JPS6214231Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a shield excavator, and its purpose is to create a shield excavator that can prevent the kneading effect of the excavated soil taken into the pressure chamber from decreasing when the excavation diameter is large. The aim is to provide the opportunity.

That is, in the present invention, a coiled kneading blade for kneading excavated soil in a pressure chamber formed in a cutter head is supported by a rotating shaft in the front and back direction, and a pair of support arms in the front and rear directions of the rotating shaft. The rotary shaft is swingably supported on the rear partition wall of the pressure chamber, and the coiled kneading blade is swingable in forward and reverse directions. A screw conveyor-type earth removal device is provided in an atmospheric pressure chamber, and the tip of the screw blade of the screw conveyor type earth removal device for discharging the excavated soil in the pressure chamber into the atmospheric pressure chamber is located inside the coiled kneading blade.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 designates a shield main body, 2 a cutter head provided at the front of the shield main body 1 and rotatable by a rotary drive device 3, and 4 a pressure chamber formed within the cutter head 2. 5 is a coiled kneading blade (including a ribbon-shaped screw blade) for kneading the excavated soil taken into the pressure chamber 4, and as shown in FIG. A pair of front and rear support arms 7 are attached to the shaft 6,
7', and a coil portion 8 formed in an arc shape around the outer periphery of the rotating shaft 6 over approximately 360 degrees. The front end of the rotating shaft 6 is supported by the front of the cutter head 2 via a bearing 9, and the rear end is supported by the rear partition wall 10 of the pressure chamber via a bearing 11 and is provided in the atmospheric pressure chamber 12. It is interlocked and connected to a swinging device 13 that can be driven forward and backward. Note that the rotating shaft 6 has a hollow hole 1.
4 is formed, and a slurry (special clay paste) injection pipe 16 is connected to its rear end via a rotary joint 15, and a cutter head 2 is connected to its front end.
A slurry injection pipe 17 provided at the front is connected. As shown in FIG. 2, the swinging device 13 includes a cylinder device 18 supported by the shield body 1, one end of which is fixed to the rotating shaft 6, and the other end connected to a rod 18a of the cylinder device 18. It is composed of a swinging lever 19 that is
Therefore, the rod 18a of the cylinder device 18 is
When moved up and down as shown by arrow A in the figure, the coiled kneading blade 5 swings within a predetermined range around the rotating shaft 6 as shown by arrow B in FIG. 3 via the swing lever 19. Reference numeral 20 denotes a screw conveyor-type soil removal device for discharging excavated soil in the pressure chamber 4 to the atmospheric pressure chamber 12, and the screw blade 21 for soil discharge is configured in a ribbon shape. The tip of the soil removal screw blade 21 extends from the cylindrical casing 22 to the inside of the pressure chamber 4 so as to be located inside the coiled kneading blade 5, and is attached to the tip of the cylindrical casing 22. The bearing 2 is attached to the bracket 23
4, and its rear end is supported via an annular body 25 fixed to its outer periphery. The soil removal screw blade 21 is rotationally driven via the annular body 25. That is, an external gear 26 is attached to the outer periphery of the annular body 25, and a pinion 28 attached to the output shaft of a rotary drive device 27 is meshed with the external gear 26. By the way, the coiled kneading blade 5 is oscillated within a range that does not contact the soil removal screw blade 21. 29 is a gate for discharging excavated soil provided at the rear end of the cylindrical casing 22; 30 is a conveyor for discharging excavated soil provided below the gate 29; 31 is a raking blade provided in the pressure chamber 4;
A slurry injection pipe 32 is provided separately from the slurry injection pipe 16, and is connected to the rear partition wall 10 of the pressure chamber.

Therefore, according to the above configuration, the excavated soil taken into the pressure chamber 4 is raked up by the raking blades 31, and is also moved back and forth by the coiled kneading blades 5, which are oscillated forward and backward by the cylinder device 18. The soil is efficiently mixed with the slurry by being moved by the earth removal device 2.
The cylindrical casing 2 is removed by the screw blade 21 of 0.
A sand plug capable of resisting groundwater pressure and collapse earth pressure is formed there, and the gate 29 is opened and the excavated soil is discharged onto the carry-out conveyor 30. In this way, to mix the excavated soil and slurry, the ribbon-shaped kneading blades 5, which are oscillated in forward and reverse directions, are used to move the excavated soil back and forth, so even when coarse gravel is included, it is possible to mix the excavated soil efficiently. Not only can these be kneaded, but also the feeding action to the soil removal device 20, which has a tip located inside the coiled kneading blade, can be performed efficiently. In addition, since the coiled kneading blade 5 is configured in a continuous spiral,
Has low kneading resistance and is resistant to wear.

In the above embodiment, the coiled kneading blade 5 is supported by the front part of the cutter head 2 and the rear partition wall 10 of the pressure chamber, but it can also be supported in a cantilever manner only on the rear partition wall 10 side of the pressure chamber. Also,
The swing device 13 is connected to the swing lever 19 and the cylinder device 1.
8, however, it may be constructed using a rotary drive device that can freely drive in forward and reverse directions. Furthermore, the soil removal device 20
Although the screw blade 21 is configured in a ribbon shape capable of discharging gravel approximately 2/3 of the outer diameter of the blade, it may be a screw blade having a normal rotation axis at the center. Further, in FIG. 1, the cutter head 2 is constructed so that the cutter surface is vertical, but the present invention can also be applied to a structure in which the cutter surface is inclined.

As described above, according to the shield excavator of the present invention, the excavated soil taken into the pressure chamber is efficiently mixed with slurry by being moved back and forth by the coiled mixing blades that are oscillated in forward and reverse directions. The mixing effect is particularly effective when the excavation diameter is large, and the tips of the screw blades of the soil removal device are located inside the coiled mixing blades, so the excavated soil in the pressure chamber is efficiently sent to the soil removal device. be able to.

[Brief explanation of the drawing]

Fig. 1 is an overall vertical cross-sectional view of one embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - arrow in Fig. 1, and Fig. 3 is a cross-sectional view of the
It is a sectional view taken along the - arrow in the figure. 1...Shield body, 2...Katsuta head, 4
... Pressure chamber, 5 ... Coiled kneading blade, 6 ... Rotating shaft, 7, 7' ... Arm part, 8 ... Coil part,
10...Pressure chamber rear bulkhead, 12...Atmospheric pressure chamber, 1
3... Rocking device, 18... Cylinder device, 19...
... Swinging lever, 20 ... Earth removal device, 21 ... Screw blade for earth removal, 22 ... Cylindrical casing.

Claims (1)

[Scope of utility model registration request] A coiled kneading blade that mixes the excavated soil in a pressure chamber formed in the cutter head is supported by a rotating shaft in the front and back direction and a pair of front and rear support arms on this rotating shaft, and rotates approximately 360 degrees. Consists of a coil part formed in an arc shape around the outer circumference of the shaft,
The rotating shaft is swingably supported on the rear partition wall of the pressure chamber, and a swinging device for swinging the coiled kneading blades in forward and reverse directions is provided in the atmospheric pressure chamber, and the excavated earth and sand in the pressure chamber is discharged into the atmospheric pressure chamber. A shield excavator characterized in that the tip of the screw blade of the screw conveyor type soil removal device is located inside the coiled kneading blade.