WO2008090244A1 - System for prestressing screws in a flanged coupling - Google Patents

System for prestressing screws in a flanged coupling Download PDF

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Publication number
WO2008090244A1
WO2008090244A1 PCT/ES2008/000004 ES2008000004W WO2008090244A1 WO 2008090244 A1 WO2008090244 A1 WO 2008090244A1 ES 2008000004 W ES2008000004 W ES 2008000004W WO 2008090244 A1 WO2008090244 A1 WO 2008090244A1
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WO
WIPO (PCT)
Prior art keywords
elongation
screws
joint
guarantee
prestressed
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Application number
PCT/ES2008/000004
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Spanish (es)
French (fr)
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WO2008090244B1 (en
Inventor
Guillermo Petri Larrea
José SANCHO RODRÍGUEZ
Original Assignee
Guillermo Petri Larrea
Sancho Rodriguez Jose
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Application filed by Guillermo Petri Larrea, Sancho Rodriguez Jose filed Critical Guillermo Petri Larrea
Publication of WO2008090244A1 publication Critical patent/WO2008090244A1/en
Publication of WO2008090244B1 publication Critical patent/WO2008090244B1/en

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Classifications

    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/04—Screwed connections specially modified in view of tensile load; Break-bolts for maintaining a tensile load
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts

Definitions

  • the present invention consists in preloading screws, or any other similar element, such as studs or bolts, using a traction method, instead of a conventional method based on tightening torques, by means of a mechanism composed of several pieces specifically designed for such finish.
  • the designed system, object of the present invention is very simple and will allow replacing those based on the use of tractors that preload the union from the tightening torque control that is applied to the different screws, which are well known devices in the market.
  • the procedure to guarantee the proper tightening of all the screws may make it necessary to apply, to each screw, the torque control tool on multiple occasions to counteract the influence of each tightening on the others.
  • the friction between the elements means that the precision of the preload introduced cannot be guaranteed, so that the dispersion of results between one and the other joints is very high.
  • any union can be prestressed in any place, without the need for electrical or compressed air installations, nor requiring high investments in machinery to apply large tightening torques or in expensive pretensioning tools to make the assemblies in the factories of production or in the operative sites, since the assembly according to the system that is advocated does not require precision in the tightening and can be carried out with hand tools (torque wrenches are not necessary). This implies a very important saving in investments, in salaries of specialized personnel and in logistics, maintenance and storage costs.
  • the safety coefficients with which the joints are calculated can be lowered and, therefore, they can be made with fewer joining elements, providing a capacity of equal or greater load and without risking too much the integrity of the joints. Therefore, the use of specially designed parts does not necessarily imply that the cost of the joint elements is more expensive.
  • the application of the own system of the invention can be valid under any weather condition, since it can be adapted to any temperature range of application and use. In fact, it is possible to achieve variable preloads with the ambient temperature for applications that could benefit from this phenomenon.
  • the basis of the invention is based on the use of a series of specifically designed components, which, properly assembled, make it possible to completely guarantee the preload defined for each individual joint in all the joints that are made , without significant loss of preload.
  • the system is valid for any type of union, being universal both in its function and in its use.
  • the desired elongation is achieved through a piece called a pretensioner support; one piece for elongation control, specifically designed and necessary for the preload of the union; of a base washer, and of one or several gauges or pieces, also specially designed for that purpose, which are the ones that will guarantee the indefinite maintenance of the absolute value of the corresponding elongation.
  • the assembly can also be left complete without gauges, supported by the pieces for elongation control or any other specifically designed for this purpose, and with its base washers also specially prepared for it.
  • Figure 1 shows a pretensioner support, a piece for elongation control and a base washer arranged for prestressing the corresponding screw.
  • Figure 2 a plan view of Figure 1 is shown.
  • Figure 3 the prestressed assembly with a gauge already inserted is shown.
  • Figure 4 a section IV-IV of Figure 3 is shown.
  • the base washer (3) is mounted and then the pretensioner bracket (2) is installed on which the pieces (1) will be mounted or preassembled for the control of the elongation, specifically designed and calculated for each type of diameter, length and design of the joint to be prestressed.
  • the elongation control parts (1) are operated until they stop in the pretensioner support (2), without the need for any torque control. When these pieces have reached the top, the union will have stretched the value set and calculated for each of them. As can be seen in Figure 5, this value is maintained by introducing a gauge (6) or any other element designed for the purpose of ensuring elongation and then the pieces used for this elongation control can be disassembled ( one). Such pieces may be used to make another joint of the same characteristics.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Connection Of Plates (AREA)
  • Lubricants (AREA)

Abstract

The invention relates to a system for prestressing the screws (4) in a flanged coupling (5). The invention includes a washer (3) and a nut (2) screwed to the end of each screw (4). The nut (2) is provided with several threaded axial holes into which screws extend (1) in order to apply an axial tensile force on the above-mentioned screw (4). Said force causes the elongation of the screw (4) and the formation of a cavity between the nut (2) and the washer (3), into which a gauge (6) of pre-determined thickness is inserted. Subsequently, the screws (1) are extracted with the elongation of each screw (4) and, consequently, the preload thereof being maintained by the thickness of the gauge (6).

Description

SISTEMA PARA GARANTIZAR LOS ESTIRAMIENTOS DE LOS TORNILLOS EN UNA UNIÓN EMBRIDADA Y PRETENSADA SYSTEM TO GUARANTEE SCREW STRETCHING IN AN EMBRIDITY AND PRETENSED UNION
La presente invención consiste en precargar tornillos, o cualquier otro elemento similar, como espárragos o pernos, utilizando al efecto un método de traccionado, en lugar de un método convencional basado en pares de apriete, mediante un mecanismo compuesto por varias piezas específicamente diseñadas para tal fin. ANTECEDENTES DE LA INVENCIÓNThe present invention consists in preloading screws, or any other similar element, such as studs or bolts, using a traction method, instead of a conventional method based on tightening torques, by means of a mechanism composed of several pieces specifically designed for such finish. BACKGROUND OF THE INVENTION
Por medio de este sistema se puede garantizar completamente que los elementos pretensados que intervienen en Ia unión queden perfectamente precargados, evitándose asi el problema de que Ia unión pueda zafarse o que, por un exceso de tracción, los medios de unión puedan terminar deteriorándose o rompiéndose.By means of this system it can be completely guaranteed that the prestressed elements that intervene in the union are perfectly preloaded, thus avoiding the problem that the joint can be released or that, due to excessive traction, the joining means can end up deteriorating or breaking .
El sistema diseñado, objeto de Ia presente invención, es muy sencillo y permitirá sustituir a los fundados en el uso de traccionadores que precargan Ia unión a partir del control de par de apriete que se aplica a los distintos tornillos, que son dispositivos ya muy conocidos en el mercado.The designed system, object of the present invention, is very simple and will allow replacing those based on the use of tractors that preload the union from the tightening torque control that is applied to the different screws, which are well known devices in the market.
La utilización del mecanismo pretensor que se preconiza, para practicar el sistema que se propone, supone Ia sustitución de los elementos roscados, a los que se les debe aplicar un elevado par de apriete que requiere Ia utilización de maquinaria pesada, de gran tamaño y difícilmente manejable y peligrosa, puesto que con el sistema descrito y reivindicado en Ia presente memoria, que formará parte de una solicitud de Patente deThe use of the pretensioning mechanism that is recommended, to practice the system that is proposed, supposes the replacement of the threaded elements, to which a high torque must be applied that requires the use of heavy machinery, large and difficult manageable and dangerous, since with the system described and claimed herein, it will be part of a patent application for
Invención, se consigue traccionar los elementos de cualquier unión, sin importar su tamaño, con herramientas sencillas, incluso manuales, dado que el mecanismo pretensor diseñado, para desarrollar el sistema que se propone, no requiere elementos de control de pares de apriete.Invention, it is possible to pull the elements of any union, regardless of their size, with simple tools, even manuals, since the designed pretensioning mechanism, to develop the proposed system, does not require control elements of tightening torques.
Con él, también se puede comprobar Ia relajación que haya podido tener una unión y, si fuere necesario, traccionarla de nuevo en otra ocasión posterior.With it, you can also check the relaxation that a union could have had and, if necessary, pull it again at a later time.
Hasta Ia fecha, Ia forma de unir los elementos de una unión era mediante traccionado por aplicación de un adecuado par de apriete. Cuando los elementos a unir son de grandes dimensiones, los utillajes para aplicar tal par presentan el serio inconveniente de ser muy pesados, poniendo en riesgo físico al manipulador de los mismos. Además, los medios de unión (normalmente, tornillos) puede resultar pretensados, pero no suficientemente precargados.To date, the way to join the elements of a joint was by pulling by applying a suitable tightening torque. When the elements to be joined are large, the tools for applying such a pair present the serious inconvenience of being very heavy, putting the manipulator at physical risk. In addition, the joining means (usually screws) may be prestressed, but not sufficiently preloaded.
Otra limitación del actual sistema de aplicación de Ia precarga, por medio de un par torsor, se^presenta cuando las partes de Ia unión están muy cercanas entre si, hecho éste que hace imposible utilizar las herramientas de aplicación de par por Ia limitación de espacio físico disponible, Io que obliga a Ia utilización de traccíonadores especiales, con Ia complejidad de su uso que ello lleva aparejada. Los traccionadores actuales se utilizan en grandes uniones para las cuales no existen máquinas o utillajes que permitan alcanzar el nivel requerido de precarga por el método del par de apriete. En estos traccionadores se debe controlar el par de apriete de cada una de las piezas que componen el sistema. Una vez todas ellas manipuladas individualmente, absorben el par de apriete correcto, y se sabe así que ya se ha alcanzado el nivel de tracción requerido para Ia unión.Another limitation of the current system of application of the preload, by means of a torque, occurs when the parts of the joint are very close together, made This makes it impossible to use the torque application tools due to the limitation of available physical space, which obliges the use of special tractors, with the complexity of their use that this entails. The current tractors are used in large joints for which there are no machines or tools that allow to reach the required level of preload by the tightening torque method. In these tractors, the tightening torque of each of the parts that make up the system must be controlled. Once all of them manipulated individually, they absorb the correct tightening torque, and it is known that the level of traction required for the joint has already been reached.
El procedimiento para garantizar el apriete adecuado de todos los tornillos puede hacer que sea necesario aplicar, a cada tornillo, Ia herramienta de control de par en múltiples ocasiones para contrarrestar Ia influencia de cada apriete sobre los demás. Además, el rozamiento entre los elementos hace que Ia precisión de Ia precarga introducida no pueda garantizarse, por Io que Ia dispersión de resultados entre unas y otras uniones resulta muy elevada.The procedure to guarantee the proper tightening of all the screws may make it necessary to apply, to each screw, the torque control tool on multiple occasions to counteract the influence of each tightening on the others. In addition, the friction between the elements means that the precision of the preload introduced cannot be guaranteed, so that the dispersion of results between one and the other joints is very high.
Con el sistema objeto de esta invención, se puede garantizar el pretensado de una unión a base del concurso de una pieza solidaria a Ia parte a traccionar, Ia cual, por medio del apriete de un número determinado de traccionadores de dimensiones específicas garantiza plenamente el pretensazo de Ia unión, sin que sea necesario ningún control de par de aprite. Como el rozamiento no tiene importancia en este sistema, se puede asegurar tanto Ia precarga introducida como un nivel muy reducido de dispersión entre uniones iguales.With the system object of this invention, it is possible to guarantee the prestressing of a joint based on the contest of a piece integral with the part to be tracted, which, by means of the tightening of a determined number of tractors of specific dimensions, fully guarantees the prestress of the union, without requiring any torque control. Since friction is not important in this system, both the preload introduced and a very low level of dispersion between equal joints can be ensured.
Con el sistema propuesto, se puede pretensar cualquier unión en cualquier lugar, sin que sean necesarias instalaciones eléctricas o de aire comprimido, ni precisar elevadas inversiones en maquinaria para aplicar grandes pares de apriete o en costosos utillajes pretensores para realizar los montajes en las factorías de producción o en los emplazamientos operativos, ya que el montaje de acuerdo con el sistema que se propugna no requiere precisión en los aprietes y puede realizarse con herramientas manuales (las llaves dinamométricas no son necesarias). Ello implica un ahorro muy importante en inversiones, en salarios de personal especializado y en costes logísticos, de mantenimiento y de almacenamiento.With the proposed system, any union can be prestressed in any place, without the need for electrical or compressed air installations, nor requiring high investments in machinery to apply large tightening torques or in expensive pretensioning tools to make the assemblies in the factories of production or in the operative sites, since the assembly according to the system that is advocated does not require precision in the tightening and can be carried out with hand tools (torque wrenches are not necessary). This implies a very important saving in investments, in salaries of specialized personnel and in logistics, maintenance and storage costs.
Por otra parte, dado que se tiene pleno control de Ia dispersión del pretensado, se pueden rebajar los coeficiente de seguridad con los que se calculan las uniones y, por Io tanto, éstas pueden realizarse con menos elementos de unión, aportando una capacidad de carga igual o superior y sin arriesgar demasiado Ia integridad de Ia uniones. Por ello, Ia utilización de piezas especialmente diseñadas no implica necesariamente que el coste del conjunto de los elementos de las uniones sea más caro. La aplicación del sistema propio de Ia invención puede ser válida bajo cualquier condición climatológica, puesto que se puede adaptar a cualquier rango de temperatura de aplicación y de utilización. De hecho, es posible conseguir precargas variables con Ia temperatura ambiente para aplicaciones que pudieran beneficiarse de este fenómeno.On the other hand, given that there is full control of the dispersion of the prestressing, the safety coefficients with which the joints are calculated can be lowered and, therefore, they can be made with fewer joining elements, providing a capacity of equal or greater load and without risking too much the integrity of the joints. Therefore, the use of specially designed parts does not necessarily imply that the cost of the joint elements is more expensive. The application of the own system of the invention can be valid under any weather condition, since it can be adapted to any temperature range of application and use. In fact, it is possible to achieve variable preloads with the ambient temperature for applications that could benefit from this phenomenon.
Con este sistema se puede controlar Ia relajación de Ia unión y su futuro reapriete, teniendo en cuenta que las uniones correspondientes son fácilmente montables y desmontables. Además se tiene Ia garantía de Ia no manipulación de las uniones, dado que las piezas que se utilizan para el control del alargamiento pueden ser desmontadas una vez aplicada Ia precarga requerida, tal y como se explica en e! apartado dedicado a Ia descripción detallada de una realización preferida. El sistema de Ia invención puede ajustarse a las necesidades específicas de cada unión utilizando tanto métodos de cálculo tradicional, implementados o no por ordenador, como procedimientos experimentales y de ensayo, gracias a Ia elevada repetitividad de las uniones obtenidas conforme a este sistema. DESCRIPCIÓN DE LA INVENCIÓN El fundamento de Ia invención está basado en el uso de una serie de componentes específicamente diseñados, los cuales, debidamente montados, hacen que se pueda garantizar completamente Ia precarga definida para cada unión individual en Ia totalidad de las uniones que se realicen, sin pérdida significativa de precarga. El sistema es válido para cualquier tipo de unión, siendo universal tanto en su función como en su utilización.With this system, the relaxation of the joint and its future retightening can be controlled, taking into account that the corresponding joints are easily mountable and removable. In addition, there is a guarantee of the non-manipulation of the joints, given that the parts used for the control of elongation can be disassembled once the required preload has been applied, as explained in e! section dedicated to the detailed description of a preferred embodiment. The system of the invention can be adjusted to the specific needs of each union using both traditional calculation methods, implemented or not by computer, as well as experimental and testing procedures, thanks to the high repeatability of the joints obtained according to this system. DESCRIPTION OF THE INVENTION The basis of the invention is based on the use of a series of specifically designed components, which, properly assembled, make it possible to completely guarantee the preload defined for each individual joint in all the joints that are made , without significant loss of preload. The system is valid for any type of union, being universal both in its function and in its use.
También, debidamente montado, se puede aplicar a uniones que ya están ejecutadas según montajes convencionales (por ejemplo con tornillos o espárragos normalizados), en las que, con un diseño convenientemente preparado, se pueden conseguir las mismas ventajas expuestas anteriormente para el sistema propuesto. La invención que se describe y reivindica consiste, en definitiva, en que con Ia utilización de las piezas diseñadas específicamente, para el fin que se persigue, se garantizan las precargas por medio del mantenimiento absoluto del alargamiento que se produce en los correspondientes elementos de Ia unión.Also, properly assembled, it can be applied to joints that are already executed according to conventional assemblies (for example with standardized screws or studs), in which, with a properly prepared design, the same advantages set forth above for the proposed system can be achieved. The invention described and claimed is, in short, that with the use of specifically designed parts, for the purpose that is pursued, the preloads are guaranteed by means of the absolute maintenance of the elongation that occurs in the corresponding elements of the Union.
El alargamiento buscado se logra a través de una pieza llamada de soporte pretensor; de una pieza para el control del alargamiento, específicamente diseñada y necesaria para Ia precarga de Ia unión; de una arandela base, y de una o varias galgas o piezas, también especialmente diseñadas al efecto, que son las que van a garantizar el mantenimiento indefinido del valor absoluto del correspondiente alargamiento. El montaje también puede dejarse completado sin galgas, apoyado en las piezas para el control de alargamiento o en cualesquiera otras específicamente diseñadas para tal fin, y con sus arandelas-base también especialmente preparadas para ello.The desired elongation is achieved through a piece called a pretensioner support; one piece for elongation control, specifically designed and necessary for the preload of the union; of a base washer, and of one or several gauges or pieces, also specially designed for that purpose, which are the ones that will guarantee the indefinite maintenance of the absolute value of the corresponding elongation. The assembly can also be left complete without gauges, supported by the pieces for elongation control or any other specifically designed for this purpose, and with its base washers also specially prepared for it.
Para cada unión atornillada se diseñarán específicamente sus componentes, dado que los alargamientos varían en función de los diámetros, longitudes, materiales y diseños de las uniones. Ello, no obstante, no excluye Ia posibilidad de utilizar piezas estándar. BREVE EXPLICACIÓN DE LAS FIGURASFor each bolted joint, its components will be specifically designed, since the elongations vary depending on the diameters, lengths, materials and designs of the joints. This, however, does not exclude the possibility of using standard parts. BRIEF EXPLANATION OF THE FIGURES
Seguidamente se explican las figuras relativas a una de las posibles materializaciones del sistema objeto de Ia presente invención. Son éstas: En Ia figura 1 , se muestra un soporte pretensor, una pieza para el control del alargamiento y una arandela-base dispuestos para el pretensado del correspondiente tornillo.The figures related to one of the possible materializations of the system object of the present invention are explained below. These are: Figure 1 shows a pretensioner support, a piece for elongation control and a base washer arranged for prestressing the corresponding screw.
En Ia figura 2, se muestra una vista en planta de Ia figura 1. En Ia figura 3, se representa el conjunto pretensado con una galga ya insertada. En Ia figura 4, se muestra una sección IV-IV de Ia Figura 3.In Figure 2, a plan view of Figure 1 is shown. In Figure 3, the prestressed assembly with a gauge already inserted is shown. In Figure 4, a section IV-IV of Figure 3 is shown.
En Ia figura 5, se muestra el conjunto montado y pretensado, ya sin Ia pieza para el control del alargamiento.In Figure 5, the assembled and prestressed assembly is shown, already without the part for elongation control.
En dichas figuras, con las referencias numéricas que aparecen en ellas, se indican los elementos siguientes: 1.- Pieza para el control del alargamiento.In these figures, with the numerical references that appear in them, the following elements are indicated: 1.- Piece for elongation control.
2.- Soporte pretensor. 3,- Arandela-base. 4.- Tornillo normalizado. 5.- Bridas. 6. -Galga de mantenimiento del alargamiento.2.- Support pretensioner. 3, - Base washer. 4.- Standard screw. 5.- Flanges. 6.-Maintenance elongation gage.
DESCRIPCIÓN DETALLADA DE UNA REALIZACIÓN PREFERIDADETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Según las figuras 1 a Ia 5, se realiza el pretensado de una unión embridada con dos bridas (5), con un tomillo normalizado (4), de cualquier diámetro, longitud y diseño.According to figures 1 to 5, the prestressing of a flanged joint with two flanges (5), with a standardized thyme (4), of any diameter, length and design is performed.
Para ello se monta Ia arandela-base (3) y, seguidamente, se instala el soporte pretensor (2) en el cual se montarán o irán premontadas las piezas (1) para el control del alargamiento, específicamente diseñadas y calculadas para cada tipo de diámetro, longitud y diseño de Ia unión a pretensar.For this, the base washer (3) is mounted and then the pretensioner bracket (2) is installed on which the pieces (1) will be mounted or preassembled for the control of the elongation, specifically designed and calculated for each type of diameter, length and design of the joint to be prestressed.
Una vez montadas, se actúa sobre las piezas de control de alargamiento (1) hasta que hacen tope en el soporte pretensor (2), sin necesidad de hacer ningún control de par de torsión. Cuando estas piezas han llegado a tope, Ia unión se habrá estirado el valor fijado y calculado para cada una de ellas. Como se aprecia en ia figura 5, este valor se mantiene introduciendo una galga (6) o cualquier otro elemento diseñado con el propósito de asegurar el alargamiento y, a continuación, se puede proceder al desmontaje de las piezas utilizadas para este control del alargamiento (1). Tales piezas podrán ser utilizadas para realizar otra unión de las mismas características. Once assembled, the elongation control parts (1) are operated until they stop in the pretensioner support (2), without the need for any torque control. When these pieces have reached the top, the union will have stretched the value set and calculated for each of them. As can be seen in Figure 5, this value is maintained by introducing a gauge (6) or any other element designed for the purpose of ensuring elongation and then the pieces used for this elongation control can be disassembled ( one). Such pieces may be used to make another joint of the same characteristics.

Claims

REIVINDICACIONES
1a.- Sistema para garantizar los estiramientos de los tomillos en una unión embridada y pretensada, caracterizado por que Ia precarga se introduce por medio de elementos adicionales permanentes y no permanentes que garantizan e! alargamiento de los tornillos de unión, o elementos similares, y Ia compresión de las bridas en Ia cuantía necesaria para Ia adquisición de esa precarga, Ia cual se introduce por Ia elongación relativa de dichos elementos de unión.1 .- system to guarantee the stretching of the screws in a flanged joint and prestressed, characterized in that preloading Ia is introduced by permanent and non - permanent additional elements that guarantee e! elongation of the connecting screws, or similar elements, and the compression of the flanges in the amount necessary for the acquisition of that preload, which is introduced by the relative elongation of said joining elements.
2a.- Sistema para garantizar los estiramientos de los tornillos en una unión embridada y pretensada, según reivindicación anterior, caracterizado por que los elementos adicionales permanentes son un soporte pretensor, una arandela-base y una galga de mantenimiento del alargamiento.2 .- system to guarantee the stretching of the screws in a flanged and prestressed joint according to previous claim, characterized in that additional elements are permanent support pretensioner, a washer-base and a feeler extension maintenance.
3a.- Sistema para garantizar los estiramientos de los tornillos en una unión embridada y pretensada, según reivindicaciones anteriores, caracterizado por que los elementos no permanentes se contraen a una pieza de control del alargamiento, Ia cual rosca dentro del soporte pretensor para alargar en una medida prefijada el correspondiente elemento de unión.3 .- system to guarantee the stretching of the screws in a flanged prestressed and binding according to previous claims, characterized in that the nonpermanent elements to a control part elongation contract, which thread into Ia pretensioner elongate support in a predetermined measure the corresponding joint element.
4a,- Sistema para garantizar los estiramientos de los tornillos en una unión embridada y pretensada, según reivindicaciones anteriores, caracterizado por que Ia elongación del respectivo elemento de unión permite colocar, entre el soporte pretensor y Ia ararandela- base, Ia galga de mantenimiento del alargamiento.4 a , - System to guarantee the stretching of the screws in a flanged and prestressed joint, according to previous claims, characterized in that the elongation of the respective joint element allows to place, between the pretensioner support and the base-washer, the maintenance gauge of elongation
5a - Sistema para garantizar los estiramientos de los tornillos en una unión embridada y pretensada, según reivindicaciones anteriores, caracterizado por que, una vez colocadas las galgas de mantenimiento del alargamiento, se pueden retirar Ia pieza de control del alargamiento, quedando Ia unión embridada, pretensada y en condiciones totalmente operativas. 5 a - System to guarantee the stretching of the screws in a flanged and prestressed joint, according to previous claims, characterized in that, once the elongation maintenance gauges are placed, the elongation control piece can be removed, leaving the flanged joint , prestressed and in fully operational conditions.
PCT/ES2008/000004 2007-01-26 2008-01-04 System for prestressing screws in a flanged coupling WO2008090244A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP200700221 2007-01-26
ES200700221A ES2303473B1 (en) 2007-01-26 2007-01-26 SYSTEM TO GUARANTEE SCREWS OF SCREWS IN AN EMBRIDITY AND PRETENSED UNION.

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WO2008090244A1 true WO2008090244A1 (en) 2008-07-31
WO2008090244B1 WO2008090244B1 (en) 2008-09-18

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TW (1) TW200809103A (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010036352A1 (en) 2008-09-23 2010-04-01 Quantalife, Inc Droplet-based assay system
EP3869052A1 (en) * 2020-02-20 2021-08-25 Siemens Gamesa Renewable Energy Innovation & Technology, S.L. Apparatus and method for providing a secure tension connection

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GB980090A (en) * 1960-09-29 1965-01-13 P & O Pilgrim Valve Ltd Improvements in or relating to nuts and bolts
US3462180A (en) * 1965-11-08 1969-08-19 P & O Pilgrim Valve Ltd Tensioning of bolts,studs and like screw-threaded members
GB1277610A (en) * 1968-12-10 1972-06-14 Burmeister & Wains Mot Mask Improvements in and relating to devices for clamping a bolt against a support or base
US4622730A (en) * 1984-03-30 1986-11-18 Rolf Steinbock Apparatus to mechanically stress a bolt-type fastener

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
GB980090A (en) * 1960-09-29 1965-01-13 P & O Pilgrim Valve Ltd Improvements in or relating to nuts and bolts
US3462180A (en) * 1965-11-08 1969-08-19 P & O Pilgrim Valve Ltd Tensioning of bolts,studs and like screw-threaded members
GB1277610A (en) * 1968-12-10 1972-06-14 Burmeister & Wains Mot Mask Improvements in and relating to devices for clamping a bolt against a support or base
US4622730A (en) * 1984-03-30 1986-11-18 Rolf Steinbock Apparatus to mechanically stress a bolt-type fastener

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010036352A1 (en) 2008-09-23 2010-04-01 Quantalife, Inc Droplet-based assay system
EP3869052A1 (en) * 2020-02-20 2021-08-25 Siemens Gamesa Renewable Energy Innovation & Technology, S.L. Apparatus and method for providing a secure tension connection

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TW200809103A (en) 2008-02-16
ES2303473B1 (en) 2009-05-21
WO2008090244B1 (en) 2008-09-18
ES2303473A1 (en) 2008-08-01

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