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Reinforcing bar joint

a technology of reinforcing bars and joints, applied in the direction of building reinforcements, constructions, building components, etc., can solve the problems of increasing the diameter of the bar, the insufficient versatility of the bar pitch, and the difficulty in performing various bar arrangements or secure overlapping lengths, so as to reduce the bending deformation, and increase the distance between the points of action of the tensile forces acting on the reinforcing bars

Inactive Publication Date: 2010-02-04
OKABE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]As a result, the reinforcing bars may suffer a bending moment which does not occur when undergoing tensile forces alone. The sleeve rotation can also subject the opening edges of the sleeve to some of the tensile forces acting on the reinforcing bars, thereby causing a split in the sleeve.
[0029]For example, sleeve specifications such as the sectional shape, length, and hardness of the sleeve may be determined arbitrarily. When the sleeve is given a hardness relatively lower than those of the first and second reinforcing bars, it is possible to avoid a splitting fracture of the sleeve, a pulling out of the reinforcing bars from the sleeve and a wedge break of the reinforcing bars, thereby allowing base-material fracture of the reinforcing bars without fail.

Problems solved by technology

Since two reinforcing bars must be overlapped, it becomes harder to perform various bar arrangements or secure overlapping lengths of such as the bar diameter increases.
Among those methods, one method for joining pairs of mutually parallel reinforcing bars is applicable only to reinforcing bars having fixed spacings, and thus is not sufficiently versatile in terms of bar pitch (see Patent Document 5).

Method used

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Examples

Experimental program
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Effect test

example 1

[0074]Table 1 shows the results of a tensile test. The tensile test used reinforcing bars of steel type SD345 (concrete reinforcing steel rod, Japanese Industrial Standard, specification values of 345 N / mm2 in yield point and 490 N / mm2 in tensile strength), having a diameter of D22 (nominal cross-sectional area of 387.1 mm2). In the cases where two holes were provided, the holes were spaced 50 mm apart. The same holds for the tests to be described hereinafter.

[0075][Table 1]

TABLE 1SleeveTest resultYieldTensileThick-NumberSectionalYieldMaximumMaximumpointstrengthLengthnessofareastrengthstrengthtensileTestSteelsσysσusLstholessAsPysPustrengthpiecetype(N / mm2)(N / mm2)(mm)(mm)sn(mm2)(kN)(kN)(kN)Final condition1STKM2153701004.02586.1126.0216.9180.0Split213A1501157.5Pulling out32225.0Base-material fracture410010.021599.6343.9591.8224.0Base-material fracture5S45C3255101005.01719.4233.8366.9175.4Pulling out62208.4Base-material fracture71004.52654.5212.7333.8176.2Split Wedge break204.681202216....

example 2

[0084]Table 2 shows the results of another tensile test. In the table, pulling out refers to a shear fracture of a reinforcing bar at a position where a wedge member bites into (an area of, chipped section). A split refers to a splitting fracture of a sleeve end in contact with a reinforcing bar. A wedge break refers to a breakage of a reinforcing bar at a position where a wedge member bites into (an area of chipped section).

[0085]The tensile test used reinforcing bars of steel type SD390 (concrete reinforcing steel rod, Japanese Industrial Standard, specification values of 390 N / mm2 in yield point and 560 N / mm2 in tensile strength), having a diameter of D22. If a test result included variations, the plurality of results is shown in the “test result” field.

[0086][Table 2]

TABLE 2SleeveTensileTensilestrengthstrengthNumberTestSteel(spec)(material)LengthThicknessofExperimental tensile strengthpiecetype(N / mm2)(N / mm2)(mm)(mm)holesTest resultMaterial tensile strength9S45C510679.41004.532We...

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Abstract

A reinforcing bar joint 1 includes a sleeve 2 having an elliptic section, and a wedging means 4. The wedging means 4 is composed of wedge members 4a, 4b which are pressed into between reinforcing bars 5a, 5b. The press-in positions of these wedge members 4a, 4b are spaced away from each other so that the reinforcing bars 5a, 5b, the sleeve 2, and the wedge members 4a, 4b are integrated in the area lying between the press-in positions. This can also move the points of action of tensile forces acting on the reinforcing bars outward, thereby increasing the distance between the points of action and reducing the amount of rotation of the sleeve 2.

Description

TECHNICAL FIELD[0001]The present invention relates to a reinforcing bar joint to be applied when joining reinforcing bars together.BACKGROUND ART[0002]Reinforcing bars are main components of reinforced concrete structures (RC structures) and steel-reinforced concrete structures (SRC structures), and are cut in predetermined lengths so as to be arranged easily during configuration on-site. The operation for joining the reinforcing bars on-site is thus indispensable.[0003]There are various types of methods for joining reinforcing bars, including a lap joint, a mechanical coupler, and a gas-pressure welding joint. These joints are selected and used as appropriate depending on the quality required of a structure, working conditions, the diameters of the reinforcing bars being used, and the like.[0004]In this instance, the joining methods mentioned above have respective drawbacks and advantages. For example, a lap joint can join reinforcing bars easily by utilizing the bar's adhesion to ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04C5/18
CPCE04C5/165E04C5/163
Inventor MURAYAMA, SATOSHIYOSHIDA, MITSUHIROHIRAYAMA, TAKAAKIKURIHARA, YOSHITAKA
Owner OKABE CO LTD
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