Linkage for a concrete formwork arrangement and method for handling a concrete formwork arrangement

Abstract

To easily attach and detach a rod-like jack between the device frame of a concrete form device and the side form of a form unit.SOLUTION: A concrete form device 11 is provided with a device frame 12 installed on the ground E and a form unit 13 for forming the lining concrete C2 of the inner peripheral surface of a tunnel T. The form unit 13 has a side form 15 movable between an outer molding position and an inner position on the side of the apparatus frame 12. A link device 30 whose length between both ends can be expanded and contracted is provided between the device frame 12 and the side foam 15.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a concrete formwork device for forming tunnel lining concrete, and to a link device for the concrete formwork device and a method for operating the concrete formwork device. [Background technology]

[0002] As shown in Figures 1 and 2, a concrete formwork device 11 for forming lining concrete C2 on the inner periphery side (tunnel center side) of shotcrete C1 provided on the inner periphery surface of tunnel T has a gantry-shaped device frame 12. This device frame 12 is movably installed on rails R on the ground surface E of tunnel T by wheels 12a at its lower end. An arch-shaped form unit 13 is supported on the device frame 12 via girders 20 and the like so that it can be raised and lowered. Then, lining concrete C2 is poured between the shotcrete C1 on the inner wall surface of tunnel T and the outer periphery surface of the form unit 13, and is hardened and formed (see, for example, Patent Document 1).

[0003] The form unit 13 has a top form 14 located at the top of the arch, and side forms 15 rotatably connected to both circumferential ends of the top form 14 by shafts 17. An invert form 16 is rotatably connected to the lower end of the side form 15 by shaft 17. These forms 14, 15, 16 are arranged in groups along the extension direction of the tunnel T. Adjacent forms 14, 15, 16 in the extension direction of the tunnel T are connected to each other so as to be in a fixed relationship.

[0004] As shown in Figures 1 to 3, when assembling the concrete molding device for molding the lining concrete C2, each side form 15 and each invert form 16 are positioned on the device frame 12 side. Then, a rod jack 24 is interposed between the side wall 18 of the device frame 12 and each side form 15 and each invert form 16. Therefore, multiple rod jacks 24 are arranged side by side along the tunnel extension direction. Then, the rod jacks 24 are positioned so that, as they are extended by the action of the screws, the side forms 15 and invert forms 16 are pushed out toward the molding position of the lining concrete C2. Figures 1 to 3 only show the rod jacks 24 between the side wall 18 and the side form 15; the rod jacks between the side wall 18 and the invert form 16 are not shown. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-32808 Summary of the Invention [Problem to be solved by the invention]

[0006] 22 shows the concrete forming device during assembly, before the lining concrete C2 is poured, and shows a state in which the invert forms 16 and rod jacks 24 are not attached. In this state, the side forms 15 hang down from both ends of the top form 14 under their own weight. When pouring the lining concrete C2, the form unit 13 is placed in the raised position, and the side forms 15 are rotated to the outer forming position. After the lining concrete C2 has been poured, the rod jacks 24 are removed when the concrete formwork device is dismantled. Therefore, the form unit 13 including the side forms 15 is moved downward toward the device frame 12, and the side forms 15 are rotated so that they hang down from the top form 14.

[0007] Conventionally, these rotation operations have been performed manually, but because the side forms 15 are large and heavy, the operations have been difficult and time-consuming.

[0008] For example, when rotating the side forms 15 from their hanging positions to the molding position of the lining concrete C2, conventionally, a lever block (registered trademark) is fixed to the inner wall surface of the shotcrete C1 with an anchor. The lever block and the side forms are then connected by a chain. In this state, the lever block is manually operated, and manual force is applied directly to the side forms 15 via the chain. This causes the side forms to spread outward and rotate just before the molding position. In this state, a rod jack 24 is then interposed between the equipment frame 12 and the side forms 15, and the rod jack 24 is then extended by the action of a screw, moving the side forms 15 to the molding position of the lining concrete C2. Therefore, conventionally, the process of placing the rod jack 24 between the equipment frame 12 and the side forms 15 requires a lot of effort and time.

[0009] The invert form 16 is connected to the lower end of the side form 15 after the side form 15 has been moved to the molding position. [Means for solving the problem]

[0010] The link device of the present invention is characterized in that it has a pair of links connected at one end by a link shaft so that they can be opened and closed between an expanded state and a bent state, and the other ends of both links are provided with connecting sections that can be connected to the device frame and molding form of a concrete formwork device, so that the molding form moves closer to and away from the device frame as the two links are opened and closed.

[0011] Therefore, after the link device is placed between the equipment frame and the forming form, the link device is extended by unfolding the link device. Therefore, the forming form can be moved to the outer side, i.e., the forming position, which is the inner wall surface of the tunnel. This makes it easy to create a large space between the equipment frame and the forming form for inserting a rod jack. Furthermore, when dismantling the concrete formwork equipment, by placing the link device in an unfolded state between the equipment frame and the forming form, a large space can be maintained for removing the rod jack. After removing the rod jack, the link device is bent while applying a braking force in the bending direction to the link device, thereby contracting the overall length of the link device. Therefore, the forming form can be easily moved toward the equipment frame. This makes it easy to attach and detach the rod jack.

[0012] The method of operating the concrete formwork device of the present invention is a concrete formwork device comprising an equipment frame to be installed on the ground and a molding form for molding tunnel lining concrete, the molding form being movable between an outer molding position and a position on the equipment frame side, and characterized in that the link device is interposed between the equipment frame and the molding form, and then the side form is moved toward the molding position by pulling up the link shaft portion.

[0013] Here, the portion of the link shaft includes not only the link shaft itself but also the portion of the link shaft that is moved upward when a pulling force is applied. Therefore, by pulling up the link shaft portion via a rope or the like, the link device is deployed and extended. As a result, the molded form can be moved to the molding position without requiring human power, and the installation space for the rod jack can be easily created.

[0014] In addition, the method of handling the concrete formwork device of the present invention is a concrete formwork device comprising an equipment frame to be installed on the ground and a molding form for molding tunnel lining concrete, the molding form being movable between an outer molding position and a position on the equipment frame side, and is characterized in that the link device is interposed between the equipment frame and the molding form, and then the molding form is moved to the position on the equipment frame side by its own weight while applying a lifting force to the link shaft portion.

[0015] Here, the portion of the link shaft, as described above, includes not only the link shaft itself but also the portion of the link shaft that is moved upward when a pulling force is applied. Therefore, with the rod jack attached, the link device is attached between the equipment frame and the molded form. Then, after removing the rod jack, the molded form is allowed to move toward the equipment frame while applying a pulling force that acts as a braking force via a rope or the like, and the molded form can be easily moved to a position near the equipment frame without the need for human labor. [Effects of the Invention]

[0016] According to the present invention, it is possible to easily form a working space for attaching and detaching a rod jack. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 3 is a cross-sectional view showing the forming state of lining concrete in the concrete formwork device. [Figure 2] FIG. [Figure 3] FIG. 2 is an enlarged cross-sectional view of a portion of FIG. 1. [Figure 4] FIG. 10 is a perspective view of the link device in a linearly deployed state beyond the dead point in the assembled and used state. [Figure 5] 5 is a perspective view of the link device in an obtuse angle deployed state in a disassembled use state, viewed from the opposite direction to FIG. 4. [Figure 6] This shows a link device in an assembled and used state, where (a) is a front view of the bent state, (b) is a front view of the state before the link shaft crosses the dead point, and (c) is a front view of the state when the link device has crossed the dead point and is unfolded in a straight line. [Figure 7] 1A and 1B show a link device in a disassembled state for use, in which FIG. 1A is a front view showing the state in which it is deployed at an obtuse angle, and FIG. 1B is a front view showing the state in which it is bent. [Figure 8] 7A and 7B show the connection portion between the first link and the second link in the state of FIG. 6C, where (a) is an exploded, partially omitted front view, and (b) is the same partially omitted front view. [Figure 9] 7(a) shows the connection portion between the first link and the second link in the state of FIG. 7(a), where (a) is an exploded, partially omitted front view, and (b) is the same partially omitted front view. [Figure 10] FIG. 4 is a cross-sectional view showing a bracket portion of the link device. [Figure 11] 10 is a cross-sectional view showing a state in which a link device in a bent state is attached to a concrete formwork device before the lining concrete is formed. FIG. [Figure 12] FIG. 12 is an enlarged cross-sectional view of a portion of FIG. [Figure 13] 10 is a cross-sectional view showing the state in which the link device in a straight state is attached to the concrete formwork device before the lining concrete is formed. FIG. [Figure 14] FIG. 14 is an enlarged cross-sectional view of a portion of FIG. [Figure 15] 10 is a cross-sectional view showing the state in which the link device in the obtuse angle state is attached to the concrete formwork device when the concrete formwork device is dismantled. FIG. [Figure 16] FIG. 16 is an enlarged cross-sectional view of a portion of FIG. [Figure 17] 10A and 10B show the contraction and retraction configuration of the link pieces, where FIG. 10A is a front view showing the contracted state, and FIG. 10B is a front view showing the extended state. [Figure 18] 10 shows the extension and contraction configuration of the link pieces, where (a) is an oblique view of the first link piece, (b) is an oblique view of the first link piece from a different direction, and (c) is an oblique view of the second link piece. [Figure 19]1A and 1B show a link device with spacers attached, where FIG. 1A is a front view of the link device with spacers attached to both link pieces, and FIG. 1B is a front view of the link device with a spacer attached to one of the link pieces. [Figure 20] (a) to (c) are front views of spacers of different lengths, and (d) is a perspective view of the spacer. [Figure 21] FIG. 4 is a cross-sectional view of a spacer portion of the link device. [Figure 22] FIG. 2 is a cross-sectional view showing the concrete formwork device without the rod jack and link device attached. DETAILED DESCRIPTION OF THE INVENTION

[0018] (First embodiment) A first embodiment of the present invention will now be described with reference to the drawings. <Configuration of link device> First, the configuration of a link device of a first embodiment provided between the device frame 12 and the side forms 15 of the concrete form apparatus 11 shown in Figures 1 to 3 will be described. In this embodiment, the side forms 15 are formed forms. The concrete form apparatus 11 of this embodiment has the same configuration and function as the concrete form apparatus 11 of Figures 1 to 3.

[0019] As shown in Figures 4 and 5, the link device 30 has a first link 31 and a second link 32 that can be connected and separated and that can be opened and closed when connected. Details will be described later, but Figure 4 is a perspective view showing the link device 30 deployed in a straight line slightly beyond the dead point, as shown in Figure 6(c). Figure 5 is a perspective view showing the link device 30 deployed in an obtuse angle state, as shown in Figure 7(a). The states of Figures 4 and 6 show an assembled use state A when assembling the concrete formwork apparatus 11. The states of Figures 5 and 7 show a disassembled use state B when dismantling the concrete formwork apparatus 11.

[0020] The first link 31 and the second link 32 are separably connected at their opposing ends. A pair of connecting plates 34, 35 are fixed in a protruding state to each opposing end of the square pipe-shaped trunk 33 of the first link 31 and the second link 32. The connecting plates 34, 35 are overlapped with each other in the front-to-rear direction when connecting the first link 31 and the second link 32. In this embodiment, the direction perpendicular to the paper surface of FIGS. 6 to 9 is defined as the front-to-rear direction. A first connecting hole 36 and a second connecting hole 37 are formed at the top and bottom of the connecting plates 34, 35, respectively. As shown in FIGS. 8(a), (b) and 9(a), (b), the second connecting hole 37 is positioned protruding further in the link length direction than the first connecting hole 36.

[0021] 8(a), (b) and 9(a), (b), the first link 31 and the second link 32 are connected in one of two positions: a position where one is vertically aligned with the other, and a position where the other is vertically aligned. That is, in FIGS. 5, 7, and 9, the first link 31 is upside down relative to the second link 32 from the position shown in FIGS. 4, 6, and 8. In FIGS. 4, 6, and 8, the first connecting hole 36 and the second connecting hole 37 face each other. This state is referred to as the assembled use state A described above. In FIGS. 5, 7, and 9, the first connecting hole 36 and the second connecting hole 37 face each other front to back. This state is referred to as the disassembled use state B described above.

[0022] In the assembled use state A shown in Figures 4, 6(c), and 8(b), link shafts 38 serving as connectors are inserted into the upper second and first connecting holes 37 and 36, respectively, and lock pins 39 serving as locking means are inserted into the lower first and second connecting holes 36 and 37. In the disassembled use state B shown in Figures 5, 7(a), and 9(b), link shafts 38 serving as connectors are inserted into the upper pair of opposing first connecting holes 36, respectively, and lock pins 39 are inserted into the lower pair of opposing second connecting holes 37. As shown in Figures 6(c) and 7(a), when the lock pins 39 are inserted into the first and second connecting holes 36 and 37, the first link 31 and the second link 32 are fixed so as not to rotate. 6(a), (b), and 7(b), when the lock pin 39 is not inserted, the first link 31 and the second link 32 can rotate between an unfolded state and a bent state around the link shaft 38. That is, in both the assembled use state A and the disassembled use state B, when the first link 31 and the second link 32 are connected only by the link shaft 38, both links 31, 32 can rotate between an unfolded state and a bent state around the link shaft 38.

[0023] Due to the difference in the protruding positions of the first connecting hole 36 and the second connecting hole 37 in the link length direction, the link device 30 is extended to form a straight line in the deployed state in assembled use state A shown in Figures 4, 6(c), and 8(b). In this state, the link shaft 38 of the link device 30 slightly exceeds the dead point on the line L connecting the centers of the mounting holes 41 of the first link 31 and the second link 32. Furthermore, in the deployed state in disassembled use state B shown in Figures 5, 7(a), and 9(b), the link device 30 is extended at an obtuse angle close to a straight line.

[0024] 4 and 5, the link shaft 38 and the lock pin 39 have heads with diameters larger than their shafts. Rings 38a, 39a made of spring material are detachably attached to the ends of the link shaft 38 and the lock pin 39 opposite the heads to prevent the link shaft 38 and the lock pin 39 from spontaneously falling out of the connecting holes 36, 37. As shown in Fig. 4, a latch fitting 46 is attached to the link shaft 38 as a latch portion.

[0025] 4, 5 and 10, a pair of brackets 40 are fixed to the other ends of the first link 31 and the second link 32 with bolts and nuts 61, and each bracket 40 has a mounting hole 41. The brackets 40 form a connecting portion that can be connected to the device frame 12 and the side form 15.

[0026] As shown in FIGS. 4, 8(a), 8(b), and 9(a), 9(b), a stopper 43 is fixed to the end of the second link 32. As shown in FIGS. 6(c) and 8(b), when the link device 30 is deployed linearly slightly beyond the dead point in the assembled use state A, the stopper 43 abuts against the end of the connecting plate 34 of the first link 31. This prevents further rotation of the first link 31 and the second link 32. As shown in FIGS. 7(a) and 9(b), when the link device 30 is deployed at an obtuse angle in the disassembled use state B, the stopper 43 abuts against the end of the connecting plate 34 of the first link 31, preventing further rotation of the first link 31 and the second link 32 in a direction that widens the obtuse angle.

[0027] The trunks 33 of the first link 31 and the second link 32 are each provided with a plurality of holes 42 for weight reduction. <Method for handling a concrete formwork device using a link device> Next, a method of operating the concrete formwork device 11 using the link device 30 configured as above in this embodiment will be described.

[0028] <When assembling concrete formwork equipment> As shown in Figure 22, when assembling the concrete formwork device 11 and before pouring the lining concrete C2, the side forms 15 hang down under their own weight from the top forms 14 that have been fixed to the device frame 12 in advance. In this state, the side forms 15 are close to the side walls 18, and the gap between the side forms 15 and the side walls 18 of the device frame 12 is narrow.

[0029] 11 and 12, the link device 30 in the assembled use state A is interposed between the side wall 18 of the equipment frame 12, which is placed on the ground E, and the side form 15 at both ends of the side form 15 in the tunnel extension direction. In this case, the link device 30 is bent at a substantially acute angle as shown in FIG. 6(a), so that its overall length is contracted. That is, as shown in FIGS. 11 and 12, the mounting hole 41 at one end of the link device 30 in the bent contracted state is attached to the mounting hole (not shown) of the bracket 19 (see FIG. 3) of the mounting member 21 on the side wall 18 of the equipment frame 12 by the mounting pin 23. Also, the mounting hole 41 at the other end of the link device 30 is attached to the mounting hole (not shown) of the bracket 19 of the mounting member 21 of the side form 15 by the mounting pin 23.

[0030] As shown in FIGS. 6(a) and 12, a metal fitting 45, such as a hook, at the end of a rope 44 of a winch 26 mounted on the upper part of the apparatus frame 12 is hooked to a metal fitting 46 on the link shaft 38 of the link device 30. The winch 26 constitutes an external driving means, the metal fitting 45 constitutes the operating part, and the metal fitting 46 constitutes a connecting part that allows the operating part to be connected. The rope 44 is tensioned through a fixed pulley (not shown). Then, when the winch 26 is driven, the metal fitting 45 is pulled up via the rope 44, as shown by the arrows in FIGS. 6 and 12. As a result, the link shaft 38 of the link device 30 is pulled up via the metal fitting 46, and the first link 31 and the second link 32 are raised horizontally, as shown in FIGS. 6(b), 13, and 14. Note that the driving means may not be limited to the winch 26, but may be a manual or electric chain block installed somewhere other than the side form 15 of the concrete formwork apparatus 11.

[0031] As a result, the link device 30 is deployed, and the entire length of the link device 30 is extended from its contracted state. This extension tends to push both ends of the first link 31 and the second link 32 outward. However, because the side wall 18 is in a fixed position, only the side form 15 is moved outward. In this way, as shown in Figures 13 and 14, the side form 15 is positioned along the inner surface of the shotcrete C1, at a jack attachment / detachment position that allows the rod jack 24, described below, to be attached and detached. In this jack attachment / detachment position, the side form 15 is slightly spaced inward (toward the near side) from the position of the inner surface of the lining concrete C2 to be poured.

[0032] In this way, when the side form 15 reaches the jack attachment / detachment position, as shown in Figure 6(c), the link device 30 passes the dead point and becomes straight, and the lower part of the connecting plate 34 abuts against the stopper 43. Therefore, the first link 31 and the second link 32 are prevented from rotating further upward, and the link device 30 is stabilized in a straight state.

[0033] In this state, by inserting the lock pin 39 into the lower connecting holes 36, 37, the link device 30 is locked in a state where rotation is prevented. Therefore, this locking brings the side form 15 into a fixed state where it cannot rotate at the jack attachment / detachment position.

[0034] Next, the rod jacks 24 are attached between the side wall 18 and the brackets 19 of the side forms 15 in the areas where the link devices 30 are not attached. Next, the link devices 30 are removed. The link devices 30 are attached at both ends of the side forms 15 using the brackets 19 for the rod jacks 24, or are attached to the brackets 19 for the link devices 30. If the link devices 30 are attached to the brackets 19 for the rod jacks 24, the rod jacks 24 are attached to the same positions after the link devices 30 are removed. Then, the rod jacks 24 of the side forms 15 are extended by screwing, and the side forms 15 are moved to the casting position for the lining concrete C2. After that, the invert forms 16 are connected to the lower ends of the side forms 15.

[0035] In this state, the lining concrete C2 is poured between the shotcrete C1 and the form unit 13. After the lining concrete C2 hardens, the rod jack 24 is contracted by the action of the screw, so that the form unit 13 is separated from the molding surface of the lining concrete C2 and the entire form unit 13 is lowered. Then, in this state, the concrete form device 11 is moved on the rail R by the rolling of the wheels 12a toward the pouring position of the new lining concrete C2. At the pouring and molding position of the new lining concrete C2, the entire form unit 13 is raised, and then the rod jack 24 is extended by the action of the screw. Therefore, the form unit 13 is again positioned at the pouring and molding position of the lining concrete C2, so that the new lining concrete C2 can be poured and molded. In this way, the lining concrete C2 can be poured continuously along the extension direction of the tunnel T.

[0036] <When dismantling concrete formwork equipment> When dismantling the concrete formwork device 11 after the pouring of the lining concrete C2 for the tunnel T is completed, the invert form 16 and the rod jack (not shown) on the side of the invert form 16 are removed. Next, the rod jack 24 supporting the side form 15 is contracted by the action of a screw, thereby moving the side form 15 to the jack attachment / detachment position described above.

[0037] 15 and 16, the link device 30, in the disassembled and used state B shown in FIGS. 7(a) and 9(b) and in the obtuse-angle deployed state, is interposed between the brackets 19 of the side wall 18 and the side form 15 at both ends of the side form 15 in the extension direction of the tunnel T. The link device 30 is fixed in the obtuse-angle deployed state by the lock pin 39 and locked in this obtuse-angle deployed state by the engagement of the stopper 43 and the connecting plate 34. As described above, the link device 30 may be attached to the bracket 19 of the rod jack 24 after it has been removed, or may be attached to the bracket 19 for the link device 30. Next, the rod jack 24 is removed from between the side wall 18 and the side form 15 while contracting, leaving the link device 30 behind. In this way, the side form 15 is held in the jack attachment / detachment position by the fixed link device 30.

[0038] In this state, the metal fitting 45 of the rope 44 extending from the winch 26 is hooked onto the latching metal fitting 46. Then, while the winch 26 holds the link shaft 38 in a suspended state via the latching metal fitting 46, the lock pin 39 is removed. Next, the winch 26 applies a pulling force, i.e., a braking force, to the link shaft 38 as shown by the arrows in Figures 7(a) and 16, while moving the side form 15 toward the device frame while allowing it to move under its own weight. Therefore, the side form 15 gradually sags while being subjected to the braking action. This causes the link device 30 to assume the bent state shown in Figure 7(b). In this way, the side form 15 can be separated from the cast lining concrete C2. The link device 30 is then removed from the form unit 13.

[0039] Effects of the embodiment This embodiment has the following advantages. (1) A link device 30 that can be deployed and bent can be attached between the equipment frame 12 and the side forms 15. In this state, the rope 44 of a driving device such as a winch 26 is connected to the latch 46 of the link device 30. In this manner, the side forms 15 can be easily moved between the forming side position and the equipment frame 12 side position without relying on human power by deploying and bending the link device 30 using the power of the driving device. The link device 30 is held and locked in the deployed state by the dead point action, the pulling force of the driving device rope 44, and the lock pin 39. Therefore, the side forms 15 can be stably held in the outer moving position toward the forming position. This makes it easy to create a large and stable space between the equipment frame 12 and the side forms 15 for installing and removing the rod jacks 24. This facilitates the installation and removal of the rod jacks 24 inside the side forms 15. As a result, the concrete formwork apparatus 11 can be easily assembled and disassembled in a short time.

[0040] (2) In the assembled use state A, the link device 30 passes the dead point and is deployed linearly in a stable state in which rotation is restricted by the stopper 43. In this state, it is locked in a fixed state by the lock pin 39. Therefore, the load of the side form 15 is stably received by the link device 30, allowing the rod jack 24 to be properly attached.

[0041] (3) In the disassembled use state B, the link device 30 is deployed at an obtuse angle. In this state, it is locked in a fixed state by the lock pin 39. Therefore, the load of the side forms 15 is stably received by the link device 30, allowing the rod jack 24 to be properly removed. Moreover, because the contraction of the link device 30 due to the rotation of the side forms 15 toward the device frame 12 begins from an obtuse angle, the link device 30 can be smoothly rotated in the contracting direction without any strain.

[0042] (4) The side form 15 is moved to the molding position by using the winch 26 to pull up the link shaft 38 between the first link 31 and the second link 32 in the bent state. This allows the heavy side form 15 to be easily positioned at the molding position.

[0043] (5) The side form 15 can be moved toward the device frame 12 while applying an upward braking force by the winch 26 to the link shaft 38 between the first link 31 and the second link 32. Therefore, the heavy side form 15 can be moved inward easily and at an appropriate speed.

[0044] (6) The link device 30 has a simple configuration in which one end of the first link 31 and one end of the second link 32 are rotatably connected by the link shaft 38. Therefore, the risk of malfunction of the link device 30 can be reduced.

[0045] (7) The positions of the connecting holes 36, 37 of the first link 31 and the second link 32 in the link device 30 are different in the longitudinal direction of the first link 31 and the second link 32. Therefore, by turning the first link 31 upside down relative to the second link 32, the link device 30 can be positioned and held in two extended positions, a straight line and an obtuse angle, without changing the positions of the link shaft 38 and the lock pin 39. Therefore, the link device 30 is easy to handle.

[0046] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 17(a), (b) and 18(a) to (c), focusing on the differences from the first embodiment.

[0047] In this embodiment, one or both of the first link 31 and the second link 32 are configured with a telescopic structure, so that the length of one or both of them can be extended or contracted by sliding. Figures 17 and 18 show an example in which the length of both the first link 31 and the second link 32 can be extended or contracted.

[0048] The first and second links 31 and 32 each have a rectangular cylindrical outer link piece 31a, 32a. The first and second links 31 and 32 each have a rectangular cylindrical inner link piece 31b, 32b inserted into the outer link piece 31a, 32a through the end opening of the outer link piece 31a, 32a so as to be slidable in the extension direction. Therefore, the outer link pieces 31a, 32a and the inner link pieces 31b, 32b form the telescopic structure as a length adjustment means. The outer link pieces 31a, 32a have connecting plates 34, 35, and the inner link pieces 31b, 32b have a bracket 40. A pair of holes 51 is formed at each of the open end portions of the outer link pieces 31a, 32a at two locations along the extension direction of the outer link pieces 31a, 32a. A pair of holes 52 is formed at each of five locations along approximately the entire length of the inner link pieces 31b, 32b. Then, connecting pins 53 are inserted into the two pairs of matching holes 51, 52. This allows the overall lengths of the first link 31 and the second link 32 to be adjusted in multiple stages, and can be fixed in the adjusted state.

[0049] Although not shown, either the first link 31 or the second link 32 may be made to have a telescopic structure so that only one of them can be extended or contracted. Therefore, this embodiment has the following advantages.

[0050] (1) Since the length of one or both of the first link 31 and the second link 32 can be adjusted, it is possible to easily accommodate differences in the size and type of concrete formwork device 11 and the spacing between the device frame 12 and the form unit 13.

[0051] (2) Holes 51 are formed at two locations along the length of the outer link pieces 31a, 32a, and holes 52 are formed at five locations along almost the entire length of the inner link pieces 31b, 32b. A connecting pin 53 is inserted into each of the two matching pairs of holes 51, 52. Therefore, the lengths of the first link 31 and the second link 32 can be adjusted in multiple steps, which is the product of the number of positions of the holes 51, 52 in the inner link piece 32b and the outer link piece 32a. Therefore, even if the number of positions of the holes 51, 52 is small, multiple-step adjustment is possible.

[0052] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. 19(a), (b), 20(a) to (d) and 21, focusing on the differences from the first embodiment.

[0053] In this embodiment, a spacer 60 is detachably interposed between one or both of the link pieces 31b, 32b and the bracket 40 via a bolt and nut 61. As shown in Figures 20(a) to (d), a plurality of spacers 60 are prepared, each with a different length in the extension direction of the link pieces 31b, 32b. The spacer 60 has one or more holes 62 for weight reduction. In this embodiment, the spacer 60 and the bolt and nut 61 etc. constitute a length adjustment means.

[0054] Therefore, this embodiment has the following effects. (1) A spacer 60 of an appropriate length can be interposed between one or both of the link pieces 31b, 32b and the bracket 40. This makes it possible to accommodate differences in the distance between the equipment frame 12 and the form unit 13 due to differences in the size and type of the concrete formwork equipment 11.

[0055] (2) By providing the spacer 60 with a simple shape, the length of the link device 30 can be easily adjusted. (Example of change) The present invention is not limited to the above-described embodiments, and may be embodied in the following forms.

[0056] In the above-described embodiments, the link device 30 is configured to exceed the dead point when the link device 30 is in the assembled and used state A. In contrast, the link device 30 is configured to unfold linearly without exceeding the dead point when the link device 30 is in the assembled and used state A.

[0057] When assembling the concrete formwork apparatus 11, the linkage device 30 needs to remain attached even after the rod jacks 24 are attached, without being removed from the concrete formwork apparatus 11. In this case, it is necessary to provide clearance in the linkage device 30 and between the linkage device 30 and the side form 15 to allow slight movement of the side form 15 so that the side form 15 can move between the position shown in Figure 14 and the molding position.

[0058] By combining the configurations of the second embodiment and the third embodiment, in addition to the function of length adjustment by the holes 51 and 52, the function of length adjustment by the presence or absence of the spacer 60 can be realized. In this way, the length can be adjusted in small increments.

[0059] The configuration of the first link 31 and the second link 32 of the link device 30 may be changed. For example, the first link 31 and the second link 32 may be made of a bar material or a round pipe material. In each of the above embodiments, a lifting force is applied to the link device 30 via the rope 44, but the same action can be exerted on the link device 30 by applying a pushing force to push up the link shaft 38 from below using an electric jack or the like. Therefore, in this case, the rope 44 and the latching metal fitting 46 for latching the rope 44 are not required. Also, if the load acting on the link device 30 from the side form 15 is borne by the electric jack, it is possible to omit a locking means such as the lock pin 39 in the link device 30.

[0060] In each of the above embodiments, the second connecting holes 37 of both the first and second links 31, 32 are positioned at positions that protrude from the first connecting hole 36 in the link length direction, but the second connecting hole 37 of only one of the links 31, 32 may be positioned at a position that protrudes from the connecting hole 36.

[0061] In the above-described embodiments, the metal latch 46 constituting the latch portion is provided on the link shaft 38, but the latch portion may be, for example, a hole or protrusion formed on the first and second links 31 and 32. The cable 44 of the drive means is therefore latched onto this protrusion or hole. The latch portion is provided at a position on the first link 31 or second link 32 near the link shaft 38, or at a location where the link shaft 38 rises when a pulling force is applied by the drive means.

[0062] In the above-described embodiments, the side form 15 is moved by the link device 30, but the invert form 16 may be moved in the same manner. Therefore, in this case, the invert form 16 becomes the molded form.

[0063] (Other technical ideas) The technical ideas grasped from the above-described embodiments are as follows. A concrete formwork device comprising an equipment frame to be installed on the ground and a molding form for molding tunnel lining concrete, the molding form being movable between an outer molding position and a position on the equipment frame side, with the link device 30 interposed between the equipment frame and the form.

[0064] Therefore, in this concrete formwork device, the forming form can be moved to the forming position side and the device frame side position without requiring human power by operating the link device, so that the rod jack can be easily attached and detached. [Explanation of symbols]

[0065] 11...Concrete formwork equipment 12...Device frame 13...Foam unit 15...Side Form 18...Side wall 24...Bar jack 30...Link device 31...1st link 32...Second link 36...Connection hole 37...Connection hole 38...Link shaft 39...Lock pin 43...Rock section 44... C2: Lining concrete E…ground T...tunnel

Claims

1. A link device for a concrete formwork device has a pair of links connected at one end by a link shaft so that they can be opened and closed between an expanded state and a bent state, and the other ends of both links are provided with connecting parts that can be connected to the device frame and molding form of a concrete formwork device, so that the molding form moves closer to and away from the device frame as the two links are opened and closed.

2. 2. A link device for a concrete formwork device according to claim 1, wherein said link shaft is provided with a hook portion for hooking a rope.

3. 2. A link device for a concrete form apparatus according to claim 1, wherein said link device is configured to exceed a dead point in said expanded state, and is locked in said expanded state beyond said dead point by a locking means.

4. A link device for a concrete formwork device as described in claim 3, wherein both links are provided with a first connecting hole into which the link shaft is inserted and a second connecting hole into which a lock pin constituting the locking means is inserted, and in at least one of the links, one of the first connecting hole and the second connecting hole protrudes further in the length direction of the link than the other.

5. 2. A link device for a concrete form apparatus according to claim 1, wherein at least one of said links is provided with length adjusting means for adjusting the length of said link.

6. A concrete formwork device comprising an equipment frame to be installed on the ground and a molding form for molding tunnel lining concrete, the molding form being movable between an outer molding position and an inner position on the equipment frame side, A method for handling a concrete formwork device, comprising: interposing a link device described in any one of claims 1 to 5 between the device frame and the forming form; and then lifting up the link shaft portion to move the forming form toward the forming position.

7. A method for handling a concrete formwork device as described in claim 6, wherein, when the side form of the concrete formwork device has been moved to a position on the molding position side, a rod-shaped jack is interposed between the device frame and the molding form instead of the link device, and then the rod-shaped jack is extended to move the molding form to the molding position.

8. A concrete formwork device comprising an equipment frame to be installed on the ground and a molding form for molding tunnel lining concrete, the molding form being movable between an outer molding position and an inner position on the equipment frame side, A method for handling a concrete formwork device, in which a link device described in any one of claims 1 to 5 is interposed between the device frame and the forming form, and then the forming form is moved to a position on the device frame side by its own weight while applying a lifting force to the link shaft portion.

9. 9. A method for handling a concrete formwork device as described in claim 8, wherein, when the forming form has been moved to the forming position, the link device in an expanded state is interposed between the device frame and the forming form, the forming form is held by the link device, the rod-shaped jack between the device frame and the forming form is removed, and then the forming form is moved to a position on the device frame side while applying a braking force to the link device.

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