Prestressed box girder prefabricated part and tensioning structure thereof
The precast pre-stressed box girder assembly with designated holes and inserts simplifies the connection of box girders to columns, addressing inefficiencies and quality control issues in existing methods, resulting in efficient and durable connections.
Patent Information
- Application Number
- CN202422141397.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The construction process of existing prestressed concrete box girders is inefficient, the quality of the steel bar frame is uncontrollable, and the operation is complex when connecting the box girders and columns is high.
Pouring holes are opened on both sides and the bottom of the box beam body, reinforcement bars are inserted on the columns, and connected through concrete filling, combining prestressed formwork and prestressed pipes to improve structural strength and stability.
The construction steps are simplified, the connection strength and operating accuracy are improved, and the durability and stability of the structure are enhanced.
Smart Images
Figure CN223103453U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of box girders, and specifically to a precast prestressed box girder and its tensioning structure. Background Art
[0002] Prestressed concrete box girders have become the main beam type in China's railway or highway bridges due to their excellent strength, stiffness, and cost. Currently, prestressed concrete box girders are usually fabricated in precast beam yards where a large number of workers bind discrete steel bar details into a steel bar skeleton at one time, and then the steel bar skeleton is hoisted as a whole onto the external formwork for operations such as beam body concrete pouring, prestressed tendon threading and tensioning, and curing and forming; in the connection between the box girder and the column, the box girder and the column are usually connected by high-strength bolts or welding.
[0003] The problems existing in the above construction process are: the work efficiency of on-site binding and forming is slow, the quality of the steel bar skeleton is uncontrollable, and prestress cannot be processed; when connecting the box girder and the column, the operation steps are cumbersome and the accuracy of the operation is very high.
[0004] In the process of prestress treatment of existing box girders, the work efficiency is slow, the quality of the steel bar skeleton is uncontrollable, and prestress cannot be processed; when connecting the box girder and the column, the operation steps are cumbersome and the accuracy of the operation is very high. Utility Model Content
[0005] In view of the deficiencies of the prior art, the present application provides a precast prestressed box girder and its tensioning structure, which has the advantages of improving work efficiency, etc., and solves the problems raised in the background art.
[0006] To achieve the above object, the present application provides the following technical solution: A precast prestressed box girder and its tensioning structure, including a box girder body, a group of prestress holes are opened on both the left and right sides of the box girder body, two groups of first pouring holes are opened at the bottom end of the box girder body, a column is provided below the box girder body, a group of second pouring holes are opened at the bottom end of the column, a plurality of third pouring holes are opened on the bottom surface of the box girder body, and steel bars are inserted into the upper surface of the column.
[0007] Through the above solution, opening the first pouring holes can facilitate the pouring of concrete into the box girder, enabling the column to be connected to the box girder body.
[0008] Further, the two groups of first pouring holes are symmetrical.
[0009] Through the above solution, opening the first pouring holes can facilitate the pouring of concrete into the box girder and fill the space inside the box girder.
[0010] Further, the plurality of third pouring holes are adapted to the plurality of steel bars.
[0011] Through the above solution, opening the third pouring hole can facilitate the combination of the steel bars and the box girder, enabling the two to be connected together.
[0012] Furthermore, prestressed formworks are provided on both the left and right sides of the box girder body, and the two prestressed formworks are symmetrical.
[0013] Through the above solution, setting the prestressed formwork can facilitate the reservation of prestressed holes during the fabrication of the box girder, which is convenient for the staff to use.
[0014] Furthermore, a box girder skeleton is provided inside the box girder body.
[0015] Through the above solution, installing the box girder skeleton can improve the rigidity of the box girder, enabling the box girder to withstand greater pressure.
[0016] Furthermore, multiple third pouring holes are all communicated with multiple first pouring holes.
[0017] Through the above solution, the communication between the first pouring hole and the third pouring hole can facilitate the filling of concrete to the position of the steel bars and the third pouring hole through the first pouring hole, enabling the column to be stably connected to the box girder body.
[0018] Furthermore, multiple steel bars are all subjected to rust prevention treatment.
[0019] Through the above solution, the rust prevention treatment of the steel bars can extend the service life of the steel bars, thereby extending the overall service time.
[0020] Furthermore, two groups of prestressed holes are symmetrical, and prestressed pipes are installed inside multiple prestressed holes.
[0021] Through the above solution, installing the prestressed pipes can enhance the bearing capacity of the structure, improving the durability and stability.
[0022] Compared with the prior art, the technical solution of the present application has the following beneficial effects:
[0023] For the prestressed box girder precast member and its tensioning structure, by providing inserted steel bars at one end of the column, first pouring holes are opened on both sides and the bottom of the box girder body, wherein the first pouring holes are communicated with the third pouring holes, and the third pouring holes at the bottom of the box girder body are used for inserting the column. The column is connected to the third pouring holes at the bottom of the box girder body through the inserted steel bars. After the insertion is completed, concrete is poured into the first pouring holes until the first pouring holes are filled with concrete. At this time, the connection between the box girder body and the column is completed. The steps are simple and the connection structure has high strength. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the overall structure of the present application;
[0025] Figure 2 Schematic diagram of the box girder body structure of this application;
[0026] Figure 3 Cross-sectional view of the box girder body structure of this application.
[0027] In the figure:
[0028] 1. Box girder body; 2. Prestressed holes; 3. First casting hole; 4. Column; 5. Second casting hole; 6. Third casting hole; 7. Steel bars; 8. Prestressed formwork; 9. Box girder skeleton; 10. Prestressed pipe. Specific implementation manners
[0029] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.
[0030] Please refer to Figure 1 , Figure 2 and Figure 3 , a prestressed box girder precast member and its tensioning structure in this embodiment include a box girder body 1. A group of prestressed holes 2 are opened on both the left and right sides of the box girder body 1. Two groups of first casting holes 3 are opened at the bottom end of the box girder body 1. A column 4 is provided below the box girder body 1. A group of second casting holes 5 are opened at the bottom end of the column 4. A plurality of third casting holes 6 are opened on the bottom surface of the box girder body 1. Steel bars 7 are inserted into the upper surface of the column 4. One end of the column 4 is provided with inserted steel bars 7. First casting holes 3 are opened on both the sides and the bottom of the box girder body 1. Among them, the first casting holes 3 are communicated with the third casting holes 6. The third casting holes 6 at the bottom of the box girder body 1 are used to insert the column 4 and are connected to the third casting holes 6 at the bottom of the box girder body 1 through the inserted steel bars 7. After the insertion is completed, concrete is poured into the first casting holes 3 until the first casting holes 3 are filled with concrete. At this time, the connection between the box girder body 1 and the column 4 is completed. The steps are simple and the connection structure has high strength.
[0031] Please refer to Figure 1 , Figure 2 and Figure 3, the two groups of first pouring holes 3 are symmetrical. Opening the first pouring holes 3 can facilitate the pouring of concrete into the box girder and fill the space inside the box girder. The multiple third pouring holes 6 are adapted to the multiple steel bars 7. Opening the third pouring holes 6 can facilitate the combination of the steel bars 7 and the box girder, enabling the two to be connected together. Prestressed templates 8 are provided on both the left and right sides of the box girder body 1. The two prestressed templates 8 are symmetrical. Setting the prestressed templates 8 can facilitate the reservation of prestressed holes 2 when manufacturing the box girder, facilitating the use by the staff. A box girder skeleton 9 is provided inside the box girder body 1. Installing the box girder skeleton 9 can improve the rigidity of the box girder, enabling the box girder to withstand greater pressure.
[0032] Please refer to Figure 1 , Figure 2 and Figure 3 , the multiple third pouring holes 6 are all communicated with the multiple first pouring holes 3. The communication between the first pouring holes 3 and the third pouring holes 6 can facilitate the filling of concrete to the positions of the steel bars 7 and the third pouring holes 6 through the first pouring holes 3, enabling the column 4 to be stably connected to the box girder body 1. The multiple steel bars 7 are all treated with rust prevention. Treating the steel bars 7 with rust prevention can extend the service life of the steel bars 7, thereby extending the overall service time. The two groups of prestressed holes 2 are symmetrical, and prestressed pipes 10 are installed inside the multiple prestressed holes 2. Installing the prestressed pipes 10 can enhance the bearing capacity of the structure, improving the durability and stability.
[0033] In a prestressed box girder precast member and its tensioning structure in this embodiment, a plug-in steel bar 7 is provided at one end of the column 4. First pouring holes 3 are opened on both the sides and the bottom of the box girder body 1. Among them, the first pouring holes 3 are communicated with the third pouring holes 6. The third pouring holes 6 at the bottom of the box girder body 1 are used for plugging the column 4. The column 4 is connected to the third pouring holes 6 at the bottom of the box girder body 1 through the plug-in steel bar 7. After the plugging is completed, concrete is poured into the first pouring holes 3 until the first pouring holes 3 are filled with concrete. At this time, the connection between the box girder body 1 and the column 4 is completed. The steps are simple, and the connection structure has high strength.
[0034] The working principle of the above embodiment is as follows: First, the box girder skeleton 9 of the box girder body 1 is arranged in the prestressed pipe 10. The box girder skeleton 9 is placed in a casting mold for pouring. Prestressed templates 8 are placed at both ends of the box girder body 1 to reserve prestressed holes 2 for tensioning the prestressed pipe 10. After the pouring is completed, the prestressed pipe 10 is stretched to the required stress position by a jack. After solidification, the pouring of the box girder body 1 is completed. One end of the column 4 is provided with inserted steel bars 7. First pouring holes 3 are opened on both sides and the bottom of the box girder body 1. Among them, the first pouring hole 3 is communicated with the third pouring hole 6. The third pouring hole 6 at the bottom of the box girder body 1 is used for inserting the column 4 and is connected to the third pouring hole 6 at the bottom of the box girder body 1 through the inserted steel bars 7. After the insertion is completed, concrete is poured into the first pouring hole 3 until the first pouring hole 3 is filled with concrete. At this time, the connection between the box girder body 1 and the column 4 is completed. The steps are simple and the connection structure has high strength.
[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.
[0036] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A precast prestressed box girder and its tensioning structure, including a box girder body (1), characterized in that: A set of prestressed holes (2) are opened on both the left and right sides of the box girder body (1). Two sets of first casting holes (3) are opened at the bottom end of the box girder body (1). A column (4) is provided below the box girder body (1). A set of second casting holes (5) are opened at the bottom end of the column (4). A plurality of third casting holes (6) are opened on the bottom surface of the box girder body (1). Reinforcing bars (7) are inserted into the upper surface of the column (4).
2. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: The two sets of first casting holes (3) are symmetrical to each other.
3. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: The plurality of third casting holes (6) are adapted to the plurality of reinforcing bars (7).
4. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: Prestressed formworks (8) are provided on both the left and right sides of the box girder body (1), and the two prestressed formworks (8) are symmetrical to each other.
5. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: A box girder skeleton (9) is arranged inside the box girder body (1).
6. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: The plurality of third casting holes (6) are all communicated with the two sets of first casting holes (3).
7. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: The plurality of reinforcing bars (7) are all treated against rust.
8. A precast prestressed box girder and its tensioning structure according to claim 1, characterized in that: The two sets of prestressed holes (2) are symmetrical to each other, and prestressed pipes (10) are installed inside the plurality of prestressed holes (2).