JPH0738476Y2 - Rectangular cross section shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rectangular shield shield machine.

[Prior Art] In recent years, it has become difficult to use the ground for the construction of railways, roads, waterways, etc. For this reason, tunnels are underground to be excavated for various constructions. The shield construction method is generally adopted as a construction method for such a large-scale tunnel.

FIG. 4 shows an example of a conventional shield machine, in which a cylindrical shield frame b having a rotating cutter a which rotates in the vertical direction on the front surface is adapted to apply a reaction force to a segment c assembled rearward. By advancing through the reaction force receiving jack d, excavation is performed. In the figure, e is an erector for segment assembly, and f is a screw conveyor for earth removal.

In the shield machine, since excavation is performed by the front rotary cutter a that rotates around the axis of the shield frame b, the tunnel cross-sectional shape that can be excavated by the machine is limited to a circle.

However, the tunnel has a greatly different cross-sectional shape depending on the purpose of use, and a rectangular tunnel is also required. However, when excavating with the conventional shield machine, the tunnel has a circular cross-section. There was a problem that the efficiency was poor because extra parts were excavated.

Therefore, a shield machine for excavating a tunnel having a rectangular cross section has been considered.

[Problems to be solved by the invention] However, in the case of shield tunneling of a tunnel having a rectangular cross section, even if straight tunneling is possible, it is an effective method in terms of curving the tunnel by bending and correcting the direction. Has become an important issue.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a rectangular cross-section shield excavator that facilitates curve excavation and direction correction of a tunnel having a rectangular cross-section.

[Means for Solving the Problems] The present invention is arranged inside the front ends of the left and right side walls of a rectangular shield frame having a rectangular cross section, and is arranged over the entire width in the vertical direction, and is guided by a guide plate to project toward the front outside, The present invention relates to a shield excavator having a rectangular cross section, which is provided with an overdrilling device capable of retracting, and an extra digging device including a drive device for driving the protruding and retracting of the overplate cutter.

[Operation] With the over-plate cutter protruding to the outside of the rectangular shield frame, excavation is performed to over-dig the projecting side of the over-plate cutter, and the rectangular shield frame is directed in the direction of this over-digging. The curve excavation or direction correction is performed by.

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

FIGS. 1 to 3 show an example of the present invention applied to a propulsion type shield excavator. The rectangular shield frame 1 having a rectangular cross-section has a rectangular shield at the front side of the bank head 2 at a right angle to the excavation direction. Two vertical axis cutters 3,3 'extending parallel (vertically) to the left and right side walls of the frame 1 facing each other,
The vertical axis cutter is arranged with a required space in the left-right direction.
The upper and lower ends of the respective rotating shafts 3 and 3 minutes are rotatably supported by the upper and lower bearings 5 and 6 provided on the upper and lower plates of the rectangular shield frame 1, and the intermediate position of the rotating shaft 4 is set to the rectangular shield. An intermediate stage 7 provided integrally with the frame 1 is rotatably supported via bearings 8 and 9.

The vertical axis cutters 3, 3'are attached to the outer circumference of the rotary shaft 4 by means of a cutter arm 11 with a multi-stage cutter blade 10 provided at three positions equidistant in the circumferential direction, the number of which is one. By rotating the vertical cutters 3 and 3 ', the entire cross section of the rectangular shield frame 1 except the intermediate stage 7 can be excavated. Incidentally, the intermediate stage 7 has a pointed shape in order to reduce its own resistance to excavation.

A chain wheel 12 is provided on each of the rotating shafts 4, 4 between the bearings 8, 9 in the intermediate stage 7, and the chain wheel 12 is provided on the rear side of the bulkhead 2 via a chain 13. Cutter drive device 14,1
4'is provided.

The cutter drive devices 14 and 14 'include a vertical drive shaft 16 having a drive sprocket 15 that meshes with the chain 13, a bearing 17 that supports both ends of the drive shaft 16, and a drive shaft 16 through a gear 18. It is configured to include a motor 19 for performing rotational drive. In the figure, 20 is a screw conveyor for soil removal, 21 is a direction control jack that controls the direction of the rectangular shield frame 1 by applying a reaction force to the fume tube 22, and 23 is a manhole provided in the bulkhead 2.

Further, the intermediate stage 7 is formed so that the central portion becomes thin as shown in FIG. 2, and an opening 24 is formed at the rear of the central portion as shown in FIG. The tip of the earth and sand intake portion of the screw conveyor 20 is located in the portion 24.

As shown in FIG. 3, the rectangular shield frame 1 is arranged at the front end portions of the wall surfaces of the left and right side walls 1'over the entire width in the vertical direction, and at the required spread angle outward with respect to the propelling direction of the rectangular shield frame 1. Is provided with plate-like over plate cutters 25, 25 ', and a convex portion 26 formed at the rear end of the over plate cutters 25, 25' penetrates the bulkhead 2 to the rear. And the convex portion 26 and the rear fixing member 27 are connected by drive devices 28, 28 'such as drive cylinders to form overcutting devices 29, 29'.
Further, a guide plate 30 for guiding expansion and contraction of the over plate cutters 25, 25 'is fixed to the bulkhead 2 on the inner side of the tip end portions of the over plate cutters 25, 25' (vertical axis cutters 3, 3'side). Are provided.

According to the above configuration, when the vertical axis cutters 3 and 3'are rotationally driven, the cutter blades 10 provided in multiple stages can excavate the entire cross section of the rectangular shield frame 1 except for the intermediate stage 7.

Therefore, by advancing the rectangular shield frame 1 with the over plate cutters 25, 25 'retracted, the tunnel having a rectangular cross section can be dug.

At this time, by rotating the vertical axis cutters 3 and 3'in opposite directions as shown in FIG. 3, the sand and sand can be scraped inward and effectively directed to the screw conveyor 20.

Also, when making a curve excavation or correcting the direction of a tunnel, the procedure is as follows.

2 and 3 show the case where the tunnel is bent to the right (upward in FIG. 3), and as shown in the figure, the drive device 28 of the digging device 29 on the front left side drives the overpass on the front left side. The plate cutter 25 is projected laterally and excavation is performed.

Then, the portion A indicated by hatching in FIG. 3 is overexposed, and accordingly, the direction control jack 21 adjusts the rectangular shield frame 1 so as to face the overexposed right side (upper side in FIG. 3). , You can do curve digging.

Similarly, the direction of the rectangular shield frame 1 can be corrected.

Further, since the over plate cutters 25, 25 'and the guide plate 30 have a shape that widens toward the front, the vertical axis cutters 3,
In combination with the rotation of 3 ′, the earth and sand can be effectively directed toward the earth and sand intake portion side of the screw conveyor 20.

In the above embodiment, the case of a rectangular cross-section shield excavator having a vertical axis cutter was illustrated, but a rectangular cross-section excavation machine equipped with a plurality of rotary cutters that rotate about an axis parallel to the axis of the shield frame is used. That can be applied to various rectangular cross-section shield machine, such as a shield shield construction method to line the segment other than the propulsion shield type, muddy water shield construction method and other suitable shield machine,
The digging device may be provided on the upper and lower side walls in addition to the left and right side walls of the rectangular shield frame, or the over plate cutter may be divided into a plurality of parts in the width direction so that each of the over plate cutters can be projected by the drive cylinder to be retracted. It goes without saying that various changes can be made without departing from the scope of the present invention.

[Advantages of the Invention] As described above, according to the rectangular cross-section shield machine of the present invention, the over-plate cutter provided on the rectangular shield frame is projected to cause over-digging, and the rectangle is formed in the direction of the over-digging. By facing the shield frame, the insertion resistance to the ground can be reduced due to the simple plate shape, so that it is easy to insert even on solid ground, and the front end of the wall surface of the rectangular shield frame and the support by the guide plate make a large overcut. The amount can be easily obtained, and an excellent effect that the curve excavation and the correction of the direction of the rectangular cross-section shield excavator can be easily performed can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional side view of an embodiment of the present invention, and FIG.
II-II arrow view of the figure, FIG. 3 is a III-III arrow view of FIG. 1, and FIG. 4 is a cut side view showing an example of a conventional shield machine. 1 is a rectangular shield frame, 3 and 3'is a vertical axis cutter, 14 and 1
4'is a cutter drive device, 25, 25 'is an over plate cutter, 26
Is a convex portion, 27 is a rear fixing member, 28, 28 'are drive devices, 29, 2
9'denotes an overditching device and 30 a guide plate.

Claims (1)

[Scope of utility model registration request] 1. An over-plate cutter, which is disposed over the entire width in the vertical direction inside the front ends of the left and right side walls of a rectangular shield frame having a rectangular cross section, and which is guided by a guide plate and can project and retract toward the front outside. And a shield excavator having a rectangular cross section, which is provided with an overdrilling device including a drive device for driving the protrusion and retraction of the over plate cutter.