JP7364387B2 - fixed structure - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to a fixing structure .

Post-installed anchors are generally used when fixing installed items to a concrete floor surface. That is, by drilling holes in a concrete floor surface using a drill or the like and embedding anchor bolts in the drilled holes, the support member that supports the installed object is fixed to the floor surface.

Japanese Patent Application Publication No. 2006-118317

By the way, when using post-installation anchors, there is a risk that the bottom surface of the floor will peel off if the floor is thin or if it hits a weak part of the concrete, and there is a risk of the anchors being buried under the concrete floor (such as reinforcing bars or other objects). There are issues such as the risk of damage to buried objects), restrictions on hole positions for post-installed anchors due to buried objects, and noise and vibration during construction.

The present invention has been made in view of the above circumstances, and provides a fixing structure that can secure the fixing strength of an installed object to a concrete floor surface without using post-installation anchors.

(1) A fixing structure according to one aspect of the present invention is a fixing structure for fixing an installed object to a concrete floor surface, the supporting member supporting the installed object, and the supporting member and the floor surface being connected to each other. an adhesive provided between the adhesive surface for bonding the adhesive surface to the floor surface and fixing the support member to the floor surface; and a stress level generated on the adhesive surface due to the tensile force applied to the support member; It is characterized by comprising a stress dispersion section for distributing stress on the adhesive surface.

(2) In the above fixed structure, the value (maximum value) of the stress distribution is smaller than the limit value of the adhesive strength of the adhesive.

(3) In the above fixed structure, the value (maximum value) of the stress distribution is smaller than the limit value of the concrete strength of the floor surface.

(4) In the above fixing structure, regarding the stress distribution generated on the adhesive surface, the rate of change of the stress distribution in the direction along the adhesive surface is higher at the center than at both ends of the adhesive surface. small.

(5) In the above fixed structure, the stress distribution section is arranged between the support member and the floor surface, has a thickness that is greater than or equal to the thickness of the support member, and has a thickness that is equal to or greater than the thickness of the support member, and that and a coupling portion for fixing the support member to the plate.

(6) In the above fixing structure, the coupling portion includes any one of a fastening bolt, adhesive, and welding for fixing the support member to the plate.

(7) In the above fixing structure, the coupling portion fixes the supporting member to the plate in a coupled state, and when the coupled state is released, the supporting member is fixed to the plate while leaving the plate on the floor surface. It becomes possible to remove it from the plate.

(8) In the above fixing structure, the support member becomes plastic before the maximum value of the stress distribution generated on the adhesive surface exceeds a limit value of the adhesive strength of the adhesive.

(9) In the above fixing structure, the supporting member is provided with a rib portion on the upper surface and the adhesive surface on the lower surface, and the rib portion acts as the stress dispersion portion by the tensile force applied to the supporting member. The degree of stress generated on the adhesive surface is dispersed over the adhesive surface.

(10) A fixing method according to one aspect of the present invention is a fixing method for fixing an installed object to a concrete floor surface, the adhesive surface of the supporting member being such that the installed object is supported by the supporting member. is fixed to the floor surface using an adhesive, and the stress level generated on the adhesive surface due to the tensile force applied to the support member is dispersed by a stress level dispersion section provided in correspondence with the support member. It is characterized by

According to the present invention, it is possible to provide a fixing structure that can secure the fixing strength of an installed object to a concrete floor surface without using post-installed anchors.

It is a sectional view showing an installation object, a fixing structure, and a concrete floor of a 1st embodiment. FIG. 2 is an enlarged cross-sectional view of a region surrounded by line F2 in FIG. 1. FIG. 3 is a plan view of the fixing structure FS shown in FIG. 2. FIG. 4 is a sectional view taken along line F4-F4 in FIG. 3. FIG. 4 is a diagram for explaining the stress distribution in the cross-sectional direction of the plate along the line F4-F4 in FIG. 3. FIG. It is a flowchart which shows an example of the flow of the fixing method of 1st Embodiment. It is a flowchart which shows an example of the flow of the exchange method of 1st Embodiment. FIG. 7 is a plan view of a fixed structure FS of a second embodiment. 6 is a sectional view taken along line F9-F9 in FIG. 5. FIG. It is a top view of fixed structure FS of a 3rd embodiment. 11 is a sectional view taken along line F11-F11 in FIG. 10. FIG. It is a top view of fixed structure FS of a 4th embodiment. 13 is a sectional view taken along line F13A-F13A in FIG. 12. FIG. 13 is a sectional view taken along line F13B-F13B in FIG. 12. FIG. 13 is a diagram for explaining the stress distribution in the cross-sectional direction of the plate along the line F13A-F13A in FIG. 12. FIG.

The fixing structure and fixing method of the embodiment will be described below.
In the following description, components having the same or similar functions are given the same reference numerals. Further, redundant explanations of these configurations may be omitted.

(First embodiment)
The fixed structure FS of the first embodiment can be widely used, for example, in communication facilities, data centers, and various other facilities, and is made of a concrete floor 1 (for example, a floor slab, hereinafter referred to as "concrete floor 1"). ) is a fixing structure that fixes the installed object 2 to the In other words, in this specification, "fixing the installed item to the concrete floor" is not limited to directly fixing the installed item itself to the concrete floor, but also refers to fixing the support member that supports the installed item to the concrete floor. This also includes cases in which installed objects are prevented from moving relative to the concrete floor by doing so.

In this embodiment, the installed objects 2 fixed by the fixed structure FS include various devices installed in the building (for example, communication exchanges, air conditioners, various power system devices (batteries)), and devices installed in the building. These include members for forming heavy beds. However, the installed object 2 fixed by the fixed structure FS is not limited to a specific device, device, or member, and can include a wide variety of devices, devices, and members.

(Fixed structure)
First, the fixed structure FS of the first embodiment will be explained. FIG. 1 is a sectional view showing an installation 2, a fixed structure FS, and a concrete floor 1 according to the first embodiment. In addition, in FIG. 1, illustration of the plate and adhesive included in the fixed structure FS is omitted for convenience of explanation.

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

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

The support shaft 12 protrudes downward from the lower end of the support member main body 11. The support shaft 12 is formed in the shape of a shaft extending in the vertical direction, and is arranged substantially perpendicularly to the concrete floor 1. The support shaft 12 is arranged corresponding to the four corners of the support member main body 11 in plan view.
However, the arrangement position of the support shaft 12 is not limited to the above example.

The base 13 is arranged at the lowest part of the support member 10. The base 13 is formed into a plate shape substantially parallel to the upper surface of the concrete floor 1. The base 13 has a polygonal shape (for example, a quadrangular shape, an octagonal shape, etc.), but may have a circular shape or other shapes. Hereinafter, an octagonal shape will be explained as an example. The base 13 is connected to the lower end of the support shaft 12 and supports the support shaft 12 from below. The base 13 of the embodiment has a plurality of through holes 41H (FIG. 4) as described later. Each through hole 41H penetrates in a direction perpendicular to the plate-shaped surface of the base 13. Each through hole 41H is used for fixing to the plate 20, which will be described later.

FIG. 2 is an enlarged cross-sectional view of a region surrounded by line F2 in FIG. FIG. 3 is a plan view of the fixing structure FS shown in FIG. 2. FIG. 4 is a sectional view taken along line F4-F4 in FIG. In addition, in FIG. 3, for ease of understanding, the first adhesive 21 and the surplus portion 21OF of the first adhesive 21 are hatched in a dot pattern. As shown in FIGS. 2 to 4, the fixing structure FS includes a plate 20, a first adhesive 21, and a coupling portion 41 in addition to the support member 10 described above.

The plate 20 is formed into a plate shape along the upper surface of the concrete floor 1. Plate 20 is arranged between support member 10 and concrete floor 1. In this embodiment, the plate 20 is arranged between the base 13 of the support member 10 and the concrete floor 1.
The plate 20 is made of metal (for example, steel), for example. The plate 20 is made of, for example, substantially the same material as the base 13 of the support member 10.

The thickness T1 of the plate 20 is set to a thickness that does not easily cause elastic deformation in response to, for example, distortion of the upper surface of the concrete floor 1. The thickness T1 of the plate 20 is preferably greater than or equal to the thickness T2 of the base 13 (see FIG. 2). For example, if the plate 20 has a thickness T1 of about 6 mm, the base 13 has a thickness T2 of about 4.5 to 6 mm. The above dimensions are an example and are not limited thereto.

The plate 20 has a larger outer shape than the base 13 in plan view (see FIG. 3). Here, for convenience of explanation, a first direction X, a second direction Y, and a third direction Z are defined. The first direction X and the second direction Y are directions substantially parallel to the upper surface of the concrete floor 1, respectively. The second direction Y is a direction substantially orthogonal to the first direction X. When such a first direction X and a second direction Y are defined, 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. The third direction Z is a direction substantially perpendicular to the upper surface of the concrete floor 1 (for example, a vertical direction). The third direction Z is called the plate cross-sectional direction.

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 plate cross-sectional direction (vertical direction in this embodiment). On the other hand, the second region 32 is located closer to the outer periphery of the plate 20 than the first region 31, and is a region that does not overlap with the base 13 of the support member 10 in the cross-sectional direction of the plate. Note that since the base 13 is located on the plate 20, it does not come off the first region 31.

The first adhesive 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, for example, a characteristic capable of fixing the metal plate 20 and the concrete floor 1 with a desired adhesive strength. The first adhesive 21 is provided, for example, on the entire surface (entire area) of the plate 20. That is, the first adhesive 21 is provided in both the first region 31 and the second region 32 of the plate 20. Thereby, the plate 20 and the concrete floor 1 can be fixed with desired fixing strength. Note that the first adhesive 21 may be an elastic adhesive having desired softness (elasticity). In other words, the first adhesive 21 may have a relatively small Young's modulus (elastic modulus).

Note that a through hole 20AH for air venting is provided in a part of the plate 20.
The through hole 20AH penetrates the plate 20 in the plate cross-sectional direction (thickness direction). The through hole 20AH may be, for example, a conventional hole provided for a post-installed anchor, or may be a hole provided for another purpose.

A part of the first adhesive 21 enters inside each of the through holes 20AH together with the air sealed in the lower part of the plate 20, and overflows to the upper surface side of the plate 20 through the through holes 20AH. Reference numeral 21OF indicates the overflowing first adhesive 21. As a result, by minimizing air pockets at the bottom of the plate 20 and securing a large bonding area by the first adhesive 21 (bonding area between the plate 20 and the concrete floor 1 by the first adhesive 21), the fixing strength is increased. Increase. It may also be applied to other embodiments to be described later.

The coupling portion 41 fixes the support member 10 to the plate 20. The coupling portion 41 may be, for example, a bolt. In this case, the plate 20 is preferably provided with a screw hole 20H that fits into the bolt described above. The bolt (fastening bolt) as the coupling portion 41 and the screw hole 20H fix the metal support member 10 and the metal plate 20.

The coupling portion 41 is provided near the outer periphery of the base 13, for example. In other words, the coupling portion 41 is provided inside the circumference of the first region 31 and near the circumference. The coupling portion 41 is not provided in a region near the center of the first region 31 of the plate 20 or in the second region 32 of the plate 20 . For example, the distance between the coupling portions 41 in the X-axis direction is indicated by W3X, and the distance between the coupling portions 41 in the Y-axis direction is indicated by W3Y. In this case, W3X is shorter than W2X by a predetermined length, and W3Y is shorter than W2Y by a predetermined length. The above difference is defined to be relatively small within the range allowed by the strength of the base 13.

Since the base 13 and the plate 20 are not joined to each other except at the connecting portion 41, the tensile force from the base 13 to the plate 20 is transmitted from the base 13 to the plate 20 through the connecting portion 41. If the value of the stress distribution between the concrete floor 1 and the plate 20 (adhesive surface) at that time is smaller than the adhesive strength limit value AFL of the first adhesive 21, the first adhesive 21 will peel off. There isn't. In addition, if the value (maximum value) of the stress distribution between the concrete floor 1 and the plate 20 (adhesion surface) at that time is smaller than the concrete strength limit value of the concrete floor 1, the concrete floor 1 will be destroyed. Not at all.

For example, before the value (maximum value) of the stress distribution applied between the concrete floor 1 and the plate 20 (adhesion surface) exceeds the adhesive strength limit value AFL of the first adhesive 21, the base 13 of the support member 10 Alternatively, the base 13 may be formed to be plastic and have tough fracture properties.

Note that the stress distribution in the cross-sectional direction of the plate applied between the concrete floor 1 and the plate 20 preferably satisfies the following conditions. FIG. 5 is a diagram for explaining the stress distribution in the cross-sectional direction of the plate along line F4-F4 in FIG. The upper side of each of FIGS. 5(a) and 5(b) schematically shows the stress (thick arrow) in the plate 20 when a tensile force is applied to the support shaft 12, and the lower side of each shows the stress generated on the adhesive surface. The stress distribution (thin arrow) is schematically shown. FIG. 5(a) illustrates the case of this embodiment, and FIG. 5(b) illustrates a comparative example of this embodiment.

As shown in the upper part of FIG. 5(a), the tensile stress applied to the base 13 is distributed to each joint 41. Although the base 13 is deformed by the tensile force applied to the support member 10, the amount of deformation of the base 13 shown in the figure is emphasized. As shown in the lower part of FIG. 5A, the stress distribution in the cross-sectional direction of the plate is large near the bottom of each joint 41. As a result, the rate of change in the stress distribution in the direction along the adhesive surface is smaller at the center than at both ends of the adhesive surface, thereby dispersing the stress and making the stress distribution uniform. , it is possible to configure so that there is no part where the adhesive strength of the first adhesive 21 exceeds the limit value AFL.

The comparative example shown in FIG. 5B is an example in which a second adhesive is applied between the base 13Z and the plate 20Z to bond the entire lower surface of the base 13Z. In this case, the stress distribution is concentrated in the range where the base 13Z exists (particularly under the support shaft 12) with respect to the entire area of the plate 20Z, and exceeds the adhesive strength limit value AFL of the first adhesive 21. There is.

When comparing the stress distribution shown in FIG. 5(a) of the embodiment and the distribution shown in FIG. 5(b) of the comparative example, there is a clear difference. It can be seen that the support member 10 can be supported because the stress distribution that exceeds the limit value AFL of the adhesive strength of the adhesive 21 does not occur. It is preferable to determine the combination of the base 13, the plate 20, and the first adhesive 21 so that the stress distribution is as shown in FIG. 5(a).

(Fixing method using fixed structure)
Next, a method for fixing the installation object 2 using the fixing structure FS of this embodiment will be explained. FIG. 6 is a flowchart showing an example of the flow of the fixing method of this embodiment.

First, the first adhesive 21 is applied to the area on the surface of the concrete floor 1 where the plate 20 is to be installed (S102). Next, the plate 20 to which the base 13 is fixed is placed on the applied first adhesive 21 (S104). 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, the first adhesive 21 is cured (S106). Thereby, the plate 20 is adhered to the concrete floor 1. Note that the base 13 does not need to be fixed to the plate 20 in advance; the base 13 may be fixed to the plate 20 after the plate 20 is adhered to the concrete floor 1.

Thereby, a fixing structure FS for fixing the installation object 2 to the concrete floor 1 is realized. Thereafter, the installation object 2 is fixed to the support member 10.
Thereby, the installation object 2 is fixed to the concrete floor 1.

(How to replace fixed structure)
Next, a method of exchanging the fixed structure FS of this embodiment will be explained. FIG. 7 is a flowchart showing an example of the flow of the exchange method of this embodiment. Here, it is assumed that the condition is that the base 13 needs to be replaced.

First, it is determined whether or not the plate 20 needs to be replaced (S205).
If the plate 20 does not need to be replaced, that is, if the plate 20 is left and the base 13 is replaced (S205: NO), loosen the coupling part 41 (bolt) and remove the base 13 from above the plate 20 (S205: NO). S210), the plate 20 is left in place. Next, another base (base 13x) in place of the base 13 is newly placed on the remaining plate 20 (S212). Next, the connecting portion 41 (bolt) is tightened to fix the base 13x to the plate 20 (S214). Note that the base 13x may have the same structure as the base 13 before replacement, for example.

If the plate 20 needs to be replaced (S205: YES), the first adhesive 21 is peeled off and the plate 20 is removed (S220). Next, it is determined whether the first adhesive 21 is adhered to the adhesive surface of the area where the plate 20x replacing the plate 20 is to be newly arranged (S222). If the first adhesive 21 is not fixed to the adhesive surface, the process proceeds to step S226 (S222: NO). If the first adhesive 21 is stuck to the adhesive surface (S222: YES), the first adhesive 21 stuck to the adhesive surface is removed (S224). Next, the first adhesive 21 is newly applied to the area where the plate 20x will be newly placed (S226). Next, the plate 20x to which the base 13x is bonded is newly placed on the first adhesive 21 (S228), and the first adhesive 21 is cured (S230). Note that when the first adhesive 21 has desired softness (elasticity) (for example, when it is an elastic adhesive), it is easy to peel or remove. When the plate 20 is removed as described above, if the first adhesive 21 is stuck to the adhesive surface, by removing the stuck first adhesive 21, the replaced plate 20x and concrete The adhesive strength with the floor 1 can be increased. Note that the base 13x may have the same structure as the base 13 before replacement, or may have different structures as long as desired conditions are met.

According to the configuration described above, it is possible to provide a fixing structure and a fixing method that can ensure the fixing strength of an installed object to the concrete floor 1 without using post-installed anchors. That is, the support member for an installation installed in a building needs to be firmly fixed to the concrete floor 1 so that the installation does not fall over even in the event of an earthquake, for example.

When performing such fixing, post-installed anchors are generally used.
However, in order to use post-installation anchors, extensive construction is required. Therefore, noise and vibration during construction may become an issue. In addition, when using post-installation anchors, it is necessary to drill holes in the concrete floor, so if the floor is thin or hits a weak part of the concrete, the underside of the floor may peel off or the concrete floor may become damaged. Problems arise, such as the possibility of damage to buried objects (reinforcing bars and other buried objects), and restrictions on hole positions for post-installed anchors due to these buried objects.

In addition, equipment installed in buildings may be updated due to product evolution or other reasons. At this time, the support member that supports the installed object may also need to be replaced with a new support member depending on the weight and size of the new installed object and the required earthquake resistance. In such cases, if post-installation anchors are used, remove the anchor bolts from the concrete floor. However, anchor bolts are generally removed from the concrete floor by cutting off the end portion buried in the concrete floor. Therefore, the tip of the cut anchor bolt remains on the concrete floor. As a result, a new anchor bolt cannot be installed at a position where an anchor bolt was installed in the past.

Therefore, it is conceivable to fix the support member that supports the installed object to the concrete floor with an adhesive. Here, an adhesive that can ensure adhesive strength to a concrete floor tends to firmly adhere the supporting member and the concrete floor. For this reason, when attempting to remove supporting members from a concrete floor in response to renewal of installed items, there is a possibility that the concrete floor will be destroyed if the thickness of the concrete floor is thin or the strength of the concrete floor is low. There is. On the other hand, there are adhesives that have lower adhesive strength than the adhesives mentioned above, or adhesives whose adhesive strength can be weakened by applying a release agent or heat, but these adhesives cannot be used on concrete floors. It is difficult to secure the necessary adhesive strength.

Therefore, the fixed structure FS of this embodiment is provided with a support member 10 that supports the installation object 2, and between the support member 10 and the concrete floor 1, and the adhesive surface is bonded to the concrete floor 1, and the support member 10 is By having the first adhesive 21 for fixing to the concrete floor 1 and the stress dispersion section for dispersing the stress generated on the adhesive surface due to the tensile force applied to the support member 10, the It is possible to secure the fixing strength of the installed object to the concrete floor surface without using construction anchors.

For example, the stress distribution section described above has a thickness that is greater than or equal to the thickness of the base 13 of the support member 10 and includes a plate 20 having an adhesive surface and a coupling section 41 that fixes the support member 10 to the plate 20. has. According to such a configuration, by selecting an adhesive that can secure the necessary adhesive strength to the concrete floor 1 as the first adhesive 21, the plate 20 and the concrete floor 1 can be fixed with the desired fixing strength. can do. On the other hand, the support member 10 and the plate 20 can be coupled with the necessary strength by the coupling portion 41 (bolt). Here, since the plate 20 is provided between the support member 10 and the concrete floor 1, when removing the support member 10, it is easier to remove the support member 10 than when the support member 10 is directly bonded to the concrete floor 1. Therefore, the concrete floor 1 is hard to be destroyed. Therefore, the supporting member 10 can be fixed to the concrete floor 1 without using a construction anchor later, which prevents noise vibration during construction, destruction of the concrete floor, and damage to buried objects buried in the concrete floor surface. This makes it possible to avoid the possibility of problems such as problems caused by buried objects, and restrictions on hole positions caused by buried objects.

According to the embodiment described above, the connecting portion 41 fixes the support member 10 to the plate 20 in the connected state, and when the connected state is released, the base 13 remains on the concrete floor 1 while the base 13 is fixed to the plate 20. 20, and another base 13x may be fixed to the plate 20. Thereby, the support member 10 can be removed from the plate 20 as needed without fixing the support member 10 to the concrete floor 1 using a post-installation anchor.

(Second embodiment)
Next, the fixed structure FS of the second embodiment will be explained. The second embodiment differs from the first embodiment in that the connecting portion 41 (bolt) is not used. Note that the configuration other than those described below is the same as the configuration of the first embodiment.

FIG. 8 is a plan view of the fixed structure FS of the second embodiment. FIG. 9 is a sectional view taken along line F9-F9 in FIG. In addition, in FIG. 8, for ease of understanding, the first adhesive 21 and the surplus portion 21OF of the first adhesive 21 are hatched in a dot pattern. As shown in FIGS. 8 and 9, the fixing structure FS includes a plate 20, a first adhesive 21, and a coupling portion 42 in addition to the support member 10 described above.

The base 13 of this embodiment is welded to the plate 20 in advance at the joint portion 42. Therefore, although the base 13 cannot be easily removed from the plate 20, it is possible to ensure the same fixing strength as in the first embodiment. For example, the coupling portion 42 has a linear shape along the outer periphery.
Note that when replacing the base 13, it is preferable to replace the entire plate 20.

As described above, even when the base 13 and the plate 20 are welded, the same effects as in the first embodiment can be achieved.

(Third embodiment)
Next, the fixed structure FS of the third embodiment will be explained. The third embodiment differs from the first embodiment in that the connecting portion 41 (bolt) is not used. Note that the configuration other than those described below is the same as the configuration of the first embodiment.

FIG. 10 is a plan view of the fixed structure FS of the third embodiment. FIG. 11 is a cross-sectional view taken along line F11-F11 in FIG. In addition, in FIG. 10, for ease of understanding, the first adhesive 21, the surplus portion 21OF of the first adhesive 21, and the second adhesive 22 are hatched in a dot pattern. As shown in FIGS. 10 and 11, the fixed structure FS includes a plate 20, a first adhesive 21, and a second adhesive 22 in addition to the support member 10 described above.

The base 13 of this embodiment is bonded to the plate 20 with a second adhesive 22. Therefore, although the base 13 cannot be removed from the plate 20 as easily as the joint 41, the base 13 can be removed from the plate 20 by physical or chemical treatment.

The second adhesive 22 of the embodiment is applied to the outer periphery of the base 13 when the plate 20 is viewed from above. As a result, the portion where the plate 20 is joined to the base 13 forms an annular shape along the outer periphery of the base 13, and a gap is created inside the annular shape.

As described above, the fixed structure FS of this embodiment includes the support member 10 that supports the installation object 2, the plate 20 disposed between the support member 10 and the concrete floor 1, and the plate 20 and the concrete floor 1. A first adhesive 21 is provided between the support member 10 and the plate 20, and a second adhesive 22 is provided between the support member 10 and the plate 20.

According to such a configuration, by selecting an adhesive that can secure the necessary adhesive strength to the concrete floor 1 as the first adhesive 21, the plate 20 and the concrete floor 1 can be fixed with the desired fixing strength. can do. On the other hand, the second adhesive 22 can ensure the necessary adhesive strength between the support member 10 and the plate 20.

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 adhesiveness to the concrete floor 1, and has a high adhesiveness to the materials of the support member 10 and the plate 20. As long as the necessary adhesive strength can be ensured, it is possible to use an adhesive that takes into account removability when the support member 10 is renewed.

The first to third embodiments have been described above. However, embodiments are not limited to the above example. For example, the concrete floor 1 on which the fixed structure FS is provided may be a floor surface of a concrete material whose surface has been subjected to finishing processing (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, but may be a block (for example, a metal block) or the like. Therefore, the "plate" in this specification may be read as "intermediate member" or "intervening member". In other words, the "plate" is an example of an "intermediate member" or an "intervening member". Moreover, the first adhesive 21 and the second adhesive 22 may be adhesives of the same type.

(Fourth embodiment)
Next, the fixed structure FS of the fourth embodiment will be explained. The fourth embodiment differs from the first embodiment in that it does not include the plate 20, the coupling portion 41, and the like. Note that the configuration other than those described below is the same as the configuration of the first embodiment.

FIG. 12 is a plan view of the fixing structure FS of the fourth embodiment. FIG. 13A is a cross-sectional view taken along line F13A-F13A in FIG. 12. FIG. 13B is a cross-sectional view taken along line F13B-F13B in FIG. 12. Note that in FIG. 12, the first adhesive 21 is hatched in a dot pattern for easy understanding. As shown in FIGS. 12, 13A, and 13B, the fixing structure FS includes a first adhesive 21 in addition to the support member 10 described above.

The fixed structure FS of this embodiment includes a base 13A instead of the base 13. The base 13A will be explained in comparison with the case of the base 13 using the plate 20. The base 13A of the embodiment is arranged at the lowest part of the support member 10 similarly to the base 13 described above. A reinforcing member is provided on the upper surface of the base 13A. An adhesive surface is provided on the lower surface of the base 13A.
As shown in the figure, the base 13A includes ribs 13R. The ribs 13R assembled in the grid are reinforcing members, and are provided so as to be parallel to the diagonal of the base 13A, for example, and are welded to the upper surface of the base 13A.

For example, the width and height of the rib 13R may be determined so as to obtain a desired fixing strength. The length of the rib 13R is preferably extended to the vicinity of the side of the base 13A. By providing the ribs 13R, the weight can be reduced compared to the case where the base 13A is made thicker, and the fixing strength can be increased compared to the case where the base 13A is used alone.

The configuration of the rib 13R described above is an example and is not limited thereto. For example, the ribs 13R may be arranged parallel to the sides of the square base 13A. The width and height of the rib 13R may be changed as appropriate. The spacing between the ribs 13R formed by parallel grids may be determined as appropriate. Note that the shape of the ribs 13R is not limited to being a cross-shaped grid made up of two parallel ribs, and may be a lattice made of three or more parallel ribs. The size of the base 13A is larger than the size of the base 13 of the first embodiment due to the absence of the plate 20, but compared to the size of the plate 20, the base 13A can be made smaller in some cases.

The base 13A of this embodiment is directly bonded to the concrete floor 1 with a first adhesive 21. The stress distribution generated on the adhesive surface can be dispersed by the reinforcing member (rib 13R).

Therefore, it is preferable that the stress distribution in the plate cross-sectional direction applied between the concrete floor 1 and the plate 20 satisfies the following conditions. FIG. 14 shows the stress distribution in the plate cross-sectional direction along the line F13A-F13A in FIG. FIG. The upper part of FIG. 14 schematically shows the stress on the base 13A (thick arrow) when tensile force is applied to the support shaft 12, and the lower part schematically shows the stress distribution (thin arrow) generated on the adhesive surface. . FIG. 14 is an alternative to FIG. 5(a) described above.

As shown in the upper part of FIG. 14, the tensile stress applied to the base 13A is dispersed over the entire surface of the base 13A due to the increased out-of-plane rigidity of the base 13A due to the ribs 13R. Further, since the out-of-plane rigidity of the base 13A is increased, the amount of deformation of the base 13A due to the tensile force applied to the support member 10 is also small. As shown in the lower part of FIG. 14, the rate of change in the stress distribution in the cross-sectional direction of the plate is smaller at the center than at both ends of the plate cross-section. Thereby, it is possible to distribute the stress over the entire surface of the base 13A to make the stress distribution uniform, so that there is no part where the adhesive strength of the first adhesive 21 exceeds the limit value AFL.

In the case of this embodiment as well, FIG. 5(b) may be used as a comparative example. It is preferable to determine the combination of the base 13A and the first adhesive so that the stress distribution is as shown in FIG. 14 above.

As described above, the fixed structure FS of this embodiment is provided with a support member 10 that supports the installation object 2 with respect to the concrete floor 1, and a support member 10 that is provided between the support member 10 and the concrete floor 1. It has a first adhesive 21 for fixing to the floor 1 and a stress dispersion section for dispersing the tensile force applied to the support member 10 to the surface facing the concrete floor 1.

Note that the rib 13R (rib portion) provided on the upper surface of the base 13A and dispersing the stress generated on the adhesive surface due to the tensile force applied to the base 13A facing the concrete floor 1 is an example of a stress distribution portion.

According to such a configuration, by selecting an adhesive that can secure the necessary adhesive strength to the concrete floor 1 as the first adhesive 21, the base 13A and the concrete floor 1 can be fixed with the desired fixing strength. As in the first embodiment, the concrete floor 1 is not affected.

FS... Fixed structure, 1... Concrete floor, 2... Installation object, 10... Support member, 11... Support member body, 12... Support shaft, 13, 13A, 13x, 13Z... Base, 13R... Rib, 20, 20A, 20x , 20Z...Plate, 21...First adhesive (adhesive), 22...Second adhesive (adhesive), 42...Joining part

Claims (6)

When fixing installed objects to a concrete floor surface with adhesive without using post-installation anchors, it reduces interference with buried objects buried in the concrete floor surface and prevents the adhesive from peeling off. A fixing structure for fixing an installed item to the floor surface while ensuring fixing strength ,
a support member that supports the installed object;
a stress dispersion section that has an upper surface and a lower surface that is used as an adhesive surface that faces the floor surface, and is disposed between the support member and the floor surface ;
an adhesive provided between the support member and the floor surface for adhering the adhesive surface to the floor surface and fixing the support member to the floor surface;
a coupling part for fixing the support member to the stress distribution part;
The support member and the stress distribution section are partially coupled by the coupling section provided at a specific position,
The bonding portion is arranged so as to disperse stress generated on the bonding surface and uniformize the stress distribution generated on the bonding surface,
The stress generated on the adhesive surface due to the tensile force applied to the support member by the joint is dispersed, and the value of the stress distribution generated on the adhesive surface becomes smaller than the limit value of the concrete strength of the floor surface.
Fixed structure. The coupling part is
including a fastening bolt fastened to a plurality of screw holes provided in the stress distribution part,
In the stress distribution section, the value of the stress distribution generated on the adhesive surface by the fastening bolt fixing the supporting member to the stress distribution section is set to be higher than the limit value of the concrete strength of the floor surface. The fixing structure according to claim 1, wherein the screw hole is arranged so that the screw hole is also small. The fixing structure according to claim 1, wherein the rate of change in the stress distribution in the direction along the adhesive surface is smaller at the center than at both ends of the adhesive surface. . The stress distribution part is
a plate disposed between the support member and the floor surface, having a thickness greater than or equal to the thickness of the support member, and comprising the adhesive surface;
Equipped with
The coupling part is
fixing the support member to the plate;
The fixing structure according to any one of claims 1 to 3 . The coupling part is
fixing the support member to the plate in a coupled state;
The fixing structure according to claim 4 , wherein when the bonded state is released, the support member can be removed from the plate while leaving the plate on the floor surface. The support member is
The fixing structure according to any one of claims 1 to 5 , wherein the adhesive becomes plastic before the stress distribution value generated on the adhesive surface exceeds a limit value of the adhesive strength of the adhesive.

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