JP2006046031A - Non-welding fixing hardware of main reinforcement of cast-in place pile - Google Patents

Non-welding fixing hardware of main reinforcement of cast-in place pile Download PDF

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Publication number
JP2006046031A
JP2006046031A JP2004245972A JP2004245972A JP2006046031A JP 2006046031 A JP2006046031 A JP 2006046031A JP 2004245972 A JP2004245972 A JP 2004245972A JP 2004245972 A JP2004245972 A JP 2004245972A JP 2006046031 A JP2006046031 A JP 2006046031A
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Japan
Prior art keywords
main
bar
cast
reinforcing
pile
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Pending
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JP2004245972A
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Japanese (ja)
Inventor
Nobuhiro Sakaguchi
伸宏 坂口
Original Assignee
Kyoto Supeesaa:Kk
株式会社京都スペーサー
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Priority to JP2004245972A priority Critical patent/JP2006046031A/en
Publication of JP2006046031A publication Critical patent/JP2006046031A/en
Pending legal-status Critical Current

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Abstract

It has been clarified in the investigation of the engine that welding means in the fixing method of the reinforcing bar of the reinforcing bar used for the cast-in-place pile and the reinforcing ring causes a lack of strength due to a cross-sectional defect or alteration of the main bar. Therefore, it is necessary to develop a hardware capable of firmly fixing the main bar and the reinforcing ring without welding.
SOLUTION: A round steel having a diameter of 8 to 12 mm is used in accordance with the main reinforcement diameter of a cast-in-place pile, and a shape that exhibits a strength that does not deform when a tightening nut is tightened on a threaded end of both ends. Characteristic shape to prevent the main part from escaping and fixing force to be damaged when the main part is pressed and the main bar of the pile and the reinforcing ring are tightened with the tightening nut Provided with a hardware combination with an accessory having
[Selection] Figure 1

Description

  The present invention relates to a reinforcing bar for a pile of a large-scale building. In large-scale buildings, piles that reach the bedrock are driven below the pressure platen that is the foundation. This pile stably supports the entire building. The present invention relates to a hardware for fixing a main reinforcing bar and a reinforcing ring so that a reinforcing bar arranged in the pile does not buckle.

Conventionally, in order to reinforce a concrete pile, the main bar arranged at a predetermined pitch in the pile and the ring that is inscribed in the main bar to prevent buckling of the main bar are fixed by welding. It was.
Recently, however, as a result of investigations on reinforced concrete buildings that collapsed, especially in the Great Hanshin Earthquake, it was found that cross-sectional defects or alterations in the reinforcing bars had a significant effect on the strength, and the design standards for frame strength were impaired. Welding to reinforcing bars is being banned.
The main bars of cast-in-place piles are no exception, and the appearance of hardware that can be firmly fixed without welding the main bars and their reinforcing rings is awaited.

Welding to fix the main bars arranged in the cast-in-place piles and their reinforcing rings leads to serious problems such as cross-sectional defects and alteration of the main bars, which are the main frames. There is a need for a hardware that can firmly fix the main reinforcement and its reinforcing ring.
In the welding method, it is necessary to consider the influence of the weather in addition to the deterioration due to the welding itself as described above. That is, the welding work associated with the construction of cast-in-place piles is inevitably an outdoor work, but the welding process in rainy weather is known to have a significant adverse effect in the presence of moisture when trying to ensure the quality of the welded part. This is virtually impossible. Therefore, from the viewpoint of the construction period, which is one of the most important elements in all construction work in a sense, there is a demand for a method of fixing the main bar of the pile and the reinforcing ring that is completely independent of the weather.
In addition, the number of main bars arranged in the pile varies depending on the outer diameter and depth of the pile required in the design, but the above-mentioned hardware needs to be installed at the intersection of the main bar and the required part of the reinforcing ring. Yes, the required number of hardware is considerable. Therefore, when considering the marketability of this hardware, it is necessary to reduce the cost as much as possible and to approach the fixed price by cheap welding.

  As a result of diligent research, the present inventor succeeded in producing a main part of the fixed metal fitting by pressing a commercially available round steel bar into a predetermined length and screwing both ends thereof in only one step. In addition, the attached plates used in combination with this main part have succeeded in exerting a strong fixing force with an extremely simple shape.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a state of a main bar of a pile and a reinforcing ring before mounting a fixed hardware according to the present invention, (a) is an image diagram when a steel strip is used for the reinforcing ring, and (b) shows an angle similarly. It is an image figure at the time of using. Here, reference numeral 1 is a main bar of the pile, and reference numeral 2 is a reinforcing ring.
FIG. 2 is a view when a metal fastening nut according to the present invention is placed inside a main bar (called a rod) which is assembled in a cylindrical shape when the reinforcing ring is a steel strip, and (c) is a front view, (d) ) Is a side view, and (e) is a top view. FIGS. 3A and 3B are views when a metal clamping nut is arranged on the outside of the ridge, FIG. 3F is a front view, FIG. 3G is a side view, and FIG. 3H is a top view. FIG. 4 is a view when a metal fastening nut according to the present invention is disposed inside the bag when the reinforcing ring is at an angle, (i) is a front view, (j) is a side view, and (k) is a top view. It is. FIGS. 5A and 5B are views when a metal clamping nut is arranged on the outside of the ridge, wherein FIG. 5L is a front view, FIG. 5M is a side view, and FIG.

  In these drawings, reference numeral 3 denotes a main part of the hardware according to the present invention, in which both ends of the round steel are threaded and then bent into a predetermined shape as shown in the figure by pressing. Similarly, reference numerals 4 and 5 are accessories for preventing the main portion of the product of the present invention from escaping from the main bar and the reinforcing ring when the tightening nut 6 is tightened.

The non-welded fixing hardware of the cast-in-place pile main bar, which is the present invention having the above-described configuration, has a very simple mechanism for fixing the main bar of the pile and the reinforcing ring as described above. In both cases, the manufacturing cost has been reduced, and sufficient marketability has been achieved.
Further, as a result of the pull-out test, it was confirmed that one piece of the metal withstands up to 2.5 t even at the most important fixing force in the non-welded fixed metal. Although this depends on the size of the kite and the location where it is lifted by heavy equipment, it is 2 to 8 in terms of a so-called safety factor, and a satisfactory result was obtained.
In addition, although it does not have the property of testing, it can be used without being influenced by the weather as described above, so it exhibits a significant advantage in terms of both quality assurance and construction period management.

D32, with a deformed reinforcing bar with a length of 8m as a main reinforcing bar, 26 main reinforcing bars arranged in the circumferential direction of the heel, and a steel strip with a cross-sectional thickness of 9mm and a width of 75mm in a ring shape with a diameter of 1300mm In the reinforcing bar cage, which has a total of 4 reinforcement rings, one each on the top and bottom and two equally on the center, all the intersections between the top and bottom reinforcement rings and the main reinforcement, and the two reinforcement rings at the center At every intersection between the main bar and the main bar, non-welded fixtures according to the present invention were used. Therefore, a total of 78 non-welded fixtures were used in this reinforcing bar.
The total weight of the heel was 1540 Kgf in total of the 26 main bars, the spiral bars wound around the outer periphery of the heel, and the four reinforcing rings.
The diameter of the round steel, which is the main part of the non-welded fixture used in the above-mentioned reinforcing bar rod, is 9.5 mm, and the thickness of the accessory is 4.5 mm.

  The rebar rods manufactured in the above manner were lifted with two wire ropes by heavy machinery and stored in a vertical shaft with a diameter of 1500 mm dug as a cast-in-place pile, but from the beginning of lifting until it was stored in a predetermined position, It was confirmed that there was no misalignment of the main bars, and there was no deformation of the entire bag, and that it had sufficient marketability.

An image of the main bars and reinforcement rings of cast-in-place piles. A metal fitting that secures the main bar and steel strip by placing a tightening nut inside the cage. A metal fitting that secures the main bar and the steel strip by placing a tightening nut on the outside of the cage. A metal fitting that secures the main bar and the angle by placing a tightening nut inside the cage. A hardware that secures the main bar and the angle by placing a tightening nut on the outside of the cage.

Explanation of symbols

1. Main bar of pile 2. Reinforcement ring 3. Main part of this non-welded hardware 4. Accessories of this non-welded hardware 5. Accessories of this non-welded hardware 6. Tightening nut

Claims (1)

  1. A hardware having a characteristic shape for firmly fixing a main bar assembled in a cylindrical shape for use in a cast-in-place pile and a reinforcing ring for preventing buckling inscribed therein.
JP2004245972A 2004-07-30 2004-07-30 Non-welding fixing hardware of main reinforcement of cast-in place pile Pending JP2006046031A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004245972A JP2006046031A (en) 2004-07-30 2004-07-30 Non-welding fixing hardware of main reinforcement of cast-in place pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004245972A JP2006046031A (en) 2004-07-30 2004-07-30 Non-welding fixing hardware of main reinforcement of cast-in place pile

Publications (1)

Publication Number Publication Date
JP2006046031A true JP2006046031A (en) 2006-02-16

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Family Applications (1)

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JP2004245972A Pending JP2006046031A (en) 2004-07-30 2004-07-30 Non-welding fixing hardware of main reinforcement of cast-in place pile

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010174557A (en) * 2009-01-30 2010-08-12 Sanwa Seisakusho:Kk Assembly structure of reinforcing bars and method of assembly of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010174557A (en) * 2009-01-30 2010-08-12 Sanwa Seisakusho:Kk Assembly structure of reinforcing bars and method of assembly of the same

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