CA2950477C - Blast panel assembly - Google Patents

Blast panel assembly Download PDF

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Publication number
CA2950477C
CA2950477C CA2950477A CA2950477A CA2950477C CA 2950477 C CA2950477 C CA 2950477C CA 2950477 A CA2950477 A CA 2950477A CA 2950477 A CA2950477 A CA 2950477A CA 2950477 C CA2950477 C CA 2950477C
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CA
Canada
Prior art keywords
sheets
laminate
metal
plywood
panel assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CA2950477A
Other languages
French (fr)
Other versions
CA2950477A1 (en
Inventor
Hugh A. Dantzer
Khaled El-Domiaty
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stone Protective Solutions LLC
Original Assignee
Stone Protective Solutions LLC
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Filing date
Publication date
Application filed by Stone Protective Solutions LLC filed Critical Stone Protective Solutions LLC
Priority to CA2950477A priority Critical patent/CA2950477C/en
Publication of CA2950477A1 publication Critical patent/CA2950477A1/en
Application granted granted Critical
Publication of CA2950477C publication Critical patent/CA2950477C/en
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/14—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
    • B32B3/22—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side of spaced pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
    • E04C2/12—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of solid wood
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/38—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure with attached ribs, flanges, or the like, e.g. framed panels
    • E04C2/384—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure with attached ribs, flanges, or the like, e.g. framed panels with a metal frame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/013—Mounting or securing armour plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/045—Detonation-wave absorbing or damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment

Abstract

A blast panel assembly includes a laminate formed of a plurality of glued together sheets of plywood mounted in a metal frame.

Description

BLAST PANEL ASSEMBLY
This invention relates to a blast resistant panel assembly.
Blast resistant panels are by no means new. One form of blast panel consists of heavy steel or iron panels. Other impact resistant panels are described in US
Patents Nos. 4,242,406, issued to El Bouhnini et al on December 30, 1980, 6,699,575, issued to Habil J. Dagher et al on March 2, 2004, 7,406,806, issued to Gerald Hallissy et al on August 5, 2008 and 8,596,018, issued to Habib J. Dagher et al on December 3, 2013.
The panel described in the Bouhnini et al US Patent No. 6,119,422 includes layers of gypsum board bonded together with an adhesive mesh.
The Dagher et al US Patent No. 6,699,574 discloses a wood sheathing panel incorporating strips of fiber reinforced polymer in the perimeter or corners of the panel.
The strips cover an area of 5-50 percent of surface area of the panel.
The Dagher et al US Patent No. 8,596,018 discloses a blast panel comprising a wood member having a compression side and a tension side. The tension side of the wood number is coated with a layer of fiber reinforced polymer.
The blast panels described in the above-listed patents would be expensive to manufacture, because they incorporate at least two materials, one of which is a polymer or plastic.
An object of the present invention is to provide a relatively simple blast panel, which is inexpensive and easy to produce.
In its simplest form, the invention relates to a blast panel comprising a plurality of sheets of plywood, which are laminated by gluing the sheets together.
Preferably, the laminated sheets are mounted in a metal frame.

BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described below with reference to the accompanying drawings, which illustrate a preferred embodiment of the invention, and wherein:
Figure 1 is a schematic isometric view of the blast panel assembly as viewed from the rear and above;
Figure 2 is a schematic, cross-sectional view of a bottom portion of the blast panel of Fig. 1; and Figure 3 is an exploded, isometric view of a plywood panel laminate used in the blast panel assembly of Figs. 1 and 2.
With reference to Figs. 1 and 2, the basic elements of the blast panel assembly include a hollow rectangular frame indicated generally at 1, strips 2 of angle iron and a plurality of laminated sheets 3 of plywood.
The frame 1 is defined by four square cross section steel tubes 4 which are welded together to form a rectangle. The frame 1 need not be rectangular, it could be circular, triangular or any other shape. The strips 2 of angle iron are welded to the inner sides of the frame 1 and to each other, forming a rectangular bracket inside of the frame 1. The plywood sheets 3 are connected to the angle iron strips 2 by carriage bolts 5 extending through the angle iron strips 2 and the laminated plywood sheets 3, and nuts 6. The frame 1 can also be formed by U-shaped channel members (not shown).
As best shown in Fig. 2, the plywood sheets 3 are laminated by gluing them together with a continuous layer 8 of multi-purpose glue. A suitable glue is Lapage multi-purpose glue. The sheets 3 are preferably three-quarter inch select grade
2 plywood. The sheets 3 are laminated so that the joints 10 between the stacked sheets of one layer 7 are not aligned with the joints 10 between the next layer 7. As will be appreciated by a person skilled in the art to which the present invention relates, the sheets 3 can be stacked so that their long edges are horizontal, or the sheets can be arranged side by side with their long edges vertical so long as the abutting edges of the sheets forming one layer 7 are out of alignment with the abutting edges of the sheets in any adjacent layer 7. When using standard 4' x 8' sheets of plywood, one of the sheets (in this case the top or bottom sheet) is cut in half lengthwise before laminated the sheets, and the arrangement of the sheets in the next layer 7 is reversed from top to bottom. Thus, alignment of the joints 10 between sheets 3 in adjacent layers 7 is avoided. With the arrangement of sheets 3 shown in Fig. 3, if one sheet of plywood is cut lengthwise in the middle, the result is two 2' x 8' sheets which are used to form the top end of one layer 7 and the bottom end of an adjacent layer 7. The resulting laminate of sheets will have dimensions of approximately 10' in height and 8' in width.
Tests were conducted on a panel assembly in accordance with the invention including a laminate of nine layers of three-quarter inch plywood sheets. The laminated plywood sheets 3 had three-quarter inch bolt holes drilled at six inches apart along the vertical edges of the nine sheet 8' x 8' laminate for mounting in steel framing elements.
Test loads were developed by detonating two batches of ammonium nitrate/fuel oil using bulk industrial explosive mixture. Each shot used a different explosive weight and standoff from the test specimen. Five pressure gauges were mounted on the steel plates on the front of the reaction structure surrounding the specimen. Two laser-based displacement readers were positioned along the vertical center line of the panel for
3 each test. The ranges of gauge readings recorded for positive phase pressure and impulse are presented in Table 1.
Table 1 Test Number Pressure in psi Impulse in psi-ms (kPa) (kPa-ms) 1 33-35 (230-240) 90-103 (620-710) 2 25-28 (170-190) 96-123 (660-850) The maximum displacement of the panel did not exceed 0.4 inch (10 mm) for either test within the first 150 ms of recorded responses. No permanent panel deformation was observed in either case during post-test inspection, i.e., the panel returned to its original pre-test position as a result of an elastic response.
Accordingly, it is reasonable to expect that assemblies with a similar laminate thickness and span can likely sustain significantly higher blast loads than those tested without permanent deformation. The panels can potentially take even higher loads where permanent panel deformation is acceptable, e.g., where panels are to be subjected to a one-time blast event and only need to sustain capacity to allow for personnel egress.
4

Claims (7)

What is claimed is:
1. A blast panel assembly comprising:
a plurality of sheets of plywood glued together to form a laminate;
a metal frame surrounding the laminate, wherein the metal frame includes:
a metal outer frame comprising permanently connected frame members, and metal brackets permanently attached to the metal outer frame;
a plurality of spaced apart bolts extending completely through the metal brackets and the laminate; and nuts on said bolts securing the laminate to the metal frame.
2. A blast panel assembly comprising:
a plurality of sheets of plywood glued together to form a laminate;
a metal frame surrounding the laminate, wherein the metal frame includes:
a metal outer frame comprising permanently connected frame members;
a plurality of spaced apart bolts extending completely through the metal outer frame and the laminate; and nuts on said bolts securing the laminate to the metal frame.
3. The blast panel assembly of claim 1 or 2, wherein each layer of the laminate is formed by a plurality of sheets of plywood with abutting edges.
4. The blast panel assembly of claim 3, wherein the abutting edges of the sheets of plywood in one layer are out of alignment with the abutting edges of the sheets of plywood in any adjacent layer of the laminate.
5. The blast panel assembly of claim 1, wherein said outer frame includes square cross section metal tubing surrounding said sheets of plywood; and said brackets include angle iron strips on an inner side of the tubing, said bolts extending through said strips and said plywood sheets for connecting the sheets to the angle iron strips.
Date Recue/Date Received 2023-05-16
6. The blast panel assembly of claim 2, wherein said outer frame includes metal channel members of U-shaped cross section for receiving said sheets of plywood, said bolts and nuts connecting said sheets of plywood to said metal channel members.
7. The blast panel assembly of claim 4, wherein the laminate includes nine layers of three-quarter inch select grade plywood, whereby the assembly is capable of withstanding blast loads of 25-35 psi and impulses of 90-123 psi-ms.

Date Recue/Date Received 2023-05-16
CA2950477A 2016-12-02 2016-12-02 Blast panel assembly Active CA2950477C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2950477A CA2950477C (en) 2016-12-02 2016-12-02 Blast panel assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2950477A CA2950477C (en) 2016-12-02 2016-12-02 Blast panel assembly

Publications (2)

Publication Number Publication Date
CA2950477A1 CA2950477A1 (en) 2018-06-02
CA2950477C true CA2950477C (en) 2023-11-21

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ID=62239830

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2950477A Active CA2950477C (en) 2016-12-02 2016-12-02 Blast panel assembly

Country Status (1)

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU201592U1 (en) * 2020-08-05 2020-12-22 Владимир Вячеславович Семьянов Explosion Proof Sandwich Panel

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