US3797251A

US3797251A - Drain material for use in a water-containing poor subsoil and a method for installing said drain material therein

Info

Publication number: US3797251A
Application number: US00282154A
Authority: US
Inventors: T Shimizu
Original assignee: Kumagai Gumi Co Ltd
Current assignee: Kumagai Gumi Co Ltd
Priority date: 1971-08-31
Filing date: 1972-08-21
Publication date: 1974-03-19
Anticipated expiration: 1991-03-19
Also published as: JPS4946966B2; JPS4832310A

Abstract

There are disclosed a drain material and a method of installation thereof, in which a column-shaped or rod-shaped drain member of an extremely light and continuous cellular foamed synthetic resinous material is used as a drain material for withdrawing water from the water-containing poor subsoil to improve the strength or condition of the soil, thereby providing convenience for transportation and simplicity in working. For facilitating the insertion of the drain member into the watercontaining poor subsoil, a casing pipe having a lid member at its lower end is employed. When the casing pipe is withdrawn from the water-containing poor subsoil, the drain member is pressed down either by a weight secured to the lower portion of the drain member or by compressed air pressure thereon to prevent upward shifting caused by the frictional force between the drain member and the casing pipe.

Description

United States Patent 7 [1 9] Shimizu Mar. 19, 1974 A METHOD FOR INSTALLING SAID DRAIN MATERIAL THEREIN l [75] Inventor:

[73] Assignee: Kabushiki Kaisha Kumagaigumi,

Fukui-ken, Japan 22 Filed; Aug. 21, 1972 21 Appl. No: 282,154

Teruo Shimizu, Tokyo, Japan [30] Foreign Application Priority Data Aug. 31, 1971 Japan 46/66279 [56 References Cited UNITED STATES PATENTS l/l9 69 Hanrahan 61/10 9/1968 Rodgers 6/1965 Snow et a1. 61/63 X 3,300,987 l/1967 Maeda 61/63 Primary Examiner-Jacob Shapiro Attorney, Agent, or Firm-George B. Oujevolk 57 V ABSTRACT There are disclosed a drain material and a method of installation thereof, in which a column-shaped or rodshaped drain member of an extremely light and continuous cellular foamed synthetic resinous material is used as a drain material for withdrawing water from the water-containing poor subsoil to improve the strength or condition of the soil, thereby providing convenience for transportation and simplicity in working. For facilitating the insertion of the drain member into the water-containing poor subsoil, a casing pipe having a-lid member at its lower end is employed. When the casing pipe is withdrawn frornthe watercontaining poor subsoil, the drain member is pressed down, either by a weight secured to the lower portion of the drain member or by compressed air pressure thereon to prevent upward shifting caused by the frictional force between the drain member and the casing pipe.

7 Claims, 15 Drawing Figures PATENTED MAR 19 I974 SHEEI 1 OF 4 FIG.

FIG.I 'FIG.2

FIG. 5

FIG. 6

FIG. 9

PIE IEO IIAR 1 9 I914

sum

2 or 4 FIG. 8

FIG. 7

PATENTEBIAR 19 I974 SHEET 3 0F 4 FIG. l2

FIG. IO

DRAIN MATERIAL FOR USE IN A WATER-CONTAINING POOR SUBSOIL AND A METHOD FOR INSTALLING SAID DRAIN MATERIAL THEREIN 1. Field of the Invention The present invention relates to a new drain material for withdrawing water from a high water-containing poor subsoil to improve the strength or condition of the soil and a new method for installing the drain material in the water-containing poor subsoil.

2. Description of the Prior Art In a high water-containing poor subsoil, because of poor load bearing capacity, construction of buildings or other structures is impossible. To accomodate erection of such structures thereon, an arrangement for improving the strength of the soil such as withdrawing water from the water-containing poor subsoil is required.

At present, the method for withdrawing water from the water-containing poor subsoil is by using an elongated tube made of a porous fabric material having a high strength and blocked at least at its lower end, the elongated tube being filled with sand to form a drain member, and the drain member being driven into the hole is the water-containing poor subsoil. Withdrawal of water from the soil is performed through said drain member. i v

The known method in which sand is used as a drain material, however, has defects in that use of a large quantity of heavy sand not only entails transportion costs but also is troublesome in working; and the use of the porous fabric material is comparatively expensive, because the porous fabric material for forming the elongated tube is required to have high strength sufficiently durable against the load of the large quantity of heavy sand, and is uneconomical, because the elongated fabric tube must be left in the subsoil, without being recovered.

SUMMARY OF THE INVENTION The principal object of the present invention is to provide a drain material for use in a water-containing poor subsoil, wherein a continuous cellular foamed synthetic resinous material of an extremely light weight as compared with sand is used as a drain material, thereby providing conveniencefor transportation and simplicity in working. g I

Another object of the present invention is to provide a drain material for use in a water-containing poor subsoil and a method for installing this drain material, wherein a column-shaped or rod-shaped drain member of a light continuous cellular foamed synthetic resinous material is placed within a casing pipe having a lid member at its lower end, to be driven into the water containing poor subsoil, so that the insertion of the light drain memberinto the soil is facilitated.

A further object of the present invention is to provide a drainmaterial for use in a water-containing poor subsoil and a method for installing said drain material therein, wherein, when a casing pipe is withdrawn from the water-containing poor subsoil, the drain member is pressed down either by gravity of a weight secured to the lower portion of .the drain member or by both gravity of weight and compressed air pressure, so that an upward shift of the drain member together with the casing pipe is prevented.

A still further object of the present invention is to a provide a drain material for use in a water-containing poor subsoil and a method for installing said drain material therein, wherein a lid member is mounted rotatably at one side portion thereof by a horizontal axle onto a lower portion of the casing pipe, said lid member being opened automatically due to the soil resistance acting thereon and maintained at the opened position, when the casing pipe is withdrawn from the watercontaining poor subsoil.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are perspective views each showing a colummshaped drain member of a continuous cellular foamed synthetic resinous material;

FIG. 3 is a side view of a casing pipe having a lid member at its lower portion;

FIG. 4 is an enlarged side view showing a lower portion of thecasing pipe;

FIG. 5 is an enlarged front view showing the lower portion of the casing pipe;

FIG. 6 is a bottom view showing the lid member of the casing pipe in the closed position;

FIGS. 7 through 10 are longitudinal sectional side views showing the order of installation of the drain member;

FIG. 11 is a cross-sectional view, taken along the line I-I of FIG. 8;

FIG. 12 is a longitudinal sectional side view of the casing pipe in the stage of withdrawing, said casing pipe being withdrawn, with the drain member being prevented from shifting upwardly by the weight and compression air pressure;

FIG. 13 is an enlarged view of an upper portion of FIG. l2; and,

FIG. 14 and 15 are cross-sectional views exemplifying the shape of a casing pipe and a drain member to be accommodated therein.

DETAIL ION OF THE INVENTION Drain members 1 shown in FIGS. 1 and 2 respectively are made of a continuous cellular foamed synthetic resinous material. The drain member 1 of FIG. 1 is formed into an elongated column shape of a circular cross-section and has the dimension which ranges,

for example, from 50 to 120 mm in diameter and from i 8 to 15 m in the longitudinal length. The drain member 1 in FIG. 2 is 'formed into an elongated column shape of a square cross-section, each side length of which is, for example, from 50 to 100 mm, and has the longitudinal length, for example, from 8 to 15 m i g A continuous cellular foam ed synthetic resinous material available for use in forming the drain member is, for example, a polyurethane sheet having a void space percentage from to percent.

FIGS. 3 through 6 show a casing pipe having a lid member at its lower portion, wherein a square-shaped steel lid member 3 is pivotally mounted at a side portion thereof by a horizontal axle onto a lower portion of a casing pipe shaped into a circular cross-sectional tube of steel, said square-shapedllid member having each side length substantially equal to an outer diameter of the casing pipe. Said casing pipe has an upper portion provided with holesS through which suspension hooks are to be engaged.

A circular cross-sectional steel' tube is available for use as the casing pipe, said steel casing pipe having dimension such as, for example, 80 to mm in inner diameter, 6 to 9 mm in a wall thickness and 9 to 16 m in the longitudinal length.

FIGS. 7 through 11 show a method for installing said drain member in the water-containing poor subsoil. As seen in FIG. 7, the casing pipe 2 is driven into the water-containing poor subsoil 7 by blows of a vibrator 6, with said lid member of the casing pipe being kept in the closed position. After the casing pipe 2 is driven in the subsoil 7 to a predetermined depth, the vibrator 6 is removed fromthe upper portion of the casing pipe 2.

As shown in FIGS. 8 through 11, a weight 8 such as a concrete block or a steel block is connected by a piece of wire or fibrous cord 10 to the lower portion of the elongated column-shaped drain member 1 of a continuous cellular foamed synthetic resinous material, and another piece of fibrous cord 10 is connected to the upper portion of said drain member. Thus, the drain member 1 is caused to be inserted from above into the casing pipe 2.

As seen in FIG. 9, suspension hooks 11 connected to the lower portion of the vibrator 6 are fitted in the holes provided on the upper portion of the casing pipe 2. Subsequently, the casing pipe 2 is caused to be withdrawn from the water-containing poor subsoil 7 by a rope 12 of a hoist with vibration being given by the vibrator 6, and thereupon, the lid member 3 is caused to automatically rotate in a vertical position due to the soil resistance acting thereon, so that the lower end of the casing pipe is rendered open. In the meantime, gravity of the weight 8 is exerted upon the drain member 1 around its lower portion, thereby preventing the upward shift of the drain member 1 due to the frictional force between the casing pipe and the drain member, and hence, the casing pipe 2 alone is withdrawn from the subsoil. Said drain member 1 which comes out of the lower end of the casing pipe is brought into contact with the soil. When the casing pipe 2 is completely withdrawn from the soil, the situation as shown in FIG. is obtained.

According to the installation method as disclosed in the foregoing passages, a large number of drain members are installed in the water-containing poor subsoil 7. After that, the load of sand is placed on the surface of the water-containing poor subsoil, whereby water contained in the poor subsoil 7 is withdrawn upwardly through respective drain members 1.

Respective members actually used in the embodiment of FIGS. 7 through 1 1 each have the following dimensions: l. A drain member:

A. A material:

polyurethane sheet.

B. a space rate: 85

C. A side length in a square cross-section:

timeters square.

A continuous cellular foamed 8 cen- D. A longitudinal length: 15 m 2. A casing pipe:

A. An inner diameter: 120 mm B. A wall thickness: 9 mm C. A longitudinal length: 16 m 3. A weight: 2 kg. 4. Horse Power of Vibrator: 40 kw FIGS. 12 and 13 show the casing pipe in the stage of withdrawing, i.e. wherein the casing pipe is being withdrawn, and both gravity of the weight and compressed air pressure are exerted upon the drain member to press down the member. In the drawings, a cap 13 is fixed by bolts 14 to the upper portion of the casing pipe 2, while the fibrous cord-10 connected to the upper portion of the drain member 1 is inserted through the hole 5 provided at the cap 13, to which a compressed air feed pipe 15 is also connected. The weight 8 is connected to the lower portion of the drain member 1.

The drain member 1 is pressed down by both the gravity of the weight 8 and the compressed air pressure of 2 kg/cm to 7 kg/cm being fed through the compressed air feed pipe 15, thereby preventing from upward shifting, while said drain member 1 is carried at its upper portion by the fibrous cord 10, to thereby be held in place, without being forced downward due to the compressed air pressure to be fed thereto. Thus, the casing pipe 2 is withdrawn from the water-containing poor subsoil by the rope 12 of the hoist with vibration being given by the vibrator 6.

FIGS. 14 and 15 are cross-sectional views, each showing the relationship between the drain member and the casing pipe. In the example of FIG. 14, both the drain member 1 and the casing pipe 2 each have a circular cross-section, while in that of FIG. 15, either of them has a square cross-section.

The embodiments as disclosed are merely examples of this invention, and changes or modifications on design or construction may be made without departing from the scope of the invention.

What is claimed is:. a

l. A-method for installing a drain-material in a poor subsoil which contains waterso as to drain the subsoil of the water, comprising the steps of:

a. driving vertically downwards through the soil to the subsoil an elongated casing having a lid with one portion of the lid pivoted to one end of said casing so that said lid is at the bottom and an open end of the casing is at the top, said lid having at least a second portion-substantially opposite said pivoted portion extending outwards from the circumference of said lid in a plane substantially normal to the direction of elongation of said casing, there being inserted into said casing a continuous cellular foamed synthetic resinous drain material; and,

b. withdrawing the casing from the subsoil, the pressure of said subsoil on said extending portion causing the lid to pivot open, so that said casing can be slipped out of the subsoil and soil leaving the drain material in place extending from the subsoil to the soil.

2. A method as claimed in claim 1 wherein said casing is first inserted into the subsoil and said drain materialis then placed into said casing.

3. A method as claimed in claim 1 wherein said drain material is first inserted into said casing and said casing together with said drain is inserted into said subsoil.

4. A method as claimed in claim 1 wherein simultaneously with the withdrawal of said casing, compressed air is directed from above onto said drain material to maintain said drain material in place during the removal of said casing.

5. A- method as claimed in claim 2 wherein simultaneously with the withdrawal of said casing, compressed air is directed from above onto said drain material to maintain said drain material in place during the removal of said casing.

7. A method as claimed in claim 1 wherein a weight is placed at the bottom of said drain material prior to being inserted into said casing so as to maintain said drain material in place during removal of said casing. k

Claims

1. A method for installing a drain material in a poor subsoil which contains water so as to drain the subsoil of the water, comprising the steps of: a. driving vertically downwards through the soil to the subsoil an elongated casing having a lid with one portion of the lid pivoted to one end of said casing so that said lid is at the bottom and an open end of the casing is at the top, said lid having at least a second portion substantially opposite said pivoted portion extending outwards from the circumference of said lid in a plane substantially normal to the direction of elongation of said casing, there being inserted into said casing a continuous cellular foamed synthetic resinous drain material; and, b. withdrawing the casing from the subsoil, the pressure of said subsoil on said extending portion causing the lid to pivot open, so that said casing can be slipped out of the subsoil and soil leaving the drain material in place extending from the subsoil to the soil.

2. A method as claimed in claim 1 wherein said casing is first inserted into the subsoil and said drain material is then placed into said casing.

5. A method as claimed in claim 2 wherein simultaneously with the withdrawal of said casing, compressed air is directed from above onto said drain material to maintain said drain material in place during the removal of said casing.

6. A method as claimed in claim 3 wherein simultaneously with the withdrawal of said casing, compressed air is directed from above onto said drain material to maintain said drain material in place during the removal of said casing.

7. A method as claimed in claim 1 wherein a weight is placed at the bottom of said drain material prior to being inserted into said casing so as to maintain said drain material in place during removal of said casing.