Concrete pouring structure of super-large-span prestressed steel box concrete cover beam

Abstract

The utility model discloses a concrete pouring structure of a super-large-span prestressed steel box concrete cover beam. The structure is provided with a steel box and a V-shaped funnel, and a pouring hole and an exhaust hole are reserved in a top plate of the steel box; the bottom of the V-shaped funnel is connected with a capping beam pouring hole, no gap exists, and concrete enters the box through the funnel. The problems that in the concrete pouring process of the prestressed steel box concrete cover beam, lateral deformation of a steel box is large, and concrete pouring is not compact are mainly solved. According to the mode, pouring holes and exhaust holes are mainly formed in a top plate of the bent cap steel box to ensure that concrete is densely poured in the closed steel box, blocking measures are arranged to prevent the concrete from polluting the steel box, and the out-of-plane stability in the concrete pouring process of the bent cap steel box is ensured by controlling the pouring sequence; and an efficient, safe and environment-friendly construction method is provided for the super-large-span prestressed steel box concrete cover beam.

Description

Technical Field

[0001] This utility model relates to the field of concrete cap beam construction, specifically to a concrete casting structure for an ultra-large span prestressed steel box concrete cap beam. Background Technology

[0002] Bridge engineering is constantly developing towards more lanes and wider bridge decks. Under special conditions such as overpasses, the demand for lateral spacing of bridge piers increases. Conventional cap beams cannot meet the higher loads in large-span scenarios. The design institute proposed a super-large span prestressed steel box concrete cap beam structure. For steel box concrete structures, concrete pouring is usually carried out by using a pump to deliver the concrete from the low end to the high end under pressure. However, this method still has many problems: (1) For super-large span cap beam structures, the height of the cap beam steel box is high. Under the action of the side pressure of the newly poured concrete and the pumping pressure, the steel box will undergo out-of-plane deformation and instability, affecting the structural quality and safety. (2) For super-large span and super-long steel box cap beam structures, the use of a pump to deliver the concrete from the low end to the high end under high pressure requires strict requirements on the concrete spread and fluidity. Long-distance flow inside the box will affect the uniformity of the concrete and affect the density of the concrete. Utility Model Content

[0003] Therefore, to address the aforementioned shortcomings, this utility model provides a concrete casting structure for ultra-large span prestressed steel box concrete cap beams. This application primarily solves the problems of large lateral deformation of the steel box and insufficient concrete compaction during the concrete casting process of prestressed steel box concrete cap beams. This method mainly involves opening casting holes and venting holes in the top plate of the cap beam's steel box to ensure the concrete is cast densely within the sealed steel box, implementing sealing measures to prevent concrete contamination of the steel box, and controlling the casting sequence to ensure out-of-plane stability of the cap beam's steel box concrete during the casting process. This provides an efficient, safe, and environmentally friendly construction method for ultra-large span prestressed steel box concrete cap beams.

[0004] This utility model is achieved by constructing a concrete casting structure for an ultra-large span prestressed steel box girder, characterized in that:

[0005] It has a steel box and a V-shaped funnel.

[0006] Pre-reserve pouring holes and venting holes in the top plate of the steel box;

[0007] The bottom of the V-shaped funnel is connected to the pouring hole of the cap beam, with no gaps, and the concrete enters the box through the funnel.

[0008] According to the present invention, a concrete casting structure for an ultra-large span prestressed steel box girder is characterized in that: the casting hole is arranged at the top plate of the girder, avoiding the pad stone, ensuring the operating space; a steel ring is welded to the top of the casting hole to ensure compactness; and the vent is located at the corner of the support pad stone and the top plate, so that the gas inside the steel box is discharged during the casting process to ensure the compactness of the concrete.

[0009] According to the present invention, a concrete casting structure for an ultra-large span prestressed steel box girder is characterized in that: the inside of the steel box is moistened with water before casting to ensure a more uniform concrete surface during the casting process. Simultaneously, this avoids surface cracks caused by rapid solidification and shrinkage of the concrete surface due to the high thermal conductivity of the steel plate, which would affect the aesthetics and service life of the concrete.

[0010] This utility model has the following advantages: This application mainly solves the problems of large lateral deformation of steel box and non-dense concrete pouring during the concrete pouring process of prestressed steel box concrete cap beam. This method mainly opens pouring holes and venting holes on the top plate of the cap beam steel box to ensure that the concrete is poured densely in the sealed steel box, sets sealing measures to avoid concrete contamination of the steel box, and ensures out-of-plane stability of the cap beam steel box concrete pouring process by controlling the pouring sequence, providing an efficient, safe and environmentally friendly construction method for ultra-large span prestressed steel box concrete cap beam. (1) This utility model proposes an adaptive concrete pouring method for the new structure of ultra-large span prestressed steel box concrete cap beam. (2) The method of this utility model not only ensures the stability of the steel box structure during the ultra-large span steel box concrete pouring process, but also ensures the uniformity and density of the concrete in the box, ensuring construction quality and safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the implementation of the pouring hole cutting method in this application;

[0012] Figure 2 This is a schematic diagram of the concrete pouring sequence in this application;

[0013] Figures 3-4 This is a schematic diagram of the V-shaped funnel for concrete pouring in this application.

[0014] Among them: 1 pouring hole, 2 venting hole, and 3 V-shaped funnel. Detailed Implementation

[0015] The following will be combined with the appendix Figures 1-4 This utility model will be described in detail, and the technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0016] This utility model provides a concrete casting structure for an ultra-large span prestressed steel box girder, such as... Figures 1-4 As shown, it can be implemented in the following manner;

[0017] It has a steel box and a V-shaped funnel. The top plate of the steel box has a pre-reserved pouring hole 1 and a venting hole 2. The bottom of the V-shaped funnel is connected to the pouring hole of the cap beam without gaps, and the concrete enters the box through the funnel.

[0018] In this application, the pouring hole 1 is located at the top plate of the cap beam, avoiding the pad stone, to ensure operating space. A steel ring is welded to the top of the pouring hole 1 to ensure compactness. The vent hole 2 is located at the corner of the support pad stone and the top plate, to expel the gas in the steel box during the pouring process and ensure the compactness of the concrete.

[0019] In this application, the inside of the steel box is moistened with water before pouring to ensure a more uniform concrete surface during the pouring process. Simultaneously, this avoids surface cracks caused by rapid solidification and shrinkage of the concrete due to the high thermal conductivity of the steel plate, which would otherwise affect the aesthetics and service life of the concrete.

[0020] A method for pouring concrete for ultra-large span prestressed steel box girder, with specific operating steps:

[0021] Step 1: Reserve pouring holes and venting holes on the top plate of the steel box. The pouring holes are located at the top plate of the cap beam, avoiding the pad stone, to ensure operating space. A steel ring is welded to the top of the pouring hole to ensure tightness. The venting holes are located at the corner of the support pad stone and the top plate to release the gas inside the steel box during the pouring process, ensuring the compactness of the concrete.

[0022] Step 2: Wet the inside of the steel box with water; Wet the steel box with water before pouring to ensure that the concrete surface is more uniform during the concrete pouring process; At the same time, avoid the large thermal conductivity of the steel plate, which would cause the concrete surface to solidify and shrink rapidly, resulting in surface cracks that would affect the appearance and service life of the concrete.

[0023] Step 3: Install the "V" shaped funnels. The bottom of the funnels is connected to the pouring hole of the cap beam without gaps. Concrete enters the box through the funnels, and the four small funnels are used repeatedly at the top of the cap beam.

[0024] Step 4: Pour concrete into the box repeatedly in two stages to complete the pouring of the bottom and top layers of concrete.

[0025] Step 5: After each area is poured, remove the pouring funnels one by one. Pour concrete from bottom to top until fresh concrete slurry overflows from the pouring port and vent, then stop pouring.

[0026] Step 6, Inspection; After pouring is completed and the structure has been aged for 4 days, the density of the structure is tested.

[0027] This patent has the following advantages and beneficial effects:

[0028] (1) This utility model proposes an adaptive concrete pouring method for a new structure of ultra-large span prestressed steel box concrete cap beam.

[0029] (2) The present invention method not only ensures the stability of the steel box structure during the concrete pouring process of the ultra-large span steel box, but also ensures the uniformity and compactness of the concrete inside the box, thus ensuring the construction quality and safety.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A concrete casting structure for an ultra-large span prestressed steel box girder, characterized in that... ； It has a steel box and a V-shaped funnel (3). Pre-reserve a casting hole (1) and an exhaust hole (2) on the top plate of the steel box; The bottom of the V-shaped funnel (3) is connected to the casting hole of the cap beam without any gap, and the concrete enters the box through the funnel. The pouring hole (1) is located at the top plate of the cap beam, avoiding the pad stone, to ensure the operating space. The top of the pouring hole (1) is welded with a steel ring to ensure compactness. The vent hole (2) is located at the corner of the support pad stone and the top plate. During the pouring process, the gas in the steel box is discharged to ensure the compactness of the concrete.

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