JP2002227592A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine capable of eliminating a necessity for pulling out a hydraulic pipeline of a hydraulic jack for driving an auxiliary digging cuter to the outside of the machine and confirming projecting operation of the auxiliary digging cutter visually. SOLUTION: A auxiliary digging cutter mounting device 10 provided with an auxiliary digging cutter mounting plate 12 which a plurality of auxiliary digging cutters 11 which are spare cutter bits are attached, a rod 13 attached to the auxiliary digging cutter mounting plate 12, and a slide cylinder 14 in which the rod 13 is slidably fitted and inserted is provided on a face plate 5d. An auxiliary digging cutter fixed device 20 provided with a stopper 21 fixing a position of the auxiliary digging cutter mounting plate 12 when the auxiliary digging cutter 11 retracts and advances and the hydraulic jack 22 moving the stopper 21 so as to fix a position of the auxiliary digging cutter mounting plate 12 and release its fixation is provided in an internal space of the face plate 5d. An auxiliary digging cutter ejection device 30 provided with the hydraulic jack 31 for giving a pressing force to the rod 13 is provided in a bulkhead 2 to eject and fix a position of the auxiliary digging cutter 11 when a main digging cutter is worn and damage so as to cut facing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a cutter head with a main cutting edge and a secondary cutting edge as a spare cutting edge so that a cutting face can be cut by the sub cutting edge as needed during excavation. Related to shield excavators.

[0002]

2. Description of the Related Art In a shield excavator, a carbide bit is used as a cutter bit to improve the wear resistance of the cutter bit so that the cutter bit is not worn or damaged in the process of excavating the ground with a cutter head. ing. However, if you encounter a hard ground during excavation or if the excavation distance is long, it may be worn or damaged,
You may need to change the cutter bit while digging. When replacing the cutter bit, usually, after taking safety measures such as prevention of collapse of the ground and spring water around the face, the worker goes out to the face to replace the cutter bit. The work of replacing the cutter bit by such a method not only requires a great deal of time and money but also must be performed at a face outside the shield machine, and therefore cannot always be performed safely.

[0003] For this reason, conventionally, a main digging blade, which is a main cutter bit for cutting face, is protruded from a cutter head, and a secondary digging blade as a spare digging blade is set at a position retracted from the main digging blade. A shield machine mounted on a cutter head has been developed so that it can be parked and advanced as needed. Since this shield machine has such auxiliary drilling blades, when the performance of the main drilling blade is impaired during excavation, such as when the main drilling blade is worn, the auxiliary drilling blade is advanced to participate in cutting the face. The underground pit can be excavated without hindrance. As a technique of this kind, the applicant has recently developed a technique described in Japanese Patent Application Laid-Open No. 2000-291383.

[0004] In this conventional technique, in a shield machine, a plurality of sub-drilling blades are attached to a sub-drilling blade mounting member,
The plurality of sub-drilling blades are provided adjacent to the main drilling blade so that they can protrude and retract from the face plate of the cutter head. A protruding jack as a hydraulic jack that drives the blade to protrude from the face plate is installed on the cutter head side. Also, a moving support member is provided which is driven by the moving jack in a direction parallel to the face plate and supports the sub-drilling blade mounting member from the rear side when the sub-drilling blade mounting member advances,
When the plurality of sub-digging blades project, they are held at the projecting positions by the movable support members.

Therefore, according to this conventional technique, when the performance of the main excavation blade is impaired during excavation, a plurality of sub-excavation blades are protruded from the face plate of the cutter head by jacks and are moved by the movable support member. By supporting so as not to retreat, excavation work can be performed with the auxiliary excavation blade. In addition, since the operation of the overhanging jack and the overhanging jack can be performed inside the shield machine, the worker can safely exchange the auxiliary excavating blade without going out of the shield machine. In addition, since a plurality of auxiliary excavating blades can be simultaneously protruded by the same protruding jack, the number of protruding jacks can be significantly reduced as compared with the number of auxiliary excavating blades.

[0006]

The conventional shield machine has the above-mentioned features. On the other hand, a protruding jack which is a hydraulic jack for operating the sub-drilling blade from the cutter head is installed on the cutter head side. Because
It is necessary to pull out the line of the projecting jack from the center joint (a kind of swivel joint) through the center shaft of the cutter head to supply and discharge pressure oil to the projecting jack through the center shaft of the cutter head. . Therefore, it becomes difficult to use the internal space of the center shaft used for various pipes and wirings in the shield machine without difficulty from a variety of perspectives, and a center joint for guiding a pipe in the machine to the center shaft is also required. The size of the projecting jack is relatively large due to the installation of the conduit.

Further, when operating the protruding jack for driving the sub-drilling blade, it is necessary to confirm whether or not the protruding operation has been properly performed for a number of sub-drilling blades. Since the protruding jack for driving is installed on the cutter head side, the operator himself cannot visually check the operation of protruding the sub-digging blade by the protruding jack. Therefore, it is not possible to efficiently and reliably perform the operation of confirming the projecting operation of such a large number of sub-drilling blades.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem in the prior art. The technical problem is that the operation of projecting the sub-drilling blade from the cutter head is performed by a hydraulic jack from the inside of the machine. A shield excavator that does not require the hydraulic conduit of the hydraulic jack for driving the secondary excavation blade to be drawn out of the machine, and that the operation of projecting the secondary excavation blade using the hydraulic jack can be visually confirmed. Is to provide.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above technical object, the present invention provides a shield body having a bulkhead at the front, a cutter head rotatably mounted on the bulkhead, and a cutting face. A main digging blade protruding from the cutter head, and a secondary digging blade provided as a spare digging blade at a position retracted from the main digging blade and attached to the cutter head so as to be able to move forward. In a shield excavator in which the sub-drilling blade is advanced so that the face can be cut by the sub-drilling blade, the sub-drilling blade is driven forward to a position where the face can be cut by extending it, and is retracted into the bulkhead side by contracting. A hydraulic jack for driving the sub-drilling blade is installed in the shield body, and the sub-drilling blade is positioned on the cutter head so as not to retract when it advances. Provided the position fixing means of the auxiliary drilling blade can be fixed.

Since the shield machine of the present invention employs such means, when it becomes necessary to use the auxiliary excavator during the excavation of the shield machine, a hydraulic jack for driving the auxiliary excavator is provided. By extending the sub-drilling blade, the sub-drilling blade can be projected from the cutter head to a position where the cutting face can be cut, and the position of the sub-drilling blade can be fixed to the cutter head so as not to retreat by the position fixing means of the sub-drilling blade. In this case, since the hydraulic jack for driving the sub-drilling blade is installed in the shield main body, the operator can visually check the operation of projecting the sub-drilled blade by the hydraulic jack.

After fixing the position of the sub-drilling blade at a position where the cutting face can be cut, the hydraulic jack for driving the sub-drilling blade can be retracted into the bulkhead side, and the cutting face can be cut by the sub-drilling blade. It becomes possible to make the shield excavator excavate. In the shield machine according to the present invention, since the hydraulic jack for driving the sub-drilling blade is installed in the shield main body, not only the protrusion operation of the sub-drilled blade can be visually confirmed as described above, but also the hydraulic pipe of the hydraulic jack can be checked. There is no need to draw the road out of the machine from the center joint through the center shaft. As a result, the internal space of the center shaft can be utilized in various ways, and the enlargement of the center joint due to the hydraulic pipeline of the hydraulic jack can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 7 showing concrete examples showing how the present invention is actually embodied. I do. FIG. 1 is a front view of a shield machine according to an embodiment of the present invention, and FIG. 2 is a diagram showing a state at the time of normal excavation regarding an operation mechanism of a sub-drilling blade provided in the shield machine of FIG.
(A) is a front view of a main part of the cutter head, in which a part of a face plate is removed to simplify an operation mechanism of a sub-drilling blade, and (b) shows a portion corresponding to a cross section taken along line AA of FIG. 1. Sectional view, FIG. 3
FIG. 4 is a view similar to FIG. 2 showing a state at the time of start of protrusion of the sub-drilling blade, and FIG.
FIG. 5 is a view similar to FIG. 2, and FIG. 5 is a view similar to FIG.
FIG. 7 is a view similar to FIG. 2 showing a state when the sub-drilling blade protruding device is restored to its original state and the sub-drilling blade protruding operation is completed, and FIG. It is a longitudinal section of an important section of a machine.

First, the entire outline of the shield machine will be outlined with reference to FIG. Reference numeral 1 denotes a shield body which forms the body of the shield machine, 2 denotes a bulkhead as a bulkhead for blocking the front part of the shield body 1 from the outside, and 3 denotes a center of a cutter head rotatably supported by the bulkhead 2. The shaft 4 has a ring gear 4a to which the rotation of the prime mover is transmitted by a gear (not shown), and a revolving ring as a reduction gear that rotates concentrically with the center shaft 3. A cutter head 6 rotatably mounted in front of the cutter head 5 is formed between the rear of the cutter head 5 and the front of the bulkhead 2 to take in excavated earth and sand, mix with mud, and fill the earth. Chamber for

The cutter head 5 is connected to the swivel ring 4 by a plurality of connecting members (not shown), and transmits the rotation of the swivel ring 4 via the connecting members. Digging face by attaching many digging blades. The shield excavator illustrated here is a muddy shield excavator, which is not shown, but shields a water pipe for sending muddy water and a drainage pipe for discharging excavated earth and sand mixed with muddy water. It is laid in the main body 1. In the shield body 1, a plurality of shield jacks are installed at intervals in the circumferential direction. The shield machine excavates a face with the cutter head 5 while propelling the shield body 1 with these shield jacks to form an underground pit. At this time, the muddy water is mixed with the excavated earth and sand in the chamber 6 to raise the earth pressure to prevent the face from collapsing. On the peripheral wall of the underground pit thus formed, segments are assembled and lining by an unillustrated erector. The technical contents described above are common to the conventional shield machine.

Next, the structure of the cutter head 5 related to the present invention will be described with reference to FIG. 5a is a boss provided at the front end of the center shaft 3 to form the center of the cutter head 5, 5b is a cut-spoke which is mounted on the boss 5a and mounts a cutting bit as a cutter bit, and 5c is an outer periphery of the cutter head 5. A ring-shaped outer ring forming a portion, 5d is a face plate for blocking the opening between the cut spokes 5b in the outer ring 5c, 5e is an excavated earth and sand formed between the face plate 5d and both sides of the cut spoke 5b. A slit for taking in, 7 is a main excavating blade which is a main cutter bit for cutting a face protrudingly provided on the cutter head 5 so as to be able to cut a face, and 8 is a fish for first digging a ground in the center of the cutter head 5. The tail bit 9 is a copy cutter for excavating the ground on the outer peripheral side of the shield body 1.

The cut spokes 5b have a hollow shape and a plurality of cut spokes 5b are radially arranged at equal intervals on the boss 5a. A large number of main excavating blades 7 are attached to the front surface and both side surfaces of the plurality of cut spokes 5b. The face plate 5d is formed so as to have an internal space by two spaced plates, and has a box structure. The shield machine shown here is of a muddy type, and therefore has a face plate 5d and an outer ring 5c necessary for its attachment. However, in the case of an earth pressure type shield machine, the outer ring 5c and the face plate 5d are not necessarily provided. There is no need to provide Slit 5e for taking in excavated earth and sand
Are formed near both sides of the cut spokes 5b for each cut spoke 5b, and serve to introduce excavated earth and sand into the chamber 6. When the face plate 5d is not provided on the cutter head 5, the slit 5e for taking in excavated earth and sand is not provided. The structure of the cutter head 5 described above is one that has been conventionally ordinarily employed.

In the shield machine having the above-described structure, the auxiliary machine is provided with the auxiliary cutter bit 11 serving as a spare cutter bit at a position retracted from the main cutter blade 7. By attaching to the cutter head 5 so that the main digging blade 7 can be moved forward, the sub digging blade 11 is protruded forward when the performance of the main digging blade 7 is impaired such as when the main digging blade 7 is worn or damaged. It is designed to be able to participate in cutting of face. Therefore, an operation mechanism of the sub-drilling blade for realizing such an idea is shown in FIGS.
This will be described with reference to FIG. The operation mechanism of the sub-drilling blade is roughly divided into a sub-drilling blade mounting device 10 which is disposed at a position retracted from the main drilling blade 7 and is attached to the cutter head 5 so as to be able to move forward. Secondary drilling blade fixing device 20 for fixing the position of secondary drilling blade 11 advanced to a position where cutting can be performed
And a sub-drilling blade protruding device 30 that projects the sub-drilled blade 11 forward from the cutter head 5.

First, the sub-drilling blade mounting device 10 will be described. 11 is a sub-drilling blade that is accommodated in the internal space of the face plate 5d during retreat and protrudes from the front opening of the face plate 5d during advance.
Reference numeral 12 denotes a sub-drilling blade mounting plate on which a plurality of sub-drilling blades 11 are mounted so that the sub-drilling blades 11 can be moved at the same time; 13, a rod having a front end mounted on the sub-drilling blade mounting plate 12;
d is a sliding cylinder which is housed in the internal space of the face plate 5d so as to protrude from an opening on the rear side of the rod 13 and in which the rod 13 is slidably inserted in the front-rear direction. This is a contact member that comes into contact with the sliding cylinder 14 during forward movement. FIG. 1 shows a state in which a number of sub-drilling blades 11 are attached to one sub-drilling blade mounting plate 12 as a set, but FIGS. Therefore, this is simplified, and a state in which the pair of sub-drilling blades 11 is attached is illustrated.

The sub drilling blade 11 is provided near the end of the face plate 5d near the slit 5e for taking in the excavated earth and sand.
A large number of such sub-drilling blade groups are arranged in the radial direction in FIG. The cutter bit has a larger cutting distance per rotation of the cutter head 5 than that of the cutter head 5 on the outer peripheral side and is more likely to be worn. Therefore, in the example shown in FIG. The sub-drilling blade 11 is provided so that the sub-drilling blade 11 can be advanced as needed only in a region of the cutter head 5 which is about half of the outer periphery of the cutter head 5 as a reference. With such a design, the manufacturing cost of the shield machine can be reduced.

Rods 13 are attached to both ends of the sub-drilling blade mounting plate 12, respectively. When the rod 13 is moved in the front-rear direction, the sub-drilling blade mounting plate 12 also moves. 11 can be moved simultaneously. The sliding cylinder 14 is provided corresponding to each rod 13,
It is attached to a closing plate 16 that closes a radial end of the face plate 5d. The contact member 15 comes into contact with the sliding cylinder 14 when the sub-drilling blade 11 is advanced, and is positioned at a position where the cutting face can be cut.
It works to prevent you from leaving. The rod 13 can be pressed through the contact member 15 by a sub-drilling blade protruding device 30 described in detail later.

Next, the auxiliary digging blade fixing device 20 will be described. The auxiliary excavating blade fixing device 20 is disposed in the internal space of the face plate 5d. 21 is a stopper for fixing the position of the sub-drilling blade mounting plate 12 so as to prevent the sub-drilling blade 11 from moving forward when the sub-drilling blade 11 retreats and to prevent the sub-drilling blade 11 from moving backward when the sub-drilling blade 11 advances
Reference numeral 22 denotes a position fixing hydraulic jack for moving the stopper 21 so as to fix the position of the sub-drilling blade mounting plate 12 or release the position fixing thereof, and reference numeral 23 denotes a position fixing hydraulic jack 22 for attaching the hydraulic jack 22 to the face plate 5d. The connecting member 24 is a front and rear guide piece that guides the stopper 21 so as not to swing back and forth during movement, and the reference numeral 25 is an upper and lower guide piece that guides the stopper 21 so that it does not swing up and down when moving.

The stopper 21 is provided with a bracket 26, and is fixedly connected to the bracket 27 on the hydraulic jack side for fixing the position via a pin via the bracket 26. The stopper 21 has an inverted L-shape having a back plate provided with a bracket 26 and engagement notches provided at both ends and a center portion of the back plate for engaging the front surface of the sub-drilling blade mounting plate 12. And an engaging member. When the hydraulic jack 22 is extended with the sub-drilling blade 11 retracted, the notch for engagement of the stopper 21 is set in the sub-drilling blade mounting plate 1.
2 can be prevented from moving forward by engaging with the front surface of the second excavation blade 11. When the hydraulic jack 22 is extended in a state where the sub-drilling blade 11 is advanced, the front of the engaging member of the stopper 21 is brought into contact with the rear surface of the sub-drilling blade mounting plate 12 to make the sub-drilling blade 11
Can be prevented from retreating. Thus, the sub drilling blade 11
When the hydraulic jack 22 is contracted in a state where the forward or backward movement of the sub-drilling blade 11 is prevented, the plurality of sub-drilling blades 11 can be moved at the same time by moving the sub-drilling blade mounting plate 12 in the front-rear direction. As shown in FIG. 1, a mounting member 28 for fixing the connecting member 23 is provided on the face plate 5d.
Is mounted on the mounting member 28 via the connecting member 23.

The sub-drilling blade protruding device 30, which is the last device constituting the sub-drilling blade operating mechanism, will be described. Unlike the conventional technology, the auxiliary excavating blade protruding device 30 is disposed on the bulkhead 2 side. The basic structure of the sub-drilling blade protruding device 30 shown in FIGS. 2 to 6 is not different from that of the device shown in FIG. 7 described later, and therefore will be described with reference to FIG. The sub-drilling blade protruding device 30 is roughly divided into a hydraulic jack 31 for driving the sub-drilled blade for applying a pressing force to the rod 13, and a guide cylinder 32 and a guide rod 33 arranged on both sides of the hydraulic jack 31. The hydraulic jack 31 includes a pair of guide devices and a pressing member 34 that is connected to the pair of guide rods 33 so as to extend over the pair of guide rods 33 and has a piston rod end of the hydraulic jack 31 attached to the center.

The bulkhead 2 is formed with a partition plate 35 and a connecting member 36 for connecting the bulkhead 2 to the bulkhead 2 to make it watertightly closed. ing. The hydraulic jack 31 for driving the sub excavation blade and the pair of guide cylinders 32 are attached to the partition plate 35 in a manner as shown in FIG. A pair of guide cylinders 3
The guide rods 33 are fitted into the respective 2 so as to be guided. When the pressing member 34 is pushed forward, the pressing member 34 comes into contact with the contact member 15 to apply a pressing force to the rod 13, and has a function of projecting the sub-drilling blade 11 forward.

FIG. 7 does not show the pressing member 34, but instead shows a slit shielding member 34a which will be described later.
4a, it is attached to the piston rod of the hydraulic jack 31 and a pair of guide rods 33 on both sides thereof. With such a structure of the auxiliary excavating blade protruding device 30, a pressing force can be applied to the plurality of rods 13 by one hydraulic jack 31. FIG. 2B shows a view of the auxiliary excavating blade protruding device 30 as viewed from a direction parallel to the paper surface of FIG. 7, so that the guide cylinder 32 and the guide rod 33 overlap the hydraulic jack 31. It is shown in a folded state.

When the sub-drilling blade protruding device 30 is installed,
If a single device cannot project a single sub-drilling blade group in the radial direction, including the one near the outermost periphery, two devices are required to project the one near the outermost periphery and the one on the inner side. However, even in such a case, it is not necessary to provide such a pair of devices for each of the sub-cutting blade groups in each of the radial lines (six lines in FIG. 1). That is, unlike the prior art, the hydraulic jack for driving the sub-drilling blade is provided on the shield main body 1 side, so that the minimum sub-drilling blade protrusion necessary for protruding one sub-drilling blade group in the radial direction is required. If the device 30 is provided, the cutter head 5 is rotated, and the sub-drilling blade group of each muscle is sequentially displaced to a position opposed to the sub-drilling blade protruding device 30 so that the same sub-drilling blade protruding device 30 can be used. A number of sub-drilling blade groups can be sequentially projected.

The operation and effects of the shield machine having the above-described structure will be described. At the time of excavation of the shield excavator, as shown in FIGS.
Hydraulic jack 2 for retracting and fixing position
2, the notch for engagement of the stopper 21 is engaged with the front surface of the sub-drilling blade mounting plate 12, and the
Is preventing it from moving forward. At this time, since the hydraulic jack 31 for driving the sub-drilling blade is contracted, the pressing member 34 is retracted to the bulkhead 2 side and the contact member 1
5 away from it.

If it becomes necessary to use the sub-drilling blade due to wear of the main drilling blade 7 while excavating the shield drilling machine, first, as shown in FIGS. 3 (a) and 3 (b). The engagement of the stopper 21 with the sub-drilling blade mounting plate 12 is released by contracting the position fixing hydraulic jack 22. Thereafter, as shown in FIG. 4 (b), by extending the hydraulic jack 31 for driving the sub-drilling blade, a pressing force is applied to the rod 13 while the pressing member 34 is in contact with the abutting member, and a plurality of pressing forces are applied. The sub-drilling blades 11 are projected forward of the face plate 5d, and these sub-drilled blades 11 are advanced to a position where the face can be cut.

Next, as shown in FIGS. 5A and 5B,
By extending the hydraulic jack 22 for fixing the position, a stopper 21 is attached to the rear surface of the sub-drilling blade mounting plate 12 which has been advanced.
Of the sub-drilling blades 11 is prevented from retreating. As a result, even when an excavation reaction force that retreats the cutting face when the face is being cut by the auxiliary excavation blade 11 is applied, the auxiliary excavation blade 11 is supported by the stopper 21 so as to face the excavation reaction force. Is done. Then, as shown in FIG. 6B, the pressing member 34 is retracted toward the bulkhead 2 by contracting the hydraulic jack 31 for driving the sub-digging blade. As a result, the auxiliary excavating blade protruding device 30 is configured as shown in FIG.
Then, the protruding operation of the sub-drilling blade 11 is completed, and the sub-drilling blade 11 can participate in the cutting of the face, and the excavation of the shield excavator can be resumed.

According to the shield machine, since the hydraulic jack 31 for driving the sub-drilling blade is installed in the shield body 1, the operator can visually check the operation of projecting the sub-drilled blade 11 by the hydraulic jack 31. The confirmation operation can be performed, and the operation of confirming the protruding operation with respect to the large number of sub-drilling blades 11 can be efficiently and reliably performed. Further, it is not necessary to draw out the hydraulic conduit of the hydraulic jack 31 for driving the sub-drilling blade from the center joint to the outside through the center shaft 3, so that the internal space of the center shaft 3 can be used without difficulty and in various ways. In addition, it is possible to prevent the center joint from becoming large due to the hydraulic pipeline of the hydraulic jack 31 for driving the sub-drilling blade.

In the example shown here, since the plurality of sub-drilling blades 11 are particularly mounted on the sub-drilling blade mounting plate 12, the position of the sub-drilling blade mounting plate 12 is fixed by a hydraulic jack 22 for position fixing. The positions of the plurality of sub drilling blades 11 can be fixed by the same hydraulic jack 22. Secondary drilling blade 1
As a position fixing means, a lock device comprising a lock pin urged from the cutter head 5 side by a compression spring and a locking recess provided on the rod 13 for locking the lock pin is provided. The position of the sub-drilling blade 11 may be fixed. This shield machine is
The present invention can also be applied to an earth pressure type shield excavator. In this case, when the cutter head 5 is not provided with the face plate 5d, the cutter spoke 5b is formed to be large, and the sub-drilling blade mounting device 10 and the sub-drilled blade fixing are fixed. The device 20 can be installed on a cut-spoke.

Finally, a modified example of the shield machine described above will be described with reference to FIG. Reference numeral 34a denotes a slit shielding member for shielding the slit 5e of the cutter head 5, which is an opening for taking in excavated earth and sand, when the excavator stops excavating. A plurality of slit shielding members 34a are provided so as to shield all the slits 5e of the cutter head 5. In this modified example, such a slit shielding member 34
a is attached to the hydraulic jack 31 for driving the sub-drilling blade in place of the pressing member 34, the hydraulic jack 31 is also used as a jack for driving the slit shielding member 34a, and the hydraulic jack 31 is extended, so that the slit shielding is performed. The sub-drilling blade 11 can be driven forward through the member 34a.

Therefore, according to this modification, the same hydraulic jack 31 can be used for two kinds of purposes, that is, the driving of the sub-drilling blade 11 and the driving of the slit shielding member 34a, and can be utilized in various ways. In addition, since the auxiliary drilling blade 11 can be driven forward through the slit shielding member 34a, the slit shielding member 34a can be
1 can also be used as a means for driving forward.

[0034]

As is clear from the above description, the present invention employs the means described in the section of "Means for Solving the Problems". In a shield machine where the protruding operation of the sub-drilling blade is performed from the inside of the machine by the hydraulic jack, there is no need to pull out the hydraulic pipeline of the hydraulic jack for driving the sub-drilling blade outside the machine, and
A shield machine capable of visually confirming the operation of projecting the sub-drilling blade by the hydraulic jack can be obtained. As a result, the internal space of the center shaft can be used without difficulty in various ways, and the center joint does not become large due to the hydraulic pipeline of the hydraulic jack. Can be efficiently and reliably performed.

When the present invention is embodied, and particularly when embodied in claim 1, a hydraulic jack for driving the sub-drilling blade is used as a jack for driving the slit shielding member. The same jack can be used in multiple ways, and the secondary drilling blade can be driven forward through the slit shielding member. Therefore, the slit shielding member is driven forward by the secondary drilling blade. It can also be used for the means for.

[Brief description of the drawings]

FIG. 1 is a front view of a shield machine according to an embodiment of the present invention.

2A and 2B are diagrams showing a state during normal excavation regarding an operation mechanism of a sub-excavation blade provided in the shield excavator of FIG. 1; FIG. FIG. 1B is a front view of a main part of the cutter head shown in the form of FIG.
It is sectional drawing which shows the part equivalent to a line cross section.

FIG. 3 is a view similar to FIG. 2, showing a state at the time when the sub-drilling blade starts to protrude.

FIG. 4 is a view similar to FIG. 2, showing a state at the time when the extension of the sub-drilling blade is completed.

FIG. 5 is a view similar to FIG. 2, showing a state where the position of the sub-drilling blade is fixed after the projecting of the sub-drilling blade is completed.

FIG. 6 is a view similar to FIG. 2, showing a state when the sub-drilling blade protruding device is restored to its original state and the sub-drilling blade protruding operation is completed.

FIG. 7 is a longitudinal sectional view of a main part of a shield machine according to a modification of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Bulk head 3 Center shaft 5 Cutter head 5b Cutter spoke 5d Face plate 5e Slit 6 Chamber 7 Main digging blade 10 Secondary digging blade mounting device 11 Secondary digging blade 12 Secondary digging blade mounting plate 13 Rod 14 Sliding cylinder 15 Contact Plate 20 Secondary digging blade fixing device 21 Stopper 22 Hydraulic jack for fixing position 23 Connecting member 24 Front and rear guide pieces 25 Vertical guide pieces 28 Mounting member 30 Secondary digging blade protruding device 31 Hydraulic jack for driving secondary digging blade 32 Guide cylinder 33 guide rod 34 pressing member 34a slit shielding member

Continued on the front page (72) Inventor Yasuhiro Takai 650 Kandate-cho, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D054 AC02 BA04 BB05

Claims (2)

[Claims] 1. A shield body having a bulkhead at a front portion, a cutter head rotatably mounted on the bulkhead, a main digging blade protruding from the cutter head so as to cut a face, and a spare digging blade. A sub-drilling blade is provided at a position retracted from the main drilling blade and is attached to the cutter head so as to be able to move forward.The sub-drilling blade is advanced as necessary during excavation and the face is cut by the sub-drilling blade. In the shield excavator, the hydraulic jack for driving the sub-drilling blade that can be moved to the position where the cutting face can be cut by extending it and retracted to the bulkhead side by shrinking is installed in the shield body. In addition to installing the auxiliary drilling blade, the secondary drilling blade has a position fixing means capable of fixing the position of the secondary drilling blade to the cutter head so that the secondary drilling blade does not move backward when the blade is advanced. Features a shield machine. 2. A front end side of a jack for driving a sub-drilling blade,
By providing a slit shielding member for shielding the slit of the cutter head and using the jack for driving the sub-drilling blade as the jack for driving the slit shielding member, and extending the hydraulic jack for driving the sub-drilling blade, the slit is formed. The shield excavator according to claim 1, wherein the sub-drilling blade can be driven forward through a shielding member.