Low-head FRP tube composite pile

Abstract

To solve the problem, in which, currently, when constructing piles for building foundations at low-head construction sites, a lot of work and construction costs are required because reinforcing bar cages are used; the same is true when dismantling piles that use existing reinforcing bar cages; to provide a cast-in-place concrete pile that aims to improve the quality and reduce the work and construction costs by constructing piles using a new construction method that does not use reinforcing bar cages.SOLUTION: After an excavation work for a pile installation site is completed, separate FRP tubes (split FRP pipes), which are structural members manufactured in advance at a factory, are connected on-site to construct an FRP tube formwork that replaces a rebar cage. Then, the concrete to be poured is integrated with the FRP tube formwork to construct a low-head FRP tube composite pile.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a low head FRP.Tube composite pile that does not use rebar and aims to reduce the work involved in low head cast-in-place reinforced concrete pile construction, and a method for constructing the same. [Background technology]

[0002] Currently, the reinforced concrete piles for low-head foundations of buildings in architectural and civil engineering projects are generally constructed by combining a reinforcing bar cage with concrete. In addition to steel, reinforced concrete, and steel reinforced concrete structures, concrete-filled steel tube structures called CFT (Concrete Filled Tubes), which do not require the assembly of rebar or formwork, are increasingly being used for columns in recent years. In addition, fiber-reinforced plastics (FRP: Fiber Reinforced Plastics) are being researched and increasingly used as structural materials and components in place of conventional steel structural components that bear tensile stress, not only in the fields of construction and civil engineering but also in the manufacturing of many products such as aircraft, ships, and vehicles. Summary of the Invention [Problem to be solved by the invention]

[0003] Reinforced concrete piles for building foundations installed at low headroom, such as under bridge girders, require a lot of work and construction costs because they are constructed using reinforcing bar cages. Also, because of the steel cage, it is not easy to dismantle it. The present invention is intended to solve the above-mentioned problems, and its object is to construct foundation piles at a low head height with simple work that does not use reinforcing bar cages. [Means for solving the problem]

[0004] In this invention, the FRP tube formwork, which replaces the reinforcing bar cage, is constructed on-site by connecting the separate FRP tubes (divided FRP pipes), which are structural members fabricated in advance at a factory, after the excavation work for the pile installation site is completed. The poured concrete and the FFRP.Tube formwork are then integrated to create a low head FRP.Tube composite pile. The FRP.Tube formwork that constitutes this low-head FRP.Tube composite pile bears tensile stress, while the concrete bears compressive stress, resulting in a high-quality foundation pile for CFT construction. In addition, the concrete poured on the outside of the FRP.Tube formwork that constitutes the low-head FRP.Tube composite pile is also integrated into the pile, resulting in a foundation pile with even better structural performance. Effect of the Invention

[0005] The aforementioned low-head FRP.Tube composite piles do not require the fabrication and installation of reinforcing bar cages, reducing a lot of labor and construction costs.

[0006] Similarly, since low head FRP.Tube composite piles do not have rebar cages, it can reduce a lot of labor and construction costs when dismantling and removing them.

[0007] The low-head FRP.Tube composite pile of the present invention is a high-quality composite pile that is lighter, more durable, and has better structural performance than general reinforced concrete piles because the FRP.Tube formwork is lightweight and rust-resistant. [Brief description of the drawings]

[0008] [Figure 1] 1 is a plan view, a cross-sectional view, and an appearance view of an embodiment of a low-head FRP.Tube composite pile according to the present invention. [Diagram 2] 1 is a detailed plan view and a detailed cross-sectional view of an embodiment of a low-head FRP.Tube composite pile according to the present invention. FIG. [Diagram 3] The figure shows an appearance of a separate FRP tube (split FRP pipe), which is a structural member that constitutes the FRP tube formwork of the low-head FRP tube composite pile of the present invention, and an appearance of a perforated dowel FRP partial formwork, which is a component of the separate FRP tube. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The low head FRP.Tube composite pile of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall plan view and cross-sectional view of a low head FRP.Tube composite pile. Low head FRP.Tube composite piles are constructed on-site by combining the FRP.Tube formwork with concrete. The FRP.Tube formwork that constitutes this low head FRP.Tube composite pile bears the tensile stress, while the concrete bears the compressive stress, resulting in a high quality FRP composite pile for CFT construction.

[0010] Figure 2 shows a detailed plan view and a detailed cross-sectional view of the low head FRP.Tube composite pile. The FRP.Tube formwork is constructed by joining factory-fabricated separate FRP.Tubes (split FRP pipes) on-site. Furthermore, the FRP.Tube formwork is integrated with the concrete poured after connecting the separate FRP.Tubes (split FRP pipes) at the perforated dowel portion of the perforated dowel FRP partial formwork, to construct a CFT FRP composite pile.

[0011] Figure 3 shows the appearance of the separate FRP tube (split FRP tube) and its constituent parts, as well as the perforated dowel FRP partial formwork. Separate FRP Tubes (split FRP tubes) that have been manufactured in advance at the factory by joining and assembling perforated dowel FRP partial formwork are transported to the site and joined together. [Explanation of symbols]

[0012] 1 Low head FRP.Tube composite pile 2. FRP Tube Formwork 3. Concrete 4 Separate FRP Tube (split FRP tube) 5 Perforated dowel FRP partial formwork 6 Perforated dowel 7 Connection bolt

Claims

1. Low head FRP. Tube synthetic pile.

2. The FRP tube formwork for the low head FRP tube composite pile according to claim 1.

3. A separate FRP tube (split FRP pipe) constructed by connecting the FRP tube formwork according to claim 2 at a site.

4. A perforated dowel FRP partial formwork intended for improving the connection and strength of the separate FRP tube (split FRP pipe) of claim 3 and for constructing a composite pile by integrating the FRP tube formwork with a concrete section.

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