JP3215091B2 - Segment shape holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for retaining a segment shape, and more particularly to a device suitable for retaining the shape of a segment lining a large-sized tunnel having a non-circular cross section.

[0002]

2. Description of the Related Art Conventionally, when excavating a tunnel with a shield excavator, a segment is lining the inner surface of the tunnel by an erector device every time the tunnel is excavated by one ring.
A backing material such as mortar or plastic material is injected between the segment and the tunnel ground. When earth pressure is applied to the covered segment from the outside to deform the circular cross-sectional shape, it becomes difficult to cover the next segment with a circular cross-sectional shape. Therefore, the shield machine is provided with a perfect circle holding device that supports the latest lined segment of the lining from the inner side and holds the segment in the perfect circle. , It is easy to cover the next one ring segment connected to the one ring segment in a perfect circular shape.

[0003] Japanese Utility Model Publication No. 4-42396 discloses that the right and left
A pair of columns, and a pair of columns disposed on opposite surfaces of the pair of columns.
A perfect circle holding device including a pair of rollers, a pair of front and rear perfect circle holding mechanisms, a connecting portion, and a gantry including a pair of right and left grooves is described. The front and rear pair of perfect circle holding mechanism units are provided with a pair of right and left perfect circle holding mechanism units having a pair of columns and a pair of rollers. It is arranged to be extendable and contractable, and guides and retains a pair of rollers back and forth along a pair of grooves.

[0004] Japanese Patent Application Laid-Open No. 9-78994 discloses that a rail disposed at the same axis as the axis of the shield machine, a frame surrounding the outside of the rail, an interval adjusting device, and a frame. A perfect circle holding device is described which has three radially arranged legs, three jacks mounted on the three legs, and a perfect circular holding frame.

The perfect circle holding device 106 shown in FIGS.
Are a pair of left and right base frames 100, a pair of columns 10
1, a pair of front and rear sliding jacks 102, two pairs of right and left vertical rods 103, a pair of upper and lower arc-shaped shape retaining frames 1
04, a pair of hydraulic cylinders 105 and the like. Left and right 1
The pair of base frames 100 is fixed to the rear end of the main body frame 107 of the shield machine by bolts in a rearward direction, and is attached to the pair of base frames 100.
A pair of columns 101 are movably held along the pair of rails 100a. In this specification, “shape retention” is synonymous with “shape retention”.

A pair of left and right sprockets 108 are mounted on the side surfaces of the pair of left and right base frames 100 in front of a start position A for starting to maintain a perfect circle shown in FIG. A pair of left and right sprockets 109 are mounted on the rear side of the b. As shown in FIG. 14, two pairs of front and rear sprockets 108 and 109 corresponding to the pair of front and rear sliding jacks 102 are provided with a pair of chains 110. It is connected to both front and rear ends of the pair of columns 101.

As shown in FIG. 13, a pair of rear left and right sprockets 109 are interlocked by a connecting rod 111, and driven by a pair of front and rear sliding jacks 102, a pair of sprockets 108 and 109 and a pair of chains are provided. The pair of columns 101 is driven to move forward through 110. Left and right pairs of rods 10 are provided at the upper and lower ends of the pair of columns 101.
3 is held so as to be able to move back and forth, and a pair of upper left and right rods 10
3 and a pair of lower left and right rods 103 are connected to a pair of upper and lower arc-shaped retaining frames 104. A pair of struts 101 have a pair of hydraulic cylinders 10 pin-connected to both upper end rod 103 and lower end rod 103.
The pair of hydraulic cylinders 105 drive the two pairs of left and right rods 103 to move back and forth, move the pair of upper and lower shape retaining frames 104 to move, and start and release the segment S in a perfect circle. .

[0008] On the other hand, in the case of a large-sized shield pit having a non-circular cross section (for example, a shield pit having an elliptical cross section), a segment ring as a tunnel lining is easily deformed, and a large amount of backing material such as mortar or plastic injection material is used. Therefore, it takes a long time to solidify, and a single circular holding device cannot exhibit a predetermined effect. Therefore, measures have been taken such as increasing the thickness of the segments or temporarily supporting the segments for a plurality of rings with a large number of auxiliary columns.

[0009]

SUMMARY OF THE INVENTION The perfect circle holding device disclosed in the above publication and the perfect circle holding devices shown in FIGS. 11 to 14 have a structure in which one or two sets of shape retaining members support the inner surface of a segment. However, only one or two ring segments can be retained. Therefore, it is not suitable for application to shield tunnels other than circular and shield tunnels having a large cross section. Conventionally, in the case of a shield tunnel with a deformed shape or a large section, if the thickness of the segment is increased, the cost of the segment becomes expensive, and when a large number of auxiliary columns temporarily support a segment for multiple rings, However, not only is the material cost of the auxiliary strut and a large amount of assembling cost for assembling the auxiliary strut repeated, but also the space inside the tunnel is narrowed and the passage is narrowed, and the workability of tunnel excavation is reduced.

On the other hand, it is conceivable to provide a plurality of sets of shape retaining members in series in the axial direction of the shield shaft in order to support segments for a plurality of rings. However, it is difficult to sequentially move the shape-retaining member at the rearmost end to the foremost side, and it has not yet been proposed or practically used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a segment shape holding device suitable for a shield tunnel having a deformed section or a large section, and to provide a segment shape holding device capable of holding a segment for a long time. That is, to provide a segment shape holding device that does not lower the workability of tunnel excavation.

[0012]

According to a first aspect of the present invention, there is provided a segment shape holding device for holding a segment covered on the inner surface of an excavated shield pit from the inside while advancing a shield excavator and holding the shape for a predetermined period. In the segment shape holding device, a base frame connected to the excavator body of the shield excavator and disposed at a substantially middle height position of the shield excavator, and mounted on the base frame in series in the axial direction of the shield excavator; Move the shape-retaining units that hold the inner surface of the segment and the shape-retaining unit that is located at the rearmost end to the front-most position by siding inside the remaining shape-holding units that hold the inner surface of the segment. And a unit transfer mechanism for mounting.

Each time a tunnel is excavated for one ring by the shield machine, the assembly of one ring segment is performed by an erector device or the like. Since the foremost one-ring segment is held in the initial shape by the foremost end shape retaining unit, the segments can be efficiently assembled following the one-ring segment. Since a plurality of shape-retaining units are arranged in series in the axial direction of the shield shaft, segments for a plurality of rings can be maintained by these shape-retaining units, and the segments of each ring can be formed over a long period of time. Shape can be preserved.

The unit transfer mechanism moves the shape-retaining unit located at the rearmost end of the plurality of shape-retaining units under the plurality of shape-retaining units and to the frontmost position. The shape-retaining unit at the rearmost segment where the backing material of the mortar or the plastic injection material has solidified can be moved to the frontmost position to provide the latest one-ring segment for shape preservation. By repeating this, the inner surface of the lining segment can be successively preserved as the shield shaft is excavated. When this segment shape retention device is applied to shield tunnels with irregular cross sections other than circular or shield tunnels with large cross sections, it is not necessary to increase the thickness of the segments, and the segments for multiple rings can be formed by a large number of auxiliary struts. There is no need to support it, and the cost of excavating shield tunnels can be greatly reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, each of the shape-retaining units comprises a pair of upper and lower shape-retaining frames and a pair of left and right supporting frames for supporting the shape-retaining frames.
A pair of pillars, a gantry fixed to the middle height portion of each of these stanchions, and a pair of left and right gantry movably on the base frame to support these gantry and move in the left-right direction. A pair of left and right slide legs, a pair of right and left hydraulic cylinders for raising and lowering a pair of upper and lower retaining frames with respect to the columns, and a pair of right and left columns for symmetrically moving the pair of right and left columns symmetrically in the horizontal direction. A pair of left and right first horizontal movement means for synchronously moving a pair of left and right slide legs of the rearmost shape retaining unit symmetrically in the left and right direction; A pair of left and right second horizontal moving means for synchronously moving a pair of left and right slide legs of the shape keeping unit symmetrically in the left and right direction is provided.

After assembling the segment for one ring, the pair of upper and lower retaining frames of the rearmost retaining unit are separated from the segment by a pair of left and right hydraulic cylinders for raising and lowering. The pair of columns are synchronously moved in the left-right direction symmetrically by a pair of left and right hydraulic cylinders for horizontal movement, and the pair of left and right slide legs are moved to the first pair of left and right first cylinders.
The horizontal movement means synchronously moves in the left-right direction symmetrically, whereby the rearmost shape retaining unit can be brought under the remaining shape retaining units.

According to a third aspect of the present invention, in the first aspect of the present invention, each of the shape-retaining units comprises a pair of upper and lower shape-retaining frames, and left and right ones for supporting these shape-retaining frames.
A pair of columns, a gantry fixed to the middle height of each of the columns, a pair of right and left hydraulic cylinders for raising and lowering a pair of upper and lower shape retaining frames with respect to the columns, and a pair of right and left columns And a pair of left and right horizontal movement hydraulic cylinders that symmetrically move the left and right sides in a symmetrical manner, and supports a pair of left and right supports of the rearmost shape retaining unit so as to be movable in the left and right direction with respect to the base frame. A pair of left and right slide legs and a pair of right and left slide legs for supporting a pair of right and left columns of the shape-retaining unit on the front end side so as to be movable in the left and right direction with respect to the base frame are provided. A pair of left and right first horizontal moving means for symmetrically moving a pair of left and right slide legs in the left and right direction, and a right and left pair of left and right symmetrically moving the left and right pair of slide legs in the left and right direction. That a pair of second horizontal moving means is provided. It is an butterfly.

A pair of upper and lower retaining frames of the rearmost retaining unit are separated from the segment by a pair of left and right hydraulic cylinders for raising and lowering. The moving hydraulic cylinder synchronously moves in the left-right direction symmetrically, and the pair of left and right slide legs on the rearmost side is synchronously moved in the left-right direction symmetrically by the pair of left and right first horizontal moving means. Of the shape-retaining units can be sunk inside the remaining shape-retaining units.

After the rearmost shape-retaining unit is transferred to the foremost end by the unit transfer mechanism, a pair of left and right slide legs on the foremost end are moved in the left-right direction by a pair of left and right second horizontal moving means. And a pair of left and right supports are synchronously moved in the left and right direction symmetrically by a pair of left and right horizontal movement hydraulic cylinders. Thereafter, a pair of upper and lower shape retaining frames can be moved by a pair of left and right hydraulic cylinders for raising and lowering to hold down the inner surface of the segment located on the foremost end side.

According to a fourth aspect of the present invention, in the second or third aspect, the unit transfer mechanism comprises:
A movable table capable of mounting and supporting a gantry of a pair of right and left columns, a plurality of elevating platforms capable of moving up and down the movable table by a predetermined small distance, respectively, and corresponding to a plurality of shape keeping units;
A hydraulic cylinder for forward feed capable of transferring a movable table on which a pair of right and left columns are mounted and supported forward to a position of a lift table adjacent to the front side on the front side.

The pair of right and left columns of the rearmost shape-retaining unit are symmetrically moved inward in the left-right direction, and the gantry of the pair of right and left columns is placed on the moving table. The moving table and the shape-retaining unit supported by the moving table are moved forward by the hydraulic cylinder for forward movement to the position of the lifting table adjacent to the front side (that is, for one ring). By repeating the above, the shape-retaining unit can be transferred forward and forward to the forefront end.

According to a fifth aspect of the present invention, there is provided the segment shape retaining device according to any one of the second to fourth aspects, wherein the shape retaining frame is expanded and contracted in the left-right direction at the left and right end portions of the main body frame. And a pair of left and right movable frames mounted so as to be capable of being mounted. In the rearmost unit, when the left and right columns are symmetrically moved in the approaching direction by the pair of left and right horizontal movement hydraulic cylinders, the pair of left and right movable frames are switched to the contracted state. In parallel with this, when a pair of left and right hydraulic cylinders for raising and lowering move a pair of upper and lower shape retaining frames toward the base frame, the shape retaining units can be sunk inside the remaining plural shape retaining units. become.

According to a sixth aspect of the present invention, there is provided the segment shape holding device according to any one of the second to fifth aspects, wherein each of the pedestals is mounted on a first supported portion supported by a slide base and a movable table. And a second supported portion to be placed and supported. The left and right columns can be moved in the left-right direction by supporting the first supported portion of each gantry on the slide leg stand, and the second supported portion of each gantry is placed and supported on the moving table to form the shape keeping unit. It can be transported forward.

According to a seventh aspect of the present invention, in the invention of any one of the first to sixth aspects, the shield pit is a shield pit having an irregular cross section other than a circle (for example, a substantially elliptical bottom having a flattened bottom portion). (Shield pit with a cross section). Therefore, reinforcement work such as increasing the thickness of the segment or erecting an auxiliary support is not required, and the working space in the shield well is not narrowed.

According to an eighth aspect of the present invention, in the fourth aspect of the present invention, a pair of front and rear direction guide rails for guiding the left side portion of the moving table and the right side portion of the moving table are provided on the base frame. A pair of guide rails for guiding in the front-rear direction is provided. When one set of shape-retaining units is placed on the moving table and the elevating platform is moved up by a predetermined small distance, it is moved forward by one ring, and then the elevating platform is lowered. Since it is supported by the two pairs of guide rails, the elevator can be returned to the original position. By repeating this, the shape keeping unit and the moving table can be transferred to the forefront end.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a segment S covered on the inner surface of a shield tunnel of a non-circular shaped section tunnel (for example, an elliptical section tunnel) excavated by the shield machine 1 shown in FIG. In the case where the present invention is applied to a segment shape holding device for the purpose. Note that the front, rear, left, and right directions toward the excavation direction are referred to as front, rear, left, and right.

As shown in FIG. 1, the shield machine 1
Excavator main body 2 and body member 3 on the outer surface of this excavator main body 2
A circular cutter disc 4 rotatably provided at the front end of the excavator body 2, a cutter driving mechanism 5 for rotating the cutter disc 4, a pair of right and left swing cutters 6, The swing cutter 6 includes a swing cutter driving mechanism 7 for swinging and driving the swing cutter 6, a plurality of shield jacks 8, an erector device 9, a mud discharging facility 10, a segment shape holding device 11, and the like.

The cutter disk 4 is disposed at the center of the machine 2 when viewed from the front, and a plurality of cutter bits 12 are provided on the front surface of the cutter disk 4. At the rear end side of the cutter disk 4, a plurality of connecting frames 13 are provided.
The annular cutter drum 14 is integrally connected via the. The cutter driving mechanism 5 includes a plurality of hydraulic motors 15.
, A pinion gear 16, a ring gear 17, and the like.
7 gear teeth 18.

As shown in FIG. 1, a chamber 20 is formed on the rear side of the cutter disk 4 inside the body member 3 via a partition wall 19, and the cutter drum 14, the hydraulic motor 15, The swing cutter 6 and the swing cutter drive mechanism 7 are mounted. In addition, 21
Indicates an annular box frame belonging to the partition wall 19 and having a U-shaped cross section. The cutter drum 14 is rotatably mounted in the annular space on the inner peripheral side of the box frame 21.
A plurality of seal members and bearings (both not shown) are mounted on both inner and outer sides of the cutter drum 14.

The pair of oscillating cutters 6 are arranged on both left and right sides of the cutter disk 4 and are arranged at a predetermined distance behind the cutter disk 4.
A plurality of cutter bits 30 are provided on the front surface of the. The swinging cutter driving mechanism 7 includes a box frame 21.
The hydraulic cutter 33 includes a hydraulic cylinder 33 that is trunnion-supported by support brackets 31 and 32 therein, a pivot shaft 34 that is pivotally driven by a pin connected to a rod portion 33a thereof via an arm member, and the like. The swing cutter 6 is attached to the driving shaft 34 and is configured such that the maximum outer diameter of each swing cutter 6 is substantially flush with the outer diameter in the major axis direction of the body member 3. still,
On the rear surface of the box frame 21, a drain pipe 35 and a water pipe 36 of the drain equipment 10 are fixed. The sign 37 is
Fig. 4 shows a man lock for adapting the worker's body to the reduced pressure.

As shown in FIG. 1, ring webs 38, 39 are welded to the inner surface of the rear end of the body member 3, and a plurality of shield jacks 8 are fixed to the ring webs 38, 39 in a penetrating state. , Rearwardly and at appropriate intervals in the circumferential direction. A spreader 40 is connected to the distal end of the rod of each shield jack 8, and the spreader 40 is brought into contact with the front end of the reinforced segment S so as to take a reaction force against the propulsive force of the shield jack 8. ing.

The erector device 9 is a known arm-type erector device, and is capable of covering a ring-shaped segment on the inner surface of a shield shaft. Although not shown,
After the backing of the segment S, a backing material such as mortar or a plastic injecting material is filled on the outside, and until the backing material or the solidifying agent is solidified (about 24 hours), the following segment shape is used. The holding device 11 presses the inner surface of the segment S.

Next, the segment shape holding device 11 will be described. As shown in FIGS. 1 and 2, the excavator body 2 is connected to a base frame 50 disposed at a substantially middle height position of the shield shaft, and the segment shape holding device 11 is provided with the base frame 50. And five shape retaining units 51 for holding the inner surface of the segment S, and a unit transfer mechanism 52.

First, the shape retaining unit 51 will be described. As shown in FIGS. 2 and 3, each shape retaining unit 51
A pair of upper and lower shape retaining frames 53 and a pair of left and right supports 54
, A frame 55, a pair of left and right slide legs 56, and a pair of hydraulic cylinders 57 for elevating and lowering. The second horizontal moving means 42 is provided in the front end side shape retaining unit 51. Each of the shape retaining frames 53 includes an arc-shaped main body frame 59 and a pair of left and right movable arc-shaped movable frames 60 which are provided at left and right end portions of the main body frame 59 so as to be able to expand and contract in the left-right direction. The main body frame 59 and the movable frame 60 are formed in an arc shape so as to follow the shape of the inner surface of the segment S.

As shown in FIG. 2 and FIG.
9 has a square pipe structure, and a slit 59a
Are formed to a predetermined length, and four engagement grooves 61 are provided inside the main body frame 59. When the movable frame 60 expands and contracts, the connecting portion between the movable frame 60 and the column 54 passes through the slit 59a. Flanges 62 and 63 are formed on the upper and lower walls of the movable frame 60,
These flange portions 62 and 63 engage with the four engagement grooves 61 and are slid and guided.

As shown in FIGS. 2, 3 and 5, the pair of right and left vertical columns 54 are arranged so as to penetrate the base frame 50 up and down without interfering with the base frame 50. At the upper end and the lower end of the support column 54, a rod 65 is held so as to be able to move back and forth.
A pair of left and right movable frames 60 is connected to the lower left and right pair of rods 65 by brackets 60a. Are connected via a pin.

As shown in FIG. 2, a bracket 59a is fixed near the center of the main body frame 59, and a bracket 60a of the pair of left and right movable frames 60 and a bracket of the main body frame 59 are provided at the upper end and the lower end, respectively. 59a
A pair of left and right horizontal movement hydraulic cylinders 66 are pin-connected between the four horizontal movement hydraulic cylinders 6, respectively.
6, the two pairs of movable frames 60 are driven to expand and contract in synchronization with the pair of hydraulic cylinders 58 (see FIG. 3), and the left and right columns 54 are synchronously moved in the left and right direction.

As shown in FIGS. 2 and 5, a pair of lifting hydraulic cylinders 57 are built in each of a pair of columns 54. For example, the rod portion of each lifting hydraulic cylinder 57 is attached to an upper rod 65. The cylinder body of each lifting hydraulic cylinder 57 is pin-connected to the lower rod 65. Incidentally, two elevating hydraulic cylinders may be built in each column 54, and these rod portions may be pin-connected to the upper and lower rods 65, respectively.

As shown in FIGS. 2 to 4, 7, and 8, a pedestal 55 that protrudes to the left and right sides of the column 54 is fixed to the middle height portion of each column 54. The gantry 55 has a first supported portion 67 that forms an outer portion and a second supported portion 68 that forms an inner portion of the gantry 55. The slide base 56 is integrally connected to the lower surface of the first supported portion 67 via a connection frame 69, and the second supported portion 68 is connected to a moving table 70.
Can be placed and supported.

As shown in FIG. 7 and FIG.
6 includes a square frame 71 having substantially the same shape as the connecting frame 69, and two pairs of roller legs 72 fixed to the front and rear of the lower surface of the square frame 71.
2, the slide base 56 is configured to be movable on the base frame 50 in the left-right direction. By the way, as shown in FIG. 4, supports 73 for mounting and supporting the slide base 56 are joined to four corners of the upper surface of the base frame 50. Each support 73 has two pairs of roller legs. A pair of beam portions 74 and 75 for moving the portion 72 left and right are provided in the left-right direction, and the beam portions 74 and 75 are parallel to each other at a predetermined interval up to about ３ of the width of the base frame 50. They are extended and joined to reach.

However, the beam portion 75 of the pair of beam portions 74, 75 is configured to be detachable by bolts or the like, and when the shield is excavated, that is, when the base frame 50 connected to the excavator body 2 advances, the beam portion 75 is moved forward. Once the beam 75 is removed, it does not interfere with the column 54. In addition, 50
Reference numerals “a” and “50b” denote beams provided to retreat the slide leg bases relative to the base frame 50 when the shield machine 1, that is, the base frame 50 advances by one ring.

As shown in FIG. 3 and FIG.
6. Between the base frames 50, a pair of left and right first horizontal moving means 41 and a pair of left and right first horizontal moving means 41 for symmetrically moving a pair of left and right slide leg stands 56 on the rearmost side and the frontmost side symmetrically in the horizontal direction. Two horizontal moving means 42 are provided. Each of the first horizontal moving means 41 includes a hydraulic cylinder 58 disposed on the rear end side of the base frame 50 outward from substantially the center in the left-right direction and connected to the base frame 50;
And a connecting portion 76 for connecting the rear end of the slide leg base 56 to the rear end of the slide leg base 56. Each of the second horizontal moving means 42 includes a hydraulic cylinder 43 which is provided outward on the front end side of the base frame 50 and is connected to the base frame 50, and a rod portion of the hydraulic cylinder 43 and a front end of the slide base 56. And a connecting portion 44 for connecting.

Next, the unit transfer mechanism 52 will be described. As shown in FIGS. 2, 4, and 5, the unit transfer mechanism 52 has a moving table 70, five elevating tables 77, and a forward hydraulic cylinder 78, and is a shape-retaining member located at the most rear end side. This is for moving the unit 51 to the position on the front end side by sunk inside the remaining four shape-retaining units 51 holding the inner surface of the segment S. Moving table 7
0 includes a pair of left and right square frame frames 79, a pair of connection frames 80 for connecting these square frame frames 79 to each other, and a pair of support frames 81.

As shown in FIGS. 3 and 4, on the upper surface of the base frame 50, there are two pairs of guide rails 8 oriented in the front-rear direction.
2 and 83 are laid, and two pairs of guide rails 82 and 8 are provided.
3, the pair of guide rails 82 is
The left side of the moving table 70, that is, the square frame 79 on the left side of the moving table 70, and a pair of guide rails 83 It is arranged in parallel at a predetermined interval at a position slightly to the right of the center in the left-right direction of the frame 50,
The right side portion of the moving table 70, that is, the right side rectangular frame frame 79 is guided. In addition, a pair of rail grooves 79 is provided on both left and right ends of the lower surface of each square frame 79.
The guide rails 82 and 83 are always engaged so as to be able to slide and guide.

As shown in FIG.
Is about 1 width of the base frame 50 as a whole in the left-right direction.
It has a length in the left-right direction of / 3, and is supported by a central portion of the base frame 50 in the left-right direction. A pair of left and right support frames 81 is fixed to both left and right ends of the upper surface of the moving table 70, and the second supported portions 68 of the pair of left and right pedestals 55 are fitted inside the support frames 81 so as to be placed and supported. It is supposed to.

Next, the lifting platform 77 will be described. As shown in FIGS. 9 and 10, the five elevating tables 77 are provided in the same number as the shape-retaining units 51 and connected in series in the front-rear direction. It is provided in the central part. The lifts 77 are configured to move integrally in the front-rear direction, and each lift 77 is configured to be able to move up and down the moving table 70 by a hydraulic cylinder 84 by a predetermined small distance. When the moving table 70 is raised, the engagement between the rail groove 79a and the guide rails 82 and 83 is not released, and the moving table 70 can move forward and backward. A pair of guide members 85 fixed to the base frame 50 are provided along the front-rear direction on both left and right sides of the five lift tables 77, and the five lift tables 77 are held between the guide members 85. (See FIG. 4).

As shown in FIGS. 4 and 8 to 10, each of the elevating tables 77 includes a base plate 77a, a frame 77b, a hydraulic cylinder 84, a connecting bracket 86, and a guide support member 87.
And links 89 and 90. The frame frame 77b is formed in a square frame shape, and a base plate 77a is fixed to an upper edge thereof. A pair of guide support members 87 having a substantially L-shaped cross section are fixed to the front and rear sides of the frame frame 77b via connection brackets 86. These base plate 77a, frame frame 77b, connection bracket 86, and guide support member 8 are provided.
7. The links 89, 90 and the hydraulic cylinder 84 are accommodated in a case frame 88 whose upper end is open. A pair of upper and lower links 89, 9 are provided at the tip of the rod portion 84a of the hydraulic cylinder 84.
A pair of upper and lower links 89 and 90 are also pivotally connected to the cylinder body. Each link 89 is pin-connected to a bracket 77c fixed near the connection bracket 86 of the base plate 77a.
8 is connected to a bracket 88a fixed to the bottom surface of the pin 8 by pins.

A pair of front and rear guide members 91 are fixed to the inner wall of the case frame 88, and a front and rear guide portion 87 of a pair of guide support members 87 is provided between the guide members 91.
is raised and lowered by a predetermined small distance by driving the hydraulic cylinder 84. Note that the pair of guide support members 87 is fixed so as to protrude above the height position of the base plate 77a of the elevating table 77, and when the guide support members 87 are raised, the moving table 70 is moved by one.
The pair of guide support members 87 support the front and back, and the moving table 70 is mounted and supported on the base plate 77a of the elevating table 77.

Next, the forward hydraulic cylinder 78 will be described. As shown in FIGS. 4 and 5, the forward hydraulic cylinder 78 moves the moving table 70, on which the pedestal 55 of the pair of right and left columns 54 is mounted and supported, to a position above the elevating table 77 adjacent to the front side forward. It has a function to transfer. That is, the hydraulic cylinder 78 is oriented in the front-rear direction at a position below the five elevating tables 77, and the case frame 8 corresponding to the base frame 50 and one of the five elevating tables 77.
8 so as to integrally drive the five lifting and lowering tables 77 in the front-rear direction by one ring.

Therefore, when any one of the five lifts 77 is lifted, the moving table 70 and the shape-retaining unit 51 mounted on and supported by the lift 77 are moved to the 5
Along with the two lifting tables 77, the hydraulic cylinder 78 is used to transfer one ring, that is, to a position above the lifting table 77 adjacent to the front side in the state before the transfer. Next, the elevating table 77 that has mounted and supported the moving table 70 advanced by one ring is lowered, and only the five elevating tables 77 are retracted to the original position by the hydraulic cylinder 78. The corresponding lifting table 77 is raised, and thereafter, the moving table 70 and the shape retaining unit 51 are similarly advanced by one ring. By repeating such a series of operations, the shape retaining unit 51 located at the rearmost end side is repeated. Can be transferred to the position on the front end side.

The segment shape holding device 11 described above
The operation of will be described. A reaction force is applied to the front end of the reinforced segment S, the shield jacks 8 are extended, the shield machine 1 is excavated by one ring, and the rod portion of the shield jack 8 corresponding to the assembly position is retracted. After that, the segment S is assembled by the erector device 9. After the assembly of the segments S for one ring is completed, the shape retaining unit 51 located at the rearmost end is transferred to the frontmost position by the unit transfer mechanism 52 as described below. Before the transfer, the five shape retaining units 51
Each presses the inner surface of the segment S for five rings.

First, the rod portion of the lifting hydraulic cylinder 57 of the shape-retaining unit 51 located at the rearmost end is retracted, and the upper and lower shape-retaining frames 5 holding the segment S
3 is moved to the base frame 50 side. Next, the hydraulic cylinder 66 for horizontal movement of the shape-retaining unit 51 and the hydraulic cylinder 58 of the first horizontal moving means 41 are synchronously driven to contract together, thereby causing the pair of columns 54 and the pair of slide legs 56 to contract.
Is moved toward the center of the tunnel, and the height and width of the shape retaining unit 51 are reduced so as to dip inside the other four shape retaining units 51. At this time, the second supported portion 68 of the gantry 55 of each support 54 is connected to the pair of support frames 8 of the moving table 70.
1 is loosely engaged. Thereafter, the connection between the hydraulic cylinder 58 and the slide base 56 is released.

Next, the elevating table 77 located at the most rear end side
Is raised by the hydraulic cylinder 84, the base plate 7
7a is in contact with the moving table 70, the pair of supporting frames 81 of the moving table 70 place and support the pair of second supported portions 68 of the shape retaining unit 51, and move in a state where the shape retaining unit 51 is supported. The table 70 is raised by a predetermined small distance, and the moving table 70 is supported back and forth by a pair of guide support members 87. Then, the hydraulic cylinder 7
8, the moving table 70 together with the five lifting tables 77,
The shape-holding unit 51 is moved forward to the front
(For one ring of the segment S).

Next, the moving table 7 moved forward by one ring
When the lifting table 77 for mounting and supporting the moving table 0 is lowered by the hydraulic cylinder 84, the moving table 70 is supported by two pairs of guide rails 82 and 83. The lifting table 77 is separated downward from the moving table 70. I do. Thereafter, only the five lift tables 77 are moved back to the original position by the hydraulic cylinder 78. Next, the lifting table 77 corresponding to the moving table 70 adjacent to the front side is raised by the hydraulic cylinder 84, and thereafter, the moving table 70 and the shape keeping unit 5 are similarly operated.
1 is advanced by one ring, and such a series of operations is repeated to form the shape retaining unit 51 located at the rearmost end side.
To the frontmost position.

Thereafter, the hydraulic cylinder 43 and the moved slide base 56 are connected to each other, and the shape retaining frame 53 of the shape retaining unit 51 is moved to the expansion side in the reverse procedure to that described above, so that the segment S immediately after lining is formed. Hold down the inner surface of. Almost in parallel with this, the outside of the segment S is filled with a backing material of a mortar or a plastic injection material, and this backing material is solidified until the backing material of the mortar or the plastic injection material solidifies (about 24 hours). The inner surface of the segment S is pressed by the shape retaining unit 51. Next, when the shield machine 1 is excavated by one ring, the base frame 50 is moved forward by one ring relative to the five shape retaining units 51. Can be moved to the position on the front end side.

The segment shape holding device 11 described above
According to the above, since the five shape-retaining units 51 are arranged in series in the axial direction of the shield shaft, the segments S for five rings can be shape-retained by the five shape-retaining units 51, In a state where a backing material such as a mortar or a plastic injection material is injected between the ground and the ground, the segments S of each ring are kept for a long time, that is, until a large amount of the injected backing material or solidifying agent is solidified. Can be shaped.

By the unit transfer mechanism 52, the shape-retaining unit 51 located at the rearmost end of the five shape-retaining units 51 is sunk inside the remaining four shape-retaining units 51 and positioned at the foremost end. In order to transfer the shape retention unit 51 at the rearmost segment S where the backing material of the mortar or the plastic injection material is solidified, the shape retention unit 51 is moved to the frontmost position.
It is possible to provide the shape of the latest one ring segment S. The rearmost shape retaining unit 51 can be quickly switched to a state in which the shape retaining unit 51 is sunk inside the remaining four shape retaining units 51, and the shape retaining unit 51 is moved to the unit transfer mechanism 5.
After the transfer to the front end side by 2, the front end segment S can be easily provided for shape keeping.

The pair of right and left columns 54 of the rearmost shape retaining unit 51 are symmetrically moved inward in the left and right direction, and the gantry 55 of the pair of right and left columns 54 is placed on the moving table 70.
Next, the elevating table 77 corresponding to the shape retaining unit 51 is raised to move the moving table 70 and the shape retaining unit 51 supported by the moving table 70 to the hydraulic cylinder 78 for forward feed.
By this, the transfer can be performed forward to the position of the elevating platform 77 adjacent to the front side (that is, for one ring), and by repeating this, the shape retaining unit 51 can be transferred forward and forward to the frontmost end.

When the left and right columns 54 are symmetrically moved in the phase approaching direction by the left and right horizontal movement hydraulic cylinders 66 in the rearmost shape retaining unit 51, the left and right movable frames 60 are moved. It is switched to a contracted state, and in parallel with this, a pair of left and right lifting hydraulic cylinders 57 move the upper and lower
By moving the pair of shape-retaining frames 53 toward the base frame 51, the shape-retaining units 51 can be brought into a state where they can dive inside the remaining four shape-retaining units 51. The first supported portion 67 of each mount 54 is
And the left and right columns 54 can be moved in the left and right direction, and the second supported portion 68 of each pedestal 55 can be placed and supported on the moving table 70 to transfer the shape retaining unit 51 forward.

Since the shield pit is a shield pit having an irregular cross section other than a circular shape, it is not necessary to perform a reinforcing operation such as increasing the thickness of the segment S or erecting an auxiliary support, and the working space in the shield pit may be reduced. Absent. When one set of shape keeping units is placed on the moving table 70 and the elevating platform 77 is moved up by a predetermined small distance, it is moved forward by one ring, and then the elevating platform 77 is lowered.
1 and the moving table 70, two pairs of left and right guide rails 82,
Since it is supported by 83 and is separated from the lift 77, the lift 77 can be returned to the original position. By repeating this, the shape retaining unit 51 and the moving table 70 can be transferred to the forefront end.

Further, even in a state in which the lifting platform 77 is lifted by a predetermined small distance, the moving table 70 can move the guide rail 82,
83 so as to be slidable back and forth.
It is possible to smoothly move forward and backward along 83.

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) Each of the five shape-retaining units 51 is provided with a pair of slide legs 56, but corresponds only to the shape-retaining unit 51 located on the rearmost side and the shape-retaining unit 51 located on the frontmost side. Slide bases (two pairs in total) are provided, and these slide bases are configured to be freely detachable from the first supported portion 67 of each base 55 and can be moved only in the left-right direction with respect to the base frame 50. Good. According to this modification, the number of slide legs can be minimized, and both the rearmost slide legs and the frontmost slide legs can move only in the left-right direction with respect to the base frame 50. Therefore, the connection state with the first horizontal moving means 41 and the second horizontal moving means 42 can be maintained.

2) Depending on the number of the shape retaining units 51, the stroke of the rod portion of the forward hydraulic cylinder 78 may be changed to move the moving table 70 by two rings of the segment S, for example. 3) The number of the shape-retaining units 51 and the elevating tables 77 is not limited to five, but may be four or less, or may be six or more. However, the shape-retaining units 51 and the elevating tables 7 always have the same number. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0064]

According to the first aspect of the present invention, since a plurality of shape retaining units are arranged in series in the axial direction of the shield shaft, the segments for a plurality of rings can be preserved by these shape retaining units. In the state where the backing material of, for example, mortar or a plastic injection material is injected between the segment and the ground, a large amount of the backing material or the solidifying agent injected into each ring segment over a long period of time, that is, injected. The shape can be kept until it solidifies. Thus, the segment can be maintained in a desired shape against the soil pressure.

The unit transfer mechanism moves the shape-retaining unit located at the rearmost end of the plurality of shape-retaining units under the plurality of shape-retaining units to a position at the foremost end. The shape-retaining unit at the rearmost segment where the backing material of the mortar or the plastic injection material has solidified can be moved to the frontmost position to provide the latest one-ring segment for shape preservation. Assuming that the unit transfer mechanism transfers the rearmost shape retaining unit to the foremost end side in one cycle, the time required for the backfill material or the solidifying agent to solidify and the time required for a plurality of cycles for a plurality of rings are determined. They can be almost matched, and the operation rate of the unit transfer mechanism can be increased.

When this segment shape retaining device is applied to a shield tunnel having a section other than a circular shape or a shield tunnel having a large section, there is no need to increase the thickness of the segment, and a large number of auxiliary columns are used to form a plurality of rings. Since there is no need to support the segment, the cost of the segment is reduced, and the material cost of a large number of auxiliary columns and the mounting cost for repeatedly mounting the auxiliary columns are not required. Therefore, the excavation cost of the shield shaft can be significantly reduced. Since there are not many auxiliary columns, the space inside the tunnel is not so narrow and the passage is not narrow, so that the workability of tunnel excavation does not decrease.

According to the second aspect of the present invention, the shape retaining unit on the rearmost end side can be quickly switched to a state in which the shape retaining unit is sunk inside the remaining shape retaining units, and this shape retaining unit is moved by the unit transfer mechanism. After being transferred to the front end side, it can be easily provided for shape keeping of the front end segment. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, the number of slide bases can be minimized, and the rearmost slide base and the frontmost slide base are both left and right with respect to the base frame. Moving only in the direction, the connection state with the first horizontal movement means and the second horizontal movement means can be maintained, and the connection and connection with the first horizontal movement means or the second horizontal movement means every time the shape retaining unit is transferred. There is no need to perform release work. Therefore, the work load can be reduced. The other effects are the same as those of the first aspect.

According to the fourth aspect of the present invention, the pair of right and left columns of the shape retaining unit on the rearmost end side are symmetrically moved inward in the left and right direction, and the gantry of the pair of right and left columns is placed on the moving table. Then, the elevator corresponding to the shape-retaining unit is raised to move the movable table and the shape-retaining unit supported by the movable table to the position of the elevator adjacent to the front side forward by the forward-feeding hydraulic cylinder (that is, (One ring)), and by repeating this, the shape-retaining unit can be transferred forward and forward to the forefront end. Therefore, the stroke of the hydraulic cylinder for forward feed can be set to one ring, and the unit transfer mechanism can be made compact. Other effects similar to those of the second or third aspect are exhibited.

According to the fifth aspect of the present invention, in the shape retaining unit at the rearmost end, when the left and right columns are symmetrically moved in the phase approaching direction by the left and right horizontal movement hydraulic cylinders, the left and right pairs are moved. The movable frame is switched to a contracted state, and in parallel with this, a pair of left and right lifting hydraulic cylinders
By moving the pair of shape retaining frames toward the base frame, the shape retaining units can be brought into a state where they can dive inside the remaining plurality of shape retaining units. In addition, the same effect as any one of the second to fourth aspects is obtained.

According to the sixth aspect of the present invention, the left and right supports can be moved in the left and right directions by supporting the first supported portion of each pedestal on the slide base, and the second supported portion of each pedestal can be moved. The shape-retaining unit can be transported forward by being placed and supported on a moving table. Therefore, a plurality of shape retaining units can be transferred by one unit transfer mechanism, and the transport system can be simplified.
In addition, the same effect as any one of the second to fifth aspects is obtained.

According to the seventh aspect of the present invention, the shield pit is a shield pit having an irregular cross section other than a circular shape. However, reinforcement work such as increasing the thickness of a segment or setting up an auxiliary column is not required, and the inside of the shield pit is not required. Work space does not become narrow. Therefore, the cost of the segment is reduced, and the material cost of a large number of auxiliary columns and the assembly cost of the auxiliary columns are not required. The workability of tunnel excavation does not decrease. Other effects similar to those of any one of the first to sixth aspects are exhibited.

According to the eighth aspect of the present invention, one set of shape-retaining units is placed on the moving table and the elevator is raised by a predetermined small distance, and is moved forward by one ring. When lowered, the shape-retaining unit and the movable table are supported by the two pairs of left and right guide rails and are separated from the lift table, so that the lift table can be returned to the original position. By repeating this, the shape keeping unit and the moving table can be transferred to the forefront end. Also,
The moving table is guided by the guide rails so as to be able to slide back and forth even when the elevating table is raised by a predetermined small distance, so that one set of shape-retaining unit and the moving table can be smoothly moved back and forth along the guide rails. Can be done. The other effects are the same as those of the fourth aspect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a shield machine according to an embodiment of the present invention.

FIG. 2 is a rear view showing the positional relationship between the shape preserving unit and another shape preserving unit during transfer.

FIG. 3 is an enlarged rear view of the shape retaining unit and a unit transfer mechanism.

FIG. 4 is an enlarged plan view (an end view taken along line IV-IV in FIG. 3) of the shape keeping unit and the unit transfer mechanism.

FIG. 5 is a longitudinal sectional view of a plurality of shape-retaining units and a unit transfer mechanism.

FIG. 6 is a partial sectional view of a main body frame and a movable frame.

FIG. 7 is an enlarged view of FIG. 3 showing a vertical positional relationship between a first supported portion of the gantry and a slide leg base.

FIG. 8 is a plan view of a first supported portion and a slide base of the gantry.

FIG. 9 is a vertical cross-sectional view showing an elevating table, a moving table, and the like of the unit transfer mechanism (the left half shows when the hydraulic cylinder is contracted, and the right half shows when the hydraulic cylinder is extended).

FIG. 10 is a plan view showing an elevating table and the like of the unit transfer mechanism.

FIG. 11 is a partially sectioned longitudinal sectional view of a conventional shield machine, and is an enlarged view of a main part of a segment perfect circle holding device, an erector device, and the like.

FIG. 12 is a rear view of the segment perfect circle holding device of FIG. 11 (the left half shows a released state of perfect circle holding, and the right half shows a perfect circle holding state).

FIG. 13 is a sectional view taken along line XIII-XIII of FIG. 11, showing a connecting rod for synchronously rotating a pair of right and left sprockets.

FIG. 14 is a sectional view taken along line XIV-XIV of FIG. 12, showing a positional relationship (connected state) between the column, the chain, and the front-rear sliding jack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Excavator main body 11 Segment shape holding device 41 1st horizontal movement means 42 2nd horizontal movement means 50 Base frame 51 Shape retaining unit 52 Unit transfer mechanism 53 Shape retaining frame 54 Prop 55 Mount 56 Slide base 57 Elevating hydraulic cylinder 59 Body frame 60 Movable frame 66 Horizontal moving hydraulic cylinder 67 First supported part 68 Second supported part 70 Moving table 77 Elevating base 78 Forward hydraulic cylinder 82, 83 Guide rail

Continuing from the front page (72) Inventor Tsutomu Nakayama 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Yoo Iso 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (56) References JP-A-4-153498 (JP, A) JP-A-6-93800 (JP, A) JP-A-6-73998 (JP, A) JP-A-62-176299 (JP, U) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/40

Claims (8)

(57) [Claims] 1. A segment shape holding device for holding a segment covered on the inner surface of a shield mine excavated while advancing a shield machine and holding the shape for a predetermined period of time, comprising: A base frame connected to the shield shaft at a substantially middle height position, a plurality of shape-retaining units mounted on the base frame in series in the axial direction of the shield shaft and pressing the inner surface of the segment; A unit transfer mechanism for moving the shape-retaining unit located at the end side to the inside of the plurality of remaining shape-retaining units holding down the inner surface of the segment and transferring the shape to the frontmost position. Segment shape holding device. 2. Each of the shape-retaining units comprises a pair of upper and lower shape-retaining frames, a pair of left and right supports for supporting the shape-retaining frames, and a gantry fixed to a middle height portion of each of the supports. A pair of left and right slide legs that are fixed to a pair of left and right gantry so as to be movable on the base frame and can move in the left and right direction while supporting these gantry, A pair of left and right hydraulic cylinders for raising and lowering, and a pair of left and right horizontal moving hydraulic cylinders for symmetrically moving a pair of right and left columns symmetrically in the left and right direction. A pair of left and right first horizontal moving means for synchronously moving the pair of slide bases in the left-right direction and a pair of left and right slide bases of the shape-retaining unit on the front end side are synchronously moved in the left-right direction. 2nd pair of left and right
2. The segment shape holding device according to claim 1, further comprising a horizontal moving unit. 3. Each of the shape-retaining units comprises: a pair of upper and lower shape-retaining frames; a pair of left and right supports for supporting the shape-retaining frames; and a gantry fixed to a middle height portion of each of the supports. A pair of left and right hydraulic cylinders for raising and lowering a pair of upper and lower shape retaining frames with respect to the support;
A pair of left and right horizontal moving hydraulic cylinders for symmetrically moving the pair of right and left columns symmetrically in the left and right direction, and a pair of right and left columns of the rearmost shape retaining unit in the left and right direction with respect to the base frame; A pair of left and right slide legs that are movably supported, and a pair of left and right ones that support a pair of left and right columns of the shape-retaining unit on the frontmost end side so as to be movable in the left-right direction with respect to the base frame.
A pair of left and right first horizontal moving means for symmetrically moving the left and right pair of left and right slide legs in a symmetrical manner in the left and right direction; and a pair of left and right frontmost slide legs. 2. The segment shape holding device according to claim 1, further comprising a pair of left and right second horizontal moving means for synchronously moving the table in the left-right direction. 4. The unit transfer mechanism, comprising: a movable table on which a pair of right and left columns can be placed and supported; and a movable table movable up and down by a predetermined small distance, and corresponding to a plurality of shape-retaining units. Multiple elevators to
4. A hydraulic cylinder for forward feeding, which is capable of transporting a moving table on which a gantry of a pair of right and left columns is placed and supported forward to a position of a lifting platform adjacent to the front side on the front side. Segment shape holding device. 5. The shape retaining frame includes: a main body frame;
The segment shape holding device according to any one of claims 2 to 4, further comprising a pair of left and right movable frames provided at left and right end portions of the main body frame so as to be able to expand and contract in the left and right directions. 6. A first supported portion in which each of the frames is supported by a slide base, and a second supported portion which is mounted and supported on a moving table.
The segment shape holding device according to any one of claims 2 to 5, further comprising a supported portion. 7. The segment shape holding device according to claim 1, wherein the shield pit is a shield pit having a non-circular shaped cross section. 8. A pair of front and rear direction guide rails for guiding the left side portion of the moving table and a pair of front and rear direction guide rails for guiding the right side portion of the moving table are provided on the base frame. 5. The method according to claim 4, wherein
3. The segment shape holding device according to item 1.