JP3641664B2 - Slab embedding material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slab embedding material for constructing a void slab by embedding the concrete into the concrete when constructing the slab.
[0002]
[Prior art]
The ceiling surface of a reinforced concrete apartment building is generally formed of a slab with a thickness of about 150 mm, and the load is generally transmitted to a large beam through a small beam protruding below the slab.
[0003]
However, recently, the layout of apartment houses has become wide, and there is a high demand for building a slab with a large span.
In this case, it is necessary to reinforce the slab. However, even if an attempt is made to reinforce the slab by enlarging the beam, the indoor space becomes narrower, so the size is limited.
For this reason, a void pipe slab in which a hollow pipe that becomes a void (void) or a foamed resin material is embedded in concrete to form a slab has attracted attention.
[0004]
This void slab has a slab thickness of 270 to 300 mm, which is thicker than conventional slabs, and the slab is lightened by hollowing the center of the cross section of the slab and embedding lightweight non-concrete materials such as foamed resin. However, it is possible to construct a long span flat slab.
And in order to construct this void slab, the present inventor fixed the foamed resin embedding material that becomes a void in a state of floating from the lower frame, and then put concrete into the construction method and uses it Proposed an embedding material (Japanese Patent Application No. 11-177461).
[0005]
FIG. 7 shows the embedding material 31, which is formed of, for example, a thick plate-like foamed resin material having a width of 700 mm × length of 1200 mm × thickness of 100 mm, and its bottom surface 32 is equipped with a fixing support shaft 40. Except for the flat portion 34 in which the mounting hole 33 to be formed is formed, the concrete formed by the arc surface 35 projecting downward along the width direction and placed on the bottom surface 32 side on the center line extending in the longitudinal direction is formed. A guide hole 36 having a width of about 100 mm and a length of about 200 mm led to the upper surface side is formed so as to penetrate vertically.
[0006]
Then, as shown in FIG. 8, the fixing support shaft 40 erected on the ceiling material 42 which is the lower frame of the slab 41 is inserted into the mounting hole 33 of the embedding material 31 to fix the embedding material 31. It is placed on a spacer flange 43 provided on the support shaft 40.
Next, if a binding flange 44 for pressing the upper surface of the embedding material 31 is attached to the upper end of the fixing support shaft 40, the upper and lower surfaces of the embedding material 31 are sandwiched between the ledges 43 and 44 of the fixing support shaft 40. Thus, it is fixed in a state of floating from the ceiling material 42.
[0007]
Then, after placing and arranging the embedded material 31 in the longitudinal direction, if concrete is placed, the embedded material 31 does not dance or undulate, and a homogeneous void slab is constructed with a single placement. can do.
[0008]
[Problems to be solved by the invention]
By the way, the slab, which is the ceiling of the top floor of a concrete building, is formed in a roof shape that gently slopes from the central part toward both ends because the drainage gradient is formed, and the central part Is thicker than both ends.
[0009]
When the slab embedding material with a uniform thickness is embedded in the concrete of such a slab, the concrete thickness on the lower end side becomes uniform, but the concrete thickness on the upper end side becomes thicker in the center, It is not possible to reduce the weight sufficiently.
[0010]
When using a slab embedding material that gradually changes in thickness, the concrete thickness can be made uniform on both the bottom and top sides, but the slab embedding material of different thickness can be lifted off the bottom frame. There are also several types of fixing shafts for fixing in a fixed state, depending on the thickness, and at least three types of fixing shafts having different lengths from those for thin wall, medium wall, and thick wall.
[0011]
Since this fixing shaft is set up before placing the slab embedding material, it is necessary to rely on the design drawing to determine which length of the fixing shaft is set up. It cannot be directly compared with the thickness of the slab embedding material installed in
As a result, there is a possibility that the fixing shaft for thick wall is erroneously attached to the thin portions on both ends of the slab, or the thin fixing shaft is attached to the thick portion at the center of the slab.
[0012]
In such a case, the fixing shaft for the thick wall is too long and the fixing shaft for the thin wall is too short, so you will notice an error when installing the slab embedding material, but withdraw the slab embedding material. The fixing support shaft can only be removed after that, so that the correction work is cumbersome and the work time is lost accordingly.
[0013]
Therefore, the present invention is technically capable of fixing the slab embedding material having different thicknesses to the lower frame with a single type of fixing shaft, thereby eliminating the loss of working time due to the attachment of the fixing shaft. It is an issue.
[0014]
[Means for Solving the Problems]
In order to solve this problem, the present invention is a slab embedding material embedded in concrete when placing concrete to construct a slab, and is erected on a lower frame that molds the slab. The main body is fixed to a state where it is floated from the lower frame by a fixing support shaft, and a joint material that adjusts the thickness on the upper surface of the main body, and is pressed into a mortise formed in the upper surface of the main body. The joint material is joined to the main body through a mating tenon.
[0015]
According to the present invention, the main body is fixed in a state of being floated from the lower frame by the fixing support shaft, and the thickness of the main body is adjusted by superimposing the footing material on this, so that the thickness of the main body is made constant. As for the fixing shaft, it is sufficient to prepare one type having the same length regardless of the thickness of the joint material stacked on the main body.
[0016]
In addition, since the joint material is coupled to the main body through a tenon that is pressed and fitted into the tenon hole formed on the upper surface of the main body, a large frictional force is generated between the tenon and the tenon hole, and the main body and the joint The material adheres firmly. Therefore, even if buoyancy acts on the joint material by placing concrete, the joint material does not leave the main body, and it is not necessary to fix the joint material with a fixing shaft or the like.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a perspective view showing an example of a slab embedding material according to the present invention, FIG. 2 is a sectional view of the slab as seen from the front side, FIG. 3 is a sectional view of the slab as seen from the side, and FIG. Explanatory drawing which shows the shaping | molding method of material, FIG.5 and FIG.6 is a perspective view which shows other embodiment.
[0018]
The slab embedding material 1 of this example is used by being embedded in the concrete 2 when the concrete 2 is placed and the slab 3 is constructed. A main body 1A fixed in a state of being floated from the ceiling material 4 by a fixing shaft 5 erected on the ceiling material 4 that also serves as a frame, and a footing material 1B (1B) that adjusts the thickness on the upper surface thereof. _{1 to} 1B ₃ ).
[0019]
The main body 1A is formed of, for example, a thick plate-like foamed resin material having a width of 700 mm, a length of 1200 mm, and a thickness of about 100 mm, and its upper surface is formed flat so that the joint material 1B can be stacked without any gaps. The bottom surface is formed as a circular arc surface that bulges downward along the width direction, except for a portion supported by the fixing support shaft 5 and a leg 9 described later.
[0020]
Further, on the center line extending in the longitudinal direction, a guide hole 6A having a width of about 100 mm and a length of about 200 mm for guiding the concrete 2 placed on the bottom surface side to the upper surface side is formed so as to penetrate to the bottom surface side. The wraparound of concrete can be seen from the top side.
[0021]
The guide hole 6A is formed in a quadrilateral shape with rounded corners, and has a shape that does not easily cause stress concentration even when an external force is applied to the main body 1A.
Further, the guide hole 6A is formed with a wide-angle opening toward the bottom surface, so that the concrete 2 that wraps around the bottom surface easily flows.
[0022]
Further, the front and rear ends in the longitudinal direction of the main body 1A are formed with pegging surfaces 7F and 7R, and a pair of left and right mounting holes 8 through which the fixing support shaft 5 is inserted are formed in each of the pegging surfaces 7F and 7R. The main bodies 1A and 1A are drilled so as to penetrate vertically in a state where the main bodies 1A and 1A are connected to each other.
[0023]
The fixing support shaft 5 is formed with a spacer flange 5a for floating the embedding material 1 at a predetermined height, and a binding flange 5b for holding the upper surface 1U of the embedding material 1 is engaged with the upper end of the spacer flange 5a. Is formed.
[0024]
Further, an insertion hole 10 for inserting the leg 9 into the bottom surface is formed at a substantially central position in the longitudinal direction of the main body 1A.
These legs 9 maintain the central part of the main body at the same height as the front and rear ends supported by the support shaft 5 for fixing, and a lower flange 9b placed on the ceiling material 4 is formed at the lower end of the support shaft 9a. The upper flange 9c for supporting the load is formed at a height at which the main body 1A comes into contact with the bottom surface.
[0025]
The joint material 1B is formed in a size that overlaps the main body 1A, and is formed with a guide hole 6B of the same shape and the same size communicating with the guide hole 6A. The upper surface of the joint material 1B is a tapered surface corresponding to the surface inclination of the slab 1. At the same time, the bottom surface is formed into a flat shape, and a tenon 12 is formed on the bottom surface by being pressed into a mortise hole 11 formed in the upper surface of the main body 1A, and is coupled to the main body 1A by the tenon 12. It is made like that.
[0026]
On the outer peripheral surface of the tenon 12, a protrusion or a ridge is formed which is sandwiched between the tenon holes 11 and is compressed and deformed. In this example, a rib 13 extending in the insertion direction is formed. Has been.
[0027]
In addition, as for the footing materials 1B _{1 to} 1B ₃ , those having different thicknesses are used depending on the place of installation as shown in FIG.
[0028]
The normal slab 3 has a slab thickness of about 25 cm at the end, a slab thickness of the thickest center of about 35 cm, and a distance from the end to the center of about 5 m. Are arranged in about 4 columns.
When a concrete thickness of 7.5 cm is secured above and below the slab embedding material 1, the row closest to the end is used without the footing material 1 </ b> B attached, and the footing becomes thicker toward the center. The materials 1B _{1 to} 1B ₃ are mounted on the main body 1A.
[0029]
Further, as shown in FIG. 4, the thin-walled and medium-thickness anchoring materials 1B ₁ and 1B ₂ used in two of the four rows are a foamed resin material 14 having a thickness of 100 mm in which tenons 12 are formed on both front and back surfaces. Are formed by cutting along the cutting line X so that the thicknesses are different depending on the inclination angle of the slab surface.
[0030]
Further, the thick joint material 1B ₃ used for the central slab row of the slab 3 having a thick slab is only the tenon 12 formed on the surface along the cutting line Y without cutting the foamed resin material 14 up and down. Is cut and molded. Thereby, thin-walled, medium-walled, and thick-walled anchoring materials 1B _{1 to} 1B ₃ can be formed with one mold.
[0031]
The above is an example configuration of the present invention, and its operation will be described next.
When constructing a roof slab 3 having a roof-type draining slope, first, a ceiling material 4 that also serves as a lower frame of the slab 3 is laid on the top floor ceiling surface, and the slab embedding material 1 is installed. The supporting shaft 5 is set up at the position.
[0032]
At this time, since all the main bodies 1A to be fixed by the fixing support shaft 5 are formed to have the same thickness, only one type of fixing support shaft 5 is sufficient, and it is troublesome to select a suitable one according to the slab thickness at the installation position. There is no risk of standing the wrong kind.
[0033]
Next, the main body 1A of the slab embedding material 1 is arranged at all the installation positions, the legs 9 are attached, the binding flange 5b of the fixing support shaft 5 is attached and fixed, and then the slab thickness at the installation position is set. Accordingly, the joint materials 1B (1B _{1 to} 1B ₃ ) having different thicknesses are stacked.
[0034]
Then, when the tenon 12 formed on the bottom surface of the joint material 1B is fitted into the tenon hole 11 formed on the upper surface of the main body 1A, the rib 13 formed on the outer peripheral surface of the tenon 12 is connected to the tenon hole 11. Compressed and deformed by being sandwiched between the gaps, the tenon 12 fits tightly into the tenon hole 11 to generate a strong frictional force.
[0035]
In this way, the anchoring material 1B can be easily and securely connected to the main body 1A fixed in a state of being floated from the ceiling material 4 by the fixing support shaft 5 without using a special fixing tool, Even if the buoyancy acts by placing concrete, the joint material 1B does not lift away from the main body 1A.
[0036]
In the above description, the tenon 12 is integrally formed on the bottom surface of the joint material 1B. However, as shown in FIG. 5, the tenon hole 15 is formed in the joint material 1B, and the main body 1A is formed. A mortise 16 that is pressed into and fitted into the mortises 12 and 15 of the joint material 1B may be used.
[0037]
In this case, a spacer 1C having a predetermined thickness in which a through-hole 17 that passes through the tenon 16 is formed between the main body 1A and the joint material 1B is set in accordance with the slab thickness of the place where the slab embedding material 1 is installed. If the necessary number of sheets is interposed, the thickness of the joint material 1B can be standardized and unified.
The spacer 1C is formed in a shape overlapping the main body 1A and the footing material 1B, and a guide hole 6C having the same shape and the same size communicating with the guide hole 6A may be formed.
[0038]
Moreover, although the case where the rib 13 which is sandwiched between the tenon 12 and the tenon hole 11 and is compressed and deformed is provided on the outer peripheral surface of the tenon 12, it may be formed on the inner peripheral surface of the tenon hole 11 may be used. In addition, any protrusions or protrusions can be formed without being limited to the rib 13 as long as the shape is compressed and deformed between the gaps.
[0039]
Further, as shown in FIG. 6, an engagement protrusion 7f is formed on one of the joint pricking surfaces 7F and 7R formed on the longitudinal front and rear ends of the main body 1A, and an engagement recess 7r is formed on the other. In this case, when the fixing support shaft 5 is inserted into and connected to the mounting holes 8.
[0040]
【The invention's effect】
As described above, according to the present invention, the main body is fixed in a state of being floated from the lower frame by the fixing support shaft, and the thickness of the main body is adjusted by overlapping the joint material on this. By forming it uniformly, it is only necessary to prepare one type of fixing shaft that has the same length regardless of the thickness of the joint material that is stacked on the main body. This is a very good effect that it can eliminate the loss of work time due to the selection of the fixing shaft and the attachment of the fixing spindle.
[0041]
In addition, since the joint material is joined to the main body through a tenon that is pressed and fitted into the tenon hole formed on the upper surface of the main body, a large frictional force is generated between the tenon and the tenon hole, so that a special fixing tool is used. There is also an effect that it is possible to securely fix the joint material to the main body without using.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a slab embedding material according to the present invention.
FIG. 2 is a cross-sectional view of a slab as viewed from the front side.
FIG. 3 is a cross-sectional view of the slab as seen from the side.
FIG. 4 is an explanatory view showing a molding method for a joint material.
FIG. 5 is a perspective view showing another embodiment.
FIG. 6 is a perspective view showing another embodiment.
FIG. 7 is a perspective view showing a slab embedding material proposed by the present inventor.
FIG. 8 is an explanatory diagram showing the state of use.
[Explanation of symbols]
1 ......... slab filler material 1A ...... body 1B _(1B 1 ~1B ₃₎ ...... Tsugiashi material 2 ......... concrete - DOO 3 ......... slab 4 ......... ceiling material (lower frame)
5 ......... Fixing support shaft 11 ....... Mortise hole 12 ....... Mortise 13 ....... rib (projection)

Claims (5)

When slab (3) is constructed by placing concrete (2), slab embedding material embedded in the concrete (2),
A main body (1A) fixed in a state of being floated from the lower frame (4) by a supporting shaft (5) erected on the lower frame (4) for molding the slab (3), and a thickness overlapping the upper surface thereof It consists of a footing material (1B) that adjusts the thickness,
The joint material (1B) is coupled to the main body (1A) through a tenon (12) which is pressed and fitted into a mortise hole (11) formed on the upper surface of the main body (1A). Slab embedding material. The slab embedding material according to claim 1, wherein the tenon (12) is integrally formed on the bottom surface of the joint material (1B). When the tenon (12) and the tenon hole (11) are fitted to the outer peripheral surface of the tenon (12) or the inner peripheral surface of the tenon hole (11), a protrusion or ridge that is sandwiched between the tenon and compressed and deformed ( The slab embedding material according to claim 1 or 2, wherein 13) is formed. The slab embedding material according to claim 1, wherein the upper surface of the joint material (1 B) is formed into a tapered surface corresponding to the surface inclination of the slab (3). The spacer (1C) having a predetermined thickness in which a through hole (11) is formed through the tenon (12) is sandwiched between the main body (1A) and the joint material (1B). Slab embedding material.

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