JP2009102896A - Structure and method for electrical connection at connection part of precast concrete column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a construction period by simplifying a construction work at site and eliminate troublesome post construction works in a structure for electrical connection at the connection part of a precast concrete column when an electric path for a lightning conductor is secured in the structure. <P>SOLUTION: This structure 1 for electrical connection at the connection part of a precast concrete column 2 connected to the upper and lower stories is constructed to form an electric path for a lightning conductor. The structure comprises a conductive sleeve 4 fitted to the lower part of the lightning conductor reinforcement 3 of the precast concrete column 2 on the upper story, the lightning conductor reinforcement 3 on the upper story and a sleeve connection member 5, a screw part formed in the upper part of the lightning conductor reinforcement 3 on the lower story exposed to the upper side out of the upper surface of the column on the lower story, and a nut 7 screwed to the screw part and brought into contact with the lower surface of the sleeve of the precast concrete column 2 on the constructed upper story when tightened. The lightning conductor reinforcement 3 and the nut on the lower story and the sleeve and the lightning conductor reinforcement 3 are electrically connected to each other by these components. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrical connection structure in a PC column connection portion and a method for connecting the same in the case where a column reinforcing bar is used to provide a lightning rod in, for example, a super high-rise RC structure.

Conventionally, in a super high-rise building or a high-rise building, a lightning rod is provided on a rooftop or the like in order to avoid lightning damage. In order to ground the lightning rod to the ground, an energizing path for guiding the lightning conductor to the ground, for example, as shown in FIG. 6, a pipe such as vinyl chloride is buried inside a PC (precast concrete, the same applies hereinafter) pillar, It is installed outside the pillar. In recent years, focusing on the fact that there are column main bars of PC columns, the reinforcing bars of the upper and lower columns are electrically connected by filling conductive mortar or conductive concrete between the reinforcing bars in the method of joining the column main bars. There is known one in which an energization path is provided (see Patent Document 1). Further, as shown in FIG. 5, in the mortar filling type reinforcing bar joint in which the column main reinforcing bars 6 are connected by the sleeve 4 which is a mortar filling type joint, one end of the connecting wire 13 is connected to the column main reinforcing bar 6 via the connection fitting 14. The other end of the connection lead wire 13 is pulled out to the side of the PC pillar 2 and electrically connected, and is housed in the housing notch 15 between the upper and lower floor PC pillars 2 and 2 or in the joint mortar. It is known (see Patent Document 2).
Japanese Patent Laid-Open No. 2001-200657 Japanese Patent Application Laid-Open No. 08-291642

However, in the electrical connection structure and the connection method in the conventional PC column connection part, for example, according to the conductive mortar filling method, there is a difference depending on the construction in that the conductive mortar is uniformly filled. There is also a difference in the adhesion strength between the material and the reinforcing bar, and the energization path lacks certainty.
Moreover, in the mortar filling type reinforcing bar joint by the sleeve, it is necessary to bind the connecting conductors 13 to each floor, form a part 15 of the PC pillar 2 and embed it into the notch, which is troublesome. The construction period will be extended. The electrical connection structure and the connection method in the PC pillar connection part according to the present invention have been proposed to solve such problems.

  The gist for solving the above problems of the electrical connection structure in the PC column connection part according to the present invention to achieve the object is to form a current path for a lightning rod in a building in which a column is constructed with a precast concrete column. The electrical connection structure of the precast concrete column connecting portion between the upper floor and the lower floor includes a conductive sleeve fitted to a lower part of a lightning conductor reinforcing bar of the upper floor precast concrete column, and a lightning protection of the upper floor. In the connecting member for the sleeve that electrically connects the reinforcing bar for the conductor and the sleeve, and the reinforcing bar for the lightning conductor in the precast concrete column on the lower floor, it is screwed into the threaded part of the upper part of the reinforcing bar that protrudes upward from the upper surface of the column. And at least a nut that comes into contact with the lower surface of the sleeve of the precast concrete pillar on the upper floor that has been erected, Floor and lightning conductor reinforcing bar and reinforcing bar sleeve and lightning conductor of at least nut and upper floor is that it is electrically connected.

The sleeve connection member includes a connection fitting fixed to the lightning conductor reinforcing bar, a metal wire having one end connected to the connection fitting, and a metal fixing for fixing the other end of the metal wire to the surface of the sleeve. Comprising a member for use;
The metal fixing member is a metal band or a metal winding wire;
The connecting member for a sleeve is a nut screwed to a reinforcing bar for a lightning conductor, or a nut to be screwed and a washer to be loosely fitted;
Is included.

  The gist of the electrical connection method in the PC column connection part according to the present invention is that, when a precast concrete column is manufactured, a conductive sleeve is fitted to the lower end part in the vertical direction of the screw rebar, and the screw rebar is connected with the sleeve connection member. The sleeve is fixedly supported by a support means to be connected to the sleeve, and the upper end of the threaded reinforcing bar is disposed so as to protrude a desired length from the upper surface of the column, and then concrete is placed in the formwork. When the precast concrete column is built on site, at least a nut is placed on the upper part of the screw rebar protruding from the upper surface of the existing precast concrete column. The precast concrete for the upper floor is screwed into the existing precast concrete column. A column is inserted by fitting the upper part of the protruding screw rebar to the lower side of the sleeve, installed, and the nut is tightened to contact the lower surface of the sleeve. After the concrete column is adjusted, the continuity between the nut and the sleeve is appropriately checked, and the sleeve is filled with mortar.

  According to the electrical connection structure and the connection method in the PC pillar connection portion of the present invention, since no notch into the precast concrete pillar does not occur on each floor, repair work does not occur and the work period is shortened and labor can be saved. In addition, there is no connection work for conducting wires at the work site, and an energization path can be easily secured. Furthermore, since no post-construction work such as conductor installation occurs, the construction work is simplified and the construction period is shortened.

  As shown in FIGS. 1 (A) and 1 (B), an electrical connection structure 1 in a PC column connection part according to the present invention is a main structure in which a column is constructed with precast concrete (PC) columns 2 manufactured in advance in a factory. This is an electrical connection structure of a connection portion between the precast concrete columns 2 on the upper floor and the lower floor when forming a current-carrying path for a lightning rod in a super high-rise building.

  A part of the main bar in the PC pillar 2 is used as a lightening rod energization path, and the connection between the upper and lower floors of the energization path is facilitated. This electrical connection structure 1 electrically connects the conductive sleeve 4 fitted to the lower part of the lightning conductor reinforcing bar 3 of the PC pillar 2 on the upper floor, and the lightning conductor reinforcing bar 3 and the sleeve 4 on the upper floor. There is a connecting member 5 for the sleeve that connects to the sleeve.

  The lightning conductor rebar 3 is, for example, a screw joint having a required diameter. The other main reinforcing bars are different diameter reinforcing bars 6. The lightning conductor reinforcing bar 3 is used for fastening a nut 7 for tightening, which will be described later, to one end portion, and one or a plurality of the lightning conductor reinforcing bars 3 are prepared and embedded in the PC pillar 2.

  Then, in the lightning conductor reinforcing bar 3 in the precast concrete column 2 on the lower floor, a screw part carved in the upper part 3a of the reinforcing bar protruding upward from the upper surface 2a of the PC pillar 2 is screwed to the screw part. The electrical structure 1 is composed of a nut 7 and a washer 8 that come into contact with each other by being tightened to the lower surface of the sleeve 4 of the upper PC column 2 installed in the cage. The lower lightning conductor reinforcing bar 3, the nut 7 and the washer 8 are electrically connected to the upper floor sleeve 4 and the lightning conductor reinforcing bar 3.

  As shown in FIG. 1A, a specific configuration of the sleeve connection member 5 includes a plate-shaped connection fitting 9 fixed to the lightning conductor rebar 3 and a required width, and one end on the connection fitting 9. The metal wire 10 such as a copper wire connected to the portion 10a and the other end portion 10b of the metal wire 10 are fixed to the surface of the sleeve 4, for example, a copper wire, a copper plate band, solder, a copper wire connection fitting, etc. It is comprised with the metal fixing member 11 which is a metal band or a metal winding wire.

  The electrical connection structure 1 of the PC pillar 2 according to the present invention is configured as described above, and the connection method will be described with reference to FIGS. First, when the precast concrete column 2 is manufactured in the factory, the conductive sleeve 4 is fitted to the lower end portion 3b in the vertical direction of the screw joint bar 3, and this sleeve 4 is placed in the mold for the PC column 2, For example, the supporting means is fixed by a wire or the like by spacers or hoops 6a.

  The sleeve connecting member 5 makes the screw rebar 3 and the sleeve 4 conductive. The upper end portion 3a of the screw rebar 3 is disposed so as to protrude a desired length from the upper surface 2a of the PC pillar 2, and then concrete is placed in the mold. In this way, the PC pillar 2 is formed by being buried as the lightning conductor reinforcing bar 3.

  When the PC pillar 2 is erected on site, as shown in FIG. 3, a nut 7 is screwed onto the reinforcing bar upper portion 3 a of the threaded reinforcing bar 3 protruding from the upper surface 2 a of the existing PC pillar 2, thereby providing a washer 8. Is fitted. Next, the above-mentioned PC pillar 2 for the upper floor is inserted into the existing PC pillar 2 by fitting the reinforcing bar upper part 3a of the protruding screw reinforcing bar 3 to the lower side of the sleeve 4 and inserting it. . Thereafter, a wrench, for example, is inserted into the lower space (about 10 mm) of the PC pillar 2 on the upper floor, and the nut 7 is tightened and brought into contact with the lower surface of the sleeve 4 together with the washer 8.

  For example, a temporary fixing camber or a precision adjusting copy (oblique support) is used to adjust the erected PC column 2 on the upper floor. Thereafter, the conduction between the nut 7 and the washer 8 and the sleeve 4 is confirmed as appropriate, and the mortar 12 is filled from the inlet 4 a of the sleeve 4. It can be seen that the mortar 12 is filled in the sleeve 4 because the mortar 12 overflows from the discharge port 4b.

  In this way, a current-carrying path during a lightning strike is secured by the lightning conductor reinforcing bar. Since the screw joints 3 and the sleeve 4 are embedded in the PC column 2 in advance, there is no need to draw out the connection outside the PC column 2 and there is no subsequent backfilling work with mortar. Therefore, the lightning rod energization path can be easily constructed, and the construction period can be shortened.

  As a second embodiment of the present invention, as shown in FIG. 4, the sleeve connecting member 5 includes a nut 7 that is screwed into the lightning conductor reinforcing bar 3, or a nut 7 that is screwed together and a washer that is loosely fitted. 8 is configured. In this way, after the sleeve 4 is fixed to the reinforcing bar or the like, the washer 8 is loosely fitted to the reinforcing bar 3 in advance to the required upper position, and the nut 7 is screwed together. The nut 7 is tightened and the nut 7 is tightened.

They are the enlarged detailed view (A) which shows the electrical connection structure 1 in the PC pillar connection part which concerns on this invention, and a whole conceptual diagram (B). It is explanatory drawing explaining the electrical connection connection method in the PC pillar connection part of the same this invention. It is explanatory drawing explaining the electrical connection connection method in the PC pillar connection part of the same invention in the order of erection. It is a partially expanded front view which shows 2nd Example of this invention. It is explanatory drawing which shows the electrical connection structure in the PC pillar connection part which concerns on a prior art example. It is an explanatory pillar cross-sectional view which shows the mode of installation of the electricity supply path | route in PC pillar of the prior art example.

Explanation of symbols

1 Electrical connection structure at the PC pillar connection,
2 PC pillars,
3 Rebar for lightning conductor (screw joint rebar), 3a Rebar upper part,
3b lower end,
4 sleeve, 4a inlet,
4b outlet,
5 Connection member for sleeve,
6 Reinforcing bars, 6a Hoops,
7 nuts,
8 Washers,
9 Connection bracket,
10 metal wire, 10a one end,
10b the other end,
11 Metal fixing member,
12 mortar,
13 Copper wire,
14 Connection fittings,
15 The body is missing.

Claims (5)

The electrical connection structure of the precast concrete column connection portion between the upper floor and the lower floor when forming a current-carrying path for a lightning rod in a building constructed with a precast concrete column,
A conductive sleeve fitted to the lower part of the lightning conductor reinforcing bar of the upper floor precast concrete pillar, and a sleeve connecting member for electrically connecting the upper lightning conductor reinforcing bar and the sleeve;
The lightning conductor reinforcing bar in the precast concrete column on the lower floor is screwed to the threaded part of the upper part of the reinforcing bar that protrudes upward from the upper surface of the column, and is tightened to the lower surface of the sleeve of the precast concrete column in the upper floor With at least the nut that comes into contact with
The lower floor lightning conductor reinforcing bar and at least the nut, the upper floor sleeve and the lightning conductor reinforcing bar are electrically connected,
The electrical connection structure in the PC pillar connection part characterized by this. The connection member for the sleeve includes a connection fitting fixed to the reinforcing bar for the lightning conductor, a metal wire having one end connected to the connection fitting, a metal fixing member for fixing the other end of the metal wire to the surface of the sleeve, Consisting of,
The electrical connection structure in the PC pillar connection part according to claim 1. The metal fixing member is a metal band or a metal winding wire,
The electrical connection structure in the PC pillar connection part according to claim 2. The sleeve connection member is a nut that is screwed to the lightning conductor reinforcing bar, or a nut that is screwed and a washer that is loosely fitted,
The electrical connection structure in the PC pillar connection part according to claim 1. When manufacturing precast concrete columns, fit a conductive sleeve to the lower end in the vertical direction of the screw rebar,
The sleeve connection member is used to connect the screw rebar to the sleeve, and the support means fixes and supports the sleeve, and the upper end portion of the screw rebar is arranged to protrude from the upper surface of the column to a desired length. After that, cast concrete in the formwork and embed it as lightning conductor reinforcing bars to form precast concrete columns,
When building the precast concrete pillar on-site, at least a nut is screwed onto the upper part of the threaded reinforcing bar protruding from the upper surface of the existing precast concrete pillar,
The precast concrete column for the upper floor is inserted into the existing precast concrete column by fitting the upper part of the protruding screw rebar to the lower side of the sleeve, and erected.
Tighten the nut to contact the lower surface of the sleeve,
After erection adjustment of the precast concrete pillar on the upper floor that has been erected,
Check the conduction between the nut and the sleeve as appropriate, and fill the sleeve with mortar,
The electrical connection method in the PC pillar connection part characterized by these.

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