JP2000110485A - Bit replacing type shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine for mechanically replacing a worn bit of the shield machine at an excavating site without the combined use of an auxiliary construction method of soil improvement or the like. SOLUTION: A shield machine for replacing a worn bit of the shield machine at an excavating site comprises a plurality of spokes 2; cutter face plates composed of divided face plates 3A (3B) dividedly arranged in concentric shape between the spokes 2; a divided face plate take-in device mounted inside the shield machine; and a storage cylinder for enclosing the divided face plate take-in device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an excavating site,
The present invention relates to a shield machine for replacing a wear bit.

[0002]

2. Description of the Related Art In order to reduce the construction cost of shield tunnels, there is a tendency to increase the interval between shafts and lengthen tunnel sections. As the shield excavation distance of one unit increases,
The wear of the bit becomes severe, and the bit needs to be replaced. Especially in coarse sand layers and sand layers mixed with gravel,
Not only is the wear of the carbide bits, but also the base material on which the bits are mounted severely worn.

There is a rescue bit method as a technique for mechanically exchanging bits at the excavation site. In this method, a stored new bit is directly pushed by a jack or pushed out using a crank mechanism, in addition to a bit normally used.

However, the conventional method has the following problems. Bit exchange can be performed only once. For this reason, it cannot be adopted when several bits need to be replaced including gravel. Since the push-out mechanism is provided for each new bit, the number of installed bits is limited, and the large number of the bits complicates hydraulic piping and the like. The bits can be exchanged by remote control, but the degree of wear must be determined from the wear amount of several wear detection bits. For this reason, even a sound bit may be replaced, which is uneconomical. Particularly in a coarse sand layer or a sand layer mixed with gravel, not only the bit is worn but also the face plate is severely worn, but the face plate cannot be repaired by the conventional method.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is intended to use an auxiliary construction method such as ground improvement at a site where a worn bit of a shield machine is being excavated. It is an object of the present invention to provide a shield machine for mechanical replacement without using a shield machine.

[0006]

A shield excavator for replacing a wear bit of a shield excavator at a site being excavated, wherein the excavator includes a plurality of spokes and is divided concentrically between the spokes. A bit exchange type shield excavator, comprising: a cutter face plate constituted by a divided face plate; a divided face plate capturing device mounted inside the shield machine; and a storage cylinder for accommodating the divided face plate capturing device. . In addition, the spokes are provided with concave portions on both side surfaces adjacent to the divided face plate, provided with convex portions on both side end portions of the divided face plate, provided with bits at the side end portions of the divided face plate, and provided with a handle on the back surface of the divided face plate. It is a bit exchange type shield excavator characterized by being provided. Furthermore, the split face plate taking-in device is characterized by comprising a horizontal frame fixed to a horizontal jack, upper and lower jacks fixed to the horizontal frame and fixed to upper and lower frames, and a gripper installed on the back of the horizontal frame. It is a bit exchange type shield machine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

<A> Overall Configuration FIG. 1 is a front view of a cutter face plate 1 of a shield excavator according to the present invention. The cutter face plate 1 includes a plurality of spokes 2,
The spokes 2 are constituted by divided face plates 3A and 3B arranged concentrically and separated by a slit S between the spokes 2.

<B> Spoke FIG. 2 is a perspective view showing a situation in which the divided face plate 3B is attached to the spoke 2. In this embodiment, four spokes 2
Forms the skeleton of the cutter face plate 1. Concave portions 21 are provided on both side surfaces of the spoke 2. The entrance of the recess 21 is open at the back of the spoke 2 (the side opposite to the face), and the inside forms a passage that is curved in the direction of the center of the spoke 2. Recess 2
Numeral 1 is that the spoke 2 and the divided face plate 3A (3B) are integrated with the convex portion 31 installed at the end of the divided face plate 3A (3B) described later. (FIG. 3) The recess 2 provided in the divided face plate 3A (3B) and the spoke 2
1. A structure in which the convex portions 31 are provided in reverse may be adopted.

<C> Dividing face plate The dividing face plates 3A and 3B attached between the spokes 2 and 2 have a structure in which a certain gap δ is provided and each can be divided. Protrusions 31 are provided at both side end portions of each divided face plate 3A (3B). This convex portion 31 is provided on each divided face plate 3A,
3B is moved in the shield advancing direction.
1 can be fitted and disassembled, and cannot be disassembled by the rotation of the spokes 2. Dividing face plate 3A
A bit 32 is provided only on one side end of (3B), and a handle 33 is provided on the back surface of the divided face plate 3A (3B). (FIG. 4) The slits S for discharging the excavated earth and sand are formed between each of the divided face plates 3A and 3B and the spokes 2.

<D> Dividing face plate taking-in device FIG. 4 is a perspective view of the dividing face plate taking-in device 4. The split face plate taking-in device 4 is an apparatus for moving the split face plate 3A (3B) in the horizontal and vertical directions. Dividing face plate 3A (3B)
The mechanism for moving the horizontal in the horizontal direction is a horizontal jack 41.
And a horizontal frame 42 fixed to a horizontal jack 41. A mechanism for moving the divided face plate 3A (3B) in the vertical direction includes an upper and lower jack 44 fixed to the horizontal frame 42 and an upper and lower frame 43 fixed to the upper and lower jacks 44. Gripper 45 for gripping divided face plate 3A (3B) by divided face plate taking-in device 4
Is installed on either the horizontal frame 42 or the upper and lower frames 43.

<E> Storage Tube FIG. 5 is a front view showing the storage tube 5 installed on the partition wall D of the shield excavator, and FIGS. 6 and 7 are side views thereof. Storage tube 5
Is a closed cylindrical body installed behind the partition wall D of the shield excavator. The front shape of the storage cylinder 5 is similar to the divided face plate 3A and slightly larger. A lid 51 is attached to the front of the front end of the storage cylinder 5 so as to be freely opened and closed. A closed hatch 52 is provided on the side of the storage cylinder 5 near the distal end, and functions as a drain for muddy water and the like that has entered the storage cylinder 5 and as a doorway for workers.

[0013]

The operation of the bit-exchange type shield machine according to the present invention will be described below.

<B> Stopping rotation of the cutter face plate A shield excavator is excavated by an ordinary method, and a bit 3
At the stage when 2 is worn, the rotation of the cutter face plate 1 is stopped. The rotation stop position of the cutter face plate 1 stops the rotation when the position of the divided face plate 3A of the cutter face plate 1 matches the position of the lid 51 of the storage tube 5.

<B> Movement of Dividing Face Plate The lid 51 of the storage cylinder 5 is opened, and the horizontal jack 41 is pushed out of the storage cylinder 5. (FIG. 6) Thereafter, as shown in FIG. 4, the gripper 45 is pressed against the grip 33 while operating the horizontal jack 41 and the upper and lower jacks 44 to grip the divided face plate 3A. When gripping the divided face plate 3A, the horizontal frame 41, the upper and lower frames 43, and the upper and lower jacks 44 move simultaneously by operating the horizontal jack 41, and only the upper and lower frames 43 move by operating the upper and lower jacks 44.

<C> Bit Replacement After the ceiling of the shield machine has been dug in advance, the divided face plate 3A is temporarily moved forward (ground side) by operating the horizontal jack 41.
And pull out the cutter. Cutter to storage tube 5
And the lid 51 of the storage tube 5 is closed. After discharging the muddy water or the like that has entered the storage cylinder 5, the hatch 52 is opened, and the worker W enters the storage cylinder 5, or inserts the body into the storage cylinder 5 to replace the worn bit 32. (FIG. 8)

<D> Resuming the excavation work After replacing the worn bit 32, the divided face plate 3A is returned and fitted between the spokes 2 by the reverse procedure, and the cutter face plate 1 is rotated to excavate the shield excavator. Resume work.

[0018]

[Embodiment 2] FIG. 9 is a front view showing another embodiment of the present invention. In the present embodiment, the partition D
Are provided with two storage tubes 5, 5a. One is a storage tube 5 of a shape and size capable of storing the divided face plate 3A, and the other is a storage tube 5a of a shape and size capable of storing the divided face plate 3B.
It is. The storage cylinders 5 and 5a are installed at positions opposite to each other with respect to the center of the cutter face plate 1, and are installed at positions where the cutter face plate 1 passes during rotation. In this case, instead of the upper and lower jacks 44 and the upper and lower frames 43 of the first embodiment, a structure in which the entire horizontal jack 41 can be moved up and down may be adopted.

[0019]

Since the present invention has been described above,
The following effects can be obtained. <B> Since the storage cylinder is installed on the partition wall and the divided face plate can be moved back and forth and up and down, the bit can be exchanged inside the storage cylinder. <B> For the same reason, bit replacement can be performed whenever necessary, so even when bit replacement is required several times including gravel, it can be adopted without ground improvement. <C> Since the replacement of worn bits is performed directly by visual observation, the replacement of the bits can be minimized, and the replacement can be performed efficiently and economically. <D> A worn bit can be repaired as well as a worn bit can be replaced.

[Brief description of the drawings]

FIG. 1 is a front view of a cutter face plate of a shield excavator according to the present invention.

FIG. 2 is a perspective view showing a situation where a divided face plate is attached to spokes.

FIG. 3 is a perspective view showing a situation where a concave portion and a convex portion are united.

FIG. 4 is a perspective view of a split face plate capturing device.

FIG. 5 is a front view in which a storage cylinder is installed on a partition wall of the shield excavator.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is another side view of FIG. 5;

FIG. 8 is a perspective view showing a bit replacement state.

FIG. 9 is a front view showing another embodiment of installing a storage cylinder.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Sakae 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation F-term (reference) 2D054 BA07 BB07

Claims (3)

[Claims] 1. A shield machine for exchanging a wear bit of a shield machine at a site where a machine is being machined, comprising: a plurality of spokes; and a divided face plate arranged concentrically between the spokes. A bit exchange type shield excavator, comprising: a cutter face plate to be configured; a divided face plate capturing device mounted inside the shield machine; and a storage cylinder for accommodating the divided face plate capturing device. 2. The bit exchanging shield excavator according to claim 1, wherein the spokes are provided with concave portions on both side surfaces adjacent to the divided face plate, and provided with convex portions on both side end portions of the divided face plate. A bit-exchangeable shield excavator characterized by providing a bit at the side end and a handle at the back of the divided face plate. 3. The bit exchanging shield excavator according to claim 1, wherein the split face plate taking-in device comprises: a horizontal frame fixed to a horizontal jack; and an upper and lower jack fixed to the horizontal frame and fixed to the upper and lower frames. And a bit-exchange shield excavator, comprising a gripper installed on the back of the horizontal frame.