174results about How to "Reasonable force" patented technology

The utility model relates to a floating type offshore wind power suction anchor foundation mooring lifting lug structure which comprises a suction anchor cylinder body, a main eye plate and a cylinder body thickening plate, the cylinder body thickening plate is fixed on the inner side wall of the suction anchor cylinder body, the main eye plate is fixed on the outer side surface of the suction anchor cylinder body, and the cylinder body thickening plate is fixed on the inner side wall of the suction anchor cylinder body. The main eye plate penetrates through the side wall of the suction anchor cylinder and the cylinder thickening plate and is fixedly connected with a first connecting plate, a second connecting plate is fixed to the other side of the first connecting plate, and the second connecting plate is fixed to the inner side wall of the other side of the suction anchor cylinder. According to the utility model, the suction anchor cylinder body can form a whole with a stable structure.

The utility model belongs to the field of building structures, and provides a rigid connection node of a square steel pipe column and a reinforced concrete column, which comprises an embedded steel plate, cross-shaped steel and a plurality of anchor bars, the cross-shaped steel and the anchor bars are both pre-buried in a reinforced concrete column, the pre-buried steel plate is fixedly arranged on the top of the reinforced concrete column, the cross-shaped steel and the anchor bars are both located below the pre-buried steel plate, and the top ends of the cross-shaped steel and the top ends of the anchor bars are both fixed to the pre-buried steel plate. And the embedded steel plate is fixed with the square steel pipe column. The rigid connection node can effectively solve the problem that when the size of the square steel pipe column on the upper portion is close to the size of the reinforced concrete column on the lower portion, a traditional embedded type or outer wrapping type method is not suitable, rigid connection between the square steel pipe column and the reinforced concrete column can be achieved, column bottom bending moment, axial force and shearing force of the square steel pipe column can be effectively transmitted, stress is reasonable, and the service life of the square steel pipe column is prolonged. Installation is convenient, and enough rigidity is achieved.

The invention relates to the technical field of automatic machining equipment, in particular to a bending method and a bending device.The bending method provides bending device.The bending device comprises a first bending unit and a second bending unit, the first bending unit is provided with a first bending part, and the second bending unit is provided with a second bending part; the method comprises the following steps: transferring a flexible structure to a first bending unit; the first bending part is driven to do jacking motion in the first direction to jack the first bending position of the flexible structure, so that the flexible structure forms a first bending structure at the first bending position; the flexible structure bent for the first time is transferred to a second bending unit; and the second bending part is driven to do translational motion in the second direction, so that the flexible structure is pushed to be close to the position of the second bending position, and the flexible structure forms a second bending structure at the second bending position. The invention mainly aims to provide a bending method and aims to realize secondary bending of a flexible structure.

The invention discloses a screw prestressing prefabricated radial beam slab type fan foundation and a construction method thereof. The screw prestressing prefabricated radial beam slab type fan foundation comprises a beam pier combined prefabricated part, an anchor disc, a horizontal anchor rod, a vertical anchor bolt, a connecting plate, an upper anchor plate and a lower anchor plate. The fan foundation is formed by annularly arranging and splicing a plurality of beam and pier combined prefabricated parts, a plurality of rows of horizontal reserved hole channels are formed in the step-variable beam plate, and horizontal anchor rods are anchored to a connecting anchor plate in the center of the foundation and the outer side of the foundation through the reserved hole channels to lock the foundation. And connecting plates are arranged between the variable-step beam plates, so that the consistency of the whole structure is improved. A vertical preformed hole is formed in the middle pier on the inner side of the step-variable beam plate, and fan tower tube anchor plate grooves are reserved in the upper surface and the lower surface of the middle pier, so that vertical anchor bolt installation is facilitated. The foundation is reasonable in form stress, and the collision problem between the horizontal anchor rods is avoided by adopting a connection anchor plate pulling mode; and grouting-free dry operation on a construction site can be achieved, installation is convenient, efficient and environmentally friendly, and the problem that the temperature of a core area is too high in the traditional fan foundation construction process is effectively solved.

The utility model provides a cutter grinding device of a cutting bed. The cutter grinding device comprises a cutter grinding sand column, a rotation driving member; a sliding part is connected to the sliding rail in a sliding mode, and the sliding part is connected with the rotary driving piece and the sharpening sand column; the buffering mechanism comprises a buffering shifting rod and a buffering seat plate connected with the sliding part, a guiding shaft and a buffering shaft which are parallel to each other are arranged in the buffering seat plate, and the buffering shaft is sleeved with a spring; a first open hole and a second open hole are formed in the buffer driving lever, and the first open hole is arranged on the guide shaft in a sleeving manner; the buffer shaft is sleeved with the second open hole. The buffer seat plate is further in threaded connection with an adjusting knob, one end of the spring abuts against the adjusting knob, and the other end of the spring abuts against the buffer deflector rod; and the output end of the linear displacement driving part is connected with the buffer shifting rod. The utility model further provides a cutting bed which comprises the cutter grinding device. The knife sharpener has the advantages that stable knife sharpening pressure is provided, and knife sharpening work data are more accurate.

The utility model discloses a steel-concrete composite beam cast-in-place bridge deck slab construction supporting system which comprises narrow steel box girders, wood secondary ridges and wood formworks and is characterized by further comprising lug plates welded on the inner sides of the tops of the narrow steel box girders and steel main ridges fixedly connected between the adjacent narrow steel box girders through the lug plates. The cantilever steel pipe, the left inclined supporting rod and the right inclined supporting rod are arranged on the bottom plate cantilever plate on the inner side of the narrow steel box girder; the upper ends of the left inclined supporting rod and the right inclined supporting rod are connected with the midspan position of the steel main ridge, and the lower ends of the left inclined supporting rod and the right inclined supporting rod are connected with the cantilever steel pipes on the adjacent narrow steel box girders respectively. The wood secondary ridges and the wood formworks are sequentially arranged on the steel main ridges from bottom to top. A novel structural design is adopted, stress is reasonable, materials are conventional, installation is convenient, the construction speed is high, the construction cost is low, and compared with a full-space supporting system, the economic performance, the safety, the progress and the quality are greatly improved.

The invention discloses a fabricated steel-ultra-high-performance concrete combined bridge deck structure with shear grooves and a construction method of the fabricated steel-ultra-high-performance concrete combined bridge deck structure, and relates to the technical field of bridge deck constructions.The bridge deck structure comprises a lower-layer steel bridge deck, an upper-layer prefabricated ultra-high-performance concrete bridge deck and shear connectors; the prefabricated ultra-high performance concrete bridge deck is provided with a shear groove, an embedded connecting piece penetrates through a groove opening of the shear groove in the transverse bridge direction, the two ends of the embedded connecting piece are embedded in the prefabricated ultra-high performance concrete bridge deck, the top of the shear connecting piece is fixed to the embedded connecting piece in a lap joint mode, and the bottom of the shear connecting piece is fixed to the steel bridge deck. A post-pouring layer is arranged between the prefabricated ultra-high performance concrete bridge deck and the steel bridge deck. The bridge deck slab is good in structural integrity, excellent in crack resistance and reasonable in stress, the interface connection problem of the prefabricated ultra-high-performance concrete bridge deck slab and the steel bridge deck slab can be effectively solved, the bearing capacity of a combined bridge deck system is improved, and the service life of the combined bridge deck system is prolonged.

The invention discloses an FRP thin-walled pole and a manufacturing method thereof. The FRP thin-walled pole comprises a pole body. The pole body is in the shape of a truncated cone or a regular prism that is gradually thickened from top to bottom and hollow inside. The wall thickness of the pole body gradually increases from top to bottom. The pole body is formed by winding multiple layers of FRP material. A top end cap of the pole body is arranged. The FRP thin-walled pole is prepared by a winding process. The pole is designed to be a hollow thin-walled structure with a wall thickness of 2-15 mm. The pole has simple stress distribution, small internal stress, high strength, an integrated structure and light weight. The pole has a simple construction process, is not easy to rust, has a long service life, and meets various requirements for power transmission.

The utility model discloses a high-capacity horizontal belt storage bin device for a continuous conveyor, which comprises a fixed roller support assembly, a moving roller support assembly and eighteen turnabout rollers with the same diameter, and the fixed roller support assembly and the moving roller support assembly are symmetrically arranged. The fixed roller support assembly and the moving roller support assembly are each provided with nine turnabout rollers, an isosceles triangle distribution structure is formed on the fixed roller support assembly and the moving roller support assembly, and a conveying belt enters the moving roller support assembly from the bottom of the fixed roller support assembly. And then the belt passes through a plurality of turnabout rollers on the moving roller bracket assembly and the fixed roller bracket assembly in sequence, and finally is wound out from the upper part of the fixed roller bracket assembly, so that ten layers of storage belts are formed. According to the scheme, the technical problems existing in an existing belt storage bin for the fast tunnel tunneling matched continuous conveyor can be effectively solved, and the reliability of the belt storage bin for the fast tunnel tunneling matched continuous conveyor is improved.

The utility model provides a scale unit curtain wall structure, which reduces the risk of the influence of uncontrollable factors such as quality, construction period, safety and the like in the prior art, and meanwhile, a frame structure for supporting a glass panel is reasonable in stress and has processing feasibility. The back frame system comprises a front upright post, an inclined upright post, an upper cross beam, a middle cross beam and a lower cross beam; the upper cross beam, the middle cross beam and the lower cross beam are sequentially arranged from top to bottom and are respectively fixed with the upright columns; the inclined stand columns are fixed to the front stand columns and the middle cross beam. The glass auxiliary frame system comprises an upper glass auxiliary frame, a middle glass auxiliary frame, a lower glass auxiliary frame and a side glass auxiliary frame; the upper glass auxiliary frame is fixedly connected with the upper cross beam, the lower glass auxiliary frame is fixedly connected with the lower cross beam, and the side glass auxiliary frame is fixedly connected with the upright post; one end of the middle glass auxiliary frame is fixedly connected with the inclined stand column, and the other end is fixedly connected with the side glass auxiliary frame; the aluminum plate system comprises a top aluminum plate, a middle aluminum plate, a bottom aluminum plate, a side aluminum plate and a back aluminum plate; the top aluminum plate is fixed on the upper cross beam and the upper glass auxiliary frame, the middle aluminum plate is fixed on the middle cross beam and the middle glass auxiliary frame, the bottom aluminum plate is fixed on the lower cross beam and the lower glass auxiliary frame, and the side aluminum plate is fixed on the front upright post and the side glass auxiliary frame; and the aluminum frame is fixed on the glass auxiliary frame system.

This invention discloses a method and system for optimizing the design of offshore wind turbine support structures based on a surrogate model. The method establishes the relationship between the design parameters of the support structures for offshore wind turbines of different capacities and the structural performance response of the optimized design based on the Kriging surrogate model. Simultaneously, it optimizes the tower and monopile foundations to find the lightest overall support structure design. This method avoids getting trapped in local optima during the optimization design of offshore wind turbine support structures, which would otherwise only result in finding the lightest tower or monopile design. Using the method and process of this invention, after load calculation, the tower and foundation structures are simultaneously checked and optimized, leading to a globally optimal design. This results in a stronger overall structure, more uniform stiffness distribution, and more rational stress distribution, ultimately achieving the lightest overall support structure weight. Optimization based on the surrogate model reduces the number of computer simulations required for structural analysis, improving optimization efficiency.

The utility model discloses a kind of foundation structure and wind turbine generator set of wind turbine generator set, it is related to wind power generation technical field, wherein, foundation structure includes first bearing platform, second bearing platform, multiple bored piles and multiple anchor rods, the top surface of first bearing platform is connected with the connecting cylinder for connecting the tower cylinder of wind turbine generator set;Second bearing platform is set below first bearing platform, the top surface of second bearing platform projects the bottom surface of first bearing platform and forms step surface, the vertical projection of the bottom surface of first bearing platform in second bearing platform forms core area, the edge of second bearing platform forms the expansion area surrounded in core area;Multiple bored piles are distributed in core area with interval, each bored pile extends downward from the bottom surface of second bearing platform, and bored pile is vertically arranged;Multiple anchor rods are distributed in expansion area with interval, and anchor rod extends downward from the bottom surface of second bearing platform and is arranged with inclination.The foundation structure has good bearing capacity and stability, can guarantee the safety and stability of wind turbine generator set in long-term operation process.

The utility model discloses a kind of two-stage planetary reduction module suitable for frameless motor, belong to robot movement field, to solve the problem of poor integration when existing frameless motor adapts reduction module, insufficient reduction capacity.The module includes motor, two-stage planetary reduction mechanism, motor shell, shell end cover and output flange;Motor contains coaxially arranged stator winding and motor rotor, and motor rotor is ladder shaft structure;Two-stage planetary reduction mechanism is composed of primary reduction unit and secondary reduction unit, primary sun gear is connected with motor rotor by first sun shaft, secondary sun gear is connected with primary planetary gear by first planet carrier, and output flange is connected with second planet shaft, and first gear ring is arranged on the inner wall of motor shell.The utility model does not need transition component, and integration is high, two-stage reduction can realize high transmission ratio, and transmission precision is high, support is stable, effectively improve equipment load capacity and operating reliability.

The invention discloses a welding-free modularized combined type bearing support suitable for a groove connection type vertical pipeline, which comprises a bearing short pipe, opposite clamping plates and a bearing base are arranged outside the bearing short pipe, a tongue-and-groove mortise is arranged in the middle of the bearing short pipe, the opposite clamping plates are in a two-piece spliced type, and the bearing base is arranged on the opposite clamping plates. Tongue-and-groove mortises are formed in the inner sides of the opposite clamping plates, tongue-and-groove mortises are formed in the inner sides of the opposite clamping plates, the tongue-and-groove mortises are inserted into the tongue-and-groove mortises, opposite clamping plate flange plates and opposite clamping plate steel rib plates are arranged outside the opposite clamping plates, and horizontal limiting parts and vertical limiting parts are arranged at the positions, corresponding to the opposite clamping plate flange plates and the opposite clamping plate steel rib plates, of the bearing base correspondingly. Compared with a conventional bearing support, the bearing support has the advantages of being free of welding, free of damage to an anti-corrosion zinc coating, reasonable in stress, safe, reliable, rapid to install and the like.

The utility model discloses a photovoltaic module junction box anti -loosening fixing device, including junction box, wherein the junction box inside middle position is equipped with the terminal, and the both ends of terminal are equipped with helical spring respectively, wherein helical spring below is equipped with sliding mechanism. The utility model discloses through setting terminal connection fixed wire in the junction box inside middle position, sets up helical spring respectively at the both ends of terminal, effectively reduces the possibility that wire loosens at the junction because of external force and pulls, has reduced the risk of wire drop, has guaranteed the stability of electric quantity delivery, through setting sliding mechanism below helical spring, when wire is subjected to wind power and so on external force and pulls, sliding mechanism drives helical spring telescopic, can effectively buffer the pulling strength of external force to wire, further avoids the loosening of wire and terminal junction because of excessive stress, has strengthened the stability and reliability of whole junction structure.

The application relates to the technical field of household appliances, in particular to a refrigerator comprising a cabinet, a cabinet inner container, a refrigeration pipeline, a fixing assembly, the cabinet inner container is provided with a mounting port, the fixing assembly comprises a fixing piece used for fixing the refrigeration pipeline and a screwing piece connected to the fixing piece, and the screwing piece is configured to rotate relative to the mounting port so as to fix the refrigeration pipeline to the cabinet inner container. The fixing assembly used for mounting the refrigeration pipeline is convenient to install and reliable in connection.

The utility model discloses a kind of high-strength framework structures of solid wood composite door, including door body, upper frame and lower frame are separately provided on door body, outer frame and inner frame are separately provided on the both sides of door body, rectangular tubular crosspiece is equipped in the middle of outer frame and inner frame, fixed block is equipped in the middle of crosspiece, threaded hole is vertically equipped in the middle of fixed block, main support rod is equipped in threaded hole, a plurality of I wheels are equipped on the main support rod of crosspiece up and down, vice support rod connection inner frame and outer frame are equipped on the both sides of I wheel.The utility model has the beneficial effects that: the high-strength framework structure of solid wood composite door of the utility model utilizes the design of advanced metal and wood combination, guarantees the appearance and firmness of door body, provides excellent compression resistance, corrosion resistance and deformation resistance performance;The utility model improves the strength and stability of door body in compression resistance, bending resistance, tensile resistance and other aspects by optimizing internal support frame, reasonably distributing stress, selecting high-strength material and strengthening connecting part.

The invention provides a temporary pier connecting device and a quick-release inserting-pulling type bridge temporary pier comprising the temporary pier connecting device, and belongs to the technical field of supporting devices. The present invention comprises: a first connecting steel plate; the second connecting steel plate is connected with the first connecting steel plate in an inserted mode, and a pin hole is formed in the second connecting steel plate; and the fixed pin shaft is driven by a driving device, penetrates through the first connecting steel plate and then is inserted into the pin hole. The temporary pier connecting device has the advantages of being safe, reliable, capable of being quickly disassembled, inserted and pulled, convenient and fast to operate and capable of being repeatedly used. When the temporary pier connecting device is used for quickly detaching the inserting and pulling type bridge temporary pier, mounting and detaching operation is easy and convenient, the structural stress performance is good, mounting and detaching are convenient and fast, and repeated use can be achieved. Only a small reserved space and manual operation are needed, the structure is simple, stress is reasonable, and the application range is wide.

The utility model discloses a sliding structure capable of running smoothly, which belongs to the technical field of automobile accessories and comprises a sliding groove, a sliding channel arranged along the length direction of the sliding groove is arranged in the sliding groove, a sliding seat and a screw rod for driving the sliding seat to translate along the sliding channel are arranged in the sliding channel, the top surface of the sliding seat is connected with a cantilever, and the cantilever is connected with the sliding groove. A guide rail is arranged on the inner wall of the sliding groove, a groove is formed in the sliding base, and the guide rail extends into the groove. According to the sliding structure which runs smoothly, the original large cylindrical sliding contact surface is changed into a small-area contact form that the sliding chute is matched with the sliding seat, so that the friction coefficient is greatly reduced.

The utility model relates to a kind of battery protection plate pressure maintaining mechanism, including locating seat, holding component and pressure maintaining component;The locating seat is equipped with the locating part for placing battery protection plate, the holding component and pressure maintaining component are oppositely arranged on the both sides of the locating part, the holding component is configured to abut and fix the battery protection plate from one side, the locating seat is equipped with the first pressure maintaining inclined plane in the side towards the pressure maintaining component, the pressure maintaining component is configured to be close to the locating part from the other side, to clamp the part to be pressure maintained of the battery protection plate between the first pressure maintaining inclined plane and the pressure maintaining component. The utility model can realize the effective positioning and pressure maintaining of product, avoid rebound, improve the quality and reliability of product.

The invention relates to the technical field of civil engineering, in particular to a steel sheet pile supporting device. The steel sheet pile supporting device comprises a pile plate body, an enclosing purlin assembly and a steel pipe support, and the pile plate body is fixedly connected with the enclosing purlin assembly through a hanging piece; the enclosing purlin assembly comprises a front plate, a rear plate and I-shaped steel, the front plate and the rear plate are connected through at least two sets of first bolts, and the length of the first bolts is larger than the distance between the front plate and the rear plate. The I-shaped steel is inserted between the front plate and the rear plate, and the number of the I-shaped steel is 2-3; the steel pipe support is a steel pipe, the steel pipe support is connected with the front plate, at least two sets of first stiffening ribs are arranged at the end of the side, close to the front plate, of the steel pipe support, and the steel pipe support is in threaded connection with the supporting piece through the first bolt holes. According to the supporting device, the assembling procedure is greatly simplified, the connection between the steel pipe support and the enclosing purlin assembly is firmer and more reliable, the load effect under the full working conditions of supporting tension, pressing and the like can be effectively resisted, and the overall stability and the bearing capacity of the supporting device are further improved.

The utility model relates to a kind of early-dismantling support structures of superimposed floor, belong to the field of construction engineering, it includes vertical support, horizontal support and formwork;The vertical support is set in the gap between adjacent superimposed board both sides and is supported below superimposed board, including lower column, upper column, adjusting nut, backing plate and early-dismantling head, lower column is connected by screw with upper column, adjusting nut is threadedly connected in the top of upper column, backing plate is installed in the top of adjusting nut, early-dismantling head is connected in the top of backing plate, upper column is connected with early-dismantling head and passes through backing plate;The horizontal support includes interval arrangement main ridge and variable cross section main ridge, both ends of main ridge and variable cross section main ridge are all overlapped in the top of backing plate, main ridge is used to support superimposed board, and variable cross section main ridge is used to place formwork.The utility model structure is good in integrity, stress is uniform, and it is convenient and fast to install and dismantle, quality safety is double controllable, with remarkable economic benefits and social benefits.

The invention relates to the technical field of granary ventilation and grain discharging, in particular to a multifunctional round bulk granary bottom assembly type full-ventilation grain discharging integrated device which is conical and comprises a top plate and a bottom plate connected with the top plate, and a consolidation structure and a full-ventilation system are arranged between the top plate and the bottom plate. The bin bottom is further provided with a discharging auxiliary structure in a matched mode. Wherein the top plate is of a frame structure, the minimum unit is a quadrilateral area defined by every two adjacent radial partition plates and circumferential beams, and a sieve pore plate is laid on the top plate and matched with the minimum unit of the top plate. The consolidation structure comprises radial partition plates and circumferential beams, the radial partition plates and the circumferential beams are arranged between the top plate and the bottom plate, the diameters of the circumferential beams are gradually increased from the center of the silo to the wall of the silo, and the circumferential beams and the radial partition plates are welded in a crossed mode to form a grid-shaped structure; the full ventilation system comprises radial partition plates arranged between the top plate and the bottom plate, circumferential beams and ventilation holes, a main air duct is arranged on the center cylinder, and during ventilation operation, air enters the ventilation holes through the main air duct and is dispersed to the position between every two adjacent radial partition plates, and finally enters the bin through the top plate to form the full ventilation system.

The invention discloses a head for an embroidery machine, comprising a head main shaft, a plurality of bearing seats, a balancing block, a cantilever body, a needle bar frame provided with a needle bar assembly, a presser foot assembly and a thread take-up rod assembly, a thread take-up rod transmission assembly, a needle bar transmission assembly and a presser foot transmission assembly. The head main shaft is arranged on the cantilever body through the bearing seat, a balancing block is arranged on the head main shaft, the front end of the cantilever body is provided with a needle bar frame through a slideway, the front end of the cantilever body is provided with a color-changing driving mechanism for driving the needle bar frame, the head main shaft drives the thread take-up rod transmission assembly, the needle bar transmission assembly and the presser foot transmission assembly. Compared with the prior art, vibration and noise can be reduced, the use is convenient, and the stability and work efficiency are improved.

The invention relates to the field of breeding manure fermentation turners, in particular to a livestock breeding manure fermentation turner which comprises a body, a walking mechanism, an adjusting mechanism and a turning mechanism, and the walking mechanism is connected to the body and drives the body to move; the turning mechanism is connected to the main body through the adjusting mechanism, and the adjusting mechanism is used for adjusting the turning angle of the turning machine. The main body comprises a truss and a support frame, and the support frame is fixedly connected with the truss; the walking mechanism is connected to the truss, and the adjusting mechanism is hinged to the supporting frame. The truss is trapezoidal, multiple sets of triangular reinforcing ribs are arranged on the front end face and the rear end face of the truss respectively, and limiting channels are formed in the left side and the right side of the truss respectively. The turning and throwing device not only can improve the working efficiency, but also can be suitable for turning and throwing various turned materials.

The utility model belongs to the technical field of material carrying, and relates to a wire coil clamp for a truss robot, which comprises a base, two claws arranged on the base in a sliding manner, and a driving mechanism for driving the two claws to move in the same direction or opposite directions so as to realize the grabbing or releasing action, the opposite sides of the two hook claws are provided with positioning pins and buffering pads, the positioning pins are matched with center holes in the left side and the right side of a wire coil, the driving mechanism comprises two air cylinder assemblies correspondingly connected with the two hook claws, and each air cylinder assembly comprises an air cylinder body and an electromagnetic valve used for driving the air cylinder body. A piston rod of the air cylinder body is connected with a hook claw through a floating connector, and the air cylinder body is further connected with an in-place sensor and a speed regulating valve. According to the utility model, the stability of materials in the operation process is improved, the safety of material carrying is improved, meanwhile, a higher operation speed is supported, and the device has the advantages of being compact in structure, stable, reliable, convenient, effective, efficient, safe and the like, and improving the material turnover efficiency.

The utility model relates to a large-span prestressed concrete continuous beam bridge full framing construction structure, which belongs to the technical field of bridge construction, and particularly comprises variable cross-section box beams arranged on two sides of the top of a full framing, a closure section arranged in the middle of the two variable cross-section box beams, and piers arranged at the end parts of the variable cross-section box beams. Reinforced concrete connecting blocks are arranged on box chamber side plates of the variable cross-section box girders, longitudinal prestressed steel beam connecting holes are reserved in the reinforced concrete connecting blocks, and longitudinal prestressed steel beams of the variable cross-section box girders are connected into the longitudinal prestressed steel beam connecting holes formed in the front. And the longitudinal prestressed steel beams of the last stage of variable cross-section box girder are anchored at the two ends of the closure section. The variable cross-section box girder structure is convenient to construct, simple and easy to implement, short in construction period and smooth in beam bottom line type.

The utility model discloses a two-way prestress weight reduction assembly type composite floor slab system. The two-way prestress weight reduction assembly type composite floor slab system comprises a pre-tensioning prestress prefabricated concrete bottom plate, weight reduction blocks, cast-in-place concrete ribs and post-tensioning prestress steel bars. Longitudinal prestressed load-bearing steel bars and transverse distribution steel bars are arranged in the pre-tensioned prestressed precast concrete bottom plate. A concrete reinforcing rib or a steel truss reinforcing rib or a steel and concrete combined structure reinforcing rib is arranged on the concrete bottom plate; the weight reducing blocks are laid on the pre-tensioned pre-stressed precast concrete bottom plate, and the weight reducing blocks are spaced by a certain distance. A plurality of pre-tensioned pre-stressed precast concrete bottom plates are assembled together, and concrete ribs are formed after the weight reducing blocks are cast in place. The prestressed steel bars are post-tensioned in the concrete ribs, and after the concrete reaches the strength, the steel bars are tensioned to form post-tensioned prestressing force to form bonded or unbonded prestressing force. According to the utility model, the bidirectional rigidity of the floor system is consistent, the bidirectional force transmission performance and the bidirectional anti-cracking effect are better, the integrity of the floor system is better, and more steel materials are saved.

This invention relates to the field of PCB manufacturing technology, specifically disclosing a PCB drilling method based on differentiated processing of the same hole diameter. The method includes the following steps: acquiring hole position information and integrating measured data from the board surface for condition prediction; assigning virtual tool diameter codes to different hole positions according to the evaluation results and coordinating manufacturability for high-risk hole positions; using codes to drive two-layer parameter decision-making, generating Pareto optimal parameters through multi-objective optimization; during processing, decoupling thermo-mechanical-vibration interaction errors in real time through a multi-source sensor fusion model and generating multi-dimensional compensation instructions; and finally, achieving self-learning directional fine-tuning and iterative closed-loop of processing parameters through the linkage analysis of online hole wall quality assessment and tool life prediction. This invention achieves comprehensive intelligent processing from inter-hole differentiated parameter matching to dynamic precision feedback control within the hole, significantly improving hole wall quality and processing efficiency while effectively reducing overall processing costs, and has good industrial promotion value.