Lifting rope operated hydraulic actuator for grab - has rope driven hydraulic pump for operating grab jaw actuating cylinder
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HYDRAULICALLY OPERATED GRIPPER HANGED ON A CABLE
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Removing excavated material from tunnels - compressed air pipe transports bags filled with material to surface
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4 - allowing sinking of piles without time-consuming manoeuvring in restricted space
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Bearing construction for the lateral insertion of a bridge superstructure
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Tunnelling shield advancing system - uses concrete injected behind linings as pressure surface for advancing cylinders
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Mine tubbing section with concrete retention - cavities on outer face prevent wet concrete from hardening during stacking
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Metal tunnel lining segment - pads incorporated inside flanges form flat seatings for telescopic clinders or wedge blocks
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Joint seals in tunnel lining construction - prevents strains and stresses being conveyed via joints
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Equipment for widening earth bore holes - has two pivoting shovels activated by linkage of free falling weight
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Tension anchors for cohesive soils - has several vanes arranged at bottom end of bore tube producing expanded cavity
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Enlarged borehole foot caliper - has rope-actuated toggle levers pivoted in carrier
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Concrete hopper for concreting pile boreholes - has closing cone held by lifting rope which is opened when rope slackens
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Torque transmitter from rotary earth drill to carrying digger - has hinged four sided guide block on bridge
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Axially slotted drill pipe shoe - with bottom end divided arcuate parts which can swing out to increase cutting dia.
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Lifting path measurer for cable operated lifting tools - has spring loaded perforated disc which acts with light barrier to generate counting pulses in metres
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Mine consolidation strata bolting - injected body substance set split and expanded onto hole wall
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Protective external covering for pipes - has steel outer cover connected to inner plastic conveying pipe only at ends
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CAST-IRON TUEBBING
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Hydraulically operated scoop for borehole excavation - has scoop which is locked during scooping hydraulically against the tubular liner of the borehole
