JPH0518003A - Joining method of steel pipe concrete column and half-precast reinforced concrete column - Google Patents

Abstract

PURPOSE:To offer an energy saving method applicable to a high-rise building consisting of lower sections of steel pipe concrete column construction and upper sections of half-precast reinforced concrete column construction in the high-rise building having 8 to 15 floors. CONSTITUTION:Lower sections of a structure are constructed of a steel pipe concrete column, and then, a plurality of connection reinforcing bars 3 inserting parts necessary for longitudinal anchorage of them into the steel pipe column and projecting remaining parts having proper lengths to the outside thereof are arranged to the inside of the steel pipe in the highest part of the steel pipe concrete column construction. After that, the steel pipe column is filled with concrete 6 to form the steel pipe concrete column 1. Then, the connection reinforcing bars 3...3 projected from the steel pipe concrete column 1 are fitted with a half-precast reinforced concrete column 2, and the steel pipe concrete column 1 is combined with the half-precast reinforced concrete column 2 by placing concrete to the inside of the half-precast reinforced concrete column 2. After that, upper sections are constructed of the half-precast reinforced concrete column, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for constructing a high-rise building on the 8th to 15th floors, in which a lower low-rise part has a steel pipe concrete column structure and an upper high-rise part has a half precast reinforced concrete column structure. The present invention relates to a method for joining a concrete column and a half precast reinforced concrete column.

[0002]

2. Description of the Related Art In recent years, in construction sites, a large amount of temporary materials such as formwork and supporting work, concentrated deployment of labor workers, formwork assembly, safety at the time of dismantling, a large amount of bodywork under lack of skilled workers There are various problems in workability to be solved, such as ensuring a certain quality for parts, and it is an urgent task to develop a construction method that can maintain a certain quality while maintaining safety and labor saving.

As a means for solving these various problems, a half-precast reinforced concrete column which also serves as a formwork is manufactured in a factory, and the main column bar is fitted at the construction site and concrete is placed therein. There is a composite construction method for constructing reinforced concrete columns for buildings.

A half precast reinforced concrete column is a reinforced concrete column formed by filling thin-walled hollow precast concrete with reinforcement and concrete on site.

As another means, a steel pipe column is erected at a construction site, and concrete is then placed in the steel pipe column to use the steel pipe column itself as a formwork for concrete placing. By constructing a structure with high yield strength by synthesizing concrete and steel pipes, or by pre-filling the steel pipe columns with concrete at the factory to make concrete concrete pipes and then assembling this at the construction site. There is a steel pipe concrete pillar construction method for constructing structures.

[0006]

[SUMMARY] However, the construction method of the pillars reinforced concrete using a half precast reinforced concrete pillar, mold but is said to be a method that is labor saving because it is unnecessary, 200kgf / cm ² ~ commonly used
Since a large load cannot be applied only by using concrete of about 300 kgf / cm ^2, it is at most 7
This method is suitable for medium-rise buildings with one to eight floors and is not suitable for higher-rise buildings that exceed this level.

[0007] Further, the construction method using steel pipe concrete columns does not require a formwork like the construction method using half precast reinforced concrete columns, and the steel pipe columns and the concrete inside thereof are sufficiently restrained by the steel pipe. The steel pipe is filled with concrete and buckles are less likely to occur, so the steel pipes bear forces so as to complement each other, improving the yield strength and deformation capacity. It can be said that this is a labor-saving construction method suitable for the structure. However, when pouring concrete into the steel pipe pillar that is to be the pillar, if the concrete is poured from the upper end, the concrete may fall greatly and the concrete may be separated in the middle, or the air in the lower part There was a case where there was no escape and a void was created inside. Therefore, a method of pouring concrete using a tremie pipe or press-fitting concrete from the lower part is performed.

Further, in the type using the inner diaphragm at the beam-column joint portion of the steel pipe column, in these methods, the moisture of the concrete may accumulate on the lower side of the diaphragm due to breathing, so that a void may be generated beforehand. Japanese Patent Application No. 3-49124 and Japanese Patent Application No. 3-49125 propose a method of filling a steel pipe with concrete to form a precast reinforced concrete column and a method of constructing a structure using such a steel pipe concrete column. ). The construction cost of this steel pipe concrete column is higher than that of the half precast reinforced concrete column. Therefore, in a high-rise building, it is very economical to use steel pipe concrete columns in the lower low-rise portion and half precast reinforced concrete columns in the upper high-rise portion.

The present invention is intended to address the above-mentioned problems, and has achieved the object by completing the invention described below.

[0010]

DISCLOSURE OF THE INVENTION The present invention is made by the same inventor in Japanese Patent Application No. 3-49124, “Method for manufacturing steel pipe concrete column” and Japanese Patent Application No. 3-49125, “Construction of steel pipe concrete structure”. It was invented as a result of further consideration based on the “method”.

According to the present invention, the lower low-rise portion is constructed by using a steel pipe concrete column, and the upper high-rise portion is constructed by using a half precast reinforced concrete column, and the steel pipe concrete column structure is used as a joining means of the columns at that time. In the steel pipe column at the top of the object, the connecting rebars are inserted so that the part necessary for fixing in the length direction is inserted into the steel pipe column and the remaining part with an appropriate length projects outside the steel pipe column. After arranging a plurality of steel pipe columns, concrete is filled with the steel pipe columns to form steel pipe concrete columns, and then half-precast reinforced concrete columns are fitted to the connecting rebars protruding from the steel pipe concrete columns so that the connecting rebars are inside, By filling the interior of precast reinforced concrete columns with concrete, steel pipe concrete columns and half precast reinforced concrete columns A method of joining steel concrete column and Precast reinforced concrete column, characterized in that an integral both to join the over preparative column.

Further, after fitting the half-precast reinforced concrete column to the connecting rebar projecting from the steel-tube concrete column, and before filling the concrete, the joint between the steel-tube concrete column and the half-precast reinforced concrete column has a high fluidity. It is also characterized by grouting high-strength non-shrink mortar.

In this case, the steel pipe column means a hollow steel pipe in which nothing is filled in the steel pipe, an opening of the steel pipe,
That is, the steel pipe (intermediate between steel pipe and steel pipe concrete column) pre-filled with concrete shall be included only in the intermediate part except the vicinity of the joint with the half precast reinforced concrete column. In addition to those manufactured by filling concrete with
It shall include both precast members manufactured in advance in the factory.

[0014]

[Operation] By providing a connecting rebar on the steel pipe column so as to project from the steel pipe opening end to form a steel pipe concrete column,
It becomes possible to join with half precast reinforced concrete columns, and by sliding so that the inner surface of the half precast reinforced concrete columns is guided in contact with the connecting rebars and fitting the connecting rebars, it is easy and without displacement. The connection can be fixed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

According to the present invention, first, a lower lower layer portion of a structure is constructed by using a steel pipe concrete column. As the means, for example, Japanese Patent Application No. 3-4912 invented by the present inventor
The means described in No. 5, that is, the steel pipe is preliminarily filled with concrete in a factory or the like to form a steel pipe concrete pillar, and then the steel pipe concrete pillar is carried into a construction site and erected in the same manner as a normal steel frame. At that time, a graft injector is inserted between the steel tube concrete column and the steel tube concrete column, and the two steel tube concrete columns are joined together by grouting a grout material from the inlet of the graft injector. Build the lower part.

At this time, a steel pipe concrete column having connecting rebars, which is a steel pipe concrete column to be joined to the half precast reinforced concrete column, is manufactured in a factory or the like, and is placed at the top of the steel pipe concrete column structure. Keep it. This steel pipe concrete column has a connecting rebar (3) in which a portion necessary for fixing in the longitudinal direction is inserted into the steel pipe column and the remaining portion having an appropriate length is projected outside the steel pipe column. ) Are arranged, and then concrete is filled into the steel pipe pillar to form a steel pipe concrete pillar. Then, if necessary, another connecting reinforcing bar (3b) is added to the connecting reinforcing bar (3 ... 3) protruding from the steel pipe concrete column by a method such as a welding joint or a lap joint to make a sufficient length. The location and number of the connecting reinforcing bars (3) are arbitrary, and it is sufficient that the half precast reinforced concrete columns and the steel pipe concrete columns can be reliably joined and the strength can be maintained.

Thereafter, a half precast reinforced concrete column (2) is fitted from above the connecting rebars (3 ... 3) so that the connecting rebars (3 ... 3) are on the inside, and the half precast fitted. By filling the inside of the reinforced concrete column (2) with concrete, the steel pipe concrete column (1) and the half precast reinforced concrete column (2) are joined to integrate them.

The steel tube concrete column may be manufactured by a method of filling at the construction site in addition to the one prepared and placed in the factory in advance as described above. Further, the shape of the pillar may be a cylinder regardless of the prismatic shape shown in the drawing.

Further, after connecting the half-precast reinforced concrete columns (2) to the connecting rebars (3 ... 3) protruding from the steel tubular concrete columns (1), the steel pipe concrete columns (1) and It is advisable to provide a mold at the joint portion of the half precast reinforced concrete column (2) and grout a high-strength non-shrink mortar (7) having high fluidity in order to fill the gap between the joint portions.

In the drawing, the half precast reinforced concrete columns (2) are connected to the reinforcing bars (3 ... 3).
It has the same size as the inner dimension of the steel pipe concrete column (1), but if it is not thicker than the steel pipe concrete column (1), it may be larger than that shown in the drawing, Further, if the connecting reinforcing bars (3 ... 3) can be fitted, the size may be smaller than that shown in the drawings.

After that, the upper high-rise portion is constructed using the half precast reinforced concrete columns. As a construction method, the half precast reinforced concrete columns (2) for columns are connected and fixed using the connecting rebars (3 ... 3). Then, the concrete member for the beam is fixed at an appropriate position by using a formwork and a stopper, and then the inside of the half precast reinforced concrete column (2) for the column and the concrete member for the beam is filled with concrete to be integrated. . This is repeated repeatedly. At this time, shear reinforcements such as hoop reinforcements may be previously arranged at appropriate intervals on the concrete member for the beam, and then concrete may be filled.

[0023]

[Effect] As described above, the lower low-rise part is a structure made of steel pipe concrete columns with extremely high proof strength and deformation capacity, and the upper high-rise part is a structure made of half-precast reinforced concrete columns, which is cheaper than steel pipe concrete columns. By doing so, it is possible to make an economical structure as a whole by using each member in the right material in the right place, and at the same time, it is a construction method in which skilled workers such as formwork and reinforcing bar work are extremely labor-saving. I can say.

Further, since the entire structure is constructed in the prefabricated form, the structure can be constructed as planned in a relatively short period of time, and it can be said that this is also an excellent construction method.

[Brief description of drawings]

FIG. 1 is a perspective view showing a means for joining a steel pipe concrete column and a hollow concrete member according to the present invention.

FIG. 2 is a side view showing a means for joining a steel pipe concrete column and a hollow concrete member according to the present invention.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a sectional view taken along the line YY of FIG.

FIG. 5 is a sectional view taken along line ZZ of FIG.

[Explanation of symbols]

1 ... Steel tube concrete pillar 2 ... Half precast reinforced concrete columns 3,3b ... Connecting rebar 4 ... Beam main frame 5 ... Reinforcing bar connection 6,6b ... Concrete 7: High strength non-shrink mortar 8: Floor material (concrete) 9 ... Reinforcing steel bars

Claims (2)

[Claims] 1. A connection reinforcing bar is arranged in a steel pipe column so that a portion necessary for fixing in the lengthwise direction is inserted into the steel pipe column and a remaining portion having an appropriate length projects outside the steel pipe column. Then
After that, the concrete is filled with concrete in the steel pipe column to form a steel pipe concrete column, and then a half precast reinforced concrete column is fitted to the connecting rebar protruding from the steel pipe concrete column, by filling the inside of the half precast reinforced concrete column with concrete. A method for joining steel pipe concrete columns and half precast reinforced concrete columns, characterized by integrating both. 2. A high-strength non-shrink mortar having high fluidity is ground at the joint between the steel pipe concrete column and the half precast reinforced concrete column after fitting the half precast reinforced concrete column to the connecting rebar protruding from the steel pipe concrete column. Claim 1 characterized by the above.
Method for joining steel pipe concrete columns and half precast reinforced concrete columns as described in.