260 results about "Weight-bearing ability" patented technology

This application discloses a side-folding trailer with a first and second side frame connected by cross bars and a lifting rod at the folding center. The side frames have a base frame assembly connected to the lifting rod. Sliding sleeves on each side of the crossbar set connect to the side frames. The crossbar set includes first, second, fifth, and sixth crossbars with offset centers, minimizing the lifting rod's downward movement. This prevents the lifting rod from interfering with the misaligned and overlapping wheels when folded, optimizing storage. The lifting rod suspending the base frame significantly enhances its load-bearing capacity. The invention relates to outdoor activity equipment and aims to provide a trailer that does not increase in height when folded, ensuring efficient storage and improved load-bearing capacity through its unique design features.

A modular rack system designed to be configurable for hauling various sizes and shapes of gear. The geometry of the rails in combination with corner supports allow components to be added or removed easily. Structural connection to the vehicle bed with or without a tonneau cover provides for offroad or heavy duty use. The rack is designed to fit within the aerodynamic profile of the vehicle to minimize its footprint when not in use. The lightweight construction, bracketry and vehicle connections allow the rack system to be removed from the vehicle without disassembly. When combined with a structural load carrying tonneau cover, gear can be supported by the cover aiding the load carrying capacity of the rack system. Height adjustment of the rack system provides clearance with the vehicle when carrying longer items.

The utility model belongs to the technical field of AGVs (Automatic Guided Vehicles), and relates to a lifting type heavy-load AGV capable of running stably, which comprises an AGV body, lifting plates which are arranged at four corners of the AGV body and are driven by a lifting mechanism to lift, four groups of steering wheels arranged at the bottom of the AGV body, and a navigation mechanism arranged on the AGV body, the AGV is characterized in that the two sets of steering wheels on each side of the AGV body are mounted on the AGV body through a first-stage balance mechanism, the first-stage balance mechanism comprises mounting groove frames, a rotary mounting frame and a first-stage balance rotating shaft, and the mounting groove frames with downward notches are fixedly mounted on the two sides of the bottom of the AGV body; a rotary mounting frame is rotationally mounted in the mounting groove frame through a first-stage balance rotating shaft, and steering wheels are symmetrically mounted at the front end and the rear end of the rotary mounting frame. The heavy-load AGV is scientific and reasonable in structural design, has the advantages of being simple in structure, stable in running, stable in loading, high in bearing capacity and easy to achieve, and is a heavy-load AGV with high innovativeness.

The invention relates to the technical field of mortise and tenon joint structures, and discloses a novel mortise and tenon joint structure spliced in a standard component form, which comprises a plurality of groups of structural units, and the structural units are provided with splicing parts arranged based on a yin-yang logic sequence; the splicing part comprises at least one male tenon and at least one female tenon; the male tenon is of a protruding structure, and the female tenon is of a groove or hole structure. According to the mortise and tenon joint structure, one-female-one-male infinite circulation serves as the logic, multi-direction meshing is supported to achieve three-dimensional splicing, compatible splicing can be achieved through any materials and sizes, and through half-opening meshing, overall locking design and precise size and tolerance control, the mortise and tenon joint structure can be assembled in a one-female-one-male mode. The stability and the bearing capacity are greatly improved, the science popularization value of traditional woodworking skill display and engineering mechanics is achieved, the intelligence development performance is high, combination is diversified, the problem that a traditional splicing mode is single is solved, and small mortise and tenon joints and large intelligence are achieved.

This application discloses a door hinge for a micro-pressure oxygen chamber, belonging to the field of micro-pressure oxygen chamber technology. It includes a fixed component and a rotating component, which are rotatably connected. The rotating component is equipped with a bearing assembly, which drives the fixed component to rotate. This application reduces the coefficient of friction during the rotation of the rotating shaft by setting multiple bearings at the top and bottom of the pin and the rotating shaft. Furthermore, the cooperation of the retaining ring and bearings ensures the rotational accuracy of the rotating shaft, thereby ensuring easy opening and closing of the micro-pressure oxygen chamber door. Multiple bearings distribute the force, extending the hinge's service life. The addition of a reinforcing plate increases the hinge's load-bearing capacity, preventing wear and deformation even after prolonged use. This prevents the door from shifting, better ensuring the door's sealing effect and improving user comfort. The hinge is simple to install, has a reliable fixing method, high load-bearing capacity, and an aesthetically pleasing appearance.

The utility model relates to a reinforcing structure, belongs to the technical field of foundation reinforcing construction, and particularly relates to a reinforcing structure at a connecting joint of a building load-bearing wall and a raft foundation, which comprises the raft foundation, a plurality of first steel-concrete walls are fixedly mounted on the surface of the raft foundation, and a plurality of second steel-concrete walls are fixedly mounted on the surface of the raft foundation. A second steel-concrete wall body is fixedly installed on the peripheral wall of each first steel-concrete wall body, and a plurality of embedded steel bars are jointly and fixedly installed in the raft-shaped foundation and the inner bottom of the second steel-concrete wall body; the effects that the bearing capacity is enhanced, and a building is more stable are achieved, and the problems that an existing reinforcing structure is poor in bearing capacity, lack of steel bar supporting, not firm enough in connecting point, and insufficient in foundation bearing capacity and building safety coefficient are solved.

The present invention relates to a special anti-deformation material and box structure for pallets, and belongs to the technical field of transport box structures. The box structure includes a base, a cover plate, two first side plates, two second side plates and a plurality of pull rods. The bottoms of the two first side plates are clamped on the base, the bottoms of the two second side plates are clamped on the base, and the two first side plates and the two second side plates are clamped together to form a circular structure through the side ends. A plurality of the pull rods are clamped in an array between the tops of the two first side plates. The two first side plates are provided with a latch assembly, and the bottom of the cover plate is clamped on the tops of the two first side plates and the two second side plates. By ensuring the firmness of the box structure while adopting a wave structure for lightweight design, and the various components are all detachable, which is convenient for transportation and installation, the box structure as a whole has good load-bearing capacity, is stable and has good buffering performance.

The utility model provides a kind of large-tonnage portal crane's supporting leg structure, including rigid supporting leg, flexible supporting leg and the main beam of connecting rigid supporting leg and flexible supporting leg;Rigid supporting leg includes two symmetrically arranged first supporting legs, the upper end of two first supporting legs is provided with first support seat, the downside middle part of first support seat is provided with inverted V-shaped gap, the inclined side surface of the both sides of inverted V-shaped gap is opposite to the side surface of first supporting leg and is located in the same plane;The lower end of two first supporting legs is connected by first ground beam, and the downside of first ground beam is provided with travelling trolley;Flexible supporting leg includes two symmetrically arranged second supporting legs, the top of two second supporting legs is provided with wedge-shaped gap correspondingly, two wedge-shaped gaps are docked, the lower end of two second supporting legs is connected by second ground beam, and the upper end of two second supporting legs is provided with second support seat.The large-tonnage portal crane's supporting leg structure is more stable, and the bearing capacity is stronger, not easy to deform, suitable for being applied to large-tonnage portal crane.

The utility model relates to a steering wheel, in particular to a steering wheel with high stability, which comprises two fixing plates, a transmission system and a steering system, the transmission system and the steering system are arranged on the two fixing plates, the transmission system comprises a walking driving motor and a wheel arranged on one side of the walking driving motor, and an input shaft is arranged on the walking driving motor. An output helical-tooth sun gear, an output helical-tooth planet gear and an output helical-tooth gear ring are sequentially arranged on the outer side of the input shaft, the output helical-tooth sun gear and the output helical-tooth planet gear are each provided with a helical-tooth structure, and the steering system comprises a steering connecting flange and a steering driving motor fixed to the lower end face of the steering connecting flange; the output end of the steering driving motor is connected with a straight tooth gear, and a slewing bearing outer ring and a slewing bearing inner ring are sequentially arranged at the end, away from the steering driving motor, of the straight tooth gear. According to the steering wheel, the two sides of the wheel are supported through the two fixing plates, so that the bearing capacity is higher, and the overall stability is improved.

The present application relates to the technical field of shipbuilding plant, especially to large tonnage ship, ship modularization, digital construction technology, in particular to a kind of support frame structure of shipyard load floor;Including the support rod of section being "T" shape, also include the connecting rod or connecting plate being arranged in the both sides of support rod.The above-mentioned "T" shape support rod and its accompanying connecting rod structure proposed in the present application are easy to mass production and have guaranteed quality, at the same time, I-beam or rail is used as support rod, which has stronger load capacity, and avoids the quality risk of thick plate welding, at the same time, the load floor proposed in the present application connects support member with floor reinforcement during manufacturing process, so that after concrete pouring and solidification, higher "integrity" and bearing capacity can be realized, and the problems of floor collapse and cracking caused by long-term load in later period are avoided.

The utility model provides a supporting device of a printing and dyeing machine arrangement frame, which relates to the technical field of arrangement frame supporting and comprises a bottom mechanism, the bottom mechanism comprises two sleeve frames, a connecting frame is arranged between the two sleeve frames, and a reinforcing frame is arranged on the sleeve frames. According to the pulley fixing device, the embedded frame is plugged into the sleeve frame, then a worker can place the pulley at the position, corresponding to the embedded frame, of the sleeve frame, and then the worker can fix the pulley by attaching the protective pad and rotating the mounting pin to enable the mounting pin to penetrate through the protective pad, the embedded frame and the sleeve frame in a threaded rotation mode. In this way, a worker can push the supporting frame more conveniently, one end of the supporting frame is welded to the sleeve frame, and the supporting frame and the sleeve frame are connected and reinforced through the reinforcing frame, so that the bearing capacity of the supporting frame in the actual use process is improved, and the practicability of the supporting frame in the actual use process is improved.

The utility model discloses a multi-degree-of-freedom mechanical arm mechanism and a mining lagging jack trolley, the multi-degree-of-freedom mechanical arm mechanism comprises a mechanical arm, rotating arms and a connecting arm, the rotating arms comprise a first rotating arm, a second rotating arm and a third rotating arm, the second rotating arm is connected with the first rotating arm, the second rotating arm is perpendicular to the first rotating arm, and the third rotating arm is connected with the connecting arm. One end of the connecting arm is connected with the second rotating arm, the other end of the connecting arm is connected with the third rotating arm, the third rotating arm is perpendicular to the second rotating arm, and the manipulator is connected with the third rotating arm; connecting rods used for being connected with a hanging basket are arranged on the two sides of the connecting arm, and through holes are formed in the connecting rods; and the manipulator is also provided with a through hole connected with the hanging basket. The mechanical arm mechanism has the effects that the use freedom degree of the mechanical arm mechanism is improved, and the bearing capacity of the end of the mechanical arm mechanism is optimized.

This utility model relates to the field of building engineering and discloses a load-bearing polyurethane floor panel, including a top panel and a bottom panel. A rigid polyurethane foam board is disposed between the top panel and the bottom panel, and a load-bearing mechanism is also disposed between the top panel and the bottom panel. The load-bearing mechanism includes a support plate, the upper surface of which is fixedly connected to the lower surface of the top panel, and the lower surface of which is fixedly connected to the upper surface of the bottom panel. A triangular groove is formed on the inner wall of the support plate, and a connecting strip is fixedly connected to one end of the support plate away from the middle of the top panel. A connecting component is disposed on the outside of the connecting strip. In this utility model, through the arrangement of the top panel, bottom panel, rigid polyurethane foam board, and load-bearing mechanism, the support plate is shaped to ensure that the rigid polyurethane foam board remains in an intact structure, and the support plate can maintain the stability of supporting the top panel through its remaining shape, thereby achieving the effect of protecting the integrity of the rigid polyurethane foam board and increasing the load-bearing capacity of the equipment.

The utility model discloses a hook structure, including the fixed plate of fixed on the wall surface, the fixed plate is equipped with the hook body on the side of wall surface's back, the fixed plate is equipped with the pasting layer on the side of wall surface's face, the length of the fixed plate along the direction of perpendicular ground is L, the hook body is used for hanging the heavy object, the hook body includes the connecting portion, the highest point of connecting portion and the distance of the bottom end of fixed plate's projection length in the direction of perpendicular ground is H, wherein 18%L <= H <= 50%L. The utility model has the advantages of can even distribution stress, strengthen the bearing capacity and improve the back glue adhesion stability.

The application belongs to the field of automobile parts, and provides a leg support structure and a four-way leg support, which comprises a leg support framework, an extension framework, a guide arm and a support arm, wherein: the extension framework is slidably arranged on the leg support framework to perform extension and contraction movement relative to the leg support framework; one end of the guide arm is movably connected to the leg support framework, and the other end is movably connected to the support arm. Compared with the prior art, the application has the advantages that through the guiding effect of the guide arm, the support arm is positively rotated to form stable support below the extension framework when the extension framework is extended in cooperation, effectively solving the problem of insufficient bearing capacity or easy deformation of the traditional leg support after being extended, significantly improving the structural stability and bearing safety of the leg support in the unfolded state; at the same time, the automatic hiding of the guide arm and the automatic contraction of the support arm are realized when the extension framework is retracted, depending on the structural design of the guide hole, greatly saving the storage space, and also improving the overall appearance.

The utility model discloses a heavy industrial caster which comprises a bearing bottom plate, a caster body, a caster support, a connecting shaft, a connecting sleeve and a plurality of steel balls, the caster body is in pin joint with the bottom of the caster support, the top of the caster support is fixedly connected with the connecting sleeve, a first annular groove is formed in the inner ring of the connecting sleeve, and a steel ball filling opening is formed in the side wall of the connecting sleeve. A second annular groove is formed in a shaft body of the connecting shaft, the connecting shaft is connected into the connecting sleeve in an inserted mode, the first annular groove and the second annular groove form an annular roller path, the steel balls enter the annular roller path through the steel ball filling opening, and a boss is fixedly arranged on the upper portion of the connecting shaft. A plurality of connecting holes connected with a carrier are formed in the edge of the bearing bottom plate. According to the heavy industrial trundle, the overall strength and the bearing capacity of the trundle are enhanced, the service life of the trundle is prolonged, meanwhile, the effect that one brake mechanism controls the trundle to move and rotate is achieved, and the heavy industrial trundle is high in reliability and low in cost.

The utility model relates to the technical field of building construction material storage, and discloses an assembly type steel bar stacking frame which comprises a supporting stand column, a first cross beam, a second cross beam and a bolt assembly, assembly assemblies are arranged between the supporting stand column and the first cross beam and between the supporting stand column and the second cross beam, and an installation assembly is arranged between the upper end and the lower end of the supporting stand column. According to the steel bar stacking device, through the installation assemblies and the reinforcing ribs, by means of the through holes in the installation bottom plate and the studs on the installation top plate, the corresponding number of supporting stand columns can be flexibly assembled according to the height of steel bars needing to be stacked. By arranging the reinforcing ribs of the clamping grooves and the column tops of the flat-top conical structures, the stress peak value of nodes among the supporting stand columns, the first cross beams and the second cross beams is reduced to be lower than the yield strength of materials, and therefore the stability and the bearing capacity of the whole steel bar pile frame structure are improved.

According to the radial bearing profile, the triangular cavities which are symmetrical left and right are formed in the top bearing structure, and the rectangular cavities are formed in the middles of the triangular cavities, so that the bearing capacity of the top is improved, and the rectangular cavities are formed in the middle bearing structure from top to bottom; therefore, the radial bearing capacity in the vertical direction is improved, and meanwhile the high load ratio is increased. In addition, the top bearing structure and the bottom bearing structure are respectively provided with bearing mounting grooves and optical axis mounting grooves which are uniformly distributed, so that the function expansibility is achieved.

The utility model discloses a linkage type supporting frame and an airing device applying the linkage type supporting frame, the linkage type supporting frame comprises a shear shank mechanism and a linkage mechanism movably connected with the shear shank mechanism, the shear shank mechanism comprises two main rods hinged in the middle, and the linkage mechanism comprises a linkage rod. The two ends of the linkage rod are movably connected with two main rods of the shear shank mechanism respectively. The linkage rod can change between the position not parallel to the main rod and the position parallel to the main rod. When the linkage rod is parallel to the main rod, the linkage rod is located on the outer side face of the main rod. The airing device comprises a pair of supporting frames and a transverse airing rod arranged at the tops of the supporting frames, and the supporting frames are the linkage type supporting frames. The linkage type support frame can be directly used as a main body structure of an X-shaped floor type drying rack, and a linkage mechanism is additionally arranged on the basis of a traditional shear shank structure, so that the overall bearing capacity can be effectively improved. The airing device adopts the linkage type supporting frame, and is convenient to use and high in bearing capacity.

The utility model discloses a flat folding cart which comprises a front supporting frame, a rear supporting frame, a left side folding frame, a right side folding frame and a bottom folding frame. The side folding frame comprises at least one X-shaped cross rod, the upper ends of the left and right sides of the X-shaped cross rod are longitudinally and slidably connected with the two supporting frames respectively, and the lower ends of the X-shaped cross rod are movably riveted with the lower ends of the two supporting frames respectively; and the two ends of the suspender positioned below the bottom folding frame are movably riveted with the two side folding frames respectively. The suspenders are arranged to be connected with the side folding frames to assist the bottom folding frame, so that the loading bearing capacity of the bottom folding frame is enhanced, and the use stability of the cart is improved; flat folding of the stroller is achieved through folding of the bottom folding frame and the side folding frames, occupied space is reduced when the stroller is not used, and the height of the whole stroller is not increased after the upper ends of the side folding frames longitudinally slide and are folded when the side folding frames are folded.

The utility model belongs to the technical field of cable bridges, and particularly relates to a novel mould pressing bridge which comprises a bridge body and a structure reinforcing assembly arranged on the surface of the bridge body, and the structure reinforcing assembly comprises a top cover arranged on the upper surface of the bridge body. The upper surface of the bridge main body is further symmetrically and fixedly connected with sliding rails, the top cover is slidably connected with the bridge main body through the sliding rails, the inner side surfaces of a bottom plate and side plates of the bridge main body are symmetrically and fixedly connected with a plurality of reinforcing ribs, and the inner side surfaces of the side plates of the bridge main body are further provided with corrugated grooves; the device is light in weight and high in bearing capacity, the bending strength is improved, the working temperature of the cable can be reduced, meanwhile, the side plates and the top cover are connected through the buckles, and the working efficiency is improved.

The utility model relates to the technical field of glass high-pressure laminating tools, in particular to a high-pressure shelf which comprises a shelf body and supporting pieces. The shelf body is provided with a plurality of supporting force arms which are arranged in parallel at intervals, and the supporting pieces are supported between every two adjacent supporting force arms in the vertical direction. According to the utility model, the supporting piece is supported between the two adjacent supporting force arms, so that the supporting force arms suspended on the shelf body cannot deform and droop due to the stress of the supporting force arms. Therefore, the stability and the bearing capacity of the whole structure are enhanced.

1. Name of this design product: fastener. 2. Purpose of this design product: used to fix the steel base and increase its load-bearing capacity. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The sliding support structure for the window comprises a base, a first connecting rod, a second connecting rod, a third connecting rod, a connecting piece and a first sliding block, a first sliding groove is formed in the top of the base, and the first sliding groove extends in the length direction of the base; according to the structure, the first connecting rod, the second connecting rod, the third connecting rod and the first sliding block are arranged to form a connecting sliding mechanism, the third connecting rod is a main stress connecting rod, the third connecting rod is hinged to the second connecting rod to form a supporting point, the bearing capacity of the third connecting rod is improved, and therefore the mode similar to hinge shaft stress is achieved; the bearing performance of the sliding support structure is well improved, and the whole structure is practical and reliable.

The utility model relates to the field of steward seats, in particular to an aerial steward seat protection device which comprises an L-shaped plate, a bearing assembly is arranged on the surface of the L-shaped plate, a limiting assembly is arranged on the surface of the L-shaped plate, the bearing assembly comprises a square plate arranged on the surface of the L-shaped plate, an extension plate is fixed to the surface of the bottom of the square plate, and a U-shaped block is fixed to the inner wall of the extension plate. A concave hole is formed in the surface of the U-shaped block, an L-shaped frame is fixed to the surface of the square plate, a seat plate is installed on the inner side of the L-shaped frame through a rotating shaft, a limiting block is fixed to the surface of the bottom of the seat plate, and a through hole is formed in the surface of the limiting block. The bearing assembly is provided with the square plate and the extension plate, the extension plate can support the seat plate, the bearing capacity of the seat plate is improved, the thickness of the seat plate is increased, the firmness of the bearing part is guaranteed, when an aerial crew uses the seat plate, the L-shaped plate and the extension plate can support the seat plate, and therefore the pressure received by the seat plate is dispersed, and the service life of the aerial crew is prolonged. The service life of the seat plate is prolonged.

A double-end saw mounting frame relates to the technical field of double-end saws and comprises a bottom plate and a top plate, the bottom plate and the top plate are fixedly connected together through a front plate and a rear plate, an abutting plate is arranged on the top plate, fixing components are arranged between the abutting plate and the top plate, and fixing components are arranged between the bottom plate and the front plate and between the bottom plate and the rear plate. The bottom plate, the top plate, the front plate, the rear plate and the abutting plate are made of thick steel plates, vibration is effectively restrained, and saw cutting precision is improved; the stability and the bearing capacity of the whole structure are remarkably enhanced through the fixing components, the side plates, the triangular supporting plates and other structures. The design of the chip leaking holes in the bottom plate realizes the lightweight design of the bottom plate.

The utility model discloses a folding cart with good bearing performance, which comprises a folding frame, a main connecting piece and an expansion connecting piece, the folding frame is a trailer rear opening type frame body, the front side and the rear side of the folding frame are respectively provided with a telescopic handle and a folding push handle, the folding frame comprises a bottom folding frame and a side folding frame arranged on the bottom folding frame, and the main connecting piece is connected with the main connecting piece. Wherein the bottom folding frame and the side folding frames are formed by hinging a plurality of crossed supporting rods, the adjacent crossed supporting rods on the bottom folding frame and the side folding frames are connected through main connecting pieces, and the crossed supporting rods at the upper ends of the side folding frames are connected through expansion connecting pieces. And key structural components such as the load-bearing hinge seat are adopted, so that the folding cart has high load-bearing capacity and can meet the transportation requirements of heavy-weight articles. According to the utility model, the expansion connecting piece, the adjusting function and the load-bearing strengthening design are added in the folding cart design, so that the multifunctionality, the load-bearing capacity and the stability of the product are obviously improved.

The invention relates to a pipeline supporting device. The pipeline supporting device comprises a base mechanism, a bearing mechanism, a buffering mechanism and an adjusting mechanism, the base mechanism comprises a mounting plate and a first fastener, the mounting plate is provided with a mounting hole, and the first fastener is used for being arranged in the mounting hole in a penetrating mode to be connected with a concrete foundation. The bearing mechanism is movably arranged on the side, away from the concrete foundation, of the mounting plate. One end of the buffering mechanism is connected with the mounting plate, the other end of the buffering mechanism is connected with the bearing mechanism, and the buffering mechanism is used for providing elastic supporting force for the bearing mechanism. One end of the adjusting mechanism is connected with the mounting plate, the other end of the adjusting mechanism is connected with the bearing mechanism, and the adjusting mechanism is used for adjusting the distance between the bearing mechanism and the base mechanism. The pipeline supporting device has the advantages of being high in bearing capacity and low in maintenance difficulty.

The utility model provides a sofa with an improved mounting mode, which comprises a support frame, a mechanical stretching device and two armrest parts, the mechanical stretching device is mounted on the support frame, and the support frame is mounted on the armrest parts; the supporting frame comprises at least two bearing parts, the bearing parts are arranged between the two handrail parts in the left-right direction, and the mechanical stretching device is supported above the bearing parts in the front-back direction; the supporting frame is used for reinforcing the structure and increasing the bearing capacity, the overall structure is more stable and firmer after the handrail pieces on the two sides are connected through the supporting frame, the mechanical stretching device is stably installed on the bearing piece on the premise that the ground clearance is not reduced, the strength of the installation structure is guaranteed, extra supporting legs for bearing are not needed, and the installation cost is reduced. The mechanical stretching device cannot protrude downwards to the height of the supporting legs through the bearing part, so that the ground clearance cannot be reduced, and the armrest and the supporting legs do not need to be additionally arranged in the middle of the multi-seat sofa.

The invention provides a cofferdam hoisting and lowering construction device and method, and relates to the technical field of bridge construction.The cofferdam hoisting and lowering construction device comprises a double-wall steel cofferdam, a steel trestle and a steel cofferdam lowering platform, the double-wall steel cofferdam jointly resists water pressure through inner and outer wall double layers and internal angle steel supports, and the water insulation effect on bearing platform construction is achieved; a steel trestle is erected on one side of the periphery of an inlet of the double-wall steel cofferdam, a platform below the steel cofferdam is erected on the other three sides of the periphery of a lowering inlet of the double-wall steel cofferdam, the steel cofferdam is connected with a stressed bailey truss girder during lowering construction of the double-wall steel cofferdam, and a jack which is easy to operate and high in bearing capacity serves as a power device. And the steel cofferdam is hoisted and lowered in sections, so that the lowering synchronism of the steel cofferdam is good, the accuracy is high, and the process is stable and good in controllability.