JPS6126474Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mud pressure shield machine suitable for the shield construction method. When constructing a horizontal shaft underground, shield construction methods and shield machines are suitable depending on the condition of the ground to be excavated, so these methods and shield machines have been widely used in recent years. The reality is that However, as a prior art of this type of construction method and equipment, there is, for example, Japanese Patent Application No. 17071 of 1983 (Japanese Unexamined Patent Publication No. 130695/1983), but this prior art does not involve stirring the excavated soil. Since the mixing blades are attached only to the rear of the cutter spokes, there is a drawback that sufficient mixing efficiency cannot be obtained when the shield machine has a large diameter. In other words, considering the function of the mud pressure shield machine as a horizontal shaft excavation device, increasing the mixing efficiency of the excavated soil will lead to increasing the mud conversion efficiency, making the excavation state more stable and more efficient. It is what it is. However, as the diameter of the mud pressure shield machine increases, it becomes necessary to mix the excavated soil sufficiently and efficiently. The outer periphery has a relatively large volume of excavated soil, and compared to the central area, it is necessary to improve the mixing effect to promote turning the excavated soil into mud. However, as described above, conventional shield machines have mixing blades only at the rear of the cutter spokes, which may cause problems when the diameter is large. The present invention was proposed in view of the above points, and in order to effectively mix the excavated soil, the radially extending cutter spokes are connected with each other by a plurality of connecting members, and a number of connecting members are connected behind the connecting members. By adding mixing blades, we aim to improve the mixing effect, and at the same time increase the rigidity of the cutter device.
The object of the present invention is to provide a pressurized mud shield machine that can also reduce turning resistance. The present invention will be explained below with reference to the drawings. Figures 1A and 1B show an embodiment of the mud pressure shield machine according to the present invention, in which 1 is a cylindrical shield tube made of, for example, a steel plate, and 2 is a shield tube formed at the front of this shield tube. Face room, 3 is this face room 2
This cutter device 3 is equipped with a fishtail-shaped tip cutter bit 4 at the tip thereof, and has a rotary shaft 6 having a mud material injection port 5, A plurality of cutter spokes 7 are radially attached to the front end of the shaft 6, and cutter bits 8 are provided in pairs at appropriate locations on the front of the cutter spokes 7.
, a kneading blade 9 provided at the rear of the katsuta souk 7 , an outer ring 10 provided at the outer end of the katsuta spoke 7 , a katsuta bit 11 with an outer ring provided in front of the outer ring 10 , and an outer ring 10 . The cutter spokes 7 are connected by a ring-shaped connecting member 13. Mixing blades 14 are provided at appropriate locations, and many mixing blades 9, 1 are installed in any space within the face chamber 2.
2 and 14 can be placed. Also, spokes 15 extending radially are provided on the rotating shaft 6 at the rear of the cutter spokes 7, and kneading blades 16 extending forward and backward are provided at the front and rear of the spokes 15, respectively. In the illustrated embodiment, a cutter bit is not provided at the front of the connecting member 13, but a cutter bit 8 may be provided at the front of the connecting member 13 in the same way as the cutter spoke 7, if necessary. Further, 17 is a drive device for driving the cutter device 3 , and is composed of a cutter drive motor 18, a rotation transmission mechanism 19 consisting of a gear mechanism, etc., and a rotation transmission shaft 20 whose tip is fixed to the rear of the cutter spoke 7. ing. Reference numeral 21 denotes a partition wall provided in the shield cylinder 1 and partitioning the face chamber 2;
1 includes a mud material injection pipe 22 for injecting mud material into the face chamber 2, a bearing 23 that pivotally supports the rear end of the rotating shaft 6 of the cutter device 3 , an earth pressure gauge 24, and an opening at the front end. A screw conveyor 25 for discharging earth, whose portion communicates with the inside of the face chamber 2, is attached. This screw conveyor 25 includes a cylindrical outer tube 27 having a soil discharge port 26 at the rear end, a screw 28 rotatably provided inside the outer tube 27, and a motor 29 for rotating the screw 28. It is. Furthermore, 30 is a retaining pipe that has been successively added, 31
is an oil jack for digging provided between the earth retaining cylinder 30 and the partition wall 21. To excavate a horizontal shaft using the mud pressure shield machine, first, the cutter device 3 is rotated by the drive device 17 to excavate the ground, and the excavated soil is introduced into the face chamber 2. Mud is injected into the tank 2 from injection pipes 22 and 5. For example, cutter device 3 cuts with clay materials such as pennite and CMC.
The mixing blades 9, 12, etc. rotate to mix the soil and turn it into highly viscous mud with a water content ratio and unit volume weight similar to that of the ground, plastic flowability, and water impermeability. 2 and screw conveyor 25
When the outer cylinder 27 is filled, the oil jack 31 is extended to apply earth pressure to the mud, and this earth pressure presses down the face and prevents it from collapsing while excavation work is performed. At this time, unless the screw 28 of the screw conveyor 25 is rotated by the motor 29, the mud in the face chamber 2 will not be discharged to the outside, so that the earth pressure in the face chamber is kept constant. In this way, as the excavation of the ground progresses and the amount of earth and sand accumulated in the face chamber 2 increases and the earth pressure increases, it is detected by the earth pressure gauge 24, and the screw 28 of the screw conveyor 25 is moved by the motor 29 according to the detection. The earth pressure inside the face chamber 2 is kept constant at all times by rotating the mud and discharging the mud to the outside from the earth discharge port 26. In this case, since the cutter device 3 of the present invention is provided with the kneading blades 14 not only at the rear of the cutter spokes 7 but also at the rear of the connecting member 13, the kneading blades 14 combined with the action of the kneading blades 12 with the outer circumferential ring are effective. A good kneading effect can be obtained. That is, in the present invention, mixing blades 9 are provided behind a plurality of cutter spokes 7 radially attached to the front end of the rotating shaft 6 as an excavating and mixing tool for mixing the excavated earth and sand accumulated in the face chamber 2 and the soil for cultivation. At the same time, a kneading blade 14 is provided behind the connecting member 13, and a kneading blade 16 is also provided on the rotary shaft 6 in the front-rear direction via spokes 15.
Furthermore, the outer ring 10 attached to the outer peripheral end of the cutter spoke 7 is also provided with a plurality of mixing blades 12 with outer rings attached at approximately equal intervals, so that the face chamber 2 is not filled with water. Of the mixture of earth and sand and soil materials present at the outer periphery, the mixture is sufficiently kneaded by a plurality of mixing blades 12 with outer rings attached to the outer ring 10, and is mixed from the outer periphery to the center. Also, those existing from the center to the outer periphery are mixed by a plurality of mixing blades 9 and 14 attached to the radial cutter spokes 7 and connecting members 13, etc., and mixing blades 16 provided on the spokes 15. The excavated soil and mud material in the face chamber 2 are sufficiently kneaded and mixed over the entire area to form a uniform, highly viscous mud. FIG. 2 shows another embodiment of the present invention, and the only difference in this embodiment is that a straight rod-like member is used as the connecting member 13', and the other configurations and functions are the same as those of the above-mentioned embodiment. Since this is the same as the example, the explanation will be omitted. As described above, according to the present invention, a plurality of cutter spokes attached to a rotating shaft and having mixing blades at the rear are connected by a connecting member having mixing blades at the rear. Compared to a case where mixing blades are simply attached only to the rear of the tunnel, a large number of mixing blades can be installed in the space within the face chamber, resulting in a better mixing effect and a more stable excavation condition. There are advantages that can be obtained. Therefore, it is more effective to attach an outer ring near the outer periphery of the cutter spoke and attach many kneading blades to the outer periphery. In addition, according to the present invention, since the connecting member is integrated with the cutter spoke, the rigidity of the entire cutter is increased, and the cutter spoke can be made more slender than in the case of a single cutter spoke. This also has the advantage of reducing turning resistance. Furthermore, whereas in the past Katsuta bits were attached to the cutter spokes, with this invention it is possible to attach Katsuta bits to the connecting member as well, and many Katsuta bits can be attached to the connecting member. Compared to the conventional Katsutabit, the excavation conditions are relaxed and it has the advantage of being able to excavate over long distances even during severe excavation work. In addition, if the cutter bit becomes worn out, it must be replaced with a new one, but with this invention, the wear and tear on the cutter bit is reduced, so there is almost no need to go out to the front of the shield machine to replace the bit, which is dangerous. First, there is the advantage that workability is not impaired due to interruptions in excavation, etc.

[Brief explanation of the drawing]

Figures 1A and 1B show one embodiment of the present invention, Figure A is a partially simplified front view, Figure 1 is a vertical sectional view, and Figure 2 is another embodiment of the invention. . 1... Shield cylinder, 2... Face chamber, 3 ... Katsuta device, 4... Tip Katsutabit, 5... Sludge material injection port, 6... Rotating shaft, 7... Katsuta spoke, 8... Katsutabit, 9, 12, 14, 16
... Kneading blade, 10 ... Outer ring, 11 ... Katsutabitsu with outer ring, 13, 13' ... Connection member, 15 ... Spoke, 17 ... Drive device, 1
8... Drive motor, 19... Rotation transmission mechanism, 20
... Rotation transmission shaft, 21 ... Partition wall, 22 ... Sludge material injection pipe, 23 ... Bearing, 24 ... Earth pressure gauge, 25
... Screw conveyor, 26 ... Soil discharge port, 27
... Outer cylinder, 28 ... Screw, 29 ... Motor, 30 ... Retaining cylinder, 31 ... Oil jack.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylindrical shield cylinder, a face chamber formed at the front part by a partition wall provided inside the shield cylinder, and a rotating shaft provided at the front part within this face chamber. and a kneading tool which is installed behind the cutter device and mixes the excavated soil taken into the face chamber together with the mud-making soil material poured into the interior to form mud. In a mud pressurized shield machine that excavates while holding down the face,
The cutter device includes a rotating shaft, a plurality of cutter spokes provided at the front end of the rotating shaft and extending radially, a plurality of cutter bits provided in front of the cutter spokes, and a plurality of cutter bits provided at the rear of the cutter spokes. multiple kneaded wings,
Mud soil characterized by being constructed of a plurality of connecting members connecting the katsuta spokes and having mixing blades provided at the rear, and a mixing blade with an outer ring provided at the outer peripheral end of the cutta spokes. Pressure shield machine. (2) The mud pressurizing shield machine according to claim 1, in which a cutter can be attached to the front part of the connecting member.