JPS583917Y2 - tunnel boring machine - Google Patents

Description

[Detailed description of the invention] The present invention has an excavating tool and an excavating soil chamber at the front end of the cylindrical shield body, mixes additives such as bentonite solution with the soil excavated by the excavating tool, and excavates with the mixed soil. This invention relates to a tunnel boring machine that prevents the collapse of the surface and facilitates soil removal.

An excavation tool and an excavation soil chamber are installed at the front end of the cylindrical shield body, and additives such as bentonite solution are mixed into the soil excavated by the excavation tool, and the mixed mud is used to prevent collapse of the excavated surface and remove the soil. Tunnel boring machines designed to facilitate processing are known.

However, conventional tunnel excavators of this type have an additive inlet in the bulkhead of the excavated soil chamber to supply additives to the excavated soil chamber, so the additives are evenly mixed into the excavated soil. This is extremely difficult, and in order to convert the excavated soil into a soil that is highly effective in stopping water and preventing collapse of the face in the excavated soil chamber, the injection pressure must be extremely high even when the excavation machine is stopped, and a large amount of additives must be used. need to be press-fitted.

In addition, as shown in FIG. 7, a plurality of stirring blades 29 are attached to the excavated soil chamber 8 side of the cutter desk 28, and additives are injected from the bulkhead 7 (the injection port is not shown). Some machines rotate the stirring blades 29 at the same time as the cutter disk to ensure good mixing of excavated soil and additives.

In the figure, 1 is a cylindrical shield body, 4 and 5 are gears, 6 is a drive device, 30 is a cutter drive shaft, 31 is a bearing, and 15 is a shear removal device.

However, in this device, since the stirring blade 29 is driven at the same time as the cutter is driven, the resistance of the stirring blade becomes large.
There is a drawback that the driving torque of the cutter device increases significantly.

In order to improve the above-mentioned points, the present invention injects an additive while the excavated soil is being taken into the excavated soil chamber to mix the inflowing soil and the additive, and thus the excavated soil mixed with the additive is It is configured so that the excavated soil is taken into the excavated soil chamber, thereby equalizing the mixing of the excavated soil and the additive, and
The power required for mixing is reduced, the earth and sand resistance due to the additive is reduced, and the driving torque of the cutter device can be reduced.

An example of its implementation will be described below with reference to FIGS. 1 to 6.

Fig. 1 is a vertical sectional side view of the main parts of a tunnel boring machine equipped with the device of the present invention, Fig. 2 is a front view taken along line c-c in Fig. 1,
FIG. 3 is an enlarged sectional view taken along line a-a of FIG. 2.

In these figures, 1 is a cylindrical shield body, 2 is a cutter body rotatably equipped at its front end via a bearing 3, and has an excavator frame 2' with a cutter bit provided on the face side. As shown, the cutter body includes a large gear 4,
It is rotationally driven by a cutter drive device 6 via a small gear 5.

Reference numeral 7 denotes a bulkhead for forming an excavation soil chamber 8 between the excavator frame 2', 9 an additive inflow pipe attached to the center of the bulkhead via a support 10, and the outer end thereof is connected to a rotary joint 11.
It is connected to the additive injection pipe 12 via.

13 is an earth and sand packet, 14 is an earth and sand hopper, 15 is a waste removal device, and 16, 17, and 18 are earth and sand seals.

In the present invention, the additive inflow pipe 9 is connected to a hollow cutter center 19 located at the center of the excavator frame 2' through the bulkhead 7 and the excavation earth chamber 8,
A desired number of inflow channels 20 are opened on the outer periphery of the cutter center, and the inflow channels 20 are communicated with the hollow chamber of the bit frame 22 in which the cutter bits 21 are arranged, so that the additives that have entered the bit frame 22 are , an additive injection hole 23 provided facing the soil intake port 25 on the side surface of the bit frame 22, an additive injection hole 24 provided on the outer periphery of the excavator frame 2', and an additive injection hole 24 provided on the outer periphery of the excavator frame 2'; The additive is injected from an additive injection hole 32 provided on the face side, an additive injection hole 33 provided radially in the cutter center 19, and the like.

That is, in the present invention, an additive spout is provided at a desired position of the excavator frame during the inflow of excavated soil before the excavated soil flows into the excavated soil chamber from the face surface in contact with the excavator frame.

26 is a face, and 27 is excavated earth and sand. Figures 4 and 5
This figure shows a modification of the embodiment shown in FIGS. 1 to 3. The only difference is that the earth and sand intake ports 25 are arranged on both sides of the bit frame 22, and the other configurations are the same as in FIG. 2. This is similar to the embodiment shown in FIG.

FIG. 6 shows still another modification, in which sediment intake ports 25 are arranged on both sides of the bit frame 22, and additive inflow pipes 28 are installed outside of each sediment intake port. This shows an example in which the additive injection ports 23 are arranged so as to sandwich the bit frame.

Since the tunnel excavation machine of the present invention has the above-described configuration, when the additive is injected from the additive injection pipe 12, the additive is transferred to the rotary joint 11. The cutter body 2 passes through the additive inflow pipe 9.
The additive is fed into the center of the cutting tool frame 2' at the tip of the drilling tool frame 2', and from there flows into the bit frame 22 in which the cutter bits 21 are arranged through the inlet channel 20. Additive injection hole 23 provided in the cutter center 19, injection hole 24 provided on the outer periphery of the excavator frame 2', additive injection hole 32 provided in the front of the excavator frame 2', additive injection hole 23 provided in the cutter center 19. The agent is injected from the agent injection hole 33 or the like.

In this way, in the present invention, instead of supplying additives to the excavated soil chamber as in the past, the additives are supplied to the excavated soil before it flows into the excavated soil chamber from the face surface in contact with the excavation tool frame. is injected, so Figures 3 and 5
As shown in Fig. 6, the additive is already mixed with the excavated earth and sand when it flows into the intake port 25 from the face 26, and is added to the excavated earth taken into the excavated earth and sand chamber from the beginning. Since the agents are evenly mixed, it is possible to sufficiently exhibit water stopping and face collapse prevention effects.

The excavated earth taken into the excavated earth and sand chamber enters the earth and sand hopper 14 by the earth and sand packet 13 as the excavation progresses, and is discharged rearward by the waste removal device 15.

As described above, according to the present invention, the mixing of excavated soil and additives is automatically averaged, resulting in a soil that is highly effective in stopping water and preventing collapse, and is easy to dispose of. can be done reliably.

Furthermore, the present invention does not require the extra power required for stirring as in the conventional example shown in Figure 7, but rather the frictional resistance of the earth and sand is reduced by the lubricating effect of the additive, which is required to drive the cutter. This has the effect of reducing power consumption.

[Brief Description of the Drawings] Fig. 1 is a vertical sectional side view of the main parts showing an example of the implementation of the tunnel excavation machine of the present invention, Fig. 2 is a front view taken along line c-c in Fig. 1, and Fig. 3 is It is a sectional view taken along line a-a in FIG. 2. Figure 4 is a front view similar to Figure 2 showing another embodiment;
The drawings are a sectional view taken along line bb of FIG. 4, FIG. 6 is a sectional view showing a modification of FIG. 5, and FIG. 7 is a side view of a conventional center shaft type tunnel excavator. 1... Cylindrical shield body, 2... Cutter body, 2'... Excavation tool frame, 3...
...bearing, 4,5...gear, 6...
Cutter drive device, 7...Bulkhead, 8.
... Excavation soil chamber, 9 ... Additive inflow pipe,
10...Support, 1...Additive rotary joint, 12...Additive injection pipe 19...
・Cutter center, 20...Inflow channel, 21・
... Cutter bit, 22 ... Bit frame, 23.24.32.33 ... Additive injection hole, 25 ... Sediment intake port, 26.・・・・・・
Face, 27... excavated earth and sand.

Claims (1)

[Scope of utility model registration request] A cutter body having an excavator frame with a cutter pit provided on the face side is rotatably provided at the front end of the cylindrical shield body, and an excavation earth chamber is formed between the bulkhead at the rear thereof and the excavator frame. In the tunnel excavation machine, an additive inflow pipe is connected to the center of the excavation tool frame by penetrating the bulkhead and the excavation material chamber, and before the excavated material flows into the excavation material chamber from the face surface in contact with the excavation tool frame. A spout for the additive supplied to the center of the excavator frame is provided at a desired position of the excavator frame on the way to inflow, and the excavated soil is taken into the excavator chamber in a state where the excavated soil and the additive are mixed. A tunnel boring machine characterized by being configured as follows.