JP3547119B2 - Cutter bit changer for shield machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutter bit changing device for a shield machine.
[0002]
[Prior art]
When the long-distance shield tunnel was constructed, the cutter bits were worn. Therefore, a vertical shaft for inspection or a ground improvement zone was provided on the way, and the cutter bits were replaced by self-standing.
As shown in FIGS. 14 and 15, when the cutter bit A11 wears out, the worker AM passes through a hollow shaft A3 provided at the center of the shield machine A1 to cut a spoke. A method has been proposed in which the cutter bit A11 is replaced by using a jack for pulling out the cutter bit, stopping the water with the water stop valve A14, and using a jack for pulling out the cutter bit. In the drawing, reference numeral A2 denotes a cutter face, A13 denotes a water stop seal, and A12 denotes a bit mounting bolt. This method is superior in terms of safety and cost as compared with the means for constructing the shaft or ground improvement zone.
[0003]
However, the cost of the cutter bit exchanging device including the permanent water stop valve A14 and the workability of the cutter bit exchanging are not always good, and there is room for improvement.
[0004]
The present invention is to provide a cutter bit exchanging apparatus based on a subsequent research result of the present applicant regarding the cutter bit exchanging.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above, and an object of the present invention is to provide a cutter bit exchanging device for a shield machine capable of exchanging cutter bits safely and with good workability within a cut-spoke of the shield machine.
[0006]
[Means for Solving the Problems]
According to an embodiment of a cutter bit exchanging device for a shield machine according to the present invention, in a cutter bit exchanging device for exchanging a cutter bit attached to a cut-spoke of a shield machine, a cutter bit fixed to the cut-spoke and excavating the ground. And a cutter bit detaching device for detaching, attaching and replacing the cutter bit, wherein the cutter bit assembly comprises a cylindrical cutter bit shaft holder with a flange fixed to the cutter spoke, and the cutter bit shaft. A cutter bit shaft in which a cutter bit slidably held in an inner hole of the holding member and a shaft portion are detachably fastened, and a cutter bit shaft screwed to an end of the cutter bit shaft holding member and front and rear of the cutter bit shaft. And a fixing plate for fixing the rotational direction position to a predetermined position, wherein the cutter bit attaching / detaching device is formed in a cylindrical shape with a flange. A bracket with a gate having an inner hole having the same diameter as the inner hole of the cutter bit shaft holder, and having a gate for closing the inner hole; and a front end portion which can be fastened to a rear end portion of the cutter bit shaft. When the cutter bit is replaced, the fixing plate is removed, the bracket with the gate is fastened, and the cutter bit shaft is pulled out by operating the jack.
[0007]
With the cutter bit exchanging device of the shield machine, an operator removes the old cutter bit shaft worn in the cutter spoke into the inside of the spoke by the jack of the cutter bit attaching / detaching device, and replaces it with a new cutter bit. When pulling out the cutter bit shaft, muddy water and soil are blocked by the gate provided on the bracket with gate. Therefore, only the cutter bit can be easily replaced safely. Further, since the cutter bit alone is small, it is easy to carry the new cutter bit into the cutter spoke and carry out the old cutter bit.
[0008]
If a cutter bit in which a cutter bit and a shaft part are integrally formed is used instead of the cutter bit shaft, manufacturing cost is low and the cutter bit can be easily exchanged in the cut spoke.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a cutter bit exchange device 1 of a shield machine of the present invention will be described with reference to the drawings. In FIG. 1, a cutter bit exchanging device 1 is a cutter bit assembly 2 fixed to a cut-spoke A10 and excavates the ground, and a cutter bit attaching / detaching device (hereinafter referred to as a cutter bit attaching / detaching device) for exchanging and attaching a cutter bit 12A in the cutter bit assembly 2 during exchange. , A bit attaching / detaching device).
[0010]
The cutter bit assembly 2 includes a cutter bit shaft holder (hereinafter, abbreviated as a bit shaft holder) 3 fixed to the cut-spoke A10 and a bit shaft holder 3 with reference to FIGS. A cutter bit shaft 12 slidably held has a main configuration.
[0011]
The bit shaft holder 3 is formed by fixing a flange 3b to an end of a cylindrical body 3a, and an inner hole 3d is slidably fitted with a shaft portion 12B of the cutter bit shaft 12 so as to be free to slide. A pin hole 3e for fixing 12B with the pin 4 is formed. The flange 3b is provided with a plurality of through tap holes 3c into which a fixing plate 14 described later is screwed. The inner hole 3d is provided with a seal groove 16 at the front and rear ends of which a seal is mounted.
[0012]
The cutter bit shaft 12 includes a cutter bit 12A and a shaft portion 12B, and is fitted with a concave portion 12Ai formed on the back of the large end portion of the cutter bit 12A and a convex portion 12Bo formed on the front end of the shaft portion 12B. And are fastened by a plurality of bolts 12Ab. The pin 4 is fitted into the central rear portion of the shaft portion 12B, and the cutter bit shaft is not moved particularly when the cutter bit is replaced when the fixing plate 14 is removed. At the rear end, a square seat 12Bc for determining a mounting position of the cutter bit 12A in the rotation direction is formed to protrude. The square seat 12Bc is provided with a tap hole (not shown), and is formed so as to be fastened to the jack 20 to be attached when the cutter bit 12A is detached and attached. Further, a plurality of tap holes 12d for fixing the fixing plate 14 are provided at the rear end of the shaft portion 12B.
[0013]
At the rear end of the bit shaft holder 3 and the cutter bit shaft 12, a fixing plate 14 for fixing the bit shaft holder 3 and the cutter bit shaft 12 includes a plurality of bolts 14b and bolt holes 14c and a plurality of bolts 14d and bolt holes. 14e. A square hole 14a is formed in the center of the fixing plate, and is formed so as to fit with the square seat 12Bc of the cutter bit shaft 12. The fixed plate 14 is in a fixed state during the operation of the shield machine A1, and is configured to be removed only when the cutter bit 12A is detached or attached.
[0014]
The bit attaching / detaching device 7 to be attached when detaching and attaching the cutter bit 12A is a bracket 17 with a gate having a function of guiding the cutter bit shaft 12 into the cut-spoke A10 when replacing the cutter bit 12A and stopping water. And a jack 20. The bracket 17 with a gate is formed in a cylindrical shape having a flange 18 at an end, and the inner hole 17a is formed to have the same diameter as the inner hole 3d of the bit shaft holder 3. A water stop gate 19 is built in near the front end of the inner hole 17a. A bolt hole is provided in the flange 18 and formed to be fastened by a bolt 18a.
The jack 20 is provided with puller portions 21 and 22 composed of a jaw 21a and a puller bolt 21b at front and rear ends, and a puller portion 22 at a rear end is fixed to the shaft portion 12B so that the puller portion 21 at the front end is fastened to the shaft portion 12B. The cutter spoke A10 is configured to be tightened to the rear wall.
[0015]
The method of exchanging the cutter bit 12A by the cutter bit exchanging apparatus 1 having the above-described configuration will be described with reference to the above drawings, FIGS. 5 and 6 showing the muddy water pressurized shield machine A1 and the cut-spoke A10, and FIGS. This will be described with reference to FIG.
First, the worker AM enters the cutter spoke A10 together with the bit attaching / detaching device 7 (see FIG. 6), and prepares for the replacement work of the cutter bit 12A. Then, the operation for the cutter bit assembly 2 shown in FIG. 2 is started.
[0016]
FIG. 7 shows the first step. That is, the fixing plate 14 is removed from the bit holder 3 and the cutter bit shaft 12 by removing the bolts 14c and 14d.
[0017]
FIG. 8 shows the second step. The prepared bracket 17 with a gate is attached to the rear end of the bit shaft holder 3 with a bolt 18a. The bolt 18a is used if the bolt 14c removed in the previous step is appropriate.
[0018]
FIG. 9 shows the third step. The prepared puller portion 21 of the jack 20 passes through the bracket 17 with the gate and is attached to the rear end of the cutter bit shaft 12. Further, the puller portion 22 is tightened to the rear portion of the cut-spoke A10, and then the pin 4 is pulled out so that the cutter bit shaft 12 can be pulled out.
[0019]
FIG. 10 shows the fourth step. The jack 20 is contracted, and the cutter bit shaft 12 is pulled out into the cut-spoke A10. The cutter bit shaft 12 is pulled out by sliding through the inner hole 3b of the bit holder 3 and the inner hole 17a of the bracket 17 with the gate.
[0020]
FIG. 11 shows the fifth step. The cutter bit shaft 12 is pulled out into the cut-spoke A10, and the gate 19 shuts off the inner hole 17a to stop water. Next, the cutter bit shaft 12 is removed from the jack 20. Further, the cutter bit 12A is detached from the shaft portion 12B, and is replaced with a prepared new cutter bit 12A.
Next, the fifth to first steps are reversed to restore the cutter bit assembly 2 to the initial, predetermined state shown in FIG.
[0021]
A side cross section of FIG. 12 and an arrow A of FIG. 13 show a cutter bit 32 of another embodiment, in which the cutter bit 12A and the shaft portion 12B of the above embodiment are integrally formed. There is an advantage in that the replacement process is easy and the cost is low, and the replacement process does not include the removal process of the cutter bit 12A of the above-described embodiment, so that the time for the replacement site can be reduced.
[0022]
【The invention's effect】
The effects of the present invention are listed below.
(1) According to the cutter bit exchanging device of the shield machine according to the present invention, the cutter bit exchanging device allows the worker to remove the old cutter bit shaft worn in the cut-spokes into the spokes by the jack of the detaching device, thereby obtaining a new cutter. Replace with a bit. When pulling out the cutter bit shaft, muddy water and soil are blocked by the gate provided on the bracket with gate. Therefore, only the cutter bit can be easily replaced safely. The cost is lower than that of a conventional water shutoff valve that is permanently installed in a cut-spoke, and the cutter bit itself is small, so that a new cutter bit can be carried into the cut-spoke and an old cutter bit can be easily carried out.
(2) If a cutter bit in which a cutter bit and a shaft portion are integrally formed is used instead of the cutter bit shaft, manufacturing cost is low, and replacement work is easy.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a cutter bit changing device of a shield machine of the present invention.
FIG. 2 is a side sectional view showing a cutter bit assembly used in FIG. 1;
FIG. 3 is a front view taken in the direction of arrow A in FIG. 2;
FIG. 4 is a view as seen from the back B of FIG. 2;
FIG. 5 is a front view of a shield machine equipped with a cutter assembly of the cutter bit exchanging apparatus of the present invention.
FIG. 6 is a side sectional view of FIG. 5;
FIG. 7 is an explanatory view showing a first step of a cutter bit replacement method by the cutter bit replacement device of the present invention.
FIG. 8 is an explanatory view showing a second step of the above.
FIG. 9 is an explanatory view showing a third step of the above.
FIG. 10 is an explanatory view showing a fourth step of the above.
FIG. 11 is an explanatory view showing a fifth step of the above.
FIG. 12 is a side sectional view showing another embodiment of the cutter bit assembly.
FIG. 13 is a view taken in the direction of the arrow A in FIG. 12;
FIG. 14 is a side sectional view of a shield machine showing a conventional cutter bit replacement procedure.
FIG. 15 is a top view showing a conventional cutter bit mounting.
[Explanation of symbols]
A1 Shield machine A10 Cut-spoke 1 Cutter bit exchange device 2 Cutter bit assembly 3 Bit shaft holder 4 Pin 7 Bit removal device 8 Gate With bracket 12, cutter bit shaft 12A, cutter bit 12B, shaft part 14, fixing plate 17, bracket 19 with gate, gate 20, jack 21, 22, puller part

Claims (1)

In a cutter bit exchanging device for exchanging a cutter bit mounted on a cut-spoke of a shield machine, a cutter-bit assembly fixed to the cut-spoke and excavating the ground, and a cutter-bit detaching device for detaching, attaching, and replacing the cutter bit. The cutter bit assembly comprises a cylindrical cutter bit shaft holder with a flange fixed to the cutter spoke, and a cutter bit slidably held in an inner hole of the cutter bit shaft holder. A cutter bit shaft, which is detachably fastened to the cutter bit shaft, and a fixing plate which is screwed to an end of the cutter bit shaft holder and fixes the front and rear and rotation direction positions of the cutter bit shaft at predetermined positions, The cutter bit attachment / detachment device has an inner hole formed in a cylindrical shape with a flange and having the same diameter as an inner hole of the cutter bit shaft holder. It consists of a bracket with a gate with a gate to be closed, and a jack with a puller at the front end that can be fastened to the rear end of the cutter bit shaft.When replacing the cutter bit, remove the fixing plate and attach the gate. A cutter bit exchanging device for a shield machine, wherein the cutter bit shaft is drawn out by fastening a bracket and operating a jack.

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