JPH0545676Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rolling regulating device for a shield having a cross-sectional shape other than circular.

[Prior Art] A shield is constructed by assembling segments having substantially the same shape as the shield frame inside the shield frame. Therefore, unlike a shield with a circular cross-section, if a shield has a cross-sectional shape other than circular, such as a rectangular or elliptical cross-section, even if rolling occurs, part of the inner circumferential wall of the shield frame will be damaged. Since rolling is restricted by hitting the outer peripheral wall of the fixed segment, no further rolling occurs.

[Problem to be solved by the invention] However, when a part of the inner circumferential wall of the shield frame comes into contact with the outer circumferential wall of the segment, there is no clearance in the abutting part, so the next part is on the same side as the abutting part. When trying to assemble the segments, a problem arises in that it becomes difficult to adjust the position of the segments, making it impossible to assemble the segments.
To solve this problem, it is possible to install a steel spacer on the rear inner peripheral wall of the shield frame as in the case of conventional circular shields, but if the segments are made of concrete, the collision of the spacers may cause the segments to There is a risk of chipping.

The present invention has been made to solve the problems of the prior art described above, and it is possible to secure a clearance between the inner circumferential wall of the shield frame and the outer circumferential wall of the segment to restrict rolling of the shield frame, and to prevent the shield frame from rolling. It is an object of the present invention to provide a rolling regulating device for a shield that can be easily assembled and can prevent damage to concrete segments.

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a predetermined clearance in the rear inner circumferential wall of the shield frame having a cross-sectional shape other than circular with respect to the outer circumferential wall of the assembled segment. A resin regulating body is attached to prevent the shield frame from rolling.

[Function] When the shield rolls, the resin regulating body attached to the inner peripheral wall of the shield frame hits the outer peripheral wall of the segment, thereby regulating the rolling. Since the regulating body secures a predetermined clearance between the inner circumferential wall of the shield frame and the outer circumferential wall of the segment, the position of the segment can be easily adjusted and the segment can be easily assembled.

Further, since the regulating body is made of resin, even if the segment is made of concrete, the segment will not be damaged by the regulating body.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In FIGS. 4 and 5 showing mud pressure shields having cross-sectional shapes other than circular, 1 is a shield frame formed in a cocoon-shaped cross-sectional shape in which two circles are connected in parallel; A bulkhead 2 is provided on the front end side. Two rotary cutters 3 are attached to the bulkhead 2, and the cutters 3 are rotated by a drive device 4 installed at the rear of the bulkhead 2. It's summery. Katsuta 3 for bulkhead 2
A screw conveyor 5 is arranged in parallel to carry out the earth and sand excavated by the shield frame 1 to the rear of the shield frame 1.

Furthermore, erector rings 6 whose rotation center is the center of each circle are arranged in parallel inside the shield frame 1, and erectors 8 for assembling the segments 7 along the inner peripheral wall of the shield frame 1 are attached to these erector rings 6. It is being 9 is a shield jack, and 10 is a tail seal.

The rear (tail) inner peripheral wall of the shield frame 1 is made of resin (synthetic resin, A rolling regulating device 12 comprising a regulating body 11 made of hard rubber or the like is provided.
The regulating body 11 is formed with a chamfered rectangular cross section as shown in FIG. 3, and is divided into suitable lengths for easy handling as shown in FIGS. A desired length is formed by connecting each other with a joint (which may be a dovetail joint) 13 and a set screw 14. In order to install the regulating body 11 along the inner circumferential wall of the shield frame 1, the regulating body 11 is attached to the inner circumferential wall of the shield frame 1.
A fitting groove 15 is formed on the outer circumferential side of the regulating body 11, and shaft holes 17 for passing a fixing rod shaft 16 in the width direction of the regulating body 11 are formed at appropriate intervals in the longitudinal direction. . By fixing both ends of the rod shaft 16 passed through these shaft holes 17 to the inner circumferential wall of the shield frame 1 by welding 18, the regulating body 11 can be easily attached. The regulating bodies 10 are arranged continuously along the inner periphery of each circle except for the connecting part 19 that connects two circles, in a range that can regulate the rolling of the shield, but are disposed intermittently at appropriate intervals in the circumferential direction. Alternatively, they may be arranged continuously over the entire circumference of the shield frame 1 (including the connecting portion 19).

According to this configuration, when the shield rolls, the regulating body 11 attached to the inner circumferential wall of the shield frame 1 hits the outer circumferential wall of the segment 7, thereby regulating the rolling. Regulator 1
1 comes into contact with the outer circumferential wall of the segment 7, a clearance 10 is created between the inner circumferential wall of the shield frame 1 and the outer circumferential wall of the segment 7 due to the regulating body 11.
Since this is ensured, the position can be easily adjusted when assembling the segments 7, and the segments 7 can be assembled easily. Furthermore, since the regulating body 11 is made of resin and is softer than concrete, even if the regulating body 11 hits a segment made of concrete, the segment 7 will not be damaged. Furthermore, when attaching the regulating body 11 to the shield frame 1, a mounting groove 15 is formed in the shield frame 1, and the regulating body 11 is fitted into this mounting groove 15, and the rod shaft 16 inserted in the width direction of the regulating body 11 is inserted into the mounting groove 15. Since both ends are fixed to the shield frame by welding and the regulating body 11 is attached, the resin regulating body 11 can be easily and reliably attached to the steel plate shield frame 1.

Note that the cross-sectional shape of the shield frame 1 is rectangular.
It may be polygonal, oval, etc.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) A resin regulating body is attached to the inner circumferential wall of the shield frame, which has a cross-sectional shape other than circular, to form a predetermined clearance to the outer circumferential wall of the segment and block the rolling shield frame. Rolling of the shield frame can be restricted by ensuring a clearance between the inner circumferential wall of the frame and the outer circumferential wall of the segment.

(2) Since a clearance can be secured between the inner circumferential wall of the shield frame and the outer circumferential wall of the segment, the position of the segment can be easily adjusted and the segment can be easily assembled.

(3) Since the regulating body is made of resin, even if the segments are made of concrete, damage to the segments due to contact with the regulating body can be prevented.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the shield rolling regulating device according to the present invention, Fig. 2 is an enlarged view of the main part, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is A sectional view of the shield, FIG. 5, is a view of the shield seen from the rear. In the figure, 1 is a shield frame, 7 is a segment, 10 is a clearance, and 11 is a regulating body.

Claims (1)

[Scope of utility model registration request] A resin regulating body is attached to the rear inner circumferential wall of the shield frame having a cross-sectional shape other than circular, which forms a predetermined clearance with respect to the outer circumferential wall of the assembled segments and blocks the rolling shield frame. Features a shield rolling control device.