JP2020105694A - Floor clt construction method and floor clt structure - Google Patents

Abstract

To provide a floor CLT construction method and a floor CLT structure improved in cost.SOLUTION: A floor CLT construction method comprises the steps of: laying orthogonal laminated plates 10a, 10b to place edges on a steel beam 31; and placing concrete 33 on the orthogonal laminated plates 10a, 10b so as to cover upper faces and end faces of the orthogonal laminated plates 10a, 10b without laying reinforcing-bars 32 in cutouts formed at edges of the orthogonal laminated plates 10a, 10b and fixing the orthogonal laminated plates 10a, 10b to the steel beam 31 by cured concrete.SELECTED DRAWING: Figure 2

Description

The present invention relates to a floor CLT method and a floor CLT structure.

In recent years, the use of CLT (Cross Laminated Timer) has been proposed as a new building material for structures. The CLT is a panel in which a plurality of lamina layers are laminated and bonded so that their fiber directions are orthogonal to each other.

CLT has the following advantages. In other words, since the fibers are laminated so that the fiber directions are orthogonal to each other, it is possible to make a large-sized panel with high structural strength, and it can also be used for medium-sized or larger apartments, offices and commercial facilities it can. In addition, since the panel itself can be used as a wall or floor, the construction is simple and the construction period can be greatly shortened, as well as craftsmen with specialized skills are not required, and the construction cost due to lack of formwork It is also effective as a measure against rising prices.

Patent Document 1 describes a member in which at least one entire layer between the front lamina layer and the back lamina layer of the CLT is replaced with a lightweight cellular concrete panel in order to enhance fireproof performance.

JP, 2016-204958, A

It is desired to reduce the construction unit price in CLT construction. Particularly, in the conventional floor CLT construction method, reduction of the cost required for the joint portion between the steel frame beam and the CLT is an issue.

The present invention has been made in consideration of the above points. An object of the present invention is to provide a floor CLT method and floor CLT structure that are improved in terms of cost.

The floor CLT method according to the first aspect of the present invention is
Laying the orthogonal laminated plate so that the edge rests on the steel beam,
Without passing through the rebar in the notch formed in the edge of the orthogonal laminated plate, concrete is placed on the orthogonal laminated plate so as to cover the upper surface and the end surface of the orthogonal laminated plate, and the orthogonal shape is formed by the hardened concrete. Fixing the laminated plate to the steel beam,
Equipped with.

According to this aspect, the concrete is placed on the orthogonal laminated plate to be cured without passing the reinforcing bar through the notch that may be formed at the edge of the orthogonal laminated plate, and the orthogonal laminated plate is made of the hardened concrete. Since it is fixed to the beam, it does not require labor and an operator to process the edge portion of the orthogonal laminated plate, whereby the cost required for the joint portion between the steel beam and the orthogonal laminated plate can be significantly reduced.

The floor CLT method according to the second aspect of the present invention is the floor CLT method according to the first aspect,
In the step of laying the orthogonal laminated plate, the edge of the orthogonal laminated plate is brought into contact with the guide piece erected on the steel beam to position it.

According to this aspect, when laying the orthogonal assembly plate on the steel beam, it is possible to save the labor required for positioning the orthogonal assembly plate.

The floor CLT structure according to the third aspect of the present invention is
Steel beams,
An orthogonal assembly plate laid so that the edge is placed on the steel beam,
Concrete which is cast and cured on the orthogonal laminated plate so as to cover the upper surface and the end face of the orthogonal laminated plate, and which fixes the orthogonal laminated plate to the steel beam,
Equipped with
The edge of the orthogonal laminated plate is not formed with a notch through which a reinforcing bar is passed.

A floor CLT structure according to a fourth aspect of the present invention is a floor CLT structure according to the third aspect,
An edge of the orthogonal assembly plate is brought into contact with and positioned by a guide piece that is erected on the steel beam.

According to the present invention, it is possible to provide a floor CLT method and a floor CLT structure which are improved in cost.

FIG. 1 is a diagram for explaining a floor CLT method according to an embodiment. FIG. 2 is a diagram for explaining a floor CLT construction method according to one embodiment, and is a diagram showing a schematic configuration of a floor CLT structure according to one embodiment. FIG. 3A is a diagram for explaining a floor CLT method according to a modification of the embodiment. FIG. 3B is a view of the orthogonal assembly plate and the steel beam shown in FIG. 3A as seen from above. FIG. 4 is a diagram for explaining a floor CLT method according to a modification of the embodiment. FIG. 5: is a figure for demonstrating the floor CLT construction method which concerns on a 1st comparative example. FIG. 6 is a diagram for explaining a floor CLT method according to the first comparative example. FIG. 7A is a diagram for explaining a floor CLT method according to the second comparative example. 7B is a view of the orthogonal assembly plate and the steel beam shown in FIG. 7A as seen from above. FIG. 8: is a figure for demonstrating the floor CLT construction method which concerns on a 2nd comparative example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each figure, components having equivalent functions are designated by the same reference numerals, and detailed description of the components having the same reference symbols will not be repeated. Further, in each drawing, for convenience of easy understanding of the drawing, the scale, the vertical-horizontal dimensional ratio, and the like are appropriately changed and exaggerated.

<Floor CLT structure>
FIG. 2 is a diagram showing a schematic configuration of the floor CLT structure 30 according to the embodiment.

As shown in FIG. 2, the floor CLT structure 30 according to the present embodiment includes a steel frame beam 31, orthogonal laminated plates 10 a and 10 b, and concrete 33. Reference numeral 39 indicates a headed stud.

Of these, the orthogonal assembly plates 10a and 10b are laid on the steel beam 31 so that the edges thereof are placed thereon. In the illustrated example, the orthogonal assembly plates 10a and 10b have a structure of five layers and five plies, but the present invention is not limited to this. For example, five layers and seven plies, three layers and three plies, three layers and four plies, and seven plies. Either one of the layer 7 ply and the layer 9 ply may be used.

In the present embodiment, as shown in FIG. 1, the edges of the orthogonal assembly plates 10a and 10b are not formed with the notches through which the reinforcing bars 32 pass, and the reinforcing bars 32 are located above the orthogonal assembly plates 10a and 10b. Is arranged so as to extend parallel to the upper surfaces of the orthogonal assembly plates 10a and 10b.

The concrete 33 is cast and hardened on the orthogonal laminated plates 10a, 10b so as to cover the upper surfaces of the orthogonal laminated plates 10a, 10b and the end faces located on the steel beam 31, respectively. The orthogonal assembly plates 10a and 10b and the steel beam 31 are fixed by hardened concrete 33.

<Floor CLT method>
Next, the floor CLT construction method for constructing the floor CLT structure 30 described above will be described with reference to FIGS. 1 and 2.

First, as shown in FIG. 1, in the steel structure of a building, the orthogonal assembly plates 10a and 10b are laid so that the edges are placed on the steel beam 31.

Next, as shown in FIG. 2, the reinforcing bars 32 are arranged so as to extend parallel to the upper surfaces of the orthogonal laminated plates 10a, 10b without passing the reinforcing bars 32 through the notches that may be formed at the edges of the orthogonal laminated plates 10a, 10b. After the installation, concrete 33 is cast on the orthogonal laminated plates 10a, 10b so as to cover the upper surfaces and end faces of the orthogonal laminated plates 10a, 10b, and hardened. Then, the orthogonal laminated plates 10a and 10b are fixed to the steel beam 31 by the hardened concrete 33.

By the way, as mentioned in the problem to be solved by the invention, in the conventional floor CLT method, there has been a problem to reduce the cost for the joint portion between the steel beam and the CLT.

FIG. 5 and FIG. 6 are views for explaining a floor CLT construction method according to the first comparative example, which is a conventional floor CLT construction method.

In the floor CLT method according to the first comparative example, first, as shown in FIG. 5, the studs 35 are welded onto the steel beam 31 at a predetermined pitch, and the studs 35 are placed on the steel beam 31 of the orthogonal assembly plates 10a and 10b. The through holes 18 are drilled at the same edge as the studs 35 at the same pitch. Then, the orthogonal assembly plates 10a, 10b are laid on the steel frame beam 31 so that the studs 35 of the steel frame beam 31 are inserted into the through holes 18 of the orthogonal assembly plates 10a, 10b.

Next, as shown in FIG. 6, the through holes 18 of the orthogonal laminated plates 10a and 10b are filled with an adhesive 36 (for example, epoxy resin) and cured, and the orthogonal laminated plates 10a and 10b are fixed to the steel beam by the cured adhesive 36. Fix at 31.

In the floor CLT method according to the first comparative example, the studs 35 are welded on the steel beam 31 at a predetermined pitch before the orthogonal laminated plates 10a and 10b are laid on the steel beam 31, and Since it is necessary to have a labor and an operator to drill the through holes 18 at the same pitch as the studs 35 in the edge portion of the laminated plates 10a and 10b to be mounted on the steel beam 31, an orthogonal assembly with the steel beam 31 is required. The cost of joining the plates 10a and 10b was large.

FIG. 7A, FIG. 7B, and FIG. 8 are views for explaining a floor CLT structure according to the second comparative example, which is a floor CLT construction method originally proposed by the present inventors.

In the floor CLT method according to the second comparative example, first, as shown in FIGS. 7A and 7B, notches 19 for passing the reinforcing bars 32 are formed in the edge portions of the orthogonal laminated plates 10a, 10b. Then, the orthogonal assembly plates 10 a and 10 b are laid on the steel beam 31 such that the edge portions having the notches 19 are placed on the steel beam 31.

Next, as shown in FIGS. 7A and 7B, after the reinforcing bars 32 are arranged on the orthogonal laminated plates 10a and 10b by passing the reinforcing bars 32 through the notches 19 in the edges of the orthogonal laminated plates 10a and 10b, Concrete 33 is cast on the orthogonal laminated plates 10a, 10b so as to cover the upper surfaces and the end faces of the orthogonal laminated plates 10a, 10b and hardened. Then, the orthogonal laminated plates 10a and 10b are fixed to the steel beam 31 by the hardened concrete 33.

In the floor CLT construction method according to the second comparative example as described above, although the cost related to the joint can be reduced as compared with the floor CLT construction method according to the first comparative example, the notch 19 is previously formed in the edge portion of the orthogonal laminated plates 10a, 10b. Had to be formed.

In contrast to these comparative examples, according to the above-described embodiment, referring to FIG. 2, the orthogonal reinforcing plates 10a, 10b are not passed through the notches that may be formed at the edges of the orthogonal bonding plates 10a, 10b. Since the concrete 33 is cast on the top and hardened, and the orthogonal laminated plates 10a and 10b are fixed to the steel beam 31 by the hardened concrete 33, the labor and the operator of processing the edge portions of the orthogonal laminated plates 10a and 10b are required. It becomes unnecessary. As a result, the cost of joining the steel beam 31 and the orthogonal assembly plates 10a and 10b can be significantly reduced.

Various changes can be made to the above-described embodiment. Hereinafter, an example of the modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that may be configured in the same manner as in the above-described embodiment, and the same portions will be duplicated. The description is omitted.

<Variation of floor CLT method>
FIG. 3A, FIG. 3B and FIG. 4 are views for explaining a floor CLT method according to a modification of the embodiment.

In the floor CLT method according to the modified example, first, as shown in FIGS. 3A and 3B, a guide piece 34 is welded on the steel beam 31. Then, the orthogonal assembly plates 10a, 10b are laid on the steel beam 31 in a state where the edges of the orthogonal assembly plates 10a, 10b are brought into contact with the guide pieces 34 erected on the steel beam 31 and positioned.

Then, as in the above-described embodiment, as shown in FIG. 4, the reinforcing bars 32 are not passed through the notches that may be formed at the edges of the orthogonal laminated plates 10a and 10b, and the upper faces of the orthogonal laminated plates 10a and 10b are parallel to each other. After arranging the reinforcing bars 32 so as to extend, concrete 33 is cast on the orthogonal laminated plates 10a, 10b so as to cover the upper surfaces and end faces of the orthogonal laminated plates 10a, 10b and hardened. Then, the orthogonal assembly plates 10 a and 10 b are fixed to the steel beam 31 by the hardened concrete 33.

According to such an aspect, the guide piece 34 needs to be welded onto the steel beam 31 before the orthogonal assembly plates 10a and 10b are laid on the steel beam 31, but the above-described embodiment is used. Similarly, since it is not necessary to process the edge portions of the orthogonal laminated plates 10a and 10b and the operator, the cost for the joint can be significantly reduced. Further, according to such an aspect, when laying the orthogonal assembly plates 10a, 10b on the steel beam 31, it is possible to save the labor required for positioning the orthogonal assembly plates 10a, 10b.

The description of the above-described embodiments and individual modifications and the disclosure of the drawings are merely examples for explaining the invention described in the claims, and the above-described embodiments and individual modifications The description or the disclosure of the drawings does not limit the invention described in the claims. The constituent elements of the above-described embodiments and individual modifications can be arbitrarily combined without departing from the gist of the invention.

10a, 10b Orthogonal assembly plate 18 Through hole 19 Notch 30 Floor CLT structure 31 Steel beam 32 Reinforcing bar 33 Concrete 34 Guide piece 35 Stud 36 Adhesive 39 Headed stud

Claims (4)

Laying the orthogonal laminated plate so that the edge rests on the steel beam,
Without passing through the rebar in the notch formed in the edge of the orthogonal laminated plate, concrete is placed on the orthogonal laminated plate so as to cover the upper surface and the end surface of the orthogonal laminated plate, and the orthogonal shape is formed by the hardened concrete. Fixing the laminated plate to the steel beam,
The floor CLT method is characterized by being equipped with. In the step of laying the orthogonal laminated plate, the edge of the orthogonal laminated plate is brought into contact with the guide piece erected on the steel beam to be positioned,
The floor CLT method according to claim 1, wherein the floor CLT method is used. Steel beams,
An orthogonal assembly plate laid so that the edge is placed on the steel beam,
Concrete which is cast and cured on the orthogonal laminated plate so as to cover the upper surface and the end face of the orthogonal laminated plate, and which fixes the orthogonal laminated plate to the steel beam,
Equipped with
A notch through which a reinforcing bar is passed is not formed at the edge of the orthogonal laminated plate,
A floor CLT structure characterized in that The edge of the orthogonal assembly plate is positioned by abutting on a guide piece erected on the steel beam.
The floor CLT structure according to claim 3, wherein: