US4647256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing underground pipes
Assignee: Ed Zueblin AG
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Filing: 1985-02-28
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Granted: 1987-03-03
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Expires: 2005-02-28
Abstract
Abstract A method of producing underground pipes, with pipe sections being pressed ahead into the ground. For each pipe section, at least two partial pipe shells are used which are separated from one another in the longitudinal direction, and are joined about supply lines which are guided through the pipe. The joining process is effected before the pipe section is pressed into the ground. With this method, the supply lines do not have to be interrupted when a new pipe section is introduced. The apparatus for carrying out the method is provided with at least one joining station for joining the partial pipe shells in a precisely fitting manner, and a combining station for interconnecting the partial pipe shells.
Inventors
- 👤 Volker Hahn
- 👤 Eberhard Beitinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:08
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/04; E21D11/08; E21D11/083; E21D9/00; E21D9/005; F; F16; F16L; F16L9/00; F16L9/22; Y; Y10; Y10S; Y10S138/00; Y10S138/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A method of producing an underground pipe by pressing pipe sections into the ground; the ground is loosened at the head of the pipe which is to be pressed ahead, and the loosened ground is conveyed backwards through the pipe for removal or processing; supply lines are run from the head of the pipe all the way through the individual pipe sections to the back; the improvement therewith which includes the steps of: using at least two partial pipe shells, which are separated from one another in the longitudinal direction, for each of said pipe sections of said pipe; joining said partial pipe shells together around said supply lines to form a pipe section; pressing said last-mentioned pipe section against the previously formed pipe section and into the ground; carrying out said joining step and the pressing of the previously formed pipe section at the same time, and moving said partial pipe shells in the direction of advancement at the same speed as said pressing speed.
Claim 2
Independent Claim
166 words
A method of producing an underground pipe by pressing pipe sections into the ground; the ground is loosened at the head of the pipe which is to be pressed ahead, and the loosened ground is conveyed backwards through the pipe for removal or processing; supply lines are run from the head of the pipe all the way through the individual pipe sections to the back; the improvement therewith which includes the steps of: using at least two partial pipe shells, which are separated from one another in the longitudinal direction, for each of said pipe sections of said pipe; joining said partial pipe shells together around said supply lines to form a pipe section; pressing said last-mentioned pipe section against the previously formed pipe section and into the ground; carrying out said joining step and the pressing of the previously formed pipe section at the same time, and moving said partial pipe shells in the direction of advancement at the same speed as said pressing speed.
Claim 3
Independent Claim
166 words
A method of producing an underground pipe by pressing pipe sections into the ground; the ground is loosened at the head of the pipe which is to be pressed ahead, and the loosened ground is conveyed backwards through the pipe for removal or processing; supply lines are run from the head of the pipe all the way through the individual pipe sections to the back; the improvement therewith which includes the steps of: using at least two partial pipe shells, which are separated from one another in the longitudinal direction, for each of said pipe sections of said pipe; joining said partial pipe shells together around said supply lines to form a pipe section; pressing said last-mentioned pipe section against the previously formed pipe section and into the ground; combining said pipe sections with said pipe prior to said pressing step, and continuously advancing said pipe while at the same time attaching further pipe sections to that end of said pipe remote from said head thereof.
Claim 4
Independent Claim
166 words
A method of producing an underground pipe by pressing pipe sections into the ground; the ground is loosened at the head of the pipe which is to be pressed ahead, and the loosened ground is conveyed backwards through the pipe for removal or processing; supply lines are run from the head of the pipe all the way through the individual pipe sections to the back; the improvement therewith which includes the steps of: using at least two partial pipe shells, which are separated from one another in the longitudinal direction, for each of said pipe sections of said pipe; joining said partial pipe shells together around said supply lines to form a pipe section; pressing said last-mentioned pipe section against the previously formed pipe section and into the ground; combining said pipe sections with said pipe prior to said pressing step, and continuously advancing said pipe while at the same time attaching further pipe sections to that end of said pipe remote from said head thereof.
Claim 5
Dependent Claim
20 words
A method according to claim 2, which includes the step of using two half pipe shells for each pipe section.
Claim 6
Dependent Claim
29 words
A method according to claim 2, which includes the steps of fixing said partial pipe shells in a precisely fitting manner to interconnect them, and subsequently filling joint spaces.
Claim 7
Dependent Claim
40 words
A method according to claim 2, which includes the steps of providing partial pipe shells made of a material selected from the group consisting of metals and plastics, and thermally interconnecting said partial pipe shells prior to said pressing step.
Claim 8
Dependent Claim
46 words
A method according to claim 2, which includes the steps of providing each of said partial pipe shells with longitudinally extending faces, applyin an adhesive to said faces, and joining said partial pipe shells together in a precisely fitting manner to form a complete pipe section.
Claim 9
Dependent Claim
43 words
A method according to claim 6, which, to reduce the hardening time of the adhesive and/or to increase the strength of the adhesive, includes the step of applying heat in the region of said faces, with or without the additional application of pressure.
References Cited (Backward Citations)
CA634612A
Cited
US2005699A
Cited
US3107741A
Cited
US4075300A
Cited
US4094152A
Cited
US4200480A
Cited
US4314775A
Cited
US4343573A
Cited
US4400108A
Cited
GB2128709A
Cited
US4534676A
Cited
US4571122A
Cited
US4564314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |