JP2002004775A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine in which a cutter bit used for excavation can be changed rapidly during pipe jacking. SOLUTION: The shield machine is constituted, including a spoke unit 60-1, which is installed to a cutter head 22 and in which at least one of a plurality of the cutter bits is fixed at a specified rotational-angle position, and a rotary driving device 27 rotating and driving the spoke unit 60-1, and the spoke unit 60-1 is turned so that a ground is excavated by using the cutter bit fixed to the spoke unit 60-1 under the specified pipe-jacking conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine and, more particularly, to a shield machine used for long distance excavation.

[0002]

Background Art and Problems to be Solved by the Invention
Various shield excavators used for long-distance excavation have been proposed.

[0003] When such long-distance excavation is performed, abrasion of a cutter bit used for excavation becomes a serious problem.

[0004] In addition, during excavation of the ground, the soil composition of the ground changes, and at a certain point, a hard ground layer such as a clay layer hits the outer peripheral portion of the cutter head, and at another point, the cutter head is hardened. May be hit by a hard stratum.

When excavating a hard stratum, it is preferable to replace the cutter bit because the cutter bit wears with the excavation. However, exchanging the cutter bit during excavation takes time and effort. .

If it is known in advance that a hard stratum appears, it may be possible to excavate while avoiding the hard stratum. However, there is a large amount of excavation, which may lead to an increase in construction period and cost. Become.

In addition, the present applicant has cut the ground to a predetermined size or less while excavating while maintaining the skeleton structure of the soil particles in the same state as the ground state (hereinafter referred to as a solid state). There is provided a technique for transporting fluid that has been cut and excavated in a solid state and transports it out of a pit.

[0008] However, in recent years, excavation of a long distance or the like has been performed more and more, and it is necessary to cut and excavate the ground at an optimum size according to the excavation distance. Further, as the excavation proceeds, the soil properties of the ground to be excavated change, and it is necessary to cut and excavate the ground at an optimal size according to the soil properties of the ground.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a shield machine capable of rapidly changing a cutter bit used for excavation during excavation. Another object of the present invention is to provide a shield machine capable of quickly changing the excavation position by a cutter bit during excavation. Still another object is to provide a shield machine capable of adjusting the size of excavated earth and sand to be cut and excavated.

[0010]

In order to solve the above problems, a shield machine according to the present invention has a cutter head having a plurality of cutter bits for excavating the ground, and the rotation of the cutter head. According to a shield excavator for excavating the ground in the excavation route, provided in the cutter head, at least one of the plurality of cutter bits is fixed at a predetermined rotation angle position of the rotation mounting portion, Driving means for rotating the rotary mounting portion, and rotating the rotary mounting portion so as to excavate the ground using a cutter bit fixed to the rotary mounting portion in a predetermined excavation condition. It is characterized by making it.

According to the present invention, for example, in a digging situation in which a digging distance has been digged, a cutter bit is reinforced or switched by rotation,
It is hardly affected by the wear of the cutter bit and can effectively excavate. This makes it unnecessary to replace the cutter bit particularly when excavating over a long distance, and it is possible to excavate efficiently.

Further, according to the present invention, for example, in a digging situation in which a hard ground is hitting a cutter bit at a peripheral portion of a disk-shaped cutter head, the rotary mounting portion is rotated and the peripheral mounting portion is rotated. It is possible to excavate the ground at the periphery using a cutter bit fixed so as to excavate the part. Thereby, the excavation efficiency of the peripheral portion can be enhanced, and excavation can be performed comfortably according to the ground condition.

[0013] Further, at least one of the rotation mounting portions may be provided at a plurality of different rotation angle positions of the rotation mounting portion.
One cutter bit is fixed, and the driving means rotates the rotary mounting portion so as to excavate the ground using the cutter bit fixed at the predetermined rotation angle position in the predetermined excavation condition. In particular, it is preferable to rotate the rotation mounting portion so as not to use a cutter bit provided at another rotation angle position different from the rotation angle position.

According to this, for example, in the initial state, the first cutter bit attached to the predetermined rotation angle position of the rotation attachment portion is directed to the face, and is attached to the same rotation attachment portion at a different rotation angle position. By not directing the second cutter bit to the face, excavation can be performed using only the first cutter bit.

In a digging situation where the digging has been performed for a predetermined digging distance, the second cutter bit is turned to the face by rotation, and the first cutter bit is not turned to the face by rotation, so that the worn first cutter bit is turned. Alternatively, excavation can be performed using a non-worn second cutter bit.

With this arrangement, it is not necessary to replace the cutter bit when excavating a long distance, and the excavation can be performed efficiently.

Further, the cutter bit provided at the predetermined rotation angle position and the cutter bit provided at the other rotation angle position are fixed to the rotation mounting portion so that the ground excavation position is different. It is preferred that

According to this, for example, in a digging situation where hard ground can appear on the ground, a plurality of positions such as the peripheral portion and the central portion of the cutter head are set as positions for reinforcing the digging during the digging. In this case, the cutter bit for reinforcing the peripheral part and the cutter bit for reinforcing the central part are mounted on the same rotating mounting part, and the cutter bit for reinforcing the peripheral part and the central part are used for excavation according to the excavation situation. The excavation position can be quickly changed by switching between the cutter bit and the excavator, and the excavation can be performed comfortably.

Further, it is preferable to include a plurality of rotation attachment portions and a plurality of driving means for rotating the plurality of rotation attachment portions.

According to this, the switching of the cutter bit as a countermeasure for the excavation reinforcement and wear can be performed more widely.

The plurality of cutter bits may include a fixed cutter bit group fixed to the cutter head,
A rotary cutter bit group fixed to the rotary mounting portion, wherein the driving means rotates the rotary mounting portion to form a plurality of preceding excavation grooves in the ground using the rotary cutter bit group. At least a part of the fixed cutter bit group is formed so as to cut out and excavate the ground protruding portion left undigged between the preceding excavation grooves formed in the ground in a solid state. Is preferred.

According to this, it is possible to change the formation position of the preceding excavation groove by the rotary cutter bit group, and to cut out and excavate the convex portion between the preceding excavation grooves using at least a part of the fixed cutter bit group. Thereby, appropriate cutting excavation can be performed.

That is, the size of the excavated earth and sand to be cut and excavated can be appropriately adjusted according to the ground to be excavated and the excavation distance.

The plurality of cutter bits may include a group of fixed cutter bits fixed to the cutter head,
A rotary cutter bit group fixed to the rotary mounting portion, wherein the driving means rotates the rotary mounting portion and uses the partial cutter bit group of the rotary cutter bit group to form the ground. A plurality of preceding excavation grooves are formed at the same time, and the ground protruding portion left undigged between the preceding excavation grooves formed on the ground using the other cutter bit group of the rotary cutter bit group is in a solid state. It is preferable to cut out and excavate.

According to this, the width between the preceding excavation grooves is adjusted by using a part of the rotary cutter bit group, and cut and excavated by using the other part of the rotary cutter bit group. Appropriate cutting excavation can be performed.

[0026] The fixed cutter bit group includes a cutter bit group that forms a plurality of preceding excavation grooves in the ground and a ground protruding portion that is left dug between the preceding excavation grooves formed in the ground. And a cutter bit group for cutting out and excavating in a solid state.

According to this, it is possible to adjust the size of the excavated material to be cut out and excavated using both the rotating cutter bit group and the fixed cutter bit group.

That is, the fixed cutter bit group has higher stability during excavation than the rotary cutter bit group. On the other hand, the rotary cutter bit group has higher flexibility such as position change at the time of excavation than the fixed cutter bit group.

Therefore, by excavating using both the rotating cutter bit group and the fixed cutter bit group,
Cutting excavation can be performed while ensuring flexibility and stability during excavation.

It is preferable that the apparatus further includes control means for controlling the driving of the driving means based on at least one of the rotation speed and the excavation speed of the cutter head.

According to this, it is possible to perform control according to the ground to which the ground is actually applied, and it is possible to cut and excavate the ground in an optimum size in accordance with the soil properties and the excavation distance of the ground to be excavated.

[0032] In addition, the carry-out path for carrying out the excavated material outside the mine includes excavated matter measuring means for measuring the size of the excavated material, and the control means includes: It is preferable to control the driving of the driving means.

According to this, it is possible to perform feedback control while monitoring the actual size of the excavated object.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings, taking as an example the case where the present invention is applied to a shield excavator used in a muddy water shield construction method for excavating a long distance.

(Example of Preventing Wear of Cutter Bit) FIG.
FIG. 1 is a schematic diagram of a side cross section of a shield machine 2 according to an example of the present embodiment.

In the muddy shield method, the muddy water is supplied to the chamber 21 inside the shield machine 2 to stabilize the face 390 while the cutter head 22 of the shield machine 2
This is a method of constructing a tunnel by excavating the ground by rotating a rock.

In the muddy-water shield method, muddy water is supplied to the face 390 for producing muddy water for stabilizing the facet, a property adjusting facility for adjusting the muddy water property, a digging facility for excavating the face 390, and a face 390. A transportation facility for carrying out the excavated mud outside the mine, a muddy water treatment facility for appropriately treating the excavated mud, and a lining construction facility for constructing a lining structure in the excavation pit are used.

Shield machine 2 functioning as excavation equipment
, The segment 26 is successively added together with the excavation, and while the reaction force is applied to the segment 26 by the jack 28, the cutter head 22 is rotated by turning the cutter head 22 while opposing the face pressure by the mud pressure supplied to the chamber 21. Excavate.

The muddy water supplied to the chamber 21 inside the shield machine 2 is sent from a mud making facility or a muddy water treatment facility on the ground via a mud feeding pipe 50 which is a part of the mud feeding facility. The muddy water used for stabilization at 390 is mixed with the excavated earth and sand in the chamber 21 and is sent to a muddy water treatment facility on the ground via a mud discharge pipe 52 which is a part of the transport facility.

Here, the transport equipment means the entire equipment for carrying out the excavated earth and sand taken in from the cutter head 22 to the outside of the pit.
It includes a sludge pipe 52 functioning as a fluid transport pipe, a sludge pump 102 functioning as a pressure pump, and the like.

In the muddy water treatment equipment, solids such as excavated earth and sand contained in the muddy water and liquids are separated (solid-liquid separation), and a part of the separated liquids is subjected to necessary component adjustment in a regulating tank. After being performed, it is sent out again to the shield machine 2 and reused as muddy water.

The muddy water sent to the chamber 21 is subjected to necessary property adjustment by a property adjusting facility or the like in the tunnel. Specifically, the property adjusting equipment in the tunnel is provided in the mud tank 40 and the mud feed pipe 50, and the mud tank 4
It comprises a static mixer 44 for mixing and stirring a mud (eg, a thickener, a dispersant, etc.) supplied from 0 and muddy water, and a viscometer 46 for measuring the muddy water state after the mixing and stirring. I have.

If necessary, a predetermined slurry preparation is added from the slurry preparation tank 40, and the muddy water stirred and mixed by the static mixer 44 is measured for viscosity by a viscometer 46 and supplied to the chamber 21.

The result of the measurement by the viscometer 46 is transmitted to the control unit 4.
8, and the controller 48 adjusts the addition of the mud conditioning agent based on the measurement result.

When excavating over long distances, even if mud is formed on the ground in accordance with the soil properties of the face 390 and the adjusted mud is supplied to the face 390, when the adjusted mud reaches the face 390, the mud is formed at the time of mud making. The intended face 390 may be different from the soil properties.

As in the present embodiment, based on the properties of the muddy water in the vicinity of the face 390, the muddy water is added to the muddy water so that the properties of the muddy water can be almost in real time even when excavating a long distance. Can be adjusted. This makes it possible to stabilize the face in real time.

On the other hand, the muddy water returned from the chamber 21 to the muddy water treatment equipment is pumped by a muddy water pump 102 provided in a muddy water pipe 52.

Next, the driving method of the cutter bit in the cutter head 22 will be described.

FIG. 2 is a front view of the cutter head 22 according to an example of the present embodiment.

The cutter head 22 has a plurality of leading bits 70-1 to 70-11, 72-1 to 7-7 for performing leading digging.
2-8, a plurality of main bits 80-1 to 80-9,
A copy cutter 90 used in curve excavation or the like is provided.

The cutter head 22 having the leading bits 70 and 72 and the main bit 80 is driven to rotate in the direction of the arrow shown in FIG. 2 by the rotating device 24 shown in FIG. Cut and excavate in solid state.

Here, the leading bit is the cutter head 2
The leading bits 70-1 to 70-11 fixed to the two spoke units 30-1 to 30-3, and the cutter head 2
2 and includes leading bits 72-1 to 72-8 fixed to spoke units 60-1 to 60-3, which are a kind of rotatable rotary mounting portion.

Next, the spoke unit 60-1 will be described.

FIG. 3 is a side sectional view of a spoke unit according to an example of the present embodiment. FIG. 4 is a plan sectional view of a spoke unit according to an example of the present embodiment.

In the spoke unit 60-1 shown in FIG. 3, the first set of preceding bits 72-1 to 72-3 and the same excavation locus as the preceding bits 72-1 to 72-3 are drawn, and It is configured to include a second set of preceding bits 73-1 to 73-3 provided at different rotational positions.

Further, the leading end of the leading bit 72 or the leading end of the leading bit 73 is directed in the digging direction.
A rotation driving device 27, which is a rotation driving unit that rotationally drives the spoke unit 60, which is a rotation attachment portion, is provided on the back surface of the cutter head 22.

In the initial state, as shown in FIG. 3, the leading end of the leading bit 72 is oriented in the direction of excavation.
The spoke unit 60 is rotated using the rotary drive device 27 as shown in FIG.
Is rotated 90 degrees in the depth direction shown in FIG.

As a result, the entirety of the preceding bit 72 is disposed on the back surface of the cutter head 22, and the tip of the preceding bit 73 is disposed before the cutter head 22 and used for excavation.

As described above, a new cutter bit can be quickly used for excavation in place of the cutter bit worn by the rotation, and it is possible to efficiently cope with the wear of the cutter bit.

Also, by using such a rotating mechanism, the excavation position of the cutter bit can be quickly changed. Next, an example in which the excavation position of the cutter bit is changed will be described.

(Example of Changing Excavation Position) FIG. 5 is a schematic diagram of a face.

The cutter head 22 of the shield machine according to another example of the present embodiment for digging the face 390 includes:
Outermost peripheral bit 10-1 fixed to cutter head 22
Cutter bits 12-1 to 12-12 that can be adjusted and moved in a direction that intersects the direction of excavation of the cutter bit by rotation of the cutter head 22 (the direction of the solid arrow in FIG. 1).
-3 are provided. Actually, more cutter bits are provided on the cutter head 22.

In the initial state, the cutter bits 12-1 to 12-1
Reference numeral 12-3 is disposed at an intermediate position between the center of the cutter head 22 and the outer edge.

The face 390 shown in FIG.
2 and a part of the soft ground 304.

A part of the ground 302 is on the excavation path of the shield excavator, and the outermost bits 10-1 to 10-3 are hit. For this reason, it is necessary to enhance the excavating force on the outer peripheral portion of the cutter head 22, but it is difficult to provide a new cutter bit on the outer peripheral portion to assist excavation. In this state, the cutter bits 12-1 to 12-
3 is a cutter bit 1 because it does not hit the ground 302.
2-1 to 12-3 cannot be used for excavation assistance of the outermost bits 10-1 to 10-3.

In this embodiment, the cutter bit 12-
By moving 1-12-3 in the direction of the outer edge of the cutter head 22 (in the direction of the dashed arrow in FIG. 5) and arranging them in the outer peripheral portion indicated by the broken line, the outermost bits 10-1 to 10-3 are assisted in excavation. Used.

As described above, by changing the arrangement of the cutter bits 12-1 and the like on the cutter head 22, appropriate excavation can be performed according to the properties of the ground.

In order to perform such adjustment movement of the cutter bit 12-1 and the like, the present embodiment uses the above-described rotatable spoke unit 60.

FIG. 6 is a side sectional view of a spoke unit according to another example of the present embodiment.

The spoke unit 6 described with reference to FIG.
0-1, the leading bits 72-1 to 72-3, 73-1
-73-3 were arranged at positions where the same excavation trajectory was drawn.

On the other hand, in the spoke unit 60 shown in FIG. 6, the leading bits 75-1 to 75-3 are arranged so that the leading bits 7-1 to 75-3 excavate a position slightly shifted in the outer circumferential direction with respect to the leading bits 72-1 to 72-3. It is arranged in the unit 60-1.

For example, when the spoke unit 60-1 is rotated by 90 degrees in the depth direction shown in FIG. 3 by the rotary driving device 27, the preceding bits 75-1 to 75-3 are replaced with the preceding bits 72-1 to 72-3. -3 turns to the excavation direction.

Thus, the preceding excavation groove can be formed at a position shifted toward the outer peripheral direction as compared with before the rotation.
Therefore, the preceding bit can be used for assisting excavation of the outermost bit, and appropriate excavation can be performed according to the soil properties of the ground.

As described above, changing the formation position of the preceding excavation groove is also effective in the case of performing solid recovery for recovering the cut and excavated ground in a solid state. Next, an example of solid recovery will be described.

(Example of Solid Recovery) FIG. 7 is a front sectional view of a sludge pump according to an example of the present embodiment.

The sludge pump 102 includes a plurality of rotating blades 100-1 and 100-2. Therefore,
When the size of the excavated object 110, that is, the excavated earth and sand exceeds the net distance L between the blades 100, the excavated object 110 may block the sludge pump 102 and the sludge pipe 52, and may not function as a transport facility. is there.

To solve this problem, conventionally, the sludge pump 1
In some cases, a crusher or the like is newly provided to crush the excavated material 110 so as to prevent the transportation facilities such as 02 from being blocked. However, in this method, the crushed excavation 1
10 was easily dissolved in the muddy water, so that the classification efficiency in the muddy water treatment equipment was poor.

As the amount of excavated matter dissolved in the muddy water increases, the amount of solids classified in the primary treatment in the muddy water treatment equipment decreases, and accordingly, the amount of treatment that must be classified in the secondary treatment increases. Become. When the secondary processing amount increases, 2
The scale of the secondary processing equipment will increase, and the area of the shaft site required for that will also increase.

Therefore, if the amount of classification in the primary treatment is increased, the secondary treatment can be made more efficient, and the required shaft site can be reduced in area.

Further, since the secondary treated soil is a soft soil containing water, it is treated as industrial waste (sludge), so that a great deal of labor and cost are required for its disposal.

That is, in order to reduce the area of the shaft site, reduce the burden on the environment, and reduce the processing cost,
It is necessary to classify 10 by primary treatment as much as possible.

Therefore, the excavated material 110 is
By excavating to the maximum size that does not clog in 02 and carrying it out of the mine in a solid state as it is, the efficiency of the treatment of the muddy water containing excavated earth and sand can be increased, and the environmental load and cost can be reduced.

Further, as the excavating distance of the shield excavator 2 becomes longer, the required number of the sludge pumps 102 increases, and the soil properties of the ground change with the excavation. Therefore, FIG.
Although the blade 100 in the sludge pump 102 shown in FIG. 2 has a configuration of two sheets, there may be a configuration of three or more blades. In this case, the pure interval L between the blades 100 is also shortened, The size of the excavated object 110 passing through the sludge pump 102 is also smaller.

Therefore, in order to always keep the dissolution rate of the excavated material 110 in the muddy water low, the size of the excavated material 110 at the time of excavation and excavation according to the excavation distance and the soil properties of the ground is set to the optimum size. It needs to be adjusted. In the present embodiment, the cutter head 22 is provided with a preceding bit for excavating the ground in advance and forming a preceding excavation groove, and a succeeding bit for cutting out and excavating the ground protuberance between the preceding excavation grooves.

Next, ground excavation by preceding excavation and subsequent excavation (cutting excavation) will be described.

FIG. 8 is a schematic plan view showing a ground excavation state due to advance and retreat of the leading bit and the following bit.
FIG. 8A shows a state before the preceding excavation, and FIG.
(C) is a figure which shows the digging state of the ground after trailing digging.

First, in the initial state, as shown in FIG. 8A, the excavation surface 410 of the ground 300 at the portion to be excavated is flat.

The shield machine 2 excavates in the direction of the arrow. When the shield machine 2 excavates, the leading bit precedes the following bit and excavates the ground 300 at the portion to be excavated in a streak shape, thereby forming the preceding excavation groove 3 on the excavation surface of the ground 300.
10-1 and 310-2 are formed.

The depths of the preceding excavation grooves 310-1 and 310-2, that is, the excavation depth L2 are substantially L, and the interval L1 between the preceding excavation grooves 310-1 and 310-2 is also substantially L. . Here, L is the above-described sludge pump 1 shown in FIG.
02 is the maximum size that will not block the 02.

Further, the preceding excavation grooves 310-1 and 310-2
, Ie, the excavation width L3 is also equal to or less than L.
As a result, the excavated matter generated by the preceding excavation also has a size of L or less, and the excavated matter can be carried out of the mine without blocking the transportation facilities.

By the preceding excavation, the state shown in FIG. 8A is changed to the state shown in FIG. 8B.

In the state shown in FIG. 8B, the preceding excavation grooves 310-1 and 310-2 of the ground 300 to be excavated.
In this state, a belt-shaped convex portion having a protruding length and a protruding width of L or less is left as a ground.

In this state, a part of the remaining band-shaped convex portion is cut out and excavated so that the excavated object 110 is
00, and the state shown in FIG. 8C is obtained. As a result, the excavated object 110 is cut out and excavated in a cubic shape having a length L. Note that, in practice, the excavated object 110 has a rounded corner during transportation to the ground treatment facility, and becomes almost spherical.

FIG. 9 is a schematic diagram of the excavation path of the preceding bit and the following bit before adjusting the interval between the preceding excavation grooves according to an example of the present embodiment.

For example, it is assumed that the size of the excavated object 110 is cut out and excavated in the size of the diameter L.

Since the width between the excavation paths of the preceding bits 70 and 72 is L and the width of the following bit 80 is also L, the size of the excavated object 110 is cut out to the size of the diameter L. it can.

However, as described above, when the excavation distance becomes longer, the configuration of the blade 100 of the mud pump 102 changes, and the size of the excavated material 110 is made smaller than L in order to prevent dissolution in muddy water. It is necessary to excavate at.

For example, the size of the excavated object 110 is set to the diameter L /
It is assumed that cutting and excavation are performed at a size of 2.

FIG. 10 is a schematic diagram of the excavation path of the preceding bit and the following bit after adjusting the interval between the preceding excavation grooves according to an example of the present embodiment.

The width between the excavation paths of the preceding bits 70 and 74 is L / 2, and the width of the succeeding bit 80 is also L. Therefore, the size of the excavated object 110 is changed to the size of the diameter L / 2. It can be cut out and excavated.

More specifically, for example, by adopting the following configuration, the size of the
It can be cut and excavated in size 2.

FIG. 11 is a plan sectional view of a spoke unit according to another example of the present embodiment.

The spoke unit 60-1 is provided with a plurality of leading bits 7 that are oriented in the excavation direction in the initial state and perform precedent excavation.
2-1 to 72-3 and a plurality of preceding bits 74-1 to 74-3 stored in the cutter head 22 without being directed in the excavation direction in an initial state are provided.

In the initial state, as shown in FIG. 9, the size of the excavated object 110 is cut out and excavated by using the preceding bit 70 and the preceding bits 72-1 to 72-3.
Then, when it becomes necessary to cut out the size of the excavated object 110 at the diameter L / 2 and excavate, the spoke unit 60-1 is rotated by 90 degrees in the depth direction shown in FIG. As a result, the preceding bits 72-1 to 72-1
The preceding excavation can be performed using the preceding bits 74-1 to 74-3 instead of the 72-3. Leading bits 74-1
As shown in FIG. 10, the leading bits 74-1 to 74-3 are connected to the spoke unit 60-1 so that the interval between the leading bits 74-1 and 74-3 is L / 2, as shown in FIG. Are located in

As described above, the formation position of the preceding excavation groove can be changed, and the excavated object 110 to be cut and excavated can be changed.
Can also be changed in size.

It is possible to change not only the leading bit but also the excavation position of the following bit.

FIG. 12 is a side sectional view of a spoke unit portion provided with trailing bits 580 and 582 according to an example of the present embodiment.

In the first spoke unit provided on the cutter head 22 shown in FIG. 12, the leading bits for adjusting the interval are the first set of leading bits 570-1 to 570.
-3 and a second set of preceding bits 572-1 to 572, which are drawn at different rotational positions and have a different digging trajectory than that of -3.
3 is included.

[0109] A rotary drive unit, which is rotary drive means for rotating the first spoke unit, is provided on the back surface of the cutter head 22 so that the leading end of the leading bit 570 or the leading end of the leading bit 572 is directed in the excavation direction. Is provided.

As shown in FIG. 12, in the initial state, the leading end of the leading bit 570-1 is oriented in the excavation direction. However, when it becomes necessary to adjust the size of the excavated object, the leading bit 572-1 is set. The spoke unit is rotated by the rotary drive device so that the tip of the bit is directed in the excavation direction.

The second spoke unit 56 having trailing bits 580 and 582 at a position different from the position of the cutter head 22 where the first spoke unit is provided.
2 are provided.

The second spoke unit 562 has the same structure as that of the first spoke unit.
Is driven to rotate. As a result, in the initial state, the trailing bit 580 is oriented in the digging direction, but is driven to rotate, so that the trailing bit 582 is oriented in the digging direction.

Further, the following bit 580 is the following bit 5
An excavation locus different from 82 is drawn. That is, the trailing bit 580 is formed so as to cut out and excavate the remaining ground protruding portion between the preceding excavation grooves formed by the preceding bits 570-1 and 570-2. On the other hand, the following bit 5
Reference numeral 82 is formed so as to cut out and excavate the remaining ground protruding portion between the preceding excavation grooves formed by the preceding bits 572-1 and 572-2.

In other words, by rotating the second spoke unit 562 in accordance with the rotation of the first spoke unit, the surface of the following bit hits the entire surface of the ground protrusion, so that the excavation can be performed. Even when the width between the excavation grooves is adjusted, it is possible to cut out and excavate comfortably because the collapse of the ground projection does not easily occur.

(Modifications) Although the preferred embodiments to which the present invention is applied have been described, the application of the present invention is not limited to the above-described embodiments.

For example, when the leading bit or the trailing bit is attached to the movable attaching portion, the leading bit, the trailing bit only, the leading bit, and the trailing bit may be attached to one attaching portion. Further, the number of cutter bits such as a leading bit and a trailing bit to be attached to the attachment portion may be one, or may be two or more.

Further, in the above-described embodiment, the example in which the interval between the preceding excavation grooves is adjusted by the combination of the preceding bit fixed to the cutter head 22 and the movable preceding bit has been described. The interval between the preceding excavation grooves may be adjusted only by the bit.

In the above-described embodiment, an example has been described in which excavation is performed by fixing the preceding bit to a mounting portion such as a spoke unit. By fixing the leading bit to the mounting portion in this way, the stability during the adjustment movement and the leading excavation is improved. Of course, it is also possible to configure so that each preceding bit is moved independently, instead of the mounting portion.

When excavation is performed with the preceding bit fixed to a mounting portion of a spoke unit or the like, the spoke unit itself may be advanced or retracted in the direction of excavation of the shield excavator using a jack or the like.

In order to discharge the excavated material 110 as it is, as shown in FIG.
The dissolution inhibitor supplied from the
It is designed to be added to the muddy water including the excavated material 110 inside.

The amount of solid dissolved in the mud water in the mud pipe 52 is measured by the excavated object measuring device 120 provided in the mud pipe 52 near the face 390. This measurement is based on the specification (Japanese Unexamined Patent Application Publication No.
59623) is preferably performed using a measuring device using radio waves.

This measuring device radiates radio waves to muddy water, receives radio waves propagating in muddy water, calculates the density of solids based on the reception level, and calculates the size of solids from the density. Can be measured accurately.

The control device 48 determines
Adjust the amount of dissolution inhibitor added to the wastewater. As a result, the amount of the dissolution inhibitor added can be suppressed to the minimum necessary. Further, by controlling the amount of the dissolution inhibitor added based on the measurement result, it is possible to perform appropriate muddy water excavation with a smaller amount of the agent. Therefore, the use of the minimum necessary resources is sufficient, and the cost can be reduced.

Further, the values measured by the excavated object measuring device 120 (such as the size of the excavated object 110) are transmitted to the control device 48 shown in FIG. 1 in real time. It is preferable that the control device 48 controls the driving of the jack 27 of the spoke unit 60 based on the value measured by the excavated object measuring device 120.

According to this, it is possible to perform feedback control while monitoring the actual size of the excavated object.

Further, in the above-described embodiment, the cutter head 2 is disk-shaped, but the cutter bit provided on the drum-shaped cutter head used when excavating a rectangular excavation section is moved by excavation. It is also possible to change the excavation position by moving in the direction intersecting the direction.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a side cross section of a shield machine according to an example of an embodiment.

FIG. 2 is a front view of a cutter head according to an example of the present embodiment.

FIG. 3 is a side sectional view of a spoke unit according to an example of the present embodiment.

FIG. 4 is a plan sectional view of a spoke unit according to an example of the present embodiment.

FIG. 5 is a schematic view of a face.

FIG. 6 is a side sectional view of a spoke unit according to another example of the present embodiment.

FIG. 7 is a front sectional view of a sludge pump according to an example of the present embodiment.

FIG. 8 is a plan view schematically showing an excavation state of the ground due to advance and retreat of a preceding bit and a following bit. FIG. 8 (A) shows the state before the preceding excavation, FIG. (C) is a figure which shows the digging state of the ground after trailing digging.

FIG. 9 is a schematic diagram of a digging path of a leading bit and a trailing bit before adjusting the interval between preceding digging grooves according to an example of the present embodiment.

FIG. 10 is a schematic diagram of a digging path of a leading bit and a trailing bit after adjusting a distance between preceding digging grooves according to an example of the present embodiment.

FIG. 11 is a plan sectional view of a spoke unit according to another example of the present embodiment.

FIG. 12 is a side cross-sectional view of a spoke unit portion including a trailing bit according to an example of the present embodiment.

[Explanation of symbols]

 22 Cutter head 27, 29 Rotary drive device 60, 562 Spoke unit 102 Sludge pump

Continued on the front page (72) Inventor Masago Yasumoto 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Corporation (72) Inventor Konosuke Nakamura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Takeshi (72) Inventor Yoshio Iwai 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Takeshi Corporation (72) Inventor Yasuhiko Asai 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Takeshi Inside the company (72) Inventor Yuji Sakuma 11-1, Kitahama-cho, Chita-shi, Aichi Prefecture Inside the Aichi Plant, Harima Heavy Industries, Ltd. (72) Inventor Toshiaki Uehara 2-2-1, Otemachi, Chiyoda-ku, Tokyo In-house Co., Ltd. (72) Inventor Hiroyuki Ito 11-1 Kitahama-cho, Chita-shi, Aichi F-term in the Aichi Plant of Harima Heavy Industries, Ltd. F-term (reference) 2D054 AC05 BA03 BB05

Claims (7)

[Claims] 1. A shield machine having a cutter head having a plurality of cutter bits for excavating a ground, wherein the cutter excavates a ground on a digging route by rotating the cutter head, A rotary mounting portion provided on the head, wherein at least one of the plurality of cutter bits is fixed at a predetermined rotation angle position; and a driving unit for driving the rotary mounting portion to rotate. And a rotary excavator that rotates the rotary mount so as to excavate the ground using a cutter bit fixed to the rotary mount. 2. The digging condition according to claim 1, wherein at least one cutter bit is fixed to each of the rotation mounting portions at a plurality of different rotation angle positions of the rotation mounting portion. 3. The shield excavator according to claim 1, wherein the rotary mounting portion is rotated so as to excavate the ground using a cutter bit fixed at the predetermined rotation angle position. 3. The cutter bit according to claim 2, wherein the cutter bit provided at the predetermined rotation angle position and the cutter bit provided at the other rotation angle position have different excavation positions of the ground. A shield machine that is fixed to a mounting portion. 4. The shield machine according to claim 1, further comprising: a plurality of rotary mounting portions; and a plurality of driving means for rotating the plurality of rotary mounting portions. 5. The group of fixed cutter bits according to claim 1, wherein the plurality of cutter bits is a group of fixed cutter bits fixed to the cutter head and a group of rotary cutter bits fixed to the rotary mounting portion. Wherein the driving means rotates the rotary mounting portion, forms a plurality of preceding excavation grooves in the ground using the rotary cutter bit group, at least a part of the fixed cutter bit group The cutter excavator is characterized in that the cutter bit group is formed so as to cut out and excavate a protruding portion of the ground remaining in the ground between the preceding excavation grooves in a solid state. 6. The plurality of cutter bits according to claim 1, wherein the plurality of cutter bits are a group of fixed cutter bits fixed to the cutter head and a group of rotary cutter bits fixed to the rotary mounting portion. The driving means rotates the rotary mounting portion, and forms a plurality of preceding excavation grooves in the ground using a part of the rotary cutter bit group of cutter bit groups,
Shield excavation characterized by cutting out and excavating in a solid state the protruding portion of the ground remaining between the preceding excavation grooves formed in the ground using another cutter bit group of the rotating cutter bits. Machine. 7. The fixed cutter bit group according to claim 5, wherein the fixed cutter bit group includes a plurality of cutter bit groups that form a plurality of prior excavation grooves in the ground, and a preceding excavation groove formed in the ground. A cutter bit group for cutting out and excavating the protruding portion of the ground left in the solid state in a solid state.