JPH0461159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shield machine used when constructing an underground shaft.

(Prior art) When building a horizontal shaft underground, a shield machine is generally used, but this type of shield machine is
For example, as shown in FIG. 5, a partition wall 2b' is formed on the shield tube 2'', and the partition wall 2b' completely seals the face chamber 3', and a center shaft 9' for driving the rotary cutter 7' is installed at the center of the partition wall 2b'. and partition wall 2
There is a so-called earth pressure type shield machine in which a screw conveyor 23' for earth and sand discharge is connected to b'.

In addition, as shown in FIG. 6, the shield tube 2
There are various types of shield machines, such as a hand-dug type shield machine, which opens toward the rear of the tunnel near the center of the bulkhead 2b'' formed in the front part of A', and is equipped with a belt conveyor 28' for discharging earth and sand.

However, conventionally, in the above-mentioned shield machines, the shield tubes 2'' and 2A' are formed by processing steel plates, and the shield tubes 2'' and 2A' are designed to resist the thrust of the shield jack and the earth pressure of the ground. Since it is designed to withstand water pressure, etc., it is necessary to process and use a large amount of steel. For this reason, manufacturing a shield machine requires a large amount of time and money. In particular, large-diameter mechanical shields for underground railways and automobile tunnels use extremely large amounts of steel, and require a large amount of can manufacturing and machining, which requires a great deal of effort to manufacture these parts. This method requires time, and therefore has the disadvantage that it takes a long time to manufacture the shield machine.

(Object of the Invention) The present invention has been proposed in view of the above points, and its purpose is to use reinforced concrete or steel-framed concrete to avoid using steel materials as much as possible when manufacturing a shield machine, and to construct a shield tube by using reinforced concrete or steel frame concrete. It is an object of the present invention to provide a closed type shield machine which can be easily manufactured in a short period of time and without requiring a large amount of cost by forming it with a concrete structure.

(Structure of the Invention) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figures 1A and 1B show an example of a so-called earth pressure sealed mechanical shield machine, which has a rotary cutter on the front, fills the face chamber with earth and sand that excavates the face, and presses the face with the earth pressure of the earth and sand. In this embodiment, the shield cylinder 2 of the shield machine main body 1 includes a hood part 2a formed at the front part, a partition wall 2b that separates the face chamber 3 on the face side from the mine shaft 4 side, and the outer periphery of this partition wall 2b. The shield tube 2 has a cylindrical outer shell 2c extending rearwardly, and is integrally formed with the shield tube 2. The shield tube 2 is characterized in that it is made of a reinforced concrete or steel frame concrete structure. In this case, in order to prevent wear caused by the earth and excavated earth and sand, the outside of the hood part 2a and the outer shell 2c of the shield tube 2, the blade opening parts such as the inside of the hood part 2a, and the front surface of the partition wall 2b are made of a relatively thin material. It is preferable to cover it with a steel plate 6, but if the ground is soft, it is not necessary to cover it with the steel plate 6. In this case, it goes without saying that formwork for pouring concrete must be assembled separately.

7 is a rotary cutter for excavating the ground provided in the front opening of the shield tube 2, that is, in front of the face chamber 3, and includes a center shaft 9 having a fishtail-shaped central bit 8 at the tip; Boss 1 provided at the tip of
The proximal end is connected to the shield tube 2, and the distal end is connected to the shield tube 2.
a plurality of cutter spokes 11 extending radially toward the outer periphery of the cutter spokes 11;
The center shaft 9 is equipped with a bit 12 provided on the front side of the partition wall 2b and a mixing blade 13 provided on the rear surface as required, and the center shaft 9 is provided with a support portion 14 provided in the center of the partition wall 2b and a frame 1 behind the partition wall 2b.
It is pivotally supported by penetrating from the face chamber 3 to the mine shaft 4 side through a support part 16 provided in the shaft 5, and rotation from a rotation transmission mechanism 18 consisting of a drive motor 17 and a reduction gear is transmitted and is configured to be rotatable in forward and reverse directions. ing. In addition, a hollow mud material injection pipe 9a is provided in the center shaft 9 as necessary, and along with this, a swivel joint 19 provided at the rear end of the center shaft 9 and an injection pipe connected thereto. It is possible to inject a muddying soil material such as a bentonite solution through the pipe 20, and this muddying soil material is formed at an injection port 9b formed at the tip of the center shaft 9 or at an appropriate location of the cutter spoke 11 as necessary. The excavated soil and the mud-making soil material which are ejected to the outside from the injection port (not shown) and taken into the face chamber 3 are mixed by the mixing blades 13 and converted into mud, and into this mud, A propulsion shield jack 22 provided between the rear part of the bulkhead 2b and the segment 21 on the face side is activated to generate earth pressure, thereby carrying out excavation while holding down the face. ing. Reference numeral 23 denotes a soil removal device for discharging the mud in the face chamber 3, which consists of a normal screw conveyor, and its tip is provided at the lower part of the partition wall 2b so as to communicate with the inside of the face chamber 3, and is filled with mud. As the shield machine main body 1 excavates, the mud inside is appropriately discharged.

Note that 2d is a flange portion formed on the inner periphery of the rear end of the outer shell 2c of the shield cylinder 2, 24 is a cylindrical tail plate made of a thin steel plate provided behind the flange portion, and 25 is a tail seal.

FIG. 2 shows a second embodiment of the present invention, and this embodiment is characterized in that the tail plate 24 of the first embodiment is integrally formed with the outer shell 2c from concrete. In this case, it is conceivable to make the thickness thicker than the steel plate in terms of strength, so the tail void will also become larger. Therefore, a backfilling pipe 26 may be provided inside the concrete tail plate 2c', and mortar or earth and sand may be backfilled and injected simultaneously with the excavation of the shield machine body 1. Other configurations and operations are similar to those of the first embodiment.

In the first and second embodiments, the shield cylinder of the earth pressure system shield is made of concrete, but it is of course applicable to a muddy water pressure shield.

3A and 3B show a third embodiment of the present invention, and this embodiment is characterized in that the shield tube 2 is formed by assembling previously formed divided pieces 2'.
That is, the hood part 2a of the shield cylinder 2, the partition wall 2
b and outer shell 2c are each made of an assembly of divided pieces 2' made of reinforced steel or steel-framed concrete. For example, in the field, each divided piece 2', 2' is connected to each other with bolts or PC steel, as shown in Fig. Fasteners such as sticks 2
The shield cylinder 2 and, by extension, the shield machine main body 1 are assembled by connecting and assembling the shield cylinder 2 using the parts 7. FIG. 4B shows an example of the unit segment 2', and each segment 2' has the following characteristics when assembled.
Of course, they are formed to correspond to the shapes of the hood portion 2a, partition wall 2b, outer shell 2c, etc. of the shield tube 2.

However, in this example, by pouring concrete in advance and allowing sufficient curing, it is possible to save on-site pouring and curing time, and it is easy to assemble with bolts, etc.
The time and cost required for assembly can be saved.

Although the tail plate 24 is made of steel, it can also be made of concrete. Further, the concrete used here may be concrete containing alumina, resin, etc., in addition to commonly used Portland cement, mixed cement, etc.

Other configurations and operations are similar to those of the previous embodiment,
Parts that absolutely need to be made of steel, such as the cutter, center shaft, drive motor, etc.
Shield jacks, screw conveyors, etc. will be made of steel plates as before.

In each of the above embodiments, for example, the outer shell 2c of the shield machine is assembled with precast members,
The partition wall 2b can also be installed on site.

(Effects of the Invention) As described above, according to the present invention, since the shield tube of the shield machine is made of a concrete structure,
The amount of steel used and the labor involved in processing the steel can be significantly reduced, making it easier to manufacture the shield machine body, and reducing the amount of expensive steel used, thereby reducing material costs. There is an advantage that an inexpensive shield machine can be obtained.

[Brief explanation of the drawing]

Figures 1A and 1B show a first embodiment of the shielding machine of the present invention, A is a longitudinal cross-sectional view, B is a sectional view taken along line A-A in Figure A, and Figure 2 is a second embodiment of the present invention. 3A and 3B show a third embodiment of the present invention, in which A is a longitudinal sectional view and B is a sectional view taken along the line B--B in FIG. In addition, Fig. 4A is an explanatory diagram for assembling a divided piece in a similar embodiment, B is an example of a divided piece, Fig. 5 is a conventional example of a mechanical shielding machine, and Fig. 6 is a conventional example of a manual shielding machine. It is. 1 , 1 A...Shield machine body, 2...Shield tube.

Claims (1)

[Claims] 1. A hood part 2a formed in the front part, a partition wall 2b that partitions the face chamber 3 on the face side and the mine 4 side,
The shield cylinder 2, which has an outer shell 2c extending to the rear of the outer periphery of the partition wall 2b, is made of a concrete structure, and a rotary cutter 7 for excavating the face is provided in the front part of the face chamber 3. The front part of the transmission member is connected, and the rear part thereof is connected to a rotation transmission mechanism 18 that includes a drive motor 17 provided on the side of the tunnel 4, and which is connected to the face chamber 3.
The front part of an earth removal device 23 for removing excavated earth taken into the partition wall 2 is connected to the partition wall 2.
Shield jack 2 for propulsion is located at the rear of the outer peripheral part of b.
2, and the rear tail portion of the shield tube 2 is made of steel or concrete structure.