Articulated shield tunneling machine

Abstract

To provide an articulated shield tunneling machine capable of reducing frictional force acting between the tunneling machine and the ground.SOLUTION: An articulated shield tunneling machine 1, in which a front body 2 is bendable relative to a rear body 3, includes a slip material supplying device 21 that supplies slip material to an outer periphery of the front body 2, a slip material injection port 22 that penetrates a skin plate 5 of the front body 2, and a front body groove 23 formed along the tunnel axis direction on the outer periphery of the skin plate 5. The slip material injection port 22 is connected to the front body groove 23.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a center-bending shield tunneling machine. [Background technology]

[0002] As a shield tunneling machine for excavating a sharply curved tunnel, a center-bending shield tunneling machine in which the front body is bent relative to the rear body is known. In a center-bending shield tunneling machine, the front body is heavy and the center of gravity is at the front, so the front end is likely to drop. This causes a problem of increased peripheral friction between the ground and the shield tunneling machine, which generates vibration. In order to suppress this vibration, the peripheral friction with the ground is reduced by overcutting, but if the overcutting is eliminated, the peripheral friction between the ground and the shield tunneling machine increases. In the jacking method, a configuration for reducing the frictional force acting between the jacking pipe and the natural ground is known in which a spiral groove is formed on the outer periphery of the jacking pipe and a lubricant is poured into the spiral groove (see Patent Document 1). There is also a method in which a groove extending in the circumferential direction is formed on the outer periphery of the jacking pipe body and a lubricant is poured into the groove (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-2079 A [Patent Document 2] JP 2019-60079 A Summary of the Invention [Problem to be solved by the invention]

[0004] There has been no center-bending shield excavator that has a groove formed on the outer periphery of the body and has a sliding material flow through the groove. Even if the spiral groove of Patent Document 1 or the circumferential groove of Patent Document 2 were formed on the outer periphery of the body of a center-bending shield excavator, the weight of the body is large and it is difficult for the sliding material to flow backward, so the friction force acting between the ground and the shield excavator cannot be efficiently reduced, and there is a risk of vibration occurring. From this perspective, an object of the present invention is to provide a center-bending shield tunneling machine that can reduce the frictional force acting between the tunnel and the ground. [Means for solving the problem]

[0005] In order to solve such problems, the present invention provides a center-bending shield tunneling machine in which a front body is bendable relative to a rear body, the machine comprising a skid supply device for supplying skid to an outer periphery of the front body, a skid injection port penetrating a skin plate of the front body, and a front body groove formed in the outer periphery of the skin plate along the tunnel axis direction. The skid injection port is connected to the front body groove. According to the center-bending shield excavator of the present invention, the front body groove is formed along the axial direction of the excavator, so that the slippery material can easily flow rearward along the axial direction, thereby reducing the frictional force with the ground.

[0006] In the center-bending shield tunneling machine of the present invention, it is preferable that the rear end of the front body groove is close to a recess formed between the skin plate of the front body and the skin plate of the rear body. With this configuration, the slippery material flowing from the front body groove spreads in the circumferential direction in the recess, and the slippery material is supplied over a wide area. In the center-bending shield tunneling machine of the present invention, it is preferable that a plurality of the front barrel grooves are formed, and a communication groove is formed at the front end of each front barrel groove, which communicates the slipper injection port formed in each front barrel groove with the adjacent front barrel grooves. With this configuration, the slipper can be efficiently fed from a single slipper supply device and slipper injection port to a plurality of front barrel grooves. Furthermore, in the center-bending shield tunneling machine of the present invention, it is preferable that a rear trunk groove is further formed on the outer peripheral surface of the skin plate of the rear trunk along the tunnel axis direction, and the front end of the rear trunk groove is connected to the recess. With this configuration, the slipper flows along the rear trunk groove, so that the friction force between the ground and not only the front trunk but also the rear trunk can be reduced. In the center-bending shield tunneling machine of the present invention, the front and rear trunk grooves are preferably formed on an arc having a central angle of 120° including the lowest point in the cross-sectional view of the tunnel on the outer circumferential surface of the skin plate. With this configuration, it is possible to supply a slippery material to the bottom of the shield tunneling machine where the frictional force with the natural ground is large. Effect of the Invention

[0007] According to the center-bending shield tunneling machine of the present invention, the frictional force acting between the tunneling machine and the natural ground can be reduced. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view showing the lower half of a center-bending shield excavator according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a bottom view showing a center-bending shield excavator according to an embodiment of the present invention. [Diagram 3] 2A and 2B are diagrams showing a center-bending shield tunneling machine according to an embodiment of the present invention, in which (a) is a cross-sectional view taken along line IIIA-IIIA in FIG. 1, and (b) is a cross-sectional view taken along line IIIB-IIIB in FIG. [Figure 4] FIG. 4 is an enlarged view of part IV in FIG. 3(b), showing the front groove of a center-bending shield tunneling machine according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a diagram showing a center-bending shield excavator according to an embodiment of the present invention, and is a cross-sectional view taken along line VV in FIG. [Figure 6] 1A and 1B are diagrams showing a skid supply device and a skid injection port of a center-bending shield excavator according to an embodiment of the present invention, where (a) is a side view and (b) is a front view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The bending shield tunneling machine according to the embodiment of the present invention will be described with reference to the attached drawings. Fig. 1 is a side view showing the lower half of the bending shield tunneling machine according to the embodiment of the present invention, Fig. 2 is a bottom view showing the bending shield tunneling machine, Fig. 3 is a view showing the bending shield tunneling machine, (a) is a cross-sectional view taken along line IIIA-IIIA in Fig. 1, (b) is a cross-sectional view taken along line IIIB-IIIB in Fig. 1, Fig. 4 is a view showing the front body groove, and is an enlarged view of part IV in (b) in Fig. 3, Fig. 5 is a view showing the bending shield tunneling machine, and is a cross-sectional view taken along line VV in Fig. 1, Fig. 6 is a view showing the lubricant supply device and the lubricant injection port, (a) is a side view, and (b) is a front view.

[0010] As shown in Figures 1 and 2, the center-bending shield excavator 1 comprises a front body 2 and a rear body 3. The front body 2 is disposed at the front of the shield body and is connected to the rear body 3 so as to be able to be bent. The front body 2 comprises a skin plate 5 which constitutes the outer shell. A cutter head 6 for excavating the natural ground is rotatably provided at the front end of the front body 2. The soil excavated by the cutter head 6 is discharged rearward by a screw conveyor (not shown) which opens at the lower end of a partition wall 8 which defines a chamber 7. The rear fuselage 3 is disposed behind the front fuselage 2. The rear fuselage 3 is provided with a skin plate 9 that constitutes the outer shell. The diameter of the skin plate 9 of the rear fuselage 3 is the same as that of the skin plate 5 of the front fuselage 2. A convex arc-shaped curved surface portion 10 is formed on the outer peripheral surface of the front end of the rear fuselage 3. The outer peripheral surface of the convex arc-shaped curved surface portion 10 is spherical, and is in sliding contact with the inner peripheral surface of the rear end of the front fuselage 2 via a packing (not shown). The front fuselage 2 and the rear fuselage 3 are connected to each other via the convex arc-shaped curved surface portion 10 so that they can bend. A recess 11 is formed at the rear end of the convex arc-shaped curved surface portion 10. The recess 11 has a groove shape that extends along the circumferential direction of the rear fuselage 3, and becomes a space into which the rear end of the skin plate 5 fits when the front fuselage 2 is bent. A bending jack (not shown) is provided inside the connection between the front fuselage 2 and the rear fuselage 3 to bend the front fuselage 2 relative to the rear fuselage 3. The bending jack extends along the axial direction of the shield body, with its front end connected to the front body 2 and its rear end connected to the rear body 3. A plurality of bending jacks are arranged at predetermined intervals in the circumferential direction of the shield body. By appropriately extending and retracting the bending jack, the front body 2 can be bent in a desired direction.

[0011] As shown in Figs. 1 to 3, the center-bending shield tunneling machine 1 according to this embodiment includes a lubricant supplying device 21, a lubricant injection port 22, a front body groove 23, and a rear body groove 24. The lubricant supplying device 21 is a device that supplies lubricant to the front body groove 23 in order to reduce the frictional force generated between the shield body and the natural ground. For example, grease, oil, polymer lubricant, etc. are used as the lubricant. The lubricant supplying device 21 includes an extrusion means 25 that extrudes the lubricant and an extrusion nozzle 26. The extrusion means 25 includes a cylinder that contains the lubricant, a piston that is slidably provided in the cylinder, and a driving means that moves the piston back and forth in the cylinder. The lubricant is supplied by pushing out the lubricant in the cylinder with the piston. The base end of the extrusion nozzle 26 is connected to the tip end of the extrusion means 25, and the tip end is connected to the lubricant injection port 22. The extrusion nozzle 26 is inclined so that the base end is located further forward and above the tip end of the shield body, and the lubricant is sprayed from the lubricant injection port 22 toward the rear and lower side.

[0012] The lubricant injection port 22 is an opening for supplying lubricant from the lubricant supply device 21 inside the front body 2 toward the natural ground, and is formed through the skin plate 5 of the front body 2. The lubricant injection port 22 is formed on the lower side of the skin plate 5 at the front end of the front body 2. As shown in FIG. 3(a), the lubricant injection port 22 is formed at four locations spaced apart along the circumferential direction within a range on an arc with a central angle of 120° including the lowest point P in the tunnel cross-sectional view on the outer circumferential surface of the skin plate 5. The four lubricant injection ports 22 of this embodiment are arranged at a central angle of 30°. Specifically, the lubricant injection ports 22 are arranged at two locations on each side of the lowest point P (at positions of ±15° and ±45° with respect to a line connecting the center of the arc and the lowest point P), that is, at four locations at a central angle of 30°.

[0013] The front body groove 23 is for facilitating the flow of the sliding material along the skin plate 5 of the front body 2, and is formed on the outer peripheral surface of the skin plate 5 along the axial direction (excavation direction) as shown in Figs. 1 to 3. The front body groove 23 has a trapezoidal cross section. The bottom surface of the front body groove 23 is the short side of the trapezoid, and the outer opening is the long side of the trapezoid. Both side walls of the front body groove 23 are the oblique sides of the trapezoid and are inclined along the radial direction of the shield body. For example, when the skin plate 5 is a steel plate with a thickness of 32 mm, the front body groove 23 is formed with a width of 70 mm and a depth of 5 mm (see Fig. 4). With such dimensions, it is possible to minimize the decrease in strength of the skin plate 5. The cross-sectional shape of the front body groove 23 may be a simple rectangle rather than a trapezoidal shape. The front body groove 23 is formed on the outer peripheral surface of the skin plate 5 on an arc with a central angle of 120° including the lowest point P in the tunnel cross-sectional view (see Fig. 3(b)).

[0014] The front body groove 23 includes a first front body groove 23a and a second front body groove 23b. The first front body groove 23a is a groove that is directly connected to the lubricant injection port 22 and extends rearward from each lubricant injection port 22. The front end of the first front body groove 23a is connected to the lubricant injection port 22. The rear end of the first front body groove 23a extends to the rear end of the front body 2 and is close to the recess 11 formed between the skin plate 5 of the front body 2 and the skin plate 9 of the rear body 3. The first front body groove 23a, like the lubricant injection port 22, is arranged at two locations on each side of the lowest point P (at positions of ±15° and ±45° with respect to the line connecting the center of the arc and the lowest point P), that is, at four locations with a central angle of 30° (see FIG. 3(a)).

[0015] The second front groove 23b is a groove offset from the first front groove 23a in the circumferential direction of the shield body. The second front groove 23b is parallel to the first front groove 23a and is disposed between the adjacent first front grooves 23a, 23a. Specifically, as shown in FIG. 3B, the second front groove 23b in this embodiment is disposed at three locations in total, including one location including the lowest point P and two locations shifted inward by a central angle of 10° from each of the outer first front grooves 23a (the first front grooves 23a shifted by a central angle of 45° from the lowest point P) (see FIG. 3B). The front end of the second front groove 23b and the lubricant injection port 22 adjacent to this second front groove 23b are communicated with each other through a communication groove 27. The communicating groove 27 connects the front end of the first front groove 23a and the front end of the second front groove 23b, and is formed at an angle with respect to the axial direction of the shield body (see Figs. 1 and 2). The communicating groove 27 has a trapezoidal cross section similar to the front groove 23. The rear end of the second front groove 23b extends to the rear end of the front body 2 and is close to the recess 11. In this way, the rear end of the first front groove 23a and the rear end of the second front groove 23b both extend to the vicinity of the recess 11, so that the slippery material that flows inside the front groove 23 can easily flow into the recess 11.

[0016] The rear trunk groove 24 is for facilitating the flow of the lubricant along the skin plate 9 of the rear trunk 3, and is formed along the axial direction on the outer peripheral surface of the skin plate 9. The rear trunk groove 24 has a trapezoidal cross section similar to the front trunk groove 23. The rear trunk groove 24 is formed on an arc with a central angle of 120° including the lowest point P in the tunnel cross-sectional view on the outer peripheral surface of the skin plate 9 (see FIG. 5). The rear trunk groove 24 is arranged coaxially with the front trunk groove 23 behind the front trunk groove 23. The front end of the rear trunk groove 24 extends to the front end of the rear trunk 3 and is connected to the recess 11 formed between the skin plate 5 of the front trunk 2 and the skin plate 9 of the rear trunk 3. This makes it easier for the lubricant that flows from the front trunk groove 23 into the recess 11 to flow into the rear trunk groove 24. The rear end of the rear trunk groove 24 extends to the vicinity of the rear end of the rear trunk 3.

[0017] According to the bending shield tunneling machine 1 of this embodiment, the front body groove 23 is formed along the axial direction (excavation direction) of the tunneling machine, so the slipping material easily flows backward along the axial direction. That is, according to the bending shield tunneling machine 1, the slipping material easily spreads on the underside of the front body 2, so the frictional force generated between the front body 2 and the ground can be reduced, and the vibration of the front body 2 can be suppressed. In particular, the effect of reducing the frictional force that tends to be large in the front body 2, which is equipped with the cutter head 6 and serves as the front center of gravity, is great. Furthermore, in this embodiment, the rear body groove 24 is formed along the axial direction of the tunneling machine, so the slipping material easily spreads on the underside of the rear body 3. That is, according to the bending shield tunneling machine 1, the frictional force generated between the rear body 3 and the ground is also reduced by the slipping material, so the vibration of the rear body 3 can also be suppressed. This allows the bending shield tunneling machine 1 to excavate smoothly. Since the rear end of the front groove 23 is close to the recess 11 formed between the front and rear torsos 2 and 3, the slippery material flowing from the front groove 23 easily flows into the recess 11. The slippery material then spreads in the circumferential direction in the recess 11, and is supplied over a wide area on the underside of the recess 11. Furthermore, since the front end of the rear groove 24 is connected to the recess 11, the slippery material easily flows into the rear groove 24.

[0018] In addition, in the front body groove 23 of this embodiment, a second front body groove 23b connected to the slip material injection port 22 via a communicating groove 27 is formed next to the first front body groove 23a, so that slip material can be efficiently flowed from a single slip material supply device 21 and slip material injection port 22 to multiple front body grooves 23. Furthermore, in this embodiment, the front body groove 23 and the rear body groove 24 are formed on the lower part of the skin plates 5, 9 (on the outer peripheral surfaces of the skin plates 5, 9, on an arc with a central angle of 120° including the lowest point P when viewed in the tunnel cross section), so that the slippery material easily flows into each of the front body grooves 23 and rear body grooves 24 due to its own weight, and frictional force can be efficiently reduced.

[0019] In addition, since the front body groove 23 and the rear body groove 24 are formed in a straight line along the axial direction of the shield body, the straightness of the front body 2 and the rear body 3 can be improved, and the center-bending shield tunneling machine 1 can be excavated in the desired direction.

[0020] Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate design changes are possible within the scope of the present invention. For example, in the above embodiment, the lubricant injection port 22 is formed in four places, and the front body grooves 23 and the rear body grooves 24 are formed with seven each, but the present invention is not limited to this. When the diameter of the shield body is large, the lubricant injection port may be increased to further increase the front body grooves and the rear body grooves, and when the diameter of the shield body is small, the lubricant injection port may be decreased to further decrease the front body grooves and the rear body grooves. In the above embodiment, the cross-sectional shapes of the front and rear grooves 23 and 24 are trapezoidal, but are not limited to this. The bottoms of the grooves may be inclined concavely so that the center of the bottoms of the grooves is deeper, or may be inclined convexly so that the center of the bottoms of the grooves is shallower. The front and rear grooves 23 and 24 extend linearly along the axial direction of the shield body, but are not limited to this. The front and rear grooves 23 and 24 may be made to meander to increase the width of the lubricant supply. [Explanation of symbols]

[0021] 1. Center-bending shield tunneling machine 2 Front body 3 Rear fuselage 5 Skin Plate 9 Skin Plate 11 Recess 21 Slub material supply device 22 Lubricant injection port 23 Front trunk groove 24 Posterior trunk groove 27 Communication groove

Claims

1. In a center-bending shield tunneling machine, the front body is bendable relative to the rear body, a lubricant supplying device for supplying lubricant to an outer periphery of the front body, a lubricant injection port penetrating a skin plate of the front body, and a front body groove formed on an outer periphery of the skin plate along a tunnel axis direction, The lubricant inlet is in communication with the front body groove. This is a center-bending shield drilling machine.

2. The rear end of the front body groove is adjacent to a recess formed between the skin plate of the front body and the skin plate of the rear body.

2. The center-bending shield tunneling machine according to claim 1 .

3. A plurality of the front body grooves are formed, and a communication groove is formed at the front end of the front body groove to communicate the lubricant injection port formed in the front body groove with the adjacent front body groove.

2. The center-bending shield tunneling machine according to claim 1 .

4. A rear body groove is further formed on an outer peripheral surface of the skin plate of the rear body along a tunnel axis direction, The front end of the rear body groove is connected to the recess.

3. The center-bending shield tunneling machine according to claim 2.

5. The front and rear grooves are formed on an arc having a central angle of 120° including the lowest point in a cross-sectional view of the tunnel on the outer circumferential surface of the skin plate.

5. The center-bending shield tunneling machine according to claim 4.

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