Double-platform arch rib encased concrete construction method

Abstract

The invention discloses a construction method for encased concrete of a double-platform arch bridge, which comprises the following steps of: providing a reinforcing steel bar construction platform and a template construction platform on each working face, firstly installing the reinforcing steel bar platforms in place to carry out section reinforcing steel bar installation construction, and after the construction is finished, moving the platforms to the next section to continuously carry out reinforcing steel bar installation until the reinforcing steel bar construction of the working face is finished. And the formwork platform is moved to the section where the reinforcing steel bars are installed, formwork installation and concrete pouring are conducted, and the effect of line production of construction of the externally-wrapped concrete section is achieved.

Description

Technical Field

[0001] The invention relates to the field of arch bridge construction, and in particular to a double-platform arch bridge outer concrete construction method. Background Art

[0002] Rigid skeleton arch bridges are widely used in the design and construction of long-span bridges due to their high structural rigidity and light weight. As the key load-bearing component of the arch bridge, the arch ring has an important impact on the safety and service life of the bridge due to its stress performance and consistency. Rigid skeleton outsourcing concrete arch ring is a widely used, mature and reliable construction method. After the outsourcing concrete pouring is completed and the strength is obtained, it becomes the load-bearing main body. The rigid arch skeleton is buried in the concrete, which increases the bearing capacity and toughness of the concrete arch ring. Its construction technology and quality control are important links to ensure the stability and safety of the arch bridge. The stress during the outsourcing concrete construction stage is complex, which has a great impact on the stress of the rigid skeleton arch ring. Therefore, a jumping balanced loading construction method of multiple pouring in rings and sections is adopted to control it.

[0003] During the construction of the bottom and web ring of the arch bridge external concrete, a single hanging platform or multiple hanging platforms are usually used to meet the requirements of working surface construction.

[0004] Single platform construction method: first place the outsourced formwork on a single platform, use the lifting equipment to lift the platform to the working surface, and then the workers will carry out the steel bar, formwork, and concrete construction of this section on the platform. After the construction is completed, the formwork will be removed and placed on the platform, and the platform will be moved to the next section by the lifting equipment to continue the steel bar, formwork, and concrete construction in sequence ( Figure 1 ), but this operation method does not fully utilize the working surface. The reinforcement, formwork, and concrete operation teams carry out construction intermittently, the process conversion efficiency is low, the construction progress is slow, and the overall construction period of the outsourced concrete is seriously affected.

[0005] Multi-platform construction method: Assemble all the templates of the entire working surface and place them on the lifting platform. Use the lifting equipment to lift multiple platforms to the designed position. The workers will carry out the steel bars, templates and concrete construction of the entire working surface on the platform. After the construction is completed, use the lifting equipment to lower and dismantle. Figure 2 ). The multi-platform parallel operation mode is complicated in organization and management, requires too much resources, and has high construction costs, which is not economical. Summary of the invention

[0006] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a double-platform arch bridge outsourcing concrete construction method. Provide a steel bar construction platform and a template construction platform on each working surface. First, install the steel bar platform in place to install the segment steel bar. After the construction is completed, move the platform to the next segment to continue the steel bar installation until the steel bar construction of the current working surface is completed. Move the template platform to the segment where the steel bar has been installed to install the template and pour concrete, so that the outsourcing concrete segment construction can achieve the effect of flow operation.

[0007] The present invention is implemented in this way, constructing a double-platform arch bridge outsourcing concrete construction method, characterized in that: one steel bar construction platform and one template construction platform are provided on each working surface, the steel bar platform is first installed in place to carry out segment steel bar installation construction, after the construction is completed, the platform is moved to the next segment to continue steel bar installation, until the steel bar construction of the current working surface is completed; the template platform is moved to the segment where the steel bar has been installed to carry out template installation and concrete pouring, so that the outsourcing concrete segment construction can achieve the effect of flow operation; the specific construction process is as follows: (1) At the assembly site, select profiles according to the number of outsourced concrete construction working surfaces to process the steel bar hanging platform and the formwork hanging platform, ensuring that each working surface is equipped with one steel bar platform and one formwork platform. After the formwork platform is processed, the formwork of the outsourced concrete is assembled and placed on the formwork platform; (2) Use the lifting equipment to hoist the steel bar platform to the first construction section and fix it on the arch rib. The steel bar installation personnel will then install the steel bars for this section. (3) After the first section of the steel bar construction is completed, the steel bar platform is moved to the second section by lifting equipment for steel bar installation. After the construction is completed, the steel bar installers will carry out the steel bar construction of the next section in turn according to this process; (4) Use the lifting equipment to lift the formwork platform and the formwork to the first section, install the formwork and pour concrete; (5) After the concrete construction of the first section is completed, the formwork is removed and lowered to the formwork platform. The formwork platform and the formwork are moved to the next section where the steel bars have been installed using a lifting device. The formwork is installed and concrete is poured. The outer concrete pouring is completed in sequence according to this platform movement method.

[0008] The present invention has the following advantages: (1) The double-platform construction method can install the steel bars of the outsourced concrete first, and only the construction time of the formwork and concrete needs to be considered when planning the construction, which is conducive to the ring-by-ring and segmented construction of the outsourced concrete; (2) The double-platform construction method makes full use of each working surface, and the outsourced steel bars, formworks, and concrete work teams work in a flow line, with high process conversion efficiency and fast progress, which fundamentally speeds up the construction period of the outsourced concrete of the arch bridge; (3) The double-platform construction method only requires one steel bar platform and one formwork platform on each working surface; the resource allocation is streamlined, effective, and uniform, which reduces the idle time of equipment and operators and greatly reduces the construction cost; (4) The double-platform construction method has a single process and simple organization, which is more conducive to on-site management. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the single platform sequential operation method; Figure 2 Schematic diagram of multi-platform parallel operation method; Figure 3 Schematic diagram of dual-platform assembly line operation; Figure 4 Schematic diagram of the steel bar construction platform; Figure 5 Schematic diagram of the construction of segmental reinforcement in sequence; Figure 6 Schematic diagram of the dual-platform assembly line operation mode. DETAILED DESCRIPTION

[0010] The following will be combined with the attached Figure 1-Figure 6 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] The present invention provides a construction method for outer concrete of a double-platform arch bridge, wherein one steel bar construction platform and one template construction platform are provided on each working surface. The steel bar platform is first installed in place for segment steel bar installation construction. After the construction is completed, the platform is moved to the next segment to continue steel bar installation until the steel bar construction of the current working surface is completed. The template platform is moved to the segment where the steel bar has been installed to install the template and pour concrete, so that the outer concrete segment construction can achieve the effect of flow operation ( Figure 3 ).

[0012] The specific construction process is as follows: (1) At the assembly site, select profiles for processing steel bar hanging platforms and formwork hanging platforms according to the number of outsourced concrete construction working surfaces, ensuring that each working surface is equipped with one steel bar platform and one formwork platform. After the formwork platform is processed, the formwork of the outsourced concrete is assembled and placed on the formwork platform.

[0013] (2) Use the lifting equipment to hoist the steel bar platform to the first construction section and fix it on the arch rib. The steel bar installation personnel will install the steel bars of this section. Figure 4 ).

[0014] (3) After the first section of the steel bar construction is completed, the steel bar platform is moved to the second section by lifting equipment for steel bar installation. After the construction is completed, the steel bar installers will carry out the steel bar construction of the next section in turn according to this process. Figure 5 ).

[0015] (4) Use the lifting equipment to lift the formwork platform and the formwork to the first section position, install the formwork and pour concrete ( Figure 6 ).

[0016] (5) After the concrete construction of the first section is completed, the formwork is removed and lowered to the formwork platform. The formwork platform and the formwork are moved to the next section where the reinforcement installation has been completed using a lifting device. The formwork is installed and concrete is poured. The outer concrete pouring is completed in sequence according to this platform movement method.

[0017] The corresponding advantages of this application are as follows: (1) The double-platform construction method allows the installation of steel bars for outsourced concrete to be carried out first, and only the construction time of formwork and concrete needs to be considered during the construction plan, which is conducive to the ring-by-ring and segmented construction of outsourced concrete; (2) The double-platform construction method makes full use of each working surface, and the outsourced steel bar, formwork, and concrete operation teams work in a flow line, with high process conversion efficiency and fast progress, which fundamentally speeds up the construction period of outsourced concrete for arch bridges; (3) The double-platform construction method only requires one steel bar platform and one formwork platform on each working surface; resource allocation is streamlined, effective, and uniform, which reduces idle time for equipment and operators and greatly reduces construction costs; (4) The double-platform construction method has a single process and simple organization, which is more conducive to on-site management.

[0018] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-platform arch bridge outer concrete construction method, characterized in that; Provide one steel bar construction platform and one formwork construction platform on each working surface. First, install the steel bar platform in place to install the segment steel bar. After the construction is completed, move the platform to the next segment to continue the steel bar installation until the steel bar construction of this working surface is completed; move the formwork platform to the segment where the steel bar has been installed to install the formwork and pour concrete, so that the outsourced concrete segment construction can achieve the effect of flow operation; the specific construction process is as follows: (1) At the assembly site, select profiles according to the number of outsourced concrete construction working surfaces to process the steel bar hanging platform and the formwork hanging platform, ensuring that each working surface is equipped with one steel bar platform and one formwork platform. After the formwork platform is processed, the formwork of the outsourced concrete is assembled and placed on the formwork platform; (2) Use the lifting equipment to hoist the steel bar platform to the first construction section and fix it on the arch rib. The steel bar installation personnel will then install the steel bars for this section. (3) After the first section of the steel bar construction is completed, the steel bar platform is moved to the second section by lifting equipment for steel bar installation. After the construction is completed, the steel bar installers will carry out the steel bar construction of the next section in turn according to this process; (4) Use the lifting equipment to lift the formwork platform and the formwork to the first section, install the formwork and pour concrete; (5) After the concrete construction of the first section is completed, the formwork is removed and lowered to the formwork platform. The formwork platform and the formwork are moved to the next section where the reinforcement installation has been completed using a lifting device. The formwork is installed and concrete is poured. The outer concrete pouring is completed in sequence according to this platform movement method.

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