JPH0348995Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial field of application] The present invention is an embedded metal fitting (handrail anchor) for installing a balcony handrail unit, more specifically, a balcony handrail unit exclusively for each unit of an RC house. This relates to embedded hardware that is embedded in the balcony side in order to securely support the lower end of the pillar (or mullion) and install it on the balcony (floor support method or mullion method).

[Conventional technology]

Conventionally, standard embedded hardware has been developed for installing handrail units in public hallways (or around shared stairs), and is generally used for installing balcony handrail units.

Figure 5 a and b are the first example, Figure 6 is the second example,
FIG. 7 is a third example.

In Figure 5 a and b, 10 is prefabricated (PC)
Alternatively, a concrete balcony cast on site, 11 is the balcony floor surface, 12 is the border part of the balcony (convex edge before rising), and 13 is formed along the length of the border at the meeting point of the inner wall surface of the border part 12 and the floor surface 11. Reference numeral 14 indicates embedded metal fittings embedded at predetermined intervals along the length of the border portion 12; Reference numeral 15 indicates anchor plates 1 of the embedded metal fittings 14;
This is a border cutout recess that exposes the upper surface of 4a. Reinforcement within the balcony wall thickness is omitted from the diagram.

The balcony handrail unit connects the lower end of each support (or mullion) 16 to the balcony border section 1.
By generally welding and fixing to the exposed upper surface of the anchor plate 14a of each corresponding embedded metal fitting 14 on the second side, or by fixing via a reinforcing connecting material, it is attached to the balcony 10 (border part 12) which is the frame. will be placed. Each border notch recess 15 is then filled with mortar.

The embedded hardware 14 is an anchor plate 14a.
The base of the plate is fixed to the lower surface of the plate via a long nut 14d, and the L is extended toward the floor of the balcony 10.
A pair of left and right floor in-floor anchor bars 14b, 14b, which are bent into a shape and overhang to extend into the thickness of the balcony floor, are also fixed to the lower surface of the plate by welding, and are attached to the left and right sides of the plate, respectively. Anchor transverse reinforcements 14c, 14 in the border portion of the balcony 10, which extend long in the longitudinal direction of the border portion and are rooted within the wall thickness of the border portion, are arranged in front and rear pairs.
It consists of c, 14c, 14c.

The embedded hardware 14 of the second example in FIG. 6 and the third example in FIG.
4b, border inner anchor transverse reinforcement 14c, 14c,
14c, 14c. However, Figure 6 (2nd
In the example), the anchor plate 14a is box-shaped with two open surfaces, the top and front surfaces, and the bases of the left and right internal anchor bars 14b, 14b are connected to the outer surfaces of the left and right side wall plates of the box-shaped anchor plate 14a, respectively. It is welded and fixed. The one in Figure 7 (third example) is the anchor reinforcement 1 in each floor on the left and right sides.
4b and 14b are constructed in a series by bending one reinforcing bar, and the construction base is connected to the anchor plate 14a.
It is welded and fixed to the lower surface of the anchor horizontal reinforcement 14c, 14c, 14c, 14c in each border part.
The middle part of each is folded downward at one end, and then folded back approximately horizontally to form a step-folded form.

The anchor plate 14a is, for example, 100 (mm) x 200
xt9 flat steel plate, -75 x 150 x t9 groove type steel, etc., and each anchor bar 14b, 14c is, for example, D13 (mm).
Reinforcement bar, overhang length (deployed length) is 500 to 800
(mm).

[Problem that the invention attempts to solve]

By the way, as mentioned above, the embedded metal fitting 14 originally has a high strength (rigidity of the unit,
It was developed for installing handrail units in common corridors (or around public stairs) that require a horizontal load of 300 kg/m or more and a vertical load of 300 kg/span or more, and a lower required strength (horizontal load of 150 kg/m or more).
Kg/m or more, vertical load 300Kg/span or more) As a built-in hardware for installing a balcony handrail unit for each unit, the expected load force is large and the strength is excessive, and the expanded length of each anchor reinforcing bar is long. Since the overall structure is large and bulky, it must be assembled at each predetermined position of the balcony frame reinforcement at the same time as the balcony frame reinforcement, which results in poor workability and relatively high cost. There was a problem.

Therefore, it is desired to develop a special type of embedded hardware that is simple and reliable for installing balcony handrail units.

The present invention responds to this need.

B. Structure of the invention [Means for solving the problem] The present invention consists of a flat plate or box type steel anchor plate, a base fixed to the lower surface of the anchor plate to protrude downward, and a lower end of the steel anchor plate. One or more downward anchor steel rods with an overhanging head, at least a thickness of 10 mmφ or more, and a downward protrusion length of 90 mm or more, which are also fixed to the lower surface of the anchor plate and have left and right ends, respectively. Protruding outward from the left and right sides of the anchor plate,
At least the thickness is 10mmφ or more, the overhang length is 50mm
The gist is an embedded hardware for installing a balcony handrail unit, which consists of one or more left and right anchor steel rods with a diameter of mm or more.

[Effect]

The size and shape of the anchor plate may be configured in accordance with conventional standard embedded metal fittings. The downward anchor steel rod and the left and right side anchor steel bars of the embedded hardware of the present invention have significantly smaller overhang dimensions (developed length) than the anchor bars in the floor and horizontal anchor bars in the border of conventional standard embedded hardware, respectively. It is compact. Therefore, after assembling the balcony frame reinforcement, it is possible to arrange the reinforcement at each predetermined position of the assembled reinforcement, and the work efficiency is extremely high. After that, the upper surface of the anchor plate is exposed and buried within the concrete thickness of the balcony border area in the same manner as before, and the column (or mullion) of the balcony handrail unit is fixed to the upper surface of the exposed anchor plate. When installing a handrail unit on a balcony that is a frame structure, in practice,
The handrail unit is stably mounted and supported with sufficient strength to meet the above-mentioned required strength as a balcony handrail unit.

The downward protrusion length of the downward anchor steel rod is generally 90
It is sufficient to set it to 130mm or more, and the overhang length of the left and right anchor steel bars is generally 50mm.
Therefore, it is sufficient to set the distance to 100 mm or less. By providing an overhanging head at the lower end of the downward anchor steel rod, even if the downward projecting length of the downward anchor steel rod is relatively short, the metal object itself buried in the balcony border part can resist rotation against external force. sex is greatly increased.

The thickness of the downward anchor steel rod is 10mm.
φ or less, the downward protrusion length is 90mm or less, there is no overhanging head on the lower end, and the thickness of the left and right anchor steel bars is 10mmφ or less, and the overhang length is 50mm.
A metal fitting designed to be less than 1 mm actually has a low mounting strength when buried in the balcony border portion, and is not suitable as an embedded metal fitting for installing a handrail unit.

〔Example〕

Figures 1 a to d are a front view, top view, left side view, and bottom view of an example of embedded metal fittings according to the handrail unit;
FIG. 2 is a cross-sectional view of the structure embedded in the balcony border.

In the figure, 1 is a flat steel anchor plate measuring 90 (mm) long x 125 mm wide x 9 thick; 2 and 2 are fixed bases to the bottom of the plate and protrude downward; This is a pair of left and right anchor steel bars with 3. In this example, these anchor steel bars 2, 2
5-minute bolts (thickness: 16 mmφ) are used as bolts, and are fixed to the plate 1 by screwing them into screw holes formed in the anchor plate 1 with the bolt tip side as the base, and by welding. The downward projecting length l ₁ of the bolts 2, 2 as the downward anchor steel rods is about 95 mm, and the bolt head at the lower end functions as the projecting head 3. Reference numerals 4 and 4 denote left and right anchor steel rods which are fixed to the lower surface of the anchor plate 1 and whose left and right ends protrude outward from the left and right sides of the anchor plate, respectively. In this example, the thickness is 16mmφ and the length
A single 240 mm steel rod is made to protrude by 57.5 _mm from the left and right ends to the left _and right sides of the anchor plate 1, respectively, and is welded and fixed to the lower surface of the anchor plate 1, thereby creating the above left and right sides. It constitutes the anchor steel rod part. In Fig. 2, 17 indicates the reinforcement within the balcony wall thickness.

The above-mentioned embedded hardware is embedded in the balcony border section 12 as shown in Figure 2.
Fix the pillar 16 of mm, and mortar 18 in the recess 15.
After the mortar has sufficiently hardened, a horizontal load F is applied to the outside of the balcony using an oil jack to the upper end of the support column 16, and the mortar is applied to the floor slab and filled mortar in the area where the hardware is embedded. The maximum load at which cracking (destruction of the embedded part of the hardware) occurs was measured. The result was 300,400Kgf. If one span of handrail unit is 1.8m, it is 150Kg.
The load at f/m corresponds to 270Kgf per column.

FIG. 3 is a perspective view of an example in which the anchor plate 1 is box-shaped. The projecting head 3 at the lower end of the downward anchor steel rod 2 may be shaped like a small disc as shown in FIG. 4a, or may be threaded as shown in FIG. 4b.

C. Effects of the invention In other words, the hardware of the present invention has sufficient strength as a special type of embedded hardware for installing a balcony handrail unit, is small overall, and is easy to handle.
Material costs and manufacturing costs are also significantly lower than conventional standard hardware, making it advantageous in terms of cost.

[Brief explanation of the drawing]

Figures 1a to d are a front view, top view, right side view, and bottom view of an embodiment of the embedded metal fitting of the present invention, Figure 2 is a cross-sectional view of the embedded state, and Figure 3 is an anchor plate. A perspective view of a box-shaped example, FIGS. 4a and 4b are perspective views of modified examples of the protruding head of the lower end of the anchor steel rod, and FIGS. 5 to 7 are configuration diagrams of various conventional standard metal fittings. . 10 is a concrete balcony, 11 is a floor surface,
12 is a border portion, 13 is a drain groove portion, 15 is a notch in the border portion, 16 is a support or mullion of a handrail unit, 17 is a reinforcement within the balcony wall thickness, 18
is the filling mortar for the recess 15.

Claims (1)

[Scope of utility model registration request] A flat plate or box type steel anchor plate 1, a base fixed to the lower surface of the anchor plate and protruding downward, and a protruding head 3 provided at the lower end, with a thickness of at least 10 mmφ or more, protruding downward. One or more downward anchor steel rods 2 with a length of 90 mm or more, which are also fixed to the lower surface of the anchor plate and whose left and right ends extend outward from the left and right sides of the anchor plate, respectively. One or more left and right anchor steel rods 4 with a thickness of at least 10 mmφ and an overhang length of 50 mm or more are provided.
Embedded hardware for installing balcony handrail units consisting of and.