Cable rack reinforcement method and reinforcement fixtures

Abstract

To provide a cable rack reinforcement method that prevents deformation and breakage of the cable rack when it moves horizontally during an earthquake. [Solution] A cable rack 1 is supported by hanging bolts P fixed to the frame. The seismic resistance of this cable rack 1 is reinforced with wires W. The wires W are arranged under the cable rack 1. They are connected alternately between opposing parent girders 2 along the longitudinal direction of the cable rack 1. The cable rack 1 comprises two parent girders 2 and multiple child girders 3. The two parent girders 2 are laid in parallel with a gap between them in the direction in which the cable is laid. The multiple child girders 3 are laid with a gap between the parent girders 2 to form a ladder shape.

Description

[Technical Field]

[0001] The present invention relates to a cable rack reinforcing method and reinforcing fixture that prevent cable racks from falling during earthquakes, thereby preventing danger and enabling continued use of equipment. [Background technology]

[0002] In the Tohoku Pacific Ocean Earthquake, there was a lot of damage to electrical main lines and wiring equipment, and it has been reported that damage to cable racks in particular accounted for 68% of the total.

[0003] Patent Document 1 shows a ceiling structure that prevents metal fittings, rough joists, finishing materials, installed objects, etc. supported by ceiling hangers from falling off the hangers in the event of an earthquake.

[0004] This ceiling structure includes a suspension bolt 10 suspended from a frame A, a hanger 30 fixed to the suspension bolt 10, and a pair of left and right wires 140L and 140R connected to the suspension bolt 10 adjacent to the suspension bolt 10 to which the hanger 30 is fixed. A turnbuckle 150 is connected to each of the pair of left and right wires 140L and 140R.

[0005] Meanwhile, Patent Document 2 describes a fall prevention device that prevents a suspended object supported by a suspension bolt extending downward from a structure from falling.

[0006] This fall prevention device has a string-like member 4 made of a metal wire or the like attached to the sling 2 itself, so that even if the sling 2 buckles or breaks in an earthquake, the string-like member 4, such as a wire, can provide a fall prevention effect. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 7001412 [Patent Document 2] Patent No. 6817258 Summary of the Invention [Problem to be solved by the invention]

[0008] The ceiling structure described in Patent Document 1 is configured to suppress the swaying of the hanger 30 by connecting a pair of wires 140L and 140R to the hanging bolt 10 adjacent to the hanging bolt 10 supporting the hanger 30 in order to prevent an object installed on the ceiling from falling off the hanger.

[0009] The pair of left and right wires 140L and 140R are each connected to a turnbuckle 150. The turnbuckles 150 adjust the tension of the pair of left and right wires 140L and 140R so as to attenuate the shaking of the ceiling B when it vibrates.

[0010] That is, the tension of the wires 140L and 140R is adjusted by each turnbuckle 150 so that the hanger 30 does not sway in response to seismic motion. Therefore, adjustment of at least two turnbuckles 150 is required to suppress the sway of one hanging bolt 10, which poses the problem of requiring an extremely large amount of adjustment work.

[0011] On the other hand, the fall prevention device described in Patent Document 2 is configured so that even if a hanging device 2 such as a suspension bolt buckles or breaks during an earthquake, the fall prevention device 7 is supported by a string-like member 4 such as a metal wire to prevent the device from falling. Therefore, depending on the weight of the fall prevention device 7, it may be difficult for the string-like member 4 to support it. Since Patent Document 2 is a measure that assumes that the device will fall, it is desirable to prevent the device from falling in order to increase the continued usability of the building.

[0012] For example, in cable racks in large facilities used for main lines and wiring equipment for electrical equipment, the weight of the cables can reach 200 kg / m or more, so if the suspension bolts buckle or break, it is extremely difficult to support them with string-like members 4 such as metal wires.

[0013] As such, it has been difficult to minimize damage to cable racks with conventional earthquake-resistant structures that adjust a large number of turnbuckles or that deal with situations after suspension bolts buckle and break.

[0014] Furthermore, among the reports that 68% of damage to cable racks occurred during the earthquake, it was confirmed that much of the damage was caused by deformation and breakage of cable racks that occurs when they move horizontally. It was found that these deformations and breakages are the main causes of cable racks and cables falling.

[0015] Therefore, the present invention was created to solve the above-mentioned problems, and aims to provide a cable rack reinforcement method and reinforcing mounting fixtures that increase the earthquake resistance of cable racks by preventing deformation and breakage of the cable rack when it moves horizontally in the event of an earthquake, instead of strengthening the suspension force that supports the cable rack as has been done in the past, thereby preventing it from falling. [Means for solving the problem]

[0016] In order to achieve the above-mentioned object, the first means of the present invention is a cable rack reinforcement method for reinforcing the seismic strength of a structure that supports a cable rack (1) with hanging bolts (P) fixed to a building frame with wires (W), The wires W arranged on the underside of the cable rack 1 are alternately connected between opposing main girders 2 along the longitudinal direction of the cable rack 1.

[0017] In the second means, the cable rack 1 comprises two main girders 2 and a plurality of sub-girders 3, the two main girders 2 being laid in parallel at intervals in the direction in which the cable is laid, and the plurality of sub-girders 3 being laid between the two main girders 2 at intervals in a direction perpendicular to the main girders 2, forming a ladder shape as a whole, and the sub-girders 3 being attached to the lower side of the main girder 2 in the vertical thickness direction, forming a space for placing the cable between the upper surface of the sub-girder 3 and the side surface of the main girder 2, In a rectangular area formed by two sub-girders 3 and a main girder 2 interposed therebetween, the wire W is stretched along the diagonal of the rectangle, and then from the end point of the diagonal in a direction along the sub-girder 3, The wire W is stretched along the underside of the cable rack 1.

[0018] The third means is to similarly stretch the wire W continuously from the rectangular area to the same rectangular area adjacent to the rectangular area.

[0019] The fourth means is a construction method in which the wire W is stretched through wire attachments 10 and 20.

[0020] The cable rack 1 of the fifth means is placed on a support material Q installed below the main girder 2 in a direction perpendicular to the main girder 2.

[0021] The wire W of the sixth means is stretched between the sub-girder 3 of the cable rack 1 and the support material Q.

[0022] The seventh means is a cable rack reinforcing fixture that reinforces the earthquake resistance strength of the cable rack 1 supported by the suspension bolts P fixed to the frame with the wire W and the wire fixture 10, The wire attachment device 10 includes a U-shaped member that can be installed across the sub-girder 3, a main metal fitting 12 having a surface that contacts the main girder 2, and a connecting member that connects the U-shaped member and the main metal fitting 12, By connecting the U-shaped member to the main fittings 12 using the connecting member while it is straddling the sub-girder 33, the wire mounting fixture 10 is fixed to the cable rack 1 while contacting the sub-girder 3 and the main girder 2.

[0023] The eighth means is a cable rack reinforcing fixture that reinforces the earthquake resistance strength of the cable rack 1 supported by the suspension bolts P fixed to the frame with the wires W and the wire fixtures 20, The wire mounting fixture 20 comprises a U-shaped metal fitting 21 that is installed on a support material Q that is installed below the main girder 2 of the cable rack 1 in a direction perpendicular to the main girder 2, and a wire engaging portion 22 that engages the wire W with this U-shaped metal fitting 21. [Effects of the Invention]

[0024] This invention makes it possible to reinforce the cable rack against earthquakes by preventing deformation and breakage of the cable rack when it moves horizontally during an earthquake, preventing the cable rack from falling, preventing human injury, and enabling the continued use of equipment. It is an invention that is particularly effective in resisting shear deformation. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a perspective view showing an example of installation of a cable rack. [Figure 2] 1 shows an example of wire connection according to the present invention, (a) shows the state after connection, and (b) shows the order of connection. [Figure 3] 1 shows another example of wire connection according to the present invention, (a) shows the state after connection, and (b) shows the order of connection. [Figure 4] 1 is a perspective view showing a state in which a wire attaching tool according to a first embodiment of the present invention is in use. [Figure 5] 1 is a side view showing a state in which a wire attaching tool according to a first embodiment of the present invention is in use. [Figure 6] 1 is an exploded perspective view showing a first embodiment of the wire attaching tool of the present invention. [Figure 7] 1 is a side view showing a first embodiment of the wire attaching tool of the present invention. [Figure 8] 1 is a perspective view showing a first embodiment of a wire attaching tool of the present invention. [Figure 9] 1 is a perspective view showing a wire attaching tool according to a first embodiment of the present invention, as seen from the back. [Figure 10] FIG. 10 is a perspective view showing a state in which a wire attaching tool according to a second embodiment of the present invention is in use. [Figure 11] FIG. 10 is a side view showing a state in which a wire attaching tool according to a second embodiment of the present invention is in use. [Figure 12]FIG. 10 is an exploded perspective view showing a second embodiment of the wire attaching tool of the present invention. [Figure 13] FIG. 10 is a side view showing a second embodiment of the wire attaching tool of the present invention. [Figure 14] FIG. 10 is a perspective view showing a second embodiment of the wire attaching tool of the present invention. [Figure 15] FIG. 10 is a perspective view showing a second embodiment of the wire attaching tool of the present invention as seen from the back. [Figure 16] FIG. 10 is a perspective view showing a state in which a wire attaching tool according to a third embodiment of the present invention is in use. [Figure 17] FIG. 10 is a side view showing a state in which a wire attaching tool according to a third embodiment of the present invention is in use. [Figure 18] FIG. 10 is an exploded perspective view showing a third embodiment of the wire attaching tool of the present invention. [Figure 19] FIG. 10 is a side view showing a third embodiment of the wire attaching tool of the present invention. [Figure 20] FIG. 10 is a perspective view showing a third embodiment of the wire attaching tool of the present invention. [Figure 21] FIG. 10 is a perspective view showing a third embodiment of the wire attaching tool of the present invention as seen from the back. [Figure 22] FIG. 10 is a perspective view showing a state in which a wire attaching tool according to a fourth embodiment of the present invention is in use. [Figure 23] FIG. 10 is a side view showing a state in which a wire attaching tool according to a fourth embodiment of the present invention is in use [Figure 24] FIG. 10 is an exploded perspective view showing a fourth embodiment of the wire attaching tool of the present invention. [Figure 25] FIG. 10 is a side view showing a fourth embodiment of the wire attaching tool of the present invention. [Figure 26] FIG. 10 is a perspective view showing a fourth embodiment of the wire attaching tool of the present invention. [Figure 27] FIG. 10 is a perspective view showing a wire attaching tool according to a fourth embodiment of the present invention, as seen from the back. [Figure 28] FIG. 1 is a perspective view of a bearing used in the wire attachment of the present invention. [Figure 29] FIG. 10 is a side view showing another aspect of the wire attaching tool according to the fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention relates to a reinforcing method and reinforcing fixture for reinforcing with wire W the earthquake resistance strength when a cable rack 1 is supported by a suspension bolt P fixed to a frame.

[0027] The cable rack 1 is a cable support material made up of a ladder-like configuration of main girders 2 and sub girders 3, and the longitudinal ends of the main girders 2 can be connected with rack joint fittings 4. To support the cable rack 1 on the suspension bolts P, a support material Q is connected to the bottom of the suspension bolts P, and the cable rack 1 is then placed and fixed on top of this support material Q (see Figure 1).

[0028] That is, the cable rack 1 comprises two main girders 2 and multiple sub-girders 3, and the two main girders 2 are laid parallel to each other at intervals in the direction in which the cables are laid. Furthermore, multiple sub-girders 3 are laid between the two main girders 2 at intervals in a direction perpendicular to the main girders 2, forming a ladder-like structure as a whole. The sub-girders 3 are attached to the lower side of the main girder 2 in the vertical direction, and a space for placing the cables is formed between the top surface of the sub-girders 3 and the side of the main girder 2 (see Figure 1).

[0029] The reinforcement method of the present invention uses wires W arranged under the cable rack 1 (see Figure 2). The wires W are alternately connected between opposing parent girders 2 along the longitudinal direction of the cable rack 1. For example, as shown in Figure 2(A) and Figure 3(A), the wires W are arranged in two wiring patterns that are rotated 180 degrees around the midline between the two parent girders as the axis of rotation.

[0030] The deformation of the cable rack 1 consists of shear deformation and bending deformation. Until now, it was thought that the deformation of the cable rack 1 was due to bending deformation, but the inventor's research has revealed that shear deformation is the dominant basic characteristic of the deformation state of the cable rack 1. Experiments have shown that shear deformation occurs in the horizontal structure when the cable rack 1 swings sideways during seismic motion. It has been proven that by stretching wire W on the cable rack 1 and reinforcing it so that a tensile force is applied to the cable rack 1 in the horizontal direction, it is possible to easily increase the strength of the horizontal structure.

[0031] Therefore, in the present invention, in order to effectively reinforce the horizontal structural surface of the cable rack 1 using wire W, the wire W is arranged on the underside of the cable rack 1 and is alternately connected so that the wire W crosses between opposing parent girders 2 along the longitudinal direction of the cable rack 1 (see Figure 2).

[0032] That is, in a rectangular area formed by two sub-girders 3 and the main girder 2 interposed between them, the wire W is stretched along the diagonal of the rectangle, and then from the end point of the diagonal toward the main girder 2 on the opposite side (see Figure 2).

[0033] The wire W shown in Figure 2 is connected between the parent girders 2 in a zigzag pattern (see Figure 2 (A)). This wire W is arranged diagonally from one parent girder 2 to the other parent girder 2 (see Figure 2 (B)). That is, in a rectangular area formed by two child girders 3 and the parent girder 2 interposed between them, the wire W is connected to the parent girder 2 along the diagonal of the rectangle, and then the wire W is stretched to the parent girder 2 on the opposite side along the diagonal of the adjacent rectangular area, thereby forming a V-shaped wiring. Furthermore, the wire W is arranged in a pattern that is rotated 180 degrees around the midpoint of the two parent girders 2 as the axis of rotation.

[0034] On the other hand, the wire W shown in Figure 3 is laid diagonally from one parent girder 2 to the other parent girder 2, and then wired along the child girder 3 (see (A) in the same figure). In other words, the wire W is connected diagonally from one parent girder 2 to the other parent girder 2, then changes direction and is wired along the child girder 3, and after connecting to the opposing parent girder 2, the wire W is again stretched diagonally in the adjacent rectangular area, and is wired in an N-shape (see (B) in the same figure). Furthermore, the wire W is wired in a pattern that is rotated 180 degrees around the midline of the two parent girders 2 as the axis of rotation. When the wire W is routed as shown in FIG. 3, it is possible to more effectively resist shear deformation than the wire routing pattern shown in FIG.

[0035] In this case, in addition to connecting from one parent girder 2 to the other parent girder 2 along the child girder 3, it is also possible to wire along the support material Q. In the illustrated example, wiring is performed in the area where the child girder 3 and the support material Q overlap (see Figure 3). Also in this example, the wiring pattern is changed with the support material Q at the longitudinal center of the cable rack 1 as the boundary (see Figure (b)). In other words, the wiring pattern is line-symmetric with the support material Q at the longitudinal center as the boundary. Note that the wiring pattern may also be point-symmetric with respect to the center point of the rectangular area formed by two adjacent support materials Q and the parent girder 2 interposed between them.

[0036] The wires W are fixed at intervals of 1500 mm, with wire diameters of 2.0 mm and 3.0 mm. These intervals and diameters can be freely changed depending on the size of the cable rack 1 used or the material of the wire W. The number of sub-girders 3 across which the rectangular area is defined and the wires W routed diagonally can be varied as needed. The combination method can also be varied as needed, such as combining different wiring patterns. When combining wiring patterns, it is preferable to change the wiring pattern at the seismic support. It is also preferable not to route a single cable beyond the midpoint between one seismic support and the next. Here, seismic support is a support method defined in the "Guidelines for Seismic Design and Construction of Design Facilities" published by the Building Center of Japan. It is a support method that has the strength to withstand earthquakes by firmly fixing the structure and cable rack with steel materials and vibration braces.

[0037] A wire fixture is used to connect the wire W. The wire fixtures of the present invention include a Type A wire fixture 10 that is fixed to the cable rack 1 (see Figures 4 to 16), and Type B wire fixtures 20 and 30 that are fixed to the support material Q (see Figures 17 to 26).

[0038] (Type A wire attachment) Next, we will explain the Type A wire attachment 10. This wire attachment 10 is a wire attachment 10 that secures the cable rack 1 from the sub-girder 3 to the main girder 2, and includes a U-shaped member, a main fitting 12, and a connecting member, and is fixed to the cable rack 1 in a state where the U-shaped member is straddling the sub-girder 3 (see Figures 4 and 10). Here, the straddling state is preferably a state where the U-shaped member is abutting against both side surfaces and the top surface of the sub-girder 3 from above. The U-shaped member may be a member with a circular or rectangular cross section in the longitudinal direction.

[0039] Then, a connecting member is screwed to the end of the U-shaped member protruding from the underside of the main metal fitting 12. As a result, the wire attachment device 10 is fixed to the underside of the cable rack 1 while contacting the sub-girder 3 and main girder 2 (see Figures 5 and 11). At this time, the wire W is fixed along the underside of the cable rack 1, so at the position where the support material Q that supports the cable rack 1 is located, the wire W is arranged along the upper surface of this support material Q. In other words, since there is a gap between the support material Q and the cable rack 1 that is the thickness of the main girder 3, the wire W is passed through this gap between the underside of the cable rack 1 and the upper surface of the support material Q. It is also possible to increase the wire diameter by inserting a plate depending on the wire diameter.

[0040] Example 1 The wire attachment 10 shown in Figs. 4 to 9 uses a U-bolt 11 as a U-shaped member (see Fig. 6). The metal fitting 12 has a pair of insertion holes 12A through which the ends of the U-bolt 11 are inserted, and a hexagonal nut 13 is used as the connecting member. The hexagonal nut 13 is screwed onto the U-bolt 11 with a spacer 14 interposed between the underside of the metal fitting 12 and the hexagonal nut 13. The spacer 14 forms a groove-like recess between the underside of the metal fitting 12 and the hexagonal nut 13, and the wire W is engaged in the recess of the spacer 14 (see Fig. 7).

[0041] It is also possible to use a bearing Y instead of the spacer 14 (see FIG. 28). This bearing Y reduces friction of the wire W, making installation of the wire W smoother. Also, the illustrated guide Y1 prevents the wire W from coming off. This guide Y1 is made of metal, resin, or the like.

[0042] The main metal fitting 12 has opposing side edges bent upward to form a pair of bent portions 12B, and a notched groove 12C is formed in the longitudinal center of each bent portion 12B (see FIG. 6). When the sub-girder 3 is fitted into this groove 12C, one bent portion 12B stands upright on the side surface of the sub-girder 3, and the other bent portion 12B stands upright along the outer surface of the main girder 2 (see FIG. 9). As a result, the main metal fitting 12 is fixed in contact with the sub-girder 3 and the main girder 2, and the wire mounting fixture 10 is fixed to the cable rack 1 together with the U-bolt 11 connected to the main metal fitting 12 (see FIG. 8).

[0043] At this time, the wire W is engaged between the underside of the main metal fitting 12 and the hexagonal nut 13, which is a connecting member. Preferably, a spacer 14 is interposed between the underside of the main metal fitting 12 and the hexagonal nut 13, and the wire W is engaged therewith. In order to engage the wire W with the spacer 14, it is necessary to select a size in which the outer diameter of the spacer 14 is smaller than the width of the hexagonal nut and the plate thickness of the spacer 14 is larger than the diameter of the wire W.

[0044] In the illustrated example, the width of the groove 12C on the sub-girder 3 side is made wider than the width of the groove 12C on the main girder 2 side, but it is also possible to make the widths of both grooves 12C the same. Also, the groove 12C on the side of the main girder 2 can be omitted, and the shape of the main metal fitting 12 can be changed as desired.

[0045] Example 2 The wire fixture 10 shown in Figures 10 to 15 uses a modified U-bolt 15 as a U-shaped member (see Figure 10). This modified U-bolt 15 has a horizontal portion 15A formed by bending the end of the U-bolt that straddles the sub-girder 3 horizontally (see Figure 12).

[0046] The main body metal fitting 16 connected to this deformed U-bolt 15 is a plate-like member that contacts the outer surface of the main girder 2 and has a pair of insertion holes 16A through which the ends of the deformed U-bolt 15 are inserted (see Figure 12). Furthermore, the lower end of the main body metal fitting 16 is bent upward to form a bent portion 16B that abuts against the underside of the main girder 2 (see Figure 13). Note that the bent portion 16B may be bent to a position that abuts against the underside of the sub-girder 3. Furthermore, a pair of grooves 16C are formed in this bent portion 16B through which both ends of the deformed U-bolt 15 are inserted (see Figure 12).

[0047] Then, a deformed U-bolt 15 is placed across the sub-girder 3, and the horizontal portion 15A is inserted into the main body metal fitting 16 that is in contact with the outer surface of the main girder 2, and they are connected with a hexagonal nut 17 (see Figure 13). At this time, the tip of the bent portion 16B is in contact with the underside of the main girder 2 and the sub-girder 3, thereby stabilizing the main body metal fitting 16.

[0048] The wire W directly engages with the modified U-bolt 15 and is disposed on the underside of the cable rack 1 (see Figure 11). In other words, the wire W engages with the underside of the modified U-bolt 15, straddling the sub-girder 3. Preferably, the wire W engages with the bent portion toward the horizontal section 15A. In this way, the wire mounting fixture 10 is fixed directly to the main girder 2 and sub-girder 3 of the cable rack 1, thereby providing a strong fixing force (see Figures 14 and 15).

[0049] As illustrated in Examples 1 and 2 above, Type A wire mounting fixture is a wire mounting fixture that is fixed from the main girder 2 to the sub girder 3 of the cable rack 1 and is used to arrange the wire W under the cable rack.

[0050] (Type B wire attachment) Next, we will explain the type B wire attachments 20 and 30 that are fixed to the support material Q. These wire attachments 20 and 30 are used to fix the cable rack 1 from the support material Q on which the cable rack 1 is placed and fixed (see FIGS. 16 and 22).

[0051] The support material Q is a lip-channel steel support member, and is used with its opening, which has a lip Q1, facing downward (see Figures 16 and 22). The sub-girder 3 is a lip-channel steel support member that is thinner than the support material Q, and is used with its opening, which has a lip 3A, facing upward. The wire W is then engaged with the wire fixtures 20, 30 protruding from the underside of the support material Q, and the wire W is routed under the cable rack 1 (see Figures 17 to 23).

[0052] Example 3 The wire fixture 20 shown in FIGS. 16 to 21 is used to fix from the lower surface of the support material Q to the upper surface of the sub-girder 3.

[0053] The illustrated wire attachment 20 has bent portions 21B and 21C formed above and below a pair of U-shaped metal fittings 21, each forming an insertion opening 21A. Then, bent portions 21B and 21C are stacked and fixed with hexagon bolts 22 and pan head screws 26 (see Figures 18 and 20).

[0054] After passing through the hexagonal nut 23, the hexagonal bolt 22 is inserted from below into the insertion opening 21A of the lower bent portion 21B and connected to the middle nut 24, and then abuts against the inner top plate of the support material Q (see Figure 20). On the other hand, the pan head screw 26 is inserted from above into the insertion opening 21A of the upper bent portion 21C and connected to the middle nut 25, and then abuts against the inner bottom surface of the sub-girder 3.

[0055] In this wire mounting fixture 20, the portion fixed to the underside of the support material Q is the lower bent portion 21B of the U-shaped metal fitting 21, which abuts against the bottom surface of the support material Q (see Figure 19). Then, the upper bent portion 21C is engaged with the upper surface of the sub-girder 3 and fixed with a hexagon bolt 22, a middle nut 24, and a hexagon nut 23. At this time, the middle nut 24 is engaged with the inner lip Q1 of the support material Q (see Figure 20).

[0056] Additionally, the portion of the wire mounting fixture 20 that is fixed to the top surface of the sub-girder 3 has the upper bent portion 21C of the U-shaped metal fitting 21 abut against the top surface of the sub-girder 3 and fixed with a pan head screw 26 and a middle nut 25 (see Figure 21). This middle nut 25 engages with the inside of the lip 3A on the top side of the sub-girder 3, and connects the pan head screw 26 that passes through the bent portion 21C of the U-shaped metal fitting 21 that is placed on the top surface of the sub-girder 3.

[0057] Furthermore, an L-shaped bracket 27 is provided on the top surface of the support material Q to abut against the outer surface of the main girder 2, and is fixed to the support material Q with a hexagon bolt 28 (see Figure 19). Note that when fixing the L-shaped bracket 27, it is necessary to drill a hole in the support material Q in advance through which the hexagon bolt 28 can pass. Therefore, this wire mounting fixture 20 has an extremely strong fixing force due to the U-shaped bracket 21 that fixes from the bottom surface of the support material Q to the top surface of the main girder 2, and the L-shaped bracket 27 that fixes from the top surface of the support material Q to the outer surface of the main girder 2. In this state, the wire W is engaged with the side of the hexagon bolt 22 protruding from the bottom surface of the support material Q.

[0058] Example 4 The wire fixture 30 shown in Figures 22 to 27 is a wire fixture 30 that fixes from the underside of the support material Q to the upper surface of the main girder 2. The illustrated wire fixture 30 comprises a main body metal fitting 31 that fixes to the underside of the support material Q, and a crank metal fitting 34 that fixes from the upper surface of the support material Q to the upper end of the main girder 2 (see Figure 25). Furthermore, an eye nut 32 that connects to the side of the main body metal fitting 31 is provided, and the wire W is engaged with this eye nut 32.

[0059] The illustrated main body metal fitting 31 is a fixing member made by bending a metal plate into a box shape, with an insertion hole 31A formed on the top surface. An inner nut 36 is placed on the top of this main body metal fitting 31, and a hexagonal bolt 35 inserted into the insertion hole 31A from above is fixed to the inner nut 36 (see Figure 24). Furthermore, a screw hole 31B is formed on the side of the main body metal fitting 31, and an eye nut 32 is fixed with a hexagonal bolt 33 inserted into this screw hole 31B.

[0060] A pair of bent pieces 31C are erected on the upper surface of the main body metal fitting 31. These bent pieces 31C are inserted into the downward opening of the support material Q (see Figure 26). At this time, both ends of the bent pieces 31C are inclined and come into contact with the lip Q1 of the support material Q, preventing the main body metal fitting 31 from shifting out of position. It is necessary to pre-form holes in the main girder 2 to pass the pan head screws 37 through.

[0061] Crank fitting 34 is a connecting member having a locking piece 34B and a mounting piece 34C at the ends of a band-shaped fitting facing in opposite directions, and has an insertion hole 34A formed in the longitudinal center (see Figure 24). Then, a pan head screw 37 is inserted into this insertion hole 34A from the inside of the main girder 2, and a flange nut 38 is connected to the pan head screw 37, thereby fixing crank fitting 34 to the main girder 2.

[0062] At this time, the upper locking piece 34B is locked to the upper end of the main girder 2, and the lower mounting piece 34C is placed on the top surface of the support material Q and fixed with a hex bolt 35 (see Figure 25). This hex bolt 35 is screwed from the mounting piece 34C through the support material Q to the middle nut 36 (see Figure 24). Therefore, this wire mounting fixture 30 arranges the wire W in the eye nut 32 while being fixed from the support material Q to the outer surface of the cable rack 1 (see Figure 25). Note that a hole to pass the hex bolt 35 through must be made in advance in the support material Q.

[0063] Next, the insertion hole 31A of the main body metal fitting 31 is inserted into the hexagon bolt 35 protruding from the underside of the support material Q, and the main body metal fitting 31 is fixed with the hexagon nut 40. Therefore, this wire attachment tool 30 arranges the wire W in the eye nut 32 while being fixed from the support material Q to the outer surface of the cable rack 1 (see Figure 25).

[0064] As illustrated in Examples 3 and 4 above, the Type B wire attachment fixture is a wire attachment fixture that is fixed from the cable rack 1 to the support material Q and is used to arrange the wire W below the cable rack 1.

[0065] In the above-mentioned Examples 3 and 4, the wire is routed below the support material, but it may be routed between the cable rack and the support material. For example, a pair of washers 39 may be placed between the mounting piece 34C of the hexagon bolt 35 and the support material Q, and the wire W may be locked between these washers 39 (see FIG. 29). In this case, the eye nut 32 is not necessary.

[0066] In the above-mentioned Examples 3 and 4, lip channel steel is used as the support material, but other steel materials such as angle steel can also be used as the support material.

[0067] The spacer 14, bearing Y, and guide 1 can also be used in the construction example of Example 3 and FIG. [Explanation of symbols]

[0068] P Hanging bolt Q Support material Q1 Rib W Wire Y bearing Y1 Guide 1 cable rack 2 Parent digits 2A Rib 3 Sub-digits 3A Lip 4 Rack joint fittings 10 Wire fitting Example 1 11 U-bolts 12 Main body fittings 12A insertion port 12B Bend part 12C Groove 13 Hexagon nut 14 spacer Example 2 15 Deformed U-bolt 16 Main body fittings 16A Insertion port 16B Bend part 16C Groove 17 Hexagon nut 20 Wire fitting Example 3 21 U-shaped metal fittings 21A Insertion port 21B Bend part 21C Bend part 22 hex bolt 23 Hexagon nut 24 Middle nut 25 Middle nut 26 Pan head screw 27 L-shaped bracket 27A Insertion port 28 hex bolt 29 Hexagon nut Example 4 30 Wire attachment 31 Main body fittings 31A Insertion port 31B screw hole 31C bending piece 32 Ainat 33 Hexagon bolt 34 Crank fittings 34A Insertion port 34B Locking piece 34C Mounting piece 34D Insertion port 35 hex bolt 36 Middle nut 37 Pan head screw 38 flange nut 39 Washer 40 hexagon nut

Claims

1. A cable rack reinforcement method that uses wires to reinforce the seismic strength of a structure that supports a cable rack with hanging bolts fixed to a main body, characterized in that the wires arranged on the underside of the cable rack are alternately connected between opposing parent girders along the longitudinal direction of the cable rack.

2. The cable rack comprises two main girders and a plurality of sub-girders, the two main girders being laid parallel to each other at intervals in the direction in which the cables are laid, and the plurality of sub-girders being laid between the two main girders at intervals in a direction perpendicular to the main girders, forming a ladder shape as a whole, and the sub-girders being attached to the lower side of the main girder in the vertical thickness direction, forming a space for placing the cables between the upper surface of the sub-girders and the side surface of the main girder, In a rectangular area formed by two sub-girders and a main girder interposed between them, a wire is stretched along the diagonal of the rectangle, and then from the end point of the diagonal in a direction along the sub-girder, 2. The cable rack reinforcing method according to claim 1, wherein the wire is stretched along the underside of the cable rack.

3. 3. A cable rack reinforcing method according to claim 1 or 2, wherein wires are strung in the same rectangular area adjacent to and continuing from the rectangular area of ​​the cable rack.

4. The cable rack reinforcing method according to claim 1 or 3, wherein the wires are tensioned via wire fixtures.

5. 5. A cable rack reinforcement method according to claim 1, wherein the cable rack is placed on a support material installed below the main girder in a direction perpendicular to the main girder.

6. The cable rack reinforcing method according to claim 5, wherein the wire is stretched between the sub-girder of the cable rack and the support material.

7. A cable rack reinforcing fixture that reinforces the seismic strength of a cable rack supported by hanging bolts fixed to a building frame with a wire and a wire fixture, The wire attachment device includes a U-shaped member that can be installed across the sub-girder, a main metal fitting having a surface that contacts the main girder, and a connecting member that connects the U-shaped member and the main metal fitting, A cable rack reinforcing fixture characterized in that the U-shaped member is placed across the sub-girder and connected to the main metal fitting by the connecting member, thereby fixing the wire mounting fixture to the cable rack while contacting the sub-girder and the main girder.

8. A cable rack reinforcing fixture that reinforces the seismic strength of a cable rack supported by hanging bolts fixed to a building frame with a wire and a wire fixture, The wire mounting fixture is a cable rack reinforcement mounting fixture characterized by comprising: a U-shaped metal fitting that is installed on a support material installed below the main beam of the cable rack in a direction perpendicular to the main beam; and a wire engaging portion that engages the wire with this U-shaped metal fitting.

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