JPS63201294A - Shield for excavating tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention provides a split-type tunnel excavation shield that allows the tunnel excavation plan alignment to adapt to horizontal, vertical, and curved changes when excavating a tunnel with the tunnel excavation shield. It is related to.

Conventional technology Conventional split shields for tunnel excavation, such as those with a structure such as the one published in Tokuko Sho 59-18513, connect split shields with a vertical axis with the same central axis, and the front and rear shields swing around this axis. When turning in the vertical direction, the direction was changed mainly by operating the upper and lower shield jacks.

For example, in Japanese Patent Publication No. 59-16639, an intermediate ring girder is installed between the front shield and the rear shield, and the front shield and the intermediate ring girder are connected by a vertical axis, and the rear shield and the intermediate ring girder are connected by a horizontal axis. When connected, the direction of the front shield can be changed in any direction, up, down, left, or right with respect to the rear shield.

Problems to be Solved by the Invention However, in the Japanese Patent Publication No. 59-18513, turning in the left and right direction became accurate and easy, but when turning in the vertical direction, operating the shield jack was troublesome. However, in this structure, the radius of curvature becomes large, and it is necessary to over-excavate the upper or lower part of the face, creating a large gap between the ground and the shield, which may induce ground subsidence. The structure of the Japanese Patent Publication No. 59-16639 has a mechanism that can move accurately and easily in all directions, left, right, top, and bottom, but the structure is complicated, it lacks simplicity in manufacturing, and it requires a large amount of work during excavation work. This poses a problem because it lacks robustness during operation due to the force applied to it.

Means for Solving the Problem The present invention will be explained below with reference to the embodiments shown in the drawings.
The figure is a front view of the shield for tunnel excavation of the present invention taken along a vertical plane including the center axis of the shield, FIG. 2 is a cross-sectional view taken along the line ■-■ of FIG. 1, and FIG. This is a top view of a horizontal vertical section including the center axis of the shield. As shown in these drawings, the shield l for tunnel excavation of the present invention is divided into a front shield 2 and a rear shield 3, and the rear shield 3 The front end of the spherical skin plate 4
This part and the shield vertical diameter line yW of the skin plate part 5 provided with the sealing material at the rear end of the front shield 2 have a spherical axis 6°7, and the upper spherical axis 6 and the front shield 2, and the spherical shaft hole 8 at the tip of the connecting bearing 9 fixed to the upper rear end of the shield 2 is fitted into the spherical shaft hole 8, and the spherical shaft 7 at the lower front end of the rear shield has one end rotated to the lower part of the front shield 2. The front shield 2 and the rear shield 3 are connected by fitting into a spherical shaft hole 12 provided at the tip of the piston rod 11 of the freely attached front shield upper and lower jack lO.

In this case, the positions of the upper connection bearing 9 and the lower jack IO are exchanged, and the jack IO is placed on the top of the front shield 2.
Even if the connecting bearing 9 is provided at the lower part of the front shield 2, or if both are mounted, the invention remains the same.

Further, between the front shield 2 and the rear shield 3, as shown in FIG. 3, FIG. 1, and FIG. 2, there are steering jacks 13 and 14 on the left and right sides thereof. The ends of the cylinders are rotatably mounted on support arms 15, 16 provided on the front shield 2, and the piston rods 17, 18 of these jacks are respectively attached to supports 19, 20 on the rear shield 3. It is rotatably mounted. A plurality of these steering jacks may be installed on the left and right sides.

Also, between the front shield 2 and the rear shield 3, there are fixing devices 21, 22.2 (near the inner side of the steering jacks 13, 14 provided on the left and right parts of the shield and the upper and lower jacks 10 located at the bottom). These fixing devices are respectively provided near the inner side, and in this embodiment, the structure of these fixing devices is the holders 25 and 26 provided on the ring beam 24 of the front shield.
．． Fixing rods 32, 33, 34 are provided to define the length by penetrating between the ring beam 27 and the receivers 29, 30, 31 provided on the ring beam 28 of the rear shield, respectively. A plurality of these fixing devices may be provided in each part if necessary.

Further, on the circumference of the front ring 35 of the front shield 2, there are shield jacks 36 a, 36 b, 36 c, 36 d-.
The ends of the cylinders are mounted at regular intervals, and spreaders 37a and 37b are connected to the tips of the piston rods of these jacks via spherical joints, respectively.

37c, 37d, . . . are provided, and are brought into contact with the side surfaces of the segments 38 by means of these spreaders.

Function Next, to explain this function, Fig. 3 is a state diagram when this shield is moved straight, Fig. 4 is a state diagram when the shield shown in Fig. 1 is curved upward, and Fig. 5 is a state diagram when the shield is moved upward. This is a state diagram when the shield shown in the figure is moved to the left (downward in the drawing), but since the shield of this invention has the structure described above, when it is moved straight, it is shown in Fig. 3. The front shield 2 and the rear shield 3 are fixed by the fixing devices 21, 22, and 23 in such a state that the central axes a and b of the front shield 2 and the rear shield 3 are aligned, and the shield jacks 36a, 36 b, 36 c, 36 d- are extended and spreaders 37 a, 37 b, 37 c, 37 d-
By pressing segment 38, you can propel the shield straight.

If you want to move the shield upward, loosen all the fixing devices 21, 22, 23, release the pressure from the left and right steering jacks 13, 14, and then tighten the vertical jack at the bottom of the shield as shown in Figure 4. Rotate to the front shield 2
The central axis a of the rear shield 3 is at an angle θ1
In this state, the shield jack 36
a, 36 b, 36 c.

By extending 36d..., the shield can be propelled upward. In this state, all fixing devices 2+, 2
If 2.23 is fixed, this direction will be fixed and it will always curve upward at this angle. When propelling the shield downward, the shield can be propelled downward by reducing the vertical jack IO in the opposite direction to the above operation.

If you want to move the shield to the left, that is, downward in FIG. 5, loosen the fixing devices 21, 22, 23, extend the steering jack 14 on the right side, that is, on the upper side in FIG. That is, if the steering jack 13 at the bottom of the figure is reduced, it will be displaced below the front shield surface, and in this state the shield jacks 36a, 36b, 36c, 36d, etc.
By extending the shield, the shield can be moved to the left (downward in the drawing). Once the direction is determined, the fixing devices 21, 22.
By fixing 23, the shield can be moved leftward at a constant angle. If you want the vehicle to turn right, you can do so by operating the steering jack in the opposite direction.

Furthermore, if the above-mentioned up/down and left/right direction changing operations are performed in combination at the same time, the direction can be freely changed in all directions, up, down, left and right.

As described in detail, with the shield of the present invention, excavation work can be carried out by turning in the vertical direction with a simple operation, and there is no need for large over-excavation, and it is possible to proceed with excavation work. It is possible to work safely without weakening the mountain ground, the simple structure allows the course to be changed in any direction, up, down, left or right, and there are no complicated components, making it easy to manufacture, especially during work. It is robust and capable of carrying out curved excavation work reliably and without any problems, even against the enormous loads imposed on the machine.

[Brief explanation of the drawing]

FIG. 1 is a front view of the shield for tunnel excavation of the present invention taken along a vertical plane including the shield center axis;
The figure is a sectional view taken along the ■-■ line in Figure 1, and Figure 3 is the one in Figure 1.
Figure 4 is a top view of a horizontal vertical section including the shield center axis; Figure 4 is a front view taken in a vertical plane including the shield center axis when the front shield is bent upward; Figure 5 is a front view of the front shield folded to the left. FIG. 7 is a top view taken longitudinally along a horizontal plane including the shield center axis when the shield is bent. In the figure, 1 is a shield for tunnel excavation, 2 is a front shield, 3 is a rear shield, 6.7 is a spherical shaft, 9 is a connecting bearing,
10 is a vertical jack, 13.14 is a steering jack, 21, 22.23 is a fixing device, 36 a, 36
b, 36 c, 36d... are shield jacks, 37
a, 37 b, 37 c, 37 d, . . . - are spreaders, and 38 is a segment.

Claims (1)

[Claims] The shield of the shield for tunnel excavation is divided into a front part and a rear part, and spherical shafts 6 and 7 are provided at the upper and lower parts of the front end of the rear shield 3 so that a line passing through the centers of these spherical surfaces coincides with the diameter line of the shield. , fitting the upper spherical shaft 6 and the spherical shaft hole 8 of the connection bearing 9 fixed to the upper rear end of the front shield 2;
The front shield 2 is assembled by fitting the spherical shaft 7 at the bottom of the rear shield with the spherical shaft hole 12 provided at the tip of the piston rod 11 of the vertical jack 10 whose one end is rotatably attached to the bottom of the front shield 2. and a rear shield 3, and the left and right parts of the rear part of the front shield 2 and the front part of the rear shield 3 are connected by steering jacks 13 and 14, respectively.