JP2007113274A - Stopper device for bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stopper device for bridge having a simple structure and capable of using an existing steel stopper bar and designing a steel cylindrical body fitted in it by a conventional design method. <P>SOLUTION: In this stopper device 5 for bridge constituted by burying and fixing a lower part of the steel stopper bar 2 into a lower part structure 1 of an abutment or bridge pier and storing an upper part of the steel stopper bar 2 in an anchor cap 4 buried and fixed in an upper part structure 3, a diameter enlarged part 7 formed by enlarging outside diameter is provided in an intermediate part 6 of the steel stopper bar on a lower side than the upper part structure 3, and a lower part of the diameter enlarged part 7 is buried in the lower part structure 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bridge stopper device provided over a lower structure such as an abutment or a pier and an upper structure such as a girder.

  As a displacement restriction device (movement restriction device) or a fall-bridge prevention device for bridges, anchor bars, ie vertical steel stopper bars, are used to embed and fix the lower part in substructures (undercarriage) such as abutments or piers, and also to girders, etc. A stopper device having a fixed structure in which the upper portion of the stopper bar is accommodated in the anchor cap through a slight gap on the upper structure side of the main structure or a main girder in the bridge axis direction or the like between the steel stopper rod and the anchor cap. 2. Description of the Related Art A stopper structure having a movable structure that accommodates a relatively large gap with an amount of expansion and contraction is known (see Non-Patent Document 1, for example).

  The steel stopper bar (anchor bar) in the stopper device in the displacement limiting device (movement limiting device) or the falling bridge prevention device is, for example, checked by the degree of shear stress, and according to the road bridge support manual of Non-Patent Document 1, the shear stress In order to ensure the load resistance when checking at a degree, the gap between the upper structure and the lower structure needs to be ½ or less of the diameter dimension of the steel stopper bar (anchor bar). Are listed.

  The reason is that the steel stopper bar (anchor bar) is designed with an allowable shear stress as described above. However, as in the stopper device 18 shown in FIG. 14, the upper structure 3 and the lower structure are designed. When the gap L between the steel stopper rod 2 and the steel stopper rod 2 increases, the bending span of the steel stopper rod intermediate portion 6 in the portion between the lower structure 1 and the upper structure 3 increases. When the diameter dimension of the bar 2 is not increased, when the horizontal force acts on the upper and lower structures 1 and 3 during an earthquake, the proof stress of the steel stopper bar 2 is reduced.

  For this reason, it is necessary to increase the diameter dimension of the steel stopper bar 2 by an amount corresponding to the increase in the gap interval L. Conventionally, the diameter dimension of the steel stopper bar 2 has been increased.

  The gap L is determined by the height H of the support device 8 interposed between the upper and lower structures 1 and 3, and the gap L extends in parallel with the bridge axis direction. When the space between the main girders 9 arranged at intervals in the direction perpendicular to the bridge axis is wide and there is sufficient space around the steel stopper rod 2, the steel on the upper surface of the lower structure 1 A concrete bearing part (not shown) for supporting the stopper rod 2 made of concrete is raised integrally, or the lower part of the upper structure 3 such as the main girder 9 and the end cross girder 10 is downed and the concrete bearing part ( The gap interval L between the lower structure 1 and the upper structure 3 is narrowed by providing them integrally (not shown).

  For example, although illustration is omitted, concrete around the steel stopper rod 2 is placed in a narrow work space, or a concave groove is provided for lowering to form a concrete support by the upper formwork. It was.

  However, like the main girder 9 such as the precast hollow girder 9a, the interval between the main girder X adjacent in the lateral direction is narrow, and the elastic bearing device 8a having the rubber layer 17 integrally between the mounting steel plates 16 at the upper and lower ends. When using a type B bearing device (feature: the amount of movement of the superstructure depends on the shear deformation of the rubber layer, the rubber thickness increases and the bearing height tends to increase) Since it is difficult to provide a concrete support portion on either side of the upper structure 3 including the main girder 9 or the end cross beam 10 connecting these ends and the lower structure 1, When it is difficult to cover the anchor bar by providing a concrete support portion, when the concrete support portion is not provided, the clearance L between the upper and lower structures is increased, and the diameter of the steel stopper rod 2 is 1 / 2 or less Since Rukoto is difficult, it will correspond with the use of those thick large diameter diameter members total length of the steel stopper rod 2 in opposite.

  Further, as described above, a stopper device 18a shown in FIGS. 11 to 13 is also conceivable as a stopper device for improving the steel stopper rod 2 so as not to use a large diameter steel rod over its entire length. The structure of the stopper device 18a is an anchor in which the lower part of the steel stopper bar 2 is embedded and fixed in the lower structure 1 such as an abutment or a pier, and the upper part of the steel stopper bar 2 is embedded and fixed in the upper structure 3. In the bridge stopper device adapted to be accommodated in the cap 4, a steel cylindrical body 7a is fitted to the stopper rod intermediate portion 6 in the portion between the lower structure 1 and the upper structure 3, and the steel cylindrical shape is fitted. This is a bridge stopper device 18 a in which the body 7 a is placed on the lower structure 1.

In the bridge stopper device 18a as described above, a bending force is borne by the steel cylindrical body 7a, and the steel stopper rod 2 is supported and restrained from bending deformation at this portion, and the steel stopper rod is supported. 2 is a stopper device 18a that reduces the burden of the bending force 2 and expects the steel stopper rod 2 near the upper end of the steel tubular body 7a to bear a shearing force.
Road bridge support manual July 10, 1991 P180 Road Bridge Specification Manual V Seismic Design March 7, 2002 P241, P256

  However, as shown in FIG. 11, in the stopper device 18a improved as described above, a horizontal force acts in the bridge axis direction or the like at the time of an earthquake or the like, and the upper structure 3 and the lower structure 1 are relative to each other. When the horizontal displacement is made, the lower portion of the steel cylindrical body 7a is not fixed. Therefore, when an upward force is applied, the steel cylindrical body 7a may slide up in the longitudinal direction of the steel stopper rod 2. There is a possibility that the bending deformation of the steel stopper rod 2 cannot be restricted because only the own weight of the steel tubular body 7a is acting downward.

  The present invention does not cause the enlarged portion of the steel tubular body or the like to slide up with respect to the steel stopper rod, and the bending portion of the steel stopper rod bears a bending resistance by the enlarged diameter portion of the steel tubular body or the like. The load of force can be reduced, and the expected effect can be reliably achieved by the enlarged diameter portion of the steel cylindrical body, etc., and the steel stopper rod can be made thick over the entire length of the member as in the prior art. A simple structure that can be used to design a diameter-enlarged part such as a steel tubular body by using a conventional design method (examination of bending stress) without using a steel member with a diameter. An object is to provide a stopper device for a bridge.

  In order to solve the above-mentioned problems advantageously, in the bridge stopper device of the first invention, the lower part of the steel stopper bar is embedded and fixed in a lower structure such as an abutment or a bridge pier, and the upper part of the steel stopper bar is fixed. In the bridge stopper device adapted to be housed in an anchor cap embedded and fixed in the upper structure, a diameter-enlarged portion with a larger outer diameter is provided in the middle portion of the steel stopper bar below the upper structure. And the lower part of an enlarged diameter part is embedded in the lower structure, It is characterized by the above-mentioned.

  In the second invention, in the bridge stopper device of the first invention, the steel tubular body is either fitted to the steel stopper rod, fixed by welding, welded, or screwed or integrally provided. The enlarged diameter part is formed by being provided by one means.

  In the third invention, in the bridge stopper device of the first or second invention, the outer diameter D of the enlarged-diameter portion 7 takes into account the gap dimension L between the lower structure 1 and the upper structure 3. It is characterized by a dimension that can ensure bending strength.

  In the fourth invention, in the bridge stopper device according to any one of the first to third inventions, an elastic packing is interposed between the upper end portion of the enlarged diameter portion 7 and the lower surface of the upper structure 3. It is characterized by.

  According to the first aspect of the present invention, the intermediate portion of the steel stopper rod is enlarged by the enlarged diameter portion simply by providing the enlarged diameter portion in the intermediate portion of the steel stopper rod and embedding the lower portion of the enlarged diameter portion in the lower structure. The rigidity can be increased and the rigidity can be increased so that it can resist the bending force at the time of the earthquake by the enlarged diameter part, and the bending force acting on the steel stopper rod at this part (bending stress) can be reduced. It is possible to reduce the shear force from the vicinity of the upper end of the enlarged diameter portion to the steel stopper bar. Further, since the diameter-expanded portion is simply provided in the steel stopper rod and the lower portion thereof is embedded in the lower structure, the workability is good and the proof stress of the steel stopper rod can be improved. In addition, according to the present invention, for example, when an existing steel stopper rod is used and a diameter-enlarged portion is added thereto, it can be changed to the stopper device of the present invention. It is possible to design a bridge stopper device with a simple structure that can be designed by checking) and that has an enlarged diameter portion. Even if the enlarged diameter part is a separate body, the enlarged diameter part is embedded in the lower structure, so that the steel stopper bar is not inclined as in the prior art, and the enlarged diameter part is made of the steel stopper bar. Can eliminate the risk of sliding up.

  According to the second invention, the enlarged diameter portion is formed by fitting a steel cylindrical body to a steel stopper bar or by fixing the steel cylindrical body to the steel stopper bar by welding. The steel cylindrical body is provided by being screwed to the steel stopper bar or provided integrally with the steel stopper bar. Since it is easy to provide a diameter portion and various diameter-expanded portions are possible, an inexpensive bridge stopper device with a high degree of freedom is obtained.

  According to the third aspect of the present invention, the outer diameter dimension D of the enlarged diameter portion 7 is simply set to a dimension that can ensure the bending strength considering the gap dimension L between the lower structure and the upper structure. The outer diameter of the intermediate part of the steel stopper bar, which requires a large bending moment and increased rigidity, can be increased indirectly without using a steel member with a large diameter over the entire length. In some cases, the outer diameter D of the enlarged diameter portion 7 can be made smaller than twice the gap dimension L, compared with the case of designing with the degree of shear stress.

  According to the fourth invention, between the enlarged diameter portion and the lower surface of the upper structure, by simply interposing the elastic packing on the enlarged diameter portion, ensuring the clearance between the enlarged diameter portion and the upper structure, It is possible to prevent the superstructure and the enlarged diameter portion from interfering with each other. Therefore, for example, it is possible to prevent the upper structure and the diameter-enlarged portion from interfering with each other at the time of rotation using the support device due to the bending of the upper structure as a fulcrum.

  Next, the present invention will be described in detail with reference to the drawings.

  FIGS. 1-7 shows the construction procedure until it comprises the stopper apparatus 5 of embodiment of this invention, First, as shown in FIG. 1 and FIG. 2, lower structures 1 such as an abutment or a pier. An elastic bearing device 8a (8) similar to the above is installed at an interval in the direction perpendicular to the bridge axis.

  An anchor hole 11 is drilled in the center between the main girders 9 on the upper surface of the lower structure 1 in advance and after the elastic bearing device 8 is installed, or before the elastic bearing device 8 and the main girder 9 are installed. In addition, the anchor hole 11 has a lower portion of the steel stopper bar 2 accommodated and arranged vertically as an anchor bar, and a cylindrical shape made of a steel cylindrical body fitted in the middle portion of the steel stopper bar 2. The lower portion of the enlarged diameter portion 7 is disposed in the anchor hole 11 and fixed upright by a non-shrink mortar 12 filled in the anchor hole 11.

  The said enlarged diameter part 7 says the part provided in the intermediate part of the steel stopper rod 2 so that a cross section may expand to the axial direction in this invention. Therefore, the expanded diameter portion 7 includes a case where it is provided directly integrally with the steel stopper rod 2, or a case separate from the steel stopper rod 2 is provided by fitting, fixing, screwing or welding, etc. Various forms are possible as will be described later.

When installing the expanded diameter portion 7 made of a steel tubular body, the non-shrink mortar 12 is filled into the anchor hole 11 until the expanded diameter portion 7 is near the lower surface level of the planned installation position, and the steel stopper rod In a state where 2 is fixed, the expanded diameter portion 7 is fitted to the steel stopper rod 2 and the non-shrink mortar 12 is filled around the expanded diameter portion 7 so that the lower portion of the expanded diameter portion 7 is embedded. Then, the enlarged diameter portion 7 may be embedded and fixed in the lower structure 1.
Further, the expanded diameter portion 7 is fitted at a predetermined position in the middle portion of the steel stopper rod 2, and the expanded diameter portion 7 is held on the steel stopper rod 2 by an appropriate clamp fitting and is made of steel. The anchor rod 2 and the lower portion of the enlarged diameter portion 7 may be disposed in the anchor hole 11 and filled with the non-shrink mortar 12 to be embedded and fixed on the lower structure 1 side. In order to enhance adhesion between the enlarged diameter portion 7 and the non-shrink mortar 12, the outer peripheral surface of the enlarged diameter portion 7 may be a rough surface.

  By embedding or fixing the lower portion of the enlarged diameter portion 7 on the lower structure 1 side, the lateral position of the enlarged diameter portion 7 is fixed, and horizontal force is applied to the upper structure 3 (or during an earthquake, etc. When acting on the substructure 1), the steel stopper rod 2 is supported by the enlarged diameter portion 7 so as not to bend, and the steel stopper rod 2 may be bent and deformed as in the past. This is important in eliminating the fear that the diameter-expanded portion 7 such as a steel cylindrical body slides up in the axial direction of the steel stopper rod 2. As a form in the case where the enlarged diameter portion 7 such as a steel tubular body is fitted and arranged on the steel stopper rod 2, the gap between the inner peripheral surface of the enlarged diameter portion 7 and the outer peripheral surface of the steel stopper rod 2 is slight. There may be a gap, and the gap 7 may be filled with a filler such as an adhesive to fix the enlarged diameter portion 7 to the steel stopper rod 2 integrally.

  The diameter-expanded portion 7 is a substantially solid steel cylindrical body excluding the stopper rod insertion hole, and has increased bending rigidity and shear rigidity.

The inner diameter of the enlarged diameter portion 7 is set to be slightly larger than the outer diameter of the steel stopper rod 2, and the projecting dimension of the enlarged diameter portion 7 from the lower structure 1 is the lower structure 1 and the main girder 9. Is set slightly shorter than, for example, about 20 mm, and the outer diameter D (see FIG. 8) of the enlarged-diameter portion 7 is larger than a dimension that can ensure bending strength. Is set.
For comparison, for example, in order to ensure the load bearing capacity when the enlarged diameter portion 7 is designed with an allowable shear stress, the gap dimension L is 1/2 or less of the outer diameter D of the enlarged diameter portion 7. (The outer diameter D of the enlarged diameter portion 7 should be at least twice the gap dimension L). However, when designing by checking the bending stress, the gap dimension L and the steel stopper rod 2 Since it is determined by the bending moment M due to the horizontal load P acting on the dimensional relationship, the dimensional relationship in the case of designing with the allowable shear stress degree (the outer diameter D of the enlarged diameter portion 7 should be at least twice the gap dimension L). For example, when the upper structure 3 is a lightweight structure, the assumed horizontal load P can be reduced, and the outer diameter D of the enlarged diameter portion 7 can be less than twice the gap dimension L. In some cases, the design can be economical depending on the site.

  Next to the state of FIG. 2, as shown in FIG. 3, an elastic packing 13 made of a resin foam is fitted on the steel stopper rod 2 and placed on the upper surface of the enlarged diameter portion 7. A hollow main girder 9 made of a precast hollow girder (precast concrete hollow girder) 9a is installed in the support device 8a.

  The elastic packing 13 is a partial bottom portion of an end cross beam (a fulcrum cross beam supported by the elastic support device 8a) 10 to be built over the main beams 9 adjacent in the horizontal direction perpendicular to the bridge axis later. It is also a packing that doubles as a formwork. The planar outer diameter dimension of the elastic packing 13 is appropriately formed into an annular shape or the like depending on the interval between the main girds 9, and has the same outer diameter as the enlarged diameter portion 7 such as a steel tubular body as shown in FIG. An annular packing may be used.

  By the elastic packing 13, the main structure 9 including the main beam 9 such as the precast hollow beam 9a and the end beam 10 which integrates the main beam 9 with each other at the end, and a diameter-enlarged portion such as a steel tubular body. 7 to prevent the upper structure 3 and the enlarged diameter portion 7 such as a steel tubular body from contacting and interfering with each other. Center rotation is allowed.

  The elastic packing 13 also serves as a mold for closing the lower surface of the steel anchor cap 4 placed on the elastic packing 13.

  Although illustration is omitted, when the end cross beam 10 is constructed, in order to secure a space between the lower structure 1 and the upper structure 3, foamed polystyrene or the like is placed on the lower structure 1 with steel. It arrange | positions as a formwork (illustration omitted) in parts other than the enlarged diameter part 7, such as a cylindrical body.

  Next, as shown in FIG. 4, the steel anchor cap 4 is placed on the elastic packing 13, and then, adjacent to the direction perpendicular to the bridge axis as shown in FIGS. 5 to 7. A frame (not shown) is appropriately installed in order to build an end cross beam 10 that connects the matching main beam end portions 9b, and the outer side of the main beam 9 within the mold frame or between the main beams 9 A steel bar (not shown) is placed on the outer side of the main girder 9 and the concrete 15 is placed between the outer side of the main girder 9 and the end of the main girder, and the laterally tightened PC steel ( (Not shown) is laterally tightened, and the end cross beams 10 are built, and the upper structure 3 in which the main beams 9 and the end cross beams 10 are integrated is built.

  Note that by allowing the projecting dimension of the enlarged diameter portion 7 from the lower structure 1 to be set to be approximately 20 mm smaller than the gap dimension L, the bending behavior of the upper structure 3 including the end cross beam 10 is allowed. Has been.

  The material of the enlarged diameter portion 7 is preferably the same as the material of the steel stopper rod 2, and the protruding length dimension of the enlarged diameter portion 7 between the lower surface of the upper structure 3 and the upper surface of the lower structure 1 is the upper structure. It is desirable to remove a gap for absorbing construction errors that is ½ or less (for example, about 20 mm) of the diameter of the steel stopper rod 2 from the gap interval L between 3 and the lower structure 1. Further, the length dimension in the vertical direction of the enlarged diameter portion 7 is the sum of the protrusion length dimension and the depth dimension embedded in the lower structure 1.

  In FIG. 8, the vicinity of the enlarged diameter portion 7 is enlarged, and a dimensional relationship between the steel stopper rod 2 and the enlarged diameter portion 7 and one form of the installation position of the enlarged diameter portion 7 are shown. The inner diameter of the enlarged diameter portion 7 should be about d + 2 to 4 mm with respect to the diameter d of the steel stopper rod 2, and it may be fitted with a slight gap of about 1 to 2 mm on one side in the radial direction. The outer diameter D may be, for example, 1.5d to 4d (1.5 to 4 times the diameter of the steel stopper steel rod 2) or a diameter determined by bending calculation. Moreover, the embedding depth P of the enlarged diameter portion 7 such as a steel tubular body may be, for example, three times or more (3d or more) of the diameter d of the steel stopper rod 2. In the form shown in FIG. 8, the protruding length dimension L1 of the enlarged diameter portion 7 such as a steel tubular body is set to, for example, 100 mm, the embedded length dimension P is set to about 80 mm, and the elastic packing 13 The thickness L3 is set to about 20 mm. The embedded length of the steel stopper rod 2 on the lower structure 1 side is embedded and fixed in the lower structure 1 so as to ensure 10 times (10d) the diameter (d). Therefore, the enlarged diameter portion 7 can be securely fixed to the lower structure 1 by being integrated with or fixed to the steel stopper rod 2, and the enlarged diameter portion 7 is embedded in the lower structure 1 and is disposed laterally. What is necessary is just to fix the position of a direction, and what is necessary is just to set the embedding length of the enlarged diameter part 7 suitably.

  The embedded depth P at the lower part of the enlarged diameter portion 7 ensures that the outer peripheral surface of the enlarged diameter portion 7 and the non-shrink mortar 12 adhere to each other, and prevents the enlarged diameter portion 7 from coming out. Is a dimension that is taken into consideration so as not to come out to the upper surface of the lower structure 1 and rotate with the steel stopper rod 2. Therefore, it is sufficient if it is not less than the embedding depth dimension P. In addition, it is good also as the enlarged diameter part 7 which protrudes a flange to the lower end part of the said enlarged diameter part 7, and has a stopper for prevention from falling out which consists of a flange.

  As a form in which the enlarged diameter portion 7 is provided, a steel tubular body may be formed by being fitted or fixed to the steel stopper bar 2 as in the above form. The expanded body 7 may be formed by fixing the body to the steel stopper rod 2 by welding, or a female screw is provided on the inner surface of the steel cylindrical body, and a male screw is provided in the middle portion of the steel stopper rod 2 May be formed by screwing a steel cylindrical body and appropriately fixing the enlarged diameter portion 7 or by providing a stepped shaft-shaped enlarged diameter portion integrally with the steel stopper rod 2. The diameter portion 7 may be formed.

  When the enlarged diameter portion 7 is fixed to the intermediate portion of the steel stopper rod 2, the positioning when installing the enlarged diameter portion 7 is automatically determined by the installation of the steel stopper rod 2. Therefore, since it can be installed together with the steel stopper rod 2, the construction of the bridge stopper device is easy, and the existing steel stopper 2 is added with the enlarged diameter portion 7 such as a steel tubular body. As a result, it is an inexpensive bridge stopper device.

  When the present invention is carried out, as shown in FIG. 10, the embedded length of the steel stopper rod 2 below the enlarged diameter portion 7 is 10 times the diameter (d) of the steel stopper rod 2 (10d). ) If the length is shorter, a nut or steel material is placed under the steel stopper bar 2 to prevent the steel stopper bar 2 from being pulled out when a pulling force is applied to the steel stopper bar 2. If the locking projection 19 is provided by being fixed by screwing or welding, the fixing effect with the non-shrink mortar 12 can be enhanced, and the pulling out of the steel stopper rod 2 can be reliably suppressed. Since other configurations are the same as those of the above-described embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  In the bridge stopper device 5 having such a structure, when a horizontal force is applied to the lower structure 1 or the upper structure 3 during an earthquake or the like, the force to bend the steel stopper rod 2 is expanded. It is supported and restrained by the diameter portion 7, and the bending force is borne by the enlarged diameter portion 7. Therefore, the burden of the bending force on the steel stopper rod 2 can be reduced, and the enlarged diameter portion 7 The steel stopper bar 2 is subjected to a shearing force from a position close to the upper structure 3 near the end.

  As described above, in the above-described embodiment, the existing steel stopper rod 2 can be used, and the diameter-expanded portion 7 such as a steel tubular body can be designed by a conventional design method (bending stress check). And it can be set as the stopper apparatus for bridges of a simple structure.

  When practicing the present invention, the main girder 9 can be applied to an upper structure including a main girder such as a cross-sectional I-girder or T-girder other than the precast hollow girder 9a.

The construction procedure of the stopper device for a bridge according to the present invention is shown in which an anchor hole is drilled on the upper surface of the lower structure and the lower portion of the steel stopper rod is embedded and fixed, an elastic bearing device is installed, and a precast hollow girder It is a vertical front view which shows the state shown by the dashed-two dotted line. It is a partially expanded vertical front view which expands and shows a part of FIG. It is a longitudinal front view which shows the state which fitted and arrange | positioned the packing of the resin foam to the steel stopper stick | rod from the state of FIG. 1, and installed the precast hollow girder. It is a longitudinal front view which shows the state which installed the steel anchor cap on the elastic packing from the state of FIG. It is a vertical front view which shows the state which built the edge part cross beam from the state of FIG. It is a vertical front view which shows the whole edge part cross beam in FIG. It is a partial longitudinal cross-sectional side view which shows the state which integrated the beam | girder of the bridge axial direction with the edge part cross beam constructed | assembled at the both ends. It is a partial longitudinal section front view showing one form of dimensional relation near an enlarged diameter part. It is a perspective view which shows the state which fitted the steel cylindrical body and packing to the steel stopper stick | rod. It is a partially vertical front view which shows the form which provides a latching protrusion in the lower part of steel stopper bars. It is a vertical front view which shows the whole edge part cross beam provided with the conventional improved stopper apparatus. It is a longitudinal front view which expands and shows a part of FIG. FIG. 12 is a partially longitudinal side view showing a state in which the bridge-axis-direction girder is integrated by the end cross girders that are provided with the conventional improved stopper device shown in FIG. It is a vertical front view which shows the conventional stopper apparatus which does not install a steel cylindrical body in a steel stopper stick | rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Substructure 2 Steel stopper rod 3 Upper structure 4 Anchor cap 5 Stopper device 6 for bridge 6 Stopper rod middle portion 7 Expanded portion 8 Bearing device 8a Elastic bearing device 9 Main beam 9a Precast hollow beam 10 End cross beam 11 Anchor hole 12 Non-shrink mortar 13 Elastic packing 15 Concrete 16 Mounting steel plate 17 Rubber layer 18 Stopper device 18a Stopper device 19 Locking protrusion

Claims (4)

  In a bridge stopper device in which the lower part of a steel stopper bar is embedded and fixed in a lower structure such as an abutment or a pier, and the upper part of the steel stopper bar is accommodated in an anchor cap embedded and fixed in the upper structure. The bridge is characterized in that a diameter-expanded portion with a larger outer diameter is provided in the middle portion of the steel stopper bar below the upper structure, and the lower portion of the diameter-expanded portion is embedded in the lower structure. Stopper device.   The diameter-enlarged portion is formed by providing the steel tubular body to the steel stopper bar by any one of the fitting arrangement, fixing by welding, or screw joining or integrally provided. The bridge stopper device according to claim 1.   The outer diameter dimension (D) of the enlarged diameter part is a dimension capable of ensuring a bending strength in consideration of a gap dimension (L) between the lower structure and the upper structure. Or a bridge stopper device according to 2;   The bridge stopper device according to any one of claims 1 to 3, wherein an elastic packing is interposed between an upper end portion of the enlarged diameter portion and a lower surface of the upper structure.

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