Rectangular hollow pier head section embedded long reinforcing steel precise and fast positioning device

Abstract

This utility model discloses a precise and rapid positioning device for pre-embedded long steel bars in the first section of a rectangular hollow pier. The device includes a positioning platform with four columns distributed at the four corners. Multiple diagonal braces and main beams connect adjacent columns. Multiple platform beams on the main beams form n layers of positioning platforms, where n is a natural number greater than or equal to 2. Each positioning platform includes platform treads mounted on the platform beams. The center of the positioning platform has a rectangular opening, and multiple hook-shaped connectors are provided inside the opening. All hook-shaped connectors on the same layer of the positioning platform jointly support a frame-type positioning clamp. Multiple equally spaced arc-shaped slots are provided on the inner wall of the positioning clamp. The positioning clamp consists of four straight segments and four curved segments connected end-to-end. Adjacent straight and curved segments are fixedly connected by at least two bolts.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction, and in particular to a device for precise and rapid positioning of long steel bars pre-embedded in the first section of a rectangular hollow pier. Background Technology

[0002] During bridge construction, for high-pier structures, due to the relatively low stiffness of the pier columns, plastic hinges easily form at the top and bottom of the piers under seismic loads. Therefore, the bottom of the piers usually needs to be designed as ductile members during the design phase. The elastoplastic deformation of the ductile members aims to extend the structural period and reduce the seismic response of the structure. Specifically, the stirrups in this area are densified, and it is also necessary to ensure that the main reinforcement bars cannot be connected in the densified section.

[0003] For the first segment of a rectangular hollow pier, the main reinforcement bars must extend a certain length into the pier cap, and they must not be cut and connected in the stirrup reinforcement zone. This results in a relatively long overall length of the main reinforcement bars (generally around 10 meters). Meanwhile, the pier base is the location of the greatest stress on the pier structure, where the diameter of the main reinforcement bars is large, and they often use a double-limb structure. Before constructing the concrete for the first segment of the pier, the main reinforcement bars need to be pre-embedded in the pier cap. On-site construction will encounter the following problems: 1) The pre-embedded reinforcement bars are too long and have a large weight. During installation, the spacing and verticality of the pre-embedded reinforcement bars cannot be guaranteed, making precise positioning difficult. This can result in excessively thick or thin concrete cover, and in severe cases, pier column misalignment. 2) The cantilever reinforcement bars in the upper part are prone to lateral bending, making installation inconvenient, affecting the speed of installation work, and posing certain safety risks.

[0004] The traditional method of marking and positioning for pre-embedded reinforcing bars involves first marking the position of the reinforcing bars on a positioning hoop, and then welding the reinforcing bars to the hoop. While this method is relatively simple, it is labor-intensive, has poor positioning accuracy, and low construction efficiency, and can no longer meet the requirements of standardized construction.

[0005] Therefore, a method or apparatus is needed to solve the above problems. Summary of the Invention

[0006] This utility model aims to address the aforementioned shortcomings of existing technologies by proposing a precise and rapid positioning device for the first section of long pre-embedded reinforcing bars in rectangular hollow piers. This device features a simple structure, ingenious design, and reasonable layout, and can improve the accuracy and quality of pre-embedded reinforcement while achieving precise and rapid positioning of pre-embedded reinforcing bars.

[0007] The technical solution of this utility model is: a precise and rapid positioning device for the first section of a rectangular hollow pier with pre-embedded long steel bars, characterized in that: the device includes a positioning platform, the positioning platform includes four columns 1 distributed at the four corners, and multiple diagonal braces 2 and multiple main beams 3 are connected between adjacent columns 1. Multiple platform beams 4 are used to construct n layers of positioning platforms on the main beams 3, where n is a natural number greater than or equal to 2. The positioning platform includes platform treads 5 set on the platform beams 4.

[0008] The positioning platform has a rectangular opening in the middle, and multiple hook-shaped connectors 6 are provided on the inner side of the opening. All the hook-shaped connectors 6 on the same layer of the positioning platform jointly support the frame-type positioning fixture 7.

[0009] The positioning fixture 7 has multiple equally spaced arc-shaped slots 8 on its inner wall.

[0010] The positioning clamp 7 consists of four straight segment clamps 9 connected end to end and four curved segment clamps 10. Adjacent straight segment clamps 9 and curved segment clamps 10 are fixedly connected by at least two bolts.

[0011] Each positioning platform is equipped with a protective railing 11 on its outer side, and the protective railing 11 is fixedly connected to the diagonal brace 2 and the main beam 3.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] This type of rectangular hollow pier pre-embedded long rebar positioning device features a simple structure, ingenious design, and reasonable layout. Addressing the difficulty of rapid and accurate positioning of traditional pre-embedded ultra-long rebars, it employs a unique structure. Utilizing columns, main beams, and diagonal braces, it constructs a multi-layered platform. Positioning clamps are installed inside the openings at the center of each platform, with multiple evenly spaced arc-shaped slots. Simply connecting the rebar to be pre-embedded to the same slot on different platforms achieves precise positioning. This effectively solves the problem of precise and rapid positioning of long rebar in the first stage of rectangular hollow piers, achieving millimeter-level precision control. It also promotes standardized construction and refined management on-site, improving the overall pass rate of rebar spacing and concrete cover. Furthermore, it increases construction efficiency, shortens the construction period, reduces safety risks and labor intensity, saves project costs, and creates significant economic benefits. Therefore, this rapid positioning device possesses numerous advantages and is particularly suitable for widespread application in this field, with a very broad market prospect. Attached Figure Description

[0014] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0015] Figure 2 This is a top view of a single-layer positioning platform in an embodiment of this utility model.

[0016] Figure 3 This is a schematic diagram of the straight segment clamp and the curved segment clamp in the embodiments of this utility model. Detailed Implementation

[0017] The specific embodiments of this utility model will be described below with reference to the accompanying drawings. Figure 1 , Figure 2 , Figure 3 The diagram illustrates a precise and rapid positioning device for pre-embedded long reinforcing bars in the first section of a rectangular hollow pier. The device includes a positioning platform comprising four columns 1 distributed at the four corners. Multiple diagonal braces 2 and multiple main beams 3 connect adjacent columns 1. Multiple platform beams 4 on the main beams 3 form n layers of positioning platforms, where n is a natural number greater than or equal to 2. Each positioning platform includes platform treads 5 mounted on the platform beams 4.

[0018] The positioning platform has a rectangular opening in the middle, and multiple hook-shaped connectors 6 are provided on the inner side of the opening. All the hook-shaped connectors 6 on the same layer of the positioning platform jointly support the frame-type positioning fixture 7.

[0019] The positioning fixture 7 has multiple equally spaced arc-shaped slots 8 on its inner wall.

[0020] The positioning clamp 7 consists of four straight segment clamps 9 connected end to end and four curved segment clamps 10. Adjacent straight segment clamps 9 and curved segment clamps 10 are fixedly connected by at least two bolts.

[0021] Each positioning platform is equipped with a protective railing 11 on its outer side, and the protective railing 11 is fixedly connected to the diagonal brace 2 and the main beam 3.

[0022] The working process of the precise and rapid positioning device for the first section of the rectangular hollow pier with pre-embedded long steel bars in this utility model embodiment is as follows: First, a positioning platform is built on the pier cap 12. Considering both the manufacturing cost and positioning accuracy, the optimal number of layers for the positioning platform is 3 (i.e., n=3). To facilitate workers' operation on the positioning platform, the height of each layer of the positioning platform is 2m. For safety reasons, a protective railing 11 is installed on the outside of each layer of the positioning platform.

[0023] After the foundation reinforcement is tied, the cross lines of the pier body are measured and laid out. Based on the layout points, the positioning clamps 7 in the rectangular opening in the middle of the positioning platform of each layer are installed. The positioning clamps 7 are fixed to the positioning platform by multiple hook-shaped connectors 6, that is, there are a total of 3 positioning clamps 7. At the same time, it is necessary to ensure that the corresponding arc-shaped slots 8 on the positioning clamps 7 in different layers are on the same straight line as the layout points in the longitudinal direction, so as to ensure the accurate positioning of the subsequent embedded reinforcement.

[0024] The pre-embedded steel bars in the pier body are placed into the corresponding arc-shaped slots 8 on multiple positioning clamps 7, and the roots are spot-welded to the pier cap steel bars to ensure the verticality of the steel bars. After all the pre-embedded steel bars in the pier body are connected according to the above operation, the pre-embedding work is completed.

[0025] It is important to note that the spacing of the embedded steel bars should be measured during subsequent construction, and the thickness of the protective layer of the steel bars should be tested after the first section of concrete is poured to verify the reliability of the device.

Claims

1. A precise and rapid positioning device for pre-embedded long steel bars in the first section of a rectangular hollow pier, characterized in that: The device includes a positioning platform, which includes four columns (1) distributed at the four corners. Multiple diagonal braces (2) and multiple main beams (3) are connected between adjacent columns (1). Multiple platform crossbeams (4) are used to construct n layers of positioning platforms on the main beams (3), where n is a natural number greater than or equal to 2. The positioning platform includes platform treads (5) set on the platform crossbeams (4). The positioning platform has a rectangular opening in the middle, and multiple hook-shaped connectors (6) are provided on the inner side of the opening. All the hook-shaped connectors (6) on the same layer of the positioning platform jointly support the frame-type positioning fixture (7). The positioning fixture (7) has multiple equally spaced arc-shaped slots (8) on its inner wall. The positioning clamp (7) consists of four straight segment clamps (9) connected end to end and four curved segment clamps (10). The adjacent straight segment clamps (9) and curved segment clamps (10) are fixedly connected by at least two bolts.

2. The precise and rapid positioning device for the first section of the pre-embedded long steel bar of the rectangular hollow pier according to claim 1, characterized in that: Each positioning platform is equipped with a guardrail (11) on its outer side, and the guardrail (11) is fixedly connected to the diagonal brace (2) and the main beam (3).

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