US2585446A - Process for the production of tubular objects of prestressed concrete - Google Patents

Process for the production of tubular objects of prestressed concrete Download PDF

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Publication number
US2585446A
US2585446A US663774A US66377446A US2585446A US 2585446 A US2585446 A US 2585446A US 663774 A US663774 A US 663774A US 66377446 A US66377446 A US 66377446A US 2585446 A US2585446 A US 2585446A
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United States
Prior art keywords
tube
concrete
pressure
production
exterior
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Expired - Lifetime
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US663774A
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English (en)
Inventor
Edwin Emil
Nilsen Nils Darre
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/18—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core elements
    • B28B21/20—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core elements using inflatable cores, e.g. having a frame inside the inflatable part of the core
    • B28B21/205—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core elements using inflatable cores, e.g. having a frame inside the inflatable part of the core having a rigid frame inside the inflatable part of the core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
    • B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
    • B28B21/62—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements circumferential laterally tensioned

Definitions

  • Difierent arrangements have been proposed for producing prestressedtubes with homogeneous conditions, as regards stresses including those in which the prestress is obtained by means of pressure or in other manner, while the concrete is still in a semi-plastic or semi-solid condition.
  • the present inventoin is based on the principle above named to provide a concrete tube unreinforced beforehand with a winding, and then by the special process characterising the invention to place an exterior concrete tube cast around the first one in such a way that after the hardening the tube as regards the stress condition becomes homogeneous and the prestress becomes the same in the exterior and the interior tube.
  • Figure 1 shows a diametrical section through aprimary concrete tube and the means tor-applying outward radial. pressure thereon.
  • Fig, 2 shows a top plan view," of a cylindrical casting mold? plate for the outer or cast on. concrete; tube.
  • Fig. 2a is a sideel'evation of the mold'jplate shown in Fig, 2'.
  • Fig- 3 shows an axial section of the primary tube with; the reinforcing wires in position thereagainst.
  • Fig. 4 shows the moldi'arrangelments for imparting pressure to boththe, interior and the exterior of the composite molded con crete tube.
  • the drawing shows a mould arrangement for imparting pressure to both the interior and the exterior of the composite mould concrete tube.
  • the finished cast primary concrete tube orccre l' which preferably is made of concrete of high quality is tightened in one way or anotherso that a certain inside pressure pr may be maintained.
  • the tightening is obtained by placing a lid 2 on each end of the tube core, through the axis of which an inlet 2a for pressure water or pressure gas is found.
  • This primary tube is now wound with a suitable reinforcement wire 4a in such a way that the tension in the wire during the winding is maintained constant substantially at its maximum (for piano wire up to 20,000 kg./cm.
  • the diameter of the wire and the number of windings per meter are determined in such a way that a high peripheric compressive stress 0'1 for instance kg/cm. results in the primary concrete tube core I.
  • the finished wound concrete primary tube I is then surrounded by a casting-mould, which preferably is made in a way to yield somewhat when subjected to pressure for instance by the overlapping of an elastic steel-plate 3.
  • the characteristic feature of the invention consists in, that before the exterior tube or covering 5 is cast around tube I, the latter is subjected to the pressure 321 above named from the inside.
  • This pressure is regulated in such a manner that the stress '01 in the concrete beapproximately 0, or in case a strongly shrinking concrete mass for the exterior tube is used, 121 is chosen so high that m will be slightly negative, i. e. the tube 1 is subjected to a small peripheric tension corresponding to that engendered in the exterior tube after hardening. It is a matter of course that this peripheric tension must be less than the tensile strength of the concrete mass used.
  • the exterior concrete'rnass or covering 5 is now cast into the mould provided by the exterior of the primary tube core I and the plate 3 by ramming or vibration and the hardening takes place in a natural way or is eventually accelerated by heating.
  • the pressure p; is maintained constant.
  • the pressure in the composite tube is released and a homogeneous stress of where s1 is the thickness of the tube, s2 is the thickness of the tube 5 and 0'2 is the average peripheric stress in the composite tube in the finished state.
  • a process for imparting peripheric, compressive prestress to a tubular object of concrete which comprises imparting compressive stress to a. prehardened concrete tube by winding therearound a highly prestressed wire in direct ,con-
  • each of the tubular elements of the composite tubular object will be under a peripheric compressive prestress which is substantially homogeneous throughout the composite wall of the tubular object.
  • a process for imparting peripheric, compressive prestress to a tubular object of concrete which comprises imparting compressive stress to a prehardened concrete tube c'ore' by wlnding therearound a highly prestressed wire in direct contact with the concrete tube, casting around said wire-stressed tube core and in contact therewith a tube covering of concrete adhering to the core and subjecting and maintaining during the hardening oi the covering, the bore of the inner.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US663774A 1943-11-24 1946-04-22 Process for the production of tubular objects of prestressed concrete Expired - Lifetime US2585446A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO2585446X 1943-11-24

Publications (1)

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US2585446A true US2585446A (en) 1952-02-12

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Application Number Title Priority Date Filing Date
US663774A Expired - Lifetime US2585446A (en) 1943-11-24 1946-04-22 Process for the production of tubular objects of prestressed concrete

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US (1) US2585446A (de)
DE (1) DE809168C (de)
FR (1) FR931739A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683914A (en) * 1948-08-11 1954-07-20 Tangerois Ets Method of making reinforced concrete tanks
US2709845A (en) * 1951-06-29 1955-06-07 Rocla Pipes Ltd Method of applying pressure to the surface of newly formed concrete or like cementitious products
US2771655A (en) * 1951-11-27 1956-11-27 Nervi Pier Luigi Process of manufacture of forced pipings made of precompressed concrete, and relative equipment
US2892239A (en) * 1952-06-19 1959-06-30 Neff Wallace Improved method of erecting shellform concrete structures
US3056183A (en) * 1958-12-17 1962-10-02 Entpr S Campenon Bernard Process for the production of lined prestressed concrete hollow bodies
US3950465A (en) * 1972-07-27 1976-04-13 Amey Roadstone Corporation Limited Concrete pipes
US4771530A (en) * 1987-04-08 1988-09-20 General Atomics Application of inwardly directed prestressing pressure to concrete members
US4840200A (en) * 1983-06-21 1989-06-20 General Atomics Prestressed tube
US4936006A (en) * 1989-03-01 1990-06-26 General Atomics Method of making prestressed concrete articles
US5065795A (en) * 1989-03-01 1991-11-19 General Atomics Prestressed concrete articles

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1413405A (en) * 1921-06-27 1922-04-18 William S Hewett Reenforced-concrete pipe
US1471990A (en) * 1921-08-31 1923-10-23 Cyrus S Wert Method of forming faced concrete blocks
US1570794A (en) * 1922-02-20 1926-01-26 Robert C Stubbs Process of bonding new concrete formations to old concrete formations
US1965748A (en) * 1933-02-04 1934-07-10 Robert W Mitchell Composite pipe and method of making same
US2048253A (en) * 1933-02-10 1936-07-21 Freyssinet Eugene Method and apparatus for the manufacture of hollow bodies of reenforced concrete
US2153741A (en) * 1936-12-14 1939-04-11 Walter H Cobi Process of making reinforced hollow slabs
US2191025A (en) * 1934-12-22 1940-02-20 Robert W Mitchell Method of making composite pipes
US2236107A (en) * 1938-03-04 1941-03-25 Joseph E Miller Concrete pipe

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1413405A (en) * 1921-06-27 1922-04-18 William S Hewett Reenforced-concrete pipe
US1471990A (en) * 1921-08-31 1923-10-23 Cyrus S Wert Method of forming faced concrete blocks
US1570794A (en) * 1922-02-20 1926-01-26 Robert C Stubbs Process of bonding new concrete formations to old concrete formations
US1965748A (en) * 1933-02-04 1934-07-10 Robert W Mitchell Composite pipe and method of making same
US2048253A (en) * 1933-02-10 1936-07-21 Freyssinet Eugene Method and apparatus for the manufacture of hollow bodies of reenforced concrete
US2191025A (en) * 1934-12-22 1940-02-20 Robert W Mitchell Method of making composite pipes
US2153741A (en) * 1936-12-14 1939-04-11 Walter H Cobi Process of making reinforced hollow slabs
US2236107A (en) * 1938-03-04 1941-03-25 Joseph E Miller Concrete pipe

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683914A (en) * 1948-08-11 1954-07-20 Tangerois Ets Method of making reinforced concrete tanks
US2709845A (en) * 1951-06-29 1955-06-07 Rocla Pipes Ltd Method of applying pressure to the surface of newly formed concrete or like cementitious products
US2771655A (en) * 1951-11-27 1956-11-27 Nervi Pier Luigi Process of manufacture of forced pipings made of precompressed concrete, and relative equipment
US2892239A (en) * 1952-06-19 1959-06-30 Neff Wallace Improved method of erecting shellform concrete structures
US3056183A (en) * 1958-12-17 1962-10-02 Entpr S Campenon Bernard Process for the production of lined prestressed concrete hollow bodies
US3950465A (en) * 1972-07-27 1976-04-13 Amey Roadstone Corporation Limited Concrete pipes
US4840200A (en) * 1983-06-21 1989-06-20 General Atomics Prestressed tube
US4771530A (en) * 1987-04-08 1988-09-20 General Atomics Application of inwardly directed prestressing pressure to concrete members
WO1988007934A1 (en) * 1987-04-08 1988-10-20 General Atomics Prestressed concrete articles and methods for manufacturing such articles
US4936006A (en) * 1989-03-01 1990-06-26 General Atomics Method of making prestressed concrete articles
US5065795A (en) * 1989-03-01 1991-11-19 General Atomics Prestressed concrete articles

Also Published As

Publication number Publication date
FR931739A (fr) 1948-03-02
DE809168C (de) 1951-07-23

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