JPH07292770A - Connective structure between corner post and beam - Google Patents

Abstract

PURPOSE:To make sufficient connective strength securable with short anchor length by using a deformed steel pipe, thereby capable of dispensing with any bending operation of a main reinforcement, and to improve a connective working property between a precast corner post member precast as a whole and a precast beam member or cost-in-place beam member. CONSTITUTION:A coupling deformed steel pipe 1, where a projecting rib to heighten the extent of binding power and/or sticking force in concrete and mortar or the like is formed almost over the whole range of both inner outer circumferential surfaces, is embedded almost horizontally in a specified part of a precast corner post member 3. Then, one end of the deformed steel pipe 1 almost reaches a surface of the PC corner post 3 and opened, while the other end is made into a state of being blocked up. A beam reinforcing reinforcing bar 6 of a reinforced concrete beam 5 is inserted into the deformed steel pipe 1 in the PC corner post member 3, while a grout material such as mortar 7 is filled up in a residual space in the deformed steel pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated construction method or a semi-prefabricated construction method of a reinforced concrete building using a pillar member or a beam member made of precast concrete (hereinafter referred to as PC), and more specifically, The present invention relates to a connection structure between a corner pillar and a beam that enhances the strength of the connection portion between the PC corner pillar member and the beam member.

[0002]

2. Description of the Related Art As is well known, when a building is constructed by using a PC member, the PC member is built on site and integrally connected with other concrete members. The most common connection structure and construction method for this purpose are as follows.

First, a reinforcing bar corresponding to a connecting bar is preliminarily provided on the connecting end surface of the PC member, and the P
Reinforcing bars corresponding to connecting bars are also provided in a projecting manner at connection sites of other concrete members (cast-in-place concrete members or other PC members) installed on site before the C member. Then, the PC member is built in at a predetermined position, the connection end face and the connection portion of another concrete member are opposed to each other at a predetermined interval, the reinforcing bars protruding from both are overlapped with each other, and the lap joint portion is A formwork is installed so as to surround it, and concrete is placed in the formwork to form a lap joint.

In particular, a precast concrete corner post,
For the structure and construction method to join the beam, please refer to
The proposal of the 001 publication is known. In this proposal, the column main bar projecting from the upper end surface of the precast concrete column and the beam main bar projecting from the beam end are joined to each other. In particular, in the structure of this joint part, the lower beam of the beam is bent up along the main bar of the column to secure the anchoring length, and the main bar of the beam is moved toward the beam side so as to approach the upper end of the beam. It was bent.

[0005]

By the way, in such a conventional joint structure of a precast concrete corner pillar and a beam, it is necessary to bend the reinforcing bar in order to secure a fixed length. And this work was difficult and complicated. Further, even if the fixing length is secured by bending the main bar, the length that can be bent is limited by the width and beam of the ready-made precast concrete columns. Furthermore, regarding the work of joining the corner post and the beam, since it is necessary to bend these main bars, it is not enough to simply join the precast members directly to each other.
The corner post and the beam member had to be joined by joining the cast-in-place concrete.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to make it possible to obtain sufficient connection strength with a short fixing length by utilizing a deformed steel pipe. The purpose is to eliminate the work of bending the main bar and improve the workability of connecting the precast PC corner pillar member and the PC beam member or the cast-in-place beam member wholly precast.

[0007]

According to the present invention, a hollow cylindrical body is formed, and the inner peripheral surface and the outer peripheral surface thereof are almost entirely disposed between the peripheral surface and a reinforcing member adjacent to the peripheral surface. A deformed steel pipe for joints, in which irregularities are formed for transmitting stress through concrete or mortar, is embedded almost horizontally in a predetermined portion of a PC corner post member, and one end of the deformed steel pipe is connected to the PC corner post member. Reinforcing bars of a reinforced concrete beam member, which is provided by connecting to the PC corner post member and being almost open to the surface and opening at the other end of the PC, are connected to the PC.
While inserting into the deformed steel pipe in the corner post member,
The remaining space in the deformed steel pipe is filled with grout material such as mortar.

[0008]

[Function] When a deformed steel pipe having the irregularities formed on the inner and outer peripheral surfaces is embedded in concrete, the irregularity of the deformed steel pipe dramatically improves the bonding force, adhesion, and fixing force with the concrete. . When the reinforcing steel is inserted into the deformed steel pipe and the grout material is filled, the deformed steel pipe has an extremely large bonding force / adhesive force / fixing force between the grout material and the steel pipe due to the unevenness of the inner peripheral surface, and therefore the steel pipe concerned A large resistance force is generated with respect to the pulling-out force of the reinforcing bar inserted in, and the reinforcing bar can be prevented from slipping out, so that a lap joint having high strength can be configured. In addition, since the grout material in the deformed steel pipe has a restraining effect due to the rigidity of the deformed steel pipe itself, the compressive force can be retained even after adhesion shear cracking occurs, so that the actual strength of the grout material filled therein increases. To do. That is, adhesive shear fracture is less likely to occur.

Therefore, in connecting the beam member to the PC corner pillar member in which the above-mentioned deformed steel pipe for joint is buried,
It is possible to obtain a strong connection structure based on the principle of the lap joint under the extremely easy and good workability of only inserting the reinforcing bar into the deformed steel pipe and filling the grout material.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A schematic structure of an embodiment of a PC corner post member 3 to which the present invention is applied is shown in FIGS. 1 and 2, and FIG.
The outline of the connection structure of C corner pillar member 3 and a beam is shown. The present embodiment is basically formed into a hollow cylindrical body, and substantially over the entire inner peripheral surface and the outer peripheral surface thereof, between these peripheral surfaces and a beam reinforcing bar 6 as a reinforcing member arranged adjacently. The deformed steel pipe for joint 1 in which the convex ribs 2 for transmitting the stress through the concrete or mortar is formed is embedded almost horizontally in a predetermined portion of the PC corner post member 3, and one end of the deformed steel pipe 1 is The PC corner pillar member 3 is in a state in which it almost reaches the surface of the PC corner pillar member 3 and opens, and the other end is closed.
The beam rebar 6 of the reinforced concrete beam member 5 connected to and is inserted into the deformed steel pipe 1 of the PC corner post member 3 and the remaining space in the deformed steel pipe 1 is filled with grout material 7 such as mortar. It is composed of

As shown in the figure, the shape of the PC corner pillar member 3 is a prism, and the basic structure thereof is the same as that of a general PC corner pillar member. A feature of the PC corner pillar member 3 according to the present invention is that a deformed steel pipe 1 for connection for connection with a beam is embedded near the upper end portion thereof. In this embodiment, four deformed steel pipes 1 are horizontally embedded at a predetermined interval, the length of each deformed steel pipe 1 is slightly shorter than the width of the PC corner post member 3, and one end of the deformed steel pipe 1 is The PC corner post member 3 is almost reached and opened, and the other end of the deformed steel pipe 1 is closed by a lid member 4 welded thereto. In this way, four openings connected to the inside of the deformed steel pipe 1 are formed on the beam joint surface of the PC corner member 3. As shown in FIG. 3, if necessary, the end of the deformed steel pipe 1 closed by the lid member 4 may reach the surface of the PC corner post member 3.

FIG. 6 shows an example of a specific form of the deformed steel pipe 1. This steel pipe 1 is made by casting or forging, and its dimensions are set according to the application conditions. Generally, the inner diameter is about 5 to 15 cm, and the wall thickness is 0.2 to 1 cm. It is of a degree. In order to integrate the steel pipe 1 and the beam reinforcing bar to function as a lap joint, convex ribs 2 having an appropriate pattern are formed on almost the entire inner peripheral surface and the outer peripheral surface of the steel pipe 1. The convex rib 2 of this embodiment has the same pattern as the convex rib of the deformed steel bar used as a general reinforcing bar,
It is composed of a large number of horizontal ribs arranged in the circumferential direction and vertical ribs extending in the axial direction. The height of the convex rib 2 is 1 of the wall thickness of the steel pipe 1.
/ 5 to 2 times, and the pitch of the horizontal rib is 1
It is desirable to set the inner diameter to 1/2 or less. It is a major feature of the present invention that the deformed steel pipe 1 having the uneven pattern formed on the inner peripheral surface and the outer peripheral surface by the convex rib 2 is used as a joint.

The PC corner pillar member 3 is built in the site and, as shown in FIG. 4, the beam member 5 is connected to one side of the corner pillar member 3 to be provided. This beam member 5 is usually made of cast-in-place concrete, but it is also possible to use a PC beam member in some cases. The feature of the connection structure of the present invention is that the beam reinforcing bars 6 projecting from the connection end surface of the beam member 5 are inserted into the deformed steel pipe 1 of the PC corner pillar member 3 and the remaining space of the deformed steel pipe 1 does not exist. This is the point of filling the shrinkable mortar 7.

When the mortar 7 filled in the deformed steel pipe 1 is hardened, the beam rebar 6 inserted in the steel pipe 1 as shown in FIG.
P with sufficient strength through the mortar 7 and the deformed steel pipe 1.
It is connected to the C corner post member 3. In other words, since the irregularities are formed on the inner peripheral surface and the outer peripheral surface of the deformed steel pipe 1 as described above, the bonding force, adhesion force, and fixing force between the deformed steel pipe 1 itself and the concrete of the PC corner post member 3 are extremely high. In addition, the bonding force, the adhesive force, and the fixing force between the filled mortar 7 and the deformed steel pipe 1 are very large, and therefore the beam rebar 6 inserted into the deformed steel pipe 1 and the deformed steel pipe 1 have a lap joint. Large stress can be transmitted as in the principle. Explaining this point in more detail, since the inner peripheral surface area of the deformed steel pipe 1 surrounding the beam reinforcing bar 6 is larger than the outer peripheral surface area of the beam reinforcing bar 6, the deformed steel tube is resisted against the pulling force acting on the beam reinforcing bar 6. Stress generated on side 1 (adhesive shear stress)
Has a large inner peripheral surface area, so that it is reduced and relaxed, and therefore, it is possible to eliminate the need for other local reinforcement to this joint portion and its peripheral portion, and It is possible to ensure simplification.
As a result, an extremely large resisting force is generated against the pull-out force of the beam rebar 6, and the beam rebar 6 can be strongly prevented from coming off.

The number of deformed steel pipes 1 to be installed is not limited to the above examples, but can be arbitrarily set as required.

[0016]

According to the present invention, a deformed steel pipe having irregularities formed on the inner peripheral surface and the outer peripheral surface is embedded in concrete, so that the irregular steel pipe has a bonding force / adhesive force / fixation with concrete due to the irregularities on the surface. Power is dramatically improved.
When the beam rebar is inserted inside the deformed steel pipe and the grout material is filled, the bonding force / adhesive force / fixing force between the grout material and the steel pipe is extremely large due to the unevenness of the inner peripheral surface, and therefore, it is inserted into the steel pipe. A large resistance force is generated against the pulling-out force of the beam rebars that are present, and the beam rebars can be prevented from coming off, so that a lap joint having high strength can be obtained. In addition, since the grout material in the deformed steel pipe has a restraining effect due to the rigidity of the deformed steel pipe itself, the compressive force can be retained even after adhesion shear cracking occurs, so that the actual strength of the grout material filled therein increases. . That is, adhesive shear fracture is less likely to occur.

Therefore, in connecting the beam member to the PC corner pillar member in which the above-mentioned deformed steel pipe for joint is buried,
It is possible to obtain a strong connection structure based on the principle of the lap joint under extremely easy and good workability of only inserting the reinforcing bar into the deformed steel pipe and filling the grout material.

By using the deformed steel pipe, the fixing length can be shortened while securing sufficient connection strength for the joint portion between the corner post and the beam member, and the conventional bending work of the main bar can be eliminated. At the same time, this also eliminates the need to construct the joint between the corner post and the beam by post-casting concrete, which can significantly improve the connection workability and reduce the length of the reinforcing bar required for bending, which reduces the material cost. It can also be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a PC corner post member to which the present invention is applied.

FIG. 2 is a cross-sectional view of a main part of the above PC corner pillar member.

FIG. 3 is a sectional view of an essential part showing another example of the sectional configuration of the PC corner pillar member of the above.

FIG. 4 is a cross-sectional view of essential parts in a state where a PC corner pillar member and a beam member having the configuration of FIG.

FIG. 5 is a detailed view for explaining the stress transmitting function in the above connected state.

FIG. 6 is a configuration diagram showing a specific example of a deformed steel pipe used in the above PC corner pillar member.

[Explanation of symbols]

 1 Deformed steel pipe 2 Convex rib 3 PC corner post member 4 Lid member 5 Beam member 6 Beam rebar 7 Mortar

Claims (1)

[Claims] 1. A stress transmission through a concrete or mortar between a peripheral member and a reinforcing member which is formed adjacent to the inner peripheral surface and the outer peripheral surface of the hollow cylindrical member and is disposed adjacent to the peripheral member. A deformed steel pipe for a joint, in which unevenness for performing the above is formed, is embedded substantially horizontally in a predetermined portion of the PC corner post member, and one end of the deformed steel pipe almost reaches the surface of the PC corner post member and opens. The other end of the PC corner post member is connected to the PC corner post member, and the reinforcing bar of the beam member made of reinforced concrete is inserted into the deformed steel pipe of the PC corner post member, and the remaining space in the deformed steel pipe. A connection structure of a corner post and a beam, which is characterized by filling grouting material such as mortar into the interior.