TW202108871A - Shield tunnel boring machine and cutterhead for cutting obstacles capable of preventing overall contact between obstacles and hard cutters and having an ability to suppress cutter defects - Google Patents

Abstract

The present invention provides a shield tunnel boring machine, comprising: a plurality of obstacle cutterheads, which include a base material, and a plurality of hard cutters that are fixed to the base material in a state protruding further in the tunneling direction than the base material and are harder than the base material, for cutting underground obstacles; a cutter plate, which is provided with obstacle cutterheads in rotation along with the excavation; and a shield tunnelling excavation body, which is provided with a cutter plate at the front end of the excavation direction. The plurality of obstacle cutterheads are configured in such a manner that a plurality of hard cutters are arranged at intervals in the rotation direction of the cutter plate and located in the rotation direction of the cutterhead, in which the hard cutters located on the outermost side in the rotation direction of the cutterhead are arranged inwardly than the base materials located at both ends in the rotation direction of the cutterhead.

Description

Shield tunneling machine and cutter head for obstacle cutting

The invention relates to a shield tunneling machine and a cutter head for cutting obstacles, in particular to a shield tunneling machine capable of cutting underground obstacles and a cutter head for cutting obstacles.

In the past, there is a shield tunneling machine that can cut underground obstacles. For example, such a shield tunneling machine was invented in Japanese Patent No. 6487277.

In the above-mentioned Japanese Patent No. 6487277, a shield tunneling machine is invented, which includes an obstacle cutting tip that includes a base material and a plurality of superhard blades fixed to the base material. A plurality of superhard blades are arranged at intervals in the rotation direction of the cutter head. In order to make it easy to contact obstacles, the cutting head for obstacles is equipped with superhard inserts at both ends in the direction of rotation of the cutter head.

However, in the shield tunneling machine described in the above-mentioned Japanese Patent No. 6487277, since the superhard blades are arranged at both ends in the direction of rotation of the cutter head, it is easy to interact with the superhard blades in the entire range of the superhard blades at both ends. Obstacles touch, but there is a problem that the super-hard blades at both ends are easily damaged.

Prior art literature

Patent literature

Patent Document 1: Japanese Patent No. 6487277

(1) Technical problems to be solved

The present invention was made to solve the above-mentioned problems. An object of the present invention is to provide a shield tunneling machine and a cutter head for obstacle cutting that can suppress the defect of a hard blade.

(2) Technical solutions and beneficial effects

In order to achieve the above-mentioned object, the shield tunneling machine of the present invention is provided with a plurality of obstacle cutting bits, which include a base material, and are fixed to the base material in a state protruding in the tunneling direction than the base material, and are harder than the base material The cutter head is provided with a cutter head for cutting obstacles and rotates along with the excavation; and the main body of the shield tunneling machine is set at the front end of the excavation direction There is a cutter head, and a plurality of obstacle cutting heads are respectively configured such that a plurality of hard blades are arranged at intervals in the rotation direction of the cutter head, and are located at the outermost side of the rotation direction of the cutter head in the direction of rotation of the cutter head The hard blades are arranged inwardly than the base materials located at both ends of the rotation direction of the cutter head.

In the shield tunneling machine of the present invention, as described above, the hard blades located on the outermost side in the rotation direction of the cutter head are arranged inwardly than the base materials located at both ends of the cutter head in the rotation direction, so that the rotation of the cutter head In the direction, hard blades are not arranged at both ends of the cutting head for obstacles, and the two ends can be formed with a base material that is softer than hard blades (high toughness and not easy to be chipped). Therefore, the hard blade located on the outermost side in the rotation direction of the cutter head can be firmly clamped by the base material from both sides of the rotation direction, and the exposure of the hard blade can be suppressed, and the entire contact between the obstacle and the hard blade can be prevented. As a result, the defect of the hard blade can be suppressed. In addition, in the case where hard blades are arranged at both ends of the rotation direction of the cutter head as in the prior art, the hard blade (hereinafter referred to as the hard blade at the rear end) arranged at the rear end of the cutter head in the rotation direction and the obstacle When the object is in contact, a large force is applied to the hard blade at the rear end in the direction of rotation of the cutter head. Here, since the hard blade at the rear end is mainly supported only by the tensile force of the base material located forward in the direction of rotation of the cutter head, the hard blade at the rear end is easily peeled from the base material to the rear in the direction of rotation of the cutter head. . On the other hand, as in the present invention, the base material is used to firmly clamp the outermost hard blade in the rotation direction of the cutter head from both sides of the rotation direction, thereby effectively preventing the hard blade at the rear end from being damaged, or The hard blade is peeled from the base material.

In the above-mentioned shield tunneling machine, it is preferable that the cutter head for obstacle cutting has a first inclined surface provided on the outer peripheral side of both the base material and the hard blade in the radial direction of the cutter head, and the first inclined surface follows from the cutter The inner peripheral side in the radial direction of the disk is inclined toward the outer peripheral side from the tip in the tunneling direction to the opposite direction of the tunneling direction. According to this structure, compared with the case where the first inclined surface is not provided at the tip of the tip for obstacle cutting (when the tip is rectangular), the tip in the tunneling direction can be made thinner. As a result, it is possible to suppress the heat generation in the vicinity of the tip in the tunneling direction during cutting, and therefore it is possible to suppress the problem that the tool bit (hard insert) for obstacle cutting is easily broken. In addition, the first inclined surface is inclined from the tip of the tunneling direction to the opposite direction of the tunneling direction as the inner peripheral side of the radial direction is toward the outer peripheral side, so that the chips can flow along the first inclined surface, so that the The chips are taken into the chamber.

In this case, it is preferable that the plurality of hard blades have a flat surface that is provided at the tip of the tunneling direction in a manner continuous with the first inclined surface and is orthogonal to the tunneling direction. With this configuration, compared to the case of cutting obstacles with the tip having a surface inclined with respect to the direction of excavation, the use of a flat surface can increase the contact area of the hard insert with respect to the obstacle, thereby suppressing the concentration of stress on the hard surface. The problem with the blade. Therefore, the defect of the hard blade can be further suppressed.

In the above-mentioned structure in which the hard blade has a flat surface, preferably, the flat surfaces of the plurality of hard blades are arranged on the same plane. With this configuration, the flat surfaces of the plurality of hard blades can be arranged at the same position in the tunneling direction. Therefore, when the obstacle is cut, the plurality of hard blades can be brought into contact with the obstacle at the same time. Therefore, obstacles can be effectively cut.

In the above-mentioned shield tunneling machine, it is preferable that the cutter head for obstacle cutting has a pair of second inclined surfaces provided at both ends of the base material in the rotation direction of the cutter head, and the pair of second inclined surfaces follow from the cutter The inner side of the obstacle cutting bit in the rotation direction of the disk faces the both end sides, that is, the outer side, and the outer end surface of the hard insert located at the outermost side in the rotation direction of the cutter head is inclined in the opposite direction to the driving direction. With this configuration, the pair of second inclined surfaces provided at both ends of the base material in the rotation direction of the cutter head can suppress the problem of obstacles contacting the base material. As a result, the wear of the base material can be suppressed. In addition, it is possible to reduce the contact between the base material that does not contribute to cutting and the obstacle, and to suppress the decrease in the cutting performance of the cutting bit for obstacles.

In the above-mentioned shield tunneling machine, it is preferable that the cutter head for obstacle cutting has a concave portion provided on a surface on the inner circumferential side of the cutter head in the radial direction, and the concave portion is formed from the inner circumferential side of the cutter head in the radial direction toward the outer periphery. Side recessed, and concave shape along the rotation direction of the cutter head. With this configuration, when the obstacle cutting tip passes through the space created by cutting, the recessed portion of the shape along the rotation direction of the cutter head can be used to suppress the radius of the cutter head of the obstacle and obstacle cutting tip The inner peripheral side of the direction is in contact with the surface. That is, it is possible to avoid the obstacle by the cutting bit for obstacles by using the recessed portion. As a result, it is possible to suppress the force from the inner peripheral side to the outer peripheral side from acting on the cutter head for cutting obstacles, and therefore it is possible to further suppress the chipping of the hard insert.

In this case, it is preferable that the obstacle cutting bit is provided with a plurality of types in such a manner that the amount of depression of the recessed portion is gradually reduced from the inner peripheral side to the outer peripheral side in the radial direction of the cutter head. With this configuration, the amount of depression of the recess can be set to an appropriate value corresponding to the position of the cutter head in the radial direction, and therefore, it is possible to effectively suppress the obstacle from contacting the surface on the inner peripheral side. As a result, the defect of the hard blade can be further suppressed.

In the above-mentioned shield tunneling machine, preferably, the obstacle cutting bit is divided into stages with the number of hard blades included in one obstacle cutting bit as moving from the inner peripheral side to the outer peripheral side in the radial direction of the cutter head There are multiple types of ways to increase land. If configured in this way, the peripheral speed of the tool tip for obstacle cutting can be extremely fast (the amount of movement per unit time of the tool tip for obstacle cutting is extremely large), and the tool for obstacle cutting on the outer peripheral side of the cutter head in the radial direction The head is set with more hard blades. As a result, it is possible to effectively cut obstacles even on the outer peripheral side of the cutter head in the radial direction. In addition, the closer the position is to the outer peripheral side of the cutter head in the radial direction, the faster the peripheral speed of the obstacle cutting tip, and the more heat is generated due to friction with the obstacle, making the obstacle cutting tip The temperature rises. Therefore, the breaking resistance of the hard blade is significantly lower than that of the inner peripheral side. Therefore, by arranging more hard blades on the outer peripheral side of the cutter head in the radial direction as described above, redundancy can be improved.

The cutter head for obstacle cutting of the present invention is provided with a base material, which is provided on a cutter head that rotates with excavation, and a plurality of hard blades, which are fixed to the base material in a state protruding more in the direction of excavation than the base material, It is also harder than the base material, and the obstacle cutting tool head is composed of a plurality of hard blades arranged at intervals in the rotation direction of the cutter head, and located at the outermost side of the rotation direction of the cutter head in the direction of rotation of the cutter head The hard blades are arranged inwardly than the base materials located at both ends of the rotation direction of the cutter head.

The cutter head for obstacle cutting of the present invention is configured as described above, and it is possible to suppress the defect of the hard blade in the same manner as the shield tunneling machine described above.

Hereinafter, an embodiment will be described based on the drawings.

[Implementation Mode]

The shield tunneling machine 100 of the embodiment will be described with reference to FIGS. 1 to 8.

(The overall structure of the shield tunneling machine)

As shown in FIG. 1, the shield tunneling machine 100 includes a shield tunneling machine main body 1, a cutter head provided at the tip of the shield tunneling machine main body 1 in the tunneling direction, a plurality of obstacle cutting tools provided on the cutter head 2 The cutter head 3 and a plurality of cutter heads S for soil excavation.

Here, in each figure, the direction X1 indicates the tunneling direction of the shield tunneling machine 100, and the direction X2 indicates the opposite direction of the tunneling direction. In addition, the Z direction represents the vertical direction, and the Y direction represents the lateral direction (width direction) orthogonal to the X direction and the Z direction.

In addition, the rotation direction of the cutter head 2 is represented by RO, and the radial direction of the cutter head 2 is represented by RA. In addition, RA1 represents the radial direction of the cutter head 2 from the inner peripheral side to the outer peripheral side, and RA2 represents the opposite direction of RA1.

The cutter head 2 is configured to rotate around a central axis α extending along the excavation direction along with the excavation. In addition, the rotation of the cutter head 2 is configured to be able to switch between normal rotation and reverse rotation in accordance with the driving situation and the like. The shield tunneling machine 100 has a function of cutting and removing obstacles O existing on the tunneling path by the cutting head 3 for obstacles.

Obstacles O are H-shaped steel piles, reinforced concrete, etc. located underground. The shield tunneling machine 100 includes a dedicated obstacle cutting bit 3 for cutting the obstacle O. In addition, if the obstacle O exists in a soft foundation, when cutting the obstacle, the obstacle O may be retracted (moved) due to the obstacle cutting bit 3 contacting the obstacle O, and the cutting cannot be performed properly. . Therefore, when cutting obstacles in the case of a soft foundation, a foundation improvement project in which a chemical solution is injected into the foundation to reinforce the foundation is carried out in advance.

In the present embodiment, an example in which the shield tunneling machine 100 is a soil pressure shield tunneling machine is shown. In the earth pressure shield tunneling machine 100, the mud is injected into the chamber 11 and mixed with the excavated soil excavated by the cutter head 2, so that the excavated excavated soil becomes impermeable and plastic fluidity. soil. The excavated muck (soil) is filled in the chamber 11 and the dumping device 13. The shield tunneling machine 100 maintains the chamber 11 and the dumping device 13 filled with excavated muck (soil), and uses the thrust of the shield jack 12 to generate pressure in the chamber 11 to oppose the stratum soil side The pressure (earth pressure and groundwater pressure of the tunneling face). The shield tunneling machine 100 makes use of the balance of the excavation volume and the soil discharge volume to achieve pressure balance while simultaneously excavating.

(The structure of the main body of the shield tunneling machine)

As shown in FIG. 1, the shield tunneling machine main body 1 includes a main body 10, a chamber 11, a shield jack 12, and a soil discharge device 13.

The main body 10 is composed of a cylindrical front main body portion 10a and a rear main body portion 10b. The front main body portion 10a is a portion where the cutter head 2 is provided at the tip in the excavation direction, and the shield jack 12 is provided with a propelling force, and the cutter head 2 is used to excavate the stratum soil. The rear main body portion 10b is a part that forms the peripheral wall of the tunnel along with the excavation of the front main body portion 10a (advance in the X1 direction), and travels while arranging the sector segments SG on the wall surface by an assembling machine not shown. The internal space of the main body 10 is partitioned by the partition wall 14 into two spaces, the chamber 11 on the side of the excavation direction (X1 direction) and the work space WS on the opposite side of the excavation direction (the X2 direction side).

The cavity 11 is provided on the rear surface side (X2 direction side) of the cutter head 2. The chamber 11 is a space (earth tank) surrounded by the cutter head 2, the front main body portion 10 a, and the partition wall 14. The soil pressure in the chamber 11 and the pressure acting on the cutter head 2 from the side of the stratum soil are maintained in a substantially balanced state.

The shield jack 12 is configured to push the sector section SG backward (X2 direction) to advance the main body 10 (the shield tunneling machine 100). A plurality of shield jacks 12 are installed on the rear main body portion 10 b in a manner of being arranged along the circumferential direction of the main body 10.

The soil discharge device 13 is constituted by a screw conveyor. The soil discharge device 13 includes a cylindrical casing 13a arranged obliquely in the main body 10, and a screw 13b arranged in the casing 13a.

One end of the housing 13a is open and connected to the lower side of the chamber 11. The screw 13b is configured to impart a conveying force toward the other end opening of the housing 13a to the excavated muck taken in from the chamber 11 by rotating. The opening at the other end of the casing 13a is configured to be able to discharge dirt. A muck conveying device B (for example, a belt conveyor) is provided on the downstream side of the earth discharging device 13, and the muck conveying device B conveys the muck discharged from the earth discharging device 13 (the casing 13 a) to the outside. In addition, the soil discharge device 13 not only has the function of discharging the muck in the chamber 11, but also has the function of discharging the muck in the chamber 11 and adjusting the pressure in the chamber 11.

(The structure of the cutter head)

As shown in FIG. 2, the cutter head 2 is formed in a circular shape when viewed from the driving direction. The cutter head 2 is provided with a plurality of cutter heads 3 for obstacle cutting and a plurality of cutter heads S for soil excavation. Specifically, for example, the cutter head 3 for obstacle cutting and the cutter bit S for soil excavation are fixed to the front surface (the surface on the X1 direction side) to the cutter head 2 by welding. The cutter head 2 is configured to excavate stratum soil with the cutter head S for soil excavation by rotating around the central axis α. In addition, the cutter head 3 for obstacle cutting and the cutter head S for soil excavation may be fixed to the cutter head 2 by bolting instead of welding.

A switching mechanism (not shown) is provided on the cutter head 2, which switches the following two states by moving the obstacle cutting tool head 3 forward and backward in the X direction, and the two states are: The state where the obstacle O is cut by the cutter head 3 for obstacle cutting (obstacle cutting state) (refer to Fig. 3); and the state of the soil being excavated by the cutter head S for soil excavation (the state of soil excavation) . The switching mechanism is an actuator such as a jack that moves the obstacle cutting bit 3 in the front-rear direction (X direction).

Specifically, the switching mechanism is configured such that under normal conditions (soil excavation state), the tip of the obstacle cutting bit 3 is arranged on the opposite side of the excavation direction (X2 direction) than the tip of the soil excavating cutter S Side). That is, the switching mechanism is configured to normally arrange (retreat) the obstacle cutting bit 3 at a position retreat from the soil excavating bit S, thereby preventing (suppressing) the abrasion of the obstacle cutting bit 3.

In addition, the switching mechanism is configured to switch from the soil excavation state to the obstacle cutting state when encountering an obstacle O. That is, the switching mechanism is configured such that the tip (end in the X1 direction) of the obstacle cutting bit 3 is closer to the excavation direction (X1 direction) than the tip (the end in the X1 direction) of the soil excavation bit S Position moves. Thereby, the shield tunneling machine 100 can cut the obstacle O with the cutter head 3 for obstacle cutting.

The cutter head 2 includes: a plurality of (four) radial first spokes 20, a single rotation center 21, an annular outer peripheral ring 22, and a plurality of muck for taking the excavated muck into the cavity 11 The intake port 23 and a plurality of (four) radial second spoke parts 24.

The first spoke portion 20 extends linearly along the radial direction (RA direction) of the cutter head 2 from the inner peripheral side (central axis α) of the cutter head 2 toward the outer peripheral side. The plurality of (four) radial first spoke portions 20 are arranged in a cross shape when viewed from the tunneling direction (viewed from the X1 direction side). That is, the center line β1 of one side group of the two first spoke parts 20 arranged linearly and the center line β2 of the other side group of the two first spoke parts 20 arranged linearly are orthogonal to each other.

Viewed from the tunneling direction (viewed from the X1 direction side), the obstacle cutting bit 3 is arranged on the first spoke portion 20 along the center lines β1 and β2 (radius direction of the cutter head 2) of the first spoke portion 20 Mode setting. In addition, when viewed from the excavation direction (viewed from the X1 direction side), the first spoke portion 20 is provided with soil so as to sandwich the obstacle cutting bit 3 from both sides of the rotation direction (RO direction) of the cutter head 2 The main head S1 of the head S for body excavation.

The rotation center portion 21 is arranged on the center axis α. A plurality (four) of end portions on the inner peripheral side of the first spoke portion 20 are connected to the rotation center portion 21. A fishtail cutter head 21a is provided on the front surface of the rotation center part 21.

The outer peripheral ring 22 is arranged at the outermost peripheral position of the cutter head 2 (near the inner surface of the tunnel). The outer circumferential side ends of the first spoke portion 20 and the second spoke portion 24 are connected to the outer circumferential ring 22.

When viewed from the excavation direction (viewed from the X1 direction side), the leading bits S2 of the plurality of soil excavation bits S are arranged on the outer circumferential ring 22 to be aligned along the rotation direction of the cutter head 2 with a predetermined distance therebetween.

The second spoke portion 24 linearly extends from the inner peripheral side of the cutter head 2 toward the outer peripheral side in a radial direction of the cutter head 2. The second spoke portions 24 are respectively provided between the plurality (four) of the first spoke portions 20 in the rotation direction of the cutter head 2.

Viewed from the excavation direction (viewed from the X1 direction side), the leading bit S2 of the soil excavating bit S is located on the second spoke portion 24 along the center line γ of the second spoke portion 24 (the radial direction of the cutter head 2 ) Set the arrangement method. In addition, when viewed from the excavation direction (viewed from the X1 direction side), the second spoke portion 24 is provided with a cutter head S for soil excavation in such a manner that the preceding cutter S2 is sandwiched from both sides of the rotation direction of the cutter head 2 Main cutter head S1.

As shown in FIG. 1, as a mechanism for rotating the cutter head 2, a beam-shaped tool bar M1 extending in the X direction is provided on the rear surface side of the cutter head 2, an annular member M2, and a tool drive source M3.

The front end of the cutter bar M1 is attached to the cutter head 2 and the rear end is attached to the annular member M2. The annular member M2 is configured to be rotatable about the central axis α by a bearing supported on the partition wall 14 of the front main body portion 10a. The cutter head 2 is configured to be rotationally driven by a cutter drive source M3 via a cutter rod M1 and an annular member M2. The tool drive source M3 is arranged behind the partition wall 14, and is configured to apply a drive torque to the annular member M2 for rotational drive. That is, the cutter head 2, the cutter rod M1, and the annular member M2 are integrally rotated (turned) by the cutter drive source M3. The tool drive source M3 is constituted by, for example, a hydraulic motor.

(Structure of cutter head for obstacle cutting)

As shown in FIG. 2, a plurality of types of tool bits are provided in the tool bit 3 for cutting obstacles. Specifically, three types of cutter heads are provided in the cutter head 3 for obstacle cutting, namely: a first cutter head 4, a second cutter head 5, and a third cutter head 6. A plurality of first cutter head 4, second cutter head 5, and third cutter head 6 are respectively provided.

Among the three types of cutter heads, the first cutter head 4 is arranged on the innermost peripheral side in the radial direction (RA direction) of the cutter head 2. Among the three types of cutter heads, the third cutter head 6 is arranged on the outermost peripheral side in the radial direction of the cutter head 2. The second cutter head 5 is arranged between the first cutter head 4 and the third cutter head 6 in the radial direction of the cutter head 2.

The basic structures of the first cutter head 4, the second cutter head 5 and the third cutter head 6 are the same. The differences between the first cutter head 4, the second cutter head 5, and the third cutter head 6 mainly include the following two points.

As shown in Fig. 4, the first difference is that the obstacle cutting bit 3 is provided on the inner peripheral surface (43a, 53a, 63a) with the recessed portion (47, 57, 67) of the recessed portion (D1, D2) , D3) A plurality of types are provided so as to gradually decrease from the inner peripheral side toward the outer peripheral side in the radial direction of the cutter head 2. That is, the amount of depression D1 of the recess 47 of the first tip 4, the amount of depression D2 of the depression 57 of the second tip 5, and the amount of depression D3 of the depression 67 of the third tip 6 are in this order (according to the first tip 4, The order of the second cutter head 5 and the third cutter head 6) decreases.

The second difference lies in the fact that the obstacle cutting tool head 3 has a hard insert (42, 52, 62) included in one obstacle cutting tool head 3 as it goes from the inner peripheral side to the outer peripheral side in the radial direction of the cutter head 2 There are multiple types in a way that the number of) gradually increases. That is, at least the number of hard blades 62 of the third cutter head 6 is greater than the number of hard blades 42 of the first cutter head 4.

In addition, in each figure, in order to easily distinguish the hard blades 42, 52, and 62 from the base materials 41, 51, and 61, the hard blades 42, 52, and 62 are hatched (oblique lines), and the hatching does not indicate a cross section.

Hereinafter, first, the second cutter head 5 having four hard blades 52 will be described. After that, the third bit 6 having the same shape as the second bit 5 except that the amount of the concave portion 67 is different from that of the concave portion 57 will be described. Finally, the first bit 4 having two hard blades 42 will be described. Description.

<The structure of the second cutter head>

As shown in FIG. 2, a plurality of second cutter heads 5 are provided on each first spoke part 20 (three are provided for each). The plurality (three) of the first cutter heads 4 are arranged so as to be arranged at equal intervals on the center line β1 (β2).

As shown in Figures 5 and 6, the second tip 5 (the tip 3 for obstacle cutting) includes: a base material 51 (base material) and a plurality (four) of hard blades 52, which are compared to The base material 51 is fixed to the base material 51 in a state where it protrudes in the tunneling direction (X1 direction).

The base material 51 is formed of a material more tough than the hard blade 52. The base material 51 is formed of steel materials, such as S45C, for example. The hard blade 52 is formed of a material harder than the base material 51. The hard blade 52 is formed of, for example, cemented carbide.

When viewed from the tunneling direction (viewed from the X1 direction side), the second cutter head 5 is generally arranged such that the radial direction of the cutter head 2 is the short-side direction and the rotation direction (RO direction) of the cutter head 2 is the long-side direction. The multiple (four) hard blades 52 are arranged at intervals in the rotation direction of the cutter head 2.

The second bit 5 is not provided with hard blades 52 at both ends in the rotation direction of the cutter head 2, and the two ends of the second cutter head 5 in the rotation direction of the cutter head 2 are composed of only the base material 51. That is, the second cutter head 5 (each of the cutter heads 3 for cutting multiple obstacles) is configured such that, in the rotation direction of the cutter head 2, the hard blade 52 located on the outermost side of the rotation direction of the cutter head 2 is smaller than the hard blade 52 located on the cutter head 2. The base materials 51 at both ends in the rotation direction of the spool are arranged inwardly. In short, all the hard blades 52 of the second cutter head 5 are clamped from both sides by the base material 51 in the rotation direction of the cutter head 2.

That is, the second tip 5 (the tip 3 for obstacle cutting) is configured to firmly support the hard tip 52 from both sides in the rotation direction of the cutter head 2 by the base material 51, so that the hard tip 52 can be prevented from being damaged.

Both the inner peripheral surface 53a and the outer peripheral surface 53b extend in the tunneling direction. In addition, the surface on the side of the excavation direction extends in a direction intersecting the excavation direction.

The multiple (four) hard blades 52 extend substantially along the radial direction (RA direction) of the cutter head 2 and are arranged in parallel to each other. In addition, the hard blade 52 and the base material 51 are arranged such that their exposed outer surfaces are continuous without a step difference, and constitute a surface 53a on the inner peripheral side. In addition, the hard insert 52 and the base material 51 are arranged coplanar (arranged on the same plane) on the surface 53b on the outer peripheral side of the obstacle cutting bit 3.

The second bit 5 (the bit 3 for obstacle cutting) has a first inclined surface 54 provided on the outer peripheral side of both the base material 51 and the hard blade 52 in the radial direction of the cutter head 2.

The first inclined surface 54 is provided in the entire area of the second bit 5 in the rotation direction of the cutter head 2 (the longitudinal direction of the obstacle cutting bit 3 ). The first inclined surface 54 is inclined from the tip in the tunneling direction to the opposite direction of the tunneling direction as it moves from the inner peripheral side to the outer peripheral side in the radial direction of the cutter head 2. That is, the second bit 5 (the bit 3 for obstacle cutting) is formed such that the thickness in the radial direction of the cutter head 2 gradually becomes smaller (the tip end becomes thinner) as it goes in the tunneling direction.

As an example, the inclination angle of the first inclined surface 54 with respect to a surface (flat surface 55 described later) orthogonal to the tunneling direction is, for example, 20 degrees or more and less than 45 degrees. In addition, the inclination angle of the first inclined surface 54 with respect to the surface orthogonal to the excavation direction is more, for example, 25 degrees or more and less than 35 degrees. Furthermore, the inclination angle of the first inclined surface 54 with respect to the surface orthogonal to the tunneling direction is further, for example, about 30 degrees.

The first inclined surface 54 is formed by a hard blade-side first inclined surface 54a and a base material-side first inclined surface 54b, wherein the hard blade-side first inclined surface 54a is composed of a hard blade 52; the base material-side first inclined surface 54a The inclined surface 54b is composed of the base material 51. The hard blade side first inclined surface 54 a and the base material side first inclined surface 54 b are alternately arranged in the rotation direction (RO direction) of the cutter head 2. In addition, the hard blade side first inclined surface 54a protrudes in the tunneling direction by a predetermined distance from the base material side first inclined surface 54b (base material 51). As an example, the protrusion amount d of the hard blade-side first inclined surface 54a from the base material 51 in the tunneling direction is, for example, approximately 1.6 mm or more and 2.0 mm or less.

In addition, a plurality of (four) base material side first inclined surfaces 54b are (approximately) located on the same plane. In addition, the plurality of base material-side first inclined surfaces 54b are located (substantially) on the same plane except for the surfaces located at both ends.

In addition, with regard to the thickness in the short-side direction of the obstacle cutting tip 3 (the radial direction of the cutter head 2), the rigidity of the entire obstacle cutting tip 3, the deformation when cutting obstacles, and the relative The cutter head 2 is firmly fixed, for example, 60 mm or more. Here, as described above, the obstacle cutting bit 3 is formed by the first inclined surface 54 so that the tip end becomes gradually tapered toward the excavation direction. Thereby, the cutting amount of the bit 3 for obstacle cutting can be reduced.

As a result, the cutter head 3 for obstacle cutting can increase the breaking resistance of the hard insert 52 relatively. Specifically, the cutter head 3 for obstacle cutting performs work and generates heat in order to remove the obstacle. Therefore, the smaller the range of removal, the less heat is generated. In addition, the hard blade 52 reduces the resistance to breaking as the temperature rises. Therefore, by reducing the heat generation and reducing the temperature rise of the hard blade 52, the decrease in the breaking resistance of the hard blade 52 can be suppressed. As a result, the possibility of damage to the hard blade 52 can be reduced. In addition, by reducing the cutting amount of the cutter head 3 for cutting obstacles, cutting can be performed in an energy-saving manner.

The second cutter head 5 (obstacle cutting cutter head 3 (base material 51 and a plurality of hard inserts 52)) has the first inclined surface 54 (the end of the excavation direction) provided at the tip of the excavation direction so as to be continuous with the first inclined surface 54 (the end of the excavation direction). The flat surface 55.

The flat surface 55 extends in a direction substantially orthogonal to the driving direction.

The flat surface 55 is formed by a hard blade-side flat surface 55 a and a base material-side flat surface 55 b. The hard blade-side flat surface 55 a is formed by the hard blade 52 and the base material-side flat surface 55 b is formed by the base material 51. The hard blade side flat surface 55a and the base material side flat surface 55b are alternately arranged in the rotation direction of the cutter head 2. In addition, the hard blade side flat surface 55a protrudes in the tunneling direction from the base material side flat surface 55b by a predetermined distance (thickness). As an example, the hard blade side flat surface 55a protrudes 1.6 mm in the tunneling direction from the base material side flat surface 55b. In addition, the hard blade side flat surface 55a is an example of the "flat surface" in the claims.

In addition, a plurality of (four) hard blade-side flat surfaces 55a (approximately) are located (arranged) on the same plane. In addition, a plurality of (three) base material side flat surfaces 55b are (approximately) located (arranged) on the same plane. That is, the plurality of (four) hard blade side flat surfaces 55a and the plurality (three) of base material side flat surfaces 55b all extend in a direction (approximately) orthogonal to the driving direction (X direction). The end surfaces on both sides of the rotation direction of the hard blade-side flat surface 55a are exposed. In addition, the hard blade-side flat surface 55a is arranged closer to the X1 direction side than the base material-side flat surface 55b. That is, the hard blade side flat surface 55a and the base material side flat surface 55b are not continuous.

The second bit 5 (obstacle cutting bit 3) is configured such that all the hard blades 52 pass through the end surface on the front end side of the hard blade 52 in the traveling direction (rotation direction) of the obstacle cutting bit 3 Cutting. With this configuration, compared to the case where cutting is performed through the center and the rear side of the hard insert 52, the tensile stress acting on the hard insert 52 in the travel direction (rotation direction) of the obstacle cutting bit 3 can be reduced. In addition, in order to prevent the hard blade 52 from being damaged, both end surfaces of the hard blade 52 in the rotation direction are slightly chamfered.

The second bit 5 (the bit 3 for obstacle cutting) has a pair of second inclined surfaces 56 provided at both ends of the base material 51 in the rotation direction of the cutter head 2.

The pair of second inclined surfaces 56 extend from the hard blade 52 located at the outermost side in the rotation direction of the cutter head 2 from the inner side of the obstacle cutting bit 3 in the rotation direction of the cutter head 2 toward the both ends, that is, the outer side. The outer end face 52a is inclined in a direction opposite to the tunneling direction. The second inclined surface 56 is provided in the entire area of the second bit 5 in the radial direction (RA direction) of the cutter head 2 (the short side direction of the obstacle cutting bit 3 ).

As an example, the inclination angle of the second inclined surface 56 with respect to the surface (flat surface 55) orthogonal to the tunneling direction is, for example, 20 degrees or more and less than 45 degrees. In addition, the inclination angle of the second inclined surface 56 with respect to the surface orthogonal to the excavation direction is more, for example, 25 degrees or more and less than 35 degrees. Furthermore, the inclination angle of the second inclined surface 56 with respect to the surface orthogonal to the driving direction is further, for example, about 30 degrees.

The second inclined surface 56 is formed by an outer peripheral side portion 56a and an inner peripheral side portion 56b.

The outer peripheral side portion 56 a is a surface that functions as the first inclined surface 54 (overlaps the first inclined surface 54 ). The inner circumferential side portion 56b is arranged on the inner circumferential side of the outer circumferential side portion 56a in the radial direction of the cutter head 2. The inner peripheral side portion 56 b (the end in the driving direction) is continuous with the flat surface 55, on the other hand, the outer peripheral side portion 56 a is not continuous with the flat surface 55.

The second bit 5 (the bit 3 for obstacle cutting) has a recessed portion, and the recessed portion 57 is provided on the surface 53 a on the inner peripheral side in the radial direction of the cutter head 2.

The recess 57 is formed in a concave shape that is recessed from the inner peripheral side of the cutter head 2 in the radial direction toward the outer peripheral side and is along the rotation direction of the cutter head 2.

When viewed from the tunneling direction (viewed from the X1 direction side), the recess 57 is formed by connecting a plurality of flat surfaces along the rotation direction of the cutter head 2. The boundary between the plurality of flat surfaces is also the boundary between the hard blade 52 and the base material 51. That is, the recess 57 is not formed in a smooth arc shape.

As described above, the amount of depression D2 (refer to FIG. 4) of the concave portion 57 of the second bit 5 is larger than the amount of depression D3 (refer to FIG. 4) of the concave portion 67 of the third bit 6. In addition, the recessed amount D2 of the recessed portion 57 of the second bit 5 is smaller than the recessed amount D1 of the recessed portion 47 of the first bit 4 (see FIG. 4 ). That is, in the rotation direction of the cutter head 2, the curvature of the (virtual) arc along the inner surface of the recess 57 is smaller than the curvature of the (virtual) arc along the inner surface of the recess 47, and is greater than the curvature of the (virtual) arc along the inner surface of the recess 67. The (virtual) arc of the inner surface has a large curvature.

In addition, the recess 57 is not provided in the entire area of the surface 53 a on the inner peripheral side in the radial direction of the cutter head 2. Regarding the surface 53 a on the inner peripheral side in the radial direction of the cutter head 2, the portions on both end sides in the rotation direction of the cutter head 2 are formed as flat surfaces that are not recessed in the radial direction of the cutter head 2. That is, with regard to the surface 53 a on the inner peripheral side in the radial direction of the cutter head 2, the portions on both end sides in the rotation direction of the cutter head 2 are formed by surfaces orthogonal to the radial direction of the cutter head 2.

<The structure of the third cutter head>

As shown in FIG. 4, the third bit 6 has a concave portion 67, and as described above, except that the concave amount D3 of the concave portion 67 is different from the concave amount D2 of the concave portion 57 of the second bit 5, it has the same value as the second bit 5 same shape. Therefore, a brief description will be given below.

The third cutter head 6 (the cutter head 3 for obstacle cutting) includes: a base material 61 (base material), and a plurality (four) of hard blades 62, which are greater than the base material 61 in the tunneling direction (X1 direction). ) The protruding state is fixed to the base material 61.

As shown in FIG. 2, the third cutter head 6 is configured such that, in the rotation direction (RO direction) of the cutter head 2, the hard blade 62 located on the outermost side of the rotation direction of the cutter head 2 is higher than the hard blade 62 located in the rotation direction of the cutter head 2 The base materials 61 at both ends are arranged toward the inside. In short, all the hard blades 62 of the third cutter head 6 are clamped from both sides by the base material 61 in the rotation direction of the cutter head 2.

The third cutter head 6 is arranged on the outer peripheral side of the second cutter head 5 in the radial direction of the cutter head 2. The third cutter head 6 is provided with a plurality of (seven or eight each) on each of the first spoke parts 20. The plurality of third cutter heads 6 are arranged so as to be arranged at equal intervals on the center line β1 (β2).

A plurality of (four) hard inserts 62 (exposed outer surfaces) to cross the obstacle cutting bit 3 on the inner peripheral side surface 63a, the tunneling direction side surface (flat surface 65), the outer peripheral side surface 63b Mode configuration.

The third bit 6 (the bit 3 for obstacle cutting) has a first inclined surface 64 provided on the outer peripheral side of both the base material 61 and the hard blade 62 in the radial direction of the cutter head 2.

The third cutter head 6 (obstacle cutting cutter head 3 (base material 61 and a plurality of hard inserts 62)) has the first inclined surface 64 (the end of the excavation direction) provided at the tip of the excavation direction so as to be continuous with the first inclined surface 64 (the end of the excavation direction) The flat surface 65.

The third bit 6 (the bit 3 for obstacle cutting) has a pair of second inclined surfaces 66 provided at both ends of the base material 61 in the rotation direction of the cutter head 2.

<The structure of the first cutter head>

As shown in FIG. 2, a plurality (two) of the first cutter head 4 is provided on the front surface of the rotation center portion 21. The two first cutter heads 4 are arranged at symmetrical positions on the center line β1 with respect to the center line β2.

As shown in FIG. 7, the first tool bit 4 (the tool bit 3 for obstacle cutting) includes a base material 41 (base material) and a plurality (two) of hard blades 42 which are higher than the base material 41. The state protruding in the tunneling direction (X1 direction) is fixed to the base material 41.

The multiple (two) hard blades 42 are arranged at intervals in the rotation direction of the cutter head 2. In addition, the multiple (two) hard blades 42 are not arranged in parallel to each other like the multiple (four) hard blades 42 of the second bit 5. That is, when viewed from the tunneling direction (viewed from the X1 direction side), the plurality (two) of hard blades 42 are arranged (arranged in a figure eight shape) so as to be separated from each other toward the outer peripheral side of the cutter head 2 in the radial direction.

Here, compared with the case where the plurality (two) of the hard blades 42 of the first cutter head 4 are arranged parallel to each other and observed, when viewed from the tunneling direction (viewed from the X1 direction side), the plurality (two) are arranged in the above-mentioned figure eight shape. A) In the case of the hard blade 42, the angle of the corner on the inner peripheral side of the hard blade 42 becomes blunt. That is, the hard blade 42 is not easily damaged. In addition, the second blade head 5 and the third blade head 6 may also have the hard blade 42 arranged in a figure eight shape similarly to the first blade head 4.

As an example, the length of the first cutter head 4 in the longitudinal direction (the length of the cutter head 2 along the rotation direction) is about two-thirds of the length of the second cutter head 5 in the longitudinal direction (refer to FIG. 4 ).

The first cutter head 4 (each of the cutter heads 3 for cutting a plurality of obstacles) is configured such that, in the rotation direction of the cutter head 2, the hard blade 42 located on the outermost side of the rotation direction of the cutter head 2 is smaller than that of the cutter head 2 The base materials 41 at both ends of the direction are arranged toward the inside. In short, all the hard blades 42 of the first cutter head 4 are clamped and supported from both sides by the base material 41 in the rotation direction of the cutter head 2.

A plurality of (two) hard inserts 42 (exposed outer surfaces) to cross the obstacle cutting bit 3 on the inner peripheral side surface 43a, the tunneling direction side surface (flat surface 45), the outer peripheral side surface 43b Mode configuration.

The first bit 4 (the bit 3 for obstacle cutting) has a first inclined surface 44 provided on the outer peripheral side of both the base material 41 and the hard insert 42 in the radial direction (RA direction) of the cutter head 2.

The first cutter head 4 (obstacle cutting cutter head 3 (base material 41 and a plurality of hard inserts 42)) has the first inclined surface 44 (end of the excavation direction) provided at the tip end in the excavation direction so as to be continuous with the first inclined surface 44 (the end of the excavation direction) The flat surface 45.

The first bit 4 (the bit 3 for obstacle cutting) has a pair of second inclined surfaces 46 provided at both ends of the base material 41 in the rotation direction of the cutter head 2.

The first bit 4 has a recess 47 provided on the surface 43 a on the inner peripheral side in the radial direction of the cutter head 2.

(The arrangement of the cutter head for cutting obstacles in the radial direction of the cutter head)

8, the arrangement of the cutter head 3 for obstacle cutting in the radial direction (RA direction) of the cutter head 2 (refer to FIG. 2) will be described.

Viewed from the tunneling direction (viewed from the X1 direction side), the plurality of obstacle cutting bit 3 is configured to be able to cut (approximately) the entire portion of the obstacle O (see FIG. 2) overlapping with the cutter head 2.

That is, the plurality of obstacle cutting bit 3 is continuously arranged without gaps in the radial direction of the cutter head 2. Specifically, in the radial direction of the cutter head 2, a plurality of obstacle cutting tips 3 on the center line β1 and a plurality of obstacle cutting tips 3 on the center line β2 are alternately arranged without gaps. In addition, in the radial direction of the cutter head 2, a plurality of obstacle cutting tips 3 on the center line β1 and a plurality of obstacle cutting tips 3 on the center line β2 may overlap each other.

In short, the shield tunneling machine 100 (refer to FIG. 2) is configured such that when the cutter head 2 is rotated, the inner peripheral side (outer peripheral side) surface and the center line of the plurality of obstacle cutting bits 3 on the center line β1 The surfaces on the outer peripheral side (inner peripheral side) of the cutting tip 3 for a plurality of obstacles on β2 pass substantially overlapping positions. In other words, the cutter head 3 for cutting a plurality of obstacles is arranged so that when the cutter head 2 is rotated, an uncut part will not be generated between the cut parts, and the cutting surface of the obstacle O will not be generated. A step difference is generated on the upper side, so that the entire cutting surface of the obstacle O can be cut uniformly.

(Effects of implementation)

In this embodiment, the following effects can be obtained.

In the present embodiment, as described above, the hard blade 42 (52, 62) located at the outermost side in the rotation direction of the cutter head 2 is compared with the base material 41 (51) located at both ends of the rotation direction (RO direction) of the cutter head 2. , 61) The hard blades 42 (52, 62) are arranged close to the inside so that the hard blades 42 (52, 62) are not arranged at both ends of the obstacle cutting head 3 in the rotation direction of the cutter head 2, and the hard blades 42 (52, 62) can be used. ) Soft (high toughness and not easy to be damaged) base material 41 (51, 61) forms the two ends. Therefore, the hard blade 42 (52, 62) located on the outermost side in the rotation direction of the cutter head 2 can be firmly clamped by the base material 41 (51, 61) from both sides of the rotation direction, and the hard blade 42 ( 52, 62) is exposed to prevent the obstacle O from contacting the entire hard blade 42 (52, 62). As a result, it is possible to suppress the defect of the hard blade 42 (52, 62). In addition, in the case where hard blades are arranged at both ends of the rotation direction of the cutter head as in the prior art, the hard blade (hereinafter referred to as the hard blade at the rear end) arranged at the rear end of the cutter head in the rotation direction and the obstacle When the object is in contact, a large force is applied to the hard blade at the rear end in the direction of rotation of the cutter head. Here, since the hard blade at the rear end is mainly supported only by the tensile force of the base material located forward in the direction of rotation of the cutter head, the hard blade at the rear end is easily peeled from the base material to the rear in the direction of rotation of the cutter head. . On the other hand, as in this embodiment, the hard blade 42 (52, 62) located at the outermost side in the rotation direction of the cutter head 2 is firmly clamped by the base material 41 (51, 61) from both sides in the rotation direction. This can effectively prevent the hard blade 42 (52, 62) at the rear end from being chipped or the hard blade 42 (52, 62) peeling from the base material 41 (51, 61).

In this embodiment, as described above, the obstacle cutting bit 3 has both the base material 41 (51, 61) and the hard insert 42 (52, 62) in the radial direction (RA direction) of the cutter head 2. The first inclined surface 44 (54, 64) is provided on the outer peripheral side, and the first inclined surface 44 (54, 64) moves from the tip of the tunneling direction to the tunneling direction from the inner peripheral side of the cutter head 2 in the radial direction toward the outer peripheral side Tilt in the opposite direction. Thereby, compared with the case where the 1st inclined surface 44 (54, 64) is not provided in the front-end|tip of the cutter head 3 for obstacle cutting (when the front-end|tip is made into a rectangular shape), the front-end|tip in a driving direction can be made thinner. As a result, it is possible to suppress the heat generation in the vicinity of the tip in the tunneling direction during cutting, and therefore it is possible to suppress the problem that the cutter head 3 (hard insert 42 (52, 62)) for obstacle cutting is easily broken. In addition, the first inclined surface 44 (54, 64) is inclined from the tip of the tunneling direction to the opposite direction of the tunneling direction as the inner peripheral side of the radial direction is toward the outer peripheral side, so that the chips can be moved along the first inclined surface 44. (54, 64) Flow, so the chips can be taken into the chamber effectively.

In the present embodiment, as described above, the plurality of hard blades 42 (52, 62) have the tip end in the driving direction so as to be continuous with the first inclined surface 44 (54, 64), and are substantially orthogonal to the driving direction. The flat surface 45 (55, 65). Thus, compared with the case where the obstacle O is cut by the tip having the surface inclined with respect to the tunneling direction, the flat surface 45 (55, 65) can make the hard insert 42 (52, 62) face the obstacle O. The contact area is relatively large, so that the problem of stress concentration on the hard blade 42 (52, 62) can be suppressed. Therefore, it is possible to further suppress the defect of the hard blade 42 (52, 62).

In this embodiment, as described above, the respective hard blade-side flat surfaces 55a of the plurality of hard blades 52 (42, 62) are arranged on substantially the same plane. According to this configuration, the hard blade-side flat surfaces 55a of the plurality of hard blades 52 (42, 62) can be arranged at substantially the same position in the tunneling direction. Therefore, when cutting the obstacle O, the plurality of hard blades can be used. 52 (42, 62) is in contact with obstacle O at the same time. Therefore, the obstacle O can be effectively cut.

In this embodiment, as described above, the obstacle cutting bit 3 has a pair of second inclined surfaces 46 (56, 66), the pair of second inclined surfaces 46 (56, 66) move from the inside of the cutter head 3 for cutting obstacles in the rotation direction of the cutter head 2 toward the both ends, that is, the outside, from the rotation of the cutter head 2 The outer end surface (52a) of the hard blade 42 (52, 62) on the outermost side of the direction is inclined in the direction opposite to the tunneling direction. Thus, the pair of second inclined surfaces 46 (56, 66) provided at both ends of the base material 41 (51, 61) in the rotation direction of the cutter head 2 can suppress the obstacle O and the base material 41 (51). , 61) The problem of contact. As a result, it is possible to suppress the wear of the base material 41 (51, 61). In addition, it is possible to reduce the contact of the base material 41 (51, 61) that does not contribute to cutting with the obstacle O, and to suppress the decrease in the cutting performance of the cutting tool bit 3 for obstacle cutting.

In this embodiment, as described above, the obstacle cutting bit 3 has recesses 47 (57, 67) provided on the inner peripheral surface 43a (53a, 63a) of the cutter head 2 in the radial direction, and the recess 47 (57, 67) is formed into a concave shape that is recessed from the inner peripheral side of the cutter head 2 in the radial direction toward the outer peripheral side and is along the rotation direction of the cutter head 2. As a result, when the tool head 3 for obstacle cutting passes through the space created by cutting, the recesses 47 (57, 67) having a shape along the rotation direction of the cutter head 2 can be used to suppress the obstacle O and the obstacle cutting tool. The surface 43a (53a, 63a) of the inner peripheral side of the radial direction of the cutter head 2 of the cutter head 3 contacts. That is, the recessed portion 47 (57, 67) can make the bit 3 for cutting an obstacle avoid the obstacle O. As a result, it is possible to suppress the force from the inner peripheral side to the outer peripheral side from acting on the obstacle cutting bit 3, and therefore it is possible to further suppress the defect of the hard insert 42 (52, 62).

In this embodiment, as described above, the obstacle cutting bit 3 is such that the amount of recession of the recesses 47, 57, and 67 is gradually reduced from the inner peripheral side in the radial direction of the cutter head 2 toward the outer peripheral side. There are multiple types of mode settings. As a result, the amount of depression of the recesses 47, 57, and 67 can be set to an appropriate value corresponding to the position of the cutter head 2 in the radial direction. Therefore, the obstacle O and the inner peripheral surfaces 43a, 53a, and 63a can be effectively suppressed. contact. As a result, it is possible to further suppress the defect of the hard blades 42, 52, and 62.

In the present embodiment, as described above, the obstacle cutting tip 3 has a hard insert 42 included in one obstacle cutting tip 3 as it goes from the inner peripheral side in the radial direction of the cutter head 2 toward the outer peripheral side. There are multiple types in such a way that the numbers of 52 and 62 are gradually increased. As a result, it is possible to cut obstacles on the outer peripheral side in the radial direction of the cutter head 2 with a particularly fast peripheral speed (the amount of movement per unit time of the obstacle cutting bit 3 is particularly large) for the obstacle cutting tool tip 3 The cutter head 3 is provided with more hard blades 42, 52 and 62. As a result, even on the outer peripheral side of the cutter head 2 in the radial direction, the obstacle O can be effectively cut. In addition, the closer the position is to the outer peripheral side of the cutter head 2 in the radial direction, the faster the circumferential speed of the obstacle cutting tool head 3, and the more heat is generated due to the friction with the obstacle O, which makes the obstacle cut The temperature of the cutter head 3 rises. Therefore, the breaking resistance of the hard blade 42 (52, 62) is significantly lower than that of the inner peripheral side. Therefore, by arranging more hard blades 42 (52, 62) on the outer peripheral side of the cutter head 2 in the radial direction as described above, redundancy can be improved.

[Modifications]

In addition, it should be understood that the embodiments and modified examples of the present invention are merely illustrative in every respect and not restrictive. The scope of the present invention is shown not by the description of the above-mentioned embodiments but by the claims, and includes all modifications (modifications) equivalent to the meaning of the claims and within the scope.

For example, in the above-mentioned embodiment, the example in which the present invention is applied to the earth pressure shield tunneling machine is shown, but the present invention is not limited to this. The invention can also be applied to a mud-water shield tunneling machine. In the case of the mud-water shield tunneling machine, muddy water is fed into the chamber to liquefy the excavated muck slurry, and the excavated muck slurry is discharged from the dumping device.

In addition, in the above-mentioned embodiment, an example is shown in which three types (three types: the first bit, the second bit, and the third bit) are provided on the cutter head for cutting obstacles, but the present invention is not limited to this. In the present invention, one, two, or four or more obstacle cutting tool bits may be provided on the cutter head.

In addition, in the above-described embodiment, an example in which an obstacle cutting tip is provided on the spokes of the cutter head is shown, but the present invention is not limited to this. In the present invention, an obstacle cutting tip may be provided on the face plate of the cutter head or the like.

In addition, in the above-mentioned embodiment, only an example of arranging a plurality of cutter heads for obstacle cutting to the cutter head is shown, and the present invention is not limited to this.

In addition, in the above-mentioned embodiment, the example in which the inclined surface (first inclined surface) is provided on the outer peripheral side in the radial direction of the cutter head is shown, but the present invention is not limited to this. In the present invention, an inclined surface may be provided on the inner peripheral side in the radial direction of the cutter head.

In addition, in the above-mentioned embodiment, the example in which the front surface of the cutter head is formed into a flat shape is shown, but the present invention is not limited to this. In the present invention, the central portion of the cutter head may be formed into a vertebral body shape that protrudes forward (in the direction of excavation).

In addition, in the above-mentioned embodiment, an example in which two or four hard inserts are provided to one obstacle cutting bit is shown, but the present invention is not limited to this. In the present invention, three or more hard blades may be provided for one obstacle cutting bit.

In addition, in the above-described embodiment, an example in which a plurality of hard blades of the second bit (third bit) are arranged in parallel is shown, but the present invention is not limited to this. In the present invention, the plurality of hard blades of the second tip (third tip) may be arranged non-parallel. For example, like the first cutter head, a plurality of hard blades of the second cutter head (third cutter head) may be arranged so as to be separated from each other from the inner peripheral side to the outer peripheral side of the cutter head (in a figure eight shape). .

In addition, in the above-mentioned embodiment, an example is shown in which the tip (flat surface) of each hard insert included in one obstacle cutting bit is located on the same plane, but the present invention is not limited to this. In the present invention, the tip (flat surface) of each hard insert included in one obstacle cutting bit may be arranged at a position shifted in the tunneling direction.

In addition, in the above-mentioned embodiment, viewed from the side of the excavation direction, a plurality of flat surfaces are connected along the rotation direction of the cutter head to form the recessed portion of the obstacle cutting bit. However, the present invention is not limited to this. In this invention, the recessed part of the cutter head for obstacle cutting may be formed in an arc shape so that it may follow the rotation direction of a cutter head viewed from the excavation direction side.

In addition, in the above-mentioned embodiment, an example in which a plurality of obstacle cutting bits are arranged at equal intervals in the radial direction of the cutter head is shown, but the present invention is not limited to this. In the present invention, in the radial direction of the cutter head, a plurality of cutter heads for obstacle cutting may be arranged so as to gradually increase or decrease the interval toward the outer peripheral side.

In addition, in the above-mentioned embodiment, the example in which the hard blade is formed of cemented carbide is shown, but the present invention is not limited to this. In the present invention, the hard blade may be formed of a material harder than the base material, such as tool steel. In addition, cemented carbide is a brittle material, while tool steel is more ductile than cemented carbide and is not a brittle material.

In addition, in the above-mentioned embodiment, the example in which the recessed part is provided in the whole area of the excavation direction (X direction) to the cutter head for obstacle cutting is shown, but this invention is not limited to this. In the present invention, in the excavation direction (X-direction), the recess may be provided only in the range where the hard blade is present on the cutter head for cutting obstacles.

In addition, in the above-mentioned embodiment, an example is shown in which the exposed outer surfaces of the hard insert and the base material are arranged continuously on the inner peripheral side of the obstacle cutting tip, but the present invention The invention is not limited to this. In the present invention, like the obstacle cutting tip 203 of the modified example shown in FIG. 9, the obstacle cutting tip 203 may be arranged on the inner peripheral surface 253a so as to generate a step ST. The exposed outer surfaces of the hard blade 52 and the base material 251 respectively. For example, the inner peripheral surface 253a of the base material 251 sandwiched by the hard blade 52 may be formed to extend in a direction substantially orthogonal to the radial direction of the cutter head, and the hard blade 52 and the base material 251 Set a slight step difference ST between. By forming the base material 251 in this way, it is possible to easily manufacture the cutter head 203 for obstacle cutting.

100: shield tunneling machine 1: The main body of the shield tunneling machine 10: main body 10a: Front main body 10b: Rear main body 11: Chamber 12: Shield jack 13: Dumping device 13a: shell 13b: Screw 14: next wall 2: cutter head 20: The first spoke 21: Rotation center 21a: Fishtail knife head 22: outer ring 23: Muck intake 24: second spoke 203: cutter head for obstacle cutting 251: base material 253a: The inner side surface 3: cutter head for obstacle cutting 4: The first cutter head 41: base material 42: Hard blade 43a: The inner side surface 43b: Surface on the outer peripheral side 44: The first inclined plane 45: flat surface 46: second inclined surface 47: recess 5: The second cutter head 51: base material 52: Hard blade 52a: Outer end face 53a: The inner side surface 53b: Surface on the outer peripheral side 54: The first inclined surface 54a: The first inclined surface of the hard blade side 54b: The first inclined surface on the base metal side 55: flat surface 55a: Flat side of hard blade 55b: Flat surface of base metal side 56: second inclined surface 56a: Outer peripheral part 56b: Inner peripheral part 57: recess 6: The third cutter head 61: base material 62: Hard blade 63a: The inner side surface 63b: Surface on the outer peripheral side 64: The first inclined plane 65: flat surface 66: second inclined plane 67: recess 500-500: auxiliary line B: Muck conveying device D1: Depression D2: Depression D3: Depression M1: Tool bar M2: Ring part M3: Tool drive source O: Obstacle RA: Radial direction RA1: Radial direction RA2: Radial direction RO: rotation direction S: Cutter head for soil excavation S1: Main cutter head S2: Leading head SG: sector segment ST: Step difference WS: Work space X: direction X1: direction X2: direction Y: direction Z: direction d: the amount of protrusion α: central axis β1: Centerline β2: Centerline γ: Centerline

Fig. 1 is a schematic longitudinal sectional view of a shield tunneling machine according to an embodiment.

Fig. 2 is a schematic front view of the shield tunneling machine of the embodiment viewed from the tunneling direction side (front side).

Fig. 3 is a cross-sectional view taken along line 500-500 of Fig. 2.

Fig. 4 is a diagram for comparing the amount of depression of the concave portion of the three types of obstacle excavating cutter heads according to the embodiment.

Fig. 5 is a perspective view of a second cutter head (a cutter head for obstacle digging) according to the embodiment.

Fig. 6 is a three-dimensional view showing the second cutter head (the cutter head for obstacle digging) of the embodiment from three directions.

Fig. 7 is a three-dimensional view showing the first cutter head (the cutter head for obstacle digging) of the embodiment from three directions.

Fig. 8 is a schematic diagram for explaining the arrangement of the cutter head for digging obstacles in the radial direction of the cutter head of the embodiment.

Fig. 9 is a view of a cutter head for obstacle excavation of a modification as viewed from the side in the excavation direction (front side).

3: cutter head for obstacle cutting

5: The second cutter head

51: base material

52: Hard blade

52a: Outer end face

53a: The inner side surface

53b: Surface on the outer peripheral side

54: The first inclined surface

54a: The first inclined surface of the hard blade side

54b: The first inclined surface on the base metal side

55: flat surface

55a: Flat side of hard blade

55b: Flat surface of base metal side

56: second inclined surface

56a: Outer peripheral part

56b: Inner peripheral part

57: recess

RA: Radial direction

RA1: Radial direction

RA2: Radial direction

RO: rotation direction

X: direction

X1: direction

X2: direction

d: the amount of protrusion

Claims (9)

A shield tunneling machine includes: A plurality of obstacle cutting tool heads, including a base material, and a plurality of hard blades fixed to the base material in a state protruding in the tunneling direction than the base material and harder than the base material, and an obstacle to the underground Objects for cutting; A cutter head, which is provided with a cutter head for cutting the obstacle, and rotates along with the excavation; and The main body of the shield tunneling machine is provided with the cutter head at the front end of the tunneling direction, The plurality of obstacle cutting tool heads are configured such that the plurality of hard blades are arranged at intervals in the rotation direction of the cutter head, and are located at the outermost side of the rotation direction of the cutter head in the rotation direction of the cutter head The hard blade is arranged inwardly than the base material located at both ends of the rotation direction of the cutter head. The shield tunneling machine according to claim 1, wherein: The cutter head for obstacle cutting has a first inclined surface provided on the outer peripheral side of both the base material and the hard insert in the radial direction of the cutter head, The first inclined surface is inclined from the tip in the tunneling direction to the opposite direction of the tunneling direction as it goes from the inner peripheral side to the outer peripheral side in the radial direction of the cutter head. The shield tunneling machine according to claim 2, wherein: The plurality of hard blades have a flat surface which is arranged at the front end of the excavation direction in a manner continuous with the first inclined surface and is orthogonal to the excavation direction. The shield tunneling machine according to claim 3, wherein: The flat surfaces of the plurality of hard blades are arranged on the same plane. The shield tunneling machine according to any one of claims 1-4, wherein: The cutter head for obstacle cutting has a pair of second inclined surfaces provided at both ends of the base material in the rotation direction of the cutter head, The pair of second inclined surfaces move from the inner side of the obstacle cutting bit in the direction of rotation of the cutter head toward the both end sides, that is, the outer side, and from the hard insert located at the outermost side in the direction of rotation of the cutter head The outer end faces the opposite direction of the tunneling direction. The shield tunneling machine according to any one of claims 1-4, wherein: The cutter head for obstacle cutting has a concave portion provided on the surface on the inner peripheral side in the radial direction of the cutter head, The recessed portion is formed in a concave shape that is recessed from the inner peripheral side toward the outer peripheral side in the radial direction of the cutter head and is along the rotation direction of the cutter head. The shield tunneling machine according to claim 6, wherein: The obstacle cutting tool bit is provided in a plurality of types such that the amount of depression of the recessed portion gradually decreases from the inner peripheral side in the radial direction of the cutter head toward the outer peripheral side. The shield tunneling machine according to any one of claims 1-4, wherein: The obstacle cutting bit is installed in such a way that the number of the hard inserts included in one obstacle cutting bit increases step by step as it goes from the inner peripheral side in the radial direction of the cutter head to the outer peripheral side. Categories. A cutter head for cutting obstacles, including: The base material, which is set on the cutter head that rotates along with the excavation; and A plurality of hard blades are fixed to the base material in a state protruding more in the tunneling direction than the base material, and are harder than the base material, The cutter head for obstacle cutting is configured such that the plurality of hard blades are arranged at intervals in the rotation direction of the cutter head, and in the rotation direction of the cutter head, the cutter head is located on the outermost side of the rotation direction of the cutter head. The hard blades are arranged on the inner side of the base material located at both ends in the rotation direction of the cutter head.

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