Abstract: An internal form with exterior surfaces corresponding to the interior surfaces of the access chamber adapted to be contacted by corrosive gasses; spraying such exterior surfaces of the form with a release agent and allowing the release agent to cure; spraying the cured release agent with a first layer of gel coat having a first color and allowing the gel coat to cure; spraying the cured first layer of gel coat with a second layer of gel coat having a second color contrasting to the first color and allowing the second layer of gel coat to cure; spraying the cured second layer of gel coat with resin and chopped strands to form a first fiberglass coating; attaching half cylinder pockets to the first fiberglass coating; spraying the first fiberglass coating and pockets with resin and chopped strands to form a second fiberglass coating; rolling the second fiberglass coating to remove air bubbles and to improve the bonding between the layers and coatings; laying up metal reinforcing rods interior of the pockets and

Abstract: A modular cylinder comprises a plurality of, in this case 24, modules each having a tongue to engage a groove of its neighbor and each either having a camming ramp to engage a camming ramp of its neighbor, or a filler rod inserted between adjacent modules at each interface. Where the camming means are provided, (n-1) of the modules can be placed into engagement to define an almost complete cylinder and can then be strained in a radially outward direction to provide space for the final module which is placed in position by sliding longitudinally of the gap. Where the filler rods are used, all of the n modules may be loosely assembled in a first operation and the filler rods can be inserted in a second operation to pre-stress the cylinder.

Abstract: An insulating system for storage tanks uses vertical straps and horizontal cables to form a web on the outer surface of a spherical storage tank. Fasteners and clamps positioned at intervals along the vertical straps anchor the cables in place. Panel sections are positioned transversely to the horizontal cables, the panel sections having opposing side flanges that are folded over flanges on adjoining panel sections as well as the attachment means looped around the cable.

Abstract: A storage structure, particularly for fluids but also useful for storing solids, which in one embodiment includes at least a portion thereof comprising a structural wall having opposing sides, at least one said side having an insulating and protecting built-up layered finish covering which retards heat transfer, the passage of water vapor through the insulation and/or the condensation of water on the one said side, the built-up layered finish covering including a layer of insulation positioned on the one said side of the wall; a solid unitary vapor barrier layer applied to the outer surface of the insulation board as a viscous liquid or paste which hardens into a solid layer; a reinforced stucco basecoat layer applied onto the vapor barrier layer; and a stucco topcoat layer applied onto the stucco basecoat layer.

Abstract: Reinforced concrete columns wherein the exterior surface of the concrete column is wrapped with a composite reinforcement layer. The composite reinforcement layer includes at least one fabric layer which is located within a resin matrix. The fabric layer has first and second parallel selvedges which extend around the circumferential outer surface of the column in a direction substantially perpendicular to the column axis. Specific weave patterns are disclosed. The composite reinforcement layer provides a quick, simple and effective means for increasing the resistance of concrete columns to failure during the application of asymmetric loads.

Abstract: Structural wall reinforcement method and apparatus for reinforcing a wall comprising a plurality of post-tensioned cable assemblies and wire mesh embedded in a layer of concrete-like material for applying compressive forces to the wall.

Abstract: A method for applying a covering on a substrate consists in embedding a reinforcement (2) in a covering (10). To this end, a number of hooks (3) are fixed on the substrate (1), preferably with variable orientations and/or inclinations with respect to the substrate (1). The reinforcement (2) is inserted in the hooks (3) and the covering (10) is applied on the substrate (1) which carries the reinforcement (2).The hook (3) which is used as a fastening device is preferably formed by a substantially U-shaped rod, one arm (4) of which has a curvature which is reversed with respect to the curvature of the U-shaped base.The reinforced covering thus formed can in particular be a fireproof facing applied on a metal substrate.

Abstract: A storage vault (2, 182) includes an inner tank (4,4',152,180) emtombed within a concrete outer tank (8) by first erecting a pair of sidewall forms (51) on a base plate (44) to create an open-top enclosure (54). The inner tank (180) can include a plastic tank (152) enclosed within an external framework (154), the combination (150) housed within a steel tank (174). A layer of concrete (56) is poured onto the base plate, the inner tank is lowered onto the layer of concrete, and concrete is poured into the enclosure to entomb the inner tank while the bottom layer of concrete is stil wet. Reinforced hold-down bars (86) extend over the top of the enclosure and have downwardly extending hold-down tubes (92) which engage the top of the inner tank and keep the inner tank positioned horizontally and vertically. The hold-down bars are fastened to the base plate to keep the inner tank properly positioned.

Abstract: A prestressed composite tank has a vertical wall that extends around a storage area. The wall is made up of a substantially vertical, preferably metallic diaphragm and a layer of shotcrete on one or both sides of the diaphragm. The diaphragm is formed from a series of side-by-side panels, each of which panels has a vertically extending edge portion on each side thereof. The adjacent edge portions of each side-by-side pair of panels are in intimate, mechanical interengagement and subsequently sealed to thereby present fluid impervious joints between the adjacent panels.

Abstract: The present invention is directed to improved tank structures and the processes and apparatus for their construction. The walls of the prestressed tank are formed by inflating a membrane, applying one or more layers of rigidifying material on said membrane and then prestressing the walls by circumferentially wrapping prestressing material to minimize the tension in the rigidifying material when subjected to loading. In another embodiment wall forms are placed inwardly of said membrane to aid in the forming and support of the walls under circumferential prestresing. In the best mode of the invention, the walls are of reinforced plastic, fiber, or shortcrete and resin sandwich composite construction.

Abstract: A composite elevated storage tank is constructed utilizing precast concrete panels for a pedestal which supports a steel storage tank. The precast concrete panels are poured in a controlled environment not subject to the difficulties inherent with sitecast concrete construction. A simple and practical method of attaching the panels to each other as well as to the foundation and steel tank ensures the concrete pedestal behaves as a shell to sustain all loads. This method, which uses cast in plates welded together at vertical joints and vertical aligned threaded rods for horizontal joints, serves to reduce the length of time required to construct a composite elevated tank and also reduces the construction costs.

Abstract: A longitudinal receptor construction for insertion into a channel or opening and for holding a desired element is provided. The receptor has an inverted L-shape cross section in which a horizontal leg is advantageously suited for retrofit usage in an existing groove or channel opening and has locking features which afford substantially improved capability for holding the receptor and the element inserted into the receptor.The groove into which the receptor is positioned may be the groove contiguous to a swimming pool coping and may be the same groove devised for and used to hold another element such as the peripheral bead of a swimming pool liner. Sufficient gripping force by the horizontal receptor leg in the locking groove or channel is provided by the receptor leg configuration which prevents dislodging of the receptor leg by forces pulling on the receptor or other member which may be present in the opening.

Abstract: A flat prefabricated panel formed from a three-dimensional metal screen and from a reference layer of foamed plastic is converted into a curved panel suitable for the formation of a curved wall by cutting said screen along parallel lines on one face of the panel, utilizing said cut line to incurvate the panel to make the opposite face thereof concave and finally restoring the integrity of the screen on said face of the panel by means of reticular connecting strips applied along said cutting lines.

Abstract: The large-sized underground storage tank is consisting of a metal shell (1), a static facing in reinforced or unreinforced concrete (2) and filling material (4) packed in the hollow space between the two above mentioned surfaces; this filling is consisting of blown bitumen having plasticity properties which provide a stress resisting interaction between the tank shell and its static facing, thus greatly improving the stability of the overall tank structure; hence the possibility to reduce the design strength parameters and to cut the cost of the final product.

Abstract: A structure for use as a wall, floor or roof comprising a plurality of panels with a pair of spaced apart elongated edges; each panel having front and back metal layers of substantially the same shape joined to an insulating concrete core of substantially uniform thickness; the panels being arranged edge-to-edge with an elongated metal member between the edges of two adjacent panels; and the edges of the panels being joined to the adjoining elongated metal member.

Abstract: A flat prefabricated panel formed from a three-dimensional metal screen and from a reference layer of foamed plastic is converted into a curved panel suitable for the formation of a curved wall by cutting said screen along parallel lines on one face of the panel, utilizing said cut line to incurvate the panel to make the opposite face thereof concave and finally restoring the integrity of the screen on said face of the panel by means of reticular connecting strips applied along said cutting lines.

Abstract: A large container and a method for accommodating pourable, pasty and sludge-like materials are distinguished by the use of side walls (5) of textile material. Containers are especially suitable for draining and final depositing of mud and for casting concrete structures. Supporting structures (6, 7, 8) with which the textile material (5) can be held before the containers are filled can be removed after the containers are completely filled.

Abstract: A dump receptacle has an outer wall and an inner wall, the inner wall consisting of several, adjacent wall elements which are supported on the outer wall. When repairing the inner lining of the dump receptacle, individual wall elements can be removed through the space between the inner wall and the outer wall. This dump receptacle permits the repair of the lining even if the receptacle is full and is thus especially suitable for the long-term storage of special refuse.

Abstract: An improved dome structure on a base is disclosed comprising of a membrane sandwiched between layers of rigidifying material such as shotcrete which also serve to embed the circumferential and radial prestressing members. Circumferential prestressing can be applied to minimize bursting stresses. Further layers of rigidifying material can then be applied over the circumferential prestressing as a final protection and cover. The radial prestressing materials can contain spacers or hooks to preclude the circumferential prestressing material from riding up on the structure. The lower portion of the dome can include a reverse curvature to minimize stresses and stabilize the structure.

Abstract: A buried vault for telecommunication equipment is disclosed. It is adapted to connect with telecommunication conduits, especially optical fiber conduits enclosing optical fibers. The vault encloses laser light generating devices for providing signals and also encloses suitable signal switch gear for telecommunication circuitry. The wall is constructed of alternating plies of glass fibers matting and woven roving, each layer being applied and joined with a polymeric resin. It is then covered with a light weight layer, the preferred form being balsa wood and the outside surface is then sprayed with a skin, typically a polyester resin co-mingled with chopped reinforcing fibers of random lengths randomly distributed or glass fibers matting and woven roving plies.

Abstract: A hopper for bulk material comprising a non-deformable skeleton supporting a deformable wall structure in such a manner through suspension members that slight movements of the wall can be taken up without scoring.

Abstract: A system for forming structures, such as buildings, including the forming of a foundation slab, attaching flexible wall panels to the periphery of the foundation in a serial overlap configuration, installing prefabricated windows and doors, draping and attaching a membrane over the top of the wall panels, inflating the membrane upwardly to form a surface upon which to spray a foam substance, and spraying the foam to either the interior or exterior surfaces of the structure, including the roof membrane, so that an economical and energy efficient building can be provided at a low cost.

Abstract: A grain silo comprises a wall body having an inner wall surface and a lining coated on the inner wall surface. The lining comprises at least one protective layer which includes hydrophilic urethane resin of one-can type.

Abstract: Insulating panels or plates are formed along their opposite longitudinal edges with a cylindrically segmental projection and a cylindrically segmental groove receiving the projection, both of these formations being preferably formed as extruded polyvinyl chloride shells. The arc length of the groove is greater than 180.degree. but less than that of the projection so that the plates can be interfitted and angularly offset to fit around a vessel, the angular adjustability allowing the plates to be accommodated to greater and lesser curvatures of the vessel.

Abstract: A conventional tower silo is converted to a limited oxygen feed storing silo with the use of an air impervious liner and a floor supporting a bottom unloader. The liner has plastic liner sheets attached to the inside surface of the silo side wall with fasteners, as adhesives and nut and bolt assemblies. An alternate liner comprising a tubular air impervious plastic member is located within the silo. The plastic member is not attached to the silo side wall. Supports mounted on the silo side wall under the roof carry the upper end of the liner. In one form, a plurality of springs connected to the supports and liner yieldably support the upper end of the liner in the silo. In another form, the upper end of the liner is yieldably supported with a plurality of counterweights connected to the liner with cables. An inside wall surrounding base aggregate supports the floor independently of the silo side wall. The floor has a radial trough accommodating the bottom unloader.

Abstract: A storage tank, such as a water tower is disclosed, made by bolting rows of glass-coated steel plates together. The plates overlap each other side to side and above and below. The contact with plates at the diagonal corners is not an overlapping contact but an abutment contact, and the lines of abutment contact are staggered row to row. This arrangement leads to a very efficient use of material, and to an inherently leak proof structure when the plates are arranged to form a double skin in the lower regions of the tower.

Abstract: The invention relates to a protective structure for a concrete enclosure able to contain a fluid, which can be raised to a high temperature.Starting from the floor of the enclosure, the structure comprises a porous layer, intersecting shaped sections and a tight metal skin formed from plates, welded edge-to-edge along the axes of the shaped sections, after being fixed to the latter e.g. by weld spots. The cavities formed between the shaped sections receive concrete blocks and flexible joints. The metal skin has a peripheral rising portion along the walls of the enclosure and extending up to the maximum fluid level in the enclosure.Application to enclosures having to receive hydrocarbons or liquid sodium, e.g. on the site of a fast neutron nuclear reactor.

Abstract: An insulated chimney pipe for use with boilers or open fires has a plurality of sections comprising an outer wall of galvanized steel connected by two end caps to an inner wall formed of a refractory material comprising alumino-silicate fibres bonded together with an inorganic colloidal bonding agent.

Abstract: A storage tank for liquid bitumen including a steel shell having heat insulation adjacent to its interior surface. The insulation is glass foam. Preferably, the insulation is in the form of glass foam panels which are initially arranged with gaps between them. When the tank is filled for the first time, the liquid bitumen penetrates into the gaps and solidifies therein to permanently interconnect the glass foam panels. A glass foam insulating cover floats on the surface of the liquid bitumen, and a heating unit is located within the tank.

Abstract: Panels are secured to a substantially flat or convex surface by means of hooks which are attached to the surface at opposite ends of a panel. The hooks are dimensioned so as to terminate at a level beneath the level of the outer surface of the panel and a band of fabric material is positioned on each of the hooks by means of a loop formed substantially at the mid-point of the band, the band also having a loop at each end thereof. The panel is secured to the flat or convex surface by means of springs which are attached to the free ends of the bands and by means of a strap which extends between the springs.

Abstract: An insulated tank jacketing system for storage tank structures of the type used for oil, water, etc., wherein insulated panel systems having upstanding and opposed side flanges are affixed to wire cables or the like on the outside wall of the tank structure by means of a continuous fastener interposed around each cable and positioned between the side flanges of adjacent panels and held in place by having the side flanges of adjacent panels rolled over each other with the fastener being locked within the closure roll thus allowing all component parts of the system, including the cable, to expand and contract relative to each other with no restriction.

Abstract: The present invention relates to a method of building a reservoir for storing liquefied natural gas at low temperature.This method consists in fixing on the internal wall 22 of the concrete vessel 3 a first thin lining 21 forming a first fluid-tight barrier, then in completely filling the space between the tank 2 and the concrete vessel 3 by means of a heat-insulating structure comprising an assembly of stacked blocks 25 of insulating material, associated with a second thin lining 24 forming a second fluid-tight barrier, said structure being supported by the concrete vessel and simply arranged round the inner tank.The building method according to the invention applies in particular to liquefied natural gas storage reservoirs installed on solid ground.

Abstract: A conventional tower silo is converted to a limited oxygen feed storing silo with the use of an air impervious liner and a floor supporting a bottom unloader. The liner has plastic liner sheets attached to the inside surface of the silo side wall with fasteners, as adhesives and nut and bolt assemblies. Supports mounted on the silo side wall under the roof carry the upper end of the liner. In one form, a plurality of springs connected to the supports and liner yieldably support the upper end of the liner in the silo. An inside wall surrounding base aggregate supports the floor independently of the silo side wall. The floor has a radial trough accommodating the bottom unloader.

Abstract: Multi-wall devices embodying two or more spaced members arranged to provide an enclosed space therebetween for controlling the transmission of energy through the members for the purpose of capturing, storing and releasing energy.

Abstract: A suspended nose construction for high temperature furnaces providing refractory replacement from the cold side of the refractory has a plurality of wedge-shaped refractories arranged to form a wedge row along the length of the nose adjacent, on at least one side, a plurality of rectangular-shaped refractories arranged to form a straight row along the length of the nose. The converging sides of the wedge-shaped refractories converge toward the cold side of the refractory. Both the wedge refractories and the rectangular refractories are suspended in pairs by suspension means from an exterior support structure, the suspension means and support structure providing space allowing removal of the refractories in pairs from the cold side of the nose construction. The suspended nose construction according to this invention provides for removal and replacement of a small number of refractories in the nose without disturbing the major portion of the nose construction.

Abstract: To enable the benefits to be obtained simultaneously of using cast iron as a major constituent and of using helical prestressing, the cylindrical wall structure of a pressure vessel (which may be for a nuclear reactor) is made of truncated wedge shaped cast-iron slabs (the wedge faces of the slabs lying in radial planes of the wall structure and mutually adjacent slabs abutting one another in those planes, with a plurality of such slabs forming an annular assembly and a plurality of such assemblies stacked coaxially to form the cylindrical wall structure), the slabs having cast-in through passages, disposed obiquely, both right and left-handed in alternate layers at progressively increasing radial distance with respect to the cylindrical wall structrue, and the passages of one slab in alignment with the ends of passages of adjacent slabs in the same annular assembly and in the annular assemblies stacked adjacent thereto to provide in the assembled cylindrical wall structure a system of right- and left-handed

Abstract: A storage tank for cryogenic liquefied gases comprising an outer shell, a fluid-tight inner shell defining the storage space containing the liquefied gas and an insulating structure provided in the evacuated intermediate space, the insulating structure including a wall made of juxtaposed hollow, evacuated panels, the joints between adjacent panels being tightly covered by elements adapted to take up the cold-induced wall shrinkage, the elements and the inner wall of said juxtaposed panels forming said inner shell.

Abstract: A transport container for transporting hot particulate materials, particularly coke, has a wall bounding an inner chamber for accommodating a hot particulate material and having an inner side, a coating arranged at the inner side of the wall and composed of a plurality of coating members, and holding elements provided on the inner side of the wall and having a plurality of openings, so that each of the coating members releasably engages in a respective one of the openings and is thereby held by the holding elements, so as to coat the inner side of the wall.

Abstract: A large volume, thermally insulated tank is formed by constructing the tank sidewall in superimposed sections. Each section is constructed without the use of external support forms by laying a first outer course of thermal insulating material and then forming a first inner course of refractory material spaced therefrom. The cavity between these two courses is then filled with cementitious material, and the process is repeated until a tank wall of the desired height is completed. The resultant tank wall will have an outer layer of light, thermal insulating material, an inner layer of refractory material and a core of cementitious material joining the two layers.

Abstract: A protective wall structure having a high resistance to blast and fragments includes two spaced groups of panels of sheet metal in interlocking relationship and defining each of the two opposite faces of the wall structure, a plurality of diagonal panels extending diagonally in saw-tooth configuration between the face panels and in interlocking relationship with them, and a filling material of concrete or asphalt filling the space between the face panels and embedding the diagonal panels therein.

Abstract: The sidewall of a swimming pool is made up of bendable sheet modules fastened together at their ends. One end of each module is bent outwardly to define a vertical flange, the other end being unbent. A step is provided in the flanged end of each module of a depth to receive the unbent end of an adjacent module in coplanar relation to the unstepped area. Headed fasteners secure the modules together, their heads being housed in nested recesses in the overlapping portions of the modules to provide a smooth and continuous inner surface for the wall, the nested recesses serving to transmit forces from one module to the next without placing shear stresses on the headed fasteners.

Abstract: An improved insulating panel for tank-like vessels, such as chemical reactors, precipitators and the like is disclosed. The outer surface of the panel is designed so that heat paths from the insulated structure are minimized. This is accomplished by means of a dual fastening system in which surface panels are connected to one another by means of stitching fasteners while the entire panel structure is fastened to its supporting girt by means of mounting fasteners which are positioned beneath the surface panels and which are thus not directly exposed to the outside air. These mounting fasteners are the elements which provide a heat path from the insulated structure to the surface panels and the outside air. Employment of this improved insulation system reduces heat losses through the panels while maintaining cooler surface temperatures on the panels. Both of these features result in reduced heat loss due to convection and radiation.

Abstract: A swimming pool wall, for placement in an excavation, is made up of a series of bendable plates having only vertical flanges for stiffening while permitting shaping the wall to a selected outline. A resilient coping strip embraces the upper edge of the wall and houses a rigid metal bar to retain the upper edge of the wall in the desired configuration while other braces, at the lower edge of the wall extend from the plates to the outer edge portions of the flanges to securely maintain the lower edge of the wall in the desired configuration. Vertical Z-shaped bars are secured to certain of the plates to further stiffen them and further braces, secured to the flanges, extend diagonally upward into a concrete apron, selected ones of the diagonal braces carrying a form plate for defining the outer edge of the apron. Rigid bars are used to hold corner plates to a desired curvature during assembly of the pool wall and its placement in the excavation. After back-filling and forming the apron, those bars are removed.

Abstract: Underground storage tank for fluids which has an inner and an outer wall of thermosetting reinforced plastics material and a leak monitoring space between these walls, said space comprising a continuous air and liquid permeable synthetic concrete mixture of a thermosetting resin and compression resistant filling material having no small components, the concrete forming the static load bearing layer of the tank, the dosing of the synthetic resin being such that a sufficient wetting of the surfaces of the filling material particles is achieved for the bonding of the filling material particles with one another while securing the continuous leak monitoring space, and the synthetic resin concrete layer being firmly bonded to the thermosetting plastic of the inner wall and the outer so as to form a homogeneous unit.

Abstract: A swimming pool wall 10 is made with a vertical resin wall 15 and an outer resin form 16 spaced from and parallel with each other, and concrete is poured in the space between and formed over the bottom of the pool. Both resin wall 15 and form 16 are formed as continuous strips of resin material. Vertical C-shaped channels 26 are adhered periodically to the outside surface of resin wall 15, and T-head stakes 25 interlocking with channels 26 are driven into the ground to support wall 15. Each stake 25 has a horizontal arm 30 that extends outward, and vertical braces 31 extend upward from the outer ends of arms 30. Form 16 is upheld by arms 30 and vertically supported against braces 31, making form 16 parallel with wall 15 and uniformly spaced outward from wall 15. Latches 35 extend from stakes 25 to braces 31 to support the braces and hold form 16 in place. Bars 32 are driven vertically into the ground between braces 31 and adjacent the inside surface of form 16 to prevent bulges.

Abstract: A reinforced concrete tank to surround a steel tank for storage of liquified natural gas which includes a base plate and an upstanding cylindrical wall with the base plate having a plurality of polygonal swing plates hinged to it to move about the hinge in a radial direction but not in a tangential direction and suporting the cylindrical wall above the base plate on projections from the wall that bear on the tops of the swing plates. The tank thus supported permits radial motion of the base plate due to thermal expansion or contraction but resists tangential forces such as those caused by earthquakes or explosions.

Abstract: A dual wall concrete smokestack having a freestanding flue liner in each flue. The smokestack being constructed of preassembled and precast concrete sections axially stacked one upon the other. The preassembled sections have a precast concrete body having a flue aperture. An inner flue liner is carried within the flue aperture spaced inwardly and concentrically from the wall of the flue aperture. The wall of the flue aperture further having a flue liner stop means. The inner flue liner having a bracket for engaging the flue liner stop means to prevent the flue liner from dropping downwardly and out of the concrete body when being transported to the site of construction. The concrete body further having another aperture to be aligned with a corresponding aperture of an adjacent section for receiving reinforcing rods extending from the bottom of the smokestack to the top of the smokestack and for receiving poured concrete as the smokestack is being erected to tie the sections together.

Abstract: In a double-walled tank for low-temperature liquids, such as a liquid gas, an inner tank forms a primary safety casing while an outer tank, enclosing the inner tank, forms a secondary safety casing. The inner tank includes a base and an upwardly extending side wall with at least the base being formed of metal. Preferably, the outer tank is formed of reinforced concrete. A thermal insulation layer is located between the two tanks, a ring of reinforced concrete encircles the junction of the side wall and base of the inner tank. The ring is L-shaped and in radial section has an upwardly extending leg in contact with the outside surface of the side wall and a generally horizontal leg in contact with the radially outer part of the lower surface of the base.

Abstract: A generally cylindrical tank is insulated by affixing thermal insulation panels on the side walls thereof using generally helically disposed tension elements such as wire to maintain the panels in position at least during installation.

Abstract: Cryogenic insulation seal for a concrete container, having an inner cryogenic liquid tank, comprising a concrete floor slab, a vertical concrete wall moveably supported on the concrete floor, and insulation positioned within the container adjacent the horizontal floor slab and the vertical concrete wall, and including a metal, e.g. steel, liner positioned around the inner surface of the container, adjacent the inner surfaces of the floor slab and the concrete wall and supporting the insulation, and forming an inner seal around the container. The steel liner is inclined from the vertical at a corner above the floor slab and is attached to the vertical concrete wall at a predetermined height above the floor slab, forming a gap between the liner and the concrete vertical wall at the corner, and permitting inward lateral motion of said vertical wall with respect to the floor slab at such corner, while permitting the steel liner and the insulation supported by the liner to flex and maintain a seal at the corner.