Construction method of long-line multi-connected steel truss girder bridge

Abstract

The application is a construction method of long-line multi-connected steel truss bridge, comprising the following steps: erecting steel truss assembling support on the first bridge pier side of the long-line steel truss bridge; using crawler crane to assemble the first group of steel truss segments above the steel truss assembling support of the first bridge pier side; immediately paving the lower railway bridge deck after assembling one steel truss segment; setting temporary supporting pads on the top of the second bridge pier on the left side and the third bridge pier on the right side, taking the first bridge pier as the starting point; respectively installing the second group of steel truss segments to the two sides with the first group of steel truss segments as the center; continuing to assemble the next group of steel truss segments to the two sides until the whole long-line steel truss bridge is erected. The application combines the paving sequence of the bridge deck in the longitudinal and transverse directions with the erection and falling sequence of the steel truss, effectively controlling the cracks of the concrete bridge deck.

Description

Technical Field

[0001] This invention relates to the field of steel truss bridge technology, and in particular to a construction method for a long-line multi-span steel truss bridge. Background Technology

[0002] Steel truss bridges are widely used in the construction of dual-purpose road and rail bridges due to their strong span capacity, good load-bearing performance, and short construction period, saving resources and space while meeting transportation needs. However, conventional construction methods for long-span, multi-span steel truss bridges have several shortcomings. For example, long-span steel truss bridges are often designed as multi-span, multi-connection structures, and the actual structural system conversion is mainly achieved through welding and disconnecting temporary connections at the pier tops, resulting in cumbersome construction steps. Furthermore, for long-span steel trusses, the presence of continuous beams makes it easy for cracks to appear during the paving of the bridge deck at the pier tops, making it difficult to guarantee construction quality. Summary of the Invention

[0003] The present invention aims to address the shortcomings of the prior art by providing a construction method for a long-line multi-span steel truss bridge.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a construction method for a long-line multi-span steel truss bridge, comprising the following steps:

[0005] S1. A steel truss assembly support is erected on the side of the first pier in the middle of the long steel truss bridge.

[0006] S2. Use the crawler crane on the steel trestle bridge next to the long steel truss girder to assemble the first set of steel truss girder segments above the steel truss girder assembly support on the side of the first pier.

[0007] S3. After each steel truss girder segment is assembled, the lower railway bridge deck should be laid immediately, but the upper highway bridge deck should not be laid. The next steel truss girder segment should be assembled only after the lower railway bridge deck of the first steel truss girder segment has been laid.

[0008] S4. Assemble the bridge deck crane on the first set of steel truss girder segments that have been erected. Starting from the first pier, set temporary supports on the top of the second pier immediately to the left and the third pier immediately to the right. Place vertical jacks at different positions in the same transverse direction on the temporary supports. Using the first set of steel truss girder segments as the center, use the bridge deck crane to cantilever install the second set of steel truss girder segments on both sides. Erect temporary supports at the mid-span of the first and second piers, and at the mid-span of the third and fourth piers. Place the second set of steel truss girder segments on the temporary supports and temporary supports. Vertical jacks are placed on the top of the temporary supports for adjusting the elevation of the second set of steel truss girder segments.

[0009] S5. Repeat S4. The next set of steel truss segments of the long steel truss bridge continues to be cantilevered and assembled on both sides until the entire long steel truss bridge is erected.

[0010] S6. After the long steel truss girder is erected, the upper and lower chords of the steel truss girder segments are cut along the cutting line. The upper chords are cut first, and then the lower chords are cut to complete the transformation of the steel truss girder from a continuous to a simply supported force system at the location of the bridge expansion joint.

[0011] S7. For the concrete bridge deck of the upper highway, pour wet joint concrete as follows:

[0012] S71. Lay the first set of concrete bridge panels next to the top of the fifth pier and the top of the second pier on the outermost side span of the first span. Do not lay the concrete bridge panels of the other mid-span beams for the time being. When laying the first set of concrete bridge panels, proceed from one side to the other in the transverse direction of the bridge. After the first set of concrete bridge panels is laid, pour the wet joint between the first set of concrete bridge panels.

[0013] S72. Lay the second set of concrete bridge decks in the middle section of the first span. When laying the second set of concrete bridge decks, the laying should be carried out from one side to the other in the transverse direction of the bridge. After the second set of concrete bridge decks is laid, pour the wet joint between the second set of concrete bridge decks.

[0014] S73. Lift the steel truss beam on the top of the sixth pier, which is adjacent to the fifth pier on the outermost side span of the first span, and lay the third set of concrete bridge deck on the top of the sixth pier. When laying the third set of concrete bridge deck, it should be done from one side to the other in the transverse direction of the bridge. Pour the wet joint between the third set of concrete bridge deck. After the newly poured wet joint concrete meets the strength requirements, lower the steel truss beam.

[0015] S74. Repeat S73, and lift and lower the steel truss beams on the top of the remaining piers of the first span in sequence until the concrete bridge deck on the second to last pier of the first span is laid.

[0016] S75. At the same time, repeat steps S71-S74 until the concrete bridge deck of the second long steel truss bridge is paved.

[0017] S8. After all the concrete bridge decks are laid, use the vertical jacks on the top of each pier to lift the main beam, remove the temporary supports, and install the permanent supports.

[0018] Specifically, in S1, the steel truss assembly support must meet the assembly requirements of at least three steel truss segments.

[0019] Specifically, in S2, the first group of steel truss segments contains at least three steel truss segments.

[0020] Specifically, in S4, the top elevation of the temporary support pier is not higher than the cantilever front end of the second group of steel truss girder segments.

[0021] In particular, in S5, during the cantilever assembly of the long steel truss bridge to both sides, the upper and lower chords of adjacent steel truss segments at the bridge expansion joints are ensured to be integral members, ensuring that the entire long steel truss bridge is a continuous structure during the cantilever assembly process.

[0022] The beneficial effects of this invention are as follows: In the construction method of the long steel truss bridge of this invention, the steel truss segment erection sequence starts from the middle position of the entire long steel truss bridge and proceeds to both sides in a cantilever assembly, without the need for separate erection of each section; no temporary connection is set between the upper and lower chords of the steel truss bridge between adjacent sections; during the erection process, all the upper and lower chords of the entire long steel truss bridge are connected into a whole; after the erection is completed, the upper and lower chords at the expansion joints are cut, realizing the transformation of the steel truss bridge from continuous to simply supported.

[0023] During the construction of the long steel truss bridge of the present invention, the paving of the concrete bridge deck fully considers the stress characteristics of the continuous beam, and combines the longitudinal and transverse paving sequence of the bridge deck with the lifting and lowering sequence of the steel truss, which effectively controls the cracks in the concrete bridge deck. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the steel truss assembly support in S1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the steel truss girder erection construction in S2 of the present invention;

[0026] Figure 3 This is a schematic diagram of the steel truss erection construction in S4 of the present invention;

[0027] Figure 4 This is a schematic diagram showing the completion of the steel truss beam erection in S5 of the present invention;

[0028] Figure 5 This is a schematic diagram of the cutting position of the steel truss beam at the bridge expansion joint in S6 of the present invention;

[0029] Figure 6 This is a schematic diagram of the installation of the first set of concrete bridge deck panels in S71 of the present invention;

[0030] Figure 7 This is a schematic diagram of the installation of the second set of concrete bridge decks in S72 of the present invention;

[0031] Figure 8 This is a schematic diagram of the installation of the third group of concrete bridge decks in S73 of the present invention;

[0032] Figure 9 This is a schematic diagram of the installation of the full-bridge concrete bridge deck in S75 of the present invention;

[0033] In the diagram: 1-First pier; 2-Steel truss assembly support; 3-Bridge deck crane; 4-First group of steel truss segments; 5-Second pier; 6-Third pier; 7-Temporary support; 8-Second group of steel truss segments; 9-Fourth pier; 10-Temporary support; 11-Bridge expansion joint; 12-Cutting line; 13-Upper chord; 14-Lower chord; 15-Concrete bridge deck; 1501-First group of concrete bridge deck; 1502-Second group of concrete bridge deck; 1503-Third group of concrete bridge deck; 16-Fifth pier; 17-Sixth pier;

[0034] The following will describe in detail, with reference to the accompanying drawings, embodiments of the present invention. Detailed Implementation

[0035] The present invention will be further described below with reference to embodiments:

[0036] like Figures 1-9 As shown, a construction method for a long-line multi-span steel truss bridge includes the following steps:

[0037] S1. A steel truss assembly support 2 is erected on the side of the first pier 1 in the middle of the long steel truss bridge; the steel truss assembly support 2 shall meet the assembly requirements of at least three steel truss segments.

[0038] S2. Use the crawler crane on the steel trestle bridge next to the long steel truss to assemble the first group of steel truss segments 4 above the steel truss assembly support 2 on the side of the first pier 1; the first group of steel truss segments 4 shall contain at least three steel truss segments.

[0039] S3. After each steel truss girder segment is assembled, the lower railway bridge deck should be laid immediately, but the upper highway bridge deck should not be laid. The next steel truss girder segment should be assembled only after the lower railway bridge deck of the first steel truss girder segment has been laid.

[0040] S4. Assemble the bridge deck crane 3 on the first set of steel truss girder segments 4 that have been erected. Starting from the first pier 1, set temporary supports 7 on the top of the second pier 5 on the left and the third pier 6 on the right. Place vertical jacks at different positions in the same transverse direction on the temporary supports 7. Using the first set of steel truss girder segments 4 as the center, use the bridge deck crane 3 to cantilever install the second set of steel truss girder segments 8 on both sides. Erect temporary supports 10 at the mid-span of the first pier 1 and the second pier 5, and at the mid-span of the third pier 6 and the fourth pier 9. Place the second set of steel truss girder segments 8 on the temporary supports 7 and the temporary supports 10. The top of the temporary supports 10 is equipped with vertical jacks for adjusting the elevation of the second set of steel truss girder segments 8. The top elevation of the temporary supports 10 is not higher than the cantilever front end of the second set of steel truss girder segments 8.

[0041] S5. Repeat S4. The next set of steel truss segments of the long steel truss bridge continues to be cantilevered and assembled on both sides until the entire long steel truss bridge is erected. During the process of cantilevering the long steel truss bridge to both sides, ensure that the upper and lower chords of the adjacent steel truss segments at the bridge expansion joint 11 are integral members, so that the entire long steel truss bridge is a continuous structure during the cantilever assembly process.

[0042] S6. After the long steel truss girder is erected, the upper chord 13 and lower chord 14 of the steel truss girder segment are cut along the cutting line 12. The upper chord 13 is cut first, and then the lower chord 14 is cut to complete the transformation of the steel truss girder from a continuous to a simply supported force system at the bridge expansion joint 11.

[0043] S7. For the concrete bridge deck 15 of the upper highway, pour wet joint concrete as follows:

[0044] S71. The first set of concrete bridge deck 1501 is laid next to the top of the fifth pier 16 and the top of the second pier 5 on the outermost side span of the first span. The concrete bridge deck 15 of the other mid-span beams is not laid for the time being. When laying the first set of concrete bridge deck 1501, it should be done from one side to the other in the transverse direction of the bridge. After the first set of concrete bridge deck 1501 is laid, the wet joint between the first set of concrete bridge deck 1501 is poured.

[0045] S72. Lay the second set of concrete bridge deck 1502 in the middle section of the first span. When laying the second set of concrete bridge deck 1502, it should be done from one side to the other in the transverse direction of the bridge. After the second set of concrete bridge deck 1502 is laid, pour the wet joint between the second set of concrete bridge deck 1502.

[0046] S73. Lift the steel truss beam on the top of the fifth pier 16 next to the outermost side span of the first span, and lay the third set of concrete bridge deck 1503 on the top of the sixth pier 17. When laying the third set of concrete bridge deck 1503, it should be done from one side to the other in the transverse direction of the bridge. Pour the wet joint between the third set of concrete bridge deck 1503. After the newly poured wet joint concrete meets the strength requirements, lower the steel truss beam.

[0047] S74. Repeat S73, and lift and lower the steel truss beams on the top of the remaining piers of the first span in sequence until the third set of concrete bridge deck 15 on the second to last pier of the first span is laid.

[0048] S75. At the same time, repeat steps S71-S74 until the concrete bridge deck 15 on the second long steel truss bridge is paved.

[0049] S8. After all the concrete bridge deck 15 is laid, use the vertical jacks on the top of each pier to lift the main beam, remove the temporary support 7, and install the permanent support.

[0050] The construction method for long-line steel truss bridges of the present invention mainly includes the following steps: erection of steel trusses, paving of the lower railway bridge deck, conversion of the steel truss system, and paving of the upper concrete bridge deck. The steel truss segment erection sequence starts from the middle position of the entire long-line steel truss bridge and proceeds to both sides in a cantilevered assembly, without the need for separate erection of each segment. No temporary connections are set between the upper and lower chords of the steel truss bridge between adjacent segments. During the erection process, all the upper and lower chords of the entire long-line steel truss bridge are connected into a whole. After the erection is completed, the upper and lower chords at the bridge expansion joint 11 are cut to realize the conversion of the steel truss from continuous to simply supported.

[0051] During the construction of the long steel truss bridge of the present invention, the paving of the concrete bridge deck 15 fully considers the stress characteristics of the continuous beam, and combines the longitudinal and transverse paving sequence of the concrete bridge deck 15 with the lifting and lowering sequence of the steel truss, which effectively controls the cracks in the concrete bridge deck 15.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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 this invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The present invention has been described above by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A construction method for a long-line multi-span steel truss bridge, characterized in that, Includes the following steps: S1. A steel truss assembly support (2) is erected on the side of the first pier (1) in the middle of the long steel truss bridge. S2. Use the crawler crane on the steel trestle bridge next to the long steel truss to assemble the first group of steel truss segments (4) above the steel truss assembly support (2) on the side of the first pier (1). S3. After each steel truss girder segment is assembled, the lower railway bridge deck should be laid immediately, but the upper highway bridge deck should not be laid. The next steel truss girder segment should be assembled only after the lower railway bridge deck of the first steel truss girder segment has been laid. S4. Assemble the bridge deck crane (3) on the first set of steel truss girder segments (4) that have been erected. Starting from the first pier (1), set temporary supports (7) on the top of the second pier (5) on the left and the third pier (6) on the right. Place vertical jacks at different positions in the same transverse direction on the temporary supports (7). Using the first set of steel truss girder segments (4) that have been erected as the center, use the bridge deck crane (3) to cantilever install the second set of steel truss girder segments (8) on both sides. Erect temporary supports (10) at the mid-span of the first pier (1) and the second pier (5), and at the mid-span of the third pier (6) and the fourth pier (9). Place the second set of steel truss girder segments (8) on the temporary supports (7) and the temporary supports (10). The top of the temporary supports (10) is equipped with vertical jacks for adjusting the elevation of the second set of steel truss girder segments (8). S5. Repeat S4. The next set of steel truss segments of the long steel truss bridge continues to be cantilevered and assembled on both sides until the entire long steel truss bridge is erected. S6. After the long steel truss girder is erected, the upper chord (13) and lower chord (14) of the steel truss girder segment are cut along the cutting line (12). The upper chord (13) is cut first, and then the lower chord (14) is cut to complete the transformation of the steel truss girder from a continuous to a simply supported force system at the location of the bridge expansion joint (11). S7. For the concrete bridge deck (15) of the upper highway, pour wet joint concrete as follows: S71. The first set of concrete bridge deck (1501) is laid next to the top of the fifth pier (16) and the second pier (5) on the outermost side span of the first span. The concrete bridge deck (15) of the other mid-span beams is not laid for the time being. When laying the first set of concrete bridge deck (1501), it should be carried out from one side to the other in the transverse direction of the bridge. After the first set of concrete bridge deck (1501) is laid, the wet joint between the first set of concrete bridge deck (1501) is poured. S72. Lay the second set of concrete bridge deck (1502) in the middle section of the first span. When laying the second set of concrete bridge deck (1502), it should be done from one side to the other in the transverse direction of the bridge. After the second set of concrete bridge deck (1502) is laid, pour the wet joint between the second set of concrete bridge deck (1502). S73. Lift the steel truss beam on the top of the sixth pier (17) next to the fifth pier (16) on the outermost side span of the first span, and lay the third set of concrete bridge deck (1503) on the top of the sixth pier (17). When laying the third set of concrete bridge deck (1503), it should be done from one side to the other in the transverse direction of the bridge. Pour the wet joint between the third set of concrete bridge deck (1503). After the strength of the newly poured wet joint concrete meets the requirements, lower the steel truss beam. S74. Repeat S73, and lift and lower the steel truss beams on the top of the remaining piers of the first span in sequence until the concrete bridge deck (15) on the second to last pier of the first span is laid. S75. At the same time, repeat steps S71-S74 until the concrete bridge deck (15) on the second long steel truss bridge is paved. S8. After all the concrete bridge deck (15) is laid, the main beam is lifted by the vertical jacks on the top of each pier, the temporary support (7) is removed, and the permanent support is installed.

2. The construction method for a long-line multi-span steel truss bridge according to claim 1, characterized in that, In S1, the steel truss assembly support (2) must meet the assembly requirements of at least three steel truss segments.

3. The construction method for a long-line multi-span steel truss bridge according to claim 2, characterized in that, In S2, the first group of steel truss segments (4) contains at least three steel truss segments.

4. The construction method for a long-line multi-span steel truss bridge according to claim 3, characterized in that, In S4, the top elevation of the temporary support pier (10) is not higher than the cantilever front end of the second group of steel truss girder segments (8).

5. The construction method for a long-line multi-span steel truss bridge according to claim 4, characterized in that, In S5, during the process of the long steel truss bridge continuing to be assembled on both sides, it is ensured that the upper and lower chords of the adjacent steel truss segments at the bridge expansion joint (11) are integral members, and the entire long steel truss bridge is a continuous structure during the cantilever assembly process.

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