CA1231541A - Apparatus for constructing underground fluid barrier - Google Patents
Apparatus for constructing underground fluid barrierInfo
- Publication number
- CA1231541A CA1231541A CA000525269A CA525269A CA1231541A CA 1231541 A CA1231541 A CA 1231541A CA 000525269 A CA000525269 A CA 000525269A CA 525269 A CA525269 A CA 525269A CA 1231541 A CA1231541 A CA 1231541A
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- Canada
- Prior art keywords
- panel
- plastic
- high density
- constructing
- fluid barrier
- 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.)
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Abstract
ENVIRONMENTAL CUT-OFF FOR DEEP EXCAVATIONS
ABSTRACT OF THE DISCLOSURE
High density polyethylene sheets are installed in panel forms to form an impervious barrier to fluid flow particularly corrosive contaminates and pollutants. A
slit is excavated in the earth under a bentonite slurry to the required depth. A relatively thick, high density poly-ethylene sheet is placed in the trench and connected to two high density polyethylene pipes or channel members, the with of which, in the direction transverse to the direc-tion of the wall, is the width of the trench. The panel length typically will be 15 to 30 feet. Once the high den-sity polyethylene panel is installed, the slurry is dis-placed on both sides by a backfill material that can be a soil-bentonite, cement-bentonite or concrete. A secondary panel section intermediate two previously formed primary panels is made using a secondary panel of high density poly-ethylene similarly constructed but using smaller diameter pipe or channel members than the primary panel pipes. This panel is then lifted and the two smaller pipes or channels lowered into the primary panel pipes or channels with the high density polyethylene panel extending between through two slots or openings in facing primary panel pipe or channel elements. A non-shrinking grout is then pumped into the pipe connection to form a tight joint.
ABSTRACT OF THE DISCLOSURE
High density polyethylene sheets are installed in panel forms to form an impervious barrier to fluid flow particularly corrosive contaminates and pollutants. A
slit is excavated in the earth under a bentonite slurry to the required depth. A relatively thick, high density poly-ethylene sheet is placed in the trench and connected to two high density polyethylene pipes or channel members, the with of which, in the direction transverse to the direc-tion of the wall, is the width of the trench. The panel length typically will be 15 to 30 feet. Once the high den-sity polyethylene panel is installed, the slurry is dis-placed on both sides by a backfill material that can be a soil-bentonite, cement-bentonite or concrete. A secondary panel section intermediate two previously formed primary panels is made using a secondary panel of high density poly-ethylene similarly constructed but using smaller diameter pipe or channel members than the primary panel pipes. This panel is then lifted and the two smaller pipes or channels lowered into the primary panel pipes or channels with the high density polyethylene panel extending between through two slots or openings in facing primary panel pipe or channel elements. A non-shrinking grout is then pumped into the pipe connection to form a tight joint.
Description
~3~L5~
This invention relates to an apparatus for con-strutting a deep underground fluid barrier, such as an underground pollution control barrier.
This application is a division of cop ending Canadian Patent Application 447,968, filed on February 21, 1984.
The formation of underground impermeable barriers using slurry trench techniques has been widely developed in recent years and in a number of instances, attempts to utilize impervious plastic or rubber sheets to form impermeable barriers in such cut-off walls has been attempted. In Ryan US. patent 2,048,710, a pair of lining materials such as fabric or paper or other lining material which has been treated so that the lining material acts as a separator or divider between the earth material and the wall material after the wall material has been placed in the trench. In Zakiewicz US. Patent 3,603,099, an intraground water proof baffle is disclosed in which the roll of flexible water proof plastic foil is displaced along the line of the excavation so that as the trench is cut, the foil is lazed in a vertical plane behind the excavator and then the space between the foil and the sides thereof is filled with a wall forming material.
In Piccagli US. Patent 4,193,716 and Cannon et at US. Patent 3,759,044, plastic sheets are embedded in diaphragm walls. These processes and structures are not amenable to the placement of such synthetic plastic materials in deep excavation using the slurry wall construction technique. In Russ Canadian applique-lion Serial No. 400,763, assigned to the assignee hereof, a plastic sheath or envelope is provided in which the wall forming material is in the sheath or envelope.
One aspect of the invention resides in an apparatus for constructing a deep underground fluid barrier in an elongated slot excavated in the earth, the apparatus including a pair of vertical, spaced apart rigid plastic coupling members having mutually facing first surfaces and oppositely facing second surfaces. A plastic sheet spans the space between the first surfaces, the plastic sheet having lateral ends which are sealingly coupled to the mutually lacing first surfaces of the plastic coupling members. Means forms a slot in each of the oppositely facing surfaces of the plastic coupling members.
In the illustrated embodiment of the invention the apparatus further includes first and second spaced apart vertical rigid plastic secondary members, the first and secondary rigid plastic members having mutually facing third and fourth surfaces, respectively. A plastic sheet spans the space between the mutually facing third and fourth surfaces and has lateral ends which are sealingly joined to the facing third and fourth surfaces, respectively. Each spaced apart rigid plastic secondary member is of a size as to be telescopically received in one of the first named pair of spaced apart coupling members, with the secondary flexible plastic sheet passing through the means forming the slot in the plastic coupling members.
The above described apparatus is designed for use in a pollution control barrier which includes a narrow slot excavated in the earth using the bentonite slurry technique as disclosed in Vender US. Patent 3,310,952, such that the earthen walls are impregnated with bentonite and a bentonite cake is formed on the surfaces thereof. These plastic sheets are inserted in the slot and, preferably, are aligned with the center of the slot and a wall forming material fills the slot on both sides owe the plastic sheets.
More specifically, the present invention is in the form of plastic sheets which may be considered to be divided into primary and second panel sections, the lateral ends of the primary panel sections of the plastic sheet being sealingly secured to facing surfaces of pairs of spaced apart primary plastic tubular members. The pairs of spaced apart primary plastic tubular members have slots in surfaces opposite the surfaces to which the lateral ends have been sealingly secured, and the members have a dimension and a direction transverse to the length of the narrow trench at least equal to the width of the narrow trench to form primary panel elements. The lateral ends of the secondary panel sections of plastic sheet are sealingly secured to the facing surfaces of a pelf of secondary rigid plastic ~3~L54~
members so as to form secondary panel elements. At least a pair of the primary panel elements as formed in the manner described above, are inserted islet the slurry filled trench in spaced apart relation with the slots in the primary tubular members of the pair of primary panel sections facing each other. The slurry is displaced from the narrow trench between each of the pair of spaced apart primary tubular members with a backfill material, the spaced apart tubular members serving as end stops for the backfill materials. One of the secondary panel elements is inserted between the inserted pair of primary panel elements with the secondary tubular member telescoping within the spaced bounded by the primary tubular elements, the plastic panel section passing through the slots respectively. The remaining space between the primary plastic tubular members and secondary rigid plastic members and bounded by the primary tubular members is sealingly filled.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, advantages and features of the invention will become more readily apparent from the accompanying drawings in which:
Figure 1 is a top plan view of an underground poll-lion control barrier including the apparatus of the present nventlon;
Figure 2 is an elevation Al view of the construction shown in Figure 1, Figure 3 is an enlarged view of a joint according to the invention, Figure 4 is a top plan view of a modification of the invention and, Figure 5 is a top plan view of a further modifica-lion of the invention.
I
Referring now to Figs. 1, 2 and 3, the primary panel sections Pi, P2...PN are formed in excavations which are carried out under a bentonite slurry to a depth D which is at least down to the level below which any expected pollutant may be found or expected to flow and typically is down to the water table and in panel lengths typically of 15 to 30 feet. A pair of high density polyethylene pipes or tubular channel members 10 and 11 having diameters equal to the width W of the trench section is connected by a high density polyethylene sheet 12 which, in this example, is about 100 mills thick, but which obviously can be of greater or lesser thicknesses and of any other plastic material having appropriate chemical and mechanical properties. The lateral ends 13 and 14 of high density polyp ethylene sheet 12 are bonded to the external surfaces of high density polyethylene pipes 10 and 11 in an impervious fluid type manner by mob/
Ed electronic or chemical welding, fusion or joining and sealing all of which are conventional. Single high den-sty polyethylene sheet 12 may be composed of several sheets which are musingly joined or bonded at their edges to for the desired barrier but in the preferred embody-mint, it is a single integrally formed sheet so as to assure thaw there are no leaks in the sheet. Plastic sheet 12 is joined to pipes 10 and if at lateral edges 13 and 14 prior to insertion of same into the excavated trench.
Once the panel section is set, the bentonite slurry on each side of sheet 12 is displaced by a backfill which can be a mixture of soil-bentonite, cement-bentonite or concrete, etc. As shown in connection with the filling of secondary panel section Sly the backfill is accomplished by the trim pipe technique whereby the backfill material its hydraulically intro Cal into ho excnv~i.on on Boyle sides of the sheet by hollow steel tubes 16-17 which are gradually raised so that their lower ends remains within the heaps 18 of backfill material on both sides of sheet 12 so that there is no differential backfill loading applied to the sheet. The lower ends of the tubes remain within the backfill heap 20 and the slowing rising heap of backfill material rises upwardly and the amount of bentonite which is in the excavation there above is displaced and removed for storage for use in other excavating operations. The opera-lion is terminated when the backfill material reaches the surface of the ground. A clay or concrete cap or cover may be applied at the surface of the wall.
In accordance with the technique disclosed in this preferred embodiment, the length of the secondary panel So is omitted and another primary panel Pi is installed lot-lowing the procedure described above.
I
The pipes 10 and 11 have wall thicknesses ox 3/4 to 1 inch. They may be cast or extruded, with or without no-enforcement fibers, etc.
It will be appreciated that the primary excavations can be made using any conventional slurry Ryan exc~v~l~ion technique such as a clam shell, rotary drill bits and even bucked in the shallower depth walls. moreover the trench excavations can be made in panel sections or as a continuous length trench in which the excavation is formed and main-10 aliened in a ben~onite slurry and iris a least two primary panel sections Pi and Pi are installed and backfilled Jo form table structures and then the intervening secondary panel So is installed between two primary panel elements Pi, Pi.
In installing the secondary panel element Sly a second defy panel of high density polyethylene sheet 22 has its lateral ends 23 and I secured to smaller dynamiter high (fell sty polyethylene rods, pipes, tubes I and 27, respectively, the facing surfaces of the larger diameter polyethylene pipes 10 and 11 have full length slits or slots in the surfaces, thereof facing the excavation for the secondary panel eye-mint Sly These slits or slots 30, 31 are made at least large enough so that they can easily accomoda~e the thickness of the high density polyethylene sheets 22, the edges of the lips or slots being smooth and rounded without sharp edges 90 as to avoid damaging the plastic sheet. This panel section it then lifted and the two smaller diameter pipes 26, 27 are lowered or telescoped into the larger diameter pipes 10 and 11 us is illustrated in secondary panel section So. The panel is lowered into the French section and the bentonite slurry contained therein to its final depth and then the backfill material is inserted as described alcove and is illustrated in connection with trim pipes 16 and 17.
I
Nile in Figure 2 there is illustrated a funnel shaped device BY for receivirlg the backfill material, it will be appreciated that this is purely diagrammatic as illustrate in a means for supplying backfill materials for filling the trench sections on each side of the polyethylene sheets at substantially equal rate so as to avoid undue loading and distortion and stretching of the sheet.
As shown in Figure 3, the thicknesses of the two pipe need no be the same nor need they even be of the same material. In order to remove any slack or lack of any tautness in the eye 12 7 the smaller diameter pipe may be given a rotary Tokyo or turn as indicated by the arrow 50 and the pipe 26 need not be hollow but can be a solid rod or pipe. Moreover, as will appear more fully hereafter, it need not be circular or round.
A non-shrinking grout 60 is then pumped into the pipe connections or space between the outer surfaces of the smaller diameter pipe 26 and the inner surfaces of the larger diameter pipe 11 so as to Norm a tight join.
In Figure 4, instead of round pipe sections, rocketing-far pipe sections are utilized. In the primary panel sea-lion P10 a pair of generally square pipe or channel sections 110 of impermeable high density polyethylene or other pies-tic material having high chemical resis~ivity can be utilized.
In this case, the high density polyethylene sheet 112 is sealingly bonded or joined to the facing flat surfaces luff and lllF throughout the entire length of the pipe or channel sections 110 and 111. Backfilling is carried out with the dual trim pipe system as shown in connection with jigs. 1 and 2 to form the primary panel elements Ploy Pit. In secondary panel section Slow a pair ox oppositely racing channel members 126 and 127 has the slat racing sections 126F and 127F bridging the gap between the legs 130 and 131 1.5~
of channel section ill and 132 and 133 of channel section 110. In this case, the legs 134, 135 of the smaller chant not member 126 are sprung outwardly slightly so that when section 126 is telescoped within the confines of pipe or S channel member 111, leg 134, 135 make a good solid contact with the internal surfaces of channel ill to thereby pro-vise a better seal and long paths to any pollutant. Again, the internal space 140 is filled with a non-shrink grout which is pumped into the connection to Norm a tight joint.
The high density polyethylene sheet 122 it made taut and spans the full length of the panel section to form the i~pervlous barrier. As shown, the ends of legs 136 and 137 of channel member 127 are turned inwardly so that the length of channel legs 136 and 137 is just slightly greater than the internal dimension of this space so that the legs 132 and 133 are sprung slightly outwardly o as to maintain a good tight joint. In this case, a slightly greater area of contact between the plastic pipes is utilized to form a tighter seal. To the left of element 4, the end of sheet 110' is sealed at two places 150 and 151 to a V-shaped channel member 160. Channel member 160 has a pair of legs 161, 162 which press against the inside surface 163 of channel member lo and against the inside back surfaces of short legs 132, 133 of channel member 110. Again any open space is filled with a non-shrink grout. It will be appreciated that various instrumentations may be installed in the joints to detect any imperfections in the joint.
Instead of a grout, any bentonite in the joints may be removed after the wall forming material has been inserted and then the open spaces are filled with a chemical setting agent such as various resins and the like to bond with the surfaces of the two pipe or sections forming the joint.
I
In Figure 5, the let most joint incorporates a Z-shaped channel member which has a pair of legs 170, 180 which are transverse or normal to the line ox the wall and a connecting leg 185 which urges the legs 170 and 180 into contact with their opposing surface legs 130, 131 and the inside surface ill ox channel member 111. As in the structure shown at the joint to the loft of Figure 4, there are three elongated contact points forming three - separate and distinct barriers A, B, C to the EYE Of pollutant through the joint.
A shown in Figs. 4 and 5, while it is referable to utilize the same type joint throughout the line of the wall, this is not necessary and the different type ox joints may be intermixed as to take advantage of the different type constructions. While the walls have been shown a being straight walls, it will be appreciated that they may be curved and closed on itself to make an endless wall such as for an impoundment pond enclosure of the like.
In other words, with reference to Figure 4, when the panel element 126, 13S, 122 is inserted and the backfilling material placed, elements 110 and 111 may be the facing ends of one wall structure. It will be appreciated that instead of a single sheet being secured Jo the channel or pipe members, double sheets folded and/or secured at the bottom may be utilized in the manner disclosed in Russ application Serial No. 252,676, filed April 9, 19~1, entitled "Method and Apparatus for Constructing a Novel Underground Impervious Barrier". As noted earlier, the walls can go to a depth of up to 300 feet. In the forming of the bonding of the polyethylene sheet to the rods, channel members, etc. it is good practice to firs sand or roughen the surfaces and preheat same to about 120F. A
bead of at least about l/2" or more of material provides a good impervious joint. As noted above, while it is desirable to use the same materials in forming the sheet as well as the pipe and channel members, this is not necessary. The pipe can be reinforced by fiber material such as fiber glass and the like but this is not necessary. The joint can be formed by chemical fusion or the like.
With respect to the pipes themselves, the ratio of diameter of the larger pipe to the smaller pipe such as to make it easier to grout the larger space between the two. For example, for a 3 foot wall, the large pipe will be about 3 feet in diameter while the smaller pipe would be about 12 inches or 1 foot in diameter.
The above described underground pollution control barrier and the method of making the same are also disclosed and are claimed in above-identified parent application, Canadian Patent Application Serial No, 447,968, filed on February 21, 1984.
kite there has been shown and described the pro-furred embodiment of the invention, it will be understood that this disclosure is for the purpose of illustration and various omissions and changes in shape, proportion and arrangement of parts as well as the substitution of equivalent elements or the arrangement shown and described may be made without departing from the spirit and scope of the invention as set forth in the appended claims.
mob/ ~'~
This invention relates to an apparatus for con-strutting a deep underground fluid barrier, such as an underground pollution control barrier.
This application is a division of cop ending Canadian Patent Application 447,968, filed on February 21, 1984.
The formation of underground impermeable barriers using slurry trench techniques has been widely developed in recent years and in a number of instances, attempts to utilize impervious plastic or rubber sheets to form impermeable barriers in such cut-off walls has been attempted. In Ryan US. patent 2,048,710, a pair of lining materials such as fabric or paper or other lining material which has been treated so that the lining material acts as a separator or divider between the earth material and the wall material after the wall material has been placed in the trench. In Zakiewicz US. Patent 3,603,099, an intraground water proof baffle is disclosed in which the roll of flexible water proof plastic foil is displaced along the line of the excavation so that as the trench is cut, the foil is lazed in a vertical plane behind the excavator and then the space between the foil and the sides thereof is filled with a wall forming material.
In Piccagli US. Patent 4,193,716 and Cannon et at US. Patent 3,759,044, plastic sheets are embedded in diaphragm walls. These processes and structures are not amenable to the placement of such synthetic plastic materials in deep excavation using the slurry wall construction technique. In Russ Canadian applique-lion Serial No. 400,763, assigned to the assignee hereof, a plastic sheath or envelope is provided in which the wall forming material is in the sheath or envelope.
One aspect of the invention resides in an apparatus for constructing a deep underground fluid barrier in an elongated slot excavated in the earth, the apparatus including a pair of vertical, spaced apart rigid plastic coupling members having mutually facing first surfaces and oppositely facing second surfaces. A plastic sheet spans the space between the first surfaces, the plastic sheet having lateral ends which are sealingly coupled to the mutually lacing first surfaces of the plastic coupling members. Means forms a slot in each of the oppositely facing surfaces of the plastic coupling members.
In the illustrated embodiment of the invention the apparatus further includes first and second spaced apart vertical rigid plastic secondary members, the first and secondary rigid plastic members having mutually facing third and fourth surfaces, respectively. A plastic sheet spans the space between the mutually facing third and fourth surfaces and has lateral ends which are sealingly joined to the facing third and fourth surfaces, respectively. Each spaced apart rigid plastic secondary member is of a size as to be telescopically received in one of the first named pair of spaced apart coupling members, with the secondary flexible plastic sheet passing through the means forming the slot in the plastic coupling members.
The above described apparatus is designed for use in a pollution control barrier which includes a narrow slot excavated in the earth using the bentonite slurry technique as disclosed in Vender US. Patent 3,310,952, such that the earthen walls are impregnated with bentonite and a bentonite cake is formed on the surfaces thereof. These plastic sheets are inserted in the slot and, preferably, are aligned with the center of the slot and a wall forming material fills the slot on both sides owe the plastic sheets.
More specifically, the present invention is in the form of plastic sheets which may be considered to be divided into primary and second panel sections, the lateral ends of the primary panel sections of the plastic sheet being sealingly secured to facing surfaces of pairs of spaced apart primary plastic tubular members. The pairs of spaced apart primary plastic tubular members have slots in surfaces opposite the surfaces to which the lateral ends have been sealingly secured, and the members have a dimension and a direction transverse to the length of the narrow trench at least equal to the width of the narrow trench to form primary panel elements. The lateral ends of the secondary panel sections of plastic sheet are sealingly secured to the facing surfaces of a pelf of secondary rigid plastic ~3~L54~
members so as to form secondary panel elements. At least a pair of the primary panel elements as formed in the manner described above, are inserted islet the slurry filled trench in spaced apart relation with the slots in the primary tubular members of the pair of primary panel sections facing each other. The slurry is displaced from the narrow trench between each of the pair of spaced apart primary tubular members with a backfill material, the spaced apart tubular members serving as end stops for the backfill materials. One of the secondary panel elements is inserted between the inserted pair of primary panel elements with the secondary tubular member telescoping within the spaced bounded by the primary tubular elements, the plastic panel section passing through the slots respectively. The remaining space between the primary plastic tubular members and secondary rigid plastic members and bounded by the primary tubular members is sealingly filled.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, advantages and features of the invention will become more readily apparent from the accompanying drawings in which:
Figure 1 is a top plan view of an underground poll-lion control barrier including the apparatus of the present nventlon;
Figure 2 is an elevation Al view of the construction shown in Figure 1, Figure 3 is an enlarged view of a joint according to the invention, Figure 4 is a top plan view of a modification of the invention and, Figure 5 is a top plan view of a further modifica-lion of the invention.
I
Referring now to Figs. 1, 2 and 3, the primary panel sections Pi, P2...PN are formed in excavations which are carried out under a bentonite slurry to a depth D which is at least down to the level below which any expected pollutant may be found or expected to flow and typically is down to the water table and in panel lengths typically of 15 to 30 feet. A pair of high density polyethylene pipes or tubular channel members 10 and 11 having diameters equal to the width W of the trench section is connected by a high density polyethylene sheet 12 which, in this example, is about 100 mills thick, but which obviously can be of greater or lesser thicknesses and of any other plastic material having appropriate chemical and mechanical properties. The lateral ends 13 and 14 of high density polyp ethylene sheet 12 are bonded to the external surfaces of high density polyethylene pipes 10 and 11 in an impervious fluid type manner by mob/
Ed electronic or chemical welding, fusion or joining and sealing all of which are conventional. Single high den-sty polyethylene sheet 12 may be composed of several sheets which are musingly joined or bonded at their edges to for the desired barrier but in the preferred embody-mint, it is a single integrally formed sheet so as to assure thaw there are no leaks in the sheet. Plastic sheet 12 is joined to pipes 10 and if at lateral edges 13 and 14 prior to insertion of same into the excavated trench.
Once the panel section is set, the bentonite slurry on each side of sheet 12 is displaced by a backfill which can be a mixture of soil-bentonite, cement-bentonite or concrete, etc. As shown in connection with the filling of secondary panel section Sly the backfill is accomplished by the trim pipe technique whereby the backfill material its hydraulically intro Cal into ho excnv~i.on on Boyle sides of the sheet by hollow steel tubes 16-17 which are gradually raised so that their lower ends remains within the heaps 18 of backfill material on both sides of sheet 12 so that there is no differential backfill loading applied to the sheet. The lower ends of the tubes remain within the backfill heap 20 and the slowing rising heap of backfill material rises upwardly and the amount of bentonite which is in the excavation there above is displaced and removed for storage for use in other excavating operations. The opera-lion is terminated when the backfill material reaches the surface of the ground. A clay or concrete cap or cover may be applied at the surface of the wall.
In accordance with the technique disclosed in this preferred embodiment, the length of the secondary panel So is omitted and another primary panel Pi is installed lot-lowing the procedure described above.
I
The pipes 10 and 11 have wall thicknesses ox 3/4 to 1 inch. They may be cast or extruded, with or without no-enforcement fibers, etc.
It will be appreciated that the primary excavations can be made using any conventional slurry Ryan exc~v~l~ion technique such as a clam shell, rotary drill bits and even bucked in the shallower depth walls. moreover the trench excavations can be made in panel sections or as a continuous length trench in which the excavation is formed and main-10 aliened in a ben~onite slurry and iris a least two primary panel sections Pi and Pi are installed and backfilled Jo form table structures and then the intervening secondary panel So is installed between two primary panel elements Pi, Pi.
In installing the secondary panel element Sly a second defy panel of high density polyethylene sheet 22 has its lateral ends 23 and I secured to smaller dynamiter high (fell sty polyethylene rods, pipes, tubes I and 27, respectively, the facing surfaces of the larger diameter polyethylene pipes 10 and 11 have full length slits or slots in the surfaces, thereof facing the excavation for the secondary panel eye-mint Sly These slits or slots 30, 31 are made at least large enough so that they can easily accomoda~e the thickness of the high density polyethylene sheets 22, the edges of the lips or slots being smooth and rounded without sharp edges 90 as to avoid damaging the plastic sheet. This panel section it then lifted and the two smaller diameter pipes 26, 27 are lowered or telescoped into the larger diameter pipes 10 and 11 us is illustrated in secondary panel section So. The panel is lowered into the French section and the bentonite slurry contained therein to its final depth and then the backfill material is inserted as described alcove and is illustrated in connection with trim pipes 16 and 17.
I
Nile in Figure 2 there is illustrated a funnel shaped device BY for receivirlg the backfill material, it will be appreciated that this is purely diagrammatic as illustrate in a means for supplying backfill materials for filling the trench sections on each side of the polyethylene sheets at substantially equal rate so as to avoid undue loading and distortion and stretching of the sheet.
As shown in Figure 3, the thicknesses of the two pipe need no be the same nor need they even be of the same material. In order to remove any slack or lack of any tautness in the eye 12 7 the smaller diameter pipe may be given a rotary Tokyo or turn as indicated by the arrow 50 and the pipe 26 need not be hollow but can be a solid rod or pipe. Moreover, as will appear more fully hereafter, it need not be circular or round.
A non-shrinking grout 60 is then pumped into the pipe connections or space between the outer surfaces of the smaller diameter pipe 26 and the inner surfaces of the larger diameter pipe 11 so as to Norm a tight join.
In Figure 4, instead of round pipe sections, rocketing-far pipe sections are utilized. In the primary panel sea-lion P10 a pair of generally square pipe or channel sections 110 of impermeable high density polyethylene or other pies-tic material having high chemical resis~ivity can be utilized.
In this case, the high density polyethylene sheet 112 is sealingly bonded or joined to the facing flat surfaces luff and lllF throughout the entire length of the pipe or channel sections 110 and 111. Backfilling is carried out with the dual trim pipe system as shown in connection with jigs. 1 and 2 to form the primary panel elements Ploy Pit. In secondary panel section Slow a pair ox oppositely racing channel members 126 and 127 has the slat racing sections 126F and 127F bridging the gap between the legs 130 and 131 1.5~
of channel section ill and 132 and 133 of channel section 110. In this case, the legs 134, 135 of the smaller chant not member 126 are sprung outwardly slightly so that when section 126 is telescoped within the confines of pipe or S channel member 111, leg 134, 135 make a good solid contact with the internal surfaces of channel ill to thereby pro-vise a better seal and long paths to any pollutant. Again, the internal space 140 is filled with a non-shrink grout which is pumped into the connection to Norm a tight joint.
The high density polyethylene sheet 122 it made taut and spans the full length of the panel section to form the i~pervlous barrier. As shown, the ends of legs 136 and 137 of channel member 127 are turned inwardly so that the length of channel legs 136 and 137 is just slightly greater than the internal dimension of this space so that the legs 132 and 133 are sprung slightly outwardly o as to maintain a good tight joint. In this case, a slightly greater area of contact between the plastic pipes is utilized to form a tighter seal. To the left of element 4, the end of sheet 110' is sealed at two places 150 and 151 to a V-shaped channel member 160. Channel member 160 has a pair of legs 161, 162 which press against the inside surface 163 of channel member lo and against the inside back surfaces of short legs 132, 133 of channel member 110. Again any open space is filled with a non-shrink grout. It will be appreciated that various instrumentations may be installed in the joints to detect any imperfections in the joint.
Instead of a grout, any bentonite in the joints may be removed after the wall forming material has been inserted and then the open spaces are filled with a chemical setting agent such as various resins and the like to bond with the surfaces of the two pipe or sections forming the joint.
I
In Figure 5, the let most joint incorporates a Z-shaped channel member which has a pair of legs 170, 180 which are transverse or normal to the line ox the wall and a connecting leg 185 which urges the legs 170 and 180 into contact with their opposing surface legs 130, 131 and the inside surface ill ox channel member 111. As in the structure shown at the joint to the loft of Figure 4, there are three elongated contact points forming three - separate and distinct barriers A, B, C to the EYE Of pollutant through the joint.
A shown in Figs. 4 and 5, while it is referable to utilize the same type joint throughout the line of the wall, this is not necessary and the different type ox joints may be intermixed as to take advantage of the different type constructions. While the walls have been shown a being straight walls, it will be appreciated that they may be curved and closed on itself to make an endless wall such as for an impoundment pond enclosure of the like.
In other words, with reference to Figure 4, when the panel element 126, 13S, 122 is inserted and the backfilling material placed, elements 110 and 111 may be the facing ends of one wall structure. It will be appreciated that instead of a single sheet being secured Jo the channel or pipe members, double sheets folded and/or secured at the bottom may be utilized in the manner disclosed in Russ application Serial No. 252,676, filed April 9, 19~1, entitled "Method and Apparatus for Constructing a Novel Underground Impervious Barrier". As noted earlier, the walls can go to a depth of up to 300 feet. In the forming of the bonding of the polyethylene sheet to the rods, channel members, etc. it is good practice to firs sand or roughen the surfaces and preheat same to about 120F. A
bead of at least about l/2" or more of material provides a good impervious joint. As noted above, while it is desirable to use the same materials in forming the sheet as well as the pipe and channel members, this is not necessary. The pipe can be reinforced by fiber material such as fiber glass and the like but this is not necessary. The joint can be formed by chemical fusion or the like.
With respect to the pipes themselves, the ratio of diameter of the larger pipe to the smaller pipe such as to make it easier to grout the larger space between the two. For example, for a 3 foot wall, the large pipe will be about 3 feet in diameter while the smaller pipe would be about 12 inches or 1 foot in diameter.
The above described underground pollution control barrier and the method of making the same are also disclosed and are claimed in above-identified parent application, Canadian Patent Application Serial No, 447,968, filed on February 21, 1984.
kite there has been shown and described the pro-furred embodiment of the invention, it will be understood that this disclosure is for the purpose of illustration and various omissions and changes in shape, proportion and arrangement of parts as well as the substitution of equivalent elements or the arrangement shown and described may be made without departing from the spirit and scope of the invention as set forth in the appended claims.
mob/ ~'~
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for constructing a deep underground fluid barrier in an elongated slot excavated in the earth comprising, a pair of vertical, spaced apart rigid plastic coupling members having mutually facing first surfaces and op-positely facing second surfaces, a plastic sheet spanning the space between said first surfaces, said plastic sheet having lateral ends which are sealingly coupled to said mutually facing first surfaces on said plastic coupling members, and means forming a slot in each said oppositely facing surfaces of said plastic coupling members.
2. Apparatus for constructing a deep underground fluid barrier as defined in claim 1 including first and second spaced apart vertical rigid plastic secondary members, said first and second rigid plastic members having mutually facing third and fourth surfaces, respectively, said plastic sheet spanning the space between said mutually facing third and fourth surfaces and having lateral ends which are sealingly joined to said facing third and fourth surfaces respectively, each said spaced apart rigid plastic secondary member being of a size as to be telescopically received in one of the first named pair of spaced apart coupling members with said secondary flexible plastic sheet passing through said means forming a slot.
3. Apparatus for constructing an underground fluid barrier in an elongated slot excavated in the earth, as defined in claim 1 wherein said plastic sheet spanning the space between said first surfaces is flexible.
4. Apparatus for constructing an underground fluid barrier as defined in claim 2 wherein said plastic sheet spanning the space, between said facing third and fourth surfaces is flexible.
5. Apparatus for constructing a deep underground fluid barrier as defined in claim 4, wherein said vertical, spaced apart, rigid plastic coupling members and said first and second spaced apart vertical rigid plastic secondary members are made of high density polyethylene.
6. Apparatus for constructing a deep underground fluid barrier as defined in claim 5 wherein the lateral ends of the plastic sheet spanning the space between said first surfaces are fusingly bonded to sail first surfaces.
7. Apparatus for constructing a deep underground fluid barrier as defined in claim 5 or 6 wherein said plastic sheet spanning the space between said mutually facing third and fourth surfaces are fusingly bonded to said vertically rigid plastic secondary members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000525269A CA1231541A (en) | 1983-02-22 | 1986-12-12 | Apparatus for constructing underground fluid barrier |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/468,724 US4601615A (en) | 1983-02-22 | 1983-02-22 | Environmental cut-off for deep excavations |
| CA000447968A CA1224929A (en) | 1983-02-22 | 1984-02-21 | Environmental cut-off for deep excavations |
| CA000525269A CA1231541A (en) | 1983-02-22 | 1986-12-12 | Apparatus for constructing underground fluid barrier |
| US468,724 | 1990-01-24 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000447968A Division CA1224929A (en) | 1983-02-22 | 1984-02-21 | Environmental cut-off for deep excavations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1231541A true CA1231541A (en) | 1988-01-19 |
Family
ID=25670299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000525269A Expired CA1231541A (en) | 1983-02-22 | 1986-12-12 | Apparatus for constructing underground fluid barrier |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1231541A (en) |
-
1986
- 1986-12-12 CA CA000525269A patent/CA1231541A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |