US3466817A - Multilevel spiral building structure - Google Patents

Description

Sept. 16, 1969 c, HAGEL Y MULTILEVEL SPIRAL BUILDING STRUCTURE 2 Sheets-Sheet 1 Filed NOV. 16, 1966 FIG. 6.

INVENTOR CARL HEINRICH HAGEL W 9 4 W ATTORNEYS.

c. H. HAGEL MULTILEV EL SPIRAL BUILDING STRUCTURE Sept. 16, 1969 2 Sheets-Sheet 2 Filed Nov. 16, 1966 INVENTOR CARL HEINRICH HAGEL 5 AITOZNEYi 2i United States Patent 3,466,817 MULTILEVEL SPIRAL BUILDING STRUCTURE Carl Heinrich Hagel, Eintrachtstrasse 22/24, Dortmund, Germany Filed Nov. 16, 1966, Ser. No. 594,826 Int. Cl. E04h 1/04 US. Cl. 5230 15 Claims ABSTRACT OF THE DISCLOSURE A spirally disposed multifloored building having a multiplicity of compartments disposed about said spiral wherein said compartments are defined by a series of alternating horizontal members and wall members wherein the wall members are substantially L-shaped with a first portion defining a portion of a chordal plane of said spiral and a second portion which is generally transverse to the first portion.

This invention relates in general to the building construction art, and more particularly to an elevated building structure having modular compartments arranged in spirally ascending succession. The building structure of the invention is designed for assembly from pluralities of two basic types of modular elements that are connected to one another in alternate repeating order. These basic modular elements are specially designed wall members and horizontal partition members that are interlockingly connected in alternate repeating sequence to define a building structure having a plurality of compartments, each bounded by a pair of opposite Wall members and by a pair of opposite horizontal partition members, and arranged in succession along an ascending helical spiral path.

This invention provides a modular unit construction multistory spirally wound building made of two structural elements in succeeding alternating arrangement. One of these members is substantially horizontal, and the other, which is the load-bearing section, is vertical and substantially L-shaped, with an arm of the L being generally parallel to or intersected with the axis of the spiral, and the other arm of the L being generally concentric to the spiral. It will be appreciated that the characterizations of the directions of the arms of the L-shaped member are approximate and define the configuration without being absolutely mathematically limiting thereon.

According to a preferred embodiment of the invention, the wall and horizontal partition members are dimensioned to define an assembled building having a generally open interior well that extends vertically throughout the height of the building and is centrally located therein. This well is generally cylindrical in form and is surrounded laterally by an ascending spiral ramp constituted by laterally adjoining horizontal partition members, and serves to accommodate the installation of an elevator which services the building compartments, all of which can be entered from the ramp. Since the entrances of all building compartments are arranged around the well, an elevator which travels up and down within the well guided along a spiral track supported by the surrounding spiral ramp formed by the horizontal partition members is preferably used, although any suitable conventional elevator can be installed in the well.

This application is related to a prior co-pending application Ser. No. 442,645, filed Mar. 25, 1965 by Carl Heinrich Hagel now Patent No. 3,419,161, which application gives details of such special type of elevator as will be useful in understanding the installation and use thereof in a building structure having a central well of the type described herein.

Patented Sept. 16, 1969 The horizontal partition members are disposed for extension, at least partly, in laterally adjoining relation and radially toward the axis of the spiral path on which the compartments are located. Each horizontal partition member has an arcuate edge portion facing the spiral axis, which is ordinarily vertical, and these edge portions are supported in consecutive end-wise adjoining relation to one another by wall members so as to define the ascending spiral ramp. This spiral ramp is of the same pitch as that of the spiral compartment location path, such pitch being equal to the uniform height of the individual compartments as established by the dimensions of the wall members. The spiral elevator guide track which is disposed in the well to guide an elevator moveable therein likewise has the same pitch as the spiral ramp formed by the adjoining horizontal partition members, and is connected thereto for support thereby.

To allow the horizontal partition members and wall members to be made with respectively common dimensions regardless of where they are installed in the building, with the exception of certain wall members which serve to support the first flight of compartments, the individual compartments above the first flight are geometrically similar and all compartments throughout the building are generally wedge-shaped in plan form.

In elevation, each compartment is bounded by a pair of horizontal partition members, the lower one of which serves as both the floor of the compartment and the ceiling or roof of an underlying compartment, with the upper horizontal partition member in the pair serving as the ceiling of the same compartment and the floor of the overlying compartment, if any such overlying compartment is provided. Similarly, each compartment is bounded laterally by a pair of wall members which are generally vertical, and serve to separate adjacent compartments.

Preferably, the compartments are located at equal angular intervals along the ascending spiral path and extend therealong over an angular space that is an integral proportion of one complete spiral path flight. With such angular spacing, compartments located at similar angular stations in each successive spiral flight path will be aligned in vertically superposed groups. This enables the wall members associated with each group of vertically superposed compartments to be connected to one another in edge-wise alignment to form load bearing columnar walls that extend vertically down to the base of the building.

By reason of its unique construction, the building structure of the invention is adapted to a particularly simplified method of assembly not requiring the use of a large crane hoist of the type normally used for erecting multistory buildings. However, conventional methods of assembly and erection can also be used, if desired.

Starting at the bottom, the compartments of the first flight are erected, thereby providing around the well area an initial helical ramp capable of supporting a one turn section of the elevator guide track. The elevator can thus be placed upon the guide track for use in carrying up the wall and horizontal partition members that are to be used in erecting the second subsequent flights of compartments.

A crane hoist of limited size, but of sufficient swing capability for transferring such wall and partition members from the elevator and placing them in their intended erection positions, can be advantageously mounted on the elevator to expedite the progress of construction.

After the upper horizontal partition members for the first flight of compartments are in place, the wall members for the second flight compartments are erected thereupon, and all connections between the upper horizontal partition members of the first flight and the wall members of the first and second flights are made. With the Wall members of the second flight in place, the upper horizontal partition members for the second flight are laid each between adjacent pairs of wall members for support thereupon, the lower horizontal partition members for the second flight and the upper horizontal partition members for the first flight being one and the same for each respective set of superposed first and second flight compartments. The third and subsequent flights of compart ments are erected in a similar manner.

As is well known in civil engineering, in a multistory building, the total loading upon the lowermost and each intermediate story increases with building height as each new story is added. To preserve a generally similar, and preferably uniform geometry among the several modular wall and horizontal partition members used throughout the building of the invention, all of such wall and partition members can be designed to withstand the stresses they will experience if assembled into a lowermost flight of compartments in a building having a given maximum number of compartment flights. In this way, modular wall and partition members can be prefabricated to uniform sets of dimensions for assembly anywhere within a building having a number of compartment flights up to the maximum. However, should it be undesirable to provide such overdesign in wall and partition members used for upper flights, the wall and partition members used throughout the building can still be designed for uniform interconnection dimensions, but with increased reinforcement and/or load bearing cross-section areas for safe use in lower compartment flights. For example, the wall and partition members used in the lower compartment flights can be thickened or otherwise reinforced at regions having no etfect upon their connection to one another.

The individual wall members, according to a preferred embodiment of the invention, are of monolithic construction, and are generally L-shaped in plan form. A generally rectangular, flat slab constitutes the major portion of the long side of each wall member, and a bent, or curved slab section constitutes the short side of the wall member. In the assembly of the building compartments, the flat slab portions of the wall members are erected vertically in radial alignment with the axis of the compartment location spiral, and the bent slab portions are thus oriented tangentially with the spiral path to define exterior wall sections of the building.

Each wall member is provided with thickened columnlike portions which extend vertically along the inner edge of the flat slab, along the outer edge thereof whereat the flat and bent slab portions are joined, and along the free end of the bent slab. These column portions are notched to receive and constrain matching portions of the horizontal partition members, and to position adjacent horizontal partition members in the proper elevation spacing to each other such that the partition members of successive compartments join along the intended spiral path.

With the type of construction afforded by such wall and partition members, a building having any number of spirally arranged compartments up to a maximum dictated by load limitations, can be simply and economically erected, either at one construction stage, or in several construction stages wherein additional compartments are added as desired. As distinguished from conventional rnultistory building construction, the building structure of the invention need not be erected with an integral number of compartment flights, and additional compartments can be added one at a time Without any interference with those already existing.

The two basic types of modular Wall and horizontal partition members thus mentioned define the primary outlines and enclosure of the building and compartments. However, additional panels and partitions can be added as desired to provide selected variations and subdivisions within individual compartments.

These modular wall and partition members can be constructed with a variety of materials, such as steel, con- 4 crete, etc., but expediently are of prefabricated steel-reinforced concrete construction.

It is therefore, an object of the invention to provide a building structure having a plurality of compartments arranged successively along an ascending helical spiral path.

Another object of the invention is to provide a building structure as aforesaid which can be assembled from prefabricated modular wall and horizontal partition members.

A further object of the invention is to provide a building structure as aforesaid wherein the spirally arranged compartments are arranged in vertically superposed groups to position the wall members of each superposed group into vertical alignment to function as columns which carry the loading of the compartment groups down to a base footing.

A further object of the invention is to provide a building structure as aforesaid in which additional compartments can be added one at a time as desired.

A further object of the invention is to provide a building structure as aforesaid having a centrally located open interior well extending throughout its height to accommodate the installation of an elevator accessible to all compartments within the building.

Still another and further object of the invention is to provide a building structure as aforesaid wherein the horizontal partition members defining the compartment ceilings and floors are extended in consecutive adjoining relation to provide a spiral ramp surrounding the interior well to support a similar spiral guide track for an elevator moveable therein.

Other and further objects and advantages of the invention will become apparent from the following detailed description and accompanying drawings in which:

FIG. 1 is a perspective view of a completed building structure according to a preferred embodiment of the invention as viewed from above.

FIG. 2 is a perspective view of a portion of the building structure of FIG. 1, as seen in its initial stage of construction, and illustrating in greater detail the arrangement of the modular wall and horizontal partition members as they are assembled to form the various compartments of the building.

FIG. 3 is a plan view of a typical modular wall member used in the building of FIG. 1.

FIG. 4 is an elevation view of the wall member shown in FIG. 3, as seen looking parallel to line IVIV therein.

FIG. 5 is a plan view of a typical modular horizontal partition member used in the building of FIG. 1.

FIG. 6 is an edgewise elevation view of the horizontal partition member shown in FIG. 5, as seen looking parallel to line VI-VI therein.

As exemplified by FIGS. 1 and 2, the building structure 10 of the invention features a plurality of modular wall members 11 and a plurality of modular horizontal partition members 12 which are connected in an alternating repeating sequence to the wall members 11 to define an elevated building structure 10 having a plurality of compartments 13 arranged in succession along an ascending helical spiral path.

Each compartment 13 is bounded in elevation by a pair of partition members 12 and bounded laterally by a pair of wall members 11. In this respect, each partition member 12 associated with a compartment 13 located on a spiral path flight intermediate between the uppermost and lowermost defines both the ceiling or roof of one compartment and the floor of an adjacently overlying compartment, i.e. for a typical intermediate flight compartment 13, the upper partition member 12 is the ceiling for that compartment 13 and also the floor of the adjacently overlying compartment 13, with the lower partition member 12 serving as both the floor for the first-mentioned compartment 13 and the ceiling of the adjacently underlying compartment 13.

For purposes of example and illustration, the building is shown in FIG. 1 as having its compartments 13 arranged along a left-handed spiral path, and with some of the uppermost flight of compartments 13 left uncovered.

It should be understood that the building 10 can a1- ternatively be constructed with compartments 13 arranged along a right-handed spiral path simply by interchanging the height dimensions of certain portions of the wall members 11, as will be explained hereinafter. As to those uppermost compartments 13 shown uncovered, it should be noted that they can be covered simply by placing additional partition members 12 upon and between the adjacent wall members 11 associated with such open compartments 13.

The building 10 is constructed with a generally open, centrally located well 14 which extends vertically from the base 15 throughout the height of the building 10. This well 14 is generally cylindrical and is surrounded laterally by an ascending spiral ramp 16 defined by the inwardly directed portions 17 of adjoining partition members 12. These inward portions 17 are arranged to extend toward the central axis of well 14 from the interior vertical edges 18 of the wall members, and laterally adjoin one another such that their arcuate edge portions 19 are disposed in endwise adjoining relation.

The ascending spiral ramp 16 thus defined can be either a generated surface continuously smooth over its length or can be a stepwise approximation to such theoretical generated surface, as exemplified in FIG. 2.

To provide a ramp 16 which is a generated spiral ribbon surface, the fabrication of the partition members 12 is somewhat complicated. According to a preferred embodiment of the invention, the upper surfaces of the partition members are generally flat, and arranged to be level with the horizontal to provide compartment 13 floors which are likewise horizontal. The partition member portions 17 which constitute the ramp 16 running around well 14 and leading to the interior sides of all the compartments 13 need not be exactly horizontal since the ramp 16 is merely an extension of the compartment 13 floors. However, the partition members 12 are more expediently made with their upper surfaces continuously flat. To provide a generated spiral ramp 16 in combination with horizontal compartment 13 floors, it is therefore necessary to make the partition members 12 with upper surfaces which over portions 17 conform to a generated spiral surface, and over their remaining portions conform to a flat horizontal surface.

For purposes of simplicity and economy, the partition members 12 are constructed so that their portions 17 are arranged to laterally adjoin one another in a stepwise fashion, thus allowing the entire upper surface of said partition members 12 to be flat and horizontal.

However, as can be noted from FIGS. 1 and 2, and in more detail from FIG. 6, the partition members 12 are provided each with a spiral ledge portion 20 along their arcuate edge portions 19, and these ledge portions 2 are arranged to adjoin one another in flush endwise relation so as to define a continuously smooth spiral ledge ascending around the boundary of well 14, and having a pitch the same as that of the spiral location path for compartments 13.

It should be noted that the compartments 13 are preferably uniform in height and that their uniform height is equal to the pitch of their spiral location path.

In general, any desired number of compartments 13 can be provided per flight, but such compartments 13 are preferably similar at least as to their shell geometry established by the wall and partition members 11 and 12. With such an arrangement, the compartments 13 will be located at equal angular intervals along their spiral location path. As exemplified by FIGS. 1 and 2, the compartments 13 are so dimensioned that an integral number of compartments 13, in this case 16, are contained within each complete flight or turn of the spiral location path.

In this way, compartments 13 located at similar angular stations in each successive flight will be positioned in vertically superposed relation rather than in an overlapping relation as would occur in the case where the number of compartments 13 per flight is not an integer.

The wall members 11 associated with each group of vertically superposed compartments 13 will thus be positioned in edgewise alignment with one another, such that when connected together either directly or indirectly through partition members 12, will define load bearing columnar walls extending vertically throughout the height of the building 10, with each of such columnar walls defining the lateral boundaries of adjacent groups of vertically superposed compartments 13.

The continuous spiral ledge defined by the portions 20 of the partition members 12 is used as a spiral guide track to guide an elevator 21 for movement up and down within the well 14. Details of the elevator 21 are given in the prior copending application Ser. No. 442,645 of Carl Heinrich Hagel, filed Mar. 25, 1965 now Patent No. 3,419,161. A variety of detail construction options are available with regard to such elevator guide track. The portions 20 can be prefabricated from reinforced concrete, as can be the entire partition member 12, as well as the wall members 11, and a steel track section 22 can be installed for extension along each portion 20 at the time the partition member 12 is cast.

Such steel track sections 22, of course, have the same pitch as the ramp 16 and compartment 13 location path, regardless of whether they are prefabricated with partition members 12 or installed by any conventional means (not shown).

Although the shell structure of the building 10 illustrates an arrangement wherein the wall members 11 and partition members 12 define wedge-shaped compartments 13 that are oriented radially about the basic spiral path axis, and which compartments 13 are open at both radial ends and along the side which faces toward the interior of the L-shaped wall members 11, such basic shell structure can be supplemented with conventional panels and partitions (not shown) to completely enclose the individual compartments 13 as desired. The building 10 illustrated herein is particularly adapted for use as a garage, and therefore, such open construction is more appropriate for economy. If it is desired to adapt one or more compartments 13 for use as dwelling rooms or apartments, additional wall panels and/or floor panels (not shown) can be installed to close off the open shafts defined by the stacked groups of wall members 11, and to close off the inner and outer radial ends of such compartments 13.

FIG. 2 illustrates how the erection of building 10 is started, using a generally level base 15.

Because a vertically extending spiral path cannot be tangent to a base 15 plane perpendicular to its axis, the wall members 11 used for the first flight of compartments 13 are of progressively increasing height to support the lower partition members 12 for such compartments 13 in their intended adjoining, spirally ascending pattern. After the first flight of compartments 13 has been erected, wall members 11 of uniform height are used.

However, if it is desired to use uniform height wall members 11 throughout the entire building 10, this can be done simply by using a base having a one turn spiral support surface of the same pitch as the compartment 13 location path.

From FIGS. 3 and 4 taken together with FIGS. 1 and 2, it can be noted that the wall members 11 have one pair of opposite edge portions 23a and 23]; disposed for respective engagement with the partition members 12 defining the floor and ceiling of the compartment 13 associated with each wall member 11, and these edge portions 23 function to secure such partition members 12 in fixed relation to each other.

The first flight of compartments can be erected as shown in FIG. 2 simply by aligning the wall members 11a radially with the intended spiral axis at their respective angular stations, and placing partition members 12:: between and upon adjacent wall members 11a. With the left-handed spiral ascension shown in FIG. 2, each first flight floor partition member 12a is supported on its right side by the upper edge portion 23b of the wall member 11a to its right, and supported on its left side by the upper edge portion 24b of the wall member 11a to its left, said upper edge portions 2412 being actually in two parts due to the L-shaped plan form of the wall members 11a as Well as 11. To better illustrate the placing of the wall members 11a, some of the partition members 12a have been removed in FIG. 2, and it should be understood that between each two adjacent wall members 11a of the first flight, a partition member 12a is placed and secured thereto by any suitable conventional fastening means (not shown). For each wall member 11, 11a, the edge portion 23b is elevated above edge portion 2412 by a distance corresponding to the pitch of the compartment 13 location path divided by the number of compartments 13 per flight, in the case of compartments 13 occupying a uniform angular space. For example, with 16 compartments per flight and a path pitch of 8 feet, i.e. to provide a basic compartment height of 8 feet, the edge portions 23b would be located 6 inches above corresponding edge portions 2411.

In general, the wall members 11a are used to support the floor defining partition members 12a associated with the first flight of compartments 13, and to provide the start for erecting the other compartments 13 along the intended spiral path. Consequently, once the partition members 12a are erected in place, the regular, uniform dimensioned wall members 11 are used, together with partition members 12 (which are actually the same in dimensions as those designated by 12a), to erect subsequent flights of compartments 13.

Erection of each subsequent flight of compartments 13 is accomplished by placing wall members 21 with their lower edge portions 24a resting upon the left side of partition members 12 or 12a associated with compartments 13 to the right, and with their lower edge portions 23a resting upon the right side of partition members 12 or 12a associated with compartments to the left. The partition members 12 which define both the ceiling of individual compartments 13 in one flight and the floor of overlying compartments 13 in the next flight are installed upon the upper edge portions 23b and 24b of Wall members 11 associated with the one flight in the same manner as are the partition members 12a upon the wall members 11a.

The invention provides a unique combination of modular wall members 11 and horizontal partition members 12 which can be used generally to construct buildings of various sizes. These wall members 11 are generally L- shaped in plan form as shown by FIG. 3 and have each a slab 31 which, when the wall member 11 is erected, is oriented radially with respect to the axis of the spiral compartment location path. A second slab 32, joined edgewise to the radial slab 31, is oriented in a tangential direction with respect to the spiral path and serves to establish a generally cylindrical building outline.

The angular positioning of adjacent compartments 13 horizontally is established by the angular spacing between the upper and lower pairs of edge surfaces 23b and 24b, and 23a and 24a, respectively. For location of the compartments 13 along a spiral path the pairs of horizontal partition members 12 associated with adjacent compartments 13 must be displaced horizontally a predetermined distance apart and also displaced apart in elevation by a distance corresponding to their horizontal angular separation, these angular or azimuth and elevation separa tions are directly related to the pitch of the spiral location path and the number of compartments 13 per flight Cir thereof. For example, with a uniform compartment 13 height of 8 feet and with 16 compartments per flight, the corresponding upper and lower partition members of adjacent compartments 13 are displaced 6 inches apart in elevation and consequently, the partition member edge surfaces 23b and 23a are 6 inches higher than the corresponding edge surfaces 24b and 24a, for the case of the left-handed spiral location path used in the building 10. If it is desired to provide a building wherein the compartments 13 are arranged along a right-handed spiral path, this can be done simply by making the edge surfaces 2412 and 24a respectively 6 inches higher than the edge surfaces 23b and 23a.

The angular separations between the edge surfaces 23a and 24a, and between the edge surfaces 23b and 24a correspond to the angular portion of the spiral path occupied by the individual compartments 13.

From the foregoing description of the invention in terms of a particular illustrative embodiment, it will become apparent to the artisan that the invention is susceptible of numerous obvious modifications and variations.

What is claimed is:

1. A building structure comprising a plurality of modular, horizontal partition members and a plurality of modular generally L-shaped w-all members connected in alternating, repeating sequence, along an upwardly spiraling path thereby defining a multifloored, generally spirally disposed building having a plurality of compartments therein disposed at different elevations along said path, each of which compartments being bounded by a pair of said wall members and by a pair of said horizontal partition members which compartments are arranged in succession along the spiral path, each said generally L-shaped wall member including a first portion defining a plane disposed in generally chordal relation to the periphery of said building and a second integral portion generally defining a plane normal to the plane of the first portion and extending inwardly of the first portion toward the longitudinal axis of said spiral.

2. The building structure according to claim 1 wherein said wall and horizontal partition members are connected to one another to define a building structure having a generally open, centrally located and vertically extending interior Well.

3. The building structure according to claim 2 wherein said horizontal partition members are disposed for extension in laterally adjoining relation toward the axis of said spiral path and have arcuate edge portions facing said axis and disposed in consecutive endwise adjoining relation to define a generally cylindrical open interior well surrounded laterally by an ascending spiral ramp constituted by said horizontal partition members.

4. The building structure according to claim 3 wherein said wall members and horizontal partition members are disposed to define similar bounded compartments located at equal angular intervals along said ascending spiral path with an integral number of compartments being contained within each complete flight of said spiral path to position compartments located at similar angular stations in each successive spiral path flight in vertical superposed relation to one another.

5. The building structure according to claim 4 wherein the wall members associated with each group of vertically superposed compartments are connected in edgewise alignment to one another to define load bearing columnar walls extending vertically throughout the height of the building and defining the lateral boundaries of adjacent groups of vertically superposed compartments.

6. The building structure according to claim 5 wherein said compartments are uniform in height and are located along a spiral path having a pitch equal to such compartment height.

'7. The building structure according to claim 5 wherein one horizontal partition member of the pair thereof associated with each compartment defines the floor of said compartment and the ceiling of the adjacent underlying compartment, and the other horizontal partition member of said pair defines the ceiling of said compartment and the floor of the adjacent overlying compartment.

8. The building structure according to claim 5 wherein each of said wall members have a pair of opposite edge portions disposed for respective engagement with the horizontal partition members defining the floor and ceiling of the compartment associated with such wall member, to secure said horizontal partition members in fixed relation to each other.

9. The building structure according to claim 5 including a spiral guide track disposed in said interior well to guide an elevator movable therein, said guide track having the same pitch as said spiral ramp and being connected thereto for support thereby.

10. The building structure accord ng to claim 5 wherein said wall members and horizontal partition members are disposed to define wedge-shaped compartments oriented radially about said spiral path axis.

11. The building structure according to claim 1 wherein said modular wall members are generally L-shaped in plan form and include a first slab oriented radially with respect to the axis of said spiral path and a second slab connected to the first and oriented in a tangential direction with respect to said path to establish a generally cylindrical building outline.

12. The building structure according to claim 1 wherein said modular wall members each have a pair of upper surfaces displaced horizontally a predetermined angular distance apart from each other and displaced in elevation a distance apart from each other corresponding to their angular separation to receive for connection thereto a horizontal partition member associated with one compartment and a horizontal partition member associated with an adjacent compartment to support said partition members at a combined horizontal angular and elevation spacing corresponding to that of their respectively associated compartments along said spiral path.

13. The building structure according to claim 12 wherein said modular wall members each have a pair of lower surfaces displaced horizontally apart from each other and displaced in elevation apart from each other by distances respectively equal to the angular and elevation displacement distances of said upper pair of surfaces to receive for connection to each of said lower surfaces a horizontal partition member associated with a corresponding adjacent compartment, whereby both the upper and lower horizontal partition members associated with said adjacent compartments are supported at horizontal angular spacings and elevation spacings corresponding to the pitch of said spiral path and the angular portion thereof occupied by said compartments.

14. A building structure as claimed in claim 1, wherein said second portion of said L-shaped wall member is a radially disposed member.

15. A building structure as claimed in claim 1, wherein said first portion of said generally L-shaped wall member substantially defines a portion of a cylindrical surface concentric with the axis of said spiral.

References Cited UNITED STATES PATENTS 2,698,973 1/1955 Zeckendorf et al. 52-236 X 3,105,999 10/1963 Piazolo 52l76 3,290,837 12/1966 Weston 5230 3,307,307 3/ 1967 Wittenmyer et al. 52252 X 3,358,407 12/1967 Konig 52236 X HENRY C. SUTHERLAND, Primary Examiner U.S. Cl. X.R.

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