JP7277353B2 - NET SUPPORT STRUCTURE AND METHOD FOR INSTALLING NET SUPPORT STRUCTURE - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Publication date: June 1, 2019 Publication location: Tokyo Electric Power Company Holdings, Inc. Kashiwazaki-Kariwa Nuclear Power Station (16-46 Aoyamacho, Kashiwazaki City, Niigata Prefecture)

The present disclosure relates to net support structures and methods of mounting such net support structures.

A building, which is a structure, generally has openings for the purpose of loading and unloading equipment and personnel, ventilation, and the like. In such openings, flying objects from the outside may enter the space inside the building. Flying objects can be generated by, for example, flying objects caused by gusts or tornadoes, falling aircraft, or fire explosions in nearby chemical plants.

Intrusion of flying objects through openings may affect equipment installed inside the building. In order to prevent the entry of such flying objects, it is conceivable to cover the opening with a steel plate having sufficient strength, but it is difficult to secure the opening and the weight increases, which is disadvantageous in terms of earthquake resistance. Prone. On the other hand, for example, Patent Literature 1 describes that a wire net is used as an intrusion suppressing portion provided in an opening to prevent flying objects from entering through the opening. Wire nets are lighter than iron plates and are advantageous in that they are easier to secure openings in buildings.

JP 2015-132137 A

In Patent Literature 1, a wire net attached to the opening of the building receives flying objects from the outside, thereby preventing flying objects from entering the interior of the building. Such a wire net needs to be fixed to the building with sufficient strength by a fixing structure such as an anchor so that it can withstand the load applied when it receives a flying object. When the wire net is directly fixed to the building, the load generated when the wire net receives the flying object directly acts on the anchor that fixes the wire net to the building. Therefore, in order to ensure sufficient fixing strength of the wire net to the building, the number of anchors has to be increased, which lengthens the period required for installation work to the building.

At least one embodiment of the present disclosure has been made in view of the circumstances described above, and includes a net support structure that has a simple configuration and sufficient strength and can be mounted with less work load, and a method for mounting the net support structure. intended to provide

In order to solve the above problems, the net mounting structure according to some embodiments of the present disclosure includes:
a frame capable of supporting a net for covering the building opening;
anchors for securing the frame to the building;
with
The anchors secure the frame to the building at support locations remote from load bearing points of the net on the frame.

In order to solve the above problems, the net mounting structure mounting method according to some embodiments of the present disclosure includes:
a frame capable of supporting a net for covering the building opening;
anchors for fixing the frame to the building via supporting members;
with
A method for attaching a net support structure, wherein the anchors fix the frame to the building at a support position remote from a load-bearing point of the net on the frame,
attaching the net to the frame;
a step of fixing the support member to the building with the anchor;
transporting the frame with the net attached thereto and attaching it to the support member fixed to the building by the anchor;
Prepare.

According to at least one embodiment of the present disclosure, it is possible to provide a net support structure that has a simple configuration and sufficient strength so that it can be mounted with less work load, and a method for mounting the net support structure.

FIG. 1 is a perspective view showing the overall configuration of a net support structure according to one embodiment of the present disclosure. FIG. 2 is a cross-sectional view taken along line LL of FIG. 1; 3 is an enlarged view of area M in FIG. 2; FIG. It is a modification of FIG. FIG. 3 is a schematic diagram showing the net support structure of FIGS. 1 and 2; FIG. It is a modification of FIG. It is a modification of FIG. It is a modification of FIG. It is a modification of FIG. FIG. 10 is a cross-sectional view taken along line PP of FIG. 9; It is a modification of FIG. FIG. 12 is a flow chart illustrating a step-by-step method of installing a net support structure according to at least one embodiment of the present disclosure.

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.

FIG. 1 is a perspective view showing the overall configuration of a net support structure 1 according to an embodiment of the present disclosure, and FIG. 2 is a cross-sectional view taken along line LL of FIG. 1 and 2 show how the net support structure 1 is attached to the wall 4 of the building 2 to which it is attached. The building 2 is erected on a foundation (not shown) buried in the ground, and a wall 4 that is part of the building 2 is shown in FIGS. 1 and 2 . The wall 4 stands substantially vertically and forms at least part of the appearance of the building 2 . A space 6 is provided inside the wall 4 . The space 6 is an arbitrary space having a size according to the application, and for example, equipment can be placed therein.

The wall 4 has a predetermined thickness defined by an outer wall surface 4 a facing the outside and an inner wall surface 4 b facing the space 6 . In the following description, a three-dimensional orthogonal coordinate system including the X-axis along the vertical direction on the XY plane parallel to the wall 4, the Y-axis perpendicular to the X-axis on the XY plane, and the Z-axis perpendicular to the XY plane described using

Wall 4 has an opening 8 . Although the opening 8 can take any shape, the opening 8 having a substantially rectangular cross-sectional area on the XY plane is shown as an example in this embodiment. Specifically, the opening 8 has a substantially rectangular opening cross-sectional area defined by a short side L1 along the X direction and a long side L2 (>L1) along the Y direction.

An opening reinforcing bar 10 for reinforcement is provided in the vicinity of the opening 8 in the wall 4 . The opening reinforcing bars 10 are provided at the corners of the opening 8 on the side of the outer wall surface 4a, thereby compensating for the local decrease in strength due to the existence of the opening 8. As shown in FIG. Such opening reinforcing bars 10 extend along the edge of the opening 8 so as to correspond to the shape of the opening 8 . Specifically, the opening reinforcing bars 10 extend with a constant width so as to surround the opening 8 on the XY plane, and the inside thereof coincides with the short side L1 and the long side L2 of the opening 8. is designed to The opening reinforcing bars 10 extend along the Z direction from the outer wall surface 4a to a predetermined depth L3 (<the thickness L4 of the wall 4).

For example, if the building 2 is a reactor building that constitutes a part of a nuclear power plant, the space 6 contains equipment that constitutes the nuclear reactor. Since the wall 4 that constitutes the building 2 is provided with the opening 8 as described above, flying objects from the outside enter the space 6 inside the building 2 through the opening 8 during strong winds. need to be prevented. For this purpose, the net support structure 1 is attached to the building 2 while supporting the net for receiving the flying object, thereby receiving the flying object from the outside with the net and moving it into the space 6 of the flying object. By preventing the intrusion of , the equipment and the like arranged in the space 6 are protected.

The net support structure 1 comprises a frame 12 for supporting a net (not shown) for covering the opening 8 of the building 2 . The frame 12 has load bearing points for supporting the net. The load support point is a position where a load is input from the net when the net supported by the frame 12 receives a flying object. Although the specific configuration of the net attached to the frame 12 will not be described, for example, the load supporting points are configured so that support wires attached to the net can be engaged so that the net receives flying objects. The load from the is input to the load bearing point through the supporting wire.

Frame 12 has a shape corresponding to opening 8 . In this embodiment, since the opening 8 has a substantially rectangular shape as described above, the frame 12 also has a substantially rectangular shape. Specifically, as shown in FIG. 2, when the frame 12 is attached near the opening 8 from the outer wall surface 4a side, the inner edge of the frame 12 and the inner edge of the opening 8 are aligned. may be designed to Accordingly, since the opening 8 is not narrowed when the frame 12 is attached to the opening 8, the influence of attaching the net support structure 1 to the building 2 can be reduced.

The frame 12 may be constructed by combining frame members 12a to 12d each having an H-shaped vertical section in the extending direction. By adopting the frame members 12a to 12d having such an H shape, the frame 12 can be made lighter and stronger than simple rod-shaped members. This is effective in reducing the work load when attaching the net support structure 1 to the building 2 .

In the present embodiment, the frame members 12a and 12c extending in the X direction have lengths corresponding to the short sides L1 of the opening 8 and extend in the Y direction so as to correspond to the opening 8 having a substantially rectangular shape. The extending frame members 12b and 12d have a length corresponding to the long side L2 of the opening 8, and the frame 12 is constructed by combining them. The frame members 12a to 12d are connected by, for example, bolting the members together, but the connection method is not limited to this.

FIG. 3 is an enlarged view of area M in FIG. Each of the H-shaped frame members 12a to 12d has a first recess 14 that opens inward on the ZX plane and a second recess 16 that opens outward from the opening 8. As shown in FIG. When the frame members 12a to 12d are connected to each other to form the frame 12, the first concave portions 14 of the frame members 12a to 12d are connected along the inner periphery of the frame 12 to form a net (not shown). forming a space for arranging the wire W attached to the .

As shown in FIG. 3, a wire W for supporting the net is arranged inside the first recess 14 . As a result, even if the wire W supporting the net is deformed in the direction indicated by the arrow N in FIG. Since it is surrounded, it is possible to prevent an extra gap from being created between it and the frame 12. - 特許庁In addition, when the frame 12 is viewed from the outside, the wires W supporting the net are arranged so as to be hidden inside the first recesses 14, so that the wires W can be preferably protected from the outside.

FIG. 4 is a modification of FIG. In this modification, the frame 12 is provided with a lid portion 18 that covers the second concave portion 16 . The lid portion 18 is fixed to the frame 12 by, for example, bolts (not shown). By covering the second concave portion 16 with the lid portion 18 in this manner, the rigidity of the H-shaped frame 12 can be further improved.

4 may be used for the upper frame member 12b among the four frame members 12a to 12d forming the frame 12. As shown in FIG. When the net support structure 1 is attached to the building 2 located outdoors, the second recessed portion 16 of the frame member 12b located above is susceptible to intrusion of rainwater or the like from above. Therefore, by covering the second concave portion 16 of the frame member 12b arranged above with the lid portion 18, it is possible to suitably prevent such intrusion of rainwater and the like.

Since each of the frame members 12a to 12d has an H-shaped cross section as described above, members such as louvers can be easily attached to the side surfaces thereof.

Returning to FIGS. 1 and 2 again, the frame 12 having such a configuration is fixed to the building 2 by anchors 22. As shown in FIG. The anchors 22 fix the frame 12 to the building 2 at support positions SP1 to SP4 set on the frame 12 . The number of anchors 22 at each of the support positions SP1 to SP4 is set to such an extent that the strength required to stably attach the net support structure 1 to the building 2 can be obtained. By providing a configuration that does so, the number of anchors 22 at each of the support positions SP1 to SP4 can be reduced.

As shown in FIGS. 1 and 2, anchors 22 may secure frame 12 via support members 30 . The support member 30 has one end fixed to support positions SP1 to SP4 set on the frame 12 and the other end fixed to the building 2 by an anchor 22 . By using such a support member 30 , it is possible to flexibly set the fixing position to the building 2 by the anchor 22 without being restricted by the shape of the frame 12 .

The support member 30 may be configured including a base plate 32 and a connecting member 34 . Base plate 32 is fixed to building 2 by anchors 22 . The base plate 32 has, for example, a flat plate shape capable of making surface contact with the wall 4 of the building 2 and is fixed by a plurality of anchors 22 . The connecting member 34 is a member for connecting the base plate 32 fixed to the building 2 with the anchors 22 and the frame 12 by being interposed between the base plate 32 and the frame 12 .

The anchors 22 that fix the frame 12 may be arranged so as to avoid the opening reinforcing bars 10 provided in the opening 8 . If the anchors 22 were directly fixed to the opening reinforcing bars 10, the reinforcing effect of the opening reinforcing bars 10 would be reduced. It becomes possible to install the frame 12 while maintaining the reinforcement effect of the muscle 10 . In this embodiment, since the frame 12 is fixed by the anchors 22 through the support members 30, the length of the support members 30 can be adjusted to easily achieve a layout that avoids the opening reinforcing bars 10. FIG.

Here, FIG. 5 is a schematic diagram schematically showing the net support structure 1 of FIGS. 1 and 2. As shown in FIG. In FIG. 5, load supporting points LP1 to LP4 for supporting the wire W supporting the net to the frame 12 are provided at four corners C1 to C4 of the frame 12 having a substantially rectangular shape, respectively. The load supporting points LP1 to LP4 are provided inside the first recess 14 as described above with reference to FIG. FIG. 5 also shows support positions SP1 to SP4 of the frame 12 by the anchors 22 (the support positions SP1 to SP4 are the positions of the frame 12 when the frame 12 is fixed to the building 2 via the support members 30). ).

As shown in FIG. 5, the support positions SP1-SP4 are set apart from the load support points LP1-LP4. At least part of the load input from the load supporting points LP1 to LP4 is shared by the frame 12 by deformation of the net supported by the frame 12, and does not act directly on the anchors 22. As a result, the load acting on the anchors 22 is reduced, and the number of anchors 22 required to fix the frame 12 to the building 2 can be reduced. becomes possible. This is advantageous in reducing work load, such as shortening the construction period for attaching the net support structure 1 to the building 2 and reducing the weight of the net support structure 1 .

In this embodiment, the load supporting points LP1 to LP4 of the frame 12 are provided at the corners C1 to C4 as described above, and the support positions SP1 to SP4 are provided at positions away from the corners C1 to C4. ing. As a result, at least a portion of the load input from the load support points LP1 to LP4 acts on the frame 12 in a shared manner, and the rest of the load is applied to the support provided on each side between the adjacent corners C1 to C4. It will be transmitted to the building 2 via the positions SP1 to SP4.

Further, in this embodiment, a plurality of support positions SP1 to SP4 of the frame 12 by the anchors 22 are provided along the frame 12. As shown in FIG. In the embodiment of FIG. 5, two support positions are provided for each of the two long sides of the frame 12 having a substantially rectangular shape (the upper long side is provided with SP1 and SP4, and the lower long side is provided with SP1 and SP4). are provided with SP2 and SP3). As a result, the support span between the adjacent support positions SP1 to SP4 is shortened, and the load applied to the frame 12 when the net receives a flying object can be distributed more effectively.

Further, the support positions SP1 to SP4 provided on the frame 12 may be provided symmetrically with respect to the central portion O of the frame 12. FIG. By symmetrically arranging the support positions SP1 to SP4, the component forces of the load input from the respective corner portions C1 to C4 of the frame 12 are balanced at the approximate center portions 15a to 15d of the respective sides of the frame 12, resulting in good durability. Loadability can be exhibited. As a result, the load applied to the frame 12 when the net receives a flying object can be distributed more favorably.

5 illustrates a case where the extending direction of the support member 30 is arranged along the vertical direction, as long as the support positions SP1 to SP4 are separated from the load support points LP1 to LP4, the support member The extending direction of 30 may be tilted with respect to the vertical direction.

FIG. 6 is a modification of FIG. In the above-described embodiment, as shown in FIG. 5, two support positions SP1 to SP4 are set for each of the two upper and lower long sides of the frame 12 having a substantially rectangular shape, and each of the support positions SP1 to SP4 are set. A support member 30 was provided in SP4. In the modified example shown in FIG. 6, in addition to the embodiment shown in FIG. 5, support positions SP5 and SP6 are added to each of the left and right short sides of the frame 12, and support members 30 are provided at the support positions SP5 and SP6, respectively. The frame 12 may be fixed by anchors 22 through the .

FIG. 7 is another modification of FIG. In the modification shown in FIG. 7, two support positions SP1 to SP4 are set for each of the two short sides on the left and right sides of a frame 12 having a substantially rectangular shape, and support members are provided at each of the support positions SP1 to SP4. 30 are provided. In this modification, an upper support position SP5, which is a fifth support position, is set for the upper one of the two upper and lower long sides. is provided. By providing the upper support position SP5 in this way, the weight of the frame itself and the weight of accumulated snow in a snowfall area are supported by the anchors 22 at the upper support position SP5, and the stability of the frame 12 relative to the building 2 can be effectively improved.

Note that the upper support position SP5 may be arranged at a substantially central portion 15d positioned substantially at the midpoint of the upper long side of the frame 12. As shown in FIG. As a result, each support position SP with respect to the frame 12 can be set symmetrically, and the component forces of the load input from the corner portions C1 and C4 of the frame 12 are balanced at the substantially central portion 15d, resulting in good load resistance. can be exhibited, the net support structure 1 can be mounted in a well-balanced manner.

FIG. 8 is another modification of FIG. In the variant shown in FIG. 8, the frame 12 is directly supported by the anchors 22 without the support members 30 intervening. Even in this case, the support positions SP1 to SP4 by the anchors 22 are configured to be separated from the load support points LP1 to LP4 of the frame 12, so that part of the load input from the load support points LP1 to LP4 is transferred to the frame 12. , and the load acting on the anchor 22 can be reduced.

FIG. 9 is another modification of FIG. In the modified example shown in FIG. 9, the frame 12 is supported by the anchors 22 via the support members 30, but the difference is that the support members 30 consist of only the base plate 32. In the modification shown in FIG. That is, compared to FIG. 5, the support member 30 does not have connecting members 34 so that the frame 12 is directly connected to the base plate 32 which is fixed to the building 2 by the anchors 22 . Even in this case, the support positions SP1 to SP4 by the anchors 22 are configured to be separated from the load support points LP1 to LP4 of the frame 12, so that part of the load input from the load support points LP1 to LP4 is transferred to the frame 12. , and the load acting on the anchor 22 can be reduced.

10 is a cross-sectional view taken along line PP of FIG. 9. FIG. In this variation, as shown in FIG. 10, a load reducing structure 40 may be provided between frame 12 and base plate 32 to reduce the load acting on anchor 22 from frame 12 . The load reduction structure 40 includes a first protrusion 42 that protrudes toward the base plate 32 from the surface of the frame 12 that faces the base plate 32 , and a first protrusion 42 that protrudes from the surface of the base plate 32 that faces the frame 12 toward the frame 12 . A spring member 46 provided along the in-plane direction is provided between the second convex portion 44 and the second convex portion 44 . As a result, the load input to the frame 12 is partially shared by the frame 12 itself and then reduced by the spring member 46 when transmitted to the base plate 32 .

FIG. 11 is a modification of FIG. In this modified example, the load reduction structure 40 includes a long hole 47 provided on the surface of the frame 12 facing the base plate 32 , and extending from the base plate 32 toward the frame 12 and having its tip inserted into the long hole 47 . and an extending portion 49 which is formed and can be fixed with a nut 48 from the frame 12 side. The elongated hole 47 has a wider opening area than the extension part 49 , and the extension part 49 is configured to be movable within the range of the elongated hole 47 while being fixed with a nut 48 at its tip. As a result, the load input to the frame 12 is partially shared by the frame 12 itself and then reduced by the load reduction structure 40 when transmitted to the base plate 32 .

In the net support structure 1 of the above-described embodiment, the frame 12 is attached to the outer wall surface 4a side of the building 2, but the frame 12 is attached to the inner wall surface 4b side of the building 2. Alternatively, the frame 12 may be mounted inside the opening 8 of the building 2 .

Next, a method for mounting the net support structure 1 having the above configuration will be described. FIG. 12 is a flow chart showing a step-by-step method of installing the net support structure 1 according to at least one embodiment of the present disclosure.

First, a frame 12 constituting the net support structure 1 is prepared, and a net (not shown) is attached to the frame 12 (step S1). Any method may be used to attach the net to the frame 12. For example, as described above, the wire W for attachment is attached to the net, and the wire W is fixed to the load supporting points LP1 to LP4 set on the frame 12. done. The work of attaching the net to the frame 12 in step S1 is performed at a location away from the site where the net support structure 1 is attached (that is, the location where the building 2 is located) (for example, at a factory away from the site). ).

Subsequently, the support members 30 are fixed with the anchors 22 to the building 2 to which the net support structure 1 is to be attached (step S2). In step S2, first, the aforementioned support positions SP1 to SP4 are determined on the building 2 side, and the support members 30 are fixed with anchors 22 to the support positions SP1 to SP4. At this time, one end of the support member 30 is fixed to the building 2 by the anchor 22, while the other end of the support member 30 is open.

In step S2, when the support member 30 includes the base plate 32 and the connection member 34, the support member 30 is completed in advance by combining the base plate 32 and the connection member 34. The member 30 may be fixed with the anchor 22, or only the base plate 32 of the support member 30 may be fixed to the building 2 with the anchor 22, and the connecting member 34 may be further fixed to the base plate 32 fixed with the anchor 22. can be Also, as shown in FIG. 9, when the support member 30 is composed of only the base plate 32, only the base plate 32 may be fixed by the anchors 22 in step S2.

Although FIG. 12 illustrates the case where step S2 is performed after step S1, step S2 may be performed before step S1, or steps S1 and S2 may be performed simultaneously.

Subsequently, the frame 12 to which the net is attached in step S1 is transported to the site (step S3), and attached to the support member 30 fixed by the anchors 22 in step S2 (step S4). At this time, the load supporting points LP1 to LP4 have already been determined in step S1, and the support positions SP1 to SP4 have already been determined in step S2. The net support structure 1 having the above configuration away from the points LP1-LP4 can be easily completed.

As described above, according to the above-described mounting method, the work of mounting the net to the frame 12 and the work of fixing the support member 30 to the building 2 are performed separately in advance, so that the net support structure 1 can be assembled on site. It can make your work easier. As a result, the work load on the site is reduced, and the net support structure 1 can be attached to the building 2 in a short construction period.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the scope of the present disclosure, and the above-described embodiments may be combined as appropriate.

The contents described in each of the above embodiments are understood as follows, for example.

(1) The net support structure according to some embodiments of the present disclosure (for example, the net support structure 1 of the above embodiment)
a frame (for example, frame 12 in the above embodiment) capable of supporting a net for covering an opening (for example, opening 8 in the above embodiment) of a building (for example, building 2 in the above embodiment);
Anchors for fixing the frame to the building (for example, the anchors 22 in the above embodiment);
with
The anchors attach the frame to the building at support positions (for example, support positions SP1 to SP4 in the above embodiment) away from the load support points of the net in the frame (for example, load support points LP1 to LP4 in the above embodiment). fixed.

According to the aspect (1) above, the support position of the frame by the anchor is set away from the load-bearing point of the net in the frame. As a result, when the net receives a flying object, part of the load input from the load supporting point is shared by the frame, and the load acting on the anchor is reduced. As a result, anchors for fixing the frame to the building can be simplified.

(2) In some embodiments, in the aspect of (1) above,
the frame has a rectangular shape,
The support positions are separated from the rectangular corners (for example, the corners C1 to C4 in the above embodiment).

According to the above aspect (2), the support position by the anchor is set at a position apart from the corner portion of the rectangular frame (that is, the extending portion between the adjacent corner portions of the frame). be. As a result, when the net receives a flying object, part of the load input from the load supporting point can be effectively shared by the frame.

(3) In some embodiments, in aspects (1) or (2) above,
The anchor fixes the frame via a support member (for example, the support member 30 of the above embodiment).

According to the aspect (3) above, the frame is fixed by the anchor via the support member. By interposing the support member between the frame and the anchor, it is possible to flexibly set the fixing position of the anchor to the building without being restricted by the shape of the frame.

(4) In some embodiments, in the aspect of (3) above,
The support member includes a base plate fixed to the building by the anchor, and a connecting member for connecting the base plate and the frame.

According to the above aspect (4), by configuring the supporting member by combining the base plate and the connecting member, it is possible to flexibly set the fixing position to the building by the anchor.

(5) In some embodiments, in any one aspect of (1) to (4) above,
The anchors are arranged so as to avoid the opening reinforcing bars provided in the opening (for example, the opening reinforcing bars 10 in the above embodiment).

According to the aspect (5) above, by arranging the anchors so as to avoid the opening reinforcing bars, it is possible to satisfactorily secure the strength of the building when the net support structure is attached to the building.

(6) In some embodiments, in any one aspect of (1) to (5) above,
A plurality of the support positions are provided along the frame.

According to aspect (6) above, a plurality of support positions are provided along the frame. As a result, the support span between adjacent support positions is shortened, and the load input to the frame when the net receives a flying object can be distributed more effectively.

(7) In some embodiments, in any one aspect of (1) to (6) above,
The support positions include an upper support position (for example, the upper support position SP5 in the above embodiment) that supports the upper portion of the frame.

According to aspect (7) above, at least the upper portion of the frame is fixed by the anchor at the upper support position. As a result, the weight of the frame itself and the weight of accumulated snow in a snowfall area are supported by the anchors at the upper support positions, and the stability of the frame relative to the building can be effectively improved.

(8) In some embodiments, in any one aspect of (1) to (7) above,
The support positions are arranged symmetrically with respect to the center of the frame (for example, the center O in the above embodiment).

According to the above aspect (8), the support positions are arranged symmetrically with respect to the center of the frame, so that the frame is supported with good balance with respect to the building. As a result, the components of the load input from the corners of the frame when a flying object is received by the net are balanced approximately at the center of each side of the frame, and good load resistance can be exhibited. As a result, the load applied to the frame can be distributed more favorably.

(9) In some embodiments, in any one aspect of (1) to (8) above,
The frame extends along the edge of the opening and has an H-shaped vertical section in the extending direction.

According to the above aspect (9), by making the vertical cross section in the extending direction of the frame H-shaped, the rigidity of the frame can be satisfactorily secured.

(10) In some embodiments, in the aspect of (9) above,
The H shape has a first recess (for example, the first recess 14 in the above embodiment) that opens toward the inside of the opening,
The support position is configured to support a wire (eg, wire W in the above embodiment) attached to the net inside the first recess.

According to the above aspect (10), the wire attached to the net is supported with respect to the frame at the support position provided inside the first recess that opens toward the inside of the opening in the H shape. This can prevent a gap from forming between the net and the frame when the wires are deformed by the net's own weight.

(11) In some embodiments, in aspects (9) or (10) above,
The H shape has a second recess (for example, the second recess 16 in the above embodiment) that opens toward the outside of the opening,
The H-section steel has a lid portion (for example, the lid portion 18 in the above embodiment) that covers the second recess.

According to the above aspect (11), good frame rigidity is obtained by covering the second concave portion that opens toward the outside of the opening in the H shape with the lid portion.

(12) In some embodiments, in the aspect of (11) above,
The lid is provided on the upper side of the frame.

According to the aspect (12) above, by covering the second recess with the lid on the upper side of the frame, it is possible to preferably prevent foreign substances such as water from entering the second recess.

(13) In some embodiments, in any one aspect of (1) to (12) above,
The inner peripheral side of the frame is provided on the outer wall surface of the building (for example, the outer wall surface 4a in the above embodiment) so as to correspond to the inner peripheral edge of the opening.

According to the above aspect (13), the frame is attached so that the inner peripheral side of the frame corresponds to the edge of the inner peripheral side of the opening, so that the frame does not interfere with the opening.

(14) In some embodiments, in any one aspect of (1) to (13) above,
The building is a reactor building,
The net is a protective net for preventing flying objects from entering the interior of the reactor building through the opening.

According to the above aspect (14), by attaching a protective net to the opening of the reactor building using the net support structure, the equipment inside the reactor building is protected against flying objects from the outside. can be protected.

(15) A method for attaching a net support structure according to some embodiments of the present disclosure (for example, net support structure 1 in the above embodiment) includes:
a frame (for example, frame 12 in the above embodiment) capable of supporting a net for covering an opening (for example, opening 8 in the above embodiment) of a building (for example, building 2 in the above embodiment);
Anchors (for example, the anchors 22 in the above embodiment) for fixing the frame to the building via support members (for example, the support members 30 in the above embodiment);
with
The anchors attach the frame to the building at support positions (for example, support positions SP1 to SP4 in the above embodiment) away from the load support points of the net in the frame (for example, load support points LP1 to LP4 in the above embodiment). A method for mounting a net support structure, comprising:
a step of attaching the net to the frame (for example, step S1 in the above embodiment);
A step of fixing the support member to the building with the anchor (for example, step S2 in the above embodiment);
a step of transporting the frame to which the net is attached and attaching it to the support member fixed to the building by the anchor (for example, steps S3 and S4 in the above embodiment);
Prepare.

According to the aspect (15) above, the work of attaching the net to the frame and the work of fixing the support member to the building using the anchors are performed separately in advance. The former determines the load support point, and the latter determines the support position. Therefore, when both are combined, a configuration in which the support position is separated from the load support point can be easily realized. Thus, the net support structure having the above configuration can be easily attached to the building. In addition, as mentioned above, the net support structure has a stable net support structure with a small number of anchors by distributing the load from the load support points to the frame by arranging the support positions away from the load support points. can be realized. As a result, the burden of fixing work with anchors can be reduced. By attaching the net support structure to the building in this manner, the work load can be reduced and the construction period can be effectively shortened.

1 Net Support Structure 2 Building 4 Wall 6 Space 8 Opening 10 Opening Reinforcing Bar 12 Frame 14 First Recess 16 Second Recess 18 Lid 22 Anchor 30 Supporting Member 32 Base Plate 34 Connecting Member 40 Load Reduction Structure 42 First Projection 44 Second protrusion 46 Spring member 47 Long hole 48 Nut 49 Extensions C1 to C4 Corners LP1 to LP4 Load support points SP1 to SP5 Support position W Wire

Claims (16)

a frame capable of supporting a net for covering the building opening;
anchors for securing the frame to the building;
with
the anchors secure the frame to the building at a support location remote from a load-bearing point of the net on the frame;
The net support structure, wherein the anchors are arranged to avoid opening reinforcing bars provided in the openings. the frame has a rectangular shape,
2. The net support structure of claim 1, wherein said support locations are remote from said rectangular corners. The net support structure according to claim 1 or 2, wherein the anchors fix the frame via support members. 4. The net support structure according to claim 3, wherein said support member includes a base plate fixed to said building by said anchor, and a connecting member for connecting said base plate and said frame. The net support structure according to any one of claims 1 to 4, wherein a plurality of said support positions are provided along said frame. 6. A net support structure according to any one of the preceding claims, wherein the support positions comprise upper support positions supporting the upper part of the frame. 7. A net support structure according to any one of claims 1 to 6, wherein the support locations are arranged symmetrically with respect to the center of the frame. The net support structure according to any one of claims 1 to 7, wherein the frame extends along the edge of the opening and has an H-shaped vertical cross-section in the direction of extension. The H shape has a first recess that opens toward the inside of the opening,
9. The net support structure of claim 8, wherein the support location is configured to support a wire attached to the net inside the first recess. The H shape has a second recess that opens toward the outside of the opening,
10. A net support structure according to claim 8 or 9, wherein the H-shape has a lid portion covering the second recess. 11. The net support structure according to claim 10, wherein the lid portion is provided on the upper side of the frame. The net support structure according to any one of claims 1 to 11, wherein the frame is provided on the outer wall surface of the building so that the inner peripheral side of the frame corresponds to the inner peripheral edge of the opening. The building is a reactor building,
13. The net support structure according to any one of claims 1 to 12 , wherein said net is a protective net for preventing incoming objects from entering said reactor building through said opening. a frame capable of supporting a net for covering the building opening;
anchors for securing the frame to the building;
with
the anchors secure the frame to the building at a support location remote from a load-bearing point of the net on the frame;
the frame extends along the edge of the opening and has an H-shaped vertical cross section in the extending direction;
The H shape has a first recess that opens toward the inside of the opening,
A net support structure, wherein the support location is configured to support a wire attached to the net inside the first recess. a frame capable of supporting a net for covering the building opening;
anchors for fixing the frame to the building via supporting members;
with
the anchors secure the frame to the building at a support location remote from a load-bearing point of the net on the frame;
A method for attaching a net support structure, wherein the anchors are arranged so as to avoid opening reinforcing bars provided in the opening,
attaching the net to the frame;
a step of fixing the support member to the building with the anchor;
transporting the frame with the net attached thereto and attaching it to the support member fixed to the building by the anchor;
A method of installing a net support structure, comprising: a frame capable of supporting a net for covering the building opening;
anchors for fixing the frame to the building via supporting members;
with
the anchors secure the frame to the building at a support location remote from a load-bearing point of the net on the frame;
the frame extends along the edge of the opening and has an H-shaped vertical cross section in the extending direction;
The H shape has a first recess that opens toward the inside of the opening,
The method for attaching a net support structure, wherein the support position is configured to support a wire attached to the net inside the first recess,
attaching the net to the frame;
a step of fixing the support member to the building with the anchor;
transporting the frame with the net attached thereto and attaching it to the support member fixed to the building by the anchor;
A method of installing a net support structure, comprising:

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