JP2009144398A - Construction method for column-beam connection part and reinforced concrete column-beam frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a column-beam connection part without filling it with grout. <P>SOLUTION: In this method, an upper PC column member 20 is constructed above a lower PC column member 40 to set its lower face to height being smaller than that of an upper face of a beam, and concrete is placed in a space between the upper and lower PC column members 20, 40 to constitute the column-beam connection part. When placing concrete to constitute the column-beam connection part, at least concrete is integrally placed in an upper part region in the column-beam connection part and an upper part region in an end part connected with the column-beam connection part of the beam. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for constructing a column beam joint portion of a column beam structure using a PC column member, and a reinforced concrete column beam structure in which the column beam joint portion is constructed by this method.

Conventionally, in order to shorten the construction period, a reinforced concrete structure is constructed using a PC member. As a method for constructing a joint portion using such a PC member, as shown in FIG. 16, a joint portion 738 and a beam portion 739 are integrally formed, and a reinforcing bar through-hole 731 for penetrating a column main reinforcement is provided. The PC beam / joint member 730 is built on the upper part of the PC column member 740 provided with the mechanical joint 742 on the head, and the PC column member 720 with the column main reinforcement 721 projecting on the lower surface is provided on the column. The main reinforcement 721 passes through the through-hole 731 of the PC beam / joint member 730 and is erected so as to be inserted into the mechanical joint 742 of the PC column member 740, and the grout is filled into the through-hole 731 and the mechanical joint 742. By doing so, a construction method for constructing a column beam frame is known (see, for example, Patent Document 1). In this way, when a column beam frame is constructed using PC members, it is necessary to perform joints 750 and 760 between the PC column members 720 and 740 and the PC beam / joint member 730. Normally, the joints 750 and 760 are processed by filling the joints 750 and 760 with grout.
Japanese Patent No. 3837390

  By the way, in recent years, a building using ultra-high strength concrete having a very high compressive strength for a pillar has been constructed with an increase in the height of the building. Here, if the method described in Patent Document 1 is applied to the construction of such a building, the grout filled in the joints between the full PC column members constituting the column also needs to have the same compressive strength. Become. However, there is no grout having a very high compressive strength equivalent to that of ultra-high-strength concrete, and it has not been possible to construct a column beam structure of such a building using a PC member.

  In addition, a method of joining the PC column members by placing concrete between the PC column members constituting the column is also conceivable. However, in this method, the placed concrete contracts and the surface of the concrete is raised. Therefore, a joint is formed between the upper PC pillar member and the placed concrete.

  This invention is made | formed in view of said problem, and is providing the construction method of the column beam joint part which can be constructed, without filling grout.

  The method for constructing a column beam joint according to the present invention is a method for constructing a column beam joint in which a column and a beam are joined, and an upper PC column member is supported at least on its lower surface by the beam, An upper PC column member erection step for erection above the lower PC column member so as to be lower than the upper surface of either the slab or the beam connected to the column, and the upper and lower PC columns A concrete beam placing part for placing concrete that constitutes the pillar beam joint in a space between the members, and in the concrete placing process, at least in the pillar beam joint part The upper region concrete and the upper region concrete at the end connected to the column beam joint of any one of the slabs or beams are integrally cast.

  In the construction method of the above-mentioned column beam joint part, before the concrete placing step, at least the PC beam member in which the concrete constituting the upper part of the end connected to the column beam joint part is not constructed, Including a PC beam member erection process to be built on a side portion corresponding to the column beam joint, and in the concrete placing process, at least the concrete in the upper region of the column beam joint and the concrete of the PC beam member Alternatively, at least a portion of the non-constructed portion that is in contact with the upper portion of the end portion connected to the column beam joint may be placed integrally.

  In the above method for constructing a column beam joint, a PC beam member erection step in which a PC beam member constituting the beam is built in a side portion corresponding to the column beam joint before the concrete placing step. In the concrete placing step, at least the concrete in the upper region in the column beam joint and at least the portion of the slab corresponding to the upper part of the end connected to the column beam joint are integrated. You may cast it.

The concrete that constitutes the upper and lower PC column members and the concrete that constitutes the column beam joints that are cast in the concrete placing step include high-strength concrete having a compressive strength exceeding 120 N / mm ^2. May be used.

In addition, an inclination may be provided on the lower surface of the upper PC pillar member. The inclination may be a shape that approaches the lower PC pillar member toward the center of the upper PC pillar member.
The column beam frame of the present invention is characterized in that a column beam joint is constructed by the above method.

  According to the present invention, the upper PC column member is built so that the lower surface thereof is at a lower height than the upper surface of the beam, and the upper region of the column beam connection portion and the column beam connection portion of the beam. Since the concrete in the upper region at the end to be connected is cast, the upper surface of the cast concrete is higher than the lower surface of the upper PC column member. As a result, even if the cast concrete shrinks and the height of the concrete surface is lowered, there is no gap between the cast concrete and the upper PC column member. Therefore, the column is not filled with grout. A beam joint can be constructed.

Hereinafter, an embodiment of a method for constructing a column beam joint according to the present invention will be described in detail with reference to the drawings.
1-4 is a figure for demonstrating the construction method of the column beam joint part of this embodiment.
In the method for constructing a column beam joint according to the present embodiment, an upper PC column member 20 is built above a lower PC column member 40 that constitutes a column on the lower floor, and a half that constitutes a part of the beam. The PC beam member 30 is built, and concrete is placed on the column beam joint and the upper portion of the half PC beam member 30 to construct the column beam joint. In the following description, the PC member constituting the column is constructed using high-strength concrete having a compressive strength exceeding 120 N / mm ² , and the compressive strength is also 120 N / High-strength concrete exceeding mm ² is used.

  As shown in FIG. 1, a lower PC column member 40 is connected to a plurality of column main bars 41 embedded in the member so as to extend in the vertical direction, and to the upper ends of the column main bars 41, and has a reinforcing bar insertion port on the upper surface. And a sleeve-type joint 42 provided so as to open. It is assumed that the lower PC pillar member 40 has already been built.

  The upper PC column member 20 is embedded in the member so as to extend in the vertical direction, the column main reinforcement 21 provided so that the end portion protrudes from the lower surface, and the rebar insertion hole connected to the upper end of the column main reinforcement 21 And a sleeve-type joint 22 embedded so as to open on the upper surface. In addition, the lower surface of the upper PC column member 20 is provided with an inclination that advances toward the center. The portion protruding from the lower surface of the columnar reinforcement 21 is a length that the tip reaches the sleeve type joint 42 of the lower PC column member 40 when the upper PC column member 20 is built, as will be described later. Have

  The half-PC beam member 30 includes a precast concrete 31 constituting the lower part of the beam, a beam main bar 33 at the lower end embedded in the precast concrete 31, a shear reinforcement bar 34 at the lower part embedded in the precast concrete 31, and an upper end. The beam main reinforcement 32 is provided. Further, a threaded joint 35 is attached to either one of the upper end and lower end beam main bars 33 and 32.

  When constructing the column beam joint, first, as shown in FIG. 2, the half PC beam members 30 are built from both sides of the column beam joint. And the beam main bars 33 and 32 of the upper end and the lower end of the half PC beam member 30 which oppose are joined by the screw type joint 35, respectively.

  Next, as shown in FIG. 3, the column main bar 21 is inserted into the sleeve type joint 42 of the lower PC column member, and the lower surface of the upper PC column member 20 is at a lower height position than the upper surface of the beam. The upper PC pillar member is built in so that it will come out. Then, the sleeve type joint 42 is filled with grout. In addition, although grout is filled in the sleeve type joint 42, this contributes to the joining of the column main bars 21 and 41 and does not affect the compressive strength of the column.

  Next, as shown in FIG. 4, concrete 50 constituting the column beam joint and the upper part of the beam is placed up to the upper surface height of the beam from above the vicinity of the column beam joint of the beam. At this time, as described above, the lower surface of the upper PC column member 20 is provided with an inclination that protrudes downward toward the center, so that air remains below the upper PC column member 20. Prevent and reliably fill concrete.

Here, as described above, the upper PC column member 20 is built such that the lower surface is at a lower height than the upper surface of the beam, and therefore the upper surface of the concrete 50 is higher than the lower surface of the upper PC column member 20. Will be higher. Thereby, even if the placed concrete 50 contracts and the height of the upper surface of the concrete 50 decreases, it is possible to prevent a gap from being generated between the upper PC column member 20 and the placed concrete 50.
And the column beam joint part 100 is constructed | assembled when the placed concrete hardens | cures, and a column beam frame can be constructed | assembled by repeating said operation | work.

  According to the column beam joint construction method of this embodiment, the upper PC pillar member 20 is erected so that the lower surface is lower than the upper surface of the beam, and the concrete constituting the joint and the upper part of the beam is constructed. Therefore, the upper surface of the placed concrete 50 is higher than the lower surface of the upper PC column member 20. For this reason, even if the placed concrete 50 shrinks and the height of the upper surface is lowered, it is possible to prevent a gap from being formed between the upper PC pillar member 20 and the placed concrete 50, and the grout filling work can be prevented. It becomes unnecessary.

  In addition, by providing a slope that advances toward the center on the lower surface of the upper PC pillar member 20, it is possible to prevent air from remaining below the member and to reliably place concrete in the lower portion of the member. it can.

  In the above embodiment, the beam is constructed by using the half PC beam member. However, the present invention is not limited to this, and as shown in FIG. Is possible. In such a case, the beam reinforcing bar 132 is arranged so as to penetrate the portion corresponding to the upper joint portion of the lower PC column member 40, and the shear reinforcing bar 134 is arranged so as to surround the periphery of the beam reinforcing bar 132. Then, the upper PC column member 20 is installed so that the lower surface is lower than the upper surface of the beam, the column main bars 21 and 41 are joined by the mechanical joint 42, and the beam formwork is installed. What is necessary is just to cast concrete 150 which comprises an opening | mouth part.

  It is also possible to construct the beam using full PC beam members. In such a case, as shown in FIG. 6, the concrete constituting the end portion of the beam on the column beam joint side is not constructed, and the beam main bar 232 is manufactured to be exposed in this portion. A full PC beam member 230 may be used. Such a full PC beam member 230 is erected from the side in a portion corresponding to the column beam joint, the beam main bar 232 is joined, and the upper PC column member 20 is erected so that the lower surface is lower than the upper surface of the beam. The column main bars 21 and 41 may be joined by a mechanical joint 42, and the concrete 250 constituting the end portion and the joint portion of the beam on the column beam joint portion side may be placed up to the height of the upper surface of the beam. Further, in the embodiment shown in FIG. 6, the full PC beam member 230 in which the concrete is not constructed over the entire cross section of the end portion of the beam on the column beam joint portion side is used. If the concrete that constitutes the upper portion of the end of the concrete beam constituting the full PC beam member on the side of the column beam joint is not constructed, it should be used in the method for constructing the column beam joint of the present invention. Can do.

  Moreover, in this embodiment, although the concrete which comprises the pillar base part of a pillar from the pillar head uses the PC pillar members 20 and 40 comprised by the precast concrete, as shown in FIG. The PC pillar members 320 and 340 in which the concrete constituting the pillar base part to the middle part of the pillar is made of precast concrete may be used. When such PC column members 320 and 340 are used, the concrete 350 constituting the column beam joint portion, the end portion on the beam joint portion side and the intermediate portion of the lower floor to the column head portion is punched in a lump. Just set up.

  Further, as shown in FIG. 8, the PC column member 40 that constitutes the lower floor column, the half PC beam member 30 that constitutes the lower part of the beam, and the PC joint member 480 that constitutes the lower part of the joint part are integrated. Constructed PC members 460, 470 can also be used. When such PC members 460 and 470 are used, the upper-layer PC member 470 is built, the column main bars 21 and 41 are joined, and then the concrete 450 is placed in the upper region of the joint and the upper region of the beam. By installing it, it is possible to build a column beam joint.

  Further, in each of the above embodiments, a sleeve type joint is provided so that a reinforcing bar insertion hole is opened on the upper surface of the PC member, and the column main bar is projected from the lower surface of the member, and the column main bar is connected by the sleeve type joint. Although not limited to this, as shown in FIG. 9, as shown in FIG. 9, a sleeve-type joint 22 is provided so that a reinforcing bar insertion hole is opened on the lower surface of the PC column members 20 and 40, and the column main bars 21 and 41 are arranged from the upper surface of the member. May be protruded, and the column main bars 21 and 41 may be jointed by the sleeve joint 22. Further, as shown in FIG. 10, the column main bars 21 and 41 may be protruded from the upper and lower surfaces of the PC column members 20 and 40, and the column main bars 21 and 41 may be connected by the threaded joint 62. The method of coupling the column main bars is not limited.

  In this embodiment, concrete is cast from the vicinity of the column beam joint above the beam. However, the present invention is not limited to this, and the PC column member 520 penetrates from the upper surface to the lower surface as shown in FIG. A through-hole 523 to be provided may be provided, and the concrete 550 may be placed through the through-hole 523.

  Further, in each of the above embodiments, the concrete constituting the column beam joint and the spot cast concrete of the beam are all cast integrally. However, the present invention is not limited thereto, and at least the upper region of the joint and the beam If the concrete that constitutes the upper region of the end of the joint part side is cast integrally, the concrete that constitutes the column beam joint part and the on-site concrete of the beam are cast in multiple times. Also good.

  Further, in each of the above embodiments, the lower surface of the upper PC column member is provided with an inclination so as to approach the lower PC column member toward the center. An inclination may be provided so as to approach the lower PC pillar member as it goes from one edge of the lower surface to the opposite edge, in other words, as long as the air is easy to escape when placing concrete. .

  In each of the above embodiments, the concrete constituting the upper region of the column beam joint and the concrete constituting the upper region of the joint end portion of the beam connected to the column beam joint are integrally placed. However, the present invention is not limited to this, and when the slab 602 supported by the beam 601 as shown in FIG. 12 is connected to the column 600, the upper region of the column beam joint is formed. The concrete and the concrete constituting the upper region of the joint end portion of the slab 602 with the pillar 600 may be integrally formed.

  In such a case, first, as shown in FIG. 13, a PC beam member 630 is built on the side of the column beam joint. In addition, it is not necessary to use the thing which the concrete which comprises the upper area | region of the edge part by the side of a column beam joint part used in each said embodiment as PC beam member 630 is used, and it shows in FIG. As described above, a PC beam member 630 whose end surface reaches the inside of the column beam joint, or a PC beam member whose end surface matches the outer peripheral surface of the column can be used. Then, after such a PC beam member is installed, the beam bar 232 of the PC beam member 630 that is installed so that the end faces thereof are opposed by the mechanical joint 235 is jointed.

Next, as shown in FIG. 14, the upper PC column member 620 is built such that the lower surface thereof is lower than the upper surface height of the slab 602, and the column bars 21 and 41 are joined.
Next, as shown in FIG. 15, concrete constituting the column beam joint and concrete 650 constituting the slab 602 are placed. At this time, if the concrete constituting the upper region of the column beam joint and the concrete constituting the upper region of the slab 602 are integrally cast, the concrete constituting the column beam joint and the slab 602 is not necessarily provided. It is not necessary to drive at once, and it may be divided into a plurality of times.

  In this manner, the concrete that forms the upper region of the joint end portion of the slab 602 with the column 600 and the concrete that forms the upper region of the column beam joint portion are integrally cast in the same manner as in the above embodiments. It is possible to prevent joints from being formed between the placed concrete and the upper PC column members 620 and 640.

It is FIG. (1) for demonstrating the construction method of the column beam joint part of this embodiment. It is FIG. (2) for demonstrating the construction method of the column beam joint part of this embodiment. It is FIG. (3) for demonstrating the construction method of the column beam joint part of this embodiment. It is FIG. (4) for demonstrating the construction method of the column beam joint part of this embodiment. It is a figure which shows the column beam joint part which made the concrete which comprises a beam in-situ. It is a figure which shows the column beam joint part which constructed | assembled the beam using the full PC beam member. It is a figure which shows the column beam joint part using the PC column member by which the concrete which comprises from the column base part of a column to the intermediate part was comprised with the precast concrete. Column beam joints using PC members that are constructed integrally with the PC column members that form the columns on the lower floor, the half PC beam members that form the lower part of the beam, and the PC joint members that form the lower part of the joint part FIG. It is a figure which shows a column beam joint part at the time of providing a sleeve type coupling so that a reinforcing bar insertion hole may open in the lower surface of a PC column member. It is a figure which shows the column beam joint part when the column main reinforcement is made to protrude from the member upper surface and the lower surface of the PC column member, and the column main reinforcement is connected by the screw joint 62. It is a figure for demonstrating the method of providing the through-hole which penetrates a PC pillar member from an upper surface to a lower surface, and placing concrete through this through-hole. It is a top view which shows a mode that the slab is connected to the pillar. Explains how to build a column beam joint by placing the concrete that forms the upper region of the column beam joint and the concrete that forms the upper region of the end connected to the column of the slab in one piece It is a figure for that (the 1). Explains how to build a column beam joint by placing the concrete that forms the upper region of the column beam joint and the concrete that forms the upper region of the end connected to the column of the slab in one piece FIG. Explains how to build a column beam joint by placing the concrete that forms the upper region of the column beam joint and the concrete that forms the upper region of the end connected to the column of the slab in one piece FIG. It is a figure for demonstrating the method of constructing a column beam joint part using the conventional PC member.

Explanation of symbols

20 Upper PC column member 21 Column main bar 30 Half PC beam member 31 Precast concrete 32 Lower beam main bar 33 Upper beam main bar 34 Shear reinforcement bar 35 Screw joint 40 Lower PC column member 41 Column main bar 42 Sleeve type joint 50 150, 250, 350, 450, 550 Concrete 62 Screw joint 132, 232 Beam main bar 134, 234 Shear reinforcement 230 Full PC beam member 320, 340 Full PC column member 430 Half PC beam member 460, 470 PC member 520 Through hole 600 Column 601 Beam 602 Slab 620 Upper PC column member 630 PC beam member 640 Lower PC column member 650 Concrete

Claims (7)

A method for constructing a column beam joint where columns and beams are joined,
The upper PC column member is built above the lower PC column member so that its lower surface is supported by at least the beam and is lower than the upper surface of either the slab or the beam connected to the column. The upper PC pillar member erection process,
A column beam joint portion concrete placing step for placing concrete that constitutes the column beam joint portion in a space between the upper and lower PC pillar members,
In the concrete placing step, at least the concrete in the upper region in the column beam joint and the concrete in the upper region at the end connected to the column beam joint of any one of the slabs or beams are integrated. A method for constructing a column beam joint, characterized by being placed in A method for constructing a column beam joint according to claim 1,
Before the concrete placing process,
A PC beam member erection step in which at least a PC beam member for which concrete constituting an upper portion of an end connected to the column beam joint is not constructed is built on a side portion corresponding to the column beam joint. Prepared,
In the concrete placing step, at least the upper region concrete in the column beam joint and at least the end portion of the PC beam member where the concrete is not constructed are connected to the column beam joint. A method for constructing a column beam joint, characterized by casting a part of concrete together. A method for constructing a column beam joint according to claim 1,
Before the concrete placing process,
Including a PC beam member erection step of erection of a PC beam member constituting the beam on a side portion corresponding to the column beam joint,
In the concrete placing step, at least the concrete in the upper region in the column beam joint and at least the concrete in the upper portion of the end portion of the slab connected to the column beam joint are placed. The construction method of the column beam joint part characterized by this. High-strength concrete having a compressive strength exceeding 120 N / mm ² is used for the concrete that constitutes the upper and lower PC column members and the concrete that constitutes the column beam joints that are cast in the concrete placing step. The method for constructing a column beam joint according to any one of claims 1 to 3, wherein: A method for constructing a column beam joint according to any one of claims 1 to 4,
A method for constructing a column beam joint, wherein an inclination is provided on a lower surface of the upper PC column member. A method for constructing a column beam joint according to claim 5,
The method for constructing a column beam joint is characterized in that the inclination is shaped so as to approach the lower PC column member toward the center of the upper PC column member.   7. A reinforced concrete column beam structure in which a column beam joint is constructed by the method for constructing a column beam joint according to any one of claims 1 to 6.

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