JPH10184276A - Front excavation rorary body of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of an excavation tool by reducing the rear abrasion of the shell-like excavation tool caused by excavated earth and sand. SOLUTION: A gentle slope is so formed that the rear of a shell bit 3 protrudes the front end side from the circumference of the circumferential ring 4 to the outside, and welding is made at notch sections provided to both end sections of a mounting surface between a bearing plate 30 and the circumferential ring 4 so as to make a smooth continuous surface without having any uneven step in welding beads 80. By the constitution, the shell bit 3 is mounted to the circumferential ring 4 of a shield machine 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a front excavation rotating body of a shield machine which is rotatably attached to a tip of a shield machine which excavates in the soil.

[0002]

2. Description of the Related Art At the tip of a shield machine for excavating in the ground, there is provided a disk-shaped front excavating rotary body for excavating earth mixed with gravel. The outline of a front excavation rotating body of a conventional shield machine will be described with reference to the drawings. FIG. 3 is a side view of the shield machine, and FIG. 4 is a front view of the shield machine. As shown in these figures, a front excavation rotating body 2 is rotatably mounted integrally with a drive shaft 7 at a distal end of a cylindrical shield excavator 1 main body. Front excavation rotating body 2
A plurality of shell bits, which are shell-shaped excavating tools, are mounted on the front surface of the vehicle so as to protrude toward the front side along the outer peripheral wheel 4. A number of tooth bits 6 which are excavated steel blades are mounted along the direction. The shell bit 3 and the teeth bit 6 excavate the earth and sand that comes into contact with the front side by the front excavation rotating body 2 moving forward while rotating. In addition, since the front excavation rotating body 2 can rotate in the reverse direction, the shell bit 3 and the teeth bit 6 are mounted symmetrically with respect to the drive shaft 7.

FIG. 5 is an enlarged view of the shell bit 3,
(A) is a top view, (b) is a front view, and (c) is a central sectional view. As shown in these figures, shell bit 3
The upper edge portion of the support plate 30 is provided with a hard layer build-up portion 31 having wear resistance, and a plurality of super steel chips 32 are embedded in the hard layer build-up portion 31 in parallel. FIG. 6 is a partial cross-sectional view of the vicinity of the tunnel of the front excavation rotating body 2 during the excavation work. In the figure, the lower side is the excavation direction, and the upper side is the shield machine 1 body direction. The rotation of the drive shaft 7 causes the outer peripheral wheel 4 of the front excavation rotating body 2 to rotate in a direction perpendicular to the plane of the paper, and the super steel tip 32 at the tip of the shell bit 3 slides on the earth and sand at the corner at the tip of the tunnel to contact it. Shaving off. Since the shell bit 3 must be firmly attached to the outer ring 4, the support plate 30 of the shell bit 3 is welded to the outer ring 4 with a step, and is welded to the inner and outer joints. A bead 80 is formed.

[0004]

As described above, the sand and steel scraped by the super steel tip 32 at the tip of the shell bit 3 in sliding contact with the excavated earth and sand surface is applied to the inside and outside of the shell bit 3 at the tip of the shell bit 3. It is separated and discharged backward. Among them, the sediment discharged to the outside is as shown by the sediment flow SF in FIG.
It is sent from the outside of the back of the support plate 30 through the outside of the outer peripheral wheel 4 of the front excavation rotator 2 into the sediment inside the rear shield machine 1 main body.

Since the distance between the outer edge 1a of the tip of the shield machine 1 and the outer edge of the rear end of the outer ring 4 is not so large, the outer edge of the outer ring 4
The excavated earth and sand easily accumulates in the process of reaching the outer edge of the rear end of the shell bit 3. The back surface of the support plate 30 is worn away, and the portion shown by the thin oblique lines in FIG. 6 as the back wear portion 30a is worn away. In such a state, the welding strength of the shell bit 3 to the outer peripheral wheel 4 is greatly reduced, and the shell bit 3 falls off the outer peripheral ring 4 due to contact or sliding contact with excavated earth and sand. There is a possibility that secondary damage to the device may occur. The present invention provides a front excavation rotary body of a shield machine in which the occurrence of such problems in the prior art is prevented and the back wear of the shell-shaped excavation tool due to excavated earth and sand is reduced, thereby reducing the use deterioration of the excavation tool. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a shell-shaped excavating tool mounted so as to protrude forward of an outer peripheral ring of a front excavating rotating body of a shield machine. The outer peripheral surface of the outer peripheral ring becomes a smooth continuous surface at the welded part, and the back surface is welded to the front surface of the outer peripheral ring so as to form a gentle slope so that the tip side protrudes outward from the outer peripheral surface of the outer peripheral ring It was done.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial cross-sectional view near the tunnel of a front excavation rotating body during excavation work according to an embodiment of the present invention,
2A and 2B are enlarged views of the shell bit, in which FIG. 2A is a top view, FIG. 2B is a front view, and FIG. The same reference numerals are given to portions which are the same as or can be regarded as the same as those in the conventional example, and redundant description thereof will be omitted. As shown in FIG. 2C, in this embodiment, the mounting angle of the super steel tip 32 with respect to the support plate 30 of the shell bit 3 is slightly sharper than the conventional one, and Notches for pooling the weld bead 80 are provided at both ends of the mounting surface. A notch corresponding to the notch of the support plate 30 is also provided at the outer edge of the front end of the outer peripheral wheel 4. Then, as shown in FIG. 1, the mounting state of the shell bit 3 to the outer peripheral wheel 4 forms a gentle slope such that the rear surface of the shell bit 3 projects outward from the outer peripheral surface of the outer peripheral wheel 4 toward the front end, The support plate 30 and the outer peripheral ring 4 are welded at notches provided at both ends of the mounting surface so that the welded portion has a smooth continuous surface with no steps.

[0008] By adopting such an attached state,
As shown by the sediment flow SF, in this embodiment, the excavated sediment discharged to the back side of the support plate 30 of the shell bit 3 has a wider flow path as it descends downstream (toward the shield excavator 1 main body side). Even the earth and sand of this kind flows out immediately downstream, and is not sandwiched between the back surface of the support plate 30 and the inner surface of the gallery, so that the back surface of the support plate 30 is not worn. Therefore, the use deterioration of the support plate 30 of the shell bit 3 can be significantly reduced and the durability of the front excavation rotating body can be increased.

[0009]

As described above, according to the present invention, the shell-shaped excavating tool has a smooth continuous surface between the rear surface and the outer peripheral surface of the outer peripheral ring at the welded portion, and the rear surface has a tip extending from the outer peripheral surface of the outer peripheral ring to the front end. The outer ring is welded to the front surface of the outer peripheral ring so as to form a gentle slope so that the side protrudes outward, so that the back surface wear of the shell-shaped excavating tool due to excavated earth and sand is reduced, so that the excavating tool can be used. The durability of the front excavation rotating body of the shield machine can be increased with less deterioration.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a front excavation rotating body near a tunnel during excavation work according to an embodiment of the present invention.

FIG. 2 is also an enlarged view of a shell bit, and (a)
Is a top view, (b) is a front view, and (c) is a central sectional view.

FIG. 3 is a side view of the shield machine.

FIG. 4 is a front view of the shield machine.

FIG. 5 is an enlarged view of a shell bit according to a conventional example,
(A) is a top view, (b) is a front view, and (c) is a central sectional view.

FIG. 6 is a partial cross-sectional view of the front excavation rotating body near the tunnel during the excavation work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Front excavation rotating body 3 Shell bit (shell-shaped excavation tool) 4 Outer ring 5 Beam 6 Teeth bit (excavated steel blade) 30 Support plate 30a Back wear part 31 Hard layer buildup part 32 Super steel tip 80 Weld bead

Claims (1)

[Claims] 1. A plurality of beams having a plurality of excavated steel blades attached to the front end of a shield excavator for excavating in the soil and having a large number of excavated steel blades attached to a front surface thereof. In a front excavation rotary body of a shield machine including a plurality of outer shells to which a plurality of shell-shaped excavating tools are attached so as to protrude, the back surface of the shell-shaped excavating tool is welded to an outer peripheral surface of the outer peripheral ring. Characterized in that the rear surface is welded to the front surface of the outer peripheral ring so as to form a gentle slope so that the tip side projects outward from the outer peripheral surface of the outer peripheral ring. Front excavation rotating body.