JPH0150759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a rotary leaf feeder in a tunnel boring machine.

First, a conventional tunnel boring machine will be explained with reference to FIG.

This tunnel boring machine is provided with a bulk head 3 as a partition in the front opening of a shield hull 1, a cutter wheel 2 rotatably disposed, and an appropriate number of shield jacks 9 disposed within the shield hull 1. Then, the screw conveyor 5 is attached to the bulk head 3, and the screw conveyor 5 is
A rotary feeder 6 is attached to the shield hull 1 and the constructed segment 4 is equipped with a belt conveyor 7 as an earth and sand discharge device.

Next, its operation will be explained.

In tunnel construction, the reaction force is transmitted to the wall or ground of the starting shaft at the time of starting, and then to the segment 4 etc. built on the tunnel wall excavated by the tunnel excavating machine, and while rotating the cutter wheel 2. A tunnel is excavated by propelling the shield hull 1 by a shield jack 9. When the shield jack 9 reaches the stroke end, it stops propelling the shield hull 1, and the shield jack 9
After constructing segment 4 at a distance of one stroke, similar excavation is performed again.

By the way, when excavating a soft ground layer with a lot of spring water, the face and the inside of the tunnel should be separated by bulkhead 3.
The earth and sand excavated by the cutter wheel 2 is conveyed by the belt conveyor 7 via the screw conveyor 5 and the rotary feeder 6. In this case, the spring water is stopped by the compacted part of the earth and sand in the screw conveyor 5, and even if the spring water pressure is higher, the rotary leaf feeder 6 prevents the spring water from spouting, and the earth and sand are discharged. .

As shown in FIGS. 2 and 3, a conventional rotary feeder 6 used in such a tunnel excavation machine includes a casing 10, a rotor 11, a scraper 12, and a hydraulic motor 13 as a drive source.
and a power transmission means. The casing 10 consists of a cylindrical body 10A and lid plates 10B, 10B fixed to both openings of the body 10A,
The body portion 10A is provided with an earth and sand inlet 20 communicating with the earth and sand outlet 5A of the screw conveyor 5, and also provided with an earth and sand outlet 21 facing the end 7A of the belt conveyor 7 on the earth and sand inlet side. The rotor 1
1 is formed by planting an appropriate number of blades 11A, for example, 5 blades, at equal intervals and radially on a rotating shaft 11B,
The rotor 11 is rotatably housed in the casing 10 with both ends of the rotating shaft 11B being supported by bearings in the center of both cover plates 10B, 10B of the casing 10. The scraper 12 connects both ends of the scraping member 12A to the rotating shaft 12 via connecting members 12B, 12B.
C and 12C are connected in parallel with each other, and the rotation axes 12C and 12C are rotatable by bearings on both cover plates 10B and 10B on the earth and sand discharge port 21 side of the casing 10, and the rotation center axis 0 ' is parallel to the rotation center axis 0 of the rotor 11. The hydraulic motor 13 is connected to the screw conveyor 5.
It is attached to a frame 13A fixed to.
The power transmission means includes a gear 14 attached to the output shaft 13B of the hydraulic motor 13, a gear 15 attached to the intermediate shaft, a gear 16 attached to the rotating shaft 11B of the rotor 11, and a rotating shaft 12C of the scraper 12.
The hydraulic motor gear 14 and intermediate shaft gear 15 are meshed with each other, the intermediate shaft gear 15 is meshed with a rotor gear 16, and the rotor gear 16 is meshed with a scraper gear 17. be.

The rotary leaf feeder 6 for tunnel boring machines is
With the above configuration, the earth and sand discharged from the earth and sand discharge port 5A of the screw conveyor 5 is once taken in from the earth and sand intake port 20 into the casing 10 partitioned into five chambers by the blades 11A of the rotor 11. Due to the rotation of the rotor 11, the earth and sand discharge port 21 is
The earth and sand attached to the rotor 11 and the like are scraped out by the scraper 12 that rotates in conjunction with the rotor 11, and are discharged from the earth and sand outlet 21 to the belt conveyor 7. It is discharged out of the machine and out of the tunnel by the belt conveyor 7 or the like.

In the conventional rotary feeder mentioned above,
The length of the arm of the scraper 12 is set so that it can scrape out even the dirt attached to the center of the rotor 11.
That is, the scraping member 12A and the rotating shafts 12C, 12C
The length of the connecting members 12B, 12B that connect the scraper 12 is long, and the rotation center axis of the scraper 12 is located outside the rotation range of the blade 11A of the rotor 11 (outside the casing 10). For this reason, as shown in Fig. 2, while the part A (the dotted part in the drawing) is working effectively to scrape out the soil adhering to the rotor 11, etc., the part B is not working effectively (the grid in the drawing). There is a problem in that the portion ( ) is large. In order to solve this problem, it is conceivable to shorten the length of the connecting member of the scraper 12, but if this is done, the earth and sand attached to the center of the rotor 11 cannot be scraped out, and the earth and sand discharge efficiency decreases. There is a problem with doing so. Also,
It is conceivable to remove the scraper 12 and manually scrape out the dirt adhering to the rotor 11, etc., but doing so is extremely dangerous and difficult to scrape out. For this purpose, a rotary feeder with a large dead space is used, and for this reason, the belt conveyor 7
The space R between the lower surface of the end 7A on the earth and sand intake side and the inner surface of the segment 4 becomes smaller. For this purpose, the usual method of transporting the segments as shown in FIG.
1A and conveying the segment 4 to the erector part 8 along the guide 32 provided on the belt conveyor 7 using the rollers 31 becomes difficult, and as illustrated in FIG. A method is adopted in which the material is transported in a space to the side of the rotary feeder 6 and the belt conveyor 7. As a result, there is a possibility that the danger to workers, such as a falling accident of the segment 4 or a collision accident, may increase. In addition, for small diameter tunnel boring machines,
The belt conveyor 7 itself may become impossible to attach. In such a case, it may be possible to remove the scraper 12 and manually scrape out the earth and sand, but this is inconvenient and dangerous as described above.

Furthermore, since the length of the connecting member of the scraper 12 is long, the circumferential speed of the scraping member 12A at the tip is fast.
In addition, since it rotates while protruding beyond the casing 10, it is very dangerous during operation. Furthermore, if a boulder or the like is caught between the scraper 12 and the rotor 11, the impact load is large because the circumferential speed of the scraper 12 is fast, and there are other problems such as the need to make the scraper 12 solid. .

The present invention aims to provide a rotary feeder for a tunnel boring machine that improves the problems of the prior art as described above.

In order to achieve the above objects, the present invention has the following features:
A scraper is rotatably supported on the earth and sand discharge port side of the casing so that the central axis of rotation of the scraper is located within the rotation range of the blades of the rotor, and at that position, the scraper rotates and the scraping member is moved to the center of the rotor. The length of the connecting member is set so that the scraping member projects slightly outward from the rotation range of the rotor blades when the scraping member is located on the opposite side of the It is characterized in that the rotor blades are interlocked with each other so that they pass through the scraper when the rotor blades are out of the rotation range.

Hereinafter, one embodiment of the rotary leaf feeder in the tunnel boring machine of the present invention will be described with reference to FIGS. 6 to 8.

In the figure, the same reference numerals as in FIGS. 1 to 5 indicate the same parts.

Therefore, the rotary leaf feeder 6' for a tunnel excavating machine of the present invention in this embodiment has approximately fan-shaped notches 10C, 10C in the earth and sand discharge side portions of both cover plates 10B, 10B of the casing 10, and The arm member 10 is provided in the range of two pitches of the blade 11A, and the arm member 10 is
D, 10D protrude toward the notches 10C, 10C, and the rotation shafts 12C, 12C of the scraper 12 are rotatably supported on both arm members 10D, 10D by bearings, and the rotation center axis of the scraper 12
0'' is located within the rotation range of the blade 11A of the rotor 11, and when the scraper 12 rotates and the scraping member 12A is located on the opposite side of the center of the rotor 11, the scraping member 12A moves into the rotation range of the blade 11A of the rotor 11. Connecting member 1 so as to protrude slightly outward from the rotation range of
Set the length of 2B. In addition, a drive sprocket 18 is attached to the output shaft 13B of the hydraulic motor 13,
Driven sprocket 1 of rotating shaft 11B of rotor 11
9, and run the chain 25 around the driven sprocket 19 and the driving sprocket 18.
In addition, when the rotor gear 16 and the scraper gear 17 are engaged with each other, and the scraping member 12A of the scraper 12 is located outside the rotation range of the blade 11A of the rotor 11, the blade 11A of the rotor 11 engages with the scraper 12.
The rotor 11 and the scraper 12 are interlocked by the gears 16 and 17 so as to pass through.

Since the rotary feeder of the present invention has the above-described configuration, the earth and sand from the screw conveyor 5 is once taken into the casing 10, and then discharged from the earth and sand outlet 21 to the belt conveyor 7 by the rotation of the rotor 11. Earth and sand adhering to the rotor 11 and the like are scraped out by a scraper 12 and discharged from the earth and sand outlet 21 to the belt conveyor 7. At this time, when the rotation center axis 0'' of the scraper 12 is located within the rotation range of the blades 11A of the rotor 11, and when the scraping member 12A is located on the opposite side to the center of the rotor 11, the scraping member 12A Since the length of the connecting member 12B is set to slightly protrude outward from the rotation range of the blade 11A, the length of the connecting member 12B of the scraper 12 can be shortened, and the length of the connecting member 12B can be shortened. Even if the length is shortened, the interlocking rotation of the rotor and the scraper can scrape out the soil adhering to the center of the rotor 11. Therefore, the effective part A' can be made large, and the part A' of the debris space can be saved. As a result, the space R' between the lower surface of the end of the belt conveyor 7 on the dirt intake side and the inner surface of the segment 4 can be made larger compared to the conventional one. 4 can be carried in using a trolley instead of a horizontal suspension method, and the scraper 12 can be attached even in the case of a small-diameter tunnel boring machine.Furthermore, the length of the connecting member of the scraper 12 is short. As a result, the circumferential speed decreases, and as a result, the impact load when a boulder or the like gets caught is small.Also,
Since the amount of protrusion of the scraper 12 is small, the work can be performed safely.

As described above, in the rotary feeder in the tunnel boring machine of the present invention, the portion of the scraper that is effective in scraping out earth and sand can be increased, while the portion of the dirt space that is not effective can be reduced. Moreover, since the length of the connecting member of the scraper can be shortened, the circumferential speed of the scraper can be reduced and the work can be performed safely.

[Brief explanation of drawings]

Figure 1 is a sectional view of a tunnel boring machine equipped with a conventional rotary leaf feeder, Figure 2 is a sectional view of a conventional rotary leaf feeder, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a general Sectional view of the tunnel boring machine showing the segment loading device, No. 5
The figure is a cross-sectional view of a tunnel boring machine showing a loading device for horizontally suspending segments. Figures 6 to 8
The figures show an embodiment of a rotary leaf feeder in a tunnel excavating machine of the present invention, FIG. 6 is a sectional view of a tunnel excavating machine equipped with the rotary leaf feeder of the present invention, and FIG. The sectional view, FIG. 8, is a sectional view taken along the - line in FIG. 7. 1... Shield Hull, 2... Cutter Foil,
3... Bulkhead, 4... Segment, 5...
Screw conveyor, 6...Rotary feeder, 7...Belt conveyor, 8...Erector,
9...Shield jacket, 10...Casing,
10C...Notch, 11...Rotor, 11A...Blade, 11B...Rotating shaft, 12...Scraper, 1
2A... scraping member, 12B... connecting member, 12C
...Rotating shaft, 13...Hydraulic motor, 16, 17...
...Gear, 18, 19... Sprocket, 25...
Chain.

Claims (1)

[Claims] 1. A partition wall is provided in the front opening of the shield hull, a cutter wheel is rotatably arranged, an appropriate number of shield jacks are arranged in the shield hull, a screw conveyor is attached to the partition wall, and the screw conveyor is installed in the shield hull. A rotary feeder was attached to the Yukon Bear, and a sand discharge device was installed in the shield hull and constructed segments, and the cutter wheel was rotated while operating the shield jack to remove the ground at the face of the tunnel, which was separated from the inside of the tunnel by the bulkhead. In a tunnel excavating machine that excavates and discharges the excavated earth and sand to the outside of the tunnel by the screw conveyor, rotary leaf feeder, and earth and sand discharge device, the rotary leaf feeder has a cylindrical casing and a rotating shaft. The screw conveyor is constructed of a rotor in which an appropriate number of blades are installed radially at equal intervals, and a scraper in which a scraping member is connected to the rotary shaft via a connecting member, and the screw conveyor is attached to the casing. an earth and sand intake port that communicates with the earth and sand discharge port of the earth and sand discharge device, and an earth and sand discharge port that faces the earth and sand intake side end of the earth and sand discharge device, and the rotor is rotatably supported in the casing, and The scraper is rotatably supported on the earth and sand discharge port side of the casing so that the central axis of rotation of the scraper is located within the rotation range of the blades of the rotor, and the scraper rotates about the axis to remove the scraping member. The length of the connecting member is set so that the scraping member projects slightly outward from the rotation range of the rotor blades when located on the opposite side from the center of the rotor,
The connecting member is disposed outside the rotor in the width direction, and the scraper and the rotor are connected so that the blades of the rotor pass through the scraper when the scraping member of the scraper is outside the rotation range of the blades of the rotor. A rotary leaf feeder in a tunnel boring machine characterized in that the rotary leaf feeder is interlocked with each other.