JP3189482B2 - Sediment transport equipment of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sediment transporting apparatus for a shield excavator in which a mounting angle of a pressure pump suspended from a screw conveyor can be freely adjusted in accordance with a curve of a tunnel.

[0002]

2. Description of the Related Art As shown in FIG.
Rotates a cutter c provided on a front surface of a shield frame b formed in a cylindrical shape to excavate a face, and once takes in the excavated earth and sand into a cutter room d provided on a back surface of the cutter, and The earth and sand in d is discharged to the rear in the excavation direction via the screw conveyor e and the pressure pump f.

The pressure pump f is suspended and connected to a discharge port g of a screw conveyor e, and intermittently intercepts earth and sand discharged from the discharge port g by a reciprocating piston h provided therein through a pipe i. It feeds backward. A companion flange k is provided between the discharge port g of the screw conveyor e and the input port j of the pressure pump f to communicate them.

The passage portion 1 of the companion flange k is formed in a square cylindrical shape in order to increase the amount of soil that passes through in accordance with the shape of the screw gate m. Therefore, the flange portion n of the companion flange k is also formed in a square shape in accordance with the cross-sectional shape of the passage portion l. The companion flange k is firmly fastened to the flange p of the inlet / outlet ports j and g by a plurality of bolts o arranged in a square at a predetermined pitch on the flange portion n.

[0005]

By the way, in recent years, a sharp excavation of a tunnel has been performed, and an excavator a provided with a center bending mechanism q as shown in FIG. When a sharp curve excavation is performed by using the excavator a, the rear end of the pumping pump f that projects backward from the shield frame b hits an existing segment outside the curve. Therefore,
Conventionally, at the time of excavating a sharp curve, the companion flange k was once removed and replaced with another companion flange twisted according to the shape of the curve.

[0006] However, in this case, about 1 t each time a curve is excavated.
In addition, a certain pump must be separated from the screw conveyor e to be lifted and lowered, so that the operation is complicated and the operation time is prolonged, which is not efficient. Further, it is not economical because it is necessary to prepare a plurality of companion flanges k matching the shapes of various curves in advance. As a countermeasure, it is conceivable to connect the screw conveyor e and the pressure feed pump f via a universal joint that can swing freely. However, since the vibration of the pressure feed pump f is extremely severe, the seal portion of the universal joint is broken, Not practical.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of the above circumstances, is to provide a sediment transport device for a shield excavator in which the mounting angle of a pump for a screw conveyor can be easily adjusted in accordance with the curve of a tunnel. Is to do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a screw pump for discharging earth and sand is further hung and connected to a screw conveyor for discharging earth and sand in a cutter chamber backward. In the earth and sand conveying device of the shield excavator, a circular flange is provided at a connection portion between the screw conveyor and the pressure pump so that the mounting angle of the pressure pump with respect to the screw conveyor can be freely set at a predetermined pitch. A bolt to be fastened is provided at a predetermined pitch along the circumferential direction of the circular flange, and a bracket having a U-shaped cross section for preventing the pressure pump from dropping when the bolt is removed is provided so as to sandwich the circular flanges. I have.

[0009]

Since the flange connecting the screw conveyor and the pressure pump is circular and the bolts for fastening them are provided at predetermined intervals, the two circular flanges are relatively rotated to perform the pressure feeding to the screw conveyor. The mounting angle of the pump can be changed in bolt pitch units.

[0010] Further, the pressure feed pump which tends to drop from the screw conveyor when the bolt is removed is hung on the screw conveyor by a bracket having a U-shaped cross section provided so as to sandwich both circular flanges.

[0011]

An embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a sediment transporting apparatus 1 according to this embodiment.
The outline of the shield machine 2 provided with is shown. As shown in the drawing, a cutter 4 that is rotationally driven by a motor is provided on the front surface of the cylindrical shield frame 3. The earth and sand of the cutting face excavated by the cutter 4 is taken into a cutter chamber 6 formed by partitioning the back of the cutter 4 from the inside of the pit by a partition wall 5. The earth and sand in the cutter chamber 6 is transported rearward in the excavation direction via a screw conveyor 7 and a pressure pump 8 suspended therefrom. The pressure pump 8 intermittently pressure-feeds the earth and sand discharged from the conveyor 7 to the rear through a pipe 10 by reciprocating a built-in piston 9.

The screw discharge port 7a of the screw conveyor 7 and the discharge port 8a of the pressure feed pump 8 are connected to the screw gate 11
It is formed in a square shape to increase the amount of passing soil according to the shape of. The screw gate 11 is slidably provided to open and close the discharge port 7 a of the screw conveyor 7, and by opening and closing as appropriate, maintains the earth pressure in the cutter chamber 6 and stably holds the face. Conveyor discharge port 7
The circular flanges 12 and 13 for connecting them are provided at the pump inlet 8a and the pump inlet 8a, respectively. These circular flanges 12 and 13 are fastened by bolts 14 provided at a predetermined pitch along the circumferential direction. These bolts 14 are arranged on the same radius from the centers of the circular flanges 12 and 13 at an equal pitch P. Therefore, even if the two circular flanges 12 and 13 are relatively rotated to shift the phase, there is no problem in fastening them.

The circular flanges 12 and 13 are provided such that brackets 15 having a U-shaped cross section sandwich the flanges. In the present embodiment, four brackets 15 are provided at 90-degree intervals in the circumferential direction of the circular flanges 12 and 13, but four or more brackets may be provided, and of course, may be formed in a ring shape. These brackets 15 are detachable with respect to the circular flanges 12 and 13, and are usually removed and engaged with the circular flanges 12 and 13 by an operator when the pump 8 is deflected. The sandwiching interval x (U-shaped interval x) of the bracket 15 is formed slightly wider than the thickness when the flanges 12 and 13 are brought into close contact.

The operation of this embodiment having the above configuration will be described.

The front cylinder 3a is driven by the bending mechanism 16 of the excavator 2.
On the other hand, when the rear cylinder 3b is bent to make a sharp curve excavation, the rear end of the pump 8 protruding backward from the rear cylinder 3b hits an existing segment outside the curve.
The mounting angle of the pump 8 to the screw conveyor 7 is changed to the inside of the curve as follows.

First, the discharge port 7a of the screw conveyor 7
The four brackets 15 having a U-shaped cross section are attached at 90 intervals to the circular flange 12 provided at the bottom and the circular flange 13 provided at the inlet 8a of the pump 8. These brackets 15 are usually removed so as not to hinder the work. Then, the bolts 14 of the circular flanges 12 and 13 that suspend and fix the pressure pump 8 to the screw conveyor 7 are removed. As a result, the pump 8 is hung on the screw conveyor 7 via the bracket 15. Therefore, the pump 8 does not fall, and the pump 8 (about 1 t) as shown in FIG.
It is not necessary to raise and lower the robot significantly. That is, the work of suspending the lifting pump 8 is reduced, and the working efficiency is improved.

Thereafter, the mounting angle of the pump 8 with respect to the screw conveyor 7 is changed by a desired deflection angle. At this time, the flanges 12 and 13 for connecting the screw conveyor 7 and the pressure pump 8 are circular, and the bolts 14 for fastening them are provided at every predetermined pitch P. By relatively rotating, the deflection angle of the pressure feed pump 8 with respect to the screw conveyor 7 can be finely varied in units of the pitch P of the bolt 14. That is, the deflection angle of the pump 8 can be adjusted to an arbitrary angle. Further, it is not necessary to prepare a large number of torsional companion flanges corresponding to the shape of the curve as in the conventional example shown in FIG. 5, so that the economy is improved and the cost is reduced.

FIG. 2 shows a modified embodiment. As shown in the figure, in this modification, the bracket 15 having a U-shaped cross section is fixed by welding to the flange 12 on the screw conveyor 7 side, and a rolling roller 17 is provided on the inner bottom surface 15a of the bracket 15. According to this configuration, when the bolt 14 is removed, the flange 13 on the side of the pressure pump 8 becomes the bracket 1.
5 is supported on the roller 17
Since it rolls on the upper side, it can be deflected with a light force and the workability is improved.

FIG. 3 shows another modified embodiment. As shown in the figure, this modification is based on the inner bottom surface 15 of the bracket 15.
A telescopic jack 18 is provided at a, and a roller 17 is provided at the top of the jack 18. According to this configuration, if the telescopic jack 18 is contracted after the bolt 14 is removed, there is a gap between the circular flanges 12 and 13 so that the pressure pump 8
During the deflection, the flanges 12 and 13 do not rub against each other and can be deflected with a light force. After the deflection, the telescopic jack 1
By extending 8, it is possible to easily join the flanges 12 and 13 together.

FIG. 4 shows still another modified embodiment. As shown in FIG.
b is formed in a two-step shape, and the roller 1
7 is provided with a telescopic jack 18 at the lower stage 15d. When the two flanges 12 and 13 are fastened with bolts 14, the lower surface of the flange 13 on the side of the pump 8 and the roller 1
7, a slight gap is provided. According to this configuration, when the bolt 14 is removed, the flange 13 of the pump 8 is supported on the roller 17 of the bracket 15, and at this time, a small gap is left between the two flanges 12, 13. Thus, the pressure pump 8 can be deflected with a light force as in the previous embodiment. After the deflection, the telescopic jack 18 is extended so that the flanges 12, 1 can be easily formed.
Three comrades can be joined.

[0022]

As described above, according to the present invention, the following excellent effects can be exhibited.

(1) The mounting angle of the pressure feed pump to the screw conveyor can be freely adjusted in units of bolt pitch.

(2) The work efficiency is improved because the lifting work of the pumping pump is reduced.

(3) Since the conventional twisted companion flange is not required, the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a shield machine equipped with a soil and sand transport device according to one embodiment of the present invention, (a) is a side sectional view,
(b) is a sectional view of a circular flange portion.

FIG. 2 is a diagram showing a main part of a modified embodiment.

FIG. 3 is a diagram showing another modified embodiment.

FIG. 4 is a view showing still another modified embodiment.

FIG. 5 is a schematic view of a shield machine equipped with a conventional earth and sand transport device, (a) is a side sectional view, and (b) is a sectional view of a companion flange portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sediment transport apparatus 2 Shield machine 6 Cutter room 7 Screw conveyor 8 Pressure pump 12 Circular flange 13 Circular flange 14 Bolt 15 Bracket P Pitch

Continuation of the front page (56) References JP-A-63-156297 (JP, U) JP-A-4-57594 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9 / 12

Claims (1)

(57) [Claims] In a sediment transporting device for a shield machine, a pump for suspending and transporting earth and sand is further hung and connected to a screw conveyor for discharging earth and sand in a cutter chamber backward. In order to make the mounting angle freely at every predetermined pitch, a circular flange is provided at a connection portion between the screw conveyor and the pressure feed pump, and bolts for fastening these circular flanges are provided at a predetermined pitch along the circumferential direction of the circular flange. And a bracket having a U-shaped cross section for preventing the pressure pump from dropping when the bolts are removed so as to sandwich the circular flanges.