JP4661573B2 - Installation method of elastic bearings for structures - Google Patents

Description

  In the present invention, when a concrete bridge girder or other concrete structure is erected on a lower structure such as a bridge pier through an elastic support for a structure, elastic shrinkage and creep drying shrinkage due to prestressing of the concrete structure are performed. The present invention relates to a method for installing an elastic support for a structure that can absorb and significantly reduce the shear deformation of the elastic support for a structure.

JP-A-6-173220

  For example, in Patent Document 1, a lower plate of an elastic support is temporarily fixed to a lower structure, a concrete upper structure is constructed on the upper plate of the elastic support, and then the horizontal structure is placed on the upper structure. Prestress is introduced and left for a certain period from the introduction of this prestress. After that, the temporary fixation between the lower plate and the lower structure is released, and the amount of elastic contraction due to the prestress of the upper structure and after the prestress is introduced. In addition to the amount to eliminate the horizontal shear deformation of the rubber bearing interposed between the upper and lower plates of the elastic bearing based on the creep drying shrinkage amount, it was also predicted from the creep drying shrinkage amount after prestressing The lower plate is moved in the horizontal direction by an amount that compensates for the horizontal shear deformation of the rubber base based on the amount based on the amount of residual creep drying shrinkage. Installation method of construction for the elastic support member for fixing the over preparative the lower structure has been proposed.

  By the way, in such a method for installing an elastic support for a structure, when the concrete upper structure is long, the amount of elastic shrinkage and creep drying shrinkage due to prestress generated in the upper structure are increased. Therefore, the amount of movement of the lower plate relative to the lower structure is increased, and the size of the lower structure needs to be increased in accordance with this increase, although it is not necessary mechanically. In addition to the time and effort required to design the object, the material cost of the structure may increase.

  In addition, in such an installation method of the elastic support body for a structure, in order to move the lower plate in the horizontal direction with respect to the lower structure, the construction of the upper structure is modified or changed after the construction of the lower structure. When the dimensions are further increased, it is difficult to eliminate the amount of shear deformation of the rubber bearing after final installation as a result of the maximum movement of the rubber bearing relative to the lower structure being limited by the dimensions of the lower structure. In addition, when a rubber bearing body in which shear deformation remains is used, a larger rubber bearing body is selected in order to ensure safety, so that it is difficult to reduce the cost of the structure.

  In addition, in such an installation method of the elastic support for a structure, in order to move the lower plate in the horizontal direction with respect to the lower structure, a tool or the like used for the movement is placed on the lower structure at an actual construction site. However, as a result of narrowing the mounting area of the tool or the like on the lower structure, it is difficult to maintain and improve the workability related to the installation of the elastic support.

  The present invention has been made in view of the above-mentioned points, and an object of the present invention is to reduce the amount of shear deformation of the rubber bearing body after final installation as much as possible and to provide an excessively large substructure. An elastic support for a structure that can optimally design a substructure without the need for it, can reduce the cost of the structure, and can also maintain and improve the workability of installing the elastic support It is to provide an installation method.

  The method of installing an elastic bearing body for a structure according to the present invention includes a rubber bearing body, an upper plate attached to the upper surface of the rubber bearing body, and a lower plate attached to the lower surface of the rubber bearing body. Is fixed to the lower structure, and the upper plate is temporarily fixed to the lower surface of the upper structure. After a certain period of time has elapsed since the temporary fixing, the upper plate is temporarily fixed to the upper structure and the rubber bearing is sheared. The upper plate is moved in the horizontal direction with respect to the upper structure with a movement amount for removing the deformation, and after this movement, the upper plate is fixed to the lower surface of the upper structure.

  According to the method of installing the elastic support for a structure of the present invention, in particular, in order to move the upper plate in the horizontal direction with respect to the upper structure, the upper plate is not restricted by the size of the lower structure. It can be moved in the direction, and when the structure is completed, the amount of shear deformation of the rubber bearing body can be made as small as possible to make the elastic bearing body almost upright. It is possible to construct a structure capable of exhibiting a desired performance against vibrations of the motor, and to reduce the need to select a rubber bearing body larger than a rubber bearing body having a mechanically required size. The lower structure can be optimally designed without considering the amount of horizontal movement of the lower plate relative to the lower structure, and an increase in the material cost of the structure (particularly the lower structure) can be prevented. Moreover Since there is no need to move the lower plate in the horizontal direction with respect to the lower structure, it is possible to secure a mounting area for tools and the like on the lower structure. The amount of shear deformation of the rubber bearing body can be made as small as possible, and the lower structure can be optimally designed without requiring an excessively large lower structure, and the cost of the structure can be reduced. It is also possible to maintain and improve the workability related to the installation of the elastic support.

  In addition, according to the method of installing the elastic support for a structure of the present invention, in particular, in order to move the upper plate in the horizontal direction with respect to the upper structure, rainwater and dust are placed between the upper plate and the upper structure. Etc. can be reduced to reduce the possibility of increased sliding frictional resistance between the upper plate and the upper structure, and the upper plate is temporarily fixed and fixed to the lower surface of the upper structure. Since it is arranged directly under the superstructure, the sliding material applied to the upper plate and / or the sliding contact plate to reduce sliding frictional resistance, for example, due to direct sunlight of tetrafluoroethylene resin, etc. For example, when a bolt is used for temporarily fixing the upper plate and the upper structure, the bolt is inserted into and screwed into a bolt hole (hole). Rainwater intrusion, etc. According can reduce the possibility that adhesion may occur, such as corrosion, dust, and Thus, capable of performing movement in the horizontal direction with respect to the superstructure of the temporary fixing of the release and the upper plate of the upper plate easily.

  In addition, according to the method for installing the elastic support for a structure of the present invention, in particular, in order to fix the upper plate to the upper structure, the elastic support does not cause a positional shift with respect to the lower structure, It is possible to eliminate the possibility that an unexpected moment based on such positional deviation and the load on the upper structure is applied to the lower structure.

  Another method of installing an elastic bearing body for a structure according to the present invention includes a rubber bearing body, an upper plate attached to the upper surface of the rubber bearing body, and a lower plate attached to the lower surface of the rubber bearing body. The lower plate is fixed to the lower structure, the upper plate is temporarily fixed to the lower surface of the concrete upper structure, prestress is introduced into the upper structure, and after a certain period of time has passed since the introduction of this prestress, the upper plate The amount of movement to remove the horizontal shear deformation of the rubber bearing based on the amount of elastic shrinkage due to prestress of the upper structure and the amount of creep drying shrinkage after the prestress is introduced The upper plate is moved horizontally with respect to the upper structure, and after this movement, the upper plate is fixed to the lower surface of the upper structure. The same effects as described above can also be achieved by such other methods of installing the elastic support for a structure.

  In a preferred example of the installation method of the elastic bearing body for other structures of the present invention, the horizontal shear deformation of the rubber bearing body based on the amount of elastic shrinkage due to the prestress of the upper structure and the amount of creep drying shrinkage after the prestress is introduced. In addition to the amount of movement to remove, the amount of movement to compensate for the horizontal shear deformation of the rubber base based on the amount of creep drying shrinkage remaining estimated from the amount of creep drying shrinkage after introduction of prestress, The upper plate is moved in the horizontal direction with respect to the upper structure, and after this movement, the upper plate is fixed to the lower surface of the upper structure. According to such a preferred example, in order to move the upper plate in a horizontal direction with respect to the upper structure, particularly with a movement amount to compensate for shear deformation, the actual shrinkage amount of the upper structure has its composition, Even if there are various variations due to temperature or the like, the amount of shear deformation of the rubber support after the final installation can be made as small as possible.

  In a preferable example of the method for installing the elastic support for a structure of the present invention, the upper plate may be moved in the horizontal direction every predetermined period, or the upper plate may be moved in the horizontal direction a plurality of times. According to such a preferable example, a longer horizontal movement is possible without applying excessive stress to the rubber bearing.

  According to the present invention, the amount of shear deformation of the rubber bearing after the final installation can be reduced as much as possible, and the lower structure can be optimally designed without requiring an excessively large lower structure, It is possible to provide a method for installing an elastic support body for a structure which can reduce the cost of the structure and can also maintain and improve workability related to the installation of the elastic support body.

  Next, an example of an embodiment of the present invention will be described in more detail based on an example shown in the figure. The present invention is not limited to these examples.

  1 to 9, an elastic bearing body for a structure (hereinafter referred to as “elastic bearing body”) 1 of this example includes a rubber bearing body 2 and an upper plate 5 attached to the upper surface 3 of the rubber bearing body 2. And a lower plate 6 attached to the lower surface 4 of the rubber bearing body 2.

  A structure 15 such as a bridge on which the elastic support body 1 is installed has an elastic support body 1 interposed between an upper structure 7 such as a concrete bridge girder and a lower structure 9 such as a concrete bridge pier or an abutment. Become.

  A base plate 27 to which the lower plate 6 is fixed by fixing bolts 22 is installed on the upper surface 10 of the lower structure 9. A steel anchor bolt 23 extending in the vertical direction is fixed to the base plate 27. The anchor bolt 23 is fixed to the lower structure 9 by being embedded in the lower structure 9.

  A slidable contact plate 33 slidably joined to the upper plate 5 is installed on the lower surface 8 of the upper structure 7. A steel anchor bolt 34 extending in the vertical direction is fixed to the sliding contact plate 33. The anchor bolt 34 is fixed to the upper structure 7 by being embedded in the upper structure 7, and the sliding contact plate 33 is fixed to the upper structure 7 by the anchor bolt 34. The sliding contact plate 33 is formed with a bolt hole 42 into which the temporarily fixing and fixing bolt 35 is screwed. The bolt holes 42 may be formed in advance, but may be formed when the upper plate 5 is temporarily fixed and fixed. A pair of guide plates 38 that guide the upper plate 5 in the direction in which the upper plate 5 is moved with respect to the upper structure 7 are attached to the sliding contact plate 33. The opposite side surfaces 39 of the pair of guide plates 38 are treated with a tetrafluoroethylene resin or the like, and are in sliding contact with the upper plate 5 on the side surfaces 39.

  The rubber support body 2 is disposed above the rubber elastic body 11, the plurality of thin reinforcing plates 12 embedded in the rubber elastic body 11 in a stacked manner, and the uppermost thin reinforcing plate 12. 11, and an upper thick reinforcing plate 13 embedded in the upper portion 18 of the rubber 11 and a lower thick reinforcing plate 14 disposed below the lowermost thin reinforcing plate 12 and embedded in the lower portion 19 of the rubber elastic body 11. is doing. After the elastic bearing body 1 is installed, the rubber bearing body 2 undergoes shear deformation mainly in the horizontal direction due to relative displacement caused by an earthquake between the upper structure 7 and the lower structure 9.

  The lower plate 6 is attached to the lower thick reinforcing plate 14 with mounting bolts (not shown). A recess is formed in each of the lower plate 6 and the lower thick reinforcing plate 14, and an engagement piece 25 for engaging the lower plate 6 and the rubber support 2 is disposed in the recess. The engaging piece 25 prevents the lower plate 6 from slipping in the horizontal direction with respect to the rubber bearing body 2 by the engagement. The lower plate 6 is fixed to the base plate 27 by fixing bolts 22, but may be welded to the base plate 27.

  The upper plate 5 is attached to the upper thick reinforcing plate 13 by mounting bolts (not shown). A recess is formed in each of the upper plate 5 and the lower thick reinforcing plate 13, and an engaging piece 37 for engaging the upper plate 5 and the rubber support 2 is disposed in the recess. The engaging piece 37 prevents the upper plate 5 from slipping in the horizontal direction with respect to the rubber bearing 2 by the engagement. The upper plate 5 is temporarily fixed and fixed to the lower surface 8 of the upper structure 7 via the sliding contact plate 33 by being temporarily fixed and fixed to the sliding contact plate 33 by the bolts 35 for temporarily fixing and fixing.

  The upper plate 5 is formed with a plurality of bolt holes 41 through which the bolts 35 are inserted. When the horizontal movement of the upper plate 5 with respect to the upper structure 7 is performed a plurality of times for each predetermined period, the plurality of bolt holes 41 are arranged in the moving direction with an interval corresponding to each movement amount. Each is arranged. The plurality of bolt holes 41 may be long holes extending in the moving direction. The bolt holes 41 may be formed in advance, but may be formed when the upper plate 5 is temporarily fixed and fixed.

  The elastic support body 1 supports the upper structure 7 on the lower structure 9, and the relative displacement such as horizontal displacement and inclination generated between the upper structure 7 and the lower structure 9 at the time of an earthquake is caused by shear deformation. Allow.

  Hereinafter, the installation method of the elastic support body 1 of this example is demonstrated in detail. Here, the upper structure 7 shall consist of a concrete bridge girder, and the lower structure 8 shall consist of a concrete pier or an abutment. The upper surface 44 of the upper plate 5 and / or the lower surface 45 of the sliding contact plate 33 are made of tetrafluoroethylene resin, molybdenum or the like so that the sliding frictional resistance between the upper plate 5 and the sliding contact plate 33 is reduced. Processing such as coating and baking may be performed.

  First, as shown in FIG. 1, the lower plate 6 of the elastic bearing body 1 in an almost upright state in which the rubber bearing body 2 is not shear-deformed is fixed to the base plate 27 with bolts 22, whereby the lower plate 6 is fixed to the lower structure. While fixing to the upper surface 10 of the object 9, the upper plate 5 is temporarily fixed to the sliding contact plate 33 with the bolt 35, and thereby the upper plate 5 is temporarily fixed to the lower surface 8 of the upper structure 7. Here, the position of the upper plate 5 with respect to the sliding contact plate 33 when temporarily fixed is determined in consideration of the amount of elastic shrinkage due to the prestress of the upper structure 7 and the amount of creep drying shrinkage after the prestress is introduced. It is decentered in the horizontal direction from the central position of the sliding contact plate 33 attached to the side, here the bridge axis direction X and the direction A in which the upper structure 7 contracts.

  Next, prestress in the bridge axis direction X is introduced into the upper structure 7 and left for a certain period. By introducing the prestress, the rubber bearing 2 is sheared and deformed with respect to the bridge axis direction X as shown in FIG. After the introduction of the prestress, the upper structure 7 is further contracted by creep drying, and the shear deformation amount of the rubber support 2 is also increased by the contraction. The creep dry shrinkage of the superstructure 7 is measured and recorded periodically. The predetermined period is a period set in advance within a period that does not exceed the amount of shear deformation in a range in which the rubber support 2 can safely support the vertical load.

  After a certain period of time has elapsed since the introduction of the prestress, as shown in FIG. 4, the hydraulic jack 48 is attached to the portion on the direction A side of the sliding contact plate 33 with the bolt 53 and the tip of the telescopic rod 54 of the hydraulic jack 48 is attached to the upper plate 5. The hydraulic jack 48 is operated to apply a tensile force in the direction A to the upper plate 5 to remove the shearing force applied to the bolt 35, and then the bolt 35 is removed from the sliding plate 33 and the upper plate 5. Then, the temporary fixing of the upper plate 5 to the sliding contact plate 33 is released. After the temporary fixing is released, the hydraulic jack 48 is removed from the sliding contact plate 33.

  Next, as shown in FIG. 5, a hydraulic jack 49 (the removed hydraulic jack 48 may be used) is attached to a portion of the sliding contact plate 33 on the direction B side to be described later with a bolt 53 and the hydraulic jack 49 is expanded and contracted. The tip of the rod 54 is attached to the upper plate 5, and the operation of the hydraulic jack 49 gives the upper plate 5 a tensile force in the direction B opposite to the direction A, thereby causing the upper plate 5 to move in the direction with respect to the sliding contact plate 33. Move to B. Here, the upper plate 5 is moved to remove the shear deformation in the bridge axis direction X of the rubber support 2 based on the amount of elastic shrinkage due to the prestress of the upper structure 7 and the amount of creep drying shrinkage after the prestress is introduced. In addition to the above, the amount of movement that compensates for the shear deformation in the bridge axis direction X of the rubber bearing body 2 based on the remaining creep drying shrinkage amount estimated from the measured and recorded creep drying shrinkage amount after introduction of prestress as described above. To move in the direction B. As shown in FIG. 6, the elastic bearing body 1 in which the upper plate 5 is moved in the direction B with the amount of movement is sheared and deformed, and the upper plate 5 is in the direction B from the center position of the sliding plate 33. It is arranged at a position eccentric to the side. The positioning of the upper plate 5 to be moved in the direction B with the moving amount is such that the positioning plate 51 detachably attached to the sliding contact plate 33 via the guide plate 38 by the bolt 55 is moved in the direction B. This is done by contacting the plate 5. By using such a positioning plate 51, the upper plate 5 can be easily positioned. The dimension of the positioning plate 51 is appropriately changed according to the movement amount. It should be noted that the remaining creep drying shrinkage can be predicted even better if temperature correction is performed. Further, the amount of movement of the upper plate 5 in the bridge axis direction X may be determined in consideration of the amount of expansion / contraction of the upper structure 7 due to the temperature during movement.

  After the upper plate 5 is moved by the operation of the hydraulic jack 49, the upper plate 5 is temporarily fixed or fixed to the sliding contact plate 33 with bolts 35 as shown in FIG. Thereafter, the hydraulic jack 49 is removed from the sliding contact plate 33 as shown in FIG. A hole-filling bolt 52 is attached to a bolt hole (not shown) for attaching the jack of the sliding contact plate 33 with the hydraulic jacks 48 and 49 removed.

  The movement of the upper plate 5 as described above may be repeated every predetermined period by dividing the total movement amount into a plurality of times. In this case, the total movement amount of the upper plate 5 is the allowable shear of the elastic support 1. The amount of deformation is no longer limited.

  After the final movement of the upper plate 5 with respect to the sliding contact plate 33, the upper plate 5 is fixed to the sliding contact plate 33 by bolts 35 and welding, and the welded portion is supplementarily coated.

  According to the installation method of the elastic bearing body 1 described above, the remaining creep drying shrinkage amount is predicted from the creep drying shrinkage amount after the pre-stress is introduced, and the upper plate 5 is formed on the basis of the predicted residual creep drying shrinkage amount. Since it is moved and finally fixed, the rubber bearing 2 of the elastic bearing body 1 is decentered by a more accurate residual creep drying shrinkage. As a result, when the creep drying shrinkage is almost finished, As shown in FIG. 9, the shear deformation of the rubber support 2 becomes substantially zero, and can exhibit an equivalent performance against vibrations and displacements such as earthquakes. In addition, since the upper structure 7 can be supported in a state where the shear deformation is substantially zero, a more stable support is provided.

  When the structure 15 is a bridge as in this example, the elastic shrinkage and the creep drying shrinkage due to the prestress of the upper structure 7 mainly occur in the bridge axis direction X, and thus are limited in the bridge axis direction X. The upper plate 5 can be moved with respect to the upper structure 7 without any change.

  According to the installation method of the elastic bearing body for a structure of this example, the rubber bearing body 2, the upper plate 5 attached to the upper surface 3 of the rubber bearing body 2, and the lower plate 6 attached to the lower surface 4 of the rubber bearing body 2. The lower plate 6 is fixed to the lower structure 9 and the upper plate 5 is temporarily fixed to the lower surface 8 of the upper structure 7. After a certain period of time has elapsed since the temporary fixing, The upper plate 5 is moved in the horizontal direction with respect to the upper structure 7 with a moving amount for releasing the temporary fixing to the upper structure 7 and removing the shear deformation of the rubber support 2, and after this movement, the upper plate 5 Are fixed to the lower surface 8 of the upper structure 7, more specifically, the rubber support 2, the upper plate 5 attached to the upper surface 3 of the rubber support 2, and the lower surface 4 of the rubber support 2. Elastic bearing body 1 having a lower plate 6 The lower plate 6 is fixed to the lower structure 9, the upper plate 5 is temporarily fixed to the lower surface 8 of the concrete upper structure 7, and prestress is introduced into the upper structure 7. After the elapse of time, the temporary fixing of the upper plate 5 to the upper structure 7 is released, and the horizontal direction of the rubber support 2 based on the amount of elastic shrinkage due to the prestress of the upper structure 7 and the amount of creep drying shrinkage after the prestress is introduced. The upper plate 5 is moved in the horizontal direction with respect to the upper structure 7 with a movement amount for removing the shear deformation of the lower structure, and the lower plate 8 is fixed to the lower surface 8 of the upper structure 7 after this movement. The upper plate 5 can be moved in the horizontal direction without being limited by the dimensions of the object 7, and the elastic bearing body can reduce the shear deformation amount of the rubber bearing body 2 as much as possible when the structure 15 is completed. It is possible to construct a structure 15 capable of exhibiting a desired performance against vibrations such as an earthquake by the elastic bearing body 1, and a rubber bearing having a mechanically required size. The need to select a rubber bearing body larger than the body 2 can be reduced, and the lower structure 9 can be optimally designed without considering the amount of horizontal movement of the lower plate 6 relative to the lower structure 9. In addition, the material cost of the structure 15, particularly the lower structure 9, can be prevented and an area for moving the lower plate 6 in the horizontal direction with respect to the lower structure 9 is not required. Therefore, it is possible to secure a mounting area for the tool or the like on the lower structure 9, and thus the amount of shear deformation of the rubber support 2 after the final installation can be made as small as possible and excessively large. Requires substructure Therefore, the lower structure 9 can be optimally designed, and the structure 15 can be reduced in cost, and the workability related to the installation of the elastic support 1 can be maintained and improved. Also, according to the method of installing the elastic support for a structure of this example, the possibility of rainwater, dust, etc. entering between the upper plate 5 and the upper structure 7 is reduced, and the upper plate 5 and the upper structure 7 The possibility of increasing the sliding frictional resistance of the upper structure 5 can be reduced, and the upper plate 5 is disposed immediately below the upper structure 7 in order to temporarily fix and fix the upper plate 5 to the lower surface 8 of the upper structure 7. In addition, it is possible to prevent early deterioration based on a temperature rise due to direct sunlight of a sliding material, for example, tetrafluoroethylene resin, which is applied to the upper plate 5 and / or the sliding contact plate 33 to reduce sliding frictional resistance. In addition, for example, when a bolt 35 is used for temporarily fixing the upper plate 5 and the upper structure 7, the rainwater is inserted into the bolt hole 41 and the bolt hole 42 into which the bolt 35 is inserted and screwed. Corrosion and dust due to intrusion, etc. It is possible to reduce the possibility that adhesion occurs in and Thus, capable of performing movement in the horizontal direction with respect to the superstructure 7 of the temporary fixing of the release and the upper plate 5 of the upper plate 5 easily. In addition, according to the installation method of the elastic bearing body for a structure of this example, the elastic bearing body 1 is not displaced with respect to the lower structure 9, and the positional displacement and the load of the upper structure 7 are prevented. It is possible to eliminate the possibility of an unexpected moment based on the lower structure 9 being applied.

  According to the installation method of the elastic bearing body for the structure of this example, the horizontal shear deformation of the rubber bearing body 2 based on the amount of elastic shrinkage due to the prestress of the upper structure 7 and the creep drying shrinkage amount after the prestress is introduced. In addition to the amount of movement to remove, the amount of movement to compensate for the horizontal shear deformation of the rubber support 2 based on the amount of creep dry shrinkage remaining from the amount of creep dry shrinkage after introduction of prestress, In order to move the upper plate 5 in the horizontal direction with respect to the upper structure 7 and to fix the upper plate 5 to the lower surface 8 of the upper structure 7 after this movement, the actual contraction amount of the upper structure 7 has its composition, Even if there are various variations due to temperature or the like, the amount of shear deformation of the rubber support 2 after final installation can be made as small as possible.

  In the installation method of the structural elastic support body of this example, the upper plate 5 may be moved in the horizontal direction every predetermined period, or the upper plate 5 may be moved in the horizontal direction a plurality of times. When moving in this way, a longer horizontal movement is possible without applying excessive stress to the rubber support 2.

  As the rubber support 2, a rubber elastic body 11 in which one or a plurality of lead plugs are embedded may be used.

It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention. It is II-II sectional view taken on the line of the elastic support body for structures shown in FIG. It is a top view of the elastic support body for structures shown in FIG. It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention. It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention. It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention. It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention. It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention. It is explanatory drawing regarding the installation method of the elastic support body for structures of the example of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic support body for structures 2 Rubber bearing body 5 Upper plate 6 Lower plate 7 Upper structure 9 Lower structure

Claims (4)

The lower plate of the elastic bearing body having the rubber bearing body, the upper plate attached to the upper surface of the rubber bearing body and the lower plate attached to the lower surface of the rubber bearing body is fixed to the lower structure, and the upper plate is made of concrete. The prestress is introduced into the upper structure by slidably joining the sliding plate installed on the lower surface of the upper structure and temporarily fixed by a bolt for temporary fixing and fixing extending in the vertical direction. After a certain period of time has passed since the introduction of the hydraulic jack, attach the hydraulic jack to the part of the sliding contact plate where the upper structure contracts, attach the tip of the telescopic rod of the hydraulic jack to the upper plate, and operate the attached hydraulic jack The shear force applied to the bolt for temporary fixing and fixing by applying a tensile force in the direction in which the upper structure contracts to the upper plate by After that, the temporary fixing to the upper structure of the upper plate is released by removing the temporary fixing and fixing bolt from the sliding contact plate and the upper plate, and the hydraulic jack is removed from the sliding contact plate and the upper plate. Next, the hydraulic jack is attached to a portion on the direction side opposite to the direction side where the upper structure of the sliding contact plate contracts, and the tip of the telescopic rod of the hydraulic jack is attached to the upper plate, and the attached hydraulic jack A rubber based on the amount of elastic shrinkage due to prestress of the upper structure and the amount of creep drying shrinkage after the introduction of prestress by applying a tensile force in the direction opposite to the direction in which the upper structure shrinks to the upper plate by the operation of The upper plate was installed on the lower surface of the upper structure with the amount of movement to remove the horizontal shear deformation of the support body. The upper plate is moved in the horizontal direction opposite to the direction in which the upper structure contracts with respect to the contact plate, and after this movement, the upper plate is temporarily fixed and fixed to the sliding contact plate installed on the lower surface of the upper structure. To install elastic bearings for structures fixed with bolts . In addition to the amount of movement to remove horizontal shear deformation of the rubber base based on the amount of elastic shrinkage due to prestress of the superstructure and the amount of creep drying shrinkage after the prestress is introduced, creep drying after the introduction of prestress What is the direction in which the upper structure contracts the upper plate with respect to the upper structure with a movement amount to compensate for the horizontal shear deformation of the rubber bearing based on the residual creep drying shrinkage amount predicted from the shrinkage amount? The structure according to claim 1, wherein the upper plate is fixed to a sliding contact plate installed on the lower surface of the upper structure with a bolt for temporarily fixing and fixing, after moving in the opposite direction and in the horizontal direction. Installation method for elastic bearings. The installation method of the elastic support body for structures according to claim 1 or 2 , wherein the upper plate is moved in the horizontal direction every predetermined period . The method for installing an elastic support for a structure according to any one of claims 1 to 3, wherein the upper plate is moved a plurality of times in the horizontal direction .

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