JPH0949266A - Connecting method for steel pipe member filled with reinforced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten shearing resistance to the bending of a steel pipe column filled with concrete, and to heighten the strength of connection by preventing shearing stress from scattering at a connection part, at the time when the steel pipe columns, upper and lower, are connected with each other. SOLUTION: A reinforcing cage is placed near the inner-surface side of a steel pipe 2. After centrifugal molding, concrete is filled into a hollow part 11 at the central part which is formed thereby, and a solid column is formed, and thus a steel pipe member 1 is manufactured. In the case where the steel pipe members 1 are connected with each other, the end parts of main reinforcements, which are projected upward from the steel pipe member at the lower position, are put into a space part 7 formed between main reinforcement-securing member 6 and the steel pipe member 1 at the upper position, and beveled parts between the steel pipe members 1, upper and lower, are connected by welding. After that, grout is filled into the whole space part formed at the connected site, and all of them are integrally combined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting reinforced concrete-filled steel pipe members, and more particularly to a method for connecting reinforced concrete-filled steel pipe members for constructing building columns using steel pipes.

[0002]

2. Description of the Related Art Conventionally, there is known a reinforced concrete-filled steel pipe member in which a main bar and a hoop bar are incorporated in a steel pipe, concrete is poured into the inside of the steel pipe column, and centrifugal molding is performed. When connecting the reinforced concrete-filled steel pipe member, there is a method of welding to the end portion of the reinforced concrete-filled steel pipe member via a metal plate (end face metal fitting), or a sleeve joint method using a sleeve at the main reinforcement joint.

[0003]

In the welding and joining method using the end face metal fittings of the reinforced concrete filled steel pipe member, stress is not transmitted because the main bars are not connected. Also,
In the sleeve joint method, since the sleeve diameter is larger than the main bar diameter, the PCD (pitch circle) of the main bar is brought inward, and the strength becomes weaker accordingly, and the main bar diameter becomes thicker, resulting in uneconomical bar arrangement.

Therefore, the main bars are arranged to the outside (inner side of the steel pipe) as much as possible, and the main bars can be joined together, and
A technical problem to be solved in order to effectively increase the cross-sectional efficiency arises, and an object of the present invention is to solve the problem.

[0005]

The present invention has been proposed in order to achieve the above-mentioned object, and after incorporating a main bar and a hoop bar near the inner peripheral surface of a steel pipe and performing centrifugal molding of concrete, The upper end of the main bar is projected to the upper end of a reinforced concrete-filled steel pipe member formed by filling concrete or mortar into the hollow portion formed by the centrifugal molding, and further, the reinforced concrete-filled steel pipe member. A lower end reinforced concrete-filled steel pipe having an outer portion fixed to the inner surface of the steel pipe and having a main space locking member having a predetermined space between the steel pipe and the steel pipe. Reinforcing bar concrete of the upper stage inserted into the space formed at the lower end of the reinforced concrete-filled steel pipe member of the upper stage to which the main bar protruding from the upper end of the member is to be connected Abuts the over preparative filled tubular member, further,
A method for connecting a reinforced concrete-filled steel pipe member is provided, in which a groove of the abutting portion is welded and a grout material is injected into each space formed in the joining portion through a grout material injection hole to join the groove portion.

[0006] Here, the main bar is projected from the upper end of the reinforced concrete-filled steel pipe member, the main bar locking member is fixed to the lower end, and the outer wall of the main bar locking member and the inner surface of the steel pipe are fixed. Since a predetermined space is formed between and, the lower end of the upper reinforced concrete-filled steel pipe member to be joined to the upper end of the lower-stage reinforced concrete-filled steel pipe member is polymerized. At this time, the main bar protruding on the upper surface of the lower-stage steel pipe member is inserted into the space formed by the main-bar locking member of the upper-stage steel pipe member to be joined, and the groove of the overlapping portion is formed. Since the grout material is injected and filled into the spaces formed in the joint portions of the upper and lower steel pipe members by welding, the joint portions are also integrally joined by the main bar and the grout material, and the joint portions It becomes possible to construct a pillar of a building that is strong in combination with the large strength of the reinforced concrete-filled steel pipe member itself.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 show one embodiment of centrifugal molding of a reinforced concrete filled steel pipe member (hereinafter, simply referred to as a steel pipe member 1). 2 in the figure
Is a steel pipe. The steel pipe 2 is not limited to a circular pipe and may be a rectangular pipe.

A rebar cage, which will be described later, is fitted and inserted near the inner peripheral surface of the steel pipe 2. The reinforcing bar cage is composed of main bars 3, 3, ... Which are called deformed bars arranged in a circular shape or a rectangular shape, and hoop bars 4, 4, ... Are wound around the main bars.

Further, W nuts 5, 5, ... Are set at one ends of the main bars 3, 3 ,.
Inside one end of one of the flanges 6 projecting outward from one end
The cylindrical wall portion 6b having a is formed in a taper shape that widens outward, and the main bar locking member 6 having a constant space portion 7 is provided between the tubular wall portion 6b and the inner side surface of the steel pipe 2. Then, the peripheral edge portion of the collar portion 6a is fixed to the inside of one end portion of the steel pipe 2 by means such as welding. At this time, the outer end surface of the tubular wall portion 6b is formed substantially flush with the end surface of the steel pipe 2, and the other end portion of the steel pipe 2 is opened without disposing the main bar locking member. There is.

Further, the collar portion 6a of the main bar locking member 6 is formed with insertion holes 6c, 6c ... For the main bars 3, 3 ,. Therefore, the rebar cage is fitted into the steel pipe 2 with the portion where the W nuts 5, 5, ... Are set before the end portion of the release portion of the steel pipe 2. .. are inserted into the insertion holes 6c, 6c .. When the rear nut abuts the insertion holes 6c, 6c .. The main bars 3, 3 ... Are fixed to the main bar locking member 6.
Further, the main bars 3, 3, ... May be locked to the main bar locking member 6 of the main bar locking member 6 without using the nut. At this time, the end portions 3a, 3a of the main bars 3, 3 on the opposite side of the W nuts 5, 5 ... Are made to project outward from the end surface of the steel pipe 2.

Further, the main bars 3, 3, ... Shown in FIGS.
The main bar locking member 6 side is immersed in the space 7, but the main bars 3, 3, ... Shown in FIGS. 3 and 4 are the steel pipes 2 even on the main bar locking member 6 side. Projects outward from the lower end surface of the.

Therefore, concrete is poured into the steel pipe 2 in which the reinforcing bar cage is inserted and centrifugally molded. At this time, both end surfaces of the centrifugally molded concrete 8 are formed on the inner side with a distance of L and La respectively from both end surfaces of the steel pipe 2. Therefore, the grout material injection hole 9 provided in the upper end portion of the steel pipe 2 and the air vent hole 10 provided in the space portion 7 formed by the main bar locking member 6 are closed by the concrete 8. There is no.

Further, as shown in FIGS. 2 and 4, a hollow portion 11 at the center of the concrete 8 formed by centrifugal molding.
Is filled with concrete 12 to form the solid columnar steel pipe member 1. In this way, the formed steel pipe member 1 is integrated as a whole and has an extremely large axial force.

5 to 8 show a method of connecting the steel pipe member 1 described above. In FIG. 5 and FIG. 7, the steel pipe member 1 of the upper stage is brought into contact with the steel pipe member 1 of the lower stage, and the grooves 13, 13 formed at the respective ends are butted and welded here 14 . At this time, the end portions 3a, 3a of the main bars 3, 3 ... Are projected from the upper end portion of the lower-stage steel pipe member 1, and
The end portions 3a, 3a ... Are inserted into the space portion 7 formed by the main bar locking member 6, respectively. Thus, the upper and lower main bars 3, 3, ... Are in a butt shape with each other in FIGS. 5 and 6, but are overlapped with each other in FIGS. 7 and 8. .

Spaces 15 and 15 are formed at the connecting portions of the upper and lower steel pipe members 1 and 1 by the intervals L and La between the end faces of the concrete 8 and 12 and the end face of the steel pipe 2. Therefore, as shown in FIGS. 6 and 8, the grout material 16 is injected through the lower-stage grout material injection hole 9. Then, by continuing the injection operation until the grout material 16 flows out from the air bleeding hole 10 provided in the steel pipe member 1 in the upper stage, the grout material 16 has all the space portions 7 formed in the connecting portion. , 15, 15 are filled, and the upper and lower steel pipe members 1, 1 are integrally and firmly joined together with the end portions 3a, 3a of the lower main bars 3, 3 ,.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

According to the present invention, as shown in the above-described one embodiment, the steel pipe member has a large bending shear strength, and when connecting, the connecting portions are wholly connected integrally. Thus, it is an invention that has an extremely significant effect, such as constructing an extremely strong column and contributing to cost reduction.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a centrifugally formed steel pipe member used in an embodiment of the present invention during forming.

FIG. 2 is a vertical cross-sectional side view when the hollow portion of the steel pipe member of FIG. 1 is filled with concrete to form a solid columnar steel pipe member.

FIG. 3 is a vertical cross-sectional side view of another centrifugally formed steel pipe member used in an embodiment of the present invention during forming.

FIG. 4 is a vertical cross-sectional side view when the hollow portion of the steel pipe member of FIG. 3 is filled with concrete to form a solid pipe steel pipe member.

FIG. 5 is a vertical cross-sectional side view showing a method of connecting the steel pipe members of FIG. 1 when a grout material is not injected.

FIG. 6 is a vertical cross-sectional side view when the grout material is injected in FIG.

FIG. 7 is a vertical cross-sectional side view showing a method of connecting the steel pipe members of FIG. 3 when a grout material is not injected.

8 is a vertical cross-sectional side view when the grout material is injected in FIG.

[Explanation of symbols]

 1 Reinforced concrete filled steel pipe member 2 Steel pipe 3 Main bar 4 Hoop bar 6 Main bar locking member 7, 15 Space part 8, 12 Concrete 9 Grout material injection hole 10 Air vent hole 13 Groove 14 Weld 16 Grout material

Claims (1)

[Claims] 1. A solid columnar body is prepared by incorporating a main bar and a hoop bar near the inner peripheral surface of a steel pipe, performing centrifugal molding of concrete, and then filling the hollow portion formed by the centrifugal molding with concrete or mortar. The upper end of the main bar is projected to the upper end of the reinforced concrete-filled steel pipe member formed, and the outer end is fixed to the inner side of the steel pipe at the lower end of the reinforced concrete-filled steel pipe member, and between the steel pipe A main bar locking member having a predetermined space is provided, and a reinforced concrete filling of a lower stage to be connected. A reinforced concrete filling of an upper stage to be connected with the main bar protruding from the upper end of a steel pipe member. The steel pipe member is inserted into the space formed at the lower end of the steel pipe member to abut the upper-stage reinforced concrete-filled steel pipe member. A method for connecting reinforced concrete-filled steel pipe members, characterized by injecting grout material into each space formed in the joining portion through a joining material injection hole and joining.