JPS58595A - Shield 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] The present invention relates to a shield tunneling machine.

In the excavation method using a shield excavator, as the excavation diameter becomes larger, the dynamic effects of excavation and the increase in the amount of excavated soil taken in increase. 4) occurs.

Therefore, when using a shield excavator with a large outer diameter,
There was a big problem: ensuring the safety of the ground.

The present invention has been made in view of the above problems, and its purpose is to divide the pressure chamber formed in the curved part of the shield tunneling machine body into a plurality of parts concentrically with respect to the rotation axis of the cutter head. Therefore, it is necessary to reduce the loose parts of the ground.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Second
In the figures and Fig. 3, (1) is the main body of the shield excavator (
Hereinafter, the cutter head (hereinafter simply referred to as the main body) is rotatably provided at the front end of the cutter head.

The pressure chamber formed immediately behind the cutter head (!) at the front of the main body (1) is concentric with the rotational axis of the cutter head (2) and its rotation support frame (4). The cutter head (2) is divided into two parts, an inner pressure chamber (3A) and an outer pressure chamber (3B), and the cutter head (2) has a chamber for taking in excavated soil corresponding to each of these pressure chambers (3AX3B). Surin) (SAX5B) are provided alternately on all four sides. Of the rotation support frame (4), Jj
(4a) KFi inner pressure chamber (Smu) for stirring the excavated earth and sand @ (6A), and its outer wall (4b) KFi outer pressure chamber (3B) OII 11! A plurality of stirring blades (6B) for stirring the soil test are provided. In addition,
The rotation support frame (4) is attached to the main body (1) via a bearing (
is supported by the cutter head (the opposite end K).
It is interlocked and connected to the rotary drive device (8) via the R-shaped wheel (7). (9A) is a screw conveyor-type earth removal system that discharges the excavated earth and sand in the inner pressure chamber (3A) to the atmospheric pressure chamber αOK, and (9B) shows the excavated earth and sand in the outer pressure chamber (3B) to the atmospheric pressure chamber 00. The Scrinik Compare soil removal device (IIAXIIB) that discharges the soil is the same drive device. (12
A) is a lubricated injection pipe for injecting a lubricating material into the inner pressure chamber (3A), and (12B) is a lubricating injection pipe for injecting a lubricating material into the outer pressure chamber (3B). . Note that (to) is the propulsion jack.

According to the above configuration, the plasticized excavated soil in the outer pressure chamber (3B) corresponding to the rocky area that is prone to collapse is supplied with a slippery material with a high specific gravity such as mud through the injection pipe (12B) with a slippery property. By injecting the material and stirring it by the stirring blade (6B), the outer pressure chamber (3B) can be filled with the excavated soil, so that the collapsed soil of the corresponding face of the outer pressure chamber (3B) Effectively color with support. Like a rock, it is supported by the excavated earth and sand in the outer pressure chamber (3B), which is the collapse earth pressure of the face.
As shown in FIG. 4, when the loosened portion of the ground is small, the overall slack curve (C) becomes smaller. Furthermore, the rotational resistance of the ivy head (2) can be reduced by plasticizing and injecting the lubricating material into the excavated soil. In addition, since the pressure chamber is divided into multiple parts, the cutter head (
The opening width and number of the slits (5 mm) (SB) to be provided are determined for each pressure chamber (3A) (3B) K! It can be changed by 5 times. Note that the inner pressure chamber (3A) has a small volume, which is advantageous against collapse of the face, and the amount of excavated soil taken in is also small, so the amount of lubricating material injected can be reduced. 9. If the pressure chamber is not divided, there is a drawback that the rotational force of the cutter head increases due to agitation due to the large amount of excavated soil that is taken in. However, if the pressure chamber is divided into circles as described above, such a disadvantage does not occur. There is no.

In the above embodiment, a screw conveyor is used as the soil removal device, but a method using slurry transportation may be used. When feeding slurry #, muddy water with a small specific gravity is supplied to the inner pressure chamber and muddy water with a large specific gravity is supplied under pressure to the outer pressure chamber to maintain the face. In addition, muddy water with low specific gravity is pressurized in the inner pressure chamber and mixed with excavated soil and stirred.
It can also be pressurized and supplied to the outer pressure chamber as muddy water with a high specific gravity. Further, in the above embodiment, the pressure chamber K is explained as being divided into two, but the pressure chamber may be divided into 3' or more.

Furthermore, in the above embodiment, the cutter spatula F was made flat, but as shown in FIGS. 5 and 6, the cutter head front end oIJ (b) of the inner pressure chamber (t4A) (1M) was As shown in FIGS. 7 and 8, the inner pressure chamber (111A) (19
A) may be configured so that the outer pressure chambers (IIIB) and (19B) are rotated separately, and furthermore, in the above 4, the cutter head may be tilted downward KN.

As described above, according to the shield tunneling machine of the present invention, since the pressure chamber is divided into a plurality of parts concentrically with respect to the rotation axis of the cutter head, it is possible to effectively support a face that easily collapses. Therefore, the part of the ground that is prone to collapse can be made smaller.

[Brief explanation of drawings]

Figure 1 is a drawing showing a loose part of the ground according to the conventional example;
Fig. 2 is an overall vertical cross-sectional view of the zero-fired 1J4o-embodiment, Fig. 3 is a half-plane view taken along the arrow I-I of the second cause, and Fig. 4 is a drawing showing the Kameyama slack portion according to the present invention. Figures 5 to 8 “
The figure is a vertical sectional view showing a modification of the pressure chamber. (1) - Shield tunneling machine main body, (phantom - cutter head, (
3A) - Inner pressure chamber, (3B) - Outer pressure chamber, (5A
X5B)...Slit, ozAXlxg) - Lubricating material injection pipe agent Yoshihiro Morimoto Figure 2) Figure 4 Figure U Figure 7 Figure 6 Figure U

Claims (1)

[Claims] , 1. A shield tunneling machine characterized in that a pressure chamber formed at the front of the shield tunneling machine main body is divided into a plurality of parts concentrically with respect to the rotational axis of a cutter head.