JP2574651Y2 - Shield excavator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator suitable for removing an underground obstacle appearing in front of a digging direction, for example, in a shield method for excavating a sewer tunnel or a railway tunnel. It is.

[0002]

2. Description of the Related Art As is well known, a shield method is a method of excavating the ground with a cutter device provided at the front of a shield excavator having a skin plate having an outer cylindrical shape, and forming a segment which is a cylindrical divided body in the skin plate. Assemble, furthermore, take a reaction force at the front end of this segment and extend the propulsion jack inside the shield excavator to propel the entire shield excavator forward, and repeat these steps to build a tunnel underground It is a construction method. When a tunnel is excavated by such a shield method, an underground obstacle such as a drain material or a bedrock may appear in front of the excavation direction.

Conventionally, in such a case, after the ground improvement treatment is performed from the ground surface in advance, the ground is dug by a shield excavator, and when the shield excavator arrives immediately before an underground obstacle, The shield excavator was stopped excavating, and an operator came in front of the shield excavator to cut underground obstacles. Then, after removing the underground obstacle from the front of the shield excavator, the excavation of the shield excavator was restarted to excavate the tunnel.

[0004]

However, the conventional methods for cutting and removing underground obstacles as described above have the following problems. First, since the ground improvement treatment is performed, the construction cost and the construction period increase. In addition, since the excavation of the shield excavator is stopped and the underground obstacle is removed, the construction period is prolonged from this point as well. Furthermore, when an operator goes out in front of the shield excavator to remove an underground obstacle, the operation is a manual operation in a closed space, which is a dangerous operation and a bitter operation. The present invention has been made in consideration of the above points, and provides a shield excavator capable of safely and easily removing an underground obstacle without increasing the construction cost and construction period. With the goal.

[0005]

According to the present invention, there is provided a shield excavator having a movable hood that can move back and forth in the direction of digging on the outside of the cut-spoke, wherein the movable hood has an underground obstacle cutting mechanism. The underground obstacle cutting mechanism is provided, comprising: a drive source installed in the movable hood; and a cutter detachably attached to the drive source and rotationally driven by the drive source. The above-mentioned shield excavator is a means for solving the above-mentioned problem.

[0006]

In the present invention, the movable hood of the shield excavator is moved forward in the excavation direction, and the underground obstacle in front of the shield excavator is cut by the underground obstacle cutting mechanism provided in the movable hood. Cutting of the underground obstacle by the underground obstacle cutting mechanism is performed by advancing the movable hood and rotating the cutter by the driving force of the driving source. The cutter to be mounted on the drive source is selected to be suitable for the underground obstacle to be cut.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 2 shows the shield excavator 1 according to the present invention. In FIG. 2, reference numeral 2 denotes a skin plate having an outer cylindrical shape, and reference numeral 3 denotes a shield excavator 1 for cutting excavated soil.
Is a screw jack for discharging the shield excavator forward, and 5 is an erector mechanism for assembling the segment S to the peripheral wall of the tunnel T.

As shown in FIGS. 1 and 2, the shield excavator 1 has a disk-shaped rotary cutter 6 provided in front of a skin plate 2 and a semicircular arc inside the skin plate 2. A removable hood 7 is provided.

The rotary cutter 6 is provided with a cut-spoke 8, which is formed in a radial shape from the center and has a trapezoidal concave portion (FIG. 3) in cross section.
8,... Are formed. Each of these Katas Spokes 8
Are provided with cutter bits 9, 9,... For cutting ground. Also, the cut-spoke body 8a, 8
Each of a and 8a is provided with a telescopic part 8b that expands and contracts in the diameter direction. Non-adjacent 2 of the cutter spoke bodies 8a
The book is provided with a box-shaped internal cutter mechanism 8c.
Each internal cutter mechanism 8c has a circular saw mechanism for cutting an underground obstacle located at the center of the rotating radius of the rotating cutter 6, and a radial distance from the center of the rotating cutter 6 of the cutter spoke body 8a. Are provided at different positions from each other. The circular saw mechanism is provided in a slit 8d opening on the front surface of the internal cutter mechanism 8c so as to be able to protrude and retract in the excavation direction.

As shown in FIGS. 1 and 2, the movable hood 7 is provided with an underground obstacle cutting mechanism 10. The underground obstacle cutting mechanism 10 is configured such that an underground obstacle cutting cutter 11 that is driven to rotate about an axis parallel to the axis of the rotary cutter 6 projects partly from the movable hood 7 forward in the excavation direction. , Are provided at equal intervals. The all-round obstacle cutting cutter 11 is provided so as to be detachable from a cutter driving motor (drive source) 12 and is configured to be rotationally driven by the cutter driving motor 12.
3 to 5 show the underground obstacle cutting cutter 11a,
3 shows tooth shapes of 11b and 11c, FIG. 3 shows a tooth body formed in a conical shape, FIG. 4 shows a tooth body formed in a bottomed cylindrical shape, and has a blade at a tip, FIG. 5 shows a U-shaped section having a blade at its tip. Then, the underground obstacle cutting mechanism 10 attaches an underground obstacle cutting cutter 11 having a tooth shape suitable for the underground obstacle to be cut.

As shown in FIG. 2, the movable hood 7 is configured to be movable back and forth in the direction of excavation of the shield excavator 1 by a driving jack 13 provided at the rear. With this structure, when the underground obstacle cutting cutter 11 is used, the underground obstacle cutting cutter 11 is advanced forward of the rotary cutter 6, while when the underground obstacle cutting cutter 11 is not used, the underground obstacle cutting cutter 11 is used. Rotating cutter 6 with cutting cutter 11
And retracted to the rear of the housing.

Next, a method of removing an underground obstacle by the shield excavator 1 having the above configuration will be described.
First, at the time of normal excavation, the telescopic portion 8b of the cut spoke 8 of the rotary cutter 6 shown in FIG. The rotary cutter 6 is rotationally driven by a drive mechanism 6a to excavate the ground.

When an underground obstacle appears in front of the excavation direction, the rotation of the rotary cutter 6 is first stopped, and the telescopic portion 8b is contracted so that the movable hood 7 can move forward.

Next, the movable hood 7 is advanced forward of the rotary cutter 6 by the drive jack 13 shown in FIG. Cut things. Then, after stopping the rotation of the cutter 11 for cutting the obstacle in each place, the drive jack 13 is contracted, and the movable hood 7 is retracted to the rear of the rotary cutter 6.

Next, the circular saw shown in FIG.
And the rotary cutter 6 is driven to rotate, and after the telescopic portion 8b of the cutter spoke 8 of the rotary cutter 6 is extended, the rotary cutter 6 is driven to rotate by the drive mechanism 6a. Then
Normal excavation is performed by the action of the rotary cutter 6, and the subsurface obstacle cut by the subsurface obstacle cutting mechanism 10 is further finely cut by the circular saw of the internal cutter mechanism 8c. Then, the cut underground obstacle is taken into the shield excavator 1 together with the shaving, and discharged from the screw conveyor 3 to the rear of the shield excavator 1.

After removing the underground obstacle appearing in front of the excavating direction of the shield excavator 1 in this way, the rotation of the circular saw is stopped and the circular saw is stored in the internal cutter mechanism 8c. Thereafter, the excavation of the ground is continued by the rotary cutter 6 to construct the tunnel T.

As described above, the shield excavator 1
Then, the underground obstacle appearing in front of the shield excavator 1 is removed from the underground obstacle cutting mechanism 1 provided on the movable hood 7.
Automatically disconnect at 0. Therefore, it is not necessary to improve the ground to remove the underground obstacle, it is not necessary to stop the excavation of the shield excavator 1, and furthermore, it is possible to abolish the operation of removing the underground obstacle by the operator. Accordingly, underground obstacles can be safely and easily removed without increasing costs and lengthening the construction period.

In the underground obstacle cutting mechanism 10, the underground obstacle cutting cutter 11 is detachable from the cutter drive motor 12, so that the underground obstacle cutting mechanism 10 can be easily replaced with an optimal one for cutting an underground obstacle to be cut. By doing so, the efficiency of cutting underground obstacles is improved and the structure is simple, so that the manufacturing cost can be kept low and the cost required for cutting underground obstacles can be reduced.

On the other hand, similarly to the underground obstacle cutting mechanism 10, the internal cutter mechanism 8c provided with a circular saw is advanced only when used, and the circular saw is stored in the internal cutter mechanism 8c when not in use. At the time of excavation of the ground, the circular saw can be protected, and blockage and breakage due to the adhesion of earth shaving can be prevented.

In the shield excavator 1, if the tooth shape of the underground obstacle cutting cutter 11 to be attached to the underground obstacle cutting mechanism 10 is suitable for the underground obstacle to be cut as shown in FIGS. It may be formed in a form other than that shown in FIG.

[0021]

As described above, according to the shield excavator of the present invention, the underground obstacle appearing in front of the shield excavator can be detachably attached to the underground obstacle cutting mechanism provided on the movable hood. Cutting with a cutter eliminates the need to improve the ground to remove underground obstacles, stop the excavation of shielded excavators, and eliminate the work of removing underground obstacles by workers. It is possible to remove underground obstacles safely and easily without incurring an increase in cost and lengthening the construction period, and it is most suitable for cutting underground obstacles to cut the cutter. By replacing the underground obstacle, the efficiency of cutting the underground obstacle can be easily improved, and the underground obstacle cutting mechanism has a simple configuration, so that the cost can be further reduced. Excellent An effect.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a shield excavator according to the present invention.

FIG. 2 is a side sectional view showing the shield excavator according to the present invention.

FIG. 3A is a side view of a conical underground obstacle cutting cutter. (B) It is a front view of said (a).

FIG. 4 (a) is a side view of another example of a bottomed cylindrical underground obstacle cutting cutter having a bottom. (B) It is a front view of said (a).

FIG. 5A is a side view of another example of an underground obstacle cutting cutter having a U-shaped cross section. (B) It is a front view of said (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 7 Movable hood 10 Underground obstacle cutting mechanism 11, 11a, 11b, 11c Underground obstacle cutting cutter 12 Drive source (cutter drive motor)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroyuki Kawaguchi, 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Hiroshi Tate 1-2-3, Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (72) Inventor Yoshihiro Taniguchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (56) References Real Opening Sho-56-64492 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) E21D 9/06 302 E21D 9/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A shield excavator having a movable hood that can move back and forth in the direction of excavation outside a cutter spoke, wherein the movable hood is provided with an underground obstacle cutting mechanism. The shield excavator is characterized in that the cutting mechanism comprises a drive source installed in the movable hood, and a cutter detachably attached to the drive source and driven to rotate by the drive source.