Synchronous construction method for tower beams of fabricated concrete cable-stayed bridge

Abstract

The invention relates to the technical field of cable-stayed bridge tower beam construction, and provides a fabricated concrete cable-stayed bridge tower beam synchronous construction method which is characterized by comprising the following specific steps: S1, constructing a foundation part, and synchronously prefabricating a main beam and a bridge tower section in a beam field; s2, main piers and side piers are constructed, and main beams and bridge tower sections are synchronously prefabricated in a beam field; s3, constructing a pier top main beam of the main pier, and constructing a bridge tower at the same time; determining the assembly elevation of the main beam and the bridge tower; s4, prefabricating main beam sections through cantilever assembly, and tensioning internal prestressed tendons and stay cables of the corresponding section beams; s5, the steps S3 and S4 are repeated until the main beams are closed; s6, tensioning the closure section prestressed tendons and the external prestressed tendons; and S7, paving a bridge deck, and installing ancillary facilities. The method has the beneficial effects that synchronous construction of the tower and the beam is realized, so that the construction period of the whole project is remarkably shortened, the quality of the project is greatly improved, and the stability and safety of the structure are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of cable-stayed bridge tower and beam construction, and in particular to a method for synchronously constructing an assembled concrete cable-stayed bridge tower and beam. Background Art

[0002] Concrete cable-stayed bridges have become the preferred bridge type in many large-span bridge construction projects due to their superior cost-effectiveness and excellent mechanical properties. However, to ensure that the alignment and internal forces of the bridge strictly meet the design requirements, bridge construction monitoring has become an indispensable part. In the past, the traditional construction methods of cable-stayed bridges mostly followed the "tower first, then beam" model, that is, the construction of the bridge tower was completed first, and then the main beam was installed. However, with the continuous advancement of science and technology, especially the rapid development of many fields such as material science, structural mechanics and construction technology, the construction methods of cable-stayed bridges have become increasingly diversified, aiming to improve construction efficiency, reduce costs and optimize overall performance.

[0003] In this context, the synchronous construction of tower and beam is a relatively new construction method. The core of this method is that when the bridge tower construction reaches a certain height, it no longer waits for the bridge tower to be fully completed, but starts the construction of the bridge tower and the main beam at the same time. This parallel construction method not only significantly shortens the construction period, but also effectively saves costs, which is of great significance for improving the overall economic benefits of cable-stayed bridge construction.

[0004] However, there are also many disadvantages in the synchronous construction of towers and beams. Due to the complexity and interdependence of the construction process, this method faces the technical difficulty of sudden changes in the curvature of the bridge tower line. The solution to these problems is not only related to the construction quality of the bridge, but also directly affects the safety and durability of the bridge. Therefore, in order to overcome the problems existing in the synchronous construction of towers and beams, it is imperative to develop a more efficient and reliable method for synchronous construction of towers and beams of concrete cable-stayed bridges. Summary of the invention

[0005] Aiming at the deficiencies of the existing technology, the problem of sudden change of curvature of the bridge tower line during the synchronous construction of the existing tower and beam is solved.

[0006] The present invention provides a method for synchronously constructing towers and beams of an assembled concrete cable-stayed bridge, and the specific steps are as follows: S1: Construction of the foundation part, simultaneous prefabrication of main beams and bridge tower segments in the beam yard; S2: construct the main pier and side pier, and simultaneously prefabricate the main beam and bridge tower segments in the beam yard; S3: construct the main beam on the top of the main pier and the bridge tower at the same time; determine the assembly elevation of the main beam and the bridge tower; S4: cantilever assemble prefabricated main beam segments, and tension the internal prestressed tendons and inclined cables of the corresponding segment beams; S5: Repeat steps S3 and S4 until the main beam is connected; S6: tensioning and closure section prestressed tendons and external prestressed tendons; S7: Bridge deck paving and installation of ancillary facilities.

[0007] As a preferred solution, the main beams at the main piers can be cast in situ or prefabricated; shear keys are provided between the main beams for connection, and the tongue-and-groove joints between the main beams are sealed with epoxy resin.

[0008] As a preferred solution, the prefabricated bridge tower segments are fixed with shear keys, and epoxy resin is applied to seal the prefabricated bridge tower segments.

[0009] As a preferred solution, the prefabricated bridge tower segment is provided with main reinforcement, the bridge tower shear key is located inside the bridge tower main reinforcement, and the bridge tower main reinforcement is provided with a sleeve connection.

[0010] As a preferred solution, the main pier is connected to the main beam by a support.

[0011] As a preferred solution, the cross section of the prefabricated segment is kept dry before applying the epoxy resin; after assembly, rainproof facilities are used at the application site to prevent rainwater from intruding.

[0012] As a preferred solution, the prestressed grouting outside the prestressed tendons adopts a vacuum grouting process, and a rust inhibitor is added to the grouting material.

[0013] The beneficial effects of the present invention are: (1) The present invention adopts the short-line construction technology, which not only realizes the synchronous construction of the tower and the beam, thereby significantly shortening the construction period of the entire project, but also greatly improves the quality of the project and ensures the stability and safety of the structure. More importantly, it effectively reduces the various adverse effects caused by the aging of concrete materials, so that the controllability of the project quality is greatly enhanced. In addition, the present invention also promotes the standardization and factory process of construction, so that each construction link can be carried out according to unified standards, greatly improving the construction efficiency, and achieving the significant purpose of reducing costs and increasing efficiency, bringing a double improvement to the economic and social benefits of the project.

[0014] (2) The present invention sets external prestressed tendons in the bridge structure. This innovative design not only effectively solves the problem of excessive beam height in traditional designs, but also avoids the difficulties that may be encountered when arranging internal prestressed tendons, such as narrow space and complex arrangement. By setting external prestressed tendons, the stress performance of the bridge has been significantly optimized, the bearing capacity has been effectively improved, and the construction difficulty and cost have been greatly reduced. DETAILED DESCRIPTION

[0015] To illustrate the features of the present invention, the present invention will be further described below in conjunction with embodiments.

[0016] Example: The embodiment of the present invention provides a method for synchronously constructing towers and beams of an assembled concrete cable-stayed bridge, and the specific steps are as follows: S1: Construction of the foundation part, simultaneous prefabrication of main beams and bridge tower segments in the beam yard; S2: construct the main pier and the side pier. The main beams at the main pier can be cast in situ or prefabricated. Shear keys are set between the main beams. The tongue-and-groove joints between the main beams are sealed with epoxy resin. The main beams and bridge tower segments are prefabricated in the beam yard at the same time. S3: construct the main beam on the top of the main pier and the bridge tower at the same time; determine the assembly elevation of the main beam and the bridge tower; S4: cantilever assemble prefabricated main beam segments, and tension the internal prestressed tendons and inclined cables of the corresponding segment beams; S5: Repeat steps S3 and S4 until the main beam is connected; S6: tensioning and closure section prestressed tendons and external prestressed tendons; S7: Bridge deck paving and installation of ancillary facilities.

[0017] As a preferred solution, the prefabricated bridge tower segments are fixed with shear keys, and epoxy resin is applied to seal the prefabricated bridge tower segments.

[0018] As a preferred solution, the prefabricated bridge tower segment is provided with main reinforcement, the bridge tower shear key is located inside the bridge tower main reinforcement, and the bridge tower main reinforcement is provided with a sleeve connection.

[0019] As a preferred solution, the main pier is connected to the main beam by a support.

[0020] As a preferred solution, the cross section of the prefabricated segment is kept dry before applying the epoxy resin; after assembly, rainproof facilities are used at the application site to prevent rainwater from intruding.

[0021] As a preferred solution, the prestressed grouting outside the prestressed tendons adopts a vacuum grouting process, and a rust inhibitor is added to the grouting material.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that any changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of the claims of the present invention. Other related technical structures not fully disclosed in the present invention are prior art in the art.

Claims

1. A method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge, characterized in that: The specific steps are as follows: S1: Construction of the foundation part, simultaneous prefabrication of main beams and bridge tower segments in the beam yard; S2: construct the main pier and side pier, and simultaneously prefabricate the main beam and bridge tower segments in the beam yard; S3: Construct the main beam on the top of the main pier and the bridge tower at the same time; determine the assembly elevation of the main beam and the bridge tower; S4: cantilever assemble prefabricated main beam segments, and tension the internal prestressed tendons and inclined cables of the corresponding segment beams; S5: Repeat steps S3 and S4 until the main beam is connected; S6: tensioning and closure section prestressed tendons and external prestressed tendons; S7: Bridge deck paving and installation of ancillary facilities.

2. The method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge according to claim 1, characterized in that: The main beams at the main piers can be cast in situ or prefabricated; shear keys are arranged between the main beams for connection, and the tongue-and-groove joints between the main beams are sealed by applying epoxy resin.

3. The method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge according to claim 1, characterized in that: The prefabricated bridge tower segments are fixed with shear keys, and epoxy resin is applied between the prefabricated bridge tower segments for sealing.

4. The method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge according to claim 1, characterized in that: The prefabricated bridge tower segment is provided with main reinforcement, the bridge tower shear key is located inside the bridge tower main reinforcement, and the bridge tower main reinforcement is provided with a sleeve connection.

5. The method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge according to claim 1, characterized in that: The main pier is connected to the main beam by a support.

6. The method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge according to claim 2, characterized in that: The cross section of the prefabricated segment should be kept dry before applying epoxy resin; after assembly, rainproof facilities should be used at the application site to prevent rainwater from intruding.

7. The method for synchronous construction of tower and beam of assembled concrete cable-stayed bridge according to claim 1, characterized in that: The prestressed grouting outside the prestressed tendons adopts a vacuum grouting process, and a rust inhibitor is added to the grouting material.