JP6738709B2 - Outer frame for evacuation hatch - Google Patents

Description

The present invention relates to an outer frame of an evacuation hatch installed on a flat beam portion of a building or the like.

Balconies using flat beams may be installed in condominiums and other condominiums. On the balcony, an evacuation hatch that can evacuate from the upper floor to the lower floor is installed in order to secure an evacuation route that is separate from the aisle in case of an emergency such as a fire.
The evacuation hatch has an outer frame having upper and lower openings, evacuation equipment such as evacuation ladders installed in the outer frame, and an upper lid and a lower lid for closing the upper and lower openings of the outer frame in a normal state ( See Patent Documents 1 and 2).
The evacuation hatch is fixed by being embedded in concrete by setting the outer frame at a predetermined position and then pouring concrete into the surrounding area. That is, the outer frame also has a function as a mold for forming the opening of the evacuation hatch.

The outer frame of the evacuation hatch is generally in the shape of a rectangular prism. When concrete is poured and buried on the outer side of the outer frame, cracks extending from the outer frame corner are likely to occur in the concrete near the outer frame corner due to drying shrinkage. When cracks occur, the width of the cracks may widen due to an earthquake or other shaking, which causes corrosion of the reinforcing bars and water leakage to the lower floors.

In order to prevent cracks from occurring at the corners of the outer frame, opening reinforcing bars extending in a direction substantially orthogonal to the diagonal line of the opening may be arranged near the corners of the outer frame. FIG. 4 shows a schematic view of an outer frame 300 having a conventional quadrangular prism shape and an opening reinforcing bar 330 provided in the vicinity of a corner of the outer frame 300 when viewed from above. In the vicinity of the outer frame, main bars and stirrup bars for composing the flat beam are complicatedly arranged, but are omitted in FIG.
Since the reinforcement of the opening reinforcing bar 330 is performed after finishing the reinforcement of the reinforcing bars constituting the flat beam and setting the outer frame 300 at a predetermined position, the space for passing the opening reinforcing bar 330 and the existing reinforcing bar are There are problems such as interference and poor workability because the work is performed in a narrow space between the existing reinforcing bars. Before placing concrete, it is necessary for the site supervisor to visually check whether the reinforcing bars are arranged according to the standard. However, the opening reinforcing bars 330 are arranged according to the standard at the four corners of all the evacuation hatches to be installed. It is very complicated to make sure that they are streaked.

JP-A-9-122262 Japanese Patent Laid-Open No. 10-127796

It is an object to provide an outer frame for an evacuation hatch that is easy to construct and is unlikely to crack.

1. An evacuation hatch outer frame, comprising: a substantially square pole-shaped main body having chamfered portions at four corners; and extension portions extending upward from the chamfered portions.
2. 1. A reinforcing bar extending outwardly from the chamfered portion and a crack preventing bar connected to the reinforcing bar and extending in a horizontal direction substantially parallel to the chamfered portion. The outer frame for the evacuation hatch described in.
3. 1. The reinforcing bar is provided in a plurality of steps in the vertical direction, and the crack preventing bar is connected to each step of the reinforcing bar. The outer frame for the evacuation hatch described in.
4. After setting the evacuation hatch outer frame having a substantially quadrangular prism-shaped main body having chamfered portions at the four corners and an extended portion extended upward from the chamfered portion to a predetermined position,
Arrangement around the outer frame for the evacuation hatch,
A method for constructing an evacuation hatch outer frame, which comprises placing concrete and burying the evacuation hatch outer frame in concrete.

The evacuation hatch outer frame of the present invention has a substantially quadrangular prism-shaped main body having chamfered portions at four corners. Since the four corners of the main body are chamfered, cracks in concrete are less likely to occur due to stress concentration near the corners.
By providing the extension portion wider than the lower chamfered portion, it is possible to prevent the extension portion from falling inward or outward due to a shock or the like. Further, the extension portion can be further reinforced by connecting the extension portion with the support member.
By having an inwardly extending edge portion at the edge of the upper opening of the outer frame, the rigidity of the entire main body is increased, and it is possible to prevent deformation during concrete pouring.

By providing a reinforcing bar extending outward from the chamfer and a crack preventing bar that is connected to the reinforcing bar and extends substantially parallel to the chamfer in the horizontal direction, the occurrence of cracks can be further suppressed.
The evacuation hatch outer frame is buried in concrete and is used to escape from the upper floor to the lower floor in an emergency.However, by providing reinforcing bars in multiple stages in the vertical direction, It is possible to prevent the occurrence of cracks in both.

In the state where the evacuation hatch outer frame of the present invention is set in advance in advance, by arranging the main bars, stirrup bars, and the like constituting the flat beam, the evacuation hatch outer frame is arranged so as not to interfere with it. It's easy to do.
Further, when the evacuation hatch outer frame provided with the reinforcing bar and the crack preventing bar is used, the opening reinforcing bar is not required, so that the construction can be simplified and shortened. In this case, since the crack preventing bar is surely arranged at a predetermined position, it is easy to confirm the bar arrangement before placing concrete.

The figure which shows 1st embodiment of the outer frame for evacuation hatches of this invention. The figure which shows the state which installed the evacuation implement in the outer frame for evacuation hatches which is the 1st embodiment of this invention. The figure which shows 2nd embodiment of the outer frame for evacuation hatches of this invention. FIG. 8 is a schematic view of a conventional rectangular outer frame and an opening reinforcing bar provided near a corner of the outer frame as viewed from above.

The present invention relates to an evacuation hatch outer frame that also has a function as a formwork when constructing an opening of an evacuation hatch.
FIG. 1 shows a first embodiment of the evacuation hatch outer frame of the present invention.
The evacuation hatch outer frame 100 according to the first embodiment has a substantially quadrangular prism-shaped main body 110 having chamfered portions 120 at four corners, and the main body 110 has an opening inside. The peripheral edge of the upper surface of the opening is bent inward to form a lip 140. The chamfered portions 120 at the four corners of the main body have extension portions 121 extending upward from the upper surface of the opening, and the extension portions 121 are connected by the support members 150 at the two opposite sides of the main body 110 having a substantially rectangular prism shape. ..

The main body 110 has an opening for a person to pass through the inside of the main body and evacuate in an emergency. In Japan, the size of the opening is stipulated by the Fire Service Agency Notification No. 2 (technical details regarding the installation and maintenance of evacuation equipment) dated April 16, 1996. In the case of a ladder, it is specified that a circle with a diameter of 0.5 meters or more can be inscribed. In the outer frame for the evacuation hatch of the present invention, the evacuation equipment is installed by fitting it into the opening. When a general evacuation ladder is installed as an evacuation tool, the size of the main body 110 needs to be about 0.6 m square in order to secure the size of the opening. The height of the main body 110 is appropriately designed according to the thickness of the flat beam or the like on which the evacuation hatch is installed.
Examples of the material for forming the main body 110 include stainless steel, hot-dip galvanized steel sheet, and the like. A mere steel plate is not preferable because rust may occur after construction.

Chamfers 120 are formed at the four corners of the main body 110, and the chamfers 120 have extension parts 121 that extend upward. In the evacuation hatch outer frame 100 according to the first embodiment, since the four corners of the main body 110 are chamfered to form the chamfered portion 120, the stress concentrated on the corner when embedded in concrete is small, and It is possible to prevent cracking due to drying shrinkage. The width of the chamfered portion 120 is preferably 8 cm or more in order to prevent concentration of stress.

It is preferable that the extension portion 121 is provided wider than the lower chamfered portion 120, that is, over a part of the surfaces on both sides of the chamfered portion 120. By providing the extension 121 wider than the chamfer 120 below, it is possible to prevent the extension 121 from falling inward or outward due to a shock or the like. The length of the extension 121 is designed so that the upper side of the extension 121 does not protrude from the concrete when an evacuation tool is installed on the opening of the main body 110 and concrete is placed. The extension part 121 is connected by a support member 150 on two opposite sides of the main body 110 having a substantially quadrangular prism shape. The support member 150 supports an evacuation device and reinforces the extension part 121 as described later. Have the function to
A rim 140 is formed around the upper surface of the opening. The rim portion 140 increases the rigidity of the main body 110, and also has a role as a lid that prevents concrete from flowing into the opening portion during pouring.

Reinforcing bars 130a and 130b extending outward are fixed to the outer surface of the chamfered portion 120. In the evacuation hatch outer frame 100 according to the first embodiment, the reinforcing bars 130a and 130b are L-shaped, and one side thereof is fixed to the chamfered portion 120 by welding or the like.
The evacuation hatch outer frame 100 according to the first embodiment is provided with the reinforcing bars 130a and 130b extending outward from the chamfered portion 120 to restrain the concrete that hardens in the vicinity of the chamfered portion 120 and in the vicinity of the corner portion. The concrete strength can be increased.

A crack prevention line 160 extending horizontally parallel to the chamfered portion 120 is connected to the reinforcing lines 130a and 130b by welding or the like so as to straddle the two reinforcing lines 130a and 130b. In the evacuation hatch outer frame 100 according to the first embodiment, the connection work between the crack prevention reinforcement 160 and the reinforcement reinforcements 130a, 130b is performed with the crack prevention reinforcement 160 placed on the two reinforcement reinforcements 130a, 130b. Since it can be performed, it is easy to align the crack prevention line 160. In the evacuation hatch outer frame 100 according to the first embodiment, the crack prevention streak 160 is fixed at a position which is about 5 cm below the concrete upper surface at the time of installation. The crack prevention streak 160 is fixed at a position below the concrete top surface by 3 cm or more, and is usually fixed at a position above the concrete top surface between 3 cm and 10 cm.
The crack preventing bar 160 corresponds to the opening reinforcing bar 330 in the conventional example shown in FIG. The evacuation hatch outer frame 100 of the present invention has the effect of preventing the occurrence of concrete cracks by having the chamfered portion 120, but by providing the crack preventing bar 160, it is possible to further suppress the occurrence of cracks. it can.

FIG. 2 shows a state in which the evacuation equipment is installed on the evacuation hatch outer frame 100 according to the first embodiment. The evacuation equipment has a quadrangular prism-shaped housing 400, and an evacuation ladder or the like (not shown) is housed inside. The housing 400 has a blade member on its side surface. The evacuation equipment is installed in the evacuation hatch outer frame 100 at a predetermined height position by fitting the housing 400 into the opening and locking the blade member to the support member 150.

Hereinafter, a method of constructing a flat beam using the evacuation hatch outer frame 100 according to the first embodiment will be described. The outer frame for the evacuation hatch of the present invention can be provided not only on the flat beam but also on the floor surface of the reinforced concrete structure.
First, a formwork for forming the flat beam portion on which the escape hatch is installed is installed, and the outer frame 100 for the escape hatch according to the first embodiment is set at a predetermined position in the formwork. Next, the reinforcing bars such as the main bars and the stirrup bars constituting the flat beam are arranged.
The evacuation hatch outer frame 100 according to the first embodiment includes reinforcement bars 130a and 130b and a crack prevention bar 160, and by arranging the evacuation hatch outer frame 100 with the evacuation hatch outer frame 100 set in advance. It is easy to arrange the reinforcing bars constituting the flat beams without interfering with the reinforcing bars 130 and the crack preventing bars 160. In addition, since the reinforcement reinforcement 160 is not required because the crack prevention bar 160 is provided, the reinforcing work can be simplified and the checking work of the reinforcing bar before placing concrete can be facilitated.

The housing 400 that houses the evacuation equipment is fitted into the opening and supported by the support member 150, so that the housing 400 is installed on the evacuation hatch outer frame 100. At this time, by adjusting the blade member and the support member 150, or by arranging a so-called getter between the blade member and the support member 150, the housing 400 is adjusted to a predetermined height position. can do. The housing 400 may be installed before the work of arranging the reinforcing bars forming the flat beam.

Concrete is placed in a form forming a flat beam, and the evacuation hatch outer frame 100 and the housing 400 are embedded and fixed with concrete. Placing of concrete can be performed by a known method. A flat beam is constructed by hardening the concrete. Moreover, caulking is performed between the concrete and the housing 400 as needed.

FIG. 3 shows a second embodiment of the evacuation hatch outer frame of the present invention. In FIG. 3, the same members as those in FIG. 1 are designated by the same reference numerals.
The evacuation hatch outer frame 200 according to the second embodiment shown in FIG. 3 has upper reinforcing bars 231a and 231b and lower reinforcing bars 232a and 232b, and upper crack preventing bars 261 are provided on the upper reinforcing bars 231a and 231b. The lower crack preventing reinforcement 262 is connected to the lower reinforcing reinforcements 232a, 232b. The upper reinforcing bar 231 and the lower reinforcing bar 232 are both end sides of the U-shaped rebar, and the central side is fixed to the chamfered portion by welding or the like.
In the evacuation hatch outer frame 200 which is the second embodiment, the upper crack prevention bar 261 is located about 5 cm below the concrete top surface during installation, and the lower crack prevention bar 262 is located about 5 cm above the concrete bottom surface during installation. It is fixed at the position. The upper crack-preventing streak 261 and the lower crack-preventing streak 262 are respectively fixed at positions inward of 3 cm or more from the concrete interface, and usually in positions of 3 cm to 10 cm inward from the concrete interface.
Since the evacuation hatch outer frame 200 according to the second embodiment has the lower crack preventing streaks 262, it is possible to prevent the occurrence of cracks on the lower surface of the concrete.

The evacuation hatch outer frame shown in FIGS. 1 and 3 is an example, and the evacuation hatch outer frame of the present invention is not limited thereto. For example, the reinforcing bars can be installed in the horizontal direction in one or more and four or less, and in the vertical direction in one or more and five or less steps. When a plurality of reinforcing bars are provided in the vertical direction, crack preventing bars are provided at each step. It is also possible to fix the U-shaped rebar to the chamfered part so that the central side is in the horizontal direction, and use both end sides as reinforcing bars. By fixing the U-shaped rebar so that the central side is horizontal, it is easy to install the reinforcing bars in multiple stages in the vertical direction.

100 Evacuation hatch outer frame 110 according to the first embodiment 110 Main body 120 Chamfering part 121 Extension part 130 Reinforcing bar 140 Edge part 150 Supporting member 160 Crack preventing bar 400 Evacuator housing

200 Evacuation Hatch Outer Frame 231 According to Second Embodiment Upper Reinforcing Bar 232 Lower Reinforcing Bar 261 Upper Crack Preventing Bar 262 Lower Crack Preventing Bar

300 Outer frame 330 Opening reinforcement

Claims (4)

An evacuation hatch outer frame having a substantially square pole-shaped main body having chamfered portions at four corners, and extension portions extending upward from the chamfered portions. The evacuation hatch according to claim 1, further comprising a reinforcing bar extending outward from the chamfered part and a crack preventing bar connected to the reinforcing bar and extending in a horizontal direction substantially parallel to the chamfered part. Outer frame. The outer frame for an evacuation hatch according to claim 2, wherein the reinforcing bar is provided in a plurality of steps in the vertical direction, and the crack preventing bar is connected to each step of the reinforcing bar. After setting the evacuation hatch outer frame having a substantially quadrangular prism-shaped main body having chamfered portions at the four corners and an extended portion extended upward from the chamfered portion to a predetermined position,
Arrangement around the outer frame for the evacuation hatch,
A method for constructing an evacuation hatch outer frame, which comprises placing concrete and burying the evacuation hatch outer frame in concrete.

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