JP2003269084A - Shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine in which a cross section from a part for taking in excavated sediment to a part for discharging the excavated sediment is formed so as to be equal in capacity, in a cutter chamber of the shield machine, and which allows the excavated sediment taken into the cutter chamber to be discharged by a sediment discharging device without being consolidated in the cutter chamber. <P>SOLUTION: The rear side of a cutter spoke constituting a cutter head and a cutter driving part on the side of a shield body are coupled together by a supporting member which is formed by radially swelling the rear side of the cutter spokes which are radially provided on the backside of the cutter head. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a cutter head and a cutter driving section of a shield excavator.

[0002]

2. Description of the Related Art A rotary cutter head provided on the front surface of a shield excavator is pressed against an excavation face, and the rotary cutter head is rotationally driven to excavate the face face, which is excavated inside the shield excavator. The collected soil is taken in and it is carried to the ground by an earth discharging device. After that, the hydraulic jack for propelling the shield is reduced to newly place the segment on the inner wall surface of the tunnel formed between the shield part and the existing segment, and the backing material is placed in the gap between the ground and the segment. The tunnel is constructed by repeating the above steps of filling, extending the hydraulic jack for shield propulsion, pressing the cutter head again against the excavation face, and excavating the face.

As a method of supporting the cutter head and the cutter driving portion of the shield excavator, a center supporting method or an intermediate supporting method is generally used. However, the center support method has a limit in applicable diameter because a heavy cutter head is supported in a cantilever manner. Therefore, the large-diameter shield excavator generally adopts the intermediate support method, but this intermediate support method has a problem that the excavated earth and sand adhere to the intermediate beam.

In a large-diameter shield excavator, as a publicly known example of a supporting member for connecting a heavy cutter head and a cutter driving unit in addition to the above-mentioned system, Japanese Utility Model Laid-Open No. 63-145996 shown in FIG. 5 is disclosed. A supporting member for a shield type excavator shown in (1) is known. In this conventionally known shield type excavator, reference numeral 50 is a shield excavator main body, reference numeral 52 is a cutter bit attached to a cutter head 51, and reference numeral 54 is a bearing housing for attaching a bearing 53 to the shield excavator main body 50. Is.

Reference numeral 55 is a cutter drum rotatably supported by bearings 53, and reference numeral 57 is a connecting bolt for fixing the flange 56 to the cutter drum 55.
A flange 56 is attached to the rear portion of the hollow polygonal pyramidal shaft 58, and the flange 56 is attached to the cutter drum 55 via a connecting bolt 57. Also, reference numeral 59
Is a shield jack provided in the shield excavator main body 50, reference numeral 60 is a cutter chamber behind the cutter head 51, and reference numeral 61 is a cutter chamber 60.
With a screw conveyor for discharging the sediment inside,
Reference numeral 62 is a segment, and reference numeral 63 is a rotary drive source for rotationally driving the cutter head 51 via the hollow pyramidal shaft 58.

The shield excavator has a segment 62 assembled behind the shield excavator body 50.
And the shield jack 59, the shield excavator body 5
It is propelled forward 0. At this time, the hollow polygonal pyramidal shaft 58 and the cutter head 51 make the shield excavator body 5
The earth and sand in front of the shield excavator main body 50 are excavated by the cutter bit 52 attached to the cutter head 51 by rotating around the axis of 0. This excavated earth and sand is moved forward by the shield excavator main body 50, so that the cutter chamber 6
The trapped portion of the hollow polygonal pyramidal shaft 58 pushes the loaded earth and sand into the cutter chamber 60 toward the outer peripheral portion.

At this time, each apex of the hollow polygonal pyramidal shaft 58 forcibly moves and agitates the earth and sand that is pushed in the cutter chamber 60 toward the outer peripheral portion, and the plastic flow of the earth and sand in the cutter chamber 60. Intensification is further promoted. In addition, due to the cone shape of the hollow polygonal pyramidal shaft 58 in the lower part of the outer circumference of the cutter chamber 60, a pressure is generated to push the sand from the lower part of the inner circumference of the cutter chamber 60 into the intake port of the screw conveyor 61 for discharging sand, It is said that the agitated earth and sand is pushed into the earth and sand discharging screw conveyor 61 and discharged to the rear of the shield excavator main body 50 to improve the earth discharging efficiency.

[0008]

However, the support member of the heretofore known shield type excavator has a polygonal pyramid shape and takes in the earth and sand excavated from the front surface of the cutter head into the cutter chamber. At that time, since the support member is in the shape of a polygonal pyramid, the cutter chamber becomes narrower as it goes deeper to the bottom of the polygonal pyramid, and the taken in sand becomes the cutter as it is sent deeper into the cutter chamber. The chamber gradually becomes compacted and becomes clogged.

The earth and sand taken into the cutter chamber is carried out to the rear of the shield type excavator by an earth and sand discharging device such as a screw conveyor for discharging earth and sand provided in the cutter chamber, but is compacted in the cutter chamber. It becomes impossible to carry out the earth and sand to be carried out by the earth and sand discharge screw conveyor. In order to carry out the compacted earth and sand, it is necessary to stop the excavation work once and crush the compacted earth and sand by the worker, and then restart the excavation work. Not desirable.

Further, in the center support system in which the cutter head is cantilevered, when excavated by the cutter head of the shield excavator and taken into the cutter chamber,
The cross-sectional area of the inside of the cutter chamber in the longitudinal direction is the same in the intake and discharge parts of the excavated earth and sand, and the earth and sand taken into the cutter chamber is not consolidated inside and the earth and sand is discharged from the screw conveyor etc. Although it is discharged by the earthmoving device, on the other hand, since the heavy cutter head is cantilevered as described above, it is difficult to make the cutter head of the shield excavator a large diameter, and the diameter of the tunnel to be excavated is limited. was there.

Therefore, the present invention has been made in view of the above-mentioned problems, and the excavated earth and sand excavated by the cutter section on the front surface of the shield excavator and taken into the cutter chamber are
Allows smooth removal of soil with a device for soil removal without being compacted in the cutter chamber, and the support members for the cutter head and cutter drive unit can support the weight of large diameter cutter heads. The purpose of the present invention is to provide a shield excavator.

[0012]

In order to achieve the above object, the invention according to claim 1 of the present invention is a shield excavator for excavating a face, which comprises a cutter head and a cutter drive unit on the shield body side. A support member provided from the center of the back surface of the cutter head to the rear, and a bulging portion provided in the radial direction of the support member and extending from the rear end of the cutter spoke to the rear. is there. In order to achieve the above object, the invention according to claim 2 of the present invention is characterized in that the support member and the bulging portion are hollow.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
4 will be described. 1 is a vertical sectional side view of the shield excavator of the present invention, FIG. 2 is a front view of the shield excavator of the present invention, and FIG. 3 is a perspective view of the shield excavator of the present invention.
FIG. 3 is a perspective view of a cutter head portion of the shield excavator of the present invention.

Reference numeral 1 is a shield excavator, which is composed of a front cutter head portion 2 and a shield excavator main body 3 connected to the rear thereof, and the cutter head portion 2 comprises a plurality of cutter head face plates 4 and a plurality of cutter head face plates 4. A slit portion 18 is formed on the cutter portion and both sides thereof for taking in the earth and sand excavated by the cutter portion into the cutter chamber 6 inside the shield. The cutter unit is provided with a large number of cutter bits 19
It is composed of cutter spokes 5 having.

Further, a cutter support member 7 for supporting and rotating the cutter head portion 2 is provided from the center of the back surface of the cutter head face plate 4 toward the rear. The plurality of cutter spokes 5 provided on the cutter head face plate 4 are provided with bulging portions 20 which serve as a reinforcing member for supporting the load of the cutter head portion 2. The bulging portion 20 has a predetermined length in the radial direction from the cutter support member 7 provided in the center of the cutter spoke 5, and extends rearward with substantially this length to extend in the radial direction of the cutter spoke 5. Is formed in. The rear end of each bulge 20 and the rear end of the cutter support member 7 are fixed to a circular rotary partition wall 9.

The bulging portion 20 of the cutter spoke 5
May be the entire length of the cutter spoke 5 in the radial direction, or may be half the length of the cutter spoke 5 in the radial direction as long as it has the strength to support the load of the cutter head 2. good. Further, the cutter spokes 5 and the bulging portions 20 may be solid bodies or hollow bodies. In addition, when the bulging portion 20 is formed of a hollow body, the cutter spoke 5 is formed with a hole through which a rod for trial excavation for investigating the underground condition of the front surface for excavation is formed. A rod for trial digging may be rotatably provided in the hole.

The cutter chamber 6 includes a cutter head face plate 4, an annular side surface of the shield excavator body 3, a circular rotary partition wall 9 provided at the rear end of the cutter support member 7, and a front inner circumference of the shield excavator body 3. A partition formed by a disk-shaped partition 22 provided on the surface and a partition, and has a cylindrical shape. The inside of the cutter chamber 6 has a space in which a worker can work to check the excavation state and the cutter head face plate 4.

The shield excavator main body 3 supplies water or a chemical solution for increasing the fluidity of the rotary drive source 11 for rotationally driving the cutter head portion 2, the self-sustaining face face and the excavated earth and sand taken into the cutter chamber 6. A water pipe 13, a drainage pipe 14 for discharging excavated sediment mixed with water or a chemical solution in the cutter chamber 6, and an erector device 1 in which a segment 16 is arranged on the inner wall surface of a tunnel formed by excavation.
5, segment 1 assembled by erector device 15
A shield jack 12 for advancing the shield excavator 1 by taking a reaction force is provided.

Below the cutter chamber 6,
It has a stirring device 17 for stirring the excavated earth and sand taken into the cutter chamber 6. The cutter drive unit 10 which is rotationally driven by the rotary drive source 11 attached to the partition wall 22 engages with the rotary partition wall outer peripheral portion 21 of the rotary partition wall 9 to rotate the cutter head unit 2.

Next, the operation of the shield excavator of the present invention having the above structure will be described. The shield excavator 1 is constructed by extending the shield jack 12 using the existing segment 16 lined on the inner peripheral surface of the excavated tunnel as a reaction base.
Press the cutter head part 2 against the face of the tunnel. At this time, the rotary partition outer peripheral portion 21 of the rotary partition 9 of the cutter head section 2 is engaged with the cutter drive section 10 which is rotationally driven by the rotary drive source 11, and is rotationally driven, so that the cutter head section 2 is rotationally driven. A large number of cutter bits 19 provided in the cutter head portion 24 excavate the face of the tunnel.

The earth and sand excavated by a large number of cutter bits 19 are taken into the cutter chamber 6 inside the shield through slits 18 formed on both sides of each cutter spoke 5. Since the bulging portion 20 extends rearward in the radial direction, the excavated earth and sand taken into the cutter chamber can be smoothly discharged from the mud pipe 14 without being compacted in the cutter chamber.

Further, in the embodiment of the present invention, the cutter head 2 and the cutter are supported by the cutter supporting member 7 and the bulging portion 20 provided in the radial direction of the cutter supporting member 7 and extending from the rear of the cutter spoke 5. Since the cutter supporting member 7 of the drive unit 10 is connected, the bulging portion 20 serves as a reinforcing member for the cutter supporting member 7 and can support the load of the cutter head unit 2 in a shield excavator having a large diameter. In addition, by forming the cutter spokes 5 and the bulging portions 20 that are bulged with a hollow body, a worker can enter and leave when the cutter spokes 5 are provided with test drilling rods and when the cutter bits are replaced.

[0023]

As described above, according to the shield excavator of the present invention, the cutter head and the cutter drive unit on the shield body side are provided from the center of the rear surface of the cutter head to the rear, and the supporting member. Since it is provided in the radial direction of the member and is connected with the bulging portion extending from the rear end of the cutter spoke to the rear, the bulging portion serves as a reinforcing member for the cutter supporting member, and the load of the cutter head portion together with the cutter supporting member. Has the effect of being able to support

Since the cutter chamber has the same sectional shape from the intake portion to the discharge portion of the excavated earth and sand, it has the same capacity, and the excavated earth and sand taken into the cutter chamber is not compacted in the cutter chamber. The soil can be discharged smoothly, and the excavation work of excavated earth and sand can be improved. Further, by making the support member and the bulging portion hollow, there is an effect that a worker can go in and out when the cutter spoke is provided with a rod for trial digging or when the cutter bit is replaced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a shield excavator of the present invention,

FIG. 2 is a front view of the shield excavator of the present invention,

FIG. 3 is a perspective view of the shield excavator of the present invention,

FIG. 4 is a perspective view of a cutter head portion of the shield excavator of the present invention,

FIG. 5 is a vertical sectional side view of a conventionally known shield excavator.

[Explanation of symbols]

1 shield excavator, 2 cutter head part, 3
Shield excavator body, 4 cutter head face plate, 5
Cutter spokes, 6 cutter chambers, 7 cutter support members, 9 rotary partition walls, 10 cutter drive parts, 11 rotary drive sources, 12 shield jacks,
13 water supply pipes, 14 drainage pipes, 15 erector devices, 16 segments, 17 stirring devices, 18 slit parts, 19 cutter bits, 20 bulging parts,
21 rotary partition outer periphery, 22 partition,

Claims (2)

[Claims] 1. A shield excavator for excavating a face,
A support member provided with the cutter head and the cutter drive unit on the shield body side from the center of the back surface of the cutter head to the rear, and a bulge provided in the radial direction of the support member and extending from the rear end of the cutter spoke to the rear. A shield excavator characterized by being connected with a part. 2. The shield excavator according to claim 1, wherein the support member and the bulging portion are hollow.