Steel box girder construction longitudinal slope sliding adjustable device and correction method

Abstract

The present application relates to the field of steel structure bridge construction, and discloses a kind of steel box girder construction longitudinal slope slide correction method. By setting upper tension device and lower thrust device on the upper side and lower side of the steel box girder to be corrected, the upper side and lower side of the steel box girder to be corrected are connected with the installed steel box girder. In the process of day and night alternation and temperature change, the upper tension device and lower thrust device are used to limit the upper and lower parts of the steel box girder to be corrected, so as to make the steel box girder expand along the slope and contract along the slope. Through multiple contraction and expansion along the slope, the purpose of correcting the steel box girder slide is achieved. The traditional steel box girder correction process is complex and difficult to solve. The device has a simple operation process and does not use large mechanical equipment, which is more economical and reasonable for the overall correction of the steel box girder slide, and can solve similar construction problems. It greatly improves the work efficiency, reduces the mechanical cost, labor cost and does not affect the project period.

Description

Technical Field

[0001] This invention relates to the field of steel structure bridge construction, specifically to an adjustable longitudinal slope correction device and method for steel box girder construction. Background Technology

[0002] Steel structure bridges are a common structural form in current municipal and highway engineering projects. During the construction of any project, various installation deviations are inevitable. Compared with other concrete bridge structures, steel structures have many advantages, with faster construction progress and easier correction being the most significant characteristics.

[0003] The longitudinal slope of most steel structure bridges is between 3% and 5%, with expansion joints between spans. Steel box girders are assembled on supports, and after installation, slippage may occur for various reasons. This slippage causes excessively large or small gaps at the joints between spans, preventing the expansion joints from being installed as designed, necessitating correction. Currently, the industry practice when this occurs is to cut or hoist the steel box girder down to address the issue, which is difficult, increases construction costs, and affects the construction schedule. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, an adjustable device and correction method for longitudinal slope slippage during steel box girder construction are provided. This method utilizes the diurnal temperature difference and the thermal expansion principle of the steel box girder to move the steel box girder upwards along the slope, thereby correcting the slippage of the steel box girder.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] An adjustable longitudinal slope sliding device for steel box girder construction, characterized in that: it includes an upper tension device and a lower thrust device, the upper tension device is installed between the steel box girder to be corrected and the upper side already installed steel box girder, and the lower thrust device is installed between the steel box girder to be corrected and the lower side already installed steel box girder;

[0007] The upper tensioning device includes a stop block, a connecting and transferring bracket, and a limiting component. The stop block is fixed on the steel box girder to be corrected and the upper steel box girder already installed. One end of the connecting and transferring bracket is fixed on the stop block of the steel box girder to be corrected, and a lifting surface is provided at the other end of the connecting and transferring bracket. One end of the limiting component is fixed on the stop block of the upper steel box girder already installed, and the other end faces the lifting surface. The stop block of the upper steel box girder already installed is located between the lifting surface and the steel box girder to be corrected.

[0008] The lower thrust device includes a stop block and a limiting component. The stop block is fixed on the steel box girder to be corrected and the lower steel box girder already installed. The lower end of the limiting component is fixed on the stop block of the steel box girder to be corrected, and the upper end of the limiting component abuts against the stop block of the lower steel box girder already installed.

[0009] According to the above technical solution, the blocks of the upper tension device and the lower thrust device are both arranged on the upper surface of the steel box girder; or the blocks of the upper tension device and the lower thrust device are both arranged on the same side of the steel box girder.

[0010] According to the above technical solution, the limit component adopts a jack.

[0011] According to the above technical solution, the limiting component adopts a limiting seat and a limiting block. One end of the limiting seat is fixed on the upper tension device on the stop block of the steel box girder to be corrected, and the lower thrust device is fixed on the stop block of the lower steel box girder that has been installed. The limiting seat is provided with a groove along the slope upward. The limiting block is set in a variety of sizes and specifications. The size and specifications of the limiting block are selected according to the correction amount of the steel box girder to be corrected.

[0012] A method for correcting longitudinal slope slippage during steel box girder construction, characterized by the following steps:

[0013] S1: Install an upper tension device and a lower thrust device on the upper and lower sides of the steel box girder to be corrected, respectively;

[0014] S2: Select two time points with large day-night temperature differences as the construction period, namely the high temperature point and the low temperature point;

[0015] S3: By adjusting the length of the limiting component, during the thermal expansion phase from a low temperature point to a high temperature point, the lower thrust device is used as the downward limit for the steel box girder to be corrected; during the cold contraction phase from a high temperature point to a low temperature point, the upper tension device is used as the downward limit for the corrected steel box girder; this cycle continues until the position of the steel box girder to be corrected is adjusted to the design position.

[0016] S4: Fix the steel box girder to be corrected, which has been adjusted to the design position, to the bottom pier, and then disassemble the upper tension device and the lower thrust device.

[0017] According to the above technical solution, in step S3, the limiting component uses a jack, including the following steps:

[0018] S31: Measure the length L of the steel box girder to be corrected that needs to be adjusted upwards along the slope;

[0019] S32: Estimate the expansion amount 'a' of the steel box girder to be corrected due to the temperature difference between the high and low temperature points during the construction season;

[0020] S33: Based on the length L and the expansion a, calculate the number of adjustments n required, where one adjustment is made from the high temperature point to the low temperature point, and another adjustment is made from the low temperature point to the high temperature point.

[0021] S34: In the previous adjustments, both ends of the jacks that act as the upper or lower tension devices for the downward limit of the steel box girder to be corrected are abutted against the stop blocks or lifting surfaces; in the final correction process, the length of the jacks is adjusted according to the remaining adjustment amount of the steel box girder to be corrected, and the jacks do not need to be adjusted at this time.

[0022] According to the above technical solution, in step S33, the adjustment amount of the steel box girder to be corrected in the first adjustment is 'a', and in the remaining n-1 adjustments, the extension of the jack is increased each time. in

[0023] According to the above technical solution, in step S33, the adjustment amount of the steel box girder to be corrected in the first n-1 adjustments is a, and in the nth adjustment, the extension of the jack is l-(n-1)a, where l-(n-1)a <a。

[0024] According to the above technical solution, in step S3, the limiting component adopts a limiting seat and a limiting block, including the following steps:

[0025] S31: Measure the length L that the steel box girder to be corrected needs to be adjusted upwards along the slope, and the distance b between the steel box girder to be corrected and the steel box girder already installed on the lower side, and make limiting blocks with lengths of L and b;

[0026] S32: Estimate the expansion amount 'a' of the steel box girder to be corrected due to the temperature difference between the high and low temperature points during the construction season;

[0027] S33: Based on the length L, expansion a, and spacing b, select multiple limiting blocks of different lengths, where the length difference between adjacent limiting blocks is less than a, and the minimum length of the limiting block is b.

[0028] S34: Install a limiting block of length b in the lower thrust device, and then install limiting blocks in the upper tension device and the lower thrust device in an alternating pattern of increasing size.

[0029] The present invention has the following beneficial effects:

[0030] By installing an upper tension device and a lower thrust device on the upper and lower sides of the steel box girder to be corrected, the upper and lower sides of the steel box girder to be corrected are connected to the already installed steel box girder.

[0031] When the temperature is low during the day, the length of the limiting components in the upper tension device and the lower thrust device is adjusted to limit the downward sliding of the steel box girder. As the temperature rises, the steel box girder expands thermally. During this process, because the bottom of the steel box girder is limited by the lower thrust device, the steel box girder expands upward along the slope due to heat, thereby achieving the purpose of adjusting the steel box girder as a whole upward. When the temperature reaches a high point during the day, the position of the steel box girder is measured to see if it has reached the design position. If the steel box girder has reached the preset position, it is fixed to the bottom pier.

[0032] If the steel box girder does not reach the preset position, due to the thermal expansion after the above process, the connecting transmission bracket of the upper tension device moves up the slope with the steel box girder to be corrected. The end of the limiting component of the upper tension device is not attached to the lifting surface. At this time, the limiting component is placed on the lifting surface. As the temperature drops, the upper tension structure limits the upper part of the steel box girder, and the steel box girder is pre-cooled and moves up the slope.

[0033] Based on the above measures, during the alternation of day and night and temperature changes, the upper tension device and lower thrust device limit the upper and lower parts of the steel box girder to be corrected, causing the steel box girder to expand and contract upwards along the slope due to heat and cold. Through multiple cycles of upward expansion and contraction, the purpose of correcting the slippage of the steel box girder is achieved. This solves the problems of complexity and difficulty in traditional steel box girder correction processes. This device is simple to operate, does not use large mechanical equipment, and is more economical and reasonable for the overall correction of slippage of steel box girders. It can solve similar construction problems, greatly improve work efficiency, reduce machinery and labor costs, and does not affect the project schedule. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the upper tension device provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the lower thrust device provided in an embodiment of the present invention;

[0037] In the diagram, 1. Upper tension device; 2. Lower thrust device; 3. Steel box girder to be corrected; 4. Steel box girder already installed on the upper side; 5. Steel box girder already installed on the lower side; 6. Stop block; 7. Connecting and transferring support; 8. Limiting component; 9. Pier column. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Reference Figures 1-3 As shown, the present invention provides an adjustable longitudinal slope device for steel box girder construction.

[0040] Example 1

[0041] It includes an upper tension device 1 and a lower thrust device 2. The upper tension device is installed between the steel box girder 3 to be corrected and the upper installed steel box girder 4, and the lower thrust device is installed between the steel box girder to be corrected and the lower installed steel box girder 5. The upper and lower installed steel box girders refer to steel box girders that have been fixedly installed on the pier 9, while the steel box girder to be corrected refers to a steel box girder that has not been fixed on the pier and has slipped.

[0042] The upper tensioning device includes a stop block 6, a connecting and transmitting bracket 7, and a limiting component 8. The stop block is fixed on the steel box girder to be corrected and the upper steel box girder already installed. One end of the connecting and transmitting bracket is fixed on the stop block of the steel box girder to be corrected, and a lifting surface is provided at the other end of the connecting and transmitting bracket. One end of the limiting component is fixed on the stop block of the upper steel box girder already installed, and the other end faces the lifting surface. The stop block of the upper steel box girder already installed is located between the lifting surface and the steel box girder to be corrected.

[0043] The lower thrust device includes a stop block 6 and a limiting component 8. The stop block is fixed on the steel box girder to be corrected and the lower side of the steel box girder already installed. The lower end of the limiting component is fixed on the stop block of the steel box girder to be corrected, and the upper end of the limiting component abuts against the stop block of the lower side of the steel box girder already installed.

[0044] In this embodiment, an upper tension device and a lower thrust device are respectively installed on the upper and lower sides of the steel box girder to be corrected, so that the upper and lower sides of the steel box girder to be corrected are connected to the already installed steel box girder.

[0045] When the temperature is low during the day, the length of the limiting components in the upper tension device and the lower thrust device is adjusted to limit the downward sliding of the steel box girder. As the temperature rises, the steel box girder expands thermally. During this process, because the bottom of the steel box girder is limited by the lower thrust device, the steel box girder expands upward along the slope due to heat, thereby achieving the purpose of adjusting the steel box girder as a whole upward. When the temperature reaches a high point during the day, the position of the steel box girder is measured to see if it has reached the design position. If the steel box girder has reached the preset position, it is fixed to the bottom pier.

[0046] If the steel box girder does not reach the preset position, due to the thermal expansion after the above process, the connecting transmission bracket of the upper tension device moves up the slope with the steel box girder to be corrected. The end of the limiting component of the upper tension device is not attached to the lifting surface. At this time, the limiting component is placed on the lifting surface. As the temperature drops, the upper tension structure limits the upper part of the steel box girder, and the steel box girder is pre-cooled and moves up the slope.

[0047] Based on the above measures, during the alternation of day and night and temperature changes, the upper tension device and lower thrust device limit the upper and lower parts of the steel box girder to be corrected, causing the steel box girder to expand and contract upwards along the slope due to heat and cold. Through multiple cycles of upward expansion and contraction, the purpose of correcting the slippage of the steel box girder is achieved. This solves the problems of complexity and difficulty in traditional steel box girder correction processes. This device is simple to operate, does not use large mechanical equipment, and is more economical and reasonable for the overall correction of slippage of steel box girders. It can solve similar construction problems, greatly improve work efficiency, reduce machinery and labor costs, and does not affect the project schedule.

[0048] Example 2

[0049] When the structure and principle of Embodiment 2 are similar to those of Embodiment 1, the difference lies in that a preferred stop block fixing position is provided. The stops of the upper tension device and the lower thrust device are evenly distributed on the upper surface of the steel box girder; or the stops of the upper tension device and the lower thrust device are evenly distributed on the same side of the steel box girder.

[0050] In this embodiment, preferably, the limiting component is a jack. Using a jack allows for continuous dimensional adjustment during the adjustment process, meeting the needs of various correction dimensions.

[0051] In this embodiment, preferably, the limiting component can also be a limiting seat and a limiting block. One end of the limiting seat is fixed to the upper tension device on the stop block of the steel box girder to be corrected, and the lower thrust device is fixed to the stop block of the lower steel box girder that has been installed. The limiting seat is provided with a groove that slopes upward. The limiting block is provided with various sizes and specifications, and the size and specifications of the limiting block are selected according to the correction amount of the steel box girder to be corrected.

[0052] In this embodiment, by selecting the length of the limiting block, the adjustment distance of the steel box girder to be corrected each time is controlled. After changing the size of the limiting block of the upper tension device and the lower thrust device multiple times, the steel box girder to be corrected is adjusted to the design position.

[0053] The present invention also provides a method for correcting longitudinal slope slippage during the construction of steel box girders.

[0054] Example 1

[0055] Includes the following steps:

[0056] S1: Install an upper tension device and a lower thrust device on the upper and lower sides of the steel box girder to be corrected, respectively;

[0057] S2: Select two time points with large day-night temperature differences as the construction period, namely the high temperature point and the low temperature point;

[0058] S3: By adjusting the length of the limiting component, during the thermal expansion phase from a low temperature point to a high temperature point, the lower thrust device is used as the downward limit for the steel box girder to be corrected; during the cold contraction phase from a high temperature point to a low temperature point, the upper tension device is used as the downward limit for the corrected steel box girder; this cycle continues until the position of the steel box girder to be corrected is adjusted to the design position.

[0059] S4: Fix the steel box girder to be corrected, which has been adjusted to the design position, to the bottom pier, and then disassemble the upper tension device and the lower thrust device.

[0060] Example 2

[0061] When the steps and principles of Example 2 are similar to those of Example 1, the difference lies in that: in step S3, the limiting component uses a jack, including the following steps:

[0062] S31: Measure the length L of the steel box girder to be corrected that needs to be adjusted upwards along the slope;

[0063] S32: Estimate the expansion amount 'a' of the steel box girder to be corrected due to the temperature difference between the high and low temperature points during the construction season;

[0064] S33: Based on the length L and the expansion a, calculate the number of adjustments n required, where one adjustment is made from the high temperature point to the low temperature point, and another adjustment is made from the low temperature point to the high temperature point.

[0065] S34: In the previous adjustments, both ends of the jacks that act as the upper or lower tension devices for the downward limit of the steel box girder to be corrected are abutted against the stop blocks or lifting surfaces; in the final correction process, the length of the jacks is adjusted according to the remaining adjustment amount of the steel box girder to be corrected, and the jacks do not need to be adjusted at this time.

[0066] Based on Example 2, two implementation methods are given;

[0067] First, in step S33, the adjustment amount of the steel box girder to be corrected in the first adjustment is 'a', and in the remaining n-1 adjustments, the extension of the jack is increased each time. in In this embodiment, when the temperature is low, the jack of the lower thrust device is pressed against the stop block on the lower side where the steel box girder has been installed. During this adjustment process, the adjustment amount of the steel box girder to be corrected is 'a'. In the remaining n-1 adjustments, the jack of the upper tension device or the lower thrust device, which serves as the lower limit for downward movement, is extended each time. At this point, the movable end of the jack is not against the stop block or the lifting surface, but it can be ensured that the adjustment amount will be constant during the remaining n-1 adjustments. This allows for effective adjustment of the steel box girder.

[0068] Second, in step S33, the adjustment amount for the steel box girder to be corrected in the previous n - 1 times is a, and in the nth adjustment, the jack is extended by l - (n - 1)a, where l - (n - 1)a < a. That is, in this embodiment, when the temperature is relatively low, the jack of the lower thrust device is abutted against the stop block of the steel box girder already installed on the lower side. In the previous n - 1 adjustment processes, the adjustment amount for the steel box girder to be corrected is a each time. In the nth adjustment, the jack of the upper tension device or the lower thrust device serving as the downward sliding limit is extended by l - (n - 1)a. At this time, the movable end of the jack does not abut against the stop block or the jacking surface, but it can ensure that the adjustment amount in the nth adjustment process is l - (n - 1)a, thereby realizing the effective adjustment of the steel box girder.

[0069] Embodiment 3

[0070] When the steps and principles of Embodiment 3 are close to the structure and principles of Embodiment 1, the differences are as follows: In step S3, the limiting component adopts a limiting seat and a limiting block, including the following steps:

[0071] S31: Measure the length L that the steel box girder to be corrected needs to be adjusted upward along the slope, and the distance b between the steel box girder to be corrected and the steel box girder already installed on the lower side, and manufacture limiting blocks with lengths of L and b;

[0072] S32: Estimate the expansion amount a of the steel box girder to be corrected caused by the temperature difference between the high temperature point and the low temperature point during the construction season;

[0073] S33: According to the length L, the expansion amount a, and the distance b, select multiple limiting blocks with different lengths, and the length difference between adjacent length limiting blocks is less than a, where the minimum length of the limiting block is b;

[0074] S34: Install a limiting block with a length of b in the lower thrust device, and then install the limiting blocks in the upper tension device and the lower thrust device in a staggered manner from small to large according to the size.

[0075] In this embodiment, when the temperature is relatively low, the limiting block with a length of b is installed on the lower thrust device. Subsequently, when the temperature is relatively high, a limiting block with a length greater than b is installed in the upper tension device. When the temperature is relatively low for the second time, a larger limiting block is installed on the lower thrust device until the installation of the limiting block with a length of L, thereby realizing the effective adjustment of the steel box girder.

[0076] The working principle of the present invention:

[0077] For example, the thermal expansion coefficient of Q345 steel: 10.6×10 to the -6th power / K (when at 20°C). For example, the length of the box girder is 96m, the day-night temperature difference is 15°C, and the theoretical thermal expansion is 15.2mm. If the correction length of the expansion joint between the connected lengths is 50mm, using the temperature difference correction method, the box girder can be corrected after 4 operations.

[0078] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An adjustable longitudinal slope device for steel box girder construction, characterized in that: It includes an upper tension device and a lower thrust device. The upper tension device is installed between the steel box girder to be corrected and the upper steel box girder that has already been installed, and the lower thrust device is installed between the steel box girder to be corrected and the lower steel box girder that has already been installed. The upper tensioning device includes a stop block, a connecting and transferring bracket, and a limiting component. The stop block is fixed on the steel box girder to be corrected and the upper steel box girder already installed. One end of the connecting and transferring bracket is fixed on the stop block of the steel box girder to be corrected, and a lifting surface is provided at the other end of the connecting and transferring bracket. One end of the limiting component is fixed on the stop block of the upper steel box girder already installed, and the other end faces the lifting surface. The stop block of the upper steel box girder already installed is located between the lifting surface and the steel box girder to be corrected. The lower thrust device includes a stop block and a limiting component. The stop block is fixed on the steel box girder to be corrected and the lower steel box girder already installed. The lower end of the limiting component is fixed on the stop block of the steel box girder to be corrected, and the upper end of the limiting component abuts against the stop block of the lower steel box girder already installed.

2. The adjustable longitudinal slope device for steel box girder construction according to claim 1, characterized in that: The blocks of the upper tension device and the lower thrust device are evenly distributed on the upper surface of the steel box girder; or the blocks of the upper tension device and the lower thrust device are evenly distributed on the same side of the steel box girder.

3. The adjustable longitudinal slope device for steel box girder construction according to claim 1, characterized in that: The limit component uses a jack.

4. The adjustable longitudinal slope device for steel box girder construction according to claim 1, characterized in that: The limiting component uses a limiting seat and a limiting block. One end of the limiting seat is fixed to the upper tension device on the stop block of the steel box girder to be corrected, and the lower thrust device is fixed to the stop block of the lower steel box girder that has been installed. The limiting seat is provided with a groove that slopes upward. The limiting block is set in a variety of sizes and specifications. The size and specifications of the limiting block are selected according to the correction amount of the steel box girder to be corrected.

5. A method for correcting longitudinal slope slippage during steel box girder construction, characterized in that: The method employing the adjustable longitudinal slope device for steel box girder construction as described in any one of claims 1-4 includes the following steps: S1: Install an upper tension device and a lower thrust device on the upper and lower sides of the steel box girder to be corrected, respectively; S2: Select two time points with large day-night temperature differences as the construction period, namely the high temperature point and the low temperature point; S3: By adjusting the length of the limiting component, during the thermal expansion phase from a low temperature point to a high temperature point, the lower thrust device is used as the downward limit for the steel box girder to be corrected; during the cold contraction phase from a high temperature point to a low temperature point, the upper tension device is used as the downward limit for the corrected steel box girder; this cycle continues until the position of the steel box girder to be corrected is adjusted to the design position. S4: Fix the steel box girder to be corrected, which has been adjusted to the design position, to the bottom pier, and then disassemble the upper tension device and the lower thrust device.

6. The method for correcting longitudinal slope slippage during steel box girder construction according to claim 5, characterized in that: In step S3, the limiting component uses a jack, including the following steps: S31: Measure the length L of the steel box girder to be corrected that needs to be adjusted upwards along the slope; S32: Estimate the expansion amount 'a' of the steel box girder to be corrected due to the temperature difference between the high and low temperature points during the construction season; S33: Based on the length L and the expansion a, calculate the number of adjustments n required, where one adjustment is made from the high temperature point to the low temperature point, and another adjustment is made from the low temperature point to the high temperature point. S34: In the previous adjustments, both ends of the jacks that act as the upper or lower tension devices for the downward limit of the steel box girder to be corrected are abutted against the stop blocks or lifting surfaces; in the final correction process, the length of the jacks is adjusted according to the remaining adjustment amount of the steel box girder to be corrected, and the jacks do not need to be adjusted at this time.

7. The method for correcting longitudinal slope slippage during steel box girder construction according to claim 6, characterized in that: In step S33, the adjustment amount of the steel box girder to be corrected in the first adjustment is 'a', and in the remaining n-1 adjustments, the extension of the jack is increased each time. ,in .

8. The method for correcting longitudinal slope slippage during steel box girder construction according to claim 6, characterized in that: In step S33, the adjustment amount of the steel box girder to be corrected in the first n-1 adjustments is 'a', and in the nth adjustment, the extension of the jack is... ,in .

9. The method for correcting longitudinal slope slippage during steel box girder construction according to claim 6, characterized in that: In step S3, the limiting assembly uses a limiting seat and a limiting block, including the following steps: S31: Measure the length L that the steel box girder to be corrected needs to be adjusted upwards along the slope, and the distance b between the steel box girder to be corrected and the steel box girder already installed on the lower side, and make limiting blocks with lengths of L and b; S32: Estimate the expansion amount 'a' of the steel box girder to be corrected due to the temperature difference between the high and low temperature points during the construction season; S33: Based on the length L, expansion a, and spacing b, select multiple limiting blocks of different lengths, where the length difference between adjacent limiting blocks is less than a, and the minimum length of the limiting block is b. S34: Install a limiting block of length b in the lower thrust device, and then install limiting blocks in the upper tension device and the lower thrust device in an alternating pattern of increasing size.

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