US3758940A - Method of producing composite concrete - steel pipes and joints and pipe and joint obtained by means of said method - Google Patents

Method of producing composite concrete - steel pipes and joints and pipe and joint obtained by means of said method Download PDF

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US3758940A
US3758940A US00415561A US3758940DA US3758940A US 3758940 A US3758940 A US 3758940A US 00415561 A US00415561 A US 00415561A US 3758940D A US3758940D A US 3758940DA US 3758940 A US3758940 A US 3758940A
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Prior art keywords
sleeve
concrete
pipe
mould
wall
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US00415561A
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J Lamy
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SEGANS
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SEGANS
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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
    • B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L17/00—Joints with packing adapted to sealing by fluid pressure
    • F16L17/10—Joints with packing adapted to sealing by fluid pressure the packing being sealed by the pressure of a fluid other than the fluid in or surrounding the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00
    • F16L25/0027—Joints for pipes made of reinforced concrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/153—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and concrete with or without reinforcement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49888—Subsequently coating

Definitions

  • the internal pressure is removed and the pipe is then subjected to radial, transverse and longitudinal compressive stresses owing to the tension of the reinforcements.
  • Such pipes are suitable, for example, for irrigation pipe-lines or forced-supply conduits but can not be used in their normal state for transporting liquid or gaseous hydrocarbons.
  • the object of the invention is to provide a method of producing composite concrete-steel pipes, for example pipes of vary large diameter capable of withstanding high pressures, which it is not possible to obtain at the present time with weldable steel grades available in the industry.
  • Another object of the invention is to provide a method of producing such pipes which are suitable for conducting hydrocarbons.
  • the invention provides a method of producing concrete-steel pipes and joints in which the concrete is subjected to a triple stress owing to a single internal pressure and which comprises injecting a colloidal concrete between a thin mild steel sleeve forming the inner wall of the pipe or joint, and an outer enclosure, said outer enclosure being either constituted by a concrete-drying removable shell structure provided with a clamping device, a winding of steel wire being in this case embedded in the concrete, or being part of the pipe, in which case the enclosure is constituted by a winding of contiguous coils, said winding performing the functions of a transverse prestressing hooping, a concrete drying means and a permanent outer enclosure.
  • Another object of the invention is to provide an apparatus for carrying out said method, said apparatus comprising in combination, handling devices for placing the skeleton of the pipe in position and for shifting the concrete steel pipe, closing means for closing the ends of the annular chamber receiving the injection of concrete and closing the inner sleeve of the pipe, a vessel for injecting the concrete under pressure, connecting means connecting the vessel to the annular chamber, a source of water under pressure, connecting means connecting the source to the inner space of the sleeve and a press for maintaining the pipe closed during the application of said internal pressure.
  • a further object of the invention is to provide a pipe and a joint permitting straight or other pipe connections, said pipe or joint being of the composite concrete-steel type and comprising a mild steel inner collar and an outer mass of concrete and an outer winding having contiguous coils in which the concrete is subjected to a triple stress created by a single internal pressure.
  • FIG. 1 is a partial cross-sectional view of a first embodiment of a composite concrete-steel pipe according to the invention, this pipe having embedded coils;
  • FIG. 2 is a longitudinal half-sectional view of said pipe, taken along the broken line 2-2 of FIG. 1;
  • FIG. 3 is a partial perspective view of a detail of the ribbing of the sleeves
  • FIG. 4 is a longitudinal elevational view partly in section, of the station at which the concrete is injected and the mixed pipe extracted;
  • FIG. 5 is a cross-sectional view of said injection and extraction station
  • FIG. 6 is a partial cross-sectional view of a second embodiment of a compostie concrete-steel pipe having contiguous coils according to the invention.
  • FIG. 7 is a longitudinal sectional view, taken along the broken line 77 of FIG. 6, and
  • FIG. 8 is a partial longitudinal sectional view of a composite joint having contiguous coils for such composite pipes.
  • the composite concrete-steel pipe according to the invention comprises an inner sleeve 1, which can have, for example, a thickness of 5 mm and is constructed from extra mild steel sheets bent and welded together. These sheets constitute the inner wall of the composite concrete-steel pipes.
  • rib structures 2 consisting, for example, of two metal bars 2a, 2b which have a corrugated configuration and are welded to a longitudinal metal bar 2c.
  • the bars 2a and 2b can have, for example, a diameter of 5 mm and the bar 20 a diameter of 12 mm.
  • These bars are advantageously of the type employed in concrete structures and hardened by torsion, such as the bars known under the name Tor bars or other highly adherent bars of hardened steel.
  • These longitudinal rib structures can also be composed of thin bent sheet, for example having a thickness of 1.5 mm.
  • the aforementioned structure is preferred since it permits a better distribution of the concrete 3 which surrounds the bars, and as this rib structure is more deformable, the inner mild steel sleeve is not deformed thereby.
  • the sleeve receives at each end (FIG. 2) two apertured rims 3a, 3b between which extend the wires or rods 4 for producing the longitudinal pre-stressing. These wires are flattened at their ends and held in the rims by screwed sleeves 5 whereby it is possible to put the wires under tension.
  • windings 6 and 7 which are separated by a steel wire or rod 8 which can be disposed helically so as to maintain the spacing between said windings.
  • These windings can be composed of a single strand, two strands as shown in FIGS. 1 and 2, or several strands.
  • This hooping and the longitudinal Wires or cables are composed of hard steel wire of conventional type employed in pre-stressed concrete structures.
  • the equipped sleeve assembly just described is first constructed.
  • the production of the. pipe comprises the following 'stages.
  • This sleeve thus equipped constitutes a skeleton which is conducted by mechanical handling means to an injection station.
  • Such a winding machine is similar to a conventional winding machine, at least as concerns its principle of operation, and there is consequently no need to give a more detailed description thereof.
  • FIG. 4 The injection and extraction station 11 is shown in FIG. 4, in which reference numeral 12 designates one end of a hydraulic press annexed to this station, the assembly constituting the essential part of an apparatus for producing finished pipes from the ribbed and equipped sleeves 13 (FIG. 5) described hereinbefore.
  • the injection and extraction station comprises (FIG. 4) an assembly of two gantries 14a, 14b provided with winches 15a, 15b and movable along runways 16 (FIG. 5) between an injection vessel 17 and a horizontal hydraulic press 12.
  • the sleeve can be supported within these gantries at two points intermediate its ends by jacks 18, on mould-stripping jacks and at its ends by two jacks 19 on centering jacks, provided with rollers.
  • closing means 20 which are supported by carriages 21 which are movable along slideways 22 by hydraulic jacks 23 so that these closing means can be fitted onto the metal skeleton, namely the equipped sleeve 13.
  • closing means are connected by flexible pipes 24 to the injection vessel 17.
  • a drying or draining shell structure 25 (FIGS. 4 and 5) carried by a horizontal support bar 15c supported by the winches 15a, 15d of the gantries.
  • This shell structure is composed of two part-cylindrical segments, namely a median segment 25a, and two lateral segments 25b, 25c.
  • the shell structure 25 is suspended from the bar 150 by toggle devices 26 comprising links which are articulated in such manner that these toggle devices open when they are raised by the winches (position I shown in FIG. 5) and close when the central part of the toggle device descends and encounters the skeleton 13 (position II in FIG. 5).
  • the closure of the shell structures can be almost complete and can be completed by the action of two horizontal jacks 27.
  • the three parts of the drying or draining shell structure consist of staves of wood. When they are in the closed position on the sleeve they form the cylindrical outer wall of the mould whose cylindrical inner wall is formed by the sleeve, the plane end faces of the mould being formed by the closing means 20 which are consequently the mould ends; the closing means 20 are equipped with sealing elements so as to close the mould in a sealed manner.
  • These mould ends have concrete injection apertures which communicate with the annular chamber of the mould and a plurality of water inlets which are provided with stop valves and communicate with the chamber of the sleeve. Further, these various apertures are provided with closing valves of conventional type.
  • the concrete injection aperture or apertures are connected to the injection vessel 17 by the pipe or pipes 24, the water inlet aperture is connected to a source of water under pressure (not shown).
  • the mould ends have recesses which are so disposed and dimensioned as to be capable of accomodating the sleeves 5 (FIG. 2) when these mould ends are placed in position on the ends of the mould.
  • the draining or drying shell structure 25 can be hooped by means of binding cables 28 for example disposed in pairs in transverse planes. These cables are provided at their ends with tightening means such as threaded sleeves which can be tightened together by means of a screw having opposite threads and a ratchet lever or the like.
  • the press 12 constituting a part of the apparatus, comprises a fixed bench 29 and two horizontal clamping jacks 30 which are symmetrically opposed to one another.
  • the apparatus is completed by accessories such as shelters 31a, 31b and floors such as 32.
  • the apparatus is used and operates in the following manner.
  • a ready-made skeleton or ribbed reinforcement such as 13a (FIG. 5), is raised, brought to the position 13, and centered by the jacks 19 so as to make the axis of the skeleton coincide with the axis of the'mould ends and bring the sleeves 5 in alignment with their recesses by the sliding of the carriages 21 controlled by the jacks 23.
  • the mould ends are then fitted onto the skeleton.
  • the shell structure 25 fed by the gantries is lowered onto the skeleton, from the position I to the position [I shown in FIG. 5 after which the jacks 27 completely close the shell structure round the sleeve.
  • Colloidal concrete is then injected under compressed air pressure by way of the pipes 24.
  • the air pressure which is maintained for a few minutes, initiates the drying or draining of the liquid part of the concrete.
  • the assembly comprising the shell structure 25, the skeleton l3, and the mould ends 20 is conveyed by the gantries to the horizontal press 12 and placed between the two opposed clamping jacks 30.
  • the water inlet is then connected to a source of water under pressure, and the volume within the mild steel sleeve is filled with water, the pressure of which is raised progressively.
  • the shell structure 25 is returned to the injection station by the gantries, which roll along their rails 16, and
  • the jacks 27 open the shell structure which is lifted away by the gantries and thus releases the stoved pipe under which are placed two platforms 18a raised by the jacks 18.
  • the stoved pipe is then emptied of the water it contains under pressure and this results in a partial release of the stress in the steel wires having a high elastic limit and in the sleeve whose elastic limit was exceeded under the effect of the pressure. In this way, a triple stressing of the concrete is achieved.
  • the mould ends 20 are extracted from the pipe by the carriages 21 which are moved along their slideways 22 by the hydraulic jacks 23.
  • the finished pipe 33 having embedded coils is then rolled away.
  • a new skeleton is placed in front of the injection station and held by the centering jacks 19 while the platforms of the jacks l8 descend.
  • the pipe according to the invention can be constructed in accordance with another embodiment,
  • FIGS. 6 and 7 which differs from the first embodiment in that the hooping, instead of being obtained by means of non-contiguous coils 6 and 7 embedded in the concrete, is obtained by means of coils 41 which are mounted about longitudinal wires 20 as in the first embodiment but are in contiguous relation to each other so as to form a cylindrical outer wall covered by a protecting covering 42 which can be, for example, composed of an epoxy pitch or of a polyester resin reinforced with chopped glass fiber.
  • the rib structure (2a, 2b, 2c) is secured to the sleeve in the manner described with respect to the first em bodiment, then the contiguous coils 41 are wound under slight tension by a winding machine with a steel wire of the type employed in the conventional manner in pre-stressed concrete structures.
  • the longitudinal pre-stressing wires 4 and the sleeves 5 are mounted as in the first embodiment.
  • This winding having contiguous coils thereafter receives the protecting covering 42, the latter being applied when this pipe has just been extracted from the injection station and is still hot.
  • this pipe is placed by a centering system, for example, by means of jacks, between two face-plates, one of which is a driving face-plate and drives the pipe in rotation.
  • a carriage which moves along a generatrix simultaneously effects a scouring operation by sanding and the application of the covering.
  • the residual heat of said pipe having contiguous coils coming from the stoving is such that it accelerates the polymerisation of the covering and thus increases its effectiveness.
  • the finished pipe is then dried.
  • the scope of the invention also embraces a joint I (FIG. 8) whereby it is possible to interconnect two pipes T1, T2 of the type described hereinbefore.
  • This joint employs the bare end portions Ea, Eb of the sleeves 1a, lb of two pipes 2a, 2b which, in the case shown in FIG. 8, are pipes of the type having contiguous coils.
  • Such end portions which were utilized for fitting the mould ends, have not varied in diameter during the pressurizing of the pipe and still have the required dimensions. These end portions are fitted together with the aid of a suitable expansible inner collar and then welded at 51.
  • the annular joint J which surrounds the end portions Ea, Eb comprises an annular support 52 provided with an injection aperture 53, and a hooping 54 having contiguous coils.
  • the joint further comprises a flexible annular chamber 55 provided with an injection pipe 56 and surrounding a protecting ring 57.
  • This chamber can be a toric chamber or a rectilin ear chamber wound round the ring 57.
  • the joint further comprises a mass of poured concrete 58 and is preferably constructed on the site.
  • annular members (ring 57, toric chamber 55, annular support 53 and hooping 54) are slipped on one of the pipes prior to the coupling of the pipes and prior to the welding of the two sleeves la, lb.
  • the concrete 58 is thereafter injected, then the chamber 55 is filled with a hardening substance, such as the product known under the trade name of Brauthite, which is introduced under pressure by way of the pipe 56. This expands the chamber 55, the concrete undergoes an inner radial compression and is dried and furthermore puts the hooping 54 under tension.
  • the internal pressure is maintained until the substance filling the chamber 55 hardens.
  • the joint permits in most cases following the desired path for the pipe-line, irrespective of the sinuous nature of the pipe-line.
  • the longitudinal stress can be obtained without the longitudinal wires 4 by the following method which constitutes a variant of the invention.
  • the mould ends are fitted onto the sleeve and maintained in position by means of an automatic clamping by jacks disposed in a ring.
  • the internal hydraulic pressure then permits not only radially expanding the sleeve but also extending it longitudinally, this extension creating after the hardening of the concrete and the elimination of the hydraulic internal pressure, a longitudinal compression of this concrete and consequently a third stress.
  • the forces exerted on the mould ends must be wholly supported by the press 12 shown in FIG. 4 whereas in the previously-described methods of production the longitudinal steel wires 4 are capable of withstanding all or a part of the forces exerted on the mould ends depending on the number and cross section of these wires.
  • Method of producing a composite concrete-steel pipe comprising the steps of taking a thin mild steel sleeve to serve as the inner wall of the pipe, attaching metal reinforcing means to the outer face of said sleeve, forming an injecting mould about said sleeve by placing means acting as a moisture-permeable enclosure around said sleeve, said enclosure constituting the outer wall of said mould and said sleeve constituting the inner wall of said mould, injecting colloidal concrete into said mould, compressing the concrete before it has set by creating an internal hydraulic pressure in said sleeve so as to expand said sleeve beyond the elastic limit of said mild steel, releasing said hydraulic pressure in said sleeve after hardening of the concrete, and removing the resulting composite concrete-steel pipe comprising said concrete, said reinforcing means and said mild steel sleeve expanded against said concrete.
  • Method of producing a composite concrete-steel pipe compirsing the steps of taking a thin mild steel sleeve constituting the inner wall of the pipe, attaching reinforcing means to'the outer face of said sleeve, said reinforcing means comprising a winding of steel wire encompassing said sleeve, placing a removable concrete-drying shell structure around said sleeve and reinforcing means and combining said structure and said sleeve to constitute an injection mould, injecting colloidal concrete into said mould, compressing said concrete before it has set by hydraulically creating an internal pressure in said sleeve so as to expand said sleeve, releasing said pressure in said sleeve after hardening of said concrete, and removing from said shell structure the composite pipe thus constructed comprising said concrete, said reinforcing means and said sleeve attached to said reinforcing means.
  • Method of producing a composite concrete-steel pipe comprising the steps of: taking a thin mild steel sleeve constituting the inner wall of the pipe, attaching reinforcing means to the outer face of said sleeve, forming the outer wall of the pipe by surrounding said sleeve and reinforcing means by a winding of steel wire having contiguous coils, said outer wall being permeable to moisture and defining an annular space about said sleeve, closing said annular space to form an injection mould, injecting colloidal concrete into said mould, compressing said concrete before it has set by hydraulically creating an internal pressure in said sleeve, releasing said pressure in said sleeve after hardening of said concrete, and removing the resulting composite pipe comprising said outer wall of steel wire, said concrete, said reinforcing means and said sleeve attached to said reinforcing means.
  • Method of producing a composite concrete steel pipe comprising the steps of taking a thin mild steel sleeve constituting the inner wall of the pipe, fixing reinforcing means to the outer face of said sleeve, placing means acting as a moisture permeable enclosure around said sleeve, said enclosure performing the function of the outer wall of an injection mould and said sleeve performing the function of the inner wall of said mould, injecting colloidal concrete into said mould compressing the concrete before it has set by creating an internal hydraulic pressure in said sleeve so as to expand said sleeve, releasing said hydraulic pressure in said sleeve after hardening of the concrete, and removing the resulting composite concrete-steel pipe comprising said concrete, said reinforcing means and said steel sleeve fixed to said reinforcing means.
  • Method as claimed in claim 4 comprising creating said internal hydraulic pressure while allowing said sleeve to exapnd axially as well as diametrally, whereby the concrete is put under longitudinal compression after the setting of the concrete and elimination of said internal pressure.
  • Method of producing a pipe assembly comprising two composite concrete-steel pipes and a composite concrete-steel joint between said pipes, said method comprising producing each of said pipes by the following steps: taking a thin mild steel sleeve constituting the inner wall of the pipe, fixing metal reinforcing means to the outer face of said sleeve, placing a moisture permeable enclosure around said sleeve, said enclosure performing the function of the outer wall of an injection mould and said sleeve performing the function of the inner wall of said mould, with the end portions of said sleeve extending out of said enclosure, injecting colloidal concrete into said mould, compressing the concrete before it has set by creating with fluid means an internal pressure in said sleeve so as to expand said sleeve, releasing said pressure in said sleeve after the hardening of the concrete; placing a flexible annular container on one of said end portions of the sleeve of one of said pipes; fixing said one of said end portions to an end portion of the sle

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
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US00415561A 1963-11-25 1964-11-23 Method of producing composite concrete - steel pipes and joints and pipe and joint obtained by means of said method Expired - Lifetime US3758940A (en)

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CA (1) CA923832A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1584682C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1605055A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1293290A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL156083B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (8)

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US4633568A (en) * 1984-11-27 1987-01-06 Vianini Industria S.P.A. Method of manufacturing reinforced concrete pipe having an evenly distributed steel wire reinforcement
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
CN1317522C (zh) * 2005-06-23 2007-05-23 西安理工大学 一种scs组合式水电站压力埋管的设计方法
CN100376835C (zh) * 2005-03-25 2008-03-26 衡水长江预应力有限公司 大截面圆心应力抗震涵管及其制备工艺
CN102384506A (zh) * 2010-08-30 2012-03-21 博西华电器（江苏）有限公司 灶具底壳及带有该种底壳的灶具
US20150323104A1 (en) * 2014-05-12 2015-11-12 Hawkeye Concrete Products Co. Reinforced concrete pipe
CN108214866A (zh) * 2017-12-01 2018-06-29 共同科技开发有限公司 一种用于水泥桩转移的翻动轮

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FR2599461B1 (fr) * 1986-05-30 1989-10-27 Lyonnaise Etudes Entr Indles Corps tubulaire en beton arme de grandes dimensions, equipe d'une tole interieure d'etancheite
FR2745315B1 (fr) * 1996-02-26 1998-05-15 Dauron Francoise Procede de realisation d'un mur en beton coule entre deux parois collaborantes et moyens pour la mise en oeuvre du procede
CN103591393B (zh) * 2013-11-13 2015-12-02 武汉理工大学 一种玻璃钢预应力钢套筒混凝土管材及其制作方法
CN111761242B (zh) * 2020-07-01 2022-03-25 苏闽(张家港)新型金属材料科技有限公司 一种直径≤0.4mm超细超强高碳钢丝的焊接工艺
CN113334565A (zh) * 2021-05-08 2021-09-03 广东三和管桩股份有限公司 一种金刚桩的制备方法
CN118650726B (zh) * 2024-08-16 2024-11-26 安徽建工生态科技股份有限公司 一种智慧工地水泥管成型装置

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US2022622A (en) * 1930-09-24 1935-11-26 Truscon Steel Co Floor and beam construction
US1990156A (en) * 1932-12-15 1935-02-05 Leonie S Young Reenforced concrete joist
US2311358A (en) * 1940-11-25 1943-02-16 Baily Robert William Apparatus and method for molding concrete
US2474660A (en) * 1946-08-19 1949-06-28 Rocla Ltd Manufacture of prestressed concrete pipe and the like
US2582751A (en) * 1948-05-03 1952-01-15 Rocla Ltd Method of prestressing reinforced concrete pipes
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
US2754563A (en) * 1951-11-08 1956-07-17 American Pipe & Constr Co Runner ring
US3077008A (en) * 1959-05-01 1963-02-12 Fluor Corp Cooling tower stack assembly
US3260020A (en) * 1962-05-24 1966-07-12 Cie D Ingenieurs Et Technicien Concentric chambered prestressed unit
US3182109A (en) * 1962-08-17 1965-05-04 Gerald G Greulich Method of making prestressed concrete pavement
US3183572A (en) * 1963-09-23 1965-05-18 Fresno Valves Inc Holder for pipe forming device
US3172932A (en) * 1963-11-22 1965-03-09 Method of manufacturing a concrete plank

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633568A (en) * 1984-11-27 1987-01-06 Vianini Industria S.P.A. Method of manufacturing reinforced concrete pipe having an evenly distributed steel wire reinforcement
US4702282A (en) * 1984-11-27 1987-10-27 Vianini Industria S.P.A. Reinforced conventional concrete pipe having an evenly distributed steel wire reinforcement
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
CN100376835C (zh) * 2005-03-25 2008-03-26 衡水长江预应力有限公司 大截面圆心应力抗震涵管及其制备工艺
CN1317522C (zh) * 2005-06-23 2007-05-23 西安理工大学 一种scs组合式水电站压力埋管的设计方法
CN102384506A (zh) * 2010-08-30 2012-03-21 博西华电器（江苏）有限公司 灶具底壳及带有该种底壳的灶具
US20150323104A1 (en) * 2014-05-12 2015-11-12 Hawkeye Concrete Products Co. Reinforced concrete pipe
US10563794B2 (en) * 2014-05-12 2020-02-18 Fsc Technologies, Llc Reinforced concrete pipe
CN108214866A (zh) * 2017-12-01 2018-06-29 共同科技开发有限公司 一种用于水泥桩转移的翻动轮
CN108214866B (zh) * 2017-12-01 2019-10-01 邳州大唐商品混凝土有限公司 一种用于水泥桩转移的翻动轮

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NL6413659A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-09-25
DE1584682A1 (de) 1973-02-01
DE1584682C3 (de) 1975-07-10
CA923832A (en) 1973-04-03
NL156083B (nl) 1978-03-15
DE1584682B2 (de) 1974-12-05
FR1605055A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-01-12
GB1293290A (en) 1972-10-18

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