JPS624628Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an earth removal device for a shield excavator.

A continuous earth removal type shield excavator uses a screw feeder type earth removal device for the purpose of preventing the face holding pressure in the excavated earth intake chamber from escaping even during earth removal. As illustrated in Fig. 1, this type of earth removal device is arranged between an excavated soil intake chamber (face pressure chamber) 1 and an earth removal chamber (atmospheric pressure chamber) 2 located behind it. It includes a cylindrical casing 3 and a screw shaft 4 housed in the casing 3. In such an earth removal device, if the cutter head 5 does not have a bearing at the end of the screw shaft 4, only the terminal end of the screw shaft 4 is supported by the bearing 6 provided in the cylindrical casing 3. Therefore, the screw shaft 4 is supported in a cantilevered state, and due to deflection and vibration due to its own weight, the starting end of the helical blade 4A comes into contact with earth and sand or the cylindrical casing 3, causing severe wear and tear. It was also in an unusable condition mechanically.

The present invention has been devised in view of the above, and examples thereof will be described below.

In Figures 2 and 3, 7 is the shield body;
8 is a cutter head, 9 is a bearing, and the cutter head 8 is supported by the shield body 7 via this bearing 9. Reference numeral 10 denotes a fixed partition wall, and the partition wall 10 divides the interior of the machine into an excavated earth and sand intake chamber 11 inside the cutter head 8 and an earth discharge chamber 12 behind it. An earth removal device 13 disposed between the excavated earth and sand intake chamber 11 and the earth removal chamber 12 is connected to the partition wall 10.
A cylindrical casing 14 fixed to the cylindrical casing 14 and a ribbon screw 1 housed within the cylindrical casing 14.
5, and a cone valve 17 provided opposite the soil discharge port 16 at the rear end of the cylindrical casing 14.
The outer periphery of this ribbon screw 15 is supported at two points, front and back, and is driven via this outer periphery. That is, expanded diameter portions 18 and 19 are formed at the starting end and the terminal end of the cylindrical casing 14, and rings 24 and 25 are supported by these expanded diameter portions 18 and 19 via bearings 20 and 21 and seals 22 and 23, Corresponding outer peripheral portions of the ribbon screw 15 are fixed to these rings 24 and 25 by welding or the like.
In the case of the ribbon screw 15, when tension (transporting force) in the longitudinal direction is applied during transportation of earth and sand, elongation occurs like a spring, so countermeasures are required. Therefore, in the illustrated example, the rings 24 and 25 are provided with flanges 26 and 27 protruding from each other, so that the loads in the thrust direction are supported by the flanges 26 and 27. In the ring 25 on the terminal end side of the cylindrical casing 14, teeth are formed around the collar 27,
These teeth mesh with the output gear 29 of the drive motor 28. This output gear 29 and drive motor 28
A rotational drive mechanism is constructed by the following. Therefore, the power of the drive motor 28 is transmitted to the collar 27, the ring 25, and the ribbon screw 15. Also, although the ribbon screw 15 is supported at two points, if the ribbon screw 15 is long or
If the rigidity of the ring is small, the rings are fixed at multiple locations in the longitudinal direction, and these rings are supported by a cylindrical casing. According to this example,
Since the ribbon screw 15 is supported at two or more points, deflection due to its own weight is prevented, and the action of the collars 26 and 27 prevents abnormal expansion and contraction. In addition, if you use the method of inputting the rotational force from the outer periphery of the ring as shown in the example,
It is also possible to interlock and connect drive motors to multiple locations on the ribbon screw 15. In addition, in FIG. 2, 30 is a hydraulic cylinder for pressing the cone valve 17.

Excavation work with a shield tunneling machine may be carried out while soil improvement is being carried out depending on the properties of the excavated soil. In such cases, soil improvement material is injected into the excavated soil intake chamber, and in this case, it is preferable to make the injection pipe as short as possible in order to reduce piping resistance. A suitable embodiment for this is shown in Figure 4. In this case, an injection pipe 32 is provided on the inner circumference of the starting end of a ribbon screw 31, and this is connected to a pipe 33.
The lantern ring 34 is connected to the casing 35. The lantern ring 34 is connected to the casing 36. The lantern ring 34 is connected to the lantern ring 35. The lantern ring 34 is connected to the lantern ring 34. The lantern ring 35 is connected to the lantern ring 36. The lantern ring 34 is connected to the lantern ring 34. The lantern ring 35 is
indicates a seal, and 39 indicates a cylindrical casing.

As is clear from the above description, according to the present invention, at least the front and rear ends of the ribbon screw housed in the cylindrical casing are supported through the rings, so that the ribbon screw is not bent during the earth removal operation. Therefore, there is no need to worry about wear caused by the ribbon screw coming into contact with the cylindrical casing. Further, since the ring supporting the ribbon screw is provided with a collar to support the thrust load, it is possible to prevent pitch errors caused by twisting or the like, that is, abnormal expansion and contraction of the ribbon screw.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of a conventional example, Fig. 2 is a longitudinal side view of an embodiment of the present invention, Fig. 3 is an enlarged longitudinal side view of the main parts in Fig. 2, and Fig. 4 is a longitudinal side view of an embodiment of the present invention. FIG. 2 is an enlarged vertical cross-sectional side view of the main parts of the different types of earth removal devices that are each provided with an injection part structure for the plastic fluidization improver. 11...Excavation soil intake room, 12...Earth removal room, 1
3...Earth removal device, 14...Cylindrical casing, 15
... Ribbon screw, 18, 19 ... Expansion part,
24, 25...Ring, 26, 27...Tsuba, 28
... Drive motor, 29 ... Output gear.

Claims (1)

[Scope of utility model registration request] A cylindrical casing is provided between the excavated soil intake chamber and the soil removal chamber behind it, and a swollen diameter portion is formed at least at the starting end and the terminal end of the cylindrical casing, and a ring is installed in each of these swollen diameter portions. is rotatably supported, a ribbon screw is rotatably housed in the cylindrical casing, and the outer periphery of the front and rear ends of the ribbon screw is fixedly supported on the inner peripheral surface of the ring, and at least one of the rings is rotated. A shield excavator connected to a drive mechanism, having a flange protruding from the outer periphery of each ring, and configured so that the thrust load acting on the ribbon screw is supported by the cylindrical casing via the flange. Earth removal equipment.