Pedestal device for on-site assembly of UHPC (Ultra High Performance Concrete) beam

Abstract

The utility model discloses a UHPC beam on-site assembly pedestal device, which comprises embedded steel bars, channel steel and a steel template, one end of each embedded steel bar is inserted into the ground and is vertically and fixedly connected with the ground, and the other end of each embedded steel bar is vertically and fixedly connected with the bottom surface of the end of the channel steel through base concrete. The top face of the end head of the channel steel is perpendicularly and fixedly connected with one end of a secondary edge of the steel formwork in a crossed mode through beam end supporting concrete, the other end of the secondary edge of the steel formwork is perpendicularly and fixedly connected with the back face of a panel of the steel formwork, and the panel of the steel formwork is of a rectangular flat plate structure. The four embedded steel bars, the two steel channels, the base concrete, the beam end supporting concrete and the steel formwork are connected to form pedestals, and a plurality of pedestals are spliced to form the pedestal device. The pedestal device for UHPC beam field assembly is simple in structure and convenient to use, and the UHPC beam assembly operation efficiency can be greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, and particularly relates to a pedestal device for on-site assembly of UHPC beams. Background Technique

[0002] At present, with the rapid development of concrete materials, Ultra-High Performance Concrete (UHPC) is increasingly widely used in practical engineering fields due to its excellent mechanical properties and durability. In particular, its good crack resistance performance is 3-4 times that of ordinary concrete components. Combining prestressed technology with UHPC can achieve precast forms with larger spans, and at the same time significantly improve the integrity and stiffness of precast components.

[0003] Due to the high requirements for equipment and site in the construction of UHPC, UHPC beams need to be precast in sections in the factory, transported to the site in sections for assembly and tensioning, and then the cast-in-place top slab is poured. In the past, the assembly of UHPC beam segments was completed in the precast beam yard near the project and then transported to the construction site by a beam transporter for hoisting and positioning. The assembly occupies the precast pedestal in the beam yard, and secondary transportation is required after assembly, which occupies more construction resources and costs more. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a pedestal device with a simple structure, convenient use, and capable of greatly improving the splicing operation efficiency of UHPC beams.

[0005] The technical solution of the utility model is: a pedestal device for on-site assembly of UHPC beams, including: embedded bars, channel steel, and steel formwork. One end of the embedded bar is inserted into the ground and vertically fixedly connected to the ground. The other end of the embedded bar is vertically fixedly connected to the bottom surface of the end of the channel steel through base concrete. The top surface of the end of the channel steel is vertically and cross-fixedly connected to one end of the secondary rib of the steel formwork through beam-end support concrete. The other end of the secondary rib of the steel formwork is vertically fixedly connected to the back of the panel of the steel formwork. The panel of the steel formwork is a rectangular flat plate structure. Four embedded bars, two channel steels, base concrete, beam-end support concrete, and the steel formwork are connected to form a pedestal, and several pedestals are spliced to form a pedestal device.

[0006] Further, the plane size of the base concrete is slightly larger than the plane size of the steel formwork.

[0007] Further, the beam-end support concrete is located at the end of the pedestal.

[0008] Further, the front surface of the panel of the steel formwork is coated with grease.

[0009] Further, the number of pedestals is 4.

[0010] Advantages of the present utility model:

[0011] 1. A pedestal device for on-site assembly of UHPC beams of the present utility model is fabricated using the formwork of square column piers after being recycled. The fabrication of the pedestal does not require modification of the steel formwork, and the steel formwork can still be used after the pedestal is demolished.

[0012] 2. A pedestal device for on-site assembly of UHPC beams of the present utility model only requires a small amount of concrete and steel bars during construction, featuring fast construction speed and low cost.

[0013] 3. A pedestal device for on-site assembly of UHPC beams of the present utility model enables the assembly of UHPC beams to be carried out near the position to be hoisted, eliminating the need for secondary transfer of beam segments, improving construction efficiency, and reducing construction costs.

[0014] 4. A pedestal device for on-site assembly of UHPC beams of the present utility model can ensure that the beam segment can slide relative to the pedestal during the prestress tensioning of the beam segment assembly, avoiding damage to the beam bottom. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of a pedestal device for on-site assembly of UHPC beams of the present utility model.

[0017] Figure 2 It is a schematic diagram of the usage state of a pedestal device for on-site assembly of UHPC beams of the present utility model.

[0018] In the figure: 1 - ground, 2 - post-inserted bars, 3 - base concrete, 4 - end support concrete, 5 - channel steel, 6 - secondary joist, 7 - steel formwork. Detailed Embodiments

[0019] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.

[0020] As Figure 1-2As shown in the figure, a pedestal device for on-site assembly of UHPC (Ultra-High Performance Concrete) beams includes: embedded bars 2, channel steels 5, and steel formworks 7. One end of the embedded bar 2 is inserted into the ground 1 and fixedly connected to the ground 1 perpendicularly. The other end of the embedded bar 2 is fixedly connected to the bottom surface of the end of the channel steel 5 perpendicularly through the base concrete 3. The top surface of the end of the channel steel 5 is fixedly connected to one end of the secondary rib 6 of the steel formwork 7 perpendicularly and crosswise through the beam-end support concrete 4. The other end of the secondary rib 6 of the steel formwork 7 is fixedly connected to the back of the panel of the steel formwork 7 perpendicularly. The panel of the steel formwork 7 is a rectangular flat plate structure. The four embedded bars 2, two channel steels 5, the base concrete 3, the beam-end support concrete 4, and the steel formwork 7 are connected to form a pedestal, and several such pedestals are spliced to form a pedestal device.

[0021] Preferably, the planar dimension of the base concrete 3 is slightly larger than that of the steel formwork 7.

[0022] Preferably, the beam-end support concrete 4 is located at the end of the pedestal.

[0023] Preferably, the front surface of the panel of the steel formwork 7 is coated with grease.

[0024] Preferably, the number of the pedestals is 4.

[0025] During use, marks are made on the un-paved asphalt bridge surface according to the segmented length of the UHPC beam. The embedded bars 2 are inserted at the joint positions and beam-end positions where the pedestals need to be set. The steel formwork 7 with appropriate dimensions (width equal to or slightly larger than the beam bottom width, 2 - 3 m in length for each section) is installed on the steel bars 2. The top surfaces of each section of the steel formwork 7 are adjusted to the same plane by using a laser level. The pedestals are horizontally level transversely, and a longitudinal slope within 2% can be set according to the site longitudinally. After the elevation and planar position of the steel formwork 7 are adjusted in place, the secondary rib 6 is welded and fixed to the channel steel 5 fixedly connected to the embedded bar 2 to ensure that the steel formwork 7 does not displace during concrete pouring. Forms are installed around the steel formwork, and the base concrete 3 is poured to solidify the channel steel and the embedded bar 2 into a whole, so that the steel formwork 7 has sufficient bearing capacity and stability. At the same time, the beam-end support concrete 4 is poured, and grease is smeared on the panel of the steel formwork 7. The beam section is hoisted onto the pedestal, and the grease can ensure the relative sliding of the box girder with respect to the pedestal, avoiding damage to the beam bottom.

[0026] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Those skilled in the art can make various changes within the scope of their knowledge.

Claims

1. A pedestal device for on-site assembly of UHPC beams, characterized in that: include: An embedded bar (2), a channel steel (5), and a steel formwork (7), wherein one end of the embedded bar (2) is inserted into the ground (1) and vertically fixedly connected to the ground (1), the other end of the embedded bar (2) is vertically fixedly connected to the bottom surface of the end of the channel steel (5) through the base concrete (3), the top surface of the end of the channel steel (5) is vertically cross-fixedly connected to one end of the secondary rib (6) of the steel formwork (7) through the beam end support concrete (4), the other end of the secondary rib (6) of the steel formwork (7) is vertically fixedly connected to the back of the panel of the steel formwork (7), the panel of the steel formwork (7) is a rectangular flat plate structure, four embedded bars (2), two channel steels (5), the base concrete (3), the beam end support concrete (4) and the steel formwork (7) are connected to form a pedestal, and a plurality of the pedestals are spliced ​​to form a pedestal device.

2. A pedestal device for on-site assembly of UHPC beams according to claim 1, characterized in that: The plane dimensions of the base concrete (3) are slightly larger than the plane dimensions of the steel formwork (7).

3. A pedestal device for on-site assembly of UHPC beams according to claim 1, characterized in that: The beam end supporting concrete (4) is located at the end of the pedestal.

4. A pedestal device for on-site assembly of UHPC beams according to claim 1, characterized in that: The front side of the panel of the steel template (7) is coated with lubricating grease.

5. The pedestal device for on-site assembly of UHPC beams according to claim 1, characterized in that: The number of the pedestals is 4.

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