JPH08239898A - High strength structure - Google Patents

Abstract

PURPOSE: To provide a structure with high strength and enable a free design by preventing exfoliation of a hardener and enlarging the effective cross-section of the structure. CONSTITUTION: A spiral stirrup reinforcement 2 is arranged in such a state as surrounding the circumference of a plurality of main reinforcements 1 arranged at appropriate intervals and a rust-proof metal plate is wound around this circumference so as to be formed into a winding sheath. A hardening material such as concrete 5 is filled in the winding sheath 4 so as to be hardened. In the case of executing it to an establusned structure, the metal plate is wound around the plastered mortar so as to be made into the winding sheath. Because exfoliation of the concrete 5 is prevented by the sheath 4, the stirrup reinforcement 2 can be arranged in the vicinity of the circumferential edge of the structure so as to be a structure having constraint effects and large effective cross- section. The diameter, the thickness, and the pitch of the spiral stirrup reinforcement 2 can be freely selected so as to actualize a free design.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength structure which can be used as a pillar, a beam, or a pile to be buried in the ground, and particularly as a new structure or a reinforcement of an existing structure. Also relates to a high strength structure that can be adopted.

[0002]

2. Description of the Related Art When constructing or manufacturing pillars, beams, or structures such as piles buried in the ground with cement-based hardening material such as concrete, a steel pipe is used and cement-based hardening is applied inside the steel pipe. A configuration in which the material is filled and cured is considered. The steel pipe is a structure having an extremely high strength by restraining the hardened material on the inner side and preventing the hardened material from being broken by the restraining force even if the hardened material is cracked by the load. However, in addition to technical problems in welding, this steel pipe
There is a problem that it is relatively expensive and that the size of the steel pipe is limited because it has been marketed, and it is difficult to accommodate a free design.

In order to obtain the effect of restraining the hardened material in the same manner as the steel pipe, a spiral stirrup streak is embedded near the outer periphery of the structure, and the stiffened material is restrained by the spiral stirrup streak to construct It is also possible to adopt a configuration that enhances the strength of.

[0004]

With the structure in which the above-mentioned spiral stirrup muscle is embedded, the following problems occur. 6 and 7 show a pile using the spiral stirrup a, and the spiral stirrup a surrounds a plurality of main bars b. This rebar a
・ B is placed in concrete c. A fogging d is formed around the spiral stirrup a, but this part is easily peeled off, and there is a problem of corrosion of the stirrup a, which cannot be extremely reduced. In other words, the spiral stirrup muscle diameter Dem becomes considerably smaller than the structure diameter Do. In this case, the number of concrete c constrained by the spiral stirrup streak a becomes small in the whole, and in reality, a considerably small cross-sectional portion can be calculated in the final proof stress as compared with the one constructed or manufactured as a structure.

Another problem in the case of using the spiral stirrup bar a is the problem of the concrete c coming out from between the pitches of the stirrup bar a. That is, since the stirrup bar a does not restrain the concrete c between the pitches, if the concrete c is cracked by a load acting load that is larger than the assumed load, the concrete c will fall out from between the reinforcing bars a. . Figure 7 shows the crack
As shown by hatching on both left and right sides of the structure shown in FIG.
The concrete c to bite into the inside of
The effective diameter Dem of is smaller than the diameter of the stirrup muscle a. In other words, of the cross section of the actual pile or pillar,
In reality, the cross-section that can be calculated at the time of final proof stress as a structure is much smaller than that assumed at the time of design.

The present invention has been made in order to solve the above problems, and provides a high-strength structure which is inexpensive, can be used for free design, and can obtain a large strength as a structure. The purpose is to

[0007]

In the high-strength structure according to the present invention, a spiral stirrup bar is arranged so as to surround a plurality of main bars arranged at appropriate intervals. Further, a cylindrical winding sheath is arranged so as to surround this.
The winding sheath is manufactured by spirally winding a rust-proof metal plate. As for the rustproof property, in addition to the case where the material is stainless steel, a steel plate coated with zinc or resin, or galvanized iron can be used. In the case of winding such a metal plate, the side edges of the metal plate, which are displaced at each pitch, are crimped to form a single tubular wiping sheath. The inside of this wiping sheath is filled with a hardening material such as concrete or mortar and hardened to form a structure.

[0008] The above-mentioned structure has piles,
It can be applied to a structure such as a pillar or a beam, but can also be applied on site, for example, to an existing structure. A stirrup bar is arranged so as to surround a plurality of main bars, a mold is arranged around this, and a hardening material is cast and hardened. A rust preventive metal plate is spirally wound around this hardened material to form a winding sheath. The stirrup muscles described above may be spiral or normal stirrups. In other words, this can be implemented even with existing columns and beams, and the existing structure is to be restrained by the newly wound winding sheath. Filling the gap between the hardened hardened material and the winding sheath with the hardened material further enhances the binding force.To fill the hardened material, apply the hardened material to the hardened material surface before winding the winding sheath, or Means for injecting pressure into the gap can be adopted. There is also a method in which an adhesive is applied to the inside of the winding sheath, and the sheath and the structure are integrated by winding the adhesive around the outer circumference of a pillar or a beam. As the hardener to be filled, various hardeners such as synthetic resin, polymer and cement can be adopted, and hardeners generally used as an adhesive are also included.

[0009]

[Function] The winding sheath restrains the inner hardened material to supplement the restraining effect of the stirrup muscle. The sheath does not peel off the stiffening material around the stirrup streaks. Therefore, the thickness of the cover can be reduced, and the stirrup streak can be positioned as close to the outer circumference as possible.
From these, almost the entire cross section of the structure can be calculated as the effective structure portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. An example is a case where the present invention is applied to a pile, and in FIGS. 1 and 2, reference numeral 1 is a main bar, and a plurality of them are arranged on a ring with appropriate intervals. These main lines 1
A spiral stirrup muscle 2 is arranged so as to surround it. Further, a cylindrical winding sheath 4 is provided so as to surround the circumference.
Is arranged. The winding sheath 4 is manufactured by spirally winding a stainless steel metal plate 3. In order to make it into a tubular shape, as shown in FIG. 3, at both ends of the metal plate 3, connecting portions 3a, 3b are formed which are bent in a hook shape so as to mesh with each other, and these connecting portions 3a, 3b are formed.
It is made into a continuous cylinder by engaging and crimping. The inside of the winding sheath 4 is filled with concrete 4 to manufacture a pile. The stripping of the concrete 5 is hindered by the winding sheath 4, whereby the fogging around the stirrup reinforcement 2 can be reduced, and the restraining effect of the stirrup reinforcement 2 can be given to almost the entire concrete 5. This makes the pile a structure with a large effective section.

FIG. 3 and FIG. 4 show an example in which the structure is a column which is an existing structure. In the column, a spiral stirrup bar 2 is arranged around a main bar 1 and arranged around it. It is constructed by placing concrete 5 in the formwork. Mortar 6 is applied around this, and a stainless metal plate 3 is wound around it. The metal plate 3 is the connection part 3 on both sides.
It is crimped by engaging a and 3b. By implementing the structure on the existing structure in this way, it is possible to prevent the concrete from peeling off from the existing structure and maintain the effective cross section of the structure as much as possible.

As shown in FIG. 5, the shaped steel 7 is arranged at the center of the structure, which can further increase the strength of the structure.

[0013]

The present invention has the above-mentioned structure and can obtain the following effects. Since the winding sheath prevents the peeling of the cover from the stirrup muscle, the stirrup muscle can be arranged as close to the peripheral edge of the structure as possible. Therefore, this stirrup streak can exert a restraining effect on almost all the hardened materials, resulting in a high-strength structure having a large effective section. The spiral stirrup streaks are integral with the entire length of the structure, and the load is received by the entire length of the structure. By using this, a structure having a great resistance to the load is provided. Since the spiral stirrup bar can easily select any diameter, thickness and pitch regardless of the steel manufacturing menu, it is convenient for designers and persons involved in construction work, which is economical. Will be increased. It is especially important for the design of the structure that the diameter, thickness, and pitch can be freely changed. This can be performed by winding the winding sheath around the existing structure as well as the structure newly manufactured at the factory or newly installed at the site, and it is possible to prevent the deterioration of the existing structure over time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pile embodying the present invention.

FIG. 2 is a perspective view of a manufacturing state of a pile.

FIG. 3 is a sectional view of a connecting portion of the winding sheath.

FIG. 4 is a partially cutaway perspective view of an existing pillar.

FIG. 5 is a cross-sectional view of an example other than the pile.

FIG. 6 is a cross-sectional view of a conventional structure.

FIG. 7 is a vertical cross-sectional view of a conventional structure.

[Explanation of symbols]

 1 Main bar 2 Stirrup bar 3 Metal plate 4 Winding sheath 5 Concrete 6 Mortar 7 Shaped steel

Claims (4)

[Claims] 1. A cylinder in which a spiral stirrup bar is arranged so as to surround a plurality of main bars arranged at appropriate intervals, and a rust preventive metal plate is spirally wound so as to surround the main bar. A high-strength structure in which a winding sheath that is continuous in a shape is arranged, and a hardening material is filled inside the winding sheath and cured. 2. A stirrup bar is arranged so as to surround a plurality of main bars that are arranged at appropriate intervals, and a stiffening material is placed in a mold arranged around the stirrup bars, and the stirrup bars are set around the stiffened bar. , A high-strength structure in which a winding sheath is formed by winding a rustproof metal plate in a spiral shape. 3. A spiral stirrup bar is arranged so as to surround a plurality of main bars arranged at appropriate intervals, and a stiffening material is cast in a mold arranged around this to stiffen the stirrup bar. A high-strength structure in which a tubular winding sheath is formed by spirally wrapping an anticorrosive metal plate around an object. 4. The high-strength structure according to claim 2, wherein the hardened material is filled between the hardened hardened material and the winding sheath.