JP5752394B2 - Isolation method for seismic isolation floor - Google Patents

Description

  The present invention relates to an isolator construction method for a base isolation floor that absorbs the vertical motion of a base isolation floor such as a computer room.

  A base isolation structure using an isolator has been proposed so that the computer in the computer room is not affected by vibrations caused by earthquakes or the like (Patent Documents 1 to 3).

  In this seismic isolation structure, as shown in FIG. 6, an isolator 41 made up of a number of air springs and a vertical guide 42 as a damper are arranged on a concrete floor 40. The gantry 43 is supported by being separated from each other, and a floor 44 is formed on the gantry 43. A large number of computers 45 are installed on the floor 44 so as to be protected from vibration during an earthquake. In this seismic isolation structure, a predetermined air pressure is applied to the isolator 41, and the vertical movement of the floor 44 supported on the gantry 43 by the damper action of the vertical guide 42 and the air spring action of the isolator 41 in the event of an earthquake. To absorb.

  Conventionally, when the isolator 41 is installed on the concrete floor 40, as shown in FIG. 5, anchor bolts 47 are placed at four corners on the concrete floor 40 on which the isolator 41 is installed, and the periphery of the anchor bolt 47 is placed. After covering with a formwork (not shown) and filling the mortar, the base mortar 48 is placed, and after the base mortar 48 is hardened, the isolator 41 is installed on the base mortar 48 with the anchor bolt 47, and then on the isolator 41 The pedestal 43 is installed on the floor 43, and can be moved up and down with bolts and nuts 49 while preventing lateral displacement of the pedestal 43, and the floor 44 is laid on the support member 50.

JP 2010-133158 A JP 2009-287273 A JP 05-248493 A

  By the way, when constructing a new seismic isolation structure for a computer room, there is no problem even if the isolator 41 is installed after the base mortar 48 is cured and cured. However, there is a problem that the isolator 41 cannot be easily removed when a new isolator 41 is replaced due to a failure or malfunction of the isolator 41. That is, the isolator 41 is fixed to the anchor bolt 47 with a nut, and even if the nut is removed, the anchor bolt 47 still protrudes on the basic mortar 48, and a gap between the isolator 41 and the mount 43 cannot be secured. Therefore, the isolator 41 cannot be lifted upward and removed. For this reason, in order to replace the isolator 41, there is a problem that the replacement can only be performed by removing the basic mortar 48 together. In addition, when the basic mortar 48 is beaten by exchanging the isolator 41, dust is scattered in the computer room and the isolator 41 cannot be installed until the basic mortar 48 is cured.

  Then, the objective of this invention is providing the isolator construction method of the seismic isolation floor which can solve the said subject, can remove an isolator easily, and can install an isolator, without waiting for curing of a foundation mortar.

In order to achieve the above object, according to the first aspect of the present invention, an anchor bolt is placed on a concrete floor, a foundation mortar is constructed on the concrete floor on which the anchor bolt is placed, and an isolator is installed on the foundation mortar. In the isolator construction method of the base isolation floor where the isolator is fixed with anchor bolts on the foundation mortar, and the base that supports the floor with the isolator is isolated , the male screw bolt to be screwed into the female screw cylinder and the female screw cylinder on the concrete floor The female mortar anchor bolt was placed, the female screw cylinder and male screw bolt after the placement were covered with a protective tube to construct a basic mortar, and then the isolator was held by the female thread anchor bolt. This is an isolator construction method for a seismically isolated floor.

  In the invention of claim 2, the female thread type anchor bolt comprises a female thread cylinder having a slit formed at the lower end and a male thread bolt screwed into the female thread cylinder. Screw the male screw bolt into the female screw cylinder, then insert the protective tube into the female screw cylinder protruding from the concrete floor, and screw the lower nut supporting the base plate of the isolator into the male screw bolt, and build the basic mortar in that state It is the isolator construction method of the seismic isolation floor of Claim 1.

  The invention according to claim 3 is the isolator construction method for a seismic isolation floor according to claim 2, wherein the foundation mortar is constructed by installing a mold on a concrete floor and filling the mold with the mortar.

  In the invention of claim 4, after filling the basic mortar, the mounting hole of the base plate of the isolator is fitted into the male screw bolt of the female screw type anchor bolt, and the isolator is supported on the lower nut screwed into the male screw bolt. 4. The seismic isolation floor isolator construction method according to claim 3, wherein the upper nut is screwed into the male screw bolt to hold the isolator, and the basic mortar is cured in that state.

  According to the invention of claim 5, after filling or before filling the mortar, a base mortar is constructed by providing a joint rod along one side of the base plate of the isolator, and the joint rod is removed to form a groove for removing the isolator. Item 4. An isolator construction method for a seismic isolation floor according to Item 4.

  In the invention of claim 6, when replacing the isolator, the upper nut is removed from the male screw bolt, then the male screw bolt is removed from the female screw cylinder, and then the isolator is pulled out horizontally from the gantry and then pulled out on the basic mortar. 5. After that, a new isolator is inserted on the foundation mortar and between the mounts, and then a male screw bolt is screwed into the female screw cylinder, and an upper nut is screwed into the male screw bolt to fix the new isolator. Or it is the isolator construction method of the seismic isolation floor of 5.

  According to the present invention, a male threaded anchor bolt can be easily removed from a female threaded cylinder by placing a female threaded anchor bolt on a concrete floor and constructing a foundation mortar by covering the periphery of the anchor bolt with a protective tube. This makes it possible to exhibit an excellent effect that the isolator can be pulled out and exchanged even if the space between the foundation mortar and the gantry is small.

It is sectional drawing of the base isolation structure installed with the isolator construction method of the base isolation floor of this invention. It is detail drawing of the internal thread type anchor bolt in this invention. In this invention, it is a figure which shows the construction procedure which drives a female thread type anchor bolt in a concrete floor. In this invention, it is a figure which shows the construction procedure which installs an isolator after constructing a foundation mortar in a concrete floor. It is sectional drawing of the seismic isolation structure installed with the isolator construction method of the conventional seismic isolation floor. It is a schematic whole perspective view which shows a seismic isolation floor structure.

  A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 shows a seismic isolation structure installed by an isolator construction method for a seismic isolation floor according to the present invention. An internal thread type anchor bolt 11 is placed on a concrete floor 10, and a foundation mortar 12 is placed on the concrete floor 10. The isolator 13 is installed on the foundation mortar 12, the gantry 14 is installed on the isolator 13, and the bolts and nuts 15 provided on the isolator 13 are inserted into the gantry 14 to prevent lateral displacement, and the gantry 14 The floor 17 is held on the support member 16 above.

  The isolator 13 is connected to an auxiliary tank 19 through a flexible pipe 18 and absorbs vertical vibrations of the floor 17 during an earthquake by the air spring action of the isolator 13.

  FIG. 2 shows details of the female thread type anchor bolt 11 used in the present invention, which basically comprises a female thread cylinder 20 and a male thread bolt 21, and a lower nut 22 is screwed into the male thread bolt 21. Further, the upper nut 23 is screwed, and the upper and lower nuts 22 and 23 support the base plate 13B of the isolator 13.

  The female screw cylinder 20 is formed in a cylindrical shape, a female screw 25 that is screwed into the male screw bolt 21 is formed inside, a cylindrical portion 26 at the lower end is formed in a bamboo shoot shape, and a slit 27 is formed in the axial direction. A diameter-expanding taper pin 28 is fitted into the cylindrical portion 26, and the cylindrical portion 26 at the lower end can be expanded by driving the female screw cylinder 20 with a driving machine.

  Next, the isolator construction method for the seismic isolation floor of the present invention will be described with reference to FIGS.

  First, as shown in FIG. 3A, a pilot hole 30 into which the female screw anchor bolt 11 can be inserted is drilled in the concrete floor 10 where the isolator 13 is installed.

  Next, as shown in FIG. 3B, the female screw cylinder 20 of the female screw anchor bolt 11 is inserted into the pilot hole 30, and the female screw cylinder 20 is inserted into the pilot hole 30 by a driving machine (not shown). As shown in FIG. 3 (c), the cylindrical portion 26 at the lower end is expanded in diameter so that the inner wall of the prepared hole 30 is not easily inserted.

  Thereafter, as shown in FIG. 3 (d), the male screw bolt 21 is screwed into the female screw cylinder 20, and the female screw anchor bolt 11 is driven into the concrete floor 10.

  Next, as shown in FIG. 3 (e), a protective tube 31 is fitted on the outer periphery of the female thread type anchor bolt 11. The protective tube 31 is made of a flexible and stretchable bellows-like synthetic resin tube such as a drain hose for an air conditioner, and has an inner diameter larger by 1 to 3 mm than the female screw cylinder 20.

  After fitting the protective tube 31, the lower nut 22 is screwed into the male screw bolt 21, and the template 32 is further attached, and the template 32 is temporarily fixed with the upper nut 23, and the template 32 is fixed with the lower nut 22 and the upper nut 23. The mounting height of the isolator 13 to be installed is adjusted by checking the level and its height.

  After the height adjustment of each lower nut 22 by the template 32 is completed, a mold 33 for placing the foundation mortar 12 is installed, and the upper nut 23 and the template 32 are removed.

  After the female screw type anchor bolt 11 is driven in this way and the lower nut 22 is adjusted in position and attached, as shown in FIG. 4 (a), the mold 33 is filled with mortar and the basic mortar 12 is attached. To construct.

  Next, as shown in FIG. 4B, before the base mortar 12 is hardened, the mounting hole 34 of the base plate 13B of the isolator 13 is fitted into the male screw bolt 21 of the female screw anchor bolt 11, and FIG. As shown, the isolator 13 is attached by screwing the upper nut 23.

  In this case, the isolator 13 is supported by the lower nut 22 screwed into the female thread type anchor bolt 11, and since the load is not applied to the basic mortar 12, it can be installed before the basic mortar 12 is hardened. Efficiency is improved.

  Further, when the mold 33 is filled with the mortar after the isolator 13 is supported by the female threaded anchor bolt 11, air enters between the filled mortar and the base plate 13B, and a nest is formed between the base plate 13B and the basic mortar 12 after curing. Although it occurs, by installing the isolator 13 after the mortar filling and before the basic mortar 12 is cured, the air between them is discharged and the adhesion between the basic mortar 12 and the base plate 13B is improved.

  A joint rod 35 is provided on one side of the base plate 13B before the base mortar 12 is hardened or filled with the mortar. After the foundation mortar 12 is cured, the joint rod 35 is removed to form a groove 36 for isolator removal. .

  After the isolator 13 is installed, the gantry 14 and the floor 17 are constructed as described with reference to FIG. In this case, since the gantry 14 and the like can be constructed without waiting for the curing of the basic mortar 12, the construction period can be shortened.

  Next, a construction method in which the isolator 13 is deteriorated due to aging and the isolator 13 is detached and a new isolator 13 is attached will be described.

  In this case, a gap is formed between the gantry 14 and the upper plate 13 </ b> U of the isolator 13 by holding the gantry 14 with a jack (not shown) and removing the air from the isolator 13.

  In this state, the upper nut 23 is removed, and the male screw bolt 21 is further removed from the female screw cylinder 20. At this time, the female screw cylinder 20 and the male screw bolt 21 are separated from the basic mortar 12 by the protective tube 31, and the male screw bolt 21 can be easily and easily removed. When the male screw bolt 21 is removed in this manner, the base plate 13B is placed on the basic mortar 12 and the lower nut 22, and the isolator 13 can be pulled out in the lateral direction. At this time, since the base plate 13B is in close contact with the basic mortar 12, it can be easily separated from the basic mortar 12 by inserting a bar into the lower surface of the base plate 13B using a groove 36 formed in the basic mortar 12 and pushing it up. it can.

  Thereafter, a new isolator 13 is inserted between the basic mortar 12 and the gantry 14 and aligned.

  Next, the new isolator 13 can be installed by screwing a new male screw bolt 21 into the female screw cylinder 20 and screwing the upper nut 23 into the male screw bolt 21. After the installation, the isolator 13 and the auxiliary tank 19 are connected by a flexible pipe 18, and a predetermined air pressure is applied to the isolator 13 to support the gantry 14 and the jack is removed.

  Thus, the replacement of the isolator 13 does not require the work of dripping the concrete as in the prior art, and can be easily replaced simply by removing the upper nut 23 and the male screw bolt 21. Since it is short and not affected by dust, it can be easily replaced while the computer is running.

DESCRIPTION OF SYMBOLS 10 Concrete floor 11 Female thread type anchor bolt 12 Foundation mortar 13 Isolator 14 Mounting frame 17 Floor 31 Protection tube

Claims (6)

An anchor bolt is placed on the concrete floor, a foundation mortar is constructed on the concrete floor on which the anchor bolt is placed, an isolator is installed on the foundation mortar, and the isolator is fixed with the anchor bolt on the foundation mortar. In the isolator construction method of the seismic isolation floor that supports the base that supports the floor at the base , a female thread anchor bolt consisting of a female thread cylinder and a male thread bolt that is screwed into the female thread cylinder is placed on the concrete floor. An isolator construction method for a seismic isolation floor, wherein a base mortar is constructed by covering a rear female screw cylinder and a male screw bolt with a protective tube, and then holding the isolator with a female screw anchor bolt.   The female threaded anchor bolt is composed of a female threaded cylinder with a slit formed at the lower end and a male threaded bolt that is screwed into the female threaded cylinder. After the female threaded cylinder is placed on the concrete floor, the male threaded bolt is attached to the female threaded cylinder. The base isolation mortar according to claim 1, wherein the base mortar is constructed by screwing and inserting a protective tube into the female screw cylinder protruding from the concrete floor, and screwing the lower nut supporting the base plate of the isolator into the male screw bolt. Floor isolator construction method.   The base mortar is an isolator construction method for a seismic isolation floor according to claim 2, wherein the base mortar is constructed by installing a formwork on a concrete floor and filling the formwork with the mortar.   After filling the basic mortar, fit the mounting hole of the base plate of the isolator into the male screw bolt of the female screw type anchor bolt and support the isolator on the lower nut screwed into the male screw bolt, and screw the upper nut into the male screw bolt The isolator construction method for a seismic isolation floor according to claim 3, wherein the isolator is held by and the basic mortar is cured in that state.   The base-isolated floor according to claim 4, wherein a base mortar is constructed by providing joint rods along one side of the base plate of the isolator after or before filling the mortar, and a groove for removing the isolator is formed by removing the joint rods. Isolator construction method.   When replacing the isolator, remove the upper nut from the male threaded bolt, remove the male threaded bolt from the female threaded cylinder, and then remove the isolator from the base horizontally and remove it from the foundation mortar. 6. The seismic isolation floor according to claim 4 or 5, wherein a new isolator is fixed by inserting a male isolator on the foundation mortar and between the mounts, and then screwing a male screw bolt into the female screw cylinder and screwing an upper nut into the male screw bolt. Isolator construction method.