Abstract: A method and device for shoring trenches includes insertion of a first couple of lining plates into a ditch. A stiff bracing frame may be guided within a first couple of linear guides between the two lining plates, one linear guide being connected to one lining plate. A second couple of lining plates may be guided between the first lining plates and inserted into the ditch. A second couple of linear guides may be inserted between the first linear guides, one of the second linear guides being connected to one of the second lining plates, and the second linear guides being kept at a distance using a brace. The bracing frame between the first linear guides may be removed, and the second lining plates and the second linear guides may be lowered while the stiff bracing frame is inserted between the first linear guides when the ditch is dug deeper.

Abstract: An assembly suitable for temporarily covering a trench comprises an anti-slip tile (30) and a separately formed trench cover. The anti-slip tile (30) may be releasably attached to the trench cover. The anti-slip tile (30) comprises a plurality of cylindrical protrusions (21) integrally formed with a body portion of the tile (30), protruding from an upper surface (6) of the body portion (5), and evenly spaced across the upper surface (6) to minimise the possibility of a wheel of a vehicle slipping as the wheel passes over the anti-slip tile (30) and over the trench cover. The body portion (5) has a plurality of openings (22) extending through the body portion (5), the openings (22) being spaced across the upper surface (6) to reduce the overall weight of the anti-slip tile (30), and to provide a means of draining rainwater from the upper surface of the body portion (5). Two openings (31a) are located at opposite end edges of the body portion (5).

Abstract: A hydraulic lifting device including a main beam, two or more connection plates fixedly connected to the main beam, at least two legs, each leg pivotably attached to two of the plates, at least two hydraulic cylinders, each cylinder disposed between the beam and one of the legs, and two or more load connectors.

Abstract: There is disclosed an apparatus and method for moving with an excavator arm a trench box having a pair of adjacent spreader bars at a forward end. The apparatus has a bracket end for connecting to the excavator arm and a hooking fork. The hooking fork has a first surface that engages the first spreader bar of the trench box. The apparatus also includes a second surface for engaging the adjacent second spreader bar when used to lift the trench box from the trench or move the trench box along the trench floor.

Abstract: A stackable component for concrete forming systems is described. End plates are secured to opposite ends of a longitudinal element having a round profile that prevents stacking of the components. The end plates nest together and receive for retention the longitudinal element to permit orderly and stable stacking of the components.

Abstract: A panel pushing assembly (10) for a slide rail system having a first and second wall (12, 14) includes an elongated member (16) having a bottom end (18) and a top end (20), and a guide (40) disposed about the elongated member (16). The guide (40) guides slidable movement along the elongated member (16) and includes a collar (42) engaging the walls (12, 14) of the elongated member (16) and a catch (44) extending laterally from the collar (42) to engage the second wall (14), which is the stationary wall. The collar (42) includes a plurality of side-plates (46) and the catch (44) includes a hook portion (70) extending downwardly along the outside of the second wall (14) for preventing lateral movement of said elongated member (16) relative to the second wall (14).

Abstract: This shoring system enters in the category of slide rail shoring systems, including rails, panels and strutting assemblies. It applies on shoring of excavations of various shapes such as trenches, rectangular and polygonal pits of great or lesser depth. Rails are of two types, linear or corner rails. Pairs of linear rails are spaced apart along excavation so that a strutting assembly keeps opposite rails of a pair of rails pressing against wall of excavation; corner rails are placed on the corners of any polygonal shaped excavation. Shoring panels slide vertically between adjacent rails creating a shoring wall on two or more sides of excavation. Rails have opposite sides provided with an outer and an inner guide for sliding vertically panels. The outer guide runs the full length of rail while inner guide is halfway from the bottom up reducing the weight of rail and easing installation and removal of panels.

Abstract: A lightweight trench shield having side panels spaced apart by spreaders. Each panel has a core formed of a metal honeycomb with the core faces having a fiber in resin matrix layer thereon. The core density varies with regions proximate the spreader supports being increased to provide support for side loads. The spreader supports receive the ends of the spreaders and distribute the applied loads outwardly from the spreader via a mounting ring.

Abstract: Improved shoring systems and methods are disclosed. In one embodiment, a shoring system includes first and second opposing side walls. A manifold is pivotally connected to the first side wall and is pivotally moveable between a shielded position and an exposed position. In the shielded position, the manifold is at least partially covered by a shield. In the exposed position, the manifold is pivoted upward to expose components of the manifold, such as hydraulic inlets and outlets, valves, and hydraulic fluid lines. The shoring system is safer, easier, and more efficient to operate than conventional shoring systems.

Abstract: Disclosed herein is a support system that is temporarily placed below ground for preventing collapse of the excavated ground when a subway is constructed or a basement of a building is built. The excavated ground or load is supported by means of supporting members, the supporting members being pre-stressed by means of tensioning members and tendon support members serving to support the tensioning members. Consequently, the number of struts for supporting vertical piles and wales is considerably reduced so that obstacles in the under-ground space when it is excavated are removed. Furthermore, the constructional efficiency of the underground space is greatly improved, and the cost of construction is sharply reduced.

Abstract: A catwalk is provided for use in trenching operations that provides increased safety and improves efficiency. Methods are also provided that save time over the prior process of building multiple land bridges. Selected features include reduction in the number of ladders used increases worker safety, along with several other safety features such as catwalk railings, holding devices for ladders, etc. One catwalk is shown with a skid assembly to further increases efficiency by allowing the trench box to be towed with the catwalk in place.

Abstract: A connection arrangement for temporary shoring in an excavation site is used to secure I-beams together at corners within the excavation site. Typically, four I-beams are connected together to form a rectangular frame that is suspended within the excavation for bracing the shoring walls thereof. However, any polygonal shape may be used. The connection arrangement includes mating socket or connecting members which are placed over the ends of I-beams to be fastened together. One of the connecting members includes an outwardly extended tab while the other includes a pair of outwardly extended tabs. The first outwardly extending tab fits between the two extending tabs of the corresponding connecting member. All of the tabs are provided with apertures which are placed in alignment when the connection is made so that a bolt or pin can be passed through the apertures to secure adjacent connecting members together.

Abstract: An inventive apparatus and method provides for restricting movement from a collapsed or folded position of a pair of rails employed by a shoring assembly. The shoring assembly has a plurality of first pads each pivotally connected to one of the rails, a plurality of second pads each pivotally connected to the other of the rails, and a plurality of hydraulic jacks each being operatively connected between an opposing pair of the first and second pads. The pivoting movement of the plurality of first pads is restricted relative to the one rail when the rails are disposed in the collapsed position. In a particular embodiment, a pair of first pads and a pair of second pads—respectively known as cylinder pads and socket pads—are employed by the shoring assembly. Accordingly, a pair of hydraulic jacks are further employed in this embodiment of the shoring assembly.

Abstract: This invention discloses a device for shoring open excavations including a pair of shoring panels held vertically apart and parallel to each other against sidewalls of excavation by a pair of strutting assemblies. Each shoring panel having laterally on either end a vertical guide of circular cross section and lengthwise two identical cutting edges of triangular cross section, which are inversely arranged one on the top and the other at the bottom of panel and reverse relative to sidewall of excavation as well. Each strutting assembly has a pair of vertical struts held against each other by at least one horizontal strut that is fastened by pin or bolts onto vertical supports. Each vertical strut is provided with a circular guide channel encompassing the guide of shoring panel and interlocking with it, so that shoring panels slide independently from each other, while the strutting assembly can adjust different pipe culverts.

Abstract: A shoring system for trenches comprising large shoring panels and strutting assemblies is disclosed. Shoring panels are arranged in pairs against either wall of the trench and held vertically by adjacent strutting assemblies spaced apart along the trench. Each strutting assembly has at least one horizontal strut fastened in between a pair of opposite vertical struts. Each said vertical strut has laterally opposite guide channels to receive cooperatively the guide edge of the shoring panel that slides vertically within. Each guide channel of said vertical strut is provided with a locking bar to interlock the guide edge of the shoring panel so that pairs of shoring panels are linked successively on either side of a strutting assembly to create a shoring wall on either side of the entire trench. Said vertical strut is further provided with pairs of rollers to ease sliding of shoring panels.

Abstract: This apparatus relates to shoring of deep excavations such as pits or trenches. It includes vertical rail posts arranged symmetrically in pairs that are spaced from each other along the excavation, articulated trusses and/or spreaders holding opposite rail posts against each other and large shoring panels sliding between adjacent rail posts on either side of the excavation. Each rail post has on either side one channel of a stepped or non-stepped cross section guiding vertically two or more shoring panels. In one variation, the inner and outer panel guides on one side of the vertical rail post reside in the same vertical plane. The connections between the rail post and the wall panels are partially or completely open. The open connections may be performed by magnetic forces arising from thin magnetic flat bars incorporated in the posts or the panels in the area of their contact.

Abstract: An excavation shoring system having four vertical, cylindrical poles, each connected to a base element, arranged to constitute corners of a rectangle. At least one vertically oriented shoring panel corresponding to each side of the rectangle is provided, with each of the shoring panels corresponding to adjacent sides of the rectangle having one end rotatably connected to a first pair of diagonally opposed cylindrical poles in a manner forming four vertical walls of uniform height. At least two vertically oriented, U-shaped channels disposed at right angles to each other are connected to a second pair of diagonally opposed cylindrical poles. The U-shaped channels have a channel width substantially corresponding to a thickness of the panels and are oriented to receive a free end of each shoring panel.

Abstract: A corner connection used to secure I-beams together at corners within the excavation site is provided with a reinforcing assembly that allows for greater loads. Typically, four I-beams are connected together to form a rectangular frame that is suspended within the excavation for bracing the shoring walls thereof; however, any polygonal shape may be used. The corner connection itself comprises mating socket or connecting members that are placed over the ends of I-beams to be fastened together. One of the connecting members includes an outwardly extended tab while the other includes a pair of outwardly extended tabs. The first outwardly extending tab fits between the two extending tabs of the corresponding connecting member. All of the tabs are provided with apertures that are placed in alignment when the connection is made so that a bolt or pin can be passed through the apertures to secure the two connectors together.

Abstract: A conformable modular support/enclosure wall system incorporates a skin formed of modular sheet sections bolted to a skeleton or framework constructed of elongate rib elements that can be fastened, e.g. bolted, together in various relationships including end-to-end, side-to-end and side-to-side configurations. The rib elements are provided in a variety of lengths and wall arrangements and each element has a generally trapezoidal cross-section, with a similar trapezoidal appearance in side elevation. The rib elements include transverse slots and apertures as well as axial apertures all configured to receive bolt fasteners within a range of angular orientations relative to the axial and transverse axes of the ribs. The flexible sheet sections of the skin bear arrays of openings in the form of elongated slots arranged in coordinate grid patterns, with the slots alternately aligned with the x and y axes of the same or independent coordinate grids.

Abstract: A shoring device is disclosed comprising a piston and a cylinder. The piston is axially expanded by compressed gas, whereby the shoring device engages two opposing surfaces. An outer cam collar and a concentrically enclosed inner ring are mounted upon the cylinder end into which the piston inserts. This outer cam collar comprises at least two cam edges, two stop faces and a threaded cam pin within an integral boss. The inner ring comprises a continuous circular indentation as well as a continuous circular inner lip. The outer cam collar and inner ring, together with the continuous circular inner lip and threaded pin, firmly retain the piston. These piston retention features prevent inadvertent rotation and collapse of the piston during use.

Abstract: A device for shoring trenches having rails, panels and articulated trusses such that pairs of opposite rails are upheld vertically by trusses and spaced along the trench to support shoring panels which slide past each other vertically within guides of adjacent rails; the rail having a back flange welded on a main rectangular tube which is provided on either side with two lateral rectangular tubes welded offset and inward past the main tube such that with a front flange welded on each lateral tube shape two vertical guides on either side of rail, the front flanges being projecting into the space between lateral tubes creating a guide contouring the edge of articulated truss which slides interlocked within; the panel being provided with special edges that interlock within vertical guides of rail, the truss being articulated and provided with roller to displace along the front flanges of the rails.

Abstract: A self-propelled all terrain track driven trench box carrier, comprising a main frame, a pair of side frame members, a pair of transversely adjustable end wall frame members and detachable attachable extension structure members. A cat-walk, hand rails, access ladders and safety rails. A pair of adjustable hydraulic wheel track assemblies mounted along the two sides, supporting the apparatus, and allowing the trench box carrier to be propelled along the ground. A pair of detachable attachable extension structure members, for adjusting the width of the trench box carrier, to accommodate different widths of a trench. Adjustable wheel track connectors are detachably attached with an extension axle, to increase the overall wheel base of a trench box carrier for work on oversize trenches. A plurality of hydraulic cable wenches for controlling a trench shield. A main engine power supply for operating a self-propelled all terrain trench box carrier.

Abstract: This apparatus relates to shoring of deep excavations such as pits or trenches. It includes vertical rail posts arranged symmetrically in pairs which are spaced form each other along the excavation, articulated trusses holding opposite rail posts against each other and large shoring panels sliding between adjacent rail posts on either side of the excavation. Each rail post has on either side one channel of stepped cross section guiding vertically two or more shoring panels. The connections between the post and the panel are partially or completely open. The open connections are performed by magnetic forces engendered by thin magnetic flat bars incorporated in the posts or the panels in the area of their contact. The articulated truss is of scissoring type composed of triangular cells only and their members have pinned connections.

Abstract: This shoring system enters in the category of slide rail shoring systems, including rails, panels and strutting assemblies. It applies on shoring of excavations of various shapes such as trenches, rectangular and polygonal pits of great or lesser depth. Rails are of two types, linear or corner rails. Pairs of linear rails are spaced apart along excavation so that a strutting assembly keeps opposite rails of a pair of rails pressing against wall of excavation; corner rails are placed on the corners of any polygonal shaped excavation. Shoring panels slide vertically between adjacent rails creating a shoring wall on two or more sides of excavation. Rails have opposite sides provided with an outer and an inner guide for sliding vertically panels. The outer guide runs the full length of rail while inner guide is halfway from the bottom up reducing the weight of rail and easing installation and removal of panels.

Abstract: A shoring device comprises a piston and a cylinder. The piston is axially expanded by compressed gas, whereby the shoring device engages two opposing surfaces. An outer ratcheting collar and a concentrically enclosed inner ratcheting ring are mounted upon the cylinder end receiving the piston. This outer ratcheting collar mechanically and frictionally engages at least one of a plurality of serrations of the enclosed inner-ratcheting ring. The outer ratcheting collar and inner ratcheting ring firmly hold the piston, thus preventing inadvertent rotation and collapse of the piston during the shoring device application. There is also an internal circular air channel feature, which more quickly and evenly distributes compresses gas or air to the piston for lateral expansion thereof.

Abstract: A shoring system to support a vertical surface is provided. The shoring system includes a main frame including a first end and a second end and a first member connected to the main frame near the first end. A first,length adjuster is disposed in the first member and a second member is connected to the main frame near the second end. A second length adjuster is disposed in the second member and the first length adjuster and the second length adjuster connect to a base plate. A method for shoring a vertical surface is also provided.

Abstract: A shoring system to selectively support from below an elevated, relatively horizontal surface is provided. The shoring system includes a first vertical support member, a first vertical length adjuster disposed in the first support member, a second vertical support member spaced apart from and parallel to the first support member, a second vertical length adjuster disposed in the second support member and two horizontal structural members spaced apart from and parallel to each other. The first vertical support member, first vertical length adjuster, second vertical support member and second vertical length adjuster each connect to the two horizontal structural members so as to form a rectangular configuration. A method for shoring an elevated horizontal surface is also provided.

Abstract: A pneumatic jack energized from a container having a pressurized gas therein for rapidly and effortlessly lifting an object such as a motor vehicle including an automobile, a van, and a truck for one purpose of changing a tire that has gone flat is disclosed. The pneumatic jack has a housing with a piston slideably disposed in a chamber therein cooperating with a lifting element, a hose connected between the housing and the container, a gas fill valve and a throttle valve for controlling the pressure to the piston for raising and for maintaining the lifted object in an elevated position and a handle pivotally connected to the housing for manipulating the pneumatic jack for placement under the motor vehicle.

Abstract: The present invention provides a reusable support assembly for use with an excavated channel or hole. The assembly includes a support structure having a plurality of piles and a perimeter frame, and at least one bracing clamp, wherein the bracing clamp provides an adjustable support for the support structure. The invention also relates to a bracing clamp for providing an adjustable support to a support structure that is used with an excavated channel or hole. The bracing clamp includes two engaging members, at least one clamp stiffening device, and at least one adjustable clamp extension mechanism. The engaging members are located at opposite ends of an axis as defined by the clamp stiffening device and the adjustable clamp extension mechanism. In another embodiment of the invention the support structure includes a perimeter frame having a plurality of beams and a plurality of connectors for connecting two beams and securing said two beams in position.

Abstract: A trench sheeting device consists of trench sheeting boxes which are each made up of two trench plates supported against each other, the width of the trench apart, and at least one shaft sheeting box whose width exceeds that of the trench. The shaft sheeting box can therefore essentially be introduced into the ground with standard trench plates and with essentially the same elements as a plate of that type, that is, practically in one piece. To this end, the shaft sheeting box consists of a trench plate on each longitudinal shaft wall and shaft plates which are arranged at the longitudinal ends of the trench plates connected to the adjoining trench sheeting boxes, in such a way that they cannot move. The shaft plates are therefore positioned cross-wise to the longitudinal direction of the trench and the trench plates and are relatively narrow compared to the trench plates.

Abstract: A portable shoring device for securing the sidewalls of an excavation having a pair of walls or panels mutually facing each other and being held in spaced apart relationship by at least one support bar. Attached at opposite ends of each panel are vertical supports, which are arranged to pair in a substantially perpendicular coupling relationship with the corresponding vertical supports of the opposite panel. Each vertical support traverses along the height of the panel and has a female connection bracket. A plurality of panel connectors having a male connection device are slideably connectable with each panel by interlocking the corresponding female connection bracket of the corresponding vertical support with the male connection extension of the panel connector. The support bar attaches between two panel connectors on paired panels. Further, each panel connector has a bottom stop plate and a top panel lock to vertically secure the connected panel.

Abstract: A connection arrangement for temporary shoring in an excavation site is used to secure I-beams together at corners within the excavation site. Typically, four I-beams are connected together to form a rectangular frame that is suspended within the excavation for bracing the shoring walls thereof. However, any polygonal shape may be used. The connection arrangement includes mating socket or connecting members which are placed over the ends of I-beams to be fastened together. One of the connecting members includes an outwardly extended tab while the other includes a pair of outwardly extended tabs. The first outwardly extending tab fits between the two extending tabs of the corresponding connecting member. All of the tabs are provided with apertures which are placed in alignment when the connection is made so that a bolt or pin can be passed through the apertures to secure adjacent connecting members together.

Abstract: An apparatus for joining at least two or more wales of a shoring system including a first substantially rigid end-cap adapted to enclose an end of a first horizontally disposed wale, the first end-cap having a horizontally extending flange with a first vertically disposed aperture cut there through, a second substantially rigid end-cap adapted to enclose an end of a second horizontally disposed wale, the second end-cap having a horizontally extending flange with a second vertically disposed aperture cut there through of substantially the same diameter of the first vertically disposed aperture, a locking pin dimensioned to be slideably received by the first and second vertically disposed apertures when the first and second vertically disposed apertures are in substantial alignment with one another wherein a leading end of the first horizontally disposed wale and a leading end of the second horizontally disposed wale are oriented in substantially perpendicular fashion to one another and in relative proximity so

Abstract: A trench shoring system using panels as shoring walls to prevent possible collapse of natural ground walls of trenches in trenches such as for burying pipes underground, having a sliding panels type trench shoring system that offers increased safety during the job, and higher job efficiency.

Abstract: A sheeting device includes a column with two supporting surfaces in one guide channel. The second supporting surface is provided with an offset relative to the first supporting surface. The offset is both toward the middle of the column in the lengthwise direction of the trench and also in the transverse direction toward the wall of the trench, with one edge of an outer plate of the sheeting device abutting this second supporting surface. As a result of the two supporting surfaces that are offset with respect to one another in the lengthwise and transverse directions of the trench, the guide channel offers each of the plates support in extension of the lengthwise extent of the respective plate. Two inwardly projecting supporting edges on the outer plates are dispensable. Eliminating these supporting edges has the additional advantage that the stacked volume of the outer plates is reduced by approximately half.

Abstract: A trench shield includes a pair of shielding panels for protecting opposite side walls of a trench excavation, two side frames are provided for restively adjustably securing the two shielding panels on the two side frames, and have a plurality of brace members spaced between the two side frames for retaining the two side frames and the two shielding panels, and two rolling devices respectively are mounted on a front bottom portion and a rear bottom portion of the trench shield for carrying the trench shield to be ridable and movable on a pipe under construction in the trench excavation. Upon rolling of the rolling devices on the constructing pipe, the trench shield will be conveniently moved on the pipe without any obstruction.

Abstract: A trench shield includes: a pair of shielding wheels rotatably mounted on a pair of retaining plates; a plurality of brace members passing through two retaining plates for retaining the two shielding wheels, each shielding wheel formed as a protective circular panel for shielding a side wall of a trench excavation for preventing collapse of the trench walls; and two control devices each provided for locking or unlocking each shielding wheel on each retaining plate; whereby upon unlocking of the wheels from the retaining plates and upon rolling of the wheels in the trench, the trench shield will be forwardly moved conveniently and smoothly.

Abstract: An extensible shoring bar for bracing vehicle loads wherein telescoping tubular elements are spring biased toward an extended position for wedging the bar between the sides of a van or truck. An actuator interposed between the tubular elements includes a rotatable locking detent which automatically rotates between locking and release positions upon full retraction of the elements permitting the shoring bar to be locked in a retracted position for handling and positioning purposes, and by fully retracting the elements, the detent is automatically released permitting the elements to be expanded under the influence of a compression spring. The automatic locking and unlocking action of the actuator occurs upon sequential retractions of the tubular elements.

Abstract: A pneumatic/hydraulic shoring strut is disclosed for bracing walls in various situations. The shoring strut is provided with features that allow it to be infinitely adjustable and self-locking. In a preferred embodiment, the strut contains an internal biasing member that urges contraction when pneumatic pressure is released. More particularly, the pneumatic/hydraulic shoring strut of the present invention is composed of an inner and outer cylinder which form an annular recess therebetween. The cylinders are mounted in first and second caps and an annular drive piston is positioned within the annular recess, creating first and second chambers. A port for injecting air into the first chamber is mounted on the outer cylinder and hydraulic fluid is sealed in the second chamber. A channel is provided in one of the caps providing fluid communication between the second chamber and an interior cavity located within the inner cylinder where a working piston is reciprocatingly mounted.

Abstract: The invention concerns a device for lining a trench, hole, tunnel or other excavation, said lining device comprising vertical supports arranged in pairs opposite one another on both sides along the trench, wherein the supports have first guide channels for receiving the lining plates on both of their sides and second guide channels located on the inside of said supports for guiding a bracing frame, wherein said second guide channels define a gap formed by two flanges and have roller tracks on both sides thereof against which are supported rollers of the bracing frame capable of taking up compressive forces; at least one bracing frame disposed between two opposite supports, which bracing frame can be guided in a vertically displaceable manner by means of parts engaging in the second guide channels; and lining plates which can be guided in a vertically displaceable manner in the first guide channels of two adjacent supports; wherein at least one pulley assembly is mounted in the upper region of the bracing fram

Abstract: Proposed is a trench falsework which includes a base box (3) made up of lining panels (5) held apart by braces (8). The panels making up the box have a flat edge (7) along the top and a cutting edge (6) along the bottom. The falsework system also includes at least one add-on box (4, 12) designed to be used as an extra tier and made up of lining panels (5) which meet flush with those of the base box (3). The invention calls for the lining panels (5) making up the raised box (4, 12) to be of the same design as those in the base box (3).

Abstract: The invention concerns a housing (18), in a trench falsework panel, designed to hold the support shoe for a strut (17) so that the strut is secured in place at a spring joint. The housing permits the support shoe, which is directly associated with the strut, to be mounted simply in place by virtue of the fact that the longitudinal ends of the housing have a collar (21) projecting out from the surface of the panel, at a certain distance from the strut, with a bore running at right angles to the longitudinal axis of the housing, and the support shoe has a collar, matching that on the housing, with a bore, aligned with that in the housing collar, into which a bolt (25) can be inserted to hold the shoe in place.

Abstract: A lining plate intended for employment in connection with trench lining in below-grade construction becomes assembly- and removal-friendly and simultaneously resistant to flexural buckling even against forces acting during driving in by means of the excavator bucket, if a hollow profile plate structure, which forms the plate frame and is welded together with the remaining plate part, is provided, and if at least one suspension eye is cut into the plate surface a distance apart from the circumferential hollow profile frame elements, which contains a fastening means for a lifting means of the crane.

Abstract: A quick-release cam lock for selectively locking the relative position of a hydraulic cylinder and a piston. The quick-release cam lock permits speedy unlocking and repositioning of the hydraulic cylinder and its accompanying piston and oversleeve, thus allowing for speed in repositioning, assembly or disassembly while also providing a secure positive positioning lock between the hydraulic cylinder, piston and oversleeve while the quick-release cam lock is engaged.

Abstract: An improved movable trench shoring device having a trench box depending from a frame, the frame including a pair of end frame members, a pair of side frame members and a pair of cross frame members. A pair of wheel assemblies are mounted along either of the two sides of the device allowing the device to be rolled along the ground. Each end frame members are configured to accommodate a removable frame member extension which allows the width of the trench shoring device's wheel base to be widened. A trench box depends below the frame from a pair of vertical support members. A pair of offset spreader couplings attached to the trench box spreaders accommodate attachment of the trench box to the vertical support members in a manner which allows the trench box to be raised substantially above the elevation of the frame.

Abstract: A trench shield stacking bracket provided for facilitating the stacking of trench shields. The trench shield stacking bracket comprises an elongate hollow body frame which defines a pair of spaced apart trench shield spreader bar engaging Wall having upper and lower portions. The trench shield spreader bar engaging walls define upwardly opening trench shield spreader bar engaging slots in the upper portions thereof. The trench shield spreader bar engaging walls define downwardly opening trench shield spreader bar engaging slots in the lower portions thereof in opposed spaced apart register with the upwardly opening trench shield spreader bar engaging slots. Means are provided to selectively retain trench shield spreader bars selectively positioned within the upper and lower spreader bar engaging slots-during trench shield stacking operations.

Abstract: The invention concerns a panel for use in trench falsework as part of a box construction or in sliding forms in civil-engineering. The falsework is easy to mount in place and is resistant to buckling, even along the triangular hollow section which forms the cutting edge at the bottom of the panel, by virtue of the fact that the triangular hollow section incorporates single-piece steel suspension rings which have a partly rounded and partly straight outside circumference. The outside shape of the rings fits into the surface of the metal sheet surrounding the ring, the straight part of the rings forming part of the cutting edge and the rounded part of the rings being welded to the adjacent parts of the hollow section.

Abstract: A shoring device for supporting trench side walls during construction. The shoring device has opposite shoring shields having conventionally located spreaders adjacent the upper edge of the shields and a second pair of spreaders disposed at an upper location. A pair of auxiliary spreaders are associated with the shield assembly. Each auxiliary spreader member consists of a structural member having connectors at opposite ends which are detachably securable to the interior walls of the shields at a location below the horizontal center line of the shields to substantially increase the shield capacity. The auxiliary spreaders would be used primarily when the maximum pipe clearance is not required to achieve a greater load factor.

Abstract: A rotatable trench shield handling assembly provided with upwardly extending excavator hook-engaging means. The rotatable trench shield handling assembly provided with rear downwardly extending trench shield wall engaging means and with an opposed forward transversely positioned horizontally oriented trench shield wall engaging guide stabilizer bar means which cooperates with the rear spaced apart trench shield wall engaging means to positively and easily engage the trench shield so as to enable the excavator operator to have positive control of the trench shield while lifting, handling, lowering, and selectively stacking the trench shield into its operative use position within a trench and subsequently removing the trench shield therefrom.

Abstract: Joining arrangements (7) capable of swivelling around an axis bolt (6) are limited in their swivelling by one of the springs of a pair of springs (12, 13) welded together into a unit to make it possible to individually or alternately drive or pull opposite lining elements (1) of a canal lining system into or out of the soil without causing the braces (4) that prop the lining elements (1) against each other nor their joining arrangements (7) to be deformed.