JP2586224B2 - Building method using precast concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete column form member, a precast concrete beam form member, and a precast concrete column / beam joint block constructed using a precast concrete column / beam joint block. The present invention relates to a method for building a skeleton using a form member.

[0002]

2. Description of the Related Art Conventionally, when constructing a reinforced concrete building, first, a column reinforcement pre-assembled for column construction is attached to a construction site, and a column form is set so as to cover the column reinforcement. The concrete was cast to construct the columns, and the latter half of the precast beam members were arranged so as to bridge between the constructed columns, beam beams were installed inside the beam members, and then the beam concrete was removed. I was going to cast it. Then, the building was constructed by performing such work for each floor. In particular, the connection between the column reinforcement on the lower floor and the column reinforcement on the upper floor in the panel zone, and the connection between the beam reinforcements intersecting horizontally,
It was common to use gas pressure welding.

[0003]

However, in such a conventional method, since various types of reinforcing bars are joined by pressure welding, a plurality of reinforcing bars must be pressed one by one, which is a great deal of work. It takes a long time to complete the process, and the use of fire causes safety problems. In addition, this pressing work requires skill, and the pressing work cannot be performed in the rain, so that the joining work depends on the weather, and this also requires a long construction period.

[0004] In addition, since a mold such as a plywood plate is used, waste materials are generated and a formwork is also required.

Further, when constructing a pillar, concrete is poured from above into the pillar formwork, so that it is difficult to cast concrete uniformly from the bottom to the top of the pillar, and junkers are formed inside. There is a problem that the strength is reduced. On the other hand, in consideration of this point, it is conceivable to secure the quality by constructing the column member with a solid precast concrete member, but a large lifting machine or the like is required for on-site construction, which is not preferable.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has an object to provide a method of constructing a skeleton using a precast concrete form member capable of efficiently constructing a high-quality reinforced concrete building. And

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a hollow cylindrical body, in which a reinforcing bar and a hoop bar are buried in a thick portion and a concrete inlet is formed in a lower end portion. Precast concrete column form member, and a precast concrete beam form member formed in a U-shaped cross section with an open upper part, and a beam main reinforcement projecting to a column / beam connection portion is embedded in a thick portion. A member, a column main reinforcement inserted into the hollow portion of the column form member, and a U of the beam form member.
Precast concrete column and beam connection block body with connecting beam main reinforcement to be inserted into the U-shaped groove,
Next, the column form member is erected over the existing column main reinforcement, and then the block body is inserted into the hollow portion of the column form member so that the column main reinforcement abuts against the existing column main reinforcement. While placing on the top of the column form member,
On the side of the block, the beam form member is disposed while the beam main reinforcement is superimposed on the connecting beam main reinforcement, and then, a disposal form is disposed between the beam form member and the block body. Then, concrete is press-fitted into the hollow portion of the column form member from the injection port of the column form member, and concrete is poured into the beam form member and the disposal form.

In the present invention, the precast concrete column / beam joint block may include a steel frame member inserted into a U-shaped groove of the beam form member instead of the connecting beam main reinforcement. It is characterized by.

Further, the present invention is characterized in that the waste form is formed of a steel plate material.

[0010]

The operation of the present invention will be described in detail. A precast concrete form member and a precast concrete form member in which the columns, beams, and members constituting the column / beam joints constituting the reinforced concrete building can be directly applied as structural materials. The unit is manufactured in advance in a factory, and these units are carried to a construction site so that construction work can be performed. Therefore, construction can be performed efficiently. In particular, no waste material is generated as in the case of constructing a formwork with plywood, and no formwork is required, so that resources and labor can be saved, and demolding work is omitted. Can also. In addition, since the column form members and beam form members having a large outer shape are almost semi-precast members and are lightweight, there is no need for a large-capacity lifting machine or the like when carrying in or building these members at the construction site. .

Regarding the joining of the reinforcing bars, the reinforcing bars of the columns are buried in the column form member, and the reinforcing bars and the reinforcing bars of the column form a lap joint structure. The transfer of stress between them can be achieved by this lap joint structure, so that the connection between the main pillars can be a simple butt structure. With such a configuration, it is possible to efficiently complete the construction in a short period of time by reducing the press-joined portions. In addition, it is possible to reduce the number of places where fire is used, so that it is safe and less affected by the weather.

Further, concrete is poured into the column form member from the injection port formed at the lower end of the column form member, so that the concrete is evenly inserted into the hollow portion of the column form member. It can be filled, and it is possible to prevent the occurrence of jumper and to sufficiently secure the strength as a structural material.

Further, the building constructed according to the present invention has a so-called ramen structure. In this case, a short-term stress such as an earthquake is greatly applied to both ends of the beam. Because steel frame material was adopted for the connection of
Excellent proof stress against such short-term stress can be exhibited.

[0014] Further, by removing the formwork to be disposed between the block body and the beam formwork member as a discarded formwork, it is possible to eliminate the demolding work and improve the construction efficiency. Since a steel plate is used as the waste formwork, the short-term stress described above and thus the structural strength can be made sufficiently strong.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 show an embodiment of a method for building a skeleton according to the present invention, FIG. 1 is an explanatory view showing a building process according to the present invention, and FIG. 2 is a connection state between a column and a beam-to-column connection. 3, FIG. 3 is an enlarged sectional view taken along line BB in FIG. 1, FIG. 4 is an enlarged sectional view taken along line AA in FIG. 1, and FIG. 5 is an enlarged perspective view of a beam-to-column connection. It is.

FIG. 1 shows precast concrete (hereinafter referred to as precast concrete).
Abbreviated as PC. 3) shows a process of installing the column formwork member 10, the PC beam form member 12, and the PC column / beam joint block 30. The PC column form member 10 is shown in FIG.
As shown in FIG. 3, for example, a hollow cylindrical body having a rectangular cross section is manufactured by a centrifugal molding method, and a plurality of reinforcements 14 arranged in the length direction within the thickness thereof, and the reinforcements are provided. A plurality of hoops 16 are buried around the outside of the hoop 14 and arranged at equal intervals in the length direction. Also, a concrete injection port 1 is provided on the lower side surface of the PC column form member 10.
7 is formed.

As the PC beam forming member 12, for example, a member manufactured using a centrifugal forming form device is used.
As shown in FIG. 4, the PC beam form member 12 is formed in a U-shaped cross section with an open top, and its length is shorter than the span between a pair of columns to be bridged. . In the thickness of the PC beam form member 12, a plurality of lower beam main reinforcing bars 18 are buried in the length direction, and a plurality of stirrups 20 are partially protruded upward at upper end portions from the thick portions. Buried. On the upper side of the PC beam form member 12, an upper beam main reinforcement 2 is in contact with the inside of the stirrup 20.
2 and the upper beam main reinforcement 22 and the lower beam main reinforcement 1
8 project from both ends of the PC beam form member 12. The upper beam main reinforcement 22 may be attached at the site after the PC beam form member 12 is formed.

The PC column form member 10 and the PC beam form member 12 are preliminarily manufactured in a factory or the like, carried into the site, and suspended and built with a crane or the like. First, the column-shaped frame member 10 made of PC is erected. A plurality of column main bars 26 are erected from the floor slab 24 at this erected position.
The pillar forming frame member 10 is erected. The length of the column main bar 26 erected from the floor slab 24 is the length of the PC column form member 10.
Is formed as approximately half the length of. Further, as is generally performed when the PC column form member 10 is erected, the PC column form member 10 is not supported until the final concrete casting step is completed and hardened. Is held by the supporting member.

Further, as shown in FIG. 5, the block body 30 is formed on a concrete block 32 by projecting in a vertical direction into a plurality of pillar main reinforcements 34 inserted into the hollow portion S of the PC column form member 10 and a beam of the beam. It is constituted by driving a plurality of connecting beam main reinforcing bars 36 which are inserted in the U-shaped grooves of the PC beam form member 12 protruding in the arrangement direction. The block body 30 is manufactured in advance at a factory or the like.

The block body 30 is suspended by a crane or the like, and the lower part 34a of the column main bar 34 is inserted into the hollow portion S of the PC frame member 10 from above. Strut 1 embedded in column form member 10
The block body 30 is placed on the upper part of the PC column form member 10 so that the blocks 4 and 4 are superimposed on each other. In addition, the column main reinforcement 34
Of the lower portion 34a and the upper portion 34b of the
The column main bar lower portion 34a is formed to be half the length of the C column form member 10, and when the column main bar lower portion 34a is inserted into the hollow portion S, the column main bar lower portion 34a stands upright from the floor slab 24.
6 and are arranged in abutting relationship.

On the other hand, the PC beam form member 12 is disposed between the pair of PC column form members 10, and is disposed on the side of the block body 30 using the support H. At this time, an interval L is provided between the PC beam forming member 12 and the PC column forming member 10, and the upper and lower beam main reinforcements 22 protruding from the PC beam forming member 12 are provided in the interval L. , 18 are exposed.
A spiral streak 28 is wound around each of the beam main reinforcements 22 and 18 protruding from the PC beam form member 12. When the PC beam form member 12 is disposed, the spiral reinforcement 28 is wound. The streaks 28 are bundled at the base side of each of the protruding beam main streaks 22 and 18.

In arranging the PC beam form member 12, the connecting beam main reinforcement 36 of the block 30 is used.
Are superimposed on the lower and upper beam main reinforcements 18 and 22 projecting from the PC beam member 12, and at the stage where the connection beam main reinforcement 36 and the beam main reinforcements 18 and 22 are superimposed as described above, the spiral reinforcement 28 is formed.
Is stretched to cover this polymerized portion substantially uniformly. Then, a steel plate form 38 is disposed between the PC beam form member 12 and the block body 30 as a discard form along the outer shape of the PC beam form member 12 outside the overlapped portion. .

As described above, the PC column form member 10, PC
In the state where the beam forming frame member 12, the PC block body 30 and the steel plate frame 38 are installed, a concrete pump (not shown) is connected to an injection port 17 formed at the lower end of the PC column forming frame member 10. Concrete is injected from the inlet 17 into the hollow portion S of the PC column form member 10 by press-fitting. Also,
Concrete is poured into the PC beam form member 12 and the steel plate form 38 from the upper open portion.

Therefore, when the concrete poured into the PC column form member 10 is hardened, the lower part 34a of the column main reinforcing bar and the reinforcing bar 14 which are overlapped with each other form a lap joint. The column main reinforcement 26 erected from the floor slab 24 constitutes a lap joint. Therefore, the column main reinforcement 26 and the column main reinforcement lower part 34a can be firmly connected via the lap joints.

On the other hand, when the concrete poured into the steel plate form 38 is hardened, the lower and upper beam main bars 18, 22 and the connecting beam main bar 36, which are overlapped with each other, form a lap joint, and the PC which becomes the beam 40 is formed. The connection between the beam forming frame member 12 and the block body 30 is strengthened, so that the beam 40 can be securely connected to the PC column forming member 10 which becomes the column 50. Thereafter, the formwork of the floor slab 24 is laid, slab arrangement is performed, and slab concrete is cast thereon.
Therefore, the upper part 34b of the column main bar 34 of the block body 30
Is to be erected from the floor slab 24,
By covering the column-shaped frame member 10 made of PC on 4b, the column on the upper floor is built. The construction of the upper floors can be performed sequentially by performing the above steps.

Therefore, in the present embodiment, the precast concrete formwork member 10, in which the columns and beams constituting the reinforced concrete building and the members constituting the column / beam joint portion can be directly applied as a structural material, Since the unit 12 and the unit 30 made of precast concrete are produced in advance in a factory, and these are carried into a construction site so that construction work can be performed, construction can be performed efficiently. In particular, no waste material is generated as in the case of constructing a formwork with plywood, and no formwork is required, so that resources and labor can be saved, and demolding work is omitted. Can also. In addition, since the column form member 10 and the beam form member 12 having a large outer shape are almost semi-precast members and light in weight, a large-capacity lifting machine or the like is required for carrying in or building these members at the construction site. Nor.

Regarding the joining of the reinforcing bars, the main reinforcing bars 34 are buried in the column form member 10 so that the reinforcing bars 14 and the main reinforcing bars 34 form a lap joint structure. Therefore, the stress transmission between the column main reinforcements 26 and 34 can be performed by the lap joint structure, and therefore, the joint between the column main reinforcements 26 and 34 can be simply a butt structure. With such a configuration, it is possible to efficiently complete the construction in a short period of time by reducing the press-joined portions. In addition, it is possible to reduce the number of places where fire is used, so that it is safe and less affected by the weather.

Further, the concrete is poured into the column form member 10 by the injection port 17 formed at the lower end of the column form member 10.
The concrete can be filled evenly into the hollow portion S of the column form member 10 because the concrete is press-fitted from above, and it is possible to prevent the occurrence of jumper and sufficiently secure the strength as a structural material. .

Further, since the formwork to be disposed between the block body 30 and the beam formwork member 12 is a discarded formwork, the removal work can be eliminated and the construction efficiency can be improved.
In particular, since a steel plate is used as the discarded formwork, the short-term stress described above and thus the structural strength can be made sufficiently strong.

By the way, the block 30 is disclosed as a reinforced concrete block using a bar-shaped reinforcing bar as the connecting beam main reinforcing bar 36. However, the present invention is not limited to this, and as shown in FIG. What was formed as a reinforced concrete block can be used. In this way, the building constructed according to the present embodiment has a so-called ramen structure, and short-term stress such as an earthquake is greatly applied to both ends of the beam 40.
Since the steel members 42 are used to connect the two end portions of the block 0 and the block body 30, excellent proof stress against such short-term stress can be exhibited.

[0031]

In summary, the present invention exhibits the following excellent effects. (1) The pillars, beams and the members constituting the column / beam joints constituting the reinforced concrete building are preliminarily factory-manufactured as precast concrete form members and precast concrete units which can be directly applied as structural materials. In this way, the construction work can be carried out by carrying them to the construction site, so that construction can be performed efficiently. In particular, since no waste material is generated as in the case of constructing a formwork with plywood, and no formwork is required,
Resources and labor can be saved, and the demolding operation can be omitted. In addition, since the column form members and beam form members having a large outer shape are almost semi-precast members and are lightweight, there is no need for a large-capacity lifting machine or the like when carrying in or building these members at the construction site. . (2) Regarding the joining of the reinforcing bars, as for the main bars of the column, the reinforcing bars are buried in the column form member, and the reinforcing bars and the main bars of the column form a lap joint structure. The transfer of stress between them can be achieved by this lap joint structure, so that the connection between the main pillars can be a simple butt structure. With such a configuration, it is possible to efficiently complete the construction in a short period of time by reducing the press-joined portions. In addition, it is possible to reduce the number of places where fire is used, so that it is safe and less affected by the weather. (3) In addition, concrete is poured into the column form member from the injection port formed at the lower end portion of the column form member, so that concrete is uniformly injected into the hollow portion of the column form member. It can be filled, and it is possible to prevent the occurrence of jumper and to sufficiently secure the strength as a structural material. (4) Further, the building constructed according to the present invention has a so-called ramen structure. In this case, short-term stress such as an earthquake will be greatly applied to both ends of the beam. Since a steel frame material is used for the connection of, it is possible to exhibit excellent proof stress against such short-term stress. (5) Also, since the formwork to be disposed between the block body and the beam formwork member is a discarded formwork, the removal work can be eliminated to improve the construction efficiency, and in particular, discarded. Since a steel plate is used as the mold, the short-term stress described above, and thus the structural strength, can be made sufficiently strong.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of the process of the present invention.

FIG. 2 is an enlarged sectional view showing a connection state between a column form member and a block body in the present invention.

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

FIG. 4 is an enlarged sectional view taken along line AA in FIG.

FIG. 5 is an enlarged perspective view of a block used in the present invention.

FIG. 6 is a front view of a block body showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Precast concrete column form member 12 Precast concrete beam form member 14 Attached bar 17 Inlet 18 Lower beam main bar 20 Stirrup 22 Upper beam main bar 24 Floor slab 26 Column main bar 30 Block body 34 Column main bar 34a Column main bar lower 34b Column main reinforcement upper part 36 Connecting beam main reinforcement 38 Steel plate formwork 40 Beam 42 Steel frame material 50 Column

Claims (3)

(57) [Claims] 1. A precast concrete column form member having a hollow cylindrical shape, a reinforcing bar and a hoop bar being buried in a thick portion and a concrete inlet formed at a lower end portion, and an upper portion is opened. A precast concrete beam form member having a U-shaped cross section and a beam main bar protruding into a column / beam joint portion embedded in a thick portion, and inserted into a hollow portion of the column form member. U of column main reinforcement and beam form member
Precast concrete column and beam connection block body with connecting beam main reinforcement to be inserted into the U-shaped groove,
Next, the column form member is erected over the existing column main reinforcement, and then the block body is inserted into the hollow portion of the column form member so that the column main reinforcement abuts against the existing column main reinforcement. While placing on the top of the column form member,
On the side of the block, the beam form member is disposed while the beam main reinforcement is superimposed on the connecting beam main reinforcement, and then, a disposal form is disposed between the beam form member and the block body. And then, concrete is press-fitted into the hollow portion from the injection port of the column form member, and concrete is poured into the beam form member and the discard form. Building method using members. 2. The precast concrete column / beam joint block body comprises a steel frame member inserted into a U-shaped groove of the beam form member instead of the connecting beam main reinforcement. A method for constructing a skeleton using the precast concrete formwork member according to claim 1. 3. The method for constructing a skeleton using a precast concrete formwork member according to claim 1, wherein the waste formwork is formed of a steel plate material.