JPH0723457Y2 - Square steel pipe concrete member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a square steel pipe concrete member such as a square steel pipe concrete column and a square steel pipe concrete compression member.

(Prior Art) Conventionally, as shown in FIGS. 12 and 13, a rectangular steel pipe (a)
Fill the inside with concrete (b), or Fig. 12a and 1
As shown in Fig. 3a, the square steel pipe (a) is provided with main bars (d) and strips, and the square steel pipe concrete member configured by filling concrete is used as columns and other compression members. .

(Problems to be solved by the invention) Although the concrete-filled rectangular steel pipe member is superior in cross-sectional performance as compared with the concrete-filled round steel pipe member, it is a dotted line portion in a portion to which high compressive force is applied. Since buckling occurs as shown in (c), the restraining force against the concrete (b) placed in the square steel pipe (a) is loosened, and as a result, the yield strength is lower than that of the round steel pipe concrete member. Become.

The present invention has been proposed in view of the above problems of the prior art. The object of the present invention is to prevent deformation of a rectangular steel pipe under high compression force and to increase the strength of the member. The point is to provide the member.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the rectangular steel tube concrete member according to the present invention has a main bar and a band bar arranged on the outer side in the hollow portion of the rectangular steel tube, and further less on the inner side thereof. Along the entire length or end of the steel pipe excluding a part of the joint with the beam, spiral reinforcement or ring reinforcement is arranged by connecting with auxiliary reinforcement without using main reinforcement, and the steel pipe is filled with concrete. It is configured.

(Operation) Since the square steel pipe concrete member according to the present invention is configured as described above, the main bar is attached to the entire length of the square steel pipe excluding at least a part of the beam joint, or the end of the steel pipe. Arranged by connecting with auxiliary reinforcement so as to keep the spacing of the spiral reinforcement or ring reinforcement without using it, the concrete swelling of the high compression part was restrained by placing concrete in the square steel pipe, and bending Also, deformation of the rectangular steel pipe due to axial force and the like is prevented.

(Embodiment) The present invention will be described below with reference to the illustrated embodiment.

(1) is a rectangular steel pipe, and main bars (5) and stirrups (6) are arranged in the hollow part of the same steel pipe (1), and the entire length of the rectangular steel pipe or the joint with the beam is removed inside Spiral reinforcements (2) or ring reinforcements are arranged at the ends, and the steel pipe (1) is filled with concrete (3) to form a square steel pipe concrete member (A).

In the figure, (4) is an auxiliary bar extending in the axial direction of the rectangular steel pipe (1) connected by winding the spiral bar (2), (5) is a main bar, (6) is the same bar (5) It is a strip that is wound around. (See FIG. 1 and FIG. 2) Incidentally, instead of the spiral muscle (2), a ring muscle (2 ′)
Alternatively, the ring bar (2 ') may be formed by bending a steel wire or steel bar into a ring shape and overlapping and welding (W) both ends of the steel wire or steel bar (see Fig. 10). It is constructed by butt welding (W '). (Refer to FIG. 11) Since the illustrated embodiment is configured as described above, the spiral muscle (2) or the ring arranged in the rectangular steel pipe (1) and connected by the auxiliary muscle (4) or the ring. Muscle (2 ')
As a result, the binding force for the concrete in the rectangular steel pipe (1) is increased, the deformation of the rectangular steel pipe (1) in the high compression force portion due to bending and axial force is prevented, and the yield strength of the rectangular steel pipe concrete member is increased.

FIG. 3 shows another embodiment of the present invention, in which the main bar (5) and the stirrup (6) are arranged in the hollow portion of the rectangular steel pipe (1), and further the main bar (5) and the stirrup ( Inside of 6), the entire length of the steel pipe except at least a part of the joint with the beam, or the longitudinal spiral end (2 ″) or stirrup is connected by the auxiliary reinforcement without using the main reinforcement. While being installed, concrete (3) is poured into the square steel pipe (1) to form a square steel pipe concrete member.

In the figure, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals.

The embodiment shown in FIGS. 4 and 5 shows the case where the spiral stirrup (2) is arranged at the end of the rectangular steel pipe except at least a part of the joint with the beam, respectively. Shows the case where the rectangular steel pipe concrete member (A) is used as a column member.

FIG. 6 shows a case where the rectangular steel pipe concrete member (A) is applied in a compression bracing manner, and the spiral stirrup (2) is arranged over the entire length of the joint of the square steel pipe and the beam except for a part thereof. Has been done.

(Effect of the Invention) As described above, the concrete member of the square steel pipe according to the present invention has the main bar and the band bar arranged on the outside in the hollow portion of the square steel pipe, and further, at least one of the joints with the beam inside thereof. The spiral or ring reinforcement is arranged at the entire length excluding the section or the end in the length direction, and since the square steel pipe is filled with concrete, it is highly compressed by bending and axial force. The deformation of the rectangular steel pipe of the force portion is prevented, and the proof stress of the member is increased.

Therefore, the rectangular steel pipe concrete member according to the present invention is a member having a smaller cross section and a higher toughness than the conventional rectangular steel pipe concrete member, and the plate thickness of the rectangular steel pipe can be reduced. It can also be applied to super high-rise buildings.

Further, the spiral or ring reinforcement is a supplementary reinforcement without using a main reinforcement so as to maintain a space at the longitudinal direction excluding at least a part of the joint with the beam in the rectangular steel pipe or at the end in the longitudinal direction. Since the main reinforcements for maintaining the spacing between the spiral reinforcements and the ring reinforcements largely project to the beam joints, the main reinforcements of the column and beam are radiatively arranged at the joints, and there is no fear of reducing workability.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rectangular steel pipe concrete member according to the present invention, FIG. 2 is a transverse plan view thereof, and FIG. 3 shows another embodiment of a rectangular steel pipe concrete member according to the present invention. Cross sectional plan views, FIGS. 4 to 6 are vertical sectional views showing still other embodiments of the rectangular steel pipe concrete member according to the present invention, FIG. 7 is a front view of a spiral streak, and FIG. 8 is its plan view. Fig. 9 is a front view of the ring muscle, Fig. 10 and 11
The figures are plan views thereof, respectively, FIGS. 12 and 12a are longitudinal sectional views of a conventional rectangular steel pipe concrete member, and FIGS. 13 and 13a are transverse plan views thereof. (1) ... Square steel pipe, (2) (2 ″) ... Spiral streak,
(2 ') ... Ring reinforcement, (3) ... Concrete, (5) ...
Main bar, (6) ... stirrup

Claims (1)

[Scope of utility model registration request] 1. A main bar and a stirrup are arranged on the outside in a hollow portion of a rectangular steel pipe, and a main bar is provided on the inside thereof at the entire length or at the end except at least a part of a joint with a beam. A rectangular steel pipe concrete member characterized in that spiral steel or ring muscles are connected by auxiliary muscles without being used, and the steel pipe is filled with concrete.