JPH1046677A - Joint hardware of precast concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To standardize a joint hardware, make it possible to simplify control and to reduce a cost. SOLUTION: A joint hardware 30 is formed by bending both longitudinal sides of a rectangular steel plate, and it is constituted of a flat joint section 31 and both side bent sections 32 and 33 bent at an obtuse angle to the joint section 31. In the case a precast concrete member is molded, the bent sections 32 and 33 are buried thereinto, and the joint section 31 is mounted by exposing an alignment face 31A to the outside. Cut sections 40A, 40B and 41A and 41B opposed to each other are recessed in the shape of a wedge at specific distances from both ends of each of edge sections 32A, 32B, 33A and 33B and are formed in the up and down edges 32A, 32B, 33A and 33B of the bend sections 32 and 33. The joint sections 31 weld a welding hardware to the alignment face 31A and are joined with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for joining a precast concrete member constituting a concrete structure skeleton of a building or the like.

[0002]

2. Description of the Related Art In a building constructed by assembling precast concrete members, when precast concrete members (hereinafter, referred to as PC members) are joined to each other, a metal fitting exposed to each PC member is welded. They are welded to each other via metal fittings. Conventionally, as a metal fitting for joining a PC member, a metal fitting for bonding as shown in FIGS. 18A to 18C or FIGS. 19A to 19C is known.
The metal fittings 2, 5, and 8 shown in (a) to (c) of FIG. 18 respectively have bonding plates 3, 6, and 9 each having a bonding surface to be bonded to each other via a metal fitting for welding on the surface side. ,
It is composed of reinforcing bars 4, 7, and 10 welded to the back surfaces of these joining plates 3, 6, and 9. Reinforcing bars 4, 7, 10 are P
It is embedded in the C member to prevent the concrete from falling off. Various types and shapes of reinforcing bars 4, 7, and 10 constituting the retaining portion have been proposed depending on the dimensions of the PC member or the required strength. For example, in (a) of FIG. 18, the center of the reinforcing bar 4 cut to a predetermined dimension is on the back surface of the joining plate 3, and in (b) of FIG. 6, in FIG. 18C, the reinforcing bars 10,
10 are welded to the back surface of the joining plate 9, respectively. FIG. 19A shows an iron bar 21.
In FIG. 19 (b), the retaining portion 24 provided on the burying side of the iron bar 23 has a conical shape, and in FIG. 19
(C) proposes that the end of the reinforcing bar 25 buried in the PC member is bent, and a reinforcing bar piece 27 is welded to the bent portion 26 to form an inverted T-shape. As for these metal fittings for connection, the metal fittings for joining are arranged in advance in the mold when molding the PC member, and after the concrete is poured and hardened, (a) in FIG.
Alternatively, as shown in (b), the joining surfaces of these joining hardware are exposed to the outside at the time of demolding, and at the time of assembling the PC members, the welding hardware 11 is welded to these exposed surfaces to connect the respective PC members. Each piece of hardware is concealed with mortar.

[0003]

In the above-mentioned conventional metal fittings for precast concrete members, since various types of metal fittings are used in accordance with the design dimensions of the PC member, a proof test is performed for each type of metal fittings. It is necessary to measure joint strength. For this reason, there is a problem that the manufacturing cost is increased as the types are increased, and the management is complicated. In addition, when the metal fittings are previously arranged on the mold frame during molding of the PC member, it is necessary to change the mounting method for each type, and there is a problem that the work is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned disadvantages, and provides a metal fitting for precast concrete members which can be easily managed and reduced in manufacturing cost by standardizing metal fittings for precast concrete members. Is what you do.

[0005]

According to the present invention, there is provided a metal fitting for joining a precast concrete member according to the present invention, which is provided with a retaining portion having resistance to escape from concrete on a side embedded in the precast concrete member and a metal fitting for welding on a surface side. In the metal fittings for the precast concrete member having surfaces joined to each other via, the metal fittings are formed from a plate body, and the notches are formed so as to be recessed in the direction intersecting the retaining direction with respect to the exit direction. It is composed.

The metal fittings for precast concrete members according to the present invention are provided with a retaining portion having resistance to escape from concrete on a side embedded in the precast concrete member, and are joined to each other via a metal fitting for welding on the surface side. Metal fittings for a precast concrete member having a flat surface, wherein the metal fittings are formed from a plate body, and the retaining portion is formed by forming a notch that is recessed in a direction intersecting the exit direction. Thereby, it is possible to increase the escape resistance, and it is possible to use it for various types of precast concrete members, and it is possible to achieve standardization.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. 1 to 3 are a perspective view, a front view and a side view, respectively, showing a metal fitting for joining a precast concrete member according to one embodiment of the present invention, and FIG.
FIG. 5 is a sectional view taken along the line V, and FIG. FIGS. 1 to 3 show a metal joint 30 according to an embodiment of the present invention.
As shown in FIG. 2, a rectangular steel plate is formed by bending both sides in the longitudinal direction, and is attached to a precast concrete member (hereinafter, referred to as a PC member). , And both side bent portions (embedded portions) 32 and 33 embedded inside the PC member. The surface of the joint 31 is a metal fitting 29 for welding (see FIG. 5).
And a joint surface 31A that is welded to the joint portion 31 of the other PC member through the joint. As shown in FIG. 4, the bent portions 32 and 33 are bent at an obtuse angle with respect to the joint portion 31 on the back surface side.

The upper and lower edges 32A, 32B, 33A, 33B of the bent portions 32, 33 are provided with cuts 40A,
40B, 41A, and 41B are formed by being recessed in a wedge shape. These notches 40A, 40B, 41A, 41B
It is cut in the direction crossing the exit direction of the joining hardware 30. That is, in the case of this embodiment,
Exit direction perpendicular D ₁ next to the joint surface 31A, notches 40A, 40B, 41A, 41B are recessed in a direction intersecting with respect to the direction D ₁ (FIG. 1, FIG. 3, (See FIG. 4). Notches 40A, 40B and 4
1A and 41B are both edges 32A of the bent portions 32 and 33,
32B and 33A, 33B respectively relative to each other,
In addition, the edge portions 32A, 32B, 33A, 33B are formed at predetermined distances L ₁ , L ₂ (see FIG. 3) from both ends. In addition, holes 42,
43 are drilled. Reinforcing bars (not shown) can be inserted into these holes 42 and 43, so that the resistance to withdrawal can be increased. Further, a hole 45 for attachment is formed substantially at the center of the joint portion 31. The hole 45 is used when attaching a metal fitting to a mold for molding the PC member 46 (see FIGS. 5 and 10).

Next, the operation of the metal fitting 30 will be described. First, the metal fitting 30 is attached to a mold (not shown) when the PC member 46 is formed, and is integrally formed with the PC member. At the time of molding, as shown in FIG.
3 is embedded in the concrete, and the joint surface 31A is exposed to the outside (see FIG. 10). And the PC member 46
When joining each other, the metal fittings 29 for welding are welded and joined to the respective joint surfaces 31A.
The exposed portion 9 is covered with a mortar 47. In FIG. 5, the metal joint 30 according to the above embodiment and the metal joint 130 according to another embodiment described later are described.
3 shows a bonding state. The bonding metal piece 30 according to the above embodiment has the bent portion 3 embedded in the PC member 46.
Since cut portions 40A, 40B, 41A, 41B are formed in 2, 33, these cut portions 40A, 40B, 41 are formed.
A and 41B prevent the joining hardware 30 from coming off. Moreover, the notches 40A, 40B, 41A, 41B
Since being formed so as to concave in a direction intersecting the direction D ₁ exits, escape resistance is increased. For this reason, the metal fittings 30 of a certain size can be used for surface mounting as metal fittings for various types of PC members, and the metal fittings can be standardized.

Next, a metal fitting 130 according to another embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 6, the metal fitting 130 according to the present embodiment is formed by bending a rectangular plate 131, and is formed by bending the flat portion 133 and the buried side end 134 to one side. It is composed of a curved part 132. The joining hardware 130 is shown in FIG.
As shown in FIG. 7, a predetermined portion E _{1 of the} bent portion 132 and the flat portion 133 which is continuous with the bent portion 132 is formed.
But are adapted to be embedded in the PC member, the other surface portion E ₂ of the flat portion 133 is adapted to be exposed to the surface of the PC member. Surface of the other portion E ₂ has a joint surface 131A of welding fittings are welded.

[0011] Then, both edges of the portions E ₁ of the flat portion 133 135A, the 135B, as shown in FIGS. 6 and 7, notches 140A, 140B are formed by recessed in a wedge shape. These notches 140A, 140B are cut in a direction intersecting the direction D ₂ escape of bonding hardware 130. That is, in the case of this embodiment,
The exit direction D ₂ becomes the longitudinal direction of the bonding hardware 130, notches 140A, 140B are recessed in a direction intersecting with respect to the direction D _2. Notch 140A,
140B is formed opposite to both edges 135A and 135B, respectively, and is formed substantially at the center of each edge 135A and 135B. Further, at a portion E ₁ of the embedded side, reinforcing bars can be inserted hole 142 is bored. Further, the flat portion 13
The exposed side portion E ₂ of 3, holes 145 for mounting are bored.

Next, a metal fitting 1 according to another embodiment described above.
The operation of 30 will be described. First, the joining hardware 130
Is molded integrally with the PC member 48 when the PC member 48 is molded, as shown in FIG. During molding, the bent portion 132 and the predetermined part E ₁ is embedded in concrete, joint surface 131A is exposed to the outside (see FIG. 11). When joining the PC members 46 and 48 together, the metal fittings 29 for welding are welded to the respective joint surfaces 31A and 131A and joined, and after joining, the exposed portions of the metal fittings 130 and 29 are joined by a mortar 47. I try to hide it. Bonding hardware 130, notches 140A to portions E ₁ that is embedded in the PC member 48, since 140B are formed, these notches 140A, the retaining of the joining hardware 130 by 140B made in I have. Moreover, the notch 14
0A, since 140B is formed so as to concave in a direction intersecting the direction D ₂ escape, escape resistance is increased. For this reason, the metal fittings 130 of a certain size can be used as metal fittings for various types of PC members, and the metal fittings can be standardized. Furthermore, since the metal fitting 130 is formed substantially in the shape of a plate, it is suitable for small-sized mounting, and the degree of freedom in design can be increased. Note that FIG. 5 shows a state in which the metal fitting 30 surface-mounted to the PC member 46 and the metal fitting 130 mounted to the PC member 48 at the small edge are joined together, and the joining surface 31A of the metal fitting 30 is joined. The welding metal 29 is welded to the bonding surface 131A of the other metal fitting 130, and the PC members 30 and 131 are bonded to each other, and the metal exposed portion 31 is joined.
A, 29, and 131A are covered with a mortar 47. FIG. 15 and FIG. 16 each show P
It is explanatory drawing which shows the state in which the metal fittings 130 were attached to the C member, and explanatory drawing which shows the joining state of the PC member to which the metal fittings 30, 130 of different types were attached.

FIGS. 12 and 13 show a modification of the metal joint 30 of the above embodiment.
Numeral 0 is formed by bending both sides in the longitudinal direction of a rectangular steel plate as shown in FIG. 12, and includes a joint portion 231 and both-side bent portions (embedded portions) 232 and 2 embedded in the PC member.
33. In the bent portions 232 and 233, the cut portions 240 which are recessed in a wedge shape in the same manner as the joining hardware 30 are provided.
A, 240B, 241A and 241B are formed. The bent portions 32 and 33 of the metal joint 30 are bent at an obtuse angle with respect to the back surface of the metal joint 30, whereas the metal joint 230 according to this modified example has the bent portions 232 and 233.
Are bent at right angles to the joint 231. FIG.
FIG. 4 is an explanatory view showing an example of a state in which metal fittings 230 are bonded to each other.

(A) to (c) of FIG.
Hardware 330 and 4 for joining PC members according to a modification of the present invention
17 and FIG. 17A, the joining hardware 330 shown in FIG. 17A has the entire edges of the bent portions 332 and 333 formed as cuts 334. Bonding hardware 430 shown in (b) of FIG. 17, formed so as to be substantially perpendicular angle to the direction D ₃ exits the surface 434A facing in the direction D ₃ exits out of notches 434 to increase the exit resistor ing. Also, the metal fitting 530 shown in FIG.
The cut portion 534 is formed in an arc shape to improve the shear strength of the hardware 530.

In the above embodiment, the cut portions are formed on both edges so as to be opposed to each other.
The present invention is not limited to this, and may be provided on only one of both edges as long as a desired escape resistance can be secured. In addition, it goes without saying that the thickness of the metal joint may be increased in order to increase the escape resistance.

[0016]

As described above, according to the metal fittings for precast concrete members according to the present invention, the metal fittings are formed of plate bodies, and are recessed in the direction intersecting with the slip-out direction with respect to the slip-out direction. By forming the notch to be formed, it is possible to increase the escape resistance with a simple configuration, and since a single joining hardware can be used for various types of precast concrete members,
This has the effect of standardizing the metal fittings for precast concrete members to reduce costs and also facilitates management.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a metal fitting for joining a precast concrete member according to one embodiment of the present invention.

FIG. 2 is a front view showing the joining hardware of FIG. 1;

FIG. 3 is a side view showing the metal fitting for FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is an explanatory view showing a joining state of a precast concrete member.

FIG. 6 is a perspective view showing a metal fitting for joining a precast concrete member according to another embodiment of the present invention.

FIG. 7 is a front view showing the joining hardware of FIG. 6;

FIG. 8 is a plan view showing the joining hardware of FIG. 6;

FIG. 9 is a side view showing the joining hardware of FIG. 6;

FIG. 10 is an explanatory view showing a state in which the joining hardware of FIG. 1 is integrally molded with a precast concrete member.

FIG. 11 is an explanatory view showing a state where the joining hardware of FIG. 6 is integrally molded with a precast concrete member.

FIG. 12 is an explanatory view showing a state before bending of a metal joint according to a modification of the present invention.

FIG. 13 is a perspective view showing a joining hardware according to a modification of the present invention.

FIG. 14 is an explanatory diagram showing an example of a state in which the metal fittings of FIG. 13 are bonded to each other.

FIG. 15 is an explanatory view showing a state in which a joining hardware is attached to a precast concrete member constituting a wall surface.

FIG. 16 is an explanatory view showing a joining state of a precast concrete member to which different kinds of joining hardware are attached.

FIGS. 17A to 17C are perspective views each showing a joining hardware according to another modification of the present invention.

FIGS. 18 (a) to (c) are perspective views each showing a conventional metal fitting.

FIGS. 19A to 19C are explanatory views each showing a conventional metal fitting.

20 (a) and (b) are explanatory views showing a conventional precast concrete member to which a metal fitting is attached.

[Explanation of symbols]

32 and 33 the bent portion (retaining portion) 31A joining surface 31 joint (front side) 29 welding fittings 30 joining fittings 40A, 40B, 41A, 41B notches D ₁ exit direction

Claims (9)

[Claims] 1. A joining hardware for a precast concrete member having a retaining portion having resistance to escape from concrete on a side embedded in the precast concrete member and having a surface joined to each other via a welding hardware on a surface side. 3. The metal fitting for a precast concrete member according to claim 1, wherein the metal fitting is formed from a plate, and a cutout is formed in the retaining portion in a direction intersecting with the direction in which the metal piece comes out. 2. The metal fitting for joining a precast concrete member according to claim 1, wherein the cut portion is formed by recessing into a wedge shape. 3. The metal fitting for joining a precast concrete member according to claim 2, wherein a surface of the cut-out portion facing in the exit direction is formed to be substantially perpendicular to the exit direction. 4. The metal fitting for joining a precast concrete member according to claim 1, wherein the notches are formed on both edges of the steel so as to face each other. 5. The metal fitting for connecting a precast concrete member according to claim 1, wherein the metal fitting is formed of a substantially rectangular plate, and an embedded end is bent in one direction. . 6. The precast concrete member according to claim 1, wherein the metal joint is composed of a flat joint portion and an embedded portion in which both sides of the joint portion are bent at a predetermined angle. Hardware for joining. 7. The metal fitting for joining a precast concrete member according to claim 6, wherein the embedded portion is bent at substantially 90 degrees or an obtuse angle with respect to the joint. 8. The joining of a precast concrete member according to claim 5, wherein a hole attachable to a mold for molding the precast concrete member is formed on a surface side of the joining hardware. Hardware. 9. The metal fitting for joining a precast concrete member according to claim 5, wherein a hole through which a reinforcing bar can be inserted is formed in the embedding side.