JPS5813820A - Impervious underground barrier wall and construction thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel impermeable underground barrier useful for confining water, oil, and other fluid substances and preventing pollution, and a method for constructing the same. Regarding. This barrier is particularly useful in residential areas where government departments and industry face subsurface seepage prevention problems, and in situations where there is little or no gradient between the external water table and internal contaminated areas. It is a useful barrier.

Prior to this invention, attempts have been made to line underground slurry trenches with impermeable membranes of membrane liners, plasti, sheets, metal foils, and the like, but these attempts have been particularly successful. Not pL* (r 3
trastural and Cut-OffDlap
hragm Walls J, #El 30 pages,
Written by R.Q.H.Boymrs, John Wal.
U.S. Patent No. 2*048,71
0 @Ranny Pat@nt) discloses an underground wall construction device. For this device, the drilling seal PO
Two rolls of backing material are placed on the inside of the wing, and prior to filling the groove with the desired wall material, the rolls of backing material are returned 41 to line the walls of the groove. There is no teaching of the use of folded (or bonded) backing material at the bottom or of sufficient height to hang over the sides of the groove. The % characteristic is to use the K filler to load (weight) the backing material and to transfer the moving force to the bentonite using the backing material to move the bentonite.

US MS Permit No. 3,603.099 (Zakl@vl@s
Pat@t) and U.S. Pat. No. 3,759,044 (eaten at alPat@nt), a plastidite is immersed in a round groove filled with pendonite mud. The former patent (Zaklevi*m i'at
＠nt)D In the case of D, filler material is added on both sides of the plastic membrane in the ninth stage of moving the digging flJx rally, and in the case of the latter patent (Carat＠t al Pat＠nt) meet nine fl
i(D#?Kf), the sheet is immersed and left until the wall material has hardened. In the present invention, double layer end folding creates a base wall structure not disclosed in the prior art.

The use of liners for underground pipe and conduit preservation is described in U.S. Pat. No. 2,007,969 (Gredsky Pa.
tent) and U.S. Pat. No. 3,675,432 (-
It is well known to those skilled in the art as disclosed in Tsuru et al.

However, these are different from the present invention, and neither of these are disclosed in the concept of a slurry trench excavation method, and in any sense the wall depth and There is no teaching regarding technique 1, but a depth of 30 to 40 mm for containing industrial contaminants or for confining water or fluid substances.
It is tomorrow that I have not taught or suggested foot membranes. U.S. Patent No. 3,298,183, No. 3,2
No. 18,810 and No. 3,182,459 (Gr@
th@r@tal Patent) K discloses an O fluid barrier for confinement and/or diversion of water, but does not consider underground structures, and the double folded material simply They are simply folded on top of each other on the ground, and a lock is installed to secure them against the force of water upstream.

A basic object of the present invention is to provide an improved impermeable basement wall structure, particularly for pollution prevention, and an improved method and apparatus for constructing said impermeable basement wall structure.

The basic q# feature of the present invention is that the backing material is a folded plastic (forming a ninth cover or envelope for the refilling material), and both sides of the backing material are covered with slurry. Both sides of the grooves filled with K are of sufficient height to extend in a hanging manner over the surfaces of the grooves, preferably by hydraulically supplying a retentate material having a higher p density than the slurry in the grooves. Groove the fold line! The aim is to reduce the amount of systree required by sinking the bentonite slurry towards the end of the trench where the excavation is taking place at the time. The double layer plastic material is unrolled along the groove, and the portion extending above the ground is opened to hydraulically supply the filling material between the two grooves. The typical material is a mixed material of sand and water, which is 2.
It has two effects. That is, it has the effect of sinking the groove to the bottom of the groove and bringing it into close contact with the groove side wall, and the effect of moving the bentonite in the forward direction of excavation to reduce the amount of bentonite required for excavation. A wall structure constructed using such technology is novel in the following respects. That is, the bentonite is infiltrated into the side wall of the ditch formed in the soil, adjacent to the wall, the bentonite solid layer, the plastic membrane, and the re-excavation material inside the plastic membrane ( Typically, sand 1 is composed of a coarse granular material), and this same composition is similar to Fi! This point is also formed on the wall side opposite to 7#I.

The advantage of this configuration is that it is completely watertight due to the continuous arrangement of two identical contaminant leak prevention barriers made of bentonite-impregnated soil, solid pentonite F, plasti, and membrane. It is to guarantee that Furthermore, since the refilling material sinks the plastic, plastic coating, or enveloping to the bottom of the groove, all that is required is to first insert a roll of Gufusuti or Kushito into the groove and perform a preliminary refill, and the plastic material will be rolled up from the roll. The backfill or fold is unfolded and floats in the trench or trench, the top of which is opened to supply backfilling material therein and to move the bentonite slurry toward the other end of the trench or trench.

The above and other objects, advantages and features of the present invention will now be described in detail with reference to the accompanying drawings.

The basic method of constructing an underground barrier for pollution prevention according to the present invention is as follows:
The step involves excavating a narrow trench or elongated depression along the desired contamination control subterranean barrier placement line in the presence of bentonite slurry. Bentonite is preferred as the slurry, but other materials with similar functionality to the bentonite slurry may be used; however, the bentonite slurry should be prepared so that it has the property of penetrating the soil adjacent to the trench. Bentonite slurries are preferred because they are well compatible and can form a first stage barrier against contaminants. On top of this, a pentonide solid layer is formed in the wall soil during one excavation, which acts as a second barrier against the flow of all pollutants. After excavating the first groove or elongated depression, the groove is
nt) A coating or envelope consisting of two layers of plasti-membrane is placed in a groove or slot while being filled with a slurry keeping it open in the method disclosed. inserted into. This cover, or cover, is folded over at the bottom of the groove, is open at the top, and hangs down over both sides of the groove, and is wide enough in the vertical direction to extend above the ground. It has the following.

In FIG. 1, the groove or elongated depression T is an excavator,
The barrier is excavated to the desired depth using a drill, kuhoe, trencher, or similar machine. Typical applications of the invention are at depths of 30 to 40 feet, and typically more than about 20 feet below groundwater. In the illustrated embodiment, U.S. Pat.
No. 52 (V*d@r Pat@nt) Teaching Notice #) K1
Groove T was filled with bentonite slurry B up to its mouth. A portion of the load of the lifting and loading device IO may be transferred to the slurry by using slurry flotation techniques such as that disclosed in applicant's U.S. Application No. 173,538. The lifting and upsetting device IO is
Control line 1 leading to Kufilm delivery roll 13
It has a game 11 carrying 2. The frame 14 with bearings 15, 16 for supporting the roll 13 is connected to the stabilizing member 1 extending from the lifting gear [10].
It is held vertically by 7.18. Plasti.

Kutuil 5F (forming a backfilling material covering or enveloping) has the strength to withstand deformation and not cause tearing, and depending on the situation, it may be strengthened or reinforced with woven fabric WF to increase its strength. It also slows down.

After forming the first part, open the ends of the covering or covering made of Plasti and Ririru 5F, and let both ends hang over the sides of the groove, so that the fold line is approximately in the groove. Make sure it's centered. In this state the end will be floating on the bentonite layer, at this time the refilling material tube will start to supply hydraulic pressure between the plastic sheets 6 A typical refilling material is to use a mixture of sand and water. This mixture has two effects. In other words, the material to be placed is a plasti or sheet placed at the bottom of a #I or elongated recess and brought into close contact with both sides of the groove, and a force is applied to the bentonite slurry through the plastic or sheet to move the bentonite slurry into the groove. This reduces the amount of bentonite slurry required for drilling. On the other hand, the ends of the grooves can be sealed, and after the ends of the sheathing are pressed against the groove bottom with a rigid rod member, the sheathing or enveloping can be filled with refill material, if desired, as described above. It is also possible to heat seal the ends of the coating along a vertical line to join both sides.

If a coarse granular material is used as the filler material within the plastic coating, a highly permeable layer encapsulated within the plastic coating can act as a filter. Draining liquid from the filter material is an excellent way to maintain the effectiveness of the barrier, ensuring that any contaminants that passed through the barrier in the first place are collected and removed with minimal pumping volume over long time intervals. Figure 3 shows the state when the film is unwound from the roll 13, as shown in the top view of Figure 2, both ends 20.21 of the glass film are are overlaid on the upper surface of both side walls of the groove. The bentonite slurry 1 in the groove T is immersed and exerts a liquid head pressure on both sides of the plastic film, forcing all the air out of the structure, thus hydraulically supplying the refilling material and forming the plastic film. A pressure force S is applied to the inner surface of the
This forces the bentonite slurry towards the excavation end of the trench, thus reducing the bentonite requirement for excavation.

It will be appreciated that the drilling slurry may actually be a bentonite mixture having cementitious properties and that the reconsolidation material 30 may be a naturally solidified material such as a mixture of cement and Pentonite F.

When the amount of film remaining on the roll 13 becomes low, the burying operation is interrupted leaving a distance of 50 feet). The roll 13 is then pulled up from the groove, the remainder is completely unwound, the bentonite material is washed off, and the second roll is placed on a flattened support, the end of which is unwound and the bentonite material is washed off. The illumination of the film of the first C) roll and the starting end of the film of the second roll are welded using a film welding method. For example, R, F, @, or other heat seam welding can be used to join the beginning of the film on the new roll to the end of the film on the old roll. After the joining is completed, a new roll is lowered into the groove or elongated depression T, and the front end O of the groove is excavated and the backfilling operation is restarted.

In this regard, instead of folding the roll film (by vertically setting the roll) and placing the perforated crease at the bottom of the groove, the film can be vented by simply rolling the roll along the top of the groove. K to float above Titos 2 Lee. Both ends of the roll extend a considerable distance beyond the edge of the twig, and the ends of the roll are pushed into the trench bottom with either refilling material or a rigid rod, and the refilling operation begins. Ru. In this case, the roll itself is never lowered below ground level and the end of the roll is open and clean for the ninth welding operation to add the next roll.

Larger rolls can be accommodated by varying the groove width along the barrier OII. Therefore, the groove width can be made narrower as the roll is unwound. This method is longer a
- It has the advantage of being able to use film and reducing the number of connections.

FIG. S shows the backhoe excavator 40 excavating a groove or elongated depression ft, and the groove τ is filled with Bentotitos 2B. The six racks 41 carrying the backing material L folded in an accordion shape are connected to the packed excavator 40 by a pull cable or a pull rod 42. KoO
In the method, Grasti and Tafilum O are combined,
Fold the film in an accordion shape on the ground to make a large one, open the folds with the s4 materials, and
As shown in the figure, 5 includes the step of pushing the film into the sieve.
When joining the end of a roll of film, there is no need to remove the spent roll as in Example 11C). As shown in FIG. 6, as in the case of FIG. 4, bentonite infiltration zones 540, bentonite jelly and bentonite solid H6 are formed on both sides of the groove, respectively! As can be seen in Figure 0, the f-stick film is rolled from a pair of parallel rolls. The lower edges of the film O, which can be removed from both rolls before it enters the filter, are joined by thermal bonding or other methods to form a joint 43 that will finally be placed at the bottom of the groove. Form. Note that in the fNIJ, the reference numeral 44 indicates a key, f, but its use is arbitrary.

As mentioned above, Zero W! In Book A11A, the depth zone is particularly useful for preventing subsurface seepage in areas surrounding industrially contaminated areas and in areas where there is little or no gradient between the external water table and the interior of the contaminated area. Saga 3
Discloses an improved plant and illumination site for constructing new O-impermeable membranes from 0 to 40 feet; furthermore, the present invention provides a relatively quick and comparative method for constructing water and oil reservoirs, barrier walls, channel excavations, etc. It is also possible to apply it to construction at a low cost.

Although the above has disclosed several embodiments of the present invention and suggested other modifications, it is obvious to the person skilled in the art that the present invention is capable of many modifications. are included within the spirit and scope of the invention as defined in the claims.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the groove showing the embodiment of the present invention 01, FIG. 2 is a top view of the groove of FIG. 1, and FIG. Layered plasti. A cross-sectional view showing the state of the sheet, covering, or enveloping backing material before it is filled with the mound restoration material.
FIG. 5 is a cross-sectional view showing the condition in which a light, plastic, sheet, covering or enveloping backing material is filled with retrieval material along line 4; FIG. 6 is a sectional view taken along the line 6--6 of FIG. 5; FIG. It is. 5-bentonite infiltration zone, 6-bentonite solid layer, 10...lifting device, ll-boom, 1
2...Control cable, 13--Plasti, refil^ delivery roll, 14--Frame, l5, 16--Bearing, 17, 18--Stabilizing member, 20.21-Plasti, Ku Edge of film, 30 - Reshaping material, 40...
Excavator, 41... Frame, 42--Tension cable (pulling rod), 4
3...Joint part, 44...Kya, 7", F,!'・-
Plasti, film (plasti, film, backing material)
,T,? '-・l1l (elongated depression, finely divided), WF
... Woven fabric, B-... Bentonite slurry. Patent Applicant Buinic Besroten Be° Notes 7゜ Patent Application Agent Patent Attorney Aosui Roben Rushi Nishidate Kazuyuki Patent Attorney Donakayama Kyosuke Patent Attorney Akira Yamaguchi Engraving of the drawing (no changes to the content - FIG, 3 FIG, 4) Procedural Amendment Form C) August 1980 Kazuo Wakasugi, Commissioner of the Japanese Patent Office, 1. Indication of the Case 1989 Patent Application No. 0894112 2. Title of Invention Impermeable Underground Barrier and Method of Construction 3. Amendment. Relationship with the case of the applicant Patent applicant Name Name of the patent applicant Title 4, agent 6, subject of amendment (1) “Applicant representative” column in the application (2) Power of attorney (3) Diagram Side 7. Contents of amendments (1), (2) as shown in the attached sheet (3) Engraving of drawings (no change in content) 8. 0 of attached documents

Claims (1)

[Scope of Claims] 1(1) A contaminant is formed in the soil with a length that crosses the pipe and a likelihood of reaching at least groundwater m<ft.
, lIA long groove; (2) pentonite which permeates the soil wall of the long and narrow groove and forms a bentonite solid layer tube on the inner surface of the soil wall; (3) pentonite in the long and narrow groove; All of the long and narrow grooves! llf
(4) a material filling the coating and having a density greater than that of the peytonite-free material used in forming the elongated groove; An underground barrier for fluid mass flow restriction comprising: 2. An underground barrier for fluid mass flow restriction as claimed in claim 1, comprising means within said sheathing for draining liquid from the rebalancing material. & The underground mai for fluid material flow restriction according to claim 1, wherein the material filled in the coating is sand.
. ζ An underground barrier for restricting O fluid material flow according to claim 1, wherein the material filling the coating is a naturally assimilated wall-forming material. 1. An underground barrier for fluid mass flow restriction according to claim 1, wherein the material filled in the coating is a mixture of cement and bentonite. 2. The underground barrier for fluid mass flow restriction according to claim 1, wherein said plastic coating includes a reinforcing material. L. The barrier for fluid substance flow restriction according to claim 6, wherein the reinforcing material is a woven fabric. & the soil material filled with said covering is a coarse granular material (LJ), and is provided with means for draining liquid from said coarse granular material. Barrier. A long and narrow groove formed in the soil and extending downward to at least the depth of groundwater rIjJ, a plastic coating that is in contact with at least both IIWJ and the bottom of the long and narrow groove, and a plastic coating in the plastic coating. a contaminant control barrier comprising: a refill material inserted therein; Lay in the presence of bentonite slurry adjacent to each of the side walls facing the barrier O and along the bottom of the groove, and fill the space between the backing materials with the backing material. jP A method for constructing an underground barrier for fluids, comprising the step of moving the bentonite slurry in a predetermined direction. IL The method of claim 1O, wherein the backing material is plasti. 1z The film restoration material is a coarse granular material), and in a loose state, at least the bottom and both sides thereof are surrounded by the lining material, and when being filled, the bentonite slurry is moved in the predetermined direction. 10. The method according to claim 1O, wherein the material is 1λ The flexible impermeable backing material is comprised of a pair of plasti, kushids, hermetically joined at their adjacent lower edges to form an impermeable O envelope in the #lO. The method according to claim 11S. λ table When a trench is excavated along the desired line of the barrier wall in the presence of bentonite slurry, the bottom of the trench is joined at the part that overlaps, and the upper part is open).
laying a double-layered plastic membrane of sufficient vertical extent to extend beyond the ground on both sides; and placing the double-layered plastic membrane in a trench. From the double-layered plasti, the two membranes facing each other [KJ
The density of the film restoration material is adjusted to a bentonite slurry O.
! By making the film larger than y degrees, the film becomes
t, the bentonite slurry moves forward in the trench toward the #IO excavated end, reducing the amount of bentonite slurry required for excavation, so that each is impregnated with bentonite and the respective surface is Two soil sidewalls and plasti formed adjacent to a bentonite solid layer,
A method for constructing an underground barrier for contaminant control, wherein the barrier is constituted by a membrane and a buried material existing at the surface facing each other.