Prefabricated box girder structure

Abstract

The utility model discloses a prefabricated box girder structure which comprises a girder top plate and a girder inclined plate, connecting holes are formed in the two ends of the girder inclined plate and the two ends of a girder bottom plate, movable holes are formed below the connecting holes in the two sides of the girder inclined plate, extension blocks are fixedly connected to the two sides of the girder top plate, and mounting holes are formed in the centers of the extension blocks. Mounting screws are arranged in the mounting holes; according to the prefabricated box girder structure, the two box girders are aligned, the extension blocks are attached, the connecting holes are aligned and embedded, the mounting holes are aligned, and mounting screws penetrate through the mounting holes for fixing, so that the two box girders are spliced and connected, and are more stable and not prone to shaking and separation.

Description

Technical Field

[0001] The utility model relates to the technical field of box girders, and particularly relates to a precast box girder structure. Background Technique

[0002] The box girder is a type of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, similar to a box, thus getting its name. It is divided into single-box, multi-box, etc.; it is installed on the bridge pier for load-bearing. The existing ones include a trapezoidal support part and a beam body located above the trapezoidal support part. The width of the beam body is greater than the maximum width of the trapezoidal support part. Therefore, when the external edge of the beam body is under concentrated force, the existing box girder is prone to tipping. For example, in the prior art: CN218786766U, a precast box girder structure, includes a bridge pier, a trapezoidal support part, and a beam body arranged above the trapezoidal support part. On both sides below the beam body, tie rods are equally spaced. The tie rod includes an inclined rod body. The inclined rod bodies on both sides are arranged at intervals and cross each other. The upper end of the inclined rod body is fixedly connected to the edge of the lower surface of the beam body. The lower end of the inclined rod body obliquely passes through the trapezoidal support part and is inserted with a foundation bolt. The foundation bolt is fixedly connected in the bridge pier. The upper end of the inclined rod body is inserted into the lower surface of the beam body, and a limiting head is fixedly connected to the upper end of the inclined rod body. A cross bar is integrally formed at the lower end of the inclined rod body. The foundation bolt includes an inclined bolt body and a limiting insertion rod integrally formed at the upper end of the bolt body.

[0003] There is also the prior art:

[0004] CN216838918U, a precast box girder structure;

[0005] CN218286018U, a precast box girder support structure.

[0006] For the precast box girder structure mentioned in the above prior art, some stabilizing structures are added to prevent the box girder from tipping. In actual use, it is generally composed of multiple box girders combined. The connection and installation between the box girders are not described, which makes the combination of the two less stable and ultimately poses a hidden danger. Content of the Utility Model

[0007] The purpose of the utility model is to provide a precast box girder structure to solve the problems raised in the above background technique.

[0008] To achieve the above purpose, the utility model provides the following technical solution: A precast box girder structure, including a beam top plate, a beam inclined plate, and a beam bottom plate, characterized in that: connection holes are opened at both ends of the beam inclined plate and the beam bottom plate. Activity holes are arranged below the connection holes on both sides of the beam inclined plate. Extension blocks are fixedly connected to both sides of the beam top plate. A base is arranged at the bottom of the extension block. A tie rod is arranged below the base. A fixed seat is arranged at the bottom of the tie rod.

[0009] Preferably, the central area of the box girder formed by the beam top plate, beam inclined plate and beam bottom plate is hollow.

[0010] Preferably, the positions of the extension blocks on the beam top plate are mirror-aligned.

[0011] Preferably, an installation hole is formed in the center of the extension block, and installation screws are arranged inside the installation hole.

[0012] Preferably, a reinforcing rib is arranged in the center of the beam inclined plate.

[0013] Preferably, a drain hole is arranged between the beam inclined plate and the beam bottom plate.

[0014] Preferably, the extension length of the extension block is twice the length by which the beam inclined plate is longer than the beam top plate on one side.

[0015] Preferably, the tie rod is located near the inner side of the base.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. For this precast box girder structure, when two box girders are aligned, the extension blocks are fitted together, the connection holes are aligned and inserted, and the installation holes are aligned with each other and fixed by passing through installation screws. The two box girders can be joined and connected, and are more stable and not prone to shaking and detachment.

[0018] 2. For this precast box girder structure, the fixed seat is welded on the bottom support surface, and the two tie rods cross to support the beam top plate, making the overall assembled box girder more stable and free from the risk of tipping over. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a cross-sectional view of the structure of the present utility model;

[0021] Figure 3 is a schematic diagram of the combined structure of the present utility model;

[0022] Figure 4 is a schematic diagram of the bottom of the structure of the present utility model.

[0023] In the figure: 1. Beam top plate; 2. Beam inclined plate; 3. Reinforcing rib; 4. Movable hole; 5. Connection hole; 6. Tie rod; 7. Fixed seat; 8. Installation hole; 9. Installation screw; 10. Drain hole; 11. Extension block; 12. Beam bottom plate; 13. Base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example: See Figure 1 The utility model provides a technical solution: a prefabricated box beam structure.

[0026] Among them, connecting holes 5 are opened at both ends of the beam inclined plate 2 and the beam bottom plate 12, and movable holes 4 are arranged below the connecting holes 5 on both sides of the beam inclined plate 2. Extension blocks 11 are fixedly connected on both sides of the beam top plate 1, and a base 13 is arranged at the bottom of the extension block 11. A pull rod 6 is arranged below the base 13, and a fixed seat 7 is arranged at the bottom of the pull rod 6.

[0027] In this embodiment, the connecting holes 5 are all long strips, with one side being a hole and the other side being protruding. The two wire interfaces 5 are aligned, and the protruding position can be inserted into the hole for splicing, so that the two box beams can be installed together. The movable hole 4 below leaves a gap for the pull rod 6 to facilitate the adjustment of the pull rod position, and the fixed seat 7 at the bottom of the pull rod 6 is welded to the bottom surface of the box beam. The support of the pull rod 6 makes the box beam as a whole more stable and less likely to tip over.

[0028] The central area of the box girder composed of the beam top plate 1, the beam inclined plate 2 and the beam bottom plate 12 is hollow.

[0029] In this embodiment, the box beam is assembled into an inverted trapezoid. Usually, the beam top plate 1, beam inclined plate 2 and beam bottom plate 12 on the box beam are integrated or welded. The center space saves materials and reduces costs as much as possible while maintaining the load-bearing capacity.

[0030] The position of the extension block 11 on the beam top plate 1 is mirror image aligned.

[0031] In this embodiment, the length of the extension block 11 is half of the beam top plate 1, and the extension blocks 11 on both sides are in different directions of the beam top plate 1. When the two box beams are spliced together, the two connecting holes 5 are inserted and aligned, and the extension blocks 11 at the same height are also aligned.

[0032] A mounting hole 8 is provided at the center of the extension block 11 , and a mounting screw 9 is provided inside the mounting hole 8 .

[0033] In this embodiment, when the extension blocks 11 are aligned, the axes of the mounting holes 8 on the two extension blocks 11 are aligned, and the two box beams can be locked flush by inserting the mounting screws 9 into the mounting holes 8. The connection holes 5 can be used to reduce unilateral vibration, making the assembled box beam more stable.

[0034] Among them, a reinforcing rib 3 is provided at the center of the beam inclined plate 2.

[0035] In this embodiment, the reinforcing rib 3 is located at the most vulnerable center position of the beam inclined plate 2. By thickening, the bearing capacity is increased to prevent fracture at this location.

[0036] Among them, a drain hole 10 is provided between the beam inclined plate 2 and the beam bottom plate 12.

[0037] In this embodiment, the drain holes 10 are on both sides of the reinforcing rib 3, at the junction of the bottom of the beam inclined plate 2 and the beam bottom plate 12, extending to both sides and finally reaching the edge of the beam inclined plate 2 and forming a semicircle downward. When two box girders are joined, the two downward semicircular drain holes 10 on both sides are joined to form a circle. When external rainwater seeps in through the joining gap, it is collected into the drain holes 10 by gravity and finally flows out of the box girder downward, avoiding corrosion caused by long-term water storage inside the box girder.

[0038] Among them, the extended length of the extension block 11 is twice the length by which the beam inclined plate 2 is longer than the beam top plate 1 on one side.

[0039] In this embodiment, the outermost side of the extension block 11 is attached to the beam top plate 1 of another box girder. The two inclined plates 2 on both sides must be half the length by which the extension block 11 extends, so that the connection holes 5 can be fitted. If the distance is not enough, a bulge cannot be inserted into the groove hole and thus cannot play a fixing role. If the distance exceeds, the mounting holes 8 on the extension block 11 cannot be aligned, and the mounting screws 9 cannot be installed.

[0040] Among them, the tie rod 6 is located at a position close to the inner side of the base 13.

[0041] In this embodiment, the two tie rods 6 on the left and right need to be staggered from each other to avoid collision, so the tie rod 6 cannot be at the center position of the base 13.

[0042] Working principle: Align the two box girders, attach the extension blocks 11, align the mounting holes 8 on the extension blocks 11 with each other, and insert and fix the mounting screws 9. The protruding positions on the connection holes 5 can be inserted into the connection holes 5 on the other side for splicing. The docking of multiple connection holes 5 makes the splicing connection of the box girder more stable, reduces the occurrence of vibration during use, and is firm and not easy to shake and break away. The tie rod 6 adjusts the angle through the base 13 so that the fixing seat 7 at the bottom is welded to the bottom surface where the box girder is placed. Through the cooperation and support of the two tie rods 6, the overall box girder is more stable and not easy to tip over.

[0043] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] Although the embodiments of the present utility model 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 utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A precast box girder structure, comprising a beam top plate (1), a beam inclined plate (2) and a beam bottom plate (12), characterized in that: Both ends of the beam inclined plate (2) and the beam bottom plate (12) are provided with connecting holes (5). Below the two connecting holes (5) on both sides of the beam inclined plate (2), there are movable holes (4). On both sides of the beam top plate (1), there are fixed extension blocks (11). At the bottom of the extension block (11), there is a base (13). Below the base (13), there is a pull rod (6). At the bottom of the pull rod (6), there is a fixed seat (7).

2. The precast box girder structure according to claim 1, characterized in that: The central area of the box girder composed of the beam top plate (1), the beam inclined plate (2) and the beam bottom plate (12) is hollow.

3. A precast box girder structure according to claim 1, characterized in that: The positions of the extension blocks (11) on the beam top plate (1) are mirror-aligned.

4. A precast box girder structure according to claim 1, characterized in that: An installation hole (8) is provided at the center of the extension block (11), and an installation screw (9) is arranged inside the installation hole (8).

5. A precast box girder structure according to claim 1, characterized in that: A reinforcing rib (3) is arranged at the center of the beam inclined plate (2).

6. A precast box girder structure according to claim 1, characterized in that: A drain hole (10) is arranged between the beam inclined plate (2) and the beam bottom plate (12).

7. A precast box girder structure according to claim 1, characterized in that: The extension length of the extension block (11) is twice the length by which the beam inclined plate (2) is longer than the beam top plate (1) on one side.

8. A precast box girder structure according to claim 1, characterized in that: The pull rod (6) is located at a position close to the inner side of the base (13).

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