Method for installing and constructing oblique crossing canal-crossing steel arch bridge with few supports and large segments

Abstract

The invention relates to an oblique crossing canal steel arch bridge few-support large-segment installation construction method which comprises the following steps that S1, a left straining beam installation support and a right straining beam installation support of an arch bridge are arranged in the navigation direction of an under-bridge canal channel, and the connecting line of the left straining beam installation support and the right straining beam installation support forms an oblique angle with the axis of a bridge; s2, the left straining beam and the right straining beam are installed in an asymmetric subsection mode; s3, an end cross beam is installed between the left straining beam and the right straining beam, after an integral frame is formed, the left straining beam installation support and the right straining beam installation support are heightened, an arch rib installation support is formed, and then arch ribs are installed on the arch rib installation support; and S4, suspenders are installed between the arch rib and the left straining beam and between the arch rib and the right straining beam, and then standard cross beams and bridge deck slabs are installed. Compared with the prior art, the number of the supports is reduced, the span of the supports is reduced while oblique angle navigation is met, the bending moment in the straining beam construction process is reduced, the spanning capacity of the supports is improved, and the using amount of materials is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, and in particular to a method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal. Background Art

[0002] The construction of steel box tied arch bridges is mostly carried out by the bracket method. For the construction of tied arch bridges across canals, the top-pushing method can be used for construction. When the top-pushing method is used for construction, the temporary measures required are relatively expensive. The traditional bracket installation method generally completes the installation of the tie beam and the bridge deck first, and then completes the arch rib installation and hanger tensioning on the bridge deck, that is, the beam-first-arch-later construction method. When the traditional bracket method is used for construction, the spacing between the brackets is relatively small. Affected by the force of the tie beam and the bearing capacity of the bracket, it is impossible to increase the temporary span of the construction process, and it is difficult to meet the requirements of temporary navigation during the construction process across the waterway. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a method for installing and constructing a large section of an oblique steel arch bridge across a canal with fewer supports, thereby reducing the number of supports, reducing the span of the supports while meeting the requirements of oblique navigation, reducing the bending moment during the tie beam construction process, improving the spanning capacity of the supports, and reducing the amount of materials used.

[0004] The present invention meets the stress requirements during the construction period and the needs of temporary navigation by improving the support arrangement process and the sling installation process. When the bridge position and the canal under the bridge are at an oblique angle, in order to meet the temporary span limit and minimize the impact on the existing waterway during construction, the tie beam installation bracket is arranged at an oblique angle to the bridge axis. After the bracket is arranged at an oblique angle, the left and right side components are asymmetrically segmented. According to the asymmetric deformation of the left and right side components under their own weight during the construction process, after the tie beams and arch ribs are installed, the hangers are first installed to level the left and right tie beams, and the bridge deck and crossbeams are installed after eliminating the impact of asymmetry.

[0005] The present invention provides a method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal, comprising the following steps:

[0006] S1: The left tie beam mounting bracket and the right tie beam mounting bracket of the arch bridge are arranged along the navigation direction of the canal channel under the bridge, and the connecting line of the left tie beam mounting bracket and the right tie beam mounting bracket is at an oblique angle to the bridge axis;

[0007] S2: After the left tie beam mounting bracket and the right tie beam mounting bracket are arranged obliquely, the left tie beam and the right tie beam are installed in asymmetric sections;

[0008] S3: After the left tie beam and the right tie beam are installed, the end cross beam is installed between the left tie beam and the right tie beam. After the overall frame is formed, the left tie beam mounting bracket and the right tie beam mounting bracket are connected to form an arch rib mounting bracket, and then the arch rib is installed on the arch rib mounting bracket;

[0009] S4: Due to the oblique arrangement of the supports, the left and right tie beams are segmented asymmetrically. Under their own weight, the deflections and deformations of the left tie beam installation segment one, the left tie beam installation segment two, the left tie beam installation segment three, the left tie beam installation segment four, the right tie beam installation segment one, the right tie beam installation segment two, the right tie beam installation segment three, and the right tie beam installation segment four are inconsistent. Hangers are installed between the arch ribs and the left and right tie beams. The hangers are used to tension and eliminate the deflections and deformations of the tie beam segments, so that the deformations of the left and right tie beams are the same, and then the standard beams and bridge decks are installed.

[0010] Further, in S2, the left tie beam and the right tie beam are installed in an asymmetric manner in sections, the left tie beam includes a left tie beam installation segment one, a left tie beam installation segment two, a left tie beam installation segment three, and a left tie beam installation segment four that are connected in sequence, and the right tie beam includes a right tie beam installation segment one, a right tie beam installation segment two, a right tie beam installation segment three, and a right tie beam installation segment four that are connected in sequence.

[0011] Furthermore, the left tie beam and the right tie beam are installed in asymmetric sections, which reduces the spacing between the installation brackets while meeting the navigation requirements, and shortens the installation lengths of the left tie beam installation segment two, the left tie beam installation segment three, the right tie beam installation segment two, and the right tie beam installation segment three.

[0012] Furthermore, in S2, the left tie beam and the right tie beam are installed by using a floating crane.

[0013] Furthermore, in S3, an asymmetric segmented method is used to complete the installation of the arch rib using a floating crane.

[0014] Furthermore, the arch rib includes a left arch rib and a right arch rib.

[0015] Furthermore, in S3 and S4, after the left tie beam, right tie beam and end cross beam are installed, the arch rib is installed first and the hanger is tensioned, and then the left tie beam installation bracket and the right tie beam installation bracket are removed. The load of the standard cross beam and the bridge deck is directly transferred to the arch rib through the hanger, and the temporary bracket left tie beam installation bracket and the right tie beam installation bracket do not need to bear the weight of the bridge deck. The load value of the temporary bracket is reduced, and the material consumption is reduced.

[0016] Further, in S3, the end cross beam is installed on the end cross beam mounting bracket.

[0017] Furthermore, in S3, the arch rib is connected to the arch foot sections at both ends during installation.

[0018] Furthermore, the arch foot section is installed on an arch foot section mounting bracket.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention reduces the number of brackets, reduces the bracket span while meeting the requirements of oblique navigation, and reduces the bending moment during the tie beam construction process. At the same time, by changing the construction process to install the tie beam, end cross beam and arch rib first and then install the hanger and perform the first tensioning, the load of the temporary bracket is reduced. The weight of the bridge deck and steel cross beam is directly transferred to the arch rib by the hanger. The bracket only bears the longitudinal beam of the tie beam and arch rib, which also improves the spanning capacity of the bracket and reduces the amount of materials used. The installation and construction problems of the oblique steel arch bridge across the canal are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a plan view of the tie beam installation in Example 1;

[0022] Figure 2 This is a schematic diagram of the installation of the tie beam in Example 1;

[0023] Figure 3 It is a schematic diagram of the deflection deformation of the tie beam installation in Example 1;

[0024] Figure 4 This is a schematic elevation diagram of the arch rib installation in Example 1.

[0025] Figure 5 This is a schematic elevation diagram of the tie beam for leveling by tensioning the suspender rod in Example 1;

[0026] Figure 6 Schematic diagram of the tie beam for leveling the hanger rod in Example 1;

[0027] Figure 7 This is a schematic diagram of the installation plan of the standard beam and the bridge deck in Example 1;

[0028] Figure 8 This is a schematic diagram of the installation of the standard beam and bridge deck in Example 1.

[0029] Figure markings: 1. left tie beam, 2. right tie beam, 3. arch rib, 4. hanger, 5. arch foot section, 6. end cross beam, 7. standard cross beam, 8. bridge deck, 9. arch foot section mounting bracket, 10. left tie beam mounting bracket, 11. right tie beam mounting bracket, 12. end cross beam mounting bracket, 13. arch rib mounting bracket, 14. navigation direction, 1-1. left tie beam mounting segment one, 1-2. left tie beam mounting segment two, 1-3. left tie beam mounting segment three, 1-4. left tie beam mounting segment four, 2-1. right tie beam mounting segment one, 2-2. right tie beam mounting segment two, 2-3. right tie beam mounting segment three, 2-4. right tie beam mounting segment four, 3-1. left arch rib, 3-2. right arch rib. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0031] Example 1

[0032] This embodiment provides a method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal, comprising the following steps:

[0033] S1: Figure 1 , 2 As shown in 3, the left tie beam mounting bracket 10 and the right tie beam mounting bracket 11 of the arch bridge are arranged along the navigation direction 14 of the canal channel under the bridge, and the connecting line of the left tie beam mounting bracket 10 and the right tie beam mounting bracket 11 is at an oblique angle to the bridge axis;

[0034] S2: After the left tie beam mounting bracket 10 and the right tie beam mounting bracket 11 are arranged obliquely, the left tie beam 1 and the right tie beam 2 are installed in an asymmetric segmented manner;

[0035] S3: Figure 4 , 5 As shown, after the left tie beam 1 and the right tie beam 2 are installed, the end cross beam 6 is installed between the left tie beam 1 and the right tie beam 2, and after the overall frame is formed, the left tie beam mounting bracket 10 and the right tie beam mounting bracket 11 are connected to form an arch rib mounting bracket 13, and then the arch rib 3 is installed on the arch rib mounting bracket 13;

[0036] S4: Figure 5 , 6 As shown in Figures 7 and 8, due to the oblique arrangement of the brackets, the left tie beam 1 and the right tie beam 2 are asymmetrically segmented. Under their own weight, the deflection deformation of the left tie beam installation segment 1-1, the left tie beam installation segment 2 1-2, the left tie beam installation segment 3 1-3, the left tie beam installation segment 4 1-4, the right tie beam installation segment 1 2-1, the right tie beam installation segment 2 2-2, the right tie beam installation segment 3 2-3, and the right tie beam installation segment 4 2-4 are inconsistent. A hanger 4 is installed between the arch rib 3 and the left tie beam 1 and the right tie beam 2. The hanger 4 is used to tension and eliminate the deflection deformation of the tie beam segments, so that the deformation of the left tie beam 1 and the right tie beam 2 is the same, and then the standard cross beam 7 and the bridge deck 8 are installed;

[0037] like Figure 3As shown, in a specific implementation, in S2, the left tie beam 1 and the right tie beam 2 are installed in an asymmetric segmented manner, the left tie beam 1 includes a left tie beam installation segment one 1-1, a left tie beam installation segment two 1-2, a left tie beam installation segment three 1-3, and a left tie beam installation segment four 1-4 connected in sequence, and the right tie beam 2 includes a right tie beam installation segment one 2-1, a right tie beam installation segment two 2-2, a right tie beam installation segment three 2-3, and a right tie beam installation segment four 2-4 connected in sequence.

[0038] In a specific implementation, the left tie beam 1 and the right tie beam 2 are installed in an asymmetric segmented manner, which reduces the spacing between the installation brackets while meeting the navigation requirement, and shortens the installation lengths of the left tie beam installation segment two 1-2, the left tie beam installation segment three 1-3, the right tie beam installation segment two 2-2, and the right tie beam installation segment three 2-3.

[0039] In a specific implementation, in S2, the left tie beam 1 and the right tie beam 2 are installed using a floating crane.

[0040] In a specific implementation, in S3, an asymmetric segmentation method is adopted to complete the installation of the arch rib 3 using a floating crane.

[0041] In a specific embodiment, the arch rib 3 includes a left arch rib 3-1 and a right arch rib 3-2.

[0042] In the specific implementation, in S3 and S4, after the left tie beam 1, the right tie beam 2 and the end cross beam 6 are installed, the arch rib 3 is installed first and the hanger 4 is tensioned, and then the left tie beam mounting bracket 10 and the right tie beam mounting bracket 11 are removed, and the load of the standard cross beam 7 and the bridge deck 8 is directly transferred to the arch rib 3 through the hanger 4, and the temporary bracket left tie beam mounting bracket 10 and the right tie beam mounting bracket 11 do not need to bear the weight of the bridge deck. The load value of the temporary bracket is reduced, and the material consumption is reduced.

[0043] In a specific implementation, in S3 , the end cross beam 6 is mounted on the end cross beam mounting bracket 12 .

[0044] In a specific implementation, in S3, the arch rib 3 is connected to the arch foot sections 5 at both ends during installation.

[0045] In a specific implementation, the arch foot segment 5 is mounted on an arch foot segment mounting bracket 9 .

[0046] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0047] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for installing and constructing a large section of a steel arch bridge with few supports across a canal, characterized in that: The following steps are involved: S1: The left tie beam mounting bracket (10) and the right tie beam mounting bracket (11) of the arch bridge are arranged along the navigation direction (14) of the canal channel under the bridge, and the connecting line of the left tie beam mounting bracket (10) and the right tie beam mounting bracket (11) is at an oblique angle to the bridge axis; S2: After the left tie beam mounting bracket (10) and the right tie beam mounting bracket (11) are arranged obliquely, the left tie beam (1) and the right tie beam (2) are installed in an asymmetrical segmented manner; S3: After the left tie beam (1) and the right tie beam (2) are installed, the end cross beam (6) is installed between the left tie beam (1) and the right tie beam (2), and after the overall frame is formed, the left tie beam mounting bracket (10) and the right tie beam mounting bracket (11) are connected to form an arch rib mounting bracket (13), and then the arch rib (3) is installed on the arch rib mounting bracket (13); S4: Install a hanger (4) between the arch rib (3) and the left tie beam (1) and the right tie beam (2), and use the hanger (4) to tension and eliminate the deflection deformation of the tie beam segment, so that the deformation of the left tie beam (1) and the right tie beam (2) are the same, and then install the standard cross beam (7) and the bridge deck (8).

2. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 1 is characterized in that: In S2, the left tie beam (1) and the right tie beam (2) are installed in an asymmetric manner in sections. The left tie beam (1) includes a left tie beam installation section one (1-1), a left tie beam installation section two (1-2), a left tie beam installation section three (1-3), and a left tie beam installation section four (1-4) connected in sequence. The right tie beam (2) includes a right tie beam installation section one (2-1), a right tie beam installation section two (2-2), a right tie beam installation section three (2-3), and a right tie beam installation section four (2-4) connected in sequence.

3. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 2 is characterized in that: The left tie beam (1) and the right tie beam (2) are installed in asymmetric sections, which reduces the spacing between the installation brackets while meeting the navigation requirements, and shortens the installation lengths of the left tie beam installation segment 2 (1-2), the left tie beam installation segment 3 (1-3), the right tie beam installation segment 2 (2-2), and the right tie beam installation segment 3 (2-3).

4. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 1 is characterized in that: In S2, the left tie beam (1) and the right tie beam (2) are installed by using a floating crane.

5. The method for installing and constructing a large section of a steel arch bridge with few supports across a canal according to claim 1 is characterized in that: In S3, an asymmetric segmented method is used to complete the installation of the arch rib (3) using a floating crane.

6. The method for installing and constructing a large section of a steel arch bridge with few supports across a canal according to claim 1 is characterized in that: The arch rib (3) comprises a left arch rib (3-1) and a right arch rib (3-2).

7. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 1 is characterized in that: In S3 and S4, after the left tie beam (1), the right tie beam (2) and the end cross beam (6) are installed, the arch rib (3) is installed first and the hanger (4) is tensioned, and then the left tie beam installation bracket (10) and the right tie beam installation bracket (11) are removed. The load of the standard cross beam (7) and the bridge deck (8) is directly transferred to the arch rib (3) through the hanger (4), and the temporary bracket left tie beam installation bracket (10) and the right tie beam installation bracket (11) do not need to bear the weight of the bridge deck.

8. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 1 is characterized in that: In S3, the end cross beam (6) is mounted on the end cross beam mounting bracket (12).

9. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 1 is characterized in that: In S3, the arch rib (3) is connected to the arch foot sections (5) at both ends during installation.

10. The method for installing and constructing a large section of a steel arch bridge with fewer supports across a canal according to claim 9 is characterized in that: The arch foot section (5) is mounted on an arch foot section mounting bracket (9).

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