JPH0673998A - Retaining device of form of segment in shielding machine - Google Patents

Abstract

PURPOSE:To well retain the form of a segment, especially vertically longitudinal form, without hindering the assembling work of segments. CONSTITUTION:A retaining member 36 of a segment form is mounted on a supplying carrier 20 of segments so as to close or apart position it. The retaining member 36 of the segment form is provided with a pair of right and left segment-pressing members 38L, 38R. The mutual upper horizontal parts 392 are connected to each other at the upper position of the supplying carrier 20 of segments by a jack 40H supporting the upper side. And the mutual lower horizontal parts 393 are connected to each other between the lower lateral frame 27 of the supplying carrier 20 of segments and rails 18 by a jack 40L supporting the lower side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding the entire shape of an assembled segment in a shield machine capable of continuously excavating a tunnel having a cross section other than a circular shape.

[0002]

2. Description of the Related Art In various shield machines, excavation is carried out while assembling segments along the inner peripheral surface of an excavated tunnel, but since backfilling is carried out in parallel with this excavation, the pressure and the self-weight of the segment. In order to prevent the segment from being deformed due to, the segment immediately after being assembled is pressed from the inside to maintain its assembled shape.

As a device for holding such a segment shape, for example, a device disclosed in Japanese Utility Model Publication No. 3-38320 is known. This device is installed inside a shield machine that excavates a circular tunnel,
A beam extends from the front end of the shield machine body toward the rear, and a perfect circle holder is installed so that the beam can travel on the beam. A cylinder is installed in the vertical direction at the left and right positions of the perfect circle holding part, and an arcuate pressing part is fixed to the tip of a piston rod extending vertically from the cylinder. Then, the pressing portion is pressed along the inner peripheral shape of the segment by the extension of each piston rod, and the extension length is adjusted so that the perfect circle holding portion is free from the beam on the shield machine main body side. In this state, the shield machine body can be dug while the perfect circle holding portion is holding the perfect circle.

[0004]

The above segment shape retaining device has the following problems to be solved.

A) In the above apparatus, the beam extends from the front end of the shield machine body toward the rear, but this area is a work area for assembling the segments.
The beam tends to interfere with the segment assembly work.
Further, when the shield machine main body is curved, the direction of the beam extending from the shield machine main body and the direction of the segment to be supported by the shape retaining device are deviated, which makes the work extremely difficult.

B) In recent years, excavation cross-sections other than circular are required in sewers, power lines, subway tunnels, etc.
Development of a free-section shield machine for excavating a tunnel having such a cross-sectional shape is in progress. For example, in Japanese Unexamined Patent Publication No. 1-256697, in addition to excavating a central circular portion in front of the propulsion direction with a center cutter that rotates around the center axis of a shield machine, a planetary cutter (side cutter) that revolves around this center cutter is also used. ), An outer peripheral portion of the central circular portion is excavated to obtain an excavated cross section having a desired shape as a whole.

In excavation by such a shield machine, the entire shape of the segment 30 assembled on the inner peripheral surface of the tunnel must be a shape other than a circle, that is, a shape that substantially matches the excavated cross-sectional shape. Here, when the above-mentioned shape is a vertically long shape, for example, a vertically long elliptical shape, a large bending moment is likely to act on the segment forming the side wall among the segments arranged in the circumferential direction. Therefore, in this case, it is necessary to use a device for supporting the segments in the lateral direction instead of supporting the segments in the vertical direction as in the above device.

For reference, FIG. 8 shows the distribution of bending moment when the side wall portions of the vertically long elliptical segment are supported at two points. As can be seen from this figure, there is a large bending moment acting on the sides of the segment, so it is necessary to support the proper position of the side from the inside in order to maintain the shape of the segment. I understand.

In view of the above circumstances, the present invention provides a shield machine having an excavation cross section other than a circular shape, which does not hinder the segment assembling work, and moreover, presses the segment laterally from the inside thereof to maintain the shape. It is an object of the present invention to provide a segment shape holding device capable of performing the above.

[0010]

DISCLOSURE OF THE INVENTION The present invention comprises a shield machine main body, and segment supply means for traveling in the propelling direction of the shield machine and for supplying a segment to a segment assembly position in the shield machine main body. A shield machine provided in the shield machine body for assembling a segment supplied from the segment supply means along an inner circumferential surface of a tunnel, the shield machine comprising: Is provided in
A segment pressing member having a shape extending in the vertical direction and configured to be placed on the segment supply means, and an outer side portion of which is pressed against the inner peripheral surface of the segment, and upper end portions of the left and right segment pressing members are the segment An upper elastic member which is connected at a position above the assembling means and which itself expands and contracts, and lower end portions of the left and right segment pressing members are connected in the space between the segment assembling means and its traveling surface, and A lower elastic member that expands and contracts itself is provided, and the left and right segment pressing members are configured to be pressed against the segment inner peripheral surface by the extension of the upper elastic member and the lower elastic member (claim 1). ).

When the segment pressing members are placed, it is preferable that rollers that roll on the segment assembling means be mounted on both segment pressing members so as to be vertically displaceable (claim 2).

Regarding the arrangement and shape of each member,
The assembled shape of the segment is vertically symmetrical, and a plurality of pressure contact parts pressed against the inner peripheral surface of the segment are provided on the outer surfaces of the left and right segment pressing members so as to project vertically symmetrically. The members are arranged in vertically symmetrical positions, and the upper elastic member and the lower elastic member are composed of a cylinder that expands and contracts by supplying a working fluid,
It is more preferable to connect a common working fluid supply source to both cylinders.

Further, the pressure contact portion of each segment pressing member is composed of a central pressure contact portion provided at a central portion in the vertical direction, and an upper pressure contact portion and a lower pressure contact portion provided above and below the central pressure contact portion. , The central pressing portion is attached to the segment pressing member so that the protruding amount thereof is variable,
By providing the protrusion amount adjusting means for increasing / decreasing the protrusion amounts of the left and right press-contact portions, the more excellent effect described below can be obtained (claim 4).

[0014]

According to the apparatus of the first aspect, the segment can be assembled and its shape can be maintained by the following procedure, for example.

First, by mounting the left and right segment pressing members on the segment supply means, the segment pressing means and the segment pressing members can be advanced in the same direction as the shield machine is dug. At this time, the upper elastic member connecting the upper end portions of both segment pressing members is located above the segment supply means, and the lower elastic member connecting the lower end portions of both segment pressing members is the segment assembly. Since it is located in the space between the means and its travel surface, it does not hinder the travel of the segment supply means.

Next, after the segments supplied from the segment supplying means are assembled in the circumferential direction by the segment assembling means, both the elastic members are extended at positions corresponding to the segments, so that the left and right segment pressing members are evenly distributed to the left and right. Can be pressed against the sides of the segment assembly, which allows the segment to retain its shape. At this time, since the left and right segment pressing members are fixed to the segment side by the frictional force, it is possible to advance only the segment conveying means by following the excavation of the shield machine main body while keeping the segment pressing members stationary. it can.

Further, according to the apparatus of the second aspect, both segment pressing members can be made to run on the segment supplying means by rolling of the rollers while both segment pressing members are placed on the segment supplying means. On the other hand, it is possible to completely separate the segment pressing member from the segment supplying means by displacing the roller upward while the left and right segment pressing members are pressed against the segment by extending both the elastic members and separating them from the segment supplying means. In this state, only the segment supply means can be smoothly advanced.

Further, in the apparatus according to claim 3, the assembled shape of the segments, the protruding positions of the pressure contact portions of the left and right segment pressing members, and the disposing positions of the upper elastic member and the lower elastic member are vertically symmetrical. Also, since the working fluid is supplied to each cylinder from a common working fluid supply source, the supply of this working fluid causes the upper elastic member and the lower elastic member to extend with the same force, so that The press contact portion can be pressed evenly on the inner peripheral surface of the segment.

Further, according to the apparatus of the fourth aspect, by increasing or decreasing the protrusion amount of the central pressure contact portion of each segment pressing member, the pressure contact force between these center pressure contact portions and the segments, and other pressure contact portions are increased. The ratio with the pressure contact force with the segment can be adjusted.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

2 and 3, reference numeral 10 denotes a skin plate of the shield machine main body, and in this embodiment, the skin plate 10 is formed in a vertically elongated elliptical shape. At the front end of the skin plate 10, a rotary cutter for excavating in a vertically elongated elliptical shape is equipped, and an erector device (segment assembly means) 14 is arranged behind the rotary cutter. The erector device 14 is installed in the skin plate 10 and has a plurality of (seven in the illustrated example) segments 16 arranged in a vertically elongated elliptical shape in the circumferential direction along the inner circumferential surface of the tunnel as shown in FIG. It is to be assembled.

A rail support beam 17 is passed laterally to the lower part of the segment 16 already assembled at the rear of the erector device 14 (right side in FIGS. 2 and 3), and a shield machine is provided on the rail support beam 17. A pair of left and right rails 18 are laid along the excavation direction of
The segment supply cart 20 is installed above. In the segment supply cart 20, the segment carried in by a segment transport cart (not shown) is used to eject the segment.
For supplying to the segment receiving position.

The segment supply cart 20 is provided with a pair of left and right lower bones 22 and upper bones 24 extending in the traveling direction,
The lower bone 22 and the upper bone 24 are connected to each other via vertical columns 26, and the lower bones 22 and the upper bones 24 are connected to each other via horizontal horizontal bones 27. Wheels 28 are attached to the lower surface of the lower bone 22, and the wheel 28 rolls on the rails 18 so that the entire segment supply cart 20 travels.

A segment suspension beam 30 extends forward from the front ends of the left and right upper bones 24.
A lateral support bone 31 is fixed to the upper surface of 0, and a segment assembly work plate 32 is provided above it. The segment assembly work plate 32 is configured to be rotatable between a fallen position (solid line position in FIG. 2) in contact with the support bone 31 and a standing position (two-dot chain line position in FIG. 2). It is a scaffold for segment assembly when in the lying position.

Incidentally, reference numeral 34 in FIG. 2 is a ladder for an operator to move up and down.

A plurality of (two in the illustrated example) segment shape holding members 36 are mounted side by side in the front-rear direction on the segment supply cart 20.

Each segment shape holding member 36 includes a pair of left and right segment pressing members 38L and 38R.
Each segment pressing member 38L, 38R has a vertical portion 391.
And an upper horizontal portion 392 that extends inward from the upper end of each vertical portion 391, and a lower horizontal portion 393 that extends inward from the lower end of the vertical portion 391. The portion 393 extends inward through the space between the lower bone 22 and the rail 18.

The upper horizontal portions 392 are connected to each other above the segment supply cart 20 via an upper jack (upper elastic member) 40H composed of a hydraulic cylinder, and the lower horizontal portions 393 are connected to the lower jack (lower side). Elastic member) 40L
Is connected below the lower lateral bone 27 via the. Specifically, the head side end of the upper jack 40H is a pin 46H.
The upper horizontal portion 3 of the right segment pressing member 38R through
The upper end of the upper jack 40H has a connecting portion 42H that is rotatably connected to the end portion of the pin 92 and that has a connecting portion 42H.
It is rotatably connected to the end portion of the upper horizontal portion 392 of the left segment pressing member 38L via 4H. Similarly,
The head-side end portion of the lower jack 40L is rotatably connected to the end portion of the lower horizontal portion 393 of the right segment pressing member 38R via a pin 46L.
The connecting portion 42L provided at the rod tip of the lower horizontal portion 39 of the left segment pressing member 38L via the pin 44L.
It is rotatably connected to the end portion of 3.

That is, one segment shape holding member 36 has a rectangular ring shape having an upper jack 40H, a left segment pressing member 38L, a lower jack 40L, and a right segment pressing member 38R in this order.

A roller mounting bracket 48 is projectingly provided on the inner side surfaces of the vertical portions 391 of the left and right segment pressing members 38L and 38R, and a roller 50 is rotatably mounted on the lower surface thereof. Two
It is placed on the upper and lower bones 24 of 0.

Details of the structure are shown in FIGS. A pair of left and right roller support plates 49 are provided so as to project downward from the lower surface of the mounting bracket 48, and rollers 50 are arranged between the roller support plates 49. The roller 50 includes a circular roller body 51 and a rotating ring 52 provided on the outer peripheral surface of the roller body 51. The rotating ring 52 is fitted between the positioning rings 54 fixed to both ends of the roller body 51, and is rotatable relative to the roller body 51 coaxially therewith. Then, by the rolling ring 52 rolling on the upper bone 24, the segment shape holding member 36 as a whole can move forward and backward with respect to the segment supply cart 20 while being placed on the upper bone 24. ing.

A horizontal rotation center shaft 56 is fixed to the roller body 51 so as to extend therethrough. The rotation center shaft 56 is eccentric from the center shaft of the roller body 51 by a predetermined amount. A nut 58 or the like is attached to one end of the rotation center shaft 56, and this end is attached to one roller support plate 49.
It is configured so as not to come off, and a sleeve 60 is mounted around the other end through a key 59 so as not to be relatively rotatable. A lever 62 extending in the direction of the turning radius is fixed to the outer peripheral surface of the end portion of the sleeve 60.

Left and right segment pressing members 38L, 38R
Center press contact plates 70L, 70R, which are in pressure contact with the inner peripheral surface when the segment is pressed, are provided at the center of the outer surface of each of the upper press contact plates 71L, 71L, 70L, 70R. 71R and lower pressure contact plates 72L, 7
2R is provided. Among these pressure contact plates, the upper pressure contact plates 71L and 71R and the lower pressure contact plates 72L and 72R are completely fixed to the segment pressing members 38L and 38R main bodies, while the central pressure contact plates 70L and 70R have the protrusion amount. It is configured to be adjustable. The structure is shown in FIG.

As shown in the drawing, in the vertical portion 391 of the segment pressing member, the adjusting jack 78 is installed outward in the horizontal direction, and the pressure contact plate supporting member 80 is fixed to the rod end portion thereof. The central press plate 70L is fixed to the surface of the member 80. A spring mounting portion 74 extends radially outward from a peripheral edge portion of the central pressure contact plate 70L, and an end portion of the spring mounting portion 74 is pulled by a spring mounting portion 75 fixed to the vertical portion 391 side. They are connected via a spring 76. Therefore, the amount of protrusion of the central pressure contact plate 70L from the outer surface of the vertical portion 391 is changed by the expansion and contraction of the adjustment jack 78.

Next, the upper and lower support jacks 40H, 40
A hydraulic circuit for driving the L and left / right adjustment jacks 78 will be described with reference to FIG. 7.

In the figure, a pump 80 as a hydraulic pressure supply source
Is connected to the tank 82 via a line 83 and a main relief valve 81. A line 84 branches from the line 83, and the line 84 branches into lines 85 and 86. The line 85 is branched into lines 87 and 88,
The line 87 is connected to the rod side chamber of the upper support jack 40H,
Lines 88 are connected to the rod-side chambers of the lower support jack 40L, respectively. Similarly, line 86 is line 9
The line 90 is connected to the head side chamber of the upper support jack 40H, and the line 91 is connected to the head side chamber of the lower support jack 40L. Lines 93 and 94 branch off from the middle of the lines 85 and 86, and both lines 93 and 94 join the line 96 and are connected to the tank 82.

Electromagnetic switching valves 971, 972, 973, 974 are provided in the middle of the lines 85, 86, 93, 94, respectively. These electromagnetic switching valves 971-9
74 is configured to block each line at the left position in the figure and communicate each line at the right position. Pilot check valves 981 and 982 are provided in the lines 85 and 86, and both pilot check valves 981 and 982 are
It is configured to operate by taking in the secondary pressure of the partner pilot check valves 982, 981 as pilot pressure. Further, the lines 87, 88, 90, 91 are provided with check valve-equipped flow control valves 991, 992, 993, 994.
Is provided.

A pressure switch 100 and a pressure gauge 102 are connected in the middle of the line 91. The pressure switch 100 is configured such that the head side pressure of the lower jack 40L is a preset constant value, specifically, the pressing portions 70L, 70R,
When the values of 71L, 71R, 72L, and 72R reach a value corresponding to the pressure when they are sufficiently pressed against the inner peripheral surface of the segment 16, they are switched from off to on and externally displayed.

A line 104 is branched from the line 83, the line 104 is branched into lines 106 and 107, and the line 106 is branched into lines 112 and 113, which are connected to the rod side chambers of both adjusting jacks 78. ,
A line 107 branches into lines 115 and 116 and is connected to the head side chambers of both adjustment jacks 78. Line 1
06 and 107 are electromagnetic switching valves 109 and 1 similar to those described above.
10, pilot check valves 118 and 121, and flow control valves with check valves 119 and 122 are provided.
In addition, both the adjustment jacks 11 are provided on the lines 115 and 116.
A pressure gauge 124 for detecting the head side pressure of 2,113 is provided.

In line 106, a line 126 branches from between the pilot check valve 118 and the flow rate adjusting valve with check valve 119, and in line 107, the pilot check valve 121 and the flow rate adjusting valve with check valve 12 are branched.
The line 127 is branched from the line 2 and the line 12
6 is provided with a check valve 129, and line 127 is provided with a check valve 130.

On the other hand, lines 136 and 135 are branched from the lines 88 and 90, both lines 136 and 135 are joined to the line 134 and then to the line 132, and a relief valve 138 is attached to the line 135. A check valve 139 is provided in the line 136.

Next, how to use this apparatus will be described.

First, the upper and lower support jacks 40H and 40L
And the roller 50 to the segment supply cart 20
In the state of being placed on the upper bone 24 of each of the press contact plates 70L, 7L
0R, 71L, ... Are separated from the inner peripheral surface of the segment 16, and the segment supply carriage 20 and the segment shape holding member 36 can travel integrally on the rail 18. Therefore, the segment supply carriage 20 is advanced as the shield machine body is dug, and the segment supply carriage 2 is moved forward.
By supplying a segment from 0 to the erector device 14, this segment can be assembled by the erector device 14 at a predetermined position on the inner circumferential surface of the tunnel.

The left and right segment pressing members 38L,
The upper horizontal portions 392 of the 38R are segment supply carts 2
The lower end horizontal portion 39 is connected at a position higher than 0.
Since the three members are connected in the space between the lower bone 22 and the rail 18, these segment pressing members 38L, 38
R does not hinder the traveling of the segment supply cart 20.

After the segment is assembled, the entire segment shape holding member 36 is moved relative to the segment supply carriage 20 while rolling the rotary ring 51 of the roller 50, and the segment shape holding member 36 is set at the position corresponding to the segment. At this position, when only the electromagnetic switching valves 972, 973 shown in FIG. 7 are switched to the right position, the common pump 80 supplies hydraulic oil to the head-side chambers of the upper support jack 40H and the lower support jack 40L. Both support jacks 40H, 4
0L extends evenly, and each pressing portion 70L, 70R, 71
L, ... Are pressed against the inner peripheral surface of the segment 16. Since the pressure switch 100 is switched from OFF to ON at the time when they are sufficiently pressed against the segment 16,
From the display of the pressure switch 100, it can be understood that the complete pressure contact state has been reached. In this overhanging state, the side portion, which is a particularly weak part of the vertically assembled elliptical segment, is pushed out from the inside, so that the assembled shape of the segment 16 collapses when backfill injection is performed in this state. Can be prevented.

When the pressure switch 100 is turned on, the pressure contact plates 70L, 70R, ... Are sufficiently pressed against the inner peripheral surface of the segment, and the segment shape holding member 36 is fixed to the segment 16 side by the frictional force of both. There is. In this state, the lever 62 is rotatably operated to eccentrically rotate the roller main body 52, so that the entire roller 50 moves from the solid line position (that is, the position in contact with the upper bone 24) shown in FIG. Move upwards until. As a result, the entire segment shape holding member 36 is completely deposited on the side of the segment 16 and is completely floating from the segment supply cart 20. In this state, only the segment supply cart 20 can be added while properly connecting the rails 18. By moving forward, it is possible to cope with the next excavation.

After completion of this excavation, the lever 62 is
Back to the original position to bring the roller 50 into contact with the upper bone 24, and then only the electromagnetic switching valves 971 and 974 are switched to the right position to contract the upper and lower support jacks 40H and 40L and to press the pressure contact plates 70L. , 70R, 71L, ... Are separated from the inner peripheral surface of the segment. As a result, the entire segment shape holding member 36 can be lowered onto the segment supply cart 20. After that, by repeating the above work, the segments 16 can be assembled in order as the shield machine is dug.

According to such a device, the following effects can be obtained.

(A) As in the conventional case, the segment shape holding member 3 is provided on the beam extending rearward from the shield machine main body side.
6 is not supported, but the segment shape holding member 36 is placed on the generally used segment supply carriage 20 to carry the same, so that an obstacle (the beam) is present at the segment assembly position. Disappear. Therefore, the segments can be assembled more smoothly.

(B) A pair of right and left segment pressing members 38L and 38R extending vertically are connected to each other by an upper support jack 40H and a lower support jack 40L, and both support jacks 4
Segment pressing members 38L, 38 by extension of 0H, 40L
Since R is pressed against the side of the segment 16 from the inside, a uniform supporting force can be applied from the inside to the side of the segment on which the largest load is applied, which allows it to be assembled into a vertically long shape. The shape of the segment can be maintained well. Moreover, the left and right segment pressing members 38 by the supporting jacks 40H and 40L
Since the L and 38R are connected to each other in a space above the segment supply carriage 20 and in a space between the upper surface of the rail 18 which is the traveling surface of the segment supply carriage 20 and the lower bone 24, the segment supply carriage is It does not hinder the running of 20.

(C) The assembling shape of the segment 16 is vertically symmetrical, and the pressure contact plates 70L, 70R, 71L, 71
Arrangement position of R, 72L, 72R and vertical support cylinder 4
Since the arrangement positions of 0H and 40L are set to vertically symmetrical positions and the common pump 80 is connected to both support cylinders 40H and 40L, the pressure contact plates 71L, 71R and 72 are connected.
The L and 72R can be pressed against the inner surface of the segment 16 with a uniform pressure. Therefore, it is possible to easily set these pressure contact forces.

(D) By connecting the central pressure contact plates 70L and 70R to the adjustment jack 78, the amount of protrusion thereof can be made variable, and the adjustment jack 78 is connected to the pump 80 which is a common supply source. Therefore, by protruding the adjustment jack 78 evenly by the oil discharged from the pump 80, the protrusion amounts of the left and right central pressure contact plates 70L and 70R can be changed while being equalized. By adjusting the protrusion amount, The balance between the pressure contact forces of the central pressure contact plates 70L, 70R and the upper and lower pressure contact plates 71L, 71R, 72L, 72R can be freely changed. Specifically, only the electromagnetic switching valve 110 shown in FIG. 7 is switched to the right position in the figure, and the adjustment jacks 112 and 113 are projected against the tensile force of the tension spring (see FIG. 6) and detected by the pressure gauge 124. When the head side pressure reaches a pressure corresponding to a desired protrusion amount, the electromagnetic switching valve 110 is switched to the left position in the figure to simultaneously and evenly adjust the protrusion amounts of the central pressure contact plates 70L and 70R. You can

The present invention is not limited to such an embodiment, and the following modes can be adopted as an example.

(1) In the present invention, the assembling shape of the segment is not limited to the above-mentioned vertically elongated elliptical shape, but the present invention has an excellent effect when the segment is assembled into a vertically elongated shape such as an oval shape or an vertically elongated rectangle. Demonstrate.

(2) In the present invention, the upper elastic member and the lower elastic member are not limited to hydraulic cylinders, but may be hydraulic cylinders or the like. Also in this case, by connecting a common working fluid supply source to the vertical expansion / contraction member, the pressure contact force can be made uniform in the vertical direction.

(3) In the above embodiment, three pressure contact plates are arranged one above the other, but in the present invention, the number of pressure contact parts is not particularly limited as long as it is plural.

[0057]

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

In the apparatus according to the first aspect of the present invention, the segment pressing member is placed on the segment supply means that moves forward following the shield machine body, and the segment pressing member is carried. As compared with a device that supports a segment shape holding member on a beam extending from the side to the rear, there is no obstacle (the beam) when assembling the segment. Therefore, the segments can be assembled more smoothly.

Moreover, the left and right segment pressing members extending vertically are connected by the upper elastic member and the lower elastic member, and the segment pressing members are pressed against the side portions of the segment 16 from the inside by the extension of both elastic members. Therefore, when assembling the segment in a vertically long shape, it is possible to apply a uniform supporting force from the inside to the side portion of the segment, on which the largest load acts, from the inside, whereby the assembled shape of the segment can be favorably maintained. In addition, since the left and right segment pressing members are connected to each other by the elastic member in the space above the segment supply means and the space between the traveling surface of the segment supply means and the segment supply means, the segment supply means It does not hinder driving.

Further, in the apparatus according to the second aspect, the segment pressing member is run while the roller is rolling while the segment pressing member is placed on the segment supplying device, so that the segment supplying device is kept stationary. While the segment pressing member can be positioned at a predetermined position, when the segment pressing member is pressed against the segment, the roller is displaced upward to float from the segment supply means, so that the segment pressing member remains stationary. There is an effect that only the segment supply means can freely travel.

According to the third aspect of the present invention, the assembling shape of the segments is vertically symmetrical, the pressure contact portions and the upper and lower cylinders are arranged at vertically symmetrical positions, and a working fluid common to both cylinders is supplied. Since the source is connected,
The pressure contact portion can be pressed against the inner surface of the segment 16 with even pressure in the vertical direction. Therefore, there is an effect that each pressure contact force can be easily set.

Further, in the apparatus according to the fourth aspect, since the means for uniformly increasing and decreasing the protrusion amount of the left and right central pressure contact portions is provided, the pressure contact force and the vertical pressure contact at the center pressure contact portion are changed by the change of the protrusion amount. There is an effect that the balance with the pressure contact force in the part can be freely adjusted.

[Brief description of drawings]

FIG. 1 is a front view of a segment shape retaining device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional side view of the device.

FIG. 3 is a plan view of the device.

FIG. 4 is a side view showing a rotating structure of a roller in the apparatus.

FIG. 5 is a sectional front view showing a rotating structure of the roller.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a circuit diagram of a hydraulic circuit provided in the device.

FIG. 8 is an explanatory diagram showing a distribution of bending moments when the segments are assembled into a vertically elongated elliptical shape.

[Explanation of symbols]

 10 Skin Plate (Shield Machine Main Body) 14 Electa Device (Segment Assembly Means) 16 Segment 18 Guide Rail 20 Segment Supply Carriage (Segment Supply Means) 36 Segment Shape Holding Member 38L, 38R Segment Pressing Member 40H Upper Support Cylinder (Upper Stretching Member) 40L Lower support cylinder (lower elastic member) 50 Roller 70L, 70R Central pressure contact plate 71L, 71R Upper pressure contact plate 72L, 72R Lower pressure contact plate 78 Adjustment jack (projection amount adjusting means) 80 Pump (working fluid supply source and protrusion) Quantity adjustment means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shohei Senda 1-7-2 Taito, Taito-ku, Tokyo Inside the Foundation Civil Engineering Research Center (72) Inventor Noriaki Maeda 6-19-1 Toyohachi, Kasukabe City, Saitama Prefecture (72) Inventor Atsuro Akiyama 1-3-18 Wakihamacho, Chuo-ku, Kobe In-house Kobe Steel, Ltd. (72) Inventor Kazuo Namiki 1-3-18 Wakihamacho, Chuo-ku, Kobe Kobe, Ltd. Steel Works Kobe Head Office (72) Inventor Susumu Fujimura 1-3-18 Wakihamacho, Chuo-ku, Kobe City Kobe Steel, Ltd. Kobe Head Office

Claims (4)

[Claims] 1. A shield machine main body, segment supply means installed for traveling in the propulsion direction of the shield machine, for supplying a segment to a segment assembly position in the shield machine main body, and provided in the shield machine main body. And a segment assembly means for assembling the segments supplied from the segment supply means along the inner circumferential surface of the tunnel, the shield machine being provided on both left and right outer sides of the traveling path of the segment supply means and extending in the vertical direction. Has a shape and is configured to be placed on the segment supply means,
A segment pressing member whose outer portion is pressed against the inner peripheral surface of the segment, an upper elastic member that connects the upper end portions of the left and right segment pressing members to each other at a position above the segment assembling means, and expands and contracts itself. Of the segment pressing member is connected in the space between the segment assembling means and the running surface, and comprises a lower elastic member that expands and contracts itself, and the upper elastic member and the lower elastic member of A segment shape retaining device in a shield machine, wherein left and right segment pressing members are configured to be pressed against the inner peripheral surface of the segment by extension. 2. The segment shape maintaining device for a shield machine according to claim 1, wherein rollers that roll on the segment assembly means are mounted on both segment pressing members so as to be vertically displaceable. Shape retention device in. 3. The segment shape maintaining device for a shield machine according to claim 1, wherein the assembled shape of the segments is vertically symmetrical, and the segment inner peripheral surface is pressed against the outer surface of the left and right segment pressing members. A plurality of press contact portions are provided at vertically symmetrical positions, the upper elastic member and the lower elastic member are arranged at vertically symmetrical positions, and the upper elastic member and the lower elastic member are expanded and contracted by supplying a working fluid. A segment shape maintaining device in a shield machine, comprising a cylinder, and a common working fluid supply source is connected to both cylinders. 4. The segment shape maintaining device for a shield machine according to claim 3, wherein the pressure contact portion of each segment pressing member is provided with a center pressure contact portion provided at a central portion in the vertical direction and above and below the center pressure contact portion. The upper pressure contact portion and the lower pressure contact portion are attached to each other, and the central pressure contact portion is mounted on the segment pressing member so that the protrusion amount is variable, and the protrusion amounts of the left and right pressure contact portions are increased or decreased to be equal to each other. A segment shape retaining device in a shield machine, comprising a quantity adjusting means.