JPH0667599U - Shield excavator - Google Patents

Abstract

(57) [Summary] [Construction] An outer blade 6 is formed on the tip of the skin plate 2 of the shield excavator 1, and an inner blade 8 is formed on the tip of the outer peripheral edge of the rotating cutter 7 rotating in the skin plate 2. However, the outer blade 6 and the inner blade 8 respectively have an annular blade body 6
The protrusions 6b and 8b are formed in the excavating direction at regular intervals in the circumferential direction of a and 8a, and the protrusion 8b of the inner blade 8 is inside the protrusion 6b of the outer blade 6 when the rotary cutter 7 rotates. It was arranged to pass through. [Effect] The underground obstacle can be removed safely and easily without increasing the construction cost and the construction period.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shield excavator suitable for removing underground obstacles appearing in the forward direction of excavation in a shield construction method for excavating a sewer tunnel, a railway tunnel, or the like.

[0002]

[Prior art]

 As is well known, the shield construction method is a shield having a skin plate with a cylindrical outer shape. While excavating the natural ground with a cutter device provided in the front part of the excavator, a segment that is a cylindrical divided body is assembled in the skin plate. This is a method of constructing a tunnel in the ground by propelling the entire shield excavator forward by extending the propulsion jack inside the shield excavator by applying a reaction force to the front end of the segment and repeating these steps. . When excavating a tunnel in such a shield construction method, an underground obstacle such as a drain material or bedrock may appear ahead of the excavation direction.

Conventionally, in such a case, after performing ground improvement treatment from the ground surface in advance, the ground was excavated by a shield excavator, and the shield excavator arrived just before an underground obstacle. At that time, the excavation of the shield excavator was stopped, and the worker went out in front of the shield excavator and cut the ground obstacle. 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]

[Problems to be solved by the device]

 However, the following problems exist in the conventional removal of underground obstacles as described above. First, since the ground improvement treatment is performed, the construction cost and construction period increase. Moreover, since the excavation of the shield excavator is stopped and the underground obstruction is removed, the construction period will be prolonged from this point as well. Furthermore, when a worker comes out in front of the shield excavator and removes an underground obstacle, it is a labor-intensive work because it is a manual work in a closed space, and it is a difficult work. The present invention has been made in consideration of the above points, and provides a shield excavator that can safely and easily remove underground obstacles without increasing the construction cost and construction period. The purpose is to

[0005]

[Means for Solving the Problems]

 The invention according to claim 1 is characterized in that an outer blade is formed at a tip portion of a skin plate of a shield excavator, and an inner blade is formed at a tip portion of an outer peripheral edge of a rotating cutter rotating in the skin plate. Each of the outer blade and the inner blade has a structure in which protruding portions are formed in the excavating direction at regular intervals in the circumferential direction of the annular blade body, and the protruding portion of the inner blade is externally formed when the rotary cutter rotates. It is characterized in that it is arranged so as to pass through the inside of the protruding portion of the blade.

According to a second aspect of the invention, in the shield excavator according to the first aspect, at least a side edge in a rotational direction of the protruding portion of the inner blade is oriented in a direction opposite to a rotational direction from a tip portion to a base portion. It is characterized in that it has a structure having an inclined surface.

[0007]

[Action]

 According to the first aspect of the present invention, the outer blade is formed on the tip of the skin plate of the shield excavator, and the inner blade is formed on the tip of the outer peripheral edge of the rotary cutter rotating in the skin plate. Each of the inner blades has a structure in which protrusions are formed in the excavation direction at regular intervals in the circumferential direction of the annular blade body, and when the rotary cutter rotates, the protrusions of the inner blade are located inside the protrusions of the outer blade. By arranging so as to pass through, the underground obstacle in front of the shield excavator is cut by the outer and inner blades.

According to the second aspect of the present invention, the protruding portion of the inner blade has a configuration in which at least a side edge in the rotation direction has an inclined surface that is inclined in a direction opposite to the rotation direction from the tip portion toward the base portion. When the rotary cutter rotates, the protrusion of the inner blade draws the underground obstacle toward the base side.

[0009]

【Example】

 The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 shows a shield excavator 1 according to the present invention. In FIG. 1, reference numeral 2 is a skin plate having an outer cylindrical shape, 3 is a screw conveyor for discharging the excavated soil to the rear of the shield excavator 1, 4 is a propulsion jack for advancing the shield excavator, and 5 is It is an erector mechanism for assembling the segment S on the peripheral wall of the tunnel T.

As shown in FIG. 2 (a), the shield excavator 1 is provided with an outer blade 6 that extends in the axial direction of the skin plate 2 along the peripheral edge of the skin plate 2. As shown in FIG. 2 (b), the outer blade 6 is formed by projecting projecting portions 6 b, 6 b, ... At the circumferential edge of the annular blade body 6 a at regular intervals. The protruding portion 6b has a certain size and extends in the excavating direction, and the tip portion 6c thereof has a mountain-shaped protruding shape. The base 6d between the protrusions 6b and 6b has a shape curved in the direction opposite to the excavation direction. A sharp blade portion 6e is formed on a continuous peripheral edge of the base portion 6d and the protruding portion 6b of the blade body 6a.

On the other hand, as shown in FIG. 1, tool bits 7a, 7a, ... Are fixed to the rotary cutter 7 provided in the front part of the skin plate 2, and the rotary cutter 7 is driven to rotate. A drive mechanism (not shown) is provided. As shown in FIG. 2A, an inner blade 8 protruding in a direction parallel to the protruding direction of the outer blade 6 is provided at the tip of the outer peripheral edge of the rotary cutter 7. As shown in FIG. 2 (b), the inner blade 8 is formed by projecting projecting portions 8b, 8b, ... At the edge portion of the blade body 8a at intervals corresponding to the outer blade 6 in the circumferential direction. It is a thing. The inner blade 8 has a projecting portion 8b whose contour is formed in a semicircular shape at the tip portion 8c, and has a shape that is constricted from the tip portion 8c toward the base portion 8d between the projecting portions 8b and 8b. The base portion 8d has a curved shape in a direction opposite to the excavation direction. Further, a sharp blade portion 8e is formed on the continuous peripheral edge of the base portion 8d and the protruding portion 8b. The inner blade 8 is arranged so that the protruding portion 8b passes inside the protruding portion 6b of the outer blade 6 when the rotary cutter 7 rotates.

When the underground excavation appears in front of the tunneling direction while the tunnel T is being excavated by using the shield excavator 1 having the above-described configuration, a drive mechanism (not shown) is provided inside the outer blade 6. ) Is used to rotate the rotary cutter 7, and the underground blade is cut by the outer blade 6 and the inner blade 8 having sharp blade portions 6e, 8e. At this time, as shown in FIG. 2 (b), the inner blade 8 has a constricted shape from the tip portion 8c to the base portion 8d, so that an underground obstacle is prevented from escaping at the time of cutting, and the base portion 8d It can be pulled to the side to reliably cut off underground obstacles.

As described above, in the shield excavator 1, the outer blade 6 is formed at the tip of the skin plate 2, and the inner blade 8 is provided at the tip of the outer peripheral edge of the rotary cutter 7 rotating in the skin plate 2. Is formed and the underground obstacle in front of the shield excavator 1 is automatically cut by the outer blade 6 and the inner blade 8. Therefore, it is not necessary to improve the ground in order to remove the underground obstacle, and it is not necessary to stop the excavation of the shield excavator 1. As a result, it is possible to safely and easily remove the underground obstacle without increasing the construction period and increasing the cost. Further, since the protruding portion 8b of the inner blade 8 is configured so as to be constricted from the tip portion 8c toward the base portion 8d, the protruding portion 8b of the inner blade 8 causes an underground obstacle when the rotary cutter 7 rotates. It is possible to reliably cut off underground obstacles.

In the present embodiment, the shape of the inner blade 8 is configured so as to be constricted from the tip portion 8c toward the blade body 8a, but if the rotary cutter 7 is structured to rotate only in one direction. The same effect can be obtained even if only the side edge of the inner blade in the rotation direction has an inclined surface that inclines in the direction opposite to the rotation direction from the tip to the base.

[0015]

[Effect of device]

 As described above, according to the shield excavator of claim 1, the outer blade is formed at the tip of the skin plate, and the inner blade is formed at the tip of the outer peripheral edge of the rotating cutter rotating in the skin plate. Then, the underground obstacle in front of the shield excavator is automatically cut by the outer and inner blades. Therefore, it is not necessary to improve the ground in order to remove the underground obstacle, and it is not necessary to stop the excavation of the shield excavator. As a result, underground obstacles can be removed safely and easily without increasing the construction period and increasing the cost.

According to the shield excavator of the second aspect, the protruding portion of the inner blade has an inclined surface in which at least the side edge in the rotational direction inclines in the direction opposite to the rotational direction from the tip to the base. With this configuration, when the rotary cutter rotates, the protrusion of the inner blade pulls the underground obstacle toward the base side, and the underground obstacle can be reliably cut.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a shield excavator according to the present invention.

FIG. 2 is a front sectional view and a bottom view showing an outer blade and an inner blade according to the present invention.

[Explanation of symbols]

 1 Shield Excavator 2 Skin Plate 6 Outer Blade 7 Rotating Cutter 8 Inner Blade 6a, 8a Blade Main Body 6b, 8b Projection 8c Tip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideki Hagiwara, 1-3 Hideba Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Hiroyuki Kawaguchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hiroshi Tate 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Innovator Sadahiro Taniguchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. An outer blade is formed on a tip portion of a skin plate of a shield excavator, and an inner blade is formed on a tip portion of an outer peripheral edge of a rotating cutter rotating in the skin plate. Each of the inner blades has a configuration in which projecting portions are formed in the excavating direction at regular intervals in the circumferential direction of the annular blade body, and when the rotary cutter rotates, the projecting portion of the inner blade is inside the projecting portion of the outer blade. A shield excavator characterized by being arranged so as to pass through. 2. The shield excavator according to claim 1, wherein the protruding portion of the inner blade has an inclined surface in which at least a side edge in a rotation direction inclines in a direction opposite to a rotation direction from a tip portion to a base portion. It is said that the shield excavator is characterized.