188 results about "Straight segment" patented technology

The invention provides an internal thread and a threaded connection pair, and belongs to the technical field of threaded connection. The internal thread is a meter-made thread or an MJ thread, a thread profile line of the internal thread comprises a thread top, a straight line section, a thread bottom and a straight line section which are connected in sequence, the thread angle of the internal thread is 60 degrees, the thread pitch is P, the width of the thread top is defined as Cn, the width of the thread bottom is defined as Cn2, the thread height is defined as hn, Cn is larger than 0 and smaller than C0, # imgabs0 #, and C0 is the width of the thread top of the standard meter-made internal thread or the MJ internal thread. The tooth thickness of the internal thread teeth is reduced, the rigidity of the internal thread teeth can be reduced, the bending deflection of the internal thread teeth can be improved, and therefore when the thread connection pair bears alternating loads, the internal thread teeth can generate larger bending deformation to absorb inertia force generated by the alternating loads, and therefore the thread connection pair can bear the alternating loads. Therefore, the stress of the root of the external thread under the action of the alternating load is reduced, and the fatigue performance of the external thread is improved.

The invention relates to a variable anvil width type forging device and a variable anvil width type forging method, belongs to the technical field of forging of forge pieces, and solves the problems that in the prior art, after drawing-out, a lap joint between anvils on the surface of a shaft body of a forging stock is serious in crease, the surface quality is poor, and finally the compaction effect is poor. The variable anvil width type forging device comprises an upper convex anvil and a lower platform, the lower edge of the upper convex anvil comprises a horizontal section and first straight line sections which are arranged at the two ends of the horizontal section and incline upwards, an included angle is formed between the horizontal section and the first straight line sections, and the horizontal section and the first straight line sections are in transition connection through fillets; and the side edge of the upper convex anvil is a second straight line section inclined towards the anvil main body, an included angle is formed between the second straight line section and the vertical direction, and the second straight line section is in transition connection with the first straight line section through a fillet. The compaction effect of the core of the forging stock can be improved, and surface creases of the forging stock can be reduced.

The invention belongs to the technical field of reservoir dam line design, and provides an automatic determining method and system for a dam site of a whole-reservoir anti-seepage pumped storage reservoir. The method comprises the following steps: S1, extracting a contour line of a terrain curved surface corresponding to the elevation of a hydropower station; s2, selecting a contour line with the largest enclosed area range; s3, generating a convex hull for the selected contour line; s4, poles of the convex hulls are connected into a plurality of straight line sections li, the poles cut off the contour line into a plurality of curved line sections pli, and i closed areas are defined by the straight line sections li and the curved line sections pli; s5, selecting a closed area of which the volume is greater than a preset value V; s6, traversing a point j on the curve segment pli, drawing a vertical line nj from the point j to the straight line segment li, calculating the length hj of the vertical line nj, obtaining the length hijmax of the longest vertical line of each closed area, and calculating the ratio k of the hijmax to the straight line segment li; s7, setting a threshold value a, and selecting kgt; a closed area of a is used as a selected dam address. The method can accurately select sites, reduces man-made interference, and is suitable for various terrain environments.

The invention discloses a super-large broken line glass curtain wall installation method which comprises the following steps: based on curtain wall design parameters, obtaining deformation trends of a curtain wall in different installation stages, and based on the deformation trends, respectively determining deformation control thresholds of a straight line section component and a broken line node component of the curtain wall; adjustable hydraulic supporting tools are arranged in the installation area of the linear segment component and the installation area of the broken line node component respectively, and the adjustable hydraulic supporting tools are used for supporting glass plates of the linear segment component and the broken line node component; and staged installation is carried out according to the time sequence that the linear segment components are installed firstly and then the broken line node components are installed. Deformation trends of different installation stages are obtained in advance based on curtain wall design parameters, differentiated deformation control threshold values are set for the straight line section component and the broken line node component, and refined control over the rigidity sudden change area at the broken line node is achieved; the adjustable hydraulic supporting tool is arranged, and the supporting force is dynamically adjusted through the hydraulic rod.

A method embedded in an ego motor vehicle determines the visibility of a point of interest. The method includes positioning the point of interest, the remaining planned route, and the coordinates of the current location of the vehicle in the three-dimensional map, representing the point of interest by a polygon having at least three vertices of given coordinates in three dimensions, representing, via an open broken line, the remaining planned route, by interconnecting points of change in orientation of the remaining planned route, tracing straight line segments having as first end points on the broken line, and as second end points on the polygon, determining the visibility of the point of interest from the first end of the segment, and determining an optimal visibility window.

The utility model discloses a tunnel combined type lining grating steel frame structure which comprises a plurality of first sections and two second sections, the arc-shaped first sections are sequentially connected end to end through first connectors to form an arch structure, and the two second sections are symmetrically arranged. The upper ends of the second sections are connected with the two ends of the arch structure through first connectors, and the lower ends of the two second sections are connected with second connectors. Wherein the central angle opposite to the first section is 30 degrees; the second section is composed of an arc-shaped section and a linear section, the upper end of the arc-shaped section is connected with the first connector, and the lower end of the arc-shaped section is connected with the second connector through the linear section. The construction mode that field assembly is carried out after prefabrication is adopted, the field construction difficulty is effectively reduced, and the construction efficiency is improved.

The invention discloses an automatic detection device and method for top adjustment of turnout rails, and belongs to the technical field of turnout processing. The method comprises: after each top adjustment, three coordinate values ​​at the top adjustment position are detected by three first laser rangefinders, and the actual vector value is calculated according to the three coordinate values; after all top adjustments are completed, the rail is manually moved toward the straight segment, the starting point of the milling process is located near the initial position of the straight segment detection structure, the starting position is manually marked, the floating lifting structure lifts the rail, the straight segment detection structure moves toward the end point of the straight segment, the first contact displacement sensor detects the starting position and the end point of the straight segment, and obtains the coordinate values ​​of the starting position and the end point of the straight segment; at the same time, the curve segment detection structure moves toward the end point of the curve segment, the second contact displacement sensor detects the predetermined position and the end point, and obtains the coordinate values ​​of the predetermined position and the end point of the curve segment; the support deviation value of the corresponding position is obtained according to the detection result.

A cable handling bow (2) for an overboarding system of a work platform is proposed, wherein the cable handling bow (2) comprises a cable retaining structure (4) for retaining a length of a cable, wherein the cable retaining structure (4) extends along a partially curved path (6), which path (6) has a first end (8) and an opposed second end (10), wherein the path (6) has a first straight segment (14) located between the first end (8) and the second end (10) and being spaced away from both ends (8, 10), such that a cable joint connecting two ends of a cable is placeable in the first straight segment (14), when the cable length is retained in the cable retaining structure (4).

The invention discloses a screw taking-out device and a using method thereof, and belongs to the technical field of aeronautical manufacturing and maintenance, the screw taking-out device comprises a sleeve, a locking ring, a cylindrical rolling shaft and the like, the cross section of an inner hole of the sleeve is a similar triangle formed by connecting three linear sections and three arc sections at intervals, and the locking ring is provided with three strip-shaped cylindrical rolling grooves; and the cylindrical rolling shaft and the cylindrical rolling groove are combined and then are placed and limited in the inner hole of the sleeve. During use, the screw rod is inserted among the three cylindrical rolling shafts in the locking ring, the outer sides of the cylindrical rolling shafts are adjacent to the arc section of the inner hole in a non-extrusion state, the sleeve is rotated, the cylindrical rolling shafts slide to the linear section of the inner hole under the friction force action of threads of the screw rod, the screw rod is clamped by the cylindrical rolling shafts, and the sleeve is continuously rotated to screw out the screw rod. According to the screw disassembling device, when the screw is disassembled, torque applied to the screw acts on the axis of the screw, the screw is prevented from being broken in the rotating and taking-out process, and the disassembling work efficiency is not affected while the quality of a product fastened by a bolt is guaranteed.

The invention provides an arc thread double-end bolt assembly and a combined nut, and belongs to the technical field of bolt connection. The arc thread double-end bolt assembly comprises a double-end bolt, an embedded nut and a fastening nut, thread forms of external threads at the two ends of the double-end bolt comprise an outer thread top, a thread side linear section, a thread bottom arc and a thread side linear section which are sequentially connected, and the thread form angles of the external threads are all 60 degrees. The thread forms of the internal threads of the embedded nut and the fastening nut comprise a thread bottom arc, a thread side linear section, a thread top linear section and a thread side linear section which are connected in sequence, the thread form angle of the internal threads of the fastening nut is beta j, the thread form angle of the internal threads of the embedded nut is beta m, beta j is larger than beta m, and beta m is smaller than 60 degrees. The fatigue performance of the external threads at the two ends of the double-end bolt is different, the fatigue performance of the position, matched with the embedded nut, of the double-end bolt is better than that of the position, matched with the fastening nut, of the double-end bolt, when the double-end bolt is subjected to fatigue fracture, the fracture position is located at the position of the fastening nut more easily, and therefore the double-end bolt can be detached from a structural body conveniently, and on-site replacement operation is facilitated.

The utility model provides a sliding block component of a buffering sliding door and a buffering device, and is applied to the technical field of buffering sliding doors, the sliding block component is arranged in a sliding groove of a buffering frame in a sliding mode and connected with a buffering component, the sliding groove comprises a linear section and an arc section, and the sliding block component slides and rotates in the linear section and the arc section; and a connecting part is arranged at the rotating center, rotating in the arc section, of the sliding block part and used for being hinged to the buffering part, so that the buffering sliding door has the beneficial effects of being stable in structure and not prone to deformation.

1. The name of the design product: the side surface of a uniaxial robot. 2. The use of the design product: the uniaxial robot is used for automation equipment, and the side surface of the uniaxial robot serves as one side of the uniaxial robot. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view. 5. Other circumstances that need to be explained: the main protection of the design product is the partial design of the uniaxial robot. The gray part is the part claimed by the partial design, and the claimed design does not include the gray color, but includes the straight line segment green color arranged on the gray part. The blue part is the part not claimed by the partial design.

The application relates to the technical field of motion planning, and discloses a corner fairing method of an asymmetric Airthoid-arc, which comprises the following steps: constructing a tool path fairing curve which is sequentially connected by a first Airthoid curve, an arc and a second Airthoid curve, and is used for fairing a corner formed by adjacent straight line segments; preliminarily setting a first transition length and a second transition length according to the lengths of the line segments on the two sides of the corner; solving the first and second tangent angles according to geometric constraints, tangential continuity, curvature continuity constraints and position continuity constraints; if there is a solution, analytically calculating a current approximate error; and finally analytically calculating the curvature extreme value and the arc length of the fairing curve. The asymmetric curve structure is adopted, the corner space is fully excavated, the curvature extreme value is small, the arc length can be analytically expressed, and the profile error is controllable, so that the numerical control machining efficiency is improved.

The utility model relates to the technical field of chip production, and aims to solve the technical problem that the service life is shortened. In order to solve the technical problem, the utility model provides the diaphragm cylinder with the positioning function. A lower cover is provided with a groove body and a vent hole from top to bottom, and the groove body is communicated with the vent hole; the upper cover is connected to the top of the lower cover, a mounting groove and a sliding groove are formed in the bottom of the upper cover from bottom to top, and the mounting groove communicates with the sliding groove; the top wall of the mounting groove is sunken upwards to form a first groove hole, and a positioning pin is mounted in the first groove hole; the positioning pin is provided with a lower half part extending into the mounting groove, and the lower half part comprises a linear section and a conical section from top to bottom; a piston body of the piston is matched with the mounting groove; the guide part is matched with the sliding groove; a positioning pin hole is formed in the top of the piston body, the lower half part is located in the positioning pin hole, and the linear section is matched with the positioning pin hole and used for achieving positioning. And the diaphragm is hermetically connected between the lower cover and the upper cover. According to the utility model, the service life is prolonged.

An inner curve type PPU robot is characterized by: further comprising a support block, the support block being disposed inside three support bearings, and an oscillating contour surface being formed on the outer side of the support block, the oscillating contour surface comprising two symmetrically arranged C-shaped contour surfaces, the C-shaped contour surface comprising an arc segment and straight segments at both ends of the arc segment, and the distance of the arc segment from the rotation center of the main shaft being greater than the distance of the straight segments from the rotation center of the main shaft; when the oscillating wheel moves, the three support bearings and the oscillating contour surface are always in contact to form a rolling fit, and the oscillating wheel drives the linkage shaft to move along the C-shaped trajectory. Its advantages are: 1. The support block is set inside the three support bearings. Compared with the cycloidal frame in the prior art, the outer curved surface is changed to the inner curved surface, making the structure more compact and reasonable, and greatly reducing the volume; 2. The C-shaped contour surface includes an arc segment and two straight segments. Compared with the rounded square trajectory in the prior art, the movement of the swing wheel will be more continuous; 3. The support bearing has a higher speed and greater torque when passing through the straight segment, which reduces the influence of gravity and makes the movement more stable. The support bearing has a lower speed and faster speed when passing through the arc segment, which increases the running speed and makes the movement more rapid.

The present invention provides a Ribas rope groove positioning device, which includes a straight-line segment guiding component and an inclined-line segment guiding component. The straight-line segment guiding component includes a first connecting plate and a first fixing member. A plurality of first guiding grooves are provided at the bottom of the first connecting plate. The first guiding grooves match the straight-line segment round steel, and the center line of the first guiding grooves is parallel to the tangent of the drum. The first fixing member is used to connect both ends of the first connecting plate to the drum wall; the inclined-line segment guiding component includes a second connecting plate and a second fixing member. A plurality of second guiding grooves are provided at the bottom of the second connecting plate. The second guiding grooves match the inclined-line segment round steel, and the included angle between the center line of the second guiding grooves and the tangent of the drum is an acute angle. The Ribas rope groove positioning device according to the embodiment of the present invention has a simple structure, is convenient for disassembly and assembly, reduces the positioning difficulty of the straight-line segment round steel and the inclined-line segment round steel, and further improves the Ribas rope groove positioning accuracy.

The present application relates to the technical field of numerical control machining.A three-axis linkage operation method capable of self-adapting to realize arbitrary orientation movement includes the following steps: the whole process is virtually three straight line movements: ABE, EF and FCD, and the velocities, accelerations and the like of each endpoint A, E, F and D are all 0, the BE segment is pure deceleration movement, FC is pure acceleration movement, and they perform superimposed movement with EF in different time periods, so that the intermediate "frogs' leap" curve is obtained AB +t EF +t CD . Wherein A, B, C and D are four fixed points initially set according to machining requirements, A and D are respectively start and end points, AB and CD are respectively linear segments with limited trajectories, and E and F are respectively points on the extension lines of the linear segments AB and DC. The technical scheme of the present application realizes the shortest whole process movement time of the movement target, has no large corner in the movement process, has no frequent deceleration processing, and has short operation time.

The application relates to the technical field of cutting tools, in particular to a cutting blade and a cutting tool. The cutting blade comprises a central shank and a cutting head; the cutting head comprises a rake face, a relief face, a bottom face and a chip breaking structure located on the rake face; a cutting edge formed by the rake face and the relief face comprises two edge straight line segments formed by a first rake face and the relief face, two first edge circular arc segments formed by a first circular arc transition face and the relief face and a second edge circular arc segment formed by a second rake face and the relief face; when viewed along the length direction of the central shank towards the relief face, the middle part of the second edge circular arc segment is concave downwards, and the two sides are connected to the edge straight line segments upwards through the first edge circular arc segments. The cutting edge of the application is concave in the overall shape, effectively reduces the cutting resistance during cutting processing, thereby inhibiting the vibration between the cutting edge and the workpiece and improving the machining precision. The cutting blade has certain edge strength while ensuring the sharpness of the edge.

A staple includes a crown section including a first curve, a second curve, a third curve, a first straight segment extending between the first curve and the second curve, and a second straight segment extending between the first curve and the third curve. The second curve and the third curve define, respectively, opposite ends of the crown section. The staple includes a pair of leg sections extending from the opposite ends of the crown section.

The invention discloses a small-size sealing tooth machining tool, a design method and a machining method, and belongs to the technical field of tool design, the sealing tooth machining tool comprises a tool body and a blade, the length of the tool body is larger than the height H of a sealing tooth, and the side face angle of the tool body is larger than the tooth side angle C; the cutting edge is an arc cutting edge arranged at the lower end of the cutter body, and the radius of the cutting edge is a transition fillet R of the tooth side and the tooth bottom of the sealing tooth; the length m of a straight section between arcs of the cutting edge is determined according to the length of a straight section M at the bottom of the sealing tooth; when the length of the straight line section M at the bottom of the sealing tooth is less than 0.5 mm, the cutting edge is a spherical cutting edge; when the length of the bottom straight line section M of the sealing tooth is larger than 0.5 mm, the length m of the straight line section between the arcs of the cutting edge is M-0.5 mm; the cutter effectively solves the technical problem of blade breakage caused by insufficient cutter strength in the machining process of a traditional cutter through multi-dimensional innovative design, and has high use value and popularization value.

The present invention discloses a method for constructing a segmental box girder with a small curve and a large transverse slope, comprising: step one, construction of a segmental box girder with a straight line; step two, installation of a bracket beside a pier, wherein the plane thereof is installed by adjusting and matching with the legs of a bridge erecting machine, and the temporary support is anchored to the legs of the bridge erecting machine through an anchoring system; step three, the bridge erecting machine rotates across the span, a transverse shifting device is provided on the main beam of the bridge erecting machine for transversely shifting the middle legs to the designed position, and an adjusting pad is provided during the movement of the rear legs to adapt to the change of the transverse slope of the segmental box girder; step four, suspension of the segmental box girder, feeding the beam in different ways according to the design at different positions, and the box girder is adjusted and assembled; step five, permanent prestressing; step six, repeating the above steps. The present invention optimizes the anchoring system of the bridge erecting machine, reduces the front-end process of the bridge erecting machine, adapts to the change of the transverse slope of the rear legs, avoids endangering the safety of the rear legs, and the transverse shifting device of the middle legs of the bridge erecting machine avoids the use of a large crane, saves costs, reinforces the existing curved bridge, and facilitates beam feeding.

The invention discloses an overturning tool assembly and method for ultra-large disc parts. The turnover tool assembly comprises a turnover transfer tool, a transfer hook and a temporary storage part; the turnover transfer tool comprises a bottom plate, the bottom plate is provided with a fixing assembly used for fixing parts from the middle and / or the edge, the periphery of the bottom plate is provided with a plurality of supporting legs, the supporting legs are located on the hoisting side and the turnover side respectively, the supporting legs on the hoisting side are provided with hanging rings, the supporting legs on the turnover side are provided with arc-shaped edges facing the turnover side, and the arc-shaped edges face the periphery of the bottom plate. And a linear section is arranged in the middle of the arc-shaped edge and is perpendicular to the bottom plate. The problems that parts are difficult to fix and blades are prone to deformation are solved, and damage to the blades by external force is avoided through accurate positioning and stable clamping; the overturning resistance is reduced through the overturning side arc-shaped supporting legs, the gravity center in the overturning process is effectively balanced in cooperation with the reasonable position design of the hoisting side lifting ring, and the potential safety hazard that inertia instant overturning or manual intervention is needed due to gravity center shifting is avoided.

The utility model discloses a space avoidance hinge in the hardware technical field, including door frame, door board and hinge module, the door board is assembled in the door frame inside through the hinge module with axial connection mode, the hinge module contains mirror image symmetry's upper hinge group, lower hinge group, in the upper hinge group, the integrative first upper hinge processes the inside, outside limit guide rail that is parallel to each other, and two movable bearings of second upper hinge installation are accurate adaptation with it, and the bottom of door frame is equipped with the adaptation sink groove, and forms double positioning with the outside limit guide rail, through such structural design, can firm connection door board and door frame and accurate guidance door board movement, when door board opening, first along the guide rail straight line section smooth translation, and then along the arc segment smooth rotation to 90 degrees, make door board thickness completely hide, this design not only has promoted the space utilization, also satisfies the strict requirement of high sealing place, has improved the defect of traditional hinge in space utilization and sealing performance greatly.

The present application relates to the technical field of sealing strip rubber sleeve conveying, and discloses a sealing strip rubber sleeve conveying device and a conveying method, the conveying device comprising: a rubber sleeve conveying belt, the rubber sleeve conveying belt comprising: a plurality of straight line segments, in polygonal distribution. The present application places a plurality of rubber sleeves on the first straight line segment in sequence, so that the plurality of rubber sleeves are conveyed along the plurality of straight line segments and the plurality of arc-shaped segments, and finally the plurality of rubber sleeves are arranged on the plurality of straight line segments respectively; since the plurality of straight line segments and the plurality of arc-shaped segments form a rotary structure, the corners of the plurality of rubber sleeves can be all directed towards the center of the rotary structure. The rotary structure can change the direction of the corners of the rubber sleeves, and no additional reversing line body is needed; the conveying device is highly integrated, occupies a small area, and greatly reduces the investment cost required by the device.

The invention relates to the technical field of metal processing and mechanical manufacturing, and discloses a pipe cutting device for frame production, which comprises a table top, a support rod I, a support rod II, a cutting knife, a reciprocating transportation mechanism and a rotary cutting mechanism, and is characterized in that the reciprocating transportation mechanism is arranged to synthesize composite motion with a specific time sequence, so that the cutting efficiency is improved; horizontal feeding and vertical jacking and falling actions are fused in a compact cycle; when the small gear rolls along the straight line section of the circular gear column, accurate horizontal pushing of the pipe material is achieved, and the accuracy of fixed-length feeding is ensured; when moving to the arc-shaped sections at the two ends of the special-shaped sliding groove, the combined gear mechanism triggers the vertical displacement of the whole combined gear mechanism, the upper supporting plate is jacked up or put down through the long rod, grabbing and releasing of pipes are completed, an independent lifting driving element can be omitted, and more importantly, strict synchronism and high repeated positioning accuracy of the feeding process and the cutting action are guaranteed; and the cutting length error and the equipment clamping stagnation risk caused by unstable feeding are fundamentally overcome.

The application relates to a high-continuity appearance surface processing technology and device, and belongs to the technical field of surface processing, and comprises the following contents: S1: curvature distribution data of a charging port cover edge is acquired in real time through three-dimensional laser scanning, and a partition geometry model containing a straight line segment, a small fillet segment and a large fillet segment is established; S2: based on the curvature distribution data, polishing assembly is adjusted to adaptively adjust polishing areas of the straight line segment, the small fillet segment and the large fillet; S3: based on the partition geometry model, the polishing assembly is adjusted to polish the straight line segment, the small fillet segment and the large fillet segment in sequence, through a curvature-adaptive dynamic processing system, a technical bottleneck of traditional fixed-parameter polishing is broken, high precision of a complex curvature surface is realized, and the high-continuity appearance surface requirement of the charging port cover can be guaranteed.

The invention aims to provide an axisymmetric judgment method for discrete data points of a complex outer contour curve. The axisymmetric judgment method comprises the following steps: A, measuring by using a three-coordinate measuring instrument to obtain the discrete data points of the outer contour of a stamping sample piece; b, all discrete data points on each section of curve are regarded as a set and recorded as PI, each data point is represented by pIi (xi, yi), I and i represent the I curve and the i discrete data point respectively, and the initial sequence number is 1; c, for the set PI of each curve discrete point, finding out the longest straight line segment, and calculating the slope of the longest straight line segment; d, for the set PI of each curve discrete point, calculating a symmetry axis equation: Ax + By + C = 0; and F, judging each discrete point in each curve based on a symmetry axis equation, and determining whether the curve is axisymmetric or non-axisymmetric. The method can quickly judge whether the discrete curve shows the axial symmetry characteristic or not so as to quickly complete the mold design of a complex profile curve.

The invention provides an arc threaded connection pair, and belongs to the technical field of threaded connection. The arc thread connection pair comprises an external thread and an internal thread which are both arc threads, and the thread form of the external thread comprises an external thread crest arc, an external thread flank linear section, an external thread root arc and an external thread flank linear section which are connected in sequence. The tooth form of the internal thread comprises an internal thread root arc, an internal thread flank linear section, a transition arc and an internal thread crest linear section which are connected in sequence, and the transition arc is tangent to the external thread root arc. The contact point of the internal thread and the external thread is closer to the tooth bottom of the external thread, and the equivalent force arm between the contact point and the tooth bottom of the external thread is shorter, so that the torque borne by the tooth of the external thread is reduced, the opening effect of the tooth of the internal thread on the tooth of the external thread can be weakened, the stress concentration of the tooth bottom of the external thread is reduced, and the fatigue performance of the external thread is improved.

The invention provides an aqueduct construction method. The aqueduct construction method comprises the following steps that S1, an aqueduct is divided into a straight line section and a curve section; s2, calculating a central angle alpha of the second groove body; s3, dividing the straight line segment into a first straight line segment and a second straight line segment; a prefabricated groove field is built on the first straight line section; s4, supports are installed at the tops of the cushion blocks of the two adjacent pier columns, then a groove body left end mold, a groove body right end mold and a groove body mold plate of a first groove body are installed, prefabrication of the first groove body is conducted, and all prefabrication of the first groove body and assembly construction of a second straight line section are completed; s5, clockwise rotating the left end mold of the groove body by 0.5 alpha, anticlockwise rotating the right end mold by 0.5 alpha, adaptively moving and adjusting top supports of two adjacent pier columns in the longitudinal groove direction, mounting a groove body mold plate of a second groove body, and then completely prefabricating the second groove body and assembling and constructing a curved section; and S6, assembling construction of the first straight line section is completed. The construction efficiency of aqueduct construction is improved.

According to the long-term storage transverse folding and unfolding rudder sheet mechanism and the unfolding method, the design of the transverse folding and unfolding rudder sheet mechanism is provided, transverse initial stable locking of a rudder sheet is achieved through a front linear section of a cam, unfolding of the rudder sheet is achieved through an actuator cylinder, a push rod, a cam curve and the rudder sheet, and locking of the tail position of the rudder sheet is achieved through a rear linear section of the cam after the rudder sheet is in place; the long-term storage reliability is guaranteed by taking gunpowder as driving energy, and the flight process is stable and reliable by the mechanism. The structure is simple and reliable, and implementation is convenient.