JP5133183B2 - Free access floor mount - Google Patents

Description

  The present invention is used for a free access floor and can be installed with equipment or the like on the upper part, suppresses amplification of vibration from the floor part, and does not transmit amplified vibration to equipment installed on the upper part. The present invention relates to a rigid free access floor mount.

  Conventionally, the floor panel which comprises a free access floor is arrange | positioned on a support body, and space is formed under a floor panel. The underfloor is used for arranging wiring and flowing air, and a light floor panel is used in consideration of workability and the like.

  However, when installing heavy objects such as equipment on the free access floor, a certain degree of strength is required for the floor panel and the support. In particular, manufacturing equipment such as a semiconductor substrate is vulnerable to vibration, and if the rigidity of the floor panel and the support is insufficient, the support or the like amplifies the vibration of the floor surface and transmits large vibration to the equipment.

  For this reason, when installing facilities that are heavy objects that do not like vibration, such as semiconductor substrate manufacturing equipment, on the free access floor, concrete is placed in advance at the installation location of the equipment, or an equipment installation section is provided, or a solid It is necessary to reinforce the steel structure. However, it is difficult to place and weld concrete in a clean room, and it is difficult to relocate or add equipment by changing the layout.

  As a floor panel in consideration of such strength, there is a panel for a free access floor provided on the back of a continuous concavo-convex shape (Patent Document 1).

In addition, there is a free access floor in which border panel support legs and support beams are provided in the vicinity of the wall surface to increase the installation strength in the vicinity of the wall surface (Patent Document 2).
Japanese Patent Laid-Open No. 11-6276 JP-A-5-118120

  However, in the panel for the free access floor described in Patent Document 1, there is a limit to improving the strength of the panel itself, and it is necessary to improve the strength of the support that supports the panel. Is not taken into consideration, so there is a problem that there is a limit to the installation of heavy objects on the panel.

  In addition, the free access floor described in Patent Document 2 is an improvement in the strength of the support in the vicinity of the wall surface. For the method of improving the strength of the support in the center of the room, the lower part of the support is fixed. Only the effect of improving the bonding area between the plate and the floor is described, there is no description of a specific support structure for supporting a heavy object from the top and having high rigidity, and Patent Document 1 Similarly, there is a problem that there is a limit in installing heavy objects on the panel.

  For this reason, it is difficult for the panel and support described in Patent Document 1 and Patent Document 2 to secure sufficient strength for installing the equipment, and to amplify vibration from the floor surface. There is a problem that it is difficult to ensure such a high rigidity.

  The present invention has been made in view of such problems, and it is possible to install heavy equipment on the top without amplifying vibration from the floor, and a free access floor that is easy to install and construct. The purpose is to provide a platform.

  In order to achieve the above-described object, the present invention includes a lower plate, a first support provided on the lower plate, a lower frame joined to the lower plate via the first support, A second support provided on the lower frame, an upper frame joined to the lower frame via the second support, and an upper plate joined to the upper frame, The lower frame includes a joint portion joined to the first support column and the second support column, and a connection portion that connects the joint portions, and the joint portion has higher rigidity than the connection portion. This is a free access floor mount.

  Preferably, the lower frame has a substantially rectangular shape, and the joints are provided in the vicinity of the four corners of the lower frame.

  A reinforcing member may be provided at the joint. The cross-sectional area of the joint is preferably larger than the cross-sectional area of the connecting part.

  According to the present invention, since the joint portion is provided at a portion to be joined to the lower plate and the upper plate of the lower frame, and the rigidity of the joint portion is larger than the rigidity of the connection portion that connects the joint portions, the rigidity is further increased. The rigidity of only the required portion can be increased, and the rigidity of the connecting portion that does not require rigidity can be decreased.

  For example, if the thickness or width of the joint portion is larger than the thickness or width of the connecting portion (that is, if the cross-sectional area of the joint portion is larger than the cross-sectional area of the connecting portion), the rigidity of only a necessary portion is increased. be able to. In order to improve the cross-sectional area of the joint portion, for example, a reinforcing member may be joined on the lower frame, and the rigidity can be easily increased.

  In particular, by providing the joints at the four corners of the lower frame, the rigidity of the joints can be increased.

  According to the present invention, amplification of vibration from the floor portion is suppressed, and high rigidity (high rigidity against horizontal vibration in particular) that does not transmit the amplified vibration to the equipment installed in the upper part is provided. Therefore, it is possible to provide a free-access floor pedestal that has a weight at the top and that can be installed with equipment that dislikes vibration and that is easy to install and construct.

  Hereinafter, the gantry 1 according to the embodiment of the present invention will be described. FIG. 1 is an exploded perspective view showing a gantry 1 according to the first embodiment, FIG. 2 is an assembled perspective view of the gantry 1, and FIG. 3 is a front view of the gantry 1.

  The gantry 1 mainly includes a lower plate 4, a lower frame 23, a support column 13, a support column 39, an upper frame 49, an upper plate 65, and the like. The lower plate 4 is a part bonded to the floor when the gantry 1 is installed on the floor.

  The lower plate 4 is a plate member made of steel, for example, and is provided with notches 7 at portions corresponding to the four corners of the gantry 1. The notch portion 7 is for preventing interference with a support member for installing a floor panel for free access when the mount 1 is installed. That is, the gantry 1 can be installed without interfering with the legs of the existing support.

  A nut 11 is joined to the lower plate 4. The nut 11 is joined to the lower plate 4 by welding, for example. The nut 11 is a joint portion of the support column 13.

  A plurality of support columns 13 are provided on the lower plate 4 in a substantially vertical direction. The support column 13 is a steel rod-like member, and is provided with bolt portions 17a and 17b at both ends. The support column 13 is fixed to the nut 11 by screwing. A total of eight struts 13 are provided in the vicinity of each side of the lower plate 4 so as to receive the force from above evenly.

  In addition, the number and the installation position of the support | pillar 13 should just be able to perform joining with the lower frame 23 mentioned later reliably, and are not restricted to the form of the mount frame 1 mentioned above. However, in order to obtain high rigidity with certainty, it is desirable that when the gantry 1 is viewed from above, the arrangement of the columns 13 is symmetrical with respect to the center of the gantry 1 because the load balance is excellent.

  A lower frame 23 is provided above the column 13. The four corners of the lower frame 23 are cut obliquely to prevent interference with an existing support or the like. The lower frame 23 is a substantially rectangular member made of steel, and has a connecting portion 25 and a connecting portion 26. The connection portion 25 is a connection portion between the support column 13 and a support column 39 which will be described later, and is arranged at four locations near the four corners of the lower frame 23. The connecting part 26 is a part that connects the connecting parts 25 together. The connecting portion 25 is wider than the connecting portion 26. That is, the connecting portion 25 has a larger cross-sectional area than the connecting portion 26.

  In addition, the rigidity of the connection part 25 should just be higher than the connection part 26, and in order to make the cross-sectional area of the connection part 25 larger than the cross-sectional area of the connection part 26, you may change thickness instead of width. Further, the rigidity of the connecting portion 25 and the connecting portion 26 may be changed by changing the material. Further, the connecting portion 25 and the connecting portion 26 may be formed integrally, or may be joined by a known method after being formed separately. In addition, when making thickness of the junction part 25 thicker than the connection part 26, you may thicken thickness by attaching a reinforcement member to a junction part separately.

  The connecting portion 25 is provided with a hole 27 and a hole 29. The hole 27 is a connection portion with the support column 13. Moreover, the hole 29 is a joint part with the support | pillar 39 mentioned later, and the internal thread process is given inside. That is, the hole 27 is provided at the installation position of the support column 13 when the lower frame 23 is installed on the lower plate 4.

  The bolt portion 17b above the column 13 passes through the hole 27 of the lower frame 23 and is fixed by nuts 31a and 31b. That is, the nuts 31 a and 31 b are provided so as to sandwich the lower frame 23 from both sides in the vertical direction, and the support column 13 is fixed to the lower frame 23. That is, the lower plate 4 and the lower frame 23 are joined via the support column 13.

  A support post 39 is provided on the lower frame 23. The support posts 39 are slightly thicker (higher rigidity) than the support posts 13, and four support posts 39 are provided near the four corners of the lower frame 23. The support column 39 is a steel member, and bolts 43a and 43b are provided at both ends. The bolt portion 43a below the support post 39 passes through the hole 29 of the lower frame 23 and is fixed by nuts 37a and 37b. That is, the nuts 37 a and 37 b are provided so as to sandwich the lower frame 23 from both sides in the vertical direction, and the support column 39 is fixed to the lower frame 23.

  In addition, the number and the installation position of the support | pillar 39 should just be able to perform joining with the upper frame 49 mentioned later reliably, and are not restricted to the form of the mount frame 1 mentioned above. However, in order to reliably obtain high rigidity, it is desirable that when the gantry 1 is viewed from above, the arrangement of the columns 39 is symmetrical with respect to the center of the gantry 1 because the load balance is excellent. In particular, it is desirable to increase the rigidity so that the struts 39 are separated from each other so that the struts 39 are close to the four corners of the lower frame 23.

  An upper frame 49 is provided above the column 39. The upper frame 49 is a rectangular plate-shaped member made of steel. The upper frame 49 is provided with a hole 51 and a hole 55. The hole 51 is a joint portion with the bolt portion 43 b of the support column 39. The bolt part 43b of the support post 39 passes through the hole 51 and is fixed by the nuts 37c and 37d. That is, the nuts 37 c and 37 d are provided so as to sandwich the upper frame 49 from the vertical direction, and the upper frame 49 is fixed to the support column 39. For this reason, there is no slip or shift at the joint between the support column 39 and the upper frame 49. The hole 55 is subjected to female threading.

  The four corners of the upper frame 49 are cut obliquely. This is to prevent interference with an existing support that supports the floor panel. That is, the gantry 1 can be installed without interfering with the support or the like even at a site where the existing support or the like is installed.

  An upper plate 65 is provided on the upper frame 49. The upper plate 65 is a rectangular plate-shaped member made of steel, and is a part where equipment and the like are installed in the upper part. A connection member 61 is provided on the upper plate 65. The connecting member 61 is a hollow columnar member having a hole in the center, and is a member that connects the upper frame 49 and the upper plate 65. The connecting member 61 may be previously joined to the upper plate 65 by welding or the like, or may be a separate member.

  The installation position of the connection member 61 is a position corresponding to the hole 55 of the upper frame 49. A hole 71 is provided at the installation position of the connecting member 61 of the upper plate 65. The bolt 69 passes through the hole 71 and the hollow portion of the connecting member 61, and is screwed into the hole 55 of the upper frame 49 to be fixed. Although not shown, the hole 71 of the upper plate 65 has a stepped shape so that the head of the bolt 69 can be accommodated. When the upper plate 65 and the upper frame 49 are fixed with the bolt 69, the bolt 71 69 does not protrude on the surface of the upper plate 65.

  Next, the installation state of the gantry 1 will be described. FIG. 4 is a plan view showing a state where the gantry 1 is installed at a position corresponding to the facility installation site 75 on the floor on which a plurality of floor panels 73 are arranged. The upper surface of the gantry 1 is the same size as the floor panel 73. That is, the upper plate 65 is the same size as the floor panel 73.

  When the installation site 75 is determined on the free access floor, the floor panel 73 corresponding to the installation site 75 is removed, and the gantry 1 is installed instead. Depending on the size of the equipment installed on the upper part, the gantry 1 may be used alone or may be two vertically and horizontally as shown in FIG. What is necessary is just to determine the installation number of the mounts 1 according to the magnitude | size of an installation and the installation installation site | part 75, and just to replace with the floor panel 73 of the installation site | part 1 installation site.

  A support body is usually installed at a confluence portion of each corner of the floor panel 73, and the floor panel 73 is disposed on the support body. Since the gantry 1 has notches at the four corners of the lower plate 4, it does not interfere with the legs of the existing support. Further, the four corners of the lower frame 23 and the upper frame 49 are also cut obliquely and provided with cutout portions, so that they do not interfere with the support. For this reason, the gantry 1 can be installed in a state where the support is installed.

  Thus, according to the gantry 1 according to the present embodiment, since it has high rigidity (particularly horizontal rigidity), it does not amplify vibration from the floor. Even if a weak facility is installed, vibration from the floor is not amplified and transmitted.

  In addition, the lower frame 23 has a connecting portion 25 and a connecting portion 26, and only the portion to which the support columns 13 and 39 are connected has a large rigidity, and the width of the connecting portion 26 that does not require rigidity is reduced to reduce the rigidity. Light weight and high rigidity can be obtained. Further, since the lower frame 23 has a thickness that allows the support post 39 to be screwed and has a hole 29 that has been subjected to female thread processing, a nut is not required, and the assembly workability is excellent.

  Further, since the four corners of the lower plate 4 are notched, the base plate 1 is installed in place of the existing floor panel 73 when the equipment is relocated or expanded without interfering with the legs of the existing support or the like. It is possible. In particular, since the gantry 1 is easy to assemble and disassemble each member, it can be easily installed on-site without performing welding work in a clean room or requiring special cranes or other equipment. Can be performed.

  Further, since the columns 13 and 39 receive a load from above, a frame having a desired strength can be obtained by appropriately changing the number of columns 13 and 39, and a frame capable of installing heavy equipment. Can be provided.

  Next, the gantry 80 according to the second embodiment will be described. 5 to 7 are views showing the gantry 80, FIG. 5 is an exploded perspective view of the gantry 80, FIG. 6 is an assembled perspective view of the gantry 80, and FIG. 7 is a front view of the gantry 80. In the gantry 80, the same reference numerals as those in FIGS. 1 to 3 are assigned to the constituent elements having the same functions as those of the gantry 1 shown in FIGS. The gantry 80 mainly includes the lower plate 3, the lower frame 23, the support column 15, the support column 41, the upper frame 45, the upper plate 63, the turn buckle 19, and the like.

  The lower plate 3 is a part bonded to the floor when the gantry 80 is installed on the floor. The lower plate 3 is a steel plate-like member, and the notch portions 7 are provided at corresponding portions of the four corners of the gantry 80. The notch portion 7 is for preventing interference with a support member for installing a floor panel for free access when the mount 80 is installed. That is, the gantry 80 can be installed without interfering with the legs of the existing support.

  A reinforcing member 5 is provided on the lower plate 3. The reinforcing member 5 is a steel plate-like member, for example, and is thicker than the lower plate 3. The reinforcing member 5 is a joint portion with a support column 15 described later, and is provided between the cutout portions 7. The reinforcing member 5 and the lower plate 3 may be joined by welding or other methods, and even when the reinforcing member 5 and the lower plate 3 are manufactured integrally in advance, the portion is referred to as a reinforcing member. The reinforcing member 5 is provided with a plurality of holes 9. The hole 9 is provided with a female screw. In addition, since the hole 9 does not penetrate to the lower plate 3, the adhesive or the like does not enter from the lower plate 3 to the upper side of the lower plate 3 or the hole 9 of the reinforcing member 5.

  A plurality of support columns 15 are provided on the lower plate 3 in a substantially vertical direction. The support column 15 is a steel rod-shaped member having a hexagonal cross section, and bolts 17a and 17b having a diameter smaller than that of the hexagonal cross section are provided at both ends. The support column 15 is screwed into the hole 9 of the reinforcing member 5. A total of eight struts 15 are provided in the vicinity of each side of the lower plate 3 so as to receive the force from above evenly.

  In addition, the number and the installation position of the support | pillar 15 should just be able to perform joining with the lower frame 23 mentioned later reliably, and are not restricted to the form of the mount frame 80 mentioned above. However, in order to reliably obtain high rigidity, it is desirable that when the gantry 80 is viewed from above, the arrangement of the columns 15 is symmetrical with respect to the center of the gantry 80 because the load balance is excellent.

  The lower plate 3 is provided with a plurality of holes 8 that are internally threaded. Four holes 8 are provided at regular intervals on a concentric circle with the center of the lower plate 3 as a reference. FIG. 8 is an enlarged cross-sectional view of the lower plate 3 in the vicinity of the hole 8. The lower plate 3 and the floor 58 are bonded by an adhesive 77. A plate 79 is provided as a backing plate between the lower plate 3 below the hole 8 and the floor 58. Bolts 76 are provided in the holes 8 provided in the lower plate 3.

  When the bolt 76 is rotated, the tip of the bolt 76 hits the plate 79, and the gap between the lower plate 3 and the floor 58 (plate 79) changes. The level of the lower plate 3 can be adjusted by adjusting the height of each bolt 76 for each hole 8 provided in the lower plate 3. That is, the horizontal level of the gantry 80 can be adjusted by the hole 8 and the bolt 76 that are the horizontal adjustment mechanism.

  A lower frame 23 is provided above the support 15. The four corners of the lower frame 23 are cut obliquely to prevent interference with an existing support or the like. The lower frame 23 is a substantially rectangular member made of steel, and has a connecting portion 25 and a connecting portion 26. The connection portions 25 are connection portions between the support column 15 and a support column 41 described later, and are arranged at four locations near the four corners of the lower frame 23. The connecting part 26 is a part that connects the connecting parts 25 together. The connecting portion 25 is wider than the connecting portion 26. That is, the connecting portion 25 has a larger cross-sectional area than the connecting portion 26.

  In addition, the rigidity of the connection part 25 should just be higher than the connection part 26, and in order to make the cross-sectional area of the connection part 25 larger than the cross-sectional area of the connection part 26, you may change thickness instead of width. Further, the rigidity of the connecting portion 25 and the connecting portion 26 may be changed by changing the material. Further, the connecting portion 25 and the connecting portion 26 may be formed integrally, or may be joined by a known method after being formed separately. In addition, when making thickness of the junction part 25 thicker than the connection part 26, you may thicken thickness by attaching a reinforcement member to a junction part separately.

  The connecting portion 25 is provided with a hole 27 and a hole 29. The hole 27 is a connection portion with the support column 15. Moreover, the hole 29 is a junction part with the support | pillar 41 mentioned later, and the internal thread process is given inside. That is, the hole 27 is provided at the installation position of the support column 15 when the lower frame 23 is installed on the lower plate 3.

  The bolt portion 17 b above the support column 15 passes through the hole 27 of the lower frame 23 and is fixed by the nut 31 from above the lower frame 23. That is, the lower plate 3 (reinforcing member 5) and the lower frame 23 are joined via the support column 15.

  A support column 41 is provided on the lower frame 23. The support posts 41 are slightly thicker (higher rigidity) than the support posts 15, and four support posts 41 are provided near the four corners of the lower frame 23. The support column 41 is a steel rod-shaped member having a hexagonal cross section, and bolt portions 43a and 43b having a diameter smaller than that of the hexagonal cross section are provided at both ends. The bolt part 43a below the support column 41 is fixed by screwing into the hole 29 of the lower frame 23 (joining part 25). That is, the support column 41 is fixed to the lower frame 23.

  Note that the cross-sectional shape of the support columns 15 and 41 is not limited to a hexagonal cross-section, and may be a polygonal cross-sectional shape. With the polygonal cross-sectional shape, the support columns 15 and 41 can be rotated without requiring a special tool, and the work is easy when screwing into the holes 9 and 29. Further, it is desirable to increase the surface roughness of the stepped surface between the polygonal cross-sectional shape portion and the bolt portion because the positional accuracy of the contact surface with the frame is improved and the dimensional accuracy is improved.

  In addition, the number and the installation position of the support | pillar 41 should just be able to join with the upper frame 45 mentioned later reliably, and are not restricted to the form of the mount frame 80 mentioned above. However, in order to reliably obtain high rigidity, it is desirable that when the gantry 80 is viewed from above, the arrangement of the columns 41 is symmetrical with respect to the center of the gantry 80 because the load balance is excellent. In particular, it is desirable to increase the rigidity so that the columns 41 are separated from each other so that the columns 41 are close to the four corners of the lower frame 23.

  An upper frame 45 is provided above the support column 41. The upper frame 45 is a substantially rectangular member having a hole in the center made of steel. The upper frame 45 is provided with a connecting hole 47, a hole 51, and a hole 53. The connection hole 47 will be described later. The hole 51 is a joint portion with the bolt portion 43 b of the support column 41. The bolt portion 43 b of the support column 41 passes through the hole 51 and is fixed by the nut 37. That is, the upper frame 45 is fixed to the support column 41.

  The four corners of the upper frame 45 are cut obliquely. This is to prevent interference with an existing support that supports the floor panel. That is, the gantry 80 can be installed without interfering with the support or the like even at a site where the existing support or the like is installed.

  The connection hole 47 can connect the adjacent bases 80 with a connection plate. As described above, the gantry 80 may be provided with a plurality of gantry 80 depending on the size and position of the equipment to be installed in the upper part. In this case, by connecting the gantry 80 adjacent to each other, High rigidity can be obtained.

  FIG. 9 is a diagram illustrating a case where the bases 80 are joined together using the connection holes 47. A connecting plate 81 is provided on the upper frame 45. The connection plate 81 is provided with a hole 83. The connecting hole 47 and the hole 83 of the connecting plate 81 are provided at corresponding positions, and the connecting plate 81 is joined to the upper frame 45 by bolts 85.

  FIG. 9C is an enlarged view of the vicinity of the connection plate 81 of FIG. 9B, and the connection plate extends over the upper frames 45a and 45b of the adjacent bases 80a and 80b (FIG. 9B). 81 is provided, and the connecting plate 81 is joined to the upper frames 45 a and 45 b by bolts 85. That is, the upper frame 45a and the upper frame 45b are joined. Therefore, the adjacent mounts 80a and 80b are connected to each other.

  An upper plate 63 is provided on the upper frame 45. The upper plate 63 is a rectangular member made of aluminum, and is a part where equipment and the like are installed in the upper part. As the upper plate 63, a conventional floor panel can be used, and other materials may be used. An adjustment member 59 is provided between the upper frame 45 and the upper plate 63. The adjustment member 59 is a member that adjusts the height of the upper plate 63. The adjustment member 59 will be described later.

  Cutouts 64 (FIG. 7) are provided on the lower surfaces of the four corners of the upper plate 63. The notch 64 is for preventing interference with an adjacent support member for installing a free access floor panel. That is, the gantry 80 can be installed without interfering with the legs of the existing support.

  The upper frame 45 is provided with a hole 68. The hole 68 is a joint portion with the adjustment member 59. FIG. 10 is a view showing the hole 68 of the upper plate 63. A plurality of ribs 87 are provided on the lower surface of the upper plate 63. The hole 68 is provided at the position of the rib 87. In FIG. 10A, the dotted line position is the processed part of the hole 68.

  FIG. 10B is a view showing a state in which the hole 68 is provided at the position of the rib 87, and FIG. 10C is a cross-sectional view taken along line AA of FIG. The hole 68 has steps 89a and 89b provided therein, and has a shape in which the upper and lower diameters are enlarged. Since the hole 68 is provided at the position of the rib 87, steps 89a and 89b can be provided.

  FIG. 11A is an exploded view, and FIG. 11B is a diagram showing a joined state. The adjustment member 59 includes a protrusion 95 having a hole 97 in which an internal thread is machined, and a bolt portion 93. The bolt portion 91 below the adjustment member 59 is screwed into the hole 53 of the upper frame 45. At this time, the nut 93 is screwed into the bolt portion 91 in advance, and the adjustment member 59 is fixed by the nut 93. The adjusting member 59 is screwed into the hole 53 by an arbitrary screwing allowance, and then fixed at that position by the nut 93. Therefore, the height of the adjustment member 59 can be easily adjusted by the screwing allowance of the bolt portion 91.

  The protrusion 95 is inserted from below the hole 63 of the upper plate 63. Bolts 67 are inserted into the holes 68 from above the upper plate 63 and screwed into the holes 97. The head of the bolt 67 does not protrude on the upper plate 63 due to the step 89 a, and the bolt 67 does not fall down below the hole 68. Therefore, the adjustment member 59 is joined to the upper plate 63 by the bolt 67.

  When adjusting the height of the upper plate 63 from the state in which the adjustment member 59 is joined (FIG. 11B), the bolt 67 is removed, the upper plate 63 is removed, the nut 93 is loosened, and the bolt portion 91 is screwed. What is necessary is just to adjust the surrogate. After adjustment, the nut 93 may be tightened to securely fix the adjustment member 59 to the upper frame 45, and the upper plate 63 may be installed in the same procedure. As described above, the height of the gantry 80 can be adjusted.

  The lower frame 23 and the upper frame 45 are further joined by a turnbuckle 19. The turnbuckle 19 is provided obliquely on a substantially diagonal line of a rectangular portion formed by the lower frame 23, the upper frame 45 and the support column 41. Mounting portions 35a and 35b are provided on the lower frame 23 and the upper frame, respectively. Bolt holes are provided in the attachment portions 35a and 35b in advance, and turnbuckles are joined to the lower frame 23 and the upper frame 45 by bolts.

  The turnbuckle 19 is for suppressing the amplification of horizontal vibration of the gantry 80 and increases the rigidity of the gantry 80. Instead of the turnbuckle 19, another reinforcing member can be provided in an oblique direction between the upper frame 45 and the lower frame 23.

  According to the gantry 80 according to the second embodiment, the same effect as that of the first embodiment can be obtained.

  Further, since the reinforcing member 5 is provided at the joint portion between the lower plate 3 and the support column 15, high rigidity can be obtained at the joint portion with the support column 15. Further, since the hole 9 provided in the reinforcing member 5 does not penetrate the lower plate 3, the adhesive used for bonding the lower plate 3 does not enter the hole 9. Further, if female threading is performed on the hole 9, it is not necessary to weld a nut or the like to the lower plate 3, and joining with the support column 15 is easy.

  Further, the horizontal level of the gantry 80 can be easily adjusted by screwing the bolts 76 into the holes 8 provided in the lower plate 3.

  Further, since the lower frame 23 and the upper frame 45 are not provided with ribs or the like, the manufacture is easy.

  Moreover, since the support | pillars 15 and 41 are polygonal cross-sectional shapes, even if there is no special tool, it can be rotated easily and attachment is easy. Moreover, since the polygonal cross-sectional shape part of the support | pillars 15 and 41 has a diameter larger than a bolt part, high rigidity can be acquired. Moreover, since the support | pillar 41 is provided in the four-corner vicinity of the lower flame | frame 23 and the support | pillars 41 are separated, greater rigidity can be obtained.

  Further, a connection hole 47 is provided on the upper surface of the upper frame 45, and the adjacent bases 80 can be fixed by the connection plate 81. For this reason, higher rigidity can be obtained as a whole of the plurality of fixed bases 80. Further, since the connecting operation can be performed from the upper surface, the connecting operation can be easily performed by removing the upper plate 63.

  Further, since the adjustment member 59 is provided on the upper frame 45, the height of the gantry 80 can be easily adjusted. In particular, the height can be adjusted simply by removing the upper plate 63, and therefore the operation is easy.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

FIG. 3 is an exploded perspective view of the gantry 1. FIG. 3 is an assembled perspective view of the gantry 1. The front view of the mount frame 1. FIG. The figure which shows the state which installed the mount frame 1. FIG. FIG. FIG. The front view of the mount frame 80. FIG. The lower plate 3 cross-sectional enlarged view of the hole 8 vicinity. It is a figure which shows the state which connected bases 80, (a) is a perspective view which shows the state which provided the connection board 81, (b) is a front view which shows the state which connected bases 80a and 80b, (c) is ( The enlarged view which shows the connection board 81 vicinity of b). Sectional drawing which shows the state which provided the hole 68 in the rib 87. FIG. Sectional drawing which shows the attachment state of the adjustment member 59. FIG.

Explanation of symbols

1, 80 ......... Stands 3, 4 ......... Lower plate 5 ......... Reinforcing member 7 ......... Notch 8 ......... Hole 9 ......... Hole 11 ......... Nuts 13, 15 ......... Posts 17a, 17b ............ Bolt portion 19 ......... Turnbuckle 23 ......... Lower frame 25 ......... Connection portion 26 ......... Connection portion 27 ......... Hole 29 ......... Hole 31 ......... Nuts 35a, 35b ......... Mounting part 37 ......... Nuts 39, 41 ......... Posts 43a, 43b ......... Bolt part 45 ...... Upper frame 47 ......... Connection hole 49 ......... Upper frame 51 ......... Hole 53, 55 ......... Hole 58 ......... Floor 59 ......... Adjusting member 61 ......... Connecting members 63, 65 ......... Upper plates 67, 69 ......... Bolts 68, 71 ......... Hole 73 ......... Floor panel 75 ......... Installation location 76 ... ... Bolt 77 ... ... Adhesive 79 ... ... Plate 81 ... ... Forming plate 83 ......... hole 85 ......... bolt 87 ......... ribs 89a, 89b ......... step 91 ......... bolt portion 93 ......... nut 95 ......... projections 97 ......... hole

Claims (4)

A lower plate,
A first support provided on the lower plate;
A lower frame joined to the lower plate via the first support column;
A second support provided on the lower frame;
An upper frame joined to the lower frame via the second column;
An upper plate joined on the upper frame;
Comprising
The lower frame includes a joint portion joined to the first support column and the second support column, and a connection portion that connects the joint portions, and the joint portion has higher rigidity than the connection portion. Free access floor mount.   The base for a free access floor according to claim 1, wherein the lower frame has a substantially rectangular shape, and the joint portions are provided in the vicinity of four corners of the lower frame.   The base for a free access floor according to claim 1, wherein a reinforcing member is provided in the joint portion.   The free access floor pedestal according to any one of claims 1 to 3, wherein a cross-sectional area of the joint portion is larger than a cross-sectional area of the connecting portion.

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