JPH10292782A - Rectangular shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bury a tunnel having a rectangular cross section efficiently into a ground accurately by a pipe jacking method. SOLUTION: Excavating tools 3 having shafts in upper and lower sections in the cross direction of a rectangular shield machine 1 body are disposed in front of the shield machine 1 body so as to be reversely turned respectively. A screw conveyor 8 arranged so as to be juxtaposed to the excavating tools 3 is supported rotatably to the rectangular shield machine 1 body at the rear of the excavating tools 3. A rectangular pipe-culvert 2 is buried while excavating and carrying out a face bedrock without deflecting the rectangular shield machine 1 by reversely rotating the upper and lower excavating tools 3 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular shield machine for constructing a tunnel having a rectangular cross section underground.

[0002]

2. Description of the Related Art In recent years, a propulsion method and a shield method which do not hinder traffic of vehicles and the like and do not adversely affect underground buried objects and the like have been widely used in an urban area. The cross section of the tunnel used for the propulsion method and the shield method is
The earth pressure of the surrounding ground is reduced by the arch action, and pipes and segments having a circular cross-sectional shape that are effective in terms of strength are often used. However, recently, there have been many plans for a rectangular section in which the excavated section can be made smaller than the circular section, and shield excavators for the rectangular section have been proposed and put into practical use. As a configuration of the rectangular shield machine, a rotary cutter is provided in the front part of the rectangular shield machine in the width direction thereof, and a drum cutter having substantially the same size as the opening of the front surface of the rectangular shield is provided.
There has been developed an excavator having a mechanism for excavating a cutting face mountain by rotating a drum cutter and carrying out excavated soil rearward by a screw conveyor or the like arranged behind the excavation ground.

[0003]

With the development of the above-mentioned rectangular shield excavator, excavation of a size equivalent to a rectangular cross section is performed by rotation of the drum cutter, and excavated soil taken into the rectangular shield excavator is formed by the drum cutter. It is collected at the center or both sides by screw conveyors arranged side by side at the rear, and is conveyed rearward by an earth removal conveyor connected continuously in the pipe axis direction to construct a tunnel with a rectangular cross section. However, the rectangular shield machine described above has the following disadvantages. The drum cutter provided at the front of the rectangular shield machine excavates the face face mountain by rotating, but since the rotation of the drum cutter is continuous to one of the two, The rectangular shield machine becomes easier to deflect, the accuracy of the tunnel to be constructed deteriorates, and the correction of the deflection of the rectangular shield machine is done by frequently reversing the rotation of the drum cutter, There was a problem that the efficiency of the propulsion work deteriorated.

Accordingly, the present invention provides a rectangular shield machine capable of efficiently constructing a tunnel without deflection of the rectangular shield machine.

[0005]

That is, according to the present invention, an excavator having a rotary shaft in the width direction thereof is disposed at the front of a rectangular shield excavator main body so as to reversely rotate up and down, respectively. Behind the screw excavator, a screw conveyor arranged in parallel with the excavator is rotatably supported on the main body of the rectangular shield excavator, and the upper and lower excavators are rotated in reverse to deflect the rectangular shield excavator. This is a rectangular shield excavator that lays a rectangular conduit while excavating and unloading the face of the face.

The outer shell of the main body of the rectangular shield machine is formed of a relatively strong steel plate, and excavating tools having a rotation axis in the width direction are arranged vertically on substantially the entire surface of the front opening. It is arranged rotatably. Each of the excavating tools installed on the upper and lower sides may be an integrated excavating tool continuous over the entire width in the width direction, or may be an excavating tool divided into two right and left parts in the width direction. As the shape of the drilling tool, a drum-shaped one provided with a plurality of cutting bits or a plurality of screw-shaped rib plates having a cutting bit attached to the tip thereof is used. The drilling tool is installed such that the upper drilling tool and the lower drilling tool are rotated in reverse.

A screw conveyor having a commonly used mechanism is employed as a screw conveyor arranged in parallel behind the excavator, and excavated soil excavated by the excavator and taken into the rectangular shield excavator is shielded. Install it in the center or on both sides of the aircraft. Excavated soil collected at the center or both sides of the shield machine is conveyed rearward by a discharging conveyor or the like which is sequentially provided in the pipe axis direction.

According to the basic configuration of the present invention, when the upper and lower excavating tools are rotated, an effect of excavating a tunnel having a rectangular cross section and taking excavated soil into the shield machine can be obtained. When forming the tunnel, the shield excavator has a mechanism in which the upper excavator and the lower excavator rotate in reverse, so that the force for deflecting the shield excavator is canceled out, and a stable tunnel construction can be performed. Along with the excavation of the tunnel, the shield machine is advanced by the propulsion of the propulsion equipment, and a rectangular culvert is buried in the tunnel sequentially.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view illustrating a rectangular shield machine according to the present invention. The outer shell 4 of the main body of the rectangular shield machine 1 is formed of a relatively strong steel material into a rectangular shape. Drum-shaped excavators 3 and 4 are arranged in the upper and lower stages of the opening at the tip of the outer shell 4. These excavators 3, 4
It has rotating shafts 6 and 7 in the width direction, and is rotatably supported by the main body of the rectangular shield machine 1. A plurality of cutting bits 5 are provided on the surface of each of the drilling tools 3 and 4. Behind the excavators 3, 4, a screw conveyor 8 arranged to be juxtaposed to the excavators 3, 4 is rotatably supported by a rotary shaft 9 on the main body of the rectangular shield machine 1. A rectangular conduit 2 is connected to the rear end of the rectangular shield machine 1.
In the present embodiment, the installation of the screw conveyor 8 is exemplified in one stage, but it is also possible to arrange the screw conveyor 8 in two stages depending on the shape of the rectangular cross section.

FIG. 2 is a plan view for explaining a method of driving the screw conveyor of the rectangular shield machine. A pair of digging tools 3 are mounted on the left and right sides of the tip of the rectangular shield machine 1. A screw conveyor 8 is attached to the rear of the drilling tool 3 in parallel with the drilling tool 3. At the center of the rectangular shield machine 1, the rotating shaft 15 of the discharging conveyor 12 sequentially connected from the back of the shaft is connected to the shield machine 1.
, And a center cutter 10 is attached to the tip. The rotation shaft 15 behind the center cutter 10 is provided with a rotation transmission mechanism 11 using gears or the like, and serves as a mechanism for transmitting the rotation of the earth discharging conveyor 12 to each screw conveyor 8.

The discharging conveyor 12 extended to the shaft side
Is approximately the same as the length of the rectangular sewer 2
The efficiency of propulsion construction can be improved. In the present embodiment, the method of arranging the discharging conveyor 12 at the center is exemplified. However, it is also possible to adopt a method of arranging the discharging conveyor 12 on both sides of the rectangular pipe 2. In this case, the screw conveyor 8 is installed such that the excavated soil is transported to both sides.

FIG. 3 is a sectional view for explaining a method of driving the excavator 3. As for the method of transmitting the rotation of the excavating tools 3 and 4 arranged vertically, the upper excavating tool 3 transmits the rotation by connecting the sprocket 16 of the driving machine 13 and the sprocket 18 of the upper excavating tool 3 with the chain 14 installed at the rear. I do. The lower excavator 4 is connected to a lower sprocket 17 rotatably installed by meshing with a sprocket 16 of a drive unit 13 and a sprocket 19 of the lower excavator 4 via a chain 14 to transmit rotation. The excavators 3 and 4 are rotated in opposite directions by the above mechanism. In the present embodiment, the rotation transmission is exemplified by the chain transmission, but other technologies such as gears can also be used.

FIG. 4 is a front view for explaining the front surface of the rectangular shield machine according to the present invention. The outer shell 2 of the rectangular shield machine 1 is made of a relatively strong steel material or the like.
In the opening at the tip, a pair of excavating tools 3 and 4 are provided at the upper part and the lower part. Each of the excavators 3 and 4 has a rotating shaft 6 in the width direction,
7 and is supported by the main body of the rectangular shield machine 1. The drilling tools 3 and 4 have a plurality of cutting bits 5 in a drum shape. Alternatively, a screw-shaped rib plate having a cutting bit attached to the tip thereof can be used.

Next, the state of propulsion of the rectangular shield machine 1 according to the above-described embodiment will be described. The excavators 3 and 4 at the tip of the rectangular shield machine 1 are rotated, and the rectangular shield machine is excavated while excavating the face mountain. Excavated soil is taken into the machine 1, and a tunnel having a rectangular cross section is formed. The excavated soil taken into the rectangular shield machine 1 is driven to rotate the rotating shaft 15 of the earth discharging conveyor 12, so that the screw conveyor 8 is also driven to rotate and convey the excavated soil to the central portion. The excavated soil conveyed to the center is conveyed backward by the earth discharging conveyor 12.

[0015]

The rectangular shield machine according to the present invention has a mechanism in which the upper excavator and the lower excavator rotate in reverse, so that the deflection force due to the rotation during excavation is offset by the upper and lower excavators, The rectangular shield excavator can perform stable excavation. In addition, when the rectangular shield machine is deflected vertically, only the upper or lower excavator is rotationally driven, and when deflected left or right, only the right or left excavator is rotationally driven, so that the direction can be easily changed. You can make corrections.

[0016]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a rectangular shield machine according to the present invention.

FIG. 2 is a plan view illustrating a method of driving a screw conveyor of the rectangular shield machine.

FIG. 3 is a cross-sectional view illustrating a method of driving a drilling tool of the rectangular shield machine.

FIG. 4 is a front view illustrating a rectangular shield excavation front surface of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rectangular shield machine 2 rectangular conduit 3 upper drilling tool 4 lower drilling tool 5 cutting bit 6 upper drilling tool rotation axis 7 lower drilling tool rotation axis 8 screw conveyor 9 screw conveyor rotation axis 10 center cutter 11 rotation transmission mechanism 12 Conveyor 13 Drive 14 Chain 15 Discharge conveyor rotating shaft 16 Drive sprocket 17 Lower sprocket 18 Upper excavator sprocket 19 Lower excavator sprocket

Claims (1)

[Claims] An excavator having a rotation axis in the width direction thereof is disposed at a front portion of a rectangular shield excavator main body so as to reversely rotate up and down, and is provided in parallel with the excavator behind the excavator. The screw conveyor arranged so as to be rotatable is rotatably supported on the main body of the rectangular shield machine, and the upper and lower excavators are rotated in reverse to excavate and unload the face ground without deflecting the rectangular shield machine. A rectangular shield excavator characterized by burying a rectangular sewer while performing.