Segment hanging jig and segment attitude change method

Abstract

To provide a segment hanging jig capable of efficiently changing an attitude of a segment in a short time.SOLUTION: A segment hanging jig 10 is formed of: fixing hardware 11 that is detachably installed on a vertical rib 37 extending in a vertical direction of a segment 33; a spring-type anti-detachment pin 12 that secures the fixing hardware 11 to the vertical rib to prevent the fixing hardware 11 from falling off the vertical rib 37; and a swivel eyebolt 13 that is installed on the fixing hardware 11 and connected to a crane. The fixing hardware has: hook plates 14a, 14b that extend in a width direction from the outside to the inside of the vertical rib 37 so as to surround the vertical rib 37 and hook onto the vertical rib 37; a pair of clamping plates 15a, 15b that extend in the width direction from the hooking plate 14b toward the opposite side and are located vertically above and below a segment hanger fitting 38 that extends in the width direction and is fixed to the vertical rib 37; and a support plate 16 that extends in the width direction from the hooking plate 14a toward the opposite side and is located vertically above the clamping plate 15a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a segment lifting jig for lifting a segment, and to a segment posture changing method for changing a segment from one of a lying posture and an upright posture to the other posture. [Background technology]

[0002] Shield segments are transported into the tunnel in a boat-like state, with multiple segment pieces stacked on top of each other with their vertical ribs extending horizontally and their concave surfaces facing up (in a lying position). They are also lifted by a crane and temporarily placed on the invert at the tunnel face in this boat-like state, and are then sequentially supplied to an erector for assembly during segment construction. A lifting tool for lifting the segments is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-255276 Summary of the Invention [Problem to be solved by the invention]

[0004] In cases where transporting segments in a boat-like state is difficult, such as when the tunnel is narrow or when transporting materials and equipment using double tracks inside the tunnel to improve transportation efficiency, the segments are transported in a vertically stacked state (upright position) with their longitudinal ribs extending vertically. In this case, when temporarily storing the segments transported to the invert, the vertically stacked segments must be lifted by a crane and then repositioned from the upright position to a lying position so that the longitudinal ribs extend horizontally. The process of changing the segment from an upright position to a lying position requires time and effort, including the attachment of a lifting jig to the segment for the crane hook to lift the segment, and the removal of the lifting jig from the segment after changing the segment's position, making it difficult to efficiently change the segment's position in a short time. Furthermore, there is always a risk of industrial accidents, such as the lifted segment falling from the crane or a worker being accidentally trapped between the segments.

[0005] An object of the present invention is to provide a segment hanging jig and a segment position changing method that can change the position of a segment with greater safety. Another object of the present invention is to provide a segment hanging jig and a segment position changing method that can change the position of a segment efficiently in a short time. [Means for solving the problem]

[0006] The first premise of the present invention for solving the above problem is a segment lifting jig that is detachably installed on a segment and lifts the segment.

[0007] The feature of the segment lifting jig of the present invention in the first premise is that the segment lifting jig is formed from fixed hardware that is detachably installed on vertical ribs extending in the vertical direction of the segment, anti-fall-out stoppers that fix the fixed hardware to the vertical ribs and prevent the fixed hardware from falling off the vertical ribs, and hanging members that are installed on the fixed hardware and connected to a predetermined hanging device, and the fixed hardware has a hook plate that extends in the width direction from the outside to the inside of the vertical rib to surround the vertical rib and is hooked onto the vertical rib, a pair of clamping plates that extend in the width direction from the hook plate toward the opposite side and are located vertically above and below the segment lifting handle fittings that extend in the width direction and are fixed to the vertical ribs, and a support plate that extends in the width direction from the hook plate toward the opposite side and is located vertically above the clamping plate.

[0008] An example of a segment hanging jig of the present invention is a hanging member which is a free-moving eyebolt attached to a support plate, extending vertically upward from the support plate, tilting 180° relative to the mounting surface, and having an eye which rotates 360° about the mounting axis; and the anti-fall-out stopper is a spring-type anti-fall-out pin which has a pin which is inserted into an insertion hole drilled in the clamping plate and into an insertion hole drilled in the segment hanging hand fitting of the vertical rib, and a coil spring which urges the pin vertically downward to keep the pin inserted into the insertion hole.

[0009] In another example of the segment hanging jig of the present invention, the hook plate is formed from an upper hook plate connected to the support plate and extending in the width direction from the outside of the vertical rib toward the inside, surrounding the vertical rib, and a lower hook plate located vertically below the upper hook plate, connected to the clamping plate and extending in the width direction from the outside of the vertical rib toward the inside, surrounding the vertical rib, and a pair of clamping plates are formed from an upper clamping plate located vertically above the segment hanging handle fittings and extending in the width direction, and a lower clamping plate located vertically below the segment hanging handle fittings and extending in the width direction.

[0010] In another example of the segment hanging jig of the present invention, the fixing hardware is installed at the longitudinal center of the longitudinal rib located in the widthwise center of the segment, approximately at the center of gravity of the segment.

[0011] The second premise of the present invention for solving the above problem is a segment posture change method that uses a segment lifting jig that is detachably installed on a segment to lift the segment, and changes the segment posture from one of a lying-down posture in which the vertical ribs of the segment extend horizontally to an upright posture in which the vertical ribs of the segment extend vertically to the other.

[0012] The feature of the segment position changing method of the present invention in the second premise is that the segment hanging jig comprises a hook plate that extends in the width direction from the outside of the vertical rib toward the inside so as to surround the vertical rib and hook onto the vertical rib, a clamping plate that extends in the width direction from the hooking plate toward the opposite side and vertically clamps the segment hanging handle fittings that extend in the width direction and are fixed to the vertical rib, a support plate that extends in the width direction from the hooking plate toward the opposite side and is located vertically above the clamping plate, and is detachably installed on the vertical rib, a free eyebolt that is attached to the support plate and extends vertically upward from the support plate, and has an eye that rises 180° relative to the attachment surface and rotates 360° relative to the attachment axis, and a clamping plate that extends in the width direction from the hooking plate toward the opposite side and vertically clamps the segment hanging handle fittings that extend in the width direction and are fixed to the vertical rib, and a free eyebolt that is attached to the support plate and extends vertically upward from the support plate, and has an eye that rises 180° relative to the attachment surface and rotates 360° relative to the attachment axis, and a free eyebolt that extends vertically from the support plate and ... and a spring-type anti-fall-off pin having a pin that is inserted into a through-hole drilled in the segment and into a through-hole drilled in the segment hanging handle fitting of the vertical rib, and a coil spring that urges the pin vertically downward to maintain the state in which the pin is inserted into the insertion hole. The segment posture change method includes a fixing hardware installation step of hooking the hook plate of the fixing hardware onto the vertical rib of the segment and inserting the pin of the spring-type anti-fall-off pin into the insertion hole to install and fix the fixing hardware to the vertical rib; a segment lifting step of hanging the hook of a crane on the eye of the swivel eye bolt and then lifting the segment using the crane; and a posture change step of changing the lifted segment from one of a lying posture and an upright posture to the other using the swivel eye bolt. [Effects of the Invention]

[0013] The segment lifting jig according to the present invention can be used to lift a segment and easily change the segment from one of a lying position and an upright position to the other, allowing the position of the segment to be changed efficiently in a short time. The segment lifting jig can safely and easily change the position of the segment while preventing work-related accidents such as the segment falling or a worker being accidentally trapped by the segment.

[0014] According to the segment position changing method of the present invention, the hook plate of the fixing hardware is hooked onto the vertical rib of the segment, the pin of the spring-type drop-out prevention pin is inserted into the insertion hole to install and fix the fixing hardware to the vertical rib, the hook of the crane is hung on the eye of the universal eyebolt, and then the segment is lifted using the crane and the lifted segment is changed from one of the lying-down position and the upright position to the other using the universal eyebolt, so that the segment can be easily changed from one of the lying-down position and the upright position to the other and the position of the segment can be changed efficiently in a short time. By lifting the segment using a segment lifting jig, the segment position can be changed safely and easily while preventing work-related accidents such as the lifted segment falling or a worker being inadvertently trapped by the segment. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a front view of an example of a segment hanging jig. [Figure 2] FIG. 10 is a perspective view of the segment lifting jig installed on the segment. [Figure 3] Figure 2. Top view. [Figure 4] Cross-sectional view taken along line AA in Figure 1. [Figure 5] A cross-sectional view similar to Figure 4, but without the segment hanging jig installed. [Figure 6]A diagram showing the operation of the spring-type anti-fall pin (anti-fall stopper). [Figure 7] A diagram showing the operation of the spring-type anti-fall pin (anti-fall stopper). [Figure 8] 10A and 10B are diagrams illustrating changes in the posture of a segment. [Figure 9] 10A and 10B are diagrams illustrating changes in the posture of a segment. DETAILED DESCRIPTION OF THE INVENTION

[0016] The segment hanging jig 10 and segment posture changing method according to the present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 is a front view of an example of the segment hanging jig 10. In Fig. 1, the vertical direction is indicated by arrow X, and the width direction is indicated by arrow Y.

[0017] The segment lifting jig 10 is detachably attached to the vertical rib 37 of the segment 33 and is hooked onto a hook 40 of a crane (not shown) to lift the segment 33 and change its position. The segment lifting jig 10 is made up of a fixing hardware 11, a spring-type anti-fall pin 12 (anti-fall stopper), and a swivel eyebolt 13 (hanging member). The fixing hardware 11 is made of steel. The fixing hardware 11 has a pair of hook plates 14a, 14b, a pair of clamping plates 15a, 15b, and a support plate 16. These plates 14a, 14b, 15a, 15b, and 16 are integrally molded.

[0018] These hook plates 14a, 14b are formed from an upper hook plate 14a connected to the support plate 16 and a lower hook plate 14b connected to the clamping plate 15b. The upper hook plate 14a is formed in a key plate shape of a predetermined thickness that extends outward in the width direction from the support plate 16 and then folds back in the width direction toward the support plate 16. When the segment hanging jig 10 is installed on the vertical rib 37 of the segment 33, the upper hook plate 14a wraps around from the outside (outer peripheral surface) of the vertical rib 37 of the segment 33 to the inside (inner peripheral surface), extends in the width direction to surround the vertical rib 37, and hooks onto the vertical rib 37.

[0019] The lower hook plate 14b has the same shape and size as the upper hook plate 14a, is located vertically below (directly below) the upper hook plate 14a, and is shaped like a key plate of a predetermined thickness that bends back in the width direction toward the clamping plate 15b as it extends widthwise outward from the clamping plate 15b. When the segment hanging jig 10 is installed on the vertical rib 37 of the segment 33, the lower hook plate 14b wraps around from the outside (outer peripheral surface) of the vertical rib 37 of the segment 33 to the inside (inner peripheral surface), extends in the width direction to surround the vertical rib 37, and hooks onto the vertical rib 37. A first connecting plate 17a, which is shaped like a plate and extends vertically, is installed between the upper hook plate 14a and the lower hook plate 14b. The first connecting plate 17a has its upper end fixed (welded) to the underside of the upper hook plate 14a, making it one piece with the upper hook plate 14a, and its lower end fixed (welded) to the upper surface of the lower hook plate 14b, making it one piece with the lower hook plate 14b.

[0020] These clamping plates 15a, 15b are formed by an upper clamping plate 15a of a predetermined thickness extending in the width direction on the side of the upper surface of the segment hanging handle fitting 38 attached to the vertical rib 37 of the segment 33, and a lower clamping plate 15b of a predetermined thickness located vertically below (directly below) the upper clamping plate 14a and extending in the width direction parallel to the upper clamping plate 15a on the side of the underside of the segment hanging handle fitting 38 attached to the vertical rib 37. A plate-like second connecting plate 17b extending vertically is installed between these clamping plates 15a, 15b and the support plate 16. The upper end of the second connecting plate 17b is fixed (welded) to the underside of the support plate 16, making it one piece with the support plate 16, and the lower end is fixed (welded) to the upper surface of the lower clamping plate 15b, making it one piece with the lower clamping plate 15b.

[0021] The upper clamping plate 15a has its widthwise inner end fixed (welded) to the second support column 17b, making it one piece with the second support column 17b. A space 18 is formed between the upper clamping plate 15a and the lower clamping plate 15b, allowing the segmented hanging handle fittings 38 attached to the vertical ribs 37 to enter. The upper clamping plate 15a and the lower clamping plate 15b are drilled (formed) with through holes 19a, 19b of the same shape and size that penetrate the plates 15a, 15b in the vertical direction. The diameter of the through hole 19a in the upper clamping plate 15a is larger than the diameter of the cylinder 21 of the spring-type fall-off prevention pin 12, and the diameter of the through hole 19b in the lower clamping plate 15b is smaller than the diameter of the cylinder 21 of the spring-type fall-off prevention pin 12 and larger than the diameter of the lower half portion 26 of the pin 22 of the spring-type fall-off prevention pin 12.

[0022] The support plate 16 is fixed (welded) to the upper hook plate 14a and is integral with the upper hook plate 14a. The support plate 16 extends widthwise from the upper hook plate 14a toward the opposite side. The support plate 16 is located vertically above the upper clamp plate 15a. A bolt hole 20a and a through hole 20b are formed in the support plate 16, passing through it vertically. A female thread is formed in the bolt hole 20a, and the bolt portion 31 of the universal eyebolt 13 (hanging member) is screwed into the bolt hole 20a.

[0023] The spring-type anti-fall-out pin 12 described above is used for the anti-fall-out stopper. It should be noted that a bolt-type or anti-slip pin-type stopper can also be used. The spring-type anti-fall-out pin 12 is formed of a cylinder 21, a pin 22, a coil spring 23, and a handle 24 (eyebolt). The cylinder 21 is made of steel and shaped like a long cylinder extending vertically. The cylinder 21 is inserted through the through-hole 20b of the support plate 16 and through the through-hole 19a of the upper clamping plate 15a. The outer circumferential surface of the cylinder 21 is fixed (welded) to the inner circumferential surface of the support plate 16 surrounding the through-hole 20b, and is also fixed to the inner circumferential surface of the upper clamping plate 15a surrounding the through-hole 19a, and is connected to the fixing hardware 11.

[0024] The pin 22 is made of steel and is formed into a cylindrical shape that is long in the vertical direction. The pin 22 is housed inside the cylinder 21 and slides vertically upward and downward inside the cylinder 21. The pin 22 has an upper half portion 25 whose diameter is slightly smaller than the inner diameter of the cylinder 21, and a lower half portion 26 whose diameter is approximately the same as the inner diameter of the cylinder 21.

[0025] The top of the pin 22 is formed with a bolt hole 27 extending vertically and a flange 28 extending radially outward. A female thread is formed in the bolt hole 27, and a bolt portion 29 of the handle 24 (eyebolt) is screwed into the bolt hole 27. The flange 28 is formed in a disk shape extending radially outward from the pin 22. The flange 28 abuts against the top of the cylinder 21.

[0026] The coil spring 23 is housed inside the cylinder 21. An upper half portion 25 of the pin 22 is inserted into the coil spring 23. The top of the coil spring 23 abuts against the top surface of the cylinder 21, and the bottom of the coil spring 23 abuts against the top surface of a lower half portion 26 of the pin 22. The coil spring 23 biases the pin 22 vertically downward. The handle 24 (eyebolt) is formed from an annular gripping portion 30 and a bolt portion 29 extending vertically downward from the gripping portion 30. The bolt portion 29 of the handle 24 (eyebolt) is threaded into a bolt hole 27 at the top of the pin 22. The swivel eyebolt 13 described above is used for the hanging member. The swivel eyebolt 13 has a bolt portion 31 and an annular eye 32. The swivel eyebolt 13 is installed and fixed to the support plate 16 by having its bolt portion 31 screwed into a bolt hole 20a formed in the support plate 16. The eye 32 of the swivel eyebolt 13 can tilt 180° relative to the upper surface (mounting surface) of the support plate 16 and rotate 360° relative to the bolt portion 31 (mounting axis).

[0027] FIG. 2 is a perspective view of the segment hanging jig 10 installed on the segment 33, and FIG. 3 is a top view of FIG. 2. FIG. 4 is a cross-sectional view taken along line AA in FIG. 1. FIG. 5 is a cross-sectional view similar to FIG. 4 with the segment hanging jig 10 not installed. FIGS. 6 and 7 are diagrams illustrating the operation of the spring-type drop-prevention pin 12 (drop-prevention stopper). FIG. 6 shows a state in which the pin 22 of the spring-type drop-prevention pin 12 is engaged with (inserted through) the through-holes 19a, 19b, and 20b of the clamping plates 15a and 15b and the support plate 16, and the through-hole 39 of the segment hanging lug 38. FIG. 7 shows a state in which the pin 22 of the spring-type drop-prevention pin 12 has been removed from the through-holes 19a and 19b of the clamping plates 15a and 15b and the through-hole 39 of the segment hanging lug 38.

[0028] The segment 33 (shield segment) on which the segment lifting jig 10 is installed is made of steel. As shown in Figures 1 and 2, one example of the segment 33 is formed from a skin plate 34 of a predetermined area that curves in the width direction, main girders 35 that rise vertically from both end edges of the skin plate 34, joint plates 36 that rise vertically from both side edges of the skin plate 34, three vertical ribs 37 that are located between the main girders 35 and extend in the vertical direction, and segment lifting hand fittings 38 that are attached to the vertical ribs 37.

[0029] The vertical rib 37 is formed with an L-shaped cross section, with its upper and lower end edges fixed (welded) to the main girder 35, and its fixed side edge (one side edge) fixed (welded) to the skin plate 34. The segment hanger fitting 38 is formed in a substantially rectangular plate shape, and as shown in FIG. 4, is disposed on the vertical rib 37 that is located in the center of the width of the vertical ribs 37, at the vertical center of the vertical rib 37 (approximately the center of gravity of the segment 33), with the side edges of the segment hanger fitting 38 fixed (welded) to the skin plate 34 and the vertical rib 37. A through hole 39 is drilled (formed) in approximately the center of the segment hanger fitting 38, penetrating it. The diameter of the through hole 39 is smaller than the diameter of the cylinder 21 of the spring-type fall-off prevention pin 12, and larger than the diameter of the lower half portion 26 of the pin 22 of the spring-type fall-off prevention pin 12.

[0030] An example of the procedure for installing the segment lifting jig 10 on the segment 33 is as follows. After hooking the upper hook plate 14a and the lower hook plate 15a of the segment lifting jig 10 onto the other side edge of the vertical rib 37 located in the center in the width direction, the fixing hardware 11 is rotated widthwise toward the segment lifting hand bracket 38. Next, the handle 24 (eye bolt) of the spring-type fall-out prevention pin 12 is grasped, and a pulling force is applied vertically upward to the handle 24, and the handle 24 is pulled vertically upward as shown by arrow X1 in Figure 7 against the biasing force of the coil spring 23. When the handle 24 is pulled up, the pin 22 slides inside the cylinder 21, and as shown in Figure 7, the pin 22 is pulled vertically upward, and the upper half 25 of the pin 22 is exposed vertically upward from the cylinder 21.

[0031] With the upper half 25 of the pin 22 exposed from the cylinder 21, the fixing hardware 11 is further rotated widthwise toward the segment hanger fitting 38, and the segment hanger fitting 38 is inserted into the space 18 between the upper clamping plate 15a and the lower clamping plate 15b. After the segment hanger fitting 38 has inserted into the space 18, the pulling force applied to the handle 24 is released. When the pulling force is released, the biasing force of the coil spring 23 presses the pin 22 of the spring-type fall-out prevention pin 12 downward in the vertical direction as shown by the arrow X2 in Figure 6, and the pin 22 enters the through-hole 39 of the segment hanger fitting 38 and also enters the through-holes 19a, 19b of the upper clamping plate 15a and the lower clamping plate 15b.

[0032] The spring force of the coil spring 23 causes the pin 22 of the spring-type anti-fall pin 12 to enter the through hole 39 of the segment hanging handle fitting 38 and the through holes 19a, 19b of the clamping plates 15a, 15b, and the spring-type anti-fall pin 12 installs and fixes the segment hanging jig 10 to the segment 33 (vertical rib 37, segment hanging handle fitting 38). When the segment lifting jig 10 is installed and fixed to the segment 33, the segment lifting hand fitting 38 enters the space 18 between the upper clamping plate 15a and the lower clamping plate 15b, and the pin 22 of the spring-type anti-fall-off pin 12 enters the through holes 19a, 19b, and 39 of the segment lifting hand fitting 38 and the clamping plates 15a and 15b, and as shown in Figure 5, the upper hook plate 14a and the lower hook plate 4b hook onto the free side edge (other side edge) of the vertical rib 37, and the segment lifting jig 10 is firmly fixed to the segment 33.

[0033] To remove the segment lifting jig 10 from the segment 33, the handle 24 (eyebolt) of the spring-type anti-fall-out pin 12 is grasped and the handle 24 is pulled vertically upward against the biasing force of the coil spring 23, and the pin 22 of the spring-type anti-fall-out pin 12 is pulled out from the clamping plates 15a and 15b and the through holes 19a, 19b, and 39 of the segment lifting hand fitting 38. After the pin 22 has been pulled out from the through holes 19a, 19b, and 39, the fixing hardware 11 is rotated widthwise so as to move away from the segment lifting hand fitting 38, and the segment lifting hand fitting 38 is moved away from the space 18 between the upper clamping plate 15a and the lower clamping plate 15b. At the same time, the upper hook plate 14a and the lower hook plate 14b are released from the free side edge (other side edge) of the vertical rib 37, and the fixing hardware 11 is removed from the vertical rib 37 of the segment 33.

[0034] The segment lifting jig 10 is constructed by pulling the handle 24 vertically upward against the force of the coil spring 23, inserting the segment lifting handle 38 into the space 18 between the upper clamping plate 15a and the lower clamping plate 15b, and then using the force of the coil spring 23 to insert the pin 22 of the spring-type anti-fall pin 12 into the clamping plates 15a, 15b and the through holes 15a, 15b, 39 of the segment lifting handle 38. This firmly fixes the segment lifting jig 10 to the vertical rib 37 of the segment 33, and does not require much effort or time to install the segment lifting jig 10 on the vertical rib 37 of the segment 33, allowing the segment lifting jig 10 to be easily and quickly attached to the vertical rib 37.

[0035] The segment lifting jig 10 uses a spring-loaded anti-fall pin 12 to secure it to the vertical rib 37 of the segment 33, so the segment lifting jig 10 can be installed on the vertical rib 37 with a single touch by simply pulling the pin 22 vertically upward against the biasing force of the coil spring 23 and then moving the pin 22 vertically downward using the biasing force of the coil spring 23.This eliminates the need to install bolts in the bolt holes or rotate the bolt heads, and allows the installation of the segment lifting jig 10 on the vertical rib 37 of the segment 33 even in a narrow tunnel.

[0036] Furthermore, if the pin 22 of the spring-type anti-fall pin 12 is not properly inserted into the through holes 19a, 19b of the clamping plates 15a, 15b and the through hole 39 of the segment hanging handle fittings 38, the exposed area of ​​the pin 22 from the cylinder 21 will be large, making it easier to visually check the attachment and detachment status of the spring-type anti-fall pin 12 and improving the reliability of the work.

[0037] 8 and 9 are diagrams for explaining a change in the posture of the segment 33. Fig. 8 shows a lying posture of the segment 33 in which the vertical ribs 37 of the segment 33 lie horizontally, and Fig. 9 shows an upright posture of the segment 33 in which the vertical ribs 37 of the segment 33 stand up vertically. An example of the procedure for changing the lying posture of the segment 33 in which the vertical ribs 37 lie horizontally to the upright posture of the segment 33 in which the vertical ribs 37 stand up vertically is as follows.

[0038] Of the multiple segments 33 stacked in a boat while in a lying position, a segment lifting jig 10 is installed on the vertical rib 37 of the segment 33 located at the top (fixing hardware installation process). The procedure for installing the segment lifting jig 10 on the vertical rib 37 of the segment 33 is as described above. Next, after the hook 40 of the crane is hung on the eye 32 of the swivel eyebolt 14 of the segment lifting jig 10, the segment 33 stacked in a boat is lifted upward from the ground together with the segment lifting jig 10 using a crane, as shown by arrow X1 in Figure 8 (segment lifting process).

[0039] When the segment 33 is lifted, the eye 32 of the swivel eyebolt 13 rises 90° relative to the upper surface (mounting surface) of the support plate 16, and the segment 33 is lifted by the crane in the lying position. In this state, a worker grasps the corner where the main girder 35 of the segment 33, located below the segment lifting jig 10, intersects with the joint plate 36, or grasps the corner where the main girder 25 of the segment 22, located above the segment lifting jig 10, intersects with the joint plate 36, and rotates the lying position of the segment 33 by 90° as shown by arrow L1 in Figure 8, changing the position of the segment 33 to an upright position with the vertical rib 37 standing vertically (position change process). When the segment 33 is changed to an upright position, the eye 32 of the swivel eyebolt 13, which rose 90° relative to the upper surface (mounting surface) of the support plate 16, falls relative to the upper surface (mounting surface) of the support plate 16, as shown in Figure 9.

[0040] After changing the segment 33 from a lying position to an upright position, the segment 33 lifted by the crane is lowered toward the ground, and the same process is repeated in sequence to change the position of the multiple segments 33 from a lying position to an upright position, and the upright segments 33 are stacked horizontally to vertically stack the segments 33 that were stacked in a boat-like state.

[0041] An example of the procedure for changing the segment 33 from an upright position to a lying position is as follows: A segment lifting jig 10 is installed on the vertical rib 37 of the innermost segment 33 of the multiple segments 33 that are stacked vertically while still in the upright position (fixing hardware installation process). Next, a crane hook 40 is hung on the eye 32 of the swivel eyebolt 13 of the segment lifting jig 10, and then the vertically stacked segments 33 together with the segment lifting jig 10 are lifted upward from the ground using a crane, as shown by arrow X1 in Figure 9 (segment lifting process).

[0042] When the segment 33 is lifted, the eye 32 of the swivel eyebolt 13 is tilted downward relative to the upper surface (mounting surface) of the support plate 16, and the segment 33 is lifted by the crane in an upright position. In this state, a worker grasps the corner where the main girder 35 and joint plate 36 of the segment 33, which is located below the segment lifting jig 10, intersect, or grasps the corner where the main girder 35 and joint plate 36 of the segment 33, which is located above the segment lifting jig 10, intersect, and rotates the upright position of the segment 33 by 90° as shown by arrow L2 in Figure 9, changing the position of the segment 33 to a lying position in which the vertical rib 37 is horizontally laid (position change process). When the segment 33 is changed to a lying position, the eye 32 of the swivel eyebolt 13, which was tilted downward relative to the upper surface (mounting surface) of the support plate 16, stands up at an angle of 90° relative to the upper surface (mounting surface) of the support plate 16, as shown in Figure 8.

[0043] After changing the segment 33 from an upright position to a lying position, the segment 33 lifted by the crane is lowered to the ground, and the same process is repeated in sequence to change the position of the plurality of segments 33 from an upright position to a lying position, and the lying-positioned segments 33 are stacked vertically so that the segments 33 that were stacked vertically are loaded into a boat-like state.

[0044] The segment lifting jig 10 has a crane hook 40 attached to the eye 32 of its universal eyebolt 13, and the crane is used to lift the segment 33 upward from the ground, allowing the segment 33 to be easily changed from a lying position to an upright position, or vice versa, thereby efficiently changing the position of the segment 33 in a short time. The segment lifting jig 10 can safely and easily change the segment 33 from a lying position to an upright position or from an upright position to a lying position while preventing work-related accidents such as the lifted segment 33 falling or a worker being inadvertently caught in the segment 33.

[0045] The segment posture change method involves hooking the hook plates 14a, 14b of the fixing hardware 11 onto the vertical ribs 37 of the segment 33, inserting the pin 22 of the spring-type anti-fall-off pin 12 into the insertion holes 19a, 19b, 39 to install and fix the fixing hardware 11 to the vertical ribs 37, hanging the crane hook 40 on the eye 32 of the adjustable eyebolt 13, and then using the crane to lift the segment 33, and using the adjustable eyebolt 13 to change the lifted segment 33 from a lying-down position to an upright position or from an upright position to a lying-down position.Therefore, the segment 33 can be easily changed from a lying-down position to an upright position or from an upright position to a lying-down position, and the posture of the segment 33 can be changed efficiently in a short time even inside a narrow tunnel. The segment posture changing method involves lifting the segment 33 using the segment lifting jig 10, which can safely and easily change the segment 33 from a lying position to an upright position or from an upright position to a lying position while preventing work-related accidents such as the lifted segment 33 falling or a worker being accidentally caught in the segment 33. [Explanation of symbols]

[0046] 10 Segment Lifting Jig 11 Fixing hardware 12 Spring-type anti-fall pin (anti-fall stopper) 13 Free-hanging eye bolt (hanging member) 14a Upper hook plate 14b Lower hook plate 15a Upper clamping plate 15b Lower clamping plate 16 Support Plate 17a 1st connection plate 17b 2nd connecting plate 18 spaces 19a Through hole 19b Through hole 20a Bolt hole 20b Through hole 21 cylinders 22-pin 23 Coil spring 24 Handle (eye bolt) 25 Upper part 26 Lower half part 27 bolt holes 28 flange 29 Bolt section 30 Gripping part 31 Bolt part 32 Eye 33 segments 34 Skin Plate 35 Main girder 36 Joint plate 37 Vertical rib 38 Segment Hanging Handle 39 Through Hole 40 Hook

Claims

1. A segment lifting jig that is detachably installed on a segment and lifts the segment, The segment lifting jig is formed from a fixing hardware that is detachably installed on a vertical rib extending in the vertical direction of the segment, a drop-off prevention stopper that fixes the fixing hardware to the vertical rib and prevents the fixing hardware from dropping off from the vertical rib, and a hanging member that is installed on the fixing hardware and connected to a predetermined hanging device, A segment hanging jig characterized in that the fixed hardware has a hook plate that extends widthwise from the outside to the inside of the vertical rib to surround the vertical rib and hooks onto the vertical rib, and a pair of clamping plates that extend widthwise from the hook plate to the opposite side and are located vertically above and below the segment hanging handle hardware that extends widthwise and is fixed to the vertical rib.

2. The segment hanging jig described in claim 1, wherein the hanging member is a free-moving eye bolt having an eye that can be raised or lowered 180 degrees relative to the mounting surface and rotates 360 degrees relative to the mounting axis, and the anti-fall-off stopper is a spring-type anti-fall-off pin that has a pin that is inserted into an insertion hole drilled in the clamping plate and into an insertion hole drilled in the segment hanging hand fitting of the vertical rib, and a coil spring that urges the pin vertically downward to maintain the pin inserted into the insertion hole.

3. The segment hanging jig described in claim 1 or claim 2, wherein the hook plate is formed from an upper hook plate extending in the width direction from the outside of the vertical rib toward the inside to surround the vertical rib, and a lower hook plate located vertically below the upper hook plate, connected to the clamping plate, and extending in the width direction from the outside of the vertical rib toward the inside to surround the vertical rib, and the pair of clamping plates is formed from an upper clamping plate located vertically above the segment hanging handle fitting and extending in the width direction, and a lower clamping plate located vertically below the segment hanging handle fitting and extending in the width direction.

4. 4. A segment hanging jig according to claim 1, wherein the fixing hardware is installed at the longitudinal center of a longitudinal rib located at the widthwise center of the segment, approximately at the center of gravity of the segment.

5. A segment posture changing method for changing a segment posture from one of a lying posture of the segment in which the longitudinal ribs of the segment extend horizontally and an upright posture of the segment in which the longitudinal ribs of the segment extend vertically to the other posture by using a segment lifting jig that is detachably installed on the segment and lifts the segment, comprising: the segment hanging jig is formed from a fixed hardware that is detachably installed on the vertical rib and includes a hook plate that extends widthwise from the outside of the vertical rib toward the inside so as to surround the vertical rib and hook onto the vertical rib, and a clamp plate that extends widthwise from the hook plate toward the opposite side and vertically clamps the segment hanging handle fittings that extend widthwise and are fixed to the vertical rib; a free-standing eyebolt that is tilted 180° relative to the mounting surface and has an eye that rotates 360° about the mounting axis; a pin that is inserted into an insertion hole drilled in the clamp plate and inserted into an insertion hole drilled in the segment hanging handle fittings of the vertical rib; and a spring-type anti-detachment pin that includes a coil spring that urges the pin vertically downward to maintain the pin inserted into the insertion hole, The segment posture change method is characterized by comprising: a fixing hardware installation process in which the hook plate of the fixing hardware is hooked onto the vertical rib of the segment and the pin of the spring-type anti-fall-out pin is inserted into the insertion hole to install and fix the fixing hardware to the vertical rib; a segment lifting process in which a crane hook is hung on the eye of the universal eye bolt and then the segment is lifted using the crane; and a posture change process in which the lifted segment is changed from one of the lying posture and the upright posture to the other using the universal eye bolt.

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