JPH09125868A - Center cutter structure of inclined shaft excavating machine and inclined shaft excavating machine thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to replace a center cutter with ease when excavating upward an inclined shaft. SOLUTION: A shaft 1 is provided on both ends of a cutter holder H1 while a guide member 2 is provided on a cutter head D, thereby forming a guide groove 2a which moves slidingly the shaft 1 of the aforesaid cutter holder H1 into an excavating machine by a specified distance. A rotary part 2b whose shaft 1 is turnable, is formed on the inner end of this guide groove 2a. This construction makes it possible to lock the cutter holder H1 with the guide member 2 on the inner end side of the machine by moving the cutter holder slidingly by a specified distance along the guide groove 2a when a center cutter C is replaced, and thereby prevent the drop of the guide member and direct the front surface of the center cutter C inwardly to the machine by turning the guide member at the guide groove on the inner end side of the machine. It is also possible to replace the center cutter C with ease from inside the machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center cutter mounting structure equipped on a cutter head of a slant shaft excavator for excavating a slant shaft upward and a slant shaft excavator equipped with the mounting structure. The present invention relates to a center cutter mounting structure for an inclined shaft excavator, which allows the center cutter to be easily exchanged from the inside of the inclined shaft excavator, and the inclined shaft excavator.

[0002]

2. Description of the Related Art Conventionally, a tunnel excavator has been widely used as a machine for excavating a rock mass to form a tunnel, and excavates a wide range of geological formations from hard rock formations to soft formations including fracture zones. A cutter disk provided in front of such a tunnel excavator is equipped with a plurality of ring type roller cutters capable of excavating all of these changing geology. (In this specification, the inner roller cutter is simply referred to as the roller cutter, and the center roller cutter is referred to as the center cutter.) As this tunnel excavator, an oblique excavation is performed to excavate a slant shaft upward as a hydraulic pipeline in a hydraulic power plant. The inclined shaft excavator has a cutter head D in front of the tunnel excavator T as shown in the front view of the tunnel excavator according to the present application shown in FIG.
A cutter holder H equipped with a center cutter C is provided at the center of the cutter head D, and a plurality of roller cutters R are arranged around the cutter holder H. Then, the cutter head D is swung while pressing it against the natural ground to excavate the natural ground with the roller cutter R and the center cutter C. The roller cutter R and the center cutter C have a predetermined excavation distance. When a certain amount of wear is reached, it is replaced and excavation is continued to form a tunnel. Also, when excavating, the center cutter C or the roller cutter R
If the center is damaged, the center cutter C or the roller cutter R is replaced and excavation is continued to form a tunnel. Since the excavation reaction force acts on the center cutter C or the roller cutter R from the front surface of the cutter head, they are securely fixed from the front surface by the cutter fixing metal fitting 6.

When exchanging the ring type center cutter C in the inclined shaft excavator in this inclined shaft excavating machine, since the work is carried out while the excavation is performed in the upward direction, it is necessary to move the upper portion to the front of the cutter head D for exchange. It is impossible from the front) that the ground may collapse, and it will always be replaced from the inside.

As a conventional technique of this type, for example, the actual fairness 2
There is a device described in Japanese Patent Publication No. 34317/1989, and this device is shown in FIG.
As shown in the roller cutter mounting diagram, the roller cutter R provided on the front surface of the cutter head D is rotated to the inside of the machine to enable replacement from the inside of the machine. However, since this invention is intended to rotate the shaft Ra of the roller cutter R to replace it, the invention of this application aims to excavate an inclined shaft upward, such as an oblique excavator that excavates upward. The pressure is not always applied to the roller cutter R, and at the same time, it is not applied to the center cutter C which tends to drop downward due to its own weight so as to be exchangeable from the inside of the machine.

[0005]

By the way, in the center cutter C, the cutter holder itself has a sufficient strength so as to withstand the reaction force from the ground at the time of excavation. Depending on the number, it weighs several hundred kg (for example, about 500 kg), making it a heavy object that is difficult to handle even in a horizontal shaft.

This means that when excavating an inclined shaft upward, first, the cutter holder H is pulled down from the cutter head D to the inside of the machine to be removed. Handling heavy objects is very difficult to work with. This is also the case when the cutter holder H with the cutter replaced is pushed up to the cutter head D and returned to the original position, which is difficult to handle and extremely poor in workability.

In addition, when the cutter holder H is detached and pushed up, a worker works from below the cutter holder H, so it is necessary to take measures against the falling of the cutter holder H, which is a heavy object, from above (the direction of excavation). In addition, it is necessary that the cutter holder H falls and does not come off from the cutter head D, which makes handling much more difficult than in the case of the horizontal shaft as described above.

Further, since the center cutter C is fixed to the cutter holder H from the front side so as to withstand the reaction force from the ground at the time of excavation, in order to replace the center cutter C, the front side of the cutter holder H ( It is necessary to expose the center cutter fixed side) to the inside of the machine. For example, in a horizontal shaft, the cutter holder H can be pulled out from the inside of the machine, hung from the upper side and lowered, and then inverted after being placed in the lower position, and then lifted again and pushed in horizontally to restore the original. Although it is relatively easy to perform, in order to pull down and push up the cutter holder H in the slant shaft, it is necessary to move a heavy object diagonally while being suspended in the cutter head. It is necessary to reverse in the (not) state.

Further, as for the method of fixing the cutter holder H to the cutter head D, the fixing bolt is loosened by the impact acting on the center cutter C and the cutter holder H vibrates when the center holder C is vibrated by simply fixing it with the bolt. Since damage is expected to occur, for example, in horizontal shafts, it is necessary to take measures against loosening of bolts as in the case of taking measures against loosening of bolts using a wedge method such as a cotter.

In view of the above-mentioned problems, the inventions according to claims 1 to 3 among the inventions according to the present application provide a center cutter mounting structure for a slant excavator capable of efficiently exchanging the center cutter from the inside of the excavator during excavation of a slant shaft. It is an object of the present invention to provide a slant shaft excavator in which the cutter holder is divided into a plurality of pieces and the center cutter of each cutter holder is provided with the invention according to any one of claims 1 to 3. It is intended.

[0011]

In order to achieve the above object, a center cutter mounting structure for an inclined shaft excavator according to a first aspect of the present invention comprises a cutter head having a cutter holder equipped with a ring type center cutter in a central portion thereof. In the center cutter mounting structure of the inclined shaft excavator, shaft parts are provided at both ends of the cutter holder, guide members are provided on the cutter head, and the shaft parts of the cutter holder are slid on the guide members by a predetermined distance toward the inside of the excavator. The guide groove is formed so that the shaft portion is rotatable at the inner end of the guide groove.

As described above, the shaft portions provided at both ends of the cutter holder are slidable inside the machine along the guide grooves of the guide members provided on the cutter head by a predetermined distance, and the guide grooves are formed at the inner ends of the machine. When the center cutter is replaced by sliding the cutter holder along the guide groove to the inside of the machine for a predetermined distance by means of the rotatable shaft, the shaft part is locked to the inside end of the guide member to prevent falling. The front of the cutter head can be cut off from the ground and the front of the center cutter can be turned to the inside of the machine by turning it at the end of the guide groove, so it is easy to replace the center cutter from the inside of the machine. It becomes possible.

According to a second aspect of the present invention, there is provided a center cutter mounting structure for an inclined shaft excavator according to the first aspect, in which the shaft portion of the cutter holder is located at the tip end side of the guide groove and the inner end of the guide groove. The shaft of the cutter holder is fixed by providing a spacer that fits between the guide grooves in the guide groove.By providing a spacer that fits in the guide groove, a large excavation reaction force from the ground is obtained. Can be supported by a guide member provided integrally with the cutter head via this spacer.

According to a third aspect of the present invention, there is provided a center cutter mounting structure for an inclined shaft excavator according to the first or second aspect, wherein a fixing means for integrally fixing the spacer in the guide groove and the cutter holder to the cutter head is provided. By directly fixing the spacer and the cutter holder to the cutter head by the fixing means as described above, it is possible to reliably prevent the cutter holder from vibrating due to an impact during excavation. be able to.

The inclined shaft excavator according to claim 4 is an inclined shaft excavator equipped with a cutter head having a cutter holder equipped with a ring type center cutter in a central portion, and the cutter holder is divided into a plurality of cutter holders. Is equipped with a center cutter, and the plurality of cutter holders are provided with the center cutter mounting structure according to any one of claims 1 to 3. By thus dividing the cutter holders into a plurality of pieces, the number of center cutters in each cutter holder can be reduced, the weight of one cutter holder can be reduced, and the workability of center cutter replacement can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention according to the present application will be described below with reference to the drawings. FIG. 1 is a drawing showing a first step of removing the center cutter in the center cutter mounting structure according to this application, (a) is a front view, and (b) is a front view.
Is a side view. FIG. 2 is a drawing showing the second step,
(a) is a front view and (b) is a side view. FIG. 3 is a drawing showing the same third step, (a) is a front view and (b) is a side view. 4 is a drawing showing a cutter holder according to the present application, (a) is a plan view, and (b) is a side view of only a shaft portion. FIG. 5 is a front view showing an oblique excavator equipped with this center cutter mounting structure, and FIG. 6 is a side sectional view of the oblique excavator.

As shown in FIGS. 5 and 6, in this embodiment shows an example in which cutter holder H _1, H ₂ are provided three in a central portion of the cutter head D, and the center of the cutter holder H ₁ Is provided with three center cutters C, and each of the two cutter holders H ₂ is provided with two center cutters C. The center cutter C and the roller cutter R provided on the front face of the cutter head form a tunnel. Is configured to drill. In this way, the cutter holder H
By providing by dividing _1, H ₂ into a plurality, and reduce the weight of the cutter holder H _1, H _2.

[0018] Among these cutter holder H _1, H _2, when the cutter holder H ₁ of the central portion will be described below as an example, the cutter holder H ₁ FIG. 4 (a), as shown in (b), 3 pieces of A ring type center cutter C is provided, and each center cutter C is fixed to a cutter holder H ₁ by a center cutter fixing metal fitting 6 from the front side during excavation. A shaft portion 1 is provided at both ends of the cutter holder H ₁ , and the shaft portion 1 has a width dimension such that the shaft portion 1 can slide along a guide groove 2a of a guide member 2 provided on the cutter head side described later. It is formed by w ₁ . In this example, the shaft holders ₁ of the cutter holder H ₁ and the other cutter holders H ₂ are provided so as to be arranged substantially parallel to each other, and by disposing the shaft portions 1 substantially parallel to each other, all the center cutters C are arranged. It can be replaced by similar work.

On the other hand, a guide groove 2a is formed in the axial direction of the excavator T inside the guide member 2 which is integrally provided inside the machine from the cutter head D, and the cutter holder H ₁ is formed in the guide groove 2a. The shaft portion 1 is provided so as to be slidable while sliding. This is from the tip of the guide grooves 2a to a predetermined distance at a predetermined width w _2, the inboard end substantially the same arc of pivoting portion 2b and the shaft portion 1 to the shank 1 can be rotated is formed. The sliding of the cutter holder H ₁ in the guide groove 2a is carried out in the axial direction of the excavator T by the cutter holder H ₁ .
₁ and the width w ₁ and w ₂ such that the engagement of the extent possible be slid by human power is determined.

Further, since the cutter holder H ₁ is fixed while protruding toward the front side of the cutter head during excavation and receives the excavation reaction force from the natural ground during excavation, the cutter holder H ₁ is positioned at the tip of the guide groove 2a. In this state, the spacer 3 to be inserted into the guide groove 2a inside the machine is provided, and the cutter holder H ₁
The shaft portion 1 is fixed at a predetermined position of the cutter head D, and the excavation reaction force acting on the center cutter C is supported by the guide member 2, that is, the cutter head D from the shaft portion 1 via the spacer 3.

As shown in FIGS. 1 (a) and 1 (b), the spacer 3 is formed so that the width direction thereof is substantially the same as the width dimension w ₁ of the shaft portion 1, and the upper and lower sides are the arc of the shaft portion 1. It is formed by substantially the same arc, and the tip side is formed along the arc of the shaft portion 1 and the inside of the machine is formed along the arc of the rotating portion 2b. In this example, the through hole 3a is provided in the central portion of the spacer 3 to reduce the weight, and the handle 3b is provided to improve workability. Further, the spacers 3 are fixed to the cutter head D by bolts 4 (four in each of the left and right, totaling eight in total) for fixing to the cutter head D so as to be integrated with the cutter head D.

Further, a through hole 3c is also provided in the central excavator axial direction of the spacer 3, and the cutter holder H ₁ is inserted from the inside of the machine through the through hole 3c with the spacer 3 fitted in the guide groove 2a. 1a formed on the shaft of the
The spacer 3 and the cutter holder H ₁ are integrally fixed to the cutter head D by tightening the bolt 5 to the cutter head H ₁ to directly fix the cutter holder H ₁ and the cutter head D. Since the spacer 3 for fixing the cutter holder H ₁ to the cutter head D is fitted into the guide groove 2a, the bolt 5 is not easily affected by the loosening of the fixing bolt 4 of the spacer 3, so that In the example, the guide member 2 of the cutter head D penetrates the spacer 3 and is directly fixed by a single bolt 5 reaching the cutter holder H ₁ .

Since the bolts 5 have a structure that is not directly related to the retention of reaction force during excavation, the number of bolts 5 is reduced so that the cutters can be easily inspected and retightened when the cutter is inspected. The center cutter C is prevented from being damaged by the above, and the replacement work of the center cutter C including the removal of the spacer 3 can be efficiently performed. The bolt 5 may be a plurality of bolts or other fixing means, and is not particularly limited.

The center cutter replacement procedure by the center cutter mounting structure configured as described above is shown in FIGS. 1 (a) and 1 (b) to FIG.
The following is a description based on (a) and (b). 1 and 2
In FIG. 1, the right side of the center line of (a) shows the side surface of the cutter holder H _{1 and} the left side shows the cross section of the fixing bracket 6, and in FIGS. 1, 2 and 3, the right side of the center line of (b) is The cross section at the bolt 5 position is shown, and the left side shows the cross section at the bolt 4 position. Only Figure 3 (a) is in the opposite direction.

First, as shown in FIGS. 1 (a) and 1 (b), the bolt 5 for integrally fixing the cutter holder H ₁ to the cutter head D by penetrating the spacer 3 from the guide groove 2a of the cutter head D is removed. At the same time, after removing the plurality of bolts 4 that fix the spacer 3 to the cutter head D, the spacer 3 is removed from the guide groove 2a of the cutter head D.

Next, as shown in FIGS. 2 (a) and 2 (b), the cutter holder H ₁ is pulled down to the inner end (lowermost part) of the guide groove 2a, and the cutter holder H ₁ is supported by the inner end of the guide member 2. .

Then, as shown in FIGS. 3 (a) and 3 (b), 180 degrees centering on the shaft portions 1 provided at both ends of the cutter holder H ₁ .
The center cutter C and the center cutter fixing bracket 6 are exposed to the inside of the machine by rotating the center cutter C, and the center cutter C is removed to the inside of the machine by removing the center cutter fixing bracket 6. After that, a new center cutter C is attached and fixed by the center cutter fixing bracket 6, so that the cutter holder H ₁ is equipped with the new center cutter C.

After that, contrary to the above-mentioned removal, the cutter holder H ₁ is moved around the shaft portions 1 at both ends of the cutter holder 1 as a center.
It is rotated by 80 degrees to return to the original direction (forward direction), the cutter holder H ₁ is pushed up along the guide groove 2a, and the spacer 3
Is fixed to the cutter head D by bolts 4 are inserted into the guide groove 2a, and the cutter holder H ₁ and the cutter head D by tightening the bolts 5 from inboard end of the guide member 2 by penetrating the spacer 3 to the cutter holder H ₁ And are directly fixed, and the replacement work of the center cutter C is completed.

The cutter holder H ₁ holding the center cutter C is slid inside the machine along the guide groove 2a provided integrally with the cutter head D for a predetermined distance, and at the inner end of the machine, the cutter holder H ₁ is cut. Since the replacement work of the center cutter C is carried out in a state where the cutter holder H ₁ is securely supported, the replacement work can be carried out easily without worrying about the cutter holder H ₁ dropping.

In the above embodiment, since the shaft portions 1 of the three cutter holders H ₁ and H ₂ are provided substantially horizontally, the center cutters C mounted on the plurality of cutter holders are all the same. However, the number and orientation of the cutter holders may be in accordance with the diameter of the excavator, and are not particularly limited.

[0031]

The invention according to the present application is configured as described above, and has the following effects.

According to the center cutter mounting structure of the inclined shaft excavating machine according to claims 1 to 3, the center cutter can be replaced from the inside of the machine without manually supporting the cutter holder for heavy objects during the excavation of the inclined shaft. It becomes possible to easily perform the center cutter exchange work.

In particular, according to the center cutter mounting structure of the inclined shaft excavator according to the second aspect of the present invention, the spacer in the guide groove fitted into the guide groove provides the guide member with a large excavation reaction force from the natural ground. Since it can be supported by the cutter head through the above, it is possible to secure sufficient strength that can withstand the excavation reaction force with a simple configuration.

In particular, according to the center cutter mounting structure for an inclined shaft excavator according to the third aspect of the present invention, the spacer and the cutter holder are directly fixed to the cutter head by the fixing means, so that the impact and the like at the time of excavation can be achieved with a simple structure. Thus, it is possible to reliably prevent the cutter holder from vibrating.

According to the inclined shaft excavator according to the fourth aspect, the cutter holder is divided into a plurality of pieces, and the number of center cutters in each cutter holder is reduced to reduce the weight of one cutter holder. It becomes possible to construct an inclined shaft excavator with improved exchange workability.

[Brief description of the drawings]

FIG. 1 is a drawing showing a first step of the invention according to this application, in which (a) is a front view and (b) is a side view.

FIG. 2 is a drawing showing a second step of the invention according to this application, where (a) is a front view and (b) is a side view.

FIG. 3 is a drawing showing a third step of the invention according to this application, (a) is a front view, and (b) is a side view.

FIG. 4 is a drawing showing a cutter holder according to the present application, (a) is a plan view, and (b) is a side view of only a shaft portion.

FIG. 5 is a front view showing an inclined shaft excavator equipped with the invention according to this application.

FIG. 6 is a side sectional view showing an inclined shaft excavator equipped with the invention according to this application.

FIG. 7 is a diagram showing how a conventional roller cutter is mounted.

[Explanation of symbols]

1 ... Shaft part 2 ... Guide member 2a ... Guide groove 2b ... Rotating part 3 ... Spacer 3a ... Through hole 4 ... Bolt 5 ... Bolt 6 ... Center cutter fixing metal fitting D ... Cutter head C ... Center cutter R ... Roller cutter H ₁ , H ₂ ... Cutter holder T ... Excavator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideki Chihara Inventor Hideki Chihara 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Okumura Gumi Co., Ltd. (72) Kazunori Yamanaka 1-1-chome, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo No. 3 Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Shinji Hirayama 1-3 1-3 Higashikawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kawasaki Heavy Industries Co., Ltd. Kobe Head Office

Claims (4)

[Claims] 1. A center cutter mounting structure for an inclined shaft excavator, comprising a cutter head having a cutter holder equipped with a ring type center cutter in a central portion thereof, wherein shaft portions are provided at both ends of the cutter holder, and a guide member is provided on the cutter head. A guide groove is formed on the guide member for sliding the shaft portion of the cutter holder toward the inside of the excavator by a predetermined distance, and a rotating portion at which the shaft portion is rotatable is formed at an inner end of the guide groove. The center cutter mounting structure of the inclined shaft excavator characterized by the above. 2. With the shaft portion of the cutter holder positioned on the tip side of the guide groove, a spacer that fits between the shaft portion and the in-machine end of the guide groove is provided in the guide groove so that the shaft portion of the cutter holder is The center cutter mounting structure for an inclined shaft excavator according to claim 1, which is fixed. 3. The center cutter mounting structure for an inclined shaft excavator according to claim 1, further comprising fixing means for integrally fixing the spacer in the guide groove and the cutter holder to the cutter head. 4. An inclined shaft excavator equipped with a cutter head having a center type cutter holder equipped with a ring type center cutter, wherein the cutter holder is divided into a plurality of pieces and each cutter holder is equipped with a center cutter. An inclined shaft excavator, wherein a plurality of cutter holders are provided with the center cutter mounting structure according to any one of claims 1 to 3.