JP3172964B2 - Connection method for connection to steel in concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion device installed to prevent corrosion of steel in concrete and a steel material for a potential measuring instrument installed to grasp the corrosion and anticorrosion state of the steel. To a connection method for connection to a computer.

2. Description of the Related Art In recent years, there has been a problem that steel in a reinforced concrete structure is corroded due to intrusion of salt or sea salt particles contained in fine aggregate. As a countermeasure against corrosion, a method in which a metal spray coating having a lower potential than steel is adhered to the surface of the concrete structure, a positive electrode of a DC power supply is connected to the metal spray coating, and a negative electrode is connected to the steel to flow a DC current, A linear electrode or a mesh electrode made of platinum-coated titanium is attached inside the surface of the concrete structure, and the positive electrode of a DC power supply device is connected to the electrode, and the negative electrode is connected to a steel material by a conductive wire, and a DC current is applied to perform electrolytic protection. The method has been adopted. In addition, as a method of grasping the corrosion state of steel in concrete and checking the anticorrosion effect, a method of pressing a potential sensor against the concrete surface and measuring the potential difference between the steel material in concrete and the potential sensor using a potentiometer is adopted. The steel wire in the concrete is connected to the conductor. Conventionally, when a conductor is electrically connected to a steel material in concrete, as shown in FIG. 4, the concrete 1 is stretched to a depth at which the reinforcing bar 2 is exposed, and a flat steel bar provided with a hole for connecting the conductor at the tip is provided. The round bar 5 is welded to the other end of the round bar 12, the end of the round bar 5 is welded to the exposed reinforcing bar 2, and the crimp terminal 6 is attached to the hole of the flat bar 12 using a bolt and nut 13. 5 or a method of welding the side surface of the round steel 5 to which the conductor 8 has been attached at one end in advance to the reinforcing bar 2 as shown in FIG. The hanging hole is backfilled with concrete 7.

The above prior arts have the following problems. That is, in the method of FIG. 4, since the concrete cover thickness of the reinforcing bar 2 is not uniform, the round bar 5 is adjusted to the concrete cover thickness of the reinforcing bar 2 so that the hole of the flat bar 4 is not embedded in the concrete 7.
It is difficult to uniformly repair the suspended portion even if the round bar 5 is cut and welded once according to the concrete cover thickness of the reinforcing bar 2. Therefore, the position of the hole of the flat steel 4 may be too close to the repaired concrete 7 or may be unnecessarily separated, which may require a skilled worker to repair the concrete backfill. Was. Further, in the method of FIG. 5, since the conductor 8 attached to the round steel 5 is embedded in the concrete 7, there is a drawback in that if the conductor 8 is broken in the concrete 7, such as disconnection, repair becomes difficult. Was. The present invention has been made in view of such problems of the related art, and the object thereof is to:
At the time of connection, the connection level of the conductor 8 can be adjusted freely even after backfilling the concrete 7 without any special skill and in the concrete where the conductor 8 can be connected without being buried in the concrete 7. It is intended to provide a method for connecting to a steel material.

In order to achieve the above-mentioned object, the present invention provides a method for connecting wires, comprising the steps of: providing a base metal end of a long metal fitting in which a fastening metal fixing portion is continuously provided in a steel material in concrete in a longitudinal direction. Is welded, and the end of the conductive wire is fixed to an arbitrary level position protruding from a hanging hole of the long metal fitting via the fastening metal.

[Function] A fastening fitting can be attached to an arbitrary level position of a long fitting protruding from a hanging hole in concrete. Thus, the conducting wire fixed via the fastener can be connected to a normal level before and after backfilling of concrete. Also, of course, the conductor is not buried in the backfill concrete, which is advantageous.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment will be described with reference to the drawings. FIG. 1 shows a nut 3 which is formed by welding a metal fitting 3 made of a bolt having a full length threaded to a reinforcing bar 2 in concrete 1 and screwing the screw. 4 'shows an embodiment of the present invention in which the crimp terminal 6 with the conductive wire 8 is fixed to the metal fitting 3 at 4'. In addition, the metal fitting 3 may be one obtained by threading one end of a round steel. Since the screws are machined over the entire length, the conductors 8 can be connected to the exposed portions of the metal fittings 3 at any positions of the exposed portions of the metal fittings 3 by the nuts 4 and 4 'and the crimping terminals 6. The conductor 8 can be connected to the metal fitting 3 at an appropriate level from the concrete surface even if it does not match the original concrete one surface. If the metal fitting 3 is too long, the crimp terminal 6 with the conducting wire 8 may be fixed to the metal fitting 3 with the nuts 4 and 4 ', and then cut to an appropriate length. It can be freely changed and does not require any skill. FIG. 2 shows an end of a metal fitting 3 'made of flat steel with a plurality of bolt holes 9 in a row, welded to a reinforcing bar 2 in concrete 1, and a crimp terminal 6 with a conducting wire 8 with bolts and nuts 10. Is shown in another embodiment of the present invention in which is fixed to a metal fitting 3 '. The conductor 8 can be connected by the bolts and nuts 10 and the crimp terminals 6 using any of the holes 9 in the part of the metal fitting 3 exposed from the concrete 7, so that the concrete 7 in the repaired part of the hanging part is the same as the original concrete one surface. Even if they do not match, the conductor 8 can be connected to the metal fitting 3 at an appropriate level from the concrete surface. It is to be noted that, when the metal fitting 3 is too long, it is sufficient to cut it at an appropriate length, as in FIG. The same applies to freely changeable arrangements. FIG. 3 shows a metal fitting 3 "made of flat steel with a slot 11 for bolt insertion.
Is welded to reinforcing bar 2 in concrete 1 and bolts
Another embodiment of the present invention is shown in which the crimp terminal 6 with the conducting wire 8 is fixed to the metal fitting 3 "with the nut 10. The bolt and nut 10 and Since the conductor 8 can be connected with the crimp terminal 6, the concrete is used as the concrete 7 at the repaired portion of the hanging portion.
The conductor 8 can be connected to the metal fitting 3 at an appropriate level from the concrete surface even if the wire does not coincide with the original concrete surface. In addition, when the metal fitting 3 is too long, what is necessary is just to cut the metal fitting 3 by an appropriate length, and it is possible to change the arrangement freely, as shown in FIGS.
The same is true.

Since the present invention is configured as described above, it has the following effects. Since the conducting wire can be attached to an arbitrary position on the exposed portion of the concrete surface of the metal fitting fixed to the steel material in the concrete, it is not necessary to cut and weld the metal fitting according to the concrete cover thickness of the steel material as in the related art. In addition, even if the repair of the hanging part is not uniform, the mounting position of the fixture may be too close to the repaired concrete and hinder the installation of the conductor, or the conductor may be unnecessarily separated and the conductor may become unstable. There is no need for skilled workers to repair concrete. Further, since the conductor is not embedded in the concrete, even if the conductor has a trouble such as disconnection, it can be easily repaired.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a connection method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a connection method according to another embodiment of the present invention.

FIG. 3 is a diagram showing a connection method according to another embodiment of the present invention.

FIG. 4 is a view showing a conventional connection method.

FIG. 5 is a view showing another conventional connection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete 2 Reinforcing bar 3, 3 ', 3 "metal fitting 4, 4' nut 5 Round steel 6 Crimp terminal 7 Concrete 8 Conductor wire 9 Bolt insertion hole 10 Bolt and nut 11 Bolt insertion long hole 12 Flat steel 13 Bolt and nut

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C23F 13/00-13/22 E02D 31/06

Claims (4)

(57) [Claims] 1. A base end of a long metal fitting having a fastening metal fixing portion continuously secured in a longitudinal direction to a steel material in concrete, and a lead end portion of the long metal fitting is connected to the long metal fitting through the fastening metal. A method of connecting to steel in concrete, characterized in that it is fixed at an arbitrary level protruding from a hanging hole. 2. The method for connecting to a steel material in concrete according to claim 1, wherein the long metal fitting is a screw steel rod and the fastening metal fitting is a pair of nuts. 3. The method according to claim 1, wherein the long metal fitting is a flat steel having a plurality of row-shaped bolt insertion holes, and the fastening metal fittings are bolts and nuts. 4. The method according to claim 1, wherein the long metal fitting is a flat steel having a long hole for inserting a bolt, and the fastening metal fitting is a bolt and a nut.