JP6822726B2 - Mounting aids and telescopic devices - Google Patents

Description

The present invention relates to a mounting aid and a telescopic device.

The telescopic device is provided at the end of the girder to absorb various displacements of the bridge, mainly displacement of the length of the bridge girder caused by temperature changes in the environment. This telescopic device is required to have a function of maintaining flatness between girder ends and preventing rainwater or the like from penetrating.

As such an expansion / contraction device, a technique including a pair of joints and a seal layer provided between the joints is disclosed (for example, Patent Document 1). The joint has a surface portion exposed to the bridge girder and an abdominal plate portion integrally formed with the surface portion.

The telescopic device must be attached to the girder end so that the distance and height between the pair of joints do not shift. In order to prevent slippage between the joints, a pair of guide members temporarily fixed to the pair of joints and a connecting means for connecting the guide members so as to move relative to each other so that the surface portion of the joint is flat. A mounting aid provided with the above is disclosed (for example, Patent Document 2). The mounting aid is removed after the joint is installed at the end of the girder. Patent Document 2 describes that the relative positional relationship between the pair of surface portions does not shift vertically, horizontally, etc., and the gap between the joint portions can be easily and accurately adjusted.

Japanese Unexamined Patent Publication No. 2004-100150 Japanese Unexamined Patent Publication No. 2006-52610

However, in Patent Document 2, when the guide member is fixed to the upper surface of the surface portion by welding, after the guide member is removed, the upper surface of the surface portion is finished smoothly and painted with the same paint as other portions. , It is necessary to process the surface part after installation. In recent years, for the purpose of improving the rust preventive power of telescopic devices, heavy anticorrosive coating (recoating of zinc ridge primer and epoxy resin paint) and metal spraying (aluminum / magnesium alloy spraying) are required for rust prevention treatment. is there. However, after removing the temporary fixing bracket, it is almost impossible to perform a rust preventive treatment on site with the same rust preventive power as when manufactured at the factory, due to the balance of construction time and equipment.

Further, if the rust preventive treatment is insufficient, rust is generated from the insufficient part. In particular, in cold regions, since the road surface antifreeze agent (sodium chloride, calcium chloride, etc.) is sprayed, corrosion is likely to appear remarkably.

An object of the present invention is to provide a mounting aid and an expansion / contraction device that do not require processing of the upper surface of a surface portion after installation.

The mounting aid according to the present invention is a mounting aid for a telescopic device provided at a girder end of a bridge and having a pair of joints, and is a horizontal plate portion arranged so as to cross the surface of the joint. And a leg portion integrally formed with the horizontal plate portion, and the leg portion is fixed to the side surface of the joint.

The telescopic device according to the present invention is characterized in that the above-mentioned mounting aid is provided.

According to the present invention, since the mounting aid is fixed to the telescopic device on the side surface of the joint, it is not necessary to process the upper surface of the surface portion after removing from the telescopic device. Therefore, the upper surface of the surface portion can be in a state of being rust-proofed in the factory.

It is a perspective view which shows the whole structure of the expansion / contraction device provided with the attachment assisting tool which concerns on this embodiment. It is a vertical cross-sectional view of the expansion / contraction device provided with the attachment assisting tool which concerns on 1st Embodiment. It is a side view of the expansion / contraction device provided with the attachment assisting tool which concerns on 1st Embodiment. It is a perspective view which shows the structure of the attachment assisting tool which concerns on 1st Embodiment. It is a vertical cross-sectional view which shows the use state of the telescopic device provided with the attachment assisting tool which concerns on 1st Embodiment. It is a vertical cross-sectional view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (1). It is a side view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (1). It is a vertical cross-sectional view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (2). It is a side view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (2). It is a vertical cross-sectional view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (3). It is a side view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (3). It is a vertical cross-sectional view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (4). It is a side view of the expansion / contraction device provided with the attachment assisting tool which concerns on the modification (4). It is a perspective view of the expansion / contraction device provided with the attachment assisting tool which concerns on 2nd Embodiment. It is a perspective view which shows the structure of the attachment assisting tool which concerns on 2nd Embodiment.

1. 1. First Embodiment Hereinafter, the first embodiment of the present invention will be described in detail with reference to the drawings. The expansion / contraction device 10 shown in FIGS. 1 and 2 is made of steel and includes a pair of joints 12 having the same length as the width of the bridge girder, and a plurality of anchor portions 13 provided in the longitudinal direction of the joints 12. ..

The joint 12 is made of an inverted L-shaped member, and has a surface portion 14 arranged on the surface side of the bridge girder and an abdominal plate portion 16 integrally formed with the surface portion 14. The surface portion 14 is made of a substantially rectangular plate member having the same length as the width direction (Y direction in the drawing) of the bridge girder, and one side surface in the longitudinal direction (hereinafter, referred to as “tip”) is the surface portion on the mating side. It is arranged so as to face the tip of 14.

The tip of the surface portion 14 is repeatedly formed with comb-teeth-like irregularities toward the mating side. A gap 18 is formed between the tips of the surface portions 14. The gap 18 formed between the tips of the surface portion 14 is formed by combining the irregularities of the surface portion 14. That is, the concave portion formed on the surface portion 14 of one joint 12 is paired with the convex formed on the surface portion 14 of the other joint 12, and the convex formed on the surface portion 14 of one joint 12 is formed. , It is paired with the recess formed on the surface portion 14 of the other joint 12. By combining the irregularities formed on the surface portion 14 in this way, the gap 18 between the tips of the surface portion 14 is formed in a zigzag shape.

The abdominal plate portion 16 is integrally formed at the base end of the surface portion 14, and is composed of a plate member provided at a right angle to the surface portion 14. An anchor portion 13 is provided on the outer surface of the abdominal plate portion 16. The anchor portion 13 is made of a substantially rectangular plate member, and is provided so as to project parallel to the surface of the abdominal plate portion 16 in the bridge axis direction (X direction in the drawing). The upper end of the anchor portion 13 is inclined downward toward the tip, and after installation, the blade of the snow removal grader is guided to escape upward to protect the joint 12 from being damaged by the blade.

Between the pair of joints 12, a dustproof layer 22, a support portion 21, a seal layer 24, and a backup layer 25 are directly below the surface portion 14 and are arranged in order from the top. The dustproof layer 22 is made of an elastic foam such as EPDM foam. The foam is not only composed of open cells, but may also contain closed cells and open cells.

The support portion 21 is a rectangular plate member having the same length as the longitudinal length of the joint 12, and is provided in each of the pair of joints 12 to prevent the seal layer 24 from being deformed. The support portion 21 is fixed to the lower surface of the surface portion 14 with a countersunk bolt or a round head bolt (not shown) via, for example, a hexagon nut as a holding portion 23 fixed to the lower surface of the surface portion 14. By using a countersunk bolt or a round head bolt, it is possible to prevent the seal layer 24 from being damaged.

The seal layer 24 is formed so as to prevent rainwater or the like from penetrating into the girder end portion and to expand and contract in accordance with the expansion and contraction of the gap 18. The seal layer 24 can be formed of elastic rubber, elastic foam, or the like.

In the support portion 21, one longitudinal side surface (hereinafter, referred to as “base end”) abuts on the abdominal plate portion 16, and a linear gap (book) is provided between the other longitudinal side surfaces (hereinafter, “tip”). (Not shown in the figure) is formed. The gap formed by the support portion 21 is arranged substantially in the center of the zigzag-shaped gap 18 formed between the tips of the surface portions 14 in a plan view.

The backup layer 25 is made of a member softer than the seal layer 24, and can be formed of, for example, urethane foam. The backup layer 25 is supported on the lower surface by a receiving plate 26 fixed to the abdominal plate portion 16.

The telescopic device configured as described above is further provided with a mounting aid 30A. The mounting aid 30A has a horizontal plate portion and a leg portion integrally formed with the horizontal plate portion. In the case of the present embodiment, the mounting aid 30A includes a first main body 32A and a second main body 34A. The first main body 32A and the second main body 34A are steel plate members, and have horizontal plate portions 36 and 40, respectively, and leg portions 38 and 42 integrally formed with the horizontal plate portions 36 and 40. .. The horizontal plate portions 36 and 40 are arranged so as to cross the surface portion 14 in the bridge axis direction. The legs 38 and 42 are formed at right angles to the horizontal plate portions 36 and 40 from the base ends of the horizontal plate portions 36 and 40 along the abdominal plate portion 16. The legs 38 and 42 are formed with protruding portions 35 and 37 protruding toward the abdominal plate 16 at the tip. The legs 38 and 42 are fixed to the surface of the abdominal plate 16 which is the side surface of the joint 12 by welding at the tips of the protrusions 35 and 37.

As shown in FIG. 3, the first main body 32A and the second main body 34A are connected by bolts 41 and nuts 43 in a state where the horizontal plate portions 36 and 40 are overlapped with each other. In the first main body 32A, an upper return portion 39 projecting toward the second main body 34A is formed at the upper end of the horizontal plate portion 36. The upper return portion 39 is formed by bending and molding the upper end of the horizontal plate portion 36. A gap 29 is formed between the horizontal plate portions 36 and 40 and the upper surface of the surface portion 14 of the joint 12.

As shown in FIG. 4, in the first main body 32A, a first bolt hole 44 and a first elongated hole 46 are formed in a horizontal plate portion 36. The first bolt hole 44 and the first elongated hole 46 are formed in series in the longitudinal direction of the horizontal plate portion 36. In the second main body 34A, a second bolt hole 50 and a second elongated hole 48 are formed in series in the horizontal plate portion 40 in the longitudinal direction of the horizontal plate portion 40. The second bolt hole 50 is formed at a position corresponding to the first elongated hole 46. The second elongated hole 48 is formed at a position corresponding to the first bolt hole 44.

In the first main body 32A and the second main body 34A, a bolt 41 is inserted from the first bolt hole 44 into the second elongated hole 48, the bolt 41 is fixed with a nut 43, and the first length is formed from the second bolt hole 50. The bolt 41 is inserted into the hole 46 and the bolt 41 is fixed with the nut 43 to be connected. The mounting aid 30A has a first slot 46 and a second slot 48, and by connecting the pair of joints 12 in a state where the gap 18 is adjusted to a predetermined length, the gap 18 is adjusted to a predetermined length. Can be held.

Next, a procedure of aligning the longitudinal direction of the telescopic device 10 provided with the mounting aid 30A with the width direction of the bridge girder and fixing it to the girder end of the bridge girder will be described. The telescopic device 10 provided with the mounting aid 30A, which has been transported to the installation site, is lifted by hanging a sling belt (not shown) around the anchor portion 13 and installed at the girder end portion.

When the sling is hung around the anchor portion 13 and lifted, bending stress is generated in the attachment auxiliary tool 30A at the horizontal plate portions 36 and 40 which are the connecting points of the first main body 32A and the second main body 34A. The mounting aid 30A is provided with a bending prevention mechanism. That is, the upper return portion 39 of the first main body 32A supports the upper end of the horizontal plate portion 40 of the second main body 34A, and the first main body 32A and the second main body 34A move from the first bolt hole 44 to the second elongated hole 48. The bolt 41 is inserted and the bolt 41 is fixed by the nut 43, and the bolt 41 is inserted from the second bolt hole 50 into the first slot 46 and the bolt 41 is fixed by the nut 43. .. The mounting aid 30A configured in this way is suspended at the anchor portion 13 and can prevent the relative positions of the pair of joints 12 from being displaced even when bending stress is generated.

After the telescopic device 10 is installed at the end of the girder, the mounting aid 30A is cut at the cutting portion (FIG. 2) 45 and removed from the telescopic device 10. As shown in FIG. 5, after removing the mounting aid 30A, concrete 15 is cast on the girder end portion 27. The remaining cut 49 remaining on the surface of the abdominal plate 16 of the joint is buried in the cast concrete 15.

As described above, since the mounting aid 30A is fixed to the telescopic device 10 not at the surface portion 14 but at the abdominal plate portion 16, it is necessary to process the upper surface of the surface portion 14 after removing it from the telescopic device 10. Absent. Therefore, the surface portion 14 can be in a state of being rust-proofed in the factory. Further, as compared with the conventional case in which the mounting assisting tool is attached to the upper surface of the surface portion 14, it is not necessary to process the upper surface of the surface portion 14 after removing the mounting assisting tool 30A. The work of fixing can be simplified. Further, since the gap 29 is formed between the horizontal plate portions 36 and 40 and the upper surface of the surface portion 14 of the joint 12, the entire surface portion 14 can be subjected to the rust preventive treatment.

When the temperature drops after the expansion / contraction device 10 is installed and the bridge girder contracts in the bridge axis direction, the clearance t (FIG. 5) between the girder end portions 27 increases. As a result, the expansion / contraction device 10 fixed to the girder end portion 27 has a wide gap 18. When the clearance t between the girder end portions 27 increases, the dustproof layer 22 and the seal layer 24 arranged between the joints 12 extend following the expansion between the girder end portions 27. Therefore, it is possible to prevent rainwater, dust, etc. that have entered the gap 18 from entering the girder end portion 27.

Further, when snow is piled up in a state where the gap 18 is widened and the snow is pushed into the gap 18 by a passing vehicle, the expansion / contraction device 10 receives the load of the support portion 21 arranged on the upper side of the seal layer 24. Therefore, it is possible to prevent the seal layer 24 from being deformed by the compressed snow.

In the case of the present embodiment, since the support portion 21 is fixed to the lower surface of the surface portion 14 via the holding portion 23, the moment generated by the force acting on the tip of the support portion 21 can be reduced. Conventionally, since the support portion 21 is fixed to the abdominal plate portion 16 at the base end, the moment generated by the force acting on the tip becomes large when the base end is the origin. On the other hand, in the case of the present embodiment, the support portion 21 is fixed to the surface portion 14, and the distance between the origin (in this case, the position of the holding portion 23) and the tip of the support portion 21 is shortened. As a result, the expansion / contraction device 10 can reduce the moment generated in the support portion 21, so that the deformation of the seal layer 24 can be prevented more reliably.

Further, the linear gap 28 formed by the support portion 21 is arranged substantially in the center of the zigzag-shaped gap 18 formed between the tips of the surface portions 14 in a plan view. By arranging the gap 28 in this way, the overlap between the gap 18 of the surface portion 14 and the gap 28 of the support portion 21 can be reduced, so that the expansion / contraction device 10 more reliably prevents the seal layer 24 from being deformed. can do.

When the temperature rises and the bridge girder extends in the bridge axis direction, the clearance t between the girder end portions 27 becomes narrower. As a result, the expansion / contraction device 10 fixed to the girder end portion 27 has a narrow gap 18. When the clearance t between the girder end portions 27 becomes narrower, the dustproof layer 22 and the seal layer 24 arranged between the joints 12 contract according to the contraction between the girder end portions 27. When the seal layer 24 shrinks, the backup layer 25 arranged on the lower side is deformed downward because the backup layer 25 is made of a member softer than the seal layer. That is, the backup layer 25 provided on the lower side of the seal layer 24 absorbs the deformation of the seal layer 24 on the lower side. As a result, in the expansion / contraction device 10, the seal layer 24 does not protrude from the gap 18 of the surface portion 14 of the joint 12 to the surface of the bridge girder.

Since the support portion 21 is arranged below the dustproof layer 22, it is not visible from the gap 18 formed between the tips of the surface portions 14. Therefore, the telescopic device 10 can improve the aesthetic appearance because the support portion 21 is not visible from the outside.

(Modification example)
The present invention is not limited to the above embodiment, and can be appropriately modified within the scope of the gist of the present invention.

In the case of the above embodiment, as a bending prevention mechanism, the upper return portion 39 of the first main body 32A supports the upper end of the horizontal plate portion 40 of the second main body 34A, and the first main body 32A and the second main body 34A form the first bolt. A bolt 41 is inserted from the hole 44 into the second slot 48 to fix the bolt 41 with a nut 43, and a bolt 41 is inserted from the second bolt hole 50 into the first slot 46 to insert the bolt 41 into the nut 43. Although the case where they are connected by fixing them with is described, the present invention is not limited to this.

For example, as shown in FIGS. 6 and 7, the mounting aid 30B has a groove 47 formed in the horizontal plate portion 36 of the first main body 32B and the first groove 47 formed so as to be movable in the groove 47. 2 It has the horizontal plate portion 40 of the main body 34A. The groove 47 is an upper return portion 39 provided at the upper end of the horizontal plate portion 36 of the first main body 32B and protruding toward the second main body 34A, and a lower side provided at the lower end and protruding toward the second main body 34A. It is formed by the return portion 51. The groove 47 supports the upper end and the lower end of the horizontal plate portion 40 of the second main body 34A by the upper return portion 39 and the lower return portion 51. As described above, in this modification, the horizontal plate portions 36 and 40 are supported by the upper return portion 39 and the lower return portion 51, so that the first main body 32B and the second main body 34A have a set of bolts 41 and nuts. It may be fixed at 43. That is, in the first main body 32B and the second main body 34A, the bolt 41 is inserted from the second bolt hole 50 (not shown) formed in the second main body 34A into the first elongated hole 46 formed in the first main body 32B. , The bolt 41 is connected by fixing it with the nut 43. The attachment assisting tool 30B according to the present modification is fixed to the abdominal plate 16 at the legs 38 and 42 and is provided with a bending prevention mechanism, so that the same effect as that of the above embodiment can be obtained. Further, the bending prevention mechanism has a groove 47 formed in the horizontal plate portion 36 of the first main body 32B and the horizontal plate portion 40 of the second main body 34A formed so as to be movable in the groove 47. Therefore, since it can be connected by a set of bolts 41 and nuts 43, the number of parts can be reduced as compared with the above embodiment.

Further, as shown in FIGS. 8 and 9, the mounting aid 30C includes an upper return portion 39 provided at the upper end of the horizontal plate portion 36 of the first main body 32A and protruding toward the second main body 34B, and a second main body. It has a lower return portion 52 provided at the lower end of the horizontal plate portion 40 of the 34B and projecting toward the first main body 32A. As described above, in this modified example, since the horizontal plate portions 36 and 40 are supported by the upper return portion 39 and the lower return portion 52, the first main body and the second main body are connected by a pair of bolts 41 and nuts 43. You may. The attachment assisting tool 30C according to the present modification is fixed to the abdominal plate 16 at the legs and is provided with a bending prevention mechanism, so that the same effect as that of the above embodiment can be obtained.

In the case of the above embodiment, the configuration in which the mounting aid 30A is fixed to the abdominal plate portion 16 by welding has been described, but the present invention is not limited to this. For example, as shown in FIGS. 10 and 11, the bolts 41 and nuts 43 may be used for fixing. In this case, the fixing plate portions 58 and 60 are fixed to the abdominal plate portion 16 of the joint 12 by welding. Bolt holes (not shown) are formed in the fixing plate portions 58 and 60. Bolt holes (not shown) are formed in the legs 38 and 42 of the first main body 54 and the second main body 56, respectively, corresponding to the bolt holes of the fixing plate portions 58 and 60. With the legs 38 and 42 and the fixing plates 58 and 60 overlapped, the bolt 41 is inserted into the bolt hole, and the bolt 41 is fixed with the nut 43 to fix the mounting aid 30D to the telescopic device 10. be able to. The attachment assisting tool 30D according to this modification can obtain the same effect as that of the above embodiment by being fixed to the abdominal plate portion 16 at the leg portion and by providing the bending prevention mechanism. Further, since the first main body 54 and the second main body 56 are fixed to the telescopic device 10 with bolts 41 and nuts 43, they can be reused after being removed from the telescopic device 10.

In the case of the above embodiment, the mounting auxiliary tool 30A has described the configuration having the first main body 32A and the second main body 34A, but the present invention is not limited to this. For example, as shown in FIGS. 12 and 13, the first main body and the second main body may be integrated. In the case of this figure, the attachment auxiliary tool 30E is composed of one plate member, and includes a horizontal plate portion 62 and leg portions 64 formed along the abdominal plate portion 16 from both ends of the horizontal plate portion 62. In the case of this modification, the bending prevention mechanism is composed of a single horizontal plate portion 62. The attachment assisting tool 30E according to the present modification is fixed to the abdominal plate portion 16 at the leg portion 64 and is provided with a bending prevention mechanism, so that the same effect as that of the above embodiment can be obtained. Further, since the horizontal plate portion 62 is a single unit, the length of the gap 18 is fixed to the length of the horizontal plate portion 62, but the bolt 41 and the nut 43 can be omitted. Therefore, as compared with the above embodiment, The number of parts can be reduced.

2. 2. Second Embodiment Hereinafter, the second embodiment of the present invention will be described in detail with reference to the drawings. The mounting aid according to the present embodiment is different from the first embodiment in that it can be applied to a large-sized telescopic device as compared with the first embodiment. The expansion / contraction device 70 shown in FIG. 14 is made of steel and includes a pair of joints 72 having the same length as the width of the bridge girder, and a plurality of anchor portions 73 provided in the longitudinal direction of the joints 72.

The joint 72 has a plate-shaped surface portion 74 arranged on the surface side of the bridge girder, and a belly plate portion 76 composed of an L-shaped member integrally formed with the surface portion 74. The surface portion 74 is made of a substantially rectangular plate member having the same length as the width direction (Y direction in the drawing) of the bridge girder, and one side surface in the longitudinal direction (hereinafter, referred to as “tip”) is the surface portion on the mating side. It is arranged so as to face the tip of 74. The thickness of the surface portion 74 is about 28 to 100 mm.

A gap 78 is formed between the tips of the surface portion 74. The gap 78 formed between the tips of the surface portion 74 is formed by combining the irregularities of the surface portion 74.

The upper end of the abdominal plate portion 76 is joined to the lower surface of the surface portion 74. The anchor portion 73 is joined to the side surface 75 of the surface portion 74 and the outer surface of the abdominal plate portion 76. The anchor portion 73 is made of a substantially rectangular plate member, and is provided so as to project parallel to the bridge axis direction (X direction in the drawing) from the outer surface of the abdominal plate portion 76. The upper end of the anchor portion 73 is inclined downward toward the tip end.

A dry sealing material 79 is arranged between the pair of joints 72. As the dry sealing material 79, it is preferable to use a material in which a waterproof film and an elastic portion are integrated. Open cell foams having different elastic moduli are alternately arranged in the stretchable portion. The dry sealing material 79 is supported on the lower surface by a receiving plate 80 fixed to the abdominal plate portion 76.

The telescopic device 70 configured as described above is further provided with a mounting aid 82. The mounting aid 82 has a horizontal plate portion and a leg portion integrally formed with the horizontal plate portion. In the case of the present embodiment, the mounting aid 82 includes a first main body 84 and a second main body 86.

As shown in FIG. 15, the first main body 84 and the second main body 86 are steel plate members, and the horizontal plate portions 88 and 94 and the legs integrally formed with the horizontal plate portions 88 and 94, respectively. It has parts 89 and 95. The horizontal plate portions 88 and 94 are arranged so as to cross the surface portion 74 in the bridge axis direction. The legs 89 and 95 are formed at right angles to the horizontal plate portions 88 and 94 from the base ends of the horizontal plate portions 88 and 94. The legs 89, 95 are formed with projecting portions 99, 100 protruding toward the side surface of the surface portion at the tip thereof. The legs 89, 95 are fixed to the side surface 75 of the surface portion 74, which is the side surface of the joint 72, by welding at the tips of the protruding portions 99, 100 (FIG. 14).

The first main body 84 and the second main body 86 are connected by bolts 41 and nuts 43 in a state where the horizontal plate portions 88 and 94 are overlapped with each other. In the first main body 84, an upper return portion 90 projecting toward the second main body 86 is formed at the upper end of the horizontal plate portion 88. The upper return portion 90 is a plate-shaped member, and is joined to the upper end of the horizontal plate portion 88 by welding. A gap is formed between the horizontal plate portions 88 and 94 and the upper surface 77 of the surface portion 74.

The first main body 84 has a first bolt hole 92 and a first elongated hole 91 formed in the horizontal plate portion 88, and a third elongated hole 93 formed in the upper return portion 90. The first bolt hole 92 and the first elongated hole 91 are formed in series in the longitudinal direction of the horizontal plate portion 88. The third elongated hole 93 is formed parallel to the longitudinal direction of the horizontal plate portion 88. The second main body 86 is provided with a second bolt hole 97, a second elongated hole 96, and a nut 98 in the horizontal plate portion 94. The second bolt hole 97 and the second elongated hole 96 are formed in series in the longitudinal direction of the horizontal plate portion 94. The second bolt hole 97 is formed at a position corresponding to the first elongated hole 91. The second elongated hole 96 is formed at a position corresponding to the first bolt hole 92. The nut 98 is fixed to the surface of the horizontal plate portion 94 by welding at a position corresponding to the third elongated hole 93.

In the first main body 84 and the second main body 86, a bolt 41 is inserted from the first bolt hole 92 into the second elongated hole 96, the bolt 41 is fixed with a nut 43, and the first length is formed from the second bolt hole 97. The bolt 41 is inserted into the hole 91 and the bolt 41 is fixed with the nut 43 to be connected. Since the mounting aid 30A has a first slot 91 and a second slot 96, the gap 78 is held at a predetermined length by connecting the pair of joints 72 with the gap 78 adjusted to a predetermined length. can do.

Further, by fixing the bolt 41 inserted into the third elongated hole 93 with the nut 98, the positions of the first main body 84 and the second main body 86 in the height direction can be matched.

Next, a procedure of aligning the longitudinal direction of the telescopic device 70 provided with the mounting aid 82 with the width direction of the bridge girder and fixing it to the girder end of the bridge girder will be described. The telescopic device 70 provided with the mounting aid 82, which has been transported to the installation site, is lifted by hanging a sling belt (not shown) around the anchor portion 73, and is installed at the girder end portion.

When the sling is hung around the anchor portion 73 and lifted, bending stress is generated in the attachment auxiliary tool 82 at the horizontal plate portions 88 and 94, which are the connecting points of the first main body 84 and the second main body 86. The mounting aid 82 includes a bending prevention mechanism. That is, the upper return portion 90 of the first main body 84 supports the upper end of the horizontal plate portion 94 of the second main body 86, and the first main body 84 and the second main body 86 move from the first bolt hole 92 to the second elongated hole 96. The bolt 41 is inserted and the bolt 41 is fixed by the nut 43, and the bolt 41 is inserted from the second bolt hole 97 into the first elongated hole 91 and the bolt 41 is fixed by the nut 43. .. Further, by tightening the bolt 41 inserted into the third elongated hole 93 into the nut 98, the positions of the first main body 84 and the second main body 86 in the height direction can be matched.

Even if the expansion / contraction device 70 is larger than that of the above embodiment, the mounting assist tool 82 configured in this way is relative to the pair of joints 72 when it is suspended by the anchor portion 73 and bending stress is generated. It is possible to more reliably prevent the target position from shifting.

Since a gap is formed between the horizontal plate portions 88 and 94 and the upper surface 77 of the surface portion 74, the same effect as that of the first embodiment can be obtained.

In the case of the present embodiment, the case where the nut 98 is fixed to the horizontal plate portion 94 of the second main body 86 and the bolt 41 inserted into the third elongated hole 93 is fixed by the nut 98 has been described, but the present invention is limited to this. Instead, the bolt 41 and the nut 98 may be replaced. Specifically, the bolt 41 is fixed to the horizontal plate portion 94 of the second main body 86, the tip of the bolt 41 is inserted into the third elongated hole 93, and the nut 98 is tightened and fixed to the tip of the bolt 41. May be. In this case, the bolt 41 fixed to the second main body 86 can be inserted into the third elongated hole 93 by covering the second main body 86 with the first main body 84 from above.

10 Telescopic device 12 Joint 14 Surface part 16 Sternum part 18 Gap 21 Support part 22 Dustproof layer 23 Holding part 24 Seal layer 27 Girder end part 29 Gap 30A, 30B, 30C, 30D, 30E Mounting aids 32A, 32B 1st body 34A, 34B 2nd main body 36,40 Horizontal plate 38,42 Leg 39 Upper return 41 Bolt 43 Nut 44 1st bolt hole 46 1st slot 47 Groove 48 2nd slot 50 2nd bolt hole 51, 52 Lower return part 54 1st main body 56 2nd main body 62 Horizontal plate part 64 Leg part

Claims (13)

A mounting aid for telescopic devices provided at the girder end of a bridge and equipped with a pair of joints.
A horizontal plate portion arranged so as to traverse the surface of the joint and a leg portion integrally formed with the horizontal plate portion are provided, and the leg portion is fixed to the side surface of the joint. Mounting aids to be installed. A first main body and a second main body having the horizontal plate portion and the leg portion are provided.
The mounting aid according to claim 1, wherein the first main body and the second main body are connected to each other in a state where the horizontal plate portions are overlapped with each other via a bending prevention mechanism. The bending prevention mechanism is
A groove formed in the horizontal plate portion of the first main body and
The mounting aid according to claim 2, further comprising the horizontal plate portion of the second main body formed so as to be movable in the groove. The bending prevention mechanism is
An upper barb portion provided at the upper end of the horizontal plate portion of the first main body and projecting toward the second main body,
The mounting aid according to claim 2, further comprising a lower return portion provided at the lower end of the horizontal plate portion of the second main body and projecting toward the first main body. The bending prevention mechanism is
A first bolt hole and a first elongated hole formed in the first main body, and an upper barb portion provided at the upper end of the horizontal plate portion and protruding toward the second main body.
A second bolt hole corresponding to the first slot and a second bolt hole corresponding to the first bolt hole formed in the second main body.
A bolt to be inserted from the first bolt hole into the second slot and a nut to fix the bolt,
The mounting aid according to claim 2, further comprising a bolt to be inserted from the second bolt hole into the first elongated hole and a nut for fixing the bolt. The bending prevention mechanism is
The third elongated hole provided in the upper return portion and
It has a bolt inserted into the third slot and a nut for fixing the bolt.
The mounting aid according to claim 5, wherein the bolt or the nut is fixed to the horizontal plate portion of the second main body. Any of claims 1 to 6, wherein the joint has a surface portion and an abdominal plate portion integrally formed with the surface portion, and is fixed to the abdominal plate portion at the leg portion. The mounting aid described in item 1. Any of claims 1 to 6, wherein the joint has a surface portion and an abdominal plate portion integrally formed with the surface portion, and is fixed to the side surface of the surface portion at the leg portion. Or the mounting aid described in item 1. The mounting aid according to claim 7 or 8, wherein the telescopic device is provided with a gap between the horizontal plate portion and the surface portion. A telescopic device provided with the mounting aid according to any one of claims 1 to 9. A seal layer arranged so as to close between the pair of the joints is provided.
The surface portion is formed with comb-teeth-like irregularities protruding toward the mating side.
The expansion / contraction device according to claim 10, wherein a support portion for preventing deformation of the seal layer is fixed to the surface portion. 11. The telescopic device according to claim 11, wherein the support portion is fixed to the surface portion via a holding portion. The telescopic device according to claim 12, wherein a dustproof layer is formed between the surface portion and the support portion.

Images