JPH02304197A - Shaft jointly excavating type shield excavator - Google Patents

Abstract

PURPOSE:To shorten construction period, and to reduce cost by providing a frame of triple structure consisting of outside, intermediate, and inside members, and by successively separating them as excavation proceeds, so that one set of machine can be jointly used for the construction work from a shaft to a final tunnel. CONSTITUTION:An outside frame 1, an intermediate frame 2, and an inside frame 3 are made of triple structure being slidable in the axial direction to each other and separable from each other. To the inside frame 3, a cutter 9 provided with a cutter spoke 13 being expandable in the radial direction is rotatably retained. After a shaft 17 has been excavated by the caisson method to a prescribed depth, the outside frame 1 is separated. Next, after a curved tunnel 18 has been excavated by the propulsion method, the intermediate frame 2 is separated. And then, a final tunnel 19 is excavated by the shield method while driving the inside frame 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shaft excavation combined type shield tunneling machine that is capable of excavating a shaft and a tunnel using one tunneling machine.

[Prior Art] When constructing a tunnel, conventionally, as shown in an example in FIG. An excavator C is used to excavate a redundnel b.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned conventional method, if the shaft a is deep, it is difficult to insert the shield tunneling machine C, and the excavation of the shaft a and the tunnel b are difficult. There was a problem in that separate machines had to be prepared for this purpose, which increased costs.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a shield tunneling machine that can be used for both shaft excavation and tunnel excavation, which can be used in combination from shaft excavation to final tunnel excavation with one machine.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a three-fold structure in which an outer frame, an intermediate frame, and an inner frame are slidable in the axial direction and can be separated from each other. Provided as a structure,
Further, the inner frame rotatably supports a cutter having cutter spokes that are expandable and retractable in the radial direction.

[Operation] When constructing a tunnel, first construct a vertical shaft to a specified depth using the caisson double method, then cut off the outer frame and construct a curved tunnel using the propulsion method, and then remove the intermediate frame. The final tunnel will be constructed by separating the tunnel and excavating the inner room using the shield method.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the shaft excavation type shield tunneling machine of the present invention includes a cylindrical outer frame 1 that serves as a shield frame during shaft construction, and a ring-shaped inner frame 3 that serves as a shield frame during final tunnel construction. and a ring-shaped intermediate frame 2 that will serve as a shield frame during construction of a curved tunnel between the shaft and the final tunnel.
The outer frame 1 has a load receiving structure 5 that extends toward the rear end surface of the intermediate frame 2. The load-receiving structure 5 and the rear end surface of the intermediate frame 2 are removably fixed to each other by pins or pins, and the inner frame 3 is attached to the intermediate frame 2.
A load receiving structure 6 extending toward the rear end surface is provided, and the load receiving structure 6 and the rear end surface of the inner frame 3 are removably fixed with bolts or pins, and the front surface acting on the inner frame 3 is provided. The thrust load from the side is sequentially transferred to the intermediate frame 2,
so that it can be transmitted to the outer frame 1.

The inner side of the outer frame 1 is equipped with a propulsion jack 7 used when constructing a curved tunnel and a segment assembly device 8 for the curved tunnel construction section. A cutter 9 disposed in a section is rotatably supported via a cutter bearing 10 and a cutter seal 11, and a cutter driving motor 12 is installed to drive the cutter 9. The cutter 9 has an outer diameter corresponding to that of the inner frame 3, and can be extended radially from the outer periphery to a position corresponding to the outer diameter of the outer frame 1 by operating a telescopic device 23 such as a lever. Furthermore, on the outer periphery of the rear end surface of the inner frame 3, there is a girder part 1 equipped with a shield jack 14, which is carried in the divided state and assembled at the time of final tunnel excavation.
5 and the sole part 16 which becomes the segment assembly part can be attached.

When constructing a tunnel, first cutter spoke 13
is extended from the outer periphery of the cutter 9 to a position corresponding to the outer diameter of the outer frame 1, and in this state, the second
As shown in the figure, the excavator is placed so that the cutter 9 faces downward, and while excavating by driving the cutter 9, the shaft 17 is constructed to a predetermined depth using the caisson construction method. At this time, the propulsion force is applied to the outer frame 1 by a source pushing device (not shown) installed at the top of the shaft 17.

Next, the excavator starts a curved construction in order to change direction from vertical to horizontal, but before that, the cutter spoke 13, which has been extended to a position corresponding to the outer diameter of the outer frame 1, is moved by the operation of the expansion device 23. It is shrunk to a position corresponding to the outer diameter of the intermediate frame 2. Also, at this point, the outer frame 1
The mechanical connection between the load receiving structure 5 and the intermediate frame 2 is released, and the edge between the outer frame 1 and the intermediate frame 2 is cut. In this state, a curved tunnel 18 is formed using the propulsion method.
construction. That is, the tapered segment 2 for curved construction is assembled by the segment assembly device 8 within the outer frame 1.
0 is assembled and set on the rear end surface of the intermediate frame 2.

Thereafter, excavation is performed with the cutter 9 while applying a pushing force to the tapered segment 20 with the propulsion jack 7.

In this case, since the outer frame 1 and the intermediate frame 2 have a cut edge as described above, the intermediate frame 2 is pushed out from the outer frame 1 together with the cutter 9. When the length of one ring of the tapered segment 20 has been pushed, the next tapered segment 20 is assembled and fixed at the rear of the tapered segment 20, and the medium frame 2 is similarly propelled. By repeating this operation a predetermined number of times, curved channels 1 to 18 are constructed as shown in FIG.

When the direction change is completed, the girder part 15 and the tail part 1, which were carried in parts, are placed on the outer periphery of the rear end surface of the inner frame 3.
6 and attach it to the original shield form.

At this time, the cutter spokes 13 are contracted to correspond to the outer diameter of the inner frame 3, and
The mechanical connection between the intermediate frame 2 and the inner frame 3 is released, and the edge between the intermediate frame 2 and the inner frame 3 is cut. In such a situation,
The tunnel 19 is constructed by advancing the inner frame 3 by the shield construction method and sequentially installing the segments 21 as shown in FIG. A propulsion reaction force receiving structure 22 is installed in advance in the curved tunnel 18 that has already been constructed, and the inner frame 3 is excavated so that the structure 22 receives the reaction force of the shield jack 14. The segments 21 are installed one after another, and after the construction of channels 1 to 19 is completed, the structure 22 is removed.

In this way, by separating the outer frame 1 and the intermediate frame 2 for each construction method, it is possible to easily construct a tunnel with one excavator.

In addition, although the earth removal method is not mentioned in the above embodiment, the earth removal method may be a fluid transport method or a conveyor earth removal method, and as a shield model, a mud water type, an earth pressure type, etc. may be adopted. Moreover, methods other than those shown and described may be used for connecting and separating the frames, and it goes without saying that various changes can be made without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the shield excavator combined with shaft excavation of the present invention, the triple-structured outer frame, intermediate frame, and inner frame can be successively separated as the excavation progresses. Therefore, the excavation work from shaft construction to final tunnel construction can be performed as a series of operations.
This eliminates the need for the conventional work of inserting an excavator into the shaft, shortens the construction period and improves the economic effect, especially in the case of deep, large-diameter shafts. Since there is no need to prepare a separate machine for excavation, the manufacturing cost of the entire machine can be reduced compared to conventional methods, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing an outline of an embodiment of the shield tunneling machine combined with vertical shaft excavation of the present invention, and FIGS. 2 to 4 show tunnel construction work using the shield tunneling machine of the present invention. FIG. 5 is a schematic diagram showing the procedure for conventional tunnel construction. 1... Outer frame, 2... Middle frame, 3...
・Inner frame, 5, 6...Load receiving structure, 7...
Propulsion jack, 8... Segment assembly device, 9...
Cutter, 12... Cutter drive motor, 13...
・Cutter spoke, 23...Expansion device.

Claims (1)

[Claims] (1) A cutter having a triple structure in which an outer frame, an intermediate frame, and an inner frame are slidable in the axial direction and can be separated from each other, and the inner frame has cutter spokes that can be freely expanded and contracted in the radial direction. What is claimed is: 1. A shield excavator for combined shaft excavation, characterized in that it has a configuration in which a shaft is rotatably supported.