JP3673108B2 - Hollow slab void member installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a void member installation method for a hollow slab made of reinforced concrete, and more particularly to a void member installation method that facilitates the installation of a void member and has high installation accuracy.
[0002]
[Prior art]
Conventionally, when installing void slab void members and reinforcing bar construction only on site, first, the reinforcing bar arranges the lower end reinforcing bar on the slab formwork consisting of multiple formwork panels, and then voids. The worker of the construction company slabs the void member fixing brackets for fixing the void member at predetermined equal intervals on the projection line on the slab form panel of the longitudinal center line of the void members arranged in parallel at a predetermined position. The void members are arranged and fixed by fixing the void members with the void member fixing metal fittings, and after that, the reinforcing bars are placed on the slab mold frame so as not to interfere with the void members. A spacing member is installed at a density of about m ^2, and the upper end reinforcing bars are arranged so as to be supported on the spacing member.
[0003]
[Problems to be solved by the invention]
However, the conventional hollow slab void member installation method still has the following problems to be solved.
(1) When constructing, first mark the position for mounting the void member fixing bracket on the center line of the void member and the center line so as not to interfere with the lower end reinforcing bar. Drilling work is required, and the number of mounting holes is very large in order to fix the void members for each row. As a result, a skilled engineer such as an inking engineer is required. There was a problem that the construction was longer for the duration of the drilling work.
(2) When the used formwork panels dismantled after placing concrete are reused on the upper floor, each formwork panel that constitutes the slab formwork must be placed so that it is exactly the same as the one used last time. Since the layout of the formwork panels can be directional, the efficiency of the work of placing the formwork panels may be reduced. This requires adjustment with the formwork operator and causes trouble. There was a drawback that it often became.
(3) When placing the upper end reinforcing bars, it is necessary to install an interval retaining member for the upper end reinforcing bars, and the upper end reinforcing bars other than the supporting points float in the air only by being supported by the interval retaining members. It becomes a state. For this reason, the workability of the reinforcement of the upper end rebar is poor, and there is a bar arrangement tool for adjusting the difference in the finished state due to the difference in the ability of workers and the slowness of the work speed to some extent, Had to be placed.
[0004]
The present invention has been made in view of such circumstances, and void members of a hollow slab capable of accurately and efficiently arranging and fixing the void members constituting the hollow slab at a construction site and improving the bar arrangement workability. The purpose is to provide an installation method.
[0005]
[Means for Solving the Problems]
The void member installation method of the hollow slab according to the present invention that meets the above-described object is manufactured by sequentially placing a lower end reinforcing bar, a plurality of void members arranged in parallel, and an upper end reinforcing bar on a slab form, and then placing concrete into the slab formwork. In a void member installation method for a reinforced concrete hollow slab, a long bottom member arranged in a direction perpendicular to the longitudinal direction of the void member, and a void provided in the bottom member and capable of inserting each void member A plurality of positioning fittings provided with a pair of side stoppers that can prevent horizontal movement perpendicular to the longitudinal direction of the member are provided on the lower end reinforcing bar. Therefore, the positioning can be easily performed only by inserting the void member into the paired side stopper.
[0006]
Here, a buoyancy receiving reinforcing bar is arranged on the upper surface of the void member inserted into the positioning metal fitting in a direction orthogonal to the longitudinal direction of the void member, and a pressing member in a direction orthogonal to the buoyancy receiving reinforcing bar is placed on two adjacent buoyancy receiving reinforcing bars. the provided, tightening the lower slab form via the locking hook bolt float the pressing member is fixed. Thereby, it is possible to prevent the void member generated at the time of placing the concrete and the concrete reinforcing reinforcing bar connected to the void member from being lifted.
Moreover, while using a buoyancy receiving reinforcing bar as a support stand of an upper end reinforcing bar, and using an upper end reinforcing bar as a pressing member, it is not necessary to prepare a pressing member separately.
Further, the upper part of the paired side stoppers is formed in a concave shape that can prevent horizontal movement only by placing the buoyancy receiving reinforcing bars, thereby facilitating the positioning work of the buoyancy receiving reinforcing bars.
The paired side stoppers are made of steel bars, so that they are lightweight and easy to process.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
FIG. 1 is a plan sectional view of a reinforced concrete hollow slab manufactured by applying a hollow slab void member installation method according to an embodiment of the present invention, and FIG. 2 is a void slab void member installation method of the hollow slab. Fig. 3 is a front view of a positioning metal fitting used for the void member installation method of the hollow slab, and Fig. 4 is used for the void member installation method of the hollow slab. 5 is a sectional view taken along the line II in FIG. 2, FIG. 6 is a sectional view taken along the line II-II in FIG. 2, and FIG. 7 is a sectional view taken along the line III-III in FIG. .
[0008]
As shown in FIGS. 1 and 2, a hollow slab 10 made of reinforced concrete manufactured by applying a void slab void member installation method according to an embodiment of the present invention includes a spacer (not shown) on a slab formwork 11. The lower end reinforcing bar 12 arranged through the hollow, the hollow tube 13 having a hollow portion which is an example of a plurality of void members arranged in parallel, and the upper end reinforcing bar 14 are sequentially arranged, and then the concrete 15 is driven and configured. Has been. This will be described in detail below. In addition, as shown in FIG. 1, let the length direction of the hollow slab 10 be the X direction, the width direction be the Y direction, and let the direction orthogonal to the XY plane be the Z direction.
[0009]
The slab formwork 11 is formed in a predetermined size by joining a plurality of wooden formwork panels.
As shown in FIGS. 2, 5, and 7, the lower end reinforcing bar 12 is made of steel bar or deformed bar steel, and a plurality of lower end force reinforcing bars 16 extending in the X direction with predetermined intervals in the Y direction are provided on the lower side. A plurality of lower principal bars 17 extending in the Y direction at predetermined intervals in the X direction are integrally formed on the lower force distribution bars 16 by welding or binding wires.
The hollow tube 13 is fitted and arranged in a positioning space portion 19 formed in the positioning fitting 18 shown in FIGS.
[0010]
As shown in FIGS. 1 to 4, the positioning fitting 18 includes a bottom muscle 20 which is an example of two long bottom members extending in the X direction with a predetermined interval in the Y direction, and an inner side of the bottom muscle 20. The base portion is welded to each other, and a plurality of pairs of gate-shaped side stoppers 21 are arranged at the pitch of the hollow tube 13. The bottom reinforcement 20 and the side stopper 21 are made of steel bars. As shown in FIGS. 3 and 4, the hollow tube 13 is in contact with the side stopper 21 at points A and C, while the bottom reinforcement 20 is at point B. I try to make contact. Therefore, in the direction (X direction) orthogonal to the length direction (Y direction) of the hollow tube 13, it is fitted and arranged in each positioning space portion 19 formed in a plurality of positioning fittings 18 arranged at a predetermined interval. Each of the hollow tubes 13 thus formed has a structure in which the movement in the horizontal direction and the vertical direction is suppressed and positioning can be performed simply by being inserted.
[0011]
As shown in FIGS. 4 to 6, the upper portion of the side stopper 21 is formed in a concave shape so that a buoyancy receiving bar 22 described later can be placed and the horizontal movement of the buoyancy receiving bar 22 can be prevented. Yes.
As shown in FIGS. 1, 2, and 6, a hollow portion is formed on the upper surface of the concave portion or the hollow tube 13 formed on the top of the six positioning brackets 18 arranged at a predetermined interval in the Y direction. A buoyancy receiving rebar 22 is placed in a direction (X direction) orthogonal to the longitudinal direction of the tube 13, and the pressing member is orthogonal to the buoyancy receiving rebar 22 so as to straddle two adjacent buoyancy receiving rebars 22. As an example, a balance rod 23 is disposed between the hollow tubes 13 at a predetermined interval. In FIG. 1, six buoyancy receiving bars 22 and 15 balance bars 23 are used. As shown in FIG. 6, the length of the balance rod 23 is a length that protrudes about 50 mm from the buoyancy receiving reinforcing bars 22 on both sides. In order to facilitate positioning of the balance rod 23, the protruding portion is inclined downward. Thus, a structure capable of being hooked to the buoyancy receiving reinforcing bar 22 can be provided.
[0012]
As shown in FIG. 6, the balance rod 23 is fixed to the slab mold frame 11 via a non-lifting hook bolt 25 having an inverted U-shaped hook 24 at the tip. A male threaded portion 26 is formed at the lower end of the buoyancy hook bolt 25, and a flange portion 28 abuts the lower surface 27 of the slab mold 11 below the buoyancy hook bolt 25 and a male threaded portion 29 at the upper end. A foam tie 30 (or connecting rod) in which is formed is disposed. The buoyancy hook bolt 25 and the foam tie 30 are formed with a male screw portion 26 and a female screw portion 29 in which the male screw portion 29 of the float tie 30 can be screwed at the center of the shaft. It has a structure that can be fixed by a cylindrical regicon (or threaded joint) 32 having a flange 31 that contacts the upper surface of the frame 11.
[0013]
As shown in FIG. 2 and FIG. 7, a connecting fitting for connecting the buoyancy receiving reinforcing bar 22 and each of the two bottom reinforcing bars 20 to the positioning fitting 18 excluding the space between the hollow tubes 13 to which the balance rods 23 are attached. 33 and 34 are provided. The connecting fittings 33 and 34 are made of steel bars, and as shown in FIG. 7, J-shaped hook portions 35 and 36 are formed at the lower end portion, and L-shaped hook portions 37 and 38 are formed at the upper end portion. The hollow tube 13 can be firmly fixed to the positioning member 18 by the connecting fittings 33 and 34. As a result, the hollow tube 13 is fixed against the buoyancy with respect to the hollow tube 13 generated when placing concrete. Can be held in position.
[0014]
As shown in FIGS. 2, 5, and 7, the upper end reinforcing bar 14 has an upper end main reinforcing bar 39 disposed on a buoyancy receiving reinforcing bar 22 as a support base in a direction perpendicular to the buoyant receiving reinforcing bar 22 (Y direction); The upper end reinforcing bar 40 is arranged on the upper main bar 39 in a direction (X direction) orthogonal to the upper main bar 39 and integrated by welding or a binding line.
[0015]
Next, a method for manufacturing the hollow slab 10 made of reinforced concrete by applying the void member installation method of the hollow slab according to the embodiment of the present invention will be described.
A plurality of wooden formwork panels are joined to form a slab formwork 11 of a predetermined size, and a hole through which the male thread portion 29 of the foam tie 30 can be inserted into the slab formwork 11 for centering the hole. After forming.
The lower end reinforcing bar 12 is placed on a spacer (not shown) appropriately disposed on the upper surface of the slab formwork 11, and six positioning brackets 18 are predetermined in the Y direction on the lower end main reinforcing bar 17 of the lower end reinforcing bar 12 as shown in FIG. Place with a gap of.
[0016]
Next, as shown in FIG. 1, the 20 hollow tubes 13 are fitted into the positioning space 19 between the side stoppers 21 forming a pair of the positioning brackets 18 so as to be orthogonal to the six positioning brackets 18.
As shown in FIG. 1, six buoyancy receiving reinforcing bars 22 are placed in the concave portion at the upper end of the side stopper 21 of the positioning bracket 18, and as shown in FIGS. 1 and 6, the adjacent buoyancy receiving reinforcing bars 22 are adjacent to each other. 15 balance rods 23 are arranged so as to straddle, and then the buoyancy receiving bar 22 and the slab formwork 11 are fastened and fixed by the floating hook bolt 25, the foam tie 30 and the regicon 32.
[0017]
Further, as shown in FIG. 7, the buoyancy receiving reinforcing bar 22 and the two bottom reinforcing bars 20 as a pair of the positioning fittings 18 are connected by connecting fittings 33 and 34. In the arrangement of FIG. 1, if one set of the connecting brackets 33 and 34 is provided, a total of 84 sets (14 sets per positioning bracket 18 are required) are attached.
As shown in FIGS. 2, 5, and 7, the upper end reinforcing bar 14 having the upper end main reinforcing bars 39 arranged in the direction (Y direction) orthogonal to the buoyant force receiving reinforcing bars 22 is arranged on the six buoyancy receiving reinforcing bars 22. .
[0018]
Finally, a wooden formwork panel (not shown) for preventing concrete spillage is placed and fixed around the four sides of the slab formwork 11, and then concrete is placed. After curing the concrete, the formwork panel 11 is attached. It disassembles and the manufacture of the hollow slab 10 is complete | finished.
Therefore, in the void slab void member installation method according to the embodiment of the present invention, the hollow tube 13 can be easily and accurately installed by simply inserting the hollow tubes 13 into the plurality of positioning fittings 18. Moreover, since the upper part of the side stopper 21 which becomes a pair of the positioning metal fitting 18 is formed in a concave shape, the horizontal movement can be prevented only by placing the buoyancy receiving reinforcing bar 22.
[0019]
In the above embodiment, the balance rod 23 is used as an example of a pressing member in order to fasten and fix the buoyancy receiving reinforcing bar 22 to the formwork panel 11 with the floating hook bolt 25 or the like. Accordingly, instead of the balance bar 23, the upper end main reinforcing bar 39 or the upper end distributing bar 40 constituting the upper end reinforcing bar 14 can also be used. As a result, the number of parts is reduced, and processing costs and construction costs are reduced.
Three balance rods 23 are provided in the Y direction, but a single balance rod that can cover the length of the three balance rods 23 can also be used. Moreover, in FIG. 1, the balance rod 23 is counted from the top of the drawing, between the first positioning bracket and the second positioning bracket, between the third positioning bracket and the fourth positioning bracket, or the fifth positioning bracket. Although arranged between the sixth positioning brackets, the present invention is not limited to this, and may be disposed between the second positioning bracket and the third positioning bracket, or between the fourth positioning bracket and the fifth positioning bracket.
[0020]
As an example of the long bottom member constituting the positioning fitting 18, the two bottom bars 20 made of deformed steel bars or steel bars have been described. However, depending on the situation, a single plate material may be used. Moreover, although the side stopper 21 used as the pair of the positioning metal fitting 18 was also formed by processing a steel bar, it can also be formed from a plate material as necessary.
Although the hollow tube 13 was demonstrated as a void member, it is not limited to this, You may consist of a polyfoam lightweight material containing a foamable material.
Both the lower end and the upper end rebar can be manufactured by processing, welding, or the like at the construction site, or can be assembled at the construction site by being formed in a grid shape of a size that can be transported in advance in the factory.
[0021]
【The invention's effect】
In the void member installation method of the hollow slab of Claims 1-3, it is each void member to the side stopper used as the pair provided in the elongate bottom member arrange | positioned in the direction orthogonal to the longitudinal direction of a void member. Can be inserted and the movement in the horizontal direction can be prevented, so that the void member can be easily positioned by simply inserting it into the pair of side stoppers. It is simple and can improve the work of bar arrangement.
In particular, in this void slab void member installation method, a buoyancy receiving reinforcing bar is arranged on the upper surface of the void member, a pressing member is provided on two adjacent buoyancy receiving reinforcing bars, and the pressing member is slabd via a floating hook bolt. Since it can be tightened and fixed from the lower side of the formwork, it is possible to reliably prevent the void member and the like from being lifted up during the concrete placement, and thereby to produce a hollow slab with good quality.
In this void slab void member installation method, positioning can be performed simply by placing the buoyancy receiving reinforcing bars on the paired side stoppers, so that the positioning work of the buoyancy receiving reinforcing bars becomes extremely easy.
[0022]
In the void member installation method of the hollow slab according to claim 2 , since the upper end reinforcing bar is used as the pressing member, it is not necessary to separately prepare the pressing member, so that the manufacturing cost can be reduced.
In the void slab void member installation method according to the third aspect , since the side stopper is formed of a steel bar, it is lightweight and easy to process, and as a result, the manufacturing cost can be further reduced.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of a reinforced concrete hollow slab manufactured by applying a hollow slab void member installation method according to an embodiment of the present invention.
FIG. 2 is a front sectional view of a reinforced concrete hollow slab manufactured by applying the void slab void member installation method.
FIG. 3 is a front view of a positioning fitting used in the void member installation method for the hollow slab.
FIG. 4 is a side view of a positioning fitting used in the void member installation method for the hollow slab.
5 is a cross-sectional view taken along the line II in FIG.
6 is a cross-sectional view taken along the line II-II in FIG.
7 is a cross-sectional view taken along the line III-III in FIG.
[Explanation of symbols]
10: Hollow slab, 11: Slab formwork, 12: Lower end reinforcing bar, 13: Hollow pipe (void member), 14: Upper end reinforcing bar, 15: Concrete, 16: Lower end reinforcement bar, 17: Lower end main reinforcing bar, 18: Positioning Metal fitting, 19: Positioning space part, 20: Bottom bar (bottom member), 21: Side stopper, 22: Buoyancy receiving bar, 23: Balance rod (pressing member), 24: Hook, 25: Lifting hook bolt, 26: Male screw Part: 27: lower surface, 28: flange part, 29: male thread part, 30: foam tie, 31: flange, 32: regicon, 33: connecting metal fitting, 34: connecting metal fitting, 35: hook part, 36: hook part, 37 : Hook part, 38: Hook part, 39: Upper main muscle, 40: Upper end reinforcement

Claims (3)

In the void member installation method for a hollow slab made of reinforced concrete, which is manufactured by placing concrete after placing the lower end rebar, a plurality of void members arranged in parallel and the upper end rebar sequentially on the slab formwork,
A long bottom member arranged in a direction orthogonal to the longitudinal direction of the void member, and a horizontal member provided on the bottom member and capable of inserting the respective void member and orthogonal to the longitudinal direction of the inserted void member A plurality of positioning brackets provided with a pair of side stoppers capable of preventing movement in the direction are provided on the lower end reinforcing bar ,
A buoyancy receiving reinforcing bar is arranged on the upper surface of the void member inserted into the positioning fitting in a direction perpendicular to the longitudinal direction of the void member, and on two adjacent buoyancy receiving reinforcing bars in a direction perpendicular to the buoyancy receiving reinforcing bar. A holding member is provided, and the holding member is fastened and fixed from the lower side of the slab mold frame via a floating hook bolt, and the upper part of the pair of side stoppers simply mounts the buoyancy receiving reinforcing bar. A void member installation method for a hollow slab, wherein the hollow member is formed in a concave shape capable of preventing horizontal movement . The void member installation method of the hollow slab of Claim 1 WHEREIN: While using the said buoyancy receiving reinforcement as a support stand of the said upper end reinforcement, it uses this upper end reinforcement as the said pressing member, The void member of the hollow slab characterized by the above-mentioned. Installation method. 3. The void slab void member installation method according to claim 1 , wherein the pair of side stoppers are formed of steel bars. 4.

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