JP3958453B2 - Precast concrete joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure of precast concrete members used in a construction method in which precast concrete members (for example, precast concrete panels) divided into several parts in the vertical and horizontal directions and two parts in the thickness direction are joined and integrated on site. For example, it is suitable for use in a precast concrete seismic wall as a seismic reinforcing member of a building.
[0002]
[Prior art]
As a seismic reinforcing member of a building, a precast concrete seismic wall joined with a precast concrete panel may be adopted. Conventionally, this type of precast concrete panel has been joined by the structure shown in FIGS. FIG. 5 is a horizontal sectional view showing a conventional precast concrete member joining structure, and FIG. 6 is an AA arrow view of FIG. In this conventional structure, a pair of precast concrete panels 1 and 2 divided into two in the thickness direction sandwich the substantially half of the connecting steel plate 3 between the edge portions 1a and 1a, and penetrate the edge plate 1a and the connecting steel plate 3 with a high height. The force bolt 5 is fastened to the nut 6, and the edges 1 a and 1 a are connected to the steel plate 3. Similarly, the other approximately half of the connecting steel plate 3 is sandwiched between the edges 1a and 1a of the other precast concrete panels 1 and 1, and the precast concrete panels 1 adjacent in the plane direction are continuously joined, The precast concrete seismic wall 7 was obtained as a seismic reinforcement member.
[0003]
By the way, in such a conventional structure, in order to clamp the precast concrete panel 1 to the connecting steel plate 3, the embedded metal 9 is attached to the edge portion 1a, and the connecting steel plate 3 is sandwiched between the embedded metal 9 and the high strength bolt. 5 was sandwiched. The embedded metal 9 is attached to the edge 1 a by fixing a plurality of studs 11 by welding and arranging the studs 11 in the thickness direction of the precast concrete panel 1.
[0004]
[Problems to be solved by the invention]
However, in the joint structure of the precast concrete member to which the above-described embedded metal object to which the stud is welded and fixed is attached, a plurality of studs are welded and fixed to the embedded metal object 9, which necessitates a complicated welding operation. Became time-consuming.
Further, when the stud is welded and fixed, the embedded metal is thermally deformed, and particularly, if the joint surface, the bolt hole or the like is deformed, the construction accuracy may be lowered.
Further, in the conventional joint structure, since a hole 13 (see FIG. 5) for inserting a high-strength bolt is provided in the precast concrete panel, it is necessary to embed a separate sleeve material (not shown) precisely in accordance with the bolt hole of the embedded metal. There is a drawback that the manufacturing process of the precast concrete panel is complicated.
The present invention has been made in view of the above situation, and can embed an embedded metal without welding a stud, obtain high construction accuracy, and embed a sleeve material for forming a high-strength bolt insertion hole. Another object of the present invention is to provide a joint structure for precast concrete members that is unnecessary.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the precast concrete member joining structure according to the first aspect of the present invention includes a pair of precast concrete member bisected in the thickness direction and sandwiching a steel plate between the edges of the pair of precast concrete members. In a precast concrete member joining structure in which high-strength bolts penetrating through a connecting steel plate are tightened to join precast concrete members adjacent in the plane direction, a bottomed cylindrical embedded cap is provided at the edge of the precast concrete member. The outer peripheral surface with respect to the bottom of the tube portion is embedded so that it adheres to the concrete, and the connecting steel plate sandwiched between the bottom portions of the embedded cap is fastened with a high-strength bolt together with the bottom portion, and the edges are sandwiched between the connecting steel plates. It is characterized by wearing.
[0006]
This joint structure for precast concrete members is necessary for the conventional embedded metal fittings in which the precast concrete member is attached to the outer peripheral surface of the embedded cap, the embedded cap is supported in the precast concrete member, and the steel plate is placed on the joint surface. The stud which was was no longer needed. In addition, the stud is not necessary, welding associated therewith is eliminated, and the joint is not deformed by welding. Furthermore, a bottomed cylindrical embedding cap is embedded, and after embedding, the interior of the embedding cap remains as a space for bolt insertion, and a sleeve for forming a hole for bolt insertion needs to be embedded separately. Disappear.
[0007]
The joint structure of the precast concrete member according to claim 2 is characterized in that an opening peripheral edge of the embedded cap is embedded in the precast concrete member.
[0008]
In this precast concrete member joining structure, the opening periphery of the embedded cap is embedded in the precast concrete member, and the opening periphery of the embedded cap is not exposed on the surface of the precast concrete member. Heat is no longer conducted through the embedded cap to the other surface.
[0009]
The joint structure of the precast concrete member according to claim 3 is characterized in that a protruding portion that protrudes into the precast concrete member is provided on the outer peripheral surface of the embedded cap.
[0010]
In this precast concrete member joint structure, the load applied in the axial direction of the embedded cap is supported by the protruding portion protruding into the precast concrete member from the outer peripheral surface of the embedded cap, and the axis of the embedded cap relative to the precast concrete member is supported. The supporting strength in the direction, that is, the pull-out strength is increased.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a precast concrete member joining structure according to the invention will be described in detail with reference to the drawings.
1 is a horizontal cross-sectional view showing a precast concrete member joining structure according to the present invention, FIG. 2 is an enlarged cross-sectional view of an edge of a precast concrete member in which an embedded cap is embedded, and FIG. FIG. 4 is a cross-sectional view of a precast concrete member edge for explaining a modification of the embedded cap used in the joining structure of the present invention.
[0012]
As shown in FIG. 1, a bottomed cylindrical embedded cap 23 is embedded in an edge portion 21 a of a precast concrete member (precast concrete panel) 21. As shown in FIG. 2, the bottom 23a of the embedded cap 23 has a bolt hole 23c centered on the axis 23b. The embedded cap 23 is disposed so that the direction of the axis 23b is the thickness direction of the precast concrete panel 21, and is embedded in the edge portion 21a. Further, the outer surface 23d of the bottom 23a is exposed on one surface (surface to be joined) of the precast concrete panel 21. The embedded cap 23 used in this embodiment has a height substantially equal to the thickness of the precast concrete panel 21.
[0013]
When the precast concrete panel 21 is molded, the embedded cap 23 is disposed at a predetermined position by a positioning means or the like provided on a molding die (not shown), and concrete is poured into the molding die, so that the edge 21a It is buried in a predetermined position. Therefore, the interior of the embedded cap 23 remains as a hollow portion not filled with pouring concrete. This hollow portion is used as an insertion hole 25 for a high-strength bolt described later. In the embedded cap 23, the outer peripheral surface 23e of the cylindrical portion adheres to the poured concrete. As a result, the load applied in the direction of the axis 23b of the embedded cap 23 is supported.
[0014]
The edge portion 21a of the precast concrete panel 21 where the bottom portion 23a of the embedded cap 23 is exposed is formed to be slightly thinner than the other portions. This difference in thickness is for sandwiching a connecting steel plate to be described later.
[0015]
In this way, the precast concrete panel 21 in which the embedded cap 23 is embedded sandwiches one end side of the connecting steel plate 27 with the bottom 23 a of the embedded cap 23. The connecting steel plate 27 has a bolt hole 27 a into which the high-strength bolt 29 is inserted. Next, the high-strength bolts 29 are inserted into the bolt holes 23c of the bottom 23a and the bolt holes 27a of the connecting steel plate 27, and these are fastened with the high-strength bolts 29 and the nuts 30 and friction-joined, thereby precast concrete panel 21. The edge portions 21 a are connected to each other and sandwiched between the steel plates 27.
[0016]
Similarly, the other end side of the connecting steel plate 27 is sandwiched between the edge portions 21a of the other precast concrete panels 21, and the precast concrete panels 21 adjacent to each other in the plane direction are continuously joined to each other as a seismic reinforcement member for the building. A precast concrete earthquake-resistant wall 31 is obtained.
[0017]
The edge portion 21 a of the precast concrete panel 21 is fastened by the high-strength bolt 29 with the bottom portions 23 a of the embedded cap 23 sandwiching the steel plate 27 and is not damaged by the fastening force of the high-strength bolt 29.
[0018]
In the precast concrete seismic wall 31, after joining the precast concrete panels 21, gaps between adjacent panels and the insertion holes 25 of the embedded cap 23 are filled with mortar or the like as necessary.
[0019]
Thus, according to the joint structure of the precast concrete member described above, since the bottomed cylindrical embedded cap 23 is embedded in the edge portion 21a, the stud required for the conventional embedded metal fitting is made unnecessary. Can do. As a result, the manufacturing process of the embedded metal can be simplified. Further, since welding is not required, the joint portion is not deformed due to welding. Further, since the hollow portion of the embedded cap 23 remains as the insertion hole 25 for the high-strength bolt 29, it is not necessary to separately embed a sleeve for forming the bolt insertion hole.
[0020]
In the joint structure of the precast concrete member according to the present invention, when fire resistance is required, as shown in FIG. 4A, an embedded cap having a height dimension smaller than the thickness dimension of the precast concrete panel 21 41 is buried. Thereby, the opening periphery 41a of the embedding cap 41 can be embedded in the precast concrete panel 21.
If such an embedded cap 41 is used, the opening peripheral edge 41a of the embedded cap 41 is not exposed on the surface of the precast concrete panel 21, and the embedded cap 41 is moved from one surface of the precast concrete panel 21 to the other surface. Heat is no longer conducted through.
[0021]
Further, as shown in FIG. 4B, the outer peripheral surface 51 a of the embedded cap 51 may be provided with a protruding portion 51 b that protrudes into the precast concrete panel 21.
When such an embedded cap 51 is used, a load applied in the axial direction of the embedded cap 51 is supported by the protruding portion 51b, and the pull-out strength of the embedded cap 51 with respect to the precast concrete panel 21 can be increased.
[0022]
【The invention's effect】
As described above in detail, the precast concrete member joining structure according to claim 1 of the present invention embeds a bottomed cylindrical embedded cap that does not require a stud, instead of an embedded metal that welds and fixes the stud. Therefore, the welding operation can be eliminated, and the manufacturing process of the embedded metal can be simplified. Moreover, since welding is not performed, a highly accurate embedded metal can be obtained and construction accuracy can be improved. Furthermore, since the embedded metal becomes a bottomed cylindrical embedded cap, a bolt insertion hole can be secured in the precast concrete member without separately embedding a sleeve, and the manufacturing process of the precast concrete member can be simplified.
[0023]
In the joining structure of the precast concrete member according to the second aspect, since the opening peripheral edge of the embedded cap is embedded in the precast concrete member, heat is transferred from one surface of the precast concrete member to the other surface through the embedded cap. Is not transmitted, and heat insulation and fire resistance can be improved.
[0024]
In the joint structure of the precast concrete member according to the third aspect of the present invention, since the protruding portion that protrudes into the precast concrete member is provided on the outer peripheral surface of the embedded cap, the load applied in the axial direction of the embedded cap by tightening the high strength bolt is applied. , And can be supported by the protruding portion, and the pull-out strength in the axial direction of the embedded cap can be increased.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view showing a joint structure of precast concrete members according to the present invention.
FIG. 2 is an enlarged cross-sectional view of an edge of a precast concrete member in which an embedded cap is embedded.
FIG. 3 is a view taken along arrow BB in FIG. 1;
FIG. 4 is a cross-sectional view of the edge portion of a precast concrete member for explaining a modified example of the embedded cap used in the joint structure of the present invention.
FIG. 5 is a horizontal sectional view showing a joint structure of a conventional precast concrete member.
6 is an AA arrow view of FIG. 5;
[Explanation of symbols]
21 ... Precast concrete panel (precast concrete member), 21a ... Edge, 23, 41, 51 ... Embedded cap, 23a ... Bottom, 27 ... Connecting steel plate, 29 ... High strength bolt, 41a ... Opening edge, 51a ... Outer peripheral surface , 51b ... protrusion

Claims (3)

Between the edges of a pair of precast concrete members divided in two in the thickness direction, the connecting steel plates are sandwiched, and the high-strength bolts that penetrate the edges and the connecting steel plates are tightened to join adjacent precast concrete members in the plane direction. In the joint structure of precast concrete members
At the edge of the precast concrete member, a bottomed cylindrical embedded cap is embedded so that the outer peripheral surface with respect to the bottom of the cylindrical portion adheres to the concrete, and the connecting steel plate sandwiched between the bottom portions of the embedded cap is A joint structure for precast concrete members, wherein the edges are clamped together with a bottom with a high-strength bolt and the edges are sandwiched between the connecting steel plates.   The joint structure of a precast concrete member according to claim 1, wherein the opening periphery of the embedded cap is embedded in the precast concrete member.   The joint structure for precast concrete members according to claim 1, wherein a projecting portion projecting into the precast concrete member is provided on an outer peripheral surface of the embedded cap.

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