IL47005A - Arcuate structure for covering large areas - Google Patents

Description

ft The present invention is related to an arcuate or convex structure for covering large areas such for sports industrial and the More the structure of the present invention has a hemispherical configuration comprising two equal groups of arcuate members anchored at their extremities and combined in such a manner as to rationally support the weight of the the external loads and as well as any additional force due to point load of the The arcuate or convex structure of the present briefly comprises a first group of arcuate support members having various but equal radius of these member s being positioned in radial planes all intersecting one straight line that passes through the center of a sphere of radius equal to the radius of the arcuate The structure further comprises a second group of arcuate girding members which are positioned also in radial planes intersecting one straight line that passes through the center of the sphere with a radius equal to that of the arcuate or convex but at with respect to the intersecting line of the first group of The second group of which are arcuately girding the fir st 2 group are superpositioned and fixed are in tension at their respective extremities so as to cause a compressive load upon the first group of support A more detailed description of the invention will become evident from the in connection with the accompanying in Figure 1 is an artistic representation of the structure of the invention from the outside Figure 2 is a sectional view of the structure in a vertical Figures 3 and 4 are illustrations of the member s of the first and second groups in accordance with their respective Figure 5 is a plan view of the overall Figures 6 and 7 show partially the anchoring of the extremity of a member of the fir st group and of a member of the second Figure 8 shows schematically a variant of the overall and Figure 9 shows the group of the radial arcuate members which assist in the formation of the structure of figure 8 together with the two groups of member s of figure The structure of the invention comprises a first group of arcuate member s 1 of different lengths but of equal radius 1 These 1 are therefore arcs equal 2 and are positioned in radial planes P figure 3 that are all intersecting in a straight line k passing through the center of a sphere of corresponding to the radius of the 6 The structure further a second group of arcuate 2 having characteristics similar to the 8 numbers of the first These second group 9 are also positioned in radial planes e that 10 all intersecting in a straight line passing 11 center R of However this latter straight 12 line is rotated on the same horizontal with to the straight line in which the planes P are The extremities each arc member 1 of first group of members are to the base ring o steel or 16 forced said base ring resting on a surface may 17 be suitably flat figure T e extremities the arc 18 members 2 the second are similarly to a base 19 by means of suitable adjustable fasteners 20 to to the arc a traction force 21 the arc 1 a s 1 and 2 of two are made of circular or or polygonal The 2 o t second group are posed on those the group are 6 thereto by means such veld in or the e capable oP 27 ing the desired degree rigidity and stability the structure is made of a group of arcuate members 1 in compression member and another group 2 in tension the two group lying in different and mutually intersecting The hollow thus may be advantageously completed by means of a filling of concrete so as to increase the rigidity of the and by means of a surface covering 5 made of for a sheet metal a layer of insulating material and a layer of tar or asphalt see figure The arcuate members 1 and which together form the structur are suitably dimensioned so as to not only compre ssive but and other force because of the unique assembly described the girding members 2 in nullify completely in the supporting members 1 are in all other forces and leaving the supporting members subject only to by suitably adjusting the traction in the girding member s the supporting members 1 are loaded as if they had to bear the outer load due to wind and In other the girding members 2 imparts in members 1 stresses equal to if not greater than those due to accidental outer loading and of the weight of the structure The entire group 1 will thus be in while the entire group 2 will be in 1 additional loads occur externally 2 the members 1 should be under compression or under induced stress because t ere a compression this does not actually take place because to a increase in external load there should correspond a shortening of the 6 ing in agreement with the theory of 7 Th while to the same 8 the 2 be applied the equation Of P the l s the length of the A is the 10 sectional area thereof and S is modulus of 11 has obviously the same the same v 12 material of construction is used in both member developing the above analytical can be deduced that applying a preventive traction to griding members 2 15 to one t e total predetermined external load example 1 100 the members 2 lose the traction 17 while the ve s o 1 remains This is to say upon t e occurrence o an extra 19 external the traction variations a 20 maximum value V to zero only in 2 the 21 compression stress variations in t members 1 remain metallic hollow structure with as antageousl reduces by one 25 quantity and the cost the metal 26 concrete is capable about h o 27 compressive load existing in the a metal or metal when to analogous but conventional structures wherein all types Of stresses and loads are will weight equal light or about the weight the conventional structure of and about the weight of a conventional reinforced concrete The advantageous results can be achieved when the structure a group o supporting members 1 and a group steel cables girding the supporting In other it possible to build the structure of the invention by means of supporting steel arc members made of hollow tubular elements and metallic ropes or cables which serve as the it can be seen t at there are reductions in materials in also because the assembly of the structural members on ground is considerably more Because the weight of the the size the arcuate dome may be increased up to several jj hundred is practically impossible when using conventional reinforced and very questionable when metal ii The or nd which rests the structure have c polygonal t e w so as to form e convex arcuate dome be ered till it coincides with the center the so as to have a base ring to which are fixed the the grouos is subject to a stress or t e components of view on Cartesian have a sinussoidal curve placing the Y axis on the diameter of the longer arc In those regions where the stress rises the hold is assured by the weight of ring it is deemed ballasting of the be the Conversely the hold against the horizontal components the stresses caused 1 and 2 will be entrusted to the Because o the great lightness of the it is also possible to the entire upon rails or so as to obtain a given alternatively covered and According to a variant of the and without changing the scope the structure a group of supporting members all equal to one another and placed radially as to at the in the a first group girding members placed on the planes which are converging and intersecting in a horizontal and a members on planes which are in another horizontal vhich is at with respect to the groups of girding are composed of the structure s o in insufficientOCRQuality

Claims (7)

47005 /2

1. WHAT IS CLAIMED IS: *~ L Arcuate structure for covering stadia and the like, which comprises: a fir st group of supporting members positioned in radial planes intersecting all in a single fir st, horizontal straight line passing through the center of a sphere of radius equal to the radius of said struct structure; a second group of girding member s positioned in radial planes intersecting all in single, second horizontal, straight line passing thr gh the center of said sphere, said second line being at 90° with respect to said first line; said girding members being superposed and fixed to said supporting member s; each of said supporting and girding members being anchored at its extremities to a base ring securely engaged in the ground.

2. The structure according to claim 1, wherein said girding members are so anchored as to be in tension and as to convey onto said supporting members a compressive force, said girding members having the extremities thereof statically anchored to said base rings.

3. The structure according to claim 1, wherein each of said supporting and girding members has the said radius of curvature, and wherein said supporting members are made of metallic hollow tubular and said girding members are made of metallic material selected from hollow tubes and metallic cables.

4. The structure according to claim 1, wherein all of said members have varied length, starting from the central members toward the end members of the structure.'

5. The structure according to claim 1, wherein at least some of said member s are hollow metallic members filled with concrete and wherein the outer surface of said structure is covered by a protective covering. 47005/2

6. The structure according to claim 1, wherein said supporting members have equal length and equal radius of curvature and are so planed that they all inter sect at the top of the structure and at the center thereof, and wherein said girding member s have unequal length and equal radius of curvature and are so placed that they are convergent to one another and inter secting one another; said supporting member s being in compression and said girding members being in tension; all .id member s being anchored to said base ring.

7. The structure according to claim 1, wherein all said member s are anchor sed to said base ring by means of adjustable fastener s which suitably adjust the distance between said extremities to said ring in corre spondence of the variations in stresses existong in said member s.