858 results about "Dead weight" patented technology

The invention discloses a high and large formwork engineering supporting system construction method, and belongs to the technical field of building engineering. Comprising the following steps: step 1, arranging intelligent nodes in a high and large template support system to realize information sharing and group cooperative regulation and control among the nodes; step 2, dividing the support system into a plurality of mutually associated load control areas, and setting differentiated load control parameters; step 3, automatically optimizing a pouring path; 4, when the concrete strength reaches a preset threshold value, the supporting rigidity or the reserved deformation amount is automatically adjusted according to a preset program, and the concrete structure bears the dead weight step by step; 5, the temporary load is automatically compensated, when the load exceeds a safety threshold value, a load redistribution mechanism and a reinforcing device are triggered, meanwhile, an alarm is started, and abnormal data are pushed; and step 6, continuously optimizing control parameters, accumulating construction data, constructing a digital construction record and a knowledge base, and realizing intelligent iterative upgrading of the construction method.

The invention discloses an electromagnetically-supported hybrid magnetic thrust bearing structure and a suspension force design method, and provides a hybrid magnetic bearing structure design in which radial alternate magnetization is adopted in the axial direction, a permanent magnet bearing formed by stacking multiple layers of magnetic rings bears all axial thrust loads, and radial electromagnetic bearings are assisted at the two ends to maintain dynamic stability of a rotor. The performance requirements of high bearing capacity, low power consumption, good active control capability and high dynamic stability of the hybrid magnetic thrust bearing in a limited space are met; in order to solve the problems that an inner magnetic ring and an outer magnetic ring are not strictly centered due to the influence of machining precision, an assembly process, rotor eccentricity and the like during actual operation of a permanent magnet thrust bearing, additional unbalance load, dynamic unbalance load and the like are generated in the radial direction. The electromagnetic supporting suspension force design method comprehensively considers the radial unbalance load of the permanent magnet thrust bearing, the dynamic unbalance load of the rotor and the self-weight influence, effective calculation of the suspension force of the supporting rotor is achieved, and important technical support is provided for the hybrid magnetic thrust bearing structure and suspension force design iteration.

The utility model discloses a duckbilled 220kv quick suspension grounding wire device, which relates to the technical field of grounding wire devices and comprises an insulating rod, an operating rod connected with the insulating rod, a screw rod connected with a clamping block, an arc-shaped block fixedly provided with a special-shaped rod and a connecting rod, a clamping block fixedly provided with a stop lever, a tongue-shaped rod connected with a first spring and a movable block, and an inserting rod inserted with an inserting groove. A spring II is fixed on the connecting block; the insulating rod is held by a hand, the cable is attached to the special-shaped rod through the special-shaped rod, the cable makes contact with the arc-shaped face of the tongue-shaped rod, the insulating rod is moved, the tongue-shaped rod moves downwards, the cable penetrates through the tongue-shaped rod, the tongue-shaped rod returns to the original position, the rotating disc is rotated to enable the arc-shaped block to clamp the cable, the arc-shaped block drives the special-shaped rod to press the tongue-shaped rod downwards, the inserting groove and the inserting rod are connected, and hanging of the grounding wire device is completed. The problem that a wire clamp of a grounding wire is not easy to hang due to a small opening is solved, the situation that the clamping effect is improved by increasing the dead weight of an insulating rod is avoided, and the burden caused by the insulating rod is reduced.

The invention belongs to the field of electric vertical take-off and landing aircrafts, and discloses a novel vertical take-off and landing remote high-speed manned electric tilt-rotor aircraft structure which comprises an aircraft body, wings, a V-shaped empennage, six supporting arms, six tilt-rotor units, an energy system, an avionics system and an undercarriage. The six tilting rotor wing units are symmetrically installed on the wings and the V-shaped empennage through the six supporting arms. The aircraft is mainly characterized in that the design of six tilting rotor units is adopted, so that the aircraft has the advantages of vertical take-off and landing, high-speed forward flight, no structural'dead weight 'and useless power consumption; the design that the supporting arms extend out of the wings and the empennage to exceed the radius length of the rotors is adopted, and the downward projection of a rotor disc is not overlapped with the wings and the empennage in the vertical flight state, so that downward washing flow of the rotors cannot generate downward loads on the wings and the empennage, and power consumption for overcoming the downward loads is avoided; the design of the wings with high aspect ratio and winglets is adopted, so that the forward flying lift-drag ratio and the cruising efficiency are improved, and the aircraft has high-speed forward flying and remote flying capabilities; and the six tilting rotor units adopt the same tilting mechanism, so that the complexity of design and manufacturing is reduced.

The invention discloses a method for calculating stress and deformation of a roller carrier supporting thin-walled cylinder under the action of dead weight, which comprises the following specific steps of: S1, calculating the bending moment and deflection of a cylinder body in the longitudinal direction by adopting an overhanging beam model in the longitudinal direction, and determining the optimal position of the roller carrier in the longitudinal direction according to the maximum bending moment minimization and the maximum deflection minimization of a beam; s2, transversely utilizing symmetry to establish a semicircular curved beam model, and calculating bending moment and displacement in a transverse plane of the cylinder by adopting a Temosinke beam theory; s3, calculating the maximum stress in the cylindrical surface according to the in-surface bending moment, and determining the optimal half wrap angle required by the strength; and S4, calculating the ovality and root-mean-square roundness of the curved beam according to the displacement, and determining the optimal half wrap angle required by deformation. According to the method, the maximum stress and the deformation shape of the thin-walled cylinder are accurately predicted, and the optimal wrap angles of the roller carrier under the strength requirement and the deformation requirement can be determined to be 67.4 degrees and 90 degrees respectively, so that the optimal wrap angle is suggested to be between 67.4 degrees and 90 degrees in engineering.

A positioning device for H-shaped steel cutting machining comprises a supporting piece, a positioning piece and a positioning piece, a through containing groove is formed in the supporting piece, and the supporting piece is used for containing H-shaped steel and making the H-shaped steel in a suspended state; the two sets of positioning pieces are symmetrically arranged on the left side and the right side of the first end opening penetrating through the containing groove, located in the thickness direction of a web of the H-shaped steel and used for conducting preliminary extrusion positioning on the web of the H-shaped steel; the two sets of fixing pieces are symmetrically arranged on the upper side and the lower side of a first port penetrating through the containing groove, located in the height direction of a web of the H-shaped steel and used for being matched with the thickness of the web of the H-shaped steel and fixing the H-shaped steel in a suspended mode; and the two sets of guiding pieces are symmetrically arranged on the left side and the right side of the second end opening penetrating through the containing groove, located in the thickness direction of a web of the H-shaped steel and used for conducting suspension guiding on the H-shaped steel by abutting against the two sides of the web of the H-shaped steel. The device mainly can reinforce suspended H-shaped steel, the clamping stability of the H-shaped steel is guaranteed, and the probability that due to the fact that deviation is likely to happen under the influence of the dead weight of steel, a notch inclines or the size is out of tolerance is effectively reduced.

The utility model provides a bridge abutment back roadbed structure which comprises a first graded broken stone hardcore, a first earthwork standard room, a first bidirectional geogrid, a foam light soil layer group, a second bidirectional geogrid, a second graded broken stone hardcore, a second earthwork standard room and a concrete layer group, the first graded broken stone hardcore, the first two-way geogrid, the foam light soil layer group, the second two-way geogrid, the second graded broken stone hardcore and the concrete layer group are sequentially arranged from bottom to top, the first geocell is arranged in the first graded broken stone hardcore, and the second geocell is arranged in the second graded broken stone hardcore. And the second geocell is arranged in the second graded broken stone hardcore. According to the abutment back roadbed structure, the settlement characteristic of the roadbed is improved, the overall stability and the bearing capacity of the roadbed are improved, and the dead weight of the roadbed can be effectively reduced, so that post-construction settlement at the bridge joint is reduced, the stability and the bearing capacity of the roadbed are improved, and the safety and the comfort of driving are ensured.

The utility model relates to the technical field of riprap fixing equipment, in particular to a riprap fixing device which comprises a riprap frame and a stretching net bag, the stretching net bag is arranged at the bottom of the riprap frame, the riprap frame and the stretching net bag are of a trapezoidal cage-shaped structure, the riprap frame is of a hollow structure, and a riprap opening is formed in the riprap frame. The stretching net bag is used for wrapping the submarine cable, and based on the principle of a riprap protection method, stone blocks are placed around the suspended submarine cable to fill the space, and a proper shape is built to protect the submarine cable; the device is filled with stones, the lower stretching net bag wraps the submarine cable under the action of gravity, and the suspended submarine cable is tightly surrounded by the device and the stones, so that the suspended submarine cable does not move any more, loss is reduced, the phenomenon that the suspended submarine cable is flushed down by water flow is avoided, and the dead weight and the structure of the device can ensure that the device is fixed in ocean current for a long time; and protection can be carried out for a long time, and the cost and the subsequent maintenance cost are saved.

The utility model provides an active dynamic balancing device based on a tower crane. The active dynamic balancing device comprises a tower body, a working arm and a balancing arm, wherein the working arm and the balancing arm are fixedly mounted on two sides of the top of the tower body respectively; a water storage tank and a balance water tank are fixedly mounted on the balance arm, and the bottom of the water storage tank is communicated with the balance water tank through a connecting pipeline; and a control valve group for controlling water distribution between the water storage tank and the balance water tank is arranged on the connecting pipeline. According to the utility model, the balance weight of the balance arm is designed into the capacity-adjustable water tank, the working moment is balanced by utilizing the moment generated by the dead weight of the water body, the volume of the balanced water body is adjusted in real time according to requirements, so that the moment is changed, and the quantity of the water body distributed in the water storage tank and the balanced water tank is adjusted in real time according to the working moment. And the balance moment is synchronously equal to the working moment in real time.

The invention relates to a pressing device, crimping equipment and a control method, the pressing device comprises a fixed seat, a pressing head structure, a pressing driver and a lifting driver, and the pressing head structure is movably arranged on the fixed seat; the press-fit driver is arranged on the fixed seat and connected with the pressure head structure so as to drive the pressure head structure to perform press-fit motion; the lifting driver is arranged on the fixed seat, the lifting driver is connected with the pressing head structure, and when the pressing device is in a working state, the lifting driver is used for lifting the pressing head structure in the direction opposite to the gravity direction so as to balance the dead weight of the pressing head structure. The lifting driver can lift the pressure head structure and balance the dead weight of the pressure head structure. Therefore, when the pressing driver drives the pressing head structure to perform pressing motion, the weight load of the pressing head structure does not need to be considered, so that higher-precision position control can be achieved when the pressing driver drives the pressing head structure to move, and higher-precision pressure can be output when the pressing device performs pressing operation so as to meet the pressing requirement.

The invention discloses a split type suction pile anchoring foundation and an offshore construction method, and relates to the technical field of ocean engineering, and the split type suction pile anchoring foundation comprises a suction pile structure and a buoyancy tank structure; an apron board structure and a lug plate structure are arranged on the side wall of the suction pile structure; a drainage pipeline penetrates through the top of the suction pile structure and communicates with the interior of the suction pile structure and the water suction pump. A balance weight cabin and a ballast tank are arranged in the buoyancy tank structure, and a pressure discharging and loading system is arranged in the ballast tank; the supporting leg structures are arranged at the bottom of the buoyancy tank structure, and the buoyancy tank structure is pressed on the apron board structure through the supporting leg structures; a first eye plate connected with a mooring rope or a mooring chain is arranged on the outer side wall of the buoyancy tank structure. The technical problems that due to the fact that a traditional suction pile anchoring foundation is limited by the dead weight, the depth of penetrating into soil in the soil conditions such as sandy soil is insufficient, enough pressure difference cannot be generated in the closed space formed by the cylinder wall and soil in the space outside the cylinder wall, and the suction barrel reaches the preset installation depth and the designed tensile strength and the designed pulling strength are solved.

The invention discloses a machine tool straightness error calculation method and system based on linear guide rail deformation, and relates to the technical field of machine tool straightness precision and straightness error evaluation. The method comprises the following steps: acquiring machining parameters of a linear guide rail and a lathe bed mounting surface in a machine tool mounting process; determining the contact point position of the linear guide rail and the mounting surface of the lathe bed and the normal bearing force by combining the stress balance condition of the linear guide rail; calculating the linear guide rail deformation amount caused by the dead weight of the linear guide rail, the bolt pre-tightening force and the normal supporting force; calculating a deviation value of the linear guide rail reference surface; and calculating the actual straightness of the linear feed shaft based on the relationship between the deformation of the linear guide rail and the straightness. According to the method, the calculation process better conforms to actual assembly of the linear guide rail, and the problems of idealization, limitation and the like in an existing mathematical model can be solved.

The invention relates to the technical field of cable installation equipment, in particular to cable installation equipment for building electrical construction, which comprises a shell, the shell comprises a shell body with a bottom opening and a binding cover for closing the opening, the binding cover is hinged to one end of the shell body, and the other end of the shell body is detachably connected through a lock catch mechanism. A bearing mechanism used for supporting a cable is arranged in the shell, the bearing mechanism comprises a first supporting rod and a second supporting rod which are rotationally connected to the opposite inner walls of the shell and located on the same straight line, the rotation range of the first supporting rod and the second supporting rod is only limited to upward overturning and resetting from the horizontal state, and the shell is suspended through a hanging mechanism. When the cable needs to be maintained, a target cable is directly moved upwards from the lower portions of the first supporting rod and the second supporting rod, the cable enters the shell, the first supporting rod and the second supporting rod are reset and closed under the dead weight, then the binding cover is closed, and when the cable needs to be maintained, the binding cover is directly opened, and the internal cable is overhauled; and thus, the convenience of cable installation and maintenance is improved.

The invention belongs to the field of light-weight foaming process refrigerated meat hook carriages, and particularly relates to a light-weight foaming process refrigerated meat hook carriage structure and a manufacturing process thereof. The refrigerated meat hook carriage structure is composed of a bottom plate, side plates, a top plate, a front plate and a door plate; the high-strength steel roll-in reinforcing ribs of suspension structures are arranged in the left side plate, the right side plate and the front plate, and continuous punched holes are designed in the high-strength steel roll-in reinforcing ribs to reduce the weight of the high-strength steel roll-in reinforcing ribs. The I-shaped high-strength steel cross beams are arranged in the top plate of the compartment body to replace a traditional full-channel steel frame structure, so that the dead weight of the novel process refrigeration meat hook compartment is 25% lighter than that of a side plate of a traditional process meat hook vehicle. The self-weight of the new-process refrigerated hook carriage is equivalent to that of a common refrigerated truck in the traditional process, the logistics transportation universality and the operation capacity of the new-process refrigerated truck are greatly improved, and the outer side of the high-strength I-shaped steel is filled with the polyurethane foaming broken cold bridge layer, so that the heat preservation effect of the carriage body plate is ensured.

The invention discloses a tractor chassis forging and drawing device and relates to the technical field of high-horsepower tractor production, the tractor chassis forging and drawing device comprises a machine base and a supporting assembly, a mold is arranged at one end of the top of the machine base, a chain conveyor is arranged in the machine base, a moving trolley is connected to the top of the machine base, and a clamp is arranged at the top of the moving trolley; the supporting assembly is connected to one side of the moving trolley and comprises a driving plate. Automatic lifting of the supporting mechanism is achieved through magnetic attraction linkage, when the moving trolley is away from the mold, a magnet drives a sliding block to drive a guide base to move, a sliding column ascends to a transverse groove along an inclined groove to be locked, a supporting rod pushes a pulley to make contact with the bottom of a bar to form supporting, and a suspended section between a mold outlet and a clamping point is effectively eliminated through the design; and stress field deviation caused by bending moment generated by the dead weight of the bar is avoided, the pulley structure provides stable bearing and can reduce surface scratches, and the drawing process quality is remarkably improved.

The invention belongs to the technical field of concrete beam column structures, and particularly relates to a beam column structure locally internally provided with thin-wall steel pipes and a mounting method of the beam column structure. By reasonably arranging the internally-arranged steel pipes and the reinforcing steel bars, the effects of reducing the dead weight of the structure and improving the bearing capacity are achieved. Due to the application of the steel pipe, the bending resistance and the shearing resistance of the concrete member are enhanced, and generation and expansion of cracks are effectively delayed. In addition, as the steel pipe has high strength and rigidity, the structure can still keep stable under the condition of high load, and is particularly suitable for occasions needing high bearing capacity, such as bridges and buildings. The stress characteristics of beam column components are fully considered, and a novel design method for internally-arranged steel pipe concrete is provided. Through detailed analysis of construction details and working principles, professional technicians can implement the method according to description, so that the safety and economical efficiency of an engineering structure are effectively improved. The shear resistance, the bending resistance and the overall stability of the structure are improved.

The application relates to a device and method suitable for precise positioning of steel pull rods of arch feet of steel truss arch bridges, the device comprising a first positioning steel plate and a second positioning steel plate, the length of the steel pull rod in the concrete arch support foundation being L, L being divided into n sections, the first positioning steel plate being arranged at a starting point node, the second positioning steel plate being arranged at intermediate nodes, and a lower bearing plate being arranged at an end point node, a plurality of through holes being arranged on the first positioning steel plate and the second positioning steel plate, the through holes being used for the steel pull rod to pass through, the positions of the first positioning steel plate and the second positioning steel plate being fixed through four coordinates, steel frame structures being arranged between the first positioning steel plate and the second positioning steel plate, adjacent second positioning steel plates, the second positioning steel plates and the lower bearing plate, and the steel frame structures being welded with the first positioning steel plate and the second positioning steel plate. The application can position the steel pull rod, avoid the steel pull rod from being deflected under the dead weight or being deformed under the impact of concrete pouring, and ensure that the long steel pull rod is perpendicular to the upper and lower bearing plates during construction.

The invention provides a loading mechanism for free combination of weight sets and a dead weight machine, the loading mechanism comprises a plurality of weight sets with different weight specifications and a weight loading and unloading assembly with rotating and lifting functions, the weight sets are placed at the top of the weight loading and unloading assembly, each weight set comprises a plurality of weight bodies, and the weight bodies are arranged on the weight loading and unloading assembly. The top end of each weight body is provided with a connecting disc, the connecting disc is connected with a hanging connector corresponding to the arc-shaped hanging groove, each weight body is provided with an arc-shaped hanging groove, and the arc-shaped hanging groove penetrates through the weight body along the radial direction of the weight body, so that the hanging connector can enter and exit from the arc-shaped hanging groove. Through mutual cooperation of rotation and lifting of the weight loading and unloading assembly, weight bodies on different weight sets are hung on the weight connecting mechanism at the same time, free selection of weights is achieved, combination of the weights is more diversified, and the dead weight machine can be matched with all calibration data in a force value calibration interval.

The utility model discloses a safety protective fence for building construction. The fence has the advantages that when the fence is used, after the two stand columns are fixed, only the inserting blocks on the two sides of the fence plate need to be placed in the inserting plates, the inserting plates can move downwards under the self-weight effect of the fence plate, and when the inserting plates move downwards, the pressing plates can be driven to move downwards by means of the sliding strips and the connecting columns; when the pressing plate moves downwards, the wedge-shaped block on the linkage plate is inserted into the wedge-shaped groove in the inserting block through the groove by means of the connecting rod so as to limit the enclosure plate, and when the enclosure plate needs to be disassembled, the enclosure plate only needs to be lifted to enable the wedge-shaped block to be separated from the wedge-shaped groove, so that the enclosure plate can be conveniently disassembled. Limiting of the enclosure plate is achieved through the dead weight of the enclosure plate, the tedious operation of manually screwing bolts for limiting is omitted, and therefore the installation efficiency of the enclosure plate is higher, and the construction progress cannot be delayed.

The invention relates to a truss-rib-free laminated slab and a string truss supporting device thereof, and belongs to the technical field of building structure engineering.The laminated slab comprises a prefabricated bottom plate, Y-shaped shear keys, concrete ribbed beams and ribbed bolt sleeves, traditional truss steel bars are omitted, innovative construction of the Y-shaped shear keys and the ribbed bolt sleeves is adopted, the steel consumption is remarkably reduced, and the cost is reduced. And meanwhile, pre-arching control over the prefabricated bottom plate is achieved through the string truss supporting device, and the construction efficiency and the environmental protection performance are improved. The device is designed to be three-point supporting or four-point supporting according to the span of the prefabricated bottom plate, is rapidly assembled through bolts and can be repeatedly used, and the construction cost is reduced. On the premise that the bearing performance of the structure is guaranteed, steel is saved by about 20%, the dead weight of the structure is reduced, the construction efficiency is improved, and green construction and sustainable development are achieved.

The invention relates to the technical field of hydrological monitoring, and discloses a hydrological information observation and monitoring unmanned ship which comprises a ship body, a multi-parameter water quality instrument and a cabin formed in the top of the ship body, a mounting frame is fixedly mounted on the top surface of the ship body, and a laser radar and a monitoring camera are mounted at the top of the mounting frame through bolts; according to the hydrological information observation and monitoring unmanned ship, the immersion depth can be increased by increasing the self weight in the using process, the stability of the ship body is improved, the supporting face between the ship body and the water surface is enlarged in the self weight increasing process of the ship body, and the stability of the ship body is further improved; therefore, stable and effective hydrological monitoring is guaranteed, the accuracy of hydrological monitoring data is improved, and when transfer is needed, the increased dead weight and the enlarged supporting surface are reduced, so that the advancing resistance of the ship body is reduced, the advancing maneuverability of the ship body is improved, and the working efficiency of hydrological monitoring is improved. Effective coordination of stability and maneuverability of the unmanned ship is realized.

The invention belongs to the technical field of bridge engineering earthquake resistance, and particularly relates to a bridge bidirectional self-resetting earthquake-resistant device and method with a multistage earthquake-resistant function, the bridge bidirectional self-resetting earthquake-resistant device comprises an upper sliding cover plate and a lower fixing base, the upper sliding cover plate is provided with a convex block, the lower fixing base is provided with a groove, and the convex block is in sliding connection with the groove; when the support is normally used and the earthquake force is smaller than the elastic deformation force of the plate-type rubber support, the support is normally used through the shape of the plate-type rubber support, and when the earthquake force is larger than the elastic deformation force of the plate-type rubber support, the upper sliding cover plate and the lower fixing base slide relatively. When the earthquake force is continuously increased, the inclination angle formed by the protruding block of the upper sliding cover plate and the groove of the lower fixing base is used for resisting the earthquake force, and self-resetting of the main beam is achieved through the self-weight effect. A support sliding shock insulation mechanism is fully utilized, serious damage to bridge piers after an earthquake is avoided, meanwhile, residual displacement of the bridge after longitudinal and transverse earthquakes is reduced, beam falling is avoided, and the shock resistance toughness of the bridge under a large earthquake is improved.

The invention relates to a double-column double-layer double-overhanging assembly type elevated station structure and a combination method thereof.The elevated station structure comprises two pier columns, a station hall layer overhanging cover beam, two stand columns, a platform plate lower layer overhanging cover beam, platform layer pier columns and platform prefabricated beams; the two station hall layer cantilever cover beams which are in mirror image with each other are connected through a first node and are supported on the pier columns; the stand columns are aligned with the pier columns and supported on a cantilever cover beam of a station hall layer. The two platform plate lower-layer overhanging cover beams which are in mirror image with each other are connected through a second node and are supported on the stand columns; the platform layer pier columns are supported on the platform plate lower layer overhanging cover beam. The platform prefabricated beam is supported on the platform layer pier columns, and the burden of the overhanging cover beam of the station hall layer is reduced in a double-layer overhanging mode. The problems that an existing elevated station structure is poor in safety redundancy, large in component dead weight and poor in maintainability are solved.

The invention relates to the technical field of metal plastic forming, and provides a precision control system and method for bending forming of a long cylinder section wall plate of a storage box. The electric feeding table is arranged on the front side of the numerical control bending press; the follow-up material supporting device is arranged on the rear side of the numerical control bending machine and can support the bent arc section of the wallboard; and the machine vision camera is arranged on the side surface of the numerical control bending press and is matched with the control device to carry out online detection. Automatic feeding can be accurately controlled in the long cylinder section wallboard bending forming process, the follow-up material supporting device can adjust the position of an electric swing supporting arm and the angle of a swing arm at any time, the influence of the dead weight of a bent arc section wallboard on the forming curvature is counteracted, online detection is conducted on the curvature of an area inner wallboard through the machine vision technology, and the forming accuracy is improved. The bending forming precision of the long cylinder section wall plate of the storage box is greatly improved, and the detection efficiency is greatly improved.

The invention belongs to the field of building prefabricated slabs, and particularly relates to a light-weight prefabricated laminated slab which comprises an inverted-T-shaped concrete prefabricated slab formed by pouring aerated concrete. Truss rib mechanisms are arranged in the concrete prefabricated slabs, the multiple concrete prefabricated slabs are tightly attached to form a prefabricated base, reinforcement cage parts are longitudinally arranged at the concave positions between the adjacent concrete prefabricated slabs on the prefabricated base, and triangular cone parts are arranged in all triangular rib structures located at the same transverse position on the prefabricated base in a penetrating mode. The triangular cone parts synchronously penetrate through the middle parts of all the reinforcement cage parts at the same transverse position; aerated concrete is adopted as a main body material of the prefabricated slab, the dead weight of the floor slab is remarkably reduced, and meanwhile the concrete consumption is reduced through the inverted-T-shaped structural design; the composite structure of the truss rib mechanism, the reinforcement cage part and the triangular cone part optimizes the use amount of reinforcing steel bars on the premise of ensuring the strength, so that materials are saved.

The invention discloses a chain type filler mounting device for sewage treatment equipment, and relates to a filler mounting device for sewage treatment equipment. The invention aims to solve the technical problems that in the current sewage treatment process, large-scale machinery is needed and a lot of manpower is consumed in biological filler installation and replacement. The moving plate can move left and right, target filler is accurately selected, and mounting and dismounting of a single row of filler are completed; the counterweight can counteract the dead weight of the filler, reduce the resistance of the rotating shaft and the rotating handle, and facilitate the operation of workers; the device is simple and compact in structure, can be adjusted according to the sizes and shapes of different biochemical pools, and is suitable for sewage treatment plants of various scales; the key components of the device are all made of corrosion-resistant materials and are convenient to disassemble and clean in design, and the difficulty and cost of daily maintenance are greatly reduced; through reasonable design, the device is stable in operation, can work for a long time without faults, and ensures the continuity and safety of the sewage treatment process.

According to the field welding-free fabricated composite structure bridge and the construction method thereof, the steel top plate-profile steel-inverted-V-shaped shear key UHPC composite bridge deck is adopted to replace a concrete bridge deck, and the corrugated steel web structures and the end connecting assemblies are matched to achieve segment welding-free connection; the problems that a prefabricated concrete bridge deck is large in dead weight and prone to cracking are solved, the defects that an all-steel bridge deck is fatigued and stiffening ribs are too many are overcome, and light weight and high performance of the structure are achieved. The transversely-arranged profile steel and the bridge deck structure are cooperatively stressed, and the overall rigidity of the bridge deck slab and the bearing capacity of the cantilever end are remarkably improved. Permanent and temporary combined three-stage connection is adopted for construction, integral hoisting of the whole span is achieved, and temporary piers can be omitted; the bridge deck slab joints are arranged in a staggered manner by adopting sawtooth grooves matched with longitudinal steel bars with end plates, stress transfer is realized by virtue of grouting materials, and joint transverse steel bars are omitted; the fulcrum area avoids concrete pouring in the hogging moment area through quick welding-free splicing of the fulcrum hoisting section, and the construction procedure is simplified.

The invention relates to the technical field of sealant packaging equipment, in particular to an automatic sealant production line which comprises a bag sealing mechanism. The bag sealing mechanism comprises a frame body, an unwinding assembly is arranged at the top of the frame body and comprises a shear fork arm assembly and a driving motor, carrier rollers are symmetrically installed at the two ends of the top of the shear fork arm assembly, and an auxiliary synchronous belt wheel is fixed to one end of one carrier roller; a third rotating shaft is arranged at the intersection point position of the shear fork arm assembly, one end of the third rotating shaft is fixedly connected with the output end of the driving motor through a coupler, and a main synchronous belt wheel in driving connection with the auxiliary synchronous belt wheel is fixed to the other end of the third rotating shaft; a first rotating shaft in sliding fit with the upper side plates on the two sides is arranged at one end of the bottom of the shear-fork arm assembly, and a second rotating shaft is arranged at the other end of the bottom of the shear-fork arm assembly and rotationally connected with the upper side plates on the two sides. The distance between the carrier rollers changes synchronously in real time along with the dead weight of the film roll and is matched with the dead weight of the film roll all the time, and dynamic and accurate adaptation in the full-unwinding process is achieved.

The invention discloses a construction method for repairing a concrete bridge deck through PVC pipes and a bridge deck structure thereof.The construction method for repairing the concrete bridge deck through the PVC pipes comprises the steps of early-stage calculation, broken bridge deck chiseling away, PVC pipe laying, concrete pouring and the like, and on the premise that it is guaranteed that the overall load of the bridge deck after maintenance and reinforcement meets the design requirement of an original bridge, the overall load of the bridge deck is reduced; the construction period is shortened and the construction cost is reduced while bridge deck maintenance and reinforcement are realized. A bridge deck structure repaired through PVC pipes comprises an original bridge deck pavement retaining layer and a concrete overlay layer, and the dead weight of a newly-added structure can be effectively reduced while the structural strength is guaranteed. The PVC pipe is applied to the maintenance and reinforcement engineering of the concrete bridge floor, the construction period of bridge floor maintenance is shortened while the cost is reduced, and the service life of a bridge is prolonged.

The invention provides a high-precision calculation method for weighing a farm feed tower under a wind load condition, and belongs to the technical field of weight calculation methods. The method specifically comprises the following steps that the dead weight of a feed tower, the total weight after feed is added and the static supporting force of each supporting leg are determined; the wind direction is measured, and the supporting legs are divided into a windward group and a leeward group according to the vertical symmetry plane, perpendicular to the wind direction, of the center of the material tower; respectively calculating the vertical distance from each supporting leg of the windward group and the leeward group to the symmetry plane, calculating the wind load force and the upsetting moment by combining the wind speed to establish a supporting leg counter-force mathematical model under the wind load, and obtaining the dynamic supporting force of each supporting leg; superposing the static supporting force and the dynamic supporting force of each supporting leg to obtain an estimated supporting force of each supporting leg; the estimated supporting force of each supporting leg under the wind load and the supporting force, measured in real time, of each supporting leg are used for conducting filtering calculation to obtain accurate dynamic supporting force of the wind load; and deducting the accurate wind load dynamic supporting force and the dead weight of the feed tower to obtain the actual accurate weight of the feed.