Electromagnetic shielding wall constructed by welding

Abstract

This provides shield room walls with minimal inter-story horizontal deformation but high performance requirements. [Solution] The shield wall 3 is separated into horizontal corner shield walls W3 and W4, and vertical corner shield wall W1 and internal shield wall W2. The weld joints between the shield members are covered with joint plates and integrated by welding such as seam welding. The horizontal corner shield walls W3 and W4 are continuous with the shield members covering the floor surface 1 and ceiling surface 8, respectively, and are integrated by welding such as seam welding. The horizontal gaps between the horizontal corner shield walls W3 and W4 and the vertical corner shield wall W1 and internal shield wall W2, and the vertical gaps between the vertical corner shield wall W1 and internal shield wall W2 are sealed with retaining edges and shield gaskets. The width of the vertical gap between the vertical corner shield wall W1 and internal shield wall W2 is ensured to be greater than or equal to the inter-story horizontal displacement δ expected on the installation floor A during an earthquake.

Description

Technical Field

[0001] The present invention relates to an electromagnetic shield wall (hereinafter referred to as a shield wall) constructed by welding including seam welding, which is surrounded by seismic walls and has small inter-story horizontal deformation due to seismic forces. For example, in an electromagnetic shield room (hereinafter referred to as a shield room) installed inside the basement floor of a building, it enables maintaining a certain deformation following performance and a high-level electromagnetic shielding performance.

Background Art

[0002] Floors such as the basement floor of a building are surrounded by thick walls with high horizontal rigidity and horizontal bearing capacity, so the inter-story horizontal deformation due to seismic forces is considerably smaller than that of the above-ground floors. Conventionally, in a shield room installed inside such a floor with small inter-story horizontal deformation, a construction method was generally used in which shield members (such as iron plates) of a predetermined size were joined together by welding to construct a shield wall with no gaps not only in the floor and ceiling but also in the walls.

[0003] On the other hand, even when a shield room is installed in a basement floor or the like where the inter-story horizontal deformation is considerably small as described above, there may be a requirement to ensure maintaining a certain deformation following performance and a high-level electromagnetic shielding performance.

[0004] In response to such a requirement, in the case of a conventional shield wall with no gaps where shield members are all welded, the in-plane rigidity of the wall surface is extremely high, but the followability with respect to inter-story horizontal deformation is extremely low. Since the shield members are thin, there is a risk of out-of-plane buckling leading to cracking at the welded joints.

[0005] As construction methods with good followability with respect to inter-story horizontal deformation for avoiding such out-of-plane buckling, for example, the techniques described in Patent Documents 1 and 2 are disclosed. The invention described in Patent Document 1 is a shield wall characterized in that a vertically elongated electromagnetic shield panel (hereinafter referred to as a shield panel) is formed by attaching a plurality of vertical reinforcing members to a reinforcing surface material such as gypsum board to which a metallic conductor (such as an iron plate) is bonded, and the shield panel is incorporated into a frame surrounded by vertical and horizontal furring strips, and the upper and lower ends of the vertical reinforcing members are fitted in an unrestrained state in the horizontal and vertical directions into U-shaped grooved metal fittings fixed to the horizontal furring strips located above and below the shield panel.

[0006] The shield wall disclosed in Patent Document 1 has the above configuration, and since the upper and lower ends of the vertical furring strips are fixed to the building, if the floor on which the shield room is installed experiences inter-story horizontal deformation, the vertical furring strips will tilt, causing the shield panel, which is unrestrained in the horizontal and vertical directions, to rotate (rock) within the frame enclosed by the vertical and horizontal furring strips. In particular, as shown in Figures 1 to 3 of Patent Document 1, vertically elongated shield panels are more prone to rocking than horizontally elongated ones, even if the panel area is the same, so it can be said that this characteristic is being effectively utilized.

[0007] Furthermore, since a gap is ensured so that adjacent shield panels do not come into contact with each other when the shield panels lock, the shield panels can be spared from damage, and the gap is sealed by the retaining edge pressing down on the shield gasket, thus preventing leakage of electromagnetic waves.

[0008] Therefore, a shield room constructed with such shield panels can be applied to underground floors and other areas where inter-story horizontal deformation is relatively small. However, this construction method is originally intended to allow the shield wall to follow large inter-story horizontal deformations. Since the shield wall is covered with multiple divided shield panels, and all the gaps around these shield panels must be sealed with shield gaskets to prevent electromagnetic wave leakage, applying this method to a shield wall that experiences only slight inter-story horizontal deformations may ensure performance, but it will significantly increase construction time and cost compared to the conventional welding method.

[0009] The invention described in Patent Document 2 states that by covering the shield wall surface with a plurality of divided shield panels, ensuring gaps so that adjacent shield panels do not come into contact with each other, and then using an elastic wool-like gasket of a certain thickness, which is pressed down by a retaining edge to reduce its original thickness to 1 / 5 to 1 / 10, high electromagnetic shielding performance can be obtained even if large interlayer horizontal deformation occurs and the gaps shift.

[0010] In other words, this invention, like the invention described in Patent Document 2, utilizes the rocking of the shield panel, and again aims to enable the shield wall surface to follow large inter-story horizontal deformations. Therefore, it is clear that the construction time and cost will be significantly increased compared to the conventional welding method.

[0011] One way to reduce costs and construction time in the manufacturing and installation of shield panels is to increase the size of each panel. However, increasing the size of each panel not only increases its weight and worsens workability on site, but also makes the shield panels more susceptible to out-of-plane bending deformation. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Japanese Patent Publication No. 2024-66780 [Patent Document 2] Patent No. 6556178 [Patent Document 3] Patent No. 5224566 [Overview of the Initiative] [Problems that the invention aims to solve]

[0013] As described above, even if the inter-story horizontal deformation caused by seismic forces is small on the floor where the shield room is installed, conventional welding methods have problems with deformation-following performance (out-of-plane buckling), making it difficult to ensure a high level of electromagnetic shielding performance. Furthermore, existing methods that utilize the rocking of shield panels to achieve high deformation-following performance have problems in terms of construction time and cost.

[0014] Therefore, the present invention provides a shield wall for a shield room that, even with small inter-story horizontal deformation due to seismic forces, has a certain deformation-following performance that exceeds the allowable limits of conventional welding methods, and is required to have a high level of electromagnetic shielding performance, and that can be constructed with better construction efficiency and at lower cost compared to conventional methods. [Means for solving the problem]

[0015] The means of the present invention for solving the above problem is, in the shield wall of the shield room on the installation floor of the building where the shield room is installed, (1) U-shaped groove members are installed on the floor surface of the installation floor and on the underside of the floor of the floor directly above it, in accordance with the arrangement of the shield wall. (2) At the corners of the shield rooms where the shield walls intersect, corner vertical furring strips to which shield members are attached are positioned at a height slightly less than the interior height of the installation floor, and the upper and lower ends of the corner vertical furring strips are fitted into the U-shaped groove members, so as to be displaceable in the vertical direction and displacement restrained in the direction of the material axis of the U-shaped groove members. (3) In the area of ​​the shield wall (general area) of the shield room excluding the corners, general area vertical furring strips to which the shield member is attached are arranged at predetermined intervals at a height slightly less than the interior height of the installation floor, and the upper end or upper and lower ends of the general area vertical furring strips are fitted into the U-shaped groove member and installed in such a state that they can be displaced in the vertical direction and in the material axis direction of the U-shaped groove member.

[0016] (4) A predetermined gap is secured between the upper end of the corner vertical furring strips and the general vertical furring strips and the underside of the floor of the floor directly above. (5) The shield wall is divided into the following parts: the shield wall near the floor surface and near the ceiling surface of the installation floor (referred to as the horizontal corner shield wall), the shield wall at the corner of the shield wall (referred to as the vertical corner shield wall), and the internal shield wall surrounded by the vertical corner shield wall and the horizontal corner shield wall (referred to as the internal shield wall). The shield members, reinforced with reinforcing panels, are attached to the shield walls of each of these parts. (6) The shield members, which have been processed to a predetermined size, are arranged on the entire surface of each of the shield walls of the respective parts, and adjacent shield members are integrated together by seam welding or general welding.

[0017] (7) The horizontal corner shield walls near the floor surface and ceiling surface of the installation floor are fixed to the floor surface of the installation floor or the underside of the floor of the floor directly above it, and are continuous with the shield members covering the floor surface and the ceiling surface, respectively, and are integrated by seam welding or general welding. (8) A horizontal gap is provided between the horizontal corner shield wall, the vertical corner shield wall, and the internal shield wall, and a vertical gap is provided between the vertical corner shield wall and the internal shield wall.

[0018] (9) The horizontal and vertical gaps are sealed by the retaining edge pressing down on the shield gasket. This electromagnetic shielding wall, constructed by welding, is characterized by having the above configuration.

[0019] moreover, (10) The vertical gap width provided between the vertical corner shield wall and the internal shield wall is ensured to be greater than or equal to the inter-story horizontal displacement during an earthquake expected on the floor of the building where the shield room is installed. This configuration can also be added.

[0020] As described above, for the shield wall constructed by welding according to the present invention, a horizontal gap is provided between the horizontal corner shield wall, the vertical corner shield wall, and the internal shield wall, and a vertical gap is provided between the vertical corner shield wall and the internal shield wall. Therefore, when the installed floor undergoes interlayer horizontal deformation, it exhibits the following behavior.

[0021] When the installed floor undergoes interlayer horizontal deformation, the internal shield wall that is welded and integrated, since the upper end (or upper and lower ends) of the general part vertical cylinder edge to which the internal shield wall is attached is not restricted from moving in the material axis (horizontal) direction of the U-shaped groove member, it is dragged by the interlayer horizontal deformation of the installed floor and maintains a vertical state without undergoing horizontal deformation or rotation (locking).

[0022] Also, even if an inertial force acts on the internal shield wall, due to the friction generated at the contact portion between the lower end of the general part vertical cylinder edge and the bottom surface of the U-shaped groove member, it is considered that there is almost no horizontal movement of the internal shield wall.

[0023] Incidentally, it can be said that the invention described in the above Patent Document 1 (see FIGS. 1 to 3) utilizes the fact that vertical shield panels are prone to locking. However, generally, the wall surface of a shield room is horizontally long, and the internal shield wall is also horizontally long.

[0024] Therefore, even if the horizontally long and large-area internal shield wall is regarded as a single shield panel in the invention described in Patent Document 1, the internal shield wall will not (or is unlikely to) undergo locking. That is, in the case of a horizontally long shield wall like the present invention, it can be said that the locking method is not suitable.

[0025] On the other hand, the upper and lower ends of the corner vertical cylinder edge are displaceable in the vertical direction, but are restricted from moving in the material axis (horizontal) direction of the U-shaped groove member and are fitted into the U-shaped groove member. Therefore, rotation (locking) occurs in accordance with the interlayer horizontal deformation of the installed floor.

[0026] In other words, the top of the vertical corner shield wall experiences horizontal displacement due to rocking, while the internal shield wall maintains its vertical position without horizontal movement. On the other hand, the horizontal corner shield walls near the floor and ceiling of the installation floor are fixed to the underside of the floor of the installation floor or the floor directly above it, resulting in horizontal displacement in the gap between them and the internal shield wall.

[0027] Furthermore, although the top of the vertical corner shield wall will experience horizontal displacement due to rocking, a gap with a width greater than the inter-story horizontal displacement of the installation floor is secured between the internal shield wall and the vertical corner shield wall, thus preventing the edges of these two shield walls from coming into contact with each other.

[0028] Furthermore, since all of these gaps are sealed by the retaining edge pressing down on the shield gasket, electromagnetic wave leakage is prevented even if misalignment occurs as described above.

[0029] Furthermore, Patent Document 3 (Japanese Patent No. 5224566) has shown that, under certain conditions, the shielding performance of shield walls constructed using conventional welding methods is comparable to that of shield walls constructed using conventional welding methods when the shield members are seam-welded. In addition, seam welding has the advantage of being fast to perform, and when stainless steel is used for the shield members, it does not produce smoke (fumes) like conventional welding. [Effects of the Invention]

[0030] Because the present invention is carried out by the means described above, the following effects can be obtained. (1) Since gaps are provided near the floor, ceiling, and corners of the shield room to separate the shield walls, the shield walls (internal shield walls) in the parts surrounded by these gaps do not undergo horizontal deformation caused by the inter-story horizontal deformation of the floor in which the shield room is installed, and therefore do not experience out-of-plane buckling of the shield members. Thus, it becomes possible to construct large-area shield wall surfaces integrally by welding. (2) Therefore, compared to conventional construction methods that utilize the rocking of shield panels, where the shield wall is divided into smaller sections to form shield panels, this method is more efficient in terms of manufacturing and construction, and can be built at a lower cost.

[0031] (3) The welding of shield members on the shield wall surface can also be done using the seam welding method, which has good construction efficiency, so it can be done in a shorter time and at a lower cost than with general welding methods. In addition, once the conditions are set, seam welding can be done to obtain a stable weld quality regardless of the skill of the worker, and it also has the advantage that no harmful smoke (fumes) are generated during welding. (4) In particular, when installing a shield room in a humid basement or similar location, it is desirable to use stainless steel as the shielding material for rust prevention purposes. Furthermore, if seam welding is used, rust prevention treatment of the welded area, which is required with ordinary steel plates, is unnecessary. [Brief explanation of the drawing]

[0032] [Figure 1] This figure shows the configuration (elevation and cross-section) of the shield wall of a shield room in an embodiment of the present invention. [Figure 2] This is a cross-sectional view of the section between A and B in Figure 1, illustrating the configuration of the vertical corner shield wall, which is the intersection of two shield walls. [Figure 3] In an embodiment of the present invention, this is an explanatory diagram showing the behavior of the shield wall when the floor on which the shield room is installed experiences inter-story horizontal deformation, where (a) shows the state before deformation and (b) shows the state after deformation. [Figure 4] This diagram illustrates the relationship between the shape and dimensions of a panel (wall) and its ease of rotation (rocking). [Modes for carrying out the invention]

[0033] Examples of the present invention will be explained in Figures 1 to 3. As shown in Figure 1, U-shaped groove members 4, 4, ... are installed on the floor surface 1 of the installation floor A where the shield room is installed, and on the underside of the floor 2 of the floor directly above it, in accordance with the arrangement of the shield wall 3.

[0034] At the corners of the shield room where the shield walls 3, 3 intersect, corner vertical furring strips 6, 6, ... are positioned at a height slightly less than the interior height H of the installation floor A, with shield members 5, 5, ... reinforced with reinforcing surface materials 5a, 5a, ... attached in a planar arrangement of orthogonal lines as shown in Figure 2. The upper and lower ends of the corner vertical furring strips 6, 6, ... are fitted into the U-shaped groove members 4, 4, ..., and are installed in a state where they can be displaced in the vertical direction, but are displacement-restricted in the horizontal direction of the material axis of the U-shaped groove members 4, 4, ....

[0035] In the general area of ​​the shield wall 3, excluding the corners of the shield room, general vertical furring strips 7, 7, ... are arranged at predetermined intervals at a height slightly less than the interior height H of the installation floor A, and the upper or upper and lower ends of the general vertical furring strips 7, 7, ... are fitted into the U-shaped groove members 4, 4, ... so that they can be displaced in the vertical direction and in the horizontal direction of the material axis of the U-shaped groove members 4, 4, ....

[0036] Above the upper ends of the corner vertical furring strips 6, 6, ... and the general vertical furring strips 7, 7, ..., a predetermined gap is ensured so that even if the installation floor A undergoes inter-story horizontal deformation, the upper ends of these vertical furring strips will not come into contact with the underside of the floor 2 of the floor directly above.

[0037] The shield wall 3 is divided into shield walls near the floor surface 1 and ceiling surface 8 of the installation floor A (referred to as horizontal corner shield walls W3 and W4, respectively), a shield wall at the corner of the shield room (referred to as vertical corner shield wall W1), and an internal shield wall (referred to as internal shield wall W2) surrounded by the vertical corner shield walls W1 and W1 and the horizontal corner shield walls W3 and W4. Shield members 5, 5, ... reinforced with reinforcing surface materials 5a, 5a, ... (gypsum board, plywood, etc.) are attached to the shield wall.

[0038] The shield members 5, 5, ... attached to the shield walls of each section (W1, W2, W3, W4) are metallic conductive surface materials of predetermined dimensions and thickness (for example, steel plates or stainless steel plates with a thickness of 0.5 to 1.5 mm), and the welded joints 5b, 5b, ... provided between adjacent shield members 5, 5, ... are covered with joint plates (not shown) made of the same material as the shield members 5, 5, ... and are integrated by seam welding or general welding.

[0039] The horizontal corner shield walls W3 and W4 are fixed to the floor surface 1 of the installation floor A or the underside of the floor surface 2 of the floor directly above it, and are integrated with the shield members 5, 5, ... that cover the floor surface 1 and ceiling surface 8 by seam welding or general welding, respectively.

[0040] Horizontal gaps are provided between the horizontal corner shield walls W3 and W4 and the vertical corner shield walls W1 and W1 and the internal shield wall W2, while vertical gaps are provided between the vertical corner shield walls W1 and W1 and the internal shield wall W2.

[0041] The horizontal and vertical gaps are sealed by the retaining edges 9, 9, ... which press down on the shield gasket (not shown).

[0042] The vertical gap width between the vertical corner shield wall W1 and the internal shield wall W2 is ensured to be greater than or equal to the inter-story horizontal displacement δ expected at the installation floor A during an earthquake. The above describes the configuration of the electromagnetic shield wall constructed by seam welding in this embodiment.

[0043] Because the shield wall has the above configuration, when the installation floor A undergoes inter-story horizontal deformation due to seismic forces, it exhibits the following behavior. Normally, as shown in Figure 3(a), the shield wall 3 is vertical. However, when an earthquake force acts in the direction of the arrow shown in Figure 3(b), the floor A on which the wall is installed undergoes inter-story horizontal deformation in the same direction as the arrow. This causes an inter-story horizontal displacement δ between the floor surface 1 and the floor underside 2 of the floor directly above, and the vertical corner shield walls W1, W1 rotate (rock).

[0044] When the installation floor A undergoes inter-story horizontal deformation, the internal shield wall W2, which is welded together by seam welding or the like, maintains its vertical state without being dragged along by the inter-story horizontal deformation of the installation floor A. This is because the upper ends (or upper and lower ends) of the general vertical furring strips 7, 7, ... are not constrained to move in the horizontal direction of the U-shaped groove members 4, 4, ... in the material axis direction.

[0045] Furthermore, even if the lower ends of the general vertical furring strips 7, 7, ... are not constrained from moving in the horizontal direction of the U-shaped groove members 4, 4, ..., a considerable frictional force acts on the contact area between the lower ends of the general vertical furring strips 7, 7, ... and the bottom surface of the U-shaped groove members 4, 4, ..., so it is considered that the internal shield wall W2 will hardly move horizontally even if inertial forces are acting on it.

[0046] Furthermore, since the walls of a shield room are generally horizontally oriented, and the internal shield wall W2 is also a large, horizontally oriented wall, unlike the case of a vertically oriented wall where rocking is likely to occur, the center of gravity of the wall is lower even with the same area, so rocking will not occur.

[0047] Here, referring to Figure 4, let's examine the relationship between the shape and dimensions of a panel (wall) and its ease of rotation (rocking) using a simple model. Figure 4 shows the state in which horizontal forces P1 and P2 due to an earthquake are acting on the center of gravity (panel weight G1=G2) of a vertically oriented panel 1 (H1 / B1>1.0) and a horizontally oriented panel 2 (H2 / B2<1.0).

[0048] At this time, both panels attempt to rotate around point O (the horizontal movement constraint point). However, due to the balance of forces, the horizontal forces P1 and P2 are P1 = G1 × B1 / H1 and P2 = G2 × B2 / H2, and P1 / P2 = (G1 / G2) × (B1 / H1) × (H2 / B2). Therefore, from the given conditions, G1 = G2, H1 / B1 > 1.0, H2 / B2 < 1.0, and thus P1 / P2 < 1.0.

[0049] In other words, the vertically oriented panel 1 is easier to rotate (rock) than the horizontally oriented panel 2. For example, when H1 / B1 = 1.5 and H2 / B2 = 0.75, P1 / P2 = 1.0 × 1 / 1.5 × 0.75 = 0.5. That is, the vertically oriented panel will rotate with half the external force acting on the horizontally oriented panel.

[0050] On the other hand, the upper and lower ends of the corner vertical furring strips 6, 6, ... are displaceable in the vertical direction, but are constrained to move in the horizontal direction of the material axis of the U-shaped groove members 4, 4, ... and are fitted into the U-shaped groove members 4, 4, .... Therefore, the elongated and slender vertical corner shield walls W1, W1 rotate (rock) in accordance with the inter-story horizontal deformation of the installation floor A.

[0051] In other words, the internal shield wall W2 within the installation area of ​​the general vertical furring strips 7, 7, ... maintains a vertical state without horizontal movement, even if the horizontal movement of the U-shaped groove members 4, 4, ... in the material axis direction is not restrained. On the other hand, the shield members 5 of the horizontal corner shield walls W3, W4 near the floor surface 1 and ceiling surface 8 of the installation floor A are welded together with the shield members 5 of the floor surface 1 or ceiling surface 8, so a horizontal displacement occurs in the gap between them and the internal shield wall W2.

[0052] Furthermore, as shown in Figure 3(b), the vertical corner shield walls W1, W1 will experience horizontal displacement due to rocking (≒inter-story horizontal displacement δ). At this time, a gap with a width greater than or equal to the inter-story horizontal displacement δ of the installation floor A is secured between these vertical corner shield walls W1, W1 and the internal shield wall W2, thus preventing the edges of these shield walls W1 and W2 from coming into contact with each other.

[0053] For example, assuming no horizontal movement of the internal shield wall W2, and assuming the assumed inter-story horizontal deformation of the installation floor A during an earthquake is 1 / 1000, then when the internal height H=5m, the required gap width should be H / 1000 = 5mm or more.

[0054] As described above, even if these gaps become misaligned, the shielding gasket is held in place and sealed by the retaining edges 9, 9, ..., thus preventing electromagnetic wave leakage.

[0055] Furthermore, when the shield members 5 are seam-welded together, it is known that under certain conditions, the shielding performance is comparable to that of shield walls constructed using conventional welding, making it suitable for shield rooms where a high level of shielding performance is required.

[0056] Furthermore, seam welding offers high construction efficiency, allowing for shorter construction periods and lower costs compared to conventional welding methods. Moreover, once the conditions are set, consistent weld quality can be obtained regardless of the worker's skill level. Additionally, when stainless steel is used as the shielding material, there is the advantage of not generating harmful fumes during welding.

[0057] In particular, when installing shield rooms in damp underground areas, using stainless steel for the shielding material is desirable for corrosion prevention. Furthermore, with seam welding, the corrosion prevention treatment of the welded area, which is necessary with ordinary steel plates, is unnecessary. [Industrial applicability]

[0058] This invention provides high-performance shield rooms that require small inter-story horizontal deformation due to seismic forces, but also demand a certain level of deformation-following performance and high-level electromagnetic shielding performance. Compared to conventional construction methods, it offers improved construction efficiency and lower costs, thus greatly contributing to the supply of facilities with extremely high requirements for preventing electromagnetic wave leakage. [Explanation of Symbols]

[0059] 1: Floor surface of the floor where the shield room is installed 2: Underside of the floor of the floor directly above the floor where the shield room is installed. 3: Shield Wall 4: U-shaped groove member 5: Shielding member 5a: Reinforcement panel 5b: Welded joint 6: Corner vertical furring strips 7: General section vertical furring strips 8: Ceiling surface 9: Retaining edge W1: Vertical corner shield wall W2: Internal shield wall W3, W4: Horizontal corner shield wall H: Interior height of the floor where the shield room is installed δ: Interstory horizontal displacement

Claims

1. In the electromagnetic shielding wall of the electromagnetic shielding room on the floor where the electromagnetic shielding room is installed in the building, (1) U-shaped groove members are installed on the floor surface of the installation floor and on the underside of the floor of the floor directly above it, in accordance with the arrangement of the electromagnetic shield wall. (2) At the corners of the electromagnetic shielding rooms where the electromagnetic shielding walls intersect, corner vertical furring strips to which shielding members are attached are positioned at a height slightly less than the interior height of the installation floor, and the upper and lower ends of the corner vertical furring strips are fitted into the U-shaped groove members, so as to be displaceable in the vertical direction and displacement restrained in the direction of the material axis of the U-shaped groove member. (3) In the area of ​​the shield wall of the electromagnetic shield room, excluding the corners, general vertical furring strips to which the shield member is attached are arranged at predetermined intervals at a height slightly less than the interior height of the installation floor, and the upper end or upper and lower ends of the general vertical furring strips are fitted into the U-shaped groove member in a state in which they can be displaced in the vertical direction and in the material axis direction of the U-shaped groove member. (4) A predetermined gap is secured between the upper end of the corner vertical furring strips and the general vertical furring strips and the underside of the floor of the floor directly above. (5) The electromagnetic shield wall is divided into horizontal corner shield walls, which are electromagnetic shield walls near the floor and ceiling of the installation floor; vertical corner shield walls, which are shield walls at the corners of the electromagnetic shield wall; and internal shield walls, which are internal shield walls surrounded by the vertical corner shield walls and the horizontal corner shield walls. The shield members, reinforced with reinforcing panels, are attached to each of the electromagnetic shield walls in each of the aforementioned sections. (6) The shield members, which have been processed to a predetermined size, are arranged on the entire surface of each of the electromagnetic shield walls of the respective parts, and adjacent shield members are integrated together by seam welding or general welding. (7) The horizontal corner shield walls near the floor surface and ceiling surface of the installation floor are fixed to the floor surface of the installation floor or the underside of the floor of the floor directly above it, and are continuous with the shield members covering the floor surface and the ceiling surface, respectively, and are integrated by seam welding or general welding. (8) A horizontal gap is provided between the horizontal corner shield wall, the vertical corner shield wall, and the internal shield wall, and a vertical gap is provided between the vertical corner shield wall and the internal shield wall. (9) The horizontal and vertical gaps are sealed by the retaining edge pressing down on the shield gasket. An electromagnetic shielding wall constructed by welding, characterized by having the above configuration.

2. An electromagnetic shielding wall constructed by welding according to claim 1, characterized in that the width of the vertical gap provided between the vertical corner shielding wall and the internal shielding wall is greater than or equal to the inter-story horizontal displacement during an earthquake expected on the floor of the building where the electromagnetic shielding room is installed.

3. An electromagnetic shielding wall constructed by welding according to claim 1, characterized in that the ratio H / B of the height dimension H to the width dimension B of the internal shielding wall is less than 1.

0.

4. An electromagnetic shielding wall constructed by welding according to any one of claims 1 to 3, characterized in that at least the shielding member of the internal shielding wall is a stainless steel plate and is welded by seam welding.

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