US3902322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drain pipes for preventing landslides and method for driving the same
Assignee: Individual
•
Filing: 1973-08-27
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Granted: 1975-09-02
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Expires: 1993-08-27
Abstract
Abstract A drain pipe is disclosed which comprises a drain pipe section provided with a plurality of weep holes or slots and a shielding pipe section slidably fitted over the drain pipe section and adapted to remain in such a position with respect to the drain pipe section as to completely shield the weep holes or slots thereof when driven into the ground. After the drain pipe section has been driven into a predetermined depth, the shielding pipe section is further driven into the ground while the drain pipe section remains stationary, so that the weep holes or slots are exposed to a cylinderical cavity left therearound by the shielding pipe section.
Inventors
- 👤 Hikoitsu Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:37
CPC Classifications
E; E02; E02B; E02B11/00; E02D; E02D17/00; E02D17/20; E02D3/00; E02D3/02; E02D3/10; E02D3/103; E02D7/00; E02D7/02; E02D7/06; E21; E21B; E21B15/00; E21B15/006; E21B7/00; E21B7/04; E21B7/046
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
150 words
A drain unit for draining a sloping ground formation and thus preventing landslides due to excess ground water by installing said drain unit at a slight upward inclincation relative to the horiZontal, comprising a drain pipe having a plurality of circumferentially distributed openings and adapted to be driven into the sloping ground at said inclination; a shielding pipe telescoped over and slidably surrounding said drain pipe and covering said openings thereof; and connecting means connecting the telescoped-together pipes for joint driving thereof at said inclination into the sloping ground formation to a desired depth, and for thereafter driving said shielding pipe alone beyond said desired depth so as to displace said shielding pipe forwardly with reference to said drain pipe and expose said opening while leaving about said drain pipe in the region of said openings an annular clearance in which the soil is substantially spaced from said drain pipe.
Claim 2
Dependent Claim
150 words
A drain unit for draining a sloping ground formation and thus preventing landslides due to excess ground water by installing said drain unit at a slight upward inclincation relative to the horiZontal, comprising a drain pipe having a plurality of circumferentially distributed openings and adapted to be driven into the sloping ground at said inclination; a shielding pipe telescoped over and slidably surrounding said drain pipe and covering said openings thereof; and connecting means connecting the telescoped-together pipes for joint driving thereof at said inclination into the sloping ground formation to a desired depth, and for thereafter driving said shielding pipe alone beyond said desired depth so as to displace said shielding pipe forwardly with reference to said drain pipe and expose said opening while leaving about said drain pipe in the region of said openings an annular clearance in which the soil is substantially spaced from said drain pipe.
Claim 3
Independent Claim
120 words
A method of preventing landslides by draining water from sloping ground, comprising the steps of driving into the sloping ground at an upward angle relative to the horizontal an assembly composed of a drain pipe having apertures, and a shielding pipe telescoped over said drain pipe and covering said apertures; discontinuing driving of said assembly when the same has reached a desired depth; and thereafter driving said shielding pipe alone deeper into the ground so as to axially displace said shielding pipe relative to and forwardly of said drain pipe to thereby expose said apertures in the drain pipe while simultaneously forming an annular clearance about the drain pipe in which the soil is substantially spaced from said drain pipe.
Claim 4
Independent Claim
120 words
A method of preventing landslides by draining water from sloping ground, comprising the steps of driving into the sloping ground at an upward angle relative to the horizontal an assembly composed of a drain pipe having apertures, and a shielding pipe telescoped over said drain pipe and covering said apertures; discontinuing driving of said assembly when the same has reached a desired depth; and thereafter driving said shielding pipe alone deeper into the ground so as to axially displace said shielding pipe relative to and forwardly of said drain pipe to thereby expose said apertures in the drain pipe while simultaneously forming an annular clearance about the drain pipe in which the soil is substantially spaced from said drain pipe.
Claim 5
Dependent Claim
51 words
A method as defined in claim 2; and further comprising the step of drilling weep-holes into the sloping ground in substantially vertical direction, and filling said weep-holes with sand, so as to improve the permeability of the ground to water and facilitate the run-off of the water into said drain pipe.
Claim 6
Dependent Claim
151 words
A drain unit for draining a sloping ground formation and thus preventing landslides due to excess ground water by installing said drain unit at a slight upward inclinations relative to the horizontal, comprising a drain pipe having a plurality of circumferentially distributed slots and adapted to be driven into the sloping ground at said inclinations; a shielding pipe telescoped over and slidably surrounding said drain pipe and covering said slots thereof; and connecting means connecting the telescoped-together pipes for joint driving thereof at said inclinations into the sloping ground formation to a desired depth, and for thereafter driving said shielding pipe alone beyond said desired depth so as to displace said shielding pipe forwardly with reference to said drain pipe and expose said said slots while leaving about said drain pipe in the region of said slots an annular clearance in which the soil is substantially spaced from said drain pipe.
Claim 7
Dependent Claim
151 words
A drain unit for draining a sloping ground formation and thus preventing landslides due to excess ground water by installing said drain unit at a slight upward inclinations relative to the horizontal, comprising a drain pipe having a plurality of circumferentially distributed slots and adapted to be driven into the sloping ground at said inclinations; a shielding pipe telescoped over and slidably surrounding said drain pipe and covering said slots thereof; and connecting means connecting the telescoped-together pipes for joint driving thereof at said inclinations into the sloping ground formation to a desired depth, and for thereafter driving said shielding pipe alone beyond said desired depth so as to displace said shielding pipe forwardly with reference to said drain pipe and expose said said slots while leaving about said drain pipe in the region of said slots an annular clearance in which the soil is substantially spaced from said drain pipe.
Claim 8
Dependent Claim
32 words
A drain unit as defined in claim 4; and further comprising soil-displacing means mounted on a leading end of said drain pipe when said pipes are jointly being driven into the ground.
Claim 9
Dependent Claim
40 words
A drain unit as defined in claim 4; and further comprising a string of extension pipes for extending the length of said drain pipe; and coupling means for coupling said extension pipes to one another and to said drain pipe.
Claim 10
Dependent Claim
198 words
A drain unit for draining a sloping ground formation and this preventing landslides due to excess ground water by installing said drain unit at a slight upward inclinations relative to the horizontal, comprising a drain pipe having a plurality of circumferentially distributed openings and adapted to be driven into the sloping ground at said inclinations, said openings being equi-angularly spaced about said drain pipe and extending from a trailing end towards a leading end thereof; a shielding pipe telescoped over and slidably surrounding said drain pipe and covering said openings thereof; and connecting means connecting the telescoped-together pipes for joint driving thereof at said inclination into the sloping ground formatioN to a desired depth, and for thereafter driving said shielding pipe alone beyond said desired depth so as to displace said shielding pipe forwardly with reference to said drain pipe and expose said openings while leaving about said drain pipe in the region of said openings an annular clearance in which the soil is substantially spaced from said drain pipe, said connecting means comprising a member mounted on the rear end of said shielding pipe and having fins slidably received in the respective openings of said drain pipe.
Claim 11
Dependent Claim
198 words
A drain unit for draining a sloping ground formation and this preventing landslides due to excess ground water by installing said drain unit at a slight upward inclinations relative to the horizontal, comprising a drain pipe having a plurality of circumferentially distributed openings and adapted to be driven into the sloping ground at said inclinations, said openings being equi-angularly spaced about said drain pipe and extending from a trailing end towards a leading end thereof; a shielding pipe telescoped over and slidably surrounding said drain pipe and covering said openings thereof; and connecting means connecting the telescoped-together pipes for joint driving thereof at said inclination into the sloping ground formatioN to a desired depth, and for thereafter driving said shielding pipe alone beyond said desired depth so as to displace said shielding pipe forwardly with reference to said drain pipe and expose said openings while leaving about said drain pipe in the region of said openings an annular clearance in which the soil is substantially spaced from said drain pipe, said connecting means comprising a member mounted on the rear end of said shielding pipe and having fins slidably received in the respective openings of said drain pipe.
Claim 12
Independent Claim
158 words
A method of preventing landslides by draining water from sloping ground, comprising the steps of providing a drain pipe assembly composed of a drain pipe having apertures, and a shielding pipe telescoped over said drain pipe and covering said apertures; suspending said drain pipe at two axially spaced locations thereof in a substantially horizontal orientation, so that said drain pipe can perform axial swinging movements; executing blows upon a trailing end of said drain pipe for driving said head and drain pipe substantially horizontally into the sloping ground; discontinuing driving of said assembly when the same has reached a desired depth; and thereafter driving said shielding pipe alone deeper into the ground so as to axially displace said shielding pipe relative to and forwardly of said drain pipe to thereby expose said apertures in the drain pipe while simultaneously forming an annular clearance about the drain pipe in which the soil is substantially spaced from said drain pipe.
Claim 13
Independent Claim
158 words
A method of preventing landslides by draining water from sloping ground, comprising the steps of providing a drain pipe assembly composed of a drain pipe having apertures, and a shielding pipe telescoped over said drain pipe and covering said apertures; suspending said drain pipe at two axially spaced locations thereof in a substantially horizontal orientation, so that said drain pipe can perform axial swinging movements; executing blows upon a trailing end of said drain pipe for driving said head and drain pipe substantially horizontally into the sloping ground; discontinuing driving of said assembly when the same has reached a desired depth; and thereafter driving said shielding pipe alone deeper into the ground so as to axially displace said shielding pipe relative to and forwardly of said drain pipe to thereby expose said apertures in the drain pipe while simultaneously forming an annular clearance about the drain pipe in which the soil is substantially spaced from said drain pipe.
Claim 14
Dependent Claim
32 words
A method as defined in claim 8, wherein the step of suspending comprises suspending said drain pipe so that said leading end hangs at a slight upward inclination relative to the horizontal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |