JP3845784B2 - Shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine for excavating underground and constructing a tunnel.
[0002]
[Prior art]
For example, Japanese Patent Laid-Open No. 6-146776 discloses a multi-shield shield machine that widens the main body of the shield machine when it is desired to change the cross section of a part of the tunnel. FIG. 10 is a cross-sectional plan view of the multiple shield machine disclosed in the above publication. As shown in FIG. 10, the conventional multiple shield machine has circular left and right main cutters 51, 52 and circular sub-cutters 53 positioned on the back side between these cutters 51 to 53. It is configured to have a left and right main shield portions 57 and 59 and a central sub shield portion 61 attached to the front surface portion of the shield frame 55 having a contour shape corresponding to the front shape of is there.
[0003]
The shield frame 55 is divided into three in the vertical direction in the direction parallel to the axial center of the main cutters 51 and 52, and from the three frame portions of the main shield frame portions 55a and 55b and the central shield frame portion 55c arranged on both sides. It is configured. Each divided portion is provided with a slide guide mechanism that can slide a certain amount in the left-right direction, and the left and right main shield portions 57, 59 are respectively slid in the left-right direction with respect to the central sub-shield portion 61. It is configured so that it can be widened.
[0004]
Further, as a technique for facilitating excavation of a steep curvature during tunnel excavation, for example, a multiple-type intermediate folding shield excavator having a folding function as disclosed in JP-A-3-208987 is known.
[0005]
Furthermore, in shield construction, due to the influence of various conditions such as soil conditions, construction method, and balance of the center of gravity of the shield machine, the shield machine body rolls (rotates) in a plane that is gradually perpendicular to the digging axis while digging. ). When the shield machine main body rolls in this way, it adversely affects the workability, segment assembly accuracy, etc., so it is necessary to correct the rolling and return it to the normal posture.
Moreover, it may be necessary to construct | assemble a tunnel helically by digging while rolling a shield machine main body intentionally on the plan of construction alignment.
[0006]
As a technique for rolling the shield machine from such a need, for example, a front barrel 70 including a cutter portion is divided like a multi-section shield machine shown in Japanese Patent Application Laid-Open No. 3-281892 shown in FIG. However, there is a method in which each of them can be bent in the vertical direction and a rotational force is generated using this structure.
[0007]
[Problems to be solved by the invention]
Due to the recent diversification of shield construction, complex shield construction is required, and efficiency of construction is also demanded.
However, each shield excavator described above has a single mechanism of any one of a widening function, a folding mechanism, and a mechanism for generating a rolling force, and is not capable of sufficiently dealing with complex shield work in recent years. Absent. Therefore, it is conceivable to mount each of the conventional mechanisms on a single shield machine, but the shield machine will increase in size with the conventional mechanism, which is not preferable in terms of cost and construction efficiency. It will be.
Under such circumstances, it has been desired to develop a shield machine having a simple structure and a plurality of functions.
[0008]
The present invention has been made to solve such a problem, and an object thereof is to provide a shield machine having a simple structure and a plurality of functions.
[0009]
[Means for Solving the Problems]
The shield machine according to the present invention has a tunnel building portion on the rear end side, a main body block formed with a convex curved surface curved in the horizontal direction and the vertical direction at the front end, and a excavation mechanism on the front end side, And a plurality of excavations connected to the front of the main body block so as to be movable along the convex curved surface with a concave curved surface formed along the convex curved surface formed at a rear end thereof. And a block.
[0010]
The main body block includes a plurality of tunnel building blocks that can be widened in the width direction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a shield machine according to an embodiment of the present invention. In the figure, 1 is a shield machine, a main body block 3 having a substantially T-shaped cross section, left and right excavation blocks 9, 11 installed on the front left and right of the main body block 3 and having excavation mechanisms 5, 7 on the front end side, The left and right building blocks 13 and 15 are provided on the rear left and right of the main body block 3 and have tunnel building portions on the rear end side.
[0012]
As shown in FIG. 2, the main body block 3 is formed with a convex curved surface 3a curved in the horizontal direction and the vertical direction at the front end thereof, and a communication port 17 communicating with the left and right excavation blocks 9 and 11 near the center of the convex curved surface 3a. , 19 are provided. Further, a tunnel construction unit 3b for constructing a tunnel is provided on the rear end side of the main body block 3.
Concave surfaces 9 a and 11 a are formed at the rear ends of the left and right excavation blocks 9 and 11 along the convex surface 3 a of the main body block 3. The left and right excavation blocks 9 and 11 are connected to the main body block 3 so as to be movable in the vertical and horizontal directions along the convex curved surface 3a with the concave curved surfaces 9a and 11a facing the convex curved surface 3a of the main body block 3, respectively. Yes.
The left and right building blocks 13 and 15 are configured to be widened in the width direction with respect to the main body block 3.
[0013]
3 is a plan sectional view of the shield machine 1 shown in FIG. 1, and FIG. 4 is an enlarged view of a portion C circled in FIG. Hereinafter, the structure of the connecting portion between the left and right excavation blocks 9 and 11 and the main body block 3 in the shield machine 1 will be described with reference to FIGS.
3 and 4, reference numerals 21 and 23 denote connecting pipes formed so as to protrude rearward at substantially the center portions of the concave curved surfaces 9a and 11a of the left and right excavation blocks 9 and 11, respectively, and flanges 21a and 21a, 23a is formed. Further, convex portions 21b and 23b projecting forward are formed on the outer peripheral portions of the flanges 21a and 23a, respectively. In the left and right excavation blocks 9 and 11, the connecting pipes 21 and 23 are inserted into the communication ports 17 and 19 of the main body block 3, and the convex portions 21 b and 23 b of the flanges 21 a and 23 a are brought into contact with the inner surfaces of the communication ports 17 and 19. The convex curved surface 3a of the main body block 3 and a part of the concave curved surfaces 9a, 11a of the left and right excavation blocks 9, 11 are brought into contact with each other and connected to the main body block 3. Each contact portion is provided with ring-shaped water-stopping packings 25 and 26.
A fixed gap is provided between the connecting pipes 21 and 23 and the communication ports 17 and 19, and the left and right excavation blocks 9 and 11 are configured to move in any direction such as up and down and left and right by the gap. ing.
[0014]
FIG. 5 is a cross-sectional view taken along the line AA in FIG. In the figure, reference numerals 27a, 27b to 33a, 33b (in FIG. 5, the part relating to the left excavation block 9 is attached with a subscript a and the part relating to the right excavation block 11 is attached with a subscript b). These jacks are fixed to the flanges 21a and 23a and the other end thereof to the main body block 3 so as to be swingable. These jacks 27a, 27b to 33a, 33b are expanded and contracted to allow the left and right excavation blocks 9, 11 to be extended. It can be moved relative to the main body block 3. That is, the right and left excavation blocks 9 and 11 can be moved to the left and right by expanding and contracting the jacks 27a and 27b and 29a and 29b, and the left and right excavation blocks 9 and 11 can be expanded and contracted by extending the jacks 31a, 31b and 33a and 33b. Can be moved up and down.
[0015]
Next, the operation | movement at the time of excavating a natural ground by this Embodiment comprised as mentioned above is demonstrated. When it is desired to roll the shield machine 1 during excavation, as shown in FIG. 6, for example, by excavating with the left excavation block 9 facing downward and the right excavation block 11 facing upward, The resistance force acts as a rolling force, and the shield machine 1 can be rolled. In the case of the state shown in FIG. 6, a rolling force in the clockwise direction acts. In order to generate a counterclockwise rolling force, the digging may be performed with the left excavation block 9 facing upward and the right excavation block 11 facing downward.
[0016]
Further, when it is desired to change the course upward during the excavation, the excavation may be performed with both the left and right excavation blocks 9 and 11 facing upward as shown in FIG. When it is desired to change the course downward, the right and left excavation blocks 9 and 11 may be both excavated downward.
Furthermore, when it is desired to change the course to the right, as shown in FIG. 8, the left and right excavation blocks 9 and 11 may both be directed rightward. When it is desired to change the course to the left, the left and right excavation blocks 9 and 11 are both leftward and excavated.
[0017]
Furthermore, when it is necessary to widen the tunnel width during the excavation, as shown in FIG. 9, the left and right excavation blocks 9 and 11 are excavated while moving in the left and right directions, and the left and right construction blocks 13 and 15 are widened. When proceeding to a possible point, the left and right building blocks 13 and 15 are widened. FIG. 9 shows a state where the left and right excavation blocks 9 and 11 and the left and right construction blocks 13 and 15 are both widened.
[0018]
As described above, according to the present embodiment, the shield excavator can be rolled or turned by simply moving the left and right excavation blocks 9 and 11 along the convex curved surface of the main body block 3 in the vertical and horizontal directions. Or can be further widened. In addition, the mechanism for moving the left and right excavation blocks 9 and 11 is very simple, and the space in the machine can be used effectively.
[0019]
Moreover, since the left and right excavation blocks 9 and 11 and the left and right construction blocks 13 and 15 can be widened independently, when the shield machine 1 is widened, at least a distance that can widen the left and right excavation blocks 9 and 11 is copied. If the excavation is performed while excavating with the cutter, then only the left and right excavation blocks 9 and 11 can be widened and the excavation mechanisms 5 and 7 can excavate while excavating, so that the widening operation can be performed efficiently.
[0020]
In the above-described embodiment, the jack has been described as an example of the driving device for moving the left and right excavation blocks 9 and 11, but it goes without saying that other existing driving devices can be used.
[0021]
【The invention's effect】
As described above in detail, in the present invention, a convex curved surface that curves in the horizontal direction and the vertical direction is formed at the front end of the main body block, and a concave curved surface that follows the convex curved surface is formed at the rear end of the plurality of excavation blocks. Since the plurality of excavation blocks are movably connected to the front of the main body block along the convex curved surface with the concave curved surface opposed to the convex curved surface, the plurality of excavation blocks are moved up and down individually. It can move in the left-right direction, and the functions of rolling, turning, and widening can be exhibited by moving these excavation blocks.
Moreover, in this invention, since it is the structure which receives the digging resistance received from a front surface via a digging block with a convex curve, it receives the said resistance shown in FIG. 11 with what is called a middle folding jack installed in the bending part (middle folding part). There is no need to install a large number of middle-folded jacks as in the case of a thing, and the space in the machine can be widened.
[0022]
Further, since the main body block includes a plurality of tunnel construction blocks that can be widened in the width direction, tunnels having different cross-sectional areas can be constructed corresponding to the widening of the excavation block.
[Brief description of the drawings]
FIG. 1 is a perspective view of a shield machine according to an embodiment of the present invention.
FIG. 2 is a perspective view of the main body block 3 shown in FIG.
FIG. 3 is a horizontal sectional view of FIG. 1;
4 is an enlarged view of a portion C indicated by a circle in FIG.
FIG. 5 is a cross-sectional view of the shield machine shown in FIG.
FIG. 6 is an explanatory diagram of a rolling operation according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram of a vertical turning operation according to an embodiment of the present invention.
FIG. 8 is an explanatory diagram of a lateral turning operation according to an embodiment of the present invention.
FIG. 9 is an explanatory diagram of a widening operation according to an embodiment of the present invention.
FIG. 10 is a plan sectional view of a conventional multiple shield machine having a widening mechanism.
FIG. 11 is an explanatory view of a conventional multiple shield machine having a middle folding mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield machine 3 Main body block 3a Convex curved surface 5,7 Excavation mechanism 9 Left excavation block 11 Right excavation block 9a, 11a Concave surface 13 Left construction block 15 Right construction block 27a, 27b, 29a, 29b, 31a, 31b, 33a, 33b jack

Claims (2)

A main body block having a tunnel construction part on the rear end side and formed with a convex curved surface that curves in the horizontal direction and the vertical direction at the front end;
A concave curved surface is formed at the front end side along the convex curved surface, and a concave curved surface is formed at the rear end along the convex curved surface in front of the main body block with the concave curved surface disposed opposite the convex curved surface. A shield machine having a plurality of excavating blocks connected to each other. The shield machine according to claim 1, wherein the main body block includes a plurality of tunnel building blocks that can be widened in the width direction.

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