JP3530617B2 - Tunnel 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 tunnel excavator, and more particularly to a tunnel excavator for expanding a previously excavated pilot pit to a reaming pit.

[0002]

2. Description of the Related Art Conventionally, an inclined shaft for sucking and flowing down water to a high place for effective use of nighttime electric power of a nuclear power plant,
A tunnel excavator is used for excavating a cable laying tunnel, etc., but in the case of a large diameter tunnel, a pilot pit with a small diameter should be excavated beforehand, and then the diameter of the tunnel should be increased (reaming). ) Is done. As this tunnel excavator for reaming, the one disclosed in Japanese Patent Laid-Open No. 5-187191 is known. FIG. 4 shows a tunnel excavator 100 for an inclined shaft disclosed in that publication. The tunnel excavator 100 takes a supporting force on an inner wall of a pilot pit 101 with a first gripper 102 and a reaming pit 103. The pilot pit 101 is expanded in diameter by rotating the cutter head 105 having a circular cross section while the second gripper 104 is supporting the inner wall of the. The excavation shear generated by excavating the face by the cutter head 105 falls in the pilot pit 101 due to gravity.

[0003]

However, when the excavation shear generated by excavation by the cutter head 105 comes close to the central portion of the cutter head 105, as shown in FIG.
There is a problem that the excavation shear is concentrated on the front surface on the inner peripheral side of the cutter head 105, which is indicated by a medium code 106, and the excavation shear is clogged. In addition, the first gripper 1
The protective plate 107 is provided to protect the No. 02 from excavation shear, but there is also a problem that the excavated shear is deposited on the protective plate 107.

A tunnel excavator for expanding the diameter of the pilot shaft as described above is also disclosed in Japanese Patent Laid-Open No. 6-42285. As shown in FIG. 5, the cutter head 110 of the tunnel excavator disclosed in this publication has a fan-shaped face plate 111 on which a plurality of disk cutters 112 are arranged over substantially the entire surface. 112
The bladed scraper 113 scrapes and collects the excavated skids obtained by excavating the cutting face by the rotation and the revolution of the cutter (the cutter head 110 rotates in the direction of the arrow). However, the existence of the disc cutter 112 for excavating the face itself hinders the flow of the excavation shear on the surface of the face plate 111, and the excavation shear generated by the excavation is efficiently collected and does not flow down to the pilot pit. .

The present invention has been made in view of the above-mentioned problems, and provides a tunnel excavator capable of efficiently performing diameter-expanding excavation without stagnation of excavation shear that occurs when the pilot hole is expanded. It is intended to be provided.

[0006]

In order to achieve the above-mentioned object, a tunnel excavator according to the present invention is, firstly, a tunnel for excavating a pre-excavated pilot pit to a reaming pit. In the excavator, the cutter head is provided with a plurality of blade-shaped scrapers radially collecting the excavation shear, and a chamfered portion is provided on the inner peripheral side of the cutter head in the rotation direction side of the cutter head. It is characterized by.

According to the tunnel excavator of the present invention having the first feature, even if excavation scrapes are collected by the blade-shaped scraper and concentrated on the inner peripheral side of the cutter head, the inner peripheral side of the cutter head is chamfered. Since the portion is provided, the overcrowded excavation shear does not pass through the chamfered portion and the front of the cutter head is not clogged with the excavation shear.

Secondly, the tunnel excavator according to the present invention comprises:
In a tunnel excavator that expands a pre-excavated pilot pit to a reaming pit, a cutter head has a plurality of digging shear discharge grooves arranged radially, and the depth of these digging shear discharge grooves is the outer peripheral side of the cutter head. It is characterized in that it gradually deepens as it approaches the inner circumference side.

According to the tunnel excavator of the present invention having the second feature, when the excavation shear gathers in the center of the cutter head through the excavation shear discharge groove, the inner circumferential side of the cutter head is better. The deeper the groove, in other words, the larger the discharge capacity of the excavation shear on the inner peripheral side, the clogging of the excavation shear is prevented.

Thirdly, the tunnel excavator according to the present invention comprises:
In a tunnel excavator for expanding the diameter of a pre-excavated pilot pit to a reaming pit, a cutter head is provided with a plurality of excavation discharge grooves radially and a plurality of disk cutters for digging the ground. It is characterized in that the disposition density of the disk cutters is reduced in a region near the cutter head rotation direction side with respect to the excavated shear discharge groove.

According to the tunnel excavator of the present invention having the third feature, the excavation shear generated by excavation by the disk cutter passes through the front surface of the cutter head and enters the excavation shear discharge groove, but the excavation shear discharge is performed. Since there are not many disc cutters in the area on the side of the cutter head in the direction of rotation with respect to the groove, the excavation shear will smoothly enter the excavation shear discharge groove without being obstructed by the disc cutter, resulting in clogging of the excavation shear. do not do.

Fourthly, the tunnel excavator of the present invention is a tunnel excavator for expanding a pre-excavated pilot pit to a reaming pit and digging it while dropping a digging shear into the pilot pit. A tip gripper device is provided at the tip of the main beam that extends along, and a protection plate is provided to protect the tip gripper device from the excavation slip that falls on the back of the tip gripper device. It is characterized in that a distribution protrusion having a ridge line along the radial direction centering on the main beam is provided on the upper part of the plate.

According to the tunnel excavator of the present invention having the fourth feature, when the diameter of the inclined shaft is increased, the excavation shear that falls into the pilot inclined shaft collides with the distribution protrusion provided on the protective plate to the ridgeline. As the excavation shear does not accumulate on the protection plate, it will fall further down the pilot inclined shaft.

Objects of the present invention will become apparent from the detailed description given below. However, while the detailed description and specific examples describe the most preferred embodiments, various changes and modifications within the spirit and scope of the invention will be apparent to those skilled in the art from the detailed description, and It will be described as an example.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the tunnel excavator according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an inclined shaft tunnel excavator 1 according to an embodiment of the present invention. This lean tunnel excavator 1 is provided with a nose gripper 5 at the tip of a main beam 4 extending along the respective walls of a pilot mine 2 which is a lean mine and a reaming mine 3 whose diameter has been expanded. Main beam 4 behind (reaming pit 3 side)
A main frame 6 is provided so as to be slidable back and forth, and a conical cutter head 7 is provided on the front side of the main frame 6. A main gripper 9 is attached to the main frame 6 via a jack 8.

In the reaming by the oblique tunnel excavator 1, the tip of the main beam 4 is supported by the nose gripper 5 against the pit wall of the pilot pit 2 and the main frame 6 is moved to the reaming pit 3 by the main gripper 9. It is performed by rotating the cutter head 7 in a state of being supported with respect to it. The excavation shear caused by this reaming drops in the pilot pit 2. In order to protect the nose gripper 5 from this falling excavation slide, an annular protective plate 10 is provided on the back of the nose gripper 5.
Is provided. The upper part of this protective plate (in FIG. 1 (a),
(Enclosed by a circle) is provided with a distribution protrusion 11 as shown in FIG. This distribution projection 11 has a pseudo-triangular pyramid shape having a ridgeline 11 'along the radial direction centering on the main beam 4 so that the falling excavation shear can be distributed to the left and right in FIG. 1 (b). Is. Due to the presence of such distribution protrusions 11, falling excavation waste is prevented from adhering to and depositing on the protective plate 10.

An enlarged sectional view of the cutter head 7 of the oblique tunnel excavator 1 is shown in FIG. 2 and a front view thereof is shown in FIG. In this way, the cutter head 7 is provided with the plurality of disk cutters 12. The disk cutter 12 rotates and revolves by the rotation of the cutter head 7, whereby the ground is excavated (diameter expansion). A plurality of blade-shaped scrapers 13 are provided upright in a radial manner in order to collect excavation shear generated by excavation at the center of the cutter head 7 communicating with the pilot pit 2.
The excavation shearing discharge grooves 14 are radially provided adjacent to the rotation direction side. A plurality of rectangular plates are continuously provided on the bottom surface of the excavation shearing discharge groove 14.

The excavation scrap collected by these scrapers 13 and entering the excavation shear discharge groove 14 moves to the central portion of the cutter head 7 through the excavation shear discharge groove 14 and falls into the pilot pit 2. However, since the outer peripheral portion of the cutter head 7 is naturally larger in area than the inner peripheral portion thereof, the excavated scrap scraped up is likely to be clogged between the cutter head 7 and the excavated surface due to overcrowding in the inner peripheral portion. Therefore, the cutter head 7 according to the present embodiment is shown in FIG.
As shown in FIG. 3, the depth of the excavated shearing discharge groove 14 gradually increases from the outer peripheral side to the inner peripheral side of the cutter head 7, and the excavated shearing discharge capacity increases. Further, a chamfered portion 15 is provided on the inner peripheral side of the cutter head 7 on the rotation direction side of the cutter head 7 with respect to the scraper 13.

Further, as shown in FIG. 3, the disc cutter 12 for excavating the ground has the excavation shearing discharge groove 14
Is not provided in the vicinity of the rotation direction side.
This disk cutter 12 excavates the ground, but its existence itself hinders the flow of excavation generated by excavation on the surface of the cutter head 7. As described above, by disposing the disk cutters 12 with a biased density, the excavation shear is efficiently captured in the excavation shear discharge groove 14.

As in this embodiment, the groove depth of the excavated shearing discharge groove 14 is inclined, the chamfered portion 15 is provided on the inner peripheral side of the cutter head 7, and the disc cutter 12 is provided.
All of the above are not limited to the inclined shaft tunnel excavator, but are also applied to the horizontal shaft tunnel excavator. In these cases, since the excavated shear does not drop into the pilot pit, it can be carried out by a belt conveyor provided on the inner peripheral side of the cutter head, for example.

As mentioned above, it is obvious that the present invention can be variously modified. Such modifications are within the spirit and scope of the invention, and all such variations and modifications apparent to those skilled in the art are intended to be within the scope of the following claims.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tunnel excavator of this embodiment.

FIG. 2 is an enlarged cross-sectional view of a cutter head according to this embodiment.

FIG. 3 is a front view of a cutter head according to this embodiment.

FIG. 4 is a cross-sectional view of a tunnel excavator according to a conventional example.

FIG. 5 is a front view of a cutter head according to a conventional example.

[Explanation of symbols]

1 tunnel excavator 2 pilot pits 3 reaming mines 4 main beam 5 nose gripper 6 main frames 7 cutter head 10 Protective plate 11 distribution protrusion 12 disk cutter 13 scrapers 14 Excavation slide discharge groove 15 Chamfer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yujiro Shibukawa 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura-gumi Co., Ltd. (72) Tsutomu Mizobata 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka Stocks Company Okumura Gumi (72) Inventor Shinichi Terada 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka Factory (72) Inventor Minami Yoshino 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka Plant (72) Inventor Toshihiro Yamazaki 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka factory (56) Reference JP-A-6-42285 (JP, A) JP-A-63-67397 (JP, A) JP 59-122699 (JP, A) JP 5-187191 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/10 E21D 9/00 E21D 9 / 06 E21D 9/087

Claims (4)

(57) [Claims] 1. A tunnel excavator for expanding a pre-excavated pilot pit into a reaming pit, in which a plurality of blade-shaped scrapers for scraping excavation shears are radially arranged in the cutter head, and A tunnel excavator characterized in that a chamfered portion is provided on the circumferential side of the scraper on the rotational direction side of the cutter head. 2. A tunnel excavator for expanding the diameter of a pre-excavated pilot pit into a reaming pit, wherein a plurality of digging shear discharge grooves are radially arranged on a cutter head, and the depths of these digging shear discharge grooves are different from each other. A tunnel excavator characterized in that it gradually deepens from the outer peripheral side of the cutter head toward the inner peripheral side. 3. A tunnel excavator for expanding the diameter of a pre-excavated pilot pit into a reaming pit, wherein a cutter head is provided with a plurality of excavation shear discharge grooves radially and a plurality of disc cutters for excavating the ground. Done,
A tunnel excavator characterized in that the disposition density of these disk cutters is made smaller in a region near a direction of rotation of a cutter head with respect to the excavation shearing groove. 4. A tunnel excavator for expanding a pre-excavated pilot pit into a reaming pit and dropping the digging shear into the pilot pit, in a main beam extending along a pit wall. A tip gripper device is provided at the tip, and a protection plate is provided to protect the tip gripper device from the digging slip that falls on the back of the tip gripper device, and the main beam is centered above the protection plate. A tunnel excavator, characterized in that a distribution protrusion having a ridge line along a radial direction is provided.