Construction method for closure section of open-web steel inclined strut continuous rigid frame bridge

Abstract

The invention provides a construction method for a closure section of an open-web type steel inclined strut continuous rigid frame bridge. The construction method comprises the steps that S1, vertical auxiliary locking devices are installed at the corresponding positions of an upper chord and a lower chord of the front section of the closure section of the open-web type steel inclined strut continuous rigid frame bridge; s2, concrete pouring of a lower chord steel-concrete combined section is completed through a hanging basket system; s3, an upper chord concrete pouring formwork is erected above the lower chord steel-concrete combined section, and concrete pouring of the upper chord closure section is completed; and S4, in the steps S2 to S3, a vertical auxiliary locking device and a temporary inhaul cable are used for bearing the self weight of the lower chord steel-concrete combined section, the upper chord concrete pouring formwork and the construction load. The open-web type steel inclined strut continuous rigid frame bridge closure section construction method has the advantages of being convenient to construct, low in cost, short in period, safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for a closure section of a hollow steel diagonal brace continuous rigid frame bridge. Background Art

[0002] The deadweight of concrete in the joint section of a hollow steel diagonal braced continuous rigid frame bridge is heavy, and currently, hanging basket suspended pouring is generally used for construction. The hanging basket is often used to cast the lower chord steel-concrete joint section first, and then the upper chord concrete is further cast with the help of the hanging basket to complete the construction of the upper and lower chord joint sections. However, during the construction process, the deadweight of the upper and lower chord concrete, the formwork and the construction load are all borne by the hanging basket, which has a high construction risk and a high requirement on the tonnage of the hanging basket. There are construction safety hazards, which increases construction costs and is not conducive to improving construction efficiency. Summary of the invention

[0003] In view of this, the present invention aims to propose a method for constructing a closure section of a hollow-type steel diagonal brace continuous rigid frame bridge, so as to solve the problem of potential construction safety hazards in the existing method for constructing a closure section of a hollow-type steel diagonal brace continuous rigid frame bridge.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A method for constructing a closure section of a hollow steel diagonal brace continuous rigid frame bridge, comprising:

[0006] Step S1, installing a vertical auxiliary locking device at the corresponding positions of the upper and lower chords of the previous segment of the closure section of the open-web steel diagonal brace continuous rigid frame bridge;

[0007] Step S2, using the hanging basket system to complete the concrete pouring of the lower chord steel-concrete combined section;

[0008] Step S3, setting up an upper chord concrete pouring formwork above the lower chord steel-concrete combined section, and completing the concrete pouring of the upper chord joint section;

[0009] Step S4: In steps S2 to S3, the vertical auxiliary locking device and temporary cables are used to bear the deadweight of the lower chord steel-concrete combined section, the upper chord concrete pouring formwork and the construction load.

[0010] Furthermore, after step S4, the method further includes:

[0011] Step S5: connecting the lower chord steel-concrete combined section and the upper chord closure section by using a temporary locking device.

[0012] Furthermore, the temporary locking devices are arranged in at least two groups at intervals.

[0013] Furthermore, the temporary locking device includes a temporary locking facade component and a temporary locking side component; the temporary locking facade component is arranged corresponding to the middle part of the lower chord steel-concrete combined section and the upper chord joint section; the temporary locking side component is arranged corresponding to the left and right sides of the lower chord steel-concrete combined section and the upper chord joint section.

[0014] Furthermore, the temporary locking facade component and the temporary locking side component are both made of precision-rolled threaded steel.

[0015] Furthermore, two vertical auxiliary locking devices are provided on the left and right sides of the upper and lower chords of the preceding segment of the closure section of the hollow steel diagonal brace continuous rigid frame bridge.

[0016] Furthermore, the vertical auxiliary locking device includes a top plate sling and a web plate sling, the top plate sling is arranged corresponding to the top plate of the lower chord of the previous segment, and the web plate sling is arranged corresponding to the web of the previous segment.

[0017] Furthermore, the upper chord of the previous segment is provided with a distribution beam for connecting the top plate sling and the web plate sling.

[0018] Furthermore, a cushion beam and a pad are provided between the distribution beam and the upper chord of the previous segment.

[0019] Furthermore, the lower chord of the previous segment is provided with lifting ears cooperating with the top plate sling and the web plate sling, and the positions corresponding to the lifting ears on the lower chord of the previous segment are provided with reinforcing plates.

[0020] Compared with the prior art, the method for constructing the closure section of a hollow steel diagonal brace continuous rigid frame bridge described in the present invention has the following advantages:

[0021] The method for constructing the closure section of a hollow steel diagonal brace continuous rigid frame bridge described in the present invention has the advantages of convenient construction, low cost, short cycle, safety and reliability. A vertical auxiliary locking device is installed at the corresponding positions of the upper and lower chords of the previous segment of the closure section to share the load generated when pouring the upper chord concrete of the closure section, complete the pouring of the closure section concrete, reduce the construction tonnage of the hanging basket system, and at the same time reduce the cable force anchored to the main pier body, avoid the risk of large-tonnage hanging basket construction, effectively improve the bridge closure accuracy, have good social and economic benefits, and provide a reference for the construction of the closure section of a hollow steel diagonal brace continuous rigid frame bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1It is a schematic diagram of the process of a method for constructing a closure section of a hollow steel diagonal brace continuous rigid frame bridge according to an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a hanging basket system in a method for constructing a closure section of a hollow steel diagonal brace continuous rigid frame bridge according to an embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a vertical auxiliary locking device in a method for constructing a closure section of a hollow steel diagonal brace continuous rigid frame bridge according to an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a temporary locking device in a method for constructing a closure section of a hollow steel diagonal brace continuous rigid frame bridge according to an embodiment of the present invention;

[0027] Figure 5 for Figure 4 Schematic diagram of the structure at AA in the middle.

[0028] Description of reference numerals:

[0029] 1. Lower chord of the previous segment; 2. Upper chord of the previous segment; 3. Vertical auxiliary locking device; 4. Hanging basket system; 5. Upper chord joint section; 6. Lower chord steel-concrete joint section; 7. Temporary locking device; 8. Temporary cables; 9. Top plate sling; 10. Web plate sling; 11. Distribution beam; 12. Pad beam; 13. Copy pad; 14. Lifting lug; 15. Reinforcement plate; 16. Temporary locking of facade components; 17. Temporary locking of side components. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] The embodiment of the present invention provides a method for constructing the joint section of a hollow steel brace continuous rigid frame bridge. The upper chord concrete box girder of the hollow steel brace continuous rigid frame bridge is constructed by cantilever casting with a hanging basket. The lower chord steel brace is hoisted in sections with the help of the diamond truss of the upper chord hanging basket. A temporary cable structure is set at the position of the steel brace to anchor it to the main pier body. After research, a vertical auxiliary locking device is set for the last section of the steel brace. Figures 1 to 5 As shown, this construction method specifically includes the following steps:

[0032] Step S1, install a vertical auxiliary locking device 3 at the corresponding positions of the upper and lower chords of the previous segment of the closure section of the open-web steel diagonal brace continuous rigid frame bridge. Specifically, the installation position of the vertical auxiliary locking device 3 needs to avoid the hanging basket running track and the main beam corrugated pipe.

[0033] Step S2, using the hanging basket system 4 to complete the concrete pouring of the lower chord steel-concrete combined section 6. Specifically, after the concrete is poured, the hanging basket system 4 is lowered after the concrete strength reaches the construction standard.

[0034] Step S3, setting up an upper chord concrete pouring formwork above the lower chord steel-concrete combined section 6, and completing the concrete pouring of the upper chord joint section 5.

[0035] Step S4, in steps S2 to S3, the vertical auxiliary locking device 3 and the temporary cable 8 are used to bear the deadweight of the lower chord steel-concrete combined section 6, the upper chord concrete pouring formwork and the construction load.

[0036] Step S5, connecting the lower chord steel-concrete combined section 6 and the upper chord closure section 5 by using a temporary locking device 7.

[0037] By temporarily locking the lower chord steel brace with a vertical auxiliary locking device 3, the tonnage restriction of the hanging basket system 4 due to the weight of the closure section beam can be reduced, and the tension of the cables anchored to the main pier can be reduced. Compared with the existing technology, this construction method has the advantages of low construction cost, short cycle, safety and reliability, reduces the risk of large-tonnage hanging basket construction, effectively improves the accuracy of bridge closure, and has good social and economic benefits.

[0038] Preferably, at least two groups of temporary locking devices 7 are arranged at intervals. By arranging multiple groups of temporary locking devices 7 at intervals, it is beneficial to improve the connection stability between the lower chord steel-concrete combined section 6 and the upper chord joint section 5, and ensure construction safety.

[0039] Exemplarily, two groups of temporary locking devices 7 are arranged at intervals along the length direction of the rigid frame bridge, and each group of temporary locking devices 7 includes a temporary locking facade component 16 and a temporary locking side component 17; the temporary locking facade component 16 is arranged corresponding to the middle part of the lower chord steel-concrete joint section 6 and the upper chord joint section 5; the temporary locking side component 17 is arranged corresponding to the left and right sides of the lower chord steel-concrete joint section 6 and the upper chord joint section 5.

[0040] In actual application, both the temporary locking facade assembly 16 and the temporary locking side assembly 17 are made of finely rolled threaded steel. The lower chord steel-concrete combination section 6 and the upper chord joint section 5 are provided with mounting holes for facilitating the installation of finely rolled threaded steel, and both ends of the finely rolled threaded steel passing through the mounting holes are fixed by locking nuts. Those skilled in the art may also choose other ways to install finely rolled threaded steel according to actual needs, so as to realize the connection of the lower chord steel-concrete combination section 6 and the upper chord joint section 5 by finely rolled threaded steel, which will not be described in detail here.

[0041] Preferably, two vertical auxiliary locking devices 3 are provided corresponding to the left and right sides of the upper and lower chords of the previous segment of the hollow steel diagonal brace continuous rigid frame bridge joint section. By providing two vertical auxiliary locking devices 3, the force can be dispersed and the force on the left and right sides of the upper and lower chords of the previous segment can be balanced, ensuring that the vertical auxiliary locking devices 3 can continuously and stably bear the self-weight of the lower chord steel-concrete combined section 6, the upper chord concrete casting template and construction load during the construction process.

[0042] Exemplarily, the vertical auxiliary locking device 3 includes a top plate sling 9 and a web plate sling 10, wherein the top plate sling 9 is arranged corresponding to the top plate of the lower chord 1 of the previous segment, and the web plate sling 10 is arranged corresponding to the web of the previous segment. By separately arranging the top plate sling 9 and the web plate sling 10, not only can the limiting effect of the vertical auxiliary locking device 3 on the lower chord 1 of the previous segment be improved, thereby improving the stability of the lower chord 1 of the previous segment, but also the connection stability and structural strength of the upper and lower chords of the previous segment can be further improved, thereby ensuring the safety of subsequent construction.

[0043] In actual application, the upper chord 2 of the previous segment is provided with a distribution beam 11 for connecting the top plate sling 9 and the web plate sling 10, and a cushion beam 12 and a pad 13 are further provided between the distribution beam 11 and the upper chord 2 of the previous segment. The provision of the distribution beam 11, the cushion beam 12 and the pad 13 is conducive to further dispersing the force, improving the stability of the top plate sling 9 and the web plate sling 10 on the upper chord 2 of the previous segment, and ensuring that the top plate sling 9 and the web plate sling 10 can continue to limit the lower chord 1 of the previous segment.

[0044] Preferably, the lower chord 1 of the previous segment is provided with a lifting lug 14 that cooperates with the top plate sling 9 and the web plate sling 10, and the positions of the lower chord 1 of the previous segment corresponding to the lifting lug 14 are provided with a reinforcing plate 15. Exemplarily, the reinforcing plate 15 is fixed inside the lower chord 1 of the previous segment, and by providing the reinforcing plate 15 at the position corresponding to the lifting lug 14 on the lower chord 1 of the previous segment, the structural strength at the lifting lug 14 can be strengthened to ensure the stability of the connection between the sling and the lifting lug 14.

[0045] The method for constructing the closure section of a hollow steel diagonal brace continuous rigid frame bridge described in the present invention has the advantages of convenient construction, low cost, short cycle, safety and reliability. A vertical auxiliary locking device is installed at the corresponding positions of the upper and lower chords of the previous segment of the closure section to share the load generated when pouring the upper chord concrete of the closure section, complete the pouring of the closure section concrete, reduce the construction tonnage of the hanging basket system, and at the same time reduce the cable force anchored to the main pier body, avoid the risk of large-tonnage hanging basket construction, effectively improve the bridge closure accuracy, have good social and economic benefits, and provide a reference for the construction of the closure section of a hollow steel diagonal brace continuous rigid frame bridge.

[0046] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for constructing a closure section of a hollow steel diagonal brace continuous rigid frame bridge, characterized in that: include: Step S1, installing a vertical auxiliary locking device at the corresponding positions of the upper and lower chords of the previous segment of the closure section of the open-web steel diagonal brace continuous rigid frame bridge; Step S2, using the hanging basket system to complete the concrete pouring of the lower chord steel-concrete combined section; Step S3, setting up an upper chord concrete pouring formwork above the lower chord steel-concrete combined section, and completing the concrete pouring of the upper chord joint section; Step S4: In steps S2 to S3, the vertical auxiliary locking device and temporary cables are used to bear the deadweight of the lower chord steel-concrete combined section, the upper chord concrete pouring formwork and the construction load.

2. The method according to claim 1, characterized in that: After step S4, the method further includes: Step S5: connecting the lower chord steel-concrete combined section and the upper chord closure section by using a temporary locking device.

3. The method according to claim 2, characterized in that: The temporary locking devices are arranged in at least two groups at intervals.

4. The method according to claim 2 or 3, characterized in that: The temporary locking device includes a temporary locking facade component and a temporary locking side component; the temporary locking facade component is arranged corresponding to the middle part of the lower chord steel-concrete combined section and the upper chord joint section; the temporary locking side component is arranged corresponding to the left and right sides of the lower chord steel-concrete combined section and the upper chord joint section.

5. The method according to claim 4, characterized in that: The temporary locking facade component and the temporary locking side component are both made of precision-rolled threaded steel.

6. The method according to claim 1, characterized in that: The vertical auxiliary locking devices are provided in pairs on the left and right sides of the upper and lower chords of the preceding segment of the closure section of the hollow steel diagonal brace continuous rigid frame bridge.

7. The method according to claim 6, characterized in that: The vertical auxiliary locking device includes a top plate sling and a web plate sling. The top plate sling is arranged corresponding to the top plate of the lower chord of the previous segment, and the web plate sling is arranged corresponding to the web of the previous segment.

8. The method according to claim 7, characterized in that: The upper chord of the previous segment is provided with a distribution beam for connecting the top plate sling and the web plate sling.

9. The method according to claim 8, characterized in that: A cushion beam and a cushion are also provided between the distribution beam and the upper chord of the previous segment.

10. The method according to any one of claims 7 to 9, characterized in that: The lower chord of the previous segment is provided with lifting ears that cooperate with the top plate sling and the web plate sling, and the positions corresponding to the lifting ears on the lower chord of the previous segment are provided with reinforcement plates.

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