CA1326139C - Storage vault and method - Google Patents
Storage vault and methodInfo
- Publication number
- CA1326139C CA1326139C CA000616224A CA616224A CA1326139C CA 1326139 C CA1326139 C CA 1326139C CA 000616224 A CA000616224 A CA 000616224A CA 616224 A CA616224 A CA 616224A CA 1326139 C CA1326139 C CA 1326139C
- Authority
- CA
- Canada
- Prior art keywords
- concrete
- container
- base plate
- enclosure
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method for entombing a container within a homogeneous layer of concrete comprising the initial step of selecting a container having a container top. A base plate is placed on a support surface and wall forms are positioned on the base plate. The wall forms are fastened to one another to create a sidewall form. The sidewall form is positioned relative to the base plate wherein the positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form. A first portion of concrete is poured onto the base plate to form a bottom layer of concrete in the enclosure. The container is lowered into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container.
The container is vertically restrained within the enclosure, such that the container contacts the bottom layer of concrete on subsequent pouring of concrete. A second portion of concrete is poured into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete wherein the first portion of concrete and the second portion of concrete form a homogeneous entombing layer of concrete about the vertically restrained container. The homogeneous layer of concrete is allowed to set and the wall forms and the base plate are removed from the concrete encased container. Also disclosed is the apparatus for performing the above method.
A method for entombing a container within a homogeneous layer of concrete comprising the initial step of selecting a container having a container top. A base plate is placed on a support surface and wall forms are positioned on the base plate. The wall forms are fastened to one another to create a sidewall form. The sidewall form is positioned relative to the base plate wherein the positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form. A first portion of concrete is poured onto the base plate to form a bottom layer of concrete in the enclosure. The container is lowered into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container.
The container is vertically restrained within the enclosure, such that the container contacts the bottom layer of concrete on subsequent pouring of concrete. A second portion of concrete is poured into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete wherein the first portion of concrete and the second portion of concrete form a homogeneous entombing layer of concrete about the vertically restrained container. The homogeneous layer of concrete is allowed to set and the wall forms and the base plate are removed from the concrete encased container. Also disclosed is the apparatus for performing the above method.
Description
~ 132613q STORA~E VAULT AND METHOD
The present application is divided from Canadian Patent Application Serial No. 553,174 filed November 30, 1987.
This invention relates to a method of constructing a storage container and apparatus for con~tructing the container.
There is a continuing interest in the safe ~ 10 containment of liquids, particularly gasoline and other fuels, because of the vast amount of fuel presently stored throughout the country. It has become increasingly apparent that underground storage tanks can and do leak, thus causing serious short-term and long-term problems. Therefore, many localities have chosen to examine all underground tanks, mostly fuel storage tanks, to determine if the tanks are leaking. It is an expensive process to inspect the tanks and test the earth surrounding the tanks for indications of ~ leakage. Repair or replacement of tanks which are shown to `~ 20 be leakin~ increa~es the cost a great deal further.
To aid the detection and prevention of leaks, double wall ~dual containment) tanks have been used for both -~ underground and above ground storage. The space between the two walls of the tanks i8 monitored for leakage. When used underground, nitors can be used to sense both water seepage in and stored liquid seepage out. If a leak is detected, the tank can be drained and abandoned, dug up and removed, or repaired in place. These options are all quite expensive. If the contaminated soil surrounding the leaking tank must be removed, the expense increases dramatically.
However, conventional double wall tanks are quite expensive ~ and are not presently able to meet fire code ~tandards for `` above-ground storage of flammable liquids. Therefore, even `` when dual containment tanks are u#ed, flammable liquid is ; 35 most o~ten stored in below-ground tanks~
Creating a concrete encased hollow tank is not without problems. One conventional method of doing ~r.
.
. :
~' ` :
. ; -...... . ~ , ~
so is to form an open-top hollow shell, place the tank within the hollow shell and then pour the top. However, this process creates cold joints which are po~sible sources of lea~s and weak points in the structure. Therefore, a homogeneous concrete shell, which would eliminate cold joints, would be preferable. Entombing a hollow tank in fluid concrete is hindered~ if not prevented by the fact that the hollow tank has a tendency to bob up or float within the fluid concrete. Although the tank could be filled with water to give it neutral buoyancy, this solution causes other problems, including difficulties arising from trying to remove all the water from the tank after the concrete has set.
In a first aspect the present invention provides a `~ 15 method for entombing a container within a homogeneous layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastenin~ the wall forms to one another to create a sidewall form:
positioning the sidewall form relative to the base plate wherein the positioning of the sidewall creates an open top enclosure bounded by the base plate and the ~5 sidewall form:
pouring a first portion of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
lowering the containèr into the enclosure until the container re~t~ on the bottom layer of concrete to define a region within the enclosure 4urrounding at least a portion of the container;
vertically re~training the container within the enclosure, such that the container contacts the bottom layer of concrete subse~uent pouring of concrete;
pouring a ~econd portion of concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom ' .,., ~ , :, , layer of concrete wherein the fir~t portion of concrete and the second portion of concrete form a homogeneous entombing layer of concrete about the vertically restrained container:
allowing the homogeneous layer of concrete to set:
and ` removing the wall forms and the base plate from the concrete encased container.
- In a second aspect, the present invention provides a method for entombing a container within a homogeneous - 10 layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastening the wall forms to one another to create :i 15 a sidewall form;
positioning the sidewall form relative to the base plate wherein said positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form:
2~ pouring a layer of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
- lowering the container into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container;
vertically restraining the container within the enclosure, such that the container contacts the bottom layer of concrete during subsequent pouring of concrete;
wherein the vertically restraining step includes " 30 the steps of;
positioning a hold-down member over the open top of the container so as to overlie the container;
connecting the hold-down member against the top of ` the container;
: 35 pouring concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete to .
, ., - , . .
,.................................... , , . :
_ 4 _ ~ 1 3 26 1 3 9 form a homogeneous entombing layer of concrete about the vertically restrained container;
allowing the concrete to set; and removing the wall forms and the base plate from the concrete encased container.
The present invention also provides an apparatus for encasing a tank in a homogeneous layer of - concrete comprising:
a base plate;
wall forms combinable to create a circumferential ~idewall form;
means for securing the wall forms to one another;
means for laterally positioning the sidewall form on the base plate, the sidewall form and base plate defining an enclosure;
a hold-down member having a tank engaging element;
means for mounting the hold-down member over the enclosure, the tank engaging member adapted to engage a tank within the enclosure; and means, coupled to the base plate, for forcing the hold-down member a~ainst the tank to counteract any upward buoyant force of the tank caused when concrete is poured into a portion of the enclosure surrounding the tank.
Other features and advantages of the invention will appear from the following description in which the preferred embodiments have been set forth in detail in conjunction with the accompanied drawings.
Fig. 1 is a side cross-sectional view showing a vault made according to the present invention.
.. ~
., , ., , ' .
~ 1326139 Fig. 2 is an exploded cross-sectional view taken along line 2-2 of Fig. 1.
Fig. 3 is a schematic illustration showing a method for making the vault of Fig. 1.
Fig. 4 shows the inner tank of Figs. 1-3 within the form assembly of Fig. 3.
Fig. 5 illustrates the internal reinforcing members of the inner tank of Fig. 4 allowing the tank to be used as a pressure vessel.
:`
:
.
.
~ ' . ' ' '; - .: - ' . . ' . , ... . . .
.. .~ .
Referring now to Figs. 1 and 2, a vault is shown to include a steel inner tank 4 surrounded by a spacer layer 6 of polystyrene. Inner tank 4 and spacer layer 6 are entombed or encased within an outer tank 8. Outer tank 8 includes a concrete layer 10 strengthened by rebar 12, and a liquid impervious liner 14, preferably by a sheet of ; polyurethane film. Conventional fill and vent pipes 16 ` extend from inner tank 4. A leak detector tube 20 is - positioned between inner tank 4 and liner 14 and terminates at a liquid collection region 22. Tube 20 permits leaks from inner tank 4 to be monitored as the leaking liquid collects within region 22.
spacer layer 6 performs a dual function. Spacer layer 6 is a good thermal insulator so to insulate the - 15 contents of inner tank 4 from external heat sources, such as forest fires. In addition, spacer layer 6 helps keep the contents of inner tank 4 at a more uniform temperature than would otherwise exist. This helps reduce vapour pressures j within inner tank 4 making the storage of liquids safer and reducing the potential for vapour leaks to the atmosphere.
In addition, spacer layer 6 is chosen so that it melts or liquifies when the liguid within inner tank 4 contacts the ` material of the spacer layer. Typically, inner tank 4 will hold a liquid hydrocarbon fuel, such as gasoline or diesel - 25 fuel. By choosing a spacer layer 6 made of polystyrene, if the liguid within tank 4 leaks throu~h and contacts spacer layer 6, poly~tyrene spacer layer 6 melts or dis~olves thus creating an open region between inner tank 4 and outer tank 8 permitting the leaked hydrocarbon to collect at liquid collection region 22. This permits the leak to be guickly noticed through leak detector tube 20 using conventional methods.
As a further aid to detection of leaks, outer tank 8 includes bottom supports 24 which raise the bottom 26 of ` 35 vault 2 above the support surface 28 to create an inspection region 30 between bottom 26 and support surface 28. If . , , -. ` .
' :
. ; - ~ ` ' _ 7 _ 1 326 1 39 desired support surface 28 can be covered with a sheet or layer to aid visual inspection of leaks.
Turning now also to Fig. 3, a simplified view of the method for makin~ vault 2 is shown. First, an appropriate inner tank 4 is selected and has a number of polystyrene panels 32 secured to the outer surface 34 of inner tank 4, typically by an adhesive. A large sheet 36 of ; a liquid impervious material, such as polyethylene film, is ` wrapped around the spacer layer encased inner tank. The edges 38 of sheet 36 are gathered over the top 40 of inner tank 4 so to create a second liquid barrier.
A concrete form assembly 42 is used to entomb the inner tank 4, spacer layer 6, liner 14 combination. Form assembly ~2 includes a base plate 44, having a pair of openings 46, used to form bottom supports 24, and two L-shaped wall forms 48, 50~ Wall forms 48, 50 constitute a sidewall form 51. After assembly of base plate 44 and wall forms 48, 50, a rebar ca~e 52 is placed within an enclosure 54 defined by wall forms 48, 50 and base plate 44. A layer 56 of concrete is then poured within enclosure 54 to cover base plate 44. The combination 58 of inner tank 4, spacer layer 6 and sheet 36, which creates liner 14, is then positioned within enclosure 54 on top of the still wet layer 56 of concrete. Additional concrete is then placed within ` 25 the region 60, see Fig. 4, between combination 58 and wall forms 48, 50 sufficient to cover combination 50 and be gen-erally level with top edge 62 of sidewall form 51. The specific construction of form assembly 42 will now be discussed with reference to Fig. 4, in particular the Qtructure for keeping combination 58 from bobbing up out of the fluid concrete.
Form assembly 42, in addition to wall forms 48, 50 and base plate 44, includes a pair of form clamp assemblie~
~ 64 at opposite corners 66, 68 of sidewall form 51, a lateral -` 35 positioning assembly 70 adjacent base plate 44 and a pair of hold-down assemblies 72 which keep inner tank 4 from floating within the concrete while it is fluid.
.
: .............................. , . ... , . .. .. . - i . ., , ,.,.,., ,.. ", .... ..
.."
- . ,, '. ~.. ,~,.,~ ' ;.. . .... ..
;~. . , t :. .. ..
Clamp assemblies 64 each include an L-bracket 73.
welded to sidewall form 51, and a chain 74, secured at one end to L-bracket 73 by an adju~tment bolt 76. Chain 74 has a hook 78 at the other end which engages the corner of the adjacent wall form 48 or S0. Chain 74 is tightened using a ; chain binder 80 which allows the user to easi~y apply a strong clamping load on the two wall forms 48, 50.
Adjustment bolt 76 can be used to provide any necessary fine adjustment to the tension in chain 74. It has been found that use of two L-shaped wall forms 48, 50 and four form clamp assemblies 64 allow wall form 50 to be easily but securely fastened to~ether while ensuring the proper, in this rectangular, shape is maintained.
Lateral positioning assemblies ?0 each include a jack block 82 welded to base plate 44 at a position spaced ~ apart from wall forms ~8. 50. A hydraulic jack 84 is - mounted between each jack block 82 and the opposing side of wall forms 48, 50. Applying sufficient force on wall forms 48, 50 through the use of jacks 84 positions sidewall form 51 on base plate 44 and keeps the lower ends of sidewall form 51 from moving laterally outwardly due to the pressure of the concrete while it is still fluid.
Each hold-down assembly 72 includes an elongate hold-down bar 86 having chamfered ends 88 guided between ~ertical guide plates gO. Guide plates 90 are mounted to wall forms 48, 50 and extend above top edge 62. Hold-down bar 86 has a pair of downwardly extending hold-down tubes 92 depending from its bottom surface 94 and a strong back 96 mounted centrally above the top surface 102 of hold-down bar 86. Strong back 96 has an arauate guide surface 98 and a pair of vertical guide plates 100. Hold-down assembly 72 includes a chain 104 having each end 106 secured to an anchor point 108 on jack block 82. Chain 104 passes from the jack block 82 on one side of form assembly 42, between vertical guide~ 90, across chamfered ends 88, over curved ~urface 98 of strong back 96 and down past the chamfered ends of holddown bar 86 on the other side. Hold-down assembly 72, also includes a chain ratchet 110. Chain ; ~ .
~ .
.:
... . . . .
~, : -. . ~ . , ~ 1326139 g ratchet 110 is used to shorten the effective of length of chain 104 thus forcing tubes 92 a~ainst the top 112 of inner tank 4.
Guide rings 114, each having an internal diameter slightly larger than the external diameter of tuhes 92, are welded to top 112 at positions chosen to engage the lower ends of tubes 9? , Once so engaged, lateral, as well as upward, movement of inner tank 4 within enclosure 54 is substantially eliminated.
Strong back 96 is used to strengthen hold-down assembly 72. Strong back 96 keeps hold-down bar 86 from bowing upwardly due to the upward force on the hold-down bar caused by tank 4 attempting to float when surrounded by fluid concrete~
Turning now to Fig. 5, an inner tank 4, is shown to include U-channel reinforcing members 13n welded to the inside surface 13~ of inner tank 4, so that inner tank 4, may be used as a pressure vessel. Reinforcing members 130 form a number of hoops 134 circumscribing the interior of `~`v 20 tank 4. The ends 136 of inner tank 4, have vertically : extending reinforcing members 130 mounted along their interior surfaces as well. Pairs of reinforcing members 130 are placed back to back at positions 138 along top 112 of inner tank 4, and at poæitions 140 along the bottom 142 of inner tank ~. This provides extra strength along the central portion of tank 4. A pair of lifting brackets 144 are welded to top 112 of tank 4, adjacent positions 138 to facilitate moving tank 4.
A vault 2 made with an inner tank 4, can be used as a vacuum storage vessel to safely handle waste motor oil or crank case motor oil. The vault incorpora~ing reinforced inner tank 4 could have a vacuum continuously applied to the inner interior of inner tank 4. A hose ~not shown) would then be used to connect inner tank 4, to the oil, or other liquid, to be disposed of. The waste oil so collected could then periodically be removed from the vault through the use of, for example, a mobile vacuum tank truck which can suck the waste oil directly out of the inner tank 4, and into the ~ 132613q mobile tank. This would permit gasoline service stations.
~- auto dealers, lube and oil change centers, among others, to safely and conveniently store the waste oil and grease in a safe, cost-effective manner. Even without creating a vacuum 5 in the interior of a vault 2, vault 2 would still be useful for safely and inexpensively storing such waste oil, waste grease and other flammable materials, by pumping or pouring the waste material directly into the vault.
; To use form assembly 42, base plate 44 is 10 positioned on a, preferably, level support surface. Wall forms 48, 50 are positioned on base plate 44 and are ` fastened to one another by form clamp assemblies 64 at each < corner 66, 68. Hydraulic jacks 84 are then operated to properly position sidewall form 51 on base plate 44 and keep 15 the bottom of the sidewalls from kicking out due to the pressure of the fluid concrete. Rebar cage 52 is then placed within enclosure 54 and a layer 56 of concrete is poured into enclosure 54 to create bottom 26 of outer tank 8. Combination 58, see Fig. 3, is then lowered into 20 enclosure 54 until it rests on layer 56 of concrete.
Hold-down bars 86 are then positioned over enclosure 54 and lower ends of tubes 92 are positioned within rings 114. Chains 104 are then placed over hold-down bar 86 and fastened to jack blocks 82 at anchor points 108.
Chain ratchets 110 are used to tighten chains 104 sufficiently to place an appropriate force on hold-down bars 86. Concrete is then poured into enclosure 54 to entomb combination 58, with the exception of various fill and vent pipes 16 extending up through concrete outer tank 8. Note that layer 56 of concrete is still wet when the subsequent ~` pour of concrete is made. This ensures a homogeneous concrete layer 10 with no cold joints. Sidewall form 51 is then vibrated to settle the aggregate in the concrete. The top surface 120 of outer tank 8 is smoothed~ Shear pins 122 can be used to keep hold-down bars 86 from moving upwardly past upper holes 124 in vertical guides 90.
Once the concrete has set sufficiently, chain ratchets 110 are actuated to loosen chains 104 shear pins ~` . . - . .
- . -~
122 are removed from holes 124 and hold-down bars 86 are - lifted upwardly to remove tubes 92 from the layer of concrete covering top 112 of inner tank 4. ~he holes left by removal of tubes 92 are filled with fresh concrete.
`- 5 After the concrete has cured sufficiently, sidewall form 51 ~ is removed from vault 2 and vault 2 is separated from base -~ plate 44.
`~ Modification and variation can be made to the disclosed embodiments without departing from the subject of the invention as defined by the following claims. If desired, non-flamm~ble liquids can be stored in vault 2.
Although it is preferred to include rebar cage 52 as a part of outer tank 8, one need not necessarily do so. Inner tank ~:.
4, although in the preferred embodiment made of steel could be made of other suitable material according to the particular liquid being contained and the environment. It is preferred that vault 2 have a flat bottom for stability.
However, other shapes are also possible. Vertical force can .~ be applied to inner tank 4 during curing of the concrete in ways not shown. For example, tubes 92 could be replaced by I-beams permanently mounted to inner tank 4 and left within concrete top 126. Also, by appropriately positioning fill and vent pipes 16, the tops of these pipes may be used to apply the necessary vertical force on inner tank 4 to keep the inner tank from floating before the concrete has set.
One or both of chain binders 80 and chain ratchets 110 may be replaced by other suitable tightenin~ devices, such as hydraulic push-pull jacks.
~`
~.
. .
.
The present application is divided from Canadian Patent Application Serial No. 553,174 filed November 30, 1987.
This invention relates to a method of constructing a storage container and apparatus for con~tructing the container.
There is a continuing interest in the safe ~ 10 containment of liquids, particularly gasoline and other fuels, because of the vast amount of fuel presently stored throughout the country. It has become increasingly apparent that underground storage tanks can and do leak, thus causing serious short-term and long-term problems. Therefore, many localities have chosen to examine all underground tanks, mostly fuel storage tanks, to determine if the tanks are leaking. It is an expensive process to inspect the tanks and test the earth surrounding the tanks for indications of ~ leakage. Repair or replacement of tanks which are shown to `~ 20 be leakin~ increa~es the cost a great deal further.
To aid the detection and prevention of leaks, double wall ~dual containment) tanks have been used for both -~ underground and above ground storage. The space between the two walls of the tanks i8 monitored for leakage. When used underground, nitors can be used to sense both water seepage in and stored liquid seepage out. If a leak is detected, the tank can be drained and abandoned, dug up and removed, or repaired in place. These options are all quite expensive. If the contaminated soil surrounding the leaking tank must be removed, the expense increases dramatically.
However, conventional double wall tanks are quite expensive ~ and are not presently able to meet fire code ~tandards for `` above-ground storage of flammable liquids. Therefore, even `` when dual containment tanks are u#ed, flammable liquid is ; 35 most o~ten stored in below-ground tanks~
Creating a concrete encased hollow tank is not without problems. One conventional method of doing ~r.
.
. :
~' ` :
. ; -...... . ~ , ~
so is to form an open-top hollow shell, place the tank within the hollow shell and then pour the top. However, this process creates cold joints which are po~sible sources of lea~s and weak points in the structure. Therefore, a homogeneous concrete shell, which would eliminate cold joints, would be preferable. Entombing a hollow tank in fluid concrete is hindered~ if not prevented by the fact that the hollow tank has a tendency to bob up or float within the fluid concrete. Although the tank could be filled with water to give it neutral buoyancy, this solution causes other problems, including difficulties arising from trying to remove all the water from the tank after the concrete has set.
In a first aspect the present invention provides a `~ 15 method for entombing a container within a homogeneous layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastenin~ the wall forms to one another to create a sidewall form:
positioning the sidewall form relative to the base plate wherein the positioning of the sidewall creates an open top enclosure bounded by the base plate and the ~5 sidewall form:
pouring a first portion of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
lowering the containèr into the enclosure until the container re~t~ on the bottom layer of concrete to define a region within the enclosure 4urrounding at least a portion of the container;
vertically re~training the container within the enclosure, such that the container contacts the bottom layer of concrete subse~uent pouring of concrete;
pouring a ~econd portion of concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom ' .,., ~ , :, , layer of concrete wherein the fir~t portion of concrete and the second portion of concrete form a homogeneous entombing layer of concrete about the vertically restrained container:
allowing the homogeneous layer of concrete to set:
and ` removing the wall forms and the base plate from the concrete encased container.
- In a second aspect, the present invention provides a method for entombing a container within a homogeneous - 10 layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastening the wall forms to one another to create :i 15 a sidewall form;
positioning the sidewall form relative to the base plate wherein said positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form:
2~ pouring a layer of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
- lowering the container into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container;
vertically restraining the container within the enclosure, such that the container contacts the bottom layer of concrete during subsequent pouring of concrete;
wherein the vertically restraining step includes " 30 the steps of;
positioning a hold-down member over the open top of the container so as to overlie the container;
connecting the hold-down member against the top of ` the container;
: 35 pouring concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete to .
, ., - , . .
,.................................... , , . :
_ 4 _ ~ 1 3 26 1 3 9 form a homogeneous entombing layer of concrete about the vertically restrained container;
allowing the concrete to set; and removing the wall forms and the base plate from the concrete encased container.
The present invention also provides an apparatus for encasing a tank in a homogeneous layer of - concrete comprising:
a base plate;
wall forms combinable to create a circumferential ~idewall form;
means for securing the wall forms to one another;
means for laterally positioning the sidewall form on the base plate, the sidewall form and base plate defining an enclosure;
a hold-down member having a tank engaging element;
means for mounting the hold-down member over the enclosure, the tank engaging member adapted to engage a tank within the enclosure; and means, coupled to the base plate, for forcing the hold-down member a~ainst the tank to counteract any upward buoyant force of the tank caused when concrete is poured into a portion of the enclosure surrounding the tank.
Other features and advantages of the invention will appear from the following description in which the preferred embodiments have been set forth in detail in conjunction with the accompanied drawings.
Fig. 1 is a side cross-sectional view showing a vault made according to the present invention.
.. ~
., , ., , ' .
~ 1326139 Fig. 2 is an exploded cross-sectional view taken along line 2-2 of Fig. 1.
Fig. 3 is a schematic illustration showing a method for making the vault of Fig. 1.
Fig. 4 shows the inner tank of Figs. 1-3 within the form assembly of Fig. 3.
Fig. 5 illustrates the internal reinforcing members of the inner tank of Fig. 4 allowing the tank to be used as a pressure vessel.
:`
:
.
.
~ ' . ' ' '; - .: - ' . . ' . , ... . . .
.. .~ .
Referring now to Figs. 1 and 2, a vault is shown to include a steel inner tank 4 surrounded by a spacer layer 6 of polystyrene. Inner tank 4 and spacer layer 6 are entombed or encased within an outer tank 8. Outer tank 8 includes a concrete layer 10 strengthened by rebar 12, and a liquid impervious liner 14, preferably by a sheet of ; polyurethane film. Conventional fill and vent pipes 16 ` extend from inner tank 4. A leak detector tube 20 is - positioned between inner tank 4 and liner 14 and terminates at a liquid collection region 22. Tube 20 permits leaks from inner tank 4 to be monitored as the leaking liquid collects within region 22.
spacer layer 6 performs a dual function. Spacer layer 6 is a good thermal insulator so to insulate the - 15 contents of inner tank 4 from external heat sources, such as forest fires. In addition, spacer layer 6 helps keep the contents of inner tank 4 at a more uniform temperature than would otherwise exist. This helps reduce vapour pressures j within inner tank 4 making the storage of liquids safer and reducing the potential for vapour leaks to the atmosphere.
In addition, spacer layer 6 is chosen so that it melts or liquifies when the liguid within inner tank 4 contacts the ` material of the spacer layer. Typically, inner tank 4 will hold a liquid hydrocarbon fuel, such as gasoline or diesel - 25 fuel. By choosing a spacer layer 6 made of polystyrene, if the liguid within tank 4 leaks throu~h and contacts spacer layer 6, poly~tyrene spacer layer 6 melts or dis~olves thus creating an open region between inner tank 4 and outer tank 8 permitting the leaked hydrocarbon to collect at liquid collection region 22. This permits the leak to be guickly noticed through leak detector tube 20 using conventional methods.
As a further aid to detection of leaks, outer tank 8 includes bottom supports 24 which raise the bottom 26 of ` 35 vault 2 above the support surface 28 to create an inspection region 30 between bottom 26 and support surface 28. If . , , -. ` .
' :
. ; - ~ ` ' _ 7 _ 1 326 1 39 desired support surface 28 can be covered with a sheet or layer to aid visual inspection of leaks.
Turning now also to Fig. 3, a simplified view of the method for makin~ vault 2 is shown. First, an appropriate inner tank 4 is selected and has a number of polystyrene panels 32 secured to the outer surface 34 of inner tank 4, typically by an adhesive. A large sheet 36 of ; a liquid impervious material, such as polyethylene film, is ` wrapped around the spacer layer encased inner tank. The edges 38 of sheet 36 are gathered over the top 40 of inner tank 4 so to create a second liquid barrier.
A concrete form assembly 42 is used to entomb the inner tank 4, spacer layer 6, liner 14 combination. Form assembly ~2 includes a base plate 44, having a pair of openings 46, used to form bottom supports 24, and two L-shaped wall forms 48, 50~ Wall forms 48, 50 constitute a sidewall form 51. After assembly of base plate 44 and wall forms 48, 50, a rebar ca~e 52 is placed within an enclosure 54 defined by wall forms 48, 50 and base plate 44. A layer 56 of concrete is then poured within enclosure 54 to cover base plate 44. The combination 58 of inner tank 4, spacer layer 6 and sheet 36, which creates liner 14, is then positioned within enclosure 54 on top of the still wet layer 56 of concrete. Additional concrete is then placed within ` 25 the region 60, see Fig. 4, between combination 58 and wall forms 48, 50 sufficient to cover combination 50 and be gen-erally level with top edge 62 of sidewall form 51. The specific construction of form assembly 42 will now be discussed with reference to Fig. 4, in particular the Qtructure for keeping combination 58 from bobbing up out of the fluid concrete.
Form assembly 42, in addition to wall forms 48, 50 and base plate 44, includes a pair of form clamp assemblie~
~ 64 at opposite corners 66, 68 of sidewall form 51, a lateral -` 35 positioning assembly 70 adjacent base plate 44 and a pair of hold-down assemblies 72 which keep inner tank 4 from floating within the concrete while it is fluid.
.
: .............................. , . ... , . .. .. . - i . ., , ,.,.,., ,.. ", .... ..
.."
- . ,, '. ~.. ,~,.,~ ' ;.. . .... ..
;~. . , t :. .. ..
Clamp assemblies 64 each include an L-bracket 73.
welded to sidewall form 51, and a chain 74, secured at one end to L-bracket 73 by an adju~tment bolt 76. Chain 74 has a hook 78 at the other end which engages the corner of the adjacent wall form 48 or S0. Chain 74 is tightened using a ; chain binder 80 which allows the user to easi~y apply a strong clamping load on the two wall forms 48, 50.
Adjustment bolt 76 can be used to provide any necessary fine adjustment to the tension in chain 74. It has been found that use of two L-shaped wall forms 48, 50 and four form clamp assemblies 64 allow wall form 50 to be easily but securely fastened to~ether while ensuring the proper, in this rectangular, shape is maintained.
Lateral positioning assemblies ?0 each include a jack block 82 welded to base plate 44 at a position spaced ~ apart from wall forms ~8. 50. A hydraulic jack 84 is - mounted between each jack block 82 and the opposing side of wall forms 48, 50. Applying sufficient force on wall forms 48, 50 through the use of jacks 84 positions sidewall form 51 on base plate 44 and keeps the lower ends of sidewall form 51 from moving laterally outwardly due to the pressure of the concrete while it is still fluid.
Each hold-down assembly 72 includes an elongate hold-down bar 86 having chamfered ends 88 guided between ~ertical guide plates gO. Guide plates 90 are mounted to wall forms 48, 50 and extend above top edge 62. Hold-down bar 86 has a pair of downwardly extending hold-down tubes 92 depending from its bottom surface 94 and a strong back 96 mounted centrally above the top surface 102 of hold-down bar 86. Strong back 96 has an arauate guide surface 98 and a pair of vertical guide plates 100. Hold-down assembly 72 includes a chain 104 having each end 106 secured to an anchor point 108 on jack block 82. Chain 104 passes from the jack block 82 on one side of form assembly 42, between vertical guide~ 90, across chamfered ends 88, over curved ~urface 98 of strong back 96 and down past the chamfered ends of holddown bar 86 on the other side. Hold-down assembly 72, also includes a chain ratchet 110. Chain ; ~ .
~ .
.:
... . . . .
~, : -. . ~ . , ~ 1326139 g ratchet 110 is used to shorten the effective of length of chain 104 thus forcing tubes 92 a~ainst the top 112 of inner tank 4.
Guide rings 114, each having an internal diameter slightly larger than the external diameter of tuhes 92, are welded to top 112 at positions chosen to engage the lower ends of tubes 9? , Once so engaged, lateral, as well as upward, movement of inner tank 4 within enclosure 54 is substantially eliminated.
Strong back 96 is used to strengthen hold-down assembly 72. Strong back 96 keeps hold-down bar 86 from bowing upwardly due to the upward force on the hold-down bar caused by tank 4 attempting to float when surrounded by fluid concrete~
Turning now to Fig. 5, an inner tank 4, is shown to include U-channel reinforcing members 13n welded to the inside surface 13~ of inner tank 4, so that inner tank 4, may be used as a pressure vessel. Reinforcing members 130 form a number of hoops 134 circumscribing the interior of `~`v 20 tank 4. The ends 136 of inner tank 4, have vertically : extending reinforcing members 130 mounted along their interior surfaces as well. Pairs of reinforcing members 130 are placed back to back at positions 138 along top 112 of inner tank 4, and at poæitions 140 along the bottom 142 of inner tank ~. This provides extra strength along the central portion of tank 4. A pair of lifting brackets 144 are welded to top 112 of tank 4, adjacent positions 138 to facilitate moving tank 4.
A vault 2 made with an inner tank 4, can be used as a vacuum storage vessel to safely handle waste motor oil or crank case motor oil. The vault incorpora~ing reinforced inner tank 4 could have a vacuum continuously applied to the inner interior of inner tank 4. A hose ~not shown) would then be used to connect inner tank 4, to the oil, or other liquid, to be disposed of. The waste oil so collected could then periodically be removed from the vault through the use of, for example, a mobile vacuum tank truck which can suck the waste oil directly out of the inner tank 4, and into the ~ 132613q mobile tank. This would permit gasoline service stations.
~- auto dealers, lube and oil change centers, among others, to safely and conveniently store the waste oil and grease in a safe, cost-effective manner. Even without creating a vacuum 5 in the interior of a vault 2, vault 2 would still be useful for safely and inexpensively storing such waste oil, waste grease and other flammable materials, by pumping or pouring the waste material directly into the vault.
; To use form assembly 42, base plate 44 is 10 positioned on a, preferably, level support surface. Wall forms 48, 50 are positioned on base plate 44 and are ` fastened to one another by form clamp assemblies 64 at each < corner 66, 68. Hydraulic jacks 84 are then operated to properly position sidewall form 51 on base plate 44 and keep 15 the bottom of the sidewalls from kicking out due to the pressure of the fluid concrete. Rebar cage 52 is then placed within enclosure 54 and a layer 56 of concrete is poured into enclosure 54 to create bottom 26 of outer tank 8. Combination 58, see Fig. 3, is then lowered into 20 enclosure 54 until it rests on layer 56 of concrete.
Hold-down bars 86 are then positioned over enclosure 54 and lower ends of tubes 92 are positioned within rings 114. Chains 104 are then placed over hold-down bar 86 and fastened to jack blocks 82 at anchor points 108.
Chain ratchets 110 are used to tighten chains 104 sufficiently to place an appropriate force on hold-down bars 86. Concrete is then poured into enclosure 54 to entomb combination 58, with the exception of various fill and vent pipes 16 extending up through concrete outer tank 8. Note that layer 56 of concrete is still wet when the subsequent ~` pour of concrete is made. This ensures a homogeneous concrete layer 10 with no cold joints. Sidewall form 51 is then vibrated to settle the aggregate in the concrete. The top surface 120 of outer tank 8 is smoothed~ Shear pins 122 can be used to keep hold-down bars 86 from moving upwardly past upper holes 124 in vertical guides 90.
Once the concrete has set sufficiently, chain ratchets 110 are actuated to loosen chains 104 shear pins ~` . . - . .
- . -~
122 are removed from holes 124 and hold-down bars 86 are - lifted upwardly to remove tubes 92 from the layer of concrete covering top 112 of inner tank 4. ~he holes left by removal of tubes 92 are filled with fresh concrete.
`- 5 After the concrete has cured sufficiently, sidewall form 51 ~ is removed from vault 2 and vault 2 is separated from base -~ plate 44.
`~ Modification and variation can be made to the disclosed embodiments without departing from the subject of the invention as defined by the following claims. If desired, non-flamm~ble liquids can be stored in vault 2.
Although it is preferred to include rebar cage 52 as a part of outer tank 8, one need not necessarily do so. Inner tank ~:.
4, although in the preferred embodiment made of steel could be made of other suitable material according to the particular liquid being contained and the environment. It is preferred that vault 2 have a flat bottom for stability.
However, other shapes are also possible. Vertical force can .~ be applied to inner tank 4 during curing of the concrete in ways not shown. For example, tubes 92 could be replaced by I-beams permanently mounted to inner tank 4 and left within concrete top 126. Also, by appropriately positioning fill and vent pipes 16, the tops of these pipes may be used to apply the necessary vertical force on inner tank 4 to keep the inner tank from floating before the concrete has set.
One or both of chain binders 80 and chain ratchets 110 may be replaced by other suitable tightenin~ devices, such as hydraulic push-pull jacks.
~`
~.
. .
.
Claims
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A method for entombing a container within a homogeneous layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastening the wall forms to one another to create a sidewall form;
positioning the sidewall form relative to the base plate wherein the positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form;
pouring a first portion of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
lowering the container into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container;
vertically restraining the container within the enclosure, such that the container contacts the bottom layer of concrete subsequent pouring of concrete;
pouring a second portion of concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete wherein the first portion of concrete and the second portion of concrete form a homogeneous entombing layer of concrete about the vertically restrained container;
allowing the homogeneous layer of concrete to set;
and removing the wall forms and the base plate from the concrete encased container.
2. A method for entombing a container within a homogeneous layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastening the wall forms to one another to create a sidewall form;
positioning the sidewall form relative to the base plate wherein said positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form;
pouring a layer of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
lowering the container into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container;
vertically restraining the container within the enclosure, such that the container contacts the bottom layer of concrete during subsequent pouring of concrete;
wherein the vertically restraining step includes the steps of;
positioning a hold-down member over the open top of the container so as to overlie the container;
connecting the hold-down member against the top of the container;
pouring concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete to form a homogeneous entombing layer of concrete about the vertically restrained container;
allowing the concrete to set; and removing the wall forms and the base plate from the concrete encased container.
3. The method of claim 2 further comprising the step of releasing the hold-down member from the container after the concrete is no longer fluid.
4. The method of claim 1 wherein the step of positioning the wall forms is carried out by positioning two wall forms on the base plate.
5. The method of claim 1 wherein the fastening step is carried out using a chain binder.
6. The method of claim 1 wherein the step of positioning the sidewall form is carried out using jacks.
7. The method of claim 2 wherein the connecting step includes the steps of running a flexible member over the hold-down member and connecting the flexible member to the base plate on opposite sides of the sidewall form.
8. The method of claim 7 wherein the forcing step is carried out by placing the flexible member in tension.
9. The method of claim 1 wherein the selecting step includes the step of selecting a tank enclosed within a liquid impervious liner.
10. The method of claim 9 wherein the selecting step includes the step of selecting a tank having an outer surface covered with a spacer layer, the spacer layer and tank being within the liner.
11. The method of claim 1 further comprising providing a spacer layer adjacent to at least a portion of the container, wherein the spacer layer comprises material which is liquefiable upon contact with a chosen liquid to be stored within the container.
12. The method claim 1 further comprising the step of positioning concrete reinforcing members in the region of the enclosure surrounding the container.
13. The method of claim 1 further comprising the step of vibrating the sidewall form after the step of pouring the second portion of concrete.
14. The method of claim l wherein the container selecting step includes the step of choosing a rectangular container.
15. The method of claim 14, wherein the choosing step is carried out by choosing a container having reinforcing ribs to strengthen the container against deformation when the container is pressurized.
16. Apparatus for encasing a tank in a homogeneous layer of concrete comprising:
a base plate;
wall forms combinable to create a circumferential sidewall form;
means for securing the wall forms to one another;
means for laterally positioning the sidewall form on the base plate, the sidewall form and base plate defining an enclosure;
a hold-down member having a tank engaging element;
means for mounting the hold-down member over the enclosure, the tank engaging member adapted to engage a tank within the enclosure; and means, coupled to the base plate, for forcing the hold-down member against the tank to counteract any upward buoyant force of the tank caused when concrete is poured into a portion of the enclosure surrounding the tank.
17. The apparatus of claim 16 wherein the sidewall form is rectangular.
18. The apparatus of claim 16 wherein the wall forms number two.
19. The apparatus of claim 16 wherein the securing means includes a chain binder arrangement.
20. The apparatus of claim 16 wherein the laterally positioning means includes a jack mounted between a jack block, secured to the base plate, and the sidewall form.
21. The apparatus of claim 16 wherein the hold-down element includes an elongate bar with a strongback reinforcing member on an upper surface of the bar, the bar having ends at opposite sides of the sidewall form, the strongback strengthening the bar against upward bending caused by any buoyant force of the tank while the concrete is fluid.
22. The apparatus of claim 21 wherein the forcing means includes chain means having a first end connected to the base plate at a first point, length passing over the bar and over the strongback and a second end connected to the base plate at a second point.
23. The apparatus of claim 22 wherein the forcing means includes means for tightening the chain.
24. The apparatus of claim 16 wherein the mounting means includes vertical guides mounted to the sidewall form and between which hold-down member moves, and pin means for limiting the upward movement of the hold-down member within the vertical guides.
25. The apparatus of claim 16 wherein the tank engaging element is permanently fastened to an elongate bar.
26. The apparatus of claim 16 further comprising a positioner secured to the tank for locating and positioning the tank engaging element.
27. The apparatus of claim 16 including a plurality of hold-down elements.
1. A method for entombing a container within a homogeneous layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastening the wall forms to one another to create a sidewall form;
positioning the sidewall form relative to the base plate wherein the positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form;
pouring a first portion of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
lowering the container into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container;
vertically restraining the container within the enclosure, such that the container contacts the bottom layer of concrete subsequent pouring of concrete;
pouring a second portion of concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete wherein the first portion of concrete and the second portion of concrete form a homogeneous entombing layer of concrete about the vertically restrained container;
allowing the homogeneous layer of concrete to set;
and removing the wall forms and the base plate from the concrete encased container.
2. A method for entombing a container within a homogeneous layer of concrete comprising the following steps:
selecting a container having a container top;
placing a base plate on a support surface;
positioning wall forms on the base plate;
fastening the wall forms to one another to create a sidewall form;
positioning the sidewall form relative to the base plate wherein said positioning of the sidewall creates an open top enclosure bounded by the base plate and the sidewall form;
pouring a layer of concrete onto the base plate to form a bottom layer of concrete in the enclosure;
lowering the container into the enclosure until the container rests on the bottom layer of concrete to define a region within the enclosure surrounding at least a portion of the container;
vertically restraining the container within the enclosure, such that the container contacts the bottom layer of concrete during subsequent pouring of concrete;
wherein the vertically restraining step includes the steps of;
positioning a hold-down member over the open top of the container so as to overlie the container;
connecting the hold-down member against the top of the container;
pouring concrete into the enclosure in the region surrounding the container to contact the bottom layer of concrete before setting of the bottom layer of concrete to form a homogeneous entombing layer of concrete about the vertically restrained container;
allowing the concrete to set; and removing the wall forms and the base plate from the concrete encased container.
3. The method of claim 2 further comprising the step of releasing the hold-down member from the container after the concrete is no longer fluid.
4. The method of claim 1 wherein the step of positioning the wall forms is carried out by positioning two wall forms on the base plate.
5. The method of claim 1 wherein the fastening step is carried out using a chain binder.
6. The method of claim 1 wherein the step of positioning the sidewall form is carried out using jacks.
7. The method of claim 2 wherein the connecting step includes the steps of running a flexible member over the hold-down member and connecting the flexible member to the base plate on opposite sides of the sidewall form.
8. The method of claim 7 wherein the forcing step is carried out by placing the flexible member in tension.
9. The method of claim 1 wherein the selecting step includes the step of selecting a tank enclosed within a liquid impervious liner.
10. The method of claim 9 wherein the selecting step includes the step of selecting a tank having an outer surface covered with a spacer layer, the spacer layer and tank being within the liner.
11. The method of claim 1 further comprising providing a spacer layer adjacent to at least a portion of the container, wherein the spacer layer comprises material which is liquefiable upon contact with a chosen liquid to be stored within the container.
12. The method claim 1 further comprising the step of positioning concrete reinforcing members in the region of the enclosure surrounding the container.
13. The method of claim 1 further comprising the step of vibrating the sidewall form after the step of pouring the second portion of concrete.
14. The method of claim l wherein the container selecting step includes the step of choosing a rectangular container.
15. The method of claim 14, wherein the choosing step is carried out by choosing a container having reinforcing ribs to strengthen the container against deformation when the container is pressurized.
16. Apparatus for encasing a tank in a homogeneous layer of concrete comprising:
a base plate;
wall forms combinable to create a circumferential sidewall form;
means for securing the wall forms to one another;
means for laterally positioning the sidewall form on the base plate, the sidewall form and base plate defining an enclosure;
a hold-down member having a tank engaging element;
means for mounting the hold-down member over the enclosure, the tank engaging member adapted to engage a tank within the enclosure; and means, coupled to the base plate, for forcing the hold-down member against the tank to counteract any upward buoyant force of the tank caused when concrete is poured into a portion of the enclosure surrounding the tank.
17. The apparatus of claim 16 wherein the sidewall form is rectangular.
18. The apparatus of claim 16 wherein the wall forms number two.
19. The apparatus of claim 16 wherein the securing means includes a chain binder arrangement.
20. The apparatus of claim 16 wherein the laterally positioning means includes a jack mounted between a jack block, secured to the base plate, and the sidewall form.
21. The apparatus of claim 16 wherein the hold-down element includes an elongate bar with a strongback reinforcing member on an upper surface of the bar, the bar having ends at opposite sides of the sidewall form, the strongback strengthening the bar against upward bending caused by any buoyant force of the tank while the concrete is fluid.
22. The apparatus of claim 21 wherein the forcing means includes chain means having a first end connected to the base plate at a first point, length passing over the bar and over the strongback and a second end connected to the base plate at a second point.
23. The apparatus of claim 22 wherein the forcing means includes means for tightening the chain.
24. The apparatus of claim 16 wherein the mounting means includes vertical guides mounted to the sidewall form and between which hold-down member moves, and pin means for limiting the upward movement of the hold-down member within the vertical guides.
25. The apparatus of claim 16 wherein the tank engaging element is permanently fastened to an elongate bar.
26. The apparatus of claim 16 further comprising a positioner secured to the tank for locating and positioning the tank engaging element.
27. The apparatus of claim 16 including a plurality of hold-down elements.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000616224A CA1326139C (en) | 1986-12-01 | 1991-11-12 | Storage vault and method |
| CA000616536A CA1330264C (en) | 1986-12-01 | 1992-11-20 | Storage vault and method |
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93620586A | 1986-12-01 | 1986-12-01 | |
| US936,205 | 1986-12-01 | ||
| US11891887A | 1987-11-16 | 1987-11-16 | |
| US07/118,919 US4826644A (en) | 1986-12-01 | 1987-11-16 | Method for entombment of tanks in concrete |
| US118,918 | 1987-11-16 | ||
| US118,919 | 1987-11-16 | ||
| CA000553174A CA1296154C (en) | 1986-12-01 | 1987-11-30 | Storage vault and method |
| CA000616224A CA1326139C (en) | 1986-12-01 | 1991-11-12 | Storage vault and method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000553174A Division CA1296154C (en) | 1986-12-01 | 1987-11-30 | Storage vault and method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616536A Division CA1330264C (en) | 1986-12-01 | 1992-11-20 | Storage vault and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1326139C true CA1326139C (en) | 1994-01-18 |
Family
ID=27426506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616224A Expired - Lifetime CA1326139C (en) | 1986-12-01 | 1991-11-12 | Storage vault and method |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1326139C (en) |
-
1991
- 1991-11-12 CA CA000616224A patent/CA1326139C/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4826644A (en) | Method for entombment of tanks in concrete | |
| US4934122A (en) | Storage vault and method | |
| US4963082A (en) | Apparatus for entombment of tanks in concrete | |
| US6422413B1 (en) | Tank vault | |
| US5282546A (en) | Composite above ground liquid storage vault | |
| US5157888A (en) | Storage vault and method for manufacture | |
| US4961293A (en) | Precast, prestressed concrete secondary containment vault | |
| US5037239A (en) | Underground concrete vault structure for hazardous liquid storage tanks | |
| US5271493A (en) | Tank vault | |
| US5881760A (en) | Modular steel tank with casting wall | |
| US5232119A (en) | Multi-walled pipes and storage tanks for toxic and corrosive fluids | |
| US5174079A (en) | Fluid containment vault with homogeneous concrete-entombed tank | |
| US5769109A (en) | Storage vault with overflow containment collar | |
| US5273180A (en) | Liquid storage tank leakage containment system | |
| US4934866A (en) | Secondary fluid containment method and apparatus | |
| US5601204A (en) | Tank vault with sealed liner | |
| JPH02287198A (en) | Bolt apparatus for radioactive waste disposal and waste disposal method | |
| US4317317A (en) | Liquid storage tank | |
| US5234191A (en) | Apparatus for forming a fluid containment vault | |
| WO1992006010A1 (en) | Above ground hazardous liquid storage apparatus | |
| US5372772A (en) | Method for entombment of container in concrete | |
| US5752617A (en) | Material holding tank with dike and skirt | |
| US3690110A (en) | Repairing or rehabilitating steel supported h-piles | |
| US5126095A (en) | Method for encasing a storage tank in concrete | |
| US5308423A (en) | Method of making multi-walled pipes and storage tanks for toxic and corrosive fluids |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |
Effective date: 20110118 |