JP2009097299A - Apparatus for stopping lift force - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lift force stopping apparatus capable of stably suppressing lift force applied to a superstructure, easily installed and having high versatility. <P>SOLUTION: A locking frame 8 rotatably connected to a first frame 4 by a first horizontal shaft 5 is locked to a flange part 12a of a flange-like base part 12 projected below a bridge girder 11, and the first frame 4 is adjusted in its vertical position and fixed by a positioning-fixing bolt 3 to the upper end of a support rod 2 projected upward from a bridge pier 13, so that the horizontal shaft 5 and the support rod 2 are orthogonal to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an upper lift stop device that is installed independently of a rubber bearing body together with a rubber bearing body between an upper structure and a lower structure, and more specifically, stabilizes the upper lifting force that acts on the upper structure. The present invention relates to a lifting force stopping device that can be suppressed and is easy to install and highly versatile.

  In the structure of the bridge, for the purpose of absorbing expansion and contraction due to temperature changes of the bridge girder and bending due to load, etc., a structure in which the bridge girder is installed via a rubber support installed on the pier is adopted. It has become. In the bridge installed with this rubber bearing body, for example, when the height of the bridge girder is excessive compared to the support distance in the width direction of the bridge girder, or when excessive horizontal force in the direction perpendicular to the bridge axis acts on the bridge girder, etc. In addition, an upward force (uplift force) may be generated against the bridge girder. When it is necessary to suppress such upward lifting force, a pinch plate portion is provided on the upper surface of the rubber support fixed to the upper structure in order to restrict the upward movement of the upper structure. An upper lifting force stop device for restricting the upward movement of the upper structure separately from the rubber bearing body together with the rubber bearing body, or by providing a locking member for locking in addition to the lower arm fixed to the lower structure (For example, refer to Patent Document 1).

  When an additional member such as a pinch plate is provided on the rubber bearing body, the rubber bearing body becomes larger, and the shape and size of the laminated body, which is an important basic member, can be freely set to secure a space for the additional member. There is a problem that the structure of the rubber bearing body is restricted. This problem can be solved by providing an upper lift stop device separately from the rubber bearing.

However, as exemplified in Patent Document 1, the upper lifting force stop device independent of the conventional rubber bearing body vertically locks the pinch plate portion and the locking member (the protruding portion of the side block). In addition, they are designed to be installed with a predetermined gap therebetween. For this reason, in order to install the two without interfering with each other, it is necessary to position each member with high accuracy, and there is a problem that a high level technique is required for the installation work. In addition, the upper lift stop device has a dedicated design corresponding to the vertical distance between the upper structure and the lower structure, and therefore, in the same specification, between another upper structure and lower structure with different vertical distances, It could not be installed as it was and lacked versatility.
JP 2000-11115 A

  An object of the present invention is to provide an uplifting stop device that can stably suppress an uplift force acting on an upper structure, is easy to install, and has high versatility.

  In order to achieve the above object, the upper lift stop device of the present invention is an upper lift stop device installed independently of a rubber bearing body together with a rubber bearing body between an upper structure and a lower structure. A locking frame that can be engaged with and disengaged from a flange-like base projecting below an object and a support bar projecting upward from the lower structure are centered on a first horizontal axis perpendicular to the support bar. And a positioning fixing means for adjusting the vertical position of the locking frame connected to the support rod.

  Here, the locking frame and the support rod may be coupled so as to be rotatable about a second horizontal axis orthogonal to the first horizontal axis. Further, the support rod is formed of, for example, a PC steel material. A sliding member may be provided on a contact surface of the locking frame with the flange-shaped base, and the locking frame locked to the flange-shaped base may be configured to be slidable with respect to the flange-shaped base.

  According to the lifting force stopping device of the present invention, the locking frame that can be engaged with and disengaged from the flange-like base portion protruding below the upper structure and the support bar protruding upward from the lower structure are supported. Since it is connected so as to be rotatable about a first horizontal axis orthogonal to the rod, the lifting force acting on the upper structure can be suppressed, and the first horizontal axis is orthogonal to the main moving direction of the upper structure. Thus, when the upper structure moves, the locking frame rotates around the first horizontal axis. Therefore, it becomes difficult to generate a bending moment in the support rod, and the support rod has a structure that bears a tensile force exclusively, so the durability of the support rod is improved and it is possible to suppress the lifting force stably for a long period of time. .

  Furthermore, by providing positioning fixing means for adjusting the vertical position of the locking frame connected to the support bar, the locking frame can be adjusted and fixed to an appropriate vertical position of the support bar when installing the apparatus. Therefore, installation work can be performed easily. In addition, it is not limited between the upper structure and the lower structure having a certain vertical distance, and can be installed between various upper structures and lower structures having different vertical distances. Have.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lifting force stopping device of the present invention will be described based on an embodiment shown in the drawings, taking as an example a case where an upper structure is a bridge girder and a lower structure is a bridge pier. In the drawings, the X direction indicates the bridge axis direction, and the Y direction indicates the direction perpendicular to the bridge axis.

  As illustrated in FIGS. 1 and 2, the upper lift stop device 1 of the present invention is installed separately from the rubber support 10 together with the rubber support 10 between the bridge girder 11 and the bridge pier 13. The rubber support 10 has a structure in which a laminated body 10c in which rubber layers and steel plates are alternately laminated is interposed between an upper collar 10a and a lower collar 10b. This rubber bearing body 10 supports the load of the bridge girder 11, absorbs the bending of the bridge girder and the expansion and contraction in the bridge axis direction X, and exhibits a seismic isolation effect during an earthquake. In addition, the rubber bearing body 10 is installed in various structures such as a sliding bearing body that allows the bridge girder 11 to move only in the direction of the bridge axis and a sliding bearing body that allows movement in all directions in the plane. The upper lifting force stopping device 1 functions to suppress the upward movement of the bridge girder 11 when an upward lifting force acting upward on the bridge girder 11 is generated.

  As shown in FIGS. 3 and 4, the upper lift stop device 1 has a locking frame 8 that contacts and locks the upper surface of the flange portion 12 a of the flange-like base portion 12 protruding below the bridge girder 11. Yes. The locking frame 8 can be engaged with and disengaged from the flange portion 12a. The first horizontal shaft 5 penetrates horizontally through the locking frame 8 and the first frame 4 positioned below the locking frame 8, and fixing bolts 5 a are screwed into both ends of the first horizontal shaft 5. ing. The locking frame 8 and the first frame 4 are rotatably connected by the first horizontal shaft 5.

  In the first frame 4, the support bar 2 protruding upward from the bridge pier 13 penetrates vertically, and a screw groove is provided in a range of a predetermined length from the upper end of the support bar 2. The first frame 4 is fixed to a predetermined vertical position of the support bar 2 by positioning fixing bolts 3 screwed into the upper end portion of the support bar 2.

  In this way, the locking frame 8 can rotate with respect to the support bar 2 around the first horizontal shaft 5 orthogonal to the support bar 2. Further, the vertical position of the locking frame 8 connected to the support bar 2 can be adjusted by a positioning fixing bolt 3 screwed into the upper end portion of the support bar 2. That is, the positioning fixing bolt 3 screwed to the upper end portion of the support bar 2 penetrating the first frame 4 vertically serves as a positioning fixing means for adjusting the vertical position of the locking frame 8 connected to the support bar 2. . When installing the upper lifting force stopping device 1, the positioning fixing bolt 3 is fastened to the support bar 2 to adjust the vertical position of the locking frame 8, for example, a position where a slight tensile force is applied to the support bar 2. Secure with.

  In the present invention, since the positioning fixing bolt 3 is provided, the locking frame 8 can be appropriately adjusted and fixed to an appropriate vertical position of the support bar 2 when installing the upper lifting force stopping device 1. . Accordingly, in order to prevent the flange portion 12a and the locking frame 8 from interfering with each other, it is not necessary to position both with high accuracy as in the prior art, and the installation work can be easily performed. Further, since the vertical position of the locking frame 8 can be adjusted according to the vertical distance between the bridge girder 11 and the pier 13, it has a highly versatile structure that can be installed between various bridge girder 11 and pier 13 having different vertical distances. Yes.

  Here, when an uplift force acts on the bridge girder 11, the support bar 2 serves as a main tensile strength member and suppresses the upward movement of the bridge girder 11. When the bridge girder 11 moves in the bridge axis direction due to expansion and contraction, etc., the first horizontal axis 5 is arranged so as to be orthogonal to the bridge axis direction, so that the locking frame 8 rotates around the first horizontal axis 5. To do. Therefore, a bending moment hardly occurs in the support bar 2, and the support bar 2 having the lower end embedded in the bridge pier 13 bears almost only the tensile force. As a result, the durability of the support rod 2 is improved, and it is possible to suppress the lifting force stably for a long period of time without bending deformation.

  The support rod 2 can be either solid or hollow, and the material is formed of steel or the like as with other constituent members. By forming the support rod 2 from a PC steel material, the diameter can be further reduced. In the present invention, since the support bar 2 is a tensile member, it has an advantageous structure to make the upper lift stop device 1 compact. To make the support bar 2 compact by forming it with a PC steel material. It becomes more advantageous. Further, the upper lifting force stopping device 1 can be installed separately from the rubber bearing body 10 and further requires a smaller installation space. Therefore, the upper lifting force stopping device 1 has a high degree of installation freedom and may be installed at an optimal position for suppressing the upper lifting force. It becomes possible.

  Here, as illustrated in FIG. 5, the sliding member 9 may be provided on the contact surface of the locking frame 8 with the flange portion 12 a. With this configuration, the locking frame 8 locked to the flange portion 12a can slide in the bridge axis direction with respect to the flange-shaped base portion 12. Therefore, when the amount of movement of the bridge girder 11 in the direction of the bridge axis is large and the rotation of the locking frame 8 around the first horizontal axis 5 becomes the limit and the rotation cannot be performed, the locking frame 8 is Since it slides in the direction of the bridge axis with respect to the base 12, the bending deformation of the support bar 2 can be prevented.

  In the locking frame 8 of FIG. 5, the sliding member 9 is provided on the surface facing the upper surface and the side surface of the flange portion 12a. However, the sliding member 9 may be provided only on the surface facing the upper surface of the flange portion 12a.

  6 and 7 show another embodiment of the upper lift stop device 1. In this embodiment, a mechanism for rotating the locking frame 8 relative to the support bar 2 when the bridge girder 11 moves in the direction perpendicular to the bridge axis is added to the embodiment illustrated in FIGS. Therefore, differences from the embodiment illustrated in FIGS. 3 and 4 will be described.

  The first frame 4 has a connecting end 4a protruding downward. A second horizontal shaft 7 orthogonal to the first horizontal shaft 5 penetrates the connection end 4a horizontally, and further penetrates the second frame 6 positioned below the first frame 4 horizontally. Fixing bolts 7 a and 7 a are screwed to both ends of the second horizontal shaft 7. By the second horizontal shaft 7, the first frame 4 and the second frame 6 are rotatably connected.

  In the second frame 6, the support bar 2 protruding upward from the bridge pier 13 penetrates vertically, and a screw groove is provided in a range of a predetermined length from the upper end of the support bar 2. The second frame 6 is fixed to a predetermined vertical position of the support bar 2 by positioning fixing bolts 3 screwed into the upper end portion of the support bar 2. In this way, the locking frame 8 can rotate with respect to the support bar 2 around the second horizontal axis 7 orthogonal to the first horizontal axis 5.

  In this embodiment, when the bridge girder 11 moves in the direction perpendicular to the bridge axis due to an earthquake or the like, the second horizontal axis 7 is arranged to be orthogonal to the direction perpendicular to the bridge axis, so that the locking frame 8 is in the second horizontal direction. It rotates about the axis 7. Therefore, a bending moment is hardly generated in the support bar 2, and the support bar 2 having the lower end portion embedded in the bridge pier 13 bears almost only the tensile force. Thus, in addition to the movement of the bridge girder 11 in the direction of the bridge axis, the locking frame 8 can be rotated with respect to the support bar 2 for the movement in the direction perpendicular to the bridge axis, thereby further improving the durability of the support bar 2. It becomes possible.

  Also in this embodiment, as illustrated in FIG. 5, the sliding member 9 is provided on the contact surface of the locking frame 8 with the flange portion 12a, and the locking frame 8 locked to the flange portion 12a is connected to the flange. The base 12 can be configured to be slidable in the bridge axis direction.

  The present invention is not limited to the bridge girder 11 and the pier 13 respectively, and the present invention can be applied to other civil engineering structures and buildings.

It is a side view of the bridge which installed the upper lifting stop device of the present invention. It is AA sectional drawing of FIG. FIG. 2 is a front view illustrating an embodiment of an upper lift stop device of FIG. 1. FIG. 4 is a side view of FIG. 3. It is a front view which shows the modification of embodiment of FIG. It is a front view which illustrates another embodiment of an upper lift stopper. FIG. 7 is a side view of FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper lift stop device 2 Support bar 3 Positioning fixing bolt 4 First frame 4a Connection end 5 First horizontal shaft 5a Fixing bolt 6 Second frame 7 Second horizontal shaft 7a Fixing bolt 8 Locking frame 9 Sliding member 10 Rubber bearing 10a Upper gutter 10b Lower gutter 10c Laminate 11 Bridge girder (superstructure)
12 Flange-shaped base 12a Flange 13 Bridge pier (substructure)

Claims (4)

  In the upper lift stop device that is installed independently of the rubber bearing body with the rubber bearing body between the upper structure and the lower structure, it can be engaged with and disengaged from the flange-shaped base projecting below the upper structure. A locking frame and a support bar projecting upward from the lower structure are coupled to be rotatable about a first horizontal axis perpendicular to the support bar and coupled to the support bar An upper lift stop device provided with positioning and fixing means for adjusting the vertical position of the frame.   The upper lifting force stop device according to claim 1, wherein the locking frame and the support rod are rotatably connected around a second horizontal axis orthogonal to the first horizontal axis.   The upper lift stop device according to claim 1 or 2, wherein the support bar is made of a PC steel material.   A sliding member is provided on a contact surface of the locking frame with the flange-shaped base, and the locking frame locked to the flange-shaped base is slidable with respect to the flange-shaped base. The upper lift stop device according to any one of the above.