JP2003020644A - Reinforcing bar cage for cast-in-place pile and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement clip suitable for respective non-welded means, a reinforcing bar cage for a cast-in-place pile using a reinforcement clamp, a reinforcement clip or a cross band, and a manufacturing method for the reinforcing bar cage for a cast-in-place pile used in the underground part in a bridge for a road, an overhead railway for a super-express train, or a high-rise building. SOLUTION: This reinforcing bar cage for the cast-in-place pile is constructed of a plurality of long main reinforcements 1 arranged along the pile axial direction, ring-type built-up bars 2 assembled to the inside of the main reinforcements 1 and arranged in the pile axial direction at fixed intervals, reinforcement clamps 4 connecting intersection parts between the built-up bars 2 and the main reinforcements 1, hoop reinforcements 3 wounded around the outside of the main reinforcements 1 and arranged at predetermined intervals in the pile axial direction, reinforcement clips 5 fixing the front end wrap parts in the hoop reinforcements 3, a cross band 6 connecting the intersection parts between the main reinforcements 1 and the hoop reinforcements 3 together, a spacer reinforcement 7 installed to the main reinforcements 1 for spacing the drilled hole and the reinforcement cage, and a spacer clip 8 for mounting the spacer reinforcement 7 to the main reinforcements 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar basket for cast-in-place piles used for underground parts such as road bridges, elevated Shinkansen bullet trains and high-rise buildings, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, cast-in-place piles have been used in important places such as road bridges, Shinkansen viaducts, and high-rise buildings. The size, length and structure of the piles are calculated by the designer and designed, and depending on the structure of the upper part, the pile diameter of the cast-in-place pile is up to ¢ 800mm ~ ¢ 4,000mm. Has a length of 10m to 80m, and the diameter of the reinforcing bar is D-19.
mm ~ D-51mm, hoop muscle D-10mm ~ D-32mm.
The manufacturing method of the reinforcing bar cage is 1) attaching the main bar to the assembly bar by welding to form the cage frame, 2) inserting the circularly processed hoop bar to the outside of the frame bar, and 3) connecting the main bar and the hoop bar. Welding or binding (intersection line) at the intersecting points,
The lap portion of the hoop muscle is fixed by flare welding at a length 10 times the diameter of the reinforcing bar, 4) the spacer muscle is fixed to the main muscle or the hoop muscle by welding, and 5) the bottom muscle is also attached by welding. An important part of the cast-in-place pile reinforcement basket is the wrap portion of the hoop reinforcement, and if the wrap portion of the hoop reinforcement is broken, the pile may break. Since the Great Kobe Earthquake, this has been emphasized, and the A-
Qualified person of 2F or more is flare welding 10d (10 times) of the reinforcing bar diameter. In flare welding, even if the welded portion is strong, both ends of the weld become brittle due to the heat of the welding, and if a tensile test is carried out in an industrial test or the like, it will break from both ends of the weld. As an alternative method to flare welding, there is also a method of bending both ends of the hoop muscle into a hook shape, that is, a shape in which both ends of the hoop muscle processed into a circular shape are bent inside the circle, but this cannot be taken when fixing it. We are doing some welding. It is a good method to attach hooks to both ends of the hoop muscle, but welding at the time of fixing may break the welded portion, so that there is no point in bending into a hook shape.
Also, some patents have been applied for the metal fittings that bind the intersections of the main bars and the hoops, but the intersections of the main bars and the hoops are not so important in the cast-in-place pile reinforcement cage. It is fixed, and then the binding wire is sufficient. What is important is that even if you break it, even a good product will not be usable and there is a risk of causing a serious disaster so that it will not break when you build a steel cage with a crane in a hole drilled by a machine. To prevent this, it is of utmost importance to secure the skeleton of the main muscle and the assembly muscle, and the wrap portion of the hoop muscle.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in a reinforcing bar basket for cast-in-place piles used for underground parts such as road bridges, Shinkansen overpasses and high-rise buildings, the reinforcing bar suitable for each by non-welding means. An object of the present invention is to provide a reinforcing bar basket for cast-in-place piles using a clap, a reinforcing bar clip, and a cross band, and a manufacturing method thereof.

[0004]

To this end, a reinforcing bar basket of a cast-in-place pile according to the present invention is provided with a plurality of long main bars arranged along the axial direction of the pile, and is assembled inside the main bars and is also piled. A ring-shaped assembly bar arranged at a constant interval in the axial direction, a reinforcing bar clamp that connects the intersection of the assembly bar and the main bar, and a coil wound outside the main bar and arranged at a predetermined interval in the axial direction of the pile. A hoop muscle, a rebar clip that fixes the tip lap portion of the hoop muscle, a cross band that connects the intersection of the main muscle and the hoop muscle, and a fixed hole between the excavation hole and the reinforcing steel basket that is attached to the main muscle. It is composed of a spacer bar for providing a space interval and a spacer clip for attaching the spacer bar to the main bar. Also,
The method for manufacturing a reinforcing bar basket of the present invention is a method in which a large number of long main bars are attached to the outside of a ring-shaped assembly bar with a rebar clamp at predetermined intervals to form a frame, and then a hoop bar processed into a circular shape is a main frame. It is wound on the outer side of the above, the wrap portion is fixed with a reinforcing bar clip, the crossing point of the main bar and the hoop bar is stopped with a cross band, and the spacer bar is attached to the main bar at an appropriate position with a spacer clip.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the reinforcing bar basket of the cast-in-place pile of the present invention includes a main bar 1, an assembly bar 2, and a hoop bar 3.
More specifically, more specifically, a plurality of elongated main bars 1 arranged along the pile axial direction, and a ring-shaped member that is assembled inside the main bars 1 and is arranged at regular intervals in the pile axial direction. An assembly bar 2, a reinforcing bar clamp 4 connecting an intersection of the assembly bar 2 and the main bar 1, a hoop bar 3 wound outside the main bar 1 and arranged at a predetermined interval in the pile axial direction, Reinforcing bar clip 5 for fixing the tip wrap portion of the hoop muscle 3
A cross band 6 that connects the intersections of the main bars 1 and the hoop muscles 3; and a spacer bar 7 that is attached to the main bars 1 for maintaining a constant space between the drill hole and the reinforcing bar basket;
A spacer clip 8 for attaching the spacer muscle 7 to the main muscle 1.

As shown in FIG. 2 (a), the reinforcing bar clamp 4 has a semicircular fixing part 9 and 9 connected back to back in a direction intersecting at right angles, and a connecting part of the fixing part 9 as a center. And a screw rod 10 which is attached to one end of the fixed portion 9 through a shaft so as to be swingable and has a screw on the tip side.
And a nut 11 screwed to the tip side of the screw rod 10,
The fixing portion 9 is pivotally attached to the other end through a shaft, and is composed of semicircular pressing portions 13 and 13 each having a forked portion 12 into which the screw rod 10 is fitted.

Next, the case where the reinforcing bar clamp 4 is used at the intersection of the main bar 1 and the assembly bar 2 will be described with reference to FIG. 2 (b). The screw rod 10 and the pressing portion 13 of the reinforcing bar clamp 4 are respectively expanded outward, one fixing portion 9 is fitted inside the main bar 1 and the pressing portion 13 is turned to the main bar 1 side, and the bifurcation of the pressing portion 13 is performed. The portion 12 and the screw rod 10 are fitted together, and the nut 11 of the screw rod 10 is turned to the tightening side to fasten one of the fixing portions 9 to the main bar 1. Since the other fixing portion 9 has already been fitted to the assembly bar 2 from the lower side, the pressing section 13 is turned to the assembly bar 2 side, and similarly, the pressing section 13 is pressed.
The forked portion 12 and the screw rod 10 are fitted to each other, the nut 11 of the screw rod 10 is turned to the tightening side, and the other end of the fixed portion 9 is fastened and fixed to the assembly bar 2. In this way, as shown in FIG. 2C, the intersection of the main bar 1 and the assembled bar 2 is attached to the nut 11
It can be easily fixed by tightening.

As shown in FIG. 3 (a), the reinforcing bar clip 5 has a length of at least twice the diameter of the hoop muscle 3 and has two recesses 14 and 14 on the lower surface to which the hoop muscle 3 fits. The flat plate fixing portion 16 is formed individually, and is further formed with a U-shaped rod-shaped body having screw portions 17 and 17 at both ends, and the screw portion 17 is provided in the hole 15 of the flat plate fixing portion 16. And a nut portion 11, which is screwed into the screw portion 17 of the tightening portion 18 from the flat plate fixing portion 16 side.

Next, FIG. 3B shows a case where the reinforcing bar clip 5 is used for the tip wrap portion of the hoop muscle 3.
It will be described based on. Nuts 1 for two rebar clips 5
1 is loosened and the hoop muscles 3 are fitted into the concave portions 14 of the reinforcing bar clip 5 in advance so that the tip portions of the hoop muscles 3 do not overlap the same concave portions 14. Then, as shown in FIG. 3 (b), after the front end portions of the hoop muscles 3 are lapped (overlapped) in parallel, the respective reinforcing bar clips 5 are moved to the lap portions along the hoop muscles 3 to be opposite to each other. The hoop muscles 3 are fitted into the recesses 14, respectively. Further, tighten the nuts 11 of the respective reinforcing bar clips 5 to
As shown in (c), the tip lap portion of the hoop muscle 3 is tightened and fixed. If the ridges are formed on the outer circumference of the hoop muscle 3 at predetermined intervals, it is possible to prevent the hoop muscle 3 from coming off or the like when tightened and fixed by the reinforcing bar clip 5.

As shown in FIG. 4 (a), the cross band 6 is integrally formed from a thick metal wire and is bent into a substantially elongated U-shape to form a U-shaped bent portion 19, which is further bent. The vicinity of the portion 19 side is bent upward at a right angle in parallel to form a convex portion 20 that fits on the outer circumference of the hoop muscle 3, and the U-shaped open ends are bent inward at right angles to each other so that they substantially overlap. Is provided with a bent portion 21. Therefore, since the tips of the bent portions 21 are not connected to each other, they can be opened.

Next, the case where the cross band 6 is used at the intersection of the main muscle 1 and the hoop muscle 3 will be described with reference to FIG. 4 (b). The bent portion 21 of the cross band 6 is opened to engage the U-shaped bent portion 19 of the cross band 6 with the main bar 1 from below, and both convex portions 20 of the cross band 6 are connected to the hoop line 3 from above. The main muscle 1
The bent portion 21 is hooked on the lower side of the main bar 1 against the elastic force of the cross band 6 along the straight portion of the cross band 6. As a result, at the intersection of the main muscle 1 and the hoop muscle 3, a force acts on the main muscle 1 in the direction of lifting from below, and a force acts on the hoop muscle 3 in the direction of pressing from above. It is clamped and fixed by the elastic force of. As shown in FIG. 4C, the cross bands 6 do not have to be provided at the intersections of all the main muscles 1 and the hoop muscles 3, but may be provided at appropriate intervals.

The spacer muscle 7 is, as shown in FIG. 5 (a),
A straight portion 24 formed of a thick metal wire and fitted in the concave cylinder portion 22 of the spacer clip 8 and a curved portion 25 curved in a convex shape to maintain a space between the excavation hole and the reinforcing bar basket.
Consists of. The spacer clip 8 is shown in FIG.
As shown in (b), a concave cylindrical portion 22 for inserting and supporting the spacer streak 7 is formed in the circumferential portion, and is formed of a cylindrical body with an open end, and one end of the open end swings. One end of the screw shaft 23 is freely fixed, and the nut 1 is attached to the tip of the screw shaft 23.
1 is screwed together, and the other end of the open end is the screw shaft 2
A bifurcated portion 12 to which 3 is fitted is formed, and a screw shaft 23 is fitted into the bifurcated portion 12 and the nut 11 is fastened from the outside, whereby the bifurcated portion 12 can be fastened and fixed. Therefore, the linear portion 24 of the spacer rib 7 is fitted into the concave cylindrical portion 22 of the spacer clip 8, that is, the spacer rib 7
After preparing a spacer clip 8 coupled to the upper and lower ends of the spacer clip, the open end of the spacer clip 8 is expanded to fit the cylindrical portion 26 to the main bar 1, and then the screw shaft 23 is fitted to the bifurcated portion 12. Then, the nut 11 is rotated from the outside to the tightening side to be tightened and fixed. As for the arrangement of the spacer bars 7, as shown in FIG. 5 (c), the reinforcing bar cage inserted into the excavation hole is attached at an appropriate position on the main bar 1 so as to keep a constant space with the excavation hole. .

Next, a method for manufacturing the reinforcing bar basket of the present invention will be described. 1. The main bars 1 are arranged at equal intervals on the outer peripheral side of the annular assembly bars 2 juxtaposed at a predetermined interval, the screw rod 10 and the pressing portion 13 of the reinforcing bar clamp 4 are expanded to the outside, and one fixing portion 9 is fixed to the main bar 1. Fitting inward, turning the pressing portion 13 to the main bar 1 side, fitting the forked part 12 of the pressing part 13 and the screw rod 10, turning the nut 11 of the screw rod 10 to the tightening side, and reinforcing bar to the main bar 1. One of the clamps 4 is tightened and fixed. Since the other fixing portion 9 is already fitted to the assembly bar 2 from the lower side, the pressing portion 13 is turned to the assembly bar 2 side, and the forked portion 12 of the pressing portion 13 and the screw rod 10 are similarly fitted. Let the screw rod 1
0 of the nut 11 is turned to the tightening side, the other end of the reinforcing bar clamp 4 is tightened and fixed to the assembly bar 2, and a large number of main bars 1 are arranged.
To form a cylindrical skeleton. 2. Next, the circularly processed hoop muscles 3 are fitted on the outside of the framed main muscles 1 at regular intervals, and the nuts 11 of the reinforcing bar clips 5 are loosened so that the tip portions of the hoop muscles 3 do not overlap the same recessed portion 14. The recess 14 of the reinforcing bar clip 5 in advance
The hoop muscles 3 are fitted to each. Then, after wrapping (overlapping) the tip portions of the hoop muscles 3 in parallel,
Move each rebar clip 5 along the hoop muscle 3 to the wrap portion and place the hoop muscle 3 in the opposite concave portion 14 respectively.
Are fitted together. Further, the nuts 11 of the respective reinforcing bar clips 5 are tightened to fasten and fix the tip wrap portions of the hoop muscles 3, and the wrap portions of the hoop muscles 3 are firmly fixed by the reinforcing bar clips 5. 3. At the intersection of the main bar 1 and the hoop muscle 3, the bent part 21 of the cross band 6 is opened to engage the U-shaped bent part 19 of the cross band 6 with the main bar 1 from below to cross the hoop muscle 3. Both convex portions 20 of the band 6 are covered so as to engage with each other from above, and the straight portion 2 of the cross band 6 is further attached to the main bar 1.
4, the bent portion 21 is hooked to the lower side of the main bar 1 against the elastic force of the cross band 6 to stop the cross band 6. 4. The spacer bar 7 is prepared such that the spacer clips 8 are coupled to the upper and lower ends of the spacer bar 7, and the open end of the spacer clip 8 is expanded to fit the cylindrical portion 26 into the main bar 1 and then the screw shaft. 23 is fitted to the forked portion 12, the nut 11 is rotated from the outside to the tightening side and tightened and fixed, and each is attached to the main bar 1 by the spacer clip 8. 5. The bottom muscles (not shown) are attached with a cross band 6. For the reinforcing bar clamp 4 and the reinforcing bar clip 5, those suitable for the diameter and weight of the reinforcing bar are used.

[0014]

[Effect] As described above, since the reinforcing bar basket of the cast-in-place pile and the manufacturing method thereof according to the present invention can be performed by a non-welding means using a reinforcing bar clamp, a reinforcing bar clip, a cross band, and a spacer clip suitable for each, The production is easy and the number of production days can be shortened.

[Brief description of drawings]

FIG. 1 is a side view for explaining a reinforcing bar basket of the present invention.

FIG. 2 is a (a) plan view, (b) assembly explanatory view, and (c) assembly cross-sectional view of a reinforcing bar clamp of the present invention.

3 (a) is a front view, FIG. 3 (b) is a plan view, and FIG. 3 (c) is a transverse cross-sectional view of a reinforcing bar clip of the present invention in use.

4A is a perspective view of a cross band of the present invention, FIG. 4B is a perspective view of a use state, and FIG. 4C is an overall front view of the use state.

5A and 5B are perspective views of a spacer clip of the present invention in a usage state, FIG. 5B is an enlarged front view with a part of the usage state omitted, and FIG.
It is the whole front view.

[Explanation of symbols]

1 main line 2 assembly muscle 3 hoop muscle 4 Reinforcing bar clamp 5 rebar clips 6 cross bands 7 Spacer muscle 8 Spacer clip 9 Fixed part 10 screw rod 11 nuts 12 Bifurcation 13 Holding part 14 recess 15 holes 16 Flat plate fixing part 17 screw part 18 Tightening part 19 U-shaped bend 20 convex part 21 Bent 22 Recessed tube 23 screw shaft 24 Straight part 25 curved part 26 Cylindrical part

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Code (Reference) E04G 7/16 E04G 7/16 21/12 105 21/12 105A 105E

Claims (2)

[Claims] 1. A large number of long main bars arranged along the pile axial direction, ring-shaped assembly bars assembled inside the main bars and arranged at regular intervals in the pile axial direction, and the assembly. A reinforcing bar clamp that connects a crossing portion between a muscle and the main muscle,
A hoop reinforcement wound around the outside of the main reinforcement and arranged at a predetermined interval in the pile axial direction, a reinforcing bar clip fixing the tip wrap portion of the hoop reinforcement, and a cross connecting the intersection of the main reinforcement and the hoop reinforcement. A cast-in-place caster, comprising: a band, a spacer bar attached to the main bar and having a constant space between the excavation hole and the reinforcing bar basket, and a spacer clip for mounting the spacer bar to the main bar. Pile rebar basket. 2. A large number of long main bars are attached to the outside of a ring-shaped assembled bar at predetermined intervals with a reinforcing bar clamp to form a frame, and then a circularly processed hoop line is wound on the outside of the framed main bar. Secure the wrap part with a reinforcing bar clip, and further stop the crossing point of the main bar and hoop bar with a cross band,
And a method for manufacturing a reinforcing bar basket, characterized in that spacer bars are attached to the main bars at appropriate positions with spacer clips.