JPH06323085A - Rectangular muddy water shield machine - Google Patents

Abstract

PURPOSE:To excavate a horizontal hole having a square cross section. CONSTITUTION:A rotary partition wall 4 is supported rotatably freely with a support plate 3 fixed inside of a skin plate 1 having a square cross section. A rotary shaft 15 is fitted rotatably freely in a position being eccentric to the center of the skin plate 1 of this rotary partition wall 4. A cutter head 20 is fixed to one end of the tip of this rotary shaft 15, and an external teeth gear 31 is fixed to the other end, and the external teeth gear 31 is meshed with an internal teeth gear 32. When the rotary partition wall 4 is rotated by an electric motor 42, the rotary shaft 15 and the cutter head 20 make planetary motion together with the external teeth gear 31. Thereby, an excavating part constituting an equilateral triangle of the cutter head 20 draws a locus whose envelope is a square shape, and excavates a horizontal hole having a square cross section. Excavated earth and sand or small stones are introduced in a chamber 16, and are agitated together with muddy water sent in from a mud feed pipe 52 by the first agitating blade 7 and the second agitating blade 27, and are discharged outside from a mud discharge pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular mud shield excavator for excavating a horizontal hole having a square cross section.

[0002]

2. Description of the Related Art Conventionally, there is the following shield excavator (Japanese Patent Laid-Open No. 63-247497). In this shield excavator, a funnel-shaped hood is fixed to the front end of a cylindrical skin plate, and a partition wall is fixed to the skin plate so as to be located behind the hood, and a space between the rear end of the hood and the partition wall is fixed. The chamber is formed in the. A rotary shaft is rotatably fitted in the center of the partition wall, and a cutter head is fixed to the tip of the rotary shaft. This cutter head is composed of a cone fixed to the tip of the rotary shaft and an excavating portion such as a cutter arm fixed to the tip of the cone, and forms a crushing chamber between the cone and the hood. Then, mud water is supplied to the crushing chamber by a mud pipe, the ground is excavated by the excavation unit, the excavated gravel is crushed in the crushing chamber, and the crushed gravel, earth and sand, etc. are guided from the crushing chamber to the chamber, Further, the sludge pipe communicating with the chamber is used to discharge the gas to the outside.

[0003]

By the way, recently, when excavating a lateral hole for a conduit having a square cross section, there is a demand for excavating a lateral hole having a square cross section according to the shape of the conduit. is there.

However, in the conventional shield excavator, the rotary shaft is arranged at the center of the partition wall fixed to the cylindrical skin plate, that is, the center of the cylindrical skin plate, and the cutter head fixed to this rotary shaft is rotated. Since the excavation is performed, the excavated lateral hole is necessarily circular, and there is a problem that the lateral hole having a square cross section cannot be excavated.

Therefore, an object of the present invention is to provide a rectangular mud shield excavator capable of excavating a horizontal hole having a square cross section.

[0006]

In order to achieve the above object, a rectangular mud shielded excavator according to the invention of claim 1 is provided with a skin plate having a substantially square cross-section and a front chamber disposed inside the skin plate. Facing the
A rotary partition wall rotatably supported by the skin plate about the center of the skin plate, a stirring blade fixed to a wall surface of the rotary partition wall facing the chamber, and a center of the skin plate of the rotary partition wall. A rotary shaft rotatably supported at an eccentric position, a cutter head fixed to the tip of the rotary shaft and having an excavation portion forming a substantially equilateral triangle, and an external fixed to the other end of the rotary shaft. The tooth gear is fixed to the skin plate so that the center thereof coincides with the center of the skin plate, and the diameter of the pitch circle is 4/3 of the diameter of the pitch circle of the external gear.
And an internal gear that doubles and meshes with the external gear,
Rectangular mud shield excavation characterized by comprising a drive device for driving the rotary partition wall, a mud pipe for sending mud from the outside into the chamber, and a mud pipe for discharging mud in the chamber to the outside Machine.

The rectangular muddy water shield excavator of the second aspect of the invention is the rectangular muddy water shield excavator of the first aspect, further comprising a stirring blade fixed to a portion of the rotary shaft located in the chamber. Is characterized by.

[0008]

In the rectangular muddy water shield excavator according to the first aspect, when the drive device is driven, the rotary partition wall rotatably supported by the skin plate having a substantially square cross section rotates. Then, the rotary shaft supported by the rotary partition wall at a position eccentric to the center thereof, that is, the center of the skin plate, rotates around the center of the skin plate. Therefore, the external gear fixed to the other end of the rotary shaft meshes with the internal gear and revolves while revolving. Therefore, the rotating shaft also rotates while revolving around the center of the skin plate. That is, the rotating shaft performs a planetary motion that revolves while rotating while being supported eccentrically with respect to the center of the skin plate through a rotating partition wall that rotates. Then, the excavating portion which constitutes the substantially equilateral triangle of the cutter head fixed to the tip of the rotating shaft excavates earth and sand and gravel. At this time, the excavation part of the cutter head is
Since the diameter of the pitch circle of the external gear and the diameter of the pitch circle of the internal gear have a ratio of 3: 4, the rotary shaft makes a planetary motion, and the envelope of the locus of this excavation part becomes substantially square. . In addition, the soil and gravel of the excavated ground enter the chamber,
The stirring blade fixed to the chamber side wall of the rotary partition wall stirs the muddy water fed from the mud feeding pipe. Then, the muddy water containing the stirred earth and sand and gravel is discharged to the outside from the mud discharge pipe.

Therefore, in combination with the fact that the skin plate has a substantially square cross section, a substantially square lateral hole can be excavated.

Further, the rotary partition wall is rotated by a driving device, whereby the external gear fixed to the rotary shaft meshes with the internal gear to perform a planetary motion. Therefore, this rectangular muddy water shield excavator can have a simpler structure and a shorter length as compared with, for example, one using a crank mechanism. Also, since the length of this rectangular muddy water shield excavator becomes shorter, the angle at which the excavation section advances can be changed to a larger angle than before,
Makes it easier to curve.

Further, since the stirring blade of the rotary partition wall makes three rotations in the opposite rotation direction while the cutter head makes one rotation, the sand and gravel in the chamber can be efficiently stirred.

Since the rotary shaft is in a planetary motion, it is generally considered difficult to partition the inside of the skin plate into the cutter head side and the drive unit side at this location. However, in the present invention, the rotary shaft is rotatably supported at an eccentric position of the rotary partition wall, and the rotary partition wall is rotatably supported by the skin plate, while allowing the planetary motion of the rotary shaft, The cutter head side and the drive device side in the skin plate can be tightly partitioned.

Further, according to the rectangular muddy water shield excavator of claim 2, in the rectangular muddy water shield excavator of the first aspect, the stirring blade fixed to the portion of the rotary shaft located in the chamber is provided. The stirring blade of the rotary shaft makes one rotation in the opposite rotation direction while the stirring blade of the rotary partition wall makes three rotations, so that the sand and gravel introduced into the chamber are efficiently stirred.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rectangular muddy water shield excavator of the present invention will be described in detail below with reference to an embodiment.

FIG. 1 is a sectional view of a rectangular muddy water shield excavator according to an embodiment of the present invention, in which 1 is a skin plate having a substantially square cross section, and 2 is fixed inside the front end of the skin plate 1. , A hood having a funnel-shaped inner circumference and a substantially square outer circumference, 3 is a ring-shaped support plate fixed to the inside of the skin plate 1 from the rear end of the hood 2 with a predetermined gap, and 4 is this support plate 3 is a rotary partition wall rotatably supported with the center of the skin plate 1 as a rotation center via a bearing 11. A chamber 16 is formed between the rotary partition wall 4 and the rear end of the hood 2. Then, the first cylindrical portion 6 is fixed at a position eccentric with respect to the center of the skin plate 1 of the rotary partition wall 4, the rotary shaft 15 is inserted inside thereof, and rotatably supported via a bush not shown. There is. The cutter head 20 is fixed to one end of the rotary shaft 15 on the hood 2 side. On the other hand, an external gear 31 is fixed to the other end of the rotary shaft 15 on the support plate 3 side. The external gear 31 meshes with an internal gear 32 fixed to the inner periphery of the skin plate 1, and the external gear 31 and the internal gear 32 constitute an eccentric ring gear device 30.

The rotary partition wall 4 includes a disc portion 4a, the above-mentioned first cylindrical portion 6 fixed to the disc portion 4a, and a second cylinder extending from the outer periphery of the disc portion 4a toward the support plate 3 side. Part 4b
And a third cylindrical portion 5 extending from the disc portion 4a toward the support plate 3 on the inner circumference of the second cylindrical portion 4b. Further, as shown in FIG. 4, on the wall surface of the disk portion 4a of the rotary partition wall 4 on the chamber 16 side, the distance between the outer circumference of the first cylindrical portion 6 of the rotary partition wall 4 and the outer circumference of the disk portion 4a is shown. Is provided with the first stirring blade 7 arranged in the radial direction at the largest position, and functions to stir gravel, earth and sand, etc. with muddy water in the chamber 16. The rotary partition wall 4 is rotatably supported on the support plate 3 via a bearing 11 arranged on the inner circumference of the second cylindrical portion 4b, and by this bearing 11, a radial load and a thrust load acting on the rotary partition wall 4 are applied. Both can be supported. A seal member 13 seals between the second cylindrical portion 4b on the outer circumference of the rotary partition wall 4 and the spacer plate 12 fixed to the inner circumference of the skin plate 1 and having a substantially square outer circumference and a cylindrical inner circumference. ing. On the other hand, the third cylindrical portion 5 penetrates the inner periphery of the support plate 3 and forms an external gear 5a shown in FIG. 5 on the outer periphery of the eccentric ring gear device 30 side. The drive gear 4 that meshes with the external gear 5a.
The third cylindrical portion 5, that is, the rotary partition wall 4 is rotated by the electric motor 42 as a driving device via the motor 1.

The cutter head 20 is shown in FIGS.
As shown in, a cylindrical portion 26 fixed to the tip of the rotary shaft 15 by a key 28, three cutter arms 21 fixed to the cylindrical portion 26 at equal intervals in the circumferential direction, and extending in the radial direction, The cutter arm 21 is composed of a cutter ring 22 having a small curvature that connects substantially the ends of the cutter arm 21.
In addition, on the side of the rotary partition wall 4 of the cutter arm 21, as shown in FIG.
The blade 23 shown in is provided for reinforcement. Further, one or two cutter teeth 24 are arranged at different positions in the radial direction on the front surface of the cutter arm 21, while one outer peripheral bit 25 is arranged at the center of the front surface of the cutter ring 23. is doing. The vertex A of each cutter arm 21 has a substantially square skin plate 1.
Of the cutter arm 21 are connected to each other to form an equilateral triangle. Further, the chamber 1 of the cylindrical portion 26 of the cutter head 20.
The outer periphery facing 6 is provided with three second stirring blades 27 that are fixed at equal intervals in the circumferential direction and extend in the radial direction. That is, the rotary shaft 15 is provided with a second portion through the cylindrical portion 26.
The stirring blade 27 is provided.

On the other hand, in the eccentric ring gear device 30, the radius of the pitch circle of the internal gear 32 and the external gear 31 shown in FIG.
The ratio of the radii of the pitch circles is 4 to 3. The center of the internal gear 32 is located at the center of the skin plate 1. For example, the radius R1 of the pitch circle of the internal gear 32 is
4. If the radius R2 of the pitch circle of the external gear 31 is R2 = 3,
The rotary shaft 15 and the external gear 31 are the skin plate 1
This means that the center is eccentric by an eccentric amount e = 1.
Further, this eccentricity e = 1, radius R1 = 4, radius R2 = 3
At this time, as shown in FIG. 2, the length S of one side of the skin plate 1 is set to S = 14, and the length S of one side of an equilateral triangle connecting the apex A of the cutter arm is set to S = 14. The electric motor 42 is connected to the external gear 5a of the third cylindrical portion 5 and the drive gear 41.
When the rotary partition wall 4 is rotated via the, the external gear 31 of the eccentric ring gear device 30 meshes with the internal gear 32,
The external gear 31 can revolve while rotating around the inner circumference of the internal gear 32.

In FIG. 1, reference numeral 51 is a direction correction jack for correcting the excavation direction of the rectangular muddy water shield excavator, and 52 is the skin plate 1 of the spacer plate 12.
4 is a mud feed pipe for guiding muddy water to the chamber 16 through an opening 53 shown in FIG. Further, it is a mud discharge pipe (not shown) for discharging the earth and sand in the chamber 16 to the outside through the opening 54 shown in FIG. 4 provided in a wide portion near the corner of the skin plate 1 of the spacer plate 12.

The rectangular muddy water shield excavator constructed as described above operates as follows. First, the rectangular muddy water shield excavator is propelled forward through a buried pipe by a jack (not shown) provided at the bottom of the vertical hole.

When the rotating partition wall 4 is rotated by the electric motor 42 via the external gear 5a of the third cylindrical portion 5 and the drive gear 41 while propelling the rectangular muddy water shield excavator forward, the rotating partition wall 4 is eccentric. The rotating shaft 15 rotatably supported in the above position rotates around the center of the skin plate 1. Therefore, the external gear 3 fixed to one end of the rotary shaft 15
1 meshes with the internal gear 32 to rotate, and the rotary partition wall 4
While rotating, it rotates once and revolves in the direction opposite to that of the rotation three times while rotating. By the planetary motion of the external gear 31, the rotary shaft 15 and the cutter head 20 also perform one rotation while the rotary partition wall 4 makes three revolutions, and three revolutions in the opposite direction to perform the planetary motion. . On the other hand, the radius R1 = 4 of the pitch circle of the internal gear 32 of the eccentric ring gear device 30, the radius R2 = 3 of the pitch circle of the external gear 31, the eccentric amount e = 1 of the rotary partition wall 4, the apex A of the cutter arm 21. Since the length S of one side of an equilateral triangle connecting S and the length S of one side of the skin plate 1 are S = 14, the locus of the tip A of the cutter arm 21 of the cutter head 20 is as shown in FIG. The shape of the skin plate 1 becomes a substantially square shape that fits the outer shape of the skin plate 1. Therefore, the excavating portion such as the cutter arm 21 excavates a substantially square lateral hole conforming to the outer shape of the skin plate 1. Then, the excavated earth and sand and gravel are guided into the chamber 16 filled with the muddy water guided from the opening 53 of the mud transport pipe 52. In this way, the gravel and the earth and sand introduced into the chamber 16 are stirred by the first stirring blade 7 of the rotary partition wall 4 and the second stirring blade 27 of the rotary shaft 15, and the drainage pipe (not shown) from the opening 54. Is discharged to the outside through.

As described above, since the tip of the cutter arm 21 of the cutter head 20 excavates the ground in front while drawing a locus of a substantially square shape, the outer shape of the skin plate 1 is combined with a substantially square shape. It is possible to drill a substantially square lateral hole.

Further, since the electric motor 42 rotates the rotary partition wall 4 via the external gear 5a of the third cylindrical portion 5 and the drive gear 41, the external gear 31 is planetary-moved, for example, of a crank mechanism. Such a long transmission mechanism is not necessary. Therefore, the structure of this rectangular muddy water shield excavator can be simplified and the length can be shortened. Further, by shortening the length of this rectangular muddy water shield excavator, the angle of advance of the excavation portion by the direction correcting jack 51 can be greatly changed, and the curve of the lateral hole can be easily implemented.

Further, the first stirring blade 7 of the rotary partition wall 4
While the cutter head 20 makes one rotation,
While rotating, the second stirring blade 2 of the rotating shaft 15
Since 7 rotates once in the rotation direction opposite to the first stirring blade 7 of the rotary partition wall 4, that is, in the same rotation direction as the cutter head 20, the sand and gravel introduced into the chamber 16 should be stirred particularly efficiently. You can

Further, when excavating the ground, a large bending moment acting on the rotating shaft 15 which makes planetary motion is supported by the rotating partition wall 4 which rotatably supports the rotating shaft 15 at an eccentric position. From this rotating shaft 1
5 can rotate smoothly without bending.

Further, since the rotary shaft 15 is rotatably supported at an eccentric position of the rotary partition wall 4, and the rotary partition wall 4 is rotatably supported by the skin plate 1, the planetary motion of the rotary shaft 15 is achieved. While allowing the above, the chamber 16 side in the skin plate 1 and the eccentric ring gear device 30 are allowed.
Can be closely separated from the side. Therefore, it is possible to prevent the muddy water in the chamber 16 and the mixed gravel and earth and sand from entering the eccentric ring gear device 30 side in the skin plate 1.

In the above embodiment, the rotary partition wall 4 is rotated by the electric motor 42 via the external gear 5a of the third cylindrical portion 5 and the drive gear 41. However, the rotary partition wall is rotated by the drive device such as the electric motor. Of course, the transmission mechanism for transmitting force is not limited to this.

In the above embodiment, the eccentricity e of the rotary partition wall 4 is 1, and the radius R1 of the pitch circle of the internal gear 32 is R1.
4, the radius R2 of the pitch circle of the external gear 31 was set to R2 = 3, and the length S of one side of an equilateral triangle connecting the apex A of the cutter arm 21 was set to S = 14. By changing the ratio with respect to e, it is possible to excavate a lateral hole having a substantially square cross-section with one side curved inward or outward and slightly deformed.

[0029]

As is apparent from the above, in the rectangular mud shield excavator of the first aspect of the present invention, the rotary partition is arranged inside the skin plate having a substantially square cross section, and the rotary partition is rotated about the center of the skin plate. It is rotatably supported as a center, a stirring blade is provided on the chamber side wall of the rotary partition, and the rotary shaft is rotatably supported at a position eccentric to the center of the skin plate of the rotary partition. A cutter head having a digging portion forming a substantially equilateral triangle is fixed to the tip of the, and an external gear is fixed to the other end of the rotary shaft, and the diameter of the pitch circle is the diameter of the pitch circle of the external gear.
⅓ times the internal gear is meshed with the external gear, the internal gear is fixed to the skin plate so that the center of the internal gear coincides with the skin plate, and the rotary partition wall is driven by a driving device to drive the rotary partition wall. The mud water is sent from the mud pipe into the chamber provided in the front, and the mud water in the chamber is discharged from the mud pipe.

Therefore, according to the rectangular muddy water shield excavator of the first aspect of the invention, when the rotary partition is driven by the drive device, the rotation of the rotary partition causes the external gear to rotate while meshing with the internal gear. By revolving in the opposite direction, the rotating shaft and cutter head fixed to the external gear are revolved while rotating. Therefore, the excavation part forming the approximately equilateral triangle of the cutter head makes a planetary motion,
Since the locus of the excavation part of this substantially equilateral triangle becomes a substantially square,
Coupled with the fact that the skin plate has a substantially square cross section, a substantially square lateral hole can be drilled.

Further, since the drive device does not require a long transmission mechanism for rotating the rotary partition wall and driving the external gear by using the crankshaft or the like, the structure of this rectangular mud shield excavator can be simplified. , The captain can be shortened. Further, if the length of this rectangular muddy water shield excavator is shortened, the angle of advance of the excavation part can be changed more greatly, and the curve of the lateral hole can be easily implemented.

Further, since the stirring blade of the rotary partition wall makes three rotations in the opposite rotation direction while the cutter head makes one rotation, the sand and gravel introduced into the chamber can be efficiently stirred. .

Further, during excavation, a large bending moment acting on the rotating shaft that is in planetary motion is supported by the rotating partition wall, so that this rotating shaft can rotate smoothly without bending.

Further, since the rotary shaft is rotatably supported at an eccentric position of the rotary partition wall, and the rotary partition wall is rotatably supported by the skin plate, while permitting the planetary motion of the rotary shaft, The cutter head side and the drive device side in the skin plate can be tightly partitioned.

Further, a rectangular muddy water shield excavator according to a second aspect of the present invention is the rectangular muddy water shield excavator according to the first aspect, which is provided with a stirring blade fixed to a portion inside the chamber of the rotating shaft.

Therefore, according to the rectangular muddy water shield excavator of the second aspect of the present invention, the stirring blade of the rotary shaft is rotated in the opposite rotation direction while the stirring blade of the rotary partition wall rotates three times.
Since it rotates, the sand and gravel introduced into the chamber can be stirred particularly efficiently.

[Brief description of drawings]

FIG. 1 is a sectional view of a rectangular muddy water shield excavator according to an embodiment of the present invention.

FIG. 2 is a view seen from a line II-II in FIG.

FIG. 3 is a view seen from a line III-III in FIG. 1.

FIG. 4 is a view seen from line IV-IV in FIG. 1.

5 is a view seen from the line VV in FIG. 1. FIG.

6 is a view as seen from the line VI-VI in FIG. 1.

FIG. 7 is an explanatory view showing excavation of a square lateral hole by the excavation portion forming an equilateral triangle performing a planetary motion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Skin plate, 2 ... Hood, 3 ... Support plate, 4 ... Rotating partition wall, 4a ... Disc part, 4b ... 2nd cylindrical part, 5 ... 3rd cylindrical part, 6 ... 1st cylindrical part, 7 ... 1st Stirring blade, 11 ... Bearing, 12 ... Spacer plate, 13 ... Seal member, 15
… Rotation axis, 16… Chamber, 20… Cutter head, 2
DESCRIPTION OF SYMBOLS 1 ... Cutter arm, 27 ... 2nd stirring blade, 30 ... Eccentric ring gear device, 31 ... External gear, 32 ... Internal gear, 4
1 ... Drive gear, 42 ... Electric motor, 51 ... Direction correction jack, 52 ... Mud pipe.

Claims (2)

[Claims] 1. A skin plate having a substantially square cross section, arranged inside the skin plate, facing the front chamber, and rotatably supported by the skin plate with the center of the skin plate as the center of rotation. A rotary partition, a stirring blade fixed to the wall surface of the rotary partition facing the chamber, a rotary shaft rotatably supported at a position eccentric to the center of the skin plate of the rotary partition, and the rotary shaft A cutter head having an excavation portion that is fixed to the tip end of the skin plate and that forms a substantially equilateral triangle; an external gear that is fixed to the other end of the rotating shaft; and the skin plate so that its center coincides with the center of the skin plate. And an internal gear that has a pitch circle diameter of 4/3 times the diameter of the pitch circle of the external gear and that meshes with the external gear. A rectangular mud shield provided with a drive device for driving the rotary partition wall, a mud pipe for feeding mud from the outside into the chamber, and a mud pipe for discharging the mud in the chamber to the outside. Excavator. 2. The rectangular muddy water shield excavator according to claim 1, further comprising a stirring blade fixed to a portion of the rotary shaft located inside the chamber.