A prefabricated small box girder rapid construction method

Abstract

The application provides an assembled small box girder rapid construction method, and the specific steps are as follows: checking whether the small box girder formwork is deformed, correcting the deformed part to the design position; installing the bottom die and the tensioning pedestal, fixing the bottom die on the tensioning pedestal, and adjusting the levelness of the bottom die to be parallel to the ground; binding the bottom plate steel bar net of the small box girder and placing it on the bottom die; installing the side die, adjusting the angle of the side die to be perpendicular to the ground, installing the inner die and binding the web steel bar; binding the top plate steel bar net and connecting it with the web steel bar; pouring and curing the concrete; transporting the small box girder to the site, hoisting it by using a crane, and aligning the rabbet joints, and meanwhile, the rabbet joints are smeared with epoxy resin. The application has the beneficial effects that the traffic efficiency of the road is greatly improved, the inconvenience brought to the public travel due to the construction is reduced, and the smoothness and safety of the traffic are ensured.

Description

Technical Field

[0001] This invention relates to the field of box girder construction technology, and specifically to a rapid construction method for prefabricated small box girders. Background Technology

[0002] Small box girders have been widely used due to their excellent load-bearing performance and structural stability. With the increasing number of highway reconstruction and expansion projects in recent years, these projects often pass through densely populated urban areas, meaning the construction environment becomes exceptionally complex. They must not only deal with heavy traffic flow but also consider the living and travel needs of surrounding residents. Because urban areas have extremely low tolerance for traffic disruptions, coupled with the relatively tight project schedules, construction teams face unprecedented challenges.

[0003] In order to minimize disruption to citizens' daily travel while ensuring the safety of the public, construction teams often have only two options when constructing precast small box girders: one is to close the road, which would undoubtedly exacerbate urban traffic congestion and affect citizens' normal lives; the other is to build temporary sheds, which can alleviate traffic pressure to some extent, but also bring additional costs and safety risks.

[0004] Completing high-quality construction within a limited timeframe is a daunting task for any construction team. Traditional methods for transverse splicing of small box girders primarily employ wet joint technology. While this technology is mature and reliable, its construction process is cumbersome, involving multiple steps such as formwork erection, rebar tying, concrete pouring, and subsequent curing. Each step requires significant time and manpower, resulting in a relatively long construction cycle for wet joints, which is insufficient to meet current demands for rapid construction. Therefore, how to shorten the construction cycle and improve efficiency while ensuring construction quality has become a major challenge for construction teams. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this paper aims to solve the problem of long construction periods and traffic disruptions caused by the need for wet joints in traditional small box girder construction.

[0006] This invention provides a rapid construction method for prefabricated small box girders, the specific steps of which are as follows: S1: Check if the small box girder formwork is deformed, correct the deformed parts to the design position; and check and clean any residue on the formwork surface. S2: Install the bottom formwork and tensioning platform, fix the bottom formwork on the tensioning platform, and adjust the level of the bottom formwork to be parallel to the ground; S3: Tie the bottom plate steel mesh of the small box girder and place it on the bottom formwork; S4: Install the side formwork, adjust the angle of the side formwork to be perpendicular to the ground, install the inner formwork and tie the web reinforcement; S5: Tie the top slab reinforcement mesh and connect it to the web reinforcement; S6: Pour and cure the concrete, and tension the prestressing tendons when the concrete reaches the design strength. S7: Transport the small box girder to the site, hoist it with a crane, align its tongue and groove joints, and apply epoxy resin to the tongue and groove joints.

[0007] As a preferred embodiment, the tongue and groove joint in the longitudinal direction of the bridge adopts a sawtooth-shaped structure for connection, and the width of the tongue and groove joint should not be less than 100mm, and the depth should not be less than 1 / 6 of the beam height.

[0008] As a preferred embodiment, the bottom mold is bolted to the tensioning platform.

[0009] As a preferred embodiment, the connection between the top slab reinforcement mesh and the web reinforcement is by welding or binding.

[0010] The beneficial effects of this invention are as follows: (1) The construction method provided by the present invention does not require the traditional process of setting up formwork, tying steel bars and pouring concrete on site. It does not require blocking traffic or setting up cumbersome sheds. It not only greatly improves the efficiency of road traffic and reduces the inconvenience caused to the public by construction, but also ensures smooth and safe traffic.

[0011] (2) The present invention realizes the horizontal connection between adjacent small box girders. Compared with the traditional wet joint operation connection method, the sawtooth tongue and groove joint connection not only greatly improves the connection efficiency and reduces the complexity and uncertainty in the construction process, but also significantly improves the stability and durability of the entire structure, laying a solid foundation for the safety and long-term use of the road. Detailed Implementation

[0012] To illustrate the features of the present invention, the present invention will be further described below with reference to embodiments.

[0013] Example: This invention provides a rapid construction method for prefabricated small box girders, with the following specific steps: S1: Check if the small box girder formwork is deformed, correct the deformed parts to the design position; and check and clean any residue on the formwork surface. S2: Install the bottom formwork and tensioning platform, fix the bottom formwork on the tensioning platform, and adjust the level of the bottom formwork to be parallel to the ground; S3: Tie the bottom plate steel mesh of the small box girder and place it on the bottom formwork; S4: Install the side formwork, adjust the angle of the side formwork to be perpendicular to the ground, install the inner formwork and tie the web reinforcement; S5: Tie the top slab reinforcement mesh and connect it to the web reinforcement; S6: Pour and cure the concrete, and then tension it when the concrete reaches its design strength; S7: Transport the small box girder to the site, hoist it with a crane, align its tongue and groove joints, and apply epoxy resin to the tongue and groove joints.

[0014] Preferably, in this embodiment, the tongue and groove joint in the longitudinal direction of the bridge adopts a sawtooth-shaped structure for connection, and the tongue and groove joint has a width of 100mm and a depth of 1 / 6 of the beam height.

[0015] Preferably, in this embodiment, the bottom mold is fixedly connected to the tensioning platform with bolts.

[0016] Preferably, in this embodiment, the connection method between the top slab reinforcement mesh and the web reinforcement is welding.

[0017] 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 has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the present invention do not depart from the spirit of the present invention and should also fall within the protection scope of the claims of the present invention. Other related technical structures not disclosed in detail in the present invention are existing technologies in the field.

Claims

1. A rapid construction method for prefabricated small box girders, characterized in that, The specific steps are as follows: S1: Check if the small box girder formwork is deformed, correct the deformed parts to the design position; and check and clean any residue on the formwork surface. S2: Install the bottom formwork and tensioning platform, fix the bottom formwork on the tensioning platform, and adjust the level of the bottom formwork to be parallel to the ground; S3: Tie the bottom plate steel mesh of the small box girder and place it on the bottom formwork; S4: Install the side formwork, adjust the angle of the side formwork to be perpendicular to the ground, install the inner formwork and tie the web reinforcement; S5: Tie the top slab reinforcement mesh and connect it to the web reinforcement; S6: Pour and cure the concrete, and then tension the prestressing tendons when the concrete reaches the design strength. S7: Transport the small box girder to the site, hoist it with a crane, align its tongue and groove joints, and apply epoxy resin to the tongue and groove joints.

2. The rapid construction method for prefabricated small box girders according to claim 1, characterized in that: The tongue and groove joint in the longitudinal direction of the bridge adopts a sawtooth structure for connection. The width of the tongue and groove joint should not be less than 100mm and the depth should not be less than 1 / 6 of the beam height.

3. The rapid construction method for prefabricated small box girders according to claim 1, characterized in that: The bottom mold is bolted to the tensioning platform.

4. The rapid construction method for prefabricated small box girders according to claim 1, characterized in that: The connection between the top slab reinforcement mesh and the web reinforcement is by welding or binding.