JP2001020377A - Connector, connecting structure of post and beam, and connecting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply connect a beam and a post, and prevent damage of a connecting part of a high-storied building due to a severe earthquake by connecting a pair of anchoring heads having a nut to each other by a steel pipe and a core bar. SOLUTION: Anchoring heads 3, 4 are connected to both ends of a stainless steel pipe 5 by welding, and connected to each other by a core bar 6. Six pre- stressed concrete steel stranded wires 8 as a tension material 7 are arranged between the fixing heads 3, 4, thereby applying pre-stress to the steel pipe 5 and the core bar 6 to form high-tension connector 1. Nuts 2a, 2b are threadedly engaged with the outer peripheries of the fixing heads 3, 4, thereby fastening a pre-stressed concrete post and a precast concrete beam to be connected to each other. Resin 18 is injected into the inside 5a of the steel pipe from a resin filling hole 20 and filled between the anchoring heads 3, 4 and a solidified body 17 and between the solidified body 17 and the steel pipe 5 to be integrated 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 joining tool for joining a column and a beam, a joining structure between a column and a beam, and a joining method therefor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 14, a prestressed concrete structure comprises a prestressed concrete column (hereinafter, referred to as a PC column) 36 and a precast concrete beam (hereinafter, referred to as a PC beam) 37, a PC steel wire 38.
To give a prestress and join. This pillar 3
6 and the PC beam 37 can be joined by the PC beam 3
After inserting the PC steel wire 38 from 7 to the PC column 36,
The PC steel wire 38 is tensioned with a jack, and the PC column 36 and the PC
The beam 37 was joined.

[0003]

However, the connection between the PC column and the PC beam has a problem that it takes time and effort since a PC steel wire must be inserted from the PC beam to the PC column at the site. . In high-rise buildings,
It is difficult to increase the span due to the strength of the column axial force, and the seismic stress is dominant over the load capacity of vertical stress, which is an advantage of the prestressed concrete structure. Therefore, the joint between the prestressed PC column and the PC beam was liable to break down when a large earthquake occurred because the prestressing force and the bending stress during the earthquake were concentrated.

The present invention has been made in view of the above-mentioned problems, and has as its object to completely separate a shear stress and a bending stress acting on an end of a beam without applying prestress. Even though it is easy to join PC beams and columns (prestressed concrete columns: PC columns, RC columns, steel tube concrete columns) with a joint that resists only the tensile force generated by bending stress, and also join high-rise buildings due to a large earthquake The purpose is to prevent damage to the parts.

[0005]

According to another aspect of the present invention, a pair of fixing heads having nuts are joined by a steel pipe and a core rod. .

According to the first aspect of the present invention, it is possible to provide a connector having a composite structure capable of easily connecting a column and a beam.

According to a second aspect of the present invention, a pair of fixing heads having nuts are joined by a steel pipe and a core rod, and the core rod and the steel pipe are prestressed by a tension member between the fixing heads. Features.

According to the second aspect of the present invention, the prestress is applied to the core rod and the steel pipe, so that the tension member can be integrated to form a high-tensile joint, and the column and the beam can be connected to each other. A connector that can be easily joined can be provided.

According to a third aspect of the present invention, a fixing head having a nut is provided at both ends of a steel pipe, and the steel pipe is prestressed by a tension member between the fixing heads.

According to the third aspect of the present invention, by applying the prestress to the steel pipe, it is possible to effectively form a high-tensile joint from the compression region using the compressed deformation, It is possible to provide a connector that can easily join a column and a beam.

The invention according to a fourth aspect is characterized in that, in the first to third aspects, a solidified body is fitted into the steel pipe.

According to the fourth aspect of the invention, the buckling performance, fire resistance, fixing performance, and rust prevention performance of the connector can be improved.

According to a fifth aspect of the present invention, in the fourth aspect, a resin is press-fitted into the steel pipe.

According to the fifth aspect of the present invention, the resin is filled in the gap in the steel pipe, and the steel pipe, the core rod, the tension member,
The solidified body and the fixing head are integrated.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the outer periphery of the core bar is covered with a coating.

According to the invention of claim 6, corrosion of the tendon and the core rod in the steel pipe can be prevented.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the core rod is screwed and joined to the fixing head.

According to the seventh aspect of the present invention, the core rod can be easily attached to the fixing head, and the length of the connector can be arbitrarily adjusted.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the tension member is a PC steel stranded wire, a PC steel wire, a PC steel rod, or a carbon steel wire.

According to the invention of claim 8, prestress can be easily applied to the steel pipe and the core rod, and
The fixing of the ends of the PC steel strand, the PC steel wire, the PC steel rod, and the carbon steel wire can be easily performed.

According to a ninth aspect of the present invention, in the second to eighth aspects, at least one of the tension members is joined to the fixing head by a wedge or a pressure grip.

According to the ninth aspect of the present invention, the tension member can be easily fixed to the fixing head.

According to a tenth aspect of the present invention, in the eighth aspect, one of the steel bars is screwed into the fixing head and joined.

According to the tenth aspect, the steel rod can be easily attached to the fixing head, and the length between the fixing heads can be arbitrarily changed.

According to an eleventh aspect of the present invention, the pillar and the beam are joined by a joining tool inserted from the joining end of the beam to the pillar, and the joining tool is a pair of a fixing head having a nut and a steel pipe. It is characterized in that the core rod and the steel pipe are prestressed with a tension member between the fixing heads.

According to the eleventh aspect of the present invention, since the column and the beam are hinged and the rotational deformation capability of these joints can be enhanced, it is possible to prevent the joints from being broken during a large earthquake. .

According to a twelfth aspect of the present invention, a beam is erected between columns erected at appropriate intervals, and a connector is inserted from the joint end of the beam to the column. A nut is screwed into the part and the end on the beam side to join the column and the beam.

According to the twelfth aspect of the present invention, the column and the beam can be easily joined in the same manner as the bolt connection, so that the tensioning operation of the tendon such as the PC steel wire at the site can be omitted.

[0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a joining tool, a joining structure and a joining method according to an embodiment of the present invention. FIG. 1A is a cross-sectional view of the connector according to the first embodiment, FIG. 1B is a cross-sectional view taken along line AA of FIG.
(3) is a sectional view taken along line BB of (1). In FIG. 1, reference numeral 1 denotes a connector, which includes fixing heads 3 and 4 having nuts 2a and 2b, a steel pipe 5, a core rod 6, and a tension member 7.

The fixing heads 3 and 4 are made of a stainless steel tube 5.
Are welded and joined to each other by core rods 6. Also, between the fixing heads 3 and 4, six PC strands 8 as tension members 7 are wired, thereby applying a pre-stress to the steel pipe 5 and the core rod 6 to thereby provide a high-tensile joining tool 1. And Nuts 2a and 2b are screwed onto the outer circumferences of the fixing heads 3 and 4, whereby the PC column and the PC beam can be tightened and joined.

The PC stranded wire 8 is formed by spirally winding a plurality of side wires 10 around an outer periphery of a core wire 9 at the center, and the entire outer periphery of the core wire 9 and the side wire 10 is made of a synthetic resin coating 11. , One end of which is fixed to one fixing head 3 by a pressure grip 15, and the other end of which is fixed to the other fixing head 4 by a wedge 16.

A solidified body 17 made of high-strength mortar is inserted into the steel pipe 5a, and is integrally joined with the fixing heads 3, 4 and the steel pipe 5 by a resin 18, and each hole 1 of the solidified body 17 is formed.
The PC steel strand 8 and the core rod 6 are inserted into 2 and 19, respectively. The resin 18 is provided in the resin column insertion holes 20 of the fixing heads 3 and 4.
And between the fixing heads 3 and 4 and the solidified body 17, between the solidified body 17 and the steel pipe 5, between the PC steel strand 8 and the hole 12, and between the core rod 6 and the hole 19. The gaps and other gaps are filled to integrate them. Note that the solidified body 17 can be formed of ceramic instead of the high-strength mortar.

Hereinafter, a method for assembling and forming the connector 1 will be described with reference to FIG. First, each member processed from each factory, that is, fixing heads 3 and 4 having nuts 2a and 2b, a stainless steel pipe 5, a core rod 6, and a coating 1
The PC steel strand 8 coated with 1 and the solidified body 17 made of high-strength mortar are carried into the site.

Next, one end of the core rod 6 is screwed into the fixing head 3 and one end of the stainless steel pipe 5 is welded. Next, the solidified body 17 is inserted into the steel pipe 5a by the hole 1
9 while inserting the core rod 6 into the core rod 6.
The other fixing head 4 is screwed into the other end of the steel pipe 5, and the other end of the steel pipe 5 is welded to the fixing head 4 by welding.

Next, a PC steel stranded wire 8 having a crimping grip 15 at one end is connected to each of the holes 12 and 19 of one fixing head 3.
Then, the PC steel strand 8 is tensioned by a predetermined force to apply prestress to the core rod 6 and the steel pipe 5 and is fixed by the wedge 16.

After tensioning the PC stranded wire 8 in this manner, when the resin 18 is pressed into the steel pipe 5a from the resin injection holes 20 of the fixing heads 3 and 4 at both ends, the resin 18 is pressed.
4 and the solidified body 17, between the solidified body 17 and the steel pipe 5, P
Between the C steel strand 8 and the hole 12, between the core rod 6 and the hole 19,
And other gaps to integrate them.
In this way, as shown in FIG. 1, the connector 1 in which the steel pipe 5 and the core rod 6 are given a predetermined prestress is assembled and formed.

FIG. 5 shows the tensile yield strength of the connector 1, from which it was confirmed that the connector 1 had high tensile strength.

FIG. 6 shows a connector 21 according to the second embodiment, except that both ends of the PC steel strand 8 are fixed to the fixing heads 3 and 4 by wedges 16. This is the same configuration as in FIG. Thus, both ends of the PC steel stranded wire 8 are wedge 1
Fixing at 6 makes it easy to fix the edges,
Since the wedges 16 face each other, loosening can be prevented.

FIG. 7 shows a connector 22 according to the third embodiment. The PC steel strand 8 of the connector 1 of FIG.
It has the same configuration as the connector 1 of FIG. With such a configuration, the core bar 6 and the PC steel bar 23
Thereby, high tension and toughness are increased, and flexural stress can be flexibly handled. (2) PC steel bar 23
Is fixed to the fixing heads 3 and 4 with screws instead of fixing the one end of the wedge 16, and there is an effect that the fixing can be easily performed.

FIG. 8 shows a connector 24 according to a fourth embodiment, in which the core rod 6 is thinned and the PC steel stranded wire 8 is
It has the same configuration as the connector 1 of FIG. With such a configuration, it is possible to achieve the same effect as the connector 1 of FIG. The PC steel bar 23 has one end fixed to the fixing head 4 by the wedge 16, but may be joined by screws (not shown) instead. Further, (3) uses the tendon 7 with the PC steel bar 23.
However, in this case, the same effect as described above can be obtained.

FIG. 9 shows a connector 25 according to a fifth embodiment, in which the core rod 6 is omitted, the PC stranded wire 8 is replaced by three large-diameter steel rods 26, and one end of which is fixed to the fixing head 4 It has the same configuration as the connector 1 of FIG. With such a configuration, the same effect as that of the connector 1 of FIG. 1 can be obtained.

FIG. 10 shows a connector 27 according to the sixth embodiment.
And the core rod 6 is omitted, and the PC steel stranded wire 8 is connected to the PC steel rod 23.
1 except that one end thereof is screwed to the fixing head 4. With such a configuration, high tensile strength and toughness are further increased, and it is possible to cope with shear stress of ten parts.

FIG. 11 shows a connector 39 according to the seventh embodiment.
1 except that the PC steel strand 8 is replaced with a PC steel rod 23 and both ends of the strand are joined to the fixing head 4 with screws. Providing the screws 14 at both ends of the PC steel bar 23 has the effect that the connector 1 can be easily assembled. The structure in which the tension member 7 is the PC steel bar 23 and the screws 14 are provided at both ends thereof is described in FIGS.
0 can be applied to the connection tools 21, 22, 24, 25, and 27.

Next, a joint structure between a column and a beam using the above-described joining tool of FIG. 1 will be described with reference to FIGS. FIG. 12 shows a skeleton 30 of a prestressed structure assembled with PC columns 28 and PC beams 29, and the PC columns 28 and PC beams 29 are joined by the above-mentioned joint 1.

As shown in FIG. 13, a joint end 32 of the PC beam 29 is placed on a jaw 31 projecting from a place where the PC beam 29 is erected on the PC column 28. 28. This PC beam 29 is pre-stressed in advance by a primary cable 33, and one PC
Two joining tools 1 are inserted in two vertical stages from the joint groove 34a of the beam 29a to the joint groove 34b of the PC beam 29b opposed across the PC column 28, and nuts 2a, 2b are provided at both ends. Is tightened. A joint mortar 29c is filled between the ends of the PC beams 29a and 29b and the PC beam.

The shear force generated at the joint end 32 of the PC beam 29 is resisted by the jaw 31 of the PC column 28, and the upward shear resistance is regulated by the stopper 35 provided on the PC column 28. The stopper 35 is formed by binding a plurality of PC steel strands, and the end protruding from the side surface of the PC column 28 is in contact with the upper surface of the PC beam 29.

As described above, the joining end 32 of the PC beam 29 is
It is joined to the C column 28, and its upper and lower parts are the jaw 31 and the stopper 3
5, it is hinged to the PC column 28 and can rotate up, down, left, and right, but this rotation is suppressed by the connector 1.

Therefore, even if a large earthquake occurs and stress concentrates on this joint, the hinged PC beam 29 rotates to prevent the joint from breaking, but this rotation is kept within a predetermined range by the joint 1. Controlled.

Next, a method of joining the PC beam and the column will be described with reference to FIG. The joint 1 is, as described above,
Assembled and formed in the factory in advance shall be transported to the site.

Then, as shown in FIG.
A PC beam 29 is installed between them, and PC
When the beam 29 is attached in a state of intersecting with the PC column 28, the connector 1 from which the nuts 2a and 2b at both ends are removed is opposed to the joint column 4 from the joint groove 4a of the one PC beam 29a. It is inserted through the joint groove 34b of the PC beam 29b.
It is to be inserted from 9 to the PC column 28.

Then, nuts 2 are attached to both ends of the joint 1 inserted into the joint of each PC column 28 and PC beam 29 in this manner.
These PC columns 28 and PC beams 29 are joined by screwing and tightening a and 2b. By repeating such operations sequentially, the frame 3 as shown in FIG.
0 can be easily assembled and constructed.

That is, since the PC column 28 and the PC beam 29 can be easily joined by the above-mentioned joining tool 1 in the same manner as the bolt joining, the conventional PC using the jack is used.
Tension work of the steel strand 8 can be omitted, and the construction period can be significantly reduced. Therefore, since such complicated work at the site is eliminated, the assembly and construction of a particularly high-rise building can be easily performed.

[0053]

According to the present invention, a prestress is applied to a core rod and a steel pipe so that a high-strength joint can be formed, and a joint that can easily join a PC column and a PC beam can be provided. it can.

By applying a prestress to the core rod and the steel pipe with a tendon material, it is possible to provide a connector having a uniform yield elongation.

By applying a prestress to the core rod and the steel pipe with a tendon material, it is possible to apply a compressive deformation to them in advance.

By applying a prestress to the steel pipe, it is possible to form a high-strength connector,
It is possible to provide a connector that can easily join the column and the PC beam.

Buckling performance, fire resistance, fixing performance,
Rust prevention performance can be improved.

The resin is filled in the gap in the steel pipe, and the steel pipe and the solidified body or the solidified body and the fixing head are integrated.

[0059] Corrosion of the core rod can be prevented.

The core rod can be easily attached to the fixing head, and the length of the connector can be arbitrarily adjusted.

Prestress can be easily applied to the steel pipe and the core rod, and the end of the steel wire or the steel rod can be easily fixed.

The tension material can be easily fixed to the fixing head.

The steel bar can be easily attached to the fixing heads, and the length between the fixing heads can be arbitrarily changed.

Since the column and the beam are hinged and the rotational deformation capability of these joints can be increased, the joints can be prevented from being damaged during a large earthquake.

Since the column and the beam can be easily joined in the same manner as the bolt connection, the work of tensioning a tension member such as a PC steel wire at the site can be omitted, and the construction period can be significantly shortened. become able to. In addition, since complicated work on site is eliminated, assembly of a particularly high-rise building can be easily performed.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a connector according to a first embodiment,
(2) is a sectional view taken along the line AA of (1), and (3) is a sectional view of B of (1).
FIG. 4 is a cross-sectional view taken along line B.

FIG. 2 is a sectional view of a PC steel strand.

3 (1) is a front view of the connector of FIG. 1, and (2) and (3) are side views of (1).

FIGS. 4 (1) and (2) are sectional views showing an assembled state of the connector of FIG. 1;

FIG. 5 is a line graph showing the tensile yield strength of the joint of FIG. 1;

FIG. 6A is a cross-sectional view of the connector according to the second embodiment,
(2) is a sectional view taken along line CC of (1).

FIG. 7A is a cross-sectional view of the connector according to the third embodiment,
(2) is the same sectional view.

FIG. 8 (1) is a sectional view of a connector according to a fourth embodiment,
(2) is a sectional view taken along line DD of (1), and (3) is a sectional view of the same.

FIG. 9 (1) is a sectional view of a connector according to a fifth embodiment,
(2) is a sectional view taken along line EE of (1).

FIG. 10A is a cross-sectional view of the connector according to the sixth embodiment, and FIG. 10B is a cross-sectional view taken along line FF of FIG.

FIG. 11 (1) is a sectional view of a connector according to a seventh embodiment.

FIG. 12 is a front view of a skeleton having a structure using a connector.

FIG. 13 is a perspective view of a joint between a column and a beam, and FIG.
FIG.

FIG. 14 is a front view of a frame having a conventional structure.

[Explanation of symbols]

 1, 21, 22, 24, 25, 27, 39 Connector 2a, 2b Nut 3, 4 Fixing head 5 Steel pipe 6 Core rod 7 Tension member 8 PC stranded wire 9 Core wire 10 Side wire 11 Coating 12 Hole 13 Screw 15 Crimping grip Reference Signs List 16 wedge 17 solidified body 18 resin 19 hole 20 resin injection hole 23 PC steel rod 26 steel rod 28, 36 PC column 29, 37 PC beam 30 skeleton 31 jaw 32 joint end 33 primary cable 34a, 34b joint groove 35 Stopper 38 PC steel wire

Claims (12)

[Claims] 1. A connector comprising a pair of fixing heads having nuts joined by a steel pipe and a core rod. 2. A pair of fixing heads having a nut are joined by a steel pipe and a core rod, and prestress is applied to the core rod and the steel pipe by a tension member provided between the fixing heads. Joiner. 3. A connector according to claim 1, wherein fixing heads provided with nuts are provided at both ends of the steel pipe, and said steel pipe is prestressed by a tension member provided between said fixing heads. 4. The connector according to claim 1, wherein a solidified body is fitted into the steel pipe. 5. The connector according to claim 4, wherein a resin is press-fitted into the steel pipe. 6. The connector according to claim 1, wherein the outer periphery of the core rod is covered with a coating. 7. The joining tool according to claim 1, wherein the core rod is screwed into the fixing head and joined. 8. The tension member is made of PC steel strand, PC steel wire, PC
The connector according to any one of claims 1 to 7, wherein the connector is a steel rod or a carbon steel wire. 9. The connector according to claim 2, wherein at least one of the tension members is joined to the pin hend by a wedge or a crimping grip. 10. The connector according to claim 8, wherein one of the steel bars is screwed into the fixing head and joined. 11. A pillar and a beam are joined by a joining tool inserted from the joining end of the beam to the pillar, and the joining tool is joined by a pair of fixing heads provided with nuts by a steel pipe and a core rod. ,
A joint structure between a column and a beam, wherein a prestress is applied to the core rod and the steel pipe with a tension member between the fixing heads. 12. A beam is erected between pillars erected at appropriate intervals, a connector is inserted from a joint end of the beam to the pillar, and a column-side end and a beam-side end of the connector are provided. A method of joining a column and a beam, comprising joining a column and a beam by screwing a nut to a portion.