JPH0448145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a beam member used in a pre-assembled construction method.

[Conventional technology] The pre-assembled construction method is a method in which formwork, etc. is assembled on the ground in advance, and then transported to the construction site to construct the structure. It is widely adopted. According to this pre-assembled construction method, most of the work is performed on the ground with good footing, which not only ensures the safety of the work but also has the advantage of shortening the construction period.

Examples of beam members used in this type of pre-assembled construction method are those shown in FIGS. 5 and 6. This beam member A includes a concrete frame 1 having a U-shaped cross section, four main reinforcements 2 provided on the inner surface thereof, and a plurality of ribs 3 wrapped around these main reinforcements 2.
The lower two main reinforcements 2 and the cost reinforcements 3 are integrally fixed to the concrete frame 1, while the upper main reinforcements 2 are fixed to the cost reinforcements 3, thereby making the entire structure are integrated.

When constructing a concrete beam using such a beam member A, as shown in FIGS. 7 and 8, the beam member A is placed over the columns 4 and 4,
After that, concrete is poured into the inside of the beam member A. After the poured concrete hardens, beam member A
It is integrated with the beam to form a beam as a whole. In this case, the floor member 5 is installed on the beam member A, and the floor slab reinforcing bars 6 are arranged,
By pouring concrete onto the floor member 5, the floor part is created at the same time as the beam.

[Problems to be Solved by the Invention] By the way, in the above-mentioned beam member A, until the concrete poured inside hardens and integrates to form a concrete beam as a whole,
Its strength is insufficient and there is therefore a risk of it bending downward. Therefore, in the past, the floor surface 7 and the beam member A
A large number of supports 8 are provided between the beam member 1 and the beam member 1 to support the beam member 1.

However, if a large number of supports 8 are provided, it becomes a hindrance to interior construction work. Therefore, almost no interior work can be done during the 3 to 4 weeks required for the concrete to cure, resulting in the problem that the advantages of the pre-assembled construction method cannot be fully utilized.

[Object of the invention] The present invention was made to solve the above problems, and an object of the present invention is to provide a beam member for pre-assembled construction that does not require any supports or can significantly reduce the number of supports. With the goal.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention includes a concrete structure having a substantially U-shaped cross section;
In a beam member for the pre-assembled construction method, which is integrally provided with two pairs of main reinforcements extending in the longitudinal direction and a reinforcing steel wound around the entire main reinforcing steel, the reinforcing bars are made by assembling a large number of wire rods vertically and horizontally. The wire rods are inclined with respect to the main reinforcements so that the upper and lower main reinforcements and the wire rods form a substantially triangular shape, and a concrete stopper member is provided between the mesh reinforcements and the concrete frame. It is something that

[Function] In the beam member of the present invention, the wire rods constituting the mesh reinforcements, which are the ribs, are inclined with respect to the main reinforcement so that the upper and lower main reinforcements and the wire rods form a triangle. Since it is made of wire rods arranged vertically and horizontally, the main reinforcing bars and wire rods constitute a large number of truss structures, which greatly improves the strength against shearing forces. As a result, even if concrete is poured into the inside of the beam after the beam is spanned over the pillar, the beam will not bend downward. Therefore, no support is required, or even if support is required, the number of supports can be significantly reduced.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. Note that the same parts as in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted.

1 and 2 show a beam member B according to the present invention. In this beam member B, mesh reinforcements 9 are used in place of the conventional cost reinforcements wound perpendicularly to the main reinforcements. It is being Furthermore, the mesh reinforcement 9 is wound around the main reinforcement 2 in such a way that each wire rod (rib reinforcement) 9a that constitutes the mesh reinforcement 9 is inclined with respect to the main reinforcement 2 (in this case, inclined at approximately 45°). . As a result, a large number of triangles are formed between the main reinforcing bars 2, 2 by each wire 9a and the two main reinforcing bars 2, 2. In addition, the mesh muscle 9 is D10−
100 to D13-200 are used.

In addition, in this beam member B, mesh reinforcement 9
A mesh (concrete fixing member) 10 is provided between the concrete frame 1 and the concrete frame 1, which is used in place of a formwork when forming the concrete frame 1. Furthermore, a curing reinforcement 11 extending along the upper end of the concrete frame 1 is fixed to the mesh reinforcement 9.

Next, a method for manufacturing the beam member B having the above structure will be described. Examples of the method include those shown in FIG. 3 or FIG. 4.

The method shown in FIG.
The mesh 10 is placed at a distance equal to the wall thickness of the concrete body 1 from 2 (see Fig. 3A), and then the mesh reinforcement runs from one curing reinforcement 11 to the lower main reinforcement 2, 2, and the other A lower reinforcing bar 13a wound up to the curing bar 11 is charged inside the mesh 10, and then concrete is poured between the formwork 12 and the mesh 10. After this concrete hardens, the upper reinforcing bars 13b, which are formed by fixing mesh bars to the upper main bars 2, 2, are fixed to the curing bars 11, 11, thereby manufacturing the beam member B. In addition, main muscle 2, mesh muscle and curing muscle 11
are fixed to each other by welding.

In addition, the manufacturing method shown in FIG. 4 is such that a reinforcing bar 13 formed by winding a mesh bar 9 over two pairs of main bars 2, 2, 2, 2 is inserted inside a mesh 10. The other steps are the same as the above manufacturing method. In addition, in this manufacturing method, mesh muscles 9 are formed over the entire four main reinforcements 2.
Since the entire reinforcing bar 13 is integrated in advance, no curing bar is required.

Therefore, in order to construct a beam using the beam member B described above, the procedure is the same as when using the conventional beam member A described above, but when the beam member B of the present invention is used, the mesh Since each wire 9a of the reinforcement 9 and the pair of upper and lower main reinforcements 2, 2 form a triangle and constitute a so-called truss structure, the shear strength of the beam member B is greatly improved compared to conventional ones, and the beam Part B
Even if concrete is poured into the area, it will not bend downward. Therefore, the supports that were conventionally required can be completely eliminated, or even if they are required, the number of supports can be significantly reduced. Also, since no support is required,
Interior work can be done at the same time as beam construction, shortening the construction period and reducing costs by the reduction in support.

In addition, as in this embodiment, when the mesh 10 is used instead of the formwork, when concrete is poured between the formwork 12 and the mesh 10 and the beam member B is manufactured, the mesh 10 is Although there is a risk that the mesh 10 may bulge out toward the inside of the frame 12, such bulge of the mesh 10 can be prevented by the mesh lines 9.

[Effects of the Invention] As explained above, according to the pre-assembled beam member of the present invention, the mesh reinforcement, which is a rib, is constructed by assembling a large number of wire rods vertically and horizontally, and the wire rods are inclined with respect to the main reinforcement. Since the upper and lower main reinforcements and the wire rods form a triangular shape, the main reinforcements and wire rods form a large number of truss structures, which greatly improves the strength of the beam member itself. Therefore, the support that was conventionally required can be completely eliminated or can be significantly reduced. As a result, effects such as shortening the construction period and reducing costs can be obtained.

Since concrete retaining members were provided between the mesh reinforcement and the concrete frame, when pouring concrete between the formwork and the concrete retaining members to form the concrete frame, the concrete retaining members were placed inside the form. Bulging can be prevented by the meshwork muscles.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a sectional view taken along the line - in FIG. 2, FIG. 2 is a longitudinal view of beam member B, and FIG. figure,
FIG. 4 is a diagram showing a method for manufacturing the beam member B shown in FIGS. 1 and 2, and FIGS. 5 and 6 respectively.
The figures show an example of a conventional beam member, FIG. 5 is a longitudinal view thereof, FIG. 6 is a cross-sectional view taken along the - line in FIG. 5, and FIGS. A method of constructing a beam using the beam members shown in the figure is shown.
The figure is a side view. B... Beam member, 1... Concrete frame, 2...
...Main bar, 9...Mesh bar, 9a...Wire rod.

Claims (1)

[Claims] 1 For pre-assembled construction method, in which two pairs of main reinforcements extending in the longitudinal direction and ribs wound around the entire main reinforcement are integrally provided on the inner surface of a concrete frame with a substantially U-shaped cross section. In the beam member, the ribs are constituted by mesh reinforcements made by assembling a large number of wire rods vertically and horizontally, and the wire rods are inclined with respect to the main reinforcements so that the upper and lower main reinforcements and the wire rods form a substantially triangular shape, and A beam member for pre-assembled construction, characterized in that a concrete stopper member is provided between the mesh reinforcement and the concrete frame.