JP6836394B2 - Shape retention device and shield boring machine - Google Patents

Description

The present invention relates to a shape-retaining device for holding the shape of a segment and a shield boring machine including the same.

Generally, a segment is assembled by an elector device on the wall surface of a tunnel excavated by a shield boring machine. A cement-like backfill material is injected between the ground and the segment. A shape-retaining device (also called a perfect circle-retaining device) retains the shape of the segment until the backfill material hardens. In the shield method, the shield tunnel boring machine is dug for one segment, then the segment is assembled in the rear space by the elector device, and then the next segment is dug while maintaining the shape of the segment assembled by the shape holding device. To do. This work is repeated to excavate the tunnel.

A prior art of a shape-retaining device is disclosed in Patent Document 1. In this shape holding device, an upper holding member and a lower holding member which are brought into contact with the inner surface of the segment by vertical stretching means, and a left holding member and a right holding member which are brought into contact with the inner surface of the segment by the left and right stretching means are provided. ing.

Japanese Patent No. 30142383

Certainly, according to the shape holding device of Patent Document 1, the shape of the segment can be stably held against the earth pressure from the vertical direction and the horizontal direction. However, in the case of Patent Document 1, a rod having an actuator for expansion and contraction in the left-right direction is provided, and a horizontal connecting material for supporting the force is provided at the rear part of the main body of the shield excavator (particularly, than at the rear work deck). Cross (above). Therefore, the arrangement space of the equipment mounted on the rear work deck is restricted. In particular, when the shield excavator is a mud pressure type, the arrangement space for excavated earth and sand discharge screw conveyors and hydraulic equipment arranged toward the upper part of the rear work deck is greatly restricted.

Therefore, according to the present invention, the segment can stably hold the shape of the segment against the earth pressure from the vertical direction and the horizontal direction, and at least a sufficient space can be secured above the rear work deck. It is an object of the present invention to provide a shape-retaining device and a shield excavator equipped with the device.

In order to achieve the above object, the segment shape holding device according to the present invention is a shape holding device that holds the circular shape of the segment assembled by the elector device at the rear part of the main body of the shield excavator, and is assembled. A plurality of pressing frames arranged in the circumferential direction so as to press the segment from the inside are provided, and the plurality of pressing frames are at least in contact with or separated from the upper segment. And a side pressing frame that is adjacent to the upper pressing frame and is brought into contact with or separated from the segment on the side, and the lower portion of the side pressing frame is a shape-retaining device. An upper pressing expansion / contraction mechanism that is swingably supported by the configuration and supports the upper pressing frame body against the rear structure of the main body to advance and retreat toward the upper segment, and the upper pressing frame. It is arranged between the body and the side pressing frame, and the gap between the upper pressing frame and the side pressing frame is expanded or contracted to expand or contract the outer peripheral dimension of the plurality of pressing frames. It is equipped with a circumferential expansion / contraction mechanism.

According to this configuration, the upper pressing frame is pressed from the rear structure of the main body of the shield excavator to the upper segment by the upper pressing expansion / contraction mechanism, and the side pressing frame is pressed to the side by the circumferential expansion / contraction mechanism. It is possible to maintain the circular shape of the segment against the earth pressure in the vertical direction and the horizontal direction by generating an expansion force that presses against the segment and presses the segment assembled by these from the inside. Further, since the circular shape is maintained by the expanding force, it is not necessary to provide a reinforcing member that crosses the upper part of the main body of the shield excavator, and a sufficient space can be secured above the rear work deck.

Further, the circumferential expansion / contraction mechanism includes at least an actuator that expands / contracts the gap between the upper pressing frame and the side pressing frame, and the upper pressing frame and the side pressing when the actuator expands / contracts. It may be provided with a guide that allows movement in the circumferential direction relative to the frame body and limits movement in the radial direction.

With this configuration, when the gap is expanded or contracted by the actuator provided between the upper pressing frame and the side pressing frame, the upper pressing frame and the side pressing frame are provided by the guide. Although relative movement in the circumferential direction is allowed, movement inward in the radial direction is restricted, so that the circular shape between the upper pressing frame and the side pressing frame is maintained when the actuator expands and contracts. It can be scaled stably.

Further, the plurality of pressing frames further include a lower pressing frame that is brought into contact with or separated from the lower segment, and these are placed between the side pressing frame and the lower pressing frame. The lower peripheral direction expansion / contraction mechanism may be provided by expanding / contracting the gap of the pressing frame body to expand / contract the outer peripheral dimension of the plurality of pressing frame bodies.

With this configuration, even in a configuration including a lower pressing frame, the gap is expanded or contracted by a lower circumferential expansion / contraction mechanism provided between the side pressing frame and the lower pressing frame. By expanding / contracting the gap by the circumferential expansion / contraction mechanism provided between the lower pressing frame and the side pressing frame, it is possible to hold a plurality of pressing frames along the circular shape of the segment. Can be done properly.

Further, the lower peripheral direction expansion / contraction mechanism includes an actuator that expands / contracts the gap between the side pressing frame and the lower pressing frame, and the side pressing frame and the lower pressing when the actuator expands / contracts. It may be provided with a guide that allows movement in the circumferential direction relative to the frame and restricts movement in the radial direction.

With this configuration, when the gap is expanded or contracted by the actuator provided between the side pressing frame and the lower pressing frame, the side pressing frame and the lower pressing frame are separated by the guide. Although relative movement in the circumferential direction is allowed, movement inward in the radial direction is restricted, so that the circular shape between the side pressing frame and the lower pressing frame is maintained when the actuator expands and contracts. It can be scaled stably.

Further, at least, the upper pressing frame body is provided with a lining material having a large friction coefficient on the contact surface with the segment, and the side pressing frame body has a lining material having a small friction coefficient on the contact surface with the segment. It may be provided.

With this configuration, the upper pressing frame pressed against the upper segment can be held in position with a lining material having a large friction coefficient, and the side pressing adjacent to the upper pressing frame is pressed against the segment. The frame body can reduce the frictional force when it comes into contact with the segment. As a result, the operation of the side pressing frame body sliding on the segment can be stabilized.

On the other hand, the shield excavator according to the present invention includes a shape-retaining device for any of the above segments. According to this configuration, a sufficient space can be secured at least above the rear work deck, and the degree of freedom in design for arranging necessary equipment such as a screw conveyor and hydraulic equipment can be increased.

According to the present invention, since a part of the configuration for expanding / contracting the plurality of pressing frames for holding the segments in a circular shape is arranged between the pressing frames, at least the rear working deck of the main body of the shield excavator is used. It is possible to secure a sufficient space above the above.

FIG. 1 is a vertical cross-sectional view of a shield boring machine provided with a shape-retaining device according to the first embodiment of the present invention in a side view. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. FIG. 3 is a drawing of arrow III as shown in FIG. FIG. 4A is a cross-sectional view showing a part of the shape-retaining device shown in FIG. 2 when expanded, and FIG. 4B is a cross-sectional view taken along the line IV-IV shown in FIG. FIG. 5 is a drawing showing different examples of the circumferential expansion / contraction mechanism shown in FIG. FIG. 6 is a cross-sectional view of a shield excavator provided with the shape-retaining device according to the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The concept of the vertical and horizontal directions in this specification and the documents of the claims shall be consistent with the concept of the vertical and horizontal directions in the cross section of the shield excavator 1 shown in FIG.

(First Embodiment)
FIG. 1 is a vertical sectional view of the shield excavator 1 provided with the shape-retaining device according to the first embodiment in a side view, and FIG. 2 is a sectional view taken along the line II-II shown in FIG. Further, FIG. 3 is a drawing of arrow III as shown in FIG. In FIG. 1, for the sake of explanation, the main body 2 of the shield excavator 1 shows the rear portion in a cross section of a central portion, and the shape holding device 10 shows a cross section of the upper pressing expansion / contraction mechanism 20 in a side view.

As shown in FIG. 1, the shield excavator 1 is provided at the tubular main body 2 and the front end of the main body 2, and is a circular cutter head 3 for excavating the ground M while rotating along the axis L. A plurality of shield jacks 5 for propelling the main body 2, an elector device 6 provided behind the main body 2 for assembling the segment S into a circular shape along the inner surface of the tunnel T, and rear work provided behind the main body 2. It is attached to the deck (rear structure) 7, the rear work deck 7, and includes a shape holding device 10 for holding the shape of the segment S. The earth and sand excavated by the cutter head 3 is discharged to the rear of the main body 2 from the chamber 4 provided in the front portion of the main body 2. Since the details of the operation of the shield excavator 1 are the same as those of the prior art, the description thereof will be omitted.

Subsequently, the shape holding device 10 of the present embodiment will be described in detail. As shown in FIG. 2, the shape-retaining device 10 includes four pressing frames 11 to 14 arranged in the circumferential direction so as to press the segments S assembled in a circular shape from the inside, and a pressing frame. It is provided with two vertical telescopic rods 20 (expansion / contraction mechanism for upper pressing of the present invention) for supporting 11 to 14 on the rear work deck 7. In the present embodiment, the four pressing frames 11 to 14 are in contact with or separated from the upper segment S, and the upper pressing frame 11 and the side segments adjacent to the left and right sides of the upper pressing frame 11. It is composed of side pressing frames 12 and 13 that are brought into contact with or separated from S, and a lower pressing frame 14 that is adjacent to and separated from the lower segment S adjacent to the side pressing frames 12 and 13. .. The outer surfaces of the upper pressing frame 11, the side pressing frames 12, 13 and the lower pressing frame 14 are formed in an arc shape along the curvature of the inner surface of the assembled segment S.

The telescopic rod 20 of the present embodiment is mounted on the upper part of the rear work deck 7. Each telescopic rod 20 includes a tubular frame 22 and a radial actuator 21 housed in the frame 22. The radial actuator 21 of the present embodiment is a double-rod type hydraulic jack, and the rod at the upper end thereof is pin-coupled to the upper pressing frame body 11 and the rod at the lower end thereof is attached to the lower end side of the frame 22. .. The lower end of the frame 22 is connected to the rear work deck 7 via the axial movement mechanism 40. By extending the radial actuator 21, the upper segment S can be pressed by the upper pressing frame 11 and the upper segment S can be held in a predetermined shape. The reaction force generated at this time is supported by the rear work deck 7 via the axial movement mechanism 40.

The axial movement mechanism 40 of the present embodiment includes a rail 41 arranged in the axial direction of the rear work deck 7, and a roller portion 42 attached to the lower end of the frame 22 and including a roller that engages with the rail 41. With such a configuration, the shape holding device 10 can be kept stationary with respect to the tunnel T and the segment S can be continuously held while excavating by the main body 2.

The shape holding device 10 is provided between the upper pressing frame 11 and the side pressing frames 12 and 13, and between the side pressing frames 12 and 13 and the lower pressing frame 14. A circumferential expansion / contraction mechanism 30 (30A, 30B) for expanding / contracting the gaps G1 and G2 is provided, respectively. In the present embodiment, the upper circumferential expansion / contraction mechanism 30A is provided between the upper pressing frame 11 and the side pressing frames 12 and 13, respectively, and the side pressing frames 12 and 13 and the lower pressing frame are provided. Lower circumferential expansion / contraction mechanisms 30B are provided between the body 14 and the body 14. The gaps G1 and G2 may have the same dimensions or different dimensions.

The upper circumferential expansion / contraction mechanism 30A includes a circumferential actuator 31 (hydraulic jack in this embodiment) for expanding / contracting the gap G1 between the upper pressing frame 11 and the side pressing frames 12 and 13, and the circumferential actuator 31. The first guide piece 32, which is a guide that allows the relative movement of the upper pressing frame 11 and the side pressing frames 12 and 13 in the circumferential direction and restricts the inward movement in the radial direction during expansion and contraction. It has a second guide piece 33 that cooperates with the first guide piece 32.

Further, the lower circumferential expansion / contraction mechanism 30B includes a circumferential actuator 36 that expands / contracts the gap G2 between the side pressing frames 12 and 13 and the lower pressing frame 14, and the side pressing when the circumferential actuator 36 expands / contracts. The first guide piece 37, which is a guide that allows relative movement of the frame bodies 12 and 13 and the lower pressing frame body 14 in the circumferential direction and restricts the movement inward in the radial direction, and the first guide piece 37. It has a second guide piece 38 that cooperates with.

Hereinafter, the detailed structure of the circumferential expansion / contraction mechanism 30 will be described by taking the upper circumferential expansion / contraction mechanism 30A as an example. As shown in FIG. 3, in the upper circumferential expansion / contraction mechanism 30A of the present embodiment, the circumferential actuator 31 is arranged between the end faces of the upper pressing frame 11 and the side pressing frame 12 (13). There is. The circumferential actuator 31 of the present embodiment is a double-rod type hydraulic cylinder, and the rod at one end thereof is pin-coupled to the upper pressing frame body 11 and the rod at the other end is pinned to the side pressing frame body 12 (13). ) Is pin-coupled. The circumferential actuator 31 of the present embodiment is arranged at the same radial position as the pressing frame bodies 11 to 13, but may be arranged inside the pressing frame bodies 11 to 13.

The first guide piece 32 is provided so as to extend from the inner surface of the upper pressing frame 11 toward the inner surface of the side pressing frame 12 (13). Further, the second guide piece 33 is provided from the side pressing frame body 12 (13) toward the inner surface of the first guide piece 32. The first guide piece 32 is a plate-shaped member, and is fixed (for example, welded (black-painted portion)) to the upper pressing frame 11 in the present embodiment. In the present embodiment, the proximal end side of the first guide piece 32 is curved so as to be concentric with the outer surface of the upper pressing frame 11, and is curved so as to gradually approach the center of the shape holding device as it approaches the distal end side. There is.

The second guide piece 33 is a plate-shaped member extending from the side pressing frame body 12 (13) toward the upper pressing frame body 11, and in this embodiment, the outer surface thereof has an accommodating groove over substantially the entire length. 34 is formed. The second guide piece 33 is arranged inside the first guide piece 32, and the first guide piece 32 is accommodated in the accommodating groove 34 of the second guide piece 33. The bottom surface of the accommodating groove 34 is curved concentrically with the outer surface of the side pressing frame body 12 (13). The second guide piece 33 is fixed (for example, welded (black-painted portion)) to the side pressing frame body 12 (13).
The first guide piece 32 is fixed to the side pressing frame body 12 (13), the second guide piece 33 is fixed to the upper pressing frame body 11, and the inner surface of the upper pressing frame body 11 is the first guide. It may be configured to be in contact with the outer surface of the piece 32.

As shown in FIG. 2, when the shape holding device 10 has a reduced diameter, the inner surface of the first guide piece 32 is located radially outside the outer surface of the second guide piece 33 (bottom surface of the accommodating groove 34). .. That is, the first guide piece 32 and the second guide piece 33 are separated from each other. Since the inner surface of the side pressing frame 12 (13) is in contact with the outer surface of the first guide piece 32, the relative circumference of the upper pressing frame 11 and the side pressing frame 12 (13) is relative to each other. Directional movement is allowed, but radial inward movement is restricted.

In FIG. 3, the upper circumferential expansion / contraction mechanism 30A provided between the upper pressing frame 11 and the side pressing frame 12 (13) has been described, but the side pressing frames 12 and 13 and the lower portion have been described. The lower circumferential expansion / contraction mechanism 30B provided between the pressing frame body 14 is also configured in the same manner, and the relative circumferential direction between the side pressing frame body 12 (13) and the lower pressing frame body 14 Movement is allowed, but radial inward movement is restricted. The circumferential actuators 31 and 36 may be single rod type hydraulic cylinders. Further, in addition to a jack having a cylinder and a piston, a screw jack or the like can be used. Further, the arrangement configuration of the circumferential expansion / contraction mechanism 30 is an example, and other than these arrangement configurations may be used. For example, two circumferential actuators 31 and 36 can be arranged side by side at one location and can be expanded and contracted at the same time.

Next, the operation when the shape holding device 10 holds the shape of the segment S will be described. First, the radial actuator 21 of the telescopic rod 20 is extended to press the upper pressing frame 11 against the upper segment S. Since the movements of the side pressing frame bodies 12 and 13 and the lower pressing frame body 14 are restricted by the guide pieces 32, 33, 37, 38, the circumferential actuator 31, By extending 36, the side pressing frames 12 and 13 and the lower pressing frame 14 expand toward the segment S. The operation of the pressing frames 11 to 14 during this period is regulated by the guide pieces 32, 33, 37, 38. That is, each of the pressing frames 11 to 14 expands in a state where the inner surface of the side pressing frames 12 (13) is in contact with the outer surface of the first guide piece 32 as the circumferential actuators 31 and 36 extend. Therefore, the relative movement of the upper pressing frame 11 and the side pressing frame 12 (13) in the circumferential direction is allowed, but the inward movement in the radial direction is restricted. Similarly, since the inner surface of the side pressing frame 12 (13) expands in a state of being in contact with the outer surface of the first guide piece 37, the lower pressing frame 14 and the side pressing frame 12 ( Circumferential movement relative to 13) is allowed, but radial inward movement is restricted. In the present embodiment, since the first guide piece 32 is fixed to the upper pressing frame body 11 and the first guide piece 37 is fixed to the lower pressing frame body 14, the side portions are formed by the first guide pieces 32 and 37. The inward movement of the pressing frames 12 and 13 in the radial direction is restricted.

Further, as the circumferential actuators 31 and 36 extend, the gap G1 between the upper pressing frame 11 and the side pressing frame 12 (13), and the side pressing frame 12 (13) (not shown) ) And the lower pressing frame body 14 to widen the gap G2, the first guide pieces 32 and 37 are separated from the side pressing frame body 12 (13). After that, as shown in FIGS. 4A and 4B, the tips of the first guide pieces 32 and 37 enter the accommodating grooves 34 and 39 so as to make line contact with the outer surfaces of the second guide pieces 33 and 38, respectively. Then, the relative movement of the pressing frame bodies 11 to 14 is restricted by the second guide pieces 33 and 38. Since the second guide pieces 33 and 38 each have an arc shape concentric with the side pressing frame body 12 (13), the pressing frame body 11 is finally formed due to the movement restriction of the second guide pieces 33 and 38. ~ 14 will expand concentrically while facing the segment S. When the upper pressing frame 11 is in close contact with the segment S, the pressing frames 11 to 14 are arranged so that the outer peripheral shape partitioned by them is a circular shape substantially concentric with the segment S. Become. In this way, the guide pieces 32, 33, 37, and 38 can stabilize the expansion operation of the pressing frame bodies 11 to 14.

After that, by further extending the circumferential actuator 31 of the upper circumferential expansion / contraction mechanism 30A provided between the upper pressing frame 11 and the side pressing frames 12 and 13, these gaps G1 are widened. Try to. At the same time, the circumferential actuator 36 of the lower circumferential expansion / contraction mechanism 30B provided between the side pressing frames 12 and 13 and the lower pressing frame 14 is also further extended to close the gap G2. Try to spread. As a result, the outer peripheral dimensions of the pressing frames 11 to 14 are expanded and brought into close contact with the segment S. Then, the segments S in the vertical and horizontal directions are generated by the expansion force SP that tries to concentrically expand the diameters of the pressing frames 11 to 14 (more specifically, the arcs formed by these outer surfaces) generated by the circumferential actuators 31 and 36. Can be pressed from the inside to stably hold its circular shape.

In the state where the expanding force SP is applied, it is not always necessary to press the upper pressing frame 11 with the radial actuator 21.

Since the shape holding device 10 of the present embodiment does not have a configuration (a configuration in which the shape is held via an actuator that expands and contracts in the left-right direction) as in the prior art document (Patent Document 1), the two telescopic rods 20 The reaction force in the left-right direction does not act on. Therefore, a reinforcing member for connecting the two telescopic rods 20 is not required. Therefore, a sufficient space can be secured in the upper portion of the rear work deck 7.

By the way, the upper pressing frame 11 of the present embodiment is provided with a lining material 16 having a large friction coefficient on the outer surface which is a contact surface with the segment S. Further, the side pressing frames 12 and 13 and the lower pressing frame 14 are provided with a lining material 17 having a small friction coefficient on the outer surface in contact with the segment S. As the lining material 16 having a large friction coefficient, a urethane material or the like can be used. As the lining material 17 having a small friction coefficient, a polytetrafluoroethylene material or the like can be used.

In this way, the upper pressing frame 11 pressed by the upper segment S can be held in position by the lining material 16 having a large friction coefficient. Then, the side pressing frames 12 and 13 that are pressed by the segment S adjacent to the upper pressing frame 11 and the segment S that is pressed adjacent to the side pressing frames 12 and 13 are pressed. The lower pressing frame 14 can reduce the frictional force when it comes into contact with the segment S with the lining material 17 having a small friction coefficient. Therefore, it is possible to stabilize the operation in which the side pressing frames 12 and 13 and the lower pressing frame 14 are in contact with the segment S and slide.

Further, as shown in FIG. 5, the circumferential expansion / contraction mechanism 30A (30B) is located between the upper pressing frame 11 and the side pressing frames 12 and 13 (with the side pressing frames 12 and 13). A telescopic guide 90 that expands and contracts in the chord length direction may be provided in the lower pressing frame 14 as well). In this case, the circumferential actuator 31 (36) is placed inside between the upper pressing frame 11 and the side pressing frames 12 and 13 (side pressing frames 12 and 13 and the lower pressing frame 14). It may be placed inside). In the case of this example, when the circumferential actuator 31 (36) expands and contracts, the expansion / contraction guide 90 allows the relative circumferential movement of the upper pressing frame 11 and the side pressing frames 12 and 13 in the circumferential direction. Inward movement in the direction is restricted, and similarly, relative movement in the circumferential direction between the lower pressing frame 14 and the side pressing frames 12 and 13 is allowed, and inward movement in the radial direction is restricted. .. Moreover, the expansion / contraction guide 90 alone can guide the pressing frame bodies 11 to 14 when the diameter is expanded or reduced. The arrangement of the guide and the circumferential actuator is not limited to these arrangements.

(Second Embodiment)
Next, the shape holding device 50 of the second embodiment will be described. Since the configuration of the shield boring machine 1 is the same as that of the shield boring machine 1 of the first embodiment described above, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

FIG. 6 shows a cross-sectional view (same cross section as in FIG. 2) of the shape-retaining device 50 of the present embodiment. The plurality of pressing frames 51 to 53 in the shape holding device 50 of the present embodiment are the upper pressing frame 51 that is brought into contact with or separated from the upper segment S, and the side portions adjacent to the upper pressing frame 51. It is composed of side pressing frames 52 and 53 that are brought into contact with or separated from the segment S of the above. The outer surfaces of the upper pressing frame 51 and the side pressing frames 52 and 53 are formed in an arc shape along the curvature of the inner surface of the assembled segment S.

In the present embodiment, instead of the lower pressing frame 14, the lower segment S is held by the two left and right holding members 67. The two telescopic rods 60 of the present embodiment (the expansion / contraction mechanism for pressing the upper part of the present invention) are provided on the left and right outer sides of the rear work deck 7, and are supported on the upper part of the rear work deck 7 via the axial movement mechanism 80. Has been done. The axial movement mechanism 80 has a rail 81 provided at the upper part of the rear work deck, and a roller portion 82 including a roller extending from the lower frame 61 to the rear work deck 7 side and engaging with the rail 81.

The upper end of the telescopic rod 60 is connected to the upper pressing frame 51, and the lower end thereof is connected to the holding member 67. The telescopic rod 60 includes a tubular lower frame 61, a tubular upper frame 63, and a radial actuator 62 housed in the lower frame 61 and connecting the lower frame and the upper frame. The radial actuator 62 of the present embodiment is a hydraulic cylinder, the lower end side is supported by the lower frame 61, and the upper end side rod is supported by the upper frame 63. The upper frame 63 is pin-coupled to the upper pressing frame 51. The lower portions of the side pressing frames 52 and 53 are connected to the telescopic rod 60 via a hinge 65. In the first embodiment, the lower portions of the side pressing frames 12 and 13 are swingably connected to the circumferential actuator 36 (configuration of the shape holding device 10) arranged between the side pressing frames 12 and the lower pressing frame 14. However, in the present embodiment, the lower portions of the side pressing frames 52 and 53 are swingably connected to the telescopic rod 60 via the hinge 65.

A circumferential expansion / contraction mechanism 70 is provided between the upper pressing frame 51 and the side pressing frames 52 and 53. The circumferential expansion / contraction mechanism 70 of the present embodiment includes a circumferential actuator 71 that expands / contracts the gap G1 between the upper pressing frame 51 and the side pressing frames 52 and 53.

Further, the shape holding device 50 includes an expansion / contraction actuator 66 for assisting the expansion / contraction of the side pressing frames 52 and 53. The expansion / contraction actuator 66 is mainly used for assisting when the side pressing frames 52 and 53 are inwardly reduced in diameter. The expansion / contraction actuator of the present embodiment is a double-rod type hydraulic cylinder, and the rod at one end is pin-coupled at a position away from the hinge 65 portion of the side pressing frame 52 (53), and the rod at the other end is connected. Is pin-coupled to the lower frame 61. The left and right telescopic rods 60 (lower frame 61) are connected by a reinforcing member 64 extending in the left-right direction at a height position corresponding to the expansion / contraction actuator 66. By connecting with the reinforcing member 64, the moment acting on the telescopic rod 60 via the expansion / contraction actuator 66 is suppressed.

Next, the operation of the shape holding device 50 of the present embodiment will be described. The radial actuator 62 of the telescopic rod 60 is extended so that the upper pressing frame 51 is brought into close contact with the upper segment S and the holding member 67 is brought into close contact with the lower segment S. In the present embodiment, a lining material 16 having a large friction coefficient is provided on the outer surface of the holding member 67, and the lower frame 61 is held in a fixed position. By extending the circumferential actuators 71 and 71 with the movement of the upper pressing frame 11, the side pressing frames 52 and 53 expand toward the segment S. When the upper pressing frame 51 is in close contact with the segment S, the pressing frames 51 to 53 are arranged so that the outer peripheral shape composed of them is substantially concentric with the segment S. Become.

Then, by further extending the circumferential actuator 71 of the circumferential expansion / contraction mechanism 70 provided between the upper pressing frame 51 and the side pressing frames 52 and 53, the side pressing is centered on the hinge 65. The frame bodies 52 and 53 rotate, and the gap G1 tries to widen. At the same time as this operation, the expansion / contraction actuator 66 may be extended to urge the side pressing frames 52 and 53 outward. As a result, the pressing frame bodies 51 to 53 are brought into close contact with the segment S, and an expanding force SP that tries to expand the diameter of the pressing frame bodies 51 to 53 (more specifically, the arc formed by the outer surface thereof) acts on the segment. The S can be pressed from the inside to maintain its circular shape.

Further, since the expansion / contraction actuator 66 is provided only below the rear work deck 7, it is not necessary to provide the reinforcing member 64 for connecting the telescopic rods 60 so as to cross the upper part of the rear work deck 7. Therefore, a sufficient space can be secured above the rear work deck 7, and necessary equipment such as a screw conveyor and hydraulic equipment can be easily arranged above the rear work deck 7.

(Modification example)
The number of divisions of the pressing frame bodies 11 to 14 and 51 to 53 shown in the embodiment is an example, and the number of divisions should be determined according to the size of the outer diameter of the shield excavator 1 and the size of the earth pressure MP. The number of divisions of the pressing frame bodies 11 to 14 and 51 to 53 in the above embodiment is an example and is not limited to the above embodiment.

Further, although the guide pieces 32 and 33 and the guide pieces 37 and 38 shown in the embodiment are arranged side by side in the circumferential expansion / contraction mechanisms 30A and 30B, they may be one.

Further, the second guide pieces 33 and 38 shown in the embodiment are formed of the same plate-shaped members as the first guide pieces 32 and 37, and the tips of the first guide pieces 32 and 37 are brought into contact with the outer surface thereof. You may.

Further, the embodiment shows an example, and the configurations in the above-described embodiments can be combined, and various configurations may be changed as long as the gist of the present invention is not impaired. It is not limited to the embodiment.

1 Shield boring machine
2 Main body
5 Shield jack
6 Electa device
7 Rear work deck 10 Shape holding device 11 Upper pressing frame 12 Side pressing frame 13 Side pressing frame 14 Lower pressing frame 16 Lining material 17 Lining material 20 Telescopic rod (Upper / contraction mechanism for upper pressing)
21 Radial actuator 29 Upper compression / contraction mechanism 30 Circumferential expansion / contraction mechanism 30A Upper circumferential expansion / contraction mechanism 30B Lower circumferential expansion / contraction mechanism 31 Circumferential actuator 32,33 Guide piece (guide)
36 Circumferential actuator 37,38 Guide piece (guide)
40 Axial movement mechanism 50 Shape holding device 51 Upper pressing frame 52 Side pressing frame 53 Side pressing frame 60 Telescopic rod (upper / contraction mechanism for upper pressing)
61 Lower frame 62 Radial actuator 64 Reinforcing member 65 Hinge 66 Expansion / contraction actuator 67 Holding member 69 Upper expansion / contraction mechanism 70 Circumferential expansion / contraction mechanism 71 Circumferential actuator 80 Axial movement mechanism G1, G2 Gap

Claims (5)

A shape-retaining device that holds the circular shape of the segments assembled by the Electa device at the rear of the main body of the shield boring machine.
A plurality of pressing frames arranged in the circumferential direction so as to press the assembled segment from the inside are provided.
The plurality of pressing frames are at least a side that is brought into contact with or separated from the upper segment and a side that is adjacent to the upper pressing frame and is brought into contact with or separated from the segment on the side. Has a frame for pressing the part,
The lower part of the side pressing frame is swingably supported by the configuration of the shape holding device.
An expansion / contraction mechanism for upper pressing that supports the reaction force against the rear structure of the main body and advances and retreats the upper pressing frame toward the upper segment.
A plurality of the pressing frames are arranged between the upper pressing frame and the side pressing frame, and the gap between the upper pressing frame and the side pressing frame is expanded or contracted. e Bei the circumferential direction decreasing mechanism for scaling the outer peripheral dimension, and
The circumferential expansion / contraction mechanism includes at least an actuator that expands / contracts the gap between the upper pressing frame and the side pressing frame, and the upper pressing frame and the side pressing frame when the actuator expands / contracts. It has a guide, which allows movement in the circumferential direction relative to the body and limits movement inward in the radial direction.
The actuator is arranged between the end faces of the upper pressing frame and the side pressing frame.
The guide is provided so as to extend to the inner surface of the upper pressing frame and the inner surface of the side pressing frame.
A segment shape-retaining device. The plurality of pressing frames further include a lower pressing frame that is brought into contact with or separated from the lower segment.
Lower circumferential expansion / contraction mechanism that expands / contracts the gap between the side pressing frame and the lower pressing frame to expand / contract the outer peripheral dimensions of the plurality of pressing frames. Is equipped with
The segment shape holding device according to claim 1. The lower peripheral direction expansion / contraction mechanism includes an actuator that expands and contracts the gap between the side pressing frame and the lower pressing frame, and the side pressing frame and the lower pressing frame when the actuator expands and contracts. It is equipped with a guide, which allows relative movement in the circumferential direction and limits movement in the radial direction.
The segment shape holding device according to claim 2. At least a lining material for comprising the contact surface between the said segments of the upper pressing frame, the lining material to be provided in the contact surface between the segments of the side pressing frame body,
The friction coefficient of the lining material of the side pressing frame is smaller than the friction coefficient of the lining material of the upper pressing frame.
The segment shape holding device according to any one of claims 1 to 3. The segment shape-retaining device according to any one of claims 1 to 4 is provided.
A shield boring machine that features that.

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