JP2003064982A - Shield machine starting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine starting method which can correctly start a shield machine in a predetermined direction under conditions where the shield machine is divided into a plurality of trunk portions and they are sequentially input in a shaft to be started. SOLUTION: When the shield machine is divided into a front trunk portion, an intermediate trunk portion, and a rear trunk portion, and the trunk portions are sequentially input in the shaft to be assembled and started, propelling jacks 3 are set such that bottoms 3a thereof are set on the side of the front trunk 11 or a divided shield 14. Then, a reaction wall 42 is pressed directly or via a strut 5 by rods 3b of the propelling jacks 3, to thereby propel the front trunk portion 11 or the divided shield 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides a shield machine into a plurality of body parts such as a front body, a middle body, and a rear body, and sequentially inserts the body parts into a shaft to assemble them. The present invention relates to a method for starting a shield machine to be started.

[0002]

2. Description of the Related Art Conventionally, in the shield construction method,
After forming a starting shaft in advance, after providing a reaction wall in the wall portion on the side opposite to the starting hole in this shaft, throw a shield machine into the shaft, and it is provided on the front side of the starting shaft. It is placed in a predetermined position on the starting cradle. Next, a temporary segment is assembled between the reaction wall and the shield machine, the shield jack attached to the rear trunk of the shield machine is extended, and the assembled temporary segment is pushed to take the reaction force. While promoting the shield machine. After that, each time the shield jack is stroked, the shield jack is contracted to add a temporary segment. Repeating this work, when the shield machine comes out of the starting hole, while assembling this segment, the shield machine is propelled by the same method as above, and friction force between this segment and the ground is required. After the thrust is exceeded, the temporary segment in the shaft is removed.

[0003] By the way, when the shield machine cannot be installed integrally as in the case of tunnel construction in urban areas and the like, the shield machine cannot be installed integrally, for example, in the front body part, There is a method in which the body is divided into three body parts, that is, a middle body part and a rear body part, and the respective body parts are sequentially loaded into a vertical shaft and then assembled and started. Normally, shield jacks are not attached to the divided front body portion and middle body portion, and therefore, a starting method such as a conventional propulsion method is adopted when starting. 9 (a) and 9 (b) are views showing a conventional split start method. First, as shown in FIG. 9 (a), the front trunk portion 11 is put into the vertical shaft 40, and The propulsion jack 43 is fixed to the reaction force wall 42 provided on the opposite side of the starting hole 41, and the propulsion jack 43 is
Is extended and the rear end portion of the front body portion 11 is pushed, so that the front body portion 11 is pushed out while taking the reaction force from the reaction force wall 42. Then, for each stroke of the propulsion jack 43,
The propulsion jack 43 is contracted, and on the starting frame 44,
After inserting the strut 45, which is a spacer member, between the front body portion 11 and the propulsion jack 43, the propulsion jack 43 is extended again and the strut 45 is pushed to move the front body portion 11 along the starting frame 44. To move. By repeating this operation, the front body portion 11 is propelled to a distance that can secure a space required for installing and assembling the middle body portion. Next, the middle body 12 is put into the vertical shaft 40 and the front body 11 is inserted.
After connecting with the front body 1
Similarly to the case of 1, the strut 45 is sequentially inserted by the propulsion jack 43 while the rear portion of the middle body portion 12 (hereinafter, referred to as the split shield 14) connected to the front body portion 11 is extruded, and the splitting is performed. Promote the shield 14. After that, the rear trunk portion is thrown in and connected to the middle trunk portion 12 to assemble the shield machine. The assembled shield machine is started in the same manner as the integrated shield machine. Further, when the split shield 14 is propelled, the main cutter 21 provided on the front surface of the front body portion 11 is driven to perform digging (temporary digging), and struts 45 are sequentially added to propel the split shield 14. Intrude into the ground.

[0004]

By the way, in the above-described integrated shield machine and split shield 14, the main cutter 21 moves forward while excavating the ground even at the time of starting. Therefore, depending on the ground to be excavated, The tip may nose down. At this time, in the integrated shield machine, it is possible to control the attitude of the shield machine by pushing only the lower shield jack. However, in the split shield 14 to which the shield jack is not attached, as described above,
Since the reaction force from the reaction force wall 42 due to the extension of the propulsion jack 43 is transmitted to the split shield 14 via the strut 45 fixed on the starting base 44, the strut 45 only in the lower half portion is used to operate the strut. Even if 45 is pressed, no eccentric moment acts on the split shield 14. Therefore, there is a problem that the attitude of the tip of the shield cannot be controlled and it is difficult to accurately start the shield machine in a predetermined direction.

The present invention has been made in view of the problems of the prior art, and when the shield machine is divided into a plurality of trunks and each of the trunks is sequentially inserted into a shaft and started, the shield machine is started. It is an object of the present invention to provide a starting method capable of accurately starting the vehicle in a predetermined direction.

[0006]

According to a first aspect of the present invention, there is provided a method of starting a shield machine, comprising: a shield machine, a shield front body portion having a main cutter on a front surface thereof; When segmented into a plurality of body parts including a rear body part having a shield jack for advancing the shield machine by pushing the assembled segment, and when starting while assembling by sequentially inserting each of the body parts into a vertical shaft, An expansion device is provided, one end of which contacts the rear side of the front body part or the rearmost part side of the assembled body part, and the expansion device is extended, and the other end of the expansion device expands the reaction wall in the shaft. Pressed directly or via a spacer member, the front body part or the assembled body part (split shield)
By pushing the split shield, the expansion device can directly apply pressure to the split shield. Therefore, the split shield can be propelled while applying an eccentric moment, and the split shield can be accurately started in a predetermined direction. According to a second aspect of the present invention, in the method for starting a shield machine, the expansion device is used as a propulsion jack, and the bottom side of the propulsion jack, that is, the side opposite to the expanding / contracting rod is the front body side or the assembly side. It is characterized in that the split shield is installed on the side of the body, which makes it possible to efficiently start the split shield.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is a view showing a schematic configuration of the shield machine 10 according to the present embodiment. The shield machine 10 is mounted on the front surface and is a main cutter 21 for excavating a face and a shaft portion of the main cutter 21. 21J is controlled by a drive device 22 for rotationally driving the front body portion 11 including a screw conveyor 23 for discharging the excavated earth and sand, and a hydraulic pressure for driving the screw conveyor 23 and a shield jack 26 described later. Erector 2 for assembling a ring-shaped middle body 12 having a hydraulic control device 24 and the like installed therein and a segment 30.
5, the assembled segment 30 is pushed to divide it into three trunks, that is, a rear trunk 13 provided with a shield jack 26 for propelling the shield machine 10 and the like, and the trunks 11 to 13 are divided into vertical shafts 40. It is one that is sequentially thrown into the inside to start the assembly process. In the figure, 27
Is a watertight tail seal installed between the segment 30 and the shield machine 10, and 28 is a jack stand or strut described later, or an overhead crane used for transporting the segment 30 or the like.

Next, the starting method of the shield shield machine 10 will be described. First, as shown in FIG.
After putting the front body portion 11 into the vertical shaft 40 and arranging it on the front side of the annular starting hole 41 provided on the wall surface on the side where the tunnel is to be excavated in the vertical shaft 40, after the front body portion 11 At the end, press ring (pushing ring) as shown in Figure 2 (a)
1 and a plurality of H steels 42 as shown in FIG.
The press ring 2 is installed on the reaction force wall 42 formed of h, and a plurality of independently propelling jacks 3 are provided between the press rings 1 and 2 as shown in FIGS. 1 and 2C. An annular jack stand 4 having a cross section open to the upper side is provided, the bottom 3a of each propulsion jack 3 is pressed to the press ring 1 on the rear end side of the front body 11, and the elastic rod 3b is used as a reaction force. It installs so that it may contact the press ring 2 by the side of wall 42, respectively.

Thereafter, the propulsion jack 3 is extended to take a reaction force from the reaction force wall 42, and the front body 1
1 is pushed out by one stroke of the propulsion jack 3, a retracting prevention member (not shown) is attached to the front body portion 11, the propulsion jack 3 is contracted, and as shown in FIG. Struts 5a, which are spacer members, are installed between the table 4 and the reaction wall 42. Then, the propulsion jack 3 is re-extended while the rod 3b of the propulsion jack 3 is in contact with the strut 5a, and a reaction force is applied from the reaction force wall 42 via the strut 5a, and the front body portion 11 is further extended. Push only for one stroke. After that, after attaching the retracting prevention member to the front body portion 11, the propulsion jack 3 is returned, and the next strut (strut 5b in FIG. 4) is installed between the jack base 4 and the strut 5a. In this way, the extension of the propulsion jack 3 → the front body portion 11
4 is repeated, the propulsion jack 3 is returned, and the strut 5 is installed, thereby propelling the front body portion 11 to the vicinity of a predetermined position as shown in FIG. After that, the propulsion jack 3 is extended to propel the front body portion 11 to a predetermined position, and after the retracting prevention member is attached, the propulsion jack 3 is returned. After propelling the front body portion 11 to a predetermined position, the push wheel 1, the jack base 4, and the struts 5 (5
a to 5e) are removed to secure a space for arranging the middle body portion 12.

From the stage where the tip of the front body portion 11 exits from the starting pit 41 and penetrates into the natural ground, the main cutter 21
To drive the front body portion 11 while excavating the ground. Further, the earth and sand temporarily excavated by the main cutter 21 is conveyed by a screw conveyor 23 driven by a hydraulic control device 24 provided in the middle trunk portion 12 temporarily placed outside the shaft 40, for temporary earth removal. Through the hose 29, it is temporarily stacked at a predetermined position in the vertical shaft 40 and then discharged. At this time, depending on the ground to be dug, the front body part 11
In some cases, the tip of the nose may be nose-down, but in the present invention, the propulsion jacks 3 are independently extendable and retractable, and the push wheel 1
Since the propulsion jack 3 is installed between the reaction force wall 42 and the reaction force wall 42 or between the push wheel 1 and the strut 5, and the front body portion 11 is directly pushed out by the propulsion jack 3, unlike the conventional case, The propulsion direction of the front torso portion 11 can be corrected by controlling the attitude of the front torso portion 11 by pressing only the lower half of the propulsion jack 3.

Next, as shown in FIG. 5, the middle trunk 12 is put into the shaft 40 and placed at the rear end of the front trunk 11, and then the front trunk 11 and the middle trunk 12 are separated. To join. Hereinafter, the front body portion 11 and the combination of the front body portion 11 and the middle body portion 12 are both referred to as a split shield 14. Next, the push wheel 1 is installed at the rear end of the split shield 14, the jack stand 4 is installed between the push wheel 1 and the reaction wall 42, and the method similar to that of the front trunk portion 11 is performed. , The split shield 14 is promoted. That is, also here, the extension of the propulsion jack 3 → prevention of backward movement of the front body portion 11 → return of the propulsion jack 3 → installation of the struts 5 is repeated to propel the split shield 14 to a predetermined position as shown in FIG. The front body portion 11 is prevented from moving backward. Then, the propulsion jack 3 is returned, and the push wheel 1, the jack base 4, and the strut 5 are removed.

Finally, as shown in FIG. 7, after the rear trunk portion 13 is put into the shaft 40, the middle trunk portion 12 and the rear trunk portion 13 are connected to each other, and the shield machine 10 is assembled. The segment 30 for one ring is assembled by using the erector 25 provided on the rear trunk section 13. Next, the rear body part 13
At the rear end of the segment 30, the push wheel 1 is installed, and the jack base 4 is installed between the push wheel 1 and the reaction wall 42. The end is propelled to a position just before entering the start pit 41 (see FIG. 8). After that, shield machine 10
When the start of is completed, the shield jack 26 attached to the rear trunk portion 13 is extended to push the assembled segment 30 to take a reaction force, and the shield machine 10 is propelled. And one of the shield jacks 26
For each stroke, shrink the shield jack,
Add a new segment. This work is repeated to propel the shield machine 10, and after the frictional force between the segment and the natural ground exceeds the required thrust, the push wheels 1 and 2, the jack base 4, and the struts 5 are removed. When a nose down or the like occurs when the split shield 14 is propelled or when the shield machine 10 is started, the propulsion jack 3 is controlled and the split shield 14 or It goes without saying that the attitude of the shield machine 10 can be controlled to correct the propulsion direction.

As described above, according to the present embodiment, the shield machine 10 is provided with the front body portion 11, the middle body portion 12, and the rear body portion 1.
3, and when each of the body parts 11 to 13 is sequentially put into a vertical shaft and started while being assembled, the propulsion jack 3 is installed so that the bottom part 3a side is the split shield 14 side. On the rod 3b side of the above, by directly or through the strut 5, the reaction force wall 42 is pressed to propel the front body portion 11 or the split shield 14, so that the split shield 14 is directly pushed and propelled. As a result, the split shield 14 can be propelled while exerting an eccentric moment, and even if a nose down occurs at the time of starting, the posture of the split shield 14 is pushed by pushing only the lower half propelling jack 3. Can be controlled to correct the posture of the split shield 14. Therefore, the split shield 14 can be accurately started in a predetermined direction.

Although the shield machine 10 is divided into the front body portion 11, the middle body portion 12 and the rear body portion 13 in the present embodiment, the division method is not limited to this, and the vertical shaft is not limited to this. Depending on the size of 40 and the configuration of the shield machine 10,
It is decided as appropriate. Further, in the above example, the shield machine 1
After assembling 0, the segment 30 for one ring was assembled. However, after the shield machine 10 was propelled to the position just before the rear end of the shield machine 10 entered the start hole 41, the segment 30 was assembled. It may be assembled. Further, after the shield machine 10 is assembled, the provisional segment is provided between the reaction wall 42 and the shield machine 10 without using the propulsion jack 3 in the same manner as the starting method in the conventional integrated shield machine. Assemble the shield machine 1
The shield jack 26 of 0 may be extended to push the assembled temporary segment to generate a reaction force, to propel the shield machine, and to add the temporary segment to start the shield machine 10. . Further, in this example, the bottom portion 3a side of the propulsion jack 3 is divided into the split shield 1
Although the propulsion jack 3 is installed on the 4th side, the bottom 3a side may be mounted on the reaction wall 42 or the side of the strut 5 that faces the split shield 14. However, in this case, extra work such as movement of the jack base 4 is required, and therefore the propulsion jack 3 is preferably installed as in this example.

[0015]

As described above, according to the present invention,
When the shield machine is split and started, one end is provided with a telescopic device that abuts on the front body side or the rearmost side of the assembled body, and the telescopic device is extended, and at the other end of the telescopic device, By pressing the reaction force wall provided in the vertical shaft directly or through the spacer member, the split shield is propelled while directly pressing it.
Even when the nose down or the like occurs at the time of starting, the attitude of the split shield can be controlled to accurately start the vehicle in a predetermined direction.

[Brief description of drawings]

FIG. 1 is a diagram showing an installed state of a front body portion of a shield machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a press ring, a jack base, and a reaction force wall.

FIG. 3 is a diagram showing an installed state of a front body portion.

FIG. 4 is a diagram showing a propelled state of a front body portion.

FIG. 5 is a diagram showing an installed state of a middle body portion.

FIG. 6 is a diagram showing a propelled state of a split shield.

FIG. 7 is a diagram showing a schematic configuration of a shield machine of the present embodiment.

FIG. 8 is a diagram showing a start completion state of the shield machine of the present embodiment.

FIG. 9 is a diagram showing a conventional split start method of a shield machine.

[Explanation of symbols]

1, 2 press rings (3), 3 propulsion jacks,
4 jacks, 5, 5a-5e struts, 10
Shield machine, 11 front body part, 12 middle body part, 13
Rear trunk, 14 split shield, 21 main cutter,
21J Main Cutter Shaft, 22 Drive, 23
Screw conveyor, 24 Hydraulic control device, 25 Electa, 26 Shield jack, 27 Tail seal, 28 Overhead crane, 29 Temporary earth discharge hose, 30
Segments, 40 vertical shafts, 41 starting shaft openings, 42 reaction walls.

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 000172813             Sato Industry Co., Ltd.             11-11 Sakuragicho, Toyama City, Toyama Prefecture (71) Applicant 000230010             Geostar Co., Ltd.             4 2-3 Shiba, Minato-ku, Tokyo (71) Applicant 000001236             Komatsu Ltd.             2-3-3 Akasaka, Minato-ku, Tokyo (72) Inventor Shugi Komatsubara             2-6-2 Otemachi, Chiyoda-ku, Tokyo East             Kyoto Sewer Service Co., Ltd. (72) Inventor Shinji Yakita             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi (72) Inventor Hirokazu Tanaka             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi (72) Inventor Yoichi Moriya             2-15-2 Konan, Minato-ku, Tokyo Co., Ltd.             Obayashi Tokyo Main Office (72) Inventor Nobuo Kanazaki             4-12-20 Nihonbashihonmachi, Chuo-ku, Tokyo             Sato Industry Co., Ltd. (72) Inventor Hideki Tanaka             Geostar 4 2-3 Shiba, Minato-ku, Tokyo             Within the corporation (72) Inventor Kiyoshi Katsunuma             2-3-3 Akasaka, Minato-ku, Tokyo Co., Ltd.             Komatsu Factory F term (reference) 2D054 AA01 AC02 AD02 BA02 EA01                       EA05 EA07

Claims (2)

[Claims] 1. A shield barrel machine including a shield front body portion having a main cutter on a front surface thereof, an erector for assembling the segments, and a shield jack for pushing the assembled segment to advance the shield machine. In the starting method of the shield machine, which is divided into a plurality of barrels including, and is started while sequentially assembling each of the barrels into the shaft, one end of the front barrel is the rear side or the assembled barrel. A plurality of telescopic devices abutting on the rearmost side are provided, the telescopic device is extended, and the other end of the telescopic device presses the reaction wall in the vertical shaft directly or through a spacer member to Part or a body part assembled as described above is propelled, a method for starting a shield machine. 2. The shield according to claim 1, wherein the telescopic device is a propulsion jack, and the bottom side of the propulsion jack is installed on the front trunk side or the assembled trunk side. How to start the excavator.