§ Е39-5. Разработка подводного грунта канатно-скреперной установкой Указания по применению норм

Нормами предусмотрено устройство подводной траншеи канатно-скреперной установкой (рис. 2) в песчано-илистых, гравелистых и глинистых грунтах при длине разрабатываемых траншей до 150 м.

Разработка грунта осуществляется перемещением его в отвал скреперным ковшом от хвостового блока к головной опоре с последующим перемещением грунта в сторону с помощью бульдозера.

Транспортирование грунта бульдозером нормами не учитывается.

Работы по устранению обрывов тросов и опрокидывания ковша выполняются дежурной водолазной станцией.

Ширина траншеи по дну зависит от габаритов скреперного ковша и приводится в табл. 1.

Таблица 1

┌──────────────────────────────────────────────────┬─────────────────┐

│Вместимость ковша канатно-скреперной установки, м3│Ширина траншеи, м│

├──────────────────────────────────────────────────┼─────────────────┤

│ 0,5 │ 1 │

│ │ │

│ 0,75 │ 1,5 │

│ │ │

│ 1 │ 1,5 │

│ │ │

│ 1,5 │ 1,75 │

└──────────────────────────────────────────────────┴─────────────────┘

Скреперование ковшами вместимостью 0,5 и 0,75 м3 производится с помощью двухбарабанной фрикционной лебедки мощностью до 73,5 кВт (100 л.с.), грузоподъемностью 3-5 т, с ковшами вместимостью 1 и 1,5 м3 с помощью тракторных лебедок типа ТЛ-11.

Нормами предусмотрены расстояния скреперования: до 50 м, св.50 до 100 м и св.100 до 150 м, в связи с чем нормы должны применяться по отдельным участкам.

Пример. Определить нормативные затраты времени в маш.-ч на разработку подводной траншеи в песчаном грунте скрепером с ковшом вместимостью 0,5 м3 при длине траншеи 140 м и объеме грунта 1020 м3, в том числе на первом участке на расстоянии до 50 м - 420 м3, на втором - св.50 до 100 м - 310 м3 и на третьем - св.100 до 140 м - 290 м3.

Принимаем нормы по строке N 1 граф "а", "г", "ж" табл. 3 настоящего параграфа. В этом случае затраты времени будут составлять: 14 x 4,20 + 21,5 x 3,10 + 31,5 x 2,90 = 216,8 маш.-ч.

Монтаж скреперной установки, устройство П-образной опоры, закладка мертвяков и якорей, прокладка тросов, установка электродвигателя и лебедки нормами не учтены.

Состав работы

1. Подготовка и пуск установки. 2. Скреперование грунта. 3. Вытаскивание ковша на берег. 4. Разгрузка грунта в отвал. 5. Очистка ковша от налипающего грунта. 6. Смена ковша и тросов (при необходимости). 7. Перестроповка блоков.

Состав звена

Тракторист 5 разр. - 1

Речной рабочий 4 разр. - 1

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: Рис. 2. Схема работы канатно-скреперной установки

Таблица 2