JPH07292858A - Structure for connecting pc member - Google Patents

Abstract

PURPOSE:To conduct the connection operation of two PC members, and to ensure high strength required. CONSTITUTION:Irregular-shaped steel pipes 1a, 1b, in which projecting ribs for increasing bonding power and adhesion with concrete, mortar, etc., are formed extending over approximately the whole of an inner circumferential surface and an outer circumferential surface, are buried to PC members 30, 40, and the first irregular-shaped steel pipe 1b is made in the state, in which the steel pipe 1b is mounted vertically to the joint surface of the PC member 40 and one end section is opened to the joint surface of the PC member 40, while the second irregular-shaped steel pipe 1a is brought to the state, in which the steel pipe 1a is installed vertically to the joint surface of the PC member 30 and one end section is projected from the joint surface of the PC member 30. When the PC members 30, 40 are built on a field and both joint surfaces are faced oppositely, the second irregular-shaped steel pipe la projected from the Joint surface of the PC member 30 is inserted into the first irregular-shaped steel pipe 1b opened to the joint surface of the PC member 40 while a residual space in the first irregular-shaped steel pipe 1b is filled with a grout material such as mortar 5.

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 structural member made of precast concrete (hereinafter referred to as PC), and more particularly to a connection structure of a PC member and a PC member. Is.

[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.

A method in which the lap joint in the above connection structure / construction method is replaced with a gas pressure welding joint, a welded joint, or a mechanical joint is often adopted. Further, a splice sleeve method using a grout material-filled joint which is a kind of mechanical joint is also known (for example, Japanese Patent Publication No. 4-52815).

[0005]

As described above, in the construction method in which a formwork is installed at the connecting portion between the PC member and another concrete member and concrete is placed, the work of installing and removing the formwork is troublesome. There is a basic problem. Further, when connecting the reinforcing bars of the connecting portion with a gas pressure welding joint or a welding joint, there are disadvantages that the positioning and connecting work of the reinforcing bars are extremely troublesome and that even a small amount of rain cannot work. In this respect, the above-mentioned splice sleeve method simplifies the work at the site, which is useful for rationalizing the prefabricated method or semi-prefabricated method for reinforced concrete buildings.

[0006] By the way, in the splice sleeve method, a plurality of cylindrical cast iron sleeves and a plurality of deformed rebars having one end inserted into each of them are embedded in one concrete member to be connected to each other, and the other one is embedded. A plurality of deformed reinforcing bars to be inserted into the sleeve are embedded in the concrete member, the deformed reinforcing bars of the other concrete member are butted against the sleeve of one concrete member, and both deformed reinforcing bars are butted in the sleeve. The sleeve is filled with grout material for connection. Since this splice sleeve method is used to join deformed rebars to each other by butt-joining, the sleeve has a diameter larger than the outer diameter of the deformed rebars so that the cores of a pair of deformed rebars to be inserted can be aligned. It is formed with a slightly larger diameter so that there is almost no gap between it and the deformed reinforcing bar inserted. And this construction method requires that a plurality of deformed reinforcing bars of the other concrete member be simultaneously inserted into a plurality of such sleeves at the same time. For this reason, when connecting the deformed bars and the sleeves, the positioning of the deformed bars and the sleeves is complicated and requires a lot of work time, resulting in poor workability. It has been required that a high manufacturing accuracy be required for the formation of. Further, in order to make the joint strength in the sleeve sufficient, it is necessary to set the joint length portion to be considerably long, which increases the sleeve length and the insertion length of the deformed reinforcing bar, which also increases the material cost. It was supposed to be.

On the other hand, in connection with this splice sleeve construction method, when a cylindrical steel pipe having smooth inner and outer peripheral surfaces is used and a pair of reinforcing bars is inserted thereinto to form a joint, the smooth inner -There was a problem that the inserted reinforcing bars tended to slip out due to the outer peripheral surface. In addition, when using a thin-walled spiral sheath tube, the constraint effect of the sheath tube on the grout material filled inside cannot be expected, so in order to compensate for this, the length of the sheath tube etc. should be set long. It is necessary to make the joint portion long, which increases the material cost.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to simplify the work of connecting two PC members and to secure a required high strength.

[0009]

In view of the above, according to the present invention, a hollow cylindrical body is formed, and the inner peripheral surface and the outer peripheral surface of the hollow cylindrical body are arranged substantially adjacent to the other peripheral surface. The first deformed steel pipe for joints, in which unevenness is formed for transmitting stress between concrete and mortar,
It is arranged perpendicular to the joint surface of the first PC member, and one end of the first deformed steel pipe is opened to the joint surface of the first PC member, and the interior is filled with concrete or mortar. The stress is transmitted through concrete or mortar between the inner peripheral surface and the outer peripheral surface of the hollow cylindrical body, and almost all of the inner peripheral surface and the outer peripheral surface of the hollow cylindrical body. The unevenness for making it,
The second deformed steel pipe for joint having a diameter smaller than that of the first deformed steel pipe is arranged perpendicularly to the joint surface of the second PC member, and one end of the second deformed steel pipe is connected to the second PC. The first PC member and the second PC member are built in the site so that both joint surfaces face each other, and the first PC member and the second PC member are protruded from the joint surface of the second PC member. The second deformed steel pipe is inserted into the first deformed steel pipe opened on the joint surface of the first PC member, and the remaining space in the first deformed steel pipe is filled with grout material such as mortar. It is characterized by

[0010]

[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. . Therefore, the first deformed steel pipe is firmly fixed to the concrete of the first PC member, and the second deformed steel pipe is firmly fixed to the concrete of the second PC member. Then, when the second deformed steel pipe is inserted into the first deformed steel pipe and the grout material is filled between the two, the unevenness of the inner peripheral surface of the first deformed steel pipe causes the bonding force between the grout material and the steel pipe. It is possible to secure a very large adhesion and fixing force, and also a very large coupling force, adhesion force and fixing force between the grout material and the steel pipe due to the unevenness of the outer peripheral surface of the second deformed steel pipe. Moreover, the facing area between the inner peripheral surface of the first deformed steel pipe and the outer peripheral surface of the second deformed steel pipe via the grout material is very large. Further, due to the restraining effect of the rigidity of the deformed steel pipe itself, the actual strength of the grout material filled therein increases. As a result, the first
A concrete stress of the PC member-first deformed steel pipe-grout material-second deformed steel pipe-concrete of the second PC member, a strong stress transmission path based on the principle of the lap joint,
The two PC members are strongly connected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The outline of one embodiment of the present invention is shown in FIGS. The present embodiment is basically formed into a hollow cylindrical body, and over almost the entire inner peripheral surface and outer peripheral surface thereof, concrete or mortar is provided between these peripheral surfaces and other members arranged adjacently. The first deformed steel pipe for joint 1b on which the convex rib 2 for transmitting the stress is formed through the first P
It is arranged perpendicular to the joint surface of the C member 40,
One end of the first deformed steel pipe 1b is opened to the joint surface of the first PC member 40, and on the other hand, it is formed into a hollow cylindrical body filled with concrete or mortar, and A convex rib 2 is formed over almost the entire peripheral surface and the outer peripheral surface for transmitting stress between the peripheral surface and other members arranged adjacently via concrete or mortar. 2nd diameter smaller than deformed steel pipe 1b
The deformed steel pipe for joint 1a is arranged perpendicular to the joint surface of the second PC member 30, and the second deformed steel pipe 1
One end of a is projected from the joint surface of the second PC member 30, the first PC member 40 and the second PC member 30 are built in the site, and both joint surfaces are opposed to each other. Two
The second deformed steel pipe 1a protruding from the joint surface of the PC member 30 is inserted into the first deformed steel pipe 1b opening at the joint surface of the first PC member 40, and the first deformed steel pipe 1a is also inserted. The remaining space inside is filled with grout material 5 such as mortar.

This embodiment relates to a connecting structure in which the PC pillar members 30 and 40 are added up and down. The lower second PC pillar member 30 is first erected on the site, and the first PC pillar member 40 is connected thereto.

A second deformed steel pipe 1a is embedded in the upper end portion of the PC pillar member 30, and about half of this deformed steel pipe 1a projects upward from the center of the upper end joint surface of the pillar member 30. The inside of the deformed steel pipe 1a is filled with concrete. Further, a retaining key 3 is provided at the lower end of the deformed steel pipe 1a.
1 is fixed, and this also enhances the fixing power with concrete.

FIG. 4 shows an example of a concrete form of the deformed steel pipe 1a. This steel pipe 1a is made by casting or forging, and its size is set according to the application conditions, but generally, the inner diameter is about 5 to 15 cm, the length is about 50 to 300 cm, The wall thickness is about 0.2 to 1 cm. In order to make this steel pipe 1a function as a lap joint, convex ribs 2 having an appropriate pattern are formed on almost the entire inner peripheral surface and outer peripheral surface of the steel pipe 1a. The convex rib 2 of this embodiment is
The pattern is similar to the convex rib of the deformed steel bar used as a general reinforcing bar, and includes a large number of lateral ribs arranged in the circumferential direction and vertical ribs extending in the axial direction. It is desirable that the height of the convex rib 2 is set to about 1/5 to 2 times the wall thickness of the steel pipe 1a, and the pitch of the lateral ribs is set to 1/2 or less of the inner diameter of the steel pipe 1. It is a major feature of the present invention that the deformed steel pipe 1a 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.

Further, in the PC pillar member 30, a steel plate 32 is integrally joined to the upper end joint surface thereof, and
The outer circumference of the upper end portion is surrounded and reinforced by an outer peripheral steel plate 33. The ends of the column main bars 34 embedded in the PC column member 30 are welded to the steel plate 32.

In the PC column member 40 to be added above,
The first deformed steel pipe 1b is embedded in the lower end portion thereof.
Further, the steel plate 42 is integrally joined to the lower end joint surface of the PC pillar member 40, and the outer periphery of the lower end portion is the outer peripheral steel plate 4.
Surrounded by 3. The ends of the column main bars 44 embedded in the PC column member 40 are welded to the steel plate 42.

A circular hole is formed in the center of the steel plate 42, and the lower end of the first deformed steel pipe 1b is aligned with the hole and both are welded. The upper end of the first deformed steel pipe 1b is closed, and the steel pipe 1b is hollow with the hole. The first deformed steel pipe 1b has an uneven pattern similar to that of the second deformed steel pipe 1a described above on almost the entire inner peripheral surface and outer peripheral surface, and the diameter of the steel pipe 1b is 1.5 to 2 of the diameter of the steel pipe 1a. The length of the steel pipe 1b is about twice that of the steel pipe 1a.
Longer than the length of the protruding part of.

The PC pillar member 30 that has been installed upright on site
When the PC pillar member 40 is added to the top of the PC pillar member 40, as shown in FIG. 2, the second deformed steel pipe 1a protruding from the upper end of the PC pillar member 30 is opened at the lower end of the PC pillar member 40. It is inserted into the deformed steel pipe 1b, and both steel plates 32 and 42 are butted. Then, by using the mortar injection hole 45 formed so as to communicate from the outer surface of the PC pillar member 40 into the first deformed steel pipe 1b, between the second deformed steel pipe 1a and the first deformed steel pipe 1b. The non-shrinkable mortar 5 is filled in the space.

When the filled mortar 5 is hardened, both steel pipes 1a and 1b have the irregularities as described above. Therefore, the inner peripheral surface of the first deformed steel pipe 1b, the mortar 5, and the second deformed steel pipe are formed. The bonding force, adhesive force, and fixing force between the outer peripheral surface of 1a and the mortar 5 become very large. Deformed steel pipe 1
The actual strength of the mortar 5 filled therein is increased by the restraining effect of the rigidity of the a and 1b themselves. As a result, as shown in FIG. 3, the main bars 34 to P of the PC column member 30 are
Concrete of C pillar member 30 ~ Second deformed steel pipe 1a ~ Mortar 5 ~ First deformed steel pipe 1b ~ Concrete of PC pillar member 40 ~ Main reinforcement 44 of PC pillar member 40 Strong stress transmission by the principle of lap joint A path is created and the two PC pillar members 30 and 40 are strongly joined. Explaining this point in more detail, since the surface areas of the two steel pipes 1a and 1b facing each other are large, the stress (adhesive shear stress) generated on the deformed steel pipe 1 side to resist the pulling force acting between them.
Since its surface area is large, it becomes smaller and relaxed, thus eliminating the need for any other local reinforcement to this joint and its surroundings, and simplifying the reinforcement. Can be secured.

[0020]

According to the present invention, a pair of large and small deformed steel pipes having the irregularities formed on the inner peripheral surface and the outer peripheral surface are embedded in the concrete of the first and second PC members, respectively. Due to the unevenness of the surface of this deformed steel pipe, the strength of bonding, adhesion and anchoring with concrete is extremely high. Therefore, the first deformed steel pipe is firmly fixed to the concrete of the first PC member, and the second deformed steel pipe is firmly fixed to the concrete of the second PC member. Then, when the second deformed steel pipe is inserted into the first deformed steel pipe and the grout material is filled between the two,
Due to the unevenness of the inner peripheral surface of the first deformed steel pipe, it is possible to secure a very large bonding force, adhesive force, and fixing force between the grout material and the steel pipe, and due to the unevenness of the outer peripheral surface of the second deformed steel pipe, the grout material and the steel pipe concerned. It is possible to secure extremely high binding force, adhesive force and fixing force. Moreover, the facing area between the inner peripheral surface of the first deformed steel pipe and the outer peripheral surface of the second deformed steel pipe via the grout material is very large. Furthermore, the actual strength of the grout material filled in the deformed steel pipe itself increases due to the restraining effect due to the rigidity of the deformed steel pipe itself. As a result, a strong stress transmission path can be formed between the concrete of the first PC member, the first deformed steel pipe, the grout material, the second deformed steel pipe, and the concrete of the second PC member according to the principle of the lap joint. Two PC members are strongly connected. Then, by setting the diameter of the deformed steel pipe large, it effectively contributes to the shear strength.

As is clear from the above, the deformed steel pipe for a joint adopted in the present invention is different from the sleeve for butt joint used in the splice sleeve method and has a large bore diameter to form a lap joint. Therefore, it is extremely easy to insert the steel pipes into each other, and it is possible to give a margin to the alignment accuracy thereof, and the connection workability is very good. In addition, since it has unevenness and is formed with a large diameter, unlike the case where a smooth steel pipe is used, the phenomenon of slipping out can be sufficiently prevented. Furthermore, since it has irregularities and is formed with high rigidity, it can exert a sufficient restraining effect on the filled grout material and can secure high joint strength, so the length of the joint portion can be short, The amount of material required can be reduced, and the cost can be reduced.

Therefore, P provided with the above-mentioned deformed steel pipe for joint
When connecting the C pillar members, a strong connection structure based on the principle of the lap joint is obtained under extremely easy and good workability by simply inserting the deformed steel pipes and filling the grout material between them. be able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a PC column member before connection according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the same PC pillar member in a connected state.

FIG. 3 is an explanatory diagram of a stress transmission path of the above connection structure.

FIG. 4 is a configuration diagram showing a specific example of a deformed steel pipe used in the above connection structure.

[Explanation of symbols]

 1a Second Deformed Steel Pipe 1b First Deformed Steel Pipe 2 Convex Rib 5 Mortar 30 Second PC Member 32 Steel Plate 33 Peripheral Steel Plate 34 Main Bar 40 First PC Member 42 Steel Plate 43 Peripheral Steel Plate 44 Main Bar

Claims (1)

[Claims] 1. A stress which is formed in the shape of a hollow cylinder, and through the concrete and the mortar between the peripheral surface and other members arranged adjacently over almost the entire inner peripheral surface and the outer peripheral surface thereof. The first deformed steel pipe for joint, on which unevenness for transmitting is formed, is arranged perpendicularly to the joint surface of the first PC member, and one end of the first deformed steel pipe is attached to the first deformed steel pipe. It is opened in the joint surface of the PC member and is formed into a hollow cylindrical body filled with concrete or mortar, and is adjacent to these inner surfaces and almost the entire outer surface. The second deformed steel pipe for joint having a diameter smaller than that of the first deformed steel pipe, in which unevenness for transmitting stress is formed between the other arranged members through concrete or mortar, When placed vertically to the joining surface of the PC member Then, one end of the second deformed steel pipe is made to project from the joint surface of the second PC member, the first PC member and the second PC member are built in the site, and both joint surfaces are joined together. The second deformed steel pipes facing each other and protruding from the joint surface of the second PC member are inserted into the first deformed steel pipe opened to the joint surface of the first PC member, and the first deformed steel pipe is inserted. A connecting structure for a PC member, characterized in that the remaining space in the deformed steel pipe is filled with grout material such as mortar.