JP3034830B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center support type shield machine for excavating a tunnel,
More specifically, the present invention relates to a shield machine that facilitates assembly and disassembly of a drive unit.

[0002]

2. Description of the Related Art Conventionally, a cutter disk support system such as a center support system or an outer periphery support system has been selected in accordance with a shield diameter, excavated soil, etc. However, a center support system is selected for a relatively small diameter shield machine. There are many cases.

FIG. 9 is a cross-sectional view showing such a center supporting type cutter driving unit. As shown, a cutter disk 52 is provided at a front portion of a shield main body 51, and is excavated by the cutter disk 52. A screw conveyor 54 for discharging earth and sand taken into the chamber 53 is provided below the shield body 51. A center shaft 55 that supports and turns the cutter disk 52 is provided at the axis of the shield device 50, and the center shaft 55 is driven by a drive device 58 provided with a drive gear 57 that meshes with a large gear 56. .

The center shaft 55 is connected to a front retainer 6 provided on a partition wall 59 of the shield body 51.
0, and a self-aligning roller bearing 61 in the rear retainer 62 and a thrust self-aligning roller bearing 63 in the rear retainer 62.
1 supports the radial load, and the thrust self-aligning roller bearing 63 supports the thrust load. These self-aligning roller bearings 61 and thrust self-aligning roller bearings 63
Is fixed to a predetermined position of the center shaft 55 by a metal fitting such as a nut.

[0005] The front retainer 60 is provided with a seal cover 64, and the earth and sand in the chamber 53 is transferred to the self-aligning roller bearing 61 by the earth and sand seal 65 provided between the seal cover 64 and the center shaft 55. Intrusion is prevented. 66 is a rotary joint.

[0006] As a shield machine adopting this kind of configuration, Japanese Patent Publication No. 2-24998 and Japanese Patent Publication No. 4-578 are disclosed.
There is an invention described in Japanese Patent Publication No. 40-240.

[0007]

However, in the construction of the shield machine 50, the large gear 5 is provided in the axial direction of the center shaft 55 for transmitting the rotational force to the cutter disk 52.
6 and two self-aligning roller bearings 61 and one thrust automatic roller bearing 63, and it is necessary to dispose many types of components such as nuts and earth and sand seals 65 for mounting each. The center shaft 55 becomes long, which causes an increase in weight.

Also, the front and rear retainers 60 and 62 are attached to the casing for housing the bearings 61 and 63. Therefore, the outer shape becomes large.

For this reason, a lot of man-hours are required for fitting work of parts having many precision processing parts, and many man-hours are required for dismantling parts.

On the other hand, in such a shield machine 50, the drive unit may be reused (recycled).
In order to disassemble the drive unit from the shield body 51, many parts such as the plurality of bearings 61 and 63 must be disassembled from the long and heavy center shaft 55, which requires time and labor. In addition, there are cases where this drive unit has to be taken out of the shield machine and taken out of the ground.In this case, too, it takes a lot of time, cost, and time to carry out the drive unit that is long, heavy and has a large outer diameter from the underground tunnel. Or labor is required.

Further, since the drive unit carried out in this manner is composed of many precision parts, it takes a lot of time and labor for maintenance such as re-use, so that the maintenance cost also increases, and the whole production is increased. Expenses will be high.

Further, in a relatively small-diameter shield machine, there is a demand for transporting each component to a construction site and assembling it locally on the basis of the size and weight of the component. Although it is necessary to make the parts large enough to carry the parts (determined by regulations such as the Road Transport Vehicle Law), there are many precision processing parts such as long and heavy center shafts, gears, and bearings in the drive unit, so local assembly is required. Is difficult. For this reason, the entire drive unit must be transported as a single unit, and it takes a lot of time and a large amount of money to pack up the package for local delivery.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to the present application provides a center shaft for driving a cutter disk supported only by a toothed composite cylindrical bearing. Are driven by a driving machine.

Thus, the length and weight of the center shaft can be shortened to reduce the weight, and the structure of the drive section can be simplified, so that the time and labor required for disassembly and assembly can be reduced.

[0015] Further, by forming the casing into a laterally long and different shape, the drive section can be carried out to the rear of the shield machine from the removed opening.

[0016]

DETAILED DESCRIPTION OF THE INVENTION The invention according to this application provides a toothed composite cylindrical bearing provided with a rotating member for supporting a center shaft and a fixing member for fixing the center shaft to the shield body. A casing is provided on the shield body side, which is supported only by the bearings, and has the toothed composite cylindrical bearing therein, and a drive unit for driving the teeth formed on the rotating member of the toothed composite cylindrical bearing is provided. As a result, the center shaft supporting structure for supporting the cutter disk is simplified so as to be supported only by the toothed composite cylindrical bearing, thereby reducing the number of assembling steps, and at the same time, making the drive unit compact and facilitating conveyance.

If a seal member having a soil seal between the center shaft and the center shaft is provided on the front surface of the casing and the seal member is configured to be integrally removable with the casing, a compact drive unit is formed as one unit. can do.

If the front surface of the casing is formed in an irregular shape having a small vertical direction, and the casing is provided with an irregularly shaped opening for mounting the casing, the sediment is transported to the partition using the vertical space of the casing. Means, manholes and the like can be easily provided. The front shape of the casing is a shape of a surface orthogonal to the axis of the shield machine, and is also an outer shape for attaching the casing to the shield body. Specifically, there is a flange shape for attaching to the shield body side. In addition, the irregular shape includes an oval shape, a horizontally-long oval shape, a horizontally-long rectangular shape, and the like, and any shape having a vertical dimension smaller than a width dimension may be used.

Further, the size of the opening provided in the partition is
If the casing is formed in a different shape with a width that allows passage in the vertical direction and a height that allows the length of the center shaft in the axial direction of the center shaft that incorporates the center shaft to pass through the casing, the casing can be removed from the opening from which the casing has been removed. It can be carried out to the rear of the shield machine.

Further, if a bracket for fixing the rotating member of the toothed composite cylindrical bearing to the center shaft is provided, and this bracket is disposed substantially on the same plane as the partition wall, the toothed composite cylindrical bearing to which the bracket is attached is provided. It is sufficient to provide a casing having a size that can be provided inside the shield main body, so that it is possible to effectively reduce the size of the driving unit.

In addition, by disposing the drive units on both sides of the rear surface of the casing, it is possible to secure a working space and a space for disposing devices on the inside of the device above and below the casing.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a half sectional front view of a shield machine showing one embodiment of the invention according to this application, and FIG.
2 shows a cross section taken along the line AA of FIG. 2 is a cross-sectional view taken along the line CC of FIG. 1, FIG. 3 is an enlarged cross-sectional view of the toothed composite cylindrical bearing shown in FIG. 1, and FIG. 4 is a drawing showing only a driving unit of the shield machine shown in FIG. The front view and the right are rear views. FIG.
FIG. 5 is a vertical sectional view of the driving unit shown in FIG. FIGS. 6A and 6B are views showing a state in which the drive unit is removed from the shield machine shown in FIG. 1, wherein FIG. 6A is a front view, and FIG. 6B is a sectional view taken along line DD of FIG.

As shown in the figure, a cutter disk 2 provided at a front portion of a shield main body 1 is supported by a boss 3a formed at a front portion of a center shaft 3 of a center support type. Are supported by a casing 5 fixed to the partition wall 4 of the shield main body 1 via a toothed composite cylindrical bearing G.

As shown in FIG. 3, the toothed composite cylindrical bearing G includes a rotating member 6 having a toothed portion 6a formed on the outer periphery thereof, and a fixed member 7 for supporting the rotating member 6. The rotating member 6 is rotatably supported on the outer periphery of the fixed member 7 by a plurality of rollers provided between a protrusion 6 b formed on the inner periphery of the rotating member 6 and the concave portion 7 a of the fixed member 7. This roller is the bracket 3 of the center shaft 3
Thrust roller 8 receiving thrust load acting from b side
And a thrust roller 9 receiving a thrust load acting from the casing 5 side, and a radial roller 1 receiving a radial load
0. These thrust rollers 8,
9 and radial rollers 10 are retainers 8a and 9 respectively.
a and 10a are held at predetermined positions on the circumference. Note that the fixing member 7 is formed into two front and rear parts for assembling. Further, the toothed composite cylindrical bearing G of this embodiment is:
Although a three-row composite cylindrical roller bearing with external teeth having a high load capacity has been described as an example, a composite cylindrical bearing with internal teeth may be used.

The rotating member 6 of the toothed composite cylindrical bearing G and the bracket 3b are fixed by bolts 11, and the fixing member 7 and the casing 5 provided on the partition 4 are fixed by bolts 12.

In this embodiment, since the tooth portion 6a is formed on the outer peripheral side of the toothed composite cylindrical bearing G, the driving device 13 is provided outside the toothed composite cylindrical bearing G (see FIG. 2). , A pinion 14 attached to the output shaft of the driving device 13
This drives the tooth portion 6a of the toothed composite cylindrical bearing G.

Further, in this embodiment, the front surface of the casing 5 is formed in a horizontally long, substantially oval shape (unusual shape) in which the upper and lower portions of the casing are cut out substantially in parallel. A machine 13 is provided. The vertical dimension of the casing 5 is formed so as not to hinder the rotation of the toothed composite cylindrical bearing G provided in the casing 5, and the front-rear dimension of the casing 5 is the same as that of the toothed composite cylindrical bearing G. It is formed in such a size that it can rotate without any trouble with the bracket 3b of the center shaft 3 attached to the portion.
A flange 5a is formed at the front end of the casing 5, and a plurality of mounting holes 5b are provided in the flange 5a. Reference numeral 15 denotes a rotary joint connected to the center of the rear portion of the center shaft 3.

On the other hand, the partition 4 is provided with an opening 4a for mounting the casing 5 (see FIG. 6), and around this opening 4a, a mounting hole 4b for mounting the casing 5 is provided. (Preferably, a screw hole that does not penetrate). The mounting hole 4b and the mounting hole 5 of the casing 5
b is fixed with bolts (not shown). If the size of the opening 4a provided in the partition 4 is formed by a width dimension that allows the driving section H in which the center shaft 3 is incorporated into the casing 5 to pass in the width direction, and a height dimension that allows the height direction to pass. The drive unit H removed from the partition 4 can be carried out to the rear of the shield machine M from the opening 4a.

An earth and sand seal 16 is provided between the front surface of the flange 5a of the casing 5 and the center shaft 3 so as to be in contact with the outer periphery of the center shaft 3 so as to prevent earth and sand from entering the casing 5. 16
Is attached to the casing 5 by a seal cover 17. The earth and sand seal 16 and the seal cover 17 constitute a seal member. This seal cover 1
7 has a mounting hole 17a fixed to the casing 5 by bolts (not shown), thereby forming a unit drive unit H that can be integrally removed from the partition wall 4 together with the casing 5 to which the center shaft 3 is mounted. ing.

Further, in this embodiment, since the bracket 3b provided on the center shaft 3 is disposed substantially on the same plane as the partition wall 4, the length of the center shaft 3 is reduced by the toothed portion provided at the rear part. The axial length of the composite cylindrical bearing G, the axial length of the earth and sand seal 16 provided at the front thereof, the axial length of the boss 3a for attaching the cutter disk 2, and the length obtained by adding the interval of the chamber J. Therefore, the length can be significantly reduced as compared with the related art. In addition, the amount by which the casing 5 projects to the inside of the machine can be suppressed.

Further, as shown in FIGS. 2 and 6, the partition wall 4 is dug by the cutter disk 2 by using the space above and below the casing 5 formed in a substantially oval shape, and is cut into the chamber J. A screw conveyor 18 for discharging the sediment taken in is provided at a lower portion at a predetermined angle, and a manhole 19 communicating with the inside of the chamber J is provided at an upper portion. Since there is no drive unit 13 in the space above and below the partition 4, a large working space or a space for installing equipment can be secured. Reference numeral 20 denotes a center-folding jack. In this embodiment, a center-foldable shield machine M is shown. 21 is a shield jack.

According to the shield machine M configured as described above, the cutter disk 2 can be driven as described below, and the excavation reaction force can be supported.

That is, when the tooth portion 6a of the toothed composite cylindrical bearing G is driven by the pinion 14 mounted on the output shaft of the drive unit 13, the rotary member 6 having the tooth portion 6a rotates to rotate together with the bracket 3b. The center shaft 3 is driven to rotate the cutter disk 2. The excavation reaction force from the cutter disk 2 is transmitted from the center shaft 3 to the rotating member 6 of the toothed composite cylindrical bearing G via the bracket 3b, and is transmitted from the thrust roller 8 to the fixing member 7.
To the partition 4 via the casing 5.

Therefore, the cutter disk 2 can be driven and the excavation reaction force from the cutter disk 2 can be reliably supported by the partition wall 4 formed integrally with the shield body 1.

In addition, since the shield unit M is designed to reduce the size of the drive unit H and reduce the number of precision machining units and the number of assembly operations, the shield unit M can be transported, assembled locally, or disassembled. Can be easily performed.

On the other hand, such a driving unit H is connected to a shield machine M
When removing the cutter disk from the center shaft 3, the cutter disk 2 is removed from the center shaft 3, and the casing 5 is separated from the partition wall 4.
By removing the bolt (not shown) fixed to the drive unit H, the drive unit H can be removed forward as one unit. At this time, when the driving device 13 and the rotary joint 15 mounted on the rear part of the casing 5 are removed,
As shown in the side view, the drive unit H is small in front and rear and up and down dimensions, so that it is easy to handle during assembly and disassembly work by reducing the weight, and it is also easy to carry.

The drive unit H thus removed is rotated in a predetermined direction in front of the partition wall 4 so as to turn two substantially parallel short surfaces of the casing 5 in the width direction of the shield machine M, as shown in FIG. As a result, both ends of the casing 5 are
In a state where it can pass through the opening 4a formed in
The drive unit H with the center shaft 3 incorporated in the casing 5 can be transferred from the opening 4a to the rear of the shield machine M. In other words, it is possible to allow the drive unit H to pass through without being interfered with the periphery of the opening 4 a of the partition wall 4. Therefore, removal of the drive unit H from the shield machine M after operation and removal from the underground tunnel can be easily performed. The example shown in FIG. 8 shows a state in which the drive unit H passes through the center oval opening 4a of the partition wall 4 with the front part facing upward.

The drive unit H thus carried out can be reused with main components such as the center shaft 3 and the toothed composite cylindrical bearing G incorporated therein. It can easily cope with reuse.

As described above, in the invention according to the present application, the bearings that receive the thrust load and the radial load are combined into one of the toothed composite cylindrical bearings G, so that the assembling, disassembling operation, or transport operation can be easily performed. It becomes possible.

Further, as described above, by forming the casing 5 into a substantially oval shape (an irregular shape) with the vertical direction cut off, the width of the shield machine M may be within the road transport limit depending on the size of the shield machine M. In addition, since the center shaft 3 is supported only by the toothed composite cylindrical bearing G, the height and the weight can be kept within the road transportation limit. It is also possible to easily assemble on-site, and from this point, it is possible to reduce costs and man-hours. This means that the drive unit H after operation can be integrally removed and transported by road, and the cost can be reduced even when the removed drive unit H is reused (recycled).

In the above embodiment, a mud pressure type shield machine is described as an example. However, the invention according to this application is not limited to the type of the shield machine. In the lower space of the partition 4, a sending / discharging pipe, an agitator, and the like are installed.

In the above-described embodiment, a substantially oval shaped shape is described as an example. However, as long as the driving portion H detached from the partition wall 4 can pass in a short direction, the driving portion H can have another shape. Even if there is, the same operation and effect can be obtained, and the irregular shape is not limited to a substantially oval shape.

[0043]

The invention according to this application is implemented in the form described above, and has the following effects.

By supporting the center shaft only with the toothed composite cylindrical bearing, the center shaft support structure can be simplified to reduce the number of machining and assembly steps, and the drive unit can be made compact to facilitate transportation. As a result, labor, time, and cost required for assembling, disassembling, or transporting operations can be significantly reduced.

Further, if the seal member provided on the front surface of the casing is fixed to the casing so as to be integrally detachable, the compact drive unit can be removed or transported as a unit, and the transport of the drive unit can be carried out. And can be easily reused.

Furthermore, if the front surface of the casing is formed in an irregular shape having a small vertical direction, and the irregularly shaped opening for mounting the casing is provided in the partition, the earth and sand can be carried out to the partition using the vertical space of the casing. Means, manholes, and the like can be easily provided, and the space in the narrow shield body can be effectively used.

The size of the opening provided in the partition wall is different between a width dimension in which the casing can pass in the vertical direction and a height dimension in which the length of the center shaft in the axial direction in which the center shaft is incorporated into the casing can pass. If you form
The drive unit can be integrally carried out from the opening from which the casing has been removed to the rear of the shield machine, and the labor and time required for dismantling and carrying out work can be significantly reduced.

If the bracket of the center shaft is arranged on substantially the same plane as the partition, the casing can be made compact and the drive section can be made compact.

In addition, if the drive units are arranged on both sides of the rear surface of the casing, a working space can be secured inside the upper and lower units of the casing, and the inside of the narrow shield machine can be effectively used.

[Brief description of the drawings]

FIG. 1 is a half sectional front view of a shield machine showing an embodiment of the invention according to the present application.
The B section is shown.

FIG. 2 is a sectional view taken along line CC of FIG.

FIG. 3 is an enlarged sectional view of the toothed composite cylindrical bearing shown in FIG.

FIG. 4 is a view showing only a drive unit of the shield machine shown in FIG. 1, in which a left side is a front view and a right side is a rear view.

FIG. 5 is a longitudinal sectional view of the driving unit shown in FIG.

FIGS. 6A and 6B are views showing a state in which a driving unit is removed from the shield machine shown in FIG. 1, wherein FIG. 6A is a front view, and FIG.
It is -D sectional drawing.

FIG. 7 is a side view showing a drive unit detached state of the drive unit detached from the shield machine shown in FIG. 1;

8 is a drawing showing a state in which the drive unit shown in FIG. 7 is removed from the shield machine shown in FIG. 6;

FIG. 9 is a half sectional side sectional view showing a conventional shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shield main body 2 ... Cutter disk 3 ... Center shaft 3a ... Boss part 3b ... Bracket 4 ... Partition wall 4a ... Opening 4b ... Mounting hole 5 ... Casing 5a ... Flange 5b ... Mounting hole 6 ... Rotating member 6a ... Tooth part 6b ... Projecting part 7 ... Fixing member 7a ... Concave part 8 ... Thrust roller 8a ... Thin roller 9 ... Thrust roller 9a ... Retiner 10 ... Radial roller 10a ... Retainer 11 ... Bolt 12 ... Bolt 13 ... Driver 14 ... Pinion 15 ... Rotary joint 16 ... Soil and sand seal 17 ... Seal cover 18 Screw conveyor 19 Manhole J Chamber K Seal member G Toothed composite cylindrical bearing H Drive unit M Shield machine

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-102885 (JP, A) JP-A-61-261600 (JP, A) JP-A-11-107682 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21D 9/08

Claims (6)

(57) [Claims] 1. A shield machine of a center support system in which a center shaft for driving a cutter disk provided at a front portion of a shield body is provided at an axis of the shield machine, wherein a rotating member supporting the center shaft and a shield body side are fixed. And a center shaft is supported only by the toothed composite cylindrical bearing. A casing provided with the toothed composite cylindrical bearing is provided on the shield body side, and the toothed composite cylindrical bearing is provided with the toothed composite cylindrical bearing. A shield machine provided with a drive device for driving a tooth portion formed on a rotating member of a composite cylindrical bearing with an attachment. 2. The shield according to claim 1, wherein a seal member provided with a sediment seal between the center shaft and the center shaft is provided on a front surface of the casing, and the seal member is configured to be integrally removable with the casing. Machine. 3. The casing according to claim 1, wherein the front surface of the casing is formed in an irregular shape having a short vertical direction, and an irregularly shaped opening for attaching the casing is provided in the partition. Shield machine. 4. The difference between the width of the opening provided in the partition wall in the vertical direction of the casing and the height in the axial direction of the center shaft in which the center shaft is assembled into the casing. The shield machine according to claim 3, wherein the shield machine is formed in a shape. 5. The center shaft according to claim 1, wherein a bracket for fixing to a rotating member of the toothed composite cylindrical bearing is provided, and the bracket is disposed substantially on the same plane as the partition wall. Item 2. The shield machine according to item 1. 6. The shield machine according to claim 1, wherein drive units are provided on both sides of a rear surface of the casing.