JP3161890B2 - Multifunctional shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multifunctional shield machine for laying cables for power and communication, and for excavating tunnels used for sewage and the like.

[0002]

2. Description of the Related Art Compared with railway and road tunnels, tunnels for laying power and communication cables and for providing sewerage are often excavated under roads in urban areas, and thus are subject to various restrictions.

[0003] Therefore, conventionally, a sharply curved construction shield, a long-distance construction shield capable of reducing the number of starting shafts and reaching shafts, excavation from both ends of the tunnel, and joining of two shields in the middle of the tunnel. Underground joint compatible shield that shortens the construction period by dividing the shield body into front and rear, and assembling them in the start shaft, the shield front and rear split assembly start system that minimizes the start shaft Etc. have already been developed.

[0004]

However, in the conventional shield machine described above, if all of these functions were to be satisfied, there was a problem that the structure became complicated and the cost became high.
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has as its object to provide a multifunctional shield machine having the functions of a conventional shield machine with a simple configuration at a low cost.

[0005]

In order to achieve the above object, the present invention divides a shield body propelled into the ground by a shield jack into a front shield and a rear shield, and articulates between these front and rear shields. A jack is made freely bendable, and a cutter head is rotatably provided at an opening of a chamber provided at a front portion of the front shield, and a cutter head is inserted between the cutter head and the rear shield from a digging position into the chamber. It is provided with a lattice jack that can be pulled into the machine.

[0006]

According to the above configuration, it is possible to cope with a steep curve construction, a long-distance construction, and an underground joining in which two shield bodies are joined underground with a simple structure.

[0007]

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a multifunctional shield machine, in which 1 indicates a shield body and 2 indicates a cutter head.

The shield body 1 is divided into a front shield 1a and a rear shield 1b.
The spherical joint 3 protruding from the front end of the front shield 1a is inserted inside the front shield 1a from the rear end of the front shield 1a, and is provided on the spherical surface 3a of the spherical joint 3 on the inner peripheral surface of the front shield 1a. The seal 4 is pressed into contact with the front and rear shields 1a and 1a.
Earth and sand and muddy water do not enter the shield main body 1 from the space between b.

A plurality of articulated jacks 5 are provided between the front and rear shields 1a and 1b, and the articulated jacks 5 allow the front and rear shields 1a and 1b to bend freely. In the figure, reference numeral 6 denotes a shield jack for propelling the shield body 1.

On the other hand, a chamber 1d divided by a partition 1c is formed at the front of the front shield 1a.
The cutter head 2 is provided in a front opening of the chamber 1d. The outer diameter of the cutter head 2 is slightly smaller than the inner diameter of the chamber 1d, and the rear end of a support beam 2a protruding from the rear surface of the cutter head 2 is rotatably supported on a slide ring 9 via a bearing 8. Have been.

The slide ring 9 is fitted slidably back and forth in a circular hole 1e opened in the center of the partition wall 1c, and a plurality of lattice jacks 10 are provided between the slide ring 9 and the rear shield 1b. When the cutter head 2 is moved back and forth by the lattice jack 10 through the slide ring 9, the cutter head 2 is moved into the chamber 1 d from the excavation position shown in FIG.
Can be retracted.

The cutter head 2 is rotatable by a cutter head motor (not shown), and a cutter head 2 is provided between the slide ring 9 and a locking portion 1f protruding from a rear portion of the partition wall 1c. Is detachably interposed in the digging position. On the outer peripheral portion of the cutter head 2, for example, four over cutters 13 are provided so as to be able to protrude and retract from the outer peripheral surface as shown in FIG.

The overcutter 13 is a cutter head 2
The outer diameter of the front shield 1a is formed to be smaller by almost the thickness of the skin plate of the front shield 1a, so that when the cutter head 2 excavates, it projects to the position shown in FIG. When the cutter head 2 is overcut and the cutter head 2 is pulled into the chamber 1d, the cutter head 2 is stored at the position shown in FIG.

Next, when the shield body 1 is started from the starting shaft, the spacer 12 is removed and the cutter head 2 is stored in the chamber 1d by the lattice jack 10 as shown in FIG. As a result, the overall length of the shield body 1 can be reduced, so that the starting shaft can be reduced in size.

During the tunnel excavation, the cutter head 2 is advanced to the excavation position shown in FIG. 1, the cutter head 2 is rotated by the cutter head motor, and the cutter head 2 excavates the cutting face. First, as shown in FIG. 5, the front shield 1a is retracted together with the cutter head 2 by the articulated jack 5 to reduce the total length of the shield body 1, and then the front and rear shields 1a, 1b are reduced by the articulated jack 5 in this state. By bending the space, sharp curve construction becomes possible.

On the other hand, when two shield excavators are excavated from both ends of the tunnel and the respective shield main bodies 1 are joined at an intermediate portion of the tunnel, as shown in FIG. 2 over cutters 1
After storing the spacers 3 and then removing the spacers 12, the articulated jacks 5 are extended while holding the lattice jacks 10 to join the front ends of the front shields 1a.

In this state, the freezing range 15 shown in FIG.
Is frozen using a freezing tube or the like, or the ground of the face is frozen from the leading shield body 1 side, and then the freezing area is excavated by the trailing shield body 1 to join the front ends of the front shield 1a. . Thereafter, the cutter head 2 and the like in the shield main body 1 are removed to complete the joining, and the shield main body 1 is buried in the ground as a part of the segment as it is.

[0018]

According to the present invention, as described in detail above, the cutter head provided at the front end of the front shield can be retracted into the chamber. This makes it possible to reduce the size of the starting shaft and the reaching shaft, thereby facilitating construction in urban areas. In addition, since the shield body is divided into front and rear shields and the space between these shields is freely bendable, sharp curve construction can be easily performed, and excess drilling can be reduced by reducing the machine length at the time of sharp curve construction. It can improve quality and reduce construction costs.

Further, in the underground joining by the freezing method,
Since the front shield can be advanced by joining the front shields by supporting the cutter head and rear shield with the segments and not retreating, the freezing range only needs to be near the joint, thereby reducing the freezing range and freezing. The tool and the cost required for freezing can be reduced, and long-distance construction can be performed by providing a plurality of overcutters which can be protruded and retracted on the outer peripheral portion of the cutter head.

[Brief description of the drawings]

FIG. 1 is a sectional view of a multifunctional shield machine according to an embodiment of the present invention.

FIG. 2 is a front view of the cutter head in a state where an over cutter is stored.

FIG. 3 is a front view of the cutter head in a state where an over cutter is projected.

FIG. 4 is an operation explanatory view of the multifunctional shield machine according to one embodiment of the present invention;

FIG. 5 is an operation explanatory view of the multifunctional shield machine according to one embodiment of the present invention;

FIG. 6 is an operation explanatory view of the multifunctional shield machine according to one embodiment of the present invention;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shield body 1a front shield 1b rear shield 1d chamber 2 cutter head 5 articulated jack 6 shield jack 10 lattice jack 13 over cutter

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 301-302

Claims (2)

(57) [Claims] 1. A shield body 1 propelled into the ground by a shield jack 6 is divided into a front shield 1a and a rear shield 1b, and a space between these front and rear shields 1a and 1b is made bendable by an articulate jack 5.
Further, a cutter head 2 is rotatably provided in an opening of a chamber 1d provided in front of the front shield 1a, and the cutter head 2 is disposed between the cutter head 2 and the rear shield 1b from an excavation position in the chamber 1d. A multifunctional shield excavator equipped with a lattice jack 10 that can be retracted into the machine. 2. The shield machine according to claim 1, wherein a plurality of over cutters are provided on an outer peripheral portion of the cutter head so as to be able to protrude and retract.