JP2000328885A - Excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavator capable of favorably excavating natural ground including a bed rock stratum and a cohesive soil stratum and discharging excavated soil in a favorable condition without retension of soil in an excavated soil chamber. SOLUTION: An excavated soil chamber 7 is constituted of a peripheral wall 1a composed of a cutter head 4, a partition wall 5, and a part of a shield machine body at the front end of the shield machine body 1. A cone rotor 9 and an agitator blade driven by electrical motors are arranged at the lower part of the excavated soil chamber 7. A funnel-shaped crushing wall is formed at the periphery of the cone rotor 9 to form an agitation chamber. A discharge opening is formed in the vicinity of the basal end of the cone rotor 9 and connected to a mud discharge pipe 12. A plurality of protrusions 21 are formed on the peripheral wall 1a of the excavated soil chamber 7 and a crushing blade 22 positioned opposite to the protruded pieces 4c and spaced apart by a specified distance from the protruded pieces 4c is formed on the arm 4c of the cutter head 4. The crushing blade 22 is rotted in accordance with the rotation of the cutter head 4. When gravels are caught by the protruded piece 4c, shocks are given to the gravels to crush them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction in which excavated earth and sand taken into a earth shaving chamber is smoothly discharged by stirring with a stirring blade and crushed by a cone rotor. The present invention relates to an excavator configured to be able to crush gravel by cooperation of a crushing wing provided and a projection provided on a shield body.

[0002]

2. Description of the Related Art When a tunnel is excavated in the ground, a shield method or a semi-shield method is adopted depending on the diameter of the tunnel and other conditions. The excavator used in these construction methods is provided with a rotatable cutter head equipped with a cutting member for excavating the ground at the tip, and muddy water or compressed air around the cutter head to prevent collapse of the ground. To excavate the ground by propelling while rotating the cutter head, and transport the excavated earth and sand by a conveyor such as an auger or a screw conveyor, or transport the excavated soil with muddy water to the outside.

[0003] The excavating member attached to the cutter head includes:
Those that can excavate the ground most efficiently according to the geology of the ground are adopted. If the ground contains rock formations,
For example, a drilling member such as a roller bit suitable for excavating a bedrock is employed, and when the ground is a viscous layer, an excavating member such as a scraper suitable for excavating the viscous soil layer is employed. It is attached to the cutter head.

The earth and sand excavated by the excavation member are taken into a shaving chamber formed on the back side of the cutter head, and then discharged to the ground through the inside of the excavator. Since the discharge port of the earth and sand formed in the shaving chamber is not infinitely large, if the excavated gravel is large, it is necessary to crush the gravel inside the shaving chamber. For this reason, several proposals have been made for the crushing method of gravel.

[0005] An example of a method of crushing gravel in an excavator adopting a muddy water method will be described. For example, a cone-shaped cone rotor that rotates eccentrically inside a crushing chamber is provided, and the inner periphery of a soil shaving chamber is crushed by the cone. There is a method of forming a tapered shape opposite to the taper of the rotor and crushing the gravel by cooperation of both. An excavator has also been proposed in which the cutter head is concentrically rotated to excavate the ground, and the excavated earth and sand taken into the excavation chamber can be crushed by a cone rotor which is separately provided from the cutter head. Nippon 8-60532
issue).

In Japanese Patent Application Laid-Open No. 7-26891, an overhang bar is provided on the back of the cutter head, and a projection is provided on the lower half of the muddy water chamber and on the front of the bulkhead.
A void is formed between adjacent protrusions to allow large-diameter gravels to partially enter, and an impact load is applied to the large-diameter gravels with an overhanging bar in a state where the large-diameter gravels are sandwiched, thereby crushing the large-diameter gravels. A mud shield shield machine configured to obtain the same has been proposed.

[0007]

In an excavator, it is necessary to discharge earth and sand and gravel taken into a shaving chamber without stagnation. In particular, a cutter head employing a roller bit, a scraper, or the like is generally configured in a face plate shape in order to attach these excavated members. The opening for taking in cannot be made large. For this reason, if the earth and sand taken into the earth shaving chamber cannot be discharged smoothly to the outside, new earth and sand cannot be taken into this earth shaving chamber,
There is a problem that the excavator cannot be propelled.

[0008] As described above, when the earth and sand taken into the earth shaving chamber is discharged to the outside without staying, a screw conveyor is provided in the earth shaving chamber to forcibly convey the earth and sand. It cannot be used when the volume of the earth shaving chamber is large and the diameter of the pipe to be propelled is small.

[0009] When the ground contains a bedrock layer, excavated earth and sand are mixed with gravel, and there is a problem in how to crush the gravel. In particular, when a bedrock layer and a cohesive soil layer are mixed, the development of an excavator that can cope with problems such as crushing of excavated gravel and deterioration of fluidity due to adhesion of cohesive soil has been requested. I have.

[0010] An object of the present invention is to provide an excavator capable of forcibly fluidizing earth and sand taken into a shaving chamber and discharging the earth in a good state, and capable of crushing gravels contained in earth and sand. To provide.

[0011]

In order to solve the above problems, an excavator according to the present invention has a cutter head rotatably provided at a tip of a shield body and a partition wall provided at a predetermined position. In the excavator configured to provide a shaving chamber including a cutter head and a part of the shield body between the excavated soil in the shaving chamber and to discharge through the inside of the shield body, A cutter head and a driving means for driving the cutter head, and an electric motor is mounted below the driving means, and the driving shaft of the electric motor has a tapered surface having a small diameter at the tip and a large diameter at the original end. Attach the agitating blade facing the tapered surface of the cone rotor to the tip of the drive shaft. The corresponding portions and conical rotor is obtained by forming the diameter is small funnel-shaped portion corresponding to the diameter of large and Mototan side of the portion corresponding to the tip end of the conical rotor.

In the above-mentioned excavator, a cone rotor driven by an electric motor provided independently of a driving means for driving the cutter head is provided below the cutter head, and a taper of the cone rotor is provided on a drive shaft of the electric motor. A stirring blade is provided facing the surface, and the cone rotor is formed in a tapered taper shape with the tip diameter smaller than the original end diameter, and a portion corresponding to the cone rotor in the earth shaving chamber is provided at the tip of the cone rotor. The funnel was formed in a funnel shape where the diameter of the corresponding part was large and the diameter of the part corresponding to the original end was small, so the electric motor was driven so that the stirring blades were formed in the cone rotor and part of the earth shaving chamber. Can be rotated between parts. For this reason, the sediment taken in the site is always given fluidity by the stirring blade, and does not stay in the site.

In the above-mentioned excavator, it is preferable to provide a discharge port for discharging earth and sand and muddy water at a portion of the funnel-shaped portion corresponding to the base end of the cone rotor. By configuring the excavator in this way, the flow direction of the earth and sand and the muddy water inside the excavation room can be defined.

For this reason, the earth and sand taken in between the cone rotor and the funnel-shaped part is agitated by a stirring blade to impart fluidity, and at the same time, is forcibly poured into the discharge port by the flow of muddy water and smoothly passed through the mud pipe. Can be discharged outside.

[0015] Further, a plurality of projections provided on the inner peripheral surface of the shield body for regulating the earth removal chamber, and a projection provided on an arm formed on the cutter chamber side of the cutter head so as to oppose the projection and be provided with the projections. And a crushing wing arranged at a predetermined distance from the crushing wing.

In the above-mentioned excavator, a plurality of projections are provided on the inner peripheral surface of the shield body for regulating the outer periphery of the earth shaving chamber.
Since the crushing wings provided on the arm formed on the cutter head are opposed to the projection pieces and are separated by a predetermined distance, the excavated earth and sand including the gravels generated along with the excavation of the ground is removed from the intake formed on the cutter head. When the excavated soil contains large gravel when taken into the earth shaving chamber, when the gravel is sandwiched between the projecting piece and the crushing wing, they are crushed by the cooperation of both. Therefore, it is possible to crush the gravel into small-sized gravels, and when a crushing member is provided separately from the cutter head, the crushed stones are preliminarily crushed before reaching the crushing member. Crushing efficiency can be improved.

In addition, the inside of the shaving chamber can be stirred by the crushing wing with the rotation of the cutter head. For example, when excavating a ground made of a viscous soil layer, it is taken into the inside of the shaving chamber. The viscous soil can maintain its fluidity and can be easily discharged to the ground.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above-described excavator will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the overall configuration of the excavator. FIG. 2 is a view of the cutter head viewed from the front side. FIG. 3 is an enlarged view of a main part inside the earth shaving chamber. FIG. 4 is a diagram illustrating the flow of the muddy water in the earth shaving chamber and the configuration of the cone rotor and the stirring blade. FIG. 5 is a view showing the relationship between the projection piece and the stirring blade, and is a view taken along the line VV in FIG. 3.

The excavator A according to the present embodiment imparts fluidity to soil and gravels excavated and taken into a shaving chamber when excavating a ground including a bedrock layer and a cohesive soil layer, so that the excavator A smoothly moves. A plurality of protruding pieces and a cutter head provided on the inner peripheral surface of the shield main body that are configured to be able to be discharged, crush the gravel by a cone rotor provided independently of the cutter head, and define the outer periphery of the soil removal chamber The crusher is configured to be able to be crushed in cooperation with the crushing wing provided in the above.

First, the overall configuration of the excavator A will be schematically described with reference to FIGS. The excavator A is configured such that the shield main body 1 and the tail shield 2 are connected to each other by a plurality of jacks 3 and a rod (not shown) so that the shield main body 1 and the tail shield 2 can be refracted from each other. Have been. A propulsion pipe B is connected to the rear end of the tail shield 2, and thrust generated from a main pushing device installed in the starting shaft is transmitted to the tail shield 2 directly or through the propulsion pipe B. You.

The shield body 1 is separated from the cabin 6 by a partition wall 5.
A motor 8 for driving the cutter head 4, an electric motor 10 for driving the cone rotor 9 and the stirring blade 18, and a mud supply for supplying muddy water to the soil shaving chamber 7 are provided in the cabin 6. A pipe 11 and a mud pipe 12 for discharging muddy water mixed with excavated earth and sand and crushed gravels in the shaving chamber 7 are arranged. The mud pipe 11 is connected above the partition wall 5 to supply muddy water to the upper part of the earth shaving chamber 7, and the mud pipe 12 is connected below the partition wall 5 to provide muddy water and excavated sediment at the lower part of the earth shaving chamber 7. Is sucked and discharged.

Further, in the interior of the cabin 6, there are provided devices for detecting a deviation of the propulsion direction of the excavator A from the laid line and, when the deviation is detected, the excavator A is propelled in the direction of the laid line. Devices 13 for controlling the direction and devices 13 such as a hydraulic unit for supplying pressure oil to the jack when controlling the propulsion direction of the excavator A are arranged.

The cutter head 4 is for excavating the ground consisting of a bedrock layer, a clayey layer and the like to form a hole having a diameter larger than the outer diameter of the shield body 1 and the tail shield 2. Boss 4a fixed to a shaft (not shown) supported by the boss, a disk-shaped face plate 4b fixed to the tip of the boss 4a, and connecting the boss 4a and the face plate 4b so that the face plate 4b is And a plurality of arms 4c for reinforcement.

The shaving chamber 7 has its front surface regulated by the face plate 4b of the cutter head 4 and its rear surface formed by the shield body 1.
The outer periphery is further restricted by a peripheral wall 1a which is a part of the shield main body 1. Accordingly, the shaving chamber 7 is a space surrounded by the cutter head 4 and the shield main body 1. Gravel and excavated earth and sand are taken in through an inlet 16 formed in a face plate 4 b of the cutter head 4, which will be described later. The excavated earth and sand is crushed by the cone rotor 9 and stirred by the stirring blades 18 to secure fluidity, and furthermore, can be discharged to the ground via the drain pipe 12.

At a predetermined position of the cutter head 4, a roller bit 14 serving as a digging member suitable for digging a rock layer is detachably mounted. Also, a rock layer other than a rock layer including a viscous soil layer is drilled. Each of them is provided with a predetermined number of scrapers 15 that are suitable for the operation. An intake 16 for taking excavated rock fragments, gravels, or earth and sand into the earth shaving chamber 7 is formed at a mounting portion of the scraper 15 on the face plate 4b.

The inlet 16 is formed as an elongated opening having a width of about 70 mm over the radial direction of the face plate 4b. From the intake port 16, long and narrow gravel with a maximum length of 170 mm to 180 mm can be excavated.
Corn rotor 9 in many cases. However, if the size of the intake 16 is made smaller, it may be difficult to take in the excavated earth and sand when excavating the cohesive soil layer, and it is difficult to change the current size.

In the excavator A configured as described above, muddy water is supplied to the periphery of the cutter head 4 and the cutter head 4 is rotated while applying a thrust from the rear end side of the tail shield 2, thereby forming a bedrock layer or a viscous soil. Excavates the ground consisting of layers, takes in the excavated gravel and earth and sand into the shaving chamber 7, crushes or consolidates the taken in gravel and excavated earth with the cone rotor 9 and discharges them through the mud pipe 12 to the outside. It is possible to promote by doing. When it is detected that the excavator A is displaced from the planned laying line as the excavator A is propelled, the direction control jack is driven to appropriately set the angle between the shield main body 1 and the tail shield 2 for propulsion. By doing so, the excavator A can be propelled along the planned laying line.

Next, the configuration of the cone rotor 9 provided in the earth removal chamber 7 will be described with reference to FIGS. The cone rotor 9 crushes the gravel taken into the crushing chamber 7 to an appropriate size, and is disposed below the cutter head 4 provided at substantially the center of the partition wall 5 (below the earth shaving chamber 7). I have.

The cone rotor 9 includes an electric motor 10
A cone rotor 9 which is rotatably mounted on an eccentric shaft (not shown) driven by the motor and is formed in a truncated cone shape having a small diameter on the tip side (the cutter head 4 side) and a large diameter on the original end side (the partition 5 side). A funnel-shaped crushing wall 17 which is a part of the crushing chamber 7 and surrounds the cone rotor 9 and has a diameter decreasing from the side facing the soil shaving chamber 7 toward the back is formed. An electric motor with a cone rotor 9
A boss 18a is fixed to the tip of the eccentric shaft driven by 10, and a stirring blade 18 is arranged on the boss 18a. Therefore, when the electric motor 10 is driven, the stirring blade 18 rotates concentrically with this drive, and the cone rotor 9 moves eccentrically.

The space defined by the tapered surface 9a of the cone rotor 9 and the crushing wall 17 functions as a stirring chamber 19, and extends from the earth shaving chamber 7 side to the back side of the cone rotor 9 and the crushing wall 17. It is formed so that the dimensions are sharply reduced by the tapered surface, and crushes the gravel contained in the earth and sand taken into the stirring chamber 19 between the tapered surface 9 a of the cone rotor 9 and the crushing wall 17. It is configured to be able to.

The sludge pipe 12 is opened below the stirring chamber 19 and at the base end of the cone rotor 9.
The opening 12 functions as an outlet 12a. The sludge pipe 12 is forcibly sucked by a sludge pump (not shown),
It is configured such that muddy water, earth and sand, and gravel that have reached the vicinity of the discharge port 12a can be discharged to the outside.

The stirring blade 18 is fixed to a boss 18a fixed to the tip of an eccentric shaft driven by the electric motor 10. For this reason, while the electric motor 10 is being driven, the stirring blade 18 keeps the stirring chamber irrespective of the rotation of the cone rotor 9.
It is possible to rotate the inside of 19 and agitate the earth and sand in the stirring chamber 19 with this rotation to impart fluidity.

In this embodiment, the mud pipe 11 and the mud pipe 12
The bore diameter is set larger than a mud pipe and a drain pipe of a semi-shielded excavator employing a normal muddy water method and having the same specifications. For example, in a normal excavator, the diameter of each pipe generally adopts a 50A size,
In this embodiment, a tube having a size of 100A is used. The amount of mud supplied to the shaving chamber 7 is, for example, typically 0.2
While it is about cubic meter to 0.25 cubic meter,
In the present embodiment, it is set to about 1.4 cubic meters to 2.0 cubic meters.

In this embodiment as described above, the amount of mud per unit time flowing through the earth removal chamber 7 is increased. That is, the flow velocity of the muddy water in the shaving chamber 7 increases, and the sediment taken in the shaving chamber 7 is forcibly given fluidity by the flow of the muddy water and easily moves to the stirring chamber 19. Stirring blades in stirring chamber 19
Fluidity is given by the rotation of 18, and further, fluidity is given by forced suction by a sludge pump acting on the sludge pipe 12. Therefore, the earth and sand (excluding gravel) taken into the earth shaving chamber 7 is immediately discharged to the outside.

The gravel taken into the shaving chamber 7 and moved to the stirring chamber 19 is separated from the tapered surface 9 a of the cone rotor 9 and the crushing wall 17.
And crushed. That is, when the electric motor 10 is driven, the cone rotor 9 rotates eccentrically according to the rotation of the eccentric shaft, while the gravel is stirred in the stirring chamber 19 in accordance with the advance of the excavator A.
Invades the back of If the gap is larger than the distance between the tapered surface 9a of the cone rotor 9 and the crushing wall 17 at the position where the gravel has entered, it is crushed by being sandwiched between the tapered surface 9a of the cone rotor 9 and the crushing wall 17.

As described above, the crushing of the gravel is repeated, and the crushed gravel reaches the discharge port 12a until it can pass through the gap between the tapered surface 9a of the cone rotor 9 and the crushing wall 17, and is discharged together with the muddy water. Discharged to the ground through pipe 12.

In particular, it is possible to increase the diameter of the gravel that can flow through the inside of the drain pipe 12 by increasing the diameter of the drain pipe 12, and to discharge the sand and crushed gravel more smoothly. Is possible.

The electric motor 10 is a variable-speed motor, and the cone rotor 9 and the stirring blade 18 are rotated at an optimum rotation speed in accordance with the quality of the soil fluidity in the earth shaving chamber 7 and the stirring chamber 19. It is configured to rotate with.

Next, the projecting pieces provided in the shaving chamber 7 and the stirring blades provided in the cutter head 4 will be described with reference to FIG.

In the figure, a plurality of projections 21 are provided at predetermined intervals on the inner peripheral surface of a peripheral wall 1a which is a part of the shield main body 1 which defines the outer periphery of the earth shaving chamber 7. A crushing wing 22 is provided on the arm 4c of the cutter head 4 so as to face the projection 21. Before the gravel taken into the shaving chamber 7 reaches the cone rotor 9, the gravel is
It is configured such that the crushing can be preliminarily crushed by cooperation of the crushing blade 22 and the crushing wing 22.

The protruding piece 21 is formed in a square rod shape from a wear-resistant steel material, and the protruding piece 21 is fixed to the peripheral wall 1a by welding. Projection piece 21 fixed to peripheral wall 1a
There is no particular limitation on the size of the cone rotor 9 and the distance between the adjacent protrusions 21. The size of the cone rotor 9 set according to the excavation diameter of the excavator A (the crushing ability of the cone rotor 9) is appropriately determined. This is a design item to be set.

The installation position of the projection piece 21 with respect to the peripheral wall 1a is not particularly limited. That is, the projecting piece 21 may be fixed to the entire inner peripheral surface of the peripheral wall 1a, or the projecting piece 21 may be fixed to a portion corresponding to the lower half of the earth shaving chamber 7.

A plurality of arms 4c are formed on the side of the shaving chamber 7 of the cutter head 4, and crushing wings are provided on the arms 4c.
22 are provided. The crushing wing 22 includes a plurality of arms 4
c, or may be provided selectively from the plurality of arms 4c. In this embodiment, all the arms 4
The crushing wings 22 are not provided but are selectively provided in the c.

The crushing wings 22 are provided on the arm 4c so as to be opposed to the projecting pieces 21 provided on the peripheral wall 1a of the earth shaving chamber 7 and to be able to maintain a predetermined interval between the projecting pieces 21. ing. The crushing wing 22 is formed in a rectangular shape by abrasion-resistant steel material like the projection piece 21.
22 is fixed to the arm 4c by means such as welding.

The distance of the crushing wings 22 from the projecting pieces 21 is not particularly limited. That is, the distance is a matter to be appropriately set according to the crushing ability of the cone rotor 9 set according to the excavation diameter of the excavator A.

In the figure, reference numeral 23 denotes a plurality of agitating blades provided on the arm 4c, which are taken into the earth shaving chamber 7 by stirring the inside of the earth shaving chamber 7 with the rotation of the cutter head 4. The viscous soil is mainly flown, thereby preventing the viscous soil from being condensed inside the shaving chamber 7 and being unable to be discharged.

In the excavator A configured as described above, the cutter head 4 is driven by supplying muddy water to the shaving chamber 7, and when a thrust is applied from a main pushing device installed in the starting shaft, the cutter head 4 Roller bit 14, attached to
The ground is excavated by the scraper 15, and excavated earth and sand including gravel is taken into the earth shaving chamber 7 from the intake 16.

When the rock pieces 24 contained in the excavated earth and sand engage with the projections 21 provided on the peripheral wall 1a of the earth shaving chamber 7 and stop, the cutter head 4 rotates and the crushing blades 22 provided on the arm 4c are moved. It collides with the gravel 24, and it is possible to crush the gravel 24 by the impact force at this time.

The excavated earth and sand including the gravel taken into the earth shaving chamber 7 and the gravel crushed by the projections 21 and the crushing wings 22 move in the direction of the cone rotor 9 with the propulsion of the excavator A, The water is supplied to a stirring chamber 19 constituted by the tapered surface 9 a of the cone rotor 9 and the crushing wall 17. This stirring chamber
At 19, the sediment is agitated by the agitating blades 18 to impart fluidity, and the gravel is further crushed by being sandwiched between the tapered surface 9a of the cone rotor 9 and the crushing wall 17, and reaches the discharge port 12a to be discharged. It is discharged to the ground through the mud pipe 12.

[0050]

As described in detail above, in the excavator according to the present invention, a cone rotor driven by an electric motor is arranged below the cutter head, and a funnel-shaped wall is formed around the cone rotor. Furthermore, since the stirring blade is provided facing the tapered surface of the cone rotor, by rotating the stirring blade, fluidity is imparted to the earth and sand taken into the earth shaving chamber, thereby easily discharging the soil to the outside. I can do it.

Further, by providing a discharge port for earth and sand near the base end of the cone rotor, the flow path of the muddy water in the shaving chamber is defined, and the muddy water provided with fluidity by the stirring blade and the cone rotor are provided. The crushed gravels sandwiched between the tapered surface and the funnel-shaped wall can be easily discharged.

Also, a plurality of projections are provided on the inner peripheral surface of the earth shaving chamber, and the crushing wing is provided on the arm of the cutter head at a predetermined distance from the projections and opposed to the projections.
When the gravel taken into the shaving chamber along with the excavation of the ground is stopped by engaging with the projecting pieces, the gravel can be crushed by applying an impact with a crushing wing. Therefore, preliminary crushing can be performed prior to crushing of the cone rotor, and crushing efficiency can be improved and good excavation can be realized.

Further, the crushing blade agitates the inside of the earth shaving chamber with the rotation of the cutter head, so that even when the excavated earth and sand is a viscous soil, the viscous soil can be fluidized to obtain a favorable soil. Can be discharged in a state. Therefore, good excavation can be realized even when the ground is a mixture of a bedrock layer and a cohesive soil layer.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of an excavator.

FIG. 2 is a front view of the cutter head.

FIG. 3 is an enlarged view of a main portion inside a shaving chamber.

FIG. 4 is a diagram illustrating a flow of muddy water in a soil shaving chamber and a configuration of a cone rotor and a stirring blade.

FIG. 5 is a view showing a relationship between a projection piece and a stirring blade, and is a view taken in the direction of arrow VV in FIG. 3;

[Explanation of symbols]

 Reference Signs List A Excavator B Propulsion pipe 1 Shield body 1a Peripheral wall 2 Tail shield 3 Jack 4 Cutter head 4a Boss 4b Face plate 4c Arm 5 Partition wall 6 In-machine room 7 Soil cutting room 8,10 Motor 9 Cone rotor 9a Tapered surface 11 Mud pipe 12 Discharge Mud pipe 12a Outlet 13 Equipment 14 Roller bit 15 Scraper 16 Inlet 17 Crush wall 18 Stirrer blade 18a Boss 19 Stirrer chamber 21 Projection piece 22 Crusher blade 23 Stirrer blade 24 Rock chip

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hajime Kawato 4-31-6 Yoyogi, Shibuya-ku, Tokyo Nishishin Sukumatsuya Building F-term in Iseki Development Machinery Co., Ltd. 2D054 AC05 DA12 DA37

Claims (3)

[Claims] 1. A shield head is rotatably provided at a tip of a shield body, a partition wall is provided at a predetermined position, and a shaving chamber comprising a cutter head and a part of the shield body is provided between the partition wall and the cutter head. In an excavator configured to discharge excavated earth and sand in a shaving chamber through the inside of a shield body, a cutter head and driving means for driving the cutter head are provided substantially at the center of the partition wall, and the driving means An electric motor is attached below, and a cone rotor having a tapered surface with a small diameter at the tip and a large diameter at the original end is attached to the drive shaft of the electric motor, and a tapered surface of the cone rotor at the tip of the drive shaft. Attach the opposing stirring blades, and further place a part corresponding to the cone rotor, which is a part of the earth shaving chamber of the shield body, on the tip side of the cone rotor. An excavator characterized in that it has a funnel shape in which the diameter of the corresponding part is large and the diameter of the part corresponding to the base end side is small. 2. A discharge port for discharging earth and sand and muddy water is provided at a part of the funnel-shaped shaving chamber, which corresponds to a root end of a cone rotor. The excavator described. 3. A plurality of projections provided on an inner peripheral surface of a shield main body for regulating the earth removal chamber, and a plurality of projections provided on an arm formed on a side of the earth removal chamber of a cutter head so as to face and be opposed to the projections. A crushing wing arranged at a predetermined distance from the projection piece,
The excavator according to claim 1 or 2, further comprising: