1183 results about "Stringer" patented technology

A bed skeleton of an iron frame bed comprises a rectangular frame, a plurality of frame rods, and two or three longitudinal beams. The rectangular frame comprises two transverse rods and two longitudinal rods. A length of each of the two transverse rods is greater than a length of each of the two longitudinal rods. The two or three longitudinal beams divide the rectangular frame into three or four individual cells. The plurality of frame rods are evenly disposed in the three or four individual cells. Each of the plurality of frame rods is arranged transversely. A length of each of the plurality of frame rods is shorter than a length of each of the two or three longitudinal beams, and each end of each of the plurality of frame rods is connected to one of the two longitudinal rods or one of the two or three longitudinal beams.

The invention discloses a PIN wire steel plate lifting mechanism and a control method, and relates to a PIN wire steel plate lifting mechanism which comprises a lifting module, a grabbing and sucking module and a fixing frame. The lifting module is in linkage with a lifting driving assembly through a ball screw, and high-precision lifting is achieved. The grabbing and sucking module comprises array type vacuum suction cups, a pressure regulating valve set and an air cylinder, the stability is enhanced through a cross-shaped transverse beam frame and a cross-shaped longitudinal beam frame, and 360-degree posture adjustment is achieved by carrying a hollow platform rotating assembly. The fixing frame is connected with the sliding base, so that the mechanism moves along the linear track, and the steel plates are conveyed. The control module integrates a visual system and a laser displacement sensor, positions the position of the steel plate and a hole site in real time, scans a three-dimensional contour, detects whether the steel plate deforms on line based on a hole site and aperture comparison method, automatically triggers a sorting alarm when a detection result exceeds a threshold value, and adopts a graded pressure relief technology in a release process to ensure soft landing of the steel plate. According to the scheme, the stability of the lifting process of the PIN wire steel plate is improved, the comprehensive efficiency of a full-process automatic production line is improved, and the reject ratio of products is reduced.

The embodiment of the invention provides a station assembling trolley. The station assembling trolley comprises a wheel rail walking device, a frame, a side wall mounting device, a longitudinal beam mounting device and a top plate mounting device. Wherein the wheel rail walking device is arranged at the bottom of the frame and can walk along a track on a platform bottom plate; the side wall mounting device is arranged on the frame and is used for fixing side wall blocks and driving the side wall blocks to move to a side wall mounting position for splicing; the longitudinal beam mounting device is arranged on the frame and is used for fixing a longitudinal beam and moving the longitudinal beam to a target position for splicing; the top plate mounting device is arranged on the frame and used for bearing a top plate and moving the top plate to a target position to be spliced. The station assembling trolley provided by the embodiment of the invention is suitable for the scene of laying temporary steel beams above the station, the trolley is used for carrying and assembling the side wall blocks, the longitudinal beams and the top plate, and the station assembling trolley has high construction efficiency.

The invention relates to the technical field of composite material forming, in particular to T-shaped stringer pre-forming equipment which comprises a rack extending in the length direction and comprising fixed platforms arranged on the two sides and a lifting platform arranged in the middle. The side mold assemblies are arranged on the two fixed platforms, each of the two side mold assemblies comprises a side mold capable of relatively sliding in the width direction of the fixed platforms and a linear driving part, and clamping openings of the two side mold are arranged towards each other; the middle mold assembly is fixedly connected to the middle lifting platform, and the middle mold assembly comprises two middle molds with clamping openings deviating from each other and a first clamping driving piece used for driving the two middle molds to be opened or closed; according to the T-shaped stringer forming die, the two prepreg sheets are clamped through the side die assemblies and the middle die assembly at the same time, the two opposite L-shaped sheets are formed in the descending process of the middle die assembly, and then the T-shaped stringer is formed through relative close joint of the two side die assemblies, so that the forming quality and efficiency of the T-shaped stringer are improved.

The invention discloses a method for analyzing the strength stability of a composite material wallboard, which comprises the following steps of: 1) carrying out a wallboard strength test on a wallboard structure of a T-shaped stringer disconnected at a rib position to obtain test data required in the method for analyzing the strength of the wallboard; 2) performing finite element simulation on the BVID damage with the lowest residual strength in the wallboard in the same configuration and same loading mode in the wallboard strength test; 3) based on the finite element simulation in the step 2), establishing a multi-configuration wallboard finite element model; and 4) based on the multi-configuration wallboard finite element model in the step 3), fitting to obtain a correction coefficient, and determining a strength stability analysis method.According to the method, the defects of a classical wallboard strength engineering algorithm in stringer support condition simulation, layering applicability, BVID damage and initial geometric defect influence are overcome.

The utility model provides a prefabricated assembly type UHPC-profile steel combined bridge deck structure suitable for a trestle. The prefabricated assembly type UHPC-profile steel combined bridge deck structure comprises a reinforced concrete prefabricated slab, a first connecting part and a second connecting part. The number of the reinforced concrete prefabricated slabs is multiple, and the multiple reinforced concrete prefabricated slabs are flatly laid on a longitudinal beam of a trestle bailey beam. The first connecting part is arranged between the reinforced concrete precast slab and the longitudinal beam and is used for detachably connecting the reinforced concrete precast slab to the longitudinal beam; and the second connecting part is arranged between the two adjacent reinforced concrete prefabricated slabs and is used for mutually splicing the two adjacent reinforced concrete prefabricated slabs. The bridge deck structure is convenient and fast to construct, high in strength and toughness, good in driving comfort and good in durability.

The invention provides a multi-slice high-speed series welding machine device which comprises a complete machine and further comprises an input part at the head section of the complete machine, a strip winding part is arranged in the input part, and a welding part is arranged in the middle section of the complete machine. The welding part comprises a silicon wafer transmission unit, a silicon wafer connection unit, a pressing net input unit, a pressing net body, a glue injection unit, a pressing net backflow unit, a welding unit and a belt manufacturing unit which are arranged on one side of the belt winding part, and a welding output part is arranged at the tail section of the whole machine; the pressing net body comprises an outer frame structure, a pressing strip, a gluing structure, a glue storage structure and a glue filling structure which are arranged on the pressing net backflow unit, through the double-rail design, the two battery piece connecting modules and the drawstring assembly which are arranged in parallel are adopted, welding of double-row battery strings is completed cooperatively, and compared with a traditional single-row welding mode, the welding efficiency is remarkably improved, and the production cost is reduced. And through optimization of material distribution, net pressing backflow, feeding carrying and the like, efficient operation and continuous production of the equipment are guaranteed, and the device is particularly suitable for large-scale and efficient battery piece welding operation.

The invention discloses a T-shaped composite material stiffened wallboard co-curing forming mold and a forming method, in a wallboard forming mold in the forming mold, the forming molded surface of the upper end face of a mold frame is consistent with the outer molded surface of a skin of a stiffened wallboard and is used for paving and forming a combination of a skin blank and a T-shaped stringer blank on the skin blank; and co-curing and forming the stiffened wall plate. The T-shaped stringer blanks are arranged on the skin blank in an inverted mode at intervals; an edge cleaning strip is placed on the end face of a web of each uncured T-shaped stringer blank, the two sides of each T-shaped stringer blank are each provided with an L-shaped core mold, the upper portions of the L-shaped core molds are arranged on the two sides of the corresponding edge cleaning strip in a clamped mode, a soft mold is placed between every two adjacent T-shaped stringer blanks, and all the soft molds are placed on uncured skin blanks; and the outer sides of the L-shaped core molds on the two sides of the T-shaped stringer blank are clamped and fixed through a bow-shaped clamp. According to the method, the problem that the quality of the stiffened wall plate is difficult to meet the product requirement to different degrees due to the existing co-curing stiffened wall plate mode is solved.

Implementations of the disclosed subject matter provide a system including a truss that may have a plurality of bays. Each bay may include a plurality of longerons disposed in a longitudinal direction, a plurality of battens disposed in a transverse direction, and at least two longitudinal struts that are coupled by hinges that are configured to allow the at least two longitudinal struts to fold towards an interior of each bay of the truss, where at least one batten may connect and separate at least one longitudinal strut. The longitudinal struts, the longerons, and the battens may be connected to form the bay, where each side of the bay may be formed from two battens that are joined end-to-end, and where at least some of plurality of battens respectively separate at least some of the plurality of longerons. The truss may be configured to be stowed longitudinally and transversely.

The invention discloses a thermomechanical treatment method for manufacturing a high-performance ribbed shell section, and belongs to the technical field of high-performance precision plastic forming manufacturing. According to the method, firstly, through high-temperature multidirectional forging cogging, medium-temperature rectangular ring rolling and high-temperature in-mold forging and rolling composite forming, near-net forming of the ribbed shell section, coarse crystal phase crushing and refining and grain refining are achieved; and finally, through the design of solid solution, in-mold cold rolling and aging, the problem that cold deformation is discontinuous and uneven due to a split mold structure in an existing ring piece cold bulging process is solved, accurate shape correction, residual stress reduction and performance improvement are achieved, and the product quality is improved. And the high-performance near-net plastic forming and high-performance manufacturing requirements of a key structural part, namely a ribbed shell section, of an aerospace carrier are met.

The invention relates to a semitrailer frame combination tool and a manufacturing method thereof. A limiting mechanism comprises a hood, a bearing plate rotationally installed on one side of the hood and limiting units arranged on the bearing plate in a sliding mode and matched with two longitudinal beams correspondingly. The supporting frame can be used for lifting the transverse edge beam when the transverse edge beam is not completely fixed, so that the parallelism of the welded and formed transverse beam is guaranteed; the whole frame is driven by the turnover limiting mechanism to turn over together, and the posture of the frame can be adjusted according to the welding position when the connecting beam and the suspension are welded, so that the welding difficulty is reduced; the longitudinal beam is centered, positioned and clamped in the mode that the two clamping plates and the two positioning plates are gathered together, the limiting mechanisms at the two ends are kept coaxial, overturning can be accurately achieved, and the levelness of a frame before and after overturning is kept unchanged.

The invention provides a wing panel stringer skin accurate butt joint device and a use method. According to the method, the actual space pose of the skin is determined through a composite skin forming mold, and then the theoretical space pose of the stringer is calculated; space attitude adjustment is conducted on the stringers to be in butt joint through the numerical control attitude adjusting and positioning structure, the stringer accurate positioning device grabs and positions the stringers and accurately moves the stringers in the X direction and the Y direction, finally the stringers are accurately positioned and pressed on the composite material skin, and accurate butt joint of the stringers and the skin of the composite material wing wall plate is achieved.

The invention provides a construction method across a natural gas pipeline, which comprises the following steps of: 1, determining a protection scheme of a cover plate (4.8 m wide C30 prefabricated reinforced concrete plate with the two ends prolonged by more than or equal to 3m) and a steel trestle (5 spliced 32a I-shaped steel longitudinal beam with the limited weight of 70t), and completing pre-approval such as safety evaluation and circumferential weld detection; 2, the pipeline is explored through an artificial exploring groove, a 5m iron gauze and 10m hard isolation are arranged, and fine soil is backfilled to protect the pipeline; 3, adjacent pipeline pile foundations are subjected to rotary excavating construction, damping ditches are excavated, trial hoisting installation is carried out when the strength reaches 85% after cover plates are prefabricated, and steel trestle foundations, steel structures and guardrails are constructed step by step; 4, regularly monitoring the operation period of the trestle, and hoisting the components away from the pipeline range during dismantling; the method meets the requirements of multiple laws and regulations, can effectively control the disturbance of construction to the pipeline, and is suitable for the natural gas pipeline crossing engineering of highway bridges and shortcuts.

The present disclosure provides a vehicle structural member. A vehicle includes a frame having a longitudinal rail and a structural member supported by the frame. The structural member includes a front bracket joined to the stringer and having an arm extending outwardly away from the stringer. The structural member also includes a curved elongate member having a first end connected to an outer end of the arm and extending rearwardly therefrom to a second end spaced from the stringer. A rear bracket of the structural member is connected to the stringer and defines a slot that receives the second end of the curved elongate member therein. The width of the slot is wider than the width of the second end such that the second end can slide rearward within the slot.

The invention belongs to the technical field of rolling mill equipment installation, and particularly relates to a screw-down cylinder hoisting device and an application method thereof.The screw-down cylinder hoisting device comprises an installation base, and the installation base is formed by combining two H-shaped steel cross beams and four H-shaped steel longitudinal beams; the two H-shaped steel cross beams and the two H-shaped steel longitudinal beams in the middle are combined to form a mounting part for accommodating the screw-down cylinder, and supporting plates for placing the screw-down cylinder are arranged on the lower flanges of the H-shaped steel cross beams and the H-shaped steel longitudinal beams; and stabilizing devices are arranged on upper flange plates of the H-shaped steel cross beams and the H-shaped steel longitudinal beams of the mounting parts and used for stabilizing the position of the screw-down cylinder. According to the lifting device provided by the invention, the mounting part is arranged on the mounting base, the screw-down cylinder is arranged in the mounting part, and the position of the screw-down cylinder is stabilized through the stabilizing device, so that the lifting process of the screw-down cylinder is safer through the lifting device provided by the invention. According to the hoisting method provided by the invention, the screw-down cylinder and the rolling mill body equipment are synchronously mounted, the screw-down cylinder pipeline and the rolling mill hydraulic system pipeline are simultaneously subjected to oil flushing, the construction period is shortened, the labor cost is reduced, and the construction is completed in advance, so that a production line is put into production early and benefits are generated early.

An apparatus and method for batch forming of composite T-stringers. The apparatus comprises a core mold platform (1) and a core mold assembly. The core mold assembly comprises a fixed core mold (21) and two movable core molds (22) arranged side by side on two sides of the fixed core mold (21), wherein the fixed core mold (21) comprises two first L-shaped cavities (211), which are formed side by side and are mirror images of each other; and each movable core mold (22) comprises a second L-shaped cavity (222) in communication with a first L-shaped cavity (211) adjacent thereto. When the movable core molds (22) are at an open-mold position, the fixed core mold (21) and the movable core molds (22) preform, by means of a hot-diaphragm preforming operation, L-shaped blanks from composite prepreg sheets placed therein; and when the movable core molds (22) are at a closed-mold position, legs of the L-shaped blanks in the two movable core molds (22) are respectively fitted to legs of the L-shaped blanks in the fixed core mold (21) that are adjacent thereto, thereby simultaneously forming two composite T-stringers.

The utility model discloses a steel frame standard weld joint structure which comprises a frame cross beam, a frame longitudinal beam is arranged on the front side of the frame cross beam, angle plates are arranged at the rear ends of the two sides of the frame longitudinal beam, and an inserting weld joint is arranged at the contact position of the frame cross beam and the frame longitudinal beam. Splicing welding seams are arranged at the contact positions of the frame longitudinal beams, the angle plates and the frame transverse beams, and first inserting openings are formed in the rear sides of the frame longitudinal beams. The first inserting openings and the second inserting openings are used in cooperation, the contact area of the frame transverse beams and the frame longitudinal beams is increased, the frame transverse beams and the frame longitudinal beams are welded to form inserting welding seams, and meanwhile under the positioning effect of the positioning assemblies, the angle plates are welded to the included angles of the frame transverse beams and the frame longitudinal beams to form splicing welding seams; therefore, the frame cross beams and the frame longitudinal beams are stably connected, and the purposes of accurate welding position, large welding area and high strength can be achieved.

The application discloses a kind of forming methods of composite curved surface structure, comprising: selecting characteristic edge as ridge line and establishing coordinate system;Determine engineering boundary and expand processing allowance to form manufacturing boundary;Carry out manufacturability analysis and expand manufacturing boundary to two-dimensional profile;Lay and cut composite material layer;Hot diaphragm preforming and hot press tank solidification are mechanically processed into shape.The application adopts different processing allowance expansion ways and expansion strategies according to the symmetry of structure.Avoid preforming wrinkle through manufacturability analysis based on ridge line;Ensure that layer and tooling correspond accurately through ridge line projection and positioning structure design;Reduce transfer error by using hot diaphragm preforming and hot press tank solidification process.The method is suitable for hyperbolic stringer and other complex components in the field of aerospace, improves production efficiency and material utilization, reduces forming defect rate, and realizes stable manufacturing of high-quality composite structure.

The invention discloses an underground excavation station primary support arch cover method large arch springing structure and a construction method thereof, and aims at solving the technical problems that arch springing stress is concentrated in an upper-soft lower-hard stratum and traditional support settlement is large, and technical breakthrough is achieved through innovative combination of a dynamic adjustable support system and an intelligent grouting process. In the aspect of the structure, the self-adjusting steel pipe pile comprises inward inclination bottom feet with the inward inclination angle of 1: 6-8, a hinged angle adjusting base, a self-adjusting steel pipe pile with the dynamic adjustment of + / -5 degrees, a 600 * 600 * 25 mm partial pressure steel plate, a 45-degree inclined grouting hole channel, a check valve and a bottom longitudinal beam, a pile-plate-beam three-in-one structure is formed, and an optical fiber sensor is arranged in the steel pipe pile to monitor surrounding rock deformation in real time; according to the construction method, three-stage intelligent grouting, 0.1-0.3 MPa low-pressure filling, 0.5-0.8 MPa high-pressure reinforcing and compensation grouting based on monitoring are adopted, concrete is sprayed in cooperation with the telescopic formwork, and installation of the water stop type feet-lock anchor pipe and the water swelling rubber strip are completed synchronously.

The invention relates to the technical field of coal mine soil slope reinforcement, and particularly discloses a combined protection system for enhancing slope stability and a construction method.The combined protection system comprises a coal mine soil slope, a slope protection lattice beam structure is arranged on the coal mine soil slope, a plurality of steel pipe piles are inserted into the slope top of the coal mine soil slope, and a top beam is arranged at the tops of the steel pipe piles; the slope protection lattice beam structure comprises a plurality of cross beams and a plurality of longitudinal beams, the cross beams and the longitudinal beams intersect to form a plurality of lattice lattices, vegetation layers are arranged in the lattice lattices, anchor rods are arranged at joints where the cross beams and the longitudinal beams intersect, and the anchor rods are arranged in a coal mine soil slope in a penetrating mode to fix the slope protection lattice beam structure. A capping beam is connected between the upper ends of the multiple cross beams, and a foundation beam is connected between the lower ends of the multiple cross beams. The slope protection lattice beam structure, the anchor rods and the steel pipe piles are arranged on the coal mine soil slope and can form a mutually-reinforced combined reinforcing effect, and the stability of the coal mine soil slope is ensured.

The application discloses a positioning method for solving the axis tolerance of a composite material work-shaped stringer reinforced co-bonding wallboard, which comprises the following steps: work-shaped stringer positioning, work-shaped stringer position degree checking, pressure pad placement and adaptation, pre-extraction, encapsulation and solidification forming and the like. The axis of the composite material work-shaped stringer reinforced co-bonding wallboard manufactured by the method is qualified; and the forming quality of the parts is improved, and the axis tolerance problem of the composite material work-shaped stringer reinforced co-bonding wallboard is solved in the most convenient way.

The invention relates to the technical field of accident oil pool structures, in particular to a passive automatic oil pool structure and a box-type substation, a box body of the passive automatic oil pool structure comprises a bottom plate, a bottom frame structure and a longitudinal beam structure, and an oil storage pool is defined by the bottom plate and the bottom frame structure; the multiple supporting longitudinal beams are fixedly connected with the bottom frame structure in the oil storage pool and arranged at intervals in the length direction of the bottom plate, and first gaps allowing liquid to flow are formed between the supporting longitudinal beams and the bottom plate. The oil storage pool of the passive automatic oil pool structure is integrated at the bottom of the box body and used for collecting leaked or overflowed accident oil, factory prefabrication can be achieved, earthwork construction does not need to be carried out on a project site, and the oil leakage situation can be rapidly found and troubleshooting treatment can be carried out during daily maintenance; the problems that an existing accident oil pool needs to design a drawing in advance and ask a professional team for construction, the construction period is long, the cost is high, and the problems that the oil leakage condition is difficult to observe and overhaul are solved.

The utility model relates to the technical field of sieve plates, in particular to a sieve plate for a vibrating screen, which comprises a mounting T-shaped iron, a longitudinal beam is movably connected to the upper surface of the mounting T-shaped iron, and the sieve plate is characterized in that a pair of first fixing bolts is rotatably connected to one side wall of the mounting T-shaped iron; a pair of T-shaped iron and cross beam mounting threaded holes is formed in the two sides of the upper surface of the mounting T-shaped iron, the upper surface of the longitudinal beam is movably connected with a polyurethane buffer base plate, the upper surface of the polyurethane buffer base plate is movably connected with a sieve plate body, and sieve holes are formed in the sieve plate body. The polyurethane buffer base plate is made of a rubber material, is used for reducing mechanical vibration and impact, can absorb and disperse mechanical stress and can prevent the sieve plate body from being scratched, abraded or damaged, so that the service life of the sieve plate is prolonged, the sieve plate is convenient to disassemble, and the cost is reduced. And therefore, a worker can maintain and replace the device conveniently.

The utility model discloses a mining excavator cab top bearing beam which comprises an excavator cab body, a supporting assembly is arranged between the excavator cab body and a top bearing longitudinal beam and between the excavator cab body and a top bearing cross beam, a crumple assembly is arranged in the supporting assembly, and the crumple assembly is fixedly connected with a first reinforcing piece. The top bearing longitudinal beam and the top bearing cross beam are fixedly connected through a first reinforcing piece, the connecting stability of the connecting position of the top bearing longitudinal beam and the top bearing cross beam is better, the connecting stability between the top bearing longitudinal beam and the supporting frame and the connecting stability between the top bearing cross beam and the supporting frame are better through a second reinforcing piece which is fixedly connected, and the supporting frame has the crumple energy absorption capacity by forming a plurality of second crumple through holes and third crumple through holes. And the formed first crumple through hole enables the supporting seat to have crumple energy absorption capacity, so that the situation that when the top bearing longitudinal beam and the top bearing cross beam are collided by rolling ores, the top of the excavator cab body is directly subjected to large impact force, and deformation damage is caused is avoided.

The utility model discloses a large-size cast-in-place concrete splicing formwork. The large-size cast-in-place concrete splicing formwork comprises a formwork body, a plurality of hanging rods and a plurality of sets of splicing assemblies. The plurality of hanging rods are vertically arranged and are fixed on the inner side plate surface of the template body at equal intervals; the lifting rod comprises a longitudinal beam and a lifting lug arranged on the top side of the longitudinal beam; the splicing assembly is composed of an outwards-convex connecting part, an inwards-concave connecting part and a fastening connecting piece. The outwards-convex connecting parts and the inwards-concave connecting parts of the multiple sets of splicing assemblies are arranged on the edges of the left side and the right side of the formwork body at intervals in a one-to-one correspondence mode and fixedly connected in an embedded fit mode. According to the formwork, the suspenders and the splicing assemblies are additionally arranged, so that the structural strength of the formwork and the bonding strength of the formwork and concrete are enhanced, and deformation during later concrete pouring is avoided; and meanwhile, rapid and gapless high-quality connection of the two formworks can be achieved through the splicing assembly, and the problem of grout leakage during later concrete pouring is effectively avoided.

The utility model provides a bearing top frame assembly of a container and the container. The bearing top frame assembly comprises a top longitudinal beam, an outer top frame, a pipeline installation component and an inner top frame. The outer top frame is at least partially arranged between the two adjacent top longitudinal beams, the outer top frame comprises supporting beams, the supporting beams are connected to the top longitudinal beams, and the supporting beams are used for supporting the radiator. The pipeline installation component is arranged on the outer top frame and / or the top longitudinal beam. The inner top frame is arranged between every two adjacent top longitudinal beams and is separated from the outer top frame in the height direction of the container. According to the load-bearing top frame assembly of the container, the outer top frame comprises the supporting beam, the supporting beam is connected to the top longitudinal beam, so that the load-bearing top frame assembly can bear the load and install the outer cooling radiator, the pipeline installation component can install and bear the inner pipeline and the outer pipeline, and therefore the load-bearing top frame assembly is suitable for integration and installation of a hydrogen production power source. In addition, a thermal insulation layer can be arranged through the arrangement of the inner top frame, so that the influence of external temperature on the interior of the box is reduced.

The application discloses a clamping device for welding a rocket storage tank cylinder section and a stringer, which comprises a first connecting rod, a second connecting rod, a third connecting rod and a pressing mechanism, wherein the first connecting rod is arranged on one side of the second connecting rod and parallel to the second connecting rod. The third connecting rod is arranged below the first connecting rod and the second connecting rod, and the two ends of the third connecting rod are detachably connected with the bottom end of the first connecting rod and the bottom end of the second connecting rod respectively. The top end of the first connecting rod is provided with the pressing mechanism, the top end of the second connecting rod is provided with a back plate, the pressing mechanism is arranged correspondingly with the back plate, and the pressing mechanism is used for pressing the stringer at the ring joint of the cylinder section. The application can avoid the radial inward shrinkage of the ring joint of the cylinder section during the welding process, ensure the smooth welding of the rocket storage tank and the stringer, avoid the use of spot welding equipment, and improve the overall production efficiency of the rocket storage tank.

The utility model discloses a water pump lifting and moving device for a fixed pump station in a long and large tunnel, and belongs to the technical field of tunnel construction. The device comprises two longitudinal beam rails, a cross beam rail, a movable hoisting machine and longitudinal beam rail fixing devices, the two longitudinal beam rails are arranged on the two sides of the upper portion of a fixed pump station in the longitudinal direction of a tunnel respectively, and the longitudinal beam rails are fixedly connected with a vault above the fixed pump station through the multiple longitudinal beam rail fixing devices arranged at intervals. The longitudinal beam track fixing device comprises an embedded steel plate embedded in vault second lining concrete and a triangular connecting piece fixedly connected to the outer side of the embedded steel plate, the longitudinal beam track is I-shaped steel, the upper end of the longitudinal beam track is fixedly connected with the triangular connecting piece through a bolt, the cross beam track is I-shaped steel, and the lower end of the cross beam track is fixedly connected with the triangular connecting piece through a bolt. The two ends of the cross beam track are movably matched with lower flanges of I-shaped steel of the longitudinal beam track through walking pulley mechanisms respectively, the movable hoisting machine is movably arranged on the cross beam track, and the two ends of the longitudinal beam track and the two ends of the cross beam track are each provided with a limiting buffering device.

The invention discloses a cover-excavation method steel cover plate and a connecting and limiting method thereof, and belongs to the technical field of foundation pit engineering. Aiming at the defects of large vibration, high noise, poor driving comfort, insufficient rigidity, low repeated utilization rate, improper connecting and limiting measures and the like of an existing cover-excavation method cover plate, a vertical support-horizontal support-steel cover plate integrated structure system is constructed, and vertical support is formed by constructing a foundation pit enclosure wall and a stand column pile; a first reinforced concrete support serves as a transverse horizontal support, a section steel longitudinal beam is erected to serve as a longitudinal horizontal support, reliable limiting between steel cover plates and between the plates and the beams is achieved by matching reserved holes and clamping grooves with bolts and clamping section steel, and the flatness and the vibration reduction effect are optimized with assistance of a rubber vibration reduction cushion layer. The steel cover plate adopts standardized H-shaped steel assembly welding and fiber concrete surface layer design, and can be repeatedly used. The problem of vibration noise of the cover plate under dense vehicle load is effectively solved, deformation of the foundation pit is controlled, interference of construction to the surrounding environment and traffic is reduced, the requirements of energy conservation and emission reduction are met, and remarkable environmental protection benefits and economic benefits are achieved.