JP7214507B2 - Anti-vibration floating floor support spring expansion and contraction mechanism, construction method of anti-vibration floating floor, and replacement method of spring unit of anti-vibration floating floor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration isolation floating floor support spring expansion and contraction mechanism, a vibration isolation floating floor installation method, and a vibration isolation floating floor spring unit replacement method.

Conventionally, there have been cases where vibrations due to excitation forces generated on the floor are transmitted to the surroundings through the ground, causing vibration problems. In live houses, concert halls, dance studios, etc., there have been cases where the surrounding buildings swayed due to vibrations caused by so-called vertical movement, in which a large number of people move in time to the music.

As a countermeasure against such vibration problems, there is a method of designing a floor made of RC slabs as a floating floor insulated from the structural frame to suppress vibration propagation (see Patent Document 1 below). FIG. 34 shows the configuration of such a vibration isolation floating floor. The structural frame is partially recessed and a floating floor supported by springs is provided. The floating floor must be displaced vertically relative to the structural frame, and the displacement of the support springs corresponds to that. In order to increase the vibration damping effect, it is better to reduce the rigidity of the support springs and support the floor softly. However, if the rigidity of the support spring is too low, there is a possibility that problems will occur in usability as a floor, such as excessive sinking due to an overlying load and discomfort due to movement of the floor during walking. Therefore, in general, the characteristics of the support springs are set so that the vertical natural frequency of the floating floor is about 1 Hz or more and the vertical displacement during normal use is about 20 mm or less.

Air springs, disk springs, and coil springs are used as the support springs for the above floating floor. However, since air springs are expensive and require mechanical equipment such as compressors, disc springs and coil springs are often used in buildings. Such a spring member is generally assumed to deform only in the axial direction (supporting force direction), and if deformation occurs in the direction orthogonal to the axis, there is a possibility that the predetermined performance cannot be exhibited. Therefore, as shown in FIG. 34, a gap is provided between the floating floor and the structure for insulation so that the floating floor can be smoothly displaced vertically relative to the structural frame. Further, in order to prevent the support springs from being displaced in directions other than the direction of the supporting force, a horizontal restraint member may be provided between the floating floor and the structural frame for restraining the horizontal displacement of the floating floor.

JP 2013-53720 A

However, it is difficult to prevent horizontal movement of the floating floor during the construction of the floating floor. If the floating floor concrete is placed while being supported by the support springs, the performance of the springs may be adversely affected by the horizontal displacement of the support springs due to the influence of the work during placement and drying shrinkage of the concrete. In order to prevent this, when the floating floor concrete is cast, it is desirable to support the load with a temporary support member such as a shoring instead of supporting the load with the support spring, and after the floating floor concrete hardens, the load is transferred to the support spring. . In order to perform such load exchange work, it is necessary to expand and contract the support spring at the installation position.
In addition, if the support spring is damaged by an unexpected external force due to a large earthquake or the like, it will be necessary to replace the support spring. In order to replace the support springs, temporary support members such as shoring were installed to temporarily support the weight of the floating floor. After that, there is a need to change the load to a new support spring, and for this reason it is also necessary to expand and contract the support spring at the installation position.

Accordingly, the present invention has been made in view of the above circumstances, and provides a vibration-isolating floating floor support spring expansion and contraction mechanism that enables the support spring to expand and contract at the installation position during construction and replacement, and a vibration-isolating floating floor construction method. and a method for replacing the spring unit of the anti-vibration floating floor.

In order to achieve the above object, the present invention employs the following means .

A vibration-isolating floating floor support spring expansion and contraction mechanism according to the present invention is a vibration-isolation floating floor support spring expansion and contraction mechanism used when a floating floor is installed above a foundation, and comprises a lower body installed on the foundation and a lower body. an upper body disposed above the lower body on which a floating floor is installed; a lower plate fixed to the lower body; an upper plate fixed to the upper body; a spring unit having an intermediate plate arranged between them, a connecting portion connecting the upper plate and the intermediate plate, and a support spring arranged between the lower plate and the intermediate plate and a jack set capable of applying a downward force to the intermediate plate, and a temporary support member capable of supporting the upper body , wherein the jack set is capable of connecting the lower plate and the intermediate plate. It is characterized by comprising a steel bar and a jack provided on the steel bar and capable of applying a downward force to the intermediate plate .

In the anti-vibration floating floor support spring expansion and contraction mechanism configured in this way, it is not necessary to install a support frame for jack reaction force separately from the spring unit. Therefore , the spring unit can be expanded and contracted at the location where the spring unit is installed, and the installation and replacement of the spring unit can be performed more easily.

In the anti-vibration floating floor support spring expansion and contraction mechanism configured in this manner, the force for contracting the support spring by connecting the lower plate and the intermediate plate with the steel rod is transferred to the jack by loading the jack . Then, after releasing the connection between the lower plate and the intermediate plate, the jack can be unloaded to extend the support spring.

Further, in the construction method of the vibration-isolating floating floor according to the present invention , the spring unit is attached while the support spring of the spring unit is contracted and the lower plate and the intermediate plate of the spring unit are connected with a steel bar. A spring unit installation step for installing on the lower body, a temporary support member installation step for installing a temporary support member capable of supporting the floating floor, and an upper body installation step for installing the upper body above the spring unit. a floating floor construction step of constructing the floating floor above the upper body; a jack set installation step of installing a jack set on the intermediate plate of the spring unit; a steel bar removing step of removing the steel bars; and a load receiving change of removing the jack and extending the support spring of the spring unit to support the floating floor with the spring unit. and a step.

In the construction method for the vibration-isolating floating floor configured in this manner, the self-weight of the floating floor is supported by the temporary supporting members in the floating floor construction step. After at least a portion of the floating floor has formed (e.g., the first layer of concrete has hardened), the jack is unloaded in a load transfer step , the spring units extend, and the spring units support the floating floor. . Therefore, at the initial stage of construction of the floating floor, the self-weight of the floating floor is supported by temporary supporting members such as shoring . can be prevented from acting on the spring unit and adversely affecting the performance of the spring unit.

Further, a method for replacing a spring unit of a vibration-isolating floating floor according to the present invention is a method for replacing an existing spring unit of a vibration-isolating floating floor installed between a lower body and an upper body. In the replacement method, the existing jack set installation step of installing the jack set on the intermediate plate of the existing spring unit, installing a temporary support member on the lower body, and using the temporary support member a step of installing a temporary support member for supporting the upper body; releasing the connection between the upper plate of the existing spring unit and the upper body; loading the jack of the jack set; an existing spring unit contracting step of contracting the support spring of the spring unit; an existing spring unit contracting and holding step of connecting the lower plate and the intermediate plate of the existing spring unit with a steel bar; and removing the existing spring unit. and a step of removing the existing spring unit, while compressing the support spring of the new spring unit and connecting the lower plate and the intermediate plate of the new spring unit with a steel bar, and lowering the new spring unit A new spring unit installation step to be installed on the body, a new jack set installation step to install a jack set on the intermediate plate of the new spring unit, a jack of the jack set is loaded, and the steel a steel bar removing step of removing a bar; a new spring unit extending step of unloading the jack and extending a support spring of the new spring unit; and a new spring unit fixing step of fixing the upper plate of the new spring unit to the upper body and removing the jack set and the temporary support member. .

In the method for replacing the spring unit of the anti-vibration floating floor configured in this way, there is no need to install a support frame for the reaction force of the jack separately from the spring unit. Therefore , the spring unit can be expanded and contracted at the location where the spring unit is installed, and the spring unit can be replaced more easily.

According to the anti-vibration floating floor support spring expansion and contraction mechanism, construction method of the anti-vibration floating floor, and replacement method of the spring unit of the anti-vibration floating floor according to the present invention, an external force caused by the construction work acts on the spring unit during construction. This can prevent the performance of the spring unit from being adversely affected.

FIG. 4 is a diagram showing the basic configuration of a disk spring unit of the anti-vibration floating floor support spring extension/retraction mechanism according to one embodiment of the present invention; FIG. 4 is a conceptual diagram of the expansion and contraction of the disk spring unit of the anti-vibration floating floor support spring expansion and contraction mechanism according to the embodiment of the present invention, (a) showing the time of loading without preloading, and (b) supporting the floor by its own weight without preloading. (c) shows the time of loading with preloading, and (d) shows the time of preloading and supporting the floor by its own weight. 4 is a graph showing the movable range of the disc spring unit on the relationship between the load and the displacement of the disc spring of the anti-vibration floating floor support spring extension/retraction mechanism according to the embodiment of the present invention. FIG. 2(a) is an elevational view showing the configuration of a spring unit and a jack set, and (b) a plan view showing the configuration of the spring unit and a jack set, in the anti-vibration floating floor support spring extension/retraction mechanism according to one embodiment of the present invention. is. FIG. 4(a) is an elevational view showing the configuration of a spring unit and a jack set, and (b) the configuration of the spring unit and a jack set, in the anti-vibration floating floor support spring extension/retraction mechanism according to Modification 1 of one embodiment of the present invention. It is a plan view showing the. It is a front view (a) and a plan view (b) showing an installation example of a temporary support member in the anti-vibration floating floor support spring expansion and contraction mechanism according to Modification 1 of one embodiment of the present invention. It is a figure which shows the construction method of the anti-vibration floating floor support spring expansion-contraction mechanism which concerns on the modification 1 of one embodiment of this invention. FIG. 8 is a view showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to Modification 1 of one embodiment of the present invention, showing a process after the process shown in FIG. 7 ; FIG. 9 is a view showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to the modified example 1 of one embodiment of the present invention, and shows a post-process of the process shown in FIG. 8 . FIG. 10 is a diagram showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to the modified example 1 of the embodiment of the present invention, and shows the post-process of the process shown in FIG. 9 ; FIG. 11 is a diagram showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to Modification 1 of one embodiment of the present invention, and showing a post-process of the process shown in FIG. 10 ; FIG. 12 is a diagram showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to the modified example 1 of the embodiment of the present invention, and shows the post-process of the process shown in FIG. 11 . FIG. 13 is a diagram showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to Modification 1 of one embodiment of the present invention, and shows the post-process of the process shown in FIG. 12 . 14A and 14B are diagrams showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to the modified example 1 of the embodiment of the present invention, and showing a post-process of the process shown in FIG. 13; FIG. 15 is a diagram showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to the modified example 1 of one embodiment of the present invention, and showing a post-process of the process shown in FIG. 14 ; FIG. 16 is a view showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to Modification 1 of the embodiment of the present invention, showing a post-process of the process shown in FIG. 15 ; FIG. 17 is a diagram showing a method for constructing the anti-vibration floating floor support spring extension/contraction mechanism according to the modified example 1 of the embodiment of the present invention, showing a process after the process shown in FIG. 16 ; FIG. 9 is a plan view showing the configuration of the lower body and the lower plate of the anti-vibration floating floor support spring extension/contraction mechanism according to Modification 2 of one embodiment of the present invention. FIG. 19 is an elevational view of the anti-vibration floating floor support spring expansion/contraction mechanism according to Modification 2 of one embodiment of the present invention, viewed from direction A in FIG. 18 ; FIG. 19 is an elevational view of the anti-vibration floating floor support spring expansion/contraction mechanism according to Modification 2 of one embodiment of the present invention, viewed from the direction B in FIG. 18 ; FIG. 10 is a plan view showing the configuration of the upper plate of the vibration-proof floating floor support spring extension/retraction mechanism according to Modification 2 of one embodiment of the present invention. FIG. 11 is a plan view showing the configuration of an intermediate plate of the vibration-proof floating floor support spring extension/retraction mechanism according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing an installation state of an existing spring unit in the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing an existing jack set installation step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing a state immediately before an existing spring unit shrinking step in the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing an existing spring unit shrinking step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing an existing spring unit shrinking and holding step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing an existing spring unit removing step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing a new spring unit installation step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. It is an elevation view which shows the new jack installation process of the replacement|exchange method of the spring unit of the anti-vibration floating floor based on the modified example 2 of one Embodiment of this invention. FIG. 10 is an elevational view showing a steel bar removing step in the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 10 is an elevational view showing a new spring unit extension step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. FIG. 11 is an elevational view showing a new spring unit fixing step of the method for replacing the spring unit of the vibration-isolating floating floor according to Modification 2 of one embodiment of the present invention. It is a figure which shows the structure of the conventional anti-vibration floating floor.

The construction method of the anti-vibration floating floor support spring extension mechanism and anti-vibration floating floor of the present invention will be described.
First, the support spring (spring unit 2) used in the anti-vibration floating floor support spring expansion and contraction mechanism of the present invention and the difference in sinking of the support spring depending on the presence or absence of preload will be described.

If the rigidity and vertical stroke required for the anti-vibration floating floor are secured, the length of the support spring will be considerably long, making it difficult to handle during carrying-in/installation and replacement work. In addition, it is very difficult to work if the springs are contracted at any time when the floating floor concrete is placed. For example, assume a RC floor with a floor area of 600 m 2 (thickness of 1 m) and a floating floor of 1 Hz.

Floor dead weight: 2.4 t/m3 x 600 m2 x 1 m = 1440 t, floating floor natural vibration of 1 Hz, and support spring stiffness of 57 kN/mm, the required vertical displacement of the support spring is 270 mm as shown in the following formula (1). That's it.

FIG. 1 is a diagram showing the basic configuration of a disc spring unit.
A disk spring unit 110 as shown in FIG. 1 is assumed as a support spring. As shown in FIG. 1, the disc spring unit 110 mainly includes a lower plate 101, an upper plate 102, upper and lower seat plates 103 and 104, a plurality of disc springs 105, and guides .

Disc spring unit 110 can set arbitrary characteristics by its shape and combination. FIG. 1 shows a combination of a number of disk springs 105 of arbitrary shape in order to obtain a predetermined rigidity and stroke.

2A and 2B are conceptual diagrams of expansion and contraction of the disc spring unit 110. (a) shows the state at the time of loading without preloading, (b) the state at the time of supporting the floor's own weight without preloading, and (c) the state at the time of loading with preloading. (d) shows the time when the load is preloaded and the weight of the floor is supported.
As shown in FIG. 2, the length of the overlapped portion of the disc springs is approximately 1,000 mm.

As shown in FIGS. 2(a) and 2(b), when there is no preload, it is necessary to set the entire required vertical displacement amount as the range of motion (set at 290 mm), so the total length of the disc spring unit 110 at the time of loading is long. , The amount of sinking due to the floor's own weight during construction is large.

On the other hand, in Figs. 2(c) and 2(d), a load corresponding to 70% (174 mm) of the sinking amount due to the floor's own weight is applied as a preload at the time of factory manufacture, and the length of the spring is shortened to a predetermined dimension. is the case. In this case, the range of motion can be kept small (set to 120 mm in FIG. The overall length can be shortened when carrying in, making transportation and movement work easier. In addition, since the spring does not displace vertically until the amount of concrete placed exceeds 70%, variations in the amount of settlement due to the spring are reduced, making construction easier.

The amount of preload to be introduced is determined by considering the vertical range of motion required when using a floating floor and the construction method.
FIG. 3 is a graph showing the range of motion of the disc spring unit 110 on the relationship between the load and the displacement of the disc spring of the support spring expansion/contraction mechanism according to the embodiment of the present invention.
As shown in Fig. 3, the necessary vertical range of motion is determined by taking into account the sinking due to the weight of the audience (static displacement), the displacement due to vertical vibration (dynamic displacement), and the amount of displacement during an earthquake, if necessary. Within the preload settable range where the vertical range of motion can be secured, the preload setting value is determined in consideration of the method of placing the floating floor concrete.

Next, the anti-vibration floating floor support spring expansion and contraction mechanism will be described.
FIG. 4 is (a) an elevational view showing the configuration of a spring unit and a jack set, and (b) a plan view showing the configuration of a spring unit and a jack set in the vibration isolation floating floor support spring expansion and contraction mechanism. FIG. 4 shows a state in which the jack is unloaded, the disc springs are extended, and the load is received by the disc spring unit after the first concrete layer, which will be described later, has hardened.
The anti-vibration floating floor support spring expansion and contraction mechanism is a mechanism for adjusting the length of the support spring used when temporarily supporting members such as shoring support the floating floor load, and then the load is transferred to the support spring. be.

As shown in FIG. 4, the anti-vibration floating floor support spring expansion and contraction mechanism 100 includes a lower capital (lower body) 11 installed on a base mat (foundation) M and an upper capital (upper body) 11 on which the floating floor F is installed. ) 12 , a spring unit (first spring unit) 2 and a jack set (first jack set) 3 arranged between the lower capital 11 and the upper capital 12 .

As shown in FIG. 4B, the lower capital 11 and the upper capital 12 are larger than the spring unit 2 and the jack set 3 in plan view. In this embodiment, the lower capital 11 and the upper capital 12 are rectangular in plan view, but the shape can be appropriately set.

The spring unit 2 has a lower plate 21 , an upper plate 22 and a spring body (support spring) 23 . In this embodiment, the spring body 23 is configured by installing a plurality of disc springs 23a in the vertical direction. In this embodiment, the lower plate 21, the upper plate 22, and the disc spring 23a have a circular shape in a plan view, but the shape can be appropriately set to a rectangular shape or the like.

The lower plate 21 is fixed to the lower capital 11 with anchor bolts a1 or the like.
The upper plate 22 is arranged below the upper capital 12 . In the state shown in FIG. 4 , the upper plate 22 is arranged in contact with the lower surface of the upper capital 12 . The upper plate 22 can be fixed to the upper capital 12 with an upper fixing nut n1.

The jack set 3 has a reaction support frame 30 , a PC steel bar (first steel bar) 41 , and a center hole jack (first jack) 43 . In this embodiment, the jack sets 3 are set on both sides of the spring unit 2 .

The reaction force support frame 30 has a lower fixing plate 31 , an upper fastening plate 32 and a support frame 33 .

The lower fixed plate 31 is arranged adjacent to the lower plate 21 of the spring unit 2 .
The lower fixed plate 31 is fixed to the lower capital 11 with anchor bolts a2 or the like. The upper fastening plate 32 is arranged above the lower fixing plate 31 . The support frame 33 connects the lower fixing plate 31 and the upper fastening plate 32 .

The PC steel bar 41 extends vertically. The upper end of the PC steel rod 41 is inserted through a through hole (not shown) formed in the upper plate 22 and fastened with an upper nut n11. An intermediate nut (position holding member) n12 is provided in the middle of the PC steel rod 41 in the vertical direction. The intermediate nut n12 is provided below the upper fastening plate 32. As shown in FIG. A lower nut n<b>13 for fixing the center hole jack 43 to the PC steel bar 41 is provided at the lower end of the PC steel bar 41 .

The center hole jack 43 is, for example, a hydraulic type, and has a circular shape in a plan view, and a through hole (not shown) penetrating vertically is formed in the center. A PC steel rod 41 is inserted through the through hole.

FIG. 5 shows a modified example 1 of the vibration-isolating floating floor support spring expansion and contraction mechanism described above.
FIG. 5 is an elevational view showing (a) the configuration of a spring unit and a jack set, and (b) the spring unit and It is a top view which shows the structure of a jack set.
As shown in FIG. 5, in the anti-vibration floating floor support spring extension mechanism 100A of this modified example, the lower plate 21A of the spring unit (first spring unit) 2A is integrated with the lower fixing plate 31 of the jack set 3. , the support frame 33 of the jack set 3 is fixed to the lower plate 21A.

FIG. 6 shows an installation example of a temporary support member in Modification 1 of the anti-vibration floating floor support spring extension/contraction mechanism, and is (a) a front view and (b) a plan view.
As shown in FIG. 6, in the anti-vibration floating floor support spring expansion and contraction mechanism 100A, shoring (first temporary support members) 45 and 46 are installed. The shoring 45 is provided on both sides of the lower capital 11 and the upper capital 12 . The shorings 46 are installed at the four corners of the lower capital 11 and the upper capital 12, which are rectangular in plan view.

Next, a construction method for the vibration-isolating floating floor F will be described with reference to FIGS. 7 to 17. FIG. In the following explanation of the construction method, a method using the anti-vibration floating floor support spring expansion/contraction mechanism 100 will be explained.
(Spring unit installation process)
A lower capital 11 is secured to the base mat M, as shown in FIG. The lower plate 21 of the spring unit 2 is fixed to the lower capital 11 with anchor bolts a1 (see FIG. 4(a)) or the like.

(Jack set installation process)
A reaction support frame 30 is installed on the lower capital 11 . The lower fixing plate 31 (see FIG. 4A) of the reaction force support frame 30 is fixed to the lower capital 11 with anchor bolts a2 (see FIG. 4A) or the like. A PC steel rod 41 is inserted through the through hole of the upper plate 22 of the spring unit 2 and fastened to the upper plate 22 with a nut n11. A center hole jack 43 is set on the PC steel bar 41 . A lower nut n13 is fastened to the lower end of the PC steel bar 41 to fix the center hole jack 43 to the PC steel bar 41 . The pressure (preload) of the disk spring 23a (see FIG. 4, the same applies hereinafter) of the spring unit 2 is set to 296 kN.

(Temporary support member installation process)
As shown in FIG. 8, a shoring 45 is installed on the base mat M, and the length of the shoring 45 is adjusted to support the formwork F1. Also, a shoring 46 is installed on the lower capital 11 and the length of the shoring 46 is adjusted to support the upper capital 12 .

(Upper capital (upper body) installation process)
An upper capital 12 is installed above the upper plate 22 of the spring unit 2 and the reaction support frame 30 . A formwork F1 for the floating floor F is set on the upper capital 12. - 特許庁

(Downward force applying process)
As shown in FIG. 9, the center hole jack 43 is loaded to pull the PC steel bar 41 downward. The upper end of the PC steel rod 41 is connected to the disc spring 23a of the spring unit 2 by an upper nut n11. This applies a downward force to the upper plate 22 of the spring unit 2 .

As shown in FIG. 10, the intermediate nut n12 is tightened up to the upper fastening plate 32 to hold the PC steel rod 41 at the current position of the reaction force support frame 30. As shown in FIG. Unload the center hole jack 43 . A tensile force of 174 kN is generated in the PC steel rod 41 between the position of the upper nut n11 fastened to the upper plate 22 and the position of the intermediate nut n12 fastened to the upper fastening plate 32 . A mark P (see FIG. 11) is made on the PC steel rod 41 to indicate the position of the lower nut n13.

As shown in FIG. 11, the lower nut n13 is removed from the PC steel bar 41, and the center hole jack 43 is removed. The center hole jack 43 is temporarily placed because it will be used again when extending the spring unit 2 in the subsequent process.

(Floating floor construction process)
As shown in FIG. 12, a first layer of concrete F11 is placed. Since the concrete is divided into a plurality of layers and placed, only the first layer of concrete F11 is placed at this stage. In this state, the first layer concrete F11 is supported by the shoring 45 and the shoring 46 supporting the upper capital 12 .

The first layer of concrete is cured and dried to shrink. A horizontal steady rest (not shown) will be installed on the outer circumference of the floor.

As shown in FIG. 13, the center hole jack 43 is set on the PC steel bar 41, and the lower nut n13 is tightened at the marked location.

(load receiving replacement process)
As shown in FIG. 14, the center hole jack 43 is loaded to apply a slightly larger load than the load when the spring unit 2 is contracted. As a result, a tensile force is generated in the entire PC steel bar 41, and the intermediate nut n12 of the PC steel bar 41 can be released. The intermediate nut n12 is loosened to a position where a 30 mm gap is created between it and the upper fastening plate 32.

As shown in FIG. 15, the center hole jack 43 is slowly unloaded to extend the disc spring 23a of the spring unit 2 so that the spring unit 2 supports the upper capital 12 and the concrete F11. The upper plate 22 of the spring unit 2 is fixed to the upper capital 12 with an upper fixing nut n1 (see FIG. 4; the same shall apply hereinafter).

As shown in FIG. 16, the lower nut n13 is removed from the PC steel bar 41, and the center hole jack 43 is removed. The center hole jack 43 is used when extending or contracting another spring unit 2. - 特許庁

As shown in FIG. 17, the shorings 45 and 46 are removed, and the remaining concrete is placed in this state. Note that the reaction force support frame 30 and the PC steel rods 41 may remain installed so that they can be used when the spring unit 2 is replaced.
In addition, in the case of using the anti-vibration floating floor support spring extension/retraction mechanism 100A, the reaction force support frame 30 is previously fixed to the lower plate 21A of the spring unit 2, and the spring unit 2 and the jack set 3 are integrated. Therefore, the installation is the same as the case where the anti-vibration floating floor support spring extension mechanism 100 is used, except that it is installed integrally.

In the construction method of the vibration isolation floating floor F described above, when a large number of spring units 2 are installed, the reaction force support frame 30 is required for the number of the spring units 2, but the center hole jack 43 is provided with a plurality of reaction force support frames. Since the center hole jacks 43 can be used one after another at 30, it is not necessary to prepare the center hole jacks 43 for the number of the spring units 2.例文帳に追加

In addition, it is difficult to prevent an external force in the horizontal direction from being applied to the load bearing member due to the influence of the concrete placing work and drying shrinkage of the concrete during construction. Horizontal displacement of the spring unit 2 can be prevented by transferring the load to the spring unit 2 after the first layer of concrete has been placed and the drying shrinkage of the concrete has been completed. The 1st layer concrete should be thick enough to prevent the spring unit 2 from being affected by drying shrinkage of the 2nd and 3rd layers. The floating floor F is fixed to constrain horizontal movement.

In addition, although the floating floor F is supported by a large number of spring units 2, it is very difficult to adjust the floor top level by placing concrete because the rigidity of the spring units 2 and the weight of the floating floor F vary. is. Therefore, after all the placement is completed, the height of the spring unit 2 is adjusted by using the jack set 3 to shorten the spring unit 2 and inserting a filler or the like as necessary to adjust the top level of the floor. This work can be carried out at any time after the concrete placement of the floating floor F is completed.

Next, a method for exchanging the spring unit 2 of the anti-vibration floating floor F will be described.
An unexpected external force acts due to an earthquake or the like, causing damage to the spring unit 2 of the anti-vibration floating floor F, and it may be necessary to replace the damaged spring unit 2 .
First, the case of exchanging the spring unit 2 of the anti-vibration floating floor support spring expansion/contraction mechanism 100 will be described.
As shown in FIG. 17, shorings 45 and 46 (see FIG. 6) are installed after the spring unit 2, reaction force support frame 30 and PC steel rod 41 are installed.

Replacement temporary fixing jigs 51 and 52 (see FIG. 4, the same applies hereinafter) are installed on the upper plate 22 and the lower plate 21 of the spring unit 2, respectively. The replacement temporary fixing jig 51 is installed so as to extend downward from the upper plate 22 . The replacement temporary fixing jig 52 is installed so as to extend upward from the lower plate 21 . At this stage, it is not necessary to connect the replacement temporary fixing jigs 51 and 52 together. As the replacement temporary fixing jigs 51 and 52, for example, flat steel can be used.

Next, as shown in FIG. 9, a center hole jack 43 is set on the PC steel bar 41, and the upper fixing nut n1 (see FIG. 4) is removed. A center hole jack 43 is loaded, the PC steel rod 41 is pulled downward, and the disk spring of the spring unit 2 is contracted.

The replacement temporary fixing jigs 51 and 52 are connected to each other with bolts 53 (see FIG. 4, the same shall apply hereinafter) or the like, and the spring unit 2 is maintained in a contracted state.

As shown in FIG. 10, the center hole jack 43 is unloaded. The upper nut n11 is removed, the PC steel bar 41 is pulled down, and the connection between the upper plate 22 and the PC steel bar 41 is released. The connection between the lower plate 21 and the lower capital 11 is released, and the spring unit 2 is removed.

A new spring unit 2 is brought in and installed in a state of being contracted by temporary fixing jigs 51 and 52 for replacement. The PC steel rod 41 is inserted through the through hole of the upper plate 22 and fastened to the upper plate 22 . Once loaded with the center hole jack 43, the replacement temporary fixing jigs 51 and 52 are removed. After that, the center hole jack 43 is unloaded, the spring unit 2 is extended, and the load is transferred from the shorings 45 and 46 to the spring unit 2 side. Finally, the shorings 45, 46 are removed.

Next, the case of replacing the spring unit 2 of the anti-vibration floating floor support spring expansion/contraction mechanism 100A will be described.
As shown in FIG. 17, shorings 45 and 46 (see FIG. 6) are installed after the spring unit 2, reaction force support frame 30 and PC steel rod 41 are installed.

As shown in FIG. 9, the center hole jack 43 is set on the PC steel bar 41, and the upper fixing nut n1 is removed. A center hole jack 43 is loaded, the PC steel rod 41 is pulled downward, and the disk spring of the spring unit 2 is contracted.

Next, as shown in FIG. 10, the intermediate nut n12 is tightened up to the upper fastening plate 32, and the center hole jack 43 is unloaded. The lower nut n13 is removed from the PC steel bar 41, and the center hole jack 43 is removed.

The joint between the lower plate 21 and the lower capital 11 is released, and the spring unit 2, the reaction force support frame 30 and the PC steel rod 41 are removed as a unit.

A new spring unit 2 and a reaction force support frame 30 are brought in and installed with the spring unit 2 contracted. The PC steel rod 41 is inserted through the through hole of the upper plate 22 and fastened to the upper plate 22 . The center hole jack 43 is set and loaded, and the intermediate nut n12 is once loosened. After that, the center hole jack 43 is unloaded, the spring unit 2 is extended, and the load is transferred from the shorings 45 and 46 to the spring unit 2 side. Finally, the shorings 45, 46 are removed.

In the construction method of the anti-vibration floating floor support spring extension mechanism 100 and the construction method of the anti-vibration floating floor F constructed in this way, the jack set 3 applies a downward force to the spring unit 2 by the jack set 3 when constructing the floating floor F. Keep the overall length of the unit 2 short. When constructing the floating floor F, the floating floor F is supported by shorings 45 and 46. - 特許庁After at least part of the floating floor F is formed (for example, the first layer of concrete has hardened), the downward force is removed from the spring unit 2 using the jack set 3, and the total length of the spring unit 2 is lengthened. , the spring unit 2 supports the floating floor F. Therefore, when the floating floor F is constructed, it is the shorings 45 and 46 that support the weight of the floating floor F, and the spring units 2 are insulated from the floating floor F. Acting on the unit 2 and adversely affecting the performance of the spring unit 2 can be prevented.

In addition, by preloading the spring unit 2 at the time of factory production to reduce the spring length, the overall length of the spring unit 2 is shortened at the time of carrying-in and construction, which facilitates handling and good workability.

When the center hole jack 43 is loaded while the upper plate 22 is not fixed to the upper capital 12, the PC steel rod 41 is pulled downward and moves downward relative to the reaction force support frame 30. . Since downward force is applied to the upper plate 22 of the spring unit 2 connected to the PC steel rod 41, the overall length of the spring unit 2 is shortened. In this state, if the PC steel rod 41 is fixed to the reaction force support frame 30 at the current position by the intermediate nut n12, the state in which the overall length of the spring unit 2 is short is maintained. In this state, the center hole jack 43 can be unloaded and removed. In this state, the PC steel rod 41 has a tensile force between the position holding member for the upper plate 22 and the intermediate nut n12.
Further, from this state, the center hole jack 43 is installed and a force greater than the load when the spring unit 2 is contracted is applied to apply a tensile force to the entire PC steel bar 41. After that, the PC steel bar 41 is lowered. When the center hole jack 43 is unloaded after loosening the intermediate nut n12 fixed to the reaction force support frame 30, the overall length of the spring unit 2 is increased.
By using the anti-vibration floating floor support spring expansion/contraction mechanism 100 in this manner, the length of the spring unit 2 can be easily adjusted.

In addition, when the floating floor F is constructed with concrete, the self-weight of the floating floor F is received by the shorings 45 and 46, thereby preventing the spring unit 2 from being horizontally displaced due to the influence of construction work and drying shrinkage. As a result, it is possible to prevent a load from acting on the spring unit 2 in a direction other than the load supporting direction and adversely affect the spring performance.

Further, by using the spring unit 2 and the jack set 3, it is possible to adjust the height and level of the top end of the floating floor F by adjusting the height of the spring after concrete placement of the floating floor F is completed.

In addition, by permanently installing the reaction force support frame 30 and the PC steel rod 41, if the center hole jack 43 and the shorings 45 and 46 are prepared when the spring unit 2 needs to be replaced, the jack set 3 can be used. Exchange work can be done. Instead of lifting the entire floor, the spring unit 2 is shrunk and the old spring unit 2 is taken out, so replacement work can be performed one by one without affecting the surroundings.

Next, the vibration isolation floating floor support spring expansion/contraction mechanism according to Modification 2 of the embodiment of the present invention and the replacement method of the spring unit of the vibration isolation floating floor using this vibration isolation floating floor support spring expansion/contraction mechanism will be mainly described. Description will be made with reference to FIGS. 18 to 33. FIG.
In the description of the modification shown below, the same reference numerals are given to the same members as those described above, and the description thereof will be omitted.
As shown in FIGS. 18 to 22, the anti-vibration floating floor support spring extension mechanism 100B includes a lower capital (lower body) 11B installed on a base mat (M shown in FIG. 4) and a floating floor ( An upper capital (upper body) 12B where F) shown is installed, a spring unit (second spring unit) 2B and a jack set (second jack set) 3B arranged between the lower capital 11B and the upper capital 12B, and a shoring (second temporary support member) 46B (see FIG. 24) that supports the upper capital 12B.

As shown in FIG. 18, the lower capital 11B has a rectangular shape in plan view, but the shape can be appropriately set.

Here, in the horizontal direction, the direction along one side 11c of the rectangular lower capital 11B (horizontal direction of the paper surface shown in FIG. 18) is defined as the X direction, and the direction along the side 11d orthogonal to the side 11c (the paper surface shown in FIG. 18) is the X direction. vertical direction) is the Y direction.

The upper surface of the lower capital 11B is formed with a notch portion 11j recessed toward the center from the side 11c and the side 11e opposite to the side 11c. In other words, the notch 11j extends in the Y direction from the inner side of the lower capital 11B in plan view. The notch 11j is formed on both sides of the lower capital 11B in the Y direction.

As shown in FIG. 19, the spring unit 2B has a lower plate 21B, an upper plate 22B, an intermediate plate 22C, a spring main body (support spring) 23B, and a connecting pipe (connecting portion) 24. .

As shown in FIG. 18, the lower plate 21B has a circular shape in plan view, but the shape can be set as appropriate. A plurality of bolt mounting holes 21h are formed through the lower plate 21B in the vertical direction.

The lower plate 21B is formed with notches 21j, 21k, and 21m that are recessed inward from both ends on the outside in the Y direction. The cutouts 21j, 21k, and 21m are arranged in this order in the X direction. The cutouts 21j, 21k, and 21m are formed on both sides of the lower plate 21B in the Y direction.

As shown in FIG. 19, a bolt c1 is inserted through a bolt mounting hole 21h (see FIG. 18; the same applies hereinafter) of the lower plate 21B and screwed into an anchor bolt b1 provided on the lower capital 11B.

As shown in FIG. 21, the upper plate 22B has a rectangular shape in plan view, but the shape can be set as appropriate. A plurality of bolt mounting holes 22h are formed through the upper plate 22B in the vertical direction. As shown in FIG. 19, a bolt c2 is inserted through a bolt mounting hole 21h (see FIG. 21; the same applies hereinafter) of the upper plate 22B and screwed into an anchor bolt b2 of the upper capital 12B.

The intermediate plate 22C is arranged between the lower plate 21B and the upper plate 22B. As shown in FIG. 22, the intermediate plate 22C has a circular shape in plan view, but the shape can be set as appropriate.

Notch portions 22j, 22k, and 22m are formed in the intermediate plate 22C so as to be recessed inward from both ends on the outside in the Y direction. The cutouts 22j, 22k, and 22m are arranged in this order in the X direction. The cutouts 22j, 22k, and 22m are formed on both sides of the intermediate plate 22C in the Y direction.

As shown in FIG. 19, the spring body 23B is arranged between the lower plate 21B and the intermediate plate 22C. In this embodiment, the spring main body 23B is configured by installing a plurality of disc springs 23a in the vertical direction. Although the disc spring 23a has a circular shape in a plan view, the shape can be appropriately set.

The connecting pipe 24 has a tubular shape extending in the vertical direction. The connecting pipe 24 connects the upper plate 22B and the intermediate plate 22C.

The jack set 3B has a fixing PC steel bar (second steel bar) 41B, a center hole jack (second jack) 43B, and a jacking PC steel bar 41C.

The fixing PC steel rod 41B extends vertically. The fixing PC steel rod 41B connects the lower plate 21B and the intermediate plate 22C.

The center hole jack 43B is, for example, hydraulic. The center hole jack 43B can apply downward force to the intermediate plate 22C.

Although the center hole jack 43B has a circular shape in a plan view, the shape can be appropriately set. A through hole (not shown) penetrating vertically is formed in the center of the center hole jack 43B in plan view. A jacking PC steel rod 41C is inserted through the through-hole. The jacking PC steel rod 41C is fixed to the lower plate 21B.

As shown in FIG. 18, the lower ends of the fixing PC steel rods 41B are arranged at the inner edges in the Y direction of the cutouts 21j and 21m of the lower plate 21B. The lower end of the jacking PC steel rod 41C is arranged at the Y-direction inner edge of the notch 21k of the lower plate 21B.

As shown in FIG. 22, the upper ends of the fixing PC steel rods 41B are arranged at the inner edges in the Y direction of the cutouts 22j and 22m of the intermediate plate 22C. The upper end of the jacking PC steel rod 41C is arranged at the inner edge in the Y direction of the notch 22k of the intermediate plate 22C.

Next, a method of exchanging the spring unit of the anti-vibration floating floor using the anti-vibration floating floor support spring expansion/contraction mechanism 100B will be described mainly with reference to FIGS. 23 to 33. FIG. The method replaces an existing spring unit with a new spring unit.
In the following description, the existing spring unit 2B is referred to as an existing spring unit 2B1, and the new spring unit 2B is referred to as a new spring unit 2B2.

As shown in FIG. 23, an existing spring unit 2B1 is installed between the lower capital 11B and the upper capital 12B.

(Existing jack set installation step S1)
As shown in FIG. 24, the lower plate 21B and the intermediate plate 22C are connected by the jacking PC steel rod 41C. Since notch portions 21k and 22k are formed in the lower plate 21B and the intermediate plate 22C, respectively, when the PC steel bar for jack 41C is installed, the PC steel bar for jack 41C is horizontally moved in the Y direction. All you have to do is The jacking PC steel bar 41C is positioned by bringing the jacking PC steel bar 41C into contact with the inner edges of the cutouts 21k and 22k.
Also, a center hole jack 43B is attached to the jacking PC steel rod 41C, and the center hole jack 43B is installed on the intermediate plate 22C.

(Temporary support member installation step S2)
A shoring 46B is installed on the lower capital 11B. The self-weight of the upper capital 12B and the floating floor F above the upper capital 12B (see FIG. 4, the same shall apply hereinafter) is supported (temporarily supported) by the shoring 46B.

(Existing spring unit shrinking step S3)
As shown in FIG. 25, bolts c1 (see FIG. 24; the same shall apply hereinafter) fixing the lower plate 21B to the lower capital 11B and bolts c2 (see FIG. 24) fixing the upper plate 22B to the upper capital 12B. Same hereafter.) is removed. Then, as shown in FIG. 26, the center hole jack 43B is loaded to shrink the spring body 23B of the existing spring unit 2B1 to a predetermined height. In this condition, the shoring 46B supports the upper capital 12B.

(Existing spring unit contraction holding step S4)
As shown in FIG. 27, the fixing PC steel rod 41B connects the lower plate 21B and the intermediate plate 22C to keep the spring body 23B compressed to a predetermined height. The lower plate 21B and the intermediate plate 22C are formed with notches 21m, 21j, 22m, and 22j, respectively. should be moved horizontally to The fixing PC steel bar 41B is positioned by bringing the fixing PC steel bar 41B into contact with the inner edges of the notches 21m, 21j, 22m, and 22j.

(Existing spring unit removal step S5)
After unloading the center hole jack 43B, as shown in FIG. 28, the center hole jack 43B (see FIG. 27) and the jacking PC steel rod 41C (see FIG. 27) are removed, and the existing spring unit 2B1 is contracted. Remove in condition. When removing the PC steel bar for jack 41C, the PC steel bar for jack 41C is horizontally moved in the Y direction through the notches 21k and 22k of the lower plate 21B and the intermediate plate 22C.

(New spring unit installation step S6)
As shown in FIG. 29, the new spring unit 2B2 is contracted, the lower plate 21B and the intermediate plate 22C are connected with the fixing PC steel rod 41B, and the spring body 23B is kept contracted to a predetermined height. The new spring unit 2B2 thus constructed is brought in and installed on the lower capital 11B. Since the lower end portion of the fixing PC steel rod 41B protrudes from the lower plate 21B, it is installed so that the protruding portion comes to the notch 11j in the Y direction of the lower capital 11B. By installing in this way, it is possible to horizontally take out the fixing PC steel bar 41B and the jacking PC steel bar 41C after the spring unit is replaced.

(New jack set installation step S7)
As shown in FIG. 30, the lower plate 21B and the intermediate plate 22C are connected by the jacking PC steel rod 41C. A center hole jack 43B is attached to the jacking PC steel rod 41C, and the center hole jack 43B is installed on the intermediate plate 22C. When installing the jacking PC steel bar 41C, the jacking PC steel bar 41C is horizontally moved in the Y direction through the notches 21k and 22k of the lower plate 21B and the intermediate plate 22C.

(Steel bar removal step S8)
As shown in FIG. 31, the center hole jack 43B is loaded to apply a slightly larger load than when the spring body 23B is compressed, and the nut of the fixing PC steel rod 41B (see FIG. 30; the same shall apply hereinafter) is applied. can be loosened, and the fixing PC steel rod 41B is removed. When removing the fixing PC steel bar 41B, the fixing PC steel bar 41B is horizontally moved in the Y direction through the notches 21m, 21j, 22m, 22j of the lower plate 21B and the intermediate plate 22C.

(New spring unit extension step S9)
As shown in FIG. 32, the center hole jack 43B is unloaded, the spring body 23B is extended, and the weight of the floating floor F is transferred to the new spring unit 2B2.

(New spring unit fixing step S10)
As shown in FIG. 33, the lower plate 21B and the lower capital 11B are fixed with bolts c1. The upper plate 22B and the upper capital 12B are fixed with bolts c2. The center hole jack 43B (see FIG. 32), the PC steel bar 41C for jack (see FIG. 32) and the shoring 46B are removed. When removing the PC steel bar for jack 41C, the PC steel bar for jack 41C is horizontally moved in the Y direction through the notches 21k and 22k of the lower plate 21B and the intermediate plate 22C.

In addition, from the new jack set installation step S7 after installing the new spring unit 2B1 to the new spring unit extension step S9, when the load is transferred to the new spring unit 2B2, the spring body 23B is extended by the center hole jack 43B. Besides the method, it is also possible to take a method of filling the space between the upper plate 22B and the upper capital 12B with grout (not shown). In the case of the method of burying with grout, there is an advantage that the rising accuracy of the new spring unit 2B2 can be ensured without being affected by the installation accuracy of the upper capital 12B. However, when replacing the spring unit installed by the grouting method, it is necessary to remove the grout.

Next, a construction method of a vibration-isolating floating floor using the vibration-isolating floating floor support spring expansion/contraction mechanism 100B will be described.
The (new) spring unit installation step S6 shown in the replacement method of the spring unit of the anti-vibration floating floor is performed.

(Temporary support member installation process)
Next, a shoring 46B capable of supporting a floating floor F, which will be described later, is installed.

(Upper body installation process)
An upper capital 12B is installed above the spring unit 2B2 and the jack set 3B.

(Floating floor construction process)
A floating floor F is constructed above the upper capital 12B.

Next, the (new) jack set installation step S7, the steel bar removal step S8, the (new) spring unit extension step S9, and the (new) spring unit fixing step S10 shown in the replacement method of the spring unit of the vibration isolation floating floor. I do.
By the spring unit extending step S9 and the spring unit fixing step S1, the weight of the floating floor F can be supported by the spring unit 2B2 (load receiving switching step).

When adjusting the height of the top level of the floating floor F, after performing the existing jack set installation step S1 to the existing spring unit shrinking step S3, the necessary gap between the upper plate 22B and the upper capital 12B and install a scissors material (steel plate, etc.) with a thickness of , and fill the gap between the new spring unit extension step S9 and the new spring unit fixing step S10 described above, or between the installed scissors material and the upper capital 12B. recover by doing.

In the anti-vibration floating floor support spring expansion/contraction mechanism 100B configured in this way, there is no need to install a support frame for jack reaction force separately from the spring unit 2B. Therefore, the spring unit 2B can be expanded and contracted at the location where the spring unit 2B is installed, and the installation and replacement of the spring unit 2B can be performed more easily.

In addition, the force that connects the lower plate 21B and the intermediate plate 22C with the fixing PC steel rod 41B to contract the spring body 23B is transferred to the center hole jack 43B by loading the center hole jack 43B, and the lower plate 21B and the intermediate plate 22C, the center hole jack 43B can be unloaded to extend the spring body 23B.

In the floating floor construction process, the weight of the floating floor F is supported by the shoring 46B. After at least a part of the floating floor F is formed (for example, the concrete of the first layer is hardened), the center hole jack 43B is unloaded in the load exchange process, the spring unit 2B is extended, and the floating floor F is replaced by the spring unit. 2B supports. Therefore, when the floating floor F is constructed, the weight of the floating floor F is supported by the second temporary supporting member such as the shoring 46B. It is possible to prevent the resulting external force from acting on the second spring unit and adversely affecting the performance of the spring unit 2B.

Further, the spring unit 2B can be held in a contracted state by using the fixing PC steel rod 41B, and the center hole jack 43B is used only when the spring unit 2B is expanded and contracted (momentarily). That is, after contracting one spring unit 2B with the center hole jack 43B, the center hole jack 43B can be used for contracting the other spring unit 2B. Therefore, it is not necessary to prepare center hole jacks 43B for the number of spring units 2B.

Notches 21j, 21k, 21m, 22j, 22k, and 22m are formed in the lower plate 21B and the intermediate plate 22C, respectively. , the fixing PC steel bar 41B and the jacking PC steel bar 41C should be horizontally moved in the Y direction. Therefore, it is not necessary to lift up the fixing PC steel bar 41B and the jacking PC steel bar 41C, which improves workability.

It should be noted that the various shapes, combinations, etc., of the constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

2, 2A... Spring unit (first spring unit)
3 ... Jack set (first jack set)
11 ... lower capital (lower body)
12 ... upper capital (upper body)
21, 21A...Lower plate 22...Upper plate 23...Spring body (support spring)
30... Reaction force support frame 31... Lower fixing plate 32... Upper fastening plate 33... Support frame 41... PC steel bar (first steel bar)
43 … Center hole jack (first jack)
45, 46 ... Shoring (first temporary support member)
100, 100A... Anti-vibration floating floor support spring expansion/contraction mechanism F... Floating floor M... Foundation mat (foundation)
n12... Intermediate nut (position holding member)

Claims (3)

An anti-vibration floating floor support spring expansion and contraction mechanism used when installing a floating floor above a foundation,
a lower body installed on the foundation;
an upper body disposed above the lower body and on which a floating floor is installed;
a lower plate fixed to the lower body, an upper plate fixed to the upper body, an intermediate plate disposed between the lower plate and the upper plate, and connecting the upper plate and the intermediate plate a spring unit having a connecting portion and a support spring disposed between the lower plate and the intermediate plate;
a jack set capable of applying a downward force to the intermediate plate;
a temporary support member capable of supporting the upper body ,
The jack set is
a steel rod capable of connecting the lower plate and the intermediate plate;
and a jack that is provided on the steel bar and that can apply a downward force to the intermediate plate . a spring unit installation step of installing the spring unit on the lower body while compressing the support spring of the spring unit and connecting the lower plate and the intermediate plate of the spring unit with a steel rod;
a temporary support member installing step of installing a temporary support member capable of supporting the floating floor;
an upper body installation step of installing an upper body above the spring unit;
a floating floor construction step of constructing the floating floor above the upper body;
A jack set installation step of installing a jack set on the intermediate plate of the spring unit;
a steel bar removal step of loading the jacks of the jack set and removing the steel bars;
a load-receiving step of unloading the jack , extending the support spring of the spring unit, and supporting the floating floor with the spring unit. construction method. A method for replacing an existing spring unit of an anti-vibration floating floor installed between a lower body and an upper body, comprising:
An existing jack set installation step of installing a jack set on the intermediate plate of the existing spring unit;
a temporary support member installing step of installing a temporary support member on the lower body and supporting the upper body with the temporary support member;
an existing spring unit contracting step of releasing the joint between the upper plate of the existing spring unit and the upper body, loading the jack of the jack set, and contracting the support spring of the existing spring unit; ,
an existing spring unit shrinking and holding step of connecting the lower plate of the existing spring unit and the intermediate plate with a steel bar;
an existing spring unit removing step of removing the existing spring unit;
The new spring unit is installed on the lower body while the support spring of the new spring unit is compressed and the lower plate and intermediate plate of the new spring unit are connected with steel bars. an installation process;
A new jack set installation step of installing a jack set on the intermediate plate of the new spring unit;
a steel bar removal step of loading the jacks of the jack set and removing the steel bars;
a new spring unit extending step of unloading the jack and extending a support spring of the new spring unit;
The lower plate of the new spring unit is fixed to the lower body, the upper plate of the new spring unit is fixed to the upper body, and the jack set and the temporary support member are removed. and a spring unit fixing step.

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