Construction method of large-span curved bridge deck

Abstract

The application relates to a large-span curved bridge deck panel construction method, which comprises the following steps: obtaining survey data of an installation site and design drawing data of multiple steel beams, and establishing an entity installation model; a splicing jig frame corresponding to the multiple steel beams is established in the entity installation model, the splicing jig frame comprises an upper support, a jig frame and a pedestal from top to bottom; the installation parameters of the multiple splicing jig frames are adjusted, so that a simulated curve formed by splicing the steel beams on the splicing jig frame is consistent with a design curve; the installation parameters of the multiple splicing jig frames corresponding to the simulated curve are recorded to form splicing data; and the multiple steel beams are installed by using the splicing jig frame based on the splicing data. Therefore, the simulated installation parameters of the splicing jig frame are the same as the actual installation parameters, then the splicing jig frame is set according to the installation parameters, and the multiple steel beams are actually installed by using the splicing jig frame, so that the pre-camber and linearity of the large-span curved steel beam meet the design requirements, and the adjustment process is reduced.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a construction method for a long-span curved bridge deck. Background Technology

[0002] The construction of the Dezhou-Shangrao Expressway from the Jiangxi-Anhui border to Wuyuan section is an important part of the expressway network.

[0003] This section involves three steel-concrete I-beam bridges: Xinting Grand Bridge, Shimu Grand Bridge, and Huayuan Bridge. All three bridges have steel-concrete I-beam superstructures. The terrain in this project is highly undulating with steep slopes, making substructure construction challenging. Considering the terrain and other factors, the Xinting Grand Bridge and Shimu Grand Bridge were designed as curved bridges with a minimum curve radius of 1200m and a maximum pre-camber of 19.5cm. Compared to straight, long-span bridges, the pre-camber variation in this section is more sensitive, resulting in higher requirements for the completed bridge alignment.

[0004] Traditional bridge construction methods involve dividing the bridge into sections, manufacturing them in a factory, and then hoisting the steel beam sections to form a curved bridge. However, the hoisting process presents the following problems: (1) Due to the curved bridge mentioned above, the minimum radius of the curve is 1200m and the maximum pre-camber can reach 19.5cm. Compared with the straight long-span bridge, the pre-camber of this section is sensitive to changes and the requirements for the bridge alignment are high. This makes it necessary to make constant adjustments during the hoisting process. Furthermore, the load-bearing capacity of the hoisting equipment and the impact of high-altitude operations will affect the final forming effect.

[0005] (2) Environmental changes will also affect the formation of steel beam structures, especially changes in temperature and humidity. The internal cause is that thermal expansion and contraction cause changes in the steel beam structure. In addition, strong winds will affect the construction progress. Summary of the Invention

[0006] This application provides a construction method for a long-span curved bridge deck, which solves the problem in the related technology that it is difficult to accurately achieve the pre-camber requirements of long-span curved steel beams using traditional bridge erection methods.

[0007] Firstly, a construction method for long-span curved bridge decks is provided, which includes the following steps: Obtain on-site survey data and design drawings of multiple steel beams, and establish a physical installation model; In the physical installation model, a splicing frame is established to connect with the multiple steel beams. The splicing frame includes a top support, a frame, and a base from top to bottom. The installation parameters of multiple splicing jigs are adjusted so that the simulated curve formed by splicing steel beams on the splicing jig matches the design curve; the installation parameters include the top support extension amount, the setting coordinates of the platform, and the positioning lines on the platform; Record the installation parameters of multiple splicing jigs corresponding to the simulated curves to form splicing data; Based on the splicing data, multiple sections of the steel beam are installed using the splicing jig.

[0008] In some embodiments, establishing a splicing jig corresponding to the multiple steel beam segments in the physical installation model includes the following steps: The solid installation model is divided into multiple segments based on the curve, pre-camber, and cross slope of the overall steel beam. In the physical installation model, a splicing frame is established that corresponds one-to-one with the segmented parts.

[0009] In some embodiments, after installing multiple sections of the steel beam using the splicing jig based on the splicing data, the following steps are further included: Obtain local weather data for the construction site, including information on temperature changes, humidity changes, and wind season changes; Based on the weather data, the appropriate construction time for assembly is determined.

[0010] In some embodiments, based on the splicing data, multiple sections of the steel beam are installed using the splicing jig, including the following steps: Install and fix all the splicing frames according to the setting coordinates of the pedestal and the extension and retraction of the top support; The two steel beams of the first section are hoisted onto the splicing jig, and after the two steel beams are adjusted to be parallel to the positioning lines on the corresponding pedestals, they are temporarily fixed with guy ropes. Install inter-segment crossbeams between the two steel beams and remove the guy ropes; Repeat the above steps to install the inter-segment crossbeams of the remaining steel beams.

[0011] In some embodiments, after the two steel beams of the previous segment are hoisted, when hoisting the two steel beams of the next segment, one end of the two steel beams of the next segment is first inserted into the splicing plate joint of the two steel beams of the previous segment, and then the installation parameters of the splicing jig corresponding to the other end of the two steel beams of the next segment are adjusted. Use a total station to verify the position and elevation of the two steel beams in the next segment.

[0012] In some embodiments, after the crossbeams between all steel beam segments are connected, the entire steel beam alignment is remeasured using a total station. If the overall shape of the steel beam does not match the design curve, adjust the pedestal and top support; otherwise, install high-strength bolts on the entire steel beam.

[0013] In some embodiments, the installation and fixing of all the splicing frames according to the setting coordinates of the pedestal and the extension / retraction of the top support includes the following steps: Install all the splicing frames according to the set coordinates of the pedestal, and after each splicing frame is installed, adjust the top support in the corresponding splicing frame according to the top support extension amount. After all the splicing frames are installed, the elevation of the splicing frames and the horizontal distance between two adjacent splicing frames are verified and measured using a laser rangefinder.

[0014] In some embodiments, after all the splicing jigs have been installed and secured, and before the two steel beams of the first segment are hoisted onto the splicing jigs, the following steps are included: The specific steps for re-inspecting the steel beams are as follows: If there are burrs or welding spatter at the steel beam assembly points, they should be removed. If the steel beam is partially deformed during transportation but this does not affect the quality of the member, it should be adjusted by hammering, and a pad should be placed during the hammering.

[0015] In some embodiments, the positioning lines on the pedestal include a center line, and second marking lines are provided parallel to each other on both sides of the center line; the distance between the second marking lines is equal to the width of the steel beam, and the center line coincides with the central axis of the steel beam.

[0016] In some embodiments, the pedestal includes a concrete base and connecting stirrups, the connecting stirrups being connected to the jig; After all the spliced ​​jigs are fixed, the following steps are also included: Connect all the pedestals and cast them into a single structure.

[0017] The beneficial effects of the technical solution provided in this application include: This application provides a construction method for a long-span curved bridge deck. A physical installation model is established using survey data from the installation site and design drawings of multiple steel beam segments. Splicing jigs, corresponding to the multiple steel beam segments, are created within the physical installation model. Multiple splicing jigs are moved within the physical installation model, and steel beams are installed on them, ensuring that the simulated curve formed by the splicing of the steel beams matches the design curve. This ensures that the simulated installation parameters of the splicing jigs are identical to the actual installation parameters. The splicing jigs are then set according to these installation parameters, and the multiple steel beam segments are actually installed using the splicing jigs. This ensures that the pre-camber and linearity of the long-span curved steel beams meet design requirements, thereby reducing the need for adjustments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram illustrating the arrangement of multiple splicing tire frames provided in the embodiments of this application; Figure 2 This is a schematic diagram of the splicing frame provided in the embodiments of this application; Figure 3 A schematic diagram illustrating the curvature retesting of multiple spliced ​​jigs provided in the embodiments of this application; Figure 4 This is a schematic diagram of the positioning lines on the pedestal provided in an embodiment of this application; Figure 5 A schematic diagram illustrating the hoisting of two steel beams and the inter-segment crossbeam of the previous segment, provided for an embodiment of this application; Figure 6 This is a schematic diagram of the hoisting of two steel beams and the inter-segment crossbeam for the next segment, provided in an embodiment of this application.

[0020] In the diagram: 1. Splicing frame; 100. Platform; 101. Frame; 102. Top support. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] A construction method for large-span curved bridge decks is proposed to address the problem that traditional bridge erection methods often fail to accurately achieve the pre-camber requirements of large-span curved steel beams.

[0023] A construction method for a long-span curved bridge deck includes the following steps: Step S01: Obtain the survey data of the installation site and the design drawing data of multiple steel beams, and establish a physical installation model; Step S02: In the solid installation model, establish the splicing frame 1 that is connected to the multi-segment steel beam. The splicing frame 1 includes a top support 102, a frame 101 and a base 100 from top to bottom. Step S03: Adjust the installation parameters of multiple splicing jigs 1 so that the simulated curve formed by splicing steel beams on the splicing jigs 1 matches the design curve; the installation parameters include the expansion and contraction of the top support 102, the setting coordinates of the platform 100 and the positioning lines on the platform 100; that is, perform structural optimization so that the overall installation structure formed by multiple splicing jigs 1 conforms to the pre-camber and line shape of the steel beams.

[0024] Step S04: Record the installation parameters of multiple splicing jigs 1 corresponding to the simulation curve to form splicing data; Step S05: Based on the splicing data, install multiple steel beams using the splicing jig 1.

[0025] Through the above steps, a physical installation model was established using survey data from the installation site and design drawings of multiple steel beams. A splicing jig 1, corresponding to the multiple steel beams, was created within the physical installation model. Multiple splicing jigs 1 were moved within the physical installation model, and steel beams were installed on them to ensure that the simulated curve formed by the splicing of the steel beams matched the design curve. This ensured that the simulated installation parameters of the splicing jig 1 were identical to the actual installation parameters. The splicing jig 1 was then set according to these installation parameters, and multiple steel beams were actually installed using the splicing jig 1. This ensured that the pre-camber and linearity of the large-span curved steel beams met the design requirements, thereby reducing the adjustment process and accelerating the construction progress.

[0026] In some preferred embodiments, to facilitate the adjustment of the pre-camber and alignment of large-span curved steel beams, step S02 is configured as follows: Based on the overall steel beam's curve, pre-camber, and cross slope, each segment of the steel beam in the solid installation model is divided into multiple segments; a splicing jig 1 is then created in the solid installation model, corresponding one-to-one with each segment. This setup increases the number of adjustment points, allowing for more precise adjustments.

[0027] In some preferred embodiments, when performing structural optimization in step S03, an optimal point is not set, but an optimal range is set under the premise of ensuring structural safety, so as to provide an adjustable range for subsequent combinatorial optimization.

[0028] In some preferred embodiments, after installing multiple steel beams using the splicing jig 1 based on the splicing data, the following steps are also included: Obtain local weather data, including temperature, humidity, and wind patterns; based on the weather data, determine the optimal time for assembly.

[0029] In this embodiment, based on the local weather changes in recent years, especially the changes in temperature and humidity, an algorithm is used to evaluate the suitable date for assembly, so as to minimize the impact of factors such as high humidity in mountainous areas on the steel beam structure.

[0030] In some preferred embodiments, the following explanation is given for step S05, which involves installing multiple steel beams using the splicing jig 1 based on the splicing data: Step S050: Based on the set coordinates of the pedestal 100 and the extension / retraction of the top support 102, install and fix all the splicing jigs 1; refer to Figure 1 and Figure 2 Install all the splicing frames 1 according to the set coordinates of the pedestal 100, and after each splicing frame 1 is installed, adjust the top support 102 in the corresponding splicing frame 1 according to the extension and retraction of the top support 102; after all the splicing frames 1 are installed, use a laser rangefinder to verify and measure the elevation of the splicing frame 1 and the horizontal distance between two adjacent splicing frames 1.

[0031] For reference Figure 3 The diagram shows the pedestals spaced apart. The solid lines represent the distance measurements currently being performed, while the dashed lines represent distance measurements already completed. If the curvature meets the requirements, the laser point of the rangefinder will fall precisely at the fixed position of the opposite pedestal. For example, the pedestals for a 60m long-span steel beam are installed and adjusted by three groups of workers from the middle and both sides, or by two groups of workers from both sides towards the middle, to shorten the construction period. Verification measurements are taken by using a handheld laser rangefinder to measure the installation position and the extension / retraction position of the top support from one side of the pedestal to the other. The laser rangefinder is also used to illuminate the pedestal on the other side of the assembly platform, and the distance between the illuminated point and the pedestal is used to determine whether the installation curvature of the pedestal meets the requirements.

[0032] Step S051: Hoist the two steel beams of the first section onto the splicing jig 1, and after adjusting the two steel beams to be parallel to the positioning lines on the corresponding pedestals 100, temporarily fix them with guy ropes. Step S052: Install the inter-segment crossbeam between the two steel beams and remove the guy ropes; Step S053: Repeat the above steps to install the inter-segment crossbeams of the remaining steel beams. (Reference) Figure 5 and Figure 6 .

[0033] Furthermore, after all the splicing jigs 1 have been installed and secured, and before the two steel beams of the first segment are hoisted onto the splicing jigs 1, the following steps are included: The steel beams undergo a re-inspection, with the following steps: If burrs or welding spatter are found at the assembly points, they are removed; if the steel beams have experienced localized deformation during transportation that does not affect the quality of the members, they are adjusted by hammering, with shims placed during the hammering process. Specifically: Burrs and welding spatter on steel truss members at assembly points should be removed. If members experience localized deformation during transport that does not affect their quality, minor adjustments can be made using a hammer or jack. When hammering, a backing plate should be used; direct impact on the steel plate is prohibited. However, any straightening work must be approved by the supervisor and recorded. Heat straightening is recommended for integral node chords. Members with severe defects that cannot be straightened on-site should be returned to the factory for processing.

[0034] Furthermore, after the crossbeams between all steel beam segments are connected, the alignment of the entire steel beam is re-measured using a total station. If the alignment of the entire steel beam does not match the design curve, the platform 100 and the top support 102 are adjusted; otherwise, the entire steel beam is constructed with high-strength bolts.

[0035] Furthermore, the general steps during hoisting are as follows: After hoisting the two steel beams of the previous segment, when hoisting the two steel beams of the next segment, first insert one end of the two steel beams of the next segment into the splicing plate joint of the two steel beams of the previous segment, and then adjust according to the installation parameters of the splicing jig 1 corresponding to the other end of the two steel beams of the next segment; use a total station to verify the position and elevation of the two steel beams of the next segment.

[0036] The specific steps are as follows: (Refer to...) Figure 5 and Figure 6 Using a 10t gantry crane, the two I-beam longitudinal beam segments Z1 and Z1' from the previous section were hoisted to their marked positions on the platform. Their position and elevation were precisely adjusted using a total station to ensure the steel beams' position and alignment met the simulation requirements. Guy ropes were used to temporarily secure the positioned Z1 and Z1' longitudinal beam segments. The crossbeams H1 and H2 between the two segments were then installed, along with temporary bolts and pins as required. After the crossbeams and longitudinal beams were connected, the installed segments formed a relatively stable system, and the temporary guy ropes were removed.

[0037] Using a crane gantry, the Z2 and Z2' longitudinal beam segments are connected and installed. During hoisting and alignment, the ends adjacent to the Z1 and Z1' longitudinal beams must first be slowly and steadily inserted into the splice joints of the Z1 and Z1' longitudinal beam ends. Then, the positions of the other ends of the Z1 and Z1' longitudinal beams are adjusted according to the layout points and marking lines. Finally, the positions and elevations of the Z1 and Z1' longitudinal beams are precisely adjusted using a total station scan. After meeting the requirements, temporary bolts and drift pins are installed at the splice points as required, forming a relatively stable system for the connected steel beams. The inter-segment crossbeams are then installed, and temporary bolts and drift pins are installed as required.

[0038] In some preferred embodiments, reference Figure 4 The positioning lines on the pedestal 100 include a center line a, with second marking lines b parallel to both sides of the center line a; the distance between the second marking lines b is equal to the width of the steel beam, and the center line a coincides with the central axis of the steel beam. The positioning lines facilitate intuitive and accurate adjustments.

[0039] The pedestal 100 includes a concrete base and connecting stirrups, which are connected to the jig 101. After all the splicing jigs 1 are fixed, the following steps are also included: connecting all the pedestals 100 and casting them into an integral structure.

[0040] The structure of the pedestal 100 facilitates manufacturing and preparation, thus simplifying the manufacturing process. The top support is adjustable, and adjustable top support structures in this field can be referenced.

[0041] Following the steps outlined above, the steel beam assembly data was optimized based on the site conditions. This ensured that the curvature and pre-camber of the steel beams met design requirements. Furthermore, by incorporating local climate data into the algorithm, the construction period could be designed to adapt to environmental changes, avoiding periods of high humidity, heavy rainfall, and high wind speeds. This ensured construction safety while allowing for more accurate project timeline predictions and improved efficiency. The original construction plan, from December 20, 2020 to August 20, 2022, was now optimized to completion around May 11, 2022. This not only shortened the construction period but also mitigated the impact of adverse local conditions, preventing any safety incidents.

[0042] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A construction method for a long-span curved bridge deck, characterized in that, It includes the following steps: Obtain on-site survey data and design drawings of multiple steel beams, and establish a physical installation model; In the physical installation model, a splicing frame (1) is established to be connected to the multiple steel beams. The splicing frame (1) includes a top support (102), a frame (101) and a base (100) from top to bottom. Adjust the installation parameters of multiple splicing jigs (1) so that the simulated curve formed by splicing steel beams on the splicing jigs (1) matches the design curve; the installation parameters include the extension and retraction of the top support (102), the setting coordinates of the platform (100) and the positioning lines on the platform (100); Record the installation parameters of multiple splicing jigs (1) corresponding to the simulated curve to form splicing data; Based on the splicing data, multiple steel beams are installed using the splicing frame (1). This step specifically includes: installing and fixing all the splicing frames (1) according to the setting coordinates of the pedestal (100) and the extension / retraction of the top support (102); hoisting the two steel beams of the first segment onto the splicing frame (1), and after adjusting the two steel beams to be parallel to the positioning lines on the corresponding pedestal (100), temporarily fixing them with guy ropes; installing inter-segment crossbeams between the two steel beams and removing the guy ropes; repeating the above steps to install the inter-segment crossbeams of the remaining steel beams.

2. The construction method for long-span curved bridge decks as described in claim 1, characterized in that, The steps for establishing the splicing jig (1) in the physical installation model that corresponds to the multiple steel beams are as follows: The solid installation model is divided into multiple segments based on the curve, pre-camber, and cross slope of the overall steel beam. In the physical installation model, a splicing frame (1) is established that corresponds one-to-one with the segmented sections.

3. The construction method for long-span curved bridge decks as described in claim 1, characterized in that, After installing multiple sections of the steel beam using the splicing jig (1) based on the splicing data, the following steps are also included: Obtain local weather data for the construction site, including information on temperature changes, humidity changes, and wind season changes; Based on the weather data, the appropriate construction time for assembly is determined.

4. The construction method for long-span curved bridge decks as described in claim 1, characterized in that: After the two steel beams of the previous section are hoisted, when hoisting the two steel beams of the next section, first insert one end of the two steel beams of the next section into the splicing plate joint of the two steel beams of the previous section, and then adjust according to the installation parameters of the splicing jig (1) corresponding to the other end of the two steel beams of the next section; Use a total station to verify the position and elevation of the two steel beams in the next segment.

5. The construction method for long-span curved bridge decks as described in claim 1, characterized in that: After the crossbeams between all the steel beam segments are connected, the entire steel beam alignment is re-measured using a total station. If the overall shape of the steel beam does not match the design curve, adjust the platform (100) and the top support (102); otherwise, install high-strength bolts on the entire steel beam.

6. The construction method for long-span curved bridge decks as described in claim 1, characterized in that, Based on the setting coordinates of the pedestal (100) and the extension / retraction of the top support (102), install and fix all the splicing frames (1), including the following steps: Install all the splicing frames (1) according to the setting coordinates of the pedestal (100), and after each splicing frame (1) is installed, adjust the top support (102) in the corresponding splicing frame (1) according to the extension and retraction of the top support (102). After all the splicing frames (1) are installed, the elevation of the splicing frames (1) and the horizontal distance between two adjacent splicing frames (1) are verified and measured using a laser rangefinder.

7. The construction method for long-span curved bridge decks as described in claim 1, characterized in that, After all the splicing jigs (1) are installed and secured; before the two steel beams of the first segment are hoisted onto the splicing jigs (1), the following steps are included: The specific steps for re-inspecting the steel beams are as follows: If there are burrs or welding spatter at the steel beam assembly points, they should be removed. If the steel beam is partially deformed during transportation but this does not affect the quality of the member, it should be adjusted by hammering, and a pad should be placed during the hammering.

8. The construction method for long-span curved bridge decks as described in claim 1, characterized in that: The positioning lines on the pedestal (100) include a center line, and second marking lines are provided on both sides of the center line in parallel; the distance between the second marking lines is equal to the width of the steel beam, and the center line coincides with the central axis of the steel beam.

9. The construction method for long-span curved bridge decks as described in claim 1, characterized in that: The platform (100) includes a concrete base and connecting stirrups, which are connected to the formwork (101); After all the spliced ​​jigs (1) are fixed, the following steps are also included: Connect all the pedestals (100) together and cast them into a whole structure.

Images