JPH03233093A - Shield machine for excavation in sharp curve - Google Patents

Abstract

PURPOSE:To economize construction through shortened term of works by a method wherein a movable tail member is connected, being capable of expanding and contacting, to a shield machine main body through a jack that is bendable in the middle, and a girder member is structure in a way of being capable of expanding and contracting. CONSTITUTION:A movable tail member 5 is connected to a shield machine main body 1 through a jack 4 that is bendable in the middle, and an external barrel 5b of the tail member is made capable of sliding in reciprocation along an internal barrel 5a of the tail member. In excavation of a horizontal tunnel, driving is made with the external barrel 5b and the internal barrel 5a extended each other in telescopic structure. In excavation in a section with a sharp curve, the driving is made with the external barrel 5b retreated to the side of the internal barrel 5a, and segments 6 that are narrow in width are used therefore. A girder member 7 is made movable against the shield machine main body 1. In excavation in the section with a sharp curve, the driving is made with the girder member 7 and the movable tail member 5 contracted each other in telescopic structure. Thereby continuous construction of a vertical shaft, an inclined shaft and a main tunnel becomes possible.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a shield excavator for two curves.

(Prior Art) When constructing a conventional two-curve shield tunnel, it has been said that it is effective to use a hollow shield excavator with a shortened shield length.

Conventionally, there have been shield excavators that can bend in the middle, but there has never been a shield excavator that allows you to freely change the length of the machine.

(Problems to be Solved by the Invention) The amount of excess excavation in conventional sharply curved shield tunnels was largely due to the captain of the shield. This over-excavation portion not only increased the amount of excavated soil, but also caused collapse of the face, movement and deformation of the surrounding ground, and further caused a reduction in the ground reaction force for shield bending. In order to prevent these problems, auxiliary construction methods such as ground improvement are often required, which poses problems in terms of economic efficiency. The present invention was proposed in view of the problems of the prior art, and its purpose is to reduce the radius of curvature and reduce the amount of over-excavation in the construction of an elephant 1 curve using a shield excavator. The object of the present invention is to provide a sharp curve shield excavator that can continuously construct a vertical shaft and a main line shield tunnel.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a sharp curve shield excavator according to the present invention has a shield main body equipped with a rock excavation mechanism on the front side, which is connected via a bending jack. The movable tail portion is configured to be expandable and contractible.

In the invention of claim 2, the girder portion of the shield main body is configured to be expandable and contractible.

(Function) As described above, the shield excavator of the present invention has a movable tail connected to the shield main body via a center bending jack, which is extendable and retractable. Performs excavation work in the same manner as a shield excavator having a shield excavator, and when constructing a curved section h'*, the movable tail section is shortened to shorten the machine length of the nord excavator to enable construction of sharp curves, There are some methods that reduce the amount of excess excavation when constructing curves and curves, and also make it easier to secure ground reaction force.

The invention according to claim 2 is such that the girder part of the knold main body is also configured to be expandable and retractable, so that the length of the knold excavator can be further shortened when constructing a curved part, and construction of two curves can be made easier. There is.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In the embodiment shown in FIGS. 1 and 2, C1 (11 is a cutter face plate (2) or a cutter spoke on the front, a copy cutter and a drive mechanism thereof (none of which are shown)
(3) is a shield jack attached to the shield body (1).

A movable tail portion (5) is connected to the shield body (1) L through a bent jack (4), and the movable tail portion (5) is connected to an inner cylinder portion (5a) and an inner cylinder portion (5a). ), and the outer cylinder part (5b) is moved back and forth along the inner cylinder part (5a) by a telescoping mechanism (not shown), and the tail The portion (5) is configured to expand and contract.

In the figure (6) is the segment.

Since the illustrated embodiment is constructed as described above, when constructing a horizontal tunnel, as shown in FIG.
The outer cylinder part (5b) of the movable tail part (5) is connected to the inner cylinder part (5).
a) and performs the same work as a conventional shield excavator.

Next, when constructing a sharp curve, as shown in FIG.
) side, reduce the movable tail part (5), shorten the length of the shield excavator, and excavate sharp curves.

In this state, a narrower segment (6) than a normal segment is used.

According to the embodiment described above, only when constructing curved sections, the length of the shield excavator can be shortened to improve the working capacity when constructing steep curves, reduce the amount of excess excavation, and make it easier to secure ground reaction force, which is better than conventional methods. As shown in , it is possible to reduce the number of auxiliary construction methods for ground reinforcement, and the overall construction period for tunnel construction can be shortened.

In addition, as mentioned above, it is now possible to construct 9 curves, and it is now possible to construct vertical shafts, inclined shafts, and main tunnels at the same time. No longer necessary, shortening the construction period,
Construction costs will be saved.

3 and 4 show another embodiment of the present invention, in which the movable tail portion (5) is configured to be extendable and retractable in the same manner as in the previous embodiment, and the girder portion of the shield body (1) is The movable girder part (7) is slidably fitted to 1), and the movable girder part (7) and movable tail part (5) are extended as shown in Fig. 3 when constructing the straight section. However, when constructing a sharp curve, the length of the shield excavator is shortened by shortening the movable girder section (7) and the movable tail section (5). At this time, a segment (6) narrower than the normal segment is used, and a shield jack (3) is used.
), it is also necessary to replace ζ with a jack with a short stroke.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

(Effects of the Invention) As described above, the shield excavator according to the present invention has a movable tail section which is connected to the shield main body equipped with the rock excavation mechanism on the front surface through a bending jack and is extendable and retractable. This allows the shield excavator to perform work on straight sections of tunnels in the same way as conventional shield excavators, while shortening the length of the shield excavator for curved sections, making it possible to construct sharp curves and improving work efficiency. .

In addition, according to the present invention, it is possible to reduce excess excavation when constructing a sharp curve, and it is also possible to easily secure ground reaction force, eliminate or reduce the need for auxiliary methods for ground improvement, and reduce the overall burden of tunnel construction. This shortens the construction period and reduces construction costs.

Furthermore, according to the present invention, it is possible to construct sharp curves, so it is possible to construct a vertical shaft or inclined shaft and a main tunnel simultaneously and in succession, and therefore there is no need for a starting shaft for a shield excavator, which is required in conventional construction methods. This will shorten the overall tunnel construction period and further improve economic efficiency.

According to a second aspect of the invention, the girder portion of the knoll main body in the shield excavator is configured to be expandable and retractable, thereby making it easier to construct sharp curves.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional plan views showing an embodiment of the shield excavator for curved lines according to the present invention.Figure 1 shows the state when constructing a curved section, and Figure 2 shows the state during construction of a horizontal straight section. Indicates the state at the time. 3 and 4 show other embodiments of the shield excavator for sharp curves according to the present invention.
The figure shows the state when the curved section is being constructed, and Figure 4 shows the state when the horizontal straight section is being constructed. (1)...Shield body, (2)...Cutter face plate, (4)...Central bending jack, (5)...Movable tail part, (7)...Movable girder part.

Claims (1)

[Claims of Claims] 1. A shield for sharp curves, characterized in that a movable tail section is extendable and retractable, connected to a shield body equipped with a rock excavation mechanism on the front surface via a bending jack. excavator. 2. The shield excavator for sharp curves according to claim 1, wherein the girder portion of the shield main body is configured to be expandable and retractable.