JPH03156048A - Joining construction of steel pipe column and slab in flat slab construction - Google Patents

Abstract

PURPOSE:To promote filling efficiency of concrete by penetrating a steel pipe of a column and slab cross section with a plurality of through-reinforcements to arrange them up and down and, at the same time, connecting reinforcing members to the through-reinforcements, and lapping main reinforcements with rein-forcing members. CONSTITUTION:A plurality of through-reinforcements 5 constituted of upper reinforcements 5b and lower reinforcements 5c are arranged up and down to a steel pipe 2a of a column and slab cross section 1a in a state to penetrate the steel pipe 2a with them. Reinforcing steel plate materials 6 are connected to the through- reinforcements 5 in a state to pass through a dangerous section CS having possibility of shearing and breakdown, and main reinforcements 10 are lapped with the steel plate materials 6. Shearing stress generated around a steel pipe column 2 is supported by reinforcing steel plates 6b of the steel plate materials 6, and the shearing and breakdown of slabs 3 is prevented. In addition, the bending stress in the slabs 3 is supported by the main reinforcements 10, it is transmitted to the steel plate materials 6 through lap sections 10b, and it is transmitted to a part of the steel pipe column 2 through a reinforcing bars 6a and through-reinforcements.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention provides a flat slab structure in which concrete can be easily poured into a steel pipe by minimizing the number of reinforcing bars in the pipe. Regarding the joint structure of steel pipe columns and slabs.

(b), Conventional technology Conventionally, in flat slab structures, there is a risk of shear failure (punching failure) occurring near the joint between the column and the slab. A reinforcing steel frame was installed that penetrated the columns to provide shear reinforcement.

(C) 0 Problems to be Solved by the Invention However, when a steel pipe column is used as a column, it is difficult to install a reinforcing steel frame to penetrate the column, and it has been desired to develop some other method.

Therefore, a method of installing reinforcing members around the steel pipe column via reinforcing bars that penetrate the steel pipe may be considered.
Inside the steel pipe, the main reinforcing bars arranged in the slab are installed through the steel pipe, and if the reinforcing bars that hold the reinforcing members are placed, the reinforcing bars become tangled inside the steel pipe, and when concrete is poured into the steel pipe, it becomes difficult to place concrete. This has the disadvantage that the flowability of the concrete is hindered and the filling properties of the concrete are deteriorated.

In view of the above-mentioned circumstances, an object of the present invention is to provide a joint structure between a steel pipe column and a slab in a flat slab structure that can ensure the flow of concrete within the steel pipe while performing shear reinforcement of the slab. That is.

The main reinforcing member (10) is wrapped with the reinforcing member, and the main reinforcing member (10) is connected to the steel pipe (2a) by passing through the steel pipe (2a).
It is configured so that it can be installed without penetrating the inside.

Note that the numbers in parentheses are for convenience only to indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings.
The same applies to the column ``, action''.

(d) Means for solving the 0 problems, namely 1 The present invention has a slab (3) provided with horizontally arranged main reinforcements (10), and the slab (3) is provided with steel pipes (2a). In a flat slab structure (1) formed by erecting steel pipe columns (2) having a column-slab intersection (1a
) are provided with a plurality of through reinforcements (5) consisting of an upper reinforcement (5b), a lower reinforcement (5c), etc. arranged vertically so as to penetrate the steel pipe (2a), and these through reinforcements ( 5) The critical cross section (CS) of shear failure of the reinforcing members (6, 9) (e) 0
Effect With the above-described configuration, the present invention can reduce the bending stress of the main reinforcement (1o) in the slab (3) by the reinforcement member (6) and the through reinforcement (5).
It acts so that it is transmitted to the steel pipe column (2) via.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing one embodiment of a joint structure between a steel pipe column and a slab in a flat slab structure according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention.

As shown in FIGS. 1 and 2, the flat slab structure 1 has a slab 3 constructed horizontally, and a steel pipe column 2 made of a steel pipe 2a stands vertically on the slab 3. It is set up. At the intersection 1a between the slab 3 and the steel pipe column 2, a through reinforcement 5 consisting of an upper reinforcement 5b and a lower reinforcement 5c is provided so as to penetrate the steel pipe column 2 in the horizontal direction from multiple directions of the steel pipe 2a. Both sides of the upper reinforcement 5b and the lower reinforcement 5c are fixed to the steel pipe 2a by holding nuts 5a, 5a. A reinforcing iron plate material 6 having a length of Ll is attached to both ends of the through reinforcement 5 consisting of a pair of upper reinforcement 5b and lower reinforcement 5c via connecting nuts 7.7,
6 are connected, and each reinforcing iron plate material 6 has a pair of reinforcing reinforcing bars 6a, 6a connected to the upper reinforcing bars 5b and the lower reinforcing bars 5c. A reinforcing steel plate 6b made of a plate-shaped steel plate is provided between the pair of reinforcing reinforcing bars 6a, 6a to connect both the reinforcing bars 6a, 6a, and the reinforcing steel plate 6b is a flat slab structure. It is installed so that it passes through the dangerous cross section C8 where the risk of shear failure due to the shear stress generated around the column No. 1 is highest. In addition, in the slab 3, there are many main reinforcements 1o.
are installed in the horizontal direction, and among the main reinforcements 10, the steel pipe 2a
The end of the main reinforcing bars 10 installed to intersect with the reinforcing bars 6a, 6a of the reinforcing iron plate material 6 has a lapped portion 10b having a length L2. Also, the tip 10 of the main reinforcement 1o
a does not intersect with the steel pipe 2a, and the wall surface 2b of the steel pipe 2a
They are installed facing each other with a slight gap GP in between.

Since the flat slab structure 1 has one or more configurations, the steel pipe columns 2
The shear stress that leads to shear failure occurring around the slab 3 is supported by the reinforcing iron plate 6b provided so as to pass through the critical cross section C8, and punching failure of the slab 3 is prevented.

Further, the bending stress within the slab 3 is supported by the main reinforcement 10, transmitted to the reinforcing steel plate material 6 via the lap portion 10b, and transmitted to the steel pipe column 2 portion by the reinforcing reinforcing bar 6a of the steel plate material 6 and the through reinforcement 5. . Therefore, the main reinforcement 10 is the steel pipe 2 of the steel pipe column 2.
The bending stress within the slab 3 is smoothly transmitted to the steel pipe column 2 side via the main reinforcing bars 10 even if it is not provided so as to penetrate through the inside of the slab 3.

In addition, in the above-mentioned embodiment, as shown in FIG.
Although the case has been described in which the reinforced iron plate material 6 having the reinforced iron plate 6b is provided, the present invention can be applied to any configuration as long as the through reinforcement 5 is provided with a reinforcing member capable of supporting the shear stress at the critical cross section O8 of the slab 3. Of course, this is a good thing, and for example, as shown in FIG. 2, it is of course possible to connect a truss bar 9 as a reinforcing member.

(g) 0 Detailed Description of the Invention According to the present invention, the present invention has a slab 3 provided with main reinforcements 10 arranged horizontally, and a steel pipe column 2 having a steel pipe 2a is erected on the slab 3. In the flat slab structure 1 made of
A plurality of through bars 5 consisting of upper reinforcements 5b, lower reinforcements 5c, etc. are arranged vertically to pass through the steel pipe 2a, and reinforcing members such as reinforcing steel plates 6, truss reinforcements 9, etc. are attached to these through reinforcements 5. Connect in such a way that it passes through the dangerous cross section C8 of shear failure.

The main reinforcing bars 1o are configured by wrapping with the reinforcing members, and the main reinforcing bars 1o are installed without penetrating the inside of the steel pipe 2a, so that the slab 3 at the column-beam intersection 1agiJ side of the flat slab structure 1 The shear stress generated in the cross section C5 is effectively supported by the reinforcing member installed so as to pass through the critical cross section C5, thereby making it possible to prevent punching failure from occurring.

Furthermore, since the bending stress supported by the main reinforcement 10 in the slab 3 is transmitted to the steel pipe column 2 via the reinforcing member and the through reinforcement 5, the main reinforcement 10 does not need to be provided to penetrate inside the steel pipe 2a. The bending stress acting on the steel pipe column 10 is smoothly transmitted to the steel pipe column 2. Therefore, there is no need to provide the main reinforcement 10 inside the steel pipe 2a, so even if a reinforcing member is provided via the through reinforcement 5 to support the shear stress generated in the slab 3 around the steel pipe column 2, the reinforcement member 10 is not provided inside the steel pipe 2a. It is possible to prevent the occurrence of a situation where the concrete is complicated, and it is possible to perform the work of placing concrete inside the steel pipe 2a without hindering the fluidity of the concrete due to the complicated reinforcing bars. It is possible to exhibit the filling properties of

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of a joint structure between a steel pipe column and a slab in a flat slab structure according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention. 2a...Steel pipe 3...Slab 5...Through bar 6...Reinforcement member (reinforced iron plate material) 9...
Reinforcement member (truss bar) 10...Main bar CS...Dangerous section

Claims (1)

[Claims] In a flat slab structure having a slab provided with main reinforcing bars arranged horizontally, and a steel pipe column having a steel pipe erected on the slab, the steel pipe at the intersection of the column and the slab A plurality of through bars are arranged vertically so as to penetrate through the steel pipe, and reinforcing members are connected to the through bars so as to pass through a cross section at risk of shear failure, and the main bars are wrapped with the reinforcing members. A joint structure between a steel pipe column and a slab in a flat slab structure, wherein the main reinforcement is installed without penetrating the inside of the steel pipe.