JP2001254599A - Segment's complete roundness maintaining device for shield excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment's complete roundness maintaining device for a shield excavator which easily maintains complete roundness of a segment support structure body even if the inside diameter of the segment support structure body changes. SOLUTION: Outside a beam 4 whose both ends are pressed and expanded by an expanding jack 13, a plurality of adjusters 5 are provided which comprise a rod-like adjusting screw 7 for adjusting radial position of a segment 2 of a contact plate 6 relative to an inside peripheral surface, a handle 8 which is engaged with the adjusting screw 7 and can be manually operated, and a regulating block 10 which is fixed to the beam 4 and regulates the radial position of the handle 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is arranged behind a shield machine, and pushes and expands a group of segments assembled over the entire inner peripheral surface of an excavation pit so as to hold the shape of the excavator in a perfect circle. The present invention relates to a segment roundness holding device for a shield machine.

[0002]

2. Description of the Related Art In a tunnel excavation work using a shield machine, a curved support plate made of concrete, which is generally referred to as a segment, is assembled in a circumferential direction of the excavation pit using a segment assembling apparatus to construct a support structure. I do. As described above, since the segments are heavy objects that constitute the support structure that supports the inner surface of the digging pit, as the diameter of the digging pit increases, the weight of the segments assembled on the inner surface of the digging pit also increases, and the ceiling side The segments do not sag to the desired circular support structure shape. When the shape of the support structure of the segments is disturbed in this way, the positional deviation between the existing segment and the new segment increases, and it becomes difficult to fasten the two with bolts.

Therefore, conventionally, for example, Japanese Patent Application Laid-Open No. 8-109
As disclosed in Japanese Patent Application Publication No. 796, a pair of left and right arc-shaped beams having a diameter equal to the inner diameter of the excavation pit are disposed at the upper and lower portions behind the segment assembling apparatus of the shield machine. There has been provided a perfect circle holding device for correcting the shape of the support structure of the segment to be a perfect circle by pushing up and down by the expansion jack.

[0004]

By the way, the thickness of a segment changes in a portion where a horizontal hole is formed in a drilling pit or a curved pit is formed. In such a case, in order to cope with a change in the inner diameter of the support structure, a thickness adjusting member for adjusting the thickness between the beam and the curved grounding plate made of polyurethane attached to the surface of the beam. The ground plate can be brought into contact with the surface of the segment.

[0005] Since the thickness adjusting member is provided at the working portion of the beam that pushes up the heavy segment, a rigid member such as a steel plate is used to withstand the stress. Then, the thickness adjusting member is bolted to the surface of the beam by a manual operation of an operator. As described above, since the thickness of the segment may vary depending on the condition of the construction site, in order to cope with the case where the thickness of the segment varies, a large number of thickness control members having different thicknesses must be prepared in advance. In addition, capital investment costs are incurred, and the operation efficiency of the thickened member is poor.

[0006] In addition, the work of attaching the thickening member to the surface of the upper beam is a heavy work, which takes a lot of time and is dangerous because the thickening member is heavy and the work place is at a high position. Was. In addition, it is conceivable to increase the maximum extension amount of the pair of extension jacks for expanding and contracting the pair of beams and control the extension amount so as to cope with a change in the inner diameter of the support structure. Precisely controlling the amount is actually quite difficult. The present invention has been made in order to solve such a problem in the related art, and it is possible to easily maintain the shape of the segment support structure in a perfect circle even when the inner diameter of the segment support structure changes. It is an object of the present invention to provide a segment perfect circle holding device of a shield machine capable of performing the following.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a plurality of adjusting means for adjusting the amount of movement of the installation plate in the radial direction are provided at predetermined intervals in the circumferential direction of the beam. Preferably, the adjusting means has a rod-shaped adjusting screw one end of which is locked to a ground plate and a thread groove is provided on a peripheral surface, and a handle which is screwed to the adjusting screw and can be manually operated. And a regulating member fixed to the beam to regulate the radial position of the handle, and the ground plate is rotatably connected to one end of the adjusting screw via a rotary joint.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a segmented roundness holding device of a shield machine according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a schematic configuration of a shielded machine equipped with the segmented roundness holding device as viewed from the side. , FIG.
FIG. 4 is a front view of an outer diameter adjuster provided at an outer edge portion of the perfect circle holding device, and FIG. 4 is a cross-sectional view of a main part of the perfect circular holding device taken along section line XX in FIG. In FIG. 1, both the jack cover and the guide cylinder are shown as seen through. In these figures, 1 is a shield excavator, 2 is a segment assembled on the inner surface of the excavation pit, and 3 is a rear-mounted segment 2 provided on the rear part of the main body of the shield excavator 1 and assembled on the inner surface of the excavation pit. A perfect circle holding device 4 that pushes up and holds the inner diameter of the group of segments 2 in a perfect circle is disposed movably in the vertical direction above and below the perfect circle holding device 3 and has a substantially arc shape along the inner surface of the excavation pit. A pair of beams 5 each having an E-shaped cross section are mounted in a plurality along the circumferential direction of the beam 4, in this example, five beams, and are adjusters that are attached to the segments 2 assembled on the inner surface of the excavation pit. .

A guide hole 4a is formed in the outer annular plate of the beam 4 at a place where the outer diameter adjuster 5 is attached in a pair along the circumferential direction, and a guide hole 6 contacts the inner surface of the excavation pit. A grounding plate having a hard urethane resin coated on the surface of a steel plate, an adjusting screw 7 is attached to the grounding plate 6 so as to be swingable about a vertical direction, and a thread groove is provided on an outer peripheral surface of the columnar steel material. A handle for adjusting the radial position of the ground plate 6 from the beam 4, provided with a female screw portion screwed to the distal end side of the screw 7 on the inner peripheral surface;
9 is screwed onto the base end side of the adjusting screw 7, and after the radial position of the ground plate 6 is adjusted, a tightening nut which is tightened to fix the position is fixed. A cylindrical restricting block fixed to the beam 4 and having the adjusting screw 7 loosely fitted therein, 11 is a spherical joint for swingably connecting the ground plate 6 to the adjusting screw 7, 12 is both ends of the ground plate 6 on the circumferential side. And a pair of guide rods that are provided so as to hang from the inner side to the inner side, and are loosely fitted in the guide holes 4 a of the beam 4.

Reference numeral 13 denotes an expansion jack which engages with both ends of the beam 4 and pushes the beam 4 up and down.
Reference numeral 4 denotes a connecting column having one end fixed to the bottom of the expansion jack 13 and the other end engaging with both ends of the lower beam 4 to transmit a pressing force. One end of each of the guides 16 is fixed to both ends of the upper beam 4 so as to cover the periphery of the expansion jack 13 and guide 15.
Is provided so that it can be inserted into the inside, 17 is a column forming the body of the shield machine 1, 18 is a shield jack for propelling the shield machine 1 main body, 19 is one end fixed to the column 17 and horizontally An extended base, 20 is a traveling body that is supported on the gantry 19 while supporting the perfect circle holding device 3, and 21 is a traveling jack whose bottom side is fixed on the gantry 19 and drives the traveling body 20 to travel. , 22 are segment assembling devices for assembling the segments 2 on the inner surface of the excavation pit.

Next, the operation of this embodiment will be described. The shield machine 1 is propelled by extending the shield jack 18 while excavating the ground. At this time, in the perfect circle holding device 3, the expansion jack 13 is extended, the upper and lower beams 4 press and support the second segment 2 from the face side, and the traveling jack 21 is in a stretchable state. As the shield excavator 1 is propelled, the support 17 and the gantry 19 also move forward, so that the traveling body 20 is left behind and relatively moves on the gantry 19 rearward. When the shield machine 1 is propelled by a predetermined distance and a sufficient space is formed in front of the first segment 2 from the face side, the propulsion is temporarily stopped and the shield jack 18 is stopped.
To shrink. Then, the segment assembling device 22 assembles a new segment 2 into the space. When the assembling of the segment 2 over the entire circumference of the inner surface of the excavation pit is completed, the expansion jack 13 is contracted to separate the beam 4 from the segment 2, and then the traveling jack 21 is extended to extend the traveling jack 21 by a distance corresponding to one segment. The perfect circle holding device 3 is advanced. And
The extension jack 13 is extended so that the ground plates 6 of the upper and lower beams 4 are extended.
Is pressed and supported on the second segment 2 which is newly positioned from the face side, and then the shield machine 1 resumes the excavating operation.

Next, in the case where the inner diameter of the support structure by the second group of segments changes, the procedure of the radial position adjustment work for adjusting the radial position of the ground plate 6 of the adjuster 5 attached to the upper and lower beams 4. Will be described. First, the tightening nut 9 for fixing the radial position of the ground plate 6 is loosened. Next, by turning the handle 8, the position of the adjusting screw 7 in the radial direction is regulated by the regulating block 10, and the adjusting screw 7 moves in the radial direction. Turn the handle 8 until the position reaches the set position calculated in advance. At this time, since the pair of guide rods 12 provided at both ends on the circumferential direction of the ground plate 6 are loosely fitted in the guide holes 4a of the beam 4, the adjustment screw 7 is prevented from idling. When the adjustment of the radial position of the ground plate 6 is completed, the tightening nut 9 is tightened again to fix the radial position of the ground plate 6.

If the scale is marked along the longitudinal direction of the guide rod 12, the radial position of the ground plate 6 can be easily adjusted. Further, since the ground plate 6 is swingably connected to the adjusting screw 7 via the spherical joint 11, when the expansion jack 13 is extended to press the ground plate 6 of the beam 4 against the segment 2, Prevents the contact of the ground plate 6 with the segment 2 due to the radius difference between the circular arc surface of No. 4 and the inner peripheral circular surface of the new support structure, and the whole surface of the ground plate 6 can be pressed against the inner surface of the segment 2 at all times. It has become.

In the present embodiment, the support means for supporting the ground plate 6 so as to be movable in the radial direction includes an adjusting screw 7, a handle 8 screwed to the adjusting screw 7, and a regulating block 10 facing up and down the handle 8. The grounding plate 6
Can be adjusted steplessly, and the adjuster 5 can be made strong and simple. In addition, a large number of engagement grooves are provided along the longitudinal direction of a support column that supports the ground plate movably in the radial direction without using a screw mechanism for the support means of the ground plate, and fits into the engagement groove. It is also possible to use a stepwise movement support mechanism using a locking blade or the like that can be engaged with the actuator. Further, a plurality of adjusting screws of the outer diameter adjuster may be provided in the circumferential direction of the beam, and the ground plate may be supported by the plurality of adjusting screws. In this case, the means for preventing the ground plate from rotating by the guide rod or the like can be omitted.

[0015]

As described above, according to the present invention, since a plurality of adjusting means for adjusting the amount of movement of the installation plate in the radial direction are provided at predetermined intervals in the circumferential direction of the beam, the segment support is provided. Even if the inner diameter of the structure changes, the radial position of the grounding plate can be easily adjusted to a position in contact with the inner surface of the segment to be a desired perfect circle, and the segment supporting structure can be easily adjusted. It can be kept in a perfect circle.

[Brief description of the drawings]

FIG. 1 is a front view of a segment true circle holding device of a shield machine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a schematic configuration of a shield machine equipped with a segment perfect circle holding device according to an embodiment of the present invention.

FIG. 3 is a front view of an outer diameter adjuster provided at an outer edge of the perfect circle holding device.

FIG. 4 is a cross-sectional view of a main part of the perfect circle holding device, taken along section line XX in FIG. 3;

[Description of Signs] 1 Shield machine 2 Segment 3 Roundness holding device 4 Beam 4a Guide hole 5 Adjuster (adjustment means) 6 Ground plate 7 Adjustment screw 8 Handle 9 Tightening nut 10 Restriction block 11 Spherical joint 12 Guide rod 13 Expansion Jack 18 shield jack 19 gantry 20 traveling body 21 traveling jack 22 segment assembling device

Claims (3)

[Claims] 1. A plurality of ground plates disposed behind a shield machine and in contact with a segment assembled over the entire inner peripheral surface of the pit, and at least along an upper inner peripheral surface of the pit. A substantially arc-shaped beam that is provided so as to be movable in the radial direction and fixes and supports the plurality of ground plates, and an expansion jack that locks both ends of the beam and pushes and expands the beam in the radial direction. In a segment perfect circle holding device of a shield machine having a shield machine, a plurality of adjusting means for adjusting an amount of movement of the installation plate in the radial direction are provided at predetermined intervals in a circumferential direction of the beam. Segment roundness holding device for shield machine. 2. The adjusting means includes a rod-shaped adjusting screw having one end locked to the ground plate and having a threaded groove on a peripheral surface, a handle screwed to the adjusting screw and operable by hand, The device according to claim 1, further comprising a regulating member fixed to the beam to regulate a radial position of the handle. 3. The device according to claim 2, wherein the ground plate is rotatably connected to one end of the adjusting screw via a rotary joint.