JP2010065415A - Cutter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutter device in which the life of an outer peripheral ring is extended, in a construction over a super-long distance. <P>SOLUTION: This cutter device 1 is provided at the front of a shield frame 2 for cutting a heading by rotatingly driving. A plurality of protective bits 6 for preventing the outer peripheral ring 4 from being worn are installed on the outer peripheral surface of the outer peripheral ring 4 of the cutter device 1 at intervals in the circumferential direction. The projecting heights of the protective bits 6a-6c from the outer peripheral ring 4 are different from each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cutter device that is provided at a front portion of a shield frame and is driven to rotate to cut a face.

  2. Description of the Related Art A shield machine for digging a tunnel in the soil is provided with a cutter device for cutting a cutting face by rotational driving at the front part of a shield frame. The cutter device has, for example, an outer ring that is connected and supported by a plurality of spokes, and a number of cutter bits for cutting the face are provided on the front surface of the spokes.

  The digging distance of the shield machine is gradually increasing, and the outer circumferential surface of the outer ring that only contacts the natural ground is also worn by the flow of earth and sand after excavation, the drilling diameter becomes smaller and the shield machine can not advance. Sometimes.

  For this reason, when performing long-distance excavation in the conventional cutter apparatus, hardening build-up welding is performed on the outer ring or a bit with a cemented carbide tip is installed to prevent wear of the outer ring.

Japanese Patent No. 3250663

  However, in the conventional shield machine, in the super-long distance construction exceeding several km to 10 km, the hardened welding and the carbide tip are also worn, so that the measures for preventing the outer ring from being worn are insufficient.

  In recent years, high-strength walls have been excavated at the reach after the ultra-long-distance excavation, and many high-strength walls and hard ground have appeared in the excavation section. It has been demanded.

  Therefore, an object of the present invention is to provide a cutter device that extends the life of an outer peripheral ring in ultra-long distance construction.

  The present invention devised to achieve the above object is a cutter device that is provided at the front portion of a shield frame and that is driven to rotate and cuts the face, and the outer circumferential surface of the outer ring of the cutter device is arranged in the circumferential direction. A plurality of protection bits for preventing wear of the outer peripheral ring are provided at intervals, and the protruding height of each protection bit from the outer peripheral ring is different.

  An attachment groove for a protection bit having a different depth may be formed on the outer peripheral surface of the outer ring, and the protection bit having the same height may be provided in the attachment groove.

  The protection bit may be formed along an axial direction from the front end to the rear end of the outer peripheral ring.

  A plurality of ring cutter bits projecting toward the front end side of the outer peripheral ring with an interval in the circumferential direction may be provided on the outer peripheral surface of the outer peripheral ring, and the protection bit may be provided between the ring cutter bits.

  According to the present invention, it is possible to prolong the life of the outer peripheral ring in ultra-long distance construction.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic view of a shield machine using a cutter device showing a preferred embodiment of the present invention.

  As shown in FIG. 1, a cutter device 1 is provided at a front portion of a shield frame 2 of a shield machine 10 for digging a tunnel in the soil via a partition wall (not shown), and is rotated to cut a face by cutting the face. This is a spoke-type cutter device for excavating mountains.

  The cutter device 1 includes a plurality of spokes 3 extending radially outward from the center in the radial direction, and an outer peripheral ring having an inner peripheral surface supported by the spokes 3 and having an outer diameter substantially the same as the outer diameter of the shield frame 2. 4. A large number of cutter bits 5 for cutting the face are provided on the front surface of each spoke 3.

  In the cutter device 1, a plurality of protection bits 6 for preventing wear of the outer ring 4 are provided on the outer circumferential surface of the outer ring 4 at intervals in the circumferential direction. The projecting height from the outer peripheral surface toward the outside in the radial direction was varied.

  In the present embodiment, in order to earn a digging distance three times that in the case of using one protection bit 6, the protrusion height of each protection bit 6 from the outer peripheral ring 4 is differentiated in three stages. The protection bit 6 having the highest protrusion height is designated as the protection bit 6a, the protection bit 6 having the lowest protrusion height is designated as the protection bit 6c, and the protection bit 6 having an intermediate protrusion height is designated as the protection bit 6b.

  The protection bit 6 is formed along the axial direction from the front end to the rear end of the outer ring 4. That is, the protection bit 6 has the same length in the longitudinal direction as the axial length (thickness) of the outer peripheral ring 4.

  As shown in FIGS. 1 and 2, in the cutter device 1, the ring for projecting toward the front end side (face side) of the outer peripheral ring 4 at the front end portion of the outer peripheral surface of the outer peripheral ring 4 with a spacing in the circumferential direction. A plurality of cutter bits 7 are provided, and a protection bit 6 is provided between the ring cutter bits 7.

  The ring cutter bit 7 is a cutter bit for protecting the outermost peripheral portion of the cutter device 1 such as the outermost peripheral cutter bit 5 and the front end face of the outer peripheral ring 4. The ring cutter bit 7 has a tip portion 7t inclined toward the outer side in the radial direction of the outer peripheral ring 4, and the cutting edge cuts the face on the outer peripheral side of the outer peripheral ring 4.

  An attachment groove 27 for attaching the ring cutter bit 7 is formed in the front end portion of the outer peripheral surface of the outer ring 4 by machining according to the attachment interval of the ring cutter bit 7. Ring cutter bits 7 are provided respectively. The ring cutter bit 7 is attached to the bottom surface of the attachment groove 27 by welding 28, and hardened welding 29 is performed on the side surface portion of the ring cutter bit 7 as a measure against wear of the weld attachment portion.

  Here, the protection bits 6a to 6c will be described in more detail.

  As shown in FIG. 3, the three protection bits 6a to 6c are the same, and the height of the bit itself (bit height) is the same. Each of the protection bits 6a to 6c includes a cutting blade 61 having a wide root portion and a substantially convex shape in a cross-sectional view, and a cemented carbide attached to the top surface of the cutting blade 61 and both ends of the top portion. And a cemented carbide cutting blade 62.

  On the outer peripheral surface of the outer peripheral ring 4, there are formed protection bit mounting grooves (notch grooves) 36a to 36c having different depths according to the mounting intervals of the protection bits 6a to 6c by machining. Protection bits 6a to 6c are provided in the attachment grooves 36a to 36c for the protection bits, respectively. The depth of the mounting groove 36a is the shallowest, the depth of the mounting groove 36c is the deepest, and the depth of the mounting groove 36b is between these. Each of the protection bits 6a to 6c is attached to the outer ring 4 by welding 37 on the bottom surface of the protection bits mounting grooves 36a to 36c.

  Each of the protection bits 6a to 6c has a protruding height from the outer ring 4 that sequentially increases along the circumferential direction of the outer peripheral surface of the outer ring 4 (in FIG. 3, from the right to the left) or low (in FIG. 3). , Lower from left to right).

  In this embodiment, since the protruding heights of the protection bits 6a to 6c are different in three stages, when the protection bits 6c, 6b, and 6a are arranged so that the protruding heights are sequentially increased, the protection bits 6c, 6b, and 6a are arranged. 1 is a set in which the number of spokes 3 in FIG. 1 or a multiple of the number of spokes 3 is divisible by the number of protection bit stages (in this embodiment, the number of spokes is 6, so a multiple of 6 or 6 can be divided by 3). A number of protection bits 6 may be used.

  As an example, in this embodiment, the outer diameter φs of the shield machine (shield frame 2 in FIG. 1) is 12530 mm, the outer diameter φr of the outer ring 4 is 12510 mm, and the thickness d of the outer ring 4 is 90 mm. The projection height Hc of the protection bit 6c is 10 mm, the projection height Hb of the protection bit 6b is 20 mm, the projection height Ha of the protection bit 6a is 30 mm, and the projection height from the protection bit 6c to the protection bit 6a The height was increased by 10 mm. Further, each of the protection bits 6a to 6c was used having a width wb of the root portion of 90 mm, a width wt of the top portion of 67.5 mm, and a bit height hb of 52 mm. The outermost peripheral cutting outer diameter φM of the cutter device 1 is 12570 mm.

  The operation of this embodiment will be described.

  The shield machine 10 using the cutter device 1 is installed in the starting shaft and rotates the spokes 3 and the outer ring 4 of the cutter device 1 so that the cutter bit 5 and the ring cutter bit 7 are used to increase the strength. Drilling a face such as walls and earth and sand to form a wellhead, and then digging towards the reaching shaft.

  At this time, in the cutter apparatus 1, the protection bit (primary bit) 6 a having the highest protrusion height is first worn out by the flow of earth and sand after excavation. As the digging distance of the shield machine 10 becomes longer, when the protective bit 6a is worn out, the protective bit (secondary bit) 6b having an intermediate protruding height is worn, and when the protective bit 6b is worn out, the protruding portion The protection bit (third bit) 6c having the lowest height begins to wear.

  As described above, in the cutter device 1, the protection bits 6 a to 6 c in which the height difference arrangement is incorporated in the outer peripheral ring 4 are provided. In the cutter device 1, the protection bits 6 a to 6 c having different projecting heights from the outer ring 4 are provided on the outer circumferential surface of the outer ring 4 even when the shield machine 10 is dug in super-long distance construction exceeding several km to 10 km. It plays the role of the protection bit to protect sequentially.

  Thereby, according to the cutter apparatus 1, in super-long-distance construction, wear of the outer ring 4 due to the flow of earth and sand after excavation can be prevented, the life of the outer ring 4 can be extended, and the reliability of the outer ring 4 can be improved. Can do.

  Since the cutter device 1 is provided with the protection bits 6a to 6c having the same bit height in the attachment grooves 36a to 36c for the protection bits having different depths, the root portion can be prevented from being naturally worn by the flow of earth and sand, In addition, the cost of the cutter device 1 can be reduced by sharing the protection bits 6a to 6c.

  Moreover, since each protection bit 6a-6c is formed along the axial direction from the front end of the outer periphery ring 4 to the rear end, the cutter apparatus 1 can prevent the outer peripheral surface of the outer periphery ring 4 more effectively. .

  Furthermore, in the cutter apparatus 1, since the protective bits 6a to 6c are provided between the ring cutter bits 7, wear due to the flow of earth and sand at the weld 28 portion to which the ring cutter bits 7 are attached can be more effectively prevented. .

  In the above-described embodiment, the protection bits 6a to 6c having the same bit height are provided in the attachment grooves 36a to 36c for the protection bits having different depths. A protective bit may be provided.

  Further, the outer diameter of the outer peripheral ring may be slightly smaller than the outer diameter of the shield frame 2, and a protective bit having a different bit height may be provided on the outer peripheral surface of the outer peripheral ring having the smaller diameter.

  Moreover, although the protection bit 6 was demonstrated in the example formed along the axial direction from the front end of the outer periphery ring 4 to a rear end, it is the cutter apparatus 41 of the modification shown in FIG. 4 (a) and FIG.4 (b). As described above, three types of round-shaped sub protection bits 46a to 46c having different protrusion heights from the outer peripheral ring 4 may be used. Each of the sub protection bits 46a to 46c has a root portion formed in a columnar shape, and a cutting blade 42 formed in a substantially triangular shape in a cross-sectional view on the upper surface of the root portion.

  In the cutter device 41, a plurality of sub-protection bits 46a having the highest protrusion height are arranged on the outer peripheral surface of the outer peripheral ring 4 so as to be inclined with respect to the axial direction of the outer peripheral ring 4, thereby forming the protective bit 46A. A sub-protection bit 46b having an intermediate protruding height is provided so as to overlap each sub-protection bit 46a in the circumferential direction of the outer peripheral ring 4 with an interval in the circumferential direction of the outer peripheral ring 4 from the protective bit 46A. A plurality of protection bits 46B are arranged in the same manner as 46a. The protection bit 46C constituted by the sub protection bit 46c having the lowest protrusion height is also arranged in the same manner.

  That is, as the protection bit, three kinds of round-shaped sub protection bits 46 a to 46 c may be used which are staggered so as to wrap in the axial direction of the outer ring 4.

  In the above embodiment, the example of the cutter device with the outer peripheral ring has been described. However, in the cutter device without the outer peripheral ring, a protective bit may be provided on the spoke end surface portion.

  In the above-described embodiment, the example of the spoke-type cutter device has been described. However, a face plate-type cutter device may be used.

It is the schematic of the shield machine using the cutter apparatus which shows suitable embodiment of this invention. It is an enlarged side view of the cutter apparatus shown in FIG. It is the 3A-3A sectional view taken on the line of FIG. FIG. 4A is an enlarged side view of a cutter device showing a modification using a round-shaped sub-protection bit as a protection bit, and FIG. 4B is a view taken along the line 4B in FIG.

Explanation of symbols

1 Cutter device 2 Shield frame 4 Outer ring 6, 6a, 6b, 6c Protection bit 10 Shield machine

Claims (4)

  In the cutter device provided at the front part of the shield frame for cutting the face by rotating, in order to prevent the outer peripheral ring from being worn on the outer peripheral surface of the outer peripheral ring of the cutter device at an interval in the circumferential direction. A cutter apparatus, wherein a plurality of protective bits are provided, and the protruding height of each protective bit from the outer ring is different.   The cutter device according to claim 1, wherein a mounting groove for a protective bit having a different depth is formed on the outer peripheral surface of the outer peripheral ring, and a protective bit having the same height is provided in the mounting groove.   The cutter device according to claim 1 or 2, wherein the protection bit is formed along an axial direction from a front end to a rear end of the outer peripheral ring.   A plurality of ring cutter bits projecting toward the front end side of the outer peripheral ring with an interval in the circumferential direction provided on the outer peripheral surface of the outer peripheral ring, and the protection bit is provided between the ring cutter bits. The cutter apparatus in any one of 1-3.

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