JP5921378B2 - Steel deck unit - Google Patents

Description

  The present invention relates to a steel deck unit, and more particularly to a steel deck unit having a deck plate and a reinforcing bar truss.

Conventionally, a concrete slab is obtained by placing concrete on a steel plate deck plate, and reinforcing bars for reinforcement or stiffening are disposed in the concrete. That is, the concrete slab is installed between one beam and the other beam of the structure, and the direction from one beam to the other beam is called “span direction”. A ridge-shaped portion in the span direction and a valley-shaped portion (groove-shaped portion) in the span direction are alternately formed in a direction perpendicular to the span direction, and a substantially U-shaped waveform with the bottom of the valley-shaped portion narrowed. On the other hand, the reinforcing bars are arranged in the valley portion in parallel with the span direction.
For the purpose of facilitating the arrangement of the reinforcing bars, a reinforcing bar arrangement body in which the reinforcing bars are fixed at a predetermined position is provided, a support portion is formed at the lower end of the reinforcing bar arrangement body, and the support portion is attached to the deck plate. An invention has been disclosed in which a reinforcing bar-arranged body is laid after being locked to a recess formed in a valley-shaped portion (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-42432 (page 4-6, FIG. 1)

In the device disclosed in Patent Document 1, the deck plate is such that the top surface of the mountain-shaped portion and the bottom surface of the valley-shaped portion are parallel (exactly, the flat surfaces except the uneven portions of each surface are parallel). In the inclined surface connecting the top surface of the mountain and the bottom surface of the valley, a recess in the span direction is formed at a position close to the bottom surface of the valley. In addition, the main bar arrangement body (rebar arrangement body) is configured such that each upper end of each of the pair of lattice-shaped bent reinforcing bars is joined to the upper end bar of each of the pair of lattice-shaped bent reinforcing bars (folded zigzag). After the lower end bars are arranged in the lower part, all the lower ends of each of the lattice-shaped bending reinforcing bars are bent away from each other to form a support part.
And since the tips of all the support parts are locked to the concave stripes, for example, when a deck is exposed to a high temperature due to a fire or the like, the heat of the deck plate passes through the support parts to the lattice. It is easily transmitted to the curved bending rebar, lower end rebar and upper chord. For this reason, there existed a problem that there existed a possibility that the intensity | strength of a main muscle arrangement body may fall.

  The present invention solves the above-mentioned problem, and suppresses transmission of the heat of the deck plate to the lattice-shaped bent reinforcing bar, the lower bar and the upper bar even when the deck plate is exposed to a high temperature, and the main bar arrangement body It aims at providing the steel deck unit which can prevent the fall of the intensity | strength of.

The steel deck unit according to the present invention is a steel deck unit in which end portions in the longitudinal direction are respectively installed on one beam and the other beam forming a structure,
A deck plate formed of a bent steel plate, a mounting jig installed on the deck plate, and a reinforcing bar truss mounted on the mounting jig,
The deck plate is a wavy cross section having a peak surface, a valley bottom surface parallel to the peak surface, and an inclined surface connecting the peak surface and the valley bottom surface, and the valley bottom surface of the inclined surface. A ridge formed in parallel with the bottom surface of the valley at a position close to the groove, and a groove formed between the ridge and the bottom surface of the valley,
The rebar truss includes a pair of lattice materials that are bent in a substantially sawtooth shape, an upper chord material (corresponding to “upper end bars”) to which the upper ends of the pair of lattice materials are joined, and the pair of A pair of lower chord members (corresponding to “lower end bars”) to which the lower ends of the lattice materials are joined,
The mounting jig includes a pair of jig body portions formed with a pair of jig notches to be engaged with the pair of lower chord members, and a pair of protrusions formed in the lower ends of the jig body portions and protruding away from each other. Jig legs, and
The front ends of the pair of jig legs of the attachment jig respectively enter a pair of opposed concave grooves of the deck plate, and the pair of jigs are formed by the pair of concave grooves. The legs are gripped in a direction approaching each other,
The distance between the mounting jigs in the longitudinal direction is wider than the distance in the longitudinal direction between the lower ends of the lattice material.

The steel deck unit according to the present invention has the following effects.
That is, since the reinforcing bar truss is installed on the deck plate via the mounting jig, the reinforcing bar truss (the lower end of the lattice material) does not directly contact the deck plate. In addition, since the mounting jig is installed on the deck plate with a distance larger than the longitudinal distance between the lower ends of the lattice material, the number of contact points between the mounting jig and the deck plate is the lower end of the lattice material. Compared to the number of contact points between the lower end of the lattice material and the deck plate when the is installed directly on the deck plate. Therefore, the heat transfer from the deck plate to the rebar truss is hindered, so even when the deck plate is exposed to high temperatures, the heat of the deck plate is not easily transferred to the lattice material and the upper chord material. Can be maintained.

The front view which shows the whole steel deck unit which concerns on Embodiment 1 of this invention. The top view which shows the whole steel deck unit shown in FIG. The side view which shows the whole steel deck unit shown in FIG. The front view which shows a part (deck plate) of the steel deck units shown in FIG. The front view and side view which show a part (rebar truss) of the steel deck units shown in FIG. The top view, sectional drawing (AA cross section), sectional drawing (BB cross section), and side view which show a part (attachment jig) of the steel deck unit shown in FIG. The top view which shows the installation point to the deck plate of the attachment jig in the steel deck unit shown in FIG. The perspective view which shows the attachment point to the attachment jig of the reinforcing bar truss in the steel deck unit shown in FIG.

[Embodiment 1: Steel deck unit]
1 to 8 illustrate a steel deck unit according to Embodiment 1 of the present invention. FIG. 1 is a front view showing the whole, FIG. 2 is a plan view showing the whole, and FIG. 3 is a side view. 4 is a front view showing a part (deck plate), FIG. 5 (a) is a front view showing a part (rebar truss), and FIG. 5 (b) is a side view showing a part (rebar truss). 6, (a), (b), (c), and (d) are a plan view, a cross-sectional view (cross section AA in FIG. 6 (a)), a cross-sectional view showing a part (attachment jig) (B-B cross section in (a) of FIG. 6) and side view, FIGS. 7 (a) and (b) are plan views showing the installation procedure of the mounting jig to the deck plate, and FIG. It is a perspective view which shows the attachment point to a tool.
Each figure is shown schematically and has an exaggerated portion.

(Steel deck unit)
1 to 3, a steel deck unit 100 has unit ends 101 and 102 in the longitudinal direction (same in the span direction) on one beam 91 and the other beam 92 forming a structure (not shown). Each is installed. The steel deck unit 100 includes a deck plate 10 formed of a bent sheet metal, an attachment jig 20 installed on the deck plate 10, and a reinforcing bar truss 30 attached to the attachment jig 20. ing.
The reinforcing bar truss 30 is disposed in a range away from the longitudinal ends 11 and 12 of the deck plate 10, and the length of the reinforcing bar truss 30 is shorter than the length of the deck plate 10. However, the length (T) of the reinforcing bar truss 30 may be the same as the length of the deck plate 10.

(Deck plate)
In FIG. 4, the deck plate 10 includes a crest surface 13a, 13b (located in the same plane) and a trough bottom surface 14a, 14b, 14c parallel to the crest surface 13a, 13b formed in the span direction. An inclined surface 15a connecting the mountain top surface 13a and the valley bottom surface 14a, an inclined surface 15b connecting the mountain top surface 13a and the valley bottom surface 14b, an inclined surface 15c connecting the mountain top surface 13b and the valley bottom surface 14b, An inclined surface 15d connecting the mountain top surface 13b and the valley bottom surface 14c. That is, in a front view (same as a cross section perpendicular to the span direction), a substantially U-shaped wavy zigzag shape in which the distance between the inclined surface 15b and the inclined surface 15c increases as it is closer to the top surface 13a, 13b. Presents.
Further, the inclined surfaces 15a, 15b, 15c, and 15d are formed with embosses 19a, 19b, 19c, and 19d (only the emboss 19d is shown in FIG. 3) formed by a plurality of pressing processes.

And the latching | locking part 16a for connecting deck plates 10 is formed in the side edge (opposite side of the inclined surface 15a) of the valley bottom face 14a, and the side edge (opposite side of the inclined surface 15d) of the valley bottom face 14c is formed. Is formed with a locking portion 16b for connecting the deck plates 10 to each other.
That is, the locking portion 16a of one deck plate 10 and the locking portion 16b of the other deck plate 10 are engaged with each other, whereby the locking portion 16a of one deck plate 10 and the other deck plate 10 are connected. Can be connected.
At this time, a space (groove) whose upper side is widened is formed by the inclined surface 15a and valley bottom surface 14a of one deck plate 10 and the inclined surface 15d and valley bottom surface 14c of the other deck plate 10. Further, a substantially U-shaped space (groove) formed by the inclined surface 15b, the valley bottom surface 14b, and the inclined surface 15c is formed.
Moreover, since the latching | locking part 16a is the substantially J shape which the downward opening was carried out, and the latching | locking part 16b is a substantially J-shape which opened upwards, when both are engaged, from the said engagement part, the deck plate Concrete (not shown) placed on 10 does not flow out.

  Further, a protrusion 17a is formed on the inclined surface 15a at a position close to the valley bottom face 14a in parallel with the valley bottom face 14a, and a groove 18a is formed between the protrusion 17a and the valley bottom face 14a. Similarly, on the inclined surface 15b, a protrusion 17b is formed in parallel with the valley bottom surface 14b at a position close to the valley bottom surface 14b, and a concave groove 18b is formed between the protrusion 17b and the valley bottom surface 14b. Is formed in a position close to the valley bottom surface 14b in parallel with the valley bottom surface 14b, a groove 18c is formed between the protrusion 17c and the valley bottom surface 14b, and the inclined surface 15d is close to the valley bottom surface 14c. A ridge 17d is formed in parallel with the valley bottom surface 14c, and a concave groove 18d is formed between the ridge 17d and the valley bottom surface 14c.

(Rebar truss)
In FIG. 5, the reinforcing bar truss 30 includes a pair of lattice members 40 a and 40 b that are wires bent in a substantially sawtooth shape (zigzag), and upper ends of the pair of lattice members 40 a and 40 b (same as the bent portions, hereinafter “ Upper chord material 50 to which 43a and 43b are joined) and a lower chord material to which one lower lattice material 40a has a lower end (same as the bent portion, hereinafter referred to as "lattice lower end") 44a is joined. 60a and a lower chord material 60b to which a lower end (same as the bent portion, hereinafter referred to as “lattice lower end”) 44b of the other lattice material 40b is joined, and has a substantially isosceles triangle in front view. .
When the lattice material end portions 41a and 42a of the lattice material 40a and the lattice material end portions 41b and 42b of the lattice material 40b are connected to the upper chord material 50, or the lattice material end portion of the lattice material 40a to the lower chord material 60a. In some cases, lattice material ends 41b and 42b of the lattice material 40b are connected to 41a and 42a and the lower chord material 60b, respectively. Note that a support portion as disclosed in FIG. 2 of Patent Document 1 may be formed on the lattice material lower ends 44 a and 44 b of the reinforcing bar truss 30. Variations are included in the structure and shape of the reinforcing bar truss 30.

(Mounting jig)
In FIG. 6, the attachment jig 20 is a jig main body having a substantially U-shaped cross section formed from a jig top surface 22 and jig side surfaces 23 a and 23 b extending downward from both side edges of the jig top surface 22. Part 21 and jig leg parts 27a and 27b protruding in directions away from the lower ends of jig side faces 23a and 23b. At this time, the boundary between the jig top surface 22 and the jig side surfaces 23a and 23b and the boundary between the jig side surfaces 23a and 23b and the jig leg portions 27a and 27b are connected by a smooth substantially arc. In order to clarify the positional relationship in the range, a solid line is shown in FIG.

Jig cutouts 25a and 25b are formed on the jig side faces 23a and 23b. Above the jig cutouts 25a and 25b, the side protrusion amount increases as the jig cutouts 25a and 25b are approached. Protrusions 24a and 24b and side lower protrusions 26a and 26b are formed below the jig cutouts 25a and 25b. The lower side protrusions 26a and 26b increase in the lateral protrusion as the jig cutouts 25a and 25b are approached.
At this time, the distance between the lower ends of the side upper projections 24a and 24b and the upper ends of the side lower projections 26a and 26b is such that the lower chord material 60b can enter.
The jig legs 27a and 27b extend in directions away from the jig side surfaces 23a and 23b, respectively, and jig tip edges (same as the tip) 28a and 28b parallel to the jig side surfaces 23a and 23b, respectively. Square stealing edges 29a and 29b having a predetermined angle with respect to the jig side surfaces 23a and 23b are provided.
Note that only one pair of jig cutouts 25a and 25b is formed, but the present invention is not limited to this, and may be one place or three places or more.

(How to install the mounting jig on the deck plate)
7A, the jig leg portions 27a and 27b of the mounting jig 20 in a state where the corner theft edges 29a and 29b of the mounting jig 20 are parallel to the protrusions 17b and 17c of the deck plate 10. Is pressed against the bottom surface 14b of the deck plate 10. That is, the distance between the corner stealing edge 29a and the corner stealing edge 29b is smaller than the distance between the protrusion 17b and the protrusion 17c.
In FIG. 7B, the mounting jig 20 is rotated while pressing the jig legs 27 a and 27 b against the bottom surface 14 b of the deck plate 10. Then, the jig leading edges 28a and 28b of the mounting jig 20 enter the concave grooves 18b and 18c, respectively, and the jig leg 27a and the jig leg 27b (the jig leading edge 27c are formed by the concave grooves 18b and 18c. 28a and jig tip edge 28b) are gripped in a direction approaching each other and pressed downward by the ridges 17b and 17c. That is, at the initial stage of rotation of the mounting jig 20, the intersection between the jig tip edge 28a and the corner stealing edge 29a, and the intersection between the jig tip edge 28b and the corner stealing edge 29b are respectively formed into the concave groove 18b and the concave groove. The jig side surfaces 23a and 23b are elastically deformed by strongly abutting (sliding) 18c, and further, when the rotation of the mounting jig 20 proceeds, the jig tip edges 28a and 28b and the grooves 18b and 18c Become parallel. At this time, although the amount of elastic deformation of the jig side surfaces 23a and 23b is reduced, it is in an elastically deformed state, so that the jig tip edges 28a and 28b of the mounting jig 20 are recessed grooves 18b and 18c as described above. Is gripped by.
Therefore, the mounting jig 20 is in a state in which it can contact the deck plate 10 reliably and pass force to each other by a simple operation.

(How to attach the rebar truss to the mounting jig)
In FIG. 8, a reinforcing bar truss 30 is attached to an attachment jig 20 in a state of being installed on a deck plate 10 (not shown).
That is, the space | interval of the lower chord material 60a and the lower chord material 60b of the reinforcing bar truss 30 is widened, and the lower chord materials 60a and 60b enter the jig cutouts 25a and 25b (not shown) of the mounting jig 20 to lower the chord material. 60a and the jig side surface 23a are in contact with the lower chord material 60b and the jig side surface 23b, respectively. In addition, it does not necessarily need to contact | abut by the error on manufacture of the reinforcing bar truss 30, etc. That is, the upper side of the lower chord members 60a and 60b is supported by the lower ends of the side upper projections 24a and 24b (not shown), and the lower side of the lower chord members 60a and 60b is supported by the upper ends of the side lower projections 26a and 26b (not shown). It is supported.
That is, the lattice materials 40a and 40b are gripped in a direction in which the jig side surface 23a and the jig side surface 23b approach each other while being elastically deformed. Therefore, the rebar truss 30 is in a state in which it can be surely brought into contact with the mounting jig 20 by a simple operation and can exchange force with the deck plate 10.

(Mounting jig)
As described above, the mounting jig 20 has a longitudinal distance between the mounting jigs 20 (a longitudinal distance between the jig legs 27a and 27b) between the lower ends 44a and 44b of the lattice members 40a and 40b. It is wider than the distance in the longitudinal direction. That is, since a plurality of lower ends 44a, 44b of the lattice materials 40a, 40b are disposed between one attachment jig 20 and the other attachment jig 20 adjacent thereto, the lower ends of the lattice materials 40a, 40b. Compared with the case where the installation legs that abut the deck plate 10 are provided on all of 44a and 44b and the installation legs abut on the deck plate 10, the number of installation points is reduced.
Further, when installation legs that contact the deck plate 10 are provided on all of the lower ends 44a and 44b of the lattice members 40a and 40b, and the installation legs contact the deck plate 10, the heat of the deck plate 10 is increased. Is transmitted directly to the lattice material, in the present invention, since the reinforcing bar truss 30 is installed on the deck plate 10 via the mounting jig 20, the heat of the deck plate 10 is directly transmitted to the lattice material. There is no.
In addition, the material which forms the attachment jig | tool 20 is not limited, Moreover, you may form with a some material. For example, locally, heat is transferred to the reinforcing bars (lower chord material and upper chord material) by forming the mounting jig 20 with a material having a larger heat capacity than that of the reinforcing bars or a material having a low heat transfer coefficient (heat is not easily transmitted). Can be disturbed.
Furthermore, the jig legs 27a and 27b of the mounting jig 20 may be covered with a resin material having a higher specific heat or a lower heat transfer coefficient than a metal such as a fluororesin.
In some cases, the mounting jig 20 itself may be formed of a synthetic resin material (engineer plastics or the like).
Therefore, since heat transfer from the deck plate 10 to the reinforcing bar truss 30 is suppressed, even when the deck plate 10 is exposed to high temperature, the heat of the deck plate 10 is easily transferred to the lattice members 40a and 40b and the upper chord member 50. Therefore, the strength of the reinforcing bar truss 30 can be maintained.

  Since the present invention has the above-described configuration, heat transfer from the deck plate 10 to the reinforcing bar truss 30 is suppressed, and the strength of the reinforcing bar truss 30 is maintained in the event of a fire. It can be widely used as a steel deck unit of various sizes and forms.

10 deck plate 11 end 12 end 13a peak surface 13b peak surface 14a valley bottom surface 14b valley bottom surface 14c valley bottom surface 15a inclined surface 15b inclined surface 15c inclined surface 15d inclined surface 16a locking portion 16b locking portion 17a ridge 17b ridge 17c ridge 17d ridge 18a groove 18b groove 18c groove 18c groove 19d groove 19d emboss 20 mounting jig 21 jig body 22 jig top surface 23a jig side 23b jig side 24a side upper protrusion 24b side upper protrusion 25a Jig notch 25b Jig notch 26a Side lower projection 26b Side lower projection 27a Jig leg 27b Jig leg 28a Jig tip edge 28b Jig tip edge 29a Square stealing edge 29b Square stealing edge 30 Rebar truss 40a Lattice material 40b Lattice material 41a Lattice material edge 41b Lattice material edge 42a Lattice material edge 42b Lattice material end 43a Lattice material upper end 43b Lattice material upper end 44a Lattice material lower end 44b Lattice material lower end 50 Upper chord material 60a Lower chord material 60b Lower chord material 91 Beam 92 Beam 100 Steel deck unit 101 Unit end portion 102 Unit end portion

Claims (1)

A steel deck unit in which longitudinal ends are respectively installed on one beam and the other beam forming a structure,
A deck plate formed of a bent sheet metal, an attachment jig installed on the deck plate, and a reinforcing bar truss attached to the attachment jig,
The deck plate is a wavy cross section having a peak surface, a valley bottom surface parallel to the peak surface, and an inclined surface connecting the peak surface and the valley bottom surface, and the valley bottom surface of the inclined surface. A ridge formed in parallel with the bottom surface of the valley at a position close to the groove, and a groove formed between the ridge and the bottom surface of the valley,
The reinforcing bar truss has a pair of lattice materials that are bent in a substantially sawtooth shape, an upper chord material to which the upper ends of the pair of lattice materials are joined, and the lower ends of the pair of lattice materials are joined to each other. A pair of lower chord members that are made,
The mounting jig includes a pair of jig body portions formed with a pair of jig notches to be engaged with the pair of lower chord members, and a pair of protrusions formed in the lower ends of the jig body portions and protruding away from each other. Jig legs, and
The front ends of the pair of jig legs of the attachment jig respectively enter a pair of opposed concave grooves of the deck plate, and the pair of jigs are formed by the pair of concave grooves. The legs are gripped in a direction approaching each other,
A steel deck unit characterized in that a longitudinal interval between mounting jigs is wider than a longitudinal distance between lower ends of the lattice material.

Images