JP5260437B2 - Equipotential and structural grounding mechanism of important rooms in buildings - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart shielding effects to an electromagnetic field generated in a thunder current flowing in a building structure and to prevent indoor equipment from being greatly influenced by a potential difference generated between upper and lower floor slabs caused by a thunder current. <P>SOLUTION: In the equipotentiality of an important room in a building and a structure grounding mechanism, a metal body 6 is buried in a floor slab 1, and is connected electrically to a reinforcement 5 arranged in a mesh state with a connection line 7. A partition wall 3 has a backing light-weight steel frame 9 in a mesh structure, and the backing light-weight steel frame is electrically connected to the metal body with a fixing pin 8 driven into the metal body from a lower side runner 10, and grounded to the reinforcement of the floor slab through the connection line, thereby performing insulation while interposing an insulating material 13 between a partition wall, upper floor slab 2 and a stud 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention reduces the influence on equipment installed in an important room, such as a hospital operating room or office server room, during a lightning strike to a building such as a reinforced concrete structure or a steel structure building. For the equipotential and structure grounding mechanism.

  During a lightning strike to a building such as a reinforced concrete structure or a steel structure building, lightning current flows through the building as pillars, beams, floors, and the like. Even in a lightning strike to one part of a building such as a lightning rod, the lightning current flows while diffusing throughout the building, so that a shunt component of the lightning current also flows in the beams and floors which are lateral members of the building structure.

  The electromagnetic field generated by such lightning currents affects equipment installed in the room, but it affects equipment installed in critical rooms such as hospital operating rooms and office server rooms. May cause a great deal of damage such as loss of recorded data by a magnetic recording medium such as a magnetic disk or a magnetic tape, malfunction of a device, or system down.

Examples of conventional techniques for reducing the effects of lightning strikes on buildings include those shown in the following documents.
First, in Patent Document 1, the ceiling, partition walls, and floor as interior members of an important room are insulated from the building structure, and the metal part and electrical equipment of the important room are grounded to the building structure through a ground wire at one point. The configuration is described.

  In such a configuration, there is a potential difference between the building structure that is the lightning current path and the interior members of the critical room during lightning strikes. It is necessary to insulate from the interior member, but lightning current is high frequency, and even a member with high insulation performance generates electromagnetic induction across it, so it may be separated by distance for insulation is necessary. However, determination of such a separation distance requires advanced analysis, and it is practically difficult to secure a separation space.

  Next, in Patent Document 2, a cable extraction bolt for connecting a grounding cable to a deck plate, a reinforcing bar or a mesh bar constituting the floor slab is erected with its threaded portion facing upward, and this cable. It describes a device that requires grounding and a slab structure housing that can be connected to the indoor floor by a very short length of grounding cable in a configuration in which a grounding cable connection hardware is fixed to an extraction bolt.

  Furthermore, in Patent Document 3, in a floor slab having a deck plate and a grid-shaped main bar disposed above the deck plate, a horizontal bolt portion of a T-shaped suspension bolt is connected and fixed to the main bar. In addition, the vertical bolt part is suspended downward through the deck plate, and a cable rack in which a grounding cable is connected to the vertical bolt part is fixed, and thus equipment requiring grounding is connected to the grounding cable on the indoor ceiling side. The frame grounding structure that can be connected to the upper floor slab is described.

  The above two patent documents only disclose a technique for grounding the floor slab on the indoor floor side and the ceiling side, respectively, and an electromagnetic field generated by a lightning current flowing through the building structure during a lightning strike. No technical means for shielding the interior from the interior are described.

  In addition, when grounding is performed according to the configuration described in the above two patent documents, a potential difference due to the progress of lightning current along the building structure is generated on the upper and lower floors. Although it is necessary to unify it to one of the upper floor slabs and it is very difficult in practice, the solution is not shown in two patent documents.

JP 2005-273328 A JP 2004-183426 A JP 2005-56594 A

  The problem to be solved by the present invention is that, in the prior art, there is no shielding effect against the electromagnetic field generated by the lightning current flowing in the building structure and the potential difference generated between the upper and lower floor slabs by the lightning current. It has a great influence on the equipment.

  In order to solve the above-described problems, in the present invention, in the building structure body, an important room surrounded by a partition wall is configured. In the floor slab, a metal body is embedded corresponding to the installation position of the partition wall. The metal body is electrically connected to the reinforcing bars arranged in a mesh shape by connecting wires, and the partition wall has a mesh structure of a lightweight steel frame for groundwork. Electrical connection is made to the metal body by means of conductive fixing pins driven into the metal body in the side runner, and grounded to the reinforcing bar of the floor slab via the connection line, the partition wall, and the floor slab of the upper floor We propose an equipotential and structural grounding mechanism for important rooms in buildings where insulation is interposed between the pillars and insulation.

  Moreover, in this invention, in said structure, it proposes insulating by interposing an insulating material between a part of lower runner of a partition wall, and a floor slab.

  In the present invention, in the space of the building structure that constitutes an important room surrounded by the partition wall, the floor slab is embedded with a metal body corresponding to the installation position of the partition wall, from this metal body, It is configured to electrically connect to the reinforcing bars arranged in a mesh shape by connecting wires, and the partition wall is made of a lightweight steel frame for groundwork with a mesh structure and fixed between the floor slab and the upper floor slab via a runner This lightweight steel frame for the base is supported by a fixed spacer, and is fixed to the floor slab by means of a conductive fixing pin driven into the metal body in the lower runner through the metal body and the connecting wire. An important room in a building in which an electrical connection is made to the metal body by a working pin, grounded to the reinforcing bar of the floor slab via the connecting wire, and an insulating material is interposed between the upper runner of the stud and the floor slab of the upper floor Etc. To propose a position and structure ground mechanism.

  In the present invention, in the latter configuration, the important room is provided with an interior ceiling having a lightweight steel frame for the groundwork in the mesh structure at a distance from the floor slab and the pillar on the upper floor, and the lightweight steel frame for the groundwork of the interior ceiling and the partition wall This paper proposes equipotential and structural grounding mechanisms for important rooms in buildings that are electrically connected.

  According to the present invention, the reinforcing bars arranged in a mesh shape of a floor slab as a building structure, the lightweight steel frame for the ground structure of the partition wall constituting the important room, and the interior ceiling having the lightweight steel frame for the ground structure of the mesh structure An electromagnetic shield structure can be configured to reduce the electromagnetic field pulses generated in the important room due to lightning strikes.

  Insulation is performed between the partition wall and the floor slabs and columns on the upper floor to insulate the potential of the important room at the location where the potential fluctuation of the floor is small. The grounding of the lightweight steel frame with the mesh structure for electromagnetic shielding is possible at the same location.

  The lightweight steel frame for the base of the partition wall and the reinforcing bar of the floor slab can be connected at the same time by driving a conductive fixing pin into the metal body embedded in the floor slab from the lower runner when constructing the partition wall. Construction work and grounding work that is electrical work can be performed simultaneously.

In this way, in the present invention, the equipotential surface is made of a mesh rebar of the floor slab, and the interior member of the important room is made equipotential, and the metal body in the important chamber, the panel, and the ground for the power source are connected to the equipotential surface. This can be done easily, thus preventing damage or malfunction of the device during a lightning strike.
The electromagnetic field generated by the lightning current that flows through the floor slab as a building structure varies depending on the location.Therefore, the location of the floor slab where the generation of the electromagnetic field is assumed to be large and a part of the lower runner of the partition wall If an insulating material is interposed between the two, the influence of the electromagnetic field from the floor slab can be further reduced.

  In the present invention, the partition wall is supported by a spacer fixed between the floor slab and the upper floor slab via a runner, and an insulating material is interposed between the upper runner of the pillar and the upper floor slab. With this configuration, the partition wall of the important room is equipotential with the floor slab, and is insulated from the upper floor slab having a different potential, so that no current that causes an electromagnetic field is generated.

  And by providing an interior ceiling with a lightweight steel frame with a mesh structure at a distance from the upper floor slab and the pillar, electromagnetic coupling with the upper floor slab, which occurs when the distance is short, can be suppressed. By electrically connecting the interior lightweight ceiling and the lightweight steel frame for the partition wall, it is possible to provide an effective electromagnetic shield against the electromagnetic field generated by the lightning current flowing through the floor slab on the upper floor.

FIG. 1 is a schematic cross-sectional view showing an embodiment of an equipotential of an important room and a structure grounding mechanism in a building of the present invention. FIG. 2 is a schematic cross-sectional view of an embodiment of an equipotential of an important room and a structure grounding mechanism in a building according to the present invention as viewed from a direction different from FIG. FIG. 3 is a schematic cross-sectional view showing another embodiment of the equipotential of the important room and the structure grounding mechanism in the building of the present invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
In the embodiment shown in FIGS. 1 and 2, reference numeral 1 is a floor slab, 2 is a floor slab on the upper floor, 3 is a partition wall, and the important chamber 4 is constituted by these elements. Reference numeral 5 is a reinforcing bar arranged in a mesh shape in the floor slab 2 and electrically connected thereto. In the floor slab 1 according to the present invention, a metal body 6 is embedded corresponding to the installation position of the partition wall 3, Electrical connection is made from the metal body 6 to the reinforcing bar 5 by a connecting wire 7. Here, the metal body 6 is a member in which a conductive fixing pin 8 is driven when the partition wall 3 is constructed as will be described later. For example, a metal plate or a foam metal can be used.

  As shown in FIG. 2, the partition wall 3 has a base lightweight steel frame 9 having a mesh structure and is supported between the floor slab 1 and the upper floor slab 2 via the lower runner 10 and the upper runner 11, respectively. Yes.

  In the above configuration, when the partition wall 3 is constructed, when the conductive fixing pin 8 is driven into the metal body 6 embedded in the floor slab 1 from the lower runner 10 to support the partition wall 3, the base wall of the partition wall 3 is used. The lightweight steel frame 9 can be grounded to the reinforcing bar 5 of the floor slab 1 from the fixing pin 8 through the metal body 6 and the connecting wire 7. That is, it is possible to perform construction work simultaneously with grounding work, which is electrical work.

On the other hand, as shown in the drawing, an insulating material 13 is interposed between the partition wall 3 and the upper floor slab 2 and the pillars 12 for insulation. In this case, as the insulating material 13, a general-purpose vibration isolating buffer made of an insulating material can be used, and by isolating in this way, the equipotential of the important chamber 4 and the partition wall can be obtained. 3, the grounding lightweight steel frame 9 having a mesh structure for electromagnetic shielding can be grounded at a place where the potential fluctuation of the floor slab 2 is small. As shown in FIG. 1, the upper side of the partition wall 3 is supported by driving a fixing pin 14 from the upper runner 11 to the upper floor slab 2. Since the metal body 6 such as the floor slab 1 is not embedded, it is not electrically connected to the reinforcing bar 15 of the floor slab 2 on the upper floor.
As described above, since the electromagnetic field generated by the lightning current flowing in the floor slab as the building structure is large depending on the location, it is assumed that the generation of the electromagnetic field is large in the embodiment shown in FIG. Insulation is performed by interposing an insulating material 13 between the location of the floor slab 1 and a part of the lower runner 10 of the partition wall 3. In this configuration, the influence of the electromagnetic field from the floor slab 1 is reduced. Further reduction can be achieved.

  Next, FIG. 3 shows another embodiment of the present invention. In this embodiment, the important room 4 can be installed at a distance from the upper floor slab and the pillar as a building structure. it can.

  3, reference numeral 101 denotes a floor slab, 102 denotes an upper floor slab, 103 denotes a pillar, and 104 denotes a beam. The partition wall 105 constituting the important room 4 is a runner (not shown). It is set as the structure supported by the stud 106 fixed between the floor slab 101 and the floor slab 102 of the upper floor through. On the upper side of the stud 106, an insulating material 107 is interposed between the upper runner and the floor slab 102 on the upper floor. The construction of the floor slab 101 and the partition wall 105 and the insulating material are the same as those in the embodiment shown in FIGS.

  Further, in this embodiment, an interior ceiling 108 having a lightweight steel frame with a mesh structure is provided in the important room 4 at a distance from the floor slab 102 on the upper floor, and the interior ceiling 108 and the base of the partition wall 105 are provided. A lightweight steel frame (not shown) is electrically connected.

  In the above embodiment, the important room 4 is the base of the mesh structure of the rebar 109 arranged in the mesh shape of the floor slab 101 as the building structure and the partition wall 105 constituting the important room 4 as described above. It can be shielded by an electromagnetic shielding structure using a lightweight steel frame for the interior and a lightweight steel frame for the groundwork of the mesh structure of the interior ceiling 108. For this reason, in the present invention, the floor slab 101 for grounding the base lightweight steel frame of the partition wall 105 with the above-described configuration is excluded from the floor slab 102 and the pillar 103 on the upper floor, which are other building structures. Therefore, even in a zone close to the outer wall in a building, a room that can suppress the influence of an electromagnetic field generated by a lightning current indicated by a two-dot chain line 110 in the figure at the time of a lightning strike is configured. be able to.

For example, the lightweight steel frame for the base of the partition wall has an effect of reducing the electromagnetic field penetrating therethrough by 1/5 or more by forming a mesh structure with an interval of 30 cm in which the joint portion is electrically connected. This is the same performance as an electromagnetic shield (Faraday cage) structure in which a mesh structure with the same interval is formed by a copper bar.
When a lightning strike occurs in a building, the highest magnetic field strength is instantaneously greater than 4000 A / m even within the building (assuming a lightning peak current of 100 kA, connect a lightning rod to the corner column on the top floor of the building) If it does, it will reach within 1m from the connected pillar). 4000A / m corresponds to the DC magnetic field class S4 (special environment) of JEITA (registered trademark) IT-1004. “Limit of record storage by magnetic media such as magnetic disk and magnetic tape (recorded data is lost in this environment) (... Omitted ...) Careful attention is required, including storage of recording media. ”(Extracted from JEITA (registered trademark) IT-1004).
On the other hand, when the mechanism of the present invention is applied, the range in which the magnetic field strength is 4000 A / m or more can be reduced to within 40 cm from the above-described pillar. Similarly, JEITA (registered trademark) IT-1004's DC magnetic field 400A / m, which corresponds to “Protected environment. Protected area of general households, offices, hospitals, etc. far away from protective earth conductors” To less than 1.4m (general buildings are within 3.6m).
In this example, one pillar was mentioned, but there are pillars that are directly connected to lightning rods in the building in this way. Therefore, in a normal structure, a strong magnetic field is generated within 1 m from the pillars in each place in the building. Because the equipment will be exposed, it is very difficult to construct a protective compartment. In the mechanism according to the present invention, the range can be reduced by more than 1/2, and the degree of freedom in the layout of important devices is improved.

  The lightweight steel frame for the base of the partition wall has an effect of reducing the strength of the electromagnetic field penetrating therethrough by 1/2 or more by, for example, making the joint portion a mesh structure with 45 cm intervals in which electrical connection is established. This is the same performance as an electromagnetic shield (Faraday cage) structure in which a mesh structure with the same interval is formed by a copper bar. In this mesh structure, in the above calculation, the range of 4000 A / m or more (equivalent to JEITA (registered trademark) IT-1004 Class S4) is within 80 cm, 400 A / m or more (equivalent to JEITA (registered trademark) IT-1004 Class B) The range is attenuated to within 2.6m.

DESCRIPTION OF SYMBOLS 1 Floor slab 2 Upper floor slab 3 Partition wall 4 Important room 5 Reinforcing bar 6 Metal body 7 Connection line 8 Fixing pin 9 Lightweight steel frame 10 Lower runner 11 Upper runner 12 Upper column 13 Insulation material 14 Fixing pin 15 Reinforcing bar 101 Floor slab 102 Upper floor slab 103 Column 104 Beam 105 Partition wall 106 Partition 107 Insulation material 108 Interior ceiling 109 Rebar 110 Lightning current

Claims (4)

In the building structure space, which constitutes an important room surrounded by a partition wall, a metal body is embedded in the floor slab corresponding to the installation position of the partition wall, and the mesh is arranged from this metal body. The partition wall has a mesh structure of a lightweight steel frame for groundwork, and the lightweight steel frame for groundwork is electrically conductive that is driven into the metal body in the lower runner. An electrical connection is made to the metal body by a fixing pin, grounded to the reinforcing bar of the floor slab via the connection line, and an insulating material is interposed between the partition wall and the upper floor slab and the stud. Equipotential and structural grounding mechanism for important rooms in buildings characterized by insulation. 2. The equipotential and structure grounding mechanism of an important room in a building according to claim 1, wherein insulation is performed by interposing an insulating material between a part of the lower runner of the partition wall and the floor slab. In the building structure space, which constitutes an important room surrounded by a partition wall, a metal body is embedded in the floor slab corresponding to the installation position of the partition wall, and the mesh is arranged from this metal body. The partition wall has a mesh structure with a lightweight steel frame for foundation and is supported by a stud fixed between the floor slab and the floor slab on the upper floor via a runner. The lightweight steel frame for groundwork is formed by the conductive fixing pin driven into the reinforcing bar of the floor slab through the metal body and the connecting wire from the conductive fixing pin driven into the metal body in the lower runner. An important room in a building characterized in that an electrical connection is made to the body, grounded to the reinforcing bar of the floor slab via the connecting line, and an insulating material is interposed between the upper runner of the stud and the floor slab of the upper floor Etc. Position and structure ground mechanism. The important room is equipped with an interior ceiling with a lightweight steel frame for the groundwork of the mesh structure separated from the floor slab and pillar of the upper floor, and the interior ceiling and the lightweight steel frame for the groundwork of the partition wall are electrically connected The equipotential and structure grounding mechanism of the important room in the building according to claim 3.

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