JP2017137625A - Connection member and connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress upsizing of a connection part and an increase in cost while firmly joining a column and a beam together in the connection part.SOLUTION: A connection member 50 is provided in a connection part C for joining a column 3 of precast concrete construction and a beam 4 of steel construction. The connection member 50 comprises: a precast part 53 that is made of precast concrete; a beam joint bracket 55 that is partially embedded in the precast part 53 and to which the beam 4 is joined; and an anchorage bar 56 that is connected to upper and lower flanges 57f of the beam joint bracket 55 within the precast part 53 and extended downward from the beam joint bracket 55.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a joint member and a joint structure provided in a joint part that joins a column and a beam.

In various building structures, it is necessary to firmly join a column and a beam capable of ensuring a required strength in a joint portion that joins the column and the beam.
For example, if the beam is reinforced concrete, the beam is made of concrete that forms the column, such as by using fixing hardware for the beam reinforcement so that the tensile force acting on the reinforcing bar that constitutes the beam is reliably transmitted to the column. It is necessary to fix it firmly.

By the way, in order to increase the efficiency of construction, it is desired to avoid the use of so-called on-site concrete, in which concrete is placed at the construction site.
Patent Document 1 discloses a configuration in which a joint member made of precast concrete (PC) is used as a joint part. In this configuration, a screw rebar is fixed to a joint member made of PC, and a rebar of a beam is joined to the screw rebar via a mechanical joint. One end of the screw rebar is fixed to a fixing metal member embedded in the joint member, and the other end protrudes from the joint member. The reinforcing bar of the beam is joined to the other end of the threaded reinforcing bar protruding from the joint member via a mechanical joint. In such a configuration, the column and the beam can be joined without using the cast-in-place concrete.

JP 2009-293192 A

By the way, when the column is made of PC and the beam is made of steel, in order to firmly join the column and the beam at the joint portion of the column and the beam, the end of the beam steel frame constituting the beam is used. It is necessary to embed in the concrete that forms the joint.
However, for example, an intermediate portion in the longitudinal direction of the beam steel may bend in the vertical direction due to a vertical load acting on the beam steel or an external force such as an earthquake. Then, the end of the beam steel frame is displaced so as to warp upward or downward in the concrete of the joint. If the amount of deformation at the end of the beam steel is large, the concrete located above the beam steel may be peeled off at the joint.

Therefore, in order to suppress the displacement of the beam steel in the concrete of the joint, it is necessary to arrange a large number of reinforcing bars around the end of the beam steel. However, when a large number of reinforcing bars are arranged, the size of the joint is increased and the cost is increased. As a result, when the column is made of PC and the beam is made of steel, it is difficult to make the joint portion of PC.
The present invention has been made in view of such problems, and a joint member capable of suppressing the increase in size and cost of the joint part while firmly joining the column and the beam at the joint part. The purpose is to provide a joint structure.

The present invention employs the following means in order to solve the above problems.
A splicing member according to the present invention is a splicing member provided in a splicing portion that joins a precast concrete column and a steel beam, and a part of the precasting portion made of precast concrete and the precasting portion. And a fixing member that is connected to the beam connection bracket in the precast portion and extends downward from the beam connection bracket.

In this manner, the fixing member that extends downward from the beam joint bracket is connected to the beam joint bracket, thereby increasing the fixing force of the beam joint bracket to the precast portion. Thereby, even if a force is applied from the beam side joined to the beam joint bracket, the beam joint bracket is hardly deformed / displaced in the precast portion. For example, even when the steel frame constituting the beam is joined to the beam joint bracket and the central part of the steel frame is deformed so as to bend downward, the beam joint bracket is hardly displaced along with the deformation of the steel frame. Accordingly, it is difficult for a force to peel the precast part upward from the beam joint bracket to the precast part, and the column and the beam can be firmly joined. Further, in the joint member made of precast concrete, it is only necessary to connect the fixing member to the beam joint bracket. Therefore, it is not necessary to arrange a large number of reinforcing bars, and it is possible to suppress an increase in size and cost of the joint portion.
Moreover, the efficiency of the work in a construction site can be aimed at by making a joint part into a precast concrete structure.

The beam joint bracket is made of H-shaped steel having flange portions on the upper and lower sides, and the fixing member is inserted into through holes formed in the upper and lower flange portions of the beam joint bracket, and the fixing member The nut member may be fixed to the upper and lower flange portions.
According to such a configuration, the fixing member and the joint member are firmly integrated by inserting the fixing member through the through holes of the upper and lower flange portions of the beam joint bracket and fixing the fixing member with the nut member. In this manner, the fixing member can be fixed to the beam joining bracket only by inserting the fixing member into the flange portion and fixing with the nut member.
Thereby, the fixing strength with respect to the precast part of a beam joining bracket can be raised easily and reliably.

Further, the fixing member may have a protruding portion that protrudes downward from the precast portion and is joined to the lower column.
With this configuration, the beam joint bracket is also fixed to the lower column by bonding the protruding portion of the fixing member protruding downward from the precast portion to the lower column. Thereby, a beam joining bracket is fixed more firmly.

  Further, the present invention is a joint structure for joining a precast concrete column and a steel beam via a joint member, wherein the joint member includes a precast part made of precast concrete, and the precast part. And a fixing member that is connected to the beam connection bracket in the precast portion and extends downward from the beam connection bracket to a lower column. And.

By comprising in this way, the fixing power with respect to the precast part of a beam joining bracket increases. Therefore, even if a force is applied from the beam side joined to the beam joint bracket, the beam joint bracket is less likely to behave in the precast portion. As a result, it is possible to suppress an increase in size and cost of the joint while firmly joining the column and the beam.
Moreover, the efficiency of the work in a construction site can be aimed at by making a joint part into a precast concrete structure.

  Further, the fixing member has a protruding portion that protrudes downward from the precast portion, and the column below the joint member includes a joint member into which the protruding portion is inserted and joined. May be.

  With this configuration, the beam joint bracket is also fixed to the lower column by joining the protruding portion of the fixing member protruding downward from the precast portion to the lower column via the joint member. Thereby, the beam joint bracket is firmly fixed.

  According to the joint member and the joint structure according to the present invention, it is possible to suppress an increase in size and cost of the joint part while firmly joining the column and the beam at the joint part.

It is a perspective view which shows an example of the building structure constructed | assembled applying the joint member and joint structure in this embodiment. It is a figure which shows the structure of the pillar of the said building structure, and is an elevational sectional view in the position of a pillar main reinforcement. It is a figure which shows the structure which joins a column member and a beam member by a joint member in a joint part, and is an elevational sectional view in the position of the fixing reinforcement of a joint member. It is an expanded view which shows the upper end part of a pillar member, and a joint member. It is a plane sectional view of a joint member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a joint member and joint structure according to the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited only to this embodiment.

FIG. 1 is a perspective view showing an example of a building structure constructed by applying the joint member and joint structure in the present embodiment.
As shown in FIG. 1, a building structure 1 is an evacuation facility provided in a coastal area, for example, and includes a foundation part 2 constructed in the ground and a plurality of pieces provided to extend vertically upward from the foundation part 2. The column 3 and the beam 4 provided between the columns 3 adjacent to each other are provided at least.

  In the present embodiment, the building structure 1 has a rectangular shape in plan view, and the pillars 3 are arranged at the four corners of the building structure 1, respectively. Further, the beam 4 is installed between the columns 3 and 3 adjacent to each other along the outer shape of the building structure 1. In the building structure 1 having a rectangular shape in plan view, the beams 4 are provided in two layers, for example, at an intermediate portion 3c of the column 3 and an upper end portion 3t of the column 3 with an interval in the vertical direction of the column 3. .

Reinforcing braces 5 are provided inside the corners of the four beams 4 assembled in a rectangular shape in plan view at the height of the intermediate portion 3c of the column 3 and the upper end portion 3t of the column 3, respectively.
An evacuation space 10 is provided at the top of the building structure 1. The evacuation space 10 includes a flooring 6 made of, for example, a grating material, which is laid on the beams 4, 4,... 7.
On the outer periphery of the building structure 1, a stairway 9 is provided for ascending to the evacuation space 10 from the ground.

  In such a building structure 1, the pillar 3 is configured by connecting a plurality of precast concrete (PC) pillar members 30 having a certain length in the vertical direction in the vertical direction. The beam 4 is formed using a beam steel frame 40 having an H-shaped cross section. A joint member 50 is provided at the joint portion C between the PC column member 30 constituting the pillar 3 and the beam steel frame 40 constituting the beam 4.

FIG. 2 is a diagram showing the configuration of the pillar of the building structure, and is an elevational sectional view at the position of the pillar main reinforcement. FIG. 3 is a view showing a structure in which the column member and the beam member are joined to each other at the joint portion by the joint member, and is an elevational sectional view at the position of the fixing stripe of the joint member. FIG. 4 is a development view showing the upper end portion of the column member and the joint member. FIG. 5 is a plan sectional view of the joint member.
As shown in FIGS. 2 to 4, the column member 30 includes a column main bar 31, a hoop bar 32, and a precast part 33.

A plurality of column main bars 31 are embedded in the precast part 33 and extend along the vertical direction. The upper ends 31t of the columnar bars 31 protrude upward by a predetermined length from the precast part 33, and a plurality of upper end parts 31t are installed at the four corners of the precast part 33 that form a square in plan view.
The hoop lines 32 are embedded in the precast part 33, and a plurality of hoop lines 32 are provided at intervals in the vertical direction. Each hoop bar 32 is arranged so as to surround a plurality of column main bars 31.

The precast portion 33 is obtained by curing concrete in advance at a factory, and has a prismatic shape. A cylindrical mechanical joint 34 is embedded in the lower end portion of each precast portion 33. The lower end of the mechanical joint 34 is exposed at the lower end surface 33b of the precast portion 33, and the upper end portion 31t of the column main bar 31 protruding upward from another column member 30 disposed below is inserted and joined.
Grout is also injected into the joint between the upper and lower precast parts 33.

  As shown in FIGS. 3 and 4, in the column member 30 positioned below the joint member 50, a lower end portion 56 b of a fixing bar 56 of the joint member 50 described later is inserted into the upper surface of the precast portion 33. An insertion hole 33h is provided. The insertion hole 33h is provided with a mechanical joint 36 to which the lower end portion 56b of the fixing bar 56 is joined.

As shown in FIG. 2, the beam steel frame 40 is made of, for example, a so-called H-shaped steel having an H-shaped cross section. The beam steel frame 40 is integrally formed with a web 40w located in the vertical plane and flange portions 40f provided on the upper and lower sides of the web 40w and projecting horizontally from the web 40w toward both sides in the plate thickness direction of the web 40w. I have.
The length of the beam steel frame 40 is set according to the horizontal length of each side of the building structure 1. Both ends of the beam steel frame 40 are joined to a beam joint bracket 55 of the joint member 50 described later by a joint plate, bolts / nuts, welding or the like (not shown).

  As shown in FIGS. 2 to 4, the joint member 50 includes a main reinforcement insertion hole 51 (see FIGS. 2 and 4), a hoop reinforcement 52, a precast portion 53, a beam joint bracket 55, and a fixing reinforcement 56 ( 3 and FIG. 4).

As shown in FIGS. 2 and 4, the main bar insertion hole 51 is inserted through the precast part 53 in the vertical direction in order to insert the upper end part 31 t of the column main bar 31 protruding upward from the precast part 33 of the column member 30. Is formed. In a state where the joint member 50 is disposed on the precast portion 33 of the column member 30, the upper end portion 31 t of the column main reinforcement 31 penetrates the main reinforcement insertion hole 51 and protrudes above the precast portion 53.
Here, in the joint member 50T arranged at the upper end portion 3t of the column 3, a recess 53m is formed on the top surface 53t of the precast portion 53, and the upper end portion 31t of the column main reinforcement 31 penetrating the main reinforcement insertion hole 51 is the recess 53m. Protrusively inside. A fixing nut 58 is screwed to the upper end portion 31 t of the column main bar 31 and is fixed to the top surface 53 t of the precast portion 53.

The hoop lines 52 are embedded in the precast part 53, and a plurality of hoop lines 52 are provided at intervals in the vertical direction. Each hoop muscle 52 is arranged so as to surround the plurality of main muscle insertion holes 51.
The precast portion 53 is obtained by curing concrete in a factory in advance, and has a prismatic shape.

As shown in FIGS. 3 to 5, the beam joining bracket 55 is configured by integrating two steel members 57 </ b> A and 57 </ b> B in a cross shape in plan view. Each of the steel frame members 57 </ b> A and 57 </ b> B is made of an H-section steel material having the same cross-sectional shape as the beam steel frame 40. That is, each of the steel members 57A and 57B is integrally provided with a web 57w located in the vertical plane and a flange portion 57f provided above and below the web 57w and projecting horizontally from the web 57w.
In the beam joint bracket 55, an intersecting portion 55 </ b> C in which the steel member 57 </ b> A and the steel member 57 </ b> B intersect in a cross shape in plan view is embedded in the precast portion 53. In each of the steel members 57 </ b> A and 57 </ b> B, one end portions 57 s and 57 t protrude from the precast portion 53 in a direction orthogonal to the main muscle insertion hole 51.

  At the intersecting portion 55C of the beam joint bracket 55, the upper and lower flange portions 57f and 57f of the steel members 57A and 57B are respectively bolt insertion holes at a plurality of positions spaced along the length direction of the steel members 57A and 57B. 57h is formed.

The fixing muscle 56 is provided in the precast portion 53 so as to extend in the vertical direction. The fixing muscle 56 is inserted into the bolt insertion holes 57h and 57h formed in the upper and lower flange portions 57f and 57f of the steel members 57A and 57B of the beam joint bracket 55. In this embodiment, for example, four fixing muscles 56 are arranged on each of the extending portions 55E of the steel members 57A and 57B extending in the four directions from the center of the intersecting portion 55C.
An upper end portion 56 t of the fixing muscle 56 is located in the precast portion 53. Fixing nuts 59A and 59B are screwed onto the fixing muscle 56 so as to abut against the upper surface of the upper flange portion 57f of the steel members 57A and 57B and the lower surface of the lower flange portion 57f, respectively.
Further, as shown in FIGS. 3 and 4, the fixing bars 56 are arranged so that a predetermined length of the lower end part 56 b protrudes below the precast part 53. The lower end portion 56b of the fixing bar 56 is inserted into an insertion hole 33h formed in the upper surface of the precast portion 33 of the column member 30 located on the lower side of the joint member 50, and a mechanical joint 36 provided in the insertion hole 33h. To be joined.

Next, a construction method of the building structure 1 as described above will be described.
First, the pillar member 30 manufactured in advance in the factory is installed on the foundation part 2 constructed in the ground, and the pillar 3 is erected. The column members 30 positioned above and below each other are provided on the lower end surface 33b of the precast portion 33 of the upper column member 30 with the upper end portion 31t of the column main reinforcement 31 protruding upward from the precast portion 33 of the lower column member 30. Inserted into the mechanical joint 34 and joined. Thereafter, grout (not shown) is injected into the mechanical joint 34 so that the upper end portion 31t of the column main reinforcement 31 of the lower column member 30 and the lower end portion 31b of the column main reinforcement 31 of the upper column member 30 are machined. They are joined via a joint 34.

Further, the joint member 50 is installed on the column member 30 at the intermediate portion 3c and the upper end portion 3t of the column 3 on which the beam 4 is provided.
Here, the joint member 50 is manufactured in advance at the factory. When manufacturing in a factory, it is preferable that the joint member 50 is turned upside down and the lower end portion 56b of the fixing bar 56 protruding downward is directed upward. When the joint member 50 is installed on the column member 30, the joint member 50 is turned upside down so that the lower end portion 56 b of the fixing bar 56 faces downward.

  In order to install the joint member 50 on the column member 30, the upper end portion 31 t of the column main bar 31 protruding upward from the precast portion 33 of the column member 30 located on the lower side is connected to the precast portion 53 of the joint member 50. The fixing nut 58 is screwed into the main muscle insertion hole 51 provided at the lower end. As shown in FIG. 5, the column main bars 31 are inserted into the main bar insertion holes 51 at the four corners between the bone members 57 </ b> A and 57 </ b> B intersecting the cross in the beam joint bracket 55 of the joint member 50.

  Further, the lower end portion 56b of the fixing bar 56 protruding downward from the joint member 50 is inserted into an insertion hole 33h formed on the upper surface of the precast portion 33 of the column member 30 located on the lower side. The lower end portion 56b of the fixing muscle 56 is inserted into the mechanical joint 36, and then grout is injected and joined.

  As shown in FIG. 2, the joint member 50 installed in this way has a beam steel frame 40 at the ends 57 s and 57 t of the steel frame members 57 </ b> A and 57 </ b> B of the beam joint bracket 55 protruding sideways from the precast portion 53. Join the ends. Thereby, the beam 4 is constructed between the pillars 3 and 3 adjacent to each other.

In the joint structure according to the present embodiment described above, the precast concrete column 3 and the steel beam 4 are joined via the joint member 50. The joint member 50 is connected to the beam joint bracket 55 in the precast part 53, the beam joint bracket 55 in which a part is embedded in the precast part 53, the beam 4 is joined, and the precast part 53, and the beam joint. A fixing muscle 56 extending downward from the bracket 55.
For this reason, the fixing bars 56 extending downward from the beam joint bracket 55 are connected to the beam joint bracket 55 by the fixing nuts 59A and 59B, so that the fixing force of the beam joint bracket 55 to the precast portion 53 is increased. Thereby, even if a force is applied from the side of the beam steel frame 40 bonded to the beam connection bracket 55, the beam connection bracket 55 is less likely to behave in the precast portion 53. For example, even if the central portion of the beam steel frame 40 is deformed so as to bend downward, the beam joint bracket 55 is not easily displaced as the beam steel frame 40 is deformed. Therefore, it becomes possible to join the column 3 and the beam 4 firmly.
Further, in the joint member 50 made of precast concrete, it is only necessary to connect the fixing bar 56 to the beam joint bracket 55. Therefore, it is not necessary to arrange a large number of reinforcing bars, and the size and cost increase of the joint part C are suppressed. be able to. Moreover, the efficiency of the work in a construction site can be aimed at by making the joint part C into a precast concrete structure.

The beam joining bracket 55 is made of H-shaped steel having flange portions 57f on the upper and lower sides, and the fixing bars 56 are inserted into bolt insertion holes 57h formed on the upper and lower flange portions 57f of the beam joining bracket 55, and It is fixed to the upper and lower flange portions 57f by fixing nuts 59A and 59B fixed to the fixing muscle 56.
Therefore, the fixing bar 56 can be fixed to the beam joint bracket 55 only by inserting the fixing bar 56 into the flange portion 57f and fixing the fixing bar 56 with the fixing nuts 59A and 59B. As a result, the fixing strength of the beam joint bracket 55 to the precast portion 53 can be easily and reliably increased and integrated.

  The fixing line 56 has a lower end portion 56 b that protrudes downward from the precast portion 53 and is joined to the lower column 3. Therefore, the beam joint bracket 55 is fixed to the lower column 3 by joining the lower end portion 56b of the fixing bar 56 protruding downward from the precast portion 53 to the mechanical joint 36 provided on the lower column 3. . Thereby, the beam joining bracket 55 can be more firmly fixed.

(Other embodiments)
The joint member and the joint structure according to the present invention are not limited to those described in the above-described embodiment, and various modifications and replacements can be made without departing from the scope of the invention. Although the modification etc. of this invention are demonstrated below, what is the same as that of each component and member by embodiment mentioned above or similar is demonstrated using the same code | symbol.
For example, the target to which the joint member 50 and the joint structure are applied is not limited to the building structure 1 such as the tsunami evacuation facility exemplified above. As long as the column is precast concrete and the beam is steel, the present invention can be applied to any other construction, shape, and use of the building structure.
In the above embodiment, the joint member 50 includes the steel members 57A and 57B protruding in two directions from the precast portion 53 in order to join the beam steel frames 40 extending in two directions orthogonal to each other in a plan view. However, the beam steel frame 40 may be joined to the joint member 50 from one or three directions.
The fixing bars 56 are so-called reinforcing bars, but fixing members having various shapes other than the reinforcing bars may be used as long as the beam joint bracket 55 can be reliably fixed to the precast portion 53.

1 Building Structure 3 Column 4 Beam 30 Column Member 31 Column Main Reinforcement 36 Machine Joint (Joint Member)
40 Steel beam (steel frame)
50, 50T Joint member 53 Precast part 55 Beam joint bracket 56 Fixing bar (fixing member)
56b Lower end (protrusion)
57f Flange 57h Bolt insertion hole (through hole)
59A, 59B Fixing nut (nut member)
C joint part

Claims (5)

A joint member provided at a joint part for joining a precast concrete column and a steel beam,
A precast part made of precast concrete;
A beam joint bracket in which a part is embedded in the precast part and the beam is joined;
A fixing member coupled to the beam joint bracket in the precast portion and extending downward from the beam joint bracket;
A splicing member comprising: The beam joint bracket is made of H-shaped steel having flange portions on the top and bottom,
The fixing member is inserted into a through-hole formed in the upper and lower flange portions of the beam joint bracket, and is fixed to the upper and lower flange portions by a nut member fixed to the fixing member. The joint member according to claim 1, wherein   The joint member according to claim 1, wherein the fixing member has a protruding portion that protrudes downward from the precast portion and is joined to the lower column. A joint structure in which a precast concrete column and a steel beam are joined via a joint member,
The joint member is
A precast part made of precast concrete;
A beam joint bracket in which a part is embedded in the precast part and the beam is joined;
A joint structure comprising: a fixing member coupled to the beam joint bracket in the precast portion and extending downward from the beam joint bracket and coupled to the column below. The fixing member has a protruding portion that protrudes downward from the precast portion,
The joint structure according to claim 4, wherein the column below the joint member includes a joint member to which the protrusion is inserted and joined.

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