JP2008157006A - Replacing construction method of support device of bridge girder and temporary receiving jack for inside of hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of requiring much cost and labor for manufacture and installation of temporary receiving members in large-scale, which is required during the time, generally as long as several ten days to several months, until the completion of the installation/fixation of a new support device by disassembling and removing an old support device in replacing work of a support device of a pier. <P>SOLUTION: This replacing construction method comprises a preparing process of installing a temporary receiving jack for the hole inside in a drilled hole, by drilling the hole in the horizontal direction in the pier of a lower part of the support device, before the replacing work of the support device; a process of removing a concrete skeleton and the old support device of an upper part of the drilled hole in the next place, by removing the temporary receiving jack for the hole inside installed in the drilled hole, after temporarily receiving a bridge girder by using the temporary receiving jack; and a process of removing the temporary receiving jack, after fixing the support device and a pier upper part by filling a hardening material by installing the new support device in a removed concrete skeleton part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a replacement method for a support device for supporting a bridge girder provided between a bridge pier and a bridge girder, and a temporary receiving jack for a hole applied to the replacement method.

  Bridge girders such as railroad bridges and road bridges are supported by bearing devices provided on the upper surface of the pier, but have reached the end of their service life due to long-term use, or when they are replaced with earthquake-resistant bearing devices in preparation for earthquakes For example, replacement work for bearing devices is being carried out at bridges nationwide. These replacement work is expected to increase in the future.

  When replacing the support device provided on the top of the pier, generally the temporary support jack is used to lift the bridge girder and lift it from the support device, then temporarily fix the bridge girder using the temporary support material and then remove the support device. After that, a method of fixing and installing a new bearing device, a method of attaching about 4 brackets, for example, a steel pier to a pier, and installing a jack on this bracket to temporarily receive a bridge girder, etc. Was done.

  However, when replacing the pier support device, it generally takes several tens of days to several months until the old support device is dismantled and the installation and fixing of the new support device is completed. Although it will be lifted slightly, it is impossible to lift and support a bridge girder of several hundred tons with a temporary receiving jack for a long time. After floating, the temporary receiving member processed steel material is sandwiched between the pier upper surface and the lower surface of the bridge girder to exchange the bridge girder load, and then the temporary receiving jack is removed. It was necessary to produce and set up a large amount of cost and labor.

  There is also a case where there is no space for installing a temporary support member between the upper surface of the bridge pier and the lower surface of the bridge girder. In that case, a method of installing a temporary reception vent in the vicinity of the bridge pier is performed. This is not only necessary, but there may be no space to install a vent.

  Furthermore, in the method of attaching the bracket for temporary receiving, which is a combination of the above-mentioned steel plate and mold steel, to the pier, a hole was drilled in the pier and an anchor bolt for fixing the bracket was embedded in this hole. This will damage the pier. In addition, when drilling, there is a case where it is not possible to drill at a predetermined position due to interference with the reinforcing bar inside the pier. In this case, there is a problem that it is necessary to process the mounting hole of the bracket on site.

  On the other hand, in any of the methods, there are many cases where the concrete frame on the lower part of the support device, that is, the upper surface of the pier is deteriorated. In that case, after removing these, high strength such as non-shrink mortar or concrete is newly added. Although it is necessary to cast hardened material, it is extremely difficult to remove the concrete frame at the bottom of the support device in a small space between the bridge girder and the pier because the work space and the installation space for the chipping device are small. It was a difficult task.

  The present invention has been made in view of such circumstances. The bridge girder support device that solves the above-described problems, is excellent in workability, has few restrictions on application conditions such as installation location, and can be constructed in a short period of time. Replacement method and provisional jack for in-hole are provided.

  In order to achieve the above object, the bridge girder support device replacement method according to the present invention includes, as described in claim 1, prior to replacement work of a support device that supports a bridge girder provided on a bridge pier. After drilling the upper part of the pier upper part in the horizontal direction in the horizontal direction and installing the temporary receiving jack for the hole in the drilling hole, and temporarily receiving the bridge girder using the temporary receiving jack, Remove the installed temporary receiving jack in the hole, and then remove the concrete frame and the old bearing device above the hole, and install a new bearing device on the removed concrete frame and put the hardener. A method for replacing a bridge girder support device, comprising: a step of filling and fixing the support device and the upper portion of the pier, and then removing the temporary receiving jack.

  According to the above, prior to replacement of the support device for supporting the bridge girder provided on the pier, the pier portion of the lower portion of the support device is previously drilled in the horizontal direction, and the bore is inserted into the drill hole. The preparatory work for installing the temporary support jack can be performed without interrupting the traffic on the bridge, and when replacing the support device, the bridge girder should be installed using the temporary support jack generally used near the support device. Once temporarily received, and then removing the temporary receiving jack installed in the hole, the concrete frame and the old bearing device on the pier upper surface can be easily and quickly removed using the hole. Therefore, it is not necessary to perform provisional acceptance for a long time using a large provisional receiving material.

  Further, in the temporary receiving jack for hole according to the present invention, the hole inner surface holding member provided with the inclined contact surface is installed in the vertical direction, and the wedge member provided with the contact surface coincident with the inclination of the contact surface, In the hole applied to the bridge girder support method, wherein the hole inner surface holding member is moved up and down in the vertical direction by moving the hole inner surface holding member remotely in the hole axis direction. It is a temporary receiving jack.

  With such a jack, it is possible to handle a large load with a simple structure, and only the jack main body can be freely installed at a required position in the drilling hole by remote operation to temporarily receive the upper load. be able to.

  As described above, if the bridge girder support exchanging method of the present invention and the temporary receiving jack in the hole are applied, the concrete frame and the old support device on the upper part of the pier can be easily and quickly removed without blocking the traffic on the bridge. It can be removed and replaced with a new bearing device, and there is no need to perform temporary receiving using a large temporary receiving material as in the past, so that workability can be greatly improved and costs can be reduced. .

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view showing a general pier 1, a bridge girder 2, and a support device 3, and FIG. 2 is a front view of the same. In addition, although the bridge girder 2 in this figure has shown the example of steel girders, it may be made of concrete.

  3 to 8 are diagrams schematically showing a method of replacing the bridge girder support device according to the present invention. First, as shown in FIG. 3, the lower portion of the support device is drilled in the horizontal direction. After providing the hole 4, the in-hole temporary receiving jack A is immediately inserted. Details of the in-hole temporary receiving jack A will be described in detail with reference to FIGS.

  Next, as shown in FIG. 4, after inserting the temporary receiving jack A for holes into the position immediately below the support device 3, a hole inner surface holding member 101 described later built in the jack A is expanded, The upper load, that is, the support device 3 is temporarily received by abutting against the inner wall surface.

  Subsequently, as shown in FIG. 5, the hole inner surface holding member 101 is expanded in the same manner as described above while sequentially drilling a plurality of positions so as to cover the range of removing the concrete near the lower portion of the support device 3. Temporary receiving is performed by contacting the inner surface of the hole wall. In FIG. 5, five holes are continuously provided so that the hole holes are in contact with each other, but holes may be formed with some intervals.

  In this way, a drill hole having a relatively small diameter as compared with the size of the support portion 3 is provided, and at the same time, a temporary support is performed in the drill hole. Temporary backing materials are unnecessary and simple. For example, in the case of a railway bridge, the work can often be performed only for a short time from the last train to the first train. However, this work can be performed in advance prior to the main work for replacing the support device 3. good.

  Next, in FIG. 9 to FIG. 13, the in-hole temporary receiving jack A will be described in detail. 9 is a sectional view in the axial direction of the temporary receiving jack A for holes, and FIG. 10 is a sectional view taken along the line aa in FIG. In FIG. 9, reference numeral 101 denotes a hole inner surface holding member, which is installed symmetrically in the vertical direction. FIGS. 11A and 11B are three views of the hole inner surface holding member 101. FIG. 11A is a front view, FIG. 11B is a side view, and FIG.

  In FIG. 11, 101a is a hole inner surface abutting portion, which is a rounded surface along the hole inner surface. Reference numeral 101b denotes an inclined surface portion, which coincides with an inclined surface of a wedge member 102 described later. 101 c is a side guide that guides the side surface of the wedge member 102. Reference numeral 101d denotes a groove for installing an elastic material, and an elastic material 110 such as a rubber band described later is installed.

  Returning to FIG. 9, the wedge member 102 is installed between the hole inner surface holding members 101 installed symmetrically in the vertical direction, and the screw jack 103 is screwed into the central shaft portion thereof. The axial movement of the flange 103a provided on the screw jack 103 is restricted by the rear fixing member 105 and the rear fixing member cover 106, and the chamfered portion 103b provided on the screw jack 103 is rotated using a socket wrench or the like. Then, the wedge member 102 advances and retreats with respect to the rear fixing member 105.

  A front fixing member 104 is rigidly connected to the rear fixing member 105 by a connecting rod 107. The guide portion 104 a provided on the front fixing member 104 and the guide portion 105 a provided on the rear fixing member 105 guide the side guide 101 c provided on the aforementioned hole inner surface holding member 101. That is, the movement of the hole inner surface holding member 101 is restricted only in the vertical direction.

  Reference numeral 108 denotes a handle, and the pin portion 108 a fits into a pin insertion hole 106 a provided in the rear fixing material cover 106. Reference numeral 109 denotes a rod, and the socket portion 109 a fits into a chamfered portion 103 b provided on the screw jack 103. When the handle 108 is used as a reaction force and the chamfered portion 109b provided on the rod 109 is rotated using a wrench or the like, the screw jack 103 is rotated, the wedge member 102 is moved forward and backward, and the hole inner surface holding member 101 is moved forward and backward accordingly. To do. As shown in the figure, if the handle 108 and rod 109 are made longer than the hole opening and are detachable, a plurality of temporary receiving jacks A for holes can be operated with one set of handle and rod. Convenient.

  Reference numeral 110 denotes an elastic material made of an endless rubber band, which is fitted in a groove 101d provided in the hole inner surface holding member 101, and is opposed to the hole inner surface holding member 101 so as not to be disassembled into pieces. They are pulling each other. Note that the hole inner surface holding members 101 may be pulled together using a spring or the like as the elastic material.

  The temporary receiving jack A for the hole can be reduced in the vertical dimension by adopting the structure as described above, and can be applied to the small-diameter hole, and the hole inner surface holding member 101 is strengthened by the boosting effect by the wedge. Can be pressed against the inner surface of the hole wall, and the upper load of the hole can be reliably received temporarily. In this example, the wedge member is advanced and retracted with a screw jack. However, the wedge member may be advanced and retracted using, for example, a hydraulic jack, and the wedge member can be advanced and retracted remotely from a slightly separated position. There are no particular restrictions.

  FIG. 12 shows that the wedge member 102 of the temporary receiving jack A for hole is moved forward by operating the screw jack, the hole inner surface holding member 101 is moved up and down, and the handle 108 and the rod 109 are removed. Shows the state.

  FIG. 13 is a schematic view of the in-hole temporary receiving jack A in FIG. 9, and 112 is a wire for pulling back the in-hole temporary receiving jack A.

  FIG. 14 is a diagram showing a procedure for temporarily receiving the in-hole temporary receiving jack A in the drilling hole. FIG. 14A shows a predetermined position in the hole in a state where the hole inner surface holding member 101 is reduced. (B) shows that the handle 108 is a reaction force, the lever 111 attached to the rod 109 is operated, the screw jack 103 is rotated, and the hole inner surface holding member 101 is advanced in the vertical direction. FIG. 4C shows a state in which the handle, rod, and lever are removed. When removing the in-hole temporary receiving jack A, the procedure is reversed.

  As described above, when the in-hole temporary receiving jack A is used, the temporary receiving can be easily performed at a free position in the hole or removed by a simple operation.

  Next, the continuation of the description in [0018] will be described with reference to FIG. 5 is a temporary receiving jack for temporarily receiving the bridge girder for a short time, and is installed in the vicinity of the supporting device 3 to be replaced to temporarily receive the bridge girder. Next, the in-hole temporary receiving jack A temporarily received in the drilled hole 4 is removed in the above-described procedure. Incidentally, if the jack is once expanded slightly in the hole before removing the jack A, the concrete frame can be cracked in the horizontal direction, and the concrete removal work described later is further facilitated.

  Next, as shown in FIG. 7, the upper part of the hole hole 4, that is, the concrete housing portion 6 under the bearing device 3 is removed by scraping and the old bearing device 3 is also removed at the same time. Since 4 is provided, the work of removing the concrete housing portion 6 by scraping it can be performed very easily and in a short time. Incidentally, when removing a chip without providing the hole 4 of the present invention, the working space is limited, so that only a small chipping machine can often be used, workability and efficiency are poor, and Even if a chipping machine is used directly under the apparatus, it is not easy to remove the entire chip, which requires a long and difficult work.

  After removing the above-mentioned concrete housing portion 6 by scraping, as shown in FIG. 8, a new support device 3 is attached, and then the high-strength such as non-shrinking and quick-setting mortar or concrete is attached to the location where the scraping is removed. Fill with hardener. 8 is an anchor bolt, and it is preferable to install a necessary number in advance. In addition, you may install a reinforcing bar, a formwork, etc. prior to filling as needed.

  When the cured material filled in the above cures to a predetermined strength, the provisional jack 5 described above is removed, and a series of replacement work is completed.

It is a side view which shows a general pier, a bridge girder, and a support part. FIG. It is sectional drawing of the side which shows the state which has inserted the temporary receptacle jack for holes in the drilling hole among the replacement methods of the support part which concerns on this invention. It is sectional drawing of the side surface which shows the state temporarily received using the temporary receiving jack for holes similarly. FIG. It is a front view which shows the state which installed the temporary receiving jack and removed the temporary receiving jack for holes in the same. It is a front view which shows the state which took off the concrete housing | casing part 6 and removed. It is sectional drawing of the side surface which shows the state with which the hardening material was filled similarly. It is sectional drawing of the axial direction of the temporary receiving jack A for holes. It is aa sectional drawing in FIG. FIG. 6 is a three-side view of a hole inner surface holding member 101. It is a figure which shows the state which advanced the temporary receptacle jack A for holes in FIG. 9 to the up-down direction. FIG. 10 is a general view of the in-hole temporary receiving jack A in FIG. 9. It is a figure which shows the procedure which provisionally receives the temporary receiving jack A for holes in a drilling hole.

Explanation of symbols

A In-hole temporary receiving jack 1 Bridge pier 2 Bridge girder 3 Bearing portion 4 Drilling hole 5 Temporary receiving jack 6 Concrete body removing portion 7 Hardened material 8 Anchor bolt 101 Hole inner surface holding member 102 Wedge member 103 Screw jack 104 Front fixing member 105 Rear portion Fixing member 106 Rear fixing material cover 107 Connecting rod 108 Handle 109 Rod 110 Stretch material 111 Lever 112 Wire

Claims (2)

In the replacement method of the support device for supporting the bridge girder provided on the pier, the upper part of the pier under the support device is drilled in the horizontal direction prior to the replacement work, and the temporary receiving jack for in-hole is installed in the drill hole A preparation process;
After temporarily receiving the bridge girder using the temporary receiving jack, removing the temporary receiving jack for hole installed in the drilling hole, and then removing the concrete frame and the old bearing device above the drilling hole; and After removing the temporary support jack, after installing the new bearing device and filling the hardened material and fixing the bearing device and the upper part of the pier in the removed concrete frame part,
Replacement method for bridge girder support device, characterized by comprising   A hole inner surface holding member having an inclined contact surface is installed in the vertical direction, and a wedge member having a contact surface coinciding with the inclination of the contact surface is remotely operated in the hole axial direction with respect to the hole inner surface holding member. 2. The temporary receiving jack for a hole applied to the replacement method for a bridge girder support device according to claim 1, wherein the inner surface holding member of the hole advances and retreats in a vertical direction.

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