JP6288827B2 - Formwork structure of beam-column joint and construction method of beam-column joint - Google Patents

Description

  The present invention relates to a formwork structure of a column beam joint portion between a reinforced concrete column and a steel beam made of H-shaped steel, and a method for constructing the column beam joint portion.

Conventionally, it has been proposed to use a combination of formwork panels as concrete formwork when building columns and beams of reinforced concrete buildings. (See Patent Documents 1 and 2).
By using such a formwork panel, it is possible to increase the number of times the formwork is transferred, reduce construction costs such as material cost and processing cost of the formwork, and shorten the construction period.

JP 2013-144926 A Japanese Patent No. 3740610

By the way, there is a mixed frame that joins a steel beam to the column head of a reinforced concrete column. When constructing the beam-column joint of this mixed frame, after placing the steel beam, a concrete formwork is built and concrete is placed.
However, when the above-described formwork panel is built in the column beam joint, the steel beam penetrates the formwork panel, and thus it is necessary to provide a beam-type opening in the formwork panel. Therefore, the processing of the formwork panel is time-consuming, the construction period is prolonged, and the construction cost may increase.

  An object of the present invention is to provide a formwork structure of a beam-column joint and a method of constructing the beam-column joint that can shorten the work period and reduce the construction cost.

  The formwork structure of the beam-column joint according to claim 1 is a column beam composed of a reinforced concrete column (for example, a column 20 described later) and an H-shaped steel beam (for example, a steel beam 30 described later). A formwork structure of a joint (for example, a beam-to-column joint 10 described later), and a lower flange (for example, a lower flange 31A described later) and an upper flange (for example, an upper flange 31B described later) of the steel beam. A concave portion (for example, a concave portion 36 described later) between them is a position that becomes a concrete placing surface of the beam-column joint portion and is closed by a block plate (for example, a block plate 33 described later). Of the side surface that is the concrete placement surface of the portion, the portion excluding the steel beam and the closing plate is a plurality of formwork panels (for example, a below-mentioned formwork panel 40 and a beam side formwork panel 50 described later). It is covered, and a plate-shaped connecting piece ( For example, vertical ribs 35 to be described later are erected, and plate-shaped connecting pieces (for example, vertical ribs 52 to be described later) are erected on the edge of the formwork panel. The connecting piece of the frame panel and the connecting piece of the closing plate are clamped by a jig (for example, a net clamp 70 described later) and temporarily fixed to the closing plate.

According to the present invention, since the concave portion between the flanges of the steel beam is closed with the closing plate, the beam-type opening provided in the concrete mold can be made rectangular.
Furthermore, since the concrete formwork is configured by combining a plurality of formwork panels, the formwork panel can be made into a simple shape such as a rectangular shape, so that the construction period can be shortened and the construction cost can be reduced.

  Moreover, a connection piece is provided in the formwork panel and the closing plate, and the formwork panel and the closing plate are connected by clamping the connection pieces with a clamp. Therefore, since the formwork panel and the closing plate can be easily connected or disconnected using a temporary clamp, construction efficiency can be improved at low cost.

  In addition, fixing between formwork panels is not temporarily fixed between connecting formwork panels using a connecting material such as a separator, but is temporarily fixed by clamping vertical ribs of adjacent formwork panels with clamps. To do. Therefore, even if the formwork panel is installed, it does not affect the arrangement of reinforcing bars and steel materials provided in the column beam joint.

  Here, it is preferable that the closing plate is fixed to the steel beam by welding.

According to the present invention, since the closing plate is firmly fixed to the steel beam by welding, the closing plate can sufficiently withstand the side pressure of the concrete even if concrete is placed inside the closing plate.
Further, by welding the closing plate to the steel beam, the connecting pieces of the closing plate and the formwork panel can be temporarily fixed at predetermined positions with high accuracy, and the concrete formwork can be assembled.

  The method for constructing a beam-column joint according to claim 2 is a method for constructing a three-dimensional beam-column joint of a reinforced concrete column and a steel beam made of H-shaped steel, and has a plate-like shape at an edge. Preparing a block plate in which the connecting piece is erected and a formwork panel in which a plate-like connecting piece is erected on the edge, and a recess between the lower flange and the upper flange of the steel beam, At the position to be the concrete placement surface of the beam-column joint portion, the portion is closed with a closing plate, and the portion of the side surface to be the concrete placement surface of the beam-column joint portion excluding the steel beam and the closing plate, It is covered with a plurality of formwork panels, and the connecting piece of the formwork panel and the connecting piece of the closing plate are clamped by a jig, and the formwork panel is temporarily fixed to the closing plate.

  According to the present invention, there is an effect similar to that of the first aspect.

  According to the present invention, since the concave portion between the flanges of the steel beam is closed with the closing plate, the beam-type opening provided in the concrete mold can be made rectangular. Furthermore, since the concrete formwork is configured by combining a plurality of formwork panels, the formwork panel can be made into a simple shape such as a rectangular shape, so that the construction period can be shortened and the construction cost can be reduced.

1 is a perspective view of a beam-column joint to which a formwork structure of a beam-column joint according to an embodiment of the present invention is applied. It is a flowchart of the procedure which builds the column beam junction which concerns on the said embodiment. It is FIG. (The 1) for demonstrating the procedure which builds the beam-column junction part which concerns on the said embodiment. It is FIG. (2) for demonstrating the procedure which builds the beam-column junction part which concerns on the said embodiment. It is a front view which shows the state which built the concrete formwork. It is AA sectional drawing of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a beam-column joint 10 to which a formwork structure of a beam-column joint according to an embodiment of the present invention is applied.

The column beam joint 10 is a part of the structure of the building 1 and is a reinforced concrete frame having a three-dimensional shape, that is, a rectangular parallelepiped shape.
That is, the building 1 has a mixed frame including a reinforced concrete column and a steel beam, and the column beam joint 10 is a column head of the reinforced concrete column 20 of the building 1 and the reinforced concrete column 20. And four steel beams 30 made of H-shaped steel with an H-shape.

The procedure for constructing the column beam joint 10 will be described with reference to the flowchart of FIG.
First, in step S1, as shown in FIG. 3, the column 20 is constructed leaving the column head.
That is, concrete is cast to the height of the column 20 below the beam of the steel beam 30, and a portion other than the column head of the column 20 is constructed as the column housing 20A.
Here, three column main bars 21 extending upward are arranged at each of the four corners of the column housing 20A.

  In step S2, as shown in FIG. 3, the beam joining member 23 is mounted on the columnar housing 20A.

The beam joining member 23 is obtained by joining the ends of four steel beams 30 in a substantially cross shape in plan view.
Each steel beam 30 is H-shaped steel, and includes a lower flange 31A and an upper flange 31B, and a web 32 that connects the upper and lower flanges 31A and 31B.
Here, the recess 36 between the lower flange 31 </ b> A and the upper flange 31 </ b> B is closed by the closing plate 33 at a position that becomes a concrete placing surface on the side surface of the column beam joint 10.
The closing plate 33 is fixed to the lower flange 31A, the web 32, and the upper flange 31B constituting the recess 36 by welding.

The closing plate 33 is manufactured by welding and fixing an angle steel to a steel plate, and a plate-like closing plate body 34 and vertical ribs as connecting pieces erected on the outer edge of the closing plate body 34. 35.
By providing the closing plate 33, the cross-sectional shape of the steel beam 30 is rectangular at a position that becomes the concrete surface of the column beam joint 10.

In step S3, as shown in FIG.
That is, the strips 22 are arranged around the column main bars 21 and are arranged at predetermined intervals in the vertical direction. Therefore, a part of the reinforcing bars 22 are arranged through the web 32.

In step S4, as shown in FIG. 4, the concrete mold 24 is built on the columnar frame 20A.
FIG. 5 is a front view showing a state in which the concrete mold 24 is built. 6 is a cross-sectional view taken along the line AA in FIG.

The concrete formwork 24 covers a portion of the side surface that becomes the concrete placement surface of the column beam joint 10 except for the steel beam 30 and the closing plate 33.
The concrete formwork 24 includes a rectangular beam formwork panel 40 that covers a portion directly below the steel beam 30 and a rectangular beam side formwork that covers a portion between the column beam joints 10 and the steel beams 30. And a panel 50.

  The under-beam formwork panel 40 is manufactured by welding and fixing angle steel to a steel plate, and is connected to a plate-like panel main body 41 and edge portions on both sides of the panel main body 41 and extending substantially vertically. A vertical rib 42 as a piece and a horizontal rib 43 provided on the upper and lower end edges of the panel body 41 and extending substantially horizontally are provided.

  The beam-side formwork panel 50 is manufactured by welding and fixing an angle steel to a steel plate, and is provided with a plate-like panel body 51 and a connection extending substantially vertically provided on both side edges of the panel body 51. A vertical rib 52 as a piece and a horizontal rib 53 provided at the upper and lower end edges and the center of the panel main body 51 and extending substantially horizontally are provided.

  The beam-side formwork panels 50 adjacent to each other are unitized by fixing the vertical ribs 52 with bolts 54 to form a beam-side formwork unit 60. The beam-side formwork unit 60 is substantially L-shaped in a plan view, and covers the protruding corner of the column beam joint 10.

The under-beam formwork panel 40 and the beam-side formwork panel 50 sandwich the vertical rib 42 of the under-beam formwork panel 40 and the vertical rib 52 of the beam-side formwork panel 50 with a net clamp 70 as a jig. And temporarily fixed.
The beam-side formwork panel 50 and the closing plate 33 are temporarily fixed by sandwiching the vertical ribs 52 of the beam-side formwork panel 50 and the vertical ribs 35 of the closing plate 33 with the net clamp 70.

  In step S <b> 5, concrete is placed inside the concrete formwork 24.

According to this embodiment, there are the following effects.
(1) Since the concave portion 36 between the flanges 31A and 31B of the steel beam 30 is closed by the closing plate 33, the beam-type opening provided in the concrete mold 24 can be rectangular. In addition, since the concrete formwork 24 is configured by combining a plurality of formwork panels 40 and 50, the formwork panels 40 and 50 can be formed in a rectangular shape, so that the construction period can be shortened and the construction cost can be reduced.

(2) The vertical ribs 52 and 35 are provided on the beam-side formwork panel 50 and the closing plate 33, and the vertical ribs 52 and 35 are sandwiched by the net clamp 70, whereby the beam-side formwork panel 50 and the closing plate 33 are provided. And Therefore, the beam-side form panel 50 and the closing plate 33 can be easily connected to each other using the temporary net clamp 70, or the connection can be easily released.
Further, the vertical ribs 42 are provided in the under-beam form panel 40, and the vertical ribs 52, 42 are sandwiched by the net clamp 70, thereby connecting the beam-side form panel 50 and the under-beam form panel 40. . Therefore, the beam-side formwork panel 50 and the under-beam formwork panel 40 can be easily connected or disconnected.
Therefore, construction efficiency can be improved at low cost.

  Moreover, the formwork panels 40 and 50 do not temporarily fix the formwork panels facing each other using a connecting material such as a separator, but connect the vertical ribs 42 and 52 of the adjacent formwork panels 40 and 50 to the net. It is temporarily fixed by being clamped by the clamp 70. Therefore, even if the formwork panels 40 and 50 are installed, the arrangement of reinforcing bars and steel materials provided in the column beam joint 10 is not affected.

(3) Since the closing plate 33 is firmly fixed to the steel beam 30 by welding, even if concrete is placed inside the closing plate 33, the closing plate 33 can sufficiently withstand the side pressure of the concrete.
Further, by welding the closing plate 33 to the steel beam 30, the connecting pieces 35, 42, 52 of the closing plate 33 and the formwork panels 40, 50 are temporarily fixed at predetermined positions with high accuracy, and the concrete formwork 24 can be assembled.

(4) In order to reduce the construction cost, it is required to divert as much of the formwork panel as possible. However, with the wooden formwork panel, the formwork damage increases each time the diversion is repeated, and it cannot be diverted so much. There was a problem.
However, in the present invention, since the formwork panels 40 and 50 are made of steel, the accuracy at the time of formwork setting can be secured and the number of diversions can be increased.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
In this embodiment, the closing plate 33 is welded and fixed to the steel beam 30 before the formwork panels 40 and 50 are installed. However, the present invention is not limited to this, and the closing plate 33 is temporarily attached to the formwork panels 40 and 50. After the fixing, the closing plate 33 may be fixed to the steel beam 30 by welding.

  In the present embodiment, the net clamp 70 is used as a jig for connecting the mold panels 40 and 50 or between the mold panel 50 and the closing plate 33. However, the present invention is not limited to this, and a set of bolts and nuts is used. May be used.

DESCRIPTION OF SYMBOLS 1 ... Building 10 ... Column beam connection part 20 ... Column 20A ... Column frame 21 ... Column main reinforcement 22 ... Band reinforcement 23 ... Beam connection member 24 ... Concrete formwork 30 ... Steel beam 31A ... Lower flange 31B ... Upper flange 32 ... Web 33 ... Blocking plate 34 ... Plate body 35 ... Vertical rib (connecting piece)
36 ... Recess 40 ... Under-beam formwork panel 41 ... Panel body 42 ... Vertical rib (connecting piece)
43 ... Horizontal rib 50 ... Beam-side formwork panel 51 ... Panel body 52 ... Vertical rib (connecting piece)
53 ... Horizontal rib 54 ... Bolt 60 ... Beam-side formwork unit 70 ... Net clamp (jig)

Claims (2)

A formwork structure of a column beam joint of a reinforced concrete column and an H-shaped steel beam,
The column beam joint portion has a side surface that becomes a concrete placing surface directly under the steel beam,
The concave portion between the lower flange and the upper flange of the steel beam is at a position to be a concrete placing surface of the column beam joint, and is closed with a closing plate,
Of the side surface that becomes the concrete placement surface of the column beam joint, the portion excluding the steel beam and the closing plate is covered with a plurality of formwork panels,
The plurality of panels includes a beam formwork panel that covers a portion directly below the steel beam, and a beam side formwork panel that covers a portion between the steel beams.
A plate-like connecting piece is erected on the edge of the closing plate,
A plate-like connecting piece is erected on the edge of each formwork panel,
The formwork panel is temporarily fixed to the closing plate by holding the connecting piece of the formwork panel and the connecting piece of the closing plate with a jig .
The formwork structure of a beam-to-column connection part , wherein the formwork panels are temporarily fixed to each other by sandwiching connecting pieces of the formwork panels with a jig . A method for constructing a beam-column joint between a reinforced concrete column and an H-shaped steel beam,
The column beam joint portion has a side surface that becomes a concrete placing surface directly under the steel beam,
Preparing a closing plate with a plate-like connecting piece standing on the edge and a formwork panel with a plate-like connecting piece standing on the edge;
The recess between the lower flange and the upper flange of the steel beam is closed with a closing plate at a position that becomes the concrete placing surface of the column beam joint,
Of the side surface that becomes the concrete placement surface of the beam-column joint, a portion excluding the steel beam and the closing plate, a lower formwork panel that covers a portion directly below the steel beam, and the steel beams Covering with a plurality of formwork panels including a beam-side formwork panel covering a portion between ,
The connecting piece of the formwork panel and the connecting piece of the closing plate are clamped with a jig, the mold panel is temporarily fixed to the closing plate, and the connecting pieces of the formwork panel are held with a jig. And the construction method of the beam-column joint part characterized by temporarily fixing the said formwork panels mutually .

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