JP2548614B2 - Reinforcement structure of member using high strength steel frame - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reinforcing structure for members using high-strength steel frames, and in particular, a structure such as a pillar or a beam is a steel-framed reinforced concrete structure using high-strength steel frames. The present invention relates to a reinforcing structure for a member when being formed.

[Prior Art] Large structures such as buildings and civil engineering structures are usually formed of steel reinforced concrete. Explaining by the horizontal cross-sectional view of FIG. 2, in the figure, 1 is a steel-framed reinforced concrete column, and an example of a side column is shown in which the width a is taken in the girder direction and the component b is the beam-to-beam direction. Therefore, the main material is the steel frame 2 having a T-shaped cross section. 3 is a reinforcing bar of the main bar, 4 is a hoop bar, 5 is a concrete part, 6 is a flange 21 located outside the steel frame 2 and the hoop bar 4, and is a concrete restraint part surrounded by these steel materials. is there.

On the other hand, in the cross-section design of steel-framed reinforced concrete members, since a composite structural material of steel frame, rebar and concrete is formed, steel is placed on the outer periphery so that the effective section modulus can be obtained, and the concrete is compressed. It is designed to double as a fireproof coating and reinforcement at the time. Therefore, in order to secure the effective space of the building, it is advantageous to increase the strength of each material, adopt high-strength steel frame as the steel frame, and use concrete with high compressive strength. Therefore, steel having a tensile strength of 60 kg / cm ² or more has come to be used.

[Problems to be Solved by the Invention] In the structure as shown in FIG. 2, between the flange 21 located outside the steel frame 2 and the hoop reinforcement 4, the restraint of concrete surrounded by these steel materials. Since the portion 6 itself is generally unreinforced, the restraining force for the steel frame 2 is relatively weak under the large stress of the column 1. Therefore, peeling easily occurs from the flange 21, which is a weak point. Therefore, it is necessary to consider the reduction factor of the design strength in this portion. In terms of fire resistance, this part is
With the general fireproof coating, due to the rapid expansion during a fire,
There is a high risk of causing explosion of concrete, and in general, as the strength of concrete increases, the momentum of explosion increases, so the function of the fireproof coating tends to be lost, and the advantage of members using high strength steel frame is Will be killed.

[Means for Solving the Problems] The present invention was devised with the problems described above eliminated and rationalization thereof, and in the structure of a steel reinforced concrete member using high-strength steel, To provide a reinforcing structure for a member using a high-strength steel frame, characterized in that a lattice body formed of a steel material is fixed in a range surrounded by an outer side edge of a steel frame and a reinforcing rebar of an outer periphery. It is intended.

According to the present invention, even in a member using a high-strength steel frame, the constrained portion of concrete outside the steel frame is reinforced, and the strength of integrally functioning as a whole member is enhanced, and the structural design is advantageously rationalized. The purpose to be achieved is achieved.

[Example] A reinforcing structure for a member using the high-strength steel frame of the present invention will be described in detail with reference to the drawings showing an example. Figure 1
FIG. 2 is a horizontal cross-sectional view showing a case where the present invention is applied to a steel-framed reinforced concrete column, and reference numerals in FIG. 2 are common to corresponding parts.

In the figure, 1 is a pillar, 2 is a T-shaped steel frame, 3
Is a reinforcing bar of a main bar mainly arranged in the corner of the column 1, 4 is a hoop bar, 5 is a concrete part of the column 1, and 6 is a concrete restraining part.

In the present invention, the reinforcing body 10 is arranged so as to surround the range of the concrete constrained portion 6 located outside the steel frame 2 of the pillar 1. This reinforcing body 10 is a steel wire or a thin reinforcing bar 11,
It is assembled into a grid of about 10 cm by welding,
The U-shaped cross section is bent toward the inside of the column 1 so as to surround the outside of the flange 21 of the steel frame 2. The length in the direction along the pillar 1 is a length continuous with a part of the length or the entire length. Then, the reinforcing body 10 is appropriately fixed by using the flange 21 and the hoop 4.

In addition, it goes without saying that the reinforcing structure of the present invention is not limited to the above-described embodiment, and for example, the pillar as the target member is not limited to the side pillar, but is adopted as the middle pillar to make the steel frame a cross shape. It may be one, and naturally, it may be adopted for the beam. In addition, a weld mesh, a hexagonal net, or the like can be used for the reinforcing body 10, and the size of the mesh can be changed.

[Operation] The operation of the reinforcing structure for a member using the high-strength steel frame of the present invention will be described based on its construction method.

In the pillar 1, the steel frame 2 is erected in advance, and the reinforcing bars 3 and the hoop bars 4 are assembled in parallel by a conventional method. At this time, the flange 10 of the steel frame 2 and the hoop muscle 4 are engaged with the reinforcing body 10 assembled and formed in advance, and
It is attached so as to surround the outer circumference of 21 and fixed to these steel materials. Then, by the normal construction method, the concrete formwork 7
And the concrete 5 of the member is placed.

The function of the reinforcing structure of the present invention configured as described above is that the reinforcing body 10 is connected to the steel frame 2 and the hoop 4 to form a sufficient reinforcing steel material with respect to the restraint portion 6 of concrete, and the restraint portion 6 is entirely Since the concrete is bound around the circumference, even if high-strength steel frame is used as the main steel material of the member, the member will have the strength as a composite material corresponding to the strength. Moreover, there is no fear of explosion, the member functions as a fireproof structure, and safety is secured.

This means that not only can advantageous high-strength steel frames be adopted in steel-framed reinforced concrete members, but it is also possible to jointly use ultra-high-strength concrete, and, as a fire-resistant structure, a significant improvement can be achieved. Be brought.

EFFECTS OF THE INVENTION The present invention relates to a structure of a steel-framed reinforced concrete member using a high-strength steel frame, and a grid body formed of a steel material in a range surrounded by outer side edges of the steel frame of the member and reinforcing reinforcing bars on the outer circumference. Since, when the high-strength steel frame is used for the member made of steel-reinforced concrete, the restraint part that is the weak point of the member is strengthened, so the member of steel-reinforced concrete as a composite material of steel and concrete However, corresponding to the adoption of high-strength steel frame, the structural strength is balanced and the strength is improved, and it is not necessary to consider the reduction coefficient as in the prior art. Moreover, prevent the fear of explosion,
The function of the fireproof structure of the member is perfect and the safety is secured.

Further, since the reinforcing body which is particularly mounted and used in the present invention is formed by using an ordinary steel material and is easily arranged in parallel with the assembly of the steel frame, the reinforcing bar, etc., another type of process is required. Not only that, the compatibility and selection range are wide with respect to the configurations of various structures, and the target member is not limited.

Therefore, the present invention can be applied to various steel-framed reinforced concrete members to solve the problem of strength, and makes a great contribution to the construction industry.

[Brief description of drawings]

The drawings explain the reinforcing structure of a member using the high-strength steel frame of the present invention based on examples, and FIG. 1 is a horizontal cross-sectional view showing an example in which the present invention is applied to a steel-reinforced concrete column, FIG. 2 is a horizontal sectional view of a column for explaining the conventional technique. 1 ... Pillar, 2 ... Steel frame, 3 ... Reinforcing bar, 4 ... Hoop, 5
…… Concrete, 6 …… Restraint, 7 …… Form, 10…
… Reinforcement, 11 …… Steel wire, 21 …… Flange.

Claims (2)

(57) [Claims] 1. In a structure of a steel-framed reinforced concrete member using high-strength steel frame, a lattice body made of steel is fixed in a range surrounded by outer side edges of the steel frame of the member and reinforcing reinforcing bars on the outer periphery. A member reinforcement structure using high-strength steel frames. 2. The reinforcing structure for a member using a high-strength steel frame according to claim 1, wherein the lattice body is formed by welding a steel wire and is fixed to a part or the entire length of the member.