Mounting auxiliary tool, expansion device, and method for installing expansion device

Abstract

To provide a mounting auxiliary tool, an expansion device and an installation method of the expansion device, capable of adjusting a relative position relation of a joint without dislocation at an end part of the expansion device, even if a fixing direction of the mounting auxiliary tool and an expansion direction of a bridge girder do not coincide, regardless of an installation direction of the expansion device.SOLUTION: A mounting auxiliary tool 20 is used for an expansion device 10 including a first joint 11 and a second joint 12 opposite to the first joint 11. The mounting auxiliary tool 20 regulates the movement of a first main body 21 fixed to the first joint 11, a second main body 22 fixed to the second joint 12, the first joint 11, and the second joint 12 in a vertical direction Z to maintain a height, an adjustment connection part 23 relatively movably connected in a longitudinal direction X of the expansion device 10 and in a perpendicular direction Y to the longitudinal direction X of the expansion device 10 from the first joint 11 to the second joint 12.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an installation aid, an extension device, and an installation method for an extension device. [Background technology]

[0002] In bridges, elevated roads (including walkways), etc., gaps are provided between girders or between girders and abutments because the bridge girders expand and contract due to changes in environmental temperature. Expansion devices are installed to span these gaps, absorbing fluctuations in the gap distance caused by expansion and contraction of the bridge girders due to temperature changes and deflection of the bridge girders due to the passage of vehicles, while maintaining flatness to allow vehicles and people to pass smoothly.

[0003] As such an expansion device, a technology has been disclosed that includes a pair of joints and a sealing layer provided between the joints (for example, Patent Document 1). The joint has a surface portion exposed to the bridge girder and a web portion formed integrally with the surface portion at the end of the bridge girder.

[0004] Expansion devices must be attached to the end of a bridge girder so that the distance and height between the pair of joints do not deviate depending on the gap conditions. Expansion devices are fixed in advance at a factory so that the distance between the pair of joints is, for example, a standard design width (a width determined by taking into account the amount of expansion and contraction of the bridge from the average temperature at the construction site) and so that the relative positional relationship of the pair of joints does not deviate. However, because the gap changes depending on the temperature, the distance between the pair of joints must be readjusted at the construction site as necessary, for example, if the temperature at the construction site differs from the expected temperature. To enable this readjustment, an installation aid has been disclosed that includes a pair of guide members that are temporarily fixed to the pair of joints, and a connecting means that connects the guide members so that the surface portions of the joints are flush with each other and allows the expansion device to move relative to the direction of expansion and contraction of the bridge girder, thereby restricting the direction of relative movement of the joints (e.g., Patent Document 2). The installation aid is removed after the joint is installed at the end of the bridge girder. Since the relative positional relationship of the pair of surface portions is not deviated vertically or horizontally, the gap between the joints can be easily and accurately adjusted. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-100150 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-052610 Summary of the Invention [Problem to be solved by the invention]

[0006] However, to readjust the joints using this installation aid, the installation aid restricts the relative movement of the joints that make up the expansion device, so the fixing direction of the installation aid (the direction restricting the relative movement of the joints) must be precisely aligned with the expansion / contraction direction of the expansion device (the direction of expansion / contraction of the bridge girder). Without precise alignment, misalignment occurs between the joints at the longitudinal ends of the expansion device when the joints are readjusted. If there is misalignment between the joints at the ends of the expansion device, if the gap changes due to expansion / contraction of the bridge girder, the end of the expansion device may interfere with the decking, etc., not only impeding the movement of the expansion device but also potentially damaging it. For example, when installing an expansion device in the gap of a skewed bridge girder with a non-90-degree oblique angle, the installation direction of the expansion device (the longitudinal direction of the expansion device) is not perpendicular (90 degrees) to the expansion / contraction direction of the bridge girder, but is oblique. Therefore, the installation aid must also be fixed at an angle, not perpendicular (90 degrees), to the longitudinal direction of the expansion device (the installation direction of the expansion device). The oblique angle varies from bridge to bridge, and the installation direction of the expansion device (the angle relative to the bridge girder's extension direction) changes depending on the oblique angle. Therefore, the fixing direction of the mounting support device must be adjusted each time depending on the oblique angle. In other words, the mounting support device must be installed at an angle relative to the longitudinal direction of the expansion device (the installation direction of the expansion device). It is difficult to precisely align it with the extension direction of the expansion device. Since the fixing direction (the angle) changes (is not constant) depending on the installation direction of the expansion device, the work becomes extremely complicated and labor-intensive. Furthermore, depending on the conditions at the construction site (where the expansion device is installed), the fixing direction of the mounting support device and the extension direction of the bridge girder may not match. In such cases, because the fixing direction of the mounting support device is restricted, it is difficult to correct the discrepancy between the fixing direction of the mounting support device and the current extension direction of the bridge girder.

[0007] The present invention aims to provide an installation aid, an expansion device, and an installation method for an expansion device that can adjust the relative positional relationship of joints without misalignment at the end of the expansion device, regardless of the installation direction of the expansion device, even if the fixing direction of the installation aid does not match the extension direction of the bridge girder. [Means for solving the problem]

[0008] An installation aid according to one aspect of the present invention is an installation aid used for an extension device having a first joint and a second joint opposite the first joint, and comprises a first main body fixed to the first joint, a second main body fixed to the second joint, and an adjustable connecting part that restricts vertical movement between the first joint and the second joint to maintain their height and connects them so as to be freely movable relative to each other in the longitudinal direction of the extension device and in a direction perpendicular to the longitudinal direction from the first joint to the second joint.

[0009] The extension device according to one aspect of the present invention is provided with the attachment aid.

[0010] A method for installing an expansion device according to one aspect of the present invention includes the steps of: fixing the first body to the first joint using the installation auxiliary tool; fixing the second body to the second joint; connecting the first body and the second body with the adjustable connecting part; moving the first joint and the second joint relatively in the perpendicular direction while maintaining their height; and moving the first joint and the second joint relatively in the longitudinal direction while maintaining their height. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide an installation aid, an expansion device, and an installation method for an expansion device that can adjust the relative positional relationship of the joints without misalignment at the end of the expansion device, regardless of the installation direction of the expansion device, even if the fixing direction of the installation aid does not match the extension direction of the bridge girder. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a plan view showing the overall configuration of the attachment aid according to the first embodiment attached to the extension device. [Figure 2] The left figure is a plan view of the mounting aid according to the first embodiment attached to the extension device, and the right figure is a right side view of the mounting aid according to the first embodiment attached to the extension device. [Figure 3] FIG. 2 is a rear view of the mounting aid according to the first embodiment mounted on the extension device. [Figure 4] FIG. 2 is a front view of the attachment aid according to the first embodiment attached to the extension device. [Figure 5] FIG. 3 is a cross-sectional view taken along the arrow a in FIG. 2. [Figure 6] The upper figure is a plan view of the mounting aid according to the first embodiment, the lower figure is a right side view of the mounting aid according to the first embodiment, and the right figure is a rear view of the mounting aid according to the first embodiment. [Figure 7] FIG. 2 is a rear view of the mounting parts that make up the mounting aid according to the first embodiment. [Figure 8] The left figure is a right side view of the first main body constituting the mounting aid according to the first embodiment, and the right figure is a rear view of the first main body constituting the mounting aid according to the first embodiment. [Figure 9] The upper figure is a right side view of the second main body constituting the mounting aid according to the first embodiment. The lower figure is a bottom view of the second main body constituting the mounting aid according to the first embodiment. The right figure is a rear view of the second main body constituting the mounting aid according to the first embodiment. [Figure 10]

[0033] Figures explaining adjustment of an extension device in a narrow gap using an installation aid according to the first embodiment. The top figure is a plan view and a rear view of the extension device in a standard state set at the standard width. The middle figure is a plan view and a rear view of the extension device in a narrow width state narrowed in the perpendicular direction from the standard state. The bottom figure is a plan view and a rear view of the extension device in a state adjusted in the longitudinal direction from the narrow width state. [Figure 11]

[0033] Figures explaining the adjustment of an extension device with a wide gap using an installation aid according to the first embodiment. The top figure is a plan view and a rear view of the extension device in a standard state set at the standard width. The middle figure is a plan view and a rear view of the extension device in an expanded state expanded in a perpendicular direction from the standard state. The bottom figure is a plan view and a rear view of the extension device in a state adjusted in the longitudinal direction from the expanded state. [Figure 12]The upper figure is a plan view of the mounting aid according to the first modified example of the first embodiment. The lower figure is a right side view of the mounting aid according to the first modified example of the first embodiment. The right figure is a rear view of the mounting aid according to the first modified example of the first embodiment. [Figure 13] FIG. 10 is a rear view of the attachment parts that make up the attachment aid according to Modification 1 of the first embodiment. [Figure 14] The upper figure is a plan view of the mounting aid according to Modification 2 of the first embodiment. The lower figure is a right side view of the mounting aid according to Modification 2 of the first embodiment. The right figure is a rear view of the mounting aid according to Modification 2 of the first embodiment. [Figure 15] FIG. 10 is a rear view of the hexagon bolt that constitutes the mounting aid according to the second modification of the first embodiment. [Figure 16] The upper figure is a plan view of the mounting aid according to Modification 3 of the first embodiment. The lower figure is a right side view of the mounting aid according to Modification 3 of the first embodiment. The right figure is a rear view of the mounting aid according to Modification 3 of the first embodiment. [Figure 17] FIG. 11 is a rear view of the attachment parts that make up the attachment aid according to the third modified example of the first embodiment. [Figure 18] The upper figure is a plan view of the mounting aid according to the fourth modification of the first embodiment. The lower figure is a right side view of the mounting aid according to the fourth modification of the first embodiment. The right figure is a rear view of the mounting aid according to the fourth modification of the first embodiment. [Figure 19] FIG. 11 is a rear view of the attachment parts that make up the attachment aid according to the fourth modified example of the first embodiment. [Figure 20] The upper figure is a plan view of the mounting aid according to the fifth modified example of the first embodiment. The lower figure is a right side view of the mounting aid according to the fifth modified example of the first embodiment. The left figure is a front view of the mounting aid according to the fifth modified example of the first embodiment. The right figure is a rear view of the mounting aid according to the fifth modified example of the first embodiment. [Figure 21] FIG. 11 is a rear view of the first attachment part constituting the attachment aid according to the fifth modified example of the first embodiment. [Figure 22] FIG. 11 is a front view of a second attachment part that constitutes an attachment aid according to a fifth modified example of the first embodiment. [Figure 23] The upper figure is a plan view of the mounting aid according to the second embodiment. The lower figure is a right side view of the mounting aid according to the second embodiment. The left figure is a front view of the mounting aid according to the second embodiment. The right figure is a back view of the mounting aid according to the second embodiment. [Figure 24] The upper figure is a plan view of the mounting aid according to the third embodiment. The lower figure is a right side view of the mounting aid according to the third embodiment. The left figure is a front view of the mounting aid according to the third embodiment. The right figure is a rear view of the mounting aid according to the third embodiment. [Figure 25] The upper figure is a plan view of the mounting aid according to the first modified example of the third embodiment. The lower figure is a right side view of the mounting aid according to the first modified example of the third embodiment. The left figure is a front view of the mounting aid according to the first modified example of the third embodiment. The right figure is a back view of the mounting aid according to the first modified example of the third embodiment. [Figure 26] The upper figure is a plan view of the mounting aid according to Modification 2 of the third embodiment when being adjusted. The lower figure is a right side view of the mounting aid according to Modification 2 of the third embodiment when being adjusted. The left figure is a front view of the mounting aid according to Modification 2 of the third embodiment when being adjusted. The right figure is a back view of the mounting aid according to Modification 2 of the third embodiment when being adjusted. [Figure 27] These are diagrams explaining the adjustment of an extension device with a wide gap using an installation aid according to the third embodiment. The top figure is a plan view of the extension device in a standard state set at the standard width. The middle figure is a plan view of the extension device in an expanded state expanded in the perpendicular direction from the standard state. The bottom figure is a plan view of the extension device in a state adjusted in the longitudinal direction from the expanded state. [Figure 28] The upper figure is a plan view of the mounting aid according to Modification 3 of the third embodiment. The lower figure is a right side view of the mounting aid according to Modification 3 of the third embodiment. The left figure is a front view of the mounting aid according to Modification 3 of the third embodiment. The right figure is a back view of the mounting aid according to Modification 3 of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] (First embodiment) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing the overall configuration of an attachment aid 20 according to a first embodiment attached to an extension device 10. The left view of FIG. 2 is a plan view of the attachment aid 20 according to the first embodiment attached to an extension device 10. The right view of FIG. 2 is a right side view of the attachment aid 20 according to the first embodiment attached to an extension device 10. FIG. 3 is a rear view of the attachment aid 20 according to the first embodiment attached to an extension device 10. FIG. 4 is a front view of the attachment aid 20 according to the first embodiment attached to an extension device 10. FIG. 5 is a cross-sectional view taken along arrow a in FIG. 2. The upper view of FIG. 6 is a plan view of the attachment aid 20 according to the first embodiment. The lower view of FIG. 6 is a right side view of the attachment aid 20 according to the first embodiment. The right view of FIG. 6 is a rear view of the attachment aid 20 according to the first embodiment. FIG. 7 is a rear view of an attachment part 231 constituting the attachment aid 20 according to the first embodiment. The left view of FIG. 8 is a right side view of the first main body 21 constituting the attachment aid 20 according to the first embodiment. The right view of Fig. 8 is a rear view of the first main body 21 that constitutes the mounting aid 20 according to the first embodiment. The top view of Fig. 9 is a right side view of the second main body 22 that constitutes the mounting aid 20 according to the first embodiment. The bottom view of Fig. 9 is a bottom view of the second main body 22 that constitutes the mounting aid 20 according to the first embodiment. The right view of Fig. 9 is a rear view of the second main body 22 that constitutes the mounting aid 20 according to the first embodiment. Note that, hereinafter, parts having common functions may be given the same reference numerals or symbols.

[0014] (Expansion device) As shown in Fig. 1, the expansion device 10 according to this embodiment is installed in the gap between adjacent bridge girders G that make up a bridge. The expansion device 10 may also be installed in the gap between a bridge girder G and an abutment. The gap varies depending on factors such as changes in environmental temperature and the size of live loads such as vehicles.

[0015] The expansion device 10 is provided along the bridge axis direction end of the bridge girder G. The expansion device 10 has a length that follows the bridge axis direction end of the bridge girder G (the portion facing the joint gap). For example, in cases where the bridge axis direction end is not aligned with the direction perpendicular to the bridge axis B, such as in the case of a bridge girder G on a skew bridge, the expansion device 10 has a length that is longer than the width of the bridge girder G (the length in the direction perpendicular to the bridge axis B). For example, in cases where the bridge axis direction end is aligned with the direction perpendicular to the bridge axis B, such as in the case of a bridge girder G on a straight bridge, the expansion device 10 has a length equivalent to the width of the bridge girder G.

[0016] The telescopic device 10 may be configured by assembling parts that are divided in the longitudinal direction X of the telescopic device 10. For example, as shown in Fig. 1, the telescopic device 10 is configured by assembling a first telescopic device 10A and a second telescopic device 10B that are divided into two parts in the longitudinal direction X of the telescopic device 10 via a device connecting part 30.

[0017] The end 14 of the extension device 10 in the longitudinal direction X is aligned with the extension direction of the bridge girder G. In other words, the end 14 of the extension device 10 in the longitudinal direction X is aligned in a desired state with respect to the side edge of the bridge girder G, in accordance with the angle θ between the extension direction of the bridge girder G and the perpendicular direction Y relative to the longitudinal direction X of the extension device 10. For example, in a plan view, the extension device 10 can be installed at the installation location so that the side edge of the bridge girder G and the end 14 of the extension device 10 in the longitudinal direction X (the end of the first joint 11 in the longitudinal direction X and the end of the second joint 12 in the longitudinal direction X) are aligned on a straight line. This does not hinder the movement of the extension device 10 even if the gap fluctuates along the extension direction of the bridge girder G while the bridge is in service. If the end 14 of the extension device 10 in the longitudinal direction X is not aligned with the extension direction of the bridge girder G, when the gap moves along the extension direction of the bridge girder G, the extension device 10 may interfere with the ground cover (not shown) or the like, which not only hinders the movement of the extension device 10 but may also cause it to be damaged.

[0018] The expansion device 10 includes a first joint 11 and a second joint 12 facing the first joint 11. The expansion device 10 also includes anchors 13 provided at the first joint 11 and the second joint 12. The expansion device 10 is made of, for example, steel.

[0019] The first joint 11 and the second joint 12 are provided facing each other with a gap between them. The first joint 11 and the second joint 12 are each provided along the bridge axis direction end of the bridge girder G. The first joint 11 and the second joint 12 have a length that follows the bridge axis direction end of the bridge girder G. As shown in FIGS. 2 to 6 , the first joint 11 includes a plate-shaped side surface 112 extending in the longitudinal direction X and the vertical direction Z, and a plate-shaped upper surface 111 that is integrally formed at the upper end of the side surface 112 and extends in the longitudinal direction X and the perpendicular direction Y. The second joint 12 includes a plate-shaped side surface 122 extending in the longitudinal direction X and the vertical direction Z, and a plate-shaped upper surface 121 that is integrally formed at the upper end of the side surface 122 and extends in the longitudinal direction X and the perpendicular direction Y.

[0020] 2 to 5, the first joint 11 and the second joint 12 are arranged so that their upper surfaces 111, 121 overlap in the vertical direction Z along the longitudinal direction X. In this embodiment, a partial area of ​​the upper surface 111 of the first joint 11 is arranged to overlap a partial area of ​​the upper surface 121 of the second joint 12. Note that the extension device 10 may have a structure (tooth joint structure) in which the first joint 11 and the second joint 12 are each provided with repeated concave and convex portions in the perpendicular direction Y along the longitudinal direction X, and are arranged to interlock with each other rather than overlap in the vertical direction Z.

[0021] As shown in Figures 2 and 5, the expansion device 10 has a waterproofing member S that covers the lower part of the space formed between the first joint 11 and the second joint 12. The waterproofing member S is made of, for example, an elastic sealing material. The waterproofing member S may be a dry waterproofing material. A secondary waterproofing material, such as a backup material such as urethane foam or a rubber gutter, may be provided below the elastic sealing material. As shown in Figure 6, a dustproof layer S2 is provided in the space between the upper surface 111 of the first joint 11, which is disposed on the upper surface 121 of the second joint 12, and the waterproofing member S. The dustproof layer S2 is made of, for example, an elastic foam such as urethane foam or EPDM foam.

[0022] The anchor 13 is provided at each of the first joint 11 and the second joint 12. One end of the anchor 13 is connected to the first joint 11 or the second joint 12, and the other end is connected to the bridge axis direction end of the bridge girder G. The anchor 13 is, for example, embedded and fixed in concrete that constitutes the bridge axis direction end of the bridge girder G. The anchor 13 extends in the perpendicular direction Y. In other words, the anchor 13 extends in a direction perpendicular to the longitudinal direction X of each of the first joint 11 and the second joint 12. The anchor 13 is, for example, a reinforcing bar.

[0023] (Installation aids) 6 to 9, the installation auxiliary tool 20 is used in the expansion device 10. The installation auxiliary tool 20 is attached to the expansion device 10 in a state in which it is arranged so as to straddle the first joint 11 to the second joint 12.

[0024] Here, the installation auxiliary tool 20 attached to the expansion device 10 is arranged along the perpendicular direction Y. The installation auxiliary tool 20 includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the expansion device 10 and in the perpendicular direction Y (the direction from the first joint 11 to the second joint 12) to the longitudinal direction X of the expansion device 10. This makes it possible to adjust the relative positional relationship between the first joint 11 and the second joint 12 not only in the perpendicular direction Y but also in the longitudinal direction X while maintaining their height in the vertical direction Z. In other words, regardless of the installation direction of the expansion device 10, the relative positional relationship of the joints can be adjusted even if the fixing direction of the installation auxiliary tool 20 does not coincide with the extension direction of the bridge girder G. Therefore, even if the target for installing the expansion device 10 is a skew bridge in which the gap (the relative positional relationship between the first joint 11 and the second joint 12) is displaced not only one-dimensionally in the perpendicular direction Y but also two-dimensionally in the perpendicular direction Y and the longitudinal direction X from the standard design position due to, for example, the temperature at the construction site, the use of the attachment aid 20 allows fine adjustment of the relative positional relationship between the first joint 11 and the second joint 12 to match the gap at the construction site, and also aligns the end 14 of the expansion device 10 in the longitudinal direction X with the expansion direction of the bridge girder G. Therefore, even if the gap fluctuates during bridge operation, the movement of the expansion device 10 installed in the gap is not hindered. Furthermore, since the fixing direction of the attachment aid 20 to the expansion device 10 does not need to be aligned with the expansion direction of the bridge girder G, it can always be aligned in the same direction regardless of the installation direction of the expansion device 10, making the work of fixing the attachment aid 20 to the expansion device 10 easier.

[0025] (Adjusting the relative position between the first and second joints) The method of adjusting the relative positional relationship between the first joint 11 and the second joint 12 to match the joint gap at the construction site using the installation aid 20 of the first embodiment will be explained using Figures 10 and 11.

[0026] FIG. 10 is a diagram illustrating adjustment of the extension device 10 in a narrow gap using the installation aid 20 according to the first embodiment. Reference numeral 1051 in the upper diagram is a plan view and a rear view of the extension device 10 in a standard state set at the standard width. Reference numeral 1052 in the middle diagram is a plan view and a rear view of the extension device 10 in a narrow-width state narrowed in the perpendicular direction Y from the standard state. Reference numeral 1053 in the lower diagram is a plan view and a rear view of the extension device 10 in a state adjusted in the longitudinal direction X from the narrow-width state. FIG. 11 is a diagram illustrating adjustment of the extension device 10 in a wide gap using the installation aid 20 according to the first embodiment. Reference numeral 1061 in the upper diagram is a plan view and a rear view of the extension device 10 in a standard state set at the standard width. Reference numeral 1062 in the middle diagram is a plan view and a rear view of the extension device 10 in an expanded state widened in the perpendicular direction Y from the standard state. The reference numeral 1063 in the lower diagram is a plan view and a rear view of the extension device 10 in a state adjusted in the longitudinal direction X from the widened state.

[0027] As shown by reference numeral 1051 in the upper diagram of Figure 10, for example, at the time of delivery to the construction site, the expansion device 10 is in a standard state in which the relative positional relationship between the first joint 11 and the second joint 12 is set to a standard width that matches the standard design position of the gap by the installation auxiliary tool 20. At this time, the end portions 14 of the expansion device 10 in the longitudinal direction X are aligned on a straight line in a plan view.

[0028] If the actual joint gap at the construction site is narrower than the standard design position, as shown by reference numeral 1052 in the middle diagram of Figure 10, the installation aid 20 is used to move the first joint 11 and the second joint 12 of the expansion device 10 closer together, thereby narrowing the width from the standard state in the perpendicular direction Y. At this time, the end 14 of the expansion device 10 in the longitudinal direction X is no longer aligned in a straight line in plan view.

[0029] Therefore, as shown by reference numeral 1053 in the lower diagram of Fig. 10, the extension device 10 is changed from the narrow width state to a state adjusted in the longitudinal direction X by using the installation auxiliary tool 20 to shift the relative positional relationship between the first joint 11 and the second joint 12 along the longitudinal direction X. At this time, the end 14 of the extension device 10 in the longitudinal direction X is aligned on a straight line in a plan view.

[0030] Similarly, when the actual joint gap at the construction site is wider than the standard design position, as shown by reference numeral 1061 in the upper diagram of Figure 11, for example, at the time of delivery to the construction site, the expansion device 10 is in a standard state in which the relative positional relationship between the first joint 11 and the second joint 12 is set to a standard width that matches the standard design position of the joint gap by the installation auxiliary tool 20. At this time, the end portions 14 of the expansion device 10 in the longitudinal direction X are aligned on a straight line in a plan view.

[0031] If the actual joint gap at the construction site is wider than the standard design position, the expansion device 10 is expanded from the standard state in the perpendicular direction Y by separating the first joint 11 and the second joint 12 using the installation aid 20, as shown by reference numeral 1062 in the middle diagram of Figure 11. At this time, the end 14 of the expansion device 10 in the longitudinal direction X is no longer aligned in a straight line in plan view.

[0032] Therefore, as shown by reference numeral 1063 in the lower diagram of Fig. 11, the extension device 10 is changed from the widened state to a state adjusted in the longitudinal direction X by shifting the relative positional relationship between the first joint 11 and the second joint 12 along the longitudinal direction X using the installation auxiliary tool 20. At this time, the end portions 14 of the extension device 10 in the longitudinal direction X are aligned on a straight line in a plan view.

[0033] In this way, even if the object to which the expansion device 10 is to be installed is a skew bridge in which the gap shifts not only one-dimensionally in the perpendicular direction Y from the standard design position but also two-dimensionally in the perpendicular direction Y and the longitudinal direction X, by using the installation aid 20, it is possible to fine-tune the relative positional relationship between the first joint 11 and the second joint 12 to match the gap at the construction site, and also to align the end 14 of the expansion device 10 in the longitudinal direction X along the expansion and contraction direction of the bridge girder G.

[0034] 8, the first body 21 has a leg portion 211, and a bolt 232 and an elongated hole 234 that constitute the adjustment coupling portion 23. The leg portion 211 extends downward from an end of the first body 21 in the vertical direction Z. The leg portion 211 is attached to the first joint 11 by, for example, welding or the like. The bolt 232 protrudes from the first body 21 toward the second body 22 in the longitudinal direction X. The bolt 232 is passed through an elongated hole 233 of the second body 22. A nut (not shown) is screwed onto the bolt 232. The elongated hole 234 extends in the perpendicular direction Y. A bolt 235 of the second body 22 is passed through the elongated hole 234. The bolt 232 may be attached to the first body 21 by, for example, welding the head of the bolt 232 to the first body 21.

[0035] As shown in FIG. 9 , the second body 22 has a leg portion 221, and a bolt 235 and an elongated hole 233 that constitute the adjustment connecting portion 23. The leg portion 221 extends downward from an end of the second body 22 in the vertical direction Z. The bolt 235 protrudes from the second body 22 toward the first body 21 in the longitudinal direction X. The bolt 235 is passed through the elongated hole 234 of the first body 21. A nut (not shown) is screwed onto the bolt 235. The elongated hole 233 extends in the perpendicular direction Y. The bolt 232 of the first body 21 is passed through the elongated hole 233. The bolt 235 is attached to the second body 22 by, for example, welding the head of the bolt 235 to the second body 22.

[0036] The second main body 22 has a height restriction portion 222. The height restriction portion 222 protrudes in the longitudinal direction X toward the first main body 21 along the perpendicular direction Y. The lower surface of the height restriction portion 222 is flat along the horizontal direction to guide the upper end of the first main body 21. As a result, the height restriction portion 222 restricts the height position of the first main body 21 in the vertical direction Z.

[0037] The second main body 22 has an elongated hole 237 that forms part of the adjustment connecting part 23. The elongated hole 237 extends along the longitudinal direction X. The elongated hole 237 is provided in the leg part 221. A bolt 238 (see FIG. 6) that forms the adjustment connecting part 23 passes through the elongated hole 237. The bolt 238 is threaded into a female thread 239 (see FIG. 7) that is provided in the mounting part 231. The mounting part 231 is, for example, a rectangular flat plate of uniform thickness. The mounting part 231 is fixed to the second joint 12, for example, by welding or the like.

[0038] The adjustable connecting portion 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting portion 23 has a first guide mechanism 23A (see FIG. 6) that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. This allows the relative position of the first joint 11 and the second joint 12 to be adjusted along the perpendicular direction Y. The adjustable connecting portion 23 also has a second guide mechanism 23B (see FIG. 6) that allows the second body 22 and the second joint 12 to move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted. This allows the relative position of the first joint 11 and the second joint 12 to be adjusted along the longitudinal direction X.

[0039] Specifically, the first guide mechanism 23A of the adjustment connecting part 23 includes a bolt 232 and an elongated hole 234 provided in the first body 21, and a bolt 235 and an elongated hole 233 provided in the second body 22. As described above, the first guide mechanism 23A of the adjustment connecting part 23 includes the bolt 232 and the elongated hole 234 provided in the first body 21, and the bolt 235 and the elongated hole 233 provided in the second body 22. Therefore, when the first body 21 and the second body 22 are overlapped in the longitudinal direction X, the first body 21 and the second body 22 can slide freely along the perpendicular direction Y while maintaining their height in the vertical direction Z. Then, by tightening or loosening the nut passed through the bolt 232 or the bolt 235 at any position, the relative position of the first body 21 and the second body 22 can be positioned at any position, and the relative positional relationship between the first joint 11 and the second joint 12 in the perpendicular direction Y can be adjusted.

[0040] Additionally, the second guide mechanism 23B of the adjustable connecting part 23 has an elongated hole 237 that is provided in the second main body 22 and extends in the longitudinal direction X, and a bolt 238 that is passed through the elongated hole 237 and attached to the second joint 12. This allows the relative position between the second main body 22 and the second joint 12 to be positioned at any position, and the relative positional relationship between the first joint 11 and the second joint 12 in the longitudinal direction X to be adjusted.

[0041] In detail, the second guide mechanism 23B of the adjustment connecting part 23 includes an elongated hole 237 provided in the second main body 22, a bolt 238 passed through the elongated hole 237, and an attachment part 231 into which the bolt 238 is screwed. The attachment part 231 is attached to the second joint 12 by welding or the like. In this way, the second guide mechanism 23B of the adjustment connecting part 23 includes the elongated hole 237, the bolt 238, and the attachment part 231 provided in the second main body 22, and therefore the second main body 22 can slide freely with respect to the second joint 12 along the longitudinal direction X. Then, by tightening or loosening the bolt 238 screwed into the attachment part 231 at any position, the relative positions of the second joint 12 and the second main body 22 can be determined, and the relative positional relationship between the second joint 12 and the first joint 11 in the longitudinal direction X can be adjusted.

[0042] (Expansion Joint Installation Method) A method for installing the extension device 10 using the installation auxiliary tool 20 will be described below. The installation method for the extension device 10 includes the steps of fixing the first body 21 to the first joint 11, fixing the second body 22 to the second joint 12, connecting the first body 21 and the second body 22 with the adjustable connecting part 23, moving the first joint 11 and the second joint 12 relatively in the perpendicular direction Y while maintaining their height, and moving the first joint 11 and the second joint 12 relatively in the longitudinal direction X while maintaining their height. Note that the steps of moving relatively in the perpendicular direction Y and moving relatively in the longitudinal direction X may be performed simultaneously. This allows the relative positional relationship between the first joint 11 and the second joint 12 to be adjusted not only in the perpendicular direction Y but also in the longitudinal direction X while maintaining their height in the vertical direction Z. In other words, regardless of the installation direction of the expansion device 10, the relative positional relationship of the joints can be adjusted even if the fixing direction of the mounting auxiliary device 20 does not coincide with the expansion direction of the bridge girder G. Therefore, even if the target for installing the expansion device 10 is a skew bridge in which the gap shifts not only one-dimensionally in the perpendicular direction Y but also two-dimensionally in the perpendicular direction Y and the longitudinal direction X from the standard design position, for example, when the temperature at the construction site differs from the planned gap (standard design position), by using the mounting auxiliary device 20, the relative positional relationship between the first joint 11 and the second joint 12 can be fine-tuned to match the gap at the construction site, and the end 14 of the expansion device 10 in the longitudinal direction X can be aligned along the expansion direction of the bridge girder G. Therefore, even if the gap fluctuates when the bridge is in service, the movement of the expansion device 10 installed in the gap will not be hindered. Furthermore, since the fixing direction of the mounting aid 20 to the expansion device 10 does not need to be aligned with the expansion direction of the bridge girder G, it can always be in the same direction regardless of the installation direction of the expansion device 10, making it easy to fix the mounting aid 20 to the expansion device 10.

[0043] Below, we will explain the steps for assembling the mounting aid 20 of the first embodiment, attaching the mounting aid 20 to the expansion device 10, and adjusting the expansion device 10 to match the gap when applying the expansion device 10 to a skew bridge, with reference to Figures 6 to 9.

[0044] (1) As shown in Fig. 7, the attachment part 231 is fixed to the second joint 12 by welding or the like. The fixing location may be the side surface 122 of the second joint 12 or the upper surface 121 (a surface of the second joint 12 that is disposed above the side surface 122 and intersects with the vertical direction Z). Even if the telescopic device 10 is a horizontal toothed joint having a toothed joint structure, the location where the attachment part 231 is fixed to the second joint 12 by welding or the like may be the side surface 122 of the second joint 12 or the upper surface 121.

[0045] (2) As shown in Figure 6, the bolt 232 provided on the first body 21 is inserted into the elongated hole 233 provided on the second body 22. Alternatively, in addition to that, the bolt 235 provided on the second body 22 is inserted into the elongated hole 234 provided on the first body 21. Nuts are fitted onto the bolt 232 and the bolt 235, respectively, and tightened. This causes the first body 21 and the second body 22 to face each other and overlap in the longitudinal direction X with almost no gap between them. This enables the first guide mechanism 23A of the adjustment connecting part 23 to function.

[0046] (3) The leg portion 211 of the first body 21 is fixed to the first joint 11 by welding or the like.

[0047] (4) The leg 221 of the second main body 22 is attached to the mounting part 231. More specifically, with the bolt 238 passed through the elongated hole 237 provided in the leg 221 of the second main body 22, the bolt 238 is threaded into the female thread 239 provided in the mounting part 231 and tightened. This enables the second guide mechanism 23B of the adjustment connecting part 23 to function. In this way, the first joint 11 and the second joint 12 are connected via the mounting auxiliary tool 20. Then, for example, this state, i.e., the state in which the mounting auxiliary tool 20 is attached to the expansion device 10, is achieved in a factory away from the bridge construction site.

[0048] (5) When adjusting the expansion device 10 to fit the gap at the construction site, the nuts of the first guide mechanism 23A are loosened, the position of the second joint 12 relative to the first joint 11 in the perpendicular direction Y is adjusted, and then the nuts of the first guide mechanism 23A are tightened. Furthermore, the bolts 238 of the second guide mechanism 23B are loosened, and the position of the second joint 12 relative to the first joint 11 in the longitudinal direction X is adjusted based on the alignment of the end 14 of the expansion device 10 in the longitudinal direction X with the extension direction of the bridge girder G. The installation aid 20 is removed after the first joint 11 and the second joint 12 are installed at the ends of the bridge girder G. In this way, the expansion device 10 is adjusted to fit the gap by adjusting the relative positional relationship between the first joint 11 and the second joint 12 using the installation aid 20.

[0049] (Modification 1 of the first embodiment) Next, we will explain the installation auxiliary tool 20 according to the first modification of the first embodiment and the extension device 10 to which the installation auxiliary tool 20 is attached. Note that the explanation of parts common to the first embodiment described above may be omitted.

[0050] Reference numeral 1071 in the upper diagram of Fig. 12 is a plan view of the mounting aid 20 according to Modification 1 of the first embodiment. Reference numeral 1072 in the lower diagram is a right side view of the mounting aid 20 according to Modification 1 of the first embodiment. Reference numeral 1073 in the right diagram is a rear view of the mounting aid 20 according to Modification 1 of the first embodiment. Fig. 13 is a rear view of the mounting part 231a that constitutes the mounting aid 20 according to Modification 1 of the first embodiment.

[0051] As shown in Figures 12 and 13, the installation aid 20 relating to variant 1 of the first embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 facing from the first joint 11 to the second joint 12.

[0052] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a second guide mechanism 23B that allows the second joint 12 and the second body 22 to move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted.

[0053] Here, the mounting aid 20 according to Modification 1 of the first embodiment differs from the first embodiment in that, instead of fixing a mounting part 231 having a female thread 239 to the second joint 12, a mounting part 231a also having a female thread 239 is fixed. The mounting part 231a may be a hexagonal nut. This allows the components constituting the mounting aid 20 to be general-purpose components. Furthermore, the need for machining the mounting part 231 to provide the female thread 239 is eliminated, saving machining work, and using general-purpose components also reduces costs. Furthermore, the positional relationship between the first joint 11 and the second joint 12 in the longitudinal direction X can be adjusted by loosening or tightening the bolt 238 passed through the elongated hole 237 and threaded into the female thread 239.

[0054] (Modification 2 of the first embodiment) Next, an explanation will be given of an attachment auxiliary tool 20 according to Modification 2 of the first embodiment and an extension device 10 to which the attachment auxiliary tool 20 is attached. Note that explanations of parts common to the above-mentioned first embodiment may be omitted.

[0055] Reference numeral 1081 in the upper diagram of Fig. 14 is a plan view of the mounting aid 20 according to Modification 2 of the first embodiment. Reference numeral 1082 in the lower diagram is a right side view of the mounting aid 20 according to Modification 2 of the first embodiment. Reference numeral 1083 in the right diagram is a rear view of the mounting aid 20 according to Modification 2 of the first embodiment. Fig. 15 is a rear view of the male screw 231b that constitutes the mounting aid 20 according to Modification 2 of the first embodiment.

[0056] As shown in Figures 14 and 15, the installation aid 20 relating to variant example 2 of the first embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 facing from the first joint 11 to the second joint 12.

[0057] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a second guide mechanism 23B that allows the second joint 12 and the second body 22 to move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted.

[0058] Here, the mounting aid 20 according to Modification 2 of the first embodiment differs from the first embodiment in that, instead of fixing the mounting part 231 or the mounting part 231a to the second joint 12, a male screw 231b is fixed. Furthermore, a nut 238b is attached to the male screw 231b while the male screw 231b is threaded through the elongated hole 237. The male screw 231b may be a hexagon bolt or a stud bolt. This allows the components constituting the mounting aid 20 to be general-purpose components. Furthermore, the positional relationship between the first joint 11 and the second joint 12 in the longitudinal direction X can be adjusted by loosening or tightening the nut 238b threaded through the elongated hole 237 and threaded onto the male screw 231b. Furthermore, because the male screw 231b is fixed to the second joint 12, the male screw 231b, which serves as a guide during adjustment, is stable even when the nut is loosened, facilitating relative movement.

[0059] (Modification 3 of the first embodiment) Next, an explanation will be given of an attachment auxiliary tool 20 according to Modification 3 of the first embodiment and an extension device 10 to which the attachment auxiliary tool 20 is attached. Note that explanations of parts common to the above-mentioned first embodiment may be omitted.

[0060] Reference numeral 1091 in the upper diagram of Fig. 16 is a plan view of the mounting aid 20 according to Modification 3 of the first embodiment. Reference numeral 1092 in the lower diagram is a right side view of the mounting aid 20 according to Modification 3 of the first embodiment. Reference numeral 1093 in the right diagram is a rear view of the mounting aid 20 according to Modification 3 of the first embodiment. Fig. 17 is a rear view of the mounting part 231 constituting the mounting aid 20 according to Modification 3 of the first embodiment.

[0061] As shown in Figures 16 and 17, the installation aid 20 relating to variant example 3 of the first embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 facing from the first joint 11 to the second joint 12.

[0062] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a second guide mechanism 23B that allows the second joint 12 and the second body 22 to move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted.

[0063] The second guide mechanism 23B of the adjustable connecting part 23 has an elongated hole 237 that is provided in the second main body 22 and extends in the longitudinal direction X, and a bolt 238 that is passed through the elongated hole 237 and attached to the second joint 12. This makes it possible to position the relative position between the second main body 22 and the second joint 12 at any position based on the elongated hole 237 and the bolt 238, and to adjust the relative positional relationship between the first joint 11 and the second joint 12 in the longitudinal direction X.

[0064] The fixing position of the bolt 238 of the second body 22 can be made stronger if it is fixed near the plate member 223 of the leg 221 extending downward from the end of the second body 22 along the vertical direction Z, and further, if the fixing position is close to the plate member 223 of the leg 221 to which force is transmitted, the stress generated in the bolt 238 can be reduced when transporting the expansion device 10 or adjusting the relative positional relationship between the first joint 11 and the second joint 12.

[0065] In the first embodiment, the bolt 238 is fixed at the center of the elongated hole 237 so that the misalignment can be adjusted on either side in the longitudinal direction X. Therefore, the fixing position of the bolt 238 is spaced apart from the plate member 223 of the leg 221.

[0066] In the case of the third variant of the first embodiment, for example, when shipping from the factory to the construction site, the bolts 238 are attached to the female threads 239 on both sides in the longitudinal direction X, so that the fixing position of the bolts 238 can be fixed near the plate members 223 of the leg portions 221.

[0067] Here, the mounting aid 20 according to the third modification of the first embodiment differs from the first embodiment in that a plurality of female screws 239 provided on the mounting part 231 are arranged along the longitudinal direction X. For example, as shown in FIG. 17 , the female screws 239 are arranged in two rows of three locations along the longitudinal direction X, for a total of six locations. As shown in FIG. 16 , for example, when the mounting aid 20 is shipped from a factory to a construction site, bolts 238 are attached to the female screws 239 on both sides in the longitudinal direction X. No bolt 238 is attached to the female screw 239 in the center in the longitudinal direction X. In other words, the number of female screws 239 and the number of bolts 238 do not need to be the same. This allows the bolts 238 to fix the second main body 22 at a position closer to the plate member 223 of the leg 221, thereby reducing the stress acting on the bolts 238 and stabilizing the posture of the mounting aid 20 relative to the extension device 10 for a strong connection. At the construction site, any of the bolts 238 in the longitudinal direction X can be removed, or removed and attached to another female thread 239, or the remaining attached bolts 238 can be loosened or tightened without removing them. Note that in other embodiments as well, similarly, for example, by fixing the second main body 22 with the bolts 238 at a position close to the plate member 223 of the leg 221, it is possible to achieve the same effects as above, such as the effect of reducing the stress acting on the bolts 238 and the effect of stabilizing the posture of the attachment auxiliary tool 20 relative to the extension device 10 and firmly connecting them.

[0068] The positional relationship between the first joint 11 and the second joint 12 in the longitudinal direction X can be adjusted by changing the location where the bolt 238 is attached from among the multiple female threads 239 arranged along the longitudinal direction X, moving the second body 22 and the second joint 12 relative to each other in the longitudinal direction X, and loosening or tightening the bolt 238 that is threaded into the female thread 239 and passed through the long hole 237.

[0069] (Fourth modification of the first embodiment) Next, an explanation will be given of an attachment auxiliary tool 20 according to the fourth modification of the first embodiment and an extension device 10 to which the attachment auxiliary tool 20 is attached. Note that explanations of parts common to the first embodiment described above may be omitted.

[0070] Reference numeral 1101 in the upper diagram of Fig. 18 is a plan view of the mounting aid 20 according to Modification 4 of the first embodiment. Reference numeral 1102 in the lower diagram is a right side view of the mounting aid 20 according to Modification 4 of the first embodiment. Reference numeral 1103 in the right diagram is a rear view of the mounting aid 20 according to Modification 4 of the first embodiment. Fig. 19 is a rear view of the mounting part 231 that constitutes the mounting aid 20 according to Modification 4 of the first embodiment.

[0071] As shown in Figures 18 and 19, the installation aid 20 relating to the fourth variant of the first embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 facing from the first joint 11 to the second joint 12.

[0072] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a second guide mechanism 23B that allows the second joint 12 and the second body 22 to move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted.

[0073] Here, in the mounting aid 20 according to the fourth modification of the first embodiment, a plurality of female screws 239 are arranged in the mounting part 231 along the longitudinal direction X. For example, as shown in FIG. 19 , the female screws 239 are arranged in two rows along the longitudinal direction X, two at upper and two at lower positions, for a total of four positions. As shown in FIG. 18 , the leg 221 of the second main body 22 has connecting members 224 extending along the longitudinal direction X on both sides of the plate member 223, sandwiching the plate member 223 extending downward in the vertical direction Z along the perpendicular direction Y from the end of the second main body 22 in the perpendicular direction Y. The elongated holes 237 are provided at positions corresponding to the positions of the female screws 239 of the mounting part 231. This allows the second main body 22 to be fixed on both sides in the longitudinal direction X across the plate member 223, rather than from one side. This allows the mounting aid 20 to be firmly connected to the extension device 10 with its posture stabilized. The positional relationship between the first joint 11 and the second joint 12 in the longitudinal direction X can be adjusted by moving the second body 22 and the second joint 12 relative to each other in the longitudinal direction X and loosening or tightening the bolt 238 that is threaded into the female thread 239 and passed through the long hole 237.

[0074] (Fifth Modification of the First Embodiment) Next, an explanation will be given of an attachment auxiliary tool 20 according to the fifth modified example of the first embodiment and an extension device 10 to which the attachment auxiliary tool 20 is attached. Note that explanations of parts common to the first embodiment described above may be omitted.

[0075] Reference numeral 1111 in the upper diagram of Fig. 20 is a plan view of the mounting aid 20 according to Modification 5 of the first embodiment. Reference numeral 1112 in the lower diagram is a right side view of the mounting aid 20 according to Modification 5 of the first embodiment. Reference numeral 1113 in the left diagram is a front view of the mounting aid 20 according to Modification 5 of the first embodiment. Reference numeral 1114 in the right diagram is a rear view of the mounting aid 20 according to Modification 5 of the first embodiment. Fig. 21 is a rear view of the first mounting part 231c that constitutes the mounting aid 20 according to Modification 5 of the first embodiment. Fig. 22 is a front view of the second mounting part 231d that constitutes the mounting aid 20 according to Modification 5 of the first embodiment.

[0076] As shown in Figures 20 to 22, the installation aid 20 relating to the fifth variant of the first embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 facing from the first joint 11 to the second joint 12.

[0077] The adjustable connecting portion 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting portion 23 has a first guide mechanism 23A that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting portion 23 also has a second guide mechanism 23B that connects the second joint 12 and the second body 22 so that they can move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted. Here, the adjustable connecting portion 23 further has a third guide mechanism 23C that connects the first joint 11 and the first body 21 so that they can move relative to each other in the longitudinal direction X and connects them so that their fixed positions can be adjusted.

[0078] In detail, the mounting aid 20 according to the fifth modification of the first embodiment includes a first mounting part 231c and a second mounting part 231d. As shown in Fig. 21, the first mounting part 231c is fixed to the second joint 12 by welding or the like. As shown in Fig. 22, the second mounting part 231d is fixed to the first joint 11 by welding or the like.

[0079] As shown in FIG. 20 , the first body 21 has a leg 211, and a bolt 232 and an elongated hole 234 that constitute the first guide mechanism 23A of the adjustment connecting part 23. The leg 211 extends downward from an end of the first body 21 along the vertical direction Z. The leg 211 has a bolt 238 and an elongated hole 237 that constitute the third guide mechanism 23C. In the first guide mechanism 23A, the bolt 232 protrudes from the first body 21 toward the second body 22 along the longitudinal direction X. The bolt 232 is passed through the elongated hole 233 of the second body 22. A nut is screwed onto the bolt 232. The elongated hole 234 extends along the perpendicular direction Y. A bolt 235 of the second body 22 is passed through the elongated hole 234. In the third guide mechanism 23C, the leg portion 211 is attached to a second mounting part 231d fixed to the first joint 11 by a bolt 238 passed through an elongated hole 237.

[0080] As shown in FIG. 20 , the second main body 22 has a leg portion 221, and a bolt 235 and an elongated hole 233 that constitute the first guide mechanism 23A of the adjustment connecting part 23. The leg portion 221 extends downward from an end of the second main body 22 in the vertical direction Z. The leg portion 221 has a bolt 238 and an elongated hole 237 that constitute the second guide mechanism 23B. In the first guide mechanism 23A, the bolt 235 protrudes from the second main body 22 toward the first main body 21 in the longitudinal direction X. The bolt 235 is passed through the elongated hole 234 of the first main body 21. A nut is screwed onto the bolt 235. The elongated hole 233 extends in the perpendicular direction Y. The bolt 232 of the first main body 21 is passed through the elongated hole 233. In the second guide mechanism 23B, the leg portion 221 is attached to a first mounting part 231c fixed to the second joint 12 by a bolt 238 passed through an elongated hole 237.

[0081] As described above, the mounting aid 20 according to the fifth modification of the first embodiment has the second guide mechanism 23B and the third guide mechanism 23C that can adjust the relative position of the first joint 11 and the second joint 12 along the longitudinal direction X. As a result, when only the second guide mechanism 23B is provided, the bolt 238 is fixed at the center of the elongated hole 237 so that the misalignment can be adjusted to either one side or the other side in the longitudinal direction X. However, in the fifth modification of the first embodiment, since the third guide mechanism 23C is also provided, the bolt 238 can be fixed at the end of the elongated hole 237, and can be fixed at a position closer to the plate member 223. This reduces the stress acting on the bolt 238, and also stabilizes the posture of the mounting aid 20 relative to the extension device 10, allowing for a strong connection. Since the second guide mechanism 23B or the third guide mechanism 23C can be selected depending on whether the deviation in the longitudinal direction X is to be adjusted to one side or the other side in the longitudinal direction X, the length of the elongated hole 237 in the longitudinal direction X can be reduced (the elongated hole 237 can be reduced to about half the length compared to a configuration with only the second guide mechanism 23B). Therefore, the sizes of the first mounting part 231c and the second mounting part 231d in the longitudinal direction X can also be reduced accordingly. Furthermore, because the mounting auxiliary tool 20 and the first joint 11 and the second joint 12 are attached with bolts 238 rather than welded, the mounting auxiliary tool 20 (excluding the first mounting part 231c and the second mounting part 231d) can be removed and easily reused.

[0082] (Second embodiment) Next, a description will be given of an attachment auxiliary tool 20 according to a second embodiment and an extension device 10 to which the attachment auxiliary tool 20 is attached. Note that descriptions of parts common to the first embodiment described above may be omitted.

[0083] Reference numeral 1121 in the upper diagram of Fig. 23 is a plan view of the mounting aid 20 according to the second embodiment. Reference numeral 1122 in the lower diagram is a right side view of the mounting aid 20 according to the second embodiment. Reference numeral 1123 in the left diagram is a front view of the mounting aid 20 according to the second embodiment. Reference numeral 1124 in the right diagram is a back view of the mounting aid 20 according to the second embodiment.

[0084] As shown in FIG. 23, the mounting aid 20 according to the second embodiment comprises a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 so as to maintain the height by restricting movement in the vertical direction Z and to be movable relative to each other in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 that faces from the first joint 11 to the second joint 12.

[0085] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts the relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a fourth guide mechanism 23D that allows the first joint 11 and the second joint 12 to move relative to each other in the longitudinal direction X.

[0086] Specifically, the fourth guide mechanism 23D of the adjustment connecting part 23 has a hinge H that connects the first body 21 and the second body 22 so as to be rotatable about a vertical axis (vertical direction Z). The hinge H is, for example, a hinge. The adjustment connecting part 23 of the mounting aid 20 according to the second embodiment has a first hinge H1 and a second hinge H2. Specifically, the leg 211 of the first body 21 is fixed to the first joint 11 by welding or the like. The first guide mechanism 23A portion of the first body 21 and the leg 211 are fixed by a detachable bolt 238. The first guide mechanism 23A portion of the first body 21 and the leg 211 are connected by the first hinge H1. The leg 221 of the second body 22 is fixed to the second joint 12 by welding or the like. The first guide mechanism 23A portion of the second main body 22 and the leg 221 are fixed by a detachable bolt 238. The first guide mechanism 23A portion of the second main body 22 and the leg 221 are connected by a second hinge H2. This allows the first joint 11 and the second joint 12 to move relatively in the perpendicular direction Y with the bolt 238 attached. Furthermore, when the bolt 238 is removed, as shown in FIG. 23 , the leg 211 and the first guide mechanism 23A portion rotate relatively at the first hinge H1, and the leg 221 and the first guide mechanism 23A portion rotate relatively at the second hinge H2, allowing the first joint 11 and the second joint 12 to move relatively in the longitudinal direction X. Furthermore, in a state where the first joint 11 and the second joint 12 are connected using a plurality of attachment aids 20, the first joint 11 and the second joint 12 can be moved in parallel relative to each other.

[0087] (Third embodiment) Next, we will explain the installation auxiliary tool 20 according to the third embodiment and the extension device 10 to which the installation auxiliary tool 20 is attached. Note that the explanation of parts common to the first embodiment or the second embodiment described above may be omitted.

[0088] Reference numeral 1131 in the upper diagram of Fig. 24 is a plan view of the mounting aid 20 according to the third embodiment. Reference numeral 1132 in the lower diagram is a right side view of the mounting aid 20 according to the third embodiment. Reference numeral 1133 in the left diagram is a front view of the mounting aid 20 according to the third embodiment. Reference numeral 1134 in the right diagram is a back view of the mounting aid 20 according to the third embodiment.

[0089] As shown in FIG. 24, the mounting aid 20 according to the third embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 so as to maintain the height by restricting movement in the vertical direction Z and to be movable relative to each other in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 that faces from the first joint 11 to the second joint 12.

[0090] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts the relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a fifth guide mechanism 23E that allows the first joint 11 and the second joint 12 to move relative to each other in the longitudinal direction X.

[0091] In detail, the first guide mechanism 23A has a third body 24 that connects the first body 21 and the second body 22 via bolts and nuts. The third body 24 has elongated holes extending along the perpendicular direction Y at two locations spaced apart in the perpendicular direction Y. A bolt attached to the first body 21 is passed through one of the elongated holes in the third body 24 and fastened with a nut. A bolt attached to the second body 22 is passed through the other elongated hole in the third body 24 and fastened with a nut. The third body 24 may be a so-called angle bar that has an L-shaped cross section and extends in the perpendicular direction Y. Although there are two elongated holes, either one may be a circular hole.

[0092] The fifth guide mechanism 23E has a fourth main body 25, a fifth main body 26, a third hinge H3 that connects the first main body 21 and the fourth main body 25 to be rotatable about a vertical axis (vertical direction Z), a fourth hinge H4 that connects the second main body 22 and the fifth main body 26 to be rotatable about the vertical axis (vertical direction Z), and a fifth hinge H5 that connects the fourth main body 25 and the fifth main body 26 to be rotatable about the vertical axis (vertical direction Z). The sum of the horizontal lengths of the fourth main body 25 and the fifth main body 26, i.e., the sum of the distance between the third hinge H3 and the fifth hinge H5 and the distance between the fourth hinge H4 and the fifth hinge H5, is longer than the distance between the third hinge H3 and the fourth hinge H4. Thus, the adjustment connection portion 23 of the mounting aid 20 of the third embodiment has a third hinge H3, a fourth hinge H4, and a fifth hinge H5 that rotatably connect the first main body 21 and the second main body 22 around a vertical axis.

[0093] The adjustable connecting portion 23 has three or more hinges. With the third body 24 attached to the first body 21 and the second body 22, the relative position of the first joint 11 and the second joint 12 can be adjusted along the perpendicular direction Y. With the third body 24 detached, the third hinge H3, the fourth hinge H4, and the fifth hinge H5 each rotate freely, allowing the relative position of the first joint 11 and the second joint 12 to be adjusted two-dimensionally (in the horizontal plane) in both the perpendicular direction Y and the longitudinal direction X. This allows a wider range for adjusting the relative positional relationship between the first joint 11 and the second joint 12. With the first joint 11 and the second joint 12 connected using multiple mounting aids 20, the first joint 11 and the second joint 12 can be moved parallel to each other.

[0094] (Modification 1 of the third embodiment) Next, we will explain the installation auxiliary tool 20 according to the first modified example of the third embodiment and the extension device 10 to which the installation auxiliary tool 20 is attached. Note that the explanation of parts common to the above-mentioned third embodiment may be omitted.

[0095] Reference numeral 1141 in the upper diagram of FIG. 25 is a plan view of the mounting aid 20 according to Modification 1 of the third embodiment. Reference numeral 1142 in the lower diagram is a right side view of the mounting aid 20 according to Modification 1 of the third embodiment. Reference numeral 1143 in the left diagram is a front view of the mounting aid 20 according to Modification 1 of the third embodiment. Reference numeral 1144 in the right diagram is a back view of the mounting aid 20 according to Modification 1 of the third embodiment. Reference numeral 1151 in the upper diagram of FIG. 26 is a plan view of the mounting aid 20 according to Modification 1 of the third embodiment when adjusted. Reference numeral 1152 in the lower diagram is a right side view of the mounting aid 20 according to Modification 1 of the third embodiment when adjusted. Reference numeral 1153 in the left diagram is a front view of the mounting aid 20 according to Modification 1 of the third embodiment when adjusted. Reference numeral 1154 in the right diagram is a back view of the mounting aid 20 according to Modification 1 of the third embodiment when adjusted.

[0096] As shown in Figures 25 and 26, the installation aid 20 relating to variant example 1 of the third embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 facing from the first joint 11 to the second joint 12.

[0097] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a sixth guide mechanism 23F that restricts relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a fifth guide mechanism 23E that allows the first joint 11 and the second joint 12 to move relative to each other in the longitudinal direction X.

[0098] Specifically, the sixth guide mechanism 23F has a sixth body 27 that connects the first body 21 and the second body 22 via bolts and nuts. The sixth body 27 has a flat horizontal portion 271 extending along the perpendicular direction Y and a flat vertical portion 272 extending from the horizontal portion 271 along the vertical direction Z. The sixth body 27 has two elongated holes in the horizontal portion 271 that extend along the perpendicular direction Y and are spaced apart in the perpendicular direction Y. A bolt attached to the first body 21 is inserted into one of the elongated holes of the sixth body 27 and fastened with a nut. A bolt attached to the second body 22 is inserted into the other elongated hole of the sixth body 27 and fastened with a nut. The sixth body 27 may be a so-called angle bar that has an L-shaped cross section and extends in the perpendicular direction Y. Although there are two elongated holes, either one may be a circular hole.

[0099] 25 , when the sixth main body 27 is attached to the first main body 21 and the second main body 22 with the vertical portion 272 extending downward from the horizontal portion 271, the vertical portion 272 restricts relative movement between the first main body 21 and the second main body 22 in the longitudinal direction X, making it possible to adjust the relative position between the first joint 11 and the second joint 12 along the perpendicular direction Y. Furthermore, when the sixth main body 27 is detached, the third hinge H3, the fourth hinge H4, and the fifth hinge H5 each rotate freely, making it possible to adjust the relative position between the first joint 11 and the second joint 12 two-dimensionally (within the horizontal plane) in both the longitudinal direction X and the perpendicular direction Y.

[0100] 26, when the sixth main body 27 is attached to the first main body 21 and the second main body 22 with the vertical portion 272 extending upward from the horizontal portion 271, the restriction on relative movement between the first main body 21 and the second main body 22 in the longitudinal direction X by the vertical portion 272 is released, so that the relative position of the first joint 11 and the second joint 12 can be adjusted not only in the perpendicular direction Y but also in the longitudinal direction X. The joints can be fixed at the adjusted position by tightening bolts and nuts.

[0101] (Adjusting the relative position between the first and second joints) A method for adjusting the relative positional relationship between the first joint 11 and the second joint 12 to match the joint gap at the construction site using the mounting aid 20 according to the third embodiment will be described with reference to FIG.

[0102] Figure 27 is a diagram illustrating the adjustment of the extension device 10 in a wide gap using the installation aid 20 according to the third embodiment. Reference numeral 1161 in the upper figure is a plan view of the extension device 10 in a standard state set at the standard width. Reference numeral 1162 in the middle figure is a plan view of the extension device 10 in an expanded state in which it has been expanded in the perpendicular direction from the standard state. Reference numeral 1163 in the lower figure is a plan view of the extension device 10 in a state in which it has been adjusted in the longitudinal direction from the expanded state.

[0103] As shown by reference numeral 1161 in the upper diagram of Figure 27, for example, at the time of delivery to the construction site, the expansion device 10 is in a standard state in which the relative positional relationship between the first joint 11 and the second joint 12 is set to a standard width that matches the standard design position of the gap by the installation auxiliary tool 20. At this time, the end portions 14 of the expansion device 10 in the longitudinal direction X are aligned on a straight line in a plan view.

[0104] Here, if the actual joint gap at the construction site is wider than the standard design position, as shown by reference numeral 1162 in the middle diagram of Fig. 27, the installation auxiliary tool 20 is used to separate the first joint 11 and the second joint 12 of the expansion device 10 along the perpendicular direction Y, thereby bringing the expansion device 10 into an expanded state in which it is expanded from the standard state in the perpendicular direction Y. At this time, the end portions 14 of the expansion device 10 in the longitudinal direction X are no longer aligned on a straight line in plan view.

[0105] Therefore, as shown by reference numeral 1163 in the lower diagram of Fig. 27, the extension device 10 is changed from the widened state to a state adjusted in the longitudinal direction X by using the installation auxiliary tool 20 to shift the relative positional relationship between the first joint 11 and the second joint 12 along the longitudinal direction X. At this time, the end portions 14 of the extension device 10 in the longitudinal direction X are aligned on a straight line in a plan view.

[0106] Furthermore, with the mounting aid 20 according to the third embodiment, the process of moving the first joint 11 and the second joint 12 closer or farther apart along the perpendicular direction Y and the process of shifting the relative positional relationship between the first joint 11 and the second joint 12 along the longitudinal direction X can be performed simultaneously without being separated.

[0107] In this way, even if the target for installing the expansion device 10 is a skew bridge in which the gap shifts not only one-dimensionally in the perpendicular direction Y from the standard design position but also two-dimensionally in the perpendicular direction Y and the longitudinal direction X, by using the installation aid 20, it is possible to fine-tune the relative positional relationship between the first joint 11 and the second joint 12 to match the gap at the construction site, and to align the end 14 of the expansion device 10 in the longitudinal direction X along the extension and contraction direction of the bridge girder G. In particular, with the installation aid 20 according to the third embodiment, the process of moving the first joint 11 and the second joint 12 closer or farther apart in the perpendicular direction Y and the process of shifting the relative positional relationship between the first joint 11 and the second joint 12 along the longitudinal direction X can be performed simultaneously without being separated.

[0108] (Modification 2 of the third embodiment) Next, an explanation will be given of an attachment auxiliary tool 20 according to Modification 2 of the third embodiment and an extension device 10 to which the attachment auxiliary tool 20 is attached. Note that explanations of parts common to the above-mentioned third embodiment may be omitted.

[0109] Reference numeral 1171 in the upper diagram of Fig. 28 is a plan view of the mounting aid 20 according to Modification 2 of the third embodiment. Reference numeral 1172 in the lower diagram is a right side view of the mounting aid 20 according to Modification 2 of the third embodiment. Reference numeral 1173 in the left diagram is a front view of the mounting aid 20 according to Modification 2 of the third embodiment. Reference numeral 1174 in the right diagram is a back view of the mounting aid 20 according to Modification 2 of the third embodiment.

[0110] As shown in FIG. 28, the mounting aid 20 according to the second modification of the third embodiment includes a first body 21 fixed to the first joint 11, a second body 22 fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain the height by restricting movement in the vertical direction Z and that connects the first joint 11 and the second joint 12 so as to be movable relative to each other in the longitudinal direction X of the extension device 10 and in the direction Y perpendicular to the longitudinal direction X of the extension device 10 that faces from the first joint 11 to the second joint 12.

[0111] The adjustable connecting part 23 connects the first joint 11 and the second joint 12 so that they can move relative to each other. The adjustable connecting part 23 has a first guide mechanism 23A that restricts the relative movement between the first body 21 and the second body 22 in one direction (the perpendicular direction Y) and connects them so that their fixed positions can be adjusted. The adjustable connecting part 23 also has a seventh guide mechanism 23G that allows the first joint 11 and the second joint 12 to move relative to each other in the longitudinal direction X.

[0112] In detail, the seventh guide mechanism 23G has a seventh main body 281, an eighth main body 282, a ninth main body 283, a tenth main body 284, a sixth hinge H6 that rotatably connects the first main body 21 and the seventh main body 281 around a vertical axis (vertical direction Z), a seventh hinge H7 that rotatably connects the second main body 22 and the tenth main body 284 around a vertical axis (vertical direction Z), an eighth hinge H8 that rotatably connects the seventh main body 281 and the eighth main body 282 around a vertical axis (vertical direction Z), a ninth hinge H9 that rotatably connects the eighth main body 282 and the ninth main body 283 around a vertical axis (vertical direction Z), and a tenth hinge H10 that rotatably connects the ninth main body 283 and the tenth main body 284 around a vertical axis (vertical direction Z). The total horizontal length of each of the seventh to tenth main bodies 281 to 284, i.e., the total distance between adjacent hinges from the sixth hinge H6 to the tenth hinge H10, is longer than the distance between the sixth hinge H6 and the seventh hinge H7. In this way, the adjustment connecting portion 23 of the mounting aid 20 according to the second modification of the third embodiment has five hinges from the sixth hinge H6 to the tenth hinge H10 that connect the first main body 21 and the second main body 22 rotatably about the vertical axis.

[0113] With the third body 24 attached to the first body 21 and the second body 22, the relative position of the first joint 11 and the second joint 12 can be adjusted along the perpendicular direction Y. Furthermore, with the third body 24 detached, the sixth hinge H6 to the tenth hinge H10 each rotate freely, so the relative position of the first joint 11 and the second joint 12 can be adjusted two-dimensionally (in the horizontal plane) in both directions in the longitudinal direction X. This increases the range over which the relative positional relationship between the first joint 11 and the second joint 12 can be adjusted. Furthermore, because the number of hinges exceeds three, the sixth guide mechanism 23F can be folded up small, allowing the space occupied by the mounting aid 20 to be made compact.

[0114] As described above, the installation auxiliary tool 20 according to the embodiment is used in an expansion device 10 that includes a first joint 11 and a second joint 12 that faces the first joint 11. The installation auxiliary tool 20 includes a first main body 21 that is fixed to the first joint 11, a second main body 22 that is fixed to the second joint 12, and an adjustable connecting part 23 that connects the first joint 11 and the second joint 12 to maintain their height by restricting movement in the vertical direction Z and allowing relative movement in the longitudinal direction X of the expansion device 10 and in the direction Y perpendicular to the longitudinal direction X that extends from the first joint 11 to the second joint 12. This makes it possible to adjust the relative positional relationship between the first joint 11 and the second joint 12 not only in the perpendicular direction Y but also in the longitudinal direction X while maintaining their height in the vertical direction Z. In other words, regardless of the installation direction of the expansion device 10, the relative positional relationship of the joints can be adjusted even if the fixing direction of the installation auxiliary tool 20 does not coincide with the extension direction of the bridge girder G. Therefore, for example, even if the target for installing the expansion device 10 is a skew bridge in which the gap (the relative positional relationship between the first joint 11 and the second joint 12) shifts from the standard design position not only one-dimensionally in the perpendicular direction Y but also two-dimensionally in the perpendicular direction Y and the longitudinal direction X, due to factors such as the temperature at the construction site, the use of the installation aid 20 makes it possible to fine-tune the relative positional relationship between the first joint 11 and the second joint 12 to match the gap at the construction site, and also to align the end 14 of the expansion device 10 in the longitudinal direction X along the extension and contraction direction of the bridge girder G. Therefore, even if the gap fluctuates when the bridge is in service, the movement of the expansion device 10 installed in the gap will not be hindered. Furthermore, since there is no need to align the fixing direction of the mounting aid 20 to the expansion device 10 with the extension direction of the bridge girder G (precisely align it with the extension direction of the expansion device), there is no need to install it at an angle to the longitudinal direction of the expansion device (installation direction of the expansion device) regardless of the installation direction of the expansion device 10, and it can always be installed in the same direction, which makes it easier to fix the mounting aid 20 to the expansion device 10. Furthermore, when the mounting aid 20 is installed at an angle to the longitudinal direction X of the expansion device 10, there is a possibility that it may interfere with the anchor 13, but this also disappears.

[0115] Furthermore, the expansion device 10 according to the embodiment is fitted with the above-mentioned installation auxiliary tool 20. This allows the relative positional relationship of the joints to be adjusted regardless of the installation direction of the expansion device 10, even if the fixing direction of the installation auxiliary tool 20 and the expansion direction of the bridge girder G do not coincide.

[0116] Furthermore, the installation method of the expansion device 10 according to the embodiment includes the steps of fixing the first body 21 to the first joint 11 using the installation auxiliary tool 20, fixing the second body 22 to the second joint 12, connecting the first body 21 and the second body 22 with the adjustable connecting part 23, moving the first joint 11 and the second joint 12 relatively in the perpendicular direction Y while maintaining their height, and moving the first joint 11 and the second joint 12 relatively in the longitudinal direction X while maintaining their height. This allows the relative positional relationship of the joints to be adjusted regardless of the installation direction of the expansion device 10, and even if the fixing direction of the installation auxiliary tool 20 does not match the extension direction of the bridge girder G.

[0117] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the first body 21 is fixed to the side surface 112 of the first joint 11, the second body 22 is fixed to the side surface 122 of the second joint 12, and the mounting aid 20 is provided to the first joint 11 and the second joint 12 so as to straddle the first joint 11 and the second joint 12. However, the present invention is not limited to this. In another embodiment, the first body 21 may be fixed by welding or the like to the upper surface 111 above the side surface 112 of the first joint 11, and the second body 22 may be fixed by welding or the like to the upper surface 121 above the side surface 122 of the second joint 12, so that the mounting aid 20 is provided to the first joint 11 and the second joint 12 without straddling the first joint 11 and the second joint 12.

[0118] In this case, as shown in Patent Document 3 (JP 2000-248505 A), in first and second joints having a toothed joint structure in which concave and convex portions face each other across a gap, even if there are protrusions that protrude outward on each side surface of the first and second joints, the protrusions do not interfere with installation and the installation aid 20 can be provided on the upper surfaces of the first and second joints. In another embodiment, the first body 21 or the second body 22 may be fixed to the side surface 112, 122 of one of the first joint 11 and the second joint 12, and the first body 21 or the second body 22 may be fixed to the upper surface 111, 121 of the other of the first joint 11 and the second joint 12.

[0119] In addition, the components in the above-described embodiments may be replaced with known components as appropriate without departing from the spirit of the present invention. Furthermore, the above-described modifications may be combined as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0120] 10 Telescopic device 11 First joint 12 Second joint 20 Installation aids 21 First Body 22 Second Body 23 Adjustment connection 231 Mounting parts 23A First guide mechanism 23B Second guide mechanism A Bridge axis direction B Perpendicular to the bridge axis X Longitudinal direction Y Perpendicular to the longitudinal direction of the expansion device Z vertical direction

Claims

1. An installation aid used in an expansion device having a first joint and a second joint opposite to the first joint, a first body fixed to the first joint; a second body fixed to the second joint; an adjustable connection part that connects the first joint and the second joint so as to maintain the height by restricting movement in the vertical direction and to be relatively movable in the longitudinal direction of the expansion device and in a direction perpendicular to the longitudinal direction from the first joint to the second joint; Mounting aids.

2. The adjustable connecting portion has a first guide mechanism that restricts relative movement between the first body and the second body in one direction and adjustably connects the first body and the second body to each other at a fixed position. The mounting aid according to claim 1 .

3. The adjustable connecting portion has a second guide mechanism that connects the second body and the second joint so that they can move relatively in the longitudinal direction and adjustably fix their positions relative to each other. The mounting aid according to claim 1 .

4. The adjustment connection portion has an elongated hole provided in the second body and extending in the longitudinal direction, and a bolt that is passed through the elongated hole and attached to the second joint. The mounting aid according to claim 3.

5. The adjustable connecting portion has a hinge that connects the first body and the second body rotatably about a vertical axis. The mounting aid according to claim 1 .

6. The adjustable linkage has three or more of the hinges. The mounting aid according to claim 5.

7. The mounting aid according to any one of claims 1 to 6 is attached. Telescopic device.

8. The longitudinal end is aligned with the bridge axis direction. The telescopic device according to claim 7.

9. a step of fixing the first body to the first joint using the mounting aid according to any one of claims 1 to 6; fixing the second body to the second joint; connecting the first body and the second body with the adjustment connecting portion; a step of relatively moving the first joint and the second joint in the perpendicular direction while maintaining the height; and moving the first joint and the second joint relatively in the longitudinal direction while maintaining the height. How to install expansion joints.

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