MXPA97003051A - Screw-bolt with integral barrena - Google Patents

Abstract

The present invention relates to a one-piece fastener for use in a support structure for a single concrete, the support structure is of the type that includes a plurality of metal support members secured to the concrete slab in a plurality from separate locations, by means of a plurality of fasteners the fastener comprises: a threaded portion having first and second ends and a helical thread or thread, a splined bit tip projecting from the first end of the threaded portion and being located in a first end of the fastener the spline bit and the turn of the helical screw portion has a relatively high hardness such that in the bit tip and the thread pitch are hard enough to penetrate and thread the support members of the type used in the support structure, a first relatively small integral annular flange located above the portion n threaded and having a straight bolt-bolt projecting from the flange opposite the threaded portion, a second and completely long annular flange located on the bolt-bolt part and a driving means located at the top of the second flange annular, to allow engagement by a tool for rotating the fastener and securing thereto in a support member of the type using in the support structure, an upper section of the fastener that includes the first annular flange and threads of the threaded portion which are adapted to be in threaded engagement with a support member being hardened to a lesser degree of hardness than the auger tip in order to make the upper section of the fastener substantially more ductile than the auger tip and the threaded passage the length of the fastener between the first and second flanges being less than the desired thickness of the concrete slab, so that the second The annular flange, when installed on a platform, will remain embedded in the slab and the second annular flange will resist and transmit the shearing forces that the slab can impose on the support structure and, the lower degree of hardness is at a level that imparts sufficient ductility The portions of the fastener that are intended to be projected above the support member to resist and transmit the shear loads imposed by the concrete platform that attempts to move on its support structure.

Description

SCREW-PIN WITH INTEGRATED BARRENA FIELD OF THE INVENTION This invention relates generally to fasteners for securing or securing composite platforms to a steel support structure and, more particularly, to an integrated auger fastener for use as a bolt-bolt with an auger integrated in steel structures. light weight or normal weight composite platforms that are used as floors or ceilings in modern buildings.

BACKGROUND OF THE INVENTION During the construction of a composite platform, the sheets or sheets of the metal platform that are often corrugated or grooved but can also be smooth or flat, are normally secured to the steel structural members. Located along the steel members and projecting upwards there are the metal screw-bolts. A concrete slab formed on the steel platforms encapsulates the metal screw-bolts, so that the bolt-bolts restrict the relative shear movement between the concrete slab and the steel member. In a composite platform two general types of screw-bolts are normally used, the P1177 / 97MX screw-bolts for welding and screw-bolts with integrated auger. Normal screw-bolts for welding are welded directly to the steel structural members and platforms. These screw-bolts are ductile since they are adapted to restrict the relative shear movement between the concrete slab and the steel. The installation of a bolt-bolt welded requires that it make a hole through the platform, by application of heat, in order to join or connect to the steel support member. During this process, the platforms will burn around the steel welded bolt-bolt and will not normally be attached to the support member. This would require a separate connection operation to connect or join the platform with the support member. In addition, a round ceramic insulator is used at the end of the bolt-bolt welded during the installation process. This is used for the purpose of concentrating the heat and assisting during the welding of the bolt-bolt to the support member. Once the welded bolt-bolt is attached, the round ceramic insulator needs to be removed from the base of the bolt-bolt welded, in order for the concrete to encapsulate the bolt-bolt. At this point, the typical way to remove or eliminate these ceramic insulators is to hit them with a P1177 / 97MX hammer to detach them from the base of the bolts-bolts welded already installed. Because these ceramic insulators are brittle, when they are separated from the welded screw-bolts, they break apart and the ceramic pieces disperse on the surface of the platform. These ceramic pieces need to be removed from the surface of the platform before casting the concrete, both for safety reasons and to avoid their integration into the concrete mix and contamination of the integrity of the concrete. The use of screw-bolts with integrated auger, applied by shear, does not require the above additional operations. During the process of welding the screw-bolt through the platform, the protective covering of the cover is damaged due to the intense heat produced, making it susceptible to corrosion. The normal recommended practice is to apply a protective coating to the bare or damaged material of the platform, to reduce the effects of corrosion. The use of screw-bolts with integrated auger, of application by shear, does not require the previous additional operation. Due to the nature of the welded joint between the bolt-bolt and the steel, the diameter of the bolt-bolt welded establishes a minimum thickness of material required for the structural member. The smallest welded screw-bolts that are used and P1177 / 97MX which are commercially available currently establish a lower limit on the thickness of the material of the structural member that can be used with these welded screw-bolts. The smallest diameter of the currently available welded bolt-bolt is 1/2"in diameter, which requires a minimum steel thickness of 0.200"If the thickness of the steel is less than 0.200", thickness normally found in the construction of typical lattice girders, the bolt-bolt welded is not recommended. The screw-bolts with integrated auger, of application by shear, present an alternative in these applications. Screw-bolts with integrated augers are thus an attractive alternative to welded bolts for use in composite platforms. Screw-bolts with integrated auger do not limit the minimum material thickness of the structural member. In addition, the screw-bolts with integrated auger hold the platform to the steel, eliminating in this way the necessary separate connection when using bolts-welded bolts. The screw-bolts with integrated auger also avoid other problems of the welded bolts-bolts, such as the removal of the bolt-bolt ceramic insulator after its installation and the cleaning of the ceramic pieces that are caused by the removal. The platform is not damaged P1177 / 97MX and, of course, eliminates the need to repair the metal platform and to connect it or connect it to the bolt-bolt or metal support. The use of a screw-bolt with integrated auger does not create a damaged area on the platform and must be repaired and, instead, when properly installed provides a means to connect or join the platform with the steel member . However, in order for the screw-bolts with integrated auger to be able to drill or drill into the steel, the screw-bolts with integrated auger must be thermally treated to a relatively high degree of hardness. This standard processing results in reduced ductility and, in the screw-bolt with integrated auger, the ductility is necessary to transfer the shear movement in the composite platform system. Some screw-bolts with integrated auger have tried to compensate for this basic deficiency by insulating the bolt-bolt from the concrete with a separator. The separator attempts to convert the shearing action of the concrete slab into a moment of bending, which the hardened bolt-bolt is more apt to resist. However, this does not change the non-ductile nature of screw-bolts with integrated auger.

P1177 / 97MX SUMMARY OF THE INVENTION The general objective of the present invention is to provide a new and improved screw-bolt with integrated one-piece auger for use in a composite platform system, wherein the use of screw-bolts for attachment by Standard type welding is inappropriate because the cross section of the steel member is less than that accepted in practice. A more detailed objective is to achieve the above by thermally treating the bolt-bolt to a double hardness level, so that a portion of the bolt-bolt is capable of drilling the steel as long as the remaining bolt-bolt portion is sufficiently ductile to transmit the shearing forces of a system of composite platforms towards the main structural members. An even more specific objective is to achieve the above by thermally treating the tip of the auger, the cutting lips and the guide lips of the screw-bolt with integrated auger, up to a relatively high degree of hardness while maintaining the rest of the bolt-bolt in a relatively ductile state. Another general object of the invention is to provide an improved nailing between the bolt-bolt with integrated auger and the concrete slab in the system P1177 / 97MX of composite platform. A particularity of the invention is that the screw-bolt with integrated auger is provided with an integral flange, which automatically establishes or determines the height of the bolt-bolt portion that will be encapsulated in the concrete slab, for an appropriate concrete cover , and that secures the platform with steel and is shaped to transmit the shearing or cutting loads. A further particularity is to provide a screw-bolt with integrated auger having a second integral flange which is located close to the screw-bolt insertion head and which interacts with the concrete to limit the deflection of the steel. This feature can be improved by the use of a composite nut for bolt-bolt with integrated auger, for application by shear, in conjunction with the bolt-bolt application when used in thin steel structural members. These and other objects and advantages of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

P1177 / 97MX BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a fragmentary perspective view of a typical composite platform structure using the new and improved integrated screw-bolts incorporating the unique features of the present invention. Figure 2 is a fragmentary and enlarged cross-sectional view, taken mainly along line 2-2 of Figure 1. Figure 3 is an enlarged side view of one of the screw-bolts shown in Figures 1 and 2. Figure 4 is an enlarged bottom view of the screw - bolt as seen along line 4-4 of Figure 3. Figure 5 is a cross-sectional view, taken axially through the bolt-bolt of Figure 3, the diagonally bladed pattern represents an area of the screw-bolt that is heat treated to a relatively high degree of hardness. Figure 6 is an enlarged view of the drilling and screwing end of the bolt-bolt shown in Figure 5. Figure 7 is a partial view, similar to that of Figure 2, showing a modified version of the bolt-bolt application by shear, in a P1177 / 97MX suitable installation for light steel structural members. While the invention is susceptible to various modifications and alternative constructions, a certain illustrated embodiment thereof has been shown in the drawings, which will be described in detail below. However, it should be understood that there is no intention to limit the invention to the specific form presented, but rather, the intention is to cover all modifications, alternative constructions and equivalents that fall within the spirit and scope of the invention.

DESCRIPTION DFTAt.t.nn »OF THE PREFERRED MODALITY For purposes of illustration, the present invention is conceptualized in. the drawings, showing an embodiment of a bracket 10 with integrated auger (Figure 1) that is especially useful as a bolt-bolt with integrated auger for use in structures 11 of composite platforms, which are used as floors or ceilings in the modern buildings. A floor or roof platform that is subjected to shearing forces that tend to cause a horizontal or shear movement of the platform with respect to its support structure. The screw-bolt with integrated auger 10 of the present invention restricts and transfers this shearing movement P1177 / 97MX when used in a composite platform system. A composite platform 11 is usually manufactured at the construction site. During the construction of the building, the metallic secondary structural members 12, such as joists or beams, but without being restricted thereto, are attached to the structural support beams of the building (not shown). The metal structural members will sometimes be referred to herein as metal joists and this term will be used in its broadest sense as a general characterization of the metallic secondary structural members. When steel joists are used, these are usually comprised of elongated horizontal members, upper and lower, 13A and 13B, vertically spaced apart, and further comprise support core members 14 attached to the horizontal members 13A and 13B and extending therebetween. same. In lightweight composite platform systems, the joist members are formed with ropes having a relatively thin cross section (eg, less than 0.200"). The metal platform 15 is normally placed and extends over adjacent joists, so that if undulations are present, they run at a right angle to the joists, although the composite platform can be manufactured without a corrugated platform or P1177 / 97MX corrugated. Screw-bolts with integrated drill 10 are located on the upper members 13A of the joists and projecting upwards thereof. A concrete slab 16 is cast on the corrugated platform, encapsulated to the upper portion. of the screw-bolts. Each screw-bolt with integrated auger 10 (Figure 3) has an elongate body 17, which has an integral threaded portion 18 with helical threads or threads and a non-threaded portion 19. Projecting from the lower end of the threaded portion is a tip of fluted auger 20. Located at the end of the bolt-bolt opposite the auger tip is an introduction head 21. The introduction head is formed to engage with an insertion tool that is capable of guiding the bolt-bolt, but which is not limited to the hexagonal shaped introduction head shown in Figure 3 nor to the hexagonal socket wrench or any of the many other well-known means of rotation introduction. The insertion tool is then used to introduce the auger tip and the threaded portion of the bolt-bolt through the valleys of the corrugated platform 15 (Figure 2) and the upper members 13A of the steel joist 12. The tip of Auger 20 is defined by two P1177 / 97MX metal cutting edges 22 and two flutes 23. The two flutes extend upwards from the screw-bolt end and towards the first helical threads or threads in the threaded portion 18. Two bevelled faces 24 are carved at the end from the tip to an angle projecting upwards and outwards from the center of the bolt-bolt. The two beveled surfaces are diametrically spaced around the screw-bolt end (FIGURE 4). The two ridges 23 are also diametrically separated and start rotated at approximately 90 degrees from the beveled surfaces. The cutting edges 22 of the bit tip are defined by the sharp edges created at the intersection of the grooves and the bevelled surfaces and are located at the six o'clock position and the twelve o'clock position, when the bolt-bolt is observed according to Figure 4. The cutting lips 25 (Figure 3) of the screw-bolt with integrated drill 10 are defined by the first threads or threads that open from the grooves extending towards the threaded portion 18 adjacent to the tip of auger. According to the present invention, the screw-bolt with integrated auger 10 (Figure 2) is thermally treated, selectively, to a double hardness level, so that the inner portion of the bolt-bolt P1177 / 97MX has a relatively high degree of hardness to allow the platform 15 and the steel member (ie, the joists) 12 to be swept and tapped, while the remaining portion of the bolt-bolt is thermally treated to a lower degree of hardness, so that it remains relatively ductile and capable of resisting and transmitting the shearing forces of the concrete slab 16, generally directed to the left or to the right with respect to the support. In addition, the screw-bolt with integrated auger is uniquely constructed, so that it is positioned or correctly avoided and improves the interlocking with the concrete slab, in addition to establishing the correct cover of the concrete slab. More specifically, an integral annular flange 26 is located between the threaded and non-threaded portions 18 and 19 of the bolt-bolt 10. During the construction of the composite platform 11, the lower portions of the bolts-bolts with integrated bit 10 (FIG. ) are introduced through the valleys of the platform 15 and through the upper horizontal members 13A of the steel joists 12. When each bolt-bolt is tightened, the base of the flange 26 engages with the platform 15, holding the this way to the platform with the underlying horizontal joist member. The flange 26 provides a positive localized grip, which is P1177 / 97MX finds quite effective in these applications. In addition, the flange 26 adds stability to the bolt-bolt tightened and positions the height of the insertion head 21 with respect to the horizontal joist member, thereby defining the portion of the bolt-bolt to be encapsulated in the concrete slab 16, for the correct roofing requirements with concrete, above the bolt-bolt. The shape of the flange 26 is of particular significance. A lower surface 30 is substantially flat or smooth and joins the threaded body portion 18 at a reasonably precise right angle. When the bolt-bolt is drilled on site, shown in Figure 2, the lower surface 30 will securely hold the upper side of the platform with the underlying joist. In contrast to the lower side precisely angled and flat, the upper side of the flange 26 is rounded uniformly as in 32 to slowly flare from the angular flange to the vertical body. It was found that the curved joint is important to avoid cracking of the bolt-bolt when subjected to bending loads. The curved shape may also tend to distribute the shear forces, particularly when the platform or cover P1177 / 97MX concrete has an important component that loads the flange against the corrugated platform and the joist. A second integral annular flange 27 (Figure 3) is located directly below the introduction head 21, between the insertion head and the non-threaded portion 19 of the screw-bolt 10. The flange 27 has a larger diameter than the flange 26. When a shearing force acts on the upper portion of the bolt-bolt 10 that is encapsulated in the concrete slab 16 (Figure 2), the non-threaded portion 19 of the bolt-bolt tends to be bent or cantilevered, around the center of the lower flange 26, thereby tending to pivot the insertion head 21 and the upper flange 27. As the upper flange 27 and the insertion head try to pivot in the concrete, the concrete surrounding the upper flange 27 and the introduction head responds with a pair of resetting forces. This pair of forces is applied to the underside of the flange 27, opposite to the shearing force and to the upper side of the flange 27 and the introduction head on the side of the shearing force, thus tending to reduce the deflection screw-bolt in response to shear force. In this way, the diameter of the relatively larger flange 27 improves the structural interlocking between the P1177 / 97MX screw-bolt and concrete slab. This same pair of forces also has the effect of creating an upwardly directed force on the bolt-bolt, on the underside of the upper flange 27, which tends to act through the threaded section to reduce the deflection of the lower rope of the joist in which the screw-bolt is screwed. Figure 7 illustrates a modified version of a cutting screw-bolt, in accordance with the invention, and which is particularly suitable for light steel structural members. In the embodiments described hitherto, the screw-bolt cut depends on its threaded coupling with the structural steel member for the retention of the platform system. However, when the secondary steel support is rather thin, an auxiliary retaining means may be useful. Figure 7 shows a bolt-bolt 10, applied by shear, constructed in the same way as the screw-bolts of application by shear of the previous modalities, but associated with a retaining member 40 that is intended to increase the strength of the screw -perno to the extraction of the steel support. The retaining member 40 is a specially designed composite nut, adapted to be used with the cutting screw-bolt 10. The cutting screw-bolt 10 is installed in the P1177 / 97MX platforms, as in the case of the previous modalities. However, either before or after casting the concrete platform, a worker will have access to the screw-bolt-cutter arrangement from the bottom of the platform and will be able to apply a nut 40 to the threaded portion of the body that is projected to through the platform and secondary structural support. The nut 40 can be applied by means of a conventional motorized nut wrench, in a relatively simple operation, where the worker simply proceeds along the bolt-bolt line, one by one, applying the special nuts. The presence of the nut 40 in connection with the slender structural member will significantly increase the extraction or pulling force of the bolt-bolt and provides an important assistance in the transmission of the shear loads from the platform to the structural member. In effecting the invention, the screw-bolt with integrated auger 10 is heat treated to a double hardness level with a Drill-Felx® heat treatment process developed by Elco Industries, Inc., Rockford, Illinois. Specifically, the lower portion of the screw-bolt with integrated auger, as shown in Figures 5 and 6 by a diagonal taper, comprises the bit tip 20 and a minority of turns.

P1177 / 97MX 28 of the threaded portion 18, including the cutting lips 25 and a few guide lips, adjacent to the cutting lips, are heat treated to a relatively high hardness, so that it is capable of effectively drilling and tapping the platform 15 and the upper horizontal joist member 13A. The remaining portion of the screw-bolt with integrated auger, that is, the insertion head 21, the non-threaded portion 19, the annular flanges 26, and 27 and the remainder of the threaded portion 18 which is co-jointed with the joist member and which is adjacent to the annular flange 26, is treated thermally to a lesser degree of hardness, so that it remains relatively ductile and capable of resisting and transmitting the shearing forces of the secondary floor or roof members towards the main structural supports, without fail. By way of example, the lower portion of the bolt-bolt is hardened to a minimum hardness of 50 Rockwell C while the remainder of the bolt-bolt portion is hardened to 50% -70% of the bit tip. An example with the above explanation is not required. From the foregoing, it will be evident that the present invention brings to the art a bolt-bolt with integrated auger 10, lacking a new or improved liner or sheath, for use on lightweight or normal weight composite platforms 11, where the use of screw-bolts P1177 / 97MX standard for welding connection. In addition, the ability of the screw-bolt with integrated bit 10 to resist and transfer the shear forces in a composite platform improves with respect to the screw-bolts with integrated bit already known, by virtue of the double hardness levels incorporated in the bolt-bolt and the supply of the integral flange 27 which improves the interlocking between the bolt-bolt and the concrete slab 16 and the secondary or primary structural members. The present invention also provides installation advantages over screw-bolts for welding.

P1177 / 97MX

Claims (7)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property: 1. A one-piece fastener for use in a support structure for a slab of concrete, the support structure is of the type that includes a plurality of metal support members secured to the concrete slab in a plurality of separate locations, by a plurality of fasteners, the fastener comprises: a threaded portion having first and second ends. second and a helical thread or fillet, a fluted auger tip projecting from the first end of the threaded portion and which is located at a first end of the fastener, the fastener is characterized by a relatively high hardness at the fluted auger tip and a selected minority of turns or coils of the helical threaded portion, so that the auger tip and the selected coils are hard enough to penetrate and thread the support members, a first integral annular flange located above the threaded portion and having a P1177 / 97 X straight screw-bolt projecting from the flange opposite the threaded portion, a second annular flange located at the top of the bolt-bolt and an insertion means located at the top of the second annular flange, for enabling engagement by a tool and for rotating the fastener and securing it to a support member of the type used in the support structure i, an upper section of the fastener, which includes the first annular flange and the threads or fillets of the portion threaded fittings that are adapted to be in threaded engagement with a support member, have been brought to a lower degree of hardness than the auger tip in order to make the upper section of the fastener substantially more ductile than the auger tip and the selected threads or fillets, the length of the fastener between the first and second flanges is less than the desired thickness of the concrete slab, so that the second annular flange, when installed, will be embedded in the slab and the second annular flange will resist and transmit the shearing forces that the slab can impose on the support structure and, the lower degree of hardness is found P1177 / 97MX at a level that imparts sufficient ductility to the portions of the fastener that are intended to be projected above the support member, to resist and transmit the shearing loads imposed by the concrete platform attempting to move on its support structure. A one-piece fastener according to claim 1, characterized in that the diameter of the first flange is smaller than the diameter of the second flange. A one-piece fastener according to claim 1, characterized in that the first annular flange has a relatively flat base and a continuously rounded upper part, which joins smoothly to the straight portion of the bolt-bolt to resist cracking by application of shear force. A one-piece fastener according to claim 1, characterized in that an integral non-threaded portion is disposed above the first annular flange and the insertion means is an integral insertion head to the unthreaded portion, at one end of the flange. the same opposite to the tip of the auger immediately adjacent to the second annular flange. 5. One piece fastener according to the P1177 / 97MX claim 4, characterized in that the support structure is a composite platform, the plurality of support members support the platform, which supports, in turn, the concrete slab, the fasteners are adapted to penetrate the platform and settle on the underlying support members, the fastener is characterized because the bit tip and the selected turns, immediately adjacent to the auger tip, bore and threaten the platform and one of the support members, the fastener is adapted to be secured to the platform and the support member by tightening the fastener with the insertion head until the first flange dock with the platform. A one-piece fastener according to claim 5, characterized in that the first flange has a substantially flat inner side, which is adapted to create or generate a force that holds the platform to the support member, when the fastener is screwed into the support member, and a curved upper surface that is smoothly joined to the body and that is shaped to resist cracking under shear load. A one-piece fastener according to claim 4, characterized by a threaded nut of a size that fits the threaded portion of the fastener P1177 / 97MX and that it is adapted to be applied to the fastener after the screw-bolt is secured to the platform and the member. P1177 / 97MX