JPH0229838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield excavator, and more particularly to a so-called mud-adding type sealed mechanical shield excavator in which a sealed excavation chamber is formed at the back of a cutter head and partitioned by a partition wall. It is something.

Conventional sealed mechanical shield excavators fill the sealed chamber with excavated soil while cutting, perform primary agitation, and then transport the soil from the sealed chamber using a screw conveyor, rotary feeder, belt conveyor, etc. They are extracted, loaded onto steel trucks, etc., and discharged outside.

However, in such conventional closed mechanical excavators, the fluidity of the excavated soil is insufficient, and the workability of excavating the excavated soil is low, which may lead to a decrease in the workability of excavation. In addition, in order to increase the fluidity of excavated soil and promote its discharge, a large amount of fluidizing agent such as mud is required, and large-scale equipment for supplying a large amount of fluidizing agent is required, resulting in high equipment costs. Not only is this necessary, but the configuration and operation of the stirring tool are complicated in order to ensure sufficient stirring of the excavated soil and fluidized material in a closed room, and it cannot be applied to stirring and discharging highly viscous excavated soil. Furthermore, since the excavator was not particularly equipped with a device for transporting earth and sand, there was a problem that there was a limit to improving the efficiency of transporting earth and sand from the closed room.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shield excavator which solves the above-mentioned conventional problems and can significantly improve excavation workability.

The shield excavator of the present invention is a shield excavator equipped with a cutter head at the distal end of the excavator, and includes an earth excavation sealed chamber separated by a partition wall at the back of the cutter head, and a shield excavator equipped with a cutter head at the tip of the cutter head. A primary stirring blade, a secondary stirring blade disposed in the sealed earth excavation chamber, an excavated soil discharge device connected to the sealed earth excavation chamber, and injection of water or a fluidizing material into the sealed earth excavation chamber. The fluidizing material injecting device includes at least an injection pipe opened at the partition wall and the secondary stirring blade in the soil excavation sealed chamber, and the fluidizing material injecting device Therefore, the fluidizing material is injected not only from the wall of the sealed earth excavation chamber but also from the stirring blade part, and the earth excavation discharge device is equipped with an earth excavation discharge pipe and a sand pressure pump, and the earth and sand pressure pump is It is characterized in that it is placed immediately after the soil excavation sealed chamber.

Preferably, partition walls are provided between the primary stirring blade and the secondary stirring blade and between the secondary stirring blade and the partition wall.

The present invention will be described in further detail below with reference to embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view of a shield tunneling machine 10 according to an embodiment of the present invention, in which FIG. 1A shows a leading portion thereof, and FIG. 1B shows a portion following this leading portion. has been done. Also, Figures 2 to 6
Each figure is a cross-sectional view taken along line 1--1 in FIG.

In the figure, 12a, 12b, 12c, 12
d and 12e are skin plates, and an open cutter head 14 is attached to the tip of the skin plate 12a. This cutter head 14 is rotated by a cutter drive motor 16, and is rotated by a gear mechanism 18 consisting of a gear provided on the inner peripheral side of the cutter wheel 15 of the cutter head 14 and a gear attached to the motor 16. Rotation of the motor 16 is transmitted to the head 14.

Reference numeral 20 denotes a partition wall that forms an earth excavation sealed chamber 22 at the front end of the shield excavator 10. Partition walls 24 and 26 are provided within the sealed soil excavation chamber 22 to divide the sealed soil excavation chamber 22 into three chambers. In the figure, 25 and 27 are partition wall openings, respectively. A blade for stirring the excavated soil is provided in the excavated soil sealed chamber 22. One of them is a primary stirring blade 28, which is attached to the cutter head 14. The other one is a secondary stirring blade 30, which is rotated by a secondary stirring blade drive motor 32.

34 is a piston-type earth and sand pump,
The earth and sand stirred in the earth excavation sealed chamber 22 are discharged through a discharge pipe 36.
It is discharged to the outside through. 38 is an electric motor, 4
0 is an oil tank, and 42 is a main pump.
The earth excavation sealed chamber 22 is partitioned into three chambers, a primary stirring section, a secondary stirring section, and a pump hopper section, by partition walls 24 and 26 having openings 25 and 27, and the earth and sand pressure pump 34 is connected to this sealed chamber. It is directly attached to the partition wall 20 of the pump 22, and the inner part of the sealed chamber 22 is used as the part that should be the original hopper of the pump.

An injection pipe 44 for injecting water or a fluidizing material is arranged in the excavated sealed chamber 22, and an injection port 46a,
Water or fluidizing material is injected into the sealed chamber 22 from 46b, 46c, 46d, . . . .

In addition to the above-mentioned mechanisms, the shield excavator 10 has a built-in mechanism such as an earth-and-sand pump unit, a cutter, and pump unit machinery related to stirring and jacking, so the length of the machine is long. For this reason, the shield tunneling machine is not a single piece, but a divided body made up of multiple joints. For these joints, each skin plate 12a, 12b, 12
c... is equipped with an intermediate shield jack 48.
In addition, in FIG. 1B, 52 is a pump unit,
54 is electrical equipment, 56 is a hydraulic jack for advancing the propulsion machine, and 58 is an assembled segment.

The shield excavator 10 configured in this way is
Cutting is carried out using an open type cutter head 14 having an appropriate number of spokes, the excavated soil is filled and stirred in the excavated soil sealed chamber 22 provided at the rear of the cutter, and the excavated soil is excavated outwardly using an earth and sand pump 34. Discharge. During this series of work steps, depending on the ground, water is poured into the excavated soil or fluidized material is injected as appropriate.

As mentioned above, the stirring equipment is configured to perform two steps, the primary and secondary steps.
For the primary stirring, the cutter head 14 is rotated and the excavated soil is stirred at the same time. The secondary stirring is performed by a separate drive from the primary stirring, and a plurality of secondary stirring blades 30 each having a large number of stirring blades 31a mounted on a rotating shaft 31 are provided, and these secondary stirring blades 30 are constructed so that they can rotate in forward and reverse directions and can change their rotational speeds. Since the stirring mechanism has been improved in this way, the fluidity of the excavated soil is increased, the excavated soil discharge workability is improved, and the excavation workability is improved.

In particular, in the above embodiment, since water or a fluidizing agent can be injected when stirring the excavated soil, the excavated soil can be more thoroughly stirred and made into a fluid having sufficient fluidity. Then, this excavated soil is transferred to the excavated soil sealed chamber 22 by a piston-type soil pressure pump 34.
It can be directly pumped and discharged from inside the pipe. This method, especially for small-diameter shields, prevents the danger of using steel trucks inside the mine, eliminates the need to wait for excavation when transporting steel trucks, and enables continuous excavation.
As a result, work efficiency is significantly improved, and there is an effect that soiling inside the tunnel due to earth excavation when loading earth and sand into a steel car is prevented.

[Brief explanation of drawings]

FIG. 1A and FIG. 1B are longitudinal sectional views of a shield tunneling machine according to an embodiment of the present invention, FIG.
3, 4, 5, and 6 are cross-sectional views taken along lines 1--, --, -, -, and-, respectively. DESCRIPTION OF SYMBOLS 10... Shield excavator, 12a-12e... Skin plate, 14... Cutter head, 20... Partition wall, 22... Earth excavation sealed chamber, 24, 26... Partition wall,
28... Primary stirring blade, 30... Secondary stirring blade, 34... Sediment pressure pump, 36... Discharge pipe, 44... Injection pipe, 5
0...Sediment pressure pump unit.

Claims (1)

[Scope of Claims] 1. In a shield excavator equipped with a cutter head at the tip of the excavator, there is provided an earth excavation sealed chamber separated by a partition wall at the back of the cutter head, and 1 attached to the cutter head. a secondary stirring blade, a secondary stirring blade disposed in the soil excavation sealed chamber, and an excavated soil discharge device connected to the soil excavation sealed chamber;
a fluidizing material injection device for injecting water or a fluidizing material into the soil excavation sealed chamber, and the fluidizing material injection device has an opening at least in the partition wall portion and the secondary stirring blade portion in the soil excavation sealed chamber. The fluidizing material injection device injects the fluidizing material not only from the wall of the soil excavation closed chamber but also from the stirring blade section, and the soil excavating discharge device is configured to discharge the excavated soil. 1. A shield excavator comprising a pipe and a sand pump, the sand pump being disposed immediately after the earth excavation sealed chamber. 2 between the primary stirring blade and the secondary stirring blade, and 2
The shield tunneling machine according to claim 1, wherein a partition wall is provided between each of the secondary stirring blades and the partition wall.