Temporary locking structure for open-web type continuous rigid framework

Abstract

The open-web type continuous rigid frame temporary locking structure comprises a plurality of pieces of square steel, eight sets of steel channels are welded to the upper surface and the lower surface of each piece of square steel, and the four sets of square steel are fixedly connected with an upper chord web and a lower chord lower portion through the steel channels correspondingly; the square steel is in threaded connection with a plurality of sets of bolts, the bolts are in threaded connection with angle steel attached to the square steel, the two sets of square steel are fixedly connected with an upper chord lower portion and a lower chord upper portion through channel steel respectively, the upper chord web is fixedly connected with the upper chord lower portion, and the lower chord upper portion is fixedly connected with the lower chord lower portion. The invention relates to the technical field of bridge structures. According to the open-web type continuous rigid frame temporary locking structure, the square steel is embedded and welded through the channel steel, the open-web type continuous rigid frame temporary locking structure is prevented from being pulled off due to construction and temperature changes, the construction quality and safety are guaranteed, the stress path is clear, compared with a strong locking device, the performance of all rod pieces can be fully utilized, and the structural stability of the locking device is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of bridge structure technology, specifically to a hollow continuous rigid frame temporary locking structure. Background Technology

[0002] Hollow-web continuous rigid frame bridges are widely used due to their excellent planar alignment and structural stress performance, giving large-span concrete hollow-web continuous rigid frame bridges a significant competitive advantage. However, when the span exceeds 200m, the economic efficiency of the project decreases sharply; the structural bearing capacity is low, making it prone to cracking and deflection, increasing technical risks, and resulting in poor structural safety and durability; the heavy weight of the superstructure leads to greater stress on the piers and foundations, resulting in poor seismic performance. With the development of infrastructure in my country, the span capacity requirements for bridges have become more stringent, leading to the development of steel-concrete composite hollow-web continuous rigid frame bridges. These bridges fully utilize the performance of steel and concrete, reducing the overall structural weight. Due to the inherent characteristics of the bridge, the design of the triangular closure section has strict requirements, necessitating temporary locking of the triangular area in advance to prevent cracking of the closure section due to inconsistent deformation of the upper and lower chords during construction. Currently, there are few temporary locking structures in the triangular area. To prevent cracking of the cast-in-place closure section concrete, most adopt strong locking structures. However, this can cause excessive stress on the locking structure and complex stress patterns. Furthermore, the removal of the temporary locking structure later can affect the overall stress, posing certain safety hazards. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a hollow continuous rigid frame temporary locking structure. This temporary locking device has a clear force distribution, low cost, convenient construction, factory-produced and standardized structural components, short construction time, and does not require subsequent dismantling, thus meeting the needs of normal use and durability of the structure.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a hollow continuous rigid frame temporary locking structure, comprising several square steels, wherein eight sets of channel steels are welded to the upper and lower surfaces of each square steel, and four sets of square steels are respectively fixedly connected to the upper chord web and the lower part of the lower chord through the channel steels.

[0005] The square steel bars are threaded with a number of bolts, and the bolts are threaded with angle steel that fits against the square steel bars. The two sets of square steel bars are fixedly connected to the lower part of the upper chord and the upper part of the lower chord by channel steel. The web of the upper chord is fixedly connected to the lower part of the upper chord, and the upper part of the lower chord is fixedly connected to the lower part of the lower chord. The four sets of square steel bars are fixedly connected to two sets of steel plates away from the web of the upper chord and the lower part of the lower chord.

[0006] Preferably, the square steel and angle steel are bolted together to form a structural whole, the square steel and angle steel are connected to form an X-shaped scissor brace, and the square steel and channel steel are pre-embedded in the concrete in the lower part of the upper chord and the upper part of the lower chord.

[0007] Preferably, the lower part of the upper chord and the upper part of the lower chord are connected by square steel and angle steel to form a primary locking structure, and the web of the upper chord and the lower part of the lower chord are connected by square steel to form a secondary locking structure.

[0008] Preferably, the primary locking structure is reinforced with angle steel to enhance vertical constraint, and the secondary locking structure is reinforced with X-shaped scissor braces to enhance lateral constraint. The primary and secondary locking structures are respectively connected laterally by angle steel.

[0009] Preferably, the main locking structure consists of five frames, the square steel and the channel steel are rigidly connected, and the main locking device consists of eight connecting beams.

[0010] Preferably, four connecting beams are provided on the lower part of the upper chord and the upper part of the lower chord, and the connecting beams are fixedly connected by steel plates, angle steel and bolts.

[0011] Preferably, the secondary locking structure consists of two frames, which are respectively fixedly connected to the upper chord web and the lower part of the lower chord. Each frame of the secondary locking structure is fixedly connected by an X-shaped angle steel. The two frames of the secondary locking structure are respectively connected by angle steel and fixedly connected to a steel plate, angle steel, and bolts.

[0012] Preferably, the secondary locking structure is connected by X-shaped angle steel to form a scissor brace, and the two secondary locking structures are respectively connected by angle steel to form a lateral constraint.

[0013] Beneficial effects

[0014] This invention provides a hollow continuous rigid frame temporary locking structure. Compared with the prior art, it has the following advantages:

[0015] (1) The hollow continuous rigid frame temporary locking structure is pre-embedded with square steel and welded with channel steel to prevent it from being pulled out due to construction and temperature changes, thus ensuring construction quality and safety. The force path is clear. Compared with the strong locking device, it can make full use of the performance of each member and ensure the stability of the locking device structure.

[0016] (2) The hollow continuous rigid frame temporary locking structure, by setting X-shaped angle steel scissor bracing in the device, not only improves the longitudinal stiffness of the locking structure, but also strengthens the overall stability of the structure. Through the connection of steel plates, angle steel and bolts, a semi-rigid connection is provided to ensure sufficient stiffness and a certain deformation of the structure.

[0017] (3) The hollow continuous rigid frame temporary locking structure ensures that the locking structure has a certain reserve force by setting primary and secondary locking devices in the device, and can ensure that the structure will not be damaged under special stress conditions. The transverse connection ensures the transverse stiffness of the structure and will not cause the locking structure to become unstable and damaged due to wind load and earthquake load. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a front view of the present invention;

[0020] Figure 3 This is a side view of the present invention;

[0021] Figure 4 These are detailed drawings of square steel, steel plates, and welding diagrams of square steel and channel steel for this invention.

[0022] In the diagram: 1. Square steel; 2. Channel steel; 3. Angle steel; 4. Steel plate; 5. Bolt; 6. Upper part of the lower chord; 7. Lower part of the lower chord; 8. Web of the upper chord; 9. Lower part of the upper chord. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] refer to Figure 1-4 The present invention provides the following three technical solutions:

[0025] The first implementation method: A hollow continuous rigid frame temporary locking structure includes several square steels 1, eight sets of channel steels 2 are welded to the upper and lower surfaces of the square steels 1 respectively, and four sets of square steels 1 are fixedly connected to the upper chord web plate 8 and the lower chord 7 respectively through the channel steels 2; the square steels 1 are threadedly connected to a number of bolts 5, and the bolts 5 are threadedly connected to angle steels 3 that fit with the square steels 1; two sets of square steels 1 are fixedly connected to the lower chord 9 and the upper chord 6 respectively through the channel steels 2, the upper chord web plate 8 is fixedly connected to the lower chord 9, the upper chord 6 is fixedly connected to the lower chord 7, and two sets of steel plates 4 are fixedly connected to the four sets of square steels 1 away from the upper chord web plate 8 and the lower chord 7 respectively;

[0026] Square steel 1 and angle steel 3 are connected by bolts 5 to form a structural whole. Square steel 1 and angle steel 3 are connected to form an X-shaped scissor brace. Square steel 1 and channel steel 2 are pre-embedded in the concrete in the lower part 9 of the upper chord and the upper part 6 of the lower chord. By pre-embedding square steel 1 and welding it with channel steel 2, it is prevented from being pulled out due to construction and temperature changes, thus ensuring construction quality and safety. Compared with strong locking devices, it can make full use of the performance of each member.

[0027] The main difference between the second implementation method and the first implementation method is that:

[0028] The lower part 9 of the upper chord and the upper part 6 of the lower chord form the main locking structure through square steel 1 and angle steel 3. The web plate 8 of the upper chord and the lower part 7 of the lower chord are connected through square steel 1 to form the secondary locking structure. The main locking structure is reinforced with vertical constraint through angle steel 3, and the secondary locking structure is reinforced with horizontal constraint through X-shaped scissor braces. The main locking structure and the secondary locking structure are respectively fixedly connected laterally through angle steel 3.

[0029] The main locking structure consists of five frames, with square steel 1 and channel steel 2 rigidly connected. The main locking device has eight connecting beams. The lower part of the upper chord 9 and the upper part of the lower chord 6 each have four connecting beams, which are fixedly connected by steel plates 4, angle steel 3, and bolts 5. By setting scissor braces composed of X-shaped angle steel 3 in the device, not only is the longitudinal stiffness of the locking structure improved, but the overall stability of the structure is also enhanced. The connection of steel plates 4, angle steel 3, and bolts 5 provides a semi-rigid connection.

[0030] The main difference between the third and second implementation methods is that:

[0031] Two secondary locking structures are provided and are fixedly connected to the upper chord web plate 8 and the lower part of the lower chord 7 respectively. Each secondary locking structure is fixedly connected by X-shaped angle steel 3. The two secondary locking structures are connected by angle steel 3 and fixedly connected to steel plate 4, angle steel 3, and bolt 5 respectively.

[0032] The secondary locking structure is connected by X-shaped angle steel 3 to form a scissor brace. The two secondary locking structures are connected by angle steel 3 to form a lateral constraint. By setting primary and secondary locking devices in the device, the locking structure is guaranteed to have a certain spare capacity, and the structure can be guaranteed not to be damaged under special stress conditions. The lateral connection is set to ensure the lateral stiffness of the structure and prevent the locking structure from becoming unstable and damaged due to wind load and seismic load.

[0033] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0034] In use, the user processes the components according to the drawings at the steel mill, prefabricating square steel 1, channel steel 2, angle steel 3, and steel plate 4. Angle steel 3 and steel plate 4 must meet precision requirements for drilling. After each component is processed, steel plate 4 is pre-welded to square steel 1, and channel steel 2 is pre-welded to square steel 1 at the factory. The welding positions strictly adhere to the drawing requirements. After confirmation, the components are loaded and transported to the bridge site. When the upper and lower chords of the triangular area are poured at the bridge site, the prefabricated square steel is pre-embedded at fixed points to precisely locate its spatial position, and then the upper and lower chord concrete is poured. When the lower chord concrete reaches its set strength and the outdoor temperature meets the requirements for temporary closure, the main locking device, angle steel 3, is hoisted and connected to square steel 1 using a crane. The connection is made using steel plate 4, angle steel 3, and bolts 5. After the main locking device is installed, the secondary components can be installed. Angle steel 3 is used to connect the upper chord web plate 8 and the lower part of the lower chord 7 to form an X-shaped scissor brace, which is then connected using steel plate 4, angle steel 3, and bolts 5. Finally, the lateral connection is made by connecting angle steel 3 and square steel 1 to form a lateral constraint, which is also made using steel plate 4, angle steel 3, and bolts 5.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hollow continuous rigid frame temporary locking structure, comprising a plurality of square steel bars (1), characterized in that: The square steel (1) has eight sets of channel steel (2) welded to its upper and lower surfaces respectively. The four sets of square steel (1) are fixedly connected to the upper chord web plate (8) and the lower chord (7) respectively through the channel steel (2). The square steel (1) is threaded with a number of bolts (5), and the bolts (5) are threaded with angle steel (3) that fits against the square steel (1). The two sets of square steel (1) are fixedly connected to the lower part of the upper chord (9) and the upper part of the lower chord (6) respectively through channel steel (2). The upper chord web (8) is fixedly connected to the lower part of the upper chord (9), and the upper part of the lower chord (6) is fixedly connected to the lower part of the lower chord (7). The four sets of square steel (1) are fixedly connected to two sets of steel plates (4) away from the upper chord web (8) and the lower part of the lower chord (7).

2. The hollow continuous rigid frame temporary locking structure according to claim 1, characterized in that: The square steel (1) and angle steel (3) are connected by bolts (5) to form a structural whole. The square steel (1) and angle steel (3) are connected to form an X-shaped scissor brace. The square steel (1) and channel steel (2) are embedded in the concrete in the lower part (9) of the upper chord and the upper part (6) of the lower chord.

3. The hollow continuous rigid frame temporary locking structure according to claim 1, characterized in that: The lower part (9) of the upper chord and the upper part (6) of the lower chord are connected by square steel (1) and angle steel (3) to form the main locking structure, and the web plate (8) of the upper chord and the lower part (7) of the lower chord are connected by square steel (1) to form the secondary locking structure.

4. A temporary locking structure for a hollow continuous rigid frame according to claim 3, characterized in that: The main locking structure is reinforced with vertical constraints by angle steel (3), and the secondary locking structure is reinforced with horizontal constraints by X-shaped scissor braces. The main locking structure and the secondary locking structure are respectively fixedly connected laterally by angle steel (3).

5. A temporary locking structure for a hollow continuous rigid frame according to claim 3, characterized in that: The main locking structure is provided with five frames, the square steel (1) and the channel steel (2) are rigidly connected, and the main locking device is provided with eight connecting beams.

6. A temporary locking structure for a hollow continuous rigid frame according to claim 5, characterized in that: The lower part (9) of the upper chord and the upper part (6) of the lower chord are each provided with four connecting beams, which are fixedly connected by steel plates (4), angle steel (3) and bolts (5).

7. A temporary locking structure for a hollow continuous rigid frame according to claim 3, characterized in that: The secondary locking structure consists of two frames, which are fixedly connected to the upper chord web (8) and the lower chord (7) respectively. Each frame of the secondary locking structure is fixedly connected by an X-shaped angle steel (3). The two frames of the secondary locking structure are connected by angle steel (3) and fixedly connected to the steel plate (4), angle steel (3), and bolt (5) respectively.

8. A temporary locking structure for a hollow continuous rigid frame according to claim 7, characterized in that: The secondary locking structure is connected by X-shaped angle steel (3) to form a scissor brace. The two secondary locking structures are connected by angle steel (3) to form a lateral constraint.

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