JP2009127413A - Cross spiral-reinforcement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a cross spiral-reinforcement structure by largely making a crushing-resistant force by reinforcements used for a concrete structure larger than reinforced structures crosswise arranged in a conventional device, largely shortening working hours at a construction site by facilitating a standardization and a mass production and improving a performance and a profitability while being capable of being adapted to the shape of an object concrete body by a working to the shape such as not only a cylindrical shape but also a square-pole shape, an elliptic cylindrical shape and a plane shape or the like by a secondary working. <P>SOLUTION: Righthand wound or left hand wound spiral reinforcements being manufactured by stretching spirally wound steel stripes used for the reinforcements and having the same diameter or approximately the same diameter are arranged at regular intervals and both ends are fixed. The diameters of the spiral reinforcements on one side are shrunk or expanded slightly by a twisting and inserted, and returned to original states and superposed and assembled in a closely attached shape. Linear vertical reinforcements are arranged to the spiral reinforcements as required, and connected by a welding and a clamping, thus manufacturing the cross spiral-reinforcement structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing bar structure used for reinforcing concrete columns and beams.

  In order to increase the crushing resistance of columns, beams, walls, and piles that are concrete structures, ordinary reinforcing bars and deformed reinforcing bars are used to increase the strength. In general, the structure is a reinforcing bar structure in which strips or stirrups that are thinner than the main bars are attached in layers at regular intervals outside the main bars arranged in a quadrangular column or cylinder, or a hoop is wound in a spiral shape.

  Since concrete is very strong against compressive force but weak against tensile force, a concrete structure reinforced with reinforcing bars as described above is common. However, repeated strong bending pressure causes cracks in the concrete, leading to brittle fracture. In addition, thin hoop muscles such as the stirrup muscles and striated muscles of the portion are often cut or deformed and the main muscles are spread and destroyed in many cases. This is also a characteristic of reinforcing bars arranged in parallel in both vertical and horizontal directions.

  The cross spiral rebar according to the present invention enhances the crushing resistance and the containment force, and increases the strength of the concrete structure. In addition, it enables mass production through standardization at factories and work sites, improving work efficiency and achieving uniform quality and low costs.

  The cross spiral rebars assembled in a cylindrical shape are processed into a shape such as a square column shape, an elliptical column shape, and a flat shape by secondary processing by pressing, thereby making it possible to manufacture a reinforcing bar structure that matches the concrete structure to be built.

  The spiral wound reinforcing rod is produced by stretching the reinforcing rod wound in a coil shape with the same or almost the same diameter of the right and left turns. A plurality of reinforcing bars are arranged at equal intervals, attached to a jig or a special device, and then twisted or expanded in reverse to give a slight diameter difference between them. The small-diameter side is inserted into the large-diameter side, combined in a cross shape, returned and brought into close contact, and an appropriate portion is welded or fastened to produce the crossed swirl bar illustrated in FIG.

  Furthermore, it is set as the cross spiral reinforcement structure which combined the vertical reinforcement 3 as FIG. 2 as needed.

  The above-described cross spiral reinforcing bars assembled in a columnar shape are processed into a quadrangular prism, an elliptical column, a flat shape, or the like by pressing with a press die or pulling from the left, right, left, or top.

  Compared to conventional reinforced concrete structures with main bars, ribs and strips, using cross spiral bars strengthens the concrete restraining force, increases the crushing resistance, and increases the buckling prevention effect.

  Standardization enables mass production at a factory or construction site facility, and installation work such as a hoop is omitted, making it easy to equalize quality.

  The cross-shaped spiral rebar effectively works against bending pressure in any direction, and at the same time has the function of the conventional main reinforcement.

  Embodiments of the present invention will be described below with reference to FIGS. FIGS. 7 and 8 show an example of an assembly apparatus for crossed reinforcing bars used in the embodiments of FIGS.

  1 and 2 show an example of a practical form of a cross spiral reinforcing bar structure used for a pillar such as a concrete building according to the present invention. In the illustrated example, the outer right-handed reinforcing bar 1 and the inner left-handed reinforcing bar 2 are arranged at equal intervals in the illustrated example to constitute a cross spiral reinforcing bar. Further, the vertical bars 3 are arranged in order to effectively join the reinforcing bars and the beam bars that are arranged vertically. Spiral rebars have a round shape of 45 degrees when viewed from the side, in the case of the illustrated example, by winding a normal round steel or deformed rebar into a coil shape and stretching it.

  After assembling the left and right spiral rebars as shown in the diagram, the cross spiral rebars are assembled by welding and fastening the appropriate locations. In the illustrated example, the end of the reinforcing bar is sandwiched between the vertical bending bars 3 in the center direction, but the bending direction and position can be freely set. Similarly, the number and position of the vertical stripes 3 are selected based on necessity.

  The concrete rebar is arranged mainly to prevent crushing due to the tensile force generated on one side by bending pressure. In a conventional reinforcing bar structure in which a main bar is wrapped with a hoop or hoop, cracked concrete generated by repetitive vibrations, etc., is broken or deformed by strong pressure, and the restraint force is drastically reduced, causing it to be shattered at once and buckling. In the case of cross spiral reinforcing bars, the spiral reinforcing bars in both directions on the tension side are pulled strongly, and the interval is difficult to expand, and the concrete restraining force and the buckling prevention force are remarkably improved. The vertical reinforcing bars 3 are also increased in strength as in the case of the conventional main reinforcing bars, but when combined with the cross spiral reinforcing bars, the synergistic effect of the crushing resistance becomes extremely large.

  The assembly of cross spiral rebars as shown in the figure, which is standardized and manufactured in large quantities, cannot be performed efficiently by manual work at a construction site or the like. Therefore, we use a dedicated jig or device provided at the factory or work site. Therefore, the problem can be solved by increasing the diameter of the outer reinforcing bars of the same or substantially the same diameter of the spiral reinforcing bars arranged at equal intervals, or by reducing the diameter of the inner reinforcing bars and returning them to their original positions. Both internal and external spiral reinforcing bars may be expanded or contracted.

  An example of an assembling apparatus when there are eight right-handed reinforcing bars 1 on the outside and eight left-handed reinforcing bars 2 on the inner side will be described with reference to FIGS. Both ends of the outer right-hand reinforcing bar 1 are attached at equal intervals by a fixture 8 of the outer fixing base 7 and placed above the abutment 12. Similarly, both sides of the inner left-handed reinforcing bar 2 are attached to the fixture 15 of the inner fixing base 10. The fixture 15 is attached to a lever 13 installed on a shaft 14 provided on the outer periphery of the inner fixing base 10 and can rotate within a certain range. The inner fixed base 10 is slightly rotated in the right direction in FIG. 8 with respect to the fixed shaft 9 by the worm gear 11. Since the opposite inner fixed base is fixed or rotated in the opposite direction, the attached left-handed reinforcing bar 2 is twisted and the outer diameter is slightly reduced, and the inside of the right-handed reinforcing bar on the outer side as shown in the figure. Can be inserted smoothly. Of course, the assembly work before insertion is performed outside the outer right-handed spiral reinforcing bar. When the worm gear 11 is turned in the opposite direction after being completely inserted and the shape of the inner spiral reinforcing bar 2 is restored to increase the diameter, the inner and outer spiral reinforcing bars are brought into close contact with each other. If necessary, shape is retained by welding or fastening appropriate points. Further, when the binding force is insufficient at the upper and lower ends of the cross spiral reinforcing bar, it can be reinforced by the spear reinforcing bar 4 as in the conventional reinforcing bar structure.

  If the crossed spiral reinforcing bar is long and difficult to manufacture, it may be shortened to the desired length after assembling as described above. For example, it is effective when the length is very large with respect to the diameter like a reinforcing bar of a pile or a utility pole.

  The embodiment shown in FIG. 3 is a cross spiral reinforcing bar structure having no vertical reinforcing bars used for columns and piles without an added portion. The vertical streak 3 can be omitted in a case where a side pressure or a heavy pressure from other structures is not applied, such as a utility pole having a large length ratio to the outer diameter, or a case where the pressure is small. The winding angle of the spiral reinforcing bar is set larger than the previous example and set to 60 degrees.

  The degree of extension of the spiral reinforcing bar can be freely selected from about 10 ° to about 80 °, for example, depending on the purpose.

  In addition, when the column is tapered, the reinforcing bar is wound after being tapered, and then stretched and combined with the right-handed and left-handed spiral reinforcing bars in the same manner as in Example 2 to correspond to a loosely tapered electric pole. Can produce cross spiral rebar structures. Moreover, it can respond by the same method, such as making a part into a taper shape or making it thin in a circular arc shape.

  FIG. 4 shows a columnar reinforcing bar made according to the first and second embodiments, which is made into a quadrangular prism shape by breathing from four directions and can be used for a concrete column or a beam. The press die 6 has a convex shape in consideration of return when the reinforcing bar is bent. Press in two directions to make an elliptical cylinder, or make the cross section rectangular to correspond to a beam or the like.

  5 and 6 are examples of processing into a flat shape to cope with reinforcement of a concrete wall or the like. The cylindrical cross spiral rebars are pressed from both sides to form, and at that time, the cross sections on both sides are shifted so as to form a uniform cross as seen from the side as shown in the figure. At the time of molding, not only the pressure from the side surface but also the crossed rebars at both ends may be pulled strongly to make it more linear at the flat part. If necessary, the vertical reinforcing bars 3 are inserted and welded or fastened in a flat state to produce reinforcing bars as shown in FIGS.

  2 is a cross-sectional view of the cross spiral reinforcing bar structure according to the present invention, taken along line BB in FIG.   1 is a side view of the reinforcing bar structure, above the line BB is a cross-sectional view of the line AA of FIG.   In the side view of only the cross spiral reinforcing bar, the section above the line CC is a cross section of the central portion.   A cross-sectional view of a concrete column in which cylindrical cross spiral reinforcing bars are made into quadrangular columns by secondary processing and built in as reinforcing bars.   The side view which processed the cross spiral rebar in the shape of a plane in order to use it for a wall surface etc.   The left end part is shown in the enlarged sectional view of line DD in FIG.   FIG. 9 is a cross-sectional view taken along the line FF in FIG.   Sectional drawing of line EE of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Right-handed reinforcing bar 2 Left-handed reinforcing bar 3 Longitudinal reinforcing bar 4 Attached bar reinforcing bar 5 Concrete pillar 6 Press type 7 Outer fixing stand 8 Fixing tool 9 Fixed shaft 10 Inner fixing stand 11 Worm gear 12 Abutment 13 Lever 14 Shaft 15 Fixing tool

Claims (3)

  The stretched right-handed and left-handed spiral reinforcing bars are polymerized in close contact with each other at the required number of intervals, and if necessary, the vertical reinforcing bars are arranged inside. And the cross spiral reinforcement structure which fixes and assembles an appropriate part by welding or fastening.   The cross spiral rebar structure assembled into a cylindrical shape by the method shown in the above section is applied to the shape of a column, beam, wall, etc. by pressing or pulling from the side. Cross spiral rebar structure formed into a flat shape.   As the means for assembling cross spiral rebars according to claim 1, the right-handed and left-handed spiral rebars of the same diameter or substantially the same diameter are arranged at equal intervals and fixed at both ends, and one or both of them are fixed. Twist and rotate the spiral rebar to narrow or expand it, change the diameter of the inner and outer spiral rebars, fit them with a slight gap, and then turn the twist back to bring them into close contact Assembly method for reinforcing bar structure.

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