JP3094368B2 - Construction of on-site development pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a reinforced concrete pile constructed on site.

[0002]

2. Description of the Related Art Conventional on-site construction piles have been assembled in a reinforcing bar cage shape by attaching closed-type hoop reinforcements orthogonal to the main reinforcements of the piles to the main reinforcements at predetermined pitches to form lateral reinforcements.

However, in this method, since the number of hoop streaks is large, an enormous amount of labor is required for assembly. In order to make the hoop reinforcement closed, it is common to weld the overlapping portions of the ends, but when using high-strength rebar, the properties of the material deteriorate and welding is impossible. Was. Therefore, the force for restraining the concrete and the axial reinforcement (main reinforcement) is weak, and there is a problem in improving the structural performance of the reinforced concrete pile by on-site construction.

[0004] In order to increase the restraining force between the concrete and the axial reinforcement (main reinforcement), there is a method of increasing the lateral reinforcement, but
There is a limit due to the influence on the filling property at the time of concrete casting, and therefore, in the conventional pile, there is a limit to the improvement of the binding force by the lateral reinforcing bars.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and comprises a high-strength reinforcing bar for an axial reinforcing bar (main bar) and a lateral reinforcing bar (spiral hoop bar). It is an object of the present invention to provide a structure of an on-site formation pile that can be easily assembled without performing welding work.

[0006]

The present invention relates to a method of arranging reinforcing bars for reinforced concrete piles by on-site construction, in which the main reinforcing bars of the reinforced concrete piles are temporarily fixed at predetermined intervals with closed-type setup bars, and then the outer periphery of the main reinforcing bars is connected to the main reinforcing bars. Spiral hoop bars are erected at right angles to each other, and the main bars and spiral bars are tied together to form a reinforced cage. This is a construction of an on-site formation pile, characterized in that a reinforcing rod cage is formed, a reinforcing rod cage having a smaller outer diameter is arranged in a reinforcing rod cage having a larger outer diameter, and the reinforcing rod cage is doubled.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

<A> Overall Configuration FIG. 1 is a side view showing a reinforcement arrangement structure of an on-site formation pile according to the present invention. The main reinforcement 1 is an axial reinforcement of the pile, a setup reinforcement 2 for temporarily fixing the main reinforcements 1 to each other, and a spiral hoop reinforcement 3 erected continuously around the outer periphery of the main reinforcement 1 and fastened to the main reinforcement 1.

<B> Temporary Fixing of Main Bars FIG. 2 is a perspective view showing a state where the main bars 1 are temporarily fixed by the setup bars 2. The setup bar 2 is a closed type reinforcing bar, and has a circular shape in this embodiment. Setup 2
In addition to flat bars, flat steel, L-shaped steel, channel steel, H-shaped steel and the like can be used. In this embodiment, a case where a reinforcing bar is used as the setup bar 2 will be described. When the cross section of the on-site formation pile is square, the setup streaks 2 are of course also square. Since the reinforcing bar used in the present invention does not require welding work, a high-strength reinforcing bar can be used, and therefore, the force for restraining the concrete and the main bar 1 can be increased, thereby improving the structural performance of the pile. be able to. Arrange the setup streaks 2 at predetermined intervals in the extension direction of the main streaks 1,
The main bars 1 are arranged at a predetermined pitch in the circumferential direction of the setup bars 2 and tightened. The connection between the main reinforcement 1 and the setup reinforcement 2 may be performed by any method such as a binding wire without welding.

<C> Incorporation of Spiral Hoop Reinforcement FIG.
It is a perspective view showing the state where spiral hoop muscle 3 is built in continuously. The inner diameter of the spiral hoop 3 is set to be slightly larger than the outer diameter of the main bar 1 arranged in a circular shape so that the spiral hoop 3 can be efficiently built when the spiral hoop 3 is continuously built around the main bar 1. .

<D> Tightening of the main muscle and the spiral hoop muscle In FIG. 1, after the spiral hoop muscle 3 has been built around the outer periphery of the main muscle 1, the main muscle 1 and the spiral hoop muscle 3 are tied by an arbitrary method such as a binding wire. Reinforcing cage 4 is completed.

[0012]

[Embodiment 2] FIG. 4 is a side view showing another embodiment of the present invention, and FIG. 5 is a plan view thereof. In the present embodiment, a small-diameter reinforcing bar cage 42 is disposed on the inner peripheral surface of the reinforcing bar cage 4 (hereinafter, referred to as a large-diameter reinforcing bar cage 41) according to the first embodiment to form a double-structured reinforcing bar cage. (FIG. 5,
FIG. 6) Although the pitch of the main reinforcing bar 1 of the small-diameter reinforcing bar cage 42 is coarser than that of the main reinforcing bar 1 of the large-diameter reinforcing bar cage 41, the main reinforcing bar 1 and the spiral hoop bar 3 may be further increased according to the design strength of the pile. .

[0013]

Since the present invention has been described above,
The following effects can be obtained. <B> Since welding work is not required, there is no fear of embrittlement due to welding. <B> Since the spiral hoop bars are built in a state where the main bars are temporarily fixed by the setup bars, the assembling of the reinforcing bar cage is facilitated. <C> Since the high-strength reinforcing bar can be used for the spiral hoop bar, the structural performance of the pile can be improved. <D> Since high-strength reinforcing bars can be used for spiral hoop bars and can be arranged in double, the range of concrete restraining strength by the hoop bars is large, and structural performance against horizontal force can be significantly improved. it can. <E> Since the hoop streaks can be doubled according to the design strength of the pile, the necessary hoop streaks can be arranged without increasing the pitch of the hoop streaks and without impairing the filling property of the concrete. it can. <F> Shorter construction period, lower cost, and improved structural performance.

[Brief description of the drawings]

FIG. 1 is a side view showing a reinforcement arrangement structure of an on-site formation pile according to the present invention.

FIG. 2 is a perspective view showing a state in which main bars are temporarily fixed by setup bars.

FIG. 3 is a perspective view showing a state in which spiral hoop muscles are continuously built around the outer periphery of a main muscle.

FIG. 4 is a side view showing another embodiment.

FIG. 5 is a plan view of the same.

FIG. 6: A small-diameter steel cage is placed on the inner peripheral surface of a large-diameter steel cage,
The side view which shows the state made into a steel cage of a double structure.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-36288 (JP, A) JP-A-51-127530 (JP, A) Fully open 1979-197532 (JP, U) Really open 1983 54441 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 5/00-5/80

Claims (2)

(57) [Claims] The present invention relates to a method of arranging reinforcing bars for reinforced concrete piles by on-site construction, wherein the reinforcing bars of the reinforced concrete piles are temporarily fixed at predetermined intervals by closed type setup bars, and then spirally wound around the outer periphery of the reinforcing bars at right angles to the main reinforcing bars. The construction of a site-created pile, characterized by the continuous construction of hoop bars and the connection of main bars and spiral bars to form a reinforcing bar cage. 2. The construction of an on-site formation pile according to claim 1, wherein two reinforcing rod cages having different outer diameters are formed, and a reinforcing rod cage having a smaller outer diameter is placed inside the reinforcing rod cage having a larger outer diameter. An on-site construction pile structure characterized by arranging and reinforced cages doubly.