Structural Truss Module With Fastener Web and Manufacturing Method Therefor

Abstract

A structural truss module employs a fastener web to interconnect elongated wood chords. The web comprises a plurality of metal support rods. Each of the support rods has opposed threaded sections which are each threadably engaged to opposed chords preferably at an angle thereto. In one embodiment, a matrix of quasi-convergent adjacent pairs of support rods is employed. The structural truss modules may form part of a roof for a header or a structural wall.

Claims

1. A structural truss module comprising: a spaced pair of generally parallel elongated support beams; and a web connecting said support beams, said web comprising a plurality of metal support rods each having a pair of opposed threaded sections each threadably engaged to an opposed beam at an angle thereto.

2. The structural truss module of claim 1 wherein each said beam has a transverse medial line and said rods generally engage each said beam along said medial line.

3. The structural truss module of claim 1 wherein said web defines a matrix of quasi-convergent adjacent pairs of support rods.

4. The structural truss module of claim 3 wherein each adjacent pair of support rods defines a substantially identical profile.

5. The structural truss module of claim 1 wherein said elongated support beams are selected from the group consisting of 23 wood chords, 24 wood chords and engineered wood components.

6. The structural truss module of claim 1 wherein each said metal support rod comprises an elongated screw having a head, a threaded portion adjacent said head, an intermediate unthreaded portion, a distal tip and a threaded portion adjacent said distal tip.

7. The structural truss module of claim 1 wherein each said metal support rod has a drive head which is embedded in a support beam and spaced from an edge of said support beam.

8. The structural truss module of claim 1 wherein said structural truss module is employed in an integrated construction assembly as a roof truss or floor truss.

9. The structural truss module of claim 1 wherein said structural truss module is employed as a shear panel in a vertical wall.

10. The structural truss module of claim 1 wherein said truss module is employed as a header in a construction assembly.

11. The structural truss module of claim 1 wherein said plurality of support rods further comprise a plurality of groups of multiple parallel support rods.

12. The structural truss module of claim 11 wherein said multiple parallel support rods for each group are selected from the group consisting of two, three and four support rods.

13. A structural truss module comprising: a spaced pair of generally parallel elongated wood chords; a web connecting said chords, said web comprising a plurality of fasteners each having two spaced threaded sections each threadably engaged to a wood chord at an angle thereto.

14. The structural truss module of claim 11 wherein the angle is 45 or 90.

15. The structural truss module of claim 11 wherein each said fastener has a drive head and a tip, and each said head and tip is embedded in a chord a distance spaced from an outer edge of said chord.

16. The structural truss module of claim 13 wherein said distance is 1 inch to 1.5 inches.

17. The structural truss module of claim 11 comprising a plurality of quasi-convergent pairs of fasteners.

18. The structural truss module of claim 13 wherein said web further comprises multiple groups of parallel fasteners.

19. The structural truss module of claim 18 wherein each said group of fasteners has two, three or four fasteners.

20. A method of manufacturing a structural truss module comprising a first and a second chord comprising: positioning said chords in a jig assembly wherein said chords are disposed in parallel spaced relationship; pre-drilling pilot bores through an edge of said first chord at longitudinally spaced locations along said chord; drivably installing a first set of fasteners through said first chord so that said fasteners threadably engage in said second chord and in said first chord; drivably installing a second set of fasteners in said first chord so that said fasteners threadably engage in said second chord and threadably engage in said first chord; and removing said chords and installed fasteners from said jig assembly.

21. The truss manufacturing method of claim 20 further comprising driving said first set of fasteners and said second set of fasteners at different angles to said first chord.

22. The truss manufacturing method of claim 20 further comprising passing said fasteners through a guide disposed between said first and second chords.

23. The truss manufacturing method of claim 20 wherein said step of pre-drilling pilot bores in said first chord further comprises pre-drilling pilot bores for installing said first set of fasteners at a first angle and subsequently pre-drilling pilot bores for said second set of fasteners at a second angle.

24. A method of manufacturing a structural truss module comprising a pair of chords comprising: positioning said chords in a jig assembly wherein said chords are disposed in parallel spaced relationship; driving a first set of fasteners through said first chord so that said fasteners threadably engage in said second chord and threadably engages in said first chord; driving installing a second set of fasteners so that said fasteners threadably engage in said second chord and threadably engage in said first chord; and removing said first and second chords and said installed fasteners from said jig assembly.

25. The truss manufacturing method of claim 20 further comprising installing a first set of fasteners at a first angle and installing a second set of fasteners at a second angle.

26. The truss manufacturing method of claim 24 further comprising passing said fasteners through a guide disposed between said first and second chords.

27. The truss manufacturing method of claim 24 further comprising pre-drilling pilot bores through an edge of the first chord at multiple angles at longitudinally spaced locations along said chord.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1A is a perspective view of a prior art floor joist constructed of dimensional lumber;

[0014] FIG. 1B is a perspective view of portions of prior art I-joist employed as a floor joist or truss;

[0015] FIG. 1C is a perspective view of a prior art metal plated open web truss mounted in a pre-construction phase;

[0016] FIG. 1D is a perspective view of a stack of prior art open web trusses;

[0017] FIG. 2 is a diagrammatic side elevational view of one embodiment of a roof or floor truss module;

[0018] FIG. 3 is a side elevational view, partly in section, of a roof or floor truss module installed at a construction site;

[0019] FIG. 4 is a perspective view of a roof or floor truss module;

[0020] FIG. 5 is an enlarged fragmentary view of the roof or floor truss module of FIG. 4;

[0021] FIG. 6 is a side elevational view of another roof or floor truss module;

[0022] FIG. 7 is an enlarged fragmentary sectional view, partly in schematic, of a roof or floor truss module;

[0023] FIG. 8 is an enlarged fragmentary sectional view of a roof or floor truss module;

[0024] FIG. 9 is an enlarged end view of a roof or floor truss module;

[0025] FIG. 10 is a perspective view illustrating a multiplicity of roof or floor truss modules installed on a pair of parallel support walls;

[0026] FIG. 11 is an enlarged side view of a fastener which may be employed in any of the roof or floor truss modules;

[0027] FIG. 12 is a schematic diagram illustrating the various possible fastener orientations for fasteners employed in various roof truss modules;

[0028] FIG. 13A is a side elevational view, partly in schematic, of a prior art shear wall diagram;

[0029] FIG. 13B is a side elevational view of a prior art wall diagram illustrating non-shear characteristics upon an application of a lateral force;

[0030] FIG. 14 is a side elevational view of a shear wall incorporating installed shear panels comprising structural truss modules employing a web of fasteners;

[0031] FIG. 15 is a side elevational view illustrating structural truss modules employed as vertical shear panels in a wall;

[0032] FIG. 16 is a perspective view of a wall incorporating shear panels comprising the structural truss modules of FIG. 15;

[0033] FIG. 17 is a side elevational view illustrating an installed header comprising a structural truss module with a web of fasteners;

[0034] FIG. 18 is a perspective view of the header wall assembly of FIG. 17;

[0035] FIGS. 19A-19D are annotated schematic views illustrating a representative manufacturing process for a representative structural truss module; and

[0036] FIGS. 20A-20D are representative perspective views of structural truss modules with a single web configuration, a double web configuration, a triple web configuration and a quadruple web configuration, respectively.

DETAILED DESCRIPTION

[0037] With reference to the drawings wherein like numerals represent like parts throughout the figures, a structural truss module is generally designated by the numeral 10. The structural truss module 10 can be constructed in a wide range of sizes and can provide a number of structural functions in an integrated construction, such as for a roof or floor truss assembly 100 illustrated in FIG. 10, a reinforced structural shear wall 200 illustrated in FIGS. 15 and 16 and a header structure for a wall 300 illustrated in FIGS. 17 and 18.

[0038] The structural roof or floor truss module 10 can be selectively configured in a number of standard heights H, such as 7, 9, 11, 14, 16 and 18 inches, and various lengths L as dictated by a given application. The structural truss module 10, in accordance with the present disclosure, allows for the ability to custom construct the module having specific dimensions as required.

[0039] In one preferred form of the structural truss module as a roof truss or a floor joist, the structural truss module 10 functions as a ready replacement for a dimensional lumber-type floor joist as represented in FIG. 1A, an I-joist such as represented in FIG. 2B, or an open web roof or floor truss assembly such as represented in FIG. 1C. The features of the structural truss assembly allow for construction of the structural truss module as required and allow for efficiencies over a prior art representative load of stacked roof trusses, such as illustrated in FIG. 1D, by effectively replacing the latter with a compact load of wood chords and a pallet of fasteners, as will be described below.

[0040] With reference to FIGS. 2, 4, 5 and 9, a representative structural truss module 10 suitable for a truss is constructed from a pair of wood chords 20 and 22 which are joined by a web 30 comprising a matrix of metal fasteners 40. The chords may be 23, 24 or other structural lumber components having a desired length L. The fasteners 40 are dimensioned in accordance with the desired height H of the truss. For a given truss, the fasteners 40 are preferably identical although identical fasteners are not required. For a given truss module, the lengths L of the chords are preferably equal although equal lengths for chords 20 and 22 are not required. Alternatively, the chords need not be oriented in the 2 direction as illustrated, but may essentially assume a 32 or 42 orientation.

[0041] With reference to FIG. 7, the fasteners 40 are elongated screws having a head 42 for receiving a high drive torque, a first threaded port 44 generally adjacent the head, an unthreaded medial portion 45, a second threaded portion 46 adjacent the distal end, and a tip 48 which facilitates penetration into the wood chords. In one configuration, the fasteners 40 are oriented at an angle of approximately 45 to the chord 20, and are drilled from the bottom chord 20 to the top chord 22 at the pre-determined angle. Upon the final installation, the first threaded portion 44 threadably engages the lower chord 20 and the second threaded portion 46 threadably engages the upper chord 22. Naturally, the upper and lower designations are arbitrary. The thread tips 48 preferably terminate approximately one inch to one and a half inches below the upper edge of chord 22. In one manufacturing process, a pilot bore 21 is pre-formed in the chord 20 at the given angle for each fastener.

[0042] In certain embodiments, the fastener matrix comprises a series of fastener pairs 50. The fastener of each pair is oriented so that the central axes of the fasteners essentially intersect at the top edge 24 of chord 22 (FIG. 7). The fastener tips 48 never engage. It is desired that the head 42 be seated below the bottom edge 26 of chord 20 approximately at a one inch to a one and a half inch spacing from the edge. For a given chord, the spacing is preferably uniform.

[0043] As best represented in FIG. 9, the fasteners are driven and disposed on the center lines of the chords and generally transversely aligned along the length of the chord. In one configuration, as best illustrated in FIGS. 2 and 4, at the ends of the chords, one fastener 40 is driven at a vertical angle or 90 angle to the chords.

[0044] A representative manufacturing method for a representative structural truss module 510 is schematically illustrated in FIGS. 19A-19D. A jig assembly 500 employs a reference shoulder 502 and a plurality of jigs 504 for securing a first chord 522 at a fixed position. A second set of jigs 506 secure a substantially identical second chord 520 at an opposed second position equidistantly spaced from the first chord.

[0045] Multiple guides 508 are disposed in fixed position between the chords to provide the proper entry angle for the fasteners 540. In one embodiment, the guides 508 are angularly adjustable and adapted to be fixed at the selected angular position. A drill 515 or a series of drills 515 are activatable to drill a pilot bore in the bottom chord 520 at the given angles illustrated. It will be appreciated that some of the pilot bore formations are done sequentially because of the angular relationships of the pilot bores for the truss module 510.

[0046] As best illustrated in FIG. 19B, a first set of fasteners 540 is installed by a torque driver 517 driving the fasteners through the pilot bores at a first angle, and at a right angle on one end as illustrated so that the fasteners 540 are threadably engaged in the first chord 522 and threadably embedded in the second or bottom chord 520. The driving of the fasteners can be done concurrently. In a preferred embodiment, the head 542 of each fastener is driven into the chord 520 a pre-established distance from the edge 526. The end fasteners may have a shorter length than the fasteners driven at an angle. Fasteners 540 preferably have substantially the same geometry as fasteners 40.

[0047] With reference to FIG. 19C, a second set of fasteners is then driven through the other pilot bores and the 90 pilot bore so that the head 542 of each fastener is embedded in the second chord and the fasteners threadably engage the first chord. Again, the driving of the second set of fasteners 540 may be accomplished concurrently.

[0048] Once the second set of fasteners has been driven, the constructed truss module 510 is then removed from the jigs. The finished structural truss module 510 is illustrated in FIG. 19D.

[0049] As best shown in FIG. 8, in one embodiment, the vertically oriented fastener is driven initially through the bottom edge 26. The next fastener in the web array is initially driven through the top edge 24 and the third fastener in the web array is initially driven through the bottom edge 26. Alternatively, the fasteners may be driven from the same edge or non-alternating edges. The fasteners may be driven at various angles and orientations relative to the chords, as schematically suggested in FIG. 12. Preferably, the web is formed by a series of angled quasi-convergent pairs 50 of fasteners.

[0050] Another suitable fastener 40 is illustrated in FIG. 11 and comprises a drive head 42 which receives a drive torque, a threaded portion 44 adjacent the head and a second threaded portion 46 adjacent the distal end extending to the tip 48. A medial portion 45 of substantial extent is not threaded. The unthreaded portion 45 extends a greater distance than that of portion 45, and the threaded portions 44 and 46 extend a smaller distance than threaded portions 44 and 46. Naturally, other fasteners may be employed. The fasteners for a given truss module need not be identical.

[0051] With reference to FIGS. 20A-20D, single, double, triple and quadruple representative structural truss module embodiments are shown as 610A, 610B, 610C and 610D, respectively. For structural truss module 610A, an array of single fasteners 640 is employed and the fasteners preferably connect the wood chords 620 and 622 along a medial transverse line l of the chords.

[0052] Structural truss module 6106 employs groups 651, 652, 653, 654 . . . of pairs of parallel fasteners 640 which are preferably equidistantly threaded into the chords 620 and 622 at locations which are equidistantly spaced from a longitudinal medial line l through the chords.

[0053] Structural truss module 610C employs groups 661, 662, 663, 664 . . . of three parallel fasteners 640. A medial set of the fasteners engages the chords 620 and 622 at spaced locations along a medial line l. A second set of the fasteners are equidistantly spaced from the medial line and longitudinally offset from the first set, as illustrated.

[0054] As illustrated in FIG. 20D, structural truss module 610D employs groups 671, 672, 673, 674 . . . of four fasteners 640. Each of the groups of fasteners preferably engages the chords equidistantly spaced from the medial line l of the chords.

[0055] It will be appreciated that other structural truss module configurations are possible and that it is possible for a given truss module to employ one or more groups of two, three, four or a single fastener in a given truss module to provide the requisite structural strength. The illustrated modules 610A, 610B, 610C and 610D are intended to be representative and typically are longer and have many more fastener groups than depicted. The fasteners 640 preferably have a geometry substantially similar to fasteners 40 or 40.

[0056] The structural truss modules 10, 510, 610A and 610D have a number of features. Each module is relatively open and consequently provides enhanced space for accommodating mechanical and electrical systems. The metal fasteners combine to implement a construction which has a high degree of structural integrity. The structural truss modules 10 have superior fire damage characteristic by virtue of a favorable anti-burn rate since the web connection, which provides the principal support, is the last structure to be adversely impacted by fire.

[0057] The structural truss modules 10, 510, 610A and 610D have a very favorable weight and provide enhanced storage capabilities since the components are essentially the chords plus the fasteners, and the various extra weight and storage requirements for the additional wood components characteristic of conventional truss construction are not present.

[0058] The fastener web 30 construction is relatively straightforward and can be accomplished in an efficient custom manner which lends itself to essentially just-in-time construction. The fastener web structure provides a conducive structure for attaching the various electrical plumbing and mechanical components by plastic ties and other efficient low cost mounting hardware. The disclosed structural truss modules are also greener in the sense that the only wood required for the module is the chords. Finally, the structural truss modules have favorable cost characteristics because the fastening components are typically less expensive than the conventional wood/lumber support components. In addition, the manufacturing process is less labor intensive.

[0059] The structural truss components can be constructed in various lengths such as, for example, a smaller length for structural truss module 10a illustrated in FIG. 6, and in various configurations such as the flat truss 10b of FIG. 3 as mounted to support walls 60.

[0060] With reference to FIGS. 14-16, the structural truss modules 10 also have applicability as reinforcing panels for shear walls 200. In this context, the modules are oriented vertically. FIGS. 13A and 13B illustrate a prior art conventional shear wall which, upon subject to a lateral force, such as wood, tends to rotate. The incorporation of the structural truss modules reinforces the wall and tends to make the wall resistant to application of a lateral shear force and consequent rotation as illustrated in FIG. 13B. FIGS. 15 and 16 illustrate an alternative implementation of the structural truss module 10 to construct the shear wall 200.

[0061] With reference to FIGS. 17 and 18, the structural truss module 10 also can be employed as a header over a window or doorway 310 or other structure for wall 300. In this regard, the module has a horizontal orientation. The construction of the module can be custom completed for a given construction application. Again, the header provides enhanced support. Due to its openness, the structural truss module 10 header provides improved thermal capabilities by enhancing the insulation and airtightness of the construction as a consequence of inserting insulation materials into the open structure of the module.

[0062] Naturally, truss modules 610A-610D may also be employed for support walls, shear walls and headers.

[0063] While preferred embodiments of the foregoing modules and integrated structures have been set for purposes of illustrating preferred embodiments, the foregoing description should not be deemed a limitation of the invention herein. Accordingly, various modifications, adaptations and alternatives may occur to one skilled in the art without departing from the spirit and the scope of the present invention.