JPH0749708B2 - Form plate and method for constructing steel-concrete beam using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a). BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a form plate and a method for constructing a steel-framed concrete beam using the same, which can be applied when constructing a steel-framed concrete beam.

(B). 2. Description of the Related Art Conventionally, shaped steel such as H-shaped steel is installed in parallel as a form plate, and concrete mortar is provided between the installed shaped steels (in this specification, "concrete mortar" means "concrete mortar"). Or “mortar”) is placed to construct a beam.

In such a method, since it is necessary to adhere between the concrete mortar to be cast inside the formwork and the shape steel, studs are planted on the side where the concrete mortar of the shape steel is to be cast. ing.

Further, in Japanese Patent Laid-Open No. 53-90612, etc., when a beam is constructed, a form plate is used as a steel frame material after the construction, and a reinforcing bar is reinforced on the inside of the form plate. A configuration for arranging in space is disclosed.

(C). Problems to be Solved by the Invention However, this has a disadvantage in that much work is required for the work of planting the stud.

Also, in the case of steel-framed reinforced concrete where reinforcing steel bars can be placed in the concrete pouring space,
Since the reinforcing bars placed in the concrete placing space can support the bending stress of the beam, there is no problem,
If you want the formwork plate to function as a steel frame after building the beam, and if you want to build a steel-framed concrete beam where no reinforcement is placed in the concrete placing space of the beam,
If a shaped steel such as an H-shaped steel is simply used as the form plate, there is a disadvantage that the strength as a beam is insufficient and an appropriate beam driving construction cannot be performed.

Further, when constructing a steel-framed steel-concrete beam, since the reinforcing bar is arranged in the concrete placing space of the beam, the formwork plate which functions as a steel frame material after construction is connected to the slab side through the reinforcing bar. However, in the case of a steel-framed concrete beam in which the concrete pouring space of the beam is unreinforced, the means for connecting the formwork plates does not exist in the concrete pouring space of the beam. The inconvenience was met because some measure was required to connect the functioning form plate to the slab side.

INDUSTRIAL APPLICABILITY The present invention can properly construct a steel-framed concrete beam in which the work of planting studs is unnecessary and no reinforcement is placed in the concrete placing space of the beam in order to solve the above-mentioned drawbacks. Moreover, it is an object of the present invention to provide a formwork plate capable of smoothly connecting a formwork plate, which functions as a steel frame material after construction, to a slab in a steel-framed concrete beam, and a method for constructing a steel-framed concrete beam using the formwork plate. It is what

(D). Means for Solving the Problems That is, the invention according to claim 1 of the present invention functions as a formwork when the concrete mortar (9) of the steel-framed concrete beam (1) is placed, and the In a steel form plate (3) that functions as a steel aggregate of a steel-framed concrete beam (1), a pair of opposing flange portions (3a, 3a)
And a web portion (3b) between the pair of flange portions (3a, 3a), and a U-shaped concrete contact surface between the pair of flange portions (3a, 3a) and the web portion (3b). (3e)
And a pair of flange portions (3a, 3a) each having a wall thickness greater than that of the web portion (3b). ) Is provided with a slab connection means (3c) on one side thereof so as to project to the side opposite to the side where the web portion (3b) is located, and a large number of slab connection means (3e) are provided on the side of the concrete contact surface of the web portion (3b). It is configured by forming unevenness (3d).

In the invention according to claim 2 of the present invention, the formwork plate (3) according to claim 1 is provided below the position where the slab (2) is to be placed, and the concrete contact surface (3e) is left and right. A pair of molds, which are opposed to each other in a direction, and in which the slab connecting means (3c) of the mold plate (3) are respectively arranged at positions where the slab (2) should be placed, and the pair of installed molds. A frame plate (3, 3) is provided with a floor plate (6) so as to close a gap (5) formed between the lower flange portions (3a, 3a) between the frame plate (3, 3), and the pair of form plates (3, 3). )
The flooring plate (6) and the floor plate (6) form a concrete placing space (7) in which no reinforcing member is provided inside, and the position where the slab (2) is to be placed and the reinforcing member is provided inside the formed space. Concrete placing space not provided (7)
A concrete mortar (9) is cast inside to construct a steel-framed concrete beam (1).

It should be noted that the numbers in parentheses indicate the corresponding elements in the drawings for the sake of convenience, and thus the present description is not limited to the description in the drawings. The following “(e).
The same applies to the column of "action".

(E). Action With the above-mentioned structure, the mold plate (3) according to claim 1 of the present invention has a web portion (3b) on which a large number of irregularities (3d) are formed and is thicker than the web portion (3b). The formed pair of flange portions (3a, 3a) act so as to form a U-shaped concrete contact surface (3e).

Further, in the method for constructing a steel-framed concrete beam (1) according to claim 2 of the present invention, the pair of form plates (3, 3) are provided with slabs (2) via respective slab connecting means (3c). ) And integrated with the concrete mortar (9) placed in the concrete placing space (7) through the respective unevenness (3d), the steel concrete beam (1) They act to function as steel aggregates.

(F). Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of a steel-framed concrete beam constructed by using an example of a form plate according to the present invention.

The steel-framed concrete beam 1 is provided on the lower surface of the upper slab 2 as shown in FIG.
Has a pair of mold plates 3 and 3 made of steel.

The form frame plates 3 are provided so as to face each other and extend in a direction perpendicular to the plane of the drawing.
Has a pair of vertically opposed flanges 3a, 3a. A web portion 3b made of a rib steel plate or the like is provided between the pair of flange portions 3a and 3a, and the pair of flange portions 3a and 3a and the web portion 3b form a U-shaped concrete contact surface 3e. , Are connected to each other, and a large number of irregularities 3d are formed on the concrete contact surface 3e side of the web portion 3b. Further, each of the pair of flange portions 3a, 3a,
It is formed thicker than the web portion 3b. One of the pair of flange portions 3a, 3a, that is, the upper surface of the upper flange portion 3a, 3a in the figure has a large number of studs 3c for connecting the form plate 3 and the slab 2, and is opposite to the side where the web portion 3b is located. And is planted at a predetermined interval in a direction perpendicular to the paper surface so as to project to the side, and further, the flange portions 3a below the form plates 3 and 3,
Between the 3a, a floor plate 6 is provided so as to close the gap 5 generated between the two. In addition, the form plate 3,
3, the concrete mortar 9 in the concrete placing space 7 formed between the floor plate 6 and the lower surface of the slab 2.
Has been placed.

Since the steel-framed concrete beam 1 has the above-mentioned structure, when constructing the beam, first, the mold plate 3 is formed, and the flange portions 3a and 3a and the unevenness 3d which form the mold plate 3 are formed. It is manufactured by welding the web portion 3b. The steel plate forming the web portion 3b having the irregularities 3d is
Since it is commercially available as a rib steel plate, etc., the form plate 3
Can be easily manufactured. When the form plate 3 is manufactured in this way, as shown in FIG.
A pair of form plate 3, 3 below the position where the
Are installed so that the concrete contact surfaces 3e are opposed to each other in the left-right direction and the studs 3c of the form plate 3 are respectively arranged at the positions where the slabs should be placed (at this point, the slabs 2 are No concrete mortar is placed at the position where it should be placed, and the concrete mortar in the slab 2 part is placed at the same time as the placement on the beam 1). Further, the floor plate 6 is installed in such a manner as to close the gap 5 formed between the pair of frame plates 3 thus installed and the lower flange portions 3a between them. Then, the flooring plate 6 and the pair of frame plates 3 and 3 form a concrete placing space 7 in a state where no reinforcing member is provided inside. Therefore, concrete mortar 9 is struck in the slab 2 portion and in the concrete placing space 7 in which the reinforcing member is not provided inside the slab 2 in a form in which the formwork plates 3 and 3 function as a formwork. Installation, and the construction of the steel-concrete beam 1 is completed. In this way, the cast and solidified concrete mortar 9 and the formwork plate 3
Adhesion between and is generated in good condition due to the unevenness 3d formed on the web portion 3b of the form plate 3. In addition, each form plate 3 is fixedly connected to the slab 2 portion via a stud 3c, and also functions as a steel frame member of the beam 1.

(G). EFFECTS OF THE INVENTION As described above, according to the invention of claim 1 of the present invention, the concrete mortar 9 of the steel-framed concrete beam 1 functions as a formwork at the time of placement, and after the placement, the steel-framed concrete. In the steel form plate 3 that functions as the steel aggregate of the beam 1, a pair of opposed flange portions 3a,
3a, the web portion 3b between the pair of flange portions 3a, 3a
A pair of flange portions 3a, 3a and the web portion 3b to form a U-shaped concrete contact surface 3e connected to each other, and the pair of flange portions 3a, 3a.
Each of them is formed to be thicker than the web portion 3b, and a slab connecting means such as a stud 3c is provided on one of the pair of flange portions 3a, 3a so as to project to the side opposite to the side where the web portion 3b is located. Provided, the concrete contact surface 3e of the web portion 3b
Since the mold plate 3 is formed by forming a large number of irregularities 3d on the side, the mold plate 3 has a web portion 3b having a large number of irregularities 3d, and a pair of flange portions 3a formed to be thicker than the web portion 3b. 3a
Form a U-shaped concrete contact surface 3e.

Therefore, when the formwork plate 3 is made to function as a formwork, the adhesion between the formwork plate 3 and the concrete / mortar should be taken through a large number of irregularities 3d provided on the concrete contact surface 3e side. This makes it possible to eliminate the trouble of planting studs or the like on the form plate.

In addition, when the formwork plate 3 is made to function as a steel frame member of a steel-framed concrete beam, a pair of opposed flange portions 3a,
3a is arranged above and below the U-shaped concrete contact surface 3e, and the thickness of the flange portions 3a, 3a exerts sufficient rigidity so that bending stress generated in the beam can be accurately supported. Becomes Therefore, the steel-framed concrete beam using the formwork plate 3 as a steel frame member has a shape having sufficient strength as a beam. Therefore, if the formwork plate 3 according to the present invention is used, it is possible to properly construct an unreinforced steel-framed concrete beam in which no reinforcing material such as a reinforcing bar is placed in the concrete placing space of the beam.

Further, the formwork plate 3 which functions as a steel frame has a side opposite to the side where the web portion 3b is located, that is, a concrete contact surface.
It can be smoothly connected to the slab 2 via the slab connecting means provided on the upper side of 3e. For this reason, the slab connecting means is inevitably arranged at the portion where the slab 2 is to be constructed simply by installing the form plate 3 at the position where the beam is to be constructed, and the form plate 3 is used as a steel frame material. When constructing a steel-framed concrete beam, a steel-framed concrete beam using the formwork plate 3 as a steel frame material is provided without providing any reinforcing bars or the like for connecting to the slab 2 in the concrete placing space of the beam. Can be accurately connected and integrated with the slab 2 by the slab connection means. As a result, suitable stress transmission between the slab 2 and the steel-framed concrete beam 1 becomes possible.

Further, according to the invention of claim 2 of the present invention, the formwork plate 3 of claim 1 is made to face the concrete contact surface 3e in the left-right direction below the position where the slab 2 is to be placed. In addition, a pair of slab connecting means such as the studs 3c of the form plate 3 are installed at positions where the slab 2 is to be placed, and a pair is installed between the pair of form plate plates 3 and 3. The floor plate 6 is installed so as to close the gap 5 formed between the lower flange portions 3a, 3a, and the pair of mold plates 3, 3 and floor plate 6 does not provide a reinforcing member inside the concrete. A concrete mortar 9 is cast into a concrete casting space in which a casting space 7 is formed and the slab 2 is to be cast and in which a reinforcing member is not provided inside the steel reinforced concrete. Build beam 1 Since it is configured in manner, only by performing the installation work of a pair of mold plates 3,3, the irregularities 3d of the mold plate 3 can be arranged in the concrete 設空 seven. This makes the concrete of the beam
The mortar 9 and each form plate 3 are firmly fixed and connected, and as a result, the form plate 3 capable of accurately supporting the bending stress generated in the beam as described above is attached to the steel concrete beam 1. It is possible to properly function as a steel aggregate.

Further, the slab connecting means can be arranged at the driving construction position of the slab 2 by the installation work of the pair of mold plates 3 and 3. For this reason, the reinforcing bars and the like for connecting the form plate 3 to the slab 2 must be installed in the concrete pouring space 7
It is possible to smoothly connect the steel-framed concrete beam 1 and the slab 2 without separately arranging them. Therefore, the workability relating to the construction of the beam is good, and the unreinforced steel-framed concrete beam 1 in which any reinforcing material is not placed in the concrete placing space 7 can be suitably constructed with a small amount of work.

Further, when using the formwork plates 3, in order to use the U-shaped concrete contact surfaces 3e in a pair so as to face each other in the left-right direction, the installation intervals of the pair of formwork plates 3 and 3 are set. The beam width can be freely selected by adjusting. Therefore, the degree of freedom in beam design is high and construction is easy. Further, since the formwork of the steel-framed concrete beam 1 is an on-site assembly of the formwork plate 3 and the floor plate 6, material for the framework such as the formwork plate 3 and the floor plate 6 before the formwork assembly. Can be stored in layers,
Does not take storage space. Moreover, since the steel-framed concrete beam 1 that is a construction is one in which the form plate 3 is made of steel frame and is a non-reinforced structure that does not require a reinforcing material such as a reinforcing bar, a storage place for the reinforcing material is also available. It is unnecessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a steel-framed concrete beam constructed by using an example of a form plate according to the present invention. 1 …… Steel concrete beam 2 …… Slab 3 …… Form plate 3a …… Flange part 3b …… Web part 3c …… Slab connection means (stud) 3d …… Asperity 3e …… Concrete contact surface 5 …… Gap 6 ...... Floor plate 7 ...... Concrete placement space 9 ...... Concrete mortar

Claims (2)

[Claims] 1. A pair of opposed flange portions in a steel form plate which functions as a formwork when placing concrete mortar of a steel-framed concrete beam and which functions as a steel aggregate of the steel-framed concrete beam after placement. A web portion is provided between the pair of flange portions, and the web portions are connected to each other in such a manner that the pair of flange portions and the web portion form a U-shaped concrete contact surface. Each of the pair of flange portions is formed to be thicker than the web portion, and one side of the pair of flange portions is provided with a slab connecting means in a form projecting to the side opposite to the side where the web portion is located. A form plate, which is formed by forming a large number of irregularities on the concrete contact surface side. 2. The form plate according to claim 1 below the position where the slab is to be cast, the concrete contact surfaces are opposed to each other in the left-right direction, and the slab connecting means of the form plate is the slab. Are installed at positions where they are to be placed, and the floor plate is installed so as to close the gap between the lower flange portions between the pair of installed form plates. The formwork plate and the floor plate form a concrete placing space in which no reinforcing member is provided inside, and the position where the slab should be placed and the concrete placing where the reinforcing member is not provided inside the formed slab. A method for constructing a steel-framed concrete beam, in which concrete mortar is placed in the installation space to construct a steel-framed concrete beam.