JP2005282010A - Concrete void slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete void slab positioning the height of a void form 40 by making use of buoyancy and facilitating the mounting of an upward moving guide 11 of the void form. <P>SOLUTION: In two-way concrete void slab placing the blowing resin-made void form 40 in a lattice-like checkers space S consisting of upper end lines 2 and lower end lines 3, the void form inserts a downward guide lever 11 of a fixed supporting lever 10 in the upper end lines 2 through a hole 43, and the void form is led to the guide lever 11 by buoyancy to move it upward to position it on a required height and is embedded by placing a concrete C. Thus, in the case the lever 10 having the upward moving guide 11 is fixed to the upper end lines 2, there is no need of elimination work of the levers 10 and 11. If there is an uneven step 44 in the lower part of the void form, since the concrete is poured in the uneven step to effectively operate buoyancy, the void form is smoothly moved upward. The void form is installed after both up and down end lines 2 and 3 have been arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete void slab in which a lightweight void form is disposed between upper and lower reinforcement bars and a method for constructing the same.

As a concrete void slab of this kind, for example, as shown in FIG. 5, the upper form 2 is arranged in a grid pattern on the floor mold 1, and the bottom line 3 is also arranged in a grid form. There is a structure in which a lightweight void 4 made of foamed resin or the like is disposed in a grid-like space S and concrete is placed (see Patent Documents 1 and 2).
JP-A-9-250196 Japanese Patent No. 331340

In the construction of the concrete void slab, it is necessary to prevent the void form 4 from being lifted up and prevent the void form 4 from coming out of the space S of the upper and lower end bars 2 and 3 when placing concrete.
Conventionally, this has been prevented by connecting the void form 4 to the upper and lower reinforcing bars 2 and 3 by various means. For example, as shown in FIG. 5, auxiliary muscles 5 crossing each grid-like space S are passed over the upper and lower muscles 2, 3, and the upper and lower surfaces of each void form frame 4 are suppressed by the auxiliary muscles 5 to raise the muscles. I try to prevent it.
Further, a locking tool 6 straddling the auxiliary muscle 5 is inserted into the upper surface of the void mold 4 so as to prevent the lateral movement.
However, it is troublesome to provide auxiliary muscles 5 on the upper and lower muscles 2 and 3 and to accurately position the auxiliary frame 5 with the void form frame 4 between the upper and lower auxiliary muscles 5.

For this reason, the void form frame 4 is not prevented by sandwiching the void form frame 4 by the upper and lower end reinforcements 2 and 3 or the upper and lower auxiliary muscles 5 but by using the lift (buoyancy). There is also a technique of positioning at a height (Patent Documents 3 and 4).
JP 2000-192591 A JP 2000-234409 A

  The technology using the buoyancy is a technique in which a guide rod is raised from the floor mold 1, the void frame 4 is fitted to the guide rod so as to be movable up and down, and a stopper is provided at the upper end of the guide rod. For this reason, when concrete is placed, as the concrete is placed, the void form frame 4 floats until it hits the retaining material, and thereafter, the position is maintained and the concrete is buried in the concrete.

  However, the conventional technique using buoyancy involves attaching a guide rod to the floor mold 1 and removing the guide rod from the floor mold 1 after placing concrete. For this reason, the guide rod is screwed to the floor mold 1 and the screw coupling is removed to remove the guide rod from the floor mold 1.

  At that time, since the guide fence is buried in the concrete layer, the floor mold 1 is removed after being separated from the guide fence. For this reason, conventionally, the above-described screw connection can be removed from the lower surface of the floor formwork, the structure is complicated, and there is a problem in cost, and the workability of attaching and removing the guide rod is poor.

  This invention makes it a subject to make easy attachment of the guide for the upward movement of the void form frame in the technique which positions the height of a void form frame using a buoyancy.

In order to achieve the above object, according to the present invention, the guide for upward movement of the void form frame is provided on a collar fixed to the upper end muscle.
As described above, if the ridge having the upward movement guide is fixed to the upper end reinforcement, the ridge removal work is not required if the ridge can be buried when placing concrete. Of course, it is natural that the ridge is made of a material that does not hinder even if it is embedded in a concrete layer such as a reinforcing bar.

  According to the present invention, since the guide for moving the void form frame upward is provided on the heel fixed to the upper end muscle, it is not necessary to remove the guide and the workability is good.

  As one embodiment of the present invention, a grid-like lower end bar is provided in parallel with a gap in the vertical direction like the grid-like upper end line, and a lightweight void formwork is disposed between the upper and lower side bars, and the concrete is In the placed concrete void slab, a support rod fixed to the upper end reinforcement faces above the void formwork, and a downward-facing guide rod is provided on the support rod, and the void formwork is attached to the guide rod. It is possible to adopt a configuration in which the void form is guided by the guide rod by buoyancy and moved upward and positioned at a required height by being stabbed movably upward from below and by placing the concrete. .

  In this configuration, the lattice-shaped upper end bar is usually composed of a lattice-shaped longitudinal reinforcing bar and a horizontal reinforcing bar, and the support rod is fixed to either the longitudinal reinforcing bar or the horizontal reinforcing bar. However, if the support bar is configured to be fixed to the reinforcing bar between the lower reinforcing bars, the upper reinforcing bars and the supporting bar can be at substantially the same level. In addition to its good appearance, it is also advantageous in designing the strength of the slab.

Since the void formwork moves upward by buoyancy, it is preferable to have a shape that easily receives the buoyancy. For example, if the void form has a step that retreats below the side surface at the lower part, the void formwork retreats (drops). ) Since the concrete enters the step and causes buoyancy to act on the upper surface of the step, the void formwork moves smoothly upward.

In addition, the shape of the void form is arbitrary as long as the strength of the slab is not hindered. However, if the shape is symmetrical in the vertical and horizontal directions and the front and back, for example, a sphere, a cube, etc. Can be provided without worrying about the direction (direction) of the void form.

These concrete void slabs are constructed in the same construction order as before. For example, the bottom line is placed on the floor form, the void form is placed in the grid space of the bottom line, and then the top line is provided. However, for example, the floor form frame is provided with a lattice-like lower end line in parallel with the upper and lower lines in the same manner as the lattice-like upper end line, and after placing the void form frame between the upper and lower end lines, the support The guide rod of the heel is pierced into the void mold and the support ridge is fixed to the upper end muscle, and concrete is placed after the piercing support is freely moved upward to each void mold by the guide ridge. The method can be adopted.
As described above, if the void form is installed after the upper and lower end bars are arranged, the bar arrangement work can be performed at one time, and the workability is improved.

  1 to 4 show an embodiment, and the void form frame 40 of this embodiment is made of a solid foamed resin, and as shown in FIG. It is a cylindrical body that has a shape similar to a lantern with a symmetrical shape in the top, bottom, left and right, and front and rear, with a flat cylindrical body 42 in the middle of the top and bottom surfaces, and a guide hole 43 passes through the central axis. .

  The downward guide rod 11 of the support rod 10 is inserted into the guide hole 43, and the void form frame 40 freely moves in the axial direction of the guide rod 11 using the guide rod 11 as a guide. The length of the support rod 10 is arbitrary as long as both ends thereof can be fixed to any one of the upper end bars 2 and is appropriately set in consideration of workability. The guide hole 43 does not need to be formed only by inserting the guide rod 11 into the void mold frame 40 made of foamed resin and moving the void mold frame 40 with respect to the guide rod 11. The support rod 10 and the guide rod 11 are arbitrarily formed as an integrally formed product or a welded joint product, and the material thereof may be made of the same reinforcing bars as the upper and lower end bars 2 and 3.

  As shown in FIGS. 1 and 4A, the void mold 40 has upper and lower ends 2 and 3 disposed on the floor mold 1, and the upper and lower ends 2 and 3 between the upper and lower ends 2 and 3. The guide rods 11 of the support rods 10 are inserted into the guide holes 43 of the respective void molds 40, and both ends of the support rods 10 are connected to the upper end bars 2. Secure with 15 ties. The upper muscle 2b and the lower muscle 2a of the upper muscle 2 may be fixed, but the lower muscle 2b on the lower side is preferable as shown.

After the piercing support that can move freely above each void formwork 40 by the guide rod 11 is completed, auxiliary bars and the like are arranged as necessary, and concrete C is placed. As shown in FIG. 4B to FIG. 4C, the void form frame 40 is raised by being guided by the guide rod 11 due to the buoyancy received from the concrete C as shown in FIGS. A two-way concrete void slab is constructed, positioned in contact and buried in the required position in the layer of concrete C.

At this time, if a stop rod or the like is provided in the middle of the guide rod 11 and the rise of the void form frame 40 is prevented by contact with the stop rod or the like, the contact position is embedded in the void form frame 40. It becomes height. For this reason, the height of the void form frame 40 can be appropriately set by appropriately setting the height of the retaining rod or the upper end muscle 2.

  The upper and lower reinforcement bars 2 and 3 are arranged in the same manner as in the prior art, and are connected and fixed by an appropriate means and provided in parallel with an interval in the vertical direction. In addition, the floor mold 1 employs not only those that are removed after placing and solidifying the concrete C, such as wooden items, but also various known items that are discarded frames, such as iron items. obtain.

  In this embodiment, for example, the void mold 40 has an outer diameter in plan view: 190 mm, the same height h: (slab thickness−102) mm, and a guide hole 43: 10 mm in diameter. (Pitch of guide rod 11): 300 mm, number of guide rods 11 of one support rod 10: 3 (supporting three void formwork 40 with one support rod 10), diameter of guide rod 11: 6 mm As a result, the best results were obtained in terms of workability and slab strength.

Schematic perspective view of one embodiment Cut front view of the same embodiment Operation perspective view of the embodiment Action explanatory diagram of the same embodiment Schematic perspective view of a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor form frame 2 Top bar 2a Lower upper bar 2b Upper upper bar 3 Upper bar 4, 40 Void frame 10 Support rod 11 Guide rod 41 Void frame main body 43 Guide hole 44 Step C Concrete S Grid-like space

Claims (5)

Similar to the lattice-shaped upper streak 2, the lattice-shaped lower rebar 3 is provided in parallel with a gap in the vertical direction, and a lightweight void form frame 40 is disposed between the upper rebar 2 and the lower rebar 3, and concrete C is placed. In concrete void slabs
A support rod 10 fixed to the upper end muscle 2 faces above the void form frame 40, and a downward guide rod 11 is provided on the support rod 10, and the void form frame 40 is located below the guide rod 11. The void form frame 40 is guided by the guide rod 11 by buoyancy and moved upward by the placement of the concrete C, and is positioned at a required height. Characteristic concrete void slab.   The lattice-shaped upper rebar 2 is composed of a lattice-shaped longitudinal reinforcing bar 2a and a horizontal reinforcing bar 2b, one of which is located on the upper side and the other 2a on the lower side. The concrete void slab according to claim 1, wherein the rod 10 is fixed to the reinforcing bar 2 a across the reinforcing bars 2 a located on the lower side.   The concrete void slab according to claim 1 or 2, wherein the void form frame (40) has a step (44) in which a lower part of the lower side surface recedes.   The concrete void slab according to claim 3, wherein the void formwork 40 has a symmetrical shape in the up / down / left / right and front / rear directions. A method for constructing a concrete void slab according to any one of claims 1 to 4,
In the floor mold 1, a grid-like lower end stripe 3 is provided in parallel with a gap in the vertical direction like the grid-like upper end stripe 2, and a lightweight void form frame 40 is disposed between the upper end stripe 2 and the lower end stripe 3. The guide rod 11 of the support rod 10 is pierced into the void form frame 40 and the support rod 10 is fixed to the upper end muscle 2, and the piercing support that is movable upward to each void form frame 40 by the guide rod 11 is completed. After that, a concrete void slab construction method characterized by placing concrete C.

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