JPS6325145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite floor structure for corrugated steel flooring and electrical wiring and piping for supplying hot and cold air of the type used in constructing floors of modern buildings.

Corrugated steel flooring has been used as a building element for many years. The corrugated steel sheets are affixed to the steel framework of the building and constitute the membrane surface for each floor of the building, as well as serving as a permanent formwork for the concrete that is subsequently poured.
The concrete serves as a walking surface for each floor during the life of the building. During the initial stage of construction, the corrugated steel flooring serves only to support and shape the poured concrete until it hardens. It is not designed to contribute to the strength of the floor.

Initially, buildings with steel plate floors were designed such that the load-bearing strength of the steel components would withstand the entire flooring load, including the weight of the concrete applied to the steel plate flooring. Therefore, the earliest steel floor buildings were limited to relatively short spans (8 to 10 feet or 2.4 to 3 meters) and required thick metal (16 gauge, 18 gauge). In the early 1960's, the steel plate flooring industry began introducing deformations on certain selected surfaces of corrugated steel plate flooring and subsequently matched the poured ready-mixed concrete to the deformations. When the concrete hardens, the corrugated steel flooring and hardened concrete form a composite slab.
It functioned as With this composite plank, the designer was able to consider (a) the tensile strength of the corrugated steel flooring and (b) the compressive strength of the concrete slab.

The resulting flooring was considered to be a concrete slab reinforced with corrugated steel flooring, which provides steel reinforcement to the concrete.

Composite floor designs provide modern steel/concrete floors that derive some of their load-bearing capacity from the tensile strength of the corrugated steel flooring and also derive some of their load-bearing capacity from the compressive strength of the concrete. Concrete and steel must act compositely to achieve composite design features. That is, the concrete and corrugated steel plate must act as a single plank. As a result of composite design, corrugated steel flooring spans can be extended to longer spans (15~
20 feet, i.e. 4.5 to 6 m);
Furthermore, the thickness can be made thinner (18 gauge, 22 gauge).

Such a synthetic floor structure is described in U.S. Patent No. 3,812,636
(column 1, lines 46-62) (issued May 28, 1974) and U.S. Patent No. 3,956,864 (column 1, lines 3-15) (May 1976).
(published on the 18th of May).

Therefore, the unevenness of the surface and cross-sectional shape of the corrugated steel plate flooring makes it possible to bond the concrete and the corrugated steel plate flooring, and thus the concrete and the corrugated steel plate flooring can be combined into a finished building. Acts synthetically on the floor. The corrugated steel flooring can be taken into account for its contribution as a tensile force resisting element, whereas the concrete can be employed for its compressive force resisting properties. In buildings with such composite floors, the concrete and the corrugated steel flooring together contribute to the maximum load-bearing capacity of the building floor.

In order to bond the corrugated steel flooring and the concrete as described above, indentations, embossing, grooves, ribs and other physical deformations are applied to the corrugated steel flooring to bond it to the subsequently poured concrete. Mechanical contact is achieved, thus ensuring a reliable bond between the corrugated steel flooring and the concrete.

A synthetic floor structure goes through three distinct stages during its construction process. In its first step, the corrugated steel flooring is affixed to the building's structural framework. The structural framework is typically horizontal steel beams projecting between vertical steel columns. During this first stage, the corrugated steel flooring constitutes a structural element that can simply be used by workers to walk on it or to move construction vehicles. Therefore, the corrugated steel flooring must have sufficient strength to support the weight of the workers and anticipated construction vehicles.

During the first step, if a worker thumps around a corner of the corrugated steel flooring or if a worker drops a construction tool onto the corrugated steel flooring, the corrugated steel flooring may Damage may occur.

In the second step of the corrugated steel floor construction process, concrete is poured over the entire surface of each floor. Uncured concrete contributes nothing to the load-bearing capacity of the finished floor. Therefore, during this second stage, the corrugated steel flooring must support the weight of the uncured concrete in addition to its own weight. The ability of the corrugated steel flooring to support the weight of the uncured concrete is
It is expressed as the "wet strength" of the flooring material. If the "wet strength" of the flooring is not sufficient to support the weight of uncured concrete on the span, it is customary to supplement the load-bearing capacity of said flooring by providing supports or pegs. .

The third stage of the construction process of the corrugated steel flooring begins when the concrete is completely cured and the hardened concrete is combined with the corrugated steel flooring to form a composite floor structure. During this third stage, a good mechanical bond is created between the concrete and the corrugated steel flooring.

The present invention is a corrugated steel plate flooring material comprising a steel plate having a cross-sectional shape having a peak surface, a valley surface, and an inclined web surface, and in which raised grooves are formed by each of the peak surfaces and the inclined web surfaces continuous on both sides thereof. , a connecting portion for connecting a plurality of the corrugated steel sheet floorings to each other is arranged on each side of the corrugated steel sheet flooring, and has a length that extends under the crest surface without being interrupted over the entire length of the corrugated steel sheet flooring. a directional groove is provided in each of the sloped web surfaces adjacent to the top of the raised groove, and a plane containing the sloped web surface intersects the ridge surface at or outside an adjacent side edge of the ridge surface; To provide a corrugated steel plate flooring material characterized by:

Further, the present invention comprises a group of corrugated steel floorings connected side by side and fixed to the building framework, each of the said floorings having a cross-section having a ridge, a valley and an inclined web surface. A raised groove is formed by each of the peak faces and an inclined web face continuous on both sides thereof, and connecting portions for interconnecting a plurality of the corrugated steel plate flooring materials are provided on each side of the flooring material. and providing each of the sloped web surfaces adjacent the top of the raised grooves with a longitudinal groove extending uninterruptedly below the ridge surface over the entire length of the flooring; intersects the ridge surface at or outside of adjacent side edges of the ridge surface, and the cover plate straddles between at least one pair of opposing grooves,
forming the top of an enclosed longitudinal compartment, said cover plate having at least one opening leading into said longitudinal compartment, and having a concrete covering layer over said connected steel plate decking. A synthetic floor structure is provided.

1 The longitudinal groove is located at the corner of the top flange.
Since it provides resistance to buckling, the impact resistance of the corrugated steel flooring is improved.

2. By providing the longitudinal grooves, the effective length of each of the inclined web surfaces is shortened, and as a result, the clipping strength of the inclined web surfaces of the corrugated steel flooring is increased. This feature increases the wet strength of the corrugated steel flooring in the second stage.

3. The longitudinal grooves provide excellent bonding between the concrete and the corrugated steel flooring in the region of the peak where the shear stress between the concrete and the corrugated steel flooring is maximum. .
This feature increases the load-bearing capacity of the resulting composite bed in the third stage.

4. Other advantages arise when the corrugated steel flooring is in the form of a composite floor structure and the ridges are provided with access openings for power distribution. That is, in prior art composite floor structures, the strength of the steel plate flooring is significantly reduced due to the peak access openings. In some cases, it was necessary to use heavier gauge flooring or shorten the span. However, the longitudinal grooves of the present invention greatly increase the strength of the crest region and effectively prevent the strength loss that may occur due to access openings in the ridge. Now I can do it.

Next, embodiments of the present invention will be described with reference to the drawings.

The corrugated steel plate flooring 20 of the present invention includes a peak surface 21, a valley surface 22, and an inclined web surface 23. A longitudinal reinforcing bead 24 is formed on the peak surface 21 so as to protrude below the peak surface. A longitudinal reinforcing bead 25 is formed in the middle of the valley surface 22. The inclined web surface 23 is provided with a longitudinal groove 26 near the corner 27 of the top flange of the peak surface 21 without interruption over the entire length of the flooring. This corrugated steel plate flooring 20 has many raised grooves (raised grooves).
Each raised groove is formed by a peak surface 21 and an inclined web surface 23 continuous on both sides of the peak surface 21. A longitudinal groove 26 projects into the raised groove, ie below the ridge surface.

Connections 14, 15 for interconnecting a plurality of corrugated steel floorings 20, 41 are arranged on each side of the corrugated steel flooring. That is, in FIGS. 1 and 3,
One of the connecting portions is a connecting flange 14, and the other is a connecting groove 15, which are provided on the left and right sides of the flooring, respectively. The connecting groove 15 in the figure can engage with the connecting flange 14 of the adjacent flooring material on the left (not shown). The intersection line K between the plane including the inclined web surface 23 and the peak surface 21 coincides with the side edge E of the peak surface 21 adjacent to the inclined web surface 23 or is located on the outside thereof.

The inclined web surface 23 has a substantially flat side section on which a number of deformations 28 are provided. This deformed portion 28 preferably takes the form of parallel finger-shaped depressions.

The width of crest 21 is indicated by distance 29 in FIG. The inner surfaces of longitudinal grooves 26 are spaced a distance 30 apart. It can be seen from FIG. 2 that distance 30 is shorter than distance 29. The radius of bending curvature of the corner 27 of the top flange is preferably about 3 to 10 mm. The depth of the longitudinal groove 26 is approximately 5 to 15 mm.
is preferred.

The material of the corrugated steel flooring 20 of the present invention is hot or cold rolled steel sheet, particularly galvanized steel sheet, having a gauge thickness of 22 to 16. The corrugated steel plate flooring material 20 usually has a width of 60 to 300 cm and a height from the peak surface 21 to the valley surface 22 of 35 to 100 mm.

The corners 27 of the top flange of the corrugated steel flooring 20 of the present invention have spring-like properties as a result of the longitudinal grooves 26 extending into the underside of the ridges 21. Therefore, impacts on the corners 27 of the top flange are absorbed by the longitudinal grooves 26. The shear stress between the corrugated steel plate flooring 20 and the concrete covering is at its maximum below the crest 21. Longitudinal groove 2
6, the bonding surface to the concrete is widened where maximum shear stress occurs.

The corners 27 of the top flange strengthen the corrugated steel flooring 20 and improve its wet strength. Due to the rigidity of the crest 21 due to the longitudinal grooves 26, the provision of access openings in the ridge 21 does not significantly reduce the structural properties of the corrugated steel flooring 20.

The crippling tendency of the inclined web surface 23 is determined by the length of its flat portion. In FIG. 1, the length of the flat portion of the inclined web surface 23 is shorter than the distance between the peak surface 21 and the valley surface 22 along the inclined web surface 23. The reason why the length of the flat portion of the inclined web surface 23 can be shortened in this manner is that the longitudinal groove 26 is provided in accordance with the present invention.

By bridging opposing longitudinal grooves of the corrugated steel flooring of the present invention with ribbon-like cover plates, an inexpensive and useful composite floor structure is obtained.

In FIG. 3, the corrugated steel flooring 41 is provided with a cover plate 45 having a suitable opening 57 (FIG. 4) through which the electrical wire 58 is directed upwardly into the concrete layer 47. In order to use the wiring inside the building, a cylindrical body 51 (see FIG. 3) extending from the opening 57 into the building is connected to the opening 57. A depression or embossment 59 is formed on the inclined web surface of the corrugated steel flooring 41.
A plurality of deformed portions having the shape of may be provided. Furthermore, a depression or an embossment 60 may be provided in the peak surface.

The cover plate may also be provided with spaced apart lateral reinforcing beads 70 (FIG. 4).

To fix the cover plate 45 to the corrugated steel plate flooring 41 at the building site, the cover plate 45 is slid along the length of the corrugated steel plate flooring 41, or the cover plate 45 is fixed to the corrugated steel plate flooring 41 along the length It is fitted into the longitudinal groove of the corrugated steel plate flooring 41 by press-fitting from above the directional groove. Cover plate 45
can be a single strip element having a length corresponding to the length of the corrugated steel flooring 41, or can be composed of a plurality of strips. When the cover plate 45 is made of a plurality of strips, by leaving a space between the strips, it is possible to access the interior of the compartment at a low cost.

This composite floor structure does not require drilling holes in its ridges or sloped webs for electrical wiring.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a corrugated steel flooring according to the present invention. FIG. 2 is a fragmentary cross-sectional view of a portion of the corrugated steel flooring of the present invention. FIG. 3 is a cutaway perspective view of a composite floor structure in which the corrugated steel flooring of the present invention is covered with a cover plate. 4 is a perspective view of a representative cover plate for use with the composite floor structure of FIG. 3; FIG. 20... Corrugated steel plate flooring material, 21... Peak surface, 22...
... Valley surface, 23 ... Inclined web surface, 26 ... Longitudinal groove, {14 ... Connection flange, 15 ... Connection groove, } ... Connection section, 24, 25 ... Longitudinal reinforcement bead, 28 ...Deformed part, 45...Cover plate,
57... Opening provided in the cover plate, 70... Laterally reinforcing bead of the cover plate.

Claims (1)

[Scope of Claims] 1. A corrugated steel plate flooring material made of a steel plate having a cross-sectional shape having a peak surface, a valley surface, and an inclined web surface, and in which raised grooves are formed by each of the peak surfaces and the inclined web surfaces continuous on both sides thereof. A connecting portion for interconnecting a plurality of the corrugated steel plate floorings is disposed on each side of the corrugated steel plate flooring, and the connecting portion is disposed on each side of the corrugated steel plate flooring, and the connecting portion is arranged under the ridge surface without interruption over the entire length of the flooring. a longitudinal groove is provided in each of the sloped web surfaces adjacent the top of the raised groove, and a plane containing the sloped web surface is connected to the crest surface at or outside of an adjacent side edge of the ridge surface. Corrugated steel flooring characterized by its intersecting characteristics. 2. Claim 1, wherein the distance between the inner surfaces of the two longitudinal grooves of each raised groove is set to a distance narrower than the width of the peak surface.
Corrugated steel flooring as described in section. 3. The corrugated steel plate flooring material according to claim 1, wherein the peak surface is provided with a longitudinal reinforcing bead that protrudes into the raised groove. 4. The inclined web surface is substantially flat between the adjacent valley surface and the longitudinal groove, and the flat surface is further provided with a plurality of deformed portions in the form of depressions or embossings. A corrugated steel plate flooring material according to claim 1. 5. A group of corrugated steel plate flooring materials connected in parallel and fixed to the framework of a building, each of the said flooring materials being made of steel plates having a cross-sectional shape having a peak surface, a valley surface, and an inclined web surface. a raised groove is formed by each of the peak surfaces and the inclined web surfaces continuous on both sides thereof, and connecting portions for interconnecting the plurality of corrugated steel plate flooring materials are arranged on each side of the flooring material, a longitudinal groove extending uninterruptedly under the ridged surface along the entire length of the floor covering, adjacent to the top of the raised groove, on each of the sloped web surfaces, the plane containing the sloped web surface being , intersects the ridge surface at or outside of adjacent lateral edges of the ridge surface, and the cover plate spans between at least one pair of opposed grooves to form the top of an enclosed longitudinal compartment. The composite floor structure is characterized in that the cover plate has at least one opening communicating into the longitudinal compartment, and a concrete covering layer is provided on the connected steel plate flooring. . 6. A composite floor structure according to claim 5, characterized in that the cover plate is juxtaposed with spaced apart lateral reinforcing beads. 7. The composite floor structure according to claim 5, wherein the cover plate is fixed along the side edges of the longitudinal grooves of the opposing inclined web surfaces.