JP2582276Y2 - Flat deck - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat deck used for constructing a concrete slab, and more particularly to a flat deck capable of freely holding reinforcing bars vertically and horizontally.

[0002]

2. Description of the Related Art As shown in FIG. 11, a plurality of hollow triangular ribs 1 are provided in parallel on a lower surface of a flat deck used for constructing a concrete slab at regular intervals, and front and rear ends are crushed. There is a flat deck 4 provided with a flat portion 2 for mounting on a beam and a connecting portion 3 which is bent at one side end downward.

The flat deck 4 has flat portions 2 at both ends.
As shown in FIG. 12, the beam is placed between the beams 5 or between the concrete beams (not shown), and the reinforcing steel 6 is placed above the flat deck 4.
(The upper reinforcing bar 6 is omitted in the figure), and a slab concrete 7 is cast on the flat deck 4 to construct a concrete slab 8. In order to attach a hanger bolt for suspending a ceiling or the like to the concrete slab 8 constructed in this manner, the dovetail groove 1 as shown in FIG.
2 is fitted and locked in the dovetail groove 12, and
The hanger bolt 11 is attached to the threaded pipe 14 on the lower surface of No. 3.

However, since the strength of the adhesive force between the upper surface of the flat deck 4 in contact with the slab concrete 7 of the hollow triangular ribs 1 and the slab concrete 7 is weak, the hollow triangular ribs 1 are subjected to a large hanging load on the hanger bolt 11 or the like. The ribs 1 are pulled down, the flat deck 4 peels off from the slab concrete 7, and the suspension position such as the ceiling is lowered in the case of a steel structure, and the ceiling falls in the case of the RC structure. For this reason, the flat deck 4
The applicant has proposed a flat deck anchor / reinforcement spacer capable of preventing the slab concrete 7 from peeling off from the slab concrete 7 (Japanese Utility Model Application No. 4-1699).
No. 2).

As shown in FIG. 14, a flat deck 4 having a plurality of hollow triangular ribs 1 on its lower surface in parallel at regular intervals as shown in FIG.
In the upper surface at both sides of the hollow triangular rib 1, a plurality of sets of four lateral holes 15 symmetrically parallel to the ribs 1 are provided at appropriate intervals. An anchor / rebar spacer 19 in which two arc-shaped elastic wires 17 each having a horizontal portion 16 are opposed to each other at a predetermined interval and both ends of a linear wire 18 are welded to the arc-shaped tops. The horizontal portion 16 of the wire 18 is inserted and locked, and is held on the upper surface of the flat deck 4.

The anchor / rebar spacer 19 of the flat deck 4 has the following problems. Since there is a direction in the mounting direction of the spacer 19 that receives the reinforcing bar, there is a case where the reinforcing bar that enters vertically and horizontally does not rest on the spacer 19. When the flat deck 4 is transported in a stack, the upper surfaces of the flat decks 4 are usually aligned with each other in order to reduce the stacking amount. Therefore, the projections forming the lateral holes 15 may be crushed. To avoid this, the stack height must be increased. As a result, the transportation cost may be increased, and the lower surface of the flat deck 4 stacked by the projection may be damaged. When a bar arrangement worker gets caught on a leg, it may come off and may injure the reinforcement operator. The thickness of the flat deck 4 is 0.8 mm to 1.2 mm
When the load applied to the hanger bolt 11 attached to the hollow triangular rib 1 becomes excessive as shown in FIG. 13, the protrusion of the lateral hole 15 is broken and the flat deck 4 is separated from the slab concrete 7. Sometimes.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention can solve all of the above problems, and also facilitates the work of mounting the anchor / rebar spacer and easily drills the mounting hole of the anchor / rebar spacer. Even if the main rebar that bears the stress generated in the slab in one slab surrounded by the girder is installed in either direction parallel to the rib direction of the flat deck or at right angles to the rib direction The aim is to provide a flat deck that can be arranged without any hindrance.

[0008]

The flat deck of the present invention for solving the above-mentioned problems has a hollow triangle or L on the lower surface.
In a flat deck having a plurality of parallel or inverted T-shaped ribs at regular intervals, a set of four holes at regular intervals in the front, rear, left and right directions near the ribs are formed on the upper surface between the ribs. A wire rod having substantially the same length as the gap between the holes, having a plurality of sets of holes, having a convex portion at the center, a symmetrically loosely inclined downwardly on both sides, and a locking portion bent inward and downward at both ends. 2
The books are opposed to each other at the same interval as the hole, and the both ends of the linear wire are welded to the center of the upper side of the convex portion at both ends thereof. A large number of rebar spacers serving as anchors are arranged and held on the upper surface of the deck.

[0009]

The flat deck according to the present invention constructed as described above is placed between beams, and the reinforcing bars are placed and arranged on the anchor / reinforcement spacers arranged and arranged on the upper surface, and the slab is placed on the flat deck. Cast concrete to build a concrete slab.

In the construction of this concrete slab, even if the main reinforcing bar placed and arranged on the anchor / rebar spacer is arranged in the rib direction of the flat deck or in a direction perpendicular to the rib, the main reinforcing bar is preceded in the rib direction. When arranging rebars in the direction perpendicular to the ribs, place the anchor / rebar spacer on the flat deck so that the straight wire above the anchor / rebar spacer is positioned at right angles to the ribs on the flat deck. The main reinforcement in the direction of the ribs can be placed and arranged on the upper straight wire by holding the arrangement of the main reinforcements, or when the main reinforcement is arranged only in the direction perpendicular to the ribs of the flat deck or When arranging the main rebar first in the direction perpendicular to the direction of the rib, and then arranging the reinforcement in the rib direction, the straight wire above the anchor / reinforcement spacer will be By arranging holding the anchor shared rebar spacer so as to be positioned in a direction flat deck, it is possible to place and route muscle mounting the main reinforcement in the direction of the ribs perpendicular to the top of the wire at the top of the straight line. In other words, in the flat deck of the present invention, the front, rear, left and right intervals of a set of four holes for holding the anchor / rebar spacer are equal,
Since the anchor / rebar spacers can be arranged and held in either the rib direction of the flat deck or the direction perpendicular to the ribs, the reinforcing bars entering the vertical and horizontal directions can be securely placed.

After the concrete slab is constructed by casting slab concrete on the flat deck as described above, hanger bolts are attached to the ribs on the lower surface of the flat deck. Even when a load is applied, the rib is integrated with the concrete slab via the anchor / rebar spacer, and the rib is applied to the rib by the locking portion of the anchor / rebar spacer inserted into a set of four holes of the flat deck. The load is reliably transferred to the concrete slab, so that the flat deck does not separate from the slab concrete.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the flat deck of the present invention will be described with reference to the drawings. As shown in FIG. 1, a plurality of hollow triangular ribs 1 are provided on a lower surface at regular intervals, in this embodiment, three ribs are provided in parallel.
In a flat deck 4 provided with a flat portion 2 for crushing the front and rear ends and mounting the beam on a beam, and a connecting portion 3 which is bent downward at one side end, between the hollow triangular ribs 1 and 1 At the position near the rib 1, substantially on the bottom plate 1 of the rib 1
a set of four holes 20 at a slightly outer position of a at equal intervals in the front-rear and left-right directions (interval of 170 mm when the pitch of the ribs 1 is 210 mm in this example), and one set of holes 20 based on the center of the four holes.
A plurality of sets of holes 20 are provided in the longitudinal direction at intervals of 70 mm, and the anchor / reinforcement spacers 21 are arranged and held in the plurality of sets of holes 20 as shown in FIG. That is, as shown in FIG. 3 and FIG.
Two wire rods 24 having substantially the same length as the interval between the set of four holes 20 having a locking portion 23 which is symmetrically loosely inclined downward on both sides, and which is bent inward and downward at both ends. It is formed by welding both sides of a straight wire 25 to the center of the upper side of the projection 22 at the same interval as the interval of the hole 20,
The locking portions 23 at both ends of the wire 24 are
The elastic force of the wire 24 is used to resiliently insert and lock
A large number are arranged and held on the upper surface between the hollow triangular ribs 1 and 1 of the flat deck 4.

As shown in FIG. 5, the flat deck of the present invention constructed as described above has flat portions 2 at both front and rear ends between beams 5.
The reinforcing bars 6 (the upper-layer reinforcing bars 6 are omitted in the figure) are placed and arranged on the anchor / rebar spacers 21 that are arrayed and held on the upper surface, and the slab is placed on the flat deck 4. Concrete 7 is cast and a concrete slab 8 is constructed.

In constructing this concrete slab 8,
Even if the main rebar 6 placed and arranged on the anchor / rebar spacer 21 is arranged in the rib direction (front-back direction) of the flat deck 4 or in the direction perpendicular to the rib (left-right direction), the main rebar is placed first in the rib direction. In the case where the reinforcing bars 6 are arranged and then the reinforcing bars are arranged in a direction perpendicular to the ribs,
The anchor and rebar spacers 21 are arranged and held on the flat deck 4 so that the upper straight wire 25 is positioned at right angles to the ribs of the flat deck 4 as shown in FIG. The main reinforcing bar 6 in the rib direction can be placed and arranged on the top 25, and when the reinforcing bar 6 is arranged only in the direction perpendicular to the rib of the flat deck 4, or the main reinforcing bar is placed first in the direction perpendicular to the rib. In the case of arranging the reinforcing bars 6 in the rib direction afterward, the anchor and reinforcing bars are arranged such that the straight wire 25 on the upper portion of the anchor / rebar spacer 21 is located in the rib direction of the flat deck 4 as shown in FIG. By arranging and holding the spacers 21 on the flat deck 4, the main rebar 6 in a direction perpendicular to the ribs can be placed and arranged on the upper linear wire 25. In other words, in the flat deck according to the present invention, the front-rear and left-right intervals of the set of four holes 20 for holding the anchor / rebar spacers 21 are equal. Since the arrangement can be maintained in any direction of the right angle, the main reinforcing bars 6 entering the vertical and horizontal directions can be reliably placed.

However, as described above, the slab concrete 7 is cast on the flat deck 4 and the concrete slab 8
After fitting, a metal fitting 13 having a dovetail groove 12 is fitted and locked into the hollow triangular rib 1 on the lower surface of the flat deck 4 with the dovetail groove 12 as shown in FIG.
Attach the hanger bolt 11 of this
When a ceiling or the like (not shown) is hung on the hanger bolt 1
Even when a load is applied to the slab concrete 1, the hollow triangular rib 1 can be connected to the slab concrete 7 via the anchor / rebar spacer 21.
And a set of four holes 2 in the flat deck 4
The load applied to the rib 1 by the locking portion 23 of the anchor / reinforcement spacer 21 inserted at 0 is reliably transmitted to the concrete slab 8, so that the hollow triangular rib 1 is not pulled down, and the flat deck 4 does not peel off from the slab concrete 7 and the hanging position such as the ceiling does not drop.

In the above embodiment, the set of four holes 20 for arranging and holding the anchor / rebar spacers 21 of the flat deck 4 is circular. However, even if the knock holes 20a as shown in FIG. Cross slit hole 20 as shown in
b may be used. Further, the locking portion 23 of the anchor / rebar spacer 21 may be configured such that a portion engaging with the hole 20 of the flat deck 4 is flattened as shown in FIG.

[0017]

[Effect of the invention] As described above, the flat deck of the invention is
Since a set of four holes for holding the anchor / reinforcement spacer is equal in front, rear, left and right, the anchor / reinforcement spacer can be arranged and held in either the rib direction of the flat deck or the direction perpendicular to the rib. Therefore, rebars that enter vertically and horizontally can be reliably placed.

Also, after slab concrete is cast on the flat deck of the present invention to construct a concrete slab,
Even when a hanger bolt is attached to the rib on the lower surface of the flat deck and the ceiling or the like is hung, even if a load is applied to the hanger bolt, the rib is integrated with the slab concrete via the anchor / rebar spacer. The load on the ribs is reliably transmitted to the concrete slab by the locking portion of the anchor / spacer inserted into the pair of holes, so that the flat deck does not separate from the slab concrete. Further, the flat deck of the present invention is completely flat when the anchor / rebar spacer is removed, so that the flat deck does not become bulky and is not damaged when being stacked and transported.

Further, at the time of construction, the anchor / reinforcement spacer can be easily retained in the set of four flat decks by resiliently inserting and locking the holes using a resilient force.
The mounting work is easy, and the anchor / rebar spacer once attached does not come off even if the reinforcing arm operator catches his / her foot, and does not hurt the reinforcing arm worker.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a flat deck before a large number of anchor / rebar spacers are arranged and held.

FIG. 2 is a perspective view showing the flat deck according to the present invention in which a large number of anchor / rebar spacers are arranged and held.

FIG. 3 is an enlarged plan view of a portion A in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 shows a state in which a concrete deck is constructed by placing the flat deck of FIG. 2 between beams, placing reinforcing bars on an anchor / rebar spacer on the upper surface thereof, and placing slab concrete. It is a fragmentary perspective view.

FIG. 6 is a perspective view showing another example of the flat deck of the present invention in which a large number of anchor / reinforcement spacers in the flat deck of FIG.

FIG. 7 is a longitudinal sectional view showing a state in which a metal fitting is fitted and locked to a hollow triangular rib on the lower surface of the flat deck of FIG. 5 and a hanger bolt is attached thereto.

FIG. 8 is a view showing another example of a hole for holding an anchor / rebar spacer.

FIG. 9 is a view showing another example of a hole for holding an anchor / rebar spacer.

FIG. 10 is a diagram showing an example of a change in the shape of the locking portion of the anchor / rebar spacer.

FIG. 11 is a perspective view showing a conventional flat deck.

12 is a partially cutaway perspective view showing a state in which a concrete deck is constructed by placing the flat deck of FIG. 11 between beams, arranging a reinforcing bar above the beams, and pouring slab concrete.

FIG. 13 is a view showing a conventional method of attaching a hanger bolt to the concrete slab of FIG.

FIG. 14: A conventional anchor / reinforcement spacer is mounted on the upper surface of a normal flat deck, this flat deck is mounted between beams, reinforcing bars are arranged above the flat deck, and slab concrete is cast to construct a concrete slab. It is a partially broken perspective view showing the state where it was done.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rib 4 Flat deck 20 hole 21 Reinforcement spacer serving also as anchor 22 Convex part 23 Locking part 24 Wire 25 Straight wire

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-164853 (JP, A) JP-A-63-280104 (JP, A) Jikken Sho 54-1302 (JP, Y2) (58) Field (Int.Cl. ⁶ , DB name) E04B 5/40 E04C 5/18 104

Claims (1)

(57) [Scope of request for utility model registration] 1. A flat deck having a plurality of ribs arranged in parallel on a lower surface thereof at regular intervals, and a set of four holes which are equally spaced in front, rear, left and right at positions near the ribs are formed on the upper surface between the ribs.
A large number of sets are provided at regular intervals, and the set of holes has a convex portion at the center, and both sides are symmetrically and gently inclined downwardly downward, and have locking portions bent inward and downward at both ends. The two long wires are opposed to each other at the same interval as the hole, and both ends of the linear wire are welded to the center of the upper side of the convex portion. A flat deck characterized by having a large number of reinforcing and reinforcing steel spacers arranged on the upper surface of the flat deck.