Abstract: Apparatus, method and product of in situ attachment of insulation panels to poured concrete walls as the walls are formed. Polymeric F-shaped strips are attached to novel tie bars by spring clip retainers, and receive the edges of insulation panels to hold them against the forms so that uncured concrete is poured between the forms and against the panels. After the concrete is cured, the forms are removed, leaving the spring clips and tie bars in the concrete, and resulting in a concrete wall having insulation panels and secured strips, the strips also serving to receive dry wall fasteners.

Abstract: A method for lining a manhole: (i) inserting into the manhole a tubular liner wet with a curable liquid resin; (ii) everting an inflatable plastic bag into the tubular liner by charging water in it; (iii) closing the open end of the everted bag to form a closed space inside the bag; (iv) supplying compressed air to the closed space to cause the plastic bag to inflate and press the liner against the manhole; and (v) curing the liquid resin to harden the liner; and further improvements include: plugging the main pipe with two plugs to isolate the manhole and stop the drain from wetting the manhole, but providing a hose penetrating through the plugs to allow the drain to flow past the manhole; partially filling the portion of the main pipe isolated between the two plugs with a liquid absorbent filler; the tubular liner has varied thickness increasing toward its lower end stepwise or continuously and has its lower opening covered up by a net attached to the lower end circumference of the liner.

Abstract: Methods of lining the internal surface of a pipe include first inserting two lining pigs into the pipe and then introducing a batch of resin thereinto, or inserting one lining pig between two batches of a resin, or first inserting a lining pig and then inserting two batches of a resin with another lining pig therebetween, or first introducing a lining pig made of a soft material capable of deforming so as to pass through a narrow-passing section and then introducing a batch of a resin into the pipe, causing the resin to move forward until the front end of the resin reaches an inner end of the pipe, and sucking the resin back from the inner end so as to line the internal surface of the pipe with the resin. The methods use improved liquid blocking pigs for use in pipe lining treatment, each of such pigs includes a spherical body made of a soft resilient material and at least one flexible liquid barrier diaphragm interposed in the spherical body.

Abstract: A material having fibers in a curable matrix is applied as a reinforcement to a vertical column. The matrix is cured by providing a reinforcement curing apparatus including a steel cylindrical housing split lengthwise into at least two sections, and a plurality of elongated radiant heaters mounted to an interior wall of the housing and oriented to direct their heat inwardly. The curing apparatus is assembled around the perimeter of the column having the reinforcement thereon and operated to heat and cure the reinforcement.

Abstract: A formwork constructed of prefabricated elements, preferably for building a concrete wall. The formwork has two parallel walls that define a space that is filled with concrete laden with water, sand and large aggregates. An inner wall of the formwork has a lattice or perforated structure to filter and pass water and small aggregates from the space that is filled with concrete. An outer wall also has a lattice or perforated structure to filter additional water and smaller aggregates from the space that is filled with concrete. This invention also includes a concrete heating wall that may be constructed from formwork.

Abstract: There is disclosed a propellent having a deterred burn rate. The propellent is a particulate containing an energetic binder base and a thermoplastic burn deterrent. The energetic binder has in impetus (energy) in excess of 200,000 foot pounds per pound (mass) and the thermoplastic burn deterrent is both a solid at room temperature and soluble in an organic solvent. The burn deterrent is gradationally dispersed within the particulate with the greatest concentration of burn deterrent at the particulate periphery.

Abstract: A method of installing an impervious barrier onto a roof is described. A reinforcement textile is initially applied to a roof substrate. Thereafter, an elastomer composition is sprayed onto the reinforcement textile. The deposited elastomer composition lifts the reinforcement textile from the roof substrate and embeds it into the elastomer composition, leaving no visible sign of the reinforcement textile. The processing steps are the opposite of those of the prior art. The processing is possible in view of the characteristics of the disclosed reinforcement textile, the elastomer composition, and the conditions under which the elastomer composition is applied to the reinforcement textile.

Abstract: A tile having a desired pattern is provided. The pattern goes through the tile in the thickness direction. For manufacturing such a tile, e.g. a partition plate 84 is disposed in a pressure forming die 91 so as to divide its inside space into an outer forming space 95 and an inner forming space 96. Light black granules and light red granules are filled respectively in the outer and inner forming spaces 95, 96. Then, the partition wall 84 is taken out from the die 91, and lining granules are filled over the colored granules. Thereafter, they are pressed into one body and burned.

Abstract: Modular Structures preferably usable to form human habitations in outer space are fabricated by molding. A mold comprising progressively surrounding flexible walls defines progressively surrounding cavities. A selected cavity or cavities are inflated or pressurized, as with gas, to distend to assume a predetermined configuration. Another selected cavity or cavities are injected with mold material, which is then allowed to harden. A pressurized cavity or cavities may be evacuated and then filled with mold material. In this manner, a strong structure is progressively formed is subsequent injection and hardening steps. In alternative embodiments of the molding method, supports or reinforcing members are placed within cavities prior to inflation and material injection. These supports space apart adjacent flexible mold walls and force the flexible walls to assume a desired configuration under inflated conditions.

Abstract: An elongated molding for covering the corner at the junction of a wall and a ceiling has a pair of longitudinally extending margins each of which is provided with a recess. Both recesses are bordered by a pair of longitudinal surface portions, and the surface portions flanking one recess are to abut or be bonded to the wall while the surface portions flanking the other recess are to abut or be bonded to the ceiling. The molding has a front side which is to face away from the wall and the ceiling, and the surface portion of each pair nearest the front side adjoins a bevel which is located between the respective surface portion and the front side. The molding is bonded to the wall and the ceiling by joint compound or spackling compound placed in the recesses. The bevels define gaps with the wall and the ceiling, respectively, and such gaps are filled with joint compound or spackling compound to enhance bonding.

Abstract: A connection method for connecting precast concrete beams involves supporting both ends of the precast concrete beams, lifting up the central points of the precast concrete beams, placing concrete in the gaps between the ends of the precast concrete beams, and positioning tendons through anchor blocks which project from the precast concrete beams. The tendons are then tensioned and, substantially simultaneously, the lifting forces applied to the concrete beams are reduced. The connection method reduces the bending moment caused by the self-weight of precast concrete beams and, as a result, reduces the size of the beam section.

Abstract: An increased efficiency method and apparatus for lining a section of pipe with a cement mortar. After a wet cement mortar has been applied to a cleaned interior surface of a pipe, carbon dioxide is introduced into the freshly lined section of the pipe in such quantity that a crust of calcium carbonate will be formed on the interior surface of the wet cement mortar lining as the carbon dioxide reacts with calcium compounds of the wet cement mortar in a relatively short period of time. This crust is provided to protect the underlying mortar from scouring, while tolerating a low-velocity flow of water, until the normal hardening of the underlying mortar through hydration can take place so as to substantially reduce the out-of-service time of the section of pipe which is being lined.

Abstract: A tube made of plastic with a body in the wall of the tube which body can be pierced by a hypodermic needle. The body has sealing elements extending therefrom. The tube is molded around the body and sealing elements. A tool is provide which includes an upper and lower portions with the body being initially molded in the upper portion and then the portions are rotated 180 degrees and the tube is then molded around the body.

Abstract: A retaining member for retaining spaced rigid members within a concrete matrix. A form for shaping the concrete matrix includes a base, a planar shaping surface for supporting the concrete matrix during its initial setting period, and a supporting member located on the rear side of the shaping surface. The retaining member includes a compressible hollow cylinder, preferably made of a foamed polymeric material. Portions of the retaining member are associated with the form and the supporting member, holding the retaining member in place to retain each rigid member in a parallel position to the other rigid members.

Abstract: A method for placing a thixotropic low-cement castable refractory material without the necessity for forms. A low-cement castable material is mixed with a measured amount of water, then is pumped hydraulically through a hose to a nozzle assembly. Compressed air and a cement setting agent are added to the mixture at the nozzle. The addition of the setting agent at the nozzle overcomes the thixotropic nature of the low-cement castable, so that it will immediately "set" in position when sprayed onto a surface, including vertical and overhead surfaces.

Abstract: The present invention is directed to a method for preparing or repairing a machine foundation by using a hollow form which surrounds vertically extending reinforcement rods and is filled with a fortifying material to secure the hollow form to a slab. The form is preferably made of an aggregate filled thermosetting resin or a thermoplastic resin which are corrosion and chemical resistant materials free from fluid attack such as the liquids in the machine, for example, in a pump the fluids being either the lubricating fluids or the fluids being pumped. More particularly, the present invention is directed to a hollow form which may be used either to prepare a machine foundation or to repair a degraded slab or foundation and preferably is a single form.

Abstract: A series of metal connectors each have parallel anchor rods welded to the shorter flange of a right angle section, a cavity defining member attached to the wider flange, and right angle mounting brackets welded to opposite ends of the angle section. The connectors are attached to the base form for tilt-up concrete wall panels and become embedded in the wall panels. After each cured wall panel is erected and seated on a concrete foundation, a hole is drilled on an incline into the foundation through the cavity and a hole within the wider flange of each angle section. A threaded anchor rod is inserted into the hole and secured to the foundation by adhesive, and a nut is threaded onto each rod within the tubular member for securing each wall panel to the foundation.

Abstract: There is provided a method for lining the internal surface of a pipe having a first open end and a second open end.

Abstract: A method of making a combination concrete panel wall, concrete window frame, and concrete sash glazing frame. The sill, lintel, and jambs of the window frame are fiber-reinforced concrete extrusions. The hardened frame is placed in a concrete panel molding frame to locate and define a window opening. The concrete panel wall grout is then poured and dovetail-type mortise and tenon joints are precast in the exterior faces of the window frame which abut the poured concrete wall panel plastic grout, to permanently mold and interlock the window frame to the panel wall. The sash members are fitted about a window pane which is located in interior grooves in the sash members and then glazed. Sealing means interconnects the sash to the window frame to provide a condensation-resistant, water-tight, air-tight, heat and fire-resistant concrete wall closure.

Abstract: A method of making a combination concrete panel wall, concrete window frame, and concrete sash glazing frame. The sill, lintel, and jambs of the window frame are fiber-reinforced concrete extrusions which are cut to length and cemented together. The hardened frame is placed in a concrete panel molding frame to locate and define a window opening. The concrete panel wall grout is then poured and dovetail-type mortise and tenon joints are precast in the exterior faces of the window frame which abut the poured concrete wall panel plastic grout, to permanently mold and interlock the window frame to the panel wall. The sash members are fitted about a window pane which is located in interior grooves in the sash members and then glazed. Sealing means interconnect the sash to the window frame to provide a condensation-resistant, water-tight, air-tight, heat and fire-resistant concrete wall closure.

Abstract: A method for the production of substantially vertical walls, and specifically, walls made of concrete, includes a single sided concrete form used, for example, to form a concrete wall against a preexisting wall or embankment, by pumping concrete into a gap between the form and the preexisting wall or embankment, and raising the form vertically as the pumped concrete settles and drys. The method enables the construction of vertical walls of superior strength in less time as compared to currently available systems.

Abstract: A method for installing a mold apparatus in a manhole assembly and filling the mold apparatus with a sealing material to establish a solid bond that blocks inflow of fluids at the joint between abutting components of the manhole assembly includes providing an open ring, a retaining band for urging the open ring into contact with the manhole so that the open ring defines an annular channel at the joint, and a sealing material dispenser for conveying sealing material into the annular channel. The sealing material hardens in the annular channel to provide the solid bond at the joint between the two manhole components. The manhole components may be an abutting manhole frame and manhole, or two abutting sections of manhole.

Abstract: A process for producing an inner refractory lining of a ladle or metallurgical vessel for casting steel. The inner refractory lining incorporates wall passages with conical nozzle bricks and/or bubble bricks. The inner lining is produced by using a thixotropic vibrational lining mass. Templates are employed to maintain openings for the wall passages during production of the inner lining. After the inner lining is produced, the templates are removed from the inner lining. Once the templates are removed from the inner lining, the conical nozzle bricks and/or the bubble bricks are inserted into the openings. Each of the bricks is mortared into an opening without using seating blocks. The bricks are mortared into the openings so that the bricks remain free from contact with the inner lining.

Abstract: A method of manufacturing an open top, walled member for containing a molten metal, including the steps of forming an inner wall of a mold with a metal sheet and an inner lining covering the sheet, wherein the inner wall defines an inside surface of the walled member and transferring a casting compound between an outer wall of the mold and the inner lining of the inner wall to form the walled member. The metal sheet and inner lining are then removed to allow one to apply heat to dry the casting compound. In the case where the metal sheet includes a plurality of openings, one may also retain the inner wall during the heating step. The heat to dry the casting compound is applied to the inner lining to a sufficient temperature to melt the inner lining and uncover said openings of the metal sheet. The metal sheet is removed when the casting compound is dried.

Abstract: A method of manufacturing an open top, walled member for containing a molten metal, especially a flowing molten metal or reconstructing a worn or damaged member. The method includes the step of forming the inner walls of a mold which define the inner surfaces of the walled member of an open metal mesh screen which is meltable by the molten metal which is to be contained. The next step is to transfer, usually by pumping, an alumina-silicon carbide casting compound into the space between the open mesh metal screen and the outer walls defining the mold, which outer walls may be in situ structures. If an existing walled member is being repaired, any damaged or worn portions of the existing walled member are removed and the casting compound is poured in to replace these portions. The next step is to apply heat to dry the casting compound while the open mesh screen of the mold remains in place in contact with the casting compound.

Abstract: A reticulated net for use in reinforced concrete construction includes a first plurality of evenly spaced coplanar rods forming an upper rim and a second plurality of evenly spaced coplanar rods forming a lower rim. The rods of the upper and lower rims are laterally offset and connected by triangular waveform connecting rods. Each connected adjacent pair of upper and lower rods, in conjunction with the associated connecting rod, forms an individual truss member. Pursuant to the disclosed method for reinforced concrete construction, to pour a concrete slab, inexpensive permanent concrete forms are disposed within the upper and lower rims of the net. After completion, lower portions of the net remain exposed to facilitate securement of conventional construction elements such as electrical boxes, suspending ceilings, insulation, lighting fixtures, sprinkling systems, partition wall systems, etc.

Abstract: A foundation vent (20) for use with concrete forms (31 ) includes two frames that telescope together into a plurality of locking positions to allow the width of the vent to be changed to match the thickness of the concrete wall. The first frame (26) includes first walls (34) and a first flange (40). The first frame has a first inner end (36), and a first outer end (38). The first flange is disposed around a perimeter of the first outer end. The second frame (28) includes second walls (60) and a second flange (70). The second frame has a second inner end (66), and a second outer end (68). The second flange is disposed around a perimeter of the second outer end. A ridge (74) engages in channels (52, 58) defined by a plurality of shoulders (50, 54) disposed on the frames to allow the two frames to telescope together and to lock at various, predetermined widths. The ridge is disposed around a perimeter of the second inner end of the second frame. The ridge thus engages one of the channels.

Abstract: Apparatus and method for constructing a manhole collar between an existing manhole cone and a precast manhole ring. The apparatus includes a circular slip form tube, tapered from a larger top diameter to a smaller bottom diameter; at least two support arms, radially extending from adjacent the top of the slip form tube for placement on a support surface, such as a road surface, to hold the tube at a selected height relative to ground level within a manhole cone; and a plurality of fasteners for attachment of a precast manhole ring about the exterior periphery of the slip form tube for supporting the ring at a selected height relative to the manhole cone and the roadway surface. The apparatus may include a concrete spill retention ring, placeable upon the top rim of the manhole cone and around the slip form tube to prevent concrete from entering the manhole cone.

Abstract: A pair of concrete coated pipe joints welded together end to end with a gap between the concrete coatings, the gap being filled with a fast setting elastomeric polymeric infill material, either solid or foamed, and a particulate filler material, and a method for molding the infill material with the mold being filled with filler material before the polymer components are injected, and with a membrane lining the mold to prevent the polymer from adhering to the mold.

Abstract: A rectangular reinforcing cage is provided for a cast concrete structure having longitudinal registration tubes at each corner of the cage. An outer reinforcing cage surrounds the registration tubes and a coaxial inner reinforcing cage is supported from the outer cage by a plurality of spacers. Each reinforcing cage has a pair of facing C-shaped mats having straight mats overlapping and connected to the bent ends of the "C" to complete each reinforcing cage. Each end of the C-shaped mats have a smoothly curved transition bend joining a portion perpendicular to the main portion of the mat. Each mat has a layer of longitudinal wires connected to a layer of transverse wires. The longitudinal wires being more closely spaced near the end of each mat than in the remainder of the mat with no longitudinal wires in the transition bend of each C-shaped mat. The longitudinal wires are positioned inside each C-shaped mat and outside each straight mat when a reinforcing cage is assembled.

Abstract: A mold for forming an open top, walled member having side walls and a bottom surface for containing a molten metal. The mold including an inner screen having a plurality of openings having inner side walls and a bottom surface. The mold further includes an outer wall, wherein the inner screen and the outer wall are spaced relative to each other to define a space so that the side walls and the bottom surface of the open top, walled member are formed therebetween.

Abstract: An internal metal stitching method for repairing cracks in concrete comprising the steps of cutting slots to facilitate large metal brackets installed every two feet and at alternating angles to the crack. Saw cuts are made in the concrete and near the ends of each large bracket to accommodate end brackets which when fitted resemble a double "t". The saw cuts are cleaned and dryed, filled with a filler resin, and the metal brackets are reinserted and are submerged 1/4 below the concrete surface. The filler is smoothed out to a level flush with the concrete surface. Additional decorative surfaces may then be applied, such as ceramic tiles, carpeting, linoleum or paint.

Abstract: A construction method for one-step grout fixed window frames on external walls of a concrete-structured building includes the following steps. A window frame including vertical and horizontal sections is fixed with vertical lining boards to the inner side of its vertical sections to form a window frame assembly, and is then supported on an upper supporting board which has been securely attached to a concrete template of an external wall of the building. Template sealing strips are separately attached to an exterior edge and an interior edge of the vertical sections and the upper horizontal section of the window frame assembly, so that a complete moulding cavity is formed. Into this moulding cavity the grouting concrete is grouted and the window frame is inlaid in the concrete after the concrete is set and the concrete templates are removed.

Abstract: Described herein is a method for reinforcing a cement block structure having a plurality of vertical cavities therein comprising:providing an access to at least one vertical cavity in the cement block structure large enough to insert a fiber reinforcing element;inserting a fiber reinforcing element through the access such that the element fills the cavity;introducing a slurry of cementitious material into the cavity through the access so that the slurry of cementitious material fills the cavity and infiltrates and encapsulates the fiber reinforcing element; andcuring the cementitious material.

Abstract: An amount of resin necessary for lining an inner surface of a pipe is calculated. A lining pig is inserted in the pipe from an open end thereof, and the calculated amount of resin is supplied in the pipe from the open end subsequent to the insertion of the lining pig. A blocking pig is inserted in the pipe behind the resin, and a pressurized non-compressible liquid is supplied in the pipe subsequent to the insertion of the blocking pig thereby feeding the charged resin through the blocking pig until a front end of the resin reaches an inner end of the pipe. The resin is sucked together with the lining pig and the blocking pig so that the inner surface of the pipe is lined with the resin.

Abstract: A foundation vent (20) for use with concrete forms (31) is disclosed. The vent includes two frames that telescope together into a plurality of locking positions to allow the width of the vent to be changed to match the thickness of the concrete wall. The first frame (26) includes first walls (34) and a first flange (40). The first frame has a first inner end (36), and a first outer end (38). The first flange is disposed around a perimeter of the first outer end. The second frame (28) includes second walls (60) and a second flange (70). The second frame has a second inner end (66), and a second outer end (68). The second flange is disposed around a perimeter of the second outer end. A ridge (74) engages in channels (52, 58) defined by a plurality of shoulders (50, 54) disposed on the frames to allow the two frames to telescope together and to lock at various, predetermined widths. The ridge is disposed around a perimeter of the second inner end of the second frame. The ridge thus engages one of the channels.

Abstract: A method of fabricating a concrete floor having an autogenous hard high gloss finish that does not require further coatings includes pouring a designed concrete mix to establish a slab having an upper surface slightly below the level determined for the finished floor. A finishing floor surface layer is created by applying an amount of a dry shake dressing material containing quartz crystals and a coloring agent, but no coarse aggregate, to the upper surface of the slab and floating the surface until the finishing layer reaches predetermined amount which cures to form a generally monolithic structure with the slab but having a higher compressive strength when fully cured. Necessary expansion joints are provided. The floor is coated with a curing sealer and allowed to cure for approximately 30 days, or until it reaches a predetermined compressive strength. The sealer material is removed and the expansion joints are sealed.

Abstract: An apparatus is provided for installation in a manhole assembly. The mold apparatus is filled with a sealing material to establish a solid bond that blocks inflow of fluids at the joint between abutting components of the manhole assembly. The apparatus includes an open ring, a retaining band for urging the open ring into contact with the manhole so that the open ring defines an annular channel at the joint, and a sealing material dispenser for conveying sealing material into the annular channel. The sealing material hardens in the annular channel to provide the solid bond at the joint between the two manhole components. The manhole components may be an abutting manhole frame and manhole, or two abutting sections of manhole.

Abstract: A projecting construction apparatus for a molten-metal-discharging hole includes a rotating shaft and an impeller rotatably supported by the end of the rotating shaft. The impeller has vanes radially disposed and is open to fluid flow in a generally axial direction, such that gas flowing axially toward the impeller can pass substantially axially through the impeller without being deflected against a wall of the hole, while liquid and solid material are deflected by the vanes against the wall of the hole. At least two material-supplying pipes are located around the rotating shaft, and are connected to supply projection material entrained in a fluid to the impeller, and have ejection ports generally equi-angularly disposed about the shaft axis. The ejection ports are directed toward the vanes, and a plurality of control valves are connected to respective ones of the pipes so as to control an amount of the projection material which is supplied to each of the pipes.

Abstract: A pumpable mine assembly is provided having a pair of steel support structures forming the front and back surface of the seal. The support structures can be formed by either a row of vertically-disposed steel beams or a cable lattice secured by anchor bolts to the top and bottom surface of the mine entry. A separate wire mesh backing is provided on the inside of each of the pair of support structures. A seal bag placed within the wire mesh backing receives filling material, generally in the form of concrete. The filled seal bag forms a tight seal on the top, bottom and ribs of a mine entry or passageway.

Abstract: Tooling for facing a wall includes a plurality of cavities which are formed by four blades, each of the cavities corresponding to various brick sizes. Six lines of interconnected cavities are attached to a cross beam. Adjacent cavities and lines are spaced from another by a predetermined dimension. Unset settable building material is mixed with appropriate coloring and waterproofing agent and is applied to a wall to form an outer layer. The surface thereof is sponged to produce a brick like surface relief. The tooling is pressed into the outer layer to impress a pattern resembling brickwork. Unset material is sucked from the joint line space between adjacent cavities and the layer is allowed to set. Then, mortar is added to the joint line. Once the mortar has set, the final outer layer has a true brick finish that resembles a real brick wall. The unset settable material can be applied to damaged or wood walls so that a true brick finish can be given to a wall in a quick, simple and cost effective manner.

Abstract: A simplified, low-cost forming system (46) and method for the rapid construction of integrated, monolithic cast structures such as storm shelters (20). The preferred forming system (46) includes an inner core form member (48) presenting a base (54) and upstanding sidewall structure (56), together with an open-top outer form member (50) having a circumscribing sidewall assembly (118) and a superstructure (120) releasably secured thereto. In use, the outer form member (50) is telescoped over the inner core form member (48), with the distance between the form walls defining the thickness of the resulting shelter (20); preferably, a reinforcing grid (52) and door frame (32) are located between the form members (48, 50). After form assembly, concrete (178) is poured through the open top of the outer form member (50) to fill the complete form.

Abstract: A lightweight concrete forming tube is disclosed, and wherein the tube has a very thin wall of wound paper layers which permit the tube to be collapsed and wound into a reel to facilitate shipment and storage. In use, the desired length is severed from the reel, and the severed length is opened and positioned about a vertically disposed steel reinforcing structure. Concrete is then poured into the opened tube, and the hydrostatic pressure of the liquid concrete causes the tube to assume a circular cross-section and straight vertical configuration. Upon hardening of the concrete, the tube is severed with a knife and removed, leaving a formed concrete column of circular and straight configuration.

Abstract: A manufacturing process enables the connection of two separately finished skins (12A & 12B) with spacers (14 & 16). The panels are manufactured by casting a first skin (12A), and then attaching the spacers (14 or 16) to the internal side of the first skin, and then casting a second skin (12B) and attaching the spacers to the internal side of the second skin. The lightweight panel (10) also contains internal formwork (15) for structural columns (33) and beam (34) which are cast in situ after the panel has been placed.

Abstract: A method of applying porous building plates includes applying plate-like porous building plates having pores on the surfaces and then jointing them by means of a coated joint method. In the method, the pores on the surfaces of the porous building plates are packed with an acid soluble substance and then the plates are joined by means of a coated joint method. Subsequently, the surfaces of the porous building plates are washed with an acid.

Abstract: A method of producing a patterned shaped article includes the steps of disposing at a prescribed position within a main form for molding the shaped article a cell form having a plurality of cells arranged in a contiguous manner, charging a prescribed amount of dry pattern-course material for forming the pattern course of the shaped article into prescribed cells of the cell form, charging a base-course material for forming the base course of the shaped article into the remaining space of the main form not filled with the pattern-course material, removing the cell form, causing the charged pattern-course material and base-course material to set into a shaped article, removing the shaped article from the main form and, optionally, sintering the shaped article.

Abstract: To facilitate the casting of stronger and more precise steel reinforced concrete members and also to facilitate the formation and field joining of such members there is provided a bar splice which includes a generally cylindrical sleeve open at one end to form an axially elongated chamber to receive a steel reinforcing bar telescoped therein, and provided with internal threads at the other end whereby a threaded bar end may be secured to the other end, and when secured sealing the other end of the chamber. The threads are preferably tapered and the chamber includes inwardly extending axially spaced annular ribs. Lateral ports are provided at each end of the chamber. The wall thickness of the chamber adjacent the threaded end of the sleeve may be increased to improve tensile capabilities. The length of the chamber is most of the splice sleeve since the threaded connection occupies little axial space.

Abstract: A method of in situ protection against corrosion of steel reinforcing bars in freshly poured concrete by application of a potential (anodic or cathodic), thereby enhancing the corrosion resistance of the steel for the life of the reinforced concrete structure.

Abstract: A method for introducing a prestress into a concrete member includes the steps of passing a steel rod (2) through a hollow steel rod (1), applying a tensile force to the hollow steel rod (1), while using the steel rod (2) as a reaction support member, placing concrete (4) around the hollow prestressed steel rod (1), and hardening the concrete (4). The apparatus includes a flat bearing support plate that abuts the concrete to be prestressed, a jack and ram, a rigid support member for interconnecting the jack and ram to the bearing support plate, and a holding cylinder positioned between the bearing support plate and the jack and ram. The bearing support plate and a leading end of the holding cylinder are apertured and screw threadedly receive the threaded trailing end of a hollow steel rod. The trailing end of the steel rod is screw threadedly received by the trailing end of the holding cylinder.

Abstract: An aggregate floor including terrazzo and the like and a method for forming the floor on a supporting surface, the floor including a layer of flexible compound applied to the surface, a reinforcement mesh positioned between divider strips and adjacent the compound and supporting a layer of compacted aggregate forming a substantially level surface. The divider strips are selectively positioned in desired configurations on the flexible compound layer to divide the mesh and aggregate into discreet and crack controlled sections. A mixture of composite cement, water and, in some cases, sand is applied to the surface of the aggregate layer in such a viscosity as to gravitate completely through the aggregate layer and make contact with the underlying layer of flexible compound. Such permeation fills and replaces the air pockets between the aggregate particles and deposits sufficient top coating on the surface of the aggregate to be polished to a finished surface.