JPH0476192A - Rolling method for overlap circular shield and device thereof - Google Patents

Abstract

PURPOSE:To make a tunnel sectional form convertible with a little energy as well as to prevent any breakage accident from occurring by installing a copy cutter in a disk cutter of an overlap circular shield machine, and setting up an attitude controller in a drilling machine body. CONSTITUTION:A outbreak is given to a lower part D at the cutter side of 0-1 by a copy cutter built in a cutter unit 21, and a shield body is rotated counterclockwise by gravity of the cutter unit 21 and earth pressure. Simultaneously with this, a control plate 2 is tilted by an attitude controller 20. Next, when a drilling machine body 1 is advanced forward by a shield jack 23, this body 1 is given turning force counterclockwise by the control plate 2, and the body 1 gets rotating, converted into a longitudinal section from the crosswise with the 0-2 as the center. In addition, the cutter 24 is retracted and the outbreak is suspended, and the control plate 2 is made level, thereby boring longitudinal twin tunnels. Moreover, the longitudinal twin tunnels is made into lateral twin tunnels likewise and rolling takes place in the same manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to attitude control of a shield excavator equipped with an overlapping circular cutter.

[Conventional technology]

Recently, a shield construction method using overlapping circles has been developed called multi-shield, and a construction method that can change from a vertical section to a cross section has been published in the press. This construction method is shown in Figures 9 to 11.
As shown in the figure, in the case of a left and right cross section (Fig. 9), it has a strong sliding surface 31 in the center and uses each center folding device, for example, the right side is diagonally downward and the left side is diagonally upward. (Fig. 10), and when digging with this, the machine rolls using the warping effect of the sides 30a and 32a of the shield body 30° 32, and the cross section changes from horizontal (Fig. 9) to vertical (Fig. 11). It is something.

[Problem to be solved by the invention]

The above-mentioned conventional technology has the following problems.

The left and right shield bodies 30.32 are tilted upward and downward, respectively, and in order to properly receive the several thousand tons of thrust from the shield jacuzzi and roll, the sliding surface is the joint between the left and right shield bodies 30.32. 31 needs to have a very strong structure, and there is also a possibility that earth and sand may get trapped there and make it impossible to restore.

In addition, if the left and right cross sections are the same, it is considered to be stable in terms of construction method, but if the cross sections are uneven, forced rolling from side to side ← up and down due to the warping effect will make the work extremely difficult because the center of rotation cannot be determined. It is assumed that

In general, it is easy for shield machines to tilt downward from horizontal using gravity, but with the center at 0-5, O-4→
When changing upwards like O-4' → 0-04', a very strong upward moment load is required, but the method described above requires rolling at the same time. It is a difficult construction method because
It is also considered that an unreasonable external force is applied to the machine device.

In addition, as a method for forced rolling, we have previously applied for utility model registration for the shield excavator attitude control device i!
(Utility Application No. 01-147652), it is unknown even if the control plate is damaged, and it is difficult to control the protrusion of the control plate, the angle of the control plate, etc. Furthermore, since it is not possible to determine how much force is being applied, there are many cases in which the control board is damaged due to unreasonable usage, or the control board is not activated due to excessive consideration of safety. Currently, it is rarely used.

[Means to solve the problem]

When rolling halfway between a horizontal twin tunnel and a vertical twin tunnel, rolling is performed by making the center of one cutter device of the overlapping circular shield the rolling center and moving the other cutter device downward. It is believed that downward movement is easier than upward movement and that stable rolling can be performed, and the machine is equipped with several shield excavator attitude control devices according to Utility Model Application No. 01-147652 attached to the twin shield bodies. If used in conjunction with the extra digging of a conventional copy cutter, it can be rolled using the machine's heavy weight and tonosho. Further, after that, it is possible to turn the entire machine upward and return it to the vertical position using conventional techniques, since only the vertical position is changed.

Additionally, a strain gauge is incorporated into the control board to detect the stress that the control board receives.

[Effect]

By changing the rolling center downwards, it is possible to roll using gravity without applying unnecessary force.

By incorporating a strain gauge into the control board of the attitude control device,
Since the permissible load is known, the extension amount, angle, etc. of the control plate can be set to the optimum state, and posture control can be performed more effectively.

The copy cutter installed on the cutter device performs extra digging in the direction of movement (rotation direction) of the cutter device, and the control plate attached to the shield excavator body controls the rotation of the shield excavator body around its axis in the direction of travel. to convert between a vertical tunnel and a horizontal tunnel (rolling).

〔Example〕

In Figures 1 to 8, 1 is the shield excavator main body;
2 is a control board with a rectangular or square cross section, 3 is the same control board 2
A jack 4 for taking in and out is a guide member (rotating body), and the guide member 4 is rotatably supported by the shield excavator main body 1. Further, a control plate guide hole is bored in the guide member 4, and a sealing material 5 is provided in the annular groove on the inner peripheral surface of the control plate guide hole to seal between the control plate 2 and the control plate 2. It is inserted. Further, an annular groove is provided on the outer periphery of the guide member 4, and a sealing material 6 for sealing between the shield excavator body 1 and the shield excavator body 1 is fitted into the annular groove. The shield is designed to prevent water from entering into the excavator main body 1. Further, 7 is a support member fixed to the shield excavator main body 1 via bolts, 10 is a cylindrical gear portion fixed to the guide member 4 via bolts, and the jack 3 is attached to the cylindrical gear portion 10. It is being 8 is the cylindrical gear portion 1
0, 9a and 9b are pistons provided at both ends of the rack 8, and 11 is a cylinder containing the pistons 9a and 9b and the rack 8;
is attached to the support member 7. Further, A and B are pressure chambers formed within both ends of the cylinder 11.

Supplying pressure oil to one of the pressure chambers A and B of the cylinder 11,
After discharging from the other side, move the rack 8 and control board 2.
angle. Further, a permissible value of the detected value of the strain gauge 12 is set in advance, a value slightly smaller than the permissible value is estimated, and the jack 3 is extended to make the control plate 2 stick out. A load is applied to the control plate 2 by extending the shield jack 23 and moving the shield body l forward. Therefore, the control plate 2 was extended to the allowable value to apply an effective load to the control plate 2, and the lower part (D section) on the cutter side of 01 was excavated using the copy cutter 24 built in the cutter device 21. By applying extra digging, the shield main body 1 is tilted as shown in Fig. 4, centered at 0-2 in Fig. 3, due to the rolling force of the control plate 2, which reduces gravity and earth pressure, and finally As shown in Figure 5, the cross section is a combination of upper and lower sections.

Further, contrary to the above, conversion from vertical twin multi to horizontal twin multi is also sufficiently possible by performing the downward rotation in the same way.

Further, the inside of the control board 2 is partially partitioned, and the strain gauge 12 is embedded in the load acting surface thereof, and the lead wire 13 is extended to the outside. Also, the space is sufficiently filled with coating material and sealed.

The installation part of the attitude control device 20 is shown in FIG. 1.2.

In the figure, 21 is a cutter device, and 24 is a cutter device 2.
1 is a built-in copy cutter, 23 is a shield jack inside the shield excavator main body 1, an attitude control device, 2
A plurality of 0's are provided in the shield excavator main body 1.

Next, the case of rolling from the horizontal twin tunnel shown in FIG. 3 to the vertical twin tunnel shown in FIG. 5 will be explained.

As mentioned above, in the state shown in Fig. 3, the copy cutter 24 excavates the D part to provide extra digging, and due to the gravity and earth pressure of the cutter device 21, 0-1 descends, that is, the shield excavator body turns counterclockwise. Do it like this. At the same time, the control plate 2 is tilted by the attitude control device 20 as shown in FIG. When the shield excavator main body 1 is pushed forward by the shield jack 23, a counterclockwise rotational force is applied to the main body 1 by the control plate 2.

Therefore, the shield excavator main body 1 starts rotating counterclockwise,
The state shown in FIG. 4 is reached, and then the state shown in FIG. 5 is reached. When the state shown in FIG. 5 is reached, the copy cutter 24 is retracted to stop the extra digging, the control Fi2 is set horizontally, and the vertical and double installation/tunnels are excavated.

Rolling of a vertical twin tunnel into a horizontal twin tunnel is carried out in the same manner, but since gravity is used in this case as well, the position of over-digging by the copy cutter 24 is set at the position of the upper cutter 0-2 in Fig. 5. Becomes lateral.

[Effects of the Invention] The present invention provides a superimposed circular shield excavator equipped with a dual cutter device consisting of two disc-shaped cutters, in which a copy cutter is installed inside each disc-shaped cutter, and the shield excavator body is provided with a A control device is installed, and rotational force is generated on the shield excavator body by over-digging by the copy cutter of one cutter and tilting of the control board of the attitude control device, and rolling near the center of rotation of the other cutter. By converting the horizontally long cross section and the vertically long cross section using the center of , the following effects are obtained.

With the center of one disc-shaped cutter as the center of rolling,
Rolling can be performed in the direction of shifting the other cutter downward, and since gravity and earth pressure are fully utilized, the cross-sectional shape of the tunnel can be changed with less energy.

By attaching a strain gauge to the control plate of the attitude control device, the control plate can be effectively utilized to match the allowable load and damage accidents can also be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a rolling device for a polymerized circular shield according to the present invention, FIG. 2 is a cross-sectional view of the main body of the shield excavator shown in FIG. 1, and FIGS. 3 to 5 are a rolling method according to the present invention. Explanatory drawings, FIG. 6 is a view in the direction of the X arrow in FIG. 3, FIG. 7 is a detailed sectional view of the attitude control device used in the present invention, FIG. 8 is a view in the direction of the y-X arrow in FIG. 7, and FIG. 11 to 11 are explanatory diagrams of the conventional rolling method. 1... Shield excavator body

Claims (2)

[Claims] (1) In a superimposed circular shield excavator equipped with a twin cutter device consisting of two disc-shaped cutters, each disc-shaped cutter is equipped with a copy cutter, and a posture control device is installed in the shield excavator main body, The over-digging by the copy cutter of one cutter and the tilting of the control board of the attitude control device generate rotational force on the shield excavator main body, and the rolling center is set near the rotation center of the other cutter to create a horizontally long A rolling construction method for overlapping circular shields that is characterized by converting cross-sections and vertical cross-sections. (2) In a superimposed circular shield excavator equipped with a twin cutter device consisting of two disc-shaped cutters, a copy cutter that can be retracted is attached to each disc-shaped cutter, and a posture control is installed on the main body of the shield excavator. . A rolling device for a superimposed circular shield, characterized in that a strain gauge is incorporated in the control plate of the attitude control device.