JPH0521001U - Bending type precast concrete formwork - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the productivity of the bending type PC formwork of columns and beams. To save labor when building a folding PC formwork at the work site. [Structure] The PC plates 12, 14 and 16 are formed in the same plane shape as the side surface of the beam to be constructed. PC version 12, 1
The net 22 is embedded in the thick portions 4 and 16. PC version 1
A V-shaped notch 26 is formed between the two, 14, and 16. Reinforcing bars 32, 3 on the inner surface of the PC plates 12, 14, 16
Spacers 28 for holding 4 are implanted. The adhesive 30 is applied to the notch 26 to apply the respective PC plates 12, 14, 1
Bend 6 and fix. Reinforcing bars 32, 3 on the spacer 28
Hold 4 [Effect] The productivity can be improved by using the net in the bent portion of each PC plate. Labor saving at the work site can be achieved by performing the bar arrangement at the factory.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bendable precast concrete (PC) formwork that covers the outside of a reinforced concrete column or beam to be constructed and is integrated with the concrete to be placed therein.

[0002]

[Prior Art]

 In recent years, when building columns or beams of reinforced concrete, there has been proposed a PC formwork that functions as a formwork that covers the outside of the columns or beams that are to be built and that is integrated with the concrete to be placed. There is. As this type of PC mold, for example, the one disclosed in JP-A-2-167960 (Int.Cl. E04G 9/08) has been conventionally used.

That is, the conventional PC form provides a form of a pillar and a beam. A plurality of thin plate-shaped PC plates formed in the same plane shape as the outer surfaces of the pillar and the beam are hinged. It is foldably connected via metal fittings. Therefore, in this bending type PC form, the outside of the pillar and the beam can be covered by simply bending it from the hinge fitting, and the labor of the formwork can be saved.

[0004]

[Problems to be solved by the device]

 However, in such a conventional bending type PC form, as described above, a plurality of PC plates are connected to each other through the hinge fittings. For this reason, when molding the PC plate itself, it is necessary to simultaneously hammer in and fix the hinge metal fittings when pouring concrete into the molding die.

However, in driving the hinge metal fittings in this manner, it is necessary to be careful in order to sufficiently fill the concrete around the anchors of the hinge metal fittings and to prevent the concrete from wrapping around the rotating portion of the hinge metal fittings. Will be required, and production efficiency will deteriorate at this point.

Further, in the PC form, even if the hinges are bent to cover the outside of the pillars and beams easily, the main form and the hoops or the stirrup at the construction site are contained in the PC form. It is necessary to arrange the bar. Therefore, when constructing columns and beams using the folding PC formwork, the work of bending and fixing each PC plate on the site and the work of arranging the reinforcement in the PC formwork described above. And the work of placing concrete in this PC formwork. Therefore, it is difficult to say that the on-site work is significantly complicated, and that sufficient labor saving has been achieved, and there is a problem that the shortening of the construction period cannot be achieved.

In view of such conventional problems, the present invention provides a bending type PC formwork capable of improving the productivity of the formwork and reducing the on-site work as much as possible to achieve great labor saving. The purpose is to provide.

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention embeds a plurality of thin plate-shaped PC plates, each of which is formed by dividing the outer surface of a column or beam to be constructed into a planar shape, into the thick parts of these PC plates. The PC plates are connected so as to be bendable via a net, V-shaped cutouts are formed between the PC plates, the cutouts are filled with an adhesive, and the PC plates are bent and fixed, and A spacer for holding the reinforcing bar is provided on the inner surface of the PC plate.

[0009]

[Action]

 In the folding type PC form of the present invention having the above-mentioned configuration, since a plurality of PC plates are connected so as to be bendable via the nets embedded in these thick portions, The productivity can be remarkably improved without requiring strict accuracy control when placing concrete.

Further, since a V-shaped notch is formed between the PC plates, the notch is filled with an adhesive, and the PC plates are bent and fixed, the bonding process is performed in advance at the factory. By doing so, each PC plate will be extended and damaged during transport to the site, and in order to prevent this, it is possible to save the time and effort to maintain the shape of each PC plate with a special jig. At the same time, the strength at the time of transportation can be secured, and further, the assembling work on site can be omitted.

Further, since the spacer for holding the reinforcing bar is provided on the inner surface of the PC plate, it is possible to carry the reinforcing bar to the site in advance in the factory while holding the reinforcing bar in the factory, and omit the rebar work at the site. be able to.

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 4 show a bending type PC form 10 showing a first embodiment of the present invention. The bending type PC form 10 of this first embodiment is an example when used as a form for a beam. To describe. 1 is a sectional view of the folding type PC form 10 in a completed state, FIG. 2 is a development view of the folding type PC form 10, FIG. 3 is an enlarged sectional view taken along line AA in FIG. FIG. 4 is a perspective view showing an embodiment of a spacer used in the present invention.

That is, as shown in FIG. 2, the bending type PC form 10 of the present embodiment has three outer surfaces of the beam to be constructed, that is, three outer surfaces, that is, the bottom surface and both side surfaces, which have the same plane shape. PC plates 12, 14, 16 are provided, and these PC plates 12, 14, 16 are molded by a molding die.

FIG. 5 shows an embodiment of a mold 18 used for manufacturing these PC plates 12, 14 and 16, and at the bottom of the mold 18, there are illustrated planks 20 and 20 having a cross section of a right triangle. In addition to the above arrangement, a net 22 which is located at the top of these face boards 20 and 20 and covers the entire surface of the mold 18 is arranged. This net 22 plays a role as a reinforcing bar for the PC plates 12, 14 and 16. The net 22 may be a wire net, but it prevents rust due to lack of concrete cover thickness, and especially bends A fiber material such as aramid fiber, vinylon fiber, carbon fiber, glass fiber, etc., which is relatively flexible and has high tensile strength and can be made lightweight in order to ensure good bendability at the time Preferably. Then, concrete 24 is poured into the mold 18 and hardened to embed the net 22 in the wall thickness of the PC plates 12, 14 and 16, and the nets 22 are used to make the PC plates 12, 14 respectively. , 16 are connected, and these PC plates 12, 14, 16 are manufactured. In addition, V-shaped notches 26 and 26, which are shown in detail in FIG. 3, are formed between the PC plates 12, 14 and 16 in the face boards 20 and 20. The PC plates 12, 14, and 16 shown in FIG. 5 have a reverse relationship to the one shown in FIG.

By arranging the spacers 28, 28 ... At the bottom of the mold 18, these spacers 28, 28 ... As shown in FIG. 2 when the PC plates 12, 14, 16 are completed. , Are planted on the inner surface (upper surface in FIG. 2) of each PC plate 12, 14, 16. The spacer 28 is made of metal or synthetic resin, and is embedded in the PC plate 12, 14, 16 and the rebar holding portion 28a that can be projected and expanded from the PC plate 12, 14, 16 as shown in FIG. And an anchor portion 28b.

In the illustrated example, the planks 20, 20 and the spacers 28, 28 ... Are arranged in the lower part, and the concrete 24 is poured from above, but on the contrary, the concrete 24 is placed. The face plates 20, 20 and the spacers 28, 28 may be arranged from above to produce the PC plates 12, 14, 16.

In the folding PC form 10 having such a configuration, the adhesive 30 is applied to the inside of the V-shaped notches 26, 26, and the respective PC plates 12, 14, 16 are bent and Each of the ends is fixed to each other, and has a U-shaped cross section that covers the outside of the beam to be constructed as shown in FIG. The adhesive 30 is preferably a high-strength adhesive in order to integrate the PC plates 12, 14, and 16, and examples thereof include vinyl acetate resin, acrylic resin, polyurethane resin, polyester resin, polyester resin, and epoxy resin. Resin, synthetic rubber adhesive, etc. are available. Further, the application range of the adhesive 30 may extend over the entire length of the notches 26, 26, or may be partially intermittent.

Further, when the PC plates 12, 14, 16 are assembled in a U-shaped cross section, the spacers 28, 28 ... Therefore, the beam main bars 32, 32, ... And the stirrup 34 can be attached to the spacers 28, 28 in this state. In this embodiment, the stirrup 34 is attached to the spacers 28, 28 ... And the stirrup 34 is sandwiched and held by the reinforcing bar holding portions 28a of the spacers 28, 28.

In the folding type PC form 10 of the present embodiment having the above-mentioned structure, the net 22 is embedded in the wall thickness of the PC plates 12, 14, 16 covering the bottom surface and both side surfaces of the beam. Since the PC plates 12, 14, 16 are connected to each other through the net 22, the PC plates 12, 14, 16 are folded from the V-shaped notches 26, 26 using the net 22 as a hinge. Can be bent. Therefore, when placing the concrete 24 on the mold 18, it is not necessary to strictly control the accuracy of the bent portions between the PC plates 12, 14, 16 and the productivity of these PC plates 12, 14, 16 is improved. Can be significantly improved.

Further, since the V-shaped notches 26, 26 are formed between the PC plates 12, 14, 16 and the respective end portions are bent and fixed with the adhesive 30 therebetween, This bonding step can be performed in advance in the factory. In this way, if the adhesive 30 is filled in the notches 20, 20 and hardened, the PC form 10 will be lengthened and damaged during transportation to the site, and in order to prevent this. It is possible to save the labor of keeping the shape of the PC plates 12, 14 and 16 with a special jig or the like, and also to secure the strength during transportation. Then, by carrying in and using the bending type PC formwork 10 which is bent and adhered to a predetermined shape to the construction site, the work of bending and assembling the PC plates 12, 14 and 16 at the site can be omitted. You can

Further, since spacers 28, 28 ... For holding the reinforcing bars such as the beam main bars 32 and the star laps 34 are planted on the inner side surfaces of the PC plates 12, 14, 16, the spacers 28, 28 ... Further, the beam main bars 32 and the stirrup 34 can be carried into the site while being held in the factory. Therefore, the work of arranging the inside of the bending type PC form 10 can be omitted at the site.

Therefore, the foldable PC form 10 of this embodiment can be directly erected at the construction position of the beam when it is carried into the site, and thereafter the foldable PC form 10 can be installed. It is only necessary to place a concrete on the concrete, and significant labor saving can be achieved. The V-shaped notch 26 described above has a bendability by forming a small V-shaped groove 26a at the back side position corresponding to the position where the notch 26 is formed as shown in FIG. It is possible to improve the appearance of the corners when the PC plates 12, 14 and 16 are bent by preventing the concrete from peeling off from the bent portion due to bending.

FIG. 7 shows a folding PC form 10a showing a second embodiment of the present invention used as a column form, and even this folding PC form 10a is substantially the same as the first embodiment. It can be configured similarly.

That is, in this embodiment, four PC plates 40, 42, 44, 46 having the same plane shape as the outer surfaces of the pillar to be constructed are formed by embedding the net 22 in the thick portion. To do. Then, the PC plates 40, 42, 44 and 46 are bent from a V-shaped notch provided between them, and their ends are joined together with an adhesive 30. At this time, each PC plate 40, 42, 44, 46 forms a rectangular closed cross section.

Further, spacers 28, 28 ... Are planted inside the respective PC plates 40, 42, 44, 46, and column spacers 48, 48 ... Hold the rebar consisting of 50 ...

Therefore, even in the second embodiment, as in the first embodiment, the parts from the bonding to the reinforcing bar holding are constructed in the factory, so that the bending and assembling and the bar arrangement are performed on site. It can be omitted. After the folding PC form 10a has been carried into the site, it is only necessary to insert it into the outer periphery of the steel frame 52 and place concrete, which can greatly save labor and shorten the construction period. And

[0027]

[Effect of the device]

 As described above, in the folding PC formwork of the present invention, a plurality of thin-walled plate-shaped PC plates formed in a flat shape by dividing the outer surface of the column or beam to be constructed are used. Since it is connected via a net embedded in the thick part so that it can be bent, strict accuracy control is not required when placing concrete in the bent part, and productivity can be significantly improved. Therefore, the construction cost can be reduced.

In addition, a V-shaped cutout is formed between the PC plates, the PC plate is bent by filling the cutouts with an adhesive, and the spacers provided on the inner surface of the PC plate are provided with reinforcing bars. By holding the work in advance at the factory, each PC plate will develop for a long time when it is transported to the site and it will be damaged. It is possible to save the time and effort required to maintain the shape, to secure the strength during transportation, and also to achieve significant labor saving at the construction site, which further reduces the construction cost and significantly reduces the construction period. It has various excellent effects that can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a development view showing a first embodiment of the present invention.

FIG. 3 is an enlarged sectional view taken along line AA in FIG.

FIG. 4 is a perspective view showing an embodiment of a spacer used in the present invention.

FIG. 5 is a cross-sectional view showing an embodiment of a mold used when molding the PC plate of the present invention.

FIG. 6 is a sectional view corresponding to FIG. 3, showing another embodiment of the present invention.

FIG. 7 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

10 Bending type PC form 10a Bending type PC form 12 PC version 14 PC version 16 PC version 18 type 22 Net 24 Concrete 26 Notch 28 Spacer 30 Adhesive 32 Beam main bar 34 Stirrup 40 PC version 42 PC version 44 PC version 46 PC version 48 Column main muscle 50 Hoop muscle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location E04G 13/02 6935-2E 13/04 6935-2E (72) Creator Haruka Ogawa Kiyose City, Tokyo 4-640 Shimoseido Inside Obayashi Technical Research Institute Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A plurality of thin plate-shaped precast concrete slabs, each of which is formed by dividing the outer surface of a column or beam to be constructed into a planar shape, through a net embedded in the thick part of these precast concrete slabs. The precast concrete slabs are foldably connected to each other, V-shaped cutouts are formed between the precast concrete slabs, the cutouts are filled with an adhesive, and the precast concrete slabs are bent and fixed, and the precast A bendable precast concrete formwork, characterized in that a spacer for holding the reinforcing bars is provided on the inner surface of the concrete slab.