JP2007016389A - Fixed elastic support structure for bridge, and erection method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed elastic support structure for a bridge, which is structurally simple, which makes a construction cost low and which can resist a horizontal force in all directions and upward lift during earthquakes, and an erection method for the support structure. <P>SOLUTION: In this fixed elastic support structure for the bridge, a lower shoe, which is fixed to a lower structure, an elastic load bearing plate, and an upper shoe, which is fixed to an upper structure, are arranged in sequence. Characteristically, a central shear key member, one end of which is fixed to the central part of the lower or upper shoe, is inserted into a through-hole which is formed in the elastic load bearing plate; a large-diameter part, which is formed at the other end of the central shear key member, is engaged with an engaging cut part which is formed in the upper or lower shoe; and the central shear key member is equipped with functions of a shear key in all horizontal directions, and an upper-lift stopper. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a fixed elastic bearing structure for a bridge which is provided between an upper structure such as a bridge girder and a lower structure such as a pier or an abutment and which resists a bridge load, an uplift force and a horizontal force acting during an earthquake, and a method of erection thereof. .

Conventionally, as shown in FIG. 5, in the bridge fixed elastic bearing structure 100 in which the lower rod 102 fixed to the lower structure 101, the elastic load support plate 103, and the upper rod 105 fixed to the upper structure 104 are arranged, In order to prevent breakage of the elastic load support plate 103 due to horizontal force and uplift during a large earthquake, a pair of side blocks 106 are arranged in the bridge axis direction and the direction orthogonal to the bridge axis direction, respectively. There is one in which horizontal deformation is limited and an upper lift stop member 107 is arranged on the side block 106.
JP 2001-3314 A

  However, even if side blocks that prevent deformation of the elastic load support plate due to horizontal force are provided in the direction of the bridge axis and in the direction perpendicular to the bridge axis, the horizontal force at the time of the earthquake is omnidirectional. There was a problem that deformation of the elastic load support plate could not be prevented. And arranging the side blocks in the direction of the bridge axis and in the direction perpendicular to it makes it difficult to arrange the side blocks in a narrow space, increases the number of parts, and makes construction difficult. It had the problem of becoming a structure.

  The present invention provides a fixed elastic bearing structure for a bridge that can solve the above-described problems, has a simple structure, is inexpensive in construction cost, and can resist horizontal force and lifting force in all directions at the time of an earthquake, and a method for installing the same. With the goal.

  In order to solve the above-mentioned problem, the first invention of the present invention is a bridge fixed elastic bearing structure in which a lower anchor fixed to the lower structure, an elastic load support plate, and an upper anchor fixed to the upper structure are arranged in order. In a fixed elastic bearing structure, a central shear key member with a circular cross section with one end fixed to the center part of the lower or upper collar is inserted into a through hole having substantially the same diameter as the central shear key member formed on the elastic load support plate. A large-diameter portion is formed at the other end of the central shear key member, and the large-diameter portion is engaged with an engagement cut portion formed on an upper collar or a lower collar. It has a function as a shear key in all directions and a function of a top lift stop.

  According to a second aspect of the present invention, in the fixed elastic bearing structure for a bridge according to the first aspect of the invention, the large-diameter portion of the central shear key member is screwed and attached to the end of the central shear key member as a separate member. .

  According to the third aspect of the present invention, in the fixed elastic bearing structure for a bridge according to the first or second aspect of the present invention, the engagement disconnection portion formed on the upper collar or the lower collar is formed on a metal plate fixed to the lower collar or the upper collar. It is characterized by being formed around the perforated hole.

  The fourth invention is characterized in that in the elastic bearing structure for fixing a bridge according to any one of the first to third inventions, the elastic load support plate and the central shear key member are integrally formed by integral vulcanization molding. To do.

  The fifth aspect of the present invention is a method of laying a fixed elastic support structure for a bridge, wherein one end of a central shear key member having a circular cross section is provided at the central portion of either a lower anchor fixed to the lower structure or an upper anchor fixed to the upper structure. And inserting the central shear key member into a metal plate provided with a through hole having substantially the same diameter as the central shear key member formed on the elastic load support plate and a through hole formed with an engagement cutout in the periphery, A large-diameter portion is fixed to the other end portion of the central shear key member, and the large-diameter portion is engaged with an engagement cut portion formed around the through hole of the metal plate. And the metal plate and the elastic load supporting plate are fixed together.

In the fixed elastic bearing structure for a bridge according to the present invention, in the fixed elastic bearing structure for a bridge in which a lower arm fixed to the lower structure, an elastic load support plate, and an upper arm fixed to the upper structure are sequentially arranged, the lower arm or the upper arm A central shear key member having a circular cross section with one end fixed to the central portion of the central shear key member is inserted into a through hole having substantially the same diameter as the central shear key member formed on the elastic load support plate, and the other end portion of the central shear key member The large-diameter portion is formed on the upper-side or the lower-side, and the central shear key member functions as a horizontal omnidirectional shear key. With a structure with a lift stop function, the central shear key member with a circular cross section arranged in the center can resist horizontal force in all directions and uplift in the horizontal direction during an earthquake, so the structure is simple and wasted space Fixed elastic bearings for bridges that do not require It can be granulated. In addition, the fixed elastic bearings for bridges do not require shear deformation of the elastic members of the elastic load support plate, and therefore do not require a gap between the central shear key member and the through hole of the elastic load support plate. Can be reduced to the minimum value, and the cost can be reduced.
The large diameter part of the central shear key member is attached as a separate member by screwing it to the end of the central shear key member, so that the engagement part formed on the upper collar or lower collar can be easily engaged with the large diameter section. Become.
With the configuration in which the engagement breaking portion formed on the upper collar or the lower collar is provided around the through hole formed in the metal plate, the engagement breaking portion with which the large diameter portion is engaged can be easily formed.
With the configuration in which the elastic load support plate and the central shear key member are integrally formed by integral vulcanization molding, the fixed arrangement on the lower arm becomes easy.
In the construction method of the fixed elastic bearing structure for bridges, one end of a central shear key member having a circular cross section is fixed to the center of either the lower anchor fixed to the lower structure or the upper anchor fixed to the upper structure. The shear key member is inserted into a metal plate having a through-hole having substantially the same diameter as the central shear key member formed on the elastic load support plate and a through-hole formed around the periphery, and the central shear key member A large-diameter portion is fixed to the other end, and the large-diameter portion is engaged with an engagement break formed around the through hole of the metal plate, and then the lower or upper collar, the metal plate, and the elastic With the structure in which the load supporting plate is fixed integrally, a construction method of the fixed elastic support structure for a bridge can be provided which has a small number of parts, can be easily attached in a narrow space, and has a low construction cost.

  Embodiments of the present invention will be described with reference to the drawings. 1-3 is a figure which shows one Embodiment of the fixed elastic bearing structure for bridges of this invention. The fixed elastic support structure 1 for a bridge is disposed between a lower structure 2 such as a bridge pier and an upper structure 3 such as a bridge girder. On the lower structure 2, an anchor member hole is formed, the anchor member 4 is inserted, and a non-shrink mortar is cast and integrated. The upper end of the anchor member 4 is fixed to the female screw cylinder 5 by welding or screwing. The upper end of the female screw cylinder 5 is disposed so as to protrude slightly above the surface of the lower structure 2. The non-shrink mortar cast in the anchor member hole is cast as a leveled mortar 6 on the surface of the lower structure 2 with a thickness reaching the upper end of the female screw cylinder 5 so that the surface is horizontal and smooth. . After the mortar has solidified, the base plate 7 as a lower arm is leveled and placed on the mortar 6. Bolt insertion holes 8 are formed at the four corners of the base plate 7, and bolts 9 are inserted therethrough and screwed into the female threads of the female screw cylinder 5, and the base plate 7 is leveled and fixed on the mortar.

  A central female screw hole 10 is formed in the center of the base plate 7. The lower end of the central shear key member 11 having a circular cross section is screwed into the central female screw hole 10 and fixed. For fixing the central shear key member 11 and the base plate 7, other fixing means such as welding may be used. A male screw portion 12 is engraved on the outer periphery of the upper end of the central shear key member 11. Instead of the male screw portion 12, a female screw hole may be formed in the center of the upper end surface of the central shear key member 11.

  An elastic load support plate 13 is attached to the central shear key member 11. The elastic load support plate 13 is configured by laminating an upper metal plate 14, a lower metal plate 15, an intermediate reinforcing metal plate 16, and an elastic layer 17 such as natural rubber. A central hole 18 for inserting the central shear key member 11 is formed at the center of the elastic load supporting plate 13. The inner diameter of the center hole 18 may be substantially the same as the outer diameter of the central shear key member 11 or may be 2 mm or less.

  A metal plate 19 having a through hole 20 is inserted into the central shear key member 11 into which the elastic load support plate 13 is inserted. Engagement disconnection portions 21 are formed around the through holes 20 of the metal plate 19. Further, the metal plate 19 is formed with a set bolt female screw 22 for fixing the upper plate fixed to the upper structure and a shear key engagement groove 23 for preventing horizontal displacement between the upper plate and the upper plate. Is done.

  A large-diameter portion 24 having a female screw portion 25 formed at the center is screwed to the male screw portion 12 at the outer periphery of the distal end of the central shear key member 11 inserted into the through hole 20 of the metal plate 19. Engage with the engaging break 21.

  A sole plate 26 as an upper collar is fixed to the upper structure 3 in advance by means such as welding. A set bolt hole 27 through which a set bolt 31 for fixing the metal plate 19 is inserted is formed in the sole plate 26. In addition, a space 28 for accommodating the upper portion of the large diameter portion 24 engaged with the engagement disengagement portion 21 of the metal plate 19 may be formed in the center of the sole plate 26. Further, the sole plate 26 is formed with a shear key engagement groove 29 with which a shear key 30 for preventing horizontal displacement from the metal plate 19 is engaged. A shear key 30 is engaged between a shear key engagement groove 23 of the metal plate 19 and a shear key engagement groove 29 formed in the sole plate 26. As a means for preventing horizontal displacement between the metal plate 19 and the sole plate 26, a means for forming a vertical flange around the sole plate 26 and preventing the metal plate 19 from moving in the horizontal direction may be employed.

  The sole plate 26 and the metal plate 19 as an upper collar are fixed with a set bolt 31, and the bridge elastic support structure 1 is disposed between the lower structure 2 and the upper structure 3.

  The operation of the embodiment of the present invention will be described. When an earthquake occurs and a large lifting force acts on the bridge elastic support structure 1, the large-diameter portion 24 engaged with the engagement breaking portion 21 of the metal plate 19 resists and controls the lifting force.

  When a horizontal force acts during an earthquake, the central shear key member 11 resists horizontal forces in all directions.

  FIG. 4 shows another embodiment of the present invention. A central female screw hole 10 is formed at the center of the sole plate 26 as an upper collar fixed to the upper structure 3 by means such as welding. A male screw portion formed on the outer periphery of the upper end of the central shear key member 11 is screwed into the central female screw hole 10 and fixed. The center shear key member 11 may be fixed at the center of the sole plate 26 by using a fixing means such as welding instead of screwing.

  The elastic load support plate 13 is attached to the central shear key member 11 whose upper end is fixed to the center of the sole plate 26. The elastic load support plate 13 is configured by laminating an upper metal plate 14, a lower metal plate 15, an intermediate reinforcing metal plate 16, and an elastic layer 17 such as natural rubber. A central hole 18 for inserting the central shear key member 11 is formed at the center of the elastic load supporting plate 13.

  A metal plate 19 having a through hole 20 is inserted into the central shear key member 11 into which the elastic load support plate 13 is inserted. Engagement disconnecting portions 21 are formed around the through holes 20 of the metal plate 19. Also, the metal plate 19 has a shear key mechanism for preventing horizontal displacement between the set plate female screw 22 for fixing to the base plate 7 as an upper collar fixed to the lower structure 2 and the base plate 7. A joint groove 23 is formed.

  A large-diameter portion 24 having a female screw portion 25 at the center is screwed to the male screw portion 12 at the outer periphery of the lower end of the central shear key member 11 inserted into the through hole 20 of the metal plate 19, and the large-diameter portion 24 is attached to the metal plate 19. Engage with the engaging break 21.

  On the lower structure 2, an anchor member hole is formed, the anchor member 4 is inserted, and a non-shrink mortar is cast and integrated. The upper end of the anchor member 4 is fixed to the female screw cylinder 5 by welding or screwing. The upper end of the female screw cylinder 5 is disposed so as to protrude slightly above the surface of the lower structure 2. The non-shrink mortar cast in the anchor member hole is cast as a leveling mortar 6 on the surface of the lower structure 2 with a thickness reaching the upper end of the female screw cylinder 5 so that the surface is horizontal and smooth. . After the mortar is solidified, the base plate 7 as a lower arm is leveled and placed on the mortar 6. Bolt insertion holes 8 are formed at the four corners of the base plate 7, and bolts 9 are inserted therethrough and screwed into the female threads of the female screw cylinder 5, and the base plate 7 is leveled and fixed on the mortar.

  A set bolt hole 27 through which a set bolt 31 for fixing the metal plate 19 is inserted is formed in the base plate 7. In addition, a space 28 for accommodating the upper portion of the large diameter portion 24 engaged with the engagement disengagement portion 21 of the metal plate 19 may be formed in the center of the base plate 7. The base plate plate 7 is formed with a shear key engagement groove 29 with which a shear key 30 for preventing a horizontal shift from the metal plate 19 is engaged. A shear key 30 is engaged between a shear key engagement groove 23 of the metal plate 19 and a shear key engagement groove 29 formed in the sole plate 26.

  The base plate 7 and the metal plate 19 as a lower rod are fixed with a set bolt 31, and the elastic support structure 1 for a bridge is disposed between the lower structure 2 and the upper structure 3.

A method of attaching the fixed elastic bearing structure 1 for a bridge according to the present invention will be described in accordance with the procedure.
(1) The anchor member 4 and the female screw cylinder 5 are embedded and fixed in the lower structure 2, and a horizontal and smooth leveling mortar 6 is formed on the surface of the lower structure 2.
(2) After curing the mortar, the base plate 7 is leveled and placed on the mortar 6, and the base plate 7 is fixed by screwing the bolt 9 and the female screw cylinder 5.
(3) The lower end of the central shear key member 11 is fixed to the center of the base plate 7. The center shear key member may be fixed to the center of the base play 7 by screws or welding, or may be fixed to the base plate in advance.
(4) The elastic load supporting plate 13 and the metal plate 19 are inserted into the central shear key member 11, the large diameter portion 24 is fixed to the tip of the central shear key member 11, and the large diameter portion 24 is disconnected from the metal plate 19. Engage with part 22. The base plate 7 may be fixed to the lower structure 2 after the elastic load support plate 13, the metal plate 19, and the large diameter portion 24 are installed on the base plate 7 in advance.
(5) The shear key 20 is disposed in the shear key engagement groove 23 of the metal plate 19.
(6) The shear key engaging groove 29 and the set bolt hole 27 of the sole plate 26 fixed to the upper structure 3 are aligned with the shear key engaging groove 23 of the metal plate 19 and the female screw hole 22 for the set bolt. Then, the metal plate 19 and the sole plate 26 are fixed with the set bolt 31, and an elastic bridge support is installed between the upper structure 3 and the lower structure 2.

  The construction method of the bridge fixed elastic support structure of the embodiment shown in FIG. 4 is performed in the reverse procedure of the bridge fixed elastic support structure of the embodiment shown in FIGS.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows a prior art.

Explanation of symbols

1: Fixed elastic support structure for bridge 2: Lower structure 3: Upper structure 4: Anchor member 5: Female screw cylinder 6: Leveling mortar 7: Base plate 8: Bolt insertion hole 9: Bolt 10: Central female screw hole 11: Center Shear key member 12: Male thread portion 13: Elastic load support plate 14: Upper metal plate 15: Lower metal plate 16: Intermediate reinforcing metal plate 17: Elastic layer 18: Center hole 19: Metal plate 20: Through hole 21: Disengagement Part 22: female screw hole for set bolt 23: engaging groove for shear key 24: large diameter part 25: female screw part 26: sole plate 27: hole for set bolt 28: void 29: shear key engaging groove 30: shear key 31: Set bolt

Claims (5)

Cross-section with one end fixed to the center of the lower or upper arm in the fixed elastic bearing structure for bridges in which the lower arm fixed to the lower structure, the elastic load support plate, and the upper arm fixed to the upper structure are arranged in order A circular central shear key member is inserted into a through-hole having substantially the same diameter as the central shear key member formed on the elastic load support plate, a large diameter portion is formed at the other end of the central shear key member, and the large diameter The central shear key member is provided with a function as a shear key in all directions in the horizontal direction and a function of stopping the upper lifting force. Fixed elastic bearing structure for bridges. 2. The fixed elastic bearing structure for a bridge according to claim 1, wherein the large-diameter portion of the central shear key member is screwed and attached to an end portion of the central shear key member as a separate member. 3. The bridge according to claim 1 or 2, wherein the engagement breaking portion formed on the upper collar or the lower collar is formed around a through hole formed in a metal plate fixed to the lower collar or the upper collar. Fixed elastic bearing structure. The fixed elastic support structure for a bridge according to any one of claims 1 to 3, wherein the elastic load support plate and the central shear key member are integrally formed by integral vulcanization molding. One end of a central shear key member having a circular cross section is fixed to the central portion of either the lower anchor fixed to the lower structure or the upper anchor fixed to the upper structure, and the central shear key member is formed on the elastic load supporting plate. Inserted into a metal plate provided with a through-hole having substantially the same diameter as the central shear key member and a through-hole formed with an engagement disconnection portion around the central shear key member, and fixing the large-diameter portion to the other end of the central shear key member, The large diameter portion is engaged with an engagement cut portion formed around the through hole of the metal plate, and then the lower or upper collar, the metal plate and the elastic load supporting plate are fixed integrally. Construction method of fixed elastic bearing structure for bridge.

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