JP4024399B2 - On-site construction method for hollow slabs - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an on-site construction method for a hollow slab.
[0002]
[Prior art]
In building construction, hollow slabs have traditionally used half-PC versions such as the Omnia and Kaiser versions, set eslen voids on them, set up the upper streak at the site, and then cast concrete. It has been done.
[0003]
[Problems to be solved by the invention]
However, in the construction of a hollow slab using a half-PC version, the half-PC version manufactured at the factory is carried on-site and assembled, so there is no transportation cost from the factory to the site, and no lifting costs at the site. There is an expensive problem. In addition, in the construction using the half PC plate, the concrete placement work of the concrete for the half PC plate production at the factory and the top concrete placement work at the site are performed twice. It was necessary and was not necessarily an economical construction method.
[0004]
In addition, the conventional half PC version is basically designed as a unidirectional version, for example, the omni truss used in the omni version is oriented only in one horizontal direction. It was not always satisfactory.
[0005]
In view of the above-described conventional problems, an object of the present invention is to eliminate the use of a half-PC plate and to enable a hollow slab to be constructed on the spot in an advantageous manner.
[0006]
[Means for Solving the Problems]
The above-mentioned problem is that a floor formwork with a flat top surface is installed on the building frame, a lightweight void material is set in a floating state, concrete is placed thereon, and the void material is placed on the thickness of the cast-in-place concrete layer. The problem is solved by the on-site construction method for a hollow slab characterized by being embedded in the middle portion in the direction.
[0007]
That is, in this construction method, since the void material is placed in a floating state from the floor formwork and the concrete is placed, the lower surface side of the void material is also filled with the concrete, and the void material is replaced with the thickness of the concrete layer. It can be embedded in the middle part of the direction. Therefore, it is possible to eliminate the use of a conventional half-PC plate, and it is possible to construct a hollow slab on site in an advantageous manner in terms of cost while keeping transportation costs and lifting costs low.
[0008]
In the above method, the void material set is made to penetrate the void material before the set in a vertical direction in a dispersed state through a plurality of support materials,
Using the upper and lower void material positioning plates having a column insertion portion formed by extending a plurality of incision lines in the radial direction from the center,
Insert the strut into the strut insertion part of each positioning plate so that the embedded plate is sandwiched from above and below by these positioning plates, and elastically deform the plate piece between the cut lines in the insertion part on the opposite side of the void material. Let the plate piece elastically contact the outer periphery of the support material, hold the void material in the middle in the height direction of the support material,
It is preferable that the lower end portions of these support members are supported on the upper surface of the floor formwork.
[0009]
In this void material setting method, the plate pieces between the cut lines in the insertion portion of the positioning plate become a snap, and the void material can be firmly positioned and held in a floating state with a simple structure. In addition, since it is only necessary to insert the strut material into the void material and sandwich the void material from above and below with the positioning plate, it is very easy to attach to the void material, and the void material can be easily set in the floating state. it can.
[0010]
In addition, the void material is a box-like material, and a large number of these void materials are used. These void materials are arranged by being arranged at intervals in the two horizontal orthogonal directions, and the space between the void materials is used. The slab beam bars and / or truss bars may be set in a lattice pattern. Thereby, a hollow slab excellent in strength performance capable of transmitting a load in two directions can be formed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0012]
As shown in FIG. 1 (a), first, the floor formwork 1 is installed in the building frame using a support or the like as necessary. The floor mold 1 has a flat upper surface. For example, a flat deck or the like may be used in addition to a conventional floor mold. After construction, it is better to adopt a discarded formwork that becomes the ceiling.
[0013]
Then, as shown in FIG. 1 (b), the mesh-shaped upper streak 2 is set on the upper surface of the floor mold 1, and then, as shown in FIG. 1 (c), a set of lightweight void materials 3. Do.
[0014]
The void material 3 is made of, for example, a synthetic resin foam material such as styrene foam, and is made of a box-like body having a rectangular parallelepiped shape or a legislature shape as shown in FIG. For example, the length is 900 mm, the width is 450 mm, and the height is 130 mm. The void material 3 is provided with floating holders 4... For setting it in a floating state from the upper surface of the floor mold 1. A plurality of the floating holders 4 are provided in a dispersed state with respect to one void material 3 in order to stably install the void material 3 in a floating state. In the case of the illustrated embodiment, six floating holders 4 are provided for one void material.
[0015]
As shown in FIG. 5 (a), each floating holder 4 includes a support member 5, a pair of positioning plates 6 and 7 for positioning a void material, and a receiving plate 8 for receiving upper end bars.
[0016]
The strut material 5 has a length longer than the height of the void material 3, and a base plate 5a is provided at the lower end thereof.
[0017]
As shown in FIG. 4 (a), each of the positioning plates 6 and 7 and the receiving plate 8 is made of a thin disc material 9 and has a column insertion portion 10 at the center. This column insertion portion 10 has a hole 10a having a diameter smaller than the outer diameter of the column material 5 at the center of the thin disk member 9, and a plurality of score lines radially outward from the peripheral portion of the hole 10a. 10b is extended.
[0018]
As shown in FIG. 4 (b), the thin disc material 9 is inserted into the insertion portion 10 with the support material 5, and the plate pieces 10c between the cut lines 10b are elastically deformed to deform each plate piece 10c. By elastically contacting the outer peripheral surface of the support material 5, the support material 5 is held on the outer periphery of the support material 5. When the thin disk member 9 is moved in the direction opposite to the insertion direction, the plate pieces 10c are held together and the displacement movement in that direction is regulated with a strong force to some extent. ing. In order to secure this tension, it is preferable to form the outer peripheral surface of the column member 5 on a rough surface provided with minute irregularities or a large number of annular grooves. However, by moving the thin disk member 9 with a force exceeding the pulling force, the direction of bending of the plate pieces 10c of the thin disk member 9 is opposite to the moving direction, as shown in FIG. The direction is changed so that the direction of regulation can be changed in the opposite direction to that in FIG.
[0019]
The mounting of the floating holder 4 on the void material 3 can be performed, for example, as follows. That is, first, one positioning plate 6 is inserted and attached from the upper end of the column member 5. The positioning plate 6 receives the lower surface of the void material 3 and holds the void material 3 in a floating state. Therefore, the plate piece 10c in the insertion portion 10 is directed downward as shown in FIG. Set to be. As shown in FIG. 5B, such a set state can be obtained by forcibly displacing the positioning plate 6 inserted into the column material 5 upward. Thereafter, the support material 5 is inserted into a hole 3a formed through the void material 3 in the vertical direction.
[0020]
Then, the other positioning plate 7 is inserted and attached from the upper end of the column material 5, and the void material 3 is sandwiched between the upper and lower positioning plates 6 and 7 in the intermediate portion in the height direction of the column material 5. The upper positioning plate 7 regulates the unintentional displacement movement of the void material 3 upward, and the plate piece 10c of the insertion portion is set so as to face downward. As a result, the void material 3 is held at the intermediate position of the column material 5 in the height direction. Adjustment of the height position of the void material 3 in the support material 5 can be easily performed by moving the upper and lower positioning plates 6 and 7 up and down.
[0021]
Finally, the receiving plate 8 is attached to the upper end portion of the column material 5. The receiving plate 8 is preferably set so that a predetermined interval is provided above the positioning plate 7 on the upper side and the direction of the plate piece 10c in the insertion portion 10 is directed downward.
[0022]
As shown in FIG. 1 (c), the void member 3 having the plurality of floating holders 4 attached in a dispersed state is grounded to the upper surface of the floor form frame 1 as shown in FIG. Set. As a result, the void material 3 is set in a separated state in which the void material 3 floats upward from the upper surface of the floor mold 1 by a predetermined height. In the present embodiment, as shown in FIG. 6, the void members 3 are set by being arranged at intervals in two horizontal orthogonal directions.
[0023]
Thereafter, as shown in FIG. 2 (d), the slab beam 12 is set using the space between the void members 3. As shown in FIG. 6, the slab beam 12 is set in a lattice shape using a space between the void members 3.
[0024]
Then, as shown in FIG. 2 (e), the mesh-shaped upper streak 13 is set, and as shown in FIG. 2 (f), concrete 14 is placed. Since the concrete 14 must be filled also on the lower surface side of the void materials 3..., It is preferable to use high fluidity concrete. Since the high fluidity concrete is a harmonious concrete, by using the high fluidity concrete, advantages such as suppression of cracking and high strength of the concrete can be derived. By placing concrete, a force in the lifting direction, that is, buoyancy, acts on the void material 3, but the upper bar 13 is supported on the receiving plate 8, so that the void material 3 is lifted by its own weight. This prevents the void material 3 from being embedded in the concrete 14. As described above, the hollow slab is constructed on site without using the half PC plate.
[0025]
Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, instead of the slab beam 12, as shown in FIG. 7, a configuration in which a truss bar 16 is used may be used, or a slab beam and a truss bar may be used in combination. Moreover, in invention of Claim 1, 2, it may be comprised as a unidirectional plate which transmits a load only to one direction, and there is no special restriction | limiting in the shape and size of the void material 3, Various shapes and sizes The bar material may be used. In the first aspect of the present invention, the void material may be held in a floating state using a floating holding tool other than the above.
[0026]
【The invention's effect】
Depending on the above, the method for constructing a hollow slab according to the present invention is to place the void material in a floating state from the floor formwork and place the concrete, so the void material is placed in the middle of the thickness direction of the concrete layer. The use of a half-PC plate as in the prior art can be eliminated, and a hollow slab can be constructed on site in a cost-effective manner while keeping transportation costs and lifting costs low.
[0027]
In addition, by using the strut material and the positioning plate having the specific structure as described above, the void material can be set in a floating state with a simple structure. In addition, it is very easy to attach these floating holders to the void material, and the void material can be easily set in the floating state.
[0028]
In addition, the void material is a box-like material, and a large number of these void materials are used. These void materials are arranged by being arranged at intervals in two horizontal orthogonal directions, and the space between the void materials is utilized. By setting the slab beam bars and / or truss bars in a lattice shape, it is possible to construct a hollow slab that can transmit a load in two directions and has excellent strength performance.
[Brief description of the drawings]
FIGS. 1A to 1C are cross-sectional views sequentially showing an embodiment method together with FIGS.
FIGS. 2 (a) to 2 (f) are sectional views sequentially showing an embodiment method together with FIGS. 1 (a) to 1 (c).
FIGS. 3A and 3B are perspective views of void materials each equipped with a floating holder.
FIGS. 4A to 4C are perspective views showing a method for attaching a positioning plate and a receiving plate in a floating holder, respectively.
5A is a cross-sectional side view showing a state in which a void material is held by a floating holder, and FIG. 5B is a cross-sectional side view showing a mounting method of a lower positioning plate.
FIG. 6 is a plan view of a hollow slab in the embodiment.
FIG. 7 is a cross-sectional view of a hollow slab, showing a modification.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Floor form 3 ... Void material 4 ... Levitation holder 5 ... Posting material 6 ... Positioning plate 7 ... Positioning plate 10 ... Posting insertion part 10b ... Cut line 10c ... Plate piece 12 ... Slab beam 14 ... Concrete 16 ... Truss muscle

Claims (3)

A floor formwork with a flat top surface is installed on the building frame, a lightweight void material is set in a floating state on it, concrete is placed, and the void material is embedded in the middle of the in-situ concrete layer in the thickness direction. In the on-site construction method of the hollow slab to be in a state ,
A plurality of support materials are vertically penetrated into the void material before setting in a dispersed state, and the void material is sandwiched from above and below by the upper and lower void material positioning plates attached to the support materials. After being held in the middle of the direction,
Ground the lower end of these support materials in a non-connected state on the floor form upper surface, set the void material in a floating state from the floor form upper surface,
The upper concrete is set and the concrete is placed, so that the void material is prevented from rising by the weight of the upper muscle only by receiving the upper reinforcement on the upper reinforcement plate attached to the upper end of the support material. An on- site construction method for hollow slabs characterized by Wherein below each void material positioning plate have a strut insertion part formed to extend in the radial direction a plurality of score lines from the center,
Insert the post to strut insertion part, it is deformed resiliently deformed opposite Nogawa the void material the plate piece between the score lines in the spigot, by elastic contact with the plate piece to the outer circumferential portion of the struts, void material Is held in the middle in the height direction of the column material ,
The outer peripheral portion of the support material is formed into a rough surface, and when the positioning plate is moved in the direction of bending of the plate piece between the cutting lines in the insertion portion of each void material positioning plate, the rough surface causes the plate piece to be moved. moving prevents become bumping, moving the positioning plate with a force exceeding the bumping force, plate pieces is the direction of the deflection, that have been made to change the direction opposite to the moving direction according Item 2. A method for constructing a hollow slab according to item 1.   A floating holder used to set a lightweight void material in a floating state on a flat floor form frame installed on a building frame,
  A strut material penetrating the void material in the vertical direction;
  The upper and lower void material positioning plates that are attached to the strut material and sandwich the void material from above and below and hold it in the middle in the height direction of the strut material;
With
  Each of the upper and lower void material positioning plates has a column insertion portion formed by extending a plurality of cut lines in the radial direction from the center portion,
  A column is inserted into the column insertion part, and the plate piece between the cut lines in the insertion unit is elastically deformed and deformed on the opposite side of the void material, and the plate piece is in elastic contact with the outer periphery of the column material. By doing so, it is made to hold the void material in the middle in the height direction of the support material, and
  The outer peripheral portion of the support material is formed into a rough surface, and when the positioning plate is moved in the direction of bending of the plate piece between the cutting lines in the insertion portion of each void material positioning plate, the rough surface causes the plate piece to be moved. When the positioning plate is moved with the force exceeding the pulling force, the plate piece is designed to change the direction of its bending to the opposite direction to the moving direction. A lightweight void material floating holder.

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