JPH1136289A - Fixing method for flexible reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a cast-in place pile of good quality efficiently in a simple constitution by collapsing the tip of a flexible reinforcing bar inserted in an insert hole of a lower frame, filling the collapsed part with a flowable hardening agent to form a ball block part, and then fixing a lower frame to the ball block part. SOLUTION: A flexible reinforcing bar storing device 1 and a frame 2 are installed on the construction foundation G of a cast-in place pile, a center hole jack 3 is fitted to the central part of the frame 2, and a guide pipe 4 for the flexible reinforcing bar is fitted to the frame. A flexible reinforcing bar 5 is inserted in an insert hole of a lower frame 6, the tip thereof is collapsed, and the collapsed part is filled with a flowable hardening agent to form a ball block part 7. After the lower frame 6 is fixed to the ball block part 7, the flexible reinforcing bar 5 is lowered in the drilled hole 9 by a suspending wire 8 supporting the lower frame 6 and simultaneously a shearing reinforcing bar 10 is wound round the flexible reinforcing bar 5. The reinforcing bar 5 is lowered to the bottom of the drilled hole 9 and concrete in water is placed in the drilled hole 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Similar to the method of fixing a PC cable, a method of fixing a flexible reinforcing bar serving as a main reinforcing bar of a cast-in-place pile is as shown in FIGS. In general, a method of attaching the anchor 11 to the surrounding concrete by supporting the anchor plate 12 is adopted. However, in these conventional methods, there is a problem that the cost of manufacturing the steel crimp grip and the anchor plate at the distal end is expensive, and it is impossible to expect an economic effect.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is an economical, workable, high-quality cast-in-place pile constructed by a simple method. It is an object of the present invention to provide a method of fixing a flexible rebar which can be performed.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method of fixing a flexible reinforcing bar used for a cast-in-place pile, by inserting the flexible reinforcing bar into an insertion hole of a lower frame, crushing the tip of the flexible reinforcing bar, and crushing the reinforcing bar. A method for fixing a flexible reinforcing bar, characterized in that a lower frame is fixed to a spherical portion after filling a fluid hardener into a spherical portion and the lower frame is fixed to the spherical portion. Flexible rebar is a fixing method of a flexible rebar characterized by being a plurality, and a spherical mass formed by filling a crushable portion with a flowable hardener is formed for each flexible rebar. It is a fixing method of a flexible rebar characterized by the fact that a spherical mass formed by filling a crushable portion with a flowable hardening agent collects the crushed portions of a plurality of flexible rebars. A method of fixing a flexible reinforcing bar, and a method of fixing a flexible reinforcing bar, wherein the flexible reinforcing bar to be inserted into the insertion hole is tightened by a wedge. During the descent, fix the flexible reinforcing bar at the lower end and add another place cast pile flexible reinforcing bar, crush the expanded flexible reinforcing bar tip, fill the crushed portion with a flowable hardening agent and remove the spherical mass. It is a method of fixing a flexible reinforcing bar, characterized in that, after formation, the ball portions are collected on a pile core of a cast-in-place pile, and furthermore, the vertical position of the ball portions collected on the pile core is two places. A fixing method of a flexible reinforcing bar characterized by being dispersed as described above.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

<A> Overall Configuration FIG. 1 is a side sectional view showing the construction of a method for fixing a flexible reinforcing bar according to the present invention. The flexible rebar storage device 1 and the gantry 2 are installed on the construction base G of the cast-in-place pile, the center hole jack 3 is attached to the center of the gantry 2, and the flexible pipe guide pipe is attached to the gantry 2. As described above, after the preparatory work for laying the flexible reinforcing bar of the cast-in-place pile is completed, the distal end of the flexible reinforcing bar 5 is inserted into the insertion hole of the lower frame 6, the flexible reinforcing bar distal end is crushed, and the fluidity is applied to the crushed portion. The spherical mass 7 is formed by filling a hardening agent. After fixing the lower frame 6 to the ball mass 7, the suspension wires 8 supporting the lower frame 6
While the flexible reinforcing bar 5 is lowered into the hole 9 of the cast-in-place pile by the center hole jack 3, the shear reinforcing bar 10 is wound around the flexible reinforcing bar 5, descends to the bottom of the hole 9, and the underwater concrete enters the hole 9. And complete.

<B> Formation of ball mass portion The formation of the ball mass portion will be described below.

FIG. 2 is an enlarged perspective view of the flexible rebar 5 in which the tip is crushed. The flexible reinforcing bar 5 is formed by twisting a plurality of high-strength strands 51. The wire 5 is compressed by using a jack or the like in the axial direction over a length of 15 to 20 times the diameter from the tip of the flexible rebar 5 and crushed.
1 is outwardly plastically deformed in a U-shape.

FIG. 3 shows a mortar 71 filled in the crushed portion and
FIG. 4 is an enlarged perspective view showing a state in which a is formed. As described above, the portion where the tip of the flexible reinforcing bar 5 is crushed is covered with the cloth frame 72 and the mortar 71 is injected into the inside.

FIG. 4 is an enlarged perspective view showing a state where the spherical mass 7 is fixed to the flexible reinforcing bar 5. After the mortar 71 is injected into the cloth formwork 72, the mounting band 74 is tightened on the ring projection 73 provided on the flexible reinforcing bar 5, and the cloth formwork 72 is formed.
Is formed, and the formation of the ball block 7 is completed.

<C> Fixation of Bulb Portion FIG. 5 is an enlarged perspective view showing a state immediately before the lower frame 6 is mounted on the ball mass portion 7. The lower frame 6 is a ring-shaped steel plate and has insertion holes 61 through which the flexible reinforcing bars 5 are inserted at predetermined intervals. The insertion hole 61 is tapered downward so that the diameter of the hole decreases. In the lower frame 6, a suspending piece 62 for being suspended by the suspending wire 8 is provided. FIG. 6 is an enlarged perspective view showing a state in which the lower frame 6 is fixed to the ball block 7. By moving the lower frame 6 until it comes into contact with the ball portion 7, the tensile force acting on the flexible reinforcing bar 5 is integrated with the lower frame 6 to operate the fixing mechanism. In this state, a tapered steel wedge 13 is driven into the gap between the lower frame 6 and the flexible reinforcing bar 5, and the flexible reinforcing bar 5 and the shear reinforcing bar 10 are fixed with the lower frame 6 suspended so as not to drop. (FIG. 7)

<D> Drop of Reinforcement Basket After assembling the flexible reinforcement 5, the shear reinforcement 10, and the lower frame 6 constituting the reinforcement cage on the construction base G, the suspension wire 8 of the center hole jack 3 is drilled. 9 Lower to the bottom. (Fig. 1)

<E> Concrete Casting A tremy pipe (not shown) is suspended in the drilled hole 9 and submerged concrete is cast to complete the construction of the cast-in-place pile.

[0014]

[Embodiment 2] FIG. 8 is a perspective view showing a case where a plurality of flexible reinforcing bars 5 are inserted into one insertion hole 61 to form a spherical mass 7. As shown in FIG. The ball mass 7 is formed for each flexible reinforcing bar 5. (FIG. 9)

[0015]

Third Embodiment FIG. 10 is a perspective view showing a case in which a plurality of flexible reinforcing bars 5 are inserted into one insertion hole 61 and the ball portions 7 are integrated into one. .

[0016]

[Embodiment 4] FIG. 11 shows Embodiment 4 of the present invention.
And FIG. 12 is a partially enlarged longitudinal sectional view of FIG. In the case of cast-in-place piles, the upper part of the pile has a larger bending or shearing sectional force. Therefore, it is necessary to increase the number of flexible reinforcing bars 5 at the upper part of the pile. In the present embodiment, according to the first embodiment of the present invention, the flexible reinforcing bar 5 is fixed, and during the descent, a flexible reinforcing bar additional reinforcing bar 51 for another cast-in-place pile is added. The spherical mass 7 is formed in the same manner as in the first embodiment. In the present embodiment, a component corresponding to the lower frame 6 is not required. When the flexible reinforcing bars 51 are added, the ball portion 7 is squeezed by the squeezed ring reinforcing bars 14.
To collect in the core of the cast-in-place pile. Moreover, it arrange | positions so that the up-and-down position of each sphere part 7 collected by the pile core may be disperse | distributed to two or more places. Thereby, all of the fixing points are not concentrated on the same position, and the dispersion of the stress can be measured.

[0017]

Since the present invention has been described above,
The following effects can be obtained. <A> An economical and effective structure can be achieved without using expensive steel crimping grips and anchor plates for fixing flexible reinforcing bars of cast-in-place piles. <
B> Since the fixing body was made into a spherical mass by mortar filling,
Work efficiency is good. <C> Flexible reinforcing bars have been added above the cast-in-place piles, so it can cope with bending and shearing forces acting intensively on the upper part of the pile.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a fixing method of a flexible reinforcing bar according to the present invention.

FIG. 2 is an enlarged perspective view in which the tip of a flexible reinforcing bar is crushed.

FIG. 3 is an enlarged perspective view showing a state where a ball block is formed.

FIG. 4 is an enlarged perspective view showing a state in which a ball portion is fixed to a flexible reinforcing bar.

FIG. 5 is an enlarged perspective view showing a state immediately before the lower frame is placed on the ball portion.

FIG. 6 is an enlarged perspective view showing a state in which a lower frame is fixed to a ball block.

FIG. 7 is an enlarged perspective view showing a state where a tapered steel wedge is driven.

FIG. 8 is a perspective view showing a case in which a plurality of flexible reinforcing bars are inserted into one insertion hole to form a ball portion.

FIG. 9 is a perspective view in which a spherical mass is formed for each flexible reinforcing bar.

FIG. 10 is a perspective view showing a case where ball blocks are combined into one.

FIG. 11 is a longitudinal sectional view showing the entire other embodiment.

FIG. 12 is a partially enlarged longitudinal sectional view of the above.

FIG. 13 is a perspective view showing a conventional flexible reinforcing bar fixing method.

FIG. 14 is a perspective view of the same.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihide Shiraishi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Toshihiko Kobayashi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (7)

[Claims] 1. A method for fixing a flexible reinforcing bar used for a cast-in-place pile, comprising inserting a flexible reinforcing bar into an insertion hole of a lower frame, crushing a tip portion of the flexible reinforcing bar, and filling a crushable portion with a fluid hardener. A method of fixing a flexible reinforcing bar, comprising: forming a ball mass portion, and then fixing a lower frame to the ball mass portion. 2. The method of fixing a flexible reinforcing bar according to claim 1, wherein the flexible reinforcing bar inserted into the insertion hole of the lower frame is:
A method for fixing a flexible reinforcing bar, comprising a plurality of bars. 3. The method of fixing a flexible reinforcing bar according to claim 2, wherein the sphere portion formed by filling the crushing portion with a flowable hardening agent is formed for each flexible reinforcing bar. How to fix flexible rebar. 4. The method for fixing a flexible reinforcing bar according to claim 2, wherein the spherical mass formed by filling the crushing portion with a fluid hardener is formed by crushing portions of a plurality of flexible reinforcing bars. A method for fixing a flexible reinforcing bar. 5. The fixing method for a flexible reinforcing bar according to claim 1, wherein the flexible reinforcing bar inserted into the insertion hole is tightened by a wedge. 6. The flexible reinforcing bar according to claim 1, wherein the flexible reinforcing bar serving as the lower end of the cast-in-place pile is fixed, and another flexible cast-in-place pile is added during the descent. A method for fixing a flexible reinforcing bar, comprising: crushing a tip portion, filling a crushed portion with a fluid hardener to form a ball portion, and collecting the ball portion on a pile core of a cast-in-place pile. 7. The method for fixing a flexible reinforcing bar according to claim 6, wherein the vertical positions of the ball masses collected on the pile core are dispersed at two or more places. Method.