JPH086867Y2 - Shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a shield machine used for excavating tunnels for railways, water and sewerage, etc. by a shield construction method, and particularly a curve with a small curve radius. The present invention relates to a shield machine applied to construction.

[Conventional technology]

Conventionally, for example, as disclosed in Japanese Patent Publication No. 61-23353, by excavating in a state in which a cylindrical front body that rotatably supports a cutting excavator is bent with respect to the rear body, It is known that the shield machine has a small amount of excess digging for bending.

Further, as disclosed in Japanese Patent Application Laid-Open No. 58-213995, the rotatable shaft of a rotatable cutter is eccentric in the radial direction with respect to the front body, and the tip of the front body is provided with a diameter of the cutter. It is formed in a frusto-conical shape so that the diameter of the shield machine is smaller than that of the cut surface, and the outer edge of the cutter is made to follow the outer trajectory of the curved tunnel during the curve excavation. It is known to omit the above and reduce the amount of over dug in the inner part.

[Problems to be Solved by the Invention] Among the above-mentioned conventional techniques, in the case of the former center-folding shield machine, the allowable distance between the front body and the rear body and the propulsion and Due to the structure of the shield machine such as restrictions on the mounting position of the jack for center folding, the maximum angle of center folding is limited to about 10 degrees. Therefore, the curve radius is
If it is less than about 10 m, the amount of excess excavation required for bending becomes large, making it difficult to construct a curved line.

In addition, when the curve radius is 10 m or less, the tail seal provided at the rear end of the rear body and the segment will interfere with each other.In order to eliminate such interference, the outer diameter of the segment is different from that of the rear body. If it is made smaller, the clearance between the segment and the inner peripheral surface of the tunnel becomes larger, and the amount of backfill material required to fill the tail void increases. for that reason,
It is difficult to actually perform curved construction with a radius of 10 m or less.

Furthermore, when the amount of excess digging increases, the amount of sediment that cannot be taken into the body of the excess excavation increases, and the remaining sediment becomes resistance to the bending of the shield machine.

Further, among the above-mentioned conventional techniques, in the case of the latter eccentric eccentric type shield excavator, it is possible to reduce the amount of excess digging, but before the sand excavated at the knuckle portion protruding from the front body to the side Intake into the body becomes insufficient, and excess dug and sand are pressed and solidified as the front body progresses, and the resistance for the bending of the shield machine increases.

The present invention has been made in view of the above circumstances, and a shield machine capable of efficiently performing curved construction with a small curve radius without causing interference between the tail seal and the segment and with a small amount of excess digging. Is intended to provide.

[Means for solving the problem]

In order to achieve the above object, a shield machine according to the present invention is configured such that a tip end portion of a tubular front body that rotatably supports an excavating cutter is bent in one radial direction as a whole, and the cutter is used. The eccentric rotation axis is eccentric in the bending direction of the bending tip portion of the front body.

[Action]

According to this invention, since the front end of the front body is bent in one direction in the radial direction as a whole, the front end of the front body should be positioned at the inner side of the curved tunnel when the curve is dug. As a result, it is possible to perform curve construction with a small curve radius in a state where the amount of overcutting is small, even if the angle of refraction of the front body with respect to the rear body is not too large. Also, at this time,
Since the cutter is eccentrically provided on the bent tip side of the front case, most of the earth and sand excavated by the cutter can be smoothly taken into the bent tip of the front case.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a shield machine according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. In FIG. Is equipped with a copy cutter 1B for excavating the overexcavation portion A by eccentric rotary motion,
It receives the propulsive force of the shield jack 2 and digs forward F.

Reference numeral 3 denotes a tubular front body, which is rotatably supported by a bearing portion 9 via a rotary sliding seal 4 between an annular member 3a fixed inside the front end portion of the front body 3 and a bulk head 7. The cutter disk 1 is fixed to the annular member 8, and the cutter disk 1 is rotatably supported by the front body 3. Reference numeral 5 denotes a cutter disk drive motor, which drives and rotates the cutter disk 1 via a pinion gear 6 fixed to the motor shaft and an internal gear 9'attached to a bearing portion 9 fixed to the rear end of the annular member 8. Let

Reference numeral 10 denotes a tubular rear body, which is disposed behind the front body 3 and supports the front body 3 swingably via an annular spherical member 11 provided so as to project forward from the front end thereof. are doing.
Reference numeral 12 is a hinge, which is provided in a pair up and down, and includes a front body 3 and a rear body.
Center bending pin 1 on the connecting members 13 and 14 protruding from 10
5 is inserted so that the front body 3 can be folded horizontally in the middle.

Reference numeral 16 denotes a center-folded jack, which is provided so as to project between the front body 3 and the rear body 10. The expansion and contraction of the center-folded jack 16 causes the front body 3 to be centered as shown in FIG. Broken pin 15
Around the center 0, the rear torso 10 is bent horizontally. In FIG. 3, the middle folding jacks 16 are provided in the circumferential direction, and four shield jacks 2 are provided.

Reference numeral 17 denotes a tail seal, and the mounting portion of the tail seal is bent and attached to the rear end portion of the rear body 10. As a result, the tail seal and the segment do not interfere with each other even if the outer diameter of the segment is not reduced, which facilitates the curved construction.

In the shield machine having the above-described configuration, the tip portion 3A of the front body 3 is bent in one radial direction, that is, in the horizontal direction as shown in FIG. 1, and the rotation of the cutter disk 1 is performed. The axis S is the central axis S1 of the center pin 15
On the other hand, the bending tip portion 3A of the front body 3 is decentered in the bending direction by an amount ΔS that is substantially equal to the maximum bending amount Δx of the bending tip portion 3A.

 Next, the operation of the above configuration will be described.

When excavating a curved line, by changing the amount of expansion and contraction of the left and right center folding jacks 16 in FIG. 3, the front body 3 rotates around the center folding pin 15 with respect to the rear body 10, and as shown in FIG. ,
It is refracted in one of the horizontal directions. At this time, since the bending direction of the front body 3 is the direction in which the tip bent portion 3A of the front body 3 is located on the inner side of the curved tunnel, even if the refraction angle θ is not set too large, The required excess excavation allowance H on the inner side in the curving direction can be reduced.

In the above refraction state, the forward ground is excavated by the rotation of the cutter disk 1, and the excavation area A is excavated by the copy cutter 1B, while the propulsive force of the shield jack 2 advances the cutter disk 1 and the front body 3. Then, when the rear body 10 is moved forward by contraction of the shield jack 2, the shield excavator is sequentially advanced in a lengthy insect type, thereby performing a predetermined curve excavation. At this time, since the cutter disk 1 is eccentric to the bent tip 3A side of the front body 3, most of the earth and sand excavated by the cutter disk 1 on the side of the overditch A is the bent tip 3A.
After that, it is smoothly taken into the front body 3. As a result, the amount of excess excavation is originally small and the excavated soil by the cutlet disk 1 hardly remains in the excess excavation portion A, thereby reducing the resistance of the shield machine to bend,
A predetermined curve excavation can be efficiently performed.

In this embodiment, the propulsive force of the shield jack 2 added to the front case 3 is applied to the rear case 10 from the connecting member 13 of the front case 3 through the center bending pin 15 and the connecting member 14 of the rear case 10. Since it is transmitted, the large bending force is not applied to the broken Jacuzzi 16. Therefore, a small number of the use of the middle folding jack 16 can be used.

4 to 6 are cross-sectional views of the essential parts showing the structure of the hinge 7 in another embodiment of the present invention. In this embodiment, the connecting member 13 of the front case 3 has an L-shaped cross section, and a convex spherical surface portion 13a is formed on the outer periphery thereof.
A first long hole 18 that is long in the front-rear direction is formed. on the other hand,
The connecting member 14 of the rear torso 10 has a U-shaped cross section, and has a recess 14b into which the connecting member 13 of the front torso 3 is inserted and a concave spherical surface portion 14a with which the spherical surface portion 13a is in spherical contact. 13a, 14a
The center of the curvature is set to the center point Q of the shield machine.

The connecting member 14 of the rear body 10 is provided with a second elongated hole 19 corresponding to the first elongated hole 18 and elongated in the front-rear direction.
Further, a pair of upper and lower center-folding pins 15 that are provided 180 ° apart from each other in the circumferential direction are fitted to the connecting member 14 and the spherical member 11 of the rear body 10, and both the long holes 18 and 19 are provided. Penetrates.

In FIG. 4, both of the long holes 18 and 19 are formed such that the front end face and the rear end face thereof both have a tapered shape which becomes narrower toward the outer diameter direction of the rear body 10, and the front and rear ends of the center bending pin 15 A gap is set on the rear side, and the first elongated hole
As shown in FIG. 4, in the gap of 18, the first fitting stoppers 20A, 20A for straight advance having a symmetrical shape in the front-rear direction and an asymmetrical shape in the front-rear direction as shown in FIG. 5 and FIG. The two types of first fitting stoppers 20B, 20C for bending are selectively fitted without any gap, while the gap of the second elongated hole 19 has a gap shown in FIGS. The second fitting stoppers 21, 21 common to both FIGS. 6 and 6 are configured to be fitted without a gap.

According to the embodiment of the configuration shown in FIGS. 4 to 6, the first fitting stopper 20A for straight traveling is provided in the first elongated hole 18, and the second fitting stopper is provided in the second elongated hole 19. In the state shown in FIG. 4 in which the respective 21 are fitted, the straight bending is performed by setting the amount of expansion and contraction of the middle folding jack 16 to be the same. Further, in the same state as shown in FIG. 4, by changing the amount of expansion and contraction of the center folding jack 16 to the left and right, the front body 3 and the rear body 10 are pinned to the center folding pin.
As in the case of FIG. 1, the shield excavator is turned around 15 so that the entire shield excavator is bent in one direction in the horizontal direction, and the curve excavation along the horizontal plane is performed.

In addition, as shown in FIG.
The fitting stoppers 20B and 20C of FIG. 2 and the second fitting stopper 21 are fitted into the second elongated holes 19, respectively, and the lower middle folding jack 16 is extended and the upper middle folding jack 16 is extended.
By contracting, the front body 3 is bent upward with respect to the rear body 10 by an angle θ1. In this state, the rolling of the shield machine can be corrected by changing the direction in which the rear trunk is folded inward.

Further, as shown in FIG. 6, by changing the upper and lower positions of the first fitting stoppers 20B, 20C for bending, the front body 3
Is refracted downward with respect to the rear body 10 by an angle θ2.

Furthermore, as shown in FIGS. 5 and 6, with the front body 3 bent upward or downward, the front trunk 3 is also bent in the horizontal direction shown in FIG. 4 to curve the shield machine in a three-dimensional direction. It is also possible to dig.

FIG. 7 is a vertical cross-sectional view of the main part showing another embodiment of the present invention. In this embodiment, the hinge 12 shown in each of the above-mentioned embodiments is omitted, and FIGS. As shown, a large number of middle folding jacks 16 are arranged alternately with the shield jack 2 in the circumferential direction, and by adjusting the expansion and contraction amount of these large numbers of middle folding jacks 16, the front torso 3 with respect to the rear torso 10. It is configured such that it can be bent horizontally and vertically.

FIG. 9 shows that the inner surface of the annular member 3a fixed to the inside of the cylindrical front body 3 of the cutter disk 1 is formed into a concave spherical surface portion 3b, and a convex spherical surface portion 8b slidably contacting the spherical surface portion 3b is formed. The cutter disk 1 is provided on the cutter disk 1 side, and the cutter disk 1 is supported on the front body 3 so as to be able to swing freely. By adopting such a configuration, it is possible to further reduce excess dug.

[Effect of device]

As described above, according to the present invention, by bending the tip of the front body in one radial direction and by eccentricizing the cutter in the bending direction, it is possible to perform curved construction with a small curve radius. At the same time, it is possible to reduce the required amount of excess excavation without having to make the refraction angle of the front body too large, and to suffice most of the earth and sand excavated by the knives in the front body.
You can take in smoothly and reduce the resistance when moving forward. Therefore, it is possible to efficiently carry out curve construction with a small curve radius without causing interference between the tail seal portion and the segment and an increase in resistance during bending.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shield machine showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 shows an arrangement of a center-folded jack and a shield jack. FIG. 4 is a schematic front view, FIG. 4 to FIG. 6 are cross-sectional views of main parts showing another embodiment of the present invention, and FIG. 7 is a vertical cross-sectional view of main parts showing another embodiment of the present invention. FIG. 8 is a schematic front view of FIG. 7, and FIG. 9 is a vertical cross-sectional view of a main part showing a modified structure of a supporting portion of a cutter disk. 1 ... Cutta disk, 2 ... Shield jerk, 3 ... Front body, 3A ... Bend tip, 10 ... Rear body, 15 ... Center pin, 16 ...
Middle-breaking jack, 17 ... tail seal, S ... rotating shaft of cut disk.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical front body for rotatably supporting an excavating cutter, a cylindrical rear body for rotatably supporting the front body, and a front body and a rear body. In a shield machine equipped with a middle bending jack that is installed and bends the front body with respect to the rear body, while bending the tip of the front body in one of the radial directions as a whole, the rotation axis of the cutter is A shield machine, wherein the bending tip of the front body is eccentric in the bending direction.