JP3810870B2 - Concrete slab embedding material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete slab embedding material in a hollow slab method for constructing a floor or ceiling of a building.
[0002]
[Prior art]
The hollow slab method of transporting a thin PC board produced in the factory in advance to the site, placing concrete with foamed plastic embedded material on the thin PC board, and building the floor and ceiling of the building, In recent years, slabs such as building floors can be reduced in weight and have advantages such as saving labor. The embedding material used in this hollow slab method is generally a foamed plastic frame or block.
[0003]
[Problems to be solved by the invention]
However, in a hollow slab in which a conventional embedding material is embedded, even if high-frequency sound insulation is sufficient, low-frequency sound insulation and vibration are insufficient. For example, in an apartment house where a floor is constructed with a hollow slab, when a child jumps upstairs and gives vibration to the floor, this vibration is almost directly transmitted downstairs, which may cause a noise problem. That is, in the conventional hollow slab in which the embedding material is embedded, the function of damping the vibration cannot be expected.
[0004]
Then, in view of the fault of the above-mentioned conventional hollow slab, an object of this invention is to provide the embedding material for concrete slabs which can attenuate a vibration.
[0005]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and according to the first aspect of the present invention, there is provided a concrete slab which is disposed on a thin-walled PC board and is casted in place and embedded in the concrete. For embedding materials,
The embedding material includes a weight,
A weight storage space for storing the weight at least with a relatively vertical movement range; and
An elastic support for supporting the weight in the weight housing empty portion in an elastic state;
It is provided with.
[0006]
When vibration is applied to the concrete slab in which the embedding material is embedded to move in the vertical direction, the inertial force of the weight acts in the direction opposite to the moving direction of the slab to cancel the vibration. Therefore, vibration of the slab can be suppressed.
[0007]
In addition to the structure of claim 1, the invention according to claim 2 forms a molding cavity that has an upper surface opened and the deepest part stopped halfway without reaching the thin PC plate, and is formed in the molding cavity. It is characterized in that the cast-in-place concrete enters and a concrete hanging part is formed.
[0008]
Therefore, the resonance characteristics of the concrete slab can be changed depending on the length of the concrete-like hanging portion.
[0009]
According to a third aspect of the present invention, a foamed plastic loading frame member having a loading hole whose top and bottom are open, and a foamed plastic case that can be fitted in the loading hole,
A concrete slab embedding material characterized in that the case is separable, has a weight storage space formed therein, and a portion constituting the bottom of the weight storage space is an elastic support. .
[0010]
What is described in claim 4 is a columnar concrete in which the weight is molded to a predetermined dimension,
An embedding material for concrete slabs characterized in that the weight housing space is a horizontally-oriented substantially cylindrical space capable of housing the weight.
[0011]
If the weight housing empty part is set to a size that can accommodate the test piece used for the concrete strength test, the test piece that has been discarded so far can be used as the weight.
[0012]
According to a fifth aspect of the present invention, there is provided an embedding material for concrete slab characterized in that an auxiliary elastic material is provided at the bottom of the weight housing space.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The embedding material 1 shown in the drawing is mainly composed of a loading frame member 3 having a plurality of loading holes 2 that are open at the top, bottom, a case 4 that can be fitted in the loading hole 2, and a weight 5 that is housed inside the case 4. It is an important member.
[0014]
As shown in FIG. 1, the loading frame member 3 is a frame made of foamed plastic (for example, foamed polystyrene) having a long side length of 1200 mm, a short side length of 430 mm, and a thickness of 125 mm in this embodiment. It is a molded body, and a plurality of loading holes 2 having a length of 360 mm, a width of 120 mm, and a depth of 125 mm that are open at the top and bottom are opened in parallel with the short sides (total of 8 places).
Then, on the outer periphery of the loading frame member 3 and the partition wall 6 of each loading hole 2, as shown in FIG. 2, a taper that is thick from the upper edge to the lower edge is formed as a die-cutting gradient, and in the vicinity of the lower edge. Is formed with a flange portion 7 in the same inclination direction as the taper. As will be described later, the flange portion 7 is a portion that functions as a fastening portion by being buried in uncured concrete when the embedding material 1 is placed on the upper surface thereof after pouring the concrete of a thin PC plate. Moreover, as shown in FIG.1 and FIG.3, the notch part 8 which becomes a series and the shaping | molding empty part of the case 4 mentioned later is formed in the upper end edge of the partition wall 6. As shown in FIG.1 and FIG.3.
In addition, although the foaming rate of this loading frame material 3 is about 30 times in this embodiment, it can be set appropriately.
[0015]
In the present embodiment, the case 4 to be loaded into the loading hole 2 of the above-described loading frame member 3 has a length of 350 mm, a width of 120 mm, and a height of 120 mm, corresponding to the dimensions of the loading hole 2 described above. It is a substantially rectangular parallelepiped made of foamed plastic (for example, expanded polystyrene), and as shown in FIG. 4, it is possible to divide in the horizontal direction from the center line by setting a dividing surface in the vertical direction along the substantially central line in the longitudinal direction. is there. As shown in FIGS. 4 and 5, a substantially cylindrical weight storage cavity 10 is formed in the inside in a united state, and the axial direction is lateral, and the bottom of the weight storage cavity 10 having a substantially arc curved surface is formed. The part which comprises is made into the elastic support part 11, and the auxiliary | assistant weight storage empty parts 12 and 12 which can be used for weight weight adjustment are formed in the front and back of the weight storage empty part 10 across the wall. In addition, the outside of the cylindrical part constituting the weight storage cavity 10 is a hollow part, and the upper surface connected to the upper end of the cylindrical part and the lower surface connected to the lower end of the cylindrical part have thicknesses, respectively. A 10 mm upper surface portion 15 and a lower surface portion 16 are integrally formed, and 15 mm thick reinforcing ribs 17 connecting the upper surface portion 15 and the lower surface portion 16 are integrally formed at intervals of 40 mm in the vertical direction. A locking claw portion 18 is formed as a drop prevention portion at the lower portion of the plate.
[0016]
Further, in this case 4, a part of the upper surface part 15 is omitted and communicated with the lightening empty part, thereby forming a forming empty part 19 having an open upper surface. As shown in FIGS. 4 and 6, the molding hollow portion 19 has a cylindrical portion that bulges outward in an arcuate curved surface, and therefore the deepest portion where the concrete cannot flow is approximately the center of the height, that is, a thin wall Without reaching the PC plate, it stops halfway (in the present embodiment, at a position of about 60 mm, which is substantially the center of the height).
The expansion rate of the case 4 is about 30 times as in the case of the loading frame member 3 in the present embodiment, but can be set as appropriate.
[0017]
The weight 5 housed in the weight housing space 10 of the case 4 may be made of metal, but in this embodiment, columnar concrete is used. This columnar concrete is formed into a predetermined size. For example, a test piece used for a concrete strength test is standardized in size and shape. For example, the test piece is defined to have a diameter of 100 mm and a height of 200 mm. The weight of this test piece is about 3.8 kg.
[0018]
In order to use this test piece as the weight 5, the dimensions of the weight receiving space 10 are a cylindrical shape having a substantially circular cross section with an axial dimension of 212 mm and a diameter of 102 mm. In addition, by setting the diameter of the weight storage space 10 to be larger than the diameter of the weight 5, when the test piece as the weight 5 is stored in the weight storage space 10, at least the relative vertical movement range is set. It is configured so that 2 mm can be stored.
[0019]
It should be noted that the weight housing empty portion 10 for housing the weight 5 may have any shape as long as the weight 5 can ensure a moving range in the relative vertical direction, for example, an elliptical or elliptical shape having a long diameter on the top and bottom and a short diameter on the left and right. Good. Further, in the embodiment of the drawings, the portion made of expanded polystyrene constituting the bottom of the weight housing cavity 10 is used as the elastic support portion 11, but a soft elastic sheet material (not shown) is formed on the bottom by increasing the expansion ratio. May be laid on the bottom as an auxiliary elastic material. Furthermore, the elastic support portion 11 that elastically supports the weight 5 may be provided separately from the case 4. In short, a spring may be provided as the elastic support portion 11 as long as the weight 5 can be elastically supported.
[0020]
Next, a method for manufacturing a concrete slab substrate using the embedding material 1 having the above-described configuration and construction on site will be described.
As shown in FIG. 7, after reinforcing bars 22 are placed in a mold 21, concrete is placed in the mold 21 to form a thin PC plate 23. And before this concrete hardens, the above-mentioned loading frame material 3 of the embedding material 1 is arranged at a predetermined interval, and the flange portion 7 formed at the lower end is buried in the concrete by about 5 mm and the flange portion 7 is made of concrete. cover. When cured in this state, the hardened concrete restrains the flange portion 7, so that the embedding material 1 is integrated with the thin PC plate 23 and does not come off without using a separate fastener.
[0021]
When the curing is completed, the case 4 is fitted into the loading hole 2 of the loading frame member 3 in a state where the weight 5 is housed in the weight housing space 10 of the case 4. When the case 4 is fitted in this manner, the locking claws 18 formed on the outer surface of the reinforcing rib 17 bite into the inner surface of the loading hole 2, so that the case 4 is difficult to come off.
Note that the case 4 may be loaded in all of the loading holes 2, or only a part of the loading holes 2 may be loaded.
Further, the loading operation of the case 4 may be performed on site.
[0022]
Next, the concrete slab substrate 30 manufactured as described above is transported to the site and laid on a pre-assembled support (not shown). Then, after making adjustments such as horizontal adjustment and arranging the upper end reinforcement 31, the post-cast concrete 32 is placed. In addition, even if the worker walks on the embedded material 1 of the substrate 30 laid by the work such as arranging the upper end bars 31, the wall surface constituting the weight housing space 10 is formed into a cylindrical shape, that is, Not only is the monocoque shape configured to disperse the load of the operator, but also the reinforcing rib 17 is formed to ensure sufficient strength, so that the embedment 1 is damaged even if a pedestrian gets on it. There is nothing.
[0023]
The post-cast concrete 32 is not only placed within the interval of the embedding material 1, but also covers all of the embedding material 1 to a predetermined thickness, so that the concrete covering the embedding material 1 is opened on the upper surface as described above. Then, as shown in FIG. 6, the inverted hollow-shaped hanging portion 35 is formed which is filled in the forming hollow portion 19 and stops midway without reaching the thin PC plate 23. The drooping portion 35 forms a so-called hunched stiffening rib.
Then, when the placement of the post-cast concrete 32 is finished, it is cured until the predetermined strength is reached with the support structure being in place, and when it is cured, the support work is removed and the construction of the hollow slab is finished.
[0024]
The hollow slab 36 constructed in this way has a weight when, for example, a child jumps and vibrates after the building is completed, that is, when the slab tries to move up and down due to vertical vibration. The movement is suppressed by the inertial force of 5. That is, since the weight 5 is supported in an elastic state by the elastic support portion 11 made of expanded polystyrene, in other words, since the weight 5 is floated by the elastic support portion 11 (floating state), the slab is moved up and down. Even if it tries to move in the direction, the movement can be suppressed by the inertial force of the weight 5 or can be attenuated by the vibration of the opposite phase, based on the same principle as the dynamic damper. Even if the weight 5 and the case 4 change relative to each other due to the expansion and contraction of the elastic support portion 11, there is no problem because the moving range remains in the weight housing space 10.
[0025]
Therefore, in the hollow slab 36 using the embedding material according to the present invention, vibration applied from the upper floor is less likely to be transmitted to the lower floor as compared with the conventional hollow slab.
Similarly, low-frequency sound can be canceled or attenuated by the inertial force of the weight 5.
Further, in the present embodiment, each case 4 is formed with a hanging portion 35, and the hanging portion 35 can change the vibration characteristics of the concrete hollow slab 36 according to the difference in length and position, thereby The occurrence of a resonance phenomenon can be suppressed.
[0026]
In addition, it is necessary to connect electric piping, water and sewage piping, etc. to the concrete hollow slab. For such piping, for example, as shown in FIG. Is prepared, a thick tube can be passed vertically through the loading hole 2 '. Further, the dimension of the case 4 is set to be shorter than the length of the loading hole 2 so as to leave the pipe empty portion 40 on one side in the loading hole 2, and the pipe empty portion 40 side of the partition wall 6 of the loading frame member 3. If a pipe cutout 41 is formed at the upper end of the pipe, electric pipes and the like can be passed through the pipe empty space 40 in the loading hole 2 and the pipe cutout 41 in the partition wall 6. Further, the pipe does not interfere with the truss bars protruding from the concrete substrate 30. In addition, as shown in the drawing, not all the partition walls 6 are formed with notches, but the partition walls 6 that do not have notches are left and used as needed, that is, in places where it is necessary to pass piping. Only in such a case, a necessary portion of the partition wall 6 may be cut at the site to form a notch and pipe. In this way, it is easy to ensure the strength of the loading frame member 3.
[0027]
And as shown in FIG. 10, you may comprise so that the piping empty part 40 may be provided in the both sides of the loading hole 2, and piping may be penetrated in both the piping empty parts 40 and 40. As shown in FIG.
[0028]
In the case 4 described above, the dividing surface is set to the same center in the vertical direction and is divided in the horizontal direction. However, the dividing surface is removed from the center to form a stepped surface, that is, the upper end portion of the crack of one case 4 The other split part of the case 4 that extends to the front side from the center, and the lower end part of the split of the case 4 extends to the front side from the center. It is also possible to make the crack part protrude from the center so that the weight can be removed from the bottom matching part of the weight housing empty part.
Further, the dividing plane may be set in the horizontal direction so that it can be divided vertically. If comprised in this way, a lower case can be integrally molded with the loading frame material 3, and a number of parts can be reduced. The weight 5 housed in the case 4 is not limited to concrete but may be made of metal or the like.
[0029]
【The invention's effect】
As described above, the present invention has the following effects.
According to the first aspect of the present invention, the weight, the weight storage space for storing the weight with at least a relatively vertical movement range, and the elastic support portion for supporting the weight in the weight storage space in an elastic state. Since the concrete slab embedding material is configured, when vibration is applied to the slab, the vibration of the slab can be canceled or attenuated by the inertial force of the weight. Therefore, compared with the conventional hollow slab, it is possible to improve the vibration proof property, to reduce the weight, and to easily construct a slab that is strong against vibration and quiet.
[0030]
According to the second aspect of the present invention, a forming empty portion is formed in which the upper surface is open and the deepest portion stops midway without reaching the thin PC plate, and the cast-in-place concrete enters the forming empty portion, and the concrete is suspended. Since the slab portion is formed, the vibration characteristics of the concrete slab can be changed by adding the hunch-like stiffening rib to the concrete slab, and the resonance phenomenon can be made difficult to occur. Therefore, a quieter slab can be constructed.
[0031]
According to the invention of claim 3, it is provided with a foamed plastic loading frame member having a loading hole that is open at the top and bottom, and a foamed plastic case that can be fitted into the loading hole. Since the weight storage cavity is formed, and the part that constitutes the bottom of the weight storage cavity is an elastic support part, it is possible to easily mass-produce concrete slab embedding material that is resistant to vibration and provide it at low cost can do.
[0032]
According to the invention of claim 4, the weight is columnar concrete formed to a predetermined size, and the weight storage space is a horizontally-oriented substantially cylindrical space that can store the weight. In this case, the work can be performed without being restricted in the direction of the weight. Therefore, work efficiency can be increased. If the weight is cylindrical, the weight can be easily manufactured, and weights with different weights can be easily obtained.
If the shape and dimensions of the weight storage cavity correspond to the dimensions of the test piece used for the strength test, it is possible to use what was previously disposed of as non-combustible material and effectively use resources. Can contribute to environmental protection.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a loading frame member having an upper surface on the left half and a bottom surface on the right half.
FIG. 2 is an enlarged cross-sectional view of a partition wall of a loading frame member.
FIG. 3 is a front view of a notch formed in a partition wall.
FIG. 4 is a perspective view of the case in an exploded state.
FIG. 5 is an explanatory diagram of a case showing an outer surface on the left half and an inner mating surface on the right half.
FIG. 6 is a cross-sectional view of a mold half of a weight housing cavity and a molding cavity.
FIG. 7 is a partially cutaway cross-sectional view showing a manufacturing state of a concrete slab substrate.
FIG. 8 is a cross-sectional view of a hollow slab with post-cast concrete.
FIG. 9 is a perspective view of another embodiment of an embedding material in which an empty pipe portion is provided on one side of a loading hole.
FIG. 10 is a perspective view of another embodiment of an embedding material in which an empty pipe portion is provided on both sides of a loading hole.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Embedding material 2 Loading hole 3 Loading frame material 4 Case 5 Weight 6 Partition wall 7 Eaves part 8 Notch part 10 Weight storage empty part 11 Elastic support part 12 Auxiliary weight storage empty part 15 Upper surface part 16 Lower surface part 17 Reinforcement rib 18 Locking Claw part 19 Forming empty part 21 Formwork 22 Reinforcing bar 23 Thin PC board 30 Concrete slab substrate 31 Top bar 32 Post-cast concrete 35 Suspended part 36 Hollow slab 40 Piping empty part 41 Piping notch

Claims (5)

In the concrete slab embedding material, which is placed on a thin PC board and is cast in-place concrete and embedded in the concrete,
The embedding material includes a weight,
A weight storage space for storing the weight at least with a relatively vertical movement range; and
An elastic support for supporting the weight in the weight housing empty portion in an elastic state;
A concrete slab embedding material characterized by comprising: Formed empty space where the upper surface was opened and the deepest part stopped halfway without reaching the thin PC plate, and cast-in-place concrete entered into the formed empty space to form a concrete hanging part The embedding material for concrete slabs according to claim 1. A foamed plastic loading frame material having loading holes opened at the top and bottom, and a foamed plastic case that can be fitted into the loading hole,
3. The case according to claim 1, wherein the case is separable, and a weight storage space is formed therein, and a part constituting the bottom of the weight storage space is an elastic support. For concrete slabs. The weight is a columnar concrete formed to a predetermined dimension,
The embedding material for concrete slabs according to any one of claims 1 to 3, wherein the weight housing space is a laterally substantially cylindrical space capable of housing the weight. The embedding material for concrete slabs according to any one of claims 1 to 4, wherein an auxiliary elastic material is provided at the bottom of the weight housing empty portion.

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