How to handle forms for concrete formwork equipment

Abstract

To provide a handling method to shorten a construction period of liner concrete of a tunnel.SOLUTION: A handling method constructs liner concrete of a tunnel suing forms on support devices installed on a ground surface T1 of the tunnel. A center form member 211 and end part form members 212 configuring a form 21 at the outside of the concrete form device are connected with hinges 41. The form 21 is to be assembled on the support devices so as to be formed in an arch shape, being developed through rotation of hinges 41 at the outside of the support device. And, the form 21 is formed in an arch shape through rotation of the hinges by lifting up the center form member 211 of the form 21 in a developed state.SELECTED DRAWING: Figure 15

Description

[Technical Field]

[0001] The present invention relates to a concrete formwork device having forms for forming secondary lining concrete (hereinafter referred to as lining concrete) on the inner surface of a tunnel. In particular, the present invention relates to a method for handling the forms of the concrete formwork device. [Background technology]

[0002] For example, Patent Document 1 discloses a concrete formwork device having forms for molding tunnel lining concrete. The forms include an arch-shaped top form located at the top of the concrete formwork device, arc-shaped side forms located on both sides, and an arc-shaped invert form located below them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-166312 Summary of the Invention [Problem to be solved by the invention]

[0004] The top form is usually constructed by connecting a central form member with a pair of end form members on both ends. Because the arch diameter of the top form is large, it cannot be stored in the truck bed when laid down. In addition, it is unstable when standing upright.

[0005] Therefore, in the past, when transporting a top form to a tunnel construction site, the central foam member and a pair of end foam members were loaded separately onto a truck bed. Therefore, the separated central foam member and end foam members were individually unloaded from the truck bed at the tunnel construction site, and then joined together by workers at the site to form the top form. The top form was then assembled onto the formwork device. However, because the central foam member and end foam members were large and heavy for workers, the joining work was time-consuming and almost painful.

[0006] Therefore, in the past, the amount of work required at the tunnel construction site increased, which was a factor in extending the construction period of the tunnel. [Means for solving the problem]

[0007] The method of handling forms for a concrete formwork device of the present invention is characterized in that, during at least one of the construction and dismantling of a concrete formwork device that is designed to form tunnel lining concrete using forms on a support device installed on the ground of a tunnel, the multiple form members that make up the form are handled while connected by hinges.

[0008] Here, handling of the form does not include handling of the form when it is assembled in the concrete formwork device. Construction and dismantling of the concrete formwork device includes transportation of the form and the form members that make up the form for construction and dismantling, as well as movement between processes.

[0009] In the above method, the foam to be handled is handled in a state where multiple foam members are connected by hinges. This allows multiple foam members to be handled as a single unit during truck transport, etc., reducing the effort required for loading and unloading the foam. This also shortens the time required to handle the concrete formwork device during tunnel construction. [Effects of the Invention]

[0010] According to the present invention, the time required to handle the concrete formwork device can be shortened, thereby achieving the effect of shortening the construction period for tunnel construction. [Brief explanation of the drawings]

[0011] [Figure 1] Front cross-sectional view showing the pouring state of the lining concrete. [Figure 2] FIG. 1 is a side view showing the foam unit in an assembled state. [Figure 3] FIG. 2 is a front cross-sectional view showing the formwork device in a state where the lower leg bodies are not connected. [Figure 4] FIG. [Figure 5] FIG. 1 is a perspective view showing the arched foam placed on the ground. [Figure 6] FIG. 10 is a perspective view showing the state in which the top form is being assembled onto the support device from the ground. [Figure 7] In the first embodiment, (a) is a perspective view showing the top form in an unfolded state loaded on a truck bed, and (b) is a partial perspective view showing the support structure of the top form relative to the end stand. [Figure 8] (a) is a perspective view showing the unfolded top form placed on the ground, and (b) is a partial perspective view showing the support structure of the top form relative to the central stand. [Figure 9] FIG. 10 is a perspective view of the hinge portion in the unfolded state of the top form. [Figure 10] FIG. 10 is a perspective view of the hinge portion when the top form is arched. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. [Figure 15](a) is a side view showing the Ten Form in an unfolded state on the ground, and (b) is a side view showing the Ten Form in an arched state on the ground. [Figure 16] In the second embodiment, (a) is a perspective view showing the top form in an unfolded state loaded on a truck bed, and (b) is a partial perspective view showing the receiving metal fittings. [Figure 17] (a) is an oblique view showing the unfolded top form placed on the ground, and (b) is a cross-sectional view showing the top form in the lifted state. [Figure 18] (a) is a side view showing the top form on the ground before the end form members are assembled, (b) is a side view showing the top form with the end form members assembled, and (c) is a side view showing the top form in an arched state on the ground. [Figure 19] In the third embodiment, (a) is a simplified cross-sectional view showing half of the top form in an unfolded state, and (b) is a simplified cross-sectional view showing half of the top form in an arched state. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. <Configuration and Construction Method of Concrete Formwork Device> First, the configuration and construction method of the concrete formwork device will be described mainly with reference to the drawings in FIGS.

[0013] As shown in Figures 1 and 2, the formwork device 11 includes a gantry-shaped support device 12 installed on the ground T1 of the tunnel T, and a plurality of curved arch-shaped form units 13 supported on the support device 12. A plurality of form units 13 are arranged side by side along the extension direction of the tunnel T. The lining concrete C is formed on the inner surface of the tunnel T by these arranged side by side form units 13.

[0014] As shown in Figures 1 and 2, the form unit 13 has a shallow arch-shaped top form 21 located at the top of the formwork device 11. The form unit 13 has arc-shaped side forms 22 located on both sides of the top form 21, and an arc-shaped invert form 23 located below the side forms 22. As shown in Figures 2 and 4, each of the forms 21, 22, 23 has a face plate 24 (see Figures 9 and 10) on its outer periphery. The face plate 24 has an opening 25 for inspection, etc., and a cover plate 26 is fitted into the opening 25 to close the opening 25.

[0015] As shown in Figure 1, when constructing the formwork device 11, a support device 12 is assembled on the ground T1 of the tunnel T. Then, a form unit 13 is supported on the support device 12. The support device 12 has legs 14 on both the left and right sides thereof. Wheels 17 at the lower ends of lower leg bodies 16 connected to the undersides of the legs 14 are supported on rails 18 on the ground T1 of the tunnel T. As shown in Figure 3, before the lower leg bodies 16 are connected to the legs 14, auxiliary legs 19 are attached to both the left and right sides of the legs 14.

[0016] As shown in Fig. 3, a beam member 15 is erected between the upper ends of the legs 14. Then, a top form 21, a side form 22, and an invert form 23 are assembled to the beam member 15 in this order, via various intermediate members 20 (shown in Fig. 6 but not shown in Figs. 1 and 3). The top form 21 is assembled onto the beam member 15 of the support device 12 before the lower leg body 16 is connected. Thereafter, the auxiliary legs 19 are removed, and the lower leg body 16 is assembled while the support device 12 is raised by a jack (not shown). Then, the side forms 22 are assembled to both ends of the top form 21, and then the invert form 23 is assembled to the lower end of the side form 22.

[0017] <Structure of Heaven Form> As shown in Figures 3 and 4, the top foam 21 is composed of a central foam member 211 and edge foam members 212. The edge foam members 212 are connected to both ends of the central foam member 211. Both foam members 211, 212 have side plates 27 on both sides of the back surface of the face plate 24. The central foam member 211 has end plates 28 on both ends of the back surface of the face plate 24. The edge foam member 212 has end plates 29, 30 on both ends of the face plate 24, and one end plate 29 is connected to the end plates 28 on both ends of the central foam member 211 with bolts and nuts (hereinafter, this combination will be simply referred to as bolts) 31. A hinge plate 32 is fixed to the other end plate 30 of the edge foam member 212 for connecting to the side foam members 22 with hinges 33 (see Figures 1 and 14).

[0018] <How to handle Tenfoam> Next, a method for handling the top form of the first embodiment will be described. As shown in Figures 4 to 6, when constructing the formwork device 11, the top form 21 is erected on the ground T1 of the tunnel T with both ends facing downwards. In this state, the rope S of the crane R is passed through an opening 25 in the center of the top form 21. A hanging fitting K located on the underside of the top form 21 is detachably attached to the lower end of the rope S.

[0019] 5 and 6, the crane R raises the sling K via the rope S, and the top form 21 is lifted through the engagement between the sling K and the inner edge of the opening 25. In this state, the crane R rotates to move the top form 21 to the support device 12 and assemble it onto the support device 12. Normally, the opening 25 is closed by a cover plate 26, but when the top form 21 is suspended by the sling K, the cover plate 26 of the opening 25 in the center of the top form 21 is removed. Then, when the suspension is completed, the opening 25 is closed by the cover plate 26.

[0020] When the top form 21 is to be removed in conjunction with the dismantling of the formwork device 11, the above-described procedure is carried out in reverse order. That is, the top form 21 is lifted from above the support device 12 by the lifting hardware K of the crane R and lowered onto the ground T1 of the tunnel T.

[0021] <Method of transporting top form and components used for transport> Next, a method for transporting the top form 21 from the factory or the like to the tunnel construction site will be described.

[0022] As shown in FIG. 7 and subsequent drawings, when the top form 21 is transported, members such as hinges 41, spacers 42, and casters 43, each of which is detachable, are attached to the top form 21.

[0023] As shown in Figures 7(a) and 8(a), hinges 41 are interposed between the central foam member 211 and the end foam member 212 on both sides of the top form 21. The central foam member 211 and the end foam member 212 are rotatably connected to each other via this hinge 41. As shown in Figures 9 to 11, the hinge 41 is made up of a first member 44 attached to the side plate 27 of the central foam member 211 with bolts 31, and a second member 45 attached to the side plate 27 of the end foam member 212 with bolts 31. The first member 44 has a shaft hole 40 and a pin hole 47 at one location. The second member 45 has a shaft hole 40 at one location and pin holes 47 at two locations. A pressure plate 46 is fixed to the first member 44 as a retaining member.

[0024] The first member 44 and the second member 45 are fixed to the central foam member 211 and the end foam member 212, respectively, by bolts 31. The first member 44 and the second member 45 are also connected by hinge shafts 51 that pass through the shaft holes 40 of the first member 44 and the second member 45.

[0025] 12 and 13, the spacer 42 has a pair of mounting pieces 49 that are fixed to the end plates 28, 29 of the central foam member 211 and the end foam member 212 by bolts 31 (not shown). A connecting piece 50 is connected between the two mounting pieces 49 by the bolts 31.

[0026] 14, the casters 43 have wheels 55. The casters 43 are attached to the hinge plates 32 of the end plates 30 of both end form members 212 at both ends of the top form 21 by shafts 56. The casters 43 are held in a fixed position by a plurality of stoppers 52 that abut against the end plates 30, etc.

[0027] As shown in FIG. 7(a), when the top form 21 is transported by truck, casters 43 are attached to both ends of the top form 21, and the central foam member 211 and the end foam member 212 are connected by hinges 41. The central foam member 211 and the end foam member 212 are then unfolded around the hinge shaft 51. A spacer 42 is interposed between the central foam member 211 and the end foam member 212 to maintain the top form 21 in an unfolded state. At this time, as shown in FIG. 9, one pin 53 is inserted through the pin hole 47 of the first member 44 and the pin hole 47 of the second member 45. Therefore, the hinge 41 is fixed so that it cannot be opened or closed, and the top form 21 is maintained in a flat unfolded state.

[0028] In this state, central stands 61 are attached to both sides of the central form member 211 of the top form 21. As shown in Figure 8(b), these central stands 61 are fixed to the side plates 27 of the central form member 211 with bolts 31. The central stands 61 are connected to other central stands 61 in the vertical direction at connecting protrusions 62 at their ends. This set of top forms 21 and central stands 61, connected in three tiers, is loaded onto the truck bed TR.

[0029] 7(a) and 7(b), a pair of end stands 63 are erected on both sides of the front and rear positions of the truck bed TR. The side plates 27 of both end form members 212 of the stacked top forms 21 are fixed to the end stands 63 with bolts 31. In this manner, three flat top forms 21 are loaded in a stacked state. In this state, the top forms 21 are raised above the floor surface of the truck bed TR without contacting the floor surface, and a gap is formed between the top forms 21 without them contacting each other.

[0030] <How to assemble the top form> As shown in Figure 7(a), in this state, the top form 21 is transported by truck and carried into the construction site of the tunnel T for the construction of the formwork device 11. Then, at the construction site, the bolts 31 between the end stands 63 and the side plates 27 are removed, and the set of the upper top form 21 and central stand 61 is lifted up by a crane R. At this time, the upper central stand 61 is separated from the central stand 61 below it.

[0031] Then, as shown in Figures 8 and 15(a), the set of the top form 21 and the central stand 61 is lowered to the ground T1 of the tunnel T. At this time, the set is in a state where the central stand 61 and the casters 43 are in contact with the ground T1, but the top form 21 is floating above the ground T1.

[0032] Next, by maintaining the lifting force of the rope S of the crane R, the spacer 42 between the central foam member 211 and the end foam member 212 is removed while the top form 21 is lifted. Also, the central stand 61 is removed from the top form 21.

[0033] The pin 53 of the hinge 41 is also removed from the pin holes 47 of the first member 44 and the second member 45. Then, the rope S of the crane R is pulled up. As a result, as shown in Figures 15(a) and 15(b), the wheels 55 of the casters 43 roll on the ground T1, while the end foam members 212 rotate around the hinge shafts 51 and rise. Therefore, the top form 21 approaches an arch shape. The edges of the side panels 27 of the central foam member 211 and the end foam members 212 are joined together in a butt-jointed state with the edges of the face panels 24 of both foam members 211 and 212. In this state, the top form 21 as a whole has an arch shape, and the face panels 24 are continuous on the same curved surface. The retainer plates 46 of the hinges 41 press down on the joined face panels 24.

[0034] Then, a pin 53 is inserted into the pin hole 47 of the first member 44 and another pin hole 47 of the second member 45. In this way, rotation of the first member 44 and the second member 45 of the hinge 41 is prevented while the top form 21 is in an arched shape. Therefore, the central form member 211 and the end form members 212 are fixed while the top form 21 is held down by the holding plate 46. At this time, the top form 21 is maintained in a suspended state by the rope S. In this state, as shown in FIG. 4, the end plates 29, 30 adjacent to the central form member 211 and the end form member 212 are fixed with bolts 31 as fixing members. Therefore, the top form 21 is fixed in an arched shape.

[0035] Thereafter, when assembling the top form 21 to the support device 12 of the formwork device 11, the hinge 41 is removed and the caster 43 is removed from the end form member 212, and then the top form 21 is lifted up and moved to the top of the support device 12 as shown in Figure 6.

[0036] When dismantling the formwork device 11, the top form 21 is handled in the reverse order of assembly. That is, the arch-shaped top form 21 is removed from the support device 12 by the crane R and lowered to near the ground T1. Then, at the lowered position where a lifting force is applied to the top form 21 by the rope S, the casters 43 are attached to the end form members 212. Next, the hinges 41 are attached to the top form 21. At this time, the hinges 41 are connected by the hinge shafts 51 and pins 53. In this manner, the face plates 24 of the central form member 211 and the end form members 212 are held down by the hold-down plates 46 of the hinges 41. Then, after the bolts 31 between the central form member 211 and the end form members 212 are removed, the pins 53 of the hinges 41 are removed.

[0037] Next, as the rope S is lowered, the top foam 21 rotates around the hinge axis 51 and is put into an expanded state. In this state, a pin 53 is inserted into the pin hole 47 of the first member 44 of the hinge 41 and into a pin hole 47 of the second member 45 that is different from the pin hole 47 in the arched state. Next, a spacer 42 is interposed between the central foam member 211 and the end foam members 212. Note that the pin 53 may be inserted into the pin hole 47 of the hinge 41 after the spacer 42 is interposed. Then, central stands 61 are attached to both sides of the central foam member 211.

[0038] Next, the unfolded top form 21 is lifted up and loaded onto the truck bed TR in three layers. Finally, the side panels 27 of the end form members 212 are fixed to the end stands 63. In this way, after the top form 21 is removed from the form device 11 when the form device 11 is dismantled, it is transported out of the tunnel construction site.

[0039] In this manner, a series of handling steps for the top form 21 are carried out, including transporting it to the tunnel construction site, constructing and dismantling the formwork device 11, transporting it from the tunnel construction site, and processes using the crane R during the construction and dismantling work.

[0040] (Effects of the first embodiment) This embodiment has the following advantages. (1) When constructing and dismantling the formwork device 11, the central form member 211 and the end form members 212 that make up the top form 21 are handled as an integrated unit connected by the hinges 41. Therefore, there is no need to handle the central form member 211 and the end form members 212 separately when loading and unloading them onto the truck bed TR, and handling can be completed in a short time. In addition, there is no need to assemble or disassemble the top form 21 at the construction site of the tunnel T. In this way, the number of tasks involved in constructing and dismantling the formwork device 11 can be reduced, thereby shortening the construction period for tunnel construction.

[0041] (2) The top form 21, which is assembled to form an arch shape on the support device 12, is unfolded via the hinge 41 outside the support device 12. In other words, the top form 21 becomes flat when unfolded, so it is not bulky and truck transportation can be performed stably.

[0042] (3) When constructing the formwork device 11, the top form 21 can be made into an arch shape by lifting the unfolded top form 21 above the ground after the hinges 41 are attached. Then, the arch shape can be fixed by the bolts 31. Therefore, when the hinges 41 are subsequently removed, the top form 21 can be stabilized, and the removal work can be carried out efficiently.

[0043] (4) The spacer 42 is interposed between the foam members 211, 212 of the top form 21 in the unfolded state, thereby maintaining the top form 21 in the unfolded state. Therefore, the top form 21 in the unfolded state can be handled as a nearly rigid structure, which makes it easy to handle when loading and unloading onto and from the truck bed TR.

[0044] (5) The top form 21 in the unfolded state can be loaded onto the truck bed TR via the central stand 61 and the end stands 63 so that its longitudinal direction is aligned with the front-to-rear direction of the truck bed TR, and can be transported. Therefore, the top form 21 can be loaded comfortably into the truck bed TR and can be transported stably by truck.

[0045] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 16 to 18, focusing on the differences from the first embodiment.

[0046] This embodiment is used for a large formwork device 11, and is therefore suitable for use when handling a large top form 21 or when the length of the truck bed TR is short. As shown in Figures 16(a) and 16(b) and Figures 17(a) and 17(b), when the top form 21 is transported by truck, the top form 21 is composed of a central foam member 211 and one end foam member 212. At this time, as in the first embodiment, the central foam member 211 is supported by the central stand 61, and the end foam member 212 is supported by the end stand 63. The other end foam member 212 is transported by a separate truck (not shown). At this time, as in the first embodiment, the central foam member 211 and one end foam member 212 are connected by a hinge 41 via a hinge shaft 51 and a pin 53. Furthermore, a spacer 42 is interposed between the central foam member 211 and one end foam member 212, and a caster 43 is attached to one end foam member 212.

[0047] 16(a), (b) and 17(a), a receiving bracket 81 is attached by a bolt 31 to the top form 21 to which the other end form member 212 is not connected. The receiving bracket 81 is attached to both sides of the central form member 211 at a position corresponding to the center of gravity of the top form 21. The receiving bracket 81 has a plurality of hanging holes 82.

[0048] Then, at the construction site of tunnel T, as shown in Figure 17(b), a pair of hooks RF at the tip of a rope S of crane R are hung on hanging holes 82 of receiving fittings 81. The hooks RF are supported by supports SP detachably provided at the tip of the rope S.

[0049] 18(a) to 18(c), the top foam 21 is lowered in an unfolded state onto the ground T1 together with the central stand 61 and the end stand 63, and the hook RF is released. In this state, the other end foam member 212 is assembled to the central foam member 211 using the hinge 41 having the hinge shaft 51 and the pin 53. In this case, the spacer 42 is not interposed between the central foam member 211 and the other end foam member 212.

[0050] Then, the spacer 42 between the central foam member 211 and one of the end foam members 212 is removed, and the pin 53 of the hinge 41 is pulled out. Thereafter, the top form 21 is lifted by the rope S at the central opening 25 in the same manner as in the first embodiment. This lifting causes the top form 21 to assume an arch shape, as shown in FIG. 18(b). The central stand 61 and end stands 63 are removed before the top form 21 is lifted. The receiving bracket 81 is removed at a timing between after the hook RF is released and before the top form 21 is lifted. The top form 21 is then assembled to the formwork device 11 in the same manner as in the first embodiment. In this manner, the top form 21 is handled and the formwork device 11 is constructed.

[0051] When dismantling the formwork device 11, the top form 21 is removed from the formwork device 11 and transported in the reverse order to that when the formwork device 11 is constructed. As described above, in this embodiment, the unit of the central foam member 211 and one of the end foam members 212 can be handled in the same way as in the first embodiment. Therefore, even if the top form 21 is large or the truck bed TR is small, this can contribute to shortening the construction period of the tunnel construction.

[0052] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. 19(a) and 19(b), focusing on the differences from the first embodiment.

[0053] In this embodiment, mounting pieces 71 are fixed to the end plates 28, 29 of the central foam member 211 and the end foam members 212, and hinge pieces 72 are supported on the mounting pieces 71 via shafts 73. The hinge pieces 72 are connected to each other by shafts 74. The mounting pieces 71, hinge pieces 72, etc. form hinges 70 between the central foam member 211 and the end foam members 212.

[0054] When the top form 21 is unfolded during construction or dismantling of the formwork device 11, a spacer 42 (not shown in this embodiment) is used, as in the first embodiment. At this time, the end plates 28, 29 are spaced apart, and the distance is determined by the hinge pieces 72 becoming linear. Therefore, the central form member 211 and the end form members 212 become flat and are prevented from further rotation. As a result, the top form 21 is maintained in an unfolded state in cooperation with the spacer 42 (not shown in FIG. 19).

[0055] When the top foam 21 is to be formed into an arch shape, the spacer 42 is removed and the arched state is maintained using metal fittings (not shown). Then, as shown in Figure 4, the central foam member 211 and the end foam members 212 are fixed together with bolts 31. Other handling is the same as in the previous embodiment.

[0056] (Example of change) The present invention is not limited to the above-described embodiment, and may be embodied in the following forms. The embodiment and the following modified examples may be combined with each other within the scope of technical inconsistency.

[0057] In the above embodiment, the present invention is implemented in both the construction and dismantling of the formwork apparatus 11, but the present invention may be implemented in either the construction or dismantling of the formwork apparatus 11. In other words, the present invention may be implemented in the construction of the formwork apparatus 11, but the foam members may not be connected by hinges when dismantling. Alternatively, the present invention may be implemented in the dismantling of the formwork apparatus 11, but the foam members may not be connected by hinges when constructing.

[0058] The present invention is applicable when the side form 22 or the invert form 23 is made up of multiple foam members. [Explanation of symbols]

[0059] 11...Formwork equipment 12...Support device 21...Heaven Form 41...hinge 42...Spacer 211...Central foam member 212...End foam member C...Lining concrete T...tunnel T1…ground TR…Truck bed

Claims

1. In the construction of a concrete formwork device for forming a tunnel lining concrete using forms on a support device installed on the ground of the tunnel, A method for handling forms in a concrete formwork device in which a plurality of form members constituting the form are handled in a state in which they are connected by hinges, comprising: The form is a top form that changes from an unfolded state to an arch shape through the rotation of the hinge, A method for handling forms in a concrete formwork device, comprising the steps of: fixing the top form in the arch shape; removing the hinge; and assembling the top form to the support device.

2. In dismantling a concrete formwork device that forms tunnel lining concrete using forms on a support device installed on the ground of a tunnel, A method for handling forms in a concrete formwork device in which a plurality of form members constituting the form are handled in a state in which they are connected by hinges, comprising: The form is a top form that changes from an arch shape to an expanded state through the rotation of the hinge, A method of handling forms in a concrete formwork device, in which the hinge is attached to the top form removed from the support device, the bolts that fixed the top form in the arch shape are removed, and the top form is returned to the expanded state.

3. A method for handling forms in a concrete formwork device as described in claim 1 or claim 2, wherein the top form is assembled to form the arch shape on the support device and is deployed outside the support device via the hinge.

4. 4. A method for handling forms in a concrete formwork device as described in claim 3, wherein the top form comprises a central form member and end form members connected to its end sides via the hinges, and when constructing the concrete formwork device, the central form member of the top form in an expanded state is pulled up to cause the top form to assume the arch shape via the rotation of the hinges.

5. 4. A method for handling forms in a concrete formwork device according to claim 3, wherein, in the expanded state of the top form, spacers are interposed between the form members constituting the top form to maintain the expanded state.

6. 4. The method for handling forms in a concrete formwork apparatus according to claim 3, wherein the hinge has a holding portion for holding the top form in the arch shape.

7. A method for handling forms in a concrete formwork device as described in claim 5, wherein the top form in the unfolded state is loaded onto the truck bed via a stand so that its longitudinal direction is aligned with the fore-and-aft direction of the truck bed, and transported by truck in that state.

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