JP2000303599A - Lightweight cellular concrete panel and installing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain an increase in the number of main reinforcements or an increase in a diameter by fixing a rectangular plate-like anchor member having no female screw hole for an anchor bolt to the main reinforcements so that the long side becomes the direction of the main reinforcements. SOLUTION: Main reinforcements 2a, 2b and sub-reinforcements 2c, 2d orthogonal to the main reinforcements 2a, 2b are formed in a lattice shape to constitute a reinforcing bar mat. This reinforcing bar mat is embedded by one stage or more in the tickness direction when manufacturing a lightweight cellular concrete panel 1. A rectangular plate-like anchor member 12 is fixed to the main reinforcements 2a, 2b of the reinforcing bar mat so that the long side becomes the direction of the main reinforcements 2a, 2b. Thus, the anchor member 12 formes a rectangular plate shape, and the long side is fixed in parallel to the main reinforcements 2a, 2b to thereby relieve stress generated in the main reinforcements 2a, 2b to thus restrain an increase in the number of main reinforcements or the cross-sectional area to reduce a manufacturing cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lightweight cellular concrete panel and a method for reinforcing the panel.

[0002]

2. Description of the Related Art Conventional lightweight cellular concrete panels are:
As shown in FIG. 4 which is a perspective view thereof, the lightweight cellular concrete panel 1 has embedded therein a reinforcing bar mat including a main bar and a sub bar perpendicular to the main bar. The main reinforcement is buried along the long side of the lightweight cellular concrete panel, and is usually attached to the building frame so that the main reinforcement is vertical. The reinforcing bar mat includes an outer reinforcing bar mat buried on the front side of the panel, that is, the side opposite to the frame, and a back side reinforcing bar mat buried on the back side of the panel. The outer reinforcing bar mat includes an outer main bar 2a and an outer sub bar 2c, and the inner reinforcing bar mat includes an inner main bar 2b and an inner sub bar 2d. Outer main bar 2a
Alternatively, an anchor metal 4 having a trapezoidal cross section is fixed to the outer accessory bar 2c, and an anchor nut 3 is fixed to the anchor metal 4.

[0003] Such lightweight cellular concrete panels are mounted as shown in FIG. That is, by screwing the anchor bolts 5 penetrating the inazuma plate 6 into the anchor nut 3, the inazuma plate is mounted on the lightweight cellular concrete panel. The lightweight cellular concrete panel is attached to the building frame by engaging a progression plate of the lightweight cellular concrete panel with a ruler angle 7 welded to the beam 8a of the building frame.

In a lightweight cellular concrete panel mounted by such a method, the parapet 1
Since 0 is cantilevered, a bending moment in which the outer surface 9 becomes convex is generated, a tensile stress is generated in the outer reinforcing bar 2a, and the tensile stress is maximized near the anchor nut 3.

As a method for reinforcing the tensile stress, a method of increasing the number of outer main bars as shown in FIG.
Alternatively, a method of increasing the sectional area of the outer main bar 2a is performed.

[0006]

However, according to this method, the embedded anchor nut 3 must be accurately positioned and attached to the reinforcing bar mat at the time of manufacturing the lightweight cellular concrete panel. It is necessary to prepare panel types having different positions of the anchor nut for each dimension, and there is a problem that the number of panel types increases and the management cost in panel manufacturing increases.

[0007] Further, when the dimensional accuracy of the building frame is slightly deviated, there is a problem that it cannot be mounted at the position of the embedded anchor nut prepared.

Further, as a method for reinforcing the bending moment, a method of increasing the number of main bars or increasing the cross-sectional area thereof is as follows.
There is a problem that raw material costs increase.

The present invention solves the above-mentioned problems in the prior art and suppresses an increase in the number of panel types due to a difference in the position of the anchor nut without accurately positioning the position of the anchor nut during manufacturing. It is another object of the present invention to provide a lightweight cellular concrete panel which suppresses an increase in the number of main bars or an increase in diameter, and a method of mounting the same.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a lightweight cellular concrete panel in which a reinforcing bar mat comprising a main bar and a secondary bar perpendicular to the main bar is embedded so that the main bar extends in the long side direction. A lightweight cellular concrete panel in which a rectangular flat anchor member having no female screw hole is fixed to the main reinforcement so that the long side thereof is in the direction of the main reinforcement, and the above lightweight cellular concrete panel is attached to the building frame by tapping screws. It is a method of mounting, inserting a tapping screw penetrating the fixing metal from the back of the lightweight cellular concrete panel, screwing the tapping screw to the anchor member, attaching the fixing metal to the lightweight cellular concrete panel, and attaching the fixing metal to the building frame The method of attaching the lightweight cellular concrete panel to be attached to the building frame.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a lightweight cellular concrete panel according to the present invention will be described. A reinforcing bar mat embedded in a lightweight cellular concrete panel is formed by forming a main bar and a sub bar perpendicular to the main bar in a lattice shape. As this reinforcing bar mat, carbon steel is used for the main bar and the secondary bar,
A main bar and a sub bar are fixed at the intersection thereof by welding or the like, or a reinforcing bar formed in a lattice shape is used. It is preferable to use carbon steel in terms of ease of production. As a main reinforcing bar of the reinforcing bar mat using carbon steel, for example, carbon steel of 5 to 12 mmφ is used, and as a secondary bar, carbon steel of 5 to 7 mmφ is used. In that case, the size of each grid is 40 to 300 m on one side.
m, and the other side is 100 to 800 mm is practical.

At the time of manufacturing the lightweight cellular concrete panel, the reinforcing bar mat is buried in one or more steps in the thickness direction. A rectangular flat anchor member is fixed to the main reinforcement of the reinforcing bar mat so that the long side thereof is in the direction of the main reinforcement. Such an anchor member is not provided with a female screw hole into which an anchor bolt is screwed. Concretely, if there is no through hole, even if there is a through hole, when the fixing hardware is attached to the lightweight cellular concrete panel with a tapping screw and the fixing hardware is attached to the building frame, the lightweight cellular concrete panel is substantially attached to the building frame Anything that can be attached with a high strength can be used as the anchor member of the present invention.

As the material of the anchor member, a metal such as carbon steel or plywood can be used. As the metal, carbon steel, stainless steel or the like is used. When using carbon steel as the anchor member, its shape is 50-150 mm x 1
Those having a range of 50 to 400 mm and a thickness of 1.6 to 6 mm are practical. Also, when using plywood, 100 ~
Those having a range of 200 mm x 200 to 500 mm and a thickness of 9 to 24 mm are practical.

When the reinforcing mat is buried in two or more stages,
It is preferable to fix the anchor member to the reinforcing bar mat located on the outer side (the outer surface side of the building) because the strength of the panel is further improved.

When the anchor member is fixed to the main bar, the anchor member can be fixed directly or indirectly to the main bar. However, the stress generated in the main bar is transmitted to the anchor member and the stress of the main bar is relieved. Is preferable. As a fixing method, a method such as welding, adhesion, fitting, or the like is employed. Further, it can also be indirectly attached to the main reinforcement via an auxiliary member by a method such as welding, adhesion, fitting, or the like.

When carbon steel is used as the anchor member and the reinforcing bar mat, the anchor member is fixed to the main bar before the rust preventing process of the reinforcing bar mat, and the rust preventing process is performed on the anchor member and the reinforcing bar mat at the same time. However, it is preferable because the durability of the lightweight cellular concrete panel is ensured and the manufacturing cost is reduced.

Next, a method of attaching the lightweight cellular concrete panel to a building frame will be described.

A tapping screw is inserted from the back of the lightweight cellular concrete panel (the side facing the building frame) and screwed into the anchor member. At this time, a fixing hardware is previously passed through the tapping screw. The fixing hardware is attached to the lightweight cellular concrete panel by screwing the tapping screw to the anchor member and fixing it to the anchor member.

The tapping screw has a diameter of 5-10.
mm is practical, and carbon steel or stainless steel is used as the material.

Next, the fixing hardware is attached to the building frame.
As the fixing hardware, those having various shapes including a general inazuma plate are used.

For this attachment, the frame and the fixing hardware may be welded or attached by bolts. However, a method is used in which an inazuma plate is used as the fixing hardware and the inazuma plate is engaged with a ruler angle welded to the upper surface of the beam. Adoption is preferable because of excellent workability.

[0022]

The anchor member according to the present invention has a rectangular flat plate shape, and its long side is fixed to the main bar parallel to the main bar. Therefore, the stress generated in the main bar is reduced. At the same time, since a female threaded hole for an anchor bolt or the like is not provided at the time of manufacturing a lightweight cellular concrete panel, an operation of specifying an accurate anchor position at the time of manufacturing is not required.

[0023]

EXAMPLES Examples and comparative examples of the present invention will be described below.

Embodiment 1 FIG. 1 is a perspective view of an example of a lightweight cellular concrete panel according to the present invention assuming the following.

The lightweight cellular concrete panel 1 is made of JIS
A 5416, and the dimensions were 600 mm in width, 1,800 mm in length, and 100 mm in thickness. Built-in reinforcement mats are all made of SS40
The outer main bar 2a, the inner main bar 2b, the outer sub bar 2c, the inner sub bar 2c, and the inner sub bar 2d were used. The intersection of the main and accessory bars was welded as specified in JIS A 5416. Further, two auxiliary main bars 11 were attached to the outer auxiliary bar 2c by welding so as to be in the direction of the main bar. The auxiliary main bar 11 had the same material and diameter as the main bar.

An anchor steel plate 12 as an anchor member
Has a material of SS400, dimensions of 70 mm in width and 150 in length
mm and a thickness of 3.2 mm. This anchor steel plate was attached to the auxiliary main reinforcing bar 11 by welding so that the longitudinal direction thereof was in the axial direction of the main reinforcing bar 2a. There were a total of six welding locations 13.

The anchor steel plate is installed at two places for one lightweight cellular concrete panel, and the distance from the tip of the parapet to the center of the length of the anchor steel plate is 600 m on the parapet side.
m, and on the non-parapet side, the distance from the tip of the tip to the center of the length of the anchor steel plate was 120 mm.

The reinforced mat obtained as described above was subjected to a rust-proof treatment, and a lightweight cellular concrete panel was produced by a usual production method.

The obtained lightweight cellular concrete panel was subjected to a bending strength test assuming a normal wind pressure of the parapet portion by the method shown in FIG. That is, the lightweight foam concrete panel 1 is leveled so that the anchor steel plate is at the top, and a parapet portion is assumed, and the lower surface of a portion 600 mm from one foreface is supported, and the upper surface of a portion 100 mm from the other foreface is supported. I do. On the other hand, a load P is applied to the upper surface of a part 100 mm from the fore-edge surface (assuming a parapet part).
As a result, the load P causing cracking was 622 kgf.

Comparative Example 1 A lightweight cellular concrete panel was manufactured in the same manner as in Example 1 except that no anchor steel plate was used.

The obtained lightweight cellular concrete panel was subjected to a bending strength test assuming a normal wind pressure of the parapet portion by the method shown in FIG. 5, and the load P at which cracking occurred was 136 kgf.

Comparative Example 2 A trapezoidal anchor metal member 4 having an anchor nut 3 as shown in FIG. 4 was fixed to the outer main reinforcing bar 2a without using the anchor steel plate and the auxiliary main reinforcing bar of Example 1. Built-in reinforcement mats are all made of SS40
0 and a diameter of 5.5 mm were used. The number of the outer main bars 2a and 2e is 10, the inner main bar 2b is 4,
It was the same as that of Example 1 except that the number of the outer accessory muscle 2c was eight and the number of the inner accessory muscle 2d was eight. A lightweight cellular concrete panel was manufactured using this reinforcing bar mat. In addition, anchor nuts are installed at two places for one lightweight cellular concrete panel, the distance from the tip of the parapet to the center of the anchor nut is 600 mm, and the distance from the tip of the parapet to the center of the anchor nut is the non-parapet side. It was 120 mm.

When the obtained lightweight cellular concrete panel was subjected to a bending strength test by a method shown in FIG. 5 assuming that the parapet portion was under a normal wind pressure, the load P at which cracking occurred was 584 kgf.

Example 2 The lightweight cellular concrete panel obtained in Example 1 was attached to a building frame as shown in FIG. That is, a tapping screw 15 having a diameter of 8 mm was inserted from the back surface (the surface opposite to the outer surface 9) of the lightweight concrete panel 1 and screwed to the anchor steel plate 12. At that time, the tapping screw 15 had penetrated the inazuma plate 6 as a fixing hardware. In addition, the part where the tapping screw 15 is inserted is provided with ruler angles 7a and 7
b corresponds to the beams 8a and 8b of the welded building frame. The inazuma plate 6 was attached to the lightweight cellular concrete panel 1 by screwing the tapping screw 15 to the anchor steel plate 12. Next, the lightning concrete panel is attached to the building frame by engaging the progress plate 6 with the ruler angles 7a and 7b, and the parapet 10
Was configured. Numeral 14 denotes a weight receiving hardware welded to the ruler angle 7b.

In this embodiment, the height interval H between the beams 8a and 8b of the building frame is variously changed.
In the range of 10 mm, the lightweight cellular concrete panel could be attached to the building frame.

Comparative Example 3 The lightweight cellular concrete panel obtained in Comparative Example 2 was attached to a building frame as shown in FIG. That is, bolt holes were drilled from the back surface of the lightweight cellular concrete panel 1 (the surface opposite to the outer surface 9) to a portion of the anchor hardware 4 corresponding to the nut 3. Insert the bolt 5 penetrating the progress plate 6 from this bolt hole,
The nuts plate 6 was screwed into the nut 3 and attached to the lightweight cellular concrete panel. Next, this inazuma plate is fixed to ruler angles 7a, 7 welded to beams 8a, 8b.
b, the lightweight cellular concrete panel 1 was attached to the skeleton. Reference numeral 10 denotes a palpettte section, and reference numeral 14 denotes a weight receiving hardware.

When the height interval H between the beams 8a and 8b of the building frame was variously changed, a lightweight cellular concrete panel could be attached to the building frame only when H was 1,080 mm.

[0038]

According to the present invention, an increase in the number or cross-sectional area of the main bars can be suppressed, and the manufacturing cost can be reduced.

Further, it is possible to suppress an increase in manufacturing cost due to accurate positioning of the anchor nut at the time of manufacturing and an increase in the number of panel types due to a difference in the position of the anchor nut.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example lightweight cellular concrete panel according to the present invention assuming a parapet section.

FIG. 2 is a side view showing an example of attaching a lightweight cellular concrete panel to a building frame according to the present invention.

FIG. 3 is a side view showing attachment of a lightweight cellular concrete panel to a building frame according to a conventional example.

FIG. 4 is a perspective view of a lightweight cellular concrete panel according to a conventional example.

FIG. 5 is an explanatory view of a bending strength test method assuming a normal wind pressure of a parapet part.

[Explanation of symbols]

 1: lightweight cellular concrete panel 2a: outer main bar 2b: inner main bar 2c: outer sub bar 2d: inner sub bar 2e: outer main bar with increased number 4: anchor hardware 5: anchor bolt 6: inazuma plate 8a, 8b: building Building beam 10: Parapet 11: Auxiliary main bar 12: Anchor steel plate 14: Panel own weight receiving hardware 15: Tapping screw H: Height gap between building building beams 8a and 8b

Claims (2)

[Claims] 1. A lightweight cellular concrete panel in which a reinforcing bar mat comprising a main bar and a secondary bar perpendicular to the main bar is embedded so that the main bar extends in the long side direction. A lightweight cellular concrete panel in which a flat anchor member is fixed to a main bar so that its long side is in the direction of the main bar. 2. A method of attaching a lightweight cellular concrete panel to a building body by tapping screws according to claim 1, wherein the tapping screw penetrating a fixture is inserted from the back of the lightweight cellular concrete panel, and the tapping screw is inserted into the anchor member. Screwing the fixed hardware to the lightweight cellular concrete panel, and attaching the fixed hardware to the building skeleton.