary partition wall 5 so as to penetrate the pressure chamber.
A drill main body 54 is internally mounted in the unit 3 so as to be rotatable and slidable in the front-rear direction. Further, on the rear end side of the drill body 54, a base portion 55 having a guide groove 55a formed in the shield axis O direction is provided in the rotary partition wall 5,
The base end of the drill body 54 is supported by a slide base 56 slidably arranged in the guide groove 55a via a bearing 56a. A passive gear 57 is attached to the rear end side of the drill body 54, and a drive gear 59 rotated by a drill rotation motor 58 arranged on the slide base 56 is meshed with the passive gear 57. Further, the output shaft of the drill withdrawal jack 60 provided at the rear portion of the base 55 is connected to the slide base 56. Therefore, by rotating the drill body 54 via the gears 59 and 57 by the drill rotation motor 58 and further driving the drill withdrawal jack 60 to move the slide base 56 forward, the drill body 54 is moved from the guide cylinder 53. By projecting, a small-diameter hole h can be formed in the concrete structure. Next, after retracting the drill main body 54, the cutter head 7 is rotated by a predetermined angle to again form the small hole h in the existing small hole h continuously, and by repeating this, the crush hole H can be formed.

Therefore, after forming the crushing holes H, the roller cutter bodies 41A and 41B are brought close to the shield axis O, and the shield machine is moved forward to advance the roller cutter body 4
1A and 41B are inserted into the preceding holes H, and the cutter moving cylinders 47A and 47B are respectively advanced while the cutter head 7 is being rotated, whereby the roller cutter main body 41
With A and 41B, the concrete structure around the preceding hole H can be crushed and gradually expanded to form a large diameter hole having a diameter slightly larger than that of the cutter head 7. In the case of not penetrating once, the above work may be repeated a plurality of times.
In this way, since the roller cutter bodies 41A and 41B are moved outward in the radial direction to enlarge the preceding hole H, the pressing force for pressing the cutter head 7 against the concrete structure by the shield machine can be minimized. Therefore, there is no adverse effect on the segment 18, which receives the reaction force of the shield machine, or extensive destruction of the area around the preceding hole of the concrete structure.

In the above structure, for example, when the tunnel segment is connected to the existing segment, when the shield machine comes close to the existing segment and is stopped, the core drill device 52 first forms a large number of small holes h in a circular shape. Then, the leading hole H is formed, and then the shield machine is advanced to insert the roller cutter body 41 into the leading hole H.
While inserting A and 41B, the first to third cutter rotating motors 32A to 32C are activated to rotate the first to seventh rotating cutter bodies 31A to 31G at high speed.
Then, the cutter head 7 is rotated to advance the cutter moving cylinders 47A and 47B, respectively, and the roller cutter bodies 41A and 41B are moved to the outer diameter side. As a result, the reinforcing bars embedded in the concrete structure are cut to a predetermined length by the first to seventh rotary cutter bodies 31A to 31G, and the concrete is crushed by the roller cutter bodies 41A and 41B to gradually form the preceding hole H. Enlarge and form a large hole through which the shield machine can pass. Further, this is repeated to form a through hole in the existing segment. After the through hole is formed, the cutter head 7 and internal equipment are disassembled and carried out, a segment is assembled in the shield body 1, and a new segment is connected to the existing segment.

When the shield machine is started from the starting shaft or when the shield machine is docked to the reaching shaft, the reinforced concrete part provided at the starting part or the reaching part of the shaft is excavated in the same manner as above. Good.

Further, when the PC pile or the like is buried, excavation is continued and the first to seventh rotary cutter bodies 31A to
It is sufficient to rotate 31G at a high speed and to crush the PC pile and the like by the cutting cutter device 27 and the crushing cutter device 28 without using the preceding hole excavating device 51 to move forward.

[0027]

As described above, according to the present invention, the ground is excavated by the excavating cutter, and for the concrete structure, the rebar embedded in the concrete is cut and crushed by the cutting cutter device. Since the concrete is crushed and destroyed by the cutter device for use, the reinforced concrete structure can be surely destroyed and penetrated only in the required area, and it is not necessary to perform the large-scale auxiliary construction method which has been conventionally required. Therefore, the construction period and cost can be significantly reduced.

Further, since the cutting body of the cutting cutter device is rotated at a high speed, it is possible to surely cut the reinforcing bar embedded in the concrete. Further, by forming a cutting angle on the outer peripheral portion of the cutting main body that swivels along with the swiveling of the cutter head, it is possible to effectively cut rebar and the like.

Further, the crushing cutter device positioned on the shield shaft center side is inserted into the preceding hole formed in the concrete structure, and the crushing cutter device is moved to the outer peripheral side while turning the cutter head. Thus, the leading hole can be gradually expanded to form a leading hole having a diameter corresponding to the cutter head. Therefore, only a small-scale auxiliary construction method is required to form a small-diameter leading hole in the concrete structure to be destroyed, and the pressing force of the cutter head against the concrete structure by the shield machine is sufficient. As a result, the construction period and cost can be significantly reduced, and the segment that receives the reaction force and the concrete structure to be crushed will not be adversely affected, and the crushed section will not expand more than necessary.

In addition, the preceding hole excavating device completely eliminates the need for an auxiliary construction method for forming an existing tunnel segment to be connected, a preceding hole from the reaching shaft side, or a preceding hole from the shield machine side, so that the concrete structure can be safely and efficiently constructed. Can crush objects.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a cutter head for excavating a concrete structure according to the present invention.

FIG. 2 is a front view showing the cutter head.

FIG. 3 is a sectional view taken along line AA shown in FIG. 1;

FIG. 4 is an enlarged view showing a rotary cutter body of the cutter head.

FIG. 5 is an explanatory view showing a cutting angle of a rotary cutter body of the cutter head.

6 is a sectional view taken along line BB shown in FIG.

FIG. 7 is a transverse cross-sectional view showing second spokes of the cutter head.

FIG. 8 is a side sectional view showing a preceding hole excavating device of the cutter head.

FIG. 9 is an explanatory diagram showing an excavation state of an excavation hole by the preceding hole excavation device of the cutter head.

[Explanation of symbols]

 1 Shield Main Body 7 Cutter Head 13 Turning Device 21 First Spoke 22 Second Spoke 23 Sediment Intake 24 Cutter Face Plate 25 Excavation Cutter 26 Center Bit 27 Cutting Cutter Device 28 Crushing Cutter Device 31A to 31G 1st to 7th Rotations Cutter main body 32A-32C 1st-3rd cutter rotation motor 41A, 41B Roller cutter main body 43 Cutter moving device 47A, 47B Cutter moving cylinder 51 Lead hole drilling device 52 Core drill device O Shield shaft center H Lead hole h Small diameter hole α cutting Horn

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuto Hamada 2-8 Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Inventor Koji Sasayama, Nishikujo 5-5, Konohana-ku, Osaka City, Osaka Prefecture No. 28 in Hitachi Shipbuilding Co., Ltd.

Claims (5)

[Claims] 1. A cutter head for excavating a concrete structure, which is rotatably supported by a front portion of a shield main body, and has a cutter for excavating the ground and a sediment intake, and a reinforcing bar is cut in front of the cutter head. A cutter head for excavating a concrete structure, comprising a cutting device capable of cutting and a crushing device capable of crushing concrete. 2. A cutting cutter device, wherein a plurality of disc-shaped rotary cutter bodies are rotatably arranged around an axis in a direction intersecting a shield axis, and an outer peripheral portion of the rotary cutter body. 2. A cutter head for excavating a concrete structure according to claim 1, further comprising a cutter rotating device for embedding a hard cutting material in each of them, and further for rotating each of these main bodies at a high speed. 3. The cutter head for excavating a concrete structure according to claim 2, wherein a cutting angle is formed on at least a side surface of the rotary cutter body on a side of the shield shaft center side. 4. A crushing cutter device comprises a plurality of roller cutter bodies rotatably supported around an axis in the front-rear direction, and a cutter moving device for moving these cutter bodies from the shield axis side to the outer circumference side. The roller cutter body is fitted into the preceding hole formed in the concrete structure corresponding to the shield shaft center portion, and the roller moving body is moved to the outer peripheral side by the cutter moving device to expand the preceding hole. The cutter head for excavating a concrete structure according to any one of claims 1 to 3, wherein the cutter head is for excavating a concrete structure. 5. The crushing cutter device is provided with a preceding hole excavating device for excavating a preceding hole having an outer diameter larger than the turning outer diameter of the roller cutter body moved to the shield shaft center side. The cutter head for excavating a concrete structure according to claim 4, wherein the cutter head is constituted by a single or a plurality of core drill devices that can move forward and backward from the cutter head.