JP7607020B2 - Fixed Structure - Google Patents

Description

The present invention relates to a fixing structure .

When fixing an object to a concrete floor, post-installed anchors are generally used. That is, holes are drilled into the concrete floor and an anchor bolt is embedded in the hole, so that the support member that supports the object is fixed to the floor.

JP 2006-118317 A

However, when using post-installed anchors, there are issues such as the risk of destruction of the concrete floor surface, the risk of damage to objects (rebar and other buried objects) buried in the concrete floor surface, restrictions on the hole positions for the post-installed anchors due to the buried objects, and noise and vibration during installation.

The present invention has been made in consideration of the above circumstances, and provides a fixing structure that ensures fixing strength and can be relatively easily modified.

[1] A fixing structure according to one embodiment of the present invention includes a plate disposed between the concrete floor and the object to be installed, a layer of a first adhesive in contact with the concrete floor and a first surface of the plate, and a layer of a second adhesive in contact with the second surface of the plate and the underside of a support member supporting the object to be installed, wherein the object to be installed is fixed to the concrete floor by an adhesive force between the first adhesive and the second adhesive, the adhesive force being lower than the upper limit of the heat resistance temperature of the first adhesive, and when the temperature of the second adhesive is raised from a temperature lower than the upper limit of the heat resistance temperature of the second adhesive to a specific temperature lower than the upper limit of the heat resistance temperature of the first adhesive and higher than the upper limit of the heat resistance temperature of the second adhesive, the adhesive force of the second adhesive is weakened, and even when the temperature of the first adhesive is raised to the specific temperature, the adhesive force of the first adhesive is not significantly weakened.
[2] In the above fixing structure, the plate has a metal plate provided between the first adhesive and the second adhesive forming the multiple layers.
[3] In the above-mentioned fixing structure, a support member is provided that supports the object to be installed so as to fix it to the concrete floor surface, and the plate has the first surface that faces the concrete floor surface via the first adhesive layer, and the second surface that faces the support member via the second adhesive layer.
[4] In the above fixing structure, the first adhesive is a thermosetting adhesive, and the second adhesive is a room temperature curing adhesive.
[5] In the above-mentioned fixing structure, the first adhesive is an adhesive that has the ability to be impregnated into concrete, and the second adhesive is an adhesive that has no ability to be impregnated into concrete or has a smaller ability to be impregnated into concrete than the first adhesive.
[6] In the above-mentioned fixing structure, the surface of the plate-shaped base of the support member has a hole penetrating the base, and a portion of the second adhesive before hardening is configured to be able to be discharged from the layer of the second adhesive through the hole to the top of the base.
(1) A fixing structure according to one embodiment of the present invention is a fixing structure for fixing an object to a concrete floor surface, characterized in that it comprises a support member for supporting the object to be installed, a plate arranged between the support member and the floor surface, a first adhesive provided between the plate and the floor surface and fixing the plate to the floor surface, and a second adhesive provided between the support member and the plate and fixing the support member to the plate.

(2) In the above fixing structure, the first adhesive and the second adhesive are different in type.

(3) In the above fixing structure, the first adhesive is a thermosetting adhesive, and the second adhesive is a room temperature curing adhesive.

(4) In the above fixing structure, the first adhesive is an adhesive that has the ability to be impregnated into concrete, and the second adhesive is an adhesive that has no ability to be impregnated into concrete or has a smaller ability to be impregnated into concrete than the first adhesive.

(5) In the above fixing structure, the particles contained in the first adhesive are smaller than the particles contained in the second adhesive.

(6) In the above fixing structure, the second adhesive is more soluble in a specified solvent than the first adhesive.

(7) In the above fixing structure, when heated, the adhesive strength of the second adhesive weakens at a lower temperature than that of the first adhesive.

(8) In the above fixing structure, the adhesion area of the first adhesive is greater than the adhesion area of the second adhesive.

(9) In the above fixing structure, the support member has a plate-shaped base, the second adhesive is provided between the plate and the base and fixes the base to the plate, the plate is larger than the base, and the adhesive area of the first adhesive is larger than the adhesive area of the second adhesive.

(10) In the above fixing structure, the thickness of the plate is thinner than the thickness of the base.

(11) One aspect of the fixing method of the present invention is a method for fixing an object to a concrete floor, in which a plate is fixed to the floor using a first adhesive, and a support member that supports the object is fixed to the plate using a second adhesive.

(12) A method for modifying a fixed structure according to one aspect of the present invention is a method for modifying a fixed structure having a support member for supporting an object to be installed, a plate disposed between the support member and a concrete floor surface, a first adhesive disposed between the plate and the floor surface to fix the plate to the floor surface, and a second adhesive disposed between the support member and the plate to fix the support member to the plate, in which, with the plate fixed to the floor surface by the first adhesive, the adhesive force of the second adhesive is weakened and the support member is removed from the plate.

(13) In the above-mentioned method for modifying a fixed structure, while the plate is left on the floor surface, a new support member for supporting a new installation is fixed onto the plate with the newly applied second adhesive or another adhesive.

(14) In the above-mentioned method for modifying a fixing structure, while the plate is left on the floor surface, a new plate is fixed to the floor surface using the first adhesive or another adhesive that has been newly applied, and while the plate is left on the floor surface, a new support member that supports a new installation is fixed onto the new plate using the second adhesive or another adhesive that has been newly applied.

According to the present invention , it is possible to provide a fixing structure which ensures the fixing strength of an installed object and can be modified relatively easily.

FIG. 2 is a cross-sectional view showing the installation, the fixing structure, and the concrete floor of the first embodiment. 2 is an enlarged cross-sectional view showing the area surrounded by line F2 in FIG. 1. 3 is a cross-sectional view taken along line F3-F3 of the fixing structure shown in FIG. 2. FIG. 1 is a diagram showing the characteristics of an epoxy resin adhesive and a urethane resin adhesive. 5 is a flowchart showing an example of the flow of a fixing method according to the first embodiment. 11A and 11B are cross-sectional views showing a fixing structure before and after modification of an example of the first embodiment. 5 is a flowchart showing an example of the flow of a method for modifying a fixing structure according to the first embodiment. 11A and 11B are cross-sectional views showing the fixing structure before and after modification of another example of the first embodiment. 10 is a flowchart showing another example of the flow of the method for modifying the fixing structure according to the first embodiment. FIG. 11 is a cross-sectional view showing the fixing structure and concrete floor of the second embodiment. FIG. 13 is a perspective view showing the installation, the fixing structure, and the concrete floor of the third embodiment. 13A and 13B are plan views showing the installation, fixing structure, and concrete floor before and after modification of an example of the third embodiment.

The following describes the fixing structure, fixing method, and method of modifying the fixing structure of the embodiment. Note that in the following description, components having the same or similar functions are given the same reference numerals. Furthermore, duplicate descriptions of those components may be omitted.

(First embodiment)
The fixing structure FS of the first embodiment is a fixing structure that can be widely used in, for example, communication facilities, data centers, and various other facilities, and that fixes an installation object 2 to a concrete floor surface 1 (for example, a floor slab, hereinafter referred to as a "concrete floor 1"). That is, in this specification, "fixing an installation object to a concrete floor" is not limited to directly fixing the installation object itself to the concrete floor, but also includes a case where a support member that supports the installation object is fixed to the concrete floor so that the installation object does not move relative to the concrete floor.

In this embodiment, the installed object 2 fixed by the fixing structure FS is various equipment installed in a building (for example, a communication switchboard, an air conditioner, various power system devices (batteries)), and components for forming a double floor in a building. However, the installed object 2 fixed by the fixing structure FS is not limited to specific equipment, devices, or components, and can be a wide variety of equipment, devices, and components.

(Fixed structure)
First, the fixing structure FS of the first embodiment will be described. Fig. 1 is a cross-sectional view showing an installation object 2, a fixing structure FS, and a concrete floor 1 of the first embodiment. For the sake of convenience, the plates and adhesive included in the fixing structure FS are omitted in Fig. 1.

The fixing structure FS includes a metallic support member 10 that supports the installation object 2. In this embodiment, the support member 10 is disposed below the installation object 2 and supports the installation object 2 from below. The support member 10 is, for example, a stand. The support member 10 includes, for example, a support member main body (stand main body) 11, a support shaft 12, and a base 13. The support member main body 11, the support shaft 12, and the base 13 are made of metal (for example, steel).

The support member body 11 constitutes the main part of the support member 10, and is disposed below the installation object 2 to support the installation object 2 from below. In other words, the installation object 2 is placed on the support member body 11 and fixed to the support member body 11 by a fixing member (not shown). In this way, the installation object 2 is installed on the building.

The support shaft 12 protrudes downward from the lower end of the support member body 11. The support shaft 12 is formed in an axial shape along the vertical direction and is disposed approximately perpendicular to the concrete floor 1. In a plan view, the support shafts 12 are disposed in correspondence with the four corners of the support member body 11. However, the position of the support shafts 12 is not limited to the above example.

The base 13 is disposed at the bottom of the support member 10. The base 13 is formed in a plate shape that is approximately parallel to the upper surface of the concrete floor 1. The base 13 is polygonal (e.g., rectangular), but may be circular or have other shapes. The base 13 is connected to the lower end of the support shaft 12 and supports the support shaft 12 from below.

Figure 2 is an enlarged cross-sectional view of the area surrounded by line F2 in Figure 1. Figure 3 is a cross-sectional view taken along line F3-F3 of the fixing structure FS shown in Figure 2. In Figure 3, the first adhesive 21 and the second adhesive 22 are hatched with a dot pattern for ease of understanding. As shown in Figures 2 and 3, the fixing structure FS has a plate 20, a first adhesive 21, and a second adhesive 22 in addition to the support member 10 described above.

The plate 20 is formed in a plate shape that fits along the upper surface of the concrete floor 1. The plate 20 is disposed between the support member 10 and the concrete floor 1. In this embodiment, the plate 20 is disposed between the base 13 of the support member 10 and the concrete floor 1. The plate 20 is made of, for example, a metal (e.g., steel). The plate 20 is made of, for example, approximately the same material as the base 13 of the support member 10.

The thickness T1 of the plate 20 is thinner than the thickness T2 of the base 13 (see FIG. 2). The plate 20 has a thickness that allows it to elastically deform in response to, for example, distortion of the upper surface of the concrete floor 1. The thickness T1 of the plate 20 is, for example, 1.0 mm to 2.0 mm, but is not limited to this. For example, the plate 20 has a thickness that is unlikely to interfere with the installation of a new fixed structure or other work, even if it is left on the concrete floor 1 for a long period of time (for example, semi-permanently until the building is demolished). However, the plate 20 is not limited to being thin as described above, and may have a certain degree of thickness.

The plate 20 has a larger outer shape than the base 13 in a plan view (see FIG. 3). For ease of explanation, a first direction X and a second direction Y are defined here. The first direction X and the second direction Y are each substantially parallel to the upper surface of the concrete floor 1. The second direction Y is substantially perpendicular to the first direction X. When the first direction X and the second direction Y are defined in this way, the width W1X of the plate 20 in the first direction X is larger than the width W2X of the base 13 in the first direction X. The width W1Y of the plate 20 in the second direction Y is larger than the width W2Y of the base 13 in the second direction Y.

In other words, the plate 20 has a first region 31 and a second region 32. The first region 31 is a region that overlaps with the base 13 of the support member 10 in the thickness direction of the plate 20 (the vertical direction in this embodiment). On the other hand, the second region 32 is a region that is located on the outer periphery side of the first region 31 and does not overlap with the base 13 of the support member 10 in the thickness direction of the plate 20.

The first adhesive (first adhesive layer) 21 is provided between the plate 20 and the concrete floor 1, and fixes the plate 20 to the concrete floor 1. The first adhesive 21 has the property of being able to firmly fix, for example, the metal plate 20 to the concrete floor 1. The first adhesive 21 is provided, for example, on the entire surface (whole area) of the plate 20. That is, the first adhesive 21 is provided on both the first region 31 and the second region 32 of the plate 20. As a result, the first adhesive 21 more firmly fixes the plate 20 to the concrete floor 1.

The second adhesive (second adhesive layer) 22 is provided between the support member 10 and the plate 20, and fixes the support member 10 to the plate 20. The second adhesive 22 has a property capable of firmly fixing, for example, the metallic support member 10 and the metallic plate 20. In this embodiment, the second adhesive 22 is provided between the base 13 of the support member 10 and the plate 20, and fixes the base 13 to the plate 20. The second adhesive 22 is provided, for example, on the entire surface (whole area) of the base 13. In other words, the second adhesive 22 is provided in the first region 31 of the plate 20 and in its vicinity. The second adhesive 22 is not provided in all or most of the second region 32 of the plate 20.

Therefore, the adhesion area of the first adhesive 21 (the adhesion area between the plate 20 and the concrete floor 1 by the first adhesive 21) is larger than the adhesion area of the second adhesive 22 (the adhesion area between the base 13 and the plate 20 by the second adhesive 22).

In this embodiment, the first adhesive 21 and the second adhesive 22 are different types of adhesive. Below, an example of the properties (characteristics) of each of the first adhesive 21 and the second adhesive 22 is described. However, the first adhesive 21 and the second adhesive 22 do not need to have all the properties described below, but may have one or more of the properties.

For example, the first adhesive 21 is a thermosetting adhesive. On the other hand, the second adhesive 22 is a room temperature curing adhesive. In general, a thermosetting adhesive has a higher adhesive strength than a room temperature curing adhesive, and the first adhesive 21 has a higher adhesive strength than the second adhesive 22. For example, the first adhesive 21 has a higher shear adhesive strength than the second adhesive 22. "Shear adhesive strength" refers to the adhesive strength in the direction along the top surface of the concrete floor 1.

For example, the first adhesive 21 is an adhesive that has the ability to impregnate concrete. On the other hand, the second adhesive 22 is an adhesive that has no ability to impregnate concrete or has a lower ability to impregnate concrete than the first adhesive 21. For example, the particles contained in the first adhesive 21 are smaller than the particles contained in the second adhesive 22. In general, the smaller the particles that make up the adhesive, the better the impregnation into the object to be adhered (e.g. concrete). The greater the impregnation into the object to be adhered, the higher the adhesive strength to the object to be adhered.

For example, the second adhesive 22 is more soluble in a specific solvent than the first adhesive 21. The specific solvent is, for example, a release agent (solvent) that impregnates the second adhesive 22 and weakens the adhesive strength of the second adhesive.

For example, the second adhesive 22 has lower heat resistance than the first adhesive 21. When heated, the adhesive strength of the second adhesive 22 weakens at a lower temperature than the first adhesive. In other words, the adhesive strength of the second adhesive 22 weakens when it is continuously heated to a specific temperature for a predetermined period of time. On the other hand, the adhesive strength of the first adhesive 21 is less likely to weaken than that of the second adhesive 22, even when it is continuously heated to the above-mentioned specific temperature for the predetermined period of time.

In this embodiment, the first adhesive 21 is, for example, an epoxy resin adhesive. On the other hand, the second adhesive 22 is, for example, a urethane resin adhesive.

An "epoxy resin adhesive" is an adhesive that uses epoxy resin as the base agent and modified polyamine or modified polyamide as the hardener. According to another definition, an "epoxy resin adhesive" refers to an adhesive that hardens a compound containing an epoxy group with amines or acid anhydrides.

A "urethane resin adhesive" is an adhesive whose main component is an isocyanate polyol. According to another definition, a "urethane resin adhesive" refers to an adhesive that utilizes the reactivity of the isocyanate group (-NCO) contained in the molecule. One example of a "urethane resin adhesive" is a moisture-curing one-component adhesive whose main component is a prepolymer terminated with an NCO group.

Figure 4 is a diagram showing typical characteristics of epoxy resin adhesives and urethane resin adhesives. As shown in Figure 4, epoxy resin adhesives have heat curing properties, good heat resistance when continuously heated to less than 100°C, excellent chemical resistance to water, oil, and alkali, good chemical resistance to acid, and impregnation into concrete. On the other hand, urethane resin adhesives have room temperature curing properties, tolerate continuous heating to less than 80°C (for example, in the case of a silylated urethane resin system), good chemical resistance to water, acid, alkali, and oil (for example, in the case of a silylated urethane resin system), and are substantially not impregnated into concrete. In this specification, "excellent" and "superior" mean better than "good" and "good". However, the first adhesive 21 and the second adhesive 22 are not limited to epoxy resin adhesives and urethane resin adhesives.

(Fixing method using fixed structure)
Next, a method for fixing the installation object 2 using the fixing structure FS of this embodiment will be described. FIG. 5 is a flow chart showing an example of the flow of the fixing method of this embodiment. First, the first adhesive 21 is applied to an area on the surface of the concrete floor 1 where the plate 20 is to be installed (S101). Next, the plate 20 is placed on the applied first adhesive 21 (S102). Note that the first adhesive 21 may be applied to the surface of the plate 20 in addition to or instead of the concrete floor 1. Then, for example, the first adhesive 21 is heated to harden the first adhesive 21 (S103). As a result, the plate 20 is adhered to the concrete floor 1.

At this time, a force may be applied to the plate 20 toward the concrete floor 1 in order to deform the plate 20 in response to distortions on the top surface of the concrete floor 1, etc. The method of applying force to the plate 20 may be by hand or machine, or by placing a weight on the plate 20, and the method is not particularly limited. In this way, the plate 20 is fixed to the concrete floor 1 in a state in which the plate 20 has been deformed in response to distortions on the top surface of the concrete floor 1, etc.

Next, the second adhesive 22 is applied to the area of the surface of the plate 20 where the base 13 of the support member 10 is to be installed (S104). Next, the base 13 of the support member 10 is placed on the applied second adhesive 22 (S105). Note that the second adhesive 22 may be applied to the surface of the base 13 of the support member 10 in addition to or instead of the plate 20. Then, the second adhesive 22 is hardened (S106). This causes the base 13 of the support member 10 to adhere to the plate 20. This realizes a fixing structure FS for fixing the installation object 2 to the concrete floor 1. After that, the installation object 2 is fixed to the support member 10. This causes the installation object 2 to be fixed to the concrete floor 1.

(Method 1 of modifying the fixing structure)
Next, an example of a method for modifying the fixing structure FS of this embodiment will be described. That is, the installation object 2 may be replaced with a new installation object 2A (see FIG. 12) due to technological progress, changes in use (requirements), or other reasons. The new installation object 2A may differ from the existing installation object 2 in, for example, weight, size, required earthquake resistance, etc. For this reason, when installing the new installation object 2A, a new support member 10A corresponding to the new installation object 2A may be provided. FIG. 6 is a cross-sectional view showing the fixing structure FS before and after modification. (a) in FIG. 6 shows the fixing structure FS before modification. (b) in FIG. 6 shows the fixing structure FS after modification.

Here, we will explain a modification method in which a new support member 10A that supports a new installation 2A is fixed onto a plate 20 that is left on the concrete floor 1. Note that we will take as an example a case in which the configuration of the new support member 10A is approximately the same as that of the existing support member 10. That is, the new support member 10A has, for example, a plate-shaped base 13. However, the new support member 10A may have a different configuration from that of the existing support member 10.

Figure 7 is a flow chart showing an example of the flow of a method for modifying the fixing structure FS of this embodiment. In this modification method, first, the adhesive strength of the second adhesive 22 is weakened (S201). The adhesive strength of the second adhesive 22 may be weakened, for example, by applying a release agent (solvent) to the second adhesive 22 and impregnating the second adhesive 22 with the release agent, or by heating the second adhesive 22. However, the method for weakening the adhesive strength of the second adhesive 22 is not limited to the above example, and other methods may be used.

Here, the release agent applied to the second adhesive 22 may be a specified release agent as follows. In other words, the "specified release agent" preferably has a greater effect of weakening the adhesive strength of the second adhesive 22 (suitability for the composition of the second adhesive 22) than it has an effect of weakening the adhesive strength of the first adhesive 21 (suitability for the composition of the first adhesive 21). With such a release agent, even if the release agent happens to come into contact with the first adhesive 21, it is possible to avoid a significant weakening of the adhesive strength of the first adhesive 21.

The second adhesive 22 may be heated, for example, by applying heat to the base 13 of the support member 10. With this method, it is possible to suppress the temperature rise of the first adhesive 21 and suppress the weakening of the adhesive strength of the first adhesive 21, compared to, for example, the case where the second adhesive 22 is heated by applying heat to the plate 20.

Heating the second adhesive 22 may be performed by heating the second adhesive 22 to a specific temperature. The "specific temperature" is, for example, a temperature lower than the upper limit of the heat resistance temperature of the first adhesive 21 (i.e., a temperature at which the adhesive strength of the first adhesive 21 is maintained at a predetermined level or higher), and is a temperature at which the adhesive strength of the second adhesive 22 weakens. For example, if an epoxy resin adhesive has good heat resistance to being continuously heated to temperatures below 100°C, while a urethane resin adhesive is allowed to be continuously heated to temperatures below 80°C, the specific temperature is, for example, a temperature between 80°C and 100°C. According to this method, even when the second adhesive 22 is heated, it is possible to avoid a significant weakening of the adhesive strength of the first adhesive 21.

Next, the base 13 of the support member 10 is removed from the plate 20 (S202). That is, while the plate 20 is fixed to the concrete floor 1 by the first adhesive 21 and left on the concrete floor 1, the adhesive force of the second adhesive 22 is weakened to remove the support member 10 from the plate 20. Next, the second adhesive 22 remaining on the upper surface of the plate 20 is removed using, for example, a stripping agent (S203). This completes the work of removing the old support member 10.

Next, with the plate 20 left on the concrete floor 1, a new support member 10A supporting a new installation object 2A is fixed to the plate 20 with the second adhesive 22. That is, the uncured second adhesive 22 is newly applied to the area of the surface of the plate 20 where the base 13 of the new support member 10A is to be installed (S204). Next, the base 13 of the new support member 10A is placed on the newly applied uncured second adhesive 22 (S205). Note that the second adhesive 22 may be applied to the surface of the base 13 of the new support member 10A in addition to or instead of the plate 20. Then, the newly applied second adhesive 22 is cured (S206). As a result, the base 13 of the new support member 10A is bonded to the plate 20. As a result, a fixing structure FS for fixing the new support member 10A is realized.

The new support member 10A may be fixed to the plate 20 by another adhesive 22A instead of the second adhesive 22. The other adhesive 22A may have, for example, similar properties to the second adhesive 22, but is not limited to this. The other adhesive 22A may be an adhesive having properties different from those of the second adhesive 22.

(Method 2 of modifying the fixing structure)
Next, another example of the method for modifying the fixing structure FS of this embodiment will be described. Fig. 8 is a cross-sectional view showing the fixing structure FS before and after modification. Fig. 8(a) shows the fixing structure FS before modification. Fig. 8(b) shows the fixing structure FS after modification.

Here, a modification method is described in which a new support member 10A supporting a new installation 2A is fixed not on the plate 20 left on the concrete floor 1, but on a new plate 20A newly installed on the concrete floor 1. Note that an example is taken in which the configuration of the new support member 10A is substantially the same as that of the existing support member 10. That is, the new support member 10A has, for example, a plate-shaped base 13. However, the new support member 10A may have a configuration different from that of the existing support member 10. The plate 20A has, for example, substantially the same material as the existing plate 20. However, the plate 20A may differ from the existing plate 20 in material, shape, and size.

Figure 9 is a flowchart showing an example of the flow of the method for modifying the fixed structure FS in this embodiment. Note that steps S201 to S203 are substantially the same as the modification method described with reference to Figure 7, so duplicated explanations will be omitted.

In the modification method described here, the old plate 20 is fixed to the concrete floor 1 by the first adhesive 21, and the new plate 20A is fixed to the concrete floor 1 while the old plate 20 is left on the concrete floor 1. That is, the first adhesive 21 is newly applied to the area on the surface of the concrete floor 1 where the new plate 20A is to be installed (S301). The area where the new plate 20A is to be installed is, for example, an area different from the area where the old plate 20 was installed.

Next, the new plate 20A is placed on the newly applied first adhesive 21 (S302). The first adhesive 21 may be applied to the surface of the new plate 20A in addition to or instead of the concrete floor 1. The newly applied first adhesive 21 is then hardened, for example by heating it (S303). This causes the new plate 20A to be bonded to the concrete floor 1. The new plate 20A is placed in a position below the base 13 of the new support member 10A.

At this time, for example, a force may be applied to the plate 20A toward the concrete floor 1, and the new plate 20A may be deformed according to distortion of the upper surface of the concrete floor 1. Note that the details of this operation are substantially the same as those of the above-mentioned operation for fixing the plate 20 to the concrete floor 1, so a duplicated explanation will be omitted.

Next, with the old plate 20 left on the concrete floor 1, the new support member 10A supporting the new installation 2A is fixed to the new plate 20A with the second adhesive 22. That is, the second adhesive 22 is newly applied to the area of the surface of the new plate 20A where the base 13 of the new support member 10A is to be installed (S304). Next, the base 13 of the new support member 10A is placed on the newly applied second adhesive 22 (S305). Note that the second adhesive 22 may be applied to the surface of the base 13 of the new support member 10A in addition to or instead of the new plate 20A. Then, the newly applied second adhesive 22 is hardened (S306). As a result, the base 13 of the new support member 10A is bonded to the new plate 20A. As a result, a fixing structure FS for fixing the new support member 10A is realized.

The new plate 20A may also be fixed to the concrete floor 1 by another adhesive 21A instead of the first adhesive 21. The other adhesive 21A may have, for example, similar properties to the first adhesive 21, but is not limited to this. The other adhesive 21A may also be an adhesive having properties different from those of the first adhesive 21.

The new support member 10A may be fixed to the new plate 20A by another adhesive 22A instead of the second adhesive 22. The other adhesive 22A may have, for example, similar properties to the second adhesive 22, but is not limited to this. The other adhesive 22A may be an adhesive having properties different from those of the second adhesive 22.

The method of modifying the fixed structure FS is not limited to the two examples described above. The "modification method" in this specification does not necessarily involve the installation of a new support member 10A, but may be a modification method in which a new support member 10A is not provided after the support member 10 is removed from the plate 20. In other words, the "modification method" may refer only to the removal of the old support member 10. In this case, the modification method is completed by the operation of S203 described in FIG. 7.

The configuration described above makes it possible to provide a fixing structure, a fixing method, and a method for modifying a fixing structure that ensure the fixing strength of an object to a concrete floor without using post-installed anchors and that can be modified relatively easily. In other words, the support members for an object to be installed in a building must be firmly fixed to the concrete floor so that the object will not fall over, even in the event of an earthquake, for example. Post-installed anchors are generally used for such fixing.

However, using post-installed anchors requires extensive construction work. This can lead to issues such as noise and vibrations during construction. In addition, when using post-installed anchors, holes must be drilled into the concrete floor, which can lead to issues such as destruction of the concrete floor and damage to objects (rebar and other buried objects) buried in the concrete floor, as well as limitations on the location of holes for post-installed anchors due to these buried objects.

Furthermore, installations in buildings may be updated due to product evolution or for other reasons. At this time, the support members that support the installation may also need to be replaced with new support members depending on the weight and size of the new installation and the required earthquake resistance. In such cases, if post-installed anchors are used, the anchor bolts are removed from the concrete floor. However, anchor bolts are generally removed from the concrete floor by cutting the tips embedded in the concrete floor. For this reason, the tips of the cut anchor bolts remain in the concrete floor. As a result, it is no longer possible to install new anchor bolts in positions where anchor bolts were previously installed.

For this reason, it is possible to fix the support member that supports the installation to the concrete floor with an adhesive. Here, adhesives that can ensure adhesive strength to the concrete floor tend to firmly bond the support member and the concrete floor. For this reason, when attempting to remove the support member from the concrete floor in response to updating the installation, if the concrete floor is thin or has low strength, there is a possibility that the concrete floor will be destroyed. On the other hand, there are adhesives that have weaker adhesive strength than the adhesives mentioned above, or adhesives whose adhesive strength can be weakened by applying a stripping agent or heat, but it is difficult to ensure the necessary adhesive strength with these adhesives to the concrete floor.

Therefore, the fixing structure FS of this embodiment has a support member 10 that supports the installation object 2, a plate 20 arranged between the support member 10 and the concrete floor 1, a first adhesive 21 provided between the plate 20 and the concrete floor 1, and a second adhesive 22 provided between the support member 10 and the plate 20. With this configuration, the plate 20 and the concrete floor 1 can be firmly fixed by selecting an adhesive that can ensure the necessary adhesive strength for the concrete floor 1 as the second adhesive 22. On the other hand, the necessary adhesive strength can be ensured between the support member 10 and the plate 20 by the second adhesive 22. Here, since the plate 20 is provided between the support member 10 and the concrete floor 1, when the support member 10 is removed, the concrete floor 1 is less likely to be destroyed than when the support member 10 is directly adhered to the concrete floor 1. This allows the support member 10 to be fixed to the concrete floor 1 without using post-installed anchors, and it is possible to avoid noise and vibrations during construction, destruction of the concrete floor, risk of damage to objects buried in the concrete floor surface, and restrictions on hole positions due to these buried objects.

In addition, according to the configuration of this embodiment, when replacing the support member 10, the existing plate 20 can be left on the concrete floor 1, and the new support member 10A can be fixed on top of the existing plate 20. This reduces the cost of the parts required for the replacement work and improves the efficiency of the work itself.

In this embodiment, the second adhesive 22 is a different type of adhesive from the first adhesive 21. That is, since the plate 20 is provided between the support member 10 and the concrete floor 1, the second adhesive 22 does not need to have high adhesion to the concrete floor 1, and an adhesive that takes into consideration the removability of the support member 10 when it is renewed can be used as long as the necessary adhesive strength is ensured for the materials of the support member 10 and the plate 20. For example, by using an adhesive that makes it easier to remove the support member 10 compared to the first adhesive 21 as the second adhesive 22 (for example, an adhesive with a weaker adhesive strength than the first adhesive 21, or an adhesive whose adhesive strength is weakened by the application of a stripping agent or heat), the support member 10 can be easily removed from the plate 20.

In this embodiment, the first adhesive 21 is a thermosetting adhesive. The second adhesive 22 is a room temperature curing adhesive. In general, a thermosetting adhesive has a higher adhesive strength than a room temperature curing adhesive. Therefore, with the above configuration, it is possible to ensure a high adhesive strength to the concrete floor 1 and also to make it easier to remove the support member 10 from the plate 20.

In this embodiment, the first adhesive 21 is an adhesive that has the ability to be impregnated into concrete. The second adhesive 22 is an adhesive that has no ability to be impregnated into concrete or has a lower ability to be impregnated into concrete than the first adhesive 21. This configuration can ensure even higher adhesive strength to the concrete floor 1. In addition, it may become easier to remove the support member 10 from the plate 20.

In this embodiment, the particles contained in the first adhesive 21 are smaller than the particles contained in the second adhesive. This configuration can ensure even higher adhesive strength to the concrete floor 1. In addition, it may become easier to remove the support member 10 from the plate 20.

In this embodiment, the second adhesive 22 is more soluble in a predetermined solvent than the first adhesive 21. This configuration makes it easier to remove the support member 10 from the plate 20. This improves the workability of the replacement work for the installation object 2 and the support member 10.

In this embodiment, when the second adhesive 22 is heated, its adhesive strength weakens at a lower temperature than the first adhesive 21. This configuration makes it easier to remove the support member 10 from the plate 20. This improves the workability of replacing the installation 2 and the support member 10. In addition, by appropriately managing the heating temperature (for example, by managing the heating temperature to the above-mentioned "specific temperature"), it is possible to prevent the adhesive strength of the first adhesive 21 from weakening.

In this embodiment, the adhesion area of the first adhesive 21 is larger than the adhesion area of the second adhesive. This configuration ensures high adhesive strength to the concrete floor 1 and makes it easier to remove the support member 10 from the plate 20.

Second Embodiment
Next, a fixing structure FS according to a second embodiment will be described. The second embodiment differs from the first embodiment in that the base 13 of the support member 10 has a plurality of through holes 41. Note that the configuration other than that described below is the same as that of the first embodiment.

Figure 10 is a cross-sectional view showing the fixing structure FS and concrete floor 1 of the second embodiment. In this embodiment, the base 13 of the support member 10 has multiple through holes 41. The through holes 41 penetrate the base 13 in the vertical direction. The through holes 41 are, for example, holes provided for conventional post-installed anchors, but may also be holes provided for another purpose.

In this embodiment, a portion of the second adhesive 22 penetrates into each of the through holes 41 and adheres to the inner circumferential surface of the through holes 41. This further increases the lateral slippage strength of the support member 10 relative to the plate 20.

In this embodiment, when the second adhesive 22 is heated to weaken the adhesive strength of the second adhesive 22, for example, a heater is inserted inside the through hole 41 to directly heat the portion of the second adhesive 22 exposed inside the through hole 41. This makes it easier to heat the entire area of the second adhesive 22 more uniformly than in the first embodiment. As a result, the support member 10 can be more easily removed from the plate 20.

Third Embodiment
Next, a fixing structure FS according to a third embodiment will be described. The third embodiment differs from the first embodiment in that the plate 20 is provided in common for a plurality of installation objects 2. Note that the configuration other than that described below is the same as that of the first embodiment.

Figure 11 is a perspective view showing an installation object 2, a fixing structure FS, and a concrete floor 1 of the third embodiment. In this embodiment, the plate 20 is provided integrally with the multiple installation objects 2 (multiple support members 10). In more detail, the support member 10 of each installation object 2 includes four bases 13, namely, a first base 13A, a second base 13B, a third base 13C, and a fourth base 13D, which are arranged corresponding to the four corners of each installation object 2. The multiple plates 20 also include a first plate 51 and a second plate 52.

The first plate 51 is formed in a rectangular shape and extends below the first base 13A and the second base 13B of the multiple installations 2. The first plate 51 is fixed to the concrete floor 1 by a first adhesive 21. The first plate 51 is fixed to the first base 13A and the second base 13B of the multiple installations 2 by a second adhesive 22.

The second plate 52 is formed in a rectangular shape and extends below the third base 13C and the fourth base 13D of the multiple installations 2. The second plate 52 is fixed to the concrete floor 1 by a first adhesive 21. The second plate 52 is fixed to the third base 13C and the fourth base 13D of the multiple installations 2 by a second adhesive 22.

Figure 12 is a plan view showing the installation object 2, the fixing structure FS, and the concrete floor 1 before and after the modification. (a) in Figure 12 shows the state before the modification is made. (b) in Figure 12 shows the state after the modification is made. Figure 12 shows an example in which a new plate 20A supporting a new support member 10A is installed as part of the fixing structure after the modification. In this embodiment, the new plate 20A is installed below the third base 13C and the fourth base 13D of the new support member 10A. The third base 13C and the fourth base 13D of the new support member 10A are fixed to the new plate 20A by the newly applied second adhesive 22 or another adhesive 22A. Meanwhile, the first base 13A and the second base 13B of the new support member 10A are fixed to the existing plate 51 by the newly applied second adhesive 22 or another adhesive 22A.

As shown in FIG. 12, when the installation 2 is renewed, the size of the new installation 2A may be larger than the size of the old installation 2. In such a case, by installing new plates 20A only in the necessary places, it is possible to flexibly accommodate modifications to the installation 2.

Above, the first to third embodiments have been described. However, the embodiments are not limited to the above examples. For example, the concrete floor 1 on which the fixing structure FS is provided may be a floor surface in which the surface of the concrete material has been finished (for example, dust-proof coating has been applied). For example, the member provided between the support member and the concrete floor is not limited to a plate, and may be a block (for example, a metal block) or the like. Therefore, the "plate" in this specification may be read as an "intermediate member" or an "intervening member", etc. In other words, the "plate" is an example of an "intermediate member" or an "intervening member". In addition, the first adhesive 21 and the second adhesive 22 may be the same type of adhesive.

FS...fixed structure, 1...concrete floor, 2...installation, 10, 10A...support member, 11...support member body, 12...support shaft, 13...base, 20, 20A...plate, 21...first adhesive, 22...second adhesive.

Claims (6)

A fixing structure for fixing an object to a concrete floor surface without using a post-installed anchor,
A plate disposed between the concrete floor and the installation object;
a first layer of adhesive in contact with the concrete floor surface and the first side of the plate;
a second adhesive layer in contact with the second surface of the plate and a lower surface of the support member that supports the object to be installed;
the first adhesive fixes the plate to the concrete floor surface as it hardens;
The second adhesive fixes the object to the surface of the plate by hardening,
the object is fixed to the concrete floor surface by an adhesive force between the second adhesive and the first adhesive, the adhesive force being lower than the upper limit of the heat resistance temperature of the first adhesive;
When the temperature of the second adhesive is increased from a temperature lower than the upper limit of the heat resistance temperature of the second adhesive to a specific temperature lower than the upper limit of the heat resistance temperature of the first adhesive and higher than the upper limit of the heat resistance temperature of the second adhesive, the adhesive strength of the second adhesive is weakened,
A fixing structure, characterized in that the adhesive strength of the first adhesive is not significantly weakened even when the temperature of the first adhesive is increased to the specific temperature. The fixing structure according to claim 1 , wherein the plate is provided between the first adhesive and the second adhesive. a support member for supporting the object to be installed so as to be fixed to the concrete floor surface,
The plate is
The first surface faces the concrete floor surface via the first adhesive layer, and the second surface faces the support member via the second adhesive layer.
The fixing structure according to claim 1 . the first adhesive is a thermosetting adhesive;
The second adhesive is a room temperature curing adhesive.
The fixing structure according to claim 1 . The first adhesive is an adhesive that has a property of being impregnated into concrete,
The second adhesive is an adhesive that has no impregnation into concrete or has a smaller impregnation into concrete than the first adhesive.
The fixing structure according to claim 1 . The support member has a plate-shaped base on a surface thereof, and a hole penetrating the base is provided.
The fixing structure according to claim 3 , wherein a portion of the second adhesive before hardening is allowed to be discharged from the layer of the second adhesive through the hole to an upper portion of the base.

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