JPH05106390A - Bent system for shield machine - Google Patents

Abstract

PURPOSE:To minimize the excess excavation quantity by longitudinally dividing a shield main body into multiple portions, bendably connecting them, and setting the length of a front barrel at the front from the bending center and the length of a rear barrel at the rear from the same equal. CONSTITUTION:A shield main body 1 is divided into two: a front barrel 1A and a rear barrel 1B, and they are connected bendably in the right and left directions centering on a bending pin 4. The length L3 of the front barrel 1A (from the pin 4 to the front face of a cutter head 5) and the length L2+L1 of the rear barrel 1B {(from the pin 4 to the front end face of a segment 6)+(from the front end face of the segment 6 to the rear end of the rear barrel 1B)} are set equal. Skin plates 1a, 1b to the front barrel 1A and the rear barrel 1B are inscribed on the wall face inner periphery R1 of a tunnel 11 respectively, the outside of the head 5 and the rear end outside of the rear barrel 1B have the same locus as that of the wall face outer periphery R0, and the excess excavation quantity DELTA is minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-barreled shield excavator center bending mechanism in which a shield body is divided and flexibly connected for curved construction.

[0002]

2. Description of the Related Art When performing a curved construction with a single-shield shield machine, as shown in FIG.
Excessive duplication corresponding to ₁ + M ₂ is performed by the copy cutter provided on the cutter head 22. However, there are cases in which the amount of excess dug taken in is insufficient, or the excess dug portion collapses due to the nature of the soil, and the required amount of excess dug δ cannot be secured.

It is necessary to reduce the amount of excess digging δ,
A double-barreled shield excavator in which a shield body is divided and flexibly connected is proposed. For example, a center-breaking shield machine which is divided into a front body 31 and a rear body 32 is shown in FIG.
As shown in FIG. _3, a front body 31 having a length N ₃ (from the bending center O to the front of the cutter head) having a cutter head 33, a cutter head driving device, a soil discharging device, etc., and a front body 31 and a rear body 32 are connected. The length N ₂ + N ₁ (from the bending center O to the segment 34 including the center folding mechanism 30 and the segment assembling device).
Rear face 3 from the end face of + the end face of the segment 34 to the rear end of the rear body
The bending angle θ is determined so that the front body 31 and the rear body 32 are inscribed on the inner peripheral surface of the tunnel with reference to the end surface of the segment 34.

[0004]

Generally, N ₁ , N ₂ and N ₃ are determined by the bending mechanism and the storage size of the bending jack.
However, in the case of N ₃ > N ₁ + N ₂ shown in FIG. 6, the outer trace excavated by the cutter head is not in contact with the outer rear end of the rear body (tail portion), and thus a gap d is generated, which results in a tail ditch. Since the distance between the section and the wall surface of the tunnel becomes wider, the injection amount of the backfill material increases. Fixing of the segment becomes difficult. Backfill material flows back into the shield body. There was a problem such as.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a center bending mechanism for a shield machine which can minimize the amount of excess digging and enable sharp curve construction.

[0006]

In order to solve the above-mentioned problems, the first means of the present invention is a middle folding mechanism of a shield machine in which a shield body is divided into a plurality of parts in the front-rear direction and is flexibly connected. The length of the front torso in front of the center of bending and the length of the rear torso in the rear are set to be equal.

The second means is a center folding mechanism of the shield machine in which the shield body is divided into a plurality of parts in the front and rear direction and flexibly connected to each other. The lengths of the cylinders are set to be equal, a spherical portion is provided on the outer circumference of the bent portion of the rear body, and a spherical receiving portion slidably fitted on the spherical portion is provided on the front body. Is a reduced diameter.

[0008]

According to the above-mentioned first means, the bending center position is located at the center of the entire length of the shield machine, so that the skin plates inside the bending of the front body and the rear body are inscribed on the inner circumferential side of the tunnel wall surface, respectively. In addition, by moving the outside of the front end of the front body and the outside of the rear end of the rear body along the outer circumference of the tunnel wall surface, the amount of excess digging, that is, the distance between the inside of the front end of the front trunk and the inner circumference of the tunnel wall is theoretically the minimum. Can be

According to the second means, when the bending center position is the center of the entire length of the shield machine and the amount of excess digging is minimized, the front body rear part at the cross-section position including the bending center is also the same as the tunnel wall outer peripheral side. As it moves on the locus, the rear portion of the spherical receiving portion, which extends rearward from the cross section including the bending center, protrudes outward from the outer circumferential side of the tunnel wall surface and scrapes the ground. Therefore, the reduced diameter portion eliminates the portion projecting to the outer peripheral side of the tunnel wall surface, eliminates the influence on the direction control of the shield machine, and can reliably perform the sharp curve construction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 2, reference numeral 1 denotes a shield main body, which is divided into a front body 1A and a rear body 1B and is divided into two parts by a plurality of bending jacks 2 connected between the front body 1A and the rear body 1B at predetermined circumferential intervals. Is connected so as to be bendable in the left-right direction about a vertical bending pin 4 provided via brackets 3A and 3B. A cutter head 5 is rotatably supported on the front portion of the front body 1A, and a rotary drive device for the cutter head 5 and a soil discharging device are provided, which are not shown. The rear body 1B is provided with segment assembly devices 7 for assembling the segments 6 and propulsion jacks 8 for propelling the shield body 1 by using the assembled segments 6 as reaction force receivers at regular intervals in the circumferential direction. A spherical portion 9 centered on the bending pin 4 is formed over the entire circumference at the front end of the rear body 1B, while a spherical receiving portion slidably fitted on the spherical portion 9 at the rear end of the front body 1A. 10 are provided.

Further, in this shield machine, as shown in FIG. 1, the length L ₃ of the front body 1A (from the bending pin 4 to the front surface of the cutter head 5) and the length L ₂ + L _{1 of the} rear body 1B ( The length from the bending pin 4 to the front end face of the segment 6 + the front end face of the segment 6 to the rear end of the rear body 1B) is set to be equal. Therefore, by setting the bending pin 4, that is, the bending center position at the center of the entire length of the shield machine, the front body 1A and the rear body 1
The skin plates 1a and 1b on the inner side of the bend of B are the tunnel 1
The outer circumference of the cutter head 5 and the outer circumference of the rear end of the rear body 1B are in the same loci as the outer circumference Ro of the tunnel 11 wall, respectively, and the amount of excess excavation Δ, that is, the inner circumference Ri of the tunnel 11 wall Ri. It can be configured such that the distance between the and the inside of the cutter head 5 is theoretically the minimum.

Further, as indicated by a phantom line in FIG. 1, under the above setting conditions, the rear part of the front body 1A at the cross-section position including the bending center also moves on the same locus as the outer circumference Ro of the tunnel 11 wall surface. In the spherical surface receiving portion 10 shown in FIG. 3, the ground is cut at the portion A extending rearward from the cross section including the bending center. For example, when performing a curved construction with a radius of 40 m on a shield machine with a diameter of about 11 m, if A is 300 mm, the protrusion amount D is about 46 mm, which affects the direction control of the shield machine. It will also affect sharp curve construction. Therefore, in this shield machine, in order to eliminate the influence of the protrusion amount D, the spherical surface receiving portion 10
The outer peripheral surface is formed with a tapered surface 12 having a smaller diameter toward the rear part.

As shown in FIG. 4, a step portion 13 is provided on the outer peripheral surface of the spherical surface receiving portion 10 instead of the tapered surface 12, and a portion A of the spherical surface receiving portion 10 extends rearward from a cross section including the bending center. May be reduced in diameter.

[0014]

As described above, according to the first means of the present invention, the bending center position is located at the center of the entire length of the shield machine, so that the skin plates inside the bending of the front body and the rear body are formed on the tunnel wall surface. Inscribed on the inner circumference side respectively, and the outer side of the front end of the front body and the outer side of the rear end of the rear body are moved along the outer peripheral surface of the tunnel wall. The distance on the inner circumference side can be theoretically minimized.

According to the second means, when the bending center position is the center of the entire length of the shield machine and the amount of excess digging is minimized, the front body rear part at the cross-section position including the bending center is also the same as the outer peripheral side of the tunnel wall surface. As it moves on the locus, the rear portion of the spherical receiving portion, which extends rearward from the cross section including the bending center, protrudes outward from the outer circumferential side of the tunnel wall surface and scrapes the ground. Therefore, the reduced diameter portion eliminates the portion projecting to the outer peripheral side of the tunnel wall surface, eliminates the influence on the direction control of the shield machine, and can reliably perform the sharp curve construction.

[Brief description of drawings]

FIG. 1 is a plan view showing a curved construction of an embodiment of a shield machine according to the present invention.

FIG. 2 is a plan sectional view of the shield machine.

FIG. 3 is an enlarged sectional view of a spherical portion of the shield machine.

FIG. 4 is an enlarged sectional view showing another embodiment of the spherical surface receiving portion.

FIG. 5 is an explanatory view showing a curved construction of a conventional single-barrel shield machine.

FIG. 6 is an explanatory view showing a curved construction of a conventional double-body shield machine.

[Explanation of symbols]

 1 Shield main body 1A Front body 1B Rear body 2 Bending jack 4 Bending pin 5 Cutter head 6 Segment 8 Propulsion jack 9 Spherical part 10 Spherical receiving part 12 Tapered part 13 Step part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000183325 Sumitomo Construction Co., Ltd. 13-13 Arakicho, Shinjuku-ku, Tokyo (71) Applicant 000148346 Zentakagumi Co., Ltd. 2-2-11 Nishi-machi, Nishi-ku, Osaka-shi, Osaka ( 71) Applicant 000207780 Otoyo Construction Co., Ltd. 1-24-4 Shinkawa, Chuo-ku, Tokyo (71) Applicant 000219406 Toa Construction Industry Co., Ltd. 5 Yonbancho, Chiyoda-ku, Tokyo (71) Applicant 000195971 Nishimatsu Construction Co., Ltd. Tokyo 1-20-10 Toranomon, Minato-ku, Tokyo (71) Applicant 000005119 Hitachi Zosen Co., Ltd. 5-3-8 Nishikujo, Konohana-ku, Osaka-shi, Osaka (72) Kenji Asada 5 Nishikujo, Nishi-ku, Osaka, Osaka 3-28, Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. A center bending mechanism for a shield machine, wherein a shield body is divided into a plurality of parts in the front and rear direction and flexibly connected to each other, wherein a front front body and a rear rear body are equal in length from a bending center. The center-breaking mechanism of the shield machine, which is characterized by being set. 2. A center bending mechanism for a shield machine in which a shield body is divided into a plurality of parts in the front and rear direction and flexibly connected to each other, wherein a length of a front body in front of a bending center and a length of a rear body in the rear are equal. A spherical surface portion is provided on the outer circumference of the bent portion of the rear body, and a spherical surface receiving portion slidably fitted on the spherical surface portion is provided on the front body, and the rear side of the spherical surface receiving portion is reduced in diameter. A mechanism for folding the shield machine.