JPH10252016A - Method for replacing bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for performing the work of replacing a bearing device by safely installing a temporary support member with good operating efficiency in a small space between the upper end of a bridge pier and the lower surface of a bridge girder. SOLUTION: A method for replacing a bearing device, in a bearing structure in which an upper structure is borne by the bearing device installed on the upper surface of a lower structure, includes floating the upper structure from the bearing device 5 using a temporary support jack 16, shifting the load reaction of the upper structure to the temporary bearing member 17 from the temporary support jack 16 using the temporary bearing member 17 to perform the work of replacing the old bearing device 5 with a new one, and dismantling the temporary bearing member 17 in a subsequent working process. In that case, the upper structure floated from the bearing device 17 by the temporary support jack 16 is pierced with an inlet vertically penetrating it, and a fluid filler that hardens with the lapse of time, injected through the inlet from above, is extracted toward the outer surface of the lower structure and is hardened into a block shape as a temporary bearing member 17, which is dismantled after the work of replacing the old bearing device 5 with a new one is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a fixed bearing device such as a metal shoe and a rubber shoe in various structures such as a continuous box girder bridge.

[0002]

2. Description of the Related Art In a continuous box girder bridge or the like, a bridge girder is generally supported on a pier through a fixed bearing device such as a metal shoe or a rubber shoe, but the fixed bearing device has reached the end of its useful life. In case or lessons learned from the recent Great Hanshin-Awaji Earthquake, in preparation for a future large earthquake, replace metal shoes with rubber shoes,
Replacement of bearings is being carried out on bridges nationwide, such as replacing old rubber shoes with new rubber shoes, and this replacement work is expected to increase in the future.

A shoe for supporting a bridge girder (hereinafter referred to as a bearing device)
When replacing the bridge, usually lift the bridge girder using a temporary receiving jack and float it from the bearing device, temporarily hold it in this state, and fix the bearing device fixedly installed between the upper end surface of the pier and the lower surface of the bridge girder. After detaching from the upper end surface of the pier and the lower surface of the bridge girder and removing it, fix the new bearing device in place and fix it to the upper end surface of the pier and the lower surface of the bridge girder again to replace the bearing device. Complete.

[0004]

When replacing a bearing device on a pier, it takes a long time of several months until the old bearing device is disassembled and removed and the installation and fixing of the new bearing device are completed. However, it is impossible to lift and support hundreds of tons of bridge girders with temporary jacks for a long time. For this reason, usually, once the bridge girder is lifted by the jack and floated from the bearing device, the temporary receiving members such as square members and blocks are squeezed on the upper surface of the pier and the lower surface of the bridge girder, and between the temporary receiving jack and the temporary receiving member. The bridge girder load is changed and the temporary receiving jack is removed.

[0005] However, a temporary receiving member such as a square member or a block which is relatively heavy and is not easy to handle is attached to the upper end of the pier,
It is a difficult task to carry into a narrow space located under the bridge girder, and there is also a problem with safety. Further, there is a problem that the construction period is prolonged and construction costs are increased.

An object of the present invention is to provide a method of replacing a bearing device which solves the above-mentioned problems.

[0007]

According to the present invention, there is provided a bearing structure for supporting an upper structure such as a bridge girder by a bearing device installed on an upper surface of a lower structure such as a pier. After the object is lifted from the bearing device by the temporary receiving jack, the load reaction force of the upper structure is transferred from the temporary receiving jack to the temporary supporting member, and the old and new bearing devices are exchanged. In the method of replacing a bearing device for removing a member, an injection hole is formed in the upper structure floated from the bearing device by the temporary receiving jack so as to penetrate the upper structure in a vertical direction. The filling material is poured into the surrounding formwork installed on the upper surface of the lower structure, formed into a block shape and hardened to form a temporary bearing member, and after the replacement work of the old and new bearing devices is completed, the temporary bearing member is dismantled and removed. And wherein the door. Further, the present invention is the box girder, wherein the upper structure has an upper slab and a lower slab, and has a fulcrum upper partition between upper and lower slabs, and a partition on both sides provided therebetween. Is provided so as to penetrate the lower slab, and a temporary bearing member formed of the time-hardening fluid filling material filled through the injection hole is provided at a lower position of the partition walls on both sides.

According to the present invention, when replacing the bearing device in a structure in which the upper structure is supported by the bearing device installed on the upper surface of the lower structure, from above the injection hole vertically penetrating the upper structure. The poured hardening fluid filler is poured into the surrounding formwork installed on the upper surface of the lower structure, formed into a block shape and hardened to construct a temporary bearing member of the upper structure, and after the replacement work of the old and new bearing devices is completed Since the temporary bearing member is dismantled and removed, the temporary bearing member is constructed by a simple operation in a narrow space between the upper surface of the lower structure where the bearing device is installed and the lower surface of the upper structure. it can. Further, when the upper structure is a box girder having upper and lower slabs joined by partition walls, the lower slab of the box girder is specially reinforced with a reinforcing bar or the like by installing the temporary bearing member below the partition wall. There is no need to perform this, and workability is further improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall view of a continuous box girder bridge as a specific example of a structure supported by a bearing device (a shoe). For example, a plurality of piers are provided at fixed intervals on the ground 1 such as a river. An abutment 2 and an abutment 3 are erected, and a bridge girder (bridge girder) 6 is supported by a bearing device 5 such as a metal shoe or a rubber shoe installed on the pier 2 and the upper part 4 of the abutment 3.

FIG. 2 is an enlarged sectional detail view of a portion A in FIG.
2 is a vertical cross-sectional view of the center part of FIG. 2, and FIG. 4 is an explanatory plan view of the pier shown in FIG.

FIGS. 2 to 11 show work steps for dismantling and removing the existing support device 5, and FIGS. 12 to 15 show work steps for installing a new support device 5a.

In FIG. 2 to FIG. 3 shown as a first working process of disassembly of the bearing device, one or a plurality of bearing devices 5 such as rubber shoes and metal shoes are installed on the upper surface 7 of the pier upper part 4 which is a lower structure. The lower surface is fixed to the pier upper part 4 by a lower anchor bolt 8 buried in the pier upper part 4.

On the other hand, a box girder (bridge girder) 6 having a road 9 provided on the upper surface thereof is supported on the pier upper part 4 via the bearing device 5. That is, the lower surface 12 of the lower flange 11 of the box girder 6 is fixed to the upper portion of the bearing device 5 using an anchor bolt (not shown). As shown in FIG. 2, a fulcrum upper partition wall 13 and both side partition walls 14, 14 are provided between the upper slab 10 and the lower slab 11 of the box girder 6 at a position immediately above the bearing device 5 and at both side positions thereof. .

The old bearing device 5 in the bridge girder bearing structure described above.
As a first work step of the replacement work, the uneven ground adjustment work for removing the concrete jack receiving portion 15 of the box girder lower surface 12 and the pier upper surface 7 provided when the old bearing device 5 is installed is performed. In this work, a ladder (not shown) temporarily provided by the operator between the road 9 on the upper surface of the box girder 6 and the upper surface 7 of the pier.
Work on this pier upper surface 7 while climbing and descending. A work scaffold is provided around the pier upper part 4 (not shown).

FIG. 5 shows a second operation step.
Here, the temporary receiving jacks (850t) 16 are set on both sides of the existing bearing device 5, the bolts of the bearing device 5 are checked for looseness, and the temporary receiving jack 16 is actuated to receive the bearing device 5. The load reaction force from the box girder 6 is transferred to the temporary receiving jack 16.

FIG. 6 shows a third operation step.
Here, the load reaction force from the box girder 6 is applied to the temporary receiving jack 16.
The temporary support member 17 is constructed in order to transfer from the temporary receiving jack 16 to the temporary support member 17 in a state where the temporary support member 17 is supported.

The method of constructing the temporary bearing member 17 is the main element of the present invention, and is performed by the method shown in FIG. In FIG. 7, a plurality of injection holes 18 are opened through the upper and lower surfaces of the lower slab 11 of the box girder 6. The upper end of each injection hole 18 is located close to the lower part of both side walls 14, 14 and the upper surface 2 of lower slab 11
It is open to 2. The lower end of the injection hole 18 opens on both sides of the existing bearing device 5 on both sides of the temporary receiving jack 16.

Further, the upper surface 7 of the pier and the lower surface 1 of the lower slab of the box girder 6 are so arranged that the injection hole 18 is located at the upper open portion of the surrounding formwork.
2 and form an enclosing formwork 20 in a plane rectangle. (FIG. 7
In this case, the enclosing form 20 is provided so as to be directly below each of the partition walls 14, 14, respectively.

Subsequently, as shown in FIG. 7 (A), as an example of a time-curable fluid filler, a non-shrink mortar 21 is inserted from the upper surface 22 of the lower slab through the injection hole 18 into the inside of the flat rectangular enclosure form 20. Inject and lower lower slab 12 of box girder 6
Fill until it reaches. After the non-shrink mortar 21 thus filled is dried and hardened with the lapse of time, the mold 2
By releasing the 0, the block-shaped temporary bearing member 17 is constructed on the upper surface of the pier upper surface 7 and directly below each of the partition walls 14, 14. Thereafter, the injection hole 18 is sealed by an appropriate means.

FIG. 8 shows a fourth operation step.
In this work process, after the temporary bearing member 17 is constructed, the temporary receiving jack 16 is contracted and removed, so that the load reaction force of the box girder 6 received by the temporary receiving jack 16 is applied to the temporary bearing member 17. Migrate.

FIG. 9 shows a fifth operation step.
In this work process, the load of the box girder 6 is received by the temporary support member 17, and the upper and lower portions (upper and lower shoes) of the existing support device 5 are separated by a wire saw, and further cut into small portions and carried out. Remove it.

FIG. 10 shows a sixth operation step. In this work process, on the pier upper surface 7, the anchor portion and the lower anchor bolt 8 are removed, and the area shown as the file position 24 is set up to the anchor bolt installation portion for the newly installed bearing device. In addition, irregularity adjustment of an anchor cutting portion 25 (shown in FIG. 9) at the upper part of the bearing device on the lower slab lower surface 12 of the box girder 6 is performed. Thus, the removal of the existing bearing device 5 is completed.

Further, FIG. 10 shows the last operation step of assembling the newly installed bearing device. First, the upper anchor bolt 27 is inserted into the anchor bolt insertion hole 26 through the lower slab 11 of the box girder 6. Stop the upper part with an anchor nut.

FIGS. 11 and 12 show the seventh and eighth working steps. In this work process, the lower slab lower surface 12
To the upper anchor bolt 27, and the anchor nut 30.
Fix with. The gap between the lower slab lower surface 12 and the sole plate 28 is filled with resin, mortar, or the like. Further, in this work process, the flange plate 31 of the newly-installed bearing device 5a, which is a rubber shoe, is fixed to the ground with six center bolts (not shown), and then the sole plate is placed at a predetermined position. 28 and the flange plate of the newly installed bearing device 5a are grounded and fixed with six set bolts on the outside.

FIG. 13 shows a ninth working step. In this work process, the bed plate 31 and the lower anchor bolt 32 are fixed to the newly installed bearing device 5a with set bolts.

FIG. 14 shows the tenth working step. In this work process, concrete 33 is cast at the scribing position 24 of the pier upper part 4, the lower anchor bolt 32 is buried therein, and further, a non-shrink mortar serving as a bearing seat 34 of the bearing device 5a is cast. . Subsequently, the temporary bearing member 17 is cut with a wire saw, disassembled and removed, and the replacement of the bearing device is completed. FIG. 15 shows a state at the time of completion of the work. According to the present invention, the operation of replacing the old and new bearing devices is performed smoothly in the upper part of the pier through the above-mentioned work process.

[0027]

As described above, according to the present invention,
When replacing the bearing device in a structure in which the upper structure is supported by the bearing device installed on the upper surface of the lower structure, the curable fluid filler injected from above the injection hole vertically penetrating the upper structure is moved downward. Pour into the surrounding formwork provided on the upper surface of the structure, form and harden it into a block shape to build a temporary support member of the upper structure, dismantle and remove the temporary support member after the replacement work of the old and new bearing devices is completed Therefore, in a narrow space between the upper surface of the lower structure where the bearing device is installed and the lower surface of the upper structure, the temporary bearing member can be constructed by a simple and safe operation, and the temporary bearing is reliably mounted. In addition, there is an excellent effect that it is easy to cut and disassemble and remove it. When the upper structure is a box girder having a partition wall between the upper slab and the lower slab, the provision of the temporary bearing member at a position below the lower slab eliminates the need for reinforcement of the lower slab. Has an excellent effect.

[Brief description of the drawings]

FIG. 1 is an overall view of a continuous box girder bridge.

FIG. 2 is an enlarged cross-sectional detailed view of a part A in FIG. 1 also illustrating a first operation step of the present invention.

FIG. 3 is a vertical cross-sectional view of a central part of FIG. 2;

FIG. 4 is an explanatory plan view showing a part of an upper part of a pier in FIG. 2 with a part omitted;

FIG. 5A is a sectional view of a bearing structure in a second operation step of the bearing device replacement method of the present invention, and FIG. 5B is a view of FIG.
3 is a half sectional view of a central part of FIG.

FIG. 6A is a sectional view of a bearing structure in a third operation step, and FIG. 6B is a half sectional view of a central portion of FIG.

FIG. 7A is an enlarged cross-sectional view showing a construction process of a temporary support member, and FIG. 7B is an enlarged cross-sectional view showing a completed structure of the temporary support member.

8A is a cross-sectional view of a bearing portion structure in a fourth operation step, and FIG. 8B is a half-sectional view of a central portion of FIG. 8A.

9A is a sectional view of a bearing structure in a fifth operation step, and FIG. 9B is a half sectional view of a central portion of FIG. 9A.

FIG. 10A is a sectional view of a bearing portion structure in a sixth working step, and FIG. 10B is a half sectional view of a central portion of FIG.

11A is a cross-sectional view of a bearing structure in a seventh working process, and FIG. 11B is a half-sectional view of the center of FIG.

12A is a cross-sectional view of a bearing structure in an eighth working step, and FIG. 12B is a half-sectional view of a central portion of FIG.

13A is a cross-sectional view of a bearing structure in a ninth operation step, and FIG. 13B is a half-sectional view of a central portion of FIG.

14A is a sectional view of a bearing structure in a tenth working step, and FIG. 14B is a half sectional view of the center of FIG.

15A is a cross-sectional view of the support portion structure in a state where the replacement operation of the support device is completed, and FIG. 15B is a half-sectional view of the center of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Bridge pier 3 Abutment 4 Upper pier 5,5a Bearing device 6 Box girder 7 Bridge pier upper surface 8 Lower anchor bolt 9 Road 10 Upper slab 11 Lower slab 12 Lower slab lower surface 13 Support point upper partition wall 14 Both side partition wall 15 Jack receiving portion 16 Temporary Receiving jack 17 Temporary bearing member 18 Injection hole 20 Formwork 21 Non-shrinkable mortar 22 Lower slab upper surface 24 Shearing position 25 Anchor cutting place 26 Anchor bolt insertion hole 27 Upper anchor bolt 28 Sole plate 30 Anchor nut 31 Flange plate 32 Lower anchor bolt 33 Concrete 34 bearing seat

Claims (2)

[Claims] 1. A bearing structure for supporting an upper structure by a bearing device installed on an upper surface of a lower structure, wherein after the upper structure is lifted from the bearing device by a temporary receiving jack, the load on the upper structure is reduced. In the replacement method of the bearing device in which the reaction force is transferred from the temporary receiving jack to the temporary bearing member to replace the old and new bearing devices, and the temporary bearing member is removed in the subsequent work process, the temporary bearing jack is used to replace the bearing device. An injection hole that penetrates the upper structure floating vertically from the upper structure is opened, and the time-curable fluid filler injected from above the injection hole is poured into an enclosing formwork installed on the upper surface of the lower structure. ,
A method of replacing a bearing device, comprising forming and hardening a temporary support member into a block shape to form a temporary bearing member, and disassembling and removing the temporary bearing member after the replacement work of the old and new bearing devices is completed. 2. The injection box according to claim 2, wherein the upper structure is a box girder having an upper slab and a lower slab, and having a fulcrum upper partition between upper and lower slabs and both side partitions provided therebetween. 2. A temporary support member formed through the lower slab and formed of the time-curable fluid filling material filled through the injection hole is provided at a lower position of the partition walls on both sides. How to replace the bearing device described.