Structure forming method and apparatus

Abstract

A method of forming a continuous composite structure includes the steps of mixing a solid particulate resin forming material with a liquid resin forming material suuplied from nozzles (39) and applying the mixture to a porous blanket or blankets (44). The solid particulate material is liquefied with resin liquefying means (49) and reacted with the liquid resin forming material in an exothermic reaction. The blanket (44) is deposited along a preselected final surface with a pressing means (53) and part of the resin forming mixture is migrated through the blanket (44) substantially uniformly to form a continuous resin blanket.

Description

[0002] This invention relates to a novel continuous structure forming method and apparatus. The present invention provides a novel method and apparatus which overcome the shortcomings of previous expedients. In addition, the method and apparatus provide features and advantages not found in earlier technology. The method and apparatus of the invention can be modified to form a variety of structures of high quality.

[0003] A novel method of the present invention for forming a substantially continuous composite structure includes the steps of preselecting a solid particulate reactive resin forming material, a liquid reactive resin forming material and a porous blanket. The solid particulate reactive resin forming material is mixed with the liquid reactive resin forming material to form a stable liquid mixture.

[0004] The liquid mixture is applied to the blanket and the solid particulate resin forming material therein is liquified. The liquified resin forming material is reacted with the liquid resin forming material in an exothermic reaction.

[0005] The mixture-treated blanket is deposited along a preselected final surface. Part of the resin forming mixture is migrated through the blanket substantially uniformly to form a continuous resin matrix within the blanket. A tight permanent bond is formed between the matrix/blanket and the preselected final surface.

[0006] The solid particulate resin forming material may be liquified before or after the treated blanket is applied to the final surface. Advantageously, the liquifying of the solid particulate resin forming material is accomplished by heating it.

[0007] A preselected tension preferably is created in the blanket as it is advanced into contact with the final surface. Advantageously, pressure is applied to the treated blanket to form the permanent bond.

[0008] The mixture-treated blanket preferably is cut into predetermined lengths and a plurality of the treated blanket lengths arranged successively in a preselected overlapping relationship to form a continuous structural assembly of considerable length.

[0009] Benefits and advantages of the novel method and apparatus of the present invention will be apparent from the following description of the accompanying drawings in which:

[0010] FIG. 1 is a view in perspective of one form of continuous structure forming apparatus of the present invention;

[0011] FIG. 2 is an enlarged fragmentary side view of the structure forming apparatus of the invention shown in FIG. 1;

[0012] FIG. 3 is a schematic illustration of the structure forming apparatus of the invention shown in FIG. 1 in use;

[0013] FIG. 4 is a schematic illustration of an alternate form of the structure forming apparatus of the invention shown in FIG. 3 at a later stage of use;

[0014] FIG. 5 is an enlarged schematic illustration of the grasping portion of the structure forming apparatus of the invention; and

[0015] FIG. 6 is a fragmentary schematic illustration of an alternate form of the structure forming apparatus of the invention.

[0016] As shown in the drawings, a novel continuous structure forming apparatus 11 of the present invention includes a supporting portion 12, a material supplying portion 13, a matrix forming portion 15, a positioning portion 16 and a control portion 17.

[0017] The supporting portion 12 of the structure forming apparatus of the invention includes a plurality of spaced upstanding frame members 20,21,22,23. A plurality of frame members 25,26,27,28 join the frame members 20-23 to provide a frame assembly 29. The supporting portion 12 advantageously includes connector means 31 as well as accessories such as electrical generators, air compressors, hydraulic pumps, etc. (not shown). Such accessories can be mounted on and/or suspended from the frame members.

[0018] The material supplying portion 13 of the apparatus 11 includes a reservoir 32 operatively connected with the supporting portion 12. The reservoir is connected with the matrix forming portion 15, preferably through conduit means 37.

[0019] The matrix forming portion 15 of the apparatus 11 includes mixture distributing means 45 adjacent a delivery conduit 37 of the reservoir and adjustable downwardly therefrom. The mixture distributing means 45 as shown in the drawings includes a pair of spaced elongated transversely disposed arcuate members 47,48 with generally horizontal lower edges adjustably oriented closer together than upper edges thereof.

[0020] The matrix forming portion 15 also may include second mixture distributing means (not shown) adjacent the first mixture distributing means 45. The second mixture distributing means may include a plurality of spaced nozzles or other distributing means.

[0021] The positioning portion 16 of the structure forming apparatus of the invention includes resin liquifying means 49. As shown, the liquifying means may include heating means employing conductive rods, wires, etc. utilizing conventional or microwave energy. Liquifying of the resin may be done prior to application to the final surface (FIG. 3) or after as shown in FIG. 6.

[0022] Advantageously, the positioning portion 16 includes elongated structure grasping means 55 mounted on a vehicle 35. The structure grasping means preferably is mounted along the side of the vehicle adjacent to the apparatus 11. The grasping means 55 most preferably includes cooperating hinge sections 56 extending from pivotable link members 58. The operation of the grasping means is coordinated with the operation of the apparatus 11.

[0023] Pressure applying means shown as pivotable pressure roller 53 is extendable beyond an edge 54 of the apparatus. A cutter blade 60 advantageously is disposed on a pivoting arm member 61. The blade preferably is engageable with a roller such as pressure roller 53 disposed on an adjacent pivoting arm member 62.

[0024] The apparatus 11 may include removable outer panels 63 selectively hung from the apparatus to enclose the apparatus during storage. Also, the panels help to control wind, temperature, other weather conditions, etc. during operation.

[0025] In the formation of a substantially continuous composite structure with the apparatus 11 of the invention as shown in the drawings, the structure forming apparatus is suspended from a cantilever extendable arm assembly 65 extending from a 360 degree rotatable turntable on a vehicle 35 such as an excavator tractor, truck, trailer or the like. The machinery is transferred to a job site and positioned adjacent to a previously selected starting position.

[0026] Operation of the structure forming apparatus 11 is begun by preselecting a solid particulate reactive resin forming material, a liquid reactive resin forming material and a porous blanket. The solid particulate and liquid reactive resin forming materials preferably are mixed in advance at their fabricating site since the resulting mixture is stable. This procedure simplifies the design and operation of the structure forming apparatus 11.

[0027] The mixture delivered from outlet 40 of the reservior 32 passes downwardly between elongated arcuate members 47,48 into contact with a porous blanket or blankets 44 moving therethrough. The mixture is delivered at a rate sufficient to form a residual pool 46 between the arcuate members.

[0028] As the leading edge 68 of blanket 44 exits the liquid pool with the arcuate members closely adjacent to the preselected final location, the leading edge is grasped by cooperating hinge sections 56 as shown in FIG. 3 and advanced substantially immediately into permanent contact with a preselected edge 66 of ditch 67 and adhered thereto.

[0029] With the leading edge 68 in permanent contact with the ditch edge, the apparatus 11 including the arcuate surfaces which is suspended from the cantilever arm assembly 65 of vehicle 35 is withdrawn and the blanket being delivered therefrom is deposited along a preselected path across the ditch surface while migrating part of the resin forming materials through the blanket substantially uniformly to form a continuous resin matrix within the blanket.

[0030] Uniform tension is maintained by adjusting the relative speed of the apparatus across the ditch surface. During this interval, roller 53 applies pressure to tightly bond the structure to the ditch surface 69. Blade 60 then is pivoted against roller 53 to cut the blanket into a preselected length (FIG. 4).

[0031] Thereafter, the apparatus 11 may be moved to a position adjacent to and slightly overlapping the blanket deposited previously. The steps of the method are repeated to deposit additional lengths of the structure individually in an overlapping relationship with the previous structure length and thereby form a continuous structural assembly of considerable length. Since each length is maintained under tension until installed into the ditch, the structural liner produced is uniform and smooth without folds or other imperfections.

[0032] To produce high quality continuous composite structures of the invention, it is important that all of the steps of the method be carefully coordinated by control portion 17. The control portion 17 of the structure forming apparatus 11 of the invention includes programmable memory means 72 and actuating means 73 responsive thereto in combination with coordinating means 74 to control the operation of the various components of apparatus 11. Preferably, the coordinating means includes a process controller 75 that initiates changes in the flows of materials and speeds of drives to bring variations therein back to the rates specified in the programs present in the memory 72. Advantageously, the control portion may control the lateral position of the blanket 44 with respect to a preselected path.

[0033] This coordination commonly is achieved through the transmission of information such as digital pulses from monitors and/or sensors at the control components to the process controller 75. The operating information is compared with the preselected programming parameters stored in the memory 72. If differences are detected, instructions from the controller 75 change the operation of the components to restore the various operations to the preselected processing specifications.

[0034] The reactive resin forming materials employed to produce composite structures of the invention are selected to provide a particulate resin forming material that is a solid at ambient temperatures and a liquid resin forming material that is compatible with the liquified solid particles and capable of reaction therewith to form the particular resin matrix or coating desired in the final structure. Advantageously, the materials form a thermosetting resin such as a polyurethane or polyester.

[0035] Should a polyurethane be desired, the solid particles preferably mixed with the liquid resin forming material at the fabrication site so that a single supply of the resin forming material may be utilized. Additional components can be premixed with the resin formers, e.g. fillers, reinforcements, colors and the like.

[0036] If desired, the resin forming mixture may contain different partially formed materials which upon mixing interact to form the desired polyurethane. Examples of such partially formed materials include so-called “A stage” resins and “B stage” resins.

[0037] An inert particulate solid additive material may be mixed with the reactive resin forming materials, preferably, in a proportion significantly greater than that of the resin forming materials. The inert additive particles may be any of a wide variety of inexpensive materials readily available at a particular job site. Natural mineral particulate materials such as sand and gravel normally are available or can be produced simply by crushing rock at the site.

[0038] Also, materials such as waste or recycled materials which can be shredded or ground into particles of suitable size can be utilized. Especially useful are particles formed by shredding or grinding discarded tires. Since the particles are encapsulated with resin forming material and not saturated therewith, many different waste materials may be employed.

[0039] Suitable porous blankets include woven, knit, non-woven structures, etc. The blankets e.g. fabrics, mats, etc. may be formed of continuous or discontinuous fibers, yarns, slit ribbons and similar natural and synthetic fibrous materials. Reinforcing members such as ropes, cables, etc. extending longitudinally and/or transversely of the blanket centerline may be included if desired.

[0040] The above description and the accompanying drawings show that the present invention provides a novel method and apparatus which overcome the shortcomings of previous expedients and in addition, provide features and advantages not found in earlier technology. The method and apparatus can be modified to form a variety of different structures of high quality.

[0041] It will be apparent that various modifications can be made in the particular method and apparatus described in detail above and shown in the drawings within the scope of the present invention. Components and procedures employed can be changed to meet specific process and structural requirements.

[0042] These and other changes can be made in the method and apparatus of the invention provided the functioning and operation thereof are not adversely affected. Therefore, the scope of the present invention is to be limited only by the following claims.

Claims

1. A method of forming a continuous composite structure including the steps of preselecting a solid particulate reactive resin forming material, a liquid reactive resin forming material, and a porous blanket, mixing said solid particulate reactive resin forming material with said liquid reactive resin forming material, forming a stable liquid mixture thereof, applying said liquid mixture to said porous blanket, liquifying said solid particulate reactive resin forming material, reacting said liquified reactive resin forming material with said liquid reactive resin forming material in an exothermic reaction, depositing said blanket along a preselected final surface, migrating part of said resin forming mixture through said blanket substantially uniformly to form a continuous resin matrix within said blanket and forming a tight permanent bond between said matrix/blanket and said preselected final surface.

2. A method of forming a continuous composite structure according to claim 1 wherein said solid particulate resin forming material is liquified before said treated blanket is applied to said final surface.

3. A method of forming a continuous composite structure according to claim 1 wherein said solid particulate resin forming material is liquified after said treated blanket is applied to said final surface.

4. A method of forming a continuous composite structure according to claim 1 including liquifying said solid particulate resin forming material by heating.

5. A method of forming a continuous composite structure according to claim 1 including the step of creating a preselected tension in said mixture-treated blanket before adhering said blanket to said final surface.

6. A method of forming a continuous composite structurre according to claim 1 including the step of applying pressure to said mixture-treated blanket while it is in contact with said final surface to form a tight permanent bond therebetween.

7. A method of forming a continuous composite structure according to claim 1 including the step of cutting said mixture-treated blanket into a predetermined length as it is advaanced into contact with said final surface.

8. A method of forming a continuous composite structure according to claim 7 including arranging a plurality of mixture-treated blanket lengths in an overlapping relationship to form a continuous structural assembly of considerable length.

9. A method of forming a continuous composite structure according to claim 8 including the step of arranging each successive mixture-treated blanket length with a preselected degree of overlap.

10. Continuous structure forming apparatus including a supporting portion, a material supplying portion, a matrix forming portion, a positioning portion and a control portion; said supporting portion including a plurality of spaced upstanding frame members, a plurality of generally horizontally disposed frame members joining said upstanding frame members said supporting portion including connector means adjustably suspending said apparatus closely spaced a precise distance above a preselected final surface; said material supplying portion including a reservoir operatively associated with said supporting portion; said matrix forming portion including mixture distributing means extending adjustably downwardly from said reservoir; said positioning portion including heating means disposed closely adjacent to said mixture distributing means; said control portion including programmable memory means, coordinating means, sensing means, actuating means, and circuitry transmitting signals from said sensing means to said coordinating means for comparison with said memory means and activation of said actuating means to form and place a continuous structure into a preselected final configuration while it is flexible and adhesive.

11. Continuous structure forming apparatus according to claim 10 wherein said connector means is connectable to an extendable cantilever support arm assembly.

12. Continuous structure forming apparatus according to claim 10 including pressure applying means including an elongated roller.

13. Continuous structure forming apparatus according to claim 10 wherein said supporting portion includes support members for spare blanket rolls adjacent said material supplying portion to facilitate substantially continuous operation of said apparatus.

14. Continuous structure forming apparatus according to claim 10 wherein said mixture distributing means includes a plurality of spaced spray nozzles.

15. Continuous structure forming apparatus according to claim 10 wherein said control portion includes means controlling the lateral position of said apparatus with respect to a preselected path.

16. Continuous structure forming apparatus according to claim 10 including means to accommodate the processing of different width structures.

17. Continuous structure forming apparatus according to claim 10 wherein said supporting portion includes removable outer panels.

18. Continuous structure forming apparatus according to claim 10 including separable drive means and supply means.

19. Continuous structure forming apparatus according to claim 18 wherein said drive means includes a 360 degree pivotable and extendable cantilever support frame section.

20. Continuous structure forming apparatus according to claim 18 wherein said separable drive means includes a vehicle.