JP2008208657A - Rubber bearing body mounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber bearing body mounting method in which mounting error is absorbed easily and with high reliability, without causing warping etc. of a mounting plate. <P>SOLUTION: According to the rubber bearing body mounting method, a plurality of correction holes 8 each having a length that can absorb the mounting error in a bridge axial direction, are bored in a lower mounting plate 3, and permanently fixing key blocks 14 that match with the respective correction holes 8 and can be fitted into the same, are separately prepared, followed by sliding the lower mounting plate 3 by a posterior deflection amount in a post sliding method. Thereafter, when the lower mounting plate 3 is mounted, the permanently fixing key blocks 14 each having a drill hole 16 formed at a location corresponding to a permanently fixing screw hole 18 formed in a base plate 5, are fitted in the respective correction holes 8, and permanently fixing bolts 17 are penetrated in the respective drill holes 16 to be screwed and fixed into the permanently fixing screw holes 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is for mounting a rubber girder on a bridge girder side or a pier side when the bridge girder is installed on a pier via a rubber bearing body having an upper mounting plate on the upper surface and a lower mounting plate on the lower surface. Concerning the method.

  For example, a post-slide method as disclosed in Patent Document 1 is known as a method for attaching a rubber bearing body when, for example, a concrete bridge girder is installed on a pier via a rubber bearing body. This is because the lower mounting plate attached to the lower surface of the rubber bearing is temporarily fixed to the pier, while the bridge girder is built on the upper mounting plate attached to the upper surface, prestress is introduced, and the lower mounting plate is left for a certain period of time, then the lower mounting In addition to the amount of elastic shear shortening due to pre-stress of bridge girders and the amount of creep drying shrinkage after the introduction of pre-stress, the amount of horizontal shear deformation of the rubber bearing body is removed by releasing the temporary fixing between the plate and the pier. Move the lower mounting plate horizontally by an amount that compensates for the horizontal shear deformation of the rubber base based on the remaining creep dry shrinkage predicted from the dry shrinkage, and then permanently fix the lower mounting plate to the support base. It has become a method.

Japanese Patent No. 2757728 JP 2000-234392 A JP 7-173872 A Japanese Utility Model Publication No. 7-17837

  In the above-mentioned post slide method, the lower mounting plate moved in the horizontal direction is permanently fixed to the base plate on the pier by welding, so there is a risk that the lower mounting plate will warp due to heat during welding. There was a possibility that the pier made of the crack might occur. Therefore, when bolt fixing is adopted, as disclosed in Patent Documents 2 to 4, a large-diameter hole is drilled in the lower mounting plate in a range that can absorb mounting errors, and a long hole is drilled in this large-diameter hole. A method of absorbing mounting errors by fitting the provided metal fittings to allow the bolts to pass through the long holes and adjusting the positions of the long holes in the large-diameter holes and the bolts in the long holes can be considered. However, in this case, if a large shearing force is applied in the direction of the bridge axis due to an earthquake or a contraction due to a temperature difference, the bolt may be damaged or the lower mounting plate may be displaced. Patent Document 2 also describes that a long hole is filled with a grout agent or the like and cured, but the number of steps increases, leading to an increase in cost.

  Therefore, the present invention can easily and reliably absorb the mounting error of the rubber bearing body without causing warpage of the mounting plate when mounting the upper and lower mounting plates of the rubber bearing body. An object of the present invention is to provide a method for attaching a rubber bearing.

In order to achieve the above object, the invention according to claim 1 is a rubber bearing comprising an upper mounting plate on the upper surface and a lower mounting plate on the lower surface between the bridge girder and the pier supporting the bridge girder. The upper mounting plate is attached to the sole plate on the bridge girder side, and the lower mounting plate is attached to the base plate on the bridge pier side with bolts at predetermined screwing positions, either the upper mounting plate or the lower mounting plate. On the other hand, a plurality of correction holes having a length capable of absorbing the mounting error in the bridge axis direction are drilled in advance, and a separate adjustment member that can be fitted in accordance with each correction hole is prepared and corrected. When attaching the upper mounting plate or the lower mounting plate in which the holes are formed, the adjustment members having the drill holes at the positions corresponding to the screwing positions of the sole plate or the base plate are fitted in the respective correction holes, respectively. It is characterized in that the belt by respectively through the drilled hole to secure by screwing the screwing position.
In addition to the object of the first aspect, the bridge girder has a prestressed concrete structure, one of the upper mounting plate and the lower mounting plate is fixed with a bolt, and the other is mounted after the prestress is introduced. In the post-slide method of fixing the slide after fixing the mounting error after waiting for the shear deformation of the rubber bearing body accompanying the creep drying shrinkage of the bridge girder, to easily attach the mounting plate on the slide side, A correction hole is formed in the mounting plate on the slide side, and the mounting plate is fixed with an adjusting member and a bolt after sliding in the bridge axis direction.
In addition to the object of the first or second aspect, the invention described in claim 3 is provided with a correction hole in the lower mounting plate in order to improve the workability at the time of mounting, and the lower mounting plate is provided with the adjusting member and the bolt. Is fixed to the base plate.
According to a fourth aspect of the present invention, in addition to the object of any one of the first to third aspects, in order to suitably cope with the floating of the mounting plate in addition to the horizontal shearing force, the adjustment member is a bolt. A flange that abuts against the surface of the upper mounting plate or the lower mounting plate in a fixed state is provided.

According to the first aspect of the present invention, it is possible to reliably absorb the mounting error by using the correction hole and the adjustment member. In particular, since welding is not employed for fixing the upper and lower mounting plates, the occurrence of warping of the mounting plates and cracks of the bridge girders and piers associated therewith is eliminated.
Moreover, even if a large shearing force is applied in the direction of the bridge axis due to an earthquake or a contraction due to a temperature difference, there is no possibility that the bolt is damaged or the mounting plate is displaced, so the reliability after construction is improved.
According to the second aspect of the invention, in addition to the effect of the first aspect, the slide-side mounting plate can be easily attached even in the post-slide method in which the final fixing position is difficult to be determined by creep drying shrinkage.
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the lower mounting plate is fixed by the adjusting member and the bolt, so that the workability at the time of mounting is improved.
According to invention of Claim 4, in addition to the effect in any one of Claims 1 thru | or 3, by providing the adjustment member with the flange, in addition to the horizontal shearing force, the lifting force (lifting) of the mounting plate can be increased. Can be dealt with suitably, and the reliability after construction becomes higher.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are operational process diagrams showing an example of a method for attaching a rubber bearing according to the present invention, in which the upper side is a plane, the lower side is a side surface, and the left-right direction is a bridge axis direction. Here, a case where the present invention is applied to a post-slide construction method in which a bridge girder of a prestressed concrete structure (PC structure) is fixed on a bridge pier via a rubber support will be described.
First, as shown in FIG. 1A, the rubber support 1 is installed between a sole plate 4 fixed to the lower surface of the bridge girder and a base plate 5 fixed to the upper surface of the bridge pier. Here, the rubber support 1 has a well-known structure in which steel plates and damping rubber are alternately laminated and the periphery is covered with a cover rubber. The upper mounting plate 2 is on the upper surface and the lower mounting plate 3 is on the lower surface. Are fixed to each other. In this installed state, the upper mounting plate 2 is permanently fixed to the sole plate 4 by bolts 6,..., And the lower mounting plate 3 is temporarily fixed to the base plate 5 by temporary fixing bolts 7, 7. .

In the lower mounting plate 3, at both ends of the rubber support 1 sandwiched in the bridge width direction (vertical direction in the plan view), at least in the bridge axis direction, this corresponds to the maximum error of the design value of the post-strain amount ε described later. Three correction holes 8, 8... Having an oblong length in plan view are formed. A temporary fixing key block 9 having the same shape as the correction hole 8 and having a flange 10 having a diameter larger than that of the correction hole 8 is fitted to each correction hole 8. For temporary fixing of the lower mounting plate 3, each temporary fixing bolt 7 is screwed into a temporary fixing screw hole 11 formed in advance in the base plate 5 through a drill hole drilled in the center of the temporary fixing key block 9. Is done.
Further, this temporary fixing position is not a position where the center line L2 of the rubber support 1 is aligned with the center line L1 of the base plate 5, but is opposite to the center side of the span (right side of the figure) as shown in FIG. It is set at a position that is decentered by the design value of the rear strain amount ε on the side.

After the lower mounting plate 3 is temporarily fixed in this way, prestress is introduced into the pier and left for a certain period. Then, as the bridge girder contracts due to shortening due to prestress and creep drying shrinkage after the prestress is introduced, the rubber bearing body 1 undergoes shear deformation (post strain) toward the center of the span as shown in FIG.
After the creep drying shrinkage is completed, the temporary fixing bolt 7 and the temporary fixing key block 9 are removed, and the mounting error is corrected based on the actual post-strain amount ε ′. As shown in FIG. 2 (A), jacks 12 and 12 are attached to the side surface of the base plate 5 on the center side of the span, and the jack 12 attaches the lower mounting plate 3 to the center side of the span (in the direction of the arrow) by the amount of rear strain ε ′. It is done by pulling to and sliding. Reference numerals 13 and 13 denote guide blocks which are fixed to side surfaces of the base plate 5 parallel to the bridge axis direction and guide the slide of the lower mounting plate 3.

  After the lower mounting plate 3 is slid, the jack 12 and the guide block 13 are removed, and the lower mounting plate 3 is permanently fixed to the base plate 5. For the main fixing, as shown in FIG. 3, for the main fixing as an adjusting member having the same shape as the correction hole 8 of the lower mounting plate 3 and having a flange 15 having a diameter larger than that of the correction hole 8 at the upper end. A key block 14 is used. That is, after the drilling holes 16 are formed in the main fixing key block 14 at positions corresponding to the main fixing screw holes 18 processed in the base plate 5 in advance, the main fixing key block 14 is fitted into the correction hole 8 respectively. Then, the main fixing bolt 17 that penetrates the through hole 16 of each main fixing key block 14 is screwed into the main fixing screw hole 18. Therefore, as shown in FIG. 2B, even if an error | ε−ε ′ | occurs between the post-strain amount ε of the design value and the actual post-strain amount ε ′, a drill hole is formed in the fixing key block 14. By aligning the processing position of 16 with the position of the main fixing screw hole 18 and shifting it by an error | ε−ε ′ | from the center to the bridge axis direction, the main fixing can be performed without any trouble. Further, in this fixed state, the flange 15 of the main fixing key block 14 contacts the surface of the lower mounting plate 3 to press the lower mounting plate 3 downward to prevent the lower mounting plate 3 from being lifted.

  As described above, according to the mounting method of the rubber bearing body of the above embodiment, a plurality of correction holes 8 having a length capable of absorbing the mounting error in the bridge axis direction are formed in the lower mounting plate 3 in advance, and the respective corrections are made. When a separate main fixing key block 14 that can be fitted to fit the hole 8 is prepared and the lower mounting plate 3 is attached, the main fixing screw hole 18 of the base plate 5 is inserted into each correction hole 8. The main fixing key blocks 14 formed with the drill holes 16 at the corresponding positions are respectively fitted, and the main fixing bolts 17 are respectively passed through the drill holes 16 and screwed into the main fixing screw holes 18 to be fixed. The mounting error of the lower mounting plate 3 can be reliably absorbed. In particular, since welding is not employed for fixing the lower mounting plate 3, occurrence of warpage of the lower mounting plate 3 and cracks of the piers accompanying the warpage is eliminated. In addition, even if a large shearing force is applied in the direction of the bridge axis due to an earthquake or a contraction due to a temperature difference, the fixing bolt 17 is not damaged or the lower mounting plate 3 is not displaced. Get higher.

Further, here, the upper mounting plate 2 is fixed with bolts 6 and the lower mounting plate 3 is slid in the direction of the bridge axis while waiting for the shear deformation of the rubber bearing body 1 accompanying the creep drying shrinkage of the bridge girder after the prestress is introduced. In the post-slide method in which the fixing error is fixed after fixing, the correction hole 8 is formed in the lower mounting plate 3, and the main mounting key block 14 and the main fixing are performed after the lower mounting plate 3 is slid in the bridge axis direction. Since the bolts 17 are fixed, the lower mounting plate 3 can be easily attached even in the post-slide method in which the final fixing position is difficult to be determined by creep drying shrinkage. In particular, since the correction hole 8 is provided in the lower mounting plate 3 and the lower mounting plate 3 is fixed to the base plate 5 by the main fixing key block 14 and the main fixing bolt 17, workability during mounting is also improved. Yes.
Further, the upper fixing force of the lower mounting plate 3 in addition to the horizontal shearing force is provided in the main fixing key block 14 by providing a flange 15 that is in contact with the surface of the lower mounting plate 3 while being fixed by the main fixing bolt 17. (Floating) can be suitably handled, and reliability after construction becomes higher.

  In the above embodiment, the lower mounting plate is fixed after the creep dry shrinkage is completed and the position of the bolt is determined. However, even after the creep dry shrinkage is finished, the subsequent shrinkage amount is predicted. The lower mounting plate may be fixed by setting the position of the drill hole in the main fixing key block based on a size obtained by adding the future distortion amount to the previous distortion amount. In this case, the main fixing can be performed quickly and the construction period can be shortened. In addition, when fixing in the middle of creep drying shrinkage in this way, even if there is an error in the amount of distortion predicted when creep drying shrinkage is completed, the position of the drill hole is changed according to the error. If it is replaced with a key block, it can be easily corrected to the proper position.

  On the other hand, the adjustment member is not limited to the flanged block as in the above embodiment, but as a straight oval block 19 that matches the correction hole 8 as shown in FIG. The lower mounting plate 3 may be prevented from being lifted by attaching the stopper plate 20 to the base plate 5 by passing the fixing bolts 17 through the through holes 16 formed in both of them. Here, the stopper plate 20 can be replaced by a washer having a diameter larger than that of the correction hole 8.

  Further, in the above embodiment, the final fixing key block which is an adjustment member has a drill hole formed in only one place, and it is necessary to process the drill hole each time it is attached, as shown in FIG. , End blocks 22, 22 matching both ends of the correction hole 8, a drill hole block 23 in which a drill hole 16 is formed, and a spacer block 24 interposed between the end blocks 22, 22 and the drill hole block 23. If the adjustment block 21 formed by dividing the correction hole 8 into a plurality of parts in the longitudinal direction of the correction hole 8 is employed, only the positions of the drill hole block 23 and the spacer block 24 between the end blocks 22 and 22 are changed. Thus, the position of the drill hole 16 can be easily adjusted. In this case as well, it is desirable to use the stopper plate 20. Of course, the length of each block and the number of spacer blocks may be appropriately changed.

Furthermore, the correction hole and the adjustment member are not limited to the oval shape, and other shapes such as a circle may be used as long as the mounting error in the bridge axis direction can be absorbed. If a drill hole is drilled and fixed with a bolt, the same effect as the above embodiment can be maintained.
On the other hand, although the oval temporary fixing key block is used for temporary fixing in the above embodiment, temporary fixing may be performed by other means such as a bolt and a washer without using such a key block.

In the above embodiment, the correction hole is provided in the lower mounting plate and fixed with the adjusting member and the bolt. However, in the opposite case, the correction hole is formed in the upper mounting plate. Similarly to the above, it is of course possible to fix with the adjusting member and the bolt in the temporary fixing, leaving for a certain period of time, adjusting the post-distortion, and the main fixing. In this case, although slightly inferior to the lower mounting plate side in terms of workability, the effect of reliably and reliably performing mounting errors in the bridge axis direction without causing warpage of the upper mounting plate is the same as in the above embodiment. Is obtained.
In addition, in the above embodiment, the present invention is applied to the post-slide method of the prestressed concrete structure bridge girder. Since an attachment error may occur, the present invention using the correction hole and the adjustment member can be applied in this case as well.

It is a work process figure of the attachment method of a rubber bearing body, (A) shows an installation state, (B) shows a neglected state after prestress introduction, respectively. It is a work process figure of the attachment method of a rubber bearing body, (A) shows the adjustment state of the amount of back distortion, and (B) shows the final fixed state, respectively. It is explanatory drawing of this fixed key block, an upper side shows a plane and the lower side shows a side surface, respectively. (A) is an explanatory view of a stopper plate, (B) is an explanatory diagram of an oval block, each showing a plane on the bottom and a side on the bottom. (A) is an explanatory view of a stopper plate, (B) is an explanatory view of an adjustment block, and the upper side shows a flat surface and the lower side shows a side surface, respectively.

Explanation of symbols

  1 .... Rubber support body 2 .... Upper mounting plate 3 ... Lower mounting plate 4 ... Sole plate 5 ... Base plate 8 ... Compensation hole 12 ... Jack 14 ... Main locking key Block, 15 ... Flange, 16 ... Drill hole, 17 ... Main fixing bolt, 18 ... Main fixing screw hole, 19 ... Elliptical block, 20 ... Stopper plate, 21 ... Adjustment block, 22 ... -End block, 23 ... Drill hole block, 24 ... Spacer block.

Claims (4)

Between the bridge girder and the bridge pier supporting the bridge girder, an upper mounting plate is interposed on the upper surface, and a rubber support body having a lower mounting plate on the lower surface is interposed, and the upper mounting plate is disposed on the sole plate on the bridge girder side. A method of attaching the lower mounting plate to the base plate on the pier side with a bolt at a predetermined screwing position, respectively,
A plurality of correction holes having a length capable of absorbing a mounting error in the bridge axis direction are drilled in advance in either one of the upper mounting plate or the lower mounting plate, and each of the correction holes can be fitted in accordance with each correction hole. Prepare body adjustment members,
When attaching the upper mounting plate or the lower mounting plate in which the correction hole is formed, the adjustment member in which a drill hole is formed in a position corresponding to the screwing position of the sole plate or the base plate in each correction hole. A method for attaching a rubber bearing body, characterized in that each is fitted, and the bolts are passed through the drill holes and screwed into the screwing positions.   The bridge girder has a prestressed concrete structure, one of the upper mounting plate and the lower mounting plate is fixed with bolts, and the other is awaited for shear deformation of the rubber bearing body due to creep drying shrinkage of the bridge girder after the prestress is introduced. If the mounting error is fixed after fixing in the bridge axis direction, a correction hole is drilled in the other mounting plate, and the mounting plate is adjusted after sliding in the bridge axis direction. 2. The method for attaching a rubber bearing body according to claim 1, wherein the rubber bearing body is fixed with a member and a bolt.   3. The method of mounting a rubber support according to claim 1, wherein the correction hole is provided in the lower mounting plate, and the lower mounting plate is fixed to the base plate by an adjustment member and a bolt.   4. The method of attaching a rubber bearing body according to claim 1, wherein a flange that contacts the surface of the upper mounting plate or the lower mounting plate in a fixed state with a bolt is provided around the adjustment member.

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