KR100405404B1 - replacing method of bridge bearing for equally distributing load - Google Patents

Abstract

The present invention relates to a method for replacing load-bearing bridge bearings, the method comprising: obtaining a thickness change value according to a working load of a predetermined elastic body; lifting the upper structure to remove the first bridge bearing on the piers; The first measurement step of measuring the working load of the superstructure at each support point on the pier via the above elastic body and the same type of elastic body between the piers, comparing the planned load and the measured working load at each support point to calculate the difference value And inserting a simple rate between the piers and the superstructure according to the thickness change value of the elastic body corresponding to the calculated difference value to adjust the spacing of the space where the second bridge bearing is to be inserted, and having the same elastic body as the upper elastic body. It consists of a configuration including the step of fixing the bridge bearing, the jackup and jackdown of the superstructure It can reduce the number of times, improve the efficiency of maintenance, repair and replacement of bridge bearings, improve the seismic strength of bridges, and make the bearings of the supporting point receive the planned load when designing. Not only does the bridge last longer, but the bearing itself is longer.

Description

{Replacing method of bridge bearing for equally distributing load}

The present invention relates to a bridge bearing replacement method, and more particularly, to a bridge bearing replacement method that is installed on a bridge pier to support a load of an upper structure such as a steel plate and a steel box attached thereto.

In general, bridges should be designed in consideration of not only contraction or expansion as the temperature changes, but also a large impact force between the superstructure and the pier during an earthquake. That is, the support points on the same support line as the fixed support point and the axial direction and the direction perpendicular to the fixed support point allow the superstructure to move in one direction, and the rest of the support to move in both directions. It is necessary to design the bridge bearing.

1 is a partial perspective view of a bridge for explaining the installation state of the bridge bearing, Figure 2 is a view for explaining the unbalanced state of the support load of each bridge bearing.

As shown in FIG. 1 and FIG. 2, the bridge 100 is largely formed between the upper structure 120 having the bridge 110, the steel box 122, and the upper plate 124, and the bridge 110 and the upper structure 120. It can be divided into a bridge bearing 130 for supporting the load of the upper structure 120. Of course, depending on the type of the bridge, instead of the steel box 122, a steel plate girder (steel plate girder), P.S.C beam (Pre-Stressed Concrete Beam) and the like are also many.

In the state as shown, a plurality of bridge bearings 130 are installed on one bridge 110 to support the load of the upper structure 120. The bridge bearings 130 installed at each support point share and support the load of the upper structure 120, and share the load according to the shape of the top plate 124 or the position of the support point to support the planned load. That is, a bridge bearing having a relatively large capacity is installed in the center, and a bridge bearing 130 having a smaller capacity may be disposed on the left and right to support the load of the upper structure 120, and all bridge bearings ( 130 may all support the same amount of load. The bridge bearing 130 only needs to be able to support the planned load for its capacity. Here, an example in which the planned loads of all the bridge bearings 130 are the same will be described. If the bridge bearing 130 is damaged due to aging or load bias, it should be replaced.

Conventionally, in order to replace the bridge bearing 130, the upper structure 120 by installing a jack between the bridge 110 and the upper structure 120, that is, the bridge 110 and the steel box 122, etc. Lift within the range of no problem (generally within 10 mm), remove the bridge bearing 130 installed on the bridge 110, and then install the reference plane in accordance with the height of the new bridge bearing at that position, A new bridge bearing was inserted and fixed on top. That is, in the related art, the bridge bearing 130 was replaced with only the height. Of course, if the quality of the bridge bearing 130 is uniform, and the height of each support point is on the same horizontal plane, correcting the height may solve the unbalance of the support load to some extent, but it is also difficult to accurately adjust the height. However, it is difficult to solve the load imbalance fundamentally due to various factors. Also, in bridges that are not straight lines such as overpasses, the unbalance of each support load becomes more severe because each support point does not exist on the same horizontal plane.

Accordingly, when replacing the bridge bearing in a conventional manner, in most cases, the load acting on the bridge bearing 130 installed at each support point is unbalanced as shown in FIG. 2. That is, for example, a load of 70 tons is applied to the bridge bearing 130 on one side, a load of 110 tons on the bridge bearing 130 on the other side, and a load of 120 tons on the other bridge bearing 130. 100 tons of load act on each. Since each bridge bearing 130 is designed to be suitable for a load of 100 tons, the bridge bearing 130 supporting the overload is easily broken or shortened in life, and the seismic performance and the seismic performance are reduced.

It is an object of the present invention to provide a load balancing bridge bearing replacement method that allows the replaced bridge bearing to receive a planned load so that load imbalance does not occur.

1 is a partial perspective view of a bridge for explaining the installation state of the bridge bearing,

2 is a view for explaining an unbalanced state of the support load of each bridge bearing,

3 is a cross-sectional view showing the load measuring means used in the method of replacing the load balancing bridge bearing according to the present invention;

4 to 11 are views showing the replacement process of the bridge bearing according to the method of the present invention in order,

12 is a flowchart illustrating a load balancing bridge bearing replacement method according to the present invention.

Explanation of symbols on the main parts of the drawings

100: bridge 110: bridge

120: upper structure 122: steel box

124: top 140: Jack

171: simple rate 172: sole plate

174: support 176: reference plane

178: non-contraction mortar 180: non-contraction concrete

188: leveling bolt 190: first bridge bearing

200: load measuring means 220: elastic body

230: pressure sensor 300: second bridge bearing

SUMMARY OF THE INVENTION An object of the present invention is a method for replacing a first bridge bearing installed between a bridge and an upper structure with a second bridge bearing, the method comprising: obtaining a thickness change value according to a working load of a predetermined elastic body, lifting the upper structure, and removing the first bridge bearing. 1st step of removing the bridge bearing, the first measuring step of measuring the working load of the superstructure at each support point on the pier, between the superstructure and the pier, with the above elastic body and the same elastic body, planned load and measurement at each support point Comparing the applied working loads to calculate the difference value and inserting a simple rate between the piers and the superstructure according to the thickness change value of the elastic body corresponding to the calculated difference value to adjust the interval of the space in which the second bridge bearing is to be inserted. And fixing the second bridge bearing having an elastic body of the same type as the above elastic body. By the load bearing bridges evenly distributed switching method, which can be achieved.

The first measurement step is to install the reference plane at each support point on the piers, allowing the tilting of the support and the simple structure for fine height adjustment considering the height difference between the second bridge bearing between the reference plane and the superstructure It is good to have a configuration comprising the step of installing the load measuring means via the tilting machine, the step of lowering the upper structure, and the step of measuring the working load at each support point by the load measuring means.

If necessary, in accordance with the thickness change of the elastic body corresponding to the difference value calculated above, the simple plate is separated from the reference plane and the superstructure, or a new simple plate is interposed between the reference plane and the superstructure, and the load of the superstructure at each support point. It may be configured to further include a second measurement step of measuring the.

The step of fixing the second bridge bearing is to lift the upper structure to remove the load measuring means and the support and the tilting machine from the reference plane, inserting the second bridge bearing between the reference plane and the upper structure, the lower part of the piers, the upper part It is preferable that the configuration having a step of fixing to the bottom of the upper structure, respectively.

In some cases, the first measuring step includes: installing a reference plane at each support point on the piers; disposing a second bridge bearing having a load measuring means having an elastic body interposed between the reference plane and the upper structure with a simple rate; It is good also as a structure including the step of lowering a structure, and measuring the working load at each support point by the load measuring means provided in the 2nd bridge bearing.

If necessary, adjust the thickness of the elastic body corresponding to the difference value calculated above to deviate the simple plate between the reference plane and the superstructure, or add a new simple plate between the reference plane and the superstructure to load the superstructure at each support point. It may be configured to further include a second measurement step of measuring.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a cross-sectional view showing the load measuring means used in the load balancing bridge bearing replacement method according to the present invention.

As shown in FIG. 3, the load measuring means 200 is coupled to the lower body 210 and the groove 212 in which the groove 212 and the groove 212 formed on the upper surface of the connection passage 214 are formed. The cover 240 mounted on the elastic member 220 and the signal line 234 connecting the pressure sensor 230 and the socket 232 and the pressure sensor 230 disposed under the elastic member 220 and the elastic member 220. I have. The upper edge of the elastic body 220 is provided with a metal ring 222 so that the edge of the elastic body 220 is not separated. As the elastic body 220, a compressed rubber plate may be used. When the elastic body 220 is subjected to a high pressure through the cover 240 in the groove 212 and acts like a fluid, even if the elastic body 220 is deformed under an unbalanced load, the load measured by the pressure sensor 230 is the same. Of course, in order to measure the pressure is connected to the pressure sensor 230 through the socket 232, there must be a separate instrument that can detect the signal output from the pressure sensor 230.

4 to 11 are views showing the replacement process of the bridge bearing according to the method of the present invention in sequence, Figure 12 is a flow chart for explaining a load balancing bridge bearing replacement method according to the present invention.

In order to implement the method of replacing the load balancing bridge bearing according to the present invention, first, the thickness change value according to the load of the elastic body 220 installed in the load measuring means 200 described with reference to FIG. 3 is measured (step 1). Of course, the upper limit and the lower limit within a predetermined range are set based on the load to be loaded by the bridge bearing to be replaced, and the thickness change value of the elastic body 220 is measured in a predetermined load unit within the range, and then graphed or digitized. It is good to put.

Then, a jack up design using the jack 140 is performed. Considerations in the design of jack-up include: checking and reviewing load conditions of support points, calculating jack load capacity and quantity by design load, setting up jack-up height, designing reinforcement pressure plate 142, and accommodating regular movement. Sliding plate design, ring nut (146) design to secure jack-up height to prevent jack-down due to loss of jack internal pressure during long-term jack-up.

Then select the installation position of the jack. In order to select the installation position of the jack, the load can be directly transmitted to the diaphragm of the upper steel box girder, and the position is selected in consideration of the acupressure edge distance of the lower structure.

After the installation position of the jack is selected, as shown in FIG. 4, the sand 148 is laid on the selected position for flattening, and the gap between the lower surface of the steel box 122 and the required amount of reinforcement pressure plate 142 are calculated. In addition, a thin rubber pad 150 is laid below the jack 140, and a support 152 is installed thereon. Reinforcement plate 142 on the support 152, the sliding block 154 is mounted thereon, the reinforcing plate attached to the ring nut 146, the upper reinforcement pressure plate 156, fluorine resin plate (PTFE) ( 158, a sliding plate 144 with a stainless sheet attached thereto, an upper reinforcing plate 160, and a rubber plate 162. In addition, it is good to have a protective device 170 to prevent the concrete debris to splash toward the jack 140 during the concrete crushing operation.

On the other hand, unscrew the nut 192 holding the first bridge bearing 190 previously installed, and jack up at each support point at the same time with a dial gauge for upward displacement measurement on the left and right sides of the steel box. (Step 2). Jack-up depends on the bridge, but generally it is better to be within 10mm.

After sufficiently jacking up, as shown in FIG. 5, the concrete on the bridge 110 is broken, the anchor bolt 194 is cut and removed, and then the first bridge bearing 190 is removed (step 3).

After removing the first bridge bearing 190 and chipping cleanly so that the cushion rebar is exposed as shown in FIG. 6, the rebar 196 is welded and assembled with reference to the height and size of the replacement bearing approved for design. Install formwork 198 around it.

Then, as shown in Figure 7, the leveling bolt (188) that can be adjusted in height in consideration of the height of the replacement bearing, non-concrete concrete, mortar, sole plate (sole plate), etc. Install and clean.

Then, as shown in FIG. 8, level the temporary plate 184 with the fastener 186 for fastening the second bridge bearing to be replaced with the leveling bolt 188, and then adjust the water leveler 182. Use it horizontally. In this state, the non-condensed concrete 180 is poured, and the poured non-condensed concrete is half cured, and then the surface of the non-condensed concrete 180 is scraped to a suitable area for mortar casting, and the non-condensed concrete 180 is cured. do.

After curing of the non-condensed concrete 180, as shown in FIG. 9, the non-condensed mortar 178 is poured onto the surface of the cured non-condensed concrete 180 and cured. After completely curing the mortar 178, the temporary plate 184 and the formwork 198 are removed, and there are pores in the cured non-contraction concrete 180 and the like, and there are pores, and epoxy resin is injected into the pores. The installation of the reference plane 176 for the installation of the second bridge bearing for replacement by this process is completed (step 4).

When the installation of the reference surface 176 of each support point is completed, considering the height of the second bridge bearing 300 to be newly installed on all the support points of the same piers 110, the support 174, the sole plate (sole plate, 172), the upper The load measuring means 200 is installed at a planned height through a tilting machine 175 and a simple plate 171 allowing the tilting of the structure 120, and jack down while checking the left and right slopes. Let's do it. Then, the working load at each support point is measured (step 5).

After measuring the working load at each support point, check whether there is a difference between the planned load and the measured load at that support point (step 6), and if there is a difference between the planned load and the measured load, calculate the difference value (step 7). ), The upper structure is jacked up again, and the simple rate is added to or subtracted from the thickness change calculated in step 1. For example, the planned load at each support point is 100 tons, and the change in thickness of the elastic body according to the working load in the vicinity thereof is shown in Table 1.

Table 1.

Working load (ton) 50 60 70 80 90 100 110 120 130 140 150 Elastic body thickness (mm) 20.0 19.8 19.61 19.43 19.26 19.10 18.95 18.81 18.68 18.56 18.46 Thickness change value (mm) 0.0 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.10

When the working load at each support point is as shown in Fig. 2, the thickness change value of the elastic body is calculated based on 70 tons of the working load of the third support point from the left, which shows the largest difference from the planned load at each support point. In other words, the thickness of the elastic body when the working load is 70 tons minus the thickness of the elastic body when the working load is 100 tons 19.10 mm, that is, 0.51 mm is the change in thickness of the elastic body according to the difference between the planned load and the working load. Combining the simple rate 171 as much as this thickness, or if there is a simple rate corresponding to the thickness, inserts the simple rate 171 into the third supporting point from the left and jacks down to 100 at the supporting point. Allow to receive a ton load. Then, the overloaded load at the left and right support points is adjusted to the vicinity of the planned load (step 8).

Then jack down again to lower the superstructure and measure the superstructure load at its support point again (step 9). Check whether there is a difference between the planned load and the measured load (step 10), if there is a difference, repeat steps 7 to 10, and if there is no difference, lift up the superstructure by lifting up the superstructure and then detach the load measuring means 200. The simple plate 171 is laid on the reference surface, and the sole plate 172 is welded to the bottom of the steel box 122 and used in consideration of the height difference between the second bridge bearing 300 and the load measuring means 200. After the support 174 is removed, the second bridge bearing 300 having the same type of elastic body as that of the elastic body having measured the thickness change value according to the working load is inserted and fixed on the reference surface using a foundation bolt and a nut. Then, the jack 140 is removed and the upper bridge of the second bridge bearing 300 is welded to the sole plate 172 to fix the bridge bearing replacement work (step 11). Of course, the elastic body 220 installed in the second bridge bearing 300 is also most accurate to use the same thickness as the elastic body in the load measuring means.

In step 6, if there is no difference between the measured load and the planned load, steps 7 to 10 may be omitted, and step 11 may be immediately executed.

Meanwhile, in step 5, the second bridge bearing having the load measuring means may be directly inserted between the reference plane 176 and the steel box 122 and the above steps 6 to 11 may be repeated. In this case, the support 174 does not need to be used, and after the upper structure 120 is jacked up, the load measuring means 200 is separated and then the second bridge 300 is disposed between the reference plane 176 and the steel box 122. It is even better because it can reduce some of the insertion process.

That is, when the bridge bearing is replaced according to the method of the present invention, the number of jackdowns and jackups of the bridge superstructure can be drastically reduced, and the bridge bearings at each support point support the planned load evenly or within an error range. You can do it.

As can be seen from the above description, the use of the method of equally distributed bridge bearing replacement according to the present invention can reduce the number of jackups and jackdowns of the superstructure, thereby improving the efficiency of maintenance, repair and replacement of the bridge bearings. In addition, the seismic force of the bridge can be improved.

In addition, the bearing of the supporting point can be subjected to the planned load when designing, so that not only the bridge has a long life, but also the life of the replaced bearing itself.

Claims (6)

A method for replacing a first bridge bearing installed between a pier and a superstructure with a second bridge bearing, Obtaining a thickness change value according to the working load of the predetermined elastic body; Lifting the superstructure to remove the first bridge bearing on the piers; A first measuring step of measuring a working load of the upper structure at each of the supporting points on the pier via the elastic body and the same type of elastic body between the upper structure and the pier; Calculating a difference value by comparing a planned load at each support point with the measured working load; And Inserting a simple rate between the bridge and the upper structure in accordance with the thickness change value of the elastic body corresponding to the calculated difference value to adjust the interval of the space in which the second bridge bearing is to be inserted and has an elastic body of the same type as the elastic body Method for replacing the load balancing bridge bearing, comprising the step of fixing the second bridge bearing. The method of claim 1, wherein the first measuring step comprises: installing a reference plane at each support point on the piers, and adjusting the support and the fine height considering the height difference between the second bridge bearing between the reference plane and the superstructure. Installing a load measuring means via a tilting device allowing tilting of the simple structure and the upper structure, lowering the upper structure, and measuring the working load at each support point with the load measuring means; Method for replacing the load balancing bridge bearing, characterized in that. 3. The method of claim 2, wherein the simple plate is separated from the reference plane and the superstructure according to the thickness change value of the elastic body corresponding to the calculated difference value, or a new simple plate is further interposed between the reference plane and the superstructure. And a second measuring step of measuring the load of the superstructure at each of the supporting points. 4. The method of claim 3, wherein the fixing of the second bridge bearing comprises lifting the upper structure to separate the load measuring means, the support and the tilting device from the reference surface, and separating the second bridge bearing between the reference surface and the upper structure. And inserting the lower portion into the piers and the upper portion fixing to the bottom surface of the upper structure, respectively. The second bridge according to claim 1, wherein the first measuring step comprises: installing a reference plane at each support point on the piers; and a second bridge having load measuring means having the elastic body interposed between the reference plane and the upper structure via a simple rate. Arranging a bearing, lowering the upper structure, and measuring a working load at each support point by means of load measuring means installed in the second bridge bearing. . The method of claim 5, wherein the deviation between the simple plane between the reference plane and the superstructure in accordance with the thickness change value of the elastic body corresponding to the calculated difference value or a new simple plate further interposed between the reference plane and the superstructure And a second measuring step of measuring the load of the superstructure at each of the supporting points.