US20090249714A1 - Precast concrete modular stairwell tower - Google Patents
Precast concrete modular stairwell tower Download PDFInfo
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- US20090249714A1 US20090249714A1 US12/080,509 US8050908A US2009249714A1 US 20090249714 A1 US20090249714 A1 US 20090249714A1 US 8050908 A US8050908 A US 8050908A US 2009249714 A1 US2009249714 A1 US 2009249714A1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/104—Treads
- E04F11/116—Treads of stone, concrete or like material or with an upper layer of stone or stone like material, e.g. ceramics, concrete; of glass or with an upper layer of glass
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/34—Extraordinary structures, e.g. with suspended or cantilever parts supported by masts or tower-like structures enclosing elevators or stairs; Features relating to the elastic stability
Definitions
- the steel stairway has step pans and a landing pan
- concrete is manually poured into the steel pans forming the steps of the stairway and also into the steel pan forming the landing for the stairway halfway between adjacent floors.
- vertical metal studding is usually installed onto the steel frame members defining the stairwell space for the building and around the stairways and landings to define the stairwell shaft.
- the stairwell shaft is then lined with drywall or other fire resistant sheets, and handrails are installed for the steps for each floor so that the stairwell is essentially completed except for final finishing.
- U.S. Pat. No. 3,755,974, No. 3,830,026, No. 3,980,155, No. 4,248,020 and No. 5,377,778 disclose various preformed staircase or stairway modules, which may be formed of precast concrete, and with each module extending a full story of the multi-story house or building. After the modules are stacked, they form a stairway or stairwell system.
- the present invention is directed to the construction of a modular stairwell tower which is preferably constructed prior to erecting the steel frame members for a multi-story building having a number of floors.
- the tower includes a series of precast concrete stairwell units arranged in a stack with the number of stairwell units corresponding to twice the number of floors in the building.
- Each of the stairwell units includes a precast concrete tower section having vertical opposite side walls and vertical opposite end walls defining an open bottom and an open top.
- the walls of each tower section have a vertical height generally equal to one half the vertical distance between two successive floors of the building, and each stairwell unit includes a preformed or precast inclined stairway connected to one of the side walls of the corresponding tower section.
- a preformed or precast horizontal platform is located adjacent an upper end of the inclined stairway in each tower section and is connected to the side walls and one of the end walls to form a stairway landing.
- Each of the stairwell units is horizontally oriented one hundred eighty degrees relative to each adjacent stairwell unit in the stack, and one of the walls of each alternate stairwell unit in the stack defines a doorway opening.
- Anchor members project into and are embedded in upper and lower portions of the walls of each of the stairwell units, and the anchor members in the lower portions of the bottom stairwell unit are rigidly connected, such as by welded plates, to anchor members embedded in a concrete support floor or base for the stairwell tower.
- Anchor members in the upper portions of the walls are rigidly connected, such as by welded plates, to the anchor members in the lower portions of the walls of the adjacent stairwell unit thereabove.
- the modular stairwell tower of the invention provides for efficiently precasting the stairwell units away from the building site and for conveniently erecting or stacking the stairwell units with a crane.
- Structural steel frame members for the building may be subsequently attached to the erected stairwell tower, thereby providing stability and rigidity for the steel frame members as they are being erected. This attachment eliminates the need for a significant number of steel frame members used for bracing the steel frame as it is being erected.
- the modular stairwell tower of the invention also provides for convenient and safe access to all floors of the building as it is being constructed, thereby providing protection to the steel frame erection crew.
- the modular precast concrete stairwell tower further provides for fire rating without the need for dry wall or masonry and may be prime finished at the precasting facility or factory.
- fire line stand pipes may be installed within the stairwell tower to provide for fire protection during construction of the building.
- the construction of the stairwell tower prior to erecting the steel frame members for the building also enables workers to move tools and materials from floor to floor quickly and conveniently, thereby providing a savings in labor for constructing the building.
- the construction of the modular stairwell tower before erecting the frame members further eliminates the need for ladders and scaffolding and temporary railings during erection of the steel frame, further enhancing the safety aspect of the overall construction process.
- FIG. 1 is a perspective view of the multi-story commercial building having three modular stairwell towers constructed in accordance with the invention and showing in phantom the outline for the steel frame for the building;
- FIG. 2 is a perspective view of two precast concrete stairwell modules or units and illustrating the stacking of a second unit onto a first floor unit;
- FIG. 3 is a fragmentary vertical section through one of the stairwell towers, taken generally on the line 3 - 3 of FIG. 1 ;
- FIG. 4 is a horizontal section of a stairwell tower, taken generally on the line 4 - 4 of FIG. 3 ;
- FIG. 5 is a perspective view of a typical precast concrete stairwell module or unit used in each of the stairwell towers shown in FIG. 1 , and being transported by an overhead crane with attached temporary bracing;
- FIG. 6 is a fragmentary perspective view of a precast concrete stairwell unit and illustrating the forms and reinforcement used for forming a precast concrete stairway and horizontal landing;
- FIG. 7 is a fragmentary vertical section through a precast concrete stairwell unit and illustrating the location of steel reinforcing bars within the concrete;
- FIG. 8 is a perspective exploded view of anchor members embedded within corresponding walls of two adjacent stairwell units and with the connection member;
- FIG. 9 is a fragmentary vertical section through the embedded wall anchors shown in FIG. 8 after being connected by the connection member;
- FIG. 10 is a perspective exploded view of the anchor members and connector member for securing a wall of the bottom stairwell unit to the concrete floor support pad for the stairwell tower;
- FIG. 11 is a fragmentary section similar to FIG. 9 and showing the connection of the anchor members shown in FIG. 10 ;
- FIG. 12 is a fragmentary vertical section through a wall of a stairwell unit and showing an embedded anchor member used for attaching a horizontal steel frame member or beam to the stairwell tower after it is constructed.
- FIG. 1 illustrates a multi-story rectangular building 20 which will receive an erected metal frame system including vertical steel columns connected by horizontal steel frame members or beams.
- the beams support corrugated steel floor panels onto which concrete is poured or pumped to form multiple concrete floors within the building.
- the building 20 will have four floors, but it is to be understood that the building may have more or less floors.
- each tower 25 includes a vertical stack of precast reinforced concrete stairwell modules or units 30 and 30 ′.
- Each stairwell unit includes a rectangular precast reinforced concrete box-like tower section 35 and 35 ′ formed by opposite side walls 38 and opposite end walls 42 defining an open top and an open bottom.
- the primary difference between the tower sections 35 and 35 ′ is that alternate tower sections 35 have full doorway openings 44 ( FIGS. 1 , 4 and 5 ), and each tower section 35 ′ has only a partial doorway opening 46 . While the doorway openings 44 and 46 are illustrated in the end walls 42 of the tower sections 35 and 35 ′, the doorway openings may be formed or cast in corresponding side walls 38 .
- the height of the side walls 38 and end walls 42 of the tower sections 35 and 35 ′ is substantially equal to one half the vertical distance between two adjacent floors of the building 20 .
- the vertical height of the walls 38 and 42 may be approximately seven feet for a distance between floors of about fourteen feet.
- Each tower section 35 and 35 ′ has an overall length within the range of 18 feet to 25 feet and preferably about 21.5 feet, and an overall width within the range of 9 feet to 12 feet and preferably about 10.5 feet.
- each of the stairwell units 30 and 30 ′ includes a precast reinforced concrete inclined stairway 50 having steps 52 and a vertical height substantially equal to the vertical height of the walls 38 and 42 of the tower sections 35 and 35 ′.
- Each stairwell unit 30 and 30 ′ also includes a precast reinforced concrete horizontal platform 55 at the upper end of each stairway 50 and forming a stairway landing, as best shown in FIGS. 3 and 4 .
- the top surface of each platform or landing 55 is preferably flush with the top surfaces of the walls 38 and 42 of the corresponding tower section 35 and 35 ′.
- the bottom surface of each stairway 50 is flush with the bottom surfaces of the corresponding walls 38 and 42 .
- the stairway 50 and platform 55 in each stairwell unit 30 and 30 ′ has conventional steel reinforcing mats or bars, commonly referred to as rebars.
- the horizontal rebars 58 in each stairway 50 are positioned under the steps 52 and have end portions projecting into corresponding holes 62 ( FIG. 6 ) formed or drilled within the adjacent side wall 38 of the stairwell unit.
- the end portions of the rebars 58 are secured by an adhesive such as epoxy within the holes 62 after the inclined step form member 65 and bottom form sheets 67 and support rail 68 are installed within the tower section.
- the step riser form members 72 each have one end portion secured to the inclined stairway form member 65 by an angle bracket 74 and bolts and an opposite end portion temporarily secured to the adjacent wall 38 by an angled bracket 77 and anchor screws.
- FIG. 6 also shows the vertical form panel or member 82 and horizontal form panel 84 which are temporarily installed within each tower section to form the precast reinforced concrete landing platform 55 .
- Each platform 55 also has conventional concrete reinforcement mats or rods which include parallel spaced rebars 58 having end portions projecting into corresponding holes within the side walls 38 and end wall 42 where the end portions are secured by adhesive or epoxy. While only a portion of the reinforcing rods 58 are shown in FIG. 6 , it is to be understood that other steel reinforcement mats and/or rods are used in the precast concrete stairway 50 and platform 55 so that the stairway is rigidly secured to the adjacent side wall 38 , and the platform 55 is rigidly secured to the opposite side walls 38 and adjacent end wall 42 .
- each stairwell tower 25 is supported by a poured reinforced concrete floor or base pad 95 which may have a thickness of several feet. Concrete is poured within a cavity formed within the ground and containing steel reinforcement mats and/or bars. The base pad 95 may be cast within a cavity in the ground before the bottom concrete floor is cast for the building 20 .
- each of the walls 38 and 42 of each tower section 35 and 35 ′ have embedded anchor members 105 which are spaced at predetermined locations around the periphery of the tower section.
- Each of the anchor members 105 includes a steel angle member 107 and a plurality of three reinforcing bars or rebars 109 welded to the horizontal flange of the angle member 107 .
- the concrete base or floor pad 95 also has anchor members 110 ( FIG. 10 ) located under the walls 38 and 42 of the bottom stairwell unit 30 .
- Each anchor 110 includes a horizontal flat steel plate 112 and a set of four vertical reinforcing bars or rebars 114 having upper ends welded to the plate 112 and projecting downwardly into the base pad 95 .
- the anchor members 105 in the lower wall portions of the walls 38 and 42 of the stairwell unit 30 are aligned with the anchor members 110 embedded within the base pad 95 , as shown in FIGS. 2 and 11 .
- a set of shims and grout (not shown) are inserted within a gap or space 121 between the bottom surfaces of the walls 38 and 42 to ensure that the vertical walls of the bottom stairwell unit 30 are precisely plum.
- Each set of anchor members 105 and 110 is then rigidly connected by a connector member 122 in the form of a steel angle which is welded to the vertical flange of the anchor member 105 and the horizontal plate of the anchor member 110 , as shown in FIG. 11 .
- each of the stairwell modules or units 30 and 30 ′ includes an inclined metal fabricated handrail 130 which is rigidly secured to the corresponding stairway 50 .
- the anchor members 105 FIGS. 8 & 9 ) within the lower portions of the walls 38 and 42 of the second stairwell unit 30 ′ overlie the anchor members 105 embedded within the upper portions of the walls 38 and 42 of the bottom stairwell unit 30 , as shown in FIGS. 8 and 9 .
- Shims and then grout are inserted into the space 134 between the bottom surfaces of the walls 38 and 42 of the second stairwell unit 30 ′ and the corresponding walls 38 and 42 of the bottom stairwell unit 30 .
- the adjacent anchor members 105 are then rigidly connected by a rigid connector member 138 in the form of a steel plate which is welded to the aligned vertical flanges of the anchor members 105 , as shown in FIG. 9 .
- a U-shaped handrail section 140 is welded to the adjacent ends of the handrails 130 so that the handrails are continuous.
- An inclined handrail 145 ( FIG. 4 ) may also be preattached to the adjacent side wall 38 of each stairwell unit 30 and 30 ′, and these handrails 145 are connected by a horizontal hand rail 148 attached to the end wall 42 above the landing platform 55 . The above steps are repeated until all of the stairwell units 30 and 30 ′ are assembled or erected to form the stairwell tower 25 .
- each of the precast concrete stairwell units 30 and 30 ′ has substantially the same construction except for the doorway openings 44 and 46 , and the height of each stairwell unit is essentially one half the vertical distance between two adjacent floors, each of the stairwell units 30 ′ is rotated or horizontally oriented by 180 degrees with respect to the adjacent stairwell unit 30 therebelow.
- one of the stairwell towers 25 may be provided at the top with an additional stairwell unit 30 in order to provide convenient access to the roof of the building 20 after it is constructed.
- each of the towers 25 may serve as a rigid anchor for the steel frame members, thereby eliminating the need for a significant number of diagonal steel bracing members and shear members.
- the precast concrete walls 38 and 42 of selected stairwell units 30 and 30 ′ may be provided with embedded steel anchor members 152 each of which includes a vertical flat steel plate 154 .
- a set of horizontal anchor rods or bars 156 having head portions are welded to the plate 154 and project into the wall 38 or 42 at each location where it is desired to connect a horizontal steel beam or frame member 160 .
- An angular connector member or plate 162 is then welded to the plate 154 and the frame member 160 to form a rigid connection of the frame member to the wall.
- a stairwell module or unit 30 is shown with a doorway opening 44 within an end wall 42 . While the unit 30 is being lifted by the cables 118 extending from an overhead crane and being transported from the precast facility to the construction site for the building 20 , a set of cross braces 168 are temporarily secured to the walls 42 and 38 across the doorway 44 to prevent any racking or movement of the walls with respect to each other.
- each tower 25 and its method of construction in accordance with the invention provides desirable features and advantages. For example, by first constructing one or more of the stairwell towers at a building construction site, each tower provides the construction workers with convenient and safe access to all floors of the building during construction, and thereby provides protection for the erection crew for the steel frame as well as for the construction for the concrete floors. The tower also eliminates the need for temporary ladders and scaffolding and temporary railings while erecting the steel frame.
- Each of the stairwell units 30 and 30 ′ may also be economically produced at a remote precast facility where bad weather does not stop production.
- the steel frame members may be anchored to the tower or towers, thereby eliminating the need for many diagonal bracing frame members and shear wall bracing frame members within the building.
- the steel workers may also use each stairwell tower for conveniently moving their tools and materials from floor to floor during erection of the steel frame for the building.
- the mounting of each stairway railing within each stairwell unit before stacking the units also substantially simplifies the installation of a railing system.
- fire line stand pipes may be installed within the tower and connected to a water supply to facilitate fire protection during construction of the building.
- each stairwell unit with a fabricated metal stairway and landing platform which are secured to the tower walls of each stairwell unit in the event that a precast concrete stairway and landing platform are not desired or required.
- each of the stairwell units may have an oval configuration with rounded end walls instead of a rectangular configuration as shown in the drawings.
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Abstract
Description
- In the construction of multi-story commercial and industrial buildings, it is common to erect a structural steel frame for the building after the concrete footers and foundation has been poured. The steel frame defines the vertical spaces for the stairwell and elevator shafts. Typically, prefabricated steel stairways with steps and a horizontal landing for each floor are installed as the structural steel frame for the building is erected, and each steel stairway and each landing are secured by bolts or welding to steel frame members for the building. After corrugated steel floor panels are installed over the horizontal beams of the steel frame, concrete is pumped onto the steel floor panels to form each concrete floor for the building. If the steel stairway has step pans and a landing pan, concrete is manually poured into the steel pans forming the steps of the stairway and also into the steel pan forming the landing for the stairway halfway between adjacent floors. After all of the floors and stairways and landings are formed, vertical metal studding is usually installed onto the steel frame members defining the stairwell space for the building and around the stairways and landings to define the stairwell shaft. The stairwell shaft is then lined with drywall or other fire resistant sheets, and handrails are installed for the steps for each floor so that the stairwell is essentially completed except for final finishing.
- It has been proposed to form a staircase or a stairwell tower for a multi-story house or building by precasting modular staircase or stairwell components or units and then assembling or stacking the units to form a staircase or stairwell for the building. For example, U.S. Pat. No. 3,755,974, No. 3,830,026, No. 3,980,155, No. 4,248,020 and No. 5,377,778 disclose various preformed staircase or stairway modules, which may be formed of precast concrete, and with each module extending a full story of the multi-story house or building. After the modules are stacked, they form a stairway or stairwell system.
- The present invention is directed to the construction of a modular stairwell tower which is preferably constructed prior to erecting the steel frame members for a multi-story building having a number of floors. The tower includes a series of precast concrete stairwell units arranged in a stack with the number of stairwell units corresponding to twice the number of floors in the building. Each of the stairwell units includes a precast concrete tower section having vertical opposite side walls and vertical opposite end walls defining an open bottom and an open top. The walls of each tower section have a vertical height generally equal to one half the vertical distance between two successive floors of the building, and each stairwell unit includes a preformed or precast inclined stairway connected to one of the side walls of the corresponding tower section. A preformed or precast horizontal platform is located adjacent an upper end of the inclined stairway in each tower section and is connected to the side walls and one of the end walls to form a stairway landing.
- Each of the stairwell units is horizontally oriented one hundred eighty degrees relative to each adjacent stairwell unit in the stack, and one of the walls of each alternate stairwell unit in the stack defines a doorway opening. Anchor members project into and are embedded in upper and lower portions of the walls of each of the stairwell units, and the anchor members in the lower portions of the bottom stairwell unit are rigidly connected, such as by welded plates, to anchor members embedded in a concrete support floor or base for the stairwell tower. Anchor members in the upper portions of the walls are rigidly connected, such as by welded plates, to the anchor members in the lower portions of the walls of the adjacent stairwell unit thereabove.
- The modular stairwell tower of the invention provides for efficiently precasting the stairwell units away from the building site and for conveniently erecting or stacking the stairwell units with a crane. Structural steel frame members for the building may be subsequently attached to the erected stairwell tower, thereby providing stability and rigidity for the steel frame members as they are being erected. This attachment eliminates the need for a significant number of steel frame members used for bracing the steel frame as it is being erected. The modular stairwell tower of the invention also provides for convenient and safe access to all floors of the building as it is being constructed, thereby providing protection to the steel frame erection crew. The modular precast concrete stairwell tower further provides for fire rating without the need for dry wall or masonry and may be prime finished at the precasting facility or factory. In addition, fire line stand pipes may be installed within the stairwell tower to provide for fire protection during construction of the building. The construction of the stairwell tower prior to erecting the steel frame members for the building also enables workers to move tools and materials from floor to floor quickly and conveniently, thereby providing a savings in labor for constructing the building. The construction of the modular stairwell tower before erecting the frame members further eliminates the need for ladders and scaffolding and temporary railings during erection of the steel frame, further enhancing the safety aspect of the overall construction process.
- Other features and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
-
FIG. 1 is a perspective view of the multi-story commercial building having three modular stairwell towers constructed in accordance with the invention and showing in phantom the outline for the steel frame for the building; -
FIG. 2 is a perspective view of two precast concrete stairwell modules or units and illustrating the stacking of a second unit onto a first floor unit; -
FIG. 3 is a fragmentary vertical section through one of the stairwell towers, taken generally on the line 3-3 ofFIG. 1 ; -
FIG. 4 is a horizontal section of a stairwell tower, taken generally on the line 4-4 ofFIG. 3 ; -
FIG. 5 is a perspective view of a typical precast concrete stairwell module or unit used in each of the stairwell towers shown inFIG. 1 , and being transported by an overhead crane with attached temporary bracing; -
FIG. 6 is a fragmentary perspective view of a precast concrete stairwell unit and illustrating the forms and reinforcement used for forming a precast concrete stairway and horizontal landing; -
FIG. 7 is a fragmentary vertical section through a precast concrete stairwell unit and illustrating the location of steel reinforcing bars within the concrete; -
FIG. 8 is a perspective exploded view of anchor members embedded within corresponding walls of two adjacent stairwell units and with the connection member; -
FIG. 9 is a fragmentary vertical section through the embedded wall anchors shown inFIG. 8 after being connected by the connection member; -
FIG. 10 is a perspective exploded view of the anchor members and connector member for securing a wall of the bottom stairwell unit to the concrete floor support pad for the stairwell tower; -
FIG. 11 is a fragmentary section similar toFIG. 9 and showing the connection of the anchor members shown inFIG. 10 ; and -
FIG. 12 is a fragmentary vertical section through a wall of a stairwell unit and showing an embedded anchor member used for attaching a horizontal steel frame member or beam to the stairwell tower after it is constructed. -
FIG. 1 illustrates a multi-storyrectangular building 20 which will receive an erected metal frame system including vertical steel columns connected by horizontal steel frame members or beams. The beams support corrugated steel floor panels onto which concrete is poured or pumped to form multiple concrete floors within the building. As illustrated inFIG. 1 , thebuilding 20 will have four floors, but it is to be understood that the building may have more or less floors. - In accordance with the present invention, one or more precast concrete
modular stairwell towers 25 are constructed in accordance with the invention, and eachtower 25 includes a vertical stack of precast reinforced concrete stairwell modules orunits like tower section opposite side walls 38 andopposite end walls 42 defining an open top and an open bottom. The primary difference between thetower sections alternate tower sections 35 have full doorway openings 44 (FIGS. 1 , 4 and 5), and eachtower section 35′ has only apartial doorway opening 46. While thedoorway openings end walls 42 of thetower sections corresponding side walls 38. - The height of the
side walls 38 andend walls 42 of thetower sections building 20. For example, the vertical height of thewalls tower section - Referring to
FIGS. 3 , 6 and 7, each of thestairwell units inclined stairway 50 havingsteps 52 and a vertical height substantially equal to the vertical height of thewalls tower sections stairwell unit horizontal platform 55 at the upper end of eachstairway 50 and forming a stairway landing, as best shown inFIGS. 3 and 4 . The top surface of each platform orlanding 55 is preferably flush with the top surfaces of thewalls corresponding tower section FIGS. 3 and 7 , the bottom surface of eachstairway 50 is flush with the bottom surfaces of thecorresponding walls - The
stairway 50 andplatform 55 in eachstairwell unit FIGS. 6 and 7 , thehorizontal rebars 58 in eachstairway 50 are positioned under thesteps 52 and have end portions projecting into corresponding holes 62 (FIG. 6 ) formed or drilled within theadjacent side wall 38 of the stairwell unit. The end portions of therebars 58 are secured by an adhesive such as epoxy within theholes 62 after the inclinedstep form member 65 andbottom form sheets 67 andsupport rail 68 are installed within the tower section. As also shown inFIG. 6 , the stepriser form members 72 each have one end portion secured to the inclinedstairway form member 65 by anangle bracket 74 and bolts and an opposite end portion temporarily secured to theadjacent wall 38 by anangled bracket 77 and anchor screws. -
FIG. 6 also shows the vertical form panel ormember 82 andhorizontal form panel 84 which are temporarily installed within each tower section to form the precast reinforcedconcrete landing platform 55. Eachplatform 55 also has conventional concrete reinforcement mats or rods which include parallel spacedrebars 58 having end portions projecting into corresponding holes within theside walls 38 andend wall 42 where the end portions are secured by adhesive or epoxy. While only a portion of the reinforcingrods 58 are shown inFIG. 6 , it is to be understood that other steel reinforcement mats and/or rods are used in the precastconcrete stairway 50 andplatform 55 so that the stairway is rigidly secured to theadjacent side wall 38, and theplatform 55 is rigidly secured to theopposite side walls 38 andadjacent end wall 42. - As shown in
FIG. 3 , eachstairwell tower 25 is supported by a poured reinforced concrete floor orbase pad 95 which may have a thickness of several feet. Concrete is poured within a cavity formed within the ground and containing steel reinforcement mats and/or bars. Thebase pad 95 may be cast within a cavity in the ground before the bottom concrete floor is cast for thebuilding 20. - Referring to
FIGS. 2 and 8 , the upper and lower portions of each of thewalls tower section anchor members 105 which are spaced at predetermined locations around the periphery of the tower section. Each of theanchor members 105 includes asteel angle member 107 and a plurality of three reinforcing bars orrebars 109 welded to the horizontal flange of theangle member 107. The concrete base orfloor pad 95 also has anchor members 110 (FIG. 10 ) located under thewalls bottom stairwell unit 30. Eachanchor 110 includes a horizontalflat steel plate 112 and a set of four vertical reinforcing bars orrebars 114 having upper ends welded to theplate 112 and projecting downwardly into thebase pad 95. - After the first or bottom precast
concrete stairwell unit 30 is positioned on the base pad 95 (FIG. 2 ) with the use of an overhead crane havingsupport cables 118, theanchor members 105 in the lower wall portions of thewalls stairwell unit 30 are aligned with theanchor members 110 embedded within thebase pad 95, as shown inFIGS. 2 and 11 . A set of shims and grout (not shown) are inserted within a gap orspace 121 between the bottom surfaces of thewalls bottom stairwell unit 30 are precisely plum. Each set ofanchor members connector member 122 in the form of a steel angle which is welded to the vertical flange of theanchor member 105 and the horizontal plate of theanchor member 110, as shown inFIG. 11 . - Referring to
FIGS. 3-5 , each of the stairwell modules orunits handrail 130 which is rigidly secured to the correspondingstairway 50. After thesecond stairwell unit 30′ is rotated one hundred eighty degrees relative to thebottom stairwell unit 30 and is positioned in stacked relation on the first or bottom stairwell unit 30 (FIG. 2 ) with the aid of theoverhead crane cables 118, the anchor members 105 (FIGS. 8 & 9 ) within the lower portions of thewalls second stairwell unit 30′ overlie theanchor members 105 embedded within the upper portions of thewalls bottom stairwell unit 30, as shown inFIGS. 8 and 9 . Shims and then grout are inserted into thespace 134 between the bottom surfaces of thewalls second stairwell unit 30′ and thecorresponding walls bottom stairwell unit 30. Theadjacent anchor members 105 are then rigidly connected by arigid connector member 138 in the form of a steel plate which is welded to the aligned vertical flanges of theanchor members 105, as shown inFIG. 9 . - After the
second stairwell unit 30′ is rigidly connected to thefirst stairwell unit 30, as shown inFIG. 3 , aU-shaped handrail section 140 is welded to the adjacent ends of thehandrails 130 so that the handrails are continuous. An inclined handrail 145 (FIG. 4 ) may also be preattached to theadjacent side wall 38 of eachstairwell unit handrails 145 are connected by ahorizontal hand rail 148 attached to theend wall 42 above thelanding platform 55. The above steps are repeated until all of thestairwell units stairwell tower 25. - Since each of the precast
concrete stairwell units doorway openings stairwell units 30′ is rotated or horizontally oriented by 180 degrees with respect to theadjacent stairwell unit 30 therebelow. This requires that the embeddedanchor members 105 within the upper and lower portions of thewalls strength stairwell tower 25. As shown inFIG. 1 , one of the stairwell towers 25 may be provided at the top with anadditional stairwell unit 30 in order to provide convenient access to the roof of thebuilding 20 after it is constructed. - As mentioned above, it is desirable to construct or erect each of the modular stairwell towers 25 before the steel framing or frame members are erected for the
building 20. In this manner, each of thetowers 25 may serve as a rigid anchor for the steel frame members, thereby eliminating the need for a significant number of diagonal steel bracing members and shear members. Thus referring toFIG. 12 , the precastconcrete walls stairwell units steel anchor members 152 each of which includes a verticalflat steel plate 154. A set of horizontal anchor rods or bars 156 having head portions are welded to theplate 154 and project into thewall frame member 160. An angular connector member orplate 162 is then welded to theplate 154 and theframe member 160 to form a rigid connection of the frame member to the wall. - Referring to
FIG. 5 , a stairwell module orunit 30 is shown with adoorway opening 44 within anend wall 42. While theunit 30 is being lifted by thecables 118 extending from an overhead crane and being transported from the precast facility to the construction site for thebuilding 20, a set of cross braces 168 are temporarily secured to thewalls doorway 44 to prevent any racking or movement of the walls with respect to each other. - From the drawings and the above description, it is apparent that a
modular stairwell tower 25 and its method of construction in accordance with the invention provides desirable features and advantages. For example, by first constructing one or more of the stairwell towers at a building construction site, each tower provides the construction workers with convenient and safe access to all floors of the building during construction, and thereby provides protection for the erection crew for the steel frame as well as for the construction for the concrete floors. The tower also eliminates the need for temporary ladders and scaffolding and temporary railings while erecting the steel frame. Each of thestairwell units - While the method and form of modular tower herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to the precise method and tower described, and that changes may be made therein without departing from the scope and spirit of the invention as defined in the appended claims. For example, it is within the scope of the invention to provide each stairwell unit with a fabricated metal stairway and landing platform which are secured to the tower walls of each stairwell unit in the event that a precast concrete stairway and landing platform are not desired or required. Also, each of the stairwell units may have an oval configuration with rounded end walls instead of a rectangular configuration as shown in the drawings.
Claims (29)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/080,509 US20090249714A1 (en) | 2008-04-03 | 2008-04-03 | Precast concrete modular stairwell tower |
PCT/US2008/007051 WO2009123600A1 (en) | 2008-04-03 | 2008-06-05 | Precast concrete modular stairwell tower |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/080,509 US20090249714A1 (en) | 2008-04-03 | 2008-04-03 | Precast concrete modular stairwell tower |
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US20090249714A1 true US20090249714A1 (en) | 2009-10-08 |
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US12/080,509 Abandoned US20090249714A1 (en) | 2008-04-03 | 2008-04-03 | Precast concrete modular stairwell tower |
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WO (1) | WO2009123600A1 (en) |
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US20150113885A1 (en) * | 2012-05-03 | 2015-04-30 | Global Owl Limited | Method of erecting polygonal reinforced enclosure in situ |
US20150233108A1 (en) * | 2014-03-26 | 2015-08-20 | Ii Richard John Eggleston | Stackable tower shaft wall stair unit and method |
US10246313B2 (en) * | 2015-07-31 | 2019-04-02 | Vehicle Service Group, Llc | Precast concrete pit |
US20190256333A1 (en) * | 2018-02-19 | 2019-08-22 | Stertil B.V. | Modular Pit Structure for a Lifting System, Such Lifting System and Method for Building Such Pit Structure |
US20190284795A1 (en) * | 2018-03-14 | 2019-09-19 | Andy Vanaman | Modular Egress System |
US10487493B2 (en) | 2017-05-12 | 2019-11-26 | Innovative Building Technologies, Llc | Building design and construction using prefabricated components |
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US20150113885A1 (en) * | 2012-05-03 | 2015-04-30 | Global Owl Limited | Method of erecting polygonal reinforced enclosure in situ |
US20150233108A1 (en) * | 2014-03-26 | 2015-08-20 | Ii Richard John Eggleston | Stackable tower shaft wall stair unit and method |
US9249566B2 (en) * | 2014-03-26 | 2016-02-02 | Ii Richard John Eggleston | Stackable tower shaft wall stair unit and method |
US11060286B2 (en) | 2014-08-30 | 2021-07-13 | Innovative Building Technologies, Llc | Prefabricated wall panel for utility installation |
US11054148B2 (en) | 2014-08-30 | 2021-07-06 | Innovative Building Technologies, Llc | Heated floor and ceiling panel with a corrugated layer for modular use in buildings |
US10975590B2 (en) | 2014-08-30 | 2021-04-13 | Innovative Building Technologies, Llc | Diaphragm to lateral support coupling in a structure |
US10246313B2 (en) * | 2015-07-31 | 2019-04-02 | Vehicle Service Group, Llc | Precast concrete pit |
US10508442B2 (en) | 2016-03-07 | 2019-12-17 | Innovative Building Technologies, Llc | Floor and ceiling panel for slab-free floor system of a building |
US10961710B2 (en) | 2016-03-07 | 2021-03-30 | Innovative Building Technologies, Llc | Pre-assembled wall panel for utility installation |
US10676923B2 (en) | 2016-03-07 | 2020-06-09 | Innovative Building Technologies, Llc | Waterproofing assemblies and prefabricated wall panels including the same |
US10900224B2 (en) | 2016-03-07 | 2021-01-26 | Innovative Building Technologies, Llc | Prefabricated demising wall with external conduit engagement features |
US11098475B2 (en) | 2017-05-12 | 2021-08-24 | Innovative Building Technologies, Llc | Building system with a diaphragm provided by pre-fabricated floor panels |
US10487493B2 (en) | 2017-05-12 | 2019-11-26 | Innovative Building Technologies, Llc | Building design and construction using prefabricated components |
US10724228B2 (en) | 2017-05-12 | 2020-07-28 | Innovative Building Technologies, Llc | Building assemblies and methods for constructing a building using pre-assembled floor-ceiling panels and walls |
US11225403B2 (en) * | 2018-02-19 | 2022-01-18 | Stertil B.V. | Modular pit structure for a lifting system, such lifting system and method for building such pit structure |
US20190256333A1 (en) * | 2018-02-19 | 2019-08-22 | Stertil B.V. | Modular Pit Structure for a Lifting System, Such Lifting System and Method for Building Such Pit Structure |
US20190284795A1 (en) * | 2018-03-14 | 2019-09-19 | Andy Vanaman | Modular Egress System |
KR102105457B1 (en) * | 2018-05-29 | 2020-04-28 | 한국건설기술연구원 | Building Core System using Precast Concrete Box Shaped Modules with Connection Hardware at Corners And Core System Construction Method Using Thereof |
KR20190135671A (en) * | 2018-05-29 | 2019-12-09 | 한국건설기술연구원 | Building Core System using Precast Concrete Box Shaped Modules with Connection Hardware at Corners And Core System Construction Method Using Thereof |
WO2020101735A1 (en) * | 2018-11-14 | 2020-05-22 | Innovative Building Technologies, Llc | Modular stairwell and elevator shaft system and method |
US11913217B2 (en) * | 2020-04-27 | 2024-02-27 | Randall Offsite Construction, Inc. | Structures for use in erecting multistory buildings and methods for making such structures |
US11230837B2 (en) * | 2020-04-27 | 2022-01-25 | Randall Engineered Wall Systems, Inc. | Structures for use in erecting multistory buildings and methods for making such structures |
US20220162847A1 (en) * | 2020-04-27 | 2022-05-26 | Randall Engineered Wall Systems, Inc. | Structures for Use in Erecting Multistory Buildings and Methods for Making Such Structures |
KR20220037606A (en) * | 2020-09-18 | 2022-03-25 | 주식회사 케이씨산업 | Precast Concrete Modular And Joint Structure with Core System Wall |
KR20220037603A (en) * | 2020-09-18 | 2022-03-25 | 주식회사 케이씨산업 | Precast Concrete Modular, Vertical Joint Structure using Precast Concrete Modular And Horizontal Joint Structure using Precast Concrete Modular |
KR102429153B1 (en) * | 2020-09-18 | 2022-08-05 | (주)케이씨산업 | Precast Concrete Modular, Vertical Joint Structure using Precast Concrete Modular And Horizontal Joint Structure using Precast Concrete Modular |
KR102429154B1 (en) * | 2020-09-18 | 2022-08-05 | (주)케이씨산업 | Precast Concrete Modular And Joint Structure with Core System Wall |
KR20220051906A (en) * | 2020-10-19 | 2022-04-27 | 이홍재 | Precast Concrete Modular |
WO2022085856A1 (en) * | 2020-10-19 | 2022-04-28 | 이강주 | Box-type pc modular structure |
KR102429975B1 (en) * | 2020-10-19 | 2022-08-08 | 이홍재 | Precast Concrete Modular |
CN113089949A (en) * | 2021-04-12 | 2021-07-09 | 陕西省建筑设计研究院(集团)有限公司 | Construction method of concrete main body structure assembled sliding steel stair |
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