Method for fixing hinge plates in concrete formwork apparatus and jig apparatus for fixing hinge plates

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 hinge plate fixing method for fixing a hinge plate having a hinge hole to a base material, and a jig device for fixing the hinge plate, in a concrete formwork apparatus for forming tunnel lining concrete. [Background Art]

[0002] As shown in FIG. 1 and FIG. 2, the lining concrete C on the inner circumference of a tunnel T is formed by a concrete formwork apparatus (hereinafter simply referred to as a formwork apparatus) 11. This formwork apparatus 11 includes a steel foam unit 12 formed by connecting a plurality of foams, and the lining concrete C is molded by this foam unit 12. The foam unit 12 has a generally arched curve shape as a whole. The foam unit 12 comprises a crown foam 12a located at the top, side foams 12b at the lower portions of both ends of the crown foam, and an invert foam 12c further at the lower portion of the side foams.

[0003] These forms 12a, 12b, and 12c have the configuration shown in Figures 3 to 6. Specifically, each form 12a, 12b, and 12c has a skin plate 14 on its outer circumference that constitutes the molded surface of the lining concrete C. Reinforcing members 13, which are bent into an angle cross-section, are fixed to both ends of the back surface, which is the inner circumference side of the skin plate 14, respectively, to reinforce the entire form 12a, 12b, and 12c. Side plates 15 are fixed to both ends of the back surface of the skin plate 14. Hinged plates 17 and 18, each having hinge holes 16, are fixed by welding to two locations on the left and right ends of the reinforcing member 13. Adjacent forms 12a, 12b, and 12c are rotatably connected by hinge shafts 19 that pass through the hinge holes 16. The hinge plates 17 at one end of each interconnected form 12a, 12b, and 12c are provided at the left and right positions, and the hinge plates 18 at the other end are provided at the left and right positions, with one hinge plate 17 being sandwiched between two hinge plates 18. The hinge plates 17 and 18 are not only provided at both the left and right ends, but may also be provided at intermediate positions in the left-right direction if the left-right length of the reinforcing member 13 is long.

[0004] As shown in Figures 3 and 4, the upward ends of the skin plates 14 of forms 12a, 12b, and 12c protrude from the width end of the reinforcing member 13. The downward ends of the skin plates 14 are set back from the width end of the reinforcing member 13. When the form unit 12 for forming the lining concrete C is constructed, the end faces of the width ends of the skin plates 14 of adjacent forms 12a, 12b, and 12c are in a butt-to-butt contact state. At this time, the concrete molding surfaces, which are the surfaces of the skin plates 14 of adjacent forms 12a, 12b, and 12c, are continuous at the butt joint to form a continuous curved surface, and the space between the ends of both skin plates 14 is closed by the reinforcing member 13. As a result, no steps or other differences are formed between the skin plates 14 and the lining concrete C at the butt joint of 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 and 18 fixed to the reinforcing member 13. If the hinge shaft 19 is passed through the hinge hole 16 while the positional accuracy of the hinge plates 17 and 18 is poor, it often results in the molded surface of the skin plate 14 not being continuous on the same plane. In such cases, steps or other irregularities may occur on the molded surface of the lining concrete C, and the finish quality of the molded surface deteriorates.

[0006] Patent Document 1 discloses a technology that attempts to solve 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 and 18 are fitted onto a reference pin inserted into a reference hole in the jig. In other words, by aligning the hinge holes 16 of the hinge plates 17 and 18 with the reference pin inserted into the reference hole in the jig, the positional accuracy of the hinge plates 17 and 18 relative to the reference hole is maintained. The hinge plates 17 and 18, with their positional accuracy maintained, are then welded and fixed to the reinforcing member 13 positioned relative to the reference hole. Note that when the hinge plates 17 and 18 are supported by the reference pin, their outer edges face the reinforcing member 13 with a small gap between them, and the welding filler material is provided to fill this gap.

[0007] Patent Document 1 states that, as described above, the positional relationship between the hinge hole 16 and the reinforcing member 13 is maintained with high precision based on the reference hole. As a result, the skin plate 14 fixed to the reinforcing member 13 can be positioned in a fixed position relative to the hinge hole 16. Therefore, steps or other differences will not occur between the skin plates 14 of adjacent foam units 12, and the molded surfaces of the skin plates 14 will be continuous on the same plane. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2017-75501 [Overview of the project] [Problems that the invention aims to solve]

[0009] However, the conventional technology described in Patent Document 1 presents the following problem: It is difficult to accurately form hinge holes 16 of a predetermined shape in the hinge plates 17 and 18. As a result, gaps of various sizes are formed between the reference pin and each hinge hole 16. When aligning the reference pin and the hinge holes 16, the hinge plates 17 and 18 are often positioned lower than the reference pin due to their own weight by the amount of the uneven gaps. In other words, the hinge plates 17 and 18 are positioned with various misalignments due to the uneven gaps and then welded to the reinforcing member 13.

[0010] As a result, the hinge shaft 19 inserted into the hinge hole may come out of its designated position. As shown in Figures 7(a) and 7(c), when the hinge shaft 19 comes out of its designated position, steps or gaps occur between the ends of the skin plates 14 of adjacent forms 12a, 12b, and 12c. In such a situation, for example, as shown by the dashed line in Figure 7(a), the ends of the skin plates 14 press against each other, causing the ends to protrude upwards. Alternatively, as shown in Figure 7(c), gaps occur between the ends of the skin plates 14. Therefore, as shown in Figures 7(b) and 7(d), there is a high possibility that steps Ca or protruding streaks Cb will form on the surface of the lining concrete C in the area between the ends of 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] Incidentally, as shown in Figure 8, after the lining concrete C is formed, the form unit 12 needs to be demolded from its position. During this demolding, the side form 12b and invert form 12c are retracted and rotated inward around the hinge axis 19, and the entire form unit 12 is lowered. In this case, if steps Ca and grooves Cb shown in Figures 7(b) and 7(d) are formed on the concrete molded surface, the lowering of the form unit 12 will scrape off the steps Ca and grooves Cb, especially the edges of the skin plate 14 of the top form 12a. As a result, the concrete molded surface that is continuous below the scraped-off steps Ca and grooves Cb will peel off. Consequently, larger defects than the steps Ca and grooves Cb will occur on the molded surface of the lining concrete C, and the finished quality of the lining concrete C will be greatly reduced. [Means for solving the problem]

[0012] The present invention relates to a method for fixing a hinge plate in a concrete formwork device, wherein a plate-shaped base material used in a concrete formwork device for forming tunnel lining concrete and a hinge plate fixed to the side surface of the base material and having a hinge hole are positioned using a jig to fix the base material and the hinge plate, and the method is characterized in that the base material is positioned with respect to a reference hole of a reference member provided on the jig, the hinge plate is then placed on the side surface of the reference member, a reference pin is inserted into the hinge hole and the reference hole, and the inclined surface formed on the outer circumference of the reference pin is engaged with the periphery of the hinge hole to position the hinge plate with respect to the reference hole, and then the outer circumference of the hinge plate is welded to the base material.

[0013] Furthermore, in the jig device for fixing hinge plates in the concrete formwork device of the present invention, the concrete formwork device for forming tunnel lining concrete comprises a device base and a jig provided on the device base, wherein the jig has a positioning surface located on a surface perpendicular to the upper surface of the device base, a side surface above the positioning surface that is perpendicular to the upper surface of the device base and has a reference hole located on an axis parallel to the upper surface of the device base, and a reference pin inserted into the reference hole, wherein the outer circumference of the reference pin has a slope formed so as to be able to engage with the periphery of the hinge hole of the 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 centered state with respect to the reference hole of the jig by the action of the slope. For this reason, if the base material is positioned relative 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 by a hinge axis at the hinge hole, the positional relationship between the hinge hole and the reinforcing member is accurate, so adjacent skin plates can be joined without gaps or steps occurring between them. For this reason, the lining concrete can be finished with a high finish quality using the skin plate. [Effects of the Invention]

[0015] According to the present invention, when forming tunnel lining concrete, it is possible to improve the finishing quality. [Brief explanation of the drawing]

[0016] [Figure 1] A cross-sectional view showing the usage status of a concrete formwork device. [Figure 2] Side view of a concrete formwork assembly. [Figure 3] Cross-sectional view of the hinge section connecting the foam pieces. [Figure 4]Also an exploded cross-sectional view of the hinge portion connecting between forms. [Figure 5] A partial perspective view of a form showing the hinge plate portion. [Figure 6] A partial perspective view of a form showing another hinge plate portion. [Figure 7] (a) is a cross-sectional view showing a state where a skin plate protrudes, (b) is a cross-sectional view showing a state where a step is generated in lining concrete, (c) is a cross-sectional view showing a state where a gap is generated between skin plates, (d) is a cross-sectional view showing a state where a protrusion is generated in lining concrete. [Figure 8] A cross-sectional view showing a removed state of a form unit. [Figure 9] A perspective view showing a first jig device. [Figure 10] A perspective view showing a jig of the first jig device. [Figure 11] A cross-sectional view showing a jig of the first jig device. [Figure 12] A front view showing a reference pin. [Figure 13] A perspective view showing a second jig device. [Figure 14] A perspective view showing a jig of the second jig device. [Figure 15] An exploded perspective view of a reference plate of the second jig device. [Figure 16] A cross-sectional view of a jig of the second jig device. [Figure 17] An exploded perspective view of a reference pin. [Figure 18] (a) is a front view showing a state where the second plate of the reference plate is at the positioning position of the hinge plate, (b) is a front view showing a state where the second plate of the reference plate has moved from the positioning position, (c) is a cross-sectional view showing a state where the second plate of the reference plate is at the positioning position of the hinge plate, (d) is a cross-sectional view showing a state where the second plate of the reference plate has moved from the positioning position. [Figure 19] A front view showing a positioning state of a skin plate and a reinforcing member. [Figure 20] A front view showing a positioning state of a skin plate and another reinforcing member. MODES FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, embodiments of a method for fixing hinge plates and a jig device for fixing hinge plates in a concrete formwork device for forming tunnel lining concrete, which embodies the present invention, will be described with reference to the drawings.

[0018] First, the configuration of the first and second fixture devices, which serve as fixing fixtures for positioning the hinge plates 17 and 18 relative to the reinforcing member 13 formed in an angle 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 at each end of the reinforcing member 13 will now be described.

[0020] As shown in Figure 9, a reinforcing member 13, which is a plate-shaped base material, is placed on one side of its angle on the device base 32 of the first jig device 31. A positioning member 33 is fixed to one end of the device base 32. Therefore, by placing one end of the reinforcing member 13 in the left-right direction against the positioning member 33, the left-right position of the reinforcing member 13 can be determined. Near both ends of the positioned reinforcing member 13, holding members 34 are provided to hold the reinforcing member 13 in a tilted position with one side facing downwards. These holding members 34 are positioned in a holding position that presses and holds the reinforcing member 13 in a tilted position and a release position that releases the holding, by the action of an actuator (not shown) that operates according to the operator's instructions.

[0021] As shown in Figures 9 and 10, jigs 36 are positioned at two spaced locations on the upper surface of the device base 32. These jigs 36 are used to position one hinge plate 17 on each of the side surfaces of both ends of the reinforcing member 13. The jigs 36 are fixed to the device base 32 by a base 35. The rear side surface of this base 35 (the side facing the reinforcing member 13) constitutes 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, a support plate 37 is erected and fixed to the upper surface of each base 35. A reference plate 40, which serves as a reference member positioned above the positioning surface 35a, is fixed to one side of the support plate 37 by a bolt 39. A reference hole 38 is provided in the reference plate 40, having an axis parallel to the upper surface of the device base 32, and a female screw 45 is formed on the inner circumferential surface of this reference hole 38. The side surface of the reference plate 40 is located in a plane perpendicular to the upper surface of the device base 32.

[0023] As shown in Figures 10 to 12, a reference pin 41 is detachably 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 that is smaller in diameter than the handle 42 but larger in diameter than the male screw 43. Tapered bevels 44 and 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 bevels 47 can engage with the periphery of the hinge hole 16.

[0024] <Configuration of the second jig device> Next, the configuration of the second jig device 51 for positioning the two hinge plates 17 at each end of the reinforcing member 13 will be described.

[0025] As shown in Figures 13 and 14, the second jig device 51, like the first jig device 31, has a pair of jigs 52, but the configuration of the jigs 52 differs from that of the jigs 36 of the first jig device 31. The positioning member 33 and the holding member 34 have the same configuration as those of the first jig device 31.

[0026] As shown in Figures 14 and 15, the jig 52 is for positioning two hinge plates 18 at a distance from each other on the sides of both ends of the reinforcing member 13. A base 54 fixed on the device base 53 has a positioning surface 54a formed thereon for positioning the front end of the reinforcing member 13 which is positioned in a fallen state on the device base 53. A support plate 57 is fixed upright on the base 54. A reference plate 55, which serves as a reference member, is supported and fixed to this support plate 57. A reference hole 56 is provided through the reference plate 55, having an axis parallel to the upper surface of the device base 53. Both sides of the reference plate 55 are formed perpendicular to the upper surface of the device base 53. The reference plate 55 consists of a first plate 58, which serves as a first member, fixed to the support plate 57 by bolts 59 and nuts 60, and a second plate 62, which serves as a second member, which is movably superimposed on the side of the first plate 58.

[0027] A vertically extending elongated hole 63 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 is screwed into a threaded hole 64 of the first plate 58 through the elongated hole 63. The elongated hole 63 has a bottom portion 63a, and the head 61a of the stepped bolt 61 engages with this bottom portion 63a. Therefore, the second plate 62 can move up and down within the range of the difference between the vertical length of the bottom portion 63a of the elongated hole 63 and the diameter of the stepped portion of the stepped bolt 61.

[0028] The contact surfaces of the first plate 58 and the second plate 62 are formed with inclined surfaces 65 and 66, respectively. The cam action of these inclined surfaces 65 and 66 allows the thickness of the reference plate 55 to be changed as the second plate 62 moves up and down. 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 align, the thickness of the reference plate 55 matches the distance between the two hinge plates 18.

[0029] As shown in Figures 16 and 17, the reference pin 70 of the jig 52 is constructed by dividing it into 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 the reference pin 70. The first pin 71 has a large-diameter handle 73 at one end, a small-diameter male screw 74 at the other end, and a shaft portion 78 between them that is smaller in diameter than the handle 73 but larger in diameter than the male screw 74. Tapered bevels 76, 83, and 75 are formed at the ends of the handle 73, shaft portion 78, and male screw 74, respectively. The second pin 72 has a large-diameter handle 77 at one end and a small-diameter shaft portion 79 at the other end. Tapered bevels 81 and 80 are formed at the ends of the handle 77 and 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 inclined surfaces 76 and 81 of the handles 73 and 77 can engage with the periphery of the hinge hole 16.

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

[0031] <Method for positioning hinge plate using the first jig device> As shown in Figure 9, in the first jig device 31, with the reinforcing member 13 placed on the device base 32, one end of the reinforcing member 13 is restricted 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 relative 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 base 32 by the holding member 34.

[0032] In this state, as shown in Figures 9 and 11, one hinge plate 17 is placed on each side along the sides of the support plates 37 of the left and right jigs 36, and the reference hole 38 of the reference plate 40 and the hinge hole 16 of the hinge plate 17 are placed opposite each other. Then, the reference pin 41 is inserted into the reference hole 38 and the hinge hole 16 so that the hinge hole 16 fits onto the reference pin 41, and the male screw 43 of the reference pin 41 is screwed into the female screw 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 inserting the reference pin 41 into the reference hole 38 and the hinge hole 16, the beveled surface 44 on the tip side of the reference pin 41 engages with the periphery of the hinge hole 16 and the periphery of the reference hole 38 of the hinge plate 17, guiding the insertion of the reference pin 41. As the male thread 43 of the reference pin 41 is screwed into the female thread 45 of the reference hole 38, the beveled 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 beveled surface 47. As a result, the hinge hole 16 is aligned with the shaft portion 46 of the reference pin 41. At this time, as described above, the reference pin 41 is aligned with the reference hole 38. 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 relative to the reference hole 38, in the hinge hole 16 which is centered on the reference hole 38. In this state, the outer circumference 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 lifted off the device base 32. <Method for positioning the hinge plate using the second jig device> As shown in Figure 13, in the second jig device 51, similarly to the above, the reinforcing member 13 installed on the device base 53 is positioned in the left-right direction by the positioning member 33. In addition, the positioning surface 54a of the base 54 of the jig 52 is positioned in the front-rear direction. As a result, the reinforcing member 13 is positioned relative 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 Figure 16, two hinge plates 18 are stacked on each side of the reference plate 55. At this time, as shown in Figures 18(a), 18(c), and 16, the second plate 62 is positioned in an upper position by the worker, so that the reference holes 56 of the first plate 58 and the second plate 62 correspond to each other.

[0035] Then, as shown in Figures 13 and 16, the first pin 71 and the second pin 72 of the reference pin 70 are inserted from both sides into the hinge holes 16 of the two hinge plates 18 and the reference hole 56 of the reference plate 55, and the male screw 74 and the female screw 82 are screwed together. Note that the first pin 71 and the second pin 72 may be inserted from either the left or the right. Thus, 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 shaft portions 78 and 79 of the first pin 71 and the second pin 72 is small, the bevels 83 and 80 on the tip sides of the shaft portions 78 and 79 allow the shaft portions 78 and 79 to be smoothly inserted into the reference hole 56. Then, the reference pin 70 and the reference hole 56 are aligned.

[0036] Furthermore, as the male thread 74 of the first pin 71 and the female thread 82 of the second pin 72 are screwed together and the screwing progresses, the bevels 76 and 81 of the first pin 71 and the second pin 72 engage with the inner edges of each hinge hole 16. As a result, the hinge holes 16 of the two hinge plates 18 are aligned with the reference pin 70, and the hinge plates 18 are held in place by the bevels 76 and 81. Consequently, 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 relative to the reinforcing member 13 which is aligned with the reference hole 56. In this state, the outer circumference of the hinge plates 18 is welded to the reinforcing member 13.

[0037] After welding, the clamp by the retaining member 34 is released, and after removing the reference pin 70, the reinforcing member 13 is lifted from the device base 32. In this case, when removing the two hinge plates 18 from the jig 52, the two hinge plates 18 may grip the reference plate 55 tightly 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 material at the welding point of the hinge plate 18 to the reinforcing member 13 is excessive on the reference plate 55 side, the hardening shrinkage of the filler material will cause at least one of the hinge plates 18 to tilt toward the reference plate 55 side. In such cases, as shown in Figures 18(b) and 18(d), if the second plate 62 is moved by pushing it downward, the cam action of the slopes 65 and 66 will cause the second plate 62 to recede toward the first plate 58 side, and the thickness of the reference plate 55 will decrease. Therefore, the hinge plates 18 can be easily removed from the reference plate 55.

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

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

[0040] Then, the reinforcing member 13 and the skin plate 14 are fixed in position by welding using the third jig device 91 and the fourth jig device 92. As a result, the third jig device 91 creates a structure in which the end of the skin plate 14 protrudes from the end of the reinforcing member 13. Similarly, the fourth jig device 92 creates a structure in which the end of the reinforcing member 13 protrudes from the end of the skin plate 14.

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

[0042] <Effects of the Embodiment> Therefore, this embodiment has the following effects. (1) The skin plates 14 of adjacent forms 12a, 12b, and 12c are positioned in a precise positional relationship with respect to the hinge axis 19. Therefore, the skin plates 14 can be made continuous without the formation of steps or gaps. As a result, when the lining concrete C is formed using a form unit 12 consisting of such forms 12a, 12b, and 12c, steps and other irregularities shown in Figures 7(b) and 7(d) will not be formed on the molded surface of the lining concrete C. Therefore, when the form unit 12 is demolded, concrete spalling will not occur from areas with steps or other irregularities on the molded surface of the lining concrete C. Thus, the finishing quality of the lining concrete C can be improved.

[0043] (2) In the second jig device 51, the reference plate 55 can be made thinner by moving the second plate 62 downward after welding the hinge plate 18. Therefore, even if the two hinge plates 18 are tilted to strongly grip the jig 52, the hinge plates 18 can be easily detached from the reference plate 55 of the jig 52.

[0044] <Example of changes> The present invention is not limited to the embodiments described above, and may be embodied in the following forms.

[0045] In the above embodiment, the present invention was implemented in the configuration of the hinged connection portion of the form unit 12, but it is possible to implement it in other parts as well. For example, it can be implemented in a structural material consisting of a member that forms the skeleton of the formwork device 11 and scaffolding that is hinged to that member. In this case, for example, the frame of the scaffolding becomes the base material having the hinge.

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

[0047] - Instead of a screw structure, a magnet is used 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 forms a male-female relationship with the convex portion is formed at the other.

[0048] • When connecting the forms 12a, 12b, and 12c of the form unit 12 with only one hinge plate 17, the present invention should be implemented using only the first jig device 31. When connecting the forms 12a, 12b, and 12c of the form unit 12 using only two hinge plates 18, the present invention should be implemented using only the second jig device 51.

[0049] - The bases 35 and 54 of jigs 36 and 52 are omitted, and the reference plates 40 and 55 are erected independently on the device bases 32 and 53. [Explanation of Symbols]

[0050] 11…Concrete formwork equipment 12…Form Unit 12a... Heaven Form 12b... Side form 12c... Invert Form 13…Reinforcement member 14…Skin plate 16…Hinge holes 17, 18… Hinge plate 19...Hinge axis 31...First jig device 32…Equipment stand 35a... Positioning surface 36, 52... Jig 38...Reference hole 41, 70… Reference pin 44…Slope 43,74… Male screw 45,82…Female thread 47, 65, 66, 76, 81… slopes 51...Second jig device 54a... Positioning surface 56...Reference hole 58...1st board 62…Second board 70…Reference pin 71...1st pin 72...2nd pin C... Lining concrete

Claims

1. In a method for fixing a hinge plate, which involves positioning a plate-shaped base material used in a concrete formwork device for forming tunnel lining concrete, and a hinge plate fixed to the side surface of the base material and having hinge holes, using a jig, the base material and the hinge plate are fixed together. The reference member provided in the jig is composed of a first member and a second member, the first member and the second member having a reference hole, the reference pin is divided and formed as two pins, a first pin and a second pin, the first pin having a large diameter portion, a small diameter portion closer to the tip than the large diameter portion, and a shaft portion between the large diameter portion and the small diameter portion, each tip of the large diameter portion and the shaft portion having a tapered slope, the second pin having a large diameter portion and a small diameter shaft portion closer to the tip than the large diameter portion, each tip of the large diameter portion and the shaft portion having a tapered slope, the shaft portion of the second pin having a thread on its inner circumference, and the small diameter portion of the first pin having a male thread that can be screwed into the thread. The hinge plates are positioned along both sides of the reference member, and in this state, the first pin is inserted into the hinge hole of one of the hinge plates and the reference hole of the first member, and the second pin is inserted into the hinge hole of the other hinge plate and the reference hole of the second member, and the bevel formed on the outer circumference of the large diameter portion of the first pin is engaged with the periphery of the hinge hole, and the bevel formed on the outer circumference of the large diameter portion of the second pin is engaged with the periphery of the hinge hole, thereby positioning both hinge plates with respect to the reference holes, and then the outer circumference of the hinge plates is welded to the base material, A method for fixing a hinge plate in a concrete formwork device, wherein, after welding the hinge plate, the thickness of the reference member is reduced by a cam action utilizing the slope between the first member and the second member, by moving the second member.

2. A method for fixing a hinge plate in a concrete formwork device according to Claim 1, wherein the base material is fixed to the side surface of a plate material used in the concrete formwork device, the plate material is a skin plate of the concrete formwork device, 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 skin plate via a hinge axis.

3. In a concrete formwork device for forming tunnel lining concrete, Equipment stand and It is equipped with a jig mounted on the device stand, The aforementioned jig is A positioning surface located on a surface perpendicular to the upper surface of the device stand, A reference member having a side surface perpendicular to the upper surface of the device base above the positioning surface, and a reference hole located on an axis parallel to the upper surface of the device base, It has a reference pin that is inserted into the reference hole, The reference member comprises a first member and a second member movably arranged along the side surface of the first member, and the first member and the second member have the reference hole. The reference pin is divided into two pins, a first pin and a second pin, and the first pin has a large diameter portion, a small diameter portion closer to the tip than the large diameter portion, and a shaft portion between the large diameter portion and the small diameter portion, with tapered bevels formed at the tips of the large diameter portion and the shaft portion, respectively. The second pin has a large diameter portion and a small diameter shaft portion closer to the tip than the large diameter portion, with tapered bevels formed at the tips of the large diameter portion and the shaft portion, respectively. The shaft portion of the second pin has a thread on its inner circumference, and the small diameter portion of the first pin has a male thread that can be screwed into the thread. The inclined surface of the large-diameter portion of the first pin is capable of engaging with the periphery of the hinge hole of the hinge plate superimposed on the side surface of the first member, and the inclined surface of the large-diameter portion of the second pin is capable of engaging with the periphery of the hinge hole of the hinge plate superimposed on the side surface of the second member, A jig device for fixing a hinge plate in a concrete formwork device, wherein inclined surfaces are formed on the contact surfaces of the first member and the second member of the reference member, and the thickness of the reference member is changed by the cam action of the inclined surface due to the movement of the second member.

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