JPH051403A - Repair method for movable part of bridge support - Google Patents

Abstract

PURPOSE:To enable a bridge to be repaired at low cost and in a short time by improving a repair method for a bridge roller support section, and further enable a proper maintenance work to be facilitated whenever necessary, and extend the lifetime of a bridge by eliminating such a large-scale work as seen during a repair work under a traffic restriction, and ensuring a low-cost and short-time work. CONSTITUTION:A repair member 21 comprising the combination of rollers 22 smaller in diameter and harder than existing rollers, and upper and lower bearing plates 23 and 34 for the rollers 22, is housed in gap occupied by the existing rollers for replacement. In addition, the upper and lower bearing plates 23 and 24 are respectively bonded to an existing adjacent lower chute 4 and bottom plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a roller bearing which constitutes a movable part of a bridge bearing.

[0002]

2. Description of the Related Art In support structures for supporting bridge girders, a structure that takes into consideration maintenance and parts replacement has been adopted for the first time in recent years, but most existing bridges have no such consideration. Due to the traditional structure, repairing bearings requires a large amount of money and time.

The structure of the bearing will be described with reference to FIGS. 7 and 8 by taking a conventional roller bearing for a concrete bridge girder as an example. The bearing 1 is mounted between the pier 9 and the bridge girder 10 by the anchor bar 7 and the anchor bolt 8. In this bearing 1, a pin 5 is arranged between an upper shoe 6 and a lower shoe 4, and a plurality of rollers 2 are provided between the lower shoe 4 and a bottom plate 3.
It is composed of a roller bearing structure that has been inserted, and has the function of eliminating movement and rotation in one direction.

Since the bridge girder expands and contracts due to temperature changes, concrete drying, creep phenomenon, etc., the horizontal relative position moves between the bridge pier 9 and the bridge girder 10 as shown by the arrow in FIG. It is a major feature that this escape is taken by rolling.

However, if the roller 2 rusts or foreign matter is caught, the roller 2 does not move, and the important function as a roller bearing for releasing expansion and contraction of the bridge is lost. In order to repair this, not only the roller 2 but also the lower shoe 4, which is the rolling surface of the roller 2, and the bottom plate 3 are rusted or damaged to some extent, and the rolling surface has irregularities, so these must be replaced at the same time. In many cases When the lower shoe 4 and the bottom plate 3 are replaced, the pin 5, the anchor bar 7, and the screw portion of the anchor bolt 8 are further rusted, so replacement or repair of these parts is also added, which leads to a large-scale repair. Therefore, it is difficult to perform proper maintenance in a timely manner, and at present the life of bridges is shortened.

[0006]

SUMMARY OF THE INVENTION The present invention provides a method for repairing a roller bearing that does not require a large amount of cost and time, even for a bridge having a conventional structure, and enables a situation in which appropriate maintenance can be performed in a timely manner. The purpose is to eliminate the large-scale construction, which is carried out under traffic regulation, which is seen during conventional repairs.

[0007]

[Means for solving the problem] A high hardness roller having a diameter smaller than that of an existing roller is integrally sandwiched between upper and lower bearing plates in a space formed after removing a roller of a movable portion of a bridge bearing requiring repair. In addition to accommodating the repaired parts, a gap is provided between the lower shoe and the upper bearing plate and between the bottom plate and the lower bearing plate, and epoxy resin adhesive is injected and fixed in the gaps to repair the movable part of the bridge bearing. The above problems are solved.

[0008]

In the space occupied by the roller requiring repair, the lower shoe or the lower shoe can be accommodated by accommodating and replacing a repair member in which a roller having a diameter smaller than that of the conventional roller and having high hardness and the roller are sandwiched between the upper and lower bearing plates. Even if the surface of the bottom plate is rusted or has some irregularities on the rolling surface due to some damage, the lower shoe or the surface of the bottom plate is not a rolling surface, so it is possible to repair the roller bearing without replacing them. .

[0009]

[Embodiment] No deformation or drop-off of parts at the corners of the bridge support,
The repairing method of the present invention when the roller is simply unable to move will be described with reference to FIGS. 1 to 4. FIGS. 1 and 2 are cross-sectional views showing the situation of the bearing completed by the repairing method of the present invention. 3 and 4 are diagrams showing a repairing procedure.

As shown in FIG. 3, a hydraulic jack 11 and a sandle (base) 12 are inserted between the bridge pier 9 and the bridge girder 10, the bridge girder is lifted by about 3 to 5 mm, and the roller 2 requiring repair is removed. Return to height and temporarily fix. Then, as a pretreatment for resin adhesion in a later step, after the flat surfaces of the lower shoe 4 and the bottom plate 3 are scraped off, a roller 22 having a diameter smaller than that of the existing roller 2 and having a high hardness, and the upper and lower sides of the roller 22. Repair member 21 composed of pressure bearing plates 23 and 24
To store.

The above-mentioned high hardness roller 22 is more than the conventional roller 2 (generally a roller not heat treated),
It is a heat-treated high hardness roller that withstands about 4 times the allowable bearing stress and has about 13 times the strength. The allowable bearing stress based on Hertz's theory for ordinary rollers is 6.000 kg / cm
2 for high hardness roller is 21.500kg / cm
2 and the strength is proportional to the square of the allowable bearing stress, the strength of the high hardness roller is 12.
8 times. (Refer to the Road Bridge Support Handbook issued by the Japan Road Association)

Therefore, even if the roller 22 having a small diameter is used, the weight of the bridge can be sufficiently supported.
In the space H occupied by the old roller 2, a means for accommodating and replacing the repair member 26, which is a combination of the high hardness roller 22 thinner than the old roller and the upper and lower bearing plates 23, 24 of the roller, becomes possible. 4. Even if the surface of the bottom plate 3 is rusted or damaged in some way, this surface is not a roller rolling surface, and therefore the roller bearing can be repaired without replacing them.

As shown in FIG. 4, which is an enlarged detailed view of the portion A of FIG. 1, in which the repair member 21 is housed in the space H formed by removing the old roller, the pressure plate 23 is pushed by the push screws 13, 13a. 24, lower shoe 4, gap 1 formed by bottom plate 3
4. Adjust 14a. (For example, the height of the repair member 21 is designed so that the gaps 14 and 14a are 2 to 3 mm.) After that, the peripheries of the bearing plates 23 and 24 are sealed 15 and 15a). The upper and lower pressure plates 23 and 24 are provided with pipes 16 and 16a which serve as resin injection and air bleeding at several places,
From here, inject the epoxy resin adhesive 19, 19a,
After resin hardening, push screws 13, 13a, hydraulic jack 11,
Sandle 12 is removed and repair is completed.

Next, referring to FIGS. 5 and 6, an example of repairing when the existing bottom plate 3 of the bearing and the concrete pedestal 17 on the bridge pier is damaged will be described. FIG. 5 and FIG. 6 show the situation after repairing. As shown in the figure, the existing roller 2 is removed by the same procedure as in the above-mentioned embodiment, the concrete of the gear seat 17 is chipped off, the anchor bolt 8 is cut if necessary, and the bottom plate 3 is removed.

Next, a repair member 21 consisting of a roller 22 having a diameter smaller than the diameter of the existing roller 2 and having a high hardness and upper and lower pressure bearing plates 23 and 24 for sandwiching the roller is attached to the roller 2.
Is placed in the space H formed after the removal, but the lower bearing plate 24a in which the lower bearing plate 24 is integrally formed with the new bottom plate 3a is used. In the figure, 20 is a side block.

After the repair member 21 is installed, when the anchor bolt 8 is cut, it is restored by welding 18 and the mortar 17 for hammering is placed. Existing lower shoe and new upper bearing plate 2
3 is adhesively fixed by the same method as described above.

[0017]

According to the present invention, the repair of the bridge bearing is simplified, and the repair is completed at low cost and in a short time. Therefore, it is not necessary to carry out a large-scale construction that is performed under the traffic regulation that is seen in the conventional repair time. Up until now, large-scale repairs were required, so it was difficult to perform proper maintenance in a timely manner. Therefore, if the bearing roller rusts or bites foreign matter, the roller does not move, eventually cracks occur in the bridge girder, and it adversely affects the pier, and the life of the bridge can be shortened. .

[Brief description of drawings]

FIG. 1 is a sectional front view of a bearing that has been repaired by a repairing method of the present invention.

FIG. 2 is a sectional side view of a bearing that has been repaired by the repairing method of the present invention.

FIG. 3 is a diagram showing a procedure of a method of the present invention.

FIG. 4 is an enlarged detailed view of part A of FIG.

FIG. 5 is a sectional front view of a bearing repaired by another embodiment.

FIG. 6 is a sectional side view of a bearing repaired according to another embodiment.

FIG. 7 is a sectional front view of the structure of a conventional bearing.

FIG. 8 is a sectional side view of a conventional bearing structure.

[Explanation of symbols]

1 support 2 Existing roller 3 bottom plate 4 Lower shoe 5 pin 6 Upper shoe 7 anchor bar 8 anchor bolts 9 piers 10 bridge girders 11 hydraulic jack 12 Sanders (pedestal) 13, 13a Push screw 14, 14a gap 15,15a seal 16, 16a pipe 17 Scorpio 18 Weld 19, 19a Epoxy resin adhesive 20 side blocks 21 Repair parts 22 High hardness roller 23 Upper bearing plate 24 Lower bearing plate 25 Connecting plate between lower bearing plate and bottom H space

Claims (2)

[Claims] 1. Repair of a movable part of a bridge support having a structure in which a pin is arranged between an upper shoe and a lower shoe, and a plurality of rollers are inserted between the lower shoe and a bottom plate in repairing the movable part of the movable part. In the space formed by removing the roller, a repair member in which the roller is integrally sandwiched by the upper and lower bearing plates is housed, and a gap is provided between the lower shoe and the upper bearing plate and between the bottom plate and the lower bearing plate, A method for repairing a movable part of a bridge bearing, wherein an epoxy resin adhesive is injected and fixed in the gap. 2. The method for repairing a movable part of a bridge bearing according to claim 1, wherein the roller of the repair member is a high hardness roller having a diameter smaller than that of the removed existing roller.