Method for fixing hinge plate in concrete formwork device and fixture device for fixing hinge plate

Abstract

To enable highly accurate positioning of a reinforcing member and a hinge plate having a hinge hole.SOLUTION: A reinforcing member has an angled cross section. A hinge plate 17 having a hinge hole 16 is fixed to a side of the reinforcing member. With the reinforcing member positioned relative to a reference plate 40, the hinge plate 17 is placed on a side of the reference plate 40. Then, a reference pin 41 is inserted into a reference hole 38 of the reference plate 40 and a hinge hole 16 of the hinge plate 17. A slope 47 is formed on the outer periphery of the reference pin 41 to align the hinge hole 16 with the reference hole 38. With the hinge hole 16 aligned with the reference hole 38, the hinge plate 17 is welded to the reinforcing member.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a method for fixing a hinge plate having a hinge hole to a base material in a concrete formwork device for forming a tunnel lining concrete, and to a jig device for fixing the hinge plate. [Background technology]

[0002] As shown in Figures 1 and 2, the lining concrete C on the inner periphery of tunnel T is formed by a concrete formwork device (hereinafter simply referred to as formwork device) 11. This formwork device 11 has a steel form unit 12 consisting of multiple forms connected together, and the lining concrete C is formed by this form unit 12. The form unit 12 has a roughly arch curve shape overall. The form unit 12 consists of a top form 12a located at the top, side forms 12b at the lower ends of the top form 12a, and an invert form 12c below that.

[0003] These forms 12a, 12b, and 12c have the configurations shown in Figs. 3 to 6. That is, each of the forms 12a, 12b, and 12c has a skin plate 14 on the outer periphery that constitutes the molding surface of the lining concrete C. Then, reinforcing members 13 bent into an angled cross section are fixed to both ends of the back surface, which is the inner periphery of the skin plate 14, in order to reinforce the entire forms 12a, 12b, and 12c. Side plates 15 are fixed to both width ends on the back surface side of the skin plate 14. Hinge plates 17 and 18 having hinge holes 16 are fixed by welding to two places on the left and right ends of the reinforcing member 13. Then, the adjacent forms 12a, 12b, and 12c are rotatably connected by a hinge shaft 19 passing through the hinge hole 16. The hinge plates 17 on one end of the mutually connected forms 12a, 12b, 12c are provided at the left and right positions, and two hinge plates 18 on the other end are provided at the left and right positions, and one hinge plate 17 is sandwiched between two hinge plates 18. The hinge plates 17, 18 are not only provided at both left and right ends, but also may be provided at a middle position in the left and right direction in addition to both left and right ends when the left and right length of the reinforcing member 13 is long.

[0004] As shown in Fig. 3 and Fig. 4, the upward end of the skin plate 14 of the form 12a, 12b, 12c protrudes from the width end of the reinforcing member 13. The downward end of the skin plate 14 is recessed from the width end of the reinforcing member 13. Then, in the state where the form unit 12 for molding the lining concrete C is constructed, the end faces of the width end of the skin plate 14 of the adjacent forms 12a, 12b, 12c are in a butt abutting state. At this time, the concrete molding surfaces, which are the surfaces of the skin plates 14 of the adjacent forms 12a, 12b, 12c, are continuous to form a continuous curved surface at the butt joint, and the space between the ends of both skin plates 14 is blocked by the reinforcing member 13. Therefore, no step or the like is formed in the lining concrete C at the butt joint of the adjacent skin plates 14, and the lining concrete C is formed smoothly.

[0005] However, the reinforcing member 13 may be distorted or curved, or the bending accuracy of the bent portion of the reinforcing member 13 may be uneven. In such cases, it is often impossible to maintain the positional accuracy of the hinge plates 17, 18 fixed to the reinforcing member 13. If the hinge shaft 19 is passed through the hinge hole 16 when the positional accuracy of the hinge plates 17, 18 is poor, this often results in the molding surface of the skin plate 14 not being continuous with the same surface. In such cases, steps or the like may be generated on the molding surface of the lining concrete C, degrading the finishing quality of the molding surface.

[0006] Patent Document 1 discloses a technique for solving the above problems. In this patent document 1, the reinforcing member 13 is positioned relative to a jig (not shown). The hinge holes 16 of the hinge plates 17, 18 are fitted onto the reference pins inserted into the reference holes of the jig. In other words, the positional accuracy of the hinge plates 17, 18 relative to the reference holes is maintained by aligning the hinge holes 16 of the hinge plates 17, 18 with the reference pins inserted into the reference holes of the jig. Then, the hinge plates 17, 18 with the positional accuracy maintained are welded and fixed to the reinforcing member 13 positioned relative to the reference holes. In addition, when the hinge plates 17, 18 are supported by the reference pins, the outer peripheral edges of the hinge plates 17, 18 face the reinforcing member 13 with a small gap therebetween, and the welding filler material is provided to fill the gap.

[0007] In Patent Document 1, it is said that the positional relationship between hinge hole 16 and reinforcing member 13 is maintained with high precision by using the reference hole as a reference in the above manner. As a result, it becomes possible to dispose skin plate 14 fixed to reinforcing member 13 in a fixed position with respect to hinge hole 16. As a result, no steps or the like are generated between skin plates 14 of adjacent foam units 12, so that the molding surfaces of skin plate 14 are continuous and flush with each other. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2017-75501 A Summary of the Invention [Problem to be solved by the invention]

[0009] However, the conventional technique of Patent Document 1 has the following problems. That is, it is difficult to form hinge holes 16 of a predetermined shape in the hinge plates 17 and 18 with high accuracy. Therefore, gaps of various sizes are formed between the reference pin and each hinge hole 16. When aligning the reference pin with the hinge hole 16, the hinge plates 17 and 18 are often positioned below the reference pin by their own weights by the amount of the uneven gaps. That is, the hinge plates 17 and 18 are positioned in various positions offset by the amount of the uneven gaps and welded to the reinforcing member 13.

[0010] As a result, the hinge shaft 19 inserted into the hinge hole may deviate from the specified position. As shown in Fig. 7(a) and Fig. 7(c), when the hinge shaft 19 deviates from the specified position, a step or gap occurs between the ends of the skin plates 14 of the adjacent forms 12a, 12b, and 12c. In such a situation, for example, as shown by the two-dot chain line in Fig. 7(a), the ends of the skin plates 14 are pressed against each other and the ends protrude upward. Alternatively, as shown in Fig. 7(c), a gap occurs between the ends of the skin plates 14. For this reason, as shown in Fig. 7(b) and Fig. 7(d), there is a high possibility that a step Ca or a protruding streak Cb will be formed on the surface of the lining concrete C in the portion between the ends of the adjacent skin plates 14. This leads to a decrease in the finishing quality of the lining concrete C, which is required to be smooth.

[0011] As shown in FIG. 8, after the lining concrete C is formed, the form unit 12 needs to be removed from the forming position. In this removal, the side form 12b and the invert form 12c are rotated inward around the hinge shaft 19, and the entire form unit 12 is lowered. In this case, if the steps Ca and streaks Cb shown in FIG. 7(b) and FIG. 7(d) are formed on the concrete forming surface, the steps Ca and streaks Cb are scraped off by the end of the skin plate 14 of the top form 12a, in particular, when the form unit 12 is lowered. Then, the concrete forming surface continuing below the scraped steps Ca and streaks Cb is peeled off, including the scraped steps Ca and streaks Cb. As a result, defects larger than the steps Ca and streaks Cb are generated on the forming surface of the lining concrete C, and the finished quality of the lining concrete C is significantly reduced. [Means for solving the problem]

[0012] In the method of fixing a hinge plate in a concrete formwork apparatus of the present invention, a plate-shaped base material used in a concrete formwork apparatus for forming a tunnel lining concrete and a hinge plate which is fixed to the side of the base material and has a hinge hole are positioned using a jig to fix the base material and the hinge plate, the method includes positioning the base material with respect to a reference hole of a reference member provided on the jig, placing the hinge plate on the side of the reference member in this state, inserting a reference pin into the hinge hole and the reference hole, and engaging the sloped surface formed on the outer periphery of the reference pin with the periphery of the hinge hole to position the hinge plate with respect to the reference hole, and then welding the outer periphery of the hinge plate to the base material.

[0013] In addition, in the jig device for fixing a hinge plate in a concrete formwork apparatus of the present invention, a concrete formwork apparatus for forming a tunnel lining concrete comprises an apparatus stand and a jig provided on the apparatus stand, the jig having a positioning surface located on a plane perpendicular to the top surface of the apparatus stand and a side surface above the positioning surface and perpendicular to the top surface of the apparatus stand, a reference member having a reference hole located on an axis parallel to the top surface of the apparatus stand, and a reference pin to be inserted into the reference hole, and a slope is formed on the outer periphery of the reference pin so that it can engage with the periphery of the hinge hole of a hinge plate superimposed on the side surface of the reference member.

[0014] Therefore, in the present invention, the hinge hole of the hinge plate is positioned in a state of being centered with respect to the reference hole of the jig by the action of the inclined surface. Therefore, if the base material is positioned with respect to the reference hole, the hinge hole and the base material can be accurately positioned. In the present invention, the base material is used as a reinforcing member for reinforcing a form having, for example, a skin plate of a concrete formwork device. In this case, when adjacent forms are connected with a hinge shaft at the hinge hole, the positional relationship between the hinge hole and the reinforcing member is accurate, so that adjacent skin plates can be joined without any gap or step between them. Therefore, the skin plate can finish the lining concrete with high finishing quality. Effect of the Invention

[0015] According to the present invention, when forming tunnel lining concrete, the finishing quality can be improved. [Brief description of the drawings]

[0016] [Figure 1] FIG. 3 is a cross-sectional view showing a concrete formwork device in use. [Diagram 2] Side view of concrete formwork device. [Diagram 3] Cross-sectional view of the hinge portion connecting the forms. [Figure 4]This is an exploded cross-sectional view of the hinge part that connects the forms. [Diagram 5] FIG. 13 is a partial perspective view of the form showing the hinge plate portion. [Figure 6] FIG. 13 is a partial perspective view of a foam showing a portion of an alternative hinge plate. [Figure 7] (a) is a cross-sectional view showing a state in which a skin plate protrudes, (b) is a cross-sectional view showing a state in which a step occurs in the covering concrete, (c) is a cross-sectional view showing a state in which a gap occurs between the skin plates, and (d) is a cross-sectional view showing a state in which a protrusion occurs in the covering concrete. [Figure 8] FIG. 4 is a cross-sectional view showing the foam unit removed. [Figure 9] FIG. [Figure 10] FIG. 4 is a perspective view showing a jig of a first jig device. [Figure 11] FIG. 4 is a cross-sectional view showing a jig of a first jig device. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. 4 is a perspective view showing a jig of a second jig device. [Figure 15] FIG. 4 is an exploded perspective view of a reference plate of the second jig device. [Figure 16] FIG. 4 is a cross-sectional view of a jig of a second jig device. [Figure 17] FIG. [Figure 18] 1A is a front view showing the second plate of the reference plate in the positioning position of the hinge plate, FIG. 1B is a front view showing the second plate of the reference plate having been moved from the positioning position, FIG. 1C is a cross-sectional view showing the second plate of the reference plate in the positioning position of the hinge plate, and FIG. 1D is a cross-sectional view showing the second plate of the reference plate having been moved from the positioning position. [Figure 19] FIG. 4 is a front view showing the positioning state of the skin plate and the reinforcing member. [Figure 20] FIG. 13 is a front view showing the positioning state of the skin plate and another reinforcing member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for fixing a hinge plate in a concrete formwork apparatus for forming a tunnel lining concrete and a jig device for fixing a hinge plate according to the present invention will be described with reference to the drawings.

[0018] First, the configurations of the first and second jig devices serving as fixing jigs for positioning the hinge plates 17, 18 relative to the reinforcing member 13 formed to have an angled cross section will be described.

[0019] Configuration of the first jig device The configuration of the first jig device 31 for positioning one hinge plate 17 on each of the two end portions of the reinforcing member 13 will be described.

[0020] As shown in Fig. 9, the reinforcing member 13 as a plate-shaped base material is placed on one side of the angle on the device stand 32 of the first jig device 31. A positioning member 33 is fixed to one end position on the device stand 32. Therefore, the left and right position of the reinforcing member 13 is determined by contacting one left and right end of the reinforcing member 13 with the positioning member 33. Holding members 34 are provided near both ends of the positioned reinforcing member 13 to hold the reinforcing member 13 in a fallen position with one side downward. The holding members 34 are positioned at a holding position where they press and hold the reinforcing member 13 in the fallen position and at a release position where they are released from the holding position by the action of an actuator (not shown) that operates according to the instruction of the operator.

[0021] 9 and 10, jigs 36 are arranged at two spaced apart positions on the top surface of the device stand 32, and these jigs 36 are for positioning one hinge plate 17 with respect to each of the side surfaces at both ends of the reinforcing member 13. The jigs 36 are fixed to the device stand 32 at a base 35. The rear side surface of this base 35 (the surface on the reinforcing member 13 side) forms a positioning surface 35a for positioning the front end surface of the reinforcing member 13 in the width direction.

[0022] As shown in Figures 9 to 11, one support plate 37 is fixed upright on the upper surface of each base 35. A reference plate 40 serving as a reference member located above the positioning surface 35a is fixed to one side of the support plate 37 with a bolt 39. A reference hole 38 having an axis parallel to the upper surface of the device stand 32 is formed in the reference plate 40, and a female screw 45 is formed on the inner peripheral surface of the reference hole 38. The side of the reference plate 40 is located in a plane perpendicular to the upper surface of the device stand 32.

[0023] As shown in Figs. 10 to 12, a reference pin 41 is removably inserted into the reference hole 38. The jig 36 includes a base 35, a support plate 37, a reference plate 40, and a reference pin 41. The reference pin 41 has a large-diameter handle 42 at one end, a small-diameter male screw 43 at the other end, and a shaft portion 46 between them, the shaft portion 46 having a smaller diameter than the handle 42 and a larger diameter than the male screw 43. Tapered inclined surfaces 44, 47 are formed at the tip of the male screw 43 and the tip of the handle 42, respectively. The male screw 43 of the reference pin 41 is screwed into the female screw 45 of the reference plate 40. The inclined surface 47 is engageable with the periphery of the hinge hole 16.

[0024] <Configuration of the second jig device> Next, the configuration of a second jig device 51 for positioning the two hinge plates 17 with respect to both ends of the reinforcing member 13 will be described.

[0025] 13 and 14, the second jig device 51 has a pair of jigs 52, similar to the first jig device 31, but the configuration of the jigs 52 is different from the jig 36 of the first jig device 31. The positioning member 33 and the holding member 34 have the same configuration as the first jig device 31.

[0026] As shown in Figs. 14 and 15, the jig 52 is for positioning the two hinge plates 18 at a distance from each other on the side surfaces of both ends of the reinforcing member 13. A base 54 fixed on a device stand 53 is formed with a positioning surface 54a for positioning the front end of the reinforcing member 13 lying down on the device stand 53. A support plate 57 is fixed upright on the base 54. A reference plate 55 as a reference member is supported and fixed on the support plate 57. A reference hole 56 having an axis parallel to the upper surface of the device stand 53 is formed through the reference plate 55. Both side surfaces of the reference plate 55 are formed at right angles to the upper surface of the device stand 53. The reference plate 55 is composed of a first plate 58 as a first member fixed to the support plate 57 by a bolt 59 and a nut 60, and a second plate 62 as a second member movably stacked on the side surface of the first plate 58.

[0027] A long hole 63 extending in the vertical direction is formed in the second plate 62 of the reference plate 55, and the second plate 62 is attached to the first plate 58 by a stepped bolt 61 that passes through the long hole 63 and is screwed into a screw hole 64 in the first plate 58. The long hole 63 has a bottom 63a, and a head 61a of the stepped bolt 61 engages with this bottom 63a. Therefore, the second plate 62 can move up and down within the range of the difference between the vertical length of the bottom 63a of the long hole 63 and the diameter of the stepped portion of the stepped bolt 61.

[0028] Slopes 65, 66 are formed on the contact surfaces of the first plate 58 and the second plate 62, respectively, and the thickness of the reference plate 55 can be changed with the up and down movement of the second plate 62 by the cam action of these slopes 65, 66. Then, as shown in Figures 16, 18(a) and 18(c), when the second plate 62 rises and the reference holes 56 of the first plate 58 and the second plate 62 match, the thickness of the reference plate 55 matches the distance between the two hinge plates 18.

[0029] As shown in Figs. 16 and 17, the reference pin 70 of the jig 52 is formed by dividing a first pin 71 and a second pin 72. The jig 52 includes a base 54, a support plate 57, a reference plate 55, and a reference pin 70. The first pin 71 has a large-diameter handle 73 on one end, a small-diameter male screw 74 on the other end, and a shaft portion 78 between them, which is smaller in diameter than the handle 73 and larger in diameter than the male screw 74. The handle 73, the shaft portion 78, and the male screw 74 have tapered inclined surfaces 76, 83, and 75 formed at the tips of the handle 73, the shaft portion 78, and the male screw 74, respectively. The second pin 72 has a large-diameter handle 77 on one end, and a small-diameter shaft portion 79 on the other end. The handle 77 and the shaft portion 79 have tapered inclined surfaces 81 and 80 formed at the tips of the handle 77 and the shaft portion 79, respectively. A female screw 82 is formed on the axis of the shaft portion 79. The male screw 74 and the female screw 82 can be screwed together. The beveled surfaces 76 , 81 of the handles 73 , 77 are engageable with the periphery of the hinge hole 16 .

[0030] <Method of positioning and fixing the hinge plate> Next, a method of positioning and fixing the hinge plates 17, 18 to the reinforcing member 13 using the first and second jig devices 31, 51 configured as described above will be described. Although not shown, the jigs 36, 52 of the first and second jig devices 31, 51 can be adjusted left and right in order to accommodate differences in the length of the reinforcing member 13 and the positions of the hinge plates 17, 18.

[0031] <Method of positioning hinge plate using first jig device> 9, in the first jig device 31, with the reinforcing member 13 placed on the device stand 32, one end of the reinforcing member 13 is regulated by the positioning member 33 to determine the left-right position of the reinforcing member 13. In this state, when the front end of the reinforcing member 13 is brought into contact with the positioning surface 35a of the base 35, the reinforcing member 13 is positioned with respect to the reference hole 38 of the reference plate 40 of the jig 36. Then, the reinforcing member 13 is clamped and fixed onto the device stand 32 by the holding member 34.

[0032] 9 and 11, one each of the left and right hinge plates 17 is placed along the side surfaces of the support plates 37 of the left and right jigs 36, and the reference hole 38 of the reference plate 40 is opposed to the hinge hole 16 of the hinge plate 17. Then, the reference pin 41 is inserted into the reference hole 38 and the hinge hole 16 so that the hinge hole 16 is fitted onto the reference pin 41, and the male thread 43 of the reference pin 41 is screwed into the female thread 45 of the reference hole 38. In this way, the reference pin 41 and the reference hole 38 are aligned by the action of the screw.

[0033] When the reference pin 41 is inserted into the reference hole 38 and the hinge hole 16, the inclined surface 44 on the tip side of the reference pin 41 engages with the periphery of the hinge hole 16 of the hinge plate 17 and the periphery of the reference hole 38 to guide the insertion of the reference pin 41. When the male thread 43 of the reference pin 41 is screwed into the female thread 45 of the reference hole 38, the inclined surface 47 of the reference pin 41 engages with the periphery of the hinge hole 16 of the hinge plate 17, and the hinge plate 17 is held by the inclined surface 47. Therefore, the hinge hole 16 is aligned with the shaft portion 46 of the reference pin 41. At this time, the reference pin 41 is aligned with the reference hole 38 as described above. Therefore, the hinge hole 16 of the hinge plate 17 is aligned with the reference hole 38 via the reference pin 41. Therefore, the hinge plate 17 is aligned with the reinforcing member 13, which is also positioned with respect to the reference hole 38, at the hinge hole 16, which is centered with the reference hole 38. In this state, the outer periphery of the hinge plate 17 is fixed to the reinforcing member 13 by welding.

[0034] After welding, the clamp by the holding member 34 is released, and the reinforcing member 13 having the hinge plate 17 is removed from the apparatus stand 32. <Method of positioning hinge plate using second jig device> As shown in FIG. 13, in the second jig device 51, the reinforcing member 13 installed on the device stand 53 is positioned in the left-right direction by the positioning member 33 in the same manner as described above. Also, the reinforcing member 13 is positioned in the front-rear direction by the positioning surface 54a of the base 54 of the jig 52. Therefore, the reinforcing member 13 is positioned with respect to the reference hole 56 of the reference plate 55 of the jig 52. In this state, the reinforcing member 13 is clamped and fixed by the holding member 34. Next, as shown in FIG. 16, two hinge plates 18 are stacked on each side of the reference plate 55. At this time, as shown in FIG. 18(a) and FIG. 18(c) and FIG. 16, the second plate 62 is placed in the upper position by the operator, so that the reference holes 56 of the first plate 58 and the second plate 62 correspond to each other.

[0035] As shown in Figs. 13 and 16, the first pin 71 and the second pin 72 of the reference pin 70 are inserted into the hinge holes 16 of the two hinge plates 18 and the reference hole 56 of the reference plate 55 from both sides, and the male screw 74 and the female screw 82 are screwed together. The first pin 71 and the second pin 72 may be inserted from either the left or right side. Therefore, the hinge hole 16 is fitted onto the reference pin 70. At this time, even if the tolerance between the reference hole 56 and the shafts 78, 79 of the first pin 71 and the second pin 72 is small, the shafts 78, 79 are smoothly inserted into the reference hole 56 by the inclined surfaces 83, 80 on the tip side of the shafts 78, 79. Then, the reference pin 70 and the reference hole 56 are aligned.

[0036] Furthermore, the male thread 74 of the first pin 71 and the female thread 82 of the second pin 72 are screwed together, and as the screwing progresses, the inclined surfaces 76, 81 of the first pin 71 and the second pin 72 engage with the inner edges of the hinge holes 16. Therefore, the hinge holes 16 of the two hinge plates 18 are aligned with the reference pin 70, and the hinge plates 18 are held by the inclined surfaces 76, 81. As a result, the hinge plates 18 are aligned with the reference hole 56 via the reference pin 70, and the hinge holes 16 of the hinge plates 18 are positioned with respect to the reinforcing member 13 aligned with the reference hole 56. In this state, the outer periphery of the hinge plates 18 is welded to the reinforcing member 13.

[0037] After welding, the clamping by the holding member 34 is released, and the reference pin 70 is removed, and the reinforcing member 13 is taken out from the device stand 32. In this case, when the two hinge plates 18 are removed from the jig 52, the hinge plates 18 may grip the reference plate 55 strongly from both sides, making it difficult to remove the hinge plates 18 from the reference plate 55. This is because, if the amount of filler metal at the welding point of the hinge plates 18 to the reinforcing member 13 is excessively applied on the reference plate 55 side, at least one of the hinge plates 18 tends to tilt toward the reference plate 55 side due to hardening and shrinkage of the filler metal. In such a case, as shown in Figures 18(b) and 18(d), if the second plate 62 is moved by pushing it downward, the second plate 62 will retreat toward the first plate 58 side due to the cam action of the inclined surfaces 65, 66, and the thickness of the reference plate 55 will become thinner. Therefore, the hinge plates 18 can be easily removed from the reference plate 55.

[0038] <Fixing of reinforcing member and skin plate> In this manner, one hinge plate 17 and two hinge plates 18 are accurately attached to the two reinforcing members 13 at their respective predetermined positions.

[0039] Next, a method for attaching the reinforcing member 13, to which the hinge plates 17 and 18 are attached, to the side surface (rear surface) of the skin plate 14 serving as a plate material will be described. 19 and 20, a third jig device 91 and a fourth jig device 92 have a reference hole 94 for inserting a reference pin 93 different from the reference pins 41, 70, and positioning surfaces 95, 96 for the ends of the reinforcing member 13 and the skin plate 14. The positioning surfaces 95, 96 of the third jig device 91 position the end of the skin plate 14 so that it protrudes beyond the end of the reinforcing member 13. The positioning surfaces 95, 96 of the fourth jig device 92 position the end of the reinforcing member 13 so that it protrudes beyond the end of the skin plate 14.

[0040] Then, using a third jig device 91 and a fourth jig device 92, the reinforcing member 13 and the skin plate 14 are fixed by welding in a positioned state. Therefore, a structure in which an end of the skin plate 14 protrudes from an end of the reinforcing member 13 is formed by the third jig device 91. Also, a structure in which an end of the reinforcing member 13 protrudes from an end of the skin plate 14 is formed by the fourth jig device 92.

[0041] In this manner, the skin plate 14 and the hinge plates 17, 18 can be fixed with a highly accurate positional relationship with the hinge hole 16 as a reference. 3, when adjacent forms 12a, 12b, and 12c are connected by hinge shaft 19 inserted through hinge hole 16, skin plates 14 of forms 12a, 12b, and 12c form a continuous curved surface. Therefore, adjacent skin plates 14 can be butted together without forming steps or gaps.

[0042] Effects of the embodiment Therefore, this embodiment has the following advantages. (1) The skin plates 14 of adjacent forms 12a, 12b, 12c are positioned in an accurate positional relationship based on the hinge axis 19. Therefore, the skin plates 14 can be made continuous without forming steps or gaps. For this reason, when the lining concrete C is molded using a form unit 12 consisting of such forms 12a, 12b, 12c, the molded surface of the lining concrete C does not have steps or the like as shown in Figures 7(b) and 7(d). Therefore, when the form unit 12 is removed from the form, concrete peeling does not occur at the parts such as steps on the molded surface of the lining concrete C. This improves the finishing quality when molding the lining concrete C.

[0043] (2) In the second jig device 51, after the hinge plates 18 are welded, the second plate 62 can be moved downward to make the reference plate 55 thinner. Therefore, even if the two hinge plates 18 are inclined so as to tightly grip the jig 52, the hinge plates 18 can be easily detached from the reference plate 55 of the jig 52.

[0044] <Example of change> The present invention is not limited to the above-described embodiment, and may be embodied in the following manner.

[0045] In the above embodiment, the present invention can be embodied in the configuration of the hinge connection portion of the form unit 12, but it can also be embodied in other portions. For example, it can be embodied in a structural material consisting of a member forming the framework of the formwork device 11 and a scaffolding hinged to the member. In this case, for example, the scaffolding frame serves as a base material having a hinge.

[0046] In the above embodiment, the jigs 36, 52 of the first and second jig devices 31, 51 are provided at both left and right ends of the devices 31, 51. When the hinge plates 17, 18 are provided at the intermediate position in the longitudinal direction of the reinforcing member 13, the jigs 36, 52 are also provided at the intermediate position between both ends of the first and second jig devices 31, 51.

[0047] A magnet is used instead of a screw structure to connect the first pin 71 and the second pin 72 of the reference pin 70 in the jig 52 of the second jig device 51. In this case, a tapered convex portion is formed at the tip of one of the first pin 71 and the second pin 72, and a tapered concave portion that is mated with the convex portion is formed at the other.

[0048] When the forms 12a, 12b, and 12c of the form unit 12 are connected to each other by only one hinge plate 17, the present invention is carried out using only the first jig device 31. When the forms 12a, 12b, and 12c of the form unit 12 are connected to each other using only two hinge plates 18, the present invention is carried out using only the second jig device 51.

[0049] The base 35, 54 of the jig 36, 52 may be omitted, and the reference plate 40, 55 may be set up on the device stand 32, 53 alone. [Explanation of symbols]

[0050] 11...Concrete formwork equipment 12…Foam unit 12a…Ten Form 12b…Side Form 12c…Invert Form 13…Reinforcing member 14. Skin plate 16...Hinge hole 17,18…Hinge plate 19…Hinge axis 31…First fixture device 32…Equipment stand 35a... Positioning surface 36,52…Jig 38...Reference hole 41,70…Reference pin 44…Slope 43,74…Male thread 45,82…Female thread 47,65,66,76,81...Slope 51...Second jig device 54a... Positioning surface 56...Reference hole 58...1st board 62…Second board 70…Reference pin 71…1st pin 72…Second pin C…Lining concrete

Claims

1. A method for fixing a hinge plate, comprising the steps of: positioning a plate-shaped base material used in a concrete formwork device for forming a tunnel lining concrete; and a hinge plate fixed to a side surface of the base material and having a hinge hole, using a jig to fix the base material and the hinge plate; A method for fixing a hinge plate in a concrete formwork device, comprising the steps of: positioning the base material with respect to a reference hole of a reference member provided on the jig; in that state, placing the hinge plate on the side of the reference member; inserting a reference pin into the hinge hole and the reference hole; and engaging the inclined surface formed on the outer periphery of the reference pin with the peripheral edge of the hinge hole, thereby positioning the hinge plate with respect to the reference hole; and then welding the outer periphery of the hinge plate to the base material.

2. 2. The method for fixing a hinge plate in a concrete formwork apparatus according to claim 1, wherein the base material is fixed to a side surface of a plate material used in the concrete formwork apparatus.

3. 3. A method for fixing a hinge plate in a concrete formwork apparatus as described in claim 2, wherein the plate material is a skin plate of the concrete formwork apparatus, the base material is a reinforcing member that reinforces the skin plate, and the hinge plate is connected to the reinforcing member on the side of an adjacent other skin plate via a hinge axis.

4. 4. A method for fixing a hinge plate in a concrete formwork apparatus according to claim 3, further comprising the steps of: overlapping one of the hinge plates on a side surface of the reference member; and screwing a male screw at one end of the reference pin into a screw on an inner circumference of the reference hole.

5. 5. A method for fixing a hinge plate in a concrete formwork apparatus as described in claim 4, wherein the hinge plate is aligned along each side of the reference member, and the male thread of one of the reference pins formed as two separate pins is screwed into the inner thread of the other pin.

6. 6. A method for fixing a hinge plate in a concrete formwork apparatus as described in claim 5, wherein the reference member is constructed of a first member and a second member, and after welding the hinge plate, the second member is moved to reduce the thickness of the reference member by a cam action utilizing a slope between the first member and the second member.

7. A concrete formwork device for forming a tunnel lining concrete, A device stand; and a jig provided on the device stand, The jig is a positioning surface located on a plane perpendicular to an upper surface of the device base; a reference member having a side surface perpendicular to the upper surface of the device base above the positioning surface and having a reference hole located on an axis parallel to the upper surface of the device base; a reference pin that is inserted into the reference hole; A jig device for fixing a hinge plate in a concrete formwork device, in which a slope is formed on the outer periphery of the reference pin so that it can engage with the periphery of a hinge hole of a hinge plate superimposed on the side of the reference member.

8. 8. A jig device for fixing a hinge plate in a concrete formwork device as described in claim 7, wherein the reference hole of the reference member has a female thread on its inner circumference, and the reference pin has a male thread that screws into the female thread.

9. The reference pin has a first pin having a male thread and a second pin having a female thread that screws into the male thread, and the first pin and the second pin are formed with the inclined surfaces.

10. The reference member has a first member and a second member arranged to be movably arranged along the side of the first member, and a slope is formed on the mating surfaces of the first member and the second member, and the thickness of the reference member is changed by the cam action of the slope due to the movement of the second member.

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