JP3716668B2 - Shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine, and more particularly to a technique for improving earth discharge means of an earth pressure shield machine.
[0002]
[Prior art]
In the earth pressure type shield machine, the excavated earth and sand taken into the chamber is usually discharged into the mine using a screw conveyor. In this case, the excavated soil is discharged by opening and closing the discharge port of the screw conveyor intermittently while maintaining the earth pressure in the chamber at a predetermined value or more in order to ensure the stability of the face.
[0003]
By the way, even in the case where the opening and closing control of the discharge port of the screw conveyor is performed in this way, in order to prevent the influence when the discharge port is released directly from entering the chamber, the screw conveyor is For this reason, the screw conveyor usually protrudes backward from the rear end of the shield machine.
[0004]
Then, the excavated sediment discharged from the screw conveyor into the mine is moved backward by a belt conveyor or the like, and is carried out of the mine using a grinding steel wheel or a sediment pressure pump.
[0005]
However, such a conventional earth pressure shield machine has technical problems described below.
[0006]
[Problems to be solved by the invention]
That is, if the screw conveyor protrudes rearward from the rear end of the shield machine, the rear end side of the screw conveyor interferes with the inner winding wall in sharp curve construction, making it difficult for the shield machine to dig. It is necessary to take measures such as replacing the with a shorter one.
[0007]
The present invention has been made in view of such conventional problems, and the object of the present invention is to provide a shield machine capable of performing sharp curve construction and enabling continuous excavation. There is to do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is connected to each other by a folding jack and is formed in a cylindrical shape with a front and rear skin plates and a front end of the front skin plate rotatably. A shield machine provided on the back side of the cutter and filled with excavated earth and sand to counteract earth pressure, and directly communicates with the interior of the chamber, and the total length of the front skin plate A pressure-adjusting uniaxial eccentric screw pump located inside, and at one end of a flexible earth and sand carrying-out pipe whose other end extends to the rear of the subsequent carriage and is opened at the discharge port of the pressure-adjusting uniaxial eccentric screw pump. Connected.
According to the shield machine configured as described above, the pressure-adjusting uniaxial eccentric screw pump that directly communicates with the inside of the chamber is provided, and the flexible earth and sand carrying out to the rear of the succeeding carriage is provided at the discharge port of the pressure-adjusting uniaxial eccentric screw pump. Since the pipes for communication are connected in communication, the frictional force between the excavated earth and sand to be discharged and the pipe for carrying out the earth and sand becomes very large.
Therefore, even if the inside of the chamber is released with the sediment transport pipe filled with the excavated sediment via the pressure-adjustable uniaxial eccentric screw pump, the excavated sediment discharged through this piping is limited, and the chamber The internal pressure is not so low as to impair the stability of the face.
Further, in the shield machine of the present invention, since the pressure adjusting type uniaxial eccentric screw pump that is directly communicated with the inside of the chamber and is located in the front skin plate is provided, it does not affect the sharp curve construction of the shield machine, Further, since the piping for excavating earth and sand has flexibility, it does not affect the sharp curve construction of the shield machine even if it extends to the rear of the subsequent carriage.
Furthermore, in the shield machine according to the present invention, the excavated earth and sand are continuously discharged through the pipe whose rear end is released from the chamber, so that the shield machine can continuously dig.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a shield machine according to the present invention.
[0010]
The shield machine shown in the figure includes an excavator body 10, a cutter 12, a chamber 14, a pump 18 for sediment transport, and a sediment transport pipe 20.
[0011]
As shown in detail in FIG. 2, the excavator main body 10 has cylindrical front and rear skin plates 10 a and 10 b that are divided at axially intermediate positions and open at both ends. The rear skin plates 10a and 10b are connected to each other by a folding jack 21 installed inside the skin plates 10a and 10b.
[0012]
A plurality of the bent jacks 21 are provided at a predetermined interval in the circumferential direction, and are used when excavating in a curved shape. Inside the front skin plate 10a, a shield jack 24 is provided on the rear end side of the rear skin plate 10b to take a reaction force on the segment 23 that is assembled in an annular shape using the erector 22 to propel the shield machine. .
[0013]
A plurality of the shield jacks 24 are arranged at predetermined intervals in the circumferential direction. A partition wall 26 that separates the chamber 14 is provided on the front end side of the front skin plate 10a.
[0014]
The cutter 12 includes a spoke portion 12a formed in a cross shape, a rotary shaft 12b projecting from the center of the back side of the spoke portion 12a, and a cutter bit 12c fixed to the side surface and the front surface of the spoke portion 12a. It has.
[0015]
In the spoke part 12a of the cutter 12, a copy cutter 12d that is provided so as to be able to protrude and retract in the radial direction and enables excavation outside the excavable range of the cutter 12 is incorporated.
[0016]
Further, a plurality of support stays 12e are provided on the back surface side of the spoke portion 12a of the cutter 12 at predetermined intervals on the same circumference, and an annular ring is provided at the end of the support stay 12e. A beam 12f is fixed.
[0017]
The cutter 12 configured in this manner is rotatably supported by the partition wall 26 with the rotating shaft 12b and the ring beam 12f interposed with a bearing or the like.
[0018]
A ring gear 12g is fixed to one end side of the ring beam 12f, and a driving gear 12i fixed to the rotating shaft of the drive motor 12h is engaged with the ring gear 12g.
[0019]
The rear end side of the chamber 14 is separated by a partition wall 26, and the earth and sand excavated by the cutter 12 arranged on the front side is taken in and filled, and is opposed to the earth pressure on the face side. Stabilize.
[0020]
The pump 18 for pressure-and-sand transport is a pressure-adjusting uniaxial eccentric screw pump, and is installed so as to directly communicate with the interior of the chamber 14, and its detailed structure is shown in FIG.
[0021]
The pump 18 shown in the figure includes a hollow cylindrical casing 18c having a suction port 18a opened on one end side and a discharge port 18b opened on a side surface at an intermediate position.
[0022]
The suction port 18a of the casing 18c is directly attached to a through hole provided in the partition wall 26, and the casing 18c and the chamber 14 are in direct communication. A stator 18d and a rotor 18e are installed in the casing 18c.
[0023]
The stator 18d is made of an elastic material, is formed into a bent oval female screw shape, and is fixed to the inner periphery of the casing 18c. The rotor 18e is made of a metal having a perfect circular cross section, has a male screw shape bent in a corrugated shape, and is disposed so as to penetrate the center of the stator 18d.
[0024]
On the rear side of the casing 18c, a drive shaft 18g connected to a drive motor 18f is rotatably supported via a bearing, and the drive shaft 18g and the rotor 18e are connected via a universal joint 18h. Has been.
[0025]
In addition, the member shown with the code | symbol 18i in FIG. 4 is the sealing material interposed between the drive shaft 18g and the casing 18b.
[0026]
In the earth and sand pump 18 configured as described above, when the drive shaft 18g is rotated by the drive motor 18f, the rotor 18e is rotated in a snake-like manner, and the stator 18 made of an elastic member is deformed. The earth and sand in the chamber 14 is sucked from the suction port 18a side and pumped to the discharge port 18b.
[0027]
The earth and sand transport pipe 20 is composed of a cylindrical body made of synthetic resin having flexibility, and one end side is connected to the discharge port 18b of the pump 18, and the rear end side is as shown in FIG. It extends to the rear of the succeeding carriage 28, and the rear end is released at that position.
[0028]
For example, a belt conveyor is arranged on the lower side of the open end of the earth and sand transport pipe 20 and the accepted excavated earth and sand are carried out of the mine or carried out of the mine using a shear steel wheel. .
[0029]
In the shield machine configured as described above, the earth and sand excavated by rotating the cutter 12 are sequentially taken into and filled in the chamber 14 provided on the back side of the cutter 12.
[0030]
If the excavation by the shield machine proceeds and the excavated earth and sand taken into the chamber 14 becomes excessive, a part of the excavated earth and sand is sequentially fed to the earth and sand transport pipe 0 side via the pump 18.
[0031]
When such excavation earth and sand moves sequentially with the excavation of the shield machine, the excavation earth and sand moves to the open end extended to the rear of the succeeding carriage 28 while filling the inside of the earth and sand transport pipe 20. Then, it is carried out of the mine by a belt conveyor or the like.
[0032]
In this case, according to the shield machine of the present embodiment, the pressure-adjusting uniaxial eccentric screw pump 18 that directly communicates with the inside of the chamber 14 is provided, and the flexibility that extends to the rear of the succeeding carriage 28 at the discharge port 18b of the pump 18 is provided. Therefore, the friction force between the excavated earth and sand to be discharged and the sediment transport pipe 20 becomes very large.
[0033]
Therefore, even if the inside of the chamber 14 is released by the sediment transport pipe 20 filled with the excavated sediment, the excavated sediment discharged through the piping 20 is limited, and the pressure in the chamber 14 is limited to the face. It will not be so low as to impair the stability of
[0034]
Further, in the shield machine of the present embodiment, the uniaxial eccentric screw pump 18 that communicates directly with the inside of the chamber 14 is provided, so that it does not affect the sharp curve construction of the shield machine, and the excavation sediment carrying pipe 20 is Since it has flexibility, even if it extends to the rear of the succeeding carriage 28, it does not affect the sharp curve construction of the shield machine.
[0035]
Furthermore, in the shield machine of the present invention, the excavated earth and sand are continuously discharged from the chamber 14 through the pipe 20 whose rear end is released, so that the shield machine can continuously dig.
[0036]
【The invention's effect】
As described above in detail in the embodiment, according to the shield machine according to the present invention, it is possible to perform sharp curve construction and continuous excavation.
[Brief description of the drawings]
FIG. 1 is an overall view showing an embodiment of a shield machine according to the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
3 is a plan view of the front end side of the shield machine shown in FIG. 1. FIG.
4 is a cross-sectional view of the earth and sand pump for the shield machine shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Excavator main body 12 Cutter 14 Chamber 18 Pump 20 Transfer piping 22 Elector 24 Shield jack 26 Bulkhead 28 Subsequent trolley

Claims (1)

An excavator main body having front and rear skin plates connected to each other by a bent jack and formed into a cylindrical shape ;
A cutter installed rotatably at the tip of the front skin plate ;
In the shield machine provided with a chamber provided on the back side of the cutter and filled with excavated earth and sand to counteract earth pressure,
A pressure-adjusting uniaxial eccentric screw pump that communicates directly with the interior of the chamber and whose entire length is located in the front skin plate ;
1. A shield machine according to claim 1, wherein one end side of a flexible earth and sand carrying pipe having the other end extending to the rear of the subsequent carriage is connected to the discharge port of the pressure-regulating uniaxial eccentric screw pump.

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