A crawler bridge (10) having a bridge section (12) for bridging across opposite sides of a gap G. The bridge section (12) being connected to a support structure (14) which has a pair of elongate beams (16,17), that are spaced apart and generally parallel. The beams (16,17) each including leading and trailing feet (18,19). The bridge section (12) is attached to the beams (16,17) for relative movement forward and backward along the beams (16,17) and vertically up and down. The crawler bridge (10) has a first mode of operation when the leading and trailing feet 18,19 of the beams (16,17) are in engagement with a ground surface, in which the bridge section (12) is supported by the support structure (14) elevated above the ground surface and is movable forward and backward along the beams (16,17) and vertically up and down. The crawler bridge (10) has a second mode of operation when the bridge section (12) has been moved downward relative to the beams (16,17) and into engagement with a supporting surface, in which the leading and trailing feet (18,19) of the beams (16,17) are lifted away from the supporting surface and the beams (16,17) are movable forward and backward relative to the bridge section (12) and vertically up and down relative to the bridge section (12).

A lowering system for lowering ceiling formworks during the removal of formworks of a building ceiling, comprising a reciprocating piston and a support base, and a locking device, wherein the reciprocating piston is slidably mounted in the support base, and can be pushed from an extended working position to a lowered position, and can be locked in the extended position by means of the locking device. The locking device has a pivot bearing and an eccentric lever, wherein the eccentric lever is rotatably mounted in the pivot bearing, and the reciprocating piston and the support base are supported against each other in the working position by means of the eccentric lever.

A vertically-adjustable gantry assembly installation adapted for removal or placement of a train bridge-span of the type which spans and is supported by two piers, comprises a gantry assembly positioned on load-bearing first ground-support locations, the gantry assembly comprising a gantry and a ground-engaging vertical support and lift system, the vertical support and lift system adapted for supporting a combined weight of the gantry and a bridge span in at least one operational vertical position above respective bridge span support-surfaces of the piers including a position corresponding to a disembarking plane in which the leg portions are extended from a stowed position to an extent at least sufficient for the gantry assembly to self-liftoff the pre-installation conveyance system onto the first ground-support locations to effect the gantry assembly installation.

A vertically-adjustable gantry assembly installation adapted for removal or placement of a train bridge-span of the type which spans and is supported by two piers, comprises a gantry assembly positioned on load-bearing first ground-support locations, the gantry assembly comprising a gantry and a ground-engaging vertical support and lift system, the vertical support and lift system adapted for supporting a combined weight of the gantry and a bridge span in at least one operational vertical position above respective bridge span support-surfaces of the piers including a position corresponding to a disembarking plane in which the leg portions are extended from a stowed position to an extent at least sufficient for the gantry assembly to self-liftoff the pre-installation conveyance system onto the first ground-support locations to effect the gantry assembly installation.

A bridging system comprising a bridge (10) and a trolley (70), the bridge comprising a bridge deck (40) having at least two pre-formed bridge sections (42), the trolley including a set of wheels (573) with a track width configured such that in use with the trolley located on the bridge deck, at least one wheel contacts one stringer (443A) and at least one other wheel contacts another stringer (443B), the system further including tracking means for maintaining the at least one wheel in contact with the one stringer and for maintaining the at least one other wheel in contact with the other stringer such that the trolley and bridge deck may remain in contact while moving relative to, or with, one another for the launching of the bridge deck over a space to be bridged, the trolley being configured to carry goods and/or personnel over, and along, the bridge deck after the bridge has been positioned over the space to be bridged.

A bridging system comprising a bridge (10) and a trolley (70), the bridge comprising a bridge deck (40) having at least two pre-formed bridge sections (42), the trolley including a set of wheels (573) with a track width configured such that in use with the trolley located on the bridge deck, at least one wheel contacts one stringer (443A) and at least one other wheel contacts another stringer (443B), the system further including tracking means for maintaining the at least one wheel in contact with the one stringer and for maintaining the at least one other wheel in contact with the other stringer such that the trolley and bridge deck may remain in contact while moving relative to, or with, one another for the launching of the bridge deck over a space to be bridged, the trolley being configured to carry goods and/or personnel over, and along, the bridge deck after the bridge has been positioned over the space to be bridged.

A method of slip forming a concrete structure can include using a first slip form mold that travels along a path to form a portion of a concrete structure by delivering a first flow of concrete into the first mold through a first hopper. The first hopper can be configured to receive the first flow of concrete. The portion of the concrete structure can be modified using a second slip form mold different from the first mold by advancing the second mold along the concrete structure and, while advancing the second mold, delivering a second flow of concrete into the second mold through a second hopper that is configured to receive the second flow of concrete.

A supporting device for the construction industry. Said device has a fixing element which rests against a side wall and is fixed at a fixing point of the side wall. Said device also has a cantilever which is connected to the fixing element and, when the fixing element is in the fixed state, projects from the side wall such that a load element can rest against a bearing point of a bearing element of the cantilever. The load element can now be displaced in a displacement direction substantially parallel to the side wall relative to the cantilever and, when the load element rests against the bearing element of the cantilever, the cantilever is coupled to the load element such that a displacement force component acts on the cantilever in the displacement direction when the load element is displaced, said displacement force component resulting in a torque on the cantilever.

A gantry assembly includes a main beam extending between a first and a second end. A plurality of legs including a pair of first legs and a pair of second legs attached to the main beam. A pair of first trolleys is slidably attached to the main beam. A first girder is attached to each one of the first trolleys and extends outwardly from the first trolleys for movement with the first trolleys. The first girder includes a pair of posts having a first and a second post disposed spaced from one another. The first post is attached to the first girder and extends downwardly from the first girder. The second post is slidably attached to the first girder and is movable along the first girder toward and away from the main beam allowing the gantry assembly to have different widths to accommodate for a single or double railway bridge.

A gantry assembly includes a main beam extending between a first and a second end. A plurality of legs including a pair of first legs and a pair of second legs attached to the main beam. A pair of first trolleys is slidably attached to the main beam. A first girder is attached to each one of the first trolleys and extends outwardly from the first trolleys for movement with the first trolleys. The first girder includes a pair of posts having a first and a second post disposed spaced from one another. The first post is attached to the first girder and extends downwardly from the first girder. The second post is slidably attached to the first girder and is movable along the first girder toward and away from the main beam allowing the gantry assembly to have different widths to accommodate for a single or double railway bridge.