CA2222940A1 - Prefabricated concrete panel - Google Patents
Prefabricated concrete panel Download PDFInfo
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- CA2222940A1 CA2222940A1 CA 2222940 CA2222940A CA2222940A1 CA 2222940 A1 CA2222940 A1 CA 2222940A1 CA 2222940 CA2222940 CA 2222940 CA 2222940 A CA2222940 A CA 2222940A CA 2222940 A1 CA2222940 A1 CA 2222940A1
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- Prior art keywords
- slab
- web
- extending
- panel
- concrete panel
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Panels For Use In Building Construction (AREA)
Abstract
A precast concrete panel comprising a slab which has at least one web extending downwardly from a lower surface, the web being spaced inwardly of the ends of the slab to thereby provide a web free edge portion. The slab includes both tension and compression bars extending through the stab. The concrete panel, due to its web free end portions, can be used to have a reduced floor height in a multi-floor structure.
Description
Feb.l1 '98 10:51 CA 02222940 1998-02A2 P. 2 PIhEFABR1CATLU CONCRETE PANEL
BACKGROUND OF THE tNVENT1UN
The present invention relates to the fteid of construction and more particularly, relates to precast wncrete panels.
'fhe use of precast concrete panels as a component in a building structure is well known in the art. Such precast panels are commonly used as components for floors, walls, roofs, etc.
The use of profabricetted or precast compo~nts in the erecti on of a but f ding structure is desirable for many different reasons. Thus, the conventional method of wnstructing concrete floors is relatively lengthy and expensive. Furthermore) variables such as temperature and material quality are sometimes difficult to control. The use of prefabricated components considerably aids the planning process as factors such as weather and the like do not need to be taken into aecount~ For this reason, it is particularly considered advantageous in climates wherein weather is such that wrtstruction could not proceed during certaizr parts of the year.
As aforementioned, such prefabrie;ated panels are known in the arl. There is, however, always a need to provide prefabricated concrete panels which offer desirable structural characteristics including as low a weight as possible for a given strength. It is also desin;ble to have a prefabricated concrete panel which can servo as a floor slab wherein the thickness at the supparied edges is minimized to thereby allow a greater control aver the height of each level of the building.
It is therefore an object of the present invention to provide a prefabricated concrete panel having a high strength to weight ratio.
Feb.l1 '9B 10:52 CA 02222940 1998-02-12 P. 3 Tt is a fiuther object of the present invention to provide a prefabricated concrete panel which can be used in various building structures while maintaining the thickness of the panel at its edges to a minimum.
1t is a further object of the present invention to provide a building structure using prefabricated concneie panels.
According w one aspec,-t of the present invention, there is provided a precast concrete panel compnsmg a slab having first aad second opposed ends and first and second opposed sides, an upper surface and a Lower surface, at least one web extending downwardly from the lower surface, a tension bar extending from the first end to the other end of the slab, the tension bar having a central portion extending downwardly into the web, at least one compression bar extending through the slab from the one end to the other end, the compression bar and the tension bar being secured together at their respective ends, and reinforcing means within the concrete slab.
According t« a further aspect of the preserrt invention, there is provided a precast concrete panel comprising a rectangular slab having firs! and second opposed ends and first and second opposed sides, an upper surlace and a lower surface, first and second webs extending downwardly from the lower surface, the first and second webs being general ly parallel to the first and second opposed sides, and a plurality of tension bars extending from the first end to the other end of the slab) each of the tension bars having a central portion extending downwardly into at least one of the webs, a plurality of compression bars extending through the slab from the one end to the other end, oath of the webs terminating inwardly from the first and second opposed ends to thereby provide a web free edge portion extending atvng the first and second opposed ends, and reinforcing means within the concrete slab.
BACKGROUND OF THE tNVENT1UN
The present invention relates to the fteid of construction and more particularly, relates to precast wncrete panels.
'fhe use of precast concrete panels as a component in a building structure is well known in the art. Such precast panels are commonly used as components for floors, walls, roofs, etc.
The use of profabricetted or precast compo~nts in the erecti on of a but f ding structure is desirable for many different reasons. Thus, the conventional method of wnstructing concrete floors is relatively lengthy and expensive. Furthermore) variables such as temperature and material quality are sometimes difficult to control. The use of prefabricated components considerably aids the planning process as factors such as weather and the like do not need to be taken into aecount~ For this reason, it is particularly considered advantageous in climates wherein weather is such that wrtstruction could not proceed during certaizr parts of the year.
As aforementioned, such prefabrie;ated panels are known in the arl. There is, however, always a need to provide prefabricated concrete panels which offer desirable structural characteristics including as low a weight as possible for a given strength. It is also desin;ble to have a prefabricated concrete panel which can servo as a floor slab wherein the thickness at the supparied edges is minimized to thereby allow a greater control aver the height of each level of the building.
It is therefore an object of the present invention to provide a prefabricated concrete panel having a high strength to weight ratio.
Feb.l1 '9B 10:52 CA 02222940 1998-02-12 P. 3 Tt is a fiuther object of the present invention to provide a prefabricated concrete panel which can be used in various building structures while maintaining the thickness of the panel at its edges to a minimum.
1t is a further object of the present invention to provide a building structure using prefabricated concneie panels.
According w one aspec,-t of the present invention, there is provided a precast concrete panel compnsmg a slab having first aad second opposed ends and first and second opposed sides, an upper surface and a Lower surface, at least one web extending downwardly from the lower surface, a tension bar extending from the first end to the other end of the slab, the tension bar having a central portion extending downwardly into the web, at least one compression bar extending through the slab from the one end to the other end, the compression bar and the tension bar being secured together at their respective ends, and reinforcing means within the concrete slab.
According t« a further aspect of the preserrt invention, there is provided a precast concrete panel comprising a rectangular slab having firs! and second opposed ends and first and second opposed sides, an upper surlace and a lower surface, first and second webs extending downwardly from the lower surface, the first and second webs being general ly parallel to the first and second opposed sides, and a plurality of tension bars extending from the first end to the other end of the slab) each of the tension bars having a central portion extending downwardly into at least one of the webs, a plurality of compression bars extending through the slab from the one end to the other end, oath of the webs terminating inwardly from the first and second opposed ends to thereby provide a web free edge portion extending atvng the first and second opposed ends, and reinforcing means within the concrete slab.
Feb.l1 '9B 10:53 CA 02222940 1998-02-12 P. 4 The prefabricated concrete panel ac;c;vrding to the present invention is generally designed to be used as a floor slab in any suitable structure. In particular, the prefabricated concrete panel can be used in such structures as parking garages as well as in residential and commerc,-iallindustrial construction.
The prefabricated concrete panels according to the present inventian may have various dillerent sties and conhguratfons with a conventional confil,~uation being a rectangular one. The prefabricated panels may be formed in various different lengths and widths with a typical length being in the order of 7 - 8 meters and a typical width being in the order of 2 -3 meters. Naturally, other dimensions may be employed.
The prefabricated concrete panel of the present invention uses at least one web and preferably at least a pair of webs which extend downwardly ftvm a bottom surface of the panel and which are designed w provide the desired structural reinforcing characteristics to the panel.
In a preferred ernbudiment of the present invention, the web or webs do not extend the full lenbrth of the panel. Rather, for a substantial portion of the length of the pre .fabricated concrete panel, the web or webs have a substantially constant height) However, as the webs approach the panel mils, they extend upwardly to merge with the bottom surface preferably at an angle of between 30 and 60 degrees and even more pr~eterably at an angle of about 45 degrees. The webs than terminate shart ofthe ends of the panel. This structure is advantageous since the ends of the panel are then free to rest on suitable supports such as steel I-beams with only the minimal thickness at the panel ends. In other words, by utilizing such an arrangement, the panel can reduce the height of the floor by up to half a meter.
Fn order to provide the desired structural characteristics, the reinforced concrete panel utilizes both tension rods and compression rods.
Feb.l1 '98 10:53 CA 02222940 1998-02-12 P. 5 'fhe compression rods preferably run substantially from one end of the panel to the other in a generally straight line.
The tension rods also r~ from one end to the other end of the panel, but are designed w substantially follow the form of the web. Thus, each tension rod would extend from a first end ofihe panel and then would extend downwardly to follow the general contour of the web before terminating at the other and of the panel.
The tension rods and compression rods are preferably secured together at the panel ends. A convenient way o1'securing the tension rods and compression rods together comprises the use of angle irons located at the ends of the prefabricated concrete panel. The angle items may then also be used for securing the panel to the steel support structure by welding.
As is well known in the ari, reinfure;ing means within the concrete slab may be utilize, such reinfun;ing means including tabors or a wire mesh.
The reinforcing wire mesh may also be employed within the web or webs. Again, the use of such reinforcing meshes is known in the art and such meshes are readily available un the commercial market.
In a preferred aspect of the present invention, at least a pair of such wire meshes are employed. An upper mesh acts in a conventional manner while a lower mesh is provided and which lower mesh extends downwardly into the webs - i.e. they would have a U-shaped cross sectional wnfiguration substantially identical to that of the webs.
Preferably, the tension burs would be placed within the U-shaped portion of the wire mesh.
Vlihen employed, the lower mesh would also have reinforcing bars extending at the point where the mesh extends downwardly into the webs. Such reinforc,-ing bars would normally act in compression. When the web is lifted, these reinforcing bars then function as tension bars.
Feb.l1 '98 10:54 CA 02222940 1998-02-12 P. 6 According to the present invention, there may be provided means associated with the prefabricated concrete panel for lifting the same. To this end, there may be provided a pl urality of bars extending from above the top surface of the slab downwardly and looped around the tensioning bars in the bottom of the web or webs. Preferably, the lifting members are themselves formed as a loop at the top for convenience i» lifting. Once in place, the lifting bars may be cut.
In a further aspect of the present invention) there is provided an improved parkin6 garage utilizing the prefabricated and prestressed concrete slabs or panels.
1n a conventional arrangement, such concrete slabs usually- span the ful l width of a parking concourse {approximately 2d meters) and main bCams are parallel w the circulation lane.
Tn the present design, the main supporting beams are perpendicular to the circulation lane and the prelabricaoed concrete slabs are parallel to the circulation lane. This penhits one to reduce the span of the slab and thus lower the cost-BRIEF DESCRIPTION OF'fHE DRAWINGS
Having thus generally described the invention, reference will be made to the accompanying drawings illustrating an embodiment thereof, in which:
Figure 1 is a perspec,-tive view of a precast wncrete panel according to the present invention;
Figure 2 is a side elevational view thereof with the precast cpncrete panel being supported on a pair of beams;
Figure 3 is a cross sectional view taken along the line 3-3 of Figure 2;
Figure 4 is a detail view of one end of the precasrt concrete panel of Figure 2; and figure 5 is an end view of a portion of the precast concrete panel illustrating the use of angle irons for attaching the reinforcing bars; and Fibre 6 is a set,~titmai view showing a lifting member.
Feb.l1 '98 10:55 CA 02222940 1998-02-12 P. 7 Referring to the drawings in greater detail and by reference characters thereto) there is illustrated in Figure 1 a precast concrete panel which is generally designated by reference numeral 10.
Precast cornrete panel 10 includes a first end 12) a second opposed end 14, a first side 16, and a sewnd side 18. The configuration is that of a rectangular slab which has an upper surface 20 and a lower surfac-x 22.
Extending downwardly from lower surface 22 are a pair of downwardly depending webs 24 and 26. As each web is substantially identical) only one will be described herein.
As may he seen in Figures 2 and 3, downwardly extending web 24 has) in transverse cross sectional view, a pair of web side walls z8 and 30 which are angled inwardly slightly and meet at a web bottom wall 32. fhe web 24 thus has a somewhat IJ-shaped cross sectional configuration_ As may be seen in Figures 1 and 2, downwardly extending web 24 has an end wall which is angled so as to extend from lower surface 22 to web bottom wall 32.
It wi l l he noted that web end wail 33 meets lower surface 22 at a point spaced inwardly from first end 12 to thereby provide an edge portion 35. A similar configuration exists at the other end of downwardly depending web 24_ 'turning to rigure 3, it will be seen that concrete panel 10 includes a plurality oi' compression bats 34 which generally extend from first end 12 to second end 14.
A plurality of tension bars 3b also are provided within concrete panel 10;
each tension bar 36 extends from first end t 2 to second end 14; however it wi 11 be seen that each tension bar 36 has, adjacent to first end 12, an upper horizontal portion 38 and a downwardly angled portion 40 and a lower horizontal portion 42. 1n other words, each tension bar 36 follows the general outline or configuration of downwardly depending webs 24 and 26, Feb.l1 '98 10:55 CA 02222940 1998-02-12 P. B
I
Concrete panel 10 also includes an upper reinforcing mesh 44 and a lower reinforcing mesh 46. in this respect, attd as may be best seen in rigure 3, lower reinforcing mesh 46 includes horizontal portions 48 and U-shaped portions 50 and 52. il-shaped portions SU
and ~2 fUlIUW the configuration of downwardIy depending webs 24 and 26 respectively. It will be noted that tension bars 36 are within U-shaped portions SQ and 52.
In the illustrated embatiment, there are also provided reinforcing bars 54 extending;
from first end 12 to second end 14 and are adjacent or slightly below lower mesh 46 at the points where lower mesh 46 makes the transition from horizontal portion 48 to U-shaped portions 50 and 52. Reinforcing bars S4 normally act in compression; however, when the panel is lilted, they function as tension bars.
Turning to figures 4 and S, it will be seen that at fi~-t end 12) there is provided a firs!
angle iron 58 ht~ving a vertical portion 60 and a horizontal portion 62. A
second angle iron fi4 also has a vertical portion 66 and a horizontal portion 68.
Horizontal portions 62 and 68 are positioned at the lower surface 22 of concrete panel 10) Mgle irons 58 and 64 function as a means of securing compression bars 34 and tension bars 36 together. Thus, as may be seen, a tension bar 36 is positioned between vertical portions 60 and 66 and which tension bar may then be secured by weldins. A pair of compression bars 34 ate located at the inner angle of each of angle irons 58 and 64 and welded thereto.
As seen in Figure 4, the arrangement of concrete panel 10 with downwardly depending web 24 and edge portion 35 is such that edge portion 35 may sit on the upper flange 72 of an 1-beam 74. In turn) the bottom surface of horizontal portions 62 and 68 of ankle irons 58 and 64 respectively may be welded to the top surface of upper riange 72.
For purposes of lining precast concrete panel 10 into a desired position, the panel may include » plurality of lifting members, one of which is illustnrted in Figure 6 and generally Feb.l1 '9B 10:56 CA 02222940 1998-02-12 p, g designated by reference numeral 80. Lifting member 80 is formed as a loop with a bottrnn Icnap portion 82 thereof extendinb around one or more tension bars 36 a~ with a clr~sed loop upper portion 84 of lifting member 80 extending above upper surface 20.
It will be understood that the above described embodiments are for purposes of iiluslration only and that changes and modifications may be made thereto without departing from the spirit end scope of the invention.
The prefabricated concrete panels according to the present inventian may have various dillerent sties and conhguratfons with a conventional confil,~uation being a rectangular one. The prefabricated panels may be formed in various different lengths and widths with a typical length being in the order of 7 - 8 meters and a typical width being in the order of 2 -3 meters. Naturally, other dimensions may be employed.
The prefabricated concrete panel of the present invention uses at least one web and preferably at least a pair of webs which extend downwardly ftvm a bottom surface of the panel and which are designed w provide the desired structural reinforcing characteristics to the panel.
In a preferred ernbudiment of the present invention, the web or webs do not extend the full lenbrth of the panel. Rather, for a substantial portion of the length of the pre .fabricated concrete panel, the web or webs have a substantially constant height) However, as the webs approach the panel mils, they extend upwardly to merge with the bottom surface preferably at an angle of between 30 and 60 degrees and even more pr~eterably at an angle of about 45 degrees. The webs than terminate shart ofthe ends of the panel. This structure is advantageous since the ends of the panel are then free to rest on suitable supports such as steel I-beams with only the minimal thickness at the panel ends. In other words, by utilizing such an arrangement, the panel can reduce the height of the floor by up to half a meter.
Fn order to provide the desired structural characteristics, the reinforced concrete panel utilizes both tension rods and compression rods.
Feb.l1 '98 10:53 CA 02222940 1998-02-12 P. 5 'fhe compression rods preferably run substantially from one end of the panel to the other in a generally straight line.
The tension rods also r~ from one end to the other end of the panel, but are designed w substantially follow the form of the web. Thus, each tension rod would extend from a first end ofihe panel and then would extend downwardly to follow the general contour of the web before terminating at the other and of the panel.
The tension rods and compression rods are preferably secured together at the panel ends. A convenient way o1'securing the tension rods and compression rods together comprises the use of angle irons located at the ends of the prefabricated concrete panel. The angle items may then also be used for securing the panel to the steel support structure by welding.
As is well known in the ari, reinfure;ing means within the concrete slab may be utilize, such reinfun;ing means including tabors or a wire mesh.
The reinforcing wire mesh may also be employed within the web or webs. Again, the use of such reinforcing meshes is known in the art and such meshes are readily available un the commercial market.
In a preferred aspect of the present invention, at least a pair of such wire meshes are employed. An upper mesh acts in a conventional manner while a lower mesh is provided and which lower mesh extends downwardly into the webs - i.e. they would have a U-shaped cross sectional wnfiguration substantially identical to that of the webs.
Preferably, the tension burs would be placed within the U-shaped portion of the wire mesh.
Vlihen employed, the lower mesh would also have reinforcing bars extending at the point where the mesh extends downwardly into the webs. Such reinforc,-ing bars would normally act in compression. When the web is lifted, these reinforcing bars then function as tension bars.
Feb.l1 '98 10:54 CA 02222940 1998-02-12 P. 6 According to the present invention, there may be provided means associated with the prefabricated concrete panel for lifting the same. To this end, there may be provided a pl urality of bars extending from above the top surface of the slab downwardly and looped around the tensioning bars in the bottom of the web or webs. Preferably, the lifting members are themselves formed as a loop at the top for convenience i» lifting. Once in place, the lifting bars may be cut.
In a further aspect of the present invention) there is provided an improved parkin6 garage utilizing the prefabricated and prestressed concrete slabs or panels.
1n a conventional arrangement, such concrete slabs usually- span the ful l width of a parking concourse {approximately 2d meters) and main bCams are parallel w the circulation lane.
Tn the present design, the main supporting beams are perpendicular to the circulation lane and the prelabricaoed concrete slabs are parallel to the circulation lane. This penhits one to reduce the span of the slab and thus lower the cost-BRIEF DESCRIPTION OF'fHE DRAWINGS
Having thus generally described the invention, reference will be made to the accompanying drawings illustrating an embodiment thereof, in which:
Figure 1 is a perspec,-tive view of a precast wncrete panel according to the present invention;
Figure 2 is a side elevational view thereof with the precast cpncrete panel being supported on a pair of beams;
Figure 3 is a cross sectional view taken along the line 3-3 of Figure 2;
Figure 4 is a detail view of one end of the precasrt concrete panel of Figure 2; and figure 5 is an end view of a portion of the precast concrete panel illustrating the use of angle irons for attaching the reinforcing bars; and Fibre 6 is a set,~titmai view showing a lifting member.
Feb.l1 '98 10:55 CA 02222940 1998-02-12 P. 7 Referring to the drawings in greater detail and by reference characters thereto) there is illustrated in Figure 1 a precast concrete panel which is generally designated by reference numeral 10.
Precast cornrete panel 10 includes a first end 12) a second opposed end 14, a first side 16, and a sewnd side 18. The configuration is that of a rectangular slab which has an upper surface 20 and a lower surfac-x 22.
Extending downwardly from lower surface 22 are a pair of downwardly depending webs 24 and 26. As each web is substantially identical) only one will be described herein.
As may he seen in Figures 2 and 3, downwardly extending web 24 has) in transverse cross sectional view, a pair of web side walls z8 and 30 which are angled inwardly slightly and meet at a web bottom wall 32. fhe web 24 thus has a somewhat IJ-shaped cross sectional configuration_ As may be seen in Figures 1 and 2, downwardly extending web 24 has an end wall which is angled so as to extend from lower surface 22 to web bottom wall 32.
It wi l l he noted that web end wail 33 meets lower surface 22 at a point spaced inwardly from first end 12 to thereby provide an edge portion 35. A similar configuration exists at the other end of downwardly depending web 24_ 'turning to rigure 3, it will be seen that concrete panel 10 includes a plurality oi' compression bats 34 which generally extend from first end 12 to second end 14.
A plurality of tension bars 3b also are provided within concrete panel 10;
each tension bar 36 extends from first end t 2 to second end 14; however it wi 11 be seen that each tension bar 36 has, adjacent to first end 12, an upper horizontal portion 38 and a downwardly angled portion 40 and a lower horizontal portion 42. 1n other words, each tension bar 36 follows the general outline or configuration of downwardly depending webs 24 and 26, Feb.l1 '98 10:55 CA 02222940 1998-02-12 P. B
I
Concrete panel 10 also includes an upper reinforcing mesh 44 and a lower reinforcing mesh 46. in this respect, attd as may be best seen in rigure 3, lower reinforcing mesh 46 includes horizontal portions 48 and U-shaped portions 50 and 52. il-shaped portions SU
and ~2 fUlIUW the configuration of downwardIy depending webs 24 and 26 respectively. It will be noted that tension bars 36 are within U-shaped portions SQ and 52.
In the illustrated embatiment, there are also provided reinforcing bars 54 extending;
from first end 12 to second end 14 and are adjacent or slightly below lower mesh 46 at the points where lower mesh 46 makes the transition from horizontal portion 48 to U-shaped portions 50 and 52. Reinforcing bars S4 normally act in compression; however, when the panel is lilted, they function as tension bars.
Turning to figures 4 and S, it will be seen that at fi~-t end 12) there is provided a firs!
angle iron 58 ht~ving a vertical portion 60 and a horizontal portion 62. A
second angle iron fi4 also has a vertical portion 66 and a horizontal portion 68.
Horizontal portions 62 and 68 are positioned at the lower surface 22 of concrete panel 10) Mgle irons 58 and 64 function as a means of securing compression bars 34 and tension bars 36 together. Thus, as may be seen, a tension bar 36 is positioned between vertical portions 60 and 66 and which tension bar may then be secured by weldins. A pair of compression bars 34 ate located at the inner angle of each of angle irons 58 and 64 and welded thereto.
As seen in Figure 4, the arrangement of concrete panel 10 with downwardly depending web 24 and edge portion 35 is such that edge portion 35 may sit on the upper flange 72 of an 1-beam 74. In turn) the bottom surface of horizontal portions 62 and 68 of ankle irons 58 and 64 respectively may be welded to the top surface of upper riange 72.
For purposes of lining precast concrete panel 10 into a desired position, the panel may include » plurality of lifting members, one of which is illustnrted in Figure 6 and generally Feb.l1 '9B 10:56 CA 02222940 1998-02-12 p, g designated by reference numeral 80. Lifting member 80 is formed as a loop with a bottrnn Icnap portion 82 thereof extendinb around one or more tension bars 36 a~ with a clr~sed loop upper portion 84 of lifting member 80 extending above upper surface 20.
It will be understood that the above described embodiments are for purposes of iiluslration only and that changes and modifications may be made thereto without departing from the spirit end scope of the invention.
Claims (16)
1. A precast concrete panel comprising a slab having first and second opposed ends and first and second opposed sides, an upper surface and a lower surface, at least one web extending downwardly from said lower surface, a tension bar extending from said first end to said other end of said slab, said tension bar having a central portion extending downwardly into said web, at least one compression bar extending through said slab from said one end to said other end, said compression bar and said tension bar being secured together at their respective ends, and reinforcing means within said concrete slab.
2. The precast concrete panel of Claim 1 wherein said panel has first and second parallel webs each extending downwardly from said lower surface.
3. The precast concrete panel of Claim 2 wherein each of said webs terminates inwardly from said first and second opposed ends to thereby provide edge portions along said first and second opposed ends.
4. The precast concrete panel of Claim 1 wherein said web has a pair of inwardly angled web side walls extending downwardly from said lower surface, said inwardly angled side walls terminating in a web bottom wall, and web end walls extending from said lower surface to said web bottom wall, said web end walls extending downwardly and inwardly at an angle of between 30 degrees and 60 degrees with respect to said lower surface.
5. The precast concrete panel of Claim 1 wherein a plurality of tension bars extend through said slab between said first and second opposed ends, each of said tension bars having a central portion thereof extending into said web proximate a bottom of said web.
6. The precast concrete panel of Claim 1 wherein said reinforcing means within said concrete slab comprises a first reinforcing mesh extending through said slab.
7. The precast concrete panel of Claim 6 further including a second reinforcing mesh, said second reinforcing mesh extending between said first and second opposed sides, said second reinforcing mesh being situated below said first reinforcing mesh and having a portion thereof extending downwardly within said web to a position below said tension bar.
8. The precast concrete panel of Claim 7 further including a plurality of rebars extending in a longitudinal direction adjacent said second reinforcing mesh, at least one of said rebars being located at a paint where said reinforcing mesh extends downwardly into said web.
9. The precast concrete panel of Claim 1 further including angle irons within said slab at each of said first and second ends of said panel, said tension bar and said compression bar being secured to said angle iron, said angle iron having a surface located at a lower surface of said slab to provide a means of securing said panel to a supporting beam.
10. The precast concrete panel of Claim 9 wherein said angle irons have vertical portions in a spaced relationship, said tension bear being welded to each of said vertical portions.
11. The precast concrete panel of Claim 4 wherein said web end wall forms an angle of between 30 and 60 degrees with respect to horizontal planes extending along said lower surface of said slab and said web bottom wall.
12. The precast concrete panel of Claim 1 further including at least one lifting member, said lifting member forming a lower loop portion extending below said tension bar and an upper loop portion extending above said upper surface of said slab.
13. A precast concrete panel comprising a rectangular slab having first and second opposed ends and first and second opposed sides, an upper surface and a lower surface, first and second webs extending downwardly from said lower surface, said first and second webs being generally parallel to said first and second opposed sides, and a plurality of tension bars extending from said first end to said other end of said slab, each of said tension bars having a central portion extending downwardly into at least one of said webs, a plurality of compression bars extending through said slab from said one end to said other end, each of said webs terminating inwardly from said first and second opposed ends to thereby provide a web free edge portion extending along said first and second opposed ends, and reinforcing means within said concrete slab.
14. The precast concrete panel of Claim 13 wherein said reinforcing means within said concrete slab comprises a first reinforcing mesh extending through said slab.
15. The precast concrete panel of Claim 13 further including angle irons within said slab at each of said first and second ends of said panel, said tension bar and said compression bar being secured to said angle iron, said angle iron having a surface located at a lower surface of said slab to provide a means of securing said panel to a supporting beam.
16. The precast concrete panel of Claim 13 wherein said panel further includes a plurality of lifting members, each lifting member forming a lower loop portion extending below said central portion of said tension bars and an upper loop portion extending above said upper surface of said slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2222940 CA2222940A1 (en) | 1998-02-12 | 1998-02-12 | Prefabricated concrete panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2222940 CA2222940A1 (en) | 1998-02-12 | 1998-02-12 | Prefabricated concrete panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2222940A1 true CA2222940A1 (en) | 1999-08-12 |
Family
ID=29275311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2222940 Abandoned CA2222940A1 (en) | 1998-02-12 | 1998-02-12 | Prefabricated concrete panel |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2222940A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008096102A1 (en) * | 2007-02-08 | 2008-08-14 | Peter Leighton Robson | A floor slab and apparatus for forming same |
| CN107642175A (en) * | 2017-08-21 | 2018-01-30 | 湖南诚友绿色建材科技有限公司 | A kind of Prefabricated Concrete groove profile cored slab for movable plank house |
-
1998
- 1998-02-12 CA CA 2222940 patent/CA2222940A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008096102A1 (en) * | 2007-02-08 | 2008-08-14 | Peter Leighton Robson | A floor slab and apparatus for forming same |
| CN107642175A (en) * | 2017-08-21 | 2018-01-30 | 湖南诚友绿色建材科技有限公司 | A kind of Prefabricated Concrete groove profile cored slab for movable plank house |
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