Abstract: An auxiliary tunneling apparatus includes a reaction force receiver and first and second split components. In the excavation of a second tunnel by a boring machine, the reaction force receiver forms a replacement face of a side wall of the second tunnel on a first tunnel side where the first and second tunnels intersect each other, and a gripper of the boring machine pushes against the replacement face. The first and second split components are installed to push against the side wall of the first tunnel, support the reaction force receiver within the first tunnel, and move back and forth with respect to the side wall of the first tunnel.

Abstract: Mine roof support comprising a base including a pair of skids, a roof engaging canopy, jacks acting between the base and the canopy, an auxiliary jack connected to the base for lifting or lowering at least part of the base when the support advances and a lost motion arrangement connected between the base and the auxiliary jack for aiding movement of the base and the roof engaging canopy toward each other. The lost motion arrangement is connected to each of the skids by a pivotal connection which permits the front end of one skid to move vertically to a limited extent with respect to the front end of the adjacent skid.

Abstract: A method and device is provided for the moving of a shield-type support trestle 1 having stamps 4, 5 arranged between a roof pressure cap 3 and a lying skid 2, a pushing ram 6 is in the lying skid 2, and control valves 11, 12, 13, 14 for controlling the desired functions of the shield-type support trestle 1. The stamps 4, 5 have an inlet valve 22 and a discharge valve 4. A pressure line 40 is provided between control valve 13 and the pushing ram 6. A valve 51 is provided which is controlled by the pressure in the pressure line 40 and by which interconnects stamp pressure chambers. A manometric switch 48 is arranged on the pressure line 40 and activates an electronic control device 42. In lines 53, 55, and 29 between the stamp pressure chambers and the return line 18, an unlockable reflux valve 54 is provided which is actuated through the electronic control device 42 and the discharge valve 24.

Abstract: A composite fiber and resin sign post for displaying highway signs which provides great reduction in vehicle damage in the event a vehicle moving at high speed collides with the sign post. This potential is achieved by the controlling the mode and location of the structural failure of the post upon impact. The failure mode of the post is controlled by varying the configuration of the post in cross-section, in combination with varying the specific fibers and resins, and in further combination with varying the location and placement of the fibers. The composite post may be constructed by pultrusion, filament winding, or related processes. A preferred embodiment uses a ground anchor socket constructed either by processes and components similar to those used in manufacturing the post, or by stamping sheet steel and spot welding to form a socket. The anchor socket provides additional control over the post failure and makes replacement of damaged posts quicker and easier.

Abstract: The invention refers to a trestle (1) being displaceable on caterpillars (2) and having an approximately rectangular cross section and serving the purpose of supporting the roof in underground cavities, in particular serving the purpose of securing the excavating edge when recovering pillars (19) in coal mining, the trestle comprising a cap (4) being supported against a base frame (3) by hydraulically expandable props (5) extending approximately vertically relative to stratification. The trestle (1) has, related to the travelling direction of its floor chassis (2), at its both sides supporting plates being adjustable in outward direction and/or horizontal driveable caterpillar chassis being adjustable in outward direction. The supporting plates (22, 23) and/or the lateral caterpillar chassis (20, 21) are adjusted against the frame of the trestle by means of hydraulic or pneumatic pistons and cylinders and are adjustable in outward direction.

Abstract: A mobile mine-roof support comprises a powered track-laying carriage having a carrier shaft extending longitudinally of the carriage between its tracks, the end portions of the carrier shaft being arranged to support mountings of bracket form for props supporting a roof beam which is stabilized by a lemniscate guide linkage the floorward links of which ar articulated to an attachment part or extension of one of the prop mountings, with stabilization of the laterally-pivotable props being effected by an orienting cylinder supported on the chassis.

Abstract: A method of mining a mineral in which a roof is supported by a plurality of mine roof supports of the kind specified, each advanceable by a force applied to a lower part thereof. During advance of the support an upper part thereof can be sufficiently retarded, by hydraulic jacks carried, by each of its adjacent supports, with respect to the advance of its lower part. This causes the support effectively to rotate and to raise the leading end of the lower part away from the ground on which it is advancing.

Abstract: A gantry support for supporting a roof of a passage includes two parallel supporting units each having a lower frame provided with articulated tracks and an upper frame carried by props and two cross-members. The two cross-members carry an intermediate upper frame in the form of a beam which is slidable on guide elements and adapted to be clamped to the roof by small jacks. As the support advances the beam remains clamped against the roof of the passage until the beam reaches an end stop. The small jack is then released and the beam slidably advanced along the guide elements by means of a further jack.

Abstract: A gantry support for supporting a roof of a passage is advanceable along a floor of the passage. The support has two parallel supporting elements mutually spaced apart laterally of the support, each element including at least two pairs of frames provided with articulated tracks. One frame of each pair is an upper frame and the other is a lower frame, the tracks of which are adapted to be applied respectively against the roof and floor of the passage by loading jacks applying a spreading force between the upper and lower frames. An intermediate upper frame is carried by an upper cross-member extending from one supporting element to the other and at least one loading jack applying a spreading force connects each lower frame to the corresponding end of the upper cross-member.

Abstract: A mineral mining installation has a longwall scraper-chain conveyor with a machine, such as a plough, guided for movement back and forth alongside the conveyor to win mineral from a longwall face. A roof support system which may be arranged at the ends of the longwall working, i.e., at the so-called stable zones, is composed of several units each with hydraulic props protected within cylindrical telescopic casings. Each support unit may be displaceable as a whole to follow the working progress or else each support unit may be constructed with front and rear frame assemblies which are relatively displaceable. Each support unit has at least five narrow elongate roof bars disposed closely side-by-side in parallelism. The roof bars are guided for longitudinal advancement and hydraulic rams serve to advance the roof bars individually or in groups. A similar arrangement may also be employed as the floor structure of each support unit.

Abstract: A roof support for use in mines is moved by its own drive mechanism while under permanent load. The support comprises two side-by-side lower carriages with articulated tracks, cross members joining those carriages and an arm articulated to the cross members so as to swing up and down under the action of a jack connected between the arm and the cross members. At least one upper carriage having an articulated track is carried on the upper end of the arm, and is pushed against the roof of a mine gallery by the jack.

Abstract: A roof support capable of being moved by a drive mechanism while under permanent load includes two pairs of carriages, each carriage carrying an articulated track. The carriages of each pair are arranged one above the other and the two pairs of carriages are disposed parallel. The upper carriages can then be applied against the roof and the lower carriages against the floor of an underground gallery. The upper carriages are connected by at least one cross-member and the lower carriages are connected by two cross-members, and means are arranged to apply a force to the cross-members to separate the upper carriages from the lower carriages. The cross-members and carriages are connected together by pivotal joints.