CA1095736A - Prestressed concrete tank - Google Patents
Prestressed concrete tankInfo
- Publication number
- CA1095736A CA1095736A CA308,405A CA308405A CA1095736A CA 1095736 A CA1095736 A CA 1095736A CA 308405 A CA308405 A CA 308405A CA 1095736 A CA1095736 A CA 1095736A
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- Canada
- Prior art keywords
- panels
- flange
- adjacent
- lip
- sheet metal
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship. The panels having on their outer faces a sheet of metal presenting parallel longitudinal undercut channels and a lateral flange extending parallel with the elongated sides of the panels and laterally outwardly therefrom. The sheet metal flange has a lip on the outermost edge which extends from the tank in a direction substantially perpendicular to the panel. The flange lips of adjacent panels are spaced from one another.
A sheet metal, channel shaped splice member is interposed in the space between the flange lips of adjacent panels, the splice member having upstanding sides which abut the flange lips of adjacent panels and the flange lip and the abutting upstanding side being seamed together in a tight fold, thereby locking adjacent precast concrete panels together with a watertight seam.
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship. The panels having on their outer faces a sheet of metal presenting parallel longitudinal undercut channels and a lateral flange extending parallel with the elongated sides of the panels and laterally outwardly therefrom. The sheet metal flange has a lip on the outermost edge which extends from the tank in a direction substantially perpendicular to the panel. The flange lips of adjacent panels are spaced from one another.
A sheet metal, channel shaped splice member is interposed in the space between the flange lips of adjacent panels, the splice member having upstanding sides which abut the flange lips of adjacent panels and the flange lip and the abutting upstanding side being seamed together in a tight fold, thereby locking adjacent precast concrete panels together with a watertight seam.
Description
( ( 3~192 ,.
g~73~
This invention camprises a concrete tank of improved s~ructure which i6 easy to assemble on-site from precast concrete units. More specifically, this invention relates to prestressed concrete tanks wherein the concrete core wall is comprised of elongated precast concrete panels having an outer facing of steel sheet. Even more specîficall~, this invention relates to a novel and economical method for connecting adjacent precast concrete panels to form an integrated assembly having reliable, water tight joints.
Concrete tanks have heretofore been erected from the ground up at the work site., This method of operation is inefficient beca~se work is subjected to de~ays due to weather unavailabilityof materials or labor, ~tc. Efforts have there-fore been made to bring to the work site, precast concrete units which can be fabricated at convenient times and places and typically indoors.
The precast panels typically include a sheet metal sheathing which is permanently bonded to one face of a precast concrete panel. The sheathing presents a plurality o~
parallel, longitudinal channels which form a site upon which mortar may be projected to form an outer coating or wall on the erected panels. Typically, these precast units are formed of hydraulic concrete deposited upon a sheet steel diaphragm in which the parallel, longitudinal channels have alread~y been formed, the panels being of a length in accordance with the height of the contemplated tank.
~ hile the advent of precast concrete panels has simplified the on-site erection of prestressed concrete tanks, ~k ` 37192 , ~9~73~i problems have been encountered in connecting and sealing the precast units to one another. U.S. Patent No. 3,280,525>
to Crowley suggests a technique for connecting and sealing precast panels to one another wherein a half channel is formed on both edges of each precast panel so that adjacent panels present one full channel which can be locked in place by the insertion of metal key plate having a cross section similar to that of the channels but just slightly smaller in size so as to fit snuggly when driven in place.
The primary object of this invention is to provide a simpler, more economical and more reliable method and pre-cast panel configuration so that precast concrete panels having channels may be more efficiently connected to one another in the erection of a precast concrete tank.
, It is also an object of this invention to avoid the expense of providing and handling separate cover plates as are used in U.S. P~tent No. 3,280,525.
It is also a very important object of this invention to reduce the number of seals in the joinery between the adjacent concrete panels so that the chance of leakage from within the tank is reduced and the amount o sealant and the work necessary to apply that sealant is also reduced.
These and other objects of this invention are achieved in a prestressed concrete tank having a core wall comprising elongated panels of precast concrete having on their outer faces, a sheet of sheet metal presenting parallel, longitudinal, undercut channels. The panels also include two lateral, sheet metal flanges which extend parallel with the elongated sides of the panels and laterally outwardly therefrom. The panels are assembled in spaced, side-by-side ( ~7192 ~9573~
relationship such that the sheet metal flanges on adjacent panels overlap one another. The overlapping flanges are then fastened to one another, preferably with sheet metal screws and an elastomeric compound is used to seal the join~. The advantages of the instant invention are ~ha~ the steel skin over the filler joints is part of the steel skin on the panels and a separate cover plate is not required. Moreover, when the concrete panels are erectedJ the joint cover is automatically in place except for sealing and this eliminates the problem of handling a separate cover plate. Also,there is only one joint line to seal with elastomeric compound versus two joint lines in the tank configuration of U.S. Patent No. 3,28Q,525 and thus the amo~nt of elastomeric material and labor that is required is reduced by about one half. The invention reduces the chance o~f leakage from the tank considerably.
The foregoing invention is highly satisfactory in eliminating expensive cover plates, reducing the joinery and reducing the likelihood of leakage. ~owever, it has now been found that by providing the sheet metal diaphragm with seamed joints set within the precast concrete, the resulting pre-stressed tank is even more reliable and satisfactory.
It is a further object of the present invention to provide an improved precast concrete panel which further reduces the likelihood of leakage from the tank.
It is a further object of the present invention t~
provide an improved means of securing the steel metal sheet to the precast concrete of the panel.
It is also an object of the present invention to provide an improved means for preventing the sheet metal diaphragim from peeling away from the precast concrete a~ the edge of each panel.
( ~7192 These and other objects of this invention are achieved in a panel, having on its outer surface a plurality of elongated sheets of sheet metal. At least one of the sheets of sheet metal has parallel longitudinal undercut channels and each sheet has at least one lip which extends from the interior side of the sheet metal sheet into the precast concrete. The lips of adjacent sheets are fastened together to form a joint in ~he precast concrete. The advantages of such a construction are that, in addition to the securing effect achieved by the undercut channels in the sheet metal, the joint is firmly anchored in the precast concrete thus securing the sheet metal to the precast concrete.
At the edge of the panel, the joint anchored in the precast concrete prevents the sheet metal rom peeling away from the precast concrete. This minimizes the tendency of the sheet metal diaphragm to peel away from the edge of the panel and thereby improves the joint between adjacent panels and minimizes leaks in the tanks at positions where adjacent panels are connected. At positions interior to the edge ~f the panels, the joint locks the sheets together and fixedly secures them to the precast concrete.
Furthermore, it has now been found that the above-mentioned seaming technique is not only useful in seaming metal sheets together in the formation of precast concrete panels but is also useful in seaming adjacent panels together thus producing a prestressed tank which is even more reliable and economical.
It is an object of the invention to eliminate the use of sealant in ioining the adjacent precast concrete panels together.
371g2 ~ 3~
It is also an object of the invention to allow formation of panels and tanks using a single seaming device thus reducing costs and complexity.
It is also an important object of this invention to create a tighter, more waterproof seam between adjacent panels thus reducing the chance of leakage from within the tank.
Likewise, it is an object of the invention to provide a reliable seam between adjacent panels which does not require the penetration of the sheet metal with sheet metal screws.
These and other objects of the invention are achieved in a prestressed concrete tank having a core wall comprising elongated panels of precast concrete having on their outer faces a sheet of sheet metal presenting parallel t .
longitudinal, undercut channels. The panels include lateral sheet metal flanges which extend parallel to the elongated sides o the panels and laterally outward therefro~. The flanges have a ~lange lip on the outermost edge o~ the flange.
The lip extends outwardly from the tank in a direction substantially perpendicular to the panel. The panels are assembled in spaced, side-by-side relationship such that the flange lips of adjacent panels are spaced from one another. A sheet metal splice member having a channel shape is interposed in the space between the flange lips oX ~he adiacent panels. The splice member has upstanding sides which abut the lips of the adjacent panels. The upstanding side and the flange lip adjacent to it are seamed together in a tight fold, thus locking the adjacent panels together.
The advantage of this technique is that it creates ~k9 ~7 3~
tighter, more wate~proof seam between adjacent panels without penetr~ting the sheet metal diaphragm with sheet metal screws or other fasteners. Furthermore, such a joint eliminates the use of sealants in joining adjacent paneIs.
More particularly, there i5 provided:
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on a face a sheet of sheet metal presenting parallel longitud-inal undercut channels and a lateral, sheet metal flange extend-ing parallel with the elongated sides of said panels and later-ally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent panels being spaced from one another; a sheet metal, channel shaped splice member interposed in said space between the flange lips of adjacent panels, said splice member having upstanding sides which abut the flange lips of adjacent panels and said flange lip and abutting upstanding side being seamed together in a tight fold, thereby locking adjacent precast concrete panels together with a watertight seam.
There is also provided:
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on a face a sheet of sheet metal presenting parallel longitudinal undercut channels and a lateral sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent paneIs being aligned adjacent to and abutting ~`9~73~
each other and said flange lips being seamed together in a tight fold thereby locking adjacent precast panels together in a water-tight seam.
There is also provided~
A method for forming prestressed concrete tanks com-prising the steps of aligning elongated precast concrete panels side by side, said concrete panels having a sheet metal flang~
which extends parallel with the elongated sides of the panels and laterally outwardly therefrom said sheet metal flange having a flange lip extending from said tank in a direction substantial-ly perpendicular to the panel and being adjacent to and abutting the flange lip of the adjacent panel; seaming the adjacent flange lip together in a tight fold; and depositing concrete in the space formed between the outwardly extending flanges and precast concrete of adjacent panels.
There is further provided:
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on its outer face a sheet of sheet metal presenting parallel longitudinal undercut channels and a lateral, sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends outwardly from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent panels being spaced from one another; a sheet metal, channel shaped splice member interposed in said space between the flange lips of adjacent panels, said splice member having upstanding sides which abut the flange lips of adjacent panels and said flange lip and abutting upstanding side being seamed together in a tight fold, thereby locking ad-jacent precast concrete panels together with a watertight seam.
- 7a -73t~
There is also provided;
A method of forming paneIs for use in prestressed concrete tanks comprising the steps of: laying a plurality of elongated metal sheets of steel in side-by-side relationship, each of said sheets having an interior and exterior side, at least one of said sheets having parallel longitudinal undercut channels and each sheet having a lip extending inwardly at each elongated edge thereof, the lips on adjacent sheets abutting one another; laying sheet metal flanges parallel to and adjacent the two elongated sides of the plurality of elongated metal sheets, each of said flanges having a lip extending inwardly and abut-ting a lip on the adjacent sheet of sheet metal; seaming the abutting lips of said sheets of sheet metal and sheets of sheet metal and flanges, respectively, in a continuous tight fold; and depositing concrete on the interior side of said sheet, the said continuous tight folds extending into the deposited concrete and serving to anchor the sheet metal sheets and flanges therein.
The invention is more fully described in the accompanying drawings, in which:
FIG. 1 is a cross sectional plan view of portions of the concrete tank of this invention showing the assembled panels;
and FIG. 2 is an elevation view along lines 2-2 of FIG l; and FIG. 3 is a further cross sectional plan view of a com-pleted tank according to the invention.
FIG. 4 is a cross sectional plan view of portions of the concrete tank of this invention showing the assembled panels and the seamed joints.
FIG. 5 is a cross sectional plan view of a pair of ad-jacent sheet metal sheets and the lips provided thereon prior to seaming.
FIG. 6 is a cross sectional plan view of a preferred - 7b -~q~ i73&;
embodiment of a pair of adjacent sheet metal sheets and the lips provided thereon prior to seaming.
FIG. 7 is a cross sectional plan view of a pair of ad-jacent sheet metal sheets showing a seamed joint according to the present invention.
FIG. 8 is a cross sectional plan view of a pair of ad-jacent sheet metal sheets showing a preferred seamed joint according to the present invention.
FIG. 9 is a cross sectional plan view of a portion of the concrete tank showing the splice member interposed between the flange lips of the adjacent panels prior to seaming.
FIG. 10 is a cross sectional plan view o a portion of the concrete tank showing the improved means for locking adjacent panels together.
In Figure 1, reference 10 refers generally to a concrete core wall formed from two precast concrete panels 12 and 14~ Each of panels 12 and 14 has an outer face of sheet metal 16 which presents a plurality of paralle~l>
longitudinal undercut channels 18. The steel sheet 16 on each of panels 12 and 14 extends past the edge of the panel to form a flange 20 on panel 12 and a flange 22 on panel 14.
These flanges extend parallel w,ith the vertical sides of panels 12 and 14 and extend laterally outwardly therefrom.
Panels 12 and 14 are separated by space 24.
With reference to Figure 2, flanges 20 and 22 on panels 12 and 14, respectively, overlap one another and are fastened to one another by means of sheet metal screws 26.
The joint is filled with an elastomeric material 28 and the entire joint between panels 12 and 14 is filled with filler concrete 30. The elastomeric materials which are used to seal the joint may be any of those known for this purpose including silicone rubbers, polysulfides and the like.
After the core wall is erected as described, an intermediate wall 32 of cement is ormed on the ~uter steel facing of the panels. Pneumatically proiected mortar is used to form an outer coating or wall which tightly seals in the parallel, lon~itudinal, undercut channels 18 in the sheet metal facing of the panels. After the intermediate wall 32 is formed the tank may be prestress~d by wires 34 ` 37192 ~1'`9~i736 and the wires are covered with a further cementitious covering 36.
Figure 4 is essentially the same as Figure 1 except that the seamed joints 11 have been added at interior portions of each panel and at the panel edges. Each panel 12 and 14 is made up of more than one metal sheet. The sheets 16a, 16c and 16e contain parallel, longitudinal undercut channels 18. The edge of panel 12 is provided with sheet 16b and the edge of panel 14 is provided with sheet 16d, neither of which have undercut channels. The lateral extensions of sheet 16b and 16d form flanges 20 and 22, respectively. The adjacent sides of sheet metal are provided with lips-which have been seamed together to form a joint 11, which is anchored in the precast concrete.
The joint may be formed by using the seaming . ..
machine disclosed and described in U.S. Patent No. 3,120,828.
More specifically, the machine presently being used to form the seams is the ~OOF RUNNEP~ machine which is available from the Butler Research Co., Kansas City, Mo. Referring to,Figures 4 and 5, the metal sheets 16a and 16c are provided with upstanding lips 15 and 17 which are in abutting side-by-side relationship. Likewise, in order to form the joint at the edge of the panel 12, the metal sheets 16a and 16b are provided with upstanding lips 15 and 17 arranged in abutting side-by-side relationship. Preferably the sheets to be joined by seaming are laid flat upon a ~or~ surface with the lips extending upwardly.
The seaming device is placed at one end of the upstanding lips 15 and 17 and the carriage is moved along the lips. A series of rolls and counterrolls cause lip 15 ~J`~i'736 to be folded over or together with and over lip 17 seaming the two adiacent sheets together into a folded joint 13 as shown in Figure 7. A second pass of the seaming machine causes the folded joint 13 tv be ~olded again into the joint 11 as shown in Figure ~. After the joint ll is formed the panel is completed by depositing hydraulic concrete upon the sheet metal. .The concrete covers the joint ll thereby locking the sheet into the concrete.
Referring to Figure 6, a preferred lip form is - shown. The preferred lip form includes a male lip 21 and female lip 19 which are prerolled by conventional methods.
The male lip 21 is formed by turning back the metal. The female lip 19 is turned over the male lip 21 to form an inverted V with an angle of approximately 30C. The advantage of this preferr~d lip form is that a single pass ..
of the seaming machine will result in the formation of the doubly folded joint shown in Figure 8.
Figures 9 and 10 are essentially the same as Figure 4 except that the improved method of joining the precast panels is illustrated.
Referring to Figures ~ and 10, the flanges 20 and 22 are provided with flan~e lips 23 and 29~ respectively, which extend outwardly from the tank in a direction substantially perpendicular to the panel. The panels 12 and 14 are erected such that there is a space between them. A
channel shaped splice member 16f is interposed in the space between the panels 12 and 14. The splice member 16f is sheet metal and has two upstanding sides 25 and 27. Side 25 abuts flange lip 23 and side 27 abuts flange 29. Using the ROOF RUNNERT machine in the same manner described above for ii736 the formation of joints 11, except that it is used to vertically seam the adjacent erected panels, tightly fol~d seams 31 are formed. The entire space hetween panels 12 and 14 is filled ~ith filler concrete 30.
Another embodiment of the invention comprises aligning panels 12 and 1~ so that flange lips 23 and 29 are side-by-side and abutting in a manner analogous to Figures 5 or 6 and forming a single seam to join the adjacent precast panels.
The majority of the time the placement of the sheet metal diaphragm is on the outside surface of the struct-lre.
However, there are times, pi-lmarily due to job site condition~;, exterior connections or inability to brace inwardl~, where the sheet rnetal diaphragm is placed on the inside surface of ~he stmcture. lhis is accommcdated by reversing the dircction of the curvature in the panel beds. All other aspects of the description re.main identical but, on the interic)r surface except for the horizontal prestressing which remains on the exterior of the structure.
~"V
g~73~
This invention camprises a concrete tank of improved s~ructure which i6 easy to assemble on-site from precast concrete units. More specifically, this invention relates to prestressed concrete tanks wherein the concrete core wall is comprised of elongated precast concrete panels having an outer facing of steel sheet. Even more specîficall~, this invention relates to a novel and economical method for connecting adjacent precast concrete panels to form an integrated assembly having reliable, water tight joints.
Concrete tanks have heretofore been erected from the ground up at the work site., This method of operation is inefficient beca~se work is subjected to de~ays due to weather unavailabilityof materials or labor, ~tc. Efforts have there-fore been made to bring to the work site, precast concrete units which can be fabricated at convenient times and places and typically indoors.
The precast panels typically include a sheet metal sheathing which is permanently bonded to one face of a precast concrete panel. The sheathing presents a plurality o~
parallel, longitudinal channels which form a site upon which mortar may be projected to form an outer coating or wall on the erected panels. Typically, these precast units are formed of hydraulic concrete deposited upon a sheet steel diaphragm in which the parallel, longitudinal channels have alread~y been formed, the panels being of a length in accordance with the height of the contemplated tank.
~ hile the advent of precast concrete panels has simplified the on-site erection of prestressed concrete tanks, ~k ` 37192 , ~9~73~i problems have been encountered in connecting and sealing the precast units to one another. U.S. Patent No. 3,280,525>
to Crowley suggests a technique for connecting and sealing precast panels to one another wherein a half channel is formed on both edges of each precast panel so that adjacent panels present one full channel which can be locked in place by the insertion of metal key plate having a cross section similar to that of the channels but just slightly smaller in size so as to fit snuggly when driven in place.
The primary object of this invention is to provide a simpler, more economical and more reliable method and pre-cast panel configuration so that precast concrete panels having channels may be more efficiently connected to one another in the erection of a precast concrete tank.
, It is also an object of this invention to avoid the expense of providing and handling separate cover plates as are used in U.S. P~tent No. 3,280,525.
It is also a very important object of this invention to reduce the number of seals in the joinery between the adjacent concrete panels so that the chance of leakage from within the tank is reduced and the amount o sealant and the work necessary to apply that sealant is also reduced.
These and other objects of this invention are achieved in a prestressed concrete tank having a core wall comprising elongated panels of precast concrete having on their outer faces, a sheet of sheet metal presenting parallel, longitudinal, undercut channels. The panels also include two lateral, sheet metal flanges which extend parallel with the elongated sides of the panels and laterally outwardly therefrom. The panels are assembled in spaced, side-by-side ( ~7192 ~9573~
relationship such that the sheet metal flanges on adjacent panels overlap one another. The overlapping flanges are then fastened to one another, preferably with sheet metal screws and an elastomeric compound is used to seal the join~. The advantages of the instant invention are ~ha~ the steel skin over the filler joints is part of the steel skin on the panels and a separate cover plate is not required. Moreover, when the concrete panels are erectedJ the joint cover is automatically in place except for sealing and this eliminates the problem of handling a separate cover plate. Also,there is only one joint line to seal with elastomeric compound versus two joint lines in the tank configuration of U.S. Patent No. 3,28Q,525 and thus the amo~nt of elastomeric material and labor that is required is reduced by about one half. The invention reduces the chance o~f leakage from the tank considerably.
The foregoing invention is highly satisfactory in eliminating expensive cover plates, reducing the joinery and reducing the likelihood of leakage. ~owever, it has now been found that by providing the sheet metal diaphragm with seamed joints set within the precast concrete, the resulting pre-stressed tank is even more reliable and satisfactory.
It is a further object of the present invention to provide an improved precast concrete panel which further reduces the likelihood of leakage from the tank.
It is a further object of the present invention t~
provide an improved means of securing the steel metal sheet to the precast concrete of the panel.
It is also an object of the present invention to provide an improved means for preventing the sheet metal diaphragim from peeling away from the precast concrete a~ the edge of each panel.
( ~7192 These and other objects of this invention are achieved in a panel, having on its outer surface a plurality of elongated sheets of sheet metal. At least one of the sheets of sheet metal has parallel longitudinal undercut channels and each sheet has at least one lip which extends from the interior side of the sheet metal sheet into the precast concrete. The lips of adjacent sheets are fastened together to form a joint in ~he precast concrete. The advantages of such a construction are that, in addition to the securing effect achieved by the undercut channels in the sheet metal, the joint is firmly anchored in the precast concrete thus securing the sheet metal to the precast concrete.
At the edge of the panel, the joint anchored in the precast concrete prevents the sheet metal rom peeling away from the precast concrete. This minimizes the tendency of the sheet metal diaphragm to peel away from the edge of the panel and thereby improves the joint between adjacent panels and minimizes leaks in the tanks at positions where adjacent panels are connected. At positions interior to the edge ~f the panels, the joint locks the sheets together and fixedly secures them to the precast concrete.
Furthermore, it has now been found that the above-mentioned seaming technique is not only useful in seaming metal sheets together in the formation of precast concrete panels but is also useful in seaming adjacent panels together thus producing a prestressed tank which is even more reliable and economical.
It is an object of the invention to eliminate the use of sealant in ioining the adjacent precast concrete panels together.
371g2 ~ 3~
It is also an object of the invention to allow formation of panels and tanks using a single seaming device thus reducing costs and complexity.
It is also an important object of this invention to create a tighter, more waterproof seam between adjacent panels thus reducing the chance of leakage from within the tank.
Likewise, it is an object of the invention to provide a reliable seam between adjacent panels which does not require the penetration of the sheet metal with sheet metal screws.
These and other objects of the invention are achieved in a prestressed concrete tank having a core wall comprising elongated panels of precast concrete having on their outer faces a sheet of sheet metal presenting parallel t .
longitudinal, undercut channels. The panels include lateral sheet metal flanges which extend parallel to the elongated sides o the panels and laterally outward therefro~. The flanges have a ~lange lip on the outermost edge o~ the flange.
The lip extends outwardly from the tank in a direction substantially perpendicular to the panel. The panels are assembled in spaced, side-by-side relationship such that the flange lips of adjacent panels are spaced from one another. A sheet metal splice member having a channel shape is interposed in the space between the flange lips oX ~he adiacent panels. The splice member has upstanding sides which abut the lips of the adjacent panels. The upstanding side and the flange lip adjacent to it are seamed together in a tight fold, thus locking the adjacent panels together.
The advantage of this technique is that it creates ~k9 ~7 3~
tighter, more wate~proof seam between adjacent panels without penetr~ting the sheet metal diaphragm with sheet metal screws or other fasteners. Furthermore, such a joint eliminates the use of sealants in joining adjacent paneIs.
More particularly, there i5 provided:
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on a face a sheet of sheet metal presenting parallel longitud-inal undercut channels and a lateral, sheet metal flange extend-ing parallel with the elongated sides of said panels and later-ally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent panels being spaced from one another; a sheet metal, channel shaped splice member interposed in said space between the flange lips of adjacent panels, said splice member having upstanding sides which abut the flange lips of adjacent panels and said flange lip and abutting upstanding side being seamed together in a tight fold, thereby locking adjacent precast concrete panels together with a watertight seam.
There is also provided:
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on a face a sheet of sheet metal presenting parallel longitudinal undercut channels and a lateral sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent paneIs being aligned adjacent to and abutting ~`9~73~
each other and said flange lips being seamed together in a tight fold thereby locking adjacent precast panels together in a water-tight seam.
There is also provided~
A method for forming prestressed concrete tanks com-prising the steps of aligning elongated precast concrete panels side by side, said concrete panels having a sheet metal flang~
which extends parallel with the elongated sides of the panels and laterally outwardly therefrom said sheet metal flange having a flange lip extending from said tank in a direction substantial-ly perpendicular to the panel and being adjacent to and abutting the flange lip of the adjacent panel; seaming the adjacent flange lip together in a tight fold; and depositing concrete in the space formed between the outwardly extending flanges and precast concrete of adjacent panels.
There is further provided:
An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on its outer face a sheet of sheet metal presenting parallel longitudinal undercut channels and a lateral, sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends outwardly from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent panels being spaced from one another; a sheet metal, channel shaped splice member interposed in said space between the flange lips of adjacent panels, said splice member having upstanding sides which abut the flange lips of adjacent panels and said flange lip and abutting upstanding side being seamed together in a tight fold, thereby locking ad-jacent precast concrete panels together with a watertight seam.
- 7a -73t~
There is also provided;
A method of forming paneIs for use in prestressed concrete tanks comprising the steps of: laying a plurality of elongated metal sheets of steel in side-by-side relationship, each of said sheets having an interior and exterior side, at least one of said sheets having parallel longitudinal undercut channels and each sheet having a lip extending inwardly at each elongated edge thereof, the lips on adjacent sheets abutting one another; laying sheet metal flanges parallel to and adjacent the two elongated sides of the plurality of elongated metal sheets, each of said flanges having a lip extending inwardly and abut-ting a lip on the adjacent sheet of sheet metal; seaming the abutting lips of said sheets of sheet metal and sheets of sheet metal and flanges, respectively, in a continuous tight fold; and depositing concrete on the interior side of said sheet, the said continuous tight folds extending into the deposited concrete and serving to anchor the sheet metal sheets and flanges therein.
The invention is more fully described in the accompanying drawings, in which:
FIG. 1 is a cross sectional plan view of portions of the concrete tank of this invention showing the assembled panels;
and FIG. 2 is an elevation view along lines 2-2 of FIG l; and FIG. 3 is a further cross sectional plan view of a com-pleted tank according to the invention.
FIG. 4 is a cross sectional plan view of portions of the concrete tank of this invention showing the assembled panels and the seamed joints.
FIG. 5 is a cross sectional plan view of a pair of ad-jacent sheet metal sheets and the lips provided thereon prior to seaming.
FIG. 6 is a cross sectional plan view of a preferred - 7b -~q~ i73&;
embodiment of a pair of adjacent sheet metal sheets and the lips provided thereon prior to seaming.
FIG. 7 is a cross sectional plan view of a pair of ad-jacent sheet metal sheets showing a seamed joint according to the present invention.
FIG. 8 is a cross sectional plan view of a pair of ad-jacent sheet metal sheets showing a preferred seamed joint according to the present invention.
FIG. 9 is a cross sectional plan view of a portion of the concrete tank showing the splice member interposed between the flange lips of the adjacent panels prior to seaming.
FIG. 10 is a cross sectional plan view o a portion of the concrete tank showing the improved means for locking adjacent panels together.
In Figure 1, reference 10 refers generally to a concrete core wall formed from two precast concrete panels 12 and 14~ Each of panels 12 and 14 has an outer face of sheet metal 16 which presents a plurality of paralle~l>
longitudinal undercut channels 18. The steel sheet 16 on each of panels 12 and 14 extends past the edge of the panel to form a flange 20 on panel 12 and a flange 22 on panel 14.
These flanges extend parallel w,ith the vertical sides of panels 12 and 14 and extend laterally outwardly therefrom.
Panels 12 and 14 are separated by space 24.
With reference to Figure 2, flanges 20 and 22 on panels 12 and 14, respectively, overlap one another and are fastened to one another by means of sheet metal screws 26.
The joint is filled with an elastomeric material 28 and the entire joint between panels 12 and 14 is filled with filler concrete 30. The elastomeric materials which are used to seal the joint may be any of those known for this purpose including silicone rubbers, polysulfides and the like.
After the core wall is erected as described, an intermediate wall 32 of cement is ormed on the ~uter steel facing of the panels. Pneumatically proiected mortar is used to form an outer coating or wall which tightly seals in the parallel, lon~itudinal, undercut channels 18 in the sheet metal facing of the panels. After the intermediate wall 32 is formed the tank may be prestress~d by wires 34 ` 37192 ~1'`9~i736 and the wires are covered with a further cementitious covering 36.
Figure 4 is essentially the same as Figure 1 except that the seamed joints 11 have been added at interior portions of each panel and at the panel edges. Each panel 12 and 14 is made up of more than one metal sheet. The sheets 16a, 16c and 16e contain parallel, longitudinal undercut channels 18. The edge of panel 12 is provided with sheet 16b and the edge of panel 14 is provided with sheet 16d, neither of which have undercut channels. The lateral extensions of sheet 16b and 16d form flanges 20 and 22, respectively. The adjacent sides of sheet metal are provided with lips-which have been seamed together to form a joint 11, which is anchored in the precast concrete.
The joint may be formed by using the seaming . ..
machine disclosed and described in U.S. Patent No. 3,120,828.
More specifically, the machine presently being used to form the seams is the ~OOF RUNNEP~ machine which is available from the Butler Research Co., Kansas City, Mo. Referring to,Figures 4 and 5, the metal sheets 16a and 16c are provided with upstanding lips 15 and 17 which are in abutting side-by-side relationship. Likewise, in order to form the joint at the edge of the panel 12, the metal sheets 16a and 16b are provided with upstanding lips 15 and 17 arranged in abutting side-by-side relationship. Preferably the sheets to be joined by seaming are laid flat upon a ~or~ surface with the lips extending upwardly.
The seaming device is placed at one end of the upstanding lips 15 and 17 and the carriage is moved along the lips. A series of rolls and counterrolls cause lip 15 ~J`~i'736 to be folded over or together with and over lip 17 seaming the two adiacent sheets together into a folded joint 13 as shown in Figure 7. A second pass of the seaming machine causes the folded joint 13 tv be ~olded again into the joint 11 as shown in Figure ~. After the joint ll is formed the panel is completed by depositing hydraulic concrete upon the sheet metal. .The concrete covers the joint ll thereby locking the sheet into the concrete.
Referring to Figure 6, a preferred lip form is - shown. The preferred lip form includes a male lip 21 and female lip 19 which are prerolled by conventional methods.
The male lip 21 is formed by turning back the metal. The female lip 19 is turned over the male lip 21 to form an inverted V with an angle of approximately 30C. The advantage of this preferr~d lip form is that a single pass ..
of the seaming machine will result in the formation of the doubly folded joint shown in Figure 8.
Figures 9 and 10 are essentially the same as Figure 4 except that the improved method of joining the precast panels is illustrated.
Referring to Figures ~ and 10, the flanges 20 and 22 are provided with flan~e lips 23 and 29~ respectively, which extend outwardly from the tank in a direction substantially perpendicular to the panel. The panels 12 and 14 are erected such that there is a space between them. A
channel shaped splice member 16f is interposed in the space between the panels 12 and 14. The splice member 16f is sheet metal and has two upstanding sides 25 and 27. Side 25 abuts flange lip 23 and side 27 abuts flange 29. Using the ROOF RUNNERT machine in the same manner described above for ii736 the formation of joints 11, except that it is used to vertically seam the adjacent erected panels, tightly fol~d seams 31 are formed. The entire space hetween panels 12 and 14 is filled ~ith filler concrete 30.
Another embodiment of the invention comprises aligning panels 12 and 1~ so that flange lips 23 and 29 are side-by-side and abutting in a manner analogous to Figures 5 or 6 and forming a single seam to join the adjacent precast panels.
The majority of the time the placement of the sheet metal diaphragm is on the outside surface of the struct-lre.
However, there are times, pi-lmarily due to job site condition~;, exterior connections or inability to brace inwardl~, where the sheet rnetal diaphragm is placed on the inside surface of ~he stmcture. lhis is accommcdated by reversing the dircction of the curvature in the panel beds. All other aspects of the description re.main identical but, on the interic)r surface except for the horizontal prestressing which remains on the exterior of the structure.
~"V
Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on a face a sheet of sheet metal presenting parallel longitudinal undercut channels and a lateral, sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends from the tank in a direction substantially perpendicu-lar to the panel, said flange lips of adjacent panels being spaced from one another; a sheet metal, channel shaped splice member interposed in said space between the flange lips of adjacent panels, said splice member having upstanding sides which abut the flange lips of adjacent panels and said flange lip and abutting upstanding side being seamed together in a tight fold, thereby locking adjacent precast concrete panels together with a watertight seam.
2. A concrete tank as recited in claim 1, wherein each of said panels has on a face a plurality of elongated sheets of sheet metal, at least one of said sheets presenting parallel longitudinal undercut channels, said sheets having a lip extending inwardly into the precast concrete, said lips of adjacent sheets being fastened together to form a joint which is set within the concrete.
3. A concrete tank as recited in claim 2, wherein said joint is formed by seaming the lips together in a tight fold.
4. A concrete tank as recited in claim 1, wherein said flange lip and abutting upstanding side have lengths that differ and are seamed together by folding the longer length over the shorter length in a tight fold.
5. An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on a face a sheet of sheet metal presenting parallel longitudinal undercut channels and a lateral sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends from the tank in a direction substantially perpendicular to the panel, said flange lips of adjacent panels being aligned adjacent to and abutting each other and said flange lips being seamed together in a tight fold thereby locking adjacent precast panels together in a watertight seam.
6. A method for forming prestressed concrete tanks comprising the steps of aligning elongated precast concrete panels side by side, said concrete panels having a sheet metal flange which extends parallel with the elongated sides of the panels and laterally outwardly therefrom said sheet metal flange having a flange lip extending from said tank in a direction substantially perpendicular to the panel and being adjacent to and abutting the flange lip of the adjacent panel;
seaming the adjacent flange lip together in a tight fold; and depositing concrete in the space formed between the outwardly extending flanges and precast concrete of adjacent panels.
seaming the adjacent flange lip together in a tight fold; and depositing concrete in the space formed between the outwardly extending flanges and precast concrete of adjacent panels.
7. A method for forming prestressed concrete tanks comprising the steps of aligning elongated precast concrete panels side by saide, said concrete panels having a sheet metal flange which extends parallel with the elongated sides of the panels and laterally outwardly therefrom, said sheet metal flange having a flange lip extending from said tank in a direction substantially perpendicular to the panel, said flange lips of adjacent panels being spaced from one another; inter-posing a splice member between the flange lips of adjacent panels, said splice member having upstanding sides which abut the flange lips of adjacent panels; seaming the upstanding side and abutting flange lip together in a tight fold; and depositing concrete in the space formed between the outwardly extending flanges, the splice member and the precast concrete of adjacent panels.
8. An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in spaced, side-by-side relationship, each of said panels having on its outer face a sheet of sheet metal pre-senting parallel longitudinal undercut channels and a lateral, sheet metal flange extending parallel with the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flange having a lip on the outermost edge of said flange which extends outwardly from the tank in a direction substan-tially perpendicular to the panel, said flange lips of adjacent panels being spaced from one another; a sheet metal, channel shaped splice member interposed in said space between the flange lips of adjacent panels, said splice member having up-standing sides which abut the flange lips of adjacent panels and said flange lip and abutting upstanding side being seamed together in a tight fold, thereby locking adjacent precast concrete panels together with a watertight seam.
9. A panel as recited in claim 8, wherein the lips of adjacent sheets are fastened together to form a joint by seaming the lips together in a tight fold.
10. A panel as recited in claim 8, wherein a said joint is positioned in the concrete near the edge of said elongated panel.
11. A panel as recited in claim 8, wherein the lip on one of said adjacent sheets is longer than the lip on the sheet to which it is to be joined and said joint is formed by folding said longer lip over or together with and over said shorter lip in a tight fold.
12. An improved prestressed concrete tank having a core wall comprising elongated panels of precast concrete assembled in a spaced side-by-side relationship, each of said panels having on its outer face a plurality of adjacent elongated sheets of steel sheet metal, at least one of said sheets presenting parallel longitudinal undercut channels, and two lateral sheet metal flanges extending parallel to the elongated sides of said panels and laterally outwardly therefrom, said sheet metal flanges overlapping the flanges of adjacent panels and being fastened thereto to connect the side-by-side spaced panels, wherein each sheet on said panels has a lip at each elongated edge thereof extending inwardly into the precast concrete, the lips of adjacent sheets abutting one another and being folded together in a continuous tight metal-to-metal seamed joint which is set within the concrete, thereby locking said sheets together and fixedly securing the sheets to the concrete, and wherein each flange has a lip on an edge thereof which abuts a lip on the adjacent sheet of sheet metal, said abutting lips being folded together in a continuous tight metal-to-metal seamed joint which is likewise set within the concrete, thereby locking said sheet and flange together and fixedly securing both to the concrete.
13. A tank as recited in claim 12 wherein the said seamed joints between the flanges and the adjacent sheets of sheet metal are positioned in the concrete near the edge of said panel.
14. A tank as recited in claim 13 wherein the lip on an adjacent sheet or flange is longer than the lip on the sheet or flange to which it is to be joined and said joint is formed by folding said longer lip over or over and together with said shorter lip in a continuous tight fold.
15. A method of forming panels for use in prestressed concrete tanks comprising the steps of: laying a plurality of elongated metal sheets of steel in side-by-side relationship, each of said sheets having an interior and exterior side, at least one of said sheets having parallel longitudinal undercut channels and each sheet having a lip extending inwardly at each elongated edge thereof, the lips on adjacent sheets abutting one another; seaming the lips together in a continuous tight fold;
and depositing concrete on the interior side of said sheet, the said continuous tight folds extending into the deposited concrete and serving to anchor the sheet metal sheets therein.
and depositing concrete on the interior side of said sheet, the said continuous tight folds extending into the deposited concrete and serving to anchor the sheet metal sheets therein.
16. A method of forming panels for use in prestressed concrete tanks comprising the steps of: laying a plurality of elongated metal sheets of steel in side-by-side relationship, each of said sheets having an interior and exterior side, at least one of said sheets having parallel longitudinal undercut channels and each sheet having a lip extending inwardly at each elongated edge thereof, the lips on adjacent sheets abutting one another; laying sheet metal flanges parallel to and adjacent the two elongated sides of the plurality of elongated metal sheets, each of said flanges having a lip extending inwardly and abutting a lip on the adjacent sheet of sheet metal; seaming the abutting lips of said sheets of sheet metal and sheets of sheet metal and flanges, respectively, in a continuous tight fold; and deposit ing concrete on the interior side of said sheet, the said con-tinuous tight folds extending into the deposited concrete and serving to anchor the sheet metal sheets and flanges therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA357,827A CA1098332A (en) | 1977-08-18 | 1980-08-07 | Prestressed concrete tank |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US825,832 | 1977-08-18 | ||
| US05/825,832 US4124960A (en) | 1975-12-01 | 1977-08-18 | Prestressed concrete tank having seamed diaphragm joints securing adjacent precast concrete panels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1095736A true CA1095736A (en) | 1981-02-17 |
Family
ID=25245020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA308,405A Expired CA1095736A (en) | 1977-08-18 | 1978-07-28 | Prestressed concrete tank |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1095736A (en) |
| ZA (1) | ZA784364B (en) |
-
1978
- 1978-07-28 CA CA308,405A patent/CA1095736A/en not_active Expired
- 1978-08-01 ZA ZA00784364A patent/ZA784364B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA784364B (en) | 1979-07-25 |
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