Floating floor structure and construction method of floating floor structure

Abstract

The installation space for the spring member between the concrete slab and the concrete floating floor is reduced. [Solution] The floating floor structure comprises a concrete slab provided inside the building, a concrete floating floor provided on the concrete slab, a plurality of through holes penetrating the concrete floating floor, a spring member housed in the through holes and whose lower end is supported by the concrete slab, and a fixing member that pushes down the upper end of the spring member and fixes it to the concrete floating floor, thereby lifting the concrete floating floor away from the concrete slab by the compressive repulsive force of the spring member.

Description

Technical Field

[0001] The present disclosure relates to a floating floor structure and a construction method of the floating floor structure.

Background Art

[0002] There is a vibration isolation structure of a mechanical parking facility in which a floating floor is provided on a slab via a vibration isolation member, and a mechanical parking facility is provided on the floating floor (for example, Patent Document 1).

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, it is necessary to secure an installation space for a spring member between a concrete slab and a concrete floating floor.

[0005] The present disclosure provides a floating floor structure and a construction method of the floating floor structure in which the installation space for a spring member between a concrete slab and a concrete floating floor is reduced.

Means for Solving the Problems

[0006] The floating floor structure of the first aspect includes a concrete slab provided in a building, a concrete floating floor provided on the concrete slab, a plurality of through holes penetrating the concrete floating floor, a spring member housed in the through holes and supported at a lower end by the concrete slab, and a fixing member that presses down an upper end of the spring member and is fixed to the concrete floating floor, and floats the concrete floating floor from the concrete slab by a compression repulsive force of the spring member.

[0007] In this embodiment, a spring member is housed in a through-hole in the concrete floating floor, and the concrete floating floor is raised from the concrete slab by the compressive rebound force of the spring member, thus reducing the installation space required for arranging the spring member.

[0008] In the second embodiment of the floating floor structure, the spring member is constructed by stacking disc springs, and a cylinder-shaped damper is placed in the hole in the center of the disc spring.

[0009] In this embodiment, the spring member is constructed by stacking disc springs, which allows for a rationalization of construction costs compared to coil springs. Furthermore, by arranging a cylinder-type damper, vertical vibrations of the concrete floating floor can be dampened at an early stage.

[0010] The construction method for the floating floor structure of the third embodiment includes the steps of: laying an edge-cutting sheet on a concrete slab provided inside a building, arranging cylindrical bodies at predetermined intervals on the edge-cutting sheet, and pouring concrete so that the cylindrical bodies become through holes to construct a concrete floating floor; arranging a spring member inside the cylindrical body and attaching a fixing member to the upper part of the spring member; installing a frame on the concrete floating floor, using the frame as a reaction force receiver to push down the fixing member with a jack, applying a compressive rebound force to the spring member, and raising the concrete floating floor away from the concrete slab; and after fixing the fixing member to the concrete floating floor, removing the frame and jack.

[0011] In this embodiment, the installation of the spring member can be performed from above the concrete floating floor, which is easier compared to the conventional method of installing the spring member below the concrete floating floor. Furthermore, the replacement of the spring member can also be performed from above the concrete floating floor. [Effects of the Invention]

[0012] According to this disclosure, the installation space between the concrete slab and the concrete floating floor can be reduced, and a floating floor structure and a construction method for the floating floor structure can be provided that reduce the height dimension. [Brief explanation of the drawing]

[0013] [Figure 1] This is a plan view showing the floating floor structure of this embodiment. [Figure 2] This is a straight cross-sectional view showing the floating floor structure of this embodiment. [Figure 3] This is a cross-sectional view showing the state in which the edge-cutting sheet has been laid on top of the concrete slab during the construction process of the floating floor structure of this embodiment. [Figure 4] This is a cross-sectional view showing the state in which circular steel pipes are placed on a concrete slab during the construction process of the floating floor structure of this embodiment. [Figure 5] This is a cross-sectional view showing the state in which the base is installed on the concrete slab during the construction process of the floating floor structure of this embodiment. [Figure 6] This is a cross-sectional view showing the state in which the main reinforcement and distribution reinforcement constituting the concrete floating floor are placed on the outside of the circular steel pipe during the construction process of the floating floor structure of this embodiment. [Figure 7] This is a cross-sectional view showing the state in which concrete has been poured onto the main reinforcement and distribution reinforcement arranged in Figure 6, as part of the construction process of the floating floor structure of this embodiment. [Figure 8] This is a cross-sectional view showing the state in which the stacked disc springs are installed on the liner plate during the construction process of the floating floor structure of this embodiment. [Figure 9] This is a cross-sectional view showing the state in which a reaction plate is placed on top of the disc spring during the construction process of the floating floor structure of this embodiment. [Figure 10] This is a cross-sectional view showing the state in which the support frame is installed from above on the outside of the circular steel pipe and reaction plate during the construction process of the floating floor structure of this embodiment. [Figure 11] This is a cross-sectional view showing the state in which the jack is installed below the support frame and on the upper surface of the reaction plate during the construction process of the floating floor structure of this embodiment. [Figure 12] This is a cross-sectional view showing the state in which the concrete floating floor is slightly lifted from the edge-cutting sheet due to the compressive rebound force of the spring member during the construction process of the floating floor structure of this embodiment. [Figure 13] This is a cross-sectional view showing the floating bed structure of a comparative example. [Figure 14] It is a front cross-sectional view showing a first modification of the floating floor structure of the present embodiment.

Mode for Carrying Out the Invention

[0014] Hereinafter, an embodiment will be described with reference to the drawings.

[0015] In the figure, the arrow H indicates the upper side (vertically upward) in the vertical direction of the floating floor structure. Therefore, the opposite direction of the arrow H is the lower side (vertically downward) in the vertical direction of the floating floor structure. Also, the arrow D in the figure indicates the rear in the front-rear direction of the floating floor structure. Therefore, the opposite direction of the arrow D is the front in the front-rear direction of the floating floor structure. Further, the arrow W in the figure indicates the right side in the left-right direction of the floating floor structure. Therefore, the opposite direction of the arrow W is the left side in the left-right direction of the floating floor structure. Also, the arrow H, the arrow D, and the arrow W are orthogonal to each other. Since these directions are defined for convenience of explanation, the configuration of the floating floor structure is not limited to these directions.

[0016] <Configuration of the floating floor structure> <清 First, the overall configuration of the floating floor structure 10 will be described.

[0017] As shown in FIG. 1, the floating floor structure 10 is provided inside a building (for example, an event hall, a live hall, etc., not shown), and absorbs vertical vibrations accompanying the movement (for example, walking, jumping, etc.) of the audience (not shown) inside the building. In the present embodiment, the floating floor structure 10 is arranged on the lowest basement floor of the building.

[0018] Note that the floating floor structure 10 is not limited to the lowest basement floor and may be an intermediate floor inside the building.

[0019] The floating floor structure 10 has an outer peripheral body 12 and a movable floor 20. The outer peripheral body 12 is constituted by, for example, columns, beams, and walls. FIG. 2 is a front cross-sectional view of a part of the floating floor structure 10 cut out. In the present embodiment, the outer peripheral body 12 includes a concrete slab 14 provided on the foundation (not shown) of the building. That is, the concrete slab 14 is provided inside the building.

[0020] As shown in Figure 1, the movable floor 20 is a rectangular floor in plan view and is positioned on the outer perimeter structure 12 with a small gap between it and the outer perimeter structure 12 in the front-to-back and left-to-right directions.

[0021] The movable floor 20 is supported by the concrete slab 14 in a front view and is a floating floor that can vibrate vertically relative to the concrete slab 14 at a specific frequency (e.g., 1 Hz).

[0022] Next, the components of the movable floor 20 will be described. The movable floor 20 includes a concrete floating floor 30, a circular steel pipe 40, a mounting member 50, a spring member 60, and a reaction plate 70.

[0023] (Concrete floating floor) The concrete floating floor 30 is a cast-in-place reinforced concrete floor that has thickness in the vertical direction and is aligned in the left-right and front-back directions. In the concrete floating floor 30, the upper surface 30a is the floor surface that supports the spectators from below. The concrete floating floor 30 is installed on top of the concrete slab 14. In this embodiment, the concrete floating floor 30 is installed in a state where it is separated vertically and upward from the edge sealing sheet S on the concrete slab 14.

[0024] As shown in Figure 6, multiple main reinforcement bars 32 and multiple distribution reinforcement bars 34 are arranged inside the concrete floating floor 30. In this embodiment, the multiple main reinforcement bars 32 are arranged spaced apart from each other in the front-to-back direction. In this embodiment, the multiple distribution reinforcement bars 34 extend in the front-to-back direction and are arranged spaced apart from each other in the left-to-right direction.

[0025] (Circular steel pipe) As shown in Figure 2, the circular steel pipe 40 is installed inside the concrete floating floor 30 in an open position in the vertical direction and is a cylindrical steel pipe having a flange portion. Multiple circular steel pipes 40 are provided on the concrete slab 14. The circular steel pipes 40 form through holes 42a, which will be described later, through the concrete floating floor 30, and allow the mounting members 50 and spring members 60, which will be described later, to be housed within. The circular steel pipe 40 is an example of a cylindrical body. In this embodiment, multiple through holes 42a corresponding to the number of circular steel pipes 40 are formed in the concrete floating floor 30.

[0026] Note that the circular steel pipe 40 is not limited to a cylindrical shape; it may also be a rectangular steel pipe.

[0027] As shown in Figure 4, the circular steel pipe 40 has a cylindrical portion 42 and a flange portion 44. The cylindrical portion 42 is a cylindrical body extending in the vertical direction. The inside of the cylindrical portion 42 is a through hole 42a. In addition, multiple headed studs 42b are embedded in the outer surface of the cylindrical portion 42 along the left-right direction.

[0028] The flange portion 44 is formed at the upper end of the cylindrical portion 42 and is a flange that extends along the left-right and front-rear directions. Multiple bolt holes 44b are formed in the flange portion 44, opening downward from the upper surface 44a. Cap nuts 44c are attached to the flange portion 44, positioned vertically below the bolt holes 44b and continuous with the bolt holes 44b. The cap nuts 44c are attached in a position that does not interfere with the headed studs 42b of the cylindrical portion 42. In this embodiment, four bolt holes 44b and four cap nuts 44c are evenly formed in the flange portion 44 (see Figure 1).

[0029] (Mounting components) As shown in Figure 2, the mounting member 50 is installed on the upper surface 14a of the concrete slab 14, inside the circular steel pipe 40, and supports the spring member 60 (described later) from below. The mounting member 50 is an example of a fixing member.

[0030] As shown in Figure 5, the mounting member 50 has a base 52 and a liner plate 54. The base 52 is a box or frame having a predetermined height. The base 52 is placed on the upper surface 14a of the concrete slab 14 and has an outer diameter slightly smaller than the inner diameter of the through hole 42a of the circular steel pipe 40. The liner plate 54 is installed on the base 52 and finely adjusts the support height of the spring member 60. In this embodiment, the liner plate 54 as a whole is formed by stacking multiple plates.

[0031] (Spring component) As shown in Figure 2, the spring member 60 is a member that can be elastically deformed in the vertical direction, and is housed in the through hole 42a of the circular steel pipe 40, with its lower end supported by the concrete slab 14 via the mounting member 50. In this embodiment, as shown in Figure 8, the spring member 60 is composed of multiple identical disc springs 62, each having a hole 62a in the center, stacked vertically. Specifically, the spring member 60 is composed of multiple pairs of disc springs 62 stacked vertically, with one disc spring 62 in an elastically deformable vertical position and another disc spring 62 in an inverted position relative to that position, arranged so that their respective holes 62a overlap in a plan view. The hole 62a is, for example, φ200.

[0032] When a load is applied to the upper end of the spring member 60, it elastically deforms downward in the vertical direction, and when the load is removed from the upper end, the restoring force pushes the load back upward in the vertical direction. In Figure 8, the spring member 60 is at its natural length when no load is applied to the upper end. Also, in Figure 2, the spring member 60 is in a state where the downward load in the vertical direction including the concrete floating floor 30 and the upward restoring force in the vertical direction from the spring member 60 are balanced, resulting in a first length that is shorter than the natural length. In this state, the movable floor 20 is in the equilibrium position. Then, in Figure 12, the spring member 60 is subjected to a downward pressing load in the vertical direction, resulting in a second length that is even shorter than the first length, as shown in Figure 2.

[0033] (Reaction plate) As shown in Figure 1, the reaction plate 70 is circular in shape in plan view and serves as a top cover that covers the circular steel pipe 40 from above. The reaction plate 70 is an example of a fixing member. In this embodiment, the reaction plate 70 covers the circular steel pipe 40 from above and closes the through hole 42a of the cylindrical portion 42 (see Figure 2). The reaction plates 70 are arranged in accordance with the circular steel pipes 40. In this embodiment, 20 reaction plates 70 are arranged to correspond to 20 circular steel pipes 40.

[0034] As shown in Figure 2, the reaction plate 70 is fixed to the concrete floating floor 30 by pressing down the upper end of the spring member 60, and the compressive repulsive force of the spring member 60 lifts the concrete floating floor 30 away from the concrete slab 14. The reaction plate 70 is also fixed to the circular steel pipe 40 while positioned on top of it. In this embodiment, as shown in Figure 12, the reaction plate 70 is fixed to the cap nut 44c of the circular steel pipe 40 with a one-side bolt 76. As shown in Figure 9, the reaction plate 70 has a plate portion 72 and a pressing portion 74.

[0035] The plate portion 72 is disc-shaped and oriented in the left-right and front-back directions. The plate portion 72 has an outer diameter equal to or slightly smaller than that of the flange portion 44 of the circular steel pipe 40. Bolt holes 72c are formed in the plate portion 72, extending through in the thickness direction from the upper surface 72a to the lower surface 72b, radially inward from the outer edge. The bolt holes 72c are formed to overlap with the bolt holes 44b of the flange portion 44 in a plan view.

[0036] The retaining portion 74 is a circular member in a bottom view, having an outer diameter slightly smaller than the inner diameter of the through hole 42a of the cylindrical portion 42 in the circular steel pipe 40. The retaining portion 74 is formed in the center of the plate portion 72 so as to protrude downward in the vertical direction from the lower surface 72b of the plate portion 72, and presses down on the upper end of the spring member 60. In this embodiment, the retaining portion 74 is formed integrally with the plate portion 72.

[0037] As a result, the movable floor 20 is configured to vibrate in the vertical direction.

[0038] <Construction method for floating floor structures> Next, we will explain the construction method for the floating floor structure 10.

[0039] The construction uses a jack J and a support frame 80. The jack J is extendable and retractable in the vertical direction, and a load is applied to the spring member 60 using hydraulics. As shown in Figure 11, the support frame 80 has a gate-shaped cross section when viewed from the front, and has a receiving portion 82 as a reaction force receiver that receives one end of the jack J at its lower surface 82a, and a leg portion 84 that extends downward from the receiving portion 82 and can adhere to the upper surface 30a of the concrete floating floor 30 at its lower surface 84a.

[0040] As shown in Figure 3, an edge-cutting sheet S is laid on top of the concrete slab 14 of the outer frame 12. When laying the edge-cutting sheet S, in this embodiment, holes are made in the edge-cutting sheet S in the areas where the circular steel pipe 40 is to be placed, exposing the upper surface 14a of the concrete slab 14.

[0041] Furthermore, the material of the edge-cutting sheet S is not limited as long as it is configured to separate the concrete floating floor 30, which is cast in place, from the concrete slab 14.

[0042] As shown in Figures 1 and 4, circular steel pipes 40 are placed at equal intervals on a concrete slab 14 with its upper surface 14a exposed. Equal intervals are just one example of predetermined intervals. When placing the pipes, the circular steel pipes 40 are positioned with the cylindrical portion 42 facing downwards and the flange portion 44 facing upwards.

[0043] As shown in Figure 5, the mounting member 50 is placed inside the through hole 42a of the cylindrical portion 42. When placing the members, the base 52 and the liner plate 54 are placed on the concrete slab 14 in that order.

[0044] As shown in Figure 6, the main reinforcement bars 32 and distribution reinforcement bars 34 are placed. When placing the reinforcement bars, they are also placed in the headed studs 42b of the circular steel pipe 40.

[0045] Next, concrete is poured onto the outside of the circular steel pipe 40 from the top surface of the edge-cutting sheet S to a predetermined height. Once the concrete hardens, the concrete floating floor 30 shown in Figure 7 is constructed. When pouring the concrete, a jig (not shown) may be used to ensure that the top surface 30a of the concrete floating floor 30 is positioned above the top surface 44a of the circular steel pipe 40 after pouring.

[0046] Next, as shown in Figure 8, the spring member 60 is placed on the liner plate 54 of the mounting member 50 inside the circular steel pipe 40. When placing it, it is preferable to stack the disc springs 62 together in advance in a separate process.

[0047] Next, as shown in Figure 9, the reaction plate 70 is placed on top of the spring member 60. When placing it, the reaction plate 70 is positioned so that the pressing portion 74 is located downwards and the plate portion 72 is located upwards, and the pressing portion 74 is located inside the through hole 42a.

[0048] Next, as shown in Figure 10, the support frame 80 is installed on the concrete floating floor 30 so as to cover the reaction plate 70 from above.

[0049] Next, as shown in Figure 11, the jack J is placed on the upper surface 72a of the plate portion 72 of the reaction plate 70.

[0050] Subsequently, the jack J is extended vertically so that its upper end pivots on the lower surface 82a of the receiving portion 82, applying a pressing load (preload) to the spring member 60, pushing down the reaction plate 70, and applying a compressive rebound force to the spring member 60, thereby inserting the one-side bolt 76 into the cap nut 44c. As a result of inserting the one-side bolt 76 into the cap nut 44c, the concrete floating floor 30 is slightly lifted from the concrete slab, resulting in the state shown in Figure 12.

[0051] After fixing the reaction plate 70 to the concrete floating floor, the support frame 80 and jack J are removed. Once the vertical vibrations associated with the removal have stopped, the movable floor 20 will come to rest in the equilibrium position, as shown in Figure 2.

[0052] Based on the above, the floating floor structure 10 is constructed.

[0053] <Effects and Effects> Next, the effects and advantages of the floating floor structure 10 of this embodiment will be explained with reference to comparative examples.

[0054] In the comparative floating floor structure, as shown in Figure 13, a coil spring 960 is placed between the movable floor 920 and the concrete slab 914, and the coil spring 960 absorbs the vertical load of the movable floor 920. The lower surface 960b of the coil spring 960 is in contact with the upper surface 914a of the concrete slab 914, and the upper surface 960a is in contact with the lower surface of the movable floor 920.

[0055] In this configuration, when the weight of the movable floor 920 and the restoring force of the coil spring 960 are balanced, that is, at the equilibrium position, the height from the top surface 914a of the concrete slab 914 to the top surface 920a of the movable floor 920 is h2 (for example, approximately 3,000 mm).

[0056] In the comparative example, a relatively large pit space with a height of h2 is required beneath the movable floor 920. Therefore, it is conceivable that there may be cases where it is necessary to change the floor height of the building, such as when rooms are planned on the lower floor.

[0057] Furthermore, in the comparative example, it is necessary to enter the pit beneath the movable floor 920 during maintenance and inspection.

[0058] On the other hand, the floating floor structure 10 of this embodiment includes a concrete slab 14 provided on the outer frame 12 inside the building and a movable floor 20. The movable floor 20 also includes a concrete floating floor 30 provided on the concrete slab 14, a plurality of through holes 42a penetrating the concrete floating floor 30, a spring member 60 housed in the through holes 42a and whose lower end is supported by the concrete slab 14 via a mounting member 50, and a reaction plate 70 that pushes down the upper end of the spring member 60 and fixes it to the concrete floating floor 30, and the compressive repulsive force of the spring member 60 lifts the concrete floating floor 30 away from the concrete slab 14.

[0059] According to this configuration, the spring member 60 is housed in the through hole 42a of the concrete floating floor 30, and the compressive repulsive force of the spring member 60 lifts the concrete floating floor 30 away from the concrete slab 14. Therefore, compared to the comparative example, the space required for the spring member 60 to be placed between the concrete slab 14 and the concrete floating floor 30 is reduced, and the height dimension of the movable floor 20 as a floating floor is reduced.

[0060] For example, as shown in Figure 2, the height h1 (e.g., 1,200 mm) from the top surface 14a of the concrete slab 14 to the top surface 30a of the movable floor 20 is smaller than the height h2 of the comparative example. In other words, by adopting the configuration of this embodiment, the required dimensions of the movable floor 20 as a floating floor are minimized compared to the comparative example.

[0061] Furthermore, the movable floor 20 of the floating floor structure 10 is constructed by stacking disc springs 62 as the spring member 60.

[0062] According to this configuration, the spring member 60 is constructed by stacking disc springs 62, which allows for rationalization of construction costs compared to coil springs. Furthermore, the spring member 60 becomes more compact in directions that intersect with the direction of elastic deformation (up and down) (left and right and front and back directions). Moreover, by using disc springs 62 as the spring member 60, the design flexibility is increased in terms of the ratio of height to plate thickness of the disc springs 62, the way they are stacked, etc.

[0063] Furthermore, the construction method for the floating floor structure 10 includes the steps of: laying an edge-cutting sheet S on a concrete slab 14 provided on the outer perimeter frame 12 inside the building, arranging circular steel pipes 40 at predetermined intervals on the edge-cutting sheet S, and pouring concrete so that the cylindrical portion 42 of the circular steel pipes 40 becomes a through-hole 42a to construct a concrete floating floor 30; placing a spring member 60 inside the through-hole 42a and attaching a reaction plate 70 to the upper part of the spring member 60; installing a frame 80 on the concrete floating floor 30, using the frame 80 as a reaction force receiver and pushing down the reaction plate 70 with a jack J to apply a compressive rebound force to the spring member 60, thereby lifting the concrete floating floor 30 away from the concrete slab 14 and the edge-cutting sheet S; and after fixing the reaction plate 70 to the concrete floating floor 30, removing the frame 80 and the jack J.

[0064] According to this construction method, the spring member 60 can be installed from above the concrete floating floor 30, which is easier than installing the spring member 60 below the concrete floating floor 30, as in the comparative example. Furthermore, maintenance and inspection, including replacement of the spring member 60, can also be performed from above the concrete floating floor 30.

[0065] <Variation> Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to this embodiment, and the embodiment and various modifications may be used in appropriate combinations, and of course, it can be implemented in various ways without departing from the gist of the present disclosure.

[0066] For example, the following variations can be taken.

[0067] (First variation) A first modified example will now be described. The first modified example has the same basic configuration as the above embodiment, but differs from the above embodiment in that it has a damper 180.

[0068] Note that reference numerals and descriptions may be omitted for components and functions common to the above embodiments.

[0069] As shown in Figure 14, in the first modified floating floor structure, the movable floor 120 has a damper 180 positioned on the base 52 of the mounting member 50 and inside the hole 62a of the spring member 60. The damper 180 is cylindrical and expandable and contractible in the vertical direction. When a vertical load is applied to the concrete floating floor 30, the damper 180 contacts the pressing portion 74 of the reaction plate 70, thereby damping the vertical vibration of the spring member 60. In the first modified example, the damper 180 is, for example, an oil damper.

[0070] In other words, in the movable floor 120 of the floating floor structure according to the first modified example, a cylindrical damper 180 is placed in the hole 62a in the center of the disc spring 62.

[0071] According to this configuration, by arranging the cylinder-shaped damper 180, vertical vibrations of the concrete floating floor 30 can be dampened at an early stage.

[0072] (Other variations) In the above embodiment, the circular steel pipe 40 is placed on the concrete slab 14 with its upper surface 14a exposed through the holes in the edge-cutting sheet S, but the embodiment is not limited to this. Alternatively, the edge-cutting sheet S may be laid without gaps on the concrete slab 14, and the circular steel pipe 40 may be placed on the edge-cutting sheet S. In this case, it is preferable that the edge-cutting sheet S is easily sheared when the concrete floating floor 30 is lifted from the concrete slab 14.

[0073] In the above embodiment, the circular steel pipes 40 are arranged at equal intervals on the concrete slab 14, but the embodiment is not limited to this. For example, the circular steel pipes 40 may be arranged at unequal pitches on the concrete slab 14. In this case, the pitch is preferably determined according to the expected load location.

[0074] In the above embodiment, the spring member 60 is configured by stacking multiple identical disc springs 62 in the vertical direction, but it is not limited to this. For example, the spring member 60 may be configured by stacking multiple disc springs 62 with different spring constants in the vertical direction. Also, the spring member 60 is not limited to disc springs. For example, the spring member 60 may be a coil spring. In this case, it is preferable that multiple coil springs are arranged and installed on the mounting member 50. Compared to a configuration in which only one coil spring is installed on the mounting member 50, it is possible to suppress the tilt in the vertical direction due to the elastic deformation of the coil spring.

[0075] In the above embodiment, four bolt holes 44b and cap nuts 44c are formed in the flange portion 44, but this is not limited to this. For example, three or fewer, or five or more may be formed.

[0076] In the above embodiment, the mounting member 50 is provided with a liner plate 54, but it is not limited to this. For example, the mounting member 50 may consist only of a base 52.

[0077] In the above embodiment, the jack J is extended vertically to apply a pressing load (preload) to the spring member 60 at the site where the building is installed, but this disclosure is not limited to this. For example, the spring member 60 may be stored in the through hole 42a in a pre-loaded state (compressed to its natural length), the reaction plate 70 as an upper cover may be fixed, and then the preload may be released. [Explanation of symbols]

[0078] 10 Floating floor structure 12 Peripheral frame 14 Concrete slab 14a Top side 20 Movable floor 30 Concrete floating floor 30a top surface 32 Main reinforcement 34. Muscles that distribute force 40 circular steel pipes 42 Cylindrical section 42a through hole 42b stud 44 Flange section 44a Top 44b Bolt holes 44c cap nuts 50 Mounting components (examples of fixing components) 52 base 54 Liner Plate 60 Spring component 62 Disc springs 62a Hole 70 Reaction plate (an example of a fixing member) 72 Plate section 72a Top side 72b Bottom side 72c bolt holes 74 Pressing part 76 One-sided bolt 80 mounting bases 82 Receiving part 82a Bottom surface 84 Legs 84a Bottom side 120 Movable floor 180 Damper 914 Concrete slab 914a top side 920 Movable floor 920a top side 960 Coil Spring 960a top side 960b Bottom side J Jack S Edge-cutting sheet

Claims

1. A concrete slab installed inside the building, A concrete floating floor is provided on the aforementioned concrete slab, Multiple through holes penetrating the aforementioned concrete floating floor, A spring member housed in the through-hole and with its lower end supported by the concrete slab, A floating floor structure comprising a fixing member that presses down the upper end of the spring member and fixes it to the floating concrete floor, and the compressive repulsive force of the spring member lifts the floating concrete floor away from the concrete slab.

2. The spring member is constructed by stacking disc springs, A cylinder-shaped damper is positioned in the hole in the center of the aforementioned disc spring. The floating bed structure according to claim 1.

3. The process involves laying an edge-cutting sheet on a concrete slab installed inside the building, arranging cylindrical bodies at predetermined intervals on the edge-cutting sheet, and pouring concrete so that the cylindrical bodies become through holes to construct a concrete floating floor, The steps include: placing a spring member inside the cylindrical body and attaching a fixing member to the upper part of the spring member; The process involves installing a support frame on the aforementioned floating concrete floor, using the support frame as a reaction force receiver to push down the fixing member with a jack, and applying a compressive rebound force to the spring member, thereby lifting the floating concrete floor away from the concrete slab. After fixing the aforementioned fixing member to the concrete floating floor, the process of removing the support frame and jacks, A method for constructing a floating floor structure having the following characteristics.

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