Reinforced concrete pier with UHPC (Ultra High Performance Concrete) shell and built-in steel cylinder

Abstract

The utility model relates to the technical field of bridge engineering, in particular to a reinforced concrete pier with a UHPC (Ultra High Performance Concrete) shell and a built-in steel cylinder, which comprises a shell, a steel reinforcement framework and concrete, the steel reinforcement framework is positioned in the shell, the concrete is packaged between the shell and the steel reinforcement framework, and the shell comprises the steel cylinder and the UHPC shell fixedly arranged outside the steel cylinder; supporting steel plates are welded and fixed in the steel cylinder, and the supporting steel plates are perpendicular to the axis of the steel cylinder and symmetrically fixed to the inner wall of the steel cylinder. The ultra-high performance concrete and the steel cylinders are used as the shell of the pier, the mechanical property of the whole pier can be improved, the pier of the structure is simple in manufacturing process, temporary formworks do not need to be erected, pollution and noise are reduced, resources are saved, in addition, the shell can be prefabricated in a factory, and the construction period is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering technical field especially relates to a UHPC shell and built-in steel cylinder reinforced concrete pier. BACKGROUND

[0002] In recent years, with the continuous development of highway and city bridge construction industry in China, the overall construction level of bridge develops rapidly, and the pier column is one of the important components of the bridge, in addition to the requirement of having enough vertical load bearing capacity, it must also have enough ability to resist horizontal earthquake action, which leads to the fact that the existing reinforced concrete structure cannot meet the actual demand, in addition, the existing reinforced concrete structure needs to consume a large amount of resources in the manufacturing process, such as a large number of formwork and temporary supports need to be equipped during cast-in-place operation construction.

[0003] With the development of building materials, a kind of ultra-high performance concrete (UHPC, Ultra-High Performance Concrete) mainly composed of silica fume, cement, water reducing agent, fine aggregate and steel fiber and other materials appears, which has the characteristics of super high toughness, super high ductility and super long durability (more than 200 years), and can improve the performance of the pier column when used on the pier column, but the cost is high when used on a large scale, and the structure performance is also easy to waste. SUMMARY

[0004] Based on the above problems, the purpose of the utility model is to provide a UHPC shell and built-in steel cylinder reinforced concrete pier to solve the technical problems of weak performance of the existing reinforced concrete structure and large resource consumption.

[0005] The technical scheme adopted by the utility model is: a UHPC shell and built-in steel cylinder reinforced concrete pier, comprising: a shell body, a steel reinforcement framework located in the shell body and a concrete encapsulated between the shell body and the steel reinforcement framework, the shell body comprises: a steel cylinder and a UHPC shell fixedly arranged outside the steel cylinder.

[0006] Further, a support steel plate is welded and fixed inside the steel cylinder, the support steel plate is arranged perpendicularly to the axis of the steel cylinder and is symmetrically fixed on the inner wall of the steel cylinder.

[0007] Further, a plurality of grooves are arranged on the steel cylinder.

[0008] Further, the shell body is prefabricated in a factory.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] The utility model discloses a kind of reinforced concrete bridge piers of UHPC shell and built-in steel cylinder, including: shell and steel reinforcement framework in shell and concrete 4 encapsulated between shell and steel reinforcement framework.

[0011] In addition, the presence of UHPC can effectively prevent corrosion of the steel cylinder concrete bridge pier, the steel cylinder can increase the stiffness of the thin-walled UHPC shell, and a support steel plate is provided inside to prevent the UHPC shell from expanding and cracking when pouring the internal concrete. During the use stage, the double restraint effect of the UHPC pipe and the steel cylinder can better constrain the core concrete, the presence of the internal steel cylinder ensures the stiffness and ductility of the component, and the presence of the external UHPC pipe can reduce local buckling of the steel cylinder and achieve better corrosion resistance. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the shell and steel reinforcement framework of the utility model;

[0013] Figure 2 It is Figure 1 It is a structural schematic view of the shell and steel reinforcement framework of the utility model;

[0014] Figure 3 It is a structural schematic view of the shell and steel reinforcement framework of the utility model;

[0015] Figure 4 It is Figure 3 It is a structural schematic view of the shell and steel reinforcement framework of the utility model;

[0016] In the figure: 1, UHPC shell; 2, longitudinal reinforcement; 3, stirrup; 4, concrete; 5, steel cylinder; 6, support steel plate; 7, groove. DETAILED DESCRIPTION

[0017] The technical solutions adopted by the utility model will be clearly and completely explained below in combination with the drawings and specific embodiments of the specification.

[0018] The utility model provides a kind of reinforced concrete bridge pier of UHPC shell and built-in steel cylinder, including: shell and steel reinforcement framework in shell and concrete 4 encapsulated between shell and steel reinforcement framework;

[0019] It should be noted that the shape of the bridge pier can be set to cylindrical or conical table shape according to needs, and in the present embodiment, a conical table shape is taken as an example for illustration; Figures 1-4

[0020] Among them: steel reinforcement framework, including: multiple longitudinal reinforcement 2 and multiple stirrups 3 welded and fixed in the section of multiple longitudinal reinforcement 2 with multiple UHPC shell inner wall parallel arrangement multiple longitudinal reinforcement 2;

[0021] ​The shell comprises a steel cylinder 5 matched with the shape of the pier and a UHPC outer shell 1 fixedly arranged outside the steel cylinder 5.

[0022] In the embodiment, the shell is preferably prefabricated in a factory, and the manufacturing process is as follows: first, a steel formwork for pouring UHPC is manufactured according to the design size requirement, then UHPC is poured in the two-layer formwork, after the UHPC is solidified and reaches the design strength, the outer steel formwork is removed, the inner steel formwork is reserved as the steel cylinder 5 and is connected with the UHPC to form an integrated body, and the solidified UHPC becomes the UHPC outer shell 1 fixedly arranged outside the steel cylinder 5.

[0023] In addition, as a preferred technical solution, as shown in Figure 2 、 4 , a plurality of grooves 7 can be arranged on the steel cylinder 5 to improve the bonding strength between the steel cylinder 5 and the UHPC outer shell 1.

[0024] Further, in order to improve the shearing capacity of the steel cylinder 5, a supporting steel plate 6 is welded and fixed inside the steel cylinder 5, the supporting steel plate 6 is arranged perpendicularly to the axis of the steel cylinder 5 and is symmetrically fixed on the inner wall of the steel cylinder 5, and a plurality of supporting steel plates 6 can be arranged at a certain interval.

[0025] The manufacturing process of the utility model is as follows:

[0026] (1) structure size and material preparation.

[0027] The height, width and length of the pier are determined according to the design bearing capacity requirement, the concrete strength grade is determined, and the steel bars and steel plates used are determined.

[0028] (2) according to the design size requirement, a steel formwork for pouring UHPC is manufactured, then UHPC is poured in the two-layer formwork, after the UHPC is solidified and reaches the design strength, the outer steel formwork is removed, the inner steel formwork is reserved and connected with the UHPC to form an integrated body, and the shell composed of the UHPC outer shell 1 and the steel cylinder 5 is formed.

[0029] (3) binding the steel bar framework, the steel bar framework inside the pier is bound according to the design requirement.

[0030] (4) hoisting the bound steel bar framework and fixing it at the specified position and connecting it with the foundation.

[0031] (5) hoisting the shell, sleeving it outside the steel bar framework, fixing it inside the steel bar framework and fixing the lower part with the foundation.

[0032] (6) welding the supporting steel plate 6 inside the steel cylinder 5.

[0033] (7) pouring concrete 4 into the shell, and after the concrete 4 reaches the design strength, the whole manufacturing process is completed.

[0034] When the bridge pier section size is relatively large, the steel reinforcement framework can be bound in the shell, and the installation steps are as follows:

[0035] After the shell is hoisted and fixed, the steel reinforcement framework is bound in the shell, and after being fixed, the concrete 4 is poured in the shell, that is, the whole manufacturing process is completed.

[0036] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A reinforced concrete bridge pier with a UHPC shell and an internal steel cylinder, comprising: The shell and the steel reinforcement cage located inside the shell and the concrete (4) encapsulated between the shell and the steel reinforcement cage, characterized in that the shell comprises: a steel cylinder (5) and a UHPC shell (1) fixedly disposed outside the steel cylinder (5). The steel cylinder (5) is welded and fixed with a support steel plate (6) inside. The support steel plate (6) is set perpendicular to the axis of the steel cylinder (5) and is symmetrically fixed on the inner wall of the steel cylinder (5).

2. The reinforced concrete bridge pier with a UHPC shell and an internal steel cylinder according to claim 1, characterized in that, The steel cylinder (5) is provided with multiple grooves (7).

3. The reinforced concrete bridge pier with a UHPC shell and an internal steel cylinder according to claim 1, characterized in that, The shell is prefabricated in the factory.

Images