JP6838972B2 - Elector, tunnel excavator, and shield construction method - Google Patents

Description

The present invention relates to an erector, a tunnel excavation device including the erector, and a shield construction method using the erector.

In the shield method, the ground is excavated by a tunnel excavator, and a plurality of segments are connected in a ring along the surface of the excavated ground to construct a shield. As the device for arranging the segments in this way, for example, an erector provided at the rear end of the tunnel excavation device as described in Patent Document 1 is used.

5 and 6 show a conventionally used Elector, FIG. 5 is a vertical cross-sectional view, and FIG. 6 is an elevation view seen from the rear in the tunnel excavation traveling direction. As shown in FIGS. 5 and 6, the Elector 100 has an annular swivel member 102, a pair of radial jacks 108 attached to both sides of the swivel member 102 and expandable and contractible in the radial direction, and a radial jack 108. An annular bridge member 110 provided so as to connect the tips of the pair of radial jacks 108, and an axial jack 112 provided in the center of the bridge member 110 and expandable and contractible in the tunnel excavation progress direction. A fixing member 114, which is attached to the tip of the axial jack 112 and can fix the segment, is provided. Further, the pinion gear 106 attached to the motor 104 is fitted with the gear 102A formed on the outer peripheral surface of the swivel member 102. As a result, the swivel member 102 can be rotated by rotating the motor 104. Further, by expanding and contracting the radial jack 108 and the axial jack 112, the fixing member 114 can be moved in the radial direction and the axial direction.

When arranging the segments, first, as shown in FIG. 5, a new segment 120B is conveyed onto the frontmost segment 120A which is already connected in an annular shape. Then, the radial jack 108 and the axial jack 112 are expanded and contracted to arrange the fixing member 114 in the vicinity of the segment 120B, and the segment 120B is fixed to the fixing member 114. Next, the axial jack 112 is contracted until the rear surface of the segment 120B coincides with the front surface of the segment 120A. Then, the swivel member 102 is rotated to a predetermined angle, the radial jack 108 is extended, and the outer surface of the segment 120B is brought into contact with the inner surface of the tunnel. By repeating these operations, the shield can be constructed by connecting the segments 120B adjacent to each other in the circumferential direction and the front-rear direction while arranging the segments 120B in an annular shape.

Japanese Unexamined Patent Publication No. 2001-288998

Here, in the conventional Elector 100, since the bridge member 110 crosses the inside of the swivel member 102, it is difficult to effectively use the space inside the swivel member 102. Further, the new segment 120B is transported above the segment 120A in which the standing up is completed. Therefore, it is difficult to effectively use the inner space of the shield.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an erector capable of effectively utilizing an internal space.

The present invention is an elector for constructing a shield by connecting a plurality of divided segments in an annular shape, and is a ring-shaped rotating member that can rotate around a central axis and a center from the ring-shaped rotating member. A plurality of gripping members provided corresponding to a plurality of segments, which extend in the axial direction and sandwich and grip the front and rear of the segment from the inside in the radial direction, are provided , and the gripping member includes an arm portion extending in the central axial direction. , An actuator provided on the radial outside of the arm and capable of advancing and retreating toward the tip side, and a state provided on the tip side of the arm and extending along the central axis, are outside the radial direction. It is characterized by having a lever that can rotate to a state of extending toward the direction.

According to the present invention having the above configuration, since the gripping member extends from the annular rotating member in the central axial direction and grips the front and rear of the segment by sandwiching the front and rear segments from the inside in the radial direction, the gripping member does not advance to the inside of the annular rotating member. .. Therefore, the inner space of the ring rotating member can be effectively used.

According to the present invention having the above configuration, the segment can be gripped from the inside in the radial direction by driving the actuator and the lever.

The tunnel excavator of the present invention is provided with the above-mentioned erector at the rear end.

The shield construction method of the present invention is a method of constructing a shield by connecting a plurality of divided segments in an annular shape, that is, an annular rotating member that can rotate around a central axis and an annular rotating member. Using an erector including a plurality of gripping members provided corresponding to a plurality of segments, which extend from the center axis direction and sandwich the front and rear of the segment from the inside in the radial direction to grip the segments, the gripping members are held in the central axis direction. An arm that extends to, an actuator that is provided on the radial outer side of the arm and is provided on the proximal end side and can move forward and backward toward the distal end side, and a state that is provided on the distal end side of the arm and extends along the central axis. With an arrangement step, gripping member, which has a lever that can rotate from to to a state that extends outward in the radial direction, and places a new segment in front of the Elector at intervals from the already constructed shield. By repeating the gripping step of gripping the arranged segments from the front-rear direction with the actuator and the lever and the rotation step of rotating the annular rotating member at a predetermined angle, a plurality of segments are formed in the circumferential direction by the plurality of gripping members. It is characterized by including a step of holding the segments so as to be aligned with each other and a step of connecting a plurality of segments arranged in an annular shape.

According to the present invention having the above configuration, in order to rotate the annular rotating member after holding the new segment by the gripping member, the next new segment is arranged without overlapping the shield already constructed in front of the elector. be able to. Therefore, it is not necessary to arrange a new segment inside the shield in the radial direction, and the inner space can be effectively used.

According to the present invention, it is possible to provide an erector capable of effectively utilizing the internal space.

It is sectional drawing which shows the tunnel excavation apparatus by one Embodiment of this invention. It is a perspective view which shows the erector of the tunnel excavation apparatus shown in FIG. It is a vertical sectional view which shows the Elector of the tunnel excavation apparatus shown in FIG. It is a figure for demonstrating the method of constructing a shield by connecting the segments in an annular shape by the Elector shown in FIG. FIG. 5 is a vertical cross-sectional view showing a conventionally used Elector. FIG. 6 is an elevational view of the conventionally used Elector as viewed from behind in the direction of tunnel excavation.

Hereinafter, an embodiment of the Elector of the present invention, a tunnel excavation device including the Elector, and a shield construction method using the Elector will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional perspective view showing a tunnel excavator according to an embodiment of the present invention. As shown in the figure, the tunnel excavator 1 includes a cylindrical shell 2, an excavation portion 4 in which bits are arranged on an annular rotating surface provided at the tip of the shell 2, and the shell 2. A shield jack 6 provided at the rear portion and an erector 8 provided at the rear portion of the shell body 2 are provided. Further, a heavy machine 10, a crusher 12, and a conveyor 14 are arranged in the shell 2. The tunnel excavator 1 excavates the ground in an annular shape by rotating the excavation portion 4 while extending the shield jack 6 while taking a reaction force against the shield 16 already constructed. Then, the ground with an annular excavated inner circular cross section is excavated by the heavy machine 10, and the excavated soil is crushed by the crusher 12. The earth and sand and gravel generated by crushing the ground are conveyed to the rear of the tunnel excavator 1 by the conveyor 14. In this way, a tunnel with a circular cross section can be constructed. Further, as the excavation of the tunnel progresses, the segments are connected by the Elector 8 to construct a new shield 16. Regarding more detailed tunnel excavation methods, Japanese Patent Application No. 2014-109704 (Japanese Patent Laid-Open No. 2015-155634) and Japanese Patent Application No. 2012-142389 (Japanese Patent Laid-Open No. 2014-005677) filed by the applicant so far have been filed. It is described in.

2 and 3 show an elector of the tunnel excavator shown in FIG. 1, FIG. 2 is a perspective view, and FIG. 3 is a vertical sectional view. As shown in FIGS. 2 and 3, the Elector 8 includes an annular rotating member 20 that can rotate around a central axis, a driving device 22 for rotating the annular rotating member 20, and an annular rotating member. A gripping member 24 extending rearward along the central axis from 20 is provided.

The annular rotating member 20 is rotatably held by a support member 26 attached to the inner surface of the shell 2. A swivel gear 20A is formed on the outer surface of the annular rotating member 20. Further, the drive device 22 includes a speed reducer 22A with a motor and a swivel pinion 22B, and the swivel pinion 22B is fitted with a swivel gear 20A of the ring rotating member 20. Thereby, by driving the speed reducer 22A with a motor, the annular rotating member 20 can be rotated around the central axis.

The gripping member 24 is provided corresponding to a plurality of segments constituting the shield. That is, in the present embodiment, since the shield is constructed by connecting the six long annular segments and one short annular segment, six grips which are the same number as the long segments are gripped. A member 24 is provided.

Each grip member 24 is fixed to a support member 28 fixed to the annular rotating member 20 so as to extend rearward, an arm portion 32 extending rearward from the support plate 28B of the support member 28, and a branch portion 28A of the support member 28. The first actuator 30 is provided, a lever 34 rotatably provided at the tip of the arm portion 32, and a second actuator 36 housed in the arm portion 32.

The support member 28 is provided at the rear end of the main body portion 28C extending rearward, the branch portion 28A extending radially outward from the center of the main body portion 28C, and the main body portion 28C, and extends outward in the radial direction. It has a support plate 28B.

The first actuator 30 is fixed in a state where the cylinder is fixed to the branch portion 28A of the support member 28 and the piston is inserted into the support plate 28B. The first actuator 30 can move the piston backward and backward along the central axis. The first actuator 30 is located on the outer side of the arm portion 32 in the radial direction.

The front end portion of the arm portion 32 is attached to the support plate 28B at a position radially outward from the main body portion 28C and radially inward with respect to the first actuator 30.

The lever 34 is rotatably attached to the rear end of the arm 32. Further, the lever 34 is rotated from a state of extending backward along the central axis to a state of extending outward in the radial direction by expanding and contracting the second actuator 36, as shown in FIG. Can be done.

With such a configuration, the gripping member 24 extends the first actuator 30, and the second actuator 36 rotates the lever 34 so as to extend outward in the radial direction, whereby the first actuator 30 The tip and the lever 34 can sandwich and hold the segment from the front-rear direction on the radial outer side of the arm portion 32.

FIG. 4 is a diagram for explaining a method of constructing a shield by connecting segments in an annular shape by the elector shown in FIG.
In order to connect the segments in an annular shape, first, the first new segment 40A is conveyed to the lower rear part of the Elector 8. At this time, the new segment 40A is spaced from the already constructed shield 16 so that the lever 34 can be rotated when the segment 40A is gripped by the gripping member 24 as described later. Transport to the front position of 8. Next, the first and second actuators 30 and 36 of the gripping member 24 are driven, and the segment 40A is sandwiched and gripped from the front and rear by the first actuator 30 and the lever 34 (FIG. 4A). Then, by driving the speed reducer 22A with a motor, the annular rotating member 20 is rotated in a predetermined direction by an angle corresponding to the arcuate segment 40A.

Next, the second new segment 40B is transported to the lower rear part of the Elector 8. Then, the first and second actuators 30 and 36 of the gripping member 24 are driven, and the segment 40B is sandwiched and gripped from the front and rear by the first actuator 30 and the lever 34 (FIG. 4B). Then, by driving the speed reducer 22A with a motor, the annular rotating member 20 is rotated in a predetermined direction by an angle corresponding to the arcuate segment 40B.

Next, the third new segment 40C is conveyed to the lower rear part of the Elector 8. Then, the first and second actuators 30 and 36 of the gripping member 24 are driven, and the segment 40C is sandwiched and gripped from the front and rear by the first actuator 30 and the lever 34 (FIG. 4 (C)). Then, by driving the speed reducer 22A with a motor, the annular rotating member 20 is rotated in a predetermined direction by an angle corresponding to the arcuate segment 40C.

Next, the fourth new segment 40D is transported to the lower rear part of the Elector 8. Then, the first and second actuators 30 and 36 of the gripping member 24 are driven, and the segment 40D is sandwiched and gripped from the front and rear by the first actuator 30 and the lever 34 (FIG. 4 (D)). Then, by driving the speed reducer 22A with a motor, the annular rotating member 20 is rotated in a predetermined direction by an angle corresponding to the arcuate segment 40D.

Next, the fifth new segment 40E is transported to the lower rear part of the Elector 8. Then, the first and second actuators 30 and 36 of the gripping member 24 are driven, and the segment 40E is sandwiched and gripped from the front and rear by the first actuator 30 and the lever 34 (FIG. 4 (E)). Then, by driving the speed reducer 22A with a motor, the annular rotating member 20 is rotated in a predetermined direction by an angle corresponding to the arcuate segment 40E.

Next, the sixth new segment 40F is conveyed to the lower rear part of the Elector 8. Then, the first and second actuators 30 and 36 of the gripping member 24 are driven, and the segment 40F is sandwiched and gripped from the front and rear by the first actuator 30 and the lever 34 (FIG. 4 (F)). Then, by driving the speed reducer 22A with a motor, the annular rotating member 20 is rotated in a predetermined direction by an angle corresponding to the arcuate segment 40F. As a result, the gripping member 24 holds the six segments 40A to 40F in a state of being arranged in the circumferential direction.

Next, a short annular segment 40G is placed between the first segment 40A and the sixth segment 40F. Then, the adjacent segments 40A to 40G are fixed with bolts or the like. As a result, the segments 40A to 40G are connected in an annular shape.

Next, the tip of the piston of the shield jack 6 of the tunnel excavator 1 is brought into contact with the segments 40A to 40G connected in an annular shape, and the shield jack 6 is extended. As a result, the segments 40A to 40G connected in an annular shape move backward and come into contact with the already constructed shield 16A. Then, the newly set up segments 40A to 40G are connected to the already constructed shield 16A. As a result, a new shield for one ring can be constructed.

As described above, according to the present embodiment, the following effects are achieved.
In the present embodiment, since the gripping member 24 extends from the annular rotating member 20 in the central axial direction and grips the front and rear of the segment by sandwiching the front and rear segments from the inside in the radial direction, the gripping member 24 does not advance to the inside of the annular rotating member 20. Therefore, the inner space of the annular rotating member 20 can be effectively used.

Further, in the present embodiment, the gripping member 24 is provided on the arm portion 32 extending in the central axis direction, the radial outside of the arm portion 32, and the proximal end side, and is capable of advancing and retreating toward the tip end side. It has an actuator 30 and a lever 34 provided on the tip end side of the arm portion 32 and capable of rotating from a state extending along the central axis to a state extending outward in the radial direction. According to the present embodiment, the segment can be gripped from the inside in the radial direction by driving the first actuator 30 and the lever 34.

Further, in the present embodiment, since the segment 40A is held by the gripping member 24 and then the ring rotating member 20 is rotated, the next new segment 40B is arranged without overlapping the shield already constructed in front of the Elector 8. can do. Therefore, it is not necessary to arrange the next new segment 40B inside the shield in the radial direction, and the inner space can be effectively used.

1 Tunnel excavator 2 Shell 4 Excavation part 6 Shield jack 8 Elector 10 Heavy equipment 12 Crushed stone machine 14 Conveyor 16 Shield 20 Ring rotating member 20A Swing gear 22 Kudo equipment 22
22A Reducer with motor 22B Swivel pinion 24 Grip member 26 Support member 28 Support member 28A Branch 28B Support plate 28C Main body 30 First actuator 32 Arm 34 Lever 36 Second actuator

Claims (3)

It is an erector for constructing a shield by connecting a plurality of divided segments in an annular shape.
An annular rotating member that can rotate around the central axis,
A plurality of gripping members provided corresponding to the plurality of segments, which extend from the annular rotating member in the central axis direction and sandwich and grip the front and rear of the segment from the inside in the radial direction, are provided .
The gripping member
The arm extending in the central axis direction and
An actuator provided on the radial outer side of the arm portion and on the proximal end side and capable of advancing and retreating toward the distal end side.
An erector provided on the tip end side of the arm portion and having a lever that can rotate from a state extending along the central axis to a state extending outward in the radial direction. A tunnel excavator provided with the elector according to claim 1 at the rear end. It is a method of constructing a shield by connecting a plurality of divided segments in an annular shape.
An annular rotating member that can rotate around the central axis,
An erector including a plurality of gripping members provided corresponding to the plurality of segments, which extend from the annular rotating member in the central axis direction and sandwich and grip the front and rear of the segment from the inside in the radial direction, is used. ,
The gripping member
The arm extending in the central axis direction and
An actuator provided on the radial outer side of the arm portion and on the proximal end side and capable of advancing and retreating toward the distal end side.
It has a lever provided on the tip side of the arm portion and which can rotate from a state extending along the central axis to a state extending outward in the radial direction.
A placement step, in which a new segment is placed in front of the Elector at intervals from the already constructed shield,
A gripping step in which the segment arranged by the gripping member is gripped from the front-rear direction by the actuator and the lever, and
A rotation step that rotates the ring rotating member at a predetermined angle,
By repeating the process of holding a plurality of segments so as to be lined up in the circumferential direction by a plurality of gripping members,
A shield construction method comprising a step of connecting a plurality of segments arranged in an annular shape.

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