JP2004183303A - Shield excavating equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide shield excavating equipment which facilitates a switching operation from the process of excavating an excavated hole with a large cross section to the process of excavating an excavated hole with a small cross section, and which can suppress the occurrence of the irregularities of the inner wall surface of the excavated hole with the large cross section by preventing a gap from being made between excavation ranges. <P>SOLUTION: This shield excavating equipment 10 enables the excavated hole with the large cross section to be excavated by a first excavator 11 and a second excavator 12, and makes the second excavator 12 separated for excavation from the first excavator 11, so as to enable the excavation of the excavated hole with the small cross section. The first excavator 11 is equipped with a first cutter head 23 which makes a parallel link motion by using an eccentric multispindle 25; the second excavator 12 is equipped with a second cutter head 43 which is arranged in a position deviated forward or backward in an excavation direction with respect to the cutter head 23; and a first excavation range 26, which is excavated by the cutter head 23, and a second excavation range 46, which is excavated by the cutter head 43, partially overlap each other in a front view. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a shield excavator for continuously excavating a large-section excavation hole by changing a cross section from a large-section excavation hole to a small-section excavation hole, and separating a part of an excavator for excavating a large-section excavation hole from another part. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator for excavating a small-diameter excavation hole by excavating.
[0002]
[Prior art]
Conventionally, as a shield drilling device for drilling a large-section drilling hole and drilling a small-section drilling hole from a predetermined position, an excavator having a substantially crescent-shaped main body cutter head that performs parallel link movement with eccentric multi-axis. There is also known a two-stage shielded excavator that combines an excavator equipped with a circular split cutter head that rotates by a single axis (for example, see Patent Document 1).
[0003]
In such a two-stage excavator, the main body cutter head excavates a region corresponding to a substantially crescent shape by performing parallel link motion by eccentric multi-axis. By excavating the area, a substantially crescent-shaped area adjacent to this excavation area can be excavated with the main body cutter head, a large cross section excavation hole is excavated with the main body cutter head and the split cutter head, and It is possible to excavate a circular small-section excavation hole by separating and excavating the split cutter head.
[0004]
However, in this excavator, since the excavation range of the main body cutter head and the excavation range of the split cutter head are adjacent to each other, the main body cutter head performing the parallel link motion must be brought as close as possible without contacting the split cutter head. For example, there is a disadvantage that a gap is easily generated between the digging range of the main body cutter head and the digging range of the split cutter head.
[0005]
Moreover, the excavation range of the main body cutter head is a range in which a substantially crescent shape is moved in parallel, and the excavation range of both ends of the substantially crescent shape is also limited to a range in which the portion is rotated. Therefore, when excavating a large cross-section drilling hole, the periphery of the excavation range of the split cutter head and the periphery of the excavation range of both ends of the main body cutter head cannot be made continuous without irregularities, and the There is also a drawback that an uneven portion is formed on the inner wall surface.
[0006]
In addition, a gap is hardly generated between the excavation ranges of the plurality of cutter heads, and a body-side cutter head that performs parallel link motion by eccentric multi-axis and parallel link motion by eccentric multi-axis as an underground excavator that is continuous without unevenness. There is also known a two-stage shielded excavator that includes a split cutter head and that integrally drives the main body side cutter head and the split cutter head (see, for example, Patent Document 2).
[0007]
Such a shield excavator can form a large cross-section excavation hole by integrally moving the main body-side cutter head and the split cutter head. And no gap was formed between the two excavation areas, and it was difficult to form irregularities on the inner wall surface of the large-section excavation hole continuously without irregularities.
[0008]
[Patent Document 1]
JP-A-2000-2078.
[0009]
[Patent Document 2]
Japanese Patent No. 3167293.
[0010]
[Problems to be solved by the invention]
However, in such a shield excavator, the main body-side cutter head and the split cutter head are connected to each other by a connecting member, or by synchronizing the respective drive units, so that the main body-side cutter head and the split cutter head are mutually driven. Since it is necessary to drive them integrally so that they do not come into contact with each other, the configuration of the drilling equipment tends to be complicated. In order to separate and excavate some of the other cutter heads from the other cutter heads, it takes a lot of time and labor, resulting in poor working efficiency.
[0011]
In view of the above, the present invention makes it easy to switch from the excavation step of the large-section excavation hole to the excavation step of the small-section excavation hole, and to form the inner wall surface of the large-section excavation hole without forming a gap between the excavation ranges. An object of the present invention is to provide a shield excavator capable of suppressing occurrence of unevenness.
[0012]
[Means for Solving the Problems]
The invention according to claim 1, which achieves the above object, is capable of excavating a large-diameter excavation hole by using a first excavator and a second excavator, and further comprising the second excavator from the first excavator. A shield excavator capable of excavating a small section excavation hole by separating and excavating the first excavator, wherein the first excavator includes a first cutter head that performs parallel link motion with eccentric multi-axis, and The excavator includes a second cutter head disposed at a position shifted forward or rearward in the excavation direction with respect to the first cutter head, and includes a first excavation range by the first cutter head and the second cutter. The second excavation range of the head is configured to partially overlap in a front view.
[0013]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the first cutter head has a concave portion when viewed from the front, and the second cutter head is configured such that the second excavation area overlaps the concave portion. The cutter head is disposed.
[0014]
Further, in the invention according to claim 3, in addition to the configuration according to claim 2, a side portion of the concave portion of the first cutter head is displaced so as to expand the concave portion wider than the small section excavation hole. It is characterized by being constituted possible.
[0015]
According to a fourth aspect of the present invention, in addition to the configuration of any one of the second and third aspects, the second cutter head is configured to perform a parallel link motion with an eccentric multi-axis. It is characterized by.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0017]
1 to 7 show this embodiment.
[0018]
In the figure, reference numeral 10 denotes a parent-child shield excavator of the present embodiment, which includes a parent shield excavator 11 as a first excavator and a second excavator detachably coupled to the parent shield excavator 11. Child excavator 12.
[0019]
As shown in FIG. 1 and FIG. 2, the parent shield excavator 11 has a cylindrical parent shield body 20 disposed in a large section excavation hole, and is disposed in front of the parent shield body 20 in the excavation direction. It has a parent shield partition 21 having a circular outer shape when viewed, and a parent shield hood portion 22 which is integrated with the parent shield body 20 in front of the parent shield partition 21.
[0020]
A parent cutter head 23 as a substantially crescent-shaped first cutter head having an arc-shaped concave portion 23a and an arc-shaped outer peripheral portion 23b having a larger diameter than the concave portion 23a is provided in front of the parent shield partition wall 21 in the excavation direction. Are located. The parent cutter head 23 is capable of parallel link movement by a parent drive unit 24 fixed to the parent shield partition 21 and an eccentric multi-axis parent crank mechanism 25 having a large number of eccentric shafts.
[0021]
The parent excavation range 26 as the first excavation range in which the parent cutter head 23 can excavate by the parallel link motion is inside the parent shield body 20 in a front view, and the parent excavation range excavated by the outer peripheral portion 23b. The outer peripheral edge 26 is configured to be the peripheral edge of the parent shield body 20. In addition, a parent shield gate 28 is provided below the parent shield partition 21, and a parent screw conveyor 29 for carrying out the excavated earth and sand is connected thereto.
[0022]
The parent cutter head 23 is formed by fixing a large number of cutter bits 23d for excavating the ground to a frame member 23c, and includes a cutter body 31 to which a parent crank mechanism 25 is connected, and recesses 23a arranged on both sides of the cutter body 31. And a jack 33 and a slide portion 34 which connect the overcutter 32 to the cutter body 31 so as to be able to be separated from the overcutter 32 as a pair of side portions. The width of the concave portion 23a can be expanded or contracted by moving the over cutter 32 apart from and coming into contact with the jack 33 and the slide portion 34.
[0023]
On the other hand, when the child shield excavator 12 is coupled to the parent shield excavator 11, as shown in FIGS. 1 and 2, the child shield excavator 12 has a smaller diameter than the parent shield partition 21 and is substantially flush with the parent shield partition 21. And a movable shield hood portion 42 disposed along the periphery of the child shield partition wall 41 while being accommodated inside the parent shield partition wall 21 and the child shield partition wall 41. Is provided. The movable shield hood portion 42 is fixed in a housed state by a hood stopper 42a, and can be slid forward from the child shield partition 41 in the digging direction by removing the hood stopper 42a. In a state where the child shield excavator 12 is coupled to the parent shield excavator 11, the child shield body 40 as shown in FIG. 7 and the like is not mounted.
[0024]
A child cutter head 43 as a second cutter head having a substantially circular shape is provided at a position substantially overlapping with the arc-shaped concave portion 23a of the parent cutter head 23 in a front view and in front of the child shield partition wall 41 in the excavation direction. It is arranged at a position shifted further backward in the excavation direction. The child cutter head 43 is formed by fixing a large number of cutter bits 43b for excavating the ground to a frame member 43a, and includes an eccentric multi-axis having a number of axes eccentric with a child drive unit 44 fixed to the child shield partition 41. The parallel link movement is enabled by the child crank mechanism 45.
[0025]
Then, the child excavation range 46 as the second excavation range in which the child cutter head 43 can excavate by the parallel link motion overlaps the concave portion 23a in a front view and partially overlaps the parent excavation range 26 of the parent cutter head 23. It has a substantially circular shape substantially coinciding with the shield body 40. Since the child cutter head 43 is provided with the extended portions 43c protruding from the two front end portions 32a of the parent cutter head 23, the portion to be excavated by the extended portions 43c of the child excavation range 46 is not limited to the parent excavation range. 26 protrudes toward the part to be excavated by the tip 32a of the parent cutter head 23.
[0026]
Further, at the lower part of the child shield partition 41, a child shield gate portion 48 is provided so as to be connectable with a child screw conveyor 49 as shown in FIG. Before separation, the child screw conveyor 49 is closed without being connected.
[0027]
In the state as shown in FIGS. 1 and 2 in which the parent shield excavator 11 and the child shield excavator 12 are combined, a large section excavation hole can be excavated by the parent cutter head 23 and the child cutter head 43. I have. In this connection state, a parent shield elector 52 for arranging the parent shield segment 51 is provided on the inner wall surface of the large section excavation hole behind the parent shield body 20 in the excavation direction. 51 are arranged in order. Further, a parent shield jack 54 is fixed to the rear of the parent shield body 20 in the excavation direction, and a parent-child shield excavation including the parent shield excavator 11 and the child shield excavator 12 is performed by a reaction force pressing the parent shield segment 51. The entire device 10 is configured to move forward in the excavation direction.
[0028]
In order to excavate a large section excavation hole by the parent-child shield excavator 10 having such a configuration, first, as shown in FIGS. 1 and 2, the parent shield excavator 11 and the child shield excavator 12 are connected. While pressing in the excavation direction by the parent shield jack 54, the parent cutter head 23 is moved in parallel by the parent drive unit 24 and the parent crank mechanism 25, and the child cutter head 43 is moved by the child drive unit 44 and the child crank mechanism 45. This is performed by driving independently of the parent cutter head 23 to perform a parallel link motion.
[0029]
At this time, the pair of over cutters 32 of the parent cutter head 23 are in the state of being closest to the cutter body 31 by the jack 33 and the slide portion 34, and the concave portion 23a is in the state of being most contracted. Here, the range of the parent excavation range 26 is excavated by the parent cutter head 23, and an unexcavated portion corresponding to the concave portion 23 a is formed in the parent excavation range 26 of the parent cutter head 23. Therefore, this unexcavated portion is excavated by the child cutter head 43.
[0030]
At this time, since the parent excavation range 26 of the parent cutter head 23 and the child excavation range 46 of the child cutter head 43 partially overlap the child excavation range 46, no gap is formed between the two excavation ranges 26, 46. Further, a portion formed by the extended portion 43c on the periphery of the child excavation region 46 and a portion formed by the tip portion 32a of the over cutter 32 on the periphery of the parent excavation region 26 intersect, but formed at the intersection. The irregularities formed are small, and have a continuous shape with substantially no inflection points. Therefore, the inner wall surface of the large-section excavation hole is formed in a predetermined circular cross-sectional shape.
[0031]
Further, in this embodiment, the child shield excavator 12 is equivalent to a conventional single-circle eccentric multi-axis shield machine, but the over cutter head is also known to the child cutter head 43 similarly to the parent cutter head 23. It is possible to incorporate the over cutter head into the child cutter head 43 and excavate it in an expanded state to further reduce the unevenness formed at the intersection.
[0032]
Next, when the large section excavation hole is excavated to the predetermined position, the excavation step of the large section excavation hole is switched to the excavation step of the small section excavation hole, and the small section excavation hole is excavated.
[0033]
At the time of switching, the excavation by the parent-child shield excavator 10 is first stopped, and the parent cutter head 23 is arranged at the lowermost position of the parallel link motion as shown in FIG. At this time, it is preferable to arrange the child cutter head 43 at the uppermost position of the parallel link movement.
[0034]
In this state, as shown in FIG. 3, the over cutter 32 is moved to the position farthest from the cutter body 31 by the jack 33 and the slide portion 34, and the concave portion 23a is expanded. As a result, the inner edge of the concave portion 23a expands larger than the cross-sectional shape of the small-section excavation hole.
[0035]
Then, as shown in FIG. 4, the reaction force receiving bracket 62 is fixed at a position corresponding to the child shield excavator 12 on the parent shield trunk 20 behind the child shield trunk 40 in the excavation direction. Further, the parent shield gate portion 28 is closed, and members unnecessary for excavating the small section excavation holes such as the parent screw conveyor 29, the parent shield elector 52, and the parent shield jack 54 mounted on the parent shield partition 21 are dismantled and removed. .
[0036]
Further, the hood stopper 42a is removed, the movable shield hood part 42 is slid forward from the periphery of the child shield partition wall 41 in the digging direction, and a part of the child shield body part 40 is mounted. In addition, a seal 58 is attached so that water does not enter the machine from around the child shield body 40.
[0037]
Further, the child screw conveyor 49 is connected to the child shield gate portion 48 provided on the child shield partition wall 41 to be opened, and the temporary shield jack 64 is attached to the reaction force receiving bracket 62. Here, the parent screw conveyor 29 can be diverted as the child screw conveyor 49, and the cost can be reduced.
[0038]
In this state, the fixing device 65 connecting the child shield excavator 12 and the parent shield excavator 11 is removed, and the child shield excavator 12 is separated from the parent shield excavator 11.
[0039]
Then, while being pressed by the temporary shield jack 64, the child cutter head 43 is caused to perform a parallel link motion by the child drive unit 44 and the child crank mechanism 45, thereby temporarily starting the child shield excavator 12.
[0040]
Next, as shown in FIG. 5, while the temporary support 66 is sequentially added between the temporary shield jack 64 and the pressing portion 12a of the child shield excavator 12, excavation by the child cutter head 43 is gradually continued.
[0041]
At this time, the child cutter head 43 disposed rearward in the excavation direction of the parent cutter head 23 passes substantially inside the recess 23a of the parent cutter head 23 and moves forward in the excavation direction of the parent cutter head 23 by excavation. At this time, since the over cutter 32 of the parent cutter head 23 is wider than the predetermined small-section excavation hole, even if the child cutter head 43 passes through the concave portion 23a of the parent cutter head 23 while performing parallel link movement. Do not abut.
[0042]
Then, as shown in FIG. 6, at the stage when the child shield excavator 12 has excavated a predetermined amount, the remaining part of the child shield body 40 is attached, and the temporary shield jack 64, the reaction force receiving bracket 62, and the temporary support 66 are removed. The child shield jack 69 is fixed to the child shield body 40. Further, the child shield elector 72 is mounted, and the child shield segments 71 are sequentially installed on the inner wall surface of the small section digging hole excavated by the child cutter head 43.
[0043]
In addition, in the gap between the parent shield excavator 11 and the child shield segment 71, an injection material is injected and solidified to ensure the water stoppage and to make the connection stronger.
[0044]
The small-section excavation hole is excavated by continuing excavation by the child shield excavator 12.
[0045]
According to the parent-child shield excavator 10 capable of excavating a large section excavation hole and a small section excavation hole as described above, the parent shield excavator 11 controls the parent cutter head 23 that performs parallel link motion with eccentric multi-axis. And the child shield excavator 12 includes the child cutter head 43 disposed at a position shifted from the parent cutter head 23 in the excavation direction, so that the parent cutter head 23 and the child cutter head 43 are driven independently. Parallel link motion. Therefore, there is no need to synchronize the operations of the cutter heads 23 and 43, and the configurations of the parent shield excavator 11 and the child shield excavator 12 can be simplified. At the same time, when switching from the excavation process of the large-section excavation hole to the excavation process of the small-section excavation hole, the parent shield excavator 11 and the child shield excavator 12 can perform the parent shield excavation only by a simple operation such as removing the connecting member 65 or the like. The state of connection between the excavator 11 and the child shield excavator 12 can be easily released, and the child shield excavator 12 can be easily separated from the parent shield excavator 11 to improve the working efficiency.
[0046]
Moreover, since the parent excavation range 26 by the parent cutter head 23 and the child excavation range 46 by the child cutter head 43 are configured to partially overlap in a front view, the distance between the parent excavation range 26 and the child There is no gap in the space. In addition, since the parent excavation area 26 and the child excavation area 46 partially overlap, the periphery of the parent excavation area 26 and the periphery of the child excavation area 46 can intersect. In comparison, the unevenness formed in that portion can be reduced. Moreover, by adjusting the overlapping state, it is possible to smoothly adjust the angle at which the peripheral edges of both excavation areas 26 and 46 intersect. For this reason, it is possible to suppress irregularities that occur on the inner wall surface of the large-section excavation hole at the portion where the periphery of the parent excavation area 26 and the periphery of the child excavation area 46 intersect.
[0047]
In addition, since the parent cutter head 23 has a concave portion 23a in a front view, and the child cutter head 43 is arranged so that the concave portion 23a and the child excavation range 46 overlap, a large cross section formed by the parent cutter head 23 is provided. It is easy to form a small cross-section drilling hole in the peripheral part of the drilling hole, and at the same time, it is possible to form a large cross-section drilling hole with a smooth circular cross-section by suppressing the occurrence of irregularities by the parent cutter head 23 and the child cutter head 43. It is.
[0048]
Further, since the over cutter 32, which is a side portion of the concave portion 23a of the parent cutter head 23, can be displaced so as to expand the concave portion 23a wider than the small-section digging hole, the small-section digging is performed from the large-section digging hole digging step. When switching to the hole excavation process, it is easy to pass the members such as the child cutter head 43 and the child shield segment 71 for excavating the small section excavation hole from the rear in the excavation direction of the parent cutter head 23 to the front. Therefore, the overlapping part of the child excavation area 46 with respect to the parent excavation area 26 can be increased, and the edge of the parent excavation area 26 and the edge of the child excavation area 46 can intersect with less unevenness. The unevenness of the inner wall surface of the cross-section excavation hole can be further suppressed.
[0049]
In addition, since the child cutter head 43 is configured to perform parallel link motion with the eccentric multi-axis, the size of the child cutter head 43 with respect to the child excavation range 46 can be reduced, and the excavation direction of the parent cutter head 23 can be reduced. The child cutter head 43 can be easily passed forward from the rear through the concave portion 23a.
[0050]
In this case, when the over cutter head is incorporated in the child cutter head 43 similarly to the parent cutter head 23, the size of the child cutter head 43 can be reduced by contracting the over cutter head. The cutter head 43 can be easily passed from the rear in the excavation direction of the parent cutter head 23 to the front.
[0051]
In the above-described embodiment, the cross section of the large-section excavation hole has a circular shape. However, the shapes of the large-section excavation hole and the small-section excavation hole in front view can be appropriately selected. By using the cutter head described above, it is possible to obtain a formation obtained by the parallel link motion of the cutter head, and it is possible to appropriately select a shape such as a rectangle or an ellipse.
[0052]
For example, as shown in FIG. 8 and FIG. 9, a large-section excavation hole and a small-section excavation hole can have a shape in which a part of a circular shape projects outward when viewed from the front. A concave portion 75 can be provided in a part of the inner wall surface of the large section excavation hole and the small section excavation hole, and a space is provided in a part between the concave section 75 and the parent shield segment 51 and the child shield segment 71 having a constant curvature. By forming the backing material 76 and injecting the backfilling material into this portion, the structures of the shield segments 51 and 71 can be connected more firmly.
[0053]
Further, for example, if the parent cutter head 23 is rectangular, the recess 75 is rectangular, and the child cutter head 43 is rectangular, it is possible to excavate an excavation hole having a large rectangular cross section and to excavate a rectangular small cross section. It is possible to drill holes.
[0054]
Further, in the above-described embodiment, the example in which the child cutter head 43 is arranged behind the parent cutter head 23 in the excavation direction is described. However, the child cutter head 43 may be arranged ahead of the parent cutter head 23 in the excavation direction. is there. In this case, it is preferable to dispose the child cutter head 43 in the concave portion 23a of the parent cutter head 23. Further, this concave portion 23a can be expanded outside the small section excavation hole as in the above-described embodiment. Is preferred. This allows the child shield segment 71 to pass through the concave portion 23a of the parent cutter head 23 and to be continuously arranged in the small-section excavation hole.
[0055]
Further, in the above description, one parent shield excavator 11 and one child shield excavator 12 are used, but the number of each of the excavators 11 and 12 is not limited, and one or both of them may be provided in plurality.
[0056]
In the above description, the parent cutter head 23 of the parent shield excavator 11 and the child cutter head 43 of the child shield excavator 12 are configured to be rotationally driven in the same direction during the parallel link movement, but in the opposite direction. May be rotationally driven. Further, the turning radius of the parent cutter head 23 and the turning radius of the child cutter head 43 may be the same or different.
[0057]
In the above description, the child shield excavator 12 is disposed at the upper end of the parent shield excavator 11, but the position of the child shield excavator 12 with respect to the parent shield excavator 11 can be appropriately selected. It may be an end. Furthermore, the central portion may be provided, and even in such a case, an effect is obtained in which no gap is formed between the parent excavation range 26 and the child excavation range 46.
[0058]
Furthermore, in the above-mentioned parent-child shield excavation apparatus 10, a mud pressure type is used as a stabilization method for the cutting edge.
[0059]
【The invention's effect】
As described in detail above, according to the present invention, it is possible to excavate a large section excavation hole by the first excavator and the second excavator, and to separate and excavate the second excavator from the first excavator. Digging hole capable of digging a small section digging hole, the first digging machine has a first cutter head that performs parallel link motion with eccentric multi-axis, and the second digging machine excavates with respect to the first cutter head. Since the second cutter head is disposed at a position shifted forward or backward in the direction, the first cutter head and the second cutter head can be driven independently of each other, and it is necessary to synchronize the two. Therefore, the configuration of the first and second excavators can be simplified, and when switching from the excavation process of the large-section excavation hole to the excavation process of the small-section excavation hole, the first Easy to separate the excavator, Easy to improve the work efficiency.
[0060]
In addition, since the first excavation range by the first cutter head and the second excavation range by the second cutter head are configured to partially overlap in a front view, between the first excavation range and the second excavation range. There is no gap, and at the portion where the periphery of the first excavation area and the periphery of the second excavation area intersect, it is possible to suppress the unevenness generated on the inner wall surface of the large-section excavation hole, and to form the inner wall surface with less unevenness It is possible to provide a shield excavator that is easy to perform.
[0061]
According to the second aspect of the present invention, the first cutter head has a concave portion in a front view, and the second cutter head is disposed so that the second excavation area overlaps the concave portion. With the cutter head and the second cutter head, a circular cross section or a rectangular cross section can be excavated, and at this time, it is difficult to form irregularities on the inner wall surface.
[0062]
Furthermore, according to the third aspect of the present invention, since the side of the concave portion of the first cutter head is configured to be displaceable so as to expand the concave portion wider than the small-section digging hole, the large-section digging hole is provided. When switching from the excavation step of the first cutter head to the excavation step of the small section excavation hole, it is easy to pass a member for excavation of the small section excavation hole from the rear in the excavation direction of the first cutter head, and the second excavation range with respect to the first excavation area Can be increased, the edge of the first excavation area and the edge of the second excavation area can intersect with less unevenness, and the inner wall surface of the large section excavation hole Unevenness can be further suppressed.
[0063]
According to the fourth aspect of the present invention, since the second cutter head is configured to perform parallel link motion with eccentric multi-axis, the size of the second cutter head with respect to the second excavation range is reduced. When the second cutter head is provided with an over cutter head, the size of the second cutter head can be further reduced, and the second cutter head can be easily passed forward from the back of the first cutter head in the digging direction.
[Brief description of the drawings]
FIG. 1 is a front view of a shield excavator according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the shield excavator according to the embodiment.
FIG. 3 is a front view showing a switching state of the shield excavator according to the embodiment, showing a state in which a concave portion is expanded.
FIG. 4 is a cross-sectional view illustrating a switching state of the shield excavator according to the embodiment, and illustrates a starting state of excavation of the child cutter head.
FIG. 5 is a cross-sectional view showing a switching state of the shield excavator according to the embodiment, showing a state where the child cutter head has moved forward in the excavation direction of the parent cutter head.
FIG. 6 is a cross-sectional view showing a switching state of the shield excavator according to the embodiment, showing a state where the assembly of the child shield excavator is completed.
FIG. 7 is a cross-sectional view showing a switching state of the shield excavator of the embodiment, showing a normal excavation state of a small-section excavation hole.
FIG. 8 is a front view of a shield excavator according to another embodiment.
FIG. 9 is a sectional view of the shield excavator of the embodiment.
[Explanation of symbols]
10 Parent-child shield excavator
11 Parent shield excavator (first excavator)
12 Child shield excavator (second excavator)
20 Parent shield body
23 Parent cutter head (first cutter head)
23a recess
25 Parent crank mechanism
26 Parent Excavation Area (First Excavation Area)
31 cutter body
32 over cutter (side)
40 Child Shield Body
43 Child cutter head (second cutter head)
45 child crank mechanism
46 Child excavation area (second excavation area)

Claims (4)

The first excavator and the second excavator can excavate a large section excavation hole, and the small excavation hole is excavated by separating and excavating the second excavator from the first excavator. A possible shield drilling rig,
The first excavator includes a first cutter head that performs parallel link motion with an eccentric multi-axis, and the second excavator is displaced forward or rearward in the excavation direction with respect to the first cutter head. A second cutter head disposed at
A shield excavator, wherein a first excavation range of the first cutter head and a second excavation range of the second cutter head partially overlap in a front view. 2. The shield excavator according to claim 1, wherein the first cutter head has a concave portion in a front view, and the second cutter head is arranged such that the second excavation area overlaps the concave portion. 3. The shield excavating device according to claim 2, wherein a side portion of the concave portion of the first cutter head is configured to be displaceable so as to expand the concave portion wider than the small-section excavation hole. 4. The shield excavator according to claim 2, wherein the second cutter head is configured to perform parallel link motion with eccentric multi-axis. 5.

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