JP2001164688A - Precast concrete beam material, precast concrete floor board and building construction method for reinforced concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete beam material enabling easy formation of a placing-joint form, preventing cracking in a concrete at a placing-joint portion and improving the quality of a concrete placed on a precast concrete floor plate, and to provide the precast concrete floor plate and a building construction method for a reinforced concrete structure. SOLUTION: The precast concrete beam material 1, wherein the upper part of a stirrup 3 is protruded from the upper face of a concrete member 2 and upper end bars 4 are arranged on the protruded portion, has a form portion 8 formed at both ends of the upper face to form a placing-joint form 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete beam, a precast concrete floor plate, and a method of constructing a reinforced concrete structure.

[0002]

2. Description of the Related Art In order to construct a super high-rise building made of reinforced concrete, the concrete strength of columns is important, and joints between the columns, beams and floors are jointed as shown in FIG. A formwork 44 is formed and concrete 46 having the same high strength as the pillar 45 is cast therein. As shown in (2) and (3) in the figure, the concrete 46 is cast by inserting an air tube 49 between the column 45 and the slab, or between the column 45 and the beam 47. To form a joint formwork 44.

[0003]

However, the above construction method has the following problems. In order to construct the joint form for beams and floors on site, the number of working steps is increased. When a vibrator is applied to the concrete cast in the joint, concrete leaks from between the air tubes forming the formwork, and it has been difficult to confirm the solidity of the concrete. After the concrete is cast on the joint form and before the concrete on the beams and floor is cast, the worker dismantles the joint form on the slab reinforcement. Cracks occur in the concrete of the part. The work of lifting and lowering a mold forming material such as an air tube is increased. When finishing the concrete at the joint, the constructor moves on the slab reinforcement, and cracks are generated in the concrete at the joint through the rebar. Since the finisher of the concrete at the joint is performed on the cast concrete of the beam and floor before hardening, the quality of the concrete deteriorates. Since the main reinforcement of precast concrete beams is prepared on site, mistakes such as the number of precast concrete beams are likely to occur. Dangerous main rebar movement work had to be performed on precast concrete beams erected between the columns, and if the main rebar had a large diameter, it was difficult to move.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the simple formation of a jointed formwork, the prevention of the occurrence of cracks in jointed concrete, and the casting of precast concrete floorboards. An object of the present invention is to provide a method for constructing a precast concrete beam, a precast concrete floor plate, and a reinforced concrete structure capable of improving the quality of concrete.

[0005]

According to a first aspect of the present invention, an upper stirrup is projected from an upper surface of a concrete member, and an upper end bar is arranged at the projected portion. In the precast concrete beam material, a formwork forming portion forming a joint formwork is formed at both ends of the upper surface.

According to the first aspect of the present invention, when the precast concrete beam is erected between the columns, a joint form is formed around the columns by the form forming portion.

According to a second aspect of the present invention, in the first aspect, the mold forming portion is formed by protrusions provided on both ends of the upper surface.

[0008] According to the second aspect of the present invention, the template forming portion is formed by the projecting portions only at both ends of the upper surface of the concrete member.

According to a third aspect of the present invention, in the first aspect, the mold forming portion is formed by protrusions provided from the center of the upper surface to both ends.

According to the third aspect of the present invention, it is possible to form the template forming portion by the protruding portions only at both ends of the upper surface of the concrete member, and to cast concrete into the center of the upper surface of the concrete member. Can be omitted.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the lower end streaks and the top end portions of the upper end streaks protrude from the cut surface.

According to the fourth aspect of the present invention, the column, the precast concrete beam member and the precast concrete floorboard can be easily joined by the distal ends of the lower and upper reinforcing bars.

According to a fifth aspect of the present invention, a form forming part forming a joint form is formed on a part of the upper surface of the concrete plate.

According to the fifth aspect of the present invention, when the precast concrete floorboard is laid between the precast concrete beams, the joint formwork can be formed around the columns and beams by the form forming portion.

According to a sixth aspect of the present invention, in the fifth aspect, the mold forming portion is formed by a projection provided on the upper surface of the concrete plate.

According to the sixth aspect of the present invention, the splicing form by the projection is formed at the corner or the side and the corner and the side of the concrete plate.

According to a seventh aspect of the present invention, a form forming portion forming a joint form is formed on the upper surface of the concrete plate.

According to the invention of claim 7, it is possible to omit the operation of placing concrete in portions other than the form forming portion.

According to an eighth aspect of the present invention, in the seventh aspect, the mold forming portion is formed by a projection provided on the upper surface of the concrete plate.

According to the eighth aspect of the present invention, the template forming portion is formed by the protrusion only on a part of the upper surface of the concrete plate.

According to a ninth aspect of the present invention, in accordance with the seventh aspect, the mold forming portion is formed by casting concrete having a predetermined thickness on the upper surface of the concrete plate excluding the mold forming portion. Features.

According to the ninth aspect of the present invention, the template forming portion can be formed by a projection on a part of the upper surface of the concrete plate, and the operation of placing concrete on the center of the upper surface of the concrete plate is omitted. be able to.

According to a tenth aspect of the present invention, a precast concrete beam member having formwork forming portions on both ends of the upper surface is erected between columns to form a beam, and a formwork forming portion is formed on the upper surface between these beams. Laying precast concrete floorboards with
It is characterized in that concrete is poured into the joint formwork constituted by the form forming part.

According to the tenth aspect of the present invention, the precast concrete beam material and the preform concrete floor slab forming portion allow the splice form to be easily formed around the columns and beams, and to be spliced. Cracks can be prevented from occurring in the concrete, and the quality of the concrete cast on the precast concrete floor can be improved.

According to an eleventh aspect of the present invention, in the tenth aspect, concrete having the same strength as the concrete to be cast on the pillar is cast in the joint formwork.

According to the eleventh aspect of the present invention, the joint between the column, the precast concrete beam member and the precast concrete floor plate is strengthened.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The precast concrete beam (hereinafter referred to as PC beam), the precast concrete floorboard (hereinafter referred to as PC floorboard), and the method of constructing a reinforced concrete structure (hereinafter referred to as the structure construction method) of the present invention will be described below. Embodiments will be described with reference to the drawings. First, an embodiment of a PC beam material and a PC floorboard will be described, and thereafter, an embodiment of a construction method of a structure will be described.

There are first and second embodiments of the PC beam material. FIG. 1 is a perspective view of the PC beam material of the first embodiment, and FIG. 2 is a perspective view of the PC beam material of the second embodiment. FIG.

As shown in FIG. 1, a PC beam 1 according to the first embodiment is a precast concrete member (hereinafter referred to as PC).
The upper part of stirrup 3 protrudes from the upper surface of 2)
The upper end muscle 4 and the lower end muscle 5 are arranged here.
Have protruded from the kiguchi surface 6. Formwork forming portions 8 are formed on both ends of the upper surface of the PC member 2 by protrusions 7 having a height covering the stirrups 3. The protruding portion 7 is formed to be slightly narrower than the horizontal width of the upper surface, and mounting portions 9 for PC floor boards are formed on both sides thereof.

The PC beam 10 of the second embodiment is similar to the PC beam 10 shown in FIG.
As shown in the figure, on both ends of the upper surface of the PC member 2 similar to the above, a mold forming portion 8 is formed by protrusions 11 extending from the center to both ends, and cotters 12 are formed on both sides of the protrusions 11. Are formed. This PC beam member 10 has a protrusion 1
The configuration other than 1 is the same as that of the first embodiment.

FIGS. 3 to 5 show an embodiment of a PC floorboard. FIG. 3 is a perspective view of the PC floorboard of the first embodiment.
FIG. 4 is a perspective view of the PC floorboard of the second embodiment, and FIG. 5 is a perspective view of the PC floorboard of the third embodiment.

The PC floorboard 13 of the first embodiment is similar to that of FIG.
As shown in (1), a so-called half PC floorboard 14 is provided with formwork forming portions 15 at four corners. The half PC floorboard 14 is formed from the upper surface of the concrete board 16.
The upper portion of the truss bar 20, which is formed by connecting one upper bar bar 17 and two lower bar bars (not shown) with a corrugated lattice bar 19, protrudes, and a space 21 for casting cast-in-place concrete is formed on the upper surface. It refers to what has been formed. Also, the mold forming unit 1
5 is formed in a plane triangular shape by a projecting portion 22 of a plane triangular full precast concrete, in which a truss bar 20 is not arranged, but a joint groove 2 with a pillar is provided at the tip.
3 are formed. On the other hand, the truss 2
0 is buried and the bending reinforcement 24 is arranged.
The projection 22 is not limited to a planar triangle as shown in (1), but may be a planar rectangular projection 25 as shown in (2).

The PC floor board 26 of the second embodiment is similar to the PC floor board shown in FIG.
As shown in the figure, a so-called full PC floor panel 27 is formed with flat triangular step-shaped mold forming portions 28 at four corners. The full PC floorboard 27 is completed in all parts except the form forming part 28, that is, the full precast part 2
9 means the mold forming part 28
Only cast-in-place concrete is to be cast. The form forming portion 28 has the same triangular shape as the above, and the truss bars 20 are not arranged here, but the joining groove 23 with the pillar is formed at the tip. Also, cotters 30 are provided on four side surfaces of the full PC floorboard 27.

The PC floor board 31 of the third embodiment is similar to the PC board shown in FIG.
As shown in FIG. 5, stepped frame forming portions 33 and 34 are formed at four corners and four side portions of a so-called full PC floor plate 32. The full PC floorboard 32 is the same as described above, and includes a form forming portion 33 at four corners and a form forming portion 34 at four sides by a protrusion 36 extending from a full precast portion 35 at the center.
Are formed. The truss bars 20 and the bending reinforcing bars 24 extending from the full precast portion 35 are arranged in these form forming portions 33 and 34, and the same joining grooves 23 as those described above are provided at the tips of the form forming portions 33 at the four corners. Are formed.

FIGS. 6 to 11 show the PC beams 1 and 1 described above.
FIGS. 6A and 6B show first to third embodiments of a construction method of a structure using the PC floorboards 13, 26, and 31. FIG. 6 is a plan view of the construction method of the structure of the first embodiment. Sectional view,
FIG. 8 is a plan view and a sectional view of a construction method of a structure according to the second embodiment, and FIG. 10 is a plan view and a sectional view of a construction method of the structure according to the third embodiment.

The construction method of the structure of the first embodiment is as follows.
As shown in FIG. 6, the PC beam 1 shown in FIG. 1 and the PC floorboard 13 shown in FIG. 3 are used, and precast concrete members 1 and 13 manufactured in advance in a factory are brought into the site and assembled. First, columns 37 of high strength (600 kg / m ² or more) are constructed from cast-in-place concrete, and the PC beam 1 is erected between these columns 37. Next, when the PC floor plate 13 is laid between the PC beam members 1, the formwork forming portion 8 of the PC beam member 1 and the formwork forming portion 15 of the PC floor plate 13 form a joint formwork 38 around each column 37. Is formed. On the other hand, as shown in FIG.
The distal end of the lower muscle 5 is arranged and joined to the pillar.

Next, concrete 39 having the same strength as the column 37 is cast into the joint formwork 38, and the column 37 and the PC beam 1
And the joint part 40 with the PC floorboard 13 is formed.
Then, the finisher of the joint portion 40 is mounted on the projection 7 of the PC beam 1 and the projection 11 of the PC floor panel by the constructor, and before the concrete 39 is hardened, the PC beam 1 In the remaining space 21 with the PC floor plate 13, concrete 41 having lower strength than the concrete 39 of the pillar is poured and a slab 42 of a predetermined floor is constructed. The reinforced concrete structure is constructed by sequentially repeating such work for each floor.

The construction method of the structure according to the second embodiment is as follows.
As shown in FIG. 8, the PC beam 10 of FIG.
A floor board 26 is used, and the construction is performed in the same manner as described above except that the floor board 26 is used. In this case, PC beam 10
Is installed between the columns 37, and the PC
When the floorboard 26 is laid, a joint formwork 38 is formed around the column 37 by the formwork forming parts 15 and 28 in the same manner as described above.
When the same concrete 39 as the column 37 is poured into the joint formwork 38, the slab 42 on the predetermined floor is constructed. Therefore, since the finisher of the joint portion 40 can be carried out on the full precast portion 29 by the builder, cracks can be prevented from being generated in the joint portion 40 and the quality of the PC floor board 26 can be reduced. Can be improved,
Moreover, casting of cast-in-place concrete other than here can be omitted. The structure of the joint between the column 37 and the PC beam 10 is the same as described above, as shown in FIG.

The construction method of the structure according to the third embodiment is as follows.
As shown in FIG. 10, the PC beam 1 of FIG.
A floor plate 31 is used, and the construction is performed in the same manner as described above except that the floor plate 31 is used. In this case, the PC beam 1 is installed between the columns 37, and the PC floor plate 3 is interposed between the PC beams 1.
1 lays the formwork forming part 33 around the columns and beams,
34, the same concrete 39 as the column is cast in the joint formwork 38 around the column, and the same concrete as the PC floorboard 31 in the joint formwork 43 around the beam. A slab 42 of a predetermined floor is constructed by casting 41. Therefore, the finisher of the joint 40 is carried out by the full precast part 3 in the same manner as described above.
5, so that cracks can be prevented from occurring in the spliced portion 40 and the PC
The quality of the floorboard 31 can be improved. Pillar 3
The structure of the joint between the PC beam 7 and the PC beam 1 is the same as described above, as shown in FIG.

The construction method of the structure is not limited to the combination described above, and the PC beams 1, 10 and the PC floor plate 13,
26 and 31 can be freely combined.

[0041]

According to the present invention, when a precast concrete beam is erected between columns, a splicing form by a form forming portion can be easily formed around the column.

It is possible to form the template forming portion by the projections only at both ends of the upper surface of the concrete member, and it is possible to omit the operation of placing the concrete on the concrete member.

The column and the PC beam can be easily joined by the distal ends of the lower and upper muscles.

By laying the PC floor plate between the PC beam members, the joint formwork by the form forming portion can be easily formed around the columns and beams.

A splicing form can be formed at the corners or sides, and at the corners and sides, of the concrete plate.

The operation of placing concrete on portions other than the form forming portion can be omitted.

A template forming portion can be formed on a part of the upper surface of the concrete plate by the projection.

The formwork forming section of the PC beam material and the PC floorboard makes it possible to easily form the joint formwork around the columns and beams, and to prevent cracks from occurring in the joint concrete. In addition, the quality of the concrete cast on the PC floorboard can be improved.

The connection between the column, the PC beam material and the PC floor plate is strengthened.

There is no erroneous installation of the main reinforcement in the PC beam material.

It is possible to omit the operation of moving the main reinforcing bar on the PC beam erected between the columns.

[Brief description of the drawings]

FIG. 1 is a perspective view of a PC beam according to a first embodiment.

FIG. 2 is a perspective view of a PC beam according to a second embodiment.

FIG. 3A is a perspective view of a PC floor panel according to the first embodiment, and FIG. 3B is a perspective view of a main part of the PC floor board.

FIG. 4 is a perspective view of a PC floor panel according to a second embodiment.

FIG. 5 is a perspective view of a PC floor panel according to a third embodiment.

FIG. 6A is a plan view of the construction method of the structure according to the first embodiment, and FIG. 6B is a sectional view of the same.

FIG. 7 is a perspective view of a main part of the construction method of the structure according to the first embodiment.

FIG. 8A is a plan view of a construction method of a structure according to a second embodiment, and FIG. 8B is a sectional view of the same.

FIG. 9 is a perspective view of a main part of a construction method of a structure according to a second embodiment.

FIG. 10 is a plan view of a construction method of a structure according to a third embodiment, and FIG. 10 is a sectional view of the same.

FIG. 11 is a perspective view of a main part of a construction method of a structure according to a third embodiment.

FIG. 12 (1) is a front view showing a conventional construction method of a structure, and (2) and (3) are sectional views thereof.

[Explanation of symbols]

 1, 10 PC beam material 2 PC member 3 Stirrup 4, 17 Upper streak 5 Lower streak 6 Kiguchi surface 7, 11, 22, 25, 36 Projection 8, 15, 28, 33, 34 Formwork forming section 9 Part 12, 30 Cotta 13, 26, 31 PC floor plate 14 Half PC floor plate 16 Concrete plate 19 Lattice streak 20 Truss streak 21 Space 23 Joint groove 24 Bending reinforcement 27, 32 Full PC floor plate 29, 35 Full precast part 37, 45 Column 38, 43, 44 Joint formwork 39, 41, 46 Concrete 40 Joint part 42 Slab 47 Beam 48 Floor

Continued on the front page (72) Inventor Tohru Hyuga 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Tokyo Branch (72) Inventor Naoki Sakurada 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Masanobu Watanabe 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Intra-company Tokyo Branch (72) Inventor Hirokazu Ihara 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Nobuyuki Izumi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd.

Claims (11)

[Claims] 1. A precast concrete beam material having a stirrup protruding from an upper surface of a concrete member and having an upper end bar arranged at the protruding portion, wherein a formwork is formed at both ends of the upper surface. A precast concrete beam material having a forming portion formed. 2. The precast concrete beam according to claim 1, wherein the formwork forming portion is formed by protrusions provided on both ends of the upper surface. 3. The precast concrete beam material according to claim 1, wherein the formwork forming portion is formed by a projection provided from a central portion of the upper surface to both end sides. 4. The precast concrete beam material according to claim 1, wherein the distal ends of the lower streaks and the upper streaks protrude from the tip of the wood. 5. A precast concrete floorboard, wherein a formwork forming part forming a joint formwork is formed on a part of the upper surface of the concreteboard. 6. The mold forming part is formed by a projection provided on an upper surface of a concrete plate.
A precast concrete floor panel according to claim 1. 7. A precast concrete floor panel, wherein a formwork forming part forming a joint formwork is formed on an upper surface of the concrete board. 8. The formwork forming portion is formed by a protrusion provided on the upper surface of the concrete plate.
A precast concrete floor panel according to claim 1. 9. The precast concrete according to claim 7, wherein the mold forming part is formed by casting concrete having a predetermined thickness on the upper surface of the concrete plate excluding the form forming part. Floorboard. 10. A precast concrete beam member having a form forming portion on both ends of an upper surface of a concrete member is erected between columns, and a form forming portion is formed on the upper surface of a concrete plate between these precast concrete beam members. A method of constructing a reinforced concrete structure, comprising: laying a precast concrete floor panel provided with a concrete structure; and placing concrete in a joint form formed by the form forming part. 11. The method of constructing a reinforced concrete structure according to claim 10, wherein concrete having the same strength as the concrete to be cast on the column is cast in the joint formwork.