JP6911387B2 - Temporary bearing - Google Patents

Description

The present invention relates to a temporary bearing provided between a substructure of a bridge and a bridge girder to support the bridge girder.

During the construction of a continuous bridge girder by the overhanging erection method, it is necessary to support the continuous bridge girder by a temporary bearing installed on the substructure (for example, pier) of the bridge and receive the load of the continuous bridge girder by the temporary bearing (for example). , Patent Document 1). Hereinafter, the reference numerals used in Patent Document 1 are shown in parentheses, and the techniques described in Patent Document 1 will be briefly described.

According to Patent Document 1, after the pier (1) is constructed, the main bearing (13) is installed at the top of the pier (1). Further, a PC steel rod (9) is installed on the pier (1), and the PC steel rod (9) is projected upward from the top end of the pier (1). Further, a plurality of temporary bearing concrete blocks (5a, 5b) are placed on the top of the pier (1), but these concrete blocks (5a, 5b) are not attached to the pier (1) and are simply placed. It is only placed on the top of the pier (1). Next, a part of the bridge girder (7) is installed on the concrete block (5a, 5b), and the pier (1) and the bridge girder (7) are temporarily fixed using the PC steel rod (9). Further, H steel (12) is embedded so as to straddle the bridge girder (7) and the pier (1).

When the bridge girder (7) is supported as described above, the concrete blocks (5a, 5b) bear the vertical load of the bridge girder (7) and resist the compression due to the vertical load. The PC steel rod (9) bears an upward load on the bridge girder (7) and resists tension due to the load. The H-section steel (12) bears the horizontal load of the bridge girder (7) and resists shearing due to the horizontal load.

After constructing the bridge girder (7) by the overhanging erection method, the PC steel rod (9) is removed. Then, the concrete block (5a, 5b) is cored out to divide the concrete block (5a, 5b) into upper and lower parts, and then the remaining part of the concrete block (5a, 5b) is crushed. As a result, the concrete blocks (5a, 5b) are removed. Further, the portion of the H steel (12) between the bridge girder (7) and the pier (1) is cut (however, the cutting of the H steel (12) is not disclosed in Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-241582

By the way, the step of removing the PC steel rod (9) and the concrete block (5a, 5b) and the step of cutting the H steel (12) are critical paths. That is, the subsequent steps cannot be carried out unless the tensile resistance due to the PC steel rod (9), the compressive resistance due to the concrete blocks (5a, 5b), and the shear resistance due to the H steel (12) are released. Although the PC steel rod (9) can be removed in a short time, the concrete block (5a, 5b) cannot be removed and the H steel (12) cannot be cut in a short time. This is because the space between the lower surface of the bridge girder (7) and the top end of the pier (1) is narrow, and the work of removing the concrete blocks (5a, 5b) and cutting the H steel (12) cannot be easily performed. It depends on the reason.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily release the compression resistance and the shear resistance of the temporary bearing against the load of the bridge girder in a short time.

In order to solve the above problems, according to the first aspect of the present invention, the temporary bearings provided between the top end of the substructure of the bridge and the lower surface of the bridge girder are the lower block, the upper block, and the first space. The lower block is provided with a padding material and a second padding material, and has a lower block main body portion fixed to the top end of the lower structure and a recess recessed in the upper surface of the lower block main body portion. Then, the upper block is fixed to the lower surface of the bridge girder, is projected on the lower surface of the upper block main body and the upper block main body arranged above the lower block main body, and is fitted into the concave portion. The first inner surface and the second inner surface of the concave portion rise from the bottom surface of the concave portion to the upper surface of the lower block main body portion, and are adjacent to each other so as to form an inside corner. The first side surface and the second side surface rise from the lower surface of the convex portion to the lower surface of the upper block main body portion and are adjacent to each other so as to form a protruding corner, and the first side surface of the convex portion is on the first inner surface of the concave portion. The second side surface of the convex portion is abutted against the second inner surface of the concave portion, and the first padding material is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body. The second filling material is sandwiched between the lower surface of the convex portion and the bottom surface of the concave portion, and the concave portion opens on the side surface of the lower block main body portion, so that the first filling material and the second filling material and the second filling material are opened. The padding appears on the side surface of the lower block body .

Further, in order to solve the above problems, according to the second aspect of the present invention, the temporary bearings provided between the top end of the substructure of the bridge and the lower surface of the bridge girder are the lower block, the upper block, and the first. The upper block includes a one-seat filling material and a second filling material, and the upper block has an upper block main body portion fixed to the lower surface of the bridge girder and a recess recessed in the lower surface of the upper block main body portion. The lower block is fixed to the top end of the lower structure, is projected onto the lower block main body portion arranged below the upper block main body portion, and the upper surface of the lower block main body portion, and is fitted into the concave portion. The first inner surface and the second inner surface of the concave portion have a convex portion, and the first inner surface and the second inner surface of the concave portion descend from the top surface of the concave portion to the lower surface of the upper block main body portion, and are adjacent to each other so as to form an inside corner. The first side surface and the second side surface of the convex portion rise from the upper surface of the convex portion to the upper surface of the lower block main body portion, and are adjacent to each other so as to form a protruding corner, and the first side surface of the convex portion is the concave portion. It is abutted against the first inner surface, the second side surface of the convex portion is abutted against the second inner surface of the concave portion, and the first space is between the upper surface of the lower block main body and the lower surface of the upper block main body. The stuffing material is sandwiched, the second stuffing material is sandwiched between the upper surface of the convex portion and the top surface of the concave portion, the concave portion opens on the side surface of the upper block main body portion, and the first stuffing is performed. The material and the second padding material appear on the side surface of the upper block body .

According to the first side surface and the second side surface of the present invention, since the first side surface of the convex portion is abutted against the first inner surface of the concave portion, the horizontal load in the direction in which the first side surface is pressed against the first inner surface thereof. Temporary bearings can resist shearing due to. Further, since the second side surface of the convex portion is abutted against the second inner surface of the concave portion, the temporary bearing can resist shearing due to a horizontal load in the direction in which the second side surface is pressed against the second inner surface. Since the temporary bearing resists shearing, it is not necessary to install the conventional H steel.
Since the first padding material and the second padding material are sandwiched between the lower block and the upper block, the temporary bearing can resist compression due to the vertical load of the bridge girder, and the shear resistance of the temporary bearing increases. improves.
On the other hand, since the first filling material and the second filling material are only sandwiched between the lower block and the upper block, the first filling material and the second filling material can be used in a short time. It can be easily removed.
When the first filling material and the second filling material are removed, the compression resistance of the temporary bearing against the vertical load of the bridge girder is released, and the first side surface or the second side surface of the convex portion is the first inner surface or the second side surface of the concave portion. The shear resistance of the temporary bearing to the horizontal load in the direction pressed against the inner surface is greatly reduced. Therefore, even if the lower block and the upper block are not removed, the post-construction process of the bridge girder can be carried out within a short time from the removal of the first filling material and the second filling material.
Further, since the recess is opened on the side surface of the lower block main body or the side surface of the upper block main body, the second padding material can be easily removed.

According to the third aspect of the present invention, the temporary bearing provided between the top end of the substructure of the bridge and the lower surface of the bridge girder includes a lower block, an upper block and a padding material, and the lower block is the said. It has a lower block main body fixed to the top end of the lower structure and a recess recessed in the upper surface of the lower block main body, and the upper block is fixed to the lower surface of the bridge girder. It has an upper block main body portion arranged above the lower block main body portion and a convex portion projected on the lower surface of the upper block main body portion and fitted into the concave portion, and the inner surface of the concave portion is the lower block. The outer surface of the convex portion rises from the upper surface of the main body portion to form a curved surface, the outer surface of the convex portion falls from the lower surface of the upper block main body portion to form a curved surface, and the padding material forms an inner surface of the concave portion and the convex portion. It is sandwiched between the outer surface of the lower block main body and between the upper surface of the lower block main body and the lower surface of the upper block main body, and the recess is opened on the side surface of the lower block main body. A portion of the padding material sandwiched between the inner surface of the concave portion and the outer surface of the convex portion appears on the side surface of the lower block main body portion, and the upper surface and the upper portion of the lower block main body portion of the padding material. A portion sandwiched between the lower surface of the block main body and the lower surface of the block main body appears on the side surface of the lower block main body .

According to the fourth aspect of the present invention, the temporary bearing provided between the top end of the substructure of the bridge and the lower surface of the bridge girder includes a lower block, an upper block and a padding member, and the upper block is the said. It has an upper block main body portion fixed to the lower surface of the bridge girder and a concave portion recessed in the lower surface of the upper block main body portion, and the lower block is fixed to the top end of the lower structure and the upper portion is formed. It has a lower block main body portion arranged below the block main body portion and a convex portion projected on the upper surface of the lower block main body portion and fitted into the concave portion, and the inner surface of the concave portion is the upper block main body. The outer surface of the convex portion rises from the lower surface of the lower block body portion to form a curved surface, and the padding material forms an inner surface of the concave portion and an outer surface of the convex portion. It is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body, and the recess is opened on the side surface of the upper block main body to form the padding material. A portion sandwiched between the inner surface of the concave portion and the outer surface of the convex portion appears on the side surface of the upper block main body portion, and among the padding materials, the upper surface of the lower block main body portion and the upper block main body portion. A portion sandwiched between the lower surface and the lower surface of the upper block appears on the side surface of the upper block main body .

According to the third side surface and the fourth side surface of the present invention, since the padding material is sandwiched between the curved inner surface of the convex portion and the curved outer surface of the concave portion, the curved inner surface of the convex portion is the curved surface of the concave portion. Temporary bearings can resist shear due to horizontal loads in the direction pressed against the outer surface. Since the temporary bearing resists shearing, it is not necessary to install the conventional H steel.
Since the padding material is sandwiched between the lower block and the upper block, the temporary bearing can resist compression due to the vertical load of the bridge girder, and the shear resistance of the temporary bearing is improved.
On the other hand, since the padding material is only sandwiched between the lower block and the upper block, the padding material can be easily removed in a short time.
When the padding material is removed, the compression resistance of the temporary bearing against the vertical load of the bridge girder is released, and the shear resistance of the temporary bearing against the horizontal load is also released. Therefore, even if the lower block and the upper block are not removed, the post-construction process of the bridge girder can be carried out without waiting for the removal of the padding material.
Further, since the recess is opened on the side surface of the lower block main body or the side surface of the upper block main body, the padding material can be easily removed.

On the first or second side surface, the first filling material and the second filling material are made of powder or granular material.
According to the above, by spraying a fluid such as air on the first filling material and the second filling material, the first filling material and the second filling material as powder or granular materials can be blown off. Therefore, the first filling material and the second filling material can be easily removed.

On the first or second side surface, the first filling material and the second filling material are composed of a plurality of round bars in which the first filling material and the second filling material are laid down and bundled.
According to the above, the first filling material and the second filling material can be easily removed by rolling the round bar.

In the first or second side surface, the first filling material and the second filling material are filled with a plurality of spread flexible tubes and the flexible tubes in a compressed state. Has a fluid.
According to the above, when the fluid filled in the flexible tube is depressurized and the fluid flows out from the flexible tube, the compression resistance and the shear resistance of the temporary bearing can be released.

On the first or second side surface, the first filling material and the second filling material are made of a material softer than the upper block main body portion and the lower block main body portion.
Based on the above, it is easy to cut the first filling material and the second filling material. If the first filling material and the second filling material are cut, the first filling material and the second filling material can be easily removed.

According to the present invention, the compression resistance and the shear resistance of the temporary bearing with respect to the load of the bridge girder can be easily released in a short time.

FIG. 1 is a perspective view of a temporary bearing. FIG. 2 is a perspective view of the temporary bearing. FIG. 3 is an exploded perspective view of the temporary bearing. FIG. 4 is an exploded perspective view of the temporary bearing. FIG. 5 is a partial cross-sectional view of a temporary bearing according to a first modification in which the padding material is changed. FIG. 6 is a partial cross-sectional view of the temporary bearing according to the first modification. FIG. 7 is a partial cross-sectional view of a temporary bearing according to a second modification in which the padding material is changed. FIG. 8 is a partial cross-sectional view of the temporary bearing according to the second modification. FIG. 9 is a partial cross-sectional view of a temporary bearing according to a third modification in which the padding material is changed. FIG. 10 is a partial cross-sectional view of the temporary bearing according to the third modification. FIG. 11 is a perspective view of a set of temporary bearings. FIG. 12 is a side view for explaining one step when constructing a bridge. FIG. 13 is a plan view for explaining the process shown in FIG. FIG. 14 is a side view for explaining a step after the step shown in FIG. FIG. 15 is a plan view for explaining a step after the step shown in FIG. FIG. 16 is a side view for explaining a step after the step shown in FIG. FIG. 17 is a plan view for explaining a step after the step shown in FIG. FIG. 18 is a side view for explaining a step after the step shown in FIG. FIG. 19 is a side view for explaining a step after the step shown in FIG. FIG. 20 is a side view for explaining a step after the step shown in FIG. FIG. 21 is a perspective view of the temporary bearing according to the fourth modification. FIG. 22 is a perspective view of the temporary bearing according to the fifth modification. FIG. 23 is a perspective view of the temporary bearing according to the sixth modification. FIG. 24 is a perspective view of the temporary bearing according to the sixth modification. FIG. 25 is an exploded perspective view of the temporary bearing according to the sixth modification. FIG. 26 is an exploded perspective view of the temporary bearing according to the sixth modification. FIG. 27 is an exploded perspective view of the temporary bearing according to the seventh modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

<1. Temporary bearing>
1 and 2 are perspective views of the temporary bearing 10 by the central projection method (transparent projection method), and FIGS. 3 and 4 are exploded perspective views of the temporary bearing 10 by the parallel projection method.

The temporary bearing 10 is temporarily installed between the continuous bridge girder constructed by the overhanging erection method and the top end of the substructure (for example, pier or abutment) of the bridge. The temporary bearing 10 resists compression due to the vertical load of the continuous bridge girder during construction and also resists shearing due to the horizontal load of the continuous bridge girder. The temporary bearing 10 is used in combination with a tension material (for example, PC steel rod, PC steel stranded wire or other PC steel material) penetrating from the upper end of the continuous bridge girder to the inside of the substructure. The tensioning material resists tension due to loads in the direction in which the continuous bridge girder moves upward from the substructure.

The temporary bearing 10 is sandwiched between the lower block 20 fixed to the top end of the lower structure, the upper block 40 fixed to the lower surface of the continuous bridge girder, and the lower block 20 and the upper block 40, and these blocks 20. , 40 and 60, 70, which are separable from 40, are provided. Here, the fact that the packing materials 60 and 70 are separable from the blocks 20 and 40 means that the filling materials 60 and 70 are not chemically or physically fixed to the blocks 20 and 40.

<1-1. Lower block>
The lower block 20 is made of cast-in-place concrete or precast concrete. Reinforcing bars and / or steel frames may or may not be embedded in the lower block 20.

The main body portion (hereinafter referred to as the lower block main body portion) 21 of the lower block 20 is formed in a shape in which a rectangular parallelepiped concave portion 31 is formed on the upper surface 22 of the rectangular parallelepiped. The side surfaces 23 to 26 of the lower block main body 21 facing sideways form a quadrangular prism surface in which all four corners are right angles. The recess 31 is opened not only on the upper surface 22 of the lower block main body 21, but also on the adjacent side surfaces 25 and 26 of the lower block main body 21.

The bottom surface 32 of the recess 31 is parallel to the top surface 22 and the bottom surface of the lower block main body 21. The first inner surface 33 of the recess 31 is parallel to the side surfaces 23 and 25 of the lower block main body 21, and the second inner surface 34 adjacent to the first inner surface 33 is parallel to the side surfaces 24 and 26 of the lower block main body 21. Is parallel. Here, the first inner surface 33 has an inner surface 33 rising from the opposite side of the side separating the bottom surface 32 of the recess 31 and the side surface 25 of the lower block main body 21 to the upper surface 22 of the lower block main body 21, and the second inner surface 34 has a recess. It rises from the opposite side of the side separating the bottom surface 32 of 31 and the side surface 26 of the lower block main body 21 to the upper surface 22 of the lower block main body 21. The space surrounded by the inner surfaces 33 and 34 and the bottom surface 32 is the recess 31. Further, the first inner surface 33 and the second inner surface 34 are orthogonal to each other, and an inside corner 37 sandwiched between the first inner surface 33 and the second inner surface 34 is formed.

Flange 27, 28 is provided on the lower portion of the side surface 23, 25 of the lower block main body 21 so as to protrude from the side surface 23, 25. The flanges 27 and 28 are formed with through holes through which reinforcing bars 39 for fixing the lower block 20 to the pier are passed. The reinforcing bar 39 is fixed to the flanges 27 and 28.

The lower block main body 21 and the flanges 27 and 28 are integrally formed, and the lower surface of the flanges 27 and 28 and the lower surface of the lower block main body 21 are flush with each other. With the lower surfaces of the flanges 27 and 28 and the lower block main body 21 abutting against the top of the lower structure of the bridge, the reinforcing bars 39 are fixed to the concrete of the lower structure, so that the lower block 20 has a lower structure. It is fixed to the body.

The lower surfaces of the flanges 27 and 28 and the lower block main body 21 are not attached to the top end of the lower structure, but are in direct contact with the top end of the lower structure or are abutted with a sheet or the like sandwiched between them. .. This is so that the lower block 20 can be easily removed after the construction of the continuous bridge girder.

<1-2. Upper block>
The upper block 40 is made of cast-in-place concrete or precast concrete. Reinforcing bars and / or steel frames may or may not be embedded in the upper block 40.

The main body portion (hereinafter, referred to as the upper block main body portion) 41 of the upper block 40 is formed in a rectangular plate shape. The rectangular parallelepiped here means a rectangular parallelepiped whose thickness is smaller than the length and width.

A convex portion 51 is formed on the lower surface 42 of the upper block main body 41 so as to be integrated with the upper block main body 41. The convex portion 51 is provided in a rectangular parallelepiped shape, and the side surfaces 53 to 56 of the convex portion 51 facing sideways form a quadrangular prism surface in which all four corners are right angles. Therefore, the first side surface 53 of the convex portion 51 and the second side surface 54 adjacent thereto are orthogonal to each other, and a protruding corner 57 sandwiched between the first side surface 53 and the second side surface 54 is formed. The same applies to the angle between the side surface 54 and the side surface 55, the angle between the side surface 55 and the side surface 56, and the angle between the side surface 56 and the side surface 53. Further, the side surfaces 53 to 56 of the convex portion 51 are orthogonal to the lower surface 52.

The lower surface 52 of the convex portion 51 is parallel to the lower surface 42 and the upper surface 43 of the upper block main body 41. The first side surface 53 of the convex portion 51 and the second side surface 54 adjacent thereto rise vertically from the lower surface 52 of the convex portion 51 to the lower surface 42 of the upper block main body 41. The facing 55 of the first side surface 53 also rises vertically from the lower surface 52 of the convex portion 51 to the lower surface 42 of the upper block main body 41. The facing surface 56 of the second side surface 54 rises from the lower surface 52 of the convex portion 51 and is flush with the end surface 46 of the upper block main body portion 41.

A through hole through which a reinforcing bar 59 for fixing the upper block 40 to the bridge girder passes through the edge of the lower surface 42 of the upper block main body 41 is formed so as to penetrate to the upper surface 43 of the upper block main body 41. The reinforcing bar 59 is fixed to the upper block main body 41.

The upper block 40 is fixed to the continuous bridge girder by fixing the reinforcing bar 59 to the concrete of the continuous bridge girder in a state where the upper surface 43 of the upper block main body 41 is abutted against the lower surface of the continuous bridge girder.

The upper surface 43 of the upper block main body 41 is not attached to the lower surface of the continuous bridge girder, but is in direct contact with the lower surface of the continuous bridge girder or is abutted with a sheet or the like sandwiched between them. This is so that the upper block 40 can be easily removed after the construction of the continuous bridge girder.

<1-3. Opposition between the upper surface of the lower block body and the lower surface of the upper block body>
The upper block main body 41 is arranged above the lower block main body 21 in a state where the end surface 46 of the upper block main body 41 and the side surface 56 of the convex portion 51 are directed in the same direction as the side surface 26 of the lower block main body 21. ing. The upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 face each other with a space between them.

<1-4. Fitting of the convex part of the upper block and the concave part of the lower block body>
When the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 face each other, the convex portion 51 of the upper block 40 is fitted into the concave portion 31 of the lower block main body 21, and the convex portion The protruding corner 57 of 51 fits into the inner corner 37 of the recess 31.

In this state, the first side surface 53 of the convex portion 51 is abutted against the first inner surface 33 of the concave portion 31 and is in surface contact. Therefore, the horizontal load of the continuous bridge girder, more specifically, the horizontal load in the direction in which the first side surface 53 of the convex portion 51 is pressed against the first inner surface 33 of the concave portion 31 (see the arrow α in FIG. 1) is the lower block main body portion 21. Can be received by. Therefore, the temporary bearing 10 resists the shearing force due to the horizontal load in the direction of the arrow α.

Similarly, since the second side surface 54 of the convex portion 51 is in surface contact with the second inner surface 34 of the concave portion 31, the direction in which the second side surface 54 of the convex portion 51 is pressed against the second inner surface 34 of the concave portion 31 (FIG. 1). The horizontal load (see arrow β) is also received by the lower block main body 21. Therefore, the temporary bearing 10 resists shearing due to a horizontal load in the direction of arrow β.

Further, in addition to the surface contact between the first side surface 53 of the convex portion 51 and the first inner surface 33 of the concave portion 31, the second side surface 54 of the convex portion 51 is in surface contact with the second inner surface 34 of the concave portion 31. As a result, the rotational force around the vertical axis of the continuous bridge girder is also received by the lower block main body 21.

<1-5. Filling material>
A filling material 60 is sandwiched between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41. The filling material 60 is made of powder or granular material such as sand (for example, silica sand) and gravel. The upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 are provided so that the padding material 60 does not flow out from between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41. The gap between them is closed by a closing material (for example, a steel plate) 80 provided so as to surround the convex portion 51 of the lower block main body 21 and the upper block 40. The inside of the closing material 80 is filled with a filling material 60.

Similarly, the lower surface 52 of the convex portion 51 and the lower surface 32 of the concave portion 31 face each other with the padding material 70 sandwiched between them. The filling material 70 is also made of powder or granular material, and the gap between the lower surface 52 of the convex portion 51 and the bottom surface 32 of the concave portion 31 is closed by the closing material 80, so that the outflow of the filling material 70 is suppressed. ..

Since the padding members 60 and 70 are sandwiched between the lower block 20 and the upper block 40, the vertical load of the continuous bridge girder is received by the lower block main body 21 via the padding members 60 and 70. Therefore, the temporary bearing 10 resists compression due to the vertical load of the continuous bridge girder.
Further, by sandwiching the packing materials 60 and 70 between the lower block 20 and the upper block 40, the resistance of the temporary bearing 10 to shearing due to the horizontal load in the directions of the arrows α and β is improved.

By the way, after the continuous bridge girder is constructed by the overhanging erection method, it is necessary to support the continuous bridge girder with the main bearing. Therefore, it is necessary to remove the above-mentioned tension material and then remove the temporary bearing 10. When removing the temporary bearing 10, the padding materials 60 and 70 are removed before the blocks 20 and 40 are removed.

Specifically, first, the closing member 80 is removed from the lower block main body 21 and the convex portion 51 of the upper block 40 to expose the filling members 60 and 70. Subsequently, by injecting a fluid (compressed air, water, etc.) onto the filling materials 60 and 70, the filling materials 60 and 70 are blown off from between the lower block 20 and the upper block 40. Therefore, the filling materials 60 and 70 can be easily and quickly removed.

Here, since the recess 31 is opened on the side surfaces 25 and 26 of the lower block main body 21, the padding material 70 can be taken out from between the lower surface 52 of the convex portion 51 and the bottom surface 32 of the concave portion 31. In particular, by injecting the fluid from the side surface 25 side of the lower block main body 21 onto the filling material 70, the filling material 70 is scattered from the side surface 26 side to the outside, so that the filling material 70 can be easily removed.

By removing the padding members 60 and 70, the resistance of the temporary bearing 10 to compression is released, and the vertical load of the continuous bridge girder is transferred from the temporary bearing 10 to the main bearing. Further, the resistance of the temporary bearing 10 to shearing due to the horizontal load in the directions of the arrows α and β is also significantly reduced.

The steps of removing the padding materials 60 and 70 and the steps of removing the tension material are critical paths. That is, if the filling materials 60 and 70 are removed after removing the above-mentioned tension material, a step after the continuous bridge girder construction step (for example, a continuous bridge girder prestress step) can be carried out. Since the period of such a critical path can be minimized, the construction period of the bridge can be shortened. Further, since the blocks 20 and 40 can be removed in parallel with the subsequent process, the construction period of the bridge can be shortened.

Hereinafter, an example of changing the padding material 60 will be described. Since the padding material 70 can be changed in the same manner as the padding material 60, the description of the modification example of the padding material 70 will be omitted.

<1-5-1. Example of changing the filling material 1>
Instead of the packing material 60 made of powder or granular material, the filling material 61 is sandwiched between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 as shown in the cross-sectional view of FIG. ing. The filling material 61 is a bundle of a plurality of round steel rods 62 lying down, and these round steel rods 62 are such that the filling material 61 is formed by the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41. It is packed tightly in between. The axial direction of these round steel rods 62 is parallel to the side surfaces 23 and 25 of the lower block main body 21. The stoppers 81 and 82 provided on the side surfaces 23 and 25 of the lower block main body 21 project upward from the upper surface 22 of the lower block main body 21, and these round steel rods 62 are received by the stoppers 81 and 82. There is. Therefore, the round steel rod 62 is prevented from rolling out from the gap between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41.

The removal of the filling material 61 will be described.
After constructing a continuous bridge girder by the overhanging erection method, the stoppers 81 and 82 are removed as shown in FIG. Then, the round steel rod 62 can be rolled and the round steel rod 62 can be easily taken out from the gap between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41.

<1-5-2. Change example of padding material 2>
Instead of the packing material 60 made of powder or granular material, the filling material 64 is sandwiched between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 as shown in the cross-sectional view of FIG. May be. The packing material 64 includes a plurality of flexible pipes 65 spread parallel to each other between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41, and these in a compressed state. It has a fluid (eg, water or air) 66 filled in a flexible tube 65. Here, if a continuous bridge girder is not constructed on the upper block 40, as shown in FIG. 8, since the flexible pipe 65 is not compressed, a gap 67 between adjacent flexible pipes 65 is created. wide. On the other hand, when a continuous bridge girder is constructed on the upper block 40, as shown in FIG. 7, the flexible pipe 65 is compressed and deformed by the load of the continuous bridge girder. The gap 67 is narrowed.

Since the fluid 66 is filled in the flexible pipe 65 between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41, the fluid 66 is the upper surface 22 and the upper portion of the lower block main body 21. The state between the block main body 41 and the lower surface 42 can be easily maintained.

The removal of the padding material 64 will be described.
After constructing a continuous bridge girder by the overhanging erection method, the fluid 66 is depressurized. This causes the fluid 66 to flow out of the flexible tube 65. Then, the resistance of the temporary bearing 10 to compression and shear is released.
Then, after the fluid 66 flows out, the flexible tube 65 is removed.

<1-5-3. Change example of padding material 3>
Instead of the packing material 60 made of powder or granular material, the filling material 68 is sandwiched between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 as shown in the cross-sectional view of FIG. May be. The padding material 68 is a wedge made of a material softer than the block main bodies 21 and 41, which are concrete materials, and more specifically, a wooden wedge. Here, when the padding material 68 is used, the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 are not parallel to each other. That is, the upper surface 22 of the lower block main body 21 is inclined with respect to the lower surface 42 of the upper block main body 41, and the upper surface 22 and the lower surface 42 expand from the side surface 23 to the side surface 25.

The removal of the filling material 68 will be described.
After constructing a continuous bridge girder by the overhanging erection method, the filling material 68 can be taken out by horizontally cutting the filling material 68 with a chainsaw or the like as shown in FIG. Here, since the filling material 68 is softer than the concrete material, the filling material 68 can be easily cut.

<2. Combination of temporary bearings>
One temporary bearing 10 cannot resist the shearing force due to the horizontal load in the opposite directions of the arrows α and β shown in FIG. Therefore, two temporary bearings 10 are set as one set, and one set or a plurality of sets of temporary bearings 10 are installed between the continuous bridge girder and the substructure. As a result, the shearing force in a direction that cannot be resisted by one temporary bearing 10 is resisted by the other temporary bearing 10.

FIG. 11 is a perspective view showing a set of temporary bearings 10. In the following description, one of the set of temporary bearings 10 will be referred to as a temporary bearing 10A, and the other will be referred to as a temporary bearing 10B. Further, "A" is added to the code of the component of one temporary bearing 10A, and "B" is added to the component of the other temporary bearing 10B. Further, one set of temporary bearings 10, that is, a combination of temporary bearings 10A and 10B is referred to as a temporary bearing pair 11.

As shown in FIG. 11, one temporary bearing 10A and the other temporary bearing 10B are axisymmetric with respect to the vertical axis, and the installation orientation of one temporary bearing 10A is the installation orientation of the other temporary bearing 10B. Is rotated 180 ° around the vertical axis. That is, the side surface 53A of the convex portion 51A of the temporary bearing 10A is the side surface 55B of the convex portion 51B of the temporary bearing 10B, the side surface 55A of the convex portion 51A is the side surface 53B of the convex portion 51B, and the side surface 54A of the convex portion 51A is the convex portion 51B. The side surface 56B and the side surface 56A of the convex portion 51A are oriented in the same direction as the side surface 54B of the convex portion 51B.

In the example shown in FIG. 11, the temporary bearings 10A and the temporary bearings 10B are arranged side by side in close proximity to each other, and preferably the temporary bearings 10A and the temporary bearings 10B are arranged in the bridge axis direction or the beam width direction. However, if the temporary bearing 10A and the temporary bearing 10B are axisymmetric with respect to the vertical axis, it is not always necessary that the temporary bearing 10A and the temporary bearing 10B are close to each other, and the temporary bearing 10A and the temporary bearing 10B are arranged side by side. It is not always necessary to be there.

The lower block 20A and the lower block 20B may be integrated, and the upper block 40A and the upper block 40B may be integrated. That is, the side surface 24B of the lower block main body 21 and the side surface 24A of the lower block main body 21A are connected to each other, and the facing surface of the end surface 46B of the upper block main body 41B and the facing surface of the end surface 46A of the upper block main body 41A are connected to each other. You may. Alternatively, the side surface 26B of the lower block main body 21 and the side surface 26A of the lower block main body 21A may be connected to each other, and the end surface 46B of the upper block main body 41B and the end surface 46A of the upper block main body 41A may be connected to each other.

<3. Specific example>
Subsequently, a method of using the temporary bearing pair 11 will be described, and a method of constructing a bridge using the temporary bearing pair 11 will be described.

First, as shown in FIGS. 12 and 13, after constructing the substructure (for example, a bridge pier) 2, two main bearings (for example, a seismic isolation bearing) 3 are arranged in the bridge width direction to form the ceiling of the substructure 2. Install on the center of the edge. Further, the lower blocks 20A and the lower blocks 20B are alternately arranged in the bridge width direction on both sides of the main support 3 in the bridge axial direction, and these lower blocks 20A and 20B are fixed to the top end of the lower structure 2 by the reinforcing bars 39A and 39B.

Next, the closing member 80A is provided on the side surfaces 23A to 26A of the lower block main body 21A so that the closing member 80A projects upward from the upper surface 22A of the main body 21A. As a result, the lower block main body 21A is surrounded by the closing material 80A. Similarly, the lower block main body 21B is surrounded by the closing material 80B.
When the filling material 61A is used instead of the filling material 60A as described later, the stoppers 81A and 82A are provided on the side surfaces 23A and 25A so as to project upward from the upper surface 22 of the lower block main body 21A. .. The same applies when the padding material 61A is used instead of the padding material 60A.

Next, as shown in FIGS. 14 and 15, the filling materials 60A and 60B are arranged on the upper surfaces 22A and 22B of the lower block main bodies 21A and 21B, and the space between the recesses 31A and 31B is placed on the bottom surfaces 32A and 32B. The filling materials 70A and 70B are arranged.
Instead of the filling materials 60A and 60B, the filling materials 61A and 61B (see FIG. 5), the filling materials 64A and 64B (see FIG. 7) or the filling materials 68A and 68B (see FIG. 9) are arranged. May be good. The same applies to the filling materials 70A and 70B.

Next, as shown in FIGS. 16 and 17, the upper block 40A is installed on the filling materials 60A and 70A. At this time, the lower surface 42A of the upper block main body 41A faces the upper surface 22A of the lower block main body 21A, and the padding material 60A is between the lower surface 42A of the upper block main body 41A and the upper surface 22A of the lower block main body 21A. Put it in. Further, the convex portion 51A of the upper block 40A is fitted into the concave portion 31A of the lower block main body 21A so that the protruding corner 57A of the convex portion 51A of the upper block 40A is fitted into the inner corner 37A of the concave portion 31A of the lower block main body 21A. Fit in. As a result, the first side surface 53A of the convex portion 51A is abutted against the first inner surface 33A of the recess 31A, and the second side surface 54A of the convex portion 51A is abutted against the second inner surface 34A of the recess 31A. Further, by fitting the convex portion 51A into the concave portion 31A, the filling material 70A is sandwiched between the lower surface 52A of the convex portion 51A and the bottom surface 32A of the concave portion 31A.
Similarly, the upper block 40B is installed on the filling materials 60B and 70B.

Next, as shown in FIG. 18, the stigma 4 is constructed on the main bearings 3 and the temporary bearings 10A and 10B by the precast method or the cast-in-place method. At this time, the upper blocks 40A and 40B are fixed to the stigma 4 by the reinforcing bars 59A and 59B, and the stigma 4 is supported by the main bearings 3 and the temporary bearings 10A and 10B. The stigma 4 is a component of the continuous bridge girder and is a portion of the continuous bridge girder located above the substructure 2.

Next, a plurality of tension members 5 are passed through from the upper end of the stigma 4 to the lower structure 2, and the lower end of the tension member 5 is fixed to the lower structure 2. When the tension material 5 is passed through the lower block 20A and the upper block 40A, a through hole is formed in the lower block 20A and the upper block 40A in advance, and the tension material 5 is passed through the through hole. The same applies to the case where the tension material 5 is passed through the lower block 20A and the upper block 40A.
Then, the tension material 5 is tensioned by pulling the tension material 5 with a jack or the like, and the upper end of the tension material 5 is fixed to the upper end of the stigma 4.

Next, the continuous bridge girder is constructed so as to extend in the bridge axis direction by constructing the blocks (components of the continuous bridge girder) in order to extend the blocks (components of the continuous bridge girder) at the ends of the stigma 4 in the bridge axis direction by the overhanging erection method. ..
When the continuous bridge girder is completed, the tension member 5 is removed as shown in FIG. Further, the closing members 80A and 80B are removed, and the filling members 60A, 60B, 70A and 70B are removed. As a result, the vertical load of the continuous bridge girder is transferred from the temporary bearing 10 to the main bearing, and the resistance of the temporary bearings 10A and 10B to shearing is also released. Then, the process after the continuous bridge girder construction process can be carried out.
Next, as shown in FIG. 20, the lower blocks 20A and 20B and the upper blocks 40A and 40B are removed.

<4. Effect>
According to the above embodiment, the following effects can be obtained.

(A) The temporary bearing 10 not only resists compression due to the vertical load of the continuous bridge girder, but also resists shear due to the horizontal load in the directions of arrows α and β. Therefore, it is not necessary to install the H steel that has been installed in the past, and the construction period of the bridge can be shortened.

(B) Since the padding material 60, 70 is sandwiched between the lower block 20 and the upper block 40, there is no chemical or physical bond between the padding material 60, 70 and the block 20, 40. , The packing materials 60 and 70 can be easily removed in a short time. The same applies to the filling materials 61, 64, 68.

(C) Since the filling materials 60 and 70 are made of powder or granular material, the filling materials 60 and 70 can be easily removed in a short time by simply blowing off the filling materials 60 and 70. In particular, since the recess 31 is opened on the side surfaces 25 and 26 of the lower block main body 21, the filling material 70 can be easily removed.

(D) When the packing materials 60 and 70 are removed, the compression resistance of the temporary bearing 10 is released and the shear resistance is also significantly reduced. Therefore, even if the lower block 20 and the upper block 40 are not removed, the process after the construction of the continuous bridge girder can be carried out within a short time from the removal of the padding members 60 and 70.

(E) Since the filling material 61 is made of a round steel rod 62 (see FIG. 5), the filling material 61 can be easily removed only by rolling the round steel rod 62 as shown in FIG. ..

(F) By simply depressurizing the fluid 66 filled in the flexible pipe 65 of the packing material 64 (see FIG. 7) and letting the fluid 66 flow out from the flexible pipe 65, the compression resistance of the temporary bearing 10 can be increased. Shear resistance can be easily released. Therefore, the process after the construction of the continuous bridge girder can be carried out within a short time from the depressurization of the fluid 66.

(G) The filling material 68 made of wood is easy to cut. Therefore, it is easy to remove the filling material 68.

<5. Modification example>
Although the embodiment for carrying out the present invention has been described above, the above-described embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. Further, the present invention can be modified or improved without departing from the spirit thereof, and the present invention also includes an equivalent thereof. The changes from the above embodiments will be described below. The changes described below may be applied in combination as much as possible.

(A) In the above-described embodiment, the recess 31 is opened on the side surfaces 25 and 26 of the lower block main body 21. On the other hand, as shown in FIG. 21, the recess 31 may not open on the side surface 26 of the lower block main body 21, but may open on the side surface 25 of the lower block main body 21. In this case, the third inner surface 36 and the first inner surface 33 facing the second inner surface 34 of the recess 31 are adjacent to each other, the first inner surface 33 and the third inner surface 36 are orthogonal to each other, and the first inner surface 33 and the third inner surface 36 An entrance corner 38 sandwiched between the two is formed. Then, by fitting the convex portion 51 into the concave portion 31 of the lower block main body portion 21, the facing surface (third side surface) 56 of the second side surface 54 of the convex portion 51 is abutted against the third inner surface 36 of the concave portion 31. The protruding corner 58, which is in contact with the surface and is sandwiched between the facing surface 56 and the first side surface 53, fits into the inside corner 38. A horizontal load in a direction in which the third side surface 56 of the convex portion 51 is pressed against the third inner surface 36 of the concave portion 31 (opposite direction of the direction of arrow β in FIG. 1) is also received by the lower block main body portion 21. Therefore, the temporary bearing 10 resists shearing due to its horizontal load.

(B) As shown in FIG. 22, the temporary bearing 10 described above may be turned upside down by rotating it by 180 ° around the horizontal axis. In this case, the "lower block 20" is referred to as the "upper block 20", the "upper block 40" is referred to as the "lower block 40", the "lower block main body 21" is referred to as the "upper block main body 21", and the "lower block main body" is used. The "upper surface 22 of the portion 21" is the "lower surface 22 of the upper block main body 21", the "lower surface of the lower block main body 21" is the "upper surface of the upper block main body 21", and the "lower surface of the flanges 27 and 28" is "lower surface". The "upper surface of the flanges 27 and 28" and the "upper block main body 41" are referred to as the "lower block main body 41", and the "lower surface 42 of the upper block main body 41" is referred to as the "upper surface 42 of the lower block main body 41". The "upper surface 43 of the upper block main body 41" is "the lower surface 43 of the lower block main body 41", the "bottom surface 32 of the concave portion 31" is the "top surface 32 of the concave portion 31", and the "lower surface 52 of the convex portion 51" is " It is referred to as "the upper surface 52 of the convex portion 51". Further, in a state where the upper surfaces of the flanges 27 and 28 and the upper block main body 21 are abutted against the lower surface of the continuous bridge girder, the reinforcing bars 39 are fixed to the concrete of the continuous bridge girder, whereby the upper block main body 21 is fixed to the continuous bridge girder. Will be done. Further, in a state where the lower surface 43 of the lower block main body 41 is abutted against the top end of the lower structure, the reinforcing bar 59 is fixed to the concrete of the lower structure, so that the lower block main body 41 is fixed to the lower structure. Will be done.

(C) In the above-described embodiment, the side surfaces 23 to 26 of the lower block main body 21 form a quadrangular prism surface. On the other hand, the side surface (peripheral surface) of the lower block main body 21 may form a cylindrical surface. In this case, the shapes of the side surfaces 55 and 56 of the convex portion 51 are changed to the arc pillar surface, and the shape of the convex portion 51 is changed to the arc column whose central angle is right angle.

(D) In the above-described embodiment, the concave portion 31 is a rectangular parallelepiped type, and the convex portion 51 is a rectangular parallelepiped type. On the other hand, as shown in FIGS. 23 to 26, the concave portion 31 may have a shape in which the hemisphere is divided into four equal parts, and the convex portion 51 may have a shape in which the hemisphere is divided into four equal parts. Specifically, it is as follows.

By providing the corners of the upper surface 22 of the lower block main body 21 in a state of being cut out in an octagonal shape of a sphere, the inner surface 131 of the concave portion 31 stands so as to be concavely curved from the upper surface 22 of the lower block main body 21. It is lowered, and its inner surface 131 is formed in a concave shape (more specifically, a spherical concave shape). The recess 31 opens not only on the upper surface 22 of the lower block main body 21, but also on the side surface 25 and the side surface 25. The inner surface 131 may be formed in a parabolic or ellipsoidal concave shape.

On the other hand, the side surface 156 facing sideways of the convex portion 51 and the side surface 155 adjacent thereto vertically descend from the lower surface 42 of the upper block main body 41, and the side surface 156 is flush with the end surface 46 of the upper block main body 41. ing. The side surface (outer surface) 151 adjacent to the side surface 156 and the side surface 155 hangs down from the lower surface 42 of the upper block main body 41 so as to be convexly curved, and the side surface 151 is convex (more specifically, spherical). It is formed in a convex shape). The side surface 151 may be formed in a parabolic or ellipsoidal concave shape.

The upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 face each other with a gap between them, and between the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41. The filling material 160 is sandwiched in the space. As a result, the vertical load of the continuous bridge girder is received by the lower block main body 21 via the packing material 160. The filling material 160 is the same as the filling material 60, 61, 64, 68 described above.

In a state where the upper surface 22 of the lower block main body 21 and the lower surface 42 of the upper block main body 41 face each other, the convex portion 51 of the upper block 40 is fitted into the concave portion 31 of the lower block main body 21. The radius of curvature of the side surface 151 of the convex portion 51 is smaller than the radius of curvature of the inner surface 131 of the concave portion 31, and the side surface 151 of the convex portion 51 and the inner surface 131 of the concave portion 31 face each other with a gap between them. The filling material 160 is also sandwiched between the side surface 151 of the convex portion 51 and the inner surface 131 of the concave portion 31. Therefore, the horizontal load in two directions (directions of arrow α and arrow β) of the continuous bridge girder is received by the lower block main body 21 (particularly the inner surface 131) via the filling material 160, and the vertical load of the continuous bridge girder is applied to the filling material. It is received by the lower block main body 21 (particularly the inner surface 131) via 160.

After constructing the continuous bridge girder by the overhanging erection method, when the padding material 160 is removed, the resistance of the temporary bearing 10 to the compression in the vertical direction is released, and the vertical load of the continuous bridge girder is received from the temporary bearing 10 to the main bearing. Can be replaced. Further, the resistance of the temporary bearing 10 to shearing due to the horizontal load in the directions of the arrows α and β is also released.

As in the above embodiment, the two temporary bearings 10 are set as one set, and one temporary bearing 10 and the other temporary bearing 10 are axisymmetric with respect to the vertical axis. Further, as in the case of the modification (b), as shown in FIG. 27, the temporary bearing 10 may be turned upside down by rotating it by 180 ° around the horizontal axis.

2 ... Lower structure, 4 ... Capital (bridge girder), 10 ... Temporary bearing, 20 ... Lower block, 21 ... Lower block main body, 22 ... Upper surface of lower block main body, 23-25 ... Side surface of lower block main body , 31 ... recess, 32 ... bottom surface of recess, 33 ... first inner surface of recess, 34 ... second inner surface of recess, 37 ... inside corner, 40 ... upper block, 41 ... upper block body, 42 ... upper block body Lower surface of the portion, 51 ... Convex portion, 52 ... Lower surface of the convex portion, 53 ... First side surface of the convex portion, 54 ... Second side surface of the convex portion, 60 ... Filling material (first filling material), 61 ... Filling material (first filling material), 62 ... Round steel rod (round bar), 64 ... Filling material (first filling material), 65 ... Flexible pipe, 66 ... Fluid, 68 ... Filling material ( 1st padding material) 70 ... Filling material (2nd padding material), 131 ... Inner surface of recess, 151 ... Side surface (outer surface) of convex part

Claims (10)

A temporary bearing provided between the top of the substructure of the bridge and the underside of the bridge girder.
Equipped with lower block, upper block, first padding and second padding,
The lower block
The lower block main body fixed to the top of the lower structure and
It has a recess recessed in the upper surface of the lower block main body, and has a recess.
The upper block
An upper block main body fixed to the lower surface of the bridge girder and arranged above the lower block main body,
It has a convex portion that is convexly provided on the lower surface of the upper block main body and is fitted into the concave portion.
The first inner surface and the second inner surface of the recess rise from the bottom surface of the recess to the upper surface of the lower block main body, and are adjacent to each other so as to form an inside corner.
The first side surface and the second side surface of the convex portion rise from the lower surface of the convex portion to the lower surface of the upper block main body portion, and are adjacent to each other so as to form a protruding corner.
The first side surface of the convex portion is abutted against the first inner surface of the concave portion, and the second side surface of the convex portion is abutted against the second inner surface of the concave portion.
The first filling material is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body, and the second filling material is sandwiched between the lower surface of the convex portion and the bottom surface of the concave portion. sandwiched,
A temporary bearing characterized in that the recess is opened on the side surface of the lower block main body portion, and the first filling material and the second filling material appear on the side surface of the lower block main body portion. A temporary bearing provided between the top of the substructure of the bridge and the underside of the bridge girder.
Equipped with lower block, upper block and padding
The lower block
The lower block main body fixed to the top of the lower structure and
It has a recess recessed in the upper surface of the lower block main body, and has a recess.
The upper block
An upper block main body fixed to the lower surface of the bridge girder and arranged above the lower block main body,
It has a convex portion that is convexly provided on the lower surface of the upper block main body and is fitted into the concave portion.
The inner surface of the recess is formed into a curved surface by falling from the upper surface of the lower block main body.
The outer surface of the convex portion rises from the lower surface of the upper block main body portion to form a curved surface.
The padding material is sandwiched between the inner surface of the concave portion and the outer surface of the convex portion, and is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body .
The concave portion opens on the side surface of the lower block main body portion, and a portion of the padding material sandwiched between the inner surface of the concave portion and the outer surface of the convex portion appears on the side surface of the lower block main body portion. A temporary portion of the padding material that is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body appears on the side surface of the lower block main body. Bearing. A temporary bearing provided between the top of the substructure of the bridge and the underside of the bridge girder.
Equipped with lower block, upper block, first padding and second padding,
The upper block
The upper block main body fixed to the lower surface of the bridge girder,
It has a recess recessed in the lower surface of the upper block main body, and has a recess.
The lower block
A lower block main body fixed to the top end of the lower structure and arranged below the upper block main body,
It has a convex portion that is convexly provided on the upper surface of the lower block main body and is fitted into the concave portion.
The first inner surface and the second inner surface of the recess descend from the top surface of the recess to the lower surface of the upper block main body, and are adjacent to each other so as to form an inside corner.
The first side surface and the second side surface of the convex portion rise from the upper surface of the convex portion to the upper surface of the lower block main body portion, and are adjacent to each other so as to form a protruding corner.
The first side surface of the convex portion is abutted against the first inner surface of the concave portion, and the second side surface of the convex portion is abutted against the second inner surface of the concave portion.
The first filling material is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body, and the second filling material is sandwiched between the upper surface of the convex portion and the top surface of the concave portion. Is sandwiched,
A temporary bearing characterized in that the recess is opened on the side surface of the upper block main body portion, and the first filling material and the second filling material appear on the side surface of the upper block main body portion. A temporary bearing provided between the top of the substructure of the bridge and the underside of the bridge girder.
Equipped with lower block, upper block and padding
The upper block
The upper block main body fixed to the lower surface of the bridge girder,
It has a recess recessed in the lower surface of the upper block main body, and has a recess.
The lower block
A lower block main body fixed to the top end of the lower structure and arranged below the upper block main body,
It has a convex portion that is convexly provided on the upper surface of the lower block main body and is fitted into the concave portion.
The inner surface of the recess rises from the lower surface of the upper block main body and is formed into a curved surface.
The outer surface of the convex portion rises from the upper surface of the lower block main body portion and is formed in a curved surface shape.
The padding material is sandwiched between the inner surface of the concave portion and the outer surface of the convex portion, and is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body.
The concave portion opens on the side surface of the upper block main body portion, and a portion of the padding material sandwiched between the inner surface of the concave portion and the outer surface of the convex portion appears on the side surface of the upper block main body portion. A temporary portion of the padding material that is sandwiched between the upper surface of the lower block main body and the lower surface of the upper block main body appears on the side surface of the upper block main body. Bearing. The provisional bearing according to claim 1 or 3 , wherein the first filling material and the second filling material are made of powder or granular material. The temporary bearing according to claim 1 or 3 , wherein the first filling material and the second filling material are composed of a plurality of round bars that are laid down and bundled. The first filling material and the second filling material are
With multiple flexible tubes spread out,
The temporary bearing according to claim 1 or 3 , wherein the flexible tube is filled with a fluid in a compressed state. The temporary bearing according to claim 1 or 3 , wherein the first padding material and the second padding material are made of a material softer than the upper block main body portion and the lower block main body portion. The lower through hole is formed so as to protrude from the lower part of the side surface of the lower block main body portion and penetrate the flange provided integrally with the lower block main body portion up and down, and the lower reinforcing bar is passed through the lower through hole. Is fixed to the flange, and the lower reinforcing bar is fixed to the lower structure.
The provisional bearing according to any one of claims 1 to 8, characterized in that. The upper through hole is formed so as to penetrate the upper block main body portion up and down, the upper reinforcing bar is passed through the upper through hole and fixed to the upper block main body portion, and the upper reinforcing bar is fixed to the bridge girder.
The provisional bearing according to any one of claims 1 to 9, characterized in that.

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