JP5537145B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device used in a bridge or the like, and more particularly, to a bearing device suitable for installation by adopting a removal / deformation method.

  In general, in the construction of a support body that supports a bridge, when the superstructure (bridge girder) is an integrally manufactured bridge girder such as steel, the bridge girder is loaded at the stage where the entire load of the bridge girder is borne by the support body. In consideration of the downward bending that occurs in the case, the bridge girder is intentionally bent in the direction (upward) opposite to the direction of bending when the load is supported.

  In the above case, when using a rubber bearing or the like that is easily deformed in the horizontal direction, when the bridge girder is placed on the rubber bearing body, the above-mentioned intentional deflection is removed by the load of the bridge girder itself, A phenomenon occurs in which the installation interval of the rubber bearings in the bridge axis direction increases. As a result, a shift in the bridge axis direction occurs between the mounting position on the upper work side and the mounting position on the lower work side of the rubber bearing body, and the rubber bearing body is mounted in an inclined state. In such a case, the construction manager temporarily takes the load of the bridge girder temporarily with a vertical jack or the like, removes the bending of the bridge girder, and then devise to move the load of the bridge girder to the rubber support.

  In addition, when the upper structure (bridge girder) is structured to cast concrete at the construction site, especially when it is a so-called prestressed concrete bridge in which the bridge girder is composed of prestressed concrete, the PC steel material will shrink. Since the compressive force is applied to the concrete using the force described above, when the PC steel material shrinks, the upper work side of the rubber support moves along the bridge axis direction by the amount of the shrinkage. Also in this case, a deviation in the bridge axis direction occurs between the mounting position on the upper work side and the mounting position on the lower work side of the rubber bearing body, and the posture (shear deformation) of the rubber bearing body is inclined.

  Furthermore, since the shear deformation of the rubber bearing body is caused by the influence of temperature change, drying shrinkage of concrete, and creep, it is necessary to sufficiently consider them when constructing the bearing body.

  For example, as described in Non-Patent Document 1, the rubber bearing body is installed in a state where the rubber bearing body is inclined to the opposite side by an amount corresponding to the expected inclination amount of the rubber bearing body. Pre-deformation method that changes the rubber bearing body to an upright state when the object is deformed and construction without tilting the rubber bearing body, and then the rubber bearing body is placed on the opposite side by the amount of inclination caused by the deformation of the superstructure. There is a removal / deformation method in which the posture is corrected by deforming it to the right.

  Of the above, the pre-deformation method uses a shear deformation holding jig, constructs the bridge girder in a state where the expected amount of deformation is applied to the rubber support in advance, and then removes the shear deformation holding jig, The posture of the rubber bearing is made upright. In this pre-deformation method, the rubber bearing body is tilted in a state where no vertical load is loaded, so that a force in the rotational direction acts on the rubber bearing body, and the upper and lower surfaces of the rubber bearing body cannot be maintained parallel. There is a fear. In such a case, contrivances such as sandwiching a level adjusting plate in a shear deformation holding jig are performed.

  On the other hand, with the removal deformation method, installation of the superstructure and substructure is performed in an upright state without tilting the rubber bearing body, and the bridge girder load is loaded on the rubber bearing body at an appropriate time thereafter. The lower mounting plate of the rubber support is slid on the base plate, the installation position is adjusted, and the posture of the rubber support is restored to the upright state. At this time, since the friction coefficient of the sliding surface that slides is preferably lower, both the lower mounting plate and the base plate sliding surface are hot dip galvanized rust-proofing, metal spray rust-proofing, paint rust-proofing, etc. Instead of the antirust treatment layer, a sliding lubricating film is formed.

  In the removal deformation method, when returning the rubber bearing body to the upright state, first, the rubber bearing body inclined due to the deformation of the upper structure is temporarily received in the horizontal direction by the hydraulic jack, and then the lower mounting plate is mounted. Remove the mounting bolts that secure the base plate. Then, the lower mounting plate is slid on the base plate with a hydraulic jack, and the installation positions of the upper work and the lower work are adjusted so that the rubber support is in an upright state when the bridge is completed. In this state, the lower mounting plate is fixed to the base plate by mounting bolts or welding.

  Thereafter, in a state where the installation is completed, a portion exposed by sliding (a portion of the surface on which the sliding lubricant film is formed, which is exposed after sliding) is subjected to rust prevention treatment. This rust prevention treatment is carried out by removing the sliding lubricant film from the exposed portion, adjusting the roughness of the surface from which the film has been removed, applying a base treatment, and applying a treatment such as coating on the base.

  Further, in Patent Document 1, as one of the above-described removal deformation methods, it is assumed that the deformation amount caused by the prestress and the deformation amount caused by the drying shrinkage of the concrete are not only slid but also occur thereafter. A technique has been disclosed in which the rubber support is further tilted to the opposite side in consideration of the amount of shrinkage of the concrete to greatly shorten the time required for construction.

Japanese Patent No. 2757728

Japan Road Association, “Handbook of Road Bridge Support (revised version)”, pages 243-245

  However, in the conventional construction method using the removal deformation method, the rust prevention treatment of the exposed portion after sliding the lower mounting plate must be performed on the abutment at the bridge construction site after sliding the lower mounting plate. In other words, it is subject to various restrictions as compared with the case where rust prevention treatment is performed indoors in a factory or the like. For this reason, for example, when rust prevention treatment is performed by painting, it is difficult to ensure the same rust prevention power as other parts even if the ground treatment and coating film management are sufficiently performed. There's a problem.

  In addition, there is a method of forming a metal spray rust preventive layer instead of coating to prevent rust treatment, but since the thermal spray equipment required for metal spray work is relatively large, There are many problems in terms of loading of the apparatus, installation location of the apparatus, power supply to the apparatus, and the distance between the spray gun and the rust-proof surface during the spraying operation. In this case, the operation cost is likely to increase, and it is difficult to say that it is practical.

  Furthermore, there is a method of ensuring rust prevention power by forming a hot dip galvanized rust preventive film, but it is difficult to perform rust prevention work on the abutment of the bridge construction site in the construction process.

  In addition, considering the downward bending due to the load of the bridge girder itself that occurs at the construction stage of the steel bridge, the rubber bearing in the bridge axis direction is removed by removing the intentional bending in the direction opposite to the bending direction previously given to the bridge girder itself. In order to return the rubber bearing body to the upright state in response to the phenomenon that the installation interval of the body is widened, as described above, the load of the bridge girder is temporarily received with a vertical jack and the process of removing the bending of the bridge girder is interposed. Therefore, it is necessary to secure the location of the vertical jack on the abutment and to examine the load resistance of the vertical jack positions in the upper and lower structures.

  On the other hand, when applying the gradual deformation method used when the bridge girder is made of concrete with respect to the steel bridge without using the temporary jack, securing the location of the vertical jack on the abutment, Although it becomes unnecessary to examine the load resistance of the vertical jack position in the upper and lower structures, the problem of the rust prevention treatment of the portion exposed after sliding of the lower mounting plate similarly occurs.

  Furthermore, since the steel girders are designed and manufactured based on the reference temperature, the length of the girders will be longer at the reference temperature if the temporary construction is in the summer, and conversely if the temporary construction is in the winter. For example, a phenomenon occurs in which the length of the girder is shortened at the reference temperature, and it may be necessary to move the support position in the bridge axis direction after installation at the bridge shaft end of the girder.

  When this problem is solved by using the removal deformation method used when the bridge girder is made of the concrete, a countermeasure for the rust prevention treatment of the portion exposed after sliding of the lower mounting plate is similarly required. And since the expansion / contraction amount of the steel bridge girder is obtained from the linear expansion coefficient, the length of the steel girder, and the temperature change from the reference temperature, it has been a big problem particularly in the case of a continuous bridge between long diameters.

  Therefore, the present invention has been made in view of the above-described problems, and it is possible to improve workability and reduce work costs during installation while providing an appropriate rust prevention force to the support device. An object is to provide a bearing device.

In order to achieve the above object, the present invention provides a support body having an upper mounting plate connected to the upper surface side and a lower mounting plate connected to the lower surface side, and installed between the upper mounting plate and the upper structure. And a base plate installed between the lower mounting plate and the lower structure, while supporting the load of the upper structure, the lower mounting plate is horizontally disposed between the base plate and the base plate. A mounting device for adjusting the mounting position of the support body by sliding on the bottom mounting plate and the sliding surface side of the base plate, the metal spray rust prevention from the plate body toward the sliding surface A layer and a lubricating layer having the metal-sprayed rust-preventing layer as a base are sequentially laminated.

According to the present invention, on each sliding surface side of the lower mounting plate and the base plate, the metal spray rust prevention layer and the lubrication layer based on the metal spray rust prevention layer are provided from the plate body toward the sliding surface. Since the layers are sequentially laminated, the lubricity layer can ensure the lubricity between the lower mounting plate and the base plate while the rust prevention of the lower mounting plate and the base plate is achieved by the metal spray rust-proofing layer. In addition, when the lower mounting plate slides on the base plate, the lubrication layer also functions as a protective layer that protects the metal sprayed rust-preventing layer. Can do. Accordingly, it is possible to eliminate the need for the rust prevention treatment after the sliding operation, and it is possible to improve the workability and reduce the work cost when installing the support device.

Further, the present invention provides a support body having an upper mounting plate coupled to the upper surface side and a lower mounting plate coupled to the lower surface side, and a sole plate installed between the upper mounting plate and the upper structure. A base plate installed between the lower mounting plate and the lower structure, and horizontally sliding the upper mounting plate with the sole plate while supporting a load of the upper structure. wherein a bearing device for adjusting the mounting position of the scaffold, the sliding surface side of each of said upper mounting plate and said sole plate, metal spraying anticorrosive layer toward the plate body sliding surface and the Te A lubricating layer having a metal spray rust-preventing layer as a base is sequentially laminated. According to the present invention, as in the case of the above-described invention, it is possible to improve workability and reduce the work cost when installing the support device while providing an appropriate rust prevention force to the support device.

  In the bearing apparatus, the metal spray rust prevention layer is at least selected from the group consisting of zinc, aluminum, zinc-aluminum alloy or pseudo alloy, aluminum-magnesium alloy or pseudo alloy, and zinc-aluminum-magnesium alloy or pseudo alloy. One kind can be formed by thermal spraying.

  According to this, compared with the case where the hot dip galvanizing method is used, the number of processes can be greatly reduced, and it becomes possible to shorten the manufacturing period and the manufacturing cost of the base plate and the like. Further, since it is possible to avoid warping of the steel material in the middle of the operation, it is preferable for ensuring the flatness of the sliding surface, and it is possible to provide a stable base plate and the like in terms of quality. Furthermore, since the metal spray rust prevention layer can be formed without deteriorating the quality within the range that the spray gun can reach, there is an advantage that it is not affected by the size of the steel material to be subjected to the rust prevention treatment.

  In the above bearing device, the lubricating layer is applied to a rust preventive lubricant baked film containing molybdenum disulfide, and the sliding surface side surface of the rust preventive lubricant baked film, and includes a fluororesin, molybdenum disulfide, and graphite. A coating layer containing at least one of them, and the surface of the coating layer can constitute the sliding surface. According to this, since the difference between the coefficient of static friction and the coefficient of dynamic friction can be reduced and a low coefficient of friction can be obtained, the sliding between the lower mounting plate and the base plate can be achieved even when the load of the upper structure is supported. Alternatively, sliding between the upper mounting plate and the sole plate can be performed with a small force. If the friction coefficient is 0.1 or less, a small jack can be used as the jack used for the sliding operation.

  In the above-described support device, the metal spray rust-proof layer has a thickness of 100 μm or more, a surface roughness (maximum height Ry) of 30 μm or less, and the rust-preventive lubricant-baked film has a thickness of 15 μm or more. It can be configured to have a thickness. According to this, while ensuring the low friction coefficient at the time of sliding and maintaining the lubricating layer in a sliding surface, it can suppress that an individual difference arises in them. Moreover, the antirust power of the sliding surface after a sliding operation can be maintained over a long period of time.

  In the above bearing device, the lubricating layer includes a sheet layer that is covered on the sliding surface side surface of the metal sprayed rust preventive layer and includes at least one of fluororesin, polyethylene resin, polyester resin, and graphite. The surface of the sheet layer can constitute the sliding surface. According to this, the baking process at the time of forming a rust preventive lubricant baking film can be omitted, and it becomes possible to shorten the manufacturing period and reduce the manufacturing cost.

  In the support apparatus, the metal spray rust-proof layer has a thickness of 100 μm or more, a surface roughness (maximum height Ry) of 30 μm or less, and the sheet layer has a thickness of 0.2 mm or more. It can be configured to have a thickness of 0 mm or less. According to this, it is possible to keep the surface shape of the sliding surface flat and perform the sliding operation with a low frictional force.

  In the above-described support device, the lubricating layer may be a coating layer made of a dry film lubricant containing at least one of molybdenum disulfide, graphite, and fluororesin, and the surface of the coating layer may constitute the sliding surface. it can.

  In the above-mentioned support device, the metal spray rust-proof layer has a thickness of 100 μm or more, and can have a surface roughness (maximum height Ry) of 30 μm or less. A sliding operation can be performed.

  In the above bearing device, the bearing body may be a laminated rubber body in which rigid material layers and elastic material layers are alternately laminated, and the laminated rubber body is a laminated rubber body with a lead plug into which columnar lead is inserted; can do.

  As described above, according to the present invention, it is possible to improve workability and reduce work costs when installing the support device while providing an appropriate rust prevention force to the support device.

It is sectional drawing which shows 1st Embodiment of the support apparatus concerning this invention. It is the A section enlarged view of FIG. It is a figure which shows the installation process of the support apparatus of FIG. It is a figure which shows the installation process of the support apparatus of FIG. It is a figure which shows the installation process of the support apparatus of FIG. It is a figure which shows the installation process of the support apparatus of FIG. It is a figure which shows the installation process of the support apparatus of FIG. It is a figure which shows the installation process of the support apparatus of FIG. It is a figure which shows the case where the support apparatus of FIG. 1 is applied to construction of a steel bridge. It is sectional drawing which shows 2nd Embodiment of the support apparatus concerning this invention. It is sectional drawing which shows 3rd Embodiment of the support apparatus concerning this invention. It is a figure which shows the log | history curve of Example 1. FIG. It is a figure which shows the log | history curve of Example 2. FIG. It is a figure which shows the friction coefficient of Example 1,2. It is a figure which shows the friction coefficient of Examples 3-1 to 3-3.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a first embodiment of a bearing device according to the present invention. The bearing device 1 includes a laminated rubber body 2, a sole plate 3 provided above the laminated rubber body 2, and And a base plate 4 provided below the laminated rubber body 2.

  The laminated rubber body 2 is provided to support the structure and the like in a stable state, to soften horizontal vibration in an earthquake and the like, and to make the structure shake longer. The laminated rubber body 2 has an elastic material layer 2b made of rubber and a rigid material layer 2c made of an iron plate alternately laminated in the vertical direction, and is configured in a rectangular shape, a rectangular shape or a circular shape in plan view. An upper reinforcing plate 2d is embedded in the uppermost portion of the laminated rubber body 2, and the upper reinforcing plate 2d is connected to an upper mounting plate 6 installed on the upper surface side of the laminated rubber body 2 via a hexagon bolt 5a. . On the other hand, a lower reinforcing plate 2e is embedded in the lowermost part of the laminated rubber body 2, and the lower reinforcing plate 2e is connected to a lower mounting plate 7 installed on the lower surface side of the laminated rubber body 2 via a hexagon bolt 5b. Is done.

  The sole plate 3 is installed between an upper concrete structure (hereinafter referred to as “upper structure”) 8 such as a bridge girder and an upper mounting plate 6 and is provided for connecting the laminated rubber body 2 to the upper structure 8. . The upper surface 3a of the sole plate 3 is fixed to the upper structure 8 by the upper anchor bolt 9, while the lower surface 3b is connected to the upper mounting plate 6 through the upper mounting bolt 10 and the mounting hole 3c.

  The base plate 4 is installed between the lower structure 11 such as a bridge pier and the lower mounting plate 7 and is provided for connecting the laminated rubber body 2 to the lower structure 11. The lower surface 4 a of the base plate 4 is fixed to the lower structure 11 by lower anchor bolts 12, while the upper surface 4 b is connected to the lower mounting plate 7 by lower mounting bolts 13. The base plate 4 is provided with two types of mounting holes, a main mounting hole 4c and a temporary mounting hole 4d. The base plate 4 and the lower mounting plate 7 are connected to either the main mounting hole 4c or the temporary mounting hole 4d. This is done by screwing the lower mounting bolt 13 into the screw.

  Further, on the upper surface 4b side of the base plate 4, as shown in FIG. 2, there are a metal spray rust preventive layer 42, a rust preventive lubricant baked film 43 and a coat layer 44 from the plate body 41 of the base plate 4 toward the upper surface 4b. Laminated sequentially. Further, on the lower surface 7 a side of the lower mounting plate 7, a metal sprayed antirust layer 72, an anticorrosive lubricant baking film 73, and a coat layer 74 are sequentially laminated from the plate body 71 of the lower mounting plate 7 toward the lower surface 7 a. The

  The metal spray rust-proof layers 42 and 72 are intended to serve as a base for the rust-preventive lubricant baking films 43 and 73 as well as to prevent rusting of the base plate 4 and the like. The metal spray rust-proof layers 42 and 72 are made of at least one selected from the group consisting of zinc, aluminum, zinc-aluminum alloy or pseudo alloy, aluminum-magnesium alloy or pseudo alloy, and zinc-aluminum-magnesium alloy or pseudo alloy. It is formed by thermal spraying.

  Here, “pseudoalloy” means an alloy in which two or more kinds of metal materials are not completely compatible with each other. Specifically, each metal material is applied to the same surface using different spray guns. This refers to thermal spraying on the surface and progressing alloying to some extent in the area where the metal material is adhered.

  The rust preventive lubricant baked coatings 43 and 73 are provided to reduce the friction coefficient between the base plate 4 and the lower mounting plate 7 while preventing the base plate 4 and the like together with the metal spray rust preventive layers 42 and 72. The rust preventive lubricant baked films 43 and 73 are formed by spraying and baking a rust preventive lubricant solution containing molybdenum disulfide as a main component on the surface of the metal spray rust preventive layers 42 and 72.

  The coat layers 44 and 74 reduce the friction coefficient between the base plate 4 and the lower mounting plate 7, in particular, the difference between the static friction coefficient and the dynamic friction coefficient, and reduce damage to the rust preventive lubricant baking films 43 and 73. Provided. The coat layers 44 and 74 are formed by applying a coating liquid containing at least one of fluororesin, molybdenum disulfide, and graphite on the surface of the rust preventive lubricant baking films 43 and 73. The coating liquid may be applied by spraying or by brush.

  And the specific manufacturing process of the metal spraying rust prevention layers 42 and 72, the antirust lubricant baking films 43 and 73, and the coating layers 44 and 74 is as follows. It should be noted that the same procedure is used when forming the metal spray rust prevention layer or the like on either the base plate 4 or the lower mounting plate 7, and here, the case of forming on the base plate 4 is exemplified. . Moreover, the metal spraying rust prevention layer 42 shall be formed from an aluminum-magnesium alloy material, and the plasma spraying method shall be used for the spraying method.

(1) Base plate steel substrate adjustment (blasting)
(2) Plasma spray treatment of aluminum-magnesium alloy material (formation of metal spray rust prevention layer)
(3) Planar processing of plasma sprayed surface (buffing treatment)
(4) Spraying of a rust preventive lubricant solution containing molybdenum disulfide (5) Firing and baking (6) Cooling (7) Spray coating of coating liquid containing fluororesin

  At the time of forming the metal spray rust prevention layer 42, the thickness of the metal spray rust prevention layer 42 is preferably 100 μm or more. Further, in the planar processing of the plasma sprayed surface, the surface roughness (maximum height Ry) is preferably 30 μm or less.

Here, for comparison with the above manufacturing process, a manufacturing process of the base plate 4 using a general rust prevention ground treatment by hot dip galvanizing will be given.
(1) Applying masking agent to the area where the lower mounting plate 7 slides on the surface of the base plate steel (2) Adjusting the base material other than the sliding area (masking area) (degreasing → water washing → pickling → water washing → Flux treatment → drying)
(3) Rust prevention treatment (immersion in plating tank)
(4) Cooling (5) Removal of masking agent in sliding area (6) Base adjustment of sliding area (Degreasing → Washing → Phosphate film treatment → Washing → Drying)
(7) Spraying a rust preventive lubricant solution containing molybdenum disulfide onto the sliding area (8) Firing and baking (9) Cooling (10) Correcting warpage of the base plate steel material (11) Spraying coating liquid containing fluororesin Coating

  As can be seen from the above, in the manufacturing process according to the present embodiment, the number of processes can be greatly reduced as compared with the case of using the hot dip galvanizing method, and large-scale equipment such as a plating tank is unnecessary. Become.

  In particular, when a rust-preventive surface treatment is performed using hot dip galvanizing, heat exceeding at least the melting temperature of zinc (430 ° C.) is applied to the base plate steel during the plating treatment. Therefore, warping occurs in the base plate steel material, and it is necessary to correct the warpage of the base plate steel material afterwards. However, since such work requires skilled skills, the number of workers who can work is limited to a specific person, and the labor required for the work is large, leading to various costs such as an increase in cost and a delay in delivery time. It is easy to cause a problem. In addition, cracks and cracks may enter the galvanized surface that has been rust-prevented during the correction work, which not only requires time and cost for the subsequent collection work but also may adversely affect quality.

  On the other hand, in the manufacturing process according to the present embodiment, since the rust prevention layer is formed by the thermal spraying operation, no high heat is given to the base plate steel material, so that the base plate steel material is not warped during the manufacturing operation. . For this reason, it is preferable to ensure the flatness of the sliding surface, and it is possible to provide the base plate 4 that is stable in terms of quality. Moreover, since it can form the metal spraying rust prevention layer 42, without reducing quality, if it is the range which a spray gun reaches, there also exists an advantage that it is not influenced by the magnitude | size of the steel material used as the object of a rust prevention process.

  In addition to the plasma spraying, other thermal spraying methods such as gas spraying and arc spraying can be used as the thermal spraying method for the metal spray rust-proof layer. There is no particular limitation as long as the thermal spray coating can be formed by appropriately combining these thermal spray metal materials. In other words, any thermal spraying method can be used as long as it can avoid warpage of the steel material caused by hot dip galvanizing treatment or the like, and unevenness of the surface seen in hot dip galvanizing treatment, and a predetermined adhesion can be obtained with the steel material. It may be.

  Next, a method for installing the support device 1 shown in FIG. 1 will be described with reference to FIGS. Here, a case where the support device 1 is used for a bridge will be described as an example.

  First, as shown in FIG. 3, the sole plate 3 is fixed to the upper surface of the upper mounting plate 6 through the upper mounting bolt 10, and the base plate 4 is fixed to the lower surface of the lower mounting plate 7 through the lower mounting bolt 13. The support device 1 is installed between the lower surface of the upper structure (bridge girder) 8 and the upper surface of the lower structure (bridge pier) 11. At this time, the lower mounting plate 7 and the base plate 4 are fixed by screwing the lower mounting bolts 13 into the temporary mounting holes 4d, whereby the base plate 4 is located at the center of the upper structure 8 (from the sole plate 3). The bearing device 1 is installed in a state of being located on the side in the center of the bridge axis direction.

  After placing the lower structure 11 and the upper structure 8, as shown in FIG. 4, the upper structure 8 is moved in the center direction by prestressing work, concrete creep and drying shrinkage after a certain period of time. Accordingly, the sole plate 3 moves toward the center of the upper structure 8, and the laminated rubber body 2 is inclined. The sole plate 3 moves toward the center of the upper structure 8 when the bridge is installed. In general, in addition to the bridge girder drying and shrinking toward the center, the compressive force is directed toward the center of the bridge girder. This is because prestressing is performed so as to work.

  After a further period, when the deformation of the upper structure 8 has settled (generally, shrinkage due to prestressing work, concrete creep, and drying shrinkage are almost finished), the load on the upper structure 8 The lower mounting plate 7 is slid on the base plate 4 while supporting the position, the installation position is adjusted, and the posture of the laminated rubber body 2 is corrected to the upright state.

  In such work, first, as shown in FIG. 5, the horizontal force generated by the inclination of the laminated rubber body 2 acts on the lower mounting bolt 13 that fixes the lower mounting plate 7 and the base plate 4. Using the jack 15, the lower mounting plate 7 is pulled in the direction opposite to the center of the upper structure 8 to remove the horizontal force acting on the lower mounting bolt 13. Thereafter, as shown in FIG. 6, the lower mounting bolt 13 is removed, and the fixing between the lower mounting plate 7 and the base plate 4 is released.

  Next, as shown in FIG. 7, the jack 15 is moved to the opposite side of FIG. 5, and then the lower mounting plate 7 is pulled toward the center of the upper structure 8, and the lower mounting plate 7 is moved on the base plate 4. Slide. At this time, the position of the lower mounting plate 7 is moved to the center side of the upper structure 8 by the same amount as the sole plate 3 has moved to the center side of the upper structure 8. Thereby, the deformation | transformation to the center direction of the upper structure 8 by prestress work, concrete creep, and drying shrinkage is absorbed, and the attitude | position of the lamination | stacking rubber body 2 is correct | amended to the state close to an upright.

  As described above, the lower mounting plate 7 and the base plate 4 are formed with the anticorrosive lubricant baked coatings 43 and 73 and the coat layers 44 and 74 as the lubricating layer (see FIG. 2). Even if it is not, the lower mounting plate 7 can be slid on the base plate 4, and it becomes possible to work using a small jack. In addition, damage to the metal spray rust prevention layers 42 and 72 during the sliding operation is preferably prevented by the rust preventive lubricant baking films 43 and 73 and the coating layers 44 and 74. Even if it is not performed, the rust prevention power can be maintained.

  Finally, as shown in FIG. 8, the lower mounting bolt 13 is screwed into the main mounting hole 4 c of the base plate 4, and the lower mounting plate 7 and the base plate 4 are fixed with the laminated rubber body 2 standing upright. As can be understood from the above-described steps, the main mounting hole 4c of the base plate 4 is temporarily mounted by the amount of the movement after allowing for the amount of deformation of the upper structure 8 (the amount of movement of the sole plate 3) in advance. It is provided at a position separated from the hole 4d.

  As described above, according to the present embodiment, the metal sprayed rust preventive layers 42 and 72, the rust preventive lubricant baked coatings 43 and 73, and the coat layer are formed on the sliding surfaces of the lower mounting plate 7 and the base plate 4, respectively. 44 and 74, the rust preventive lubricant baked coatings 43 and 73 and the metal mounting rust preventive layers 42 and 72 and the rust preventive lubricant baked coatings 43 and 73 are used to prevent the lower mounting plate 7 and the base plate 4 from being rusted. The coat layers 44 and 74 can ensure lubricity between the lower mounting plate 7 and the base plate 4.

  Further, when the lower mounting plate 7 slides on the base plate 4, the coat layers 44 and 74 function as a protective layer for protecting the anticorrosive lubricant baking films 43 and 73, and at the same time, the anticorrosive lubricant baking film. Since 43 and 73 function as a protective layer for protecting the metal-sprayed rust-proof layers 42 and 72, it is possible to prevent the rust-proof power from being impaired by the sliding operation. Accordingly, it is possible to eliminate the need for rust prevention treatment after the sliding operation, and it is possible to improve workability and reduce work costs when installing the support device 1.

  In particular, when the support device 1 according to the present embodiment is used for bridge installation, the rust prevention work after the sliding work on the abutment at the bridge construction site becomes unnecessary, so that the efficiency of the site work is improved. The construction period can be shortened. Further, as described above, since it is not necessary to repair the metal spray rust prevention layers 42 and 72 after the sliding operation, the cost required for the repairing operation is not increased, and the repairing cost can be reduced.

  In the above embodiment, the coating layers 44 and 74 are provided on the anticorrosive lubricant baking films 43 and 73 to form a two-layer lubricating layer. However, the coating layers 44 and 74 may be omitted. it can.

  In the above embodiment, the lower mounting plate 7 is slid on the upper surface of the base plate 4. However, the main mounting hole and the temporary mounting hole are formed in the sole plate 3, and the upper mounting plate 6 is the sole plate. It can also comprise so that the lower surface of the plate 3 may slide. In this case, as in the case of the sole plate 3 in FIG. 1, only a kind of mounting hole is formed in the base plate 4, and the lower mounting plate 7 is connected to the base plate 4 so as not to slide on the base plate 4. .

  Furthermore, in the said embodiment, although the structure which has only the elastic material layer 2b and the rigid material layer 2c which were laminated | stacked alternately as the laminated rubber body 2 was illustrated (refer FIG. 1), the center of the laminated rubber body 2 is shown. A laminated rubber body containing a lead plug into which columnar lead is inserted can also be used. In this case, although the columnar lead acts as a resistance force during the sliding operation, the horizontal movement speed when sliding is generally a gentle speed because of working with a hydraulic jack. There is no great resistance due to the creep properties. For this reason, the sliding operation can be performed without much difference from the laminated rubber body 2 into which the columnar lead is not inserted.

  Moreover, in the said embodiment, when adjusting the installation position by sliding the lower attachment board 7 and correct | amending the attitude | position of the laminated rubber body 2 to an upright state (refer FIGS. 5-7), the upper structure 8 The work was started at the stage when the deformation was settled, but it took a considerable period of time to complete the creep and drying shrinkage of the concrete, which is one of the factors leading to a prolonged construction period. For this reason, in the field construction, when it is necessary to carry out the sliding operation and the permanent fixing of the support device 1 at the stage where the remaining deformation amount is assumed, the technique described in Japanese Patent No. 27575728 is applied, and lamination is performed. After returning the posture of the rubber body 2 to the upright state, the lower mounting plate 7 may be further slid to incline the laminated rubber body 2 to the opposite side by an amount corresponding to the assumed remaining deformation amount. .

  Furthermore, in the said embodiment, although the case where it applied to construction of a concrete bridge girder was demonstrated, the support apparatus 1 concerning this Embodiment is effective also to construction of a steel bridge. Hereinafter, the case where the support apparatus 1 is applied to the construction of the steel bridge will be described.

  When manufacturing the steel bridge girder 21, as shown in FIG. 9 (a), a deflection f caused by its own weight at the time of construction is predicted, and a warp in the opposite direction, usually called a camber, is provided. Is taken.

  In this way, in order to preliminarily provide the steel beam 21 in the direction (upward) opposite to the direction in which it is bent by its own weight (upward), the installation of the bridge beam (upper structure) 21 as shown in FIG. When the bending f due to the camber disappears later, the interval W between the fulcrums that support the bridge girder 21 increases. As a result, horizontal shear deformation occurs in the supporting devices 1a and 1b located between the bridge girder 21 and the piers 22 and 23, and the laminated rubber body 2 (see FIG. 1) of the supporting devices 1a and 1b is generated as in the case shown in FIG. Will be inclined).

  Therefore, it is necessary to slide the lower mounting plate 7 or the upper mounting plate 6 (see FIG. 1) of the supporting devices 1a and 1b in the direction opposite to the inclined direction to return the supporting devices 1a and 1b to the upright state. If it is the support apparatus 1 concerning this form, it will become possible to aim at the improvement of workability | operativity in installation, and reduction of work cost, providing appropriate rust prevention power as mentioned above. The specific procedure for returning the support devices 1a and 1b to the upright state is the same as that shown in FIGS.

  Next, a second embodiment of the support device according to the present invention will be described. In addition, since the support apparatus concerning this Embodiment has the structure similar to the support apparatus 1 concerning 1st Embodiment except the upper surface side structure of the baseplate 4, and the lower surface side structure of the lower attachment plate 7, it is here. The difference will be mainly described.

  As shown in FIG. 10, the support device according to the present embodiment includes a sheet layer 45 including at least one of fluororesin, polyethylene resin, polyester resin, and graphite on the upper surface 4 b side of the base plate 4. This sheet layer 45 is provided in place of the rust preventive lubricant baking film 43 and the coat layer 44 of FIG. 2, and functions as a lubricating layer. Further, on the lower surface 7 a side of the lower mounting plate 7, a sheet layer 75 having the same configuration as the sheet layer 45 of the base plate 4 is provided instead of the rust preventive lubricant baking film 73 and the coat layer 74 of FIG. 2.

  Since these sheet layers 45 and 75 can be formed on the surface of the metal sprayed rust preventive layers 42 and 72, the forming process (baking process etc.) of the rust preventive lubricant baking films 43 and 73 (see FIG. 2) is omitted. This makes it possible to shorten the manufacturing period of the support device and reduce the manufacturing cost.

  In forming the sheet layers 45 and 75, the thickness of the metal spray rust prevention layers 42 and 72 is set to 100 μm or more, and the surface roughness (Ry) of the metal spray rust prevention layers 42 and 72 is set to 30 μm or less. It is preferable to adjust the layer thickness of the sheet layers 45 and 75 to 0.2 to 1.0 mm. As a result, the surface shape of the sliding surface can be kept flat, and the sliding operation can be performed with a low frictional force.

  Also in the present embodiment, the metal spray rust prevention layers 42 and 72 and the sheet layers 45 and 75 are provided on the sliding surface side of the lower mounting plate 7 and the sliding surface side of the base plate 4, respectively, thereby preventing rust. Therefore, it is possible to obtain the same effect as that of the first embodiment.

  Next, a third embodiment of the bearing device according to the present invention will be described. Note that the support device according to the present embodiment also has the same configuration as that of the support device 1 according to the first embodiment except for the upper surface side structure of the base plate 4 and the lower surface side structure of the lower mounting plate 7. The explanation will focus on the points.

  As shown in FIG. 11, the support device according to the present embodiment includes a coat layer 46 made of a dry film lubricant containing at least one of fluororesin, molybdenum disulfide, and graphite on the upper surface 4 b side of the base plate 4. . The coat layer 46 by this dry film lubricant is provided in place of the rust preventive lubricant baking film 43 and the coat layer 44 of FIG. 2 and functions as a lubricant layer. Also, on the lower surface 7 a side of the lower mounting plate 7, a coat layer 76 having the same configuration as the coat layer 46 of the base plate 4 is provided instead of the rust preventive lubricant baking film 73 and the coat layer 74 of FIG. 2.

  These coat layers 46 and 76 can be formed by applying a dry film lubricant containing at least one of fluororesin, molybdenum disulfide, and graphite on the surface of the metal spray rust preventive layers 42 and 72. For example, it can be formed by spraying a solid lubricant-containing spray such as Sumilon 2250 spray, Mori Dry spray 5510, Graphite spray G (all trade names) manufactured by Sumiko Lubricant Co., Ltd.

  In addition, when using a paint containing a molybdenum disulfide lubricant that cures at room temperature as a dry film lubricant, baking is not required, so the baking process can be omitted, resulting in shorter delivery times and lower costs. You can plan. Further, in this case, it is possible to preferably cope with aging deterioration and peeling of the coat layer 46 at the construction site.

  Further, when forming the coat layers 46 and 76, the metal sprayed rust preventive layers 42 and 72 are made to have a thickness of 100 μm or more in order to enable a sliding operation with a low frictional force, and the metal sprayed rust preventive layer 42 is formed. 72, the surface roughness (Ry) of 30 μm or less is preferably applied with a dry film lubricant.

  Also in the present embodiment, since both the rust preventive action and the lubricating action can be ensured by the metal spray rust preventive layers 42 and 72 and the coat layers 46 and 76, the same action as the first and second embodiments. An effect can be obtained.

  Further, in the configuration in which the coating layers 46 and 76 made of the dry coating lubricant are directly provided on the metal spray rust prevention layers 42 and 72, a long-term bridge construction is performed on the air exposed surface of the coating layers 46 and 76 applied at the time of assembling the support. Even if damage such as peeling due to aging or the like occurs during the period, it can be easily repaired by applying a dry coating lubricant on the metal spray rust-proof layers 46 and 76 again at the time of sliding operation.

  Furthermore, in the manufacturing stage of the support by a factory or the like, the coat layers 46 and 76 are formed only in a range where the upper surface 4b of the base plate 4 and the lower surface 7a of the lower mounting plate 7 are in contact with each other in the assembled state. At the bridge construction site, the dry film lubricant can be applied at the stage of sliding the support. In this case, there is no need to worry about deterioration or peeling of the sliding surface after a long time has passed since the installation of the support.

  Next, an example of a slip test of the bearing device according to the present invention will be described.

  The sliding test was performed using a metal plate assuming the lower mounting plate 7 (hereinafter referred to as “upper sliding plate”) and a metal plate assuming the base plate 4 (hereinafter referred to as “lower sliding plate”). As the upper sliding plate, a flat plate having a plate thickness of 12 mm and a planar dimension of 80 mm × 80 mm was used, and as the lower sliding plate, a flat plate having a thickness of 12 mm and a planar dimension of 100 mm × 200 mm was used.

The structure on the sliding surface side of each of the upper sliding plate and the lower sliding plate was one of the following four types of specifications.
Specification A: Metal spray rust prevention layer only Specification B: Metal spray rust prevention layer + rust preventive lubricant baked film containing molybdenum disulfide Specification C: Metal spray rust preventive layer + rust preventive lubricant baked film containing molybdenum disulfide + Coating layer specification D containing fluororesin D: Metal sprayed rust prevention layer + sheet layer containing fluororesin

  Table 1 shows combinations of the structure on the sliding surface side of the upper sliding plate and the structure on the sliding surface side of the lower sliding plate.

  In any of the reference examples in Table 1 and Examples 1 to 3, the metal spray rust-preventing layer was an aluminum-magnesium alloy layer formed by a hot-wire plasma spraying method using an alloy wire composed of 95 wt% aluminum and 5 wt% magnesium. . At this time, the thickness of the metal sprayed rust-preventing layer was set to 100 μm or more, and the surface roughness (Ry) was adjusted to 30 μm or less.

  In Examples 1 and 2, the rust-preventive lubricant baked film had a thickness of 15 μm or more, and the coating layer was formed by spray coating using polytetrafluoroethylene as the fluororesin.

  Furthermore, in Example 3, the fluororesin sheet used for the sheet layer is a polytetrafluoroethylene sheet (Example 3-1) having a thickness of 0.2 mm and a polytetrafluoroethylene sheet having a thickness of 1 mm. Three types of sheet layers were formed: (Example 3-2) and a polytetrafluoroethylene sheet (Example 3-3) subjected to glass fiber reinforcement treatment having a thickness of 0.2 mm.

  In the test method, the upper slide plate and the lower slide plate are overlapped, and the load is loaded in the direction perpendicular to the plate plane, while the position of the upper slide plate is fixed, the lower slide plate is displaced in the horizontal direction by a hydraulic cylinder, The reciprocating sliding was made along the longitudinal direction of the lower sliding plate. The test conditions at that time were such that the input waveform was a sine wave with a frequency of 0.047 Hz and a displacement in the horizontal direction of ± 50 mm was given twice. In addition, the loading load in the direction orthogonal to the plate material was set to three types with surface pressures of 3 Mpa, 6 Mpa, and 9 Mpa.

  Then, a horizontal friction force generated during sliding was measured by a load cell (load meter) attached to the hydraulic cylinder, and a friction coefficient μ was calculated from the friction force and the above-described load. FIG. 12 shows a history curve of the first embodiment, and FIG. 13 shows a history curve of the second embodiment. FIG. 14 shows the friction coefficient μ of Examples 1 and 2, and FIG. 15 shows the friction coefficient μ of Examples 3-1 to 3-3.

  As shown in FIG. 14, in Example 2, the friction coefficient μ was 0.1 or less at any surface pressure, and it was found that a low friction coefficient suitable for sliding could be obtained. Further, in Example 2, even when the surface pressure was increased, the variation in the friction coefficient μ was small, and no damage to the surface of the metal sprayed rust-preventing layer was observed.

  Further, in Example 1, it was found that although the friction coefficient μ slightly varied, a low friction coefficient could be obtained and the film had good characteristics. Although the test result of the reference example is not shown, the friction coefficient μ is 0.4 or more.

  Further, as shown in FIG. 15, in any of Examples 3-1 to 3-3, the friction coefficient μ is 0.1 or less, and even when the surface pressure is increased, the friction coefficient μ varies. It was found that small and good characteristics can be obtained.

1 (1a, 1b) Bearing device 2 Laminated rubber body 2b Elastic material layer 2c Rigid material layer 2d Upper reinforcing plate 2e Lower reinforcing plate 3 Sole plate 3a Upper surface of sole plate 3b Lower surface of sole plate 3c Mounting hole 4 Lower surface of base plate 4b Upper surface of base plate 4c Main mounting hole 4d Temporary mounting hole 5 (5a, 5b) Hexagon bolt 6 Upper mounting plate 7 Lower mounting plate 7a Lower surface of lower mounting plate 8 Upper structure 9 Upper anchor bolt 10 Upper mounting bolt 11 Lower structure 12 Lower anchor bolt 13 Lower mounting bolt 21 Bridge girder 22 Bridge pier 41 Plate body 42 Metal sprayed rust preventive layer 43 Anticorrosive lubricant baking film 44 Coat layer 45 Sheet layer 46 Coat layer 71 Plate body 72 Metal sprayed rust preventive layer 73 Antirust lubrication Agent baking film 74 Coat layer 75 Sheet layer 76 Coat layer

Claims (11)

A support body having an upper mounting plate coupled to the upper surface side and a lower mounting plate coupled to the lower surface side, a sole plate installed between the upper mounting plate and the upper structure, and the lower mounting plate A base plate installed between the lower structure and the mounting position of the support body by sliding the lower mounting plate horizontally with the base plate while supporting the load of the upper structure. A bearing device for adjusting
On each sliding surface side of the lower mounting plate and the base plate, a metal spray rust prevention layer and a lubrication layer based on the metal spray rust prevention layer were sequentially laminated from the plate body toward the sliding surface. A bearing device characterized by. A support body having an upper mounting plate coupled to the upper surface side and a lower mounting plate coupled to the lower surface side, a sole plate installed between the upper mounting plate and the upper structure, and the lower mounting plate A base plate installed between the lower structure and the support body by sliding the upper mounting plate horizontally with the sole plate while supporting the load of the upper structure. A bearing device for adjusting the position,
On the sliding surface side of each of the upper mounting plate and the sole plate, a metal spray rust prevention layer and a lubrication layer based on the metal spray rust prevention layer were sequentially laminated from the plate body toward the sliding surface. A bearing device characterized by that.   The metal spray rust preventive layer is obtained by spraying at least one selected from the group consisting of zinc, aluminum, zinc-aluminum alloy or pseudo alloy, aluminum-magnesium alloy or pseudo alloy, and zinc-aluminum-magnesium alloy or pseudo alloy. The bearing device according to claim 1 or 2, wherein   The lubricating layer is applied to a rust preventive lubricant baked film containing molybdenum disulfide, and the sliding surface side surface of the rust preventive lubricant baked film, and is at least one of fluororesin, molybdenum disulfide, and graphite. The bearing device according to claim 1, wherein a surface of the coat layer constitutes the sliding surface. The metal spray rust prevention layer has a thickness of 100 μm or more and a surface roughness (maximum height Ry) of 30 μm or less,
The bearing device according to claim 4, wherein the rust preventive lubricant baked film has a thickness of 15 μm or more.   The lubricating layer is provided on a surface of the sliding surface side of the metal spray rust-proof layer, and includes a sheet layer containing at least one of a fluororesin, a polyethylene resin, a polyester resin, and graphite. The bearing device according to claim 1, wherein a surface constitutes the sliding surface. The metal spray rust prevention layer has a thickness of 100 μm or more and a surface roughness (maximum height Ry) of 30 μm or less,
The bearing device according to claim 6, wherein the sheet layer has a thickness of 0.2 mm or more and 1.0 mm or less.   The lubricating layer is formed of a coating layer made of a dry film lubricant containing at least one of molybdenum disulfide, graphite, and fluororesin, and the surface of the coating layer constitutes the sliding surface. The bearing device according to 1, 2 or 3.   The bearing apparatus according to claim 8, wherein the metal spray rust-proof layer has a thickness of 100 µm or more and a surface roughness (maximum height Ry) of 30 µm or less.   The bearing device according to claim 1, wherein the bearing body is a laminated rubber body in which rigid material layers and elastic material layers are alternately laminated.   The bearing device according to claim 10, wherein the laminated rubber body is a laminated rubber body with a lead plug into which columnar lead is inserted.

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