JPH0150760B2 - - 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. A rotary feeder 6 is attached to the bulkhead 3, and a belt conveyor 7 as an earth and sand discharge device is installed in the shield hull 1 and the constructed segment 4.

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 segments 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, the propulsion of the shield hull 1 is stopped, a segment 4 is constructed at a distance of one stroke of the shield jack 9, and then 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 are conveyed by the belt conveyor 7 via the rotary feeder 6. In this case, the spring water is prevented from spouting by the rotary leaf feeder 6, and the earth and sand are discharged.

A conventional rotary feeder 6' used in such a tunnel boring machine includes a casing 10, a rotor 11, a scraper 12, as shown in FIG.
It includes a hydraulic motor 13 as a drive source and power transmission means (not shown). The casing 10 is composed of a cylindrical body 10A and lid plates 10B, 10B provided at both ends of the body 10A. The earth and sand discharge port 21 is provided to face the end of the belt conveyor 7 on the earth and sand intake side. The rotor 11 has an appropriate number of blades 11A, for example, five blades, mounted on a rotating shaft 11B at equal intervals and radially, and both ends of the rotating shaft 11B are placed in the center of both cover plates 10B, 10B of the casing 10. A rotor 11 supported by a bearing is rotatably housed in a casing 10. The scraper 12 is
A scraping member 12A is connected to the rotating shaft 12C via a connecting member 12B in parallel with the rotating shaft, and the rotating shaft 12C is supported by bearings on both cover plates 10B, 10B on the earth and sand discharge port 21 side of the casing 10. Rotatably supported on the shaft. The rotor 11 and scraper 12 are driven by a hydraulic motor 13 via a power transmission means, and the earth and sand excavated by the cutter wheel 2 are discharged onto the belt conveyor 7 by the rotor 11 and the scraper 12, and the belt conveyor 7 carries the earth and sand out of the machine. , and is configured to be discharged outside the tunnel.

In the above-mentioned conventional rotary feeder 6', the length of the arm of the scraper 12, that is, the scraping member 12A and the rotating shaft 12C are connected to each other in order to scrape off even the dirt attached to the center of the rotor 11. The connecting member 12B is configured to have a long length, and the central axis of rotation of the scraper 12 (the central axis of the rotating shaft 12C) is located outside the rotation range of the blades 11A of the rotor 11 (outside the casing 10). It is. Therefore, the scraper 12
The earth and sand outlet 21 is opened wide so as not to hit the edge of the earth and sand outlet 21. Therefore, there is a problem that the earth and sand intake port 20 becomes small and the earth and sand discharge efficiency decreases. That is, in the rotary feeder 6', in order to discharge the earth and sand in a sealed manner, a casing wall (the body 10A and both cover plates 10B, 10B) corresponding to at least one pitch of the blade 11A of the rotor 11 is placed on both sides of the earth and sand discharge port 21. ) is absolutely necessary. As a result, the larger the earth and sand discharge port 21, the smaller the earth and sand intake port 20 becomes.
Although the rate of discharge of earth and sand by the scraper 12 is good, the rate of taking in earth and sand from the earth and sand intake port 20 is poor, and the overall earth and sand discharge efficiency decreases.

In addition, in contrast to the part A (the dotted part in the drawing) that works effectively to scrape off the dirt that has adhered to the rotor 11, etc., there is a large part B (the grid part in the drawing) that does not work effectively. It also has problems. Moreover, since the length of the connecting member 12B of the scraper 12 is long, the circumferential speed of the scraping member 12A at the tip is high and the scraping member 12A rotates protruding from the casing 10 to a large extent, which is very dangerous during operation. Also,
When 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 high, and there are also 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:
In a tunnel excavator equipped with a rotary leaf feeder on the bulkhead, 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 rotor blades, and The length of the connecting member is set so that when the scraper rotates around , and the scraping member is positioned on the opposite side from the center of the rotor, the scraping member protrudes slightly outward from the rotation range of the rotor blades. , and the scraper and rotor are interlocked with each other 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.

Hereinafter, one embodiment of the rotary leaf feeder in the tunnel boring machine of the present invention will be described with reference to FIGS. 2 to 4.

In the figure, the same reference numerals as in FIG. 1 indicate the same parts.

Therefore, in the rotary feeder of the present invention in this embodiment, a through hole is opened in the center of the bulkhead 3, and the mounting plate 10C of the casing 10 is attached to the periphery of the through hole. It is installed so that it is located below the central axis O' of the shield hull 1 and so that the central axis 11B of the rotor 11 is located along the bulkhead 3 in the radial direction of the shield hull 1. A notch is made in the body 10A of the casing 10 by 2 pitches, which is the difference of 3 pitches from the total pitch of the blades 11A of the rotor 11, and both cover plates 10
Two pitches of fan-shaped notches are opened in B and 10B in the same way as the above-mentioned notches, to form earth and sand intake ports 20 that open on the face side separated by the bulkhead 3. On the other hand, a cutout corresponding to one pitch of the blade 11A of the rotor 11 is opened in the body 10A of the casing 10, and a fan-shaped notch corresponding to one pitch is opened in both cover plates 10B, 10B in the same way as the above-mentioned notch. An earth and sand discharge port 21 is formed opposite to the earth and sand intake side end of the earth and sand intake side. An arm 10D is provided on the earth and sand discharge port 21 side of one (upper) cover plate 10B of the casing 10.
A rotary shaft 12C of the scraper 12 is rotatably supported on the arm 10D by a bearing, and the rotational center axis 0'' of the scraper 12 (the central axis of the rotary shaft 12C of the scraper 12) is connected to the blade 11 of the rotor 11.
A, 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 is located slightly outside the rotation range of the blade 11A of the rotor 11. The length of the connecting member 12B is set so that it protrudes. Further, a gear 16 is attached to the rotating shaft 11B of the rotor 11, and a gear 17 is also attached to the rotating shaft 11C of the scraper 12, and the rotor gear 16 and scraper gear 17 are meshed to interlock the rotor 11 and the scraper 12. Further, a drive sprocket (not shown) is attached to the output shaft of the hydraulic motor 13, and a driven sprocket 19 is attached to the rotating shaft 11B of the rotor 11, and a chain (not shown) is connected between the drive sprocket and the driven sprocket 19. When 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
rotor 11 and scraper 12 so as to pass through
and are interlocked via the gear.

Since the rotary feeder of the present invention has the above-described configuration, the earth and sand excavated by the cutter foil 2 are transported from the earth and sand intake port 20 to the casing 10.
Then, as the rotor 11 rotates, the earth and sand are discharged from the earth and sand outlet 21 to the belt conveyor 7, and the earth and sand adhering to the rotor 11 and the like are scraped off by the scraper 12, and the earth and sand is 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 blade 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 so as to protrude slightly outward from the rotation range of the blade 11A, the length of the connecting member of the scraper 12 can be shortened. Therefore, the soil intake port 20 can be made larger, and as a result, the soil intake rate from the soil intake port 20 is improved, and this is combined with the good discharge efficiency of the soil and sand by the scraper 12. The overall sediment discharge efficiency can be improved.

Furthermore, even if the length of the connecting member of the scraper 12 is shortened, the interlocking rotation of the rotor and the scraper can scrape off dirt and sand attached to the center of the rotor 11, so the effective portion I' can be made larger. At the same time, the partial width of the dead space can be reduced. Furthermore, since the length of the arm (connection member) of the scraper 12 is shortened, the circumferential speed is reduced and the impact load when biting into a boulder or the like is small. Further, since the amount of protrusion of the scraper 12 is small, the work can be performed completely.

As described above, the rotary leaf feeder in the tunnel excavation machine of the present invention can shorten the length of the scraper arm (connection member) in the tunnel excavation machine in which the rotary leaf feeder is attached to the bulkhead. In addition to making the earth and sand discharge port smaller, the earth and sand intake port can be enlarged accordingly, which improves the rate of earth and sand taken in from the earth and sand intake, and in combination with the earth and sand discharge efficiency of the scraper, the overall can improve the efficiency of sediment discharge. Also, the effective area can be made larger while the dead space can be made smaller. Furthermore, the circumferential speed of the scraper can be reduced and the work can be carried out safely.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a rotary feeder in a conventional tunnel boring machine. 2 to 4 show an embodiment of the rotary leaf feeder in the tunnel boring machine of the present invention, FIG. 2 is a sectional view of the tunnel boring machine equipped with the rotary leaf feeder, and FIG.
The figure is a cross-sectional view of the rotary feeder, Figure 4A,
B and C are cross-sectional views taken along line A-A in Figure 3, and B-B.
They are a line sectional view and a CC line sectional view. 1... Shield Hull, 2... Cutter Foil,
3... Bulkhead, 4... Segment, 6...
Rotary feeder, 7... Belt conveyor, 9
...Shield jacket, 10...Casing, 1
0A...body, 10B...cover plate, 11...rotor, 11A...blade, 11B...rotating shaft, 12...
...Scraper, 12A...Scraping member, 12B...
Connection member, 12C... Rotating shaft, 13... Hydraulic motor, 16, 17... Gear, 19... Sprocket.

Claims (1)

[Scope of 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, and a rotary leaf is provided in the partition wall. Equipped with an IDA, equipped with an earth and sand discharge device in the shield hull or the constructed segment, and while operating the shield jack, the cutter wheel is rotated to excavate the ground at the face section, which is separated from the inside of the tunnel by the bulkhead; In a tunnel excavating machine that discharges the excavated earth and sand out of the tunnel by the rotary leaf feeder and the earth and sand discharge device, the rotary leaf feeder is comprised of a casing having a cylindrical body with cover plates provided at both ends, and a rotating shaft. The rotor has a suitable number of blades planted at equal intervals and radially, and a scraper has a scraping member connected to the rotating shaft via a connecting member, and the scraper is configured to take in earth and sand into the casing. A mouth is provided to open on the face portion side separated by the partition wall, and a sand discharge port is provided facing the end of the sand intake side of the sand discharge device,
The rotor is rotatably supported within the casing, and the scraper is rotatably supported on the earth and sand discharge port side of the casing such that the central axis of rotation of the scraper is located within the rotation range of the blades of the rotor; The length of the connecting member is set so that when the scraper rotates around its axis and the scraping member is located on the opposite side from the center of the rotor, the scraping member protrudes slightly outward from the rotation range of the rotor blades. and the connecting member is disposed on the outside of the rotor in the width direction, and the scraper and the rotor are connected so that when the scraping member of the scraper is outside the rotation range of the rotor blade, the rotor blade touches the scraper. A rotary feeder in a tunnel boring machine, characterized in that the rotary feeders are interlocked with each other so as to pass through the tunnel. 2 The earth and sand inlet of the casing is provided in the body of the casing and both cover plates for a pitch equal to the difference of 3 pitches from the total pitch of the rotor blades, while the earth and sand discharge outlet is provided in the body of the casing and both cover plates of the rotor. A rotary leaf feeder in a tunnel boring machine according to claim 1, characterized in that the rotary leaf feeder is provided for one pitch of the blade.