Temporary receiving bracket and method of attaching temporary receiving bracket

Abstract

To provide a temporary receiving bracket capable of shortening a fixing work time to a bridge pier of the temporary receiving bracket and preventing reduction in a support load of an anchor bolt by a load from above.SOLUTION: The temporary receiving bracket 1 has a fixing part 11 fixed to the bridge pier 6 by a plurality of anchor bolts 7 projecting from an outer peripheral surface of the bridge pier 6 and corresponding nuts 8, and a support part 12 integrally arranged in the fixing part 11 and supporting the bridge girder 4 via the jack 5. The fixing part 11 has a base plate 13 arranged along an outer peripheral surface of the pier 6. The base plate 13 is provided with a plurality of first through-holes 18 through which the anchor bolts 7 pass and which have a dimension larger than the diameter of the anchor bolts 7. In addition, the fixing portion 11 includes a plurality of shear plates 20 fitted into the first through-holes 18 and a plurality of bending plates 22 disposed in front of the shear plates 20. At least one of the plurality of first through holes 18 has a non-circular shape.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a temporary support bracket that is detachably attached to the outer peripheral surface of a bridge pier to temporarily support a bridge girder, and a method for attaching the temporary support bracket. [Background technology]

[0002] When replacing the bearings of a reinforced concrete bridge pier, it is necessary to support the bridge girder with a jack or the like. When there is not enough space to install a jack on the top surface of the pier, a steel pier edge widening bracket (temporary support bracket) for installing the jack is fixed to the side (outer surface) of the pier (see Patent Document 1). The temporary support bracket is fixed to the pier with multiple anchor bolts that are pre-installed on the outer surface of the pier and multiple nuts that screw onto the anchor bolts. The anchor bolts are arranged in a line in the vertical direction (up and down) and horizontal direction (left and right). The temporary support bracket has multiple through holes formed therein through which the anchor bolts pass.

[0003] The rebar inside the pier may not be positioned as shown in the as-built drawings. As a result, when drilling holes to install anchor bolts, the drilling machine may interfere with the rebar inside the pier before the hole length reaches the anchor bolt's embedded length. In this case, the hole position is shifted and drilling is performed again, which may cause the anchor bolt position to deviate from the designed position. Therefore, the through hole in the temporary support bracket must be formed based on the actual position of the anchor bolt obtained by measurement. In addition, if there is an error in measuring the anchor bolt's position, the anchor bolt may not pass through the through hole in the temporary support bracket, and the through hole's position may need to be changed. As a result, it takes a long time from installing the anchor bolt to fixing the temporary support bracket to the pier. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5770398 [Patent Document 2] Patent No. 4766429 Summary of the Invention [Problem to be solved by the invention]

[0005] The present inventors focused on the bracket described in Patent Document 2 in order to shorten the time required to fix a temporary support bracket to a bridge pier. The mounting hole (through hole) of the bracket described in Patent Document 2 has at least two positioning holes set to a diameter that creates a clearance of about 1 to 2 mm from the shaft diameter of the anchor bolt, and an enlarged hole that is about 30 mm larger in diameter than the shaft diameter of the anchor bolt. Each enlarged hole is circular, and a circular embedded member having an insertion hole corresponding to the diameter of the anchor bolt in an eccentric position is placed in the gap created between the enlarged hole and the anchor bolt that passes through it.

[0006] In the bracket described in Patent Document 2, each enlarged hole is circular, allowing the embedded member to rotate around the center of the corresponding enlarged hole. In addition, some of the anchor bolts are positioned eccentrically from the center of the enlarged hole. Therefore, if the mounting hole configuration described in Patent Document 2 is applied to a bracket that supports a vertical load, there is a risk that the embedded member will rotate around the center of the enlarged hole when a load acts on the bracket from above, and the bracket will no longer be able to support the vertical load.

[0007] In view of the above background, an object of the present invention is to provide a temporary support bracket that can shorten the time required to fix the temporary support bracket to a bridge pier and can prevent the supporting load of the anchor bolt from being reduced due to a load from above. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a temporary support bracket (1) that is detachably attached to the outer peripheral surface of a bridge pier (6) to temporarily support a bridge girder (4), and that includes a fixing portion (11) that is fixed to the pier by a plurality of anchor bolts (7) that protrude from the outer peripheral surface of the pier and a plurality of nuts (8) that screw onto the anchor bolts, and a support portion (12) that is integral with the fixing portion and supports the bridge girder via a jack (5), and the fixing portion includes a base plate (13) that is arranged along the outer peripheral surface of the pier and a support portion (12) through which the anchor bolts pass. the base plate has a plurality of first through holes (18) formed in the base plate with a dimension larger than the diameter of the anchor bolts so that the anchor bolts pass through the first through holes; a shear plate (20) having a plurality of second through holes (21) fitted into the first through holes and through which the corresponding anchor bolts pass; and a plurality of bending plates (22) having a dimension larger than the shear plate and including third through holes (23) through which the corresponding anchor bolts pass, and which are arranged between the corresponding nuts and the shear plate, and at least one of the plurality of first through holes is non-circular.

[0009] According to this embodiment, it is not necessary to form the first through hole in the base plate based on the actual position of the anchor bolt. Even if there is an error in measuring the anchor bolt's position, the anchor bolt can be passed through the second through hole simply by replacing the shear plate. This reduces the time required to fasten the bracket to the pier. Furthermore, the temporary support bracket can be reused simply by replacing the shear plate. Furthermore, the shear plate does not rotate relative to the corresponding first through hole. Therefore, even if the anchor bolt is positioned eccentrically from the center of the first through hole, the supporting load of the anchor bolt is not reduced by a load from above.

[0010] In the above aspect, the portion of the base plate that defines the upper portion of the non-circular first through hole may have a lower surface that extends in the left-right direction.

[0011] According to this embodiment, the shear plate fitted into the non-circular first through hole effectively resists shear force.

[0012] In the above aspect, the non-circular first through hole may be square.

[0013] According to this embodiment, the shear plate fitted into the square first through hole effectively resists shear force.

[0014] In the above aspect, all of the first through holes are rectangular, and the first through holes are arranged in a row at predetermined intervals in the vertical and horizontal directions, and each of the vertical and horizontal dimensions of the first through holes may be equal to or greater than a dimension that can absorb each positional error that occurs when the actual position of the anchor bolt fixed to the pier deviates from the design position, and may be at least twice the diameter of the anchor bolt.

[0015] According to this aspect, when the temporary support bracket is used on another pier, even if the rebar spacing is different, the temporary support bracket can be reused as long as the arrangement of the anchor bolts is similar. This makes it easy to reuse the temporary support bracket.

[0016] In the above aspect, the support portion (14) has a support plate extending horizontally from the upper end of the base plate outward from the outer peripheral surface of the pier, and a plurality of vertical ribs (16) connected to the outer surface of the base plate and the lower surface of the support plate and extending vertically, and the first through hole is preferably positioned between adjacent vertical ribs.

[0017] According to this aspect, interference between the anchor bolt and the longitudinal rib is suppressed.

[0018] In the above aspect, the bent plate may have at least one first fastening hole (28) formed therein, and the base plate may have a second fastening hole (29) formed therein that is aligned with the first fastening hole.

[0019] According to this aspect, the bent plate can be temporarily fixed to the base plate.

[0020] In addition, in order to solve the above-mentioned problems, the present invention provides a method for attaching the above-mentioned temporary support bracket to the outer peripheral surface of the pier, comprising: a first passing step (Fig. 6(B)) of passing the anchor bolt through the first through hole; a hole forming step of forming the second through hole in the shear plate according to the position of the anchor bolt; a second passing step (Fig. 6(C)) of passing the anchor bolt through the second through hole; an arrangement step (Fig. 6(C)) of placing the shear plate in the first through hole; a third passing step (Fig. 6(D)) of passing the anchor bolt through the third through hole; and a fastening step (Fig. 6(E)) of screwing the nut onto the anchor bolt and fastening the shear plate and the base plate to the outer peripheral surface of the pier via the bending plate.

[0021] According to this aspect, the temporary support bracket is detachably attached to the pier.

[0022] In the above aspect, at least one first fastening hole (28) is formed in the bent plate, and a second fastening hole (29) that aligns with the first fastening hole is formed in the base plate, and the installation method preferably includes a temporary fixing step of fastening the overlapping first fastening hole and the second fastening hole with a fastener (31).

[0023] According to this aspect, the bent plate can be temporarily fixed to the base plate, thereby improving the workability of passing the anchor bolts through the respective through holes. [Effects of the Invention]

[0024] The present invention can provide a temporary support bracket that is prevented from being displaced downward due to a load from above. [Brief explanation of the drawings]

[0025] [Figure 1]1 is a side view of a main part of a bridge with a temporary support bracket according to a first embodiment attached to a bridge pier; [Figure 2] Front view of the base plate and support part of the temporary support bracket [Figure 3] A cross-sectional side view of the base plate and support portion of the temporary support bracket [Figure 4] Front view of shear plate [Figure 5] Front view of bending and shear plates [Figure 6] Diagram showing the procedure for attaching temporary support brackets to piers [Figure 7] Front view of temporary support bracket attached to pier [Figure 8] A cross-sectional side view of the temporary support bracket attached to the pier. [Figure 9] A cross-sectional side view showing the main parts of the temporary support bracket attached to the pier. DETAILED DESCRIPTION OF THE INVENTION

[0026] (First embodiment) A temporary support bracket 1 according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the temporary support bracket 1 is used to install a jack 5 for temporarily supporting a bridge girder 4 when replacing a bearing 3 installed on a bridge 2, and is installed at a position aligned with the bearing 3 and the bridge girder 4 in the direction perpendicular to the bridge axis. If the bearings 3 and the bridge girder 4 (main girders) are installed at multiple locations in the direction perpendicular to the bridge axis, the temporary support bracket 1 is also installed at multiple corresponding locations. The temporary support bracket 1 is detachably attached to the outer peripheral surface of the pier 6. Specifically, the temporary support bracket 1 is detachably attached to each of the planes of the pier 6 facing the bridge axis direction. In this embodiment, the planes facing the bridge axis direction extend vertically and perpendicular to the bridge axis. In other embodiments, the planes of the pier 6 facing the bridge axis direction may be inclined with respect to at least one of the vertical direction and the direction perpendicular to the bridge axis.

[0027] The temporary support bracket 1 is attached to the pier 6 by a plurality of anchor bolts 7 (see FIG. 7) protruding from the plane of the pier 6 facing the bridge axis direction, and a plurality of nuts 8 (see FIG. 7) that screw onto these anchor bolts 7. When the bridge girder 4 is jacked up by the jack 5, the load of the bridge girder 4 is transferred from the bearing 3 to the jack 5. This makes it possible to replace the bearing 3. The configuration of the temporary support brackets 1 attached to both planes facing the bridge axis direction of the pier 6 is the same, so in this embodiment, a temporary support bracket 1 attached to one of the planes will be described.

[0028] In the following explanation, the vertical direction on the plane facing the bridge axis direction of the pier 6 to which the temporary support bracket 1 is fixed is defined as the up-down direction, and the horizontal direction on the plane of the pier 6 to which the temporary support bracket 1 is fixed is defined as the left-right direction. Additionally, the direction in which the plane facing the bridge axis direction of the pier 6 to which the temporary support bracket 1 is fixed faces is defined as the front, and the direction opposite to the direction in which the plane facing the bridge axis direction of the pier 6 faces is defined as the rear. The plane facing the bridge axis direction of the pier 6 to which the temporary support bracket 1 is fixed is called the front side.

[0029] As shown in Figures 2 and 3, the temporary support bracket 1 has a fixing portion 11 that is fixed to the front surface of the pier 6 with a plurality of anchor bolts 7 and a corresponding plurality of nuts 8, and a support portion 12 that is integral with the fixing portion 11 and supports the bridge girder 4 via a jack 5. The fixing portion 11 has a base plate 13 that is placed along the front surface of the pier 6. When the temporary support bracket 1 is attached to the front surface of the pier 6, the surface of the base plate 13 faces in the front-to-rear direction. Below, the temporary support bracket 1 will be described based on this attached state. The base plate 13 is formed in a rectangular shape when viewed from the front. The base plate 13 may be formed from a metal such as steel.

[0030] The support portion 12 is provided on the upper part of the base plate 13 and includes a support plate 14 that supports the jack 5, an extension plate 15 that extends from the lower part of the base plate 13, and a plurality of vertically extending longitudinal ribs 16 that connect the support plate 14 and the extension plate 15. The support plate 14 extends horizontally forward from the upper end of the base plate 13. The extension plate 15 extends horizontally forward from the lower end of the base plate 13. The surfaces of the support plate 14 and the extension plate 15 each face vertically. The jack 5 is placed on the upper surface of the support plate 14. The longitudinal ribs 16 are connected to the lower surface of the support plate 14 and the upper surface of the extension plate 15, and are also connected to the front surface of the base plate 13. The support plate 14, the extension plate 15, and the vertical ribs 16 may be joined to the base plate 13 by, for example, welding.

[0031] The support plate 14, the extension plate 15, and the vertical ribs 16 may be formed from the same material as the base plate 13. The vertical ribs 16 may be plate-shaped members with their surfaces facing the left-right direction. The vertical ribs 16 are arranged at intervals from each other in the left-right direction. In another embodiment, the extension plate 15 may not be provided, and the vertical ribs 16 may be connected only to the lower surface of the support plate 14 and the front surface of the base plate 13.

[0032] The base plate 13 is formed with a plurality of first through holes 18 penetrating in the thickness direction. A corresponding anchor bolt 7 passes through each first through hole 18. The first through holes 18 may be formed in a factory so that they are arranged in a row at predetermined intervals in the vertical and horizontal directions based on the arrangement of the anchor bolts 7. In this embodiment, the base plate 13 is formed with a total of 12 first through holes 18 arranged in three rows in the vertical direction and four columns in the horizontal direction. However, the number of first through holes 18 is not limited to this. The first through holes 18 are provided in positions that do not overlap with the vertical ribs 16. Specifically, the first through holes 18 arranged in a row in the vertical direction are arranged between adjacent vertical ribs 16.

[0033] All of the first through holes 18 are non-circular in front view. In this embodiment, the first through holes 18 are square with one side extending in the left-right direction. That is, the portion of the base plate 13 that defines the upper side of the first through hole 18 has a lower surface that extends in the left-right direction.

[0034] The vertical and horizontal dimensions of the first through hole 18 are each larger than the diameter of the anchor bolt 7. The vertical and horizontal dimensions of the first through hole 18 are each large enough to absorb positional errors that occur when the actual position of the anchor bolt 7 fixed to the pier 6 deviates from the designed position, as will be described later. Preferably, the vertical and horizontal dimensions of the first through hole 18 are each at least twice the diameter of the anchor bolt 7. More preferably, the vertical and horizontal dimensions of the first through hole 18 are each at least three times the diameter of the anchor bolt 7. In this embodiment, the vertical and horizontal dimensions of the first through hole 18 are set to 150 mm x 150 mm for an M39 anchor bolt 7 (reference shaft diameter: 36.17 mm), which are each four times the diameter of the anchor bolt 7.

[0035] In another embodiment, first through hole 18 may be a rectangle whose left-right dimension is longer than its up-down dimension. In this case, for example, first through hole 18 may have a left-right dimension that is at least three times the diameter of anchor bolt 7, and a up-down dimension that is at least two times the diameter of anchor bolt 7.

[0036] The fixing portion 11 further includes a plurality of shear plates 20 (see FIG. 4 ) that are fitted into the corresponding first through holes 18 to transmit shear forces. Specifically, the shear plates 20 have an outer contour that corresponds to the shape of the first through holes 18, and are formed in a square shape with their faces facing the front-to-rear direction. More specifically, the dimensions of the shear plates 20 in the up-down direction and the left-to-right direction are approximately 150 mm × 150 mm. The thickness of the shear plates 20 in the front-to-rear direction is approximately equal to the thickness of the base plate 13 in the front-to-rear direction. Therefore, when the shear plates 20 are fitted into the corresponding first through holes 18, the front and rear surfaces of the shear plates 20 are arranged on the same plane as the front and rear surfaces of the base plate 13.

[0037] The shear plate 20 is formed with a second through hole 21 penetrating through the thickness direction. A corresponding anchor bolt 7 passes through the second through hole 21. In this embodiment, the second through hole 21 is circular. The diameter of the second through hole 21 is slightly larger than the diameter of the corresponding anchor bolt 7. As will be described later, the second through hole 21 is formed based on the actual position of the anchor bolt 7 relative to the first through hole 18. Therefore, the center of the second through hole 21 may be offset from the center of the corresponding shear plate 20 or may be aligned with the center of the corresponding shear plate 20.

[0038] As shown in FIG. 5, the fixing portion 11 further includes a plurality of bending plates 22 arranged between the nuts 8 that screw onto the anchor bolts 7 and the shear plate 20. The bending plates 22 are arranged to cover the shear plate 20 from the front. That is, the bending plates 22 are larger than the shear plate 20 and transmit the tightening force of the nuts 8 to the base plate 13 with their bending strength. In this embodiment, the bending plates 22 are square with faces facing the front-rear direction. The dimensions of the bending plates 22 in the up-down direction and the left-right direction are approximately 200 mm × 200 mm.

[0039] A third through hole 23 is formed in the bending plate 22, penetrating it in the thickness direction. A corresponding anchor bolt 7 passes through the third through hole 23. In this embodiment, the third through hole 23 is circular. The diameter of the third through hole 23 is slightly larger than the diameter of the second through hole 21 formed in the shear plate 20 and smaller than the minimum diameter (the width across flats in the case of a hexagonal nut) of the nut 8 that screws onto the anchor bolt 7. The bending plate 22 is disposed in front of the corresponding shear plate 20 so that the centers of the second through hole 21 and the third through hole 23 are aligned with each other. In this case, the upper, lower, left, and right edges of the bending plate 22 are preferably located outward from the corresponding upper, lower, left, and right edges of the shear plate 20 in a front view. The center of the third through hole 23 may be offset from the center of the corresponding bending plate 22 or may be aligned with the center of the corresponding bending plate 22.

[0040] A method for attaching the temporary support bracket 1 configured as above to the bridge pier 6 will now be described.

[0041] As shown in FIG. 6(A), first, a plurality of anchor bolts 7 are fixed to the pier 6. A worker designs positions for drilling a plurality of holes 25 (see FIG. 8) for inserting the anchor bolts 7. Specifically, the worker may mark out positions for drilling the holes 25 on the front surface of the pier 6 to which the temporary support bracket 1 is attached. At this time, the worker may also mark out the installation position of the temporary support bracket 1 or the positions of each first through hole 18. The worker then drills the holes 25 using an appropriate tool such as a drilling machine. In this embodiment, a total of 12 holes 25 are formed, arranged in three vertical rows and four horizontal rows. The length of the holes 25 in the front-to-rear direction from the front surface of the pier 6 to the interior of the pier 6 corresponds to the embedded length of the anchor bolts 7.

[0042] Before the length of hole 25 in the front-to-rear direction reaches the embedded length of anchor bolt 7, the drilling machine and the reinforcing bar (not shown) inside pier 6 may interfere with each other. In this case, the worker shifts the position of hole 25 and drills again. In this case, it is preferable that the drilling position be the inside part of the frame corresponding to first through hole 18. As a result, the position of hole 25 shifts from the originally planned design position.

[0043] The worker fills the holes 25 with a hardening material (not shown), such as an organic adhesive or an inorganic adhesive, and inserts the rear part of the corresponding anchor bolt 7 into the hole 25. As the hardening material hardens, the anchor bolt 7 is fixed to the pier 6. If the position of the hole 25 deviates from the originally planned design position, the actual position of the anchor bolt 7 fixed to the pier 6 will also deviate from the design position.

[0044] Next, the worker measures the actual positions of the anchor bolts 7. Using a measuring instrument such as a tape measure, the worker may measure, for example, the center position of the anchor bolt 7 that is actually placed relative to the marked installation position of the temporary receiving bracket 1 or a frame that corresponds to the position of each first through hole 18. Alternatively, the worker may use a camera or the like to photograph the state of the anchor bolt 7 that is actually placed, and use a predetermined computer application to measure the center position of the anchor bolt 7 that is actually placed based on the photographed image.

[0045] Next, the worker forms the second through hole 21 in the shear plate 20 (hole forming step). For example, the worker determines the actual center position of the anchor bolt 7 obtained by measurement of the shear plate 20, and forms the second through hole 21 centered on that position in the shear plate 20. The second through hole 21 may be formed on-site or in a factory.

[0046] As shown in FIG. 6(B), next, the base plate 13 is placed on the front surface of the pier 6. Specifically, the worker passes the front portions of the multiple anchor bolts 7 through the corresponding first through holes 18 from behind (first passing step). Thereafter, the worker moves the base plate 13 toward the front surface of the pier 6, and abuts the rear surface of the base plate 13 against the front surface of the pier 6. The first through holes 18, which are arranged side by side in the vertical direction, are positioned between adjacent vertical ribs 16, so interference between the anchor bolts 7 and the vertical ribs 16 is suppressed.

[0047] As shown in FIG. 6(C), next, the shear plate 20 is placed in the corresponding first through holes 18. Specifically, the worker passes the front portions of the multiple anchor bolts 7 through the corresponding second through holes 21 from the rear (second passing step). Then, the worker moves the shear plate 20 toward the front of the pier 6 and fits the shear plate 20 into the corresponding first through holes 18 (placement step). At this time, the rear surface of the shear plate 20 abuts against the front surface of the pier 6. Because the shear plate 20 is square, it does not rotate with respect to the corresponding first through holes 18. Furthermore, the shear plate 20 transmits the vertical load acting on the temporary support bracket 1 to the corresponding anchor bolt 7 as a shear force. The downward surface of the base plate 13, which defines the upper edge of the first through hole 18, extends in the left-right direction, and the upper surface of the shear plate 20 also extends in the left-right direction. This allows the shear plate 20 to effectively resist vertical shear forces.

[0048] As shown in FIG. 6(D), next, the bending plate 22 is placed in front of the corresponding shear plate 20. Specifically, the worker passes the front portions of the multiple anchor bolts 7 through the corresponding third through holes 23 from behind (third passing step). Thereafter, the worker moves the bending plate 22 toward the front surface of the pier 6, and abuts the rear surface of the bending plate 22 against the front surface of the base plate 13 or the front surface of the shear plate 20.

[0049] At this time, if the rear surfaces of the bent plates 22 do not abut against the front surfaces of the base plate 13 or the shear plate 20, for example, due to overlapping of portions of the bent plates 22 adjacent to each other in the vertical direction, the worker may adjust the position of the bent plates 22. In this case, the worker may, for example, rotate the bent plates 22 around the central axes of the corresponding anchor bolts 7. Alternatively, the worker may place a bent plate 22 in which a third through hole 23 has been newly formed on site in front of the shear plate 20. In this case, the worker may prepare a bent plate 22 in which the third through hole 23 is not formed.

[0050] Next, as shown in Figure 6(E), the worker screws the nut 8 onto the front part of the anchor bolt 7. By screwing the anchor bolt 7 and the nut 8 together, the corresponding shear plate 20 and base plate 13 are fastened to the front surface of the pier 6 via the bending plate 22, as shown in Figures 7 and 8 (fastening step). In this way, the temporary support bracket 1 is attached to the front surface of the pier 6.

[0051] The bending plates 22 support the corresponding shear plates 20 and base plates 13 toward the front surface of the pier 6. This causes the shear plates 20 and base plates 13 to be joined to the front surface of the pier 6. Furthermore, when the temporary support bracket 1 receives a vertical load and generates a rotation moment centered on the lower end of the joint surface, the bending plates 22 transmit the tensile force resulting from the rotation moment to the corresponding anchor bolt 7.

[0052] In other embodiments, the base plate 13 may not be placed on the front surface of the pier 6 after the second through holes 21 have been formed in all of the shear plates 20. First, the worker may form the second through holes 21 in the shear plate 20 to be fitted into the upper-leftmost first through hole 18 and the shear plate 20 to be fitted into the lower-rightmost first through hole 18, for example. Next, the worker may place the base plate 13 on the front surface of the pier 6, and then place the two shear plates 20 that previously had second through holes 21 formed in them into the corresponding first through holes 18. Next, the worker may place the bending plate 22 in front of the shear plate 20 and screw the nut 8 onto the front of the anchor bolt 7. This attaches the temporary support bracket 1 to the front surface of the pier 6. Then, the worker may sequentially form the second through holes 21, place the shear plate 20 and the bending plate 22, and screw the anchor bolt 7 into the nut 8 for the remaining first through holes 18 in which the shear plate 20 is not placed.

[0053] After the bearing 3 of the bridge 2 has been replaced, the worker can remove the temporary support bracket 1 from the pier 6 by unscrewing each nut 8 from the anchor bolt 7 .

[0054] When the jack 5 temporarily supports the bridge girder 4, the load of the bridge girder 4 and the load of the jack 5 act from above on the temporary support bracket 1. Because the shear plate 20 does not rotate with respect to the corresponding first through hole 18, even if the anchor bolt 7 is placed in a position eccentric to the center of the first through hole 18, the support load of the anchor bolt 7 is not reduced by the load from above.

[0055] Because the dimensions of all of the first through holes 18 are larger than the diameter of the anchor bolts 7, even if the position of the anchor bolt 7 deviates from the designed position, the worker can pass the anchor bolt 7 through the first through hole 18. Once the anchor bolt 7 passes through the corresponding first through hole 18, even if there is an error in measuring the position of the anchor bolt 7, the anchor bolt 7 can pass through the second through hole 21 simply by replacing the shear plate 20. This eliminates the need to form the first through holes 18 in the base plate 13 based on the actual position of the anchor bolt 7. This reduces the time required from installing the anchor bolt 7 to fixing the temporary support bracket 1 to the pier 6. In addition, the temporary support bracket 1 can be used repeatedly simply by replacing the shear plate 20.

[0056] When using the temporary support bracket 1 on another pier 6, even if the rebar spacing inside the pier 6 is different, as long as the arrangement of the anchor bolts 7 is similar, the temporary support bracket 1 can be used simply by replacing the shear plate 20. In other words, the temporary support bracket 1 can be reused. This makes it easy to reuse the temporary support bracket 1 repeatedly.

[0057] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Fig. 9. Elements that are the same as or similar to those in the first embodiment are given the same reference numerals, and duplicated descriptions will be omitted.

[0058] The bent plate 22 is fixed to the base plate 13. Specifically, at least one first fastening hole 28 that is open in the front-to-rear direction is formed in the bent plate 22, and a second fastening hole 29 that aligns with the first fastening hole 28 is formed in the base plate 13. An internal thread is formed in the inner circumferential surface of the second fastening hole 29. In this embodiment, the first fastening holes 28 are formed in the upper and lower parts of the bent plate 22. The position at which the first fastening hole 28 is formed is not particularly limited. The bent plate 22 and the base plate 13 are fastened together by a fastener. In this embodiment, the fastener is a bolt 31 that screws into an internal thread formed in the inner circumferential surface of the second fastening hole 29.

[0059] In the installation method for attaching the temporary support bracket 1 to the pier 6, first, a worker forms second through holes 21 in the shear plate 20 based on the positions of the anchor bolts 7 that are actually placed. Next, the worker places the shear plate 20 in the corresponding first through holes 18. At this time, the shear plate 20 may be temporarily fixed to the base plate 13 by spot welding, bolts, or the like. Next, the worker places the bending plate 22 in front of the shear plate 20 so that the second through holes 21 and the third through holes 23 are aligned.

[0060] Next, the bent plate 22 is temporarily fixed to the base plate 13 (temporary fixing step). Specifically, the worker first forms second fastening holes 29 in the portions of the base plate 13 that align with the first fastening holes 28 of the bent plate 22. After that, the worker passes the bolts 31 through the first fastening holes 28, and then screws the bolts 31 into the female threads of the second fastening holes 29. In this way, the worker temporarily fixes the bent plate 22 to the base plate 13. In this way, the temporary support bracket 1 is assembled.

[0061] After the temporary support bracket 1 is assembled, the worker passes the anchor bolts 7 through the corresponding through holes 18, 21, and 23 and moves the temporary support bracket 1 toward the front of the pier 6. After moving the temporary support bracket 1 toward the front of the pier 6 to a predetermined position, the worker releases the bolts 31 from the female threads to release the temporary fixation of the bent plate 22 to the base plate 13. The worker then moves the temporary support bracket 1 further toward the front of the pier 6 and abuts the rear surfaces of the base plate 13 and the shear plate 20 against the front of the pier 6. The worker then attaches the temporary support bracket 1 to the pier 6 by screwing nuts 8 onto the front portions of the anchor bolts 7. Temporarily fixing the bent plate 22 to the base plate 13 makes it easier to pass the anchor bolts 7 through the corresponding through holes 18, 21, and 23. This improves the workability of passing the anchor bolts 7 through the corresponding through holes 18, 21, and 23.

[0062] Although the specific embodiments have been described above, the present invention is not limited to the above-described embodiments and modifications and can be implemented in a wide variety of ways. For example, in the above-described embodiments, the first through hole 18 and the shear plate 20 are square, but they may be trapezoidal or oval with a long horizontal axis. The dimensions of the third through hole 23 are generally larger than the dimensions of the second through hole 21. However, the dimensions of the second through hole 21 may be larger than the dimensions of the third through hole 23 as long as the anchor bolt 7 can pass through them. In the second embodiment, the shear plate 20 is temporarily fixed to the base plate 13, but the shear plate 20 may be temporarily fixed to the bending plate 22. Furthermore, the specific configuration, arrangement, quantity, materials, and installation procedure of each component and part may be appropriately changed without departing from the spirit and scope of the present invention. Furthermore, not all of the components shown in the above-described embodiments are necessarily required and may be selected as appropriate. [Explanation of symbols]

[0063] 1: Temporary bracket 5: Jack 4: Bridge girder 6: Pier 7: Anchor bolt 8: Nut 11:Fixed part 12: Support part 13: Base plate 14: Support plate 16: Vertical rib 18: First through hole 20: Shear plate 21: Second through hole 22: Bent plate 23: Third through hole 28: 1st fastening hole 29:Second fastening hole 31: Bolt (fastener)

Claims

1. A temporary support bracket that is detachably attached to the outer peripheral surface of a bridge pier to temporarily support a bridge girder, a fixing portion fixed to the pier by a plurality of anchor bolts protruding from the outer peripheral surface of the pier and a plurality of nuts screwed onto the anchor bolts; A support part that is integrally provided with the fixing part and supports the bridge girder via a jack, The fixing portion is A base plate disposed along the outer peripheral surface of the pier; a plurality of first through holes provided in the base plate with a dimension larger than a diameter of the anchor bolts so that the anchor bolts can pass through; a shear plate including a plurality of second through holes fitted into the first through holes and through which corresponding anchor bolts pass; a plurality of bending plates including third through holes through which the corresponding anchor bolts pass, the bending plates being disposed between the corresponding nuts and the shear plates and having dimensions larger than the shear plates; A temporary support bracket, wherein at least one of the plurality of first through holes is non-circular.

2. The temporary support bracket according to claim 1 , wherein a portion of the base plate that defines an upper portion of the non-circular first through hole has a lower surface that extends in the left-right direction.

3. The temporary support bracket according to claim 2 , wherein the non-circular first through hole is rectangular.

4. All of the first through holes have the rectangular shape, The first through holes are arranged side by side at predetermined intervals in the up-down direction and the left-right direction, The temporary support bracket according to claim 3 , wherein each of the vertical dimension and the horizontal dimension of the first through hole is at least twice the diameter of the anchor bolt.

5. The support portion is A support plate extending horizontally outward from the upper end of the base plate toward the outer periphery of the pier; a plurality of vertical ribs connected to an outer surface of the base plate and a lower surface of the support plate and extending vertically; The temporary support bracket according to claim 1 or 4, wherein the first through-holes are disposed between the adjacent longitudinal ribs.

6. At least one first fastening hole is formed in the bending plate; The temporary bracket according to claim 1 , wherein the base plate has second fastening holes aligned with the first fastening holes.

7. A method for attaching the temporary support bracket according to claim 1 to the outer peripheral surface of the bridge pier, comprising: a first passing step of passing the anchor bolt through the first through hole; a hole forming step of forming the second through hole in the shear plate according to the position of the anchor bolt; a second passing step of passing the anchor bolt through the second through hole; placing the shear plate in the first through hole; a third passing step of passing the anchor bolt through the third through hole; a fastening step of screwing the nut onto the anchor bolt and fastening the shear plate and the base plate to the outer peripheral surface of the pier via the bending plate.

8. At least one first fastening hole is formed in the bending plate; The base plate is formed with a second fastening hole aligned with the first fastening hole, The method for attaching a temporary support bracket according to claim 7, further comprising a temporary fixing step of fastening the overlapping first fastening holes and the overlapping second fastening holes with a fastener.

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