Maintenance methods for fixed structures

Abstract

The present invention provides a fixing structure that can prevent damage to nuts that are fixed in a way that prevents them from being removed during adjustment or maintenance of the object to be fixed, a method for manufacturing a base member used in the fixing structure, and a method for maintaining the fixing structure. [Solution] The fixing structure 1 is a fixing structure 1 for fixing an object to be fixed 4 to a base member 2, and comprises a first nut 5 which is irreversibly fixed to the base member 2 in advance, a threaded rod 6 which is screwed onto the first nut 5 and has one end protruding from the first nut 5, the object to be fixed 4 which has an insertion hole 40 into which the threaded rod 6 is inserted from its protruding end 61, and a second nut 7 which is screwed onto the threaded rod 6, wherein the second nut 7 presses the object to be fixed 4 against the first nut 5 side and fixes it.

Description

Technical Field

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[0001] The present invention relates to a fixing structure, a method for manufacturing a base member used in the fixing structure, and a maintenance method for the fixing structure.

Background Art

[0002] Conventionally, when molding a concrete member such as an outer wall member made of concrete, an insert nut is previously embedded in the concrete member, placed and cured, and a bolt is screwed into the insert nut to fix a fitting for fixing the concrete member to the building frame to the outer wall member (for example, Patent Document 1).

[0003] Also, in a concrete member such as a foundation, a part may be protruded and an anchor bolt may be embedded, and another member to be fixed may be joined using the anchor bolt and a nut.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When fixing by screwing a bolt into a insert nut, when removing a fixing object such as a fitting due to the need for adjustment or maintenance, etc., the bolt screwed into the insert nut is rotated in the loosening direction to remove the bolt, and then the fixing object is removed. Therefore, when frequent adjustment or maintenance of the fixing object is required, problems such as damage to the insert nut itself may occur when removing the bolt.

[0006] Furthermore, when anchoring an object by screwing a nut onto an anchor bolt, removing the object requires loosening the nut, removing it from the anchor bolt, and then removing the object. Therefore, if the object requires frequent adjustment or maintenance, there is a risk of the anchor bolt being damaged when removing the nut.

[0007] Furthermore, since insert nuts and anchor bolts are embedded in concrete, it is difficult to replace only the insert nut or anchor bolt if it is damaged.

[0008] Therefore, the present invention aims to provide a fixing structure that can prevent damage to nuts that are fixed in a way that prevents them from being removed during adjustment or maintenance of an object to be fixed, a method for manufacturing a base member used in the fixing structure, and a method for maintaining the fixing structure. [Means for solving the problem]

[0009] The first fixing structure for solving the above problems is a fixing structure for fixing an object to be fixed to a base member, comprising: a first nut irreversibly fixed to the base member in advance; a threaded rod screwed onto the first nut with one end protruding from the first nut; the object to be fixed having an insertion hole into which the threaded rod is inserted from its protruding end; and a second nut screwed onto the threaded rod, wherein the second nut presses the object to be fixed against the first nut side to fix it.

[0010] The second invention relates to the fixing structure of the first invention, wherein the threaded rod has a protruding end that does not interfere with the screwing of the second nut, and has an operating part that allows the threaded rod to be rotated in the tightening and loosening direction.

[0011] The third invention further comprises a restricting portion in the fixing structure of the first or second invention, which contacts the end of the threaded rod opposite to the protruding end, thereby restricting the movement of the threaded rod toward the opposite side.

[0012] The fourth invention is a fixing structure of the first to third inventions, wherein the base member is made of concrete, and the first nut is fixed by being embedded in the base member.

[0013] The fifth invention relates to the fixing structure of the first to fourth inventions, wherein the base member is made of steel, and the first nut is fixed by welding to the base member.

[0014] The sixth invention is a method for manufacturing a base member to be used in any of the first to fourth fixing structures, comprising the steps of: placing the first nut at a predetermined position in a formwork that forms the base member; screwing the threaded rod into the first nut; pouring concrete into the formwork after the first nut has been placed and the threaded rod has been screwed into the first nut, thereby embedding the first nut in the concrete; and curing the concrete and demolding to obtain the base member.

[0015] The seventh invention is a maintenance method for maintaining any of the first to fifth fixing structures, comprising the steps of: rotating the second nut in the loosening direction to remove it from the threaded rod; removing the object to be fixed from the threaded rod; operating the operating part of the threaded rod to loosen the threaded rod and remove it from the first nut; replacing or repairing the second nut, the object to be fixed, and the threaded rod as necessary; screwing the threaded rod onto the first nut; inserting the threaded rod into the insertion hole of the object to be fixed; and screwing the second nut onto the threaded rod and pressing the object to be fixed against the first nut to fix it. [Effects of the Invention]

[0016] According to the fixing structure of the first invention, a threaded rod is screwed onto a first nut irreversibly fixed to a base member, and an object to be fixed, which has an insertion hole into which the threaded rod is inserted, is pressed against the first nut by a second nut screwed onto the threaded rod to fix it in place. Therefore, when maintaining the object to be fixed, the object can be removed and replaced or maintained by removing the second nut from the threaded rod, preventing damage to the first nut, which is irreversibly fixed to the base member. On the other hand, if the threaded rod is damaged during replacement or maintenance of the object to be fixed, it can be removed from the first nut and replaced, eliminating the need to replace the entire base member and improving maintainability.

[0017] According to the fixing structure of the second invention, the threaded rod has an operating part formed on its protruding end that does not interfere with the screwing of the second nut and allows the threaded rod to be rotated in the tightening and loosening direction. Therefore, the threaded rod can be easily rotated, and the work of removing the threaded rod from the first nut can be easily performed.

[0018] According to the fixing structure of the third invention, the restricting part abuts against the end of the threaded rod opposite to the protruding end, restricting the movement of the threaded rod to the other side. This allows the threaded rod to be held in an appropriate position without being inserted too far into the first nut. Furthermore, it prevents the threaded rod from rotating when the second nut is removed from it.

[0019] According to the fixing structure of the fourth invention, the base member is made of concrete, and the first nut is fixed by being embedded in the base member. Therefore, the object to be fixed is fixed by the threaded bolt to which the first nut is screwed and the second nut that is screwed onto the threaded bolt. When replacing or maintaining the object to be fixed, only the screwing of the threaded bolt and the second nut needs to be released, so there is no risk of damaging the first nut. As the first nut embedded in the concrete is less likely to be damaged, the occurrence of problems that would necessitate replacing the base member itself can be suppressed.

[0020] According to the fixing structure according to the fifth invention, since the base member is a steel member and the first nut is welded to the steel member, the object to be fixed is fixed by the slotted bolt to which the first nut is screwed and the second nut screwed to the slotted bolt. Therefore, when replacing or maintaining the object to be fixed, only the screwing of the slotted bolt and the second nut needs to be released, so there is no risk of damaging the first nut, and the welded first nut is less likely to be damaged, suppressing the occurrence of problems such that the steel member itself has to be replaced.

[0021] According to the manufacturing method of the base member according to the sixth invention, after screwing a slotted bolt to the first nut arranged at a predetermined position of the mold, concrete is placed in the mold, so it is possible to prevent the concrete from flowing into the screw hole of the first nut, and the concrete placing process can be easily and appropriately constructed.

[0022] According to the maintenance method according to the seventh invention, when replacing the slotted bolt due to damage to the slotted bolt or the like, after removing the second nut and the object to be fixed from the slotted bolt, the slotted bolt can be removed from the first nut by operating the operation part of the slotted bolt. For example, compared with fixing means such as anchor bolts that cannot be replaced, the maintainability is improved. Also, since the second nut and the object to be fixed are fixed by the slotted bolt, the first nut that is difficult to remove from the base member is less likely to be damaged, so it is possible to avoid as much as possible a situation where a major maintenance such as replacing the base member itself is required.

Brief Description of the Drawings

[0023] [Figure 1] Cross-sectional view for explaining the configuration of the fixing structure of the first embodiment. [Figure 2] Cross-sectional view for explaining the construction method of the fixing structure of the first embodiment. [Figure 3] Perspective view for explaining the configuration of the slotted bolt, (A) shows a slotted bolt with a split formed at the protruding end, (B) shows a slotted bolt with a hexagonal hole formed at the protruding end, and (C) shows a slotted bolt with a hexagonal column formed at the protruding end. [Figure 4] It is a view for explaining a construction method of an outer wall material as a base member. (A) shows a state where a first nut is disposed at a predetermined position of a formwork, and (B) is a cross-sectional view showing a state where concrete is placed in the formwork. [Figure 5] It is a view for explaining a construction method of an outer wall material as a base member. (C) shows a state where the concrete placed in the formwork is being cured, and (D) is a cross-sectional view showing a state where the formwork is removed and the outer wall material as a base member is completed. [Figure 6] A cross-sectional view for explaining a maintenance method of the fixing structure of the first embodiment. [Figure 7] An exploded perspective view for explaining a modification example of the fixing structure of the first embodiment. [Figure 8] A cross-sectional view for explaining the configuration of the fixing structure of the second embodiment. [Figure 9] A perspective view for explaining a construction method and a maintenance method of the fixing structure of the second embodiment. [Figure 10] An exploded perspective view for explaining a modification example of the fixing structure of the second embodiment.

Mode for Carrying Out the Invention

[0024] 〔First Embodiment〕 Hereinafter, a first embodiment of the fixing structure 1 of the present invention, a manufacturing method of a base member, and a maintenance method of the fixing structure will be described with reference to FIGS. 1 to 7.

[0025] <Fixing Structure of the First Embodiment> As shown in FIG. 1, the fixing structure 1 of the first embodiment is for fixing an outer wall material 2a as a base member to a foundation top end 3, and fixes an outer wall fixing fitting 4a as a fixing object 4 to the outer wall material 2a. The fixing structure 1 of the present embodiment includes a base member 2, a first nut 5 that is irreversibly fixed to the base member 2, a split bolt 6 that is screwed onto the first nut 5 and protrudes from the first nut 5 to one side, a fixing object 4 having an insertion hole 40 into which the split bolt 6 is inserted, and a second nut 7 that is screwed onto the split bolt 6 to fix the fixing object 4.

[0026] In this invention, "irreversibly fixed" means that once fixed, the first nut 5 cannot be removed from the base member 2 without destroying the base member 2 or melting the metal.

[0027] The base member 2 is a concrete member formed by pouring concrete into the formwork 20. As described above, the base member 2 in this embodiment is specifically an exterior wall material 2a. Reinforcing bars 21 are embedded inside the base member 2. However, the configuration is not limited to the base member 2 having reinforcing bars 21 embedded inside. Also, a first nut 5 is embedded in the base member 2. The end of the first nut 5 on the back side of the base member 2 is exposed and is open on the back side of the base member 2. The base member 2 is not limited to an exterior wall material 2a, but may be a concrete member such as a floor slab. Furthermore, the "base member" in this invention is not limited to a concrete member, but may be a steel member such as a steel structural frame or a steel base material for interior finishing, as will be described later.

[0028] The first nut 5 is a nut embedded in the base member 2 and is a cap nut formed by closing one end. The closed portion of the first nut 5 is a restricting portion 50 that restricts the threaded rod 6 from moving further in the fastening direction of the first nut 5 when the threaded rod 6 is screwed into the first nut 5, by causing the protruding end 61 of the threaded rod 6 and the end opposite to it to abut inside the first nut 5. By restricting the threaded rod 6 from moving more than necessary in the fastening direction with this restricting portion 50, the threaded rod 6 can be held in the appropriate position. In addition, it is possible to prevent the threaded rod 6 from rotating together when screwing the second nut 7 onto or loosening the threaded rod 6.

[0029] Furthermore, the first nut 5 is not limited to a cap nut, but may be a through nut. Also, the restricting portion 50 does not have to be the closed part of the cap nut, and may be, for example, a separate structure from the first nut 5 that can restrict the movement of the threaded rod 6 in the fastening direction.

[0030] The threaded rod 6 has a threaded portion 60 formed along its entire length in the longitudinal direction. One end of the threaded rod 6 abuts against a restricting portion 50 inside the first nut 5, and the other end of the threaded rod 6 is a protruding end 61 that protrudes from the first nut 5. An operating portion 62 is formed on the protruding end 61, which allows the threaded rod 6 to be rotated in both the tightening and loosening directions. The operating portion 62 is formed radially inward from the root diameter of the threaded portion 60, and when the second nut 7 is inserted into the threaded rod 6, the threaded hole of the second nut 7 is larger than the operating portion 62, so the second nut 7 can be screwed onto the threaded rod 6 without interference from the operating portion 62.

[0031] The operating part 62 is, for example, a slot formed on the protruding end 61 of the threaded rod 6, as shown in Figure 3(A). If it is a slot, a flathead screwdriver can be inserted into the operating part 62 to rotate the threaded rod 6 in the tightening and loosening directions. The operating part 62 is not limited to a slot, but may also be a Phillips head groove formed on the protruding end 61. Furthermore, the operating part 62 may be a hexagonal socket or hexagonal prism projection that can be operated with a spanner or wrench, as shown in Figures 3(B) and 3(C). The shape of the operating part 62 is not limited to these, and any shape that allows the threaded rod 6 to be rotated in the tightening and loosening directions by a tool is acceptable.

[0032] In this way, the threaded rod 6 has an operating part 62 formed on its protruding end 61 that does not interfere with the screwing of the second nut 7, and that allows the threaded rod 6 to be rotated in the tightening and loosening direction. This makes it easy to rotate the threaded rod 6 and to remove it from the first nut 5.

[0033] In this embodiment, the object to be fixed 4 is the exterior wall fixing bracket 4a. More specifically, it is a bracket that fixes the lower end of the exterior wall material 2a to the top of the foundation 3. The exterior wall fixing bracket 4a, which is the object to be fixed 4, has a flat plate portion 41 that abuts against the back surface of the exterior wall, a locking portion 42 that hooks onto the channel steel 34 formed on the top of the foundation 3, a rib 43 that reinforces the flat plate portion 41, and an insertion hole 40 into which a threaded rod 6 is inserted. The insertion hole 40 is an elongated hole that is long vertically, allowing the position of the exterior wall fixing bracket 4a, which is fixed to the back surface of the exterior wall material 2a as the base member 2, to be adjusted vertically.

[0034] The second nut 7 is a through nut with a diameter that allows it to be screwed onto the threaded rod 6. The threaded rod 6 is inserted through the insertion hole 40 of the exterior wall fixing bracket 4a, then inserted into the central hole of the washer 63, and finally the second nut 7 is screwed onto the threaded rod 6. When the second nut 7 is tightened, the exterior wall fixing bracket 4a is pressed against the back surface of the exterior wall material 2a.

[0035] An anchor bolt 31 is embedded in the top surface 3 of the foundation so as to protrude upward, and the plate 33 is fixed to the anchor bolt 31 with a fixing nut 32 that is screwed onto the anchor bolt 31. A channel steel 34 is positioned on the plate 33 with two flanges horizontally aligned vertically, and the lower flange is welded to the plate 33. The locking portion 42 of the exterior wall fixing bracket 4a, which is pressed against the back surface of the exterior wall material 2a by the second nut 7, locks onto the upper flange of the channel steel 34, thereby fixing the lower end of the exterior wall material 2a to the top surface 3 of the foundation.

[0036] <Construction method for fixed structures> When constructing the fixed structure 1 as described above, as shown in Figure 2, first, the plate 33 is fixed to the anchor bolt 31 provided on the top surface of the foundation 3 by sandwiching it with a fixing nut 32. This fixes the plate 33 and the channel steel 34 welded to the plate 33 to the top surface of the foundation 3. Next, the exterior wall material 2a, with the threaded rod 6 screwed into the embedded first nut 5, is erected on the top surface of the foundation 3. Then, the exterior wall fixing bracket 4a and washer 63 are fitted onto the threaded rod 6, the second nut 7 is screwed onto the threaded rod 6 and tightened, the locking part 42 of the exterior wall fixing bracket 4a is locked to the upper flange of the channel steel 34, and the lower end of the exterior wall material 2a is fixed to the top surface of the foundation 3.

[0037] <Maintenance methods for fixed structures> The maintenance method for the fixing structure in this embodiment involves, first, as shown in Figures 2 and 6, rotating the second nut 7 in the loosening direction with a tool such as a wrench to remove it from the threaded rod 6, and removing the washer 63 from the threaded rod 6. Next, the exterior wall fixing bracket 4a, which is the object to be fixed 4, is removed from the threaded rod 6, the locking portion 42 of the exterior wall fixing bracket 4a and the channel steel 34 are released, and the fixing between the lower end of the exterior wall material 2a and the top of the foundation 3 is released.

[0038] If the threaded rod 6 is deteriorated or damaged, it is also removed from the first nut 5 for maintenance such as replacement. Specifically, the operating part 62 of the threaded rod 6 is operated with a tool to rotate the threaded rod 6 in the loosening direction and remove it from the first nut 5. After removing the second nut 7, washer 63, exterior wall fixing bracket 4a as the object to be fixed 4, and threaded rod 6, these are replaced or repaired as necessary.

[0039] After the replacement and repair are complete, the fixing structure 1 is reassembled. Specifically, first, the operating part 62 of the threaded rod 6 is operated with a tool to screw the threaded rod 6 onto the first nut 5. Next, the exterior wall fixing bracket 4a is fitted onto the threaded rod 6 so that the threaded rod 6 is inserted into the insertion hole 40 of the exterior wall fixing bracket 4a, which is the object to be fixed 4. Then, the second nut 7 is screwed onto the threaded rod 6 and tightened, the exterior wall fixing bracket 4a is pressed against the first nut 5 to fix it in place, the locking part 42 of the exterior wall fixing bracket 4a is locked onto the upper flange of the channel steel 34, the lower end of the exterior wall material 2a is fixed to the top of the foundation 3, and the maintenance of the fixing structure 1 is completed.

[0040] In this way, since the exterior wall fixing bracket 4a, which is the object to be fixed 4, is pressed against the first nut 5 by the second nut 7 that is screwed onto the threaded rod 6, the exterior wall fixing bracket 4a can be removed and replaced or maintained simply by removing the second nut 7 from the threaded rod 6. In the above maintenance process, there is no need to touch the first nut 5, which cannot be removed from the exterior wall material 2a as the base member 2, thus preventing damage to the first nut 5. On the other hand, if the threaded rod 6 is damaged, the threaded rod 6 can be removed from the first nut 5, so there is no need to replace the entire exterior wall material 2a as the base member 2, thus improving maintainability.

[0041] <Method for manufacturing base components> When manufacturing the base member 2, which is a concrete component such as the exterior wall material 2a, the first nut 5 is placed at an appropriate position on the formwork 20 that forms the base member 2, as shown in Figure 4(A). At this time, the first nut 5 is positioned so that its opening is exposed from the concrete being poured. Furthermore, the position in which the first nut 5 is placed is such that it does not come into contact with the bottom surface of the formwork 20, so that the first nut 5 is supported, for example, by the reinforcement of the concrete component. Alternatively, a threaded rod 6 may be screwed into the first nut 5 before placing it, and the first nut 5 may be positioned in a way that it is elevated by supporting the threaded rod 6 from above.

[0042] After placing the first nut 5 in the formwork 20, if the threaded bolt 6 is not already screwed into the first nut 5, the threaded bolt 6 is then screwed into the first nut 5. After the first nut 5 is placed and the threaded bolt 6 is screwed into the first nut 5, concrete is poured into the formwork 20 as shown in Figure 4(B). When concrete is poured into the formwork 20, the first nut 5 is embedded so that only the opening is exposed from the poured concrete. After that, as shown in Figure 5(C), the concrete poured into the formwork 20 is cured, and as shown in Figure 5(D), the formwork is removed to form the base member 2.

[0043] <Variation> In this embodiment, the fixing structure 1 involves fixing an exterior wall fixing bracket 4a, which is the object to be fixed, to the exterior wall material 2a, which is the base member 2, in order to fix the exterior wall material 2a, which is the base member 2, to the top surface 3 of the foundation. However, the object to be fixed 4 is not limited to the exterior wall fixing bracket 4a. For example, as shown in Figure 7, the object to be fixed 4 can be any member attached to the exterior wall, such as signs such as billboards, pictograms, room number plates 33, nameplates, outdoor lighting, or mounting brackets for surveillance cameras. When attaching such an object to be fixed 4 to the exterior wall, a threaded rod 6 protruding from a first nut 5 embedded in the exterior wall material 2a, which is the base member 2, is inserted into the insertion hole 40 of the object to be fixed 4, and the second nut 7 presses the object to be fixed 4 towards the first nut 5, thereby fixing the object to be fixed 4 to the exterior wall material 2a, which is the base member 2.

[0044] When replacing or maintaining the fixed object 4, the second nut 7 can be removed from the threaded rod 6, and the washer 63 and fixed object 4 can be removed, allowing maintenance to be performed without removing the threaded rod 6 from the first nut 5. Therefore, damage to the first nut 5 can be suppressed. On the other hand, if the threaded rod 6 is damaged, the threaded rod 6 can be removed and replaced by operating the operating part 62.

[0045] [Second Embodiment] Next, a second embodiment of the fixed structure 1 and the maintenance method for the fixed structure of the present invention will be described with reference to Figures 8 to 10. Note that components similar to those in the fixed structure 1 and the maintenance method for the fixed structure of the first embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0046] <Securing structure of the second embodiment> The fixing structure 1 of the second embodiment fixes the object to be fixed 4 to a steel column 2b which serves as a base member 2. Note that the base member 2 is not limited to a steel column 2b, but may be various steel members such as a steel frame such as a steel beam or a steel interior base such as a stud. As shown in Figures 8 and 9, the fixing structure 1 of this embodiment comprises a base member 2, a first nut 5 irreversibly fixed to the base member 2, a threaded rod 6 screwed into the first nut 5 and protruding to one side from the first nut 5, an object to be fixed 4 having an insertion hole 40 into which the threaded rod 6 is inserted, and a second nut 7 screwed into the threaded rod 6 to fix the object to be fixed 4.

[0047] In this embodiment, the base member 2 is a rectangular tubular steel column 2b, and the first nut 5 is a cap nut welded to the back surface of the base member 2. The steel column 2b is tapped at the position where the first nut 5 is welded, allowing a threaded rod 6 to be fastened. The first nut 5 is, for example, a cap nut, but the first nut 5 may also be a through nut, provided that the tip of the threaded rod 6 has a length that allows it to pass through the inside of the base member 2 and abut against the inner surface on the opposite side. In this case, the surface of the base member 2 opposite to the surface to which the first nut 5 is welded becomes the restricting portion 50.

[0048] The threaded rod 6 and the second nut 7 have the same configuration as in the first embodiment, so their description will be omitted.

[0049] In this embodiment, the object to be fixed 4 is a light fixture 4b fixed to the steel column 2b, which serves as the base member 2. The object to be fixed 4 is not limited to the light fixture 4b, but may be various other objects fixed to the steel column 2b.

[0050] <Construction method for fixed structures> When constructing the fixing structure 1 as described above, first, as shown in Figure 9, the first nut 5 is welded to the base member 2. The base member 2 is pre-tapped to allow insertion of the threaded rod 6. Then, the threaded rod 6 is screwed into the welded first nut 5, the object to be fixed 4 and the washer 63 are fitted onto the threaded rod 6, the second nut 7 is screwed onto the threaded rod 6 and tightened, and the object to be fixed 4 is pressed against the base member 2 to secure it.

[0051] <Maintenance methods for fixed structures> The maintenance method for the fixing structure in this embodiment involves first removing the second nut 7 from the threaded rod 6 by rotating it in the loosening direction with a tool such as a wrench, and removing the washer 63 from the threaded rod 6. Next, the object to be fixed 4 is removed from the threaded rod 6. If the threaded rod 6 itself is deteriorated or damaged, the operating part 62 of the threaded rod 6 is operated with a tool to rotate the threaded rod 6 in the loosening direction and remove it from the first nut 5. After removing the second nut 7, washer 63, the lighting fixture 4b as the object to be fixed 4, and the threaded rod 6, they are replaced or repaired as necessary.

[0052] After the replacement and repair are complete, the fixing structure 1 is reassembled. Specifically, first, the operating part 62 of the threaded rod 6 is operated with a tool to screw the threaded rod 6 onto the first nut 5. Next, the object to be fixed 4 is fitted onto the threaded rod 6 so that the threaded rod 6 is inserted into the insertion hole 40 of the object to be fixed 4. Then, the second nut 7 is screwed onto the threaded rod 6 and tightened to fix the object to be fixed 4 to the base member 2, completing the maintenance of the fixing structure 1.

[0053] <Variation> In this embodiment, the fixing structure 1 fixes a lighting fixture 4b, which is the object to be fixed, to a steel column 2b, which is the base member 2. However, the object to be fixed 4 is not limited to this. For example, the base member 2 may be a steel interior base 2c, such as a stud. A first nut 5 is welded to the steel interior base 2c, and a threaded rod 6 is screwed into the first nut 5 so as to penetrate an interior surface material such as gypsum board that is attached to the steel interior base 2c. The object to be fixed 4 may also be a shelf bracket or hook that is fixed to the threaded rod 6, which is positioned to protrude from the interior surface material 8. An insertion hole 40 provided in the object to be fixed 4, such as a shelf bracket or hook, is fitted into the threaded rod 6, and the threaded rod 6 is tightened with a washer 63 and a second nut 7 to fix the object to be fixed 4 to the surface of the interior surface material 8.

[0054] When replacing or maintaining the fixed object 4, the second nut 7 can be removed from the threaded rod 6, and the washer 63 and fixed object 4 can be removed, allowing maintenance to be performed without removing the threaded rod 6 from the first nut 5. Therefore, damage to the first nut 5 can be suppressed. On the other hand, if the threaded rod 6 is damaged, the threaded rod 6 can be removed and replaced by operating the operating part 62. Even in such cases, it is not necessary to remove the first nut 5 which is welded to the steel interior substrate 2c, which is the base member 2, so maintenance can be easily performed.

[0055] It goes without saying that the embodiments of the present invention are not limited to those described above, and can be modified as appropriate without departing from the scope of the spirit of the present invention.

[0056] This specification discloses the following technologies:

[0057] [Note 1] A fixing structure for fixing an object to be fixed to a base member, comprising: a first nut irreversibly fixed to the base member in advance; a threaded rod screwed onto the first nut with one end protruding from the first nut; the object to be fixed having an insertion hole into which the threaded rod is inserted from its protruding end; and a second nut screwed onto the threaded rod, wherein the second nut presses the object to be fixed against the first nut side to secure it.

[0058] According to the fixing structure described in Appendix 1, a threaded rod is screwed onto a first nut that is irreversibly fixed to the base member, and an object to be fixed, which has an insertion hole into which the threaded rod is inserted, is pressed against the first nut by a second nut that is screwed onto the threaded rod. Therefore, when maintaining the object to be fixed, the object can be removed for replacement or maintenance by removing the second nut from the threaded rod, preventing damage to the first nut, which is irreversibly fixed to the base member. On the other hand, if the threaded rod is damaged during replacement or maintenance of the object to be fixed, it can be removed from the first nut and replaced, eliminating the need to replace the entire base member and improving maintainability.

[0059] [Note 2] In the fixing structure described in Appendix 1, the threaded rod has an operating part formed at its protruding end that does not interfere with the screwing of the second nut, and that allows the threaded rod to be rotated in the tightening and loosening direction.

[0060] According to the fixing structure described in Appendix 2, the threaded rod has an operating part formed on its protruding end that does not interfere with the screwing of the second nut and allows the threaded rod to be rotated in the tightening and loosening direction. Therefore, the threaded rod can be easily rotated, and the work of removing the threaded rod from the first nut can be made easier.

[0061] [Note 3] The fixing structure of Appendix 2 further includes a restricting part that contacts the end of the threaded rod opposite to the protruding end, thereby restricting the movement of the threaded rod toward the opposite side.

[0062] According to the fixing structure described in Appendix 3, the restricting part abuts against the end of the threaded rod opposite to the protruding end, restricting the movement of the threaded rod to the other side. This allows the threaded rod to be held in an appropriate position without being inserted too far into the first nut. Furthermore, it prevents the threaded rod from rotating when removing the second nut from it.

[0063] [Note 4] In the fixing structure described in Appendix 3, the base member is made of concrete, and the first nut is fixed by being embedded in the base member.

[0064] According to the fixing structure in Appendix 4, the base member is made of concrete, and the first nut is fixed by being embedded in the base member. Therefore, the object to be fixed is secured by the threaded bolt to which the first nut is screwed and the second nut that is screwed onto the threaded bolt. When replacing or maintaining the object to be fixed, only the threaded bolt and the second nut need to be unscrewed, so there is no risk of damaging the first nut. As the first nut embedded in concrete is less likely to be damaged, the occurrence of problems that would necessitate replacing the base member itself can be suppressed.

[0065] [Note 5] In the fixing structure described in Appendix 3, the base member is made of steel, and the first nut is fixed by welding to the base member.

[0066] According to the fixing structure described in Appendix 5, the base member is made of steel, and the first nut is welded to the steel member. Therefore, the object to be fixed is secured by the threaded rod to which the first nut is screwed and the second nut screwed to the threaded rod. When replacing or maintaining the object to be fixed, only the threaded rod and the second nut need to be unscrewed, eliminating the risk of damaging the first nut. This makes the welded first nut less susceptible to damage, thus suppressing the occurrence of problems that would necessitate replacing the steel member itself.

[0067] [Note 6] A method for manufacturing a base member used in the fixing structure of Appendix 4, comprising the steps of: placing the first nut at a predetermined position in a formwork that forms the base member; screwing the threaded rod into the first nut; pouring concrete into the formwork after the first nut has been placed and the threaded rod has been screwed into the first nut, thereby embedding the first nut in the concrete; and curing the concrete and demolding to obtain the base member.

[0068] According to the manufacturing method of the base member described in Appendix 6, since the threaded bolt is screwed into the first nut placed in a predetermined position on the formwork, and then concrete is poured into the formwork, it is possible to prevent concrete from flowing into the threaded hole of the first nut, and the concrete pouring process can be carried out easily and appropriately.

[0069] [Note 7] A maintenance method for maintaining any of the fixing structures described in Appendix 2 to Appendix 5, comprising the steps of: rotating the second nut in the loosening direction to remove it from the threaded rod; removing the object to be fixed from the threaded rod; operating the operating part of the threaded rod to loosen the threaded rod and remove it from the first nut; replacing or repairing the second nut, the object to be fixed, and the threaded rod as necessary; screwing the threaded rod onto the first nut; inserting the threaded rod into the insertion hole of the object to be fixed; and screwing the second nut onto the threaded rod and pressing the object to be fixed against the first nut to secure it.

[0070] According to the maintenance method described in Appendix 7, when a threaded rod is damaged and needs to be replaced, the second nut and the object to be fixed can be removed from the threaded rod, and then the threaded rod can be removed from the first nut by operating the operating part of the threaded rod. This improves maintainability compared to fixing means that cannot be replaced, such as anchor bolts. Furthermore, since the second nut and the object to be fixed are fixed by the threaded rod, the first nut, which is difficult to remove from the base member, is less likely to be damaged, thus minimizing the need for major maintenance such as replacing the base member itself. [Industrial applicability]

[0071] The fixing structure according to the present invention is suitable, for example, as a structure for fixing ancillary items such as exterior wall fixing brackets, signs, and lighting to exterior wall materials; the manufacturing method of the base member is suitable, for example, as a manufacturing method of exterior wall materials used in the above-mentioned fixing structure; and the maintenance method of the fixing structure is suitable as a method for repairing and replacing the second nut, the object to be fixed, and the threaded bolt. [Explanation of Symbols]

[0072] 1…Fixing structure, 2…Base member, 4…Object to be fixed, 5…First nut, 6…Threaded rod, 7…Second nut, 20…Formwork, 40…Insertion hole, 61…Protruding end, 62…Operating part

Claims

1. A fixing structure for fixing an object to be fixed to a base member, A first nut which is irreversibly fixed to the base member in advance, A threaded rod is screwed onto the first nut, with one end protruding from the first nut, The object to be fixed has an insertion hole into which the aforementioned threaded bolt is inserted from its protruding end, A second nut is screwed onto the aforementioned threaded rod, Equipped with, The second nut presses the object to be fixed against the first nut to secure it. Fixed structure.

2. The threaded rod has a protruding end that does not interfere with the screwing of the second nut, and has an operating part that allows the threaded rod to be rotated in the tightening and loosening direction. The fixing structure according to claim 1.

3. The system further includes a restricting portion that contacts the end of the threaded rod opposite to the protruding end, thereby restricting the movement of the threaded rod toward the opposite side. A fixing structure for the regulation according to claim 2.

4. The base member is made of concrete. The first nut is fixed by being embedded in the base member. The fixing structure according to claim 3.

5. The base member is a steel member, The first nut is fixed by welding to the base member. The fixing structure according to claim 3.

6. A method for manufacturing a base member used in the fixed structure described in claim 4, A step of placing the first nut at a predetermined position in the formwork that forms the base member, The process of screwing the threaded rod into the first nut, The first nut is positioned and the threaded rod is screwed into the first nut, and then concrete is poured into the formwork to embed the first nut in the concrete. The process of curing the concrete and demolding to obtain the base member, A method for manufacturing a base member equipped with the above.

7. A method for maintaining a fixed structure according to any one of claims 2 to 5, The process of removing the second nut from the threaded rod by rotating it in the loosening direction, The process of removing the object to be fixed from the threaded rod, The steps include: operating the operating part of the threaded rod to loosen the threaded rod and remove it from the first nut; The process involves replacing or repairing the second nut, the object to be fixed, and the threaded bolt as necessary. The process of screwing the threaded rod onto the first nut, The steps include inserting the threaded bolt into the insertion hole of the object to be fixed, The process involves screwing the second nut onto the threaded rod and pressing the object to be fixed against the first nut to secure it, A maintenance method for a fixed structure equipped with the following features.

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