JPH0718314B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention cuts and advances an obstacle such as a course, steel material, concrete pillars, rocks, etc. during excavation of a shield tunnel. Shield excavator that can be used (Prior art) Conventionally, a partition wall was provided in the front end of the shield tube, the cutter shaft was movably supported in the front and rear direction at the center of the partition, and the cutter was radially projected at the tip of the cutter shaft. Then, the cutter shaft is moved in and out to move the cutter into and out of the excavation and kneading chamber on the front side of the partition wall, the excavated soil is kneaded with the mud in the excavation and kneading chamber, and is carried out by the screw conveyor. Shield machine has been developed.

(Problems to be solved by the invention) This conventional ground-blending type shield excavator does not plan to excavate hard ground such as rock, so it was left in the ground during underground excavation during excavation. If there are obstacles such as steel materials, concrete piles, or natural rocks, it becomes impossible to proceed with the digging, and there is the problem that the shaft must be dug and removed from the surface each time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a shield machine capable of cutting an obstacle and proceeding.

(Means for Solving Problems) The shield machine of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is characterized by extending the tip of a cylindrical shield cylinder. The rotating ring is installed in a fixed arrangement so as to be movable in the extension direction, the cutting blade is integrally provided at the tip of the rotating ring, and the cutter spoke for excavation provided at the tip of the shield cylinder can be reciprocated back and forth. The front end of the cutter spoke is engaged with the inner surface of the rotary ring so that the rotary ring can rotate and move back and forth together with the cutter spoke, and a large number of front faces of the cutter spoke toward the front side. A high-pressure water jet nozzle is provided, and high-pressure water containing grinding particles can be jetted freely by the jet nozzle.

(Operation) During normal excavation, this shield machine excavates the natural ground by excavating the ground by rotating the cutter spoke while rotating the cutter spoke in the state where the engagement between the cutter spoke and the rotary ring is released, To retreat and rotate to knead the cut soil and discharge it.

When hitting an obstacle such as steel or concrete block during excavation, the cutter ring is drawn into the rotating ring, and the tip of the cutter spoke is engaged with the inner surface of the rotating ring to move forward while rotating. The obstacle is cut into a circle by the cutting blade at the tip of the. At the same time as this cutting operation, high pressure water containing grinding particles is jetted from the high pressure water jet nozzle to cut the obstacle into small pieces.

(Example) Next, an example of an embodiment of the present invention will be described with reference to the drawings.

In the figure, 10 is a cylindrical shield cylinder, 11 is a segment assembly device, 12 is a cylindrical lining wall assembled by segments, 13 is a reaction force against the lining wall 12 and pushes out the shield cylinder 10. It's a jack.

A partition 14 is provided in the front end of the shield cylinder 10 to block the front and back, and the front side thereof serves as an excavation and kneading chamber.

A bearing 16 is fixed to the center of the partition wall 14, and a cutter shaft 17 is axially slidably mounted on the bearing 16.

Four cutter spokes 18, 18, ... Are radially fixed to the tip of the cutter shaft 17. Each cutter spoke 18 has a cutter bit 19 on the front side and a kneading bit 20 on the rear side. A copy cutter 21 is provided at the tip end portion so as to be able to move in and out in the axial direction, and is moved in and out by a hydraulic cylinder 22 inside a cutter spoke 18.

The rear end of the cutter shaft 17 is rotatably and axially immovably connected to the drive frame 23 so that it can be rotationally driven by the hydraulic motor 24 supported by the drive frame 23. Has become.

The drive base 23 is supported so as not to be rotatable with respect to the shield cylinder 10 and movable in the axial direction, and is reciprocated in the axial direction of the cutter shaft 17 by the hydraulic cylinder 25.

A screw conveyor 26 for discharging excavated soil is connected to the front surface of the bottom of the obstacle 14, and an obstacle take-out window 26a is provided on the base end side surface of the outer cylinder thereof. This window 26a is normally closed by a cover plate.

At the tip of the shield tube 10, a rotating ring 30 having a cylindrical extension is installed rotatably and movably in the front extension direction of the shield tube 10.

A cutting blade 31 is fixed to the peripheral surface of the tip of the rotating ring 30. Further, on the inner surface of the rotary ring 30, a plurality of recessed grooves 32 for engaging the cutter spokes are formed at least at two locations which are symmetrical with respect to the axial center at intervals in the axial direction. And
Rotating ring 30 with cutter spokes 18 as shown in FIG.
By pulling in, the tip of the copy cutter 21 is engaged in the groove 32 by protruding the copy cutter 21 with the tip facing the groove 32, by operating the cutter spokes 18 in this state, The rotating ring 30 is adapted to be operated with this.

On the other hand, in the cutter bit 19 of the cutter spoke 18, as shown in FIG. 3, a nozzle inlet / outlet hole 33 communicating with the inside of the cutter spoke 18 is opened, and the high-pressure water jet nozzle 34 is located in the front of the nozzle inlet / outlet hole 33. The nozzle 34 is adapted to be moved in and out by a hydraulic cylinder 35 housed in its back. The water supply pipe 36 to the nozzle 34 is led out to the rear end through the inside of the cutter shaft 17, and the water supply pipe on the rear side from the rear end position of the cutter shaft 17 is normally disconnected.

The shield machine configured in this way is normally the first
As shown in the figure, while rotating the cutter spokes 18 in the same manner as in the conventional case, the shield cylinder 10 is moved forward while moving forward and backward to excavate the ground and knead the ground, and the lining wall 12 is sequentially formed backward with segments. To extend and dig.

In the course of this excavation, when the obstacle A hits the obstacle A as shown in FIG. 4 (A), the advance of the shield cylinder 10 is stopped, the cutter spokes 18 are drawn into the tip of the rotary ring 30, and the tip is recessed. The copy cutter (21) is projected so as to face the groove (32), and its tip is inserted into the groove (32).

In this state, as shown in Fig. 4 (b), the cutter spokes
By rotating 18 and moving it forward, rotating ring 30
Moves forward while rotating.

At the same time, a high pressure water pressure feed device (not shown) containing abrasive grains is connected to the water supply pipe 36, and the tip of the nozzle 34 is projected forward of the cutter bit 19 to inject high pressure water containing abrasive grains. As a result, the obstacle A cut at the tip between the rotating rings 30 is shredded. Then, the shredded obstacle A is taken out from the window 26a on the side surface of the screw conveyor 26.

In this way, the obstacle A is cut by an amount corresponding to the path of the shield tube 10, shredded and taken out, and then the normal excavation is performed again.

(Effects of the Invention) As described above, the shield machine of the present invention extends the rotating ring from the shield cylinder while rotating it, and cuts the obstacle in a circular shape at the tip thereof, and at the same time, grinds particles from the nozzles in front of the cutter spokes. By making it possible to inject high-pressure water containing water, obstacles such as steel, concrete, or rock will be finely cut and removed, and the shield excavator itself can remove obstacles, shortening the construction period. And the construction cost is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a shield excavator according to an embodiment of the present invention, FIG. 2 is a sectional view showing an engaged state of a copy cutter and a rotary ring, and FIG. 3 is a sectional view taken along line BB in FIG. Figure, 4th
9A and 9B are cross-sectional views of the obstacle removal process. 10 …… Shield cylinder, 11 …… Segment assembly device, 12 ……
Lining wall, 13 …… jack, 14 …… bulkhead, 16 …… bearing, 17
…… Cutter shaft, 18 …… Cutter spoke, 19 …… Cutter bit, 20 …… Kneading bit, 21 …… Copy cutter, 23 …… Driving stand, 22, 25, 35 …… Hydraulic cylinder, 24 …… Hydraulic motor, 26 …… Screw conveyor,
26a …… Window, 30 …… Rotating ring, 31 …… Cutting blade, 32 ……
Groove, 33 …… Nozzle inlet / outlet hole, 34 …… Nozzle, 36 …… Water supply pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Furuta 2-8, Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Ken Ogasa 2-2-8, Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Inventor Toshinori Teramoto 2-8 Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (56) Reference JP-A-63-255497 (JP, A) JP Sho 59-15189 (JP, A)

Claims (1)

[Claims] 1. A rotating ring is provided movably in the extension direction in a position where a tip of a cylindrical shield tube is extended, and a cutting blade is integrally provided at the tip of the rotating ring.
Also, the cutter spokes for excavation provided at the tip of the shield cylinder are reciprocally movable back and forth, the tips of the cutter spokes are engaged with the inner surface of the rotating ring, and the rotating ring is rotated together with the cutter spoke and back and forth. A shield machine, which is movable and has a large number of high-pressure water jet nozzles on the front surface of the cutter spoke toward the front side so that high-pressure water containing abrasive grains can be jetted freely by the jet nozzles.