JPH0320398Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shield excavator, and in particular, the excavated earth and sand discharged from the screw conveyor for earth removal are pumped into the earth removal line by a piston pump method at the earth removal port. It was designed to be transported under pressure.

[Prior Art] In general, a shield excavator is equipped with a rotary cutter at the front end of a cylindrical shield frame, and transports earth and sand excavated by the cutter into a screw conveyor installed along the shield frame. It is known that the shield frame is carried out to the rear of the shield frame. As a means for further discharging the earth and sand carried out by the screw conveyor to the outside of the tunnel, a belt conveyor is arranged at the earth discharge port of the screw conveyor, and the earth and sand is conveyed in a slurry manner by this belt conveyor. There is a method in which the soil is loaded onto a trolley and carried out, and a method in which a slurry removal line is connected to the soil discharge port of the screw conveyor to transport the soil as a slurry.

[Problems to be solved by the invention] However, in the case of the former belt conveyor/truck transport method, not only is it easy to drop dirt and soil during transportation, polluting the inside of the tunnel, but also when the moisture content of the sand is high, The disadvantage is that it liquefies, making transportation difficult. On the other hand, although the latter slurry transportation method does not have such drawbacks, it does require pump equipment, muddy water treatment equipment, etc., resulting in high costs.

Therefore, the present invention was devised to effectively eliminate these various drawbacks, and it is possible to remove the excavated soil discharged from the screw conveyor without changing its properties and without polluting the inside of the tunnel. The purpose of the present invention is to provide a shield excavator that can be pumped to a line and requires no equipment cost.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a shield excavator having a screw conveyor for soil removal. The earth and sand inlets of the two parallel pressure cylinders are connected to each other through inlet gates that are closed during extrusion, and outlet gates that are closed when suctioning earth and sand and opened when extruding earth and sand are connected to the discharge ports of these cylinders. The excavated earth and sand discharged from the screw conveyor are connected to an earth discharge line which merges and discharges the earth and sand, and is configured so that the excavated earth and sand discharged from the screw conveyor is continuously forced into the earth discharge line by pressure feeding cylinders that are driven alternately.

[Operation] The earth and sand carried out from the soil discharge port of the screw conveyor is sucked by the pressure cylinder by opening the inlet gate and closing the outlet gate.
This suctioned earth and sand is forced into the earth discharge line by the pressure feeding cylinder when the inlet gate is closed and the outlet gate is opened. In particular, since two of the pressure cylinders are provided in parallel, earth and sand can be continuously pumped to the earth removal line by driving the pressure cylinders alternately.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a cylindrical shield frame of a shield excavator, and an excavation cutter 2 is rotatably provided at the front end of the shield frame. This cutter 2 has a cutter chamber 3 on the back side for storing excavated soil, and a screw conveyor 4 is used to transport the excavated soil taken into this cutter chamber 3 to the rear of the shield frame 1. The inlet 4a is inserted into the cutter chamber 3. The rear end of the screw conveyor 4 extends from the rear end of the shield frame 1, and has an earth discharge port 4b.
A pressure cylinder 6 is provided for pumping the excavated earth and sand to the rear earth removal line 5.
As shown in FIGS. 2 to 4, the pressure-feeding cylinder 6 is composed of a cylindrical cylinder body 7 and a piston 8 slidably inserted into the cylinder body. A discharge port 7a for pumping and discharging excavated soil is formed, and an inlet port 7b for introducing discharged soil from the screw conveyor 4 is formed in the side wall of the cylinder body near the discharge port. In the embodiment, two pressure cylinders 6 are connected in parallel to the soil discharge port 4b of the screw conveyor 4, and their respective discharge ports 7a are merged into one.

Each of the inlet ports 7b of the pressure-feeding cylinder 6 is provided with a sliding inlet gate 9 for opening and closing them, and each gate is connected with a gate drive jack 9a for opening and closing the gates. Further, the discharge port 7a of the pressure-feeding cylinder 6 is also provided with an exit gate 10 for opening and closing the discharge port 7a, similar to the above-mentioned inlet gate 9. Therefore, by opening and closing the inlet gate 9 and the outlet gate 10 alternately in accordance with the reciprocating movement of the piston 8 as described later, the waste soil sent from the screw conveyor 4 can be introduced through the inlet 7b and discharged. It is designed to be fed under pressure from the excavation 7a.

A piston driving jack 11 is used as a means for reciprocating the piston 8. In the embodiment, the piston 8 is formed into a cylindrical shape with a bottom, and the jack 11 is located inside the cylinder so that one end of the jack is connected to the piston 8. They are provided at the inner bottom, with the other end connected to the end of the cylinder 7 on the opposite side from the discharge port 7a.

The pressure-feeding cylinder 6 configured in this manner is provided with its inlet 7b connected to the soil discharge port 5b of the screw conveyor 4, and its discharge port 7a facing the rear of the shield frame 1. A discharge line 5 for guiding discharged soil out of the tunnel is connected to the discharge port 7a. Note that the earth removal line 5 made of a pipe body is normally guided to the vertical shaft which is the exit of the tunnel, but instead of being guided in this way, it is guided to a place in the tunnel where the waste transport vehicle is located, so that the earth will be carried out later without any waste. It may also be carried out using a transport vehicle.

12 in Figures 1 and 4 is screw conveyor 4
This is a soil discharge gate provided in the soil discharge port 4b so as to be openable and closable.

Next, the operation of the above embodiment will be described.

The shield excavator excavates the ground by moving forward while rotating the cutter 2, and takes in the excavated earth and sand into the cutter chamber 3, carries it out backwards by the screw conveyor 4, and discharges it. It is discharged from the soil opening 4b. In this case, the soil discharge gate 12 at the soil discharge port 4b of the screw conveyor 4 is open, and now, as shown in FIG. In this state, by retracting the piston 8, the earth and sand discharged from the earth discharge port 4b of the screw conveyor 4 is sucked into the cylinder body 7. In this state, first close the inlet gate 9 as shown in b and c of the same figure, then start compressing the piston 8 while pushing it forward, and then open the outlet gate 10 as shown in d of the figure.
to open. Therefore, as the piston 8 moves forward, the earth and sand in the cylinder body 7 are discharged from the discharge port 7 of the pressure-feeding cylinder 6.
It is extruded while being compressed from a, and is sent under pressure to the soil discharge line 5. When the piston 8 reaches the bottom dead center in this manner, the outlet gate 10 is closed as shown in e and f of the same figure, and then the inlet gate 9 is opened to cause the piston 8 to retreat. As a result, the earth and sand discharged from the earth discharge port 4b of the screw conveyor 4 is sucked and introduced into the cylinder body 7 again. When the piston 8 reaches the top dead center in this way, the inlet gate 9
By repeating the operation cycles a to g in Figures 5 and 6, such as closing the piston 8 and starting the forward movement of the piston 8, and by alternately moving the left and right pistons 8, the discharged soil can be continuously pumped. will be done.

As mentioned above, the inlet gate 9 is provided at the inlet port 7b of the pressure-feeding cylinder 6, and the outlet gate 1 is provided at the outlet port 7a.
0 are provided in each case, the inlet gate 9 is opened and the outlet gate 10 is closed in the suction process of the piston 8, and by doing the opposite in the compression process, it is possible to prevent the backflow of earth and sand from the discharge port 7a in the suction process. At the same time, it is possible to prevent the earth and sand from flowing out to the inlet 7b during the compression process, and the earth and sand can be smoothly pumped. In addition, these gates 9 and 10 can prevent the communication pipe phenomenon from the cutter chamber 3 to the earth removal line 5, so it can be used even under high water pressure, and the water pressure at the face can be shut off. It is possible to stabilize the situation. Furthermore, since the earth and sand discharged from the screw conveyor 4 can be pumped as is without changing its properties (properties/states), there is no need for classification equipment in muddy water treatment plants, etc., which reduces manufacturing costs and construction costs. It is possible to reduce the Furthermore, the earth and sand can be directly discharged onto the waste transport vehicle via the earth discharge line 5, or directly carried out of the tunnel, and the environment inside the tunnel can be improved without any earth and sand falling over.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) An inlet gate is provided at the inlet of the pressure-feeding cylinder, and an outlet gate is provided at the discharge port, so it is possible to reliably prevent backflow of earth and sand, as well as prevent the phenomenon of a communication pipe from the screw conveyor to the earth discharge line. It can also be used under high pressure water, and the face can be stabilized.

(2) Equipped with two pressure feeding cylinders in parallel,
By driving the pressure cylinders alternately, earth and sand can be continuously pumped to the earth removal line.

(3) The excavated earth and sand discharged from the screw conveyor can be pumped as is without changing its properties, and the subsequent treatment of the earth and sand is easy and equipment costs are low. Also, there is no spillage of soil and sand, which improves the environment inside the tunnel.

[Brief explanation of the drawing]

The figure shows a preferred embodiment of the present invention.
The figure is a side sectional view of the entire shield tunneling machine, Figure 2 is an enlarged cross-sectional view of Figure 1 - Figure 3 is Figure 2 -
Line sectional view, Figure 4 is an enlarged line sectional view of Figure 1,
5 and 6 are graphs showing the operating cycle of the pressure-feeding cylinder and schematic diagrams showing the operating states at points a to g in the graph. In the figure, 4 is a screw conveyor, 4b is a soil discharge port, 5 is a soil discharge line, 6 is a pressure cylinder, 7a is a discharge port, 9 is an inlet gate, and 10 is an outlet gate.

Claims (1)

[Scope of utility model registration request] In a shield excavator having a screw conveyor for earth removal, the earth and sand inlet ports of two parallel pressure cylinders are connected to the earth discharge port of the screw conveyor through inlet gates that are opened when suctioning earth and closed when extruding earth. At the same time, soil discharge lines are connected to the soil discharge ports of these pressure-feeding cylinders, which combine and discharge soil through exit gates that are closed when soil is sucked in and opened when soil is extruded. 1. A shield excavator characterized in that the excavated soil is continuously pumped to an earth removal line by pumping cylinders that are driven alternately.