JP4774334B2 - Reinforcing bar connection structure and connecting bracket - Google Patents

Description

  The present invention relates to a reinforcing bar connecting structure for connecting reinforcing bars at a construction site of a concrete structure and a fitting for connecting the reinforcing bars.

For example, as shown in Patent Documents 1 and 2 below, the reinforcing bars of a concrete structure are generally joined by gas pressure welding where the ends are butted together at a construction site and heated by a gas burner. The work required equipment such as a gas burner and skilled workers.
Moreover, although the following patent documents 3-5 show the structure which connects a reinforcing bar using various connecting tools and its connecting tools, none was able to connect a reinforcing bar with the expected tensile strength. .
Moreover, although the joining metal fitting shown by the following patent document 6 was what engaged the inner surface of a vertically-divided connection cylinder body with the protrusion formed in the surface of a deformed steel bar, the crack and protrusion of a connection cylinder body There was a possibility that the strength might be impaired depending on the formation state of.
In addition, it was considered that the thread groove was processed at the end of the opposing reinforcing bar and connected by screwing the turnbuckle (long nut), but the troublesomeness of having to form the thread groove at the construction site, Depending on the strength of the thread groove, there was a risk that sufficient strength could not be obtained.
JP 2005-224856 A JP 2003-119897 A JP-A-8-177168 Japanese Patent Laid-Open No. 7-90986 JP 7-158279 A Japanese Patent Laid-Open No. 9-79231

  Therefore, the present invention aims to provide a reinforcing bar connecting structure and a fitting for connecting which can solve the above-mentioned drawbacks and can connect the reinforcing bars with a sufficient connection strength in a field work.

For this purpose, the reinforcing bar connecting structure according to the present invention is such that a screw hole is formed in the central transverse portion, and a through-hole is opened on both sides of the screw hole, and a bolt is screwed and fastened to the screw hole. And a holding part that is assembled so as to cover both of the through holes, and a bent part whose tip is opened by bending the ends of the two reinforcing bars to be connected to a right angle or an angle of a right angle or more. The bent portion is inserted into both through-holes of the connecting metal body, the presser fitting is assembled to the connecting metal body, and the bent part is sandwiched between the presser metal and the connecting metal body. Thus, the bent portion is prevented from coming off from the through hole .
Further, in the reinforcing bar connecting structure according to the present invention, standing walls are integrally projected on both sides of both through holes in the coupling metal body, and the reinforcing bars are arranged between the both standing walls, and the presser The metal fitting is formed to have a width that fits between the two standing walls .

  Construction on site is simple, and the reinforcing bars can be connected with a strong connection strength. Therefore, there is a remarkable effect of improving the strength of the concrete structure using the reinforcing bars as the core material.

  FIG. 1 is an exploded perspective view of a connection fitting and a reinforcing bar according to the present invention, and FIG. 2 is a plan view of the connection fitting main body. In the figure, 1 is a connecting metal fitting body, 2 is a holding metal fitting, 3 is a bolt, and 4 and 5 are two reinforcing bars to be connected. The connecting metal fitting body 1 is formed, for example, by casting, and is formed into a substantially plane shape having a pair of through holes 1b and 1c that are adjacent to each other across the central transverse portion 1a. A screw hole 1d is formed. Reference numerals 1e and 1f denote standing walls that protrude from the surface of the connecting metal fitting body 1 on both sides of the through holes 1b and 1c. The presser fitting 2 is formed to have a width that fits between the upright walls 1e and 1f, and a through hole 2a through which the bolt 3 can pass is formed at the center. The lower surfaces of both end portions 2b and 2c are formed in a circular arc shape along outer peripheral surfaces of bent portions 4a and 5a of reinforcing bars 4 and 5 which will be described later. The presser fitting 2 is made to be a solid one by casting, for example, in the same manner as the coupling metal body 1.

  The ends of the reinforcing bars 4 and 5 to be connected are bent at a right angle or an angle equal to or higher than the right angle to form the bent portions 4a and 5a, and as shown in FIGS. 3 and 4, the bent portions 4a and 5a. Are inserted into the through holes 1b and 1c of the connecting metal fitting body 1, respectively. Then, by inserting the bolt 3 into the through hole 2a of the presser fitting 2 and screwing the bolt 3 into the screw hole 1d, the both end portions 2b, 2c of the presser fitting 2 are located above the through holes 1b, 1c. Since both end portions 2b and 2c press the bent portions 4a and 5a of both reinforcing bars 4 and 5, the presser fitting 2 has the bent portions 4a and 5a formed in the through holes 1b and 2b. It serves as a retaining means for preventing it from coming off from 1c.

  When bending the ends of the reinforcing bars 4 and 5, a well-known bending machine, which is an indispensable tool for bar arrangement work at the construction site, can be used as it is. In addition, it is easy for any person without the need for skill, and it is possible to work reliably without causing a bonding failure, and the construction becomes easy.

  Thus, since both the reinforcing bars 4 and 5 are connected by penetrating the bent portions 4a and 5a into the through holes 1b and 1c of the connecting metal fitting body 1, even if both reinforcing bars 4 and 5 are pulled strongly. Or, even if a compressive force is applied, both the reinforcing bars 4 and 5 can be kept connected without being detached. Moreover, when both ends 2b and 2c of the presser fitting 2 press the bent portions 4a and 5a, the bent portions 4a and 5a do not extend even when a strong tensile force is applied to both the reinforcing bars 4 and 5. The bent portion is held at a right angle or an angle equal to or greater than a right angle, and the connected state is maintained.

Further, the upright wall 1e to connecting fitting body 1, 1f are inserted through is formed integrally with the bent portion 4a, a 5a through hole 1b, and 1c are arranged reinforcing bars 4, 5 on both standing walls Thus, the straight stretchability of the connected rebars 4 and 5 is maintained, and a strong resistance against a bending force acting from the outside can be obtained.
For this reason, according to the reinforcing bar connecting structure of the present invention, since the construction is simple and the reinforcing bars can be firmly connected, there are remarkable effects such as improving the strength of the concrete structure using the reinforcing bars as the core material.

The disassembled perspective view of the metal fitting for connection which is embodiment of this invention, and a reinforcing bar. The top view of the connection metal fitting main body shown in FIG. The perspective view which showed the connection state of the metal fitting for connection which is embodiment of this invention, and the reinforcing bar. The longitudinal cross-sectional view of the metal fitting for connection of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection metal fitting body 1a Center crossing part 1b, 1c Through hole 1d Screw hole 1e, 1f Standing wall 2 Holding metal 2a Through hole 2b, 2c Both ends 3 Bolt 4, 5 Reinforcing bar 4a, 5a Bending part

Claims (2)

A coupling metal body having a screw hole formed in the central transverse portion, and a through hole opened on both sides of the screw hole, and a bolt bolted into the screw hole so as to cover both the through holes. A holding fitting that is assembled is formed, and a bent portion having an open end is formed by bending the ends of two reinforcing bars to be connected at a right angle or an angle equal to or more than a right angle, and the bent portion is connected to the connecting fitting. The through-holes of the main body are respectively inserted into the through-holes, the presser fittings are assembled to the connecting metal fittings body, and the bent parts are sandwiched from the through-holes by sandwiching the bent parts between the holding metal fittings and the main body of the connecting metal fittings. Reinforcing bar connection structure characterized by being designed to prevent it from coming off . Standing walls are integrally protruded on both sides of both through-holes in the coupling metal body, and the reinforcing bars are arranged between the both standing walls, and the presser fitting has a width that fits between the two standing walls. The reinforcing bar connecting structure according to claim 1, wherein the reinforcing bar connecting structure is formed.

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