1673 results about "Stringer" patented technology

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

The invention discloses a centering and positioning mechanism of an automobile stamping part welding fixture, and relates to the technical field of automobile production. The centering and positioning mechanism of the automobile stamping part welding clamp comprises a supporting frame, a double-station alternate conveying assembly is arranged on the supporting frame, and two symmetrically-distributed turnover devices are arranged on the double-station alternate conveying assembly. A positioning clamping assembly, a clamping adjusting assembly and a driving assembly are arranged in the turnover device. By arranging the driving assembly and the positioning and clamping assembly, the driving assembly drives the two first clamping plates to get close to each other to clamp and position the longitudinal beam while driving the two sliding frames to get close to each other, and in the process, the effect of synchronous clamping and fixing in the longitudinal beam splicing process is achieved; through cooperation of the driving assembly and the positioning and clamping assembly, it can be ensured that the longitudinal beam is kept at the accurate position in the splicing process, and deviation is reduced.

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

The present invention relates to a long-string flipping tool for aircraft wall panel structures and a co-curing molding method, which belong to the field of aviation manufacturing technology. The long-string flipping tool comprises: a flipping platform, provided with: a laying tool limiting device, used for limiting and constraining the long-string laying tool transfer process; a laying tool connecting device, used for connecting and positioning the long-string laying tool on the flipping platform; a laying tool positioning device, used for positioning and constraining the ends of the long-string laying tool on the flipping platform; a wall panel molding tool docking device, used for docking and positioning between the flipping platform and the wall panel molding tool after the flipping platform is flipped as a whole; a first / second bracket, provided at both ends of the flipping platform, respectively connected to the flipping platform through a bracket connecting device. The long-string flipping tool and the matching positioning device have the characteristics of simple structure and easy operation, and can meet the requirements of process stability and production efficiency in the co-curing molding process of aircraft wall panel parts.

The invention relates to the technical field of composite material stringer forming, and particularly discloses a composite material stringer forming mold and method.The composite material stringer forming mold comprises a mold pressing machine, a jacking cavity, a clamping cavity, a positioning mechanism, a mold pressing mechanism and a jacking mechanism, and the jacking cavity is formed in the bottom end of an inner cavity of the mold pressing machine; clamping cavities communicated with an inner cavity of the molding press are formed in the left side and the right side of the molding press, the positioning mechanisms are arranged in inner cavities of the clamping cavities, the molding mechanism is arranged at the top end of the inner cavity of the molding press, and the jacking mechanism is arranged in an inner cavity of the jacking cavity. The device can effectively overcome the defects of edge fiber distortion and interlayer slippage caused by resin flow and thermal expansion coefficient difference in the prior art, can ensure that the prepreg is kept at a design angle when being laid, can timely identify and adjust an abnormal stress state during demolding, greatly reduces the rejection rate, and improves the production efficiency. The mold system can realize accurate control of the hot press molding process and safety protection of the demolding process, and has remarkable economic benefits and application values.

The invention discloses a trapezoidal sleeper system with a preassembled limiting frame and a construction method thereof.The system comprises a novel trapezoidal sleeper and the preassembled limiting frame, the preassembled limiting frame is formed by prefabricating reinforced concrete, and the novel trapezoidal sleeper cancels a traditional limiting boss and a buffer pad pasted to the outer side of an original limiting boss and the outer side of a longitudinal beam; left and right outer side blocking shoulders of the ballast bed are correspondingly canceled; the connecting steel pipes are wrapped with concrete blocks, and buffering pads are pasted on the concrete blocks and the inner sides of the adjacent longitudinal beams. The prefabricated limiting frames are located at the ends of the trapezoidal sleepers, specifically located on the inner sides of the two longitudinal beams and also located between the outer wrapped concrete cross beams of the two trapezoidal sleepers, and therefore the novel trapezoidal sleepers are limited through the prefabricated limiting frames. In the construction process, the limiting frames and the trapezoidal sleepers are pre-assembled into a whole, the limiting frames have the mold effect during cast-in-place, concrete is cast in the limiting frames at the ends of the trapezoidal sleepers, the limiting frames and the ballast bed are cast into a whole, and the limiting piers are formed.

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

The present application provides a co-bonding manufacturing method for a hyperbolic hat-stringer stiffened panel, comprising: arranging multiple magnets at intervals on a release cloth to form a flexible magnet series strip; inserting the flexible magnet series strip into a tubular vacuum bag, and then laying the tubular vacuum bag in a cavity of a hyperbolic hat-stringer; at positions corresponding to the positions of multiple magnets in the flexible magnet series strip, mounting multiple magnets on the outer surface of the top of a protruding portion of the hyperbolic hat-stringer, and enabling the magnets and corresponding magnets in the flexible magnet series strip to be respectively and mutually attracted with each other; changing the positions of the magnets to adjust the shape of the tubular vacuum bag in the cavity, such that the tubular vacuum bag uniformly conforms to the shape of the cavity of the hyperbolic hat-stringer; and after a co-bonding operation is completed, removing the magnets mounted on the outer surface of the top, and then pulling out the flexible magnet series strip from the inner cavity of the tubular vacuum bag.

The invention provides a stirrup temporary storage frame and an adjusting device, and belongs to the technical field of steel reinforcement framework machining devices.The stirrup temporary storage frame comprises a supporting bottom frame, the supporting bottom frame is provided with at least two supporting longitudinal beams which are oppositely arranged in parallel, and a connecting cross beam is arranged between any two adjacent supporting longitudinal beams; u-shaped limiting structures are evenly arranged on the tops of at least two supporting longitudinal beams at intervals in the length extending direction, the U-shaped limiting structures on each supporting longitudinal beam and the U-shaped limiting structures on the adjacent supporting longitudinal beam are oppositely arranged, and each set of opposite U-shaped limiting structures are used for containing one stirrup. A clamping structure for clamping the stirrup is arranged in the U-shaped limiting structure, so that the stirrup is stably placed in the U-shaped limiting structure; the temporary storage, adjustment and transportation efficiency of the stirrups in the machining process of the rectangular steel reinforcement framework can be remarkably improved, the machining precision is improved, the production cost is reduced, and the temporary storage, adjustment and transportation device has wide application prospects and popularization value in the field of machining of building steel reinforcement frameworks.

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

The invention discloses a fabricated concrete industrial factory building structure, and relates to the technical field of industrial factory buildings. The assembly type concrete industrial factory building structure comprises a plurality of layers of laminates, the laminates are connected and supported through prefabricated concrete stand columns, each layer of laminate comprises a frame built through a concrete steel structure and a pavement structure laid on the top of the frame, and the frame comprises concrete cross beams, concrete longitudinal beams and concrete secondary beams. The concrete cross beams, the concrete longitudinal beams and the prefabricated concrete stand columns are perpendicularly connected through the main nodes. Concrete and I-shaped steel are combined and poured into a firmer beam column, stable installation and connection can be achieved only by using main joints and secondary joints to be matched with bolts at the connecting positions of all the parts, then a small amount of welding is conducted, more stability is achieved, the construction efficiency is high, follow-up dismantling work can be conveniently conducted, and the top surface layer is spliced through non-rib-out laminated plates, so that the construction cost is reduced. And then the concrete pavement is paved, so that the construction is relatively simple and rapid.

The present disclosure relates to orthogrid stiffened structures. The present disclosure envisages a variable orthogrid stiffened shell (100). The shell (100) comprises at least one face sheet (102), a plurality of stringers (104) and a plurality of rings (106) attached to the face sheet (102). The stringers (104) are attached parallel to each other. The rings (106) are attached to the face sheet (102) across the stringers (104) to form an orthogrid array (110) on the face sheet (102). The dimensions of thickness and height of the stringers (104) vary from the dimensions of thickness and height of the rings (106).

The utility model relates to the technical field of building structures, and discloses a node of a steel reinforced concrete column and a reinforced concrete beam, which comprises a longitudinal beam, a cross beam and a section steel column body with a built-in section steel body, the longitudinal beam, the cross beam and the section steel column body are perpendicular to each other and intersect at the node, and the longitudinal beam comprises a first longitudinal bar and a second longitudinal bar which are parallel to each other. The first longitudinal bars penetrate through the profile steel body in the full length direction, and the second longitudinal bars are connected to the two sides of the profile steel body through longitudinal sleeves. The cross beam comprises a first transverse longitudinal bar and a second transverse longitudinal bar, the second transverse longitudinal bar is connected with the profile steel body through a transverse sleeve, and the first transverse longitudinal bar is horizontally bent to the outer side of the profile steel body and is arranged in a full-length mode; the joint does not need a field welding process, the arrangement requirement of large-density multi-layer longitudinal bars can be met while the bearing capacity of the section steel can be guaranteed through the structure, internal force of the joint can be effectively transmitted into the section steel column, force transmission is clear, construction is easy and convenient, and the construction progress is accelerated.

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

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

The invention belongs to the field of airplane structure strength tests, and relates to an adjustable composite material single rib plate bending loading pressure head. The loading pressure head comprises a pressure head support (2), a wedge-shaped cushion block (3), a skin pressure roller (5) and a stringer pressure roller (7), the pressure head support (2) is provided with a stand column (21) and a track plate (22), the side edge, above the track plate (22), of the stand column (21) is provided with a notch for installing the wedge-shaped cushion block (3), the skin pressure roller (5) and the stringer pressure roller (7) are arranged in a containing groove of the track plate, and the skin pressure roller (5) penetrates through the track plate and then makes contact with the wedge-shaped cushion block (3). According to the application, the stringer flanges on the two sides of the web and the skin are separately pressed, so that accurate loading of bending pressure on the single rib plate with the stringer flanges and the skin inconsistent in thickness is realized.

The embodiment of the utility model provides a concrete lining formwork trolley which comprises a formwork, a moving device and a portal frame, the portal frame is connected with the formwork and the moving device, the portal frame is composed of a portal frame assembly, and the portal frame assembly comprises a lower longitudinal beam, a stand column, an upper longitudinal beam, a horizontal support, an inclined support and a diagonal draw bar. The stand column is fixedly connected with the lower longitudinal beam and the upper longitudinal beam, the horizontal support is fixedly connected to the upper longitudinal beam, the inclined support is fixedly connected with the lower longitudinal beam and the horizontal support, and the inclined pull rod is fixedly connected with the lower longitudinal beam and the stand column. Therefore, according to the lining formwork trolley provided by the embodiment of the utility model, the weight of the lining formwork trolley can be reduced while the strength is ensured.

The invention belongs to the technical field of welding, particularly relates to a wind turbine generator cabin longitudinal beam welding-on tool, and aims to solve the problems that an existing welding-on tool is single in longitudinal beam fixing and supporting mode and poor in fixing effect, a longitudinal beam can expand and deform in the welding-on process and does not have compensation and reset effects, and the welding-on effect is affected. Four supporting legs are mounted at the bottom of the working plate, and two welding supporting plates are symmetrically mounted at the top of the working plate in a sliding manner; the two movable clamping mechanisms are mounted at the tops of the two welding supporting plates in a sliding manner; and the two moving control mechanisms are mounted at the tops of the two welding supporting plates and connected with the two moving clamping mechanisms. The longitudinal beam fixing effect is improved through the electromagnet and mechanical clamping composite design, stress is absorbed through hydraulic energy storage during welding thermal deformation through the buffer hydraulic cylinder and the eccentric wheel linkage design, automatic reset is achieved after cooling, material deformation is effectively compensated, and welding defects are reduced.

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

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

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

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

The invention discloses welding deformation preventing equipment and method for steel-concrete composite bridge manufacturing, and relates to the technical field of steel-concrete composite bridge welding manufacturing, the welding deformation preventing equipment comprises a working frame, supporting columns, short transverse plates and long transverse plates, heat preservation assemblies are symmetrically arranged at the top of the working frame, and the heat preservation assemblies continuously preserve heat for a cross beam when the cross beam is welded with a plurality of longitudinal beams; and the heat preservation assembly comprises a heat preservation box, a heating pipe and a vertical rod, and a material receiving plate is fixedly arranged on the right side face of the working frame. The two heat preservation assemblies are symmetrically arranged on the top of the workbench. According to the heat preservation assembly, the temperature uniformity of a welding area and an adjacent area is maintained, the welding cooling rate difference is reduced, the tensile stress generated due to local rapid shrinkage and the pressure stress caused by subsequent welding extrusion are reduced, and the thermal stress gradient can be remarkably reduced through constant-temperature control; and accumulated deformation caused by repeated expansion and shrinkage inconsistency of the cross beam in the welding process is restrained.

The embodiment of the invention provides a floor and a double-layer railway vehicle, the floor comprises a plurality of longitudinally arranged floor modules, each floor module comprises an upper-layer skin, a lower-layer skin and a middle-layer frame, and each middle-layer frame comprises an internal reinforcing beam and an edge sealing beam; the internal reinforcing beam comprises a plurality of cross beams and longitudinal beams which are staggered transversely and longitudinally, the cross beams and the longitudinal beams form a filling part, a foam sandwich layer and / or a carbon fiber tube core material group and a carbon fiber composite material are arranged in the filling part to realize the lightweight design of the floor, and meanwhile, the internal reinforcing beam improves the strength and rigidity of the floor and meets the use requirements; a sandwich structure is arranged in the filling part, so that the requirements of light weight and strength are met; secondly, the cross beams and the longitudinal beams at the intersection points are continuously arranged, so that the strength and the rigidity are further improved, the bearing capacity of the floor is enhanced, and the bending resistance is improved; the edge sealing beams achieve connection and sealing between the adjacent modules, and the stability of the whole structure is enhanced.

An assembly type rotatable bridgehead steel transition slab under surface mine heavy traffic comprises H-shaped steel longitudinal beams, transverse partition plates, anti-sliding steel panels, connecting pin shafts, TST elastic plastic bodies, sleeper beams, expansion joint steel plates, steel bridge steel box girders and steel bridge abutment cover beams. The H-shaped steel longitudinal beams are arranged at equal intervals in the transverse bridge direction, the transverse partition plates are arranged in the longitudinal bridge direction, and the anti-sliding steel panel is arranged on the H-shaped steel and connected with the H-shaped steel and the transverse partition plates into a whole. The rotating steel plate is used for connecting the main beam web and the H-shaped steel web of the butt strap, and the rotating pin shaft penetrates through the lug plate to connect the main beam and the butt strap into a whole to achieve the rotating purpose. The TST elastic-plastic body is arranged on a bridge abutment cover beam and below an H-shaped steel longitudinal beam. And the expansion joint steel plate is arranged on the bridge head expansion joint. And the sleeper beam is arranged at the tail part of the steel butt strap. The device can be disassembled, assembled and reused according to the displacement of the steel bridge, and the steel transition slab can rotate, so that the bridgehead roadbed is allowed to generate certain settlement. And when the settlement is too large, backfilling and filling treatment can be carried out.

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

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

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

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