JPH0349192Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a shield type cylindrical tunnel boring machine.

[Conventional technology and problems]

In general, shield type cylindrical tunnel excavators as shown in Figs.
It is known from the publication No. This type of tunnel excavation machine includes a cutter disk 2 having a large number of roller cutters 1 on the front, a front shield 3 having an anchor device rotatably driving the cutter disk 2 on the front, and a rear part of the front shield 3. The intermediate cylinder 4 is inserted into the intermediate cylinder 4, and the rear shield 5 has an anchor device whose front end is bendably connected to the rear end of the intermediate cylinder 4. The front shield 3 and the rear shield 5 are connected by a plurality of propulsion jacks 6. They are connected.

Then, as shown in Figure 6 a, b, c, and d,
With the rear shield 5 fixed to the tunnel using an anchor device, the front shield 3 is propelled by a propulsion jack 6 using the intermediate body 4 as a guide to excavate the ground for a predetermined length, and then this front shield 3 is fixed to the tunnel using the anchor device. In addition to fixing it in the mine shaft, the rear shield 5
, and pull the rear shield 5 forward together with the intermediate trunk 4 while reducing the propulsion jack 6.
After fixing the rear shield 5 with the anchor device again, the front shield 3 is released and the above-mentioned operation is repeated again, that is, the excavation is propelled by the expansion and contraction of the shield structure.

Such conventional machines have all shields, i.e.
Since the front shield 3, intermediate shell 4, and rear shield 5 are cylindrical, excavation debris accumulates at the bottom of these shields, as shown in FIGS. Replacement may not be possible. This is especially noticeable when the ground is soft and prone to collapse.
As the reaction force of the anchor device becomes smaller, the inability to reload becomes increasingly difficult.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and it solves the problems of the conventional technology by simple and rational means, and forms a notch in the lower part of the cylindrical shield that constitutes the outer shell structure. By doing this,
At least, it is an object of the present invention to provide a tunnel excavator that can smoothly replace the shield that is drawn toward the front shield, and that can improve tunnel excavation propulsion efficiency.

[Structure of the idea]

The structure of the present invention that solves the problems of the conventional technology is as follows:
It consists of a cutter disk with many roller cutters on the front and an outer shell structure consisting of multiple cylindrical shields, and the front shield and rear shield, which have an anchor device and make up the outer shell structure, are connected by a propulsion device. However, in a shield type cylindrical tunnel excavation machine in which excavation propulsion is performed by the expansion and contraction movement of the outer shell structure, all the cylindrical shields constituting the outer shell structure or other than the front shield It is characterized in that a notch is formed in the lower part of the cylindrical shield.

〔Example〕

The details of the embodiments will be explained with reference to the drawings.

FIG. 1 is a longitudinal side view, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. 1.

A cutter disk 11 is provided with a large number of roller cutters 12, and the cutter disk 11 is rotatably attached to the front of a cylindrical front shield 13 constituting the outer shell structure. 1 in the diagram
4 is a motor for driving the cutter disk 11 rotations.

An intermediate barrel 15 is slidably and rigidly connected to the rear inner side of the front shield 13 by a key structure (not shown), and furthermore, an intermediate barrel 15 is slidably and rigidly connected to the rear inner side of the front shield 13 through a folded seal 16. shield 1
The front ends of 7 are connected in a bendable manner. and,
The front shield 13 and the rear shield 17 are:
They are connected by a plurality of propulsion jacks (propulsion devices) 18 provided at equal intervals, and the front and rear shields 13 and 17 are provided with anchor devices 19 and 20, respectively, and are independent of each other. Each shield is fixed to the shaft wall. The anchor devices 19, 20 and the propulsion jack (propulsion device) 18 cause the outer shell structure to expand and contract, thereby promoting excavation.

In the tunnel excavator configured in this way, the present invention provides the front shield 13, the intermediate trunk 1
5. All of the rear shield 17, or the intermediate torso 15 excluding the front shield 13, and the rear shield 17
A notch 21 having a bowstring-shaped front view is formed in the lower part of the holder.

It goes without saying that the notch 21 may have any shape as long as there is a notch at the bottom, such as a crescent shape in front.

〔effect〕

As described above, according to the configuration of the present invention, the following effects can be obtained.

(a) Even if the excavation waste generated by the excavation of the ground accumulates at the bottom of the outer shell structure, there is a notch at the bottom of the shield, so it is not possible to replace the shield with the excavation waste as in the past. There is no hindrance to the tunneling process, and the changeover can be carried out smoothly, improving the efficiency of tunnel excavation.

(b) The structure for obtaining the above effects is simple.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional view taken along line B-B in Fig. 1, and Fig. 4 is a longitudinal side view of the conventional example. 5 are sectional views taken along the line C--C in FIG. 4, and FIGS. 6 a, b, c, and d are flow explanatory diagrams showing the same excavation process. 11... Cutter disk, 12... Roller cutter, 13... Front shield, 14... Motor,
15... Intermediate body, 16... Half-fold sticker, 17...
Rear shield, 18... Propulsion jack (propulsion device), 19, 20... Anchor device, 21... Notch.

Claims (1)

[Claims for Utility Model Registration] a. A front shield consisting of a cutter disk having a large number of roller cutters on the front side and an outer shell structure consisting of a plurality of cylindrical shields, and having an anchor device constituting the outer shell structure. In a shield type cylindrical tunnel excavator which is connected to the rear shield by a propulsion device and excavation is propelled by the expansion and contraction movement of the outer shell structure, b. A shield type cylindrical tunnel excavator characterized in that a notch is formed in the lower part of a cylindrical shield other than a front shield or a cylindrical shield other than a front shield.