MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
ÍNDICE 1.
INTRODUCCIÓN.
2.
PLANIFICACIÓN
DEL
TRABAJO
Y
DOCUMENTACIÓN
NECESARIA. 3.
ANTES DE INICIAR LA MARCHA.
4.
CONDUCIR LA GRÚA HASTA EL LUGAR DE TRABAJO O DESDE ESTE A LA BASE.
5.
LLEGADA AL LUGAR DE TRABAJO.
6.
MONTAJE DE LA GRÚA MÓVIL.
7.
TRABAJAR CON LA GRÚA MÓVIL.
8.
DESMONTAJE DE LA GRÚA MÓVIL.
9.
DESPUÉS DE LA JORNADA DE TRABAJO.
10. ANEXOS: ANEXO I.- TRABAJOS EN PROXIMIDAD DE LÍNEAS AEREAS DE ALTA TENSIÓN. ANEXO II.- SEÑALISTA ANEXO III.- TRABAJOS CON CESTAS PORTAPERSONAS PORTAPERSONAS ANEXO IV.- DESPLAZAMIENTO CON CARGA Y OPERACIONES CON MÁS DE UNA GRÚA 11. BIBLIOGRAFÍA
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
1. INTRODUCCIÓN 1.1. La
Definiciones. Partes de la máquina.
ITC-MIE-AEM-4 del Reglamento de Aparatos de Elevación y Manutención referente a
“Grúas Móviles Autopropulsadas” establece la siguiente definición:
Grúa Móvil Autopropulsada: aparato de elevación de funcionamiento discontinuo, destinado a elevar y distribuir en el espacio cargas suspendidas de un gancho o cualquier otro accesorio de aprehensión, dotado de medios de propulsión y conducción propios o que formen parte de un conjunto con dichos medios que posibilitan su desplazamiento por vías públicas o terrenos.
En general, en una grúa Grúa Móvil Autopropulsada podemos distinguir las siguientes partes:
•
Estructura giratoria: Estructura orientable capaz de soportar la pluma, contrapeso y todos los mecanismos de accionamiento de la grúa. No aloja necesariamente a los mecanismos de traslado de la grúa. Sus principales componentes son:
-
Pluma: Es el componente estructural de la grúa encargado de soportar el órgano de aprehensión (gancho, electroimán,...) cargado, asegurando el alcance o radio y altura de elevación solicitados. Pueden ser de celosía, telescópicas o pluma sobre mástil.
-
Plumines: Son elementos que se añaden a la pluma para permitir mayor alcance y aumentar la longitud de la pluma de la grúa. Pueden ser abatibles o fijos.
-
Órgano de aprehensión: Dispositivo (gancho, cuchara, electroimán, etc.) que sirve para suspender, coger o soportar la carga.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
-
Aparejo: Sistema de poleas y de cables destinado a hacer variar las fuerzas y velocidades.
-
Mecanismo de elevación (Cabestrante): Es el conjunto de tambor y cables que permiten el movimiento de elevación.
-
Contrapesos: Masas fijadas sobre la estructura y encargadas de equilibrar las acciones de la carga.
-
Cabina del gruísta: Es el habitáculo destinado al manejo y/o conducción de la grúa y que alberga los mandos y al operador.
•
Corona de orientación: Esta compuesta por elementos y engranajes destinados a transmitir los esfuerzos (momentos de carga, fuerzas horizontales y verticales) de la estructura giratoria a la base de la grúa y que es accionado por el mecanismo de orientación de la estructura giratoria. Permite la rotación de la estructura giratoria en un plano horizontal.
•
Chasis o base portante de la grúa: Dispositivo capaz de soportar toda la estructura de la grúa. Dispone de sistemas propios de propulsión para poderse trasladar mediante ruedas, cadenas u otros sistemas, así como de estabilizadores que aumentan la superficie de apoyo y de elementos de apoyo que transmiten los esfuerzos al terreno.
PLUMA
CABINA
CONTRAPESO
CHASIS
GANCHO
ESTABILIZADORES
ESTRUCTURA GIRATORIA
Fig. 1.2 Partes principales de una grúa
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
1.2. •
Principales sistemas de seguridad.
Indicador de longitud de pluma: dispositivo que permite la lectura, desde la cabina del operador, de la longitud longitud de pluma en cada momento para aquellas grúas equipadas con pluma telescópica.
•
Indicador del ángulo de pluma: dispositivo de seguridad que permite la lectura, desde la cabina del operador, del ángulo de inclinación de la pluma en cada momento respecto de la horizontal.
•
Indicador de radio o alcance: dispositivo de seguridad que permite la lectura, desde la cabina del conductor, del radio con el que se está trabajando en cada momento.
•
Válvulas de retención: Evitan movimientos incontrolados (de elevación, inclinación,...) de la pluma en caso de rotura o avería en las tuberías flexibles de conexión.
•
Indicador de carga en gancho: dispositivo que permite la lectura, desde la cabina del operador, de la carga que soporta el órgano de aprehensión en cada momento.
•
Indicador de momento de carga: dispositivo automático de seguridad que detecta para cada posición de trabajo la carga máxima que se puede manipular.
•
Limitador de cargas: dispositivo automático de seguridad que detecta para cada posición de trabajo la carga máxima que se puede manipular, cortando el movimiento ascendente del mecanismo de elevación y aquellos movimientos que supongan aumentar los máximos momentos de carga prefijados en el correspondiente diagrama de cargas.
•
Final de carrera de elevación del órgano de aprehensión: dispositivo de seguridad que impide que el órgano de aprehensión se halle muy próximo a la cabeza de la pluma o plumín.
Fig. 1.3 Final de carrera
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
•
Dispositivo de puesta en veleta o giro libre: sistema que asegura la libre orientación de la estructura giratoria ante la acción del viento en la condición de fuera de servicio. Se puede utilizar, asimismo, para la auto alineación vertical de la pluma con la carga, antes antes de comenzar la maniobra de izado.
•
Parada de emergencia: produce la desconexión del motor y el mando eléctrico.
•
Anemómetro: dispositivo que mide la velocidad del viento y que al sobrepasar la velocidad predeterminada para cada tipo de grúa produce una señal intermitente acústica y visual de aviso, pero no la desconexión de los movimientos de la grúa.
•
Interruptor fin de carrera del cabrestante: desconecta el movimiento de bajar gancho cuando quedan tres vueltas en el tambor del cable.
•
“Hombre muerto”: hace que los mandos vuelvan a su posición neutra cuando se deja de actuar sobre estos.
•
Captador de ocupación del asiento del operador: Impide que se active por error cualquier dispositivo de la grúa.
1.3.
Clasificación de las Grúas Móviles Autopropulsadas Autopropulsadas
Las grúas móviles autopropulsadas se pueden clasificar principalmente, de acuerdo a la ITCMIE-AEM-4, según los siguientes criterios:
1.3.1.
1.3.2.
1.3.3.
1.3.4.
Según la base. 1.3.1.1.
Sobre ruedas.
1.3.1.2.
Sobre cadenas.
1.3.1.3.
Sobre bases especiales.
Según la estructura. 1.3.2.1.
Estructura giratoria.
1.3.2.2.
De pluma giratoria.
1.3.2.3.
De pluma fija.
1.3.2.4.
Grúa articulada.
Según la pluma. 1.3.3.1.
De longitud fija.
1.3.3.2.
De celosía.
1.3.3.3.
Telescópica.
1.3.3.4.
Sobre mástil.
Según los equipos especiales. 1.3.4.1.
De plumín fijo.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
1.4.
Requisitos del gruísta. Derechos y deberes.
Para el correcto montaje y manejo de las grúas móviles autopropulsadas, la persona que trabaja con ella deberá contar con
carné oficial de operador de grúa móvil autopropulsada1,
todo ello con independencia de que en el caso de que además sea el conductor del vehículo deba cumplir las disposiciones vigentes sobre la materia.
En todo caso, el manejo de la grúa móvil autopropulsada se realizará bajo la dirección y supervisión del director de la obra o actividad o la persona designada por él con carácter previo al inicio de las operaciones. Corresponderá al operador de la empresa alquiladora o titular de la grúa, las operaciones de montaje y de manejo de esta, y especialmente:
a) En el montaje: •
La conducción de la grúa móvil.
•
La instalación y comprobación del funcionamiento del indicador de capacidad / limitador de capacidad, así como de todos los dispositivos de seguridad de la grúa.
•
El emplazamiento de la grúa a partir de los datos sobre resistencia del terreno, pesos, balance de cargas y distancias, alturas y profundidades a operar durante las maniobras, debidamente aportadas por el arrendatario.
•
La colocación y comprobación de las placas de apoyo y de los gatos de apoyo.
b) En el manejo: •
La conducción de la grúa móvil.
•
Conocer las instrucciones del fabricante para las operaciones de elevación y
mantenimiento de la grúa. •
La aplicación de la información contenida en registros y tablas de cargas relativas al rango
de usos y de un uso seguro de la grúa. •
Comprobar el funcionamiento del limitador de cargas y del indicador de cargas.
•
El uso correcto y seguro de los gatos de apoyo y de la colocación de las placas de apoyo
de estos. •
El funcionamiento de la grúa, teniendo en cuenta los efectos del viento y otros efectos
climáticos sobre la carga y sobre la grúa.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Igualmente, y en el marco de operaciones y responsabilidad del operador de grúa móvil autopropulsada, y de los distintos agentes que actúan en el conjunto de operaciones de montaje y manejo de las grúas y preparación de los trabajos a efectuar, será responsabilidad de la empresa usuaria de la grúa móvil autopropulsada, especialmente:
•
La elección de la grúa de/con la capacidad adecuada a/para los servicios que se solicitan.
•
La designación del jefe de la maniobra, responsable de la supervisión y dirección de la
maniobra. •
La eliminación de obstáculos que impliquen riesgos, incluidas las líneas eléctricas de alta y
baja tensión con conductores desnudos, o en caso de ser imposible su eliminación, la toma de las medidas preventivas oportunas. •
La comprobación de que el terreno sobre el que va a trabajar y circular la grúa tenga la
resistencia suficiente. •
Ejecutar, con personas debidamente formadas, las técnicas y labores de estrobaje y
señalización. Además, basándonos en la norma UNE 58-508-78:
•
El gruísta tiene derecho a rehusar la ejecución de órdenes que considere que no
garanticen la seguridad. En caso de duda será su superior inmediato quien decidirá y asumirá la responsabilidad. •
El gruísta tiene el deber de separar de la grúa y de su radio de acción a toda persona no
autorizada. Igualmente tiene el derecho y el deber de señalar a su superior cualquier defecto, tanto desde el punto de vista técnico como en lo que concierne a la organización y a los factores humanos. •
El gruísta tiene el derecho de rehusar efectuar recorridos o trabajos con la grúa móvil si
esta no está dispuesta o no se encuentra en buen estado. •
El gruísta debe, en caso de peligro para personas o instalaciones, tomar o hacer tomar
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Con respecto a la primera pregunta, se debe comprobar que la grúa posee el correspondiente permiso de circulación (esto no aplica a todas las grúas, ya que algunas no circulan por vías públicas), ficha técnica con la ITV en vigor, seguro de circulación (no aplicable a todas las grúas) y de responsabilidad civil al corriente en el pago, libro de historial, inspección oficial oficial y revisiones y mantenimiento periódicos (según puntos 5 y 6 del R.D. 837/2003) y manual de instrucciones junto a las tablas de carga del aparato.
Fig. 2.1 Manual de instrucciones
Con respecto a la segunda pregunta, el gruísta deberá recibir la información necesaria en cuanto a modo de empleo de la grúa, distancia al lugar de trabajo y ruta a seguir, alturas y anchuras de paso, existencia de líneas aéreas de alta o baja tensión, peso y dimensiones de la carga, resistencia y tipo de suelo, altura de elevación de la carga y radio de trabajo,
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
3. ANTES DE INICIAR LA MARCHA. En general, se deberán realizar los siguientes controles antes de partir hacia el lugar de trabajo:
Control del nivel de agua, anticongelante y aceite del motor.
Control del nivel de aceite, presión y temperatura en la caja de cambio automática.
Control del nivel de aceite en la caja de cambio bajo carga.
Control del nivel de aceite, presión y temperatura en el depósito hidráulico.
Control visual de pérdidas en el motor, cambio, ejes y depósito de combustible.
Control de tornillos y piezas esenciales del vehículo.
Control de presión de aire y estado de neumáticos.
Control del nivel de combustible.
Control del estado del freno de mano y servicio.
Control de la fijación del contrapeso.
Con respecto al chasis de la grúa, además se controlará lo siguiente:
Los ejes están suspendidos.
Interruptor en posición de “chasis”.
El conjunto giratorio estará puesto en el sentido de la marcha y bloqueado, evitando así giros peligrosos.
La pluma telescópica debe estar completamente retraída y depositada en su soporte.
Las ventanas y puertas estarán cerradas, los peldaños retraídos,
escaleras
aseguradas y cajas de mando cerradas.
Los largueros corredizos y rueda de repuesto estarán embulonados y asegurados.
Las placas de apoyo estarán en posición de transporte, embulonadas y aseguradas.
Evitar la existencia de cuerpos extraños sobre el bastidor y bajo el contrapeso.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Con respecto al conjunto giratorio, además se controlará lo siguiente:
La corona giratoria se encuentra limpia y engrasada.
Funcionamiento correcto del limpia y lavaparabrisas.
No existencia de piezas sueltas sueltas sobre el conjunto giratorio y la pluma telescópica.
Controlar la posición de los cables sobre el tambor y las poleas.
Asegurarse de que las partes del plumín están correctamente embulonadas y aseguradas.
Comprobar que los dispositivos de seguridad de la grúa (limitador del momento de carga, válvulas de seguridad, indicadores de ángulo de pluma y de carga en gancho, pestillo de seguridad, limitador de final de carrera,…) funcionan correctamente.
Además de todo lo anterior, se debe controlar la no existencia de derrames de líquidos, aceites o combustibles sobre la grúa, ya que podría provocar resbalones y caídas a distinto nivel.
Fig. 3.1 Comprobaciones antes de iniciar la marcha
Para subir y bajar del vehículo se usarán los lugares destinados a tal fin (escaleras y asideros), evitando agarrarse a cables, mangueras o palancas de mando, y se hará de cara al vehículo.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Fig. 3.2 Forma correcta de subir y bajar a la grúa
NUNCA SUBIR POR LOS ESTABILIZADORES, SALTAR DEL VEHÍCULO AL SUELO O MONTARSE EN ESTE CUANDO SE ENCUENTRA EN MARCHA.
Fig. 3.3 No saltar
Fig. 3.4 No subir en marcha
Finalmente, comprobaremos que disponemos de los EPI´s necesarios para realizar el trabajo con toda seguridad. Estos serán:
•
Casco de seguridad.
•
Calzado de seguridad.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Fig. 3.5 Equipos de Protección Individual
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
4. CONDUCIR LA GRÚA HASTA EL LUGAR DE TRABAJO O DESDE ESTE A LA BASE. La grúa móvil, durante su desplazamiento, está expuesta a unos riegos variables por lo que es recomendable respetar una serie de normas de seguridad:
•
En caso de un trayecto sobre vía pública, el conductor debe estar en posesión del permiso y certificados necesarios para él y el vehículo.
•
Observar particularmente las señales indicadoras de señalización concernientes a la carga máxima sobre los puentes y las indicaciones relativas a alturas de paso.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
5. LLEGADA AL LUGAR DE TRABAJO. •
Se seguirán estrictamente las normas de seguridad de la obra, recinto, factoría,... donde se vayan a prestar los servicios, así como las limitaciones de velocidad.
•
En especial, se prestará atención a todas las señales e indicaciones de aviso, peligro, prohibición y obligación.
Fig. 5.1 Señales de obligación
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
6. MONTAJE DE LA GRÚA MÓVIL. Antes de montar la grúa, se debe de elegir adecuadamente el lugar de emplazamiento, de manera que:
•
Se puedan extender los estabilizadores a la base de apoyo prescrita en las tablas de carga.
Fig. 6.1 Formas de extender los estabilizadores
•
Se pueda emplear la grúa con el alcance más bajo posible.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
•
El suelo en el lugar de empleo sea lo suficientemente resistente para aguantar la presión y que esté a nivel.
Fig. 6.3 Resistencia del terreno
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
La distancia de seguridad (B) a taludes y fosos se mide a partir de la profundidad (h) de los mismos. a)Terreno a)Terreno blando o terraplenado: dos veces la profundidad del foso o talud
(B2= 2xh).
b)Terreno b)Terreno duro o natural: la distancia debe ser como mínimo igual a la altura del foso o talud (B1=1xh).
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Fig. 6.9 y 6.10 Peligros por contacto eléctrico
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
•
Extender totalmente los largueros corredizos y, en caso de no ser posible, se extenderán teniendo en cuenta las indicaciones del fabricante respecto a la pérdida de capacidad de carga.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Fig. 6.15 y 6.16 No olvidar las horquillas de fijación
•
Si el terreno es blando o inestable se usarán placas de reparto (calzos) para ampliar la superficie de apoyo y disminuir así la presión transmitida al suelo. Este ha de ser rígido, firme y de una superficie de al menos 3 veces la superficie del plato (traviesas de ferrocarril, placas de teflón o acero).
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
•
Nunca calzar bajo los largueros corredizos, ya que esto acercaría el eje de vuelco al centro de gravedad de la grúa con el consiguiente peligro de vuelco de la grúa.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
Si se hace necesario el montaje del plumín (punta rebatible), se seguirán estrictamente las indicaciones y normas de seguridad recogidas en el manual del fabricante. En especial: •
Usar arnés de seguridad (para alturas superiores a dos metros) que se enganchará en la estructura de la grúa, además del medio auxiliar adecuado (escalera manual, andamio, plataforma elevadora,...).
•
Retraer completamente la pluma telescópica y colocarla en posición 0º.
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
7. TRABAJAR CON LA GRÚA MÓVIL. Antes de comenzar a trabajar, y si es necesario, se designará un encargado de señales con la capacitación y formación adecuada. Este estará perfectamente identificado mediante brazalete o peto reflectante. Sólo se obedecerán las señales de este. Se usarán los medios auxiliares de comunicación necesarios (Ver anexo II).
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MANUAL DE SEGURIDAD PARA OPERADOR DE GRÚAS MÓVILES AUTOPROPULSADAS Autor: Manuel J. Muñoz Solano
La maniobra de izado requiere de una serie de normas de seguridad. Pasemos a enumerarlas:
•
Es esencial evitar el paso de cargas sobre personas o vehículos, acotando la zona de radio de acción de la grúa o, en caso de ser esto inevitable, emitiendo señales de aviso previamente establecidas y conocidas por el personal.
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