JP2000045269A - Reinforcement building-in method of cast-in-place pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement building-in method of a cast-in-place pile capable of constructing the cast-in-place pile favorable in workability and of high quality by a simple method. SOLUTION: A lower part frame 3 is arranged on a lower part of a building-in frame 2 set on a construction foundation G surface, a spiral tie hoop 6 on which connecting wires to keep constant intervals are installed is arranged on the lower part frame 3, and one end of the tie hoop 6 is fixed on the lower part frame 3. Thereafter, an upper part frame 4 is arranged on an upper part of the building-in frame 2, the other one end of the tie hoop 6 is fixed on the upper part frame 4, after a flexible reinforcement 5 is inserted into a guide pipe 41 installed on the upper part frame 4, its lower end part is fixed on the lower part frame 3, and the lower part frame 3, the flexible reinforcement 5 and the tie hoop 6 are simultaneously lowered in a drilled hole H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a flexible reinforcing bar when driving a cast-in-place pile.

[0002]

2. Description of the Related Art Conventionally, a method of hanging a pre-assembled reinforced cage on the ground at a place where a cast-in-place pile is to be cast and joining the reinforced cage in a borehole has been conventionally performed. However, these conventional methods have the following problems. Depending on the construction site, there is less space above the pile head and the length of the reinforced cage must be shortened, which increases the number of joints and reduces workability. Since there are many joint locations, it is a structural weak point. Due to the construction site, there is no space to put the reinforced cage,
It takes time and labor to transport from another place. In order to solve these problems, there is a method using a flexible reinforcing bar, but this method also has the following problems. Rebar baskets need to be processed at the same time as building,
It takes time to attach the reinforcing bar, and the workability decreases. Rebar baskets need to be processed at the same time as building,
It is necessary to have a temporary place for the steel bars near the construction site. Since it is necessary to secure a space for attaching the reinforcing bar in the building device, the mounting stand becomes large and uneconomical.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and a cast-in-place pile having a high workability and a high-quality cast-in-place pile by a simple method. An object of the present invention is to provide a method of building a reinforcing bar.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for installing a flexible reinforcing bar and a band reinforcing bar used for a cast-in-place pile,
A lower frame is placed below the gantry installed on the construction base, and a spiral-shaped rebar with a connecting wire that keeps a certain interval is placed on the lower frame, and one end of the rebar is attached to the lower frame. At the same time, place the upper frame on the top of the gantry, fix the other end of the reinforcing bar to the upper frame, insert the flexible reinforcing bar into the guide pipe attached to the upper frame, and lower the lower end Fix to the frame, lower frame, flexible rebar,
This is a method of building a cast-in-place pile, characterized by simultaneously lowering the band reinforcing steel into the borehole.

[0005]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Configuration FIG. 1 is an overall sectional view showing a method of installing a reinforcing bar for a cast-in-place pile according to the present invention. Reinforcing device 1 for cast-in-place piles includes a gantry 2 installed on the construction base G surface, a lower frame 3 arranged below the gantry 2, and an upper frame 4 arranged above the gantry 2. It consists of.

<B> Building Stand 2 The building stand 2 is installed on the construction base G of the cast-in-place pile, and the center of the building stand 2 is arranged so as to coincide with the center of the drill hole H. A lower frame 3 is arranged at a lower part of the gantry 2, and an upper frame 4 is arranged and fixed at an upper part of the gantry 2.

<C> Lower Frame FIG. 2 is a perspective view showing the arrangement of the lower frame 3, the upper frame 4, the flexible reinforcing bars 5, and the band reinforcing bars 6. In FIG. 2, the lower frame 3 is a frame for fixing the lower end of the flexible rebar 5, and has a structure in which holes for allowing the flexible rebar 5 to be inserted at predetermined intervals using, for example, a strip steel plate or the like. Or any other structure.

<D> Upper Frame The upper frame 4 is arranged and fixed above the gantry 2 and has a structure similar to that of the lower frame 3. A guide pipe 41 for guiding the flexible reinforcing bar 5 is fixed to the upper surface of the upper frame 4.

[0010]

With reference to the accompanying drawings, a method of installing a reinforcing bar for a cast-in-place pile will be described below.

<A> Installation of a mounting stand In FIG. 1, a construction base G of a drill hole H for driving a cast-in-place pile is shown.
On the top, the mounting base 2 is installed so that the center of the mounting base 2 and the center of the drill hole H match. In the upper part of the erection stand 2,
The upper frame 4 is arranged and fixed, and the
, The center of the upper frame 4 and the center of the hole H are to be installed.

<B> Arrangement of the lower frame A lower frame 3 is arranged at the same level as the construction base G under the gantry 2. The lower frame 3 is fixed to a flexible reinforcing bar 5 and a band reinforcing bar 6 to be described later, and need only be arranged below the mounting stand 2.

<C> Arrangement and fixation of the strip reinforcing bar On the lower frame 3, a strip reinforcing bar 6 is disposed. As shown in FIG. 3, the arranged reinforcing bars 6 are folded up and down, and when the reinforcing bars 6 are expanded up and down, connecting wires 7 that maintain a constant interval are attached. FIG. 4 is a side view showing a state where the band reinforcing bar 6 is expanded up and down. After the reinforcing bar 6 is placed on the lower frame 3, one end of the reinforcing bar 6 is connected to the lower frame 3.
Is fixed by welding or the like. Further, the other end of the band reinforcing bar 6 is fixed to the upper frame 4 by welding or the like.

<D> Draw-out and fixation of the flexible reinforcing bar The flexible reinforcing bar 5 is inserted into the guide pipe 41 of the upper frame 4 fixed to the gantry 2, and the flexible reinforcing bar 5 is arbitrarily extended to the lower frame 3 arranged below the gantry 2. Withdraw in the manner described above. The lower end of the flexible reinforcing bar 5 is fixed by being inserted into a hole 31 provided at a predetermined interval in the lower frame 3. (FIG. 2) It should be noted that the fixing method may be any method other than insertion through the hole 31.

<E> Installation of Flexible Reinforcing Bar FIG. 5 is a sectional view showing a state immediately before the flexible reinforcing bar 5 is installed in the hole H. In this state, the belt rebar 6
Are fixed to the upper and lower frames 4 and 3, and the lower end of the flexible reinforcing bar 5 is fixed to the lower frame 3.
The flexible rebar 5 is sequentially fed into the guide pipe 41 by an arbitrary method, and the lower frame 3 is lowered into the drill hole H, so that the flexible rebar 5 and the band rebar 6 fixed to the lower frame 3 are simultaneously. It descends and takes the form of a reinforced cage and is built in the borehole H. Since the upper and lower ends of the band reinforcing bar 6 are fixed to the upper and lower frames 4 and 3, the band reinforcing bar 6 is expanded by the lower frame 3 being lowered, and is maintained at intervals by the connecting wires 7 which maintain a constant interval. Will be attached.

<F> Cutting of Flexible Rebar FIG. 6 is a cross-sectional view showing a state where the lower frame 3 reaches the bottom surface S of the hole H. After the lower frame 3 reaches the bottom surface S, the flexible reinforcing bar 5 is cut by the construction base G, and the reinforcing bar construction work of the cast-in-place pile is completed.

[0017]

Since the present invention has been described above,
The following effects can be obtained. <B> Since the upper and lower ends of the belt reinforcing bar are simply fixed to the upper and lower frames, they are automatically attached to the flexible reinforcing bar, thereby improving workability. <B> Since the processing of the strip rebar is performed in another place, it is only necessary to transport and install it at the site, a temporary storage place is unnecessary. <C> Since it is a compact device, it can be easily moved and installed. <D> Because the device is compact, it can be easily installed even when the space above the installation site is low. <E> Since rebar construction work can be performed continuously without a joint, efficient construction is possible. <F> Since it is a cast-in-place pile without a joint, a cast-in-place pile that is structurally stable can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall cross-sectional view of a method of installing a reinforcing bar for a cast-in-place pile according to the present invention.

FIG. 2 is a perspective view showing an arrangement state of a lower frame, an upper frame, a flexible reinforcing bar, and a belt reinforcing bar.

FIG. 3 is a side view showing a state in which the belt reinforcing bar is folded up and down.

FIG. 4 is a side view showing a state in which a belt reinforcing bar is expanded up and down.

FIG. 5 is a sectional view showing a state immediately before a flexible reinforcing bar is erected in a drill hole.

FIG. 6 is a sectional view showing a state in which the lower frame reaches the bottom surface of the hole;

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Keitaro Mori 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Toshihiko Kobayashi 1--25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Taisei Corporation F term (reference) 2D041 AA01 DA03 EB10

Claims (1)

[Claims] Claims: 1. A method for mounting a flexible reinforcing bar and a band reinforcing bar used for a cast-in-place pile, comprising: a lower frame disposed below a mounting base installed on a construction base surface; A spiral-shaped reinforcing bar with a connecting wire that holds the wire is placed, one end of the reinforcing bar is fixed to the lower frame, and an upper frame is placed on the top of the gantry, and the other end of the reinforcing bar is After the flexible rebar is inserted into the guide pipe attached to the upper frame and fixed to the frame, the lower end is fixed to the lower frame, and the lower frame, the flexible rebar and the band rebar are simultaneously lowered into the drill hole. The method of laying steel bars in place.