JP3039295B2 - Manufacturing method of prefabricated member of mixed structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a prefabricated member for constructing a mixed structure.

[0002]

2. Description of the Related Art Conventionally, when a mixed structure is constructed, there is a case in which a column member is made of RC and a steel beam is erected above the column member. In such a method, in order to join the steel beam to the upper part of the RC column member, first, the RC column member is constructed by cast-in-place or precast below the beam of the steel beam, and then the end of the steel beam is connected to the RC beam member. It is placed on the upper surface of the RC column member so as to face the column-beam joint at the top of the column member, and is installed between the adjacent RC column members. Then, in this state, concrete for jointing is cast at the beam-column joint to join the RC column member and the steel beam.

According to such a construction method in which a steel beam is placed between RC column members at the time of joining work at a beam-column joint and is supported by these members, a support work for supporting the steel beam is required. Since there is no need to provide a separate installation, the installation work of the shoring work can be omitted, so that there is an advantage that the temporary construction cost can be reduced.

[0004]

However, in the above method, in order to safely support the steel beam on the upper surface of the RC column member, the RC column member must be sufficiently hardened and exhibit strength. However, when the steel beam is simply placed on the upper surface of the RC column member after the RC column member has hardened, the concrete on the upper surface of the RC column member and the lower surface of the steel beam beam abut in a dry relationship. In this state, even when the concrete for jointing is cast at the beam-column joint, the contact surface between the upper surface of the RC column member and the lower surface of the steel beam is hardly filled with concrete, and the RC column member has There was a concern that the upper surface and the lower surface of the steel beam could not be joined.

[0005] Therefore, conventionally, when a steel beam is mounted, a mortar for joining, so-called spread mortar, is previously applied to the contact surface, or a grout material is injected into the contact surface. It is necessary to perform an operation for securing the adhesion strength to the lower surface of the beam, and such an operation is complicated, which has been one of the causes of a prolonged construction period.

Accordingly, the present invention has been made to solve such a problem, and a mixed structure capable of reliably and easily joining a reinforced concrete column member and a steel beam while reducing temporary costs by a simple structure. Of prefabricated members
It is intended to provide a fabrication method .

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above-mentioned object, and a column-to-column joint is manufactured at the time of manufacture.
So that it is positioned below and the pillars project upward
The joints where the steel beams are joined to each other
Place the plate so as to surround it from the outside, and
Plates are joined to each other to form
A joint section formwork is provided on the
Attach the bottom plate to the bottom of
The sleeve joint of the steel bar cage for the column
Under the column reinforced cage so that it is located within the column-beam joint,
Insert the end into the connection form from above, and then
Surround the rebar cage for the column above the connection section formwork.
A concrete casting form is installed and the concrete casting
Put concrete into the inside of the form
Pour the concrete over the rebar cage for the column,
Form concrete columns, and the concrete
It is characterized in that the bottom plate is removed after curing .

[0008]

[0009]

[0010]

The method of manufacturing the prefabricated member of the mixed structure of the present invention
According to the law , when manufacturing the prefabricated member ,
A joint section formwork is provided around the column-beam joint of the positioned steel beam, and a reinforcing steel cage for a column is inserted from above into the joint formwork. By casting concrete over it, a prefabricated member integrally provided with a reinforced concrete column and a steel beam can be easily manufactured.

That is, the beam-column joint is located at the lower position during fabrication.
Laying concrete and placing concrete to form a reinforced concrete column by connecting the steel beam and the reinforced concrete column at the beam-column joint so that the column projects upward. Because you can do it all at once,
The degree of filling of the concrete around the reinforced concrete column / steel beam at the beam-to-column joint can be sufficiently ensured, and the joining strength between the steel beam and the reinforced concrete column can be reliably and easily obtained. When the prefabricated member is built, since the reinforced concrete columns and the steel beams are firmly integrated at the beam-column joint in advance, the support can be omitted, and the beam-column joint after the building is built. In this case, the joining work can be omitted, so that the temporary work cost can be reduced and the on-site work can be saved.

[0012]

Further, if a sleeve joint is provided in the reinforcing steel cage for the column in the connection form so that the joint portion of the other column member to be joined to the main column of the column is located at the column-beam joint portion. However, when the prefabricated member is built, the joints of the column main reinforcement which are likely to be structurally discontinuous are joined to other structural materials such as beams and floor slabs in the column-to-column joints which are structurally strong. Can be located. Thereby, for example, even at a joint where a yield hinge may occur at the joint surface between the reinforced concrete columns due to a shearing force and a bending moment generated at the joint between the reinforced concrete columns, the column main reinforcement is strongly connected. It is possible to join reinforced concrete columns with sufficient joining strength.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIGS. 1A and 1B show a prefabricated member 10 according to the present embodiment. FIG. 1A is a perspective view of the prefabricated member 10 and FIG.

In the figure, a prefabricated member 10 is to be built sequentially at a place where a prefabricated member 100 is to be built in order to construct a mixed building 100 to be described later.
A connection part formwork 12 provided around one column-beam joint,
Reinforcing cage 1 for a column, the end of which is inserted into a connection form 12
3 and a reinforced concrete column 14 formed by casting concrete from the connection form 12 to the reinforcing bar cage 13. In the present embodiment, as shown in FIG. 2B, the lower end of the column main bar 13a of the column reinforcing bar 13 in the joint frame 12 has a column of another column member joined thereto. A sleeve joint 15 is provided so that a joint portion with the main reinforcing bar is located at a beam-column joint portion. On the other hand, an upper end of a column main reinforcing bar 13 a of a reinforcing bar cage 13 is projected on an upper surface of the reinforced concrete column 14. Has been established.

In this embodiment, the steel beam 11 is composed of a steel beam 11a having a length substantially equal to the length of a column span to be built adjacently and a short steel beam 11b perpendicular to the beam span. Have been. And these steel beams 11
Both a and 11b use H-shaped steel, and are joined to each other by, for example, welding, bolting, or the like.

In the present embodiment, the connection part formwork 12 is a box formed by arranging four iron plates 12a having an L-shaped horizontal cross section at four corners. Are arranged in a joint part joined to each other, and a jointing concrete for joining the steel beam 11 and the reinforced concrete column 14 is cast therein.

At the end of each plate 12a, a cut having the same shape as the sectional shape of the steel beam 11 is formed so as to match the steel beam 11 having the H-shaped section. These plates 12a cut the cuts into the steel beams 11a and 11b so as to surround the connection portion of the steel beams 11 from outside.
And the joint 12 is formed by being joined to each other by welding or the like.

The iron plate 12a is left without being removed even after the prefabricated member 10 is completed, and functions as a restraint plate that bears a shearing force or the like acting on the beam-column joint. Further, the connection form 12 may be formed of a plywood or the like, and in this case, the concrete is hardened and then removed.

On the other hand, a bottom plate 12b for closing the bottom for concrete casting may be provided at the bottom of the joint section formwork 12. The bottom plate 12b can be made of, for example, veneer, an iron plate, or the like, and is removed and removed after the concrete for joining has hardened. A temporary fixing means for positioning the sleeve joint may be provided on the concrete casting surface side of the bottom plate 12b.

The reinforced concrete column 14 has a column reinforcing bar 13 composed of a column main bar 13a arranged vertically and a shear reinforcing bar 13b arranged around the column main reinforcing bar 13a so as to connect them. And a concrete portion 14b formed from the mouth form 12 to the periphery of the rebar cage 13 for columns.

The formation of the concrete portion 14b is performed, for example, by placing a concrete casting form around the rebar cage 13 for the column and casting concrete into the inside thereof. As the concrete casting formwork, a concrete form removed after hardening of the concrete or a panel-shaped precast concrete plate forming the outer layer of the reinforced concrete column 14 can be used.

The sleeve joint 15 can be fitted and attached to each lower end of the column main bar 13a in the beam-column joint, and can have the same configuration as that of the related art. Inside and reinforced concrete columns 14
Is provided with an inlet (not shown) arranged to communicate with the outside. When joining the main reinforcing bars 13a of the reinforced concrete columns 14 of the prefabricated members 10, 10, for example, a non-shrink mortar,
A grout material such as an epoxy resin is injected to fix the sleeve joint 15 and the main column bar 13a of another prefabricated member 10 inserted therein.

By arranging the sleeve joint 15 at the beam-column joint as described above, when the prefabricated member 10 is erected, the joint portion of the column main reinforcement which is likely to be structurally discontinuous is replaced with the steel beam 11a, 11b and other structural materials such as floor slabs and the like can be located in a column-column joint that is structurally strong, so that the upper and lower column main bars 13a can be strongly connected, and with sufficient joint strength. Reinforced concrete pillar 1
4 can be joined together.

Then, in order to manufacture the prefabricated member 10 having such a configuration, first, as shown in FIG. That is, as described above, the plates 12a are arranged so as to surround the joint portion where the steel beams 11 are joined to each other from the outside so as to be orthogonal to each other, and are joined to each other by welding or the like. At the same time, the bottom plate 12b is attached to the bottom of the joint section formwork 12.

Next, the lower end of the reinforcing bar cage 13 is inserted into the inside of the joint form 12 from above. At this time, in the present embodiment, a sleeve joint 15 is attached to the lower end of the column main reinforcing bar 13a constituting the column reinforcing bar cage 13 so that it is located in the column-beam joint. Thereafter, a concrete casting formwork is installed above the joint formwork 12 so as to surround the reinforcing bar cage 13 for the column, and concrete is poured into the inside of the formwork, and the concrete form is poured from the joint formwork 12 into the form. Concrete is cast over the reinforced cage 13 to form reinforced concrete columns 14.

After the concrete has hardened, the concrete casting form and the bottom plate 12b are removed while leaving the plate 12a, and the production of the prefabricated member 10 is completed. According to this manufacturing procedure, the concrete for jointing at the beam-to-column joint is laid and the reinforced concrete column 1
Since the concrete casting for forming 4 is performed in a lump, the steel beam 11 and the reinforced concrete column 14 can be integrated, and the joining between them can be reliably and easily obtained.

In order to construct the mixed structure 100 using the prefabricated member 10 manufactured as described above, as shown in FIG. 3, for example, using a lifting crane or the like, the prefabricated member 10 is used.
And build it upside down. In other words, the beam-column joints located at the bottom during the fabrication project upwards (column caps), and the main column bars 13a projecting upward at the time of fabrication project downwards (column bases). Stand up. At this time, the other prefabricated members 1
02 sleeve joint (not shown)
A column main bar 13 projecting from the column base of the prefabricated member 10;
Insert a.

Next, the column base 10a of the prefabricated member 10
And mortar is applied to the joint surface between the lower surface of the prefabricated member 102 and the capital part 102b of the other prefabricated member 102,
A grout material is injected into the sleeve joint of the prefabricated member 102 from an injection port (not shown). On the other hand, another prefabricated member 1 adjacent to the steel beam 11a of the prefabricated member 10
No. 01 steel beam by welding or bolting.

As described above, according to the prefabricated member and the method of constructing a mixed structure using the same, the reinforced concrete column and the steel beam are firmly integrated in advance, so that the installation work of the support structure can be omitted, and The joint work between the pillar and the beam after the installation can be omitted, and the on-site work can be saved while reducing the temporary construction cost. In addition, at the beam-to-column joint, since the concrete filling property around the reinforced concrete column and the steel beam is good, the joint strength between the reinforced concrete column and the steel beam can be ensured.

Further, there is an advantage that the work for building the prefabricated member 10 can be performed in advance of another work, for example, a work for constructing a floor slab. In addition, the construction work of the floor slab can be performed by various construction methods.
It is possible to adopt a method in which a deck plate 16 is arranged between the steel beams 11 of the other prefabricated members 10 already built and concrete is poured there. In this case, for example, ordinary concrete is used for the construction of the reinforced concrete column, and lightweight concrete is used for the floor slab.There is an advantage that the type of the concrete to be cast on the column and the concrete for the floor slab can be changed. is there.

In this embodiment, the prefabricated member is composed of one reinforced concrete column 14, a steel beam 11a having a length substantially equal to the column span, and a steel beam 11b perpendicular to the column span. However, the present invention is not limited to this. For example, as shown in FIG.
One steel beam 11a having twice the length, two steel beams 11b, 11b joined orthogonally thereto, and two reinforced concrete columns 14, 1 joined to the respective beam-to-column joints
4 may be adopted.

[0033]

[0034]

As described above in detail, according to the method for manufacturing a prefabricated member of the present invention, at the time of manufacturing the prefabricated member, the prefabricated member is formed around the column-beam joint of the steel beam located below. A reinforced concrete column and a steel frame are provided by providing a mouth form, inserting a reinforcing steel cage for a column from above into the connecting form, and placing concrete from the connecting form to the reinforcing steel cage for a column. A prefabricated member integrally provided with a beam can be easily manufactured.

That is, at the time of fabrication, the beam-to-column joint is positioned downward.
And the column projecting from the top,
Connection between steel beams and reinforced concrete columns in Japan
Casting concrete and forming reinforced concrete columns
And concrete casting for
Around reinforced concrete columns and steel beams at beam-column joints
A good degree of concrete filling can be ensured.
Ensure that the joint strength with concrete columns can be obtained reliably and easily.
Can be. Therefore, at the time of construction, since the reinforced concrete column and the steel beam are firmly integrated at the beam-column joint in advance, the work of installing the shoring with a simple configuration can be omitted, and the building can be omitted. It is possible to omit the joining work at the beam-to-column joint after the joining, and as a result, it is possible to reliably join the reinforced concrete column and the steel beam while reducing the temporary construction cost with a simple configuration.

[0036]

Further, if the sleeve joint is provided on the reinforcing steel cage for the column in the connection portion formwork, the joint portion of the other column member to be joined with the column main bar is located at the column-beam joint portion. However, when the prefabricated member is built, the joints of the column main reinforcement which are likely to be structurally discontinuous are joined to other structural materials such as beams and floor slabs in the column-to-column joints which are structurally strong. Can be located. Thereby, for example, even at a joint where a yield hinge may occur at the joint surface between the reinforced concrete columns due to a shearing force and a bending moment generated at the joint between the reinforced concrete columns, the column main reinforcement is strongly connected. It is possible to join reinforced concrete columns with sufficient joining strength.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views showing one embodiment of a prefabricated member of the present invention, wherein FIG. 1A is a perspective view thereof, and FIG.

FIG. 2 is a perspective view showing a procedure for manufacturing a prefabricated member according to one embodiment of the present invention.

FIG. 3 is an explanatory view showing an operation procedure for constructing a mixed structure using the prefabricated member of the present invention.

FIG. 4 is a perspective view showing a modified example of the prefabricated member of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 prefabricated member 11 steel beam 12 connection formwork 13 reinforced cage for column 14 reinforced concrete column 15 sleeve joint 100 mixed structure

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI E04B 1/30 E04B 1/30 K (56) References JP-A-2-252830 (JP, A) JP-A-59-233049 (JP, A) JP-A-62-178634 (JP, A) JP-A-62-264230 (JP, A) JP-A-63-151750 (JP, A) JP-A-2-136444 (JP, A) JP-A-4- 80444 (JP, A) Fully open 55-80403 (JP, U) Fully open 1-142701 (JP, U) Fully open, 5-78706 (JP, U) Fully open, 62-73002 (JP, U) Patent 2757043 (JP, B2) Patent 2716521 (JP, B2) JP 5-39378 (JP, B2) JP 7-49681 (JP, B2) JP 51-1334 (JP, B2) 51-39928 (JP, B2) JP 4-24001 (JP, Y2) JP 7-15922 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/18 -1/30

Claims (1)

(57) [Claims] 1. A beam-column joint is located at a lower position during manufacture,
First, the steel beams are connected to each other so as to be orthogonal to each other so that the columns project upward.
Place the plate so that it surrounds the
These plates are joined to each other to
A column having a joint section around it , a bottom plate attached to the bottom of the joint section, and a sleeve joint attached to the lower end of the main bar of the column.
The sleeve joint of the reinforcing steel cage is located in the beam-column joint.
So that the lower end of the reinforcing bar cage is
From above, and then surround the rebar cage for columns above the connection form.
To install concrete formwork
Then, concrete is poured into the casting formwork to
The concrete is struck from the mouth form to the pillar reinforcing cage.
To form a reinforced concrete column and remove the bottom plate after the concrete has hardened.
Manufacture of a prefabricated member of a mixed structure characterized by removing
Construction method.