JPH0321755A - Concrete structural member - Google Patents

Abstract

PURPOSE:To secure high strength and high stiffness as well by arranging spiral reinforcing members in which main reinforcing bars are interposed, with concrete or mortar filled in, in a column form around the outer circumference, thereby placing concrete in the insides and the outer circumferences of the members. CONSTITUTION:Main reinforcing bars 2... such as high strength reinforcing bars or PC steel members are inserted into spiral reinforcing bars 4... and concrete or mortar 3 is filled therein. Then, the spiral reinforcing bars 4... are arranged in a column form around the outer circumference within the compression range in a concrete structural member 1. Successively, concrete 6 is placed into a hollow section 5 enclosed by the spiral reinforcing bars 4... and in the circumferential sections of the respective spiral reenforcing bars 4.... In addition, structural members wherein the spiral reinforcing bars 4... are arranged in a column form around the outer circumference within the compression range of a concrete structural member, are prepared as required in number so that works at a work site can be minimized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a reinforced concrete I structure and a concrete I structure used as columns and beams that require high strength and high toughness in a steel reinforced concrete structure. It is related to members.

[Prior art]

Conventionally, this type of high-strength, high-toughness concrete structural members have been constructed by assembling pre-assembled reinforcing bars using high-strength reinforcing bars as the main reinforcement and spiral hoops as shear reinforcing bars, and then attaching them around the pre-assembled reinforcing bars. It is generally known that ultra-high strength concrete is poured into the frame on-site.

[Problems to be solved by this invention] However, with this conventional concrete structural member, due to the characteristics of the material (ultra-high strength concrete) (poor fluidity, etc.), it is difficult to perform reinforcement work that takes these into consideration. difficult to
Additionally, problems remain in terms of reliability of concrete quality.

On the other hand, recently I have been working on reinforcing bars. The shortage of skilled workers such as formwork carpenters has become a serious problem, and as mentioned above, if construction is extremely difficult, the construction time will be long.

Therefore, it is required to minimize reinforcing steel work and formwork work on site.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to provide a concrete structural member that is easy to construct and can be made into stronger columns and beams.

[Means for Solving the Problems] The concrete structural member according to the present invention has a main reinforcement made of high-strength reinforcing steel or PC rope penetrating inside, and the inside through which the main reinforcement penetrates is filled with concrete or mortar. Spiral reinforcements are arranged in a row on the outer periphery of the compression zone of a concrete structural member, and concrete is poured into the hollow area surrounded by the spiral reinforcements arranged in the row and the outer periphery of each spiral reinforcement. shall be.

By arranging the spiral reinforcement inside the main reinforcement and filling it with concrete or mortar in a row around the outer periphery of the compression zone of the concrete structural member, it is possible to ensure high strength and high toughness. Make it.

In addition, since the spiral reinforcements are arranged in rows on the outer periphery of the compression zone of concrete structural members, it is possible to prepare them in advance. There is a method that allows the frame work to be minimized.

[Example] The concrete structural member of the present invention will be described below with reference to an example illustrating the concrete structural member. Although the concrete structural member of the present invention can be applied to both columns and beams as structural members, a column will be explained here as an example.

The concrete structural member 1 of the present invention (see Fig. 1) has a main reinforcing bar 2 made of high-strength reinforcing steel or a PC net material penetrating inside, and the inside penetrated by the main reinforcing bar 2 is filled with concrete or mortar 3. A plurality of spiral reinforcements 4 are arranged in a row on the outer periphery of the compression zone of the concrete structural member, and concrete 6 is placed in a hollow part 5 surrounded by each spiral reinforcement 4 arranged in the row and in the outer periphery of each spiral reinforcement 4. has been installed.

The main reinforcing bars 2, concrete or mortar 3, and spiral reinforcing bars 4 in this embodiment may be precast concrete hollow members A prepared in advance as shown in FIG. In addition, the code 7 indicates each spiral muscle 4.
The hoop muscle 8 is an intermediate band muscle for restraining the .

Each of the arranged spiral reinforcements 4 gives a confining effect to the concrete or mortar 3 inside, and in order to prevent the concrete or mortar 3 from being distorted in the lateral direction, the concrete or mortar 3 inside the spiral reinforcement 4 is Significantly increased strength.

By constructing a member having a cross section as shown in Fig. I using this precast concrete hollow member 8 as a core, it becomes possible to construct a column 9 with high strength and high toughness. Therefore, the cross-sectional dimension of the pillar 9 can be reduced, and the weight can also be reduced to the same level as that of a conventional pillar.

As a result, if applied to a high-rise building, for example, a living space with inconspicuous pillars can be secured even on the lower floors, increasing the degree of freedom in design. Furthermore, since the column's own weight is reduced, an economical structural design becomes possible.

Note that this precast concrete hollow member A can be produced on-site or in advance at a factory. Further, by providing an unbonding treatment layer made of grease, asphalt, etc. on the inner surface of the spiral streaks 4, adhesion to concrete or mortar 3 can be eliminated. Furthermore, it is necessary to use the spiral muscle 4 having an extremely dense pitch.

3 to 5 show other embodiments of the spiral muscle.

Here, a rectangular spiral muscle IO is used.

In the case of such a square spiral muscle lO, the fourth
As shown in the figure and FIG. 5, they can be arranged one on top of the other, and the main reinforcing bars 2 can be passed through that part.

The construction of the concrete structural member 1 having such construction is carried out as follows.

As shown in FIG. 6, a precast concrete member A, in which spiral reinforcements 4 with main reinforcements 2 passing through and filled with concrete or mortar 3 are arranged around the outer periphery and tied together with hoop reinforcements 7, is assembled into this precast concrete member 1. Set it to match the main reinforcement 2 of the lower precast 1 and concrete member B, which has the same structure as A.

And in precast concrete member A, beam main reinforcement 1
1 is installed in advance, and the connecting spiral reinforcement 12 is attached in advance.
Temporarily secure it at the bottom end. The connecting spiral muscle 12 is a spiral muscle having a larger diameter than the spiral muscle 4.

Next, as shown in FIG. 7, the main reinforcements 2 of the precast concrete member A and the main reinforcements 2 of the lower precast concrete member B are welded. Subsequently, the connecting spiral reinforcement 12 is moved to the welding position and fixed, and then grouting is performed inside.

After the connection of precast concrete members A and B is completed as described above, a formwork (not shown) is set around it,
Concrete 6 is placed in the hollow portion surrounded by each spiral reinforcement 4 and in the outer periphery of each spiral reinforcement 4.・It is not necessary to make concrete 6 particularly high in strength.

In this way, a column having a high strength and high toughness structure can be constructed.

(Effects of the Invention) The concrete structural member of the present invention has a main reinforcing bar made of high-strength reinforcing steel or a PC mesh material penetrating the inside, and a spiral reinforcing bar in which the inside penetrated by the main reinforcing bar is filled with concrete or mortar. A plurality of concrete structural members are arranged in a row on the outer periphery of the compression zone, and concrete 1 is poured into the hollow part surrounded by each spiral reinforcement arranged in the row and in the outer periphery of each spiral reinforcement. It is characterized by what it did.

According to this configuration, spiral reinforcements with main reinforcements inside and filled with concrete or mortar are arranged in rows around the outer periphery within the compression zone of the concrete structural members, thereby increasing the height of the concrete 1 and structural members. To ensure strength and high toughness.

In other words, each arranged spiral reinforcement gives a confining effect to the concrete or mortar inside, and prevents the concrete or mortar from being distorted in the lateral direction, greatly increasing the strength of the concrete or mortar inside the spiral reinforcement. can do.

Therefore, by constructing a structural member around a core in which these spiral reinforcements are arranged in rows around the outer periphery within the compression region, it becomes possible to construct a structural member with high strength and high toughness. Therefore, the cross-sectional dimension of the structural member can be reduced, and the weight of this structural member can also be reduced to about the same level as a conventional structure.

As a result, for example, if this structural member is applied to the columns of a skyscraper, it will be possible to provide a strong column with a small cross-sectional dimension, allowing for a living space where the column is not conspicuous even on the lower floors, giving freedom in design. degree will improve. Furthermore, since the column's own weight is reduced, an economical structural design becomes possible.

On the other hand, in the case where the spiral reinforcements are arranged in rows around the outer periphery within the compression zone of the concrete structural member, they can be prepared in advance, so that reinforcing reinforcement work and molding at the construction site (construction location) of the concrete structural member can be done in advance. Frame construction can be minimized. Therefore, strong concrete structural members can be easily produced in a short time.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the concrete structural member of the present invention, Fig. 2 is a cross-sectional view of the concrete structural member of the present invention in a state where each spiral reinforcement is assembled, and Figs. 3 to 5 6 is a cross-sectional view showing another aspect of the spiral reinforcement forming the concrete structural member of the present invention, and FIGS. 6 and 7 are front views showing examples of connection of members during construction of the concrete structural member of the present invention. be. 1... Concrete structural member, 2... Main reinforcement, 3...
・Concrete or mortar, 4...Spiral reinforcement, 5...Hollow part, 6...Concrete, 7...Hoop reinforcement, 8...Intermediate tie reinforcement, 9...Column, 10... Square spiral reinforcement, 11...beam main reinforcement, l2...spiral reinforcement for connection. Figure 3 Figure 6

Claims (1)

[Claims] A plurality of spiral reinforcements, each of which has a main reinforcement of high-strength reinforcing steel or PC rope penetrated inside, and which is filled with concrete or mortar, are arranged in a row around the outer periphery of the compression zone of a concrete structural member. 1. A concrete structural member, characterized in that concrete is cast in a hollow portion surrounded by each spiral reinforcement arranged in a row and in an outer periphery of each spiral reinforcement.