Steel-concrete composite beam support and its prestressing construction method

Abstract

This invention relates to the field of bridge construction technology, and particularly to a steel-concrete composite beam support and its preloading construction method. The steel-concrete composite beam support includes two rows of separate side supports, which are used to symmetrically support the bottom of the side boxes on both sides of the main steel beam. Multiple rows of steel pipe columns are arranged at intervals, and each row of steel pipe columns includes multiple steel pipe columns. Adjacent steel pipe columns are connected by diagonal bracing groove steel frames. A transverse distribution beam is fixed at the top of the multiple rows of steel pipe columns, and a Bailey beam is fixed on the transverse distribution beam. A track distribution beam is set on the top of the Bailey beam, and a sliding track is set on the track distribution beam. A transport trolley slides on the sliding track. The sliding track and transport trolley realize dynamic segmented preloading, ensuring that the settlement data accurately reflects the performance of the support. The modular structure facilitates rapid assembly and shortens the construction period. The symmetrical arrangement of the separate side supports avoids load concentration in the middle, reduces local stress concentration, and results in a more uniform load distribution, making it suitable for the construction of long-span bridges.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a steel-concrete composite beam support and its prestressing construction method. Background Technology

[0002] In bridge engineering, the construction of steel-concrete composite beams typically requires the use of temporary scaffolding as a support system to ensure the stability of the beam during installation and concrete pouring. The load-bearing capacity and deformation control of the scaffolding are directly related to construction safety and the final bridge alignment; therefore, their reliability must be verified through pre-stressing tests.

[0003] Traditional support systems and prestressing methods have the following problems: Traditional support systems mostly use full-span scaffolding or simple support structures, which are difficult to adapt to the construction requirements of large-span, high-tonnage steel-concrete composite beams. Especially for separated side box girder structures, uneven load distribution can easily lead to scaffold instability. Insufficient column spacing and beam stiffness can easily cause local deformation exceeding limits. When performing prestressed prestressing construction, the contact area of ​​the base plate-supported scaffolding is small, which easily leads to stress concentration and low data accuracy. Summary of the Invention

[0004] This invention provides a steel-concrete composite beam support and its pre-stressing construction method to solve the defects of the traditional base plate support structure in the prior art, which is difficult to adapt to the construction requirements of large-span, large-tonnage steel-concrete composite beams and has low accuracy during pre-stressing construction.

[0005] This invention provides a steel-concrete composite beam support system, comprising two rows of separate side supports. These two rows of separate side supports symmetrically support the bottom of the side boxes on both sides of the main steel beam. Each separate side support includes multiple rows of steel pipe columns, a transverse distribution beam, a Bailey bridge beam, a track distribution beam, and a transport trolley. The multiple rows of steel pipe columns are arranged at intervals along the length of the bridge. Each row of steel pipe columns includes multiple spaced steel pipe columns, and adjacent steel pipe columns are connected by diagonal bracing. The transverse distribution beam is fixed to the top of the multiple rows of steel pipe columns. The Bailey bridge beam is fixed to the transverse distribution beam. The track distribution beam is located on top of the Bailey bridge beam and has a sliding track along the length of the bridge. The transport trolley is slidably mounted on the sliding track.

[0006] According to a steel-concrete composite beam support provided by the present invention, a U-shaped clamp is provided at the connection between the track distribution beam and the Bailey beam, which is suitable for restricting the displacement of the track distribution beam on the Bailey beam by means of multiple U-shaped clamps.

[0007] According to a steel-concrete composite beam support provided by the present invention, the sliding track is fixed to the track distribution beam by a plurality of fasteners. Each fastener includes three track clamps, which are arranged in a triangular pattern on both sides of the sliding track. One end of each track clamp is fixed to the track distribution beam, and the other end is fastened to the sliding track.

[0008] According to the present invention, a steel-concrete composite beam support is provided, wherein multiple longitudinal support steel pipes are arranged at intervals on both sides of the track distribution beam, and channel steel diagonal braces are connected to the side walls of the longitudinal support steel pipes, and the other end of the channel steel diagonal braces is fixed to the track distribution beam.

[0009] According to the present invention, a steel-concrete composite beam support is provided, wherein the transverse distribution beam and the track distribution beam each include a plurality of three-section I-beams arranged in parallel along the length of the bridge, the Bailey beam includes a plurality of Bailey panels and reinforcing chords located at the upper and lower ends of the Bailey panels respectively, the top of the transverse distribution beam is connected to the reinforcing chord at the lower end of the Bailey beam by bolt fasteners, and the bottom of the track distribution beam is connected to the reinforcing chord at the upper end of the Bailey beam by bolt fasteners.

[0010] This invention also provides a method for pre-stressing a steel-concrete composite beam support, applicable to pre-stressing the steel-concrete composite beam support described in any of the above-mentioned embodiments, the method comprising: Assemble and install the steel-concrete composite beam support, divide the steel-concrete composite beam support into multiple segments in sequence, and set monitoring points on each segment of the steel-concrete composite beam support.

[0011] Compare the total weight of all steel beam segments to be installed and bridge deck segments, and take the steel beam segment with the largest total weight as the preloaded segment.

[0012] The selected preloaded segment is applied to the first segment of the steel-concrete composite beam support. The preloaded settlement displacement of the monitoring point is monitored every six hours. When the difference between the preloaded settlement displacement values ​​of two adjacent monitoring points is not greater than 2mm, the preloaded segment is slid to the next segment of the steel-concrete composite beam support.

[0013] Pre-compression settlement displacement monitoring was carried out on all segments of the steel-concrete composite beam support in sequence.

[0014] According to the present invention, a pre-stressing construction method for a steel-concrete composite beam support includes setting monitoring points on each segment of the steel-concrete composite beam support. Monitoring points are set on the steel pipe columns, transverse distribution beams, Bailey beams, and track distribution beams of the steel-concrete composite beam support. The monitoring points on the steel pipe columns are used to monitor the foundation settlement value, and the monitoring points on the transverse distribution beams, Bailey beams, and track distribution beams are used to monitor and calculate the elastic deformation value of the steel-concrete composite beam support.

[0015] The preloading construction method for a steel-concrete composite beam support provided by the present invention further includes: when the difference between the preloading settlement displacement values ​​of two adjacent monitoring points is greater than 2 mm and less than the warning value, the preloading settlement displacement of the monitoring point is monitored once every six hours until the difference between the preloading settlement displacement values ​​of two adjacent monitoring points is not greater than 2 mm.

[0016] The preloading construction method for a steel-concrete composite beam support provided by the present invention further includes: when the difference between the preloading settlement displacement values ​​of two adjacent monitoring points is greater than the warning value, stopping the preloading construction and strengthening the steel-concrete composite beam support.

[0017] According to the preloading construction method of the steel-concrete composite beam support provided by the present invention, the method further includes: adjusting the precamber of the support according to the preloading construction monitoring data, wherein the precamber of the support = elastic deformation value + foundation settlement value - tension camber amount, and the tension camber amount is the recovery amount of the transverse distribution beam, the Bailey beam and the track distribution beam after the preloading load segment leaves.

[0018] The steel-concrete composite beam support provided by this invention uses two rows of separate side supports symmetrically arranged at the bottom of the side boxes on both sides of the main steel beam to directly support the stress area of ​​the side boxes, avoiding load concentration in the middle, resulting in a more uniform load distribution, reducing local stress concentration, and meeting the construction requirements of large-span steel-concrete composite beams. Multiple rows of steel pipe columns of the separate side supports are arranged at intervals along the length of the bridge, with each row containing multiple independent steel pipe columns. Adjacent steel pipe columns are connected by diagonal bracing steel frames, enhancing the lateral stability of the steel pipe columns and preventing lateral overturning during construction. A transverse distribution beam is fixed to the top of the steel pipe columns, evenly transferring the concentrated load of the steel pipe columns to the lower structure, improving overall rigidity and reducing elastic deformation of the support. Bailey beams are fixed to the transverse distribution beams, serving as the main load-bearing trusses. The high strength and lightweight characteristics of Bailey beams are suitable for large tonnage loads, and the standardized components facilitate rapid assembly and disassembly. The track distribution beam is located on top of the Bailey beam, and the sliding track is arranged longitudinally along the bridge. The transport trolley can slide to bear the preload, realizing the segmented sliding loading of the preload, simulating the actual construction conditions, and avoiding the problem of uneven settlement of the support caused by traditional overall preloading. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a side view structural diagram of the steel-concrete composite beam support provided by the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of AA section.

[0022] Figure 3 This is a schematic diagram of the working structure of the track clamp provided by the present invention.

[0023] Figure 4 This is a schematic diagram of the pre-stressing construction method for steel-concrete composite beam supports provided by the present invention.

[0024] Reference numerals: 1. Steel pipe column; 2. Diagonal bracing channel steel frame; 3. Transverse distribution beam; 4. Bailey beam; 5. Track distribution beam; 6. Sliding track; 7. Transport trolley; 8. Longitudinal support steel pipe; 9. Channel steel diagonal bracing. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention 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. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0028] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] The following is combined with Figures 1 to 4 The present invention describes the steel-concrete composite beam support and its prestressing construction method.

[0031] One embodiment of the present invention provides a steel-concrete composite beam support, combined with Figure 1 and Figure 2 As shown, the steel-concrete composite beam support includes two rows of separate side supports, which are used to symmetrically support the bottom of the side boxes on both sides of the main body of the steel beam. The separate side supports include multiple rows of steel pipe columns 1, transverse distribution beams 3, Bailey beams 4, track distribution beams 5, and transport trolleys 7. The multiple rows of steel pipe columns 1 are arranged at intervals along the length of the bridge. Each row of steel pipe columns 1 includes multiple steel pipe columns 1 distributed at intervals. Adjacent steel pipe columns 1 are connected by diagonal bracing steel frames 2. The transverse distribution beams 3 are fixed to the top of the multiple rows of steel pipe columns 1. The Bailey beams 4 are fixed on the transverse distribution beams 3. The track distribution beams 5 are set on the top of the Bailey beams 4. The track distribution beams 5 are equipped with sliding tracks 6 along the length of the bridge. The transport trolleys 7 are slidably set on the sliding tracks 6.

[0032] It is understandable that the steel-concrete composite beam support in this embodiment, through two rows of separate side supports symmetrically arranged at the bottom of the side boxes on both sides of the main steel beam, directly supports the stress area of ​​the side boxes, avoiding load concentration in the middle, resulting in a more uniform load distribution, reducing local stress concentration, and adapting to the construction requirements of large-span steel-concrete composite beams. Multiple rows of steel pipe columns 1 of the separate side supports are arranged at intervals along the length of the bridge, with each row containing multiple independent steel pipe columns 1. Adjacent steel pipe columns 1 are connected by diagonal bracing steel frames 2, enhancing the lateral stability of the steel pipe columns 1 and preventing lateral overturning during construction. A transverse distribution beam 3 is fixed to the top of the steel pipe columns, evenly transferring the concentrated load of the steel pipe columns 1 to the lower structure, improving overall rigidity and reducing elastic deformation of the support. A Bailey beam 4 is fixed to the transverse distribution beam 3, serving as the main load-bearing truss. The high strength and lightweight characteristics of the Bailey beam 4 are suitable for large tonnage loads, and the standardized components facilitate rapid assembly and disassembly. The track distribution beam 5 is located on top of the Bailey beam 4, the sliding track 6 is arranged along the longitudinal direction of the bridge, and the transport trolley 7 can slide to bear the preload, realizing the segmented sliding loading of the preload, simulating the actual construction conditions, and avoiding the problem of uneven settlement of the support caused by traditional overall preloading.

[0033] It should be understood that the steel-concrete composite beam support in this embodiment, through the design of separate side supports + inclined bracing steel frame, significantly enhances the resistance to lateral displacement and deformation; the sliding track 6 + transport trolley 7 realizes dynamic segmented preloading, ensuring that the settlement data truly reflects the performance of the support; the modular structure (steel pipe column 1, Bailey beam 4, etc.) facilitates rapid assembly and shortens the construction period; compared with the traditional full-span support or simple support structure, the steel-concrete composite beam support in this embodiment uses less material and is suitable for the construction of long-span bridges.

[0034] In traditional steel-concrete composite beam support construction, the connection between the track distribution beam and the Bailey beam is usually achieved through simple welding or bolt fixing. Under dynamic loads (such as concrete pouring or preload slippage), the track distribution beam is prone to lateral or longitudinal displacement, affecting the overall stability of the support. Furthermore, it is difficult to ensure precise alignment between the track distribution beam and the Bailey beam, potentially leading to uneven sliding tracks and increased running resistance of the transport trolley. In some embodiments of the steel-concrete composite beam support of this invention, U-shaped clips are provided at the connection between the track distribution beam 5 and the Bailey beam 4, suitable for restricting displacement of the track distribution beam 5 on the Bailey beam 4 using multiple U-shaped clips.

[0035] Multiple U-shaped clips are installed at the connection between the track distribution beam 5 and the Bailey beam 4, spaced apart along the longitudinal direction of the bridge (usually 1-2m apart). The U-shaped clips face downwards and are fastened to the reinforcing chord at the upper end of the Bailey beam 4 with bolts. The U-shaped clips effectively prevent displacement of the track distribution beam 5 under load through three-dimensional constraints (vertical support + lateral restraint + longitudinal anti-slip). Moreover, the U-shaped clips allow for fine-tuning of the track distribution beam 5 before final bolt tightening, ensuring high-precision alignment of the sliding track. This design is applicable to different types of Bailey beams (such as standard and reinforced types), demonstrating good versatility.

[0036] The U-shaped clamp in this embodiment is made of high-strength steel with a U-shaped cross-section and anti-slip texture on the inner side to increase frictional resistance. Bolt holes are pre-drilled on both sides of the U-shaped clamp, aligning with pre-drilled holes at the bottom of the track distribution beam 5, and connected by high-strength bolts. The U-shaped clamp avoids the risk of localized cracking caused by stress concentration in traditional rigid connections, and its anti-slip texture design further increases anti-slip capability, making it particularly suitable for bridge construction with steep gradients. Specifically, during installation, the track distribution beam 5 is initially placed on top of the Bailey bridge 4 and adjusted to the designed position. The U-shaped clamp is then inserted into the reinforcing chord of the Bailey bridge 4 from below. The bolts are initially tightened but not locked. A total station is used to calibrate the alignment of the track distribution beam 5. After confirming that everything is correct, the bolts are finally tightened to complete the positioning and fixing.

[0037] In traditional steel-concrete composite beam support construction, sliding tracks are often fixed using single-point fixing or simple clamping methods. These methods are prone to loosening under dynamic loads, leading to track displacement. Furthermore, the connection stiffness between the track and the distribution beam is insufficient, affecting load transfer efficiency. Moreover, the lack of multi-directional constraint capabilities makes it difficult to adapt to complex stress conditions. In some embodiments of the steel-concrete composite beam support of this invention, the innovative "three-pronged track clamp fastener system" effectively solves the above-mentioned technical problems.

[0038] Specifically, the sliding track 6 is fixed to the track distribution beam 5 by multiple fasteners. Each fastener includes three track clamps, which are arranged in a triangular pattern on both sides of the sliding track 6. One end of each track clamp is fixed to the track distribution beam 5, and the other end is fastened to the sliding track 6. Each set of fasteners contains three independent track clamps. Two track clamps are provided on one side of the sliding track 6, and one track clamp is provided on the other side, with the positions corresponding to the two track clamps on the other side, so that the three track clamps are arranged in a triangular pattern on both sides of the sliding track 6. The track clamps are made of Q345B steel with a thickness of 12mm. See [link / reference]. Figure 3 As shown, for each track clamp, one end is welded and fixed to the track distribution beam 5, and the other end is fastened and pressed against the protruding part at the lower end of the sliding track 6, so that the end abuts against the sliding track 6. This can limit the sliding track 6 in both the horizontal and vertical directions. Through the three track clamps arranged in a triangular pattern on both sides of the sliding track 6, the sliding track 6 is firmly fixed to the track distribution beam 5.

[0039] In some embodiments of the steel-concrete composite beam support of the present invention, multiple longitudinal support steel pipes 8 are arranged at intervals on both sides of the track distribution beam 5, and channel steel diagonal braces 9 are connected to the side walls of the longitudinal support steel pipes 8, with the other end of the channel steel diagonal braces 9 fixed to the track distribution beam 5.

[0040] Understandably, the longitudinal support steel pipes 8 on both sides of the track distribution beam 5 are used to level the main body of the steel beam. The sliding track 6 and the transport trolley 7 are located between the two longitudinal support steel pipes 8. Before the transport trolley 7 slides, the main body of the steel beam is placed on the longitudinal support steel pipes 8 to ensure that the main body of the steel beam is horizontal. Then the transport trolley 7 is started to raise and support the main body of the steel beam to ensure that the main body of the steel beam is horizontally supported and that the support will not be unevenly stressed or excessively deformed due to eccentric loading.

[0041] In some embodiments of the steel-concrete composite beam support of the present invention, the transverse distribution beam 3 and the track distribution beam 5 both include multiple three-section I-beams arranged in parallel along the length of the bridge, and the Bailey beam 4 includes multiple Bailey panels and reinforcing chords located at the upper and lower ends of the Bailey panels respectively. The top of the transverse distribution beam 3 is connected to the reinforcing chord at the lower end of the Bailey beam 4 by bolt fasteners, and the bottom of the track distribution beam 5 is connected to the reinforcing chord at the upper end of the Bailey beam 4 by bolt fasteners. In some specific examples, the transverse distribution beam 3 is made of 3×I45a I-beams, the track distribution beam 5 is made of 3×I20a I-beams, the Bailey beam 4 is a standard 321 Bailey beam, the reinforcing chord section height is 100mm and the wall thickness is 8mm, and the components are connected by 10.9 grade M24 high-strength bolts with a bolt spacing of 150mm and staggered arrangement. The contact surfaces are sandblasted (Sa2.5 grade) and 10mm thick node connection plates are set, which improves the structural performance of the steel-concrete composite beam support structure, the ultimate bearing capacity can reach 800kN / m, the stress concentration factor is reduced to 1.15, and the fatigue life is extended by 3 times.

[0042] In another aspect, the present invention provides a method for pre-stressing a steel-concrete composite beam support, applicable to pre-stressing the steel-concrete composite beam supports in any of the above embodiments or examples. For some specific embodiments, see [link to specific embodiments]. Figure 4 As shown, the prestressing construction method for steel-concrete composite beam supports includes the following steps S1 to S4.

[0043] S1. Assemble and install the steel-concrete composite beam support, divide the steel-concrete composite beam support into multiple segments in sequence, and set monitoring points on each segment of the steel-concrete composite beam support.

[0044] Monitoring points are set on the steel pipe column 1, transverse distribution beam 3, Bailey beam 4, and track distribution beam 5 of the steel-concrete composite beam support. The monitoring points on the steel pipe column 1 are used to monitor the foundation settlement value, and the monitoring points on the transverse distribution beam 3, Bailey beam 4, and track distribution beam 5 are used to monitor and calculate the elastic deformation value of the steel-concrete composite beam support. Each segment cross section is ensured to include at least 10 monitoring points.

[0045] S2. Compare the total weight of the steel beam body and bridge deck of all the segments to be installed, and take the steel beam body and bridge deck segment with the largest total weight as the preload segment.

[0046] S3. Apply the selected preloaded segment to the first segment of the steel-concrete composite beam support. Monitor the preloaded settlement displacement of the monitoring point every six hours. When the difference between the preloaded settlement displacement values ​​of two adjacent monitoring points is not greater than 2mm, slide the preloaded segment to the next segment of the steel-concrete composite beam support.

[0047] S4. Conduct pre-compression settlement displacement monitoring on all segments of the steel-concrete composite beam support in sequence.

[0048] Understandably, due to the base plate support of the support structure, the feasibility of using traditional counterweights and prestressing methods for preloading is poor, as the contact area is small. In this embodiment, the preloading construction method for the steel-concrete composite beam support uses the steel beam body + bridge deck as the preloading load. Preloading is implemented after the steel beam body + bridge deck are installed on the steel-concrete composite beam support, and the settlement of the steel pipe column 1, transverse distribution beam 3, Bailey beam 4, and track distribution beam 5 is observed. Before preloading, the original elevation of the monitoring points is measured and recorded in detail. Preloading monitoring of the monitoring points is conducted using a total station. The support is preloaded segment by segment. After the preloading requirements are met, the support is moved to the next segment using a transport trolley 7 for further preloading observation until the entire support is preloaded.

[0049] In some specific examples, the preloading process is as follows: After the steel-concrete composite beam support is assembled, the platform centerline is measured, monitoring points are set up and their elevations are determined. After the preloading load moves to this segment, the displacement of each monitoring point is monitored and recorded at 6-hour intervals. Sliding can only continue when the difference in preloading settlement displacement between two adjacent monitoring points is no greater than 2mm. After the first segment is preloaded, the preloading load segment is slid to the second segment using a transport trolley 7. Preloading and monitoring are then performed on the second segment until the last segment is completed. If the cumulative settlement over 6 hours exceeds 2mm but does not exceed the warning or limit values, settlement monitoring must continue for another 6 hours until the settlement stabilizes and the difference in preloading settlement displacement between two adjacent monitoring points is no greater than 2mm. If the settlement exceeds the warning or limit values, preloading construction must be stopped, a special support reinforcement plan must be developed, and the steel-concrete composite beam support must be reinforced.

[0050] Furthermore, the pre-stressing construction method for steel-concrete composite beam supports also includes: adjusting the pre-camber of the supports based on the pre-stressing construction monitoring data. The pre-camber of the supports = elastic deformation value + foundation settlement value - tensioning camber amount. The tensioning camber amount is the recovery amount of the transverse distribution beam 3, Bailey beam 4 and track distribution beam 5 after the pre-stressing load segment leaves.

[0051] Specifically, based on the measured elastic deformation value of the support under the load of the beam segment and the foundation settlement value, this elastic deformation value, foundation settlement value, and the camber after tensioning are superimposed with the pre-camber required by other factors in the construction control. This allows for the calculation of the pre-camber that the steel-concrete composite beam support should adopt during construction, and the steel beam elevation is readjusted according to the calculated pre-camber. This embodiment achieves closed-loop control of "monitoring-analysis-adjustment" by establishing a scientific pre-camber calculation system, developing precise adjustment technology, and constructing a dynamic control mechanism. During construction, the pre-camber of the steel beam is set based on the pre-stress observation results and simulation calculation results from a qualified construction monitoring unit to ensure that the beam alignment meets the design requirements after the bridge is completed, significantly reducing the workload of subsequent cable adjustment.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel-concrete composite beam support, characterized in that, It includes two rows of separate side supports, which are used to symmetrically support the bottom of the side boxes on both sides of the main steel beam. The separate side supports include: Multiple rows of steel pipe columns (1) are arranged at intervals along the length of the bridge. Each row of steel pipe columns (1) includes multiple steel pipe columns (1) distributed at intervals. Adjacent steel pipe columns (1) are connected by a diagonal bracing steel frame (2). A transverse distribution beam (3) is fixed to the top of the multiple rows of steel pipe columns (1); Bailey beam (4) is fixed on the transverse distribution beam (3); A track distribution beam (5) is set on the top of the Bailey beam (4), and a sliding track (6) is provided on the track distribution beam (5) along the length of the bridge. The transport trolley (7) is slidably mounted on the sliding track (6).

2. The steel-concrete composite beam support according to claim 1, characterized in that, The section where the track distribution beam (5) connects to the Bailey beam (4) is provided with a U-shaped clip, which is suitable for restricting the displacement of the track distribution beam (5) on the Bailey beam (4) by means of multiple U-shaped clips.

3. The steel-concrete composite beam support according to claim 1, characterized in that, The sliding track (6) is fixed to the track distribution beam (5) by multiple fasteners. Each fastener includes three track clamps. The three track clamps are arranged in a triangular pattern on both sides of the sliding track (6). One end of the track clamp is fixed to the track distribution beam (5), and the other end is fastened to the sliding track (6).

4. The steel-concrete composite beam support according to any one of claims 1 to 3, characterized in that, Multiple longitudinal support steel pipes (8) are arranged at intervals on both sides of the track distribution beam (5). The side walls of the longitudinal support steel pipes (8) are connected to channel steel diagonal braces (9), and the other end of the channel steel diagonal braces (9) is fixed to the track distribution beam (5).

5. The steel-concrete composite beam support according to any one of claims 1 to 3, characterized in that, Both the transverse distribution beam (3) and the track distribution beam (5) include multiple three-section I-beams arranged in parallel along the length of the bridge. The Bailey beam (4) includes multiple Bailey panels and reinforcing chords located at the upper and lower ends of the Bailey panels. The top of the transverse distribution beam (3) is connected to the reinforcing chord at the lower end of the Bailey beam (4) by bolt fasteners. The bottom of the track distribution beam (5) is connected to the reinforcing chord at the upper end of the Bailey beam (4) by bolt fasteners.

6. A method for pre-stressing a steel-concrete composite beam support, characterized in that, This method is applicable to the pre-stressing construction of the steel-concrete composite beam support according to any one of claims 1 to 5, wherein the pre-stressing construction method of the steel-concrete composite beam support includes: Assemble and install the steel-concrete composite beam support, divide the steel-concrete composite beam support into multiple segments in sequence, and set monitoring points on each segment of the steel-concrete composite beam support; Compare the total weight of all steel beam segments to be installed and bridge deck segments, and take the steel beam segment with the largest total weight as the preloaded segment. The selected preloaded segment is applied to the first segment of the steel-concrete composite beam support. The preloaded settlement displacement of the monitoring point is monitored every six hours. When the difference between the preloaded settlement displacement values ​​of two adjacent monitoring points is not greater than 2mm, the preloaded segment is slid to the next segment of the steel-concrete composite beam support. Pre-compression settlement displacement monitoring was carried out on all segments of the steel-concrete composite beam support in sequence.

7. The pre-stressing construction method for steel-concrete composite beam supports according to claim 6, characterized in that, Setting monitoring points on each segment of the steel-concrete composite beam support includes setting monitoring points on the steel pipe column (1), transverse distribution beam (3), Bailey beam (4), and track distribution beam (5) of the steel-concrete composite beam support. The monitoring points on the steel pipe column (1) are used to monitor the foundation settlement value, and the monitoring points on the transverse distribution beam (3), the Bailey beam (4), and the track distribution beam (5) are used to monitor and calculate the elastic deformation value of the steel-concrete composite beam support.

8. The pre-stressing construction method for steel-concrete composite beam supports according to claim 6, characterized in that, Also includes: When the difference between the preload settlement displacement values ​​of two adjacent monitoring points is greater than 2 mm but less than the warning value, continue to monitor the preload settlement displacement of the monitoring point every six hours until the difference between the preload settlement displacement values ​​of two adjacent monitoring points is no greater than 2 mm.

9. The pre-stressing construction method for steel-concrete composite beam supports according to claim 8, characterized in that, Also includes: When the difference between the preload settlement displacement values ​​of two adjacent monitoring points exceeds the warning value, the preload construction is stopped, and the steel-concrete composite beam support is reinforced.

10. The pre-stressing construction method for steel-concrete composite beam supports according to claim 7, characterized in that, Also includes: The pre-camber of the support is adjusted according to the pre-stressing construction monitoring data. The pre-camber of the support = elastic deformation value + foundation settlement value - tensioning camber amount. The tensioning camber amount is the recovery amount of the transverse distribution beam (3), the Bailey beam (4) and the track distribution beam (5) after the pre-stressing load segment leaves.

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