JP3775702B2 - Drain material cutting device for shield machine and blade cutter replacement method for drain material cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine, and more particularly to a drain material cutting device of a shield machine and a blade cutter exchanging method of the drain material cutting device for cutting the underground material when excavating in an area where the drain material is buried. is there.
[0002]
[Prior art]
FIG. 7 is an overall configuration diagram of a conventional shield machine, which includes a shield main body 21 having a partition wall 11, a cutter head 8, a screw conveyor 22, a jack 23, and the like, and the cutter head 8 is rotated by a cutter driving device 24. The face 7 is cut by a bit 25 attached thereto, and the cut earth and sand are filled between the partition wall 11 and the cutter head 8 through a gap provided in the cutter head 8 and introduced into the apparatus by a screw conveyor 22. Then, it is carried out through the tunnel, and in parallel, the segment 26 is assembled at the tail portion of the shield machine 10, and the end surface of the segment 26 is pushed backward by the jack 23 to advance the shield machine 10. In this figure, reference numeral 27 denotes a soil pressure gauge, which adjusts the cutter head 8, screw conveyor 22, jack 23, etc., so that the shield machine can keep the earth pressure between the partition wall 11 and the cutter head 8 substantially constant. 10 is driven.
[0003]
In the shield machine 10 described above, it is generally difficult to move backward, and it is also difficult to replace the bit 25 attached to the cutter head 8. For this reason, the route of shield construction is determined through careful planning and investigation so that stable excavation can be performed with the normal bit 25. However, in coastal industrial areas, etc., drain materials made of synthetic fibers are buried in order to improve the soft ground into stable ground, and there are areas where this drain material is buried in the planned route for shield construction. May be included. In general, this drain material is embedded in the ground surface so that one end protrudes, shrinks while forming a corrugated shape in conformity with the ground subsidence, and continues drainage using the capillary phenomenon from the protruding portion It is. If you try to cut such drain material with a conventional bit for earth and sand cutting, there is a risk that the drain material will be entangled with the bit and continuous excavation will not be possible, or the drain material will be pulled out and the ground will be destroyed. there were. Therefore, “shield shield machine equipped with a cutting device for drain material” (Japanese Patent Laid-Open No. 7-4180), “shield shield machine equipped with a cutting device for drain material” (Japanese Patent Laid-Open No. 7-4181), etc. Proposed.
[0004]
FIG. 8 shows a diagram of a “shielding machine equipped with a cutting device for drainage material” proposed in Japanese Patent Laid-Open No. 7-4180. The shield machine shown in FIG. 8 has a “blade mounting body 29 in which a cutting blade 28 is rotatably attached to a cutter head 8 disposed in front of the shield machine 10 so as to be able to turn upside down. An opening is provided in the partition wall 11 fixed to the front side of the shield machine 10 at a certain distance from the cutter head 8 behind the head 8, and the cutting blade replacement chamber 30 can be slid forward and backward in the opening. The gate plate 31 is provided on the front surface of the cutting blade replacement chamber 30 so as to be freely opened, and the gate plate 31 is configured to be in close contact with the surface of the blade mounting body 29. Is a shield machine equipped with a cutting device for drain material or the like, wherein the cut-off plate 32 is detachably provided.
[0005]
[Problems to be solved by the invention]
However, in such a shield machine equipped with a cutting device such as a drain material, a gate plate provided in the front of the cutting blade exchange chamber is freely opened and sealed in close contact with the surface of the blade mounting body. Yes. Therefore, if mud is attached to the blade mounting body, or if there is a scratch on the blade mounting body, the sealing performance will be reduced and dirt will enter the cutting blade replacement chamber for smooth cutting. There was a problem that the blade (equivalent to the blade cutter of the present invention) could not be replaced.
[0006]
The present invention has been developed to solve the above-described problems. That is, it is possible to provide a shield material excavator drain material cutting device and a drain material cutting device blade cutter exchanging method that can excavate while cutting the drain material and can smoothly exchange the blade cutter. With the goal.
[0007]
[Means for Solving the Problems]
According to the present invention, the blade cutter is supported so as to be able to protrude and retract from an opening provided in the vicinity of the edge of the front surface of the cutter head that rotates against the face and rotates about the substantially radial direction of the cutter head in a protruding state. A blade cutter case that is a cylindrical member that is fixed to the cutter head and extends from the opening to the inside of the shield machine, and slides in the blade cutter case in the front-rear direction, and the blade cutter is an abbreviation of the cutter head. A blade cutter support member that rotatably supports from a state of rotating about the radial direction to a state of being able to pass through the opening, and a maintenance that is fitted into the partition wall of the shield machine and is slidable in the front-rear direction. A hole and a rear portion of the maintenance hole, extending and contracting through the inside of the maintenance hole, the blade cutter A replacement jack accommodated in Maintenance holes, and knife gate for opening and closing the opening, made of, drain material cutting device of the shield machine is provided, characterized in that.
[0008]
According to the configuration of the present invention described above, the blade cutter can be rotated about the substantially radial direction of the cutter head as an axis during work to cut the drain material, and when replacing the blade cutter, the blade cutter is accommodated in the maintenance hole. The blade cutter can be replaced.
[0009]
According to an embodiment of the present invention, the replacement jack includes a piston rod fixed to the shield machine side, a cylinder tube fitted to the piston rod and having a keyway in the outer surface axial direction, A large gear having a sliding key fitted inside the key groove of the cylinder tube and a small gear provided on the shield machine side so as to mesh with the large gear, and in the cylinder tube It is preferable that hydraulic pressure is supplied to slide the cylinder tube along the piston rod, rotate the small gear, and rotate the cylinder tube around the piston rod.
[0010]
According to the configuration of the above-described embodiment of the present invention, the cylinder tube can be slid along the piston rod and rotated around the piston rod as an axis. Therefore, the blade cutter can be rotated from the state of rotating about the substantially radial direction of the cutter head to the state of being able to pass through the opening, and the blade cutter can be accommodated in the maintenance hole.
[0011]
Furthermore, according to the present invention, the maintenance hole inserted into the partition wall of the shield machine is slid to the front side, and the blade extends into the shield machine from the opening provided near the edge of the front surface of the cutter head. A first step of connecting to the rear end surface of the cutter case, a second step of rotating the blade cutter to a state in which the blade cutter can pass through the opening by an exchange jack provided at the rear of the maintenance hole, and the second step. The blade cutter rotated in step 3 is housed in the blade cutter case, the third step of sealing the opening with a knife gate, and the replacement jack is further shrunk so that the blade cutter is placed in the maintenance hole. A fourth step of accommodating the blade cutter in the maintenance hole, and replacing the blade cutter in the maintenance hole. Blade cutter replacing drain material cutting apparatus according to claim is provided.
[0012]
According to the present invention described above, the blade cutter that cuts the drain material by rotating about the substantially radial direction of the cutter head during operation is rotated to a state where it can pass through the opening of the cutter head, and the inside of the blade cutter case is rotated. Passes through and accommodates in the maintenance hole, and the opening is sealed by a knife gate, so that when replacing the blade cutter, muddy water does not enter the maintenance hole and the blade cutter can be replaced smoothly. it can.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part which is common in the past, and the overlapping description is abbreviate | omitted.
FIG. 1 is a front view of a shield machine having a drain material cutting device for a shield machine according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. FIG. 4B is a cross-sectional view taken along the line C-C in FIG. 2, and (C) is a cross-sectional view taken along the line C-C in FIG. 2. The traveling direction of the shield machine will be described as the front-rear direction (that is, the front of the shield machine is forward and the rear of the shield machine is rear).
[0014]
As shown in these drawings, the drain material cutting device of the present invention is supported and protruded from an opening 9 provided in a recess 8a at the edge of the front surface of the cutter head 8 that rotates against the face. Blade cutter 1 that rotates about the substantially radial direction of the cutter head 8 in the state, a blade cutter case 2 that is fixed to the cutter head 8 and extends from the opening 9 into the shield machine 10, and the blade A state in which the blade cutter 1 slides in the front-rear direction within the cutter case 2 and can pass through the opening 9 from the state in which the blade cutter 1 rotates about the substantially radial direction of the cutter head 8 (the state shown by the solid line in FIG. 1). A maintenance cutter that is fitted in the blade cutter support member 3 that is rotatably supported to the state (shown by a broken line) and the partition wall 11 of the shield machine 10 and is slidable in the front-rear direction. 4, a replacement jack 5 provided in the rear part of the maintenance hole 4, extending and contracting through the maintenance hole 4 and accommodating the blade cutter 1 in the maintenance hole 4, and a knife gate 6 for opening and closing the opening 9 , Is composed of. During operation, the blade cutter 1 is rotated about the substantially radial direction of the cutter head 8 to cut the drain material. When the blade cutter 1 is replaced, the blade cutter 1 is accommodated in the maintenance hole 4 and the blade cutter 1 is replaced. It is supposed to be. In FIG. 1, the cutter head 8 includes a main bit 33 that cuts the face, a leading bit 34 that precedes the main bit 33, a blade cutter protection bit 35 that protects the blade cutter 1 from the face, and earth and sand inside. A slit 36 that can be opened and closed is provided, but is not limited to such a cutter head 8.
[0015]
The blade cutter 1 includes a blade 1a that cuts a drain material made of synthetic fiber and the like, and a body 1b that incorporates a motor (not shown) that rotationally drives the blade 1a. Although this blade 1a is not particularly illustrated, for example, a blade in which a plurality of tungsten chips are fixed on the circumference of a metal disk can be used, and the drain material can be easily cut. . As shown in FIG. 2, the blade 1 a of the blade cutter 1 cuts the drain material ahead of the preceding bit 34 of the cutter head 8. The leading bit 34 assists the blade cutter 1 by reliably cutting the uncut portion of the blade cutter 1 and the like. As shown in FIG. 1, the blade cutter 1 is supported so as to be tilted slightly rearward in the rotational direction from the radial direction of the cutter head 8 so that the blade cutter 1 can be stably operated.
[0016]
As shown in FIG. 2, the blade cutter case 2 is a cylindrical member that is inserted in close contact with the opening 9 of the cutter head 8 and fixed to the cutter head 8. A blade cutter support member 3 that slides in the front-rear direction is inserted into the blade cutter case 2, and a spacer 37 is connected to the rear portion of the blade cutter support member 3. The spacer 37 is provided by pulling out the blade cutter 1 in two stages in order to shorten the length of the maintenance hole 4 in the front-rear direction and the length of the stroke of the replacement jack 5. Therefore, when there is sufficient space, the blade cutter support member 3 may be formed in a shape integrated with the spacer 37 and pulled out in one step. Further, the rear end surface of the blade cutter case 2 is formed with a flange portion 2f that forms a mating surface with the rear maintenance hole 4, and the lid 2c of the blade cutter case 2 is located on the inner side (front side) of the flange portion 2f. Is detachably provided. A spacer 37 passes through the lid 2c, and the rear portion of the spacer 37 is fixed to the lid 2c from the outside of the blade cutter case 2. Further, a key hole 39 is provided on the rear end surface of the spacer 37 so that the tip end portion 38 of the replacement jack 5 can be coupled, and a spacer plate 40 is covered to protect the key hole 39 from earth and sand. , Fixed to the lid 2c. A so-called twist lock is used for coupling the spacer 37 and the exchange jack 5, and the tip end portion 38 of the exchange jack 5 is composed of a shaft 38 r and a pin 38 p connected perpendicularly to the shaft 38 r. Accordingly, as shown in FIG. 3A, the key hole 39 is engaged with a hole 39a that penetrates in the front-rear direction so that the distal end portion 38 can be inserted, and the pin 38p of the distal end portion 38 by rotating the replacement jack 5. And a groove 39b provided in the rear end face that can be stopped. Further, in the space of the portion where the spacer 37 of the blade cutter case 2 is not inserted, a pipe (not shown) for passing hydraulic pressure to the motor of the blade cutter 1 through the inside of the blade cutter support member 3 is provided. It has been. The lid 2c of the blade cutter case 2 is provided with an opening for operating the piping (not shown) when the blade cutter 1 is replaced. The lid 41 shown in FIG. The opening is closed. In FIG. 3A, bolts for fixing the spacer plate 40 and the spacer 37 are omitted.
[0017]
As shown in FIG. 2, the blade cutter support member 3 is provided in close contact with the blade cutter case 2 and slides in the front-rear direction, and is supported by penetrating through the long-cylinder bearing 3a. And a center shaft 3b that rotates about the axis. The blade cutter 1 is fixed and supported on the center shaft 3b, the blade cutter 1 is rotated by the rotation of the center shaft 3b, and the blade cutter 1 is drawn into the inside by the sliding of the long cylindrical bearing 3a. . The long cylindrical bearing 3a and the center shaft 3b have a hollow inside, and a long hole 3c is provided in a part of the outer wall of the center shaft 3b. A portion of the long cylindrical bearing 3a where the center shaft 3b is not inserted is provided with a mud vent valve (not shown) that communicates with both end surfaces of the long cylindrical bearing 3a, and the inside of the center shaft 3b from the long hole 3c. A pipe or the like (not shown) that passes through and connects to a motor (not shown) of the blade cutter 1 is provided. A key hole 42 is provided on the rear end surface of the center shaft 3b so that the front end portion 38 of the replacement jack 5 can be coupled. In this connection, a so-called twist lock is used, and the structure of the key hole 42 is the same as the key hole 39 of the spacer 37.
[0018]
One maintenance hole 4 is basically provided for the shield machine 10. Therefore, when a plurality of blade cutters 1 are provided, the blade cutters 1 are replaced one by one in order. Of course, when there is a space, a plurality of maintenance holes 4 may be provided. As shown in FIG. 2, the maintenance hole 4 includes a fixed portion 4a fixed to the partition wall 11 of the shield machine 10 and a sliding portion 4b that slides in the front-rear direction inside the fixed portion 4a. Has been. 2 and 3B, the fixed portion 4a is a cylindrical member having a substantially rectangular shape, and the sliding portion 4b is also a cylindrical member having a substantially rectangular shape like the fixed portion 4a. Is blocked. On the front surface of the sliding portion 4b, a seal member 43 that contacts the flange portion 2f on the rear end surface of the blade cutter case 2 is provided. The seal member 43 is not particularly shown, but a lip type seal and a tube type seal formed in two stages in the front and rear are used. A hatch cover 4 c of the maintenance hole 4 is provided in a portion surrounded by the seal member 43. Further, as shown in FIG. 3B, screw jacks 44 are connected to both side surfaces of the sliding portion 4b through openings provided on both side surfaces of the fixed portion 4a. It is connected to a screw jack motor 45 supported by the fixed portion 4a via a shaft or the like. By driving the screw jack motor 45 to operate the screw jack 44, the sliding portion 4b slides back and forth within the fixed portion 4a. In FIG. 2, the screw jack 44 and the screw jack motor 45 are omitted, and 46 in the figure is a table lifter.
[0019]
The exchange jack 5 includes a piston rod 13 fixed to the shield machine 10 side, a cylinder tube 14 fitted to the piston rod 13 and having a key groove 14k in the outer surface axial direction, and a key of the cylinder tube 14 A large gear 15 having a sliding key 15k fitted inside the groove 14k and a small gear 16 provided on the shield machine 10 side so as to mesh with the large gear 15 are configured. The piston rod 13 is supported by a piston rod support member 47, and the cylinder tube 14 is slidably supported by a cylinder tube support member 48. As shown in FIG. 3C, the cylinder tube support member 48 is also used as a gear box that houses the large gear 15 and the small gear 16, and the motor 16 m that rotates the small gear 16 and the cylinder tube 14 A pipe (not shown) for supplying hydraulic pressure to the pipe is also accommodated. The cylinder tube support member 48 may be provided with an encoder (not shown) for detecting the rotation angle of the cylinder tube 14.
[0020]
As shown in FIG. 2, the knife gate 6 includes a gate cover 6a that is a plate-shaped member having an opening through which the long cylindrical bearing 3a of the blade cutter support member 3 can pass and a groove therein, and a groove in the gate cover 6a. , And a gate main body 6b that seals the opening. The knife gate 6 is provided on the front surface of the blade cutter case 2 in the opening 9, and a cylinder (not shown) for sliding the gate body 6 b is provided on the cutter head 8.
[0021]
FIG. 4 is a view showing a working state of the shield machine having the drain material cutting device of the shield machine of the present invention. According to the shield machine 10 described above, the drain material 12 can be cut by the blade cutter 1 that is the most advanced, and the face 7 can be cut by the main bit 33. When the drain material 12 is not completely cut, it can be completely cut by the preceding bit 34 preceding the main bit 33. When the drain material 12 is further cut long, The leading bit 34 can also be cut finely. The cut drain material 12 flows into the machine from the slit 36 together with earth and sand, and is carried out to the outside by the screw conveyor 22.
[0022]
FIG. 5 is a view showing a blade cutter replacement method of the drain material cutting device of the present invention, where (A) is the first step, (B) is the second step, (C) is the third step, (D ) Shows the fourth step.
[0023]
First, when the blade cutter 1 is replaced by the blade cutter replacement method of the drain material cutting device of the present invention, as shown in FIG. 2, the cutter head is set so that the blade cutter case 2 and the maintenance hole 4 are substantially coaxial. 8 is stopped. From this state, through the following steps, the blade cutter 1 described above is accommodated in the maintenance hole 4 and the blade cutter 1 is replaced.
[0024]
(1) The first step is a step of sliding the maintenance hole 4 described above to the front side and connecting it to the rear end surface of the blade cutter case 2 described above, as shown in FIG. That is, it is a step of fixing the seal member 43 of the maintenance hole 4 in close contact with the flange portion 2 f of the blade cutter case 2. This step is necessary because the blade cutter case 2 and the maintenance hole 4 are separated. The blade cutter case 2 and the maintenance hole 4 are separated from each other because the blade cutter case 2 needs to rotate together with the cutter head 8 during operation. In this process, since the pressure in the gap between the maintenance hole 4 and the blade cutter case 2 increases, a pressure relief valve (not shown) is provided in the hatch cover 4c of the maintenance hole 4, and this pressure relief valve is provided. By releasing the pressure, the pressure is released to the inside of the aircraft. Further, a large amount of muddy water is present in the gap, and it is necessary to remove the muddy water in order to proceed smoothly. The muddy water is discharged and removed to the inside of the machine through a hose or the like by opening a muddy water relief valve (not shown) provided in the hatch cover 4c.
[0025]
(2) The second step is a step of rotating the blade cutter 1 to a state where the blade cutter 1 can pass through the opening 9 by the above-described replacement jack 5 as shown in FIG. In this process, the hatch cover 4c of the maintenance hole 4 is opened, the spacer plate 40 fixed to the lid 2c of the blade cutter case 2 and the lid 41 shown in FIG. 3 are removed, and the replacement jack 5 is placed inside the maintenance hole 4. The tip end portion 38 of the exchange jack 5 is coupled to the key hole 39 of the spacer 37. When the replacement jack 5 is rotated, the spacer 37, the center shaft 3b, and the blade cutter 1 are rotated together. When rotated about 90 °, the blade cutter 1 can be rotated to a state where it can pass through the opening 9 (see FIG. 1).
[0026]
(3) The third step is a step of housing the rotated blade cutter 1 in the blade cutter case 2 and sealing the opening 9 with the knife gate 6 as shown in FIG. That is, after the second step described above, the replacement jack 5 is shortened by the length of the spacer 37, the blade cutter 1 is passed through the opening 9, and pulled into the blade cutter case 2 together with the blade cutter support member 3, In this step, the replacement jack 5 is stopped at that position, and the opening 9 is blocked by the knife gate 6. This is because if the blade cutter 1 is pulled into the back of the blade cutter case 2 at once, a large amount of muddy water may enter from the opening 9 and hinder the replacement work of the blade cutter 1. The spacer 37 needs to have at least a length that allows the blade cutter 1 to be completely accommodated in the blade cutter case 2 (that is, the opening 9 can be sealed by the knife gate 6).
[0027]
(4) The fourth step is a step of accommodating the blade cutter 1 in the maintenance hole 4 as shown in FIG. In this step, when the spacer 37 is used as shown in the figure, the spacer 37 needs to be removed. After the third step described above, the lid 2c of the blade cutter case 2 is removed, the replacement jack 5 is contracted, the spacer 37 is accommodated in the maintenance hole 4, and the spacer 37 is removed using the table lifter 46 or the like. . At this time, the replacement jack 5 is retracted. When the spacer 37 is removed, the key hole 42 of the center shaft 3b is exposed, and the replacement jack 5 is coupled to the key hole 42. Further, although the opening 9 is completely stopped in the third step, muddy water is interposed in the gap between the blade cutter support member 3 and the knife gate 6. Therefore, a mud removing valve (not shown) provided on the long cylindrical bearing 3a of the blade cutter support member 3 is opened to discharge and remove muddy water to the inside of the machine. Thereafter, the replacement jack 5 is contracted and moved onto the table lifter 46 and accommodated in the maintenance hole 4 together with the blade cutter support member 3.
[0028]
Then, the blade cutter 1 is replaced in the maintenance hole 4 and the above-described steps are reversed to return to the working state shown in FIG. 2, whereby the replacement of one blade cutter 1 is completely completed. In the case where a plurality of blade cutters 1 are provided, the cutter head 8 is then rotated so that the desired blade cutter 1 is in the state shown in FIG.
[0029]
Further, a groove is provided on the outer peripheral surface of the long cylindrical bearing 3a of the blade cutter support member 3, and a seal member (not shown) such as a U-packing is provided in the groove. Accordingly, if the blade cutter support member 3 is accommodated in the maintenance hole 4 as it is in the above-described fourth step, the seal member (not shown) is opened, and the blade cutter 1 is replaced and then the work is performed. It may be inconvenient when returning to the state. Therefore, as shown in FIG. 6, before the replacement jack 5 is contracted in the fourth step, a seal protective tube 49 that is a cylindrical member communicating with the blade cutter case 2 from the inside of the maintenance hole 4 is used with a table lifter 46 or the like. The long cylindrical bearing 3 a of the blade cutter support member 3 may be accommodated in the seal protection tube 49.
[0030]
Note that the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention.
[0031]
【The invention's effect】
According to the above-described drain material cutting device of the shield machine of the present invention and the blade cutter exchanging method of the drain material cutting device, the blade cutter is rotated around the substantially radial direction of the cutter head at the time of working, and the drain material is cut. When replacing the blade cutter, the blade cutter is housed in the maintenance hole and the blade cutter is replaced. Therefore, when replacing the blade cutter, muddy water does not enter the maintenance hole, and the sealing performance is greatly improved. Therefore, the drain material can be excavated while being cut efficiently, and the blade cutter can be exchanged smoothly.
[Brief description of the drawings]
FIG. 1 is a front view of a shield machine having a drain material cutting device for a shield machine according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
3A is a cross-sectional view taken along the line AA in FIG. 2, FIG. 3B is a cross-sectional view taken along the line BB in FIG. 2, and FIG.
FIG. 4 is a view showing a working state of a shield machine having a drain material cutting device for a shield machine according to the present invention.
FIGS. 5A and 5B are diagrams showing a blade cutter replacement method of the drain material cutting device of the present invention, where FIG. 5A is the first step, FIG. 5B is the second step, FIG. 5C is the third step, D) shows the fourth step.
FIG. 6 is a diagram showing a blade cutter replacement method of the drain material cutting device when a seal protection tube is used.
FIG. 7 is an overall configuration diagram of a conventional shield machine.
FIG. 8 is a diagram of a “shield excavator equipped with a cutting device for drainage material” proposed in Japanese Patent Laid-Open No. 7-4180.
[Explanation of symbols]
1 Blade cutter
1a blade
1b body
2 Blade cutter case
2c lid
2f Flange
3 Blade cutter support member
3a Long cylindrical bearing
3b Center shaft
3c long hole
4 Maintenance hall
4a fixed part
4b Sliding part
4c Hatch cover
5 Replacement jack
6 Knife Gate
6a Gate case
6b Gate body
7 face
8 Cutter head
9 opening
10 shield machine
11 Bulkhead
12 Drain material
13 Piston rod
14 Cylinder tube
14k keyway
15 Large gear
15k sliding key
16 small gear
16m motor
21 Shield body
22 Screw conveyor
23 Jack
24 Cutter drive device
25 bits
26 segments
27 Earth pressure gauge
28 Cutting blade
29 Blade mounting body
30 Cutting blade replacement room
31 Gate board
32 Stop plate
33 Main bit
34 Leading bit
35 Blade cutter protection bit
36 slits
37
38 Tip of replacement jack
38r axis
38p pin
39, 42 Keyhole
39a hole
39b groove
40 spacer plate
41 lid
43 Sealing member
44 Screw jack
45 Screw jack motor
46 Table lifter
47 Piston rod support member
48 Cylinder tube support member
49 Seal protection tube

Claims (3)

A blade cutter that is supported so as to be able to appear and retract from an opening provided in the vicinity of the edge of the front surface of the cutter head that rotates against the face, and that rotates with the substantially radial direction of the cutter head as an axis in a protruding state;
A blade cutter case which is a cylindrical member fixed to the cutter head and extending from the opening to the inside of the shield machine,
A blade cutter support member that slides back and forth in the blade cutter case and rotatably supports the blade cutter from a state in which the blade cutter rotates about a substantially radial direction of the cutter head to a state in which the blade cutter can pass through the opening;
A maintenance hole that is inserted into the partition wall of the shield machine and slidable in the front-rear direction,
An exchange jack provided at the rear of the maintenance hole, extending and contracting through the maintenance hole, and housing the blade cutter in the maintenance hole;
A knife gate that opens and closes the opening;
A drain material cutting device for a shield machine, comprising: The replacement jack includes a piston rod fixed to the shield machine side, a cylinder tube fitted to the piston rod and having a key groove in the outer surface axial direction, and a slide fitted to the key groove of the cylinder tube. A large gear having a key inside, and a small gear provided on the shield machine side so as to mesh with the large gear, and supplying hydraulic pressure into the cylinder tube to connect the cylinder tube to the piston The drain material cutting device for a shield machine according to claim 1, wherein the device is configured to slide along the rod and rotate the small gear to rotate the cylinder tube about the piston rod. Slide the maintenance hole inserted into the partition wall of the shield machine to the front side and connect it to the rear end face of the blade cutter case that extends into the shield machine from the opening near the edge of the front of the cutter head The first step to
A second step of rotating the blade cutter to a state where the blade cutter can pass through the opening by an exchange jack provided at the rear of the maintenance hole;
A third step in which the blade cutter rotated in the second step is housed in the blade cutter case, and the opening is sealed with a knife gate;
A fourth step of accommodating the blade cutter in the maintenance hole by shrinking the replacement jack;
And replacing the blade cutter in the maintenance hole. A blade cutter exchanging method for a drain material cutting device.

Images