JP3722526B2 - Tunnel excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel excavator, and more particularly to a tunnel excavator that takes excavation shear excavated by rotation of a cutter head into the apparatus via a shear intake port on the outer periphery of the cutter head and conveys the excavation shear to the rear side. It is.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a drilling method disclosed in Japanese Patent Publication No. 7-23676 is known as a method for excavating a tilt shaft used in a power generation facility. As shown in FIG. 5, the tunnel excavator 100 used in this conventional method forms a large diameter reaming hole 102 by performing a diameter expansion excavation along a small diameter pilot hole 101 excavated in advance. Is. In this case, excavation shear generated when the reaming hole 102 is expanded is dropped in the pilot hole 101 and discharged forward.
[0003]
[Problems to be solved by the invention]
However, according to the above-mentioned conventional construction method, it is necessary to excavate the pilot hole 101 in advance, so that it is necessary to perform excavation work twice, or a space for dropping and excavating excavation shear is provided in the lower front part of the inclined shaft. There was a problem that it was necessary to form in advance.
[0004]
In order to solve such problems, the present applicant has already proposed a tunnel excavator in which the excavation excavated by the cutter head is forcibly conveyed to the rear side after being taken into the apparatus. (Japanese Patent Application No. 7-180412). According to this prior application invention, it is possible to save time and labor for excavating a reaming hole for dropping and excavating excavation shears, and it is possible to efficiently perform down-cut excavation of an inclined shaft.
[0005]
However, in the prior invention, as shown in FIG. 6, since the face plate 103a of the cutter head 103 has a flat shape, the slide plate 104 for guiding excavation shear taken from the outer peripheral portion of the cutter head 103 is provided. As a result of the mounting angle being limited to the shape of the face plate 103a, the falling direction of the excavation shear (direction of arrow C) becomes a direction substantially perpendicular to the direction of gravity and the excavation shear stays in the vicinity of the shear intake. There is a problem that it cannot slide down smoothly.
[0007]
The present invention has been made in view of the above problems, the tunnel boring machine of swash anti drilling, can introduce the conveying means dropped sliding drilling shear taken in from shear inlet smoothly The object is to provide a tunnel excavator.
[0008]
[Means for solving the problems and actions / effects]
To achieve the foregoing purposes, the tunnel boring machine according to the present invention,
A tunnel excavator that rotates a cutter head to cut down an inclined pit, takes the excavation shear into the machine via a shear inlet provided on the outer periphery of the cutter head, and conveys it backward by a conveying means,
Excavation shear that is formed in a convex shape with the face plate center portion of the cutter head facing forward, the front end portion of the transport means extends to a position near the back surface of the face plate center portion, and is taken in from the shear intake port Is provided with a slide plate for guiding the guide toward the front end portion of the conveying means.
[0009]
In the present invention, the excavation shear excavated by the rotation of the cutter head is taken into the machine through the shear intake provided in the outer peripheral portion of the cutter head, and is guided toward the front end portion of the conveying means by the slide plate. Then, it is conveyed backward by this conveying means. In the present invention, the center portion of the face plate of the cutter head is formed in a convex shape toward the front, and the front end portion of the conveying means extends to a position near the back surface of the center portion of the face plate. The mounting angle of the slide plate to be guided, in other words, the direction in which the excavation shear falls can be brought closer to the direction of gravity, which prevents the excavation shear from staying in the vicinity of the shear intake and allows it to slide smoothly. It becomes.
[0010]
Oite the present invention, provided with a raking scrapers drilling shear the outer periphery of the cutter head, before Symbol cutter head front, preferably drilling shear provided scraper plate scrape the outer peripheral side of the cutter head .
[0011]
In such a configuration , the excavation excavated at the face of the cutter head is guided to the outer peripheral portion of the cutter head along the side surface of the scraping plate rotated in accordance with the rotation of the cutter head, The outer periphery is scraped up by a scraper and taken into the machine from a shear inlet. In this way, by providing the scraping plate, the excavation efficiency of the excavation shear until the excavation shear excavated in the face is taken into the shear intake in the space from the cutter head face plate to the face is improved. In addition, it is possible to improve the uptake capability of the excavation shear at this shear intake port.
[0012]
The outer peripheral edge of the front Symbol scraper plate is preferably relative to the shear inlet provided in the rotation direction front side of the cutter head. The inner peripheral end of the scraping plate is preferably provided on the front side in the rotational direction of the cutter head with respect to a line connecting the outer peripheral end of the scraping plate and the center of the cutter head. The shape connecting the inner peripheral end and the outer peripheral end of the scraping plate may be a curve or a straight line. By doing in this way, the excavation shear removal to the shear intake and the excavation shear at the shear intake become more reliable.
[0013]
Further, the height of the scraping plate is preferably lower by 20 to 50 mm than the cutting edge of the disk cutter provided on the front surface of the cutter head. By doing this, even if the disc cutter is worn, the tip of the scraper plate is located at a position separated by more than the allowable wear allowance (usually less than 20 mm) of the disc cutter. It is possible to prevent a collision. Moreover, if it is less than 50 mm, the early wear of the disc cutter can be prevented without lowering the scraping effect of excavation.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific examples of the tunnel excavator according to the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a longitudinal sectional view of a tunnel excavator according to a first embodiment of the present invention, and FIG. 2 is a front view of the tunnel excavator.
[0016]
The tunnel excavator 1 according to the present embodiment is used for excavating an inclined shaft for water conveyance in a power plant, for example. In this tunnel excavator 1, a cutter head 3 is rotatably supported via a cutter head support 2 at the front portion of the excavator body, and a large number of disc cutters 4 are provided on the front surface of a face plate 3a of the cutter head 3. It is installed. Further, the cutter head support 2 is provided with a side support 5 for supporting the cutter head support 2 with respect to the tunnel well wall at the end of excavation.
[0017]
A main gripper 6 is provided behind the cutter head support 2, and a lattice jack 7 is disposed between the cutter head support 2 and the main gripper 6. Thus, excavation is performed by transmitting a driving force to the cutter head support 2 by the lattice jack 7 and rotating the cutter head 3 while applying a reaction force to the tunnel pit wall by the main gripper 6. The excavation shear generated by this excavation is conveyed to the rear side in the machine by a screw conveyor 8 disposed in the center.
[0018]
The face plate 3a of the cutter head 3 is formed so that the center portion is convex toward the front, and a plurality of (six in this embodiment) slip-in openings 9 are arranged on the outer periphery of the face plate 3a. At the same time, a scraper 10 that scrapes the excavated shear is disposed behind the shear inlet 9 in the cutter head rotation direction (arrow R direction). A plurality of (six in this embodiment) scraping plates 11 are attached to the front surface of the face plate 3a to scrape the excavation shear toward the outer peripheral side of the face plate 3a.
[0019]
The scraping plate 11 is provided on the front side in the rotational direction (arrow R direction) of the cutter head 3 with respect to the shear inlet 9 at the outer peripheral end, and the outer peripheral end of the scraping plate 11 and the cutter head 3. It is provided on the front side of the cutter head 3 in the rotation direction (arrow R direction) with respect to the line connecting the center of the cutter head 3 and is curved toward the rotation direction of the cutter head 3 as a whole. Further, the height of the scraping plate 11 from the face plate 3a is made lower by 20 to 50 mm than the cutting edge of the disc cutter 4, so that even if the disc cutter 4 is worn, the scraping plate 11 becomes a face during excavation. It is designed to prevent collisions. Here, the allowable wear allowance of the disc cutter 4 is usually less than 20 mm.
[0020]
On the back surface side of the face plate 3a, the screw conveyor 8 is provided so that its front end extends to the position near the back surface of the center portion of the face plate 3a. In addition, on the back surface of the face plate 3a, in order to guide the excavation shear taken in from the shear intake port 9 toward the front end portion of the screw conveyor 8, the corresponding shear intake ports 9 correspond to the respective shear intake ports. A slide plate 13 is provided so as to be inclined from 9 to the upper end of a hopper 12 attached to the screw conveyor 8.
[0021]
In such a configuration, excavation shear excavated by the rotation of the cutter head 3 and staying in the portion A in FIG. 1 in particular is a side surface of the scraping plate 11 on the front side in the cutter head rotation direction as the cutter head 3 rotates. Is guided to the outer periphery of the cutter head 3 in the direction of the arrow S, and is scraped by the scraper 10 at the outer periphery and taken into the machine from the shear inlet 9. After that, the excavated ladle taken into the machine is guided by the slide plate 13 and transferred from the hopper 12 to the front end portion of the screw conveyor 8, and is conveyed rearward by the screw conveyor 8. A shutter 14 is provided below the rear end of the screw conveyor 8 to control the fall of the excavation shear. The opening excavation of the shutter 14 causes the excavation shear to be mounted on the belt conveyor 15 with a crosspiece below. And is further conveyed to the rear side by the belt conveyor 15 with a crosspiece.
[0022]
According to the present embodiment, the scraping plate 11 is provided on the face plate 3 a of the cutter head 3, so that the excavated shear excavated in the face can be forcibly discharged to the outer peripheral portion of the cutter head 3. It is possible to improve the soil removal performance of the excavated shear until it is taken into the shear intake port 9 and to improve the uptake capability of the excavated shear at the shear intake port 9. Further, the center portion of the face plate of the cutter head 3 is formed in a convex shape toward the front, and the front end portion of the screw conveyor 8 extends to a position near the back surface of the center portion of the face plate, so that excavation shear is guided. The mounting angle of the slide plate 13, in other words, the direction in which the excavation slip falls can be made closer to the direction of gravity, and the excavation slip can be dropped into the hopper 12 more smoothly than the conventional device with a steep slope.
[0023]
FIG. 3 shows a longitudinal sectional view of a tunnel excavator according to a second embodiment of the present invention, and FIG. 4 shows a front view of the tunnel excavator.
[0024]
In the tunnel excavator 20 of the second embodiment, the shape of the face plate 21a of the cutter head 21 is formed in a dome shape. Since the points other than this are basically not different from those of the first embodiment, the same reference numerals are given to the drawings, and detailed description thereof is omitted.
[0025]
Similar to the first embodiment, the shape of the face plate 21a may be a dome shape and the front end of the screw conveyor 8 may be extended to a position near the center of the back surface of the face plate 21a as in the present embodiment. There is an effect.
[0026]
In each of the above-described embodiments, the screw conveyor 8 and the belt conveyor 15 with a crosspiece are used in combination as the means for conveying the excavation rearward in the machine. However, as the conveying means, various modifications can be made as described below. Examples are possible.
(1) A method of sucking excavated shear through a conduit using the suction force of a vacuum pump.
(2) A system in which water is supplied through a water pipe into the cutter head chamber, and the excavated ladle is made into a slurry and sucked by a mud pump.
(3) A method of conveying only by a belt conveyor with a cross.
[0028]
In each of the above embodiments, the use of a lattice jack for propulsion has been described. However, a thrust jack arranged substantially in parallel with a conventional propulsion direction may be used.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a tunnel excavator according to a first embodiment.
FIG. 2 is a front view of the tunnel excavator according to the first embodiment.
FIG. 3 is a longitudinal sectional view of a tunnel excavator according to a second embodiment.
FIG. 4 is a front view of a tunnel excavator according to a second embodiment.
FIG. 5 is a longitudinal sectional view showing a conventional technique.
FIG. 6 is an explanatory diagram of a tunnel excavator according to the invention of the prior application.
[Explanation of symbols]
1,20 Tunnel excavator 3,21 Cutter head 3a, 21a Face plate 4 Disc cutter 8 Screw conveyor (conveying means)
9 Slip-in port 10 Scraper 11 Scraping plate 13 Slide plate 15 Belt conveyor

Claims (5)

A tunnel excavator that rotates a cutter head to cut down a tilt shaft and takes a drilling shear into a machine through a shear inlet provided on an outer peripheral portion of the cutter head and conveys it backward by a conveying means,
The excavation shear that is formed in a convex shape with the face plate center portion of the cutter head facing forward, the front end portion of the conveying means extends to a position near the back surface of the face plate center portion, and is taken in from the shear intake port A tunnel excavator, characterized in that a slide plate is provided for guiding the guide toward the front end portion of the conveying means. Provided with raking the scraper digging shear the outer periphery of the cutter head, before Symbol cutter head front, drilling shear to claim 1, characterized by providing a scraper plate scrape the outer peripheral side of the cutter head The tunnel excavator described .   3. The tunnel excavator according to claim 2, wherein an outer peripheral end of the scraping plate is provided on a front side in a rotation direction of the cutter head with respect to the shear intake port.   The inner peripheral end of the scraping plate is provided on the front side in the rotational direction of the cutter head with respect to a line connecting the outer peripheral end of the scraping plate and the center of the cutter head. Tunnel excavator.   The tunnel excavator according to any one of claims 2 to 4, wherein a height of the scraping plate is lowered by 20 to 50 mm from a cutting edge of a disk cutter provided in front of the cutter head.

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