JPS62178693A - Shielding excavator - 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 Field of Application The present invention relates to the practice of shield drills for excavating tunnels having a cocoon-shaped cross-section.

2. Description of the Related Art Conventionally, when excavating a tunnel with a wide cross section, for example, a two-lane subway tunnel, as shown in Fig. Shave or according to Figure 9, J, Uni small II diameter tunnel 5
2 were being excavated in parallel. By the way, ttj on the front
When the diameter of the tunnel becomes smaller and the face becomes easier to break, the 21st stroke of the excavation bramble itself becomes higher.
Historically, there is a disadvantage that there is a lot of wasted space within the channel, and in the case of the latter, two separate shield excavators are required, resulting in an increase in running cost and an increase in the running cost.
There were vacancies such as RJ, which caused the period to be prolonged. As a way to eliminate this drawback, the cross-sectional shape of the tunnel is cylindrical. Line up two tunnels on the right side of the chisel, and make sure that the opposite sides are aligned at a specified width. , it can be seen that the shape of the eel is 5 and the shape of the eyebrow is 7J. By the way, the 10th Shield Red Junction 1 excavates a tunnel in the shape of a cocoon.
In the figure, as shown in i, the cross-sectional shape of the shield main body (As2) is made into a cocoon shape. It becomes necessary to write the form.

Problems that yh Ming is trying to solve As mentioned above, if the face plate of the cutter head is spoke-shaped, it will not be able to support the face sufficiently, especially if the ground is soft rock with high collapsibility. However, there was a problem in that a large amount of slurry was required.

Therefore, the purpose of the present invention is to solve the above problems and provide 1 to 7 shield excavation methods.

Means for Solving the Problem To solve the above problem W'j-J, the shield excavation method of the present invention includes at least two cylindrical shield bodies parallel to each other and with their opposite sides aligned. The shield main body has a cocoon-shaped cross section by connecting the parts so as to cover each other, and rotatably supports a rear cutter head having a circular face plate at the front end of one of the main shield parts, and a rear pressure chamber is provided behind the rear cutter head. A partition wall is provided, the front end of the other shield body extends forward from the rear cutter head, and a circular face plate is provided at the +"+Fi end of the other shield body.
1. Part of the cutter head is rotatably supported, and a front pressure chamber partition is provided at a position between the front cutter head and the rear cutter head.

Operation In the above configuration, by operating each cutter head and advancing the shield body by 11 u, a tunnel having a cocoon-shaped cross section is excavated. According to this configuration, at least two cutter heads are arranged at a distance of 5 centimeters in front and back, and the cutter head face plate is configured in a circular shape.
l! ! Even if there is a board C, the face can be supported for 1 minute.

EXAMPLE Hereinafter, an example of the present invention will be explained in detail with reference to the drawings. 1st
As shown in Figures 1 to 3, 1 is constructed by connecting two cylindrical shield main bodies 2 and 3 in parallel with each other, and in such a way that their opposing sides are partially overlapped. The main body of the shield has a cocoon-shaped cross section.

At one end of the shield main body 211 is a rear cutter head 5 having a circular face plate 4, and a holding cylinder 8 on which a rotary shaft 6 and a bearing (not shown) are mounted. A rear pressure partition wall 10 is rotatably supported through the rear pressure partition wall 10 and forms a completely circular rear pressure chamber 9 with the face plate 4 at the rear thereof. Moreover, the front end of the other shield main body part 3 is 1. A front cutter head 12 extends forward from the L rear cutter head 5 and has a circular face plate 11 at the front end of the other shield main body 3.
Thereafter, it is rotatably supported via a holding cylinder 15 to which a rotary shaft body 13 and a bearing 14 are attached, and is located at a position between the front cutter head 12 and the rear cutter head 5. A front pressure chamber partition wall 17 is provided which forms a completely circular front pressure chamber 1G with the face plate 11 of the front cutter head 12. J3.18 is each pressure chamber 19
．． 19, 2 (+
is a motor (electric or curved) that rotates each cutter head 5, 12, and drives a ring gear 21 fixed to the rear end of each rotary shaft body 6゜13 via a vinyl delta ring 22. That's what I'm doing. Moreover, when a plurality of slits 23 for taking in one sand are formed in a QJ shape in each of the face plates 4.11, one side of each slit 23 has cutter pits 1 to 1.
24 are installed in large numbers. Incidentally, although only a portion is shown in the drawing, it is attached to the entire sulin] 23. Reference numeral 25 denotes an opening/closing plate for a slit 23 which is freely inserted through a cylinder device 26 at a suitable location on each pressure chamber partition wall 10.17 and supports the face when the operation is stopped. Further, a mud feeding pipe 27 is connected to the upper center of each pressure chamber partition wall 10.17, and a mud draining pipe 28 is connected to the lower center. In addition, 29 is a propulsion jig arranged in large numbers on the inner periphery of the rear part of the shield body 1 ↑
- Numeral 30 is a lock for entry and exit of work 0 provided on the pressure chamber bulkhead 10.17.

When using the above configuration to excavate a tunnel having a cocoon-shaped cross section, the cutter heads 5 and 12 are rotated 8 times by the respective motors 19 and 20 to perform the excavation.

At this time, slurry is injected into each pressure chamber 9.16 from the mud feeding pipe 27 to support the face, and the excavated one
-Sand is discharged from (IA pipe 28).

Further, when the operation is stopped, the opening/closing plate 25 of the sulin 1-23 is protruded to support the face.

In J3, the pressure chambers 9 and 16 are separated from each other on the left and right sides, but completely circular, so that, for example, as shown in FIGS. 4 and 5, the cocoon-shaped loaf J chamber 31 When configured, the end surface 3 of the shield main body portion 32 protruding forward
2a can be prevented from becoming weaker in strength.

In the above embodiment, two cylindrical shield main bodies are arranged side by side in the horizontal direction, but they may also be arranged in parallel in the vertical direction, for example, as shown in FIGS. 6 and 7. Three cylindrical shield body parts 41, 42 degrees 43 may be arranged in parallel in the horizontal direction (or vertical direction). In this case, for example, the central cylindrical shield main body portion 42 is projected forward.

Furthermore, it is also possible to arrange four or more cylindrical shield main bodies in parallel.

Advantages of the Invention According to the configuration of the present invention, it is possible to excavate a tunnel with a cocoon-shaped cross section, so it is possible to excavate a circular tunnel in 2 fl! IJ1
．． Compared to the case of digging 4 holes, the overall tunnel width is narrower, which is advantageous in terms of securing land, and the amount of excavation is also reduced in 1) 4, which makes it more economical. Become. In addition, out of at least two cutter heads, one is placed in the front and the other in the rear, and the face plate of each cutter head is formed into a circular 41z shape, so even if the other mountain is on soft ground with high collapsibility, The face can be supported in +B). Further, since a pressure chamber is provided for each cutter head, it is possible to prevent the front end of the other shield main rest portion protruding from behind the shield main body from becoming weak in strength. Furthermore, since the left and right pressure chambers are installed independently, if the ground quality differs between the left and right, it must be dealt with separately and This also helps the direction side 6I of the shield body.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention.
The figure is a horizontal sectional view, Figure 2 is a view from the 1-■ arrow in Figure 1, and Figure 3 is a horizontal sectional view.
The figure is a view from the ■-■ arrow of Fig. 1, Fig. 4 is a schematic plan view for explaining defects, Fig. 5 is a view from the Figure 6 is a horizontal sectional view, Figure 7 is a front view, Figures 8 to 10 show conventional examples, and Figures 8 and 9 are cross-sectional views of the tunnel. Fig. 10 is a front view of the cocoon-shaped shield tunneling machine. 1... Shield main body, 2, 3... Cylindrical shield main body part, 4, 11... Face plate, 5... Rear cutter Head, 9... Rear pressure chamber, 10... Rear pressure chamber bulkhead, 1
2...Front cutter head, 16...Front pressure chamber, 1
7... Curved pressure chamber bulkhead agent Yoshihiro Morimoto Figure 1 Figure 2 Figure 3 Figure 4 Figure S Figure 2a Figure 4 Figure 7

Claims (1)

[Claims] 1. At least two cylindrical shield main bodies are connected in parallel with each other so that their opposing sides partially overlap to form a shield main body with a cocoon-shaped cross section, and a circular shape is attached to the front end of one of the shield main parts. A rear cutter head having a face plate is rotatably supported, a rear pressure chamber partition is provided at the rear of the rear cutter head, a front end of the other shield body extends forward from the rear cutter head, and the other shield body A shield tunneling machine, characterized in that a front cutter head having a circular face plate at its front end is rotatably supported, and a front pressure chamber partition is provided at a position between the front cutter head and the rear cutter head. .