CN204139054U - Pin-connected panel regeneration concrete filled steel tube Y type bridge pier - Google Patents

Abstract

The utility model discloses a kind of pin-connected panel regeneration concrete filled steel tube Y type bridge pier, be made up of Y shape steel tube, steel pipe binder and assembled flange welding, bridge pad is placed in Y type bridge pier both arms top; Y shape steel tube is as bridge pier pier shaft, and steel pipe binder is positioned at more than Y shape steel tube crotch and welds with Y shape steel tube two diverging arms, and there is assembled flange Y shape steel tube bottom; Regenerated aggregate concrete is built in Y shape steel tube inside.Pin-connected panel of the present utility model regeneration concrete filled steel tube Y type bridge pier can be applicable in city intersection bridge, saves conventional concrete bridge pier shuttering, the step such as Peng wire-ties, form removal, significantly can improve the speed of application of Y type bridge pier; Meanwhile, the utility model makes regenerated aggregate concrete be applied in bridge engineering, is conducive to applying and construction refuse resource of regeneration concrete, improves economic benefit.

Description

Assembled recycled steel pipe concrete Y-shaped bridge pier

technical field

The utility model belongs to the technical field of steel and concrete combined structure and mixed structure, and relates to special-shaped steel pipe concrete piers, in particular to an assembled regenerated steel pipe concrete Y-shaped bridge pier.

Background technique

Bridges such as urban viaducts and overpasses that pass multi-layer traffic are different from ordinary highway bridges. Traffic still needs to pass under the bridge, which has a relatively large limitation on the area occupied by the piers. Therefore, urban viaducts and overpasses usually use single-column or special-shaped piers. However, since single-column piers can usually only be arranged with a single support, resulting in weak anti-overturning ability of the bridge, and Y-shaped piers can be arranged with double supports on the top, thereby improving the anti-overturning ability of the bridge, so urban bridges often use Y-shaped piers. In the construction of ordinary concrete Y-shaped bridge piers, a series of processes such as erecting formwork, binding steel bars, pouring concrete, and dismantling formwork are required, which requires a lot of manpower and a long construction period, which has a great impact on traffic. At the same time, the Y-shaped pier is a special-shaped pier, and its formwork can only be specially made, and it cannot be reused after use, resulting in great waste. For this reason, it is urgent to design a new bridge pier structure to improve the construction speed of the special-shaped piers of urban bridges and reduce the construction cost.

Recycled concrete is an environmentally friendly concrete prepared by mixing recycled aggregate and new mortar. The recycled aggregate is formed by crushing, cleaning and grading waste concrete blocks. In recycled concrete, natural aggregates such as sand and gravel are partially or completely replaced by recycled aggregates. The promotion and application of recycled concrete is conducive to the recycling of construction waste, which meets the requirements of environmental protection and sustainable development. Making full use of recycled concrete can not only effectively reduce the amount of construction waste, reduce the pollution of construction waste to the natural environment, and play a role in protecting the environment. To achieve the purpose of saving natural sand and gravel resources, it has significant economic, social and environmental benefits. However, due to the influence of the old mortar attached to the recycled aggregate, compared with ordinary concrete, recycled concrete is more prone to microcracks under uniaxial pressure, and the uniaxial compressive strength of recycled concrete is generally lower than that of ordinary concrete, which affects its application. Recycled concrete cannot be applied to structures such as bridge piers that require high concrete pressure resistance.

Utility model content

The technical problem to be solved by the utility model is to provide an assembled regenerative steel pipe concrete Y-shaped bridge pier which meets the requirements of bearing capacity, good seismic performance, fast construction, low construction cost, economical and environmental protection.

In order to solve the above technical problems, the utility model adopts the following technical solutions: Assembled recycled steel pipe concrete Y-shaped bridge piers, including Y-shaped bridge piers, Y-shaped bridge piers are composed of Y-shaped steel pipes, steel pipe tie beams and assembled flanges welded, bridge supports On the top of the double arms of the Y-shaped bridge pier; the Y-shaped steel pipe is used as the pier body, the steel pipe tie beam is located above the bifurcation of the Y-shaped steel pipe and welded to the two forked arms of the Y-shaped steel pipe, and the bottom of the Y-shaped steel pipe has an assembled flange; Recycled aggregate concrete is poured inside the steel pipe.

The assembly flange contains 8 stiffeners, and 8 assembly bolt holes are reserved.

The assembled recycled steel tube concrete Y-shaped bridge pier also includes a concave cap, and the Y-shaped bridge pier is assembled and fixed with the concave cap through assembly bolts pre-embedded in the concave cap.

The diameter of the round steel pipe of the two forked arms of the Y-shaped steel pipe is more than 60cm larger than the maximum size of the bridge support.

The strength grade of recycled aggregate concrete shall not be lower than C35.

Recycled aggregate concrete is composed of new mortar and recycled aggregate, and recycled aggregate is composed of original natural aggregate and attached old mortar.

The steel content ratio of Y-shaped piers is 0.05-0.2.

In view of the problems existing in the application of recycled aggregate concrete and the needs of construction convenience and construction cost of urban bridge piers, the inventor designed an assembled recycled steel pipe concrete Y-shaped pier, which is welded by Y-shaped steel pipes, steel pipe tie beams and assembled flanges Composition, the bridge support is placed on the top of the double arms of the Y-shaped pier; the Y-shaped steel pipe is used as the pier body, the steel pipe tie beam is located above the bifurcation of the Y-shaped steel pipe and welded to the two forked arms of the Y-shaped steel pipe, and the bottom of the Y-shaped steel pipe has Assembled flange; recycled aggregate concrete is poured inside the Y-shaped steel pipe. The utility model utilizes the steel pipe to form wrapping constraints on the recycled aggregate concrete, improves the mechanical performance of the recycled aggregate concrete, improves its pressure bearing and anti-bias pressure ability, and improves the bearing capacity and shock resistance of the recycled concrete constrained by the steel pipe , so that the recycled concrete piers meet the mechanical performance requirements and can be used in bridge engineering; the filling of recycled concrete can improve the local buckling resistance of steel pipes. The assembled regenerative steel pipe concrete Y-shaped bridge pier of the utility model can be applied in urban overpass bridges, wherein the outsourcing steel pipe can be used as a concrete formwork, and the Y-shaped steel pipe can be quickly assembled on-site through assembled flanges, assembled bolts and concave caps, and poured in the pipe Recycled concrete saves the steps of conventional concrete pier formwork, tying steel bars, and formwork removal, which can greatly increase the construction speed of Y-shaped pier; at the same time, the utility model enables the application of recycled aggregate concrete in bridge engineering, which is beneficial to regeneration The popularization and application of concrete and the recycling of construction waste have improved economic benefits.

Description of drawings

Fig. 1 is a schematic diagram of the use state of the assembled recycled steel pipe concrete Y-shaped pier of the utility model.

Fig. 2 is a schematic top view of the Y-shaped bridge pier in Fig. 1 .

Fig. 3 is a schematic cross-sectional view of the connection between the Y-shaped pier and the concave cap in Fig. 1 .

Fig. 4 is a schematic diagram of recycled aggregate concrete in Fig. 1 .

In the figure: 1Y-shaped steel pipe, 2 steel pipe tie beam, 3 recycled aggregate concrete, 4 support, 5 assembled flange, 6 assembled bolt, 7 fixed concrete, 8 concave cap, 9 original natural aggregate, 10 old mortar, 11 New mortar.

Detailed ways

As shown in Figures 1 to 4, the assembled regenerative steel pipe concrete Y-shaped pier of the utility model includes a Y-shaped pier, and the Y-shaped pier is composed of a Y-shaped steel pipe 1, a steel pipe tie beam 2 and an assembled flange 5 welded together, and the bridge supports are 4 On the top of the double arms of the Y-shaped bridge pier; the Y-shaped steel pipe is used as the pier body, and the steel pipe tie beam is located above the bifurcation of the Y-shaped steel pipe and welded to the two bifurcated arms of the Y-shaped steel pipe. There is an assembly flange at the bottom of the Y-shaped steel pipe. The blue includes 8 stiffeners, and 8 assembly bolt holes are reserved; recycled aggregate concrete is poured inside the Y-shaped steel pipe 3.

Production process

The Y-shaped steel pipe is prefabricated in the factory, and the two forked arms circular steel pipes (diameter more than 60cm larger than the maximum size of the bridge support) are welded to the main steel pipe, and then the spliced flange bottom plate with 8 splicing bolt holes is connected to the bottom of the main steel pipe After welding, the flange stiffeners are welded to the main steel pipe and the flange bottom plate to form a Y-shaped steel pipe with spliced flanges at the bottom. Transport the Y-shaped steel pipe to the pier construction site, connect it with the concave cap 8 (pre-embedded splicing bolt 6) that has been constructed on site through the splicing bolt hole of the splicing flange, and then pour the fixed concrete 7. After the splicing of the Y-shaped steel pipes is completed, the steel pipe tie beams and the Y-shaped steel pipe arms are welded on site, and finally recycled aggregate concrete is poured into the Y-shaped steel pipes to form a Y-shaped pier. The recycled aggregate concrete is composed of new mortar 11 and recycled aggregate, and the recycled aggregate is composed of original natural aggregate 9 and attached old mortar 10 . The strength grade of recycled aggregate concrete is not lower than C35. According to the "Code for Design of Steel Concrete Composite Structures" (JGJ138-2001): the steel content of Y-shaped piers is within the range of 0.05-0.2.

design principle

The assembled recycled steel tube concrete Y-shaped bridge pier of the utility model can not only meet the requirement of bearing capacity, but also improve the strength and earthquake resistance of the constrained recycled concrete. Since recycled aggregate concrete is poured inside the steel pipe, under compression, the strength of the recycled concrete is increased through the restraint of the steel pipe, thereby increasing the bearing capacity of the recycled concrete, and at the same time improving the steel pipe’s ability to resist local buckling, specifically: when the axial force increases When the concrete has a certain Poisson's ratio, lateral deformation will occur. When the lateral deformation is constrained, the concrete inside the steel pipe is in a three-dimensional compression state, the development of concrete micro-cracks will be restricted, and the deformation performance will also be enhanced. Thus, the bearing capacity is improved; the interaction between the steel pipe and the concrete makes the failure of the concrete inside the steel pipe change from brittle failure to plastic failure, the ductility of the component is significantly improved, and the energy dissipation capacity is greatly improved, thereby improving the earthquake resistance; The concrete can effectively prevent the local buckling of the steel pipe and improve the buckling resistance of the steel pipe.

Claims (7)

1. An assembled type recycled steel pipe concrete Y-shaped pier, comprising a Y-shaped pier, is characterized in that: said Y-shaped pier is made up of Y-shaped steel pipes, steel pipe tie beams and assembled flange welding, and the bridge bearing is placed on the Y-shaped pier The top of the double arm; the Y-shaped steel pipe is used as the pier pier body, the steel pipe tie beam is located above the bifurcation of the Y-shaped steel pipe and welded to the two forked arms of the Y-shaped steel pipe, and the bottom of the Y-shaped steel pipe has an assembled flange; the Y-shaped steel pipe Recycled aggregate concrete is poured inside the steel pipe. 2. The assembled regenerative steel tube concrete Y-shaped bridge pier according to claim 1, characterized in that: the assembled flange includes 8 stiffeners, and 8 assembled bolt holes are reserved. 3. The assembled recycled steel pipe concrete Y-shaped bridge pier according to claim 2, characterized in that it also includes a concave cap, and the Y-shaped bridge pier is assembled and fixed with the concave cap through the assembly bolts embedded in the concave cap. 4. The assembled recycled steel pipe concrete Y-shaped bridge pier according to claim 3, characterized in that: the diameter of the circular steel pipes of the two bifurcated arms of the Y-shaped steel pipe is more than 60cm larger than the maximum dimension of the bridge support. 5. The assembled recycled steel pipe concrete Y-shaped bridge pier according to claim 4, characterized in that: the strength grade of the recycled aggregate concrete is not lower than C35. 6. The assembled recycled steel pipe concrete Y-shaped pier according to claim 5, characterized in that: the recycled aggregate concrete is composed of new mortar and recycled aggregate, and the recycled aggregate is composed of original natural aggregate and attached old mortar . 7. The assembled recycled steel pipe concrete Y-shaped pier according to claim 6, characterized in that: the steel content of the Y-shaped pier is 0.05-0.2.