Slab replacement construction support method and slab replacement construction support system

Abstract

To provide a support method for slab replacement construction which can estimate deflection amounts of a bridge 10 according to construction positions.SOLUTION: A support method for slab replacement construction is a support method for removing existing slabs of a bridge 10 and for installing new slabs to the bridge 10. The support method is to: use a theoretical formula that calculates estimated deflection amounts of the bridge 10 according to positions where a crane for lifting existing slabs and new slabs is placed on the bridge 10, and calculate an estimated deflection amount in the case the crane is placed at a first position; actually place a crane at the first position, remove an existing slab and install a new slab, then measure a first actual height of the new slab; generate a first correction data that corrects the estimated deflection amount to have the difference between the estimated height of the new slab with the estimated deflection amount and the first actual height minimized; and calculate a post-correction estimated deflection amount for the case of placing a crane not at the first position but at a second position based on the theoretical formula and the first correction data.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for supporting deck replacement work. [Background technology]

[0002] Conventionally, "deck replacement work" has been carried out in various places, in which concrete decks of road bridges are removed and erected during highway renewal work, etc. In such bridge deck replacement work, concrete precast decks manufactured in factories or on-site yards are used in order to shorten the construction period (for example, Patent Document 1).

[0003] In deck replacement work, the construction crane is installed on the deck of the bridge girder, so the girder that receives the load of the crane experiences different displacements at each span. Even for the same span, the deflection and warping of the girder changes depending on where the crane is installed. Therefore, when measuring the completed form, the construction height of the new deck is managed taking into account the displacement calculated in advance by frame analysis, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-31902 Summary of the Invention [Problem to be solved by the invention]

[0005] However, displacement analyses such as frame analysis require a long time before the results can be calculated, and if the amount of construction work per day changes due to a problem, the results of the analysis may no longer be usable.

[0006] Therefore, the present invention provides a method and device for supporting deck replacement work that can estimate the amount of bridge deflection in accordance with the construction position. [Means for solving the problem]

[0007] The present invention has been made to solve at least some of the above-mentioned problems, and can be realized in the following aspects or application examples.

[0008] [1] One aspect of the method for supporting deck replacement work according to the present invention is to A method for supporting bridge deck replacement work in which an existing bridge deck is removed and a new bridge deck is installed on the bridge, comprising: Calculating the estimated deflection of the bridge when the crane is installed in a first position using a theoretical formula for calculating an estimated deflection of the bridge depending on the position at which a crane is installed to hoist the existing deck and the new deck on the bridge; The crane is actually installed at the first position, the existing deck is removed, and a first actual height of the new deck is measured after the new deck is installed; generating first correction information for correcting the estimated deflection amount so that a difference between the estimated height of the new deck slab in the estimated deflection amount and the first actual height becomes smaller; The method is characterized in that a corrected estimated deflection amount is calculated using the theoretical formula and the first correction information when the crane is installed at a second position different from the first position.

[0009] [2] In the method for supporting the deck replacement work, The crane was actually installed at the second position, the existing deck was removed, and a new deck was installed. The second actual height of the newly constructed deck was measured, Second correction information may be further generated to correct the corrected estimated deflection amount so that a difference between the estimated height and the second actual height becomes smaller.

[0010] [3] In the method for supporting the deck replacement work, The first correction information or the second correction information may be a correction coefficient to be multiplied by the estimated deflection amount or the corrected estimated deflection amount.

[0011] [4] In the method for supporting the deck replacement work, The first correction information or the second correction information can include information for changing at least some of the parameters of the theoretical formula depending on the outside air temperature at the site where the new deck slab is actually to be installed.

[0012] [5] In the method for supporting the deck replacement work, The theoretical formula can be obtained by changing at least some of the parameters of the standard theoretical formula so that the initial deflection amount calculated using the standard theoretical formula created based on a model of the bridge modeled by 1D simulation approaches the analytical deflection amount calculated by performing frame analysis of the bridge.

[0013] [6] The support device for deck replacement work according to the present invention is A support device for deck replacement work in which an existing deck of a bridge is removed and a new deck is installed on the bridge, a calculation unit that calculates an estimated deflection amount of the bridge when the crane is installed at a first position by using a theoretical formula for calculating an estimated deflection amount of the bridge according to a position at which a crane is installed to hoist the existing deck and the new deck on the bridge; a display unit that displays the estimated deflection amount calculated by the calculation unit; Equipped with the calculation unit calculates a corrected estimated deflection amount in the case where the crane is installed at a second position different from the first position using first correction information and the theoretical formula, the first correction information correcting the estimated deflection amount generated so as to reduce a difference between an estimated height of the new deck slab based on the estimated deflection amount and a first actual height of the new deck slab after the crane is actually installed at the first position, the existing deck slab is removed, and the new deck slab is installed; The display unit displays the corrected estimated deflection amount at the second position. Effect of the Invention

[0014] According to the deck replacement work support method and support device of the present invention, the amount of bridge deflection can be estimated based on the construction position, so even workers who are unfamiliar with using frame analysis can install the new deck at an appropriate height. [Brief description of the drawings]

[0015] [Figure 1] FIG. 13 is a diagram showing a schematic diagram of displacement of girder height due to the load of a crane. [Diagram 2] 4 is a flowchart illustrating a method for obtaining a theoretical formula according to the present embodiment. [Diagram 3] 3 is a schematic diagram illustrating a bridge model and an estimated deflection amount according to the present embodiment. FIG. [Figure 4] 1 is a flowchart illustrating a method for supporting deck replacement work according to this embodiment. [Diagram 5] 13 is an example of an image displaying a calculated estimated amount of deflection. [Figure 6] FIG. 1 is a block diagram showing a schematic diagram of a support device for deck replacement work according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Note that the embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are necessarily essential components of the present invention.

[0017] 1. Outline of deck replacement work Fig. 1 is a diagram showing a schematic diagram of the displacement of the girder height due to the load L1 of a crane 14 (Fig. 5). Fig. 1 shows girder upper surfaces K1 and K2 of a steel girder 13 (Fig. 5) that is spanned across five piers 12, but the number of piers 12 is not limited to this.

[0018] As shown in FIG. 1, in a replacement work of a deck installed on a bridge 10 for renewal work of an expressway or the like, when a crane 14 for lifting the deck is installed on the bridge 10, the load L1 of the crane 14 deforms the girder upper surface K1 to the girder upper surface K2. In recent bridges 10, multiple girders 13 are placed between the supports of multiple piers 12 in the longitudinal direction of the bridge 10 (hereinafter simply referred to as the "longitudinal direction"), and a deck made of precast concrete is erected on the girders 13. In the case of a straight bridge, the longitudinal direction is a straight line, but in the case of a curved bridge, the longitudinal direction is the direction in which the main girders extend along the curve of the bridge 10. The bridge 10 is not limited to an expressway, and may be a bridge 10 on a general road or a railway. In addition, in the bridge 10, multiple girders 13 are provided at intervals in a direction perpendicular to the longitudinal direction (hereinafter simply referred to as the "perpendicular direction"). The bridge 10 is a steel bridge, and the girders 13 of the piers 12 are made of steel. The perpendicular direction in a curved bridge is a direction perpendicular to the tangent of the curved portion.

[0019] Since the girder 13 is bending downward or bulging upward between the piers 12, when erecting the new deck 16 (Fig. 5) in this state, it is desirable to install the new deck 16 on the assumption that the crane 14 will be removed after construction and the height of the girder top surface K1 before deformation will be restored, for example. In other words, rather than installing the new deck 16 at the designed height during construction, it is desirable to perform as-built management while adjusting the height of the new deck 16 so that the girder top surface K2 will be at the designed flat height when it returns to the girder top surface K1 after construction.

[0020] The deck replacement work is a work for improving the durability and extending the life of the deck by replacing the existing deck 15 (Fig. 5) of the bridge 10, which has deteriorated due to aging or salt damage, with a new deck 16 made of precast concrete. The new deck 16 is a rectangular plate in plan view, elongated in the perpendicular direction. In the deck replacement work, the existing deck 15 is lifted and removed from the girder 13 by the crane 14, and a new deck is installed by the crane 14 in the part of the girder 13 where the deck is no longer there. The crane 14 is placed on the existing deck 15, and when the deck replacement work is completed within the range that can be lifted by the crane 14, the crane 14 retreats on the existing deck 15 and moves to the next construction position. The new deck 16 is installed in a state where it is adjusted to an appropriate height according to the girder top surface K2. The new deck 16 is also joined to the adjacent new deck 16 that has already been constructed.

[0021] 2. Support methods for deck replacement work The method of supporting deck replacement work according to this embodiment will be described with reference to Figures 2 to 5. Figure 2 is a flow chart explaining the method of obtaining a theoretical formula according to this embodiment, Figure 3 is a schematic diagram explaining the bridge model 10a and the estimated deflection amount according to this embodiment, Figure 4 is a flow chart explaining the method of supporting deck replacement work according to this embodiment, and Figure 5 is an example of an image 30 displaying the calculated estimated deflection amount.

[0022] The method for supporting the deck replacement work is a method for supporting the work of removing the existing deck 15 of the bridge 10 and installing a new deck 16 on the bridge 10.

[0023] 2-1. How to obtain the theoretical formula As shown in Fig. 2, the theoretical formula used in the method for supporting deck replacement construction includes, for example, a step (S10) of inputting a reference theoretical formula, a step (S12) of calculating an initial deflection amount, a step (S14) of minimizing an error, and a step (S16) of acquiring a theoretical formula. Each step can be executed by, for example, a support device 20 (Fig. 6) equipped with a calculation unit 26 described later.

[0024] S10: The step of inputting the reference formula can create a reference theoretical formula based on a bridge model 10a (FIG. 3) in which the bridge 10 is modeled by, for example, 1D simulation, and input the reference theoretical formula to the support device 20 or an external computing device. The reference theoretical formula can calculate an estimated deflection amount of the bridge 10 according to the position where the crane 14 for lifting the existing deck 15 and the new deck 161 is installed on the bridge 10. It is preferable that the reference theoretical formula is created based on a simplified model by 1D simulation, rather than a complicated structural analysis such as a so-called frame analysis. For example, the bridge 10 can be modeled as a bridge model 10a in which a single girder model 13a or multiple girder models 13a are connected to the span as shown in FIG. 3. Since the distance from the support position 17a affects the rigidity of the actual girder 13, it is preferable to use multiple girder models 13a with different rigidities. By changing multiple parameters such as the length, cross-sectional area, specific gravity, and bending rigidity of each girder model 13a, the deformation of the girder model 13a against the load can be made closer to that of the actual bridge 10. The bridge model 10a can be created using a beam model of commercially available 1D simulation software such as Dymola, Simcenter Amesim, Simscape, OpenModelica, and SimulationX.

[0025] S12: The step of calculating the initial deflection calculates the initial deflection that occurs when a load is applied to a specified coordinate using the reference theoretical formula input in S10, for example, by using the support device 20 described later or an external computing device. The specified coordinate is the load position in the frame analysis compared in S14, and the load is the load from the crane 14 that is also used in the frame analysis. The multiple parameters used in the reference theoretical formula can be obtained from the design information of the bridge 10.

[0026] S14: The step of minimizing the error involves changing at least some of the parameters of the standard theoretical formula to obtain a theoretical formula so that the initial deflection amount calculated using the standard theoretical formula approaches the analytical deflection amount calculated by performing frame analysis on the bridge 10. Frame (FRAME) analysis is generally adopted in the civil engineering field, and is calculated using a structural analysis program that uses a three-dimensional finite element model that is more complicated than the above-mentioned simple model for the bridge 10. The analytical deflection amount can be calculated with high accuracy by detailed analysis, but frame analysis that requires many input items is generally performed only once for one bridge 10. If the position on the bridge 10 where the load L1 of the crane 14 is applied is changed from the plan depending on the daily construction situation, the frame analysis result at the different position cannot be used as it is. And frame analysis is not easy enough to perform analysis again every time the plan is changed, and costs are incurred. In this step, the difference between the initial deflection amount and the analytical deflection amount is obtained, and some parameters used in the reference theoretical formula, such as the stiffness, specific gravity, and spring constant at the support position 17a of the girder model 13a, are changed so that the difference becomes smaller. This step may be executed by a support device 20 (described later) equipped with an AI algorithm. For example, the AI ​​algorithm may learn which parameter (or combination of parameters) is important to change in order to reduce the error between the initial deflection amount and the analytical deflection amount, and automatically search for optimal parameters for the bridge model 10a. As a method of minimizing the error, there are multiple locations where errors occur in the longitudinal direction of the bridge 10, and the maximum value may be obtained from among these multiple errors, and this maximum value may be minimized. In addition, the method of minimizing the error may be, for example, a method of minimizing multiple errors simultaneously, or may be a method of minimizing the error by taking the RMS (effective value), or may be a method of minimizing the error by taking the root mean square of multiple errors. Then, a theoretical formula in which at least some parameters of the reference theoretical formula are changed can be obtained by S14.

[0027] S16: The process of obtaining a theoretical formula executes S14 to obtain a theoretical formula that can calculate an estimated deflection amount with an accuracy closer to that of frame analysis. With the theoretical formula obtained in S16, it is possible to calculate an estimated deflection amount in the bridge 10 by specifying, for example, the position where the crane 14 is to be installed, the existing deck 15 to be removed, and the new deck 16 to be installed, as described later. Therefore, calculations can be performed in a short time with fewer conditions input compared to conventional frame analysis.

[0028] 2-2. Calculation of estimated deflection after correction As shown in Fig. 3, the method for supporting deck replacement work includes a step (S20) of calculating an estimated deflection amount at a first position, a step (S22) of actually measuring a first actual height, a step (S24) of generating first correction information, and a step (S26) of calculating a corrected estimated deflection amount at a second position. As shown in the example of Fig. 3, the method for supporting deck replacement work can further include a step (S28) of actually measuring a second actual height and a step (S30) of generating second correction information.

[0029] S20: The step of calculating the estimated deflection amount at the first position uses a theoretical formula for calculating the estimated deflection amount of the bridge 10 according to the position where the crane 14 for hoisting the existing deck 15 and the new deck 16 is installed on the bridge 10, and calculates the estimated deflection amount when the crane 14 is installed at the first position. The theoretical formula can be the formula acquired in S16. The first position is an arbitrary position of the girder surface K1, for example, the crane installation position when the construction of the bridge 10 is started. For example, the coordinates of the girder surface K1, the existing deck 15 to be removed, and the new deck 16 to be installed are inputted into the theoretical formula. In addition, in S20, the load L1 of the crane 14, the load of the existing deck 15, the load of the new deck 16, etc. may be read out from the memory unit 28 of the support device 20 described later. The estimated deflection amount can be calculated as the displacement amount (mm) of the girder surface K2 at each position along the girder surface K1.

[0030] S22: The process of measuring the first actual height measures the first actual height of the new deck slab 16 after the crane 14 is actually installed at the first position, the existing deck slab 15 is removed, and the new deck slab 16 is installed. The first actual height may be the height of the girder top surface K2. The completed form management can be performed using the first actual height of the new deck slab 16 relative to the estimated height of the new deck slab 16 taking into account the estimated amount of deflection.

[0031] S24: The step of generating first correction information generates first correction information for correcting the estimated deflection amount so that the difference between the estimated height of the new deck 16 and the first actual height in the estimated deflection amount is reduced. The estimated height of the new deck 16 is calculated, for example, as a height obtained by subtracting the estimated deflection amount from the design height of the new deck 16. Since the theoretical formula can only calculate an estimated deflection amount that is close to the frame analysis result, an error may occur in the actual deflection amount after construction due to various unexpected causes. In order to reduce this error, it is desirable to obtain the first correction information in addition to the theoretical formula. The first correction information can be a correction coefficient that is multiplied by the estimated deflection amount calculated by the theoretical formula. Since it is difficult to identify all the causes of the error, the worker may mechanically set a numerical value that reduces the difference between the estimated height and the first actual height as a correction coefficient specific to the bridge 10 to be constructed. For example, if the error is -10%, the correction coefficient can be set to 0.9 and input from the operation unit 24 of the support device 20.

[0032] The first correction information of S24 may include information for changing at least some of the parameters of the theoretical formula according to the outside air temperature at the site where the new deck 16 is actually to be installed. For example, the outside air temperature and deflection of the bridge 10 to be constructed may be measured in advance, and relationship data between the outside air temperature and the deflection amount may be stored in the memory unit 28, and the data may be used to calculate a correction value according to the outside air temperature on the construction day or during the construction time period. In addition, the outside air temperature at the site may be input to a trained model that has been machine-learned using the outside air temperature and deflection amount of a bridge other than the target bridge as training data to obtain a correction value. Then, the outside air temperature at the site and the measured deflection amount are trained in the trained model. The data can be further input as training data and machine learning can be performed each time the construction location is changed. This makes it possible to generate a trained model adapted to the site.

[0033] S26: A step of calculating an estimated deflection amount at a second position calculates a corrected estimated deflection amount when the crane 14 is installed at a second position different from the first position using the theoretical formula corrected in S24 and the first correction information. The second position is, for example, a construction position adjacent to the first position. Since the corrected estimated deflection amount uses the first correction information, the error with the actual measurement result in S28 is smaller than the error at the first position. In addition, the estimated deflection amount may be calculated in a state where the existing deck slab 15 is removed, or in a state where the new deck slab 16 is installed.

[0034] S28: In the process of measuring the second actual height, the crane 14 is actually set up at the second position, the existing deck 15 is removed, and the second actual height of the new deck 16 is measured after the new deck 16 is installed. Since the amount of deflection changes if the position of the crane changes, it is preferable to calculate the estimated amount of deflection every time the crane 14 is moved.

[0035] S30: The step of generating the first correction information further generates second correction information for correcting the estimated deflection amount after correction so that the difference between the estimated height at the second position and the second actual height becomes smaller. The estimated height at the second position can be calculated, for example, by subtracting the estimated deflection amount after correction from the design height of the new deck 16. Since the estimated height at the second position takes into account the first correction information, the error with the second actual height is smaller than the error in the estimated height at the first position. Furthermore, if the estimated deflection amount at the third position, which is the next construction position, is calculated using the second correction information, the error becomes even smaller. The second correction information can be a correction coefficient to be integrated with the estimated deflection amount after correction. It is preferable to repeat S26, S28, and S30 at the positions to which the crane 14 moves after the second position. This is because the estimated deflection amount becomes more accurate. In addition, each time the theoretical formula is corrected in S30, the temperature or the like may be used as teacher data to evaluate the difference with the actual value and change the correction conditions while machine learning.

[0036] As shown in FIG. 5, the display unit 22 displays an image 30 showing the estimated deflection amount calculated by the calculation unit 26. In FIG. 5, the bridge 10 and the crane 14 are modeled and displayed on the upper side, and a graph is displayed on the lower side with the longitudinal direction of the bridge 10 on the horizontal axis and the estimated deflection amount on the vertical axis. FIG. 5 shows a model of the bridge 10 in which four piers 12 support four girders 13 (G1, G2, G3, G4) at positions P1, P2, P3, and P4 from A1. Note that, in this embodiment, four girders 13 are illustrated as an example, but the number of girders 13 can be displayed according to the actual main girders. The crane 14 is installed between the spans A1 and P1. The graph displays only the estimated deflection amount of the girder 13 G1. 0 mm on the vertical axis is, for example, a design value. In this embodiment, an example in which the crane 14 is installed at the center of the bridge 10 in the orthogonal direction (width direction) is described, but the crane 14 may be installed at a position other than the center without being limited thereto. For example, in the case of a bridge 10 with many lanes, the crane 14 may be moved not only in the longitudinal direction but also in the perpendicular direction. In such a case, the change in the load of the crane 14 borne by each girder 13 must be taken into consideration.

[0037] According to the method for supporting deck replacement work of this embodiment, the deflection amount of the bridge 10 can be estimated according to the construction position, so even workers who are unfamiliar with using general frame analysis that does not accommodate changes in the construction position can install the new deck 16 at an appropriate height. Furthermore, according to this support method, the estimated deflection amount according to the construction position can be calculated in a timely manner as the construction progresses.

[0038] 3. Support device for deck replacement work A support device 20 for deck replacement work according to this embodiment will be described with reference to Figs. 1 to 6. Fig. 6 is a block diagram showing a schematic diagram of the support device 20 for deck replacement work according to this embodiment. The assistance device 20 can execute the assistance method described above.

[0039] As shown in FIG. 6, the deck replacement work support device 20 is a device that supports the work of removing the existing deck 15 of the bridge 10 and installing a new deck 16 on the bridge 10.

[0040] The support device 20 includes a calculation unit 26 that calculates an estimated amount of deflection, and a display unit 22 that displays the estimated amount of deflection. The support device 20 may further include an operation unit 24 that accepts input operations to the support device 20, and a storage unit 28 that stores programs and the like. The display unit 22, the operation unit 24, the calculation unit 26, and the storage unit 28 are electrically connected to one another. The calculation unit 26 is a CPU (Central Processing Unit) and can execute programs stored in the storage unit 28.

[0041] The display unit 22 may be a display of a portable terminal such as a tablet PC or a smartphone, and the portable terminal may further include some or all of the functions of the support device 20, such as the calculation unit 26. The display unit 22 may be, for example, a liquid crystal screen (LCD (Liquid Crystal Display)), or may be other known display devices (for example, organic EL (Electro Luminescence)). The display unit 22 can display various user interfaces (GUI (Graphical User Interface)) for the operator. The operation unit 24 may be, for example, a touch panel type provided integrally with the display unit 22.

[0042] The calculation unit 26 calculates the estimated deflection of the bridge 10 when the crane 14 is installed at the first position, using a theoretical formula for calculating the estimated deflection of the bridge 10 according to the position where the crane 14 for hoisting the existing deck 15 and the new deck 16 is installed on the bridge 10. The estimated deflection is shown in a graph at the bottom of image 30 in Fig. 5 as the displacement of the girder top surface relative to the coordinates of the top surface of the girder 13 along the longitudinal direction. By displaying it as a graph, it is easy for the worker to recognize the change in the estimated deflection. For example, the numerical value of the estimated deflection at the position where the finger mark is displayed in image 30 may be displayed in a separate box.

[0043] The calculation unit 26 calculates a corrected estimated deflection amount when the crane 14 is installed at a second position different from the first position using first correction information and a theoretical formula that corrects the estimated deflection amount generated so as to reduce the difference between the estimated height of the new deck 16 in the estimated deflection amount and the first actual height of the new deck 16 after the crane 14 is actually installed at the first position, the existing deck 15 is removed, and the new deck 16 is installed. The calculation unit 26 can calculate the first correction information by executing the above-mentioned S24. Also, the calculation unit 26 can calculate the corrected estimated deflection amount by executing the above-mentioned S26.

[0044] The display unit 22 displays the estimated deflection calculated by the calculation unit 26. The display unit 22 also displays the estimated deflection at the second position. By displaying the estimated deflection on the display unit 22, the worker can easily recognize the estimated deflection. By installing the new deck 16 in accordance with this, as-built management can be performed.

[0045] According to the deck replacement work support device 20 of the present invention, the amount of deflection of the bridge 10 can be estimated according to the construction position, so that even workers who are unfamiliar with using general frame analysis that does not accommodate changes in the construction position can install the new deck 16 at an appropriate height.

[0046] The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the present invention includes substantially the same configuration as the configuration described in the embodiment (for example, a configuration having the same function, method, and result, or a configuration having the same purpose and effect). The present invention includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. The present invention also includes configurations that have the same effects as the configurations described in the embodiments or that can achieve the same purpose. The present invention also includes configurations in which publicly known technology is added to the configurations described in the embodiments. [Explanation of symbols]

[0047] 10...bridge, 10a...bridge model, 12...pier, 13...girder, 13a...girder model, 14...crane, 15...existing deck, 16...new deck, 17a...support position, 20...support device, 22...display unit, 24...operation unit, 26...calculation unit, 28...storage unit, 30...image, K1, K2...girder top surface, L1...load

Claims

1. A method for supporting bridge deck replacement work in which an existing bridge deck is removed and a new bridge deck is installed on the bridge, comprising: Calculating the estimated deflection of the bridge when the crane is installed in a first position using a theoretical formula for calculating an estimated deflection of the bridge depending on the position at which a crane is installed to hoist the existing deck and the new deck on the bridge; The crane is actually installed at the first position, the existing deck is removed, and a first actual height of the new deck is measured after the new deck is installed; generating first correction information for correcting the estimated deflection amount so that a difference between an estimated height of the new deck slab in the estimated deflection amount and the first actual height becomes smaller; A method for supporting deck replacement work, which uses the theoretical formula and the first correction information to calculate a corrected estimated deflection amount when the crane is installed at a second position different from the first position.

2. In the method for supporting deck replacement work according to claim 1, The crane is actually installed at the second position, the existing deck is removed, and a second actual height of the new deck is measured after the new deck is installed; A method for supporting deck replacement work, further generating second correction information that corrects the corrected estimated deflection amount so that the difference between the corrected estimated height and the second actual height becomes smaller.

3. In the method for supporting deck replacement work according to claim 2, A method for supporting deck replacement work, wherein the first correction information or the second correction information is a correction coefficient to be multiplied by the estimated deflection amount or the corrected estimated deflection amount.

4. In the method for supporting deck replacement work according to claim 2, A method for supporting deck replacement work, wherein the first correction information or the second correction information includes information for changing at least some of the parameters of the theoretical formula depending on the outside air temperature at the site where a new deck is actually to be installed.

5. In the method for supporting deck replacement work according to claim 1 or 2, The method for supporting deck replacement work includes obtaining the theoretical formula by changing at least some of the parameters of the standard theoretical formula so that an initial deflection amount calculated using the standard theoretical formula created based on a model of the bridge modeled by 1D simulation approaches an analytical deflection amount calculated by performing frame analysis of the bridge.

6. A support device for deck replacement work in which an existing deck of a bridge is removed and a new deck is installed on the bridge, a calculation unit that calculates an estimated deflection amount of the bridge when the crane is installed at a first position by using a theoretical formula for calculating an estimated deflection amount of the bridge according to a position at which a crane is installed to hoist the existing deck and the new deck on the bridge; a display unit that displays the estimated deflection amount calculated by the calculation unit; Equipped with the calculation unit calculates a corrected estimated deflection amount in the case where the crane is installed at a second position different from the first position using first correction information and the theoretical formula, the first correction information correcting the estimated deflection amount generated so as to reduce a difference between an estimated height of the new deck slab based on the estimated deflection amount and a first actual height of the new deck slab after the crane is actually installed at the first position, the existing deck slab is removed, and the new deck slab is installed; The display unit displays the corrected estimated deflection amount at the second position, providing a support device for deck replacement work.

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