JP3752660B2 - Shield excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention also relates to the shield excavator [0002]
[Prior art]
FIG. 4 shows a schematic configuration of a general conventional shield excavator. This shield excavator 10 is provided with a front torso 2 provided with a cutter 1 for excavating natural ground at the front of a skin plate 3 constituting the outer shell thereof so as to be able to swing. Inside, there are various mechanisms such as a mechanism for sending the excavated earth and sand, an erector for assembling the segment 7 into a predetermined shape, a propulsion jack 4 for propelling the shield excavator 10 by obtaining reaction force from the assembled segment. Is provided.
[0003]
This shield excavator 10 has a long tail portion of the skin plate 3 and is capable of assembling a segment 7 for two rings, one ring more than a normal shield excavator. It contributes to high-speed construction.
[0004]
[Problems to be solved by the invention]
However, the shield excavator 10 having a long overall length as described above has a problem that it is difficult to perform sharp curve construction.
[0005]
In view of the above circumstances, an object of the present invention is to provide a shield excavator capable of extending the overall length, which can cope with sharp curve construction.
[0006]
[Means for Solving the Problems]
The shield excavator according to the first aspect of the present invention is such that at least a part of the length direction of the skin plate constituting the outer shell of the shield excavator is arranged coaxially and is slidable relative to the axial direction. It is composed of a combination of two cylinders made possible, and the two cylinders are combined as a double structure of an outer cylinder and an inner cylinder arranged on the inner periphery of the outer cylinder, The outer cylinder and the inner cylinder are wrapped in the thickness direction by fitting a concave portion and a convex portion formed on the opposing circumferential surfaces of the outer cylinder and the inner cylinder .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional side view showing the overall configuration of a shield excavator common to the embodiments. This shield excavator 20 is provided with a front torso 2 provided with a cutter 1 for excavating a natural ground at the front of the skin plate 3 constituting the outer shell so as to be swingable. Various mechanisms such as a mechanism for sending the excavated earth and sand, an erector for assembling the segment 7 into a predetermined shape, and a propulsion jack 4 for propelling the shield excavator 20 by obtaining a reaction force on the assembled segment are provided. Therefore, the tail portion of the skin plate 3 is constituted by a combination of the fixed cylinder 3A and the movable cylinder 3B.
[0012]
The movable cylinder 3B is coaxially arranged with respect to the fixed cylinder 3A and is slidably combined in the axial direction. By sliding the movable cylinder 3B in the arrow direction, the length of the tail portion of the skin plate 3 is increased. The height can be adjusted.
[0013]
That is, as shown in FIG. 1A, if the movable cylinder 3B is extended rearward, the total length of the shield excavator 20 can be increased to L1, and as shown in FIG. If the movable cylinder 3B is retracted, the total length of the shield excavator 20 can be shortened to L2. In this case, the expansion / contraction length of the movable cylinder 3B is set according to the width of the segment 7 (length in the axial direction), etc., and the length of the tail portion corresponds to the segment 7 of two rings. When the length of the tail portion is shortened, it corresponds to the segment 7 of one ring.
[0014]
In this way, when the tail portion of the skin plate 3 is configured by the combination of the fixed cylindrical body 3A and the movable cylindrical body 3B, if these are simply configured by a dual structure of the inner cylindrical body and the outer cylindrical body, The thickness will increase. Therefore, in the present invention, the fixed cylinder 3A and the movable cylinder 3B are combined in a state of being wrapped in the thickness direction. Specific examples of the structure will be described below.
[0015]
In the structure of the first embodiment shown in FIG. 2, the tail portion of the skin plate 23 is composed of a combination of an inner cylinder 23A as a fixed cylinder and an outer cylinder 23B as a movable cylinder disposed on the outer periphery thereof. is doing. And the inner cylindrical body 23A and the outer cylindrical body 23B are made thick by fitting the wave-shaped concave parts 25A, 25B and the convex parts 24A, 24B formed on the opposing circumferential surfaces of the inner cylindrical body 23A and the outer cylindrical body 23B. While wrapping in the vertical direction and maintaining the strength of the cylinders 23A and 23B (the cylinders 23A and 23B have a corrugated shape in cross section, the axial strength increases), The overall thickness of the tail is kept small.
[0016]
In the shield excavator having such a tail structure, as described above, the entire length of the shield excavator can be increased by sliding the outer cylinder 23B to the rear side, and the outer cylinder 23B is moved to the front side. The total length of the shield excavator can be shortened by sliding. Therefore, for normal straight construction, set the overall length long and dig in the tail part for two rings, and for sharp curves, set the full length short and use one ring for the tail part. Dig up. By doing in this way, it can respond also to a sharp curve construction, corresponding to high-speed construction. In addition, since the width | variety of the segment 7 is also small in a sharp curve part, even if a tail part becomes short, the function as a shield excavator is not impaired at all.
[0017]
Here, the mechanism for sliding the outer cylindrical body 23B is not shown, but the sliding of the outer cylindrical body 23B may be performed by a dedicated drive mechanism or may be performed using a propulsion jack. However, it may be performed manually using a chain block, a winch or the like.
[0018]
3A and 3B show the structure of the tail portion of the skin plate 33 of the second embodiment. In this structure, the movable cylindrical body 33B constituting the skin plate 33 is configured by an assembly of a large number of rods 32 arranged in a cylindrical shape with the axis line aligned, and the fixed cylindrical body 33A is configured such that each rod 32 is in the axial direction. It is comprised with the cylindrical aggregate | assembly of the pipe 31 inserted slidably. The ends of the rods 32 are connected in a ring shape by a connecting ring 35, and the pipes 31 are all connected together. Instead of the aggregate of pipes 31, a porous cylinder (hollow cylinder) provided with a large number of insertion holes for the rod 32 within the thickness of the peripheral wall may be used. The rod 32 may be solid or hollow.
[0019]
In such a structure, each rod 32 is slidably inserted with respect to the pipe 31, so that the movable cylinder 33 </ b> B made of the aggregate of the rods 32 is fixed to the fixed cylinder 33 </ b> A made of the aggregate of the pipes 31. Thus, it is slidable in the axial direction. Therefore, it can be used in the same manner as in the first embodiment. In addition, in the case of this structure, the thickness of the tail portion of the skin plate 33 is determined by the diameter of the pipe 31, so that the thickness of the tail portion can be suppressed. Further, since the relationship between the pipe 31 and the rod 32 is the same as that of the hydraulic cylinder, a hydraulic jack that drives the rod 32 to extend and contract between the pipe 31 and the rod 32 by enclosing the hydraulic oil in the pipe 31 is provided. It can also be configured. By doing so, the sliding operation of the movable cylinder 33B can be performed using the function as its own hydraulic jack.
[0020]
In the first embodiment, the inner cylinder 23A is positioned forward and the outer cylinder 23B is positioned rearward. However, the inner cylinder 23A may be positioned reversely. Further, in the second embodiment, the fixed cylinder 33A is constituted by the aggregate of the pipes 31 and the movable cylinder 33B is constituted by the aggregate of the rods 32. That is, the fixed cylinder 33 </ b> A may be configured by an assembly of rods 32, and the movable cylinder 33 </ b> B may be configured by an assembly of pipes 31.
[0021]
Moreover, in the said embodiment, although the combined structure of two cylinders (Inner cylinder 23A, Outer cylinder 23B, Fixed cylinder 33A, Movable cylinder 33B) was arrange | positioned in the tail part of the skin plate, it extended further forward You may arrange | position, and you may comprise the full length of a skin plate by the combination of two cylinders.
[0022]
Further, the shape of the shield excavator is not limited in any way, and may be matched with the cross-sectional shape of the tunnel to be constructed, for example, in addition to a circular shape in cross-sectional view and a rectangular shape in cross-sectional view. Moreover, in the said shield excavator, although it is set as the combination of two cylinders, it is good also as a combination of three or more cylinders.
[0023]
【The invention's effect】
As described above, according to the invention of claim 1, at least a part of the length direction of the skin plate is constituted by a combination of two cylinders that are relatively slidable. The total length of the shield excavator can be adjusted. Therefore, it is possible to achieve high-speed construction by setting the total length longer during straight construction, and it is possible to cope with shortening the total length during sharp curve construction. Further, since the two cylinders are combined in a state of being wrapped in the thickness direction, the thickness of the part can be suppressed without reducing the strength of the cylinder as much as possible.
[0024]
Furthermore , two cylinders are comprised by the outer cylinder body and the inner cylinder body, and the outer cylinder body and the inner cylinder body are made into thickness direction by fitting the recessed part and convex part of the peripheral surface of an outer cylinder body and an inner cylinder body. As a result, the overall thickness can be reduced while maintaining the strength of the cylinder.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional side view showing the overall configuration of a shielded excavator according to the present invention, in which (a) shows a state in which the entire length of the shield excavator is extended, and (b) shows a state in which the total length is shortened. FIG.
FIG. 2 is an enlarged view of a main part showing a relationship between a fixed cylinder and a movable cylinder of the shield excavator according to the embodiment of the present invention.
3A is an enlarged view of a main part showing a relationship between a fixed cylinder and a movable cylinder of a shield excavator according to another embodiment of the present invention, and FIG. 3B is a cross-sectional view thereof.
FIG. 4 is a schematic side sectional view showing an example of a conventional shield excavator.
[Explanation of symbols]
3 skin plate 3A fixed cylinder 3B movable cylinder 20 shield excavator 23 skin plate 23A inner cylinder 23B outer cylinder 24A convex part 24B convex part 25A concave part 25B concave part 31 pipe 32 rod 33 skin plate 33A fixed cylinder 33B movable cylinder body

Claims (1)

A combination of two cylinders in which at least a part of the length direction of the skin plate constituting the outer shell of the shield excavator is coaxially arranged and can be expanded and contracted by being relatively slidable in the axial direction. The two cylinders are combined as a double structure of an outer cylinder and an inner cylinder disposed on the inner periphery of the outer cylinder, and the outer cylinder and the inner cylinder face each other. A shield excavator characterized in that the outer cylinder and the inner cylinder are wrapped in the thickness direction by fitting the concave and convex portions formed on the peripheral surface .

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