Abstract: An apparatus and method for the rapid perimeter screed bulkhead forming of concrete tilt-up wall panels are provided. The apparatus includes a unitary formboard support, a formboard, and a fastener. The unitary formboard support includes a base, which includes a fastener passageway through the base, and two upright walls connected to the base, which form an open channel. The unitary formboard support can be attached to a casting surface or concrete floor by the fastener which passes through the fastener passageway and secures the unitary formboard support. The bottom end of the formboard is fit within the open channel of the unitary formboard support and held in position by the upright walls.

Abstract: Method and arrangement for casting structures using form-work is disclosed applicable but no limited to on-site casting concrete construction panels for subsequent erection. Set back from form-work location are set-back buttresses (11) fixed to the work site surface. The set-back buttresses (11) support sliding risers (25-29) which can be secured in place relative to the set-back buttresses (11) and released and moved to and from the form-work location. The sliding risers (25-29) support form-work at the form-work location. A plurality of sliding risers (25-29) can be supported by the set-back buttresses (11) one above the other. In this way side-forms can be supported for structures of complex vertical profiles; for example, convex or concave walls, steps and stacks of construction panels may be moulded. Also disclosed are reusable side-forms which are supported by the sliding risers (25-29) and can be used as form work for construction panels.

Abstract: A side wall system for a concrete casting mould, including a side part (2, 3) which is removably attachable to a casting bed (1) by means of one or several magnets (7). The body (6) of the magnet part that carries the magnet (7) includes a pivoting shaft (10) about which the magnet part (6, 7) can be pivoted into a lower position wherein the magnet (7) is fastened to the casting bed (1) and into an upper position wherein the magnet is spaced from the casting bed. The side part (2, 3) includes a holder (5) on which the pivoting shaft (10) of the magnet part can be hung so that it can be pivoted between its lower and upper positions. The holder (5) has a mounting face to which the upper surface of the magnet (7) can be fastened by means of the magnetic force when the magnet is pivoted into its upper position about its pivoting shaft.

Abstract: A structural member, in particular for wall and ceiling shuttering, has a working surface and a structural frame on which the working surface is mounted; and frame members perpendicular to the working surface that form the structural frame. The working surface and the structural frame are formed integrally as an injection molded part.

Abstract: Systems are provided to contour hardenable construction material to resemble a natural stone wall. A gang form is provided for molding the natural stone surface having multiple stone regions. The gang form includes a plurality of form liners each including only one lateral relief mold face for contouring a single stone region on the wall formed against the lateral relief mold face. The form liners are mounted to a backing member in an adjacent mating relationship to create a continuous lateral relief mold face.

Abstract: A vibratory finishing machine includes a base having an upper face, coil springs mounted on the upper face of the base, a vibrator having an outer peripheral face and mounted on the base via the coil springs for vibration, a vibrating motor mounted on the vibrator, and a helical tubular container into which an admixture of workpieces to be finished and finishing media are loaded. The container has upper and lower flat superposed faces extending lengthwise and is helically wound on the outer peripheral face of the vibrator at a plurality of turns so that the upper and/or lower superposed faces of each turn of the container are superposed on the lower and/or upper superposed faces of the adjacent turn or turns respectively.

Abstract: A concrete wall panel for tilt-up construction provides polymeric peripheral elements defining panel and orifice edges and medial fastening strips extending in the panel between the peripheral elements, all of which remain as part of the finished panel to accept traditional self-penetrating nail, screw and staple fasteners historically used in wood construction. The peripheral elements are of solid configuration to provide a form for pouring plastic concrete that forms the panel embodying them. The fastening strips extend through the panel between opposed panel surfaces and are formed by two initially releasably interconnected elements defining voids therebetween to allow thickness adjustment and convenient placement and support of structural components within the panel. The fastening strips define spaced areas to receive traditional wood fasteners and may carry index strips on opposed exposed surfaces to visually indicate strip location and fastening areas.

Abstract: A flexible concrete form which can be arranged to provide both straight and curved configurations, and is adapted to flex both horizontally and vertically. The form includes a face panel and upper and lower flanges having lips on their back edges. An intermediate rib spaced below the upper flange provides a ledge on which a rigid core member can be installed to enhance the rigidity for straight areas. The upper and lower flanges have aligned openings for receiving stakes used to anchor the form to the ground. The form is preferably constructed from polyethylene, polyvinyl chloride, or polybutylene because of the strength and flexibility of these materials as well as their ability to release from concrete without the need for scraping or release agents.

Abstract: A metal form has a flexible panel member with a perimetral flange projected laterally from one side thereof. Each of a pair of transversely opposite side sections of the flange is segmented by a plurality of longitudinally spaced V-shaped notches having their apices adjacent the one side of the panel member to provide for a lateral flexing movement of the panel member to a preselected shape. With the panel member in the predetermined shape, the segments in each of the flange side sections are connected together against relative movement to retain the predetermined shape of the panel member. In a preferred embodiment, each flange segment is connected to an adjacent flange segment by a flexible metal strap.

Abstract: In a universal, reusable system for molding concrete or other settable fluids for use in building construction, an apertured composite plastic panel is provided for use in the framing system in which the plastic panel, rather than being of a honeycomb structure, includes a single face sheet which serves as a pour side surface, with an array of truncated pyramids having central apertures extending rearwardly from the back side of the sheet.

Abstract: A structural support for supporting a planar substrate, for example plywood, is provided with a screw receiving channel. The channel provides a guide simplifying screw attachment for a substrate to the support.

Abstract: A house may be assembled from a plurality of vertically-cast wall sections and produce an aesthetically pleasing, highly desirable home at reduced cost.

Abstract: A method of producing a cambered composite joist and concrete panel assembly, and the assembly so produced, comprising the steps of providing a negatively cambered casting mold, positioning at least one negatively cambered composite joist with a bottom chord joined to a web member having non-attached top apices into the mold such that the top apices rest within the mold, pouring concrete into the mold and allowing it to harden to form a cambered concrete panel with the joists extending from the panel, removing the assembly from the mold and inverting it such that the precast camber in the panel flattens out from the effects of the weight of the panel and creep during final curing.

Abstract: A ceiling construction, especially for a large area shuttering construction for reinforced concrete ceilings, has a plurality of ceiling panels laterally abutting to each other. On a main plate of the ceiling panel, U-profiled shackles are arranged in a row and are aligned with each other. The U-profiled shackles have a web, two legs extending from the web to the main plate and having free ends, and flanges formed extending outwardly at a right angle from the free ends and being screwed to the main plate. Isolated longitudinal bars are fixed by a welding connection in the corners formed by the webs and legs of the U-profiled shackle. The isolated longitudinal bars are located away from the main plate. The ceiling construction is covered with concrete. During the construction and concrete operation, the isolated longitudinal bars serve to transmit forces of pressure. In the completed, solidified state, the bars serve to transmit tensile forces.

Abstract: A concrete form liner includes a microporous membrane having pores that transmit water, but prevent the passage of particles with a diameter of 2 microns or greater, and a porous sheet having pores in the range of 0.2 microns to 60 microns on one side of the microporous membrane, the porous sheet having an air permeability at least five times greater than that of the microporous membrane. The form liner is permeable to air and water in a concrete mix, but is substantially impermeable to cement particles in the concrete mix. A drainage scrim may be juxtaposed against the side of the microporous membrane opposite the porous sheet.

Abstract: A beam member for use in construction, particularly as a waler in concrete form assemblies, and a method of producing the same. The beam member is flexible to a preselected curvilinear shape and adapted to be held in said preselected curvilinear shape, and includes a flexible face and a plurality of flange members secured to and upstanding from the flexible face, the flange members being arranged side-to-side in two rows, one each of which rows is adjacent a corresponding one of opposing sides of the flexible face. Each of the flanges has a terminal end section extended parallel to the flexible face and is separated from an adjacent flange by a distance which increases from the attachment of the flange at the flexible face to said terminal end section whereby the beam member is laterally flexibly movable to conform to a preselected curvilinear shape. A strap is secured to the terminal end section of the flanges to maintain the preselected curvilinear shape of the beam member.

Abstract: In a sludge treatment tank, members made of a glass long-fiber reinforced foamed plastic composite material are used as formworks in construction and then left as an inside wall member. The composite material functions as formworks in a construction method as well as applies an insulating property and a corrosion resistant property to the sludge treatment tank and further realizes labor saving in a field of construction works, the provision of a good working environment and the reduction of a period of construction work.

Abstract: A mold for casting ground covering, such as a plurality of stepping stones, has a generally polygon concrete molding frame having top and bottom surfaces in parallel planes and divided into openings. The frame is generally square and may include nesting polygonal configurations. Each wall has a plan shape of contiguous line segments connected at obtuse angles. A first diagonal wall extends approximately from the first corner to the third corner, and a second diagonal wall extends approximately from the second corner to the fourth corner. The first perimeter wall is geometrically congruent with the third perimeter wall and the second perimeter wall is geometrically congruent with the fourth perimeter wall. The diagonal walls are geometrically congruent with the second and fourth perimeter walls.

Abstract: A concrete form having a frame with a first pair of outer frame members and a second pair of outer frame members. The first pair of outer frame members are disposed perpendicular to the second pair of outer frame members so that the first and second pairs of outer frame members define a substantially rectangular shape. The concrete form has two inner frame members connected between two of the outer frame members, the inner frame members being spaced to define a rectangular bay area therebetween. The concrete form has a flat concrete-forming member fixed to the outer frame, and a support member with a pair of end portions and a middle portion disposed between the end portions. The support member is connected to the first and second inner frame members so that the middle portion of the support member is spaced from the concrete-forming member by a first distance and so that the end portions of the support member are spaced from the concrete-forming member by a second distance smaller than the first distance.

Abstract: A mold especially adapted for forming precast, waffle-shaped concrete panels employs a one-piece mold body of flexible plastic sheet material to which rigid side rails are secured by tongue and groove longitudinal joints. The mold may be rapidly stripped and reset due to a hinge action provided by partial sides of the flexible body to which the rigid side rails are joined. The side rails and other structural features provide a simple mold structure that may be readily and efficiently employed for on-site production of panels. The configuration of the side rails and associated joints facilitates the replacement of a wornout mold body. A cover may be placed over the mold body while the concrete cures and automatically lifted therefrom after a predetermined time to allow the concrete to cool. Recess formers and connector covers for the panels are provided for appearance and security.

Abstract: A wall form system for use in constructing a poured concrete wall includes a plurality of panels aligned in an edge-to-edge configuration to form spaced wall forms. The wall forms are maintained in a spaced relationship by a tie which includes a pair of cutouts which mate with notches in the side edges of each of the panels at the juncture between adjacent panels. A retainer is provided to secure each end of the tie to the outer face of the adjacent panels. After the concrete wall is poured and hardened, the wall forms are easily disassembled by breaking a first frangible section from the tie and removing the wall form panels and then breaking a second frangible section from the tie which is projecting from the concrete wall. The ties and retainers are disposable and easily assembled with the wall forms thereby alleviating the need for collection and retrieval when the wall forms are disassembled.

Abstract: An integrally molded concrete molding form member is made of a fiber-reinforced plastic and formed of a long flat front plate portion, a pair of horizontal side plate portions perpendicularly extending from cross-sectional ends of the front plate portion toward its back surface, and a horizontal pair of rear plate portions perpendicularly inwardly extending from forward ends of the side plate portions opposed to the back surface of the front plate portion. Each of the front plate portion, the side plate portions and the rear plate portions is provided with a plurality of mounting holes in the same longitudinal positions at prescribed intervals to facilitate connecting front, side, back, upper and lower surfaces.

Abstract: A hearth form is utilized for pour-forming a fireplace hearth in the absence of eventual removal thereof from an opening established by floor joists and a conventional concrete masonry unit. The hearth form is preferably constructed from two relatively slidable body portions which may be reinforced by inter-engaged parallel channels or grooves. The body portions collectively define a chamber or cavity into which concrete can be poured. A peripheral wall defined in part by side walls and front walls carry brackets for establishing a predetermined space between the hearth form and floor joists, not just for supporting the hearth form upon nails or fasteners and nail centering marks for establishing the location of fasteners to assemble the hearth form in an associated floor opening.

Abstract: A moldplate, defining first and second planar surfaces, is constructed to have a lift foot that supports a prefabricated panel for lifting and transport. The moldplate includes support tabs that attach to a lifting truss in a manner that positions one surface of the moldplate so that a vector normal to the mold surface has a horizontal component and an upward, vertical component to support the slabs during lifting and transport to a drying station. The moldplate can be positioned in spaced, confronting, generally parallel vertical relation to a fixed, planar surface with a peripheral sidewall positioned between the two surfaces, defining a void for receiving a pourable material to vertically form the prefabricated panel.

Abstract: There is provided a panel structure for the side walls of an inground pool, the panel having vertical lines of weakening formed therein permitting it to assume various arcuate configurations, both concave and convex. This arrangement permits a single panel to be used for both straight and curved wall sections.

Abstract: A form panel which facilitates the assembly and disassembly of the form, thereby insuring high economics and working efficiency. The form panel includes a reinforcing frame body (3) secured on a flat board (2) and on the back surface of the flat board, and flanges (29, 29) provided on the back part of the frame body.

Abstract: Systems and methods are provided to contour hardenable construction material to resemble a natural stone wall. Form liners are provided which each create at least a single stone portion on the resulting wall. A plurality of form liners are matable with each other and are further securable to a form to create a first mold member for forming the wall. The form liners include a first surface portion for contouring the hardenable construction material to resemble a stone. The form liners further include a second surface portion surrounding the first surface portion for creating mortar regions on the resulting wall.

Abstract: Formwork for surfaces varying in curvature has a face sheet adjustable with respect to its curvature, girders supporting the face sheet and applied to the girders, in spaced relationship to the face sheet, there is a boom system which is composed of individual boom members bridging the girders and is suitably attached to the girders at the outsides thereof averted from the face sheet. Adjustment of the curvature of the face sheet is carried out by altering the effective length of the boom members between the girders. The mutually opposed formwork elements are adapted to be braced together by means of formwork anchor ties. A crosspiece in the form of a boom member is applied to a formwork element at at least two girders and simultaneously serves as an abutment for the formwork anchor tie, the latter therefore being arranged between and having its reaction forces transferred to the two girders.

Abstract: The present invention is directed to a mold for forming concrete walkways or surfaces. The mold incorporates a plurality of openings for receiving concrete therein. The mold forms a single concrete slab having a simulated brick or rock pattern on it's surface. Concrete walkways are formed by placing the mold of the invention on a surface and pouring concrete in the openings. Upon removal of the mold, the concrete retains the pattern. The procedure is repeated to form a walkway of a desired length, width and configuration.

Abstract: A mould-form shuttering panel against which concrete is intended to be cast. The shuttering panel is wood based, such as plywood, wherein the side of the shuttering panel intended to lie in contact with the concrete includes an elastic layer which will not adhere to the concrete to any significant extent. The elastic layer is 1-5 mm in thickness and is applied to the plywood by a method including spraying the layer onto the plywood and then rolling a roller over the liquid coating.

Abstract: A concrete form a part of which is made of a fiber-reinforced thermoplastic resin, said fiber-reinforced thermoplastic resin satisfying the following conditions:Tt(C).gtoreq.Tt(M)-1.5.alpha.15.ltoreq.Tt(c)wherein Tt(C) (%) is total transmittance of the fiber-reinforced thermoplastic resin measured at the thickness of top board, .alpha. (% by weight) is fiber weight fraction of the fiber-reinforced thermoplastic resin, and Tt(M) (%) is total transmittance of the matrix resin measured at the same thickness as above.

Abstract: A modular building system for constructing the frame of a structure. Standardized foundation forms, vertical forms, and tie beam forms are attached to each other. The vertical forms are hinged so as to be capable of defining a corner of any angle. Cover plates are selectively inserted into the tie beam forms so as to define a reception recess which corresponds to the size of a roof truss being used. The various forms can be attached to each other with a minimal amount of labor.

Abstract: A form liner, for use in forming a wall having a natural stone wall contour from hardenable construction material, includes a first non-linear mating edge and a lateral relief mode face. The lateral relief mode face includes a plurality of interlocking contoured relief portions adapted to provide the natural stone wall contour. The interlocking contoured relief portions include first portions for forming interlocking contoured mortar regions and second portions for forming non-planar stone regions. A plurality of liners may be mounted adjacent one another to form a gang form liner wherein the non-linear mating edges of adjacent form liners are mated to form a continuous molding surface.

Abstract: Concrete forms utilizing a laminated concrete form liner including a porous fabric laminated to a drainage scrim. The laminated form liner is untensioned and used in combination with a support to form a concrete casting system wherein the porous fabric side of the laminated form liner is placed directly in contact with the concrete. The drainage scrim enhances the ability of the form liner to remove excess water from the surface of the concrete.

Abstract: A form for use in shutterings for the pouring of concrete has a panel with a marginal portion reinforced by a hollow frame having an outer wall which is normal to the panel and a second wall remote from the panel, integral with the outer wall and having one or more sockets for reception of the working end of a crowbar serving to lift and/or otherwise displace or reorient the form. Each socket can constitute a recess or an opening in the second wall. The second wall is or can be disposed between the outer wall and an inner wall which is parallel to the outer wall and extends to the rear side of the marginal portion of the panel. The second wall can be reinforced in the region where it is engaged by the working end of the crowbar in order to reduce the likelihood of deformation of the frame, particularly of the outer wall which contacts a support, abuts a ceiling or is in abutment with the frame of an adjacent form in an assembled shuttering.

Abstract: An object retention form liner is described for use in holding and transferring objects, such as thin bricks to the finished surface of concrete structures. The form liner is produced by strategically positioning a plurality of bricks in a face-up position in a flat, shallow mold. Recesses sized to fit the bricks can be provided in the surface of the mold with a sealing ridge provided between each of the recesses. The bricks are positioned in the recesses and a liquid elastomeric material is poured into the mold to cover the bricks. Reinforcing fiberglass mesh can be embedded in the elastomeric material to provide additional tensile strength to the liner. Upon setting, the liner and retained bricks are removed from the mold and the liner can be stored, shipped or used in concrete construction. The liners are attached to the inside surface of concrete forms and the bricks are held rigidly in place while the concrete is poured and sets.

Abstract: A slab joint form structure for pouring of a concrete slab with a continuous shear joint including a pair of longitudinally superimposed edge forms, a flat slab joint shear bar positioned in a generally horizontal plane and lying longitudinally between the superimposed edge forms and extending longitudinally thereof, the superimposed wedge forms being engaged with opposite sides of the flat slab joint shear bar, wedge brackets positioned in superimposed stacked relation, the wedge brackets being attached to the edge forms in superimposed aligned relation with the flat slab joint shear bar being between the superimposed brackets, the wedge brackets providing superimposed wedge pockets, a stake located in the superimposed wedge pockets for ground embedment, a locator positioned between one of the edge forms and the shear bar for positioning the shear bar in a proper fixed position relative to the edge forms and leaving an inner edge projected inwardly a predetermined selected distance beyond the closed sides of

Abstract: This invention pertains to a novel adjustable formwork system which can be used in the manufacture of a wide range of structurally efficient cross-sectional shaped concrete beams, columns and structures. A cast-in-place concrete beam form comprising: (a) at least two spatially oriented upper sleeves, with an upper web located on one side of the two sleeves, and extending therebetween; (b) at least two spatially oriented lower sleeves, with a lower web located on one side of the two sleeves, and extending therebetween; and (c) at least two members, each member connecting telescopically the respective upper sleeve with the respective lower sleeve, said telescoping members enabling the two upper sleeves to be raised or lowered relative to the two lower sleeves.

Abstract: Overall production line equipment is utilized in producing many large concrete panels, in an initial horizontal position, during each day of many operational days, with these panels preferably being later installed vertically with other like panels to form a sound barrier alongside a vehicle way. Each concrete panel has its own integral pilasters at respective edges, in turn having respective tongue and groove edges; respective patterns and color accents on each side, with the pattern on the then top side being formed by using a rockable stamp subassembly, mounted on a cart; reinforcing throughout the panels, inclusive of the integral pilasters; lifting subassemblies; and anchoring subassemblies, adapted to be later mated with a receiving subassembly anchored in a concrete footing, located where the panel with other panels forms a sound barrier alongside vehicle ways.

Abstract: A formwork panel has a face plate which is mounted on a frame made up of structural shapes. The panel is reinforced by a set of spaced, parallel reinforcing beams mounted on the back of the face plate. Additional beams are disposed between selected pairs of reinforcing beams. The additional beams are perpendicular to the reinforcing beams and are spaced from the frame. Each additional beam is provided with an opening which registers with a corresponding opening in the face plate. The registering openings receive tie rods which connect two facing formwork panels to one another so as to define a pouring space for concrete.

Abstract: A pour window for a metal concrete form flexible to a predetermined arcuate shape. A window panel of a generally rectangular shape forms part of a door which is pivotally mounted at one edge thereof for movement between an open and a closed position thereof. In the open position, concrete can be poured inside assembled forms intermediate the outside edges of the form assembly. In the closed position secured to structural members of the form, the window panel conforms to the generally arcuate shape of the form to present a substantially continuous arcuate surface for the forming of curvital concrete surfaces.

Abstract: A concrete form with provision for draining excess water and air from wet concrete by placing fabric over a grid on the support portion of the form. A patterned surface of increased hardness results from use of the form. One embodiment results in concrete with a completely smooth surface.

Abstract: Concrete forms utilizing a concrete form liner including a two-sided fabric having a different range of pore sizes on one side compared to the opposite side. In one embodiment, a microporous coating, such as an ethylene-vinyl chloride microfoam dispersion, is placed on one side of a porous fabric to controllably reduce the pore size of the fabric on that side to between 0.2 to 20 microns. The coated fabric is used in combination with a support and a grid to form a concrete casting system wherein the coated side of the fabric is placed directly in contact with the concrete. The microporous coating stabilizes the surface fibers of the fabric thereby reducing the tendency of the fibers to stick to the concrete. The pore size of the coated side of the fabric must be small enough to substantially keep all concrete particles from passing through the fabric, but sufficiently open to permit the passage of water and air.

Abstract: A formwork for a draft tube which includes ganged precast forms, each precast form corresponding to a curved segment of the draft tube. The precast forms are molded with continuous side plates extending thereabout and anchored in the precast concrete form and projecting beyond the surface opposite to the contact surface to provide a flange. A fastening means for attaching adjacent forms with a space therebetween to allow for stripping. A method includes determining the outline of the inner surface of the draft tube and dividing it into segments and preparing molds to make precast forms corresponding to each segment. The precast forms are assembled and shored to provide the draft tube ganged formwork, and concrete is poured about the draft tube formwork and is cured. The precast forms are stripped from the set concrete structure and reused in another draft tube formwork.

Abstract: A concrete construction form including a plurality of assembled sections each having a first smooth coffering surface and a rear surface reinforced by stiffening fins oriented perpendicularly to the rear surface with elongated reinforcement gutters extending along each stiffening fin and wherein transverse girders are connected to the fins by fasteners extending through the girders and into the open ends of the gutters.

Abstract: An assembly comprising a foam piece adapted for use in concrete casting, the foam piece having a front surface, a back surface, and edges, the assembly further comprising a flexible, non-permeable plastic film surrounding the foam piece. In one aspect of the invention, the plastic film surrounding the foam piece is heat shrunk. In another aspect of the invention, the foam piece defines a block out for use in concrete casting. The assembly may include a wood beam in a groove in the foam piece, which beam can receive nails so that the assembly can be secured to a concrete casting form. The plastic film allows the foam piece to be easily removed from hardened concrete and reused.

Abstract: A flexible reinforced concrete form line is provided which includes a plurality of elongated cuttable strips which are sized and embedded within the textured surface of the flexible form liner. The cross-sectional shape of the strips is substantially the same as the cross-sectional shape of the textured surface of the liner except smaller so that the thickness of the elastomeric material making up the liner is substantially constant throughout resulting in consistent expansion and contraction of the liner during setting of the concrete. The strips can be suspended within the liner during the elastomeric molding process or the strips can be directly attached to the plywood form backing sheet prior to the molding process. The total quantity of elastomeric material making up the liner can be greatly reduced which, in turn, reduces the weight of the overall form.

Abstract: A form assembly for casting a lining wall in an existing manhole includes a cylindrical lower form assembly, a circular horizontal form assembly, and a cylindrical upper form assembly. All three assemblies are formed of smaller segments which are assembled together within the manhole and which can be disassembled after the manhole has been repaired.

Abstract: A retainer device for holding objects within recesses provided on form liners which are attached to the inside surface of substantially upright concrete structural forms. The retainer device is attached to the form liner to hold the object against the liner so that after the concrete has been poured and set and the forms stripped, the objects will be exposed in the finished surface of the structure. Various retaining devices such as clips having enlarged heads and elongated stems with friction enhancing devices intended to be inserted or attached to the form liner so as to hold the clip in a secure relationship with respect to the objects. Another embodiment of the retainer device is a spring-biased clamp having a body encased within the form liner so that the clamp ends grip the sides of the object. In another embodiment, an elastic band is secured to the form liner ridge provided between recesses.

Abstract: There is disclosed a form liner having a thickness no greater than 0.5 inch and having planar dimensions of approximately 2 feet by 4 feet, with one of its planar surfaces having a molded negative impression of a desirable surface relief pattern for a concrete wall. The form liner is manufactured by processing pre-formed sheets or panels of expanded plastic foam, typically expanded polystyrene foam. These stock panels are obtained in approximately 3/8 inch thickness and a positive pattern of the desired relief is pressed into the panel under sufficient heat, about 200 degrees F. and pressure, about 2500 psi, to mold one of the smooth surfaces of the panel into a negative impression of the desired surface relief pattern. The molding can be accomplished in a standard compression equipment with cycle times of approximately ten seconds. This permits the inexpensive and facile manufacture of these panels at sites removed from the polystyrene foam expander plant.