JPH06336896A - Rectangular mudding shield machine - Google Patents

Abstract

PURPOSE:To excavate a horizontal hole having a square cross section. CONSTITUTION:A rotary bulkhead 3 is rotatably supported on a support plate 2 fixed to the inside of a skin plate 1 having a square cross section. A rotary shaft 15 is rotatably coupled at the position eccentric against the center of the skin plate 1 of the rotary bulkhead 3. A cutter head 20 is fixed to one tip end of the rotary shaft 15, an external gear 31 is fixed to the other end, and the external gear 31 is meshed with an internal gear 32. The rotary shaft 15 and the cutter head 20 are put into planetary motion together with the external gear 31 by the rotation of the rotary bulkhead 3. The equilateral triangular excavation section of the cutter head 20 excavates a horizontal hole having a square cross section. The excavated sediment and gravel enter a space 16, and bentonite is injected into the space 16 from a mudding agent injection pipe 52. The sediment and gravel are stirred by the first stirring vane 7 and the second stirring vane 23, and the mixture is discharged to the outside by a screw conveyor 53.

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 lateral 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.

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, the rectangular mud shield excavator according to the invention of claim 1 is provided with a skin plate having a substantially square cross section, and the skin plate is disposed inside the skin plate. With respect to the center of the skin plate of the rotary partition, a rotary partition that is rotatably supported by the skin plate with the center of the plate as the center of rotation, a stirring blade fixed to a wall surface facing the front of the rotary partition, 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 gear fixed to the other end of the rotary shaft. And is fixed to the skin plate such that the center thereof coincides with the center of the skin plate, and the diameter of the pitch circle is 4/3 times the diameter of the pitch circle of the external gear, An internal gear that meshes with the external gear, a drive device that revolves the rotary shaft, and a sludge injection that injects a sludge from the outside into the space between the rotary partition wall and the cutter head. A rectangular mud shield excavator comprising a pipe and a screw conveyor for discharging the material to be excavated in the space to the outside.

A rectangular mud shield excavator according to a second aspect of the present invention is the rectangular mud shield excavator according to the first aspect, characterized in that a stirring blade is fixed to the back surface of the cutter head.

[0008]

In the rectangular mud shield excavator of the first aspect, when the drive device is driven, the rotating shaft supported at a position eccentric to the center of the skin plate revolves 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,
In the excavated portion of the cutter head, 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, so that the rotary shaft makes a planetary motion and the locus of the excavated portion. The envelope of is almost square. Also, the earth and sand or gravel that is the object to be excavated enters the space between the cutter head and the rotary partition wall,
The mud additive is injected into this space from the mud additive injection pipe. Further, the earth and sand and the gravel in the space are agitated together with the mud additive by the agitating blades fixed to the wall surface facing the front of the rotary partition wall to be in a plastic flow state. The sand and gravel in the plastic flow state are discharged to the outside by the screw conveyor.

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 rotating shaft revolves by a driving device, whereby the external gear fixed to the rotating shaft meshes with the internal gear to make a planetary motion. Therefore, this rectangular mud shield excavator can have a simpler structure and a shorter machine length than, for example, a machine using a crank mechanism. Also, because the length of this rectangular addition mud shield excavator is shortened, 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.

Further, since the earth and sand and the gravel are agitated with the mud additive to be in a plastic fluidized state, the earth and sand and the gravel can be easily fed by the screw conveyor. On the other hand, a film containing a mud additive is formed on the surface of the face of the ground facing the cutter head, and this film can prevent the face of the ground from collapsing.

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 because the rotary shaft is in a planetary motion. 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.

According to the rectangular mud shield excavator of claim 2, in the rectangular mud shield excavator of claim 1, since the stirring blade is fixed to the back surface of the cutter head, the cutter head is stirred. Since the blade makes one rotation in the opposite rotation direction while the stirring blade of the rotary partition wall makes three rotations, the sand and gravel in the space between the cutter head and the rotary partition wall can be stirred particularly efficiently.

[0015]

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

FIG. 1 is a cross-sectional view of a rectangular mud 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 skin plate 1. The ring-shaped support plate 3 is a rotary partition wall rotatably supported on the support plate 2 with a bearing 11 around the center of the skin plate 1. The first cylindrical portion 6 is fixed at a position eccentric to the center of the skin plate 1 of the rotary partition wall 3, the rotary shaft 15 is inserted inside the first cylindrical portion 6, and the first cylindrical portion 6 is rotatably supported via a bush (not shown). At the front end of the rotary shaft 15,
While the cutter head 20 is fixed, an external gear 31 is fixed to the other end of the rotary shaft 15 on the support plate 2 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 3 has a disc portion 4, the first cylindrical portion 6 fixed to the disc portion 4, and a second cylindrical portion extending from the outer periphery of the disc portion 4 to the support plate 2 side. 4a and the 3rd cylindrical part 5 which extends from the disk part 4 to the support plate 2 side in the inner periphery of this 2nd cylindrical part 4a. Further, as shown in FIG. 3, on the wall surface of the rotary partition wall 3 facing the front of the disk portion 4, as shown in FIG.
The rotary partition wall 3 is provided with three first stirring blades 7 radially arranged at every 90 degrees, and the gravel, the sand and the like are stirred in the space 16 between the rotary partition wall 3 and the cutter head 20. Work. The rotary partition wall 3 is rotatably supported by the support plate 2 via a bearing 11 arranged on the inner circumference of the second cylindrical portion 4a, and by this bearing 11, a radial load and a thrust load acting on the rotary partition wall 3 are applied. Both can be supported. In addition, the rotary partition 3
A seal member 13 seals between the outer peripheral second cylindrical portion 4a and the spacer plate 12 fixed to the inner periphery of the skin plate 1 and having a substantially square outer periphery and a cylindrical inner periphery. On the other hand, the third cylindrical portion 5 penetrates the inner periphery of the support plate 2 and forms the external gear 5a shown in FIG. 4 on the outer periphery of the eccentric ring gear device 30 side. The third cylindrical portion 5, that is, the rotary partition wall 3 is rotated by an electric motor 42 as a drive device via a drive gear 41 that meshes with the external gear 5a.

The cutter head 20 is shown in FIGS.
As shown in FIG. 4, a cylindrical portion 26 fixed to the tip of the rotary shaft 15, three cutter arms 21 fixed to the cylindrical portion 26 at equal intervals in the circumferential direction and extending in the radial direction, and the cutter arm 21. It is composed of a cutter ring 22 having a small curvature that connects substantially the distal end portions of 21. The second stirring blade 23 shown in FIG. 1 is fixed to the rear surface of the cutter arm 21 facing the rotary partition wall 3. 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. There is. The apex A of each cutter arm 21 is located substantially outside the skin plate 1 having a substantially square cross section, and the apex A of the cutter arm 21 is connected to form an equilateral triangle.

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 3 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 mud shield excavator, and 52 is the skin plate 1 of the spacer plate 12.
The opening 5 shown in FIG. 3 provided near the center of the upper flat portion of the
A mud additive injection pipe for injecting bentonite as a mud additive into the space 16 between the cutter head 20 and the rotary partition wall 3 through 2a, and 53 is an earth and sand gravel as the object to be excavated in the space 16 to the outside. It is a screw conveyor to send to.
Further, as shown in FIGS. 1 and 3, the screw conveyor 53 has an opening portion 53a provided in a wide area near the corner portion of the skin plate 1, and the screw 54 is disposed in a cylindrical tube. By rotating the screw 54 by a drive device (not shown), the earth and sand and the gravel accumulated in the space 16 are sent out from the space 16 side to the outside.

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

While propelling this rectangular mud shield excavator forward, the rotary partition wall 3 is rotated by the electric motor 42 via the external gear 5a of the third cylindrical portion 5 and the drive gear 41. A rotating shaft 15 rotatably supported at an eccentric position revolves 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 and rotates, and the rotary partition wall 3
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 3 makes three revolutions, and three revolutions in the opposite direction to perform the planetary motion. . On the other hand, the radius R1 of the pitch circle of the internal gear 32 of the eccentric ring gear device 30 is R4, the radius of the pitch circle of the external gear 31 is R2 of 3, the eccentric amount e of the rotary partition wall 3 is 1, and the apex A of the cutter arm 21 is A. 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 is 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. And the excavated earth and sand and gravel are in space 16
Then, bentonite is injected into the space 16 through the opening 52 a of the mud additive injection pipe 52. And the space 16
The earth and sand and the gravel therein are stirred by the first stirring blade 7 of the rotary partition wall 3 and the second stirring blade 23 of the cutter head 20,
Put in a plastic flow state. In this way, the plastic fluidized soil and gravel accumulated in the space 16 is discharged to the outside by the screw conveyor 53 from the opening 53a.

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 skin plate 1 has a substantially square outer shape. It is possible to drill a substantially square lateral hole.

Further, since the electric motor 42 rotates the rotary partition wall 3 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 mud shield excavator can be simplified and the length can be shortened. Further, by shortening the length of this rectangular mud shield excavator, the angle of advance of the excavation section by the direction correcting jack 51 can be greatly changed, and it becomes easy to implement the curve of the lateral hole.

The first stirring blade 7 of the rotary partition wall 3 is also used.
The second stirring blade 2 of the cutter head 20 while the rotor rotates 3 times.
Since 3 rotates once in the rotation direction opposite to the first stirring blade 7, the space 16 between the cutter head 20 and the rotary partition wall 3
The sand and gravel inside can be stirred efficiently.

Further, since the earth and sand and the gravel are agitated with the bentonite to be in a plastic flow state, the screw conveyor 5
By 3, the earth and sand and gravel can be easily sent out. On the other hand, a film of earth and sand containing bentonite is formed on the surface of the ground face in front of the cutter head 20, and the ground is pressed by this film so that the face part of the ground does not collapse.

Further, when excavating the ground, a large bending moment acting on the rotating shaft 15 which makes a planetary motion is supported by the rotating partition wall 3 which rotates while rotatably supporting 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 3, and the rotary partition wall 3 is rotatably supported by the skin plate 1, the planetary motion of the rotary shaft 15 is performed. While allowing, the cutter head 20 side and the eccentric ring gear device 30 side in the skin plate 1 can be tightly partitioned. Therefore, it is possible to prevent the sand and gravel that are stirred together with the bentonite in the space 16 between the cutter head 20 and the rotary partition wall 3 from entering the eccentric ring gear device 30 side in the skin plate 1.

In the above-described embodiment, the rotary partition wall 3 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 a drive device such as an electric motor. Of course, the transmission mechanism for transmitting force is not limited to this. The drive device does not necessarily drive the rotary partition wall, and the crankshaft may directly drive the rotary shaft.

Although bentonite was used as a mudizing agent in the above-mentioned examples, the mudifying agent is not limited to this, and a film that prevents the collapse of the face surface of the ground while making the sand and gravel into a plastic flow state. Any mudifying agent that forms

In the above embodiment, the eccentricity e of the rotary partition wall 3 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.

[0032]

As is apparent from the above, in the rectangular mud shield excavator of the first aspect of the present invention, the rotary partition wall is arranged inside the skin plate having a substantially square cross section, and the rotary partition wall is located at the center of the skin plate. It is rotatably supported as a center of rotation, a stirring blade is provided on the wall surface facing the front 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 that forms a substantially equilateral triangle is fixed to the tip of the rotary shaft, and an external gear is fixed to the other end of the rotary shaft, and the diameter of the pitch circle is 4 times the diameter of the pitch circle of the external gear. /
A three-fold internal gear is meshed with an external gear, fixed to the skin plate so that the center of the internal gear is aligned with the skin plate, and the rotary shaft is revolved by a driving device to rotate with the cutter head. A mud additive is injected from a mud additive injection pipe into a space between the partition wall and earth and sand or gravel as an object to be excavated in the space is discharged to the outside by a screw conveyor.

Therefore, according to the rectangular mud shield excavator of the first aspect of the present invention, when the drive device revolves the revolving shaft, the revolving shaft revolves while rotating the outer gear while engaging the outer gear with the inner gear. The rotation shaft and cutter head fixed to the external gear are revolved while revolving in the opposite direction. Therefore, the excavation portion forming the approximately equilateral triangle of the cutter head makes a planetary motion, and the locus of the excavation portion of the approximately equilateral triangle becomes approximately square, so that the skin plate has an approximately square cross-section. ,
A substantially square lateral hole can be drilled.

The drive device revolves the rotary shaft,
Since a long transmission mechanism for driving an external gear using a crankshaft or the like is not necessary, the structure of this rectangular mud shield excavator can be simplified and the machine length can be shortened. Also, when the captain of this rectangular mud shield excavator becomes shorter,
The advancing angle of the excavation can be changed more greatly, and it becomes easier to implement the curve of the lateral hole.

Further, since the stirring blade of the rotary partition makes three revolutions in the opposite rotation direction while the cutter head makes one revolution, the sand and gravel in the space between the cutter head and the rotary partition can be efficiently removed. It can be well stirred.

Further, the above-mentioned earth and sand and gravel are stirred with a mud additive,
Since it is in a plastic flow state in the space, soil and gravel can be easily discharged to the outside by a screw conveyor. On the other hand, a film of earth and sand containing a mud additive is formed on the surface of the ground face in front of the cutter head, and the ground can be pressed by this film to prevent the face part of the ground from collapsing.

Further, at the time of 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 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.

A rectangular mud shield excavator according to a second aspect of the present invention is the rectangular mud shield excavator according to the first aspect, in which a stirring blade is fixed to the back surface of the cutter head.

Therefore, according to the rectangular mud shield excavator of the second aspect of the present invention, the stirring blade of the cutter head makes one rotation in the opposite rotation direction while the stirring blade of the rotary partition wall makes three rotations. The soil and gravel in the space between the cutter head and the rotary partition can be stirred particularly efficiently.

[Brief description of drawings]

FIG. 1 is a sectional view of a rectangular mud 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.

FIG. 6 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]

1 ... Skin plate, 2 ... Support plate, 3 ... Rotating partition wall, 4 ...
Disc portion, 4a ... Second cylindrical portion, 5 ... Third cylindrical portion, 6 ... First
Cylindrical part, 7 ... First stirring blade, 11 ... Bearing, 12
... Spacer plate, 13 ... Seal member, 15 ... Rotating shaft, 16
... space, 20 ... cutter head, 21 ... cutter arm, 2
2 ... Cutter ring, 23 ... 2nd stirring blade, 30 ... Eccentric ring gear device, 31 ... External gear, 32 ... Internal gear, 4
DESCRIPTION OF SYMBOLS 1 ... Drive gear, 42 ... Electric motor, 51 ... Direction correction jack, 52 ... Sludge injection pipe, 53 ... Screw conveyor,
54 ... screw.

Claims (2)

[Claims] 1. A skin plate having a substantially square cross section, a rotary partition wall disposed inside the skin plate and rotatably supported by the skin plate with a center of the skin plate as a rotation center, and A stirring blade fixed to a wall surface facing forward, a rotary shaft rotatably supported at a position eccentric with respect to the center of the skin plate of the rotary partition wall, fixed to the tip of the rotary shaft, and substantially fixed. A cutter head having an excavation part forming a triangle, an external gear fixed to the other end of the rotary shaft, fixed to the skin plate so that its center coincides with the center of the skin plate, and a pitch circle Has a diameter of 4/3 times the diameter of the pitch circle of the external gear, an internal gear that meshes with the external gear, and a drive device that revolves the rotary shaft. And a screw conveyor for discharging a drilling agent in the space from the outside into the space between the rotary partition and the cutter head, and a screw conveyor for discharging the object to be drilled in the space to the outside. Rectangular rectangular mud shield excavator. 2. The rectangular mud shield excavator according to claim 1, wherein a stirring blade is fixed to the back surface of the cutter head.