JPH10131676A - Cutter head assembling structure and cutter head assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cutter head assembling technique that can assemble a cutter head firmly at a site without impairing accuracy. SOLUTION: This cutter head assembling structure is so constituted as to assemble a cutter head for a shield machine provided with a cutter head body forming a natural ground cutting part, a ring-like bearing holder 6 concentrically fitted to a swing wheel 2 forming power transmission mechanism of a cutter head driving motor, and a plurality of beams 7 for connecting the cutter head body to the bearing holder 6 to support the cutter head body. In this case, cutter head assembling structure is composed of divided pieces formed by bisecting a connected body of a plurality of beams 7 and the bearing holder 6 in lateral symmetry by a dividing face 9 vertically dividing the center part of the beam 7, and the cutter head body formed separately from a plurality of divided pieces by a dividing face 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head body, a ring-shaped bearing holder for mounting concentrically to a turning wheel, and a plurality of cutter head bodies and a bearing holder for connecting the cutter head body and the bearing holder to support the cutter head body. TECHNICAL FIELD The present invention relates to a cutter head assembling structure for assembling a cutter head for a shield machine including a beam of a book and an assembling method of the cutter head.

[0002]

2. Description of the Related Art With respect to a cutter head for a shield machine, a support method is roughly classified into a center shaft support method in which a center portion of a cutter head body is supported by a center shaft serving as a rotation drive shaft, and an outer peripheral portion of the cutter head body. A peripheral support method that is supported by a cylindrical body having substantially the same shape as the shield body,
An intermediate beam support method in which an intermediate portion between the center portion and the outer peripheral portion of the cutter head body is supported by a plurality of beam members, and an outer beam support method in which the outer peripheral portion of the cutter head body is supported by a plurality of beams. The present invention seeks to improve the assembling technique of a beam support type cutter head for a shield machine which employs an intermediate beam support method or an outer beam support method among such support methods.

[0003] To facilitate understanding of the present invention,
The basic technical contents of the shield machine equipped with the beam supporting type cutter head will be described with reference to FIG. FIG.
FIG. 1 is a longitudinal sectional view of a shield machine in which a cutter head of an intermediate beam support type is installed, and is a view for explaining the present invention and a conventional technique.

In FIG. 4, reference numeral 1 denotes a shield body of a shield machine, 2 denotes a ring-shaped turning wheel serving as a power transmission mechanism of a cutter head driving motor 2a, and 3 denotes an outer space serving as a digging room and an inner space serving as a working room. A bulkhead 4 provided on the shield main body 1 so as to separate from the space, a cutter head 4 rotated by a cutter head driving motor 2a, and a cutter 5 mounted in front of the shield main body 1 to form a cutting portion of the ground G. A cutter head body 6 is a ring-shaped bearing holder concentrically mounted on the rotating side of the swivel 2, and a beam 7 supports the cutter head body 5 by connecting the cutter head body 5 and the bearing holder 6.

The revolving wheel 2 is mounted on the bulkhead 3 so as to form a concentric circle with the shield main body 1. External teeth meshing with a pinion 2b directly connected to a shaft of a cutter head driving motor 2a are provided on an outer peripheral portion thereof. It is formed and constitutes a reduction gear mechanism together with the pinion 2b. The reduction gear mechanism including the turning wheel 2 and the pinion 2b reduces the rotational force of the cutter head driving motor 2a and transmits the rotational force to the cutter head 4. The cutter head body 5 may be composed of an outer peripheral frame to which a number of bits are fixed and spokes, or may be composed of a face plate. A plurality of beams 7 are attached at substantially equal intervals in the circumferential direction of the bearing holder 6. In this example, the front ends of these beams 7 support an intermediate portion between the center portion and the outer peripheral portion of the cutter head main body 5, and a so-called intermediate beam supporting system is adopted. The cutter head 4 includes a cutter head body 5, a bearing holder 6, and a plurality of beams 7.

In this shield excavator provided with a cutter head of the intermediate beam supporting type, when the cutter head driving motor 2a is driven to rotate, the rotation is transmitted to the turning wheel 2 via the pinion 2b to reduce the speed of the turning wheel 2. Rotate.
Then, the rotation of the turning wheel 2 is transmitted to the cutter head 4 through the bearing holder 6 attached to the turning wheel 2, and the cutter head main body 5 rotates to excavate the ground. Thus, the bearing holder 6 of the cutter head 4
Is mounted on the slewing ring 2 and its rotation is transmitted. Therefore, the rear end surface serving as the mounting surface is formed so as to be flush with the mounting surface of the slewing wheel 2 and the accuracy of the mounting surface of the bearing holder 6 is improved. It is necessary to secure enough. Further, since the bearing holder 6 supports the cutter head main body 5 via the beam 7, it must maintain sufficient strength to support a load acting upon excavation of the ground G.
For this reason, conventionally, when a large cutter head having a large outer diameter of the shield body 1 is transported by land to a destination,
In particular, the bearing holder 6 has been integrally transported as a large-diameter ring without being divided even when it is desirable to divide the bearing holder 6 for land transportation. for that reason,
For example, a gantry is installed on a trailer and the bearing holder 6
In some cases, it was necessary to perform such an operation as placing the camera diagonally.

[0007]

In recent years, however, the diameter of shield excavators has been increasing more and more, and it is difficult to transport the bearing holder 6 on land with the bearing holder 6 as a single body only by devising such a transportation method. During the transportation,
In some cases, it is necessary to divide the pieces into a plurality of pieces in advance and carry them to the site before assembling them. In this case, since the bearing holder 6 is a structure requiring strength as described above, it must be joined by welding when assembling on site. However, bearing holder 6
Since the thickness is not so large and the joining surface cannot be made large, it is difficult in operation to weld the divided pieces so as to obtain a mounting surface that is flush with the mounting surface of the turning ring 2. In addition, if the joining surface cannot be made large in this way, the welding amount must be increased and the joint must be made firmly. If the welding amount is increased, the deformation of the bearing holder 6 after welding becomes more remarkable. It has been extremely difficult work to ensure sufficient accuracy of the mounting surface of the bearing holder 6. For this reason, it has been difficult for the conventional technique to assemble the cutter head firmly without losing accuracy. Such a problem is not limited to the above-described intermediate beam supporting type of cutter head in which the intermediate portion between the center portion and the outer peripheral portion of the cutter head body is supported by the beam, and the outer peripheral beam supporting method in which the outer peripheral portion of the cutter head main body is supported by the beam. This is also a problem that naturally occurs with the cutter head.

SUMMARY OF THE INVENTION The present invention is intended to solve the problem of the conventional on-site assembling of such a beam supporting type cutter head, and a cutter capable of assembling the cutter head firmly on site without deteriorating the accuracy. An object of the present invention is to provide a head assembling structure and a cutter head assembling method.

[0009]

SUMMARY OF THE INVENTION The technical problems of the present invention are as follows: 1) To install concentrically on a cutter head body forming a cutting portion of the ground and a turning wheel forming a power transmission mechanism of a motor for driving the cutter head. For assembling a cutter head for a shield machine with a ring-shaped bearing holder and a plurality of beams supporting the cutter head body by connecting the cutter head body and the bearing holder. An object is divided into a plurality of divided pieces formed by dividing a combined body of a plurality of beams and a bearing holder into at least two parts with a dividing surface that traverses a central portion of the beam, and separated from the plurality of divided pieces. And the cutter head main body formed as a whole. ''
2) a cutter head main body forming a cut portion of the ground, a ring-shaped bearing holder for concentric mounting on a turning wheel forming a power transmission mechanism of a cutter head driving motor, and a cutter head main body and a bearing holder. When assembling a cutter head for a shield machine with a plurality of beams that support the cutter head body by connecting the plurality of beams, a `` divided surface that cuts the combined body of the plurality of beams and the bearing holder vertically through the center of the beam Manufacturing at a factory a plurality of divided pieces formed by dividing at least into two and a cutter head main body formed separately from the plurality of divided pieces, and then a plurality of divided pieces and the cutter head main body. Is transported to the destination by transportation means, and thereafter, the plurality of divided pieces are welded to each other, and these divided pieces are welded to the cutter head body. And thereby assembling a cutter head for a shield machine. "

The invention of this application relating to the structure for assembling the cutter head of the above 1) employs the technical means of the above 1). Therefore, when assembling the cutter head for the shield machine, a plurality of cutter heads are required. Can be divided into a divided piece and a cutter head main body to be miniaturized and dividedly transported to a destination. In addition, when the cutter head is configured by being divided, particularly, the combined body of the plurality of beams and the bearing holder is divided by a dividing surface that vertically traverses the center of the beam. When welding together, not only the joint surface of the bearing holder but also the joint surface of the beam is used, but the large joint surface of the combined body of the beam and the bearing holder is abutted and fixed,
The bearing holder, which can be positioned and cannot originally have a large joint surface, can be welded in a stable state. Further, the welding of the divided pieces of the bearing holder is not performed locally on the limited joint surface of the bearing holder as described above, but is performed on the entire divided surface of the combined body including the joint surface of the beam on the extension thereof. By dividing the combined body, particularly, with a dividing plane that traverses the center of the beam,
Bending stress is less likely to act on the split surface of the beam. As a result, even if the welding amount when welding the split pieces of the combined body is relatively reduced, it is possible to perform welding so as to secure the strength of the bearing holder and further the beam, and furthermore, it is possible to weld the bearing holder. Later deformation can be suppressed,
It is also possible to ensure the accuracy of the mounting surface of the bearing holder. The operation of the invention relating to the structure for assembling the cutter head described in 1) above corresponds to the process of assembling the structure for assembling the cutter head, while the operation in 2) above.
The invention relating to the method of assembling the cutter head is nothing but the invention of the process of assembling the structure for assembling the cutter head of 1), and the invention of the method of assembling the cutter head of 2) also has the same effect as that described above. It works.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention relating to the cutter head assembling structure and the invention relating to the cutter head assembling method of the present application are both inventions having the same field of industrial application and the same problem to be solved. The underlying technical ideas are also the same. Therefore, a concrete example showing how the invention relating to the cutter head assembling structure of the present application is actually embodied will be described below with reference to FIGS. 1 to 3. Embodiments of each invention will be clarified. FIG. 1 is a cross-sectional view of a cutter head for illustrating a structure for assembling a cutter head according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a structure for assembling a cutter head according to an embodiment of the present invention. FIG. 3 is a side view of a main part near the cutter head for explaining a cutter head assembling structure according to an embodiment of the present invention. In FIGS. 1 to 3, the portions denoted by the same reference numerals as those in FIG. 4 represent the same portions as those in FIG. 4, and thus will not be described in detail in order to avoid redundant description.

A cutter head for a shield machine which is assembled using the cutter head assembling structure according to an embodiment of the present invention comprises: a cutter head main body 5 forming a cutting portion of a ground;
A ring-shaped bearing holder 6 for mounting concentrically to the revolving wheel 2 forming a power transmission mechanism of the cutter head driving motor 2a; and connecting the cutter head body 5 and the bearing holder 6 to each other so that the center of the cutter head body 5 is formed. This is similar to the cutter head 4 shown in FIG. 4 and includes a plurality of beams 7 that support the middle between the portion and the outer peripheral portion.
In this embodiment, the cutter head main body 5 is shown using, for convenience, a cutter spoke 10 to which a bit 5a is fixed. However, a cutter using a face plate may be used. Whether to use a configuration like
It does not directly relate to the essence of the present invention.

The characteristic technical contents of the structure for assembling the cutter head according to this embodiment will be described with reference to FIGS. 1 to 3. In this embodiment, the cutter head assembly for assembling the cutter head is described. In order to construct the structure, the cutter head 4 is firstly moved in a lateral direction at a connection point between the cutter head body 5 and the beam 7, that is, at a joint between the cutter spoke 10 and the beam 7, as shown in FIGS. Are divided into two by the dividing surface 8. In this case, in order to assemble the cutter head main body 5 locally, the individual cutter spokes 10 are separated into an inner peripheral side and an outer peripheral side during transportation. The state in which the cutter head body 5 is transported may be appropriately selected in design, and is not directly related to the technical problem of the present invention. On the other hand, as shown in FIG. 1, the bearing holder 6 and the plurality of beams 7 are bilaterally symmetrically divided into two by a vertical division surface 9 that vertically traverses each of the upper and lower beams 7 in a state of being joined by welding. I have. In this embodiment, the beam 7 has a rectangular cross-sectional shape. When the beam 7 is divided into two, as shown in FIG. It is formed at the position where it crosses vertically.

By the way, as shown in FIG. 3, while rotating the cutter head body 5 clockwise, for example,
When the ground G is excavated, the load 11 acts in the counterclockwise direction as the excavation reaction force on the cut-spoke 10, and the bending stress σ _B acts on the beam 7. In the vicinity, a large bending stress σ _B acts. In that case, the stress distribution acting on the beam 7 is as shown in FIG.
, And the bending stress σ _B becomes zero on the line of the neutral axis. However, when splitting the beam into two,
Since the central part is divided into two parts by a dividing surface that extends vertically, the bending stress σ _B does not substantially act on the dividing surface 8. Therefore, when the divided pieces of the beam 5 are welded to each other, it is not necessary to increase the welding amount.

When assembling the cutter head 4 for a shield machine using the cutter head assembling structure of the embodiment of the present invention, first, at a factory, a combined body of a plurality of beams 7 and a bearing holder 6 is assembled. A cutter head formed by dividing the beam 7 into two parts by a dividing surface 9 that traverses the center of the beam 7 and by dividing the beam 7 by the dividing surface 8 to be formed separately from the two divided parts. The main body 5 is manufactured in an appropriate state such that the cut spokes 10 are separated into an inner peripheral side and an outer peripheral side. Next, the plurality of divided pieces of the combined body of the beam 7 and the bearing holder 6 and the divided pieces of the cutter head body 5 are transported to the destination near the starting shaft by the transport means.
Is divided into these two divided pieces and the divided piece of the cutter head main body 5, so that it is possible to reduce the size and transport separately to the destination. Thereafter, the shield head 4 is assembled by welding the two divided pieces together and the cutter head body 5 assembled from the divided pieces and the divided pieces.

As described above, the bearing holder 6
Since the thickness is not so large and the joining surface cannot be made large, it has been a difficult task to weld the divided pieces so as to obtain a mounting surface that is flush with the mounting surface of the revolving wheel 2. Was. However, in the present embodiment, when the cutter head 4 is configured by being divided, in particular, the combined body of the plurality of beams 7 and the bearing holder 6 is divided by the dividing surface 9 that vertically crosses the center of the beam 7. Therefore, when the divided pieces of the bearing holder 6 are welded to each other, not only the joint surface of the bearing holder 6 but also the joint surface of the beam 7 are used, so that the combined body of the beam 7 and the bearing holder 6 is large. The joint surfaces can be fixed and positioned by abutting each other, so that the bearing holder 6, which originally cannot have a large joint surface, can be welded in a stable state. Further, welding of the divided pieces of the bearing holder 6
Thus, instead of performing locally on the limited joint surface of the bearing holder 6, the joint can be performed on the entire division surface 9 of the combined body including the joint surface of the beam 7 on an extension of the joint surface. In particular, since the combined body is divided by the division surface 9 that traverses the center of the beam 7, bending stress is less likely to act on the division surface 9 of the beam 7. As a result, even if the amount of welding when welding the divided pieces of the combined body is relatively reduced, it is possible to perform welding so that the strength of the bearing holder 6 and further the beam 7 can be ensured. The deformation of the bearing holder 6 after welding can be suppressed, and the accuracy of the mounting surface of the bearing holder 6 can be ensured. As described above, according to the present embodiment, the plurality of beams 7 and the bearing holder 6 are formed by dividing the combined body of the plurality of beams 7 and the bearing holder 6 into at least two parts by the dividing surface 9 that traverses the center of the beams 7. Since the divided pieces and the cutter head main body 5 formed separately from the plurality of divided pieces constitute a structure for assembling the cutter head, the cutter head 4 is formed.
It is possible to obtain a cutter head assembling structure and a cutter head assembling method that can assemble the head firmly without losing accuracy. As a result, when assembling the cutter head 4 for the shield excavator, the cutter head 4 can be divided into a plurality of divided pieces and the cutter head main body 5 to be miniaturized and transported separately to the destination. Not only is transport to the site easy, but also the cutter head 4 assembled on site is highly reliable in both accuracy and strength.

In the structure for assembling a cutter head according to the present embodiment, when the combined body of the beam 7 and the bearing holder 6 is divided by the division surface 9, the vertical division surface 9 for vertically cutting each of the upper and lower beams 7 is provided. Although the left and right beams are divided into two in a symmetrical manner, furthermore, the left and right beams 7 may be vertically and symmetrically divided into four by a vertical division surface that vertically traverses each of the beams 7.
The point is that the combined body of the plurality of beams and the bearing holder is divided into at least 2
What is necessary is just to divide.

[0018]

As will be apparent from the above description, the inventions of this application relating to the structure for assembling the cutter head and the method for assembling the cutter head are described in the sections 1) and "Means for Solving the Problems", respectively. Since the technical means shown in 2) is adopted, according to each of these inventions, the cutter head assembling structure and the cutter head assemblage which can assemble the cutter head firmly without losing accuracy. An assembly method is obtained. As a result, when assembling a cutter head for a shield machine, the cutter head can be divided into a plurality of divided pieces and a cutter head body, miniaturized and divided and transported to a destination, and the cutter head can be transported locally. Not only is it easier to use, but also the cutter head assembled on site is highly reliable in terms of both accuracy and strength.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cutter head illustrating a structure for assembling the cutter head according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part near the cutter head for describing a cutter head assembling structure according to an embodiment of the present invention;

FIG. 3 is a side view of a main part near the cutter head for describing a cutter head assembling structure according to an embodiment of the present invention;

FIG. 4 is a longitudinal sectional view of a shield machine in which a cutter head of an intermediate beam support type is installed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Slewing wheel 2a Cutter head drive motor 2b Pinion 3 Bulk head 4 Cutter head 5 Cutter head main body 5a Bit 6 Bearing holder 7 Beam 8 Cutter head main body and beam splitting surface 9 Bearing holder and beam splitting surface 10 Cutter Spoke 11 Load acting on cutter spoke 12 Stress distribution acting on beam

Claims (4)

[Claims] 1. A cutter head main body forming a cutting portion of a ground, a ring-shaped bearing holder for concentrically attaching to a turning wheel forming a power transmission mechanism of a cutter head driving motor, and a cutter head main body and a bearing. A cutter head assembling structure for assembling a shield excavator cutter head including a plurality of beams supporting a cutter head main body by connecting the holder and the plurality of beams, wherein a plurality of beams and a bearing holder are provided. The combined body is constituted by a plurality of divided pieces formed by dividing the combined body into at least two parts along a dividing surface that traverses a central portion of the beam, and a cutter head body formed separately from the plurality of divided pieces. An assembly structure for a cutter head, comprising: 2. A cutter head main body forming a cutting portion of the ground, a ring-shaped bearing holder for concentrically attaching to a turning wheel forming a power transmission mechanism of a cutter head driving motor, and a cutter head main body and a bearing. What is claimed is: 1. A method for assembling a cutter head for a shield machine including a plurality of beams for supporting a cutter head body by connecting a holder, the assembly comprising a plurality of beams and a bearing holder. A plurality of divided pieces formed by dividing the beam into at least two parts by a dividing surface that traverses a central portion of the beam, and a cutter head body formed separately from the plurality of divided pieces are manufactured at a factory. Next, the plurality of divided pieces and the cutter head main body are transported to a destination by a transportation means, and thereafter, the plurality of divided pieces and each of these divided pieces are A cutter head assembling method, wherein a cutter head for a shield machine is assembled by welding a cutter head body. 3. The cutter head assembling structure according to claim 1, wherein the plurality of beams are beams that support an intermediate portion between a central portion and an outer peripheral portion of the cutter head main body. 4. The beam as claimed in claim 1, wherein the plurality of beams are beams for supporting an outer peripheral portion of the cutter head body.
For assembling the cutter head.