A prefabricated assembly type concrete box girder connecting structure

Abstract

The utility model provides a prefabricated assembly type concrete box girder connecting structure for connecting first box girder and second box girder, and the butt joint end portion between first box girder and second box girder forms wet joint, and the connecting structure comprises: a pair of prefabricated slots respectively arranged at the butt joint end portion of first box girder and second box girder, two prefabricated slots are oppositely arranged and form pouring space with part wet joint, and the groove bottom of prefabricated slot is provided with a clamping groove, connecting reinforcement is located in pouring space, and the both ends of connecting reinforcement are provided with inserts, and the inserts are inserted into clamping grooves respectively, wherein the groove bottom of prefabricated slot is the face of prefabricated slot in the first direction, wherein the first direction is the direction from top to bottom of box girder, and the connecting structure in the application improves the connecting speed of box girder and effectively shortens the construction period.

Description

Technical Field

[0001] This application relates to the field of concrete box girder technology, and in particular to a precast assembled concrete box girder connection structure. Background Technology

[0002] In bridge engineering and prefabricated building construction, box girders, as crucial load-bearing components, directly impact the overall integrity and stability of the structure through their connection quality. Currently, the connection of two box girders commonly employs a wet-joint concrete connection process, where concrete is poured to fill the joint, forming a unified structure between adjacent box girders. During this process, to ensure the structural mechanical properties, the reinforcing bars of the two box girders must be reliably connected. Traditional rebar connection methods typically include welding, mechanical splicing, or tying, all of which require complex on-site operations, reducing the efficiency of box girder connections. Utility Model Content

[0003] In view of this, the purpose of this application is to propose a precast assembled concrete box girder connection structure to solve the problem of low connection efficiency caused by the complexity of existing box girder connections.

[0004] To achieve the above objectives, this application provides a precast assembled concrete box girder connection structure for connecting a first box girder and a second box girder, wherein a wet joint is formed between the butt joint ends of the first box girder and the second box girder, characterized in that it comprises:

[0005] A pair of precast troughs are respectively located at the joint ends of the first box girder and the second box girder. The two precast troughs are arranged opposite each other and together with part of the wet joint to form a casting space. The bottom of each precast trough is provided with a slot.

[0006] The connecting steel bar is located within the casting space and has inserts at both ends, which are respectively inserted into the slots.

[0007] Optionally, the slot is formed by a recess in the bottom of the precast groove in the first direction, where the first direction is the height direction of the box girder.

[0008] Optionally, multiple precast grooves are provided on the first box girder and the second box girder in the first direction, forming multiple layers of the casting space with the wet joint. Each layer of the casting space is provided with at least one connecting steel bar, and the plugs at both ends of each connecting steel bar are respectively inserted into the slots of the corresponding casting space.

[0009] Optionally, the cross-section of the multiple layers of casting spaces in the first direction is stepped, and the cross-sectional area of ​​each layer of casting space decreases along the first direction.

[0010] Optionally, the plug-in has a flat rectangular structure, and the connecting steel bar is connected to the center of the plug-in.

[0011] Optionally, the walls of the precast trough are provided with anti-slip textures.

[0012] Optionally, the surface of the connecting steel bar is provided with threads.

[0013] Optionally, the precast groove extends longitudinally through the joint ends of the first box girder and the second box girder, and multiple connecting steel bars are evenly arranged longitudinally along the box girder.

[0014] Optionally, the first box girder and the second box girder are provided with multiple reinforcing ribs.

[0015] Optionally, a strain monitoring sensor is installed in the pouring space.

[0016] As described above, the precast assembled concrete box girder connection structure provided in this application includes a precast groove and connecting reinforcing bars. The bottom of the precast groove has a slot. The precast groove and slot are pre-set. At the construction site, the precast first and second box girders are positioned so that the precast grooves and slots are aligned, forming a pouring space between the precast groove and the wet joint. Then, the inserts at both ends of the connecting reinforcing bars are inserted into the corresponding slots. The first box girder is connected to the second box girder via the connecting reinforcing bars, and concrete is poured into the pouring space. After the concrete hardens, the assembly of the first and second box girders is completed. This connection method greatly simplifies the on-site box girder assembly process. Traditional connections require extensive on-site reinforcement processing, binding, and formwork construction. This solution only requires inserting the inserts of the connecting reinforcing bars into the corresponding slots of adjacent box girders and then pouring concrete into the pouring space, quickly completing the connection between box girders. This significantly improves the box girder connection speed and effectively shortens the construction cycle. Furthermore, the slots provide accurate installation positions for the connecting reinforcing bars before concrete pouring, facilitating the arrangement and fixing of the bars by construction personnel and reducing construction errors. The slots are positioned along the first direction (the height direction of the box girder). After the insert is inserted, when the first and second box girders sway relative to each other due to external factors such as vehicle loads, wind, and temperature changes, the slots effectively restrain the insert, allowing the connecting reinforcing bars to fully exert their tensile strength. This effectively enhances the stability of the connection between the first and second box girders, ensuring the safety and reliability of the bridge structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This application provides a schematic diagram showing the connection between the first box girder and the second box girder in an embodiment.

[0019] Figure 2 This is an enlarged view of structure A in the embodiment of this application.

[0020] Attached reference numerals: 01, First box girder; 02, Second box girder; 03, Wet joint; 1, Precast groove; 11, Casting space; 12, Slot; 2, Connecting reinforcement; 21, Insert; 3, Reinforcing bar. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] As mentioned in the background, in the fields of bridge engineering and prefabricated construction, box girders, as core load-bearing components, directly affect the stability and durability of the overall structure, and are a key factor determining the safety and service life of the project. Currently, the connection of two box girders generally adopts the wet-joint concrete connection process, that is, filling the joint with poured concrete to make the adjacent box girders form a whole. In this process, in order to ensure the mechanical performance of the structure, the steel bars of the two box girders must be reliably connected.

[0024] Traditional rebar connection methods typically include welding, mechanical connection, or tying. These traditional methods all require numerous complex operations on-site, extending the construction period, increasing labor costs, and hindering standardized, large-scale construction due to the complex and variable on-site environment. This severely restricts the efficiency and quality of box girder connections, contradicting the development concepts of rapid construction and environmentally friendly prefabricated buildings. With the continuous expansion of my country's infrastructure construction and the booming development of the prefabricated building industry, higher demands are placed on the efficiency, reliability, and economy of box girder connection technology. There is an urgent need to develop new connection structures and processes to solve the many problems associated with traditional connection methods.

[0025] The following is in conjunction with the appendix Figure 1-2 The embodiments of this application will be described in detail below.

[0026] like Figure 1 and Figure 2 As shown, a precast assembled concrete box girder connection structure is used to connect a first box girder 01 and a second box girder 02. A wet joint 03 is formed between the butt joint ends of the first box girder 01 and the second box girder 02. The connection structure includes:

[0027] A pair of precast troughs 1 are respectively provided at the joint ends of the first box girder 01 and the second box girder 02. The two precast troughs 1 are arranged opposite to each other and together with part of the wet joint 03 to form a casting space 11. The bottom of each precast trough 1 is provided with a slot 12.

[0028] The connecting steel bar 2 is located in the pouring space 11, and has plugs 21 at both ends, which are respectively inserted into the slots 12.

[0029] In addition, the slot 12 is formed by the bottom of the precast slot 1 recessed along a first direction, which is the height direction of the box girder.

[0030] Specifically, the first box girder 01 and the second box girder 02 are arranged adjacent to each other. The butt joint ends of the first box girder 01 and the second box girder 02 refer to the ends of the box girders used for splicing. When the first box girder 01 and the second box girder 02 are spliced, a reserved gap, namely a wet joint 03, will be formed between the butt joint ends. The wet joint 03 is used for pouring concrete to connect the two independent box girders into a whole. The width of the wet joint 03 is generally determined according to the design requirements, usually within a certain range, such as tens of centimeters to about one meter. Its width needs to ensure that the connecting steel bars 2 can be reasonably arranged, while meeting the construction requirements of concrete pouring and vibration, so as to ensure the connection quality.

[0031] Precast grooves 1 are respectively provided at the joint ends of the first box girder 01 and the second box girder 02. The precast grooves 1 are formed by recessing from the top to the bottom of the box girder and opening towards the side near the adjacent box girder so as to communicate with the wet joint 03 to form a casting space 11. The casting space 11 is in the first direction ( Figure 2 The vertical section in the X direction is U-shaped. This structural design facilitates the installation and arrangement of the connecting steel bars 2 and the concrete pouring, thus ensuring the smooth progress of the connection structure construction.

[0032] The bottom of the precast trough 1 is the surface of the precast trough 1 in the first direction, which is the height direction of the box girder. Specifically, the bottom of the precast trough 1 is the bottom of the partially cast-in-place space 11. The bottom of the precast trough 1 has a pre-drilled slot 12 to facilitate the insertion of the inserts 21 at both ends of the connecting steel bars 2 during on-site assembly of the box girder. This facilitates the on-site connection of the first box girder 01 and the second box girder 02 via the connecting steel bars 2. The slot 12 is located in the first direction, and the inserts 21 are inserted into the slot 12. When the first box girder 01 and the second box girder 02 experience relative swaying due to external factors (such as vibration caused by vehicle movement, expansion and contraction due to temperature changes, etc.), the slot 12 restricts the inserts 21, allowing the connecting steel bars 2 to utilize their tensile strength to enhance the stability of the first box girder 01 and the second box girder 02. The connecting steel bars 2 are positioned along the second direction (… Figure 2 The first box girder 01 and the second box girder 02 are connected in the Y direction, with the second direction being perpendicular to the first direction. This design fully utilizes the tensile strength of the connecting steel bars 2 and further enhances the connection stability of the first box girder 01 and the second box girder 02. The slot 12 is recessed along the first direction, facilitating manual slotting and saving slotting efficiency.

[0033] In this embodiment, the precast groove 1 and the slot 12 are pre-set. At the construction site, the precast first box girder 01 and the second box girder 02 are first positioned so that the precast groove 1 and the slot 12 are positioned opposite each other, so that the precast groove 1 and the wet joint 03 form a pouring space 11. Then, the plugs 21 at both ends of the connecting steel bar 2 are inserted into the slots 12. The first box girder 01 is connected to the second box girder 02 through the connecting steel bar 2, and concrete is poured into the pouring space 11. After the concrete hardens, the assembly of the first box girder 01 and the second box girder 02 is completed. This connection method greatly simplifies the on-site box girder assembly process. Traditional connections require a lot of steel bar processing, binding and formwork construction on-site. However, this solution only requires inserting the plugs 21 of the connecting steel bar 2 into the corresponding slots 12 of the adjacent box girder and then pouring concrete into the pouring space 11 to quickly complete the connection between the box girders, which significantly improves the box girder connection speed and effectively shortens the construction cycle. Furthermore, the slot 12 provides an accurate installation position for the connecting steel bars 2 before concrete pouring, facilitating the arrangement and fixing of the connecting steel bars 2 by construction personnel and reducing construction errors. The slot 12 is set along the first direction (the height direction of the box girder). After the insert 21 is inserted into the slot 12, when the first box girder 01 and the second box girder 02 experience relative swaying due to external factors such as vehicle load, wind force, and temperature changes, the slot 12 effectively restricts the insert 21, allowing the connecting steel bars 2 to fully utilize their tensile strength. This effectively enhances the stability of the connection between the first box girder 01 and the second box girder 02, ensuring the safety and reliability of the bridge structure.

[0034] In some embodiments, such as Figure 1 and Figure 2 The precast grooves 1 on the first box girder 01 and the second box girder 02 are provided in multiple ways in the first direction, and form multiple layers of casting spaces 11 with the wet joint 03. Each layer of casting space 11 is provided with at least one connecting steel bar 2, and the plugs 21 at both ends of each connecting steel bar 2 are respectively inserted into the slots 12 of the corresponding casting space 11.

[0035] In addition, the cross-section of the multi-layered casting space 11 (11) in the first direction is stepped, and the cross-sectional area of ​​each layer of the casting space 11 decreases along the first direction.

[0036] Specifically, the multi-layered casting spaces 11 are interconnected, and the cross-section of each casting space 11 in the first direction is U-shaped. The cross-section of each multi-layered casting space 11 in the height direction of the box girder is stepped, and the cross-sectional area of ​​each layer of the casting space 11 decreases along the first direction, which facilitates the placement of the connecting steel bars 2 at the bottom of each layer of the casting space 11, while leaving space for the slot 12 to be opened on the bottom wall of each layer of the casting space 11.

[0037] In this embodiment, the arrangement of multiple layers of connecting steel bars 2 and the casting space 11 enables the box girder to more effectively distribute and transfer loads. When the bridge is subjected to external forces such as vehicle loads and wind loads, each layer of connecting steel bars 2 bears different tensile and shear forces according to its own position and stress characteristics, avoiding the local stress concentration problem that may occur in a single-layer connection structure.

[0038] In some embodiments, the plug-in 21 is a flat rectangular structure, and the connecting steel bar 2 is connected to the center of the plug-in 21.

[0039] Specifically, textures are added to the surface of the flat rectangular insert 21. The textures can be designed as an interlaced grid, which effectively increases the friction between the insert 21 and the box girder and concrete, and further enhances the stability of the box girder connection after the concrete is poured.

[0040] In this embodiment, the flat rectangular insert 21 has a large contact area with the box girder. After concrete pouring, it can form a tight integral with the box girder and concrete, allowing the connecting steel bar 2 to enhance the stability of the first box girder 01 and the second box girder 02 by utilizing its tensile strength. The connecting steel bar 2 is located at the center of the insert 21, which can evenly distribute the load from all directions, avoiding local stress concentration caused by uneven force distribution, thereby effectively improving the overall stability of the structure.

[0041] In some embodiments, the precast groove 1 extends longitudinally through the joint ends of the first box girder 01 and the second box girder 02, and multiple connecting steel bars 2 are evenly arranged longitudinally along the box girder.

[0042] In addition, the wall of the precast groove 1 is provided with anti-slip texture. The surface of the connecting steel bar 2 is provided with threads.

[0043] Specifically, the longitudinal direction of the box girder is its length. The precast groove 1 extends along the length of the box girder through its joint ends, forming a continuous longitudinal channel to create a continuous casting space 11. Multiple connecting steel bars 2 are evenly arranged along the longitudinal direction of the box girder, with spacing determined based on structural stress analysis to ensure uniform load transfer. The thread design of the steel bars conforms to relevant standards, including thread pitch and tooth angle, significantly increasing the bond between the steel bars and concrete. After the concrete solidifies, the threads interlock with the concrete, allowing the steel bars and concrete to work together, effectively improving the tensile and shear strength of the connection structure. Before pouring concrete, the surface of the precast groove 1 is pretreated, such as by roughening and applying an interface agent. Roughening increases the surface roughness of the precast groove 1, while the interface agent improves the bond between the precast groove 1 and the concrete, allowing for better bonding and improved connection quality.

[0044] In some embodiments, the first box girder 01 and the second box girder 02 are provided with multiple reinforcing ribs 3.

[0045] Specifically, the stiffeners 3 are arranged along the transverse and longitudinal directions of the box girder to form a three-dimensional grid structure, which facilitates the uniform distribution of the load on the box girder in multiple directions, thereby effectively enhancing the overall stiffness and stability of the box girder.

[0046] In some embodiments, a strain monitoring sensor is provided in the pouring space 11.

[0047] Specifically, strain monitoring sensors can be microelectromechanical system (MEMS) strain sensors. These sensors are small in size, lightweight, and have low power consumption, making them easy to install. They also have high sensitivity and response speed, enabling them to quickly capture strain changes in the box girder connection structure.

[0048] In this embodiment, strain monitoring sensors are embedded within the casting space 11 to enable real-time dynamic monitoring of the box girder connection structure. During the use of bridges, buildings, and other structures, in the event of abnormal conditions such as overload, foundation settlement, or natural disasters, the strain monitoring sensors can quickly detect changes in structural strain and transmit the data to the monitoring system. When the strain data exceeds a pre-set safety threshold, the system will immediately issue an early warning signal, reminding relevant personnel to take emergency measures, such as restricting access and evacuating personnel, effectively preventing safety accidents and thus protecting people's lives and property.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0050] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of the implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be entirely within the understanding of those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0051] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures may use the embodiments discussed.

[0052] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the claims of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A precast assembled concrete box girder connection structure for connecting a first box girder (01) and a second box girder (02), wherein a wet joint (03) is formed between the butt joint ends of the first box girder (01) and the second box girder (02), characterized in that, include: A pair of precast troughs (1) are respectively located at the joint ends of the first box girder (01) and the second box girder (02). The two precast troughs (1) are arranged opposite to each other and together with part of the wet joint (03) form a casting space (11). The bottom of each precast trough (1) is provided with a slot (12). The connecting steel bar (2) is located in the pouring space (11) and has plugs (21) at both ends. The plugs (21) are respectively inserted into the slots (12).

2. The precast assembled concrete box girder connection structure according to claim 1, characterized in that, The slot (12) is formed by the bottom of the precast groove (1) recessed along the first direction, which is the height direction of the box girder.

3. The precast assembled concrete box girder connection structure according to claim 2, characterized in that, The precast grooves (1) on the first box girder (01) and the second box girder (02) are provided in multiple ways in the first direction, and form multiple layers of the casting space (11) with the wet joint (03). Each layer of the casting space (11) is provided with at least one connecting steel bar (2), and the plugs (21) at both ends of each connecting steel bar (2) are respectively inserted into the slots (12) of the corresponding casting space (11).

4. The precast assembled concrete box girder connection structure according to claim 3, characterized in that, The multi-layered casting space (11) has a stepped cross-section in the first direction, and the cross-sectional area of ​​each layer of the casting space (11) decreases along the first direction.

5. The precast assembled concrete box girder connection structure according to claim 1, characterized in that, The plug (21) has a flat rectangular structure, and the connecting steel bar (2) is connected to the center of the plug (21).

6. The precast assembled concrete box girder connection structure according to claim 1, characterized in that, The prefabricated trough (1) has anti-slip textures on its walls.

7. The precast assembled concrete box girder connection structure according to claim 1, characterized in that, The surface of the connecting steel bar (2) is threaded.

8. The precast assembled concrete box girder connection structure according to claim 1, characterized in that, The precast groove (1) runs longitudinally through the joint ends of the first box girder (01) and the second box girder (02), and the connecting steel bars (2) are evenly arranged in multiple lengths along the longitudinal direction of the box girder.

9. A precast assembled concrete box girder connection structure according to claim 1, characterized in that, The first box girder (01) and the second box girder (02) are provided with multiple reinforcing ribs (3).

10. A precast assembled concrete box girder connection structure according to claim 1, characterized in that, Strain monitoring sensors are installed in the pouring space (11).

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